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Ultraviolet-cured polyurethane adhesive and preparation method thereof

A technology of polyurethane adhesives and ultraviolet light, which is applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of unsatisfactory performance of adhesives, increased viscosity of adhesives, restrictions on popularization and application, etc., and achieve curing Fast, increased functionality, simple process effect

Active Publication Date: 2016-05-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is subject to certain restrictions in the promotion and application of
At present, experts and scholars have conducted a lot of research on the shrinkage of cured films of existing UV-curable adhesives, mainly by adding polymers or inorganic fillers, using hybrid curing systems, adding expansion monomers or choosing low shrinkage. However, it leads to problems such as increased viscosity of the adhesive or excessive hardness of the cured film, and the performance of the adhesive is still unsatisfactory.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of preparation method of ultraviolet curing polyurethane adhesive:

[0044] 1. Raw materials, ratio and process of polyurethane acrylate prepolymer:

[0045] Raw materials and proportioning: IPDI (molecular weight 223) 100g, hydroxyethyl acrylate 26g, refined castor oil polyol (hydroxyl value 162mgKOH / g) 933g;

[0046] Process: Add IPDI into the reaction kettle, raise the temperature to 50°C~80°C, then add dropwise vacuum-dried hydroxyethyl acrylate and increase the stirring speed to fully mix with IPDI, and at the same time pass industrial nitrogen for protection, and react After 1 to 2 hours, when the content of isocyanate groups in the system reaches the theoretical value, add castor oil polyol and continue the reaction for 5 to 8 hours. When the content of isocyanate groups in the system is not higher than 0.5% wt, stop the reaction to obtain polyurethane acrylate prepolymerized body;

[0047] Properties of urethane acrylate prepolymer: It is light yellow t...

Embodiment 2

[0056] A kind of preparation method of ultraviolet curing polyurethane adhesive:

[0057] 1. Raw materials, ratio and process of polyurethane acrylate prepolymer:

[0058] Raw materials and proportioning: IPDI (molecular weight 223) 100g, hydroxyethyl acrylate 18.2g, refined castor oil polyol (hydroxyl value 162mgKOH / g) 1213g;

[0059] Process: Add IPDI into the reaction kettle, raise the temperature to 50°C~80°C, then add dropwise vacuum-dried hydroxypropyl acrylate and increase the stirring speed to fully mix with IPDI, and at the same time pass industrial nitrogen for protection, and react After 1 to 2 hours, when the content of isocyanate groups in the system reaches the theoretical value, add castor oil polyol and continue the reaction for 5 to 8 hours. When the content of isocyanate groups in the system is not higher than 0.5% wt, stop the reaction to obtain polyurethane acrylate prepolymerized body;

[0060] Properties of urethane acrylate prepolymer: It is light yell...

Embodiment 3

[0069] A kind of preparation method of ultraviolet curing polyurethane adhesive:

[0070] 1. Raw materials, ratio and process of polyurethane acrylate prepolymer:

[0071] Raw materials and proportioning: IPDI (molecular weight 223) 100g, hydroxypropyl acrylate 29g, refined soybean oil polyol (hydroxyl value 130mgKOH / g) 1001g;

[0072] Process: Add IPDI into the reaction kettle, raise the temperature to 50°C~80°C, then add dropwise vacuum-dried hydroxypropyl acrylate and increase the stirring speed to fully mix with IPDI, and at the same time pass industrial nitrogen for protection, and react After 1 to 2 hours, when the content of isocyanate groups in the system reaches the theoretical value, add castor oil polyol and continue the reaction for 5 to 8 hours. When the content of isocyanate groups in the system is not higher than 0.5% wt, stop the reaction to obtain polyurethane acrylate prepolymerized body;

[0073] Properties of urethane acrylate prepolymer: It is light yell...

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Abstract

The invention provides an ultraviolet-cured polyurethane adhesive and a preparation method thereof. The ultraviolet-cured polyurethane adhesive is mainly prepared from a polyurethane acrylate pre-polymer, a mercapto-terminated photo-initiation monomer and a photo-initiator, wherein the polyurethane acrylate pre-polymer is mainly obtained by reactive synthesis of hydroxyl acrylate, vegetable oil polyol and a polyisocyanate-based compound; the mercapto-terminated photo-initiation monomer is mainly obtained by an esterification reaction of mercaptoundecanoic acid and polyol. The preparation method of the ultraviolet-cured polyurethane adhesive is simple in process, and an obtained ultraviolet-cured polyurethane adhesive cured film has low shrinkage factor, low viscosity, high curing speed, high peeling strength and high heat resistance, is free from volatilization of solvents and VOCs (Volatile Organic Compounds), is easy and convenient to use, and is suitable for bonding of an aluminum-plastic compound or a plastic-plastic compound or a paper-plastic compound.

Description

technical field [0001] The invention relates to the technical field of composite adhesives, in particular to an ultraviolet-curable polyurethane adhesive and a preparation method thereof. Background technique [0002] Solvent-free composite adhesive has gradually become an important composite processing method for plastic composite films because of its economical, safety and environmental protection advantages. Solvent-free composite adhesives have been widely used in developed countries such as Europe and the United States with strong awareness of environmental protection and energy conservation. In my country, with the enhancement of national environmental protection and energy-saving awareness and people's increasing attention to the hygiene and safety of packaging materials, more and more people pay more and more attention to green and environmentally friendly solvent-free laminating adhesives. There are more and more research reports on solvent-free laminating adhesive...

Claims

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Application Information

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IPC IPC(8): C09J175/14C09J11/06C08G18/67C08G18/36
CPCC08G18/36C08G18/672C09J11/06C09J175/14
Inventor 陈广学王青何明辉田君飞
Owner SOUTH CHINA UNIV OF TECH
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