A kind of polyvinyl alcohol medical sponge and preparation method thereof
A polyvinyl alcohol and sponge technology, applied in medical science, bandages, absorbent pads, etc., can solve the problems of sponge products with large cell diameter, many inorganic strong acid catalysts, and large amount of sodium bicarbonate added, and achieve uniform pore size and easy control , 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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