Maleates are esters of maleic acid. Maleic acid reacts with various alcohols to form related maleates. Common maleates include Diethyl Maleate, Dimethyl Maleate etc. People use them as comonomers and copolymers in paints, coatings, adhesives. In addition, maleates are important internal plasticizers. We also used them as intermediates in organic synthesis, such as addition reaction with butadiene and other dienes.
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Diethyl Maleate is a colorless, oily liquid that is slightly soluble in water but easily soluble in ethanol and ether. With a boiling point of 223°C and a flash point of 93°C, this versatile maleate ester is widely used across various chemical industries. Its refractive index is 1.4383 (at 25°C),
Dimethyl maleate is an ester of maleate, a colorless and transparent oily liquid with a relative density of 1.1462. Easily soluble in ethanol, ether and other organic solvents. Used as reactive plasticizer. It can also be copolymerized or cross-linked with acrylate or vinyl acetate.
People use them as comonomers and copolymers of vinyl acetate, styrene, vinyl chloride, acrylic esters, etc. in paints, coatings, adhesives and fiber treatment agents.
Maleate is an important type of internal plasticizer;
Maleates are also used as intermediate in organic synthesis, such as addition reaction with butadiene, cyclopentadiene and other dienes.
Weifang Integratechem Co., Ltd. is a leading, experienced and professional supplier of maleates. Now we manufacture and supply a series of maleates esters, mainly used as plasticizers, adhesives, organic Synthetic intermediates, etc. We are continuously committed to providing customers with competitive prices and consistent service to meet their needs.
According to the chemical structure. Can be divided into: (1) Phthalate esters; (2) Aliphatic dibasic acid esters; (3) Phosphate esters (4) Epoxy compounds; (5) Polymeric plasticizers; ( 6) Benzene polyester; (7) Chlorine-containing plasticizer; (8) Alkyl sulfonate ester; (9) Polyol ester; (10) Other plasticizers.
Maleates are produced by the esterification reaction of maleic acid and the corresponding alcohols, such as dimethyl maleate, diethyl maleate, dibutyl maleate, etc.
Use a catalyst that has good catalytic activity and can be removed from the system without neutralization and water washing, or a catalyst that forms a homogeneous phase with the ester at the reaction temperature and precipitates in a solid state after lowering the temperature.
The carboxylic acid and alcohol can be heated in the presence of a small number of catalysts (concentrated sulfuric acid, dry hydrogen chloride, strong acid type ion exchange resin) to form esters. This reaction is called esterification. Esterification is a reversible reaction, and when equilibrium is reached, a certain number of reactants and products are present.
The functional group of maleates is -COO-, which is formed by dehydration of carboxyl group (-COOH) and hydroxyl group (-OH).
Used as comonomers and copolymers of vinyl acetate, styrene, vinyl chloride, acrylic esters, etc. in paints, coatings, adhesives and fiber treatment agents. Maleate is an important type of internal plasticizer; It is also used as an intermediate in organic synthesis, such as addition reaction with butadiene, cyclopentadiene and other dienes.
Since maleic acid is a dicarboxylic acid, if the alcohol involved in the reaction is a monol, then one molecule of maleic acid reacts with two molecules of a monol to produce a molecule of maleates. After the coefficients corresponding to the chemical reaction are multiplied by their respective molecular weights, the ratio between the three products is the ratio of raw material consumption.
The most cost-effective plasticizers are dibutyl phthalate and dioctyl phthalate.
Dimethyl phthalate
The word “ester” can be preceded by the corresponding carboxylic acid and alcohol names. The word “alcohol” can generally be omitted, that is, “some” acid “some” ester. But the ester of polyols, generally put the “acid behind, called” an alcohol an acid ester.”
Heating and adding catalyst can only accelerate the reaction speed, and has no effect on the composition of the balanced material. In order to increase the yield of esters, excessive carboxylic acids and alcohols are often added, or the resulting water is constantly removed from the reaction mixture. If the boiling point of the ester produced is very low, the ester can also be steamed out. In short, the equilibrium is destroyed to improve the yield of ester. For example, the industrial production of ethyl acetate is to use excessive acetic acid, the generated ethyl acetate and water azeotrope (water 8.6%, ethyl acetate 91.4%, constant boiling point 70.45℃) to steam out, so that the balance is destroyed, and then continue to add acetic acid and ethanol, continue to steam ethyl acetate and water, continuous production.
The hydrolysis of esters in alkali solution is also called saponification reaction, which is because the advanced fatty acid salt obtained by alkaline hydrolysis of grease is the reason of soap.
With extensive experience and expertise, Weifang Integratechem Co., Ltd specializes in supplying high-quality, effective maleates. As one of the leading manufacturers and suppliers in China, we are equipped with professional and productive maleates factory. Please feel free to buy.
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