CN111289732A - Multi-dimensional quality evaluation method for recycled plastic - Google Patents

Multi-dimensional quality evaluation method for recycled plastic Download PDF

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Publication number
CN111289732A
CN111289732A CN202010216186.XA CN202010216186A CN111289732A CN 111289732 A CN111289732 A CN 111289732A CN 202010216186 A CN202010216186 A CN 202010216186A CN 111289732 A CN111289732 A CN 111289732A
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test
recycled
impurity
quality evaluation
recycled plastics
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许文殊
熊维
朱宽
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Shanghai Ruiju Environmental Protection Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/44—Resins; Plastics; Rubber; Leather
    • G01N33/442—Resins; Plastics
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/36—Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N2021/8472—Investigation of composite materials

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Abstract

The invention relates to the field of quality evaluation of recycled plastics, and provides a multi-dimensional quality evaluation method of recycled plastics, which at least comprises the following steps: physical and mechanical performance test, safety test, color test, impurity quantitative test, molding surface test, odor grade test and metal content test. The invention is used for evaluating the quality of the recycled plastic from a plurality of different aspects, is comprehensive and accurate, has very high practicability, can improve the market value of recycled products of the recycled plastic, is beneficial to recycling and reclassifying, and realizes the real resource recycling.

Description

Multi-dimensional quality evaluation method for recycled plastic
Technical Field
The invention relates to the field of quality evaluation of recycled plastics, in particular to a multi-dimensional quality evaluation method of recycled plastics.
Background
The recycled plastic is a plastic raw material obtained by processing and processing waste plastics by physical or chemical methods such as pretreatment, melt granulation, modification and the like, and is used for recycling the waste plastics.
The recycled plastic base material has complicated source, disordered quality control regulations of enterprise particles, simple and crude quality evaluation system and lack of industrial product standards, and all the factors reduce the transaction efficiency of the recycled plastic product and increase the transaction cost. The trade of the recycled plastic products is limited, and the recycling of the renewable resources of the plastic is also influenced. In order to promote the recovery and classification of waste plastics, reduce the harm of plastic wastes to the environment and standardize the production and trade of regenerated plastic products, a quality evaluation method is made in time to standardize the product quality and further promote the high-quality development of the domestic regenerated plastic industry.
Disclosure of Invention
In order to solve the above-mentioned technical problem, a first aspect of the present invention provides a method for evaluating the quality of recycled plastics in multiple dimensions, comprising at least: physical and mechanical performance test, safety test, odor grade test, metal content test, color test, molding surface test, impurity quantitative test and main body resin qualitative test.
As a preferred technical solution, the physical and mechanical property test in the present invention at least includes: one of a melt flow rate test, a density test, an ash test, a tensile strength test, an elongation at break test, a flexural strength test, a flexural modulus test, and an impact strength test.
As a preferred technical solution, the safety test in the present invention at least includes: heavy metal content, polybrominated biphenyls (PBBs) and polybrominated diphenyl ethers (PBDEs), phthalates, Polycyclic Aromatic Hydrocarbons (PAHs), SVHC (substances of high interest).
In the invention, as a preferable technical scheme, 1kg of recycled plastic particles are intensively spread out for 1 square meter, and the recycled plastic particles are rolled for 1 time by a magnet rod to calculate the quantity of the attracted iron-containing particles.
As a preferable technical scheme, the magnetic flux of the magnet bar is 10000 gauss.
As a preferred technical solution, the color test in the present invention includes at least one of l.a.b. value, glossiness and transparency.
As a preferred technical solution, the method for quantitatively testing impurities in the present invention comprises: (1) preparing a sample: taking the regenerated plastic particles to be detected, and preparing a diaphragm to be detected; (2) impurity metering: measuring and counting the diameter of impurity points in the membrane to be measured; (3) and (3) calculating the impurity score: the points of different diameters correspond to different scores. And adding the corresponding scores of all the impurity points, wherein the total score is a quantitative result.
As a preferred technical scheme, the thickness of the membrane to be measured is 50-150 μm; the diameter is 100-200 mm.
As a preferred technical scheme, the thickness of the membrane to be measured is 100 microns; the diameter is 150 mm.
As a preferable technical scheme, the main resin qualitative in the invention at least comprises one of infrared spectrum (FT-IR), Differential Scanning Calorimetry (DSC) and thermal cracking-gas chromatography mass spectrometry (Py-GC/MS).
The second aspect of the invention provides an application of the multi-dimensional quality evaluation method of the recycled plastic, which is applied to evaluating one of PP, PE, PS, ABS, PVC, PA, PC and polyester of the recycled plastic.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a multi-dimensional quality evaluation method of recycled plastics, which is used for evaluating the quality of the recycled plastics from a plurality of different aspects, is comprehensive and accurate, has very high practicability, can improve the market value of recycled products of the recycled plastics, is beneficial to recycling and reclassifying, and realizes the real resource recycling. And only by quickly determining the market value of the final recovered product, the recovery and classification of the waste plastics can be promoted in turn, so that the resource recycling in the true sense is realized.
The technical features, characteristics and advantages described in the present invention will be more readily understood by referring to the following detailed description.
Detailed Description
The technical features of the technical solutions provided by the present invention are further clearly and completely described below with reference to the specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The words "preferred", "preferably", "more preferred", and the like, in the present invention, refer to embodiments of the invention that may provide certain benefits, under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
A first aspect of the present invention provides a method for evaluating the multidimensional quality of recycled plastics, including at least: physical and mechanical performance test, safety test, odor grade test, metal content test, color test, molding surface test, impurity quantitative test and main body resin qualitative test.
The evaluation method of the recycled plastic is suitable for the recycled plastic which is prepared by taking the waste plastic as a raw material and carrying out screening, classification, cleaning, extrusion, melting and granulation (including granulation processes such as bracing, hot cutting and/or water cutting).
In some embodiments, the physical mechanical property test comprises at least: one of a melt flow rate test, a density test, an ash test, a tensile strength test, an elongation at break test, a flexural strength, a flexural modulus test, an impact strength test.
In some embodiments, the melt flow rate test is determined by: GB/T3682.1-2018.
In some embodiments, the ash test is determined by: GB/T9345.1-2008.
In some embodiments, the density test is determined by: GB/T1033.1-2008.
In some embodiments, the tensile strength test, elongation at break test, is determined by: GB/T1040.2-2006.
In some embodiments, the flexural strength, flexural modulus test is determined by: GB/T9341-2008.
In some embodiments, the impact strength test is determined by: GB/T1843-2008.
In some embodiments, the security test comprises at least: heavy metal content, polybrominated biphenyls (PBBs) and polybrominated diphenyl ethers (PBDEs), phthalates, Polycyclic Aromatic Hydrocarbons (PAHs), SVHC (substances of high interest).
(1) In some embodiments, the method for determining the heavy metal content is: GB/T26125-. Note: in the XRF rapid method, the content detection result of Cr (VI) is calculated by total Cr.
(2) In some embodiments, the polybrominated biphenyls (PBBs) and polybrominated diphenyl ethers (PBDEs) are measured by: GB/T26125-. Note: in the XRF rapid method, the content of bromine (polybrominated biphenyls, polybrominated diphenyl ethers) is measured as total Br.
(3) In some embodiments, the phthalate esters are determined by: GB/T29786-2013.
(4) In some embodiments, the Polycyclic Aromatic Hydrocarbons (PAHs) are determined by: SN/T1877.2-2007.
(5) In some embodiments, the SVHC (high interest substance) is determined by: the european union, No. 1907/2006 REACH regulation.
The corresponding instruments used during the safety test are shown in the attached table.
Attached watch
Figure BDA0002424500040000041
In some embodiments, the odor rating test is as described in GB/T24149.2-2017 below. The specific method comprises the following steps: a sample of 50g in weight was placed in a sealed glass jar of 1L volume and a sealing material of odorless silica gel, allowed to stand at 80. + -. 1 ℃ for 2 hours, cooled to 60. + -. 1 ℃ and then identified by an identifier.
And (4) grading:
class 1 odorless
Class 2 odorous but non-interfering, pungent odor
Grade 3 has obvious smell, but no interference and pungent smell
4-grade has interference and pungent odor
Grade 5 has strong interfering and irritating odor
Grade 6 has intolerable odor
Because the odor level is subjectively tested, differences between different assessors are taken into account. In the case of identification, the identification panel should consist of at least three persons. If the three-person identification results differ by more than two grades, the five-person group needs to be replaced to smell and identify again. The olfactive results are respectively removed from the highest value and the lowest value, and the average value of the rest results is the final odor grade.
In some embodiments, the metal content test method is: 1kg of recycled plastic particles are collectively spread out in an area of 1 square meter, and the recycled plastic particles are rolled for 1 time by a magnet rod, so that the number of the attracted iron-containing particles is calculated.
In some embodiments, the magnetic rod flux is 10000 gauss.
In some embodiments, the color test comprises at least one of an l.a.b value test, a gloss test, a transparency test.
In some embodiments, the gloss test is tested according to GB/T8807-1988.
In some embodiments, the test method for the transparency test is GB/T2410-.
In some embodiments, the test method of the molding surface test is: visually observing the injection-molded color plate by naked eyes, namely under the light of 700-900Lux, the distance between the human eyes and the color plate is 25-35cm, the distance between the light source and the color plate is 0.5-0.7m, the inspection angle is 45 degrees, and the sampling method is GB 2828.1-2003.
In some embodiments, the method of quantitative testing for impurities is: (1) preparing a sample: taking the regenerated plastic particles to be detected, and preparing a diaphragm to be detected; (2) impurity metering: measuring and counting the diameter of impurity points in the membrane to be measured; (3) and (3) calculating the impurity score: the points of different diameters correspond to different scores. And adding the corresponding scores of all the impurity points, wherein the total score is a quantitative result.
In some embodiments, the thickness of the membrane to be tested is 50-150 μm; the diameter is 100-200 mm.
In some embodiments, the thickness of the membrane to be tested is 100 μm; the diameter is 150 mm.
The inventor finds that the thickness of the diaphragm to be tested needs to be limited in the invention, and further finds that the accuracy of the test result is influenced by the excessively thick or thin thickness of the diaphragm to be tested. Excessive calendering of impurities can be caused by the fact that the thickness of the membrane to be measured is too thin, and the diameter is further enlarged; and the exposure probability of impurity points in the membrane to be measured can be reduced by excessively increasing the thickness of the membrane. Both of these two cases reduce the degree of discrimination in the quantification of impurities.
In some embodiments, the rank of the different color points in step (2) is divided into 10 ranks, and the rank is divided into: the diameter of the impurity point is less than or equal to 0.1mm, the diameter of the impurity point is less than or equal to 0.2mm and less than or equal to 0.3mm, the diameter of the impurity point is less than or equal to 0.3mm and less than or equal to 0.4mm and less than or equal to 0.2mm, the diameter of the impurity point is less than or equal to 0.5mm and less than or equal to 0.6mm, the diameter of the impurity point is less than or equal to 0.7mm and less than or equal to 0.8mm, the diameter of the impurity point is less than or equal to 0.9mm and less than or equal.
In some embodiments, in step (3), the score corresponding to each impurity point in each grade is evaluated as follows: 1 minute is the diameter of the impurity point which is less than or equal to 0.1mm, 4 minutes is the diameter of the impurity point which is more than 0.1mm and less than or equal to 0.2mm, 9 minutes is the diameter of the impurity point which is more than 0.2mm and less than or equal to 0.3mm, 16 minutes is the diameter of the impurity point which is more than 0.4mm and less than or equal to 0.5mm, 25 minutes is the diameter of the impurity point which is more than 0.5mm and less than or equal to 0.6mm, 36 minutes is the diameter of the impurity point which is more than 0.5mm and less than or equal to 0.6mm, 49 minutes is the diameter of the impurity point which is more than 0.6mm and less than or equal to 0.7mm, 64 minutes is the diameter of the impurity point which is more than or equal to 0.8mm and less than or equal to 0.
In the invention, the corresponding scores of the impurity points with different diameters are as above, the score of the impurity point in each diameter range is the product of the number of the impurity points and the corresponding score of the impurity point, and finally, the total score of the impurity points is calculated.
In some embodiments, the characterization of the host resin includes at least one of infrared spectroscopy (FT-IR), Differential Scanning Calorimetry (DSC), thermal cracking-gas chromatography mass spectrometry (Py-GC/MS).
(1) In some embodiments, the infrared spectroscopy (FT-IR) is determined by: GB/T6040-.
(2) In some embodiments, the Differential Scanning Calorimetry (DSC) measurement method is: GB/T19466.2-2004, SN/T2928.12011, SN/T3095-
(3) In some embodiments, the thermal cracking-gas chromatography mass spectrometry (Py-GC/MS) is determined by: GB/T7131-1986, SN/T2928.12011.
The second aspect of the invention provides an application of the multi-dimensional quality evaluation method for the recycled plastics, which is applied to evaluation of one of PP, PE, PS, ABS, PVC, PA, PC and polyester of the recycled plastics.
The present invention is described in detail below with reference to examples, which are provided for the purpose of further illustration only and are not to be construed as limiting the scope of the present invention, and the insubstantial modifications and adaptations thereof by those skilled in the art based on the teachings of the present invention will still fall within the scope of the present invention.
Example 1
A multi-dimensional quality evaluation method for recycled plastics comprises the following steps: physical and mechanical performance test, safety test, odor grade test, metal content test, color test, molding surface test, impurity quantitative test and main body resin qualitative test.
The recycled plastic particles are PS resin, and the test results are shown in tables 1 and 1-1.
TABLE 1
Figure BDA0002424500040000071
Figure BDA0002424500040000081
TABLE 1-1 results of impurity quantification
Figure BDA0002424500040000082
Example 2
A multi-dimensional quality evaluation method for recycled plastics comprises the following steps: physical and mechanical performance test, safety test, odor grade test, metal content test, color test, molding surface test, impurity quantitative test and main body resin qualitative test.
The recycled plastic particles are PE resin, and the test results are shown in tables 2 and 2-1.
TABLE 2
Figure BDA0002424500040000083
Figure BDA0002424500040000091
TABLE 2-1 results of impurity quantification
Figure BDA0002424500040000092
Example 3
A multi-dimensional quality evaluation method for recycled plastics comprises the following steps: physical and mechanical performance test, safety test, odor grade test, metal content test, color test, molding surface test, impurity quantitative test and main body resin qualitative test.
The recycled plastic particles are PP resin, and the test results are shown in tables 3 and 3-1.
TABLE 3
Figure BDA0002424500040000101
Figure BDA0002424500040000111
TABLE 3-1 results of impurity quantification
Figure BDA0002424500040000112
Example 4
A multi-dimensional quality evaluation method for recycled plastics comprises the following steps: physical and mechanical performance test, safety test, odor grade test, metal content test, color test, molding surface test, impurity quantitative test and main body resin qualitative test.
The recycled plastic particles are ABS resin, and the test results are shown in tables 4 and 4-1.
TABLE 4
Figure BDA0002424500040000113
Figure BDA0002424500040000121
TABLE 4-1 results of impurity quantification
Figure BDA0002424500040000122
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may modify or change the technical content disclosed above into an equivalent embodiment with equivalent changes, but all those simple modifications, equivalent changes and modifications made on the above embodiment according to the technical spirit of the present invention still belong to the protection scope of the present invention.

Claims (10)

1. A multi-dimensional quality evaluation method for recycled plastics, characterized by comprising: physical and mechanical performance test, safety test, odor grade test, metal content test, color test, molding surface test, impurity quantitative test and main body resin qualitative test.
2. The method for multi-dimensional quality evaluation of recycled plastics according to claim 1, wherein the test of physical mechanical properties comprises at least: one of a melt flow rate test, a density test, an ash test, a tensile strength test, an elongation at break test, a flexural strength, a flexural modulus test, an impact strength test.
3. The method for multidimensional quality assessment of recycled plastics according to claim 1, characterized in that said safety test comprises at least: heavy metal content, polybrominated biphenyls (PBBs) and polybrominated diphenyl ethers (PBDEs), phthalates, Polycyclic Aromatic Hydrocarbons (PAHs), SVHC (substances of high interest).
4. The multi-dimensional quality evaluation method of recycled plastics according to claim 1, wherein the metal content test method comprises: 1kg of recycled plastic particles are collectively spread out in an area of 1 square meter, and the recycled plastic particles are rolled for 1 time by a magnet rod, so that the number of the attracted iron-containing particles is calculated.
5. The method of claim 4, wherein the magnetic flux of the magnetic bar is 10000 Gauss.
6. The method of claim 1, wherein the color test comprises at least one of L.a.b. value, gloss, and transparency.
7. The method for evaluating the multidimensional quality of the recycled plastic as claimed in claim 1, wherein the method for quantitatively testing the impurities comprises the following steps:
(1) preparing a sample: taking the regenerated plastic particles to be detected, and preparing a diaphragm to be detected;
(2) impurity metering: measuring and counting the diameter of impurity points in the membrane to be measured;
(3) and (3) calculating the impurity score: the points of different diameters correspond to different scores. And adding the corresponding scores of all the impurity points, wherein the total score is a quantitative result.
8. The multi-dimensional quality evaluation method of recycled plastics according to claim 7, wherein the thickness of the film to be measured is 50 to 150 μm; the diameter is 100-200 mm.
9. The method for evaluating the multidimensional quality of the recycled plastic as recited in claim 1, wherein the main resin qualitative analysis comprises at least one of infrared spectroscopy (FT-IR), Differential Scanning Calorimetry (DSC) and thermal cracking-gas chromatography mass spectrometry (Py-GC/MS).
10. Use of the method for the multidimensional quality assessment of recycled plastics according to any of claims 1 to 9, characterized in that it is used for the assessment of one of the recycled plastics PP, PE, PS, ABS, PVC, PA, PC, polyester.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114705516A (en) * 2021-04-27 2022-07-05 上海睿聚环保科技有限公司 Method for measuring impurity content of recycled plastic and application thereof
CN114764099A (en) * 2021-05-07 2022-07-19 上海睿聚环保科技有限公司 Evaluation system for evaluating quality of regenerated plastic at multiple angles
CN114939941A (en) * 2021-07-02 2022-08-26 上海睿聚环保科技有限公司 Incoming material inspection and evaluation method for recycled plastic raw material
CN116100703A (en) * 2022-12-30 2023-05-12 玫瑰塑胶(昆山)有限公司 Method and system for manufacturing plastic product by using recycled material

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114705516A (en) * 2021-04-27 2022-07-05 上海睿聚环保科技有限公司 Method for measuring impurity content of recycled plastic and application thereof
CN114764099A (en) * 2021-05-07 2022-07-19 上海睿聚环保科技有限公司 Evaluation system for evaluating quality of regenerated plastic at multiple angles
CN114939941A (en) * 2021-07-02 2022-08-26 上海睿聚环保科技有限公司 Incoming material inspection and evaluation method for recycled plastic raw material
CN116100703A (en) * 2022-12-30 2023-05-12 玫瑰塑胶(昆山)有限公司 Method and system for manufacturing plastic product by using recycled material
CN116100703B (en) * 2022-12-30 2023-11-14 玫瑰塑胶(昆山)有限公司 Method and system for manufacturing plastic product by using recycled material

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