The waterproof coating film has good waterproof performance and is especially strong in environmental adaptability. it can form a seamless and complete waterproof film regardless of various complicated and irregular parts.At the same time, it has the advantages of no need of large-scale mechanical processing, less investment, convenient construction and no need of heating and boiling, thus reducing environmental pollution and labor cost.The biggest advantage of coating film is that it is light in weight and convenient to operate. no matter it is a complex situation such as plane, inclined plane, vertical plane, irregular surface, it can form waterproof coating film to prevent leakage.
I. The selection of new waterproof coating
The asphalt-based waterproof coating is mainly suitable for waterproofing of industrial and civil building roofs, concrete basements and toilets with class iii and iv waterproof grades due to its little modification.The high polymer modified asphalt waterproof coating is modified by synthetic high polymer, which has enhanced durability, improved adhesion, increased elongation, improved resistance to high and low temperatures, and is more green and environmentally friendly. it is suitable for waterproof projects of grade ii, iii, and iv waterproof grades.Synthetic polymer waterproof coating refers to a one-component or multi-component waterproof coating made of synthetic rubber or synthetic resin as the main film-forming substance.This kind of waterproof coating is suitable for the high standard requirement of waterproof coating in the construction industry under the new situation.Both environmental protection, high and low temperature resistance, elongation and durability have been greatly improved.Common varieties include polymer cement coatings, polyurethane waterproof coatings and silicone waterproof coatings.It is suitable for mine, basement, swimming pool and buildings that have eroded in water for a long time.
II. Application of new materials
1, polymer modified asphalt waterproof coating
Polymer modified asphalt consists of two parts: polymer and asphalt base. polymer has good compatibility with asphalt, which can impart some characteristics to asphalt and further improve the performance of asphalt.Polymer modified asphalt waterproofing membrane is mainly coated with SBS, SBR, app, AIA 0 and other polymer modified asphalt.Aiming at the traditional method of boiling asphalt in an iron pan to make waterproof, the technology is upgraded and the asphalt is modified into a waterproof coating which can be directly painted.Has the advantages of low cost, no pollution and convenient construction, and eliminates the complicated working procedure of boiling asphalt in an iron pan.
2, polymer cement waterproof coating
Polymer cement waterproof coating is a one-component or two-component water-based building waterproof coating made of polymer emulsion and cement as main raw materials and sand and other additives.Polymer cement waterproof coating combines the advantages of polymer and cement, and has the characteristics of " combination of hardness and softness", that is, it not only has the extensibility and water resistance of polymer coating film, but also has the advantages of high strength of hydraulic cementing material, strong adhesion with wet base layer, and good water resistance.The coating uses water as a dispersion medium, which solves the environmental pollution caused by the use of solvent-based waterproof coatings such as tar, asphalt and solvents and the harm to human health.The new polymer cement-based waterproof material is made up of organic polymer liquid material and inorganic powder. it combines the characteristics of high elasticity of organic material and good durability of inorganic material. after coating, it forms a high-strength and tough waterproof coating film, which is a common choice material for family prevention.
3, polymer emulsion waterproof coating
Polymer emulsion waterproof coating is one of the synthetic resin emulsion architectural coatings. it is usually a thick waterproof coating based on acrylate homopolymer emulsion, styrene-acrylate copolymer emulsion or ethylene-vinyl acetate ( vae ) emulsion. according to the formulation design and configuration principle of the synthetic resin emulsion coating, various water-based coating additives are used, and pigments and fillers are appropriately added to prepare the thick waterproof coating with water dispersion medium.The biggest feature of the polymer emulsion waterproof coating is its environmental safety. the coating is non - toxic, has no adverse environmental impact, is safe in construction, convenient to operate, has no adverse effect on the health of construction personnel, and does not have strict requirements on the moisture content at the grassroots level, etc.This kind of waterproof coating has excellent physical and mechanical properties.
4, polymer waterproof material
Polymer waterproof materials refer to materials that use polymer compounds as matrix components.Polymer waterproof materials can be divided into natural polymer materials and synthetic polymer materials according to their sources.According to their chemical composition, they can be divided into organic polymer waterproof materials and inorganic polymer waterproof materials.According to their properties, they can be divided into general polymer waterproof materials and new polymer waterproof materials.The main reason why polymer waterproof materials develop faster than traditional waterproof materials is that they are rich in raw materials, convenient to manufacture, easy to process, various in varieties, various in forms, excellent in performance, low in investment required in production and application fields, and relatively significant in economic benefits.The synthetic polymer water-based emulsion waterproof coating film is made of a variety of polymer materials as main film-forming materials, adding thixotropic agents, anti-sag agents, anti-precipitant agents, thickening agents, leveling agent, anti-aging agents and other additives and catalysts, and processed by a special process, and has excellent high elasticity and excellent waterproof performance.Its characteristic is green and environment - friendly.Compared with other solvent-based waterproof coatings and waterproofing membranes, waterproof materials are extremely safe.Innocuous and tasteless have no adverse effects on the environment and the health of people.Excellent aging resistance and stable performance under the action of ultraviolet rays, light, heat and oxygen, and the service life of the material is over 20 years.It has excellent repairing and bonding properties to common building materials such as concrete base, glass, ceramic, plastic, metal, asbestos tile, floor tile and original waterproof material base surface, and has extremely strong bonding force.Does not peel off or delaminate under the action of external force, and can form a stable waterproof whole;Due to the good permeability of the material, it can penetrate into the pores of the cement-based material when brushing the material, blocking the water seepage passage, and the waterproof effect is reliable;The elongation at break is not less than 600 %, which is excellent in crack resistance and has a very high shielding effect on the cracks of the base layer. even if the base layer generates small cracks due to external factors, the phenomenon of fracture and leakage will not occur.High temperature resistance can reach 170 deg c without flowing and low temperature - 20 deg c without embrittlement;The color can be blended according to the design requirements and the needs of users, thus having excellent heat insulation, heat preservation and decorative and beautification effects.Therefore, that decorative and multifunctional waterproof material can form a continuous waterproof layer by brush and scraping on any regular or irregular base surface.It can be constructed on wet base surface, has no foaming, good film forming effect, fast curing, and can effectively shorten the construction period.It is suitable for wall surface, plate seam, window edge, window sill, column edge, pipe trench pipeline, grain depot, water tower, swimming pool, tunnel, steel structure workshop roof, power plant cooling tower inner wall waterproof, etc. it is suitable for the construction of building climate regions all over the country.
5, polyurethane waterproof coating
Polyurethane waterproof coating is usually a liquid two-component reaction curing coating or a one-component moisture curing coating.The first component of the two-component polyurethane waterproof coating is a hydroxyl-terminated blocked polyisocyanate prepolymer, and the second component is a curing agent. during construction, the first and second components are evenly mixed, and an elastic seamless waterproof coating film can be formed within a few hours after construction.The polyurethane waterproof coating can be applied at normal temperature, cured at normal temperature, easy to operate, and has strong adhesive force of the coating film. it has good physical and mechanical properties and excellent waterproof, acid - resistant, alkali-resistant and aging-resistant properties, and is suitable for waterproof construction of roofs, basements and other structural parts, especially for roof waterproof projects with complicated shapes.
6, nano composite waterproof coating
Adding nano-materials to the coating can improve the anti - aging, anti-leakage and anti-washing properties of the coating, thus improving the grade of the coating and prolonging the service life of the coating film.The appearance of the waterproof coating product modified by the nano-material appears more full and even, the coating film is bright and clean and fine, the touch feeling is excellent, the waterproof property is good, and the adhesive force with the base layer is greatly improved, especially the ultraviolet ray resistance and scrubbing resistance of the modified coating are very superior.
III. Summary
Building waterproof technology plays a function guarantee role in building construction. the quality of waterproof engineering is not only related to the service life of buildings, but also directly affects people's production, living environment and sanitary conditions.Therefore, in order to ensure the quality of building waterproof engineering, we should pay more attention to its construction technology and key points in addition to the correct selection of waterproof materials.
(sourcing:network)
