Composite auxiliary agent for honeycomb ceramic forming

Abstract

A composite auxiliary agent for forming honeycomb ceramics, the parts by weight of each component are: 0.5-6 parts of polyvinyl alcohol; 1-10 parts of carboxymethyl cellulose sodium; 2-10 parts of hydroxypropyl methylcellulose; 1~10 parts of polyethylene glycol; 0.2~3 parts of sodium citrate; 0.5~5 parts of sodium tripolyphosphate. It can replace the molding aids that use tung oil or other oily esters as binders and lubricants widely used in the production of honeycomb ceramics, which can effectively solve the environmental pollution caused by the volatilization and decomposition of tung oil and other toxic and harmful gases during use. and damage to the operator's health. The amount of the composite additive is only 2%~5% of the total mass of the honeycomb ceramic raw material, which can be adjusted according to the size of the honeycomb ceramic product and the thickness of the honeycomb wall, and can meet the plastic extrusion molding process of various honeycomb ceramic products need. The composite additive is non-toxic and odorless in the production process, and does not produce harmful gases to the environment during the firing process.

Description

technical field [0001] The invention relates to material preparation technology, and further relates to a composite auxiliary agent for forming honeycomb ceramics. Background technique [0002] Honeycomb ceramics is a porous ceramic material with regular through-holes and thin-walled structures. It has been widely used in environmental protection and energy-saving fields such as automobile exhaust purification, high-efficiency heat storage in kilns, and chemical catalyst carriers. Because of its special pore structure, the mud is required to have high plasticity and high lubricity during extrusion. In order to make the mud pass through the mold smoothly and give it the ability to maintain a specific shape, lubricants, plasticizers and reinforcing agents need to be added to the mud. At present, tung oil is mainly used in the production of domestic honeycomb ceramics as a comprehensive additive for lubrication, plasticization and reinforcement, and its effect is better among ...

AI Technical Summary

Problems solved by technology

[0005] In the existing binders, plasticizers or lubricants for forming honeycomb ceramics that do not contain tung oil, there are generally two problems. One is that the amount of forming aids is relatively high, generally accounting for more than 6% of the total mass of honeycomb ceramic raw materials , some as high as 30%. Although the addition of a large amount of forming aids meets the requirements of the forming process of most honeycomb ceramic products, it increases the forming moisture of the honeycomb ceramic mud, resulting in the drying shrinkage and firing shrinkage of the honeycomb ceramic body. Increase, the probability of defects such as deformation and cracking increases during drying and firing, and because a large amount of molding aids decompose and escape during firing, especially when the decomposition products are incompletely burned at low temperatures, it will cause environmental pollution. The density and strength of honeycomb ceramic products after firing are also low; second, for some thin-walled and large-sized honeycomb ceramic products, problems such as deformation and cracking are prone to occur, and the product qualification rate is low

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