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Preparation method for high temperature-resistant waterborne polyurethane adhesive

A water-based polyurethane and adhesive technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive additives, etc., can solve the problems of poor flame retardancy and poor environmental protection of two-component solvent-based adhesives, etc. Achieve the effects of water resistance and solvent performance improvement, green performance and excellent flame retardant performance

Active Publication Date: 2013-04-03
NANTONG GAOMENG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for preparing a high-temperature-resistant water-based polyurethane adhesive, which has good environmental protection and high-temperature resistance, and can solve the problem of environmental protection of two-component solvent-based adhesives currently used in the construction field. The problem of good and poor flame retardancy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] This embodiment provides a preparation method of an epoxy cross-linked high temperature resistant waterborne polyurethane adhesive. The composite adhesive is green and environmentally friendly, has high bonding strength, flame retardancy, excellent high temperature resistance and solvent resistance, and is an excellent performance Excellent epoxy cross-linked high temperature waterborne polyurethane adhesive, the method comprises the following steps:

[0014] Prepare the main agent:

[0015] After vacuum dehydration of polytetrahydrofuran diol (number average molecular weight 2000), add isophorone diisocyanate, mix uniformly, heat up, add methyl ethyl ketone as solvent, and react at 80-85 ℃ for 3 hours to obtain prepolymer; When the NCO mass percentage of the polymer reaches the theoretical value (that is, the NCO mass percentage of the prepolymer is 3.0 to 4.0%), the temperature begins to cool down to 30°C, and then diethylenetriamine diluted with butanone is added dro...

Embodiment 2

[0031] This embodiment provides a method for preparing an epoxy cross-linked high temperature waterborne polyurethane adhesive. The prepared adhesive is environmentally friendly, has high bonding strength, is flame retardant, has excellent high temperature resistance and solvent resistance, and the method includes the following steps: The following steps:

[0032] After dehydrating 75.9kg polytetrahydrofuran diol (number average molecular weight 2000) in vacuum, adding 20kg isophorone diisocyanate, mixing uniformly, heating up, adding 5kg butanone as solvent, and reacting at 80-85°C for 3 hours to obtain a prepolymer , the NCO mass percentage of the prepolymer is 3.0% (reaching the theoretical value), then start to cool down, cool down to 30 ° C, and then dropwise add 2kg of diethylenetriamine diluted with 15kg butanone, dropwise for half an hour After completion, keep the temperature for 40min, then heat up to 80-90℃, add 0.3kg of epichlorohydrin to cap, stir for 20min, cool ...

Embodiment 3

[0035] This embodiment provides a method for preparing an epoxy cross-linked high temperature waterborne polyurethane adhesive. The prepared adhesive is environmentally friendly, has high bonding strength, is flame retardant, has excellent high temperature resistance and solvent resistance, and the method includes the following steps: The following steps:

[0036] After vacuum dehydration of 78kg polytetrahydrofuran diol (number average molecular weight 2000), add 17.7kg isophorone diisocyanate, mix well, heat up, add 5kg methyl ethyl ketone as a solvent, react at 80-85 ℃ for 3 hours to obtain a prepolymer , the NCO mass percentage of the prepolymer is 3.5% (the theoretical value is reached), then the temperature is lowered to 30 ° C, and then 2.5 kg of diethylenetriamine diluted with 15 kg of butanone is added dropwise for half an hour. After adding, keep the temperature for 40min, then heat up to 80-90℃, add 0.4kg epichlorohydrin to cap, stir for 20min, cool down to 40℃, the...

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Abstract

The invention discloses a preparation method for high temperature-resistant waterborne polyurethane adhesive. The method comprises the following steps: preparation of base resin: generating a NCO-terminated prepolymer with butanone as solvent through the reaction between polyether glycol and diisocyanate, cooling, dripping chain extender, adding epichlorohydrin for terminal sealing, and then adding glacial acetic acid for adjusting the pH value in a range of 5 to 7, adding de-ionized water, stirring at a high speed for dispersing, adding treated nanometer silicon dioxide, adding antifoaming agent, and removing the butanone in vacuum to obtain the base resin of the high temperature-resistant waterborne polyurethane adhesive; and waterborne epoxy resin as curing agent is cross-linked with the base resin to obtain the adhesive. The cationic waterborne polyurethane adhesive, prepared by the method, has higher binding strength for composition of glass fabrics and PET (Polyethylene Terephthalate); as the epichlorohydrin is added in the system, the flame retardance of the adhesive is further improved; and as the epoxy resin is added, the high temperature resistance of the adhesive is improved; and the adhesive is waterborne polyurethane adhesive for the glass fabrics with excellent performance.

Description

technical field [0001] The invention relates to a polyurethane adhesive, in particular to a preparation method of a high temperature resistant water-based polyurethane adhesive. Background technique [0002] In the field of building materials, most manufacturers are still using two-component solvent-based adhesives. The two-component solvent-based adhesive needs to be matured when running off the machine, and the energy consumption is very high; a large amount of solvent is directly discharged during use, causing great environmental pollution; and as a building material, the state requires flame retardant properties. Due to the large use of solvents, Its flame retardant properties are also poor. SUMMARY OF THE INVENTION [0003] The technical problem to be solved by the present invention is to provide a preparation method of a high-temperature-resistant water-based polyurethane adhesive, which has good environmental protection and high temperature resistance, and can solv...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J11/04C09J11/06C09J11/08C08G18/75C08G18/66
Inventor 张淑萍沈峰
Owner NANTONG GAOMENG NEW MATERIAL
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