High-refractive-index transparent silica gel as well as preparation method and application thereof

Abstract

The invention provides high-refractive-index transparent silica gel. The high-refractive-index transparent silica gel comprises a component A and a component B in a mass ratio of (0.8-1.2): 1, whereinthe component A comprises the following components in parts by weight: 1-100 parts of phenyl vinyl-terminated silicone oil; 1-100 parts by weight of phenyl terminal side chain vinyl silicone oil; and0.01 to 0.3 part by weight of a platinum catalyst; the component B comprises the following components in parts by weight: 1-100 parts of phenyl vinyl-terminated silicone oil; 1-100 parts by weight ofphenyl terminal side chain vinyl silicone oil; 1-60 parts by weight of a biphenyl hydrogen-containing chain extender; 0-5 parts by weight of a phenyl hydrogen-containing cross-linking agent; 0.2-10 parts by weight of a phenyl tackifier; 0-0.4 part by weight of an inhibitor; the phenyl vinyl-terminated silicone oil has a general formula as shown in formula (I), and the phenyl terminal side chain vinyl silicone oil has a general formula shown in formula (II). The high-refractive-index transparent silica gel provided by the invention adopts specific content components to realize better interaction, so that the product refractive index is high, and meanwhile, high refractive index and high temperature stability are achieved, good adhesion performance on various base materials is achieved, andthe high-refractive-index transparent silica gel is suitable for optical packaging and potting in various occasions.

Description

technical field [0001] The invention relates to the technical field of silicone gel, and more specifically relates to a transparent silicone gel with high refractive index and its preparation method and application. Background technique [0002] Silicone gel is a kind of soft material, which is elastic after curing, can form a buffer and can repair itself, has good flow wettability, low curing shrinkage, no by-products, no corrosion, and has good weather resistance properties, high temperature stability and optical properties, widely used in electronic and electrical fields, such as device sealing and coating protection, especially the packaging and potting of precision components, and can also be used for lens filling, bonding ITO film, glass, PC board , PMMA, etc., play the role of moisture-proof, dust-proof, corrosion-proof and shock-proof. [0003] In the current published reports, most of the silicone gels are methyl silicone gels with a refractive index of about 1.41....

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Problems solved by technology

And the report of high-refractive index silicone gel is also relatively few, as the Chinese patent of publication number CN104262969A discloses a kind of single-pack silicone gel encapsulant and preparation method that high-power white light LED is used, with phenyl content 30-40% One-component silicone gel prepared by mixing self-crosslinking phenyl silicone resin, catalyst, inhibitor and tackifier. Although one-component silicone gel is more convenient to use, it cannot avoid long-term The slow reaction during storage, or the environment that inhibits the reaction consumes extra energy. At the same time, there is a problem of difficult control in the preparation process of self-crosslinking phenyl silicone resin, which is easy to affect the transparency of the product, and because no long-chain silicone oil is used, this The silicone gel prepared by the method has the situation that the needle penetration is too low and the toughness is not high to a large extent; Another example is that the Chinese patent with the publication number CN110272627A has a viscosity of 1mPa·s-20000mPa·s and a vinyl content of 0.01%-6 % Vinyl-terminated phenyl-containing silicone oil, hydrogen-terminated phenylhydrogen-containing silicone oil containing at least three silicon-hydrogen bonds in a hydrogen content of 0.01%-2%, at least one silicon hydrogen-containing silicone oil in a hydrogen content of 0.01%-2% Bonded phenyl hydrogen-containing silicone oil, inhibitor, and platinum catalyst are mixed to obtain a high-refractive index silicone gel, but there is no component with a higher refractive index (above 1.54) that can significantly increase the refractive index in the raw material of the phenyl silicone oil used. The refractive index of the obtained silica gel is mainly between 1.50-1.52, and at the same time, there is no component that increases the bonding effect in the disclosed formula. Since the adhesion effect of silica gel to the substrate is mainly due to physical adsorption, the force is relatively strong. weak

To sum up, the existing silicone gel has low refractive index, and high refractive index can easily lead to low light transmittance and general adhesion performance.

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