Why is plastic wood composite more moisture-proof, mildew-proof and anti-corrosion than preservative wood

Why is plastic wood composite more moisture-proof, mildew-proof and anti-corrosion than preservative wood?

Anticorrosive wood is the use of ordinary wood after soaking in a chemical preservative solution or high-pressure penetration to make it have the characteristics of anti-corrosion, moisture-proof, anti-fungal, insect-proof, anti-mildew and waterproof. Common preservative wood materials are Russian pine, Nordic pine or ordinary pine, and fir. In addition, there is also a kind of carbonized anticorrosive wood, in which the effective nutrients of the wood are carbonized at a high temperature to achieve the purpose of anticorrosion by blocking the nutrient chain for the survival of decaying bacteria.

Plastic wood composite, also known as wood plastic composite, refers to a composite material that uses polypropylene, polyethylene, polyvinyl chloride and other plastics instead of usual adhesives, and is mixed and extruded with more than 35%-70% natural plant fiber powder.
So, why is it said that plastic wood composite is more antiseptic, mildew and moisture proof than anticorrosive wood?

First, the density of plastic wood composite materials is 1.2-1.3g/cm³, while the density of conventional wood used for preservative wood is only 0.4-0.5g/cm³; the loose fiber structure of preservative wood makes it easy to absorb moisture in the natural environment , long-term moisture content will cause mold to grow in a short time, and produce swelling, cracking, moldy and blackening; and the plastic wood composite material has a compact structure, and the density is about three times that of conventional anticorrosive wood, almost completely without absorbing the moisture in the natural environment, without the nourishment of moisture, there is no living environment for mold.

Second, plastic wood composite materials are made by fusion and extrusion of thermoplastics and natural wood fibers at high temperatures. The materials contain no moisture or nutrients. Natural bacteria are also wiped out during high-temperature processing, which is completely unsuitable for bacterial growth. ; plastic wood composite material has dense intermolecular structure and hard surface, which is not suitable for insects and ants. The anti-corrosion wood is just the opposite. Its loose structure and easy absorption of water make it a high-nutrient breeding base for bacteria, and the softness of the fiber also makes it more vulnerable to insects, ants, and rodents.

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