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Latent curing type single-component polyurethane adhesive and preparation method thereof

A polyurethane adhesive and latent curing agent technology, applied in the field of materials, can solve the problems of affecting the performance of the adhesive, restricting the application and development of the adhesive, and reducing the strength, so as to improve the mechanical properties and bonding properties, improve the surface drying and curing speed, and prevent air bubbles The effect of reducing the number of

Inactive Publication Date: 2019-01-22
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the curing process of ordinary one-component polyurethane adhesives requires the reaction of isocyanate groups (NCO) with moisture in the air to form dibasic or polyamines, the amines further undergo chain extension reactions with isocyanate groups to cure, and the curing process produces CO 2 The gas remains in the material, resulting in pinholes on the surface of the material, which reduces the gloss, internal foaming, and strength, which seriously affects the performance of the adhesive and limits the application and development of the adhesive.

Method used

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  • Latent curing type single-component polyurethane adhesive and preparation method thereof

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Effect test

Embodiment 1

[0023] Embodiment 1: preparation of one-component polyurethane adhesive

[0024] (1) Distill polyether polyol 220 under reduced pressure at 120°C and -0.1MPa for 2 hours, take 100 parts of distilled polyether polyol 220 and add it to a four-port tank with vent pipe, condenser pipe and stirring paddle Go to the flask, pass nitrogen before adding, and gradually increase to 70°C; then slowly add 30 parts of diphenylmethane diisocyanate (MDI) dropwise, add dropwise while stirring, and use di-n-butylene every 30 minutes after the reaction starts. The content of -NCO group in the reaction system was titrated by the amine titration method. When the content of -NCO group reached the theoretical value, the reaction was stopped. This process required 2 hours of reaction to obtain a polyurethane prepolymer.

[0025] (2) the polyurethane prepolymer in the step (1) is cooled to 60° C., and 5.6 parts of 1,4 butanediol are slowly added dropwise to a four-necked flask containing the polyureth...

Embodiment 2

[0027] Embodiment 2: preparation of one-component polyurethane adhesive

[0028] (1) First, polyether polyol 220 was distilled under reduced pressure at 120°C and -0.1MPa for 2 hours, and 100 parts of polyether polyol 220 after distillation was added to a four-wheel tank with vent pipe, condenser pipe and stirring paddle. Put the nitrogen in the mouth of the flask, pass the nitrogen gas before adding, and gradually raise it to 70°C; then slowly add 30 parts of diphenylmethane diisocyanate (MDI) dropwise, and add dropwise while stirring. After the reaction starts, use two normal The content of -NCO group in the reaction system was titrated by butylamine titration. When the content of -NCO group reaches the theoretical value, the reaction is stopped, and this process needs to be reacted for 2 hours to obtain a polyurethane prepolymer.

[0029] (2) the polyurethane prepolymer in the step (1) is cooled to 60° C., and 5.6 parts of 1,4 butanediol are slowly added dropwise to a four...

Embodiment 3

[0031] Embodiment 3: preparation of one-component polyurethane adhesive

[0032] (1) First, polyether polyol 220 was distilled under reduced pressure at 120°C and -0.1MPa for 2 hours, and 100 parts of polyether polyol 220 after distillation was added to a four-wheel tank with vent pipe, condenser pipe and stirring paddle. Put the nitrogen in the mouth of the flask, pass the nitrogen gas before adding, and gradually raise it to 70°C; then slowly add 30 parts of diphenylmethane diisocyanate (MDI) dropwise, and add dropwise while stirring. After the reaction starts, use two normal The content of -NCO group in the reaction system was titrated by butylamine titration. When the content of -NCO group reaches the theoretical value, the reaction is stopped, and this process needs to be reacted for 2 hours to obtain a polyurethane prepolymer.

[0033] (2) the polyurethane prepolymer in the step (1) is cooled to 60° C., and 5.6 parts of 1,4 butanediol are slowly added dropwise to a four...

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Abstract

The invention provides a latent curing type single-component polyurethane adhesive, the adhesive is prepared from the following components in parts by weight: 80-120 parts of polyether polyol, 20-40 parts of isocyanate, 3-10 parts of a chain extender and 0.5-2 parts of a latent curing agent, a preparation method of the adhesive comprises the following steps: preparing a polyurethane prepolymer, cooling the polyurethane prepolymer to 40-60 DEG C, slowly dropwise adding the chain extender into a four-neck flask containing the polyurethane prepolymer so as to obtain a reaction product, slowly dropwise adding the latent curing agent while stirring to the reaction product, and uniformly stirring to obtain the latent curing type single-component polyurethane adhesive.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a latent curing type one-component polyurethane adhesive and a preparation method thereof. Background technique [0002] Polyurethane adhesive is an important part of the rapidly developing polyurethane materials. It has excellent performance and has been widely used in many aspects. It is one of the important varieties among the eight synthetic adhesives. However, since the curing process of ordinary one-component polyurethane adhesives requires the reaction of isocyanate groups (NCO) with moisture in the air to form dibasic or polyamines, the amines further undergo chain extension reactions with isocyanate groups to cure, and the curing process produces CO 2 The gas remains in the material, resulting in pinholes on the surface of the material, resulting in lower gloss, internal foaming, and lower strength, which seriously affects the performance of the adhesive and limits ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C08G18/66C08G18/48C08G18/32C08G18/30C08G18/10
CPCC08G18/10C08G18/48C09J175/08C08G18/3206C08G18/30
Inventor 朱云峰管超崔兆锋冯浪杨菁菁
Owner JIANGSU UNIV OF TECH
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