News Details
Polyester powder coating crosslinking agent
2017-5-6 11:51:13
Polyester powder coating crosslinking agent. As the world to develop in the direction of environmental protection industrial coatings, powder coatings as solvent-free, energy saving, pollution-free coatings, are increasingly brought to the attention of the countries all over the world.
Powder coating industry in China start to get rapid development since the 1980 s, at an annual rate of more than 80%, in the late 90 s has an average annual growth rate is about 20%, the production of powder coatings, 270000 t, 2002 more than the United States the world's first, in 2007, production and sales of powder coatings has been more than 600000 t.
Weather resistance type polyester powder coating has been widely used in outdoor weather the requirements of the facilities, such as aluminum construction, automobile, motorcycle and bicycle parts, garden metal furniture, highway guardrail, outdoor advertising and lighting, ceiling, etc. This kind of powder coating in our country accounts for 20% ~ 25% of the whole powder coating market, the growth rate is above average.
Acid solutions of different dose of the melt viscosity of the resin, adipic acid as acid solution agent to get the lowest melt viscosity of the resin, trimellitic anhydride have been the biggest melt viscosity. Polybasic acid as acid solution of different agent to join with the reactivity of the crosslinking agent is different also, isophthalic acid and adipic acid reaction time relatively modest, trimellitic anhydride quickly, terephthalic acid is too slow, and poor resistance to impact.
Raw material monomer structure on synthesis of polyester resin of weather resistance has a certain influence, such as beta - hydrogen ethylene glycol, trimethylolpropane, with long chain fatty acids such as adipic acid deviation, weatherability of alicyclic acid such as 1, 4 - the weatherability of CHDA than acid containing aromatic ring, such as PAT, PAI is better.
Terephthalic acid and phthalate between different structures, the symmetric structure determines the maximum absorption wavelength of terephthalic acid in 297 nm, and the maximum absorption wavelength of isophthalic acid is less than 290 nm, 300 nm uv light in sunlight is a major cause of coating pulverization.
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
Uv absorbers can prevent the coating from breaking down in direct sunlight. They absorb or convert the ultraviolet components of sunlight into harmless heat, thereby eliminating the damage of sunlight to the coating. Common uv absorbers have diphenylketone compounds and benzene and triazole compounds (such as Tinuvin 900). Zeren mentioned, such as a new kind of uv absorber (brand name "Tinuvin 405"), it is a kind of hydroxyphenyl triazine, because have lower melting point (77 ° C) and especially suitable for powder coating. It is larger than that of high melting point (141 ° C) benzotriazole is more likely to be squeezed out. This new type of uv absorbent another advantage is that it is partial blue, so the varnish coating on the bottom of the light color coating, he can early to minimize risk. Such auxiliaries are usually necessary in varnish.
Hindered amine light stabilizer is a kind of free agent capture agent, mainly including gung organism, imidazole, n alkane ketones miscellaneous naphthenic ketone derivatives, in the light of the polymer materials of this kind of compounds in oxidation by capturing, decomposition of hydrogen peroxide, quenching free radicals excited state energy to achieve prevent aging, commonly used in nonferrous system, such as Ciba - Gergy Tinuvin144 is this kind of material.
Normally, uv absorbent and hindered amine are used together, because of the synergy of both can provide such as anti gloss reduction for coating, prevent decomposition, peeling, prevent the better protection, such as color change to recommend the use of concentration: 1% to 1.5% of UVA, 0.5 2.0% of HALS (according to the basic material).
The most commonly used defoaming/degasifier is benzoic, and there is no consensus on the mechanism of degassing. Studies suggest that benzoin delayed crosslinking starting time of powder system, and at the same time reduce the melt viscosity of the system, but that's not it at all the main mechanism of degassing in the powder system. Study found that benzoin in baking disappear within 6 to 8 minutes after the beginning of the sublimation or escape oxide) (from the system, thus infer that because its escape provides the powder gas evolution of channel, so as to realize the degassing effect.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Powder coating industry in China start to get rapid development since the 1980 s, at an annual rate of more than 80%, in the late 90 s has an average annual growth rate is about 20%, the production of powder coatings, 270000 t, 2002 more than the United States the world's first, in 2007, production and sales of powder coatings has been more than 600000 t.
Weather resistance type polyester powder coating has been widely used in outdoor weather the requirements of the facilities, such as aluminum construction, automobile, motorcycle and bicycle parts, garden metal furniture, highway guardrail, outdoor advertising and lighting, ceiling, etc. This kind of powder coating in our country accounts for 20% ~ 25% of the whole powder coating market, the growth rate is above average.
Acid solutions of different dose of the melt viscosity of the resin, adipic acid as acid solution agent to get the lowest melt viscosity of the resin, trimellitic anhydride have been the biggest melt viscosity. Polybasic acid as acid solution of different agent to join with the reactivity of the crosslinking agent is different also, isophthalic acid and adipic acid reaction time relatively modest, trimellitic anhydride quickly, terephthalic acid is too slow, and poor resistance to impact.
Raw material monomer structure on synthesis of polyester resin of weather resistance has a certain influence, such as beta - hydrogen ethylene glycol, trimethylolpropane, with long chain fatty acids such as adipic acid deviation, weatherability of alicyclic acid such as 1, 4 - the weatherability of CHDA than acid containing aromatic ring, such as PAT, PAI is better.
Terephthalic acid and phthalate between different structures, the symmetric structure determines the maximum absorption wavelength of terephthalic acid in 297 nm, and the maximum absorption wavelength of isophthalic acid is less than 290 nm, 300 nm uv light in sunlight is a major cause of coating pulverization.
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
Uv absorbers can prevent the coating from breaking down in direct sunlight. They absorb or convert the ultraviolet components of sunlight into harmless heat, thereby eliminating the damage of sunlight to the coating. Common uv absorbers have diphenylketone compounds and benzene and triazole compounds (such as Tinuvin 900). Zeren mentioned, such as a new kind of uv absorber (brand name "Tinuvin 405"), it is a kind of hydroxyphenyl triazine, because have lower melting point (77 ° C) and especially suitable for powder coating. It is larger than that of high melting point (141 ° C) benzotriazole is more likely to be squeezed out. This new type of uv absorbent another advantage is that it is partial blue, so the varnish coating on the bottom of the light color coating, he can early to minimize risk. Such auxiliaries are usually necessary in varnish.
Hindered amine light stabilizer is a kind of free agent capture agent, mainly including gung organism, imidazole, n alkane ketones miscellaneous naphthenic ketone derivatives, in the light of the polymer materials of this kind of compounds in oxidation by capturing, decomposition of hydrogen peroxide, quenching free radicals excited state energy to achieve prevent aging, commonly used in nonferrous system, such as Ciba - Gergy Tinuvin144 is this kind of material.
Normally, uv absorbent and hindered amine are used together, because of the synergy of both can provide such as anti gloss reduction for coating, prevent decomposition, peeling, prevent the better protection, such as color change to recommend the use of concentration: 1% to 1.5% of UVA, 0.5 2.0% of HALS (according to the basic material).
The most commonly used defoaming/degasifier is benzoic, and there is no consensus on the mechanism of degassing. Studies suggest that benzoin delayed crosslinking starting time of powder system, and at the same time reduce the melt viscosity of the system, but that's not it at all the main mechanism of degassing in the powder system. Study found that benzoin in baking disappear within 6 to 8 minutes after the beginning of the sublimation or escape oxide) (from the system, thus infer that because its escape provides the powder gas evolution of channel, so as to realize the degassing effect.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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