News Details
Mannishi-type epoxy paint crosslinking agent
2017-8-2 11:52:22
Mannishi-type epoxy paint crosslinking agent
Expounds the mannich bases type epoxy crosslinking agent of synthetic principle, synthetic method and the development history and trend of development, and increase the crosslinking agent toughness, heat resistance, to reduce the viscosity of crosslinking agent and the development of underwater crosslinking agent and crosslinking agent production process improvement, etc are discussed in this paper.
Crosslinking agent is an essential reaction agent in the application of epoxy resin, which determines the physical and chemical properties and application fields of crosslinking with epoxy resin. Polyamines and modified amines are the most widely used and the most used.
Early epoxides were used as cross-linking agents in the use of polyamines such as ethylenediamine and ethylene triamine. This kind of crosslinking agent there is toxic, crosslinking ratio of hard, life is short, crosslinking product large brittleness, poor comprehensive mechanical properties, such as faults, easy to absorb water and carbon dioxide from the air to produce bleaching phenomenon, now rarely used directly, modified amine crosslinking agent based amine replaced the crosslinking agent.
Phenols, aldehydes and polyamine compounds by mannich reaction (MannichReaction) of mannich bases (MannichBase) modified amine crosslinking agent, is a liquid at room temperature, high activity and good operability, low temperature or damp environment cross-linked epoxy resin, etc.
In China since the early 1980 s of mannich bases type epoxy resin synthesis of crosslinking agent, to the end of last century, has been a T a 31, 701, 703 and so on a variety of products supply market, become a epoxy adhesive and epoxy composite material of the main types of crosslinking agent.
In the first decade of this century, with the deepening of the synthetic study, a batch of new type mannich bases crosslinking agent, gradually overcame in the old product defects such as poor toughness, short lifespan, range of application to building structural adhesive, epoxy coatings, and more areas.
Mannich reaction is an asymmetric condensation reaction between amines (alkali components), compounds containing active hydrogen (acid components) and aldehydes. Mannichyl-type crosslinking agent is a low molecular liquid polymer synthesized by mannich reaction.
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
Expounds the mannich bases type epoxy crosslinking agent of synthetic principle, synthetic method and the development history and trend of development, and increase the crosslinking agent toughness, heat resistance, to reduce the viscosity of crosslinking agent and the development of underwater crosslinking agent and crosslinking agent production process improvement, etc are discussed in this paper.
Crosslinking agent is an essential reaction agent in the application of epoxy resin, which determines the physical and chemical properties and application fields of crosslinking with epoxy resin. Polyamines and modified amines are the most widely used and the most used.
Early epoxides were used as cross-linking agents in the use of polyamines such as ethylenediamine and ethylene triamine. This kind of crosslinking agent there is toxic, crosslinking ratio of hard, life is short, crosslinking product large brittleness, poor comprehensive mechanical properties, such as faults, easy to absorb water and carbon dioxide from the air to produce bleaching phenomenon, now rarely used directly, modified amine crosslinking agent based amine replaced the crosslinking agent.
Phenols, aldehydes and polyamine compounds by mannich reaction (MannichReaction) of mannich bases (MannichBase) modified amine crosslinking agent, is a liquid at room temperature, high activity and good operability, low temperature or damp environment cross-linked epoxy resin, etc.
In China since the early 1980 s of mannich bases type epoxy resin synthesis of crosslinking agent, to the end of last century, has been a T a 31, 701, 703 and so on a variety of products supply market, become a epoxy adhesive and epoxy composite material of the main types of crosslinking agent.
In the first decade of this century, with the deepening of the synthetic study, a batch of new type mannich bases crosslinking agent, gradually overcame in the old product defects such as poor toughness, short lifespan, range of application to building structural adhesive, epoxy coatings, and more areas.
Mannich reaction is an asymmetric condensation reaction between amines (alkali components), compounds containing active hydrogen (acid components) and aldehydes. Mannichyl-type crosslinking agent is a low molecular liquid polymer synthesized by mannich reaction.
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
The synthesis method of manichyl-type crosslinking agent can be divided into one-step reaction method and two-step reaction method. In recent years, the study, also appeared some new synthetic methods, through the new group side to the three components, to improve the performance of the crosslinking agent, but overall still belongs to the one step method or two step synthesis method.
Step by step synthesis. Domestic research practice, the general step response method is used to synthesis of mannich bases crosslinking agent, namely at room temperature prior to phenol and amine compounds into reactor mixed, then add the aldehyde, heating reaction time, vacuum dehydration for finished products.
The two-step reaction method is synthesized. There is also a two-step reaction method to synthesize, which is only discussed in the case of phenolic reaction producing intermediates, and the process of mannich-based cross-linking agent with amine reaction. The first step was to use phenol and aldehydes to react, and in the presence of catalyst, the liquid phenolic polymer with low polymerization degree was generated, and the mannichyl-type crosslinking agent was prepared with the reaction of amine compounds.
It is also possible to take the reaction of aldehydes and amines to the reaction of aldehydes (schiff base) or to react with the reaction of phenol and amine to form the salt, but not in the synthesis.
In mannichyl-type crosslinking agent, T 1 31 crosslinking agent developed in the early 1980s is representative. T 131 crosslinking agent adopts phenol, formaldehyde aqueous solution and ethylenediamine synthesis, with outstanding characteristics: fast crosslinking speed; Can in 0 ℃ or so crosslinked epoxy resins under the low temperature or damp environment of; Compared with the polyamide crosslinking agent, the toxicity is low, the matching requirement is not strict, and the operation is improved effectively. Good chemical resistance and moisture resistance. But there are also defects: the use period is shorter; Poor toughness, poor comprehensive mechanical properties: salt resistance and corrosive effect: adhesion to coating interface.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
The synthesis method of manichyl-type crosslinking agent can be divided into one-step reaction method and two-step reaction method. In recent years, the study, also appeared some new synthetic methods, through the new group side to the three components, to improve the performance of the crosslinking agent, but overall still belongs to the one step method or two step synthesis method.
Step by step synthesis. Domestic research practice, the general step response method is used to synthesis of mannich bases crosslinking agent, namely at room temperature prior to phenol and amine compounds into reactor mixed, then add the aldehyde, heating reaction time, vacuum dehydration for finished products.
The two-step reaction method is synthesized. There is also a two-step reaction method to synthesize, which is only discussed in the case of phenolic reaction producing intermediates, and the process of mannich-based cross-linking agent with amine reaction. The first step was to use phenol and aldehydes to react, and in the presence of catalyst, the liquid phenolic polymer with low polymerization degree was generated, and the mannichyl-type crosslinking agent was prepared with the reaction of amine compounds.
It is also possible to take the reaction of aldehydes and amines to the reaction of aldehydes (schiff base) or to react with the reaction of phenol and amine to form the salt, but not in the synthesis.
In mannichyl-type crosslinking agent, T 1 31 crosslinking agent developed in the early 1980s is representative. T 131 crosslinking agent adopts phenol, formaldehyde aqueous solution and ethylenediamine synthesis, with outstanding characteristics: fast crosslinking speed; Can in 0 ℃ or so crosslinked epoxy resins under the low temperature or damp environment of; Compared with the polyamide crosslinking agent, the toxicity is low, the matching requirement is not strict, and the operation is improved effectively. Good chemical resistance and moisture resistance. But there are also defects: the use period is shorter; Poor toughness, poor comprehensive mechanical properties: salt resistance and corrosive effect: adhesion to coating interface.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian