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One-component silane-modified polyether sealant with high elasticity and low modulus and preparation method thereof

A technology of silane-modified polyether and low modulus, which is applied in the field of sealant, which can solve the problems of non-paintable limited application range, lack of high elasticity, low modulus, insufficient UV resistance, etc., and achieve excellent tensile strength and fracture Elongation, low production cost, good ductility effect

Active Publication Date: 2021-02-02
GUANGDONG PUSTAR SEALED RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyurethane building sealant is cheap, has excellent adhesion, and has excellent deformation adaptability, but its structure contains a large number of urethane bonds, which is seriously insufficient in UV resistance and other aspects.
Although silicone sealant is excellent in acid and alkali resistance and weather resistance, its non-paintability limits its application range
Silane-modified polyether sealant is the fastest-growing building sealing material in the past 30 years. It has both good adhesive performance of polyurethane and excellent acid and alkali resistance and weather resistance of silicone sealant. It is also environmentally friendly, odorless and does not pollute the substrate. The surface can be painted, and it is the most suitable building sealing material for industrial buildings, but the limitation of ether bonds in the structure of silane-modified polyether leads to insufficient elasticity
[0004] At present, most of the silane-modified polyether products in the existing technology belong to the 20LM model, which cannot meet the requirements for some construction joints with large deformation and displacement. Therefore, the existing technology lacks high-elasticity and low-modulus silane-modified polyether buildings. sealant

Method used

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  • One-component silane-modified polyether sealant with high elasticity and low modulus and preparation method thereof
  • One-component silane-modified polyether sealant with high elasticity and low modulus and preparation method thereof
  • One-component silane-modified polyether sealant with high elasticity and low modulus and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A high-elasticity and low-modulus one-component silane-modified polyether sealant, made of the following components in parts by weight:

[0042]

[0043] The small-molecule silane coupling agent is a small-molecule compound that contains urethane bonds and is terminated by siloxane at both ends.

[0044] The small-molecule silane coupling agent is obtained by stirring and refluxing at 30°C to 70°C for 60min to 180min at both ends of an aminosilane coupling agent, an isocyanatosilane coupling agent and an organic solvent under the condition of being isolated from air. Blocked silane coupling agent;

[0045]Alternatively, the small molecule silane coupling agent is a two-terminal siloxane obtained by stirring and refluxing at 30°C to 60°C for 30min to 120min under the isolation of air from organic polyamines, isocyanate silane coupling agents and organic solvents. Blocked silane coupling agent;

[0046] Alternatively, the small molecule silane coupling agent is an am...

Embodiment 2

[0074] A high-elasticity and low-modulus one-component silane-modified polyether sealant, made of the following components in parts by weight:

[0075]

[0076] The small molecule silane coupling agent is a small molecule compound that contains urethane bonds and is terminated by siloxane at both ends.

[0077] Wherein, the synthesis of small molecule silane coupling agent: in the 250ml four-neck flask with reflux, stirring and dropping funnel, add the xylene solvent of 150g and the aminosilane coupling agent of adding 11.05g, heat up to 60°C, and then use a constant pressure dropping funnel to drop 10.25g of isocyanate-based silane coupling agent, and continue stirring for 80 minutes to obtain a silane coupling agent with urethane bonds capped at both ends.

[0078] In this embodiment, the aminosilane coupling agent is a silane coupling agent containing a primary amino group, and the silane coupling agent containing a primary amino group is γ-aminopropyltrimethoxysilane. ...

Embodiment 3

[0095] A high-elasticity and low-modulus one-component silane-modified polyether sealant, made of the following components in parts by weight:

[0096]

[0097]

[0098] The small molecule silane coupling agent is a small molecule compound that contains urethane bonds and is terminated by siloxane at both ends.

[0099] Wherein, the synthesis of small molecule silane coupling agent: in the 250ml four-neck flask with reflux, stirring and dropping funnel, add the n-hexane solvent of 150g and the aminosilane coupling agent of adding 11.1g, heat up to 75°C, and then use a constant pressure dropping funnel to drop 12.4 g of isocyanate-based compounds, and continue to stir for 60 minutes to obtain a silane coupling agent with urethane bonds terminated at both ends.

[0100] In this example, the aminosilane coupling agent is a silane coupling agent containing a primary amino group, and the silane coupling agent containing a primary amino group is γ-aminopropylmethyldimethoxysil...

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Abstract

The invention relates to the technical field of sealants, and in particular relates to a high-elastic low-modulus single-component silane modified polyether sealant and a preparation method thereof. The high-elastic low-modulus single-component silane modified polyether sealant comprises a terminal silane-based modified polyether, a plasticizer, a small molecule silane coupling agent, a filler, apigment, a thixotropic agent, a light stabilizer, an UV absorber, a water remover, a catalyst and an adhesion promoter. Compared with silane-modified polyether sealants in the prior art, the high-elasticity low-modulus one-component silane-modified polyether sealant prepared by adding a small-molecule silane coupling agent, cooperating with a low-activity bismuth catalyst and modifying organosilane modified polyether resin by stepwise reaction has excellent tensile strength and elongation at break, has better ductility, low modulus and very good elastic recovery rate, and is in line with the requirements of assembled exterior wall joints for the sealant.

Description

technical field [0001] The invention relates to the technical field of sealants, in particular to a high-elasticity and low-modulus one-component silane-modified polyether sealant and a preparation method thereof. Background technique [0002] Prefabricated buildings are one of the main directions of future building development. The key to waterproofing is the sealing and waterproofing of exterior wall joints. There are mainly two ways of structural waterproofing and material waterproofing. Among them, the waterproofing of the material mainly uses the sealant of polymer materials. According to the special environment of the building exterior wall, the performance of the waterproof sealant has the following requirements: 1) The concrete material used in the prefabricated wallboard is a microporous and alkaline material, plus For long-term exposure to outdoor use, the sealant is required to have good acid and alkali resistance and freeze-thaw cycle resistance; 2) The size of p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J171/00C09J11/06C09J11/04C09K3/10
CPCC08K2003/2241C09J11/04C09J11/06C09J171/00C09K3/10C08K5/544C08K5/12C08K3/04C08K3/22C08K3/36C08K13/02
Inventor 骆行岚钟天颜小雨
Owner GUANGDONG PUSTAR SEALED RAYON CO LTD
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