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A kind of modified terminal silane polyether sealant and preparation method thereof

A silane-terminated polyether and sealant technology, applied in the field of sealants, can solve the problems of lower elongation at break of elastomers, poor toughness of sealants, etc., and achieve the effects of good strength and toughness, fast bonding and positioning, and convenient use.

Active Publication Date: 2021-09-24
COLLTECH DONGGUAN BONDING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of fillers are used in the above disclosed technologies to achieve the purpose of reinforcement, but the toughness of the sealant after curing is poor, especially the base material used in the first patent above is a low molecular weight silane-terminated polyether, although the system The viscosity is reduced, but the elongation at break of the cured elastomer is greatly reduced

Method used

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  • A kind of modified terminal silane polyether sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0040] S1. Take dry 100 parts of light calcium carbonate with an average particle size of 1.8 μm and add it to a ball mill, stir and preheat to a temperature of 60°C, add 1.5 parts of 3-(2,3 glycidoxypropyl) trimethoxy Modified solution prepared by silane, 15 parts of ethanol and 1.5 parts of water, stirred evenly, dried for later use;

[0041] S2. the mol ratio of calcium carbonate obtained in step S1, 1.86 parts of polyetheramine T403 (i.e. 3-(2,3 glycidoxypropyl) trimethoxysilane and polyetheramine T403 of BASF, Germany) to polyetheramine T403 is 1.5:1 ), 0.3 parts of triethanolamine were mixed evenly according to the proportion, and the air bubbles in the mixture system were removed by centrifugation, placed in a drying oven, and reacted at 80°C / 2h+125°C / 2h to obtain modified calcium carbonate.

preparation example 2

[0043] The rest is the same as Preparation Example 1, except that the amount of polyetheramine T403 is 2.33 parts, that is, the molar ratio of epoxy silane coupling agent to polyetheramine T403 is 1.2:1.

preparation example 3

[0045] The rest is the same as Preparation Example 1, except that the amount of polyetheramine T403 is 1.4 parts, that is, the molar ratio of epoxy silane coupling agent to polyetheramine T403 is 2:1.

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Abstract

A modified terminal silane polyether sealant, the filler used in the sealant comprises modified calcium carbonate, the modified calcium carbonate is first dry-modified the calcium carbonate with an epoxy silane coupling agent, Then it is made by secondary modification with polyether amine. The modified calcium carbonate prepared by the present invention is an organically modified calcium carbonate whose surface wraps polymers. This modified calcium carbonate is applied in the silane-terminated polyether sealant system, which can make the cured sealant have good strength. and toughness. The unexpected discovery of the present invention is that the above-mentioned modified calcium carbonate and fumed silica have synergistic effects in improving the thixotropy of the system in the silane-terminated polyether sealant system. The silane-terminated polyether sealant prepared by the invention has excellent curing bonding strength, deep-layer curing speed, fast surface drying, fast bonding and positioning, and is convenient to use. The silane-terminated polyether sealant prepared by the invention does not contain volatile solvents, can be catalyzed by an organic bismuth catalyst, is a green product, and can be widely used in electronic products.

Description

technical field [0001] The invention belongs to the technical field of sealants, and in particular relates to a modified end-silane polyether sealant and a preparation method thereof. Background technique [0002] The sealant is a sealing material that fills the joints in an indeterminate form, bonds the interface and withstands the displacement and deformation of the joints. It not only prevents the leakage of internal components, but also prevents the entry of external dust, vibration reduction, sound insulation and heat insulation. . [0003] Silane-terminated polyether sealant, also known as silicone modified polyether sealant, referred to as MS sealant, was first developed and industrialized by Japan Nakabuchi Chemical Industry Company, because of its excellent adhesion and heat resistance , cold resistance, weather resistance, paintability and process operability, etc., have been widely recognized by the market, and its output has continued to increase. The silane-te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J171/00C09J11/04
CPCC08K2003/265C09J11/04C09J171/00C08K13/06C08K9/10C08K9/06C08K3/26C08K7/26
Inventor 蔡伟何培林黄成生
Owner COLLTECH DONGGUAN BONDING TECH CO LTD
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