Preparation and application of calcium benzoate_Kain Industrial Additive

Background and overview^[1]

The chemical formula of calcium benzoate is Ca(C₇H₅O₂)₂·3H₂O, molecular weight 336.36, colorless orthorhombic crystal, relative density 1.436, soluble in water, lost at 114°C 3 molecules of water. The problems with the traditional method of processing and synthesizing calcium benzoate are: it requires a large amount of alkali and acid during the production process, which is relatively expensive; it also produces a large amount of salty wastewater, which is about 4-5 times the weight of the product; it must go through Processes such as separation, drying, and mechanical crushing consume a lot of energy; the processing process requires a lot of equipment, requires a lot of investment, causes dust pollution, and requires high labor intensity for workers.

Preparation^[2]

A processing method for low-temperature synthesis of calcium benzoate, which is characterized by: using 65-85Kg of industrial-grade benzoic acid, 28-32Kg of calcium hydroxide, catalyst triethyl distearate, ethanol 1-3Kg of ethylene distearamide, ethylene bislauric amide, 300-500Kg of clean water, heat and stir in the reaction kettle, control the heating temperature at 60-90°C, stir and react for 2-4 hours, add 5-15Kg of isolation agent , then stir for half an hour, filter and dry. During the specific implementation, the weak acidity of benzoic acid and the alkalinity of calcium hydroxide are utilized, using 75Kg of industrial-grade benzoic acid, 30Kg of calcium hydroxide, and the catalysts triethyl distearate, ethylene distearamide, and ethylene bilaurin. 2Kg of amide and 400Kg of clean water are heated and stirred in the reaction kettle. The heating temperature is controlled at 80°C. After stirring and reacting for 3 hours, add 12Kg of isolating agent, then stir for half an hour, filter and dry to achieve better fineness. Product yield averaged 99.5%.

Application^[3-4]

CN201611133851.9 discloses an antibacterial and weather-resistant polyurethane coating and a preparation method thereof, which consists of the following raw materials in parts by weight Formulated with: polyethylene adipate glycol 100-120, polytetrahydrofuran ether glycol 50-60, cyclopentyl isocyanate 20-25, chlorosulfonyl isocyanate 30-40, methacrylic acid 10-14, N, N – Diethylethylamine 20-25, calcium benzoate 10-12, etc. The present invention improves the waterproofing effect of the coating by selecting propylene glycol as the chain extender and with the cooperation of the leveling agent fluorocarbon surfactant FC-4430. The added calcium benzoate, copper quinoline and dimethyloctadecyl [ 3-(Trimethoxysilyl)propyl]ammonium chloride makes the coating anti-bacterial and anti-mildew. By adding carbon black, titanium silicon powder, fumed titanium dioxide, etc., the weather resistance of the coating is increased, making its application range wider. By adding an appropriate amount of acrylate and nano-molybdenum disulfide, the low-temperature flexibility and lubricity of the coating are improved, the solid content of the coating is increased, and the workability of the coating is improved.

CN201610550769. Sodium 1-2, polybenzimidazole 3-4, sucrose acetate isobutyrate 0.2-0.4, rosin 35-40, fumaric acid 8-10, 20-30% sodium hydroxide solution 6-7, ethylene glycol 20-34, antimony trioxide 0.1-0.2, sodium polyacrylate 2-3, zinc chloride 13-20, polyether glycol 80-90, toluene diisocyanate 100-130, 2,2-dimethylol Propionic acid 2-3, diethylene glycol 4-5, triethylamine 1-2, 2-mercaptobenzimidazole 0.2-0.4, hexabromocyclododecane 0.7-1, monobutyltin oxide 1-2, tetrahydrofuran Butylammonium bromide 2-3. The guaiacol, calcium benzoate, sodium diacetate, polybenzimidazole, etc. added in the present invention can effectively improve the anti-corrosion performance of the finished coating.