Medical polyvinyl alcohol sponge and preparation method
A polyvinyl alcohol and sponge technology, which is used in medical science, bandages, absorbent pads, etc., can solve the problems of large cell diameter of sponge products, multi-inorganic strong acid catalysts, and large amount of sodium bicarbonate added, and achieve uniform pore size and easy control. , The effect of good pore connectivity and fast liquid absorption
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Embodiment 1
[0031] A preparation method of polyvinyl alcohol medical sponge, comprising the steps of:
[0032] (1) In parts by weight, after blending 50 parts of polyvinyl alcohol with a degree of polymerization of 1700 and a degree of alcoholysis of 99.9% and 5 parts of wheat starch, and 300 parts of distilled water into the reactor, under 50 ℃ oil bath , with a rotating speed of 100r / min, stirring and dissolving for 24 hours to obtain a mixed solution of starch and polyvinyl alcohol;
[0033] (2) Add 1 part of sodium alkylsulfonate, 1 part of glycerin, and 30 parts of hexamethylenetetramine to the above-mentioned mixed solution of starch and polyvinyl alcohol, and stir at a constant speed at a temperature of 20°C at a speed of 200r / min. 8h, obtain the second mixed solution;
[0034] (3) Add 25 parts of hydrochloric acid to the above-mentioned second mixed solution, the constant temperature of the oil bath is 20°C, and carry out the cross-linking reaction of acetalization for 6 minutes....
Embodiment 2
[0039] A preparation method of polyvinyl alcohol medical sponge, comprising the steps of:
[0040] (1) In parts by weight, 50 parts of polyvinyl alcohol with a degree of polymerization of 2000 and a degree of alcoholysis of 80% and 5 parts of cornstarch are evenly blended, and then added to the reactor with 400 parts of distilled water and heated in an oil bath at 95°C , with a rotating speed of 600r / min, stirring and dissolving for 1h to obtain a mixed solution of starch and polyvinyl alcohol;
[0041] (2) Add 0.5 parts of diglycerol polypropylene glycol ether, 0.5 parts of diethanolamine, and 30 parts of formaldehyde to the above-mentioned mixed solution of starch and polyvinyl alcohol, and stir at a constant speed of 350 r / min at a temperature of 60 ° C for 2 hours to obtain the first Two mixed solutions;
[0042] (3) Add 50 parts of hydrochloric acid to the above-mentioned second mixed solution, the constant temperature of the oil bath is 60°C, and carry out the cross-lin...
Embodiment 3
[0047] A preparation method of polyvinyl alcohol medical sponge, comprising the steps of:
[0048] (1) In parts by weight, 50 parts of polyvinyl alcohol with a degree of polymerization of 2400 and 88% degree of alcoholysis, 50 parts of polyvinyl alcohol with a degree of polymerization of 99.9% and 5 parts of wheat starch with 5 parts of polyvinyl alcohol with a degree of alcoholysis of 88% After the cornstarch is evenly blended, add 1000 parts of distilled water into the reactor, and stir and dissolve for 24 hours in an oil bath at 95°C with a rotation speed of 100r / min to obtain a mixed solution of starch and polyvinyl alcohol;
[0049] (2) Add 10 parts of sodium alkyl sulfonate, 10 parts of glycerin, and 70 parts of formaldehyde to the above-mentioned mixed solution of starch and polyvinyl alcohol, and stir at a constant speed of 8 hours at a temperature of 60° C. at a speed of 350 r / min to obtain the second mixture;
[0050] (3) Add 50 parts of sulfuric acid to the above-m...
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