CN115895268A

CN115895268A - Tear-resistant silica gel leather and preparation process and application thereof

Info

Publication number: CN115895268A
Application number: CN202210838224.4A
Authority: CN
Inventors: 薛志勇
Original assignee: Jiangmen Aozhuo Industrial Co ltd
Current assignee: Jiangmen Aozhuo Industrial Co ltd
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2023-04-04
Anticipated expiration: 2042-07-14
Also published as: CN115895268B

Abstract

The invention discloses tear-resistant silica gel leather, which is prepared by mixing raw silica gel, inorganic filler, polysiloxane, functional auxiliary agent and surface modifier to obtain a high-molecular silicon material, and the silica gel leather prepared by using a specific leather preparation process has excellent weather resistance, acid and alkali resistance, flame retardance, wear resistance and tear resistance. And a platinum vulcanization system is selected, so that the method is free of solvent, good in environmental protection performance and free of a large amount of waste gas. The system is solid silica gel, specifically is long chain level silica gel, and the easy doping material of inclusion is good, reaches the fire resistance, has resistant tear strength simultaneously, reaches the level of highest grade solid silica gel.

Description

Tear-resistant silica gel leather and preparation process and application thereof

Technical Field

The invention relates to the field of preparation of high polymer silicon materials, D06N3/00, in particular to tear-resistant silica gel leather and a preparation process and application thereof.

Background

Natural leather has excellent hand feeling, good air permeability, flame retardance, durability and good tearing strength, but has poor corrosion resistance and color fastness, great difficulty in waste treatment and special smell. The odor and the corrosion resistance of the high molecular silicon material synthetic leather can be improved. The high molecular silicon material is a novel environment-friendly material, is tasteless and nontoxic, and has excellent weather resistance, electric insulation, oxidation resistance, aging resistance, light resistance, mildew resistance and chemical stability. The food-grade silicon material can be used as articles which are in direct contact with human bodies, such as baby articles, kitchenware, car interior trims and the like. However, liquid silicone gel has poor abrasion resistance and tear strength. The solid silica gel has excellent acid and alkali resistance, weather resistance, ultraviolet resistance and high and low temperature resistance, but has no flame retardance. With the enhancement of environmental awareness, most of flame retardants used in synthetic leather are inorganic flame retardants, but liquid silica gel is short-chain silica gel, and the tearing resistance of the synthetic leather is poor due to the excessively high content of the inorganic flame retardants, and the flame retardant effect is not ideal due to the poor compatibility of the synthetic leather with a system. Therefore, the synthesis of the high polymer silicon material synthetic leather with excellent tearing resistance and strong flame retardance has important significance in multiple fields.

Patent CN201711112962.6 discloses a preparation method of a silicone rubber composite molded material, which is obtained by mixing and vulcanizing methyl vinyl silicone rubber, fumed silica, precipitated silica, hydroxy silicone oil, active aluminum hydroxide, zinc stearate, iron oxide red, cerium oxide and a bis-penta vulcanizing agent.

Disclosure of Invention

In order to solve the above problems, the first aspect of the present invention provides a tear-resistant silicone leather, which is prepared from the following raw materials: 85 to 120 parts of crude silica gel, 40 to 120 parts of inorganic filler, 5 to 15 parts of polysiloxane, 0.05 to 1 part of functional assistant and 0.1 to 2 parts of surface modifier.

In some preferred embodiments, the raw silicone rubber is selected from at least one of phenyl raw silicone rubber, methyl vinyl raw silicone rubber, methyl phenyl vinyl raw silicone rubber, linear polydimethylsiloxane, and fluorosilicone raw silicone rubber; preferably, the raw silicone rubber is methyl vinyl raw silicone rubber; further preferably, the methyl vinyl silicone rubber comprises a first methyl vinyl silicone rubber and a second methyl vinyl silicone rubber.

In some preferred embodiments, the mass ratio of the first methyl vinyl silicone raw rubber to the second methyl vinyl silicone raw rubber is (2.5-3.5): (5-7.5); preferably, the mass ratio of the first methyl vinyl silicone raw rubber to the second methyl vinyl silicone raw rubber is 3:7.

in some preferred embodiments, the methyl vinyl silicone gum has an average molecular weight of 40 to 90 ten thousand and a vinyl content of 0.03 to 0.5 weight percent; preferably, the average molecular weight of the methyl vinyl silicone crude rubber is 45-85 ten thousand, and the vinyl content is 0.13-0.18 wt%.

In some preferred embodiments, the second vinyl silicone gum has an average molecular weight of 40 to 90 ten thousand and a vinyl content of 0.02 to 0.1 weight percent; preferably, the average molecular weight of the second vinyl silicone raw rubber is 45-85 ten thousand, and the vinyl content is 0.03-0.06 wt%.

In some preferred embodiments, the inorganic filler is selected from at least one of kaolin, white carbon, zinc oxide, talc, light calcium carbonate, magnesium hydroxide, aluminum hydroxide, zinc borate; preferably, the inorganic filler is white carbon and aluminum hydroxide.

In some preferred embodiments, the weight ratio of the white carbon black to the aluminum hydroxide is (10-20): (60-75); preferably, the weight ratio of the white carbon black to the aluminum hydroxide is 16:70.

in some preferred embodiments, the silica is selected from at least one of precipitated silica and fumed silica; preferably, the white carbon black is fumed silica.

In some preferred embodiments, the fumed silica has a specific surface area of 150 to 275m ² (ii)/g, 45 mu m screen residue is less than or equal to 270mg/kg, and the pH value of the suspension is 3-5; preferably, the specific surface area of the fumed silica is 185-225 m ² 45 mu m/g sieveThe residue is less than or equal to 250mg/kg, and the pH value of the suspension is 3.7-4.5; more preferably, the fumed silica has a specific surface area of 185.25m ² Perg, 45 μm screen residue < 250mg/kg, suspension pH 4.2.

In some preferred embodiments, the aluminum hydroxide has a particle size of 10 to 30 μm, siO ₂ Is less than 0.1wt%, fe ₂ O ₃ The content of (A) is less than 0.08wt%, and the whiteness is more than 92%; preferably, the particle size of the aluminum hydroxide is 10 to 20 μm, siO ₂ Is less than 0.04wt%, fe ₂ O ₃ The content of (A) is less than 0.03wt%, and the whiteness is more than 95; further preferably, the particle size of the aluminum hydroxide is 14 μm, siO ₂ 0.03wt% of (B), fe ₂ O ₃ Has a content of 0.009wt% and a whiteness of 96.

The molecular chain of the silicone rubber is relatively smooth, and acting force between chains is weaker, so the application finds that the mechanical property and the flame retardant property of the obtained silicone rubber can be changed by adding the inorganic filler in the preparation process of the high-molecular silicon material, and particularly, the inorganic filler is white carbon black and aluminum hydroxide, so that the improvement of the tearing strength resistance and the enhancement of the flame retardant property are facilitated. Presumably, the synergistic effect of the fumed silica and the aluminum hydroxide with a certain particle size can increase the shearing force and the fluidity of the inorganic filler particles during the mixing of the silica gel, so as to increase the dispersibility of the filler particles, and the active groups on the surface of the fumed silica can be physically or chemically bonded with the silica gel molecules to form a three-dimensional network structure, so that the phase change of the silica gel leather is effectively inhibited, and the reinforcing effect is achieved. The applicant unexpectedly found that when the weight ratio of the white carbon black to the aluminum hydroxide is (10-20): (60-75), the shrinkage rate of the silica gel leather product can be reduced while the tear strength, the tensile strength, the flame retardance and the wear resistance are further improved, and the texture and the shape of a final product are not affected.

In some preferred embodiments, the polysiloxane is selected from at least one of amino silicone oil, hydroxyl silicone oil, carboxyl silicone oil, dihydroxy silicone oil, hydrogen-containing silicone oil, vinyl fluorine-containing silicone oil, vinyl hydroxyl silicone oil, perfluoropolyether silicone oil; preferably, the polysiloxane is a hydroxy silicone oil and a vinyl hydroxy silicone oil.

In some preferred embodiments, the weight ratio of the hydroxyl silicone oil to the vinyl hydroxyl silicone oil is (3 to 7): (1-5); preferably, the weight ratio of the hydroxyl silicone oil to the vinyl hydroxyl silicone oil is 5:3.

in some preferred embodiments, the hydroxy silicone oil has a viscosity of 30 to 55mm at 25 ℃ ^2/ s, the hydroxyl content is 3-6%; preferably, the hydroxyl silicone oil has a viscosity of 38 to 45mm at 25 DEG C ² (s) the hydroxyl group content is 3.6-4.5 wt%.

In some preferred embodiments, the vinyl hydroxyl silicone oil has a viscosity of 5 to 20cs at 25 ℃, a hydroxyl content of 1.5 to 7wt%, and a vinyl content of 0.05 to 1wt%; preferably, the vinyl hydroxyl silicone oil has a viscosity of 12cs at 25 ℃, a hydroxyl content of 4wt%, and a vinyl content of 0.1wt%.

The compatibility of inorganic fillers with silicone systems is poor and excessive addition can result in a reduction in the tear strength of the silicone leather. The applicant adds polysiloxane into the system, especially polysiloxane is hydroxyl silicone oil and vinyl hydroxyl silicone oil, which can effectively improve the compatibility of the system and increase the doping amount of inorganic filler. The probable reasons are that the viscosity of the hydroxyl silicone oil and the viscosity of the vinyl hydroxyl silicone oil are appropriate, the specific molecular structure and the active group can reduce the surface tension among components in a system, increase the weak intermolecular acting force, further enhance the dispersibility and the fluidity of the filler in the system and enhance the flame retardant property in the system, and the vinyl active bond in the vinyl hydroxyl silicone oil can react with the active group of the inorganic filler to play a role in structure control and simultaneously perform a cross-linking reaction with the group in the raw rubber, so that the structural stability and the tearing strength of the silica gel leather are further increased.

The applicant has found that, when the weight ratio of hydroxy silicone oil to vinyl hydroxy silicone oil is (3 to 7): (1-5), the specific hydroxyl content and vinyl content are cooperated with other components in the system, and under the specific preparation process, the obtained silica gel leather can show remarkable antistatic property, the flame retardance reaches the highest grade A, and the tearing strength reaches 46KN/m.

In some preferred embodiments, the functional aid is selected from at least one of stearic acid, palmitic acid, oleic acid, calcium stearate, zinc stearate, microcrystalline paraffin, polyethylene wax, magnesium stearate; preferably, the release agent is a zinc salt of octadecanoic acid.

In some preferred embodiments, the zinc salt of octadecanoic acid is selected from at least one of powdered zinc salt of octadecanoic acid, pasty zinc salt of octadecanoic acid; preferably, the zinc salt of octadecanoic acid is pasty zinc salt of octadecanoic acid; further preferably, the average molecular weight of the pasty zinc octadecanoate salt is 40-80 ten thousand; still more preferably, the pasty zinc salt of octadecanoic acid has an average molecular weight of 60 ten thousand.

In some preferred embodiments, the addition of the inorganic filler in the present application, while playing a role of reinforcement, may cause a problem of difficulty in mold release during molding, and the like. And the functional auxiliary agent, especially the zinc salt of octadecanoic acid, can obviously improve the problem of demoulding. However, the zinc salt of octadecanoic acid contained in an excessive amount resulted in a decrease in hardness and tear strength. The applicant finds that the pasty zinc stearate is added into the system, the average molecular weight of the pasty zinc stearate is 60 thousands, and the pasty zinc stearate and other components in the surface modifier and the system have synergistic effect, so that excellent demolding effect can be guaranteed, the resilience of leather is increased, more importantly, the later-stage corona treatment process is facilitated, the bonding strength between cloth and vulcanized high-polymer silicon materials is increased, the use of glue is avoided, and the environmental friendliness is improved.

In some preferred embodiments, the surface modifying agent is selected from the group consisting of aminopropyltriethoxysilane, gamma-glycidoxypropyltrimethoxysilane, aminopropyltriethoxysilane, gamma-aminopropyltrimethoxysilane, vinyltrimethoxysilane, butyl titanate, bis (triethoxypropyl) tetrasulfide, 3-aminopropyltriethoxysilane; preferably, the surface modifier is vinyltrimethoxysilane (available from Dow Corning, USA).

The second aspect of the invention provides a preparation method of tear-resistant silica gel leather, which comprises the following steps:

s1, weighing the preparation raw materials in proportion, heating to react, putting into a kneading machine, discharging, filtering to obtain the high-molecular silicon material, and vulcanizing.

S2, extruding the material obtained in the S1 by adopting a four-roller calender, and paving a grain film at the bottom;

s3, performing corona treatment on the cloth by using plasma, and attaching the cloth to the surface of the silica gel;

s4, conveying the primary formed leather obtained in the S3 into a drying tunnel, and heating and drying the primary formed leather;

s5, realizing natural cooling through cooling water under the action of tension by a three-roller machine, and then stripping and rolling;

and S6, conveying the leather into a coating production line, coating a wear-resistant coating on the surface, and conveying the leather into a drying channel to be dried.

In some preferred embodiments, the specific preparation operation of the polymeric silicon material in S1 is as follows: putting the crude silicone rubber, the silicone oil, the release agent and the surface modifier into a kneading machine, heating to 130 ℃, stirring for 1h, then averagely putting the inorganic filler into the kneading machine, vacuumizing for 70-100 min after agglomeration, discharging, and filtering by a filter with a filter screen of 100-300 meshes to obtain the macromolecular silicon material.

In some preferred embodiments, the specific operations of the vulcanization in S1 are: and mixing the macromolecular silicon material with a vulcanizing agent, adding the mixture into an open mill, mixing and molding, extruding the mixture through an extruder, and vulcanizing the mixture through a vulcanizing machine to obtain the high-molecular silicon material.

In some preferred embodiments, the weight ratio of the polymer silicon material to the vulcanizing agent is (130-140): 1; preferably, the weight ratio of the high-molecular silicon material to the vulcanizing agent is 135:1.

in some preferred embodiments, the vulcanizing agent is selected from at least one of benzoyl peroxide, 2, 4-dichlorobenzoyl peroxide, platinum vulcanizing agent, 2, 5-dimethyl-2, 5-di-t-butylperoxysilane, dicumyl peroxide; preferably, the sulfiding agent is a platinum sulfiding agent.

In some preferred embodiments, the vulcanization temperature is 120 to 150 ℃ and the time is 5 to 15min; preferably, the vulcanization temperature is 140 ℃ and the time is 10min.

In some preferred embodiments, the S2 middle grain film is at least one selected from PP grain film, PET transfer grain film, grain paper, HTR grain film; preferably, the grain film in the S2 is a PP grain film; further preferably, the bearable temperature of the PP grain film in the S2 is 110-120 ℃; still more preferably, the acceptable temperature of the PP textured film in S2 is 120 ℃.

In some preferred embodiments, the corona treatment in S3 is a ceramic plasma corona treatment.

In some preferred embodiments, the dyne value of the corona treatment is 50 to 55; preferably, the dyne value of the corona treatment is 52.

In some preferred embodiments, the speed of the corona treatment in S3 is the same as the conveying speed of the material obtained in S2; preferably, the speed of the corona treatment in S3 is 3-8 m/min, and further preferably, the speed of the corona treatment in S3 is 4-6 m/min; still more preferably, the speed of the corona treatment in S3 is 5m/min.

In some preferred embodiments, the timeliness of the corona treatment in S3 and the material obtained in S2 is 12-17S; preferably, the timeliness of the corona treatment in S3 and the material obtained in S2 is 15S.

In some preferred embodiments, the cloth is not particularly limited in the present application; preferably, the fabric in S3 is at least one selected from a knitted fabric, a woven fabric and a non-woven fabric.

In some preferred embodiments, the temperature of the bottom of the drying tunnel in S4 is 100-130 ℃, and the temperature of the top is 140-160 ℃; the bottom temperature of the drying tunnel in the S4 is 120 ℃, and the top temperature is 150 ℃.

In some preferred embodiments, the time of the heating and drying treatment in S4 is 10 to 30min; preferably, the time of the heating and drying treatment in S4 is 15min.

In some preferred embodiments, the drying temperature of the drying tunnel in the step S6 is 150-180 ℃ and the drying time is 5-15 min; preferably, the drying temperature of the drying tunnel in the step S6 is 165 ℃, and the drying time is 10min.

In some preferred embodiments, the material of the wear-resistant layer is not particularly limited in the present application; preferably, the wear-resistant layer in S6 is at least one selected from a polytetrafluoroethylene wear-resistant layer, a silicone wear-resistant layer and a polyethylene acrylate; preferably, the wear-resistant layer in S6 is a silicone wear-resistant layer.

The third aspect of the invention provides application of the tear-resistant silica gel leather in the fields of vehicle interior decoration, clothing wearing, ground traffic, aviation and navigation, indoor and outdoor, medical entertainment and children education.

Compared with the prior art, the invention has the following beneficial effects:

(1) According to the application, the high-molecular silicon material is prepared by mixing the silica gel, the inorganic filler, the polysiloxane, the functional assistant and the surface modifier, and then the silica gel leather obtained by using the specific leather preparation process has excellent weather resistance, acid and alkali resistance, flame retardance, wear resistance and tear resistance, has wide application prospects in various fields such as vehicle interior decoration, clothing wearing, ground traffic, aviation and navigation, indoor and outdoor, medical entertainment, children education and the like, and is particularly used for the vehicle interior decoration.

(2) The system is solid silica gel in this application, specifically is long chain level silica gel, and easy doping material, the inclusion is good, reaches the fire resistance, has resistant tear strength simultaneously, can reach the level of highest grade solid silica gel, and the shrinkage factor is little moreover, is about 3%, does not have obvious influence to line, shape.

(3) In the application, a platinum vulcanization system is selected to vulcanize the high-molecular silicon material to prepare the silica gel leather, so that the silica gel leather is solvent-free, good in environmental protection performance and free of a large amount of waste gas;

(4) The polymer silicon material prepared by the specific components in the application has the advantages that the problem of poor bonding strength of the silicon material in the prior art is greatly improved through the synergistic effect of the components in the corona treatment and the silicon material in the leather preparation process, the use of glue is avoided, and the environmental protection performance is further improved.

Drawings

FIG. 1 results of the stain resistance test of the sample obtained in example 1.

FIG. 2 results of the antibacterial property test of the sample obtained in example 1.

FIG. 3 shows the results of the antistatic property test of the sample obtained in example 1.

Detailed Description

Example 1

1. The tear-resistant silica gel leather is prepared from the following raw materials: the coating comprises, by weight, 100 parts of crude silicone rubber, 86 parts of inorganic filler, 8 parts of polysiloxane, 0.3 part of functional additive and 0.5 part of surface modifier.

The silicone crude rubber is methyl vinyl silicone crude rubber.

The methyl vinyl silicone crude rubber comprises a first methyl vinyl silicone crude rubber and a second methyl vinyl silicone crude rubber, wherein the mass ratio of the first methyl vinyl silicone crude rubber to the second methyl vinyl silicone crude rubber is 3:7.

the average molecular weight of the first methyl vinyl silicone crude rubber is 45-85 ten thousand, and the vinyl content is 0.13-0.18 wt% (Zhejiang Hesheng silicon Co., ltd., model: 110-2).

The average molecular weight of the second vinyl-based silicone crude rubber is 45-85 ten thousand, the vinyl content is 0.03-0.06 wt% (Zhejiang Hesheng silicon industry Co., ltd., type: 110-0)

The inorganic filler is white carbon black and aluminum hydroxide.

The weight ratio of the white carbon black to the aluminum hydroxide is 16:70.

the white carbon black is fumed silica.

The specific surface area of the fumed silica is 185.25m ² (ii) 45 μm sieve residue < 250mg/kg, and suspension pH 4.2 (available from Heshengsi GmbH, zhejiang, model: HS-200).

The granularity of the aluminum hydroxide is 14 mu m and SiO ₂ Is 0.03wt%, fe ₂ O ₃ Has a content of 0.009wt% and a whiteness of 96 (available from northern aluminum Limited of Zhengzhou, model No. 8258).

The polysiloxane is hydroxyl silicone oil and vinyl hydroxyl silicone oil.

The weight ratio of the hydroxyl silicone oil to the vinyl hydroxyl silicone oil is 5:3.

the viscosity of the hydroxyl silicone oil at 25 ℃ is 38-45 mm ² (s) a hydroxyl group content of 3.6 to 4.5wt% (Tokyo technologies, ltd., type 203D).

The viscosity of the vinyl hydroxyl silicone oil at 25 ℃ is 12cs, the hydroxyl content is 4wt%, and the vinyl content is 0.1wt% (from Austria and Oncorhyncha industries Co., ltd., jiangmen City, model 203BF 11).

The release agent is zinc octadecanoate.

The zinc octadecanoate is pasty zinc octadecanoate; the average molecular weight of the pasty zinc octadecanoate salt is 60 ten thousand (the pasty zinc octadecanoate salt is from Australian Olympic industry Co., jiangmen, and the model is CO).

The surface modifier was vinyltrimethoxysilane (available from dow corning, usa).

2. A preparation method of tear-resistant silica gel leather comprises the following steps:

s5, realizing natural cooling through cooling water under the action of tension through a three-roller machine, and then stripping and rolling;

and S6, conveying the obtained leather into a coating production line, coating a wear-resistant coating on the surface of the leather, and conveying the leather into a drying channel for drying to obtain the leather.

The specific preparation operation of the macromolecular silicon material in S1 is as follows: the method comprises the following steps of putting crude silica gel, silicone oil, a release agent and a surface modifier into a kneading machine, heating to 130 ℃, stirring for 1h, then averagely putting inorganic filler into the kneading machine, vacuumizing for 80min after agglomeration, discharging, and filtering through a filter with a 200-mesh filter screen to obtain the high-molecular silicon material.

The specific operation of the vulcanization in the S1 is as follows: and mixing the macromolecular silicon material with a vulcanizing agent, adding the mixture into an open mill, mixing and molding, extruding the mixture through an extruder, and vulcanizing the mixture through a vulcanizing machine to obtain the high-molecular silicon material.

The weight ratio of the high-molecular silicon material to the vulcanizing agent is 135:1.

the vulcanizing agent is a platinum vulcanizing agent (purchased from Australian Olympic industry Co., jiangmen, with the model number of A168).

The vulcanization temperature is 140 ℃ and the time is 10min.

The grain film PP grain film in the S2; the acceptable temperature of the PP grain film in the S2 is 120 ℃ (obtained from Quanzhou Mingfei technology Co., ltd.).

And in the S3, the corona treatment is ceramic plasma corona treatment.

The dyne value for the corona treatment was 52.

The speed of the corona treatment in the step S3 is the same as the conveying speed of the material obtained in the step S2; and the speed of the corona treatment in the S3 is 5m/min.

And the timeliness of the materials obtained by the corona treatment in the S3 and the S2 is 15S.

The fabric in S3 is selected from knitted fabrics.

The bottom temperature of the drying tunnel in the S4 is 120 ℃, and the top temperature is 150 ℃.

The time of the heating and drying treatment in the step S4 is 15min.

And the drying temperature of the drying tunnel in the step S6 is 165 ℃, and the drying time is 10min.

And the wear-resistant layer in the S6 is an organic silicon wear-resistant layer.

3. An application of tear-resistant silica gel leather is used in the fields of car interior decoration, clothing wearing, ground traffic, aviation and navigation, indoor and outdoor, medical entertainment and children education.

Example 2

1. A tear-resistant silicone leather, which differs from example 1 in that:

the preparation raw materials comprise: the coating comprises, by weight, 100 parts of crude silica gel, 90 parts of inorganic filler, 10 parts of polysiloxane, 0.4 part of functional additive and 0.5 part of surface modifier.

2. A preparation method of the tearing-resistant silica gel leather, which is the same as the example 1.

3. The application of the tearing-resistant silica gel leather is the same as that in the example 1.

Comparative example 1

1. A tear-resistant silicone leather, which differs from example 1 in that:

the weight ratio of the white carbon black to the aluminum hydroxide is 5:70.

Comparative example 2

1. A tear-resistant silicone leather, which differs from example 1 in that:

the viscosity of the vinyl hydroxyl silicone oil at 25 ℃ is less than or equal to 33mm ² (iv)/s, hydroxyl group content of 6. + -. 0.5wt%, vinyl group content of 6. + -. 0.5wt% (available from Citrin chemical technology, ltd.).

Comparative example 3

1. A tear-resistant silicone leather, which differs from example 1 in that:

the release agent is zinc octadecanoate (CAS number: 557-05-1).

Performance testing

1. The samples obtained in example 1 were tested and the results are shown in table 1.

Table 1 results of property testing of samples obtained in example 1

2. Stain resistance: the specific results of the multiple washing assays performed on the samples obtained in example 1 and the common samples on the market are shown in FIG. 1.

3. Antibacterial property: escherichia coli is selected for the performance zone experiment of the sample obtained in example 1, and other silica gel leathers in the market are selected as the comparison examples, and the results are shown in FIG. 2.

According to the test result, the silica gel leather obtained in the embodiment 1 can effectively control the bacteria on the surface of the fabric through antibacterial property, prevent mould and mildew, and reduce bacteria and peculiar smell by 99.9%.

4. And (3) antistatic test: the test piece obtained in example 1 was tested by the triboelectric voltage method. The sample (4 blocks, 2 warps, 2 wefts, 4 cm x 8 cm in size) is clamped on the rotary drum, the rotary drum rubs with standard cloth (nylon or polypropylene) at the rotating speed of 400r/min, and the maximum value (V) of the charged voltage of the sample within 1min is tested. The national standards for reference are: GJB3007-97.

According to the test result, the silicone leather obtained in the embodiment 1 can reduce the static electricity generated by the friction of passing in and out of the automobile to 50%, and has lasting functions and the same service life as the whole automobile.

5. Tensile strength, elongation, tear strength, shrinkage, rebound resilience, and burning characteristics of the samples obtained in the examples and comparative examples were measured by the methods shown in Table 1, and the structures are shown in Table 2.

TABLE 2 results of property test of samples obtained in examples and comparative examples

	Example 1	Example 2	Comparative example 1	Comparative example 2	Comparative example 3
						Hardness (A)	54	53	48	57	59
Tensile Strength (MPa)	9.5	9.2	8.8	8.1	8.6
						Elongation (%)	480	475	390	430	365
Tear Strength (N/mm)	46	45	29	37	34
						Percentage of shrinkage (%)	3.2	3.1	4.5	2.8	4.2
Combustion behavior (grade)	A	A	B	C	C

The tensile strength and the tearing strength determine the performance of the silica gel leather, and are especially important for the pinhole performance of leather sewing, so that the tensile strength of the silica gel is more than 9.5MPa, the tearing strength is more than 46N/mm, the important index for the safety of the leather is the burning characteristic, at least reaching the A grade, and as can be seen from the table 2, the performance of the product obtained in the example 1 is the best.

Claims

1. The tear-resistant silica gel leather is characterized by comprising the following preparation raw materials: 85 to 120 portions of crude silica gel, 40 to 120 portions of inorganic filler, 5 to 15 portions of polysiloxane, 0.05 to 1 portion of functional additive and 0.1 to 2 portions of surface modifier.

2. A tear-resistant silica gel leather according to claim 1, wherein the silica gel is at least one selected from the group consisting of phenyl silica gel, methyl vinyl silica gel, methyl phenyl vinyl silica gel, linear polydimethylsiloxane, and fluorosilicone gel.

3. The tear-resistant silicone leather according to claim 1 or 2, wherein the silicone gum is methyl vinyl silicone gum;

the methyl vinyl silicone raw rubber comprises a first methyl vinyl silicone raw rubber and a second methyl vinyl silicone raw rubber;

the mass ratio of the first methyl vinyl silicone crude rubber to the second methyl vinyl silicone crude rubber is (2.5-3.5): (5-7.5).

4. The tear-resistant silica gel leather of claim 1, wherein the inorganic filler is at least one selected from kaolin, white carbon, zinc oxide, talc, light calcium carbonate, magnesium hydroxide, aluminum hydroxide, and zinc borate.

5. The tear-resistant silica gel leather according to claim 4, wherein the inorganic filler is white carbon black and aluminum hydroxide;

the weight ratio of the white carbon black to the aluminum hydroxide is (10-20): (60-75).

6. The tear-resistant silicone leather according to claim 1, wherein the polysiloxane is at least one selected from amino silicone oil, hydroxyl silicone oil, carboxyl silicone oil, dihydroxy silicone oil, hydrogen-containing silicone oil, vinyl fluorine-containing silicone oil, vinyl hydroxyl silicone oil and perfluoropolyether silicone oil.

7. The tear-resistant silicone leather according to claim 6, wherein the polysiloxane is hydroxy silicone oil and vinyl hydroxy silicone oil;

the viscosity of the hydroxyl silicone oil at 25 ℃ is 30-55 mm ^2/ s, hydroxyl content is 3-6 wt%;

the viscosity of the vinyl hydroxyl silicone oil at 25 ℃ is 5-20 cs, the hydroxyl content is 1.5-7 wt%, and the vinyl content is 0.05-1 wt%.

8. The tear-resistant silica gel leather of claim 1, wherein the functional auxiliary agent is at least one selected from stearic acid, palmitic acid, oleic acid, calcium stearate, zinc stearate, microcrystalline paraffin wax, polyethylene wax and magnesium stearate.

9. A method for preparing the tear-resistant silicone leather according to any one of claims 1 to 8, comprising the steps of:

S2, extruding the material obtained in the S1 by adopting a four-roll calender, and paving a grain film at the bottom;

10. Use of a tear-resistant silicone leather according to any one of claims 1 to 8, in the fields of car interiors, clothing wear, ground traffic, aviation and navigation, indoor and outdoor, medical entertainment, childhood education.