Liquid silicone rubber coating and preparation method thereof

Abstract

The invention relates to the technical field of liquid silicone rubber coatings, and discloses a liquid silicone rubber coating and a preparation method thereof. Comprising the following components in parts by mass: 6-15 parts of high vinyl silicone oil, 10-25 parts of a silicone rubber emulsion, 20-35 parts of low vinyl silicone oil, 35-50 parts of liquid silicone resin, 11-14 parts of fumed silica, 2.2-3.5 parts of hexamethyldisilazane, 15-25 parts of a butylbenzene thermoplastic elastomer, 2-5 parts of diatomite, 2-5 parts of an aromatic hydrocarbon solvent and 0.1-0.3 part of an ultraviolet light absorber. The liquid silicone rubber coating provided by the scheme has high wear resistance and elasticity, and is provided by the butylbenzene thermoplastic elastomer component, so that the coating has excellent wear resistance and elasticity, and is suitable for various application environments; according to the scheme, the liquid silicone rubber coating has weather resistance and ultraviolet protection effects, and contains the ultraviolet light absorber, so that the weather resistance and ultraviolet resistance of the coating can be improved, and the service life is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid silicone rubber coatings, and specifically relates to a liquid silicone rubber coating and a preparation method thereof. Background Art

[0002] Liquid silicone rubber coatings are widely used in various surface coating applications, such as coatings, sealants, adhesives, etc. Traditional silicone rubber coatings have some limitations in terms of performance and process, such as a limited viscosity adjustment range, relatively low coating abrasion resistance and elasticity, and unsatisfactory performance in high-temperature environments. In addition, the preparation processes of some traditional coatings may also be relatively cumbersome, making it difficult to meet the diverse requirements for coating performance and process.

[0003] Problems existing in the prior art may include: There are certain limitations in the adjustment of the viscosity of traditional silicone rubber coatings, which may make it difficult to meet the requirements for the fluidity of coatings in different application scenarios; Traditional coatings may perform poorly in terms of coating abrasion resistance and elasticity, restricting their use in high-demand application environments; In high-temperature environments, the performance of traditional silicone rubber coatings may not be ideal, which may be a limiting factor in some industrial fields, such as automotive engine compartment coating, etc.; The preparation processes of some traditional silicone rubber coatings may be relatively complex and inflexible, making it difficult to adapt to the rapidly changing market demands.

[0004] Therefore, there is room for improvement in the liquid silicone rubber coatings of the prior art to improve the adjustability, performance, and process flexibility of the liquid silicone rubber coatings, so as to better meet the requirements of different application scenarios.

[0005] In view of this, the present invention is specifically proposed. Summary of the Invention

[0006] To solve the above technical problems, the basic concept of the technical solution adopted in the present invention is:

[0007] A liquid silicone rubber coating, by mass, comprises the following components: 6 - 15 parts by mass of high vinyl silicone oil, 10 - 25 parts by mass of silicone rubber emulsion, 20 - 35 parts by mass of low vinyl silicone oil, 35 - 50 parts by mass of liquid silicone resin, 11 - 14 parts by mass of fumed silica, 2.2 - 3.5 parts by mass of hexamethyldisilazane, 15 - 25 parts of styrene-butadiene thermoplastic elastomer, 2 - 5 parts of diatomite, 2 - 5 parts of aromatic hydrocarbon solvent, 0.1 - 0.3 parts of ultraviolet absorber, 1 - 5 parts of mildew and bactericide, 5 - 10 parts of defoamer, 0.1 - 1 part of leveling agent, 2 - 4 parts of coupling agent, and a dispersant.

[0008] As a preferred embodiment of the present invention, the high vinyl silicone oil has a viscosity of 2500 - 3500 mPa·s at room temperature and a vinyl content of 5 - 8 wt%.

[0009] As a preferred embodiment of the present invention, the defoamer is a silicone defoamer; the coupling agent is 3-aminopropyltrimethoxysilane.

[0010] As a preferred embodiment of the present invention, the silicone rubber emulsion is subjected to high-temperature vulcanization treatment.

[0011] As a preferred embodiment of the present invention, the specific surface area of the fumed silica is 150 - 200 m² / g; the viscosity of hexamethyldisilazane at room temperature is 15 Pa·s.

[0012] As a preferred embodiment of the present invention, the viscosity of the low vinyl silicone oil at room temperature is 3000 - 3500 mPa·s, and the vinyl content is 1.2 - 2 wt%; the viscosity of the liquid silicone resin is 10000 - 15000 mPa·s, and the solid-liquid content ratio is 0.6 - 0.7.

[0013] As a preferred embodiment of the present invention, the dispersant is a DA-type dispersant, and the mass part of the dispersant is 1 - 3 parts.

[0014] A preparation method of a liquid silicone rubber coating, comprising the following working steps:

[0015] The first step: Ensure that all raw materials are accurately weighed according to the formula; prepare a reaction vessel, a stirring device and a heating / cooling system; the reaction vessel is a glass or stainless steel reaction vessel, ensuring that the vessel has sufficient capacity to accommodate all raw materials; the stirring device is a stirring device equipped with high shear force, including but not limited to a high-speed stirrer or a three-dimensional mixer, to ensure thorough mixing; the heating / cooling system includes but not limited to an electric heater and a water circulation cooling system;

[0016] The second step: Subject the silicone rubber emulsion to high-temperature vulcanization treatment; use a high-temperature vulcanization tank or a vulcanizing furnace to ensure that the vulcanization treatment of the silicone rubber emulsion can be carried out in a controlled high-temperature environment; put the silicone rubber emulsion into the vulcanization tank, set appropriate temperature and time, and carry out vulcanization treatment to ensure that the silicone rubber emulsion obtains the required properties;

[0017] The third step: Mix the silicone oil and the liquid silicone resin; use a high-shear stirring device to sequentially add high vinyl silicone oil, low vinyl silicone oil and liquid silicone resin; make them uniformly mixed under stirring to ensure a homogeneous liquid mixture; then add other coating components; add fumed silica, hexamethyldisilazane, styrene-butadiene thermoplastic elastomer, diatomaceous earth, aromatic hydrocarbon solvent, ultraviolet absorber, mildew and bactericide, defoamer, leveling agent, coupling agent and dispersant one by one; stir with a high-shear stirring device after each addition to ensure uniform dispersion of each component;

[0018] Step 4: Adjust the viscosity and solid-liquid content; Gradually add adjusting agents, such as diluents or thickeners, as needed to adjust the viscosity and solid-liquid content of the coating; Conduct tests on the viscosity and solid-liquid content to ensure compliance with product specifications;

[0019] Step 5: Final adjustment and inspection; Conduct final adjustments, such as adjusting the pH value, viscosity, etc., to meet the final requirements of the coating; Packaging and storage; Automatically package the finally prepared liquid silicone rubber coating and store it under appropriate conditions to ensure that the coating quality is not affected.

[0020] The present invention has the following beneficial effects compared with the prior art:

[0021] 1. The liquid silicone rubber coating of this solution has high wear resistance and elasticity provided by the styrene-butadiene thermoplastic elastomer component, making the coating have excellent wear resistance and elasticity and being suitable for various application environments; The liquid silicone rubber coating of the solution has the functions of weather resistance and ultraviolet protection. It contains ultraviolet absorbers, which can improve the weather resistance of the coating and its resistance to ultraviolet rays, and extend the service life.

[0022] 2. During the preparation process of the liquid silicone rubber coating of this solution, by adjusting components such as silicone oil and liquid silicone resin in the coating, the viscosity and solid-liquid content can be easily adjusted to meet different application requirements.

[0023] 3. The silicone rubber emulsion in the liquid silicone rubber coating of this solution undergoes high-temperature vulcanization treatment, which can improve the performance of the silicone rubber and make it more suitable for specific industrial applications; The high-temperature vulcanization treatment of the silicone rubber emulsion helps to optimize its performance and improve wear resistance and weather resistance.

[0024] 4. Adding organosilicon defoamers and leveling agents to the liquid silicone rubber coating of this solution helps to prevent the generation of bubbles, improve the flatness of the coating surface, and improve the coating effect; The liquid silicone rubber coating of this solution uses silicone rubber emulsion and environmentally friendly mildew and bactericide, which helps to improve the environmental friendliness of the coating and meet modern environmental protection standards. Specific embodiments

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the embodiments of the present invention. The following embodiments are used to illustrate the present invention.

[0026] Embodiment 1:

[0027] A liquid silicone rubber coating, by mass, includes the following components:

[0028] 6 to 15 parts by mass of high vinyl silicone oil, 10 to 25 parts by mass of silicone rubber emulsion, 20 to 35 parts by mass of low vinyl silicone oil, 35 to 50 parts by mass of liquid silicone resin, 11 to 14 parts by mass of fumed silica, 2.2 to 3.5 parts by mass of hexamethyldisilazane, 15 to 25 parts of styrene-butadiene thermoplastic elastomer, 2 to 5 parts of diatomaceous earth, 2 to 5 parts of aromatic solvent, 0.1 to 0.3 parts of ultraviolet absorber, 1 to 5 parts of mildew and bactericide, 5 to 10 parts of defoamer, 0.1 to 1 part of leveling agent, 2 to 4 parts of coupling agent and dispersant.

[0029] The high vinyl silicone oil has a viscosity of 2500 to 3500 mPa·s at room temperature and a vinyl content of 5 to 8 wt%.

[0030] The defoamer is a silicone defoamer; the coupling agent is 3-aminopropyltrimethoxysilane.

[0031] The silicone rubber emulsion is subjected to high-temperature vulcanization treatment.

[0032] The fumed silica has a specific surface area of 150 to 200 m² / g; the hexamethyldisilazane has a viscosity of 15 Pa·s at room temperature.

[0033] The low vinyl silicone oil has a viscosity of 3000 to 3500 mPa·s at room temperature and a vinyl content of 1.2 to 2 wt%; the liquid silicone resin has a viscosity of 10000 to 15000 mPa·s and a solid-liquid content ratio of 0.6 to 0.7.

[0034] The dispersant is a DA-type dispersant, and the mass fraction of the dispersant is 1 to 3 parts.

[0035] Example 2:

[0036] A liquid silicone rubber coating, by mass, comprises the following components:

[0037] 15 parts by mass of high vinyl silicone oil, 25 parts by mass of silicone rubber emulsion, 35 parts by mass of low vinyl silicone oil, 50 parts by mass of liquid silicone resin, 14 parts by mass of fumed silica, 3.5 parts by mass of hexamethyldisilazane, 25 parts of styrene-butadiene thermoplastic elastomer, 5 parts of diatomaceous earth, 5 parts of aromatic solvent, 0.3 parts of ultraviolet absorber, 5 parts of mildew and bactericide, 10 parts of defoamer, 1 part of leveling agent, 4 parts of coupling agent and dispersant.

[0038] The high vinyl silicone oil has a viscosity of 2500 to 3500 mPa·s at room temperature and a vinyl content of 5 to 8 wt%.

[0039] The defoamer is a silicone defoamer; the coupling agent is 3-aminopropyltrimethoxysilane.

[0040] The silicone rubber emulsion is subjected to high-temperature vulcanization treatment.

[0041] The specific surface area of the fumed silica is 150 - 200 m² / g; the viscosity of hexamethyldisilazane at room temperature is 15 Pa·s.

[0042] The viscosity of the low vinyl silicone oil at room temperature is 3000 - 3500 mPa·s, and the vinyl content is 1.2 - 2 wt%; the viscosity of the liquid silicone resin is 10000 - 15000 mPa·s, and the solid-liquid content ratio is 0.6 - 0.7.

[0043] The dispersant is a DA-type dispersant, and the mass portion of the dispersant is 3 parts.

[0044] Example 3:

[0045] A liquid silicone rubber coating, by mass portion, comprises the following components:

[0046] 6 parts by mass of high vinyl silicone oil, 10 parts by mass of silicone rubber emulsion, 20 parts by mass of low vinyl silicone oil, 35 parts by mass of liquid silicone resin, 11 parts by mass of fumed silica, 2.2 parts by mass of hexamethyldisilazane, 15 parts of styrene-butadiene thermoplastic elastomer, 2 parts of diatomite, 2 parts of aromatic hydrocarbon solvent, 0.1 part of ultraviolet absorber, 1 part of mildew and bactericide, 5 parts of defoamer, 0.1 part of leveling agent, 2 parts of coupling agent and a dispersant.

[0047] The viscosity of the high vinyl silicone oil at room temperature is 2500 - 3500 mPa·s, and the vinyl content is 5 - 8 wt%.

[0048] The defoamer is a silicone defoamer; the coupling agent is 3-aminopropyltrimethoxysilane.

[0049] The silicone rubber emulsion is subjected to high-temperature vulcanization treatment.

[0050] The specific surface area of the fumed silica is 150 - 200 m² / g; the viscosity of hexamethyldisilazane at room temperature is 15 Pa·s.

[0051] The viscosity of the low vinyl silicone oil at room temperature is 3000 - 3500 mPa·s, and the vinyl content is 1.2 - 2 wt%; the viscosity of the liquid silicone resin is 10000 - 15000 mPa·s, and the solid-liquid content ratio is 0.6 - 0.7.

[0052] The dispersant is a DA-type dispersant, and the mass portion of the dispersant is 1 part.

[0053] Example 4:

[0054] A liquid silicone rubber coating, by mass portion, comprises the following components:

[0055] 10 parts by mass of high vinyl silicone oil, 15 parts by mass of silicone rubber emulsion, 25 parts by mass of low vinyl silicone oil, 40 parts by mass of liquid silicone resin, 13 parts by mass of fumed silica, 2.5 parts by mass of hexamethyldisilazane, 18 parts of styrene-butadiene thermoplastic elastomer, 3 parts of diatomite, 4 parts of aromatic solvent, 0.2 parts of ultraviolet absorber, 3 parts of mildew and bactericide, 8 parts of defoamer, 0.5 parts of leveling agent, 3 parts of coupling agent and dispersant.

[0056] The viscosity of the high vinyl silicone oil at room temperature is 2500 - 3500 mPa·s, and the vinyl content is 5 - 8 wt%.

[0057] The defoamer is a silicone defoamer; the coupling agent is 3-aminopropyltrimethoxysilane.

[0058] The silicone rubber emulsion is subjected to high-temperature vulcanization treatment.

[0059] The specific surface area of the fumed silica is 150 - 200 m² / g; the viscosity of hexamethyldisilazane at room temperature is 15 Pa·s.

[0060] The viscosity of the low vinyl silicone oil at room temperature is 3000 - 3500 mPa·s, and the vinyl content is 1.2 - 2 wt%; the viscosity of the liquid silicone resin is 10000 - 15000 mPa·s, and the solid-liquid content ratio is 0.6 - 0.7.

[0061] The dispersant is a DA-type dispersant, and the mass fraction of the dispersant is 1.5 parts.

[0062] Example 5:

[0063] A liquid silicone rubber coating, by mass, comprises the following components:

[0064] 10 parts by mass of high vinyl silicone oil, 18 parts by mass of silicone rubber emulsion, 32 parts by mass of low vinyl silicone oil, 45 parts by mass of liquid silicone resin, 13 parts by mass of fumed silica, 3.2 parts by mass of hexamethyldisilazane, 23 parts of styrene-butadiene thermoplastic elastomer, 4 parts of diatomite, 3 parts of aromatic solvent, 0.2 parts of ultraviolet absorber, 4 parts of mildew and bactericide, 8 parts of defoamer, 0.8 parts of leveling agent, 3 parts of coupling agent and dispersant.

[0065] The viscosity of the high vinyl silicone oil at room temperature is 2500 - 3500 mPa·s, and the vinyl content is 5 - 8 wt%.

[0066] The defoamer is a silicone defoamer; the coupling agent is 3-aminopropyltrimethoxysilane.

[0067] The silicone rubber emulsion is subjected to high-temperature vulcanization treatment.

[0068] The specific surface area of the fumed silica is 150 - 200 m² / g; the viscosity of hexamethyldisilazane at room temperature is 15 Pa·s.

[0069] The viscosity of the low vinyl silicone oil at room temperature is 3000 - 3500 mPa·s, and the vinyl content is 1.2 - 2 wt%; the viscosity of the liquid silicone resin is 10000 - 15000 mPa·s, and the solid-liquid content ratio is 0.6 - 0.7.

[0070] The dispersant is a DA type dispersant, and the mass fraction of the dispersant is 1.5 parts.

[0071] A preparation method of a liquid silicone rubber coating, comprising the following working steps:

[0072] First step: Ensure that all raw materials are accurately weighed according to the formula; prepare a reaction vessel, a stirring device and a heating / cooling system; the reaction vessel is a glass or stainless steel reaction vessel, ensuring that the vessel has sufficient capacity to accommodate all raw materials; the stirring device is a stirring device equipped with high shear force, including but not limited to a high-speed stirrer or a three-dimensional mixer to ensure thorough mixing; the heating / cooling system includes but not limited to an electric heater and a water circulation cooling system;

[0073] Second step: Subject the silicone rubber emulsion to high-temperature vulcanization treatment; use a high-temperature vulcanization tank or a vulcanization furnace to ensure that the vulcanization treatment of the silicone rubber emulsion can be carried out in a controlled high-temperature environment; put the silicone rubber emulsion into the vulcanization tank, set appropriate temperature and time for vulcanization treatment to ensure that the silicone rubber emulsion obtains the required properties;

[0074] Third step: Mix the silicone oil and the liquid silicone resin; use a high-shear stirring device to sequentially add high vinyl silicone oil, low vinyl silicone oil and liquid silicone resin; stir to make them uniformly mixed to ensure a homogeneous liquid mixture; then add other coating components; add fumed silica, hexamethyldisilazane, styrene-butadiene thermoplastic elastomer, diatomaceous earth, aromatic hydrocarbon solvent, ultraviolet absorber, mildew and bactericide, defoamer, leveling agent, coupling agent and dispersant one by one; stir with a high-shear stirring device after each addition to ensure uniform dispersion of each component;

[0075] Fourth step: Adjust the viscosity and solid-liquid content; gradually add adjusters such as diluents or thickeners as needed to adjust the viscosity and solid-liquid content of the coating; detect the viscosity and solid-liquid content to ensure compliance with product specifications;

[0076] Fifth step: Final adjustment and inspection; conduct final adjustment, such as adjusting the pH value, viscosity, etc. to meet the final requirements of the coating; packaging and storage; automatically package the finally prepared liquid silicone rubber coating and store it under appropriate conditions to ensure that the coating quality is not affected.

[0077] The liquid silicone rubber coating of this solution has high wear resistance and elasticity, which is provided by the styrene-butadiene thermoplastic elastomer component, making the coating have excellent wear resistance and elasticity and being suitable for a variety of application environments; the liquid silicone rubber coating of the solution has the functions of weather resistance and ultraviolet protection, contains ultraviolet absorbers, can improve the weather resistance of the coating and the resistance to ultraviolet rays, and extend the service life.

[0078] In the preparation process of the liquid silicone rubber coating of this solution, by adjusting the components such as silicone oil and liquid silicone resin in the coating, the viscosity and solid-liquid content can be easily adjusted to meet different application requirements.

[0079] The silicone rubber emulsion in the liquid silicone rubber coating of this solution is subjected to high-temperature vulcanization treatment, which can improve the performance of the silicone rubber and make it more suitable for specific industrial applications; the high-temperature vulcanization treatment of the silicone rubber emulsion helps to optimize its performance and improve wear resistance and weather resistance.

[0080] Organosilicon defoamers and leveling agents are added to the liquid silicone rubber coating of this solution, which helps to prevent the generation of bubbles, improve the flatness of the coating surface, and improve the coating effect; the liquid silicone rubber coating of this solution uses silicone rubber emulsion and environment-friendly mildew-proof and bactericidal agents, which helps to improve the environmental protection of the coating and meet modern environmental protection standards.

[0081] It can be understood that the present invention is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present invention, various changes or equivalent replacements can be made to these features and embodiments. In addition, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A liquid silicone rubber coating, characterized in that, by mass parts, it comprises the following components: 6 - 15 mass parts of high vinyl silicone oil, 10 - 25 mass parts of silicone rubber emulsion, 20 - 35 mass parts of low vinyl silicone oil, 35 - 50 mass parts of liquid silicone resin, 11 - 14 mass parts of fumed silica, 2.2 - 3.5 mass parts of hexamethyldisilazane, 15 - 25 parts of styrene-butadiene thermoplastic elastomer, 2 - 5 parts of diatomite, 2 - 5 parts of aromatic solvent, 0.1 - 0.3 parts of ultraviolet absorber, 1 - 5 parts of mildew and bactericide, 5 - 10 parts of defoamer, 0.1 - 1 part of leveling agent, 2 - 4 parts of coupling agent and dispersant.

2. The liquid silicone rubber coating according to claim 1, characterized in that, the viscosity of the high vinyl silicone oil at room temperature is 2500 - 3500 mPa·s, and the vinyl content is 5 - 8 wt%.

3. The liquid silicone rubber coating according to claim 1, characterized in that, the defoamer is an organosilicon defoamer; the coupling agent is 3-aminopropyltrimethoxysilane.

4. The liquid silicone rubber coating according to claim 1, characterized in that, the silicone rubber emulsion is subjected to high-temperature vulcanization treatment.

5. The liquid silicone rubber coating according to claim 1, characterized in that, the specific surface area of the fumed silica is 150 - 200 m² / g; the viscosity of hexamethyldisilazane at room temperature is 15 Pa·s.

6. The liquid silicone rubber coating according to claim 1, characterized in that, the viscosity of the low vinyl silicone oil at room temperature is 3000 - 3500 mPa·s, and the vinyl content is 1.2 - 2 wt%; the viscosity of the liquid silicone resin is 10000 - 15000 mPa·s, and the solid-liquid content ratio is 0.6 - 0.

7.

7. The liquid silicone rubber coating according to claim 1, characterized in that, the dispersant is a DA-type dispersant, and the mass parts of the dispersant are 1 - 3 parts.

8. A preparation method of a liquid silicone rubber coating, characterized in that, it comprises the following working steps: The first step: Ensure that all raw materials are accurately weighed according to the formula; prepare a reaction vessel, a stirring device and a heating / cooling system; the reaction vessel is a glass or stainless steel reaction vessel, ensure that the vessel has sufficient capacity to accommodate all raw materials; the stirring device is a stirring device equipped with high shear force, including but not limited to a high-speed stirrer or a three-dimensional mixer, to ensure sufficient mixing; the heating / cooling system includes but not limited to an electric heater and a water circulation cooling system; The second step: Subject the silicone rubber emulsion to high-temperature vulcanization treatment; use a high-temperature vulcanization tank or a vulcanizing furnace to ensure that the vulcanization treatment of the silicone rubber emulsion can be carried out in a controlled high-temperature environment; put the silicone rubber emulsion into the vulcanization tank, set appropriate temperature and time, and carry out vulcanization treatment to ensure that the silicone rubber emulsion obtains the required properties; Step 3: Mix the silicone oil and liquid silicone resin; Using a high-shear stirring device, sequentially add high vinyl silicone oil, low vinyl silicone oil, and liquid silicone resin; Under stirring, make them uniformly mixed to ensure a homogeneous liquid mixture; Then add other coating components; Sequentially add fumed silica, hexamethyldisilazane, styrene-butadiene thermoplastic elastomer, diatomaceous earth, aromatic solvents, ultraviolet absorbers, mildew and bactericide, defoamer, leveling agent, coupling agent, and dispersant; After each addition, stir through the high-shear stirring device to ensure uniform dispersion of each component; Step 4: Adjust the viscosity and solid-liquid content; As needed, gradually add regulators such as diluents or concentrates to adjust the viscosity and solid-liquid content of the coating; Conduct viscosity and solid-liquid content tests to ensure compliance with product specifications; Step 5: Final adjustment and inspection; Conduct final adjustments, such as adjusting the pH value, viscosity, etc., to meet the final requirements of the coating; Packaging and storage; Automatically package the finally prepared liquid silicone rubber coating and store it under appropriate conditions to ensure that the coating quality is not affected.