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High-thixotropy and rapid-curing single-component low-modulus polyurethane sealant and preparation method thereof

A polyurethane sealant, fast curing technology, applied in the field of polyurethane, can solve the problems of affecting the curing strength of polyurethane adhesive, slow curing speed, unable to meet the needs of rapid operation, etc.

Inactive Publication Date: 2020-12-18
HANGZHOU ZHIJIANG NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patent application number 200510102933.2 discloses a direct bonding polyurethane sealant. The coupling agents used are all commercial silane coupling agents. The direct addition of such coupling agents will affect the curing strength of the polyurethane adhesive.
CN111073588A a kind of primer-free single-component polyurethane adhesive sealant and its preparation method and CN111378413A a kind of primer-free single-component polyurethane sealant and its preparation method all adopt similar schemes, and the curing speed of the product is relatively slow
[0004] Therefore, the one-component low-modulus polyurethane sealant currently on the market often has a slow curing speed, which has the defect that it cannot meet the needs of fast operation.

Method used

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  • High-thixotropy and rapid-curing single-component low-modulus polyurethane sealant and preparation method thereof
  • High-thixotropy and rapid-curing single-component low-modulus polyurethane sealant and preparation method thereof
  • High-thixotropy and rapid-curing single-component low-modulus polyurethane sealant and preparation method thereof

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preparation example Construction

[0044] The present invention provides a method for preparing the one-component low-modulus polyurethane sealant described in the above technical solution, comprising the following steps:

[0045] Mix polyurethane prepolymer, plasticizer, filler, water absorbing agent and thixotropic agent under vacuum conditions, then add synthetic coupling agent and catalyst a and stir well to obtain a high thixotropic, fast-curing one-component low-modulus Measure polyurethane sealant.

[0046] In the present invention, the polyurethane prepolymer is preferably prepared according to the following method:

[0047] It is prepared by reacting polyether polyol, isocyanate a and catalyst b with a mass ratio of 100:5-20:0.01-0.05.

[0048] The polyether polyol is preferably first heated to 110-130°C for dehydration for 2 hours, and then cooled to 50°C to add isocyanate a and catalyst b, then heated to 75-90°C, stirred and reacted for 2-6 hours, until the -NCO content reaches the set value After ...

Embodiment 1

[0064] Heat 1000g polyether triol (average molecular weight 5000) and 500g polyether diol (average molecular weight 2000) to 130°C for dehydration for 2 hours, then cool down to 50°C and add 4,4'-diisocyanatophenylmethane (4,4'-MDI) 258g (NCO / OH=1.8 at this time), dibutyltin dilaurate 0.15g, after mixing, heat up to 90°C and react for 3h to obtain polyurethane prepolymer A1 with NCO% content of 2.20% ;

[0065] Heat 1000g polyether triol (average molecular weight 5000) and 500g polyether diol (average molecular weight 2000) to 130°C for dehydration for 2 hours, then cool down to 50°C and add 4,4'-diisocyanatophenylmethane (4,4'-MDI) 275g (NCO / OH=2.0 at this time), butyltin oxide 0.45g, after mixing, heat up to 75°C and react for 5h to obtain polyurethane prepolymer A2 with an NCO% content of 2.64%;

[0066] Heat 1500g of polyether triol (average molecular weight 6000) to 130°C for dehydration for 2 hours, then cool down to 50°C and add 210g of 4,4'-diisocyanatophenylmethane (...

Embodiment 1～6

[0071] Add the polyurethane prepolymer in Preliminary Example 1, dehydrated plasticizer, water absorbing agent, dried filler, and thixotropic agent into the planetary mixer according to the amounts in Table 1 and Table 2, and mix evenly under vacuum conditions. The vacuum degree is not lower than 980mbar, then add synthetic coupling agent and catalyst a, and stir evenly to obtain a high thixotropic, fast-curing one-component low-modulus polyurethane sealant.

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Abstract

The invention provides a high-thixotropy and rapid-curing single-component low-modulus polyurethane sealant and a preparation method thereof. The high-thixotropy and rapid-curing single-component low-modulus polyurethane sealant is prepared from the following components in parts by weight: 25-45 parts of polyurethane prepolymer, 0-20 parts of plasticizer a, 30-50 parts of filler, 15-35 parts of thixotropic agent, 0.2-2 parts of water absorbent, 1-4 parts of synthetic coupling agent and 0.01-1 part of catalyst a. The synthetic coupling agent is prepared by reacting isocyanate b with silane; thesilane is selected from secondary amino silane and / or sulfydryl silane; the thixotropic agent is prepared by reacting a monoamine compound with isocyanate a in the presence of a plasticizer b. According to the polyurethane sealant, the synthetic coupling agent and the polyurethane prepolymer act together, so that primer-free bonding of building concrete can be achieved; due to the addition of thethixotropic agent, the polyurethane sealant has better thixotropic property on the premise of not increasing the strength; therefore, the low modulus characteristic of the polyurethane sealant can also be met, and the curing speed is high.

Description

technical field [0001] The invention belongs to the technical field of polyurethane, in particular to a highly thixotropic, fast-curing single-component low-modulus polyurethane sealant and a preparation method thereof. Background technique [0002] One-component polyurethane sealant is a polyurethane adhesive with isocyanate (NCO) group-terminated polymer as the main active ingredient, and plasticizers, fillers, catalysts, and additives. [0003] Patent Application No. 200510102933.2 discloses a direct bonding polyurethane sealant. The coupling agents used are all commercial silane coupling agents. The direct addition of such coupling agents will affect the curing strength of the polyurethane adhesive. CN111073588A primer-free single-component polyurethane adhesive sealant and its preparation method and CN111378413A primer-free single-component polyurethane sealant and its preparation method adopt similar schemes, and the curing speed of the products is relatively slow. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J11/04C09J11/06
CPCC08K2003/2206C08K2003/265C08K2201/014C09J11/04C09J11/06C09J175/08C08K13/02C08K3/26C08K3/22C08K5/12C08K5/544C08K5/548
Inventor 孙辉杨波周朝栋孟君伟王少杰刘明何永富
Owner HANGZHOU ZHIJIANG NEW MATERIAL CO LTD