Due to the unique advantages of wood-plastic composites and pp-foamed sheets, their demand is growing rapidly, and many countries are setting up their own wood-plastic industry systems. The progress made in the research of PVC/wood-plastic composite extrusion foaming at home and abroad was summarized. The key technologies of wood powder processing, formulation, molding process and molding equipment were introduced to introduce PVC/Wood plastic foam composite materials. achievement. And on the current development situation, the development direction of PVC/Wood Plastic Foaming Materials was put forward.
Wood-plastic products have the dual characteristics of wood sheet and plastic: good mechanical properties, no fear of insects, no mold, no water absorption, long service life and reusability. However, the mechanical properties such as toughness, impact strength and flexural strength are still reduced relative to the base plastic. And as a substitute for wood, its density is too large, and the application field is limited. Microcellular foamed plastics have higher impact strength, toughness and fatigue life than unfoamed plastics, which compensates for the problem of insufficient performance of unfoamed wood plastic. At present, PVC, PP, PVC, PS and PUR-based wood-plastic foam composites have been produced. Among them, PVC-based wood-plastic foam composites have strong chemical stability, high strength, acid and alkali corrosion resistance, and water immersion resistance. , flame retardant and low cost, has been widely used.
Ten performances of wood plastic materials:
(1) Waterproof and moisture proof. It fundamentally solves the problem that wood products are prone to decay and swelling after being absorbed by moisture in humid and multi-water environments, and can be used in environments where traditional wood products cannot be applied.
(2) Insect and termite prevention, effectively eliminate insect harassment and prolong service life.
(3) Colorful, there are many colors to choose from. It has both natural wood and wood texture, and can be customized according to your own personality.
(4) It has strong plasticity, can realize individualized style very simply, and fully reflects individual style.
(5) High environmental protection, no pollution, no pollution, and can be recycled. The product contains no benzene, the formaldehyde content is 0.2, lower than the EO standard, and it is the European environmental protection standard. The recycling can greatly reduce the amount of wood used, and it is suitable for the national policy of sustainable development and benefit the society.
(6) High fire resistance. It can be effectively flame retardant, the fire level reaches B1 level, it will self-extinguish in case of fire, and it will not produce any toxic gas.
(7) Good processability, can be ordered, can be planed, can be sawed, can be drilled, and the surface can be painted.
(8) Simple installation, convenient construction, no complicated construction process, saving installation time and cost.
(9) No cracking, no expansion, no deformation, no maintenance and maintenance, easy to clean, saving post-maintenance and maintenance costs.
(10) The sound absorption effect is good, the energy saving is good, and the indoor energy saving is as high as 30% or more.