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Preparation method of biodegradable polymer foamed sheet product

A foamed sheet, biodegradable technology, applied in the field of preparation of biodegradable polymer foamed sheet products, can solve the problems of difficult PLA foamed materials, unstable production process, increased material cost, etc., and achieve mechanical properties Excellent, conducive to industrial implementation, and easy to operate

Active Publication Date: 2012-11-21
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

[0009] Supercritical CO 2 The preparation of PLA foamed sheets by fluid continuous extrusion has been disclosed and reported, but this technology is difficult to apply to the preparation of PLA foamed materials with high crystallinity, and the foamed products have the problem of low service temperature; although continuous extrusion foaming has High production efficiency, but the products produced usually have high open cell content and large cell size, and there are problems with poor mechanical properties; in addition, the melt strength of general-purpose PLA is low, and this technology requires PLA to be processed Modification, there are problems of increasing the cost of materials and unstable production process

Method used

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  • Preparation method of biodegradable polymer foamed sheet product
  • Preparation method of biodegradable polymer foamed sheet product
  • Preparation method of biodegradable polymer foamed sheet product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add semi-crystalline PLA (the product of NaureWorks company, the weight percentage of D-type lactic acid monomer in PLA resin is 4.2%) to the single-screw extruder, and the PLA melt is transported to the extruder through single-screw extrusion Die opening, extrusion of PLA melt and drawing to prepare a PLA sheet with a thickness of 0.3 mm.

[0037] The prepared PLA sheet is put into an autoclave, and a high-pressure CO with a pressure of 8 MPa is introduced. 2 Fluid, make the PLA sheet reach saturation, the saturation temperature is 40°C, the saturation time is 5h, and the saturated PLA sheet is obtained. The saturated polylactic acid sheet was foamed in a water bath at 80° C. for 10 seconds to obtain a PLA microfoamed sheet.

[0038] The prepared PLA microfoamed sheet has a smooth and smooth appearance structure. Scanning electron microscope analysis was carried out on the quenched section of the PLA microfoamed sheet sample, such as figure 1 As shown, it shows that...

Embodiment 2

[0042] Except that the foaming heating medium of the PLA sheet uses hot air at 110°C and the foaming time is 30s, other operations are the same as in Example 1, and PLA microfoamed sheets and biodegradable polylactic acid microfoamed sheet products are obtained . The prepared PLA microfoamed sheet has a smooth and smooth appearance structure. The scanning electron microscope analysis of the quenched section of the PLA micro-foamed sheet sample shows that the cell structure of the PLA micro-foamed sheet is evenly distributed, and the cell density is 9.8×10 9 cells / cm 3 , the expansion ratio is 3.2. The differential scanning calorimeter (DSC) test shows that: the crystallinity of the PLA microfoamed sheet is 38%, and the crystallinity of the biodegradable polylactic acid microfoamed sheet product is 47%. The research of the tensile testing machine shows that the maximum tensile stress of the biodegradable polylactic acid microfoamed sheet is 23.2MPa, and the maximum tensile s...

Embodiment 3

[0044] Except that the PLA sheet is foamed in a water bath at 50°C for 10s, then foamed in a water bath at 60°C for 10s, and then foamed in a water bath at 80°C for 10s, the other operations are the same as in Example 1 to prepare PLA microsheets. Foamed sheets and biodegradable polylactic acid microfoamed sheet products. The prepared PLA microfoamed sheet has a smooth and smooth appearance structure. The scanning electron microscope analysis of the quenched section of the PLA micro-foamed sheet sample shows that the cell structure of the PLA micro-foamed sheet is evenly distributed, and the cell density is 3.8×10 9 cells / cm 3 , the expansion ratio is 6.2. The differential scanning calorimeter (DSC) test shows that: the crystallinity of the PLA microfoamed sheet is 37%, and the crystallinity of the biodegradable polylactic acid microfoamed sheet product is 48%. The research of the tensile testing machine shows that the maximum tensile stress of the biodegradable polylactic ...

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Abstract

The invention discloses a preparation method of a biodegradable polymer foamed sheet product, comprising the following steps of: putting a polymer sheet into high-pressure fluid with the pressure of 0.5-10MPa to saturate the polymer sheet; then putting the saturated polymer sheet into a hot medium with the temperature of 40-140 DEG C for foaming for 2-300 seconds to obtain a polymer foamed sheet;and forming the polymer foamed sheet by heat treatment to obtain the biodegradable polymer foamed sheet product, wherein the polymer sheet is made of polylactic acid or the blend of polylactic acid and a polymer with an ester group or ether bond, and the thickness of the sheet is 0.1-2.0mm. The process disclosed by the invention is simple to operate, easy to control and favorable for industrial implementation, and the product has the advantages of bright and clean surface, light weight, uniform closed pore structure with the pore size of 5-50 micrometers, high tensile modulus and strength, excellent temperature tolerance and the like.

Description

technical field [0001] The invention relates to the field of preparation methods of biodegradable polymer foam sheet products, in particular to a preparation method of biodegradable polylactic acid or a blend of polylactic acid and polymers with ester groups or ether bonds . Background technique [0002] Polystyrene (PS) foam material is widely used in the field of cushioning packaging and food packaging due to its excellent heat insulation, sound insulation and impact resistance. However, petroleum-based polymer materials such as PS are difficult to degrade in the natural environment, which has caused serious "white pollution" problems worldwide. The development of an environmentally friendly foaming material based on biodegradable plastics has aroused great interest in the industry. and broad interest in academia. [0003] Polylactic acid (PLA) is a thermoplastic polymer resin synthesized from renewable resources such as corn and plant straw. Promising polymer resins. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/12C08J9/14C08L67/04C08L67/02C08L29/04C08L71/08C08L3/02B29C71/02
Inventor 翟文涛郑文革汪璟凌建强
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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