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Polyarylester-polydimethylsiloxane block copolymer modified polycarbonate and preparation method thereof

A polydimethylsiloxane and block copolymer technology, which is applied in the field of polyarylate-polydimethylsiloxane block copolymer modified polycarbonate and its preparation, can solve the problem of polycarbonate processing Reduced fluidity and other problems, to achieve good mechanical properties, excellent heat resistance and rigidity, and good lubricity

Active Publication Date: 2016-07-27
铨盛聚碳科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In summary, the existing technology can improve the low-temperature toughness of polycarbonate by adding elastomers and other methods, but at the same time it will cause problems such as reduced processing fluidity of polycarbonate. There is an urgent need in this field to improve the fluidity of polycarbonate at the same time. Modification technology with low temperature toughness and maintaining its mechanical strength and service temperature

Method used

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  • Polyarylester-polydimethylsiloxane block copolymer modified polycarbonate and preparation method thereof

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Embodiment 1

[0029] The preparation method of polyarylate-polydimethylsiloxane block copolymer: add 3.75mmol bisphenol A, 7.5mmol sodium hydroxide, and 5.0g deionized water into a three-necked flask equipped with mechanical stirring in sequence, and wait for two After phenol A is completely dissolved, add 0.035mmol benzyltriethylammonium chloride to form the aqueous phase; dissolve 4.2mmol isophthaloyl chloride in 20.0g dry dichloromethane to form the organic phase; The phase was slowly added dropwise into the water phase, and the dropping time was controlled to be 8 minutes. After the dropwise addition was completed, the reaction was stirred at 5°C for 60 minutes, the ice bath was removed, and 0.75mmol sodium hydroxide and 0.375mmol average Double-terminated amino polydimethylsiloxane with a molecular weight of 27000, reacted at room temperature for 5 hours to obtain a polyarylate-polydimethylsiloxane block copolymer emulsion; pour the emulsion into a separatory funnel, add The amount of ...

Embodiment 2

[0032]The preparation method of polyarylate-polydimethylsiloxane block copolymer: add 7.5mmol bisphenol A, 15.8mmol sodium hydroxide, and 16.0g deionized water into a three-necked flask equipped with mechanical stirring in sequence, and wait for two After phenol A is completely dissolved, add 0.080mmol benzyltriethylammonium chloride to form an aqueous phase; dissolve 7.95mmol isophthaloyl chloride in 30.0g dry dichloromethane to form an organic phase; phase was slowly added dropwise into the water phase, and the dropping time was controlled to be 15 minutes. After the dropping was completed, the reaction was stirred at 10°C for 40 minutes, and the ice bath was removed, and 1.76mmol sodium hydroxide and 0.84mmol average Double-terminated amino polydimethylsiloxane with a molecular weight of 27000, reacted at room temperature for 6 hours to obtain a polyarylate-polydimethylsiloxane block copolymer emulsion; pour the emulsion into a separatory funnel, add Deionized water, the am...

Embodiment 3

[0035] After mixing 947g polycarbonate, 50g polyarylate-polydimethylsiloxane block copolymer (PARSi2.7W-2) and 3g antioxidant 1098 in a high-speed mixer, pass through a twin-screw extruder Melt, knead, extrude, cool, pelletize and dry to obtain polyarylate-polydimethylsiloxane block copolymer modified polycarbonate pellets. The temperature of the extruder is set as: Zone 1 : 215°C, Zone 2 240°C, Zone 3-9: 260°C, Head: 260°C; Screw speed: 120r / min.

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Abstract

The invention discloses polyarylester-polydimethylsiloxane block copolymer modified polycarbonate and a preparation method thereof. A raw material formula of polycarbonate comprises components in percentage by mass as follows: 91.6%-97.8% of bisphenol A type polycarbonate, 2%-8% of a polyarylester-polydimethylsiloxane block copolymer and 0.2%-0.4% of an antioxidant. The preparation method of the polyarylester-polydimethylsiloxane block copolymer comprises steps as follows: bisphenol A, sodium hydroxide and deionized water are mixed and dissolved, benzyl triethyl ammonium chloride is added, and an aqueous phase is formed; isophthaloyl dichloride is dissolved in dried dichloromethane, and an organic phase is formed; the organic phase is dropwise added to the aqueous phase, the temperature is reduced to 5-10 DEG C, the stirring reaction is performed, sodium hydroxide and amino-terminated polydimethylsiloxane are added, the normal-temperature reaction is performed, and a polyarylester-polydimethylsiloxane block copolymer emulsion is obtained. The prepared polycarbonate is good in low-temperature toughness and high in melt fluidity.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polyarylate-polydimethylsiloxane block copolymer modified polycarbonate and a preparation method thereof. Background technique [0002] Bisphenol A polycarbonate (referred to as polycarbonate, PC) is one of the five major engineering plastics. It has the advantages of high service temperature and good mechanical strength, but its melt viscosity is high, its processing fluidity is poor, and its low temperature toughness is poor. This severely limits its application. The low-temperature toughness of polycarbonate can be improved by adding thermoplastic elastomer and core-shell structure toughening agent. Chinese invention patent CN1388178A uses 10% polyolefin elastomer to toughen polycarbonate, so that the notched impact strength at -30°C reaches 464J / m, but it also causes the tensile strength of polycarbonate to drop from 58MPa to 43MPa, a reduction of 25...

Claims

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Application Information

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IPC IPC(8): C08L69/00C08L83/10C08K5/134C08K5/526C08K5/20C08G77/445
CPCC08G77/445C08L69/00C08L2201/08C08L83/10C08K5/1345C08K5/526C08K5/20
Inventor 王启瑶朱亚明
Owner 铨盛聚碳科技股份有限公司
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