Method for preparing silicone sealant

A technology of silicone sealant and base glue, which is applied in the direction of chemical instruments and methods, adhesives, adhesive additives, etc., can solve the problems of silicone sealants, etc., and achieve increased product stability, good economic benefits and social benefits. Benefits, simple and feasible process

Active Publication Date: 2014-03-19
GUANGXI HUANA NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After retrieval, there is no report of adopting this method to prepare silicone sealant in relevant literature.

Method used

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  • Method for preparing silicone sealant

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Experimental program
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Effect test

Embodiment 1

[0033] 100 parts of 50000cP α, ω-dihydroxypolydimethylsiloxane with a specific surface area of ​​35m 2 120 parts / g of active nano-calcium carbonate, 15 parts of heavy calcium and 4 parts of 8000cP dimethyl silicone oil are added to the vacuum kneader, the temperature of the material is controlled at 75 ° C, the vacuum is -0.1 MPa, and the heating is stopped after mixing for 3 hours. Inject nitrogen to release the vacuum, add 0.1 part of γ-aminopropyltriethoxysilane, and knead for 0.5h to make the base rubber; the base rubber is sealed and cooled to room temperature, then moved into a planetary mixer, and methyl tributylketoxime silane is added in turn 8 parts, 1 part of vinyl tributyl ketoxime silane, 0.5 parts of γ-aminopropyl triethoxysilane and 0.25 parts of γ-(2.3-glycidyloxy) propyl trimethoxysilane, dilauric acid di 0.1 part of butyl tin, vacuumize and stir with the rubber base for 60 minutes, and keep the vacuum at -0.1MPa.

Embodiment 2

[0035] 100 parts of 80000cP α, ω-dihydroxypolydimethylsiloxane with a specific surface area of ​​30m 2 115 parts / g of active nano-calcium carbonate, 13 parts of heavy calcium and 5 parts of 5000cP dimethyl silicone oil are added to the vacuum kneader, the temperature of the material is controlled at 80 ° C, the vacuum degree is -0.1 MPa, and the heating is stopped after mixing for 3 hours. Inject nitrogen to release the vacuum, add 0.1 part of γ-aminopropyltriethoxysilane, 0.05 part of γ-(2.3-glycidoxy)propyltrimethoxysilane, and mix for 0.5h to make base rubber; the base rubber is sealed After cooling to room temperature, move it into a planetary mixer, add 7 parts of methyl tributyl ketoxime silane, 1 part of vinyl tributyl ketoxime silane, and 0.08 part of dibutyltin dilaurate in turn, and stir with base glue for 60 minutes in a vacuum. The degree is maintained at -0.1MPa.

Embodiment 3

[0037] 100 parts of α, ω-dihydroxy polydimethylsiloxane with 100000cP and a specific surface area of ​​25m 2 105 parts / g of active nano-calcium carbonate, 11 parts of heavy calcium and 7 parts of 2000cP dimethyl silicone oil were added to the vacuum kneader, the temperature of the material was controlled at 130 ° C, the vacuum degree was -0.1 MPa, and the heating was stopped after mixing for 3 hours. Inject nitrogen to release the vacuum, add 1 part of composite dry silane, and knead for 0.5 hours to make the base rubber; after the base rubber is sealed and cooled to room temperature, move it into a planetary mixer, add 6 parts of methyl tributylketoxime silane, γ-aminopropyl 1.5 parts of base triethoxysilane, 0.12 parts of dibutyltin dilaurate, vacuum-stir with the base rubber for 60min, and keep the vacuum at -0.1MPa.

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Abstract

The invention discloses a method for preparing silicone sealant. The method comprises the following steps: adding alpha,omega-dyhydroxy polydimethylsiloxane, filler and dimethyl silicon oil into a vacuum kneading machine, vacuuming, heating and mixing for 2-5 hours; stopping heating, introducing nitrogen to change the vacuum state, adding a silane coupling agent, mixing for 0.5-1 hour at the vacuum degree of -0.06 to -0.1Mpa, introducing nitrogen to change the vacuum state; sealing and cooling to room temperature, subsequently transferring into a stirring machine, adding a cross-linking agent, a thickening agent and a catalyst, vacuuming, and uniformly stirring and mixing so as to obtain the silicone sealant. According to a product of the silicone sealant, the addition amount of the filler is increased, the product stability and the surface smoothness are improved, the thixotropy and the deep curing are also improved, the curing homogeneity is good, the tensile strength, the elasticity and the cohesiveness are greatly improved, expensive white carbon black can be replaced, the filling amount is large, the curing time is short, the construction efficiency is improved, the process is simple and feasible, the production cost is low, and good economic benefits and social benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a silicone sealant, in particular to a preparation method of the silicone sealant. Background technique [0002] Silicone sealant is a kind of sealing material made of hydroxyl-terminated polysiloxane as the base material. It belongs to silicone products. The curing and cross-linking process is firstly that the cross-linking agent is hydrolyzable after contacting the moisture in the atmosphere. The functional group of the compound undergoes rapid hydrolysis reaction to generate silanol. The Si-OH group of its silanol and the 107 glue The Si-OH group undergoes a condensation reaction to form a three-dimensional network Si-O-Si skeleton structure and becomes an elastomer. Silicone sealant is easy to use, the volume shrinkage rate of the colloid after curing is small, the sealing performance is good, the adhesive force is strong, the tensile strength is high, and it has g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/06C09J183/04C09J11/04C09J11/06C09K3/10
Inventor 龙小娥李佩华颜干才谌业文李文婷韦官文朱勇
Owner GUANGXI HUANA NEW MATERIALS TECH CO LTD
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