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Light-diffusing dimethyl silicone rubber composition and led light-diffusing molded article

A technology of silicone rubber and dimethylpolysiloxane, which is applied in the field of light diffusing dimethyl silicone rubber composition and LED light diffusing molded body, which can solve the problem of deterioration, lack of light scattering, and inability to Eliminate problems such as resins, and achieve excellent weather resistance and a wide operating temperature range

Inactive Publication Date: 2011-12-07
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, light-diffusing silicone rubber compositions using resin powders such as cross-linked polymethyl methacrylate, cross-linked polystyrene, and cross-linked methyl methacrylate-styrene copolymer are used as light-diffusing fine powder materials. , it is possible to obtain a light-diffusing resin molded product that can be used from a low temperature of about -60°C to a high temperature of about 200°C. Possibility of resin deterioration, discoloration (yellowing) and decrease in light transmittance
In addition, since the above-mentioned resin powder does not have rubber elasticity, when the rubber is elongated (forcibly stretched) and bent when the light-diffusing silicone rubber is molded, it cannot follow the deformation of the rubber, and light diffusion occurs. Gaps (cracks) between the resin and silicone rubber, or defects such as unstable light scattering
[0006] On the other hand, in the case of using dimethyl silicone fine particles as light-diffusing fine particles in the dimethyl silicone resin, although the above-mentioned deformability, heat resistance and light resistance are excellent, since both have the same refractive index resin, so there is a problem that the necessary light scattering cannot be obtained

Method used

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  • Light-diffusing dimethyl silicone rubber composition and led light-diffusing molded article
  • Light-diffusing dimethyl silicone rubber composition and led light-diffusing molded article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] In the kneadable dimethyl silicone rubber compound KE-571-U (manufactured by Shin-Etsu Chemical Co., Ltd., which is a transparent uncrosslinked dimethyl silicone rubber compound, the dimethyl silicone rubber compound with a degree of polymerization of about 5000 The specific surface area measured by the BET method is 200m 2 / g of dry silica and 10% by mass or less of dimethylorganosiloxane oligomers (silica dispersant) with a molecular weight of less than 700 and terminated by silanol groups at both ends, and the compound does not contain In 100 parts by mass of phenyl groups), add spherical phenylmethyl silicone rubber powder (powder powder) as a light diffusing agent with an average particle diameter of 5 μm, a phenyl group content of 30 mol%, a refractive index of 1.52, and a durometer A-type hardness of 30. A) 5.0 parts by mass and 500 ppm of LiN(SO 2 CF 3 ) 2 , and kneading and dispersing with a kneader to obtain a milky white light-diffusing dimethyl silicone r...

Embodiment 2

[0096] To 100 parts by mass of the light-diffusing dimethyl silicone rubber composition matrix of Example 1, 1.0 parts by mass of an organic peroxide-based vulcanizing agent C-8B (manufactured by Shin-Etsu Chemical Co., Ltd.) was added as a crosslinking agent , kneaded with two rolls, and press-molded in the same manner as in Example 1, and performed various measurements in the same manner as in Example 1 with the obtained cured sheet with a thickness of 2 mm.

Embodiment 3

[0098] In Example 1, the light diffusing agent (powder A) was reduced to 1 part by mass, and LiN(SO 2 CF 3 ) 2 , except that addition crosslinking was performed in the same manner as in Example 1 to produce a 2 mm sheet, and various measurements were performed.

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Abstract

The invention provides a light-diffusing dimethyl organic silicone rubber composition and an LED light-diffusing molding body for molding and solidifying the light-diffusing dimethyl organic silicone rubber composition. The light-diffusing dimethyl organic silicone rubber composition provides a condensate excellent in weatherability, light transmittance and light diffusing properties. The light-diffusing dimethyl organic silicone rubber composition is characterized in that 0.1 to 100 parts by mass of a light diffusion agent is added and dispersed in 100 parts by mass of translucent or semitransparent unlinked dimethyl silicone rubber composition so as to form the composition. The light diffusion agent is formed by organic silicone elastomer particles containing phenyl-containing siloxane units with the average particle diameter thereof to be 0.5 -100 mu m. The dimethyl silicone rubber composition comprises dimethyl polysiloxane, or dimethyl polysiloxane and an inorganic filler, or a wetting agent of the dimethyl polysiloxane and the inorganic filler.

Description

technical field [0001] The present invention relates to parts for the purpose of scattering LED light (for example, LED lighting covers, mobile phones, etc.) keys and backlights, silicone lenses for light collection or diffusion, LED chip encapsulation materials, etc.) light-diffusing dimethyl silicone rubber composition and LED light-diffusing molding formed by molding and curing the composition body. Background technique [0002] Hitherto, as light-diffusing resin compositions, thermoplastic binder resins such as (meth)acrylic resins, polycarbonate-based resins, polyester-based resins, and polyurethane-based resins or rings having high transparency have been used. Oxygen resin, urea-formaldehyde resin, silicone resin, fluororesin, etc. are added or dispersed with inorganic particles such as calcium carbonate, barium sulfate, aluminum hydroxide, titanium dioxide, glass, etc., but the total light transmittance of the cured product is greatly reduced The problem. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04
Inventor 平林佐太央吉田政行井口良范
Owner SHIN ETSU CHEM IND CO LTD
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