News Details
Epoxy resin organic acid anhydride coating crosslinking agent
2017-7-22 11:20:19
Epoxy resin organic acid anhydride coating crosslinking agent, also belongs to the addition polymerization type crosslinking agent. As early as 1936, the Swiss Dr. Pierre Castan began to use phthalic anhydride cross-linked epoxy resin for denture material.
Epoxy resin organic acid anhydride cross-linking agent for large-scale casting and other heavy power sector, is still the main direction of the application of such cross-linking agent. Japan this type of cross-linking agent consumption of more than 3 kt per year, accounting for about 23% of the total amount of epoxy resin crosslinking agent, second only to the amount of organic polyamine.
In China, with phthalic anhydride as a cross-linking agent for epoxy resin casting, tung olein anhydride as a cross-linking agent for epoxy resin insulation, have more than 20 years of application history.
In recent years, with the development of electrical and electronic industries, acid anhydride cross-linking agents have also been widely used in medium and small electrical appliances, especially in terms of weak, and have gained sufficient attention, such as encapsulation of integrated circuits, Letters and so on. In the coating, such as powder coatings, such cross-linking agent is also taken seriously.
Epoxy resin organic acid anhydride cross-linking agent and multi-amine cross-linking agent, there are many advantages. From the operation process point of view, mainly the following: First, the volatile small, low toxicity, the skin irritation is small; Second, the amount of epoxy resin with a large amount of epoxy resin melt viscosity, You can add more filler to modify, is conducive to reducing costs; Third, the use of long, easy to operate.
From the nature of the cross-linked material, its main features are: First, due to slow cross-linking reaction, shrinkage is smaller; Second, there is a high heat distortion temperature, excellent heat resistance, cross-linked color; Is mechanical, electrical performance is excellent.
However, the cross-linking temperature required for epoxy resin organic acid anhydride cross-linking agent is relatively high, the crosslinking cycle is relatively long; it is not easy to modify; it is easy to absorb moisture when stored to produce free acid and adversely affect (crosslinking speed is slow, Crosslinked product performance degradation); cross-linked products of alkali, solvent resistance is relatively poor, and so on, it is the lack of such cross-linking agent.
In the known acid anhydride compounds, most are being widely used as epoxy resin crosslinking agent, about 20 species, can be divided into single type, mixed type, eutectic mixed type.
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
Epoxy resin organic acid anhydride cross-linking agent for large-scale casting and other heavy power sector, is still the main direction of the application of such cross-linking agent. Japan this type of cross-linking agent consumption of more than 3 kt per year, accounting for about 23% of the total amount of epoxy resin crosslinking agent, second only to the amount of organic polyamine.
In China, with phthalic anhydride as a cross-linking agent for epoxy resin casting, tung olein anhydride as a cross-linking agent for epoxy resin insulation, have more than 20 years of application history.
In recent years, with the development of electrical and electronic industries, acid anhydride cross-linking agents have also been widely used in medium and small electrical appliances, especially in terms of weak, and have gained sufficient attention, such as encapsulation of integrated circuits, Letters and so on. In the coating, such as powder coatings, such cross-linking agent is also taken seriously.
Epoxy resin organic acid anhydride cross-linking agent and multi-amine cross-linking agent, there are many advantages. From the operation process point of view, mainly the following: First, the volatile small, low toxicity, the skin irritation is small; Second, the amount of epoxy resin with a large amount of epoxy resin melt viscosity, You can add more filler to modify, is conducive to reducing costs; Third, the use of long, easy to operate.
From the nature of the cross-linked material, its main features are: First, due to slow cross-linking reaction, shrinkage is smaller; Second, there is a high heat distortion temperature, excellent heat resistance, cross-linked color; Is mechanical, electrical performance is excellent.
However, the cross-linking temperature required for epoxy resin organic acid anhydride cross-linking agent is relatively high, the crosslinking cycle is relatively long; it is not easy to modify; it is easy to absorb moisture when stored to produce free acid and adversely affect (crosslinking speed is slow, Crosslinked product performance degradation); cross-linked products of alkali, solvent resistance is relatively poor, and so on, it is the lack of such cross-linking agent.
In the known acid anhydride compounds, most are being widely used as epoxy resin crosslinking agent, about 20 species, can be divided into single type, mixed type, eutectic mixed type.
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
From the chemical structure of the points, can be divided into straight chain, alicyclic, aromatic, halogenated anhydride type; such as by functional group classification, there are single functional group, bifunctional group, more than two functional groups value.
Similar to the case of the polyamine cross-linking agent, the number of functional groups also directly affects the heat resistance of the crosslinked species. Alternatively, it may be classified according to the presence or absence of the free acid because the presence of the free acid acts as a crosslinking reaction enhancement.
In the absence of accelerator, the first hydroxyl group in the hydroxyl and acid anhydride reaction, open acid anhydride, and then the addition polymerization reaction, the order is as follows: (1) hydroxyl reaction of acid anhydride to produce ester bond and carboxylic acid; Carboxylic acid to the epoxy group addition, the formation of hydroxyl; (3) the formation of hydroxyl and other anhydride groups continue to react.
This reaction is repeated to produce a bulk polymer. In addition, in such a system, the reaction in parallel with the above reaction due to the acidic state is the reaction of another epoxy group with a hydroxyl group to form an ether bond. From the above mechanism, it can be seen that the crosslinked compound contains both ether bond and ester bond, and the reaction rate is dominated by epoxy concentration and hydroxyl concentration.
In the presence of the accelerator, the anhydride cross-linking reaction is promoted with Lewis bases. (1) accelerator attack acid anhydride, the formation of carboxylate anion; (2) carboxylate anion and epoxy reaction, the formation of oxygen (the use of tertiary amine) on the acid anhydride attack initiation reaction, the main reaction: Anions; (3) oxygen anions react with other anhydrides to form carboxylate anions again.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
From the chemical structure of the points, can be divided into straight chain, alicyclic, aromatic, halogenated anhydride type; such as by functional group classification, there are single functional group, bifunctional group, more than two functional groups value.
Similar to the case of the polyamine cross-linking agent, the number of functional groups also directly affects the heat resistance of the crosslinked species. Alternatively, it may be classified according to the presence or absence of the free acid because the presence of the free acid acts as a crosslinking reaction enhancement.
In the absence of accelerator, the first hydroxyl group in the hydroxyl and acid anhydride reaction, open acid anhydride, and then the addition polymerization reaction, the order is as follows: (1) hydroxyl reaction of acid anhydride to produce ester bond and carboxylic acid; Carboxylic acid to the epoxy group addition, the formation of hydroxyl; (3) the formation of hydroxyl and other anhydride groups continue to react.
This reaction is repeated to produce a bulk polymer. In addition, in such a system, the reaction in parallel with the above reaction due to the acidic state is the reaction of another epoxy group with a hydroxyl group to form an ether bond. From the above mechanism, it can be seen that the crosslinked compound contains both ether bond and ester bond, and the reaction rate is dominated by epoxy concentration and hydroxyl concentration.
In the presence of the accelerator, the anhydride cross-linking reaction is promoted with Lewis bases. (1) accelerator attack acid anhydride, the formation of carboxylate anion; (2) carboxylate anion and epoxy reaction, the formation of oxygen (the use of tertiary amine) on the acid anhydride attack initiation reaction, the main reaction: Anions; (3) oxygen anions react with other anhydrides to form carboxylate anions again.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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