News Details
Coating epoxy resin crosslinking accelerator
2017-7-17 23:35:51
Coating epoxy resin crosslinking accelerator is a kind of material which can accelerate the crosslinking of epoxy resin, reduce the crosslinking temperature, and shorten the crosslinking time.
Due to promote agent, crosslinking agent, | epoxy group in order to form a charge deviation between the six-member ring transition state to implement, so close to electrical promoter for sexual intercourse nucleophilic agent, nucleophilic promoter of electrophilic intercourse agent is effective.
When the amino group is cross-linked with epoxy resin, all the reagents that contain one OH, one COOH, one S03 H, C () NH2, one S02NH2, and one S03NHR all contribute to the reaction. For example, phenol (phenol, chlorphenol, polyphenol), acid (salicylic acid), amide and so on can be used as promoters, generally 5 ~ 10 portions.
The reagents that contain one OR (R not H), a C (1), OR a SO3R, a CONR2, a C02NR2, a SO2NH2, and N02 are all inhibiting.
The crosslinking agent of acid anhydride and epoxy resins is slow, and the promoter is usually added, which is commonly used in tert, quaternary ammonium salt and sometimes organic acid salt and potassium hydroxide.
The commonly used epoxy resins crosslinking accelerators have organic amines such as tertiary amine, methyldiethylenediamine and aminophenol. It is commonly used in the two groups of epoxy resin floor coatings to promote the brand of amine crosslinking agent with DMP - 30 (tianjin), HY960 tertiary accelerator (USA), OP - 8658 / dp-300 coating drying, epoxy resin crosslinking accelerator.
In addition to the agent of amine crosslinking agent, it is sometimes possible to use acid epoxy resin crosslinked accelerant, such as salicylic acid, and to add quaternary ammonium salt at low temperature.
In order to have the plasticizing effect of epoxy resin, and reduce the brittle after low molecular weight epoxy resin film, some of the epoxy floor paint composition formula of crosslinking agent is: amine crosslinking agent: benzyl alcohol: salicylic acid: quaternary ammonium salt = 40-50: (48) : (2-10) : (0 to 3).
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
Due to promote agent, crosslinking agent, | epoxy group in order to form a charge deviation between the six-member ring transition state to implement, so close to electrical promoter for sexual intercourse nucleophilic agent, nucleophilic promoter of electrophilic intercourse agent is effective.
When the amino group is cross-linked with epoxy resin, all the reagents that contain one OH, one COOH, one S03 H, C () NH2, one S02NH2, and one S03NHR all contribute to the reaction. For example, phenol (phenol, chlorphenol, polyphenol), acid (salicylic acid), amide and so on can be used as promoters, generally 5 ~ 10 portions.
The reagents that contain one OR (R not H), a C (1), OR a SO3R, a CONR2, a C02NR2, a SO2NH2, and N02 are all inhibiting.
The crosslinking agent of acid anhydride and epoxy resins is slow, and the promoter is usually added, which is commonly used in tert, quaternary ammonium salt and sometimes organic acid salt and potassium hydroxide.
The commonly used epoxy resins crosslinking accelerators have organic amines such as tertiary amine, methyldiethylenediamine and aminophenol. It is commonly used in the two groups of epoxy resin floor coatings to promote the brand of amine crosslinking agent with DMP - 30 (tianjin), HY960 tertiary accelerator (USA), OP - 8658 / dp-300 coating drying, epoxy resin crosslinking accelerator.
In addition to the agent of amine crosslinking agent, it is sometimes possible to use acid epoxy resin crosslinked accelerant, such as salicylic acid, and to add quaternary ammonium salt at low temperature.
In order to have the plasticizing effect of epoxy resin, and reduce the brittle after low molecular weight epoxy resin film, some of the epoxy floor paint composition formula of crosslinking agent is: amine crosslinking agent: benzyl alcohol: salicylic acid: quaternary ammonium salt = 40-50: (48) : (2-10) : (0 to 3).
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
Among them, benzene methanol is the solvent of salicylic acid and ACTS as the plasticizing effect of epoxy resin, which can reduce the brittleness of the low molecular weight epoxy resin.
Quaternary ammonium salt is also called the quaternary ammonium salt, four hydrogen atoms are replaced by alkyl ammonium ion in the form of compounds, the structure of the general formula R4N + x, which R can be the same or different hydroxyl, x is halogen atoms more, also can be acid radical.
Quaternary ammonium salt is a promising latent accelerator, promoting mechanism of carboxylic acid double salt, similar to the tertiary amine of acid anhydride/epoxy resin system for promoting effect as well as tertiary amine, but storage life at room temperature is about 8 times that of the tertiary amine, physical and mechanical properties of crosslinked slightly better than promotion system of tertiary amine. Benzyl triethyl ammonium chloride, for example, when the temperature < 80 ℃ according to the mechanism of cationic reaction, and above 120 ℃ decomposed into tertiary amine and quaternary ammonium salt halogenated, according to the mechanism of anionic catalytic crosslinking reaction.
The most promising method of cross-linking agent for emulsion coatings is the introduction of unsaturated groups in the polymer, which can automatically oxidize crosslinking. It is possible to introduce double bonds with allyl monomers or polymer synthesis, which is called postfunctionalization. To obtain the best film performance, the polymer diffusion speed must be greater than the crosslinking speed. As we all know, dual component coatings, crosslinking agents should be mixed before use.
New concept is the preparation of a known as the single packing of two-component coating (two - pack - in - one - pot), its meaning is a functional groups of the two components are incompatible or limited compatibility, but both are latex or with water medium, the mixture of two component functional groups will not contact, so, won't response in front of the paint film is dry. When water evaporates, functional groups are exposed to effective and rapid crosslinking reactions. The crosslinking agent requires formaldehyde to release low, the crosslinking temperature is low, the crosslinking speed is fast, the environment is friendly.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Among them, benzene methanol is the solvent of salicylic acid and ACTS as the plasticizing effect of epoxy resin, which can reduce the brittleness of the low molecular weight epoxy resin.
Quaternary ammonium salt is also called the quaternary ammonium salt, four hydrogen atoms are replaced by alkyl ammonium ion in the form of compounds, the structure of the general formula R4N + x, which R can be the same or different hydroxyl, x is halogen atoms more, also can be acid radical.
Quaternary ammonium salt is a promising latent accelerator, promoting mechanism of carboxylic acid double salt, similar to the tertiary amine of acid anhydride/epoxy resin system for promoting effect as well as tertiary amine, but storage life at room temperature is about 8 times that of the tertiary amine, physical and mechanical properties of crosslinked slightly better than promotion system of tertiary amine. Benzyl triethyl ammonium chloride, for example, when the temperature < 80 ℃ according to the mechanism of cationic reaction, and above 120 ℃ decomposed into tertiary amine and quaternary ammonium salt halogenated, according to the mechanism of anionic catalytic crosslinking reaction.
The most promising method of cross-linking agent for emulsion coatings is the introduction of unsaturated groups in the polymer, which can automatically oxidize crosslinking. It is possible to introduce double bonds with allyl monomers or polymer synthesis, which is called postfunctionalization. To obtain the best film performance, the polymer diffusion speed must be greater than the crosslinking speed. As we all know, dual component coatings, crosslinking agents should be mixed before use.
New concept is the preparation of a known as the single packing of two-component coating (two - pack - in - one - pot), its meaning is a functional groups of the two components are incompatible or limited compatibility, but both are latex or with water medium, the mixture of two component functional groups will not contact, so, won't response in front of the paint film is dry. When water evaporates, functional groups are exposed to effective and rapid crosslinking reactions. The crosslinking agent requires formaldehyde to release low, the crosslinking temperature is low, the crosslinking speed is fast, the environment is friendly.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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