News Details
Epoxy resin coating crosslinking accelerator
2017-8-13 19:23:48
Epoxy resin coating crosslinking accelerator
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
The performance of epoxy resin coating varies greatly with epoxy resin crosslinking promoters, mainly in the following aspects:
The mechanical properties of epoxy resin coatings were improved by epoxy resin crosslinking accelerator (1).
The reaction activity of epoxy resin coating is high and the crosslinking density is large, so the coating has good corrosion resistance. But at the same time there is also a lack of physical and mechanical properties, such as poor elasticity, big issues such as brittleness, by introducing a flexible chain segment of crosslinking agent, such as with long chain fatty acid polyamide to be improved.
Epoxy resin crosslinking accelerator (2) improves the process performance of epoxy resin coatings.
The epoxy resin coating is often used on the site of large-scale construction, the toxicity of volatiles and operational problems in wet and low temperature environment. In recent years, a variety of non-toxic or low-toxicity products have been developed at home and abroad, and the modified crosslinking agent, such as modified ketogenic crosslinking agent, has excellent construction, mechanical properties and corrosion resistance.
Epoxy resin crosslinking accelerator (3) improves the corrosion resistance of epoxy coatings.
The corrosion resistance of different epoxy crosslinking systems is also different. The epoxy resin of the crosslinking agent of amines has good alkali resistance and less acid resistance, and the tertiary amine structure formed after crosslinking is easy to react with acid to produce tertiary ammonium salt. However, the acid anhydride crosslinking agent crosslinked epoxy resin is the opposite, the acid is good and the alkali is bad, because the esters formed after crosslinking have an irreversible hydrolytic reaction under alkaline conditions.
Epoxy resin crosslinking accelerator (4) improves the temperature resistance of epoxy coatings.
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
Using aliphatic amine crosslinking agent crosslinked epoxy resin, its thermal deformation temperature is low, usually only about 70 ~ 80 ℃. Use appropriate aromatic kind of crosslinking agent, crosslinking agent, or anhydride can make the thermal deformation temperature up to 150 ℃ or so, but after the two types of crosslinking agent alone the general needs cross-linking under heating conditions.
The dielectric properties of epoxy resin coatings were improved by epoxy resin crosslinking accelerator (5).
When the epoxy resin is used for insulating coating, it can be used to improve the copolymer by using the modified copolymer, which can obviously improve the heat resistance and dielectric properties of the coatings.
Respectively in the self-made elastic crosslinking agent to join different ratio N75 N3390 and crosslinking agent, the tensile strength of the coating obtained with N75 and N3390 content is gradually increasing with the increase of elongation at break along with the augment of N75 and N3390 content gradually reduced.
This is because the N75 and N3390 are three functions of small molecules rigid crosslinking agent, its content is higher, the junction in the coating, the coating between molecular chains in the crosslinking density, the greater the coating the higher tensile strength, elongation at break is lower.
N75 is the diurea structure of HDI, and there is no ring structure in its molecular structure; N3390 is a HDI trimer structure, and its molecular structure contains a six-membered ring structure, so the addition of N3390 of the same amount is better than adding N75, but after adding N3390, its fracture elongation is lower. When the addition of N75 and N3390 is more than 15%, the tensile strength is not obvious, and the elongation of the fracture is very obvious. Therefore, the dosage of rigid crosslinking agent should be 15%.
Alcohol, phenol and carboxylic acid and other hydroxyl compounds and glycidyl ether reacted in the order of alkaline promoters in the order of > phenol > carboxylic acid. This is in line with the basic order of their anions.
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