News Details
Different crosslinking agent - NCO content of coatings
2017-3-9 16:06:21
Different crosslinking agent - NCO content of coatings, the aliphatic isocyanate synthesis different - NCO content of crosslinking agent from the tensile strength of the coating increased with the increase of - NCO content, the elongation at break reduced gradually with the increase of - NCO content.
This is because with the increase of - NCO content, coating the hard segment content increasing, the formation of micro crystal area, the more so the tensile strength and hardness increase; As the coating of microcrystalline area is becoming more and more in the period of relative movement between the molecular chain stretching with is becoming more and more difficult, so the elongation at break decreased with increasing - NCO content.
Comparing HDI IPDI, HMDI three aliphatic isocyanate, because HDI is linear structure, coating is not easy to form microcrystalline area, soft film as a whole, the tensile strength and elongation at break are lower; IPDI and HMDI have a ring structure, its tensile strength is higher, while the HMDI molecule contains two rings, IPDI molecules containing a circular structure, so the HMDI synthesis of coating the highest tensile strength, the double loop structure is larger than that of IPDI instead the HMDI single loop structure strong rigidity, so the HMDI synthesis coating elongation at break below the IPDI composite coating.
Polyether polyol on the properties of coating. Choose different polyether polyols, GMN, GE GE - 210-210-3050, GEP - 330 n and IPDI synthesis different - NCO content of crosslinking agent, and then mixed with paint components preparation of coating, respectively, for coating curing matures, test the tensile strength and elongation at break of film.
Using different polyether alcohol and IPDI diversity synthesis - NCO content of crosslinking agent, the tensile strength of the coating obtained with the increase of the - NCO content increased, while the elongation at break reduced gradually with the increase of - NCO content.
Comparing the four kinds of polyether polyols, under the condition of the same - NCO content, the polyether polyols GE - 210 film tensile strength and elongation at break of the lowest; Polyether polyols and GEP GMN - 3050-3050 n film tensile strength and elongation at break of center; Polyether polyol of GE - 220 coating has the highest tensile strength and elongation at break.
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).
This is because the GE - 220 of difunctional degrees of medium molecular weight polyether polyol, chain in the formation of the coating is neat, is beneficial to form more microcrystalline area, so the highest tensile strength, the film and stretch, its molecular chain is linear, so the flexibility of the coating is better also, elongation at break is highest; GE - 210 molecular chain is shorter, the coating elastic is not large enough to lead to the tensile strength and elongation at break are lower; And GEP GMN - 3050-330 n for the three faculties big molecular weight polyether polyol, the preparation of the crosslinking density of coating is higher, so its elongation at break and tensile strength is lower than the GE - 220.
Polyether polytetrahydrofuran are diverse and polyol synthesis of crosslinking agent on the properties of coating. Selection of polyether polyols, GE GE - 210-220, and with the same molecular weight of polyols polytetrahydrofuran PTMG1000 and PTMG2000 and IPDI synthesis different - NCO content of crosslinking agent, mixing respectively with paint components preparation of coating, coating curing matures, test the tensile strength and elongation at break of film.
Used with the same molecular weight of polyols polytetrahydrofuran than the preparation of polyether polyols is the tensile strength of the coating is higher, but the elongation at break.
This is because the polyol polytetrahydrofuran bond energy is higher in molecular chain of C - C key content is higher, and the flexibility good C, O, C key content is less than that of polyether polyols, so under the same relative molecular mass, the polyols preparation of polytetrahydrofuran film tensile strength, and elongation at break.
Homemade elastic mixture of crosslinking agent and rigid crosslinking agent on the properties of coating. The self-made elastic crosslinking agent with bayer (Germany) N75 and N3390 crosslinking agent in different match compete with, then respectively with mixed preparation of coating of paint component, for coating curing matures, test the tensile strength and elongation at break of film.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
This is because with the increase of - NCO content, coating the hard segment content increasing, the formation of micro crystal area, the more so the tensile strength and hardness increase; As the coating of microcrystalline area is becoming more and more in the period of relative movement between the molecular chain stretching with is becoming more and more difficult, so the elongation at break decreased with increasing - NCO content.
Comparing HDI IPDI, HMDI three aliphatic isocyanate, because HDI is linear structure, coating is not easy to form microcrystalline area, soft film as a whole, the tensile strength and elongation at break are lower; IPDI and HMDI have a ring structure, its tensile strength is higher, while the HMDI molecule contains two rings, IPDI molecules containing a circular structure, so the HMDI synthesis of coating the highest tensile strength, the double loop structure is larger than that of IPDI instead the HMDI single loop structure strong rigidity, so the HMDI synthesis coating elongation at break below the IPDI composite coating.
Polyether polyol on the properties of coating. Choose different polyether polyols, GMN, GE GE - 210-210-3050, GEP - 330 n and IPDI synthesis different - NCO content of crosslinking agent, and then mixed with paint components preparation of coating, respectively, for coating curing matures, test the tensile strength and elongation at break of film.
Using different polyether alcohol and IPDI diversity synthesis - NCO content of crosslinking agent, the tensile strength of the coating obtained with the increase of the - NCO content increased, while the elongation at break reduced gradually with the increase of - NCO content.
Comparing the four kinds of polyether polyols, under the condition of the same - NCO content, the polyether polyols GE - 210 film tensile strength and elongation at break of the lowest; Polyether polyols and GEP GMN - 3050-3050 n film tensile strength and elongation at break of center; Polyether polyol of GE - 220 coating has the highest tensile strength and elongation at break.
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).
This is because the GE - 220 of difunctional degrees of medium molecular weight polyether polyol, chain in the formation of the coating is neat, is beneficial to form more microcrystalline area, so the highest tensile strength, the film and stretch, its molecular chain is linear, so the flexibility of the coating is better also, elongation at break is highest; GE - 210 molecular chain is shorter, the coating elastic is not large enough to lead to the tensile strength and elongation at break are lower; And GEP GMN - 3050-330 n for the three faculties big molecular weight polyether polyol, the preparation of the crosslinking density of coating is higher, so its elongation at break and tensile strength is lower than the GE - 220.
Polyether polytetrahydrofuran are diverse and polyol synthesis of crosslinking agent on the properties of coating. Selection of polyether polyols, GE GE - 210-220, and with the same molecular weight of polyols polytetrahydrofuran PTMG1000 and PTMG2000 and IPDI synthesis different - NCO content of crosslinking agent, mixing respectively with paint components preparation of coating, coating curing matures, test the tensile strength and elongation at break of film.
Used with the same molecular weight of polyols polytetrahydrofuran than the preparation of polyether polyols is the tensile strength of the coating is higher, but the elongation at break.
This is because the polyol polytetrahydrofuran bond energy is higher in molecular chain of C - C key content is higher, and the flexibility good C, O, C key content is less than that of polyether polyols, so under the same relative molecular mass, the polyols preparation of polytetrahydrofuran film tensile strength, and elongation at break.
Homemade elastic mixture of crosslinking agent and rigid crosslinking agent on the properties of coating. The self-made elastic crosslinking agent with bayer (Germany) N75 and N3390 crosslinking agent in different match compete with, then respectively with mixed preparation of coating of paint component, for coating curing matures, test the tensile strength and elongation at break of film.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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