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High resistance paint crosslinking agent
2017-8-3 16:16:48
High resistance paint crosslinking agent
The influence of the dosage of polyol on coating properties. Elastic polyurethane molecular chain generally have "soft" and "hard segment" of hard and soft proportion and raw materials will directly influence the mechanical properties of elastic polyurethane coating, surface properties and the physical and chemical properties, etc.
In synthesis of elastic crosslinking agent, soft segment of raw materials mainly is linear with hydroxyl-terminated polyether and/or polyester, hard segment of raw materials mainly diisocyanate and small molecular polyol, including the dosage of the polyols to dry coating, had a greater influence on the mechanical properties, surface hardness, wear resistance, etc. In this paper, the effect of the dosage on the coating properties of polyols was investigated.
With the increase of dosage of TMP, hardness content in the coating system, on the one hand, the constrained flexible macromolecule free rotation, on the other hand due to intermolecular hydrogen bonding interaction to strengthen, promote the orientation and orderly arrangement of rigid chain segments, therefore, to improve the strength of the coating, surface hardness, wear resistance and the dosage of TMP is too much, coating brittleness increases, elongation at break decreased, will affect the abrasion resistance and adhesion. In combination, the dosage of polyols was determined to be about 12%.
Effect of fluorine resin on coating performance. Because of fluorine (F) has the highest electronegativity (4.0), the smaller atomic radius (0.135 nm), F - C key is key in all chemical bonds to the highest (485.6 KJ/mol, higher than that of uv energy), fluorine carbon coating on low surface energy (23 dyne/cm), small friction coefficient, sliding friction coefficient is 0.15 ~ 0.17) of the steel plate, as a result, coating containing fluorine carbon structure has long weathering resistance, abrasion resistance, excellent chemical resistance and self-cleaning function. In the process of film forming, the chemical stability of F - C key tend to enrichment to the coating surface, have played an important role solid barrier, thus protecting coating from exposure to ultraviolet light, heat and other medium, low surface energy has the better stain resistance and hydrophobic properties.
Chinese name: Diethyl toluene diamine(DETDA)
The influence of the dosage of polyol on coating properties. Elastic polyurethane molecular chain generally have "soft" and "hard segment" of hard and soft proportion and raw materials will directly influence the mechanical properties of elastic polyurethane coating, surface properties and the physical and chemical properties, etc.
In synthesis of elastic crosslinking agent, soft segment of raw materials mainly is linear with hydroxyl-terminated polyether and/or polyester, hard segment of raw materials mainly diisocyanate and small molecular polyol, including the dosage of the polyols to dry coating, had a greater influence on the mechanical properties, surface hardness, wear resistance, etc. In this paper, the effect of the dosage on the coating properties of polyols was investigated.
With the increase of dosage of TMP, hardness content in the coating system, on the one hand, the constrained flexible macromolecule free rotation, on the other hand due to intermolecular hydrogen bonding interaction to strengthen, promote the orientation and orderly arrangement of rigid chain segments, therefore, to improve the strength of the coating, surface hardness, wear resistance and the dosage of TMP is too much, coating brittleness increases, elongation at break decreased, will affect the abrasion resistance and adhesion. In combination, the dosage of polyols was determined to be about 12%.
Effect of fluorine resin on coating performance. Because of fluorine (F) has the highest electronegativity (4.0), the smaller atomic radius (0.135 nm), F - C key is key in all chemical bonds to the highest (485.6 KJ/mol, higher than that of uv energy), fluorine carbon coating on low surface energy (23 dyne/cm), small friction coefficient, sliding friction coefficient is 0.15 ~ 0.17) of the steel plate, as a result, coating containing fluorine carbon structure has long weathering resistance, abrasion resistance, excellent chemical resistance and self-cleaning function. In the process of film forming, the chemical stability of F - C key tend to enrichment to the coating surface, have played an important role solid barrier, thus protecting coating from exposure to ultraviolet light, heat and other medium, low surface energy has the better stain resistance and hydrophobic properties.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packingļ¼ 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).
Fluorine resin of low surface energy, however, are usually the compatibility with organic resin is poorer, therefore, we through the test, screening of the mixed capacitive relatively well, fluorine content is higher, low viscosity of fluorine RF - 101, by dosage test, the preparation of high weather resistance of crosslinking agent, with the traditional six methylene diisocyanate (HDI) trimer were compared.
The coating of high - resistant crosslinking agent is superior to the traditional HDI trimer crosslinking in weathering, mechanical properties, wear resistance, high temperature resistance and adhesion to composite materials. Found in the process of fluorine resin added amount, fluorine resin dosage exceeds 25%, high weather resistance of crosslinking agent and PE - 6 resin mixed capacitive drop, varnish coating appear hair mist phenomenon, the coating is dry, adhesion, and a greater influence on the mechanical properties.
N (-nco) : n (-oh) effects on mechanical properties of coatings. Two-component polyurethane coating is one of the manufacturing technology is to determine the appropriate n (NCO) : n (OH), according to the theoretical calculation, the set of n (NCO) : n (- OH) = 1, even if a - NCO group with a one-to-one correspondence groups - OH, fully reflect, to get the best quality of coating. But the actual situation should be determined according to the test results.
If n (-nco) : n (-oh) is too small, the NCO group is not enough to react with the -oh group, the membrane has low crosslinking density, the coating is soft, the tensile strength and elongation are not ideal. But, if the ratio of the amount of substance is too high, the redundant - NCO group will absorb the moisture in the air is converted to urea, although you can increase the crosslink density, improve the strength of coating, but also can make coating elasticity decreased, increased brittleness, impact resistance, poor condition of surface coating, a pinhole. After the test, the n (-nco) of the coating system was determined: n (-oh) was suitable for 1.2.
Hydrolysis resistance stability of the coating is one of the important methods of accelerated testing water resistance of the coating, polyester elastic polyurethane coating as a result of the existence of ester bond in the system, it is a bit poor water resistance, elasticity of polyester type and polyether type polyurethane coating, water resistance is 5 ~ 10 times [2], but the obvious advantages of polyester type weatherability. The hydrolysis stability of the elastic polyester polyurethane crosslinking agent in the study was compared.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Fluorine resin of low surface energy, however, are usually the compatibility with organic resin is poorer, therefore, we through the test, screening of the mixed capacitive relatively well, fluorine content is higher, low viscosity of fluorine RF - 101, by dosage test, the preparation of high weather resistance of crosslinking agent, with the traditional six methylene diisocyanate (HDI) trimer were compared.
The coating of high - resistant crosslinking agent is superior to the traditional HDI trimer crosslinking in weathering, mechanical properties, wear resistance, high temperature resistance and adhesion to composite materials. Found in the process of fluorine resin added amount, fluorine resin dosage exceeds 25%, high weather resistance of crosslinking agent and PE - 6 resin mixed capacitive drop, varnish coating appear hair mist phenomenon, the coating is dry, adhesion, and a greater influence on the mechanical properties.
N (-nco) : n (-oh) effects on mechanical properties of coatings. Two-component polyurethane coating is one of the manufacturing technology is to determine the appropriate n (NCO) : n (OH), according to the theoretical calculation, the set of n (NCO) : n (- OH) = 1, even if a - NCO group with a one-to-one correspondence groups - OH, fully reflect, to get the best quality of coating. But the actual situation should be determined according to the test results.
If n (-nco) : n (-oh) is too small, the NCO group is not enough to react with the -oh group, the membrane has low crosslinking density, the coating is soft, the tensile strength and elongation are not ideal. But, if the ratio of the amount of substance is too high, the redundant - NCO group will absorb the moisture in the air is converted to urea, although you can increase the crosslink density, improve the strength of coating, but also can make coating elasticity decreased, increased brittleness, impact resistance, poor condition of surface coating, a pinhole. After the test, the n (-nco) of the coating system was determined: n (-oh) was suitable for 1.2.
Hydrolysis resistance stability of the coating is one of the important methods of accelerated testing water resistance of the coating, polyester elastic polyurethane coating as a result of the existence of ester bond in the system, it is a bit poor water resistance, elasticity of polyester type and polyether type polyurethane coating, water resistance is 5 ~ 10 times [2], but the obvious advantages of polyester type weatherability. The hydrolysis stability of the elastic polyester polyurethane crosslinking agent in the study was compared.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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