WPC waterproof mildew and other characteristics, the performance for the same product is good, but in order to become the industry leader that's not enough, you need to go to the various properties of WPC to increase most for how to waterproof mildew improve its performance, the following describes some ways.
Precautions Because WPC wood-plastic composite materials are used almost exclusively outdoor environment (climate change challenge requires long-term experience sun, rain and frozen), so the researchers conducted the product development process, always consider the product to adapt to the harshest weather conditions, especially in the life of the product, the product does not appear to ensure that climate change caused by quality problems. WPC product is a material of a hygroscopic, sawdust, and hydrophobic materials, plastics, and various types of pigments and additives are mixed together material from the complex. In the WPC industry standard. Wood is the addition ratio of the filler is usually 40 to 60%. Such products can increase stiffness and creep resistance. Wood filler price of approximately $ 0.10 / lb, but from the overall production considerations, WPC comparison to all plastic products to reduce production costs. Type of wood, hardwood or cork, can ultimately affect the weatherability of WPC products, each polymer degradation has its own characteristics. WPC 75% is made of polyethylene (PE). A small but is the future trend of manufacturers use polypropylene (PP) and polyvinyl chloride (PVC) instead of the original polyethylene raw materials, such products are more durable and more difficult to process. But there are also disadvantages, polypropylene, polyethylene and polyvinyl chloride easier than the surface being oxidized.
WPC studies Species
Morrell said "WPC product moisture performance is very good, especially compared to wood. But over time, the moisture resistance will be discounted." She currently ongoing commercial laboratory water cycle WPC boards, wet / dry, cycle. The boards were manufactured by Strandex company. The boards were composed of 60% wood chips, 40% of high-density polyethylene (HDPE) composition. The results showed that, after each cycle of water, the water content of the sheet will have a certain degree of increase. After four cycles after its water content has reached 2.6%. The results showed that, after experiencing water cycle test, void volume between wood and plastic increased.
"Constitutes WPC products is very complex " Atlas Material Testing Technology LLC senior adviser AllenZeilnik said, "and bio-polymer fiber has its own separate mechanisms of degradation," "due to degradation in the composite polymer surface, the fiber is located at both ends, so the moisture can be absorbed deep into the interior through the surface of the material. "he explains. Like a leaky faucet this problem continues to worsen over time. Since the fibers absorb moisture and sustained expansion, leaving voids after drying. This will lead to more complex materials inside the product to absorb moisture, so a vicious cycle. These voids, while providing a very useful environment for the growth of microorganisms, fungi and molds. "I even saw the WPC product grow mushrooms." Zelinik said.
AEWC Advanced Composite Structures Center University of Maine, a professor of wood science and technology research Douglas Gardner believes, WPC products mildew situation is not only determined by the production principle, but also, and location, that is related to the work environment. For example, WPC panel products in Florida a few years after installation, the surface of the red fungi. This means that the wood is still susceptible to biological degradation. Other tropical, humid environments also reported a similar situation, such as Hawaii.
Since the passage of moisture is absorbed into the wood fibers inside the composite material, the simplest way is to reduce the amount of wood filler. Gardner said that many commercial plate production by adding 60% to 65% of the wood filler. "Sometimes even too much wood raw material producers added." He said.
Another product to prevent mildew WPC ways to use other types of wood in the production process. Morrell said the test showed that there is a fungus, white-rot fungus, more like wood. The hardwood is WPC products are a major source of wood flour. Workaround You can use western red cedar wood as a substitute. Because Western red cedar is a cork, cut with a high degree of corrosion resistance. Some researchers say, adding biocides into WPC products, such as zinc borate. Although boric acid can be very good control of fungal growth, but not an effective mildew.
For waterproof mildew treatment WPC we have to do a lot, just above describes a study of a researcher and his team, I believe in the near future there will be more outstanding performance of WPC market
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