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Biodegradable heat-shrinkable material, biodegradable heat-shrinkable film and preparation method of biodegradable heat-shrinkable film

A biodegradable and heat-shrinkable technology, applied in the field of biodegradable heat-shrinkable film and its preparation, can solve the problem of high processing cost and achieve the effect of simple processing technology

Inactive Publication Date: 2014-08-20
JIANGSU CHUNSHENTANG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, the thermal shrinkage rate of the materials obtained by these methods is only about 50%, and the processing of heat shrinkable films often adopts the method of multi-layer co-extrusion, and the processing cost is relatively high.

Method used

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  • Biodegradable heat-shrinkable material, biodegradable heat-shrinkable film and preparation method of biodegradable heat-shrinkable film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The present embodiment provides a biodegradable heat-shrinkable material, the preparation process of which is as follows:

[0018] Take 500g PLA (number average molecular weight 45000), 200g PBAT (number average molecular weight 35000), 300g PCL (number average molecular weight 80000) and 10g ethylene isophthalate copolymer (number average molecular weight 8000, melting point 110°C), After mixing, add the twin-screw extruder for melt-kneading. The parameters of melt-kneading are as follows (twin-screw extruder; Φ=26mm; L / D=40; the temperature from the feeding zone to the die head is: 150 ℃, 180℃, 200℃, 200℃, 200℃, 200℃, 200℃, 200℃, 195℃, 195℃; pressure 0.3~1.2MPa; torque 54%; feeding rate 23s), made at about 230℃ The blend is then extruded and pelletized, and dried to obtain chips. The obtained slices were injection-molded with a mold temperature of 110° C. and a cooling time of 120 seconds. The formed sheet was tested, and the test data are shown in Table 1.

Embodiment 2

[0020] The present embodiment provides a biodegradable heat-shrinkable material, the preparation process of which is as follows:

[0021] Take 500g PLA (number average molecular weight 80000), 200g PBAT (number average molecular weight 60000), 300g PCL (number average molecular weight 60000) and 50g ethylene isophthalate copolymer (number average molecular weight 9000, melting point 120°C), mix Then, add the twin-screw extruder for melt-kneading. The parameters of melt-kneading are as follows (twin-screw extruder; Φ=26mm; L / D=40; the temperature from the feeding zone to the die head is: 150℃ , 180℃, 200℃, 200℃, 200℃, 200℃, 200℃, 200℃, 195℃, 195℃; pressure 0.3~1.2MPa; torque 54%; feeding rate 23s), prepared at about 230℃ The blend is then extrusion granulated and dried to produce chips. The obtained slices were injection-molded with a mold temperature of 110° C. and a cooling time of 120 seconds. The formed sheet was tested, and the test data are shown in Table 1.

Embodiment 3

[0023] The present embodiment provides a biodegradable heat-shrinkable material, the preparation process of which is as follows:

[0024] Take 500g PLA (number-average molecular weight 110,000), 200g PBAT (number-average molecular weight 80,000), 300g PCL (number-average molecular weight 100,000) and 100g ethylene isophthalate copolymer (number-average molecular weight 9000, melting point 135°C), after mixing , adding a twin-screw extruder for melt-kneading, and the parameters of melt-kneading are as follows (twin-screw extruder; Φ=26mm; L / D=40; the temperature from the feeding area to the die area is: 150℃, 180°C, 200°C, 200°C, 200°C, 200°C, 200°C, 200°C, 195°C, 195°C; pressure 0.3~1.2MPa; torque 54%; feeding rate 23s), a total of The mixture is then extruded and pelletized, and dried to obtain chips. The obtained slices were injection-molded with a mold temperature of 110° C. and a cooling time of 120 seconds. The formed sheet was tested, and the test data are shown in...

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Abstract

The invention relates to a biodegradable heat-shrinkable material, a biodegradable heat-shrinkable film and a preparation method thereof. The heat-shrinkable material is a polylactic acid composition in a screw extruder, which is melted and kneaded, extruded and granulated, and dried to obtain chips. The polylactic acid composition consists of 95wt% to 99.5wt% resin components and 0.5wt% ~5wt% plasticizer, and the resin components are polylactic acid with a weight average molecular weight of 20,000 to 250,000, polybutylene adipate with a weight average molecular weight of 6,000 to 100,000, and polycaprolactone with a weight average molecular weight of 30,000 to 200,000 It is mixed according to the weight ratio of 1:0.05~1:0.05~1, and the plasticizer is an ethylene glycol isophthalate copolymer with a number average molecular weight of 8,000~10,000 and a melting point of 110°C~150°C. The heat-shrinkable material and the heat-shrinkable film of the present invention have particularly good heat-shrinkage performance, and the processing technology is simple.

Description

technical field [0001] The invention relates to a biodegradable heat-shrinkable material, in particular to a biodegradable heat-shrinkable film and a preparation method thereof. Background technique [0002] It is known that heat-shrinkable films are used in the packaging, sales and transportation of various products. The outside of containers such as beverages. From the point of view of performance, the requirement for heat shrinkable film is that it must have high puncture resistance, good shrinkage and certain shrinkage stress. During the shrinking process, the film cannot produce holes; The shrink film has good biodegradability, so when the heat shrink film is discarded, it will not cause environmental pollution. In addition, the source of raw materials for heat shrinkable films needs to be considered, and the use of non-renewable resources should be avoided as much as possible. At present, most heat shrinkable films are mainly made of PE, PP, PVC, POF and other mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L67/02B29C47/92B29C48/92
CPCB29C47/0011B29C47/92B29C48/04
Inventor 卞忠华
Owner JIANGSU CHUNSHENTANG PHARMA
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