A kind of concave polyhedron streamline suspension lightweight filter material, preparation method and application

A light-weight filter material and concave polyhedron technology, applied in separation methods, chemical instruments and methods, loose filter material filters, etc., can solve the problems of poor compression permanent deformation, easy hardening and flattening of cylinders, and difficulty in cleaning, etc. problems, achieve low compression set, reduce head loss, and reduce resistance

Active Publication Date: 2022-04-29
北京清源华建环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN201820670891.5 discloses a filter material for a suspension fast filter used to treat overflow sewage in a combined system. The filter material is made of ethylene-vinyl acetate copolymer (EVA) foam plastic, and its shape is multi-column. , and each cylinder has edges and corners, so that it can be squeezed into layers with the surrounding filter material in the pool during filtration, so that a CSO filter layer floating on the sewage to be filtered is formed in the suspended fast filter tank. Although this filter material It can retain most of the particulate pollutants in the sewage, but this multi-column filter material has dead angles and is not easy to clean. The accumulation of SS will cause the filtration effect to deteriorate, and the multi-column shape of ethylene-vinyl acetate will last for a long time. Under the action of strong mutual extrusion stress, the cylinders are easy to harden and flatten, that is, the compression set is poor, resulting in a large number of gaps between the cylinders, causing a large amount of COD and SS to be discharged into the water body

Method used

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  • A kind of concave polyhedron streamline suspension lightweight filter material, preparation method and application
  • A kind of concave polyhedron streamline suspension lightweight filter material, preparation method and application
  • A kind of concave polyhedron streamline suspension lightweight filter material, preparation method and application

Examples

Experimental program
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Effect test

preparation example 1

[0052] 1) EVA hydrolysis

[0053] Dissolve 60 parts of EVA in 80 parts of toluene, heat up to reflux state, add 65 parts of ethanol solution dissolved with sodium hydroxide, the concentration of sodium hydroxide is 2mol / L, react at constant temperature for 5h, add 15wt% hydrochloric acid dropwise to pH to 7, cooled to room temperature, poured the reaction liquid into 300 parts of water, stirred until no more precipitates were precipitated, dried the precipitates in vacuum at 80°C, and crushed to 80 μm, washed with water, filtered, and dried again. Repeat this twice to obtain dry powder for later use; The test hydrolysis degree is 96.0%.

[0054] 2) Esterification of EVA hydrolyzate

[0055] Dissolve the dry powder obtained in step 1) in 80 parts of toluene, add 13.4 parts of alanine and 31 parts of p-toluenesulfonic acid, heat up to 110°C and keep stirring until no more water condenses and separates out, then naturally cool to room temperature, Slowly pour the reaction solut...

preparation example 2

[0057] The rest are the same as in Preparation Example 1, except that 13.4 parts of alanine are replaced by 11.25 parts of glycine.

[0058] Using phenolphthalein as an indicator, use 0.1mol / L HCl solution to titrate the reaction mixture in step 1) cooled to room temperature until the phenolphthalein changes color. At the same time, do a blank experiment, record the volume of hydrochloric acid solution used for titration, and repeat three times to calculate the consumption of hydrochloric acid solution The average value of the volume, refer to the following formula to calculate the consumption of VA in EVA, that is, the degree of hydrolysis of VA in EVA.

[0059]

[0060] Among them, M is the relative molecular mass of VA; C is the concentration of hydrochloric acid used in titration, mol / L; V0 is the volume of hydrochloric acid consumed by the blank sample, ml; V is the volume of hydrochloric acid consumed in titration, ml; VA 0 is the total content of VA in EVA; G is the ...

Embodiment 1

[0063] S1. Add 30 parts of the modified copolymer prepared in Preparation Example 1 and 70 parts of ethylene-vinyl acetate copolymer to a double-roll mill with a preheating temperature of 120°C, knead for 3 minutes, and add 5.92 parts of 1,3 - Bis(3-glycidyl etheroxypropyl) tetramethyldisiloxane, 2.08 parts of epoxy-terminated silicone oil, kneading for 2 minutes, adding 5 parts of azodicarbonamide, 1.5 parts of DCP, 3 parts of zinc oxide , 8 parts of calcium stearate continue to knead for 5 minutes, 3 parts of talcum powder, and the thin slices are 1.7mm thick slices, which are cut to obtain pellets;

[0064] S2. Put the pellets obtained in the previous step into a 5mm×5mm×5mm mold preheated to 160°C in advance, foam at 160°C for 6 minutes, and the molding pressure is 10MPa, open the mold, and then place it in a mold at 80°C Heat treatment in a drying oven for 6 hours, take it out and place it at room temperature for 24 hours to obtain a lightweight filter material of 5mm×5mm...

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Abstract

The invention relates to a concave polyhedron streamlined suspended lightweight filter material, a preparation method and an application. The filter material is a cuboid, the six faces of the cuboid are concave surfaces, and each concave surface is formed by splicing four inclined triangular planes with each other. The preparation raw materials of the material include amino acid-modified ethylene-vinyl acetate copolymer and a cross-linking agent, and the cross-linking agent is epoxy siloxane. In the present invention, the amino acid and the hydrolyzed ethylene-vinyl acetate are used for esterification reaction, and the modified ethylene-vinyl acetate copolymer with active amino groups is obtained and the epoxy-based silicone oil is cross-linked to form a three-dimensional network structure. ‑Vinyl acetate copolymer and ethylene‑vinyl acetate copolymer are used as the base material to prepare the filter material. The crosslinking reaction between the bridging agent and the copolymer, the crosslinking agent and the modified ethylene vinyl acetate copolymer occurs simultaneously. , the obtained lightweight filter material with three-dimensional network structure has low compression set, and can quickly filter the initial rainwater with lasting and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of sewage filter materials, and in particular relates to a concave polyhedral streamlined suspended lightweight filter material, a preparation method and an application. Background technique [0002] Initial rainwater is the rainwater at the beginning of rainfall. Generally, it refers to the precipitation that has formed surface runoff with a thickness of 10-15mm on the ground. In the early stage of rainfall, the rainwater dissolved a large amount of polluting gases such as acid gas, automobile exhaust, and factory exhaust gas in the air. Higher, even exceeding the pollution level of ordinary urban sewage. Once the initial rainwater carrying a large amount of pollutants is discharged into the receiving water bodies of urban rivers and lakes, the ecosystems of rivers and lakes will be destroyed, which will not only endanger various organisms in the water, but also have a great impact on human health. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D39/04B01D24/00B01D24/46C08J9/00C08J9/10
CPCB01D39/04B01D24/008B01D24/4631B01D24/001C08J9/103C08J9/0061C08J2203/04C08J2323/08C08J2423/36C08J2483/04
Inventor 范永超陈亮刘林刘树模
Owner 北京清源华建环境科技有限公司
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