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Liquid silicone rubber composition having low permanent compression deformation and preparation method thereof

A technology of permanent compression deformation and liquid silicone rubber, which is applied in the field of two-component liquid silicone rubber composition and its preparation, and can solve the problems of high price

Active Publication Date: 2013-02-20
SHENZHEN CITY SQUARE SILICONE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fluorosilicone is also used to achieve oil resistance, but the price is very expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] A kind of preparation method of the liquid silicone rubber composition with high aging resistance, high oil resistance and good flame retardancy of the present invention and low permanent compression deformation comprises the following steps:

[0048] Step 1, preparation of base glue

[0049] 100 parts by mass of vinyl polydimethylsiloxane, 1-50 parts by mass of inorganic filler, 1-30 parts by mass of structure control agent, and heat treatment at 100°C-150°C for 0.5-6 hours, Cool to room temperature to obtain base glue;

[0050] Step 2, preparation of material A

[0051] Take 100 parts by mass of the rubber base in step 1, add 1-50 parts by mass of vinyl polydimethylsiloxane to dilute, then add 0.02-4 parts by mass of platinum catalyst, and improve the compression set by 0.01-10 parts by mass agent, and mix uniformly to obtain material A;

[0052] Step 3, preparation of material B

[0053] Take 100 parts by mass of the rubber base in step 1, add 1-50 parts by mass ...

Embodiment 1

[0056] Related Example 1: Sample 1

[0057] Base rubber refining

[0058] 100 parts by mass of vinyl polydimethylsiloxane, 40 parts by mass of fumed silica powder, and 10 parts by mass of hexamethyldisilazane were heat-treated at 140°C for 4 hours and cooled to The base gum is obtained at room temperature; in this embodiment 1 and the following examples, hexamethyldisilazane used as a structural control agent can also be used as low molar mass hydroxyl-terminated polydimethylsiloxane, diphenyl dimethicone Alcohols, dimethyldialkoxysilanes, and compounds containing silicon functional groups.

[0059] Preparation of A1 and B1 silica gel

[0060] Preparation of A1 glue

[0061] Take the above-mentioned 100 parts by mass of rubber base, add 15 parts by mass of vinyl polydimethylsiloxane with a vinyl content of 0.4% for dilution, and 0.6 parts by mass of a catalyst with a platinum metal content of 4000 ppm, and mix them uniformly to obtain A1 material .

[0062] Preparation of...

Embodiment 2

[0065] Related Example 2: Sample 2

[0066] Base rubber refining

[0067] 100 parts by mass of vinyl polydimethylsiloxane, 40 parts by mass of fumed silica powder, and 10 parts by mass of hexamethyldisilazane were heat-treated at 140°C for 4 hours and cooled to Obtain base glue at room temperature;

[0068] Preparation of A2 and B2 silica gel

[0069] Preparation of A2 glue

[0070] Take the above-mentioned 100 parts by mass of rubber base, add 15 parts by mass of vinyl polydimethylsiloxane with a vinyl content of 0.4% for dilution, and 0.6 parts by mass of a catalyst with a platinum metal content of 4000 ppm, and mix them uniformly to obtain material A2 .

[0071] Preparation of B2 Silica Gel

[0072] Take the above 100 parts by mass of rubber base, add 5 parts by mass of vinyl content of 0.1% vinyl polydimethylsiloxane dilution and 10 parts by mass of crosslinking agent; 0.06 parts by mass of inhibitor, 2 parts by mass of 1.5 Micron magnesium oxide; and mix uniformly t...

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PUM

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Abstract

The invention discloses a liquid silicone rubber composition having low permanent compression deformation, which comprises the following components in parts by mass: 100 parts of vinyl polydimethylsiloxane, 1-50 parts of inorganic filler, 1-30 parts of structurized control agent, 0.01-10 parts of crosslinking agent, 0.01-2 parts of platinum catalyst, 0.001-1 part of inhibitor, 0.1-20 parts of magnesium oxide and 0.01-10 parts of compression deformation improver. The invention also discloses a preparation method of the liquid silicone rubber composition having low permanent compression deformation. According to the invention, after the compression deformation improver is introduced into the vinyl polydimethylsiloxane, the permanent compression deformation performance can be obviously reduced; and the liquid silicone rubber composition still has very good processability and is suitable for being used as liquid silicone rubber of a spark plug sheath of an automobile.

Description

technical field [0001] The invention relates to a liquid silicone rubber composition and a preparation method thereof, in particular to a two-component liquid silicone rubber composition with low permanent compression deformation and a preparation method thereof. Background technique [0002] In recent years, with the improvement of global living standards, people have higher and higher requirements for consumer goods, especially for the safety and economy of vehicles. The competition among auto companies will become more and more fierce, and the technical requirements will become higher and higher. At the same time, higher requirements will be put forward for auto parts. [0003] Automobile spark plug, commonly known as the burner, its function is to discharge the pulsed high-voltage electricity sent by the high-voltage wire (burner wire), break down the air between the two electrodes of the spark plug, and generate an electric spark to ignite the mixed gas in the cylinder....

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/05C08K13/06C08K9/06C08K5/14C08K3/36C08K3/34C08K3/26C08K3/22C08K3/04
Inventor 李彦民
Owner SHENZHEN CITY SQUARE SILICONE MATERIALS
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