WPC is a forest products processing wastes and crop stalks and other biomass-based primary raw material, the use of polymer interface chemistry and characteristics of modified plastics filled with a certain proportion of mixed plastic base material, after special treatment forming a reversible process recycling, form the basic structure of various materials. Different at home and abroad this title, also call it: wood, green wood, wood technology, renewable wood, synthetic wood or Poly wood, the standard English name: Wood & Biofiber Plastic Composites, known as the WPC industry . Domestic R & D out of the wood are materials / products include structural, decorative, package and special type of class several types, including wire, sheet, plate, sections and profiles and many other series, its scope is almost cover all wood, plastic, steel, aluminum and other composite materials similar to the current field of use, has entered the building, home improvement, furniture, logistics, packaging, garden, municipal, environmental, military, sports and other industries, the market potential is very deep.
Generally speaking, the wood-plastic composite materials have five characteristics:
1, the raw material resources, and its raw materials to achieve the comprehensive utilization of resources and effective use.
2, the product can be plastics, can produce different performance requirements and the shape of the products.
3, the use of environmental protection, wood / plastic substrate, commonly used additives and finished products are safe and environmentally friendly.
4, cost-based, low-value materials to achieve a high value-added products to the transfer.
5, recycling, and its end of life and recycling waste products can be 100% recycling.
Definition
WPC (Wood-Plastic Composites, WPC) is booming at home and abroad in recent years, a new class of composite materials, refers to the use of polyethylene, polypropylene and polyvinyl chloride, etc., instead of the usual resin adhesive, with more than 50% wood flour, rice husk, straw and other plant waste wood fibers mixed into new materials, and then by extrusion, molding, injection molding and other plastics processing, production of sheet or profile. Mainly used for building materials, furniture, logistics, packaging and other industries. Plastic and wood powder mixed in proportion by hot extrusion of the plate, called the wood-plastic composite sheet extrusion.
Features
Wood-based composite materials for high-density polyethylene and wood fiber, determine its own with some of the features of plastic and wood.
1) Good processability
Wood-plastic composite materials containing plastics and fibers, therefore, has a similar processing of wood with the performance, can be cut, nailed, planed, the use of woodworking equipment to complete, and the nail-holding power is superior to other synthetic materials. Mechanical properties superior to wood. Nail-holding ability is generally three times the timber is five times the particle board.
2) good strength properties
Wood-plastic composite materials containing plastic, which has good elastic modulus. In addition, fiber, and contains well-mixed with the plastic, which has the hardwood considerable compression, bending and other mechanical properties, and its durability is better than ordinary wood. High surface hardness, the wood is generally 2 - 5 times.
3) has a water resistance, corrosion resistance, long life
Wood and wood materials and products compared to strong acid-resistant, water-resistant, corrosion-resistant, and not the growth of bacteria, can not easily be destroyed by insects, fungi, not long. Long life, up to 50 years.
4) Excellent performance adjustable
By additives, polymerization can occur plastic, foam, curing, modified and other changes, thus changing the density of wood material, strength and other characteristics, but also to anti-aging, anti-static, flame retardant and other special requirements.
5) with UV light stability, good color.
6) The biggest advantage is turning waste into treasure, and 100% recovery of reproduction. Can be broken down, without causing "white pollution", is truly green products.
7) The wide range of sources of raw materials
Wood-plastic composite material of plastic raw materials are mainly high-density polyethylene or polypropylene, wood fiber can be wood flour, bran, or wood fiber, also need a small amount of additives and processing aids.
8) as needed, made into any shape and size.
With the development of wood-plastic composites, wood-plastic composite materials, plastic raw materials, in addition to high-density polyethylene or polypropylene, there are PVC and PS. Process is also the first single screw extruder into the second generation of conical twin-screw extruder, to the parallel twin-screw extruder by the initial granulation, formed by the conical screw extruder, can be difficult to make plastics, poor aging resistance, poor creep resistance, color consistency and durability of poor and low tensile strength characteristics.
Scope
Use of wood-plastic composites is one of the most important alternative to solid wood in various fields of application, which is the most widely used in building products, wood-plastic composite products accounted for 75% of the total. WPC main use of premises and use Table 1.3-1.
Table 1.3-1 mainly use wood-plastic composite materials, place and purpose
Field of the main purposes Class Specification
Outdoor lawn outdoor board corridor, pool edging, according to user requirements to provide open-air corridor
Flower box flower box board, tree pools, fences, trash according to user request
Decorative panels decorative wall panels, sun visors, blinds of the request by the user
Bench bar stool, bar chair, back bar, leisure Desktop by users for
Signs signs, signs, billboards and in accordance with user request
Structural timber columns, beams, keel (which can inlay metal) square, round, shaped both
Hydrophilic decking dock decking, water channel, near water construction w 10-15cm h 2-3cm
Type (board) wood plank road, trail, bridge plate (solid or hollow) w 10-15cm h 2-3cm
Type (pole) material handrails, guardrails, fences, partitions, lining files by user request
Flower corridor - complete construction in accordance with user requirements
Outdoor pavilion - complete construction in accordance with user requirements
Open platform - complete construction in accordance with user requirements
Easy parking room - complete construction in accordance with user requirements
Indoor flooring - h 1.2-1.8cm
Top plate - required by the user
Wall skirt - according to user request
Bathroom board - according to user request
Door frames set - according to user request
Interior partitions - according to user request
Insulation board (wall) - requested by users
Various types of moldings moldings, trim, inlaid articles, decorative articles according to user request
(WPC) is the use of plant fiber or wood fiber filled, enhanced by the hot composite, different processing methods such as melt extrusion made of modified thermoplastics. In recent years, with global resources are depleting and social awareness of environmental protection has become increasingly high, the application of wood and petrochemical products and a higher requirement. In this context, the wood plastic composite material that can not only play the advantages of each component, to overcome the low strength of wood, large variability and low modulus of elasticity of organic materials caused by the use of limitations, but also take advantage of wood and plastic waste, reduce environmental pollution. Currently, value-added products improve the materials become more and more widespread concern. Research focus is now mainly concentrated in the polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS) and other thermoplastic and wood flour, straw powder plant, plant species of shell and other wood powder as raw material, extrusion, injection molding, pressure molding of composite materials made of. From the perspective of raw materials, wood plastic composite material can be a variety of waste plastics, waste wood and crop residues. Therefore, the development of wood-plastic composite materials and widely used, help to reduce the pollution of plastic waste, agricultural waste burning also helps reduce the pollution to the environment. Wood-plastic composite materials production and use, will not be distributed to the surrounding environment of volatile hazardous to human health, the material itself can be recycled, is a new green products, but also an ecologically clean composite.
What is wood: refers to the use of polyethylene, polypropylene and polyvinyl chloride, etc., instead of the usual resin adhesive, with more than 35% -70% of wood flour, rice husk, straw and other plant fibers mixed waste wood materials into new , then by extrusion, molding, plastic injection molding and other processing technology to produce plates or profiles. Mainly used for building materials, furniture, logistics, packaging and other industries. Plastic and wood powder mixed in proportion by hot extrusion of the plate, called the wood-plastic composite sheet extrusion.
Wood-plastic composite materials containing plastic, which has good elastic modulus. In addition, fiber, and contains well-mixed with the plastic, which has the hardwood considerable compression, bending and other mechanical properties, and its durability is better than ordinary wood. High surface hardness, the wood is generally 2 to 5 times.
Wood's performance:
1 products have the same processing performance with the logs, can be nailed, drilled, cut, adhesive, nails or bolts to connect with the fixed surface is smooth without sanding and paint, the paint adhesion is good, also based on personal preference painting.
2 Products Ka better than wood physical properties, good dimensional stability than wood, noise will have cracks, warping, no wood knots, twill, add coloring agents, film or composite surface can be made of colorful a variety of products, so no regular maintenance.
3 can be a variety of specifications, size, shape, thickness and other needs, which also includes a variety of designs, colors and wood grain products, give customers more choices.
4 products are fireproof, waterproof, corrosion engage, resistant to moisture, will not be moth-eaten, not long fungi, acid, non-toxic, pollution and other excellent performance, low maintenance costs.
5 has a similar wood product appearance, high hardness than the plastic, long life, can be thermoformed, high strength, energy conservation.
6 products are hard, lightweight, warm, smooth surface, free of formaldehyde and other harmful substances, no poison, no pollution.
Wood Application:
Wood interior doors, flooring, baseboard, the whole cabinet, wardrobe, siding, decorative hanging plates, hanging siding, outdoor flooring, wood fence, steel gazebo, garden fence, balcony fence, leisure benches, flower , air conditioning, racks, blinds, and so on and so on. Application of flexible wood materials, wood processing can be applied to any field, is the best eco-friendly materials to replace wood.
Wood advantages:
(1) waterproof, moisture-proof. The fundamental solution of the wood products for wet and damp than water in the water after the decay, expansion and deformation problems, you can use traditional wood products can not be applied to the environment.
(2) pest control, termite, insects effectively put an end to harassment and prolong life. Wood Products
(3) colorful, many colors to choose from. Both natural wood and wood grain texture, and can be customized according to their individual needs color
(4) plasticity, can be very simple to achieve personal style, fully embodies personality style.
(5) high environmental protection, pollution, pollution-free, recyclable. Product does NOT contain the material, the formaldehyde content of 0.2, lower than the EO-class standards, environmental standards for the European classification, significant savings can be recycled use of wood for sustainable development policy for the benefit of society.
(6) high fire resistance. Effective flame retardant, fire rating to B1 level, fire extinguishing, does not produce any toxic gases.
(7) can be processed, and can be set, planed to be sawn, drilled, the surface can be painted.
(8) Installation is simple, convenient construction, no complicated construction process, saving installation time and costs.
(9) does not crack, no swelling, no distortion, no repair and maintenance, easy to clean, repair and maintenance cost savings later.
(10) sound-absorbing effect, energy efficiency, good indoor saving up to 30% or more.
