CN101880499B - Alcohol-soluble electromagnetic wave shielding coating - Google Patents

Abstract

The invention discloses an alcohol-soluble electromagnetic wave shielding coating, which comprises the following components by weight percentage: 20-50 percent of conductive powder, 25-45 percent of conductive resin, 0.5-2 percent of coupling agent, 2-4 percent of dispersing agent, 0.5-3 percent of alignment agent and 17-50 percent of alcohol solvent. The invention aims to overcome the defects of the domestic electromagnetic wave shielding coating at present, and provides a coating which can shield electromagnetic waves and effectively reduce the electromagnetic radiation pollution.

Description

A kind of alcohol-soluble electromagnetic wave shielding coating

Technical field

The present invention relates to a kind of alcohol-soluble electromagnetic wave shielding coating.

Background technology

Widespread use along with the development of the market universalness of the consumer electronics products such as mobile phone, televisor, video disc player, PC, digital audio-video, electronic game, automotive electronics, microwave oven, digital camera and electronics and information industry and hi-tech, powerful electronic electric equipment has formed complicated electromagnetic environmental pollution.And just with the speed increase of annual 7%--14%, electromagnetic environmental pollution is day by day serious for the electromagnetic energy of electromagnetic wave outside radiation, and electromagnetic radiation pollution has become the fourth-largest social effects of pollution after topsoil, water pollution, noise pollution.

One of the principal pollutant that must control are listed electromagnetic radiation in United Nations's human environment conference.The high-strength magnetic ripple that electromagnetic radiation had produced when both having comprised the operation such as electrical equipment such as television station, substation, hertzian wave launching tower also comprises the electromagnetic radiation that produces when the household electrical appliance such as computer, televisor, mobile phone, microwave oven use.These electromagnetic radiation are full of the space, and colorless and odorless is invisible, can penetrate the many kinds of substance that comprises human body.On the other hand, the electronic electric equipment susceptibility increase of electromagnetic environment to external world.Its major cause is, electronic electric equipment, makes it produce flase operation and be subject to outside electromagnetic interference, thereby has serious consequences to satisfy and the requirement of high speed, lightweight and miniaturization due to digitizing increasingly, Highgrade integration, signal level small quantization; In addition, engineering plastics due to lightweight, easy to process, with low cost, shape-designing flexibly and the application in electronic and electrical equipment is increasingly extensive, but engineering plastics are easy to produce static and stagnant electrical phenomena at elect magnetic field, almost without barrier action, be especially almost " transparent " to the hertzian wave below 1GHz to electromagnetic field.

Electromagnetic environmental pollution is as the large public hazards in the world one, the serious harm mankind's health and safety.And the electromagnetic information that causes the thus safety such as harm national politics, economy, military affairs, diplomacy of divulging a secret cause immeasurable loss.Its main harm shows:

1. Electromagnetic Interference endangers electronics.Electromagnetic interference can cause computer network to calculate and error of transmission, and TV images is disorderly, and phone noise etc. even also can produce serious harm to boat system of army of civil aviaton, traffic system, communication network, electrical means.

2. electromagenetic wave radiation causes information leakage.The hertzian wave that common computer leaks out can be received in certain distance and reappear.Along with constantly popularizing of computer information technology, consequent information leakage brings heavy losses can for national politics, military affairs, economy.

3. Contamination of Electromagnetic Wave threatens human health.The electromagenetic wave radiation dosage of some area mobile phone can reach 600 microwatts at present, surpasses country to 15 times of the human body radiation safety standards.Near TV and broadcasting station launching tower, the resident is under the radio field intensity of 1000V/m throughout the year, substantially exceeds public's level of protection value (10V/m) of regulation in the world.Near city electrician, medical radio-frequency equipment electromagnetic radiation pollution is also very serious, and what have is above standard more than 10 doubly.If the human body long-term exposure is under the radiation dose that surpasses safety, cell will be killed and wounded or kill by big area.Show according to foreign data, electromagnetic radiation has become one of etiology of current harm humans health.Investigation shows, in the 2 above hertzian wave of milligauss magnetic fields, the morbidity of crowd's leukemia is 2.93 times in home, and the muscle tumor morbidity is 3.26 times in home.Domestic and international most expert thinks, electromagnetic radiation is one of reason that causes leukemia of children, and can bring out human cancer cell's propagation, affect people's reproductive system, cause children's intelligence incomplete, affect people's cardiovascular systems, and people's vision system is had detrimentally affect.

Summary of the invention

The objective of the invention is in order to overcome the weak point in domestic existing electromagnetic wave screen paint technology, a kind of energy shielding electromagnetic wave is provided, can effectively reduce the coating of electromagnetic radiation pollution.

In order to achieve the above object, the present invention adopts following scheme:

A kind of alcohol-soluble electromagnetic wave shielding coating is characterized in that comprising by weight percentage following component:

Adopt dispersion machine with ethanol-soluble acrylic acid electroconductive resin high speed dispersion, add ethanol, then sneak into the micro nanometer silver copper-clad conductive powder body for preparing equally, carry out mechanical blending by high speed dispersion, then add successively respectively γ-aminopropyl triethoxysilane, ammonium salt dispersion agent, antimony-tin oxide nano-powder material, high speed dispersion one hour namely gets alcohol-soluble electromagnetic wave shielding coating to mixing.

The coupling agent KH-550 silane coupling agent produced of the sincere chemical industry of Nanjing Olympic company limited specifically in the present invention; γ-aminopropyl triethoxysilane is a kind of general amino coupling agent, and can be immediately fully water-soluble, pure, aromatic series and aliphatic hydrocarbon compound are widely used in and promote the bonding of inorganic and organic polymer material.Described dispersion agent is the 1124 type ammonium salt dispersion agents that Rhom and Hass produces.Described alcoholic solvent protection ethylene glycol and ethanol (its purity is more than 95%).

Beneficial effect of the present invention:

One, use antimony-tin oxide nano-powder material in the present invention as aligning agent, it has special photoelectric properties, the purpose that conductive powder body is reached align in the frequency range of 10MHz-1.5GHz, is used electromagnetic wave screen paint and is made more than shield effectiveness reaches 40-80dB;

When two, coating of the present invention formed the above coating of thickness 25 μ m, its resistivity reached 0.02 Ω cm;

Three, product of the present invention uses alcoholic solvent, has solved the adhesion problem of electromagnetic wave screen paint on the plastic rubber substrates such as ABS, PC, HIPS, PS, PP, PBT;

Four, product harmful substance contents of the present invention is few, the high-performances such as hardness is high, wear resistance good, the VOC discharging is low, particularly VOC discharging only has international requirement to greatest extent 1/10, the green chemical industry theory that meets low toxicity, environmental protection, cleaner production is for the producer and user have created good Working environment.

Embodiment

Below in conjunction with embodiment, the present invention is described further:

Embodiment 1

Alcohol-soluble electromagnetic wave shielding coating of the present invention comprises following component by weight percentage:

Adopt dispersion machine with ethanol-soluble acrylic acid electroconductive resin high speed dispersion, add ethanol, then sneak into the micro nanometer silver copper-clad conductive powder body for preparing equally, carry out mechanical blending by high speed dispersion, then add successively respectively γ-aminopropyl triethoxysilane, ammonium salt dispersion agent, antimony-stannic oxide (ATO) nano-powder material, high speed dispersion one hour namely gets alcohol-soluble electromagnetic wave shielding coating to mixing.

Embodiment 2

Alcohol-soluble electromagnetic wave shielding coating of the present invention comprises following component by weight percentage:

Adopt dispersion machine with ethanol-soluble acrylic acid electroconductive resin high speed dispersion, add ethanol, then sneak into the micron order fine silver conductive powder body for preparing equally, carry out mechanical blending by high speed dispersion, then add successively respectively γ-aminopropyl triethoxysilane, ammonium salt dispersion agent, antimony-stannic oxide (ATO) nano-powder material, high speed dispersion one hour namely gets alcohol-soluble electromagnetic wave shielding coating to mixing.

Embodiment 3

Alcohol-soluble electromagnetic wave shielding coating of the present invention comprises following component by weight percentage:

Adopt dispersion machine with ethanol-soluble acrylic acid electroconductive resin high speed dispersion, add ethanol, then sneak into the micrometer nickel conductive powder body for preparing equally, carry out mechanical blending by high speed dispersion, then add successively respectively γ-aminopropyl triethoxysilane, ammonium salt dispersion agent, antimony-stannic oxide (ATO) nano-powder material, high speed dispersion one hour namely gets alcohol-soluble electromagnetic wave shielding coating to mixing.

Embodiment 4

Alcohol-soluble electromagnetic wave shielding coating of the present invention comprises following component by weight percentage:

Adopt dispersion machine with ethanol-soluble acrylic acid electroconductive resin high speed dispersion, the mixture that adds ethanol and ethylene glycol, then sneak into the micrometer nickel conductive powder body for preparing equally, carry out mechanical blending by high speed dispersion, then add successively respectively γ-aminopropyl triethoxysilane, ammonium salt dispersion agent, antimony-stannic oxide (ATO) nano-powder material, high speed dispersion one hour namely gets alcohol-soluble electromagnetic wave shielding coating to mixing.

in order to verify the excellent properties of product of the present invention, electromagnetic screen coating in various embodiments of the present invention and domestic other electromagnetic screen coating products contrast, comparative sample 1 is the product of YL5001 for the model that Wuxi Yi Yue company produces, comparative sample 2 is the product of YL5003 for the model that Wuxi Yi Yue company produces, comparative sample 3 is the product of SS_606M for the model that Beijing Na Shengtong company produces, comparative sample 4 is the product of PB151 for the model that Chengdu Hua Yin company produces, comparative sample 5 is the product of PB152 for the model that Chengdu Hua Yin company produces, performance comparison the results are shown in Table 1, in product, limits of harmful substances detects (quoting the ROHS of European Union instruction) comparing result and sees Table 2.

Table 1 electromagnetic screen coating of the present invention and domestic other electromagnetic screen coating contrasts

The contrast of table 2 limits of harmful substances

Table 1 and the explanation of table 2 comparing result: the high-performances such as the product of various embodiments of the present invention has strong adhesion, shield effectiveness is good, hardness is high, wear resistance is good, the VOC discharging is low, particularly VOC discharging only has international requirement to greatest extent 1/10, the green chemical industry theory that meets low toxicity, environmental protection, cleaner production is for the producer and user have created good Working environment.

In order to verify that product of the present invention has good shield effectiveness, the present invention compares the product in each embodiment and import like product, wherein Comparative Examples 1 is the product of opalex10 for the clear model of producing with company of Japan, Comparative Examples 2 is the product of IsolexR65 for the model that Korea S BEE company produces, Comparative Examples 3 is the product of EcP502x for the model that TBA company produces, and Comparative Examples 3 is the product of J190 for the model that Trimite Ltd company produces.Comparing result sees Table 3:

The contrast of table 3 electromagnetic screen coating

Usually, specifically being categorized as of shield effectiveness: 0～10dB does not almost have shielding effect; 10～30dB has less shielding effect; 30～60dB is medium shield effectiveness, can be used for general industry or business electronics; 60～90dB shield effectiveness is better, can be used for the shielding of aerospace and military equipment equipment; The above shielding material of 90dB has best shield effectiveness, is applicable to require harsh high precision, high sensitive product.According to using needs, for the shielding material of most of electronic products, in 30～1000MHz range of frequency, its SE will reach 35dB above (corresponding volume specific resistance 0.02 Ω/below cm) at least, just thinks effective shielding.

Product shield effectiveness of the present invention reaches 70-80dB, reaches 25 μ m when above at coat-thickness, and its electric conductivity of silver-colored electric conduction paint reaches that 0.02 Ω/below cm, silver-colored copper-clad electric conduction paint electric conductivity reaches 0.2 Ω/cm, and shield effectiveness is very superior.

The solvent that the solvent that the present invention selects and existing electromagnetic screen coating are commonly used has carried out a contrast, and comparing result is as follows,

The parameter of table 4 all kinds of SOLVENTS

Solvent	Surface tension (mN/m)	Solubility parameter (J/m 3) 1/2	Relative evaporation rate
				Toluene	28.53	18.21	1.95
Dimethylbenzene	22.8	19.0	1.38
				Acetone	23.7	19.7	7.2
Ethyl acetate	23.75	18.2	5.25
				Ethylene glycol	22.27	23.7	0.45
Ethanol	22.32	26.5	0.01

Table 4 comparing result can be found out: the relative evaporation rate of alcoholic solvent series is low, surface tension, solubility parameter and the most frequently used toluene more approaching, therefore, select the alcoholic solvent system can reach the requirement of production high-quality electromagnetic screen coating.

In sum, product of the present invention has excellent anti-electro-magnetic screen function, can effectively control electromagenetic wave radiation, reduces dysfunction and pathological lesion that human body is produced, as pathologies such as neurasthenia, oligoleukocythemia; Product of the present invention belongs to take the alcohol solvent as main environmentally friendly machine, and diluted system has also reached environmental requirement; Harmless, and can effectively reduce the discharging of unwanted volatile in atmosphere; The sticking power of product of the present invention is better than GB/T1720-79 " paint film adhesion assay method " national standard, more than reaching 1H; Shield effectiveness is: in the frequency range of 10MHz-1.5GHz, the electromagnetic noise decay reaches 40-80dB; Product limits of harmful substances of the present invention meets the RoHS Directive requirement.

Claims (1)

1. alcohol-soluble electromagnetic wave shielding coating is characterized in that comprising by weight percentage following component:

Adopt dispersion machine with ethanol-soluble acrylic acid electroconductive resin high speed dispersion, add ethanol, then sneak into the micro nanometer silver copper-clad conductive powder body for preparing equally, carry out mechanical blending by high speed dispersion, then add successively respectively γ-aminopropyl triethoxysilane, ammonium salt dispersion agent, antimony-tin oxide nano-powder material, high speed dispersion one hour namely gets alcohol-soluble electromagnetic wave shielding coating to mixing.