CN114764099A - Evaluation system for evaluating quality of regenerated plastic at multiple angles - Google Patents
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- 238000011156 evaluation Methods 0.000 title claims abstract description 145
- 239000004033 plastic Substances 0.000 title claims abstract description 121
- 229920003023 plastic Polymers 0.000 title claims abstract description 121
- 239000000126 substance Substances 0.000 claims abstract description 29
- 238000013441 quality evaluation Methods 0.000 claims abstract description 21
- 239000011347 resin Substances 0.000 claims description 30
- 229920005989 resin Polymers 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 6
- 241000270295 Serpentes Species 0.000 claims description 4
- 238000013211 curve analysis Methods 0.000 claims description 4
- 238000000113 differential scanning calorimetry Methods 0.000 claims description 4
- 238000004566 IR spectroscopy Methods 0.000 claims description 3
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract description 4
- 230000000750 progressive effect Effects 0.000 abstract description 2
- 239000004743 Polypropylene Substances 0.000 description 22
- -1 polypropylene Polymers 0.000 description 20
- 229920001155 polypropylene Polymers 0.000 description 20
- 238000012360 testing method Methods 0.000 description 11
- 239000008187 granular material Substances 0.000 description 5
- 229910001385 heavy metal Inorganic materials 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 239000000155 melt Substances 0.000 description 3
- 101100117236 Drosophila melanogaster speck gene Proteins 0.000 description 2
- 229920000426 Microplastic Polymers 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
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- 238000002329 infrared spectrum Methods 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- G01N25/00—Investigating or analyzing materials by the use of thermal means
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention provides an evaluation system for evaluating the quality of recycled plastics in multiple angles, which comprises the steps of identifying the recycled plastics and evaluating the quality of the recycled plastics, wherein the evaluation of the quality of the recycled plastics comprises appearance evaluation, mechanical property evaluation and chemical property evaluation. According to the evaluation system for evaluating the quality of the regenerated plastic in multiple angles, provided by the invention, the appearance evaluation, the mechanical performance evaluation and the chemical performance evaluation are evaluated and analyzed in a progressive mode, and a report of each part of quality evaluation is provided, so that the quality of the regenerated plastic is evaluated in a more targeted manner, the market positioning is determined for the sale, utilization and the like of the regenerated plastic, the development of the regenerated plastic industry is promoted, and the recycling of regenerated plastic resources is realized.
Description
Technical Field
The invention relates to a multi-angle evaluation system, in particular to an evaluation system for evaluating the quality of regenerated plastics in multiple angles.
Background
The recycled plastic is the plastic which is obtained by recycling the waste plastic and processing the waste plastic, because the source of the plastic base material of the recycled plastic is complex, some recycled plastics are processed by a single type of resin again, the grade of the recycled plastic is higher, some recycled plastics are processed by a mixture of various types of resin again, the recycled plastic is impure in material property and lower in relative grade, and the type of the main resin in the recycled plastic can influence or even determine the use of the recycled plastic; meanwhile, the recycled plastic has certain influence on the quality of the recycled plastic due to various factors such as sources, cleanness, processing and the like, and the combination of various factors can lead the quality of the recycled plastic to be uneven, thereby delaying the economic development of the recycled plastic industry.
The applicant discloses a "multidimensional quality evaluation method for recycled plastics" in chinese patent CN111289732A, which performs multidimensional quality evaluation on recycled plastics, but the patent only simply detects the quality to be evaluated and reports a numerical value, and does not form a complete evaluation system. In order to promote the development of the recycled plastic industry, a multi-angle evaluation system of the recycled plastic is urgently needed to be provided, and the quality of the recycled plastic is scientifically and economically identified.
Disclosure of Invention
In order to solve the technical problems, the invention provides an evaluation system for evaluating the quality of the recycled plastic in multiple angles in a first aspect, which comprises the steps of identifying the recycled plastic and evaluating the quality of the recycled plastic.
Preferably, the method for identifying the recycled plastic is selected from at least one of infrared spectroscopy, thermal cracking-gas chromatography mass spectrometry, differential scanning calorimetry and thermogravimetric curve analysis.
Preferably, the quality evaluation of the recycled plastic is performed by setting a specific evaluation index according to the type of the recycled plastic to be identified.
Preferably, the recycled plastic quality evaluation is at least one selected from appearance evaluation, mechanical property evaluation and chemical property evaluation.
Preferably, the appearance evaluation is at least one selected from gloss evaluation, transparency evaluation, L, a, b value evaluation, impurity point evaluation, tailing grain, snakeskin grain, and effective grain.
Preferably, the mechanical property evaluation is at least one selected from the group consisting of mechanical properties, melt mass flow rate, load deflection temperature.
Preferably, the chemical property evaluation is selected from at least one of a limited substance content evaluation, a high substance of interest content evaluation, an ash evaluation, and an odor evaluation.
Preferably, the quality evaluation of the recycled plastic comprises the following steps:
(1) identifying the types of the recycled plastics;
(2) carrying out appearance evaluation on the recycled plastic and issuing an appearance evaluation report;
(3) evaluating the mechanical property of the recycled plastic subjected to appearance evaluation, and issuing a mechanical property evaluation report;
(4) carrying out chemical performance evaluation on the recycled plastic subjected to mechanical performance evaluation, and issuing a chemical performance evaluation report;
(5) and after all evaluations are completed, issuing an overall evaluation report.
Preferably, the steps (2), (3) and (4) all give corresponding evaluation reports.
The second aspect of the invention provides application of an evaluation system for evaluating the quality of the recycled plastics in multiple angles, which is applied to evaluating PP, PE, PS, ABS, PVC single resin and various mixed resins of the recycled plastics.
Compared with the prior art, the invention has the following beneficial effects:
1. the evaluation system provided by the invention firstly identifies the types of the recycled plastics to be evaluated, and selects the quality evaluation index of the recycled plastics and sets the index value according to different recycled plastic types.
2. The evaluation system provided by the invention relates the quality evaluation of the recycled plastic with the types of the recycled plastic, so that the quality evaluation of the recycled plastic is more pertinent, and the quality evaluation of the recycled plastic provided by the invention adopts a progressive mode to evaluate and analyze the appearance evaluation, the mechanical performance evaluation and the chemical performance evaluation, and provides a report of each part of quality evaluation, so that the quality and the application of the recycled plastic are defined more comprehensively and accurately.
3. The evaluation system provided by the invention comprehensively evaluates the recycled plastic from multiple angles, determines market positioning for sale, utilization and the like of the recycled plastic, provides an evaluation idea of the quality of the recycled plastic for the recycled plastic industry, is beneficial to promoting the development of the recycled plastic industry and realizes the recycling of recycled plastic resources.
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FIG. 1 is a multi-angle evaluation system for evaluating the quality of a recycled plastic according to a preferred embodiment of the present invention.
Wherein, 1: identifying the recycled plastic products; 2: evaluating the quality of the recycled plastic; 201: appearance evaluation in the evaluation of recycled plastic quality; 202: mechanical performance evaluation in the quality evaluation of the recycled plastic; 203: chemical property evaluation in the evaluation of the quality of recycled plastics.
Detailed Description
The following describes in detail a specific embodiment of the present invention with reference to fig. 1.
In order to solve the above technical problems, the first aspect of the present invention provides an evaluation system for evaluating the quality of recycled plastics in multiple angles, including the identification of recycled plastics and the quality evaluation of recycled plastics.
The system for evaluating the quality of the recycled plastic from multiple angles as shown in FIG. 1 comprises the following steps:
step 1: carrying out chemical analysis test on the recycled plastic to identify the recycled plastic products;
step 2: according to the types of the recycled plastics, the quality of the recycled plastics is pertinently identified;
step 201: evaluating the appearance quality of the recycled plastic and issuing an appearance evaluation report;
step 202: evaluating the mechanical performance of the recycled plastic subjected to the appearance quality evaluation and provided with an appearance evaluation report, and providing a mechanical performance evaluation report;
step 203: and (3) carrying out chemical performance evaluation on the recycled plastic which is subjected to appearance quality evaluation and mechanical performance evaluation and has two evaluation reports of appearance quality and mechanical performance, and issuing a chemical performance evaluation report.
Preferably, the identification method of the recycled plastic products in the step 1 is at least one selected from infrared spectroscopy, thermal cracking-gas chromatography mass spectrometry, differential scanning calorimetry and thermogravimetric curve analysis.
Preferably, in the step 2, the quality evaluation of the recycled plastic is performed by setting a specific evaluation index according to the type of the recycled plastic to be identified.
Preferably, the quality evaluation of the recycled plastic in the step 2 is at least one selected from the group consisting of appearance evaluation in the step 201, mechanical performance evaluation in the step 202, and chemical performance evaluation in the step 203.
Preferably, the step 201 appearance evaluation is at least one selected from gloss evaluation, transparency evaluation, L, a, b value evaluation, impurity point evaluation, tailing grain, snakeskin grain, and effective grain.
Preferably, the appearance evaluation comprises tailing grains, snakeskin grains, effective grains, black grains and black speck grains and glossiness evaluation.
Preferably, the evaluation reference standard SH/T1541.1-2006 of tailing grains, snake skin grains, effective grains, black grains and black speck grains is provided.
Wherein the effective granules represent the weight ratio of the recycled plastic granules of continuous granules, long and thin granules and broken granules in which two or more granules are not adhered to each other in 1kg of the recycled plastic granules to the total weight.
Gloss test method: fixing the recycled plastic on a black glass plate, selecting different angles to respectively inject light rays, and measuring the glossiness of the recycled plastic.
Preferably, the light incidence angle is one of 20 °, 45 °, and 60 °.
The appearance evaluation method provided by the invention evaluates the recycled plastic through various aspects such as color, particle size, appearance and the like, and the obtained evaluation result can roughly evaluate the grade of the recycled plastic when mechanical performance evaluation and chemical performance evaluation are not carried out.
Preferably, the step 202 mechanical property evaluation is at least one selected from mechanical properties, melt mass flow rate, load deformation temperature.
Preferably, the mechanical properties include density, tensile yield stress, flexural strength, flexural modulus, impact strength.
Preferably, the melt mass flow rate is determined in accordance with GB/T368201-2018.
Preferably, the load deformation temperature is measured in accordance with GB/T1643.2.
The mechanical performance evaluation method provided by the invention can evaluate the recycled plastic subjected to appearance evaluation in multiple aspects such as mechanical performance, melt fluidity, load deformation temperature and the like, and the obtained evaluation result can further evaluate the grade of the recycled plastic, and can roughly know the application field and market positioning of the evaluated recycled plastic through the report of model performance evaluation.
Preferably, the step 203 of evaluating the chemical performance is at least one selected from the group consisting of limited substance content evaluation, ash evaluation and odor evaluation.
Preferably, the limited substance content evaluation comprises heavy metal content evaluation and volatile matter content evaluation.
Preferably, the heavy metal has a density of more than 7g/cm3The metal of (2).
Preferably, the heavy metal content is in accordance with IEC 62321: 2016. IEC 62321: 2017 for measurement.
Preferably, the ash is a substance remaining after the recycled plastic is completely burned at 700 ℃ or more.
Preferably, the odor is subjected to an odor rating test in accordance with GB/T24149.2-2017.
According to the chemical performance evaluation method provided by the invention, the recycled plastic subjected to mechanical performance evaluation is evaluated by multiple aspects such as limited substance content evaluation, ash content evaluation, odor evaluation and the like, and the obtained evaluation result can further define the application field and market location of the recycled plastic, promote the development of the recycled plastic industry and realize the recycling of recycled plastic resources.
Preferably, the quality evaluation of the recycled plastic comprises the following steps:
(1) identifying the types of the recycled plastics;
(2) carrying out appearance evaluation on the recycled plastic and issuing an appearance evaluation report;
(3) evaluating the mechanical property of the recycled plastic subjected to appearance evaluation, and issuing a mechanical property evaluation report;
(4) carrying out chemical performance evaluation on the recycled plastic subjected to mechanical performance evaluation, and issuing a chemical performance evaluation report;
(5) and after all evaluations are finished, issuing an overall evaluation report.
Preferably, the steps (2), (3) and (4) all give corresponding evaluation reports.
The second aspect of the invention provides application of an evaluation system for multi-angle evaluation of the quality of the recycled plastics, which is applied to evaluation of single resins and various mixed resins of PP, PE, PS, ABS and PVC of the recycled plastics.
Example 1
An evaluation system for evaluating the quality of recycled plastics at multiple angles is shown in figure 1, and comprises the following steps:
(1) performing infrared spectrum analysis, differential scanning calorimetry analysis and thermogravimetric curve analysis on the recycled plastic according to the step 1, comprehensively identifying the type of the recycled plastic, and identifying that the recycled plastic is polypropylene resin;
(2) the polypropylene resin was subjected to appearance evaluation in accordance with step 201 of step 2;
(3) according to SH/T1541.1-2006 standard, the number of tailing grains and snake skin grains is measured, the test result is that the number of tailing grains is 10/kg, the number of snake skin grains is 8/kg, and the content of effective particles is 95%;
(3) fixing the polypropylene resin on a black glass plate, injecting light at an angle of 60 degrees, measuring the glossiness of the polypropylene resin, and displaying that the glossiness is 65 according to a test result;
(4) and (3) collating the test data, and giving an appearance evaluation report, wherein the final result of the report shows that the regenerated polypropylene resin is a regenerated primary material or a regenerated secondary material.
Example 2
An evaluation system for evaluating the quality of recycled plastics from multiple angles further comprises the following steps 202 in step 2:
(1) weighing part of the regenerated polypropylene resin at 25 +/-2 ℃, adding distilled water with known weight to completely immerse the regenerated polypropylene resin, weighing the distilled water with the regenerated polypropylene resin, and calculating the density of the regenerated polypropylene resin according to a density calculation formula, wherein the result shows that the density is 0.96g/cm3；
(2) Clamping two ends of the regenerated polypropylene resin by using a testing machine, moving the regenerated polypropylene resin to the two ends at the speed of 2mm/min, recording the load when the regenerated polypropylene resin deforms, and calculating the tensile yield stress, wherein the tensile yield stress is 25 MPa; the flexural strength and flexural modulus were measured in a similar manner, and the results showed that the flexural strength was 28MPa and the flexural modulus 1051 MPa.
(3) The regenerated polypropylene resin was fixed by a testing machine, a pendulum of known mass was released, the impact energy of the pendulum absorbed by the specimen was recorded, and the impact strength was calculated, and the result showed that the impact strength was 2.6kJ/m2；
(4) The melt mass flow rate of the regenerated polypropylene resin is measured according to the method GB/T368201-2018, and the result shows that the melt mass flow rate is 27.2g/10 min; the load deformation temperature of the recycled polypropylene resin is measured under the load of 0.45MPa according to the method GB/T1643.2, and the result shows that the load deformation temperature is 80 ℃;
(5) and (3) sorting the test data, issuing a mechanical property evaluation report, and displaying the final result of the report, wherein the regenerated polypropylene resin can be classified into toughening general resin.
Example 3
An evaluation system for evaluating the quality of recycled plastics from multiple angles further comprises the following steps 203 in step 2:
(1) performing an odor grade test according to GB/T24149.2-2017, wherein the result shows that the odor grade is grade 2;
(2) heating a regenerated polypropylene resin with a known weight in an oven at 105 ℃ for 6 hours, weighing the heated regenerated polypropylene resin, and calculating the volatile content, wherein the volatile content is 0.02 percent;
(3) reference test method IEC 62321: 2016. IEC 62321: 2017, testing the content of the heavy metal, wherein the result shows that the heavy metal is not detected;
(4) completely burning a certain amount of regenerated polypropylene resin at 700 ℃, weighing the weight of the residual ash, and calculating the ash content, wherein the result shows that the ash content is 4.8%;
(5) and (3) finishing the test data to give a chemical performance evaluation report, wherein the final result of the report shows that the regenerated polypropylene resin can be used for drawing, injection molding, extrusion and the like.
While the invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention.
Claims (10)
1. The system for evaluating the quality of the recycled plastic in multiple angles is characterized by comprising recycled plastic identification and recycled plastic quality evaluation.
2. The evaluation system of claim 1, wherein the recycled plastic product is identified by at least one method selected from infrared spectroscopy, thermal cracking-gas chromatography mass spectrometry, differential scanning calorimetry, and thermogravimetric curve analysis.
3. The evaluation system according to claim 1, wherein the quality evaluation of the recycled plastic is performed by setting a specific evaluation index according to the type of the recycled plastic to be identified.
4. The evaluation system according to claim 3, wherein the recycled plastic quality evaluation is at least one selected from the group consisting of appearance evaluation, mechanical property evaluation, and chemical property evaluation.
5. The evaluation system according to claim 4, wherein the appearance evaluation is at least one selected from gloss evaluation, transparency evaluation, L, a, b value evaluation, impurity point evaluation, tailing grain, snake skin grain, and effective grain.
6. The evaluation system of claim 4, wherein the mechanical property evaluation is selected from at least one of mechanical properties, melt mass flow rate, load deflection temperature.
7. The evaluation system of claim 4, wherein the chemical property evaluation is selected from at least one of a limiting substance content evaluation, a high substance of interest content evaluation, an ash evaluation, and an odor evaluation.
8. The evaluation system according to any one of claims 4 to 7, wherein the step of evaluating the quality of the recycled plastic is as follows:
(1) identifying the types of the recycled plastics;
(2) carrying out appearance evaluation on the recycled plastic;
(3) evaluating the mechanical property of the recycled plastic subjected to appearance evaluation;
(4) evaluating the chemical performance of the recycled plastic subjected to mechanical performance evaluation;
(5) and after all evaluations are completed, issuing an overall evaluation report.
9. The evaluation system according to claim 8, wherein the steps (2), (3) and (4) all provide corresponding evaluation reports.
10. The application of the system for evaluating the quality of the recycled plastics in multiple angles according to claim 1 is characterized by being applied to evaluating the PP, PE, PS, ABS, PVC single resin and multiple mixed resins of the recycled plastics.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117147556A (en) * | 2023-08-21 | 2023-12-01 | 山东巨野盛鑫电器材料有限公司 | Quality detection system of polyimide insulating film |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109870559A (en) * | 2017-12-04 | 2019-06-11 | 金发科技股份有限公司 | A kind of discrimination method of ABS plastic reworked material |
| CN109870561A (en) * | 2017-12-04 | 2019-06-11 | 金发科技股份有限公司 | A kind of detection method of high density or low density polyethylene (LDPE) reworked material |
| CN111289732A (en) * | 2020-03-25 | 2020-06-16 | 上海睿聚环保科技有限公司 | Multi-dimensional quality evaluation method for recycled plastic |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109870559A (en) * | 2017-12-04 | 2019-06-11 | 金发科技股份有限公司 | A kind of discrimination method of ABS plastic reworked material |
| CN109870561A (en) * | 2017-12-04 | 2019-06-11 | 金发科技股份有限公司 | A kind of detection method of high density or low density polyethylene (LDPE) reworked material |
| CN111289732A (en) * | 2020-03-25 | 2020-06-16 | 上海睿聚环保科技有限公司 | Multi-dimensional quality evaluation method for recycled plastic |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117147556A (en) * | 2023-08-21 | 2023-12-01 | 山东巨野盛鑫电器材料有限公司 | Quality detection system of polyimide insulating film |
| CN117147556B (en) * | 2023-08-21 | 2024-05-24 | 山东巨野盛鑫电器材料有限公司 | Quality detection system of polyimide insulating film |
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