TPU (thermoplastic polyurethane) foaming leather with sweat absorption function for racket handle and preparation method of TPU foaming leather

Abstract

The invention relates to the technical field of TPU (thermoplastic polyurethane), in particular to TPU foaming leather with a sweat absorbing function for a racket handle and a preparation method of the TPU foaming leather. The TPU foaming leather with the sweat absorption function for the racket handle comprises release paper and a TPU foaming film arranged on the upper end face of the release paper. The TPU foaming leather with the sweat absorption function for the racket handle has excellent moisture absorption and quick drying performance and dry and wet aging performance, also has the characteristics of good elongation and strong tensile property, still has a good static friction coefficient after absorbing water, well absorbs sweat produced by hands of athletes, and still has a good anti-skid effect after absorbing water. The preparation method of the TPU foaming leather with the sweat absorption function for the racket handle is simple in process, easy to control in operation and beneficial to industrial mass production, and the prepared TPU foaming leather with the sweat absorption function for the racket handle is stable in quality and excellent in comprehensive performance.

Description

Technical Field

[0001] The invention relates to the technical field of TPU, and in particular to TPU foamed leather for a racket handle and having a sweat-absorbing function and a preparation method thereof. Background Art

[0002] The sweat-absorbing belt of badminton and tennis racket is a special kind of textile products. First of all, it makes the user's grip more comfortable and firm, plays the effect of sweat absorption and anti-slip, and protects the inner handle leather and the handle material from wear and erosion. TPU film has been widely used at present. It has the characteristics of softness and good elasticity, and can be applied to various fabrics such as clothing, bags, tents, shoes, and other products. At the same time, the sweat-absorbing belt made of TPU foam leather has quite good ductility and elasticity, making the user's grip more comfortable and firm, and protecting the inner handle leather and the handle material from wear and erosion. However, the sweat-absorbing belt made of existing TPU foam leather has a general sweat-absorbing function, which cannot absorb the sweat of the hands of athletes due to sports, and after absorbing human sweat, it will cause the hands to slip or even the athletes to lose their hands, and cannot reduce the slippery feeling of the palm well, and cannot provide a good grip feeling and control force, which greatly reduces the user's experience and even affects the competition results. Therefore, the performance of the sweat-absorbing belt made of TPU film needs to be further improved. Summary of the invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a TPU foam leather for a racket handle with a sweat-absorbing function. The TPU foam leather for a racket handle with a sweat-absorbing function has excellent moisture absorption and quick-drying properties and wet and dry aging properties, and has the characteristics of good elongation and strong tensile performance, and still has a good static friction coefficient after absorbing water, that is, the TPU foam still has good friction properties after absorbing water, and can well absorb the sweat of the athletes' hands due to exercise, and still has a good anti-slip effect after absorbing water, providing users with a good grip feeling and control.

[0004] The preparation method of the TPU foamed leather for a racket handle with a sweat-absorbing function of the present invention is simple in process and easy to control in operation, which is conducive to large-scale industrial production. The prepared TPU foamed leather for a racket handle with a sweat-absorbing function has stable quality, excellent moisture absorption and quick-drying performance and dry and wet aging performance, and has the characteristics of good elongation and strong tensile performance, and still has a good static friction coefficient after absorbing water, and has excellent comprehensive performance.

[0005] The purpose of the present invention is achieved through the following technical solution: TPU foam leather for racket handle and having sweat absorption function comprises release paper and a TPU foam film arranged on the upper end surface of the release paper.

[0006] In the above technical solution, the thickness of the TPU foam film is 0.2-0.5 mm, and the density of the TPU foam film is 0.28-0.3 g / cm 3 .

[0007] In the above technical scheme, the TPU foam film includes the following raw materials in parts by weight: 7-14 parts of polyurethane acrylate, 80-120 parts of polyester TPU powder, 40-60 parts of ABS resin, 8-18 parts of sorbic acid, 4-8 parts of zinc oxide / silicon dioxide composite material, 0.8-1.2 parts of stearic acid, 1-3 parts of foaming agent, 1-3 parts of vulcanizing agent and 1-2 parts of antioxidant.

[0008] In the above technical solution, the mass fraction of butadiene in the ABS resin is 15-20%, the mass fraction of styrene is 15-25%, and the mass fraction of acrylonitrile is 25-30%.

[0009] In the above technical solution, the preparation method of each zinc oxide / silicon dioxide composite material comprises the following steps:

[0010] (1) At room temperature, 13-15 g of sodium silicate nonahydrate is added to 18-22 g of deionized water, stirred evenly and fully dissolved, and then 8-12 g of zinc oxide particles are added, followed by dropwise addition of 2.5-3.5 mol / L hydrochloric acid until the solution begins to gel, and then the addition of hydrochloric acid solution is stopped to obtain zinc oxide / silicon dioxide gel.

[0011] (2) 18-22 mL of acetone solution and 18-22 mL of anhydrous ethanol were added to the zinc oxide / silicon dioxide gel, and the mixture was soaked for 10-14 hours and then placed in an oven at 75-85° C. for drying for 3-5 hours. The oven temperature was then set to 115-125° C. for drying for 1.5-2.5 hours, and finally ground into powder to obtain a zinc oxide / silicon dioxide composite material.

[0012] In the above technical solution, the antioxidant is 2-mercaptobenzimidazole, the vulcanizing agent is diisopropylbenzene peroxide, and the foaming agent is bicarbonate.

[0013] In the above technical solution, the method for preparing TPU foam leather for racket handle with sweat absorption function is characterized by comprising the following steps:

[0014] (1) Pour polyester TPU powder, ABS resin, polyurethane acrylate, stearic acid, zinc oxide / silicon dioxide composite material, sorbic acid and antioxidant into a container according to weight parts, mix and stir evenly, and then place in a vacuum oven at 115-125° C. for 20-40 minutes to obtain a mixture A;

[0015] (2) at room temperature, adding a blowing agent and a vulcanizing agent to the mixture A and stirring evenly to obtain a mixture B;

[0016] (3) The mixture B is fed into the hopper of a casting machine, and is heated at 175-210° C. by the casting machine to obtain a TPU molten mixture, which is then pushed by a rotating screw, extruded from the die head of the casting machine, and cast onto the upper end of the release paper, so that a TPU foam film is attached to the release paper. The TPU foam film is pressed and cooled by a pressure roller to obtain a TPU foam leather for a racket handle with a sweat-absorbing function.

[0017] The preparation method of the TPU foamed leather with sweat absorption function for the racket handle of the present invention is simple in process and easy to control in operation, which is conducive to large-scale industrial production. The prepared TPU foamed leather has stable quality, excellent moisture absorption and quick-drying performance and dry and wet aging performance, and has the characteristics of good elongation and strong tensile performance. It also has the characteristics of still having a good static friction coefficient after absorbing water, and has excellent comprehensive performance.

[0018] The beneficial effects of the present invention are as follows: the TPU foam leather for the racket handle of the present invention and having a sweat absorption function has excellent moisture absorption and quick-drying performance and wet and dry aging performance, and has the characteristics of good elongation and strong tensile performance, and still has a good static friction coefficient after absorbing water, that is, the TPU foam still has good friction performance after absorbing water, and can well absorb the sweat of the hands of athletes due to sports, and still has a good anti-slip effect after absorbing water, providing users with a good grip feeling and control.

[0019] At the same time, the preparation method of TPU foam leather with sweat absorption function for racket handle is simple in process and easy to control in operation, which is conducive to large-scale industrial production. The prepared TPU foam leather with sweat absorption function for racket handle has stable quality, excellent moisture absorption and quick-drying performance and dry and wet aging performance, and has the characteristics of good elongation and strong tensile performance, and still has the characteristics of good static friction coefficient after absorbing water, and has excellent comprehensive performance. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments, and the contents mentioned in the implementation modes are not intended to limit the present invention.

[0021] Example 1

[0022] In this embodiment, the TPU foam leather used for the racket handle and having the sweat-absorbing function comprises a release paper and a TPU foam film arranged on the upper end surface of the release paper.

[0023] Furthermore, the thickness of the TPU foam film is 0.2-0.5 mm, and the density of the TPU foam film is 0.28-0.3 g / cm 3Preferably, the thickness of the TPU foam film is 0.4 mm, and the density of the TPU foam film is 0.3 g / cm 3 .

[0024] Furthermore, the TPU foam film includes the following raw materials in parts by weight: 80 parts of polyester TPU powder, 40 parts of ABS resin, 7 parts of polyurethane acrylate, 8 parts of sorbic acid, 4 parts of zinc oxide / silicon dioxide composite material, 0.8 parts of stearic acid, 1.2 parts of foaming agent, 1.5 parts of vulcanizing agent and 1 part of antioxidant.

[0025] In this embodiment, the mass fraction of butadiene in the ABS resin is 15-20%, the mass fraction of styrene is 15-25%, and the mass fraction of acrylonitrile is 25-30%.

[0026] In this embodiment, the antioxidant is 2-mercaptobenzimidazole, the vulcanizing agent is diisopropylbenzene peroxide, and the foaming agent is bicarbonate.

[0027] In this embodiment, the polyester TPU powder is TPU of model DP9370A produced by Bayer, Germany. The polyurethane acrylate is polyurethane acrylate PU610.

[0028] Furthermore, the preparation method of each zinc oxide / silicon dioxide composite material comprises the following steps:

[0029] (1) At room temperature, 14.2 g of sodium silicate nonahydrate was added to 20 g of deionized water, stirred evenly and dissolved, and then 10 g of zinc oxide particles was added. Then, 3 mol / L hydrochloric acid was added dropwise until the solution began to gel. Then, the addition of hydrochloric acid solution was stopped to obtain zinc oxide / silicon dioxide gel.

[0030] (2) 20 mL of acetone solution and 20 mL of anhydrous ethanol were added to the zinc oxide / silicon dioxide gel, and the mixture was soaked for 124 h and then placed in an oven at 80°C for 4 h. The oven temperature was then set to 120°C and dried for 2 h. The mixture was finally ground into powder to obtain a zinc oxide / silicon dioxide composite material.

[0031] Furthermore, a method for preparing TPU foam leather for a racket handle having a sweat-absorbing function comprises the following steps:

[0032] (1) Pour polyester TPU powder, ABS resin, polyurethane acrylate, stearic acid, zinc oxide / silicon dioxide composite material, sorbic acid and antioxidant into a container according to weight parts, mix and stir evenly, and then place in a vacuum oven at 120° C. for 20 minutes to obtain a mixture A;

[0033] (2) adding a blowing agent and a vulcanizing agent to the mixture A and stirring evenly to obtain a mixture B;

[0034] (3) Mixture B is then fed into a hopper of a casting machine, and heated at 180° C. by the casting machine to obtain a TPU molten mixture, which is then pushed by a rotating screw, extruded from a die head of the casting machine, and cast onto the upper end of a release paper, so that a TPU foam film is attached to the release paper. The TPU foam film is pressed and cooled by a pressure roller to obtain a TPU foam leather for a racket handle having a sweat-absorbing function.

[0035] Example 2

[0036] In this embodiment, the TPU foam film includes the following raw materials in parts by weight: 100 parts of polyester TPU powder, 50 parts of ABS resin, 10 parts of polyurethane acrylate, 13 parts of sorbic acid, 6 parts of zinc oxide / silicon dioxide composite material, 1 part of stearic acid, 1.8 parts of foaming agent, 2.2 parts of vulcanizing agent and 1.2 parts of antioxidant.

[0037] Furthermore, a method for preparing TPU foam leather for a racket handle having a sweat-absorbing function comprises the following steps:

[0038] (1) Pour polyester TPU powder, ABS resin, polyurethane acrylate, stearic acid, zinc oxide / silicon dioxide composite material, sorbic acid and antioxidant into a container according to weight parts, mix and stir evenly, and then place in a vacuum oven at 120° C. for 30 minutes to obtain a mixture A;

[0039] (2) adding a blowing agent and a vulcanizing agent to the mixture A and stirring evenly to obtain a mixture B;

[0040] (3) Mixture B is then fed into a hopper of a casting machine, and heated at 180° C. by the casting machine to obtain a TPU molten mixture, which is then pushed by a rotating screw, extruded from a die head of the casting machine, and cast onto the upper end of a release paper, so that a TPU foam film is attached to the release paper. The TPU foam film is pressed and cooled by a pressure roller to obtain a TPU foam leather for a racket handle having a sweat-absorbing function.

[0041] The rest of the content of this embodiment is the same as that of Embodiment 1.

[0042] Example 3

[0043] In this embodiment, the TPU foam film includes the following raw materials in parts by weight: 120 parts of polyester TPU powder, 60 parts of ABS resin, 14 parts of polyurethane acrylate, 18 parts of sorbic acid, 8 parts of zinc oxide / silicon dioxide composite material, 1.2 parts of stearic acid, 2.2 parts of foaming agent, 2.8 parts of vulcanizing agent and 1.5 parts of antioxidant.

[0044] Furthermore, a method for preparing TPU foam leather for a racket handle having a sweat-absorbing function comprises the following steps:

[0045] (1) Pour polyester TPU powder, ABS resin, polyurethane acrylate, stearic acid, zinc oxide / silicon dioxide composite material, sorbic acid and antioxidant into a container according to weight parts, mix and stir evenly, and then place in a vacuum oven at 120° C. for 30 minutes to obtain a mixture A;

[0046] (2) adding a blowing agent and a vulcanizing agent to the mixture A and stirring evenly to obtain a mixture B;

[0047] (3) Mixture B is then fed into a hopper of a casting machine, and heated at 180° C. by the casting machine to obtain a TPU molten mixture, which is then pushed by a rotating screw, extruded from a die head of the casting machine, and cast onto the upper end of a release paper, so that a TPU foam film is attached to the release paper. The TPU foam film is pressed and cooled by a pressure roller to obtain a TPU foam leather for a racket handle having a sweat-absorbing function.

[0048] The rest of the content of this embodiment is the same as that of Embodiment 1.

[0049] Comparative Example 1

[0050] This comparative example is different from Example 2 in that an equal amount of polyester TPU powder is used to replace ABS resin.

[0051] That is, in this comparative example, the TPU foam film includes the following raw materials in parts by weight: 150 parts of polyester TPU powder, 10 parts of polyurethane acrylate, 13 parts of sorbic acid, 6 parts of zinc oxide / silicon dioxide composite material, 1 part of stearic acid, 1.8 parts of foaming agent, 2.2 parts of vulcanizing agent and 1.2 parts of antioxidant.

[0052] Furthermore, a method for preparing TPU foam leather for a racket handle having a sweat-absorbing function comprises the following steps:

[0053] (1) Pour polyester TPU powder, polyurethane acrylate, stearic acid, zinc oxide / silicon dioxide composite material, sorbic acid and antioxidant into a container according to parts by weight, mix and stir evenly, and then place in a vacuum oven at 120° C. for 30 minutes to obtain a mixture C;

[0054] (2) adding a blowing agent and a vulcanizing agent to the mixture C and stirring evenly to obtain a mixture D;

[0055] (3) The mixture D is then sent to the hopper of a casting machine, and is heated at 180° C. by the casting machine to obtain a TPU molten mixture, which is then pushed by a rotating screw, extruded from the die head of the casting machine, and cast onto the upper end of the release paper, so that a TPU foam film is attached to the release paper. The TPU foam film is pressed and cooled by a pressure roller to obtain a TPU foam leather for a racket handle with a sweat-absorbing function.

[0056] Comparative Example 2

[0057] The difference between this comparative example and Example 3 is that an equal amount of zinc oxide / silicon dioxide mixture is used instead of the zinc oxide / silicon dioxide composite material. In each zinc oxide / silicon dioxide mixture, 3 g of silicon dioxide particles are added to 10 g of zinc oxide particles, stirred evenly and ground into powder.

[0058] That is, in this comparative example, the TPU foam film includes the following raw materials in parts by weight: 120 parts of polyester TPU powder, 60 parts of ABS resin, 14 parts of polyurethane acrylate, 18 parts of sorbic acid, 8 parts of zinc oxide / silicon dioxide mixture, 1.2 parts of stearic acid, 2.2 parts of foaming agent, 2.8 parts of vulcanizing agent and 1.5 parts of antioxidant.

[0059] Furthermore, a method for preparing TPU foam leather for a racket handle having a sweat-absorbing function comprises the following steps:

[0060] (1) Pour polyester TPU powder, ABS resin, polyurethane acrylate, stearic acid, zinc oxide / silicon dioxide mixture, sorbic acid and antioxidant into a container according to weight parts, mix and stir evenly, and then place in a vacuum oven at 120° C. for 30 minutes to obtain a mixture E;

[0061] (2) adding the blowing agent and the vulcanizing agent to the mixture E and stirring evenly to obtain a mixture F;

[0062] (3) The mixture F is then fed into a hopper of a casting machine, and heated at 180° C. by the casting machine to obtain a TPU molten mixture, which is then pushed by a rotating screw, extruded from a die head of the casting machine, and cast onto the upper end of a release paper, so that a TPU foam film is attached to the release paper. The TPU foam film is pressed and cooled by a pressure roller to obtain a TPU foam leather for a racket handle having a sweat-absorbing function.

[0063] Performance testing

[0064] The performance tests were conducted on the TPU foam leathers for racket handles and having a sweat-absorbing function obtained in Examples 1-3 and Comparative Examples 1-2. The moisture absorption and quick-drying performance, static friction coefficient after water absorption, dry and wet aging performance, tensile strength and elongation of the TPU foam leathers for racket handles and having a sweat-absorbing function were tested. The test data are shown in Table 1 below:

[0065] Table 1

[0066]

[0067]

[0068] Among them, the moisture absorption and quick-drying performance test adopts the standard GB / T 21655.1-2023 "Evaluation of moisture absorption and quick-drying properties of textiles Part 1: Single combination test method".

[0069] Static friction coefficient test: The TPU foam films prepared in Examples 1-3 and Comparative Examples 1-2 were cut into samples of the same size, and the static friction coefficient of the TPU foam film before and after water absorption was tested using a Qmesys friction coefficient tester (QM110CF), and the static friction coefficient when sliding was measured after stainless steel was brought into contact with one side of the TPU foam film according to ASTM D1894. Among them, water absorption treatment of the TPU foam film: Under room temperature, the prepared TPU foam film was completely immersed in 500 mL of deionized water for 4 hours, then placed in a mesh basket and filtered until no water drops were dropped, and then the moisture on the surface of the TPU foam film was wiped off with absorbent paper to obtain the TPU foam film after water absorption.

[0070] Dry and wet aging performance test: (1) Cut the TPU foam films prepared in Examples 1-3 and Comparative Examples 1-2 into samples of the same size, and record their initial masses. (2) Place the samples in a wet heat test chamber, set the temperature to 60°C and the humidity to 85% RH. (3) Perform continuous wet heat exposure under the set dry and wet cycle conditions, with each cycle including 12 hours of wet heat exposure and 12 hours of drying. (4) Take out the samples for mass measurement after each cycle, and continue the dry and wet cycle until the mass of the samples decreases by 10%.

[0071] Tensile strength and elongation at break test: According to ASTM D638 V-type standard, the biodegradable polyester sheets prepared in the examples or comparative examples were cut into test pieces and tested at a tensile speed of 100 mm / min using a universal testing machine (model 4206-001) from INSTRON. The tensile strength (kgf / mm 2 =

[0072] 9.8Mpa) and elongation at break (%).

[0073] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. TPU foam leather for racket handle with sweat absorption function, characterized by: It comprises a release paper and a TPU foam film arranged on the upper end surface of the release paper.

2. The TPU foam leather with sweat-absorbing function for a racket handle according to claim 1, characterized in that: The thickness of the TPU foam film is 0.2-0.5 mm.

3. The TPU foam leather with sweat-absorbing function for a racket handle according to claim 1, characterized in that: The density of the TPU foam film is 0.28-0.3 g / cm 3 .

4. The TPU foam leather with sweat-absorbing function for a racket handle according to claim 1, characterized in that: The TPU foam film comprises the following raw materials in parts by weight: 80-120 parts of polyester TPU powder, 40-60 parts of ABS resin, 7-14 parts of polyurethane acrylate, 8-18 parts of sorbic acid, 4-8 parts of zinc oxide / silicon dioxide composite material, 0.8-1.2 parts of stearic acid, 1-3 parts of foaming agent, 1-3 parts of vulcanizing agent and 1-2 parts of antioxidant.

5. The TPU foam leather with sweat-absorbing function for a racket handle according to claim 1, characterized in that: The preparation method of each zinc oxide / silicon dioxide composite material comprises the following steps: (1) At room temperature, 13-15 g of sodium silicate nonahydrate is added to 18-22 g of deionized water, stirred evenly and fully dissolved, and then 8-12 g of zinc oxide particles are added, followed by dropwise addition of 2.5-3.5 mol / L hydrochloric acid until the solution begins to gel, and then the addition of hydrochloric acid solution is stopped to obtain zinc oxide / silicon dioxide gel. (2) 18-22 mL of acetone solution and 18-22 mL of anhydrous ethanol were added to the zinc oxide / silicon dioxide gel, and the mixture was soaked for 10-14 hours and then placed in an oven at 75-85° C. for drying for 3-5 hours. The oven temperature was then set to 115-125° C. for drying for 1.5-2.5 hours, and finally ground into powder to obtain a zinc oxide / silicon dioxide composite material.

6. The TPU foam leather with sweat absorption function for a racket handle according to claim 4, characterized in that: The mass fraction of butadiene in the ABS resin is 15-20%, the mass fraction of styrene is 15-25%, and the mass fraction of acrylonitrile is 25-30%.

7. The TPU foam leather with sweat-absorbing function for a racket handle according to claim 4, characterized in that: The antioxidant is 2-mercaptobenzimidazole.

8. The TPU foam leather with sweat-absorbing function for a racket handle according to claim 4, characterized in that: The vulcanizing agent is dicumyl peroxide.

9. The TPU foam leather with sweat-absorbing function for a racket handle according to claim 4, characterized in that: The foaming agent is bicarbonate.

10. A method for preparing the TPU foam leather for a racket handle having a sweat-absorbing function as claimed in any one of claims 1 to 9, characterized in that: The steps include: (1) Pour polyester TPU powder, ABS resin, polyurethane acrylate, stearic acid, zinc oxide / silicon dioxide composite material, sorbic acid and antioxidant into a container according to weight parts, mix and stir evenly, and then place in a vacuum oven at 115-125° C. for 20-40 minutes to obtain a mixture A; (2) at room temperature, adding a blowing agent and a vulcanizing agent to the mixture A and stirring evenly to obtain a mixture B; (3) The mixture B is fed into the hopper of a casting machine, and is heated at 175-210° C. by the casting machine to obtain a TPU molten mixture, which is then pushed by a rotating screw, extruded from the die head of the casting machine, and cast onto the upper end of the release paper, so that a TPU foam film is attached to the release paper. The TPU foam film is pressed and cooled by a pressure roller to obtain a TPU foam leather for a racket handle with a sweat-absorbing function.

Images