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Polyvinyl alcohol film with high swelling degree and preparation method thereof

A polyvinyl alcohol film and polyvinyl alcohol-based technology, which is applied in the field of polymer film preparation, can solve the problems of small swelling degree, influence on dyeing effect, low elongation at break, etc., and achieve high swelling degree, simple process and high polarized light. performance effect

Active Publication Date: 2016-09-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the swelling degree is too small, it will affect the absorption of iodine when the PVA film is dyed, and then affect the dyeing effect
In addition, if the swelling degree of the PVA film is too small, the tension will be large during stretching, making it difficult to stretch sufficiently, resulting in insufficient orientation of the PVA molecular chains, thereby affecting the polarizing properties of the product
[0004] At present, PVA film still has the disadvantages of brittleness, low elongation at break and poor swelling performance, so it is necessary to further improve the swelling performance of PVA film

Method used

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  • Polyvinyl alcohol film with high swelling degree and preparation method thereof

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preparation example Construction

[0026] The present invention also provides a preparation method of the above-mentioned polyvinyl alcohol film with a high degree of swelling, and the preparation method includes the following steps.

[0027] Step A:

[0028] Prepare a film-making stock solution containing polyvinyl alcohol-based polymers, polypropylene glycol, polyols and solvents. Among them, preferably in the film-making stock solution, the mass fraction of the polyvinyl alcohol-based polymer is controlled to be 5-30%, the mass fraction of polypropylene glycol is 0.1-3% of the mass fraction of the polyvinyl alcohol-based polymer, and the mass fraction of the polyol is The fraction is 0.5-5% of the mass fraction of the polyvinyl alcohol-based polymer and the balance is solvent, wherein the sum of the contents of each component is 100%.

[0029] During specific preparation, the solvent is added into a container containing polyvinyl alcohol-based polymers, polypropylene glycol and polyols, and stirred for 5-6 ...

Embodiment 1

[0043] Weigh 40g of polyvinyl alcohol, 0.4g of polypropylene glycol and 0.8g of pentaerythritol into a 500ml three-necked flask, fix the three-necked flask on an iron stand, and install a stirring device and a reflux device.

[0044] Measure 360ml of deionized water as a solvent and add it to the flask, heat it in a water bath to 95°C and stir for 6 hours to completely dissolve the polyvinyl alcohol to obtain a film-making stock solution, in which the degree of polymerization of polyvinyl alcohol is 5000 and the degree of alcoholysis is 99.5% , The molecular weight of polypropylene glycol is 3000.

[0045] The film-making stock solution was poured into a petri dish, cast into a film and dried in an incubator. The temperature of the incubator was controlled at 60° C. and the drying time was 8 hours to obtain a polyvinyl alcohol film sample. The variation curve of polyvinyl alcohol film swelling degree with time in the present embodiment is as follows figure 1 As shown, in this...

Embodiment 2

[0048] Weigh 40g of polyvinyl alcohol, 0.4g of polypropylene glycol and 1.2g of pentaerythritol into a 500ml three-necked flask, fix the three-necked flask on an iron stand, and install a stirring device and a reflux device.

[0049] Measure 360ml of deionized water as a solvent and add it to the flask, heat it in a water bath to 95°C and stir for 6 hours to completely dissolve the polyvinyl alcohol to obtain a film-making stock solution, in which the degree of polymerization of polyvinyl alcohol is 5000 and the degree of alcoholysis is 99.5% , The molecular weight of polypropylene glycol is 3000.

[0050] The film-making stock solution was poured into a petri dish, cast into a film and dried in an incubator. The temperature of the incubator was controlled at 60° C. and the drying time was 12 hours to obtain a polyvinyl alcohol film sample. The variation curve of polyvinyl alcohol film swelling degree with time in the present embodiment is as follows figure 1 As shown, in thi...

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Abstract

The invention discloses a polyvinyl alcohol film with the high swelling degree and a preparation method thereof. The polyvinyl alcohol film is prepared from a film preparing stock solution containing a polyvinyl alcohol polymer, polypropylene glycol, polyalcohol and a solvent, wherein after the polyvinyl alcohol film is infiltrated in 20-30-DEG C distilled water for 2-4 h, the highest swelling degree reaches 430%. The preparation method comprises the following steps that 1, the film preparing stock solution containing the polyvinyl alcohol polymer, polypropylene glycol, polyalcohol and the solvent is prepared; 2, the film preparing stock solution is tape-casted into a film and dried at constant temperature to obtain the polyvinyl alcohol film with the high swelling degree. Compared with the prior art, the preparation process is simple and easy to master, and the prepared polyvinyl alcohol film has the very high swelling degree and can be used as a raw material for manufacturing a polarizing film with the high polarizing property.

Description

technical field [0001] The invention relates to the technical field of polymer film preparation, in particular to a polyvinyl alcohol film with high swelling degree and a preparation method thereof. Background technique [0002] Polarizers are one of the important components of liquid crystal displays. Generally, polyvinyl alcohol-based polymer film stock solutions are cast into films, washed, swollen and dyed, and stretched in one way, or dyed while stretching, and then stretched. A polarizing film is manufactured by boride fixing treatment, and then a triacetyl cellulose (TAC) film is laminated on both sides of the film as a protective film. [0003] In the above-mentioned preparation process of the polarizing film, the swelling property of the polyvinyl alcohol-based polymer film (PVA film) is particularly important. The degree of swelling of the PVA film has a significant impact on the dyeing and stretching during the preparation of the polarizing film. If the swelling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L71/02C08K5/053C08J5/18
CPCC08J5/18C08J2329/04C08J2471/02C08K2201/014C08L29/04C08L2203/16C08L71/02C08K5/053
Inventor 吴桐惠志锋
Owner CHINA PETROLEUM & CHEM CORP
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