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Silane modified polyurethane sealant prepolymer and preparation method thereof and sealant

A polyurethane sealant and silane modification technology, which is applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve problems such as a large number of air bubbles, affecting the sealing effect, and destroying the concrete interface, so as to achieve colloidal compactness, Good sealing effect, good bonding effect

Inactive Publication Date: 2017-01-04
JIANGSU CANLON BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, most of the polyurethane sealant prepolymers on the market are mainly NCO-terminated, and a large number of air bubbles appear after the sealant is made, which is easy to expand the joint and destroy the bonded interface with the concrete, seriously affecting the sealing effect
There are also literature reports on silane-modified polyurethane sealant prepolymers, but after being made into sealants, they are often high-modulus and low-rebound sealants, which are not suitable for concrete joints

Method used

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  • Silane modified polyurethane sealant prepolymer and preparation method thereof and sealant
  • Silane modified polyurethane sealant prepolymer and preparation method thereof and sealant
  • Silane modified polyurethane sealant prepolymer and preparation method thereof and sealant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment provides a silane-modified polyurethane sealant prepolymer, which is prepared by the following method:

[0035] Add 200g of polypropylene oxide glycol (molecular weight 1000, purchased from Dow Chemical, brand name Voranol2110TB) into the reaction kettle, stir evenly and raise the temperature to 110°C, vacuum dehydration for 2 hours, reduce the temperature to 80°C, add 220g MDI-100 Stir and react for 2 hours, then add 800g of polypropylene oxide triol (molecular weight 3000, purchased from Shandong Lanxing Dongda Chemical Co., Ltd., brand name DL-3000) and react at 80°C for 3 to 4 hours, then cool to 50°C , Add 114g of γ-aminopropyltrimethoxysilane dropwise until the NCO content is completely consumed, and stir for 2 hours to obtain a prepolymer.

Embodiment 2

[0037] This embodiment provides a silane-modified polyurethane sealant prepolymer, which is prepared by the following method:

[0038] Add 200g of polypropylene oxide glycol (molecular weight 2000, purchased from Dow Chemical, brand name Voranol2120) into the reactor, stir evenly and raise the temperature to 110°C, vacuum dehydration for 2 hours, reduce the temperature to 80°C, add 135g MDI-100 Stir and react for 2 hours, then add 700g of high activity polyether triol (molecular weight 6000, purchased from Dow Chemical, trade name Voranol6055), react at 80°C for 3 to 4 hours, cool to 50°C, add 108g γ-aminopropyl dropwise Trimethoxysilane until the NCO content is completely consumed, stir for 2 hours to obtain a prepolymer.

[0039] Performance tests were performed on the prepolymers of Examples 1 and 2, and the test results are shown in Table 1.

[0040] Table 1 shows the performance test results of the prepolymers of Examples 1 and 2

[0041] performance Example 1 Example 2 Ext...

Embodiment 3

[0044] This embodiment provides a one-component silane-modified polyurethane sealant for construction. The raw materials and dosages used are shown in Table 1.

[0045] Wherein, the prepolymer adopts the prepolymer of Example 1;

[0046] The filler is heavy calcium carbonate;

[0047] The plasticizer is DINP;

[0048] Adhesion promoter is γ-aminopropyltrimethoxysilane, which is purchased from Xinyue Silicone, the brand name is KBM-903;

[0049] The thixotropic agent is fumed silica, purchased from Deshan Chemical, the brand is PM-20L;

[0050] The ultraviolet absorber is UV-1;

[0051] The ultraviolet stabilizer is UV-P;

[0052] The catalyst is dibutyl tin dilaurate.

[0053] The preparation method of the sealant is: adding prepolymer, dried filler, plasticizer and thixotropic agent into a biaxial planetary dispersing kettle, dispersing at a low speed for 15 minutes, vacuuming, filling with nitrogen, and dispersing at a high speed for 30 minutes, followed by Add adhesion promoters, ultrav...

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Abstract

The invention relates to a silane modified polyurethane sealant prepolymer and a preparation method thereof and a sealant. The prepolymer is prepared from, by mass, 70%-80% of polyether polyol, 10%-20% of isocyanate and 5%-15% of silane coupling agent, wherein polyether polyol is a mixture of polyether polyol A and polyether polyol B according to the mass ratio of 0.2 to 0.3, the polyether polyol A is polyether diol, and the polyether polyol B is polyether triol. The prepolymer is end-capped with silane, the molecular structure of the prepolymer has polyether segments with carbamate as nodes and chain segments end-capped with silane, the characteristics of silane and polyurethane are combined, the prepolymer is used for preparing the sealant, and the sealant has the performance of low modulus and high resiliency.

Description

Technical field [0001] The invention belongs to the technical field of polyurethane sealants and is applied to the construction industry, and specifically relates to a silane-modified polyurethane sealant, a sealant and a preparation method. Background technique [0002] Polyurethane sealant is usually made of polyurethane prepolymer and other materials. It has high tensile strength, excellent elasticity, abrasion resistance, oil resistance and cold resistance, and is widely used as caulking in buildings, squares and highways. Sealing material. But at present, most of the polyurethane sealant prepolymers on the market are mainly NCO-terminated. After the sealant is made, a large number of bubbles appear, which are easy to expand and damage the interface with the concrete, which seriously affects the sealing effect. There are also literature reports on silane-modified polyurethane sealant prepolymers, but the sealants are often high modulus and low resilience sealants, which are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/28C09J175/08
CPCC08G18/289C08G18/4812C08G18/4825C08G18/4829C08G18/6666C08G2190/00C09J175/08C08L77/00
Inventor 赵祖兵孙先坤徐家康
Owner JIANGSU CANLON BUILDING MATERIALS
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