A new energy vehicle interior resistant microfiber fabric and a preparation method thereof

Abstract

The application relates to a new energy vehicle interior super-microfiber fabric with high rain erosion resistance and breakage resistance and a preparation method thereof. The new energy vehicle interior super-microfiber fabric comprises a non-woven fabric blank and an elastic filling structure filled in the non-woven fabric blank. The elastic filling structure is obtained by curing a polyurethane impregnating solution. The polyurethane impregnating solution is prepared from the following raw materials in parts by weight: polyol, emulsifier, isocyanate, chain extender, ammonium persulfate, modifier, solvent and other additives. The modifier is one or more of alkyl acrylate phosphate, o-phenylphenoxyethyl acrylate and 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene. The adhesion and chemical resistance of the polyurethane impregnating solution are improved through the modifier, the prepared elastic filling structure is closely connected with the non-woven fabric blank, the obtained super-microfiber fabric has better rain erosion resistance and breakage resistance, the possibility of breakage of the super-microfiber fabric after long-term immersion in rainwater is reduced, and the durability of the new energy vehicle interior is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the field of new energy automobile interiors, in particular to a new energy automobile interior break-resistant microfiber fabric and a preparation method thereof. BACKGROUND

[0002] With the rapid development of new energy vehicles, more and more people have requirements for light weight, high design requirements and recyclability of new energy vehicles, and the requirements are getting higher and higher; therefore, the current new energy vehicles use light weight non-woven fabrics in the aspects of ornaments and partitions.

[0003] The microfiber fabric is a kind of leather-like non-woven fabric produced by island fibers, which has the characteristics of light weight, soft hand feeling, air permeability, break resistance and the like, and has become the first choice for new energy vehicle interiors. The new energy vehicle interiors mainly include rear window sills, trunk pads, floor seat backrests and vehicle body bottom shields.

[0004] The microfiber fabric is usually formed by needling the fibers into a fabric, and then dipping the fabric in glue. The glue used for dipping is polyurethane glue. After the glue is cured, the inside of the non-woven fabric body forms a polyurethane elastic structure, so that the microfiber fabric has softness, good air permeability, excellent wear resistance and tensile strength.

[0005] However, the microfiber fabric has many pores and is easy to absorb and store water. The polyurethane glue used for the microfiber fabric is not resistant to water, acid, alkali and salt, and the like. Therefore, the polyurethane elastic structure formed is easy to absorb water and rot, which leads to the microfiber fabric being easy to break during use. The water-resistant polyurethane elastic structure is also prepared by modification, but when it is soaked in rainwater, it is still easy to be eroded, which leads to the microfiber fabric used for new energy vehicle interiors being easy to break during use.

[0006] Especially in the rainy season, long-lasting heavy rain makes it easy for rainwater to enter the new energy vehicle interior, and the interior is easy to absorb rainwater and difficult to quickly drain the rainwater, which leads to the polyurethane elastic structure being eroded by rainwater, resulting in the polyurethane elastic structure being corroded and broken, and reducing the structural stability of the microfiber fabric. Therefore, the microfiber fabric is easy to break during use, which reduces the durability of the new energy vehicle interior. Therefore, further research is needed. SUMMARY

[0007] In order to solve the above technical problems and reduce the possibility of breaking after rainwater soaking, the application provides a new energy automobile interior break-resistant microfiber fabric and a preparation method thereof.

[0008] The first aspect relates to a new energy vehicle interior super fiber fabric with high breaking resistance, which comprises a non-woven fabric body and an elastic filling structure filled in the non-woven fabric body. The elastic filling structure is obtained by curing a polyurethane impregnating solution. The polyurethane impregnating solution is prepared from the following raw materials in parts by weight: 7-13 parts of polyol, 1-3 parts of emulsifier, 5-8 parts of isocyanate, 3-5 parts of chain extender, 0.2-0.5 parts of ammonium persulfate, 3-8 parts of modifier, 60-80 parts of solvent, and 3-7 parts of other additives.

[0009] The modifier is one or more of alkyl acrylate phosphate, o-phenylphenoxyethyl acrylate, and 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene.

[0010] In the above technical solution, after the alkyl acrylate phosphate, o-phenylphenoxyethyl acrylate, and 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene are reacted and cured with the polymer, they all have good chemical resistance and water resistance, and form a stable network elastomer with other raw materials, so that the prepared elastic filling structure has good elasticity, water resistance, and chemical resistance.

[0011] Meanwhile, the alkyl acrylate phosphate, o-phenylphenoxyethyl acrylate, and 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene can also improve the adhesion of the polyurethane impregnating solution, so that the prepared elastic filling structure is tightly connected with the non-woven fabric body, the super fiber fabric has good rainwater erosion resistance and breaking resistance, and the possibility of damage after long-term immersion in rainwater is reduced, thereby improving the durability of the new energy vehicle interior.

[0012] Preferably, the weight ratio of the alkyl acrylate phosphate, o-phenylphenoxyethyl acrylate, and 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene is 1:(1.2-1.8):(2-3.2).

[0013] The alkyl acrylate phosphate, o-phenylphenoxyethyl acrylate, and 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene are compounded to have a good synergistic effect. When used for modifying the polyurethane prepolymer, they have a good modification effect, so that the prepared elastic filling structure has good water resistance, chemical resistance, elasticity, and structural stability. Meanwhile, they can further improve the adhesion stability of the polyurethane impregnating solution, so that the polyurethane impregnating solution can be stably adhered and filled in the non-woven fabric body. After curing and molding, the prepared elastic filling structure is stably connected with the non-woven fabric body. When the prepared super fiber fabric is used for the new energy vehicle interior, it has good flexibility, breaking strength, and rainwater erosion resistance, and the possibility of corrosion and damage after immersion in rainwater is reduced. The durability of the super fiber fabric is improved, and the possibility of damage of the new energy vehicle interior is reduced.

[0014] Preferably, the polyol is one or more of a polymer of polycaprolactone diol, 1,5-pentanediol and 1,6-hexanediol, and a copolyether glycol.

[0015] The polycaprolactone diol, 1,5-pentanediol and 1,6-hexanediol polymer, and copolyether glycol can react with isocyanate to produce a polyurethane prepolymer with good flexibility and good water resistance, and then cooperate with a modifier to make the prepared polyurethane sizing solution have better adhesion and formability, and the formed elastic filling structure has better water resistance, chemical resistance, flexibility and the like, reducing the possibility of breaking and damage, and after long-term contact with rainwater, it is not easy to appear erosion and the like, improving the durability of the microfiber fabric.

[0016] When the polycaprolactone diol, 1,5-pentanediol and 1,6-hexanediol polymer, and copolyether glycol are compounded, they play a better role, cooperate with the modifier and isocyanate, and make the prepared microfiber fabric have better flexibility, water resistance, chemical resistance and the like, reducing the possibility of damage and corrosion for new energy vehicle interiors, and improving the durability thereof.

[0017] Preferably, the isocyanate is modified diphenylmethane-4,4' diisocyanate and / or polymethylene polyphenyl polyisocyanate.

[0018] After the modified diphenylmethane-4,4' diisocyanate and / or polymethylene polyphenyl polyisocyanate are compounded with the polyol and the modifier, the prepared polyurethane sizing solution used for sizing can be stably adhered to the surface of the fiber, and after curing, the formed elastic filling structure has better water resistance, chemical resistance, flexibility and the like, so that the microfiber fabric has better flexibility, soft hand feeling, and after being soaked in rainwater, it can maintain better breaking strength, reducing the possibility of damage of the prepared microfiber fabric.

[0019] Preferably, the weight ratio of the modified diphenylmethane-4,4' diisocyanate and the polymethylene polyphenyl polyisocyanate is (0.7-1.2):(0.5-1).

[0020] When the modified diphenylmethane-4,4' diisocyanate and the polymethylene polyphenyl polyisocyanate are compounded, they play a synergistic role, and then make the flexibility of the microfiber fabric better and the breaking strength higher, thereby reducing the possibility of damage of the microfiber fabric, and when soaked in rainwater, the microfiber is not easy to swell by absorbing water and is not easy to be corroded by rainwater, so that the microfiber fabric used for new energy vehicle interiors has high durability.

[0021] Preferably, the chain extender is 1,4-butanediol or 1,6-hexanediol.

[0022] The above chain extender is used to introduce hydrophilic groups into the polyurethane prepolymer system, and also plays a role in chain extension, so that the polyurethane sizing solution has better adhesion, as well as flexibility and elasticity after forming, so that the structure of the microfiber fabric is stable, reducing the possibility of damage. Improve its durability.

[0023] Preferably, the emulsifier is OP-10 and / or OP-20.

[0024] The above OP-10 and / or OP-20 play a better emulsification and dispersion role, and cooperate with the raw material system of the polyurethane sizing solution, so that it is easy to size, improve the sizing quality and processing efficiency.

[0025] Preferably, the other auxiliary agent is one or more of a filler, a thickening agent, and a pigment.

[0026] The filler, thickening agent, and pigment auxiliary agent cooperate with the raw material system of the polyurethane sizing solution of the present application to make the microfiber fabric have better flexibility, water resistance, chemical resistance, etc., so it is used as a new energy vehicle interior, and has better damage resistance. When soaked in rainwater, it is not easy to appear damage phenomenon.

[0027] In addition, the chemical resistance of the present application refers to the ability to resist acid, alkali, salt, solvent and other chemicals. In particular, to acid and salt.

[0028] Preferably, the filler is one or more of nano-zinc oxide, white carbon black, zirconium oxide, and nano-hexagonal boron nitride; and the thickening agent is EVA emulsion and / or EAA emulsion.

[0029] One or more of nano-zinc oxide, white carbon black, zirconium oxide, and nano-hexagonal boron nitride is used as a filler, which has a better filling and reinforcing effect. The EVA emulsion and / or EAA emulsion has a better tackifying effect, and cooperates with the raw material system of the polyurethane sizing solution of the present application, so that the elastic filling structure has better water resistance, chemical resistance, flexibility, and reduces the possibility of damage of the prepared microfiber fabric. At the same time, when soaked in rainwater for a long time, it is not easy to appear the possibility of water absorption swelling, immersion corrosion leading to breakage and cracking.

[0030] In a second aspect, the present application provides a preparation method of a damage-resistant microfiber fabric for a new energy vehicle interior, characterized in that it is prepared by the following method:

[0031] The polyurethane impregnation solution is prepared by the following steps: polyols are weighed and heated, and then dehydrated under vacuum; isocyanate is added and reacted; the temperature is lowered, and then chain extender is added and reacted; the pre-polymer is obtained; then modifier is added and reacted; after the reaction, emulsifier and solvent are added, and the mixture is dispersed by stirring to obtain a dispersion; then ammonium persulfate is added and stirred until uniform; after the reaction is completed, ammonia water is added for neutralization; then other additives are added and mixed until uniform, thereby obtaining the polyurethane impregnation solution.

[0032] Needling: the island fibers are dispersed and then stacked into a fiber layer, and then a non-woven fabric blank is obtained after needling;

[0033] Impregnation: the non-woven fabric blank is impregnated in the impregnation solution, and then the elastic filling structure is filled in the non-woven fabric blank after solidification, thereby obtaining the superfine fabric.

[0034] In summary, the present application has the following advantages:

[0035] The alkyl acrylate phosphate, o-phenylphenoxyethyl acrylate and 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene can also improve the adhesion of the polyurethane impregnation solution, so that the elastic filling structure is closely connected with the non-woven fabric blank, and the superfine fabric obtained has better rain erosion resistance and breaking resistance, thereby reducing the possibility of damage of the superfine fabric after long-term immersion in rainwater, and improving the durability of the interior of the new energy vehicle. DETAILED DESCRIPTION

[0036] The present application is further described in detail below in combination with examples.

[0037] Sources of some raw materials;

[0038]

[0039]

[0040] EXAMPLE

[0041] Example 1

[0042] A breaking-resistant superfine fabric for the interior of a new energy vehicle is prepared by the following method:

[0043] The polyurethane sizing solution is prepared as follows: 7 kg of polyol is put into a reaction kettle and heated to 103℃, vacuum dehydration is carried out at -0.1 MPa for 2 h, 5 kg of isocyanate is added, and reaction is carried out at a rotation speed of 40 r / min for 1.5 h, the temperature is lowered to 70℃, 3 kg of chain extender is added, and stirring and reaction are continued for 1 h to obtain a prepolymer, 8 kg of modifier and a small amount of acetone (500 g) are added to control the viscosity, stirring and heating to 75℃ are continued, and after 2 h of heat preservation reaction, the temperature is lowered to 38℃, 1 kg of emulsifier, 60 kg of solvent are added, and stirring and dispersion are carried out at a rotation speed of 500 r / min, a dispersion is obtained, 0.2 kg of ammonium persulfate is added, and stirring and reaction are carried out at a rotation speed of 100 r / min for 2 h, after the reaction is completed, ammonia water is added for neutralization to a pH of 7, 2 kg of white carbon black and 1 kg of EVA are added, and stirring is continued to fully mix and uniformly disperse, thereby obtaining a polyurethane sizing solution.

[0044] Needling: 37 islands of 3.5D / 51 island fibers are dispersed, and then stacked into a fiber layer, and after needling, 200 g / m 2 Non-woven fabric embryo;

[0045] Sizing: the non-woven fabric embryo is conveyed to a sizing device and immersed in the polyurethane sizing solution for 2 min for sizing treatment, the sizing wet amount is about 150 g / m 2 , and then conveyed to a curing device, the curing temperature is 160℃, the time is 10 s, and then the non-woven fabric embryo is conveyed into a drying device for drying, the drying temperature is 150℃, the time is 5 min, and after curing, the non-woven fabric embryo is filled with an elastic filling structure, thereby obtaining a superfine fabric with a thickness of 1.4 mm.

[0046] The modifier is 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene; the emulsifier is OP-10; the polyol is copolyether glycol; the isocyanate is modified diphenylmethane-4,4' diisocyanate; the chain extender is 1,4-butanediol; the emulsifier is OP-10; the filler is white carbon black; and the thickening agent is EVA emulsion. The island fibers are prepared from 70% by mass of polyamide and 30% by mass of polyester; and the solvent is water.

[0047] Example 2-3

[0048] Example 2-3 is different from example 1 in that the amounts of raw materials are different, as shown in Table 1.

[0049] Table 2: Amounts of raw materials (kg) in examples 1-3

[0050]

[0051]

[0052] Example 4

[0053] Example 4 differs from Example 2 in that the modifying agent is alkyl acrylate phosphate ester.

[0054] Example 5

[0055] Example 5 differs from Example 2 in that the modifying agent is o-phenylphenoxyethyl acrylate.

[0056] Example 6

[0057] Example 6 differs from Example 2 in that the modifying agent consists of 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene and alkyl acrylate phosphate ester in a weight ratio of 2.5:1.

[0058] Example 7

[0059] Example 7 differs from Example 2 in that the modifying agent consists of 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene, o-phenylphenoxyethyl acrylate in a weight ratio of 3:2.

[0060] Example 8

[0061] Example 8 differs from Example 2 in that the modifying agent consists of alkyl acrylate phosphate ester, o-phenylphenoxyethyl acrylate, 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene in a weight ratio of 1:1.2:2.

[0062] Example 9

[0063] Example 9 differs from Example 2 in that the modifying agent consists of alkyl acrylate phosphate ester, o-phenylphenoxyethyl acrylate, 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene in a weight ratio of 1:1.5:2.5.

[0064] Example 10

[0065] Example 10 differs from Example 2 in that the modifying agent consists of alkyl acrylate phosphate ester, o-phenylphenoxyethyl acrylate, 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene in a weight ratio of 1:1.8:3.2.

[0066] Example 11

[0067] Example 11 differs from Example 9 in that the polyol is a polycaprolactone diol.

[0068] Example 12

[0069] Example 12 differs from Example 9 in that the polyol is a polymer of 1,5-pentanediol and 1,7-heptanediol.

[0070] Example 13

[0071] Example 13 differs from Example 9 in that the polyol consists of a polymer of polycaprolactone diol, 1,5-pentanediol, and 1,7-heptanediol in a weight ratio of 2:3.

[0072] Example 14

[0073] Example 14 differs from Example 9 in that the polyol consists of a polymer of polycaprolactone diol, 1,5-pentanediol, and 1,7-heptanediol in a weight ratio of 2:3.

[0074] Example 15

[0075] Example 15 differs from Example 9 in that the polyol consists of a polymer of copolyether glycol, 1,5-pentanediol, and 1,6-hexanediol in a weight ratio of 4:1.

[0076] Example 16

[0077] Example 16 differs from Example 9 in that the polyol consists of a polymer of polycaprolactone diol, 1,5-pentanediol, and 1,6-hexanediol, copolyether glycol in a weight ratio of 1.5:1:2.5.

[0078] Example 17

[0079] Example 17 differs from Example 16 in that the isocyanate is a polymethylene polyphenyl polyisocyanate.

[0080] Example 18

[0081] Example 18 differs from Example 16 in that the isocyanate consists of modified diphenylmethane-4,4' diisocyanate and polymethylene polyphenyl polyisocyanate in a weight ratio of 2.8:4.

[0082] Example 19

[0083] Example 19 differs from Example 16 in that the isocyanate consists of modified diphenylmethane-4,4' diisocyanate and polymethylene polyphenyl polyisocyanate in a weight ratio of 3.8:3.

[0084] Example 20

[0085] Example 20 differs from Example 16 in that the isocyanate consists of modified diphenylmethane-4,4' diisocyanate and polymethylene polyphenyl polyisocyanate in a weight ratio of 4.8:2.

[0086] Example 21

[0087] Example 21 differs from Example 1 in that the isocyanate is hexamethylene diisocyanate.

[0088] Comparative Example

[0089] Comparative Example 1

[0090] Comparative Example 1 differs from Example 1 in that the modifier is replaced with solvent.

[0091] Comparative Example 2

[0092] Comparative Example 2 differs from Example 1 in that the 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene is replaced with polyethylene glycol acrylate (polyethylene glycol is 200 average molecular weight).

[0093] Comparative Example 3

[0094] Comparative Example 3 differs from Example 1 in that the amount of modifier is 1 kg.

[0095] Performance Test

[0096] The microfiber fabrics obtained in Examples 1-20 and Comparative Examples 1-3 are subjected to the following performance tests.

[0097] Test Method / Testing Method

[0098] Breaking Strength

[0099] 1) The breaking strength of the microfiber fabrics obtained in Examples 1-20 and Comparative Examples 1-3 is tested according to GB / T3923.1-1997, and the data is recorded as N1;

[0100] 2) Configure artificial rainwater: 10 g / L sodium sulfate, 8 g / L sodium nitrate, 5 g / L sodium chloride, 977 g / L water are mixed uniformly to obtain a mixed solution, 50% sulfuric acid solution is added, and the pH value of the mixed solution is adjusted to 5.6 to obtain artificial rainwater.

[0101] The microfiber fabrics obtained in Examples 1-20 and Comparative Examples 1-3 are cut into test samples and soaked in artificial rainwater, and soaked at 30°C for 72h, after taking out, put into 50°C oven for drying 2h, then test the breaking strength according to GB / T3923.1-1997, the breaking strength is recorded as N2, and the breaking strength residual rate is calculated as (N2 / N1)*100%.

[0102] The above experiments are tested 3 times, and the average value is taken, and the specific data is shown in Table 3;

[0103] Table 3 Experimental data of Examples 1-20 and Comparative Examples 1-3

[0104]

[0105]

[0106] It can be seen from the combination of Example 1 and Comparative Examples 1-3 and Table 1 that the breaking strength and breaking strength residual of Comparative Examples 1-3 are lower than that of Example 1, indicating that the use of the modifier of the application can make the polyurethane sizing solution have better adhesion, and the elastic filling structure after curing and forming cooperates with the non-woven fabric blank to make the superfine fabric prepared have better breaking strength, reduce the possibility of damage, and have better rainwater erosion resistance, reduce the possibility of damage after soaking in rainwater.

[0107] It can be seen from the combination of Example 2 and Example 9 and Table 1 that the breaking strength and breaking strength residual of Example 2 are lower than that of Example 9, indicating that the use of alkyl acrylate phosphate, o-phenylphenoxyethyl acrylate, and 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene in the application has a synergistic effect, thereby making the obtained superfine fabric for new energy vehicle interior have better breaking strength and rainwater resistance, reducing the possibility of damage.

[0108] It can be seen from the combination of Example 9 and Example 16 and Table 1 that the breaking strength and breaking strength residual of Example 9 are lower than that of Example 16, indicating that the use of poly(caprolactone diol), 1,5-pentanediol and 1,6-hexanediol polymer, and copolyether glycol in the application has a better effect, making the breaking strength and rainwater erosion resistance of the superfine fabric better, thereby reducing the possibility of damage of the superfine fabric for new energy vehicle interior after soaking in rainwater.

[0109] It can be seen from the combination of Example 16 and Examples 18-20 and Table 1 that the breaking strength and breaking strength residual of Example 16 are lower than that of Examples 18-20, indicating that the use of modified diphenylmethane-4,4'-diisocyanate and polymethylene polyphenyl polyisocyanate has a better synergistic effect, thereby reducing the possibility of damage of the superfine fabric after soaking in rainwater.

[0110] The specific embodiments are merely an explanation of the application, and are not a limitation of the application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, as long as the modifications are within the scope of the claims of the application.

Claims

1. A new energy vehicle interior decoration microfiber fabric resistant to breaking, comprising a non-woven fabric blank and an elastic filling structure filled in the non-woven fabric blank, characterized in that, The elastic filling structure is obtained by curing a polyurethane impregnating solution prepared from the following raw materials by weight: 7-13 parts of polyol, 1-3 parts of emulsifier, 5-8 parts of isocyanate, 3-5 parts of chain extender, 0.2-0.5 parts of ammonium persulfate, 3-8 parts of modifier, 60-80 parts of solvent, 3-7 parts of other additives; The modifier is one or more of alkyl acrylate phosphate, o-phenylphenoxyethyl acrylate and 9,9-bis[4-(2-acryloyloxyethoxy) phenyl] fluorene; The polyol is one or more of polycaprolactone diol, polymer of 1,5-pentanediol and 1,6-hexanediol, and copolyether glycol; The isocyanate is modified diphenylmethane-4,4' diisocyanate and / or polymethylene polyphenyl polyisocyanate; The other additives are one or more of fillers, thickeners and pigments.

2. The new energy vehicle interior superm Microfiber fabric according to claim 1, characterized in that: The weight ratio of the alkyl acrylate phosphate, o-phenylphenoxyethyl acrylate and 9,9-bis[4-(2-acryloyloxyethoxy) phenyl] fluorene is 1: (1.2-1.8): (2-3.2).

3. The new energy vehicle interior superm Microfiber fabric of claim 1, wherein: The weight ratio of the modified diphenylmethane-4,4' diisocyanate and polymethylene polyphenyl polyisocyanate is (0.7-1.2): (0.5-1).

4. The new energy vehicle interior superm Microfiber fabric of claim 1, wherein: The chain extender is 1,4-butanediol or 1,6-hexanediol.

5. The new energy vehicle interior superm Microfiber fabric of claim 1, wherein: The emulsifier is OP-10 and / or OP-20.

6. The new energy vehicle interior superm Microfiber fabric of claim 1, wherein: The fillers are one or more of nano-zinc oxide, white carbon black, zirconium oxide and nano-hexagonal boron nitride; the thickener is EVA emulsion and / or EAA emulsion.

7. A preparation method of the new energy vehicle interior resistant broken microfiber fabric according to any one of claims 1-6, characterized in that, The polyurethane impregnating solution is prepared by the following method: The polyurethane impregnating solution is prepared by the following method: polyol is heated and dehydrated under vacuum, isocyanate is added, reaction, cooling, chain extender is added, continuous reaction, pre-polymer is obtained, modifier is added, reaction, emulsifier and solvent are added after reaction, stirring and dispersion, dispersion is obtained, ammonium persulfate is added, stirring is uniform, reaction is completed, ammonia is added for neutralization, other additives are added, mixing is uniform, and the polyurethane impregnating solution is obtained; Needle punching: the island fibers are dispersed, and then accumulated into a fiber layer, and after needle punching, a non-woven fabric blank is obtained; Impregnation: the non-woven fabric blank is immersed in the impregnating solution for impregnation treatment, and after curing, the non-woven fabric blank is filled with an elastic filling structure, and the superfine fabric is obtained.

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