Introduction
Bimonthly, started in 1957
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
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Effect of Mineral Fillers on Properties of Water-based Ultra-thin Fireproof Coatings
DOI:
10.16355/j.tyut.1007-9432.20230147
Received:
Accepted:
| Corresponding author | Institute | |
| MA Jianchao | College of Mining Technology, Taiyuan University of Technology |
abstract:
【Purposes】The effects of different mineral fillers and their compound ratio on the properties of water-based ultra-thin fireproof coatings are worth studying.【Methods】Aqueous epoxy/acrylic composite emulsion was used as film material. Ammonium polyphosphate, pentaerythritol, and melamine were used as expansion systems. Titanium dioxide (TiO2), coal gangue (CG), bentonite (BT), and hydrotalc (LDH) were used as mineral fillers.【Findings】The results show that the fire resistance of single mineral filler is as follows: TiO2>CG>BT>LDH. When the single TiO2filler fireproof coating burns for 80 min, the carbon expansion rate reaches 13.6, the back temperature of steel plate is 274.9℃, and the carbon layer structure is in strength weak. The compound mineral fillers can achieve the goals of high efficiency fire prevention, low energy consumption, cost-effectivenes and environmental protection, and provide a new way to the high value utilization of mineral fillers When m(TiO2)∶m(BT)∶m(LDH) composite ratio is 6∶2∶2, the expansion ratio of carbon layer is 14.9, and the back temperature of steel plate is only 268.8℃. When the m(TiO2)∶m(BT)∶m(CG) mixture ratio is 8∶1∶1, the expansion ratio is 14.5, the steel plate back temperature is only 261.0℃, and the fire resistance performance is better than that of single mineral filler. Scanning electron microscopy mages show that the addition of BT, CG, and LDH makes the surface structure of the carbon layer more compact and stronger. Infrared spectroscopy analysis results show that phosphide and metal oxides in the residue of burned carbon layer enhance the structural strength of the carbon layer. Thermal gravimetric analysis data show that the carbon residues of the two coatings are 36.35% and 36.92%, which improves the thermal shielding performance of the carbon layer.
Keywords:
water-based ultra-thin fireproof coating; mineral filler; expansion multiplier; back temperature of steel plate; coal gangue;