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Novel photoactivatable system for inhibiting hydrosilylation

A technology of inhibitor and polysiloxane, which is applied in the direction of coating, etc., can solve the problems of slow curing rate, reduced coating rate, strong inhibition of hydrosilylation catalyst, etc.

Active Publication Date: 2016-09-28
BLUESTAR SILICONES FRANCE SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this, it may be necessary to use large amounts of inhibitors, which leads to a strong inhibition of the hydrosilylation catalyst
The consequence of this is that the curing rate of the composition is slow even after activation, which is a great disadvantage from an industrial point of view, since this especially has to reduce the coating rate and thus the production rate

Method used

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  • Novel photoactivatable system for inhibiting hydrosilylation
  • Novel photoactivatable system for inhibiting hydrosilylation
  • Novel photoactivatable system for inhibiting hydrosilylation

Examples

Experimental program
Comparison scheme
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Embodiment approach

[0103] Preferably, the polyorganosiloxanes A according to the invention carry at least two alkenyl groups bonded to silicon atoms. According to a preferred embodiment, this polyorganosiloxane A comprises:

[0104] (i) at least two units of formula (A1)

[0105] Y a Z b SiO (4-(a+b) / 2 (A1)

[0106] in:

[0107] -Y represents a monovalent group comprising 2 to 12 carbon atoms having at least one olefinic function and optionally at least one heteroatom,

[0108] -Z represents a monovalent group containing 1-20 carbon atoms without an alkene or alkyne functional group;

[0109] - a and b represent integers, a is 1, 2 or 3, b is 0, 1 or 2 and (a+b) is 1, 2 or 3;

[0110] (ii) and optionally other units of formula (A2):

[0111] Z c SiO (4-c) / 2 (A2)

[0112] in:

[0113] -Z has the same meaning as above, and

[0114] -c represents an integer of 0-3.

[0115] It is to be understood that in formula (A1) above as well as formula (A2), if there are multiple Y and Z group...

Embodiment

[0197] Reagents used:

[0198] POS Vi A: Chain-end vinylated polydimethylsiloxane oil having the average formula M vi D. 75 m vi and dynamic viscosity at 25°C = 100mPa.s, where M Vi =(CH 3 ) 2 (Vinyl)SiO 1 / 2 and D=(CH 3 ) 2 SiO 2 / 2 .

[0199] POS H B: polymethylhydrogensiloxane oil with trimethylsilyl terminations, having the average formula M 2 D' 45 And the dynamic viscosity at 25°C is 20mPa.s, where M=(CH 3 ) 3 SiO 1 / 2 and D'=H(CH 3 ) 1 SiO 2 / 2 .

[0200] Catalyst C: solution of platinum 0 with divinyltetramethyldisiloxane ligands diluted in silicone oil, in which the content of the element Pt is 2800 ppm by mass.

[0201] Inhibitor D: 1-ethynyl-1-cyclohexanol (ECH), which is a true (vrai) α-acetylenic alcohol.

[0202] Photoinitiator E:

[0203] - Omnirad 102, marketed by the company IGM Resins: 2-Hydroxy-2-methyl-1-(4-tert-butyl)phenylacetone (type I photoinitiator);

[0204] - TZT, marketed by the company Lamberti: a mixture of 4-methylbenzophe...

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Abstract

The present invention relates to a hardenable silicone composition including an irradiation-activated system for temporarily inhibiting the hydrosilylation reaction. Said system includes at least one inhibitor selected from among alpha-acetylenic alcohols, alpha-alpha'-acetylenic diesters, conjugated ene-yne compounds, alpha-acetylenic ketones, acrylonitriles, maleates, fumarates, the mixture thereof, at least one photoinitiator, and tris(trimethylsilyl)silane (TTMSS). The invention also relates to a method for preparing a silicone coating and hard elastomer materials provided comprising said silicone composition.

Description

technical field [0001] The invention belongs to the technical field of organosilicon composition preparation. More particularly, the present invention relates to curable silicone compositions comprising novel systems for inhibiting hydrosilylation reactions. Background technique [0002] Hydrosilylation, also known as polyaddition, is an important reaction in the field of silicones. [0003] During the hydrosilylation reaction, a compound comprising at least one degree of unsaturation is reacted with a compound comprising at least one hydrogen atom bonded to a silicon atom. This reaction can be described, for example, by the following reaction equation: Reaction equation (1) in the case of ethylenic unsaturation: [0004] (1) [0005] Or reaction equation (2) in the case of alkyne-type unsaturation: [0006] (2) [0007] Hydrosilylation thus enables on the one hand to obtain functionalized silanes or siloxanes and on the other hand to form by crosslinking between po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C08G77/12C08G77/20C08L83/04
CPCC08G77/12C08G77/20C08L83/04C08K5/005C08K5/05C08K5/10C08K5/14C08K5/5403C08L83/00C09D183/04C08J3/28C08J2383/07C08J2483/05C08L2205/025
Inventor E·普盖G·皮布利S·马罗
Owner BLUESTAR SILICONES FRANCE SAS
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