Fiber internally-reinforced wood plastic product with high impact resistance, high folding resistance and high size stability and preparation method thereof

Abstract

The invention discloses a fiber internally-reinforced wood plastic product with high impact resistance, high folding resistance and high size stability and a preparation method thereof. The product is formed through co-extrusion of a core layer and a surface layer; the core layer is composed of core layer polymer resin, fibers, plasticizer, a lubricating agent, antioxygen, core layer stabilizer and an interface modifying agent; the surface layer is composed of surface layer polymer resin, wood flour, surface layer stabilizer, calcium carbonate, a foaming agent, a foaming conditioning agent and plasticization stabilizer. The preparation method includes the steps that 1, surface layer raw materials are mixed to be uniform; 2, melt extrusion granulation is conducted, and surface layer particle materials are obtained; 3, the dried core layer resin is uniformly mixed with other core layer raw materials; 4, melt extrusion granulation is conducted, and core layer particle materials are obtained; 5, the surface layer particle materials and the core layer particle materials are subjected to co-extrusion, and the fiber internally-reinforced wood plastic product is obtained; or, the uniformly mixed surface layer particle materials and core layer particle materials are subjected to co-extrusion, and the fiber internally-reinforced wood plastic product is obtained. The wood plastic product has good impact resistance and bending resistance and is good in heated size stability.

Description

technical field [0001] The invention relates to a high-impact, high-bending, high-dimensional-stability fiber internally reinforced wood-plastic product and a preparation method thereof. Background technique [0002] In China, using wood as raw material to make houses or furniture has a very long history. The Hall of Supreme Harmony in the Forbidden City in Beijing was built during the Yongle period of the Ming Dynasty, the East Hall of Foguang Temple in Wutai Mountain, Shanxi was built in the middle of the Tang Dynasty, and the Fuyu Building in Yongding, Fujian Province was built during the Daoguang period of the Qing Dynasty. They are all very distinctive wooden buildings. The Eight Immortals table, incense table, Luban stool, etc. are wooden furniture with Chinese style. [0003] Wooden houses or furniture are often beautiful and elegant, with natural texture and fragrant smell, and have a feeling of harmony between man and nature; especially the structure in them is exq...

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Problems solved by technology

[0005] However, trees, especially rare trees, are limited natural resources, and their development and utilization are greatly restricted, and wood products themselves are easily rotted by moisture, breeding termites, etc., and are easy to consume. The times require that wood-plastic products emerge as the times require. Wood-plastic products are usually made by blending resin, wood powder, fillers and other additives. However, compared with solid wood, the mechanical properties of conventional wood-plastic products are Its strength and modulus are far from those of solid wood, so the use of current wood-plastic products as structural parts is often severely restricted, such as in furniture, outdoor plank roads and other structures, and there are serious safety hazards; in addition, due to conventional wood-plastic products The product contains a large amount of resin base material, so the heat resistance of the product is very poor, it is easy to warp and deform in a high temperature environment, and its dimensional stability has serious defects

In order to improve the mechanical properties of wood-plastic products, wollastonite, fibers, etc. are usually mixed and extruded with wood powder, plastics, etc. However, the interface of different materials does not form a compatible and continuous unity, which will make the product's The impact strength drops significantly, and the thermal dimensional stability of the product cannot be optimized and improved

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