阅读说明：本技术 一种用于电磁屏蔽领域的单层涂层碳纤维织物及其制备方法 (Single-layer coating carbon fiber fabric for electromagnetic shielding field and preparation method thereof ) 是由 刘元军 王翊 赵晓明 于 2020-06-05 设计创作，主要内容包括：本发明公开了一种单层屏蔽涂层织物的制备方法。选取碳纤维织物为基布,利用织物涂层法,在其表面整理石墨、石墨烯和镍粉。制备步骤为：(1)基布的准备：将合适大小的基布平整固定在涂层机针板架上。(2)涂料的制备：a称量一定量的石墨、石墨烯、镍粉和聚氨酯树脂。b设定搅拌器低速搅拌树脂,同时缓慢少量地加入功能粒子。待全部加入后,再以高速搅拌40min。c测定涂料粘度,若未达规定范围20000mPa·s～40000mPa·s,需少量多次添加增稠剂。(3)涂层织物的制备：设定涂层厚度为0.8mm～1.2mm,将涂料在涂层机上对基布进行涂层整理,置于烘箱内,80℃～100℃烘干10min,取出置于室温下固化24h。经测试,该材料具有优良的电磁屏蔽性能。(The invention discloses a preparation method of a single-layer shielding coating fabric. Selecting a carbon fiber fabric as a base fabric, and finishing graphite, graphene and nickel powder on the surface of the carbon fiber fabric by using a fabric coating method. The preparation steps are as follows: (1) preparing base cloth: and flatly fixing the base cloth with proper size on a needle board frame of the coating machine. (2) Preparation of the coating: a, weighing a certain amount of graphite, graphene, nickel powder and polyurethane resin. b setting the stirrer to stir the resin at a low speed, and simultaneously slowly adding a small amount of functional particles. After all the components are added, stirring at high speed for 40 min. c, measuring the viscosity of the coating, and if the viscosity of the coating does not reach the specified range of 20000 mPas-40000 mPas, adding a small amount of the thickening agent for a plurality of times. (3) Preparation of coated fabric: setting the thickness of the coating to be 0.8-1.2 mm, coating the coating on a coating machine to perform coating finishing on the base cloth, placing the base cloth in an oven, drying the base cloth for 10min at the temperature of 80-100 ℃, taking out the base cloth and placing the base cloth at room temperature for curing for 24 h. The material has excellent electromagnetic shielding performance after being tested.)

1. A preparation method of a single-layer shielding coating carbon fiber fabric is characterized by comprising the following steps:

(1) preparing base cloth: preparing cloth with proper size according to requirements, flatly fixing the cloth on a needle plate frame of a coating machine, and adjusting the cloth to proper tension.

(2) Preparation of the coating: a weigh a certain amount of functional particles (graphite, graphene and nickel powder in this study) and polyurethane resin. b, holding and fixing the beaker filled with the polyurethane resin on a stirrer, setting the stirrer to operate at low speed (about 600rad/min) for stirring the resin, slowly adding a small amount of functional particles into the resin in the process, and adding a certain amount of thickening agent after the functional particles are completely added to obtain the material. The stirrer was then set to run at high speed (about 2000rad/min) and the above materials were thoroughly stirred for 40min to ensure uniform mixing. c, measuring the viscosity of the uniformly stirred coating obtained in the step b, and if the viscosity does not reach the specified range of 20000mPa & s-40000 mPa & s, adding a small amount of thickening agent for many times under the low-speed (about 600rad/min) stirring state until the viscosity reaches the standard to obtain the required coating.

(3) Preparation of coated fabric: setting the thickness of the coating to be 0.8-1.2 mm, carrying out coating finishing on the base fabric prepared in the step (1) by the coating prepared in the step (2) on a coating machine, placing the coated fabric in an oven, drying for 10min at 80-100 ℃, taking out, and curing at room temperature for 24 h.

2. The single layer barrier coated fabric of claim 1, wherein the base fabric is a carbon fiber fabric.

3. The single-layer barrier-coated fabric according to claim 1, wherein the content (in mass% relative to the polyurethane) of the graphite functional particles is 20% to 40%, and the viscosity of the obtained coating is 20000 mPa-s to 40000 mPa-s.

4. The single-layer barrier-coated fabric according to claim 1, wherein the content (mass percentage of the graphene functional particles relative to the polyurethane) is 20% to 40%, and the viscosity of the obtained coating is 20000 mPa-s to 40000 mPa-s.

5. The single-layer barrier-coated fabric according to claim 1, wherein the content (mass percentage relative to polyurethane) of the nickel powder functional particles is 20% to 40%, and the viscosity of the obtained coating is 20000 mPa-s to 40000 mPa-s.

6. A single layer barrier coated fabric produced by the method of making a single layer barrier coated fabric of any one of claims 1 to 5.

Technical Field

The invention belongs to the technical field of electromagnetic shielding fabrics, and particularly relates to a preparation method of a single-layer shielding coating carbon fiber fabric.

Background

With the rapid development of national economy and telecommunication science and technology, various electronic communication devices are increasingly popularized, and when the energy of electromagnetic waves emitted by the devices during operation exceeds the standard, electromagnetic pollution can be caused, so that the normal operation of the electronic communication devices can be interfered, and the health and living environment of human beings can be adversely affected. Therefore, attention is paid to and the problem of electromagnetic pollution is solved, and the shielding material as a key material for the development of shielding technology is gradually extended from the initial military protection and stealth to the aspects of human body electromagnetic safety protection, electromagnetic interference prevention electronic equipment, information confidentiality and the like.

The graphite has excellent conductivity which can reach 2.5 × 10 at normal temperature³S/cm, a conductive network can be formed in the polymer matrix, and charge carriers move through a plurality of conductive paths, so that the electromagnetic wave shielding material has a good shielding effect. Graphene is a two-dimensional hexagonal honeycomb crystal composed of a single layer of carbon atoms, and pi electrons which are not bonded freely move in a two-dimensional plane, so that the graphene has excellent conductivity and shielding effect. The nickel powder has better conductivity and magnetic permeability, and is an ideal shielding material.

The carbon fiber belongs to carbon materials, has low density, high strength, good heat conduction, high modulus ratio and controllable resistance, and is widely used as a shielding composite material. However, the research on carbon fiber materials is shallow at present, most of the researches are focused on the relationship between resin matrix composite materials (carbon fibers are used as fillers) or carbon fiber arrangement modes and electromagnetic shielding performance, and the preparation of the electromagnetic shielding material by coating functional particles on carbon fiber fabrics by using a coating process is less.

Disclosure of Invention

The invention provides a single-layer coating fabric for solving the technical problems and a preparation method thereof, which are used in the field of electromagnetic shielding.

In order to achieve the purpose, the invention adopts the following technical scheme:

a preparation method of a single-layer shielding coating fabric comprises the following steps:

(1) preparing base cloth: preparing carbon fiber cloth with proper size according to requirements, flatly fixing the carbon fiber cloth on a needle board frame of a coating machine, and adjusting the carbon fiber cloth to proper tension.

(2) Preparation of the coating: a weigh a certain amount of functional particles (graphite, graphene and nickel powder in this study) and polyurethane resin. b, holding and fixing the beaker filled with the polyurethane resin on a stirrer, setting the stirrer to operate at low speed (about 600rad/min) for stirring the resin, slowly adding a small amount of functional particles into the resin in the process, and adding a certain amount of thickening agent after the functional particles are completely added to obtain the material. The stirrer was then set to run at high speed (about 2000rad/min) and the above materials were thoroughly stirred for 40min to ensure uniform mixing. c, measuring the viscosity of the uniformly stirred coating obtained in the step b, and if the viscosity does not reach the specified range of 20000mPa & s-40000 mPa & s, adding a small amount of thickening agent for many times under the low-speed (about 600rad/min) stirring state until the viscosity reaches the standard to obtain the required coating.

(3) Preparation of coated fabric: setting the thickness of the coating to be 0.8-1.2 mm, carrying out coating finishing on the base fabric prepared in the step (1) by the coating prepared in the step (2) on a coating machine, placing the coated fabric in an oven, drying for 10min at 80-100 ℃, taking out, and curing at room temperature for 24 h.

The base cloth is a carbon fiber fabric.

The content of the graphite functional particles (relative to the mass percent of polyurethane) is 20-40%, and the viscosity of the obtained coating is 20000 mPa-s-40000 mPa-s.

The content of the graphene functional particles (relative to the mass percent of polyurethane) is 20-40%, and the viscosity of the obtained coating is 20000 mPa-s-40000 mPa-s.

The content of the nickel powder functional particles (relative to the mass percent of polyurethane) is 20-40%, and the viscosity of the obtained coating is 20000 mPa-s-40000 mPa-s.

The invention has the advantages that:

when the carbon fiber is singly used as a shielding material, the defects of low magnetic conductivity, high dielectric constant and the like can exist, and different types of functional particles are coated on the carbon fiber, so that the excellent electromagnetic shielding effect of the carbon fiber is fully exerted, the integral magnetic conductivity and shielding effect are improved, and reference is provided for developing the fabric of the electromagnetic protective clothing.

Drawings

FIG. 1 is a flow chart of the preparation of a single layer barrier coated fabric of the present invention.

Fig. 2 is a graph showing the screening performance of the single-layer barrier coated fabric prepared in the example.

Detailed Description

The invention provides a preparation method of a single-layer shielding coating fabric, and the invention is further explained by combining a specific embodiment.