Light-diffusing dimethyl silicone rubber composition

A technology of dimethyl silicone rubber and dimethyl polysiloxane, applied in the field of light-diffusing dimethyl silicone rubber composition, capable of solving narrow temperature range, reduced risk, lack of low temperature characteristics and heat resistance and other issues, to achieve the effect of a wide temperature range

Inactive Publication Date: 2016-04-06
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the binder resin of the conventional light-diffusing resin is a hard thermoplastic resin, and no resin using a soft rubber-like binder resin has been disclosed.
In the case of applying light-diffusing resin moldings containing hard resins to lighting fixtures or displays, the possibility of damage to the body due to impact cannot be denied, but as long as the light-diffusing resins containing silicone rubber Formed objects, the risk is greatly reduced
[0005] In addition, thermoplastic resins conventionally used as binder resins for light-diffusing resins have the following disadvantages: low-temperature characteristics and heat resistance are lacking, and the usable temperature range is narrow.

Method used

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  • Light-diffusing dimethyl silicone rubber composition
  • Light-diffusing dimethyl silicone rubber composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] As a transparent non-crosslinked dimethyl silicone rubber compound, in the kneading type dimethyl silicone rubber mixture KE-571-U (made by Shin-Etsu Chemical Co., Ltd. with a degree of polymerization of about 5000 dimethyl polysil The main component is oxane, and the specific surface area measured by the BET method is 200m 2 / g of dry silica containing 10% by mass or less of a dimethylsiloxane oligomer (silica dispersant) with a molecular weight of 700 or less whose ends are terminated by silanol groups, and which does not contain benzene in the compound Base) 5.0 parts by mass of solid glass beads with an average particle diameter of 5 μm (manufactured by Portables Baroteini Co., Ltd.) as a light diffusing agent were added, and kneaded, kneaded, and dispersed to obtain Milky white light diffusing silicone rubber composition base.

[0054] 0.5 / 2.0 parts by mass of addition (hydrosilylation) reaction system vulcanizing agent C-25A / C-25B (Shin-Etsu Chemical Industry ( ...

Embodiment 2

[0067] Add 1.0 parts by mass of organic peroxide-based vulcanizing agent C-8B (manufactured by Shin-Etsu Chemical Co., Ltd.) as a crosslinking agent to 100 parts by mass of the light-diffusing dimethyl silicone rubber composition matrix of Example 1 Kneading was carried out with twin rolls, and various measurements were performed in the same manner as in Example 1 using a cured sheet having a thickness of 2 mm obtained by press molding in the same manner as in Example 1.

Embodiment 3

[0069] In the silicone rubber composition of Example 1, LiN(SO 2 CF 3 ) 2 0.05 parts by mass of a 20% by mass adipate solution, and in the same manner as in Example 1, a 2 mm sheet was produced by addition crosslinking, and various measurements were performed.

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Abstract

Provided is a light diffusion dimethyl silicon rubber compound, characterized by comprising more than two alkenyls of each molecule bonding with two ends of a molecular chain and / or a silicon atom at the midway of the molecular chain, or a dimethyl polysiloxane having more than two hydroxys or alkoxys of each molecule capping two ends of the molecular chain, or a transparent / semitransparent non-cross-linked dimethyl silicon rubber coordination compound made of a dimethyl polysiloxane and a inorganic filler / a dimethyl polysiloxane, an inorganic filler, and a wetting agent, with 100 parts, by mass, of the coordination compound being added and dispersing the tiny glass beads having average grain diameter ranging from 1 to 150 microns to form 0.1 to 50 part, by mass, of the light diffusion dimethyl silicon rubber compound. The light diffusion dimethyl silicon rubber compound features excellent full light transmissivity, and light diffusion of the condensate. The product formed by this material is provided with flexibility of the silicon rubber and wide workable temperature range.

Description

technical field [0001] The present invention relates to a light-diffusing dimethyl silicone rubber composition, which is suitable for lighting covers, lighting billboards, backlight light diffusion plates or backlight light guide plates of liquid crystal displays, transmissive screens, etc. for the purpose of light diffusion part. Background technique [0002] Conventionally, thermoplastic adhesive resins such as (meth)acrylic resins, polycarbonate resins, polyester resins, and polyurethane resins or epoxy resins having high transparency have been used as light-diffusing resin compositions. Urea resin, silicone resin, fluororesin, etc. are added and dispersed inorganic fine particles such as calcium carbonate, barium sulfate, aluminum hydroxide, titanium dioxide, glass, etc., but the total light transmittance of the cured product is significantly lowered. . [0003] In addition, cross-linked polymethyl methacrylate, cross-linked polystyrene, cross-linked methyl methacrylat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08L83/06C08L83/05C08K5/14C08K3/36C08J3/24
Inventor 吉田政行
Owner SHIN ETSU CHEM CO LTD
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