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Methacrylic acid is colorless crystal or transparent liquid with pungent odor. Soluble in hot water, soluble in most organic solvents such as ethanol and ether. Easily polymerized into water-soluble polymers. Combustible, there is a danger of burning in case of high heat and open flame, and it can produce toxic gas when heated.
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Potassium hydroxide is a common inorganic base with a chemical formula of KOH and a molecular weight of 56.1. It is a white powder or flake solid at room temperature.
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Biphenyl is found in coal tar, crude oil and natural gas. The preparation methods of biphenyl include the chemical composition method of making biphenyl through benzene pyrolysis and the separate extraction method of making biphenyl through various coal tar fractions. The mass fraction of biphenyl in coal tar is 0.20%-0.40%, and coal tar extraction method and chemical composition method coexist.
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The octane is the most important quality indicator of the vehicle gasoline.
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Common tetra-group lead, ferrocene, MMT (methylcyclopentadiene trikarbonyl manganese) or CMT is common, because metal deposits can occur in the inside of the launching machine, resulting in a cylinder wear, spark plug ignition Poor problems such as poisoning, oxygen sensors and ternary catalysts, have been prohibited or constrained. The addition of tetra-element and ferrocene added is known as national standards, and the manganese-based anti-explosive agent is strictly constrained (the detection limit is less than 0.018 g / L).
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Phosphorus pentachloride is mainly used as a chlorination reagent for alcohols, carboxylic acids, amides, aldehydes, ketones, enols, and Beckmann rearrangement reagents. It is used as a chlorination agent and catalyst in organic synthesis, and is used in the production of medicines, dyes, and chemical fibers. It is also the raw material for the production of phosphazene chloride and phosphorus oxychloride.
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From the perspective of physics, the methods to eliminate foam mainly include placing baffles or filters, mechanical stirring, static electricity, freezing, heating, steam, radiation, high-speed centrifugation, pressure and decompression, high-frequency vibration, instantaneous discharge and ultrasonic (acoustic) Liquid control), etc., these methods promote the gas permeation rate at both ends of the liquid film and the drainage of the bubble film to varying degrees, so that the stability factor of the foam is smaller than the attenuation factor, and the number of foams is gradually reduced.
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In fact, any kind of antioxidant can not fully meet these conditions. Therefore, in actual application, it is often based on the variety, use and processing method of engineering plastics, using the strengths of various additives and cooperating to produce synergistic effects.
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Aspirational antioxidants should have the following conditions:
①Should have high anti-oxidation ability;
②Good compatibility with resin, no precipitation;
③Good processing function, non-volatile and non-decomposing at the processing temperature of high polymer;
④Good resistance to extraction, insoluble in water and oil;
⑤The color of itself is best to be colorless or light-colored, so as not to pollute the product;
⑥Non-toxic or low-toxic;
⑦Low price.
In fact, any kind of antioxidant can not fully meet these conditions.
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HCFC-141b (monofluorodichloroethane) is a high-purity liquid widely used in cleaning and solvent fields.
Because its damage to the ozone layer is 1/10 of CFC-113, it is designated as an ideal substitute for fully halogenated chlorofluorocarbons.
HCFC-141b is a widely used non-perhalogenated chlorofluorocarbon. Although its destructive effect on the ozone layer has been greatly reduced compared to fully halogenated chlorofluorocarbons, it can still cause damage to the ozone layer that is difficult to recover. As a result, its use is gradually being reduced around the world.
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Zinc Borate is an environmentally friendly non -halogen flame retardant. It has the characteristics of non -toxic, low -water solubility, high heat stability, small particle size, small gravity, and good decentralization. As a high -efficiency flame retardant Rubber, coatings and other fields.
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Oxygen is a simple substance composed of oxygen. The chemical formula O2 has more vivid chemical properties, and most of the elements can react with oxygen.
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For diesel vehicles such as heavy trucks and passenger cars to meet the National IV emission standards, a suitable SCR system must be selected for exhaust gas treatment, and this system must use urea solution to treat nitrogen oxides in the exhaust gas. Therefore, urea solution for vehicles has become an essential product for heavy-duty trucks and passenger cars to meet the National IV emission standards.
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N-butanol is an organic compound of the molecular formula C4H10O, which has a strong flame when the colorless transparent liquid is combined.
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N-Methyldiethanolamine is a chemical substance with the molecular formula C5H13NO2. It contains two hydroxyl groups and one amino group.
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The toluene diisocyanate has 2,4-toluene diisocyanates and 2,6-toluene diisocyanate (TDI).
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Product Quality: Chemical Abstracts Number: 101-14-4
Appearance: Light yellow to white granular crystals (semi-circular) white to light yellow loose crystals, heating is made black. Microfincture.
Content: ≥ 85%
Melting point: 98-102 ° C
Dry loss: ≤0.2%
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Miscible with ether, diethylene glycol, acetone, carbon tetrachloride, benzene, chlorobenzene, kerosene and olive oil. It can react with hydroxyl-containing compounds, water, amines and compounds with active hydrogen atoms to generate carbamate, urea, semicarbazide, etc. Toluene is nitrated with mixed acid to obtain 2,4- and 2,6-dinitrotoluene, and then hydrogenated and reduced in the presence of nickel catalyst to obtain 2,4- and 2,6-diaminotoluene, which is then reacted with light in chlorobenzene solution. produced by gas reaction.
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Acetic acid, also called acetic acid, glacial acetic acid, chemical CH3COOH, is an organic monovic acid, which is the main component of vinegar.
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Sodium Persulfate is also called sodium sulfate, is an inorganic substance, a chemical formula is Na2S2O8, and the appearance is a white crystal powder, odorless.
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Sodium peroxide is an inorganic substance with a chemical formula of Na2O2 and a molecular weight of 77.98. Beige powder or granules. The relative density is 2.8.
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Can gradually decompose, moist and high temperatures can accelerate decomposition. Can be decomposed by ethanol and silver ion.White crystalline powder.
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Appearance and traits: white crystals, extremely salty, non -toxic. It is easy to solverate in water, ether, glycerin and alkali, slightly soluble in ethanol, but insoluble in water -free ethanol, which is hygroscopic and easy to lump; New potassium salt is generated by reciprocating and disintegrating.
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Good safety factor. Piping reflects that it can prevent the occurrence of explosion caused by partial over-temperature, and it is the safest and most reliable process route for ethylene oxide.
Castor oil is the triglyceride of oleic acid. Castor oil is produced in the seeds of castor oil, and its proportion is 35%~57%." Castor oil is obtained by pressing or solvent extraction. There is basically no color or slightly yellowish color. It is clear and thick liquid; slightly gas; light and then slightly pungent.
Antifoaming agent refers to a substance that can reduce the surface tension of water, solution, suspension, etc., prevent the formation of foam, or reduce or eliminate the original foam. In the papermaking process, due to unreasonable sizing, poorly washed pulp, alkaline fillers used in acid systems, and various additives, foams will accumulate in the wet end of the papermaking system, resulting in the formation of foam dots on the paper.
Tetrabutylammonium bromide is a common product in the chemical industry, also can be called tetrabutylammonium bromide, is a white crystal, deliquant, soluble in water, alcohol, ether and acetone, slightly soluble in benzene.
Firefighters must wear gas masks and full-body fire fighting clothes, and put out the fire in the upwind direction. Spray water to keep the fire container cool until the end of the fire extinguishing.
Hydroxypropyl toluene cellulose is a commonly used building material additive, which is widely used in industry and has a wide variety of types.
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Antioxidant is a kind of plastic additives that can effectively reduce the self-oxidation reaction rate of plastics and promote the degradation of plastics.
Diatom mud is a natural and environmentally friendly interior wall decoration material, which is used to replace wallpaper and latex paint, and plays the role of interior wall decoration and indoor air purification. Powder packaging, not liquid barrels.
The main raw material of diatom mud is the diatom mineral diatomite formed after hundreds of millions of years. Diatom is a kind of algae living in oceans and lakes. Diatom mud is made of natural substances deposited by diatoms, aquatic plankton living in millions of years ago.
According to the data, the domestic xylene market price trend has fallen sharply.The Pengzhou Petrochemical Plant, Urumqi Petrochemical Plant, and Fuhai Chuang Aromatics Plant each run one line. Hengli Petrochemical’s PX plant is overhauled, and other plants are temporarily The operation is stable.