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Condensed type double-component silicone sealant and preparation method thereof

A silicone sealant, two-component technology, applied in the field of materials, can solve the problems of low strength, softening of vulcanizate, performance impact, etc.

Active Publication Date: 2015-06-03
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the "return to original" phenomenon of the condensation-type two-component silicone sealant heated under airtight conditions, its use under airtight conditions and under the action of heat is subject to corresponding restrictions, or its performance in this use environment be greatly affected
Due to the "return to original" phenomenon, if the two-component silicone sealant is not fully cured after sizing, it will also appear "return to original" phenomenon even under high-temperature conditions in a closed environment, resulting in incomplete curing and obvious vulcanizate changes. Soft, obviously low strength phenomenon
However, there is currently no relevant report on solving or improving the phenomenon of "returning to the original" in China

Method used

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  • Condensed type double-component silicone sealant and preparation method thereof
  • Condensed type double-component silicone sealant and preparation method thereof
  • Condensed type double-component silicone sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] In this embodiment, a condensation-type two-component silicone sealant is prepared from the following raw materials in parts by weight:

[0077] Component A: 90 parts of α,ω-dihydroxy polydimethylsiloxane with a viscosity of 20000mPa.s, 10 parts of simethicone oil with a viscosity of 100mPa.s, and 100 parts of nano-active calcium carbonate.

[0078] Component B: 8 parts of simethicone oil with a viscosity of 1000mPa.s, 3 parts of carbon black, 2 parts of ethyl orthosilicate, 1 part of methyl triethoxysilane, 2 parts of aminopropyl triethoxysilane, 1 part of γ-glycidyl etheroxypropyltrimethoxysilane, 0.02 part of dibutyltin dilaurate, and 0.5 part of isobutyl titanate.

[0079] The preparation method of the above-mentioned condensation type two-component silicone sealant is as follows:

[0080] Component A: Add α, ω-dihydroxypolydimethylsiloxane, nano-active calcium carbonate, and simethicone oil to the twin-screw extruder after the metering system is accurately metered...

Embodiment 2

[0084] In this embodiment, a condensation-type two-component silicone sealant is prepared from the following raw materials in parts by weight:

[0085] Component A: 90 parts of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 12000mPa.s, 10 parts of simethicone oil with a viscosity of 350mPa.s, 80 parts of nano-active calcium carbonate, and 40 parts of heavy calcium carbonate .

[0086] Component B: 8 parts of dimethyl silicone oil with a viscosity of 10000mPa.s, 1 part of fumed silica, 2 parts of carbon black, 2 parts of propyl orthosilicate, methyltriethoxysilane oligomer (polymerization degree 2) 1 part, 2 parts of N-β aminoethyl γ-aminopropyl trimethoxysilane, 1 part of γ-glycidyloxypropyl trimethoxysilane, 0.4 part of isopropyl titanate.

[0087] The preparation method of the above-mentioned condensation type two-component silicone sealant is as follows:

[0088] Component A: Add α,ω-dihydroxy polydimethylsiloxane, nano-active calcium carbonate, heavy calcium car...

Embodiment 3

[0092] In this embodiment, a condensation-type two-component silicone sealant is prepared from the following raw materials in parts by weight:

[0093] Component A: 60 parts of α,ω-dihydroxypolydimethylsiloxane with a viscosity of 50000mPa.s, 25 parts of α,ω-dihydroxypolydimethylsiloxane with a viscosity of 10000mPa.s, a viscosity of 1000mPa.s 15 parts of simethicone oil, 90 parts of nano-active calcium carbonate, and 40 parts of heavy calcium carbonate.

[0094] Component B: 8 parts of simethicone oil with a viscosity of 4000mPa.s, 1 part of fumed silica, 2 parts of carbon black, 2 parts of propyl orthosilicate, 1 part of methyl trimethoxysilane, aminopropyl trimethoxysilane 2 parts of ethoxysilane, 1 part of epoxycyclohexyltrimethoxysilane, 0.02 part of dioctyltin dilaurate, and 0.8 part of diisopropoxytitanium bis(β-diketone ester) complex.

[0095] The preparation method of the above-mentioned condensation type two-component silicone sealant is as follows:

[0096] Compo...

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Abstract

The invention discloses a condensed type double-component silicone sealant and a preparation method thereof. The silicone sealant composed of a component A and a component B, wherein the component A comprises 100 parts of organic polysiloxane polymer and 60-150 parts of inorganic fillers; the B component comprises 2-10 parts of organic polysiloxane polymer, 0.1-10 parts of inorganic fillers, 2-10 parts of silane crosslinking agent, 1-6 parts of silane coupling agent, 0-0.2 part of organic bismuth catalyst and 0.01-1 part of titanium catalyst; the silane crosslinking agent is selected at least one of compounds with structures as shown in a formula I, R1-R6 are C1-C6 alkyls or alkoxys, at least two of R1-R6 are independently selected from C1-C6 alkoxys, and m is 0, 1, 2, 3, 4. The prepared sealant has good physical and mechanical properties, can relieve the reversion phenomenon resulting from heating in a sealed condition and is widely used such fields as buildings, hollow insulating glass, electronic and electrical appliances, road traffic, etc.

Description

technical field [0001] The invention relates to the field of materials, in particular to a condensation type two-component silicone sealant and a preparation method thereof. Background technique [0002] At present, compared with single-component silicone sealants, condensation-type two-component silicone sealants have the advantages of fast curing speed and deep curing. Sealing, bonding and potting of electronics / electrical appliances, and seam sealing in other roads and industrial fields, etc. [0003] Although the condensation type two-component silicone sealant has relatively good heat resistance during use, its long-term use temperature can reach 150°C; but when heated under closed conditions, due to the action of residual catalysts (organotin compounds), Si- The O bond breaks, causing the vulcanizate to become soft and even liquid. This phenomenon is called "reversion" in relevant monographs. [0004] Due to the "return to original" phenomenon of the condensation-typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/06C09J183/04C09J11/06C09J11/04
Inventor 蒋金博刘正伟张冠琦曾武曾容
Owner GUANGZHOU BAIYUN CHEM IND
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