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Catalyst for addition type silicone rubber cured at low temperature and preparation method thereof

A catalyst and silicone rubber technology, applied in the low temperature curing catalyst for addition type silicone rubber and its preparation field, can solve problems such as easy leakage, and achieve the effects of avoiding reaction, convenient use and mild reaction conditions

Active Publication Date: 2021-08-24
东莞市博恩复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another example is to directly use polycaprolactone as the wall material of capsules to prepare microencapsulated catalysts. Although the curing temperature is low, polycaprolactone itself is easy to degrade under natural conditions, so it is used to prepare addition-type catalysts. There is a risk of easy leakage during storage of silicone rubber

Method used

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  • Catalyst for addition type silicone rubber cured at low temperature and preparation method thereof
  • Catalyst for addition type silicone rubber cured at low temperature and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Platinum catalyst emulsification: 10 grams of Custer platinum catalyst of 1000 ppm, 100 grams of distilled water and 6 grams of gum arabic are placed in a three-necked flask with a stirrer, and stirred for 1.5 hours at a speed of 1500 rpm to obtain oil- water emulsion;

[0028] Composite with polyethylene glycol: put the oil-water emulsion in a water bath and heat up to 65°C, keep the stirring speed at 1500 rpm, gradually add 160 grams of polyethylene glycol with an average molecular weight of 18000 to the oil-water emulsion alcohol;

[0029] Distillation under reduced pressure: raise the reaction temperature to 97°C, vacuumize and reduce pressure, and distill and stir for 1 hour until the reactant appears milky white;

[0030] Cooling and stirring: Stop heating and vacuum decompression, reduce the stirring speed to 300 rpm, and continue stirring for 3 hours. When the reaction temperature drops below 40°C, add ice cubes to the water bath until the reaction temperature ...

Embodiment 2

[0036] Platinum catalyst emulsification: 8 grams of Custer platinum catalysts with a concentration of 1500ppm, 100 grams of distilled water and 4 grams of gum arabic are placed in a three-necked flask with a stirrer, and stirred for 1 hour at a speed of 2000 rpm to obtain oil- water emulsion;

[0037] Composite with polyethylene glycol: put the oil-water emulsion in a water bath and heat up to 70°C, keep the stirring speed at 2000 rpm, gradually add 200 grams of polyethylene glycol with an average molecular weight of 15000 to the oil-water emulsion alcohol;

[0038] Distillation under reduced pressure: raise the reaction temperature to 95°C, vacuumize and reduce pressure, and distill and stir for 1.5 hours until the reactant appears milky white;

[0039] Cool down and stir: Stop heating and vacuum decompression, reduce the stirring speed to 500 rpm, and continue stirring for 2 hours. When the reaction temperature drops below 40°C, add ice cubes to the water bath until the rea...

Embodiment 3

[0045] Platinum catalyst emulsification: 3 grams of Custer platinum catalyst with a concentration of 5000ppm, 100 grams of distilled water and 2 grams of gum arabic were placed in a three-necked flask with a stirrer, and stirred for 0.5 hour at a speed of 3500 rpm to obtain oil- water emulsion;

[0046] Composite with polyethylene glycol: put the oil-water emulsion in a water bath and heat up to 75°C, keep the stirring speed at 3500 rpm, gradually add 300 grams of polyethylene glycol with an average molecular weight of 5000 to the oil-water emulsion alcohol;

[0047] Distillation under reduced pressure: raise the reaction temperature to 90°C, vacuumize and reduce pressure, and distill and stir for 2.5 hours until the reactant appears milky white;

[0048] Cool down and stir: Stop heating and vacuum decompression, reduce the stirring speed to 800 rpm, and continue stirring for 1.5 hours. When the reaction temperature drops below 40°C, add ice cubes to the water bath until the ...

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Abstract

The low-temperature-cured addition-type silicone rubber catalyst comprises the following components in weight percent: 2.04-3.79 percent of platinum catalyst, 18.94-40.73 percent of distilled water, 0.2-2.17 percent of emulsifier, and 57.03-75.76 percent of polyethylene glycol. The invention also discloses a preparation method of a catalyst for low-temperature curing addition-type silicone rubber and the low-temperature-curing addition-type silicone rubber prepared by the catalyst. The low-temperature-cured addition-type silicone rubber catalyst of the present invention uses the Custer platinum catalyst as a capsule core, and wraps a layer of polyethylene glycol mixture on the outside of the catalyst to obtain a microcapsule-type composite platinum catalyst. The addition-type silicone rubber prepared by the catalyst does not need to be stored in a refrigerator at low temperature, which not only simplifies the storage and transportation method, saves costs, but also has a storage time of up to 6 months, which is convenient for use. In addition, the addition-type silicone rubber starts to cure when it is heated to 50-65° C., the reaction conditions are mild, and the operation is simple.

Description

【Technical field】 [0001] The invention relates to a catalyst, in particular to a catalyst for low-temperature curing addition-type silicone rubber with convenient packaging and transportation and mild reaction conditions and a preparation method thereof. 【Background technique】 [0002] In the field of silicone, the curing and crosslinking methods of silicone rubber mainly include peroxide crosslinking, UV curing, addition crosslinking, and condensation crosslinking. Among them, peroxide cross-linking is mainly suitable for high-temperature adhesive systems; UV curing requires special equipment and cures faster, but the equipment is expensive and may have certain negative effects on health; condensation cross-linking will release small molecules during the curing process, The complete curing time is too long, which is not suitable for high-precision application scenarios; the addition cross-linking method is widely used because there are no by-products, low curing requirement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08L83/07C08L83/05C08G77/08C08G77/44
CPCC08G77/08C08G77/44C08J3/246C08J2383/07C08J2483/05
Inventor 陈冠锦杨晓生
Owner 东莞市博恩复合材料有限公司
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