Down jacket waterproof coating and preparation process thereof

Abstract

The invention provides a waterproof coating of a down jacket and a preparation process of the waterproof coating, and relates to the field of textile coatings. The temperature-sensitive antibacterial fabric sequentially comprises a hydrophobic layer, a temperature-sensitive layer, a self-sealing layer and an antibacterial layer from outside to inside, the hydrophobic layer is prepared from the following raw materials in parts by weight: 60 to 80 parts of polydimethylsiloxane, 10 to 20 parts of methyltrimethoxysilane, 10 to 15 parts of hydroxylated graphene and 10 to 15 parts of compound wax; the temperature-sensitive layer comprises the following components in parts by weight: 20-30 parts of a polyurethane skeleton and 10-20 parts of a thermal shrinkage and cold expansion agent; the self-sealing layer comprises the following components in parts by weight: 20-30 parts of a macroporous silicon dioxide skeleton and 10-20 parts of a water absorption expanding agent; the antibacterial isolation layer is prepared from 70-80 parts of polytetrafluoroethylene fibers, 10-15 parts of tourmaline powder and 8-10 parts of nano-silver sol. The temperature-sensitive layer and the self-sealing layer form a temperature control switch, in a low-temperature and high-humidity state, the temperature-sensitive layer shrinks to reduce heat loss, and the self-sealing layer expands to block water. In a high-temperature and low-humidity state, the temperature-sensitive layer expands and is breathable, and the self-sealing layer keeps pores for perspiration.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of textile coating, in particular, to a waterproof coating for down jackets and a preparation process thereof. BACKGROUND

[0002] The waterproof coating for down jackets is formed by physical or chemical means on the surface of the fabric, and its core function is to prevent water penetration while maintaining air permeability to ensure the warmth retention and wearing comfort of the down jacket.

[0003] The waterproof coating forms a continuous film or a microporous structure on the surface of the fabric by coating high molecular compounds such as polyurethane, polytetrafluoroethylene, etc., and realizes the waterproof function by using the principles of hydrophobicity and air permeability: hydrophobicity: the coating material (such as fluorine-containing or silicon-based compounds) makes water droplets roll off by high surface tension, reducing water penetration. Air permeability: the microporous structure allows water vapor to be discharged, avoiding the accumulation of internal moisture and maintaining dryness and comfort.

[0004] Common waterproof coatings include polyurethane (PU) coating, Teflon coating, silicone coating, etc. The polyurethane (PU) coating has a mature process and is suitable for large-scale production. It has reliable basic waterproof performance and is resistant to chemical corrosion. However, it has poor air permeability: it is prone to heat and may crack after long-term use. It has poor environmental friendliness: it contains solvents and is difficult to recycle and process. The Teflon coating has a smooth surface and is easy to clean, and is resistant to high temperatures. However, it contains harmful substances such as PFOA, which has been gradually restricted, and has a stiff feel, affecting the wearing comfort. The silicone coating has a natural feel close to natural fabrics and good environmental friendliness. It is strong and suitable for outdoor scenes. However, it has poor wear resistance and is easily scratched by sharp objects. It has high cost and complex process, and is expensive. Nano waterproof coating: high-efficiency waterproof, can form a nanoscale dense film without affecting warmth retention. Fluoride-free, improved washability. However, it has high cost, requires nanoscale spraying equipment, and has complex process and may be affected by long-term ultraviolet exposure. Hydrophobic and oleophobic coating: waterproof and oil-repellent, resistant to acid rain and other harsh environments. Easy to clean, stains can be wiped off. However, it has poor durability, performance degradation after multiple washes, high cost, and high price due to functional combination. Multi-layer composite coating: strong comprehensive performance: waterproof, air permeable, and wear-resistant, PU outer layer + nanometer film inner layer composite, prolonging service life. However, it has complex process, high production cost, and increased thickness affecting lightweight. Bio-based / phytoextracted coating: aloe vera, flavonoid mixture, environmentally friendly and sustainable. It also has antibacterial function. However, it has weak waterproofness and needs to be combined with other technologies.

[0005] Therefore, there is an urgent need to provide a fluoride-free, environmentally friendly, and comfortable waterproof coating for down jackets. SUMMARY

[0006] The present application aims to provide a waterproof coating for down jackets, which has temperature and humidity regulation, and has waterproof and breathable properties.

[0007] Another object of the present application is to provide a preparation process of the waterproof coating for down jackets, which is firmly combined with the fabric substrate through batch coating and gradient curing.

[0008] The present application solves the technical problems by using the following technical solutions.

[0009] In one aspect, the present application provides a waterproof coating for down jackets, which comprises, from outside to inside, a hydrophobic layer, a temperature-sensitive layer, a self-sealing layer and an antibacterial layer.

[0010] Hydrophobic layer: polydimethylsiloxane 60-80 parts, hydroxylated graphene 10-15 parts, and compound waxy 10-15 parts.

[0011] Temperature-sensitive layer: polyurethane skeleton 20-30 parts, thermal shrinkage and cold expansion agent 10-20 parts.

[0012] Self-sealing layer: macroporous silica skeleton 20-30 parts, water-absorbing and swelling agent 10-20 parts.

[0013] Antibacterial isolation layer: polytetrafluoroethylene fiber 70-80 parts, tourmaline powder 10-15 parts, and nano-silver sol 8-10 parts.

[0014] In some embodiments of the present application, the compound waxy includes octadecyl trimethoxysilane, alumina gel, and alginic acid, and the mass ratio of the three is 1:1.8:1.5.

[0015] In some embodiments of the present application, the thermal shrinkage and cold expansion agent includes polytetrafluoroethylene, silicone rubber, antimony oxide, and cerium tungstate, and the mass ratio is 1:1:3:3.

[0016] In some embodiments of the present application, the water-absorbing and swelling agent includes modified bentonite and alginic acid, and the mass ratio is 8:1.

[0017] In some embodiments of the present application, the modified bentonite is prepared by the following method,

[0018] The bentonite is dried in a 100-105℃ oven for 4 hours, crushed and sieved through a 400 mesh sieve; then the bentonite, silane coupling agent and deionized water are added in a reaction kettle, stirred at 300 r / min to form a suspension, anhydrous ethanol is added, the temperature is raised to 65±5℃, and constant temperature stirring is carried out for 6 hours; then the product suspension is filtered through a Buchner funnel, washed with deionized water until the filtrate pH = 7, and the filter cake is dried at 80℃ under vacuum for 12 hours to obtain silanized bentonite particles; the silanized particles are mixed with molten paraffin at 50-60℃, and are ground in a ball mill with zirconia balls as the medium (ball-to-material ratio 10:1) at 400 r / min for 2 hours, sieved through a 500 mesh sieve, to obtain nano-sized modified bentonite.

[0019] In another aspect, the present application provides a preparation process of a waterproof coating for down jackets, comprising the following steps:

[0020] S1, polytetrafluoroethylene fibers and tourmaline powder are added to a high-speed disperser, stirred at 2000 r / min for 15 min, and nano-silver sol is slowly added and stirred for another 30 min; then modified hydroxypropyl methyl cellulose is added to form a paste, to obtain an antibacterial layer precursor;

[0021] S2, macroporous silica is dispersed in deionized water, modified bentonite and alginic acid are added, and ultrasonic treatment is carried out at 90℃ water bath and 280W for 40 min (frequency 65 kHz); then evaporation is carried out until the consistency is 40 mm, and cooling is carried out to 25℃; finally, a binder is added and stirred for 20 min to obtain a self-sealing layer precursor;

[0022] S3, polyurethane framework is premixed with thermal shrinkage and cold expansion agent, stirred at 700 r / min for 30 min, and acrylic emulsion is added and stirred for 15 min to obtain a temperature-sensitive layer precursor;

[0023] S4, polydimethylsiloxane, methyltrimethoxysilane and hydroxylated graphene are mixed and ultrasonically dispersed, compounded waxy and defoaming agent are added, and stirred at 1500 r / min for 1 hour to obtain a hydrophobic layer precursor;

[0024] S5, the antibacterial layer precursor is coated on the surface of the fabric, dried at 50-60℃ for 2-3 min; then the self-sealing layer precursor is sprayed, dried at 65-70℃ for 2-3 min; then the temperature-sensitive layer precursor is electrostatically sprayed, dried at 80-85℃ for 1-2 min; and finally, the hydrophobic layer precursor is coated, dried at 110-120℃ for 4-5 min; thus the waterproof coating is obtained.

[0025] In some embodiments of the present application, the coating thickness of the antibacterial layer precursor is 20-25um.

[0026] In some embodiments of the present application, the spraying thickness of the self-sealing layer precursor is 10-15um.

[0027] In some embodiments of the application, the spray thickness of the temperature-sensitive layer precursor is 20-25 um.

[0028] In some embodiments of the application, the coating thickness of the hydrophobic layer is 15-20 um.

[0029] Compared with the prior art, the embodiments of the application have at least the following advantages or benefits:

[0030] The waterproof coating provided by the application comprises, from the outside to the inside, a hydrophobic layer, a temperature-sensitive layer, a self-sealing layer and an antibacterial layer, wherein the hydrophobic layer comprises polydimethylsiloxane (60-80 parts), hydroxylated graphene (10-15 parts), and a compound wax (10-15 parts, containing octadecyltrimethoxysilane, alumina gel, and alginic acid, with a mass ratio of 1:1.8:1.5). After ultrasonic dispersion, high-speed stirring (1500 r / min, 1 hour) is performed. The hydrophobic layer has high hydrophobicity: octadecylsilane and polydimethylsiloxane cooperate to make the contact angle of the hydrophobic layer > 160° and the rolling angle < 10°, achieving a "self-cleaning" effect (water beads carrying dirt roll off). The hydroxylated graphene forms a conductive path in the polydimethylsiloxane network, and the surface resistance is reduced to 10 6 Ω, reducing electrostatic adsorption of dust and providing stain resistance for the hydrophobic layer. Anti-icing property: the alumina gel nanoparticles reduce the adhesion of ice crystals, and the icing delay time is extended by 3 times at -20℃. Natural antibacterial property: the alginic acid releases fucoidan, with an inhibition rate of > 80% on Staphylococcus aureus, reducing the use of chemical antibacterial agents. Wear-resistant enhancement: the hydroxylated graphene improves the hardness of the coating (pencil hardness ≥ 3H) through chemical bonding, reducing friction loss. It also has a self-cleaning function: the silane compounds in the compound wax reduce dirt adhesion, and the alumina gel enhances the ultraviolet resistance.

[0031] The temperature-sensitive layer comprises a polyurethane skeleton (20-30 parts), a thermal shrinkage and cold expansion agent (polytetrafluoroethylene, silicone rubber, antimony oxide, and cerium tungstate, with a mass ratio of 1:1:3:3). After premixing, an acrylic emulsion is added and stirred (700 r / min, 30 min). At low temperatures (< 10℃), the thermal shrinkage and cold expansion agent shrinks, and the polyurethane skeleton densifies, reducing heat loss (the thermal conductivity is reduced by 30%). At high temperatures (> 25℃), the silicone rubber elastically expands to form micro-channels (pore size 5-10 um), allowing water vapor to escape (moisture permeability ≥ 8000 g / m 2 / 24h). The antimony oxide and cerium tungstate cooperate to improve the high-temperature resistance (not decomposed at 300℃) and flame retardancy (UL94 V-0 level).

[0032] The self-sealing layer includes macroporous silica (20-30 parts), modified bentonite (8:1 alginic acid). After ultrasonic treatment (65 kHz, 280 W, 40 min), the binder is added. It can achieve dynamic waterproofing, that is, in the dry state, macroporous silica (pore size 50-100 nm) allows water vapor to pass through (moisture permeability ≥5000 g / m 2 / 24h). In the wet state, the modified bentonite swells by 300% in volume after absorbing water, sealing the pores (water pressure resistance ≥10000 mm H2O). The bentonite is combined with alginic acid, which accelerates the water absorption rate, which is better than traditional bentonite.

[0033] The antibacterial layer includes polytetrafluoroethylene fiber (70-80 parts), tourmaline powder (10-15 parts), and nano-silver sol (8-10 parts). After high-speed dispersion (2000 r / min, 15 min), the modified hydroxypropyl methyl cellulose is added. It has long-term antibacterial properties: nano-silver sol (particle size 5-10 nm) releases Ag + , with an inhibition rate of >99.9% for Staphylococcus aureus and Escherichia coli.

[0034] The waterproof coating provided by the present application forms a temperature-controlled switch between the temperature-sensitive layer and the self-sealing layer. In a low-temperature and high-humidity state: the temperature-sensitive layer shrinks to reduce heat loss, and the self-sealing layer swells to block water. In a high-temperature and low-humidity state: the temperature-sensitive layer expands to allow air to pass through, and the self-sealing layer maintains the pores to allow sweat to pass through. DETAILED DESCRIPTION

[0035] To make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below. If specific conditions are not specified in the embodiments, conventional conditions or manufacturer-recommended conditions are used. If the manufacturers of the reagents or instruments used are not specified, they are all conventional products that can be purchased on the market.

[0036] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to specific embodiments.

[0037] The waterproof coating for down jackets provided by the embodiments of the present application includes, from the outside to the inside, a hydrophobic layer, a temperature-sensitive layer, a self-sealing layer and an antibacterial layer; the hydrophobic layer includes the following raw materials by weight fraction:

[0038] The hydrophobic layer: polydimethylsiloxane 60-80 parts, methyltrimethoxysilane 10-20 parts, hydroxylated graphene 10-15 parts, and compounded waxy 10-15 parts; the compounded waxy includes octadecyltrimethoxysilane, alumina gel and alginic acid, and the mass ratio of the three is 1:1.8:1.5.

[0039] Temperature sensitive layer: polyurethane skeleton 20-30 parts, thermal shrinkage and cold expansion agent 10-20 parts; thermal shrinkage and cold expansion agent includes polytetrafluoroethylene, silicone rubber, antimony oxide, cerium tungstate, and the mass ratio is 1:1:3:3.

[0040] Self-sealing layer: macroporous silica skeleton 20-30 parts, water-absorbing expansion agent 10-20 parts; water-absorbing expansion agent includes modified bentonite and alginic acid, and the mass ratio is 8:1;

[0041] Antibacterial isolation layer: polytetrafluoroethylene fiber 70-80 parts, tourmaline powder 10-15 parts, nano silver sol 8-10 parts.

[0042] The modified bentonite is prepared as follows: the bentonite is dried in an oven at 100-105℃ for 4 hours, crushed and sieved through a 400 mesh sieve; then the bentonite, silane coupling agent and deionized water are added in a reaction kettle to form a suspension under stirring at 300r / min, and then anhydrous ethanol is added, the temperature is raised to 65±5℃, and constant temperature stirring is carried out for 6 hours; then the product suspension is filtered through a Buchner funnel, washed with deionized water until the filtrate pH=7, and the filter cake is dried at 80℃ under vacuum for 12 hours to obtain silanized bentonite particles; at 50-60℃, the silanized particles are mixed with molten paraffin, and in a ball mill, zirconium oxide balls are used as medium (ball to material ratio 10:1), and grinding is carried out at 400r / min for 2 hours, and then sieved through a 500 mesh sieve to obtain nano-sized modified bentonite.

[0043] The preparation process of the waterproof coating includes the following steps:

[0044] S1, polytetrafluoroethylene fiber and tourmaline powder are added to a high-speed disperser, stirred at 2000r / min for 15min, nano silver sol is slowly added, and stirring is continued for 30min, modified hydroxypropyl methyl cellulose is added, and a paste is prepared to obtain an antibacterial layer precursor;

[0045] S2, macroporous silica is dispersed in deionized water, modified bentonite and alginic acid are added, and ultrasonic treatment is carried out at 90℃ water bath, 280W for 40min (frequency 65kHz), and then evaporated to a consistency of 40mm, cooled to 25℃, and then a binder is added and stirred for 20min to obtain a self-sealing layer precursor;

[0046] S3, polyurethane skeleton is premixed with thermal shrinkage and cold expansion agent, stirred at 700r / min for 30min, and then acrylic emulsion is added and stirred for 15min to obtain a temperature sensitive layer precursor;

[0047] S4, polydimethylsiloxane, methyltrimethoxysilane and hydroxylated graphene are mixed and ultrasonically dispersed, and then compounded wax and defoaming agent are added, and stirring is carried out at 1500r / min for 1 hour to obtain a hydrophobic layer precursor;

[0048] S5, coating the antibacterial layer precursor on the surface of the fabric, drying at 50-60℃ for 2-3min; then spraying the self-sealing layer precursor, drying at 65-70℃ for 2-3min; then electrostatic spraying the temperature-sensitive layer precursor, drying at 80-85℃ for 1-2min; then coating the hydrophobic layer precursor, drying at 110-120℃ for 4-5min; thus obtaining the waterproof coating.

[0049] The coating thickness of the antibacterial layer precursor is 20-25um. The spraying thickness of the self-sealing layer precursor is 10-15um. The spraying thickness of the temperature-sensitive layer precursor is 20-25um. The coating thickness of the hydrophobic layer is 15-20um.

[0050] The features and performances of the present application are further described in detail in the following combined with examples.

[0051] Example 1

[0052] Prepare the raw materials of each layer according to the following proportioning:

[0053] Hydrophobic layer: polydimethylsiloxane 80 parts, methyltrimethoxysilane 20 parts, hydroxylated graphene 15 parts, and compound waxy 15 parts; the compound waxy includes octadecyltrimethoxysilane, alumina gel, and alginic acid, and the mass ratio of the three is 1:1.8:1.5.

[0054] Temperature-sensitive layer: polyurethane skeleton 30 parts, thermal shrinkage and cold expansion agent 20 parts; the thermal shrinkage and cold expansion agent includes polytetrafluoroethylene, silicone rubber, antimony oxide, and cerium tungstate, and the mass ratio is 1:1:3:3.

[0055] Self-sealing layer: macroporous silica skeleton 30 parts, water-absorbing expansion agent 20 parts; the water-absorbing expansion agent includes modified bentonite and alginic acid, and the mass ratio is 8:1;

[0056] Antibacterial isolation layer: polytetrafluoroethylene fiber 70 parts, tourmaline powder 15 parts, and nano-silver sol 10 parts.

[0057] Among them, the sources and models of each raw material are shown in Table 1:

[0058] Table 1

[0059]

[0060]

[0061] Based on the above proportioning, the waterproof coating of the present example is prepared according to the following method:

[0062] S1, polytetrafluoroethylene fiber, tourmaline powder were added into a high-speed disperser, stirred at 2000 r / min for 15 min, and then nano-silver sol was slowly added and stirred for another 30 min. Modified hydroxypropyl methyl cellulose was added to form a paste, and an antibacterial layer precursor was obtained;

[0063] S2, bentonite was dried in an oven at 105°C for 4 hours, crushed and sieved through a 400 mesh sieve. Then, bentonite, silane coupling agent and deionized water were added into a reaction kettle and stirred at 300 r / min to form a suspension. Anhydrous ethanol was then added, and the temperature was raised to 65±5°C. The suspension was stirred at constant temperature for 6 hours. The product suspension was then filtered through a Buchner funnel, washed with deionized water until the filtrate pH was 7. The filter cake was dried at 80°C under vacuum for 12 hours to obtain silanized bentonite particles. The silanized particles were mixed with molten paraffin at 60°C, and then ground in a ball mill using zirconia balls as the medium (ball-to-material ratio of 10:1) at 400 r / min for 2 hours. The mixture was sieved through a 500 mesh sieve to obtain nano-sized modified bentonite.

[0064] Macroporous silica was dispersed in deionized water, and modified bentonite and alginic acid were added. The mixture was treated with ultrasonic waves at 90°C water bath and 280W for 40 min (frequency 65 kHz). The mixture was evaporated to a consistency of 40 mm and cooled to 25°C. A binder was added and stirred for 20 min to obtain a self-sealing layer precursor.

[0065] S3, the polyurethane skeleton was pre-mixed with a thermal shrinkage and cold expansion agent, and stirred at 700 r / min for 30 min. Acrylic emulsion was added and stirred for 15 min to obtain a temperature-sensitive layer precursor.

[0066] S4, polydimethylsiloxane and hydroxylated graphene were mixed and ultrasonically dispersed. Compound waxy and defoaming agent were added and stirred at 1500 r / min for 1 hour to obtain a hydrophobic layer precursor.

[0067] S5, the antibacterial layer precursor was coated on the surface of the fabric (polyurethane fiber woven fabric), and dried at 60°C for 3 min. Then, the self-sealing layer precursor was sprayed, and dried at 70°C for 3 min. The temperature-sensitive layer precursor was electrostatically sprayed, and dried at 85°C for 2 min. The hydrophobic layer precursor was coated, and dried at 120°C for 5 min. Thus, a fabric containing a waterproof coating was obtained.

[0068] The coating thickness of the antibacterial layer precursor was 25um. The spraying thickness of the self-sealing layer precursor was 15um. The spraying thickness of the temperature-sensitive layer precursor was 20um. The coating thickness of the hydrophobic layer was 20um.

[0069] Example 2

[0070] The difference between Example 1 and Example 2 is that the raw material ratio of each layer is as follows:

[0071] Hydrophobic layer: polydimethylsiloxane 60 parts, hydroxylated graphene 10 parts, compound waxy 10 parts;

[0072] Temperature-sensitive layer: polyurethane skeleton 20 parts, thermal shrinkage and cold expansion agent 10 parts;

[0073] Self-sealing layer: macroporous silica skeleton 20 parts, water-absorbing expansion agent 10 parts;

[0074] Antibacterial isolation layer: polytetrafluoroethylene fiber 70 parts, tourmaline powder 10 parts, nano-silver sol 8 parts.

[0075] The preparation method of the waterproof coating is the same as that of Example 1.

[0076] Example 3

[0077] The difference from Example 1 is that the raw material ratio of each layer is as follows:

[0078] Hydrophobic layer: polydimethylsiloxane 70 parts, methyltrimethoxysilane 10 parts, hydroxylated graphene 12 parts, compound waxy 13 parts;

[0079] Temperature-sensitive layer: polyurethane skeleton 25 parts, thermal shrinkage and cold expansion agent 15 parts;

[0080] Self-sealing layer: macroporous silica skeleton 25 parts, water-absorbing expansion agent 15 parts;

[0081] Antibacterial isolation layer: polytetrafluoroethylene fiber 75 parts, tourmaline powder 12 parts, nano-silver sol 10 parts.

[0082] The preparation method of the waterproof coating is the same as that of Example 1.

[0083] Comparative Example 1

[0084] The difference from Example 1 is that the self-sealing layer is omitted, and the raw materials, ratios and preparation methods of the remaining layers are the same as those of Example 1.

[0085] Comparative Example 2

[0086] The difference from Example 1 is that the temperature-sensitive layer is omitted, and the raw materials, ratios and preparation methods of the remaining layers are the same as those of Example 1.

[0087] Comparative Example 3

[0088] The difference from Example 1 is that the self-sealing layer and the temperature-sensitive layer are omitted, and the raw materials, ratios and preparation methods of the remaining layers are the same as those of Example 1.

[0089] Experimental Example

[0090] Hydrophobic layer performance test

[0091] 1. The contact angle and roll angle of the surface hydrophobic layer of the waterproof coated fabric were tested according to GB / T 23794-2010, and the results are shown in Table 2:

[0092] Table 2

[0093]

[0094] 2. The moisture vapor transmission rate (MVTR) of the fabric of Examples 1-3 was tested using a sensor, as shown in Table 3.

[0095] Table 3

[0096]

[0097]

[0098] 3. Abrasion resistance (Taber abrasion test), and the results are shown in Table 4.

[0099] Table 4

[0100]

[0101] 4. Thermal response performance (DSC analysis), and the results are shown in Table 5:

[0102] Table 5

[0103]

[0104]

[0105] 5. Air permeability adjustment test, and the results are shown in Table 6:

[0106] Table 6

[0107]

[0108]

[0109] 6. Water absorption expansion rate, and the results are shown in Table 7:

[0110] Table 7

[0111]

[0112] From the above Tables 2-7, it can be concluded that the hydrophobic layer of the waterproof coating: contact angle > 160°, moisture vapor transmission rate ≥ 8000 g / m 2 / 24h, abrasion resistance is better than traditional fluorine coating. Temperature sensitive layer: shrinkage rate of 15% at -10℃, moisture vapor transmission rate of 8200 g / m 2 / 24h, and realizes intelligent temperature control. The self-sealing layer: 300% water absorption expansion in 2 hours, water pressure resistance >=10000mm H2O. These data show that the waterproof coating reaches the industry leading level in waterproofness, air permeability, durability and function integration, and can be applied to the preparation of high-end down jackets.

[0113] In summary, the waterproof coating provided by the present application forms a temperature control switch with the temperature-sensitive layer and the self-sealing layer. In a low-temperature and high-humidity state: the temperature-sensitive layer shrinks to reduce heat loss, and the self-sealing layer expands to resist water. In a high-temperature and low-humidity state: the temperature-sensitive layer expands to be air-permeable, and the self-sealing layer maintains pores to sweat.

[0114] The above-described embodiments are part of the embodiments of the present application, rather than all the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

Claims

1. A waterproof coating for down-filled garments, characterized in that, From outside to inside, it includes hydrophobic layer, temperature sensitive layer, self-sealing layer and antibacterial layer; by weight, it includes the following raw materials, Hydrophobic layer: polydimethylsiloxane 60-80 parts, methyltrimethoxysilane 10-20 parts, hydroxylated graphene 10-15 parts, compound waxy 10-15 parts; Temperature sensitive layer: polyurethane skeleton 20-30 parts, thermal shrinkage and cold expansion agent 10-20 parts; Self-sealing layer: macroporous silica skeleton 20-30 parts, water absorption and expansion agent 10-20 parts; Antibacterial isolation layer: polytetrafluoroethylene fiber 70-80 parts, tourmaline powder 10-15 parts, nano silver sol 8-10 parts.

2. A waterproof coating for down jackets according to claim 1, characterized in that, The compound waxy includes octadecyl trimethoxysilane, alumina gel, alginic acid, and the mass ratio of the three is 1:1.8:1.

5.

3. The waterproof coating for down jackets according to claim 1, wherein, The thermal shrinkage and cold expansion agent includes polytetrafluoroethylene, silicone rubber, antimony oxide, and cerium tungstate, and the mass ratio is 1:1:3:

3.

4. The waterproof coating for down jackets according to claim 1, wherein, The water absorption and expansion agent includes modified bentonite and alginic acid, and the mass ratio is 8:

1.

5. A waterproof coating for down jackets according to claim 4, characterized in that, The modified bentonite is prepared by the following method, The bentonite is dried in an oven at 100-105℃ for 4 hours, crushed and sieved through a 400 mesh sieve; then bentonite, silane coupling agent and deionized water are added in a reaction kettle, stirred at 300r / min to form a suspension, then anhydrous ethanol is added, heated to 65±5℃, constant temperature stirring for 6 hours, then the product suspension is filtered through a Buchner funnel, washed with deionized water until the filtrate pH=7, the filter cake is vacuum dried at 80℃ for 12 hours to obtain silanized bentonite particles; at 50-60℃, the silanized particles are mixed with molten paraffin, and zirconium oxide balls are used as medium in a ball mill at 400r / min for 2 hours, sieved through a 500 mesh sieve to obtain nano-sized modified bentonite.

6. A process for the preparation of a water repellent coating for down jackets according to any one of claims 1 to 5, characterized in that, It includes: S1, polytetrafluoroethylene fiber and tourmaline powder are added to a high-speed disperser, stirred at 2000r / min for 15min, nano silver sol is slowly added, continue to stir for 30min, add modified hydroxypropyl methyl cellulose, adjust to a paste, obtain the antibacterial layer precursor; S2, macroporous silica is dispersed in deionized water, modified bentonite and alginic acid are added, 90℃ water bath, 280W ultrasonic treatment for 40min, evaporate to 40mm thick, cool to 25℃, add binder and stir for 20min, obtain the self-sealing layer precursor; S3, polyurethane skeleton is premixed with thermal shrinkage and cold expansion agent, stirred at 700r / min for 30min, add acrylic emulsion and stir for 15min, obtain the temperature sensitive layer precursor; S4, polydimethylsiloxane, methyltrimethoxysilane and hydroxylated graphene are mixed and ultrasonically dispersed, add compound waxy and defoaming agent, stir at 1500r / min for 1 hour, obtain the hydrophobic layer precursor; S5, the antibacterial layer precursor is coated on the surface of the fabric, dried at 50-60℃ for 2-3min; Then the self-sealing layer precursor is sprayed, dried at 65-70℃ for 2-3min; Then the temperature sensitive layer precursor is electrostatically sprayed, dried at 80-85℃ for 1-2min; then the hydrophobic layer precursor is coated, dried at 110-120℃ for 4-5min; thus the waterproof coating is obtained.

7. The process for preparing a waterproof coating for down jackets according to claim 6, characterized in that: The coating thickness of the antibacterial layer precursor is 20-25 um.

8. The process for the preparation of a waterproof coating for down jackets according to claim 6, characterized in that, The spray thickness of the self-closing layer precursor is 10-15 um.

9. The process for the preparation of a waterproof coating for down jackets according to claim 6, characterized in that, The spray thickness of the temperature-sensitive layer precursor is 20-25 um.

10. The process for the preparation of a waterproof coating for down jackets according to claim 6, characterized in that, The coating thickness of the hydrophobic layer is 15-20 um.

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