阅读说明：本技术 一种高弹性导电橡胶屏蔽复合材料及其制备方法 (High-elasticity conductive rubber shielding composite material and preparation method thereof ) 是由 张世祥 于 2020-05-13 设计创作，主要内容包括：本发明属于功能材料制备技术领域,具体公开了一种高弹性导电橡胶屏蔽复合材料及其制备方法,包括天然橡胶60-150份、短切碳纤维6-15份、活性剂3-10份、补强填充剂30-90份、表面改性导电填料8-25份、导电增塑剂5-15份、配合剂2-4份；本发明以具有极性的天然橡胶为主体材料,通过添加经过表面改性处理的导电填料,合理调整各组分用量,制得具有良好的导电性能的导电橡胶,该导电橡胶具有较低的体积电阻率,优异的弹性、回弹性和拉伸强度,且制造成本较低,结合短切碳纤维良好的物理机械性能,制造电磁屏蔽的复合材料,使其既具有短切碳纤维优良的电磁波吸收性能,又具有橡胶材料优良的物理机械性能,可以适应多种环境的需要,电磁屏蔽性能高。(The invention belongs to the technical field of functional material preparation, and particularly discloses a high-elasticity conductive rubber shielding composite material and a preparation method thereof, wherein the high-elasticity conductive rubber shielding composite material comprises 60-150 parts of natural rubber, 6-15 parts of chopped carbon fibers, 3-10 parts of an active agent, 30-90 parts of a reinforcing filler, 8-25 parts of a surface modified conductive filler, 5-15 parts of a conductive plasticizer and 2-4 parts of a compounding agent; the invention takes natural rubber with polarity as a main material, adds the conductive filler subjected to surface modification treatment, reasonably adjusts the dosage of each component, and prepares the conductive rubber with good conductive performance, the conductive rubber has lower volume resistivity, excellent elasticity, rebound resilience and tensile strength, and lower manufacturing cost, and combines the good physical and mechanical properties of the chopped carbon fiber to prepare the electromagnetic shielding composite material, so that the electromagnetic shielding composite material not only has the good electromagnetic wave absorption performance of the chopped carbon fiber, but also has the good physical and mechanical properties of the rubber material, can meet the requirements of various environments, and has high electromagnetic shielding performance.)

1. A high-elasticity conductive rubber shielding composite material is characterized in that: the composite material is prepared from the following raw materials in parts by weight: the composite material comprises 60-150 parts of natural rubber, 6-15 parts of chopped carbon fibers, 3-10 parts of an active agent, 30-90 parts of a reinforcing filler, 8-25 parts of a surface modified conductive filler, 5-15 parts of a conductive plasticizer and 2-4 parts of a compounding agent.

2. A highly elastic conductive rubber shielding composite as claimed in claim 1, wherein: the compounding agent is any one of stearic acid, zinc oxide, an anti-aging agent, carbon black, paraffin oil, an accelerator and a vulcanizing agent.

3. A highly elastic conductive rubber shielding composite as claimed in claim 1, wherein: the thickness of the natural rubber is 2-8 mm.

4. A highly elastic conductive rubber shielding composite as claimed in claim 1, wherein: the active agent is any one of zinc oxide, stearic acid, polyethylene glycol and stearate.

5. A highly elastic conductive rubber shielding composite as claimed in claim 1, wherein: the surface modified conductive filler is any one of surface modified carbon fiber and surface modified carbon nano tube.

6. A highly elastic conductive rubber shielding composite as claimed in claim 5, wherein: the carbon fibers and the carbon nanotubes are subjected to surface treatment by adopting a surfactant, wherein the surfactant comprises any one of an ether surfactant, a fatty acid soap surfactant, an amine ether surfactant and a silane coupling agent.

7. A highly elastic conductive rubber shielding composite as claimed in claim 1, wherein: the conductive plasticizer is an ester plasticizer.

8. The high elasticity conductive rubber shielding composite of claim 7, wherein: the ester plasticizer is any one of dioctyl phthalate, dioctyl terephthalate, trioctyl trimellitate, dioctyl sebacate, dioctyl adipate, diester oxalate and diisononyl phthalate.

9. The method for preparing a high-elasticity conductive rubber shielding composite material according to any one of claims 1 to 8, wherein the method comprises the following steps: the method comprises the following steps:

s1, fully dispersing the chopped carbon fibers in a beater, carrying out suction filtration on the dispersion liquid, and fully drying to obtain chopped and dispersed carbon fiber monofilaments, wherein the diameter of the fibers is 4-9 mu m, and the length of the fibers is 1.5-2 mm;

s2, preparing natural rubber and chopped carbon fiber according to the normal-temperature weight part ratio of 100: 1-10, and preparing other accessory ingredients according to a conventional method;

s3, in an internal mixer or an open mill, firstly plasticating the natural rubber prepared according to the parts by weight for 3min, then sequentially adding an active agent, 1/2 parts of reinforcing filler and surface modified conductive filler, after banburying for 3min, adding the rest reinforcing filler and conductive plasticizer, banburying to 145 ℃ for rubber discharge, then adding chopped carbon fiber and other compounding agents for mixing, tabletting after mixing uniformly to obtain a mixed rubber, and standing the mixed rubber at room temperature for 24 hours;

and S4, adding a vulcanizing agent into the open mill, vulcanizing to obtain a sheet with the thickness of 5-10 mm, and discharging.

10. The method for preparing a high-elasticity conductive rubber shielding composite material according to claim 9, wherein the method comprises the following steps: the other compounding agent is any one of stearic acid, zinc oxide, an anti-aging agent, carbon black, paraffin oil, an accelerator and a vulcanizing agent.

Technical Field

The invention belongs to the technical field of functional material preparation, and particularly relates to a high-elasticity conductive rubber shielding composite material and a preparation method thereof.

Background

By functional composite is meant a composite that provides other physical properties in addition to mechanical properties. Such as electric conduction, superconduction, semi-conduction, magnetism, piezoelectricity, damping, wave absorption, wave transmission, friction, shielding, flame retardance, heat prevention, sound absorption, heat insulation and other functions. Collectively referred to as functional composites. The functional composite material mainly comprises a functional body or a reinforcement and a matrix. The functional body may be composed of one or more functional materials. The composite material of the multifunctional body may have various functions. Meanwhile, a new function can be generated due to a composite effect, and the conductive rubber is formed by uniformly distributing conductive particles such as silver-plated glass, silver-plated aluminum, silver and the like in silicon rubber and enabling the conductive particles to be contacted through pressure so as to achieve good conductive performance. Has application in both military and commercial applications. Its main function is sealing and electromagnetic shielding.

The Chinese patent net discloses an electromagnetic shielding rubber composite material and a preparation method thereof (with the publication number being CN101503534B), the patent only uses common materials of magnesium alloy, ferrite and polyaniline, and avoids expensive materials, so the cost is low, but the common materials of the magnesium alloy, the ferrite and the polyaniline have poor conductivity, are easy to react with sulfur at high temperature, consume sulfur, and cause the vulcanization degree of the rubber material to be obviously reduced and the elasticity to be reduced.

Therefore, the technical field of people provides a high-elasticity conductive rubber shielding composite material and a preparation method thereof to solve the problems in the background.

Disclosure of Invention

The invention aims to provide a high-elasticity conductive rubber shielding composite material and a preparation method thereof, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention adopts the following technical scheme: a high-elasticity conductive rubber shielding composite material is composed of the following raw materials in parts by weight: the composite material comprises 60-150 parts of natural rubber, 6-15 parts of chopped carbon fibers, 3-10 parts of an active agent, 30-90 parts of a reinforcing filler, 8-25 parts of a surface modified conductive filler, 5-15 parts of a conductive plasticizer and 2-4 parts of a compounding agent.

Preferably, the compounding agent is any one of stearic acid, zinc oxide, an anti-aging agent, carbon black, paraffin oil, an accelerator and a vulcanizing agent.

Preferably, the thickness of the natural rubber is 2-8 mm.

Preferably, the active agent is any one of zinc oxide, stearic acid, polyethylene glycol and stearate.

Preferably, the surface-modified conductive filler is any one of surface-modified carbon fiber and surface-modified carbon nanotube.

Preferably, the carbon fibers and the carbon nanotubes are both subjected to surface treatment by using a surfactant, and the surfactant comprises any one of an ether surfactant, a fatty acid soap surfactant, an amine ether surfactant and a silane coupling agent.

Preferably, the conductive plasticizer is an ester plasticizer.

Preferably, the ester plasticizer is any one of dioctyl phthalate, dioctyl terephthalate, trioctyl trimellitate, dioctyl sebacate, dioctyl adipate, diester oxalate and diisononyl phthalate.

A preparation method of a high-elasticity conductive rubber shielding composite material comprises the following steps:

s1, fully dispersing the chopped carbon fibers in a beater, carrying out suction filtration on the dispersion liquid, and fully drying to obtain chopped and dispersed carbon fiber monofilaments, wherein the diameter of the fibers is 4-9 mu m, and the length of the fibers is 1.5-2 mm;

s2, preparing natural rubber and chopped carbon fiber according to the normal-temperature weight part ratio of 100: 1-10, and preparing other accessory ingredients according to a conventional method;

s3, in an internal mixer or an open mill, firstly plasticating the natural rubber prepared according to the parts by weight for 3min, then sequentially adding an active agent, 1/2 parts of reinforcing filler and surface modified conductive filler, after banburying for 3min, adding the rest reinforcing filler and conductive plasticizer, banburying to 145 ℃ for rubber discharge, then adding chopped carbon fiber and other compounding agents for mixing, tabletting after mixing uniformly to obtain a mixed rubber, and standing the mixed rubber at room temperature for 24 hours;

and S4, adding a vulcanizing agent into the open mill, vulcanizing to obtain a sheet with the thickness of 5-10 mm, and discharging.

Preferably, the other compounding agent is any one of stearic acid, zinc oxide, an anti-aging agent, carbon black, paraffin oil, an accelerator and a vulcanizing agent.

The invention has the technical effects and advantages that: compared with the prior art, the invention takes the natural rubber with polarity as the main material, the conductive filler which is subjected to surface modification treatment is added, the use amount of each component is reasonably adjusted, and the conductive rubber with good conductive performance is prepared, the conductive rubber has lower volume resistivity, excellent elasticity, rebound resilience and tensile strength, the manufacturing cost is lower, and the electromagnetic shielding composite material is manufactured by combining the good physical and mechanical properties of the chopped carbon fiber, so that the electromagnetic shielding composite material not only has the excellent electromagnetic wave absorption performance of the chopped carbon fiber, but also has the excellent physical and mechanical properties of the rubber material, and can meet the requirements of various environments; the electromagnetic shielding performance is high, the preparation method is simple, the manufacturing cost is low, and the energy consumption is reduced.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.