Coating process: production process of epoxy resin

Core tips: properties of main raw materials for epoxy resin production: (1) BPA: white flake or granular crystal, insoluble in water, soluble in alcohol, ether, acetone and alkaline solution, slightly soluble in toluene and xylene at room temperature, with sharp increase in solubility at elevated temperature (2) ECH: it is a volatile, colorless and transparent liquid, toxic! It has burn effect on the skin, can seriously stimulate the eyes, has the same irritating smell as chlorine, has anesthetic effect, can dissolve in alcohol, ether and toluene, slightly soluble in water Specific gravity 1.18, boiling point 116.2 ℃ When sampling and testing, take the upper layer Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Home of coatings: properties of main raw materials for epoxy resin production: (1) BPA: white flake or granular crystal, insoluble in water, soluble in alcohol, ether, acetone and alkaline solution, slightly soluble in toluene and xylene at room temperature, and sharply increased solubility at elevated temperature (2) ECH: it is a volatile, colorless and transparent liquid, toxic! It has burn effect on the skin, can seriously stimulate the eyes, has the same irritating smell as chlorine, has anesthetic effect, can dissolve in alcohol, ether and toluene, slightly soluble in water Specific gravity 1.18, boiling point 116.2 ℃ When sampling and testing, take the upper layer (3) Liquid alkali: Lavender liquid, no mechanical impurities, strong alkali, strong corrosion (4) Toluene: colorless flammable liquid with aromatic odor, toxic! Insoluble in water, soluble in alcohol, ether and acetone The specific gravity is 0.866, the boiling point of the pure product is 110.28 ℃, and the lower layer shall be taken for sampling and testing Process flow chart: synthesis: process flow description: the following process is described from the perspective of pilot test, in which the amount of feed used 1 Put bisphenol A into the dissolving kettle, and then through epichlorohydrin, heat the temperature of jacket water vapor to about 70 ℃ 2 After dissolving, use pump to press into the reactor with agitation, start agitation, and drip alkali solution Control the reaction temperature to 50-55 ℃, maintain it for a certain period of time until the end of the reaction, and then reduce the pressure to 94.661kpa at 100 ℃, recover excessive epichlorohydrin for recycling 3 After recovery, benzene is added again for dissolution, and alkali solution is added again at 65 ~ value = "700" numberType = "1" negative = "false" hasspace = "false" > 70 ℃ After reaction, jacket water is used for cooling, standing, and benzene solution is pumped into reflux dehydration kettle Salt foot of lower layer can be extracted once or twice with benzene, and then discharged 4 Reflux in the reflux dehydration kettle until the evaporated benzene is clear Then, it is cooled and placed in a static state It is sent to the storage tank through the filter After settling, it is pumped to the debenzylation kettle to remove benzene First, the pressure is reduced to 140-143 ℃ without distillate from the atmospheric pressure without liquid temperature above 110 ℃, and then the finished product is discharged Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,