UV organosilicon coating adhesive and preparation method thereof

Abstract

The invention discloses a UV (ultraviolet) organic silicon coating adhesive and a preparation method thereof, and relates to the field of UV organic silicon coating adhesives. An ultraviolet curing agent; a solvent; the organic silicon resin is polydimethylsiloxane, cyclic siloxane or a mixture thereof, the ultraviolet curing agent is at least one photoinitiator, the photoinitiator is selected from styrene, aromatic aldehydes, polymeric photoinitiators or a mixture thereof, the solvent is alcohol, organic solvent or a mixture thereof, and the additive is one or more additives. The prepared UV organic silicon coating adhesive can be rapidly cured, the coating adhesive can be cured within 10 seconds under the irradiation of UV light, the production efficiency is greatly improved, and the coating adhesive has excellent environmental protection property: low-organic-solvent configuration is adopted, the release of volatile organic compounds is reduced, the environmental protection requirement is met, and the environmental protection property is improved. The cured coating has excellent chemical resistance, high temperature resistance, weather resistance and excellent adhesive force.

Description

Technical Field

[0001] The invention relates to the field of UV organosilicon coating adhesive, in particular to a UV organosilicon coating adhesive and a preparation method thereof. Background Art

[0002] In recent years, with the rapid development of industrial and consumer electronic products, the performance requirements for coating materials have been continuously improved. Especially in the electronics industry, the reliability and durability of electronic components in harsh environments such as high temperature, humidity and chemical corrosion are particularly important. Therefore, the development of coating materials with excellent high temperature resistance, moisture resistance and chemical corrosion resistance has become an important topic in scientific research and industry.

[0003] Silicone coatings are increasingly being used in various fields due to their unique advantages. First, silicone materials have excellent high temperature resistance, and their stable molecular structure can maintain physical and chemical properties in high temperature environments. Second, silicone has good weather resistance and UV resistance, which can effectively prevent aging and damage to the surface of objects. However, existing silicone coatings usually need to be cured at higher temperatures, and the curing process often takes a long time, increasing production costs and time. Especially in a fast production environment, traditional curing methods are difficult to meet the needs of production efficiency.

[0004] In order to meet the above challenges, ultraviolet (UV) curing technology has gradually received widespread attention. UV curing has the advantages of being fast and environmentally friendly. The coating can be cured in seconds by ultraviolet light irradiation. Compared with traditional methods, UV curing can significantly reduce energy consumption and production cycle, and reduce the requirements for equipment. Related research shows that silicone coatings using UV curing can increase the curing speed while maintaining excellent performance, thereby improving production efficiency.

[0005] Existing UV-curing silicone coatings still have limitations in formula design and application. Most UV silicone coatings on the market currently have low solid content, and their performance is not stable enough after curing. They are prone to problems such as poor adhesion, low surface hardness, and insufficient chemical resistance. In addition, existing UV silicone coatings have inconsistent performance in terms of bonding with different substrates, which limits their scope of application.

[0006] Therefore, it is of great practical significance to develop a UV silicone coating adhesive with high solid content, excellent mechanical properties and good adhesion, which can not only cure quickly but also effectively improve the overall performance of the coating. Summary of the invention

[0007] The purpose of the present invention is to provide a UV silicone coating adhesive and a preparation method thereof.

[0008] To achieve the above object, the present invention provides the following technical solution: a UV organic silicon coating adhesive, composed of the following components: organic silicon resin; ultraviolet curing agent; solvent; additives.

[0009] Preferably, the silicone resin is polydimethylsiloxane, cyclic siloxane or a mixture thereof.

[0010] Preferably, the UV curing agent is at least one photoinitiator, and the photoinitiator is selected from styrene-based, aromatic aldehydes, polymeric photoinitiators or mixtures thereof.

[0011] Preferably, the solvent is an alcohol, an organic solvent or a mixture thereof.

[0012] Preferably, the additive is a thickener, a leveling agent, a defoaming agent or a combination thereof, the leveling agent is acrylic or polyurethane, and the thickener is an acrylic thickener.

[0013] Preferably, the silicone resin is modified polydimethylsiloxane, and its modified component contains fluorine or hydrocarbon functional groups to enhance its chemical resistance and hydrophobicity.

[0014] A method for preparing a UV organic silicone coating adhesive, characterized in that it comprises the following steps:

[0015] S1, mixing the silicone resin and the solvent, and stirring at room temperature until uniform;

[0016] S2. Slowly add the UV curing agent under stirring, and continue stirring until it is completely dispersed;

[0017] S3, then add the additives and continue stirring until all ingredients are uniform;

[0018] S4. Filter the mixture to remove undissolved particles and bubbles, thereby obtaining the final UV silicone coating adhesive.

[0019] Preferably, the mixing time in step S1 is 30 minutes to 2 hours, and the temperature of the ultraviolet curing agent in step S2 is 20° C. to 30° C.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The prepared UV silicone coating adhesive can be cured quickly: under UV light, the coating adhesive can be cured within 10 seconds, greatly improving production efficiency, and has excellent environmental protection: it adopts a low organic solvent configuration to reduce the release of volatile organic compounds, meets environmental protection requirements, and has excellent performance: the cured coating has excellent chemical resistance, high temperature resistance, weather resistance and excellent adhesion. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] Provided is a UV organic silicon coating adhesive, which consists of the following components: organic silicon resin; ultraviolet curing agent; solvent; and additives.

[0024] Wherein, the organic silicone resin is polydimethylsiloxane, cyclic siloxane or a mixture thereof, and the solid content of the organic silicone resin is 10% to 50% (mass fraction);

[0025] The UV curing agent is at least one photoinitiator, and the photoinitiator is selected from styrene, aromatic aldehydes, polymeric photoinitiators or mixtures thereof, and the amount of the UV curing agent added is 1% to 10% (mass fraction) of the mass of the silicone resin;

[0026] The solvent is alcohol, organic solvent or a mixture thereof, and the evaporation rate of the solvent is 0.1 to 1.5 g / cm per hour. 2 ;

[0027] The additive is a thickener, a leveling agent, a defoamer or a combination thereof, the leveling agent is acrylic acid or polyurethane, the thickener is an acrylic ester thickener, and the addition amount of the thickener is 0.1% to 5% (mass fraction);

[0028] The silicone resin is a modified polydimethylsiloxane, and its modified component contains fluorine or hydrocarbon functional groups to enhance its chemical resistance and hydrophobicity.

[0029] The following is a detailed description

[0030] This embodiment provides a UV silicone coating adhesive, which is composed of the following components:

[0031] Silicone resin: polydimethylsiloxane (PDMS) is selected, and the solid content is 30%.

[0032] UV curing agent: Phenyl vinyl ether photoinitiator is selected with a solid content of 2%.

[0033] Solvent: Use isopropyl alcohol as solvent to ensure a faster evaporation rate.

[0034] Additives: The thickener is a polyurethane thickener, and the leveling agent is an acrylic leveling agent.

[0035] A method for preparing a UV organic silicone coating adhesive, the specific process is: mixing PDMS and isopropyl alcohol in a stirrer, stirring for 30 minutes to 2 hours until uniform;

[0036] Add phenyl vinyl ether, wherein the temperature of the UV curing agent is 20°C to 30°C, and continue stirring for 30 minutes to fully disperse it;

[0037] Gradually add the polyurethane thickener and acrylic leveling agent, and continue stirring to ensure that all ingredients are evenly distributed;

[0038] The mixture was filtered to remove undissolved particles to obtain a transparent UV silicone coating adhesive.

[0039] The prepared coating glue is applied to a glass plate and cured within 10 seconds after irradiation with a UV lamp (wavelength of 365nm). After curing, its adhesion is verified by tensile test and peel test. The results show that its adhesion exceeds 5MPa, which meets the application requirements.

[0040] The prepared UV silicone coating adhesive can be cured quickly: under UV light, the coating adhesive can be cured within 10 seconds, greatly improving production efficiency, and has excellent environmental protection: it adopts a low organic solvent configuration to reduce the release of volatile organic compounds, meets environmental protection requirements, and has excellent performance: the cured coating has excellent chemical resistance, high temperature resistance, weather resistance and excellent adhesion.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A UV silicone coating adhesive, characterized in that: It is composed of the following ingredients: silicone resin; ultraviolet curing agent; solvent; additives.

2. The UV organic silicone coating adhesive according to claim 1, characterized in that: The organic silicone resin is polydimethylsiloxane, cyclic siloxane or a mixture thereof.

3. The UV organic silicone coating adhesive according to claim 1, characterized in that: The ultraviolet curing agent is at least one photoinitiator, and the photoinitiator is selected from styrene-based, aromatic aldehydes, polymeric photoinitiators or a mixture thereof.

4. The UV organic silicone coating adhesive according to claim 1, characterized in that: The solvent is alcohol, organic solvent or a mixture thereof.

5. The UV organic silicone coating adhesive according to claim 1, characterized in that: The additive is a thickener, a leveling agent, a defoaming agent or a combination thereof, the leveling agent is acrylic acid or polyurethane, and the thickener is an acrylic ester thickener.

6. The UV organic silicone coating adhesive according to claim 1, characterized in that: The organic silicon resin is modified polydimethylsiloxane, and the modified component thereof contains fluorine or hydrocarbon functional groups to enhance its chemical resistance and hydrophobicity.

7. A method for preparing a UV organic silicone coating adhesive according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, mixing the silicone resin and the solvent, and stirring at room temperature until uniform; S2. Slowly add the UV curing agent under stirring, and continue stirring until it is completely dispersed; S3, then add the additives and continue stirring until all ingredients are uniform; S4. Filter the mixture to remove undissolved particles and bubbles, thereby obtaining the final UV silicone coating adhesive.

8. The method for preparing the UV organic silicone coating adhesive according to claim 7, characterized in that: The mixing time in step S1 is 30 minutes to 2 hours, and the temperature of the ultraviolet curing agent in step S2 is 20° C. to 30° C.