With the rapid development of ceramic technology, ceramic products are widely used in various fields such as daily life and industrial production. In ceramic production, binders play a decisive role in maintaining the embryonic shape of ceramic products and their strength and compression resistance. It also plays a crucial role in the yield of the product.
In ceramic injection molding, the binder has two basic functions: first, in the injection molding stage, as a carrier, it can be evenly mixed with the powder, and after heating, it can make the powder have good fluidity, so that it can be injected smoothly. without producing defects; secondly, the binder can maintain the shape of the green body after injection molding and during debinding.
It can be said that the selection and preparation of binder is the core and key of CIM technology, and every breakthrough and progress of CIM process is accompanied by the birth of new bonding system.
Clay has the characteristics of unique adhesiveness and water-swelling plasticity, and is often used as a binder for ceramic products. However, due to the high content of impurities in natural clay, the impurities remain in the glass phase after high temperature sintering, which will reduce the strength and pressure resistance of ceramic products. The ideal binder should be beneficial to increase the powder loading, so that the feed has high strength and elastic modulus at room temperature, and good fluidity at mixing and injection temperatures.
With the continuous improvement of the quality requirements of ceramic products, organic polymer binders such as water-based wax emulsions are gradually used in ceramic production. Because emulsified wax has the characteristics of non-toxicity, non-volatile, good dispersibility, uniform film laying, good lubricity, good fluidity and permeability, adhesion, and no metal impurities, the application of emulsified wax in the ceramic production process, It can not only improve the fluidity of the powder and the mold release of the injection, but also improve the compactness of the injection and the strength of the green body. Paraffin wax has low molecular weight, low viscosity, good wettability with powder, and no chemical reaction with each other, simple degreasing process, very little residue after degreasing, and no environmental pollution.
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