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A kind of aqueous polyurethane adhesive and preparation method thereof

A technology of water-based polyurethane and manufacturing method, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc. The effect of excellent strength and durability, excellent non-yellowing properties

Active Publication Date: 2011-12-14
烟台道成化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the industrialized products with better performance are anionic emulsions using dimethylolpropionic acid (DMPA) as a hydrophilic chain extender, and N-methylpyrrolidone (NMP) is generally used as a cosolvent in its production process, while NMP has a high boiling point and will remain in the product, so strictly speaking, it is still not a completely non-toxic and environmentally friendly product; in recent years, foreign reports have reported that NMP is an irritating and toxic substance, and almost all water-based polyurethanes in the market today contain NMP, which is regulated by the European Union The working group of this matter decided that in the future, all formulations with a mass fraction of NMP higher than 5% will be classified as toxic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of manufacture method of waterborne polyurethane adhesive, comprises following technological process:

[0041] 1. Preparation of polyurethane prepolymer

[0042] Melt and mix polycaprolactone-polyether-polycaprolactone triblock polyol and tertiary amine polyether at a mass ratio of 1:0.1 at a temperature of 100°C, vacuum dry at 80°C for 1 hour, and cool down To 60°C, add 1% N-methyldiethanolamine accounting for the mass percentage of the above molten mixture, mix well and then add hexamethylene diisocyanate (HDI) accounting for 5% of the above molten mixture and 0.1% of the above molten mixture. Dibutyltin laurate, reacted 1 hour, made polyurethane prepolymer, and reaction equation is:

[0043] HO-R...R-OH+OCN...NCO→OCN...R-R...NCO;

[0044] Polycaprolactone-polyether-polycaprolactone triblock polyol, its average molecular weight is between 1000-6000, wherein the mass ratio of polycaprolactone and polyether is 1:0.5;

[0045] Tertiary amine polyether, its mole...

Embodiment 2

[0056] A kind of manufacture method of waterborne polyurethane adhesive, comprises following technological process:

[0057] 1. Preparation of polyurethane prepolymer

[0058] Melt and mix polycaprolactone-polyether-polycaprolactone block polymer and polyether polyol containing tertiary amine structure in a ratio of 1:1 by mass, at a temperature range of 160°C, and vacuum at 100°C Dry for 5 hours, lower the temperature to 70°C, then add tertiary amine structure-containing small molecule polyol N-ethyldiethanolamine accounting for 10% by mass of the above molten mixture, mix well and add isocyanate isophor accounting for 30% of the above molten mixture Ketone diisocyanate (IPDI), 4,4'-dicyclohexylmethane diisocyanate (HMDI) and organotin dibutyltin dilaurate accounting for 0.1-0.001% of the mass percentage of the above molten mixture were reacted for 4 hours to obtain polyurethane prepolymer , the reaction equation is:

[0059] HO-R...R-OH+OCN...NCO→OCN...R-R...NCO;

[0060]...

Embodiment 3

[0075] A kind of manufacture method of water-based polyurethane adhesive, its special feature is to comprise following technological process:

[0076] 1. Preparation of polyurethane prepolymer

[0077] Melt and mix polycaprolactone-polyether-polycaprolactone block polymer and polyether polyol containing tertiary amine structure at a mass ratio of 1:0.5 at a temperature range of 130°C, vacuum at 90°C Dry for 3 hours, cool down to 65°C, then add tertiary amine structure-containing small molecule polyol triethanolamine accounting for 6% by mass of the above molten mixture, mix evenly, add isocyanate accounting for 17% of the above molten mixture and The organotin dibutyltin dilaurate of percentage 0.05%, reacted 2.5 hours, made polyurethane prepolymer, and reaction equation is:

[0078] HO-R...R-OH+OCN...NCO→OCN...R-R...NCO;

[0079] Polycaprolactone-polyether-polycaprolactone block polymer, its average molecular weight is between 1000-6000, wherein the mass ratio of polycaprol...

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PUM

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Abstract

The invention relates to a waterborne polyurethane adhesive and a manufacturing method thereof, and belongs to the technical field of polymer materials. The manufacturing method comprises the following processing steps: 1. preparing polyurethane prepolymer; 2. performing a neutralization reaction; 3. preparing a waterborne polyurethane dispersion; 4. preparing waterborne polyurethane; 5. preparing the waterborne polyurethane adhesive. According to the invention, polymeric polyols and isocyanate are pre-polymerized, and pre-chain extension of micromolecular polyols are performed to prepare the prepolymer; processes of highly shearing emulsification in water and chain extension tackification are performed after neutralization; the obtained polyurethane emulsion has a structured molecular structure and good adaptability to bonding process.

Description

technical field [0001] The invention relates to a water-based polyurethane adhesive and a manufacturing method thereof, belonging to the technical field of polymer materials. Background technique [0002] China is a big country in the shoemaking industry, accounting for more than half of the world's shoemaking output. As a labor-intensive shoemaking industry, solvent-based shoe glue still dominates in China. In the shoemaking industry, female employees play a major role. In the environment of volatile solvents, not only will it cause mental fatigue, but more seriously, it will easily lead to serious occupational diseases, and even bring serious harm to the next generation of female workers. In addition, because most organic solvents are flammable, and most organic mixtures will cause air pollution and smog generation, when the content in the air reaches a certain level, it is easy to ignite or cause an explosion; [0003] Waterborne polyurethane adhesive refers to the adhes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C08G18/66C08G18/48C08G18/12
Inventor 吕宁华刘振波
Owner 烟台道成化学有限公司
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