Preparation of an environmentally friendly formaldehyde-removing polymer latex and its application in coatings
A polymer glue, environmentally friendly technology, used in antifouling/underwater coatings, coatings, paints containing biocides, etc. problems such as transportation and use, to achieve the effect of excellent film formation and excellent freeze-thaw stability
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preparation example 1
[0097] Preparation Example 1: Polymer Latex-1
[0098] Add 60g to the four-necked flask equipped with reflux condenser, thermometer and mechanical stirring HDI (hexamethylene diisocyanate), 200g PTMEG2000 (polytetrahydrofuran ether diol), 0.0861g Bicat8108 catalyst, the temperature was raised to 80 °C for 1 h, cooled to below 60 °C, 16g dimethylolpropionic acid, 5g 1,4-butanedi Alcohol and 86.1 g of acetone were heated to 75° C. to react until NCO reached the theoretical value, and the reaction was stopped.
[0099] Cool to 55°C, add 172.2 g of acetone, 90 g of methyl methacrylate, and 108 g of butyl acrylate, and mix and dissolve for 8 minutes.
[0100] The temperature was lowered to below 40°C, 10.63 g of N,N-dimethylethanolamine was added, and the reaction was neutralized for 5 min. The prepared prepolymer was poured into a dispersion cup, and 586 g of water was added under the high-speed shearing condition of 1500 r / min to obtain a water-based polyurethane-acrylate mixe...
preparation example 2
[0103] Preparation Example 2: Polymer Latex-2
[0104] Add 80g to the four-necked flask equipped with reflux condenser, thermometer and mechanical stirring HDI (hexamethylene diisocyanate), 195g PTMEG2000 (polytetrahydrofuran ether diol), 0.083g Bicat8108 catalyst, the temperature was raised to 80°C for 1 h, cooled to below 60°C, 15g dimethylolpropionic acid, 16g 1,4-butane were added Diol and 87 g of acetone were heated to 75° C. to react until NCO reached the theoretical value, and the reaction was stopped.
[0105] Cool to 60° C., add 172 g of acetone, 90 g of methyl methacrylate, and 108 g of butyl acrylate, and mix and dissolve for 5 minutes.
[0106] The temperature was lowered to below 40°C, 10.8 g of N,N-dimethylethanolamine was added, and the reaction was neutralized for 5 min. Pour the prepared prepolymer into a dispersion cup, add 585g of water under the high-speed shearing condition of 1500r / min to obtain a water-based polyurethane-acrylate mixed emulsion, then ...
preparation example 3
[0109] Preparation Example 3: Polymer Latex-3
[0110] Add 60g to the four-necked flask equipped with reflux condenser, thermometer and mechanical stirring HDI (hexamethylene diisocyanate), 200g PTMEG2000 (polytetrahydrofuran ether glycol), 0.0861g Bicat8108 catalyst, the temperature was raised to 80 °C for 1 h, cooled to below 60 °C, 16g dimethylolpropionic acid, 5g 1,4-butanedi Alcohol and 86.1 g of acetone were heated to 75° C. to react until NCO reached the theoretical value, and the reaction was stopped.
[0111] The temperature was lowered to below 60° C., 172.2 g of acetone, 90 g of methyl methacrylate, and 108 g of butyl acrylate were added, and mixed and dissolved.
[0112] The temperature was lowered to below 40°C, 10.63 g of N,N-dimethylethanolamine was added, and the reaction was neutralized for 5 min. Pour the prepared prepolymer into a dispersion cup, add 586g of water under the high-speed shearing condition of 1500r / min to obtain a water-based polyurethane-ac...
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