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A kind of graphene modified resistance reducing material and preparation method thereof
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A graphene modification and resistance-reducing material technology, applied in the field of grounding engineering materials, can solve problems such as poor graphene dispersion, and achieve the effects of improving density, easy installation, and wide applicable temperature range
Active Publication Date: 2019-03-15
CENT SOUTH UNIV +1
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[0005] The purpose of the present invention is to solve the problem of poor dispersion of graphene, use graphene dispersion technology to add graphene to the cement matrix, add conductive materials at the same time, and finally prepare a kind of cement with small resistivity, high mechanical properties, wide application range and anti-corrosion performance. Excellent resistance-reducing material with simple construction method
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Embodiment 1
[0029] Step 1: Select 3% graphene and 5% sodium cholate into water to prepare a graphene dispersion, the ratio of graphene to water is 1:25, and ultrasonically stir for 2 hours.
[0030] The second step: add 20% sodium bentonite bentonite and 1% plaster of paris to the graphene dispersion and stir for 1 hour to reach a uniform state.
[0031] The third step: mix 27% cement with 7% carbon fiber and 7% steel fiber, after mechanical stirring for 1 hour, add 25% graphite and 5% zinc powder to it and mix for 1 hour to reach a uniform state, then mix with The materials obtained in the second step were mixed and stirred for 1 hour to reach a homogeneous state.
[0032] Step 4: Pour the prepared slurry into the mold, and let it stand for 24 hours until it solidifies to obtain the graphene-modified resistance-reducing module material.
Embodiment 2
[0034] Step 1: Select 4% graphene and 3% sodium dodecylbenzene sulfonate into water to prepare a graphene dispersion. The ratio of graphene to water is 1:20, and ultrasonically stir for 2 hours.
[0035] The second step: add 20% sodium bentonite and 0.5% plaster of paris to the graphene dispersion and stir for 1 hour to reach a uniform state.
[0036] Step 3: Mix 34% cement with 5% carbon fiber and 7% steel fiber. After mechanical stirring for 1 hour, add 20% graphite and 6.5% zinc powder to it and mix for 1 hour to achieve a uniform state. Then mix with The materials obtained in the second step were mixed and stirred for 1 hour to reach a homogeneous state.
[0037] Step 4: Pour the prepared slurry into the mold, and let it stand for 24 hours until it solidifies to obtain the graphene-modified resistance-reducing module material.
Embodiment 3
[0039] The first step: select 1% graphene and 5% polyvinylpyrrolidone and pour it into water to prepare a graphene dispersion. The ratio of graphene to water is 1:30, and ultrasonically stir for 2 hours.
[0040] The second step: add 20% sodium bentonite and 1% plaster of paris to the graphene dispersion and stir for 1 hour to reach a uniform state.
[0041] The third step: mix 30% cement with 5% carbon fiber and 7% steel fiber, after mechanical stirring for 1 hour, add 24% graphite and 7% zinc powder to it and mix for 1 hour to reach a uniform state, then mix with The materials obtained in the second step were mixed and stirred for 1 hour to reach a homogeneous state.
[0042] Step 4: Pour the prepared slurry into the mold, and let it stand for 24 hours until it solidifies to obtain the graphene-modified resistance-reducing module material.
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Abstract
The invention provides a graphene modified resistance reduction material and a preparation method thereof. The graphene modified resistance reduction material comprises, by weight, 20-50 parts of cement, 20-40 parts of crystalline flake graphite, 0.01-4 parts of graphene, 1-10 parts of carbon fibers, 1-10 parts of zinc powder, 1-10 parts of dispersing agents, 1-10 parts of steel fibers, 10-30 parts of bentonite and 0.5-2 parts of calcined gypsum. The preparation method of the material includes the steps: firstly, selecting the graphene, the dispersing agents and water according to a formula toprepare graphene dispersing liquid; secondly, ultrasonically treating the graphene dispersing liquid to obtain suspension liquid containing the uniformly dispersed graphene for standby application, adding the bentonite and the calcined gypsum into the suspension liquid, and uniformly stirring mixture; thirdly, mechanically stirring and mixing the cement, the carbon fibers and the steel fibers, mixing the zinc powder and the crystalline flake graphite, adding mixture of the zinc powder and the crystalline flake graphite, and uniformly stirring and mixing mixture; combining and uniformly mixingmixed liquid. The graphene modified resistance reduction material is low in specific resistance, high in mechanical property, wide in use range, good in corrosion resistance and simple in construction mode.
Description
technical field [0001] The invention relates to a grounding resistance reducing material and a preparation method thereof, belonging to the field of grounding engineering materials. Background technique [0002] High-rise buildings are vulnerable to lightning strikes in lightning weather. As a preventive measure, grounding protection devices are usually installed. The resistance-reducing material is an engineering material used in the grounding engineering protection device to reduce the soil resistance around the grounding electrode. [0003] Early resistance-reducing materials were mainly some metal salts or metal oxides, and these substances were ionized in water to generate charged ions to increase the conductivity of the soil. This method inevitably causes corrosion to the metal grounding electrode, and the resistance-reducing effect is easily affected by soil moisture, resulting in poor long-term stability of the material. Therefore, with the development of resistance...
Claims
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