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A method for improving polylactic acid/polyether ester block copolymer extrusion and improving impact resistance

A block copolymer and impact resistance technology, which is applied in the technical field of polymer materials, can solve the problems of high brittleness of polylactic acid, and achieve the effect of improving toughness and improving toughness.

Inactive Publication Date: 2015-12-23
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an improved polylactic acid / polyether ester block copolymer copolymerization method for the shortcomings of existing polylactic acid / polyether ester block copolymer extrusion blending and the shortcoming of polylactic acid brittleness. Mixture extrusion and method for improving impact resistance of polylactic acid, thereby preparing polylactic acid / polyether ester block copolymer blend with high toughness

Method used

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  • A method for improving polylactic acid/polyether ester block copolymer extrusion and improving impact resistance
  • A method for improving polylactic acid/polyether ester block copolymer extrusion and improving impact resistance

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Embodiment 1

[0015] The PLA homopolymers are 2002D and 4032D (Natureworks Company), and the weight average molecular weight of the PLA homopolymers is 200,000; the polyether ester block copolymer is provided by Sichuan Chenguang Plastic Co., Ltd.

[0016] In percent by weight, 90 parts of PLA homopolymers, 10 parts of polyether ester block copolymers, 2 parts of maleic anhydride and 0.35 parts of benzoyl peroxide are mixed uniformly to obtain a mixture, and then the mixture is mixed with two The screw extruder performs melt reaction blending at a temperature of 180-200°C to obtain a reaction blend of PLA and TPEE grafted with maleic anhydride; the mechanical properties of the obtained PLA / MAH / TPEE reaction blend are shown in figure 1 shown.

Embodiment 2

[0018] The PLA homopolymers are 2002D and 4032D (Natureworks Company), and the weight average molecular weight of the PLA homopolymers is 200,000; the polyether ester block copolymer is provided by Sichuan Chenguang Plastic Co., Ltd.

[0019] In percent by weight, 80 parts of PLA homopolymers, 20 parts of polyether ester block copolymers, 2 parts of maleic anhydride and 0.35 parts of benzoyl peroxide are mixed uniformly to obtain a mixture, and then the mixture is mixed with two The screw extruder performs melt reaction blending at a temperature of 180-200°C to obtain a reaction blend of PLA and TPEE grafted with maleic anhydride; the mechanical properties of the obtained PLA / MAH / TPEE reaction blend are shown in figure 1 shown.

Embodiment 3

[0021] The PLA homopolymers are 2002D and 4032D (Natureworks Company), and the weight average molecular weight of the PLA homopolymers is 200,000; the polyether ester block copolymer is provided by Sichuan Chenguang Plastic Co., Ltd.

[0022] In percent by weight, 70 parts of PLA homopolymers, 30 parts of polyether ester block copolymers, 2 parts of maleic anhydride and 0.35 parts of benzoyl peroxide are mixed uniformly to obtain a mixture, and then the mixture is mixed with two The screw extruder performs melt reaction blending at a temperature of 180-200°C to obtain a reaction blend of PLA and TPEE grafted with maleic anhydride; the mechanical properties of the obtained PLA / MAH / TPEE reaction blend are shown in figure 1 shown.

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Abstract

The invention relates to a method for enabling a blended thermoplastic polyeher ester elastomer (TPEE) and polylactic acid (PLA) to be easily extruded or blended and improving shock resistance through reaction processing. The invention discloses a method for improving extrusion of polylactic acid / polyether ester segmented copolymers and shock resistance. The method comprises the following steps: at first, uniformly mixing 70-100 wt% of polylactic acid homopolymer, 0-30 wt% of polyether ester segmented copolymer, 2 wt% of maleic anhydride, and 0.35 wt% of benzoyl peroxide to obtain a mixture, and then smelting, blending, extruding and pelleting the mixture by a twin-screw extruder at the temperature of 180-200 DEG C. Through the way, the phenomena that the blend of the polylactic acid / polyether ester segmented copolymers is directly extruded out, so that non-uniform band extrusion and breakage are easily caused are avoided, and the tenacity of the product is improved compared with that of pure PLA.

Description

technical field [0001] The invention belongs to the technical field of macromolecular materials, and relates to improving the swell, uneven extrusion and even broken bars of polylactic acid / polyether ester block copolymer blends during extrusion, improving the brittleness of polylactic acid itself, and improving the impact resistance Performance is the method of toughness, especially relates to polylactic acid (PLA) / polyether ester block copolymer (TPEE) and maleic anhydride in the presence of benzoyl peroxide in the extrusion process to prepare the product. Background technique [0002] Polylactic acid (PLA) is a 2 、H 2 The biodegradable aliphatic polyester of O, which can effectively reduce white pollution, has become the focus of research in recent years. Because polylactic acid has similar mechanical properties to traditional polymers such as polypropylene and polyethylene, good thermoplasticity and processing properties, and good biocompatibility, it is widely used in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L51/08C08F283/00
Inventor 罗发亮
Owner NINGXIA UNIVERSITY