CN101186474A - Cement-based composite wave-absorbing material doped with nano titanium oxide and preparation method thereof - Google Patents

Cement-based composite wave-absorbing material doped with nano titanium oxide and preparation method thereof Download PDF

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Publication number
CN101186474A
CN101186474A CNA2007100099943A CN200710009994A CN101186474A CN 101186474 A CN101186474 A CN 101186474A CN A2007100099943 A CNA2007100099943 A CN A2007100099943A CN 200710009994 A CN200710009994 A CN 200710009994A CN 101186474 A CN101186474 A CN 101186474A
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China
Prior art keywords
cement
titanium oxide
nano
water
composite wave
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CNA2007100099943A
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Chinese (zh)
Inventor
熊国宣
邓敏
徐玲玲
李澎
黄小明
唐明述
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Nanjing Tech University
East China Institute of Technology
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Nanjing Tech University
East China Institute of Technology
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Priority to CNA2007100099943A priority Critical patent/CN101186474A/en
Publication of CN101186474A publication Critical patent/CN101186474A/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00241Physical properties of the materials not provided for elsewhere in C04B2111/00
    • C04B2111/00258Electromagnetic wave absorbing or shielding materials

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

The composite wave-absorbing material consists of nano titanium oxide, dispersant, silicate cement and water, and the dispersing system includes sodium hexametaphosphate as dispersant and water in the weight ratio of 0.3-0.7 wt% and the water/dry material ratio of 0.32-0.38. The preparation steps are as follows: a. preparing suspension of nano titanium oxide by ultrasonic waves, and b, preparing the cement-based composite wave-absorbing material doped with the nano titanium oxide. According to the invention, a small amount of nano titanium oxide wave absorbing agent is added into the traditional cement material, so that the cement-based composite material has good wave absorbing performance and mechanical property, the economic cost is not increased much, and the preparation process is simple and feasible.

Description

Nano titanium oxide doped cement-base composite wave-absorbing material and preparation method
Technical field
The invention belongs to building function material technology field.
Background technology
Cement-base composite wave-absorbing material is to mix wave absorbing agent and have a class type material that absorbs the hertzian wave function in cement or concrete.Aspect civilian, it promptly can be used for shielding electromagnetic wave to the radiation of human body, reaches the purpose that purifies the hertzian wave contaminate environment; Can also be used to preventing the data leak of computer center, play privacy functions.Militarily, cement-base composite wave-absorbing material can play and disturb the radar detection target, weaken echoed signal, makes radar detect fixed ground target or detection accuracy obviously reduces, and avoids enemy's military attack.The cement based absorbing material that is used for civil building reaches electromagnetic reflectivity and just has actual use value more than the 5dB, and the cement based absorbing material that is used for the ground military target surpasses 7dB to the reflectivity of radar wave and also possesses the engineering using value.
The Electromagnetically shielding cement concrete abroad just begins one's study at the beginning of the nineties in last century, wherein studied thin carbon filament, steel paper clip, gluey graphite, coke powder and Stainless Steel Fibre have been mixed the cement-base composite material of making in the cement respectively with the scientific research group headed by the D.D.L.Chung, this cement-base composite material generally can reach about 40dB with interior effectiveness of shielding at 1.5GHz, but reflection loss has only 2-4dB.Domestic in recent years some scholar has also carried out the research work of this respect, studied the sand-cement slurry of mixing steel fiber as people such as Yang Haiyan, in the 2-18GHz range of frequency, the specific absorption of this sand-cement slurry sample is that the bandwidth of 4dB can reach 15.28GHz, and maximum absorbance is 9.8dB; People such as Zhao Yanbo have studied the cement based porous composite wave-suction material that is mixed with expansion type polystyrene (EPS), when the filling ratio (volume fraction) of EPS be 60%, when thickness of sample is 20mm, reflectivity reaches 6GHz less than the bandwidth of-10dB, reaches-15.27dB at the 18GHz minimum reflectance; People such as Xu Weidong have studied the ferrite wave absorbing agent and have been incorporated into absorbing property in the sand-cement slurry, when the ferrite volume be 33% (massfraction), when thickness is 3mm, in the 8-12GHz frequency range, the about 7dB of maximum reflectivity, minimum reflectance reach 15dB, illustrate that ferrite is incorporated into the absorbing property that can improve material in the sand-cement slurry.
The wave frequency that the cement based shielding material of above-mentioned research is shielded nearly all at tens Hz in 1-2GHz, these cement based shielding materials are mainly used in leakage and the outside electromagnetic interference that prevents electromagnetic signal, it is better to the shielding electromagnetic waves effect, but relatively poor to absorption of electromagnetic wave decay and reflection loss; And the absorbing property of the cement based absorbing material of being studied is undesirable, and the mechanical property that is mixed with the cement-base composite material of ferrite wave absorbing agent all has to some extent and reduce, and has influence on practical application.
Summary of the invention
Problem at above-mentioned existence, the objective of the invention is with nano-titanium oxide as wave absorbing agent, make nano-titanium oxide form uniform suspension by ultrasonic dispersing, under mechanical stirring, make the suspension of nano-titanium oxide and cement mixing even then, make cement-base composite wave-absorbing material through vibratory compaction, maintenance.
The present invention and concrete technical scheme are as follows:
Adopt ultrasonic dispersing technology and mechanical stirring method to make nano titanium oxide doped cement-base composite wave-absorbing material.Its composition characteristic is: this composite wave-suction material is made up of nano-titanium oxide, dispersion agent, silicate cement and water, dry material is nano-titanium oxide and silicate cement, and the weight percent that nano-titanium oxide accounts for dry material is that the weight percent that 3%-7%, cement account for dry material is 93%-97%.Dispersion system comprises sodium hexametaphosphate dispersant and water, the mass percent that sodium hexametaphosphate dispersant accounts for dispersion system weight be 0.3%-0.7%, water and dry material ratio just water cement ratio between 0.32-0.38.
The processing parameter of the preparation process of this composite wave-suction material and necessity is as follows:
1, ultrasonic wave prepares the suspension of nano-titanium oxide,
Take by weighing a certain amount of Sodium hexametaphosphate 99 dispersion agent, mass percent by the dispersion system weight of 0.3%-0.7%, be dissolved in a certain amount of water, the concentration that keeps dispersion system is between 7.0%-10%, take by weighing the nano-titanium oxide of 3%-7% again, pour in the above-mentioned solution, place the ultrasonic dispersing instrument, ultra-sonic dispersion 20-30 minute, make uniform nano-titanium oxide suspension.
2, the preparation method of nano titanium oxide doped cement-base composite wave-absorbing material
Take by weighing 42.5 of 93%-97% #Or 32.5 #, 52.5 #Silicate cement and a certain amount of water, the ratio that makes water and dry material are that water cement ratio remains between the 0.32-0.38; Place cement stirring to irritate, start stirring, the suspension and the water that slowly add nano-titanium oxide, stir and after 3-5 minute compound is poured in the punching block, place on the shaking table vibration 1-2 minute then, floating surface is maintenance 1 day under the condition of 85-90% in 20 ℃-25 ℃ of temperature, humidity, continue maintenance under these conditions after the form removal 28 days, and made nano titanium oxide doped cement-base composite wave-absorbing material.
The present invention mixes a spot of nano-titanium oxide wave absorbing agent in the traditional water mud material, make cement-base composite material have absorbing property and mechanical property preferably, and its Financial cost increases few, preparation technology's simple possible.The reflectivity of this cement-base composite wave-absorbing material in the 8-26.5GHz range of frequency is basically less than 7dB, and minimum reflectance reaches 17.37dB, and reflectivity reaches 11GHz less than the continuous bandwidth of 10dB.Show that this cement-base composite wave-absorbing material has compatible preferably absorbing property in X (8-12.5GHz), KU (12.5-18GHz) and three wave bands of K (18-26.5GHz), realized wideband suction ripple effect; Simultaneously its mechanical property is compared with cement paste and has been improved 12.6% and 19.1%, mechanical property be improved significantly.
Description of drawings
The reflectance test figure of Fig. 1 embodiment sample;
The Mechanics Performance Testing figure of Fig. 2 embodiment sample.
Specific embodiment
Example 1:
1, ultrasonic wave prepares the suspension of nano-titanium oxide,
Take by weighing the mass percent of a certain amount of Sodium hexametaphosphate 99 dispersion agent by 0.5% dispersion system weight, be dissolved in a certain amount of water, the concentration that keeps dispersion system is 9.0%, take by weighing 5% nano-titanium oxide again, pour in the above-mentioned solution, placing ultrasonic power is that 150W, ultrasonic frequency are the ultrasonic dispersing instrument of 40KHz, and ultra-sonic dispersion 25 minutes makes uniform nano-titanium oxide suspension.
2, the preparation method of nano titanium oxide doped cement-base composite wave-absorbing material
Take by weighing 95% 42.5 #Silicate cement and a certain amount of water, the ratio that makes water and dry material are that water cement ratio remains between 0.35; Place cement stirring to irritate, start stirring, the suspension and the water that slowly add nano-titanium oxide, stirring and after 3 minutes compound being poured into the cross section is that 180mm * 180mm, thickness are in the punching block of 5-30mm, place on the shaking table vibration 1 minute then, floating surface is maintenance 1 day under 90% the condition in 20 ℃ of temperature, humidity, continue maintenance under these conditions after the form removal 28 days, and made nano titanium oxide doped cement-base composite wave-absorbing material.
3. anti-folding of its reflectivity in the 8=26.5GHz range of frequency of the sample testing behind the maintenance 28d and its and ultimate compression strength, the results are shown in Figure 1 and Fig. 2.
The reflectivity of sample as can be seen from Fig. 1: the reflectivity of cement paste sample is all more than 6dB, and the reflectivity of nano titanium oxide doped cement-base composite wave-absorbing material is basically below 7dB, wherein reflectivity covers 13-24GHz less than the continuous bandwidth of 10dB, minimum reflectance appears at the 16.2GHz place, its value reaches 17.37dB, embodies wideband absorbing property preferably.
By the mechanical property of sample among Fig. 2 as can be known: the anti-folding of sample and ultimate compression strength have in various degree raising than cement paste respectively behind the maintenance 28d.

Claims (2)

1. nano titanium oxide doped cement-base composite wave-absorbing material, its composition characteristic is: this composite wave-suction material is made up of nano-titanium oxide, dispersion agent, silicate cement and water, dry material is nano-titanium oxide and silicate cement, and the weight percent that nano-titanium oxide accounts for dry material is that the weight percent that 3%-7%, cement account for dry material is 93%-97%.Dispersion system comprises sodium hexametaphosphate dispersant and water, the mass percent that sodium hexametaphosphate dispersant accounts for dispersion system weight be 0.3%-0.7%, water and dry material ratio just water cement ratio between 0.32-0.38.
2. the preparation method of a nano titanium oxide doped cement-base composite wave-absorbing material is characterized in that, the preparation process and the processing parameter of this composite wave-suction material are as follows:
A, ultrasonic wave prepare the suspension of nano-titanium oxide,
Take by weighing a certain amount of Sodium hexametaphosphate 99 dispersion agent, mass percent by the dispersion system weight of 0.3%-0.7%, be dissolved in a certain amount of water, the concentration that keeps dispersion system is between 7.0%-10%, take by weighing the nano-titanium oxide of 3%-7% again, pour in the above-mentioned solution, place the ultrasonic dispersing instrument, ultra-sonic dispersion 20-30 minute, make uniform nano-titanium oxide suspension.
The preparation method of b, nano titanium oxide doped cement-base composite wave-absorbing material
Take by weighing 42.5 of 93%-97% #Or 32.5 #, 52.5 #Silicate cement and a certain amount of water, the ratio that makes water and dry material are that water cement ratio remains between the 0.32-0.38; Place cement stirring to irritate, start stirring, the suspension and the water that add nano-titanium oxide, stir and after 3-5 minute compound is poured in the punching block, place on the shaking table vibration 1-2 minute then, floating surface is maintenance 1 day under the condition of 85-90% in 20 ℃-25 ℃ of temperature, humidity, continue maintenance under these conditions after the form removal 28 days, and made nano titanium oxide doped cement-base composite wave-absorbing material.
CNA2007100099943A 2007-12-07 2007-12-07 Cement-based composite wave-absorbing material doped with nano titanium oxide and preparation method thereof Pending CN101186474A (en)

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102086114A (en) * 2010-11-19 2011-06-08 北京工业大学 Ferrite gypsum-based microwave-absorbing composite material and preparation method thereof
CN101767949B (en) * 2009-01-06 2012-07-04 上海罗洋新材料科技有限公司 Volume stabilizer for cement-based composite material and preparation method thereof
CN104628421A (en) * 2015-01-27 2015-05-20 济南大学 Surface wave-absorbing modification technology for cement and concrete
CN106116366A (en) * 2016-06-30 2016-11-16 大连理工大学 A kind of nano titanium oxide reinforced reactive-powder-concrete and preparation method thereof
CN106186905A (en) * 2016-06-30 2016-12-07 大连理工大学 A kind of cement-base composite material mixing bag silicon nano titanium oxide and preparation method thereof
CN106278142A (en) * 2015-06-01 2017-01-04 武汉理工大学 A kind of dielectric type function haydite as electromagnetic wave absorption concrete aggregate and preparation method thereof
CN106495617A (en) * 2016-11-10 2017-03-15 过冬 A kind of suction ripple cement structures of doping quartz
CN106517945A (en) * 2016-11-10 2017-03-22 过冬 Graphene/ferric ferrous oxide composite powder modified wave-absorbing cement
CN106517947A (en) * 2016-11-10 2017-03-22 过冬 Wave-absorbing cement structure doped with quartz and manganese dioxide
CN106517948A (en) * 2016-11-10 2017-03-22 过冬 Manganese-dioxide-modified wave-absorbing cement
CN106517946A (en) * 2016-11-10 2017-03-22 过冬 Wave-absorbing cement
CN106747044A (en) * 2016-11-10 2017-05-31 过冬 A kind of carbon black modified suction ripple cement
CN106747045A (en) * 2016-11-10 2017-05-31 过冬 A kind of suction ripple cement of quartz/manganese dioxide powder modified
CN107382148A (en) * 2017-07-04 2017-11-24 汤始建华建材(苏州)有限公司 A kind of multifunctional concrete and preparation method thereof
CN108698928A (en) * 2016-12-26 2018-10-23 李炳赫 Multifunctional composite construction material and its construction method
CN113800555A (en) * 2021-09-02 2021-12-17 重庆大学 Novel titanium sulfide nano material and preparation and wave-absorbing application of composite material thereof

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101767949B (en) * 2009-01-06 2012-07-04 上海罗洋新材料科技有限公司 Volume stabilizer for cement-based composite material and preparation method thereof
CN102086114A (en) * 2010-11-19 2011-06-08 北京工业大学 Ferrite gypsum-based microwave-absorbing composite material and preparation method thereof
CN102086114B (en) * 2010-11-19 2013-05-22 北京工业大学 Ferrite gypsum-based microwave-absorbing composite material and preparation method thereof
CN104628421A (en) * 2015-01-27 2015-05-20 济南大学 Surface wave-absorbing modification technology for cement and concrete
CN104628421B (en) * 2015-01-27 2016-09-07 济南大学 Wavefront modifier technology is inhaled on the surface of a kind of cement and concrete
CN106278142A (en) * 2015-06-01 2017-01-04 武汉理工大学 A kind of dielectric type function haydite as electromagnetic wave absorption concrete aggregate and preparation method thereof
CN106116366A (en) * 2016-06-30 2016-11-16 大连理工大学 A kind of nano titanium oxide reinforced reactive-powder-concrete and preparation method thereof
CN106186905A (en) * 2016-06-30 2016-12-07 大连理工大学 A kind of cement-base composite material mixing bag silicon nano titanium oxide and preparation method thereof
CN106116366B (en) * 2016-06-30 2018-07-13 大连理工大学 A kind of nano-titanium dioxide reinforced reactive-powder-concrete and preparation method thereof
CN106186905B (en) * 2016-06-30 2018-07-13 大连理工大学 A kind of cement-base composite material and preparation method thereof for mixing packet silicon nano-titanium dioxide
CN106517947A (en) * 2016-11-10 2017-03-22 过冬 Wave-absorbing cement structure doped with quartz and manganese dioxide
CN106517948A (en) * 2016-11-10 2017-03-22 过冬 Manganese-dioxide-modified wave-absorbing cement
CN106517946A (en) * 2016-11-10 2017-03-22 过冬 Wave-absorbing cement
CN106747044A (en) * 2016-11-10 2017-05-31 过冬 A kind of carbon black modified suction ripple cement
CN106747045A (en) * 2016-11-10 2017-05-31 过冬 A kind of suction ripple cement of quartz/manganese dioxide powder modified
CN106517945A (en) * 2016-11-10 2017-03-22 过冬 Graphene/ferric ferrous oxide composite powder modified wave-absorbing cement
CN106495617A (en) * 2016-11-10 2017-03-15 过冬 A kind of suction ripple cement structures of doping quartz
CN108698928A (en) * 2016-12-26 2018-10-23 李炳赫 Multifunctional composite construction material and its construction method
CN107382148A (en) * 2017-07-04 2017-11-24 汤始建华建材(苏州)有限公司 A kind of multifunctional concrete and preparation method thereof
CN113800555A (en) * 2021-09-02 2021-12-17 重庆大学 Novel titanium sulfide nano material and preparation and wave-absorbing application of composite material thereof

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Open date: 20080528