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Hydrosilylation reaction inhibitors, and use thereof for preparing stable curable silicone compositions

A technology of hydrosilylation and hydropolysiloxane, which is applied in the directions of compositions for inhibiting chemical changes, chemical instruments and methods, synthetic resin layered products, etc., can solve problems such as unsatisfactory solutions, etc., Achieving the effect of large bath stability

Inactive Publication Date: 2014-04-09
BLUESTAR SILICONES FRANCE SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] It must therefore be pointed out that previous technical proposals do not provide a satisfactory solution to the problems raised above

Method used

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  • Hydrosilylation reaction inhibitors, and use thereof for preparing stable curable silicone compositions
  • Hydrosilylation reaction inhibitors, and use thereof for preparing stable curable silicone compositions
  • Hydrosilylation reaction inhibitors, and use thereof for preparing stable curable silicone compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] The inhibitor ECH (D1.I1) was pre-added to the vinylated dimethicone oil (A.1). After homogenization of the mixture, the polymethylhydrosiloxane oil (B.1) is introduced, then the amount of acid to be tested and finally the catalyst (C). The time required for crosslinking at ambient temperature (25°C) and 40°C is measured = bath application duration (durée de vie) at 25°C and 40°C. The results are reported in Table 1 below.

[0101] Table 1

[0102]

[0103] [H / vinyl] molar ratio = 1.8

[0104] It was observed that when the amount of platinum catalyst was 50 ppm relative to the total weight of the composition, the presence of variable amounts of methanesulfonic acid (D2.I1) was not able to obtain a satisfactory bath service duration, especially at 40 ℃.

Embodiment 2

[0106] The inhibitor ECH (D1.I1) was pre-added to the vinylated dimethicone oil (A.1). After homogenization of the mixture, polymethylhydridosiloxane oil (B.1) is introduced, followed by a fixed amount of 500 ppm (relative to the total weight of the composition) of the acid to be tested and finally a variable amount of catalyst (C) . Measure the time required for crosslinking at ambient temperature (25°C) and 40°C = bath application duration at 25°C and 40°C. The results are reported in Table 2 below.

[0107] Table 2

[0108]

[0109] [H / vinyl] molar ratio = 1.8

[0110] It can be observed that the test according to the invention (platinum content of less than 50 ppm by weight relative to the total weight of the composition) makes it possible to obtain a very good bath service duration at 25° C. of about 24 hours instead of 3 hours . At 40°C, the improvement of the composition according to the invention is about 400% to 650%.

Embodiment 3

[0112] The inhibitor ECH (D1.I1) was pre-added to the vinylated dimethicone oil (A.1). After homogenization of the mixture, polymethylhydridosiloxane oil (B.1) is introduced, then the acid to be tested, and finally, the amount of catalyst (C) is fixed at 10 ppm of platinum relative to the total weight of the composition . The formulations are reported in Table 3 below.

[0113] table 3

[0114]

[0115] A sample of each composition was extracted and analyzed by DSC ("Differential Scanning Calorimetry", METLER type device). The analysis was performed in aluminum pans and using a temperature rampe of 25-250°C with a gradient of 10°C / min. This technique is also capable of measuring the peak onset temperature (start of the crosslinking reaction) or "T°C onset", peak apex temperature ("T°C peak") and peak end temperature ("T°C end" of each composition). ).

[0116] Thermal profiles, characteristic data of exothermic peaks (T°C onset, T°C peak and T°C end) are shown in Table...

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Abstract

The present invention relates to the use of inhibitor compounds, in particular inhibitor compounds suitable for inhibiting the curing of a silicone composition that is a precursor of a silicone elastomer produced by a hydrosilylation reaction.

Description

technical field [0001] The present invention relates to the use of inhibitor compounds, especially suitable for inhibiting the curing of silicone compositions which are precursors of silicone elastomers obtained by hydrosilylation reactions. Background technique [0002] When it is desired to increase the pot life (durée de vie en pot) of an addition reaction-curable organopolysiloxane composition or to provide a one-component addition reaction-curable organopolysiloxane composition , usually to introduce hardening inhibitors. Hardening inhibitors are compounds that slow hardening at ambient temperatures, but which do not retard hardening at higher temperatures. These hardening inhibitors are sufficiently volatile to be expelled from the coating composition. [0003] See, for example, patent US No. 3445420 for the use of α-acetylenic compounds such as acetylenic alcohols with a boiling point of less than 250° C., especially 2 - methyl-3-butyn-2-ol and ethynylcyclohexanol,...

Claims

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Application Information

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IPC IPC(8): C08L83/04C09D183/04C09D7/63
CPCC08G77/20C08K5/05C08K5/42C08L83/04C08L2205/02C08G77/12C09D183/04C09D7/63Y10T428/31663C08L83/00C08K13/02B32B27/283C09K15/12
Inventor S·马罗Y·马达蒂
Owner BLUESTAR SILICONES FRANCE SAS
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