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High-temperature resistant waterborne polyurethane adhesive and preparation method thereof

A water-based polyurethane and adhesive technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of little research on water-based polyurethane adhesives, achieve good high temperature resistance, high bonding strength, The effect of simple method

Inactive Publication Date: 2010-01-27
BEIJING COMENS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is little research on water-based polyurethane adhesives with special uses (such as: high temperature resistance, etc.)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a water-based polyurethane adhesive with high temperature resistance, which can be used as a high temperature resistant insulating material after being composited with non-woven fabrics and PE films, reducing the environmental pollution of solvent adhesives. The adhesive specifically includes:

[0032] polyol, polyisocyanate, acetone, chain extender, salt forming agent, deionized water, secondary chain extender and functional monomer polyvinyl alcohol; wherein, the amount of polyisocyanate is 30% to 30% of the total weight of polyol 45%, the consumption of the acetone is 25%~30% of the total weight of the polyol, the consumption of the chain extender is 5%~8.5% of the total weight of the polyol, the consumption of the salt-forming agent is the total weight of the polyol 4% to 8% of the weight, the amount of the deionized water is 400 to 800 times the total weight of the polyol, and the amount of the secondary chain extender is equimolar to the NC...

Embodiment 2

[0047] Add 100 g of polyoxypropylene diol to a three-necked flask equipped with a thermometer, a reflux tube, and a stirrer, vacuumize and dehydrate the polyoxypropylene diol at 120°C, and cool down to 40-50°C after vacuum dehydration. Add solvent acetone accounting for 26% of the total weight of polyoxypropylene glycol and stir, then add dimethylol propionic acid (DMPA) accounting for 8.5% of the total weight of polyoxypropylene glycol, stir for 5-30min, add 35g of Toluene diisocyanate (TDI), slowly raise the temperature to 85°C within 0.5-1h within 2h, keep it for 2h, take a sample from the body system to detect -NCO% (if the NCO% reaches 2.5-3%, it is up to the standard), if the NCO% is detected If it is unqualified, continue the reaction at this temperature (85°C). If the NCO% is qualified, cool the body system to 40°C, and add 2.5% to 4% of the total weight of polyoxypropylene glycol under stirring. Amine, neutralize the dimethylol propionic acid (DMPA) in the system, sti...

Embodiment 3

[0052] Add 100 g of polyoxypropylene diol to a three-necked flask equipped with a thermometer, reflux tube and stirrer, vacuumize and dehydrate at 120°C, cool down to 40-50°C, and add 26% of the total weight of polyoxypropylenediol Stir with acetone, then add dimethylolpropionic acid (DMPA), the addition of DMPA is 6.0% of the total weight of polyoxypropylene glycol (polyether polyol), stir for 5-30min, add 18.4g of diphenyl For methyl methane-4,4' diisocyanate (MDI), slowly heat up to 85°C, after about 2 hours, take a sample to detect -NCO%; if the NCO% is unqualified, continue the reaction at this temperature, if it is qualified, then cool down to 40 ℃, under stirring, add triethylamine accounting for 2.5% to 4% of the total weight of polyoxypropylene glycol to neutralize dimethylolpropionic acid; after stirring at room temperature for 5 to 30 minutes, add deionized water under stirring, and The amount to be added is 400-800 times that of polyoxypropylene glycol. After addin...

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Abstract

The invention discloses a high-temperature resistant waterborne polyurethane adhesive and a preparation method thereof. The adhesive is prepared through the following steps: adding acetone into a polybasic alcohol and then performing reaction with isocyanic acid to generate a preformed polymer of terminal isocyanate, and simultaneously, introducing a hydrophilic group to the reaction for chain extension; then adding a salt forming agent for salification, adding water for emulsification, and adding a chain extender with particular functions for secondary chain extension; and finally, performing compounding to prepare the high-temperature resistant waterborne polyurethane adhesive. The preparation method of the adhesive is simple, and the prepared adhesive has the advantages of good high-temperature resistance, water resistance, electrical property, stable performance, innocuity and environmental protection, large initial viscous force, high bonding strength, and low activation temperature, can be applied to the adhesions of PET, PE and the like as well as papers, fabrics and non-woven fabrics, and has excellent application prospect.

Description

technical field [0001] The invention relates to a preparation technology of a high-temperature-resistant water-based polyurethane adhesive, in particular to a PET / non-woven composite water-based polyurethane adhesive that can be used as a heat insulating material and a preparation method thereof. Background technique [0002] Waterborne polyurethane adhesive refers to the adhesive formed by dissolving or dispersing polyurethane in water. In the 21st century, environmental protection and health and safety issues have been widely concerned. Water-based adhesives use water as the basic medium, and have the characteristics of non-combustibility, low odor, no environmental pollution, energy saving, and convenient operation and processing. Water-based adhesives can replace solvent-based adhesives, which can improve the working environment, reduce pollution, reduce work intensity, and avoid fires. The danger is very effective. The replacement of solvent-based products by water-ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J9/00C08G18/10
Inventor 张淑萍沈峰
Owner BEIJING COMENS NEW MATERIALS
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