Alkali-free liquid accelerator and preparation method thereof

• Main Authors: WEI XIAOHONG, WEI JINYOU, YANG JUN
• Format: Patent
• Language: Chinese; English
• Published: 06.12.2022
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; METALLURGY; REFRACTORIES; SLAG; TREATMENT OF NATURAL STONE

The invention relates to the technical field of cement admixtures, and discloses an alkali-free liquid accelerator which is characterized by comprising 60-80 parts of polyaluminum sulfate, 1-5 parts of triethanolamine, 2-8 parts of fluosilicic acid, 5-12 parts of a stabilizer and 30-70 parts of water. The stabilizer is a dispersion system formed by dispersing a montmorillonite-polyamide graft in a nano lamellar liquid. The stabilizer obtained from the dispersion system liquid is added to stabilize the alkali-free liquid accelerator, so that the accelerator can be prevented from precipitating in the storage process, and when the accelerator is applied again, the setting time can be shortened, and the strength of sprayed concrete can be improved. 本发明涉及水泥外加剂技术领域，公开了无碱液体速凝剂，其特征在于，包括聚合硫酸铝60～80份、三乙醇胺1～5份、氟硅酸2～8份、稳定剂5～12份、水30～70份；稳定剂为蒙脱土-聚酰胺接枝物分散于纳米片层液后形成的分散体系。本申请通过加入由分散体系液得到的稳定剂，用以稳定无碱液体速凝剂，能够避免速凝剂在存放过程中出现沉淀，同时再应用时，能够缩短凝结时间，提升喷射混凝土的强度。