A method for rapid preparation of micron-scale microplastics in the laboratory

A micron-scale, micro-plastic technology, applied in the field of micro-plastics, can solve the problems of long preparation process time, difficulty in meeting the experimental requirements of micro-plastic particle size, particle size can not be reached, etc., to achieve the effect of short preparation process time

Active Publication Date: 2022-06-17
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current laboratory preparation of microplastics mostly adopts artificial methods. The whole preparation process takes a long time, the output is low, the efficiency is poor, and there are problems such as particle size not reaching the range of microplastics.
Although it has been reported that microplastics can be prepared by simple physical grinding, shearing and other methods, these methods take a long time, and the particle size of the prepared microplastics is difficult to meet the experimental requirements.
Moreover, due to the small particle size of the prepared microplastics, severe agglomeration of the splits occurred after a period of time, resulting in a larger particle size; although the grinding method will gradually disperse the agglomerates, these dispersions Some of the particles will form agglomerates again, and the particle size will become larger

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The present embodiment provides a method for rapidly preparing micron-scale microplastics in a laboratory, comprising the following steps:

[0025] Step 1. Cut the plastic waste into small pieces; the tool used for cutting is one of scissors and a small electric cutter; the length of the plastic waste after cutting is 4cm, the width is 2cm, and the thickness is 0.5cm;

[0026] Step 2, place in liquid nitrogen for freezing treatment for 4min;

[0027] Step 3. Soak the frozen plastic waste in silicone oil for 10s;

[0028] Step 4, place the ultrasonic in the ultrasonic crusher, and the ultrasonic power is 400W; the ultrasonic time is 4min;

[0029] Step 5. Add the ultrasonic plastic waste into a mortar, and then add liquid nitrogen to grind and pulverize, and the grinding time is 5min;

[0030] Step 6, sieve the ground and pulverized materials, and the sieve used for sieving has an aperture of 200 μm, that is, micro-scale microplastics of 50-200 μm are obtained.

Embodiment 2

[0032] The present embodiment provides a method for rapidly preparing micron-scale microplastics in a laboratory, comprising the following steps:

[0033] Step 1. Cut the plastic waste into small pieces; the tool used for cutting is one of scissors and a small electric cutting machine; the length of the plastic waste after cutting is 3cm, the width does not exceed 2cm, and the thickness does not exceed 0.6cm;

[0034] Step 2, place in liquid nitrogen for freezing treatment for 3min;

[0035] Step 3. Soak the frozen plastic waste in silicone oil for 5s;

[0036] Step 4, place the ultrasonic in the ultrasonic crusher, the ultrasonic power is 300W; the ultrasonic time is 5min;

[0037] Step 5. Add the ultrasonic plastic waste into a mortar, and then add liquid nitrogen to grind and pulverize, and the grinding time is 6 minutes;

[0038] Step 6, sieving the ground and pulverized materials, and the sieve mesh used for sieving has a pore size of 100 μm, that is, micro-scale microp...

Embodiment 3

[0040] The present embodiment provides a method for rapidly preparing micron-scale microplastics in a laboratory, comprising the following steps:

[0041] Step 1. Cut the plastic waste into small pieces; the tool used for cutting is one of scissors and a small electric cutter; the length of the plastic waste after cutting is not more than 2cm, the width is not more than 1cm, and the thickness is not more than 0.8 cm;

[0042] Step 2, placed in liquid nitrogen for freezing treatment for 5min;

[0043] Step 3. Soak the frozen plastic waste in silicone oil for 20s;

[0044] Step 4, place the ultrasonic in the ultrasonic crusher, the ultrasonic power is 500W; the ultrasonic time is 3min;

[0045] Step 5. Add the ultrasonic plastic waste into a mortar, and then add liquid nitrogen to grind and pulverize, and the grinding time is 3 minutes;

[0046] Step 6, sieving the ground and pulverized materials, and the aperture diameter of the screen used for sieving is 900 μm, that is, 50...

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PUM

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Abstract

The invention discloses a method for rapidly preparing micron-scale microplastics in a laboratory. The method comprises the following steps: step 1, cutting plastic waste into small pieces; step 2, placing it in liquid nitrogen for freezing treatment; step 3, Soak the frozen plastic waste in silicone oil for 5-20 seconds; step 4, put it in an ultrasonic crusher for ultrasonication; step 5, add the ultrasonic plastic waste into a mortar, then add liquid nitrogen, and grind and pulverize; step 6, Sieve the ground and pulverized materials to obtain micron-sized microplastics; this method takes a short time in the whole preparation process, and can obtain microplastics whose particle size can reach the micron level; after a period of time, no agglomeration occurs and can still meet the micron-level requirements. particle size requirements.

Description

technical field [0001] The invention relates to the technical field of microplastics, in particular to a method for rapidly preparing micron-scale microplastics in a laboratory. Background technique [0002] Microplastics usually refer to plastic fragments less than 5mm in size, which can be divided into two categories: primary microplastics and secondary microplastics. Primary microplastics refer to industrial products of plastic particles discharged into the water environment through rivers, sewage treatment plants, etc., such as microplastic particles contained in cosmetics, or plastic particles and resin particles as industrial raw materials; secondary microplastics refer to Large plastic waste is a plastic particle formed by physical, chemical and biological processes that cause fragmentation and reduction in volume. Due to the wide use of plastics, a large number of microplastics are caused to flow into lakes and oceans with surface runoff. On the one hand, it directl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C21/00B02C23/00B02C23/16
CPCB02C21/00B02C23/00B02C23/16B02C2023/165
Inventor 陈煦阳张怀胜
Owner YANGTZE UNIVERSITY
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