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Epoxy resin (EP) USES paint crosslinking agent
2017-7-31 17:27:52
Epoxy resin (EP) USES paint crosslinking agent
For pentaerythritol four mercapto propionic acid ester (PTM) synthesis process was studied, discussed the method, reaction temperature and reaction medium, reaction time, kind and amount of water absorption on pentaerythritol hydroxyl methyl esterification rate.
The results showed that the optimum condition for synthesis of PTM is reaction temperature is 115 ℃, reaction medium for toluene, SAP for molecular sieve, w (molecular sieve) = 30% (relative to the total monomer reaction), reaction is in toluene reflux water reoccupy after 2.5 h of soxhlet extraction apparatus is equipped with SAP dehydration 2.5 h; The PTM and a small amount of epoxy resin (EP) are used to make the epoxy resin (EP). The epoxy resin (EP) can be used crosslinking agent to crosslink EP at low temperature.
Epoxy resin (EP) is a kind of important thermosetting resin, has high mechanical properties, electrical properties and heat resistance properties, as a high performance resin matrix of composite materials in machinery, electronics, aerospace and shipbuilding industry in areas such as widely used. Crosslinking agent plays an important role in EP application.
EP crosslinking agent is a wide variety, and the current low temperature crosslinking agent is widely used in fatty polyamine crosslinking agent, which has a high toxicity and is very stimulating to human skin. When this kind of crosslinking agent and EP reaction, the system has high heat, short duration and poor flexibility of crosslinking.
Mercaptan in tertiary amine crosslinked under the action of promoting agent, can be in - 20 ℃ under the condition of rapid crosslinking EP; The polythiol has the advantages of high molecular weight, low odor, moderate viscosity, not excessive flow and easy to use.
Chinese name: Diethyl toluene diamine(DETDA)
For pentaerythritol four mercapto propionic acid ester (PTM) synthesis process was studied, discussed the method, reaction temperature and reaction medium, reaction time, kind and amount of water absorption on pentaerythritol hydroxyl methyl esterification rate.
The results showed that the optimum condition for synthesis of PTM is reaction temperature is 115 ℃, reaction medium for toluene, SAP for molecular sieve, w (molecular sieve) = 30% (relative to the total monomer reaction), reaction is in toluene reflux water reoccupy after 2.5 h of soxhlet extraction apparatus is equipped with SAP dehydration 2.5 h; The PTM and a small amount of epoxy resin (EP) are used to make the epoxy resin (EP). The epoxy resin (EP) can be used crosslinking agent to crosslink EP at low temperature.
Epoxy resin (EP) is a kind of important thermosetting resin, has high mechanical properties, electrical properties and heat resistance properties, as a high performance resin matrix of composite materials in machinery, electronics, aerospace and shipbuilding industry in areas such as widely used. Crosslinking agent plays an important role in EP application.
EP crosslinking agent is a wide variety, and the current low temperature crosslinking agent is widely used in fatty polyamine crosslinking agent, which has a high toxicity and is very stimulating to human skin. When this kind of crosslinking agent and EP reaction, the system has high heat, short duration and poor flexibility of crosslinking.
Mercaptan in tertiary amine crosslinked under the action of promoting agent, can be in - 20 ℃ under the condition of rapid crosslinking EP; The polythiol has the advantages of high molecular weight, low odor, moderate viscosity, not excessive flow and easy to use.
Chinese name: Diethyl toluene diamine(DETDA)Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
At present, thiol crosslinking agent is used for the esterification of thioglyc. The literature reports that [4] pentaerythritol has a high degree of function, and the space resistance effect is obvious in the reaction time, thus hindering the esterification reaction and reducing the hydroxymethyl esterification rate. Therefore, this topic by changing the reaction way, hydroxyl methyl esterification rate are increased obviously, and discusses the reaction way, reaction temperature, reaction time and medium, kind and amount of water absorption of pentaerythritol reaction monomers such as hydroxyl methyl esterification rate.
Test materials: 3-mp propionic acid, analysis pure; Pentaerythritol, chemical purity; Chloroform, toluene, benzene, xylene, ethanolamine, sodium sulphate (Na2SO4), calcium chloride (CaCl2), magnesium sulfate (MgSO4), and the analysis of pure; 2, 4, 6-3 (dimethyl aminomethyl) phenol (DMP - 30), analysis of pure; Molecular sieve, 4 魡 type (aperture 0.4 nm); Benzyl dimethylamine, toluene sulfonic acid, analysis pure; Epoxy resin (EP828), industrial grade.
Test instruments. The TENSOR27 Fourier transform infrared spectrometer, AVANCE / 500M type NMR. The synthesis of pentaerythritol tetrahydryl propionate (PTM). Firstly, PTM [see equation (1)] was generated by the reaction of pentaerythritol and 3-thioglycolic acid at a certain temperature, with w (catalyst) = 1% (relative to toluene sulfonic acid). Then PTM and EP in accordance with the quality of mixing ratio is 3:1, up to 100 ℃ for 1 h reaction, get sticky of six yuan mercaptan after cooling.
The performance test infrared spectrum (ft-ir) was used to perform scanning analysis. Nuclear magnetic resonance hydrogen spectrum (1h-nmr) was analyzed using an mri (solvent is chloroform). Gel time was determined according to GB/T12007.7-1989 standard.
Structure characterization and analysis of PTM. PTM's ft-ir curve, 1h-nmr curve 2570cm-1 is the telescopic vibration peak of -sh (sulfhydryl), and 1750cm-1 is the telescopic vibration peak of C = O (carbonyl), indicating that PTM of the expected structure is successfully synthesized. (3.56 ~ 3.65) x 10-6 (i.e., peak 5) is the methylene resonance peak of pentaerythritol, which can calculate the esterification rate of the hydroxymethyl group according to the peak area of the methylene 1h-nmr before and after esterification.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
At present, thiol crosslinking agent is used for the esterification of thioglyc. The literature reports that [4] pentaerythritol has a high degree of function, and the space resistance effect is obvious in the reaction time, thus hindering the esterification reaction and reducing the hydroxymethyl esterification rate. Therefore, this topic by changing the reaction way, hydroxyl methyl esterification rate are increased obviously, and discusses the reaction way, reaction temperature, reaction time and medium, kind and amount of water absorption of pentaerythritol reaction monomers such as hydroxyl methyl esterification rate.
Test materials: 3-mp propionic acid, analysis pure; Pentaerythritol, chemical purity; Chloroform, toluene, benzene, xylene, ethanolamine, sodium sulphate (Na2SO4), calcium chloride (CaCl2), magnesium sulfate (MgSO4), and the analysis of pure; 2, 4, 6-3 (dimethyl aminomethyl) phenol (DMP - 30), analysis of pure; Molecular sieve, 4 魡 type (aperture 0.4 nm); Benzyl dimethylamine, toluene sulfonic acid, analysis pure; Epoxy resin (EP828), industrial grade.
Test instruments. The TENSOR27 Fourier transform infrared spectrometer, AVANCE / 500M type NMR. The synthesis of pentaerythritol tetrahydryl propionate (PTM). Firstly, PTM [see equation (1)] was generated by the reaction of pentaerythritol and 3-thioglycolic acid at a certain temperature, with w (catalyst) = 1% (relative to toluene sulfonic acid). Then PTM and EP in accordance with the quality of mixing ratio is 3:1, up to 100 ℃ for 1 h reaction, get sticky of six yuan mercaptan after cooling.
The performance test infrared spectrum (ft-ir) was used to perform scanning analysis. Nuclear magnetic resonance hydrogen spectrum (1h-nmr) was analyzed using an mri (solvent is chloroform). Gel time was determined according to GB/T12007.7-1989 standard.
Structure characterization and analysis of PTM. PTM's ft-ir curve, 1h-nmr curve 2570cm-1 is the telescopic vibration peak of -sh (sulfhydryl), and 1750cm-1 is the telescopic vibration peak of C = O (carbonyl), indicating that PTM of the expected structure is successfully synthesized. (3.56 ~ 3.65) x 10-6 (i.e., peak 5) is the methylene resonance peak of pentaerythritol, which can calculate the esterification rate of the hydroxymethyl group according to the peak area of the methylene 1h-nmr before and after esterification.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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