News Details
Low temperature curing crosslinking agent of polyester powder coating
2017-3-18 17:37:34
Low temperature curing crosslinking agent of polyester powder coating,Using neopentyl glycol, terephthalic acid, adipic acid, tin acid and trimellitic anhydride developed is suitable for the beta? Hydroxyl alkyl amide (beta? HAA) system of crosslinked polyester resin at low temperature. By adopting the method of X-ray powder diffraction analysis of low temperature crosslinking polyester resin crystallinity, and making use of the Fourier transform infrared spectrometer characterization of molecular structure.
Preparation into the polyester resin powder coating, electrostatic spraying on the 6063 aluminum alloy by artificial uv accelerated aging test (QUV) examines the crosslinking temperature and the crosslinking time of the coating to protect the light rate (to reflect the weather resistance coating). Of powder coating under the condition of 160 ° C / 10 min after crosslinking, coating in the 1000 h after aging test of light at a rate of 93.6%, and the mechanical properties, resistance to acid salt fog corrosion, solvent resistance, resistance to hot and humid, etc are outstanding.
Thermosetting polyester powder coating has excellent outdoor performance and physical and mechanical performance, spraying process does not produce environmental pollution, environmental friendly, simple process, easy automation, the powder can be recycled, heavily is a kind of environment-friendly powder coatings, are widely used in metal coating.
At present, the commonly used thermosetting polyester powder coatings are three glycidyl ester isocyanate crosslinking agent [TGIC, scientific name for the three (2, 3 - epoxy propane) both triazine) 2 minus 2 (1 h, 3 h, 5 h) three ketone.
TGIC has strong excitant, toxicity, adverse to human body health, and polyester/TGIC system of crosslinking conditions demanding (crosslinking temperature > 200 ° C, crosslinking time 15 min), high crosslinking temperature consumes large amounts of heat energy, longer crosslinking time reduces the production efficiency, is not conducive to aluminum production to the change of the pattern of "saving energy and reducing consumption".
Therefore, the development of low temperature crosslinking powder coatings become the important topic of research at home and abroad. Today, especially in an increasingly tense energy supplies, countries all over the world especially in European countries to speed up the pace of the research, many new varieties of low temperature crosslinking powder coating. But low crosslinking temperature and shorter crosslinking time, affects the flow of coating property and produce pinhole, foaming, especially in the case of weatherability than traditional performance of the powder coating.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
This paper developed is suitable for the beta? Hydroxyl alkyl amide (beta? HAA) a new kind of polyester resin crosslinking agent and preparation into powder coating, tested the various properties of coating.
Experiment materials: neopentyl glycol, triphenyl phosphite, toluene, potassium hydroxide, acetone, ethanol, analysis of pure, characters; Terephthalic acid, analysis of TBT acid, pure, Aladdin. Adipic acid, analysis of pure; Trimellitic anhydride, analysis of pure; Beta? HAA crosslinking agent; Benzoin; Flow ping agent.
The synthesis of polyester resin.
Mainly choose highly symmetrical structure, and contains a certain rigid polyol/acid to synthesize some groups have a certain degree of crystallinity of polyester resin, namely using neopentyl glycol and terephthalic acid and adipic acid as a semi crystalline polyester monomer units, TBT acid as catalyst, trimellitic anhydride as acidifying agent.
To a certain amount of glycol, dibasic acid and catalyst in the reactor, stirring evenly. Recanalization in nitrogen, heats up to 220 ° C polycondensation reaction time, join the acidolysis agent to adjust acid value, and then pumping air into vacuum state, controlled polymerization end point, add antioxidant, cooling, acid value, viscosity conform to the requirements of the new type end carboxyl polyester resin.
Base material and its surface pretreatment. Base material is 6063 aluminum alloy. Pretreatment process for: defatted (alkaline degreaser, 50 ° C / 5 min) to water (pure water, 25 ° C), neutral (150 g/L HNO3, 25 ° C / 3 min) to water (pure water, 25 ° C), passivation [molybdenum into liquid (8 g/L ammonium molybdate, potassium permanganate, 7 g/L, sodium fluoride 1 g/L), 50 ° C / 10 min] to water (pure water, 25 ° C), dry (100 ° C / 20 min).
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Preparation into the polyester resin powder coating, electrostatic spraying on the 6063 aluminum alloy by artificial uv accelerated aging test (QUV) examines the crosslinking temperature and the crosslinking time of the coating to protect the light rate (to reflect the weather resistance coating). Of powder coating under the condition of 160 ° C / 10 min after crosslinking, coating in the 1000 h after aging test of light at a rate of 93.6%, and the mechanical properties, resistance to acid salt fog corrosion, solvent resistance, resistance to hot and humid, etc are outstanding.
Thermosetting polyester powder coating has excellent outdoor performance and physical and mechanical performance, spraying process does not produce environmental pollution, environmental friendly, simple process, easy automation, the powder can be recycled, heavily is a kind of environment-friendly powder coatings, are widely used in metal coating.
At present, the commonly used thermosetting polyester powder coatings are three glycidyl ester isocyanate crosslinking agent [TGIC, scientific name for the three (2, 3 - epoxy propane) both triazine) 2 minus 2 (1 h, 3 h, 5 h) three ketone.
TGIC has strong excitant, toxicity, adverse to human body health, and polyester/TGIC system of crosslinking conditions demanding (crosslinking temperature > 200 ° C, crosslinking time 15 min), high crosslinking temperature consumes large amounts of heat energy, longer crosslinking time reduces the production efficiency, is not conducive to aluminum production to the change of the pattern of "saving energy and reducing consumption".
Therefore, the development of low temperature crosslinking powder coatings become the important topic of research at home and abroad. Today, especially in an increasingly tense energy supplies, countries all over the world especially in European countries to speed up the pace of the research, many new varieties of low temperature crosslinking powder coating. But low crosslinking temperature and shorter crosslinking time, affects the flow of coating property and produce pinhole, foaming, especially in the case of weatherability than traditional performance of the powder coating.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
This paper developed is suitable for the beta? Hydroxyl alkyl amide (beta? HAA) a new kind of polyester resin crosslinking agent and preparation into powder coating, tested the various properties of coating.
Experiment materials: neopentyl glycol, triphenyl phosphite, toluene, potassium hydroxide, acetone, ethanol, analysis of pure, characters; Terephthalic acid, analysis of TBT acid, pure, Aladdin. Adipic acid, analysis of pure; Trimellitic anhydride, analysis of pure; Beta? HAA crosslinking agent; Benzoin; Flow ping agent.
The synthesis of polyester resin.
Mainly choose highly symmetrical structure, and contains a certain rigid polyol/acid to synthesize some groups have a certain degree of crystallinity of polyester resin, namely using neopentyl glycol and terephthalic acid and adipic acid as a semi crystalline polyester monomer units, TBT acid as catalyst, trimellitic anhydride as acidifying agent.
To a certain amount of glycol, dibasic acid and catalyst in the reactor, stirring evenly. Recanalization in nitrogen, heats up to 220 ° C polycondensation reaction time, join the acidolysis agent to adjust acid value, and then pumping air into vacuum state, controlled polymerization end point, add antioxidant, cooling, acid value, viscosity conform to the requirements of the new type end carboxyl polyester resin.
Base material and its surface pretreatment. Base material is 6063 aluminum alloy. Pretreatment process for: defatted (alkaline degreaser, 50 ° C / 5 min) to water (pure water, 25 ° C), neutral (150 g/L HNO3, 25 ° C / 3 min) to water (pure water, 25 ° C), passivation [molybdenum into liquid (8 g/L ammonium molybdate, potassium permanganate, 7 g/L, sodium fluoride 1 g/L), 50 ° C / 10 min] to water (pure water, 25 ° C), dry (100 ° C / 20 min).
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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