Progress in research on curing temperature of aluminum dihydrogen phosphate

Generally speaking, the cold-set cementing materials should also choose suitable heat treatment conditions due to the performance requirements of the parts. Thermosetting cementitious materials should determine the temperature of heat treatment according to the variety of raw materials and the mechanism of their formation with phosphoric acid. Generally, the curing temperature of phosphate binder is selected between 120 ~ 190 ℃. The temperature is too low, the curing time is too long, the bonding performance is not good, which is not conducive to practical operation; High temperature, short curing time, difficult control, high energy consumption and burning block phenomenon affect the bonding performance.

In the 1950s, the former Soviet Union began the research of phosphate materials for the purpose of heat-resistant materials. Later, the technology was extended to the field of high temperature resistant and wave-transmitting materials. The research work gradually deepened and was applied to models. In the early 1960s, U.S. Navy and Aeronautics Administration funded General Electric Company to start research on low-cost phosphate high-temperature resistant materials, and obtained Shi Ying fabric reinforced phosphate-based composite materials that can cure below 315 ℃, but still maintain good mechanical and electrical properties at 650 ℃. From 1970s to 1980s, the U.S. Air Force Laboratory and other units conducted detailed tests on the dielectric properties of phosphate materials at room temperature and high temperature. In 1975, Japan developed a good and stable aluminochrome phosphate binder. However, chromium is a heavy metal and a harmful element. It was not until 1986 that a new process for casting phosphate self-hardening sand was unveiled for the first time. By the 1980s and 1990s, the curing temperature of phosphate-based composites had dropped to 170 ℃, the dielectric constant was 3.2 ~ 3.8, and the service temperature could reach 1200 ℃. Nora and others developed room temperature curing refractory materials by using calcined magnesium oxide, phosphoric acid or aluminum dihydrogen phosphate, aluminum oxide and silicon oxide. Birchall et al. used aluminum phosphate to bond the mechanical properties of unsintered silicon carbide. Toy et al. studied the reaction of calcined alumina with phosphoric acid and considered AlPO3 and Al(P03)3 to be effective bonding phases. B.Formanek elaborated the preparation basis of phosphate-based composite coatings for power plants. In the aspect of rapid repair of concrete, QuanbinYang et al. developed cement-based magnesium oxide - phosphate adhesive, discussed the effects of retarder borax powder dosage, fly ash dosage, M/P ratio on curing time and curing temperature, and proposed its bonding mechanism.

yucai chemical Factory specializes in the production of: sodium hexametaphosphate, sodium pyrophosphate, sodium tripolyphosphate, disodium hydrogen phosphate, industrial phosphoric acid, trisodium phosphate, aluminum dihydrogen phosphate, solid aluminum dihydrogen phosphate, liquid aluminum dihydrogen phosphate, sodium dihydrogen phosphate and other phosphate series. After more than 30 years of continuous pursuit and development, Yucai Phosphate has established a good cooperation and sharing relationship with many colleges and universities through skilled chemical technology and product development, equipment renewal, and has established a brand name ( Yucai Phosphate ) in the chemical industry!