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CN-122011844-A - Moisture-heat-resistant cracking-resistant indoor non-expansion fireproof coating and preparation method thereof

CN122011844ACN 122011844 ACN122011844 ACN 122011844ACN-122011844-A

Abstract

The invention discloses a moisture-heat resistant anti-cracking indoor non-expansion fireproof coating and a preparation method thereof, and the preparation method comprises the steps of firstly mixing deionized water, hydroxypropyl methyl cellulose ether and polycarboxylate water reducer to prepare a base solution, then adding layered magnesium zinc silicate, aluminum calcium borosilicate nano hybrid ceramic powder, kaolin, sericite powder, glass powder, titanium pigment and modified hollow ceramic microbeads into the base solution, uniformly stirring, then adding styrene-acrylic ester copolymer emulsion and redispersible emulsion powder to obtain a mixture, and finally adding an organosilicon defoamer and a polyurethane leveling agent into the mixture, and stirring to obtain the building fireproof material. According to the invention, through the synergistic effect of two specific inorganic modified compounds and optimization of a filler system, the obtained coating has excellent wet heat resistance and cracking resistance in a normal state, can form a compact and stable non-expansion heat insulation protective layer at a high temperature in a fire disaster, and has remarkably improved comprehensive performance.

Inventors

  • LI JUAN
  • ZHANG XIAOYU
  • LI YANJUN
  • CHEN QINGWEI
  • Hou Chaozhe
  • ZHENG LIMIN

Assignees

  • 河北永泰集团股份有限公司

Dates

Publication Date
20260512
Application Date
20260326

Claims (10)

  1. 1. A preparation method of a moisture-heat resistant anti-cracking indoor non-expansion fireproof coating is characterized by comprising the following steps: S1, adding 38-42 parts of deionized water, 2-4 parts of hydroxypropyl methyl cellulose ether and 1-3 parts of polycarboxylate high-efficiency water reducer into a dispersing container under stirring to obtain a base solution, adding 14-16 parts of layered magnesium zinc silicate, 8-12 parts of aluminum calcium borosilicate nano hybrid ceramic powder, 25-35 parts of kaolin, 15-25 parts of sericite powder, 10-15 parts of glass powder, 6-10 parts of titanium dioxide and 16-20 parts of hollow ceramic microbeads modified by a silane coupling agent into the base solution, stirring, adding 24-26 parts of styrene-acrylate copolymer emulsion and 4-6 parts of redispersible emulsion powder, and stirring and mixing to obtain a mixture; s2, adding 0.4-0.6 part of organosilicon defoamer and 1.4-1.6 parts of polyurethane flatting agent into the mixture, and stirring.
  2. 2. The method for preparing a non-intumescent fire retardant coating in a heat and humidity resistant cracking resistant room according to claim 1, wherein in step S1, the particle size of the hollow ceramic microbeads modified by the silane coupling agent is 50-150 μm.
  3. 3. The method for preparing the wet heat resistant and crack resistant indoor non-intumescent fire retardant coating according to claim 1, wherein in step S2, the stirring time is 15-30min.
  4. 4. The method for preparing the wet heat resistant anti-cracking indoor non-intumescent fire retardant coating according to claim 1, wherein the method for preparing the layered magnesium zinc silicate comprises the following steps: 1, dissolving 8-10 parts of zinc nitrate hexahydrate and 10-14 parts of magnesium nitrate hexahydrate in 180-220 parts of deionized water together by weight, and stirring to obtain solution A, dissolving 14-16 parts of sodium silicate nonahydrate in 140-160 parts of deionized water, dripping into the solution A under stirring, and regulating the pH to 9.5-10.0 to obtain magnesium zinc silicate precursor suspension; A2, transferring the magnesium zinc silicate precursor suspension into a high-pressure reaction kettle, carrying out hydrothermal crystallization reaction at the temperature of 175-185 ℃, naturally cooling after the reaction is finished, centrifugally separating to obtain solid precipitate, alternately washing the solid precipitate with deionized water and absolute ethyl alcohol, and then carrying out vacuum drying and grinding at the temperature of 78-82 ℃.
  5. 5. The method for preparing a non-intumescent fire retardant coating in a heat and humidity resistant and crack resistant room as claimed in claim 4, wherein in step A2, the time of hydrothermal crystallization reaction is 18-20h at 175-185 ℃.
  6. 6. The method for preparing a non-intumescent fire retardant coating in a heat and humidity resistant and crack resistant room as claimed in claim 4, wherein in step A2, the time of vacuum drying at 78-82 ℃ is 12-14h.
  7. 7. The method for preparing the wet heat resistant anti-cracking indoor non-expansion fireproof coating according to claim 1, wherein the method for preparing the calcium aluminum borosilicate nano hybrid ceramic powder comprises the following steps: Adding 8-12 parts of aluminum nitrate nonahydrate and 10-13 parts of calcium nitrate tetrahydrate into 140-160 parts of absolute ethyl alcohol in parts by weight, and stirring under ice water bath to obtain a suspension, adding 8-10 parts of tetraethoxysilane and 3-5 parts of triethyl borate into 40-60 parts of absolute ethyl alcohol, adding 1.5-3 parts of acetylacetone, and stirring to obtain a solution C; B2, sealing the sol at room temperature, standing for ageing, transferring to a 78-82 ℃ oven for drying to obtain xerogel, placing the xerogel in a muffle furnace, heating to 595-605 ℃ for calcining to obtain a calcined product, and ball-milling the calcined product.
  8. 8. The method for preparing a non-intumescent fire retardant coating in a heat and humidity resistant cracking resistant room according to claim 7, wherein in step B2, the standing and aging time is 48-50 hours.
  9. 9. The method for preparing a non-intumescent fire retardant coating in a heat and humidity resistant and crack resistant room as claimed in claim 7, wherein in the step B2, the calcination time for heating to 595-605 ℃ is 4-6h.
  10. 10. The indoor non-intumescent fire retardant coating resistant to damp heat and cracking, which is characterized in that the indoor non-intumescent fire retardant coating resistant to damp heat and cracking is prepared according to the preparation method of the indoor non-intumescent fire retardant coating resistant to damp heat and cracking of any one of claims 1-9.

Description

Moisture-heat-resistant cracking-resistant indoor non-expansion fireproof coating and preparation method thereof Technical Field The invention relates to the technical field of building fireproof materials, in particular to a damp-heat resistant anti-cracking indoor non-expansion fireproof coating and a preparation method thereof. Background The importance of indoor fireproof paint as a key material for improving the safety of building structures is increasingly prominent. The heat-insulating protective layer is formed on the surface of the protected substrate, so that the temperature rise speed of materials such as steel, concrete and the like in a fire disaster can be effectively delayed, and precious time is striven for personnel evacuation and fire rescue. According to the shape change after fire, the fireproof paint can be divided into two main types, namely expansion type and non-expansion type. The non-expansion fireproof paint mainly relies on the endothermic reaction of inorganic components of the fireproof paint, melts and covers or forms a compact glaze layer to realize heat insulation protection at high temperature of fire, the thickness of the coating is relatively large, and the fireproof durability is generally more stable. In indoor environments, such coatings are widely used, but their long-term performance is severely challenged by environmental factors, especially in some spaces where there are damp-heat problems, the physicochemical stability of the coating directly determines the reliability of the fire protection function. Although the non-intumescent fire retardant coating has a stable fire prevention principle, a series of technical defects which need to be solved still are exposed in practical application, particularly in a humid and obvious indoor environment. The core problem is mainly focused on the insufficient moisture and heat resistance and cracking resistance of the coating. Under the long-term or periodical damp-heat effect, the organic binding phase in the coating is easy to hydrolyze and soften, so that the interfacial binding force between the coating and the inorganic filler is attenuated, further the foaming, stripping and even the whole falling off of the coating are initiated, and the fireproof protection function is rare. Meanwhile, since a variety of inorganic mineral fillers are generally contained in a paint formulation, there is a difference in thermal expansion coefficient between these fillers and an organic matrix, and internal stress is generated during the change of ambient temperature or the drying and curing process of the paint. More serious, under the high-temperature impact of fire burst, the internal and external heating of the coating is uneven, and huge thermal stress can exacerbate the mismatch effect, so that the coating is extremely easy to generate net cracks and even cracks with large area. These cracks can become channels for direct attack of flame and high temperature flue gas on the substrate, severely weakening or even completely destroying the overall thermal barrier effect of the coating, constituting a significant potential safety hazard. In view of the above problems, the improvement direction of the prior art is mainly focused on the improvement of single performance. For example, attempts have been made to increase toughness by simply increasing the amount of fibrous filler, or to introduce certain hydrophobic aids to transiently increase water resistance. However, these methods often address the problem that excessive addition of toughening fibers can impair the compactness and fire resistance of the coating, while common auxiliaries are susceptible to migration failure after long-term humid heat aging. The fundamental challenge is that the moisture and heat resistance, mechanical strength and fire resistance and heat insulation properties at high temperature of the coating are in a mutually restricted relationship. Many modifications aimed at improving the normal temperature properties may have negative effects at high temperatures, such as decomposition to produce a lot of smoke or weakening the compactness of the glaze. Therefore, the development of a novel material system which can cooperatively improve the wet heat resistance and cracking resistance of the non-expansion fireproof paint under the normal state from the microstructure design and ensure that the non-expansion fireproof paint can form a more stable and stronger heat insulation protective layer under the high temperature of fire disaster becomes a critical technical problem which is not solved satisfactorily in the field. The invention aims at systematically overcoming the series of related technical bottlenecks from the aspect of composite modification. Disclosure of Invention The invention aims to provide a moisture-heat-resistant cracking-resistant indoor non-expansion fireproof coating and a preparation method thereof, which solve the technical problems that the e