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Method for preparing micro-foaming poly lactic acid based wood-plastic composite with supercritical fluid

A wood-plastic composite material and supercritical fluid technology, applied in the field of preparing micro-foamed polylactic acid-based wood-plastic composite materials, can solve the problems of high cell density, high foaming ratio, small cell size, etc. Evenly distributed effect

Active Publication Date: 2017-05-31
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that it is difficult to obtain PLA-based foamed wood-plastic composite materials with uniform cell distribution, high cell density, small cell size, and high expansion ratio in the existing preparation methods, and provides a supercritical fluid preparation method. Method for microfoaming polylactic acid-based wood-plastic composites

Method used

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  • Method for preparing micro-foaming poly lactic acid based wood-plastic composite with supercritical fluid
  • Method for preparing micro-foaming poly lactic acid based wood-plastic composite with supercritical fluid
  • Method for preparing micro-foaming poly lactic acid based wood-plastic composite with supercritical fluid

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specific Embodiment approach 1

[0018] Embodiment 1: A method for preparing micro-foamed polylactic acid-based wood-plastic composites with a supercritical fluid described in this embodiment is carried out in the following steps:

[0019] 1. Weigh 70-100 parts of polylactic acid, 10-30 parts of wood flour, 0-25 parts of toughening agent, 0-2.5 parts of chain extender, 0.5-2 parts of lubricant and 1 to 4 parts of nucleating agent;

[0020] 2. Weigh 70 to 100 parts of polylactic acid, 10 to 30 parts of wood powder, 0 to 25 parts of toughening agent, 0 to 2.5 parts of chain extender, 0.5 to 2 parts of lubricant and 1 part of ~4 parts of nucleating agent are placed in a high mixer and mixed to obtain the mixed material;

[0021] 3. Set the temperature of each section of the twin-screw extruder. From the feeding section to the machine head, the temperature of the first zone is 155°C, the temperature of the second zone is 160°C, the temperature of the third zone is 170°C, the temperature of the fourth zone is 180...

specific Embodiment approach 2

[0024] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the polylactic acid described in Step 1 has a melt index of 4g / 10min to 40g / 10min at a temperature of 190°C. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0025] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the wood flour in step 1 is 80 mesh to 200 mesh. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for preparing a micro-foaming poly lactic acid (PLA) based wood-plastic composite with a supercritical fluid, and relates to the method for preparing the micro-foaming PLA based wood-plastic composite. The method aims at solving the problem that a PLA based wood-plastic composite which is uniform in bubble distribution, high in bubble density, small in bubble size and high in foaming ratio is difficultly obtained by the existing preparation method. The method comprises the steps that PLA, wood flour, a flexibilizer, a chain extender, a lubricant and a nucleating agent are mixed in a high mixing machine; melt blending is performed by a twin-screw extruder; an extruded molten mixture is placed in a pressure forming machine to obtain the PLA based wood-plastic composite; clipping is performed; swelling and permeation are performed in the supercritical fluid; and then temperature reduction and foaming are performed to obtain the micro-foaming PLA based wood-plastic composite. The micro-foaming PLA based wood-plastic composite is uniform in bubble distribution, high in bubble density, small in bubble size and high in foaming ratio. The method is mainly used for preparing the micro-foaming PLA based wood-plastic composite with the supercritical fluid.

Description

technical field [0001] The invention relates to a method for preparing microfoamed polylactic acid-based wood-plastic composite materials. Background technique [0002] Wood-plastic composite material is a new type of environmentally friendly composite material, but traditional wood-plastic composite materials have exposed shortcomings such as high product density and poor impact resistance, which severely limit the further development of wood-plastic composite materials. At the same time, the plastic matrix used is the five general-purpose plastics polyethylene, polypropylene, polyvinyl chloride, polystyrene and ABS. In recent years, the continuous shortage of petroleum resources has caused the cost of thermoplastics to continue to rise, resulting in the price of wood-plastic composite products. high. Therefore, the low density, low cost, and high performance of wood-plastic composite materials have become the goals that researchers at home and abroad have been pursuing. ...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08J9/14C08L67/04C08L97/02C08L67/02B29C69/02B29C47/92B29C44/60B29C48/92
CPCB29C44/60B29C48/0012B29C48/07B29C48/92B29C2948/92514B29C2948/92704C08J9/122C08J9/141C08J9/142C08J2203/06C08J2203/08C08J2203/12C08J2203/14C08J2367/04C08J2497/02C08L67/04C08L2203/14C08L2205/02C08L2205/025C08L2205/035C08L2205/16C08L97/02C08L67/02
Inventor 宋永明王友勇房轶群刘天王清文
Owner NORTHEAST FORESTRY UNIVERSITY
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