Water insoluble modified polyvinyl alcohol coating liquid and its producing process
A polyvinyl alcohol coating, polyvinyl alcohol technology, applied in the direction of coating, can solve the problems of increased air permeability, long production cycle, excessive addition amount, etc., to improve processability, prevent gas permeation, excellent The effect of water resistance
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Embodiment 1
[0026] Embodiment 1: This embodiment is by the mixture of 8% polyvinyl alcohol, 15% methanol and ethanol, 1% clay, 10% melamine formaldehyde resin, 0.1% hydrochloric acid, 1% BP-4, 0.05 % of ethylene oxide compounds, and 64.85% of water. After fully mixing the above proportioned polyvinyl alcohol, the mixture of methanol and ethanol, clay and water, heat up, stir, keep warm when the temperature reaches 90-95°C, and fully dissolve the polyvinyl alcohol, and wait until the temperature drops to normal temperature , add the melamine-formaldehyde resin, BP-4 and ethylene oxide compound of the above ratio, and fully stir; before starting to use, add hydrochloric acid, and fully stir to obtain the modified polyvinyl alcohol coating with good water resistance of the present invention. cloth liquid. Coat the product of this embodiment with a thickness of 4 μm on a polypropylene PP base film with a thickness of 25 μm. After drying and forming a film, the oxygen transmission rate is 0.3...
Embodiment 2
[0027] Embodiment 2: The present embodiment is made of 7% polyvinyl alcohol, 30% ethanol, 5% nano silicon oxide, 0.5% melamine formaldehyde resin, 5% phosphoric acid, 5% oxirane compound and ethyl alcohol A mixture of glycol ethers consisting of 0.3% alcohol amine titanate and 47.2% water. After fully mixing the polyvinyl alcohol, ethanol, nano-silica, alcoholamine titanate and water in the above ratio, heat up and stir, and keep it warm when the temperature reaches 90-95°C to fully dissolve the polyvinyl alcohol. After cooling down to normal temperature, add the mixture of melamine-formaldehyde resin, ethylene oxide compound and glycol ether in the above ratio, and fully stir; before starting to use, add phosphoric acid, and fully stir to obtain the water-insoluble Modified polyvinyl alcohol coating solution. Coating the product of this example with a thickness of 2 μm on a polyamide PA base film with a thickness of 20 μm, after drying and forming a film, its oxygen transmis...
Embodiment 3
[0028] Embodiment 3: present embodiment is by the mixture of 1% polyvinyl alcohol, 20% methyl alcohol, 0.01% clay and nano-titanium oxide, 2.9% melamine formaldehyde resin, 3% phosphoric acid, 0.6% BP-4 , 0.01% aminosilane and 72.48% water. After fully mixing the mixture of polyvinyl alcohol, methanol, clay and nano-titanium oxide, 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 is lowered to normal temperature, add the melamine formaldehyde resin and BP-4 in the above ratio, and stir thoroughly. Before starting to use, add phosphoric acid and stir thoroughly to obtain the water-insoluble modified polyvinyl alcohol coating solution of the present invention. . Coating the product of this embodiment with a thickness of 5 μm on a polyethylene PE base film with a thickness of 65 μm, after drying and forming a film, its oxygen transmission rate is 0.31 cm 3 / m 2 ·24h·0.1Mpa...
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