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A kind of polylactic acid biaxially stretched frosted film and preparation method thereof

A biaxially stretched, polylactic acid technology, applied in the field of polylactic acid biaxially stretched frosted film and its preparation, can solve the problems of increased film production cost, rough film surface, etc., and achieves the effects of strong decoration and cost reduction.

Active Publication Date: 2016-01-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the frosted film is prepared by post-processing methods, such as printing, embossing, roughening, etc., to make the surface of the film rough, so that light forms diffuse reflection on the surface of the film, and the haze value is maintained while maintaining a relatively high light transmittance. Due to the increase of post-processing procedures, there are higher requirements for film production equipment, production technology and operators, which will greatly increase the cost of film production

Method used

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  • A kind of polylactic acid biaxially stretched frosted film and preparation method thereof
  • A kind of polylactic acid biaxially stretched frosted film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~6

[0043] The polylactic acid resin was vacuum-dried at 80°C for 10 hours, and 100 parts by weight of the dried polylactic acid resin was mixed with different parts by weight of polyethylene glycol (PEG) in a high-speed mixer, and the mixed material was added to the twin-screw extruder. In the machine, the twin-screw extruder is melted and extruded at 170~190°C to granulate, the screw speed is set at 300rpm, and the obtained pellets are vacuum-dried at 62°C for 48 hours.

[0044] The dried pellets are added to the tape casting machine and cast into a thick sheet of 400~500μm. The temperature in the first barrel area (feeding section) of the tape casting machine is set to 180°C to facilitate the softening of the pellets, and the tape is cast into a tablet. The melt blending temperature is 205°C, the discharge end temperature is 200°C, the cooling roll temperature is 45°C, the cast thick sheet is cut into a square sheet of 91×91mm, and the KaroIV film biaxial tensile testing machine...

Embodiment 7~8

[0047] The polylactic acid resin was vacuum-dried at 80°C for 10 hours, and 100 parts by weight of the dried polylactic acid resin and different parts by weight of ethylene bisstearamide (EBS) were mixed evenly in a high-speed mixer, and the mixed materials were added to the twin-screw extruder. In the extruder, the twin-screw extruder is melted and extruded at 170-190°C to make granules, the screw speed is set at 300rpm, and the obtained pellets are vacuum-dried at 62°C for 48 hours.

[0048] The dried pellets are added to the tape casting machine and cast into a thick sheet of 500μm. The temperature in the first barrel area (feeding section) of the tape casting machine is set to 190°C to facilitate the softening of the pellets and the melting of the cast tablet. The blending temperature is 210°C, the discharge end temperature is 205°C, and the cooling roll temperature is 45°C. The cast thick sheet is cut into a square sheet of 91×91mm, and the film is biaxially stretched by a...

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Abstract

The invention provides a polylactic acid bidirectional stretching matte thin film and a preparation method thereof, and relates to the technical field of resin thin film. The thin film comprises the following blended components: 100 parts by weight of polylactic acid resin, and 0.2-10 parts by weight of a modifying auxiliary agent. The weight-average molecular weight of the polylactic acid resin is 70000-250000, and the molecular weight dispersity is 1.5-2.2; the modifying auxiliary agent is at least one of the following substances: polyethylene glycol, polyglycerol, pentaerythritol, stearic acid, stearate, butyl stearate, monoglycerol stearate, octadecanamide, ethylene bisstearamide, and oxidized polyethylene. The polylactic acid bidirectional stretching matte thin film is prepared by carrying out melt blending granulation of the components according to the amount, carrying out casting tabletting, and carrying out bidirectional stretching. The light transmittance of the thin film is more than or equal to 93%, the haze is more than or equal to 70%, and the surface gloss is less than or equal to 10; and the thin film has pearlescent luster and matte texture, has quite good decorative effects, and can be used for packaging and film pasting.

Description

technical field [0001] The invention relates to a polylactic acid frosted film in the technical field of resin films, and furthermore relates to a polylactic acid biaxially stretched frosted film and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a bio-based polymer, which is derived from renewable natural resources, has complete biodegradability and good biocompatibility, good physical and mechanical properties and processing properties, and is suitable for processing Injection products, foaming materials, films, fibers, etc., are mainly used in the fields of biomedicine and food packaging. Under the current concept of advocating energy saving, environmental protection, green and low carbon. Polylactic acid, which can be completely biodegraded and returned to nature, has attracted more and more attention. [0003] Packaging materials are currently a good direction for the development and application of polylactic acid. Films account f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L71/08C08L23/30C08K5/20C08K5/103C08K5/053C08K5/09C08K5/098C08K5/101B29D7/01
Inventor 张丽英张浩张师军徐凯高达利徐萌刘建叶邵静波吕芸
Owner CHINA PETROLEUM & CHEM CORP