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Modified aromatic amine epoxy resin room temperature coating crosslinking agent
2017-7-15 12:11:35
Modified aromatic amine epoxy resin room temperature coating crosslinking agent
Modified aromatic amine epoxy resin room temperature coating crosslinking agent by formaldehyde and aniline condensation generated by polycondensation of polyamines can get good cross-linking performance. The effects of the ratio of amine aldehydes in the crosslinker at room temperature on the modified aromatic amine epoxy resin and the effect of the catalyst on the condensate were studied emphatically.
Epoxy resin is a very widely used thermosetting resin, its application and performance depends largely on the performance of cross-linking agent. In the cross-linking agent, the performance of the aromatic amine crosslinking agent is superior to the aliphatic amine crosslinking agent, but it must be cross-linked at high temperature to obtain excellent performance, which makes it very limited in application, people have been looking for a Crosslinking agent capable of crosslinking at room temperature and having aromatic amine properties.
It is well known that many linear synthetic resin oligomers such as phenolic resins, polyamide resins, polysulfide rubbers and the like can be used as epoxy resin crosslinking agents, but still require heating or prolonged crosslinking to impart excellent properties. Aniline aldehydes The resin has an aromatic amine structure, so it has the properties of aromatic amines.
This paper focuses on the basic properties and applications of the factors that affect the polycondensation of aniline and aldehydes and the crosslinking agent, and obtain the industrial production process formula and technical parameters.
The raw materials used in the experiments were industrial. Aniline, 99% (Nanjing Chemical Factory), accelerator-9 (homemade), formaldehyde, 36% to 37% (Suzhou Fine Chemicals Group), other DMMP, diethylene glycol methyl ether, Esters are imported.
Synthesis of Aniline - aldehyde Condensate. Aniline and formaldehyde in the acid catalyzed polycondensation to produce linear polycondensation polyamine, the specific operation: the aniline and catalyst into the reaction vessel, in the strict control temperature (90 ± 5) ℃ dropping formaldehyde. After completion of the reaction, the reaction was continued for 2 hours, and the reaction was completed. Aniline-formaldehyde polycondensate was prepared.
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
Modified aromatic amine epoxy resin room temperature coating crosslinking agent by formaldehyde and aniline condensation generated by polycondensation of polyamines can get good cross-linking performance. The effects of the ratio of amine aldehydes in the crosslinker at room temperature on the modified aromatic amine epoxy resin and the effect of the catalyst on the condensate were studied emphatically.
Epoxy resin is a very widely used thermosetting resin, its application and performance depends largely on the performance of cross-linking agent. In the cross-linking agent, the performance of the aromatic amine crosslinking agent is superior to the aliphatic amine crosslinking agent, but it must be cross-linked at high temperature to obtain excellent performance, which makes it very limited in application, people have been looking for a Crosslinking agent capable of crosslinking at room temperature and having aromatic amine properties.
It is well known that many linear synthetic resin oligomers such as phenolic resins, polyamide resins, polysulfide rubbers and the like can be used as epoxy resin crosslinking agents, but still require heating or prolonged crosslinking to impart excellent properties. Aniline aldehydes The resin has an aromatic amine structure, so it has the properties of aromatic amines.
This paper focuses on the basic properties and applications of the factors that affect the polycondensation of aniline and aldehydes and the crosslinking agent, and obtain the industrial production process formula and technical parameters.
The raw materials used in the experiments were industrial. Aniline, 99% (Nanjing Chemical Factory), accelerator-9 (homemade), formaldehyde, 36% to 37% (Suzhou Fine Chemicals Group), other DMMP, diethylene glycol methyl ether, Esters are imported.
Synthesis of Aniline - aldehyde Condensate. Aniline and formaldehyde in the acid catalyzed polycondensation to produce linear polycondensation polyamine, the specific operation: the aniline and catalyst into the reaction vessel, in the strict control temperature (90 ± 5) ℃ dropping formaldehyde. After completion of the reaction, the reaction was continued for 2 hours, and the reaction was completed. Aniline-formaldehyde polycondensate was prepared.
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
Catalyst selection. In the synthesis of aniline - formaldehyde polycondensate with an acidic catalyst. Acidic catalyst can be used inorganic acid or organic acid, under the same conditions, the two products of the acid viscosity is not the same, indicating that the two acid catalyst derived polyamine molecular mass distribution is not the same.
Inorganic acid is usually used hydrochloric acid, the disadvantage is low acid content, water content, reaction time is long, need to neutralize, washed. Organic acids avoid these shortcomings. We use self-made catalyst for the promotion of -9. The ratio of aniline to formaldehyde. With the amount of aniline and formaldehyde, the media pH, the type of catalyst is different, the condensate is very different. Reported in the literature (as shown in Table 1), by adjusting the amount of aldehyde and aniline material can be oily liquid, viscous liquid, semi-solid, solid polycondensate.
Different melting point of the polycondensation of its cross-linked product performance is different, high melting point cross-linked heat resistance, good toughness.
In order to obtain a liquid polyamine, the effect of the amount of matter on viscosity is investigated. The reaction conditions were 8% of the catalyst, the reaction temperature was 80 ℃, and the reaction time was 3 h.
The reaction conditions were n (aniline): n (formaldehyde) = 1: 015, the reaction temperature was 80 ℃, and the reaction time was 3 h.
The optimum conditions for the synthesis of aniline - formaldehyde were 1: 015, the amount of catalyst was 8%, the reaction temperature was 80 ℃, and the reaction time was 3 h. The resulting condensate had a viscosity of 910 to 1410 Pa? S. 4 cross-linking agent preparation and cross-linking properties 411 cross-linking agent in the above-mentioned polyamine added by adding the appropriate amount of thinner, heated, fully mixed, the viscosity control in the (110 ± 012) Pa? S, amine value of 13 to 15.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Catalyst selection. In the synthesis of aniline - formaldehyde polycondensate with an acidic catalyst. Acidic catalyst can be used inorganic acid or organic acid, under the same conditions, the two products of the acid viscosity is not the same, indicating that the two acid catalyst derived polyamine molecular mass distribution is not the same.
Inorganic acid is usually used hydrochloric acid, the disadvantage is low acid content, water content, reaction time is long, need to neutralize, washed. Organic acids avoid these shortcomings. We use self-made catalyst for the promotion of -9. The ratio of aniline to formaldehyde. With the amount of aniline and formaldehyde, the media pH, the type of catalyst is different, the condensate is very different. Reported in the literature (as shown in Table 1), by adjusting the amount of aldehyde and aniline material can be oily liquid, viscous liquid, semi-solid, solid polycondensate.
Different melting point of the polycondensation of its cross-linked product performance is different, high melting point cross-linked heat resistance, good toughness.
In order to obtain a liquid polyamine, the effect of the amount of matter on viscosity is investigated. The reaction conditions were 8% of the catalyst, the reaction temperature was 80 ℃, and the reaction time was 3 h.
The reaction conditions were n (aniline): n (formaldehyde) = 1: 015, the reaction temperature was 80 ℃, and the reaction time was 3 h.
The optimum conditions for the synthesis of aniline - formaldehyde were 1: 015, the amount of catalyst was 8%, the reaction temperature was 80 ℃, and the reaction time was 3 h. The resulting condensate had a viscosity of 910 to 1410 Pa? S. 4 cross-linking agent preparation and cross-linking properties 411 cross-linking agent in the above-mentioned polyamine added by adding the appropriate amount of thinner, heated, fully mixed, the viscosity control in the (110 ± 012) Pa? S, amine value of 13 to 15.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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