Silicon rubber internal release agent and preparation method thereof

An internal release agent and silicone rubber technology, which is applied in the field of silicone rubber processing, can solve the problems of poor stability and poor heat resistance of the release agent, and achieve the effects of easy dispersion, low surface tension, and high pass rate

Active Publication Date: 2015-10-28
安徽东爵有机硅有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: The purpose of the invention is to solve the problems of poor stability and poor heat resistance of existing release agents, and provide a silicone rubber inner release agent with good heat resistance, good stability, and good compatibility with silicone rubber. Molding agent and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Silicone rubber internal release agent, 100 parts of polydimethyl-methyl trifluoropropyl silicone oil (10% of molarity of methyl trifluoropropyl chain, viscosity 200cs), 20 parts of zinc stearate, calcium stearate 50 parts, white carbon black 10 parts, MDT silicone oil 2 parts.

[0024] The preparation method of silicone rubber internal release agent, put polydimethyl-methyl trifluoropropyl silicone oil into the kneader, add white carbon black, zinc stearate and calcium stearate in 3-6 batches, white The three substances, carbon black, zinc stearate and calcium stearate, are not in any order. They can be added after mixing, or added separately. Each time after forming a group, add the next filler. When adding the filler for the second time, start Add lubricating oil, when the final agglomerate is formed, start vacuuming at 50-100°C, the vacuum degree is -0.05±0.01MPa, the vacuuming time is 30 minutes, and the material can be discharged after vacuuming.

[0025] Polydim...

Embodiment 2

[0029] Silicone rubber internal mold release agent, 100 parts of polydimethyl-methyl trifluoropropyl silicone oil (20% molar number of methyl trifluoropropyl chain, viscosity 200cs), 30 parts of zinc stearate, calcium stearate 30 parts, 40 parts of talcum powder, 5 parts of polyethylene glycol.

Embodiment 3

[0031] Silicone rubber internal mold release agent, 100 parts of polydimethyl-methyl trifluoropropyl silicone oil (30% of the molar number of methyl trifluoropropyl chain, viscosity 200cs), 60 parts of zinc stearate, calcium stearate 10 parts, 15 parts of mica powder, 40005 parts of polyethylene glycol.

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PUM

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Abstract

The invention discloses a silicon rubber internal release agent and a preparation method thereof. The main component of the silicon rubber internal release agent is polydimethyl-methyl trifluoropropyl silicone oil, due to very low surface tension and excellent thermal stability of the polydimethyl-methyl trifluoropropyl silicone oil, the prepared silicon rubber internal release agent can be applied in a harsh temperature environment, has high safety, and is nonirritating and harmless. The silicon rubber internal release agent provided by the invention has the advantages of stable chemical properties, easy dispersion, low adding proportion and the like. When the silicon rubber internal release agent is used for preparation of uniform films and complex-shaped objects, formed products with accurate size and high qualified rate can be obtained.

Description

technical field [0001] The invention belongs to the technical field of silicone rubber processing, and in particular relates to a silicone rubber internal release agent with excellent mold release properties for silicone rubber products with poor mold release properties and complex mold structures and a preparation method thereof. Background technique [0002] The function of the release agent is to separate the cured and formed product from the mold smoothly, so as to obtain a smooth and flat product, and ensure that the mold can be used repeatedly. It is widely used in metal die-casting, polyurethane foam and elastomer, glass fiber reinforced plastic , injection molding thermoplastics, vacuum foamed sheets and extruded profiles in various molding operations. Silicone rubber release agent is specially used to prevent molded vulcanized silicone products from being difficult to take out from the mold when they are released from the mold. In the vulcanization of silicone rubbe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/08C08K5/098C08K3/36C08K3/34C08G77/24
Inventor 徐党生
Owner 安徽东爵有机硅有限公司
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