Easy-stripping type room temperature vulcanizing silicone rubber and preparation method thereof

A room temperature vulcanization, silicone rubber technology, applied in the field of silicone rubber, can solve the problem of difficult cleaning after secondary maintenance, and achieve the effects of cost saving, convenient use and good sealing performance

Active Publication Date: 2010-06-09
GUANGDONG HENGDA NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the existing deoxime-type one-component room temperature vulca

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1

[0032] 100 parts by weight of hydroxy-terminated polydimethylsiloxane with a viscosity of 200 Pa·s at 25°C, 50 parts by weight of polybutene, and 5 parts by weight of titanium dioxide are stirred in a closed reactor under vacuum, and then 1 Parts by weight of methyl tributyl ketoxime silane, 20 parts by weight and a specific surface area of ​​50m 2 / g of hydrophobic fumed silica, 0.05 parts by weight of dibutyltin dilaurate, 1 part by weight of lead octoate, and 5 parts by weight. The kinematic viscosity at 40°C is 26mm 2 / s industrial-grade white oil is stirred for 30-60 minutes under vacuum, then released by nitrogen and put into a closed packaging container. The tensile strength is 1.1MPa, the elongation is 425%, the peeling strength is less than 1.0N / cm, 25℃ Easily peelable room temperature vulcanized silicone rubber with sealing pressure greater than 8.0MPa.

Example Embodiment

[0033] Example 2

[0034] Put 100 parts by weight of hydroxy-terminated polymethylphenylsiloxane with a viscosity of 30 Pa·s at 25°C, 100 parts by weight of MDT-type polymethylsiloxane and 300 parts by weight of diatomaceous earth in a closed reactor. Stir uniformly, and then add 25 parts by weight of tetrakis (methyl isobutyl ketoxime) silane and 3 parts by weight with a specific surface area of ​​300m 2 / g of hydrophobic fumed silica, 2 parts by weight of dibutyltin diacetate and 10 parts by weight of kinematic viscosity at 40°C is 10mm 2 / s cosmetic-grade white oil is stirred for 30-60 minutes under vacuum, then release the vacuum with nitrogen and put it into a closed packaging container. The tensile strength is 1.8MPa, the elongation is 205%, the peeling strength is less than 1.0N / cm, and 25℃. Easily peelable room temperature vulcanized silicone rubber with sealing pressure greater than 8.0MPa.

Example Embodiment

[0035] Example 3

[0036] 60 parts by weight of hydroxy-terminated polydimethylsiloxane with a viscosity of 80 Pa·s at 25°C, and 40 parts by weight of hydroxy-terminated polymethylphenylsiloxane with a viscosity of 1 Pa·s at 25°C, 5 parts by weight of dimethyl silicone oil and 50 parts by weight of silicon micropowder are uniformly stirred in a closed reactor under vacuum, and then 20 parts by weight of methyl tris(methyl isobutyl ketoxime) silane and 3 parts by weight of specific surface area are added in sequence. 200m 2 / g of hydrophilic fumed silica, 0.05 parts by weight of dibutyl tin diphenoxide, 30 parts by weight of kinematic viscosity at 40°C is 60mm 2 / s industrial grade white oil and 5 parts by weight, the kinematic viscosity at 40°C is 26mm 2 / s cosmetic-grade white oil is stirred for 30-60 minutes under vacuum, then release the vacuum with nitrogen and put it into a closed packaging container. The tensile strength is 1.3MPa, the elongation is 185%, the peeling strengt...

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Abstract

The invention provides an easy-stripping type room temperature vulcanizing silicone rubber, which contains hydroxy-terminated dimerization organic group siloxane, a functional filling material, a crosslinking agent, gas phase silicon dioxide, a catalyst, an additive and a plasticizer. The invention also provides a method for preparing the easy-stripping type room temperature vulcanizing silicone rubber, which comprises the following steps: firstly, vacuum-stirring the hydroxy-terminated dimerization organic group siloxane, the plasticizer and the functional filling material in formula proportions in a closed reaction kettle evenly; secondly, adding the crosslinking agent, the gas phase silicon dioxide, the catalyst and the additive in formula proportions in to the closed reaction kettle, and vacuum-stirring the mixture for 30 to 60 minutes; and thirdly, releasing the vacuum by using nitrogen gas, and putting the mixture into a closed packaging container. The easy-stripping type room temperature vulcanizing silicone rubber is particularly suitable for sealing a joint on the surface of a component of a motor vehicle, has excellent sealing performance and stripping performance, and simultaneously is of room temperature vulcanizing type, is cured by moisture, is molded in place and can replace various solid gaskets, so the easy-stripping type room temperature vulcanizing silicone rubber is suitable for manufacturing and maintaining various types of motor vehicles, and can shorten the labour hour and save the cost.

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to an easy-peelable room temperature vulcanized silicone rubber and a preparation method thereof. Background technique [0002] Room temperature vulcanization (RTV) silicone rubber is a liquid rubber cured by moisture at room temperature. Its most notable feature is that it can be cured on the spot without heating or pressure at room temperature. It is extremely convenient to use, so it is widely used in bonding and potting. , fixed, sealed and other occasions. This type of silicone rubber is usually sealed in aluminum tubes or plastic tubes. When in use, it is extruded from the tubes and interacts with moisture in the air to release acids, alcohols, ketone oximes or other substances to make the rubber cross-linked and solidified. rubber elastomer. Usually people can be divided into deacidification type, dealcoholization type, deoxime type silicone rubber and many other va...

Claims

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Application Information

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IPC IPC(8): C08L83/06C08K13/02C08K5/01C09K3/10
Inventor 叶发德周为民
Owner GUANGDONG HENGDA NEW MATERIALS TECH
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