(2) Maintenance-free and self-cleaning-Fluorocarbon coating has extremely low surface energy, surface dust can be self-cleaned by rainwater, excellent hydrophobicity (maximum water absorption is less than 5%), oil repellency, extremely small friction coefficient (0. 15-0. 17), no dust adhesion and no scaling, and good antifouling performance.
(3) Strong adhesion-Excellent adhesion on the surfaces of metals such as copper and stainless steel, plastics such as polyester, polyurethane and vinyl chloride, cement and composite materials. , and basically shows the characteristics that it should be attached to any substance. High decoration-in the 60-degree glossometer, it can reach more than 80% high gloss.
(4) Ultra-long weatherability-the coating contains a large number of F-C bonds, which determines its super stability, no pulverization and no fading, and its service life is as long as 20 years, which is superior to any other coating. Excellent workability-two-component packaging, long storage period and convenient construction. Precautions 1. The prepared fluorocarbon coating must be used up within 5 hours to avoid failure beyond the activation period;
2. Fluorocarbon paint should be kept dry, waterproof, leak-proof, sun-proof, high-temperature resistant and away from fire sources;
3. After opening the can, filter it with 120-200 mesh and use it;
4. Construction temperature: 0-35℃ is appropriate, and the relative humidity is less than 80%. Comparative advantage 1. Compared with traditional coatings, it has better light resistance and weather resistance;
2. Compared with the traditional aluminum-plastic panel for exterior walls, it is easier to operate and renovate, and it is not limited by the shape of the building, so that designers can exert their imagination;
3. The cost is much lower than that of aluminum-plastic board, and the same effect can be achieved;
4. The weight is light, which will not bring a heavy burden to the wall, and there will be no danger that the aluminum-plastic plate will fall. Construction requirements and storage (1) Before painting, the dust, oil stain and rust on the surface of the object must be cleaned to ensure the painting quality. It is forbidden to bring moisture into the construction.
(2) The coating ratio is: component A (base material) and component B (curing agent) = 1 (barrel): 1 (barrel).
(3) The construction proportioning method is as follows: Open the component A, add the component B into the component A, and fully and evenly stir. Curing for 30 minutes, and then painting can be carried out.
(4) This material is required to be readily available and cannot be stored for a long time. The mixed paint must be used up within six hours. Unfinished materials should be sealed and preserved. (5) Fine weather should be chosen for construction, and construction under the conditions of wind, sand, rain and snow should be avoided. The optimum coating temperature is 5-30℃. When it rains, fogs, snows or the relative humidity is more than 75%, the construction shall be stopped.
(6) During construction, if the coating is too thick, special thinner can be used to adjust the construction viscosity.
(7) Fluorocarbon paint products should be stored in a cool and dry place to prevent direct sunlight, isolate fire sources and stay away from heat sources.
Construction technology of fluorocarbon paint
The construction technology of fluorocarbon coatings varies with different spraying materials. Construction technology of external wall with fluorocarbon paint is for reference only.
First, grassroots requirements
1. The quality of plastering and concrete at the grass-roots level shall comply with the Code for Construction and Acceptance of Building Decoration Engineering (JGJ).
2. Plaster layer or concrete surface layer (including parting, around the window frame, etc.). ) should be free of dust.
3. The surface of the base must be firm, without crispness, crack and shelling, with flatness ≤2mm, and without floating dust and adhered particles at the base. 4. The moisture content of plaster and concrete base coating shall not be greater than 10%, and the PH value shall not be higher than 9. The newly painted cement mortar wall shall be maintained for more than 10 days in summer and 20 days in winter, and the cast-in-place concrete wall shall be maintained for more than 2 1 day in summer and 28 days in winter.
Second, the base surface treatment
1. Check the flatness of the wall. Large protruding parts need to be polished and leveled, and large depressions or holes need to be filled and leveled with cement mortar.
2. Dig the larger cracks in the wall and fill them with high-elastic putty several times continuously until the wall is smooth and the putty is dried and polished.
3. Use a brush, shovel or sandpaper to remove the particles and sundries on the wall, and remove the loose cement layer on the wall.
4. The processed products shall meet the requirements of flatness ≤2mm.
5. The wall is basically clean, free of floating dust and adhered particles.
3. Fluorocarbon paint 1 full batch of anti-crack putty. Adopt fluorocarbon paint anti-crack putty: special additive for fluorocarbon paint anti-crack putty: water = 20; 1; 8 for the deployment of putty, putty must be fully stirred evenly with a hand drill. 2. The longest storage time is 4 hours, and it shall not be used after 4 hours, and the solidified slurry shall not be used; Check the particles and dust on the wall surface and clean it up.
3. Drag putty with a two-meter-long aluminum alloy guide rule, scraping vertically first, and then scraping horizontally. The running speed and strength of the guide rule should be balanced, otherwise waves will form along the direction of the guide rule movement, which will affect its flatness.
4. Paste the decorative tape, divide the frame as required, put putty on the frame after dividing the frame, and then tear off the tape one by one.
5. Putty is generally embedded for 4-5 times; 6. The putty layer is polished after drying (generally no more than 4 hours).
If the time is too long, the putty will be difficult to be sanded (wasting manpower and sandpaper), and the rough and greasy surface must be polished clean, otherwise the subsequent construction will waste a lot of putty.
6. Sandpaper with 120 mesh or 150 mesh should be used for grinding.
7. After the putty is polished, the uneven wall surface should be completely eliminated, and at the same time, the external angle and waistline should be straightened.
Fourth, polishing putty construction
1. polish the putty on the polished putty.
2. No scratches are required on the surface, especially on the wall near the corner of Yin and Yang, drip line, windowsill and downspout.
3. Straight line, straight Yang Angle, no defects.
4. There is no powder falling when digging with nails, and the bonding force is qualified.
5. Smooth feel, no bumps.
Verb (abbreviation of verb) primer spraying
1. Check whether the putty meets the requirements, and repair it in time when problems are found.
2. Spray primer (air pressure 5-8kg/cm2, spray without water) on the completely dry wall (the wall should be dry and the water content of the wall should be less than 8%).
3. It is required to spray evenly, without leakage, with uniform color and no blooming. Strong winds (above level 6) and rainy days cannot be used for construction. 4. Primer is sprayed once, and after spraying, it is found that there are a lot of scratches or bee eyes on the wall, which must be polished to meet the requirements.
5. When grinding, 280 mesh or 360 mesh water mill sandpaper should be used, and care should be taken not to wear through the coating.
6. Dust should be removed after polishing, and the dust generated by wall polishing should be wiped clean with a rag. If the dust removal is not thorough, the smooth coating of fluorocarbon paint will not be achieved after construction.
7. After the primer is sprayed, it should be uniform in color, smooth in surface and free from dust and other stains.
Six, fluorocarbon topcoat spraying
1 .. Primer must be completely dry, and there must be no dust and other sundries on the wall.
2. Construction proportion: main paint: curing agent: diluent = 10: 1: 2.
3. The prepared fluorocarbon paint must be filtered with 200-mesh gauze, and the diluent should be constantly stirred during placement to avoid precipitation.
4. Spray gun model: W-77, nozzle size: 1.5-2.0mm, air pump pressure: 0.3-0.5Mp.
5. The coordination of spraying quantity, spraying area, spraying base surface and hanging cage distribution should be considered during construction. Considering the actual situation of this project, construction personnel should be arranged to spray at the same time, and the thickness of spraying should be as thick as possible on the premise of ensuring no sagging. 6. Do a good job of anti-pollution and anti-virus, and protect the downpipe. Workers should wear protective articles such as gas masks and gloves during construction, and fireworks are strictly prohibited; Spraying should be uniform, with reasonable density, without sagging, uneven light and shade, hair loss and other phenomena. Delicate feel, uniform luster, no scratch marks and unevenness.
The Development of Fluorocarbon Coatings at Home and Abroad 1938 Dupont Company of the United States synthesized PTFE resin and developed a Teflon non-stick coating. PTFE is dispersed in a solvent in the form of particles, and then sintered at a high temperature of 360-380℃ to form a film. The coating can be used for a long time at-195-250 oc with high resistance. Such as: non-stick pan coating, polymerization kettle lining, etc.
In 1960s, Elfawato Company developed polyvinylidene fluoride (PVDF) fluorocarbon resin with "Kynar500" as the trademark, and then applied it to fluorocarbon coatings. It has excellent weather resistance, water resistance, pollution resistance and chemical resistance, and is especially used for exterior decoration of buildings, which has incomparable advantages over other coatings. However, PVDF resin is insoluble in common solvents, and the formation of coating film requires high-temperature sintering at 230-250oC, so it can only be applied to the base materials of high-temperature resistant exterior wall decoration materials such as aluminum curtain wall panels, aluminum profiles and color steel plates with fixed processing sites and baking equipment, which limits its use.
1982, Asahi Glass Company of Japan developed fluoroolefin-vinyl ether * * * polymer (FEVE) resin, which introduced soluble functional groups, adhesive functional groups, cross-linking curing functional groups and rheology promoting functional groups on the basis of fluoroolefin. It not only inherits all the excellent qualities of fluororesin, but also has the properties of being soluble in conventional solvents such as aromatic hydrocarbons, lipids and ketones at room temperature and being cross-linked and cured at room temperature. The application of the resin in fluorocarbon coatings extends the application field of fluorocarbon coatings to organic materials, such as PVC profiles, plastic-steel profiles, glass fiber reinforced plastics, plexiglass and so on. Large steel plates and steel structures that cannot enter the oven; Road and bridge structures and building external walls that need on-site construction; And non-ferrous metals, glass materials, ceramic products, stone and wood.
In the middle and late 1990s, waterborne fluorocarbon emulsion resin was successfully applied to fluorocarbon coatings. Its high temperature resistance, water resistance and pollution resistance are not inferior to solvent-based fluorocarbon coatings; Its environmental protection makes it easy to break through the environmental barriers of some European and American countries; Its easy construction makes its labor and material cost even lower than that of solvent-based fluorocarbon coatings with the same high quality. Waterborne fluorocarbon coatings have become the main development direction of architectural coatings.
With the progress of human beings and the development of science and technology, fluorocarbon coatings are also making progress. The scientific and technological achievements that have just come out and are still in the research stage are: hydrophilic self-cleaning anti-pollution fluorocarbon coatings, flame retardant and fireproof fluorocarbon coatings, wear-resistant and lubricating fluorocarbon coatings, fluorescent fluorocarbon coatings, electrothermal fluorocarbon coatings and other functional fluorocarbon coatings; Powder fluorocarbon coating; Waterborne fluorocarbon wood coatings: nano fluorocarbon coatings and so on.
At present, there are more than 20 fluororesin manufacturers in the world, covering more than a dozen countries around the world. In 2000, the world production capacity of fluororesin was about 654.38+million tons, and in 2005, the production capacity rose steadily to 654.38+200,000-654.38+400,000 tons. At present, the main manufacturers of fluororesin in the world are DuPont, ICI, Atto Fina, Asahi Glass and Daikin, with an annual production capacity of 3,000 to 20,000 tons. The domestic enterprises producing fluororesin mainly include Shanghai Sanaifu and Changshu Zhonghao, and their production scale is constantly expanding.
From the comparison at home and abroad, foreign countries started earlier in fluorocarbon coatings industry, with mature product technology, standardized market operation, rich application experience and sound experimental data. Typical representatives are: PPG, Daikin, Asahi Glass, etc. Domestic fluorocarbon coatings industry started late, but developed rapidly. In just over ten years, not only Teflon non-stick coatings and high-temperature baked PVDF coatings used abroad for a long time have been developed, but also FEVE fluorocarbon coatings curable at room temperature have been successfully popularized. At the same time, we have firmly grasped the most fashionable water-based environmental protection fluorocarbon coatings and various functional fluorocarbon coatings in the world. Typical examples are: FC-S series solvent-borne fluorocarbon coatings and FC-W series water-borne fluorocarbon coatings of Shanghai Hengfeng Fluorocarbon Materials Co., Ltd. ... Fluorocarbon coatings have been applied in the United States, Western Europe, Japan and other developed countries for more than 70 years, occupying a large market in the field of steel coating. The application of fluorocarbon paint in China's steel field has just started, but domestic paint manufacturers have realized the huge potential market of fluorocarbon paint in the steel field and have done a lot of research and development work. Such as: pretreatment of steel structure substrate, matching of primer and topcoat, construction conditions and control, installation and assembly conditions. It can be expected that with the development of organic fluorine industry and the further improvement of coating technology. The application of fluorocarbon coatings in steel field will be more and more extensive.