News Details
Phenolic modified amine coating crosslinking agent
2017-8-9 23:48:21
Phenolic modified amine coating crosslinking agent
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
There are two methods for synthesis of phenolic modified amine coatings.
Phenolic modified amine crosslinking agent (1) one-step method. The modified crosslinking agent was synthesized by using the reaction materials of phenols, amines and aldehydes according to a certain molar ratio.
Phenolic modified amine crosslinking agent (2) two-step method. Phenol and aldehydes are precondensated into low molecular mass resins, and the reaction with amine is the liquid phenol aldehyde modified amine, which is seen in the control of phenol and aldehydes. The lower the quality of the resin molecules is better, or the amino compound can be reacted with the lower amine value and the poor fluidity of the modified amine.
Two can synthesize modified amine process route, but the latter practice is difficult, long production cycle, product quality is not stable, the former is simple, the reaction is easy to control, process stability, short production cycle, only 6-8 h/batch, high utilization rate of equipment, manufacturers are using step hair production at present.
Using phenol phenolic hydroxyl on the aromatic ring adjacent matchup, one of the three active hydrogen position introduce flexible long chain with conjugated double bond, the remaining two active hydrogen position can still mannich reaction, modified products can be obtained, it has to do with epoxy cross-linking, greatly improve the crosslinking material brittleness, significantly increased the flexibility, has higher adhesion.
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
The usual double - bond compounds such as acrylonitrile, acrylate, propylene alcohol, etc. The main modificator is acrylonitrile, which can react with ethylene diamine, diamine and ethylene triamine to produce modified products. Typical examples such as acrylonitrile and diethylenetriamine plus reaction are cross-linked. This crosslinking agent has a strong smell and is very toxic. Between benzene dimethylamine by crosslinking agent and acrylonitrile modification, low toxicity, its LD50 = 145 mg/kg. In addition, there are between benzene dimethylamine, acrylonitrile, captive compounds the comprehensive modification of crosslinking performance good crosslinking agent of yellow transparent liquid.
The self - condensation reaction of amines. Typical example for the polycondensation reaction of benzene dimethylamine, between between benzene dimethylamine in the presence of catalyst in the condensation reaction under the 180-200 ℃, the release of NH3 by sulfuric acid absorption, the reaction of 5-10 h filter to remove the catalyst to get product shrinkage, its quality indicators for the appearance of yellow transparent sticky liquid, viscosity 0.5 1 pa. S, amine values (mgKOH/g), 600-800.
Reactions with carbonyl compounds (ketoimide). Common amine such as ethylenediamine, diethylene triamine, ketone such as ketone, acetone, ketone, methyl isobutyl, etc. This reaction is reversible and must be used to remove the generated water with the water absorbent (such as the anhydrous AlCl3) in the reaction process and the reaction is carried out in the direction of the ketone amine. The red and brown viscous fluid obtained by the end reaction. Products must be sealed to prevent water vapor entering.
Latent type, the crosslinking agent belongs to the normal temperature water is broken down into multiple primary amine and the corresponding ketones, multiple primary amine and epoxy crosslinking, thus can be used as a wet sex agent, evaporate and dissociation of ketone, require ketone with good volatile. The coating thickness should not exceed 200 mu m, otherwise, ketoimine is difficult to dissociate, the inner layer crosslinking is not complete, the ketone in the coating is not volatile, and it is wrapped in the outer resin crosslinking, which affects the performance of the crosslinking property.
In addition, ketone imide varieties, phenolic deformation ketone imide has a better performance indicators is a kind of crosslinking agent, first by phenol, formaldehyde, benzene dimethylamine reaction between generated phenolic aldehyde amine, then react with methyl isobutyl ketone generated phenolic modified ketone imide, its equation is:
The modification of polyamide crosslinking agent - polyamide crosslinking agent
The phenolic deformed ketone is not only the characteristic of moist and low temperature crosslinking, but also has the phenolic skeleton structure, which further enhances the moisture resistance and corrosion resistance of the resin crosslinking.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian