阅读说明：本技术 抗磨硅橡胶组合物及其制备方法与应用 (Wear-resistant silicone rubber composition and preparation method and application thereof ) 是由 李士成 童蓉 杨丽芳 胡秋波 岳风树 于 2020-07-28 设计创作，主要内容包括：本申请提供了一种抗磨硅橡胶组合物,以所述抗磨硅橡胶组合物的总重量为100％计,包括如下重量百分含量的下列组分：51～93.8％硅氧烷聚合物；5～25％填料；0.5～10％抗磨添加剂；0.5～8％结构控制剂；0.1～3％交联剂；0.1～3％助剂。本申请提供的抗磨硅橡胶组合物,以硅氧烷聚合物为主要原料,在交联剂的作用下,硅氧烷聚合物发生交联反应形成交联网格结构,协同填料和抗磨添加剂,可增强硅氧烷聚合物形成的网格结构的强度,并能降低抗磨硅橡胶组合物的摩擦系数、提高抗磨硅橡胶组合物的抗磨性能,进一步通过复配其他组分,使抗磨硅橡胶组合物能达到稳定的性能和较强的抗磨能力,应用更加广泛。(The application provides an anti-wear silicone rubber composition, which comprises the following components in percentage by weight based on the total weight of the anti-wear silicone rubber composition as 100 percent: 51-93.8% of a siloxane polymer; 5-25% of a filler; 0.5-10% of an antiwear additive; 0.5-8% of a structure control agent; 0.1-3% of a cross-linking agent; 0.1-3% of an auxiliary agent. According to the wear-resistant silicone rubber composition provided by the application, a silicone polymer is taken as a main raw material, the silicone polymer is subjected to a crosslinking reaction under the action of a crosslinking agent to form a crosslinked grid structure, and the filler and the wear-resistant additive are cooperated, so that the strength of the grid structure formed by the silicone polymer can be enhanced, the friction coefficient of the wear-resistant silicone rubber composition can be reduced, the wear resistance of the wear-resistant silicone rubber composition is improved, and further, the wear-resistant silicone rubber composition can achieve stable performance and strong wear resistance through compounding of other components, so that the wear-resistant silicone rubber composition is more widely applied.)

1. An anti-wear silicone rubber composition is characterized by comprising the following components in percentage by weight based on 100 percent of the total weight of the anti-wear silicone rubber composition:

2. the anti-abrasion silicone rubber composition according to claim 1, wherein the silicone polymer is selected from silicone polymers containing vinyl crosslinking reactive groups, and the vinyl groups are present in a molar percentage of 0.10 to 5.0 mol%.

3. The anti-abrasion silicone rubber composition according to claim 2, wherein said silicone polymer containing vinyl crosslinking reactive groups is selected from at least one of vinyl polydimethylsiloxane, vinyl polyphenylmethylsiloxane, and vinyl polyfluorosiloxane.

4. The anti-wear silicone rubber composition according to any one of claims 1 to 3, wherein the anti-wear additive is selected from PTFE powder, MoS₂Powder, WS₂At least one of a powder, a graphite powder, a zirconium phosphate powder, and a BN powder.

5. The anti-wear silicone rubber composition according to claim 4, wherein the anti-wear additive is selected from modified anti-wear additives obtained by treatment with a surfactant, wherein the surfactant is selected from at least one of aminopropyltrimethoxysilane, dimethyldimethoxysilane, vinyltrimethoxysilane, hexamethyldisilazane.

6. The anti-abrasion silicone rubber composition according to any one of claims 1 to 3, wherein the filler is at least one selected from nano silica and silicone resin; and/or the presence of a gas in the gas,

the structure control agent is selected from at least one of hydroxyl silane compounds, alkoxy siloxane compounds, silazane compounds and boron-containing siloxane compounds; and/or the presence of a gas in the gas,

the cross-linking agent is selected from at least one of 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexane and 2, 4-dichloro benzoyl peroxide; and/or the presence of a gas in the gas,

the auxiliary agent is at least one of cerium oxide, zinc oxide and zinc stearate.

7. A preparation method of an anti-wear silicone rubber composition is characterized by comprising the following steps:

weighing the components according to the formula of the anti-wear silicone rubber composition of any one of claims 1 to 6;

mixing the siloxane polymer, the filler, the antiwear additive, the structure control agent and the auxiliary agent to perform a first mixing treatment to obtain a first mixture;

carrying out second mixing treatment on the first mixture to obtain a second mixture;

performing third mixing treatment on the second mixture to obtain silicone rubber base rubber;

mixing the silicone rubber base rubber and the cross-linking agent, and then carrying out first vulcanization treatment to obtain a first silicone rubber mixture;

and carrying out second vulcanization treatment on the first silicone rubber mixture to obtain the anti-wear silicone rubber composition.

8. The method for preparing an anti-abrasion silicone rubber composition according to claim 7,

mixing the siloxane polymer, the filler, the antiwear additive, the structure control agent and the auxiliary agent for a first mixing treatment, and then mixing and treating the siloxane polymer, the filler, the antiwear additive, the structure control agent and the auxiliary agent for 4-4.5 hours at the temperature of 20-30 ℃; and/or the presence of a gas in the gas,

in the step of performing second mixing treatment on the first mixture, mixing the first mixture at the temperature of 150-160 ℃ for 2-2.5 hours; and/or the presence of a gas in the gas,

in the step of performing third mixing treatment on the second mixture, mixing the second mixture for 1-1.5 hours under a vacuum condition; and/or the presence of a gas in the gas,

mixing the silicone rubber base rubber and the crosslinking agent and then carrying out first vulcanization treatment, wherein the silicone rubber base rubber and the crosslinking agent are mixed and then vulcanized for 10-15 minutes at 165-170 ℃; and/or the presence of a gas in the gas,

and in the step of carrying out second vulcanization treatment on the first silicone rubber mixture, vulcanizing the first silicone rubber mixture for 4-4.5 hours at the temperature of 200-220 ℃.

9. The method of preparing an anti-wear silicone rubber composition according to claim 7, further comprising: and (2) carrying out modification treatment on the antiwear additive by adopting a surfactant, wherein the modification treatment comprises the following steps:

mixing the surfactant and an organic solvent aqueous solution to obtain a modified solution, wherein the solute mass percent concentration of the modified solution is 10-15%;

mixing the antiwear additive and the modification liquid to obtain a first treatment liquid;

carrying out constant-temperature mixing treatment on the first treatment liquid to obtain a first material;

and drying and grinding the first material to obtain the modified antiwear additive.

10. A sealing product, which is characterized by comprising an anti-wear silicone rubber composition, wherein the anti-wear silicone rubber composition is the anti-wear silicone rubber composition of any one of claims 1 to 6 or is prepared by the preparation method of the anti-wear silicone rubber composition of any one of claims 7 to 9.

Technical Field

The application belongs to the technical field of organic polymers, and particularly relates to an anti-wear silicone rubber composition, and a preparation method and application thereof.

Background

Silicone rubber refers to rubber having a backbone composed of alternating silicon and oxygen atoms, with the silicon atoms typically having two organic groups attached to them. Conventional silicone rubbers consist predominantly of siloxane segments containing methyl groups and small amounts of vinyl groups. The introduction of phenyl can improve the high and low temperature resistance of the silicone rubber, and the introduction of trifluoropropyl and cyano can improve the temperature resistance and oil resistance of the silicone rubber. The silicon rubber has good low-temperature resistance and can still work at the temperature of minus 55 ℃. After the introduction of phenyl, a temperature of-73 ℃ can be reached. The silicon rubber has outstanding heat resistance, can work for a long time at 180 ℃, can still have elasticity for a plurality of weeks or more even at the temperature slightly higher than 200 ℃, and can instantaneously resist the high temperature of more than 300 ℃. Silicone rubber has good gas permeability, and oxygen transmission rate is the highest among synthetic polymers. In addition, the silicon rubber also has the outstanding characteristics of physiological inertia and no coagulation, so the silicon rubber is widely applied in the medical field.

The silicone rubber has excellent performance and mainly has the following properties: (1) excellent high-temperature performance: the silicon rubber is characterized by high-temperature stability, certain flexibility, rebound resilience and surface hardness can be still maintained in the silicon rubber under the high-temperature environment of more than 200 ℃, and the mechanical property is not obviously changed; (2) excellent low-temperature performance: the glass transition temperature of the silicon rubber is generally-70 to-50 ℃, and the special formula can reach-100 ℃, which shows that the silicon rubber has excellent low-temperature performance and has great significance for aviation and aerospace industries; (3) excellent weather resistance: under the condition of not adding any additive, Si-O-Si bonds in the silicon rubber are very stable to oxygen, ozone, ultraviolet rays and the like; (4) the electrical properties are excellent: the silicon rubber has excellent insulating property, and the corona resistance and the arc resistance are also very good; (5) excellent physical and mechanical properties: the physical and mechanical properties of the silicone rubber are superior to those of general purpose rubber at a high temperature of 150 ℃ and a low temperature of-50 ℃. (6) Excellent oil resistance and chemical reagent resistance: ordinary silicone rubber has moderate oil and solvent resistance. (7) Excellent gas permeability: the air permeability of the silicon rubber to air, nitrogen, oxygen, carbon dioxide and other gases at room temperature is 30-50 times higher than that of the natural rubber. (8) Is physiologically inert. The silicone rubber is non-toxic, tasteless and odorless, does not adhere to human tissues, has an anticoagulation effect, and has very little reactivity to the human tissues.

The silicon rubber based on the excellent performance is more and more widely applied to the field of medical appliances and sealing fields, but the silicon rubber material has weak abrasion resistance, is not beneficial to being used in dynamic sealing devices, and inhibits the wide application of the silicon rubber.

Disclosure of Invention

The application aims to provide an anti-wear silicone rubber composition and a preparation method thereof, and aims to solve the problem of poor anti-wear capability of silicone rubber in the prior art.

In order to achieve the purpose of the application, the technical scheme adopted by the application is as follows:

in a first aspect, the present application provides an anti-wear silicone rubber composition, comprising the following components in percentage by weight, based on the total weight of the anti-wear silicone rubber composition taken as 100%:

in a second aspect, the present application provides a method for preparing an anti-wear silicone rubber composition, comprising the steps of:

weighing the components according to the formula of the wear-resistant silicone rubber composition;

mixing the siloxane polymer, the filler, the antiwear additive, the structure control agent and the auxiliary agent, and then carrying out first mixing treatment to obtain a first mixture;

carrying out second mixing treatment on the first mixture to obtain a second mixture;

performing third mixing treatment on the second mixture to obtain silicone rubber base rubber;

mixing the silicone rubber base rubber and the cross-linking agent, and then carrying out first vulcanization treatment to obtain a first silicone rubber mixture;

and carrying out second vulcanization treatment on the first silicone rubber mixture to obtain the anti-wear silicone rubber composition.

In a third aspect, the present application provides a sealing product, which comprises an anti-wear silicone rubber composition, wherein the anti-wear silicone rubber composition of the anti-wear silicone rubber composition or prepared by the preparation method of the anti-wear silicone rubber composition.

The anti-wear silicone rubber composition provided by the first aspect of the application takes a siloxane polymer as a main raw material, wherein the siloxane polymer is a polymer with a main chain structure formed by Si-O-Si bonds and provides a basic cross-linked grid structure; under the action of the cross-linking agent, the siloxane polymer, the filler and the anti-wear additive are subjected to cross-linking reaction, and the three have synergistic action, so that on one hand, a cross-linked grid structure formed by the siloxane polymer can be filled, the strength of the grid structure is further enhanced, on the other hand, the friction coefficient of the anti-wear silicone rubber composition can be reduced, and meanwhile, the anti-wear performance of the anti-wear silicone rubber composition is improved; meanwhile, the structure control agent is cooperated, and the flowability and the processing performance of the anti-wear silicone rubber composition are ensured by utilizing the chemical affinity of the structure control agent reinforced filler and the anti-wear additive with the siloxane polymer; and furthermore, by compounding the auxiliary agent with a specific weight percentage content ratio, the performance of the wear-resistant silicone rubber composition is improved, so that the wear-resistant silicone rubber composition can achieve stable performance and stronger wear resistance, and the application is wider.

According to the preparation method of the wear-resistant silicone rubber composition provided by the second aspect of the application, each component substance is subjected to three times of mixing treatment under different conditions, and then is subjected to two times of vulcanization treatment under different conditions to prepare the wear-resistant silicone rubber composition.

According to the sealing product provided by the third aspect of the application, because the sealing product comprises the anti-wear silicone rubber composition, and the anti-wear silicone rubber composition of the anti-wear silicone rubber composition or the sealing product prepared by the preparation method of the anti-wear silicone rubber composition, the sealing product has higher product strength and stronger anti-wear capability, and can be widely applied.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application more clearly apparent, the present application is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In this application, the term "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a is present alone, A and B are present simultaneously, and B is present alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, "at least one (a), b, or c", or "at least one (a), b, and c", may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, and c may be single or plural, respectively.

It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, some or all of the steps may be executed in parallel or executed sequentially, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The weight of the related components mentioned in the description of the embodiments of the present application may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present application as long as it is scaled up or down according to the description of the embodiments of the present application. Specifically, the mass described in the specification of the embodiments of the present application may be a mass unit known in the chemical industry field such as μ g, mg, g, kg, etc.

The terms "first" and "second" are used for descriptive purposes only and are used for distinguishing purposes such as substances from one another, and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. For example, a first XX may also be referred to as a second XX, and similarly, a second XX may also be referred to as a first XX, without departing from the scope of embodiments of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In a first aspect of the embodiments of the present application, there is provided an anti-wear silicone rubber composition, which comprises the following components in percentage by weight, based on 100% of the total weight of the anti-wear silicone rubber composition:

according to the anti-wear silicone rubber composition provided by the first aspect of the application, a siloxane polymer is used as a main raw material, under the action of a cross-linking agent, the siloxane polymer, a filler and an anti-wear additive are subjected to a cross-linking reaction, and the three have synergistic effects, so that the strength of a siloxane polymer grid structure is further enhanced, the friction coefficient of the anti-wear silicone rubber composition is reduced, and the anti-wear performance of the anti-wear silicone rubber composition is improved; meanwhile, the chemical affinity of the structure control agent reinforced filler and the anti-wear additive with the siloxane polymer is utilized to ensure the fluidity and the processing performance of the anti-wear silicone rubber composition; and furthermore, by compounding the auxiliary agent with a specific weight percentage content ratio, the performance of the wear-resistant silicone rubber composition is improved, so that the wear-resistant silicone rubber composition can achieve stable performance and stronger wear resistance, and the application is wider.

Specifically, the anti-wear silicone rubber composition comprises 51-93.8 wt% of siloxane polymer by taking the total weight of the anti-wear silicone rubber composition as 100%, wherein the molecular general formula of the siloxane polymer is as follows: (R)₂SiO)_xAnd x is more than or equal to 1, the polymer contains Si-O-Si bonds to form a main chain structure, and the siloxane polymer is used as a main raw material and can provide a basic cross-linked grid structure. The siloxane polymer with the weight percentage content is added and is used in combination with other components, which is favorable for better improving the strong crosslinking of the wear-resistant silicone rubber composition and is favorable for the modification treatment of the siloxane polymer by other components. In a particular embodiment of the invention, the added mass of siloxane polymer is selected from 51 wt%, 55 wt%, 60 wt%, 65 wt%, 70 wt%, 75 wt%, 80 wt%, 85 wt%, 90 wt%, 93.8 wt%.

Preferably, the silicone polymer is selected from silicone polymers containing vinyl crosslinking active groups, and the silicone polymer containing vinyl crosslinking active groups is selected to be capable of better performing crosslinking reaction to obtain the silicone composition, wherein the molecular formula of the silicone polymer containing vinyl crosslinking active groups is as follows: (CH)₃)₃SiO[(CH₃)₂SiO]_m[(CH₂＝CH)(CH₃)SiO]_nSi(CH₃)₃And m is more than or equal to 1, and n is more than or equal to 1.

Preferably, the content of the vinyl group is 0.10 to 5.0 mol%. In the crosslinking reaction process, the content of vinyl in the siloxane polymer determines the crosslinking degree of the wear-resistant silicone rubber composition, the molar percentage content of the vinyl is controlled, the vinyl content is ensured to be moderate, the crosslinking degree is moderate, the elongation of the wear-resistant silicone rubber composition is ensured to be higher, and the hardness of the obtained crosslinking network structure is proper. If the vinyl content is too high, the crosslinking degree is too high, and the phenomena of too low elongation and brittleness of the anti-wear silicone rubber composition occur; if the vinyl is too low, the crosslinking degree is insufficient, the hardness of the silicone rubber is insufficient, the compression deformation is large, and the subsequent use is not facilitated. Preferably, the mol percent content of the vinyl is 0.20-3.0 mol%, the content of the vinyl is further controlled, the high crosslinking degree of the silicon rubber composition is ensured, and the hardness of the obtained crosslinked network structure is moderate.

Further preferably, the siloxane polymer containing vinyl crosslinking active groups is selected from at least one of vinyl polydimethylsiloxane, vinyl polyphenylsiloxane and vinyl polyfluorosiloxane, and the siloxane polymer containing vinyl crosslinking active groups is selected as a main raw material, so that a basic crosslinking grid structure can be provided, and the subsequent crosslinking reaction is facilitated.

Specifically, the wear-resistant silicone rubber composition comprises 5-25 wt% of filler, and under the action of a cross-linking agent, the filler and a siloxane polymer are subjected to a cross-linking reaction, so that a cross-linked grid structure formed by the siloxane polymer can be filled, the strength of the grid structure is further enhanced, and the wear resistance of the material is improved. By controlling the mass percentage of the siloxane polymer and the filler, the filler can better act with the siloxane polymer, the grid structure of the siloxane polymer is improved, the strength of the grid structure is further improved, and the subsequent use is facilitated. In a particular embodiment of the invention, the added mass of filler is selected from 5 wt%, 10 wt%, 15 wt%, 20 wt%, 25 wt%.

Preferably, the filler is selected from at least one of nano silica and silicone. In some embodiments, the filler is selected from nano silica, the nano silica is an inorganic chemical material, the microstructure is spherical, and the nano silica is in a quasi-particle structure of flocculent and net, and the nano silica is fully and uniformly dispersed into the siloxane polymer, so that the material performance of the siloxane polymer can be comprehensively improved, the strength and the elongation of the material can be improved, and meanwhile, the wear resistance of the surface of the material can be improved, and the smoothness of the surface of the material can be improved.

In some embodiments, the nanosilica has a specific surface area of 100 to 380 (m)²/g), the specific surface area of the filler is controlled to be moderate, and the obtained higher strength and anti-friction performance are ensured. In the specific embodiment of the invention, the specific surface area of the nano silicon dioxide is 300-380 (m)²/g)。

Specifically, the wear-resistant silicone rubber composition comprises 0.5-10 wt% of a wear-resistant additive, and the wear-resistant additive and a siloxane polymer are subjected to a crosslinking reaction under the action of a crosslinking agent, so that the friction coefficient is further reduced, and the wear resistance of the material is improved, wherein the total weight of the wear-resistant silicone rubber composition is 100%. By controlling the mass percentage of the siloxane polymer and the anti-wear additive, the anti-wear additive can better act with the siloxane polymer, the friction coefficient of the siloxane polymer is improved, and the wear resistance of the anti-wear silicone rubber composition is improved. In a particular embodiment of the invention, the added mass of antiwear additive is selected from 0.5 wt%, 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt%, 3.5 wt%, 4 wt%, 4.5 wt%, 5 wt%, 5.5 wt%, 6 wt%, 6.5 wt%, 7 wt%, 7.5 wt%, 8 wt%, 8.5 wt%, 9 wt%, 9.5 wt%, 10 wt%.

Preferably, the antiwear additive is selected from PTFE powder, MoS₂Powder, WS₂At least one of a powder, a graphite powder, a zirconium phosphate powder, and a BN powder. One or more materials are selected as the anti-wear additive, and can generate cross-linking reaction with the siloxane polymer under the action of the cross-linking agent, so that the wear resistance of the anti-wear silicone rubber composition is improved.

Preferably, the particle size of the anti-wear additive is selected from 1-10 μm, the particle size of the anti-wear additive is controlled to be 1-10 μm, the filling quantity is ensured to be moderate, and the anti-wear additive and the siloxane polymer are subjected to a crosslinking reaction, so that the wear resistance of the anti-wear silicone rubber composition is improved.

Preferably, the antiwear additive is selected from modified antiwear additives obtained by adopting surfactant treatment, and the antiwear additive is subjected to modification treatment, so that the dispersion effect of powder and the bonding strength with rubber are further improved, the mechanical property is improved, and the prepared antiwear silicone rubber composition has stronger abrasion resistance.

In some embodiments, the surfactant is selected from at least one of aminopropyltrimethoxysilane, dimethyldimethoxysilane, vinyltrimethoxysilane, hexamethyldisilazane. The surfactant is adopted to modify the anti-wear additive, so that the anti-wear performance of the modified anti-wear additive is stronger after the cross-linking reaction with the siloxane polymer.

In some embodiments, the modified antiwear additive is selected from an organic amine intercalation modified antiwear additive, and the organic amine intercalation modified antiwear additive is selected to improve the bearing capacity, reduce the friction coefficient and improve the antiwear capacity of the siloxane polymer, and the provided "amine intercalation" structure is beneficial to better improving the antiwear performance.

Specifically, the anti-wear silicone rubber composition comprises 0.5-8 wt% of a structure control agent, based on 100% of the total weight of the anti-wear silicone rubber composition; the structure control agent is added to enhance the chemical affinity of the filler and the anti-wear additive with the siloxane polymer and ensure the fluidity and the processing performance of the anti-wear silicone rubber composition. By controlling the amount of addition of the structure control agent, the interaction of the synergistic filler and antiwear additive with the silicone polymer is further facilitated. In a specific embodiment of the invention, the added mass of the structure-controlling agent is selected from 0.5 wt%, 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt%, 3.5 wt%, 4 wt%, 4.5 wt%, 5 wt%, 5.5 wt%, 6 wt%, 6.5 wt%, 7 wt%, 7.5 wt%, 8 wt%.

Preferably, the structure-controlling agent is at least one selected from the group consisting of hydroxysilane compounds, alkoxysiloxane compounds, silazane compounds and boron-containing siloxane compounds. More preferably, the hydroxysilane compound is at least one selected from the group consisting of hydroxysilicone oil and diphenylsilanediol; the alkoxy siloxane compound is selected from alkoxy low molecular polysiloxane; the silazane compound is at least one selected from hexamethyldisilazane and cyclic trisilazane.

In some embodiments, the structure control agent is selected from hydroxyl silicone oil, and the mass percentage of hydroxyl in the hydroxyl silicone oil is 1.0-8.0 wt%; if the hydroxyl content of the hydroxyl silicone oil is low, more hydroxyl silicone oil needs to be added, and the mechanical properties of the rubber material are affected. Further preferably, the mass percentage of the hydroxyl in the hydroxyl silicone oil is controlled to be 4.0-8.0 wt%.

Specifically, the anti-wear silicone rubber composition comprises 0.1-3 wt% of a cross-linking agent, based on 100% of the total weight of the anti-wear silicone rubber composition; the cross-linking agent is provided mainly for the purpose of forming cross-linking reaction between each component and siloxane polymer to generate the anti-wear silicone rubber composition with high strength and strong anti-wear performance. In a specific embodiment of the invention, the added mass of the cross-linking agent is selected from 0.1 wt%, 0.5 wt%, 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt%.

Preferably, the crosslinking agent is selected from at least one of 2, 5-dimethyl-2, 5-di-tert-butyl peroxy hexane and 2, 4-dichloro benzoyl peroxide.

Specifically, the anti-wear silicone rubber composition comprises 0.1-3 wt% of an auxiliary agent, and the auxiliary agent with a functional effect can be selected for addition, wherein the total weight of the anti-wear silicone rubber composition is 100%. In a specific embodiment of the invention, the added mass of the cross-linking agent is selected from 0.1 wt%, 0.5 wt%, 1 wt%, 1.5 wt%, 2 wt%, 2.5 wt%, 3 wt%.

Preferably, the auxiliary agent is at least one selected from cerium oxide, zinc oxide and zinc stearate, wherein the cerium oxide is added to promote the reaction and increase the reaction rate; the zinc oxide is added, so that the components can be better dispersed and the dispersibility is stronger; the zinc stearate is added to facilitate the sulfuration and activation in the sulfuration treatment process.

In a second aspect of the embodiments of the present application, there is provided a method for preparing an anti-wear silicone rubber composition, comprising the steps of:

s01, weighing the components according to the formula of the wear-resistant silicone rubber composition;

s02, mixing a siloxane polymer, a filler, an anti-wear additive, a structure control agent and an auxiliary agent, and then carrying out first mixing treatment to obtain a first mixture;

s03, carrying out second mixing treatment on the first mixture to obtain a second mixture;

s04, carrying out third mixing treatment on the second mixture to obtain silicon rubber base rubber;

s05, mixing the silicon rubber base rubber with a cross-linking agent, and then carrying out first vulcanization treatment to obtain a first silicon rubber mixture;

and S06, carrying out second vulcanization treatment on the first silicon rubber mixture to obtain the anti-wear silicon rubber composition.

According to the preparation method of the anti-wear silicone rubber composition provided by the second aspect of the application, each component substance is subjected to three times of mixing treatment under different conditions, and then is subjected to two times of vulcanization treatment under different conditions to prepare the anti-wear silicone rubber composition.

In the step S01, the components are weighed according to the formula of the anti-wear silicone rubber composition, and the types and the addition amounts of the components are as above, which will not be described herein again for the sake of brevity.

Preferably, the antiwear additive is selected from modified antiwear additives treated with a surfactant. In some embodiments, the method of making further comprises: the method comprises the following steps of (1) carrying out modification treatment on the antifriction additive by adopting a surfactant, wherein the modification treatment comprises the following steps:

s011, mixing a surfactant and an organic solvent aqueous solution to obtain a modified liquid, wherein the solute mass percent concentration of the modified liquid is 10-15%;

s012, mixing an anti-wear additive and a modification liquid to obtain a first treatment liquid;

s013, carrying out constant-temperature mixing treatment on the first treatment liquid to obtain a first material;

and S014, drying and grinding the first material to obtain the modified antiwear additive.

In the step S011, the volume fraction of the organic solvent in the organic solvent aqueous solution is 40-50%; mixing the surfactant and the organic solvent aqueous solution to obtain the modified liquid. The mass percent concentration of the solute in the modifying solution is 10-15%, and the mass percent concentration of the modifying agent in the modifying solution is controlled, so that the modifying treatment effect can be further improved, and the modifying effect of the anti-wear additive is better.

In the step S012, in the step of mixing the anti-wear additive and the modifying solution, the mass ratio of the anti-wear additive to the modifying solution is 1: (5-6), controlling the mass ratio of the anti-wear additive to the modification liquid, and ensuring that the anti-wear additive can be fully modified.

In the step of mixing the first treatment liquid at a constant temperature in step S013, the first treatment liquid is mixed at a constant temperature of 55 to 60 ℃.

Further, the mixing treatment includes, but is not limited to, stirring for sufficient reaction of the components in the first treatment solution. In some embodiments, the first treatment liquid is treated by stirring, wherein the stirring speed is 500-600 r/min, and the stirring time is 2-3 hours, so as to obtain the first material.

In step S014, the first material is dried and ground to obtain the modified anti-wear additive. In some embodiments, the step of drying the first material includes, but is not limited to, drying by vacuum drying, high temperature drying, and the like.

The modified antiwear additive obtained by the method for modifying the antiwear additive by adopting the surfactant can be used in the preparation process of the antiwear silicone rubber composition.

In the step S02, in which the siloxane polymer, the filler, the anti-wear additive, the structure-controlling agent, and the auxiliary agent are mixed and then subjected to the first mixing treatment, the siloxane polymer, the filler, the anti-wear additive, the structure-controlling agent, and the auxiliary agent are mixed and then subjected to mixing treatment at 20 to 30 ℃ for 4 to 4.5 hours, thereby obtaining a first mixture. In the first step, the components are mixed evenly by controlling the mixing to be carried out at room temperature.

In the step of performing the second mixing treatment on the first mixture in the step S03, the first mixture is mixed and treated at 150 to 160 ℃ for 2 to 2.5 hours to obtain a second mixture; and further carrying out strong mechanical shearing action on the first mixture under a high-temperature condition to obtain the silicone rubber base rubber.

In the step of subjecting the second mixture to the third kneading treatment in step S04, the second mixture is kneaded under vacuum conditions for 1 to 1.5 hours to obtain the silicone rubber base rubber.

In the step S05, in which the silicone rubber base rubber and the crosslinking agent are mixed and then subjected to a first vulcanization treatment, the silicone rubber base rubber and the crosslinking agent are mixed and then subjected to a vulcanization treatment at 165 to 170 ℃ for 10 to 15 minutes to obtain a first silicone rubber mixture, and the silicone rubber base rubber and the crosslinking agent are subjected to a vulcanization reaction to generate a crosslinking effect on the silicone rubber base rubber and form a grid structure.

In the step S06, in the step of performing the second vulcanization treatment on the first silicone rubber mixture, the first silicone rubber mixture is vulcanized for 4 to 4.5 hours at a temperature of 200 to 220 ℃, and is further subjected to a second vulcanization treatment, so as to obtain the anti-wear silicone rubber composition.

In a third aspect of the embodiments of the present application, there is provided a sealing product, which includes an anti-wear silicone rubber composition, wherein the anti-wear silicone rubber composition is an anti-wear silicone rubber composition or is prepared by a preparation method of the anti-wear silicone rubber composition.

In some embodiments, the sealing product includes, but is not limited to, a seal ring, a gasket seal. Preferably, the seal ring is selected from an O-ring seal or a profiled seal ring.

According to the sealing product provided by the third aspect of the application, as the sealing product comprises the anti-wear silicone rubber composition, and the anti-wear silicone rubber composition is the anti-wear silicone rubber composition or is prepared by the preparation method of the anti-wear silicone rubber composition, the sealing product has higher product strength and stronger anti-wear capability, and can be widely applied.

The following description will be given with reference to specific examples.