Completely-biodegradable polylactic acid-based blow molding thin film and preparation method thereof

A polylactic acid-based, biodegradable technology, applied in the field of PLA biodegradable film and its preparation, can solve problems such as unresearched PLA blown film, achieve great economic and social significance, maintain transparency, and have broad market prospects.

Active Publication Date: 2018-11-16
HEILONGJIANG XINDA ENTERPRISE GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The above are domestic and foreign studies on the modification of PLA films, but none of them

Method used

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  • Completely-biodegradable polylactic acid-based blow molding thin film and preparation method thereof
  • Completely-biodegradable polylactic acid-based blow molding thin film and preparation method thereof
  • Completely-biodegradable polylactic acid-based blow molding thin film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Examples 1-7 and comparative examples 1-5 complete biodegradable polylactic acid-based blown film weight proportions are shown in Table 1; wherein, comparative example 1 is the same as embodiment 1, only PBSA and PBC are replaced by PLA; comparative example 2 is the same as in Example 1, only diethylene glycol monobutyl ether adipate is removed; Comparative Example 3 is the same as in Example 1, only the lubricant and the opening agent are removed.

[0043] Among them, the weight average molecular weight of PLA is 1.5×10 5 g·mol -1 ; PBSA weight average molecular weight 2.5 × 10 5 g·mol -1 ;PBC weight average molecular weight 1.23×10 5 g·mol -1 .

[0044] The preparation method of the completely biodegradable polylactic acid base blown film of embodiment 1-7 and comparative example 1-5 is:

[0045] 1) Weighing PLA, PBSA, PBC, ethylene bisstearamide and erucamide according to the weight ratio, and mechanically blending each component for 5 minutes;

[0046] 2) Add...

Embodiment 8

[0056] Raw material ratio, by weight, PLA 78 parts, PBSA 20 parts, PBC 10 parts, acetyl tributyl citrate 10 parts, ethylene bis stearamide 0.8 parts, oleic acid amide 0.6 parts;

[0057] Preparation method: 1) Weigh PLA, PBSA, PBC, ethylene bisstearic acid amide, and oleic acid amide according to the weight ratio, and mechanically blend the components for 5 minutes;

[0058] 2) Add the mixed raw materials into the twin-screw extruder, add the above-mentioned acetyl tributyl citrate quantitatively with a peristaltic pump to the side line of the extruder during the extrusion process, and the conditions for extrusion and granulation are: The set temperature is: Zone 1: 130°C, Zone 2: 150°C, Zone 3: 160°C, Zone 4: 160°C, Zone 5: 165°C, Zone 6: 170°C, Zone 7: 170°C, Zone 8: 170°C, machine head: 170°C, screw speed: 150rpm, extrude, granulate and dry to obtain polylactic acid blown film resin material;

[0059] 3) The resin material obtained in step 2) is blown into a film by a blow...

Embodiment 9

[0061] Raw material ratio, by weight, 60 parts of PLA, 10 parts of PBSA, 20 parts of PBC, 15 parts of diacetyl epoxy vegetable glycerin oleate, 0.6 part of ethylene bis stearamide, 0.2 part of oleic acid amide;

[0062] Preparation method: 1) Weigh PLA, PBSA, PBC, ethylene bisstearic acid amide, and oleic acid amide according to the weight ratio, and mechanically blend the components for 5 minutes;

[0063] 2) Add the mixed raw materials into a twin-screw extruder, and add the above-mentioned diacetyl epoxy vegetable glycerin oleate quantitatively with a peristaltic pump to the side line of the extruder during the extrusion process. The conditions for extrusion and granulation are: twin-screw extrusion The set temperature of the machine is: zone 1: 140°C, zone 2: 150°C, zone 3: 150°C, zone 4: 160°C, zone 5: 165°C, zone 6: 165°C, zone 7: 165°C, zone 8 Zone: 170°C, machine head: 170°C, screw speed: 250rpm, extrude, granulate and dry to obtain polylactic acid blown film resin mat...

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Abstract

The invention belongs to the field of polymer materials, and particularly relates to a PLA (polylactic acid) biodegradable thin film and a preparation method thereof. The PLA biodegradable thin film is prepared from the following components of PLA, PBSA (poly(butylene succinate-co-adipate)), PBC (polypropylene carbonate), a plasticizer, a lubricant and a pore forming agent. The preparation methodcomprises the following steps of mechanically mixing the PLA, the PBSA, the PBC, the lubricant and the pore forming agent; adding the mixed raw materials into a material hopper of a double-screw extruder; metering the plasticizer by a metering pump, adding via a liquid adding port of the extruder, starting the solid charge and liquid charge, smelting, extruding and granulating, so as to obtain thePLA resin material; performing blow molding and film forming on the PLA resin material, so as to obtain the PLA-based thin film. The PLA-based thin film has the advantages that the mechanical property is better, and the transparency is good; the complete biodegradable effect is realized; the PLA-based thin film can be used for replacing PE (polyethylene), PP (polypropylene), PVC (polyvinyl chloride) and the like to prepare thin films and sheets.

Description

technical field [0001] The invention belongs to the field of polymer materials, and more specifically relates to a PLA biodegradable film and a preparation method thereof. Background technique [0002] Unlike traditional petroleum-based plastics, polylactic acid (PLA) is polymerized from lactic acid fermented from plant starch. This is a renewable resource with biodegradable properties, which is of great significance to environmental protection. In the increasingly tense situation of petroleum energy, the development and research of PLA resin is particularly important. The properties of PLA itself are similar to the general-purpose plastic polypropylene, such as high modulus, high tensile strength and good processability. However, the brittleness of PLA is serious, and the impact strength is less than 5KJ / m 2 , seriously restricting its wide application. [0003] PLA also has good processing performance and transparency, and can be applied to traditional extrusion, inject...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L67/02C08L69/00C08K5/11C08K5/1515C08K5/103C08K5/20C08J5/18
CPCC08J5/18C08J2367/04C08J2467/02C08J2469/00C08K5/103C08K5/11C08K5/1515C08K5/20C08K2201/014
Inventor 张会良杨佳潘宏伟杨慧丽张贵宝白云刚马庆维林航谢众崔成杰张海斌
Owner HEILONGJIANG XINDA ENTERPRISE GRP
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