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Silicone rubber composition for templating matrix and templating matrix

A technology of silicone rubber and composition, which is applied in the field of silicone rubber composition and impression master mold, and can solve the problems of replica staining and difficult material degassing, etc.

Inactive Publication Date: 2010-09-01
MOMENTIVE PERFORMANCE MATERIALS JAPAN LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the blending of these types of non-crosslinkable silicone polymers has problems such as staining of replicas due to oil bleeding, and difficulty in degassing the uncured material.

Method used

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  • Silicone rubber composition for templating matrix and templating matrix

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In (A) 80 parts of dimethyl polysiloxane (viscosity 7000cP, vinyl value 0.007 mol / 100g) capped (blocked) by vinyl dimethyl silicone groups at both ends, mixed with a kneader with a specific surface area of ​​about 240m 2 20 parts / g of hydrophobic fumed silica (AEROSIL R-976 manufactured by Nippon Aerosil Co., Ltd.), 6 parts of hexamethyldisilazane and 1 part of water were added while fully stirring, and mixed for 1 hour without heating , then the temperature was raised to 150° C., and after mixing was continued for 2 hours, the temperature was lowered to room temperature.

[0029]To 100 parts of the base compound thus obtained, 0.1 part of (C) chloroplatinic acid-vinylsiloxane complex (platinum concentration 2 wt %), 0.05 part of tetramethyltetravinylcyclosiloxane, ( B) 3 parts of methylhydrogenpolysiloxane (refer to the following average formula) were mixed until uniform to prepare a composition.

[0030]

[0031] 0.5 part of (D) terminal ethoxy polydimethylsiloxa...

Embodiment 2～5、 comparative example 1～12

[0046] When changing the blending amount of polydimethylsiloxane with terminal ethoxy (viscosity 50cSt) as shown in Table 1, and except that the ingredients shown in Table 1 are blended in the amount shown in Table Except for polydimethylsiloxane (viscosity: 50 cSt), a silicone rubber composition for stamp master was obtained in the same manner as in Example 1, and evaluated. The results are shown in Table 1.

[0047] From the results in Table 1, it can be seen that the cured product obtained from the composition described in the method of the present invention has good peelability to excellent casting resins, and the material before curing has good defoaming properties.

[0048] Table 1

[0049]

[0050]

[0051] Table 1 (continued)

[0052]

[0053]

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Abstract

It is intended to provide a silicone rubber composition for a templating matrix which has an excellent mold release property, gives less stain to replicated products, and is excellent in defoaming of a material before curing. More particularly, it is a silicone rubber composition for a templating matrix containing (A) a polyorganosiloxane having 2 or more alkenyl groups binding to a silicon atom in one molecule and a viscosity at 25 C of 500,000 to 1,000,000 centipoise (100 parts by weight); (B) a polyorganohydrogensiloxane having 3 or more hydrogen atoms binding to a silicon atom in one molecule (an amount such that the number of hydrogen atoms binding to a silicon atom per alkenyl group binding to a silicon atom in the component (A) is 0.4 to 4); (C) a platinum compound (1 to 200 ppm by weight in terms of platinum atom relative to the component (A)); and (D) a polydimethylsiloxane having an alkoxy group with 1 to 3 carbon atoms binding to a silicon atom at its molecular terminal and an average degree of polymerization of 5 to 500 (0.1 to 10 parts by weight).

Description

technical field [0001] The present invention relates to a silicone rubber composition excellent in releasability, which is used as a transfer master (reverse master) for impressions, and an impression master (type acquisition り master) obtained from the composition type). Background technique [0002] The mold release durability is required for the silicone rubber mold used as the transfer master mold for stamps. In order to improve the release durability of silicone rubber molds, attempts have been made to combine the following substances: a substance obtained by hydrophobizing a reinforcing silica filler with a silazane compound; Reinforcing hydrophilic silica treated substances, etc. According to these methods, the improvement of the mold release durability of the silicone rubber mold has been confirmed, but the mold release performance is not as good as resins such as epoxy resins and polyurethane resins with high physical properties that are currently the mainstream o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07B29C33/64C08L83/05C08L83/06
CPCB29C33/64C08G77/20C08L83/04C08G77/12
Inventor 高桥英雄
Owner MOMENTIVE PERFORMANCE MATERIALS JAPAN LLC