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Method for reducing heavy metal content of ABS plastic

A technology for ABS plastics and heavy metals is applied in the field of reducing the heavy metal content of ABS plastics, and achieves the effects of short time, simple technical solution, environmental protection, and easy control of process conditions.

Pending Publication Date: 2020-01-31
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above scheme shows that the zone smelting technology is still limited to the field of impurity removal of small molecular weight matrix materials, and the molecular weight of impurities is equivalent to that of the matrix

Method used

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  • Method for reducing heavy metal content of ABS plastic
  • Method for reducing heavy metal content of ABS plastic
  • Method for reducing heavy metal content of ABS plastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take an ABS plastic sample with a diameter of 0.5 cm and place it in a glass tube, clamp and fix the glass tube horizontally with a clamp, and continuously inject nitrogen gas into it, set the heating device on a horizontal automatic slide rail, and place a heating ring with a lateral width of 5 cm Set it on one end of the spline, set the heating temperature to 260°C, set the moving speed of the slide rail to 1mm / s, and circulate the melting 20 times. After the completion, take samples from the front, middle, and end of the obtained spline, and use ICP to detect the lead content in it. , and record the results in Table 1.

Embodiment 2～ Embodiment 9

[0032] The same method as in Example 1 is used to carry out the smelting treatment in the circular area of ​​the sample bar, and the process parameters are changed. The resulting sample bar is also tested for the lead content in each part of the bar bar according to the sampling and detection method of Example 1. For the process parameters and test results, see Table 1.

[0033] Table 1 Embodiment 1~9 technological parameters and the test results of each part of the spline

[0034]

[0035] From the data recorded in the above table, it can be seen that the lead content in the front and middle sections of the spline has decreased significantly, while the lead content in the tail section has increased significantly, that is to say, after multiple regional smelting treatments, the impurity lead in the spline Gradually migrate to the tail end, after removing the tail section, the ABS plastic with reduced lead content can be obtained, so the method of the present invention can i...

Embodiment 10

[0037] Embodiment 10: quality inspection

[0038] 1, adopt differential scanning calorimeter (DSC) to carry out thermal analysis to the ABS plastic sample bar and untreated ABS sample bar that above embodiment gained lead content reduces, figure 1 It is the DSC curve figure of ABS before and after zone smelting, and wherein curve 1 corresponds to waste and old ABS (untreated); Curve 2 corresponds to implementation 2 gained ABS; Curve 3 corresponds to Example 5 gained ABS; Curve 4 corresponds to Example 7 gained ABS; Curve 5 corresponds to the ABS obtained in Example 9. It can be seen from the figure that no matter which group of samples after zone smelting, the decomposition temperature measured by DSC basically does not change, so it can be seen that zone smelting has no effect on the decomposition temperature of ABS material.

[0039] 2. Adopt Fourier transform infrared spectrometer to carry out infrared analysis to the ABS obtained in the above-mentioned embodiment and the...

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Abstract

The invention belongs to the technical field of industrial plastics, and particularly relates to a method for reducing the content of heavy metals in ABS (acrylonitrile butadiene styrene) plastics, the method adopts a zone melting method to treat the ABS plastics containing the heavy metals to obtain the ABS plastics with reduced content of the heavy metals. According to the technical scheme, thezone melting method for purifying metal is introduced into a plastic heavy metal removal process, purification treatment of the ABS plastic is achieved, other reagents or chemicals do not participate,environmental protection is achieved, and the recycling rate of the waste ABS plastic can be greatly increased.

Description

technical field [0001] The invention belongs to the technical field of industrial plastics, and in particular relates to a method for reducing the heavy metal content of ABS plastics. Background technique [0002] ABS plastic has excellent mechanical properties, good heat resistance and chemical resistance, and has become the most widely used engineering plastic. [0003] With the increasing requirements for environmental protection, new requirements have been put forward for the recycling rate of waste plastics. However, a large amount of waste plastics are polluted during use and carry heavy metal elements after recycling, which hinders the reuse of plastics. [0004] For example, the ABS plastic used in the packaging of lead-acid batteries carries a trace amount of heavy metal lead during recycling, resulting in a large amount of ABS plastic recycled from waste batteries that cannot be reused. In the prior art, it is generally cleaned with water or other detergents, but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/06C08L55/02
CPCC08J11/06C08J2355/02Y02W30/62
Inventor 刘瑾李真叶青霞夏莉王卓吴东兴张定仑樊炳宇
Owner ANHUI UNIVERSITY OF ARCHITECTURE