5 results about "Tetrabromobisphenol A" patented technology

The present application relates to the technical field of automatic control of chemical separation equipment, and particularly relates to an automatic control method for a high-cycle batch four-bromine bisphenol A centrifugal separation process. Data in a feed pipe is collected, corresponding control signals are output until filter cake load feedback data reaches a set threshold value; feed parameters are collected, a dynamic dewatering control algorithm is used to control mother liquor turbidity to be lower than a set threshold value; material liquid temperature and mother liquor turbidity data are collected, two control signals are formed by an intelligent spraying control algorithm, and are output to two gradient spraying pumps; a constant maximum speed control signal is output to a centrifuge main motor driver, filter cake humidity feedback is collected, and when humidity feedback data reaches a set drying target value, a discharge instruction is output and the control process is completed. The present application collects multi-dimensional data of material state and separation effect in real time through an online sensor network, and achieves the technical effect that even if feed conditions fluctuate, the excellent stability of batch product quality can be ensured.

This application relates to a high-melting-point, high-whiteness methyl octabromoether flame retardant composition and its preparation method, belonging to the fields of fine chemicals and flame retardant preparation technology. The method includes: etherifying tetrabromobisphenol A, sodium hydroxide, and allyl chloride; purifying the mixture by isothermal crystallization at 30–50°C to obtain a tetrabromoether intermediate; dissolving the intermediate in dichloromethane and reacting it with bromine at 10–40°C; and finally, obtaining the finished product through post-treatment. This invention effectively removes impurities such as monoethers through a specific intermediate crystallization process, and avoids overheating and oxidation side reactions by combining low-temperature bromination and optimized solvent ratios. The obtained flame retardant has a melting point ≥106°C, whiteness R457 ≥92, and bromine content ≥67%, exhibiting advantages such as good thermal stability, low volatility, and high purity. The process conditions are mild and suitable for industrial production.

The application belongs to the technical field of flame retardants, and particularly relates to a surface modified bromide flame retardant and a preparation method thereof. The surface modified bromide flame retardant is prepared by using tetrabromobisphenol A glycidyl ether and 2,7-dihydroxynaphthalene as raw materials, and reacting under the action of a catalyst benzyltriphenylphosphonium bromide to obtain a high molecular weight brominated epoxy resin flame retardant. Then, the high molecular weight brominated epoxy resin flame retardant is modified and grafted by using cyclotriphosphazene modifier to obtain a surface modified high molecular weight brominated epoxy resin flame retardant. The high molecular weight brominated epoxy resin flame retardant is synthesized by using tetrabromobisphenol A glycidyl ether and 2,7-dihydroxynaphthalene, the naphthalene group introduced can greatly improve the thermal stability of the flame retardant, meanwhile, the high molecular weight brominated epoxy resin flame retardant is surface grafted and modified by using cyclotriphosphazene modifier, the cyclotriphosphazene with high efficient charring capacity is introduced, and the carbon layer produced in the process of playing the flame retardant role can improve the smoke problem of the brominated epoxy resin flame retardant.

The application provides a high-heat-resistant flame-retardant polyurethane resin and a preparation method thereof. The resin comprises a flame-retardant polymer, wherein the flame-retardant polymer is copolymerized from a tetrabromobisphenol A diallyl ether (TBPA) monomer and a 2-vinyl-4,6-diamino-1,3,5-triazine (VDT) monomer, and the resin further comprises isocyanate, a polythiol compound and the like. The polyurethane resin material of the application not only has the flame-retardant property, and the limiting oxygen index (LOI) value can reach 32, but also improves the glass transition temperature of the resin.

A method for removing bromine from copper powder resource recycling products and a method for manufacturing regenerated copper, wherein the method for removing bromine from copper powder resource recycling products comprises the following steps: obtaining a copper powder resource recycling product comprising brominated flame retardants; performing a thermal cracking process on the copper powder resource recycling product at a process temperature and a process time, so that the copper powder resource recycling product is heated to generate exhaust gas generated from the brominated flame retardants; and performing a chemical reaction between a mixed catalyst and the exhaust gas, wherein the mixed catalyst comprises an iron-containing catalyst and a calcium-containing catalyst. In this way, hydrogen bromide and tetrabromobisphenol A can be removed simultaneously.