High-performance leather middle-layer silica gel

Abstract

The invention relates to the technical field of liquid silica gel, in particular to high-performance leather middle-layer silica gel which comprises the following materials in parts by weight: 80-100 parts of base gel; 10 to 50 parts of vinyl silicone resin; 5-15 parts of hydrogen-containing silicone oil; 0-15 parts of vinyl silicone oil; 0.03 to 0.1 part of an inhibitor; and 0.1-0.3 part of a platinum catalyst. The leather middle-layer silica gel prepared by the invention is outstanding in mechanical property, the tearing strength reaches 35N / mm or above, and the leather middle-layer silica gel is suitable for various types of applied silica gel leather; the thickness of the coating is 50-200 [mu] m, and no cracking phenomenon occurs. And in a wear resistance test, a Martindale test shows that the wear resistance times can reach more than 70,000 times, so that the service life of the silica gel leather is greatly prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of liquid silicone, in particular to a high-performance leather middle-layer silicone. Background Art

[0002] Currently, most automotive leathers are made of genuine leather and PU leather. This type of leather will continuously release volatile substances during use, has a certain odor, has poor stain resistance, and is easy to burn.

[0003] Therefore, as a new type of leather composite material, silicone leather has the characteristics of good mechanical properties, environmental protection and non-toxicity, good stain resistance, aging resistance, good feel, and is suitable for some outdoor products. It also has certain flame retardancy and can be self-extinguishing, which is suitable for the field of new energy vehicles.

[0004] However, conventional silicone coatings have the following shortcomings: 1. The mechanical properties are average, and the tear strength is low, generally below 15N / mm, and it is easy to crack when used in electronic packaging; 2. The wear resistance is average, and the Martindale test is basically around 20,000 times. It is only suitable for some fast-moving consumer goods and cannot meet the wear resistance requirements in the fields of home sofas, car seats, etc. Summary of the invention

[0005] In view of the problems of the prior art, the present invention provides a high-performance leather middle-layer silica gel with excellent mechanical properties and wear resistance.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a high-performance leather middle-layer silica gel, comprising the following materials in parts by weight:

[0008]

[0009]

[0010] Furthermore, the base glue comprises the following materials in parts by weight:

[0011]

[0012] Furthermore, the white carbon black is HS-380 white carbon black, which is prepared by a gas phase method, and the specific surface area of ​​the white carbon black is 200-400m 2 / g.

[0013] Furthermore, the preparation method of the base glue comprises the following steps:

[0014] S1. Put vinyl silicone oil, hexamethyldisilazane, dimethylvinylethoxysilane and water into a kneader and stir for 4-6 minutes; wherein the total amount of vinyl silicone oil is 40-50% by weight;

[0015] S2. Put the white carbon black into the kneading machine several times, and control the kneading machine for kneading for 20-30min each time the white carbon black is put into the kneading machine;

[0016] S3. Knead the material in the kneader for another 3.5-4.5h;

[0017] S4. The temperature in the kneader is raised to 140-160°C, and then the kneader is evacuated and maintained for 1.2-2.5h;

[0018] S5. The remaining vinyl silicone oil is added to the kneader several times, and the kneader is controlled to knead for 20-30min after each kneading of the vinyl silicone oil;

[0019] S6. Knead the material in the kneader for another 25-40 minutes to obtain the base rubber.

[0020] Furthermore, step S2 is performed four times, and the weight of the white carbon black added in the four times of step S2 accounts for 25-35%, 25-35%, 15-25%, and 15-25% of the total weight of the white carbon black, respectively;

[0021] Step S5 is executed three times, and the weight of the vinyl silicone oil added in the three executions of step S5 accounts for 8-12%, 13-18%, and 28-33% of the total weight of the vinyl silicone oil, respectively.

[0022] Furthermore, the inhibitor is one or more of ethynylcyclohexanol and methylbutynol.

[0023] Furthermore, the viscosity of the vinyl silicone resin is 50,000-100,000, and the vinyl content in the vinyl silicone resin is 1-1.5%.

[0024] Furthermore, the method further comprises the following steps:

[0025] A. Add base glue, vinyl silicone resin, hydrogenated silicone oil, inhibitor and platinum catalyst into the planetary mixer;

[0026] B. Evacuate the planetary mixer and stir for 8-12 minutes in a vacuum environment;

[0027] C. Break the vacuum in the planetary mixer, and then continue stirring for 15-25 minutes in a vacuum environment.

[0028] Furthermore, it also includes:

[0029] D. Take samples from the planetary mixer and then test the samples; if the test results are all qualified, proceed to step E, otherwise proceed to step F;

[0030] E. Taking out the materials in the planetary mixer and filtering them to obtain high-performance leather middle-layer silica gel;

[0031] F. Adjust the performance by adding silicone oil, continue stirring for 15-25 minutes, and then perform step D again;

[0032] The tests include viscosity test, hardness test, tensile strength test and Martindale wear test.

[0033] Furthermore, in step C, after breaking the vacuum in the planetary mixer, the inner wall of the planetary mixer and the materials attached to the stirring paddle are cleaned into the planetary mixer, and then stirring is continued for 15-25 minutes.

[0034] Beneficial effects of the present invention: The leather middle layer silicone obtained by the present invention has outstanding mechanical properties, and the tear strength reaches more than 35N / mm, which is suitable for various silicone leather applications; the coating thickness is 50-200um, and there will be no cracking phenomenon. In the wear resistance test, the Martindale test shows that the wear resistance can reach more than 70,000 times, which greatly improves the service life of the silicone leather. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with the embodiments, and the contents mentioned in the embodiments are not intended to limit the present invention.

[0036] The present invention provides a high-performance leather middle-layer silica gel, comprising the following materials in parts by weight:

[0037]

[0038]

[0039] Furthermore, the base glue comprises the following materials in parts by weight:

[0040]

[0041] In this embodiment, the white carbon black is HS-380 white carbon black, which is prepared by a gas phase method and has a specific surface area of ​​200-400 m 2 / g.

[0042] In this embodiment, the vinyl silicone oil is 100,000 vinyl silicone oil.

[0043] In this embodiment, the inhibitor is one or more of ethynylcyclohexanol and methylbutynol.

[0044] In this embodiment, the viscosity of the vinyl silicone resin is 50,000-100,000, and the vinyl content in the vinyl silicone resin is 1-1.5%.

[0045] The leather middle layer silicone of the present invention has outstanding mechanical properties, and the tear strength reaches more than 35N / mm, which is suitable for various silicone leather applications; the coating thickness is 50-200um, and there will be no cracking phenomenon. In the wear resistance test, the Martindale test shows that the wear resistance can reach more than 70,000 times, which greatly improves the service life of the silicone leather.

[0046] In this embodiment, the preparation method of the base glue comprises the following steps:

[0047] S1. Put vinyl silicone oil, hexamethyldisilazane, dimethylvinylethoxysilane and water into a kneader and stir for 4-6 minutes; wherein the total amount of vinyl silicone oil is 40-50% by weight;

[0048] S2. Put the white carbon black into the kneading machine several times, and control the kneading machine for kneading for 20-30min each time the white carbon black is put into the kneading machine;

[0049] S3. Knead the material in the kneader for another 3.5-4.5h;

[0050] S4. The temperature in the kneader is raised to 140-160°C, and then the kneader is evacuated and maintained for 1.2-2.5h;

[0051] S5. The remaining vinyl silicone oil is added to the kneader several times, and the kneader is controlled to knead for 20-30min after each kneading of the vinyl silicone oil;

[0052] S6. Knead the material in the kneader for another 25-40 minutes to obtain the base rubber.

[0053] Specifically, step S2 is performed four times, and the weight of the white carbon black added in the four times of step S2 accounts for 25-35%, 25-35%, 15-25%, and 15-25% of the total weight of the white carbon black, respectively.

[0054] For example, step S2 is executed four times, as follows:

[0055] The weight of the added white carbon black accounts for 30% of the total weight. After adding the white carbon black, the kneading machine is controlled to knead for 20-30 minutes;

[0056] After the first kneading is completed, the second feeding is carried out: the weight of the added white carbon black accounts for 30% of the total weight, and the kneading machine is controlled to knead for 20-30 minutes after the white carbon black is added;

[0057] After the second kneading is completed, the third feeding is carried out: the weight of the added white carbon black accounts for 20% of the total weight, and after the addition of the white carbon black, the kneading machine is controlled to knead for 20-30 minutes;

[0058] After the third kneading is completed, the fourth feeding is carried out: the weight of the added white carbon black accounts for 20% of the total weight, and after the addition of the white carbon black, the kneading machine is controlled to knead for 20-30 minutes;

[0059] After the fourth kneading is completed, knead for another 3.5-4.5 hours.

[0060] Similarly, step S5 is executed three times, and the weight of the vinyl silicone oil added in the three executions of step S5 accounts for 8-12%, 13-18%, and 28-33% of the total weight of the vinyl silicone oil, respectively.

[0061] For example, the weight of the vinyl silicone oil added for the first time accounts for 10% of the total weight, and then the kneading machine is controlled to knead for 20-30 minutes;

[0062] After the first kneading is completed, the second feeding is carried out: the weight of the vinyl silicone oil added accounts for 15% of the total weight, and then the kneading machine is controlled to knead for 20-30 minutes;

[0063] After the second kneading is completed, the third feeding is carried out: the weight of the vinyl silicone oil added accounts for 30% of the total weight, and then the kneading machine is controlled to knead for 20-30 minutes;

[0064] After the third kneading is completed, the kneading machine is controlled to continue kneading for 30 minutes to complete the entire step S5.

[0065] Thus, the sum of the weights of the vinyl silicone oil added three times in step S5 is exactly 55% of the total weight of the vinyl silicone oil, plus the weight of the vinyl silicone oil added in step S1, which is 45% of the total weight, is exactly 100%.

[0066] In addition, during the kneading process, since it involves the judgment of the kneaded mixture, for example, in step S2, each 20-30 minutes of kneading is judged based on whether the mixture is clumped and has a smooth surface. For example, when the mixture is observed to be clumped and has a smooth surface after kneading for 23 minutes, the next feeding can be carried out.

[0067] The state of the mixture is acquired by the camera, and the controller analyzes the image by itself after combining deep learning to make a judgment. That is, the controller analyzes the image to observe whether it is completely mixed and has no particles on the surface. The controller analyzes the image, which has the following advantages over manual analysis:

[0068] 1. No need to stop the kneading machine and open it for judgment and observation;

[0069] Second, the controller analyzes images more finely and with higher accuracy than human eye observation.

[0070] In addition to the heating module, the kneading machine also has a cooling module. The heating module has the effect of heating the cavity of the kneading machine to about 150°C, while the cooling module is used to cool the mixture if it heats up during the kneading process to ensure that the mixture is kneaded and formed at a predetermined temperature, thereby avoiding excessive temperature that affects performance.

[0071] In this embodiment, the high-performance leather middle-layer silica gel of the present invention is mainly prepared by the following steps:

[0072] A. Add base glue, vinyl silicone resin, hydrogenated silicone oil, inhibitor and platinum catalyst into the planetary mixer;

[0073] B. Evacuate the planetary mixer and stir for 8-12 minutes in a vacuum environment;

[0074] C. Break the vacuum in the planetary mixer, and then continue stirring for 15-25 minutes in a vacuum environment.

[0075] That is, in the preparation of high-performance leather middle layer silicone, the mixing method adopted is stirring, using a planetary mixer to stir various raw materials under vacuum to fully mix them into a mass, and then breaking the vacuum to continue stirring, thereby forming a coating of high-performance leather middle layer silicone.

[0076] After the above step C, the method further includes:

[0077] D. Take samples from the planetary mixer and then test the samples; if the test results are all qualified, proceed to step E, otherwise proceed to step F;

[0078] E. Taking out the materials in the planetary mixer and filtering them to obtain high-performance leather middle-layer silica gel;

[0079] F. Adjust the performance by adding silicone oil, continue stirring for 15-25 minutes, and then perform step D again;

[0080] Specifically, the tests include a viscosity test, a hardness test, a tensile strength test, and a Martindale abrasion test.

[0081] That is, after the stirring is completed, the obtained material needs to undergo a variety of tests to determine whether the mechanical properties and wear resistance meet the standards before subsequent filtration can be carried out. The high-performance leather middle-layer silicone obtained by filtration can achieve the required performance by coating it on the base glue, so that it can be used in new energy vehicle seats, home sofas and other products with strong competitiveness.

[0082] That is, when stirring in a vacuum environment, since the prepared material has a certain viscosity, a large number of bubbles are generated during the stirring process, and the material expands, so it will stick to the inner wall of the mixing cylinder, stirring paddles and other parts of the planetary mixer.

[0083] Based on the above problems, after executing step B, the following specific steps need to be performed: After breaking the vacuum in the planetary mixer, first clean the inner wall of the planetary mixer and the materials attached to the stirring paddle into the planetary mixer, then evacuate the planetary mixer, and continue stirring under vacuum conditions for 15-25 minutes. This method can not only make the mixing more complete, but also promptly remove the bubbles generated during the stirring process.

[0084] During the mixing process, a camera is used to capture the distribution of the mixture inside the planetary mixer, and the main controller adjusts the parameters according to the amount of mixture adhering to the inner wall of the mixing barrel and the mixing paddle: as the amount of mixture adhering to the inner wall of the mixing barrel increases, the mixing rate can be appropriately increased; and as the amount of mixture adhering to the mixing paddle increases, the power of the mixing paddle needs to be increased to maintain the rate.

[0085] Below, the disclosure and discussion of the embodiments and comparative examples are carried out for the above formulation:

[0086] Example 1

[0087] The high-performance leather middle layer silicone provided in this embodiment includes the following materials in parts by weight: 80 parts of base glue; 20 parts of vinyl silicone resin; 9 parts of hydrogen-containing silicone oil; 5 parts of vinyl silicone oil; 0.05 parts of inhibitor; and 0.1 parts of platinum catalyst.

[0088] The base rubber includes the following materials in parts by weight: 1400 parts of 100,000 vinyl silicone oil; 600 parts of HS-380 white carbon black; 130 parts of hexamethyldisilazane; 30 parts of dimethylvinylethoxysilane; and 45 parts of water.

[0089] The steps of preparing the base glue include:

[0090] S1. Vinyl silicone oil, hexamethyldisilazane, dimethylvinylethoxysilane and water were added to a kneader and stirred for 5 min; wherein the total amount of vinyl silicone oil added accounted for 45% of the total weight;

[0091] S2. The HS-380 white carbon black was added to the kneader four times, and the kneader was controlled to knead for 20-30min each time the white carbon black was added; the weight of the HS-380 white carbon black added each time accounted for the total weight of the HS-380 white carbon black, respectively, 30%, 30%, 20%, and 20%;

[0092] S3. Knead the material in the kneader for another 4h;

[0093] S4. The temperature in the kneader was raised to 150°C, and then the kneader was evacuated and maintained for 2h;

[0094] S5. The remaining vinyl silicone oil was added to the kneader three times, and the kneader was controlled to knead for 20-30min after each addition of the vinyl silicone oil; wherein the weight of each addition of the vinyl silicone oil accounted for 10%, 15%, and 30% of the total weight of the vinyl silicone oil;

[0095] S6. Knead the material in the kneader for another 30 minutes to obtain the base rubber.

[0096] The preparation method of high-performance leather middle layer silicone is as follows:

[0097] A. Add base glue, vinyl silicone resin, hydrogenated silicone oil, inhibitor and platinum catalyst into a planetary mixer;

[0098] B. Evacuate the planetary mixer and stir for 8-12 minutes in a vacuum environment;

[0099] C. Break the vacuum inside the planetary mixer, shovel off the mixture stuck on the inner wall of the planetary mixer and the stirring paddle, and then continue stirring for 15-25 minutes under vacuum.

[0100] D. Take samples from the planetary mixer and then test the samples; if the test results are all qualified, proceed to step E, otherwise proceed to step F;

[0101] E. Taking out the materials in the planetary mixer and filtering them to obtain high-performance leather middle-layer silica gel;

[0102] F. Adjust the performance by adding silicone oil, continue stirring for 15-25 minutes, and then perform step D again;

[0103] Example 2

[0104] The high-performance leather middle layer silicone provided in this embodiment includes the following materials in parts by weight: 90 parts of base glue; 10 parts of vinyl silicone resin; 7 parts of hydrogen-containing silicone oil; 15 parts of vinyl silicone oil; 0.06 parts of inhibitor; and 0.2 parts of platinum catalyst.

[0105] The base rubber includes the following materials in parts by weight: 1600 parts of 100,000 vinyl silicone oil; 700 parts of HS-380 white carbon black; 175 parts of hexamethyldisilazane; 30 parts of dimethylvinylethoxysilane; and 60 parts of water.

[0106] The steps of preparing the base glue include:

[0107] S1. Vinyl silicone oil, hexamethyldisilazane, dimethylvinylethoxysilane and water were added to a kneader and stirred for 5 min; wherein the total amount of vinyl silicone oil added accounted for 45% of the total weight;

[0108] S2. The HS-380 white carbon black was added to the kneader four times, and the kneader was controlled to knead for 20-30min each time the white carbon black was added; the weight of the HS-380 white carbon black added each time accounted for the total weight of the HS-380 white carbon black, respectively, 30%, 30%, 20%, and 20%;

[0109] S3. Knead the material in the kneader for another 4h;

[0110] S4. The temperature in the kneader was raised to 150°C, and then the kneader was evacuated and maintained for 2h;

[0111] S5. The remaining vinyl silicone oil was added to the kneader three times, and the kneader was controlled to knead for 20-30min after each addition of the vinyl silicone oil; wherein the weight of each addition of the vinyl silicone oil accounted for 10%, 15%, and 30% of the total weight of the vinyl silicone oil;

[0112] S6. Knead the material in the kneader for another 30 minutes to obtain the base rubber.

[0113] The preparation method of high-performance leather middle layer silicone is as follows:

[0114] A. Add base glue, vinyl silicone resin, hydrogenated silicone oil, inhibitor and platinum catalyst into the planetary mixer;

[0115] B. Evacuate the planetary mixer and stir for 8-12 minutes in a vacuum environment;

[0116] C. Break the vacuum inside the planetary mixer, shovel off the mixture stuck on the inner wall of the planetary mixer and the stirring paddle, and then continue stirring for 15-25 minutes under vacuum.

[0117] D. Take samples from the planetary mixer and then test the samples; if the test results are all qualified, proceed to step E, otherwise proceed to step F;

[0118] E. Taking out the materials in the planetary mixer and filtering them to obtain high-performance leather middle-layer silica gel;

[0119] F. Adjust the performance by adding silicone oil, continue stirring for 15-25 minutes, and then perform step D again;

[0120] Example 3

[0121] The high-performance leather middle layer silicone provided in this embodiment includes the following materials in parts by weight: 80 parts of base glue; 30 parts of vinyl silicone resin; 11 parts of hydrogen-containing silicone oil; 7 parts of vinyl silicone oil; 0.06 parts of inhibitor; and 0.3 parts of platinum catalyst.

[0122] The base rubber includes the following materials in parts by weight: 1,400 parts of 100,000 vinyl silicone oil; 700 parts of HS-380 white carbon black; 180 parts of hexamethyldisilazane; 25 parts of dimethylvinylethoxysilane; and 53 parts of water.

[0123] The steps of preparing the base glue include:

[0124] S1. Vinyl silicone oil, hexamethyldisilazane, dimethylvinylethoxysilane and water were added to a kneader and stirred for 5 min; wherein the total amount of vinyl silicone oil added accounted for 45% of the total weight;

[0125] S2. The HS-380 white carbon black was added to the kneader four times, and the kneader was controlled to knead for 20-30min each time the white carbon black was added; the weight of the HS-380 white carbon black added each time accounted for the total weight of the HS-380 white carbon black, respectively, 30%, 30%, 20%, and 20%;

[0126] S3. Knead the material in the kneader for another 4h;

[0127] S4. The temperature in the kneader was raised to 150°C, and then the kneader was evacuated and maintained for 2h;

[0128] S5. The remaining vinyl silicone oil was added to the kneader three times, and the kneader was controlled to knead for 20-30min after each addition of the vinyl silicone oil; wherein the weight of each addition of the vinyl silicone oil accounted for 10%, 15%, and 30% of the total weight of the vinyl silicone oil;

[0129] S6. Knead the material in the kneader for another 30 minutes to obtain the base rubber.

[0130] The preparation method of high-performance leather middle layer silicone is as follows:

[0131] A. Add base glue, vinyl silicone resin, hydrogenated silicone oil, inhibitor and platinum catalyst into the planetary mixer;

[0132] B. Evacuate the planetary mixer and stir for 8-12 minutes in a vacuum environment;

[0133] C. Break the vacuum inside the planetary mixer, shovel off the mixture stuck on the inner wall of the planetary mixer and the stirring paddle, and then continue stirring for 15-25 minutes under vacuum.

[0134] D. Take samples from the planetary mixer and then test the samples; if the test results are all qualified, proceed to step E, otherwise proceed to step F;

[0135] E. Taking out the materials in the planetary mixer and filtering them to obtain high-performance leather middle-layer silica gel;

[0136] F. Adjust the performance by adding silicone oil, continue stirring for 15-25 minutes, and then perform step D again;

[0137] Example 4

[0138] The high-performance leather middle layer silicone provided in this embodiment includes the following materials in parts by weight: 80 parts of base glue; 50 parts of vinyl silicone resin; 13 parts of hydrogen-containing silicone oil; 0.07 parts of inhibitor; and 0.2 parts of platinum catalyst.

[0139] The base rubber includes the following materials in parts by weight: 1500 parts of 100,000 vinyl silicone oil; 700 parts of HS-380 white carbon black; 180 parts of hexamethyldisilazane; 25 parts of dimethylvinylethoxysilane; and 53 parts of water.

[0140] The steps of preparing the base glue include:

[0141] S1. Vinyl silicone oil, hexamethyldisilazane, dimethylvinylethoxysilane and water were added to a kneader and stirred for 5 min; wherein the total amount of vinyl silicone oil added accounted for 45% of the total weight;

[0142] S2. The HS-380 white carbon black was added to the kneader four times, and the kneader was controlled to knead for 20-30min each time the white carbon black was added; the weight of the HS-380 white carbon black added each time accounted for the total weight of the HS-380 white carbon black, respectively, 30%, 30%, 20%, and 20%;

[0143] S3. Knead the material in the kneader for another 4h;

[0144] S4. The temperature in the kneader was raised to 150°C, and then the kneader was evacuated and maintained for 2h;

[0145] S5. The remaining vinyl silicone oil was added to the kneader three times, and the kneader was controlled to knead for 20-30min after each addition of the vinyl silicone oil; wherein the weight of each addition of the vinyl silicone oil accounted for 10%, 15%, and 30% of the total weight of the vinyl silicone oil;

[0146] S6. Knead the material in the kneader for another 30 minutes to obtain the base rubber.

[0147] The preparation method of high-performance leather middle layer silicone is as follows:

[0148] A. Add base glue, vinyl silicone resin, hydrogenated silicone oil, inhibitor and platinum catalyst into a planetary mixer;

[0149] B. Evacuate the planetary mixer and stir for 8-12 minutes in a vacuum environment;

[0150] C. Break the vacuum inside the planetary mixer, shovel off the mixture stuck on the inner wall of the planetary mixer and the stirring paddle, and then continue stirring for 15-25 minutes under vacuum.

[0151] D. Take samples from the planetary mixer and then test the samples; if the test results are all qualified, proceed to step E, otherwise proceed to step F;

[0152] E. Taking out the materials in the planetary mixer and filtering them to obtain high-performance leather middle-layer silica gel;

[0153] F. Adjust the performance by adding silicone oil, continue stirring for 15-25 minutes, and then perform step D again;

[0154] Comparative Example 1

[0155] The high-performance leather middle layer silicone provided in this embodiment includes the following materials in parts by weight: 80 parts of base glue; 60 parts of vinyl silicone resin; 15 parts of hydrogen-containing silicone oil; 0.06 parts of inhibitor; and 0.2 parts of platinum catalyst.

[0156] The base rubber includes the following materials in parts by weight: 1500 parts of 100,000 vinyl silicone oil; 700 parts of HS-380 white carbon black; 180 parts of hexamethyldisilazane; 15 parts of dimethylvinylethoxysilane; and 50 parts of water.

[0157] The steps of preparing the base glue include:

[0158] S1. Vinyl silicone oil, hexamethyldisilazane, dimethylvinylethoxysilane and water were added to a kneader and stirred for 5 min; wherein the total amount of vinyl silicone oil added accounted for 45% of the total weight;

[0159] S2. The HS-380 white carbon black was added to the kneader four times, and the kneader was controlled to knead for 20-30min each time the white carbon black was added; the weight of the HS-380 white carbon black added each time accounted for the total weight of the HS-380 white carbon black, respectively, 30%, 30%, 20%, and 20%;

[0160] S3. Knead the material in the kneader for another 4h;

[0161] S4. The temperature in the kneader was raised to 150°C, and then the kneader was evacuated and maintained for 2h;

[0162] S5. The remaining vinyl silicone oil was added to the kneader three times, and the kneader was controlled to knead for 20-30min after each addition of the vinyl silicone oil; wherein the weight of each addition of the vinyl silicone oil accounted for 10%, 15%, and 30% of the total weight of the vinyl silicone oil;

[0163] S6. Knead the material in the kneader for another 30 minutes to obtain the base rubber.

[0164] The preparation method of high-performance leather middle layer silicone is as follows:

[0165] A. Add base rubber, hydrogenated silicone oil, inhibitor and platinum catalyst into the planetary mixer;

[0166] B. Evacuate the planetary mixer and stir for 8-12 minutes in a vacuum environment;

[0167] C. Break the vacuum inside the planetary mixer, shovel off the mixture stuck on the inner wall of the planetary mixer and the stirring paddle, and then continue stirring for 15-25 minutes under vacuum.

[0168] D. Take samples from the planetary mixer and then test the samples; if the test results are all qualified, proceed to step E, otherwise proceed to step F;

[0169] E. Taking out the materials in the planetary mixer and filtering them to obtain high-performance leather middle-layer silica gel;

[0170] F. Adjust the performance by adding silicone oil, continue stirring for 15-25 minutes, and then perform step D again;

[0171] Comparative Example 2

[0172] The high-performance leather middle layer silicone provided in this embodiment includes the following materials in parts by weight: 100 parts of base glue; 0 parts of vinyl silicone resin; 5 parts of hydrogen-containing silicone oil; 15 parts of vinyl silicone oil; 0.1 parts of inhibitor; and 0.2 parts of platinum catalyst.

[0173] The base rubber includes the following materials in parts by weight: 1,500 parts of 100,000 vinyl silicone oil; 700 parts of HS-380 white carbon black; 160 parts of hexamethyldisilazane; 40 parts of dimethylvinylethoxysilane; and 40 parts of water.

[0174] The steps of preparing the base glue include:

[0175] S1. Vinyl silicone oil, hexamethyldisilazane, dimethylvinylethoxysilane and water were added to a kneader and stirred for 5 min; wherein the total amount of vinyl silicone oil added accounted for 45% of the total weight;

[0176] S2. The HS-380 white carbon black was added to the kneader four times, and the kneader was controlled to knead for 20-30min each time the white carbon black was added; the weight of the HS-380 white carbon black added each time accounted for the total weight of the HS-380 white carbon black, respectively, 30%, 30%, 20%, and 20%;

[0177] S3. Knead the material in the kneader for another 4h;

[0178] S4. The temperature in the kneader was raised to 150°C, and then the kneader was evacuated and maintained for 2h;

[0179] S5. The remaining vinyl silicone oil was added to the kneader three times, and the kneader was controlled to knead for 20-30min after each addition of the vinyl silicone oil; wherein the weight of each addition of the vinyl silicone oil accounted for 10%, 15%, and 30% of the total weight of the vinyl silicone oil;

[0180] S6. Knead the material in the kneader for another 30 minutes to obtain the base rubber.

[0181] The preparation method of high-performance leather middle layer silicone is as follows:

[0182] A. Add base glue, vinyl silicone resin, inhibitor and platinum catalyst into the planetary mixer;

[0183] B. Evacuate the planetary mixer and stir for 8-12 minutes in a vacuum environment;

[0184] C. Break the vacuum inside the planetary mixer, shovel off the mixture stuck on the inner wall of the planetary mixer and the stirring paddle, and then continue stirring for 15-25 minutes under vacuum.

[0185] D. Take samples from the planetary mixer and then test the samples; if the test results are all qualified, proceed to step E, otherwise proceed to step F;

[0186] E. Taking out the materials in the planetary mixer and filtering them to obtain high-performance leather middle-layer silica gel;

[0187] F. Adjust the performance by adding silicone oil, continue stirring for 15-25 minutes, and then perform step D again;

[0188] The test results of each sample are shown in the following table:

[0189]

[0190]

[0191] In the above test results, the viscosity test was conducted by a rotary viscometer at 25°C; the Martindale wear test was conducted by measuring the weight loss after 70,000 frictions at a test speed of 48 times / min and a load of 585g.

[0192] In comparison group 1, due to the addition of a large amount of vinyl silicone resin, although the wear resistance of the glue is in line with expectations and the hardness is relatively high, the glue is relatively brittle and has a low tear strength, resulting in a short service life and is not conducive to long-term use.

[0193] In the control group 2, since no vinyl silicone resin was added, the hardness was significantly reduced, and obvious wear occurred after the Martindale test. Except for the tensile strength, other parameters did not meet expectations.

[0194] It can be seen from the above test results that the high-performance leather middle layer silicone prepared by the present invention has excellent viscosity, hardness, tensile strength, tear strength and wear resistance. Therefore, it is applied to products such as seats, which can ensure sufficient comfort and experience while also having a long service life.

[0195] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention is disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments according to the technology of the present invention are within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.

Claims

1. A high-performance leather middle layer silica gel, characterized in that: The composition comprises the following materials in parts by weight:

2. The high-performance leather middle layer silica gel according to claim 1, characterized in that: The base glue comprises the following materials in parts by weight:

3. The high-performance leather middle layer silica gel according to claim 2, characterized in that: The white carbon black is HS-380 white carbon black, which is prepared by a gas phase method and has a specific surface area of ​​200-400m 2 / g.

4. The high-performance leather middle layer silica gel according to claim 2, characterized in that: The preparation method of the base glue comprises the following steps: S1. Put vinyl silicone oil, hexamethyldisilazane, dimethylvinylethoxysilane and water into a kneader and stir for 4-6 minutes; wherein the total amount of vinyl silicone oil is 40-50% by weight; S2. Put the white carbon black into the kneading machine several times, and control the kneading machine for kneading for 20-30min each time the white carbon black is put into the kneading machine; S3. Knead the material in the kneader for another 3.5-4.5h; S4. The temperature in the kneader is raised to 140-160°C, and then the kneader is evacuated and maintained for 1.2-2.5h; S5. The remaining vinyl silicone oil is added to the kneader several times, and the kneader is controlled to knead for 20-30min after each kneading of the vinyl silicone oil; S6. Knead the material in the kneader for another 25-40 minutes to obtain the base rubber.

5. The high-performance leather middle layer silica gel according to claim 4, characterized in that: Step S2 is performed four times, and the weight of the white carbon black added in the four times of step S2 accounts for 25-35%, 25-35%, 15-25%, and 15-25% of the total weight of the white carbon black, respectively; Step S5 is executed three times, and the weight of the vinyl silicone oil added in the three executions of step S5 accounts for 8-12%, 13-18%, and 28-33% of the total weight of the vinyl silicone oil, respectively.

6. The high-performance leather middle layer silica gel according to claim 1, characterized in that: The inhibitor is one or more of ethynyl cyclohexanol and methyl butynol.

7. The high-performance leather middle layer silica gel according to claim 1, characterized in that: The viscosity of the vinyl silicone resin is 50,000-100,000, and the vinyl content in the vinyl silicone resin is 1-1.5%.

8. The high-performance leather middle layer silica gel according to claim 1, characterized in that: The following steps are also included: A. Add base glue, vinyl silicone resin, hydrogenated silicone oil, inhibitor and platinum catalyst into the planetary mixer; B. Evacuate the planetary mixer and stir for 8-12 minutes under vacuum; C. Break the vacuum in the planetary mixer, and then continue stirring for 15-25 minutes in a vacuum environment.

9. The high-performance leather middle layer silica gel according to claim 8, characterized in that: Also includes: D. Take samples from the planetary mixer and then test the samples; if the test results are all qualified, proceed to step E, otherwise proceed to step F; E. Taking out the materials in the planetary mixer and filtering them to obtain high-performance leather middle-layer silica gel; F. Adjust the performance by adding silicone oil, continue stirring for 15-25 minutes, and then perform step D again; The tests include viscosity test, hardness test, tensile strength test and Martindale wear test.

10. The high-performance leather middle layer silica gel according to claim 8, characterized in that: In step C, after breaking the vacuum in the planetary mixer, first clean the inner wall of the planetary mixer and the materials attached to the stirring paddle into the planetary mixer, and then continue stirring for 15-25 minutes in a vacuum environment.

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