A polyurethane emulsion adhesive containing nano-organic montmorillonite

A polyurethane emulsion, nano-organic technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive additives, etc., to increase the initial adhesive strength, increase the crystallization speed and crystallinity, improve the initial adhesive The effect of bond strength

Active Publication Date: 2020-08-07
江苏光辉粘合科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, research on waterborne polyurethane at home and abroad is mainly focused on the utilization of new materials, such as the design and selection of crosslinking agents, the selection of modified additives, etc., and there are few reports on the study of nanofillers to promote the crystallization speed of polyurethane

Method used

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  • A polyurethane emulsion adhesive containing nano-organic montmorillonite
  • A polyurethane emulsion adhesive containing nano-organic montmorillonite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1: Under the protection of nitrogen, add 1 mol of polyhexamethylene adipate diol and 2 mol of toluene diisocyanate, stir evenly, react at a temperature of 60°C for 3 h, add 200g of nano-organic montmorillonite , add 2 wt% dibutyltin dilaurate, continue to stir at 90°C for 1 h, then lower the temperature to 50°C, add 1 mol of acetophenone oxime, continue to stir for 2 h to obtain prepolymer A, wherein, 2wt % is based on the sum of polyhexamethylene adipate diol and toluene diisocyanate;

[0024] Step 2: Under the protection of dry nitrogen, add 10 mol of polyhexamethylene adipate diol with a molecular weight of 4000 and 20 mol of toluene diisocyanate into the reaction kettle, heat at 60°C, stir for 2 hours, and add 2wt% dilaurel Dibutyltin acid, continue to stir 2 h, obtain prepolymer B, wherein, 2wt% is based on the sum of polyhexamethylene adipate glycol and toluene diisocyanate;

[0025] Step 3: Add 5 mol dimethylolpropionic acid to the prepolymer B obtained in ...

Embodiment 2

[0029] Repeat the method of Example 1 according to the specified content of each component, but the temperature of the first section in step one is 70 ° C, and the stirring time is 2 h; the temperature of the second section is 80 ° C, and the stirring time is 2 h; The temperature of the first stage is 60°C, the stirring time is 2h, and the viscosity is adjusted to 4000mPa·s.

[0030] The properties of the adhesive are shown in Table 1.

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Abstract

A nanometer organic montmorillonite-containing polyurethane emulsion adhesive adopts nanometer organic montmorillonite as an end-capping agent to achieve the effects of reinforcing and inducting crystallization of a polyurethane molecular chain and improve the initial adhesion of the adhesive; and furthermore, acetophenone oxime closed isocyanate serves as a potential reactive group and can further react with an active group on an adhesion interface, so that the adhesive strength of the adhesive is improved. The prepared polyurethane adhesive has excellent properties of high initial adhesion,high crystallization speed, high crystallinity degree, high adhesive strength and the like.

Description

technical field [0001] The invention relates to the field of polyurethane adhesives, in particular to a high-performance water-based polyurethane emulsion adhesive with high initial tack, fast crystallization speed and high crystallinity. Background technique [0002] Waterborne polyurethane adhesives have gradually become the mainstream of the adhesive market due to their advantages of no pollution, easy transportation and friendly working environment. However, water-based polyurethane adhesives have disadvantages such as slow drying speed, low initial adhesion and poor water resistance, especially low initial adhesion, which seriously affects the construction convenience of polyurethane adhesives and limits the application of water-based polyurethane adhesives. Further development. [0003] The crystallization speed of polyurethane molecular chain is one of the important factors to determine the initial adhesion of polyurethane. The crystallization speed of the molecular...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C09J11/04C08G18/66C08G18/42C08G18/34C08G18/32C08G18/28C08G18/10
CPCC08G18/10C08G18/286C08G18/289C08G18/3206C08G18/348C08G18/4238C08G18/6659C08K3/346C08K2201/011C09J11/04C09J175/06
Inventor 丁逸峰杭祖圣王经逸陈志峰张国盛周胜一
Owner 江苏光辉粘合科技有限公司
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