|
With the enhancement of environmental awareness of people of all ages, in order to meet the requirements waterborne coatings. The two-component waterborne acrylic polyurethane coating has a highly cross-linked to an excellent performance solvent based paint to gradually replace the current society. Reviewed this thesis, the synthesis of two-component waterborne fluoropolymer acrylic urethane (WFPUA), principles, methods, and further leads to the synthesis of this dissertation thinking, synthesis and water-based polyurethane aqueous polyhydroxy fluorinated acrylate (OH-WFPA) ( WPU) synthesis has conducted extensive research to conduct a comprehensive study and WFPUA synthesis and performance has been a lot of practical conclusions: first with tris (hydroxymethyl) propionic acid (TMP), maleic anhydride (MA) was synthesized containing two hydroxyl groups, one carboxyl group and the ethylenically functional monomer containing one double bond and carboxyl group-containing half-ester diol (MA-TMP). Studied the degree of drying of the reactants, reaction temperature, reactant ratio, and other factors, the impact of the synthesis result and its acid number change. Koh titration, of infrared spectroscopy half ester acid value changes and synthesis results. The study showed that the degree of drying of the reaction was significantly affect the acid value of the change, the temperature before the reaction occurred 30min should be controlled at 50 ℃, then temperature is controlled at about 65 ℃ better. First introduced in order to prepare the acrylic acid ester component of the high hydroxyl MA-TMP by soap-free emulsion by a carboxyl group-containing half-ester diol (MA-TMP), methyl methacrylate, butyl acrylate and methyl acrylate, hexafluoroisopropyl Dioxide radical copolymerization, the synthetic aqueous polyhydroxy fluorinated polyacrylate emulsion (B component OH-WFPA). Soap-free emulsion with environmental protection, low-cost, and performance characteristics. Synthesis of fluorine-containing aqueous polyhydroxy polyacrylates, through the carboxyl group-containing half-ester diol polyacrylate not only the introduction of a hydrophilic component of the carboxyl group (-COOH), while each introduction of a carboxyl group-containing half-ester diol introduced two with the isocyanate-reactive hydroxy (-OH) components. More monohydroxy acrylic in the the synthetic acrylic polyurethane traditional practices introduced in polyurethane both ends of the double bond, then with alkenes acrylate copolymer, the introduction of the double bond is very limited. Environmental issues gained much attention, soap-free emulsion of soap-free emulsion deeply concerned about, and has a special feature high stability and high solid content is now the hot soap-free emulsion. And study of the initiator, the reaction temperature, the fluorine content, the hydroxyl group content of its emulsion. 2,4 - toluene diisocyanate (TDI) and poly capric acid alcohol the dimethylol propionic Synthesis aqueous polyurethane prepolymer component A (WPU); influences of reaction temperature, and such pairs The polyurethane prepolymer emulsion. Having a proper hardness and flexibility in order to improve the degree of crosslinking at the same time, the first time through such an aqueous polyhydroxy fluorinated acrylate with an aqueous polyurethane prepolymer was prepared by mixing an aqueous two-component fluorinated acrylic urethane coating (WFPUA), this thesis text the performance such WFPUA of the hydroxyl value of the content (degree of crosslinking), the amount of fluoromonomer, OH-WFPA and WPU ratio. The results showed that the OH-WFPA of the synthesis reaction temperature at about 80 ℃, when the hydroxyl value of 100mg / g, i.e. the hydroxyl mass fraction in OH-WFPA polymer reached 6.5%, the relative performance of the two-component coating film better WFPUA in fluoride content of 5.1%.
|