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Water-soluble polyvinyl alcohol film and preparation method thereof

A polyvinyl alcohol film, polyvinyl alcohol technology, which is applied to flat products, other household appliances, household appliances, etc., can solve the problems of restricting the popularization and application of water-soluble polyvinyl alcohol film, poor product performance, low production efficiency, etc. To achieve the effect of no pollution to the contact object, good product performance and high production efficiency

Inactive Publication Date: 2018-07-13
广州市启华化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional production process of water-soluble polyvinyl alcohol film material is mainly solution casting method, which has high production cost, low production efficiency and poor product performance, which seriously limits the popularization and application of water-soluble polyvinyl alcohol film

Method used

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  • Water-soluble polyvinyl alcohol film and preparation method thereof
  • Water-soluble polyvinyl alcohol film and preparation method thereof

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preparation example Construction

[0026] The preparation method of the water-soluble polyvinyl alcohol film of one embodiment of the present invention comprises the following steps S1~S3:

[0027] S1. Soak the polyvinyl alcohol in water at 55-85° C. for 5-30 minutes, and then filter off the water to obtain the precursor.

[0028] Preferably, the degree of polymerization of polyvinyl alcohol is 1000-2000. More preferably, the degree of polymerization of polyvinyl alcohol is 1700-2000. Preferably, the alcoholysis degree of polyvinyl alcohol is 95% or more. More preferably, the alcoholysis degree of polyvinyl alcohol is 99% or more. Polyvinyl alcohol with a higher degree of polymerization and higher degree of alcoholysis has better water resistance, and the prepared water-soluble polyvinyl alcohol film has better performance.

[0029] S2. Melting and extruding the precursor to obtain a polyvinyl alcohol modified material.

[0030] In one embodiment, the specific operation of extrusion is: under the condition ...

Embodiment 1

[0041] Soak 2 kg of polyvinyl alcohol (polyvinyl alcohol-1799) in 3 L of water at 70° C. for 15 minutes, then pour off excess water to obtain a precursor. Then the precursor is melt-extruded and granulated by a twin-screw extruder to obtain a polyvinyl alcohol modified material. Then, the polyvinyl alcohol modified material is blow-molded by a blow molding machine to obtain a water-soluble polyvinyl alcohol film. Among them, the temperature parameters of the twin-screw extruder are: 50°C for the first zone, 50°C for the second zone, 60°C for the third zone, 70°C for the fourth zone, 80°C for the fifth zone, 90°C for the sixth zone, and 90°C for the head; The screw speed of the machine is 80rpm. The temperature parameters of the blow molding machine are: 65°C for the first zone, 75°C for the second zone, 85°C for the third zone, 95°C for the fourth zone, and 95°C for the machine head; the screw speed of the blow molding machine is 100rpm.

Embodiment 2

[0043] Soak 2kg of polyvinyl alcohol in 3L of water at 75°C for 10 minutes, pour off the excess water to obtain a precursor; then melt and extrude the precursor through a twin-screw extruder and granulate to obtain a modified polyvinyl alcohol material; and then the polyvinyl alcohol modified material is blow-molded by a blow molding machine to obtain a water-soluble polyvinyl alcohol film. Among them, the temperature parameters of the twin-screw extruder are: 60°C for the first zone, 60°C for the second zone, 70°C for the third zone, 80°C for the fourth zone, 90°C for the fifth zone, 95°C for the sixth zone, and 95°C for the head; The screw speed of the machine is 90rpm. The temperature parameters of the blow molding machine are: 65°C for the first zone, 85°C for the second zone, 95°C for the third zone, 95°C for the fourth zone, and 95°C for the machine head; the screw speed of the blow molding machine is 120rpm.

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Abstract

The invention relates to a high-temperature water soluble polyvinyl alcohol thin film and a preparation method thereof. The method comprises the following steps of: soaking polyvinyl alcohol in water at 55-85 DEG C for 5-30min and filtering the mixture to obtain a precursor; performing melt extrusion on the precursor to obtain a polyvinyl alcohol modified material; and performing blow molding on the polyvinyl alcohol modified material to obtain the high-temperature water soluble polyvinyl alcohol thin film. According to the invention, polyvinyl alcohol is soaked in hot water at a certain temperature for a period of time, so that water molecules fills polyvinyl alcohol molecules, and the melting point of polyvinyl alcohol is reduced greatly, and therefore, extrusion and blow molding can be smoothly performed on polyvinyl alcohol. The production cost is remarkably reduced, the product performance is relatively good and stable, a contact object is not polluted, and the high-temperature water soluble polyvinyl alcohol thin film is simple in integral process flow, high in production efficiency and low in requirement on production operators.

Description

technical field [0001] The invention relates to the field of polymer films, in particular to a water-soluble polyvinyl alcohol film and a preparation method thereof. Background technique [0002] Because of its excellent water solubility and biodegradability, polyvinyl alcohol is widely used as a packaging film material in various fields such as chemical packaging, washing packaging, textile packaging, food packaging, and electronic and electrical product packaging. As a packaging material, polyvinyl alcohol film is better than polyolefin film in terms of transparency, antistatic property, oil resistance, organic solvent resistance and printability. [0003] At present, low-temperature water-soluble polyvinyl alcohol film materials account for more than 90% of domestic water-soluble film production. They are mainly used in the inner packaging of some products, embroidery carriers, water transfer printing, etc., and dissolve in water at about 20°C. The high-temperature water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D7/01
CPCB29D7/01
Inventor 舒友陈迪钊胡扬剑欧阳跃军王铭亮李佩英
Owner 广州市启华化工有限公司
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