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Heat-resistant addition type liquid silicone rubber composition

A liquid silicone rubber, addition molding technology, applied in the field of heat-resistant and oxygen-resistant aging modification of silicone polymer materials, can solve the problem that the processing properties and mechanical properties cannot meet the production requirements, the mechanical properties and processing properties are unfavorable, and the application of silicone rubber is limited. problems, to achieve the effect of suitable for large-scale production, good physical and mechanical properties, and enhanced thermal oxidation resistance

Active Publication Date: 2022-07-26
GUANGDONG POLYSIL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the patent document (Japanese National Publication No. 2016-518461), a method of improving the heat resistance of silicone rubber by adding 0.1% by mass or more of titanium oxide and iron oxide is described, but this method only measures the temperature at 300°C. The amount of formaldehyde, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane produced by heating for 1 hour, there is no record of the change in the physical properties of silicone rubber
In addition, iron oxide is widely known as a coloring agent for silicone rubber, and even a small amount of iron oxide can color silicone rubber in red. Therefore, even if you want to color silicone rubber in a color other than red, it is actually difficult to do so. coloring
Chinese patent CN103788655A adopts SnO 2 It is a heat-resistant additive, but due to its high polarity and poor compatibility with silicone rubber, the processing performance and mechanical properties cannot meet the production requirements
[0004] To sum up, although metal oxides or metal hydroxides are generally used to improve the heat resistance of silicone rubber, they still have disadvantages such as poor compatibility with silicone rubber, which is unfavorable to mechanical properties and processing properties. After that, the specific gravity of silicone rubber increases and it is not easy to attach other colors. It is also easy to cause problems such as catalyst poisoning in addition-type silicone rubber, which greatly limits the application of silicone rubber in areas with higher requirements.

Method used

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  • Heat-resistant addition type liquid silicone rubber composition
  • Heat-resistant addition type liquid silicone rubber composition
  • Heat-resistant addition type liquid silicone rubber composition

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preparation example Construction

[0048] This embodiment also provides a method for preparing the heat-resistant addition type liquid silicone rubber composition, which specifically includes the following steps:

[0049] Step 1: Prepare the base glue

[0050] Mix vinyl-terminated polydimethylsiloxane, methyl vinyl silicone rubber, composite metal oxide nanorod-silica aerogel powder, hydrophobic fumed silica, silane treatment agent, and deionized water by pressing The proportion is put into the internal mixer, kneaded evenly under the condition of 120-180 ℃, the material is discharged and parked for 12-30 hours, and then put into the machine again and kneaded at room temperature for 1.5-3 hours;

[0051] Step 2: Prepare Component A

[0052] Add 75 to 140 parts of the prepared base glue or base glue mixture, add 10 to 55 parts of vinyl-terminated polydimethylsiloxane to disperse it uniformly and adjust the viscosity, then add vinyl-containing silicone resin, Si -H addition catalyst is added to the mixer accord...

Embodiment 1

[0078] The preparation method of the heat-resistant addition type liquid silicone rubber described in the present embodiment 1 mainly further comprises the following steps:

[0079] Preparation of component A

[0080] The above 100 parts of base rubber a, 10 parts of vinyl-terminated polydimethylsiloxane with a viscosity of 80,000 mPa·s and a vinyl content of 0.03 mmol / g were stirred and dispersed in a planetary mixer, and then 10 parts of viscosity were added. 20000mPa·s, vinyl-terminated polydimethylsiloxane with a vinyl content of 0.04mmol / g, 18 parts of an organic compound with a viscosity of 2000mPa·s, a vinyl content of 0.2mmol / g, and an M / Q value of 0.8 Silicone resin, 0.028 part of platinum(0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex, continue to disperse in a planetary mixer for 0.5-1h, and further vacuumize De-bubble can be done.

[0081] Preparing Part B

[0082] The above 100 parts of base glue a, 15 parts of vinyl-terminated polydimethylsiloxane with a...

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Abstract

The invention provides a heat-resistant addition type liquid silicone rubber composition. The silicone rubber composition is composed of the following components in parts by weight: 135-185 parts of vinyl-containing organopolysiloxane; 70 to 115 parts of composite metal oxide nanorod-silicon dioxide aerogel powder; 10 to 30 parts of hydrophobic fumed silica; 5 to 30 parts of vinyl-containing organic silicon resin; 5 to 15 parts of organic hydrogenated polysiloxane; 10 to 20 parts of a silane treating agent; 0.004 to 0.08 part of a Si-H addition catalyst; and 0.03 to 0.6 part of an inhibitor. According to the addition type liquid silicone rubber composition, a base rubber mixture prepared from composite metal oxide nanorod-silicon dioxide aerogel powder is used as a main material, the material has good compatibility with silicone rubber, and the raw materials are easy to obtain; the invention also provides a preparation method of the heat-resistant addition type liquid silicone rubber composition.

Description

technical field [0001] The invention belongs to the technical field of heat-resistant oxygen aging modification of silicone polymer materials, in particular to a heat-resistant addition type liquid silicone rubber composition. Background technique [0002] Addition type liquid silicone rubber has the advantages of low viscosity and low vulcanization temperature, and no by-products are produced during curing. The end product is easy to realize automatic production, which greatly improves the production efficiency, so it is more and more favored by the market. Based on its unique chemical structure, silicone rubber has the advantages of better physiological inertia, safety, superior electrical insulation, weather resistance, good cold resistance and heat resistance compared with ordinary rubber, and has been widely used in multiple fields. [0003] Usually, the temperature resistance limit of silicone rubber in the air is high, but when the temperature exceeds 250 °C, the sil...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/05C08K9/12C08K7/26C08K9/04C08K7/08C08K9/06
CPCC08L83/04C08L2201/08C08K2201/011C08K9/12C08K7/26C08K9/04C08K7/08C08K9/06
Inventor 谢荣斌代志祥
Owner GUANGDONG POLYSIL TECH CO LTD