Preparation process for polyvinyl alcohol film

[0016] Example 1:

[0017] The present invention includes polyvinyl alcohol, nano-level rare earth, ethyl vanillin, Tween 80 and castor oil;

[0018] Follow the process steps below:

[0019] 2) The polyvinyl alcohol is prepared in a water bath at a temperature of 90 to prepare a polyethylene film liquid;

[0020] 2) Mix ethyl vanillin and castor oil evenly and set aside, record it as substance A;

[0021] 3) Mix the nano-level rare earth and Tween 80 evenly for use, and record it as substance B;

[0022] 4) Add substance A to the polyethylene film solution, mix it evenly, and record it as substance C;

[0023] 5) Add substance B to substance C, mix it evenly, and then coat it on a glass plate to prepare a polyvinyl alcohol film.

[0024] In the step 1), the water bath time is 2.2h.

[0025] In the step 2), the mass ratio of ethyl vanillin to castor oil is 1:0.5.

[0026] In the step 3), the mass ratio of nano-scale rare earth to Tween 80 is 1:0.5.

[0027] Example 2:

[0028] The present invention includes polyvinyl alcohol, nano-level rare earth, ethyl vanillin, Tween 80 and castor oil;

[0029] Follow the process steps below:

[0030] 3) The polyvinyl alcohol is prepared in a water bath at a temperature of 92 to prepare a polyethylene film liquid;

[0031] 2) Mix ethyl vanillin and castor oil evenly and set aside, record it as substance A;

[0032] 3) Mix the nano-level rare earth and Tween 80 evenly for use, and record it as substance B;

[0033] 4) Add substance A to the polyethylene film solution, mix it evenly, and record it as substance C;

[0034] 5) Add substance B to substance C, mix it evenly, and then coat it on a glass plate to prepare a polyvinyl alcohol film.

[0035] In the step 1), the water bath time is 2h.

[0036] In the step 2), the mass ratio of ethyl vanillin and castor oil is 1:0.4.

[0037] In the step 3), the mass ratio of nano-scale rare earth to Tween 80 is 1:0.6.