Directional wood-plastic composite plate and manufacturing method thereof

Abstract

The invention relates to a directional wood-plastic composite plate and a manufacturing method thereof. The problem that large-slenderness-ratio wood raw materials are used for manufacturing wood-plastic composite materials is solved. The directional wood-plastic composite plate comprises the following ingredients in percent by weight: 70-95% of wood raw materials, 5-30% of thermoplastic plastics and 0.5-4% of coupling agents. The manufacturing method for the directional wood-plastic composite plate comprises the following steps of preparing raw materials; pre-treating the raw materials; adding the coupling agents in the raw materials; directionally laying the wood raw materials and thermoplastic plastic films in a layered manner; and performing hot pressing, cold pressing and later machining procedures on the materials. The directional wood-plastic composite plate has the advantages that the content of the plastics is low, the physical mechanical performance is high, the width of the directional wood-plastic composite plate is large, and release of harmful gas is avoided; and the directional wood-plastic composite plate is applicable to buildings, furniture and packaging materials.

Description

technical field [0001] The invention relates to a wood-plastic composite material and a preparation method thereof. In particular, it relates to a preparation technology of wood long-fiber oriented wood-plastic composite board. Background technique [0002] Wood-plastic composites are one of the fastest growing new polymer composites in the field of composites. Extrusion, injection and hot pressing are the three main methods of producing wood-plastic composites, but the extrusion and injection methods limit the size of their products, so hot pressing is the optimal method for producing large-format wood-plastic composites. [0003] The existing wood-plastic composite material production technology requires the size of woody raw materials to be small enough. The industry usually uses 40-100 mesh powdered wood fibers. The grinding of raw materials not only increases energy consumption, but also is the source of dust pollution and noise pollution. The use of large-sized raw m...

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Problems solved by technology

However, the mass fraction of woody raw materials in existing wood-plastic composite materials is generally 20% to 70%. When the woody raw material content is higher than 70%, the fluidity of the woody raw material and plastic mixture is poor, and the frictional resistance with the equipment pipe wall is relatively large. , causing defects such as poor product uniformity and surface cracking, so how to increase the content of woody raw materials in wood-plastic composites through new processes has become the focus and hotspot of research

[0005] In the process of producing wood-plastic composite materials by traditional hot pressing, the density of plastic particles is greater than that of wood raw materials, so that it is difficult to mix evenly the plastic with high density and the fiber with low density during the mixing process, even after paving and heating. During the pressing process, the dense plastic particles will slip and leak to the bottom layer of the slab, resulting in uneven distribution of plastic content and density in the thickness direction of the product

Although long-sized wood raw materials are beneficial to increase the performance of the final product, the above-mentioned slippage and uneven distribution caused by the use of granular plastics are more obvious. An effective solution is to use plastic films instead of plastic pellets

[0006] The invention describes a large-format oriented wood-plastic composite board and its hot-pressing preparation method, which uses large-scale wood fiber and thermoplastic film as the main raw materials, adopts layered oriented paving technology, and overcomes the small size of the wood raw material in the traditional method. The defects of low content and poor mechanical properties of products, uneven distribution of plastic and density have wide application potential in the field of construction, furniture and packaging materials

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