Building waterproof and heat-insulating coating for metal roofs and preparation method of building waterproof and heat-insulating coating

Abstract

The invention discloses a building waterproof and heat-insulating coating for metal roofs and a preparation method of the building waterproof and heat-insulating coating. The building waterproof and heat-insulating coating is prepared by mixing the following two groups of components: first components: water, a first thickener, a first dispersant, a second dispersant, a wetting agent, a first defoamer, a second defoamer, multifunctional additives, a preservative, a mildew inhibitor, titanium dioxide, composite heat-insulating powder, filler and functional filler; second components: an antifreezing agent, film forming additives, an emulsifier, water, emulsion, a second thickener, a third thickener, a pH value regulator and tributyl phosphate, wherein the composite heat-insulating powder is acompound formed by mixing and dispersing rectorite powder and potassium hexatitanate whiskers and then performing surface modification. The preparation method comprises the following steps: firstly,pre-dispersing the first components to obtain slurry with a fineness of 40-80 microns, then adding the second components for paint mixing, and filtering to obtain a finished product. The building waterproof and heat-insulating coating provided by the invention has advantages of simple production process, low cost, easy construction, short construction period, water-based environmental protection,no toxicity and noninflammability, can be widely applied to water prevention and heat insulation of metal roofs.

Description

technical field [0001] The invention relates to a building coating, in particular to a building waterproof and heat-insulating coating for metal roofs, and a preparation method of the coating. Background technique [0002] Metal roof has the characteristics of light weight, high strength, flexible design, convenient installation, rich colors, unique shape, etc., which can make the building have a stronger sense of modernity and the atmosphere of the times, and is widely used in industrial buildings and civil buildings. But like other building materials, metal roofs have their weaknesses, and rainwater seepage is one of them. The main reasons are: ① the characteristics of the material itself, ② unreasonable design, and ③ improper construction. [0003] ① The characteristics of the material itself. The early metal roof panels were connected by fasteners. The roof panels were penetrated and fixed by the fasteners, and the metal plates were damaged. The corrosion resistance wa...

AI Technical Summary

Problems solved by technology

However, the thermal expansion and contraction characteristics of metal itself make it inevitable for large-span metal roofs to generate water seepage gaps.

[0004] ② Unreasonable design

The metal profiled roof belongs to the category of structural waterproofing, with strong drainage capacity and weak waterproofing capacity. Once the system structure is defective, leakage problems cannot be avoided

In addition, due to the interconnection of metal components, thermal bridges are likely to be formed if the details are not handled properly, resulting in condensation on the insulation layer or in the room

Water leakage and weak connections often occur on the profiled metal roof. The wave height is too small, and the design is flawed; 3) The structural layer is simple, the airtightness of the enclosure system is poor, and the insulation layer has condensation; 4) The plate connection is weak, and the wind resistance is poor; 5) The roof drainage design does not consider the area Features (meiyu area, typhoon area, snow area), causing waterproof defects

[0005] ③Construction reasons: a) Improper setting of deformation joints

However, there are some unavoidable defects and problems in the production and application of such coatings that use microbeads to realize the reflective heat insulation function:

[0007] (1) For microbead-type functional fillers, because the particle size is generally large, it cannot meet the requirements in some occasions where the fineness of the coating is required.

The most important shortcoming is that due to the brittle and brittle properties of functional fillers, it cannot be produced completely according to the traditional architectural coating process.

This production process has low efficiency, prolonged production time, difficult equipment cleaning, and high investment in equipment

[0008] (2) For the functional fillers of nano-titanium dioxide and modified titanium dioxide, it has a high refractive index and has a good reflection effect on visible light, but poor reflection on infrared light

[0009] (3) For some metal oxides with good radiation performance, their application is greatly limited due to their darker color

[0010] (4) Due to the relatively large size of the bead-type functional filler, it has an adverse effect on the elastic properties and low-temperature properties of the coating film