In order to evaluate the elastic wall latex paint, in addition to the general latex paint performance test (GB/T9755--2001), the following tests should also be considered:
(1) Crack bridging performance test (ASTM C 836- -89).
(2) Water vapor transmission test (ASTM D 1653-93 or GB/T 17146-1997).
(3) Anti-carbon dioxide diffusion test.
(4) Flexibility test (GB/T 1731).
(5) Determination of tensile strength and elongation
① Cast a film on release paper, control the dry film thickness to 375~400μm, and make it in two steps, each with a thickness of 185~200μm. The interval between the two courses is 24h.
② After drying for 7 days, peel off the coating and cut into strips.
③Use a Tensile Testing Machine to carry out a tensile test to measure the tensile strength and elongation, and the tensile speed is 100~50mm/s.
