Metal, ceramic powder and polymer mixture used for manufacturing metal and ceramic products and method for hydrolyzing and removing polymer from moldings

Abstract

The invention discloses a polymer material, metal and ceramic powder mixture used for manufacturing metal, ceramic and compound (mixed) material (material component) products and a method for hydrolyzing and removing polymer materials from moldings. The mixture comprises the following materials in volume ratio: 40-70% of material components and 60-30% of polymer material adhesives (being composed of the following materials in mass ratio: 50-95% of main materials that can be hydrolyzed and removed at a relatively low temperature, 46-4.5% of ancillary materials that can be thermally removed at a relatively high temperature and 4-0.5% of additives); the mixture is used for molding by mixing, banburying, squeezing and granulating; main polymer materials are hydrolyzed and removed from molded green bodies at a relatively low temperature, auxiliary polymer materials and additives are thermally removed at a relatively high temperature, and the green bodies are sintered to obtain target products. The polymer material and the method have the advantages that adhesive removing is low in temperature and short in time, and the catalyst is water; removed materials are reusable by recycling, condensing and separating, and are environment-friendly; after molding, pouring gate and flow passage rejecting materials can be repeatedly recycled; the product cost is lowered.

Description

technical field [0001] The invention relates to a polymer material, metal and ceramic powder mixture for manufacturing metal, ceramic and composite material products. The mixture is suitable for powder injection molding (compression molding, mold casting), and the molded product is hydrolyzed to remove polymer materials to obtain metal, ceramic and composite material products. Background technique [0002] Powder injection molding is a new near-net-shaping manufacturing technology compared to traditional manufacturing methods, and is especially suitable for manufacturing micro-sized, complex structural shapes, and high-volume products. [0003] The research and development of powder injection molding technology at home and abroad has a history of more than 20 years, and some binder systems composed of polymer materials and their corresponding removal methods and equipment have been formed. For example: the wax-based bonding system and its removal technology and equipment th...

AI Technical Summary

Problems solved by technology

[0004] As far as the current popular wax-based and formaldehyde-based binder systems are concerned, it is impossible to recycle the removed polymer materials

When the wax-based binder is removed, even if it is recovered, the recovered composition cannot be recycled, and sometimes it is even discharged in a straight line; whether the polyoxymethylene system is continuously thermally removed or acid-catalyzed The premise is to depolymerize formaldehyde into gaseous formaldehyde, and then burn the formaldehyde, which not only wastes resources, but also increases carbon emissions to the environment. Acid catalysis is even more harmful to the environment, and has higher requirements for equipment.

[0005] Furthermore, injection molding is mainly used to manufacture micro-sized products. Each injection is several times or even dozens of times the weight of the product due to the rejection of gates and runners. After a certain number of cycles of kneading and injection, the rejected material in the runner will be depolymerized and cannot be mixed and used again, resulting in a lot of waste