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The condensation reaction of thiourea and coatings with amine crosslinking agent
2017-8-5 16:02:06
The condensation reaction of thiourea and coatings with amine crosslinking agent
The method of condensation reaction of thiourea and amine crosslinking agent is aimed at the unmodified thiourea as solid, which is inconvenient and crosslinking speed.
However, the condensation reaction of thiourea and amine crosslinking agent is less volatile and less toxic. It can be used as a room temperature crosslinking agent, but it is not suitable for a large amount of adhesive.
Mannich reactions are made of diamines, diethylenediamine, diamine, diphenylenediamine, phenylenediamine, etc. Such modified amine are belong to the category of phenolic modified amine, crosslinking agent molecules containing lively phenolic hydroxyl and amine hydrogen, crosslinking agent is greatly enhanced reactivity, improved the amine and epoxy crosslinking reaction speed, easy to form highly reticular crosslinked structure, and at the same time with phenolic skeleton structure, further improving the heat distortion temperature, improved the heat resistance of crosslinking content, corrosion resistance and therefore widely used in anticorrosive coatings, adhesive and laminated material and glass fiber reinforced plastic production, etc.
In addition to the above methods of modification, there are other ways of modification. Example: aniline, formaldehyde polyphenylamine formaldehyde resin as epoxy crosslinking agent; The properties of n-butyl borate, diethylene glycol (or propylene glycol) modified dimethyl ethanolamine can be obtained by the excellent medium temperature crosslinking agent. Boron trifluoride - (BF3) and amines such as ethylamine, phenylamine, p-methylaniline, n-methylaniline and other formation complexes, at room temperature have excellent stability.
15-30 ℃ can save more than six months, under room temperature, rapid decomposition, emits the amine epoxy crosslinking rapidly, so is a good latent type crosslinking agent; By phthalic anhydride reaction with divinyl three amine to produce the development of amide ring compound, 25 ℃ placed six months stability, decomposition of around 80 ℃ are neighbors benzol imine 2, crosslinking and divinyl three amine epoxy resin; In addition, the addition of screw cyclodiamine is also a good cross-linking agent.
In addition, for some of the crosslinking agent with physical method modified amine department, aims to change physical state or adjust the crosslinking reaction rate, for example, a low concentration of eutectic amine according to certain proportion miscibility, form a eutectic, facilitate crosslinking operation.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The method of condensation reaction of thiourea and amine crosslinking agent is aimed at the unmodified thiourea as solid, which is inconvenient and crosslinking speed.
However, the condensation reaction of thiourea and amine crosslinking agent is less volatile and less toxic. It can be used as a room temperature crosslinking agent, but it is not suitable for a large amount of adhesive.
Mannich reactions are made of diamines, diethylenediamine, diamine, diphenylenediamine, phenylenediamine, etc. Such modified amine are belong to the category of phenolic modified amine, crosslinking agent molecules containing lively phenolic hydroxyl and amine hydrogen, crosslinking agent is greatly enhanced reactivity, improved the amine and epoxy crosslinking reaction speed, easy to form highly reticular crosslinked structure, and at the same time with phenolic skeleton structure, further improving the heat distortion temperature, improved the heat resistance of crosslinking content, corrosion resistance and therefore widely used in anticorrosive coatings, adhesive and laminated material and glass fiber reinforced plastic production, etc.
In addition to the above methods of modification, there are other ways of modification. Example: aniline, formaldehyde polyphenylamine formaldehyde resin as epoxy crosslinking agent; The properties of n-butyl borate, diethylene glycol (or propylene glycol) modified dimethyl ethanolamine can be obtained by the excellent medium temperature crosslinking agent. Boron trifluoride - (BF3) and amines such as ethylamine, phenylamine, p-methylaniline, n-methylaniline and other formation complexes, at room temperature have excellent stability.
15-30 ℃ can save more than six months, under room temperature, rapid decomposition, emits the amine epoxy crosslinking rapidly, so is a good latent type crosslinking agent; By phthalic anhydride reaction with divinyl three amine to produce the development of amide ring compound, 25 ℃ placed six months stability, decomposition of around 80 ℃ are neighbors benzol imine 2, crosslinking and divinyl three amine epoxy resin; In addition, the addition of screw cyclodiamine is also a good cross-linking agent.
In addition, for some of the crosslinking agent with physical method modified amine department, aims to change physical state or adjust the crosslinking reaction rate, for example, a low concentration of eutectic amine according to certain proportion miscibility, form a eutectic, facilitate crosslinking operation.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
Its appearance is amber transparent liquid. Liquid fat and solid aromatic amine mix to form a liquid mixture, containing mimidazol-type stimulants of mesodimethylamine and 4 ', 4 '- diamino-methane mixtures.
Solid-state aromatic amines can also be obtained by means of preparation of cold liquids. Such as m-phenylene diamine heating melting, heating up to 115-120 ℃, the heat preservation 5 min, and then the natural cooling for a quick m-phenylene diamine supercooled liquid, easy to use.
Super coordination silicate stability at room temperature, but unstable at high temperatures, heating type silicate decomposition of free amine and 4 coordination of silicon compounds, so as the latent sexual intercourse agent of epoxy resin is effective. In addition, it can be used as crosslinking reaction accelerator for acid anhydride crosslinking agent, which can be used for casting and bonding several layers.
Synthesis method: boil the methanol solution of trimethoxyphenyl silane, phthalate and benziline for 10-15min. The resulting crystal sediment was filtered and washed with cold methanol, with benzyl dimethylamine dimethyl silicate PhCH2NHMe2PhSi (C6H4O2) 2.
The silicate 2, 100 with the partial benzene anhydride 14 3 armour of bisphenol A type epoxy resin composites have five months of storage period at room temperature, the crosslinking conditions of 200 ℃, 8.5 s.
Ethylenediamine silicate si2 (H2NCH2CH2NH 3) 2 - (C6H4O2) 3 in liquid bisphenol A type epoxy resin added 25%, the compound can be stored at room temperature, 300 d, more than 175 ℃. 130 min after crosslinking tensile strength of 20.67 MPa.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Its appearance is amber transparent liquid. Liquid fat and solid aromatic amine mix to form a liquid mixture, containing mimidazol-type stimulants of mesodimethylamine and 4 ', 4 '- diamino-methane mixtures.
Solid-state aromatic amines can also be obtained by means of preparation of cold liquids. Such as m-phenylene diamine heating melting, heating up to 115-120 ℃, the heat preservation 5 min, and then the natural cooling for a quick m-phenylene diamine supercooled liquid, easy to use.
Super coordination silicate stability at room temperature, but unstable at high temperatures, heating type silicate decomposition of free amine and 4 coordination of silicon compounds, so as the latent sexual intercourse agent of epoxy resin is effective. In addition, it can be used as crosslinking reaction accelerator for acid anhydride crosslinking agent, which can be used for casting and bonding several layers.
Synthesis method: boil the methanol solution of trimethoxyphenyl silane, phthalate and benziline for 10-15min. The resulting crystal sediment was filtered and washed with cold methanol, with benzyl dimethylamine dimethyl silicate PhCH2NHMe2PhSi (C6H4O2) 2.
The silicate 2, 100 with the partial benzene anhydride 14 3 armour of bisphenol A type epoxy resin composites have five months of storage period at room temperature, the crosslinking conditions of 200 ℃, 8.5 s.
Ethylenediamine silicate si2 (H2NCH2CH2NH 3) 2 - (C6H4O2) 3 in liquid bisphenol A type epoxy resin added 25%, the compound can be stored at room temperature, 300 d, more than 175 ℃. 130 min after crosslinking tensile strength of 20.67 MPa.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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