Heat preservation down jacket fabric and preparation process

Abstract

The invention relates to the technical field of fabrics, and discloses a thermal-insulation down jacket fabric and a preparation process thereof. Hollow mesoporous titanium dioxide, 3-(dimethyl vinyl siloxane) glutaric acid, an acrylate monomer, an initiator and the like are subjected to a reaction to obtain a titanium dioxide-polyacrylate finishing liquid; and then carrying out two-time dipping and two-time rolling, pre-drying and baking on the down jacket fabric to obtain the heat preservation down jacket fabric. The hollow mesoporous titanium dioxide is uniformly dispersed in the polyacrylate film matrix, so that heat transfer can be prevented, the heat conductivity coefficient of the down jacket fabric is reduced, and good heat preservation and heat insulation performance is achieved. The polyacrylate finishing liquid contains flexible siloxane groups, so that a polyacrylate film is endowed with good flexibility, and the wrinkle recovery angle and the wrinkle resistance of the down jacket fabric are improved.

Description

Technical Field

[0001] This invention relates to the field of fabric technology, specifically to a thermal down jacket fabric and its manufacturing process. Background Technology

[0002] Down jacket fabrics mainly include polyester fiber fabrics and polyester-cotton fabrics. Down jacket fabrics are required to have windproof and warmth-retaining properties. While traditional polyester-cotton fabrics are durable, breathable, moisture-wicking, abrasion-resistant, and pill-resistant, their insulation performance is poor, hindering their practical application in down jackets and other thermal clothing. Applying finishing agents to the fabric can reduce its thermal conductivity and improve its insulation performance.

[0003] Common finishing agents include polyacrylates, silicones, and polyurethanes. Polyacrylate finishing agents adhere firmly, are not easily peeled off the fabric, and have good aging resistance. Silicone finishing agents can impart excellent softness and wrinkle resistance to fabrics. Nano-titanium dioxide is inexpensive and readily available, has excellent antibacterial and UV aging resistance, and porous titanium dioxide has a large number of porous structures and low thermal conductivity, which can improve the thermal insulation properties of materials. This invention aims to utilize porous titanium dioxide and silicone polyacrylate as finishing liquids to improve the thermal insulation and wrinkle resistance properties of fabrics. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention utilizes acrylic resin finishing agents to improve the heat retention, wrinkle resistance, and other properties of down jacket fabrics.

[0005] The technical solution of this invention is: a preparation process for thermal down jacket fabric: (1) Add water, hollow mesoporous titanium dioxide, and 3-(dimethylvinylsiloxane)glutaric acid to a container and stir to modify it. Then add water, acrylate monomer, emulsifier, and sodium bicarbonate and stir to obtain a monomer solution. 3-(dimethylvinylsiloxane)glutaric acid is used as both a surface modifier and a polymerization monomer for hollow mesoporous titanium dioxide.

[0006] (2) Nitrogen gas is introduced into the reaction vessel and the temperature is raised to the reaction temperature. While stirring, monomer solution and initiator solution are added dropwise to carry out the reaction. Then, monomer solution and initiator solution are added to continue the reaction. The product is cooled and discharged to obtain titanium dioxide-polyacrylate finishing solution. After the alkenyl group is introduced on the surface of titanium dioxide, it is then subjected to in-situ polymerization reaction with 3-(dimethylvinylsiloxane)glutaric acid, butyl acrylate, etc.

[0007] (3) Add down jacket fabric to titanium dioxide-polyacrylate finishing solution, adjust the bath ratio, and then perform two dips and two nips, pre-drying and baking to obtain thermal down jacket fabric.

[0008] Preferably, the temperature for stirring during modification in (1) is 80-90℃ and the time is 18-24h.

[0009] Preferably, in (1), the mass ratio of hollow mesoporous titanium dioxide, 3-(dimethylvinylsiloxane)glutaric acid, acrylate monomer and emulsifier is (0.8-2):(3-7):100:(2.7-3.6).

[0010] Preferably, in (1), the acrylate monomers include methyl methacrylate and butyl acrylate.

[0011] Preferably, the emulsifier in (1) includes OP-10 and sodium dodecyl sulfate.

[0012] Preferably, the initiator in (2) includes ammonium persulfate.

[0013] Preferably, in (2), the reaction temperature is 70-80℃; the reaction time is 40-60 min; and the reaction continues for 2-3 h.

[0014] Preferably, in (3), the bath ratio is 1:(30-50).

[0015] Preferably, in (3), the residual rate of the two dips and two rolls is 75-85%.

[0016] Preferably, the pre-drying temperature in (3) is 80-90℃ and the pre-drying time is 3-5min.

[0017] Preferably, the baking temperature in (3) is 150-160℃ and the baking time is 1.5-2.5min.

[0018] Preferably, the material of the down jacket fabric in (3) includes polyester-cotton blended fabric.

[0019] Preferably, the preparation process of 3-(dimethylvinylsiloxane)glutaric acid is as follows: In an ice-water bath, dichloromethane, triethylamine, dimethyl 3-hydroxyglutarate, and dimethylvinylchlorosilane in a molar ratio of (1-1.1):(1-1.1):1 are added to a reaction vessel. After stirring, the mixture is reacted at 20-30°C for 12-18 hours. After filtration, the filtrate is evaporated by rotary evaporation. Methanol and a 20-35% sodium hydroxide aqueous solution are added. The mixture is heated to 80-90°C and refluxed for 6-8 hours. Hydrochloric acid solution is added dropwise to adjust the pH to 3-4. The mixture is then filtered, and the precipitate is dried to obtain 3-(dimethylvinylsiloxane)glutaric acid.

[0020] The beneficial technical effects of this invention are as follows: 3-(dimethylvinylsiloxane)glutaric acid is used as both a surface modifier and a polymerization monomer for hollow mesoporous titanium dioxide. It contains hydrophilic carboxyl groups. After polymerization with monomers such as butyl acrylate, hydrophilic carboxyl groups are introduced into the polyacrylate molecular chain, which improves the water dispersibility and emulsion stability of polyacrylate.

[0021] The 3-(dimethylvinylsiloxane)glutaric acid of this invention contains multiple carboxyl groups, which form polydentate coordination bonds with the surface titanium atoms of hollow mesoporous titanium dioxide, achieving surface modification of titanium dioxide, reducing titanium dioxide agglomeration. Furthermore, after introducing alkenyl groups to the surface, it undergoes in-situ polymerization with 3-(dimethylvinylsiloxane)glutaric acid, butyl acrylate, etc., significantly improving the dispersibility of hollow mesoporous titanium dioxide in polyacrylate emulsions. Better dispersibility of the finishing solution results in better finishing effects on fabrics.

[0022] After the titanium dioxide-polyacrylate finishing solution of this invention is used to finish down jacket fabrics, the hollow mesoporous titanium dioxide is uniformly dispersed in the polyacrylate membrane matrix, which can prevent heat transfer, reduce the thermal conductivity of the down jacket fabric, and achieve good thermal insulation performance. Furthermore, the polyacrylate finishing solution contains flexible siloxane groups, which endow the polyacrylate membrane with good flexibility, improving the wrinkle recovery angle and wrinkle resistance of the down jacket fabric. Nano-titanium dioxide can also act as a UV absorber, improving the fabric's resistance to UV aging and other properties. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] The hollow mesoporous titanium dioxide model JK11-002-200 described below, with an average particle size of 200nm, is sourced from Nanjing Jike Biotechnology Co., Ltd. Example 1:

[0025] (1) In an ice-water bath, 60 mL of dichloromethane, 44 mmol of triethylamine, 44 mmol of dimethyl 3-hydroxyglutarate, and 40 mmol of dimethylvinylchlorosilane were added to a reaction vessel. After stirring, the mixture was reacted at 20 °C for 18 h. After filtration, the filtrate was evaporated by rotary evaporation. The crude product was added to 40 mL of methanol and 40 mL of 20% sodium hydroxide aqueous solution. The mixture was heated to 90 °C and refluxed for 6 h. The pH was adjusted to 3 by adding 25% hydrochloric acid solution dropwise. After filtration and drying of the precipitate, 3-(dimethylvinylsiloxane)glutaric acid was obtained. The preparation reaction formula is: .

[0026] (2) Add 30 mL of water, 0.8 g of hollow mesoporous titanium dioxide, and 3 g of 3-(dimethylvinylsiloxane)glutaric acid to the container, heat to 80 °C, stir and modify for 24 h, cool and add 350 mL of water, 31 g of methyl methacrylate, 69 g of butyl acrylate, 1.1 g of OP-10, and 2.2 g of sodium dodecyl sulfate. Add sodium bicarbonate to adjust the pH to 7 and stir to obtain a monomer solution.

[0027] (3) Nitrogen gas is introduced into the reaction vessel and the temperature is raised to 75°C. While stirring, 80 mL of the above monomer solution and 5 mL of aqueous solution containing 0.09 g of ammonium persulfate are added dropwise. The reaction is carried out for 40 min. Then, the remaining monomer solution is added and 15 mL of aqueous solution containing 0.38 g of ammonium persulfate is added. The reaction is carried out for 3 h. The product is cooled and discharged to obtain titanium dioxide-polyacrylate finishing solution.

[0028] (4) Add down jacket fabric (polyester-cotton blended fabric) to titanium dioxide-polyacrylate finishing solution, adjust the bath ratio to 1:40, and then perform two dips and two nips with a nip-residue rate of 85%; then pre-dry at 80℃ for 5 min, and finally bake at 155℃ for 2.5 min to obtain thermal down jacket fabric. Example 2:

[0029] (1) In an ice-water bath, add 50 mL of dichloromethane, 40 mmol of triethylamine, 40 mmol of dimethyl 3-hydroxyglutarate and 40 mmol of dimethylvinylchlorosilane to the reaction vessel. After stirring, react at 30 °C for 12 h. After filtration, evaporate the filtrate by rotary evaporation. Add 30 mL of methanol and 30 mL of 35% sodium hydroxide aqueous solution to the crude product. Heat to 80 °C and reflux for 8 h. Adjust the pH to 4 by adding 30% hydrochloric acid solution. Filter and dry the precipitate to obtain 3-(dimethylvinylsiloxane)glutaric acid.

[0030] (2) Add 60 mL of water, 1.4 g of hollow mesoporous titanium dioxide, and 5 g of 3-(dimethylvinylsiloxane)glutaric acid to the container, heat to 90 °C, stir and modify for 18 h, cool and add 400 mL of water, 26 g of methyl methacrylate, 74 g of butyl acrylate, 1.2 g of OP-10, and 2.4 g of sodium dodecyl sulfate. Add sodium bicarbonate to adjust the pH to 6.5 and stir to obtain a monomer solution.

[0031] (3) Nitrogen gas is introduced into the reaction vessel and the temperature is raised to 70°C. While stirring, 120 mL of the above monomer solution and 8 mL of aqueous solution containing 0.11 g of ammonium persulfate are added dropwise. The reaction is carried out for 60 min. Then, the remaining monomer solution is added and 15 mL of aqueous solution containing 0.45 g of ammonium persulfate is added. The reaction is carried out for 3 h. The product is cooled and discharged to obtain titanium dioxide-polyacrylate finishing solution.

[0032] (4) Add down jacket fabric (polyester-cotton blended fabric) to titanium dioxide-polyacrylate finishing solution, adjust the bath ratio to 1:30, then perform two dips and two nips, with a nip-out rate of 75%; then pre-dry at 90℃ for 3 min, and finally bake at 160℃ for 1.5 min to obtain thermal down jacket fabric. Example 3:

[0033] (1) Add 100 mL of water, 2 g of hollow mesoporous titanium dioxide, and 7 g of 3-(dimethylvinylsiloxane)glutaric acid (prepared according to the method of Example 1) to a container, heat to 90 °C, stir and modify for 24 h, cool and add 400 mL of water, 37 g of methyl methacrylate, 63 g of butyl acrylate, 0.9 g of OP-10, and 1.8 g of sodium dodecyl sulfate. Add sodium bicarbonate to adjust the pH to 7 and stir to obtain a monomer solution.

[0034] (2) Nitrogen gas is introduced into the reaction vessel and the temperature is raised to 80°C. While stirring, 80 mL of the above monomer solution and 5 mL of aqueous solution containing 0.08 g of ammonium persulfate are added dropwise. The reaction is carried out for 60 min. Then, the remaining monomer solution is added and 10 mL of aqueous solution containing 0.3 g of ammonium persulfate is added. The reaction is carried out for 2 h. The product is cooled and discharged to obtain titanium dioxide-polyacrylate finishing solution.

[0035] (3) Add down jacket fabric (polyester-cotton blended fabric) to titanium dioxide-polyacrylate finishing solution, adjust the bath ratio to 1:50, then perform two dips and two nips, with a nip-out rate of 80%; then pre-dry at 80℃ for 4 min, and finally bake at 150℃ for 2.5 min to obtain thermal down jacket fabric.

[0036] Comparative Example 1: (1) Add 3g of 3-(dimethylvinylsiloxane)glutaric acid, 380mL of water, 31g of methyl methacrylate, 69g of butyl acrylate, 1.1g of OP-10, and 2.2g of sodium dodecyl sulfate to a container, add sodium bicarbonate to adjust the pH to 7, and stir to obtain a monomer solution.

[0037] (2) Nitrogen gas is introduced into the reaction vessel and the temperature is raised to 75°C. While stirring, 80 mL of the above monomer solution and 5 mL of aqueous solution containing 0.09 g of ammonium persulfate are added dropwise. The reaction is carried out for 40 min. Then, the remaining monomer solution is added and 15 mL of aqueous solution containing 0.38 g of ammonium persulfate is added. The reaction is carried out for 3 h. The product is cooled and discharged to obtain polyacrylate finishing solution.

[0038] (3) Add down jacket fabric (polyester-cotton blended fabric) to polyacrylate finishing solution, adjust the bath ratio to 1:40, then perform two dips and two nips, with a nip-out rate of 85%; then pre-dry at 80℃ for 5 min, and finally bake at 155℃ for 2.5 min to obtain down jacket fabric.

[0039] Comparative Example 2: (1) Add 0.8g hollow mesoporous titanium dioxide, 380mL water, 31g methyl methacrylate, 69g butyl acrylate, 1.1g OP-10, and 2.2g sodium dodecyl sulfate to a container, add sodium bicarbonate to adjust the pH to 7, and stir to obtain a monomer solution.

[0040] (2) Nitrogen gas was introduced into the reaction vessel and the temperature was raised to 75°C. While stirring, 80 mL of the above monomer solution and 5 mL of aqueous solution containing 0.09 g of ammonium persulfate were added dropwise. The reaction was carried out for 40 min. Then, the remaining monomer solution was added and 15 mL of aqueous solution containing 0.38 g of ammonium persulfate was added. The reaction was carried out for 3 h. The product was cooled and discharged to obtain titanium dioxide-polyacrylate finishing solution.

[0041] (3) Add down jacket fabric (polyester-cotton blended fabric) to titanium dioxide-polyacrylate finishing solution, adjust the bath ratio to 1:40, and then perform two dips and two nips with a nip-residue rate of 85%; then pre-dry at 80℃ for 5 min, and finally bake at 155℃ for 2.5 min to obtain thermal down jacket fabric.

[0042] Comparative Example 3: (1) Add 30 mL of water, 0.8 g of hollow mesoporous titanium dioxide and 3 g of methacrylic acid to a container, heat to 80 °C, stir and modify for 24 h, cool and add 350 mL of water, 31 g of methyl methacrylate, 69 g of butyl acrylate, 1.1 g of OP-10 and 2.2 g of sodium dodecyl sulfate, add sodium bicarbonate to adjust the pH to 7, and stir to obtain a monomer solution.

[0043] (2) Nitrogen gas was introduced into the reaction vessel and the temperature was raised to 75°C. While stirring, 80 mL of the above monomer solution and 5 mL of aqueous solution containing 0.09 g of ammonium persulfate were added dropwise. The reaction was carried out for 40 min. Then, the remaining monomer solution was added and 15 mL of aqueous solution containing 0.38 g of ammonium persulfate was added. The reaction was carried out for 3 h. The product was cooled and discharged to obtain titanium dioxide-polyacrylate finishing solution.

[0044] (3) Add down jacket fabric (polyester-cotton blended fabric) to titanium dioxide-polyacrylate finishing solution, adjust the bath ratio to 1:40, and then perform two dips and two nips with a nip-residue rate of 85%; then pre-dry at 80℃ for 5 min, and finally bake at 155℃ for 2.5 min to obtain thermal down jacket fabric.

[0045] Comparative Example 4: (1) Add 30 mL of water, 0.8 g of hollow mesoporous titanium dioxide and 3 g of vinyltrimethoxysilane to a container, heat to 80 °C, stir and modify for 24 h, cool and add 350 mL of water, 31 g of methyl methacrylate, 69 g of butyl acrylate, 1.1 g of OP-10 and 2.2 g of sodium dodecyl sulfate, add sodium bicarbonate to adjust the pH to 7, and stir to obtain a monomer solution.

[0046] (2) Nitrogen gas was introduced into the reaction vessel and the temperature was raised to 75°C. While stirring, 80 mL of the above monomer solution and 5 mL of aqueous solution containing 0.09 g of ammonium persulfate were added dropwise. The reaction was carried out for 40 min. Then, the remaining monomer solution was added and 15 mL of aqueous solution containing 0.38 g of ammonium persulfate was added. The reaction was carried out for 3 h. The product was cooled and discharged to obtain titanium dioxide-polyacrylate finishing solution.

[0047] (3) Add down jacket fabric (polyester-cotton blended fabric) to titanium dioxide-polyacrylate finishing solution, adjust the bath ratio to 1:40, and then perform two dips and two nips with a nip-residue rate of 85%; then pre-dry at 80℃ for 5 min, and finally bake at 155℃ for 2.5 min to obtain thermal down jacket fabric.

[0048] Comparative Example 5: (1) Add 30 mL of water, 0.8 g of hollow mesoporous titanium dioxide, 1.5 g of methacrylic acid, and 1.5 g of vinyltrimethoxysilane to a container, heat to 80 °C, stir and modify for 24 h, cool and add 350 mL of water, 31 g of methyl methacrylate, 69 g of butyl acrylate, 1.1 g of OP-10, and 2.2 g of sodium dodecyl sulfate. Add sodium bicarbonate to adjust the pH to 7 and stir to obtain a monomer solution.

[0049] (2) Nitrogen gas was introduced into the reaction vessel and the temperature was raised to 75°C. While stirring, 80 mL of the above monomer solution and 5 mL of aqueous solution containing 0.09 g of ammonium persulfate were added dropwise. The reaction was carried out for 40 min. Then, the remaining monomer solution was added and 15 mL of aqueous solution containing 0.38 g of ammonium persulfate was added. The reaction was carried out for 3 h. The product was cooled and discharged to obtain titanium dioxide-polyacrylate finishing solution.

[0050] (3) Add down jacket fabric (polyester-cotton blended fabric) to titanium dioxide-polyacrylate finishing solution, adjust the bath ratio to 1:40, and then perform two dips and two nips with a nip-residue rate of 85%; then pre-dry at 80℃ for 5 min, and finally bake at 155℃ for 2.5 min to obtain thermal down jacket fabric.

[0051] The finishing solution was left at room temperature for 30 days to observe its stability.

[0052] The thermal conductivity of down jacket fabric was tested using a transient plane heat source thermal conductivity meter.

[0053] The wrinkle recovery angle of the fabric was tested according to GBT 3819-1997 standard.

[0054] Table 1 Fabric Performance

[0055] After testing, the titanium dioxide-polyacrylate finishing solutions prepared in Examples 1-3 showed that the emulsions were clear and transparent without precipitation after storage. This is mainly because 3-(dimethylvinylsiloxane)glutaric acid contains hydrophilic carboxyl groups. After polymerization with monomers such as butyl acrylate, hydrophilic carboxyl groups are introduced into the polyacrylate molecular chain, improving the water dispersibility and emulsion stability of the polyacrylate. The finishing solution contains no gel-like substances. Furthermore, 3-(dimethylvinylsiloxane)glutaric acid contains multiple carboxyl groups, which form polydentate coordination bonds with the surface titanium atoms of hollow mesoporous titanium dioxide, achieving surface modification of titanium dioxide. After introducing alkenyl groups to the surface, the in-situ polymerization with 3-(dimethylvinylsiloxane)glutaric acid, butyl acrylate, etc., significantly improves the dispersibility of hollow mesoporous titanium dioxide in the polyacrylate emulsion, resulting in no precipitation in the finishing solution. The better the dispersibility of the finishing solution, the better the finishing effect on the fabric. After the finishing solution is applied to the down jacket fabric, the hollow mesoporous titanium dioxide is uniformly dispersed in the polyacrylate membrane matrix, which can prevent heat transfer, reduce the thermal conductivity of the down jacket fabric, and provide good thermal insulation performance. Furthermore, the polyacrylate finishing solution contains flexible siloxane groups, which endow the polyacrylate membrane with good flexibility, improving the wrinkle recovery angle and wrinkle resistance of the down jacket fabric.

[0056] In Comparative Example 1, the polyacrylate finishing solution did not contain hollow mesoporous titanium dioxide, resulting in a high thermal conductivity and poor warmth retention of the down jacket fabric.

[0057] Comparative Example 2 did not include 3-(dimethylvinylsiloxane)glutaric acid, and the prepared polyacrylate did not contain hydrophilic carboxyl groups, resulting in poor water dispersibility. The finishing solution contained polyacrylate gel-like substances, and the hollow mesoporous titanium dioxide was not surface modified, so it could not undergo in-situ polymerization with acrylate monomers. This led to poor dispersibility of hollow mesoporous titanium dioxide in the polyacrylate finishing solution, with obvious titanium dioxide precipitates. The storage stability of the finishing solution was very poor, resulting in poor finishing effect on the fabric. Furthermore, the polyacrylate did not contain flexible siloxane groups, resulting in poor flexibility of the polyacrylate film, which led to a low wrinkle recovery angle and poor wrinkle resistance of the down jacket fabric.

[0058] Comparative Example 3, containing only one carboxyl group, showed poor surface modification effect on hollow mesoporous titanium dioxide. The hollow mesoporous titanium dioxide exhibited poor dispersibility in polyacrylate emulsions, resulting in a small amount of titanium dioxide precipitate in the finishing solution. The finishing solution also exhibited poor storage stability and a poor finishing effect on the fabric. Furthermore, the finished fabric had a high thermal conductivity and poor insulation performance. Additionally, the polyacrylate lacked flexible siloxane groups, leading to poor flexibility in the polyacrylate film, resulting in a low wrinkle recovery angle and poor wrinkle resistance in the down jacket fabric.

[0059] The vinyltrimethoxysilane in Comparative Example 4 does not contain a carboxyl group, resulting in poor water dispersibility of polyacrylate, the presence of polyacrylate gel-like substances in the finishing solution, poor storage stability, poor finishing effect on fabrics, and a high thermal conductivity and low wrinkle recovery angle.

[0060] Comparative Example 5 simultaneously added methacrylic acid and vinyltrimethoxysilane (total amount 3g) to replace 3-(dimethylvinylsiloxane)glutaric acid (amount 3g), resulting in a higher thermal conductivity than Example 1 and a significantly lower wrinkle recovery angle.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A manufacturing process for a thermal down jacket fabric, characterized in that, The preparation process includes the following steps: (1) Add water, hollow mesoporous titanium dioxide, and 3-(dimethylvinylsiloxane)glutaric acid to a container, stir to modify, and then add water, acrylate monomer, emulsifier, and sodium bicarbonate, and stir to obtain a monomer solution. (2) Nitrogen gas is introduced into the reaction vessel and the temperature is raised to the reaction temperature. While stirring, monomer solution and initiator solution are added dropwise to carry out the reaction. Then, monomer solution and initiator solution are added to continue the reaction. The product is cooled and discharged to obtain titanium dioxide-polyacrylate finishing solution. (3) Add down jacket fabric to titanium dioxide-polyacrylate finishing solution, adjust the bath ratio, and then perform two dips and two nips, pre-drying and baking to obtain thermal down jacket fabric.

2. The preparation process of the thermal down jacket fabric according to claim 1, characterized in that, The temperature for stirring during the modification process in (1) is 80-90℃ and the time is 18-24h.

3. The preparation process of the thermal down jacket fabric according to claim 1, characterized in that, The reaction temperature in (2) is 70-80℃; the reaction time is 40-60 min; and the reaction continues for 2-3 h.

4. The preparation process of the thermal down jacket fabric according to claim 1, characterized in that, The mass ratio of the hollow mesoporous titanium dioxide, 3-(dimethylvinylsiloxane)glutaric acid, acrylate monomer, and emulsifier is (0.8-2):(3-7):100:(2.7-3.6).

5. The preparation process of the thermal down jacket fabric according to claim 4, characterized in that, The acrylate monomers include any one or a combination of methyl methacrylate and butyl acrylate; the emulsifiers include any one or a combination of OP-10 and sodium dodecyl sulfate; and the initiator includes ammonium persulfate.

6. The preparation process of the thermal down jacket fabric according to claim 4, characterized in that, The preparation process of 3-(dimethylvinylsiloxane)glutaric acid is as follows: In an ice-water bath, dichloromethane, triethylamine, dimethyl 3-hydroxyglutarate, and dimethylvinylchlorosilane in a molar ratio of (1-1.1):(1-1.1):1 are added to a reaction vessel. After stirring, the mixture is reacted at 20-30℃ for 12-18 hours. After filtration, the filtrate is evaporated by rotary evaporation. Methanol and a 20-35% sodium hydroxide aqueous solution are added. The mixture is heated to 80-90℃ and refluxed for 6-8 hours. Hydrochloric acid solution is added dropwise to adjust the pH to 3-4. The mixture is then filtered, and the precipitate is dried to obtain 3-(dimethylvinylsiloxane)glutaric acid.

7. The preparation process of the thermal down jacket fabric according to claim 1, characterized in that, In step (3), the bath ratio is 1:(30-50); the roll residue after two dips and two rolls is 75-85%.

8. The preparation process of the thermal down jacket fabric according to claim 1, characterized in that, The pre-drying temperature in (3) is 80-90℃ and the pre-drying time is 3-5 min; the baking temperature is 150-160℃ and the baking time is 1.5-2.5 min.

9. The preparation process of the thermal down jacket fabric according to claim 1, characterized in that, The material of the down jacket fabric includes polyester-cotton blended fabric.

10. A thermal down jacket fabric obtained by the preparation process according to any one of claims 1-9.

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