Aqueous polyurethane adhesive and preparation method thereof
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A technology of water-based polyurethane and adhesive, applied in the field of water-based polyurethane adhesive and its preparation, achieves the effects of good stability, improved working environment and simple preparation process
Inactive Publication Date: 2012-06-27
东莞市山力高分子材料科研有限公司
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Problems solved by technology
[0004] However, the current water-based polyurethane adhesive requires good stability and
Method used
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Embodiment 1
[0029] [Preparation of aromatic polyester diol]:
[0030] Add aromatic dicarboxylic acid and dihydric alcohol into the reaction kettle with condenser and stirrer accurately according to the metering, heat up and pass N 2 Protection, dehydration and esterification when the temperature rises to 170~230°C, control the speed, temperature and reaction time of the water, wait until the acid value and hydroxyl value are set, and then vacuumize to obtain an aromatic polyester diol with a molecular weight of 2004 .
[0031] [Preparation of water-based polyurethane adhesive] by parts by weight, including the following components:
[0032] A mixture of aromatic polyester diol (PAD), polybutylene adipate (PBA) and polytetrahydrofuran diol (PTMG): 100 parts;
[0043] Its preparation method is with embodiment 1.
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Abstract
The invention discloses an aqueous polyurethane adhesive and a preparation method thereof. The aqueous polyurethane adhesive comprises, by weight, 100 parts of polyester polyol, 30 parts of isocyanate, 7-8 parts of auxiliary agent and the balance of deionized water. The preparation method comprises steps of: dehydrating polyester polyol, adding isocyanate, dimethylolpropionic acid, trimethylol propane and N-methyl pyrrolidone and adding dropwise a catalyst to obtain a performed polymer; then adding acetone and triethylamine for neutralization into salt; dispersing the mixture into deionized water with high speed shearing and carrying out emulsification; adding ethene diamine for chain extension and steaming out acetone with reduced pressure. The method of the invention has a simple technology, is practical and employs self-made aromatic polyurethane polyol; an R value, namely a value of NCO / OH is controlled at 1.4, and an addition of the DMPA is 3.5%; and the prepared aqueous polyurethane adhesive has strong Initial adhesion and good stability.
Description
technical field [0001] The invention relates to a water-based polyurethane adhesive with strong initial tack and good stability and a preparation method thereof. Background technique [0002] At present, the polyurethane adhesives used in the shoemaking and luggage and leather goods industries are all formulated with solvents such as toluene, xylene, crude toluene, acetone, and methyl ethyl ketone. During use, it will pollute the atmosphere, pose a potential hazard to humans, and is flammable and explosive. [0003] Water-based polyurethane adhesives use water as the basic medium, and have the advantages of non-combustibility, non-toxic, non-polluting, good adhesion, film-forming properties, and excellent mechanical properties. The research and development of waterborne polyurethane has become an important research direction in the field of polyurethane today, and its application is becoming more and more extensive. [0004] However, the current water-based polyurethane ad...
Claims
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