A waterproof and moisture-permeable sleeping bag fabric and its preparation method

Abstract

The present invention relates to a waterproof and moisture-permeable sleeping bag fabric and a preparation method thereof, belonging to the technical field of functional fabrics. It is composed of a functional surface sizing and a base fabric. The prepolymer base glue and the crosslinking moisture-permeable auxiliary agent in the functional surface sizing crosslink and polymerize on the surface of the base fabric under the initiation of ultraviolet irradiation, enabling the base fabric and the coating layer to have good bonding ability. Moreover, the crosslinked structure is supported by the warp and weft cross-network of the base fabric, having better mechanical properties, not being easily peeled off or damaged during use and washing, and having good functional stability. The prepolymer base glue is a polyurethane linear polymer containing a silicon chain segment, having excellent water resistance. The crosslinking moisture-permeable auxiliary agent is an oligomer with a polyether chain as the main chain, having certain hydrophilicity. The crosslinking forms numerous hydrophilic pores, and gaseous water can be adsorbed and diffused by these hydrophilic pores, thereby achieving a good moisture-permeable effect. However, liquid water droplets are difficult to penetrate through these tiny hydrophilic pores due to the surface tension effect, thus having waterproof performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of functional fabrics, and specifically relates to a waterproof and moisture-permeable sleeping bag fabric and a preparation method thereof. Background Art

[0002] A sleeping bag is a bag used when sleeping, which can be used to keep heat loss to a minimum; with the increase in people's outdoor activities, sleeping bags have become essential equipment for outdoor camping; generally, materials such as down and vacuum cotton are filled in the interlayer of the sleeping bag fabric to improve the warmth retention and comfort of the sleeping bag. Traditional sleeping bag fabrics are made of cotton cloth, nylon cloth, etc., which are not waterproof and are prone to moisture absorption in outdoor environments, resulting in the sleeping bag becoming damp and dirty. Therefore, waterproof materials are used to treat the fabric to achieve waterproof effects. However, human metabolism generates moisture and heat, resulting in humidity and overheating inside the sleeping bag, and poor sleep comfort. With the development of fabric technology, fabrics with waterproof and moisture-permeable properties have been successively developed, greatly improving the comfort of sleeping bags.

[0003] In the prior art, waterproof and moisture-permeable fabrics are basically divided into high-density fabrics, coated fabrics, and laminated fabrics. Among them, high-density fabrics use hydrophobic fibers as the base material, and through high-density weaving, the textile pores are relatively small, hindering the penetration of moisture. This type has good moisture permeability but limited water resistance, and is generally only used for indoor sleeping bag materials; laminated fabrics are composed of a film material with a microporous structure and a fabric through a lamination technology, and the waterproof and moisture-permeable function is exerted through the functional film material. The most widely used one is the PTFE composite fabric. The production process of this type of composite fabric is complex, the production cost of the microporous film material is relatively high, and in addition, the bonding performance between the film material and the fabric is not good. During use, especially after washing, the film layer is easily damaged, resulting in the failure of the waterproof performance; in contrast, the coated fabric process is simple, the bonding strength between the coating and the fabric is good, and the waterproof performance is stable. However, it is difficult to form a breathable channel after the coating is cured. According to the existing publicly reported technologies, the moisture permeability of coated waterproof and moisture-permeable fabrics is generally about 3.2 kg / m 2 ·24h, and the moisture permeability performance is poor. Summary of the Invention

[0004] In order to solve the technical problems mentioned in the background art, the purpose of the present invention is to provide a waterproof and moisture-permeable sleeping bag fabric and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A preparation method of a waterproof and moisture-permeable sleeping bag fabric includes the following steps:

[0007] Step S1: Mix triethylamine, calcium oxide and tetrahydrofuran, control the temperature at 15 - 25°C in a water bath, and slowly add methylvinyldichlorosilane and hydroxy silicone oil simultaneously under stirring. After complete addition, carry out constant-temperature stirring reaction, control the total addition reaction time to be 2 - 3 h. After the reaction ends, centrifuge to remove the bottom precipitate, and then remove tetrahydrofuran by rotary evaporation under reduced pressure to obtain modified silicone oil;

[0008] Further, the dosage ratio of the hydroxyl content of hydroxy silicone oil, methylvinyldichlorosilane, triethylamine, calcium oxide and tetrahydrofuran is 0.1 mol : 32 - 40 mmol : 6 - 8 mL : 4 - 5 g : 35 - 50 mL. Triethylamine is miscible in the reaction as an acid-binding agent, and calcium oxide is a basic absorbent and loads the precipitated triethylamine hydrochloride to promote the reaction between methylvinyldichlorosilane and slightly excessive hydroxy silicone oil, forming a silicone oil with double bonds in the side chain and hydroxyl groups at the ends.

[0009] Further, the hydroxy silicone oil is selected from small molecular weight silicone oil with a number average molecular weight of 300 - 500.

[0010] Step S2: Mix hexamethylene diisocyanate, modified silicone oil and anhydrous toluene, heat up to 80 - 90°C under nitrogen protection, stir and react for 1.2 - 1.5 h, then cool down to 45 - 55°C for constant temperature, slowly add 1,4-butanediol. After complete addition, continue the constant-temperature stirring reaction, control the total addition reaction time to be 2 - 3 h, then add methanol and mix, and remove low-boiling substances including toluene by rotary evaporation under reduced pressure to obtain prepolymer base glue;

[0011] Further, the dosage ratio of hexamethylene diisocyanate, the hydroxyl content of modified silicone oil, 1,4-butanediol, anhydrous toluene and methanol is 0.1 mol : 45 - 65 mmol : 15 - 22 mmol : 160 - 220 mL : 20 - 30 mL. The modified silicone oil first reacts with hexamethylene diisocyanate to form a linear low-polymer, then the residual isocyanate in the low-polymer reacts with the small molecule and highly active 1,4-butanediol for chain extension, and finally the reaction is terminated by blocking with methanol to synthesize a prepolymer with a silicon chain in the main chain and double bonds introduced in the side chain.

[0012] Step S3: Mix β-mercaptoethylamine and dimethyl sulfoxide under nitrogen protection, heat up to 40 - 50°C, stir and slowly add polyethylene glycol diglycidyl ether. After complete addition, continue the constant-temperature stirring reaction, control the total addition reaction time to be 1.5 - 2 h. After the reaction ends, add deionized water and remove low-boiling substances including dimethyl sulfoxide by rotary evaporation under reduced pressure to obtain a cross-linked moisture-permeable auxiliary agent;

[0013] Further, the epoxy group content of polyethylene glycol diglycidyl ether, the dosages of β-mercaptoethylamine and dimethyl sulfoxide are in a ratio of 0.1 mol: 0.102 - 0.105 mol: 90 - 120 mL. The active amino group in β-mercaptoethylamine preferentially undergoes a ring-opening reaction with the epoxy group in polyethylene glycol diglycidyl ether, introducing mercapto modification.

[0014] Further, the number-average molecular weight of polyethylene glycol diglycidyl ether is 500.

[0015] Step S4: Stir the prepolymer base glue, crosslinking moisture-permeable auxiliary, photoinitiator and leveling agent at high speed until they are well mixed. After vacuum degassing, add allyl glycidyl ether to adjust the viscosity of the mixture to 1000 ± 50 mPa·s, obtaining a functional surface paste.

[0016] Further, the mass ratio of the dosages of the prepolymer base glue, crosslinking moisture-permeable auxiliary, photoinitiator and leveling agent is 100: 8.5 - 11: 0.02 - 0.03: 0.12 - 0.16.

[0017] Step S5: Knife-coat the functional surface paste on the surface of the base fabric, then transfer it into an ultraviolet curing furnace, and bake and laminate it under ultraviolet irradiation to obtain a waterproof and moisture-permeable sleeping bag fabric.

[0018] Further, the coating amount of the functional surface paste is 30 g / m 2 , the ultraviolet irradiation intensity is 200 - 300 W / m 2 , the baking temperature is 80 ± 2 °C, the irradiation and baking time is 25 - 35 min, and the mercapto group introduced in the crosslinking moisture-permeable auxiliary reacts with the double bond in the side chain of the prepolymer base glue to form an intertwined network structure.

[0019] The beneficial effects of the present invention:

[0020] The present invention adopts a coating method to compound a functional surface paste and a base fabric to prepare a waterproof and breathable sleeping bag fabric. Compared with existing breathable fabrics, the functional surface paste has excellent moisture permeability and stability. The functional surface paste adopts a self-made prepolymerized primer and a cross-linked moisture permeability aid as a base material, wherein the prepolymerized primer is formed by reacting methylvinyldichlorosilane with a slightly excess of hydroxyl silicone oil to form a modified silicone oil with a double bond in the side chain and a hydroxyl end-capped end, and then reacting with hexamethylene diisocyanate to form an oligomer with a linear structure; the cross-linked moisture permeability aid is formed by ring-opening the epoxy group in β-mercaptoethylamine and polyethylene glycol diglycidyl ether to introduce a mercapto modification. After coating, the prepolymerized primer and the cross-linked moisture permeability aid are cross-linked and polymerized on the surface of the base fabric under the initiation of ultraviolet radiation, so that the base fabric and the coating layer are in a stable state. It has good bonding ability and is not easy to peel off and fail during repeated washing. The cross-linked structure uses the warp and weft cross network of the base fabric as the support structure, has better mechanical properties, and is not easy to be damaged during use and washing, and thus has good functional stability. The pre-polymer primer is a polyurethane linear polymer containing silicon chain segments, which has excellent water resistance. The cross-linked moisture permeability aid is a oligomer with a polyether chain as the main chain, which has certain hydrophilicity. It is interspersed between the molecular chains of the pre-polymer primer to cross-link, forming numerous hydrophilic pores in the cross-linked network. Gaseous water can be adsorbed and diffused by the hydrophilic pores, thereby achieving a good moisture permeability effect, while liquid water droplets are difficult to pass through the tiny hydrophilic pores due to tension, thus having waterproof properties. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Example 1: Preparation of waterproof and breathable sleeping bag fabric, specifically as follows:

[0023] Step S1: Take triethylamine, calcium oxide and tetrahydrofuran and mix them. The temperature of the water bath is controlled at 15°C and stirred at 120rpm. Methylvinyldichlorosilane and hydroxy silicone oil are added simultaneously using a titrator. In this embodiment, a small molecule silicone oil provided by Anhui Mingyi Silicon Industry Co., Ltd. is used, and the number average molecular weight is about 300. The addition time of the two is controlled to be 2h. After complete addition, the reaction is stirred at a constant temperature. The total addition reaction time is controlled to be 3h. During the reaction, the hydroxyl content of the hydroxy silicone oil, methylvinyldichlorosilane, triethylamine, calcium oxide and tetrahydrofuran are used in a ratio of 0.1mol:40mmol:8mL:5g:35mL. After the reaction is completed, the bottom precipitate is removed by centrifugation, and the tetrahydrofuran is quickly removed by vacuum rotary evaporation to obtain modified silicone oil.

[0024] Step S2: Charge and mix hexamethylene diisocyanate, modified silicone oil, and anhydrous toluene, introduce nitrogen for protection, heat up to 90 °C, apply stirring at 80 rpm for reaction for 1.2 h, then cool down to 55 °C for constant temperature. Then, slowly add 1,4-butanediol within 1 h. After complete addition, continue stirring at constant temperature for reaction, control the total reaction time for addition to be 2 h, then add methanol for mixing. During the reaction, the molar ratio of hexamethylene diisocyanate, the hydroxyl content of modified silicone oil, 1,4-butanediol, anhydrous toluene, and methanol is 0.1 mol: 65 mmol: 15 mmol: 220 mL: 30 mL. After the reaction, remove low-boiling substances including toluene by rotary evaporation under reduced pressure to obtain the prepolymer base glue.

[0025] Step S3: Charge and mix β-mercaptoethylamine and dimethyl sulfoxide under nitrogen protection, heat up to 50 °C, apply stirring at 400 rpm, and add polyethylene glycol diglycidyl ether within 30 min. In the examples, polyethylene glycol diglycidyl ether provided by Shanghai Kemi Chemical Technology Co., Ltd. is used, and the number-average molecular weight is about 500. After complete addition, continue stirring at constant temperature for reaction, control the total reaction time for addition to be 1.5 h. During the reaction, the molar ratio of the epoxy group content of polyethylene glycol diglycidyl ether, β-mercaptoethylamine, and dimethyl sulfoxide is 0.1 mol: 0.105 mol: 120 mL. After the reaction, add deionized water with a mass 0.5 times that of the reaction substrate and perform rotary evaporation under reduced pressure to quickly remove low-boiling substances including dimethyl sulfoxide to obtain the crosslinked moisture-permeable aid.

[0026] Step S4: Charge the prepolymer base glue, crosslinked moisture-permeable aid, photoinitiator, and leveling agent according to a mass ratio of 100:11:0.03:0.12. In the examples, TPO-L is used as the photoinitiator and BYK-333 is used as the leveling agent. Stir and mix at a high speed of 1200 rpm for 5 min, perform vacuum degassing treatment for 10 min, then stir at a low speed of 40 rpm, and add allyl glycidyl ether to adjust the viscosity of the mixture to 1000 ± 50 mPa·s to obtain the functional surface paste.

[0027] Step S5: Apply the functional surface paste on the surface of the base fabric using a knife coater. In the examples, 190T polyester taffeta is used, and control the coating amount of the functional surface paste to be 30 g / m 2 , then transfer it into an ultraviolet curing furnace. The drying temperature in the baking furnace is 80 ± 2 °C, and the ultraviolet irradiation intensity is 200 W / m 2 , and the irradiation and baking time is 35 min. The functional surface paste is cured and compounded with the base fabric to obtain the waterproof and moisture-permeable sleeping bag fabric.

[0028] Example 2: Prepare the waterproof and moisture-permeable sleeping bag fabric as follows:

[0029] Step S1: Take triethylamine, calcium oxide and tetrahydrofuran, put them into the reactor and mix well. Control the temperature at 25 °C in a water bath, stir at 180 rpm, and simultaneously add methylvinyldichlorosilane and hydroxy silicone oil using a burette. In this example, the small molecule silicone oil provided by Anhui Mingyi Silicon Industry Co., Ltd. is used, with a number average molecular weight of about 500. Control the dropping time of both to 1.5 h. After complete addition, stir and react at a constant temperature, and control the total reaction time to 2 h. During the reaction, the dosage ratio of the hydroxyl content of hydroxy silicone oil, methylvinyldichlorosilane, triethylamine, calcium oxide and tetrahydrofuran is 0.1 mol: 32 mmol: 6 mL: 4 g: 50 mL. After the reaction, centrifuge to remove the bottom precipitate, and quickly remove tetrahydrofuran by rotary evaporation under reduced pressure to obtain the modified silicone oil.

[0030] Step S2: Take hexamethylene diisocyanate, modified silicone oil and anhydrous toluene, put them into the reactor and mix. Pass nitrogen for protection, heat up to 80 °C, stir and react at 60 rpm for 1.5 h, then cool down to 45 °C and keep the temperature constant. Then take 1,4-butanediol and slowly add it within 2 h. After complete addition, continue to stir and react at a constant temperature, and control the total reaction time to 3 h. Then add methanol and mix. During the reaction, the dosage ratio of hexamethylene diisocyanate, the hydroxyl content of modified silicone oil, 1,4-butanediol, anhydrous toluene and methanol is 0.1 mol: 45 mmol: 22 mmol: 160 mL: 20 mL. After the reaction, remove the low-boiling substances including toluene by rotary evaporation under reduced pressure to obtain the prepolymer base glue.

[0031] Step S3: Take β-mercaptoethylamine and dimethyl sulfoxide, put them into the reactor and mix well under nitrogen protection, heat up to 40 °C, stir at 300 rpm, and add polyethylene glycol diglycidyl ether within 50 min. After complete addition, continue to stir and react at a constant temperature, and control the total reaction time to 2 h. During the reaction, the dosage ratio of the epoxy group content of polyethylene glycol diglycidyl ether, β-mercaptoethylamine and dimethyl sulfoxide is 0.1 mol: 0.102 mol: 90 mL. After the reaction, add deionized water with a mass 0.5 times that of the reaction substrate and perform rotary evaporation under reduced pressure to quickly remove the low-boiling substances including dimethyl sulfoxide to obtain the cross-linked moisture permeable aid.

[0032] Step S4: Take the prepolymer base glue, cross-linked moisture permeable aid, photoinitiator and leveling agent and feed them according to a mass ratio of 100:8.5:0.02:0.16, stir and mix at a high speed of 1200 rpm for 5 min, perform vacuum degassing treatment for 10 min, then stir at a low speed of 40 rpm, and add allyl glycidyl ether to adjust the viscosity of the mixture to 1000 ± 50 mPa·s to obtain the functional surface coating.

[0033] Step S5: Take the functional surface coating and coat it on the surface of the base fabric using a knife coater. In the examples, 190T polyester twill is used in all cases. Control the coating amount of the functional surface coating to 30 g / m 2, and then transferred into an ultraviolet curing furnace. The drying temperature in the baking furnace is 80 ± 2 °C, and the ultraviolet irradiation intensity is 300 W / m 2 , and the irradiation baking time is 25 min. The functional surface sizing is cured and compounded with the base fabric to obtain a waterproof and moisture-permeable sleeping bag fabric.

[0034] Example 3. Preparation of a waterproof and moisture-permeable sleeping bag fabric is as follows:

[0035] Step S1: Take triethylamine, calcium oxide, and tetrahydrofuran, feed and mix them evenly. Control the temperature in a water bath at 20 °C, stir with an auxiliary speed of 150 rpm, and simultaneously add methylvinyldichlorosilane and hydroxy silicone oil using a burette. In this example, small molecule silicone oil provided by Anhui Mingyi Silicon Industry Co., Ltd. is used, with a number average molecular weight of about 500. Control the dropping time of both to be 1.8 h. After complete addition, stir and react at a constant temperature, and control the total addition reaction time to be 2.5 h. During the reaction, the dosage ratio of the hydroxyl group content of hydroxy silicone oil, methylvinyldichlorosilane, triethylamine, calcium oxide, and tetrahydrofuran is 0.1 mol: 36 mmol: 7 mL: 5 g: 45 mL. After the reaction ends, centrifuge to remove the bottom precipitate, and quickly remove tetrahydrofuran by rotary evaporation under reduced pressure to obtain modified silicone oil.

[0036] Step S2: Take hexamethylene diisocyanate, modified silicone oil, and anhydrous toluene, feed and mix them, introduce nitrogen for protection, heat up to 85 °C, stir and react at 80 rpm for 1.5 h, then cool down to 50 °C and keep it at a constant temperature. Then take 1,4-butanediol and slowly add it within 1.5 h. After complete addition, continue to stir and react at a constant temperature, and control the total addition reaction time to be 2.5 h. Then add methanol and mix. During the reaction, the dosage ratio of hexamethylene diisocyanate, the hydroxyl group content of modified silicone oil, 1,4-butanediol, anhydrous toluene, and methanol is 0.1 mol: 55 mmol: 18 mmol: 200 mL: 25 mL. After the reaction ends, remove low-boiling substances including toluene by rotary evaporation under reduced pressure to obtain a prepolymer base glue.

[0037] Step S3: Take β-mercaptoethylamine and dimethyl sulfoxide, feed and mix them evenly under nitrogen protection, heat up to 45 °C, stir at 360 rpm, and add polyethylene glycol diglycidyl ether within 40 min. After complete addition, continue to stir and react at a constant temperature, and control the total addition reaction time to be 1.8 h. During the reaction, the dosage ratio of the epoxy group content of polyethylene glycol diglycidyl ether, β-mercaptoethylamine, and dimethyl sulfoxide is 0.1 mol: 0.104 mol: 110 mL. After the reaction ends, add deionized water with a mass 0.5 times that of the reaction substrate and perform rotary evaporation under reduced pressure to quickly remove low-boiling substances including dimethyl sulfoxide to obtain a cross-linked moisture-permeable auxiliary agent.

[0038] Step S4: Take prepolymer base glue, crosslinking moisture-permeable auxiliary agent, photoinitiator and leveling agent and feed them according to a mass ratio of 100:9.2:0.02:0.15, stir and mix them at a high speed of 1200 rpm for 5 min, conduct vacuum degassing treatment for 10 min, then stir at a low speed of 40 rpm, and add allyl glycidyl ether to adjust the viscosity of the mixture to 1000 ± 50 mPa·s to obtain a functional surface sizing.

[0039] Step S5: Take the functional surface sizing and coat it on the surface of the base fabric by a knife coater. In the examples, 190T polyester twill is used in all cases, and control the coating amount of the functional surface sizing to be 30 g / m 2 , and then transfer it into an ultraviolet curing furnace. The drying temperature in the baking furnace is 80 ± 2 °C, and the ultraviolet irradiation intensity is 240 W / m 2 . The irradiation and baking time is 30 min. The functional surface sizing is cured and compounded with the base fabric to obtain a waterproof and moisture-permeable sleeping bag fabric.

[0040] The comparative example is selected from a commercially available PTFE composite waterproof and moisture-permeable fabric, provided by Suzhou Xinxuanchen Textile Technology Co., Ltd.

[0041] Take the fabrics prepared in Examples 1 - 3 and the fabric provided in Comparative Example 1, and conduct moisture permeability tests with reference to the GB / T12704-2009 standard and hydrostatic pressure tests with reference to the GB / T 74744-1997 standard. The specific test data are shown in Table 1 as follows:

[0042] Table 1

[0043]

[0044] As can be seen from the data in Table 1, for the waterproof and moisture-permeable sleeping bag fabric prepared by the present invention, its moisture permeability rate reaches 6.842 - 7.315 kg / m 2 ·24 h, which is better than the existing PTFE composite fabric, and its hydrostatic pressure resistance reaches more than 70 kPa, having good waterproof and moisture-permeable properties.

[0045] Take the fabrics prepared in Examples 1 - 3 and the fabric provided in Comparative Example 1, place them in a washing machine and start strong washing. The washing time is 40 min. After washing, take them out and dry them at 60 °C for 3 h. Repeat the washing for 100 cycles, and then conduct moisture permeability and hydrostatic pressure resistance tests again. The specific test data are shown in Table 2 as follows:

[0046] Table 2

[0047]

[0048] As can be seen from the data in Table 2, for the waterproof and moisture-permeable sleeping bag fabric prepared by the present invention, its moisture permeability rate decreased slightly after 100 weeks of washing, the hydrostatic pressure resistance remained stable, and good waterproof and moisture-permeable performance was maintained. After analysis, it may be that during the washing and baking process, a small amount of impurities adhered to the surface and had a small impact. For the comparative example, the moisture permeability increased significantly, and the hydrostatic pressure resistance decreased severely. After analysis, it may be that during the washing process, the PTFE film layer peeled off or was damaged.

[0049] In the description of the specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0050] The above content is only an example and illustration of the present invention. Those skilled in the art of the present technology can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, as long as they do not deviate from the invention or exceed the scope defined by the claims of the present invention, they should fall within the protection scope of the present invention.

Claims

1. A method for preparing a waterproof and moisture-permeable sleeping bag fabric, characterized in that, It includes the following steps: Step S1: Mix triethylamine, calcium oxide and tetrahydrofuran, control the temperature in a water bath at 15 - 25°C, and slowly add methylvinyl dichlorosilane and hydroxy silicone oil simultaneously under stirring. Control the total addition reaction time to be 2 - 3 h. After the reaction ends, centrifuge to remove the precipitate and perform rotary evaporation under reduced pressure to obtain modified silicone oil; Step S2: Mix hexamethylene diisocyanate, modified silicone oil and anhydrous toluene, heat up to 80 - 90°C under nitrogen protection, stir and react for 1.2 - 1.5 h. Then cool down to 45 - 55°C for constant temperature, slowly add 1,4 - butanediol, control the total addition reaction time to be 2 - 3 h, add methanol and mix, and perform rotary evaporation under reduced pressure to obtain prepolymer base glue; Step S3: Mix β - mercaptoethylamine and dimethyl sulfoxide under nitrogen protection, heat up to 40 - 50°C, stir and slowly add polyethylene glycol diglycidyl ether. Control the total addition reaction time to be 1.5 - 2 h. After the reaction ends, add deionized water and perform rotary evaporation under reduced pressure to obtain cross - linked moisture - permeable auxiliary agent; Step S4: Stir and mix the prepolymer base glue, cross - linked moisture - permeable auxiliary agent, photoinitiator and leveling agent, perform vacuum degassing, and then add allyl glycidyl ether to adjust the viscosity of the mixture to 1000 ± 50 mPa·s to obtain functional surface sizing; Step S5: Knife - coat the functional surface sizing on the surface of the base fabric, then transfer it into an ultraviolet curing furnace, and bake and laminate under ultraviolet irradiation to obtain a waterproof and moisture - permeable sleeping bag fabric; The number - average molecular weight of the hydroxy silicone oil is 300 - 500, and the number - average molecular weight of polyethylene glycol diglycidyl ether is 500.

2. The preparation method of a waterproof and moisture-permeable sleeping bag fabric according to claim 1, characterized in that, The dosage ratio of the hydroxy group content of hydroxy silicone oil, methylvinyl dichlorosilane, triethylamine, calcium oxide and tetrahydrofuran is 0.1 mol: 32 - 40 mmol: 6 - 8 mL: 4 - 5 g: 35 - 50 mL.

3. The preparation method of a waterproof and moisture-permeable sleeping bag fabric according to claim 2, wherein The dosage ratio of hexamethylene diisocyanate, the hydroxy group content of modified silicone oil, 1,4 - butanediol, anhydrous toluene and methanol is 0.1 mol: 45 - 65 mmol: 15 - 22 mmol: 160 - 220 mL: 20 - 30 mL.

4. The preparation method of a waterproof and moisture-permeable sleeping bag fabric according to claim 1, characterized in that, The dosage ratio of the epoxy group content of polyethylene glycol diglycidyl ether, β - mercaptoethylamine and dimethyl sulfoxide is 0.1 mol: 0.102 - 0.105 mol: 90 - 120 mL.

5. The preparation method of a waterproof and moisture-permeable sleeping bag fabric according to any one of claims 3-4, characterized in that, The mass ratio of the dosages of prepolymer base glue, cross - linked moisture - permeable auxiliary agent, photoinitiator and leveling agent is 100: 8.5 - 11: 0.02 - 0.03: 0.12 - 0.

16.

6. The preparation method of a waterproof and moisture-permeable sleeping bag fabric according to claim 5, characterized in that, The ultraviolet irradiation intensity is 200 - 300 W / m 2 , the baking temperature is 80 ± 2 °C, and the irradiation baking time is 25 - 35 min.

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