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Classification of polyurethane catalysts
The catalysts commonly used in the synthesis of polyurethane and its raw materials mainly include tertiary amine catalysts and organometallic compounds. There are many varieties of tertiary amines and organometallic compounds. Considering various factors, only more than 20 are most commonly used in polyurethane production.
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Physical and chemical properties of amides
Except for formamide, which is liquid, other amides are mostly colorless crystals, and monoalkyl-substituted amides are often liquid. Due to the strong intermolecular hydrogen bonding ability of amide molecules and the large polarity of amide molecules, its melting and boiling point is even higher than that of carboxylic acids with similar molecular weights. When the hydrogen atom on the amino group is replaced by a hydrocarbyl group, its melting and boiling point is also reduced due to the reduction of the intermolecular hydrogen bond association.
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Physiological role of polyamines
1. Promote growth, improve seed vigor and germination ability; 2. Stimulate the production of adventitious roots and promote the absorption of inorganic ions by the root system; 3. Inhibit the increase of protease and RNase activity, delay leaf senescence, and delay the decomposition of chlorophyll; 4. Regulate the growth and morphogenesis related to phytochrome, and regulate the flowering process; 5. Improve stress resistance and osmotic stress resistance.
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Amine ether production method and use
Production methods There are many synthetic methods, mainly: (1) sodium dimethylamino ethoxide and SO3 or chlorosulfonic acid reaction; (2) trimethylamine reacts with dichloroethyl ether or dimethylamino ethoxyethyl ether; (3) Dimethylamine and ethylene acetal were synthesized in the next step of solid catalyst. Mainly used as catalyst for polyurethane foam.
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Physicochemical properties of amine oxides
Water solubility: due to the polar bond N → 0 in the amine oxide molecule, the dipole moment is 4138D, so the compound has the characteristics of high polarity and high melting point, and is easily soluble in polar solvents such as water and low-carbon alcohols , while insoluble in non-polar solvents such as mineral oil and benzene. In aqueous solution, amine oxides exist in the form of hydrate (R1R2R3NO · XH2O) in large quantities, but with the change of pH value, the polarity will change.
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Introduction of Fatty Acid Chloride
Fatty acid chloride Derivatives in which the hydroxyl group on the carboxyl group of fatty acid is replaced by chlorine. It is prepared by the reaction of fatty acid and phosphorus trichloride. As an acylating agent, it is used to prepare surfactants in which hydrophobic groups are connected with carboxyl groups through intermediate bonds.
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Basic properties of tertiary amines
Carbon dioxide capture is one of the important ways to achieve carbon reduction. CO2 capture technology mainly includes physical absorption method, membrane separation method, chemical absorption method, etc. Among them, chemical solvent absorption method is the oldest and more mature and widely used decarbonization method.
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Characteristics of Secondary Amines
In case of acid, it forms a basin. It is obtained by deamination and hydrogenation of primary amines under the action of nickel drill or copper pot catalyst. Used in herbicides, stabilizers of dioxane, waterproof, antistatic and soft fibers of fibers. Often sold as the hydrochloride salt.
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CONTACT US
Tel : +86-18678786761
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E-mail : export@keruichemical.com
Add : 1711#, Building 6, Lingyu, Guihe Jinjie, Luneng Lingxiu City, Shizhong District, Jinan City, China
Export director information : Mr. Frank Zhang
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