As we all know, the national environmental protection policy has gradually tightened, the new generation of young consumer main force is increasingly demanding green furniture and environmental protection. Furniture wood products enterprises are facing the biggest paint change in the history of “oil to waterâ€, then how do wood products manufacturing enterprises Do you paint water-based paint under this environmentally-friendly pressure?
Yin Zhiming, deputy general manager of furniture paint of Guangdong Huilong Coating Co., Ltd., told us in detail about the advantages and disadvantages of water-based paint and its transformation.
Step by step analysis is as follows:
1. Drying room upgrade:
To understand the biggest advantage of water-based paint is that it is soluble in water, low in harmful substance content (VOC), and meets national safety discharge standards. Its film-forming substances are mainly derived from water-based resins, and the three elements that affect the drying of water-based paints: temperature, humidity and The fluidity of the air, so water-based coating is particularly important for the upgrading of the drying room, which will determine the final result of water-based paint filming.
How to transform the drying room? The optimum drying temperature of water-based paint is 25-40 ° C, and the humidity is 45%-60%. Therefore, the drying room needs to be heated and humidified or dehumidified to ensure the normal drying of the water-based paint, and the volume of the enterprise is also required. Self-assessment is generally divided into two types: large-scale production of large-scale enterprises can use infrared tunnel or microwave drying. The cost of one-time input of such drying equipment ranges from 500,000 to 5 million, but the shipping efficiency is high. Small, there is also a small and medium-sized enterprise can increase the temperature dehumidifier and humidifier in the traditional drying room, 40m2 drying room puts the equipment into about 20,000 yuan, and the north can use the mantle or the supply tank to add another air. The cycle can be solved, the water-based paint drying is longer than the traditional oil paint drying time (the water-based paint is dried overnight), so the drying period of the dry room product is long, and the dry room area should be larger than the traditional oil paint to be dry. The dry room area will also increase the capacity at the same time. In order to better the surface effect of the water-based paint, it is necessary to configure the pre-leveling to be dried, that is, the sprayed product is to be coated and dried, and then transferred to a professional dry room to be dried. The general pre-flowing bungalow is designed next to the spray booth.
2. Renovation of the spray booth:
The water curtain machine is generally not recommended in the spray booth. First, because the moisture of the water curtain machine will affect the humidity, which will affect the drying of the water-based paint. Second, the water curtain will create more waste water and cause secondary discharge. Specifically, it is generally divided into two types. One is to drain the water curtain machine and the spray booth water to make a simple dry spray booth. The air outlet needs to be properly modified and discharged. The other is to spray the spray booth. The company has made a professional dry spray booth, which has a large investment cost.
3. Use of water-based coating tools:
Water-based paint coating is divided into two types: machine spraying and manual spraying: machine spraying is now more mature on the market, such as reciprocating machine, five-axis machine, spray machine, vacuum spraying machine, etc. There is a certain amount of output support; there is also a manual spray.
a, the traditional spray gun plus diaphragm pump spray without modification, saving costs, but the fluency of the gun is poor
b. The traditional spray gun and the oil supply pressure tank use the pressure to send the paint out of the gun, reduce the air pressure in an appropriate amount, and reduce the rebound of the paint. Save paint costs and equipment investment
c. Komlin high-pressure pump is equipped with high-pressure gun, the film is atomized well, the coating utilization rate is high, and the cost is increased.
Due to the high viscosity of the water-based paint and the smoothness of the spray, it is recommended to increase the pressure tank or use a Kemlin spray gun (mixed air spray) for manual spraying.
4. Cost analysis of water-based coating:
a, labor cost: If UV bottom + water-based topcoat is used, the labor cost of water-based coating will not increase. If water-based paint is used for the closed coating effect, the water-based paint must be re-coated with multiple primers to fill the wooden eye. The labor costs causing sanding and spraying are rising sharply and production efficiency is declining.
b. Coating cost: related to the coating process used. If the coating combination of UV primer and water-based topcoat is used, the overall cost of the paint will be reduced. If the water-based topcoat and ordinary oily topcoat and coating cost are compared separately, Waterborne topcoats are close to the cost of high-grade oily topcoats.
c. Material cost: Mainly increase the cost of equipment and electricity cost.
5, the pain point of water-based paint is difficult:
a, physical properties of water-based paint and oil paint comparison
Feel: The same contrast, the feel of water-based paint is partial lubrication, while the feel of oily paint is smooth and slippery.
Fullness: The water-based paint has a low solid content. Relatively speaking, to achieve the fullness of the water-based paint, when selecting the sandpaper to polish the primer, it must be on the original basis (if the original is 320# sandpaper, Water-based paint should choose 400# sandpaper for grinding).
Water resistance: After placing the wet white cloth on the surface of the water-based paint for 12 hours, observe whether the position of the white cloth is not foaming, no pitting, no water shadow and no white shadow (white shadow that cannot be naturally restored) This is an important indicator of water-based paint, and it is also an indicator that must be achieved in water-based paint. If the water-resistance of water-based paint is not up to standard, the product cannot be promoted in application.
Blocking resistance: In one-component water-based paints, the paint film will become soft at higher temperatures, and when stacked with a certain weight, the paint film may stick together.
Later whitish: The water-based dry drying time is 168 hours, which is difficult to achieve in production, but the drying speed of the water-based paint can be accelerated by increasing the temperature and air flow. If the moisture of the water-based paint is not completely volatilized, the moisture is In the later stage, it will migrate to the surface of the paint film, causing whitening.
b. How to prevent and treat water-based paint expansion ribs
Water-based paints contain water, which causes the wood fibers of the wood to absorb a large amount of water. The water causes the wood fibers to swell and the protrusions appear on the periphery of the wood eye. Water-based paint products have now broken through this problem, and the use of anti-swelling ribs to seal the primer can effectively prevent the wood from rising.
c. Prevention and treatment of water-based paint against tannic acid
Tannic acid in wood and glue will cause yellowing of the paint film. The special anti-tannic acid closed bottom can effectively seal the substrate, protect the surface of the paint film from yellowing, and use the anti-tannic acid special seal primer to effectively solve the white The yellowing problem of the paint.
d, color repair of water-based paint
Due to the large surface tension of the water-based paint, its auxiliary exhibitability is poor. It is easy to sag with a slight thick coating, and the surface is embossed. For some uneven and grooved workpieces, the color is accumulated and the edge is shrunk. Nowadays, the special water-based color correction main agent is used for color correction, and its color-repairing effect and construction performance are consistent with PU color-repairing, and it can also achieve the wet-on-wet process.
e, treatment of water-based paint wastewater
If the wastewater generated by the water-based paint spraying operation is not treated and discharged directly into the river or the soil, it is not environmentally friendly. Instead, the pollution of the atmosphere from the previous oil paint changed to the pollution of water resources. The ability of the atmosphere to repair pollution is much higher than the ability to repair water resources, so pollution of water resources is a more serious crime. The wastewater treatment of water-based paint is divided into two parts.
First, the collection of wastewater can dig two water-based paint wastewater treatment tanks. When the wastewater in the pool reaches a certain amount, a "demulsifier" may be added to precipitate the water-soluble resin dissolved in the water from the water; then the "flocculant" is added to make the demulsified material flocculate together; Technical means allow these flocs to float. As long as these floating flocs are picked up by tools, the water below is already clarified. After acid-base neutralization, it can be reused, and then professional filtration can be directly discharged. After the dried floc is dried, it can be used as a good solid fuel, with large heat energy, small smell and small smoke. At present, there are already many enterprises with mature technology and products, and some professional qualification companies can carry out such equipment processing, and the price is not cheap.
To achieve real oil reform, enterprises must step by step. The use of water-based paint is to completely change the original work habits of the operators, which will cause and cause many operators to cooperate and refuse. This requires enterprise management. The person in charge and the person in charge have a strong determination to promote and execute. Achieving true green waters is not just an empty talk, but requires upstream and downstream companies to work together to promote and work hard.
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