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Reactive polyurethane adhesive for bonding and preparation method thereof

A polyurethane adhesive, reactive technology, applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problems of low peel strength, slow curing rate, high use temperature, etc., to improve the curing rate , easy to coat, moderate temperature effect

Active Publication Date: 2022-08-09
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current PUR has problems such as low initial adhesion, slow curing rate, low peel strength, high service temperature (>160°C), and poor weather resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 A reactive polyurethane adhesive for bonding, the adhesive is composed of the following raw materials: 130 g of norbornane diisocyanate, 4 g of triphenylmethane triisocyanate, 4 g of polyneopentyl adipate Diol (molecular weight 2000) 20 g, polyoxypropylene glycol (molecular weight 2000) 300 g, glycerol oxypropylene polyether (molecular weight 1000) 7 g, neopentyl glycol 33 g, γ-glycidyl ether oxypropyl Trimethoxysilane 0.5 g, ALT-402 0.8 g, bismuth isooctanoate 0.1 g.

[0032] Its preparation method: firstly weigh each raw material according to the proportion; then, polyoxypropylene glycol (molecular weight is 2000), polyoxypropylene glycol (molecular weight is 2000) and glycerol oxypropylene polyether (molecular weight is 2000) are mixed. 1000) at 100~120℃, vacuum degree ≥0.1MPa for 1~3h dehydration under reduced pressure; when the temperature drops to 60~90℃, add norbornane diisocyanate and triphenylmethane triisocyanate while stirring; After the diisocyana...

Embodiment 2

[0040] Example 2 A reactive polyurethane adhesive for bonding, the adhesive is composed of the following raw materials: 80 g of norbornane diisocyanate, 60 g of diphenylmethane diisocyanate, 4 g of triphenylmethane triisocyanate, Polyneopentyl adipate diol (molecular weight 2000) 20 g, polyoxypropylene glycol (molecular weight 2000) 300 g, glycerol propylene oxide polyether (molecular weight 1000) 7 g, neopentyl glycol 33 g, γ-glycidyl ether oxypropyltrimethoxysilane 0.5 g, ALT-4020.8 g, bismuth isooctanoate 0.1 g.

[0041] The preparation method of the reactive polyurethane adhesive is the same as that in Example 1.

[0042] The obtained reactive polyurethane adhesive was used at ~120 ℃ and tested according to ASTM D903-98. The initial peel strength was 53 N / 25mm; the final peel strength was 107 N / 25mm; the time to reach the final peel strength was <5 h.

Embodiment 3

[0049] Example 3 A reactive polyurethane adhesive for bonding, the adhesive is composed of the following raw materials: 39.6 g of toluene diisocyanate, 2 g of triphenylmethane triisocyanate, and polyneopentyl adipate glycol (molecular weight 2000) 7 g, polyoxypropylene glycol (molecular weight 2000) 110 g, glycerol propylene oxide polyether (molecular weight 1000) 2 g, neopentyl glycol 12 g, γ-glycidyl ether oxypropyltrimethoxy Silane 0.15 g, ALT-101 0.3 g, bismuth isooctanoate 0.02 g.

[0050] The preparation method of the reactive polyurethane adhesive is the same as that in Example 1.

[0051] The obtained reactive polyurethane adhesive was used at ~120°C and tested according to ASTM D903-98. The initial peel strength was 36 N / 25mm; the final peel strength was 70 N / 25mm; the time to reach the final peel strength was <9h.

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PUM

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Abstract

The invention relates to a reactive polyurethane adhesive for bonding. The adhesive is prepared from the following raw materials in parts by weight: 39.6 to 175.8 parts of diisocyanate, 0.2 to 5 parts of triphenylmethane triisocyanate, 5 to 50 parts of polyester diol, 100 to 400 parts of polyether diol, 0.5 to 10 parts of polyether triol, 10 to 40 parts of chain extender, 0.1 to 1 part of silane coupling agent, 0.2 to 2 parts of latent curing agent and 0.01 to 0.5 part of catalyst. The invention also discloses a preparation method of the adhesive. The obtained reactive polyurethane adhesive has the advantages of being good in initial adhesion, moderate in use temperature, easy to coat, free of blistering and high in curing speed, and can be widely applied to adhesion of decorative layers and base materials such as solid wood, composite boards and fiberboards with different densities.

Description

technical field [0001] The invention relates to the field of preparation of polyurethane adhesives, in particular to a reactive polyurethane adhesive for bonding and a preparation method thereof. Background technique [0002] Reactive polyurethane hot-melt adhesive (PUR), also known as moisture-curing polyurethane adhesive, is characterized in its structure by isocyanate group-terminated polyurethane. Since it does not require solvent during use, it has environmental protection advantages, and the isocyanate group has high reactivity. , It has excellent bonding properties to wood, fabric, plastic, leather, metal, ceramics, etc., so it is widely respected by enterprises. [0003] In order to meet different aesthetic needs, it is necessary to compound various decorative layers on decorative materials. At present, the commonly used adhesives on the market are solvent-based adhesives. However, due to the limitations of environmental protection, safety, low production efficiency...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C08G18/42C08G18/48C08G18/66C08G18/32
CPCC09J175/04C08G18/4238C08G18/4825C08G18/4018C08G18/4829C08G18/6607C08G18/3206Y02E60/10
Inventor 薛飞李臻夏春谷
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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