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Stress relaxation type polyether sealant based on terminal silane modification and preparation method of polyether sealant

A technology of end-group silane and sealant, applied in the field of sealant, can solve the problems of inability to solve the problem of internal stress of the substrate, slowly expanding joints, damage to the bonding surface, etc., to widen the scope of application, reduce internal stress, promote Effects of Stress Relief Properties

Inactive Publication Date: 2019-01-18
美好建筑装配科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the building base material will shrink over time, resulting in the tendency of the joint to expand slowly. The bonding surface of ordinary sealant will bear a large mechanical effect, and the sealant will crack and the bonding surface will be damaged. And other issues
Most of the existing MS sealants have a high elastic recovery rate, which cannot solve the internal stress problem caused by the long-term shrinkage of the substrate

Method used

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  • Stress relaxation type polyether sealant based on terminal silane modification and preparation method of polyether sealant
  • Stress relaxation type polyether sealant based on terminal silane modification and preparation method of polyether sealant
  • Stress relaxation type polyether sealant based on terminal silane modification and preparation method of polyether sealant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of stress relaxation type polyether building sealant based on terminal group silane modification, its preparation method comprises the following steps:

[0040] 100g of kaolin, 50g of heavy calcium carbonate and 450g of fumed silica were dried in a vacuum oven at 110-120°C and under vacuum for 6 hours, and the moisture in the filler was removed for subsequent use; 300g of terminal silane-capped polyether ( 180g KANEKAS203H+120g KANEKA MAX923) and the filler after dehydration were added to the stirring tank together, and 300g of diisononyl phthalate and 30g of titanium dioxide were added, stirred at a high speed at 120°C and vacuumed for 1.5h, and dispersed evenly to obtain Premix; lower the temperature of the stirring tank to normal temperature, gradually add 10g of light stabilizer (Tinuvin326), 10g of antioxidant (irganox1076) and 10g of water remover (A171), and continue to disperse at a high speed for 30min; keep at normal temperature, add 10g of N -(β-aminoe...

Embodiment 2

[0042] The preparation method of the stress-relieving polyether construction sealant based on terminal group silane modification described in Example 2 is roughly the same as that in Example 1, except that the formulation system used is shown in Table 1.

[0043] The mixture ratio of the stress relaxation type polyether construction sealant based on terminal silane modification described in Table 1 Example 2

[0044]

Embodiment 3

[0046] The preparation method of the stress-relieving polyether construction sealant based on terminal group silane modification described in Example 3 is roughly the same as that of Example 1, except that the formulation system used is shown in Table 1.

[0047] Table 2 The mix ratio of the stress-relieving polyether construction sealant based on terminal silane modification described in Example 3

[0048]

[0049] The performance test results of the obtained sealant are shown in Table 3.

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Abstract

The invention belongs to the field of sealants and discloses a stress relaxation type polyether sealant for buildings based on terminal silane modification. The polyether sealant is mainly prepared from a terminal silane-capped polyether polymer, a plasticizer, a reinforcing filler, an increment filler, a silane coupling agent, a light stabilizer, an antioxidant, a dehydrant, a coloring agent anda catalyst. Generally, the stress relaxation performance and the elasticity recovery performance cannot be simultaneously realized, the silane modified sealant prepared by virtue of the preparation method has the stress relaxation property while meeting the elastic requirement, and the influence caused by the shrinkage of a building base material can be maximally eliminated under the stress relaxation effect even when the building base material is in a long-term stretching state; and in the premise that the elasticity recovery rate is more than 70% in an international standard GB / T14683-2017,the stress relaxation performance is provided for the sealant, so that the problems that the sealant is broken or the adhesion surface is damaged and the like caused due to the shrinkage of the building base material are effectively solved, and the application range of the sealant is broadened.

Description

technical field [0001] The invention belongs to the technical field of sealants, and in particular relates to a stress-relieving polyether sealant based on terminal silane modification and a preparation method thereof. Background technique [0002] Silane-modified polyether construction sealant is a kind of construction sealant, which inherits the characteristics of terminal silane group structure and main chain polyether bond structure in structure, and combines the advantages of polyurethane sealant and silicone sealant in performance , especially suitable for the sealing of concrete joints in prefabricated buildings, is an important direction for the development of new sealants at home and abroad. [0003] Compared with traditional prefabricated buildings, silane-modified polyether sealants have the following advantages: 1) Strong bonding with concrete and strong displacement capacity; due to temperature changes, concrete shrinkage, and building Slight vibration or subsi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J171/02C09J11/04C09J11/06
CPCC08K2003/2241C08K2003/265C08K2003/3045C08K2201/011C09J11/04C09J11/06C09J171/02C08L71/02C08K3/346C08K3/26C08K3/36C08K5/12C08K3/22C08K3/30C08K7/28
Inventor 柯凌波
Owner 美好建筑装配科技有限公司
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