Aminosilane-terminated modified polyurethane resin and preparation method thereof

A polyurethane resin and aminosilane technology, applied in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve problems such as poor storage stability, increased resin viscosity, unfavorable SPU sealant preparation, etc., to achieve high viscosity low effect

Active Publication Date: 2019-04-23
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Viscosity increases sharply after adding end-capping agent, as patent CN101348550A discloses a kind of synthetic method of silane-terminated polyurethane prepolymer, this method causes SPU resin viscosity to increase sharply after the prepolymer reaction of functional silane and terminal isocyanate Large, not conducive to the preparation of SPU sealant in the later stage
[0005] (2) The storage stability of SPU resin is poor
The storage stability of SPU is an important performance index thereof. Patent CN105199653A discloses a preparation method of high-strength and low-viscosity silane-modified polyurethane resin. The storage stability of the SPU resin obtained by this method is poor, and the viscosity of the resin increases after storage for one year. Larger, less dry time

Method used

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  • Aminosilane-terminated modified polyurethane resin and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Raw materials for preparing aminosilane-terminated modified polyurethane resin (total mass 100 parts):

[0030] 1) Polyol: Polytetrahydrofurandiol, with an average molecular weight of 1000g / mol, 60 parts;

[0031] 2) Isocyanate: hexamethylene diisocyanate, 15 parts;

[0032] 3) Aminosilane: γ-aminopropyltriethoxysilane, 10 parts;

[0033] 4) Molecular chain regulator; ethanol, 15 parts;

[0034] The preparation method includes the following steps:

[0035] Ⅰ. Under the condition of 70℃, the polytetrahydrofurandiol and hexamethylene diisocyanate are fully mixed and reacted completely to obtain the NCO group-terminated prepolymer;

[0036] Ⅱ. Mix γ-aminopropyltriethoxysilane with the prepolymer in step Ⅱ, and complete the reaction to obtain an aminosilane-terminated polyurethane prepolymer, and measure the mass of NCO groups in the prepolymer The fraction is 1.13wt%;

[0037] Ⅲ. Add ethanol to the prepolymer of step Ⅱ, fully mix and react to completely obtain aminosilane-terminated m...

Embodiment 2

[0073] Raw materials for preparing aminosilane-terminated modified polyurethane resin (total mass 100 parts):

[0074] 1) Polyol 1: Polytetrahydrofurandiol, with an average molecular weight of 600g / mol, 30 parts;

[0075] 2) Polyol 2: ethylene oxide and propylene oxide copolymer diol, with an average molecular weight of 6000g / mol, and a mass ratio of ethylene oxide to propylene oxide of 1:3, 40 parts;

[0076] 3) Isocyanate 1: toluene diisocyanate, 5 parts;

[0077] 4) Isocyanate 2: Diphenylmethane diisocyanate, 5 parts;

[0078] 5) Aminosilane: N-n-butyl-γ-aminopropyltrimethoxysilane, 5 parts;

[0079] 6) Molecular chain regulator; diisopropanolamine, 15 parts;

[0080] The preparation method includes the following steps:

[0081] Ⅰ. Under the condition of 80℃, fully mix polytetrahydrofurandiol, ethylene oxide and propylene oxide copolymer diol, toluene diisocyanate, and diphenylmethane diisocyanate to complete the reaction to obtain NCO group-terminated prepolymerization body;

[0082] Ⅱ...

Embodiment 3

[0086] Raw materials for preparing aminosilane-terminated modified polyurethane resin (total mass 100 parts):

[0087] 1) Polypolyol 1: Polyethylene glycol, with an average molecular weight of 300g / mol, 20 parts;

[0088] 2) Polypolyol 2: Polypropylene glycol, with an average molecular weight of 8000g / mol, 30 parts;

[0089] 3) Isocyanate: 1,4-cyclohexane diisocyanate, 30 parts;

[0090] 4) Aminosilane: N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, 15 parts;

[0091] 5) Molecular chain regulator 1; isobutanol, 2 parts;

[0092] 6) Molecular chain regulator 2; Triglycolamine, 3 parts;

[0093] The preparation method includes the following steps:

[0094] Ⅰ. Mix polyethylene glycol, polypropylene glycol, and 1,4-cyclohexane diisocyanate thoroughly at 90°C and complete the reaction to obtain a prepolymer terminated with NCO groups;

[0095] Ⅱ. Mix N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane with the prepolymer in step Ⅱ, and complete the reaction to obtain an aminosilane-terminated polyur...

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Abstract

The invention discloses an aminosilane-terminated modified polyurethane resin and a preparation method thereof, wherein the aminosilane-terminated modified polyurethane resin is prepared from the following raw materials: 1) polypolyol, 2) diisocyanate, 3) aminosilane, and 4) a molecular chain regulator. The preparation method comprises: I, carrying out a complete mixing reaction on polypolyol andan excess diisocyanate compound to obtain an isocyanate-terminated prepolymer; II, mixing aminosilane and the prepolymer obtained in the step I, and carrying out a reaction to obtain an aminosilane-terminated polyurethane prepolymer; and III, adding a molecular chain regulator to the prepolymer obtained in the step II, and carrying out a complete mixing reaction to obtain the aminosilane-terminated modified polyurethane resin. According to the present invention, the aminosilane-terminated modified polyurethane resin prepared by the method has characteristics of low viscosity, high storage stability and good mechanical property.

Description

Technical field [0001] The invention relates to an aminosilane terminated modified polyurethane resin and a preparation method thereof. Background technique [0002] In recent years, silane-modified polyurethane (SPU) sealants have attracted more and more attention. SPU sealants have foaming properties, curing speed, moisture and heat resistance, heat resistance, adhesion to non-porous materials, and storage stability. It is better than polyurethane sealant and superior to silicone sealant in tear strength, paintability and oil permeability. [0003] Although SPU sealant has many advantages, the preparation technology of SPU resin still has the following problems: [0004] (1) The viscosity increases sharply after adding the blocking agent. For example, the patent CN101348550A discloses a method for synthesizing a silane-terminated polyurethane prepolymer. The method reacts a functional silane with the isocyanate-terminated prepolymer and causes the viscosity of the SPU resin to inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/10C08G18/38C08G18/12C08G18/30C08G18/66C08G18/32C09J175/08
CPCC08G18/10C08G18/12C08G18/4825C08G18/4833C08G18/4837C08G18/4854C08G18/6688C08G2190/00C09J175/08C08G18/289C08G18/282C08G18/3275
Inventor 周明杨杰黄岐善
Owner WANHUA CHEM GRP CO LTD
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