Waterproof coating is a kind of viscous liquid polymer synthetic material without certain shape at room temperature. After coating, a tough hydrophobic coating can be formed on the base surface by solvent evaporation, water evaporation or reaction curing. Waterproof coatings for construction include silicone waterproof coating, silicone rubber waterproof coating, cement-based penetration crystal waterproof coating, water-based environmental protection bridge waterproof coating. Performance standards such as low temperature flexibility and impermeability can be tested by certain testing methods.

1. Look at building waterproof paint! Type 1 waterproof paint for construction.

Silicone waterproof coating is a water-soluble silicone resin as the base material, using high-tech emulsion made of building waterproof coating. Silicone waterproof coating is a water-emulsion waterproof coating made of silicone rubber emulsion or other emulsion as the base material, with water, weapon filler and various auxiliaries. The coating has the outstanding characteristics of waterproof and permeable waterproof material, and has excellent water resistance, permeability, film forming, elasticity, sealing, elongation and low temperature resistance.

2. Silicone rubber waterproof coating silicon

Rubber waterproof coating is a kind of water-based waterproof coating with silicone rubber emulsion and other emulsion complex as the main equipment, adding inorganic filler, crosslinking agent, catalyst, reinforcing agent, defoamer and other chemical additives. The product has the excellent performance of both coated waterproof coating and saturated waterproof coating, with water resistance, permeability, film formation, elasticity, sealing and low temperature resistance. The base deformation adaptability is strong, deep in the base, and the base combination is firm. Engineering grinding, polishing, spraying is convenient, film forming speed is fast. Can be used for wet base construction, non-toxic, tasteless, non-combustible, safe and reliable, with a variety of colors of waterproof paint, easy to maintain. Silicone rubber waterproof coating is a kind of water-emulsion waterproof coating with water as the dispersion medium. After dehydration and hardening, polymer compounds with network structure are formed. After the surface of each base layer is coated with waterproof coating, the particle density increases and the fluidity is lost with the infiltration and evaporation of water. As the drying process continues, excess water is lost and the emulsion particles gradually contact and condense. Under the action of crosslinking and catalyst, the crosslinking reaction was carried out, and finally uniform and dense rubber elastic continuous film was formed.

With the development of organic waterproof coatings, waterproof coatings for weapons are also developing. At present, inorganic waterproof coatings have become a research hotspot. It is one of the focuses of environmental materials development in the 21st century.

There are two types of waterproofing coatings for weapons: coated waterproofing coatings and penetrant crystalline waterproofing coatings.

1. In the process of engineering application and development, it is first advocated to use cement-based penetrant crystalline waterproof coating to waterproof the inner surface of the building. Especially suitable for sewage treatment plants, surface living reservoirs and other similar projects.

Since the 1960s, as an effective waterproofing method for the back of concrete structures (internal waterproofing method), cement-based penetrant crystalline waterproofing coating has gradually expanded its variety and entered a new field of application in construction engineering. At present, cement-based permeable crystalline waterproof coatings have been widely used in underground structures of industrial and civil buildings, public transportation railways, bridge paving, drinking water plants, sewage treatment plants, hydropower stations, nuclear power plants, water conservancy projects and other fields. Good permeability, strong adhesion, steel corrosion resistance, harmless to human body, convenient construction.

2. Water-based environmental protection bridge waterproof coating is a new type of bridge waterproof coating, which has the advantages of good water solubility, non-toxic, pollution-free, high bond strength, good elasticity, wide range of high and low temperature, low price, etc. This product is made of high quality petroleum asphalt as the base material, rubber polymer material as the modifier and water as the medium. It is produced by catalyst, cross-linking, emulsification and other technologies, which changes the traditional production process.

3. Main advantages: The ratio of insulation material ar polymer emulsion to cement can be adjusted to meet the flexibility and strength requirements of different projects, and the construction method is convenient. This kind of waterproof coating uses water as dispersant to solve the environmental pollution and harm to human health of solvent-based waterproof coating such as tar and asphalt. Therefore, in recent years, it has developed rapidly at home and abroad and has become a rising star in waterproof materials.

4. Silicone acrylic exterior wall coating Silicone exterior wall coating is the abbreviation of silicone acrylic exterior wall coating. It is a new high-grade exterior wall coating with strong weather resistance (service life of more than 10 years) and strong pollution. It is widely used as a waterproof coating. The latex paint is non-toxic, pollution-free to the environment and harmless to human body. Building materials that meet the current environmental requirements are the replacement products of coatings. Polyurethane waterproof coatings test method 1.

1. Manufacturing. Test polishing tools: coating templates; Electric air drying box: control accuracy 2.

2. Experimental stage:

(1) Before the experiment, the bellows, tools and paint should be placed under standard experimental conditions for more than 24 hours.

(2) Measure the amount of sample required to ensure the final coating thickness (1.50.2) mm.

(3) Hire a single test material to mix the fireproof paint evenly, accurately weigh the multi-liquid fireproof paint according to the manufacturer’s regulations, and then mix the test material evenly. According to the need, the amount of diluent can be the amount specified by the manufacturer, and when the amount of diluent is in a range, the intermediate value can be used.

(4) After the product is mixed, fully mix for 5 minutes, pour into the contact box to avoid mixing bubbles. The mold frame will not deform and the surface is smooth. In order to facilitate hair loss, you can first treat with hair removal agent before applying. According to the requirements of the manufacturer, the sample should be painted more than once (up to 3 times), with each interval not exceeding 24h. The surface should be levelled one last time and then cured.

(5) Curing conditions of coating preparation: timely demoulding as required, and after demoulding, the coating is turned over for curing to avoid the demoulding process. Non-destructive coating. In order to facilitate demoulding, it can be carried out at low temperatures, but the demoulding temperature should not be lower than the low temperature flexible temperature.

2. Impermeability test.

1. Testing instrument: impermeability meter; The aperture is 0.2 mm. Experimental steps:

(1) Cut three specimens of about (150150)mm, place them for 2h under standard test conditions, fill the device with water at a temperature of (235), and completely exclude the air in the device.

(2) Place the specimen on the permeable plate, add a metal mesh of the same size to the specimen, cover the 7-hole original plate, and slowly clamp until the specimen is clamped on the plate. Dry the non-contact surface of the reagent with a cloth or compressed air and slowly apply pressure to the specified pressure.

(3) After reaching the specified pressure, maintain the pressure for (302)min. The water permeability of the sample is observed during the test (a sudden drop in water pressure or water on the non-facing surface of the sample).

Polymer waterproof coating test method:

I. Sample and sample preparation. Weigh an appropriate amount of liquid and solid components of the sample, place them under standard test conditions according to the proportion specified by the manufacturer, for 5min, mechanically stir for 5min, let them stand for 1 to 3 minutes to reduce bubbles, and then pour them into the coating mold frame specified in the “Polyurethane Waterproof Coating Test Method” for coating. In order to facilitate release, the surface of the film can be treated with release agent. The sample is coated twice or three times during preparation, and the latter coating should be carried out after the former coating is dried, and the interval time of the two passes is (12~24) h, so that the sample thickness can reach (1.5±0.50) mm. The surface of the last coated specimen is scraped flat, left for 96h under standard conditions, and then unmolded. The demoulded sample was treated in a drying oven at (40±2) ℃ side up for 48 hours, and then placed in a dryer to cool to room temperature.

two Water impermeability testing

The prepared sample was cut into 3 pieces (150×150mm) after curing, and tested according to the prescribed test instruments and methods for impermeability test. The test pressure was 0.3MPa and the pressure was maintained for 30min.

Testing standard for building waterproof coatings

1. Extensibility Extensibility is mainly to make all kinds of waterproof coating have a certain ability to adapt to the deformation of the base layer, so as to ensure the waterproof effect.

2. Low temperature flexibility Too high temperature will make the paint flow, too low temperature will make the paint crack, so low temperature flexibility is also a basic indicator of the paint.

3. Impermeability For the top ten brands of waterproof coatings, impermeability is the most important performance. If the quality requirements cannot be met, there will be direct leakage of the waterproof layer after completion.

4. Solid content Solid content refers to the quality of the solid phase in the slurry components, which is the main film-forming substance of various waterproof coatings. If the solid content of the paint is too low, the quality of the film is difficult to be guaranteed.

5. Heat resistance under the highest atmosphere conditions in summer, the temperature of the roof surface of the rock sheet paint can reach 70 ° C, if the heat resistance of the paint is less than 80 ° C, and it is not maintained for 5 hours, then the film will produce flowing, bubbles and sliding phenomena, affecting the waterproof effect.