Preparation method of environment-friendly aqueous polyurethane coating of polypropylene carbonate type
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A polypropylene carbonate and water-based polyurethane technology is applied in the field of preparation of environment-friendly polypropylene carbonate-based water-based polyurethane coatings to achieve the effects of high storage stability, strong adhesion and uniform distribution.
Inactive Publication Date: 2014-04-30
GUANGDONG UNIV OF TECH
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There is no report on the use of organic bismuth catalysts to synthesize p
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Embodiment 1
[0021] In parts by weight, after dehydrating 100 parts of polypropylene carbonate polyol with a molecular weight of 1000, add 60 parts of hexamethylene diisocyanate and 0.05 parts of bismuth isooctanoate, heat up to 50°C, react for 5 hours, and cool down to 40°C , add 6 parts of dimethylolpropionic acid, heat up to 50°C, react for 5 hours, cool down to 0°C, add 0.5 parts of triethylamine, add 0.5 parts of acetone, stir well, add 1 part of 1,4-butanediol , and then add 210 parts of deionized water, emulsify at 0°C for 0.1h, remove acetone under reduced pressure, and obtain an environment-friendly polypropylene carbonate-based waterborne polyurethane coating.
Embodiment 2
[0023] In parts by weight, after dehydrating 100 parts of polypropylene carbonate polyol with a molecular weight of 2000, add 40 parts of toluene diisocyanate, 0.1 part of bismuth neodecanoate, heat up to 85°C, react for 1 hour, cool down to 40°C, add 12 parts of dimethylol butyrate half ester, heat up to 70°C, react for 1 hour, cool down to 0°C, add 8 parts of dimethylcyclohexylamine, add 20 parts of acetone, stir well, add 3 parts of ethylene glycol, Then add 350 parts of deionized water, emulsify at 0°C for 2 hours, and remove acetone under reduced pressure to obtain an environment-friendly polypropylene carbonate-based waterborne polyurethane coating.
Embodiment 3
[0025] In parts by weight, after dehydrating 100 parts of polypropylene carbonate polyol with a molecular weight of 1500, add 50 parts of 4,4'-diphenylmethane diisocyanate and 1 part of bismuth isooctanoate, heat up to 85°C, and react for 1 hour , lower the temperature to 50°C, add 16 parts of dimethylol propionic acid, raise the temperature to 80°C, react for 1 hour, cool down to 0°C, add 18 parts of tripropylamine, add 40 parts of acetone, stir well, then add diethylene diethylene glycol Add 4 parts of alcohol, then add 300 parts of deionized water, emulsify at 5°C for 0.5 h, remove acetone under reduced pressure, and obtain an environmentally friendly polypropylene carbonate-based waterborne polyurethane coating.
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Abstract
The invention discloses a preparation method of an environment-friendly aqueous polyurethane coating of a polypropylene carbonate type. The aqueous polyurethane coating is synthesized by using a two-step method. The method comprises the following steps: performing a reaction on a polypropylene carbonate polyalcohol, an isocyanate and an organic bismuth catalyst at 50 DEG C to 100 DEG C; then cooling and performing chain extension by adding a hydrophilic chain extender; neutralizing; crosslinking; and emulsifying. Compared with a polyether-type aqueous polyurethane coating, the aqueous polyurethane coating provided by the invention has the advantages of high strength, good adhesive force and good abrasion resistance; compared with a polyester-type aqueous polyurethane coating, the aqueous polyurethane coating provided by the invention has the advantages of high storage stability, hydrolysis resistance and the like; and meanwhile, the environment-friendly organic bismuth catalyst is used for replacing an organic tin catalyst which is harmful to the environment, so that the aqueous polyurethane coating provided by the invention is an environment-friendly product. The polypropylene carbonate polyalcohol is prepared from carbon dioxide taken as a raw material, so that the aqueous polyurethane coating provided by the invention is low in cost and good in market prospect.
Description
technical field [0001] The invention relates to a preparation method of an environment-friendly polypropylene carbonate type waterborne polyurethane coating. Background technique [0002] Traditional polyurethane coatings are generally solvent-based, and a large amount of solvents such as toluene, benzene, and xylene need to be added during synthesis, which causes great harm to the human body and the environment. Water-based polyurethane coatings have the characteristics of non-toxicity, good adhesion and film-forming properties, and excellent physical and mechanical properties of the film. The product has no volatile organic gases. In recent years, the research, development and application of water-based polyurethane coatings have attracted more and more attention. [0003] Polyol is one of the important raw materials for synthesizing water-based polyurethane. Generally, polyol is divided into polyether polyol and polyester polyol. The water-based polyurethane product corre...
Claims
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