Method for making canvas

A method for making a canvas, comprising the following steps:

• step 1, drying and setting a gray fabric;
• step 2, coating the gray fabric set in step 1 with a first sizing which has the following components by mass:
• 8-12 parts of styrene-acrylate emulsion, 30-50 parts of polyvinyl acetate emulsion, 4-6 parts of polysiloxane, 10-16 parts of calcium carbonate, 1-3 parts of silicon dioxide, 1-3 parts of magnesium oxide and 0.3-0.7 part of titanium dioxide, and drying the gray fabric at 80-170° C.;
• and
• step 3, coating the gray fabric dried in step 2 with a second sizing which has the following components by mass:
• 50-65 parts of acrylic emulsion, 10-15 parts of polyvinyl acetate emulsion, 0.08-0.2 parts of a thickening agent, 0.3-0.8 part of a crosslinking agent and 0.5-1.2 parts of a co-crosslinking agent, and drying the gray fabric;
• wherein in step 2 a first coating layer is ⅛- 1/10 of a weight of the gray fabric;
• and in step 3, a drying temperature is 70-130° C., and a second coating layer is 1/20- 1/10 of the weight of the gray fabric.