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Processing method for reducing solubility of polyvinyl alcohol (PVA) film

A treatment method, polyvinyl alcohol technology, applied in the treatment field of reducing the solubility of polyvinyl alcohol film, can solve problems such as unsatisfactory, reduced solubility, decreased solubility, etc., to prevent moisture from entering, reduce solubility, and crystallinity Improved effect

Inactive Publication Date: 2010-02-03
DONGHUA UNIV
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Problems solved by technology

However, PVA film is prone to dissolution in the presence of moisture, resulting in the loss of its basic physical and mechanical properties.
In order to solve this problem, the method usually adopted is exactly high temperature heat treatment, but the PVA film treated by this method is brittle and yellowish, and the dissolution performance is not ideal enough.
In order to further reduce the solubility, cross-linking agents such as borax or glyoxal can be added to PVA, but the introduction of these chemical reagents is likely to cause environmental pollution
Another method is to laminate the PVA film with other hydrophobic materials such as polyethylene or polypropylene materials, but due to the poor compatibility of PVA and other polymers, the process operation is more complicated

Method used

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  • Processing method for reducing solubility of polyvinyl alcohol (PVA) film

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Weigh 6 grams of polyvinyl alcohol particles (specification: 1799, degree of polymerization is 1700, degree of alcoholysis is 99%) with a microbalance, dissolve in 200 milliliters of deionized water, heat and stir at 95°C for 2-3 hours, and The boiled slurry is vacuumed to remove air bubbles, slowly poured on the polyester film, and then peeled off after natural drying to form a film. The thickness of the film is measured by a thickness gauge to be about 40 μm.

[0016] (2) Put water in the desiccator, put the PVA film on the partition, and do not touch the water surface. Try to seal the desiccator and place it for 24 hours to make the film completely absorb moisture, and the moisture regain rate reaches 78.31%.

[0017] (3) Regulating atmospheric pressure plasma treatment parameters (using gas as He / O 2 , the processing power is 80-100W, the frequency is 13.56MHz, and the distance between the nozzle and the substrate is 2-4mm), and then the wet-balanced PVA film i...

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Abstract

The invention relates to a processing method for reducing the solubility of a polyvinyl alcohol (PVA) film, which comprises the following steps: putting the PVA film in a humid environment with the relative humidity more than 90% for 24-28 hours; putting the PVA film on a transmission device which is positioned right below a nozzle, and enabling the PVA film to horizontally pass through the nozzle; and processing the PVA film by using normal atmosphere plasma jet for 1-3min in the humid environment with the relative humidity more than 90%. The method of the invention has simple technology, high efficiency and no pollution and is suitable for industrial application.

Description

technical field [0001] The invention belongs to the field of processing the dissolving properties of polyvinyl alcohol (PVA) films, in particular to a processing method for reducing the dissolving properties of polyvinyl alcohol (PVA) films. Background technique [0002] Plasma treatment is a gaseous treatment technology that combines physical and chemical methods. Compared with traditional physical and chemical treatment processes, it has the advantages of low pollution, low energy consumption, no water consumption, and no chemical reagents. However, since plasma surface treatment has been carried out in low pressure or vacuum for a long time, the production cost is very high, and it cannot be used in the modification of relatively low value-added polymer products. Plasma surface treatment has always remained in the laboratory stage. There are almost no industrial applications. For this reason, the non-equilibrium non-equilibrium atmospheric pressure plasma surface treatme...

Claims

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Application Information

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IPC IPC(8): C08J7/00
Inventor 彭淑静王春霞邱夷平
Owner DONGHUA UNIV
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