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Preparation of water resistant polyvinyl alcohol biodegradable film through melt extrusion method

A biodegradable and water-resistant technology, applied in the field of water-resistant polyvinyl alcohol biodegradable films, can solve the problems of poor processing performance and poor water resistance, and achieve the effect of good processing performance and improved mechanical properties.

Inactive Publication Date: 2011-11-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is characterized by solving the problems of poor water resistance and poor processing performance of PVA film, and improving the water resistance of PVA film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 40 parts of glycerin and 20 parts of polylactic acid to 100 parts of PVA, first put 100 parts of PVA into a high-speed mixer, heat up the PVA resin powder to 80°C, then slowly and evenly add the plasticizer glycerin, and stir at a low speed for 60 minutes The temperature is controlled between 80°C and 110°C. After PVA fully absorbs glycerin, it is discharged after being mixed with polylactic acid, left to mature for 24 hours, and then the mixture is extruded and granulated through a twin-screw extruder. The prepared pellets are melt-extruded and blow-molded by a single-screw extruder to prepare a water-resistant PVA biodegradable film. The blown film has a folded diameter of 500mm, a thickness of 40μm, a tensile strength of 20.4Mpa, and a tear strength of 50.4Mpa. After soaking in water for 24 hours, the measured tensile strength is 13.4Mpa.

Embodiment 2

[0023] Add 40 parts of glycerin, 20 parts of polylactic acid, and 1 part of TDI to 100 parts of PVA. First, put 100 parts of PVA into a high-speed mixer to heat up the PVA resin powder to 70°C, and then slowly and evenly add plasticizer glycerin , stirring at a low speed for 60 minutes and controlling the temperature between 80°C and 110°C. After the PVA fully absorbs glycerin, it is discharged after being mixed with polylactic acid and TDI, left to mature for 24 hours, and then the mixture is extruded and granulated through a vented single-screw extruder. The prepared pellets are melt-extruded and blow-molded by a single-screw extruder to prepare a water-resistant PVA biodegradable film. The folded diameter of the blown film is 500 mm, the thickness is 40 μm, the tensile strength is 21.6 Mpa, the tear strength is 61.3 Mpa, and the tensile strength measured after soaking in water for 24 hours is 20.3 Mpa.

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Abstract

The invention relates to a formula and a process for preparing water resistant polyvinyl alcohol biodegradable film through a melt extrusion and blow molding processing method. The process is characterized by: uniformly mixing polyvinyl alcohol and various assistants through a specific mixing method; carrying out extruding and granulating through a twin-screw extruder; carrying out melt extrusion through a single screw extruder to prepare the water resistant polyvinyl alcohol biodegradable film. The preparation process for the water resistant polyvinyl alcohol biodegradable film has the following advantages that: the melt extrusion and blow molding processing method is adopted; compared to the traditional tape casting method, the process provided by the present invention has high continuous degree, short production period, stable process, and the prepared water resistant polyvinyl alcohol biodegradable film has adjustable thickness and folding diameter; the water resistance and processability of the polyvinyl alcohol film are improved through adding a crosslinking agent, a processing modifier and the like, such that each performance of the prepared film provided by the present invention are excellent, and the prepared water resistant polyvinyl alcohol biodegradable film can be widely applicable for packaging industries such as food, daily chemical products, pharmaceutical electronic components and the like.

Description

1. Technical field [0001] The invention relates to a formula and a process of a water-resistant polyvinyl alcohol (PVA) biodegradable film, which is prepared by a melting extrusion blow molding method and belongs to the field of polymer material processing. 2. Background technology [0002] PVA is water-soluble and safe and non-toxic. As a packaging film material, it is widely used in food, daily chemical, pharmaceutical, electronic component packaging and other industries. As a packaging material, PVA film is better than polyolefin film in terms of transparency, antistatic, oil resistance, organic solvent resistance, and printability compared with general packaging materials. In recent years, due to the special requirements of biodegradable plastics for water resistance, the development of PVA films has a new direction. [0003] Due to the large number of hydroxyl groups in the PVA molecule, there are strong hydrogen bonds in the PVA molecule and between the molecules, and...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08L3/02C08L3/04C08L67/04C08L75/04C08L67/00C08K5/053C08K5/3412C08K5/07C08K3/38C08K5/29B29C49/04
Inventor 苑会林张振宇
Owner BEIJING UNIV OF CHEM TECH
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