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Cleaing method of polyurethane filter leaf or filter core

A technology of filter element and filter sheet, which is applied in the fields of filament forming treatment, textile and paper making, fiber treatment, etc., and can solve the problems of high cost, long processing time, and large energy consumption.

Inactive Publication Date: 2005-12-28
上海康维科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] We (application number 031421407) have used catalytic alcoholysis method to clean polyether polyurethane filter sheet or filter element, and obtained a removal rate as high as 99.8%.

Method used

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  • Cleaing method of polyurethane filter leaf or filter core
  • Cleaing method of polyurethane filter leaf or filter core
  • Cleaing method of polyurethane filter leaf or filter core

Examples

Experimental program
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specific Embodiment approach

[0015] An efficient and energy-saving cleaning method for filter discs or filter elements coated with polyurethane. It is characterized in that: the high-efficiency and energy-saving cleaning method of the polyurethane-stained filter sheet or filter core comprises the combination of the following steps: A, triethylene glycol cleaning is carried out at high temperature; B, oxidation cleaning is carried out in an aqueous solution containing an oxidant Carry out; C, soaping liquid is the aqueous solution of composite surfactant and builder; Washing; D, ultrasonic cleaning; drying; H, packing.

[0016] During the specific implementation of triethylene glycol cleaning, first place the filter sheet or filter element in a triethylene glycol furnace for alcoholysis at 240-280 degrees for 8-24 hours. The cleaning after alcoholysis with triethylene glycol includes rinsing, soaping, and water washing, and oxidation is carried out in an aqueous solution containing an oxidizing agent, and...

example 1

[0027] Example 1 (alcoholysis-hydrogen peroxide oxidation method):

[0028] Put the polluted filter in a triethylene glycol furnace, heat it up to 250°C for 23 hours, take it out after cooling down, rinse it with water, put it in a soaping furnace equipped with forced convection at 30°C, and soap it for 5 hours; then Water washing; triethylene glycol pretreatment can remove 97% of polyurethane, creating good conditions for subsequent catalytic alcoholysis. After the pre-treated filter sheet or filter element is drained, put it in hydrogen peroxide solution, raise it to 100°C, and keep it warm for 2 hours; cool down, take it out and rinse it; then enter the soaping furnace for soaping and keep it warm for 5 hours; then use pure water Rinse well; drain. Ultrasonic treatment in 3% phosphoric acid solution; on the one hand, to further shake out impurities, and on the other hand, to remove inorganic impurities and complexes formed on the surface of the filter element. Finally, ri...

example 2

[0029] Example 2 (alcoholysis-hydrogen peroxide oxidation method):

[0030] Put the polluted filter element in a triethylene glycol furnace, heat it up to 270°C for 13 hours, take it out after cooling down, rinse it with water, put it in a soaping furnace equipped with forced convection at 70°C, and soap it for 2 hours; Then wash with water; triethylene glycol pretreatment can remove 98% of polyurethane, creating good conditions for subsequent catalytic alcoholysis. After the pre-treated filter sheet or filter core is drained, put it in hydrogen peroxide solution, raise it to 90°C, and keep it warm for 4 hours; cool it down to room temperature, take it out and rinse it; then enter the soaping furnace for soaping and keep it warm for 7 hours; Rinse well with pure water; drain. Ultrasonic treatment in 7% phosphoric acid solution; on the one hand, to further shake out impurities, and on the other hand, to remove inorganic impurities and complexes formed on the surface of the fil...

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Abstract

A wash method of filtering chip and filtering core polluted by polyurethane. It contains steps as follow. A. Use TEG to wash it at high temperature. B. Wash it in oxidant. C. Wash it in soaping solvent, the solvent of compound surface active agent and builder. D. Wash by supersonic wave. E. Gross detect by acetone. F. Evaluate effect of wash, including pop experience and cleanliness. G. Dry and pack it.

Description

Technical field: [0001] The invention relates to the technical field of cleaning components of polyurethane spinning equipment, in particular to a high-efficiency and low-energy-consumption cleaning method for a filter sheet or filter core coated with polyurethane. Background technique: [0002] The molding process of polyurethane (polyester) fiber is made by extruding the qualified polymer solution (melt) out of the fine spinneret holes, and then going through many post-treatment processes such as desolventization (cooling); in order to ensure the spinning It is carried out smoothly and continuously. Before spinning, the polymer must be strictly filtered to remove the gel and impurities generated from the production. The important task is the filter sheet of the rotary filter or the candle filter. filter element. [0003] The replaceable filter sheet in the rotary filter is divided into three layers. The first layer is a coarse-mesh flat-woven stainless steel mesh, the sec...

Claims

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Application Information

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IPC IPC(8): D01D1/10
Inventor 沈德兴张尧君
Owner 上海康维科技发展有限公司
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