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High-fluidity and low-temperature toughness modified polycarbonate and preparation method thereof

A polycarbonate and low-temperature toughness technology, which is applied in the field of modified polycarbonate with high fluidity and low-temperature toughness and its preparation, can solve the problem of reducing PC processing fluidity, poor processing fluidity, and difficulty in processing thin-walled products. needs and other issues to achieve the effects of good processing fluidity, improved notched impact strength, and good low temperature toughness

Active Publication Date: 2016-05-04
铨盛聚碳科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the Chinese invention patent application CN103421293A adopts the method of adding an organosilicon-polycarbonate copolymer with a core-shell structure to improve the low-temperature toughness of PC, but this method makes the processing fluidity of PC worse, and the obtained PC is difficult to meet the requirements of thin-walled products. processing needs
[0003] In summary, the existing technology can improve the low-temperature toughness of PC by adding elastomers, but at the same time, it will reduce the processing fluidity of PC. There is an urgent need in this field for a modification technology that can simultaneously improve the fluidity and low-temperature toughness of PC.

Method used

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  • High-fluidity and low-temperature toughness modified polycarbonate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Dissolve 0.1g KOH in 20g deionized water, and then evenly spray it in 978.9g PC (brand L-1250Y); put the PC pellets in an oven and dry at 90°C for 3 hours, and the measured moisture content is 0.4% , added to the twin-screw extruder to melt and extrude to obtain hydroxyl-terminated PC; the temperature of each section of the twin-screw extruder is: Zone 1: 200°C, Zone 2: 230°C, Zone 3: 250°C, Zone 4: 270°C , Zone 5: 270°C, Zone 6: 270°C, Zone 7: 270°C, Zone 8: 270°C, Zone 9: 260°C, Zone 10: 260°C, Head: 250°C, Screw speed: 180r / min, Feeding speed: 25r / min;

[0029] (2) After the obtained hydroxyl-terminated PC is fully dried, add 20g of isocyanate group-terminated dimethylsiloxane (Si-OCN1) and 1g of antioxidant 1076, mix them evenly and add them into a twin-screw extruder to extrude After drying, the modified polycarbonate with high fluidity and low temperature toughness can be obtained; the temperature of each section of the extruder is: zone 1: 190°C, zone 2: 230...

Embodiment 2

[0031] (1) Dissolve 0.5g NaOH in 20g deionized water, and then evenly spray it in 894.5g PC (brand L-1250Y), put the PC pellets in an oven and dry at 95°C for 2 hours, and the measured moisture content is 0.35% , added to the twin-screw extruder to melt and extrude to obtain hydroxyl-terminated PC; the temperature of each section of the twin-screw extruder is: Zone 1: 220°C, Zone 2: 240°C, Zone 3: 260°C, Zone 4: 270°C , Zone 5: 270°C, Zone 6: 270°C, Zone 7: 270°C, Zone 8: 270°C, Zone 9: 260°C, Zone 10: 260°C, Head: 260°C, Screw speed: 180r / min, Feeding speed: 25r / min;

[0032](2) Fully dry the obtained hydroxyl-terminated PC, add 100g of isocyanate group-terminated dimethylsiloxane (Si-OCN2) and 5g of antioxidant 1076, mix well and add to a twin-screw extruder to extrude and granulate After drying, the modified polycarbonate with high fluidity and low temperature toughness can be obtained; the temperature of each section of the extruder is: zone 1: 200°C, zone 2: 240°C, zone ...

Embodiment 3

[0034] (1) Dissolve 0.1g KOH in 20g deionized water, then evenly spray it in 898.9g PC (brand L-1250Y), put the PC pellets in an oven and dry at 92°C for 2 hours, and the measured moisture content is 0.45% , added to the twin-screw extruder to melt and extrude to obtain hydroxyl-terminated PC; the temperature of each section of the twin-screw extruder is: Zone 1: 210°C, Zone 2: 235°C, Zone 3: 255°C, Zone 4: 270°C , Zone 5: 270°C, Zone 6: 270°C, Zone 7: 270°C, Zone 8: 270°C, Zone 9: 260°C, Zone 10: 260°C, Head: 255°C, Screw speed: 180r / min, Feeding speed: 25r / min;

[0035] (2) Fully dry the obtained hydroxyl-terminated PC, add 100g of epoxy-terminated dimethylsiloxane (the brand is CG-276) and 1g of antioxidant 168, mix well and then add it to a twin-screw extruder to extrude After granulation and drying, the modified polycarbonate with high fluidity and low temperature toughness can be obtained; the temperature of each section of the extruder is: zone 1: 210°C, zone 2: 235°C,...

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Abstract

The invention discloses high-fluidity and low-temperature toughness modified polycarbonate and a preparation method thereof. The raw material formula consists of the following components in percentage by mass: 89.45-97.89% of bisphenol A polycarbonate, 2-10% of reactive polydimethylsiloxane, 0.1-0.5% of antioxidant and 0.01-0.05% of catalyst. According to the invention, the melt flow rate of the modified polycarbonate is improved by 50% or over based on the raw material bisphenol A polycarbonate and a carbonate-organic silicon copolymer, and the notch impact strength at a low temperature of -40 DEG C is enhanced by about 4 times; and the obtained modified polycarbonate has low-temperature toughness as well as good processing fluidity. The improvement of fluidity and low-temperature toughness of bisphenol A polycarbonate is realized by a secondary melt extrusion method of a twin-screw extruder, the method is simple, and industrialization is easy to implement.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a modified polycarbonate with high fluidity and low-temperature toughness and a preparation method thereof. technical background [0002] Bisphenol A polycarbonate (Polycarbonate, referred to as PC) is a thermoplastic resin containing carbonate groups in its molecular chain. It has excellent electrical insulation, impact performance, dimensional stability and heat resistance. The fastest growing general-purpose engineering plastic among plastics. However, unmodified PC still has deficiencies, which are manifested in poor processing fluidity and low temperature toughness. In the existing technology, the low-temperature toughness of PC can be increased to a certain extent by adding elastomers, and the problems of notch sensitivity and stress cracking can be solved, but the addition of elastomers will inevitably reduce the processing fluidity of PC, which restricts its thin-walled ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G64/18C08L87/00
CPCC08G64/186C08G81/00C08L87/00
Inventor 王启瑶朱亚明
Owner 铨盛聚碳科技股份有限公司