CN119843486A - A fabric ultraviolet absorber composition and preparation method thereof - Google Patents
A fabric ultraviolet absorber composition and preparation method thereof Download PDFInfo
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- CN119843486A CN119843486A CN202510346464.6A CN202510346464A CN119843486A CN 119843486 A CN119843486 A CN 119843486A CN 202510346464 A CN202510346464 A CN 202510346464A CN 119843486 A CN119843486 A CN 119843486A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/322—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing nitrogen
- D06M13/35—Heterocyclic compounds
- D06M13/352—Heterocyclic compounds having five-membered heterocyclic rings
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
- D06M11/46—Oxides or hydroxides of elements of Groups 4 or 14 of the Periodic Table; Titanates; Zirconates; Stannates; Plumbates
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material
- D06M2200/25—Resistance to light or sun, i.e. protection of the textile itself as well as UV shielding materials or treatment compositions therefor; Anti-yellowing treatments
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- Textile Engineering (AREA)
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Abstract
The application relates to the technical field of polymer assistants, in particular to a fabric ultraviolet absorber composition and a preparation method thereof. The fabric ultraviolet absorbent composition comprises, by weight, 20-50 parts of ultraviolet absorbent, 6-13 parts of dispersing agent, 0.3-0.8 part of defoamer and 80-180 parts of water, wherein the dispersing agent is an amino-terminated hyperbranched polymer grafted by nano titanium dioxide. The UPF value of the ultraviolet absorbent composition can reach 40+ and even 50+, the ultraviolet transmittance can reach 4.15-3.34%, the change rate of D90 after the heat storage time at 80 ℃ is changed from 20min to 40min can reach 25.64-21.24%, and the obtained ultraviolet absorbent is excellent in ultraviolet resistance and stable in heat storage particle size.
Description
Technical Field
The application relates to the technical field of polymer assistants, in particular to a fabric ultraviolet absorber composition and a preparation method thereof.
Background
Ultraviolet rays exist in our daily life at all times, and proper ultraviolet radiation is beneficial to human bodies, but excessive irradiation of ultraviolet rays damages human bodies and affects health. The textile is used as a first line of defense against ultraviolet radiation, excessive ultraviolet radiation is prevented, and ultraviolet resistant finishing is particularly important for the original textile with poor ultraviolet resistance.
The anti-ultraviolet method of the fabric is mainly two methods of shielding the ultraviolet absorber for improving the scattering and refraction of light and improving the ultraviolet absorption.
The ultraviolet light absorber is usually present in the form of particles, the size of which has a significant effect on performance. Under thermal storage conditions, the particle size may change, possibly affecting the ultraviolet absorption efficiency, compatibility with other materials, etc. Therefore, it is necessary to design an ultraviolet absorber having a stable thermal storage particle diameter to improve the effect of ultraviolet rays.
Disclosure of Invention
In order to improve the thermal storage stability of the ultraviolet absorber, the application provides a fabric ultraviolet absorber composition and a preparation method thereof. In a first aspect, the present application provides a fabric ultraviolet absorber composition, which adopts the following technical scheme.
The fabric ultraviolet absorbent composition comprises the following raw materials, by weight, 20-50 parts of ultraviolet absorbent, 6-13 parts of dispersing agent, 0.3-0.8 part of defoaming agent and 80-180 parts of water;
wherein the dispersing agent is an amino-terminated hyperbranched polymer grafted by nano titanium dioxide;
The preparation method of the nano titanium dioxide grafted amino-terminated hyperbranched polymer comprises the following steps:
1) Pretreatment of nano titanium dioxide
Carrying out surface treatment on the nano titanium dioxide by using sodium hydroxide solution, and introducing hydroxyl groups on the surface of the nano titanium dioxide to obtain hydroxyl-nano titanium dioxide;
2) Introduction of reactive groups
Using gamma-glycidol ether oxypropyl trimethoxy silane to react with hydroxyl-nano titanium dioxide, and introducing epoxy groups on the surface of the hydroxyl-nano titanium dioxide to obtain epoxy-nano titanium dioxide;
3) Grafting reaction
Mixing epoxy-nano titanium dioxide and amino-terminated hyperbranched polymer in a solvent, reacting for 6-8 hours at 80-100 ℃ under the action of a catalyst, centrifuging and drying after the reaction is finished to obtain the nano titanium dioxide grafted amino-terminated hyperbranched polymer
The weight ratio of the nano titanium dioxide to the amino-terminated hyperbranched polymer is 1 (0.5-0.7).
By adopting the technical scheme, the hyperbranched polymer and the nano titanium dioxide are compounded, and the hyperbranched polymer has a highly branched structure and a large number of terminal functional groups, can be combined with an ultraviolet absorbent through physical adsorption or chemical bonding, and provides good dispersion performance.
The amino-terminated hyperbranched polymer grafted by nano titanium dioxide is used as a dispersing agent, dispersing agent molecules are adsorbed on the surfaces of ultraviolet absorber particles to form an adsorption layer with a certain thickness, and three-dimensional steric hindrance is formed, so that aggregation of the particles due to collision in a heat storage process is prevented, a good dispersing state of the particles is maintained, and the heat stability is improved. Meanwhile, the dispersing agent enables the surfaces of the ultraviolet absorber particles to generate electrostatic charges, so that the particles are mutually repelled, and in the heat storage process, the electrostatic repulsive force can effectively prevent the particles from being gathered together due to heat movement, maintain uniform dispersion of the particles and ensure stable performance of the ultraviolet absorber.
In addition, the nano titanium dioxide grafted amino-terminated hyperbranched polymer can reduce the surface tension between the ultraviolet absorbent and the surrounding medium, so that the ultraviolet absorbent is better wetted by water, and plays a bridge role between the ultraviolet absorbent and the water, so as to promote intermolecular interaction between the ultraviolet absorbent and the water, and enable the ultraviolet absorbent to be better combined with the medium. In the heat storage process, the phenomenon of phase separation or precipitation caused by incompatibility with a medium is avoided, the heat storage medium can be more uniformly dispersed in the medium when heated, the performance change caused by overhigh or overlow local concentration is reduced, and the heat storage stability is improved.
Further, the preparation method of the amino-terminated hyperbranched polymer comprises the following steps:
a) Dissolving 3, 5-diaminobenzoic acid in a solvent to obtain a3, 5-diaminobenzoic acid solution;
b) Adding a catalyst into the 3, 5-diaminobenzoic acid solution, then heating to 120-150 ℃, reacting for 7-9h, and removing water generated by the reaction through condensation and reflux in the reaction process;
c) Cooling the reaction system to 50-80 ℃, then adding ethylenediamine, and continuing to react for 30-45min to obtain a reactant solution;
d) Dripping the reaction product solution into diethyl ether solvent to precipitate and separate out polymer, and filtering, washing and drying to obtain amino end capped hyperbranched polymer
Further, the weight ratio of the 3, 5-diaminobenzoic acid to the ethylenediamine is 1 (0.3-0.7).
Further, the amino-terminated hyperbranched polymer is grafted with benzophenone, and the grafting method comprises the following steps:
i. Adding amino-terminated hyperbranched polymer and glycidyl methacrylate into toluene solvent,
Adding a catalyst, reacting for 8-12 hours at 80-100 ℃, and introducing double bonds into the hyperbranched polymer to obtain a double bond-amino end capped hyperbranched polymer;
reacting benzophenone with acryloyl chloride in methylene dichloride in the presence of triethylamine, and introducing acryloyl on benzene ring of the benzophenone to obtain a benzophenone compound containing double bonds;
Mixing the double bond-amino end capped hyperbranched polymer ii obtained in the step i and the diphenyl ketone compound containing double bonds, adding the mixture into an organic solvent together with a free radical initiator, and carrying out free radical polymerization reaction at 60-80 ℃ in a protective gas atmosphere;
And iii, dialyzing and freeze-drying after the reaction is finished to obtain the amino-terminated hyperbranched polymer of the grafted benzophenone.
Further, the weight ratio of the diphenyl ketone to the amino-terminated hyperbranched polymer is 1 (6-9).
Further, the ultraviolet absorber is UV-326.
In a second aspect, the present application provides a preparation method for preparing a fabric ultraviolet absorber composition, which adopts the following technical scheme.
A method of making a fabric uv absorber composition comprising the steps of:
S1, mixing an ultraviolet absorbent, a dispersing agent, a defoaming agent and water to obtain pre-dispersed liquid, wherein the dosage of the defoaming agent is 1/2-2/3 of the total amount of the defoaming agent;
s2, grinding the pre-dispersed liquid with the aid of a grinding medium;
S3, adding residual defoaming agent after grinding, and centrifugally defoaming;
s4, filtering to remove the grinding medium to obtain suspension, and storing in a sealed and light-proof way.
Further, the grinding medium is glass beads, and the ratio of the glass beads to the pre-dispersion liquid is 1 (2-3) by volume.
In summary, the application has the following beneficial effects:
According to the application, hyperbranched polymer and nano titanium dioxide are compounded to be used as a dispersing agent, dispersing agent molecules are adsorbed on the surfaces of ultraviolet absorber particles, phase separation or precipitation phenomenon caused by incompatibility with a medium is avoided in the heat storage process, the hyperbranched polymer and nano titanium dioxide can be more uniformly dispersed in the medium when heated, the performance change caused by overhigh or overlow local concentration is reduced, and the heat storage stability is improved. The UPF value of the obtained ultraviolet absorbent composition can reach 40+ or even 50+, the ultraviolet transmittance can reach 4.15-3.34%, the change rate of D90 can reach 25.64-21.24% after the heat storage time at 80 ℃ is changed from 20min to 40min, and the obtained ultraviolet absorbent is excellent in ultraviolet resistance and stable in heat storage particle size.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation of starting materials and intermediates
Raw materials
An ultraviolet absorber, UV-326;
defoaming agents, silicone defoaming agents;
Nano titanium dioxide, 200-300nm;
gamma-glycidoxypropyl trimethoxysilane, analytically pure;
3, 5-diaminobenzoic acid, analytically pure;
ethylenediamine, analytically pure;
diethyl ether, analytically pure;
glycidyl methacrylate, analytically pure;
Benzophenone, analytically pure;
Acrylic chloride, analytically pure;
Triethylamine, analytically pure;
Dichloromethane, analytically pure;
a free radical initiator, azobisisobutyronitrile.
Preparation example
Preparation example 1
An amino-terminated hyperbranched polymer, which is prepared by the following steps:
a) 1kg of 3, 5-diaminobenzoic acid is dissolved in 10kg of DMSO solvent to obtain 3, 5-diaminobenzoic acid solution, the dissolution temperature is controlled at 45 ℃ , the magnetic stirring speed is 400rpm , and the dissolution time is 45min until the solution is clarified ;
b) Adding 10g of p-toluenesulfonic acid catalyst into the 3, 5-diaminobenzoic acid solution obtained in a), heating to 135 ℃, condensing and refluxing under the protection of nitrogen, and reacting for 8 hours;
c) Cooling the reaction system to 60 ℃, then adding 0.5kg of ethylenediamine, and continuing to react for 40min to obtain a reactant solution;
d) Dropwise adding the reaction product solution into an diethyl ether solvent according to the volume ratio of 1:4, standing for 3 hours to precipitate a polymer, filtering, washing with ethanol-water mixed solution and pure water according to the volume ratio of 1:1 for 3 times, removing unreacted monomers and catalyst residues, washing and drying to obtain the amino-terminated hyperbranched polymer.
Preparation example 2
Unlike preparation example 1, the amount of ethylenediamine used in step c) of preparation example 2 was 0.3kg.
Preparation example 3
Unlike preparation example 1, the amount of ethylenediamine in step c) of preparation example 2 was 0.7kg.
Preparation example 4
Unlike preparation example 1, the amount of ethylenediamine in step c) of preparation example 2 was 1.0kg.
Preparation example 5
An amino-terminated hyperbranched polymer grafted with benzophenone, which is prepared by the following steps:
i. Adding 7kg of amino-terminated hyperbranched polymer and 2kg of glycidyl methacrylate into 55kg of toluene solvent, adding 10g -dimethylaminopyridine catalyst, reacting for 10 hours at 90 ℃ under the protection of nitrogen, and introducing double bonds into the hyperbranched polymer to obtain double bond-amino-terminated hyperbranched polymer;
Mixing 1kg of benzophenone with 0.5kg of acryloyl chloride, adding 0.8kg of triethylamine as an acid binding agent, reacting in 450kg of methylene dichloride solvent, and introducing acryloyl on benzene ring of the benzophenone to obtain a benzophenone compound containing double bonds;
Mixing the double bond-amino end capped hyperbranched polymer ii obtained in the step i and the benzophenone compound containing double bonds, adding the mixture into 40kg of toluene organic solvent together with 0.5kg of free radical initiator, and carrying out free radical polymerization for 8 hours at 70 ℃ in a nitrogen protection gas atmosphere;
after the reaction, using a dialysis bag with a molecular weight cut-off of 4kDa , dialyzing in deionized water for h , changing water every 4h, and freeze-drying to obtain the amino-terminated hyperbranched polymer of grafted benzophenone.
Preparation example 6
Unlike preparation 5, the weight ratio of benzophenone to amino-terminated hyperbranched polymer in preparation 6 was 1:6, and the other raw material ratios were unchanged.
Preparation example 7
Unlike preparation 5, the weight ratio of benzophenone to amino-terminated hyperbranched polymer in preparation 6 was 1:9, and the other raw material ratios were unchanged.
Preparation example 8
The preparation method of the nano titanium dioxide grafted amino-terminated hyperbranched polymer comprises the following steps:
1) Pretreatment of nano titanium dioxide
Dispersing 1kg of nano titanium dioxide in 0.5M sodium hydroxide solution in an ultrasonic manner, stirring for 2h at 80 ℃, centrifuging, washing to be neutral, and drying to obtain hydroxyl-nano titanium dioxide;
2) Introduction of reactive groups
1.2Kg of gamma-glycidoxypropyl trimethoxysilane and hydroxyl-nano titanium dioxide react in 50L of absolute ethanol solvent under the protection of 70 ℃ nitrogen at a temperature of ℃ for 12h , and after centrifugation, ethanol washing and vacuum drying are carried out at a temperature of ℃ to obtain epoxy-nano titanium dioxide;
3) Grafting reaction
Epoxy-nano titanium dioxide and 0.5kg of amino-terminated hyperbranched polymer from preparation example 1 are mixed in 30L of toluene solvent, 30g of triethylamine catalyst is added to react for 7 hours at 90 ℃, after the reaction is finished, the mixture is centrifuged, and vacuum drying is carried out for 12 hours at 80 ℃ to obtain the nano titanium dioxide grafted amino-terminated hyperbranched polymer.
Preparation example 9
Unlike preparation 8, the amount of amino-terminated hyperbranched polymer used in preparation 9 was 0.7kg.
Preparation example 10
Unlike preparation 8, the amount of amino-terminated hyperbranched polymer used in preparation 10 was 0.8kg.
Preparation examples 11 to 13
Unlike preparation 8, the amino-terminated hyperbranched polymers in preparations 11 to 13 were derived from preparations 2 to 4, respectively.
Preparation examples 14 to 16
Unlike preparation 8, the amino-terminated hyperbranched polymers in preparation examples 14 to 16 were replaced with the same amount of the amino-terminated hyperbranched polymer derived from the grafted benzophenone of preparation examples 5 to 7, respectively.
Examples
Examples 1 to 3
A fabric ultraviolet absorber composition, which is prepared by the method comprising:
S1, mixing an ultraviolet absorbent, a dispersing agent, a defoaming agent and water according to the raw material ratio of the table 1 to obtain a pre-dispersion, wherein the dosage of the defoaming agent is 2/3 of the total amount of the defoaming agent;
S2, grinding the pre-dispersion liquid with the aid of a glass bead grinding medium, wherein the ratio of the glass beads to the pre-dispersion liquid is 1:3;
S3, adding residual defoaming agent after grinding, and centrifugally defoaming;
s4, filtering to remove the grinding medium to obtain suspension, and storing in a sealed and light-proof way.
Table 1 examples 1-3 raw materials proportioning Table (kg)
Wherein the dispersant is from preparation 8.
Examples 4 to 11
Unlike example 2, the dispersants in examples 4 to 11 are derived from preparation examples 9 to 16, respectively.
Example 12
Unlike example 2, in example 12, an equal amount of benzophenone was directly mixed as a raw material with an ultraviolet absorber.
Comparative example
Comparative example 1
Unlike example 1, the dispersant of comparative example 1 was an amino-terminated hyperbranched polymer obtained in preparation example 1.
Performance detection
The UPF values and ultraviolet transmittance of the ultraviolet absorbent compositions obtained in examples and comparative examples were examined with reference to "evaluation of ultraviolet resistance of textiles" GB/T18830-2009, the heat Chu Lijing D90 of the ultraviolet absorbent composition was tested after 20min in an 80 ℃ heat storage environment, the heat Chu Lijing D90 of the ultraviolet absorbent composition was again tested after 40min, and the D90 change rate was calculated, D90 change rate= |60minD90-20minD90|/20minD90 x 100%, and the results are shown in Table 2.
TABLE 2 Performance test results
Examples 1 to 12 and comparative example 1, in combination with Table 2, it can be seen that the obtained ultraviolet absorbent compositions of examples 1 to 12 are superior to comparative example 1 in UPF value, ultraviolet transmittance and thermal storage stability, which means that the obtained ultraviolet absorbent compositions of the present application are excellent in ultraviolet absorption effect and stable in thermal storage particle diameter.
As can be seen from the combination of example 1 and comparative example 1 and the combination of table 2, the difference between comparative example 1 and example 1 is the difference in dispersant, and the UPF value, the ultraviolet transmittance and the heat storage stability of the ultraviolet absorbent composition obtained in example 1 are all superior to those of comparative example 1, which means that the ultraviolet absorbent composition obtained in the present application is not only excellent in ultraviolet absorption effect but also stable in heat storage particle diameter. This indicates that the dispersant of the present application is superior in improving the absorption effect of the ultraviolet absorber and the thermal storage particle size stability. This is probably because the amino-terminated hyperbranched polymer grafted with nano titanium dioxide is used as a dispersing agent, the dispersing agent molecules are adsorbed on the surfaces of the ultraviolet absorbent particles, the particles are prevented from being aggregated due to collision in the heat storage process, the good dispersion state of the particles is maintained, meanwhile, the dispersing agent enables the particles to repel each other, the uniform dispersion of the particles is maintained, the surface tension between the ultraviolet absorbent and surrounding medium is reduced, the ultraviolet absorbent is better wetted by water, the bridge function is played between the ultraviolet absorbent and the water, the intermolecular interaction between the ultraviolet absorbent and the water is promoted, and the ultraviolet absorbent and the medium are better combined together. In the heat storage process, the phenomenon of phase separation or precipitation caused by incompatibility with a medium is avoided, the heat storage medium can be more uniformly dispersed in the medium when heated, the performance change caused by overhigh or overlow local concentration is reduced, and the heat storage stability is improved.
It can be seen in combination with examples 2 and 9-12, and with Table 2, that the use of benzophenone can enhance the ultraviolet absorption effect of the ultraviolet absorber, but grafting benzophenone onto the amino-terminated hyperbranched polymer can further enhance the thermal storage stability of the ultraviolet absorber.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (8)
1. The fabric ultraviolet absorbent composition is characterized by comprising the following raw materials, by weight, 20-50 parts of an ultraviolet absorbent, 6-13 parts of a dispersing agent, 0.3-0.8 part of a defoaming agent and 80-180 parts of water;
wherein the dispersing agent is an amino-terminated hyperbranched polymer grafted by nano titanium dioxide;
The preparation method of the nano titanium dioxide grafted amino-terminated hyperbranched polymer comprises the following steps:
1) Pretreatment of nano titanium dioxide
Carrying out surface treatment on the nano titanium dioxide by using sodium hydroxide solution, and introducing hydroxyl groups on the surface of the nano titanium dioxide to obtain hydroxyl-nano titanium dioxide;
2) Introduction of reactive groups
Using gamma-glycidol ether oxypropyl trimethoxy silane to react with hydroxyl-nano titanium dioxide, and introducing epoxy groups on the surface of the hydroxyl-nano titanium dioxide to obtain epoxy-nano titanium dioxide;
3) Grafting reaction
Mixing epoxy-nano titanium dioxide and an amino-terminated hyperbranched polymer in a solvent, reacting for 6-8 hours at 80-100 ℃ under the action of a catalyst, centrifuging and drying after the reaction is finished to obtain the nano titanium dioxide grafted amino-terminated hyperbranched polymer;
The weight ratio of the nano titanium dioxide to the amino-terminated hyperbranched polymer is 1 (0.5-0.7).
2. The fabric uv absorber composition of claim 1 wherein the amino-terminated hyperbranched polymer is prepared by:
a) Dissolving 3, 5-diaminobenzoic acid in a solvent to obtain a 3, 5-diaminobenzoic acid solution;
b) Adding a catalyst into the 3, 5-diaminobenzoic acid solution, then heating to 120-150 ℃, reacting for 7-9h, and removing water generated by the reaction through condensation and reflux in the reaction process;
c) Cooling the reaction system to 50-80 ℃, then adding ethylenediamine, and continuing to react for 30-45min to obtain a reactant solution;
d) And (3) dropwise adding the reaction product solution into an diethyl ether solvent to precipitate and separate out a polymer, and then filtering, washing and drying to obtain the amino-terminated hyperbranched polymer.
3. A fabric uv absorber composition according to claim 2, wherein the weight ratio of 3, 5-diaminobenzoic acid to ethylenediamine is 1 (0.3-0.7).
4. A fabric uv absorber composition according to claim 2, wherein said amino-terminated hyperbranched polymer has grafted thereon benzophenone by the grafting method of:
i. Adding amino-terminated hyperbranched polymer and glycidyl methacrylate into toluene solvent,
Adding a catalyst, reacting for 8-12 hours at 80-100 ℃, and introducing double bonds into the hyperbranched polymer to obtain a double bond-amino end capped hyperbranched polymer;
reacting benzophenone with acryloyl chloride in methylene dichloride in the presence of triethylamine, and introducing acryloyl on benzene ring of the benzophenone to obtain a benzophenone compound containing double bonds;
Mixing the double bond-amino end capped hyperbranched polymer ii obtained in the step i and the diphenyl ketone compound containing double bonds, adding the mixture into an organic solvent together with a free radical initiator, and carrying out free radical polymerization reaction at 60-80 ℃ in a protective gas atmosphere;
And iii, dialyzing and freeze-drying after the reaction is finished to obtain the amino-terminated hyperbranched polymer of the grafted benzophenone.
5. The fabric uv absorber composition of claim 4 wherein the weight ratio of benzophenone to amino terminated hyperbranched polymer is 1 (6-9).
6. The fabric UV absorber composition of claim 4 wherein the UV absorber is UV-326.
7. A process for preparing a fabric uv absorber composition according to any one of claims 1-6, comprising the steps of:
S1, mixing an ultraviolet absorbent, a dispersing agent, a defoaming agent and water to obtain pre-dispersed liquid, wherein the dosage of the defoaming agent is 1/2-2/3 of the total amount of the defoaming agent;
s2, grinding the pre-dispersed liquid with the aid of a grinding medium;
S3, adding residual defoaming agent after grinding, and centrifugally defoaming;
S4, filtering to remove the grinding medium to obtain a suspension, and storing in a sealed and light-proof manner.
8. The method of claim 7, wherein the grinding medium is glass beads, and the ratio of glass beads to the pre-dispersion is 1 (2-3) by volume.
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