Modified PVA paint and its prepn process
A technology of polyvinyl alcohol coating and polyvinyl alcohol, which is applied in the field of modified polyvinyl alcohol coating liquid and its production process, can solve the problems of increased oxygen transmission rate, compounding of universal materials, and excessive addition amount, etc. Achieve the effects of reducing water vapor transmission, preventing gas permeation, and improving processability
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Embodiment 1
[0023] Example 1: This example is composed of 20% polyvinyl alcohol, 22% ethanol, 5% clay, 0.3% aminosilane, 1% polyethyleneimine and 51.7% water. After fully mixing the above-mentioned polyvinyl alcohol, ethanol, clay, aminosilane and water, heat up and stir, and keep warm when the temperature reaches 90-95°C to fully dissolve the polyvinyl alcohol. After the temperature drops to room temperature, add The above proportioned polyethyleneimine is fully stirred to obtain the modified polyvinyl alcohol coating solution of the present invention. Coat the product of this embodiment with a thickness of 18 μm on a polypropylene POPP base film of 2.5 μm, and after drying into a film, the oxygen transmission rate is 0.61 cm 3 / m 2 ·24h·0.1Mpa, the water vapor transmission rate is 0.86g / m 2 24h.
Embodiment 2
[0024] Embodiment 2: This embodiment is made of 1% polyvinyl alcohol, 1% methanol, a mixture of nano-titanium oxide and nano-silicon oxide, 0.01% vinyl silane, 15% polyethyleneimine and poly A mixture of ethylene oxide, 82.98% water composition. After fully mixing the above-mentioned proportion of polyvinyl alcohol, methanol, mixture of nano-titanium oxide and nano-silicon oxide, vinyl silane and water, heat up and stir, and keep warm when the temperature reaches 90-95°C to fully dissolve the polyvinyl alcohol Finally, after the temperature drops to normal temperature, add the above-mentioned mixture of polyethyleneimine and polyethylene oxide, and stir thoroughly to obtain the modified polyvinyl alcohol coating solution of the present invention. Coating the product of this example with a thickness of 0.75 μm on a polyester PET base film with a thickness of 12 μm, after drying and forming a film, its oxygen transmission rate is 1.5 cm 3 / m 2 ·24h·0.1Mpa, at a temperature of ...
Embodiment 3
[0025] Embodiment 3: This embodiment is made of 12.2% polyvinyl alcohol, 40% methanol and ethanol mixture, 1.76% nano titanium oxide and clay mixture, 0.03% alcohol amine titanate, 6% polyoxygen Ethylene, 0.01% BP-4, 20% glycerol, ethanolamine, polyethylene glycol mixture, 20% water. Mix the polyvinyl alcohol, mixture of methanol and ethanol, mixture of nano-titanium oxide and clay, alcohol amine titanate, and water in the above ratio, heat up, stir, keep warm when the temperature reaches 90-95°C, and make the polyvinyl alcohol After vinyl alcohol is fully dissolved, after the temperature drops to normal temperature, add the above-mentioned ratio of polyethylene oxide, BP-4, glycerol, ethanolamine, polyethylene glycol mixture, and fully stir to obtain the modified polyethylene of the present invention. Alcohol coating solution. Coating the product of this embodiment with a thickness of 100 μm on a kraft paper base film of 1 μm, after drying and forming a film, its oxygen tran...
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