News Details
Synthesis of low molecular weight polyamide resin coating crosslinking agent
2017-7-22 11:20:22
Synthesis of low molecular weight polyamide resin coating crosslinking agent
At present, the synthesis of low molecular weight polyamide resin cross-linking agent is mainly used in the following four kinds:
Synthesis of low molecular weight polyamide resin crosslinking agent (1) with dimer acid as raw material for synthesis. This is an early method, the use of dimer acid from linolenic acid, linoleic acid and other vegetable oil fatty acid as raw materials synthesis. Industrial application of dimer acid dimer fatty acid content of 70% to 80%, trimerization and tetramer fatty acids accounted for 15% to 25%, unreacted fatty acid monomer mass fraction below 1%.
Another component of raw materials mainly polyethylene polyamine, mainly ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylene pentamine and so on, and triethylene tetramine and tetraethylenetetramine as well. In order to adjust the viscosity of the product, often in the reaction by adding monomeric acid (mainly monocarboxylic acid and dicarboxylic acid), generally added monocarboxylic acid is conducive to reducing the viscosity, while adding dicarboxylic acid may increase the viscosity of the polymer The In order to protect the double bond in the dimer acid molecule from being oxidized, the reaction is usually carried out at a temperature of 150 ° C or higher due to the relatively low amide reaction temperature of the NH2 group and the carboxyl group. Under the protection of gas, with a vacuum or adding inert solvent azeotropic dehydration. Usually to react to achieve a certain amine value, viscosity value for the reaction end.
Synthesis of low molecular weight polyamide resin crosslinking agent (2) with alkyl - aryl polycarboxylate and organic polyamine reaction synthesis. It is made of cationic copolymerization with conjugated fatty acids and compounds such as styrene and vinyl toluene. The use of this polycarboxylate and organic polyamine synthesis of low molecular weight polyamide resin color is shallow, and due to the introduction of aromatic ring in the main chain to improve the cross-linking agent and epoxy resin miscibility, increased cross-linking Resin heat resistance.
Synthesis of low molecular weight polyamide resin crosslinking agent (3) with monomer monocarboxylic acid, dibasic acid and organic polyamine reaction synthesis. The carboxylic acid used may be a fatty acid or an alicyclic acid or an aromatic acid. Raw material ratio can be based on the desired product viscosity and amine value to choose. Because of this variety can be varied, but also because of the choice of organic polyamines are also varied, so this method can be synthesized to produce a variety of different structures of modified amine crosslinking agent.
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
At present, the synthesis of low molecular weight polyamide resin cross-linking agent is mainly used in the following four kinds:
Synthesis of low molecular weight polyamide resin crosslinking agent (1) with dimer acid as raw material for synthesis. This is an early method, the use of dimer acid from linolenic acid, linoleic acid and other vegetable oil fatty acid as raw materials synthesis. Industrial application of dimer acid dimer fatty acid content of 70% to 80%, trimerization and tetramer fatty acids accounted for 15% to 25%, unreacted fatty acid monomer mass fraction below 1%.
Another component of raw materials mainly polyethylene polyamine, mainly ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylene pentamine and so on, and triethylene tetramine and tetraethylenetetramine as well. In order to adjust the viscosity of the product, often in the reaction by adding monomeric acid (mainly monocarboxylic acid and dicarboxylic acid), generally added monocarboxylic acid is conducive to reducing the viscosity, while adding dicarboxylic acid may increase the viscosity of the polymer The In order to protect the double bond in the dimer acid molecule from being oxidized, the reaction is usually carried out at a temperature of 150 ° C or higher due to the relatively low amide reaction temperature of the NH2 group and the carboxyl group. Under the protection of gas, with a vacuum or adding inert solvent azeotropic dehydration. Usually to react to achieve a certain amine value, viscosity value for the reaction end.
Synthesis of low molecular weight polyamide resin crosslinking agent (2) with alkyl - aryl polycarboxylate and organic polyamine reaction synthesis. It is made of cationic copolymerization with conjugated fatty acids and compounds such as styrene and vinyl toluene. The use of this polycarboxylate and organic polyamine synthesis of low molecular weight polyamide resin color is shallow, and due to the introduction of aromatic ring in the main chain to improve the cross-linking agent and epoxy resin miscibility, increased cross-linking Resin heat resistance.
Synthesis of low molecular weight polyamide resin crosslinking agent (3) with monomer monocarboxylic acid, dibasic acid and organic polyamine reaction synthesis. The carboxylic acid used may be a fatty acid or an alicyclic acid or an aromatic acid. Raw material ratio can be based on the desired product viscosity and amine value to choose. Because of this variety can be varied, but also because of the choice of organic polyamines are also varied, so this method can be synthesized to produce a variety of different structures of modified amine crosslinking agent.
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
Synthesis of low molecular weight polyamide resin crosslinking agent (4) with organic acid ester and excess organic polyamine for amine hydrolysis reaction. Since the ester compound can be aminated to form an amide compound. Therefore, some vegetable oils (such as tung oil) can be used directly as synthetic raw materials, and polyamine reaction, synthesis of low molecular weight polyamide modified amine crosslinking agent.
We can understand that, according to the different ways of firing, unsaturated polyester resin crosslinking type can be three:
Thermal crosslinking: the external heating of the crosslinking agent to release free radicals, which lead to resin cross-linking process. (Also known as thermal initiation crosslinking)
Cold cross-linking: the process of crosslinking the resin by the addition of a promoter to release the free radicals at room temperature or at a low crosslinking temperature. (Also known as chemical decomposition triggering cross-linking)
Light cross-linking: by adding photosensitizer, with ultraviolet light as the energy, triggering resin crosslinking process. (Also known as photoinitiated crosslinking)
Cyclohexanone peroxide (a mixture of various hydroperoxides). Cyclohexanone is dissolved in dibutyl ester and becomes a 50% paste, called 1 # crosslinker. Dibenzoyl peroxide is dissolved in dibutyl ester to form a 50% paste, called 2 # crosslinking agent
Methyl ethyl ketone peroxide (MEKP) is a liquid cross-linking agent, usually dubbed the active ingredient of 50% dimethyl ester solution, is a commercially available 5 # cross-linking agent. In the active ingredient, the same is not a single compound, but a mixture of hydroperoxide in a variety of molecular structures.
These compounds have different activities, and the hydroperoxy group (-OOH) increases the activity, and the hydroxyl group (-OH) reduces the activity.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Synthesis of low molecular weight polyamide resin crosslinking agent (4) with organic acid ester and excess organic polyamine for amine hydrolysis reaction. Since the ester compound can be aminated to form an amide compound. Therefore, some vegetable oils (such as tung oil) can be used directly as synthetic raw materials, and polyamine reaction, synthesis of low molecular weight polyamide modified amine crosslinking agent.
We can understand that, according to the different ways of firing, unsaturated polyester resin crosslinking type can be three:
Thermal crosslinking: the external heating of the crosslinking agent to release free radicals, which lead to resin cross-linking process. (Also known as thermal initiation crosslinking)
Cold cross-linking: the process of crosslinking the resin by the addition of a promoter to release the free radicals at room temperature or at a low crosslinking temperature. (Also known as chemical decomposition triggering cross-linking)
Light cross-linking: by adding photosensitizer, with ultraviolet light as the energy, triggering resin crosslinking process. (Also known as photoinitiated crosslinking)
Cyclohexanone peroxide (a mixture of various hydroperoxides). Cyclohexanone is dissolved in dibutyl ester and becomes a 50% paste, called 1 # crosslinker. Dibenzoyl peroxide is dissolved in dibutyl ester to form a 50% paste, called 2 # crosslinking agent
Methyl ethyl ketone peroxide (MEKP) is a liquid cross-linking agent, usually dubbed the active ingredient of 50% dimethyl ester solution, is a commercially available 5 # cross-linking agent. In the active ingredient, the same is not a single compound, but a mixture of hydroperoxide in a variety of molecular structures.
These compounds have different activities, and the hydroperoxy group (-OOH) increases the activity, and the hydroxyl group (-OH) reduces the activity.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian