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Formable polylactic resin composition and preparation method for plastic strip thereof

A technology of polylactic acid resin and composition, which is applied in the preparation of polylactic acid resin composition and its plastic strips, and the field of modified lactic acid composition, which can solve the problems of complex production process, easy rusting of iron wire, and easy scratching of masks, etc. Achieve the effect of good surface gloss, low price and simple process

Active Publication Date: 2012-08-15
CHINA NAT BLUESTAR (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are shapeable plastic strips installed in the mask or the seal of the food bag, and the shapeable plastic strip is added to the mask, so that the mask can be tightly attached to the face after wearing, and it is not easy to fall off; the shapeable plastic strip is added to the food sealing bag. The structure of the shapeable plastic strip is iron wire covered with polypropylene plastic, and its disadvantage is that the two ends of the iron wire in the plastic strip are exposed, which makes the two ends of the iron wire easy to rust At the same time, the iron wire exposed at both ends of the plastic strip is easy to scratch the mask or food seal, and the production of the plastic strip needs to be covered with polypropylene plastic outside the iron wire, the production process is relatively complicated and the production cost is high, and the plastic strip contains Iron wire, which brings a lot of inconvenience to the recycling of masks and food bags or environmental protection

Method used

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  • Formable polylactic resin composition and preparation method for plastic strip thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 1) Take the following substances in weight percentage: 65.5% PLA resin (4032D, number average molecular weight is 120,000-150,000), 10% HDPE resin (2200J, MFR is 5.5g / 10min), 8% PEG-1000, 5% EVA , 10% CaCO 3 (2500 order), 1% calcium stearate, 0.2% antioxidant 1010 and 0.3% antioxidant 168, add in mixer premixing, stir successively, mixing temperature is 30 ℃, and mixer rotating speed is 500 rev / mins, The mixing time is 5 minutes;

[0062] 2) Put the above-mentioned mixed materials into the injection molding machine, and extrude them into plastic strips with mechanical properties; the thickness of the plastic strips is 1.2mm, and the width is 35mm. The temperature is 165~175℃, 180~190℃, 175~185℃, 175~185℃ respectively;

[0063] 3) Put the plastic strip extruded by the injection molding machine into the cooling water tank, and cool the temperature of the plastic strip to 60-70°C;

[0064] 4) Stretch and roll the above-mentioned cooled plastic strip through a rolling ma...

Embodiment 2

[0067] 1) Take the following substances in weight percentage: 60.4% PLA resin (4042D, number average molecular weight is 120,000-150,000), 15% HDPE resin (2000J, MFR is 4g / 10min), 8% PEG-800, 5% EVA, 10% talcum powder (2500 mesh), 1% calcium stearate, 0.2% antioxidant 1010 and 0.4% antioxidant 168, add to the mixer in turn for premixing and stirring, the mixing temperature is 30°C, and the mixer speed is 300 rev / min, the mixing time is 6 minutes;

[0068] 2) Put the above-mentioned mixed materials into the injection molding machine, and extrude them into plastic strips with mechanical properties; the thickness of the plastic strips is 1.4mm, and the width is 30mm. The temperature is 165~175℃, 180~190℃, 175~185℃, 175~185℃ respectively;

[0069] 3) Put the plastic strip extruded by the injection molding machine into the cooling water tank, and cool the temperature of the plastic strip to 65-75°C;

[0070] 4) Stretch and roll the above-mentioned cooled plastic strip through a r...

Embodiment 3

[0073] 1) Take the following materials in weight percentage: 52.5% PLA resin (4060D, number average molecular weight is 150,000-180,000), 20% HDPE resin (2400J, MFR is 8g / 10min), 8% PEG-400, 8% EVA, 10%CaCO 3 (2000 order), 1% calcium stearate, 0.2% antioxidant 1010 and 0.3% antioxidant 168, add mixer premixing, stirring successively, mixing temperature is 40 ℃, and mixer rotating speed is 450 rev / mins, The mixing time is 3 minutes;

[0074] 2) Put the above-mentioned mixed materials into the injection molding machine, and extrude them into plastic strips with mechanical properties; the thickness of the plastic strips is 1.3mm, and the width is 32mm. The temperature is 165~175℃, 180~190℃, 175~185℃, 175~185℃ respectively;

[0075] 3) Put the plastic strip extruded by the injection molding machine into the cooling water tank, and cool the temperature of the plastic strip to 70-80°C;

[0076] 4) Stretch and roll the above-mentioned cooled plastic strip through a rolling machine...

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Abstract

The invention relates to a formable polylactic resin composition. The composition consists of the following components in percentage by weight: 20 to 70 percent of polylactic resin, 5 to 50 percent of polyethylene resin, 5 to 20 percent of plasticizer, 3 to 20 percent of inorganic filler, 0.5 to 10 percent of compatilizer, 0.1 to 2 percent of lubricating agent and 0.1 to 2 percent of antioxidant.The invention also relates to a method for preparing a plastic strip from the polylactic resin composition. The method comprises the following steps of: A, mixing; B, injection forming; and C, hot-press forming. The polylactic resin composition is biologically degradable, has superior mechanical property, ductility and high roughness and can be used for preparing the formable plastic strip; and the preparation method has the advantages of simple process flow, high processing performance, low cost and capability of realizing large-scale industrial production.

Description

technical field [0001] The invention relates to a modified lactic acid composition, in particular to a polylactic acid resin composition which can be shaped and a preparation method thereof, and belongs to the field of high polymer modification. Background technique [0002] Polylactic acid (PLA) is a fully biodegradable polymer material. The starting material of polylactic acid is starch, the production process is non-polluting, and the product can be decomposed under the action of microorganisms to generate carbon dioxide and water, realizing the cycle in nature, so it is an ideal green polymer material. At the same time, polylactic acid has the same properties as general-purpose plastics, such as processability and mechanical properties, and can be processed in a variety of ways, such as extrusion, spinning, biaxial stretching, and injection blow molding. Therefore, it has a wide range of uses and can be used as packaging materials, fibers and nonwovens. [0003] The te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L23/06C08K13/02C08K3/26C08K3/34
Inventor 邝清林杨军忠姜立忠江枫丹隋轶巍李瑞亢胡衍平
Owner CHINA NAT BLUESTAR (GRP) CO LTD
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