Production process of high-breathability and heat-dissipation non-woven fabric and product thereof

Abstract

The application relates to the technical field of non-woven fabric production processes, in particular to a high-breathability and high-heat-dissipation non-woven fabric production process and a product thereof. The process comprises the following steps: opening and mixing superfine short fibers, uniformly feeding, carding into a web, cross-laying, needling, glue dipping, drying and winding to obtain the high-breathability and high-heat-dissipation non-woven fabric; wherein the needling process comprises three processes, the needle density of the needle plate cloth in the first process is 2000-3000 pieces per meter, the needle density of the needle plate cloth in the second process is 10000-11000 pieces per meter, the needle density of the needle plate cloth in the third process is 12000-13000 pieces per meter, and the front and back surfaces of the needle plate cloth need to be needled to obtain the grey cloth; the superfine short fibers are obtained by mixing PET short fibers, polypropylene short fibers and polyamide short fibers; the water-based polyurethane glue solution contains nano graphene. The process makes the high-breathability and high-heat-dissipation non-woven fabric have good breathability, heat dissipation, waterproofness, tensile strength, tear resistance and wear resistance.

Description

Technical Field

[0001] This application relates to the field of nonwoven fabric production technology, and in particular to a high-breathability and heat-dissipating nonwoven fabric production process and its products. Background Technology

[0002] Currently available car seats primarily use natural leather, fabric, and synthetic leather. Natural leather enhances a car's perceived quality and is easy to clean; however, it requires a series of physical and chemical treatments before it can be used in car seats, making it generally more expensive. Therefore, it's primarily used in high-end cars. Fabric car seats are inexpensive and suitable for most cars; however, they are prone to accumulating dirt and have poor water resistance. Synthetic leather offers a texture similar to natural leather at a lower price, is easy to clean, and has good water resistance, making it one of the most widely used materials today.

[0003] However, artificial leather has poor breathability and heat dissipation. When a car is exposed to the sun, the interior temperature rises, causing the surface temperature of the car seats to also rise. The seats become so hot that it takes a long time for them to cool down before one can sit down. Therefore, improvements are needed. Summary of the Invention

[0004] To address the poor breathability and heat dissipation of artificial leather, a production process and product for highly breathable and heat-dissipating nonwoven fabric have been developed.

[0005] Firstly, this application provides a manufacturing process for a highly breathable and heat-dissipating nonwoven fabric, employing the following technical solution:

[0006] A manufacturing process for a highly breathable and heat-dissipating nonwoven fabric includes the following steps:

[0007] The process involves opening and mixing ultrafine short fibers, feeding them evenly, combing them into a web, cross-laying the web, needle punching, impregnating with resin, drying, and winding them up to obtain a highly breathable and heat-dissipating nonwoven fabric.

[0008] The needle-punching process consists of three steps: in the first step, the needle density of the needle plate fabric is 2,000-3,000 needles / meter; in the second step, the needle density of the needle plate fabric is 10,000-11,000 needles / meter; and in the third step, the needle density of the needle plate fabric is 12,000-13,000 needles / meter. Needling is required on both sides to obtain the greige fabric.

[0009] The ultrafine short fibers are obtained by mixing PET short fibers, polypropylene short fibers and polyamide short fibers;

[0010] The aqueous polyurethane adhesive contains nano-graphene.

[0011] By adopting the above technical solution, a highly breathable and heat-dissipating nonwoven fabric is obtained, exhibiting excellent breathability and heat dissipation, and a texture close to genuine leather. The highly breathable and heat-dissipating nonwoven fabric prepared in this application can quickly dissipate heat after exposure to sunlight, without requiring a prolonged period. In hot weather, people tend to sweat when sitting on chairs, especially on the parts in contact with the seat. If sweat cannot be discharged in time, it can corrode the seat and shorten its lifespan. The nonwoven fabric prepared in this application has relatively dense gaps and a loose arrangement, which improves the breathability of the nonwoven fabric and facilitates the discharge of sweat.

[0012] In this application, a mixed fiber is prepared by combining PET short fibers, polypropylene short fibers, and polyamide short fibers. This allows the nonwoven fabric to form a network structure filled with pores, allowing gas to pass through but water to not, thereby improving its breathability. Simultaneously, this also aims to improve the tensile strength, tear resistance, and structural stability of the fabric, and to make its texture closer to genuine leather.

[0013] PET staple fibers can improve the hand feel and elasticity of the fabric, but they have poor air permeability. This issue can be addressed by forming a network structure with polypropylene and polyamide staple fibers to improve the air permeability of the nonwoven fabric. Additionally, polyamide staple fibers have good elasticity and are lightweight, which can improve the softness of highly breathable and heat-dissipating nonwoven fabrics. Polypropylene staple fibers have good strength, improving the tensile strength, tear resistance, and abrasion resistance of the nonwoven fabric.

[0014] The physical properties of PET staple fiber, polypropylene staple fiber and polyamide staple fiber are quite different, making them difficult to mix evenly. In this application, the three are mixed to the maximum extent by opening and mixing, and then the opening process is carried out to obtain a nonwoven fabric with a uniform and stable structure.

[0015] To better blend PET staple fiber, polypropylene staple fiber, and polyamide staple fiber, and improve the heat dissipation and breathability of the nonwoven fabric, the preferred opening and mixing process is as follows: the raw materials are fed into a coarse opening machine for coarse opening, and then fed into a fine opening machine for thorough opening and pre-carding, further opening and straightening the fibers. The speed of the coarse opening machine is 1000-1250 r / min, and the speed of the fine opening machine is 1400-1500 r / min.

[0016] The three-stage needle-punching process aims to stabilize the structure of the highly breathable and heat-dissipating nonwoven fabric, improve its abrasion resistance and strength, making it less prone to wear and tear during use, and ensuring it maintains good breathability and heat dissipation for a long time. The first process is to set the shape of the web fibers to prevent changes in the direction of the web fibers during subsequent preparation; the second process is to reinforce the web fibers to form a structurally stable fabric; the third needle-punching process is to make the surface of the fabric smooth, free of burrs and bone marks.

[0017] In this application, the fabric is soaked in an aqueous polyurethane adhesive for two reasons: first, to improve the feel of the highly breathable and heat-dissipating nonwoven fabric, making its texture similar to genuine leather; and second, to improve the heat dissipation performance of the nonwoven fabric. Graphene, a material with excellent thermal conductivity, is added to the polyurethane adhesive, which significantly enhances the heat dissipation performance of the nonwoven fabric and also improves the adhesion of the aqueous polyurethane adhesive to the fabric.

[0018] Preferably, the aqueous polyurethane adhesive is prepared by the following method:

[0019] 1) After dissolving graphene in diethyl ether, soybean oil and alkaline catalyst are added, the temperature is raised to 50-60℃, and heated for 1-2 hours to obtain a graphene solution.

[0020] 2) Place polyester polyol, polyisocyanate, and diamine chain extender in a reactor, raise the temperature to 80-90℃, and react for 3-4 hours to obtain oligomer A;

[0021] 3) Then place oligomer A, diol chain extender and graphene solution in a reactor and raise the temperature to 100-110℃, react for 3-5 hours to obtain mixture B;

[0022] 4) Place mixture B, water, emulsifier and alkanolamine chain extender in a reactor, raise the temperature to 50-70℃, react for 3-4 hours, recover the diethyl ether, and obtain polyurethane adhesive.

[0023] Graphene is a material with good heat dissipation properties and can form a dense and robust network structure when used with waterborne polyurethane. However, graphene's strong hydrophobicity makes it prone to sedimentation in waterborne polyurethane adhesive systems, resulting in weak adhesion between the adhesive layer and the fabric during impregnation, thus affecting the heat dissipation performance of highly breathable and heat-dissipating nonwoven fabrics. In this application, graphene is first dissolved in diethyl ether, making it easier for it to react with soybean oil. This significantly improves graphene's hydrophilicity, preventing it from settling at the bottom of the waterborne polyurethane system and further enhancing the adhesion performance of the waterborne polyurethane adhesive.

[0024] Soybean oil contains a large number of hydroxyl and carboxyl groups, making it highly hydrophilic. By reacting soybean oil with graphene, the hydrophilicity of graphene is improved. The waterborne polyurethane adhesive prepared through steps 2), 3), and 4) exhibits good adhesion, system stability, and is less prone to delamination. It also forms films quickly and is easy to mold.

[0025] To improve the reaction efficiency between graphene and soybean oil, the preferred alkaline catalyst includes one of diethylamine, triethylamine, cyclohexylamine, or aniline.

[0026] In order to ensure that the waterborne polyurethane has good wear resistance after curing, the preferred diamine chain extender is one of 3,3'-dichloro-4,4'-diaminodiphenylmethane, 3,5-diamino-p-chlorobenzoate isobutyl ester, diethyltoluenediamine or 3,5-dimethylthiotoluenediamine.

[0027] To improve the adhesion of waterborne polyurethane to the fabric, preferably, the diol chain extender is one of 1,4-butanediol, ethylene glycol, propylene glycol, neopentyl glycol, propylene glycol, or trihydroxypropane.

[0028] Preferably, the alkanolamine chain extender includes one of ethanolamine, diethanolamine, or triethanolamine.

[0029] Preferably, the emulsifier is one of polyoxyethylene sorbitan fatty acid ester, nonylphenol polyoxyethylene ether, fatty acid polyoxyethylene ester, or castor oil polyoxyethylene ether.

[0030] Preferably, the polyisocyanate includes one of toluene diisocyanate, diphenylmethane-4,4'-diisocyanate, 1,6-hexane diisocyanate, isophorone cyanate, 4,4-dicyclohexylmethane diisocyanate or trimethylhexane diisocyanate.

[0031] Preferably, the raw materials used to prepare the waterborne polyurethane adhesive are shown in the following weight parts:

[0032]

[0033]

[0034] By adopting the above technical solution, the amount of raw materials used in preparing waterborne polyurethane adhesive is optimized, thereby improving the ability of waterborne polyurethane adhesive to adhere to the fabric and enhancing the heat dissipation performance of the nonwoven fabric after curing.

[0035] Preferably, the weight ratio of the polyester polyol to the polyisocyanate is (50-55):25.

[0036] By adopting the above technical solution and optimizing the amount of polyester polyol and polyisocyanate, the resulting oligomer A has good fluidity, which is conducive to promoting the next reaction and improving the adhesion performance of the waterborne polyurethane adhesive.

[0037] Preferably, the polyester polyol has a functionality of 2-5 and a molecular weight of 500-2000.

[0038] By adopting the above technical solutions, optimizing the functionality and molecular weight of polyester polyols, and improving the structural regularity of polyester polyols, the bonding performance of waterborne polyurethane adhesives can be further improved.

[0039] Preferably, the web layer formed in the carding step has a density of 15-30 g / m². 2 .

[0040] By adopting the above technical solution, it is beneficial to form a structurally stable fabric during the needle punching process, thereby improving the air permeability and heat dissipation of the nonwoven fabric.

[0041] Preferably, the number of mesh layers in the cross-laying step is 5-10.

[0042] By adopting the above technical solutions, the breathability and heat dissipation of the high-breathability and heat dissipation nonwoven fabric are improved, while maintaining the tear resistance, abrasion resistance and tensile strength of the high-breathability and heat dissipation nonwoven fabric.

[0043] Preferably, the fineness of PET short fibers is 0.3-0.5 dtex, the fineness of polypropylene short fibers is 0.5-0.7 dtex, and the fineness of polyamide short fibers is 0.4-0.8 dtex.

[0044] By adopting the above technical solution, the fineness of PET short fibers, polypropylene short fibers and polyamide short fibers is optimized, so that a network structure is formed during the needle punching process. The network structure constitutes dense pores, thereby improving the air permeability and heat dissipation of the nonwoven fabric.

[0045] Preferably, the weight ratio of the PET short fiber, the polypropylene short fiber and the polyamide short fiber is (10-15):(4-8):3.

[0046] By adopting the above technical solution and optimizing the amount of PET short fiber, polypropylene short fiber and polyamide short fiber, dense pores are formed inside the nonwoven fabric. These pores allow gas to pass through but not water, thereby improving the breathability and waterproof performance of the nonwoven fabric.

[0047] Secondly, this application provides a highly breathable and heat-dissipating nonwoven fabric, which adopts the following technical solution:

[0048] A highly breathable and heat-dissipating nonwoven fabric is prepared by the method described in the first aspect for preparing highly breathable and heat-dissipating nonwoven fabric.

[0049] By adopting the above technical solutions, the high-breathability and heat-dissipating nonwoven fabric has breathability, heat dissipation, waterproofness, tensile strength, tear resistance and wear resistance, and its feel is close to that of genuine leather, thus improving the comfort of using nonwoven fabric.

[0050] In summary, this application has the following beneficial effects:

[0051] 1. This application describes a highly breathable and heat-dissipating nonwoven fabric obtained by opening and mixing PET short fibers, polypropylene short fibers, and polyamide short fibers, uniformly feeding them, carding them into a web, cross-laying the web, needle punching, impregnating with resin, drying, and winding. During the needle punching process, the PET short fibers, polypropylene short fibers, and polyamide short fibers form a tight network structure. This network structure allows gas to pass through but not water, thereby improving the breathability and waterproof performance of the nonwoven fabric, as well as its tensile strength and tear resistance. During the impregnation process, an aqueous polyurethane adhesive containing graphene is used, allowing the nonwoven fabric to contain graphene, thus improving its heat dissipation performance.

[0052] 2. This application involves reacting soybean oil and graphene under an alkaline catalyst to obtain a graphene solution, reducing the hydrophobicity of graphite and ensuring its stable and uniform presence in the waterborne polyurethane adhesive. This improves the adhesion of the waterborne polyurethane adhesive to nonwoven fabrics, thereby enhancing the heat dissipation performance of the nonwoven fabrics. In preparing the waterborne polyurethane adhesive, this application first reacts polyester polyol, polyisocyanate, and diamine chain extender to obtain oligomer A, which improves the wear resistance of the cured waterborne polyurethane adhesive. Then, oligomer A, diol chain extender, and graphene solution are reacted to obtain mixture B, which improves the adhesion and heat dissipation performance of the waterborne polyurethane adhesive. Finally, mixture B, water, emulsifier, and alkanolamine chain extender are reacted to adjust the viscosity of the waterborne polyurethane adhesive, further enhancing its adhesion to nonwoven fabrics. Detailed Implementation

[0053] Example

[0054] Example 1

[0055] A manufacturing process for a highly breathable and heat-dissipating nonwoven fabric includes the following steps:

[0056] The process involves opening and mixing ultrafine short fibers, feeding them evenly, combing them into a web, cross-laying the web, needle punching, impregnating with resin, drying, and winding them up to obtain a highly breathable and heat-dissipating nonwoven fabric.

[0057] The opening and mixing process involves feeding ultrafine short fibers into a coarse opener for coarse opening, followed by a fine opener for thorough opening and pre-carding, further opening and straightening the fibers. The speed of the coarse opener is 1000 r / min, and the speed of the fine opener is 1400 r / min.

[0058] The needle-punching process consists of three steps: the needle density of the needle plate fabric in the first step is 2,000 needles / meter; the needle density of the needle plate fabric in the second step is 10,000 needles / meter; and the needle density of the needle plate fabric in the third step is 12,000 needles / meter. Needling is required on both the front and back sides to obtain the greige fabric.

[0059] The ultrafine short fiber is a mixture of 1.00 kg of PET short fiber, 0.40 kg of polypropylene short fiber and 0.30 kg of polyamide short fiber in a weight ratio of 10:4:3.

[0060] The waterborne polyurethane adhesive contains nano-graphene. 20.00g of nano-graphene is mixed evenly with 1000.00g of waterborne polyurethane adhesive. The solid content of the waterborne polyurethane adhesive is 40%, the viscosity (25℃) is 500cP, and the tensile strength after curing is 28MPa.

[0061] The fineness of PET microfiber is 0.3 dtex and the length is 38 mm.

[0062] The polypropylene short fibers have a fineness of 0.5 dtex and a length of 38 mm.

[0063] The polyamide short fiber has a fineness of 0.4 dtex and a length of 38 mm.

[0064] The difference between Examples 2-3 and Example 1 lies in the different amounts of some raw materials used, parameters, and experimental parameters in the preparation of the highly breathable and heat-dissipating nonwoven fabric. The specific differences in Examples 1-3 are shown in Table 1.

[0065] Table 1. Parameters of the production process for high-breathability and heat-dissipating nonwoven fabrics in Examples 1-3

[0066]

[0067]

[0068] Example 4

[0069] A production process for a highly breathable and heat-dissipating nonwoven fabric. The difference between this embodiment and Embodiment 1 is that the water-based polyurethane adhesive is prepared by the following method:

[0070] 1) Dissolve 20.00g of graphene in 100.00g of diethyl ether, then add 20.00g of soybean oil and 0.10g of alkaline catalyst (diethylamine), heat to 50℃ and heat for 1h to obtain a graphene solution;

[0071] 2) Place 400.00g of polyester polyol, 200.00g of polyisocyanate (toluene diisocyanate), and 0.10g of diamine chain extender (3,3'-dichloro-4,4'-diaminodiphenylmethane) in a reactor, raise the temperature to 80℃, and react for 3h to obtain oligomer A;

[0072] 3) Then, place oligomer A, 0.20 g of diol chain extender (1,4-butanediol) and graphene solution in a reactor, raise the temperature to 100°C, and react for 3 h to obtain mixture B;

[0073] 4) Place mixture B, water, 20.00g of emulsifier and 0.20g of ethanolamine chain extender in a reactor, raise the temperature to 50℃, react for 3h, recover the diethyl ether, and obtain the waterborne polyurethane adhesive.

[0074] The polyester polyol has a functionality of 2 and a molecular weight of 500.

[0075] The difference between Examples 5-6 and Example 4 lies in the different amounts of some raw materials used in the preparation of the waterborne polyurethane adhesive, as well as the different experimental parameters. The specific differences in Examples 4-6 are shown in Table 2.

[0076] Table 2 Parameters of the production process of waterborne polyurethane adhesives in Examples 4-6

[0077]

[0078]

[0079] Example 7

[0080] A production process for a highly breathable and heat-dissipating nonwoven fabric. The difference between this embodiment and Embodiment 4 is that the polyester polyol is 400.00g, the polyisocyanate is 145.50g, and the weight ratio of polyester polyol to polyisocyanate is 55:25. The other types and amounts of experimental raw materials and experimental steps are the same as in Embodiment 4.

[0081] Example 8

[0082] A production process for a highly breathable and heat-dissipating nonwoven fabric. The difference between this embodiment and embodiment 4 is that castor oil is used instead of an equal amount of soybean oil in step 1). The other types and amounts of experimental raw materials and experimental steps are the same as in embodiment 4.

[0083] Example 9

[0084] A production process for a highly breathable and heat-dissipating nonwoven fabric. The difference between this embodiment and embodiment 4 is that in step 1), ether is used instead of an equal amount of soybean oil. The other types and amounts of experimental raw materials and experimental steps are the same as in embodiment 4.

[0085] Example 10

[0086] A production process for a highly breathable and heat-dissipating nonwoven fabric. The difference between this embodiment and embodiment 4 is that graphene solution is added in step 2), while the other types and amounts of experimental raw materials and experimental steps are the same as in embodiment 4.

[0087] Example 11

[0088] A production process for a highly breathable and heat-dissipating nonwoven fabric. The difference between this embodiment and embodiment 4 is that graphene solution is added in step 4), while the other types and amounts of experimental raw materials and experimental steps are the same as in embodiment 4.

[0089] Example 12

[0090] A production process for a highly breathable and heat-dissipating nonwoven fabric. The difference between this embodiment and Embodiment 1 is that the fineness of the PET short fiber is 0.3 dtex, the fineness of the polypropylene short fiber is 0.3 dtex, and the fineness of the polyamide short fiber is 0.3 dtex. The other types and amounts of experimental raw materials and experimental steps are the same as in Embodiment 1.

[0091] Example 13

[0092] A production process for a highly breathable and heat-dissipating nonwoven fabric. The difference between this embodiment and Embodiment 1 is that the ultrafine short fibers are obtained by mixing 0.56 kg of PET short fibers, 0.56 kg of polypropylene short fibers and 0.56 kg of polyamide short fibers in a weight ratio of 1:1:1. The types and amounts of other test raw materials and test steps are the same as in Embodiment 1.

[0093] Comparative Example

[0094] Comparative Example 1

[0095] A nonwoven fabric production process is described. The difference between this comparative example and Example 1 is that polyurethane short fibers are used instead of an equal amount of polypropylene short fibers. The other types and amounts of experimental raw materials and experimental steps are the same as in Example 1.

[0096] The polyurethane short fibers have a fineness of 0.5 dext and a length of 38 mm.

[0097] Comparative Example 2

[0098] A nonwoven fabric production process is described. The difference between this comparative example and Example 1 is that polyurethane short fibers are used instead of an equal amount of polyamide short fibers. The other types and amounts of experimental raw materials and experimental steps are the same as in Example 1.

[0099] The polyurethane short fibers have a fineness of 0.4 dext and a length of 38 mm.

[0100] Comparative Example 3

[0101] A nonwoven fabric production process is described. The difference between this comparative example and Example 1 is that the needle density of the needle plate cloth in the second and third processes of needle punching is 10,000 needles / meter. The other types and amounts of experimental raw materials and experimental steps are the same as in Example 1.

[0102] Comparative Example 4

[0103] A nonwoven fabric production process is described. The difference between this comparative example and Example 1 is that the water-based polyurethane adhesive does not contain nano-graphene, while the other experimental raw materials, dosages, and experimental steps are the same as in Example 1.

[0104] Performance testing

[0105] Test methods and abrasion resistance tests were conducted on the high-breathability and heat dissipation nonwoven fabrics prepared in Examples 1-13 and the nonwoven fabrics prepared in Comparative Examples 1-4.

[0106] Detection methods / test methods

[0107] Air permeability: The air permeability was measured according to the Frazir method (Frazir type) of JIS-L1096. Five samples were taken for each example, and the average value was taken as the test result.

[0108] Heat dissipation: The high-breathability heat dissipation nonwoven fabrics prepared in Examples 1-13 and the nonwoven fabrics prepared in Comparative Examples 1-4 were placed in a heat preservation box at a temperature of 50°C. After 5 minutes, they were taken out and placed in a heat preservation box at a temperature of 25°C. The temperature was measured after 30 seconds.

[0109] Water resistance: Tested according to the standard operation of GB / T4745-1997 "Determination of water resistance of textile fabrics - Water stain test".

[0110] Test method for tear test: GB / T3917 Tongue tear (descent speed: 500mm / min; ascent speed: 500mm / min; initial length: 100mm; ambient temperature: 25℃; ambient humidity: 65%; predetermined elongation: 70mm; peak amplitude: 5N; warp tear: 68.1N; weft tear: 53.8N).

[0111] Abrasion Resistance Test: The abrasion resistance of nonwoven fabrics was determined according to JIS L 1096. The number of abrasion cycles was set at 20,000. The weight reduction rate after abrasion was used as the baseline, and the fabric was graded into five levels. The weight reduction rate (%) was expressed as {(original fabric weight - weight after abrasion) / (original fabric weight)} × 100. A weight reduction rate of 4% or higher was rated as level 3 or lower; 2% or higher but less than 4% was rated as level 4; and less than 2% was rated as level 5. Experimental data are shown in Table 3.

[0112] Table 3. Experimental data of Examples 1-13 and Comparative Examples 1-4

[0113]

[0114]

[0115] Based on Examples 1-13 and Comparative Examples 1-4, and in conjunction with Table 3, it can be seen that the high-breathability and heat-dissipating nonwoven fabric prepared by the preparation process in this application has good air permeability, heat dissipation, waterproofness, tensile strength, tear resistance, and abrasion resistance.

[0116] Compared with Comparative Examples 1-2, Example 1 showed better air permeability, heat dissipation, tensile strength, tear strength, and abrasion resistance. This indicates that by mixing PET short fibers, polypropylene end fibers, and polyamide short fibers, the air permeability, heat dissipation, tensile strength, tear strength, and abrasion resistance of the high-permeability and heat-dissipating nonwoven fabric can be improved.

[0117] Compared with Example 1, Comparative Example 3 showed that the air permeability, heat dissipation, waterproofness, tensile strength, tear strength and abrasion resistance of Comparative Example 3 were all weaker than those of Example 1. This indicates that by reasonably adjusting the needle punching density, it is beneficial to improve the air permeability, heat dissipation, waterproofness, tensile strength, tear strength and abrasion resistance of the high-breathability heat dissipation nonwoven fabric.

[0118] Compared with Comparative Example 4, the heat dissipation and wear resistance of Comparative Example 4 are significantly worse than those of Example 1, indicating that the addition of graphene can further improve the waterproof performance of the highly breathable and heat-dissipating nonwoven fabric and improve the adhesion of the water-based polyurethane adhesive.

[0119] Compared with Example 1, Example 4 showed a significantly higher temperature drop rate and greater wear resistance than Example 1, indicating that the waterborne polyurethane adhesive obtained by the preparation method of this application has good adhesion properties and can significantly improve the heat dissipation and heat resistance of nonwoven fabrics when used to prepare nonwoven fabrics.

[0120] Compared with Examples 8-11, Example 4 shows that the waterborne polyurethane adhesive prepared by the method of this application has a significantly improved performance in adhering to nonwoven fabrics, and can significantly improve the heat dissipation performance of nonwoven fabrics.

[0121] Compared with Examples 11-12, Example 1 demonstrates that by optimizing the fineness of PET short fibers, polypropylene short fibers, and polyamide short fibers, heat dissipation, tensile strength, and tear resistance can be further improved.

[0122] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A process for producing a high air permeable and heat dissipating nonwoven fabric, characterized by, The method comprises the following steps: The superfine short fibers are opened, mixed, evenly fed, carded, cross-laid, needled, dipped in glue, dried and wound to obtain the high-breathable and high-heat-dissipation non-woven fabric. The needle punching process comprises three processes, the first process uses a needle plate cloth with a needle density of 2000-3000 pieces per meter, the second process uses a needle plate cloth with a needle density of 10000-11000 pieces per meter, and the third process uses a needle plate cloth with a needle density of 12000-13000 pieces per meter, and the front and back surfaces of the needle plate cloth need to be needled to obtain the gray fabric. The superfine short fibers comprise PET short fibers, polypropylene short fibers and polyamide short fibers. The glue solution used for the glue dipping contains nanometer graphene. The water-based polyurethane glue solution is prepared by the following method: 1) After the graphene is dissolved in diethyl ether, soybean oil and an alkaline catalyst are added, the temperature is raised to 50-60 DEG C, and heating is performed for 1-2 hours to obtain a graphene solution; 2) The polyester polyol, polyisocyanate and diamin chain extender are placed in a reactor, the temperature is raised to 80-90 DEG C, and reaction is performed for 3-4 hours to obtain oligomer A; 3) The oligomer A, diol chain extender and graphene solution are placed in a reactor, the temperature is raised to 100-110 DEG C, and reaction is performed for 3-5 hours to obtain mixture B; 4) The mixture B, water, emulsifier and alcohol amine chain extender are placed in a reactor, the temperature is raised to 50-70 DEG C, and reaction is performed for 3-4 hours to recover diethyl ether and obtain the polyurethane glue solution; The weight parts of the raw materials used for preparing the water-based polyurethane glue solution are as follows: Graphene 2-4 parts Diethyl ether 10-15 parts Soybean oil 2-3 parts Alkaline catalyst 0.01-0.03 parts Polyester polyol 40-60 parts Polyisocyanate 20-30 parts Diamine chain extender 0.01-0.05 parts Dialcohol chain extender 0.02-0.04 parts Alcohol amine chain extender 0.02-0.05 parts Water 20-40 parts Emulsifier 2-5 parts The weight part ratio of the polyester polyol to the polyisocyanate is (50-55):

25.

2. The production process of the high-breathable and heat-dissipation non-woven fabric according to claim 1, characterized in that: The functionality of the polyester polyol is 2-5, and the molecular weight is 500-2000.

3. The production process of the high-breathable and heat-dissipation non-woven fabric according to claim 1, characterized in that: The web layer formed in the carding step is 15-30 g / m 2 .

4. The production process of the high-breathable and heat-dissipation nonwoven fabric according to claim 1, characterized in that, The number of layers of the cross-laid step is 5-10.

5. The process for producing a high air permeability and heat dissipation nonwoven fabric according to claim 1, wherein: The fineness of the PET short fibers is 0.3-0.5 dtex, the fineness of the polypropylene short fibers is 0.5-0.7 dtex, and the fineness of the polyamide short fibers is 0.4-0.8 dtex.

6. The process for producing a high air permeability and heat dissipation nonwoven fabric according to claim 1, wherein: The weight part ratio of the PET short fibers, the polypropylene short fibers and the polyamide short fibers is (10-15):(4-8):

3.

7. A highly air-permeable and heat-dissipating nonwoven fabric, characterized by: The high-breathable and high-heat-dissipation non-woven fabric is prepared by the high-breathable and high-heat-dissipation non-woven fabric production process of any one of claims 1-6.

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