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Epoxy resin paint crosslinking agent at room temperature
2017-8-5 16:02:16
Epoxy resin paint crosslinking agent at room temperature
The application of epoxy resin in various fields is very wide, but only when the crosslinking agent is added, and the addition of crosslinking agent is essential.
At room temperature epoxy resin crosslinking agent also develops, especially in the condition of not suitable heating, can be at room temperature quick crosslinked at room temperature epoxy resin crosslinking agent becomes the first choice. In this paper, the preparation and modification of high temperature epoxy resin crosslinking agent for quick crosslinking at room temperature are introduced, and its development prospect is prospected.
Epoxy resin is a molecule has two or more than two epoxy group general, in the process of the polymers with ether and ZhongChunJi on main chain, the two end of epoxy group, with a variety of ring opening reaction of compounds containing active hydrogen, crosslinking couplet net structure, as a kind of widely used polymer materials, is an important kind of thermosetting resin varieties.
Only when the epoxy resin is added to the crosslinking agent, it can be applied, and the addition of crosslinking agent is essential. In addition, the room temperature of epoxy resin crosslinking is a way of energy saving of crosslinking and crosslinking process simple, suitable for heating crosslinking sites, such as coating and adhesive used in civil construction such as due to heating is difficult, need to normal temperature crosslinking. Therefore, the development of crosslinking agent is more important.
Epoxy resin crosslinking agent classification. There are many kinds of epoxy resin crosslinking agents. By the crosslinking temperature, can be divided into high temperature (> 100 ℃), medium temperature (50 ~ 100 ℃) and room temperature ~ 50 ℃ (room temperature) and low temperature (room temperature); According to crosslinking reaction type, can be divided into catalytic type and crosslinking type; According to the chemical composition, it can be divided into amine, anhydride, heterocyclic compounds and their modificates and potential couplets.
Crosslinking agent by crosslinked by fast to slow, there are aliphatic > alicyclic > > aromatic amides, and is suitable for room temperature crosslinking are: aliphatic polyamine, alicyclic amine, low molecular polyamide and modified aromatic amine, etc.
Therefore, the epoxy resin crosslinking agent which is suitable for room temperature rapid crosslinking is mostly fatty polyamine, polyamine and low molecular polyamide.
They all belong to amine crosslinking agent. This kind of crosslinking agent is the earliest use of the room temperature fast crosslinking crosslinking agent, the variety is much, the use is wide, has the excellent adhesion to most of the adhesive, the crosslinking chemical drug is good.
But amine crosslinking agent toxicity of some volatile big, big, can affect the health of operators, and have strong ability to absorb carbon dioxide, water imbibition surface is white phenomenon after crosslinking and foaming, electric performance is not good enough, bonding strength is not high.
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
The application of epoxy resin in various fields is very wide, but only when the crosslinking agent is added, and the addition of crosslinking agent is essential.
At room temperature epoxy resin crosslinking agent also develops, especially in the condition of not suitable heating, can be at room temperature quick crosslinked at room temperature epoxy resin crosslinking agent becomes the first choice. In this paper, the preparation and modification of high temperature epoxy resin crosslinking agent for quick crosslinking at room temperature are introduced, and its development prospect is prospected.
Epoxy resin is a molecule has two or more than two epoxy group general, in the process of the polymers with ether and ZhongChunJi on main chain, the two end of epoxy group, with a variety of ring opening reaction of compounds containing active hydrogen, crosslinking couplet net structure, as a kind of widely used polymer materials, is an important kind of thermosetting resin varieties.
Only when the epoxy resin is added to the crosslinking agent, it can be applied, and the addition of crosslinking agent is essential. In addition, the room temperature of epoxy resin crosslinking is a way of energy saving of crosslinking and crosslinking process simple, suitable for heating crosslinking sites, such as coating and adhesive used in civil construction such as due to heating is difficult, need to normal temperature crosslinking. Therefore, the development of crosslinking agent is more important.
Epoxy resin crosslinking agent classification. There are many kinds of epoxy resin crosslinking agents. By the crosslinking temperature, can be divided into high temperature (> 100 ℃), medium temperature (50 ~ 100 ℃) and room temperature ~ 50 ℃ (room temperature) and low temperature (room temperature); According to crosslinking reaction type, can be divided into catalytic type and crosslinking type; According to the chemical composition, it can be divided into amine, anhydride, heterocyclic compounds and their modificates and potential couplets.
Crosslinking agent by crosslinked by fast to slow, there are aliphatic > alicyclic > > aromatic amides, and is suitable for room temperature crosslinking are: aliphatic polyamine, alicyclic amine, low molecular polyamide and modified aromatic amine, etc.
Therefore, the epoxy resin crosslinking agent which is suitable for room temperature rapid crosslinking is mostly fatty polyamine, polyamine and low molecular polyamide.
They all belong to amine crosslinking agent. This kind of crosslinking agent is the earliest use of the room temperature fast crosslinking crosslinking agent, the variety is much, the use is wide, has the excellent adhesion to most of the adhesive, the crosslinking chemical drug is good.
But amine crosslinking agent toxicity of some volatile big, big, can affect the health of operators, and have strong ability to absorb carbon dioxide, water imbibition surface is white phenomenon after crosslinking and foaming, electric performance is not good enough, bonding strength is not high.
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
Joerg Volle et al. developed an epoxy-resin crosslinking agent with the use of polyethylene polyamines and phenyl glycolic ether/cresol glycidyl ether/glycidyl ether. The preparation of the crosslinking agent with low viscosity, can be crosslinked at room temperature, crosslinking 10 ~ 30 ℃ temperature range.
Modified amine crosslinking agent: modified fatty amine
A. B - hydroxyethyl ethylenediamine (120 #) : ethylenediamine and diethylenetriamine react with ethylene oxide in a small amount of water. Viscous liquid, its volatility and toxicity is more than 10003 times less than ethylenediamine. Quick crosslinking epoxy resin at room temperature with 16 to 18 percent.
B. The addition of diethylene triamine and butyl glycidyl ether
59 # crosslinking agent, viscosity of 25 ℃ is 0.2 Pa. S, activity, low toxicity, room-temperature fast crosslinked epoxy resin, flexible good crosslinking. The dosage is 23-25%, and the heat response of epoxy resin will be alleviated and the service life will be about 1 hour.
C. Ethylene triamine acrylonitrile copolymer (B cyanide), 591 # crosslinking agent
The adduct is light yellow liquid, low toxicity, heat quantity is small, long service life, need to heat the crosslinking and crosslinking conditions: 80 ℃, 12 h; The dosage is 20-25%.
D. Microbe: light brown liquid, dosage of 12-14 %, crosslinking condition: room temperature, 48 hours h.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Joerg Volle et al. developed an epoxy-resin crosslinking agent with the use of polyethylene polyamines and phenyl glycolic ether/cresol glycidyl ether/glycidyl ether. The preparation of the crosslinking agent with low viscosity, can be crosslinked at room temperature, crosslinking 10 ~ 30 ℃ temperature range.
Modified amine crosslinking agent: modified fatty amine
A. B - hydroxyethyl ethylenediamine (120 #) : ethylenediamine and diethylenetriamine react with ethylene oxide in a small amount of water. Viscous liquid, its volatility and toxicity is more than 10003 times less than ethylenediamine. Quick crosslinking epoxy resin at room temperature with 16 to 18 percent.
B. The addition of diethylene triamine and butyl glycidyl ether
59 # crosslinking agent, viscosity of 25 ℃ is 0.2 Pa. S, activity, low toxicity, room-temperature fast crosslinked epoxy resin, flexible good crosslinking. The dosage is 23-25%, and the heat response of epoxy resin will be alleviated and the service life will be about 1 hour.
C. Ethylene triamine acrylonitrile copolymer (B cyanide), 591 # crosslinking agent
The adduct is light yellow liquid, low toxicity, heat quantity is small, long service life, need to heat the crosslinking and crosslinking conditions: 80 ℃, 12 h; The dosage is 20-25%.
D. Microbe: light brown liquid, dosage of 12-14 %, crosslinking condition: room temperature, 48 hours h.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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