4,4'-Oxydianiline

Superiority:

As a special engineering material, polyimide has the advantages of high temperature resistance, radiation resistance and high mechanical strength. It is used in film, coating, fiber, aerospace, electronic and electrical industry, foam plastics and photoresist, etc. 4,4' -diaminodiphenyl ether is one of the main raw materials. At the same time, 4,4' -diaminodiphenyl ether can also be used to produce crosslinking agent, and widely used to replace the carcinogenic benzidine in the production of azo dyes and reactive dyes. Therefore,4,4' -diaminodiphenyl ether is an intermediate with high added value. Properties and stability 4,4' -diaminodiphenyl ethers should be avoided from contact with strong oxidants. Toxic, production equipment should be closed, the production site to maintain good ventilation, to prevent dust flying. Operators should wear protective equipment toxic. 4,4' -diaminodiphenyl ether can cause cancer. Inhalation of vapors or powders or absorption through the skin can cause poisoning. Can damage the person's nervous system, make blood form denaturement hemoglobin, have hemolysis effect. Production equipment should be sealed. The production site should be well ventilated to prevent dust. Operators should wear protective equipment. Chemical properties White or light yellow crystals. Tasteless. It is used as a monomer of polyimide, a polymer material with high temperature resistance. It is also used as a dye intermediate in the plastic industry. It is also used as a spice in the synthesis of resins. Dye intermediate. Resin synthesis. 1. It is one of the important raw materials of high temperature resistant resins of new special engineering plastics, such as polyimide, polyetherimide, polyester imide, polymaleimide and polyaromatic amide; 2. It is also the raw material for the synthesis of 3,3', 4,4' -tetraamino diphenyl ethers, the latter is the main monomer in the preparation of a series of aromatic heterocyclic heat-resistant polymer materials. 3. It is also used as high performance heat resistant epoxy resin, polyurethane and other synthetic polymer raw materials and crosslinking agent. 4. At the same time, it is also used to replace benzidine with carcinogenic effect in the production of azo dyes, reactive dyes and spices and other fields. At present, direct dyes of different color levels, such as bright red, brilliant red, sandy red, yellow brown, green, gray, blue, brilliant orange and black, have been developed with diaminodiphenyl ether as raw materials. They can be used for dyeing silk, wool, cotton and hemp fabrics, and their color fastness and exhausted dyeing rate are superior to benzidine dyes. Production method (1) condensation reaction Then 145kg nitrochlorobenzene, 123.5kg p-nitrophenol, 95.7kg sodium carbonate and 6.18kg potassium chloride were successively added to the stirred reaction kettle. The temperature was heated to 210-215 ℃ under stirring, and the stirring reaction was maintained at this temperature for 24h. After the condensation reaction is completed, the condensate is cooled and pumped to the distillation device. Vacuum distillation is carried out first. When the nitrobenzene is steamed out 350 ~ 400L, it is changed to steam distillation until there is no nitrobenzene in the distillate. Chemicalbook4,4 '-dinitrodiphenyl ether was prepared by absorbing and filtering the residual, and then washing the filtrate with water until it was discolored. (2) Reduction reaction 918kg of butanol was added into the reduction reaction kettle, 10kg of ammonium chloride and 50kg of iron filings were added under agitation, and 4,4 '-dinitrodiphenyl ether was added at 95℃ when the temperature was raised to 95℃, and the stirring reaction was 0.5h. Then add the second batch of iron filings 40kg, 4,4 '-dinitrodiphenyl ether 20kg, stirring reaction 0.5h. Then add the third batch of iron 40kg, 4,4 '-dinitrodiphenyl ether 20kg, still maintain the reaction temperature of 100℃, reaction 1.5h sampling analysis of the reaction endpoint. After the reaction, 12kg of sodium bisulfite was added, stirred and dissolved, and the reaction materials were pumped into the crystallization kettle with tubular filter while hot for cooling crystallization for about 8h. After filtration, filtrate butanol was recycled after distillation, filter cake was washed with water until no butanol, and crude 4,4 '-diaminodiphenyl ether was obtained. (3) Product refinement Add 340kg water and 60kg30% hydrochloric acid into the dissolution tank, stir and add crude 4,4 '-diaminodiphenyl ether, 1.5kg citric acid and 1kg sodium bisulfite, heat to 60℃, and then add 9kg activated carbon. Continue heating to 80℃ for 0.5h. After cooling, filter the filtrate into the neutralization tank, add sodium bisulfite 0.5kg under stirring, and then slowly add ammonia water, keep the temperature below 30℃, neutralization to the pH value of the material is 8 ~ 9, then 4,4 '-diaminodiphenyl ether crystal precipitation from the solution. After filtration, the cake was washed with water until it was neutral and free of chloride ions. After filtration, vacuum drying was carried out. The dried 4,4 '-diaminodiphenyl ether was added to the sublimator, vacuumized to 26.66pa below, heated to 185-190 ℃, 4,4' -diaminodiphenyl ether was vaporized and entered the crystallization chamber, where it was cooled and crystallized. The temperature of the crystallization chamber was controlled at 135-145 ℃. When the crystallization chamber temperature drops significantly, that is, the sublimation end, cool the sublimator, so that the crystallization chamber temperature drops to 50℃ for discharging, then the finished product. The sublimation operation takes about 10 hours per batch. Safety information distinctly marked T, N dangerous category code 45-46-25 - / - 23/24-51/53-62-38-22 - / - 36/37-50/53-43 security 45-61-53-36/37-26-20-60 transport of dangerous goods code UN30779 / PG3WGKGermany3RTE CS BY7900000TSCAYesHazardClass6 no. 1 packinggroupiii customs code 29222900 toxic substance data 101-80-4 (HazardousSubstancesData) toxicity LD50orl - rat: 725 mg/k GHYSAAV33, of 137