CN115895268B - Tear-resistant silica gel leather and preparation process and application thereof - Google Patents

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

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CN115895268B
CN115895268B CN202210838224.4A CN202210838224A CN115895268B CN 115895268 B CN115895268 B CN 115895268B CN 202210838224 A CN202210838224 A CN 202210838224A CN 115895268 B CN115895268 B CN 115895268B
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silica gel
leather
tear
hydroxyl
silicone oil
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CN115895268A (en
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薛志勇
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Jiangmen Aozhuo Industrial Co ltd
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Jiangmen Aozhuo Industrial Co ltd
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Abstract

The application discloses tear-resistant silica gel leather, which is prepared by mixing crude silica gel, inorganic filler, polysiloxane, functional auxiliary agent and surface modifier, and then the silica gel leather prepared by a specific leather preparation process has excellent weather resistance, acid and alkali resistance, flame retardance, wear resistance and tear resistance. In addition, the platinum vulcanization system is selected, so that the method has the advantages of no solvent, good environmental protection and no generation of a large amount of waste gas. The system is solid silica gel, in particular long-chain-level silica gel, is easy to dope substances, has good inclusion, achieves flame retardance, and has tear strength to reach the level of the highest-grade solid silica gel.

Description

Tear-resistant silica gel leather and preparation process and application thereof
Technical Field
The application relates to the field of preparation of high molecular silicon materials, and in particular relates to a tear-resistant silica gel leather, a preparation process and application thereof, wherein D06N3/00 is formed by the steps of preparing the tear-resistant silica gel leather.
Background
The natural leather has good hand feeling, good air permeability, flame retardance, durability and durability, good tearing strength, but poor corrosion resistance and color fastness, and the waste is difficult to treat and has special smell. The odor and corrosion resistance of the polymer silicon material synthetic leather can be improved. The high molecular silicon material is a novel environment-friendly material, is odorless and nontoxic, and has excellent weather resistance, electrical insulation, oxygen resistance, aging resistance, light resistance, aging resistance, mildew resistance and chemical stability. The food-grade silicon material can be used as an article which is in direct contact with human bodies, such as infant articles, kitchen ware, car interior trim and the like. But the abrasion resistance and tear strength of the liquid silica gel are poor. The solid silica gel has excellent acid and alkali resistance, weather resistance, ultraviolet resistance and high and low temperature resistance, but does not have flame retardance. Along 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, when the content of the inorganic flame retardants is too high, the tear resistance of the synthetic leather is poor, and the synthetic leather has poor compatibility with a system, so that the flame retardant effect of the synthetic leather is improved undesirably. Therefore, the synthetic leather of the high molecular silicon material with excellent tearing resistance and strong flame retardance in the first synthesis has important significance in multiple fields.
Patent CN201711112962.6 discloses a preparation method of a silicone rubber composite molding material, which is obtained by mixing and vulcanizing methyl vinyl silicone rubber, white carbon black by a gas phase method, white carbon black by a precipitation method, hydroxyl silicone oil, active aluminum hydroxide, zinc stearate, iron oxide red, cerium oxide and a bis-penta vulcanizing agent, wherein the mechanical strength of the silicone rubber composite molding material is high, and the silicone rubber composite molding material also has excellent electrical property, flame retardance and outdoor aging resistance, but the tearing strength of the silicone rubber composite molding material needs to be further improved.
Disclosure of Invention
In order to solve the above problems, a first aspect of the present application provides a tear-resistant silica gel leather, which is prepared from the following raw materials: 85-120 parts of crude silicone rubber, 40-120 parts of inorganic filler, 5-15 parts of polysiloxane, 0.05-1 part of functional auxiliary agent and 0.1-2 parts of surface modifier.
In some preferred embodiments, the silicone gum is selected from at least one of phenyl silicone gum, methyl vinyl silicone gum, methyl phenyl vinyl silicone gum, linear polydimethylsiloxane, fluorosilicone gum; preferably, the raw silicone rubber is methyl vinyl raw silicone rubber; further preferably, the methyl vinyl silicone gum comprises a first methyl vinyl silicone gum and a second methyl vinyl silicone gum.
In some preferred embodiments, the mass ratio of the first methylvinylsil raw rubber to the second methylvinylsil 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 methylvinylsilastic has an average molecular weight of 40 to 90 tens of thousands and a vinyl content of 0.03 to 0.5wt%; preferably, the average molecular weight of the methyl vinyl silicone 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 tens of thousands and a vinyl content of 0.02 to 0.1wt%; preferably, the average molecular weight of the second vinyl silicone 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 black and aluminum hydroxide.
In some preferred embodiments, the weight ratio of the white carbon black to the aluminum hydroxide is (10 to 20): (60-75); preferably, the weight ratio of the white carbon black to the aluminum hydroxide is 16:70.
in some preferred embodiments, the white carbon black is selected from at least one of precipitated white carbon black and fumed white carbon black; preferably, the white carbon black is vapor phase white carbon black.
In some preferred embodiments, the specific surface area of the fumed silica is 150-275 m 2 The screen residue of the sieve with the thickness of 45 mu m 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 The screen residue of the sieve with the thickness of 45 mu m is less than or equal to 250mg/kg, and the pH value of the suspension is 3.7-4.5; further preferably, the specific surface area of the fumed silica is 185.25m 2 Per g,45 μm screen residue < 250mg/kg, pH of the suspension is 4.2.
In some preferred embodiments, the aluminum hydroxide has a particle size of 10 to 30 μm, siO 2 The content of (2) is less than 0.1wt%, fe 2 O 3 The content of (2) is less than 0.08wt percent, and the whiteness is more than 92 percent; preferably, the granularity of the aluminum hydroxide is 10-20 mu m, siO 2 The content of (C) is less than 0.04wt percent, fe 2 O 3 The content of (C) is less than 0.03wt%, and the whiteness is more than95; further preferably, the aluminum hydroxide has a particle size of 14 μm, siO 2 The content of Fe is 0.03wt% 2 O 3 The content of (3) was 0.009wt% and the whiteness was 96.
The molecular chains of the silicone rubber are relatively flexible, the acting force between the chains is weak, and the inventor 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 silicone material, and particularly the inorganic filler is white carbon black and aluminum hydroxide, which is more beneficial to improving the tearing strength and enhancing the flame retardant property. Presumably, the reason is that the synergistic effect of the fumed silica with a certain particle size and the aluminum hydroxide can increase the shearing force and the fluidity of inorganic filler particles during the mixing of the silica gel, so that the dispersibility of the filler particles is further increased, and active groups on the surface of the fumed silica can be physically or chemically combined with 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 realized. The inventors have unexpectedly found that when the weight ratio of the white carbon black to the aluminum hydroxide is (10 to 20): and (60-75), the product can further improve the tearing strength, the tensile strength, the flame retardance and the wear resistance, reduce the shrinkage of the silica gel leather product and has no influence on the texture and the shape of the final product.
In some preferred embodiments, the polysiloxane is selected from at least one of amino silicone oil, hydroxyl silicone oil, carboxyl silicone oil, dihydroxysilicone oil, hydrogen-containing silicone oil, vinyl fluorine-containing silicone oil, vinyl hydroxyl silicone oil, perfluoropolyether silicone oil; preferably, the polysiloxane is hydroxy silicone oil and vinyl hydroxy silicone oil.
In some preferred embodiments, the weight ratio of the hydroxyl silicone oil to the vinyl hydroxyl silicone oil is (3-7): (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 DEG C 2/ s, the hydroxyl content is 3-6%; preferably, the viscosity of the hydroxyl silicone oil at 25 ℃ is 38-45 mm 2 And/s, the hydroxyl 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 viscosity of the vinyl hydroxyl silicone oil at 25 ℃ is 12cs, the hydroxyl content is 4wt%, and the vinyl content is 0.1wt%.
The inorganic filler has poor compatibility with the silica gel system, and excessive addition can lead to reduced tearing strength of the silica gel leather. The inventor adds polysiloxane into the system, especially the 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 possible reasons are presumed to be that the viscosity of the hydroxyl silicone oil and the vinyl hydroxyl silicone oil is proper, the specific molecular structure and active groups can reduce the surface tension among components in the system, increase the acting force among weak molecules, further enhance the dispersibility and the fluidity of the filler in the system, enhance the flame retardant property in the system, and the vinyl active bond in the vinyl hydroxyl silicone oil can react with the active groups of the inorganic filler to play a role in controlling the structure, and simultaneously generate a crosslinking reaction with the groups in the raw rubber, thereby further increasing the structural stability and the tearing strength of the silica gel leather.
The inventors have unexpectedly found that when the weight ratio of the hydroxyl silicone oil to the vinyl hydroxyl silicone oil is (3 to 7): (1-5), the specific hydroxyl content and vinyl content are synergistic with other components in the system, 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 is up to 46KN/m.
In some preferred embodiments, the functional auxiliary is selected from at least one of stearic acid, palmitic acid, oleic acid, calcium stearate, zinc stearate, microcrystalline wax, polyethylene wax, magnesium stearate; preferably, the release agent is zinc salt of octadecanoic acid.
In some preferred embodiments, the zinc salt of octadecanoic acid is selected from at least one of zinc salt of octadecanoic acid in powder form, zinc salt of octadecanoic acid in paste form; preferably, the zinc salt of octadecanoic acid is a paste zinc salt of octadecanoic acid; further preferably, the paste zinc salt of octadecanoic acid has an average molecular weight of 40 to 80 ten thousand; still more preferably, the paste 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 can enhance the effect of the filler and also cause problems such as difficulty in demolding during molding. The functional auxiliary agent, especially the zinc salt of octadecanoic acid, can obviously improve the problem of demolding. However, too much zinc stearate causes a decrease in hardness and tear strength. The inventor finds that the paste zinc octadecanoate salt with the average molecular weight of 60 ten thousand is added into the system, and the paste zinc octadecanoate salt and the surface modifier and other components in the system are synergistic, so that the excellent demolding effect of the paste zinc octadecanoate salt can be ensured, the rebound resilience of leather can be increased, and more importantly, the adhesive strength between cloth and vulcanized high polymer silicon material can be increased in the later corona treatment process, the use of glue is avoided, and the environmental protection performance is improved.
In some preferred embodiments, the surface modifier is selected from the group consisting of aminopropyl triethoxysilane, gamma-glycidoxypropyl trimethoxysilane, aminopropyl triethoxysilane, gamma-aminopropyl trimethoxysilane, vinyl trimethoxysilane, butyl titanate, bis (triethoxypropyl) tetrasulfide, 3-aminopropyl triethoxysilane; preferably, the surface modifier is vinyltrimethoxysilane (available from us doucornin).
The second aspect of the application provides a method for preparing tear-resistant silica gel leather, which comprises the following steps:
s1, weighing preparation raw materials according to a proportion, heating, reacting, putting into a kneader, discharging, filtering to obtain a high molecular silicon material, and vulcanizing.
S2, extruding the material obtained in the step S1 by adopting a four-roll calender, and paving a grain film at the bottom;
s3, carrying out corona treatment on the cloth by utilizing plasma, and attaching the cloth to the surface of silica gel;
s4, conveying the primary formed leather obtained in the step S3 into a drying tunnel, and performing heating and drying treatment;
s5, natural cooling is realized through cooling water under the action of pulling force by a three-roller machine, and then stripping and winding are carried out;
s6, conveying the obtained leather into a coating production line, coating the surface with a wear-resistant coating, and conveying the leather into a drying tunnel for drying.
In some preferred embodiments, the specific preparation operation of the high molecular silicon material in S1 is as follows: and (3) putting the crude silicone rubber, the silicone oil, the release agent and the surface modifier into a kneader, heating to 130 ℃, stirring for 1h, then putting the inorganic filler into the kneader evenly, vacuumizing for 70-100 min after agglomeration, discharging, and filtering by a filter with a 100-300 mesh filter screen to obtain the high polymer silicon material.
In some preferred embodiments, the specific operation of vulcanization in S1 is: mixing the high molecular 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 extruded mixture through a vulcanizing machine to obtain the high molecular silicon material.
In some preferred embodiments, the weight ratio of the polymeric silicon material to the vulcanizing agent is (130-140): 1, a step of; 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-butylperoxy silane, dicumyl peroxide; preferably, the vulcanizing agent is a platinum vulcanizing agent.
In some preferred embodiments, the vulcanization temperature is 120 to 150 ℃ for a period of 5 to 15 minutes; preferably, the vulcanization temperature is 140 ℃ and the time is 10min.
In some preferred embodiments, the textured film in S2 is at least one selected from PP textured film, PET transfer textured film, textured paper, HTR textured film; preferably, the step S2 is performed by using a PP textured film; further preferably, the bearable temperature of the PP grain film in the step S2 is 110-120 ℃; still further preferably, the sustainable 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 corona treatment has a dyne value of 50 to 55; preferably, the corona treatment has a dyne value of 52.
In some preferred embodiments, the speed of the corona treatment in S3 is the same as the transport speed of the material obtained in S2; preferably, the speed of the corona treatment in the step S3 is 3-8 m/min, and further preferably, the speed of the corona treatment in the step 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 cloth in S3 is at least one selected from a knitted fabric, a woven fabric and a non-woven fabric.
In some preferred embodiments, the bottom temperature of the drying tunnel in the step S4 is 100-130 ℃ and the top temperature is 140-160 ℃; the bottom temperature of the drying tunnel in the step S4 is 120 ℃, and the top temperature is 150 ℃.
In some preferred embodiments, the time of the heating and drying treatment in S4 is 10-30 min; preferably, the time of the heating and drying treatment in S4 is 15min.
In some preferred embodiments, the temperature of the drying tunnel in the step S6 is 150-180 ℃ and the time is 5-15 min; preferably, the drying temperature in 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 polytetrafluoroethylene wear-resistant layer, organosilicon wear-resistant layer and polyvinyl acid ester; preferably, the abrasion-resistant layer in S6 is an organosilicon abrasion-resistant layer.
The third aspect of the application provides application of the tear-resistant silica gel leather, which is used in the fields of vehicle interior decoration, clothing wear, ground traffic, aviation navigation, indoor and outdoor, medical entertainment and children education.
Compared with the prior art, the application has the following beneficial effects:
(1) The high molecular silicon material is prepared by mixing the crude silicon rubber, the inorganic filler, the polysiloxane, the functional auxiliary agent and the surface modifier, and the silica gel leather prepared by utilizing a specific leather preparation process has excellent weather resistance, acid and alkali resistance, flame retardance, wear resistance and tear resistance, and has wide application prospects in various fields of automobile interiors, clothing wear, ground traffic, aviation navigation, indoor and outdoor, medical entertainment, children education and the like, and is especially used for automobile interiors.
(2) The system is solid silica gel, particularly long-chain-level silica gel, is easy to dope substances, has good inclusion, achieves flame retardance, has tear strength, can reach the level of the highest-grade solid silica gel, has small shrinkage rate of about 3%, and has no obvious influence on lines and shapes.
(3) According to the application, a platinum vulcanization system is selected to carry out vulcanization on the high molecular silicon material to prepare the silica gel leather, so that the silica gel leather is solvent-free, good in environmental protection and free from a large amount of waste gas;
(4) The high molecular 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 by the synergistic effect of corona treatment and the components in 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 shows the results of the antibacterial property test of the sample obtained in example 1.
FIG. 3 shows the results of antistatic property test of the sample obtained in example 1.
Detailed Description
Example 1
1. The tear-resistant silica gel leather comprises the following preparation raw materials: 100 parts of crude silicone rubber, 86 parts of inorganic filler, 8 parts of polysiloxane, 0.3 part of functional auxiliary agent and 0.5 part of surface modifier.
The raw silicone rubber is methyl vinyl raw silicone rubber.
The methyl vinyl silicone rubber comprises a first methyl vinyl silicone rubber and a second methyl vinyl silicone rubber, wherein the mass ratio of the first methyl vinyl silicone rubber to the second methyl vinyl silicone rubber is 3:7.
the average molecular weight of the first methyl vinyl silicone rubber is 45-85 ten thousand, and the vinyl content is 0.13-0.18 wt% (Zhejiang silicon industry Co., ltd., model: 110-2).
The average molecular weight of the second vinyl silicone rubber is 45-85 ten thousand, the vinyl content is 0.03-0.06 wt% (Zhejiang silicon industry Co., ltd., model: 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 gas phase white carbon black.
The specific surface area of the fumed silica is 185.25m 2 Per g,45 μm screen residue < 250mg/kg, pH of the suspension was 4.2 (available from Zhejiang silicon Co., ltd., model: HS-200).
The granularity of the aluminum hydroxide is 14 mu m, siO 2 The content of Fe is 0.03wt% 2 O 3 The content of (C) was 0.009wt% and the whiteness was 96 (model: 8258, available from North aluminum Co., ltd., zhengzhou).
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 And/s, the hydroxyl content is 3.6-4.5 wt% (model 203D of tin-free full-standing technology Co., ltd.).
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 Australia of Jiangmen Co., ltd., model: 203BF 11).
The release agent is zinc octadecanoate.
The zinc salt of the octadecanoic acid is paste zinc salt of the octadecanoic acid; the paste zinc salt of octadecanoic acid has an average molecular weight of 60 ten thousand (from Australian Utility Co., ltd., model number of CO).
The surface modifier is vinyltrimethoxysilane (available from us doukaning).
2. A preparation method of tear-resistant silica gel leather comprises the following steps:
s1, weighing preparation raw materials according to a proportion, heating, reacting, putting into a kneader, discharging, filtering to obtain a high molecular silicon material, and vulcanizing.
S2, extruding the material obtained in the step S1 by adopting a four-roll calender, and paving a grain film at the bottom;
s3, carrying out corona treatment on the cloth by utilizing plasma, and attaching the cloth to the surface of silica gel;
s4, conveying the primary formed leather obtained in the step S3 into a drying tunnel, and performing heating and drying treatment;
s5, natural cooling is realized through cooling water under the action of pulling force by a three-roller machine, and then stripping and winding are carried out;
s6, conveying the obtained leather into a coating production line, coating the surface with a wear-resistant coating, and conveying the leather into a drying tunnel for drying.
The specific preparation operation of the high molecular silicon material in the S1 comprises the following steps: and (3) putting the crude silicone rubber, the silicone oil, the release agent and the surface modifier into a kneader, heating to 130 ℃, stirring for 1h, then putting the inorganic filler into the kneader evenly, vacuumizing for 80min after agglomeration, discharging, and filtering by a filter with a 200-mesh filter screen to obtain the high polymer silicon material.
The specific operation of vulcanization in the step S1 is as follows: mixing the high molecular 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 extruded 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 (model: A168, which is purchased from Australian Utility Co., ltd., jiangmen).
The vulcanization temperature is 140 ℃ and the time is 10min.
The PP grain film is the grain film in the S2; the acceptable temperature of the PP textured film in S2 is 120 ℃ (purchased from Ming Fei technology Co., spring).
And (3) performing corona treatment in the step (S3) to obtain ceramic plasma corona treatment.
The corona treated dyne value was 52.
The speed of corona treatment in the step S3 is the same as the transmission speed of the material obtained in the step S2; the speed of the corona treatment in the step S3 is 5m/min.
The timeliness of the corona treatment in the step S3 and the material obtained in the step S2 is 15S.
The cloth in the S3 is selected from knitted cloth.
The bottom temperature of the drying tunnel in the step S4 is 120 ℃, and the top temperature is 150 ℃.
And (4) heating and drying for 15min.
And in the step S6, the drying temperature of the drying tunnel is 165 ℃ and the drying time is 10min.
And the abrasion-resistant layer in the step S6 is an organosilicon abrasion-resistant layer.
3. The utility model provides an application of anti tearing silica gel leather, it is used for car interior trim, dress, ground traffic, aviation navigation, indoor outdoor, medical amusement, children education field.
Example 2
1. The tear resistant silica gel leather differs from example 1 in that:
the preparation raw materials comprise: 100 parts of crude silicone rubber, 90 parts of inorganic filler, 10 parts of polysiloxane, 0.4 part of functional auxiliary agent and 0.5 part of surface modifier.
2. A method for preparing tear-resistant silica gel leather, which is the same as in example 1.
3. An application of tear-resistant silica gel leather is the same as in example 1.
Comparative example 1
1. The tear resistant silica gel leather differs from example 1 in that:
the weight ratio of the white carbon black to the aluminum hydroxide is 5:70.
2. a method for preparing tear-resistant silica gel leather, which is the same as in example 1.
3. An application of tear-resistant silica gel leather is the same as in example 1.
Comparative example 2
1. The tear resistant silica gel leather differs from example 1 in that:
the viscosity of the vinyl hydroxyl silicone oil at 25 ℃ is less than or equal to 33mm 2 And/s, hydroxyl content of 6.+ -. 0.5wt% and vinyl content of 6.+ -. 0.5wt% (from Lv Bining chemical technology Co., ltd.).
2. A method for preparing tear-resistant silica gel leather, which is the same as in example 1.
3. An application of tear-resistant silica gel leather is the same as in example 1.
Comparative example 3
1. The tear resistant silica gel leather differs from example 1 in that:
the release agent is zinc octadecanoate (CAS number: 557-05-1).
2. A method for preparing tear-resistant silica gel leather, which is the same as in example 1.
3. An application of tear-resistant silica gel leather is the same as in example 1.
Performance testing
1. The samples obtained in example 1 were tested and the results are shown in Table 1.
TABLE 1 results of sample Performance test 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 commercial common samples are shown in FIG. 1.
3. Antibacterial properties: the experiment of the colibacillus on the performance inhibition zone of the sample obtained in the example 1 is selected, other silica gel leather in the market is selected as a comparison example, and the result is shown in figure 2.
According to the test result, the silica gel leather obtained in the embodiment 1 of the application can effectively control bacterial growth on the surface of the fabric through antibacterial property, prevent mould and mildew, and reduce bacteria and peculiar smell by 99.9%.
4. Antistatic test: the test pieces obtained in example 1 were tested by triboelectric charging voltage method. The test sample (4 blocks, 2 warps, 2 wefts, size 4 cm multiplied by 8 cm) is clamped on a rotary drum, the rotary drum rubs with standard cloth (nylon or polypropylene) at a rotating speed of 400r/min, and the maximum value (V) of the charging voltage of the test sample within 1min is tested. The national standard of reference is: GJB3007-97.
According to the test result, the silica gel leather obtained in the embodiment 1 of the application can reduce the static electricity generated by friction of the in-out automobile to 50%, has durable functions and has the same service life as the whole automobile.
5. The samples obtained in examples and comparative examples were tested for tensile strength, elongation, tear strength, shrinkage, rebound resilience, and combustion characteristics by the methods described in table 1, and the structures are shown in table 2.
Table 2 results of sample performance tests obtained for 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
Shrinkage (%) 3.2 3.1 4.5 2.8 4.2
Combustion characteristics (grade) A A B C C
The tensile strength and the tearing strength determine the quality of the silica gel leather, and are particularly important to the pinhole performance of leather sewing, so the tensile strength of the silica gel is more than 9.5MPa, the tearing strength is more than 46N/mm, important indexes for leather safety are combustion characteristics, at least the grade A is achieved, and the product obtained in the embodiment 1 has the best performance as can be seen from the table 2.

Claims (3)

1. The tear-resistant silica gel leather is characterized by comprising the following preparation raw materials: 85-120 parts of crude silicone rubber, 40-120 parts of inorganic filler, 5-15 parts of polysiloxane, 0.05-1 part of functional auxiliary agent and 0.1-2 parts of surface modifier;
the functional auxiliary agent is selected from zinc octadecanoate;
the zinc salt of the octadecanoic acid is paste zinc salt of the octadecanoic acid; the average molecular weight of the paste zinc octadecanoate salt is 40-80 ten thousand;
the inorganic filler is fumed silica and aluminum hydroxide;
the weight ratio of the fumed silica to the aluminum hydroxide is (10-20): (60-75); the specific surface area of the white carbon black by the gas phase method is 185-225 m 2 The screen residue of the sieve with the thickness of 45 mu m is less than or equal to 250mg/kg, and the pH value of the suspension is 3.7-4.5; the granularity of the aluminum hydroxide is 10-30 mu m, siO 2 The content of (2) is less than 0.1wt%, fe 2 O 3 The content of (2) is less than 0.08wt percent, and the whiteness is more than 92 percent;
the raw silicone rubber is methyl vinyl raw silicone rubber;
the methyl vinyl silicone gum comprises a first methyl vinyl silicone gum and a second methyl vinyl silicone gum;
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);
the polysiloxane is hydroxyl silicone oil and vinyl hydroxyl silicone oil;
the viscosity of the hydroxyl silicone oil at 25 ℃ is 30-55 mm 2/ s, the hydroxyl content is 3-6wt%;
the viscosity of the vinyl hydroxyl silicone oil at 25 ℃ is 5-20 cs, the hydroxyl content is 1.5-7wt% and the vinyl content is 0.05-1wt%.
2. A method of preparing a tear resistant silica gel leather according to claim 1, comprising the steps of:
s1, weighing preparation raw materials according to a proportion, heating, reacting, putting into a kneader, discharging, filtering to obtain a high molecular silicon material, and vulcanizing;
s2, extruding the material obtained in the step S1 by adopting a four-roller calender, and paving a grain film at the bottom;
s3, carrying out corona treatment on the cloth by utilizing plasma, and attaching the cloth to the surface of silica gel;
s4, conveying the primary formed leather obtained in the step S3 into a drying tunnel, and performing heating and drying treatment;
s5, natural cooling is realized through cooling water under the action of pulling force by a three-roller machine, and then stripping and winding are carried out;
s6, conveying the obtained leather into a coating production line, coating the surface with a wear-resistant coating, and conveying the leather into a drying tunnel for drying.
3. Use of the tear resistant silica gel leather according to claim 1 for automotive interiors, apparel wear, ground traffic, aerospace navigation, indoor and outdoor, medical entertainment, child education.
CN202210838224.4A 2022-07-14 2022-07-14 Tear-resistant silica gel leather and preparation process and application thereof Active CN115895268B (en)

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