News Details
The influence of chain extender for waterborne polyurethane emulsion
2017-2-27 12:18:19
The influence of chain extender for waterborne polyurethane emulsion, emulsion preparation. Will oligomer dihydroxy methyl propionic acid and dibasic alcohol containing four bottles of reflux pipe, mixer, mixing, vacuum, vacuum dehydration C = IJK, and filling)! Gas protection. Cooled to = $join 3 d/H, heat; = H reaction! L after cooling.
Control slow drop and chain extender, and keep reaction under G $MB $H! L. Join triethylamine N acetone solution, fast, add distilled water solution increases transparency, viscosity from large to small, decompression after solvent, emulsion was prepared with blue.
Latex film. Pour of emulsion on the glass plate membrane, tilt Angle, slow wind with a copper wire winding of glass rod, dried at room temperature in the oven again, and put it in the dryer, cooling down from the diaphragm dry membrane test to be analysed.
Analysis of the test. Observation is the determination of emulsion stability let stand at room temperature, no is statified phenomenon. Let stand stratification time as indicators for the determination of stability. Poor stability of the emulsion static layering time for a few days or even a few hours.
The bibulous rate of absorbing water membrane and weightlessness rate determination. Cut after weighing, membrane before and after soaking in the water, dry the surface of the water after weighing, press type calculation of water absorption, resin, acrylic water-based polymer materials, has been developed rapidly in recent years of water-based polymer materials. Many factors influence the properties of waterborne polyurethane emulsion.
For a long time, people will focus on the study of hydrophilic chain extender, have made different performance of waterborne polyurethane emulsion. And in the process of preparing anionic waterborne polyurethane emulsion, glycol or multiple amine low molecular chain extender is one of the important factors affecting polymer mechanical properties, the domestic research is less.
And abroad in recent years to study more on the multiple amine chain extender. This paper studies the glycol chain extender and chain extender agent for polyethylene tetrahydrofuran ether glycol type and adipic acid has the effect of glycol ester glycol type polyurethane emulsion, and create excellent comprehensive properties of aqueous polyurethane emulsion.
And the quantity of cyanate ester groups oligomer glycol and hydroxy volume ratio in the small molecule chain extender; Content of hydrophilic group # (cca) - 0 is hydrophilic group - 0 cca mass fraction of the whole system. By ethylene glycol diethylene glycol as chain extender and a microstrip can be obtained from blue white emulsion, and the emulsion stability is good.
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
Due to low molecular chain extender can secondary reaction with excessive isocyanate, generate carbamate or biuret structure of rigid chain segments, or polyester and polyether glycol glycol is the structure of polyurethane flexible chain segment (soft). So the addition of chain extender helps to form polyurethane hard segment structure, hard segment of the mechanical properties of the material is bigger contribution.
For chooses four different chain extender, due to the different structures, four kinds of chain extender and so has the different hard segment structure made of polyurethane.
Overall, both for C - BD and pu, CE in isocyanate index "and chain extender agent under the same conditions, due to join the glycol molecular chain is the shortest, so the whole system of the density of hard segment is larger, the mechanics properties of the coating is the highest. As chain extender molecular" atomic number increasing, the system of hard segment density is small, the tensile strength of the material also decreases.
Data show that, regardless of the type C - BD or CE type polyurethane, preparation of ethylene glycol as chain extender polyurethane coating has high tensile strength, but by diol as chain extender agent preparation of polyurethane coating on the mechanical strength of the lowest. At the same time, due to flexible chain is the shortest in the ethylene glycol, low elongation at break. In the same way as a result of the existence of ether bond, so a reduction compared with butyl glycol diethylene glycol material has higher elongation at break, and based on the flexible structure of diol chain, the longest of the elongation at break of pu should also be at the longest.
At first, with the continuous increase in the amount of chain extender, material of hydrophilicity is falling, falling the bibulous rate of membrane, and when the content of chain extender reaches a certain system of hydrogen bonding effects on the material increases, the hydrogen bonding of hydrophilic is better, so the bibulous rate of membrane with further increase of the content of chain extender.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Control slow drop and chain extender, and keep reaction under G $MB $H! L. Join triethylamine N acetone solution, fast, add distilled water solution increases transparency, viscosity from large to small, decompression after solvent, emulsion was prepared with blue.
Latex film. Pour of emulsion on the glass plate membrane, tilt Angle, slow wind with a copper wire winding of glass rod, dried at room temperature in the oven again, and put it in the dryer, cooling down from the diaphragm dry membrane test to be analysed.
Analysis of the test. Observation is the determination of emulsion stability let stand at room temperature, no is statified phenomenon. Let stand stratification time as indicators for the determination of stability. Poor stability of the emulsion static layering time for a few days or even a few hours.
The bibulous rate of absorbing water membrane and weightlessness rate determination. Cut after weighing, membrane before and after soaking in the water, dry the surface of the water after weighing, press type calculation of water absorption, resin, acrylic water-based polymer materials, has been developed rapidly in recent years of water-based polymer materials. Many factors influence the properties of waterborne polyurethane emulsion.
For a long time, people will focus on the study of hydrophilic chain extender, have made different performance of waterborne polyurethane emulsion. And in the process of preparing anionic waterborne polyurethane emulsion, glycol or multiple amine low molecular chain extender is one of the important factors affecting polymer mechanical properties, the domestic research is less.
And abroad in recent years to study more on the multiple amine chain extender. This paper studies the glycol chain extender and chain extender agent for polyethylene tetrahydrofuran ether glycol type and adipic acid has the effect of glycol ester glycol type polyurethane emulsion, and create excellent comprehensive properties of aqueous polyurethane emulsion.
And the quantity of cyanate ester groups oligomer glycol and hydroxy volume ratio in the small molecule chain extender; Content of hydrophilic group # (cca) - 0 is hydrophilic group - 0 cca mass fraction of the whole system. By ethylene glycol diethylene glycol as chain extender and a microstrip can be obtained from blue white emulsion, and the emulsion stability is good.
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
Due to low molecular chain extender can secondary reaction with excessive isocyanate, generate carbamate or biuret structure of rigid chain segments, or polyester and polyether glycol glycol is the structure of polyurethane flexible chain segment (soft). So the addition of chain extender helps to form polyurethane hard segment structure, hard segment of the mechanical properties of the material is bigger contribution.
For chooses four different chain extender, due to the different structures, four kinds of chain extender and so has the different hard segment structure made of polyurethane.
Overall, both for C - BD and pu, CE in isocyanate index "and chain extender agent under the same conditions, due to join the glycol molecular chain is the shortest, so the whole system of the density of hard segment is larger, the mechanics properties of the coating is the highest. As chain extender molecular" atomic number increasing, the system of hard segment density is small, the tensile strength of the material also decreases.
Data show that, regardless of the type C - BD or CE type polyurethane, preparation of ethylene glycol as chain extender polyurethane coating has high tensile strength, but by diol as chain extender agent preparation of polyurethane coating on the mechanical strength of the lowest. At the same time, due to flexible chain is the shortest in the ethylene glycol, low elongation at break. In the same way as a result of the existence of ether bond, so a reduction compared with butyl glycol diethylene glycol material has higher elongation at break, and based on the flexible structure of diol chain, the longest of the elongation at break of pu should also be at the longest.
At first, with the continuous increase in the amount of chain extender, material of hydrophilicity is falling, falling the bibulous rate of membrane, and when the content of chain extender reaches a certain system of hydrogen bonding effects on the material increases, the hydrogen bonding of hydrophilic is better, so the bibulous rate of membrane with further increase of the content of chain extender.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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