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

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...

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