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The acid anhydride type coating crosslinking agent
2017-7-5 23:34:39
The acid anhydride type coating crosslinking agent
Anhydride type crosslinking agent: maleic anhydride (MA)
Relative molecular mass 98, white crystal, relative density 1.509, 53 ℃ melting point, boiling point 202 ℃, with sublimation, stimulate an eye. The dosage of maleic anhydride is usually 30% ~ 40% of resin quality. Crosslinking conditions (160 ~ 200 ℃)/(2 ~ 4 h). The mixture will be used for a long time and can be placed at room temperature for 2 ~ 3d. Due to separate use of MA EP crosslinking on hard and brittle, so often told MA and toughening agent (such as polyol) and other anhydride (such as phthalic anhydride, all four methyl benzene anhydride and benzene ketone tetracarboxylic acid dianhydride, etc.) are used together.
When used with polyol, the kinds and dosage of polyol on crosslinking of a large impact on heat resistance: the greater the relative molecular weight polyols, the less functional groups, the dosage, the more will result in crosslinked heat resistance reduced. MA, which has an unsaturated double bond, can be used as a crosslinking agent for epoxy polybutadiene resin, which can improve the heat resistance of the crosslinking.
Acid anhydride type crosslinking agent: tung oil anhydride (TOA)
TOA is a liquid cross-linking agent consisting of three acid anhydride based on the reaction of maleic anhydride and tung oil, and the viscosity is 5000 ~ 6000cps at room temperature. It is very low in volatility and can be soluble in epoxy resin without heating or heating. The toa-ep system with the promoter has a long service life.
Anhydride type crosslinking agent: oleic acid anhydride
Also called alkenyl succinic anhydride can be prepared by the reaction of maleic anhydride and monolefin.
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
Compared with MA, C8 ~ C9 oleic acid anhydride has low volatility and longer application period. The same C8 base replaces butanedioic anhydride, bending properties: branched-chain olefins > straight-chain olefins > direct paraffin.
Dodecyl succinic anhydride (DDSA), molecular weight C16H26O3, relative molecular weight 286. Yellow liquid, tonal (G) 5, not water.
Tetrahydrophthalic anhydride (THPA) and methyl tetrahydrophthalic anhydride (MeTHPA) : these two kinds of anhydride are prepared by the double bond of butadiene and isoprene and MA by double bond. Two kinds of anhydride were white crystal, melting point 102 and 63 ℃ respectively. They are soluble in ethanol, acetone, aromatic hydrocarbons, etc., and have no good solubility to gasoline. Without sublimation, the vapor pressure at room temperature is low, with low volatility and longer application period.
Six hydrogen phthalic anhydride (HHPA) : the relative molecular mass is 154, colorless glass powder, melting point 35 ~ 36 ℃, soluble in benzene, toluene, acetone, carbon tetrachloride, chloroform, etc. The low melting point of the crosslinking agent, in 50 ~ 60 ℃ low temperature easily mixed with epoxy resin, the viscosity of the mixture is very low, long period, when the crosslinking heat quantity is small, but in a short time can finish crosslinking. The heat resistance of crosslinking material is better.
Six methyl hydrogen phthalic anhydride (MeHHPA) : 4 - methyl hydrogen six phthalic anhydride is colorless transparent or of low viscosity liquid such as water, less than amine toxicity of crosslinking agent, cooperate with epoxy resin after applicable period is longer, transparent and beautiful. Crosslinking time and post crosslinking conditions, crosslinking agent dosage and so on have an influence on the thermal deformation temperature of crosslinking. Crosslinking is good and is commonly used in optics.
Nadeic anhydride (NA) : cis - 3, 6 - nea-1, 2, 3, 6-tetrahydrophthalic anhydride, produced by maleic anhydride and cyclopentadiene. The thermal stability of the NA crosslink is superior to phthalic anhydride, MA, and THPA. The different dosage of NA has a great influence on the heat resistance of crosslinking materials, and the ratio of the amount of acid anhydride to epoxy resin is 0.9:1.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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