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Condensation reaction polysiloxane composition and cured product

A condensation reaction, polysiloxane technology, applied in the field of condensation reaction type polysiloxane compositions and cured products, can solve the problems of insufficient heat resistance, curing obstacles of platinum catalysts, etc. The effect of good heat resistance and transparency, and excellent storage stability

Active Publication Date: 2020-11-03
PELNOX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the addition reaction, there is a problem that the curing disorder is easily caused by deactivation of the platinum catalyst, moisture in the use environment, etc.
In this regard, the condensation-reaction type polysiloxane composition described in Patent Document 1 contains an acrylic resin as the main component and has insufficient heat resistance.

Method used

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  • Condensation reaction polysiloxane composition and cured product
  • Condensation reaction polysiloxane composition and cured product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0088] Hereinafter, although an Example and a comparative example demonstrate this invention in detail, the scope of this invention is not limited to these. In addition, in each example, unless otherwise indicated, a part is based on mass.

[0089] In the production example, the weight-average molecular weight was obtained based on gel permeation chromatography (device used: HLC-8220 manufactured by Tosoh Corporation, column: TSKgelα-M manufactured by Tosoh Corporation, developing solvent: tetrahydrofuran) The conversion value of the polystyrene standard substance.

[0090] In the manufacturing example, 1 The displacement value of H-NMR is obtained by using VARIAN 400-MR (400MHz, CDCl 3 ) to obtain the measured value.

[0091] In Examples, the viscosity is a measured value obtained by using an E-type viscometer (product name "RE-80U", manufactured by Toki Sangyo Co., Ltd., rotor number 1°34'×R24, rotor speed 5 rpm).

[0092]

manufacture example 1

[0094] 136.2 parts of methyltrimethoxysilane and 10.8 parts of water were added to a reaction device equipped with a stirrer, a condenser, a thermometer and a nitrogen gas introduction pipe, and the temperature of the reaction system was raised to 40°C. Next, 0.14 parts of formic acid was added to initiate the hydrolysis reaction. After the start of the reaction, the temperature of the reaction system reached 62° C. due to the heat of reaction, but thereafter the temperature was lowered to 40° C., and this temperature was maintained for 30 minutes. Thereafter, the temperature of the reaction system was raised to 120° C. over 3 hours while removing accompanying methanol from the system. Next, by carrying out a condensation reaction at this temperature for 1 hour, the 3 SiO 3 / 2 The liquid polysilsesquioxane (B-1) of the silsesquioxane group unit (x=1, y=0) shown. (B-1) The viscosity of the component was 20 mPa·s / 25 degreeC, and the weight average molecular weight was 900. In...

manufacture example 2

[0096] The input amount of water is set as 16.2 parts, except that, operate in the same manner as in Production Example 1, obtain 3 SiO 3 / 2 A liquid polysilsesquioxane (B-2) having a silsesquioxane group unit (x=1, y=0) represented. The component (B-2) had a viscosity of 350 mPa·s / 25° C., a weight average molecular weight of 2500, a residual methoxy group content of about 24% by weight, and no residual hydroxyl group peak was observed.

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Abstract

The objective of the present invention is to provide a condensation reaction-type silicone composition which has excellent initial curability and provides a cured product that exhibits adhesion with excellent toughness, while having good cracking resistance, void resistance and heat resistance. The present invention is a condensation reaction-type silicone composition that contains (A) a polysilsesquioxane which contains a trisiloxy unit (TA) represented by R1SiO3 / 2 (wherein R1 represents an alkyl group having 1-15 carbon atoms, or the like) and a hydroxyl group, and which is in a solid state at room temperature, (B) a polysilsesquioxane which contains a trisiloxy unit (TB) represented by R2SiO3 / 2 (wherein R2 represents an alkyl group having 1-15 carbon atoms, or the like) and an -OR2 group (wherein R2 represents an alkyl group having 1-15 carbon atoms, or the like), and which is in a liquid state at room temperature, and (C) a condensation reaction catalyst.

Description

technical field [0001] The invention relates to a condensation reaction polysiloxane composition and a cured product. Background technique [0002] A polysiloxane resin is generally a cured product obtained by curing polysiloxanes (polyorganosiloxanes) together, and condensation reaction and addition reaction are known as the curing reaction. [0003] Addition reaction is: make Si-CH=CH in the presence of platinum catalyst 2 The hydrosilylation reaction of the polysiloxane with the alkenyl silyl group and the polysiloxane with the hydrosilyl group (Si-H). The addition reaction produces the target cured product in a relatively short period of time even at room temperature, and thus is advantageous from the viewpoint of productivity. However, in the addition reaction, there is a problem that curing failure is likely to occur due to deactivation of the platinum catalyst, moisture in the use environment, and the like. [0004] The condensation reaction is to dehydrate and con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08G77/14C08K5/5419
CPCC08G77/14C08K5/5419C08L83/04C08K3/013
Inventor 佐藤宪一郎矢口雄太小川雄史
Owner PELNOX
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