A kind of polyurethane emulsion adhesive containing nano-cellulose whiskers and preparation method thereof

A nanocellulose, polyurethane emulsion technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of settling, weakening the performance of adhesives, etc. Convenience of use effect, effect of good use effect

Active Publication Date: 2020-08-11
镇江市江冠电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the nanocellulose whiskers are simply mechanically mixed with the water-based polyurethane adhesive, due to the strong internal hydrogen bond, long-term storage will cause the nanocellulose whiskers to reunite, which will cause serious settlement problems. Severely impairs the performance of the adhesive

Method used

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  • A kind of polyurethane emulsion adhesive containing nano-cellulose whiskers and preparation method thereof
  • A kind of polyurethane emulsion adhesive containing nano-cellulose whiskers and preparation method thereof
  • A kind of polyurethane emulsion adhesive containing nano-cellulose whiskers and preparation method thereof

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Effect test

preparation example Construction

[0022] A preparation method of a polyurethane emulsion adhesive containing nanocellulose whiskers, comprising the following steps:

[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 60-70°C for 2-3 hours, and add an aspect ratio of 200 , the specific surface area is 200m 2 / g, surface hydroxyl number is 30.0OH / nm 2 Add 2wt% dibutyltin dilaurate, continue to stir for 1-2h at a temperature of 80-90°C, then lower the temperature to 50°C, add 1mol of acetophenone oxime, and continue to stir for 2h to obtain the desired Polymer 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 reactor, heat at 60°C, stir for 2 hours, and add 2 wt% of dilauric ac...

Embodiment 1

[0039]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 100 g of polyhexamethylene adipate diol with a specific surface area of ​​200 200m 2 / g, surface hydroxyl number is 30.0OH / nm 2 Add 2wt% of dibutyltin dilaurate, continue to stir for 1h at a temperature of 90°C, then lower the temperature to 50°C, add 1mol of acetophenone oxime, and continue to stir for 2h to obtain prepolymer A. Wherein, 2wt% is based on the sum of polyhexamethylene adipate diol and toluene diisocyanate;

[0040] Step 2: 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 h, add 2 wt % of dibutyltin dilaurate, and continue stirring for 2 h. Obtain prepolymer B, wherein, 2wt% is based on the sum of polyhexamethylene adipate diol and toluene diisocyanate;

[0041...

Embodiment 2

[0045] 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 2h; the temperature of the second section is 80°C, and the stirring time is 2h; the first section of step three The stage temperature is 60°C, the stirring time is 2h, and the viscosity of the system is 4000mPa·s. The properties of the adhesive are shown in Table 1.

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Abstract

The invention discloses a polyurethane emulsion adhesive containing nano-cellulose whiskers and a preparation method thereof. The nano-cellulose whiskers are taken as an end-capping reagent and achieve effects of reinforcing and inducing crystallization of polyurethane molecular chains, so that initial adhesion of the adhesive is improved; and moreover, acetophenone oxime blocked isocyanate further serves as a potential reactive group and can be further reacted with an active group on a bonding interface, so that the bonding strength of the adhesive is improved. The prepared polyurethane adhesive has excellent properties such as high initial adhesion, high crystallization speed, high degree of crystallinity, high heat resistance, high bonding 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 and a preparation method thereof. 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 cryst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C08G18/76C08G18/66C08G18/64C08G18/42C08G18/34C08G18/32C08G18/10
CPCC08G18/10C08G18/4238C08G18/6484C08G18/7614C09J175/06C08G18/348C08G18/3206C08G18/64
Inventor 王经逸杭祖圣陆涛张家宾侍惠东郭飞宇沈云海卿俊臣
Owner 镇江市江冠电器有限公司
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