First, according to the liquid type of the paint
According to the liquid type of the coating, the waterproof coating can be divided into three types: solvent type, water emulsion type and reaction type.
Solvent type waterproof coating
In such a coating material, a polymer material as a main film-forming substance is dissolved in an organic solvent to form a solution. The polymer material is stored in a solution (coating) in a molecular state;
The coating has the following special features: the film is volatilized by the solvent volatilization, the molecular chain contact and lap joint of the polymer material; the coating is fast drying, the conjunctiva is thin and compact; the production process is simple, and the storage stability of the coating is good; Burning, explosive, toxic, safety, production, storage and use; due to the rapid evaporation of solvents, the environment is polluted during construction.
2. Water emulsion type waterproof coating
Such a water-repellent coating material as a main film-forming material is stably suspended (not dissolved) in water as a macroscopic particle (rather than in a molecular state) to form an emulsion paint.
The coating has the following characteristics: the film is converged by evaporation of water, through the process of solid particles approaching, contacting, deforming, etc.; the coating is dried slowly, the compactness of the film formation is lower than that of the solvent-based coating, and generally it is not suitable for construction below 5 ° C; The period generally does not exceed half a year; it can be applied on a slightly moist base; non-toxic, non-combustible, safe to produce, store, transport and use; easy to operate, does not pollute the environment; low production cost.
3. Reactive waterproof coating
In such coatings, the polymer material as the main film-forming material exists in the liquid form of the prepolymer. The coating material is mostly composed of two components or one component, and contains almost no solvent.
Such a coating has the following characteristics: a liquid polymer prepolymer chemically reacts with a corresponding substance to become a solid matter (conjunctiva); a thick coating film can be formed in one piece, no shrinkage, and the coating film is dense; The sub-coating needs to be accurate on site 1:2; the mixing is uniform to ensure the quality; the price is more expensive.
The original waterproof material for polyurethane waterproof coatings is tar pitch and petroleum blue paper tire felt, which originated in Europe and was introduced to China in the 1920s. With the advancement of technology, modern waterproof materials have developed rapidly. In the 1970s, various high-minute anti-water materials were introduced. China's waterproof materials gradually form three series of coils, coatings and sealing materials.
The synthetic polymer waterproof material is a waterproof coating material prepared by adding synthetic rubber or contract resin as a main film-forming substance and adding other auxiliary materials.
Synthetic molecular waterproofing materials are available in a variety of brands, such as polyurethanes, acrylics, and mixtures thereof.
to add on
Classification
Waterproof coatings can be divided into: polymer polymer modified asphalt waterproof coating, synthetic polymer waterproof coating and organic-inorganic composite waterproof coating according to film forming materials. It is used in building roofs, toilets, underground and waterproofing projects with anti-seepage and moisture-proof requirements. Because it forms a continuous seamless waterproof membrane after curing, it is especially suitable for waterproofing and moisture-proofing of multi-node or special-shaped parts.
2. Policy orientation of waterproof coatings
In the announcement of the “Eleventh Five-Year Plan†for the promotion and application of the prohibition on the use of technology (the first batch) issued by the Ministry of Construction, polyurethane waterproof coatings, pure acrylic waterproof coatings, spray polyurea waterproofing technology and polymer cement waterproof coatings are listed. In order to promote the application of products (the first batch); tar type polyurethane waterproof coating, water-based polyvinyl chloride tar waterproof coating (also known as PVC grease) is listed as a waterproof project prohibited for building construction.
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