Silane-terminiated polysulfide rubber sealant and preparation method thereof

A polysulfide rubber, silane-terminated technology, used in adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve the problems of complex construction process, two-component and other problems, achieve easy reaction conditions, promote adhesion, The effect of less air pollution

Active Publication Date: 2013-04-24
肇庆浩宏新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to prepare a silane-terminated polysulfide rubber sealant. The sealant is in the form of a single-component package and can be cured when it is exposed to the atmosphere at room temperature. Most of the existing sealant preparation technologies are two-component Disadvantages of packaging form and complex construction process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Add 100g of liquid polysulfide rubber G21, 33.3g of xylene, and 22.17g of γ-(2,3-glycidyloxy) to a four-necked flask equipped with a stirrer, a thermometer, a reflux condenser and an air guide tube. Propyltrimethoxysilane, feed a stable high-purity nitrogen flow as the protective atmosphere of the reaction system, stir; then slowly raise the temperature to 120°C, react at constant temperature for 30 hours, then cool down to 80°C to remove the solvent in a vacuum, and then obtain alkoxysilane End-capped polysulfide rubber (oligomer).

[0030] (2) Weigh 100g of the above-mentioned silane-terminated polysulfide rubber, 100g of modified active light calcium carbonate, and 65g of mica powder for initial mixing, then place the above-mentioned materials after initial mixing on a three-roll mill for grinding, and grind for three Obtain the base glue of silane-terminated polysulfide rubber sealant after one pass;

[0031] (3) Add 40g of dioctyl phthalate to the base rubber ...

Embodiment 2

[0034] The difference between this embodiment and embodiment 1 is:

[0035]The epoxy silane added in step 1 is 20.67g γ-(2,3-glycidoxy)propylmethyldimethoxysilane, and the constant temperature reaction is 33h; the modified active light calcium carbonate in step 2 is 80g 1. The inorganic extender filler is 70 g of diatomite; the surface dry time of the silane-terminated polysulfide rubber sealant obtained in step 4 is 5 hours, the solid drying time is 48 hours, the Shore A hardness is 48, and the tensile strength is 1.6 MPa.

Embodiment 3

[0037] The difference between this embodiment and embodiment 1 is:

[0038] Add 100g of liquid polysulfide rubber LP-23 and 30g of γ-(2,3-glycidoxy)propyltrimethoxysilane in step 1; the plasticizer added in step 3 is 40g of dibutyl phthalate, Insulate for 3.5 hours and drop to room temperature of 45°C; add 0.3 g of dibutyltin dilaurate and 0.1 g of dihexylamine in step 4, and the surface dry time of the obtained silane-terminated polysulfide rubber sealant is 3.5 hours, and the dry time is 60 hours. The Shore A hardness is 38 and the tensile strength is 1.2MPa.

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Abstract

The invention discloses a silane-terminiated polysulfide rubber sealant and a preparation method thereof. The sealant is prepared from the following components: 100 parts of a silane-terminiated polysulfide rubber, 50 to 100 parts of an inorganic reinforcing filling material, 0 to 150 parts of an inorganic increment filling material, 25 to 60 parts of a plasticizer, 0 to 7.5 parts of a thixotropic agent, 0.05 to 3 parts of a tackifier, 0.1 to 1 part of a curing catalyst and 0 to 0.5 part of a curing accelerator. The sealant is a single-component room temperature moisture-curing sealant, and a construction process for the sealant is simple; the mechanism of curing and cross-linking of the sealant is dealcoholization and condensation, so a small amount of smell is produced; the main agent silane-terminiated polysulfide rubber is a modified polysulfide rubber, and a molecular chain of the silane-terminiated polysulfide rubber has both a liquid polysulfide rubber structure and an organosilicone structure; and the sealant has good air tightness, water tightness and low temperature flexibility and is extensively applicable to bonding or joint filling sealing of a variety of substrates.

Description

technical field [0001] The invention relates to a modified polysulfide rubber elastic sealant, in particular to a one-component room-temperature moisture-curable silane-terminated polysulfide rubber sealant and a preparation method thereof. Background technique [0002] The structural formula of liquid polysulfide rubber is HS(C 2 h 4 OCH 2 OC 2 h 4 SS) n -C 2 h 4 OCH 2 OC 2 h 4 SH, its molecular chain is saturated C-C bond and S-S bond, and the molecular chain is all composed of single bonds, so it has good oil resistance, solvent resistance, impact resistance, air tightness, water tightness and good low temperature flexibility. The elastic polysulfide sealant made of polysulfide rubber as the main body, together with fillers, tackifiers, plasticizers, curing accelerators, etc., is widely used in insulating glass, construction, aerospace, automobile and shipbuilding and other fields. [0003] In the field of modification and reinforcement of polysulfide rubber, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J181/04C09J11/04C09J11/06
Inventor 马文石杨芳
Owner 肇庆浩宏新材料有限公司
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