CN104310907A - Electromagnetic shielding mortar for coating and preparation method of electromagnetic shielding mortar for coating - Google Patents
Electromagnetic shielding mortar for coating and preparation method of electromagnetic shielding mortar for coating Download PDFInfo
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- CN104310907A CN104310907A CN201410548725.4A CN201410548725A CN104310907A CN 104310907 A CN104310907 A CN 104310907A CN 201410548725 A CN201410548725 A CN 201410548725A CN 104310907 A CN104310907 A CN 104310907A
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Abstract
The invention discloses electromagnetic shielding mortar for coating and a preparation method of the electromagnetic shielding mortar for coating. The electromagnetic shielding mortar for coating comprises the following components: 820-840kg/m<3> of gel materials, 1650-1700kg/m<3> of aggregates, 370-380kg/m<3> of water, and conductive flexible fibers with volume fraction of 0.5-1.5%. The electromagnetic shielding mortar for coating disclosed by the invention has the beneficial effects of wide raw material source, low cost, simple preparation and construction process, no need of large-scale equipment, small density and capacity of satisfying the requirements of the common electronic industry on electromagnetic shielding effect in comparison with the shielding concrete. Compared with the common mortar for coating, the surfaces of the mixed conductive flexible fibers are rough, the adhesion properties with the gel materials are relatively good, the integral strength of the mortar is improved, and the fall-off phenomenon is unlikely to happen.
Description
Technical field:
The present invention relates to a kind of electromagnetic shielding plastering mortar and preparation method thereof, belong to building material field.
Background technology:
Along with the high speed development of modern electronics industry and the generally use of each electronic product, dynamic communication, broadcast, radar, magnetic therapy, computer etc. become in people's daily life also makes electromagenetic wave radiation become a kind of new social effects of pollution while frequent contacting electronic equipments.Electromagnetic radiation can affect the healthy of people, and Long Term Contact electromagnetic radiation can bring out multiple mankind's incurable disease such as cancer, leukemia, simultaneously electromagnetic radiation can also inducing plant transgenation, harm the crops growth, destruction ecotope.In addition, electromagnetic radiation also can cause severe jamming to the electronic equipment of surrounding, and the working routine occurred sequence making them disorderly, produces misoperation; Meanwhile, electromagnetic radiation meeting reveal information, makes the instruments such as computer without security assurance information.
Electromagnetic Shielding Concrete becomes the preferred material of electromagnetic shielding at present, so-called Electromagnetic Shielding Concrete be exactly inside normal concrete admixture ferrite, graphite, fiber-like electro-conductive material etc. increase concrete conductivity, thus reach the effect of shielding electromagnetic wave.Specifically being categorized as of usual 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 commercial power subset; 60 ~ 90dB shield effectiveness is higher, can be used for the shielding of aerospace and military equipment equipment.For general industry, covil construction as: high voltage transmission line, substation, radar monitoring station etc., electromagnetic radiation is generally not more than 50dB, and 220 ~ 330kV transmission line greatest irradiation is 30dB, and 500kV transmission line greatest irradiation is 32dB.Although Electromagnetic Shielding Concrete shield effectiveness is better, its mix-design process is complicated, and required starting material are more, density is large, and cost is higher, and needs main equipment in construction process, construction is complicated, after mixing graphite, can greatly reduce concrete mechanical property in concrete simultaneously.To effectiveness, lower building is required for general industry, civilian etc., adopts shielding concrete often to cause the wasting of resources.Existing common buildings plastering mortar resistivity is comparatively large, and conductivity is lower, and therefore shield effectiveness is lower, thinner architectural of some plastering mortars, does not even have electromagnetic shielding action.Building plastering mortar is by the effect such as cement drying shrinkage, weathering, and bulk strength is low, the problem such as easily cause wall skin to ftracture, to come off.
Summary of the invention:
The present invention is to solve the limitation of Electromagnetic Shielding Concrete in general sector application, a kind of new electromagnetic shielding plastering mortar and preparation method thereof is provided, raw material sources of the present invention are extensive, cost is low, preparation and construction technology simple, without the need to main equipment, density is little, and intensity is high, globality is better, prevent plastering mortar from coming off, compared with steel fiber, the present invention's conductive flexible used filamentary material density is low, intensity is high, deadweight can be reduced, prevent from, because the excessive wall skin caused of mortar deadweight comes off, the requirement of general electron trade to electromagnet shield effect can being met.The technical solution used in the present invention is:
A kind of electromagnetic shielding plastering mortar, comprising: gelling material, aggregate, water and conductive flexible fiber, wherein each component proportion is: gelling material 820 ~ 840kg/m
3, aggregate 1650 ~ 1700kg/m
3, water 370 ~ 380kg/m
3, conductive flexible fiber volume fraction is 0.5 ~ 1.5%.
Described gelling material is ordinary Portland cement, and its strength grade is C42.5.
Described aggregate is common buildings medium coarse sand, its fineness modulus >=3, its medium sand grating is: 4.75mm accumulation screen over-size 0,2.36mm accumulation screen over-size 2% ~ 12%, 1.18mm accumulation screen over-size 28% ~ 38%, 0.6mm accumulation screen over-size 62% ~ 72%, 0.3mm accumulation screen over-size is 82% ~ 92%, 0.15mm accumulation screen over-size is 100%.
Described conductive flexible fiber is that the fragmentation of nickel plating cloth forms, and its density is 2.3g/cm
3, after broken, length is 10mm, and wide is 1mm.Conductive flexible fiber can reduce mortar resistance value, strengthens conductive effect, and between fiber and gelling material, frictional coefficient is comparatively large, and mortar globality strengthens, and mechanical property strengthens, and after can preventing general sand finish, wall skin comes off.
Preferably, a kind of electromagnetic shielding plastering mortar, comprises 833.3kg/m
3gelling material, 1666.7kg/m
3aggregate, 375kg/m
3water and volume fraction be 0.5% conductive flexible fiber.
Preferably, a kind of electromagnetic shielding plastering mortar, comprises 829kg/m
3gelling material, 1659kg/m
3aggregate, 374kg/m
3water and volume fraction be 1% conductive flexible fiber.
A preparation method for electromagnetic shielding plastering mortar, comprises the following steps:
(1) first aggregate was mixed before mix;
(2) water is added stirrer, then add gelling material, stirring at low speed, before adding water, should first with water, stirrer be soaked;
(3) after water and gelling material Homogeneous phase mixing, mixed aggregate is evenly added, stirring at low speed 70 ~ 90s;
(4) conductive flexible fiber is added from surrounding equably during stirring at low speed 60s in step (3), in order to prevent, the condensation of conductive flexible fiber is agglomerating should carry out high-speed stirring, the high-speed stirring time is 60 ~ 120s, stirs after stopping and taking the dish out of the pot, obtain electromagnetic shielding plastering mortar.
In described step (2), the stirring at low speed time is 40 ~ 60s, and the rotation rotating speed of stirrer is 140 ± 5r/min; Revolution rotating speed is 62 ± 5r/min.
In described step (3): during stirring at low speed, the rotation rotating speed of stirrer is 140 ± 5r/min; Revolution rotating speed is 62 ± 5r/min.
When described step (4) high speed stirs, the rotating speed of stirrer is 285 ± 10r/min; Revolution rotating speed is 125 ± 10r/min.
The invention has the beneficial effects as follows:
1. invention describes a kind of electromagnetic shielding plastering mortar preparation method, when the electromagnetic shielding for general industry, compared with shielding concrete technology, only need construct according to sand finish technique at metope, without the need to concrete one-piece casting, material usage can be greatly reduced.Compared with steel fiber, the present invention's conductive flexible used filamentary material density is low, and intensity is high, can reduce deadweight, prevents because the excessive wall skin caused of mortar deadweight comes off.
2. invention describes a kind of electromagnetic shielding plastering mortar preparation method, compared with existing shielding concrete technology, the present invention in construction process without the need to heavy construction equipments such as pump trucks, only need stirrer mix at the scene, operated according to sand finish technique by workmen, greatly can improve operating efficiency.
3. invention describes a kind of electromagnetic shielding plastering mortar preparation method, compared with existing shielding concrete technology, raw material types of the present invention is less, and raw material sources is extensive, and proportioning is simple, and use range is wider.
4. invention describes a kind of electromagnetic shielding plastering mortar preparation method, compared with common plastering mortar, the conductive flexible fiber surface that the present invention mixes is coarse, better with gelling material adhesive property, and mortar bulk strength improves, and not easily comes off.
Embodiment
Embodiment 1
A kind of electromagnetic shielding plastering mortar, wherein ordinary Portland cement is consumption 837kg/m
3, common buildings medium coarse sand consumption is 1675kg/m
3, water consumption is 376kg/m
3, the volume fraction of conductive flexible fiber is 0%.
First mixed by sand before mix, water is added stirrer, then add cement, stirring at low speed 60s, the rotation rotating speed of stirrer is 140 ± 5r/min, and revolution rotating speed is 62 ± 5r/min, before adding water, should first be soaked by stirrer with water.After water and cement Homogeneous phase mixing, evenly add mixed sand, first stirring at low speed 90s, during stirring at low speed, the rotation rotating speed of stirrer is 140 ± 5r/min, and revolution rotating speed is 62 ± 5r/min, adds conductive flexible fiber uniformly when the 60s of stirring at low speed from surrounding, in order to prevent, the condensation of conductive flexible fiber is agglomerating should carry out high-speed stirring, the rotating speed of stirrer is 285 ± 10r/min, and revolution rotating speed is 125 ± 10r/min, and the time is 60s.Then take the dish out of the pot, wipe one's face according to sand finish technique, thickness of wiping one's face is 2cm.
Embodiment 2
A kind of electromagnetic shielding plastering mortar preparation method, wherein ordinary Portland cement consumption is 833.3kg/m
3, common buildings medium coarse sand consumption is 1666.7kg/m
3, water consumption is 375kg/m
3, the volume fraction of conductive flexible fiber is 0.5%.
First mixed by sand before mix, water is added stirrer, then add cement, stirring at low speed 60s, the rotation rotating speed of stirrer is 140 ± 5r/min, and revolution rotating speed is 62 ± 5r/min, before adding water, should first be soaked by stirrer with water.After water and cement Homogeneous phase mixing, evenly add mixed sand, first stirring at low speed 90s, the rotation rotating speed of stirrer is 140 ± 5r/min, and revolution rotating speed is 62 ± 5r/min, adds conductive flexible fiber uniformly when the 60s of stirring at low speed from surrounding, in order to prevent, the condensation of conductive flexible fiber is agglomerating should carry out high-speed stirring, the rotating speed of stirrer is 285 ± 10r/min, and revolution rotating speed is 125 ± 10r/min, and the time is 100s.Then take the dish out of the pot, wipe one's face according to sand finish technique, thickness of wiping one's face is 2cm.
Embodiment 3
A kind of electromagnetic shielding plastering mortar preparation method, wherein ordinary Portland cement consumption is 829kg/m
3, common buildings medium coarse sand consumption is 1659kg/m
3, water consumption is 374kg/m
3, the volume fraction of conductive flexible fiber is 1%.
First mixed by sand before mix, water is added stirrer, then add cement, stirring at low speed 60s, the rotation rotating speed of stirrer is 140 ± 5r/min, and revolution rotating speed is 62 ± 5r/min, before adding water, should first be soaked by stirrer with water.After water and cement Homogeneous phase mixing, evenly add mixed sand, first stirring at low speed 90s, the rotation rotating speed of stirrer is 140 ± 5r/min, and revolution rotating speed is 62 ± 5r/min, adds conductive flexible fiber uniformly when the 60s of stirring at low speed from surrounding, in order to prevent, the condensation of conductive flexible fiber is agglomerating should carry out high-speed stirring, the rotating speed of stirrer is 285 ± 10r/min, and revolution rotating speed is 125 ± 10r/min, and the time is 110s.Then take the dish out of the pot, wipe one's face according to sand finish technique, thickness of wiping one's face is 2cm.
Embodiment 4
A kind of electromagnetic shielding plastering mortar preparation method, wherein ordinary Portland cement consumption is 825kg/m
3, common buildings medium coarse sand consumption is 1651kg/m
3, water consumption is 373kg/m
3, the volume fraction of conductive flexible fiber is 1.5%.
First mixed by sand before mix, water is added stirrer, then add cement, stirring at low speed 60s, the rotation rotating speed of stirrer is 140 ± 5r/min, and revolution rotating speed is 62 ± 5r/min, before adding water, should first be soaked by stirrer with water.After water and cement Homogeneous phase mixing, evenly add mixed sand, first stirring at low speed 90s, the rotation rotating speed of stirrer is 140 ± 5r/min, and revolution rotating speed is 62 ± 5r/min, adds conductive flexible fiber uniformly when the 60s of stirring at low speed from surrounding, in order to prevent, the condensation of conductive flexible fiber is agglomerating should carry out high-speed stirring, the rotating speed of stirrer is 285 ± 10r/min, and revolution rotating speed is 125 ± 10r/min, and the time is 120s.Then take the dish out of the pot, wipe one's face according to sand finish technique, thickness of wiping one's face is 2cm.
Embodiment 5
A kind of electromagnetic shielding plastering mortar preparation method, wherein ordinary Portland cement consumption is 829kg/m
3, common buildings medium coarse sand consumption is 1659kg/m
3, water consumption is 374kg/m
3, the volume fraction of conductive flexible fiber is 1%.
First mixed by sand before mix, water is added stirrer, then add cement, stirring at low speed 60s, the rotation rotating speed of stirrer is 140 ± 5r/min, and revolution rotating speed is 62 ± 5r/min, before adding water, should first be soaked by stirrer with water.After water and cement Homogeneous phase mixing, evenly add mixed sand, first stirring at low speed 90s, the rotation rotating speed of stirrer is 140 ± 5r/min, and revolution rotating speed is 62 ± 5r/min, adds conductive flexible fiber uniformly when the 60s of stirring at low speed from surrounding, in order to prevent, the condensation of conductive flexible fiber is agglomerating should carry out high-speed stirring, the rotating speed of stirrer is 285 ± 10r/min, and revolution rotating speed is 125 ± 10r/min, and the time is 120s.Then take the dish out of the pot, wipe one's face according to sand finish technique, thickness of wiping one's face is 3cm.
Strength test results:
Measure ultimate compression strength and the folding strength of plastering mortar in embodiment 1-5 respectively, in table 1.
The ultimate compression strength of plastering mortar and folding strength in table 1 embodiment 1-5
Measure shield effectiveness:
Measure respectively plastering mortar in embodiment 1-5 wipe one's face after shield effectiveness, see the following form 2.
In table 2 embodiment 1-5 plastering mortar wipe one's face after shield effectiveness
From table 1 and 2, compared with ordinary mortar, use plastering mortar ultimate compression strength of the present invention and folding strength better, the conductive flexible fiber surface mixed is coarse, better with gelling material adhesive property, mortar bulk strength improves, the present invention after wiping one's face that not easily comes off can be good at improving effectiveness, electromagnetic frequency is when 0.3MHz ~ 100MHz, volume fraction be 0.5% conductive flexible fibers content shielding mortar shield effectiveness best, when electromagnetic frequency is at 100MHz ~ 300MHz, volume fraction is the conductive flexible fibers content of 1%, thickness of wiping one's face is that 3cm shielding mortar shield effectiveness is best.
Claims (10)
1. an electromagnetic shielding plastering mortar, is characterized in that, comprising: gelling material, aggregate, water, conductive flexible fiber, and wherein each component proportion is: gelling material 820 ~ 840kg/m
3, aggregate 1650 ~ 1700kg/m
3, water 370 ~ 380 kg/m
3, conductive flexible fiber volume fraction is 0.5 ~ 1.5%.
2. electromagnetic shielding plastering mortar as claimed in claim 1, is characterized in that: comprise 833.3kg/m
3gelling material, 1666.7kg/m
3aggregate, 375kg/m
3water and volume fraction be 0.5% conductive flexible fiber.
3. electromagnetic shielding plastering mortar as claimed in claim 1, is characterized in that: comprise 829kg/m
3gelling material, 1659kg/m
3aggregate, 374kg/m
3water and volume fraction be 1% conductive flexible fiber.
4. according to the electromagnetic shielding plastering mortar in claim 1, it is characterized in that, described gelling material is ordinary Portland cement, and its strength grade is C42.5.
5. according to the electromagnetic shielding plastering mortar in claim 1, it is characterized in that, described aggregate is common buildings medium coarse sand, its fineness modulus >=3, its medium sand grating is: 4.75mm accumulation screen over-size 0,2.36mm accumulation screen over-size 2% ~ 12%, 1.18mm accumulation screen over-size 28% ~ 38%, 0.6mm accumulation screen over-size 62% ~ 72%, 0.3mm accumulation screen over-size is 82% ~ 92%, 0.15mm accumulation screen over-size is 100%.
6. according to the electromagnetic shielding plastering mortar in claim 1, it is characterized in that, described conductive flexible fiber is that the fragmentation of nickel plating cloth forms, and its density is 2.3g/cm
3, after broken, length is 10mm, and wide is 1mm.
7. as the preparation method of the electromagnetic shielding plastering mortar in claim 1, it is characterized in that, comprise the following steps: aggregate first mixed by (1) before mix;
(2) water is added stirrer, then add gelling material, stirring at low speed, before adding water, should first with water, stirrer be soaked;
(3) after water and gelling material Homogeneous phase mixing, mixed aggregate is evenly added, stirring at low speed 70 ~ 90s; (4) conductive flexible fiber is added from surrounding uniformly when the 60s of the middle stirring at low speed of described step (3), in order to prevent, the condensation of conductive flexible fiber is agglomerating carries out high-speed stirring, the high-speed stirring time is 60 ~ 120s, stirs after stopping and taking the dish out of the pot, obtain electromagnetic shielding plastering mortar.
8. the preparation method of electromagnetic shielding plastering mortar according to claim 7, is characterized in that, in described step (2), the stirring at low speed time is 40 ~ 60s, and the rotation rotating speed of stirrer is 140 ± 5r/min, and revolution rotating speed is 62 ± 5 r/min.
9. the preparation method of electromagnetic shielding plastering mortar according to claim 7, is characterized in that, in described step (3), during stirring at low speed, the rotating speed of stirrer is 140 ± 5r/min; Revolution rotating speed is 62 ± 5 r/min.
10. the preparation method of electromagnetic shielding plastering mortar according to claim 7, is characterized in that, when described step (4) high speed stirs, the rotating speed of stirrer is 285 ± 10r/min; Revolution rotating speed is 125 ± 10 r/min.
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| CN106102432A (en) * | 2016-08-01 | 2016-11-09 | 江苏工程职业技术学院 | The method of mobile screened room pre-control building intelligence system electromagnetism Leibo interference |
| CN106278009A (en) * | 2016-07-22 | 2017-01-04 | 葛加君 | The method using the pre-control electromagnetism Leibo interference of conductive shield concrete |
| CN106380139A (en) * | 2016-08-28 | 2017-02-08 | 长屏(北京)电磁防护技术有限公司 | Radar wave protection cement mortar |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106278009A (en) * | 2016-07-22 | 2017-01-04 | 葛加君 | The method using the pre-control electromagnetism Leibo interference of conductive shield concrete |
| CN106278009B (en) * | 2016-07-22 | 2018-05-04 | 葛加君 | The method disturbed using the pre-control electromagnetism Leibo of conductive shield concrete |
| CN106102432A (en) * | 2016-08-01 | 2016-11-09 | 江苏工程职业技术学院 | The method of mobile screened room pre-control building intelligence system electromagnetism Leibo interference |
| CN106380139A (en) * | 2016-08-28 | 2017-02-08 | 长屏(北京)电磁防护技术有限公司 | Radar wave protection cement mortar |
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