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Transparent crystallization polylactic acid plastic and preparation method thereof

A technology for crystallizing polylactic acid and polylactic acid, applied in the field of plastic materials, can solve the unsolved problems of preparing transparent and heat-resistant polylactic acid, and achieve the effects of size change, heat resistance and crystallinity improvement, and crystal nucleus size reduction.

Active Publication Date: 2011-06-08
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Up to now, there are few reports about the method of preparing transparent heat-resistant polylactic acid at home and abroad, and the technical problems of preparing transparent heat-resistant polylactic acid have not yet been solved.

Method used

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  • Transparent crystallization polylactic acid plastic and preparation method thereof
  • Transparent crystallization polylactic acid plastic and preparation method thereof
  • Transparent crystallization polylactic acid plastic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 500 grams of polylactic acid (2002D, LD mixed type, Nature Works), 5 grams of ethylene bis-12-hydroxystearamide crystal nucleating agent, 50 grams of acetyl tributyl citrate plasticizer, 15 grams of other additives: Antioxidant 1010 and stearate (antioxidant 1010 2.5 grams, lubricant aluminum stearate 12.5 grams), in the high mixer that rotating speed is 1500 rev / mins, carry out premixing and carry out melt extrusion then, melt extrusion The temperature is 190-200°C, and the extrusion temperatures of the first to sixth stages are 190°C, 192°C, 194°C, 195°C, 198°C, and 200°C. The obtained pellets were injected into standard specimens for testing of light transmittance, tensile strength, half-crystallization time and heat resistance. The half-crystallization time is 1.34 minutes, the tensile strength is 64Mpa, the light transmittance is 84.7%, and the heat resistance (HDT) is 98°C.

Embodiment 2

[0037] 500 grams of polylactic acid (2002D, LD mixed type, Nature Works), 2.5 grams of ethylene bis-12-hydroxystearamide crystal nucleating agent, 5 grams of acetyl tributyl citrate plasticizer, 15 grams of other additives: Antioxidant 1010 and stearate (antioxidant 1010 2.5 grams, lubricant aluminum stearate 12.5 grams), in rotating speed is that 1500 rev / min high mixers carry out premixing and then carry out melt extrusion, melt extrusion temperature It is 190-200°C, and the extrusion temperatures of the first to sixth stages are 190°C, 192°C, 194°C, 195°C, 198°C, and 200°C. The obtained pellets were injected into standard specimens for testing of light transmittance, tensile strength, half-crystallization time and heat resistance. The half-crystallization time is 4.3 minutes, the tensile strength is 57Mpa, the light transmittance is 63.7%, and the heat resistance (HDT) is 63°C.

Embodiment 3

[0039]500 grams of polylactic acid (2002D, LD mixed type, Nature Works), 10 grams of ethylene bis-12-hydroxystearamide crystal nucleating agent, 25 grams of acetyl tributyl citrate plasticizer, 15 grams of other additives: Antioxidant 1010 and stearate (antioxidant 1010 2.5 grams, lubricant aluminum stearate 12.5 grams), in rotating speed is that 1500 rev / min high mixers carry out premixing and then carry out melt extrusion, melt extrusion temperature It is 190-200°C, and the extrusion temperatures of the first to sixth stages are 190°C, 192°C, 194°C, 195°C, 198°C, and 200°C. The obtained pellets were injected into standard specimens for testing of light transmittance, tensile strength, half-crystallization time and heat resistance. The half-crystallization time is 2.1 minutes, the tensile strength is 62Mpa, the light transmittance is 78.2%, and the heat resistance (HDT) is 65°C.

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Abstract

The invention discloses a transparent crystallization polylactic acid plastic which comprises the following raw materials in parts by weight: 100 parts of polyactic acid, 0.1-5 parts of crystallization nucleating agents, 0.5-20 parts of plasticizers and 0.5-10 parts of other assistants. By adding the crystallization nucleating agents and the plasticizers, the crystallinity, the crystallizing speed and the heat resistance of the plastic are obviously improved, and the crystal nucleus size of the plastic is obviously reduced so that the transparent crystallization polylactic acid plastic has the characteristics of high transparence, heat resistance and tensile strength. The invention also discloses a preparation method of the transparent crystallization polylactic acid plastic, which comprises the following steps of: blending the polyactic acid, the crystallization nucleating agents, the plasticizers and the other assistants, and then carrying out injection moulding to obtain the crystallization polylactic acid plastic. The crystallization polylactic acid plastic prepared with the method can be directly subjected to injection moulding without secondary annealing moulding so that the preparation method has the advantages of simplicity in operation, strong maneuverability, low production cost and easiness for industrial production.

Description

technical field [0001] The invention relates to the field of plastic materials, in particular to a transparent crystalline polylactic acid plastic and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a kind of bio-based macromolecule degradable material widely used, which is prepared from renewable biological resources through chemical synthesis. PLA has excellent characteristics such as good mechanical properties, non-toxicity, low relative density, easy processing and molding at room temperature, fully biodegradable, and relatively low price. An active variety; it can be widely used in chemical industry, light industry, automobile manufacturing, home appliances, packaging materials, etc., and is constantly expanding new application fields. However, compared with general-purpose plastics such as conventional PVC and PS, ordinary polylactic acid plastics have the disadvantages of poor heat resistance, slow crystallization speed, long mold...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K5/00C08K5/20C08K5/11C08K5/134C08K5/098
Inventor 朱锦汤兆宾张传芝
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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