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Polylactic acid foamed sheet and preparation method thereof

A technology of polylactic acid foaming and polylactic acid, which is applied in the field of polylactic acid foam sheet and its preparation, can solve the problems of polylactic acid foam sheet foaming unevenness, complicated preparation process, and uncontrollable cost, and achieve good results Industrial use value, good cell structure, and the effect of cell diameter

Inactive Publication Date: 2019-06-07
COFCO GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the polylactic acid foamed sheet obtained at present still has defects such as uneven foaming, poor foaming performance, low expansion ratio, uncontrollable cost, and complicated preparation process. It is necessary to develop a new polylactic acid foamed sheet and its preparation method

Method used

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  • Polylactic acid foamed sheet and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Add 98.8 parts of dry polylactic acid pellets, 1.0 parts of nucleating agent diphenyl dihydrazide sebacic acid, and 0.2 parts of chain extender 1,4-butanediol to a twin-screw extruder. In the extruder (model TDS-75D), after melt mixing (screw temperature 170-195°C) in a twin-screw extruder (screw diameter 75mm; aspect ratio 52:1), water cooling, pelletizing and drying Finally, polylactic acid foamed modified resin is obtained.

[0042] (2) Put the obtained polylactic acid foamed modified resin into the hopper of the foaming extruder formed by the two-stage extrusion system connected in series, wherein, the screw diameter of the one-stage extrusion system is φ90mm, and the length-to-diameter ratio is 32 : 1; the diameter of the screw of the secondary extrusion system is φ120mm, and the aspect ratio is 34:1. After the primary extrusion system is melted and plasticized, the blowing agent CCl is injected 3 F, the flow rate is 23.5kg / h, and the low-temperature homogeneo...

Embodiment 2

[0046] (1) Add 98.8 parts of dry polylactic acid pellets, 1.0 parts of nucleating agent diphenyl dihydrazide sebacic acid, and 0.2 parts of chain extender 1,4-butanediol to a twin-screw extruder. In the extruder (model TDS-75D), after melting and mixing (screw temperature: 170-195°C) in a twin-screw extruder (screw diameter: 75mm; aspect ratio: 52:1), water cooling, pelletizing, and drying , to obtain polylactic acid foamed modified resin.

[0047] (2) Put the obtained polylactic acid foamed modified resin into the hopper of the foaming extruder formed by the two-stage extrusion system connected in series, wherein, the screw diameter of the one-stage extrusion system is φ90mm, and the length-to-diameter ratio is 32 : 1; the diameter of the screw of the secondary extrusion system is φ120mm, and the aspect ratio is 34:1. After the primary extrusion system is melted and plasticized, the blowing agent CCl is injected 3 F, the flow rate is 28.5kg / h, and the low-temperature homogen...

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Abstract

The invention relates to a polylactic acid foamed sheet and a preparation method thereof. The foaming ratio of the polylactic acid foamed sheet is 20 to 30 times; the pore density is 10.2-13.4*10<9> pores for each cubic centimeter; the diameter of pores is 4 to 15 [mu]m, and the thermal deformation temperature is 95 to 105 DEG C. According to the preparation method, polylactic acid is taken as thematrix, a nucleating agent and a chain extender are added to obtain a mixture; the mixture is extruded in a double screw extruder to obtain polylactic acid foamed modified resin; then the modified resin and optionally picked color master batch are added into the hopper of a foaming extruder composed of two extrusion systems, which are serially connected; the mixture is melted and plasticized in the primary extruding system, then a foaming agent is added, then the mixture is mixed and cooled in the secondary extruding system to obtain low temperature homogenous melt; the melt is extruded fromthe head of a controllable foaming machine, and finally the foamed sheet is obtained after sizing cooling, part spreading, and rolling. The provided polylactic acid foamed sheet has the advantages ofhigh foaming ratio, good foaming performance, good heatproof property, good pore structure, simple technology, and controllable cost.

Description

technical field [0001] The invention relates to a polylactic acid foam sheet and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] With the rapid development of the national economy, the use of polymer materials has penetrated into all areas of people's lives, bringing great convenience to our lives. However, at present, many polymer materials are discarded after use and are difficult to degrade in nature, resulting in serious environmental pollution problems. With the increasing shortage of petroleum resources, people's high attention to environmental issues and the improvement of life quality requirements, the development of fully biodegradable polymer materials has become a research hotspot at home and abroad. [0003] Polylactic acid (PLA) is a fully biodegradable polymer material. This type of material is discarded in nature after use, and can be degraded to H2O3 under the action of microorganisms in nature. 2 O a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/06C08K5/25C08J9/14C08G18/42C08G18/32
Inventor 佟毅靳喜庆白岚李义叶新建刘志刚杨凯张媛
Owner COFCO GROUP
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