CN102605619B - Sericin post-finishing method for cotton fabrics - Google Patents

Abstract

The invention discloses a sericin post-finishing method for cotton fabrics, which comprises the following steps: (a) configuring settling impregnation liquid: dissolving 3-5% of dissolvable sericin powder counted by mass in hot water, and then adding 1-3% of chitosan quaternary ammonium salt, fully stirring and dissolving, and adding 4-6% of cross-linking agent, and (b) completely steeping the cotton fabrics in the settling impregnation liquid at a solution bath ratio of 1:(30-50), steeping for at least 20 minutes, twice steeping and twice rolling, keeping mangle expression more than 80%, anddrying, thereby obtaining the cotton fabrics. The invention develops the post-finishing method special for the cotton fabrics. The cotton fabrics prepared according to the post-finishing method have better washing fastness and anti-bacteria rate; after the cotton fabrics are washed for five times, a dissolving loss rate is about 0.21% and the anti-bacteria rate is 93.8%; the practical use requirement is fully met; and an extraordinary technical effect is obtained.

Description

A kind of sericin finishing method of cotton fabric

technical field

The invention relates to a sericin post-finishing method for cotton fabrics.

Background technique

The main body of silk fiber is silk fibroin, and sericin is coated on the periphery of silk fibroin, and sericin plays a protective and adhesive role on silk fibroin. Sericin is a biomaterial with excellent performance, which provides an extremely important application material for the development of new functional biomaterials. For example, sericin can be used as an additive for synthetic polymer materials. The physical properties of the resulting polymer materials can not only be improved, but also the polymer materials can be rapidly degraded by microorganisms and become excellent environmental protection materials; the mixture of sericin and silk fibroin The composed silk protein film will be a promising artificial skin. With the research on the structure and performance of sericin by scholars at home and abroad, sericin has been widely used in various aspects. Studies have shown that sericin and its hydrolyzed products with small molecular weight (average molecular weight 15000~30000D) have excellent moisture absorption, moisture release performance and antioxidant capacity, and can inhibit tyrosinase activity, skin care and beauty, nourish skin, and inhibit melanin. And many other effects. Therefore, sericin-finished textiles, especially underwear materials that directly contact human skin, have attracted great attention from scholars at home and abroad. The reason why people love the textiles after sericin is that the textiles after sericin have excellent moisturizing, humidity-regulating properties, antistatic properties, soft and comfortable, and the fabrics coated with sericin also have Significant antibacterial effect. Therefore, sericin has broad development prospects as a new textile health care finishing material.

However, since sericin lacks functional groups that react with fibers, in order to obtain a durable finishing effect, a highly reactive cross-linking agent must be selected so that sufficient covalent cross-linking reactions can occur between sericin and fibers. The existing cross-linking agents mainly include epoxy compounds, which can evenly coat sericin on the fabric. The hygroscopicity of the coated fabric is greatly improved, but the cross-linking agent needs to be heated at about 150°C. High-temperature baking can complete cross-linking and curing on the fabric, and high-temperature baking can easily cause fabric yellowing, there is a hidden danger of fabric strength decline, and its hand feel is poor.

Japanese Patent Laid-Open No. 9-31847 reports a functional fiber product and a manufacturing method thereof, in which chitin is used as a crosslinking agent to coat sericin on textiles. However, the resulting textiles have a rough hand and poor wash fastness.

Chinese invention patent CN101694060B discloses a sericin post-finishing method for cashmere products. The cashmere products obtained by it have better washability, but experiments have shown that when the above method is applied to cotton fabrics, the cotton fabrics obtained have lower washability. Poor, that is, the dissolution and loss rate of sericin is high, so it cannot be used normally, and the above method does not take into account the problem of antibacterial rate.

Chinese invention patent application CN101279103A discloses a silk protein composite coating solution and its preparation method and application, and the crosslinking agent used is a compound of silkworm chrysalis chitosan, chitosan or hydrocarbon-based silane compound and catalyst ZnCl ₂ . However, experiments have shown that after finishing cotton fabrics with the above-mentioned coating solution, the obtained cotton fabrics have poor washability and cannot be used normally.

Therefore, how to carry out sericin finishing to cotton fabrics, to obtain the cotton fabrics with good washability, has become a technical problem that the industry has always been eager to solve but has not been successful.

Contents of the invention

The object of the invention is to provide a sericin post-finishing method for cotton fabrics.

In order to achieve the above object, the technical solution adopted in the present invention is: a method for finishing sericin of cotton fabrics, comprising the steps of:

(a) Prepare impregnation solution: by mass, dissolve 3~5% of soluble sericin powder in hot water, then add 1~3% of chitosan quaternary ammonium salt to it, fully stir and dissolve, then add 4~6% cross-linking agent;

The average molecular weight of the easily soluble sericin powder is 18000~25000D; the temperature of the hot water is 80~95°C; the crosslinking agent includes a dispersant sodium polyacrylate and a silane coupling agent, and the mass ratio of the two is 3.0~3.5: 3~4; the silane coupling agent is selected from vinylsilane, aminosilane, methacryloxysilane, mercaptosilane or ureidosilane;

(b) Completely immerse the cotton fabric in the above-mentioned finishing impregnation solution, the bath ratio of the solution is 1:30~50, immerse for at least 20 minutes, two dips and two rolling, the liquid rolling rate is greater than 80%, and drying, the cotton fabric can be obtained .

In the above technical solution, before the step (b), the cotton fabric is pre-boiled in boiling water for more than 30 minutes, washed and dried.

The present invention also claims the cotton fabric obtained according to the above finishing method.

Mechanism of the present invention is: the pH value of the isoelectric point of sericin is 3.8～4.5, in the aqueous solution (pH value is 7.0), silk band is negatively charged, and chitosan quaternary ammonium salt solution is positively charged, and negatively charged Sericin can be well combined to form micro-particles. The micro-particles themselves have a certain adhesive effect on cotton fabrics, and the effect of crosslinking agent further improves the adhesive ability and washability of sericin to cotton fabrics. sex.

Due to the use of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art:

1. The present invention develops a post-finishing method specially used for cotton fabrics. The cotton fabrics produced by the method have good wash resistance and antibacterial rate, and solve the technical problems that the industry has always been eager to solve but has not been successful.

2. Experiments have proved that the sericin-coated cotton cloth prepared by the present invention has a dissolution rate of about 0.21% after washing 5 times, and a bacteriostasis rate of 93.8%, which fully meets the requirements of actual use and has achieved unexpected technical effects.

3. Amino acid analysis shows that the hydrophilic amino acid content of the cotton fabric obtained in the present invention is improved, and its moisture absorption and release properties, thermal insulation performance and moisture permeability are all improved, and the hand feels soft and smooth, which improves the wearing comfort of the human body. A new type of high value-added cotton fabric.

4. The preparation method of the invention is simple, easy to operate, can save energy, and has good application prospects.

Description of drawings

Accompanying drawing 1 is the comparison diagram of the moisture absorption and release performance of cotton fabrics before and after sericin finishing in Example 1 of the present invention.

Detailed ways

The present invention will be further described below in conjunction with embodiment:

Embodiment one

A sericin post-finishing method for cotton fabrics, comprising the steps of:

(a) Prepare impregnating solution: by mass, dissolve 5% of soluble sericin powder in hot water, then add 2% of chitosan quaternary ammonium salt, fully stir and dissolve, then add 5% of sericin powder joint agent;

The average molecular weight of the easily soluble sericin powder is 25000D; the temperature of the hot water is 90°C; the crosslinking agent includes a dispersant sodium polyacrylate and a silane coupling agent, and the mass ratio of the two is 3.0:4; The silane coupling agent is selected from vinylsilane, aminosilane, methacryloxysilane, mercaptosilane or ureidosilane;

(b) Completely immerse the cotton fabric in the above-mentioned finishing impregnation solution, the bath ratio of the solution is 1:40, immerse for at least 20 minutes, double dipping and two rolling, the liquid rolling rate is greater than 80%, and dry to obtain the cotton fabric.

Comparative example one

According to the disclosed method of Chinese invention patent CN101694060B, the cotton fabric is subjected to sericin finishing to obtain the cotton fabric.

Comparative example two

The cotton fabric is finished by adopting the silk protein composite coating solution disclosed in the Chinese invention patent application CN101279103A to obtain the cotton fabric.

Then the test of dissolution rate and bacteriostasis rate is carried out to the cotton fabric of embodiment one and comparative example one, comparative example two, the results are as follows:

As can be seen from the above tests, compared with Comparative Example 1 and Comparative Example 2, the cotton fabric obtained in Example 1 has better wash resistance and antibacterial rate, can fully meet the actual use requirements, and has achieved unexpected results. technical effect.

Then the cotton fabric that above-mentioned preparation method obtains has been tested, specifically as follows:

test one

Tested the weight gain effect and the washability of the cotton fabric of the present embodiment, the results are as shown in the table:

It can be seen from the above table that compared with before finishing, the cotton fabric after finishing has a weight gain of 2.30% after 2 washes, 1.92% after 3 washes, and 1.73% after 5 washes, and the dissolution rate is relatively low after 3 washes. . Therefore, its washing resistance is better.

Test two

The moisture regain of the cotton fabric after sericin finishing was tested, and compared with the ordinary unfinished cotton fabric, the results are shown in the following table:

Moisture regain of cotton fabrics before and after sericin finishing

It can be seen from the table that the moisture regain of the unfinished cotton fabric is 7.34, and the moisture regain of the cotton fabric (unwashed) after sericin treatment is 7.43, which shows that as the sericin content on the surface of the fabric (hydrophilic amino acid content) increases, the moisture regain of the cotton fabric after sericin finishing gradually increases, even surpassing that of the unfinished cotton fabric.

Trial Three

The drapability of the cotton fabric after sericin finishing was tested and compared with that of ordinary unfinished cotton fabric. The results are shown in the table below:

Drapability of Cotton Fabrics Before and After Sericin Finishing

It can be seen from the table that the drape coefficient of the cotton fabric after sericin treatment is relatively large. When the drape area of the fabric sample is larger, that is, the drape coefficient is larger, which means that the wrinkle resistance of the fabric is improved. The crease resistance of the finished cotton fabric has been improved to a certain extent.

test four

The moisture permeability of cotton fabrics finished with sericin was tested, and compared with ordinary unfinished cotton fabrics, the results are shown in the following table:

Moisture permeability of cotton fabrics before and after sericin finishing

The above test results are the average values after multiple tests. It can be seen from the table that among the samples of cotton fabrics before and after sericin finishing, the average moisture permeability of cotton fabrics and sericin-finished cotton fabrics is 2849.34 g respectively. /m ² .d, that is, the moisture permeability of cotton fabrics treated with sericin is better, and with the increase of sericin concentration, the moisture permeability of cotton fabrics after finishing also increases. There are two main ways for water vapor to pass through the fabric. One is that the fibers on the side of the fabric in contact with the high-humidity air absorb moisture from the high-humidity air, and the water vapor is transferred from the fiber to the other side of the fabric, and releases moisture to the low-humidity air; Another way is that the water vapor directly passes through the gaps between the yarns and fibers in the fabric, and diffuses to the other side of the fabric. In this experiment, since the selected sample specifications and finishing conditions are the same, it can be considered that the difference in moisture permeability is mainly caused by the former method, that is, the fixation amount of sericin on the fabric surface. The proportion of hydrophilic amino acids in sericin is relatively large, and the hydrophilic groups on the surface of cotton fabrics after sericin treatment increase. Therefore, under the same conditions, cotton fabrics treated with sericin have better moisture permeability.

Test five

The moisture absorption and release performance of the cotton fabric after sericin finishing was tested, and compared with the common unfinished cotton fabric, the results are shown in Figure 1. It can be seen from the figure that the moisture absorption and release performance of the cotton fabric after sericin finishing is greater than that of the unfinished cotton fabric, which shows that the surface of the cotton fabric after sericin finishing is fixed with sericin, and the moisture absorption and release performance is relatively good, which improves the human body wearing clothes. wearing comfort.

Test six

The thermal insulation of cotton fabric after sericin finishing was tested, and compared with ordinary unfinished cotton fabric, the results are as follows:

It can be seen from the above table that the thermal insulation rate and Cro value of cotton fabrics treated with sericin increased by 2.16% and 0.0212 respectively compared with unfinished cotton fabrics, and the heat transfer coefficient decreased by 7.32W/m ² .℃. The larger the Cro value, the better the warmth retention of the fabric, and the lower the heat transfer coefficient, the better the warmth retention. It is proved by experiments that the warmth retention property of the cotton fabric after sericin treatment is improved.

Claims (3)

1. the sericin afterfinish method of a COTTON FABRIC, is characterized in that, comprises the steps:

(a) configuration arranges maceration extract: in mass, 3 ~ 5% ease of solubility sericin powder is used the hot water dissolving, then add wherein 1 ~ 3% chitosan quaternary ammonium salt, fully after stirring and dissolving, add 4 ~ 6% crosslinking agent;

The mean molecule quantity of described ease of solubility sericin powder is 18000 ~ 25000D; The temperature of described hot water is 80 ~ 95 ℃; Described crosslinking agent comprises dispersant Sodium Polyacrylate and silane coupler, and both mass ratioes are 3.0 ~ 3.5:3 ~ 4; Described silane coupler is selected from vinyl silanes, amino silane, methacryloxypropyl silane, hydrosulphonyl silane or ureido silane;

(b) with the COTTON FABRIC thorough impregnation in above-mentioned arrangement maceration extract, solution bath flood 20 minutes than for 1:30 ~ 50 at least, two soak two rolls, pick-up rate is dried greater than 80%, can obtain COTTON FABRIC.

2. the sericin afterfinish method of COTTON FABRIC according to claim 1, it is characterized in that: described step (b) is boiled COTTON FABRIC more than 30 minutes before in advance in boiling water, washing, oven dry.

3. the COTTON FABRIC that obtains of afterfinish method according to claim 1.

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