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Indoor thick steel structure fireproof coating and preparation method thereof

A technology for fire-resistant coatings and steel structures, applied in fire-resistant coatings, alkali metal silicate coatings, coatings, etc., can solve problems such as loss of bearing capacity, aggravated smoke generation, and cracking of fire-resistant coatings

Active Publication Date: 2021-01-22
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the extensive use of cement-based binders may cause cracking due to incomplete or inhibited hydration and hydrolysis of cement, affecting its gelation and hardening process, resulting in accelerated aging of the coating, and being affected When the flame passes through the gap during the fire, the steel member will heat up rapidly and lose its bearing capacity; in addition, the extensive use of cement-based binders requires more organic emulsions and organic additives to control the physical and chemical properties, which intensifies to a certain extent. Smoke generation of fire retardant coatings when exposed to fire

Method used

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  • Indoor thick steel structure fireproof coating and preparation method thereof
  • Indoor thick steel structure fireproof coating and preparation method thereof
  • Indoor thick steel structure fireproof coating and preparation method thereof

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preparation example Construction

[0054] In the present invention, the acid leaching filtrate obtained in the preparation process of the sodium silicate solution is preferably taken, and the pH is adjusted to 11-13 to obtain an alkaline solution.

[0055] In the present invention, the pH adjustment is preferably by adding an alkaline solution, and the alkaline solution is preferably a sodium hydroxide solution; the mass concentration of the alkaline solution is 15-25%, more preferably 18-22%.

[0056] After the alkaline solution is obtained, the present invention preferably passes excess carbon dioxide into the alkaline solution to obtain a suspension and then remove the solvent to obtain aluminum hydroxide.

[0057] In the present invention, the rate and time of introducing carbon dioxide are not particularly limited, as long as the components in the alkaline solution can be fully reacted.

[0058] In the present invention, the method of removing the solvent after obtaining the suspension is preferably drying...

Embodiment 1

[0087] The specific preparation steps of the indoor thick steel structure fireproof coating prepared in this embodiment are as follows:

[0088] Pass the fly ash hollow microspheres through an 80-mesh standard sieve, and take the unsieved microspheres (particle size > 180 μm) for ball milling at a speed of 300 r / min for 4 hours until the particle size is about 19 μm.

[0089] After the above-mentioned ball-milled fly ash hollow microspheres and the compound alkali are ground and mixed uniformly according to the mass ratio of 0.5:1, they are roasted at 700° C. for 1 hour to obtain nepheline; the compound alkali is sodium carbonate and sodium hydroxide, The mass ratio is 0.5:1.

[0090] The nepheline obtained in the above steps was acid-leached with 8% hydrochloric acid at 95°C for 10 minutes to obtain acid residue and acid leaching filtrate, wherein the mass ratio of liquid to solid during acid leaching was 15:1.

[0091] The acid slag obtained in the above steps is added to s...

Embodiment 2

[0098] The specific preparation steps of the indoor thick steel structure fireproof coating prepared in this embodiment are as follows:

[0099] Pass the fly ash hollow microspheres through an 80-mesh standard sieve, and take the unsieved microspheres (particle size > 180 μm) for ball milling at a speed of 400 r / min for 5 hours until the particle size is about 17 μm.

[0100] After the above-mentioned ball-milled fly ash hollow microspheres and the compound alkali are ground and mixed uniformly according to a mass ratio of 1:1, they are roasted at 790° C. for 2 hours to obtain nepheline; the compound alkali is sodium carbonate and sodium hydroxide, Its mass ratio is 1:1.

[0101] The nepheline obtained in the above steps was pickled with hydrochloric acid with a mass concentration of 12% at 80°C for 15 minutes to obtain acid residue and acid leach filtrate, wherein the mass ratio of liquid to solid during acid leaching was 12:1.

[0102] The acid slag obtained in the above st...

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Abstract

The invention provides an indoor thick steel structure fireproof coating, which relates to the technical field of fireproof coatings, and comprises the following components by mass: 5-20 parts of flyash hollow microspheres, 20-60 parts of a sodium silicate solution, 5-10 parts of expanded perlite, 1-3 parts of aluminum silicate fiber, 5-15 parts of aluminum hydroxide, 5-15 parts of magnesium hydroxide, 1-3 parts of a porous active silicon material, 5-15 parts of titanium dioxide, 10-20 parts of apure acrylic emulsion, 0.2-1 part of adispersive agent, 0.2-1 part of an antifoaming agent, 0.2-1part of a plasticizer, 0.2-1 part of a leveling agent, 0.2-1.5 parts of a coalescing agent and 20-60 parts of water. According to the invention, the small-particle-size hollow microspheres are used asa filler, and the sodium silicate solution prepared from the screened residual large-particle-size hollow microspheres is used as a binder of the coating, so that the resource reutilization is realized, and the fireproof coating has excellent physical and chemical properties and heat insulation and flame retardancy under the condition of not using cement.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to an indoor thick steel structure fireproof coating and a preparation method thereof. Background technique [0002] Due to its great advantages in stability, stiffness and seismic performance, steel structure buildings have been widely used in modern buildings in various fields. However, steel itself has the characteristics of poor fire resistance and anti-corrosion performance. On the one hand, steel is a good heat conductor, and its thermal conductivity is about 40 times that of traditional masonry, and its thermal expansion coefficient is large, so it is easy to deform; Mechanical parameters such as yield stress and elastic modulus have a negative correlation with temperature. As the temperature rises, when the steel reaches the critical temperature (540°C), it basically loses its bearing capacity. According to the fire standard temperature rise curve, it can be reached in abou...

Claims

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Application Information

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IPC IPC(8): C09D1/04C09D5/18C09D7/61C09D7/63C09D7/65
CPCC09D1/04C09D5/18C09D7/61C09D7/63C09D7/65C09D7/70
Inventor 张永锋张印民刘斌李炜王卫江
Owner INNER MONGOLIA UNIV OF TECH
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