Aqueous coating compositions containing acetoacetyl-functional polymers, coatings, and methods
An acetoacetyl functional and composition technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of large skin irritation and high cost
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Embodiment 1
[0122] Example 1: Preparation of Acetoacetyl Functional Latex Polymer
[0123] 775.2 parts deionized water and 18.4 parts CO-436 were added to the reactor. The reaction mixture was heated to 75°C under a nitrogen blanket. During heating, a pre-emulsion was formed containing the following components: 336.4 parts deionized water, 12.2 parts CO-436, 0.8 parts ammonium persulfate, 370.0 parts butyl acrylate, 190.2 parts methyl methacrylate, 118.3 parts benzene Ethylene, 78.9 parts AAEM, and 31.5 parts methacrylic acid. Once the reaction mixture reached 75°C, a 5% preemulsion was added to the reactor, followed by a mixture of 2.4 parts ammonium persulfate and 7.5 parts water. The reaction was maintained for 5-10 minutes, at which time it exothermed, then the remaining preemulsion was added to the reaction vessel over 2 hours. During the polymerization, the reaction temperature was maintained at 80°C to 85°C. Once the pre-emulsion was added, the vessel was rinsed with 20 parts o...
Embodiment 2
[0124] Example 2: Preparation of UV-curable acetoacetyl-functional coating composition
[0125] 100 grams of deionized water, 14.2 grams of RHODAPAN UB and 200 grams of EOTMPTA were added to a stainless steel mixing vessel with stirring. The mixture is mixed until a pre-emulsion is formed.
[0126] 1000 grams of the latex polymer of Example 1, 93 grams of deionized water, and 157 grams of the EOTMPTA preemulsion prepared above were added to a stainless steel mixing vessel with agitation. The mixture was then kept under stirring for 8 hours until the EOTMPTA was incorporated into the latex polymer. 15 grams of IRGACURE 500 was then added to the mixture and kept under stirring for an additional 15 minutes. The mixture was then left overnight to release trapped air.
[0127] Exposure of the resulting mixture to ultraviolet light will cure to a hard, chemical resistant finish. The mixture obtained in Example 2 also cured to a hard, chemical resistant finish under electron beam...
Embodiment 3
[0128] Embodiment 3: Preparation of (meth)acrylate functional polyurethane dispersion (PUD) containing TMPTA reactive diluent
[0129] 96.0 parts of TMPTA, 48.0 parts of 4-HBA, 91.4 parts of DESMOPHEN S-105-110 polyester diol, 29.3 parts of DMPA, 9.6 parts of TMP, 258.9 parts of isophorone diisocyanate and 500 ppm of 2,6 di- tert-butyl-4-methylphenol. The reaction mixture was heated to 80° C. under air sparging, at which point 250 ppm DBTDL was added and the reaction was continued until the isocyanate content was below 9.2%. The polyurethane polymer was cooled to 65°C and then neutralized with 22.1 parts of TEA. The polyurethane polymer has a viscosity at 65°C of less than 6,000 centipoise (cps) as measured by a Brookfield DV-I+ viscometer with a No. 31 spindle at 1.5 revolutions per minute (RPM).
[0130] At a processing temperature of 65°C, the (meth)acrylate polyurethane polymer formed above was then dispersed in 895.5 parts of deionized water at room temperature, followe...
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