News Details
Coating with low toxicity, non-toxic crosslinking agent
2017-4-26 22:39:12
Coating with low toxicity, non-toxic crosslinking agent. Now the industry is not only focus on crosslinking agent in the process of the production and use of toxicity and environmental pollution problems, and attaches great importance to the epoxy resin waste pollution problem for a long time.
According to introducing, in developed countries, the bigger toxicity of polyene more glue, aromatic amines have been replaced by the non-toxic or low toxic modified amine.
Aromatic amine refers to have a sexual substituent aromatic amine - - NH2, NH - or nitrogen groups connected to an aromatic hydrocarbon, aromatic hydrocarbon structure usually contains one or more of the benzene ring. Aniline is the most simple example these compounds. Aromatic amine molecules high reactivity. Aromatic amine is commonly high boiling point of the low melting point of solid or liquid, has a special smell, bigger toxicity.
Structure in aromatic amine aniline, n are the lone electron to occupy on the SP2 hybrid orbitals, and benzene PI electron orbital overlap, the formation of nitrogen and benzene ring, conjugated PI molecular orbitals. The structure of aniline as shown.
Aromatic amine for high boiling point of the low melting point of solid or liquid, has a special smell, toxicity is very big, such as aniline can breathe, eat, or absorbed through the skin and cause poisoning, eating 0.25 mL severe poisoning. Beta - naphthylamine and benzidine is caused by malignant tumor.
Aromatic amine with amine alkali, alkaline is generally weak, can occur with the acid salt reaction, besides aromatic amine with some properties.
N on the aromatic amine extremely easy oxidation of hydrogen, as oxidant species and different reaction conditions, oxidation product is different also. On the oxidation reaction of aromatic amine aromatic amine aromatic ring of electrophilic substitution reaction.
In the aromatic electrophilic substitution reaction, H2N -- RNH -- R2NH -- ArNH - is para positioning base, and the matching between ammonium salt H3N + etc is a positioning base.
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
Halogenated reaction 1. Halogenated: aniline halogenated directly, in addition to react with iodine to produce iodine aniline, reaction is difficult to stay in the generation phase.
Acylation reaction 2. Acylation: primary and secondary aromatic amine hydrogen nitrogen, as a result of amino nitrogen and benzene ring of carbon can acylation reaction, the yield is low, but after with acyl amino protection, aromatic ring of carbon on the acylation reaction can proceed smoothly.
Sulfonation reaction 3. The sulfonated: sulfonated first with aniline sulfate salt, if use fuming sulfuric acid as sulfonating agent, reaction at room temperature, mainly between a substitution product, if use sulfuric acid sulfonation, reaction under the condition of heating for a long time, is the main product is a product counterpoint to replace.
4. Nitration nitration: direct nitration, amino by nitric acid oxidation, conversion rate is low, in order to prevent the oxidation of amino, preparation of frequent use of acetylation reaction to protect amino, reaction will again after acetyl removal.
Some linear polymer compound, miscibility with resin, containing reactive group, can participate in the crosslinking reaction of the resin, improve the elongation at break and impact strength, but the thermal deformation temperature decreased, this material is called a soft agent, commonly used liquid polysulfide rubber, NBR, due to their cooperate with resin in moderation, can be made into structural adhesive glue agent, so will also increase the soft agent as toughening agent and so on. Add softness and toughening is relate to each other and not the same concept, but in fact it is difficult to distinguish strictly.
Theoretically different toughening with increasing soft, toughening diffusion don't make the material as a whole, but rather to epoxy crosslinking homogeneous system into a multiphase system, namely the flexibilizer aggregation into spherical particles in epoxy crosslinking network structure of the continuous phase, and the formation of dispersed phase cracking resistance mutations, the fracture toughness increased significantly, but the mechanical properties, heat resistance losses small.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
According to introducing, in developed countries, the bigger toxicity of polyene more glue, aromatic amines have been replaced by the non-toxic or low toxic modified amine.
Aromatic amine refers to have a sexual substituent aromatic amine - - NH2, NH - or nitrogen groups connected to an aromatic hydrocarbon, aromatic hydrocarbon structure usually contains one or more of the benzene ring. Aniline is the most simple example these compounds. Aromatic amine molecules high reactivity. Aromatic amine is commonly high boiling point of the low melting point of solid or liquid, has a special smell, bigger toxicity.
Structure in aromatic amine aniline, n are the lone electron to occupy on the SP2 hybrid orbitals, and benzene PI electron orbital overlap, the formation of nitrogen and benzene ring, conjugated PI molecular orbitals. The structure of aniline as shown.
Aromatic amine for high boiling point of the low melting point of solid or liquid, has a special smell, toxicity is very big, such as aniline can breathe, eat, or absorbed through the skin and cause poisoning, eating 0.25 mL severe poisoning. Beta - naphthylamine and benzidine is caused by malignant tumor.
Aromatic amine with amine alkali, alkaline is generally weak, can occur with the acid salt reaction, besides aromatic amine with some properties.
N on the aromatic amine extremely easy oxidation of hydrogen, as oxidant species and different reaction conditions, oxidation product is different also. On the oxidation reaction of aromatic amine aromatic amine aromatic ring of electrophilic substitution reaction.
In the aromatic electrophilic substitution reaction, H2N -- RNH -- R2NH -- ArNH - is para positioning base, and the matching between ammonium salt H3N + etc is a positioning base.
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
Halogenated reaction 1. Halogenated: aniline halogenated directly, in addition to react with iodine to produce iodine aniline, reaction is difficult to stay in the generation phase.
Acylation reaction 2. Acylation: primary and secondary aromatic amine hydrogen nitrogen, as a result of amino nitrogen and benzene ring of carbon can acylation reaction, the yield is low, but after with acyl amino protection, aromatic ring of carbon on the acylation reaction can proceed smoothly.
Sulfonation reaction 3. The sulfonated: sulfonated first with aniline sulfate salt, if use fuming sulfuric acid as sulfonating agent, reaction at room temperature, mainly between a substitution product, if use sulfuric acid sulfonation, reaction under the condition of heating for a long time, is the main product is a product counterpoint to replace.
4. Nitration nitration: direct nitration, amino by nitric acid oxidation, conversion rate is low, in order to prevent the oxidation of amino, preparation of frequent use of acetylation reaction to protect amino, reaction will again after acetyl removal.
Some linear polymer compound, miscibility with resin, containing reactive group, can participate in the crosslinking reaction of the resin, improve the elongation at break and impact strength, but the thermal deformation temperature decreased, this material is called a soft agent, commonly used liquid polysulfide rubber, NBR, due to their cooperate with resin in moderation, can be made into structural adhesive glue agent, so will also increase the soft agent as toughening agent and so on. Add softness and toughening is relate to each other and not the same concept, but in fact it is difficult to distinguish strictly.
Theoretically different toughening with increasing soft, toughening diffusion don't make the material as a whole, but rather to epoxy crosslinking homogeneous system into a multiphase system, namely the flexibilizer aggregation into spherical particles in epoxy crosslinking network structure of the continuous phase, and the formation of dispersed phase cracking resistance mutations, the fracture toughness increased significantly, but the mechanical properties, heat resistance losses small.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian