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Silicone elastomer for sealing, and preparation method and application thereof

A technology of silicone elastomers and elastomers, applied in chemical instruments and methods, other chemical processes, adhesives, etc., can solve problems such as insufficient hardness, insufficient strength, and low effect, and achieve good strength and high flame retardancy Effect

Active Publication Date: 2018-04-24
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Just because the structure of the basic polymer of one-component room temperature vulcanized silicone rubber has not changed, and the extensive use of reinforcing fillers has caused many problems in the current aquarium sealant: insufficient strength, insufficient hardness, and use in parts that require transparency. Problems such as opalescence and poor light transmission
Although these measures improve some properties of the material, the effect is not great and not ideal

Method used

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  • Silicone elastomer for sealing, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment relates to a silicone elastomer used for sealing, and its preparation method comprises the following steps:

[0034] 1) Add 100g of methyltrichlorosilane, 50g of phenyltrichlorosilane, 800g of dimethyldichlorosilane, and 800g of toluene into a 3000ml three-necked flask;

[0035] 2) Slowly add 100g of deionized water dropwise under the condition of temperature control at 10°C and stirring. After the dropwise addition, maintain the temperature and stir, and react for 2 hours;

[0036] 3) Separating the lower layer of acidic water, washing the organic layer repeatedly to neutrality, removing the toluene solvent at 120°C, cooling the system to room temperature, and obtaining a transparent viscous paste;

[0037] 4) Take 300g of the above paste, add 3g polyether modified silicone oil, 1g200mm 2 / s of simethicone oil, 0.03g of acrylonitrile, 0.45g of butyl titanate, and 15 parts of methyltriacetoxysilane were added under nitrogen and moisture barrier conditio...

Embodiment 2

[0039] This embodiment relates to a silicone elastomer used for sealing, and its preparation method comprises the following steps:

[0040] 1) Add 180g of methyltrichlorosilane, 100g of phenyltrichlorosilane, 1500g of dimethyldichlorosilane, and 1500g of toluene into a 5000ml three-necked flask;

[0041] 2) Slowly add 500g of deionized water dropwise under the condition of temperature control at 0°C and stirring. After the dropwise addition, maintain the temperature and stir, and react for 2 hours;

[0042] 3) Separating the lower layer of acidic water, washing the organic layer repeatedly to neutrality, removing the toluene solvent at 120°C, cooling the system to room temperature, and obtaining a transparent viscous paste;

[0043] 4) Take 300g of the above paste, add 3g of polyether modified silicone oil, 0.03g of cyclohexanone oxime, 0.45g of dibutyltin dilaurate, and add 15 parts of methyltriacetoxy Silane, mixed to obtain silicone elastomer.

Embodiment 3

[0045] This embodiment relates to a silicone elastomer used for sealing, and its preparation method comprises the following steps:

[0046]1) Add 150g of methyltrichlorosilane, 70g of phenyltrichlorosilane, 800g of dimethyldichlorosilane, 10g of methylphenyldichlorosilane, and 830g of xylene into a 3000ml three-necked flask;

[0047] 2) Slowly add 200g of deionized water dropwise under the condition of temperature control at 20°C and stirring. After the dropwise addition, maintain the temperature and stir, and react for 1.5 hours;

[0048] 3) Separating the lower layer of acidic water, washing the organic layer repeatedly to neutrality, removing the xylene solvent at 140°C, cooling the system to room temperature, and obtaining a transparent viscous paste;

[0049] 4) Take 300g of the above paste, add 3g polyether modified silicone oil, 10g 500mm 2 / s of simethicone oil, 0.03g tetraalkylthiuran disulfide, 0.4g dibutyl tin dioctoate, add 5 parts of ethyl triacetoxysilane under ...

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Abstract

The invention relates to a silicone elastomer for sealing. The base polymer of the silicone elastomer is prepared by polymerizing methyltrichlorosilane, phenyltrichlorosilane and dimethyldichlorosilane, and then the base polymer reacts with polyether modified silicone oil, a catalyst, a mildew preventive and a cross-linking agent to obtain the silicone elastomer. The silicone elastomer material synthesized by the method provided by the invention not only has the softness, the moisture resistance, the weather resistance and the durability of single-component room-temperature vulcanized siliconerubber, but also has better strength, adhesion, hydrophobicity, heat resistance, chemical reagent resistance and flame retardant and higher transparency due to the introduction of a highly crosslinked structure.

Description

technical field [0001] The invention relates to the field of liquid silicone rubber, in particular to a silicone elastomer used for sealing. Background technique [0002] As we all know, liquid silicone rubber is an elastomer commonly used in various fields in modern times, and its various excellent properties are beyond the reach of any other elastomer. Such as: excellent high and low temperature resistance, it can be used in the temperature range of -60 ℃ ~ 315 ℃; excellent weather aging resistance, it is estimated by the test that it can be used outdoors for 10 to 20 years; there are also such as electrical insulation , hydrophobicity, anti-adhesive, biochemical compatibility and other excellent properties. Moreover, large-scale processing equipment is generally not required for use, and it can be vulcanized into an elastomer in the atmosphere or under heating after extrusion, injection, and coating according to the variety and application. [0003] The thermal expansio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/24C09J183/08C09K3/10
CPCC08G77/24C09J183/08C09K3/10
Inventor 宋振虎涂世俭余志刚
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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