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Nano composite biological degradation plastic and preparing method thereof

A biodegradable plastic and nano-composite technology, applied in the field of nano-composite biodegradable plastics and its preparation, can solve the problems of high PLA production cost, slow polymer degradation rate, complex production process, etc., and achieve excellent mechanical properties and heat release speed Effects of retardation and increase in melt fluidity

Inactive Publication Date: 2008-04-23
LUDE GASOLINEEUM CHEM BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its ubiquitous problem is that when stretched, the elongation of polylactic acid is only 3-8%, and polylactic acid is a brittle material. When it is made into a film, it is difficult to meet the needs without orientation performance, and the production cost of PLA Relatively high, and the degradation rate of this polymer is still slow compared to the rate of waste accumulation
[0012] The above-mentioned biodegradable plastics containing polylactic acid still have problems such as complex production process, large investment, difficult operation, and toxic coupling agent.

Method used

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  • Nano composite biological degradation plastic and preparing method thereof
  • Nano composite biological degradation plastic and preparing method thereof
  • Nano composite biological degradation plastic and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] After mixing 1000 g of starch, 1 g of polyethylene glycol and 5 g of glycerin, extrude through a single-screw extruder at 120° C. and dry to obtain pregelatinized modified starch.

[0041] Disperse 200g of nano-montmorillonite with water that can wet it, add 700g of pre-gelatinized modified starch starch, 600g of PLA, stir and mix at high speed for 30 minutes, dry, and use a single-screw extruder at 130-140-160 Extrude and granulate at ℃.

[0042] It can also be directly formed into a film by blow molding after being extruded from a single-screw extruder. The membrane has a folded diameter of 50 cm.

Embodiment 2

[0044] After mixing 1000 g of starch, 10 g of polyethylene glycol and 0.1 g of glycerin, extruding through a single-screw extruder at 110° C. and drying to obtain pregelatinized modified starch.

[0045] Disperse 400g of nano-montmorillonite with water capable of wetting it (about 60g of water), add 300g of pregelatinized modified starch starch, 400g of PLA, 25g of plasticizer, stir and mix at high speed for 40 minutes, and after drying, use a single The screw extruder is extruded at 140°C, and the film is formed by blow molding process. The membrane has a folded diameter of 150 cm.

Embodiment 3

[0047] After mixing 1000g of starch, 5g of polyethylene glycol and 3g of glycerin, extruding through a single-screw extruder at 100°C and drying to obtain pregelatinized modified starch.

[0048] Disperse 300g of nano-montmorillonite with water capable of wetting it, add 500g of pre-gelatinized modified starch starch, 500g of PLA, and 55g of plasticizer, stir and mix at high speed for 20 minutes, dry, and then use a single-screw extruder 130 Extrude at ℃, granulate; or use blow molding process to form a film. The membrane has a folded diameter of 100 cm.

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Abstract

The present invention discloses one kind of nanometer composite biodegradable plastic and its preparation process. The nanometer composite biodegradable plastic consists of polylactic acid 200-600 weight portions, modified starch 300-700 weight portions, nanometer montmorillonite 200-400 weight portions, plasticizer 25-55 weight portions and dispersant 10-70 weight portions. The modified starch is polyglycol and glycerin modified pregelatinized starch comprising starch 100 weight portions, polyglycol 0.1-10 weight portions and glycerin 0.1-10 weight portions. The nanometer composite biodegradable plastic may be applied in producing high quality agricultural film and packing film with obvious biodegradability, high mechanical and physical performance.

Description

Technical field: [0001] The invention relates to nanocomposite biodegradable plastics and a preparation method thereof, in particular to nanocomposite bioplastics containing polylactic acid and modified starch and a preparation method thereof. Background technique: [0002] With the wide application of agricultural mulch film, the output of cotton, tobacco, and crops has increased significantly. However, due to non-degradable plastics remaining in farmland, soil compaction has caused new "white pollution". In addition, the amount of plastic waste in the field of daily life and shopping has also increased year by year, which has caused the disaster of "plastic waste", caused environmental pollution and affected the ecological balance; , The increasing shortage of raw materials and the rising international petroleum products have restricted the development of the plastics industry to a certain extent. [0003] Since the world's plastic output was nearly 200 million tons in t...

Claims

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Application Information

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IPC IPC(8): C08L3/04C08L67/04C08K3/34
Inventor 王明洋
Owner LUDE GASOLINEEUM CHEM BEIJING
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