CN111171716A - Epoxy silicone rubber coating material and preparation method and application thereof - Google Patents

Epoxy silicone rubber coating material and preparation method and application thereof Download PDF

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Publication number
CN111171716A
CN111171716A CN201911405892.2A CN201911405892A CN111171716A CN 111171716 A CN111171716 A CN 111171716A CN 201911405892 A CN201911405892 A CN 201911405892A CN 111171716 A CN111171716 A CN 111171716A
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silicone rubber
base material
mixing
epoxy
epoxidized
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赵永青
朱小勇
张利华
金家骏
郑文革
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Jiangsu Volsun New Material Technology Co ltd
Ningbo Institute of Material Technology and Engineering of CAS
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Jiangsu Volsun New Material Technology Co ltd
Ningbo Institute of Material Technology and Engineering of CAS
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • C09D183/06—Polysiloxanes containing silicon bound to oxygen-containing groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/40—Distributing applied liquids or other fluent materials by members moving relatively to surface
    • B05D1/42—Distributing applied liquids or other fluent materials by members moving relatively to surface by non-rotary members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/0413—Heating with air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/18—Fireproof paints including high temperature resistant paints
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/308—Wires with resins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
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Abstract

An epoxy silicone rubber coating material, a preparation method and an application thereof are prepared by taking epoxy silicone rubber, silicone resin and white carbon black as main raw materials. The addition type liquid epoxidized silicone rubber with fluidity is used for replacing a silicone rubber/toluene dilute solution to coat glass fibers, a large number of hydrogen bonds can be formed between epoxy groups of the epoxidized silicone rubber and silicon-oxygen groups on the surfaces of the glass fibers, the bonding effect between the epoxidized silicone rubber and the glass fibers is greatly increased, no organic reagent is needed in the process, and the process has the advantages of environmental friendliness, simple process, high production efficiency and the like, and completely solves the problem that the prior art seriously harms the natural environment and the human health.

Description

Epoxy silicone rubber coating material and preparation method and application thereof
Technical Field
The invention belongs to the field of electrical insulation protection high polymer materials, and particularly relates to an epoxy silicone rubber coating material and a preparation method and application thereof.
Background
Silicone materials are important industrial basic raw materials and also one of the important materials indispensable in automobile manufacturing. The silicone rubber material has excellent performances of electrical insulation, high and low temperature resistance, aging resistance, wear resistance and the like, overcomes the defects of polyolefin and thermoplastic elastomer materials while integrating the advantages of the polyolefin and thermoplastic elastomer materials, can reduce the weight of an automobile and reduce the emission of carbon dioxide, and is a preferred protective material for electrical systems of batteries, motors, electric controls and the like of new energy automobiles.
The silicone rubber coated fiber sleeve has excellent characteristics of temperature resistance, insulation, oil resistance, flame retardancy and the like, and is widely used in the fields of new energy automobiles, high-speed trains, electronic appliances, motor electric control and the like. The existing silicone rubber coated glass fiber sleeve is prepared by weaving high-purity alkali-free glass fiber into a tube, coating silicone rubber on the outer wall of the tube and performing high-temperature vulcanization treatment. Among them, the coating process requires the silicone rubber to have a low viscosity, so that organic solvents such as toluene are often used for dissolution, but the organic solvents may volatilize during the coating or vulcanization process and cause serious harm to the environment. In addition, the glass fiber needs to be subjected to special surface treatment to obtain a good bonding effect, and the process is complicated and high in energy consumption. Therefore, it is urgent to solve and improve the problems of the prior art formulation of silicone rubber coated fiber casing.
Disclosure of Invention
Aiming at the technical current situation, the invention provides an epoxy silicone rubber coating material and a preparation method and application thereof, and aims to solve the problems of environmental protection and high energy consumption in the preparation process of the existing silicone rubber coated fiber sleeve.
In order to achieve the purpose, the technical scheme adopted by the photo-crosslinking organic silicon coating material is as follows: the epoxy silicone rubber coating material comprises the following components in parts by weight:
100 parts of epoxy silicone rubber;
5-60 parts of silicone resin;
2-50 parts of white carbon black;
2-10 parts of a cross-linking agent;
0.5-5 parts of a catalyst;
0-15 parts of color paste.
Wherein:
the epoxidized silicone rubber is vinyl silicone rubber with an end group or a side group containing an epoxy group; the dynamic viscosity is 300-20000 mPa.s, the concentration of epoxy group is 0.01-0.25mol/kg, and the concentration of vinyl group is 0.005-0.20 mol/kg;
the silicone resin is a mixture of one or more of vinyl silicone resin and vinyl MQ silicone resin in any proportion, the dynamic viscosity of the silicone resin is 300-20000 mPa.s, and the molar ratio of M/Q is 0.1-1.5, wherein M represents a monofunctional group Si-O unit, and Q represents a tetrafunctional group Si-O unit;
the cross-linking agent is one or a mixture of more than two of linear methyl hydrogen polysiloxane, cyclic methyl hydrogen polysiloxane and hydrosilicyl-containing MQ silicon resin in any proportion, the viscosity of the cross-linking agent is 10-100 mPa.s, and the molar ratio of SiH/SiVi is 1.0-2.2;
the catalyst is one or a mixture of more than two of platinum-siloxane complex, platinum-alkyne complex and alcohol modified chloroplatinic acid according to any proportion.
The relevant content in the above technical solution is explained as follows:
1. in the scheme, the mass fraction of platinum in the catalyst is 0.1-1.5% of the catalyst. With respect to the catalyst, an alkynol-based compound, a polyvinyl polysiloxane, an amide-based compound or a maleate-based compound is used to control the vulcanization rate of the platinum catalyst and improve the storage stability of the coating material.
2. In the scheme, the white carbon black is fumed silica, and the specific surface area of the fumed silica is 100-500m2(ii) in terms of/g. According to the fumed silica, the fumed silica is subjected to surface hydrophobic treatment by adopting hexamethyldisilazane and water, wherein the hexamethyldisilazane accounts for 1-10 parts, and the water accounts for 0.5-4 parts.
In order to achieve the purpose, the preparation method of the photo-crosslinking organic silicon coating material adopts the following technical scheme: the preparation method of the epoxidized silicone rubber coating material is based on the formula of the epoxidized silicone rubber coating material and comprises the following steps:
firstly, adding epoxy silicone rubber, silicone resin and white carbon black into a kneading machine for mixing, and uniformly mixing to obtain an epoxy silicone rubber coating base material;
secondly, taking a part of the epoxidized silicone rubber coating base material prepared in the first step, adding a cross-linking agent into the base material, and uniformly mixing to prepare a coating base material A;
thirdly, taking the other part of the epoxidized silicone rubber coating base material prepared in the first step, adding a catalyst into the base material, and mixing the mixture uniformly to prepare a coating base material B;
and fourthly, adding the coating base material A prepared in the second step and the coating base material B prepared in the third step into a mechanical stirrer for mixing uniformly to prepare the epoxy silicone rubber coating material.
The relevant content in the above technical solution is explained as follows:
1. in the scheme, in the fourth step, the color paste is added into the coating base material A prepared in the second step and is uniformly stirred, and then the color paste and the coating base material B prepared in the third step are added into a mechanical stirrer and are mixed.
2. In the scheme, in the first step, the mixing temperature is 50-150 ℃, the mixing time is 10-60min, and the rotor speed is 60-200 rpm;
in the second step, the mixing temperature is 25-80 ℃, the mixing time is 10-60min, and the rotor speed is 40-120 rpm;
in the third step, the mixing temperature is 30-80 ℃, the mixing time is 10-60min, and the rotating speed of a rotor is 40-120 rpm;
in the fourth step, the mixing temperature is 25-50 ℃, the mixing time is 10-60min, the rotating speed of a rotor is 100-1000 rpm, and the mass ratio of the coating base material A to the coating base material B is 1:2-1: 15.
In order to achieve the aim, the fiber sleeve coating treatment method adopts the technical scheme that: a coating treatment method of a fiber sleeve is characterized in that: and (2) passing the fiber sleeve through a container filled with the prepared epoxy silicone rubber coating material, controlling the thickness of the coating material on the surface of the fiber sleeve by regulating the aperture of a through hole arranged at the bottom of the container so as to control the coating amount, and vulcanizing in a high-temperature hot air channel to prepare the silicone rubber coated fiber sleeve, wherein the hot air temperature is 120-200 ℃, the vulcanizing time is 3-30min, the hot air channel is set to be heated in three sections, namely the hot air temperature of the first section, the hot air temperature of the second section and the hot air temperature of the third section are sequentially increased, so that the smoothness of the silicone rubber coated surface and the sufficient vulcanization of a coating.
Due to the application of the technical scheme, compared with the prior art, the epoxy silicone rubber coating material is prepared by adopting epoxy silicone rubber, silicone resin and white carbon black as main raw materials, and has the following advantages:
1. according to the invention, the addition type liquid epoxidized silicone rubber with fluidity is used for replacing a silicone rubber diluent to coat the glass fiber, no organic reagent is needed in the process, and the process has the advantages of environmental friendliness, simple process, high production efficiency and the like, and completely solves the problem that the prior art seriously harms the natural environment and the human health.
2. The epoxy groups of the epoxy silicon rubber and the silicon-oxygen groups on the surface of the glass or quartz fiber can form a large number of hydrogen bonds, so that the bonding effect between the epoxy silicon rubber and the glass or quartz fiber is greatly increased, the glass or quartz fiber base material can be directly coated without special surface treatment and addition of a tackifier in the formula, and the surface of the glass or quartz fiber can be prevented from being subjected to complicated pretreatment such as chemical etching, high-temperature burning and the like.
3. The silicone rubber coated fiber sleeve prepared by the invention has very outstanding product performance, the heat resistance of the silicone rubber coated fiber sleeve exceeds the C-grade high temperature grade, the silicone rubber coated fiber sleeve can work for a long time in the environment of higher than 250 ℃, and the silicone rubber coated fiber sleeve has the characteristics of ageing resistance, high strength, durability, insulation, fire resistance and the like.
In a word, the invention adopts the epoxidized silicone rubber, the silicone resin and the white carbon black as main raw materials, the addition type liquid epoxidized silicone rubber with fluidity is used for replacing the silicone rubber/toluene dilute solution to coat the glass fiber, and the glass fiber and other base materials can obtain excellent bonding effect without special surface treatment, so the production technology has the advantages of environmental protection, simple process, low production cost, high production efficiency and the like.
Detailed Description
The invention is further described below with reference to the following examples:
examples 1 to 5: the raw material composition of an epoxidized silicone rubber coating material is shown in table 1, and the raw material composition values in table 1 are parts by mass.
Table 1 shows the raw material formulations of the epoxy silicone rubber coating materials of examples 1 to 5:
example 1 Example 2 Example 3 Example 4 Example 5
Epoxidized silicone rubber 100 portions of 100 portions of 100 portions of 100 portions of 100 portions of
Silicone resin 57 portions 45 portions of 10 portions of 34 22 portions of
White carbon black 35 portions of 13 portions of 46 portions of 6 portions of 28 portions of
Crosslinking agent 7 portions of 10 portions of 2 portions of 4 portions of 9 portions of
Catalyst and process for preparing same 0.6 part 3.4 parts of 5 portions of 1.3 parts of 2.1 parts of
Color paste 0 13 4 10 7
The raw material names and characteristics in table 1 above are described as follows:
1. the epoxidized silicone rubber is vinyl silicone rubber with an end group or a side group containing an epoxy group; the dynamic viscosity is 300 to 20000 mPas, the concentration of epoxy group is 0.01 to 0.25mol/kg, and the concentration of vinyl group is 0.005 to 0.20 mol/kg.
Example 1: the vinyl silicone rubber with the terminal group containing epoxy group is adopted.
Example 2: the vinyl silicone rubber with the terminal group containing epoxy group is adopted.
Example 3: vinyl silicone rubber with side groups containing epoxy groups is adopted.
Example 4: the vinyl silicone rubber with the terminal group containing epoxy group is adopted.
Example 5: vinyl silicone rubber with side groups containing epoxy groups is adopted.
2. The silicone resin is a mixture of one or more of vinyl silicone resin and vinyl MQ silicone resin according to any proportion, the dynamic viscosity of the silicone resin is 300-20000 mPa.s, and the molar ratio of M/Q is 0.1-1.5, wherein M represents a monofunctional group Si-O unit, and Q represents a tetrafunctional group Si-O unit.
Example 1: vinyl silicone resin is used.
Example 2: vinyl silicone resin and vinyl MQ silicone resin are adopted.
Example 3: vinyl MQ silicone resin is used.
Example 4: vinyl silicone resin and vinyl MQ silicone resin are adopted.
Example 5: vinyl silicone resin is used.
3. The white carbon black is fumed silica, and the specific surface area of the white carbon black is 100-500m2(ii) in terms of/g. According to the fumed silica, the fumed silica is subjected to surface hydrophobic treatment by adopting hexamethyldisilazane and water, wherein the hexamethyldisilazane accounts for 1-10 parts, and the water accounts for 0.5-4 parts.
4. The cross-linking agent is a mixture of one or more than two of linear methyl hydrogen polysiloxane, cyclic methyl hydrogen polysiloxane and hydrosilation-containing MQ silicon resin in any proportion, the viscosity of the cross-linking agent is 10-100 mPa.s, and the molar ratio of SiH/SiVi is 1.0-2.2.
Example 1: linear methylhydrogenpolysiloxanes are used.
Example 2: linear methylhydrogenpolysiloxanes are used.
Example 3: MQ silicone resin containing silicon-hydrogen groups is adopted.
Example 4: linear methylhydrogenpolysiloxanes and linear methylhydrogenpolysiloxanes are used.
Example 5: linear methylhydrogenpolysiloxanes and silylhydride-containing MQ silicone resins are employed.
4. The catalyst is one or a mixture of more than two of platinum-siloxane complex, platinum-alkyne complex and alcohol modified chloroplatinic acid according to any proportion. In the catalyst, the mass fraction of platinum is 0.1-1.5% of the catalyst.
With respect to the catalyst, an alkynol-based compound, a polyvinyl polysiloxane, an amide-based compound or a maleate-based compound is used to control the vulcanization rate of the platinum catalyst and improve the storage stability of the coating material.
The alkynol compound is particularly alkynyloxy silane, alkyne-containing alkoxy polysiloxane, and a combination of alkynol and acrylate or a combination of alkynol and amine; the polyvinyl polysiloxane is methyl vinyl cyclotetrasiloxane or methyl vinyl disiloxane; the amide compound is particularly diallyl formamide, diallyl benzamide or tetraallyl benzenedicarboxamide; the maleate ester compound is specifically monoethyl maleate, monoallyl maleate or diallyl maleate. The substances are inhibitors of the platinum catalyst, and the activity of the catalyst can be controlled by the platinum catalyst/inhibitor ratio and the types of the inhibitors, namely the slow vulcanization speed of the catalyst at normal temperature and the fast vulcanization speed at high temperature are ensured.
Example 6: a preparation method of an epoxy silicone rubber coating material is characterized by comprising the following steps: based on the formulation of the epoxidized silicone rubber coating material described in any of examples 1 to 5, the preparation was carried out as follows:
firstly, adding the epoxy silicone rubber, the silicone resin and the white carbon black into a kneader for mixing, and uniformly mixing to obtain the epoxy silicone rubber coating base material. In the first step, the mixing temperature is 50-150 ℃, and the further optimization is 60-120 ℃; the mixing time is 10-60min, and the preferred mixing time is 20-40 min; the rotor speed is 60 to 200rpm, preferably 100 to 150 rpm.
And step two, taking a part of the epoxidized silicone rubber coating base material prepared in the step one, adding a cross-linking agent into the base material, and uniformly mixing to prepare a coating base material A. In the second step, the mixing temperature is 25-80 ℃, and the more preferable temperature is 35-50 ℃; the mixing time is 10-60min, and the preferable time is 15-25 min; the rotation speed of the rotor is 40-120rpm, and more preferably 60-80 rpm.
And thirdly, taking the other part of the epoxidized silicone rubber coating base material prepared in the first step, adding a catalyst into the base material, and mixing the mixture uniformly to prepare a coating base material B. In the third step, the mixing temperature is 30-80 ℃, and the further optimization is 35-50 ℃; the mixing time is 10-60min, and preferably 15-25 min; the rotation speed of the rotor is 40 to 120rpm, and more preferably 60 to 80 rpm.
And fourthly, adding the color paste into the coating base material A prepared in the second step, uniformly stirring, adding the color paste and the coating base material B prepared in the third step into a mechanical stirrer, and uniformly mixing to prepare the epoxy silicone rubber coating material. In the fourth step, the mixing temperature is 25-50 ℃, and the further optimization is 30-40 ℃; the mixing time is 10-60min, and preferably 15-25 min; the rotating speed of the rotor is 100-1000 rpm, and more preferably 300-800 rpm; the mass ratio of the coating base material A to the coating base material B is 1:2-1: 15.
Example 7: a coating treatment method of a fiber sleeve is characterized in that: passing the fiber sleeve through a container filled with the epoxidized silicone rubber coating material prepared in the claim 7, controlling the thickness of the coating material on the surface of the fiber sleeve by regulating the aperture size of a through hole arranged at the bottom of the container so as to control the coating amount, and vulcanizing in a high-temperature hot air channel to prepare the silicone rubber coated fiber sleeve, wherein the temperature of hot air is 120-200 ℃, and further preferably 150-180 ℃; the vulcanizing time is 3-30min, and the preferable time is 5-15 min, wherein the hot air channel is set to be heated in three stages, namely the hot air temperature of the first stage, the second stage and the third stage is sequentially increased, so that the smoothness of the coated surface of the silicon rubber and the sufficient vulcanization of the coated layer are ensured.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (10)

1. An epoxy silicone rubber coating material, characterized in that: the formula comprises the following components in parts by weight:
100 parts of epoxy silicone rubber;
5-60 parts of silicone resin;
2-50 parts of white carbon black;
2-10 parts of a cross-linking agent;
0.5-5 parts of a catalyst;
0-15 parts of color paste;
wherein:
the epoxidized silicone rubber is vinyl silicone rubber with an end group or a side group containing an epoxy group; the dynamic viscosity is 300-20000 mPa.s, the concentration of epoxy group is 0.01-0.25mol/kg, and the concentration of vinyl group is 0.005-0.20 mol/kg;
the silicone resin is a mixture of one or more of vinyl silicone resin and vinyl MQ silicone resin in any proportion, the dynamic viscosity of the silicone resin is 300-20000 mPa.s, and the molar ratio of M/Q is 0.1-1.5, wherein M represents a monofunctional group Si-O unit, and Q represents a tetrafunctional group Si-O unit;
the cross-linking agent is one or a mixture of more than two of linear methyl hydrogen polysiloxane, cyclic methyl hydrogen polysiloxane and hydrosilicyl-containing MQ silicon resin in any proportion, the viscosity of the cross-linking agent is 10-100 mPa.s, and the molar ratio of SiH/SiVi is 1.0-2.2;
the catalyst is one or a mixture of more than two of platinum-siloxane complex, platinum-alkyne complex and alcohol modified chloroplatinic acid according to any proportion.
2. The epoxidized silicone rubber coating material according to claim 1, characterized in that: in the catalyst, the mass fraction of platinum is 0.1-1.5% of the catalyst.
3. The epoxidized silicone rubber coating material according to claim 2, characterized in that: with respect to the catalyst, an alkynol-based compound, a polyvinyl polysiloxane, an amide-based compound or a maleate-based compound is used to control the vulcanization rate of the platinum catalyst and improve the storage stability of the coating material.
4. The silicone liquid coating material according to claim 3, characterized in that: the alkynol compound is particularly alkynyloxy silane, alkyne-containing alkoxy polysiloxane, and a combination of alkynol and acrylate or a combination of alkynol and amine; the polyvinyl polysiloxane is methyl vinyl cyclotetrasiloxane or methyl vinyl disiloxane; the amide compound is particularly diallyl formamide, diallyl benzamide or tetraallyl benzenedicarboxamide; the maleate ester compound is specifically monoethyl maleate, monoallyl maleate or diallyl maleate.
5. The epoxidized silicone rubber coating material according to claim 1, characterized in that: the white carbon black is fumed silica, and the specific surface area of the white carbon black is 100-500m2/g。
6. The epoxidized silicone rubber coating material according to claim 5, characterized in that: according to the fumed silica, the fumed silica is subjected to surface hydrophobic treatment by adopting hexamethyldisilazane and water, wherein the hexamethyldisilazane accounts for 1-10 parts, and the water accounts for 0.5-4 parts.
7. A preparation method of an epoxy silicone rubber coating material is characterized by comprising the following steps: the epoxidized silicone rubber coating composition of claim 1, which is prepared by the following steps:
firstly, adding epoxy silicone rubber, silicone resin and white carbon black into a kneading machine for mixing, and uniformly mixing to obtain an epoxy silicone rubber coating base material;
secondly, taking a part of the epoxidized silicone rubber coating base material prepared in the first step, adding a cross-linking agent into the base material, and uniformly mixing to prepare a coating base material A;
thirdly, taking the other part of the epoxidized silicone rubber coating base material prepared in the first step, adding a catalyst into the base material, and mixing the mixture uniformly to prepare a coating base material B;
and fourthly, adding the coating base material A prepared in the second step and the coating base material B prepared in the third step into a mechanical stirrer for mixing uniformly to prepare the epoxy silicone rubber coating material.
8. The method of claim 7, wherein: in the fourth step, the color paste is added into the coating base material A prepared in the second step and is uniformly stirred, and then the color paste and the coating base material B prepared in the third step are added into a mechanical stirrer and are mixed.
9. The method of claim 7, wherein:
in the first step, the mixing temperature is 50-150 ℃, the mixing time is 10-60min, and the rotor speed is 60-200 rpm;
in the second step, the mixing temperature is 25-80 ℃, the mixing time is 10-60min, and the rotor speed is 40-120 rpm;
in the third step, the mixing temperature is 30-80 ℃, the mixing time is 10-60min, and the rotating speed of a rotor is 40-120 rpm;
in the fourth step, the mixing temperature is 25-50 ℃, the mixing time is 10-60min, the rotating speed of a rotor is 100-1000 rpm, and the mass ratio of the coating base material A to the coating base material B is 1:2-1: 15.
10. A coating treatment method of a fiber sleeve is characterized in that: and (2) passing the fiber sleeve through a container filled with the epoxidized silicone rubber coating material prepared in the claim 7, controlling the thickness of the coating material on the surface of the fiber sleeve by regulating the aperture size of a through hole arranged at the bottom of the container so as to control the coating amount, and vulcanizing in a high-temperature hot air channel to prepare the silicone rubber coated fiber sleeve, wherein the hot air temperature is 120-200 ℃, the vulcanizing time is 3-30min, and the hot air channel is set to be heated in three sections, namely the hot air temperature of the first section, the hot air temperature of the second section and the hot air temperature of the third section are sequentially increased, so that the smoothness of the silicone rubber coated surface and the sufficient.
CN201911405892.2A 2019-12-31 2019-12-31 Epoxy silicone rubber coating material and preparation method and application thereof Pending CN111171716A (en)

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