News Details
Polyacrylate paint crosslinking agent
2017-5-11 17:54:32
Polyacrylate paint crosslinking agent. In the preparation of PA, polydouble monomer is introduced to make the PA molecule branched and increase the crosslinking density. Commonly used more double bonds of the compounds with ethylene (meth) acrylate (EGDA), diethylene glycol (meth) acrylate (DEGDA) and trimethylolpropane (meth) acrylate (P T M T A), etc.
Carboxyl and epoxy. The addition of dihydroxymethylpropionic acid in the preparation of the PU moisture content causes a large number of free carboxyl groups in the molecule, which leads to the formation of the membrane tolerance.
Eliminating the large number of carboxyl groups in the molecules is the key to resolving water-resistant properties. Synthetic add type epoxy monomers, such as methyl acrylic glycidyl ether (GMA), can increase the PA and PU connection, with the evaporation of moisture in the process of film forming, epoxy react with carboxyl, makes the water resistance and solvent resistance are improved. The equation is:
The reaction of ketocarbonyl and acylhydrazine. Use of diacetone acrylamide (DAAM) and adipic acid hydrazide (ADH) in such compounds can occur under the condition of weak acid and weak base catalysis ketone carbonyl and hydrazine dehydration reaction of this nature, in the preparation of dispersion, diacetone acrylamide and other alkene monomer polymerization into large molecules, when film with moisture release further react with adipic acid hydrazide and crosslinking, can improve the water resistance and solvent resistance of the membrane.
This reaction can be done at room temperature, but the crosslinking reaction usually takes more than seven days. Similar to that of diacetone acrylamide and (meth) acrylic acid ethyl acetyl acetoxyl group, and adipic acid hydrazide similar with oxalic acid hydrazide, succinic acid hydrazide, etc.
Raw materials. Raw materials are used in the synthesis of polyester glycol, toluene diisocyanate (T D I), isophorone diisocyanate (IPDI), dihydroxy methyl acrylic acid, methyl methacrylate, butyl acrylate, triethylamine, TMP, hydroxyl ethyl methacrylate (H E M A), M A D E G D A, G, DAAM, ADH, ethylenediamine, reducing agent, solvent, catalyst and initiator, distilled water, etc., are all industrial-grade.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
Into three bottles of polyester diol, TMP, dihydroxy methyl propionic acid, etc., after the dehydration reaction with TDI and IPDI, solvent can be added to adjust viscosity, (75 ~ 82 ℃) under the reaction more than 3 h, to NCO e., reaching for the acceleration response, can be appropriately add catalyst.
The reaction meets the requirement to cool down, and in the case of triethylamine, stir and stir in the distilled water, the ethylene diamine expansion chain, the semi-transparent polyurethane dispersion. Adding polyurethane dispersions have been the initiator of the monomer mixture, heat and add reducing agent, to begin around 75 ℃ aggregation, pay attention to the temperature control, under 95 ℃ to basic zero free monomer polymerization. Control the pH of 7 ~ 9, filter PUA dispersion. PUA has a slightly less transparent liquid, less than 500 mPa s, and a solid content of 33%.
The effect of alpha. Alpha = NCO/OH, which is an important parameter in the synthesis of polyurethane. Alpha > 1, which means that there's an excess of NCO in the prepolymer. In the preparation of polyurethane water dispersion, because of dispersal, the diamines are commonly used to spread the chain and demand alpha > 1. The polyurethane prepolymer is dispersed into the water and two reagents are competing against each other, and one is the reaction of the NCO and the reamer. The other is the reaction of NCO and water.
Experiments show that when the alpha > 1.4, because the excess - NCO in pre polymers, generate urea reacted with water, cause the system temperature, uneven local reaction degree, and produce more CO2 overflow caused by reaction kettle, poor dispersion, dispersion particle coarsening, even just a soybean curd gel. TDI - NCO is more active and more prone to this phenomenon. The optimum alpha is 1.05 to 1.25, and IPDI is low in activity and alpha is higher.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Carboxyl and epoxy. The addition of dihydroxymethylpropionic acid in the preparation of the PU moisture content causes a large number of free carboxyl groups in the molecule, which leads to the formation of the membrane tolerance.
Eliminating the large number of carboxyl groups in the molecules is the key to resolving water-resistant properties. Synthetic add type epoxy monomers, such as methyl acrylic glycidyl ether (GMA), can increase the PA and PU connection, with the evaporation of moisture in the process of film forming, epoxy react with carboxyl, makes the water resistance and solvent resistance are improved. The equation is:
The reaction of ketocarbonyl and acylhydrazine. Use of diacetone acrylamide (DAAM) and adipic acid hydrazide (ADH) in such compounds can occur under the condition of weak acid and weak base catalysis ketone carbonyl and hydrazine dehydration reaction of this nature, in the preparation of dispersion, diacetone acrylamide and other alkene monomer polymerization into large molecules, when film with moisture release further react with adipic acid hydrazide and crosslinking, can improve the water resistance and solvent resistance of the membrane.
This reaction can be done at room temperature, but the crosslinking reaction usually takes more than seven days. Similar to that of diacetone acrylamide and (meth) acrylic acid ethyl acetyl acetoxyl group, and adipic acid hydrazide similar with oxalic acid hydrazide, succinic acid hydrazide, etc.
Raw materials. Raw materials are used in the synthesis of polyester glycol, toluene diisocyanate (T D I), isophorone diisocyanate (IPDI), dihydroxy methyl acrylic acid, methyl methacrylate, butyl acrylate, triethylamine, TMP, hydroxyl ethyl methacrylate (H E M A), M A D E G D A, G, DAAM, ADH, ethylenediamine, reducing agent, solvent, catalyst and initiator, distilled water, etc., are all industrial-grade.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
Into three bottles of polyester diol, TMP, dihydroxy methyl propionic acid, etc., after the dehydration reaction with TDI and IPDI, solvent can be added to adjust viscosity, (75 ~ 82 ℃) under the reaction more than 3 h, to NCO e., reaching for the acceleration response, can be appropriately add catalyst.
The reaction meets the requirement to cool down, and in the case of triethylamine, stir and stir in the distilled water, the ethylene diamine expansion chain, the semi-transparent polyurethane dispersion. Adding polyurethane dispersions have been the initiator of the monomer mixture, heat and add reducing agent, to begin around 75 ℃ aggregation, pay attention to the temperature control, under 95 ℃ to basic zero free monomer polymerization. Control the pH of 7 ~ 9, filter PUA dispersion. PUA has a slightly less transparent liquid, less than 500 mPa s, and a solid content of 33%.
The effect of alpha. Alpha = NCO/OH, which is an important parameter in the synthesis of polyurethane. Alpha > 1, which means that there's an excess of NCO in the prepolymer. In the preparation of polyurethane water dispersion, because of dispersal, the diamines are commonly used to spread the chain and demand alpha > 1. The polyurethane prepolymer is dispersed into the water and two reagents are competing against each other, and one is the reaction of the NCO and the reamer. The other is the reaction of NCO and water.
Experiments show that when the alpha > 1.4, because the excess - NCO in pre polymers, generate urea reacted with water, cause the system temperature, uneven local reaction degree, and produce more CO2 overflow caused by reaction kettle, poor dispersion, dispersion particle coarsening, even just a soybean curd gel. TDI - NCO is more active and more prone to this phenomenon. The optimum alpha is 1.05 to 1.25, and IPDI is low in activity and alpha is higher.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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