PVC/plastic wood composite material is one of the earlier industrialized wood-plastic composite materials, and its usage is increasing rapidly. Compared with other polyolefin plastic woods, PVC/plastic wood composites
have good rigidity and low price, and its emergence has brought a revolution to the wood products industry. Especially in today’s tight resources, it has brought new vitality to the wood-plastic industry. Next, we will introduce the advantages and disadvantages of PVC plastic wood composite materials.
The advantages of PVC/plastic wood composites include:
(1) Water resistance:
The water absorption of the wood itself is as high as 8%-10%, but after the surface treatment of the plastic wood
, a polymer film is formed on the surface, and the plastic wood is also tightly coated with the polymer material, and the test results indicate that the material is The water absorption rate is 2%, and it has certain waterproof performance.
(2) Excellent flame retardant performance:
This is related to the molecular structure of polyvinyl chloride in the material. Because of the molecular structure of PVC, the content of chlorine is as high as 56%, and the chlorine itself has the function of self-extinguishing from the fire.
(3) Good anti-mildew performance:
The plastic wood is surface-treated and coated with polymer materials, and the mould lacks the environment for breeding; in the process of plastic wood, the surface is adsorbed with an anti-mould agent, which also improves the anti-mildew property of the product.
(4) Strong woody feeling:
The plastic wood
content of PVC/plastic wood composite material can reach 30%-50%. At the same time, through micro-foaming, the product density can be controlled between 0.61.0g/cm, which is very close to the density of wood, internal organization. It is relatively loose and has a natural woody feel. Can be equipped with a variety of colours to avoid chromatic aberrations.
(5) Corrosion resistance:
The wood itself has poor corrosion resistance but is coated with a polymer material, and the polyvinyl chloride itself has good acid-base inertness.
PVC plastic wood materials can produce products of different grades, different specifications and different colours according to different wood species and colours. Since the production process uses extrusion moulding, automatic continuous production can be realized, and the length can be arbitrarily determined, which is impossible for logs.
The shortcomings of PVC/plastic composites include:
Of course, PVC/plastic wood composites also have some shortcomings. For example, the use of wood fibre as a filler will reduce the ductility and impact strength of the material, and its brittleness is greater than that of pure plastic.
The density of wood/plastic composites is usually more than twice the density of solid wood materials, which limits its application to some extent. Foaming is generally used to improve its deficiencies. For wood/plastic composites, it is usually possible to use both physical foaming and chemical foaming. The former uses a low-boiling substance as a foaming agent and is heated to volatilize. The generated gas is foamed; the latter is foamed by a gas generated by decomposition or reaction upon heating of the chemical.
In addition, in order to ensure a certain rigidity and strength of the material, the degree of foaming is generally preferably low foaming (i.e., the material density after foaming is greater than 0.4 g/cm3). One of the effective ways to obtain the high-performance mass ratio of materials is microcellular foaming of wood fibre composites. The cell density of microcellular foaming materials is 109~1015/cm3, and the cell diameter is 0.1~10.0Lm. Its cell size is much smaller than that of traditional foam materials. These small bubbles can effectively prevent the crack propagation in the material and make the crack tip dull. Therefore, the impact strength, toughness, fatigue cycle, thermal stability and other aspects are significant. Increased, and the presence of cells reduces the density of the material.
Therefore, the microcellular foaming of the wood fibre composite material can overcome the defects in physical and mechanical properties and the like, and the performance of the material is greatly improved.
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