Maleic aniline coating crosslinking agent

Maleic aniline coating crosslinking agent

Sulfhydryl group as an alternative crosslinking group has the following advantages: the crosslinked site determines that the crosslinking reaction is reversible, and the order crosslinking reaction can be achieved.

Maleic imide can develop a stable mercaptoether bond with sulfhydryl in the condition of pH6.5 to 7.5. In neutral pH conditions, maleic and sulfhydryl reactions are more than 1000 times faster than amino groups. But when the pH is greater than 8.5, the reaction is more amino.

Maleic acid does not react with tyrosine, histidine and methionine. Maleic acid is also hydrolyzed in solution, especially if the pH is greater than 8.0. The hydrolysis reaction can compete with the mercap-group reaction.

The presence of the free sulfhydryl group should be avoided in the reaction solution. In the same way, the sulfhydryl compound can also be used for the termination of the maleimide crosslinking reaction. Adding EDTA to the response buffer system prevents the oxidation of the sulfhydryl group.

Maleic acid, which is caused by the reaction of pyrrole and potassium dichromate. 1177 g potassium dichromate sulfuric acid dissolved in 1200 ml and 712 ml water, heating and 35 ℃, 54 g pyrrole in, mix slowly reaction temperature does not exceed 50 ℃. Never put off till tomorrow what you can, in the 40-50 ℃ thermal reaction to pyrrole smell. To cool, use the glass wool to react to the small amount of tar that is generated, and the slag is washed in hot water. After the extraction of ethyl ether, the extracted liquid is dried by sodium sulphate, which evaporates and recycles the ethyl ether. 7g pure white crystal finished product with vacuum.

Colorless needle crystal or a thin, hazel finish, which is sweet. The melting point of 93.

It's got to be done by a pyrrolium and potassium dichromate. 1177 g potassium dichromate sulfuric acid dissolved in 1200 ml and 712 ml water, heating and 35 ℃, 54 g pyrrole in, mix slowly reaction temperature does not exceed 50 ℃. Never put off till tomorrow what you can, in the 40-50 ℃ thermal reaction to pyrrole smell.

To cool, use the glass wool to react to the small amount of tar that is generated, and the slag is washed in hot water. After the extraction of ethyl ether, the extracted liquid is dried by sodium sulphate, which evaporates and recycles the ethyl ether. 7g pure white crystal finished product with vacuum.

Nitrocellulose lacquer is the volatile coating, the composition of lacquer is volatilize and non-volatile part. The solvent is the volatile component. The non-volatile component is nitrocellulose, resin and plasticizer.

Nitrocellulose lacquer is a kind of costly coating, commonly used in the coating of furniture. Its main performance is:




Chinese name: Diethyl toluene diamine(DETDA)

Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.

Density 1.022

Viscosity (20 ℃) ??mPa·ss290±10

Pour Point ℃-9

Boiling point of310°C

Flash Point°C161.1°C


Tensile strength: the paint film of nitrocellulose lacquer is hard, wear-resisting and sufficient mechanical strength after drying.

Permeability: the addition of resin and toughening agent can be used to make all kinds of performances, but too much toughening agent can reduce the permeability of coating.

Endurance performance: resizing performance by non-alcoholic acid resin, acrylic resin, etc.

Thermal stability: adding synthetic resins and toughening agents will improve thermal stability.

Light resistance: increased resistance to light performance by increasing light resistance and good performance.

Water resistant and acid alkali resistance: paint film with nitrocellulose lacquer can withstand water, weak acid, mineral oil, gasoline and alcohol, but not alkali.

In coating industry, if nitrocellulose lacquer is made separately, lacquer film is high hardness, but adhesion poor, flexibility is insufficient, must add resin, toughening agent, pigment to compensate for its defect. Some resins also improve its quality.

Nitrocellulose lacquer is based on the nitrocellulose, and the combination of synthetic resin, toughening agent, solvents and thinner is a kind of substrate (varnish), and then add the paint to grind, mix, and filter.

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Diethyl toluene diamine(DETDA)  http://www.yaruichem.com