Research on composite properties of modified bitumen waterproofing membrane and roofing acrylic waterproof coating

Polymer modified bitumen waterproofing membrane is the most widely used waterproofing material in China, but most common modified bitumen waterproofing membrane or self-adhesive modified bitumen waterproofing membrane cannot be used exposed, because exposed use will cause accelerated material aging. The appearance of bulging, cracks, etc., seriously affects its waterproof function; and the modified asphalt waterproofing membrane that can be exposed to use is usually covered with mineral granules or fine sand, and the surface is easy to fall off over time, and it is not beautiful.

structural and rheological characterization of wax modified bitumen

Roof acrylic waterproof coating is a single-component waterproof coating made of high-quality acrylate multi-copolymer emulsion as base material, supplemented by selected pigments and fillers through scientific ratio processing. The coating film has excellent elasticity, adhesion, excellent UV-resistant and light-reflecting properties for long-lasting protection on a wide variety of substrates.

Here, the roofing acrylic waterproof coating is applied to the surface of various modified bitumen membranes and self-adhesive modified bitumen membranes to form a protective coating film on the surface of the membranes, and tests are conducted to verify whether it can be modified bitumen Waterproofing membranes provide effective protection and increase aesthetics.

1) When the roof acrylic waterproof coating is painted on the surface of the SBS modified bitumen waterproof membrane on the PE membrane, under the condition of natural exposure, the bitumen oil in the modified bitumen membrane will enter the acrylic waterproof coating in a short time. , resulting in the yellowing of the coating film and the decrease in adhesion; increasing the thickness of the coating film can appropriately reduce the degree of yellowing, but cannot completely prevent it; at the same time, increasing the thickness of the coating film can appropriately improve the overall performance and bonding ability of the coating film , but cannot completely avoid the warpage of the waterproof coating film and the coil at the edge. Therefore, it is not recommended to apply the roofing acrylic waterproof coating on the surface of the SBS modified bitumen waterproofing membrane on the PE membrane surface, and the long-term combined use of the two may cause the risk of falling off.

2) When the roof acrylic waterproof coating is painted on the surface of the SBS modified bitumen waterproofing membrane on the sandy surface, under the condition of natural exposure, after a period of time, the originally white acrylic waterproof coating will turn slightly yellow, and with time The phenomenon of prolonged yellowing is aggravated, but it does not affect the adhesion between the waterproof coating film and the coil material, and the adhesion between the waterproof coating film and the coil material is good; since the sand surface SBS modified bitumen waterproofing membrane itself can be used exposed, therefore, If you want to protect the sand layer and add a waterproof layer by applying acrylic waterproof paint, you can apply it; but it is not recommended to apply acrylic waterproof paint to change the color of the roof.

3) Apply the roofing acrylic waterproof coating to the surface of the SBS modified bitumen waterproofing membrane on the surface of mineral granules. Under the condition of natural exposure, except for normal material aging, there is no change in the appearance and bonding ability of the two. If the roofing project needs to add a waterproof layer or protect the coiled shale layer and change the color of the roof, a composite construction of the two can be used.

4) Apply the roofing acrylic waterproof coating on the surface of the self-adhesive bitumen waterproof membrane with cross-laminated polyethylene film. Under natural exposure, when a thin coating of 0.2 mm is used, the waterproof coating film cannot waterproof the self-adhesive modified bitumen. The coil forms absolute protection. Without the concrete protective layer, the self-adhesive coil will still bulge and produce wrinkles; when it is coated with 1.0 mm thick acrylic waterproof coating, it can effectively solve the self-adhesive waterproof coil. During the 2-month test period, the coating did not show yellowing and unreliable bonding, but the continuous bonding performance needs to be verified for a longer time.