Ultralow-viscosity modified polyvinyl alcohol as well as production method and application thereof

By copolymerizing polyene compounds with vinyl acetate and controlling the alcoholysis conditions, ultra-low viscosity PVA with a low methanol ratio was prepared, which solved the problem of insufficient toughness of water-soluble membranes and improved the elongation at break and anti-skinning properties of the membranes.

CN121991276APending Publication Date: 2026-05-08CHINA PETROLEUM & CHEMICAL CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2024-11-08
Publication Date
2026-05-08

AI Technical Summary

Technical Problem

Existing technologies struggle to prepare ultra-low viscosity polyvinyl alcohol water-soluble films that are not tough enough and are prone to breakage, especially with insufficient performance at low methanol ratios.

Method used

Polyene compounds were used as the second monomer to copolymerize with vinyl acetate, and the polymerization reaction was carried out in a methanol solvent ratio of less than 40%. Subsequently, alcoholysis was carried out by adding sodium hydroxide, and the alcoholysis temperature and time were controlled.

Benefits of technology

It was achieved that ultra-low viscosity PVA with a viscosity of less than 6 mPa·s or even 3 mPa·s was prepared with a low methanol ratio, which improved the toughness and anti-skinning properties of water-soluble films and solved the problem of unsatisfactory toughness.

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Abstract

The invention provides a production method of ultralow-viscosity modified polyvinyl alcohol, which comprises the following steps of: polymerizing vinyl acetate serving as a main monomer raw material, performing alcoholysis to obtain the ultralow-viscosity modified polyvinyl alcohol, taking methanol as a solvent, and adding a polyene compound serving as a second monomer to copolymerize with the vinyl acetate monomer to obtain the ultralow-viscosity modified polyvinyl alcohol. The proportion of the used solvent is lower than 40% by mass of the polymerization reaction system. The elongation at break of the water-soluble film prepared from the ultra-low-viscosity PVA is increased by 6-13% compared with that of conventional PVA, the problem that the toughness of a low-viscosity PVA film is not ideal is solved, and better application of the PVA water-soluble film is facilitated.
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Citation Information

Patent Citations

  • Method for improving forming of low-viscosity polyvinyl alcohol

    CN104558319A

  • Low-viscosity polyvinyl alcohol and preparation method thereof

    CN111100222A

  • Low-viscosity polyvinyl alcohol and production method thereof

    CN112707983A

  • Forming method of ultra-low viscosity polyvinyl alcohol solid

    CN114426686A