A method for preparing transparent, antifreeze and flame retardant polyvinyl alcohol film

A technology of polyvinyl alcohol film and polyvinyl alcohol powder, which is applied in the direction of coating, can solve the problems of difficult thermoplastic processing, flame retardant and anti-freezing properties, etc., to improve the thermoplastic film-forming and appearance, and maintain transparency. , to avoid the effect of bubbles

Active Publication Date: 2016-09-28
YONGAN SYF WATER SOLUBLE FILMS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that most of the above-mentioned known methods need to use water as a plasticizer, and add a large amount of flame retardants and fillers. It is difficult to achieve thermoplastic processing, flame retardancy and antifreeze performance of products while maintaining the excellent transparency of PVA.

Method used

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  • A method for preparing transparent, antifreeze and flame retardant polyvinyl alcohol film
  • A method for preparing transparent, antifreeze and flame retardant polyvinyl alcohol film
  • A method for preparing transparent, antifreeze and flame retardant polyvinyl alcohol film

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Experimental program
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Effect test

Embodiment 1

[0028] Get number-average particle diameter and be 0.01mm, average degree of polymerization is 1500, degree of alcoholysis is 70 kilograms of polyvinyl alcohol powders of 99.8% and chemical structural formula is 30 kg of ionic liquid was physically mixed in a high-speed mixer, and then the mixture was injected into a conical twin-screw extruder, melted and extruded at a temperature of 160 ° C, and the screw speed was 60 rpm. The residence time in the extruder is 12 minutes, the extrusion pressure is normal, the extruded melt is cooled in the air, pelletized, and then the obtained pellets are injected into a single-screw extruder for blow molding at a temperature of 180°C Formed into a film, the average thickness of the obtained film is 0.028mm, the surface is smooth and free of bubbles, the visible light transmittance is 90%, the elongation at break at 20°C and -20°C is 95% and 65% respectively, and the limiting oxygen index is 28%, vertical combustion is UL94-V0 level.

Embodiment 2

[0030] Get number-average particle diameter and be 0.055mm, average degree of polymerization is 1700, degree of alcoholysis is 80 kilograms of polyvinyl alcohol powders of 88% and chemical structural formula is 15 kg of ionic liquid and 5 kg of triethylene glycol were physically mixed in a high-speed mixer, and then the mixture was injected into a conical twin-screw extruder, melted and extruded at a temperature of 170 ° C, and the screw speed was 72 rpm The residence time of the melt in the twin-screw extruder is 10 minutes, the extrusion pressure is normal, the extruded melt is cooled in the air, pelletized, and then the resulting pellets are injected into the single-screw extruder, at 190 The average thickness of the obtained film is 0.016mm, the surface is smooth and free of bubbles, the visible light transmittance is 92%, and the elongation at break at 20°C and -20°C are 110% and 100% respectively. 68%, the limiting oxygen index is 30%, and the vertical combustion is UL9...

Embodiment 3

[0032] It is 90 kilograms of polyvinyl alcohol powder that the number average particle diameter is 0.1mm, the average degree of polymerization is 1600, and the degree of alcoholysis is 93.9% and the chemical structural formula is 5 kg of ionic liquid and 5 kg of triethylene glycol were physically mixed in a high-speed mixer, and then the mixture was injected into a conical twin-screw extruder, melted and extruded at a temperature of 180 ° C, and the screw speed was 90 rpm points, the residence time of the melt in the twin-screw extruder is 8 minutes, the extrusion pressure is normal, the extruded melt is cooled in the air, pelletized, and then the resulting pellets are injected into the single-screw extruder, at 200 The film was calendered at a temperature of ℃, the average thickness of the obtained film was 0.045mm, the surface was smooth and free of bubbles, the visible light transmittance was 88%, and the elongation at break at 20°C and -20°C were 89% and 60%, respectively....

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Abstract

The invention discloses a method for preparing a transparent, antifreezing and flame retardant polyvinyl alcohol film. The method comprises the following steps: physically mixing polyvinyl alcohol powder with a modification additive containing an ionic liquid uniformly according to a weight ratio of (70 / 30)-(90 / 10); injecting the mixture into a twin-screw extruder with a heating device, then carrying out melt extrusion on the mixture at 160-180 DEG C and enabling the melt time of the mixture in the twin-screw extruder to be 8-12 minutes by adjusting the screw speed; cooling and granulating the extruded melt in the air; and injecting the obtained granules into a single-screw extruder with a heating device to form the film by blow molding, curtain coating or calendering at 180-200 DEG C. The ionic liquid adopted in the method carries out hydrogen bond complexing with polyvinyl alcohol in the thermoplastic processing course, so that the prepared polyvinyl alcohol film has high transparency, antifreezing property and flame retardance and has application advantages in the fields of packaging, building materials and the like.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, and in particular relates to a method for preparing a transparent, frost-resistant and flame-retardant polyvinyl alcohol film. Background technique [0002] Polyvinyl alcohol (PVA) is a water-soluble degradable polymer material with excellent performance and wide range of uses. It is widely used in coatings, adhesives, fibers and other industries. In recent years, PVA film has developed rapidly, with an average annual growth rate of more than 8% in the world. PVA film has excellent biodegradability, gas barrier property, water solubility, high transparency, oil resistance, antistatic and mechanical properties, and has significant application advantages in packaging, building materials and other fields. [0003] my country is a big country in the production and consumption of PVA, but its application is excessively concentrated in the fields of coatings and adhesives, and it lags behind Ja...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08K5/49C08K5/06C08J5/18B29C49/78B29C41/52B29C43/58
Inventor 苏哲苏世明
Owner YONGAN SYF WATER SOLUBLE FILMS
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