A centrifugal granulating method for producing a sealing material, a product and an application thereof

Abstract

The invention aims at providing a preparation method of making sealant materials. For example, the invention provides a sealant element for some parts needing to be sealed such as oxygen sensors of a core part in the electronic jet system of a vehicle, etc. The sealant element is made from inorganic nonmetal materials that are temperature-resistant, easy to fill, such as 1250 mesh talcum powder. Talcum powder particles needed by the sealant element is made by using centrifugal granulation technology. A technology test is made to confirm the parameter in the centrifugal granulation technology and gain the tiny diameter ball. The sphericity of the ball is distinct and good, which can stand certain intensity. The intensity and density of the little ball can be enhanced by increasing the time of making the ball. The final determined technology parameter can guarantee that the crushing power of the sealant element and the dispersion condition of balls can satisfy the demand for the parts needing to be sealed such as an assembly sensor, etc.

Description

technical field [0001] The invention relates to a preparation method of a sealing material and its product and application, in particular to a preparation method of a talcum powder-based sealing material. Background technique [0002] There are many devices in modern industries that require seals, and the seals must have the characteristics of good airtightness. As in the oxygen sensor (such as figure 1 As shown), the seal must have good air tightness, high temperature resistance and good insulation. Sealing is performed by crushing prefabricated ring-shaped solid pieces with a certain strength and thickness at the sealing position instead of directly adding powder at the sealing position. While meeting the shape, size, crushing force, etc., the seal Whether it can be uniform and fine particles during crushing has a very important impact on the sealing effect. Therefore, it is necessary to develop a new type of sealing material with good airtightness and high filling capa...

AI Technical Summary

Problems solved by technology

[0005] Stirring granulation molding equipment has a simple structure, large single machine output, and the formed granules are easy to dissolve quickly and have strong wettability. The disadvantage is that the uniformity of the granules is not good and the strength of the formed granules is low; The efficiency is the highest, but the granules produced are relatively loose, and the true sphericity and surface finish are very poor. It is suitable for the manufacture of granules with low requirements or pre-processing for other preparations; the granules produced by spray drying granulation contain moisture The gap left by evaporation is also relatively loose. Although it can be produced continuously, the output is low and the equipment is huge. At the same time, it needs a series of processing equipment such as extraction, filtration, and concentration in the early stage. It is suitable for the manufacture of instant food or Chinese medicine preparations; pressure In the forming granulation method, the molding method can produce larger agglomerates, and the produced materials also have considerable mechanical strength. The disadvantage is that the scope of application of the equipment is small, and it is not easy to demould some materials; in the pressure forming granulation method, extrusion The pressure method has the advantages of strong adaptability, large output, uniform particle size, good particle strength, and high granulation rate; in the pressure forming granulation method, the extrusion spheronization granulation method is simple and practical, with high particle density and true sphericity. The surface finish depends on the rotating speed of the turntable and the time of rounding, and there is a slight convex and concave phenomenon; the advantage of the spray and disperse mist method is that the granulation process and the drying process of the material are carried out at the same time, and the disadvantage is that the particle strength is low and the particle size is small; hot melting The application of molding method in China's powder industry has become more common, and the technology is more mature.

The particles produced by the centrifugal granulation method are uniform and dense, with high surface finish and true sphericity, and can produce high-quality spherical particles with a high pass rate. It is an ideal method for mass production of high-density, small-diameter particles. Centrifugal granulation Since the machine came out in the 1970s, it has been modified several times, and many models have been put on the market. At present, the technology of this model in China is mature, the effect is good, and the cost is not high. It has been widely used in the pharmaceutical industry and pellet manufacturing research.

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