Loose-structure polyvinyl alcohol (PVA) film and preparation method thereof
A polyvinyl alcohol resin and film technology, applied in the field of polyvinyl alcohol (PVA) film and its preparation, can solve the problems of poor dimensional stability of the film, decreased water flux and gas flux, and decreased tensile strength, etc. Effects of improved breaking strength and elongation at break, small swelling, high gel fraction and dimensional stability
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Embodiment 1
[0063] Preparation of secondary crosslinked polyvinyl alcohol film constructed by Diels-Alder reaction and hexamethylene diisocyanate-hydroxyl reaction: (1) Graft modification of polyvinyl alcohol: add 0.8g polyvinyl alcohol to 30ml DMSO, Stir at 70°C~80°C until the solution is transparent; add 0.2g triethylamine dropwise and stir until the solution is uniform; add 0.235g furoyl chloride dropwise within 10 minutes in an ice-water bath, and raise the temperature to 50°C~60°C and stir for 1~2h after the addition is completed ; (2) Preparation of single-network crosslinked polyvinyl alcohol film by Diels-Alder reaction: add 0.156g hexamethylene bismaleimide, 0.2g phthalic acid to the solution prepared in (1) Dibutyl ester, stir at room temperature for 1~2h until the solution is uniform and transparent, then scrape the solution on a 10cm*10cm polytetrafluoroethylene film frame, place it in an oven at 60°C~80°C, and dry the solvent to obtain Diels- Single-network polyvinyl alcohol ...
Embodiment 2
[0075]Preparation of secondary crosslinked polyvinyl alcohol film constructed by Diels-Alder reaction and p-phenylene diisocyanate-hydroxyl reaction: (1) Graft modification of polyvinyl alcohol and (1) graft modification in Example 1 The steps are the same; (2) The preparation of a single-network crosslinked polyvinyl alcohol film by the Diels-Alder reaction is the same as that in Example 1 (2); (3) the preparation of a secondary crosslinked polyvinyl alcohol film: Dissolve 0.1428g of p-phenylene diisocyanate in 5ml of DMSO, stir at 50°C for 2 hours until the solution is uniform, and evenly coat the prepared p-phenylene diisocyanate / DMSO solution on the single-network cross-linked polystyrene prepared in (2). On the vinyl alcohol film, place the film frame containing the film in an oven at 60°C to 80°C, and obtain a polyvinyl alcohol film with a loose structure after the solvent is dried.
[0076] The test method and test results of the obtained film are similar to those in Ex...
Embodiment 3
[0078] Preparation of secondary cross-linked polyvinyl alcohol film constructed by reaction of hexamethylene diisocyanate-hydroxyl and 4,4'-methylenebis(phenylisocyanate)-hydroxyl: (1) 0.8g polyethylene Add alcohol to 30ml DMSO, stir at 80°C~90°C until the solution becomes transparent, and scrape the solution on a 10cm*10cm polytetrafluoroethylene film frame, place it in an oven at 60°C~80°C, and wait for the solvent to dry Finally, pure polyvinyl alcohol film was obtained; (2) Preparation of secondary crosslinked polyvinyl alcohol film: 0.15g of hexamethylene diisocyanate and 0.2231g of 4,4'-methylene bis(phenylisocyanate ) was dissolved in 7ml of DMSO, ultrasonicated at 50°C for 2h until the solution was uniform, and prepared into a hexamethylene diisocyanate / 4,4'-methylene bis(phenylisocyanate) / DMSO solution, and the solution was homogenized Coated on the pure polyvinyl alcohol film prepared in (1), put the film frame containing the film in an oven at 60 ° C ~ 80 ° C, and o...
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