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Reactive polyurethane hot melt adhesive and preparation method thereof

A polyurethane hot-melt adhesive and reactive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problem that it is difficult to obtain the adhesive performance PUR, and the adhesive strength retention rate is difficult to reach 70% , easy to appear and other problems, to achieve excellent adhesion, enhanced heat resistance, excellent mechanical properties

Active Publication Date: 2018-12-14
CHENGDU GUIBAO SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] It can be seen from the above inventions that it is still difficult to obtain PUR that can guarantee good bonding performance in the environment of water immersion, high humidity and high temperature shock in the market.
For example, after soaking in water and being subjected to high temperature and humidity, it is generally difficult to maintain the bond strength retention rate to 70%. After curing, the water permeability is too strong, and it is especially prone to problems when used in hot and humid environments.

Method used

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  • Reactive polyurethane hot melt adhesive and preparation method thereof
  • Reactive polyurethane hot melt adhesive and preparation method thereof
  • Reactive polyurethane hot melt adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The reactive polyurethane hot-melt adhesive of the present embodiment, the raw material composition is as follows:

[0041] raw material

parts by weight

Polypropylene glycol Mn=2000

45

Poly adipate polyester diol Mn=3000

32

Toluene diisocyanate

16

Hydroxy-terminated acrylate-carbonate copolymer resin Mn=2500

5.5

Additives to enhance water resistance 1

1.25

Dibutyltin dilaurate, dibutyltin diacetate (1:2 mixture by weight)

0.25

[0042] Among them: the structure of additive 1 for enhancing water resistance is:

[0043]

[0044] The preparation method of the reactive polyurethane hot-melt adhesive of the present embodiment follows the steps:

[0045] Step 1. Put polypropylene glycol, polyadipate polyester diol, and hydroxy-terminated acrylate-carbonate copolymer resin into the reaction kettle according to the metering ratio, heat at 120° C., and vacuum dehydrate for 2 hours under stirring.

...

Embodiment 2

[0049] The reactive polyurethane hot-melt adhesive of the present embodiment, the raw material composition is as follows:

[0050]

[0051]

[0052] Among them: the structure of additive 2 for enhancing water resistance is:

[0053]

[0054] The preparation method of this embodiment follows the steps:

[0055] Step 1: Put polypropylene glycol, polyadipate polyester diol, and hydroxyl-terminated acrylate-carbonate copolymer resin into the reaction kettle according to the metering ratio, heat at 140° C., and vacuum dehydrate for 1.5 hours while stirring.

[0056] Step 2, drop the temperature to 100°C and drop in diphenylmethane diisocyanate, 2 The reaction was stirred at 90°C for 1 hour under protection.

[0057] Step 3: Add additive 3 for enhancing water resistance, bismorpholino diethyl ether, vacuumize and stir at 120° C. for 1 hour, and discharge to obtain hot melt adhesive 3 .

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Abstract

The invention discloses a reactive polyurethane hot melt adhesive. The reactive polyurethane hot melt adhesive comprises the following raw materials by weight: 30-60 parts of polyether polyol, 20-40 parts of polyester polyol, 10-20 parts of polyisocyanate, 0.5 to 20 parts of hydroxyl-terminated acrylate-carbonate copolymer resin, 0.5 to 4 parts of an agent for enhancing water resistance and 0.05 to 0.5 part of a catalyst. The invention also provides a preparation method for the reactive polyurethane hot melt adhesive. The reactive polyurethane hot melt adhesive prepared by the invention has excellent adhesion to plastics, metals, wood, glass, etc., good adhesion to low-surface-energy materials such as PP and PE, good heat resistance, and excellent water or moisture tolerance; the reactivepolyurethane hot melt adhesive can be applied to fields that require good bonding of low-surface-energy materials and may be in hot, water or humid environments for a long time, is applicable to fields like automobile manufacturing, woodworking appliances, construction engineering, electronics and the like, and has good market prospects.

Description

technical field [0001] The invention belongs to the technical field of reactive polyurethane hot-melt adhesives, in particular, the invention relates to a reactive polyurethane hot-melt adhesive capable of high-strength bonding and water immersion resistance to low-surface-energy plastics and a preparation method thereof. Background technique [0002] Reactive polyurethane hot melt adhesive (PUR) is a reactive adhesive with excellent initial bonding strength, fast fixation, cross-linking and curing, and also has the characteristics of heat resistance, durability, and high final bonding strength. It is developing rapidly and is widely used in construction. , machinery, automobile, electronics and other industries have extremely high application value. [0003] How to improve the bonding of low surface energy plastics in complex environments is a major problem faced by PUR. These environments include: moisture environment, water immersion, long-term external light source expos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C08G18/66C08G18/48C08G18/42C08G18/62C08G18/32
CPCC08G18/3893C08G18/4063C08G18/42C08G18/48C08G18/6225C08G18/66C09J175/08
Inventor 向青云李世昌杨亮汤淋淋王天强
Owner CHENGDU GUIBAO SCI & TECH