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Full-biodegradable film with poly-carbonic acid 1,2-propylene diester as substrate and production method thereof

A technology for degrading films and polybutylene succinate, which is applied in the field of fully biodegradable films and preparation methods, can solve the problems of high production cost, poor mechanical properties, and difficulty in large-scale use, and achieves improved melt strength, cost reduction effect

Inactive Publication Date: 2009-04-08
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fully biodegradable films prepared by these methods have the defects of low heat resistance and poor mechanical properties
Chinese patent application number CN200610130556.8 can prepare biodegradable film with good heat resistance and flexibility by using 45-85% polylactic acid and 10-50% aliphatic polyester, but no specific data is given
Chinese patent application number CN200510021249.1 discloses a fully biodegradable film made of polydioxanone, which is difficult to use on a large scale because of the high production cost of the matrix resin

Method used

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  • Full-biodegradable film with poly-carbonic acid 1,2-propylene diester as substrate and production method thereof
  • Full-biodegradable film with poly-carbonic acid 1,2-propylene diester as substrate and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] The number average molecular weight is 108,000g / mol, the polybutylene succinate 30wt of the molecular weight distribution is 4.14 polybutylene succinate 60wt%, the number average molecular weight is 62,000g / mol, and the molecular weight distribution is 2.75 %, PEG-4005wt%, common grade talcum powder 5wt%, premixed in a high-speed mixer at 1000 rpm for 5 minutes, then added to a twin-screw extruder with a length-to-diameter ratio of 20 for blending, at 100-170°C Melt blending and extrusion under low temperature, using water-cooled strands to granulate, the obtained blended material was air-dried at 70°C for 2 hours to remove surface moisture, and the film was blown with a single-screw film blowing machine. The screw speed of the film blowing machine was 25 rpm Minutes, the temperature is controlled to be 100°C in zone I, 140°C in zone II, 170°C in zone III, 165°C in the die, blow-up ratio: 2.5, and a film with a thickness of 0.032mm is prepared. The mechanical properties...

Embodiment 2

[0025] The number average molecular weight is 114,000g / mol, the polybutylene succinate 20wt of the molecular weight distribution is 4.07 polybutylene succinate 60wt%, the number average molecular weight is 48,000g / mol, and the molecular weight distribution is 5.4 %, the number average molecular weight is 55,000g / mol, the molecular weight distribution is 10wt% of polylactic acid of 2.10, PEG-6007wt%, nano-scale silicon dioxide 3wt%, premixed 10 minutes with 1000 rpm in a high-speed mixer, and then Add to a twin-screw extruder with an aspect ratio of 35 for blending, melt blending and extruding at 100-170°C, use water-cooled strands to granulate, and air-dry the obtained blended material at 70°C for 2 hours to remove surface moisture , The film blowing conditions were the same as in Example 1, the inflation ratio: 2.2, and a film with a thickness of 0.040 mm was prepared. The mechanical properties are shown in Table 1.

Embodiment 3

[0027] The number average molecular weight is 72,000g / mol, the polybutylene succinate 20wt of the molecular weight distribution is 5.19 polybutylene succinate 55wt%, the number average molecular weight is 47,000g / mol, and the molecular weight distribution is 5.19 %, with a number average molecular weight of 43,000g / mol and a molecular weight distribution of 3.20, 15wt% of polylactic acid, 6wt% of dibutyl phthalate, 4wt% of nano calcium carbonate, premixed in a high-speed mixer at 1500 rpm 3 minutes, and then blended in a twin-screw extruder with an aspect ratio of 42, melt blended and extruded at 110-190 ° C, and pelletized under water, and the resulting blended material was vacuum-dried at 50 ° C for 4 hours to remove Surface moisture, blow the film with a single-screw film blowing machine, the screw speed of the film blowing machine is 15 rpm, the temperature control is 110°C in zone I, 140°C in zone II, 170°C in zone III, 175°C in the die, and the blowing ratio : 2, a film ...

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Abstract

The invention relates to a biodegradation thin film which takes poly (propylene carbonate) as matrix and a preparation method thereof. The thin film takes biodegradation poly (propylene carbonate) as matrix and is blended with biodegradation polyester and an auxiliary agent which can be in contact with food directly to prepare a special material for blown film. If a blown film is produced by common blown film equipment, the mechanical property of the film is close to that of linear low density polyethylene. The tensile strength and the elongation at break of the biodegradation thin film provided by the invention can respectively reach as high as 37MPa and 680 percent; and the tensile strength and the elongation at break of the linear low density polyethylene sold on markets are respectively 30MPa and 710 percent.

Description

technical field [0001] The invention belongs to the technical field of plastic films, and in particular relates to a fully biodegradable film with 1,2-propylene carbonate polycarbonate as a matrix and a preparation method. Background technique [0002] Packaging bags, garbage bags, agricultural mulch and other film products are widely used in daily life and have a short service life. Since most of these products are currently produced with non-biodegradable plastics (PE, PP), often To cause "white pollution", the use of fully biodegradable plastic film is one of the important solutions. [0003] 1,2-propylene glycol polycarbonate is a fully biodegradable plastic synthesized by the copolymerization of carbon dioxide and propylene oxide. Because carbon dioxide is used as a raw material (42-43% by weight) in the synthesis process, in addition to preventing white pollution caused by ordinary plastic films, it also has certain significance for reducing greenhouse gas emissions. ...

Claims

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Application Information

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IPC IPC(8): C08L69/00C08L67/00C08K5/12C08K3/26C08K3/36C08K3/34B29C55/28B29B9/02B29C47/92B29C47/60B29L7/00B29C48/92
CPCB29C48/92B29C2948/92704B29C2948/92895
Inventor 周庆海王献红高凤翔卢会敏赵晓江王佛松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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