Preparation method for polyurethane adhesive

A technology of polyurethane adhesives and prepolymers, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., to achieve good economic benefits

Inactive Publication Date: 2012-02-22
DALIAN JIARUILONG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such synthetic resin adhesives will continuously release phenol and formaldehyde during production, transportation and use, causing environmental problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Heat polyether diol to 120°C, vacuum 1 to remove moisture, add diphenylmethane-4,4'-diisocyanate, the addition ratio is 80% of the mass percentage of polyether diol, in React at 40~60℃ for 1h;

[0015] (2) Add dried dimethylolpropionic acid, the amount added accounts for 10% of the mass percentage of the mixture obtained in step (1), and react at 80°C for 2 hours to prepare a prepolymer;

[0016] (3) Lower the prepolymer to room temperature, add triethylamine aqueous solution, the addition amount is 200% of the mass percentage of the prepolymer, and when the solution turns from yellow to transparent until it becomes milky white, continue to stir for 5 minutes to obtain uniformly dispersed White polyurethane emulsion, and adding sodium polyacrylate to the emulsion, the addition amount is 3% of the mass percentage of the emulsion, to obtain the polyurethane adhesive.

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Abstract

The present invention discloses a preparation method for a polyurethane adhesive. The preparation method comprises the following steps: heating polyether glycol to a temperature of 100-120 DEG C; carrying out vacuum pumping for 1-2 hours to remove moisture; adding diphenylmethane 4,4'- diisocyanate, and carrying out a reaction for 1-3 hours at the temperature of 40-60 DEG C; adding oven-dried dimethylol propionic acid, and carrying out a reaction for 2-6 hours at the temperature of 30-80 DEG C to prepare a prepolymer; cooling the prepolymer to the room temperature; adding an aqueous solution of triethanolamine; continuously stirring for 5-20 minutes when the color of the solution becomes transparent from yellow, and then becomes ivory white to obtain a uniformly-dispersed white polyurethane emulsion; adding a thickening agent to the polyurethane emulsion to obtain the polyurethane adhesive. The prepared polyurethane adhesive of the present invention can solve the harms to the human body and the pollution to the environment due to formaldehyde and volatile organic toxic materials during the wood-based panel production process and the furniture using process, and has characteristics of environmental protection, energy saving and good economic benefits.

Description

technical field [0001] The invention relates to an adhesive, in particular to a preparation method of a polyurethane adhesive. Background technique [0002] At present, my country's wood processing adhesives are still dominated by "trialdehyde glue", accounting for more than 80% of the adhesives used in the entire wood and wood-based panel industry. However, such synthetic resin adhesives will continuously release phenol and formaldehyde during production, transportation and use, causing environmental problems. Research and development of environmentally friendly adhesives. Contents of the invention [0003] The invention provides a polyurethane adhesive to solve the problem of pungent odor and toxic formaldehyde release in the prior art. [0004] A kind of preparation method of polyurethane adhesive, it is characterized in that described preparation method comprises the following steps [0005] (1) Heat the polyether diol to 100-120°C, evacuate for 1-2 hours to remove ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C08G18/66C08G18/48C08G18/12
CPCY02P20/10
Inventor 张晓东
Owner DALIAN JIARUILONG TECH
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