News Details
The latent epoxy resin coating crosslinking agent
2017-7-31 17:27:45
The latent epoxy resin coating crosslinking agent for the main components is prepared with the tert-ramide superbranched polyester as the main component, and is used in crosslinking of the epoxy resin of bisphenol A.
The crosslinking condition of different crosslinking temperatures was studied by differential scanning calorimeter (DSC), and a reasonable crosslinking process was determined. The tensile strength, bending strength, impact strength, dynamic mechanical properties and the morphology of the sample sections were studied under different crosslinked temperature conditions.
The results show that the materials with low temperature crosslinking have better comprehensive properties. 80 ℃ crosslinking content has the most excellent various performance, including hyperbranched structure type latent epoxy crosslinking agent has some latent, at the same time significantly improve the toughness of epoxy resin crosslinking.
Epoxy resin is a kind of widely used thermosetting resin, excellent mechanical properties can, good resistance to chemical corrosion, resin crosslinking content non-toxic, good adhesion between glass fiber, processing is convenient, is the largest amount of advanced composite matrix. In order to obtain the excellent mechanical and heat-resistant epoxy crosslinking products, it is often necessary to crosslink at high temperature.
However, the high temperature makes the material produce a large internal stress, which affects the precision of the dimension, which can lead to premature destruction of materials. At the same time, high temperature crosslinking can result in narrow range of materials, such as core dies and moulds, etc., and the manufacturing process is complex and energy-consuming, which is not conducive to the cost reduction.
Therefore, it is an important development direction to develop low temperature crosslinking epoxy resin system. At the same time, due to the brittleness of epoxy resin, the application range is restricted, so the toughening modification of epoxy resin has attracted a lot of attention. There are many kinds of toughening modifiers for epoxy resin, such as elastomer, thermoplastic, reactive liquid rubber or nuclear shell particles.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
The crosslinking condition of different crosslinking temperatures was studied by differential scanning calorimeter (DSC), and a reasonable crosslinking process was determined. The tensile strength, bending strength, impact strength, dynamic mechanical properties and the morphology of the sample sections were studied under different crosslinked temperature conditions.
The results show that the materials with low temperature crosslinking have better comprehensive properties. 80 ℃ crosslinking content has the most excellent various performance, including hyperbranched structure type latent epoxy crosslinking agent has some latent, at the same time significantly improve the toughness of epoxy resin crosslinking.
Epoxy resin is a kind of widely used thermosetting resin, excellent mechanical properties can, good resistance to chemical corrosion, resin crosslinking content non-toxic, good adhesion between glass fiber, processing is convenient, is the largest amount of advanced composite matrix. In order to obtain the excellent mechanical and heat-resistant epoxy crosslinking products, it is often necessary to crosslink at high temperature.
However, the high temperature makes the material produce a large internal stress, which affects the precision of the dimension, which can lead to premature destruction of materials. At the same time, high temperature crosslinking can result in narrow range of materials, such as core dies and moulds, etc., and the manufacturing process is complex and energy-consuming, which is not conducive to the cost reduction.
Therefore, it is an important development direction to develop low temperature crosslinking epoxy resin system. At the same time, due to the brittleness of epoxy resin, the application range is restricted, so the toughening modification of epoxy resin has attracted a lot of attention. There are many kinds of toughening modifiers for epoxy resin, such as elastomer, thermoplastic, reactive liquid rubber or nuclear shell particles.
Chinese name: Diethyl toluene diamine(DETDA)Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
Adding these toughening agents will increase the viscosity and internal stress of the system while reducing the thermal properties of the material. Hyperbranched polymer (HBPs) has the properties of low entanglement, high reactivity, high solubility and low viscosity properties. The toughening of epoxy resin is widely concerned.
Boogh et al. proved that the toughening mechanism of superbranched polymer in epoxy resin was the phase separation mechanism, because the hydroxyl hyperbranched polyester did not participate in crosslinking reaction. Other researchers have shown that the toughening mechanism is the plasticity of HBPs, because the end of the hyperbranched polymer is involved in the crosslinking reaction, forming a chemical bond with the network structure of the crosslinked polymer. The purpose of this paper is to discuss the preparation and process of low temperature crosslinking ductile epoxy resin system.
Experimental raw material epoxy resin: CYD2128, epoxy-equivalent 184 ~ 194g/mol; Hyperbranched polyester (HBP) : 48 tertiary amine ends, molar mass of 13000g/mol; Imidazole; 4, 4 '-diaminodiphenyl sulfone (DDS) : analytical pure.
The preparation of latent crosslinking agent. HBP imidazole and epoxy resin adduct mixed in mass ratio 1:1, formed in 120 ℃ melting solid solution, the solid solution dissolved in dimethyl formamide (DMF) in the form of 50% solution, get the latent crosslinking agent (LCA) 113 DSC test using NETZSCH STA409PCDSC study crosslinking process of epoxy resin, epoxy resin type CYD2128 and latent crosslinking agent LCA quality than 10:1 according to the proportion of mixing and vacuum deaeration, weigh and 15 mg in DSC test.
Non-isothermal DSC test temperature to room temperature to 300 ℃, the heating rate of 5 ℃ / min, the isothermal DSC test temperature of 60, 80, 100 and 80 ℃ respectively. Preparation and performance testing of crosslinked samples. CYD2128 epoxy resins and crosslinking agent according to certain proportion mixing and vacuum deaeration, then join the preheated silicon rubber mold, under the condition of different crosslinking of crosslinking, get a test standard spline.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Adding these toughening agents will increase the viscosity and internal stress of the system while reducing the thermal properties of the material. Hyperbranched polymer (HBPs) has the properties of low entanglement, high reactivity, high solubility and low viscosity properties. The toughening of epoxy resin is widely concerned.
Boogh et al. proved that the toughening mechanism of superbranched polymer in epoxy resin was the phase separation mechanism, because the hydroxyl hyperbranched polyester did not participate in crosslinking reaction. Other researchers have shown that the toughening mechanism is the plasticity of HBPs, because the end of the hyperbranched polymer is involved in the crosslinking reaction, forming a chemical bond with the network structure of the crosslinked polymer. The purpose of this paper is to discuss the preparation and process of low temperature crosslinking ductile epoxy resin system.
Experimental raw material epoxy resin: CYD2128, epoxy-equivalent 184 ~ 194g/mol; Hyperbranched polyester (HBP) : 48 tertiary amine ends, molar mass of 13000g/mol; Imidazole; 4, 4 '-diaminodiphenyl sulfone (DDS) : analytical pure.
The preparation of latent crosslinking agent. HBP imidazole and epoxy resin adduct mixed in mass ratio 1:1, formed in 120 ℃ melting solid solution, the solid solution dissolved in dimethyl formamide (DMF) in the form of 50% solution, get the latent crosslinking agent (LCA) 113 DSC test using NETZSCH STA409PCDSC study crosslinking process of epoxy resin, epoxy resin type CYD2128 and latent crosslinking agent LCA quality than 10:1 according to the proportion of mixing and vacuum deaeration, weigh and 15 mg in DSC test.
Non-isothermal DSC test temperature to room temperature to 300 ℃, the heating rate of 5 ℃ / min, the isothermal DSC test temperature of 60, 80, 100 and 80 ℃ respectively. Preparation and performance testing of crosslinked samples. CYD2128 epoxy resins and crosslinking agent according to certain proportion mixing and vacuum deaeration, then join the preheated silicon rubber mold, under the condition of different crosslinking of crosslinking, get a test standard spline.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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