CN105238179A - Waterborne electromagnetic shielding coating and preparation method thereof - Google Patents
Waterborne electromagnetic shielding coating and preparation method thereof Download PDFInfo
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- CN105238179A CN105238179A CN201510672393.5A CN201510672393A CN105238179A CN 105238179 A CN105238179 A CN 105238179A CN 201510672393 A CN201510672393 A CN 201510672393A CN 105238179 A CN105238179 A CN 105238179A
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Abstract
The invention relates to a preparation method of waterborne electromagnetic shielding coating. According to the formulation, the waterborne electromagnetic shielding coating is prepared from, by weight, 10.0-60.0 parts of water, 0.1-0.3 part of wetting agents, 0.4-0.8 part of dispersant, 0.1-0.3 part of defoamer, 0.7-1.3 parts of anti-freezing agents, 0.2-0.5 part of pH modifier, 20.0-60.0 parts of electromagnetic shielding additives, 0.5-2.0 parts of thickener, 25.0-40.0 parts of acrylic emulsion, 0.8-1.3 parts of coalescing agents, 0.2-0.4 part of preservative, 0.3-0.6 part of mould-proof anti-alga agents and 0.1-0.3 part of theological additives. The preparation method has the following advantages that the waterborne electromagnetic shielding coating prepared from graphene/nano ferrite, zinc oxide whiskers, nano silicon carbide, nanometal nickel powder and other materials has the advantages of being light, wide in frequency band, excellent in shielding performance, safe, environmentally friendly and the like, and the requirements of the electromagnetic shielding materials for impedance matching are met.
Description
Technical field
The present invention relates to a kind of water-borne coatings, specifically the materials such as graphene/nanometer ferrite base, ZnOw, nanometer silicon carbide, nano metal nickel powder are carried out Application of composite in high-performance water-based electromagnetic screen coating and preparation method thereof.。
Background technology
Electronics, electrically, the develop rapidly of communication and information industry is the life of people, work bring huge simultaneously easily, electromagenetic wave radiation is polluted and becomes a kind of new environmental pollution after contaminated wastewater, exhaust emission, noxious waste pollution, sound pollution, not only severe jamming is caused to people's periodic traffic equipment, computer and other electronic system, serious threat is caused to information security, and immeasurable infringement is brought to HUMAN HEALTH.Absorbing material is that a class can absorb, decaying projects the hertzian wave on its surface, and converts it into the functional materials that thermal energy consumption dissipates or make hertzian wave to disappear because of interference.Adopt absorbing material to prevent electromagenetic wave radiation from polluting with protection of the environment, ensuring information safety and HUMAN HEALTH, become current key subjects of making great efforts to explore in the world.In various absorbing material, antiradar coatings and electromagnetic wave screen paint are extensive with its selection, easy construction is flexible, practical and cost performance high and gaining great popularity.
Along with develop rapidly and human health quality's raising of modern high technology, requirements at the higher level are proposed to the performance such as absorption frequency scope, absorption intensity, resistance toheat, erosion resistance, density of electromagnetic screen coating.Therefore, the research and development of novel electromagnetic shielding coating have become the focus of investigator's extensive concern.
Electromagnetic screen coating conventional at present can be divided into eigenmode and mixed type.Eigenmode electromagnetic screen coating mainly with conductive polymers as polyaniline, polypyrrole etc. and other mixed with resin form composite coating, its cost is higher.Blending type electromagnetic screen coating is mainly made up of resin, thinner, additive and conductive filler material etc.Wherein blending type electromagnetic screen coating due to cost reasonable, more and more receive the concern of people.To this kind of electromagnetic screen coating, filler is the deciding factor of coating capability of electromagnetic shielding, and the filler of mixed type electromagnetic screen coating is mainly electro-conductive material, as series such as silver system, nickel system, copper system, carbon systems at present.
There is the shortcomings such as absorption band is narrow, absorbing property is poor in single conductive filler material, is difficult to meet the shielding requirements day by day improved.And the composite wave-suction material having dielectric loss and magnetic loss concurrently can play the advantage of each component, make up its inferior position, play more and more important role in electromagnetic shielding field.Based on the requirement to electromagnetic screen coating lightweight, wideband, if the materials such as graphene/nanometer ferrite, ZnOw, nanometer silicon carbide, nano metal nickel powder are carried out compound, prepare the graphene/nanometer ferrite composite wave-suction material of electroconductibility and the good magnetic property of nanometer ferrite having Graphene concurrently, prepare electromagnetic screen coating with resin and other auxiliary agent compound again, then can make up Graphene and only possess conduction loss and without the shortcoming of magnetic loss.The impedance matching of electromagnetic absorption can be realized, widen absorption frequency range, improve the absorbing property of single conductive filler material, thus meet the composite request of practical application to electromagnetic shielding material " thin, light, wide, strong ".
The present invention mainly adopts aqueous acrylic emulsion to be film forming binder, graphene/nanometer ferrite composite wave-suction material is filler, develop lightweight broad-band high-performance and the electromagnetic screen coating of environment-friendly type, improve scientific and technological content and the added value of this series products, shorten the gap with advanced country in the world, to reach the requirement of the numerous areas such as science and technology, information, communication, household electrical appliances and military affairs such as current mobile phone, televisor, printer, medical facilities, aircraft.
Summary of the invention
This project aims to provide a kind of aqueous electromagnetic shielding coating, and the materials such as graphene/nanometer ferrite base, ZnOw, nanometer silicon carbide, nano metal nickel powder are carried out Application of composite in the preparation method of high-performance water-based electromagnetic screen coating.Specifically with inexpensive crystalline flake graphite for raw material, oxidation style is adopted to make it peel off into the graphene oxide of single or multiple lift, and reduce at the ferritic graphene oxide that makes of its surface loaded magnetic simultaneously, recover its graphene-structured, due to great radius-thickness ratio, the sheet single or multiple lift graphene/nanometer ferrite of little amount can form the conductive network of both magnetic in coating matrix, the group that graphenic surface is residual in addition can make itself and matrix have good consistency and dispersion stabilization, thus in wide frequency range, give coating high electromagnet shield effect; ZnOw material is isotropy, under electromagnetic microwave energy irradiates, has great activity, molecule, electron motion can be made to aggravate, and promotes magnetization, polarization and conduction motion, makes electromagnetic energy be heat energy, thus play anti-electromagnetic radiation function; Nanometer silicon carbide not only has certain absorbing property as electromagnetic radiation wave absorbing agent, also have high temperature resistant, relative density is little, resistivity advantages of higher; After nanometer silicon carbide and magnetic Nano agent (as nano metal nickel powder) compound, wave-absorbing effect can also be significantly high; Nano metal nickel powder has good electroconductibility and magnetic diffusivity, resistance of oxidation is very strong, especially have good shield effectiveness at high band, shield effectiveness reaches 30 ~ 50dB, mixes nano metal nickel powder and its shield effectiveness can be made to obtain the reflection loss of more than 10dB in VHF frequency range.
A kind of aqueous electromagnetic shielding coating of the present invention is by selecting aqueous coating system, adopt have capability of electromagnetic shielding good graphene/nanometer ferrite, ZnOw, nanometer silicon carbide, nano metal nickel powder as main shielding material, manufactured by optimization of C/C composites technique.The preparation method of a kind of aqueous electromagnetic shielding coating of the present invention, formula proportioning is as follows:
10.0 ~ 60.0 parts, water
Wetting agent 0.1 ~ 0.3 part
Dispersion agent 0.4 ~ 0.8 part
Defoamer 0.1 ~ 0.3 part
Frostproofer 0.7 ~ 1.3 part
PH adjusting agent 0.2 ~ 0.5 part
Electromagnetic shielding additive 20.0 ~ 60.0 parts
Thickening material 0.5 ~ 2.0 part
ACRYLIC EMULSION 25.0 ~ 40.0 parts
Film coalescence aid 0.8 ~ 1.3 part
Sanitas 0.2 ~ 0.4 part
Mildew-resistant algae-resistant agent 0.3 ~ 0.6 part
Auxiliary rheological agents 0.1 ~ 0.3 part;
Described wetting agent is at least one in DOW Chemical BD-109, Clariant LCN407, the modest FX365 of moral;
Described dispersion agent is Nuo Puke chemistry SN-5040, " easy soon " of DOW Chemical, vapour cling at least one in chemical N-40;
Described defoamer is at least one in the peaceful Foamstar223 of section, Blackburn CF1369, Sheng Nuopuke SN-DEFOAMER328;
Described antifreezing agent is at least one in ethylene glycol, propylene glycol;
Described pH adjusting agent is at least one in Sears chemical industry Ammonia, DOW Chemical AMP-95, watt gram BS168;
Described electromagnetic shielding additive is by graphene/nanometer ferrite composite material, ZnOw, nano metal nickel powder, nanometer silicon carbide forms, weight: graphene/nanometer ferrite composite material: ZnOw: nano metal nickel powder: nanometer silicon carbide=0.01 ~ 3: 0 ~ 1: 0 ~ 1: 0 ~ 1, graphene/nanometer ferrite composite material is wherein the material that Beijing Institute of Technology produces, ZnOw is the AT-86 of Chengdu National Chiao Tung University Jingyu Technology Co, nanometer silicon carbide nano metal nickel powder is the high-activity nano nickel powder of Changsha nano Mei Si Materials Co., Ltd, nanometer silicon carbide is the nanometer silicon carbide of Hefei Kaier Nano Energy Source Science Co., Ltd,
Described thickening material is at least one in DOW Chemical DR-72, the modest RHEOLATE420 of moral, DOW Chemical TT-615;
Described ACRYLIC EMULSION is at least one of DOW Chemical AC-261P, silver dollar resin YC-8360, new photoinitiator chemical XG-2606;
Described film coalescence aid is Yi Shiman Texanol, Yi Shiman OE300, at least one of moistening in safe chemical C-12;
Described sanitas is at least one in Sol ActicdeRS, enlightening beautiful KSG103, DOW Chemical LXE;
Described mildew-resistant algae-resistant agent is at least one in Sol ACTICIDEEPW, the beautiful BDM film preservative of enlightening, Sol EWPASTE;
Described auxiliary rheological agents is at least one in sub-Silan chemistry NLS210, DOW Chemical RM-2020NPR, Sheng Nuopuke SN-THICKENER612.
The preparation method of described a kind of aqueous electromagnetic shielding coating is as follows:
By formulation weight part proportioning, water is dropped into Scattered Kettle, under agitation drop into wetting agent, dispersion agent, defoamer, antifreezing agent, pH adjusting agent successively again, slowly thickening material is dropped into after stirring, drop into material high speed dispersion to the fineness such as graphene/nanometer ferrite composite material, ZnOw, nanometer silicon carbide, nano metal nickel powder again and be less than 60um, then drop into emulsion, be uniformly dispersed after drop into film coalescence aid, sanitas, mildew-resistant algae-resistant agent, auxiliary rheological agents, stir and namely obtain finished product.
A kind of aqueous electromagnetic shielding coating of the present invention and preparation method thereof has the following advantages:
1. the problem of the narrow effectiveness of shielding difference of shielding frequency band is there is according to existing single conductivity type electromagnetic screen coating, functional materials used to have the ferrite nano material of magnetic and absorbing property and to have the Graphene compound of superior electrical conductivity, adopts the material preparations such as ZnOw, nanometer silicon carbide, nano metal nickel powder to have the electromagnetic screen coating of electroconductibility and magnetic concurrently simultaneously.
2. have aqueous electromagnetic shielding coating prepared by the materials such as graphene/nanometer ferrite, ZnOw, nanometer silicon carbide, nano metal nickel powder the features such as concurrently lightweight, broadband, superior barrier usefulness, safety and environmental protection, meet the requirement of electromagnetic shielding material to impedance matching, novelty is obvious.
Embodiment
Embodiment 1
By weight ratio, 10.0 parts of water are dropped into Scattered Kettle, DOW Chemical BD-1090.1 part, Sheng Nuopuke chemistry SN-50400.4 part, Sheng Nuopuke SN-DEFOAMER3280.1 part, propylene glycol 0.7 part, watt gram BS1680.5 part is dropped into successively under 500 revs/min of rotating speeds, be uniformly dispersed, slowly add the modest RHEOLATE4201.8 part of moral, add graphene/nanometer ferrite composite material 12.0 parts, nanometer silicon carbide 4.0 parts, nano metal nickel powder 4.0 parts, promote rotating speed and within 30 minutes, be less than 60um to fineness to 1000 revs/min of high speed dispersion; Drop into DOW Chemical AC-261P32.0 part, dispersion more successively and after 5 minutes, drop into Yi Shiman OE3001.3 part, the beautiful KSG1030.2 part of enlightening, the beautiful BDM film preservative 0.6 part of enlightening, sub-Silan chemistry NLS2100.1 part, stir and namely obtain finished product.
Embodiment 2
By weight ratio, 18.0 parts of water are dropped into Scattered Kettle, Clariant LCN4070.2 part is dropped into successively under 900 revs/min of rotating speeds, Sheng Nuopuke chemistry SN-50400.5 part, Blackburn CF13690.2 part, ethylene glycol 1.0 parts, DOW Chemical AMP-950.3 part, be uniformly dispersed, slowly add the modest RHEOLATE4200.5 part of moral, add graphene/nanometer ferrite composite material 0.133 part, ZnOw 13.289 parts, nanometer silicon carbide 13.289 parts, nano metal nickel powder 13.289 parts, promote rotating speed and within 30 minutes, be less than 60um to fineness to 1000 revs/min of high speed dispersion, drop into silver dollar resin YC-836025.0 part again, disperse after 3 minutes, to drop into the safe chemical C-121.8 part of profit, DOW Chemical LXE0.4 part, Sol ACTICIDEEPW0.3 part, DOW Chemical RM-2020NPR0.2 part, stir and namely obtain finished product.
Embodiment 3
By weight ratio, 60.0 water are dropped into Scattered Kettle, moral modest FX3650.3 part, Sheng Nuopuke chemistry SN-50400.8 part, the peaceful Foamstar2230.8 part of section, propylene glycol 1.3 parts, Sears chemical industry Ammonia0.2 part is dropped into successively under 600 revs/min of rotating speeds, be uniformly dispersed, slowly add DOW Chemical TT-6152.0 part, add graphene/nanometer ferrite composite material 24.0 parts, ZnOw 12.0 parts, nanometer silicon carbide 12.0 parts, nano metal nickel powder 12.0 parts, promote rotating speed and within 30 minutes, be less than 60um to fineness to 1000 revs/min of high speed dispersion; Drop into new photoinitiator chemical XG-260640.0 part again, disperse the SN-THICKENER6120.3 part of Yi Shiman Texanol0.8 part, Sol ActicdeRS0.3 part, Sol EWPASTE0.4 part, Sheng Nuopuke after 3 minutes, stir and namely obtain finished product.
Comparative example 4
By weight ratio, 54.3 parts of water are dropped into Scattered Kettle, under 600 revs/min of rotating speeds, drops into Clariant LCN4070.2 part, DOW Chemical easy 0.5 part soon, the peaceful Foamstar2230.3 part of section, ethylene glycol 1.2 parts, DOW Chemical AMP-950.3 part successively, promote rotating speed to 800 revs/min of dispersions 15 minutes; Slow input DOW Chemical TT-6150.5 part, drop into DOW Chemical AC-261P40.0 part successively again, disperse after 5 minutes, to drop into the safe chemical C-121.8 part of profit, the beautiful KSG1030.2 part of enlightening, Sol EWPASTE0.4 part, DOW Chemical RM-2020NPR0.3 part, stir and namely obtain finished product.
Following methods is adopted to measure to the salient features of the product of embodiment 1 ~ 3, comparative example 4:
1. sticking power measures: by GB/T1720-79 standard, test with QFZ type paint film adhiesion test instrument.
2. the mensuration of time of drying: measure by surface drying second law regulation in GB/T1728-1979 paint film putty membrane assay method time of drying.
3. package stability measures: loaded by about 800mL finishing paint sample in 1L plastics pot, sealing, puts into (50 ± 2) DEG C baking oven, store and take out after 30 days, and room temperature places 3h, opens plastics pot and observes sample property to evaluate.
4. electromagnet shield effect test: by SJ20524-1995 standard, adopt the flange coaxial test macro be jointly made up of E5071C type network vector analyser and far field coaxial test device to measure the capability of electromagnetic shielding of sample.
The correlated performance test result of a kind of aqueous electromagnetic shielding coating of embodiment 1 ~ 3, comparative example 4 gained is as shown in table 1 below:
Table 1
As can be seen from the above table, a kind of aqueous electromagnetic shielding coating of the present invention, compared with prior art (comparative example 4), significantly improves the capability of electromagnetic shielding of product.
Claims (5)
1. an aqueous electromagnetic shielding coating, its feature part is, formula proportioning comprises:
Water 10.0 ~ 60.0
Wetting agent 0.1 ~ 0.3
Dispersion agent 0.4 ~ 0.8
Defoamer 0.1 ~ 0.3
Frostproofer 0.7 ~ 1.3
PH adjusting agent 0.2 ~ 0.5
Electromagnetic shielding additive 20.0 ~ 60.0
Thickening material 0.5 ~ 2.0
ACRYLIC EMULSION 25.0 ~ 40.0
Film coalescence aid 0.8 ~ 1.3
Sanitas 0.2 ~ 0.4
Mildew-resistant algae-resistant agent 0.3 ~ 0.6
Auxiliary rheological agents 0.1 ~ 0.3.
2. a kind of aqueous electromagnetic shielding coating as claimed in claim 1, its feature part is, described wetting agent is at least one in DOW Chemical BD-109, Clariant LCN407, the modest FX365 of moral; Dispersion agent is Nuo Puke chemistry SN-5040, " easy soon " of DOW Chemical, vapour cling at least one in chemical N-40; Defoamer is at least one in the peaceful Foamstar223 of section, Blackburn CF1369, Sheng Nuopuke SN-DEFOAMER328; Described antifreezing agent is at least one in ethylene glycol, propylene glycol; PH adjusting agent is at least one in Sears chemical industry Ammonia, DOW Chemical AMP-95, watt gram BS168; Thickening material is at least one in DOW Chemical DR-72, the modest RHEOLATE420 of moral, DOW Chemical TT-615; ACRYLIC EMULSION is at least one of DOW Chemical AC-261P, silver dollar resin YC-8360, new photoinitiator chemical XG-2606; Film coalescence aid is Yi Shiman Texanol, Yi Shiman OE300, at least one of moistening in safe chemical C-12.
3. a kind of aqueous electromagnetic shielding coating as claimed in claim 1, its feature part is, described electromagnetic shielding additive is by graphene/nanometer ferrite composite material, ZnOw, nano metal nickel powder, nanometer silicon carbide forms, weight: graphene/nanometer ferrite composite material: ZnOw: nano metal nickel powder: nanometer silicon carbide=0.01 ~ 3: 0 ~ 1: 0 ~ 1: 0 ~ 1, graphene/nanometer ferrite composite material is wherein the material that Beijing Institute of Technology produces, ZnOw is the AT-86 of Chengdu National Chiao Tung University Jingyu Technology Co, nanometer silicon carbide nano metal nickel powder is the high-activity nano nickel powder of Changsha nano Mei Si Materials Co., Ltd, nanometer silicon carbide is the nanometer silicon carbide of Hefei Kaier Nano Energy Source Science Co., Ltd.
4. a kind of aqueous electromagnetic shielding coating as claimed in claim 1, its feature part is, described sanitas is at least one in Sol ActicdeRS, enlightening beautiful KSG103, DOW Chemical LXE; Mildew-resistant algae-resistant agent is at least one in Sol ACTICIDEEPW, the beautiful BDM film preservative of enlightening, Sol EWPASTE; Auxiliary rheological agents is at least one in sub-Silan chemistry NLS210, DOW Chemical RM-2020NPR, Sheng Nuopuke SN-THICKENER612.
5. the preparation method of a kind of water-based finishing paint according to claim 1, it is levied part and is, by formulation weight proportioning, water is dropped into Scattered Kettle, under agitation drop into wetting agent successively again, dispersion agent, defoamer, antifreezing agent, pH adjusting agent, slowly thickening material is dropped into after stirring, drop into graphene/nanometer ferrite composite material again, ZnOw, nanometer silicon carbide, material high speed dispersion to the fineness such as nano metal nickel powder are less than 60um, then emulsion is dropped into, film coalescence aid is dropped into after being uniformly dispersed, sanitas, mildew-resistant algae-resistant agent, auxiliary rheological agents, stir and namely obtain finished product.
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