Modified aluminate cement retarder compounded from AMPS copolymer pre-chelated with aluminum ions, and borate and preparation method thereof

The invention provides a modified aluminate cement retarder compounded from an AMPS copolymer pre-chelated with pre-chelation aluminum ions, and a borate and a preparation method thereof. The method includes the steps of firstly adding a certain mass of the AMPS copolymer and an aluminum salt into water, and performing stirring, conducting heating to a pre-chelation temperature, carrying out chelation for certain period of time, and performing cooling to obtain the AMPS copolymer pre-chelated with aluminum ions, and then dissolving a certain amount of tetraboric acid in the AMPS copolymer pre-chelated with aluminum ions. The retarder compounded from the AMPS copolymer pre-chelated with aluminum ions, and the borate prepared by the method provided by the invention can effectively improve the rheological properties of cement slurry, makes cement slurry have good right angle thickening performance, realizes right angle thickening, has little influence on the compressive strength of cement stones, and has the adv