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Filled liquid silicone rubber matrix with improved color and reproducibility

A technology of liquid silicone rubber and hydrophobic filler, which is applied in thin material handling, transportation and packaging, and can solve the problems of reducing tensile strength and modulus

Active Publication Date: 2018-01-30
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of non-reactive silicones in masterbatches reduces the achievable tensile strength and modulus, and in some cases the non-reactive silicones may bleed or "bleed" from the cured product
This approach is therefore generally unacceptable for addition curable systems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Add 540kg to a stirred 1700 liter reactor with 300m 2 / g of BET surface area T30P fumed silica, 161 kg hexamethyldisilazane and 59 kg water purified by reverse osmosis. The temperature was kept low by external cooling while adding fumed silica in the range of about 45°C to 35°C. An exotherm was noted, which raised the temperature to about 55°C, and ammonia evolution was observed. 600 kg of 20,000 mPas of α,ω-vinyl terminated polydimethylmethicone (two terminal vinyl groups) were then added over a period of about 3.5 hours and the temperature dropped to about 40°C. The mixture is stirred vigorously and the temperature rises to about 95°C due to frictional heat from adding the filler to the vinyl polymer, at which point external heat is applied to raise the temperature to about 165°C, at which temperature the composition is maintained at about Five hours, during which time ammonia and water were removed by means of nitrogen sparging with the aid of a slightly reduced ...

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PUM

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Abstract

Liquid silicone rubber matrix polymer compositions with improved color are prepared by reacting fumed silica reinforcing filler with silazane, adding aliphatic Saturated silicone, heated above 80°C, followed by addition of additional aliphatically unsaturated silicone. The compositions have improved whiteness and color reproducibility.

Description

technical field [0001] The present invention relates to a liquid silicone rubber base composition comprising an organopolysiloxane having multiple aliphatic unsaturated functional groups and a fumed silica filler, in particular for the preparation in a reproducible manner of Method for Liquid Silicone Rubber Matrix Compositions. Background technique [0002] Liquid silicone rubber ("LSR") is now widely used in commercial applications, such as for molding films and objects, coatings, caulks, sealants, and the like. The LSR contains at least one organopolysiloxane bearing multiple aliphatic unsaturated groups such as vinyl, allyl, homol-enyl, (meth)acryloyl, ethynyl, and the like. In order to achieve high strength after cross-linking with solids, relatively large amounts of reinforcing fillers are added. The composition may also contain conventional components such as low molecular weight crosslinkers, adhesion promoters, dyes, pigments, and the like. [0003] The matrix po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/06C08G77/20C08K9/06
CPCC08G77/06C08G77/20Y10T428/2991Y10T428/2995Y10T428/2993C08K3/36C08K5/5445C08K9/06C08L83/04
Inventor H·林康
Owner WACKER CHEM GMBH
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