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Preparation method of novel all-degradable plastic blend

A completely degradable and blended technology, applied in the field of preparation of new completely degradable plastic blends, can solve the problems of poor compatibility, unpractical application, poor performance, etc., and achieve low cost, good biodegradability and The effect of mechanical properties

Inactive Publication Date: 2013-12-25
ZHEJIANG PHOTOSYNTHETIC ORGANISMS MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor compatibility of the simple blend of polylactic acid / starch, its performance is very poor, so it cannot be practically applied.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Mix starch with ATBC plasticizer and 2,4 dimethyl-dicumyl carbodiimide at a mass ratio of 90:9:1 through a mixer for 2 minutes;

[0019] (2) The above powder and polylactic acid particles are mixed in a mixer according to a certain mass ratio of 50:50, and then granulated by twin-screw blending and extrusion. The blending temperature is 170°C to form a polylactic acid / starch blend. Resin particles

[0020] (3) The above particles are injected into standard splines through an injection molding machine. Test its mechanical properties.

Embodiment 2

[0022] (1) Mix starch with ATBC plasticizer and 2,4 dimethyl-dicumyl carbodiimide at a mass ratio of 85:10:5 through a mixer for 5 minutes;

[0023] (2) The above powder and polylactic acid particles are mixed in a mixer according to a certain mass ratio of 50:50, and then granulated by twin-screw blending and extrusion. The blending temperature is 170°C to form a polylactic acid / starch blend. Resin particles

[0024] (3) The above particles are injected into standard splines through an injection molding machine. Test its mechanical properties.

[0025] The results of Examples 1 and 2 are compared as follows:

[0026] PP Implementation example 1 Implementation example 2 Tensile Strength 24MPa 19MPa 20MPa Modulus 0.8GPa 1.0GPa 1.1GPa Elongation at break 4% twenty two% twenty three% Bending strength 28MPa 23MPa 32MPa Modulus 1.0GPa 1.1GPa 1.2GPa Impact strength 20J / M 11J / M 12J / M colour white white white

[0027] It can be seen from the above comparison table that the mech...

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Abstract

The invention discloses a preparation method of a novel all-degradable plastic blend, which comprises the following steps: (1) mixing starch, plasticizer and carbodiimide in a mass ratio of (60-90):(10-40):(0-5) in a high-speed mixer for 1-5 minutes; (2) mixing the powder body and polylactic acid in a mass ratio of (10-90):(10-90) in a mixer, meamwhile, adding diisocyanate, and carrying out blend extrusion with a double screw extruder for granulation; and (3) forming the blend granules at 150-200 DEG C to obtain a plastic product. The polylactic acid / starch blend prepared by the method disclosed by the invention has the advantages of favorable biodegradability, favorable mechanical properties and low cost (approximate to common plastic).

Description

[0001] Technical field [0002] The invention belongs to the field of preparation of completely degradable plastics, and particularly relates to a preparation method of a novel completely degradable plastic blend. Background technique [0003] Biodegradable plastic polylactic acid PLA is an environmentally friendly plastic, which can be completely converted into carbon dioxide and water under composting conditions. It is a new type of plastic with great environmental protection significance. However, due to the high production cost of general biodegradable plastics, it is expensive. , Much higher than ordinary plastics, which greatly restricts its application range. [0004] The prior art can reduce the production cost of biodegradable plastics by filling polylactic acid with starch. However, due to the poor compatibility of the simple blend of polylactic acid / starch, its performance is poor, and it cannot be used in practice. Summary of the invention [0005] The invention provide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L3/02C08K5/101C08K5/29
Inventor 史凡黄德全黄联鑫
Owner ZHEJIANG PHOTOSYNTHETIC ORGANISMS MATERIAL
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