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Method for preparing coated electromagnetic shielding material

An electromagnetic shielding material and coating technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of difficult processing, easy corrosion, high density of metal shielding materials, etc., and achieve improved corrosion resistance and electrical conductivity. , the effect of reducing the density

Inactive Publication Date: 2018-12-07
郦璋
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0007] The technical problem mainly solved by the present invention is that the current traditional high-efficiency electromagnetic shielding materials are metal plates, such as steel plates, galvanized thin steel plates, copper plates, aluminum plates and other materials with good electrical conductivity. However, metal shielding materials have high density, are easy to corrode, and are not easy to Disadvantages such as processing greatly limit their applicable fields. When graphene is used as an electromagnetic shielding material, it is easy to form macroscopic aggregates due to the van der Waals force. A method for preparing a coated electromagnetic shielding material is provided.

Method used

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Examples

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Embodiment Construction

[0025]Add 60-70mL of ascorbic acid solution with a mass fraction of 10% into a three-neck flask equipped with a constant pressure dropping funnel and a stirrer, start the stirrer, start stirring at a speed of 300-320r / min, and heat it in a water bath to 50-55 ℃, add 40-50mL polyvinylpyrrolidone solution with a mass fraction of 1% into the three-necked flask with a constant pressure dropping funnel at a dropping rate of 4-6mL / min; Add ~120mL of ammonia water with a mass fraction of 5% and 40-50mL of silver nitrate solution with a mass fraction of 20% into two constant-pressure dropping funnels, and continue to pour into the above-mentioned three-necked flask at a dropping rate of 7-8mL / min. Add ammonia water and silver nitrate solution dropwise, and after the dropwise addition, filter and remove the filtrate to obtain nano-spherical silver powder; add 30-35mL toluene diisocyanate, 20- Heat 25mL of isophorone diisocyanate to 40-50°C, then drop 40-50mL of polyethylene glycol into...

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Abstract

The invention relates to the technical field of electromagnetic shielding material preparation, and in particular to a method for preparing a coated electromagnetic shielding material. Toluene diisocyanate, isophorone diisocyanate and polyethylene glycol as raw materials are reacted to obtain an elastic polyurethane prepolymer, and a photo-curing initiator, nano-spherical silver powder and flake silver powder are added to the elastic polyurethane prepolymer to obtain the coated electromagnetic shielding material. The electromagnetic shielding material can coat light matrixes such as plastics to achieve electromagnetic shielding effect, and the cost of the electromagnetic shielding material is effectively controlled while the electromagnetic shielding effect is guaranteed. Nano-conductive particles aggregate with each other by Brownian motion of the nano-conductive particles to form a conductive network, and the conductivity of the electromagnetic shielding material after curing is improved. In addition, in the process of UV light curing of the coating, the filling effect of conductive silver particles in pores among resin particles is better, so that shrinkage of the coating decreases during curing, and the application prospect is broad.

Description

technical field [0001] The invention relates to the technical field of preparation of electromagnetic shielding materials, in particular to a preparation method of a coated electromagnetic shielding material. Background technique [0002] With the improvement of people's living standards, the development of society and the advancement of science and technology, various household appliances, computers and other office automation equipment, mobile communication equipment, etc. have rapidly entered the office and home environment, which has brought great benefits to people's life and work. It is convenient, but it also brings electromagnetic pollution to people. Electromagnetic radiation will affect people's health, and it will also cause serious interference to electronic instruments and equipment, making their working procedures disordered and causing erroneous actions. Electromagnetic radiation can also leak information, making computers and other instruments without inform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/14C09D133/04C09D7/61
CPCC08K2003/0806C08K2201/011C09D7/61C09D7/70C09D175/14C08L33/04C08K7/18C08K3/08C08K3/042
Inventor 郦璋邓博陈帅
Owner 郦璋
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