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Polylactic acid and poly(3-hydroxybutyrate-co-4-hydroxybutyrate) nano modified composite

A -co-4-, hydroxybutyrate technology, applied in the field of new polylactic acid PLA and poly nano-modified composite materials, can solve the problems of slow crystallization speed, poor impact resistance, low heat distortion temperature, etc.

Inactive Publication Date: 2012-09-19
TIANJIN GREENBIO MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the defects of PLA resin such as hard and brittle, poor impact resistance, slow crystallization speed, and low heat distortion temperature limit its wide application in thermoplastic processing and daily life.

Method used

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  • Polylactic acid and poly(3-hydroxybutyrate-co-4-hydroxybutyrate) nano modified composite
  • Polylactic acid and poly(3-hydroxybutyrate-co-4-hydroxybutyrate) nano modified composite

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preparation example Construction

[0023] The preparation steps of modified composite material of the present invention are:

[0024] (1) Add PLA, P3 / 4HB with a certain 4HB content and fillers or additives according to the specified ratio, and add them to a high-speed mixer and stir at high speed for 5-8 minutes to obtain a premixed base material;

[0025] (2) the premixed base material is used to blend and extrude the strip with a twin-screw extruder;

[0026] The screw configuration of the twin-screw extruder is as follows figure 2 shown. Among them, the setting parameters of the twin-screw are: the main engine frequency is 10Hz, the feeding frequency is 8Hz, the setting from the feeding port to the machine head is set to 8 sections, and the temperature setting values ​​of each section of 1, 2, 3, 4, 5, 6, 7, and 8 are respectively 0°C, 150°C, 160°C, 170°C, 180°C, 180°C, 180°C, 180°C; the setting parameters of the barrel temperature of the injection molding machine are: HZ, H1, H2, H3 are 165-175°C, H4, H...

Embodiment 1

[0036] Take by weighing 400g molecular weight respectively and be 530,000, the P3 / 4HB copolymer (Tianjin Guoyun) and 1600g polylactic acid (Nature Works) that 4HB molar content is 20%, after mixing uniformly, extrude through twin-screw extruder, after extruding After cooling in ice water, use a granulator to cut pellets, the diameter of the pellets is about 3mm, and then inject the pellets with an injection molding machine; the setting parameters of the twin-screw are: host frequency 10Hz, feeding frequency 8Hz, from feeding port A to The temperature setting values ​​of each section of the machine head are 0°C, 150°C, 160°C, 170°C, 180°C, 180°C, 180°C, 180°C; the setting parameters of the barrel temperature of the injection molding machine are: HZ, H1, H2, H3 is 170°C, H4 and H6 are 0°C, and the molded product is a light yellow translucent glossy solid. The mechanical properties of the obtained material: the elongation at break is 220.2%, the tensile strength is 44.2MPa, and th...

Embodiment 2

[0038] Take by weighing 1800g molecular weight respectively and be 530,000, the P3 / 4HB copolymer (Tianjin Guoyun) and 200g polylactic acid (Nature Works) that 4HB molar content is 20%, after mixing uniformly, extrude through twin-screw extruder, after extruding After cooling in ice water, use a granulator to cut pellets, the diameter of the pellets is about 3mm, and then inject the pellets with an injection molding machine; the setting parameters of the twin-screw are: host frequency 10Hz, feeding frequency 8Hz, from feeding port A to The temperature setting values ​​of each section of the machine head are 0°C, 150°C, 160°C, 170°C, 180°C, 180°C, 180°C, 180°C; the setting parameters of the barrel temperature of the injection molding machine are: HZ, H1, H2, H3 The temperature is 170°C, H4 and H6 are non-heating zones, and the molded product is a translucent glossy solid. The elongation at break of the obtained material can reach 507.2%. It cannot be punched without notched impac...

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Abstract

The invention provides a polylactic acid and poly(3-hydroxybutyrate-co-4-hydroxybutyrate) nano modified composite. The molar content of 4-hydroxybutyrate in the poly(3-hydroxybutyrate-co-4-hydroxybutyrate) is 15%-35%. A preparation method of the composite includes: firstly, compounding polylactic acid, poly(3-hydroxybutyrate-co-4-hydroxybutyrate) and filler or auxiliaries according to a stated proportion, adding into a high-speed mixer for mixing 5-8min to obtain premixed matrix; secondly, using a double-screw extruder for mixing extrusion of the premixed matrix to obtain material strips, wherein set parameters of double screws include that the main unit frequency is 10Hz, the feeding frequency is 8Hz, eight segments are arranged from a feeding port A to a head, and temperature set values of the eight segments are 0 DEG C, 150 DEG C, 160 DEG C, 170 DEG C, 180 DEG C, 180 DEG C, 180 DEG C and 180 DEG C respectively, and temperature set parameters of a feed cylinder of an injection molding machine include that HZ, H1, H2 and H3 are 170 DEG C and H4 and H6 are 0 DEG C or heating-free; and thirdly, subjecting the material strips to cooling and granulating after extrusion to obtain the polylactic acid and poly(3-hydroxybutyrate-co-4-hydroxybutyrate) nano modified composite.

Description

technical field [0001] The invention relates to the blending modification of polymers, in particular to a novel polylactic acid PLA and poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P3 / 4HB) nano-modified composite material. Background technique [0002] PLA (Polylactic acid) is a completely biodegradable aliphatic polyester, which can be completely decomposed by microorganisms in nature after use, and finally produces carbon dioxide and water. It does not pollute the environment and is recognized as an environmentally friendly material. PLA is recyclable and made from starch raw materials extracted from plant resources (such as corn). Starch raw materials are fermented into lactic acid, and then converted into polylactic acid through chemical synthesis, which frees us from dependence on petroleum resources. At the same time, any treatment of its products is to return carbon dioxide to nature, becoming an eternal closed carbon cycle system, which will not cause the increase ...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K9/04C08K9/06C08K3/34C08K3/26C08K3/36C08K5/11B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/875B29C48/92B29C2948/92704B29C2948/92895
Inventor 许开天吕渭川杨亚亚崔淑君
Owner TIANJIN GREENBIO MATERIAL CO LTD
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