Preparation method of polyformaldehyde self-lubricating sieve plate

A polyoxymethylene and self-lubricating technology, applied in the field of preparation of polyoxymethylene self-lubricating sieve plates, can solve the problems of low lubrication effect, easy breakage of polyoxymethylene, unusable use, etc., and achieves fast crystallization speed, easy stress concentration, and improved surface hardness. Effect

Inactive Publication Date: 2020-09-18
安徽屹翔滤材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018]The first step is to prepare microcapsule fillers: first prepare microcapsule fillers with solid chlorinated paraffin as the capsule core and formaldehyde-aniline polymer as the capsule shell, dissolve 130 parts of distilled water and 30 parts of formaldehyde into the reaction kettle, and use carbonic acid Adjust the pH to 9.0 with the sodium solution, add aniline according to the molar ratio of formaldehyde:aniline 1:0.75, raise the temperature to 60°C at a rate of 2°C / min, keep it warm for 1h, quickly cool down to 40°C, add 60 parts of distilled water to dilute , to obtain a prepolymer, then take chlorinated paraffin and heat and melt it according to the mass ratio of core-to-wall ratio of 1.5:1, add emulsifier sodium polystyrene sulfonate and emulsify at 1000r / min for 10min, during which the mass fraction is added dropwise Continue to emulsify 0.5% polyvinylpyrrolidone aqueous solution for 4 minutes to obtain a stable chlorinated paraffin emulsion, add the prepolymer t...

Embodiment 2

[0020] The first step is to prepare microcapsule fillers: first prepare the microcapsule fillers with solid chlorinated paraffin as the capsule core and formaldehyde-aniline polymer as the capsule shell. The preparation method is: 20 parts of formaldehyde and 120 parts of distilled water are added to the reaction kettle , adjust the pH to 8.5 with sodium carbonate solution, add aniline according to the molar ratio of formaldehyde:aniline 1:0.75, raise the temperature to 50°C at a rate of 2°C / min, keep it warm for 0.5h, quickly cool down to 40°C, add 50 distilled water to obtain a prepolymer, and then take chlorinated paraffin and heat and melt it according to the mass ratio of core wall ratio of 1.5:1, add emulsifier sodium polystyrene sulfonate and emulsify at 1000r / min for 5min, gradually Add dropwise 0.5% polyvinylpyrrolidone aqueous solution and continue to emulsify for 2 minutes to obtain a stable chlorinated paraffin emulsion. Add the prepolymer to the prepared chlorinate...

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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...

Claims

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Application Information

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IPC IPC(8): C08L59/04C08L9/00C08L91/06C08L61/22C08K5/13C08K5/548C08K5/378B01J13/18B29D28/00B07B1/46
CPCB01J13/18B07B1/4618B29D28/00C08K2201/014C08L59/04C08L2205/035C08L2205/08C08L2205/14C08L2205/22C08L2205/24C08L2312/00C08L9/00C08L91/06C08L61/22C08K5/13C08K5/548C08K5/378
Inventor 丁好奇韩同清李金成王体亚
Owner 安徽屹翔滤材有限公司
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