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Blow molded polyvinyl alcohol membrane and production method thereof

A technology of polyvinyl alcohol film and polyvinyl alcohol, applied to flat products, other household appliances, applications, etc., can solve the problems of difficult thermoplastic processing, melting temperature and decomposition temperature are close, and achieve good lubricity and lower melting temperature , the effect of small footprint

Active 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: 50 parts of polyvinyl alcohol (polymerization degree 1000, degree of alcoholysis 72.0 (mol) %), 40 parts of polyethylene glycols, 20 parts of soft water, 0.1 part of oleic acid amide are mixed under stirring state, at 30 ℃ temperature with stirring while heating, stop heating after 10 minutes. 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 120°C, melt and extrude under normal pressure, then cool the material to 20°C, and cut The thermoplastic polyvinyl alcohol resin is obtained by granulating and molding with a granulator. The obtained thermoplastic polyvinyl alcohol resin is heated to a molten state, and subjected to thermoplastic processing by screw extrusion and blow molding to obtain a water-soluble polyvinyl alcohol film at room temperature. The melt-extruded blow-molded film is formed by using a single-screw extrusion blown film machine wit...

Embodiment 2

[0046] Embodiment 2: 55 parts of polyvinyl alcohol (polymerization degree 1000, degree of alcoholysis 80.0 (mol) %), 37 parts of glycerol, 18 parts of soft water, 0.5 part of silicon dioxide are mixed, mix under stirring state, in Heat at 40°C while stirring, and stop heating after 30 minutes. Then put the material into the silo with stirring, use the screw to automatically transport the material to the single-screw extruder, keep the screw temperature at 130°C, melt and extrude under the pressure of 0.01MPa (gauge pressure), and then cool the material To 30 ℃, the thermoplastic polyvinyl alcohol resin is obtained by cutting into pellets with a pelletizer. The obtained thermoplastic polyvinyl alcohol resin is heated to a molten state, and subjected to thermoplastic processing by screw extrusion and blow molding to obtain a water-soluble polyvinyl alcohol film at room temperature. The melt-extruded blow-molded film is formed by using a single-screw extrusion blown film machine...

Embodiment 3

[0049]Embodiment 3: 40 parts of conventional polyvinyl alcohol (polymerization degree 1500, degree of alcoholysis 88.0 (mol) %), 32 parts of triethylene glycol diisocaprylate, 17 parts of soft water, 1 part of talcum powder are mixed, in stirring state Mix evenly under low temperature, heat while stirring at a temperature of 50°C, and stop heating after 60 minutes. Then put the material into the silo with stirring, and use a single screw to automatically transport the material to the single-screw extruder, keep the screw temperature at 130°C, melt and extrude it under normal pressure, and then cool the material to 35°C, The thermoplastic polyvinyl alcohol resin is obtained by pelletizing with a pelletizer. The obtained thermoplastic polyvinyl alcohol resin is heated to a molten state, and subjected to thermoplastic processing by screw extrusion and blow molding to obtain a water-soluble polyvinyl alcohol film at room temperature. The melt-extruded blow-molded film is formed b...

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Abstract

The invention provides a polyvinyl alcohol membrane. The polyvinyl alcohol membrane is produced through blow molding of melt-processible polyvinyl alcohol resin, the tensile strength of the polyvinyl alcohol membrane is not lower than 20 MPa, the melt-processible 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 72 (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 method has the advantages of simple process, less device investment, small occupied area, and realization of blow molding of normal-temperature, medium-temperature and high-temperature water soluble membranes. The method is mainly used for producing double-layer membranes, and the membranes can be directly processed to produce various water-soluble bags, and the water-soluble bags are used in the field of medium and low end packaging application, and can be used as a pesticide and chemical engineering product inner packaging liner bag, a hospital washing packaging bag and a refuse bag.

Description

technical field [0001] The invention relates to a blow-molded polyvinyl alcohol film, in particular to a polyvinyl alcohol film in the field of medium and low-end packaging applications. 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, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L71/02C08K5/20C08K5/053C08K3/36C08K5/103C08K3/34C08K13/02C08K5/11B29D7/01
Inventor 李莉黎园王琪雷德松吴春林
Owner CHINA PETROCHEMICAL CORP
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