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Sealing material of organic silicon sulfided at room temp. and preparation process thereof

A sealing material, room temperature vulcanization technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of poor adhesion, inconvenient construction, long curing time, etc., and achieve good adhesion performance and strong elastic expansion and contraction ability , good adhesion effect

Inactive Publication Date: 2005-03-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In U.S.P5053442, Hsien-Kun Chu et al. used alkoxy-terminated polysiloxane as the base rubber, and bifunctional alkoxysilane as the chain extender, and made a low-modulus silicone sealing material with an organic titanium catalyst. The material is odorless and non-corrosive, and has a long storage period, but at the same time, it has problems such as low adhesion and long curing time
[0006] Richard A.Palmer etc. in U.S.P5246980 with hydroxyl-terminated polysiloxane, calcium carbonate, methyl vinyl (N methyl acetamido) silane chain extender, aminooxysilane crosslinking agent as the first component Using hydroxyl-terminated polysiloxane, calcium carbonate, and methyl-terminated polysiloxane as the second component, a two-component low-modulus silicone sealing material is prepared, which has a fast crosslinking speed and deep curing , but there are problems such as construction inconvenience

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Mix 100 parts of hydroxyl-terminated polydimethylsiloxane (viscosity of 20,240cP at 25°C) and 100 parts of superfine active calcium carbonate treated with stearic acid in a sealed condition of 0 Pa in a vacuum. Dry in a blast oven at 110°C for 2 hours before use to obtain the base compound. Then add 7 parts of dimethyl (N methylacetamido silane), 2 parts of methyl tributylketoxime silane, 0.2 parts of dibutyltin dilaurate and 0.5 parts of N-β-(aminoethyl) -γ-Aminopropyldimethoxysilane, mixed evenly under airtight conditions, after vacuum degassing, sealed and stored.

[0035] The prepared silicone sealing material was vulcanized and cross-linked in a 2mm deep mold at 25°C and 50%RH for 7 days to make a dumbbell-shaped sample, and its mechanical properties were tested according to the GB / T528-1998 test standard. The results As shown in Table 1.

Embodiment 2

[0037] Mix 100 parts of hydroxyl-terminated polydimethylsiloxane (viscosity of 1000cP at 25°C) and 50 parts of superfine active calcium carbonate treated with stearic acid under the airtight condition of 0Pa in vacuum, wherein the calcium carbonate Dry it in a blast oven at 110°C for 2 hours before use to obtain the base compound. Then add 5 parts of divinyl (N methylacetamidosilane), 2 parts of ethoxytributanoximinosilane, 0.2 parts of dibutyltin dioctoate and 0.5 parts of (Me3O) 3 SiC 2 h 4 C 6 h 4 CH 2 NHC 2 h 4 NH 2 , mixed evenly under airtight conditions, after vacuum degassing, sealed and stored.

[0038] The prepared silicone sealing material was vulcanized and cross-linked in a 2mm deep mold at 25°C and 50%RH for 7 days to make a dumbbell-shaped sample, and its mechanical properties were tested according to the GB / T528-1998 test standard. The results As shown in Table 1.

Embodiment 3

[0040] Mix 100 parts of hydroxyl-terminated polydimethylsiloxane (viscosity of 12,000cP at 25°C) and 80 parts of superfine active calcium carbonate treated with stearic acid under airtight conditions with a vacuum degree of -0.01Pa, The calcium carbonate was dried in a blast oven at 110° C. for 2 hours before use to obtain the base compound. Add 6 parts of di-n-octyl (N-methylacetamidosilane), 1 part of methyltriacetoxysilane, 0.2 parts of dibutyltin dilaurate and 0.5 parts of (EtO) 3 SiC 3 h 6 NHCH 2 CHOHCH 2 OC 3 h 6 Si(OMe) 3 , mixed evenly under airtight conditions, after vacuum degassing, sealed and stored.

[0041] The prepared silicone sealing material was vulcanized and cross-linked in a 2mm deep mold at 25°C and 50%RH for 7 days to make a dumbbell-shaped sample, and its mechanical properties were tested according to the GB / T528-1998 test standard. The results As shown in Table 1.

[0042] Table 1 Mechanical properties of silicone sealing materials

[0043] ...

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PUM

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Abstract

The invention is a room-temperature sulfurized organic-silicon sealing material, and comprise hydroxyl-capped poly-organic oxosilane 100 shares, filling 5-200 shares, chain extender 1-15 shares, cross-linked curing agent 1-20 shares, catalyst 0.01-5 shares, and tackifier 0.1-20 shares, mixing the above components at high vacuum. Its advantages are strong elastic retractility and rupture elongation above 800%; good bonding property and good adhesion to concrete, etc.

Description

technical field [0001] The invention relates to a room temperature vulcanized silicone sealing material and a preparation method thereof. It specifically relates to a room temperature vulcanized silicone sealing material with low modulus and high elongation properties and a preparation method thereof. The silicone sealing material is obtained by adding a difunctional silane with high hydrolysis reactivity to the components. Achieved. Background technique [0002] With the development of the construction industry, the joints of large concrete facilities such as roads, bridges, high-rise buildings, expressways, and airport runways are increasing, and the aging resistance, water resistance, high elasticity and bonding performance of concrete expansion joint sealing materials are further improved. , has become a problem that is highly valued by the engineering community today. Traditional concrete expansion joint sealing materials are mainly asphalt mastic, asphalt ointment, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C09K3/10
Inventor 郑强陈春荣胡洪国林薇薇
Owner ZHEJIANG UNIV
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