Polyolefin wood-plastic composite material and preparation method thereof

Abstract

The invention discloses a polyolefin wood-plastic composite material. The polyolefin wood-plastic composite material is prepared by blending and extruding the following components in parts by weight: 20 to 80 parts of polyolefin resin, 20 to 80 parts of plant fiber powder, 2 to 8 parts of compatilizer, 1 to 8 parts of lubricant, and 0.1 to 1 part of antioxygen, wherein the lubricant includes pentaerythritol tetra-benzoate. The composite material has the balance torque of 3.2 to 8.4N.M, bending strength of 30.1 to 66.3MPa, and bending modulus of (0.80-22.6)*10<4>MPa. The invention also discloses a preparation method of the polyolefin wood-plastic composite material. The ester bond of the pentaerythritol tetra-benzoate contained in the wood-plastic composite material and the hydroxyl of the plant fibers can produce high hydrogen bond effect, so that the plant fibers can be promoted to be uniformly dispersed, the filling amount can be increased, the product cost is reduced, the defect on the appearance of the product is avoided, the melting and extruding efficiency is improved, and the bending performance and water absorbing performance of the material are improved; and the polyolefin wood-plastic composite material can be used as the high-level polyolefin wood-plastic composite material to be widely applied in the fields such as indoor and outdoor decoration and construction industry.

Description

technical field [0001] The invention belongs to the technical field of wood-plastic composite material and its preparation, and in particular relates to a polyolefin wood-plastic composite material and a preparation method thereof. Background technique [0002] As we all know, with the rapid development of the economy and the improvement of people's living standards, the demand for wood is increasing, and the growth cycle of trees is very long, making the available wood less and less, so looking for wood substitutes becomes very urgent. [0003] Because the wood-plastic composite material is a kind of resource-recycling green and environmentally friendly new material made by mixing wood powder and thermoplastics at high temperature through extrusion, molding, etc., it has the properties of wood that can be sawed, planed, nailed, etc. Excellent processing performance is a good substitute for wood, so it is not only widely used in the construction industry, furniture, automob...

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Problems solved by technology

[0007] However, people have found that the zinc stearate-EBS lubrication system conflicts with the system using the maleic anhydride grafted polyolefin compatibilizer during use, which not only greatly reduces the coupling effect, but also reduces the polyolefin wood-plastic lubrication system. Mechanical properties of composite materials, such as flexural strength, flexural modulus, etc.

For this reason, U.S. Patent No.7,731,880 discloses using EBS alone as a lubricant for wood-plastic composites or as a compound lubricant for wood-plastic composites with EBS and pumice and talcum powder, although the obtained polyolefin wood-plastic composite The performance of the material is better than that of zinc stearate-EBS lubrication system, which improves the bending performance and water absorption performance, but its bending strength is only increased by 10%, and the water absorption performance is only improved by a few percent, and the improvement effect is extremely limited

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