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A kind of polyurethane emulsion adhesive containing superfine talcum powder

A technology of ultra-fine talcum powder and polyurethane emulsion, which is applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc. The effect of high initial adhesion strength, increasing crystallization speed and crystallinity

Active Publication Date: 2020-08-18
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, when nano-fillers are applied in water-based polyurethane adhesives, there is a serious problem of agglomeration and subsequent settlement, which will reduce the bond strength of the product and its construction performance

Method used

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  • A kind of polyurethane emulsion adhesive containing superfine talcum powder
  • A kind of polyurethane emulsion adhesive containing superfine talcum powder

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 hours, add 400g of polyhexamethylene adipate with an aspect ratio of 20:1 , with an average particle size of 1 μm and a specific surface area of ​​500m 2 / g of superfine talc powder, the surface hydroxyl number is 3.0 OH / nm 2 , add 2wt% of dibutyltin dilaurate, continue to stir at 90°C for 1h, then lower the temperature to 50°C, add 1 mol of acetophenone oxime, continue to stir for 2h to obtain prepolymer A, wherein, 2wt% 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 reactor, heat at 60°C, stir for 2 hours, and add 2wt% dilaurel Dibutyltin acid, continue to stir 2 h, obtain prepolymer B, wherein, ...

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

The invention comprises a polyurethane emulsion adhesive containing ultra-fine talcum powder. The ultra-fine talcum powder is used as an end capping agent, and has an effect of reinforcing and inducing polyurethane molecular chain crystallization, the initial adhesion of the adhesive is improved, isocyanato is closed as a potential reaction group by using acetophenone oxime, can further reacts with an active group of an adhesion interface, and thus, the adhesion strength of the adhesive is improved. The prepared polyurethane adhesive has excellent properties including high initial adhesion, high crystallization velocity, high degree of crystallinity, high adhesion 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): C09J175/06C08G18/76C08G18/66C08G18/42C08G18/34C08G18/32C08G18/10
CPCC08G18/10C08G18/3206C08G18/348C08G18/3895C08G18/4238C08G18/6633C08G18/7614C09J175/06
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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