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Bio-based polyester modified polylactic acid resin and its preparation method and processing molding method

A polylactic acid resin and polyester modification technology, which is applied in the field of bio-based polymer materials and polymer molding processing, can solve the problem of small improvement in impact strength and elongation at break, no surface reflection, and polylactic acid tensile strength. Drops and other issues, to achieve the effect of high pearlescent color reflection, good eco-friendliness

Active Publication Date: 2017-05-24
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In CN103483788A, ethylene-vinyl acetate copolymer and glycidyl methacrylate are used to carry out crystallization control and toughening modification of polylactic acid. Although the elongation at break and the notched impact strength are improved a lot, the tensile strength of polylactic acid after modification Nearly 40% reduction in strength
In CN101168617A, polylactic acid is toughened and modified by using isophthalic acid, hexamethylenediamine, 1,4-butanediol, etc. as the third monomer to carry out copolymerization modification of PET, although the modified The tensile strength of polylactic acid decreases less, but the impact strength and elongation at break increase little
In CN104817834A, ultrafine calcium carbonate and low-temperature toughening agent are used to modify polylactic acid. Although the tensile strength of polylactic acid after modification decreases less, its melt flow rate becomes poor, which reduces the processability of the polymer
In addition, most of the existing modified polylactic acid materials do not have surface reflectivity without adding materials such as pearl powder.

Method used

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  • Bio-based polyester modified polylactic acid resin and its preparation method and processing molding method
  • Bio-based polyester modified polylactic acid resin and its preparation method and processing molding method
  • Bio-based polyester modified polylactic acid resin and its preparation method and processing molding method

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preparation example Construction

[0029] Another aspect of the present invention provides a method for preparing the high-reflection and high-toughness polylactic acid modified resin, comprising: fully drying polylactic acid and polybutylene furandicarboxylate at 80-100°C, and The dried polylactic acid, polybutylene furandicarboxylate, antioxidant and additives are banburyed and blended under the conditions of 175-200° C., 30-70 rpm, and 4-8 minutes.

[0030] As a preference, the aforementioned banbury blended product can also be put into a mold, preheated at 190-200°C for 3-6 minutes, for example 5 minutes, and hot-pressed at 12-16MPa for 2-4 minutes, for example After 3 minutes, a hot-press molded body, such as a highly reflective and high-toughness polylactic acid modified resin sheet, can be obtained.

[0031] As preferably, it is also possible to carry out extrusion granulation through a twin-screw extruder after fully drying polylactic acid, polybutylene furandicarboxylate, antioxidant and auxiliary agen...

Embodiment 1

[0042] The polylactic acid PLA (4032D), the aforementioned PBF, antioxidant AT1010, lubricant PETS-3, and ultraviolet light absorber UV-531 after vacuum drying at 90°C for 2 hours are in a mass ratio of 94:4.5:0.5:0.5: 0.5 Banburying was carried out in a Brabender torque rheometer, the banburying temperature was 185°C, the rotating speed was 50 rpm, and the banburying time was 6 minutes to obtain a blend;

[0043] The obtained blend is put into a mold, preheated at 195° C. for 5 minutes, and hot-pressed at 15 MPa for 3 minutes to obtain a reflective high-toughness polylactic acid modified resin sheet.

Embodiment 2

[0045] The preparation process of this example is the same as that of Example 1, except that the mass ratio of PLA, PBF, antioxidant AT1010, lubricant PETS-3, and ultraviolet light absorber UV-531 is 89:9.5:0.5:0.5:0.5.

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Abstract

The invention discloses a bio-based polyester modified polylactic resin, a preparation method and a processing forming method. The modified polylactic resin comprises 67-95wt% of polylactic acid, 4-30wt% of poly(butylene 2,5-furandicarboxylate), 0.5-1wt% of anti-oxidant and 0.5-2wt% of auxiliary agent. The preparation method is as follows: polylactic acid and poly(butylene 2,5-furandicarboxylate) are dried fully, then are subjected to banburying blending with the anti-oxidant and the auxiliary agent and a target product is obtained. The modified polylactic resin is renewable and environmental protection resin, the tensile strength is more than or equal to 60 MPa, the fracture percentage elongation is 180-240%, when the fracture percentage elongation is 240%, the tensile modulus is lowered by only 25%, and the tensile strength is lowered by only 16%, no pearl essence addition is needed, the surface has pearlescent color reflect light, and the modified polylactic resin can be used for preparing films, plates, sheets, foaming and injection molding plastic products and the like, and has wide industrial application prospects.

Description

technical field [0001] The invention relates to a bio-based polyester modified polylactic acid resin and its preparation method and application, in particular to a highly reflective and high-toughness polylactic acid modified resin and its preparation method and processing molding method, belonging to bio-based polymer materials and Polymer molding processing field. Background technique [0002] Polylactic acid (PLA), also known as lactide, is a biodegradable synthetic polymer with good biocompatibility, compostability, and biodegradability, and can be gradually degraded in the human body or in the natural environment. , eventually decomposed into carbon dioxide and water. Due to its biological origin and degradability, it can replace traditional petroleum-based polymer materials, and has broad application prospects in medical, pharmaceutical, agricultural, packaging and other fields. Although polylactic acid has high strength and modulus, its toughness is poor, the proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L67/02B29C47/92B29C45/76B29C48/92
Inventor 龙昱张俊午张若愚李经纬刘伟朱锦徐伟
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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