A method for preparing a high tear-resistant and impermeable material

Abstract

This invention discloses a method for preparing a high tear-resistant and impermeable material. The method includes the following steps: 1) treating a mesh fabric with a base fabric protectant to obtain mesh fabric A; 2) placing mesh fabric A in an environment of 75-80℃ to dry the moisture; 3) applying polyether PU adhesive A to mesh fabric A; 4) applying polyether PU adhesive B to mesh fabric B; 5) laminating mesh fabric C with a resin material through a casting or calendering process, and then heat-sealing both sides of the mesh fabric width after casting to further prevent liquid penetration. This invention treats the mesh fabric with a base fabric protectant to first protect the yarn, which reduces the penetration of PU adhesive and improves the tear strength of the product; by treating the edges of the yarn with resin, it protects them and improves the impermeability of the material.

Description

Technical Field

[0001] This invention belongs to the field of composite materials, and specifically relates to a method for preparing a high tear-resistant and impermeable material. Background Technology

[0002] Many composite materials are available on the market that can be used to hold liquids such as water or oil. However, these composite materials have a problem: the liquid can seep through the fabric seams. This seepage can reduce the material's peel strength or even cause the entire material to break down, leading to unpredictable consequences for its use.

[0003] Liquid seepage can be caused by insufficient interaction between the composite fabric and the liquid, or by defects in the fabric itself, such as tears or damage. As liquid seeps into the fabric seams, it accumulates, increasing the challenge of peel strength. This means the material may peel off during use, leading to its failure.

[0004] Therefore, the yarns of the base fabric need to be protected. One attempt was to use polyether PU adhesive to impregnate the base fabric, ensuring full contact between the base fabric and PU to prevent oil or water penetration. However, commercially available polyether PU adhesives are corrosive, and most use strong solvents such as DMF / toluene. While these solvents have strong dissolving power, they also have high boiling points, requiring temperatures above 130°C to evaporate. This necessitates raising the machine temperature during production, and the fabric's properties decrease exponentially with increasing temperature. Furthermore, completely binding the PU yarns together presents a significant problem: a substantial reduction in tear strength. After PU impregnation, the fabric is entirely covered in PU adhesive, which is quite hard. This binding prevents slippage and reduces tear strength. Experimental data showed that the tear strength of a normal base fabric impregnated with PU was reduced by 50% compared to an unimpregnated base fabric, making this approach unacceptable. Summary of the Invention

[0005] In order to solve the above-mentioned problems in the prior art, the purpose of this invention is to provide a method for preparing a high tear-resistant and impermeable material.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A method for preparing a high tear-resistant and impermeable material includes the following steps:

[0008] 1) The mesh fabric is treated with a base fabric protective agent to obtain mesh fabric A.

[0009] 1-1) Preparation of base fabric protective agent: 5-30% refined mineral oil, 0.1-3% silicone surfactant, 0.1-2% sulfonate surfactant, 70-95% water, the total of the above components is 100%;

[0010] 1-2) Stir the base fabric protective agent evenly and pour it into a constant temperature water bath at 50℃-60℃. Keep the constant temperature water bath in a constant temperature water bath state and immerse the mesh fabric in the constant temperature water bath first to make the surface of the base fabric have a thin oil film. Then send the mesh fabric into the drying oven at 80-90℃, at a speed of 4-8m / min, and at a dwell time of 3-8min to obtain mesh fabric A.

[0011] 2) Place mesh fabric A in an environment of 75~80℃ for 7-8 days to dry the moisture;

[0012] 3) Apply polyether PU adhesive A to mesh fabric A.

[0013] 3-1) Preparation of polyether PU adhesive A: 100 parts polyether PU adhesive, 2-10 parts crosslinking agent, 10-50 parts diluent, viscosity 800-5000cps;

[0014] The polyether PU adhesive contains a low-boiling-point solvent with a boiling point of 40-80℃; the diluent is a methyl ethyl ketone and ethyl acetate complex with a weight ratio of 6:4.

[0015] 3-2) Pour polyether PU adhesive A into the dip tank. The temperature of the dip tank is controlled below 30℃. Pass the mesh fabric A through the dip tank for 1-2 seconds. The adhesive weight is controlled at 20-60 gsm.

[0016] 3-3) The mesh fabric is fed into the drying oven at a temperature of 83-95℃ and a speed of 4-8m / min. The dwell time in the oven is 3-8min to obtain mesh fabric B.

[0017] 4) Apply polyether PU adhesive B to the mesh fabric B.

[0018] 4-1) Preparation of polyether PU adhesive B: 100 parts polyether PU adhesive, 6-15 parts crosslinking agent, 15-30 parts diluent, viscosity 3-8 wcps;

[0019] The polyether PU adhesive contains a low-boiling-point solvent with a boiling point of 40-80℃; the diluent is a methyl ethyl ketone and ethyl acetate complex with a weight ratio of 6:4.

[0020] 4-2) Apply polyether PU adhesive B to both sides of mesh fabric B using a coating knife coating process. The adhesive weight is controlled at 30-50 gsm. Then, send mesh fabric B into an oven at a temperature of 85-95℃ and a speed of 5-15 m / min. The oven dwell time is 4-7 min to obtain mesh fabric C.

[0021] 5) The mesh fabric C is combined with resin material through casting or calendering process. After casting, the two sides of the mesh fabric width are heat-sealed to further prevent liquid penetration.

[0022] The resin materials used in casting or calendering include TPU / TPV / PVC / TPEE and other materials.

[0023] Before lamination, the mesh fabric is preheated at a temperature of 80-120℃ for 1-3 seconds. The casting temperature is 170-200℃. Before lamination, the mesh fabric needs to be cut off in advance and the edges sealed with film to ensure that the liquid does not penetrate.

[0024] The present invention has the following beneficial effects:

[0025] 1. Step 1) Treat the mesh fabric with a base fabric protectant to first protect the yarn, which can reduce the penetration of PU adhesive. By wrapping the yarn with a layer of PU, the yarn is not damaged, thus improving the tear strength of the product. The PU coating on the yarn forms a protective film, which prevents liquid materials from penetrating through the fabric gaps, thereby protecting the composite material from liquid damage.

[0026] 2. By applying resin to the edge of the yarn in step 5), a secondary protection is provided, which improves the anti-permeability of the material. Detailed Implementation

[0027] In the following examples, the polyether PU adhesive was purchased from Jiaxing Dingsu Chemical Co., Ltd., and its brand name is DS-1160. The solvent contained in this polyether PU adhesive is a low-boiling-point solvent with a boiling point of 40-80℃. Example 1

[0028] A method for preparing a high tear-resistant and impermeable material includes the following steps:

[0029] 1) The mesh fabric is treated with a base fabric protective agent to obtain mesh fabric A.

[0030] 1-1) Preparation of base fabric protective agent: 10% refined mineral oil, 0.5% silicone surfactant, 0.5% sulfonate surfactant, 89% water;

[0031] 1-2) Stir the base fabric protective agent evenly and pour it into a 50℃ constant temperature water bath. Keep the constant temperature water bath under continuous stirring. First, immerse the mesh fabric in the constant temperature water bath to make the surface of the base fabric have a thin oil film. Then, send the mesh fabric into the drying oven. The drying oven temperature is 80℃, the speed is 4m / min, and the drying time is 8min to obtain mesh fabric A.

[0032] 2) Place mesh A in an environment of 80℃ for 8 days to dry the moisture;

[0033] 3) Apply polyether PU adhesive A to mesh fabric A.

[0034] 3-1) Preparation of polyether PU adhesive A: 100 parts polyether PU adhesive, 2 parts crosslinking agent, 10 parts diluent, viscosity of 800 cps; wherein, the diluent is a methyl ethyl ketone and ethyl acetate complex with a weight ratio of 6:4.

[0035] 3-2) Pour polyether PU adhesive A into the dip-binding tank. The temperature of the dip-binding tank is controlled below 30℃. Pass the mesh fabric A through the dip-binding tank for 1 second. The adhesive weight is controlled at 30gsm.

[0036] 3-3) The mesh fabric is fed into the drying oven at a temperature of 83℃, a speed of 4m / min, and a dwell time of 8min to obtain mesh fabric B;

[0037] 4) Apply polyether PU adhesive B to the mesh fabric B.

[0038] 4-1) Preparation of polyether PU adhesive B: 100 parts polyether PU adhesive, 6 parts crosslinking agent, 15 parts diluent, viscosity of 3 wcps; wherein, the diluent is a methyl ethyl ketone and ethyl acetate complex with a weight ratio of 6:4.

[0039] 4-2) Apply polyether PU adhesive B to both sides of mesh fabric B using a coating knife coating process. The adhesive weight is controlled at 30 gsm. Then, mesh fabric B is sent into an oven at a temperature of 85℃, a speed of 5 m / min, and a dwell time of 7 min to obtain mesh fabric C.

[0040] 5) Preheat the mesh fabric to 80℃ for 3 seconds. Then, combine the mesh fabric C with TPU through casting or calendering processes at a casting temperature of 170℃. After casting, heat seal both sides of the mesh fabric width to further prevent liquid penetration.

[0041] Before lamination, the mesh fabric needs to be cut off in advance and the edges sealed with film to ensure that the liquid does not penetrate. Example 2

[0042] A method for preparing a high tear-resistant and impermeable material includes the following steps:

[0043] 1) The mesh fabric is treated with a base fabric protective agent to obtain mesh fabric A.

[0044] 1-1) Preparation of base fabric protective agent: 20% refined mineral oil, 1.5% silicone surfactant, 1% sulfonate surfactant, and 77.5% water;

[0045] 1-2) Stir the base fabric protective agent evenly and pour it into a 55℃ constant temperature water bath. Keep the constant temperature water bath under continuous stirring. First, immerse the mesh fabric in the constant temperature water bath to make the surface of the base fabric have a thin oil film. Then, send the mesh fabric into the drying oven. The drying oven temperature is 85℃, the speed is 6m / min, and the drying time is 5min to obtain mesh fabric A.

[0046] 2) Place mesh fabric A in an environment of 80℃ for 7 days to dry the moisture;

[0047] 3) Apply polyether PU adhesive A to mesh fabric A.

[0048] 3-1) Preparation of polyether PU adhesive A: 100 parts polyether PU adhesive, 5 parts crosslinking agent, 30 parts diluent, viscosity of 2000 cps; wherein, the diluent is a methyl ethyl ketone and ethyl acetate complex with a weight ratio of 6:4.

[0049] 3-2) Pour polyether PU adhesive A into the dip-binding tank. The temperature of the dip-binding tank is controlled below 30℃. Pass the mesh fabric A through the dip-binding tank for 2 seconds. The adhesive weight is controlled at 40gsm.

[0050] 3-3) The mesh fabric is fed into the drying oven at a temperature of 87℃ and a speed of 6m / min. The dwell time in the oven is 5min to obtain mesh fabric B.

[0051] 4) Apply polyether PU adhesive B to the mesh fabric B.

[0052] 4-1) Preparation of polyether PU adhesive B: 100 parts polyether PU adhesive, 10 parts crosslinking agent, 20 parts diluent, viscosity of 5 wcps; wherein, the diluent is a methyl ethyl ketone and ethyl acetate complex with a weight ratio of 6:4.

[0053] 4-2) Apply polyether PU adhesive B to both sides of mesh fabric B using a coating knife coating process. The adhesive weight is controlled at 40 gsm. Then, mesh fabric B is sent into an oven at a temperature of 90℃, a speed of 10 m / min, and a dwell time of 5 min to obtain mesh fabric C.

[0054] 5) Preheat the mesh fabric to 100℃ for 2 seconds. Then, combine the mesh fabric C with TPV through casting or calendering processes at a casting temperature of 185℃. After casting, heat seal both sides of the mesh fabric width to further prevent liquid penetration.

[0055] Before lamination, the mesh fabric needs to be cut off in advance and the edges sealed with film to ensure that the liquid does not penetrate. Example 3

[0056] A method for preparing a high tear-resistant and impermeable material includes the following steps:

[0057] 1) The mesh fabric is treated with a base fabric protective agent to obtain mesh fabric A.

[0058] 1-1) Preparation of base fabric protective agent: 27% refined mineral oil, 2% silicone surfactant, 1% sulfonate surfactant, 70% water;

[0059] 1-2) Stir the base fabric protective agent evenly and pour it into a 60℃ constant temperature water bath. Keep the constant temperature water bath under continuous stirring. First, immerse the mesh fabric in the constant temperature water bath to make the surface of the base fabric have a thin oil film. Then, send the mesh fabric into the drying oven. The drying oven temperature is 90℃, the speed is 8m / min, and the drying time is 3min to obtain mesh fabric A.

[0060] 2) Place mesh A in an environment of 80℃ for 8 days to dry the moisture;

[0061] 3) Apply polyether PU adhesive A to mesh fabric A.

[0062] 3-1) Preparation of polyether PU adhesive A: 100 parts polyether PU adhesive, 10 parts crosslinking agent, 50 parts diluent, viscosity of 4500 cps; wherein, the diluent is a methyl ethyl ketone and ethyl acetate complex with a weight ratio of 6:4.

[0063] 3-2) Pour polyether PU adhesive A into the dip-binding tank. The temperature of the dip-binding tank is controlled below 30℃. Pass the mesh fabric A through the dip-binding tank for 1.5s. The adhesive weight is controlled at 60gsm.

[0064] 3-3) The mesh fabric is fed into the drying oven at a temperature of 95℃ and a speed of 8m / min. The dwell time in the oven is 3min to obtain mesh fabric B.

[0065] 4) Apply polyether PU adhesive B to the mesh fabric B.

[0066] 4-1) Preparation of polyether PU adhesive B: 100 parts polyether PU adhesive, 15 parts crosslinking agent, 30 parts diluent, viscosity of 7 wcps; wherein, the diluent is a methyl ethyl ketone and ethyl acetate complex with a weight ratio of 6:4.

[0067] 4-2) Apply polyether PU adhesive B to both sides of mesh fabric B using a coating knife coating process. The adhesive weight is controlled at 30-50 gsm. Then, send mesh fabric B into an oven at a temperature of 5℃, a speed of 15 m / min, and a dwell time of 4 min to obtain mesh fabric C.

[0068] 5) Preheat the mesh fabric at 120℃ for 1 second. Then, combine the mesh fabric C with TPEE through casting or calendering at 200℃. After casting, heat seal both sides of the mesh fabric width to further prevent liquid penetration.

[0069] Before lamination, the mesh fabric needs to be cut off in advance and the edges sealed with film to ensure that the liquid does not penetrate.

Claims

1. A method for preparing a high tear-resistant and impermeable material, characterized in that, Includes the following steps: 1) The mesh fabric is treated with a base fabric protective agent to obtain mesh fabric A. 1-1) Preparation of base fabric protective agent: 5-30% refined mineral oil, 0.1-3% silicone surfactant, 0.1-2% sulfonate surfactant, 70-95% water, the total of the above components is 100%; 1-2) Stir the base fabric protective agent evenly and pour it into a constant temperature water bath at 50℃-60℃. Keep the constant temperature water bath in a constant temperature water bath state. First, immerse the mesh fabric in the constant temperature water bath, and then send the mesh fabric into the drying oven to obtain mesh fabric A. 2) Place the mesh fabric A in an environment of 75~80℃ to dry the moisture; 3) Apply polyether PU adhesive A to mesh fabric A. 3-1) Preparation of polyether PU adhesive A: 100 parts polyether PU adhesive, 2-10 parts crosslinking agent, 10-50 parts diluent; 3-2) Pour polyether PU adhesive A into the padding tank. The temperature of the padding tank is controlled below 30℃. Pass the mesh fabric A through the padding tank for 1-2 seconds. The adhesive weight is controlled at 20-60 gsm. 3-3) Place mesh fabric A into an oven and dry it to obtain mesh fabric B; 4) Apply polyether PU adhesive B to the mesh fabric B. 4-1) Preparation of polyether PU adhesive B: 100 parts polyether PU adhesive, 6-15 parts crosslinking agent, 15-30 parts diluent; 4-2) Apply polyether PU adhesive B to both sides of mesh fabric B using a coating knife coating process, with the adhesive weight controlled at 30-50 gsm. Then, send mesh fabric B into an oven to dry and obtain mesh fabric C. 5) The mesh fabric C is combined with resin material through casting or calendering process. After casting, the two sides of the mesh fabric width are heat-sealed to further prevent liquid penetration.

2. The method for preparing a high tear-resistant and impermeable material according to claim 1, characterized in that, In steps 1-2), the oven temperature is 80-90℃, the speed is 4-8m / min, and the oven dwell time is 3-8min.

3. The method for preparing a high tear-resistant and impermeable material according to claim 1, characterized in that, In step 3-1), the diluent is a methyl ethyl ketone and ethyl acetate complex with a weight ratio of 6:4, and the viscosity of polyether PU adhesive A is 800-5000 cps.

4. The method for preparing a high tear-resistant and impermeable material according to claim 1, characterized in that, In step 3-3), the oven temperature is 83-95℃, the speed is 4-8m / min, and the oven dwell time is 3-8min.

5. The method for preparing a high tear-resistant and impermeable material according to claim 1, characterized in that, In step 4-2), the oven temperature is 85-95℃, the speed is 5-15m / min, and the oven dwell time is 4-7min.

6. The method for preparing a high tear-resistant and impermeable material according to claim 1, characterized in that, In step 5), the resin material used for casting or calendering is TPU, TPV, PVC, or TPEE.

7. The method for preparing a high tear-resistant and impermeable material according to claim 1, characterized in that, In step 5), the mesh fabric is preheated before lamination. The preheating temperature is 80-120℃, the preheating time is 1-3s, and the casting temperature is 170-200℃.