A kind of hec/pva interpenetrating network film and preparation method thereof
An interpenetrating network and film technology, applied in the field of packaging materials, can solve the problems of poor mechanical properties of hydroxyethyl cellulose and polyvinyl alcohol, and achieve the effect of improving mechanical properties
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[0023] The invention provides a kind of preparation method of HEC / PVA interpenetrating network film, comprises the following steps:
[0024] Step 1. Mix the polyisocyanate solution and the hydroxyethyl cellulose solution according to the mass ratio of 1: (10-30), stir, and ultrasonically degas for 0.5-1.0 hours to obtain a uniform and viscous milky white mixed solution ; Ultrasonic degassing time is 0.5-1.0h;
[0025] Wherein, the mass percentage of the polyisocyanate solution is 1%-3%, and the polypolyisocyanate solution is mixed with water and stirred until a uniform milky white liquid; the mass percentage of the hydroxyethyl cellulose solution is 1%-3%. %, the hydroxyethyl cellulose solution is made by mixing hydroxyethyl cellulose with water, resting and swelling for 1-12 hours, and stirring until uniform and transparent viscous.
[0026] Step 2. The mixed solution in step 1 is formed into a film in a circular polytetrafluoroethylene mold by casting method, and dried at 4...
Embodiment 1
[0030] A kind of preparation method of HEC / PVA interpenetrating network film of the present invention, comprises the following steps:
[0031] Step 1. Mix hydroxyethyl cellulose with deionized water, let it stand for swelling for 1 hour, stir until it becomes uniform and transparent viscous, and prepare hydroxyethyl cellulose solution; the mass percentage of hydroxyethyl cellulose solution is 1 %;
[0032] Step 2, mixing polyisocyanate and deionized water, stirring until uniform milky white liquid, and preparing polyisocyanate solution; wherein, the mass percentage of polyisocyanate solution is 1%;
[0033] Step 3. Mix the polyisocyanate solution in step 2 with the hydroxyethyl cellulose solution in step 1 in a mass ratio of 1:10, stir, and degas it by ultrasonic for 0.5h to obtain a uniform and viscous milky white mixture solution;
[0034] Step 4. The mixed solution in step 3 is cast into a circular polytetrafluoroethylene mold to form a film, and dried at 40°C for 12 hour...
Embodiment 2
[0041] A kind of preparation method of HEC / PVA interpenetrating network film of the present invention, comprises the following steps:
[0042] Step 1. Mix hydroxyethyl cellulose with deionized water, let it stand for swelling for 3 hours, stir until uniform and transparent viscous, and prepare a hydroxyethyl cellulose solution. The mass percentage in the hydroxyethyl cellulose solution is 1.5%;
[0043] Step 2, mixing polyisocyanate and deionized water, stirring until uniform milky white liquid, and preparing polyisocyanate solution, wherein the mass percentage of polyisocyanate solution is 1.5%;
[0044] Step 3. Mix the polyisocyanate solution in step 2 with the hydroxyethyl cellulose solution in step 1 at a ratio of 1:15 by mass, stir, and degas by ultrasonic for 0.65 hours to obtain a uniform and viscous milky white mixture solution;
[0045] Step 4. The mixed solution in step 3 is formed into a film in a circular polytetrafluoroethylene mold by casting method, and dried ...
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