Process for producing coating material for improving capability of PVC sheet material

The invention relates to a method for preparing a coating material for improving surface hydrophilicity and antistatic performance of a PVC sheet material. The proposal of the method comprises the following steps: adding ethyl orthosilicate, anhydrous ethyl alcohol, coupling agent and water into a container and mixing the mixture evenly, dripping concentrated nitric acid with mass fraction of 65 percent, adjusting pH value to between 2 and 4, magnetically stirring the mixture after being sealed, and sealing the mixture again and layering the mixture to obtain organic modified nano SiO2 ethanol dispersoid solution; and adding polymethyl methacrylate and tetrahydro furan or ethyl acetate into another container, stirring the mixture to dissolve the polymethyl methacrylate, and mixing the two solutions evenly to obtain the polymethyl methacrylate/SiO2 composite nano colloidal solution. The method overcomes the defect that surface free energy of PVC coated with PVDC latex has larger difference, and the coating has