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Method for improving water resisting performance of polyvinyl alcohol film from polycaprolactone and polylactic acid

A technology of polyvinyl alcohol film and polycaprolactone, which is applied in the field of polymer film preparation, to achieve the effects of improved water resistance, easy grasp and simple operation

Inactive Publication Date: 2014-06-18
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new technology makes it easier than previous techniques by making better ways to make films that resist moisture compared to traditional materials like vinyl chloride or PVC resin. It also simplifies how these modifications are done while still maintaining their effectiveness over time.

Problems solved by technology

This patented technical problem addressed in this patents relates to how to enhance the properties (such as strength) or compatibility between different polymers when making films that resist moisture better than existing ones without these modifications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Synthesis of polycaprolactone containing terminal -NCO groups:

[0017] Add 12 grams of polycaprolactone monododecyl ether with a molecular weight of 2000, 16.8 grams of 2,4-toluene diisocyanate and 280 ml of dimethyl sulfoxide solvent in the dry reactor, and add the total weight of the above reactants 3 ‰ of dibutyltin dilaurate, under an inert atmosphere, stirred and reacted at 50°C for 50 minutes, terminated the reaction, and removed excess diisocyanate by dialysis to obtain the target product;

[0018] 2) Synthesis of polyvinyl alcohol-polycaprolactone graft copolymer:

[0019] Add 10 grams of polycaprolactone monolauryl ether containing terminal -NCO groups, 8.5 grams of polyvinyl alcohol (molecular weight: 30,000) and 200 ml of dimethyl sulfoxide solvent into the dry reactor, and add the above reactants Dibutyltin dilaurate with a total weight of 3‰, under an inert atmosphere, stirred and reacted at 50°C for 50 minutes, terminated the reaction, and then obtain...

Embodiment 2

[0024] 1) Synthesis of polycaprolactone containing terminal -NCO groups:

[0025] Add 12 grams of polycaprolactone monododecyl ether with a molecular weight of 2500, 16.7 grams of 2,4-toluene diisocyanate and 290 ml of dimethyl sulfoxide solvent in the dry reactor, and add the total weight of the above reactants 4 ‰ of dibutyltin dilaurate, under an inert atmosphere, stirred and reacted at 52°C for 55 minutes, terminated the reaction, and removed excess diisocyanate by dialysis to obtain the target product;

[0026] 2) Synthesis of polyvinyl alcohol-polycaprolactone graft copolymer:

[0027] Add 10 grams of polycaprolactone monolauryl ether containing terminal -NCO groups, 7.9 grams of polyvinyl alcohol (molecular weight: 40,000) into a dry reactor, add 210 ml of dimethyl sulfoxide to dissolve, add the above Dibutyltin dilaurate with a total weight of 4‰ of reactants, under an inert atmosphere, stirred and reacted at 52°C for 55 minutes, then terminated the reaction, and then...

Embodiment 3

[0032] 1) Synthesis of polycaprolactone containing terminal -NCO groups:

[0033] Add 12 grams of polycaprolactone monododecyl ether with a molecular weight of 3000, 15.1 grams of 2,4-toluene diisocyanate and 270 ml of dimethyl sulfoxide solvent in the dry reactor, and add the total weight of the above reactants 5 ‰ of dibutyltin dilaurate, under an inert atmosphere, stirred and reacted at 55°C for 60 minutes, terminated the reaction, and used dialysis to remove excess diisocyanate to obtain the target product;

[0034] 2) Synthesis of polyvinyl alcohol-polycaprolactone graft copolymer:

[0035] Add 10 grams of polycaprolactone monolauryl ether containing terminal -NCO groups, 7.16 grams of polyvinyl alcohol (molecular weight: 50,000) into the dry reactor, add 205 ml of dimethyl sulfoxide to dissolve, add the above Dibutyltin dilaurate with a total weight of 5‰ of reactants, under an inert atmosphere, stirred and reacted at 55°C for 60 minutes, then terminated the reaction, a...

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PUM

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Abstract

The invention discloses a method for improving water resisting performance of a polyvinyl alcohol film from polycaprolactone and polylactic acid. The method comprises the following steps: (1) synthesis of polycaprolactone containing terminal-NCO groups: adding polycaprolactone, diisocyanate, a catalyst and a solvent in a drying reactor, and stirring for reaction at the temperature of 50-55 DEG C so as to obtain a target product; (2) synthesis of polyvinyl alcohol-polycaprolactone graft copolymer: adding the polycaprolactone containing terminal-NCO groups, polyvinyl alcohol, a solvent and a catalyst in the drying reactor, stirring for reaction at the temperature of 50-55 DEG C so as to obtain a target product; and (3) preparation of a polyvinyl alcohol film modified by polycaprolactone and polylactic acid: adding the polyvinyl alcohol-polycaprolactone graft copolymer, polylactic acid and a solvent in the drying reactor, and stirring for mixing at the temperature of 40-50 DEG C, forming a film via a tape casting process and drying the film so as to obtain a target product. The preparation technology is simple and easy to master, and the water resisting performance of the modified membrane is improved greatly.

Description

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Claims

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Application Information

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Owner SHANDONG UNIV OF TECH
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