Preparation method for surface molding film of PVC-based stone plastic composite board

A preparation method for a surface molding film of a PVC-based stone plastic composite board, comprising the following steps:

• 1) surface activation treatment of the PVC-based stone plastic composite board:
• 1a) preparation of an activated putty:
• waste plastic powder and methyl methacrylate are dissolved in a mass ratio of (0.2-0.5):1 to form a homogeneous solution A with the total mass of W, and magnesium hydroxide, titanium dioxide, acrylic acid, benzoyl peroxide, an organic tertiary amine compound, and oxidized polyethylene wax powder are added into the solution A according to the mass ratio, stirred in an ice-water bath to form a high-viscosity putty, activated and cooled, and then placed in a refrigerator for storage;
• 1b) coarse roughening of a substrate surface:
• a surface of the PVC-based stone plastic composite board is coarsely ground and dedusted with an abrasive paper;
• 1c) application of the activated putty:
• a wet layer of activated putty of less than 300 μm is applied to the surface of the PVC-based stone plastic composite board by scraping or spraying;
• and
• 1d) fine roughening of the substrate surface:
• the substrate obtained in step 1c) stands at room temperature for solidification, and is coarsely ground and dedusted with the abrasive paper to obtain a surface-activated PVC-based stone-plastic composite board;
• 2) preparation of a PMMA slurry
• the methyl methacrylate is used as an active solvent to dissolve PMMA molding powder with the total mass of N, and the organic tertiary amine compound, the benzoyl peroxide, the oxidized polyethylene wax powder, the magnesium hydroxide, and a reflective pigment are added, stirred to form a highly dispersed high-viscosity slurry, pre-polymerized and cooled, and then placed in the refrigerator for storage;
• 3) surface film forming of the PVC-based stone plastic composite board
• the PMMA slurry is scrapped on the surface of the PVC-based stone plastic composite board, placed in a tempered glass mold, cold-pressed and shaped, and solidified, treated in high temperature, cooled and demolded to obtain a PVC-based stone plastic composite board coated with a PMMA film.