News Details
Polyamine coating crosslinking agent
2017-7-21 11:10:52
Polyamine coating crosslinking agent with carbonyl compounds. The polyamine is blocked with a ketone compound to form a latent crosslinking agent, a ketimine crosslinker. Encountered water or water vapor, ketimine and H20 role in the production of primary amine, which is ketimine in water and humid environment can make epoxy resin crosslinking the basic reasons.
The method of preparing ketimine is generally as follows: (1) a polyamine containing two secondary amine groups and more than one primary amine group is reacted with a low molecular weight ketone such as H2N (CH2) 3NHCHzCH2NH (CH2) 3NH2 polyamine, with methyl isobutyl ketone closed, can be prepared from a chelate ketone imine. This ketimine is mixed with bisphenol A epoxy resin to produce a single packaged epoxy adhesive under anhydrous conditions.
In a humid environment, this adhesive can be better cross-linked. (2) directly with polyamines, ketones and epoxy resin mixed to form a single package of epoxy adhesive (must avoid contact with water, wet steam). For example, 16 parts of diethylenetriamine, 49 parts of Epikote 1001 epoxy resin, 30 parts of methyl isobutyl ketone, 30 parts of butanone and 50 parts of toluene can be used as a coating which can be stably stored at room temperature.
This coating is coated on the steel plate, after 3d cross-linking, can form a high peel strength of the coating. (3) the use of fatty polyamines and hindered ketones (that is, ketone groups on both sides of a carbon group with more carbon atoms, such as methyl isobutyl ketone) reaction, preparation of imidazoline group containing ketimine compounds. The ketone imine can be dispersed in an aqueous solution by means of a solvating aid such as acetic acid to form an amine-based amine crosslinking agent for the production of water-soluble epoxy coatings and electrophoretic varnishes.
The basic method for preparing ketimine is to dissolve the ketone and the polyamine in a solvent such as benzene or cyclohexane, add an acidic catalyst (dehydrating agent, preferably a strong acid cation exchange resin), heating (70 to 100 Lt; 0 & gt; C), the water produced in the reaction is continuously removed by azeotropy, and then the solvent is removed by vacuum distillation to produce ketimine, and the product is stored in a sealed refrigerator.
For example, 47.7 g of diethylenetriamine, 99.5 g of methyl isobutyl ketone, 0.25 g of Dodeex 50w-x8 type ion exchange resin and sufficient benzene were added to a 2 L reaction flask to bring the total volume of the reactants to 750 mL, (16.6 g), and then the solvent was removed by means of a rotary vacuum evaporator to produce ketimine, and the product was stored in a brown bottle.
Chinese name: Diethyl toluene diamine(DETDA)
The method of preparing ketimine is generally as follows: (1) a polyamine containing two secondary amine groups and more than one primary amine group is reacted with a low molecular weight ketone such as H2N (CH2) 3NHCHzCH2NH (CH2) 3NH2 polyamine, with methyl isobutyl ketone closed, can be prepared from a chelate ketone imine. This ketimine is mixed with bisphenol A epoxy resin to produce a single packaged epoxy adhesive under anhydrous conditions.
In a humid environment, this adhesive can be better cross-linked. (2) directly with polyamines, ketones and epoxy resin mixed to form a single package of epoxy adhesive (must avoid contact with water, wet steam). For example, 16 parts of diethylenetriamine, 49 parts of Epikote 1001 epoxy resin, 30 parts of methyl isobutyl ketone, 30 parts of butanone and 50 parts of toluene can be used as a coating which can be stably stored at room temperature.
This coating is coated on the steel plate, after 3d cross-linking, can form a high peel strength of the coating. (3) the use of fatty polyamines and hindered ketones (that is, ketone groups on both sides of a carbon group with more carbon atoms, such as methyl isobutyl ketone) reaction, preparation of imidazoline group containing ketimine compounds. The ketone imine can be dispersed in an aqueous solution by means of a solvating aid such as acetic acid to form an amine-based amine crosslinking agent for the production of water-soluble epoxy coatings and electrophoretic varnishes.
The basic method for preparing ketimine is to dissolve the ketone and the polyamine in a solvent such as benzene or cyclohexane, add an acidic catalyst (dehydrating agent, preferably a strong acid cation exchange resin), heating (70 to 100 Lt; 0 & gt; C), the water produced in the reaction is continuously removed by azeotropy, and then the solvent is removed by vacuum distillation to produce ketimine, and the product is stored in a sealed refrigerator.
For example, 47.7 g of diethylenetriamine, 99.5 g of methyl isobutyl ketone, 0.25 g of Dodeex 50w-x8 type ion exchange resin and sufficient benzene were added to a 2 L reaction flask to bring the total volume of the reactants to 750 mL, (16.6 g), and then the solvent was removed by means of a rotary vacuum evaporator to produce ketimine, and the product was stored in a brown bottle.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
If the polyamine crosslinker contains a secondary amine group, the ketamine can react with the epoxy resin after ketoimidation, so the period of use is very short; if the ketone is imidized and then the phenyl group Glycidyl ether will also be closed, these ketimines are relatively stable to use, in the absorption of water began to occur after the rapid cross-linking effect. Ketone imide crosslinker has a certain latent, the use of ingredients is relatively long (greater than 8h), cross-linking agent viscosity is low, the color is relatively shallow, cross-linked properties better than polyamines. In order to accelerate the crosslinking reaction, usually from 0.5% to 2% of the water to promote the cross-linking reaction.
Condensation of Polyamine Crosslinker with Thiourea. This adduct can be used for low temperature crosslinking agent, suitable for winter field construction.
The reaction of polyamine crosslinking agent with organic acid. The resulting low molecular weight polyamide resin (also known as polyamino amide) is the largest amount of modified amine. The carboxylic acid used in the reaction may be a dimer acid or a common saturated or unsaturated fatty acid with a long chain fatty acid.
Dicyandiamide is one of the most commonly used latent cross-linking agent, but the high cross-linking temperature, solubility in the epoxy resin is not good, is not conducive to wet molding.
With the modification of aniline-formaldehyde, the modified dicyandiamide can be dissolved in the mixed solvent of acetone and alcohol, and under the action of acrylic acid passivated imidazole, the resin can be crosslinked at 125 ℃, The product has good room temperature performance and wet heat performance.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
If the polyamine crosslinker contains a secondary amine group, the ketamine can react with the epoxy resin after ketoimidation, so the period of use is very short; if the ketone is imidized and then the phenyl group Glycidyl ether will also be closed, these ketimines are relatively stable to use, in the absorption of water began to occur after the rapid cross-linking effect. Ketone imide crosslinker has a certain latent, the use of ingredients is relatively long (greater than 8h), cross-linking agent viscosity is low, the color is relatively shallow, cross-linked properties better than polyamines. In order to accelerate the crosslinking reaction, usually from 0.5% to 2% of the water to promote the cross-linking reaction.
Condensation of Polyamine Crosslinker with Thiourea. This adduct can be used for low temperature crosslinking agent, suitable for winter field construction.
The reaction of polyamine crosslinking agent with organic acid. The resulting low molecular weight polyamide resin (also known as polyamino amide) is the largest amount of modified amine. The carboxylic acid used in the reaction may be a dimer acid or a common saturated or unsaturated fatty acid with a long chain fatty acid.
Dicyandiamide is one of the most commonly used latent cross-linking agent, but the high cross-linking temperature, solubility in the epoxy resin is not good, is not conducive to wet molding.
With the modification of aniline-formaldehyde, the modified dicyandiamide can be dissolved in the mixed solvent of acetone and alcohol, and under the action of acrylic acid passivated imidazole, the resin can be crosslinked at 125 ℃, The product has good room temperature performance and wet heat performance.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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