Preparation of electro-magnetic shielding wood plastic board

An electromagnetic shielding and plate technology, applied in the fields of magnetic field/electric field shielding, electrical components, sustainable waste treatment, etc., can solve the problems of surface damage, complex preparation process, low reflection electromagnetic waves, etc., and achieve low cost, simple process and low density. Effect

Inactive Publication Date: 2009-02-11
中山市森朗环保装饰建材有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, ordinary electromagnetic shielding materials generally use metal materials as conductors directly. Since wood materials are basically insulating materials, they can be combined with metal to have electromagnetic shielding performance. The method can be: form a metal nickel layer on the surface of wood chips, and then apply glue, Forming and pressing the particleboard with electromagnetic shielding effect, the shielding effect is >30dB in the frequency range of 30-500MHz, but the manufacturing process is more complicated, and the bonding between metal and natural fiber is also difficult
Chinese patent 02124139.2 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 in the It is heated at a higher temperature and molded 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.
Chinese patent 03141800.7 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, the sintered material is coated with an organic resin and cured at room temperature. The electromagnetic shielding composite material has light weight, high absorption and low reflection of electromagnetic waves. The defects of this patent are: 1) the equipment manufacturing of this patent It is relatively difficult, and the cost is high, and it is difficult to complete industrial production (for example, under a non-oxygen inert atmosphere, and carry out high-temperature treatment in the temperature range of 250-1500 ° C, the heating rate is 1-20 ° C / min, and the holding time is 1-20 ° C. 6 hours); 2) the invention is to spray a thin resin on the surface of the plate, which is easy to damage the surface layer in use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Prepare 50 kg of straw powder and graphite powder according to the mass ratio of 1:1, add 250 g of ferrocene particles, mix in a mixer, stir at high speed and raise the temperature to 110°C, add titanate coupling agent 400 gram, mixed with 100 kilograms of PVC resin powder for 15 minutes, unloaded to the cold mixer and mixed to normal temperature, and then granulated. After granulation, the sheet is extruded on a large-scale sheet extrusion equipment with good blending and dispersion. The aspect ratio of the sheet extrusion equipment is greater than 20, and the screw diameter is greater than 100mm. Then, it is cut and packaged. The thickness of the prepared sheet is controlled at 4-5mm The content of graphite powder per square meter of wood-plastic board is more than 500 grams. According to GB12190-90II, the wood-plastic board is tested, and its shielding effectiveness reaches 30dB in the frequency range of 300MHz to 1000MHz. This kind of wood-plastic board can be used...

Embodiment 2

[0029] Prepare 50 kg of wood chips and graphite powder in a mass ratio of 1:1, add 200 g of ferric hydroxide particles, mix in a mixer, stir at high speed and heat up to 100 °C, add 250 g of silane coupling agent , mixed with 100 kg of PE resin for 10 minutes, unloaded to a cold mixer and mixed to room temperature, and then granulated. After granulation, the sheet is extruded on a large-scale sheet extrusion equipment with good blending and dispersion. The aspect ratio of the sheet extrusion equipment is greater than 20, and the screw diameter is greater than 100mm. Then, it is cut and packaged. The thickness of the prepared sheet is controlled at 4-5mm The content of graphite powder per square meter of wood-plastic board is more than 500 grams. Measure its shielding coefficient, according to GB12190-90II to test the wood-plastic board, it is measured that in the frequency range of 300MHz ~ 1000MHz, the shielding effectiveness reaches 30dB. This kind of wood-plastic board can...

Embodiment 3

[0031]Prepare 40 kg of straw powder and graphite powder according to the mass ratio of 1:1, and add 200 g of hydrated nickel hydroxide particles, mix in a mixer, stir at high speed and heat up to 120 ° C, add maleic anhydride coupling agent 500 grams, mixed with 100 kilograms of ethylene-propylene resin for 20 minutes, unloaded to the cold mixer and mixed to normal temperature, and then granulated. After granulation, the board is extruded on the extruder. The length-to-diameter ratio of the board extrusion equipment is greater than 20, and the screw diameter is greater than 100mm. Then, it is cut and packaged. The thickness of the prepared board is controlled at 4-5mm. Graphite in each square meter of wood-plastic board The powder content is more than 500 grams. Measure its shielding coefficient, according to GB 12190-90II to test the wood-plastic board, it is measured that its shielding effectiveness reaches 30dB in the frequency range of 300MHz ~ 1000MHz. This kind of wood-...

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Abstract

The invention relates to a method for preparing an electromagnetic shielding wooden plate. The method comprises the following steps: (1) preparing a base material according to the mass ratio of 1:1-1:2 of a wood powder and a graphite powder, mixing in a mixer, adding magnetic particles accounting for 0.5%-1% of the mass of the graphite powder, agitating and heating to 100-120 DEG C; (2) adding a finishing agent accounting for 0.5%-1.4% of the amount of the base material, and a resin which is 1.67-2.5 times of the amount of the base material in the mixer, mixing for 8-15 minutes, discharging the material and feeding the material to a cool mixer, mixing to the normal temperature, and granulating; and (3) cutting, packaging and measuring the shielding factors after the granulated materials enter a plate extrusion device for formation. The invention has the advantages of low cost, wide resource, low density, high electromagnetic shielding capacity in an ultra wideband range, and higher electromagnetic wave absorption capacity.

Description

technical field [0001] The invention relates to an electromagnetic shielding composite material, in particular to a preparation method of an electromagnetic shielding wood-plastic plate. Background technique [0002] The so-called electromagnetic shielding is to use the closed surface of the conductive or magnetic conductor to electromagnetically isolate the space on both sides of the inside and outside. Therefore, the electromagnetic energy transmitted from the space on one side to the space on the other side is suppressed to the extreme due to the fulfillment of the shielding. In a small amount, this suppression effect is called shielding effectiveness or shielding insertion attenuation, expressed in decibels (dB). [0003] At present, ordinary electromagnetic shielding materials generally use metal materials as conductors directly. Since wood materials are basically insulating materials, they can be combined with metal to have electromagnetic shielding performance. The me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00C04B26/02C04B18/26C04B22/06
CPCY02W30/91
Inventor 刘雪宁陈元文梁伟东梁立仁黎新强秦特夫
Owner 中山市森朗环保装饰建材有限公司
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