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Polycondensation type single-component silicon rubber capable of being vulcanized at room temperature and under heating condition, and preparation method thereof

A one-component, silicone rubber technology, applied in the field of one-component silicone rubber materials, polycondensation type one-component silicone rubber and its preparation, to achieve stable storage at room temperature and shorten the deep vulcanization cycle

Active Publication Date: 2013-08-28
XIAMEN JINTAIXIANG NEW TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] So far, there is still a lack of a one-component room temperature vulcanized silicone rubber that is stable in storage at room temperature, can be vulcanized at room temperature after being extruded from the hose, and can be vulcanized quickly under appropriate heating conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation of embodiment 1 one-component silicone rubber

[0035]Put 1,000g of α,ω-terminated dihydroxypolydimethylsiloxane with a viscosity (25°C) of 10,000mPa·s and 300g of dried silicon micropowder with a particle size of 800 mesh into a planetary mixer and disperse evenly. Heat to remove water for 4 hours at a temperature not lower than 1.33kPa and at a temperature of 120±5°C. When the rubber material is cooled below 30°C, add 120g of dimethyldichlorosilane-treated material with a specific surface area of ​​200m2 to the rubber material. 2 / g of fumed white carbon black, 80g of methyl tributyl ketoxime silane, 2.0g of dibutyltin dilaurate and 50g of alum powder with a particle size of 5-50μm; stir for 1h under moisture-proof conditions. The product obtained above is sealed and stored in a 300ml volume rubber tube under a moisture-proof condition.

[0036] After testing, the storage period of the silicone rubber product prepared in this example at room temperat...

Embodiment 2

[0038] The preparation of embodiment 2 one-component silicone rubber

[0039] Add 1,000g (25°C) of α,ω-terminated dihydroxypolydimethylsiloxane with a viscosity of 20,000mPa·s into a planetary mixer under nitrogen protection, and then add 20g of methyltrimethoxysilane and 7g of dibutyl formate Amine salt, the above mixture was reacted at 75° C. for 1 h, and then cooled to room temperature. Add 300g of nano-calcium carbonate powder (50-100nm) treated at 120°C for 5h, 30g of vinyltrimethoxysilane, 10g of propyl titanate, and 70g of copper sulfate pentahydrate fine powder with a particle size of 10-60μm. Stirred under conditions for 1h. The product obtained above is sealed and stored in a 300ml volume rubber tube under a moisture-proof condition.

[0040] After testing, the storage period of the one-component rubber product prepared in this embodiment at room temperature in the rubber tube is not less than half a year.

[0041] A ball with a diameter of 20 mm made of one-compo...

Embodiment 3

[0042] The preparation of embodiment 3 one-component silicone rubber

[0043] The specific surface area of ​​1000g of α, ω-terminated dihydroxypolydimethylsiloxane with a viscosity of 20000mPa·s and 100g of hexamethyldisilazane treatment is 200m 2 / g of fumed silica, 50g of raw gypsum powder with a particle size of 5-20μm were stirred evenly under moisture-proof conditions, and 50g of methyltrimethoxysilane, 20g of KH-560 (γ-(2,3-epoxy propyl group) propyl group-trimethoxysilane), 1g dibutyl tin diacetylacetonate, 1g acetylacetone mixed evenly under moisture-proof conditions; put the above products into a 300ml rubber tube under moisture-proof conditions Keep airtight.

[0044] After testing, the storage period of the one-component silicone rubber product prepared in this example at room temperature in the rubber tube is not less than half a year.

[0045] The one-component silicone rubber product prepared in this example is directly extruded from the rubber tube to make a b...

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Abstract

The invention discloses polycondensation type single-component silicon rubber capable of being vulcanized at room temperature and under a heating condition, and belongs to the field of silicon rubber materials. The polycondensation type single-component silicon rubber is prepared from the following raw materials: a reactive basic polymer, a filler, a crosslinking agent, a coupling agent, a catalyst and an inorganic compound with crystal water. A preparation method of the polycondensation type single-component silicon rubber comprises the following steps of: (1) uniformly stirring the reactive basic polymer, the dry filler and the inorganic compound with the crystal water under a moisture-insulating condition to obtain a mixture; and (2) adding the crosslinking agent, the coupling agent and the catalyst into the mixture, and stirring and mixing uniformly under the moisture-insulating condition to obtain the polycondensation type single-component silicon rubber. The polycondensation type single-component silicon rubber can be stored in a rubber pipe at room temperature for not less than half a year and is stored at room temperature very stably; and after being extruded out of the rubber pipe, the rubber material can be dried superficially at room temperature within half an hour, can be completely vulcanized for 7 days and can be vulcanized deeply and quickly within several hours under a proper heating condition, so that the deep vulcanization cycle of the rubber material is effectively shortened.

Description

technical field [0001] The invention relates to a one-component silicone rubber, in particular to a polycondensation type one-component silicone rubber capable of both room-temperature vulcanization and high-temperature heating vulcanization and a preparation method thereof, belonging to the field of one-component silicone rubber materials. Background technique [0002] Currently commercially available room temperature vulcanizable silicone rubbers are divided into single-component, two-component polycondensation-type silicone rubber and two-component addition-type silicone rubber; heat-vulcanizable silicone rubber (HVR) is only addition-type (one-component) )Silicone Rubber. [0003] Although addition-type silicone rubber can be formulated into two-component room temperature vulcanization type, it can also be formulated into one-component high-temperature vulcanization type silicone rubber adhesive or sealant, but it cannot be formulated into one-component room temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/06C08K3/30C08J3/24
Inventor 张恩天张永生
Owner XIAMEN JINTAIXIANG NEW TECH
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