CN110734577A - method for reducing heavy metal content in ABS plastics - Google Patents
method for reducing heavy metal content in ABS plastics Download PDFInfo
- Publication number
- CN110734577A CN110734577A CN201911065674.9A CN201911065674A CN110734577A CN 110734577 A CN110734577 A CN 110734577A CN 201911065674 A CN201911065674 A CN 201911065674A CN 110734577 A CN110734577 A CN 110734577A
- Authority
- CN
- China
- Prior art keywords
- heavy metal
- metal content
- sample strip
- abs plastic
- abs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2355/00—Characterised by the use of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08J2323/00 - C08J2353/00
- C08J2355/02—Acrylonitrile-Butadiene-Styrene [ABS] polymers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention belongs to the technical field of industrial plastics, and particularly relates to methods for reducing the heavy metal content of ABS plastics.
Description
Technical Field
The invention belongs to the technical field of industrial plastics, and particularly relates to methods for reducing the heavy metal content of ABS plastics.
Background
ABS plastic has excellent mechanical performance, better heat resistance and chemical resistance, and is the engineering plastic with the most application of .
With the increasing environmental protection requirement, new requirements are provided for the recycling rate of the waste plastics. However, a large amount of waste plastics are polluted in the using process, and heavy metal elements are carried after the waste plastics are recovered, so that the recycling of the plastics is hindered.
For example, ABS plastic used for packaging lead-acid storage batteries carries trace heavy metal lead during recovery, so that a large amount of ABS plastic recovered from waste batteries cannot be reused, in the prior art is generally cleaned by water or other detergents, but the method can only remove lead stained on the surface of the ABS plastic and cannot remove lead which has permeated into the plastic.
The scheme shows that when the TDI is purified by using the zone melting method, the melting zone moving speed is smaller, the purity of the sample starting end is higher, the temperature difference between a cooler and a heater is larger, the sample starting end is higher, the melting zone is larger, the number of times of zone melting is less, the vertical zone melting is better than the vertical downward zone melting effect, the number of times of zone melting is larger, the impurity removal amount is larger, and the number of times of zone melting is increased after reaching the limit.
The scheme shows that the zone melting technology is still only applied to the field of impurity removal of small-molecular-weight substrate materials, and the molecular weight of impurities is equivalent to that of the substrate. However, the molecular weight of ABS plastic is as high as tens of thousands or even hundreds of thousands, which is much larger than TDI, and the heavy metal impurity lead in the ABS plastic has a molecular weight of only 207.3, and the heavy metal impurity in the ABS plastic with large molecular weight is removed by a zone melting method, so the TDI purification method is obviously not feasible by transferring. Therefore, the inventors set out a problem of how to apply the zone melting technique to engineering plastics.
Disclosure of Invention
The invention aims to provide methods for reducing the heavy metal content of ABS plastics, which can effectively reduce the heavy metal content of the ABS plastics, and have the advantages of simple equipment and simple and convenient operation.
In order to achieve the purpose, the invention adopts the technical scheme that methods for reducing the heavy metal content of the ABS plastic adopt a zone melting method to treat the ABS plastic containing heavy metal, so as to obtain the ABS plastic with reduced heavy metal content.
According to the technical scheme, the zone melting method for purifying the metal is introduced into the plastic heavy metal removal process, so that the purification treatment of the ABS plastic is realized, other reagents or chemicals are not involved, the method is green and environment-friendly, and the recycling rate of the waste ABS plastic can be greatly improved.
Specifically, the method for reducing the heavy metal content of the ABS plastic comprises the following steps:
a) processing the ABS plastic containing heavy metal into long strip-shaped sample strips;
b) heating tips of the sample strip to be molten by a heating device;
c) slowly moving the sample strip and/or the heating device to enable the heated area on the sample strip to be slowly moved to the tail end, controlling the relative moving speed of the sample strip and the heating device to ensure that the sample strip at the position of the heating device can be heated to be molten, and naturally cooling and solidifying the sample strip in the molten state after the sample strip is far away from the heating device;
d) repeating the steps b) and c) for 20-60 times, wherein the initial end of each heating in the step b) is the same as that of the previous times;
e) removing the tail end of the sample strip to obtain the ABS plastic with the reduced heavy metal content.
Specifically, the steps a), b) and c) are all carried out under a nitrogen atmosphere. If ABS plastic is melted in air and exposed to oxygen, molecules of the ABS plastic are oxidized and decomposed.
In the step a), the heavy metal contained in the ABS plastic is lead. The primary purpose of the invention is to reduce the lead content in the recycled waste battery packaging material by using a zone melting method, and after the technology is mature, the technology can be used for removing other impurities by using other engineering plastics.
In the step b), the heating unit of the heating device is an annular heating sleeve. The ABS plastic sample strip can be heated more uniformly.
The heating temperature of the heating device is 220-300 ℃. The ABS can be ensured to be heated to a molten state without decomposition.
The length of the instantaneous heating area on the sample strip is 3-7 cm. The heating area is too short, namely the melting zone is too short, so that the migration of impurity lead in the molten ABS macromolecule gap is not facilitated, and the heating area is too long, namely the melting zone is too long, so that the migration direction of the impurity lead in the melt away from the condensation interface part is difficult to control.
And in the step e), the tail end is removed, wherein the length of heating areas is removed from the tail end of the sample strip, the removed tail end has high heavy metal content, the sample can be prepared by a system after collection, and the waste ABS plastic is purified by adopting the method disclosed by the invention, so that the reutilization rate of the waste ABS plastic is improved.
The relative moving speed of the heating device and the sample strip is as follows: the relative movement speed of the sample strip and the heating device is 1-2 mm/s. Because the ABS plastic has a slow heat transfer rate, the ABS plastic is not easy to melt due to an excessively high moving speed; and the moving speed is too slow, the lead ions have insufficient migration tendency to the tail end along with the melting area of the ABS, and can be homogenized again in the melting area and difficultly concentrated to the tail end.
The beneficial effect that adopts above-mentioned technical scheme to produce lies in: the technical scheme of the invention is simple and environment-friendly, has short time and easily controlled process conditions; more importantly, the zone melting purification technology is applied to the field of heavy metal removal of high polymers, and a new research direction is provided for the field of impurity removal of engineering plastics.
Drawings
FIG. 1 is a DSC plot of ABS before and after zone melting;
FIG. 2 is an infrared spectrum of ABS before and after zone melting.
Detailed Description
The technical solution of the present invention is further described in with reference to the following examples.
The instrument comprises the following steps: the automatic slide rail (adjustable speed) of the water bottle, a heating device (with a heating ring and the width of 3cm, 5cm and 7cm), a glass tube (with the length of 120cm and the diameter of 1.2cm), a nitrogen bottle and a clamp.
Splines: taking ABS plastic recovered from waste batteries, cleaning, drying, crushing, uniformly mixing, measuring the initial lead content by ICP (inductively coupled plasma) to be 540ppm, and extruding by an extruder to prepare a plurality of sample strips with the length of about 1m and the diameter of 0.5cm respectively for later use.
Example 1
Placing an ABS plastic sample strip with the diameter of 0.5cm in a glass tube, transversely clamping and fixing the glass tube by using a clamp, continuously introducing nitrogen into the glass tube, arranging a heating device on a horizontal automatic sliding rail, sleeving a heating ring with the transverse width of 5cm at the end of the sample strip, setting the heating temperature to be 260 ℃, setting the moving speed of the sliding rail to be 1mm/s, circularly melting for 20 times, respectively sampling the front section, the middle section and the tail section of the obtained sample strip after the completion, detecting the lead content in the sample strip by using ICP (inductively coupled plasma), and recording the result in a table 1.
Examples 2 to 9
The sample strip is subjected to circular zone melting treatment by the same method as in the embodiment 1, the process parameters are changed, the obtained sample strip is also subjected to detection on the lead content of each part of the sample strip by the sampling and detecting method in the embodiment 1, and the process parameters and the detection results are shown in the table 1.
TABLE 1 EXAMPLES 1 TO 9 TECHNOLOGY PARAMETERS AND TEST RESULTS OF PARTS OF SAMPLES
The data recorded in the table show that the lead content of the front section and the middle section of the sample strip is obviously reduced, the lead content of the tail section is obviously improved, namely after multiple zone melting treatments, the impurity lead in the sample strip gradually migrates to the tail end, and the ABS plastic with the reduced lead content can be obtained after the tail section is removed, so the method can effectively reduce the heavy metal lead content in the ABS plastic.
Under the same other conditions, the more times of zone melting, the better the lead removal effect, but when the lead removal effect reaches the limit distribution, the removal of lead is not influenced by increasing the number of zone melting, and in the experiment, when the number of zone melting is 40, the best effect is basically achieved. The melting zone is too short, so that the migration of impurity lead in a molten ABS macromolecular gap is not facilitated, the heating zone is too long, namely the melting zone is too long, the migration direction of the impurity lead in a melt away from a condensation interface part is difficult to control, and therefore the length of the melting zone in an experiment is optimal when the length of the melting zone is 5 cm. When the temperature is low, ABS is not obviously melted, molecular chains are in a winding state, the migration of lead ions is not facilitated, when the temperature is high, the zone melting effect is good, but the temperature is too high, the energy consumption is large, and therefore, when the experimental temperature is 260 ℃, the purification can be completed, and the energy consumption is relatively low. When the moving speed of the melting zone is low, the time is long, and the device condition is required to be stable, which puts higher requirements on the stability of the driving device; and when the moving speed is high, the complete diffusion of impurities in the melt is not facilitated.
Example 10: quality inspection
1. Thermal analysis was performed on the ABS plastic sample strips with reduced lead content and the untreated ABS sample strips obtained in the above examples using a Differential Scanning Calorimeter (DSC), fig. 1 is a DSC graph of ABS before and after zone melting, where curve 1 corresponds to the used ABS (before treatment); curve 2 corresponds to the ABS obtained in example 2; curve 3 corresponds to the ABS obtained in example 5; curve 4 corresponds to the ABS obtained in example 7; curve 5 corresponds to the ABS obtained in example 9. As can be seen from the figure, the decomposition temperature measured by DSC is not substantially changed no matter which group of samples after zone melting, so that zone melting has no influence on the decomposition temperature of the ABS material.
2. Performing infrared analysis on the ABS obtained in the embodiment and the ABS sample strips before treatment by using a Fourier infrared spectrometer, wherein FIG. 2 is an infrared spectrogram of the ABS before and after zone melting, and curve 1 corresponds to waste ABS (before treatment);curve 2 corresponds to the ABS obtained in example 2; curve 3 corresponds to the ABS obtained in example 5; curve 4 corresponds to the ABS obtained in example 7; curve 5 corresponds to the ABS obtained in example 9. On curve 1, 3022cm-1Is a C-H stretching vibration peak on a benzene ring, and is 2920cm-1Is the C-H stretching vibration peak on the vinyl group, 1446cm-1Is the vibration peak of benzene ring skeleton, 2244cm-1Is cyano C ≡ N stretching vibration peak. On the other hand, these vibration absorption peaks were found in the vicinity of the same positions on the curves 2, 3, 4, and 5, indicating that the ABS resin groups after zone melting were not changed.
The research shows that the structure of the ABS plastic with reduced heavy metal content obtained after zone melting treatment is stable.
Claims (9)
1, A method for reducing the heavy metal content of ABS plastics, which is characterized in that the ABS plastics containing heavy metal are treated by adopting a zone melting method to obtain the ABS plastics with reduced heavy metal content.
2. The method for reducing the heavy metal content of the ABS plastic according to claim 1, comprising the following steps:
a) processing the ABS plastic containing heavy metal into long strip-shaped sample strips;
b) heating tips of the sample strip to be molten by a heating device;
c) slowly moving the sample strip and/or the heating device to enable the heated area on the sample strip to be slowly moved to the tail end, controlling the relative moving speed of the sample strip and the heating device to ensure that the sample strip at the position of the heating device can be heated to be molten, and naturally cooling and solidifying the sample strip in the molten state after the sample strip is far away from the heating device;
d) repeating the steps b) and c) for 20-60 times, wherein the initial end of each heating in the step b) is the same as that of the previous times;
e) removing the tail end of the sample strip to obtain the ABS plastic with the reduced heavy metal content.
3. The method for reducing the heavy metal content of the ABS plastic according to claim 2, wherein the method comprises the following steps: the steps a), b) and c) are all carried out under a nitrogen atmosphere.
4. The method for reducing the heavy metal content of the ABS plastic according to claim 2, wherein the method comprises the following steps: in the step a), the heavy metal contained in the ABS plastic is lead.
5. The method for reducing the heavy metal content of the ABS plastic according to claim 2, wherein the method comprises the following steps: in the step b), the heating unit of the heating device is an annular heating sleeve.
6. The method for reducing the heavy metal content of the ABS plastic according to claim 2, wherein the method comprises the following steps: the heating temperature of the heating device is 220-300 ℃.
7. The method for reducing the heavy metal content of the ABS plastic according to claim 2, wherein the method comprises the following steps: the length of the instantaneous heating area on the sample strip is 3-7 cm.
8. The method for reducing the heavy metal content in the ABS plastic according to claim 2, wherein the tail end is removed in step e), wherein heating zone lengths are removed from the tail end of the sample strip.
9. The method for reducing the heavy metal content of the ABS plastic according to claim 2, wherein the method comprises the following steps: the relative moving speed of the heating device and the sample strip is as follows: the relative movement speed of the sample strip and the heating device is 1-2 mm/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911065674.9A CN110734577A (en) | 2019-11-04 | 2019-11-04 | method for reducing heavy metal content in ABS plastics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911065674.9A CN110734577A (en) | 2019-11-04 | 2019-11-04 | method for reducing heavy metal content in ABS plastics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110734577A true CN110734577A (en) | 2020-01-31 |
Family
ID=69272174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911065674.9A Pending CN110734577A (en) | 2019-11-04 | 2019-11-04 | method for reducing heavy metal content in ABS plastics |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110734577A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112280236A (en) * | 2020-11-09 | 2021-01-29 | 汨罗市锦胜科技有限公司 | Method for regenerating deleading ABS plastic from waste lead-acid storage battery |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8106104B1 (en) * | 2007-07-19 | 2012-01-31 | Advanced Environmental Recycling Technologies, Inc. | Method for processing and analyzing contaminated mixed waste plastics to produce reformulated, blended feed materials having a desired plastic content |
| CN102425933A (en) * | 2011-08-25 | 2012-04-25 | 南京邮电大学 | Zone melting device for highly purifying polymer semiconductor and method |
| CN104974062A (en) * | 2015-06-30 | 2015-10-14 | 成都理工大学 | TDI purification process of zone melting method |
| CN108250427A (en) * | 2017-12-21 | 2018-07-06 | 南京邮电大学 | A kind of area's melting method of purified polymer polyethylene glycol |
-
2019
- 2019-11-04 CN CN201911065674.9A patent/CN110734577A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8106104B1 (en) * | 2007-07-19 | 2012-01-31 | Advanced Environmental Recycling Technologies, Inc. | Method for processing and analyzing contaminated mixed waste plastics to produce reformulated, blended feed materials having a desired plastic content |
| CN102425933A (en) * | 2011-08-25 | 2012-04-25 | 南京邮电大学 | Zone melting device for highly purifying polymer semiconductor and method |
| CN104974062A (en) * | 2015-06-30 | 2015-10-14 | 成都理工大学 | TDI purification process of zone melting method |
| CN108250427A (en) * | 2017-12-21 | 2018-07-06 | 南京邮电大学 | A kind of area's melting method of purified polymer polyethylene glycol |
Non-Patent Citations (2)
| Title |
|---|
| 刘文胜等: "区域熔炼技术的研究现状", 《稀有金属与硬质合金》 * |
| 潘红娜: "《晶体硅太阳能电池制备技术》", 31 October 2017 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112280236A (en) * | 2020-11-09 | 2021-01-29 | 汨罗市锦胜科技有限公司 | Method for regenerating deleading ABS plastic from waste lead-acid storage battery |
| CN112280236B (en) * | 2020-11-09 | 2024-05-14 | 湖南省汨罗锦胜智造科技股份有限公司 | Method for regenerating lead-removed ABS plastic from waste lead-acid storage battery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108560243B (en) | Carbon fiber surface treatment method and application | |
| CN110734577A (en) | method for reducing heavy metal content in ABS plastics | |
| CN104356487B (en) | The preparation method of a kind of cable Graphene semi-conductive screen material | |
| ATE72539T1 (en) | METHOD AND DEVICE FOR PRODUCTION OF SHAPE-HOLDING SEMI-FINISHED PRODUCT FROM THERMOPLASTIC BINDING AGENT AND SEMI-FINISHED PRODUCT. | |
| DE69935535D1 (en) | PROCESS FOR IMPROVING STATE OF RECYCLING OF SPECIFIC PLASTIC MATERIAL | |
| CN211318325U (en) | Pretreatment system for measuring ultraviolet absorbent in household product | |
| CN104441536B (en) | Polyether-ether-ketone capillary extrusion production technology and equipment | |
| Wells et al. | [41] RPC-5 Column chromatography for the isolation of DNA fragments | |
| CN109574016B (en) | Directional solidification purification device and purification method for metallurgical silicon | |
| CN112322077B (en) | Production method of carbon black for environment-friendly cable shielding material | |
| CN114182384B (en) | Method for converting waste mask into regenerated polypropylene fiber | |
| US20030146547A1 (en) | Method for recovering mixed plastic matter | |
| CN108069422A (en) | A kind of method of graphite purification | |
| CN108265122B (en) | PCR method for rapidly identifying authenticity of fritillaria cirrhosa | |
| CN102009962A (en) | Process for continuously producing insoluble sulfur by pipeline | |
| CN106750505B (en) | The method and device of thermal activation oxide semiconductor recycling carbon fiber | |
| Issasi et al. | Removal of impurities from low-density polyethylene using supercritical carbon dioxide extraction | |
| CN111933867B (en) | Film without grease residue and preparation method thereof | |
| Bortoluzzi et al. | Solid phase microextraction to concentrate volatile products from thermal degradation of polymers | |
| CN110834400B (en) | Preparation method of scratch-resistant polypropylene injection molding part | |
| CN116203105B (en) | Low-cost nucleic acid/protein electroelution device and method | |
| CN109023647B (en) | Preparation method of wear-resistant monofilament filter cloth for filtering high-temperature liquid | |
| DE602005016923D1 (en) | METHOD AND DEVICE FOR PRODUCING A PLASTIC PREFORMS | |
| CN106365146A (en) | Impurity removal method of carbon nanotubes | |
| JPH1073586A (en) | Method and apparatus for analyzing minute amount of oxygen in metal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |