Low-temperature-resistant silicone sealant and preparing method thereof

A silicone and sealant technology, applied in the field of sealants, can solve problems such as unsatisfactory low temperature resistance, and achieve the effects of reducing low temperature cracking, improving mechanical properties, and improving low temperature resistance.

Inactive Publication Date: 2015-11-25
DONGGUAN XINXING ORGANIC SILICON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The silicone sealant has excellent bonding performance to glass, aluminum, etc., but it also has the defect that the low temperature resistance is not ideal

Method used

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  • Low-temperature-resistant silicone sealant and preparing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A low-temperature resistant silicone sealant, made of the following components in parts by weight: 100 parts of end-capped polydimethylsiloxane, 5 parts of phenyl silicone oil, 17 parts of fumed white carbon black, methyl trimethoxy 8 parts of base silane, 1.5 parts of dibutyltin dilaurate, 1 part of aminosilane coupling agent, 1.6 parts of calcium chloride, 1.7 parts of naphthylamine anti-aging agent, 2.5 parts of toluene diisocyanate, solubilizer PE-g-MAH4.8 Parts, polysulfone 11.5 parts, calcium carbonate hollow microspheres 14.7 parts.

[0027] The steps of its preparation method are as follows:

[0028] (1) Put the dried calcium carbonate hollow microspheres into absolute ethanol, ultrasonically disperse for 40 minutes, heat to 85°C and stir for 12 minutes, add the aqueous solution of aminosilane coupling agent, heat up to 95°C, and stir for 1 hour Finally, take it out, wash it with absolute ethanol for 5 times, and then place it in a vacuum drying oven and dry it...

Embodiment 2

[0032] A low-temperature resistant silicone sealant, made of the following components in parts by weight: 100 parts of end-capped polydimethylsiloxane, 8 parts of phenyl silicone oil, 19 parts of silicon micropowder, methyltrimethoxysilane 9 parts, 1.8 parts of dibutyltin dilaurate, 0.7 parts of aminosilane coupling agent, 1.4 parts of calcium chloride, 1.9 parts of naphthylamine antioxidant, 4 parts of toluene diisocyanate, 4 parts of solubilizer PE-g-MAH, polysulfone 12 parts, 14.4 parts of calcium carbonate hollow microspheres.

[0033] The steps of its preparation method are as follows:

[0034] (1) Put the dried calcium carbonate hollow microspheres into absolute ethanol, ultrasonically disperse for 40 minutes, heat to 85°C and stir for 12 minutes, add the aqueous solution of aminosilane coupling agent, heat up to 95°C, and stir for 1 hour Finally, take it out, wash it with absolute ethanol for 5 times, and then place it in a vacuum drying oven and dry it at 90° C. for 9...

Embodiment 3

[0038] A low-temperature resistant silicone sealant, made of the following components in parts by weight: 100 parts of end-capped polydimethylsiloxane, 10 parts of phenyl silicone oil, 20 parts of silicon micropowder, methyltrimethoxysilane 3 parts, 1.4 parts of dibutyltin dilaurate, 0.9 parts of aminosilane coupling agent, 1 part of calcium chloride, 1.6 parts of naphthylamine antioxidant, 3 parts of toluene diisocyanate, 4.2 parts of solubilizer PE-g-MAH, 11 parts of polysulfone, 14 parts of calcium carbonate hollow microspheres.

[0039] The steps of its preparation method are as follows:

[0040] (1) Put the dried calcium carbonate hollow microspheres into absolute ethanol, ultrasonically disperse for 40 minutes, heat to 85°C and stir for 12 minutes, add the aqueous solution of aminosilane coupling agent, heat up to 95°C, and stir for 1 hour Finally, take it out, wash it with absolute ethanol for 5 times, and then place it in a vacuum drying oven and dry it at 90° C. for ...

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Abstract

The invention provides low-temperature-resistant silicone sealant. The silicone sealant is prepared from, by weight, 100 parts of end-capped polydimethylsiloxane, 5-10 parts of plasticizers, 15-20 parts of filler, 3-10 parts of cross-linking agents, 1-2 parts of catalysts, 0.5-1 part of coupling agent, 1-2 parts of stabilizers, 1.5-2 parts of antiager, 2-6 parts of tackifier, 4-5 parts of solubilizer PE-g-MAH, 10-12 parts of polysulfone and 14-15 parts of hollow calcium carbonate microspheres. The invention further provides a preparing method of the silicone sealant. The silicone sealant is high in low temperature resistance.

Description

Technical field: [0001] The invention relates to a sealant, in particular to a low-temperature resistant silicone sealant and a preparation method thereof. Background technique: [0002] Silicone sealant is a building sealant and adhesive made of linear silicone polymers composed of silicon and oxygen atoms alternately. It can be used in a wide temperature range, showing excellent high temperature resistance, electrical resistance Insulation, elasticity, aging resistance, ultraviolet radiation resistance, ozone resistance, chemical stability and other characteristics, so it can be used under various conditions, with the advantages of safety, reliability, good weather resistance and long service life. Silicone sealant is divided into one-component and two-component. It is an elastomer that can be cured at room temperature. It is hydrolyzed by dimethylsiloxane intermediate, and then condensed into polysiloxane to become a silicone polymer. . In the early 1960s, silicone buil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/04C09J11/04C09J11/06C09K3/10
Inventor 吴细飞
Owner DONGGUAN XINXING ORGANIC SILICON TECH
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