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CN-122010499-A - High-interfacial-activity high-strength electromagnetic shielding thin cement-spraying material and preparation method thereof

CN122010499ACN 122010499 ACN122010499 ACN 122010499ACN-122010499-A

Abstract

The invention discloses a high-interfacial-activity high-strength electromagnetic shielding thin cement-spraying material and a preparation method thereof. The material comprises 15-45 parts by weight of cement, 8-15 parts by weight of aqueous epoxy resin, 8-15 parts by weight of epoxy resin curing agent, 15-30 parts by weight of aqueous styrene-acrylic ester emulsion, 15-45 parts by weight of heavy calcium carbonate, 5-15 parts by weight of quartz powder, 5-10 parts by weight of titanium dioxide, 2-8 parts by weight of attapulgite, 1-5 parts by weight of calcium carbonate whisker, 0.5-2 parts by weight of coupling agent, 5-10 parts by weight of mixing water, 0.1-0.3 part by weight of water reducer and 1-5 parts by weight of core-shell type four-needle zinc oxide whisker. The invention can realize the cooperative promotion of the interfacial activity, the crack resistance, the strength and the spraying property of the thin cement-sprayed material, and endow the material with the electromagnetic shielding property required when the material is used in special scenes such as intelligent buildings and the like.

Inventors

  • LU LINGCHAO
  • MA KAI
  • GAN XINGYU
  • LI LAIBO
  • LI JIALE

Assignees

  • 济南大学

Dates

Publication Date
20260512
Application Date
20260228

Claims (10)

  1. 1. The high-interfacial-activity high-strength electromagnetic shielding thin cement spraying material is characterized by comprising the following components, by weight, 15-45 parts of cement, 8-15 parts of aqueous epoxy resin, 8-15 parts of an epoxy resin curing agent, 15-30 parts of aqueous styrene-acrylate emulsion, 15-45 parts of heavy calcium carbonate, 5-15 parts of quartz powder, 5-10 parts of titanium dioxide, 2-8 parts of attapulgite, 1-5 parts of calcium carbonate whisker, 0.5-2 parts of a coupling agent, 5-10 parts of mixing water, 0.1-0.3 part of a water reducing agent, 0.4-1.2 parts of a defoaming agent, 0.3-0.6 part of a dispersing agent, 0.1-0.5 part of a wetting agent, 0.1-0.5 part of a leveling agent and 1-5 parts of a core-shell type four-needle zinc oxide whisker, wherein the high-interfacial-strength electromagnetic shielding thin cement spraying material is prepared by the following steps: (1) Dispersing zinc powder, ferric nitrate powder, graphite powder and absolute ethyl alcohol into a dispersion liquid, and drying to obtain mixed powder A; (2) Calcining the mixed powder A, cooling to room temperature, cleaning, drying, uniformly mixing the obtained powder B with acetic acid solution, standing, separating out a solid product, and washing to obtain neutral powder C; (3) Purifying the neutral powder C under a heating condition, and cooling to room temperature after the purification to obtain powder D; (4) Dispersing the powder D and dopamine in water, regulating the system to be alkaline, and then carrying out stirring reaction; (5) Dispersing the powder E and Co 2+ sources in anhydrous methanol, adding the obtained mixture F into a solution G formed by dissolving 2-methylimidazole in the anhydrous methanol for ultrasonic treatment, washing the obtained mixture H, and drying to obtain the core-shell type four-needle zinc oxide whisker.
  2. 2. The high-interfacial-activity high-strength electromagnetic shielding thin cement-spraying material according to claim 1, wherein in the step (1), the ratio of zinc powder, ferric nitrate powder, graphite powder and absolute ethyl alcohol is 20-40 parts by weight, 0.3-1.5 parts by weight, 0.5-6 parts by weight and 100-150 mL.
  3. 3. The high-interfacial-activity high-strength electromagnetic shielding thin cement-spraying material according to claim 1, wherein in the step (2), the calcining temperature is 920-1000 ℃ and the calcining time is 15-30 min; Optionally, in the step (2), the temperature of the drying is 40-60 ℃ and the time is 18-24 hours; Optionally, in the step (2), the mass ratio of the powder B to the acetic acid solution is 1:10-20; Optionally, in step (2), the pH of the acetic acid solution=3 to 4.
  4. 4. The high-interfacial-activity high-strength electromagnetic shielding thin cement-spraying material according to claim 1, wherein in the step (3), the heating temperature is 200-350 ℃ and the heat preservation time is 1-2 hours.
  5. 5. The high-interfacial-activity high-strength electromagnetic shielding thin cement-spraying material according to claim 1, wherein in the step (4), the mass ratio of the powder D to the dopamine to the water is 3-10:0.2-1.0:80-150; Optionally, in the step (4), the pH of the system is adjusted to 8.4-8.6 by using a buffer solution; optionally, the buffer solution comprises any one of a tris hydrochloride buffer solution, a borate buffer solution, a phosphate buffer solution and a carbonate buffer solution; optionally, in the step (4), the stirring reaction time is 6-24 hours.
  6. 6. The high-interfacial-activity high-strength electromagnetic shielding thin cement-spraying material according to claim 1, wherein in the step (5), the mass ratio of the powder E, co 2+ source to the anhydrous methanol is 4-6:2-6:200-300; optionally, in the step (5), the Co 2+ source comprises at least one of cobalt nitrate, cobalt acetate, cobalt chloride and cobalt sulfate.
  7. 7. The high-interfacial-activity high-strength electromagnetic shielding thin cement-spraying material according to claim 1, wherein in the step (5), the mass ratio of the mixture F to the solution G is 1:0.8-1; Optionally, in the step (5), the solution G consists of 2.2-6.7 parts by weight of 2-methylimidazole and 200-300 parts by weight of anhydrous methanol; Optionally, in the step (5), the time of the ultrasonic treatment is 5-15 min.
  8. 8. The high-interfacial-activity high-strength electromagnetic shielding thin cement paste material according to any one of claims 1 to 7, wherein the solid content of the aqueous epoxy resin is 45-55%; Optionally, the solid content of the epoxy curing agent is 35-45%; Optionally, the solid content of the aqueous styrene-acrylate emulsion is 50-60%.
  9. 9. The high interfacial activity high strength electromagnetic shielding thin cement spray material according to any one of claims 1 to 7, wherein the epoxy hardener comprises at least one of an aqueous aliphatic polyamine hardener, a cardanol modified amine hardener; Optionally, the coupling agent comprises at least one of KH-550, KH-560, KH-570, KH-792; optionally, the water reducer comprises at least one of a polycarboxylate water reducer, a naphthalene water reducer and a lignosulfonate water reducer.
  10. 10. The method for preparing the high-interfacial-activity high-strength electromagnetic shielding thin cement for spraying water according to any one of claims 1 to 9, which is characterized by comprising the following steps: (1) Uniformly mixing the cement, heavy calcium, quartz powder, titanium dioxide, attapulgite, calcium carbonate whisker and a water reducing agent to obtain mixed powder for later use; (2) Uniformly mixing the coupling agent and the mixing water, and regulating the mixture to be alkaline to obtain a hydrolysis solution for later use; (3) Uniformly mixing the aqueous epoxy resin and the aqueous styrene-acrylic ester emulsion, and then adding the core-shell type four-needle zinc oxide whisker, and uniformly mixing to obtain a liquid system I for later use; (4) Mixing the hydrolysis solution with a liquid system I uniformly, adding the aqueous epoxy curing agent, and mixing uniformly to obtain a liquid system II; optionally, in the step (2), the alkalinity means ph=8.0 to 8.2; Alternatively, the pH is adjusted using any one of sodium bicarbonate and aqueous ammonia.

Description

High-interfacial-activity high-strength electromagnetic shielding thin cement-spraying material and preparation method thereof Technical Field The invention relates to the technical field of concrete materials, in particular to a high-interfacial-activity high-strength electromagnetic shielding thin cement-spraying material and a preparation method thereof. Background The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art. The marine cement concrete has the advantages of high compressive strength, convenient construction, low cost and the like, and is widely applied to the construction of ocean engineering infrastructures such as ports, wharfs, cross-sea bridges and the like. However, as a porous heterogeneous multiphase material, the marine cement concrete is difficult to prevent harmful ions such as chloride ions, sulfate ions and the like existing in the marine environment from corroding to the inside, so that the steel bars are corroded, expanded and the marine cement concrete is cracked, and the safety and stability of the marine cement concrete structure are obviously reduced. The protective coating is coated on the surface of the marine cement concrete, so that the marine cement concrete can effectively block harmful ion erosion, and is an effective measure for prolonging the service life of the marine cement concrete. The organic coating has good flexibility, but has poor environmental protection, durability, interface compatibility and the like. The inorganic coating formed by the cement material has the defects of high brittleness, easy cracking, low bonding strength and the like although the inorganic coating has good ageing resistance and environmental protection. The thin cement-spraying material with the thickness of 5-10 mm can obviously reduce the exposure risk of a matrix as a novel organic-inorganic composite protective coating material, but has the defects of low interfacial activity, easiness in cracking, swelling and peeling, low tensile strength, poor sagging resistance in spraying construction and the like. In addition, the conventional thin cement-spraying material has the problem that the additional requirement of special scenes such as intelligent buildings on electromagnetic protection is difficult to meet. Disclosure of Invention The invention provides a high-interfacial-activity high-strength electromagnetic shielding thin cement spraying material and a preparation method thereof, which can realize the cooperative promotion of the interfacial activity, crack resistance, strength and spraying property of the thin cement spraying material, endow the material with electromagnetic shielding characteristics required when the material is used in special scenes such as intelligent buildings and the like, and finally realize the integrated promotion of protection, reinforcement and electromagnetic shielding of a marine cement concrete structure. Specifically, the technical aspects of the present invention are as follows. Firstly, providing a high-interfacial-activity high-strength electromagnetic shielding thin cement spraying material, which comprises the following components, by weight, 15-45 parts of cement, 8-15 parts of aqueous epoxy resin, 8-15 parts of an epoxy resin curing agent, 15-30 parts of aqueous styrene-acrylate emulsion, 15-45 parts of heavy calcium carbonate, 5-15 parts of quartz powder, 5-10 parts of titanium dioxide, 2-8 parts of attapulgite, 1-5 parts of calcium carbonate whisker, 0.5-2 parts of a coupling agent, 5-10 parts of mixing water, 0.1-0.3 part of a water reducing agent and 1-5 parts of core-shell type four-needle zinc oxide whisker, wherein the whisker is prepared by the following method: (1) And (3) dispersing zinc powder, ferric nitrate powder, graphite powder and absolute ethyl alcohol to form a dispersion liquid, and drying to obtain mixed powder A. (2) And (3) calcining the mixed powder A, cooling to room temperature, cleaning, drying, uniformly mixing the obtained powder B with acetic acid solution, standing, separating out a solid product, and washing to obtain neutral powder C. (3) And (3) purifying the neutral powder C under the heating condition, and cooling to room temperature after the purification to obtain powder D. (4) Dispersing the powder D and dopamine in water, and then adjusting the system to be alkaline, and then carrying out stirring reaction. After completion, the solid product is separated, washed and dried to obtain powder E. (5) Dispersing the powder E and Co 2+ sources in anhydrous methanol, adding the obtained mixture F into a solution G formed by dissolving 2-methylimidazole in the anhydrous methanol for ultrasonic treatment, washing the obtained mixture H, and drying to obtain the