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CN-118027717-B - Alkali-resistant fire-resistant coating for building and preparation method and application thereof

CN118027717BCN 118027717 BCN118027717 BCN 118027717BCN-118027717-B

Abstract

The invention discloses an alkali-resistant fire-resistant coating for buildings and a preparation method and application thereof. The material comprises, by weight, 20-60 parts of aluminum tripolyphosphate, 20-40 parts of water glass, 10-20 parts of silicon dioxide, 5-10 parts of aluminum oxide, 1-5 parts of kaolin, 1-5 parts of zirconium oxide, 1-5 parts of anhydrous calcium sulfate, 5-40 parts of a modifier, 2-8 parts of a binder, 1-2 parts of a curing agent and 1-2 parts of a defoaming agent. The preparation method comprises the steps of blending aluminum tripolyphosphate and a modifier in a ball mill for 10-120 min to obtain modified aluminum tripolyphosphate, ball milling for 60-720min by taking alcohol and water as wet milling liquid, ball milling at the speed of 100-800r/min, taking out and drying for 36-48h, putting other raw materials and modified aluminum tripolyphosphate powder into a beaker, adding water glass solution, and stirring on a magnetic stirrer to obtain the target alkali-resistant refractory coating. The alkali-resistant fire-resistant coating for the building has excellent alkali resistance, good mechanical property and fire-resistant and combustion-resistant properties, and is simple in preparation process and suitable for industrial production.

Inventors

  • PAN HONGJIANG
  • YIN PENGHUI
  • FENG JING
  • SONG JIANBO

Assignees

  • 昆明理工大学

Dates

Publication Date
20260505
Application Date
20240221

Claims (8)

  1. 1. The alkali-resistant fire-resistant coating for the building is characterized by being prepared from, by weight, 20-60 parts of modified aluminum tripolyphosphate powder, 20-40 parts of water glass, 10-20 parts of silicon dioxide, 5-10 parts of aluminum oxide, 1-5 parts of kaolin, 1-5 parts of zirconium oxide, 1-5 parts of anhydrous calcium sulfate, 2-8 parts of an adhesive, 0.75-1.05 parts of a curing agent and 1-2 parts of a defoaming agent, wherein the modified aluminum tripolyphosphate is prepared from aluminum tripolyphosphate and a modifying agent, the modifying agent is composed of zinc oxide, calcium oxide and magnesium oxide with the particle size of 250-500 meshes, and the weight ratio of the aluminum tripolyphosphate to the zinc oxide to the calcium oxide to the magnesium oxide is 10:2-4:2.
  2. 2. The alkali-resistant and fire-resistant coating for buildings according to claim 1, wherein the modulus of the water glass is 2.6-3.7, and the particle size of the silicon dioxide, the aluminum oxide, the kaolin, the zirconium oxide and the anhydrous calcium sulfate is 250-500 meshes.
  3. 3. The alkali-resistant fire-resistant coating for building according to claim 1, wherein the adhesive is epoxy resin, phenolic resin or 0.1-20% polyvinyl alcohol.
  4. 4. The alkali-resistant fire-resistant coating for building according to claim 1, wherein the curing agent is phthalic anhydride, 4-diaminodiphenylmethane or 0.1-5% ethylenediamine.
  5. 5. The alkali-resistant fire-resistant coating for building according to claim 1, wherein the defoaming agent is polydimethylsiloxane and/or 0.05-1% of polyether type defoaming agent.
  6. 6. A method for preparing the alkali-resistant fire-resistant coating for buildings according to claim 1, which is characterized by comprising the following steps: 1) Blending aluminum tripolyphosphate and a modifier in a ball mill for 120min at a rotating speed of 300r/min, adding alcohol as a ball milling medium, ball milling for 600min at the rotating speed of 300r/min, ball milling for 120min at the rotating speed of 300r/min by taking water as a ball milling medium, and sieving with a 200-mesh screen after drying to obtain modified aluminum tripolyphosphate powder; 2) Weighing modified aluminum tripolyphosphate powder, adding water glass, silicon dioxide, aluminum oxide, kaolin and zirconium oxide, magnetically stirring at a rotating speed of 400-600 r/min for 20-100 min, adding anhydrous calcium sulfate, continuously stirring to obtain a solid phase matrix, uniformly mixing an adhesive, a curing agent and a defoaming agent, adding the mixture into the solid phase matrix, and continuously stirring until the mixture is fully fused to obtain the alkali-resistant fireproof coating.
  7. 7. The application of the alkali-resistant fire-resistant coating for building in preparation of a building surface coating is characterized in that the alkali-resistant fire-resistant coating for building is uniformly coated on the surface of a building material by spraying or brushing after polishing and cleaning the surface of the building material, and the coating thickness is 0.5-10 mm.
  8. 8. The application of claim 7, wherein the spraying is to connect a spray can with an air compressor, and the alkali-resistant and fire-resistant coating for building is sprayed on the steel substrate by means of strong air pressure, wherein the spraying speed of the spray can is 0.3-6L/min, and the spraying distance from metal is 10 cm-80 cm.

Description

Alkali-resistant fire-resistant coating for building and preparation method and application thereof Technical Field The invention belongs to the technical field of composite material coatings, and particularly relates to an alkali-resistant refractory coating for a building, and a preparation method and application thereof. Background In an industrial plant and chemical storage warehouse environment using strong alkali as a production raw material or producing strong alkali, since strong alkali chemically reacts with many building materials, especially cement, there is a phenomenon of corroding the building materials when the building materials are exposed to the strong alkali environment for a long time or accidents such as leakage of chemical raw materials and fire disaster occur, so that related working environments (e.g., industrial plant and chemical storage warehouse) need alkali-resistant anticorrosive paint to protect building walls and cement walls from being corroded by special industrial environments to affect building safety. The anticorrosive paint is one kind of continuous coating to form firm adhesion to the surface of material to isolate the material from surrounding medium, such as humidity, water, chemical atmosphere, electrolyte, organic solvent, acid, alkali, etc. to eliminate and release the chemical and electrochemical effects of the material. The existing alkali-resistant paint mainly has the following problems: (1) The existing alkali-resistant coating matrix takes organic matters as main materials, and in the long-term use process, the serious aging problem is faced, the protection effect is gradually reduced, the coating is bubbling, cracking and even falling off, so that the coating loses the protection function, the material is invalid, and the actual service life is greatly reduced; (2) Because the structure of the organic matters is mainly carbon-oxygen bonds and hydrocarbon bonds, when accidents such as fire disaster and the like are encountered, the alkali-resistant paint taking the organic matters as main materials can burn to promote fire, and great potential safety hazards exist in the aspect of fire prevention; (3) The existing alkali-resistant paint is often added with non-environment-friendly raw materials such as heavy metal red lead, zinc chrome yellow and the like, so that the environment-friendly anti-corrosion paint has great challenges in the aspect of environment protection, has high solid differentiation and is free from solvation, and is a development trend of environment-friendly anti-corrosion paint. Therefore, new alkali-resistant and fire-resistant coatings based on inorganic solid phases are urgently needed in the market. Disclosure of Invention The first aim of the invention is to provide an alkali-resistant fire-resistant coating for buildings, and the second aim of the invention is to provide a preparation method and application of the alkali-resistant fire-resistant coating for buildings. The alkali-resistant refractory coating for the building comprises, by weight, 20-60 parts of aluminum tripolyphosphate, 20-40 parts of water glass, 10-20 parts of silicon dioxide, 5-10 parts of aluminum oxide, 1-5 parts of kaolin, 1-5 parts of zirconium oxide, 1-5 parts of anhydrous calcium sulfate, 5-40 parts of a modifier, 2-8 parts of an adhesive, 1-2 parts of a curing agent and 1-2 parts of a defoaming agent. The second object of the invention is realized by the preparation method of the alkali-resistant fire-resistant paint for building, which comprises the following steps: 1) Blending aluminum tripolyphosphate and a modifier in a ball mill for 10-120 min to obtain modified aluminum tripolyphosphate, ball milling for 60-720min by taking alcohol and water as wet milling liquid, ball milling at a speed of 100-800r/min, taking out and drying for 36-48h; 2) And (2) putting silicon dioxide, aluminum oxide, kaolin, zirconium oxide, anhydrous calcium sulfate, an adhesive, a curing agent, a defoaming agent and the modified aluminum tripolyphosphate powder in the step (1) into a beaker, adding a water glass solution, placing the beaker on a magnetic stirrer for stirring, and regulating the viscosity to obtain the target coating. The application of the alkali-resistant fire-resistant coating for the building is the application in preparing the coating on the surface of the building, and the specific coating method is that after the surface of the building material is polished and cleaned, the alkali-resistant fire-resistant coating for the building is uniformly coated on the surface of the building material by spraying or brushing, and the coating thickness is 0.5-10 mm. The beneficial effects of the invention are as follows: 1. The alkali-resistant fire-resistant paint for building uses aluminum tripolyphosphate as one of the main raw materials, the aluminum tripolyphosphate is an inorganic solid phase, does not burn, can generate a certain degree of ceramic at high temp