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Polylactic acid and modified cellulose blend, preparation method and heat-proof macromolecule material

A polymer material, polylactic acid copolymer technology, applied in the polymer field, can solve the problems of slowness, transparency cannot be effectively controlled, shorten the crystallization time, etc., and achieve the effect of high heat resistance

Inactive Publication Date: 2008-12-03
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to polylactic acid and its slow melt crystallization process, it is difficult for amide compounds to control the melt crystallization during the molding process of polylactic acid alone, and it is necessary to further increase the crystallization rate of polylactic acid and shorten the crystallization time by adding talc powder
Therefore, the obtained molded product can not effectively control the transparency while improving the heat resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Polylactic acid (4032D, Natureworks, D-lactic acid unit content 1.4%) and ethyl cellulose (M200, Sinopharm Chemical Reagent Co., Ltd.) were placed in a vacuum oven, dried at 80°C for 10 hours, and passed through a twin-screw extruder Coextruded and granulated into a masterbatch of 4032D: ethyl cellulose = 70 / 30 (parts by weight). The temperature of the feeding section of the twin-screw extruder is 170° C., and the temperature of the other sections is 200° C. During the extrusion process, vacuum is exhausted.

[0035] The granulated mixture was dried in a vacuum oven at 80° C. for 10 hours, and then pressed into a film using a manual hot press. The temperature of the hot press is 200° C., the melting time is 3 minutes, and the holding time is 30 seconds. After the pressed melt was quenched with an ice-water mixture, a film with a thickness of about 0.5 mm was obtained.

[0036] The heat resistance of the test film was "△" at 65°C, "×" at 80°C, "×" at 100°C, and the tra...

Embodiment 2

[0038] Add 12 grams of polylactic acid (4032D, Natureworks, D-lactic acid unit content 1.4%) and 8 grams of ethyl cellulose (M200, Sinopharm Chemical Reagent Co., Ltd.) into a beaker filled with 500 milliliters of chloroform, and magnetically stir for 6 hours Finally, it was poured into a container and dried at room temperature for 3 days and crushed. After drying in a vacuum oven at 80° C. for 10 hours, it was pressed into a film using a manual hot press. The temperature of the hot press is 200° C., the melting time is 3 minutes, and the holding time is 30 seconds. After the pressed melt was quenched with an ice-water mixture, a film with a thickness of about 0.5 mm was obtained.

[0039] The heat resistance of the test film was "◎" at 65°C, "×" at 80°C, and "×" at 100°C, and the transparency was "good".

Embodiment 3

[0041] Add 10 grams of polylactic acid (4032D, Natureworks, D-lactic acid unit content 1.4%) and 10 grams of ethyl cellulose (M200, Sinopharm Chemical Reagent Co., Ltd.) into a beaker filled with 500 milliliters of chloroform, and magnetically stir for 6 hours Finally, it was poured into a container and dried at room temperature for 3 days and crushed. After drying in a vacuum oven at 80° C. for 10 hours, it was pressed into a film using a manual hot press. The temperature of the hot press is 200° C., the melting time is 3 minutes, and the holding time is 30 seconds. After the pressed melt was quenched with an ice-water mixture, a film with a thickness of about 0.5 mm was obtained.

[0042]The heat resistance of the test film was "◎" at 65°C, "◎" at 80°C, "◎" at 100°C, and the transparency was "good".

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Abstract

The invention discloses a blend of polylactic acid and modified cellulose, the preparation method thereof and a thermal-resistant polymer material. The blend is prepared from polylactic acid 70 to 10 weight parts, and modified cellulose 30 to 90 weight parts by blending. The polylactic acid / modified cellulose blend can be made into a thermal-resistant product with a thickness of 0.02 to 5 mm and a certain transparency by melting and shaping. Compared with polylactic acid matrix, the blend has higher thermal resistance and a certain transparency. The thermal-resistant polymer material prepared from polylactic acid and modified cellulose has excellent thermal resistance and a certain transparency.

Description

technical field [0001] The invention relates to the field of macromolecules, in particular to a polylactic acid / modified cellulose blend and a heat-resistant molded product with certain transparency prepared from the blend. Background technique [0002] In recent years, the consumption of polyethylene, polypropylene, polyester, nylon, etc., which are used as food and beverage containers, trays, etc., and commodity outer packaging materials has increased year by year. Along with this, the amount of post-use waste is also increasing. Incineration and landfilling of these wastes have caused various environmental problems. In order to solve these problems, biodegradable polymers have been increasingly used in recent years. Among them, polylactic acid is widely used in industry due to its relatively high melting point and relatively high mechanical properties. [0003] However, when polylactic acid is used as food and beverage containers, trays, etc., as well as commodity oute...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L1/08
Inventor 夏天徐征赖铮铮
Owner TORAY FIBER RES INST(CHINA) CO LTD
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