Environment-friendly type building thing interior wall electromagnetic screen coating and preparation method thereof
Technical field
The present invention relates to paint field, refer to particularly a kind of environment-friendly type building thing interior wall electromagnetic screen coating and preparation method thereof.
Background technology
Along with science and technology development with rapid changepl. never-ending changes and improvements, go away gradually people's the life of sci-tech product miscellaneous, household electrical appliance, everything has all improved people's working efficiency widely, has improved people's quality of life, but also injuring us in the moment, because they are all sending hertzian wave at any time.Hertzian wave is to the phenomenon of air-launched or leakage " electromagnetic radiation ", and electromagnetic radiation is divided into strong electromagnetic wave, low frequency, microwave etc.Electromagnetic radiation is colourless, tasteless, invisible, ubiquitous in daily life, and as long as various household electrical appliance, elevator(lift) machine room, communication base station, transmitting station, high-tension bus-bar, track traffic etc. are in running order, and its surrounding will exist electromagnetic radiation.Hertzian wave is one " double-edged sword ", and it can, for the mankind seek the well-being of, bring into play impayable effect in the fields such as communication and medical treatment on the one hand.But then, ubiquitous hertzian wave is also for the mankind's health has been brought threat.The electromagnetic pollution that the widespread use of electronic technology causes, has been acknowledged as " the fifth-largest public hazards " after topsoil, water pollution, noise pollution, solid waste.
China's Indoor Environment Detection center is also sent electromagnetic radiation and is had the six large warnings that endanger: 1. it is to cause one of leukemic reason of children most probably; 2. can bring out cancer and accelerate the cancer cell multiplication of human body; 3. affect people's reproductive system; 4. can cause children's intelligence incompleteness; 5. affect people's cardiovascular systems; 6. couple people's vision system has detrimentally affect.
The effect of electromagnetic shielding is the Electromagnetic Environmental Effect weakening in certain district being produced by some source of radiation, effectively controls the harm that hertzian wave produces to another area radiation from a certain region.Its action principle is to adopt low-resistance conductor material, because conductor material has reflection and guiding function to electromagnetic energy flow, produces electric current and the magnetic polarization contrary with source electromagnetic field in conductor material inside, thereby weakens the radiation effect of source electromagnetic field.When electromagnetic wave propagation arrives shielding material surface, conventionally decay by three kinds of different mechanism: (1) is at the reflection loss of incidence surface; (2) be not reflected and enter the hertzian wave of shielding by the decay of absorbed; (3) at the multiple attenuation of shielding inside.
In general, what electrical shielding material was decayed is the electric field of high resistance, and electric shielding can be made of thinner metallic substance; Hertzian wave just has absorption by shielding material, it and the linear increase of material thickness, and relevant with specific conductivity and the magnetic permeability of material.
At present, inner wall of building electromagnetic screen coating mainly comprises conductive powder body, organic carrier, organic additive.
Summary of the invention
The object of the invention is to overcome the weak point of above-mentioned existing background technology, and provide a kind of environment-friendly type building thing interior wall electromagnetic screen coating and preparation method thereof, can make external electromagnetic radiation effectively be reduced to harmless degree, do not affect mobile phone signal simultaneously, in addition, this coating, not containing precious metal and harmful heavy metal, is easy to construction, conduct electricity very well, have permanent.
The object of the invention is to reach by following technical solution: environment-friendly type building thing interior wall electromagnetic screen coating, it comprises the component of following mass percent: conductive powder body 60~80%, water-borne acrylic resin 18~30%, organic additive 2~10%.
The present invention is technical scheme preferably, environment-friendly type building thing interior wall electromagnetic screen coating, and it comprises the component of following mass percent: water-borne acrylic resin 18~30%, Conductive mica 40~60%, graphite 4~15%, carbon black 1~12%, anti-settling dispersion agent 1~5%, sequestrant 0.1~2%.
The good technical scheme of the present invention, environment-friendly type building thing interior wall electromagnetic screen coating, it comprises the component of following mass percent: water-borne acrylic resin 20~30%, Conductive mica 50~60%, graphite 5~10%, carbon black 4~12%, anti-settling dispersion agent 2~5%, sequestrant 0.5~2%.
The better technical scheme of the present invention, environment-friendly type building thing interior wall electromagnetic screen coating, it comprises the component of following mass percent: water-borne acrylic resin 30%, Conductive mica 55%, graphite 8%, carbon black 4%, Natvosol 2.5%, silicone based coupling agent 0.5%.
Preferably, conductive powder body described in such scheme is selected from following component: graphite, carbon black, Conductive mica.Usually, conductive powder body is selected from silver powder, nickel powder, copper powder, silver-plated copper powder, graphite, carbon black, Conductive mica etc., and wherein, silver powder is that coating property is stable, and shield effectiveness is splendid, but because its cost is high, can only be applicable to some special occasions; Nickel powder, copper powder, silver-plated copper powder are that coating price is moderate, and shield effectiveness is good, and resistance of oxidation is poor, belongs to heavy metal, unsuitable large-area applications; The carbon such as graphite and carbon black is that coating price is cheap, and shield effectiveness is good, but its color is black, uses not attractive in appearancely, has limited range of application; Its conductivity of conductive mica powder is poorer than other metal powder, needs to coordinate graphite and/or carbon black to use.
Preferably, described in such scheme, in conductive powder body, the mass ratio of Conductive mica, graphite and carbon black is 40~60:4~15:1~12.Wherein, conductive mica powder is take wet method white mica as matrix, adopts nanotechnology, by surface treatment, semiconductor doping processing, makes its stromal surface form electroconductibility zone of oxidation, and the class novel electron conducting function semi-conductor powder making.Conductive mica powder has following characteristics: (1) is flakey, tasteless, nontoxic, "dead", and outward appearance is canescence or light grey powder; (2) conductivity excellence, has, the easy dispersion of look shallow, heat-resisting (800 ℃ following stable), chemical stability highly corrosion resistant (acidproof, alkaline-resisting, fast light, organic solvent-resistant, be not oxidized, fire-retardant); (3) wave is good, and character is translucent.Share and can improve gloss and do not affect its color with coloured pigment, be used in conjunction with other pigment and can be made into various light color, colour; Graphite is as one of form of carbon, for layer structure, in layer, each carbon atom forms three equidistant keys with the sp2 hybridized orbital carbon atom adjacent with three, the spz track that has neither part nor lot in hydridization also has a lone electron, vertical with the direction of graphite linings, the lone electron of the spz track of each carbon atom is overlapped, forms delocalized pi-bond, these delocalized electrons move freely in whole carbon atom plane, have caused graphite upwards to have good electroconductibility being parallel to lamella place.Graphite composite powder purity is higher, degree of graphitization is higher, size distribution is wider, and electroconductibility is better; Conductive carbon black is a general designation, and its general reference conductive capability is better than the special kind of carbon black of ordinary carbon black, colour carbon black.Super-normal structure black particle is thin, and netted chain is piled up closely, and specific surface area is large, and unit mass particle is many, is conducive to form chain type conductive structure in polymkeric substance.The wide carbon black particle of size distribution more can be given conducting polymer than the carbon black particle of narrowly distributing.
In polymeric system, play the factor of electric action except the electroconductibility of added conductive powder body itself, also the distribution in polymkeric substance is relevant with conducting particles.The carbon black of equal quality and graphite, because carbon black proportion is less, it has occupied larger volume fraction in polymkeric substance, is conducive to form conductive network, does the better conductive effect of filler thereby obtained than Graphite Powder 99.Graphitized carbon black is formed with the high chain-like structure of ghost, through special processing, and product primary structure particle diameter 30nm, specific surface area is large, dispersed high, and the reticulated structure forming due to wadding aggregate makes itself to have the conductivity of extra-high-speed.
Preferably, organic additive described in such scheme comprises anti-settling dispersion agent and sequestrant.Because Conductive mica density is larger, in solution, easily sedimentation, need to be used anti-settling agent, to guarantee that coating placing after for some time, each material can not occur in coating by density stratification sedimentation; In addition, conductive carbon black is nanometer materials, and because particle diameter is little, surface atom ratio is large, and specific surface is large, and surface can be large, in energy unsteady state, is therefore easy to reunite.Therefore organic additive comprises anti-settling dispersion agent here, can prevent Conductive mica and graphite generation sedimentation, can play dissemination to conductive carbon black again.
Preferably, described in such scheme, anti-settling dispersion agent is selected from following component: Vltra tears, Natvosol, methylcellulose gum, soybean lecithin.Wherein, preferably Natvosol, Natvosol is a kind of white or faint yellow, tasteless, nontoxic fibrous or pulverulent solids, is prepared through etherification reaction by alkali cellulose and oxyethane (or chloroethanol), belongs to non-ionic type soluble fiber element ethers.Because Natvosol has good thickening, suspension, dispersion, emulsification, bonding, film forming, protection moisture and the characteristics such as protective colloid are provided, the fields such as coating, building, oil production, medicine food, weaving, papermaking and macromolecular polymerization reaction are widely used in.
Preferably, sequestrant described in such scheme is selected from following component: metatitanic acid lipid coupling agent, silicone based coupling agent.Wherein, the preferably silicone based coupling agent such as KH550, KH560, KH570, silane coupling agent has unique chemistry and physical property, can give two kinds different, be difficult to the stable bond between mating surface.Strengthen the bonding strength between coating and tackiness agent simultaneously, strengthen the resistibility to complex environment.
In such scheme, material component all can be obtained by market.
A preparation method for above-mentioned environment-friendly type building thing interior wall electromagnetic screen coating, it comprises the steps:
(1) above-mentioned each component is weighed respectively by mass percentage;
(2) load weighted Conductive mica and sequestrant, anti-settling dispersion agent are added in water-borne acrylic resin, fully stir 20 minutes with stirrer, in this step, sequestrant carries out surface treatment to conductive mica powder;
(3) graphite and carbon black are added respectively to coating again, fully stir 10 minutes;
(4) by three roller trailer rail system 3 times for the coating stirring in advance, three steel rider high speed rotating of three roller trailers produce powerful centrifugal force, can break up graphite and the carbon black of reunion, it is evenly distributed on around Conductive mica, and produce squeeze conductive compositions is combined closely, thereby form good conductive network.
In above-mentioned steps (1)~(4), separately can add on a small quantity other conducting powder according to practical situation, in addition, its operation: (1) base treatment metope should first carry out levelling, Puttying, crack treatment, parches; (2) process with 200 object Stainless Steel Cloths in the place in commute generation crack; (3) on metope, use aluminum foil and adhesive tape to form base conductive layer network, then base conductive layer network and ground wire are connected; (4) coating is fully stirred, use round brush technique uniformly electrically conducting coating to be coated with and to be carried out on metope.Can be coated with shoe multilayer according to practical situation.
Environment-friendly type building thing interior wall electromagnetic screen coating provided by the present invention, uses water soluble acrylic acid olefine resin as organic carrier.Compared with traditional Synolac, epoxy resin solvent based coating, Synolac, epoxy resin belong to solvent based coating, come dispersion resin and pigment with organic solvent as dimethylbenzene, toluene, acetone etc., form paint, when after coating application, its solvent is will evaporate in air, pollutes.Benzene is confirmed as high malicious carcinogenic substance by IARC, major effect hemopoietic system, neural system, skin is also had to hormesis, therefore should strictly control its content, water-borne coatings have price low, use safety, saving resource and the energy, reduce the advantages such as environmental pollution and public hazards, because becoming the main direction of current development coatings industry.Water soluble acrylic acid olefine resin coating is pollution-free coating with fastest developing speed in water-borne coatings, kind is maximum.For this coating obtains more preferably shield effectiveness, from microcosmic, conductive mica powder is flakey in addition, be dispersed in coating overlapped, thereby form conductive network, but there are a large amount of spaces in centre, greatly reduces conductivity.Add after other electro-conductive material such as graphite, conductive carbon black, it is filled in space, forms conductive network closely with Conductive mica, and conductivity significantly improves.The preparation method of environment-friendly type building thing interior wall electromagnetic screen coating provided by the present invention can make to be uniformly distributed between each component, and in conjunction with forming conductive network, better than simple mixing effect.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail:
With reference to GBT12190-2006 " measuring method of high-performance shielded cell effectiveness of shielding ", coating of the present invention is tested, take uncoated environment-friendly type building thing interior wall electromagnetic screen coating of the present invention as blank group A, to apply environment-friendly type building thing interior wall electromagnetic screen coating of the present invention as control group B:
1. testing circumstance: certain cell unit room, 3.3m × 4.2m, floor height 3m.
2. interior metope processing: (1) base treatment metope should first carry out levelling, Puttying, crack treatment, parches; (2) process with 200 object Stainless Steel Cloths in the place in commute generation crack; (3) on metope, use aluminum foil and adhesive tape to form base conductive layer network, then base conductive layer network and ground wire are connected; (4) coating is fully stirred, use round brush technique uniformly electrically conducting coating to be coated on metope.
3. test-results is as table 1:
Table 1 electromagnetic intensity test card
As shown in Table 1, can make external electromagnetic radiation effectively be reduced to harmless degree after applying environment-friendly type building thing interior wall electromagnetic screen coating of the present invention, not affect mobile phone signal simultaneously.
Embodiment 1: environment-friendly type building thing interior wall electromagnetic screen coating, it comprises the component of following weight part: it comprises the component of following mass percent: water-borne acrylic resin 20%, Conductive mica 60%, graphite 10%, carbon black 7%, Natvosol 2%, silicone based coupling agent 1%.
Water-borne acrylic resin, Conductive mica, graphite, carbon black, Natvosol, silicone based coupling agent are weighed respectively respectively by mass percentage; Load weighted Conductive mica and silicone based coupling agent, Natvosol are added in water-borne acrylic resin, fully stir 20 minutes with stirrer, in this step, silicone based coupling agent carries out surface treatment to conductive mica powder; Graphite and carbon black are added respectively to coating again, fully stir 10 minutes; By three roller trailer rail system 3 times for the coating stirring in advance, three steel rider high speed rotating of three roller trailers produce powerful centrifugal force, can break up graphite and the carbon black of reunion, it is evenly distributed on around Conductive mica, and produce squeeze conductive compositions is combined closely, thereby form good conductive network.
Embodiment 2:
Environment-friendly type building thing interior wall electromagnetic screen coating, it comprises the component of following weight part: it comprises the component of following mass percent: water-borne acrylic resin 24%, Conductive mica 50%, graphite 9%, carbon black 12%, Vltra tears 3%, metatitanic acid lipid coupling agent 2%.
Water-borne acrylic resin, Conductive mica, graphite, carbon black, Vltra tears, metatitanic acid lipid coupling agent are weighed respectively respectively by mass percentage; Load weighted Conductive mica and metatitanic acid lipid coupling agent, Vltra tears are added in water-borne acrylic resin, fully stir 20 minutes with stirrer, in this step, metatitanic acid lipid coupling agent carries out surface treatment to conductive mica powder; Graphite and carbon black are added respectively to coating again, fully stir 10 minutes; By three roller trailer rail system 3 times for the coating stirring in advance, three steel rider high speed rotating of three roller trailers produce powerful centrifugal force, can break up graphite and the carbon black of reunion, it is evenly distributed on around Conductive mica, and produce squeeze conductive compositions is combined closely, thereby form good conductive network.
Embodiment 3:
Environment-friendly type building thing interior wall electromagnetic screen coating, it comprises the component of following weight part: it comprises the component of following mass percent: water-borne acrylic resin 27%, Conductive mica 52%, graphite 5%, carbon black 10%, methylcellulose gum 5%, silicone based coupling agent 1%.
Water-borne acrylic resin, Conductive mica, graphite, carbon black, methylcellulose gum, silicone based coupling agent are weighed respectively respectively by mass percentage; Load weighted Conductive mica and silicone based coupling agent, methylcellulose gum are added in water-borne acrylic resin, fully stir 20 minutes with stirrer, in this step, silicone based coupling agent carries out surface treatment to conductive mica powder; Graphite and carbon black are added respectively to coating again, fully stir 10 minutes; By three roller trailer rail system 3 times for the coating stirring in advance, three steel rider high speed rotating of three roller trailers produce powerful centrifugal force, can break up graphite and the carbon black of reunion, it is evenly distributed on around Conductive mica, and produce squeeze conductive compositions is combined closely, thereby form good conductive network.
Embodiment 4:
Environment-friendly type building thing interior wall electromagnetic screen coating, it comprises the component of following weight part: it comprises the component of following mass percent: water-borne acrylic resin 30%, Conductive mica 55%, graphite 8%, carbon black 4%, Natvosol 2.5%, silicone based coupling agent 0.5%.
Water-borne acrylic resin, Conductive mica, graphite, carbon black, Natvosol, silicone based coupling agent are weighed respectively respectively by mass percentage; Load weighted Conductive mica and silicone based coupling agent, Natvosol are added in water-borne acrylic resin, fully stir 20 minutes with stirrer, in this step, silicone based coupling agent carries out surface treatment to conductive mica powder; Graphite and carbon black are added respectively to coating again, fully stir 10 minutes; By three roller trailer rail system 3 times for the coating stirring in advance, three steel rider high speed rotating of three roller trailers produce powerful centrifugal force, can break up graphite and the carbon black of reunion, it is evenly distributed on around Conductive mica, and produce squeeze conductive compositions is combined closely, thereby form good conductive network.
Embodiment 5:
Environment-friendly type building thing interior wall electromagnetic screen coating, it comprises the component of following weight part: it comprises the component of following mass percent: water-borne acrylic resin 30%, Conductive mica 53%, graphite 10%, carbon black 4%, soybean lecithin 2%, silicone based coupling agent 1%.
Water-borne acrylic resin, Conductive mica, graphite, carbon black, soybean lecithin, silicone based coupling agent are weighed respectively respectively by mass percentage; Load weighted Conductive mica and silicone based coupling agent, soybean lecithin are added in water-borne acrylic resin, fully stir 20 minutes with stirrer, in this step, silicone based coupling agent carries out surface treatment to conductive mica powder; Graphite and carbon black are added respectively to coating again, fully stir 10 minutes; By three roller trailer rail system 3 times for the coating stirring in advance, three steel rider high speed rotating of three roller trailers produce powerful centrifugal force, can break up graphite and the carbon black of reunion, it is evenly distributed on around Conductive mica, and produce squeeze conductive compositions is combined closely, thereby form good conductive network.
Embodiment 6:
Environment-friendly type building thing interior wall electromagnetic screen coating, it comprises the component of following weight part: it comprises the component of following mass percent: water-borne acrylic resin 18%, Conductive mica 55%, graphite 15%, carbon black 10%, Natvosol 1.9%, silicone based coupling agent 0.1%.
Water-borne acrylic resin, Conductive mica, graphite, carbon black, Natvosol, silicone based coupling agent are weighed respectively respectively by mass percentage; Load weighted Conductive mica and silicone based coupling agent, Natvosol are added in water-borne acrylic resin, fully stir 20 minutes with stirrer, in this step, silicone based coupling agent carries out surface treatment to conductive mica powder; Graphite and carbon black are added respectively to coating again, fully stir 10 minutes; By three roller trailer rail system 3 times for the coating stirring in advance, three steel rider high speed rotating of three roller trailers produce powerful centrifugal force, can break up graphite and the carbon black of reunion, it is evenly distributed on around Conductive mica, and produce squeeze conductive compositions is combined closely, thereby form good conductive network.
Embodiment 7:
Environment-friendly type building thing interior wall electromagnetic screen coating, it comprises the component of following weight part: it comprises the component of following mass percent: water-borne acrylic resin 30%, Conductive mica 40%, graphite 10%, carbon black 10%, Natvosol 5%, silicone based coupling agent 5%.
Water-borne acrylic resin, Conductive mica, graphite, carbon black, Natvosol, silicone based coupling agent are weighed respectively respectively by mass percentage; Load weighted Conductive mica and silicone based coupling agent, Natvosol are added in water-borne acrylic resin, fully stir 20 minutes with stirrer, in this step, silicone based coupling agent carries out surface treatment to conductive mica powder; Graphite and carbon black are added respectively to coating again, fully stir 10 minutes; By three roller trailer rail system 3 times for the coating stirring in advance, three steel rider high speed rotating of three roller trailers produce powerful centrifugal force, can break up graphite and the carbon black of reunion, it is evenly distributed on around Conductive mica, and produce squeeze conductive compositions is combined closely, thereby form good conductive network.
Embodiment 8:
Environment-friendly type building thing interior wall electromagnetic screen coating, it comprises the component of following weight part: it comprises the component of following mass percent: water-borne acrylic resin 30%, Conductive mica 62%, graphite 4%, carbon black 1%, Natvosol 1%, silicone based coupling agent 2%.
Water-borne acrylic resin, Conductive mica, graphite, carbon black, Natvosol, silicone based coupling agent are weighed respectively respectively by mass percentage; Load weighted Conductive mica and silicone based coupling agent, Natvosol are added in water-borne acrylic resin, fully stir 20 minutes with stirrer, in this step, silicone based coupling agent carries out surface treatment to conductive mica powder; Graphite and carbon black are added respectively to coating again, fully stir 10 minutes; By three roller trailer rail system 3 times for the coating stirring in advance, three steel rider high speed rotating of three roller trailers produce powerful centrifugal force, can break up graphite and the carbon black of reunion, it is evenly distributed on around Conductive mica, and produce squeeze conductive compositions is combined closely, thereby form good conductive network.
The content not being described in detail in this specification sheets belongs to the known prior art of professional and technical personnel in the field.