硅溶胶是一种新型的水基粘结剂。由于它与硅酸乙酯相比具有制造容易、使用简便、能节约大量乙醇、不易燃烧、涂料存放期长、壳型烧结强度高和抗热变形能力好等优点,因而,近几年来,在熔模精密铸造上的应用日益广泛。 但是,作为一种水基粘结剂的硅溶胶也带来了两个难以避免的缺点,就是用它配制的涂料涂挂性差和干燥缓慢。尤其是在涂挂性方面,硅溶胶涂料表面张力大,对蜡模浸润性差;产生气泡难以排除和涂料流动性不好,粘度较大。为了保证铸件表面质量,必 Silica sol is a new type of water-based binder. Compared with ethyl silicate, it has the advantages of easy manufacture, easy to use, large amount of ethanol can be saved, non-flammable, long shelf life of coating, high sintering strength of shell type and good heat deformation resistance. Therefore, in recent years, Casting investment casting increasingly widely used. However, silica sol, a water-based binder, also brings with it two unavoidable drawbacks, namely the poor coating consistency and slow drying of the coatings formulated therewith. In particular, in terms of coatability, the silica sol has a large surface tension and poor wettability to the wax pattern. It is difficult to eliminate air bubbles and paint miscibility and viscosity. In order to ensure the quality of the casting surface, must