A kind of electromagnetic shielding wood-plastic composite material and preparation method thereof

Abstract

The invention discloses an electromagnetic shielding wood-plastic composite material. The electromagnetic shielding wood-plastic composite material is composed by mass ratio: 30-50 parts of PVC resin powder, 15-30 parts of agricultural and forestry residue powder, and 10-30 parts of graphene shielding powder. 20 parts, 2-6 parts of environmental protection stabilizer, 1-3 parts of processing aid, 1-3 parts of lubricant, 1-5 parts of toughening agent, and 0.5-3% of coupling agent. The preparation method includes the following steps: S100 , prefabricated agricultural and forestry three residual powder and electromagnetic guiding agent; S200, mixed and modified agricultural and forestry three residual powder and coupling agent; S300, modified agricultural and forestry three residual powder and PVC resin powder, graphene powder, electromagnetic guiding agent and environmental protection Stabilizers, processing aids, lubricants, and toughening agents are mixed and cooled at high speed to obtain mixed powder; S400, mixed powder is centrifuged and then added to the extruder, and is carried out through the process of calendering, traction and cutting, and electromagnetic guiding agent. The electromagnetic wood-plastic material is internally conductive and isolated, so as to obtain a wood-plastic composite material with good shielding effect.

Description

technical field [0001] The invention relates to the field of wood-plastic composite materials, in particular to an electromagnetic shielding wood-plastic composite material and a preparation method thereof. Background technique [0002] With the development of electronic information technology and the wide application of various electronic and electrical equipment, people's living space is filled with various electromagnetic waves. While it brings convenience to people's life, the harm caused by electromagnetic interference is gradually Being valued by people, it not only affects the normal work of various electronic and electrical equipment, but also brings harm to human health. At present, ordinary electromagnetic shielding materials generally use metal materials as conductors directly. Since wood materials are basically insulating materials, only when they are combined with metal can they have electromagnetic shielding effectiveness. [0003] Chinese patent CN02124139.2 ...

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Problems solved by technology

[0003] Chinese patent CN02124139.2 discloses a "preparation method of graphite-based composite material for electromagnetic shielding", which is characterized in that expandable graphite and additives that can produce magnetic particles are mixed uniformly by mechanical physics or solution dissolution, and then Then heat it at a higher temperature and mold it into a product of the desired shape. The conductivity of the product is better than that of ordinary conductive polymer materials, and the electromagnetic shielding performance has been significantly improved, but its preparation process is complicated and the cost is relatively high.

[0004] Chinese patent CN03141800.7 discloses a "preparation method of electromagnetic shielding composite material", which uses wood material as raw material, and immerses wood material in an aqueous solution of magnetic metal salt, forming treatment and non-oxidative high-temperature firing treatment , and further coat the fired material with organic resin, and make it after curing at room temperature. The electromagnetic shielding composite material has light weight, high absorption and low reflection electromagnetic wave ability, but the equipment of this patent is difficult to manufacture and the cost is high , it is difficult to complete industrial production; spraying a thin layer of resin on the surface of the board will easily damage the surface and cause failure during use

[0005] Chinese patent CN201610533519.5 discloses a "wood-plastic electromagnetic shielding board and processing method", which adopts a relatively high proportion of carbon black and is processed by a flat vulcanizing machine. The processing technology is complicated and a large amount of carbon black is added. High cost, poor dispersion, limited shielding effectiveness

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