News Details
ADR chain extender chain extension method of PLA
2017-2-27 12:18:15
ADR chain extender chain extension method of PLA, there are two main types. After the first method is reactive extrusion processing chain extender, simple, is mainly used method; The second method is to carry on the chain extension reaction, reaction is difficult, because of the control variables is more, users are less.
ADR chain extender for the PLA's expanding chain method: 1, reactive extrusion extender chain
The reaction of the most commonly used infrastructure for the twin screw extruder.
This method is simple to use, do not need to completely dry, catalyst and process of pumping air into vacuum state, ADR chain extender can greatly improve the molecular weight and mechanical rheological properties; In the processing, reprocessing and recycling low grade materials, do not need to be solid phase polymerization can increase high value.
This method need to be aware of problems:
(1) before the processing of PLA resin to be dry, otherwise the extender chain effect will influence;
(2) before vacuum vent screw combination of focus is to make the chain extender (ADR) and the dispersive mixing, PLA don't
Looking for response, don't let the shear heat cause local overheating; And between natural vent to the nose mouth mould to make chain extender and PLA to fully reaction (ADR) and extender chain effect;
(3) solid ADR melting point temperature is between 120-140 ℃. To complete 99% of the reaction, and then 200 ℃ takes about 30 s.
So choose double screw extrusion machine should consider screw length to diameter ratio and the effect of screw rotation speed. When it is necessary to first glanced through calculation. Suggest screw length to diameter ratio L/D more than 36, it is best to use the L/D = it came, so that at lower temperature, higher yield (higher RPM) to acquire the best extender chain effect; If the screw length to diameter ratio is too small, is bound to improve the effect of extrusion temperature to ensure that the chain extension, possible consequences is the degradation of PLA;
(4) temperature setting should be in the PLA can be fully fused the premise condition and can perform a quick reaction (ADR), under this principle,
Temperature setting should take limit;
(5) don't add phosphite antioxidants such as 168 etc;
(6) in order to make the ADR uniform chain extender chain extension effect, suggest adding in the die head about net increase reflux;
(7) at low temperature, it is suggested that adding 150 PPM of zinc stearate.
ADR chain extender for the PLA's expanding chain method: 2, polymerization extender chain
This way of chain extender to use less, there is no successful experience and data, but the outlook is good. There used to be a manufacturer, and with little kettle, the PLA molecular weight increased from 14000 to 60000 above, the effect is very obvious. Our suggestion, if it is a two step, namely the lactide ring-opening polymerization to aggregate PLA, after completion of the polymerization should join chain extender for extender chain reaction? It is feasible in theory, but it is not successful experiment.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packing： 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).
ADR chain extender for the PLA's expanding chain method: test results
1, the formula
Zine Stearate, zinc Stearate
2, processing technology:
(1) the PLA plus chain extender and zinc stearate extrusion grain process
1), PLA with 70 degrees bake four hours
2), high speed mixer mixing
3), double screw extruder, Φ = 26 mm, the temperature of the L/D = 40, each area is: (feed zone and the die head) 150 ℃, 180 ℃, 200 ℃,
200 ℃, 200 ℃, 200 ℃, 200 ℃, 200 ℃, 195 ℃, 195 ℃; Pressure 36, 54% torque, feeding rate of 23 s
(2) pure PLA blown film process
1), PLA with 70 degrees bake four hours
2), the temperature of the district is: (feed zone and the die head) 180 ℃, 181 ℃, 180 ℃, 181 ℃, 180 ℃; Torque is 54%, the feeding speed
The rate of 49 s
(3) after joining chain extender PLA blown film process
1), PLA with 70 degrees bake four hours
2), the temperature of the district is: (feed zone and the die head) 210 ℃, 210 ℃, 210 ℃, 210 ℃, 210 ℃; Torque is 77%, the feeding speed
The rate of 49 s
3, test results:
(1) melt index test
Test conditions: 190 degrees, 2.16 kg Melt index melt index reduction percentage
(2) the tensile strength test
Stretch bending strength tensile fracture strength
4, summarize
Add a chain extender ADR - 4368 - C, melt index decreases.
Add a chain extender ADR - 4368 - C, the increase of the tensile yield strength.
Add a chain extender ADR - 4368 - C, the increase of the tensile fracture strength.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
ADR chain extender for the PLA's expanding chain method: 1, reactive extrusion extender chain
The reaction of the most commonly used infrastructure for the twin screw extruder.
This method is simple to use, do not need to completely dry, catalyst and process of pumping air into vacuum state, ADR chain extender can greatly improve the molecular weight and mechanical rheological properties; In the processing, reprocessing and recycling low grade materials, do not need to be solid phase polymerization can increase high value.
This method need to be aware of problems:
(1) before the processing of PLA resin to be dry, otherwise the extender chain effect will influence;
(2) before vacuum vent screw combination of focus is to make the chain extender (ADR) and the dispersive mixing, PLA don't
Looking for response, don't let the shear heat cause local overheating; And between natural vent to the nose mouth mould to make chain extender and PLA to fully reaction (ADR) and extender chain effect;
(3) solid ADR melting point temperature is between 120-140 ℃. To complete 99% of the reaction, and then 200 ℃ takes about 30 s.
So choose double screw extrusion machine should consider screw length to diameter ratio and the effect of screw rotation speed. When it is necessary to first glanced through calculation. Suggest screw length to diameter ratio L/D more than 36, it is best to use the L/D = it came, so that at lower temperature, higher yield (higher RPM) to acquire the best extender chain effect; If the screw length to diameter ratio is too small, is bound to improve the effect of extrusion temperature to ensure that the chain extension, possible consequences is the degradation of PLA;
(4) temperature setting should be in the PLA can be fully fused the premise condition and can perform a quick reaction (ADR), under this principle,
Temperature setting should take limit;
(5) don't add phosphite antioxidants such as 168 etc;
(6) in order to make the ADR uniform chain extender chain extension effect, suggest adding in the die head about net increase reflux;
(7) at low temperature, it is suggested that adding 150 PPM of zinc stearate.
ADR chain extender for the PLA's expanding chain method: 2, polymerization extender chain
This way of chain extender to use less, there is no successful experience and data, but the outlook is good. There used to be a manufacturer, and with little kettle, the PLA molecular weight increased from 14000 to 60000 above, the effect is very obvious. Our suggestion, if it is a two step, namely the lactide ring-opening polymerization to aggregate PLA, after completion of the polymerization should join chain extender for extender chain reaction? It is feasible in theory, but it is not successful experiment.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packing： 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).
ADR chain extender for the PLA's expanding chain method: test results
1, the formula
Zine Stearate, zinc Stearate
2, processing technology:
(1) the PLA plus chain extender and zinc stearate extrusion grain process
1), PLA with 70 degrees bake four hours
2), high speed mixer mixing
3), double screw extruder, Φ = 26 mm, the temperature of the L/D = 40, each area is: (feed zone and the die head) 150 ℃, 180 ℃, 200 ℃,
200 ℃, 200 ℃, 200 ℃, 200 ℃, 200 ℃, 195 ℃, 195 ℃; Pressure 36, 54% torque, feeding rate of 23 s
(2) pure PLA blown film process
1), PLA with 70 degrees bake four hours
2), the temperature of the district is: (feed zone and the die head) 180 ℃, 181 ℃, 180 ℃, 181 ℃, 180 ℃; Torque is 54%, the feeding speed
The rate of 49 s
(3) after joining chain extender PLA blown film process
1), PLA with 70 degrees bake four hours
2), the temperature of the district is: (feed zone and the die head) 210 ℃, 210 ℃, 210 ℃, 210 ℃, 210 ℃; Torque is 77%, the feeding speed
The rate of 49 s
3, test results:
(1) melt index test
Test conditions: 190 degrees, 2.16 kg Melt index melt index reduction percentage
(2) the tensile strength test
Stretch bending strength tensile fracture strength
4, summarize
Add a chain extender ADR - 4368 - C, melt index decreases.
Add a chain extender ADR - 4368 - C, the increase of the tensile yield strength.
Add a chain extender ADR - 4368 - C, the increase of the tensile fracture strength.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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