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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 vulcanized silicone rubber has good adhesion to the surface of most motor vehicle parts and is difficult to clean during secondary maintenance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 100 parts by weight of hydroxyl-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 were stirred evenly in a closed reactor under vacuum, and then sequentially added 1 The methyl tributylketoxime base silane of weight part, 20 weight parts specific surface areas are 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 of kinematic viscosity at 40°C is 26mm 2 / s industrial-grade white oil was stirred in vacuum for 30-60 minutes, and the vacuum was released with nitrogen and packed into a sealed packaging container to obtain a tensile strength of 1.1MPa, an elongation of 425%, a peel strength of less than 1.0N / cm, and a temperature of 25°C. Easy-peeling room temperature vulcanized silicone rubber with an hourly sealing pressure greater than 8.0MPa.

Embodiment 2

[0034] Put 100 parts by weight of hydroxyl-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 under vacuum Stir evenly, then successively add 25 parts by weight of tetrakis (methyl isobutyl ketoximino) silane, 3 parts by weight of the specific surface area is 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 was stirred in vacuum for 30-60 minutes, and the vacuum was released with nitrogen and packed into a sealed packaging container to obtain a tensile strength of 1.8MPa, an elongation of 205%, a peel strength of less than 1.0N / cm, and a temperature of 25°C. Easy-peeling room temperature vulcanized silicone rubber with an hourly sealing pressure greater than 8.0MPa.

Embodiment 3

[0036]60 parts by weight of hydroxyl-terminated polydimethylsiloxane with a viscosity of 80 Pa·s at 25°C, 40 parts by weight of hydroxyl-terminated polymethylphenylsiloxane with a viscosity of 1 Pa·s at 25°C, 5 parts by weight of simethicone oil and 50 parts by weight of silicon micropowder were uniformly stirred in a closed reactor under vacuum, and then 20 parts by weight of methyl tris(methyl isobutyl ketoxime) silane, 3 parts by weight of 200m 2 / g of hydrophilic fumed silica, 0.05 parts by weight of dibutyldiphenoxytin, and 30 parts by weight of kinematic viscosity at 40°C is 60 mm 2 The kinematic viscosity at 40°C of industrial grade white oil and 5 parts by weight per s is 26mm 2 / s cosmetic-grade white oil was stirred in vacuum for 30-60 minutes, and the vacuum was released with nitrogen and packed into a sealed packaging container to obtain a tensile strength of 1.3MPa, an elongation of 185%, a peel strength of less than 1.0N / cm, and a temperature of 25°C. Easy-peel...

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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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