Water based emulsion type electromagnetic wave screen paint and preparation method thereofOne, technical field
The invention belongs to the electromagnetic wave screen paint field, particularly a kind of water based emulsion type electromagnetic wave screen paint and preparation method thereof.
Two, background technology
Traditional electromagnetic wave screen paint is thinner with the organic solvent, and its shortcoming is: 1, preparation and can volatilize objectionable impurities when using, environment is polluted, and the infringement people's is healthy; 2, cost up.
The U.S. Patent Publication that application number is 4556506, the applying date is on December 3rd, 1985 a kind of waterborne conductive compositions, be prepared from by Bifunctionalized both sexes particle, polyacrylamide, no ionic surface active agent, metallics and water.The application documents of this patent have only illustrated that the electromagnetic wave shielding performance of this kind waterborne conductive compositions is stable, viscosity and dispersedly do not have considerable change in two, three months, and the place of matchmakers's electromagnetic frequency range and effectiveness of shielding that can shield not; In addition, from the component of selecting, Bifunctionalized both sexes particle needs preparation, and film-forming resin is single, only is polyacrylamide.
Three, summary of the invention
The present invention is directed to the deficiency that prior art exists, provide that a kind of price is low, starting material wide and be easy to obtain, electromagnet shield effect height in frequency is the 9KHz--1000MHz scope and isostatic water based emulsion type electromagnetic wave screen paint and preparation method thereof.
Water based emulsion type electromagnetic wave screen paint provided by the invention, its component and each components contents are:
Water-soluble film-forming resin 20--60 part
Conductive filler material 20--60 part
Pure water or clean tap water 30--100 part
Film coalescence aid 1--5 part
Thickening material 1--5 part
Above umber is parts by weight.
In the said components, water-soluble film-forming resin is determining weathering resistance, alkali resistance, the high temperature performance of water-borne coatings, the quality of sticking power, and film coalescence aid helps to guarantee in the volatilization process of water film formingly normally to carry out, and thickening material helps improving the viscosity of coating.
Water-soluble film-forming resin is a kind of in waterborne polyurethane resin, aqueous epoxy resins, water-based acrylic acid ester, aqueous polyethylene ester, the water soluble alkyd resin.
Film coalescence aid can be selected a kind of in hexanodioic acid, phthalic acid, propylene glycol, butyl glycol ether, methoxypropanol, the Diethylene Glycol for use.
Conductive filler material is at least a kind of in copper powder, aluminium powder, silver powder, nickel powder, the graphite, or is at least a kind of in the graphite that is coated with silvered film or copper plate or nickel layer, the glass granules.
Thickening material can be selected a kind of in pure aluminium silicate, ether of cellulose, alkali swelling acrylic acid fat, association type Polyurethane, the carbimide.
In order to improve the dispersiveness of conductive filler material in water, can add 1-5 part dispersion agent, optional majority phosphoric acid fat, boric acid fat, toxilic acid, vinyl benzenesulfonic acid, vinylbenzene---a kind of in the maleic anhydride as dispersion agent.
In preparation and use, produce foam in order to reduce coating, can add 1--5 part defoamer, can select a kind of in fatty acid ester, mineral oil, silicone oil, the siloxanes.
The preparation method of water based emulsion type electromagnetic wave screen paint provided by the invention has following technical process:
(1) with the conductive filler material oven dry, temperature is controlled at 50～80 ℃, and the time is Powdered with conductive filler material and exceeds;
(2) dried conducting filler and film coalescence aid, film-forming resin, pure water or clean tap water are mixed together, in grinding machine for grinding;
(3) mix the back and add thickening material, coating is adjusted to certain viscosity.
The water based emulsion type electromagnetic wave screen paint of method for preparing adopts brushing equipment to brush, dry at normal temperatures and curing.
The present invention has following beneficial effect:
1, the coating physical environment performance that is provided is good, and limits of harmful substances meets national standard, and specific performance sees the following form.
Table 1 physics and environmental performance test result
| Interventions Requested | Assay | The method of inspection |
| Sticking power, % | 96 | JC/T423-1991 |
| Water tolerance | Nothing comes off, and bubbles and the elephant skin phenomenon | JC/T423-1991 |
| Anti-xerotripsis, level | 0 | JC/T423-1991 |
| High temperature test | The no be full of cracks in surface, foaming, peeling phenomenon, sticking power is 95% | GJB150.3-1986 |
| Low-temperature test | The no be full of cracks in surface, foaming, peeling phenomenon, sticking power is 95% | GJB150.3-1986 |
| Alkali resistance | Occur to bubble, crackle peels off, efflorescence, phenomenons such as softening and stripping | GB/T9265-1988 |
| Pencil hardness | H | GB/T6739-1986 |
Limits of harmful substances test result in table 2 interior wall coating
| Interventions Requested | Technical requirements | Assay | Conclusion |
| Volatile organic compounds (voc) (g/L) | ≤200 | 175 | Qualified |
| Free formaldehyde (g/Kg) | ≤0.1 | ≤0.006 | Qualified |
| Heavy metal (mg/kg) | Dissoluble lead | ≤90 | 25 | Qualified |
| Soluble cadmium | ≤75 | 35 | Qualified |
| Soluble chromium | ≤60 | 25 | Qualified |
| Soluble mercury | ≤60 | Do not detect | Qualified |
2, the coating that is provided is in frequency is the 9KHz--1000MHz scope, and electromagnet shield effect is 45-60dB.
3, selected water-soluble film-forming resin is wide in variety, has been the material of suitability for industrialized production at home, is easy to obtain.
4, the use of film coalescence aid has improved the film forming properties of coating in drying process, and the use of thickening material has improved the viscosity of coating.
5, on particulates such as graphite, glass sphere, carry out the use of nickel plating or copper facing or the conductive filler material that forms such as silver-plated, help improving electromagnet shield effect, the physical environment performance of coating.
6, with water as thinner, reduced cost significantly.
7, formulation for coating material is flexible, and the preparation method is simple, applies easily.
Water based emulsion type electromagnetic wave screen paint provided by the invention is applied widely, can be to electric equipment products, and the anti-electromagnetic interference of buildings such as machine room, secret chamber, anti-information-leakage and anti-electromagnetic pollution are carried out electromagnetic shielding and are handled.
Four, embodiment
Embodiment 1:
The component of coating and each components contents (parts by weight) are as follows:
50 parts of water-based acrylic acid esters
15 parts of micron order nickel powders
15 parts of micron order aluminium powders
3 parts of methoxypropanol
2 parts of carbimides
40 parts of pure water
The preparation method of coating is as follows:
(1) nickel powder and aluminium powder make it be Powdered 60 ℃ of oven dry down;
(2) nickel powder and aluminium powder, methoxypropanol, water-based acrylic acid fat, pure water are mixed together,, make metal particle refinement, the even refinement of each component at grinding machine for grinding 10--20 minute;
(3) mix the back and add the thickening material carbimide, adjust dope viscosity.
Embodiment 2:
The component of coating and each components contents (parts by weight) are as follows:
50 parts of waterborne polyurethane resins
Be coated with 35 parts of the glass granules of copper plate
2 parts of hexanodioic acids
2 parts of silicone oil
3 parts of pure aluminium silicate
50 parts in clean tap water
The preparation method of coating is as follows:
(1) glass granules that will be coated with copper plate makes it be Powdered 50 ℃ of oven dry down;
(2) conductive filler material particulate, waterborne polyurethane resin, hexanodioic acid, silicone oil, pure water are mixed together, at grinding machine for grinding 10--20 minute, the refinement of conductive filler material particulate, the even refinement of each component;
(3) mix the back and add the thickening material pure aluminium silicate, adjust dope viscosity.
Embodiment 3:
The component of coating and each components contents (parts by weight) are as follows:
30 parts of water-base epoxy (I type) resins
Be coated with 60 parts of the graphite particulates of nickel layer
4 parts of propylene glycols
5 parts of ether of cellulose
2 parts in Tripyrophosphoric acid fat
90 parts of pure water
The preparation method of coating is as follows:
(1) graphite particulate that will be coated with nickel layer makes it be Powdered 70 ℃ of oven dry down;
(2) conductive filler material particulate, propylene glycol, Tripyrophosphoric acid fat, water-base epoxy (I type) resin, pure water are mixed together,, make the refinement of conductive filler material particulate, the even refinement of each component at grinding machine for grinding 10--20 minute;
(3) mix the back and add the thickening material ether of cellulose, adjust dope viscosity.
Embodiment 4:
The component of coating and each components contents (parts by weight) are as follows:
60 parts of aqueous polyethylene esters
40 parts of micron order nickel powders
5 parts of butyl glycol ethers
3 parts of association type Polyurethanes
2 parts of vinyl benzenesulfonic acids
2 parts of siloxanes
50 parts in clean tap water
The preparation method of coating is as follows:
(1) nickel powder is dried down at 70 ℃, make it be Powdered;
(2) conductive filler material nickel powder, butyl glycol ether, vinyl benzenesulfonic acid, siloxanes, aqueous polyethylene ester, clean tap water are mixed together,, make metal particle refinement, the even refinement of each component at grinding machine for grinding 10--20 minute;
(3) mix the back and add thickening material association type Polyurethane, adjust dope viscosity.