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A kind of melt processable polyvinyl alcohol composition and preparation method thereof

A polyvinyl alcohol and melt processing technology, applied in the field of material processing, can solve the problems of lowering the processing temperature of PVA resin, lowering the thermal decomposition temperature performance, easy migration of plasticizers, etc. The effect of improving the surface topography

Active Publication Date: 2017-08-01
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent of CN1368515A discloses a new speed-increasing method for thermoplastic processing of polyvinyl alcohol film. This method mainly selects a polymerizable amide monomer as a plasticizer, and controls more water in the resin to combine The form of water exists, thereby effectively reducing the processing temperature of PVA resin, but the plasticizer selected by this method is easy to migrate, and has certain toxicity, so that the prepared film is not suitable for food packaging film
Although the above method has realized the thermoplastic processing of polyvinyl alcohol, its thermal decomposition temperature performance is reduced

Method used

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  • A kind of melt processable polyvinyl alcohol composition and preparation method thereof
  • A kind of melt processable polyvinyl alcohol composition and preparation method thereof
  • A kind of melt processable polyvinyl alcohol composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 94g of polyvinyl alcohol (Sinopec Great Wall Energy Chemical Ningxia Co., Ltd., brand 1799) and 900g of distilled water and heat to dissolve at 95°C, then add 6g of propylene glycol, 5g of hydroxytyrosol, and 0.5g of calcium chloride into the solution and stir to mix evenly. Then pour the mixed solution into a container, vacuum dry at 60°C to obtain a dry mixture, then put the dried mixture into a single-screw extruder, directly extrude and granulate, and obtain a thermoplastic polyvinyl alcohol combination Wherein, the screw temperature is 230°C, the screw speed is 100rpm, the die temperature is 210°C, and the traction speed of the pelletizer is 10rpm.

Embodiment 2

[0025] Weigh 70g of polyvinyl alcohol (Sinopec Great Wall Energy Chemical Ningxia Co., Ltd., brand 1788) and 900g of distilled water, heat and dissolve at 95°C, then add 30g of glycerin, 8g of ellagic acid, and 1g of magnesium chloride into the solution and stir to mix evenly. The solution is poured into a container, and vacuum-dried at 60° C. to obtain a dry mixture, and then the dried mixture is put into a single-screw extruder, and directly extruded and granulated to obtain a thermoplastic polyvinyl alcohol composition; wherein , the screw temperature is 250°C, the screw speed is 120rpm, the die temperature is 200°C, and the traction speed of the pelletizer is 10rpm.

Embodiment 3

[0027] Weigh 90g of polyvinyl alcohol (Sinopec Great Wall Energy Chemical Ningxia Co., Ltd., brand 1788) and 900g of distilled water and heat to dissolve at 95°C, then add 10g of glycidol, 2.5g of 6,7-dihydroxy-4-methylcoumarin 1. Calcium nitrate 1g was added to the solution and stirred evenly, then the mixed solution was poured into the container, and the dried mixture was obtained by vacuum drying at 60°C, and then the dried mixture was put into a single-screw extruder and extruded directly The thermoplastic polyvinyl alcohol composition was obtained by granulation; wherein, the screw temperature was 250°C, the screw speed was 120rpm, the die temperature was 220°C, and the traction speed of the pelletizer was 10rpm.

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Abstract

The invention discloses a polyvinyl alcohol composition capable of melt processing, which is prepared from the following raw materials in parts by weight: 70-95 parts of polyvinyl alcohol, 5-30 parts of plasticizer, 0.5-10 parts of heat stabilizer and 0.1-2 parts of metal salt. The preparation method comprises the following steps: directly mixing the raw materials or mixing the raw materials in a water solution, and carrying out extrusion and granulation by an extruder to obtain the polyvinyl alcohol composition. The melting point and thermal decomposition temperature of the composition have a great difference; and the composition has wider melt processing window, is convenient for melt processing, and can be used for preparing fiber products, film products, hollow containers, tubes or sheets.

Description

technical field [0001] The invention relates to the field of material processing, in particular to a polyvinyl alcohol composition with a wide melting processing window and a preparation method thereof. Background technique [0002] Polyvinyl alcohol (PVA) is a high-molecular polymer with excellent comprehensive properties that can be produced on a large scale by non-petroleum routes. It is cheap, has excellent oil resistance, solvent resistance and gas barrier performance, and has unique advantages in food and drug packaging; However, since a large number of intramolecular and intermolecular hydrogen bonds are easily formed between adjacent hydroxyl groups in the PVA polymer chain, its thermal decomposition temperature (200-250°C) is close to the melting point (230°C), and thermal decomposition occurs when it melts. Difficult to thermoplastic processing, which greatly limits the application and development of PVA. [0003] Modification methods such as copolymerization and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L71/02C08K5/053C08K5/13C08K3/16C08K5/1545C08K3/28C08K5/134C08K5/06
Inventor 东为富相晨农李婷汪洋马丕明陈明清
Owner JIANGNAN UNIV