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Silicone composition and cured silicone product

A composition and siloxane technology, which is applied in the field of cured siloxane products and siloxane resin compositions, can solve the problems of reducing the fracture toughness of cured resins, and achieve the effect of low CTE and excellent fracture toughness

Inactive Publication Date: 2004-09-22
DOW CORNING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of moderate to large amounts of inorganic fillers to conventional silicone resin compositions can significantly reduce the fracture toughness of the cured resin

Method used

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  • Silicone composition and cured silicone product
  • Silicone composition and cured silicone product
  • Silicone composition and cured silicone product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] This example illustrates the preparation of the resins used in Examples 3-6 and Comparative Examples 1-3. In a three-neck round bottom flask equipped with a Dean-Stark trap and thermometer were mixed trimethoxyphenylsilane (200 g), tetramethyldivinyldisiloxane (38.7 g), deionized Water (65.5g), toluene (256g) and triflic acid (1.7g). The mixture was heated at 60-65°C for 2 hours. The mixture was then heated to reflux, and water and methanol were removed using a Dean-Stark trap. When the temperature of the mixture reached 80°C and water and methanol were completely removed, the mixture was cooled to less than 50°C. Calcium carbonate (3.3 g) and water (about 1 g) were added to the mixture. The mixture was stirred at room temperature for 2 hours, and then potassium hydroxide (0.17 g) was added to the mixture. The mixture was then heated to reflux and water was removed using a Dean-Stark trap. When the reaction temperature reached 120°C and the water was completely rem...

Embodiment 2

[0144] This example describes the preparation of 1,4-bis(dimethylsilyl)benzene. Magnesium (84 g) and tetrahydrofuran (406 g) were mixed under nitrogen in a three-necked flask equipped with a mechanical stirrer, condenser, two dropping funnels and a thermometer. 1,2-Dibromoethane (10 g) was added to the mixture, and the contents of the flask were heated to 50-60°C. Tetrahydrofuran (THF, 200 mL) and a solution of 1,2-dibromobenzene (270 g) in THF (526 g) were sequentially added to the mixture, the latter being added dropwise. After about 20 minutes, the heating was discontinued and the remaining 1,2-dibromobenzene was added over about 1.5 hours at such a rate that a slight reflux was maintained. During the addition, THF was added periodically to maintain the reaction temperature less than about 65°C. After the addition of 1,2-dibromobenzene was complete, THF (500 mL) was added to the flask, and the mixture was heated at 65° C. for 5 hours. Heating was discontinued and the mix...

Embodiment 3

[0147] Resin Solution A (53.8 parts), Crosslinker A (9.5 parts) and filler (31.3 parts) were blended in a Ross rotor / stator mixer until the filler became evenly distributed in the mixture. The catalyst (0.5 parts) was added to the mixture, and mixing was continued for about 2 minutes. Table 1 shows the mechanical and thermal properties of the cured silicone products.

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Abstract

A silicone resin composition, comprising (A) 100 parts by weight of an organopolysiloxane resin containing an average of greater than two alkenyl groups per molecule and having less than 1.5 mole percent of silicon-bonded hydroxy groups, (B) an organohydrogensilane in an amount sufficient to cure the composition, (C) an effective amount of an inorganic filler; and (D) a catalytic amount of a hydrosilylation catalyst. The present invention is further directed to a cured silicone product comprising a reaction product of the above-described composition. A cured silicone product comprising a reaction product of the silicone resin composition and a multi-part silicone composition comprising components (A) through (D) in two or more parts, provided components (A), (B), and (D) are not present in the same part.

Description

technical field [0001] The present invention relates to silicone compositions, and more particularly to hydrosilylation addition-curable silicone resin compositions comprising a silicone resin, an organohydrogensilane, and an inorganic filler. The invention further relates to cured silicone products formed from the composition. Background technique [0002] Siloxanes are used in a variety of applications due to their unique combination of properties including high thermal stability, good moisture resistance, excellent flexibility, high ionic purity, low alpha particle emission and compatibility with various Substrates are well bonded. For example, siloxanes are widely used in the automotive, electronics, construction, home appliance and aerospace industries. [0003] Silicone compositions comprising organopolysiloxane resins, organohydrogensiloxanes and hydrosilylation catalysts are well known in the art. Organopolysiloxane resins are typically copolymers containing T and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/36C08K5/54C08L83/04C08L83/05
CPCC08G77/70C08G77/16C08G77/20C08K5/5403C08L83/04C08G77/12C08L83/00
Inventor B·朱
Owner DOW CORNING CORP
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