CN111607467A

CN111607467A - Bleaching powder and preparation method thereof

Info

Publication number: CN111607467A
Application number: CN202010535567.4A
Authority: CN
Inventors: 付东青; 杨冬梅; 付东振
Original assignee: Langfang Baimei Biotechnology Co Ltd
Current assignee: Langfang Baimei Biotechnology Co Ltd
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2020-09-01

Abstract

The invention provides a bleaching powder and a preparation method thereof. The bleaching powder comprises the following components in percentage by mass: 3.0 to 20.0 percent of bentonite, 40.0 to 75.0 percent of oxidation bleaching agent, 3.0 to 15.0 percent of bleaching activator, 0.5 to 5.0 percent of chelating agent and the balance of anhydrous sodium sulphate. The color bleaching powder is more stable in the storage process, can perform the functions of decontamination and bleaching on fabrics in the fabric washing process, and can also improve the softness and rewetting performance of the washed fabrics.

Description

Bleaching powder and preparation method thereof

Technical Field

The invention belongs to the field of fabric washing products, and particularly relates to a bleaching powder and a preparation method thereof.

Background

The color bleaching powder is the most commonly used powdery bleaching agent in the laundry industry and is widely used all the time. The color bleaching powder belongs to an oxygen release bleaching agent, and various pigments are destroyed and fabric fibers are bleached through active oxygen released in the using process, so that the purposes of removing stains and increasing the whiteness of the fabric are achieved; meanwhile, the fabric bleaching is mild, and the fabric is not damaged, so that the colored fabric is more beautiful after being washed by the bleaching powder.

The risk that the bleaching powder absorbs water vapor inevitably in the actual production mixing process and the storage process to increase the loss of active oxygen is more obvious in an environment with very high humidity. Under normal temperature conditions, oxidative bleaching agents such as sodium percarbonate, which is most commonly used, are very easily decomposed into sodium carbonate, water and oxygen in the presence of moisture or water, and thus swelling due to release of active oxygen occurs. This decomposition is more pronounced if the storage temperature rises. The decomposition of the oxidizing bleach not only results in the loss of active oxygen, but also results in the caking of the product appearance, thereby affecting the quality and sale of the product. The problem that the oxidation bleaching agent is decomposed due to the fact that the color bleaching powder absorbs a large amount of water vapor in the production process is difficult to solve, and the adoption of an industrial dehumidifier not only consumes time and energy, but also makes the humidity extremely difficult to reach below 40% in most production workshops.

CN107044050A discloses an enzyme-containing color bleaching powder and a preparation method thereof, wherein the composition comprises the following components in percentage by weight: 1.0-3.0% of protease, 0.2-0.5% of cellulase, 2.0-5.0% of lipase, 5.0-10.0% of sodium perborate, 5.0-10.0% of sodium tetraborate, 50.0-80.0% of sodium percarbonate and 1.0-5.0% of sodium bicarbonate. The color bleaching powder containing the enzyme is suitable for stain removal, bleaching and sterilization of colored fabrics and shirts, but the problem of decomposition of an oxidation bleaching agent caused by absorption of a large amount of water vapor in the production process of the color bleaching powder is difficult to solve.

CN105505621A discloses a neutral bleaching powder, which comprises enzyme, color fixative, anti-redeposition agent, bactericide and solid filler, and at least cellulase, the formula of the neutral bleaching powder is mild, the dirt ability is strong, and the neutral bleaching powder can level the hair ball on the surface of clothes and brighten the clothes, however, the neutral bleaching powder can ensure the washed fabric to be more beautiful by adding the color fixative, and the problem of oxidative bleaching agent decomposition caused by water absorption of the bleaching powder also exists.

Therefore, the color bleaching powder is required to be developed at present, not only has good decontamination effect, but also can well solve the problem that the oxidation bleaching agent is easy to decompose after absorbing water.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide the bleaching powder and the preparation method thereof. The oxidation bleaching agent of the color bleaching powder is more stable in the storage process, and the color bleaching powder not only can play a role in decontaminating and bleaching the fabric in the fabric washing process, but also can increase the softness and rewetting performance of the washed fabric.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the invention provides a bleaching powder, which comprises the following components in percentage by mass: 3.0 to 20.0 percent of bentonite, 40.0 to 75.0 percent of oxidation bleaching agent, 3.0 to 15.0 percent of bleaching activator, 0.5 to 5.0 percent of chelating agent and the balance of anhydrous sodium sulphate.

In the invention, the color bleaching powder consists of bentonite, an oxidation bleaching agent, a bleaching activator and a chelating agent in proper proportion. Wherein, the bentonite and the oxidation bleaching agent are matched with each other under a proper proportion to provide high active oxygen and simultaneously avoid the loss of the active oxygen caused by the decomposition of the oxidation bleaching agent due to high temperature or high humidity. The bleaching activator is quickly dissolved in aqueous solution, can generate peroxy acid under the combined action of the bleaching activator and an oxidation bleaching agent at a lower temperature, and the peroxy acid can further enhance the removal effect of the colored impurities on the surface of the fabric. The metal impurities in the color bleaching powder can form chelate through adding the chelating agent, so that the catalytic decomposition of peroxide is reduced.

In the invention, the bentonite is added into the color bleaching powder for the following reasons: first, because bentonite belongs to monoclinic system, unit cellConsisting of two silicon-oxygen tetrahedrons sandwiching an aluminum-oxygen octahedron. Due to octahedral Al therein³⁺And tetrahedral Si⁴⁺The part or the whole of the water is often replaced by other cations, so that the charges in the unit cells are in an unsaturated state, some adsorption and hydrophilic properties are formed, and the drying effect is achieved, thereby effectively solving the problem of the decomposition of the oxidation bleaching agent caused by water absorption in the production or storage process of the color bleaching powder. Secondly, the bentonite is added into the color bleaching powder, so that the friction factor among fabric fibers can be effectively reduced, the fibers can be freely stretched and are not easy to be bonded into a mass, the fabric softening effect is achieved, and the washed clothes have good flexibility. Thirdly, since the bentonite has a structure formed by a plurality of fine and thin nano-scale flaky aluminosilicates, the bentonite is dispersed into a nano-scale lamellar structure during washing, and a small amount of aggregates on the fabric can slide and separate to provide lubrication. These lamellar structures can be considered as polymeric anions when they are dispersed in water. They do not react with either anions or brighteners. At the same time they are hydrophilic and can therefore increase the rewet properties of the fabric.

The bentonite may be added in an amount of 3.0 to 20.0% based on 100% by mass of the bleaching powder, for example, 3.0%, 4.0%, 5.0%, 6.0%, 7.0%, 8.0%, 9.0%, 10.0%, 11.0%, 12.0%, 13.0%, 14.0%, 15.0%, 16.0%, 17.0%, 18.0%, 19.0%, 20.0% or the like.

The amount of the oxidizing bleaching agent added is 40.0 to 75.0% based on 100% by mass of the bleaching powder, and may be, for example, 40.0%, 44.0%, 46.0%, 48.0%, 50.0%, 52.0%, 54.0%, 56.0%, 58.0%, 60.0%, 62.0%, 64.0%, 66.0%, 68.0%, 70.0%, 72.0%, 75.0%, or the like.

The bleaching activator may be added in an amount of 3.0 to 15.0%, for example, 3.0%, 4.0%, 5.0%, 6.0%, 7.0%, 8.0%, 9.0%, 10.0%, 11.0%, 12.0%, 13.0%, 14.0%, 15.0%, or the like, based on 100% by mass of the bleaching powder.

The addition amount of the chelating agent is 0.5 to 5.0% based on 100% by mass of the bleaching powder, and may be, for example, 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, 5.0%, or the like.

Preferably, the bleaching powder comprises the following components in percentage by mass: 4.0 to 15.0 percent of bentonite, 42.0 to 70.0 percent of oxidation bleaching agent, 4.0 to 12.0 percent of bleaching activator, 0.5 to 5.0 percent of chelating agent and the balance of anhydrous sodium sulphate.

Preferably, the bleaching powder comprises the following components in percentage by mass: 5.0 to 12.0 percent of bentonite, 45.0 to 70.0 percent of oxidation bleaching agent, 4.0 to 10.0 percent of bleaching activator, 0.5 to 5.0 percent of chelating agent and the balance of anhydrous sodium sulphate.

Preferably, the bentonite comprises sodium bentonite and/or calcium bentonite.

The interlayer cation type of the bentonite determines the type of the bentonite, and the interlayer cation is Na⁺When the clay is called sodium bentonite, the interlayer cation is Ca²⁺In time, it is called calcium bentonite.

Preferably, the bentonite has a montmorillonite content of 65 to 95%, for example, 65%, 70%, 75%, 80%, 85%, 90%, etc., based on 100% by mass of the bentonite.

Preferably, the content of bentonite having a fineness of 12 to 30 mesh (for example, 12 mesh, 14 mesh, 16 mesh, 18 mesh, 20 mesh, 22 mesh, 24 mesh, 26 mesh, 28 mesh, 30 mesh, etc.) in the bentonite is 90% or more, for example, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, etc., based on 100% by mass of the bentonite.

Preferably, the water content in the bentonite is 4.0% or less, for example, 4.0%, 3.5%, 3.0%, 2.5%, 2.0%, 1.5%, 1.0%, 0.5%, or the like, based on 100% by mass of the bentonite.

Preferably, the bentonite has a pH of 8.0-11.0, and may be, for example, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, and the like.

Preferably, the active oxygen content of the oxidative bleach is 13.0% or more, and may be, for example, 13.0%, 13.2%, 13.4%, 13.6%, 13.8%, 14.0%, or the like.

Preferably, the fineness of the oxidation bleaching agent is 20 to 80 meshes, and for example, the fineness may be 20 meshes, 30 meshes, 40 meshes, 50 meshes, 60 meshes, 70 meshes, 80 meshes, and the like.

Preferably, the oxidizing bleach is sodium percarbonate and/or sodium perborate, preferably sodium percarbonate.

The sodium percarbonate is a crystalline compound formed by bonding sodium carbonate and hydrogen peroxide together by hydrogen bonds, is a high-efficiency oxidation bleaching bactericide, has the characteristics of no odor, no toxicity and no pollution, and shows strong decontamination and sterilization capabilities due to active oxygen generated by decomposition in water.

Preferably, the sodium percarbonate is coated sodium percarbonate.

In the invention, the coating type sodium percarbonate means that a stabilizer is used for coating the surface of sodium percarbonate particles, so that the sodium percarbonate particles are isolated from air, moisture and other substances, and the effect of enhancing the stability of an oxidation bleaching agent is achieved. The stabilizers include sodium silicate, sodium stearate, hydroxyethyl cellulose, sodium dodecylbenzenesulfonate and the like.

Preferably, the bleach activator comprises Tetraacetylethylenediamine (TAED) and/or sodium Decanoyloxybenzenesulfonate (DOBS), preferably Tetraacetylethylenediamine (TAED).

Among them, TAED has very excellent low-temperature activation performance, can react with HOO-generated by peroxide hydrolysis to generate peroxyacetic acid, and the bleaching performance of the peroxyacetic acid is obviously superior to that of active oxygen.

Preferably, the chelating agent comprises any one or a combination of at least two of trisodium methylglycinediacetate, tetrasodium ethylenediaminetetraacetic acid or trisodium nitrilotriacetate, preferably trisodium methylglycinediacetate.

Among them, trisodium methylglycinediacetate is a green biodegradable chelating agent, and has good solubility for inorganic precipitates besides effectively chelating various metal ions. Besides, it has very good auxiliary removal function for natural grease, sebum, blood stain, milk stain and dust stain.

Preferably, the bleaching powder also comprises 0.1-1.0% of anti-redeposition agent, for example, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, etc., based on the mass of the bleaching powder as 100%.

The anti-redeposition agent is added, so that the redeposition probability of eluted dirt on fabrics in the washing process can be effectively reduced, and the washing degree of stains can be increased by the cooperation of the anti-redeposition agent and peroxide.

Preferably, the anti-redeposition agent is an acrylic polymer.

Preferably, the weight average molecular weight of the acrylic polymer is 5 ten thousand to 10 ten thousand, and may be, for example, 5 ten thousand, 5.5 ten thousand, 6 ten thousand, 6.5 ten thousand, 7 ten thousand, 7.5 ten thousand, 8 ten thousand, 8.5 ten thousand, 9 ten thousand, 9.5 ten thousand, 10 ten thousand, and preferably 6 ten thousand to 8 ten thousand.

Preferably, the acrylic polymer comprises an acrylic homopolymer and/or a maleic-acrylic copolymer.

Preferably, the bleaching powder further comprises 0.1-1.0% of enzyme preparation, for example, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, etc., based on 100% of the bleaching powder.

Preferably, the enzyme preparation comprises any one or a combination of at least two of a protease, a lipase, an amylase, a cellulase or a mannanase.

In the present invention, the enzyme preparation is preferably a combination of protease, lipase, amylase, cellulase and mannanase. The protease is mainly used for decomposing protein stains, the lipase is mainly used for decomposing oil dirt stains, the amylase is mainly used for decomposing starch stains, the cellulase is mainly used for shearing off fiber balls on the surface of clothes to enable the clothes to be bright, the mannase is mainly used for decomposing pectin stains, and the color bleaching powder of the compound enzyme preparation containing the next five enzymes is added, so that the stability problem of compounding of various enzymes is solved, and the long-acting and strong-effect dirt-removing capacity can be kept.

Preferably, the bleaching powder further comprises, based on 100% of the bleaching powder by mass: 0.2 to 0.4 percent of protease, 0.04 to 0.06 percent of lipase, 0.02 to 0.04 percent of amylase, 0.04 to 0.06 percent of cellulase and 0.02 to 0.04 percent of mannanase.

The addition amount of the protease is 0.2-0.4% by mass of the bleaching powder, and may be, for example, 0.2%, 0.22%, 0.24%, 0.26%, 0.28%, 0.3%, 0.32%, 0.34%, 0.36%, 0.38%, 0.4% or the like.

The addition amount of the lipase is 0.04-0.06% by mass of the bleaching powder, and may be, for example, 0.04%, 0.042%, 0.046%, 0.048%, 0.05%, 0.052%, 0.054%, 0.056%, 0.058%, 0.06% or the like.

The addition amount of the amylase is 0.02 to 0.04% by mass of the bleaching powder, and may be, for example, 0.02%, 0.022%, 0.026%, 0.028%, 0.03%, 0.032%, 0.034%, 0.036%, 0.038%, 0.04%, or the like.

The addition amount of the cellulase is 0.04-0.06% by mass of the bleaching powder as 100%, and may be, for example, 0.04%, 0.042%, 0.046%, 0.048%, 0.05%, 0.052%, 0.054%, 0.056%, 0.058%, 0.06%, etc.

The addition amount of the mannanase is 0.02 to 0.04% by mass of the bleaching powder, and may be, for example, 0.02%, 0.022%, 0.026%, 0.028%, 0.03%, 0.032%, 0.034%, 0.036%, 0.038%, 0.04% or the like.

Preferably, the bleaching powder further comprises 0.1-1.0% of other additives based on 100% of the mass of the bleaching powder, and the additives can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0% and the like.

Preferably, the further adjuvants comprise perfume and/or colour-dotted particles.

In a second aspect, the present invention provides a method for preparing the color bleaching powder, wherein the method for preparing the color bleaching powder comprises: mixing and stirring bentonite, an oxidation bleaching agent, a bleaching activator, a chelating agent and anhydrous sodium sulphate to obtain the color bleaching powder.

Preferably, the mixing and stirring time is 40-80min, such as 40min, 45min, 50min, 55min, 60min, 65min, 70min, 75min, 80min, etc., and the mixing and stirring speed is 50-150r/min, such as 50r/min, 60r/min, 70r/min, 80r/min, 90r/min, 100r/min, 110r/min, 120r/min, 130r/min, 140r/min, 150r/min, etc.

Preferably, the mixing and stirring further comprises sieving, wherein the sieving mesh number is 10-80 meshes, such as 10 meshes, 20 meshes, 30 meshes, 40 meshes, 50 meshes, 60 meshes, 70 meshes, 80 meshes and the like.

Preferably, the preparation method of the color bleaching powder comprises the following steps: mixing bentonite, bleaching activator and chelating agent at 60-80r/min (such as 60r/min, 65r/min, 70r/min, 75r/min, 80r/min, etc.) for 20-30min (such as 20min, 22min, 24min, 26min, 28min, 30min, etc.), mixing with anhydrous sodium sulfate, enzyme preparation, anti-redeposition agent and other adjuvants at 75-90r/min (such as 75r/min, 80r/min, 85r/min, 90r/min, etc.) for 10-20min (such as 10min, 12min, 14min, 16min, 18min, 20min, etc.), and mixing with oxidation bleaching agent at 80-90r/min (such as 80r/min, 85r/min, 90r/min, etc.) for 10-15min (such as 10min, etc.), 11min, 12min, 13min, 14min, 15min and the like), and sieving the mixed material by a sieve of 10-80 meshes to obtain the color bleaching powder.

Compared with the prior art, the invention has the following beneficial effects:

(1) the oxidation bleaching agent of the color bleaching powder is more stable in the storage process, and the color bleaching powder not only can perform the functions of decontamination and bleaching on fabrics in the fabric washing process, but also can improve the softness and rewetting performance of the fabrics after washing;

(2) under a high-humidity environment with the relative humidity of 80%, the stability rate of active oxygen of the bleaching powder is above 55%; under the high-temperature environment with the temperature of 100 ℃, the stability rate of active oxygen of the bleaching powder is more than 90 percent; after the fabric is washed by the color bleaching powder, the softening performance scores are all over 2; the time for the color bleaching powder to continuously wet the fabrics for 30mm is within 42-52 s.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.

The sources of the components in the following examples are as follows: calcium bentonite was purchased from Vitaceae (Tianjin) mining, Inc.; coating type sodium percarbonate was purchased from Zhejiang gold Japan chemical materials Co., Ltd; tetraacetylethylenediamine (TEAD) was purchased from rihua raw materials ltd, jjj, jj; trisodium methylglycinediacetate is available from basf (Trilon M Powder); maleic-acrylic acid copolymer available from basf corporation (Sokalan CP5 Granules); proteases, lipases, amylases, cellulases and mannanases were purchased from novacin.

Examples 1 to 6

The specific components and the additive amounts (expressed by mass percent) of the color bleaching powder provided by the embodiments 1-6 are shown in the following table 1:

TABLE 1

The preparation method of the color bleaching powder comprises the following steps: opening a dust removal fan of a stirrer, mixing and stirring calcium bentonite, tetraacetylethylenediamine and trisodium methylglycine diacetate at a rotating speed of 70r/min for 25min, then mixing and stirring with anhydrous sodium sulphate, protease, lipase, amylase, cellulase, mannase, maleic acid-acrylic acid copolymer and essence at a rotating speed of 80r/min for 15min, finally mixing and stirring with coated sodium percarbonate at a rotating speed of 85r/min for 12min, and sieving the mixed material with a 50-mesh sieve to obtain the color bleaching powder.

Example 7

This example provides a color bleaching powder, which is different from example 1 in that the addition amount of the calcium bentonite is reduced to 3.0%, the addition amount of the coated sodium percarbonate is increased to 52.0%, and the contents of other components and the preparation method are the same as example 1.

Example 8

This example provides a color bleaching powder, which is different from example 1 in that the addition amount of the calcium bentonite is increased to 15.0%, the addition amount of the coated sodium percarbonate is reduced to 40.0%, and the contents of other components and the preparation method are the same as example 1.

Example 9

This example provides a bleaching powder, which differs from example 1 in that the sodium percarbonate of the coated type is replaced by sodium carbonate without coating, and the contents of other components and the preparation method are the same as example 1.

Example 10

This example provides a color bleaching powder, which is different from example 1 in that tetraacetylethylenediamine is replaced by sodium decanoyloxybenzenesulfonate, and the contents of other components and the preparation method are the same as example 1.

Comparative examples 1 to 6

The specific components and the addition amounts (expressed by mass percent) of the color bleaching powder provided by the comparative examples 1-6 are shown in the following table 2:

TABLE 2

Comparative examples 1-6 provide the same procedure for preparing the color bleaching powder as in example 1.

Comparative example 7

The comparative example provides a color bleaching powder, which is different from the example 1 in that the addition amount of the calcium bentonite is reduced to 2.0 percent, the addition amount of the coating type sodium percarbonate is increased to 53.0 percent, and the contents of other components and the preparation method are the same as the example 1.

Comparative example 8

The comparative example provides a color bleaching powder, which is different from the example 1 in that the addition amount of the calcium bentonite is increased to 21.0 percent, the addition amount of the coating type sodium percarbonate is reduced to 35.0 percent, and the contents of other components and the preparation method are the same as the example 1.

Test example 1

Active oxygen stability test

The color bleaching powders provided in examples 1-10 and the color bleaching powders provided in comparative examples 1-8 were tested for their moisture stability and thermal stability, respectively, according to the following test methods:

(1) the wet stability test method comprises the following steps: accurately weighing 10g of test sample, placing the test sample in a constant temperature and humidity box with the temperature of 35 ℃ and the relative humidity of 80% for 48h, testing the active oxygen content of the sample according to GB/T13173-. The initial active oxygen content of the sample is noted as X₁And the active oxygen content of the sample after standing for 48 hours is recorded as X₂When the ratio of active oxygen stabilization is X₂/X₁*100％；

(2) The test method of the thermal stability comprises the following steps: accurately weighing 10g of test sample, standing for 2h under the conditions that the temperature is 100 ℃ and the relative humidity is 35%, testing the active oxygen content of the sample according to GB/T13173-2008 & lt & lttest method for surfactant detergents & gt, and calculating and evaluating the stability of the active oxygen according to the active oxygen content. The initial active oxygen content of the sample is noted as X₃And the active oxygen content of the sample after standing for 2 hours is recorded as X₄When the ratio of active oxygen stabilization is X₄/X³*100％；

The results of the active oxygen stabilization rate experiments are shown in table 3:

TABLE 3

As can be seen from the test data in Table 1, the stability rate of the active oxygen of the bleaching powder is above 55% in a high-humidity environment with a relative humidity of 80%; under the high-temperature environment with the temperature of 100 ℃, the stability rate of the active oxygen of the bleaching powder is more than 90 percent. The color bleaching powder of the invention has excellent moisture stability and heat stability of the active oxygen of the oxidation bleaching agent during the storage process.

It is clear from the comparison between example 1 and comparative example 1 that the addition of bentonite not only can obviously play a role in moisture absorption and drying, and reduce the influence of moisture on the decomposition of the oxidation bleaching agent, thereby improving the moisture stability of the active oxygen of the oxidation bleaching agent, but also can improve the thermal stability of the color bleaching powder. As can be seen from the comparison of example 1 with comparative examples 2 to 6, the activated oxygen stability under high temperature and high humidity is difficult to be secured even if the content of the oxidizing bleaching agent is increased without adding bentonite to the color bleaching powder. As can be seen from the comparison between example 1 and comparative examples 7-8, when the addition amount of the bentonite in the color bleaching powder is less than 3%, the wet stability and the heat stability are poor; when the amount of bentonite added is more than 20%, the increase in the moisture stability and the heat stability is not significant.

Test example 2

Compliance testing

80g of the color bleaching powder provided by the examples 1-10 and the color bleaching powder provided by the comparative examples 1-8 are respectively added into an 8 kg-level impeller washing machine, about 6.5 kg of pure cotton new towel is used in each machine, the hardness of municipal tap water for washing is about 50-80 ppm, the washing temperature is 40 ℃, and the following manual self-defined washing process is selected: 1. main washing at 40 deg.C for 15 min; 2. draining; 3. rinsing; 4. draining; 5, rinsing; 6. draining; 7. rinsing; 8. dehydrating; 9. and (5) drying by a dryer. Each set of samples was washed 8 times in this procedure. The compliance sensory test was then performed, and each sample was scored according to the criteria of table 4 below:

TABLE 4

Scoring	Scoring labels
		-2	Is very rough
-1	Roughness of
		0	Neither rough nor soft
1	Softness
		2	Is very soft

Finally, the results (multiple sample differential analysis, i.e. grade differentiation method) were obtained according to analysis of variance (ANOVA), and the compliance performance scoring results are shown in table 5:

TABLE 5

Item	Softness rating LSD 0.49
		Example 1	2.11
Example 2	2.64
		Example 3	2.96
Example 4	2.93
		Example 5	2.17
Example 6	2.78
		Example 7	2.01
Example 8	2.99
		Example 9	2.09
Example 10	2.10
		Comparative example 1	0.59
Comparative example 2	0.55
		Comparative example 3	0.51
Comparative example 4	0.53
		Comparative example 5	0.54
Comparative example 6	0.53
		Comparative example 7	1.01
Comparative example 8	3.08

The test results in table 2 show that after the fabric is washed by the color bleaching powder disclosed by the invention, the softening performance scores are all over 2, and the fabric is very soft. The color bleaching powder disclosed by the invention is more stable in oxidation bleaching agent in the storage process, and can also increase the washed softness of fabrics.

As can be seen from the comparison between the example 1 and the comparative examples 1 to 6, the bentonite added into the color bleaching powder can effectively reduce the friction factor among the fabric fibers, so that the fibers can freely stretch and are not easy to bond into lumps, the function of softening the fabric is achieved, and the washed clothes have good flexibility.

As can be seen from the comparison between the example 1 and the comparative examples 7 to 8, the softness performance of the color bleaching powder is not obviously increased when the addition amount of the bentonite is less than 3 percent; and when the addition amount of the bentonite is more than 20%, the adsorption amount of the bentonite in one washing reaches saturation, most of the bentonite is carried away by water in the washing process, and therefore the increase of the flexibility is not obvious.

Test example 3

Rewet Performance test

The rewetting performance of the color bleaching powders provided in examples 1-10 and the color bleaching powders provided in comparative examples 1-8 were tested, respectively, and the test for the laundered fabrics was: white cotton cloth (white cotton cloth specified by GB/T13174-2008 standard is selected); washing conditions are as follows: the rotating speed of the vertical decontamination machine is 70r/min according to the RQHL model specified in GB/T13174-2008; using 250ppm (Ca)²⁺/Mg²⁺3/2) hard water, the bleaching powder of the example or the comparative example is added respectively, the rinsing concentration is 2.0g/L, the washing temperature is 40 ℃, and the washing time is 15 min. Rinsing the washed white cotton cloth according to GB/T13174-2008, dewatering, and drying by air at 30 ℃. Washing for 40 times according to the steps; then, the rewetting performance of the fabric softener is tested by referring to QB/T4309-:

TABLE 6

Item	Time/s for white cotton cloth to continuously wet for 30mm
		Example 1	50
Example 2	49
		Example 3	46
Example 4	46
		Example 5	51
Example 6	44
		Example 7	52
Example 8	42
		Example 9	51
Example 10	50
		Comparative example 1	58
Comparative example 2	57
		Comparative example 3	59
Comparative example 4	59
		Comparative example 5	60
Comparative example 6	58
		Comparative example 7	43
Comparative example 8	42

As can be seen from the test data in Table 6, the time for the color bleaching powder to continuously wet the fabric for 30mm is within 42-52s, the rewetting performance of the fabric after washing is obviously improved by the color bleaching powder, the fabric absorbs more water after washing, and the wearing or using comfort of the fabric can be improved.

As can be seen from the comparison between example 1 and comparative examples 1-6, the addition of bentonite to the color bleaching powder can effectively improve the rewetting property of the fabric, because the micro bentonite is adsorbed on the surface of the fabric, and the adsorption hydrophilic property of the bentonite shortens the adsorption time of the fabric to water. As can be seen from the comparison between example 1 and comparative examples 7-8, when the addition amount of bentonite in the color bleaching powder is less than 3%, the rewetting property is reduced; and when the addition amount of the bentonite is more than 20%, the adsorption amount of the bentonite in one washing reaches saturation, most of the bentonite is taken away by water in the washing process, and therefore the rewetting property is not obviously improved.

Test example 4

Bleaching Performance test

Washing the color bleaching powder provided by the examples 1-10 and the color bleaching powder provided by the comparative examples 1-8 according to the GB/T13174-2008 standard respectively, wherein a decontamination machine is in an RQHL vertical type, the washing concentration is 1.0g/L, the washing temperature is 40 ℃, and the washing time is 15 min; separately measuring the whiteness W of the soiled cloths after washing₂Whiteness value W before washing₁Difference in whiteness of W₂-W₁The larger the difference, the better the bleaching performance.

The results of the whiteness difference test for various soils on bleaching are shown in table 7:

TABLE 7

As can be seen from the test data in Table 1, the difference of whiteness of the color bleaching powder before and after the rinsing of coffee stain cloth is 32.63-41.50, the difference of whiteness of the tea stain cloth is 18.77-26.58, the difference of whiteness of the tomato sauce stain cloth is 14.35-21.17, the difference of whiteness of the soy sauce stain cloth is 15.96-21.04, the difference of whiteness of the blood stain cloth is 9.70-14.92, and the difference of whiteness of the spinach stain cloth is 10.11-16.20. The color bleaching powder has excellent rinsing effect and bleaching performance on various stubborn stains.

As can be seen from the comparison between example 1 and comparative examples 1-6, the bentonite added to the bleaching powder has certain washing assistant performance because the bentonite has calcium-magnesium ion exchange capacity and the swelling performance of the bentonite in washing liquid can help the opening of fabric fibers. However, the main factor affecting bleaching of pigmentary stains is the peroxide content. So that the difference of the washing whiteness under the condition of the same active oxygen content is not large. However, the bentonite has obvious stabilizing effect on the oxidation bleaching agent, so that the bentonite can indirectly improve the bleaching performance of the bleaching powder stored for a long time.

As can be seen from the comparison between example 1 and comparative examples 7-8, in the case of too small content of bentonite in the bleaching powder, the bleaching performance is improved more limitedly even if the content of peroxide is increased, and the bleaching performance is inevitably gradually weakened after long-term storage; when the amount of bentonite added is too large, the content of active oxygen decreases due to the decrease of the content of peroxide, and the bleaching ability of the composition against pigment stains is remarkably decreased.

The applicant states that the invention is illustrated by the above examples and the preparation method of the bleaching powder of the invention, but the invention is not limited to the above examples, i.e. it does not mean that the invention must be implemented by the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims

1. The bleaching powder is characterized by comprising the following components in percentage by mass: 3.0 to 20.0 percent of bentonite, 40.0 to 75.0 percent of oxidation bleaching agent, 3.0 to 15.0 percent of bleaching activator, 0.5 to 5.0 percent of chelating agent and the balance of anhydrous sodium sulphate.

2. The bleaching powder according to claim 1, comprising by mass: 4.0-15.0% of bentonite, 42.0-70.0% of oxidation bleaching agent, 4.0-12.0% of bleaching activator, 0.5-5.0% of chelating agent and the balance of anhydrous sodium sulphate;

3. The bleaching powder according to claim 1 or 2, wherein the bentonite comprises sodium bentonite and/or calcium bentonite;

preferably, the content of montmorillonite in the bentonite is 65-95% based on 100% of the mass of the bentonite;

preferably, the content of bentonite with the fineness of 12-30 meshes in the bentonite is more than 90 percent based on 100 percent of the mass of the bentonite;

preferably, the content of water in the bentonite is below 4.0 percent based on the mass of the bentonite as 100 percent;

preferably, the bentonite has a pH of 8.0 to 11.0.

4. The bleaching powder according to any one of claims 1 to 3 wherein the oxidative bleach has an active oxygen content of 13.0% or more;

preferably, the fineness of the oxidation bleaching agent is 20-80 meshes;

preferably, the oxidizing bleaching agent is sodium percarbonate and/or sodium perborate, preferably sodium percarbonate;

preferably, the sodium percarbonate is coated sodium percarbonate;

preferably, the bleach activator comprises tetraacetylethylenediamine and/or sodium decanoyloxybenzenesulfonate, preferably tetraacetylethylenediamine;

5. The bleaching powder according to any one of claims 1 to 4, wherein the bleaching powder further comprises 0.1 to 1.0% of an anti-redeposition agent based on 100% of the mass of the bleaching powder;

preferably, the antiredeposition agent is an acrylic polymer;

preferably, the weight average molecular weight of the acrylic polymer is 5 to 10 ten thousand, preferably 6 to 8 ten thousand;

6. The bleaching powder according to any one of claims 1 to 5, wherein the bleaching powder further comprises 0.1 to 1.0% of an enzyme preparation based on 100% of the bleaching powder;

preferably, the enzyme preparation comprises any one of or a combination of at least two of a protease, a lipase, an amylase, a cellulase or a mannanase, preferably a combination of a protease, a lipase, an amylase, a cellulase and a mannanase;

7. The bleaching powder according to any one of claims 1 to 6, wherein the bleaching powder further comprises 0.1 to 1.0% of other additives based on 100% of the bleaching powder;

8. The method for preparing the color bleaching powder according to any one of claims 1-7, wherein the method for preparing the color bleaching powder comprises the following steps: mixing and stirring bentonite, an oxidation bleaching agent, a bleaching activator, a chelating agent and anhydrous sodium sulphate to obtain the color bleaching powder.

9. The preparation method according to claim 8, wherein the mixing and stirring time is 40-80min, and the rotation speed of the mixing and stirring is 50-150 r/min;

preferably, the mixing and stirring process further comprises sieving, wherein the sieving mesh number is 10-80 meshes.

10. The preparation method of claim 8 or 9, wherein the preparation method of the color bleaching powder comprises the following steps: mixing and stirring bentonite, a bleaching activator and a chelating agent at the rotating speed of 60-80r/min for 20-30min, then mixing and stirring the bentonite, the bleaching activator and the chelating agent with anhydrous sodium sulphate, an enzyme preparation, an anti-redeposition agent and other auxiliary agents at the rotating speed of 75-90r/min for 10-20min, finally mixing and stirring the anhydrous sodium sulphate, the enzyme preparation, the anti-redeposition agent and the other auxiliary agents with an oxidation bleaching agent at the rotating speed of 80-90r/min for 10-15min, and sieving the mixed material with a sieve of 10-80 meshes to obtain the color bleaching powder.