June 04, 2020

Study on Preparation of Kaolin-based Mineral Polymer Materials and Factors Affecting Resistance to Zhuang

Polymers derived from mineral gelpolymer J.Davidovits French scientists proposed in the 1970s, the intent is aluminosilicate mineral polymer formed by chemical action, i.e., the inorganic [SiO 4] and [AlO 4] tetrahedral An inorganic polymer having a three-dimensional network structure formed by a bulk linkage and containing a plurality of amorphous to semicrystalline phases. Most of these materials are mainly made of natural aluminosilicate minerals or industrial solid waste, and are excited by an alkaline activator and synthesized at 20 to 200 °C.

Mineral polymers combine the structure and properties of minerals and polymers. In terms of chemical composition, the mineral polymer is mainly aluminosilicate product, which has the characteristics of minerals, high temperature resistance, corrosion resistance, non-aging, good stability, and does not burn or emit toxic gases; in structure, mineral polymer It has a bonded structure of organic polymer, but its basic structure is inorganic [SiO 4 ] and [AlO 4 ] tetrahedron. After hydration, it polymerizes to form a network structure, which has the characteristics of high molecular polymer and good cementation performance. And high intensity. Used as high-strength cement, it has low hydration heat, early strength and fast hardness, high strength, corrosion resistance and small shrinkage compared with ordinary cement. It is used for fixing nuclear waste and can withstand radiation and hydrothermal effects for a long time without aging. is an organic polymer and Portland cement performance can not be achieved; cage-type polymer having a microstructure of mineral molecular size, good permeability, can almost all of the toxic metal ions effectively locking the cage structure It can also be used as refractory and thermal insulation material, can withstand high temperature of 1000~1200 °C, and has good heat insulation performance. Therefore, mineral polymers can be widely used in the automotive and aerospace industries, non- ferrous foundry and metallurgy, civil engineering, transportation and repair engineering, plastics industry, toxic element curing and nuclear waste treatment, art and decorative materials and storage facilities.

The experimental results of researchers at China University of Geosciences (Wuhan) show that the calcination temperature of kaolin , the blending ratio of mineral polymer preparation materials, and the curing temperature have a great influence on the compressive strength of mineral polymer materials. The calcination temperature of kaolin is 500-900 °C, the compressive strength of mineral polymer increases first and then decreases, and the mineral polymer with 600 °C calcined kaolin is cured for 7 days, the compressive strength is the largest, 80.5 MPa; metakaolin, water glass, The optimum mass ratio of NaOH is 7.5:6:1; increasing the curing temperature can significantly increase the early strength of mineral polymer, curing at 60 ° C for 2 h, the compressive strength of mineral polymer can reach 70 MPa or more; but in the maintenance of water shortage Under the condition, the compressive strength of the mineral polymer decreases with the increase of temperature or the curing time.


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