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Melt extrusion-casting/calendering molded polyvinyl alcohol membrane and production method thereof

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

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 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 then subjected to thermoplastic processing by means of screw extrusion and calendering to prepare a water-soluble polyvinyl alcohol film at room temperature. The calender film forming adopts single-screw melt extrusion calender film forming equi...

Embodiment 2

[0045] 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 then subjected to thermoplastic processing by means of screw extrusion and calendering to prepare a water-soluble polyvinyl alcohol film at room temperature. The calender film forming adopts single-screw melt extrusion calender film forming ...

Embodiment 3

[0048] 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 is subjected to thermoplastic processing through screw extrusion and casting to form a normal temperature water-soluble polyvinyl alcohol film. The cast film-forming equipment adopts single...

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PUM

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Abstract

The invention provides a polyvinyl alcohol membrane. The polyvinyl alcohol membrane is produced through casting or calendering molding of melt-processible polyvinyl alcohol resin, the tensile strength of the polyvinyl alcohol membrane is not lower than 25 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 95 (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. A production method of the polyvinyl alcohol membrane has the advantages of simple process, less device investment, small occupied area, and formation of normal-temperature and medium-temperature water-soluble membranes through melt extrusion casting / calendering. The method is mainly used for producing single-layer membranes which are applied to the fields of hydrographics transfer printing base membranes, printing paper hot melt adhesive membranes, agricultural membranes and other medium-and-high end products.

Description

technical field [0001] The invention relates to a polyvinyl alcohol film formed by melt extrusion-flow / calendering, in particular to a polyvinyl alcohol film in the field of medium and high-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 f...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08L71/02C08K13/02C08K5/20C08K5/053C08K3/36C08K5/103C08K3/34C08K5/11C08K3/16C08K5/098C08K3/38B29D7/01
Inventor 吴春林廖永康李莉黎园王琪
Owner CHINA PETROCHEMICAL CORP
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