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Preparation method of high-rate polylactic acid foaming sheet

A polylactic acid foaming and high-magnification technology, which is applied to flat products, other household appliances, household appliances, etc., can solve the problems of low apparent density, easy perforation of materials, difficulty in controlling foam size and foaming ratio, and achieve Uniform cell diameter, uniform sheet thickness, easy control of foam size and expansion ratio

Active Publication Date: 2019-05-17
CHTC BIO BASED MATERIAL ENG & TECH NINGBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] (2) It is difficult to control the foam size and expansion ratio, the cell diameter is not uniform, and the sheet thickness is not uniform
[0013] (3) The foamed material prepared by the existing technology has low apparent density and low mechanical strength, and the material is easy to perforate and break the foam during production

Method used

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  • Preparation method of high-rate polylactic acid foaming sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Primary extrusion

[0050] Measure 88 parts of polylactic acid and 2 parts of nucleating agent talcum powder in parts by mass, and inject them into the first-stage screw extruder. After the melt is plasticized and mixed in the first-stage extrusion, 5 Parts, 5 parts of auxiliary nitrogen are injected into the first-stage extruder, the injection pressure of foaming agent is at 18Mpa, and the injection pressure of nitrogen is at 11Mpa. Set the temperature of each section of the first-stage screw extruder, from the feeding to the machine neck, the temperature of the first zone is 180°C, the temperature of the second zone is 182°C, the temperature of the third zone is 190°C, the temperature of the fourth zone is 195°C, and the temperature of the fifth zone is 200°C, the temperature in the sixth zone is 200°C, the temperature in the seventh zone is 200°C, the temperature in the eighth zone is 200°C, the temperature in the ninth zone is 200°C, the temperature in the tenth...

Embodiment 2

[0062] (1) Primary extrusion

[0063] Measure 90 parts of polylactic acid and 2 parts of nucleating agent talcum powder in parts by mass, and inject them into the primary screw extruder. After the melt is plasticized and mixed in the primary extrusion, the blowing agent trifluorotrichloroethane 4 parts and 4 parts of auxiliary nitrogen are injected into the first-stage screw extruder, the injection pressure of foaming agent is 18Mpa, and the injection pressure of nitrogen is 12Mpa. Set the temperature of each section of the first-stage screw extruder, from the feeding to the machine neck, the temperature of the first zone is 182°C, the temperature of the second zone is 182°C, the temperature of the third zone is 190°C, the temperature of the fourth zone is 195°C, and the temperature of the fifth zone is 200°C, the temperature in the sixth zone is 200°C, the temperature in the seventh zone is 200°C, the temperature in the eighth zone is 200°C, the temperature in the ninth zone ...

Embodiment 3

[0072] (1) Primary extrusion

[0073] Measure 91 parts of polylactic acid and 2 parts of nucleating agent talcum powder into the first-stage screw extruder according to the number of parts by mass. After the melt is plasticized and mixed in the first-stage extrusion, 3.5 Parts, 3.5 parts of auxiliary nitrogen are injected into the first-stage screw extruder, the injection pressure of foaming agent is at 18Mpa, and the injection pressure of nitrogen is at 14Mpa. Set the temperature of each section of the first-stage screw extruder, from the feeding to the machine neck, the temperature of the first zone is 185°C, the temperature of the second zone is 188°C, the temperature of the third zone is 190°C, the temperature of the fourth zone is 195°C, and the temperature of the fifth zone is 200°C, the temperature in the sixth zone is 200°C, the temperature in the seventh zone is 200°C, the temperature in the eighth zone is 200°C, the temperature in the ninth zone is 200°C, the tempera...

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Abstract

The invention provides a preparation method of a high-rate polylactic acid foaming sheet. The preparation method comprises the steps of primary extrusion, secondary extrusion, and extrusion of the foaming sheet; and the high-rate polylactic acid foaming sheet is prepared from the following raw material components in parts by weight: 88-94 parts of polylactic acid, 1-2 parts of a nucleating agent,2-5 parts of a foaming agent, and 2-5 parts of an auxiliary. The difficulties of low foaming rate, low strength and the like due to use of carbon dioxide in industrial production are effectively solved, and the prepared polylactic acid sheet with the high foaming rate and excellent surface performance can be used in the fields such as food packaging and disposable full-degradable meal boxes.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid foaming, and in particular relates to a method for preparing a high-magnification polylactic acid foaming sheet. Background technique [0002] In response to the explosive growth of the express delivery industry in recent years and the pollution caused by the packaging waste generated, in 2016, the State Post Bureau issued the "Implementation Plan for Promoting the Packaging of the Green Express Industry". The National Standards Committee issued a series of national standards for "Express Packaging Products". According to the requirements of reduction, greening, and recyclability, new requirements were put forward for the reduction of express packaging, requiring that express packaging bags should be made of biodegradable plastics to reduce white pollution. 2018 is the tenth year since the "Plastic Restriction Order" was issued. The website of the National Development and Reform Commission...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K3/34C08J9/14
CPCC08L67/04B29C44/50B29K2067/046B29C44/5627B29C44/08C08J2201/03C08J2367/04C08J9/0066C08J9/144C08J2203/142C08J2203/06B29C48/022B29L2007/00B29C48/07B29C48/0012B29C48/385B29C48/295B29C48/298B29C48/92B29C2948/92704B29C2948/92857B29C48/144B29C48/9135B29C48/38B29C44/3415B29C44/5672C08J9/148C08K3/34
Inventor 黄伟伟王乐军宋亚男郑宗强刘怡宁
Owner CHTC BIO BASED MATERIAL ENG & TECH NINGBO CO LTD
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