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Processing and Properties of WPC |
fengqingxue
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Posts: 4185
Location: newyork
Joined: 18.01.16 |
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Technical characteristics of WPC is to two categories large differences of different materials mixed together with each other. About to wood, plastic, composite material combined.
Wood flour (or crop fiber powder) as an organic filler having a wide variety of sources plastic, low cost, low density, good insulation, and many other inorganic fillers can not match the excellent performance, but it does not like to give as an inorganic filler widely used. The main reason is: First, the poor and the matrix resin compatibility: Second thermoplastics melt dispersed across the poor, resulting in poor flowability and extrusion processing difficulties. Since the main ingredient is cellulose, wood flour. Contains a lot of hydroxyl groups, these hydroxyl groups form intermolecular hydrogen bonds or intramolecular hydrogen bond with the water-absorbent wood flour. And very polar. The majority of non-polar thermoplastics, having water resistance, so compatibility between the poor adhesion interface is very small, need to surface additives modified plastics and wood flour. Increase the affinity of the interface between them. Modified flour with enhanced properties, can be a good stress transfer between the filler and plastic, so as to achieve the role of reinforced composite material strength.
Extrusion, thermoforming, injection molding is the processing of WPC main molding method. Since extrusion molding cycle is short, high efficiency and therefore the extrusion molding method is a more commonly used routing.
From WPC technology features point of view, mainly the following categories: the raw material to points, a type of plastic material used is pure commercial grade plastic or plastic: the other is the use of a single component of waste plastic has certain characteristics . Process according to points. One is the two-step molding method. That plastic and wood powder mixed molding directly.
From the formation mechanism of view, one is physical shape. That the use of thermal barrier adhesive. Molding plastic and wood flour in the process will be bonded together; the other is physical chemistry molding. That is, by the addition of additives. Under controlled pressure and temperature. The raw material mixture with a relatively low molecular weight polymer additives together for the transition state of the mesh fiber material. This process uses materials made. Internal structure is completely fusion rebirth network molecular structure than other technology to produce wood products, flexural, compressive strength, impact strength is better.
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