Enhancing waterproof performance of phosphogypsum non-fired ceramics by coating silane-coupled unsaturated polyester resin

[Display omitted] •Waterproof non-fired ceramics were prepared using waste phosphogypsum.•Water resistance was enhanced by silane coupling and resin coating.•The waterproof non-fired ceramics have application value in building materials.•It is helpful to recycle waste phosphogypsum and reduce enviro...

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Bibliographic Details
Published in:Materials letters 2019-10, Vol.252, p.52-55
Main Authors: Zhou, Jun, Zhang, Yi, Shu, Zhu, Wang, Yanxin, Yakubu, Yahaya, Zhao, Yu, Li, Xiaoqian
Format: Article
Language:English
Subjects:
Building materials
Ceramic coatings
Ceramics
Chemical industry
Construction materials
Contact angle
Coupling agents
Materials science
Non-fired ceramic
Organic chemistry
Phosphogypsum
Polyester resins
Polyesters
Polymers
Silane coupling agent
Surfaces
Waste phosphogypsum
Water absorption
Water pollution
Water resistance
Waterproof property
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Summary:[Display omitted] •Waterproof non-fired ceramics were prepared using waste phosphogypsum.•Water resistance was enhanced by silane coupling and resin coating.•The waterproof non-fired ceramics have application value in building materials.•It is helpful to recycle waste phosphogypsum and reduce environmental pollution. Phosphogypsum (PG) is a large amount of solid waste discharged from the phosphorus chemical industry and poses serious environmental pollution problems. The preparation of non-fired ceramics from PG is an effective method for substantially managing PG waste, but its actual production and utilization are difficult due to poor water resistance of PG. In this paper, a waterproof non-fired ceramic with a dense waterproof layer was prepared from PG by grafting silane coupling agent onto the PG non-fired ceramic and then coating it with unsaturated polyester resin. The bending strengths of waterproofed PG non-fired ceramics before and after soaking in water for 24 h were 20.5 and 15.2 MPa, respectively, and the corresponding softening coefficient was 0.74. Its water absorption rate was 1.12%, while contact angle was 81.6°. The favorable qualities endow the waterproofed PG non-fired ceramics with broad application prospects in building materials. This technique has great potential to reduce the environmental pollution caused by PG with huge economic and social benefits.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2019.05.105