Waterproof material for metal roof and preparation method of waterproof material

Abstract

The invention discloses a waterproof material for a metal roof and a preparation method of the waterproof material. The waterproof material comprises the following components in parts by weight: 430 to 470 parts of an AE960 pure acrylic emulsion, 100 to 150 parts of silica sol, 400 to 450 parts of a modified nano filler, 5 to 6 parts of a mineral oil defoamer, 1.5 to 2 parts of a preservative, 1.2to 1.8 parts of a thickener and 85 to 100 parts of a water-based solvent. The preparation method of the modified nano filler comprises the following steps: adding nano calcium carbonate, nano bariumsulfate, nano titanium dioxide and nano zinc oxide into a polysiloxane-acrylate copolymer emulsion, performing stirring at 75 DEG C for 3 hours, adding a surfactant, performing ultrasonic dispersion for 15 minutes, and performing low-temperature drying so as to obtain modified nano calcium carbonate. The waterproof coating disclosed by the invention is applied to a metal roof, and is excellent inmechanical property, high in tensile strength, high in elongation at break and excellent in tear resistance; the stripping performance is excellent, and the stripping strength of 0.3 MPa or above canbe resisted; the bonding strength is high, and the coating can be tightly bonded with a metal base surface; and the low-temperature flexibility is good, and cracks are avoided after folding at -30 DEGC.

Description

technical field [0001] The invention belongs to the field of waterproof materials, and in particular relates to a waterproof material for metal roofs and a preparation method thereof. Background technique [0002] Metal roofing refers to the use of metal sheets as roofing materials, including galvanized sheets, galvanized sheets, aluminum alloy sheets, aluminum-magnesium alloy sheets, titanium alloy sheets, copper sheets, stainless steel sheets, etc. At present, metal roofs are widely used in industrial and public buildings. The total area of ​​existing metal roofs in the Asia-Pacific region is about 6.7 billion square meters 2 , accounting for about 15% of the entire roof system, the annual growth rate of new metal roofs remains between 4% and 5%, but due to perennial wind and sun, thermal expansion and contraction, and various corrosion reasons, a large number of roofs have leaked. leakage problem. [0003] In the prior art, waterproof coiled materials and waterproof coa...

AI Technical Summary

Problems solved by technology

At present, metal roofs are widely used in industrial and public buildings. The total area of ​​existing metal roofs in the Asia-Pacific region is about 6.7 billion square meters 2 , accounting for about 15% of the entire roof system, the annual growth rate of new metal roofs remains between 4% and 5%, but due to perennial wind and sun, thermal expansion and contraction, and various corrosion reasons, a large number of roofs have leaked. leakage problem

[0003] In the prior art, waterproof coiled materials and waterproof coatings are mainly used to protect metal roofs, but the seams between waterproof coiled materials and metal roofs generally need to be heat-welded, and the cost is relatively high. The operation of coating waterproof coatings is simple and the construction difficulty is low, but There is a problem of poor compatibility between the organic polymer emulsion and the inorganic filler in the coating, coupled with the long-term exposure to the sun and rain in the outdoor environment, the waterproof coating film is very easy to age and crack, and at the same time, the inorganic filler falls off from the surface of the waterproof coating film. Affect the protective effect

For example, the patent application number CN201510643843.8 discloses a flame-retardant metal roof waterproof coating and its preparation method. The waterproof coating is simply prepared by mixing polymer emulsion and fillers. Due to the gap between the organic phase and the inorganic phase Poor compatibility, prone to phase delamination, and the mechanical properties of the formed coating film need to be improved

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