Polyurethane coating hydroxyl crosslinking agent

Polyurethane coating hydroxyl crosslinking agent. Modern anticorrosion coating, especially outdoor steel structure and concrete road surface of the anticorrosion coating, crosslinking and crosslinking type of fluorocarbon aliphatic hydroxyl crosslinking type (- NCO/OH) polyurethane coatings are widely used, and achieved good using effect. In particular, crosslinked crosslinked (two-component solvent) fluorocarbon paint shows excellent protective properties.

Recently, some customers for these two kinds of coatings on the ratio of exactly how much of a difference, and choose what kind of coating on concrete anticorrosive project more appropriate and other issues are still ambiguous. Therefore, this paper attempts to find out the differences between theory, experiment and concrete engineering practice for reference only.

A brief introduction of two coatings. This polyurethane coating is A kind of double packing hydroxy crosslinked coating, containing hydroxyl (OH) - polyester, polyether, alkyd resin, acrylic resin and other resin as part A, for containing isocyanate (NCO) adduct or polymer B component.

The two parts are packed separately and are mixed together in a certain proportion, and they are combined into a membrane by the reaction of (-nco) and (-oh). The polymeric compound, known as polyurethane resin, is called polyurethane resin, because of the repeated link of carbamate in the molecular structure.

Fat group hydroxy crosslinked polyurethane coating has been widely used in outdoor anti-atmospheric aging and chemical resistance. The application is more widely used, especially in fat group hydroxy acrylic coatings.

The coating because of its coating contains a large number of carbamate bond, ester, ether keys, unsaturated fat double bond, biuret, urea formate keys, etc., as a result, the coating has many excellent properties:

(1) the physical mechanical properties are good, the coating is hard, flexible, bright, full, wear-resisting and adhesion strong.

(2) excellent corrosion resistance, coated with oil, acid resistant, chemical and industrial waste gases;

(3) the electric performance is good, suitable for lacquer and other electric insulating paint.




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


(4) it is widely used in the construction of the construction, which can be delivered at room temperature, or by the heating and crosslinking, which will save energy.

(5) and a variety of resin miscibility, available in a wide range adjustment formula, mixture performance, many varieties of coatings products, to meet the use of a variety of general and special requirements.

In short, the polyurethane coating comprehensive performance is good, has been in the wood, the floor, aircraft, automobiles, machinery, electronics, instruments, plastic, fabric, leather, paper, petrochemical industry, light industry, railway vehicles, such as coating obtained in a wide range of applications.

Cross-linking cross-linking fluorine carbon coating system adopts three fluoride vinyl chloride (or tetrachloroethylene), vinyl acid, vinyl ether and vinyl alkane quaternary copolymer (also called FEVE resin) to make the membrane material, using aliphatic HDI biuret as crosslinking agent under the interesting stitch membrane, is a kind of normal temperature cross-linking cross-linking of two-component packaging coatings.

The alternating links between vinyl ether and fluoroolefins determine its high tolerance and high chemical stability; By introducing the alkyl group, the fluorine copolymer can be soluble and have some good mechanical properties such as hardness and flexibility. By introducing the functional group of carboxyl group, it has good compatibility, wettability and adhesion to the appearance of the dressing, substrate and other coatings. By introducing the right amount of hydroxy (in fact is a kind of containing hydroxyl resin), room temperature it can also occur with isocyanate crosslinking reaction, generate the mesh three-dimensional large molecules, and thus made it possible to fluorine carbon coating temperature crosslinking.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

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