Silica gel leather dry and smooth hand feeling surface glue and preparation process thereof

Abstract

The invention relates to the technical field of liquid silica gel, in particular to silica gel leather dry and smooth hand feeling surface glue and a preparation process thereof.The silica gel leather dry and smooth hand feeling surface glue is prepared from, by weight, 20-50 parts of base glue, 50-80 parts of vinyl silicone resin, 50-100 parts of diluent, 10-30 parts of hand feeling powder, 8-15 parts of hydrogen-containing silicone oil, 0-15 parts of vinyl silicone oil and 0.07-0.2 part of inhibitor. And 0.3-0.5 part of a platinum catalyst. The preparation process comprises the following steps: A, adding base rubber, vinyl silicone resin and a diluent into a planetary stirrer, and then controlling the planetary stirrer to stir for 10 minutes; wherein 35-70 parts by weight of the diluent is added; b, adding the hand feeling powder into a planetary stirrer, and then controlling the planetary stirrer to stir for 10 minutes; and C, adding the rest diluent into the planetary stirrer, and starting vacuum to continuously stir for 10 minutes.

Description

Technical Field

[0001] The invention relates to the technical field of liquid silicone, in particular to a silicone leather dry and smooth feel surface adhesive and a preparation process thereof. Background Art

[0002] Silicone leather is widely used, and different fields have different requirements for performance, feel, patterns, etc. The feel of silicone leather is mainly provided by the surface adhesive. For some special fields, such as car seats, it is required to have a dry and smooth touch. The feel of ordinary surface adhesive can generally only be used as a packaging material for low-end consumer products and cannot meet the feel requirements of car seats. The existing method of spraying feel oil can meet the feel requirements, but the feel layer will slowly wear off during use, thus losing the dry and smooth feel, resulting in a short service life.

[0003] Therefore, there is an urgent need for a solution for a surface adhesive that can provide a long-lasting dry and slippery feel that can be maintained for more than ten years. Summary of the invention

[0004] In view of the problems of the prior art, the present invention provides a silicone leather dry and smooth feel surface adhesive and a preparation process thereof, which has the advantages of wear resistance and dry feel, and can still maintain a stable feel after being used for several years.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a silicone leather dry and smooth feel surface adhesive, comprising the following materials in parts by weight:

[0007] 20-50 parts of base glue

[0008] Vinyl silicone resin 50-80 parts

[0009]

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

[0011]

[0012] Furthermore, the white carbon black 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 viscosity of the vinyl silicone oil is 50,000-100,000, and the hydrogen content of the hydrogen-containing silicone oil is 0.5-0.75%.

[0014] Furthermore, the hand-feeling powder is prepared by a gas phase method, and the particle size of the hand-feeling powder is 4-6 μm.

[0015] Furthermore, the diluent is an alkane solvent, and the inhibitor is one or both of ethynyl cyclohexanol and methyl butynol.

[0016] The present invention also provides a preparation process of a silicone leather dry and smooth feel surface adhesive, comprising the following steps:

[0017] A. Add the base glue, vinyl silicone resin and diluent into the planetary mixer, and then control the planetary mixer to stir for 9-12 minutes; the amount of diluent added is 60-80% of the total amount of diluent;

[0018] B. Add the hand-feel powder into the planetary mixer, and then control the planetary mixer to mix for 9-12 minutes;

[0019] C. Add vinyl silicone oil, hydrogen silicone oil, inhibitor, platinum catalyst and remaining diluent into the planetary mixer, then turn on the vacuum and continue stirring for 9-12 minutes.

[0020] Furthermore, the preparation method of the base glue is as follows:

[0021] A1. Put vinyl silicone oil, hexamethyldisilazane and water into a kneader and stir for 4-6 minutes; the weight of the vinyl silicone oil added is 40-50% of the total weight of the vinyl silicone oil;

[0022] A2 puts the white carbon black into the kneading machine four times, and controls the kneading machine to knead for 20-30 minutes after each addition of white carbon black;

[0023] A3. Control the kneading machine to knead for 3-5 hours;

[0024] A4. The kneader is heated to 140-160°C, and then vacuumed and maintained for 1.5-2.5h;

[0025] A5. Add the remaining vinyl silicone oil into the kneading machine three times, and knead for 20-30 minutes after each addition of vinyl silicone oil;

[0026] A6.Control the kneading machine to knead for another 20-30 minutes to obtain the base rubber.

[0027] Furthermore, in step A2, the weight of the white carbon black fed into the kneader each time accounts for 25-35%, 25-35%, 15-25%, and 15-25% of the total weight of the white carbon black respectively.

[0028] Furthermore, in step A5, the weight of the vinyl silicone oil added each time accounts for 8-12%, 13-18%, and 26-35% of the total weight of the vinyl silicone oil, respectively.

[0029] Beneficial effects of the present invention: The surface adhesive prepared by the present invention has a smooth feel due to the characteristics of the feel powder, hydrogen-containing silicone oil and vinyl silicone oil, and because the feel characteristics are based on the material itself rather than spraying oil, it will not wear out as the number of touches increases; in addition, based on the amount of base adhesive and vinyl silicone resin used and prepared by multiple stirring and kneading, the wear resistance effect is better. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with examples, and the contents mentioned in the embodiments are not intended to limit the present invention. The present invention is described in detail below.

[0031] The present invention provides a silicone leather dry and smooth feel surface adhesive, comprising the following materials in parts by weight:

[0032]

[0033] Wherein, the base glue comprises the following materials in parts by weight:

[0034]

[0035] The white carbon black is prepared by a gas phase method, and the specific surface area of ​​the white carbon black is 200-400m 2 / g.

[0036] The viscosity of the vinyl silicone oil is 50,000-100,000, and the hydrogen content of the hydrogen-containing silicone oil is 0.5-0.75%.

[0037] The hand-feel powder is prepared by a gas phase method, and the particle size of the hand-feel powder is 4-6 μm. Preferably, the hand-feel powder can be Degussa matting powder AT3600, Tosoh matting powder E-1009, etc.

[0038] The platinum catalyst is 5000 ppm of platinum catalyst.

[0039] The diluent is an alkane solvent, such as isododecane, hexadecane, odorless kerosene, etc.; and the inhibitor is one or two of ethynyl cyclohexanol and methyl butynol.

[0040] The present invention also provides a preparation process of a silicone leather dry and smooth feel surface adhesive, comprising the following steps:

[0041] A. Add the base glue, vinyl silicone resin and diluent into the planetary mixer, and then control the planetary mixer to stir for 9-12 minutes; the amount of diluent added is 60-80% of the total amount of diluent;

[0042] B. Add the hand-feel powder into the planetary mixer, and then control the planetary mixer to mix for 9-12 minutes;

[0043] C. Add vinyl silicone oil, hydrogen silicone oil, inhibitor, platinum catalyst and remaining diluent into the planetary mixer, then turn on the vacuum and continue stirring for 9-12 minutes.

[0044] In order to ensure that each step is executed in place, the present invention can be used in conjunction with an intelligent system, specifically: in step B, a visual device is used to acquire images of the inside of the mixer, and whether the colloid has particles is determined from the acquired images; when it is determined that the colloid has no particles, it is necessary to continue observing for 30-60 seconds, and stirring is always performed during the observation process. When the colloid still has no particles within the observation time, it proves that the mixing meets the requirements and the hand-feeling powder can be added.

[0045] The visual device can use an industrial camera, and the specific pixels can be set according to the particle conditions observed by the naked eye. The use of a visual device combined with in-depth training is more accurate than human observation through the naked eye, so as to ensure the performance of the surface adhesive and the uniformity of material mixing.

[0046] After the execution of step C, the material obtained has a certain viscosity due to its stickiness, and part of it will stick to the inner wall of the mixer (i.e., the cylinder wall). Therefore, before executing step D, it is necessary to shovel the material on the inner wall of the mixer, and then perform step D to add a diluent for stirring to reduce the viscosity. The action of shoveling the material can be done by manual shoveling or mechanical shoveling, and the inner wall of the mixer is checked in combination with a visual device. When it is checked that the thickness of the material stuck to the inner wall of the mixer is lower than the preset value and the area occupied by the stuck material is smaller than the preset value, step D can be executed.

[0047] Wherein, the preparation method of the base glue is as follows:

[0048] A1. Put vinyl silicone oil, hexamethyldisilazane and water into a kneader and stir for 4-6 minutes; the weight of the vinyl silicone oil added is 40-50% of the total weight of the vinyl silicone oil;

[0049] A2 puts the white carbon black into the kneading machine four times, and controls the kneading machine to knead for 20-30 minutes after each addition of white carbon black;

[0050] A3. Control the kneading machine to knead for 3-5 hours;

[0051] A4. The kneader is heated to 140-160°C, and then vacuumed and maintained for 1.5-2.5h;

[0052] A5. Add the remaining vinyl silicone oil into the kneading machine three times, and knead for 20-30 minutes after each addition of vinyl silicone oil;

[0053] A6.Control the kneading machine to knead for another 20-30 minutes to obtain the base rubber.

[0054] Specifically, in step A2, the weight of the white carbon black fed into the kneader each time accounts for 25-35%, 25-35%, 20-40%, and 20-40% of the total weight of the white carbon black respectively.

[0055] The preparation of the base rubber is mainly done by kneading the vinyl silicone oil, hexamethyldisilazane and water through a kneading machine, and then adding white carbon black for kneading. Hexamethyldisilazane modifies white carbon black, which can change the hydrophilicity of white carbon black to lipophilicity, making it easier to disperse. The high-speed shearing of the kneading machine makes the vinyl silicone oil and white carbon black combine more fully, which is convenient for improving the performance of the base rubber.

[0056] In step A5, the uniformity of the material is judged by the system after the visual device captures the image. The main basis for judgment is: capture the material in the captured image, and then judge whether the grayscale of different positions of the material is consistent or the difference is within 3%. If it exceeds 3%, it is necessary to continue kneading. The grayscale judgment of the material needs to last for at least 30 seconds, that is, in the image captured within 30 seconds, the error of the grayscale value of different positions of the material is less than 3%, which can be considered to be kneaded uniformly.

[0057] In order to reduce errors, all captured images need to undergo brightness compensation, that is, after comparing the current brightness inside the kneading machine with the preset reference brightness, the image is brightness compensated based on the difference between the two to ensure that the grayscale of the material displayed in all images is within the preset reference brightness.

[0058] That is, the specific execution of step A2 can be referred to as follows:

[0059] A21. The weight of the first input kneading white carbon black is 30% of the total weight, and then the kneading machine is controlled to knead the material inside for 20-30min;

[0060] A22. The weight of the second input kneading white carbon black is 30% of the total weight, and then the kneading machine is controlled to knead the material inside for 20-30min;

[0061] A23. The weight of the silica put into the kneading for the third time was 20% of the total weight, and then the kneading machine was controlled to knead the material inside for 20-30min;

[0062] A23. The weight of the fourth amount of white carbon black added to the kneading is 20% of the total weight, and then the kneading machine is controlled to knead the material inside for 20-30 minutes.

[0063] Specifically, in step A5, the weight of the vinyl silicone oil added each time accounts for 8-12%, 13-18%, and 26-35% of the total weight of the vinyl silicone oil.

[0064] Similarly, the specific execution steps of step A5 can be referred to as follows:

[0065] A51 first input kneading machine vinyl silicone oil weight accounted for 10% of the total weight of vinyl silicone oil, and then control the kneading machine kneading the internal material 20-30min;

[0066] A52 first input kneading machine vinyl silicone oil weight accounted for 15% of the total weight of vinyl silicone oil, and then control the kneading machine kneading the internal material 20-30min;

[0067] A53. The weight of the vinyl silicone oil put into the kneading machine for the first time accounts for 30% of the total weight of the vinyl silicone oil, and then the kneading machine is controlled to knead the internal materials for 20-30 minutes.

[0068] The total weight percentage of the vinyl silicone oil added three times is 45%, which is exactly the remaining amount after satisfying step A1.

[0069] The present invention is described below by combining specific examples with comparative examples:

[0070] Example 1

[0071] In this embodiment, the following materials are used in parts by weight: 50 parts of base glue, 50 parts of vinyl silicone resin, 100 parts of diluent, 25 parts of hand feeling powder, 12 parts of hydrogenated silicone oil, 0 parts of vinyl silicone oil, 0.12 parts of inhibitor, and 0.5 parts of platinum catalyst.

[0072] The base glue comprises the following materials in parts by weight: 1400 parts of 100,000 vinyl silicone oil, 400 parts of HS-200 white carbon black, 120 parts of hexamethyldisilazane, and 36 parts of water.

[0073] The preparation process of this embodiment includes the following steps:

[0074] A1. Put vinyl silicone oil, hexamethyldisilazane and water into a kneader and stir for 6 minutes; the weight of the vinyl silicone oil added is 45% of the total weight of the vinyl silicone oil;

[0075] A2 puts the white carbon black into the kneading machine four times, and controls the kneading machine to knead for 20-30 minutes after each addition of white carbon black;

[0076] A3. Control the kneading machine to knead for 4 hours;

[0077] A4. The kneader was heated to 150°C and then vacuumed and maintained for 2 hours;

[0078] A5. Add the remaining vinyl silicone oil into the kneading machine three times, and knead for 20-30 minutes after each addition of vinyl silicone oil;

[0079] A6.Control the kneading machine to knead for another 20-30 minutes to obtain the base rubber.

[0080] A. Add the base glue, vinyl silicone resin and diluent into a planetary mixer, and then control the planetary mixer to stir for 10 minutes; wherein, the weight portion of the added diluent is 70 parts;

[0081] B. Add the hand-feel powder into the planetary mixer, and then control the planetary mixer to stir for 10 minutes;

[0082] C. Add the remaining diluent into the planetary mixer, then turn on the vacuum of the planetary mixer and continue stirring for 10 minutes under vacuum.

[0083] Example 2

[0084] In this embodiment, the following materials are used in parts by weight: 40 parts of base glue, 60 parts of vinyl silicone resin, 80 parts of diluent, 30 parts of hand feeling powder, 12 parts of hydrogenated silicone oil, 10 parts of vinyl silicone oil, 0.12 parts of inhibitor, and 0.5 parts of platinum catalyst.

[0085] The base glue comprises the following materials in parts by weight: 1600 parts of 100,000 vinyl silicone oil, 600 parts of HS-200 white carbon black, 180 parts of hexamethyldisilazane, and 50 parts of water.

[0086] The preparation process of this embodiment includes the following steps:

[0087] A1. Put vinyl silicone oil, hexamethyldisilazane and water into a kneader and stir for 6 minutes; the weight of the vinyl silicone oil added is 45% of the total weight of the vinyl silicone oil;

[0088] A2 puts the white carbon black into the kneading machine four times, and controls the kneading machine to knead for 20-30 minutes after each addition of white carbon black;

[0089] A3. Control the kneading machine to knead for 4 hours;

[0090] A4. The kneader was heated to 150°C and then vacuumed and maintained for 2 hours;

[0091] A5. Add the remaining vinyl silicone oil into the kneading machine three times, and knead for 20-30 minutes after each addition of vinyl silicone oil;

[0092] A6.Control the kneading machine to knead for another 20-30 minutes to obtain the base rubber.

[0093] A. Add the base glue, vinyl silicone resin and diluent into a planetary mixer, and then control the planetary mixer to stir for 10 minutes; wherein, 56 parts by weight of the diluent are added;

[0094] B. Add the hand-feel powder into the planetary mixer, and then control the planetary mixer to stir for 10 minutes;

[0095] C. Add the remaining diluent into the planetary mixer, then turn on the vacuum of the planetary mixer and continue stirring for 10 minutes under vacuum.

[0096] Example 3

[0097] In this embodiment, the following materials are used in parts by weight: 30 parts of base glue, 70 parts of vinyl silicone resin, 80 parts of diluent, 30 parts of hand feeling powder, 13 parts of hydrogenated silicone oil, 15 parts of vinyl silicone oil, 0.13 parts of inhibitor, and 0.5 parts of platinum catalyst.

[0098] The base glue comprises the following materials in parts by weight: 1500 parts of 100,000 vinyl silicone oil, 500 parts of HS-200 white carbon black, 125 parts of hexamethyldisilazane, and 37 parts of water.

[0099] The preparation process of this embodiment includes the following steps:

[0100] A1. Put vinyl silicone oil, hexamethyldisilazane and water into a kneader and stir for 6 minutes; the weight of the vinyl silicone oil added is 45% of the total weight of the vinyl silicone oil;

[0101] A2 puts the white carbon black into the kneading machine four times, and controls the kneading machine to knead for 20-30 minutes after each addition of white carbon black;

[0102] A3. Control the kneading machine to knead for 4 hours;

[0103] A4. The kneader was heated to 150°C and then vacuumed and maintained for 2 hours;

[0104] A5. Add the remaining vinyl silicone oil into the kneading machine three times, and knead for 20-30 minutes after each addition of vinyl silicone oil;

[0105] A6.Control the kneading machine to knead for another 20-30 minutes to obtain the base rubber.

[0106] A. Add the base glue, vinyl silicone resin and diluent into a planetary mixer, and then control the planetary mixer to stir for 10 minutes; wherein, 56 parts by weight of the diluent are added;

[0107] B. Add the hand-feel powder into the planetary mixer, and then control the planetary mixer to stir for 10 minutes;

[0108] C. Add the remaining diluent into the planetary mixer, then turn on the vacuum of the planetary mixer and continue stirring for 10 minutes under vacuum.

[0109] Example 4

[0110] In this embodiment, the following materials are used in parts by weight: 20 parts of base glue, 80 parts of vinyl silicone resin, 50 parts of diluent, 10 parts of hand feeling powder, 15 parts of hydrogenated silicone oil, 10 parts of vinyl silicone oil, 0.07 parts of inhibitor, and 0.3 parts of platinum catalyst.

[0111] The base glue comprises the following materials in parts by weight: 1500 parts of 100,000 vinyl silicone oil, 400 parts of HS-200 white carbon black, 120 parts of hexamethyldisilazane, and 36 parts of water.

[0112] The preparation process of this embodiment includes the following steps:

[0113] A1. Put vinyl silicone oil, hexamethyldisilazane and water into a kneader and stir for 6 minutes; the weight of the vinyl silicone oil added is 45% of the total weight of the vinyl silicone oil;

[0114] A2 puts the white carbon black into the kneading machine four times, and controls the kneading machine to knead for 20-30 minutes after each addition of white carbon black;

[0115] A3. Control the kneading machine to knead for 4 hours;

[0116] A4. The kneader was heated to 150°C and then vacuumed and maintained for 2 hours;

[0117] A5. Add the remaining vinyl silicone oil into the kneading machine three times, and knead for 20-30 minutes after each addition of vinyl silicone oil;

[0118] A6.Control the kneading machine to knead for another 20-30 minutes to obtain the base rubber.

[0119] A. Add the base glue, vinyl silicone resin and diluent into a planetary mixer, and then control the planetary mixer to stir for 10 minutes; wherein, 35 parts by weight of the diluent is added;

[0120] B. Add the hand-feel powder into the planetary mixer, and then control the planetary mixer to stir for 10 minutes;

[0121] C. Add the remaining diluent into the planetary mixer, then turn on the vacuum of the planetary mixer and continue stirring for 10 minutes under vacuum.

[0122] Example 5

[0123] In this embodiment, the following materials are used in parts by weight: 40 parts of base glue, 60 parts of vinyl silicone resin, 80 parts of diluent, 20 parts of hand feeling powder, 12 parts of hydrogenated silicone oil, 0 parts of vinyl silicone oil, 0.1 parts of inhibitor, and 0.4 parts of platinum catalyst.

[0124] The base glue comprises the following materials in parts by weight: 1600 parts of 100,000 vinyl silicone oil, 400 parts of HS-200 white carbon black, 120 parts of hexamethyldisilazane, and 36 parts of water.

[0125] The preparation process of this embodiment includes the following steps:

[0126] A1. Put vinyl silicone oil, hexamethyldisilazane and water into a kneader and stir for 6 minutes; the weight of the vinyl silicone oil added is 45% of the total weight of the vinyl silicone oil;

[0127] A2 puts the white carbon black into the kneading machine four times, and controls the kneading machine to knead for 20-30 minutes after each addition of white carbon black;

[0128] A3. Control the kneading machine to knead for 4 hours;

[0129] A4. The kneader was heated to 150°C and then vacuumed and maintained for 2 hours;

[0130] A5. Add the remaining vinyl silicone oil into the kneading machine three times, and knead for 20-30 minutes after each addition of vinyl silicone oil;

[0131] A6.Control the kneading machine to knead for another 20-30 minutes to obtain the base rubber.

[0132] A. Add the base glue, vinyl silicone resin and diluent into a planetary mixer, and then control the planetary mixer to stir for 10 minutes; wherein, 56 parts by weight of the diluent are added;

[0133] B. Add the hand-feel powder into the planetary mixer, and then control the planetary mixer to stir for 10 minutes;

[0134] C. Add the remaining diluent into the planetary mixer, then turn on the vacuum of the planetary mixer and continue stirring for 10 minutes under vacuum.

[0135] Comparative Example 1

[0136] In this embodiment, the following materials are used in parts by weight: 80 parts of base glue, 20 parts of vinyl silicone resin, 100 parts of diluent, 30 parts of hand feeling powder, 8 parts of hydrogenated silicone oil, 5 parts of vinyl silicone oil, 0.2 parts of inhibitor, and 0.5 parts of platinum catalyst.

[0137] The base glue comprises the following materials in parts by weight: 1400 parts of 100,000 vinyl silicone oil, 500 parts of HS-200 white carbon black, 125 parts of hexamethyldisilazane, and 37 parts of water.

[0138] The preparation process of this embodiment includes the following steps:

[0139] A1. Put vinyl silicone oil, hexamethyldisilazane and water into a kneader and stir for 6 minutes; the weight of the vinyl silicone oil added is 45% of the total weight of the vinyl silicone oil;

[0140] A2 puts the white carbon black into the kneading machine four times, and controls the kneading machine to knead for 20-30 minutes after each addition of white carbon black;

[0141] A3. Control the kneading machine to knead for 4 hours;

[0142] A4. The kneader was heated to 150°C and then vacuumed and maintained for 2 hours;

[0143] A5. Add the remaining vinyl silicone oil into the kneading machine three times, and knead for 20-30 minutes after each addition of vinyl silicone oil;

[0144] A6.Control the kneading machine to knead for another 20-30 minutes to obtain the base rubber.

[0145] A. Add the base glue and diluent into the planetary mixer, and then control the planetary mixer to stir for 10 minutes; wherein, 70 parts by weight of the diluent is added;

[0146] B. Add the hand-feel powder into the planetary mixer, and then control the planetary mixer to stir for 10 minutes;

[0147] C. Add the remaining diluent into the planetary mixer, then turn on the vacuum of the planetary mixer and continue stirring for 10 minutes under vacuum.

[0148] Comparative Example 2

[0149] In this embodiment, the following materials are used in parts by weight: 40 parts of base glue, 60 parts of vinyl silicone resin, 80 parts of diluent, 0 parts of hand feeling powder, 12 parts of hydrogenated silicone oil, 5 parts of vinyl silicone oil, 0.1 parts of inhibitor, and 0.4 parts of platinum catalyst.

[0150] The base glue comprises the following materials in parts by weight: 1400 parts of 100,000 vinyl silicone oil, 400 parts of HS-200 white carbon black, 80 parts of hexamethyldisilazane, and 20 parts of water.

[0151] The preparation process of this embodiment includes the following steps:

[0152] A. Vinyl silicone resin and diluent are added into a planetary mixer, and then the planetary mixer is controlled to stir for 10 minutes; wherein, 56 parts by weight of the diluent are added;

[0153] B. Add the hand-feel powder into the planetary mixer, and then control the planetary mixer to stir for 10 minutes;

[0154] C. Add the remaining diluent into the planetary mixer, then turn on the vacuum and continue stirring for 10 minutes.

[0155] The test results of each sample are shown in the following table:

[0156]

[0157] In the above test results, the viscosity test was performed by a rotary viscometer at 25°C; the Martindale wear test was performed at a test speed of 48 times / min and a load of 585g to measure the weight loss after 75,000 frictions.

[0158] In comparison group 1, due to the small proportion of vinyl silicone resin, the hardness is significantly reduced, and more obvious wear is observed after the Martindale test. Even if a lot of hand feel powder is added, the hand feel is still astringent, and there is no dry and slippery effect at all.

[0159] In comparison group 2, since no feel powder was added, although the mechanical properties of the rubber were very good, and the tensile strength and tear strength were better than those of other groups, the feel was very poor, there was no dry and slippery effect, and obvious wear and tear occurred after the Martindale test.

[0160] It can be seen from the above test results that the silicone leather dry and smooth feel surface adhesive prepared by the present invention has excellent viscosity, hardness, tensile strength, tear strength and wear resistance; because it contains feel powder and a sufficient weight of vinyl silicone resin, it can be used as a surface adhesive to ensure a dry and smooth feel while ensuring performance and service life.

[0161] 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 silicone leather dry and smooth feel surface adhesive, characterized in that: The composition comprises the following materials in parts by weight:

2. The silicone leather dry and slippery feel adhesive according to claim 1, characterized in that: The base glue comprises the following materials in parts by weight:

3. The silicone leather dry and slippery feel adhesive according to claim 2, characterized in that: The white carbon black is prepared by a gas phase method, and the specific surface area of ​​the white carbon black is 200-400m 2 / g.

4. The silicone leather dry and slippery feel adhesive according to claim 1, characterized in that: The viscosity of the vinyl silicone oil is 50,000-100,000, and the hydrogen content of the hydrogen-containing silicone oil is 0.5-0.75%.

5. The silicone leather dry and slippery feel adhesive according to claim 1, characterized in that: The hand-feeling powder is prepared by a gas phase method, and the particle size of the hand-feeling powder is 4-6 μm.

6. The silicone leather dry and smooth feel surface adhesive according to claim 1, characterized in that: The diluent is an alkane solvent, and the inhibitor is one or both of ethynyl cyclohexanol and methyl butynol.

7. A preparation process for a silicone leather dry and smooth feel surface adhesive, characterized in that: The following steps are involved: A. Add the base glue, vinyl silicone resin and diluent into a planetary mixer, and then control the planetary mixer to stir for 9-12 minutes; wherein the weight portion of the added diluent is 35-70 parts; B. Add the hand-feel powder into the planetary mixer, and then control the planetary mixer to mix for 9-12 minutes; C. Add vinyl silicone oil, hydrogen silicone oil, inhibitor, platinum catalyst and remaining diluent into the planetary mixer; D. Turn on the vacuum on the planetary mixer and then stir for 9-12 minutes.

8. The preparation process of the silicone leather dry and smooth feel surface adhesive according to claim 7, characterized in that: The preparation method of the base glue is as follows: A1. Put vinyl silicone oil, hexamethyldisilazane and water into a kneader and stir for 4-6 minutes; the weight of the vinyl silicone oil added is 40-50% of the total weight of the vinyl silicone oil; A2 puts the white carbon black into the kneading machine four times, and controls the kneading machine to knead for 20-30 minutes after each addition of white carbon black; A3. Control the kneading machine to knead for 3-5 hours; A4. The kneader is heated to 140-160°C, and then vacuumed and maintained for 1.5-2.5h; A5. Add the remaining vinyl silicone oil into the kneading machine three times, and knead for 20-30 minutes after each addition of vinyl silicone oil; A6.Control the kneading machine to knead for another 20-30 minutes to obtain the base rubber.

9. The preparation process of the silicone leather dry and smooth feel surface adhesive according to claim 7, characterized in that: In step A2, the weight of the white carbon black added to the kneader each time accounts for 25-35%, 25-35%, 15-25%, and 15-25% of the total weight of the white carbon black respectively.

10. The preparation process of the silicone leather dry and smooth feel surface adhesive according to claim 7, characterized in that: In step A5, the weight of the vinyl silicone oil added each time accounts for 8-12%, 13-18% and 26-35% of the total weight of the vinyl silicone oil respectively.

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