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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: 2013-03-27
JIANGSU CHUNSHENTANG PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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] This embodiment provides a biodegradable heat-shrinkable material, the preparation process of which is as follows:

[0018] Take 500g PLA (number average molecular weight 45,000), 200g PBAT (number average molecular weight 35,000), 300g PCL (number average molecular weight 80,000) and 10g of ethylene isophthalate copolymer (number average molecular weight 8,000, melting point 110°C), After mixing, add the twin-screw extruder to melt and knead. The parameters of the melt kneading are as follows (twin-screw extruder; Φ=26mm; L / D=40; the temperature from the feeding zone to each zone of the die head 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), at around 230°C The blend is obtained, then extruded and granulated, and dried to obtain slices. The prepared slices were subjected to injection molding, the mold temperature was 110° C., and the cooling time was 120 seconds. The formed sheet was t...

Embodiment 2

[0020] This 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 ℃), mix Finally, it is added into a twin-screw extruder for melting and mixing. The parameters of melting and mixing are as follows (twin-screw extruder; Φ=26mm; L / D=40; the temperature from the feeding area to each area of ​​the die head is: 150°C , 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), prepared at about 230°C The blend is then subjected to extrusion granulation and dried to produce chips. The prepared slices were subjected to injection molding, the mold temperature was 110° C., and the cooling time was 120 seconds. Th...

Embodiment 3

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

[0024] Take 500g PLA (number average molecular weight 110000), 200g PBAT (number average molecular weight 80000), 300g PCL (number average molecular weight 100000) and 100g ethylene isophthalate copolymer (number average molecular weight 9000 melting point 135 ℃), after mixing , into the twin-screw extruder for melting and mixing, the parameters of the melting and mixing are as follows (twin-screw extruder; 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 subjected to extrusion granulation and dried to obtain chips. The prepared slices were subjected to injection molding, the mold temperature was 110° C., and the cooling time was 120 seconds. The formed sheet was tested, and the test data is shown in Table 1.

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Abstract

The invention relates to a biodegradable heat-shrinkable material, a biodegradable heat-shrinkable film and a preparation method of the biodegradable heat-shrinkable film. The heat-shrinkable material is a slice obtained through melting mixing and extrusion granulating of a polylactic acid composition in a screw extruder and drying, the polylactic acid composition comprises 95-99.5wt% of a resin component and 0.5-5wt% of a plasticizer, the resin component is prepared through mixing polylactic acid having a weight-average molecular weight of 20000-250000, polybutylene adipate glycol having a weight-average molecular weight of 6000-100000 and polycaprolactone having a weight-average molecular weight of 30000-200000 according to a weight ratio of 1:0.05-1:0.05-1, and the plasticizer is a polyethylene glycol m-phthalate copolymer having a number-average molecular weight of 8000-10000 and a melting point of 110-150DEG C. The heat-shrinkable material and the heat-shrinkable film have the advantages of especially good heat-shrinkable performance and simple processing technology.

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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IPC IPC(8): C08L67/04C08L67/02B29C47/92B29C48/92
CPCB29C48/04
Inventor 卞忠华
Owner JIANGSU CHUNSHENTANG PHARMA
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