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A process for preparing polyurethane powder adhesive by using polyurethane prepolymer reverse phase suspension polymerization method

A technology of polyurethane prepolymer and polyurethane powder, which is applied in the field of polymer chemistry, can solve the problems of endangering the health of workers, time-consuming process, and high production cost, and achieves the effects of convenient implementation, controllable softness and hardness, and easy construction

Active Publication Date: 2020-06-02
ZHUHAI COLLEGE OF JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although the polyurethane adhesive has been improved in form, it will cause dust pollution after mechanical crushing and sieving of solids, which will endanger the health of workers
The process is time-consuming, the process is cumbersome, and the production cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Add chain extender ethylenediamine into liquid paraffin (mass ratio 1:6), heat in a water bath to 50°C, and stir for 5 minutes at a rotational speed of 600r / min to obtain a water-in-oil dispersion mixed liquid;

[0036] (2) Keep the water-in-oil dispersion system at a constant temperature to 50°C, slowly add polyurethane prepolymer (the mass ratio of polyurethane prepolymer to liquid paraffin is 1:25), and carry out chain extension reaction for 50 minutes to obtain suspension in water;

[0037] (3) Add water-based polyurethane hardener (the mass ratio of water-based polyurethane hardener to polyurethane prepolymer is 1:5), solid particles appear in about 6-8 minutes, and the whole process continues to stir and react for 40 minutes, and the temperature is cooled to obtain a solid containing polyurethane glue The suspension of the particles; after filtering and drying at 30°C, the polyurethane powder glue of the present invention can be obtained.

[0038] Wherein, wh...

Embodiment 2

[0040] (1) Add the chain extender ethylenediamine to the recovered liquid paraffin obtained in Example 1 (mass ratio: 1:8), heat it in a water bath to 40°C, and stir for 10 minutes at a speed of 800r / min to obtain water-in-oil Dispersion system mixture;

[0041] (2) Keep the water-in-oil dispersion system at a constant temperature to 40°C, slowly add polyurethane prepolymer (the mass ratio of polyurethane prepolymer to recovered liquid paraffin is 1:40), and carry out chain extension reaction for 60 minutes to obtain oil Water-encapsulated suspensions;

[0042] (3) Add water-based polyurethane hardener (the mass ratio of water-based polyurethane hardener to polyurethane prepolymer is 1:8), and solid particles appear in about 4-6 minutes. The whole process continues to stir and react for 30 minutes, and the temperature is cooled to obtain a solid containing polyurethane glue. Suspension of particles. After filtering and drying at 30°C, the polyurethane powder glue of the pres...

Embodiment 3

[0044] (1) Add the chain extender ethylenediamine to the recovered liquid paraffin obtained in Example 1 (mass ratio: 1:7), heat it in a water bath to 55°C, and stir for 15 minutes at a speed of 800r / min to obtain water-in-oil Dispersion system mixture;

[0045] (2) Keep the temperature of the water-in-oil dispersion system mixture at 55°C, slowly add the polyurethane prepolymer (the mass ratio of the polyurethane prepolymer to the recovered liquid paraffin is 1:50), and carry out the chain extension reaction for 50 minutes to obtain the oil Water-encapsulated suspensions;

[0046] (3) Add water-based polyurethane hardener (the mass ratio of water-based polyurethane hardener to polyurethane prepolymer is 1:10), solid particles appear in about 2-5 minutes, and the whole process continues to stir and react for 30 minutes, and the temperature is cooled to obtain a solid containing polyurethane glue Suspension of particles. After filtering and drying at 30°C, the polyurethane po...

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Abstract

The invention relates to a process for preparing a polyurethane powder adhesive by utilizing a polyurethane prepolymer reversed phase suspension polymerization method. The process comprises the steps that diamine and a compound chain extender are added into an inert oil phase, and a water-in-oil dispersing system is formed under heating and stirring in a water bath; a polyurethane prepolymer and a waterborne polyurethane hardening agent are sequentially and dropwise added for polymerization reaction, and a powdery polyurethane adhesive can be obtained through filtration and drying. The process has the advantages that oil-phase liquid obtained through filtration can be cyclically used and is economic and environmentally friendly, and the preparation time is shortened. The process route is convenient and easy to operate, the polyurethane powder adhesive can meet the requirements of adhesives in multiple fields, and large-scale production is hopeful in the future.

Description

technical field [0001] The invention relates to a method for preparing a polyurethane powder adhesive, in particular to a process for preparing a polyurethane powder adhesive by using a polyurethane prepolymer reverse-phase suspension polymerization method, and belongs to the field of polymer chemistry. Background technique [0002] Polyurethane adhesives have the advantages of adjustable hardness, low temperature resistance, good flexibility, and high bonding strength. They can bond a variety of materials and are widely used in shoemaking, packaging, woodworking, and building paving. [0003] At present, the entire polyurethane adhesive industry is still dominated by solvent-based liquid adhesives. Solvent-based polyurethane liquid adhesives are volatile and contain harmful ingredients. During the production process, the harmful ingredients are easy to volatilize into the workshop, which will affect the health of production workers. During the use process, the volatilizatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/04C08G18/32C08G18/10
CPCC08G18/10C09J175/04C08G18/3228C08G18/3206
Inventor 任秀娥孙明芬孟凡欣王洪艳陈可丹李健斌
Owner ZHUHAI COLLEGE OF JILIN UNIV
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