Solvent separation method for coating and soft rubber

Abstract

The invention discloses a solvent separation method for a coating and soft rubber. The method comprises steps as follows: (1) a soft rubber sample sheared into a piece is weighed; (2) the sample is placed in a paint coating dissolution extraction device and an extracting agent is added for dissolution; (3) the paint coating dissolution extraction device is placed in an ultrasonic water bath for ultrasonic treatment, and an extracted sample and an extracting agent solution with paint dissolved are obtained; (4) the extracted sample is weighed; (5) the extracting agent solution is evaporated to dryness and placed in a graphite digester, aqua regia is added and evaporated to dryness, and separated paint is obtained; (6) the paint is cooled to the room temperature to be measured after volume metering. With the adoption of the method, solvent extraction separation can be performed on the paint coating and the soft rubber effectively, independence of the two different substances, namely, the paint coating and the soft rubber, can be guaranteed, and the detection requirement for plastic toys at home and abroad can be met completely. The method has the advantages that the process is simple, the operation is convenient, secondary pollution can be avoided and the like.

Description

technical field [0001] The invention relates to the field of toy safety detection, in particular to a method capable of separating a paint coating on a soft rubber substrate. Background technique [0002] Currently, the toys sold on the market, according to the CPSIA H.R. 4040 Act of the Consumer Product Safety Commission (CPSC), the 91 / 338 / EEC Directive issued by the European Union and the Restriction of the use of certain Hazardous Substances (RoHS) Directive, as well as the national toy safety standard GB6675 .4-2014, the content of toxic and harmful elements in the accessible paint coating attached to the surface of the toy must be limited. The aforementioned standard-related methods only refer to the appropriate method for obtaining paint coatings from sample substrates. For hard substrates that are easier to scrape off, the general conventional method is to directly scrape the paint coating on the surface with a blade; but for soft rubber substrates that are difficult...

AI Technical Summary

Problems solved by technology

For hard substrates that are easier to scrape off, the general conventional method is to directly scrape the paint coating on the surface with a blade; but for soft rubber substrates that are difficult to scrape off (generally polypropylene, polyethylene, etc. Plastics with relatively low surface hardness), the method of obtaining the paint coating on the surface does not mention the specific operation methods and steps

Therefore, in the prior art, there is no method for completely separating the paint coating and the soft glue on the soft glue substrate according to the different chemical properties of the paint coating and the soft glue, so as to realize the separation of different types of sample units. Accurate detection effect

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