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CN-121975356-A - High-performance composite fireproof coating and preparation method thereof

CN121975356ACN 121975356 ACN121975356 ACN 121975356ACN-121975356-A

Abstract

The invention belongs to the technical field of coatings, and particularly relates to a high-performance composite fireproof coating and a preparation method thereof. The high-performance composite fireproof coating is prepared from phosphogypsum, modified fiber, expanded perlite, a gypsum retarder, short fiber, cellulose ether, a gypsum-based multifunctional auxiliary agent, starch ether, an air entraining agent and an inorganic heat preservation mortar additive. The invention uses industrial solid waste phosphogypsum as a main raw material, and solves the technical problems of low phosphogypsum utilization rate, poor component cooperativity and insufficient comprehensive performance of the existing phosphogypsum-based coating. Meanwhile, the long and short fiber synergistic enhancement and multi-auxiliary agent synergistic optimization are adopted, so that the coating has the advantages of high strength, low heat conduction, high water resistance, crack resistance, freezing and thawing resistance, excellent fireproof performance and the like, is convenient to construct, accords with the development trend of green low carbon, and is suitable for use in key projects of large steel structure buildings such as petroleum, petrifaction, high-speed rail, airports, gymnasiums and steel structure plants and heat preservation and decoration of inner and outer walls of the buildings.

Inventors

  • YU HOUQIANG

Assignees

  • 湖北瀚宇新型材料有限公司

Dates

Publication Date
20260505
Application Date
20260316

Claims (10)

  1. 1. The high-performance composite fireproof coating is characterized by being prepared from the following raw materials in parts by weight: 70-90 parts of phosphogypsum; 3-7 parts by weight of modified fiber; 8-12 parts of expanded perlite; 0.3-0.7 parts by weight of gypsum retarder; 0.1-0.3 parts by weight of short fibers; 0.3-0.7 parts by weight of cellulose ether; 0.5-1 parts by weight of a gypsum-based multifunctional additive; 0.2-0.4 parts by weight of starch ether; 0.1-0.3 parts by weight of an air entraining agent; 2-3 parts of inorganic thermal insulation mortar additive.
  2. 2. The high-performance composite fireproof coating according to claim 1, wherein the high-performance composite fireproof coating is prepared from the following raw materials in parts by weight: 80 parts of phosphogypsum; 5 parts by weight of modified fiber; 10 parts of expanded perlite; 0.5 parts of gypsum retarder; 0.2 parts by weight of short fibers; Cellulose ether 0.5 parts by weight; 0.8 parts by weight of gypsum-based multifunctional auxiliary agent; Starch ether 0.3 parts by weight; 0.2 parts by weight of an air entraining agent; 2.5 parts by weight of an inorganic heat-insulating mortar additive.
  3. 3. The high performance composite fire retardant coating according to claim 1, wherein, The gypsum retarder is one or more selected from citric acid, citrate, tartaric acid, tartrate, phosphate, polyacrylate, sodium gluconate and guar gum.
  4. 4. The high performance composite fire retardant coating according to claim 1, wherein, The modified fiber is prepared from polyester fiber and organosilane; the organic silane is selected from one or more of gamma-glycidol ether oxygen propyl trimethoxy silane, gamma-aminopropyl triethoxy silane, gamma-methacryloxy propyl trimethoxy silane or vinyl trimethoxy silane.
  5. 5. The high performance composite fire retardant coating according to claim 1, wherein, The short fibers are selected from one or more of polyethylene terephthalate fibers, polyamide fibers, carbon fibers and polypropylene terephthalate fibers; the length of the short fiber is 3-7 mm.
  6. 6. The high performance composite fire retardant coating according to claim 1, wherein, The cellulose ether is selected from one or more of methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose and carboxymethyl cellulose, and/or, The gypsum-based multifunctional auxiliary agent is prepared by compounding (by mass ratio) a polycarboxylate water reducer, an organosilicon water repellent, a polyvinyl alcohol reinforcing agent and a sodium gluconate retarding synergist (2-4), wherein (1-2) is (1-1.5) and (1-1.5).
  7. 7. The high performance composite fire retardant coating according to claim 1, wherein, The air entraining agent is one or more selected from rosin thermopolymer, sodium abietate, alkylbenzene sulfonate, alkyl sulfonate, fatty alcohol polyoxyethylene ether sodium sulfate, triterpenoid saponin and lignin sulfonate, and/or, The inorganic thermal insulation mortar additive is one or more selected from potassium silicate, sodium silicate, lithium silicate, modified silica sol, aluminate, silicate composite powder, redispersible latex powder, water reducer and water repellent.
  8. 8. A method of preparing a high performance composite fire retardant coating according to any one of claims 1 to 7, comprising the steps of: Step 1, mixing modified fibers, a gypsum retarder, short fibers, cellulose ether, a gypsum-based multifunctional auxiliary agent, starch ether and an air entraining agent, and uniformly stirring to obtain a premix; and step 2, adding phosphogypsum into the premix, uniformly stirring, then adding the inorganic thermal insulation mortar additive and the expanded perlite, and uniformly stirring to obtain the high-performance composite fireproof coating.
  9. 9. The method according to claim 8, wherein in step 1, The stirring temperature is 20-30 ℃, and the stirring time is 10-20 min; The preparation method of the modified fiber comprises the following steps: crushing polyester fibers to obtain crushed polyester fibers, adding acetic acid into ethanol to adjust the pH of the solution, adding organosilane to hydrolyze, adding the crushed polyester fibers after hydrolysis, uniformly mixing, reacting under stirring, and drying in vacuum after the reaction is finished to obtain modified fibers.
  10. 10. The method according to claim 8, wherein in step 2, Adding phosphogypsum into the premix, and stirring for 3-7 min at 20-30 ℃; and adding the inorganic heat-insulating mortar additive and the expanded perlite, and stirring for 5-15 min at 20-30 ℃.

Description

High-performance composite fireproof coating and preparation method thereof Technical Field The invention belongs to the technical field of coatings, and particularly relates to a high-performance composite fireproof coating and a preparation method thereof. Background With the deep implementation of global 'double carbon' target promotion and 'non-waste city' construction, the industrial solid waste recycling utilization becomes one of core paths for realizing green low-carbon development, wherein phosphogypsum is taken as a main industrial byproduct generated by the phosphate fertilizer industry, and the large-scale digestion and high-value utilization of phosphogypsum are paid attention to. At present, the phosphogypsum stockpiling amount in China exceeds 5 hundred million tons, the annual new increment reaches 7000-8000 ten thousand tons, but the comprehensive utilization rate is only about 40%, and a large amount of phosphogypsum is piled for a long time, so that not only does precious land resources be occupied, but also environmental safety hidden hazards such as soluble phosphorus and fluorine leakage and heavy metal leakage exist, and huge pressure is brought to ecological environment treatment, therefore, the high-value utilization way of phosphogypsum is expanded, the 'waste material replacement' is realized, and the method becomes urgent demand and research hot spot for current industry development. The building coating is used as a core material in the field of building decoration, has huge market demand, and brings higher standards to the comprehensive properties (such as heat preservation and insulation, mechanical strength, water resistance and crack resistance, construction convenience and the like) of the coating along with rapid development of assembled buildings and continuous improvement of the requirements of people on living environment comfort and environmental friendliness. The traditional building coating mostly uses natural gypsum, calcium carbonate and the like as main raw materials, thus not only facing the problem of shortage of natural resources, but also being difficult to consider in the aspects of heat insulation, crack resistance and the like, and meanwhile, the production process of the building coating has higher carbon emission and does not accord with the development trend of green building materials. In the prior art, related attempts to apply phosphogypsum to the preparation of building paint are made, and the aim is to realize the resource utilization of phosphogypsum and reduce the production cost of paint. However, because phosphogypsum has complex components and higher impurity content, the problems of insufficient strength, poor water resistance, easy cracking and the like of the coating are easily caused by direct application, and the large-scale application of the phosphogypsum is limited. Meanwhile, in order to improve the application performance of the coating, the prior art has the defects of poor component cooperativity and incomplete performance optimization, for example, the cracking resistance and toughness of the coating are difficult to improve at the same time, and the construction property, the heat preservation property and the durability of the coating cannot be considered. In addition, the existing phosphogypsum-based composite coating preparation process has the problems of inaccurate stirring parameters, unreasonable raw material mixing sequence and the like, so that the components are unevenly dispersed, and the comprehensive performance stability of the coating is further affected. Meanwhile, the special composite auxiliary agent system for phosphogypsum-based paint is lacking in the prior art, so that the performance defect caused by soluble impurities in phosphogypsum is difficult to effectively overcome, and the synergistic improvement of the heat preservation, strength, water resistance, crack resistance, fire resistance and other performances of the paint cannot be realized. In summary, the current phosphogypsum-based building coating has the defects of low phosphogypsum utilization rate, poor component cooperativity, insufficient comprehensive performance, non-optimized preparation process and the like, and cannot meet the requirements of modern buildings on green and high-performance coatings. Therefore, the development of the high-performance composite fireproof coating which takes phosphogypsum as the main raw material, realizes the high-value utilization of phosphogypsum and the multi-performance synergistic improvement of the coating through reasonably screening raw material components, optimizing the proportion and the preparation process has important practical significance and industrial application value, and is also a technical problem to be solved by the current technicians in the field. Disclosure of Invention Based on the technical background, the main purpose of the invention is to provide a high-performance composite fire