Preparation method of polyformaldehyde self-lubricating sieve plate

Abstract

The invention relates to the technical field of screen production, in particular to a preparation method of a polyformaldehyde self-lubricating sieve plate. Raw material source is wide, and the preparation method is simple and convenient. Polyformaldehyde is modified by taking microcapsule filler and butadiene rubber latex as raw materials, and the self-lubricating property and the toughness of the polyformaldehyde are improved. The prepared polyformaldehyde self-lubricating sieve plate has the advantages of antifriction, self-lubrication, fatigue resistance, stable size and the like. The sieve plate is simple to process and form, long in service life, free of blockage of holes in the surface of the sieve plate, high in sieving efficiency, capable of effectively preventing adhesion of wetfine particles, and suitable for sieving and grading of the wet fine particles. A sintering compression molding process is adopted, and the sieve plate is accurate in aperture, high in sieving quality, high in strength, impact-resistant, wear-resistant, high in tensile strength and high in bearing capacity.

Description

technical field [0001] The invention belongs to the technical field of sieve plate production, and in particular relates to a method for preparing a polyoxymethylene self-lubricating sieve plate. Background technique [0002] The sieve plate exists not only in the crushing equipment, but also in the screening equipment. It is an indispensable part of the crushing and screening. The metal sieve plate represented by the stainless steel sieve plate can be used as a metal mesh structural element for screening and filtration. It can be made into steel screening and filtering devices of various shapes, and with the development of the non-metallic material industry, new materials are provided for the manufacture of high-quality and high-efficiency new screen surfaces. At present, the non-metallic screen surfaces used at home and abroad are made of natural rubber, polyurethane and nylon. However, the above materials all have their own advantages and disadvantages and cannot be wide...

AI Technical Summary

Problems solved by technology

Polyoxymethylene is a milky white opaque crystalline linear thermoplastic resin with good comprehensive performance and colorability, high elastic modulus, high rigidity and hardness, specific strength and specific rigidity close to metal; tensile strength, bending strength , Excellent creep resistance and fatigue resistance. From the perspective of molecular structure, the main chemical bond C-O in the main chain of polyoxymethylene is larger than the bond energy of C-C, and the bond length is shorter. The atomic density of polyoxymethylene along the direction of the molecular chain is large. The surface hardness is high. During the process of friction and sliding, the macromolecules are easy to be oriented along the friction direction and strengthened. However, the sieve plate is always in an alternating state of dry and wet, and the pure polyoxymethylene resin is more sensitive to notch impact. During the use of the sieve plate Due to vibration and material impact, pure polyoxymethylene is easily damaged or even destroyed, and the self-lubricating effect is greatly reduced due to the sensitivity of the gap during the wear process, which makes it impossible to use in sieve plates and screening equipment. There are few effective products and related technologies of polyoxymethylene sieve plates. Microcapsules refer to a microscopic container or package with a polymer or inorganic wall.