Preparation method of modified aluminium silicate ceramic fiber blanket for microwave expansion

Abstract

The invention discloses a preparation method of a modified aluminium silicate ceramic fiber blanket for microwave expansion. The preparation method comprises the following steps of: firstly, dissolving polyether sulfone and polyvinylpyrrolidone into N,N-dimethylacetamide solvent to prepare polyether sulfone solution; then conducting ultrasonic oscillation on aluminium oxide powder with average particle size of 1.5 mu m so that the aluminium oxide powder can be dispersed in the polyether sulfone solution to prepare mixed aluminium oxide-polyether sulfone solution; then dip-coating the mixed aluminium oxide-polyether sulfone solution into the aluminium silicate ceramic fiber blanket sold in the market; and naturally airing at atmospheric temperature. The prepared modified aluminium silicate ceramic fiber blanket is high in tensile strength and bending strength, excellent in microwave permeation property, and capable of meeting the high-temperature-resistant requirement of the expansion procedure. In addition, the preparation method has the advantages of being simple and convenient to operate, and low in cost.

Description

technical field [0001] The invention relates to a preparation method of a microwave puffed composite material, in particular to a preparation method of a modified aluminum silicate ceramic fiber blanket used for microwave puffing. Background technique [0002] Expanded graphite is a new type of soft carbon material. It not only has all the excellent properties of natural graphite, such as heat resistance, radiation resistance, corrosion resistance, electrical conductivity, and self-lubrication, but also has light weight, softness, and durability that natural graphite does not have. Porous adsorption, compression rebound and other characteristics. Therefore, expanded graphite, as an excellent engineering material, has been widely used in petrochemical, electric power, metallurgy, machinery and other industries. [0003] At present, the industrial production of expanded graphite mostly adopts the high-temperature expansion process, that is, the expandable graphite is expanded...

AI Technical Summary

Problems solved by technology

This organic conveyor belt can meet the requirements of microwave transmission, but it cannot withstand the high temperature of 900°C

A research has reported an expansion box made of aluminum silicate, which can meet the process requirements of instantaneous high temperature, but its strength is low, the toughness is poor, and it is easy to be damaged during use, so it cannot effectively guarantee the continuity of expanded graphite production.

[0006] Aluminum silicate ceramic fiber blanket has low thermal conductivity and small heat capacity. It has the advantages of high temperature resistance, good chemical stability, and excellent thermal stability. It can meet the requirements of high temperature resistance and microwave transmission as a conveyor belt material; Surface needling forming process, so the tensile strength and bending strength are poor, and it cannot be directly laid on the conveyor belt to meet the requirements of continuous operation of the puffing equipment

[0007] Polyethersulfone is a thermoplastic polymer material with excellent comprehensive properties. It has stable physical and chemical properties, good microwave permeability, excellent high temperature creep resistance and excellent heat resistance, and can still maintain its properties under high temperature conditions. Stable physical and chemical properties, but its resistance to high temperatures above 300°C is limited