Kaolin-based binding agent as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of inorganic binding agents, and provides a kaolin-based binding agent which is prepared from the following raw materials: kaolin and phosphoric acid in a mass ratio of 100: (50-300). The kaolin-based binding agent is prepared by taking kaolin as a raw material and phosphoric acid as a binding agent; kaolin is clay and clay rock mainly comprising kaolinite clay minerals, is wide in source and low in cost, and has relatively strong acid resistance; the kaolin can be subjected to chemical reaction with the phosphoric acid, and aluminum dihydrogen phosphate, aluminum monohydrogen phosphate and silica gel which are high in adhesive property are generated by controlling the mass ratio of phosphoric acid to kaolin. A result of the embodiment shows that the compressive strength of a product prepared from the kaolin-based binding agent provided by the invention, quartz sand and magnesium oxide is 11.59 MPa.

Description

technical field [0001] The invention relates to the technical field of inorganic binders, in particular to a kaolin-based binder and its preparation method and application. Background technique [0002] Phosphate binder is a kind of building cementing material, which has plasticity before setting and hardening, and can be made into products of any size and shape according to requirements; it can be cured at room temperature or sintered at high temperature; it can be combined with dispersant, curing agent, aggregate etc. to be used together to make the same product as concrete. Moreover, phosphate binders have high strength, high hardness, good water resistance, small curing shrinkage, environmental protection and non-toxicity, good construction performance, and strong adaptability to materials, and are widely used in refractory materials, building materials, metal casting, Inorganic coatings, composite materials and other industrial and civil fields. [0003] Common phosph...

AI Technical Summary

Problems solved by technology

[0003] Common phosphate binders include aluminum dihydrogen phosphate and silicon phosphate. However, in the prior art, high-quality alumina or aluminum hydroxide is usually used to prepare aluminum dihydrogen phosphate, which is expensive and limits its application and promotion; However, the preparation of silicon phosphate in the prior art usually uses quartz as the basic raw material and is synthesized at high temperature (700-1000°C), and the manufacturing cost is also relatively high.

Therefore, it is urgent to solve the problem of high manufacturing cost of existing phosphate-based binders in order to realize the wide application of phosphate binders