Polylactic acid hot molding method

A molding method and technology of polylactic acid, which is applied in the field of thermal molding of polylactic acid, can solve problems such as heat resistance and demoulding, and achieve the effects of protecting the environment, reducing carbon emissions, and being widely used

Active Publication Date: 2012-08-01
浙江启泰生物材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a thermal molding method of polylactic acid, which can solve the problems of heat resistance and difficult demoulding of polylactic acid (PLA) sheets after molding

Method used

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Embodiment Construction

[0019] The thermal molding method of polylactic acid of the present invention adopts a forming mold, and the inner surface of the forming mold is sprayed with an anti-sticking coating; the anti-sticking coating can be a Teflon layer formed by nano-spraying, thereby effectively solving the problem of polylactic acid under high temperature. Adhesion problems to the inner surface of the mold;

[0020] The thermoforming method includes the following steps:

[0021] The first step is to heat the first preheating box and the preheating roller, so that the temperature of the first preheating box is controlled at 70-130°C, so that the preheating roller is heated evenly, so that the crystallization of polylactic acid is sufficient;

[0022] Heating the forming mold so that the inner surface of the forming mold is in a constant temperature state of 80-110°C;

[0023] The heating method of the forming mold can be oil heating or electric heating;

[0024] In the second step, the raw mat...

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Abstract

The invention discloses a polylactic acid hot molding method. A mold is adopted and an anti-sticking coating layer is sprayed on the internal surface of the mold. The polylactic acid hot molding method comprises the following steps of: 1) heating a first preheating box and a preheating roll, wherein the temperature of the first preheating box is controlled to be 70-130 DEG C; and heating the mold, wherein the temperature of the internal surface of the mold is kept to be 80-110 DEG C; 2) fermenting raw materials into lactic acid, polymerizing the lactic acid into polylactic acid and feeding the polylactic acid into a tunnel caterpillar blister positive-pressure and negative-pressure hot molding machine to form sheets; and 3) conveying the sheets to a second preheating box for crystallization, when the polylactic acid sheets reach a critical point of hot molding crystallization and the crystallization degree reaches 10-20 percent, feeding the polylactic acid sheets into the mold to realize hot molding, and molding the polylactic acid through positive-pressure and negative-pressure blister molding to obtain polylactic acid products with the crystallization degree being 20-30 percent and heat-resistant temperature being higher than 90 DEG C. The polylactic acid hot molding method provided by the invention has the advantages that the polylactic acid materials can be used more widely, the carbon emission is reduced and the environment is protected.

Description

technical field [0001] The invention relates to a production method of polylactic acid, in particular to a thermal molding method of polylactic acid. Background technique [0002] Polylactic acid (PLA) technology uses natural plants such as corn and cassava as raw materials. After fermentation and emulsification, it adopts polymerization technology to form a degradable polymer material. Its products can widely replace traditional petroleum-based plastic products. [0003] At present, molds for thermal molding of polylactic acid are made of alloys. When casting molds for polylactic acid, the temperature of heating polylactic acid should not be too high. If it is too high, polylactic acid will adhere to the inner surface of the mold and the product cannot be formed. , that is, a higher crystallinity cannot be achieved without a higher constant temperature state, which makes the molded polylactic acid product unable to reach a high temperature resistant state. [0004] Since t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C51/10B29C51/26B29C51/42
Inventor 陈辉
Owner 浙江启泰生物材料有限公司
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