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Biaxial orienting drawing formed polyvinyl alcohol membrane and production method thereof

A technology of polyvinyl alcohol film and polyvinyl alcohol, which is applied in the field of high-end packaging applications, can solve the problems of close melting temperature and decomposition temperature, difficult thermoplastic processing, etc., and achieve excellent processing fluidity, good formability, and small footprint Effect

Inactive Publication Date: 2016-12-07
CHINA PETROCHEMICAL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since polyvinyl alcohol has a polyhydric structure, there are strong intermolecular and intramolecular hydrogen bond forces, so that the melting temperature is very close to the decomposition temperature, making it difficult to perform thermoplastic processing

Method used

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  • Biaxial orienting drawing formed polyvinyl alcohol membrane and production method thereof
  • Biaxial orienting drawing formed polyvinyl alcohol membrane and production method thereof
  • Biaxial orienting drawing formed polyvinyl alcohol membrane and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Example 1: 50 parts of polyvinyl alcohol (polymerization degree 2000, degree of alcoholysis 95.0 (mol) %), 6 parts of triethylene glycol diisocaprylate, 5 parts of soft water, 0.1 part of saturated aliphatic dicarboxylic acid ester G32 Mix well under stirring state, heat at 90°C while stirring, stop heating after 7h. Then put the material into the silo with stirring, use the screw to automatically transport the material to the screw extruder, keep the screw temperature at 200°C, melt and extrude under normal pressure, then cool the material to 40°C, and cut Granular melt-processable polyvinyl alcohol resin is produced by granulating and molding by a granulator. The obtained thermoplastic polyvinyl alcohol resin is heated to a molten state, extruded by a screw and biaxially stretched, and subjected to thermoplastic processing to form a polyvinyl alcohol film. Biaxially stretched film is formed by single-screw melt extrusion to form a thin sheet, and then biaxially stret...

Embodiment 2

[0043] Embodiment 2: 85 parts of polyvinyl alcohol (polymerization degree 2400, alcoholysis degree 97.0 (mol) %), 20 parts of polyethylene glycol, 20 parts of glycerol, 20 parts of soft water, 10 parts of silicon dioxide, 5 parts Oleic acid amide was mixed evenly under stirring, and heated while stirring at a temperature of 30°C, and stopped heating after 10 hours. Then put the material into the silo with stirring, use the screw to automatically transport the material to the single-screw extruder, keep the temperature of the screw at 120°C, melt and extrude the material under the pressure of 0.01MPa (gauge pressure), and then cool the material To 20 ℃, through pelletizer pelletizing and molding to produce polyvinyl alcohol resin that can be melt-processed. The obtained thermoplastic polyvinyl alcohol resin is heated to a molten state, extruded by a screw and biaxially stretched, and subjected to thermoplastic processing to obtain a high-temperature water-soluble polyvinyl alco...

Embodiment 3

[0046] Embodiment 3: with 70 parts of conventional polyvinyl alcohol (polymerization degree 1000, degree of alcoholysis 99.9 (mol) %), 30 parts of polyethylene glycols, 16 parts of soft water, 7 parts of saturated aliphatic dicarboxylic acid ester G36, 3 parts Mix the silica evenly, heat at 55°C for 2h, and then stop heating. Then put the material into a single-screw extruder, keep the screw temperature at 145°C, melt and extrude it under normal pressure, then cool the material to 25°C, and pelletize it with a pelletizer to obtain a melt-processable polyvinyl alcohol resin . The obtained thermoplastic polyvinyl alcohol resin is heated to a molten state, extruded by a screw and biaxially stretched, and subjected to thermoplastic processing to obtain a high-temperature water-soluble polyvinyl alcohol film. mentioned. Biaxially stretched film is formed by single-screw melt extrusion to form a thin sheet, and then biaxially stretched to form a film. The aspect ratio of the scre...

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Abstract

The invention provides a polyvinyl alcohol membrane. The polyvinyl alcohol membrane is produced through melt extrusion-biaxial orientating drawing formation of melt-processible polyvinyl alcohol resin, the tensile strength of the polyvinyl alcohol membrane is not lower than 40 MPa, the polyvinyl alcohol resin comprises effective amounts of polyvinyl alcohol, a plasticizer, soft water and a processing assistant, the degree of polymerization (DP) of the polyvinyl alcohol is 1000-3500, the degree of hydrolysis (DH) of the polyvinyl alcohol is greater than 95 (mol)% and is smaller than 99.9 (mol)%, the plasticizer is at least one of glycerol, polyethylene glycol and triethylene glycol di-2-ethylhexoate, and the processing assistant is at least one of talcum powder, silica, oleamide and saturated aliphatic dicarboxylate. The polyvinyl alcohol membrane has the advantages of simple technology, less device investment and less occupied area. The polyvinyl alcohol membrane can be used in the field of high-end packaging, such as packaging of high-end clothes and packaging of foods and oil products, and can prolong the shelf life of the foods.

Description

technical field [0001] The invention relates to a biaxially stretched polyvinyl alcohol film, in particular to a polyvinyl alcohol film in the high-end packaging application field. Background technique [0002] PVA film preparation methods include solution casting method and melt extrusion film blowing method, which are called wet method and dry method respectively. The process of solution casting method is long, the product quality is not easy to control, the film yield is low, the energy consumption is high, the equipment investment is large, the weather resistance of the prepared PVA film is not good, and when the humidity is low in winter, the film is easy to become brittle, curl and deform; When the humidity is high in summer, the film is sticky and the size is unstable. [0003] Melt extrusion film forming is a dry film-making process in which PVA is mixed and granulated with some processing aids, and then melt-extruded to form a film. The process is simple, the film...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08L71/02C08K13/02C08K5/103C08K5/11C08K5/053C08K3/36C08K5/20C08K3/34C08K5/098C08K3/38C08K3/16
Inventor 王琪李莉黎园吴春林雷德松
Owner CHINA PETROCHEMICAL CORP
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