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Preparation method of polydimethylsiloxane composite sponge capable of continuously and efficiently filtering PM

A technology of polydimethylsiloxane and composite sponge, which is applied in the direction of separation methods, dispersed particle filtration, chemical instruments and methods, etc., can solve the problems of narrow application range, poor continuous performance and mechanical properties, and achieve simple preparation process , short cycle, low pressure drop effect

Pending Publication Date: 2022-06-28
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing gas filter materials such as poor continuous performance and mechanical properties and narrow application range, and to provide a method for preparing a polydimethylsiloxane composite sponge that can continuously and efficiently filter PM. The process is simple, and the obtained composite sponge has excellent mechanical properties, long-term high-efficiency filtration performance, and still has excellent performance in harsh environments such as high temperature and high humidity

Method used

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  • Preparation method of polydimethylsiloxane composite sponge capable of continuously and efficiently filtering PM
  • Preparation method of polydimethylsiloxane composite sponge capable of continuously and efficiently filtering PM
  • Preparation method of polydimethylsiloxane composite sponge capable of continuously and efficiently filtering PM

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preparation example Construction

[0031] A kind of preparation method of the polydimethylsiloxane composite sponge of continuous high-efficiency filtering PM, its concrete steps are as follows:

[0032] (1) Preparation of PDMS sponge by sacrificial template method

[0033] Take an appropriate amount of citric acid monohydrate granules and thoroughly grind them into powder in a mortar, then fully stir the citric acid monohydrate powder and polydimethylsiloxane to make them evenly mixed, and then transfer them to the desired mold, and press repeatedly. After exhausting the air, it was placed in an oven at 150 °C to cure overnight, then placed in deionized water, and citric acid monohydrate was dissolved by ultrasound, and then dried in an oven at 60 °C to obtain a three-dimensional porous PDMS sponge; the citric acid monohydrate used and the The mass ratio of PDMS is 3-6:1;

[0034] (2) PDA@PDMS composite sponge prepared by self-polymerization of dopamine hydrochloride

[0035] Dopamine hydrochloride (DA) and ...

Embodiment 1

[0042] This embodiment prepares a polydimethylsiloxane (PDMS) composite sponge that continuously and efficiently filters PM under harsh environments such as high temperature and high humidity according to the following steps:

[0043] Step 1: Preparation of PDMS sponge by sacrificial template method

[0044] Take an appropriate amount of citric acid monohydrate granules and grind them thoroughly in a mortar to powder, then mix 3 parts by weight of citric acid monohydrate powder and 1 part by weight of polydimethylsiloxane fully to make it evenly mixed and then transfer to the desired In the mold, after repeated pressing to discharge air, it was placed in a 150°C oven to cure overnight, then placed in deionized water, and citric acid monohydrate was dissolved by ultrasound, and then dried in an oven at 60°C to obtain a three-dimensional porous PDMS sponge;

[0045] Step 2: Self-polymerization of dopamine hydrochloride to prepare PDA@PDMS composite sponge;

[0046] Dopamine hyd...

Embodiment 2

[0050] The soaking in step 3 of Example 1 was actually replaced by 4h, and other operations were as in Example 1 to obtain ZIF-8@PDA@PDMS composite sponge.

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Abstract

The invention discloses a preparation method of a polydimethylsiloxane (PDMS) composite sponge capable of continuously and efficiently filtering PM, which comprises the following steps: preparing a PDMS sponge by a sacrificial template method, then putting the PDMS sponge into a dopamine hydrochloride solution, and preparing a PDA-coated PDMS composite sponge by auto-polymerization; and soaking the obtained PDA (at) PDMS composite sponge in a mixed solution of 2-methylimidazole and zinc nitrate hexahydrate, so as to prepare the ZIF-8 (at) PDA (at) PDMS composite sponge. The preparation process is simple, the cost is low, the obtained ZIF-8 (at) PDA (at) PDMS composite sponge still has extremely high filtering performance under severe environments such as high temperature and high humidity due to the thermal stability and hydrophobicity, the shape is controllable, the mechanical performance is excellent, and the application range is greatly widened.

Description

technical field [0001] The invention belongs to the field of material chemical industry, and in particular relates to a preparation method of a polydimethylsiloxane (PDMS) composite sponge capable of continuously and efficiently filtering particulate matter (PM) under harsh environments such as high temperature and high humidity. Background technique [0002] With the increasing improvement of people's material living standards, automobiles have become an indispensable tool for every household. With the sharp increase in the number of cars, the exhaust emissions generated by cars all the time during the driving process follow; in addition, there are also a large number of particulate matter-rich emissions caused by industrial production, daily power generation and other activities. gas emissions. Particulate matter pollution in the air can affect visibility, which in turn affects people's quality of life; particles with smaller particle sizes can even cause serious harm to ...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30B01D46/30
CPCB01J20/26B01J20/22B01J20/0244B01J20/28057B01J20/28078B01D46/30
Inventor 赖跃坤郝原野黄剑莹蔡伟龙
Owner FUZHOU UNIVERSITY
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