Краткое введение:
Polyvinyl Alcohol 05-88 (also known as PVA 0588 or 088-05) is a partially hydrolyzed, low-viscosity grade water-soluble polymer. It appears as white granules or powder.
При диапазоне вязкости 4.8 – 6.0 mPa.s and a degree of alcoholysis between 86.5 – 89.0 mol%, PVA 05-88 offers excellent solubility, surface activity, and film flexibility. It is specifically engineered for applications requiring high penetration and flow, such as textile sizing for fine filaments and as a stabilizer for emulsion polymerization.
Технические характеристики:
| Элемент | Спецификация |
|---|---|
| Степень алкоголиза (моль1Т3Т) | 86.5 - 89.0 |
| Вязкость (мПа·с) | 4.8 - 6.0 |
| Содержание летучих веществ (wt%, макс.) | 5 |
| Чистота (wt%, мин) | 93.5 |
| Значение pH | 5 ~ 7 |
| Содержание золы (wt%, макс.) | 0.6 |
Основные характеристики:
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Растворимость: Exhibits strong hydrophilicity. While it is soluble in water, for optimal performance, it is generally recommended to dissolve it in hot water (above 90°C). It is insoluble in most organic solvents.
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Film Forming: Forms flexible films with excellent mechanical properties. The film acts as a superior barrier against gases like Hydrogen, Nitrogen, and Oxygen.
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Адгезия: Provides strong bonding strength to hydrophilic surfaces, making it excellent for paper and textile applications.
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Химическая стабильность: Resistant to weak acids, weak alkalis, and oils.
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Реактивность: Capable of cross-linking reactions (e.g., with boric acid) to modify water resistance and viscosity.
Приложения:
Based on its low viscosity and partial hydrolysis, PVA 05-88 is widely used in:
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Текстильная промышленность: Used as a warp sizing agent for long fibers (filaments) where deep penetration into the yarn is required.
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Adhesive & Emulsion: Acts as an effective stabilizer and emulsifier for PVAc (Polyvinyl Acetate) emulsions.
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Обработка бумаги: Used as a coating agent for art paper (coated paper) to improve surface gloss and printability.
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Printing & Photosensitive Materials: Essential component in zinc plate printing (photoengraving) and the manufacturing of photosensitive films.
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Специальные клеи: Used in the production of re-wettable adhesives (remoistening adhesives) for postage stamps and envelopes.
Упаковка:
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Упаковка: 25 кг в мешке.
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ХранилищеХранить в прохладном, сухом и хорошо проветриваемом месте, чтобы предотвратить слипание и впитывание влаги.
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Продукт Хранилище:
Хранить в сухом, хорошо проветриваемом месте, чтобы предотвратить впитывание влаги.
ЧАСТО ЗАДАВАЕМЫЕ ВОПРОСЫ:
Q: What is the difference between PVA 05-88 and PVA 17-88?
A: Both are partially hydrolyzed grades (around 88%), but they differ significantly in вязкость.
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PVA 05-88 is a low viscosity grade (4.8-6.0 mPa.s), offering better flow and penetration, suitable for fine textile sizing and coatings.
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ПВА 17-88 is a medium viscosity grade (19.5-32.0 mPa.s), providing higher solution thickness and stronger initial tack for general adhesives.
Q: How does PVA 05-88 compare to PVA 05-99?
A: Both are low viscosity grades, but they differ in гидролиз:
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PVA 05-88 is partially hydrolyzed, offering better solubility speed, flexibility, and surface activity.
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ПВА 05-99 is полностью гидролизованный, offering superior water resistance and tensile strength after drying.
Q: Can PVA 05-88 be used for photosensitive coatings?
A: Yes, PVA 05-88 is specifically listed for use in photosensitive films and zinc plate printing due to its precise film-forming properties and reactivity.
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