CN114806007A - Plastic-based volatile organic compound standard sample and preparation method thereof - Google Patents

Plastic-based volatile organic compound standard sample and preparation method thereof Download PDF

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CN114806007A
CN114806007A CN202210335740.5A CN202210335740A CN114806007A CN 114806007 A CN114806007 A CN 114806007A CN 202210335740 A CN202210335740 A CN 202210335740A CN 114806007 A CN114806007 A CN 114806007A
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voc
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CN114806007B (en
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单长国
庞承焕
吴博
李卫领
谢晓琼
陈平绪
叶南飚
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Guogao High Polymer Material Industry Innovation Center Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01N30/04—Preparation or injection of sample to be analysed
    • G01N30/06—Preparation

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Abstract

The invention discloses a plastic-based volatile organic compound standard sample and a preparation method thereof. The plastic-based VOC standard sample comprises a matrix, VOC, white oil and an antioxidant, wherein the matrix is thermoplastic plastic with a melting point of less than or equal to 200 ℃, and the concentration of the VOC in the plastic-based VOC standard sample is 50 ng/kg-100 mg/kg. The preparation method comprises the following steps: blending thermoplastic plastics with the average particle size of 50-100 mu m, white oil dissolved with VOC and an antioxidant, and uniformly stirring in a closed system at the temperature of less than or equal to-30 ℃ to obtain a mixture; and (4) performing injection molding to obtain the plastic-based VOC standard sample. The invention develops a plastic-based VOC standard sample with excellent uniformity, which is suitable for VOC measurement of solid materials.

Description

Plastic-based volatile organic compound standard sample and preparation method thereof
Technical Field
The invention relates to the technical field of analysis and detection, in particular to a plastic-based volatile organic compound standard sample and a preparation method thereof.
Background
Volatile Organic Compounds (VOCs) mainly include aromatic hydrocarbons (benzene, toluene, xylene), ketones and aldehydes, amines, halides, thiohydrocarbons, unsaturated hydrocarbons, etc. The VOC is mainly industrial waste gas and automobile exhaust gas generated by fuel combustion and transportation; combustion products such as indoor coal and natural gas, smoke for smoking, heating, cooking, and the like; building and decorative materials, furniture, household appliances, automotive upholstery production, cleaning agents and the like. In the process of interior decoration, VOC mainly comes from paints, coatings and adhesives, solvent-type release agents.
When the concentration of VOC reaches a certain level, people feel headache, nausea, etc. in a short time, and in severe cases, twitch occurs, and the liver, kidney, brain and nervous system of people are injured. In order to control VOC, the government of China sets national standards for the unorganized emission control of volatile organic compounds (GB37822-2019), and emission standards of industrial atmospheric pollutants for coatings, paints and adhesives (GB37824-2019) and the like; corresponding standards are also established in various industries, such as automobile VOC standard 'method for sampling and measuring volatile organic compounds and aldehyde ketone substances in automobiles' (HJ/T400) and 'guidance for evaluating air quality in passenger automobiles' (GB/T27630).
When testing the VOC content according to various standards, corresponding VOC standard samples are required. At present, the VOC standard sample is mainly VOC standard liquid taking a liquid solvent as a matrix. For example, a single standard or mixed standard of VOC with methanol as a matrix solvent, and a mixed standard of VOC with carbon disulfide as a matrix solvent. The prior art discloses a preparation method of a standard substance for detecting the residual amount of ketones in paper for cigarettes, wherein the prepared ketone standard substance is a liquid standard substance taking triacetin as a matrix.
However, the above-mentioned VOC liquid standard has many inconveniences in practical use: (1) the standard substance using the organic solvent as the matrix can cause unstable concentration of the standard substance due to easy volatilization of the organic solvent, so that the measurement result has deviation; (2) the liquid VOC standard sample, which is more suitable for calibrating instruments or drawing standard curves to determine the VOC content in gas or the VOC content in liquid materials, does not completely reflect the VOC content in solid materials (such as plastics).
Therefore, there is a need to develop a plastic-based VOC standard.
Disclosure of Invention
In order to overcome the defects of the plastic-based VOC standard sample in the prior art, the invention provides a preparation method of the plastic-based VOC standard sample, which comprises the steps of blending white oil dissolved with VOC and specific plastic powder, and then carrying out injection molding in a closed system.
The invention also aims to provide the plastic-based VOC standard sample prepared by the preparation method.
In order to solve the technical problems, the invention adopts the technical scheme that:
the plastic-based VOC standard sample comprises a matrix, VOC, white oil and an antioxidant, wherein the matrix is thermoplastic plastic with a melting point of less than or equal to 200 ℃, and the concentration of the VOC in the plastic-based VOC standard sample is 50 ng/kg-100 mg/kg.
The plastic-based VOC standard sample takes thermoplastic as a matrix, one or more VOC substances are uniformly dispersed in the matrix, and the total concentration of VOC is 50 ng/kg-100 mg/kg. The plastic-based VOC standard sample disclosed by the invention is good in uniformity and stability, the VOC concentration fixed value is not easy to deviate due to environmental change, and the plastic-based VOC standard sample is suitable for the VOC quantitative detection in a solid material.
Preferably, the matrix is polypropylene (PP) and/or Polyethylene (PE).
The melting point of PP is about 189 ℃ and that of PE is 150 ℃ or lower.
Preferably, the melt flow rate of the PP at 230 ℃ and 2.16kg is 19-27 g/10 min.
Preferably, the melt flow rate of the PE at 190 ℃ and 2.16kg is 1.7-2.3 g/10 min.
The VOC is one or more of aromatic hydrocarbons, ketones and aldehydes, amines, halogenated hydrocarbons, thio-hydrocarbons or unsaturated hydrocarbons.
Optionally, the VOC is one or more of benzene, toluene, xylene, p-dichlorobenzene, styrene, formaldehyde, acetaldehyde, n-butanol, acetophenone, acetone, methyl ethyl ketone, methanol, ethanol, n-butyl acetate, nitrobenzene, trichloroethylene, or dichloromethane.
The white oil is mineral oil and is generally added as a dispersant in a plastic product, in the preparation method, the white oil and a matrix are blended and then do not need to be removed, the mixture can be directly subjected to injection molding, the white oil does not contain VOC substances, and the VOC concentration measurement cannot be negatively influenced.
Preferably, the kinematic viscosity @40 ℃ of the white oil is 5.7-46 mm 2 /S。
More preferably, the kinematic viscosity @40 ℃ of the white oil is 10-31 mm 2 /S。
The detection method of the kinematic viscosity of the white oil is GB/T265-1988.
The white oil in the kinematic viscosity range has excellent compatibility with thermoplastic plastics in the injection molding process, is beneficial to uniform dispersion of VOC, and improves the concentration uniformity of a plastic-based VOC standard sample.
Preferably, the white oil is one or more of No. 10 white oil, No. 15 white oil, No. 26 white oil, No. 30 white oil and No. 32 white oil.
Preferably, the mass concentration ratio of the VOC to the white oil is (10 ng-10 mg) to 1 ml.
Preferably, the plastic-based VOC standard sample is stored hermetically at a temperature of ≦ -4 ℃.
The VOC content of the plastic-based VOC standard sample is detected to be less than 3.02 through uniformity detection.
The invention also provides a preparation method of the plastic-based VOC standard sample, which comprises the following steps:
s1, blending thermoplastic plastics with the average particle size of 50-100 mu m, white oil dissolved with VOC and an antioxidant, and uniformly stirring in a closed system at the temperature of less than or equal to-30 ℃ to obtain a mixture;
s2, conveying the mixture to an injection molding machine through a metal pipeline, and performing injection molding to obtain the plastic-based VOC standard sample; the temperature of the injection molding is less than or equal to 200 ℃.
In the preparation method, the VOC is dissolved in the white oil, then the white oil, the powdery thermoplastic plastic and the antioxidant are mixed, and the mixture is stirred at a lower temperature, so that the white oil dissolved with the VOC is uniformly adhered to the surface of the plastic powder, and the VOC is uniformly dispersed. The stirring process is under the protection of liquid nitrogen or dry ice, and the air in the stirring cavity is removed, so that the possible VOC gas interference in the air is avoided, the low-temperature stirring can be kept, and the volatilization of VOC is avoided.
The mixture prepared in the step S1 is directly added to an injection molding machine for injection molding without melt extrusion granulation, so that VOC loss caused by vacuumizing and VOC volatilization caused by high-speed stirring and high-shear action of the extruder in the extrusion granulation process are avoided.
The inventors have found that not all powdered thermoplastics can be directly injection molded without extrusion pelletization after mixing with white oil. The melting point of the thermoplastic plastic is less than or equal to 200 ℃, the injection molding performance is good, and the thermoplastic plastic can be directly subjected to injection molding after being blended with other components without extrusion granulation.
The average particle size of the thermoplastic plastic is not too large or too small, white oil is difficult to adhere uniformly when the particle size is too large, the VOC distribution is not uniform, the prepared plastic-based VOC standard sample is poor in uniformity, and the prepared plastic-based VOC standard sample is easy to agglomerate and difficult to effectively disperse when the particle size is too small.
Preferably, the outer layer of the metal pipeline is sealed and protected by liquid nitrogen, the injection port of the injection molding machine adopts low temperature and sealing treatment, and the injection molding machine is provided with compressed air by an air compressor.
Preferably, the thermoplastic plastic with the average particle size of 50-100 μm is obtained by crushing and screening granular or film-shaped thermoplastic plastic.
Preferably, the average particle size of the thermoplastic plastic is 55-70 μm.
Preferably, the antioxidant comprises a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is a hindered phenol antioxidant, and the auxiliary antioxidant is a phosphate antioxidant.
Optionally, the primary antioxidant is one or more of antioxidant 1010, antioxidant 1076 or antioxidant 1790.
Optionally, the auxiliary antioxidant is one or more of antioxidant 168, antioxidant PEP-Q or antioxidant PEP-36.
Preferably, the rotation speed for uniformly stirring in the step S1 is 50-100 r/min.
Preferably, the injection molding process comprises: the nozzle temperature is 85-120 ℃, the first zone temperature is 180-200 ℃, the second zone temperature is 180-200 ℃, and the third zone temperature is 180-200 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a VOC standard sample taking plastic as a matrix, which is prepared by dissolving VOC in white oil, mixing the white oil with powdery thermoplastic and an antioxidant, and directly performing injection molding without performing melt extrusion granulation.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The starting materials in the examples are all commercially available:
PP resin-1, purchased from Yanshan petrochemical, K7726, obtained by crushing and screening granular PP resin, having a melt flow rate of 25g/10min at 230 ℃ under 2.16 kg;
PP resin-2, purchased from Yanshan petrochemical, C1611, obtained by crushing and screening granular PP resin, having a melt flow rate of 10g/10min at 230 ℃ under 2.16 kg;
PE resin-1, purchased from Daqing petrochemical DFDA-7042, obtained by pulverizing and sieving granular PE resin, and having a melt flow rate of 2.1g/10min at 190 deg.C under 2.16 kg;
PE resin-2, purchased from Yanshan petrochemical B205, obtained by crushing and screening granular PE resin, with a melt flow rate of 1.0g/10min at 190 ℃ under 2.16 kg;
white oil No. 1, 10 white oil purchased from Taoyou petrochemical company and having a kinematic viscosity @40 ℃ of 10mm 2 /S；
White oil No. 2, 32 white oil purchased from Taoyou petrochemical company and having a kinematic viscosity @40 ℃ of 31mm 2 /S；
White oil-3, Primol 352, (USA) Esso Petroleum company, kinematic viscosity @40 ℃ 67.0mm 2 /S；
The VOC standard substance comprises benzene, toluene, dimethylbenzene, ethylbenzene, styrene, formaldehyde, acetaldehyde and acrylic acid, wherein the mass ratio of the VOC standard substance to the acrylic acid is 1: 1: 1: 1: 1: 1: 1: 1, purchased from alatin, AR grade;
the antioxidant, commercially available, is a mixture of antioxidant 1010 and antioxidant 168.
Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Example 1
Example 1 provides a plastic-based VOC standard sample prepared as follows:
s1, dissolving a VOC standard substance into white oil (white oil-1, 10 # white oil), wherein the mass concentration ratio of the VOC standard substance to the white oil is 10 ng: 1 ml;
blending thermoplastic (PE resin-1 with an average particle size of 55 μm), VOC-dissolved white oil and an antioxidant according to a mass ratio of 98.5: 1: 0.5; introducing liquid nitrogen into a closed system, keeping the temperature at minus 40 to minus 30 ℃, and uniformly stirring at the rotating speed of 50r/min to obtain a mixture;
s2, conveying the mixture to an injection molding machine through a metal pipeline, and performing injection molding to obtain a plastic-based VOC standard sample;
the outer layer of the metal pipeline is sealed and protected by liquid nitrogen, the injection port of the injection molding machine adopts low temperature and sealing treatment, and the injection molding machine is provided with compressed air by an air compressor;
the injection molding process comprises the following steps: the nozzle temperature is 85-120 ℃, the first zone temperature is 180-200 ℃, the second zone temperature is 180-200 ℃, and the third zone temperature is 180-200 ℃.
The single batch preparation amount of the plastic-based VOC standard sample in example 1 is 10kg, and the VOC standard sample can be diluted in proportion and then accurately added to obtain an accurate mass concentration ratio of the VOC standard sample to the white oil.
And cooling the prepared plastic-based VOC standard sample, and sealing by using an aluminum film sealing bag.
Example 2
Example 2 provides a plastic-based VOC standard sample, which is prepared by the method different from example 1:
in step S1, the thermoplastic plastic is PP resin-1, and the average grain diameter is 70 μm;
in step S1, the rotation speed for stirring is 100 r/min.
Example 3
Example 3 provides a plastic-based VOC standard sample, which is prepared by the method different from example 1:
in step S1, the white oil used is white oil No. 2, 32.
Example 4
Example 3 provides a plastic-based VOC standard sample, which is prepared by the method different from example 1:
in step S1, the white oil used was white oil-3, Primol 352.
Example 5
Example 5 provides a plastic-based VOC standard sample, which is prepared by the method different from example 1:
in step S1, the thermoplastic resin has an average particle diameter of 100. mu.m.
Example 6
Example 6 provides a plastic-based VOC standard sample, which is prepared by the method different from example 1:
in step S1, the mass concentration ratio of the VOC standard substance to the white oil is 10 mg: 1 ml.
Example 7
Example 7 provides a plastic-based VOC standard sample, which is prepared by the method different from example 2: in step S1, the thermoplastic is PP resin-2.
Example 8
Example 8 provides a plastic-based VOC standard sample, which is prepared by the method different from example 1:
in step S1, the thermoplastic resin is PE resin-2.
Comparative example 1
Comparative example 1 provides a plastic-based VOC standard sample, which is prepared by a method different from example 1 in that:
in step S1, the thermoplastic polymer has an average particle diameter of 150. mu.m.
Comparative example 2
Comparative example 2 provides a plastic-based VOC standard sample, which is prepared by a method different from example 1 in that:
in step S1, the thermoplastic polymer has an average particle diameter of 5 μm.
Comparative example 3
Comparative example 3 provides a plastic-based VOC standard sample, which is prepared by a method different from example 1 in that:
in step S1, the mixture is stirred uniformly at a temperature of 0 ℃.
Comparative example 4
Comparative example 4 provides a plastic-based VOC standard sample, which is prepared by a method different from example 1 in that:
the white oil and other substances are replaced by methanol.
Performance testing
The uniformity test of the plastic-based VOC standard samples prepared in the above examples and comparative examples was carried out by the following specific method:
m1, in the production process of the injection molding in the step S2, extracting 10 plastic-based VOC standard samples as test samples in equal time, wherein each sample is 100g, and packaging and storing the samples in a sealed bag at a constant temperature and humidity of 10 ℃ for later use;
m2, placing the test sample into a prepared sample bag, placing the sample bag into a (60 +/-0.5 ℃) oven, and carrying out heat treatment for 2 hours; the gas was trapped using a TENAX tube and a DNPH tube sampling tube, respectively, using the following specific trapping methods:
Figure BDA0003576678550000071
m3, after gas trapping is finished, directly placing the TENAX tube into a TD-GC/MS test, eluting the DNPH tube into a 5mL volumetric flask with 5mL acetonitrile, carrying out constant volume, transferring to a sample injection bottle, and carrying out HPLC test;
the test consisted of 2 replicates and the F value was calculated, according to CNAS-GL 03: 2006 evaluation of sample homogeneity, where F < F 0.05 (3.02) considering the uniformity of the sample to be qualified;
the HPLC test conditions are as follows:
using a high performance liquid chromatograph: agilent, HP 1200; a chromatographic column: ZORBAX Eclipse XDB-C185 μ 4.6 x 250 mm; mobile phase: acetonitrile: 75 parts of water: 25; flow rate: 1 ml/min; detection wavelength: 360 nm; detection time: 30 min;
the TD-GC/MS test conditions are as follows:
TD conditions: heating temperature: 280 ℃; desorption time: 10 min; desorption flow rate: 40 ml/min; cold trap temperature: -30 ℃; cold trap heating temperature: 280 ℃; carrier gas: helium gas;
GC conditions were as follows:
a chromatographic column: DB-5MS,60m-0.25mm 0.25 um; temperature rising procedure: maintaining the initial temperature at 40 deg.C for 3min, heating to 100 deg.C at 10 deg.C/min for 3min, and heating to 280 deg.C at 10 deg.C/min for 3 min;
MS conditions: and (3) selecting a compound characteristic mass ion peak area quantification in a full scanning mode, wherein the scanning range is 35-500 u, and the electron bombardment energy is 70 Ev.
The results of the homogeneity test for the plastic-based VOC standard sample of example 1 are shown in table 1.
Table 1 results of uniformity testing for example 1
Figure BDA0003576678550000072
Figure BDA0003576678550000081
The results of the homogeneity test for the plastic-based VOC standard sample of example 2 are shown in table 2.
Table 2 results of uniformity testing for example 2
Figure BDA0003576678550000082
The results F of the uniformity test for the plastic-based VOC standards prepared in each example and comparative example are shown in table 3.
TABLE 3 results of uniformity test F values of examples and comparative examples
Figure BDA0003576678550000091
Through tests, the average value of the VOC content in the plastic-based VOC standard samples of the examples 3-5 and 7-8 is close to the test results of the examples 1 and 2, and is within the range of 50-100 ng/kg, and the average value of the VOC content in the plastic-based VOC standard sample of the example 6 is 91.3 mg/kg. The average VOC content of the plastic-based VOC standard samples of comparative examples 1-4 was 74.56ng/kg, 71.69ng/kg, 41.22ng/kg, and 38.65ng/kg, respectively.
According to the test results in tables 1 to 3, the VOC content in the plastic-based VOC standard samples prepared by the invention has excellent uniformity, and the F values of the test samples of examples 1 to 8 are far lower than 3.02. The F values of the plastic-based VOC standard samples prepared by the comparative examples are all larger than 3.02, the uniformity is poor, and the plastic-based VOC standard samples cannot be used as standard substances for VOC content detection.
The average particle size of the thermoplastic in comparative example 1 was too large, and it was difficult to uniformly adhere the white oil during the stirring in step S1; the average particle size of the thermoplastic in comparative example 2 was too small, the thermoplastic powder was easily agglomerated and could not be effectively dispersed, and although the average value of the VOC content in the plastic-based VOC standard samples of comparative examples 1 and 2 was in the range of 50ng/kg to 100mg/kg, the VOC distribution was not uniform. It can be seen that when the average particle size of the thermoplastic is too large or too small, acceptable plastic-based VOC standards cannot be made.
In comparative example 3, the temperature for the uniform stirring in step S1 was 0 ℃, causing a partial loss of the VOC components during the stirring, affecting the uniformity of distribution thereof.
In comparative example 4, VOC was dissolved in methanol. Methanol is a commonly used liquid VOC standard sample carrier, but in the application, the VOC is dissolved by the methanol and then is melted and extruded, so that the VOC loss is excessive, and the uniformity of the prepared plastic-based VOC standard sample is poor.
The stability test of the plastic-based VOC standard samples prepared in the above examples and comparative examples is carried out by the following specific method:
the above examples and comparative examples are sealed and stored for 3 months at the temperature of less than or equal to-4 ℃;
then, in the above examples and comparative examples, 3 packets of samples were randomly sampled and tested according to the uniformity test conditions; weighing two samples per bag, measuring twice under repetitive conditions, calculating average value of measurement, and calculating instability standard deviation by instability standard deviation method
Figure BDA0003576678550000092
And 0.3 σ; if the standard deviation of instability is less than or equal to 0.3 sigma, the article is considered to be stable, and the statistical results are shown in Table 4.
Table 4 stability test results of examples and comparative examples
Figure BDA0003576678550000101
According to the above table, it can be seen that, in the plastic-based VOC standard sample prepared by the invention, the instability standard deviation of the sample is less than or equal to 0.3 σ after the aluminum film bag is sealed and stored for 3 months at the temperature of less than or equal to-4 ℃, i.e. the stability is excellent.
The instability standard deviation of the plastic-based VOC standard samples of the comparative examples 1-4 is larger than 0.3 sigma, the stability is poor, and the requirement of long-term storage and use of the standard samples cannot be met.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The plastic-based VOC standard sample is characterized by comprising a matrix, VOC, white oil and an antioxidant, wherein the matrix is thermoplastic plastic with a melting point of not more than 200 ℃, and the concentration of the VOC in the plastic-based VOC standard sample is 50 ng/kg-100 mg/kg.
2. The plastic-based VOC standard sample of claim 1, wherein said matrix is PP and/or PE.
3. The plastic-based VOC standard sample as claimed in claim 2, wherein said PP has a melt flow rate of 19.0-27.0 g/10min at 230 ℃ under 2.16 kg; the melt flow rate of the PE at 190 ℃ under the condition of 2.16kg is 1.7-2.3 g/10 min.
4. The plastic-based VOC standard sample of claim 1, wherein said VOC is one or more of aromatic, ketone, aldehyde, amine, halogenated, thio-hydrocarbon or unsaturated hydrocarbon volatile organic compounds.
5. The plastic-based VOC standard sample as claimed in claim 1, wherein said white oil has a kinematic viscosity @40 ℃ of 5.7-46 mm 2 /S。
6. The plastic-based VOC standard of claim 1, wherein the mass concentration ratio of VOC to white oil is from about 10ng to about 10mg to about 1 ml.
7. The method for preparing the plastic-based VOC standard sample as claimed in any one of claims 1 to 6, characterized by comprising the following steps:
s1, blending thermoplastic plastics with the average particle size of 50-100 mu m, white oil dissolved with VOC and an antioxidant, and uniformly stirring in a closed system at the temperature of less than or equal to-30 ℃ to obtain a mixture;
s2, conveying the mixture to an injection molding machine through a metal pipeline, and performing injection molding to obtain the plastic-based VOC standard sample; the temperature of the injection molding is less than or equal to 200 ℃.
8. The method according to claim 7, wherein the thermoplastic polymer has an average particle diameter of 55 to 70 μm.
9. The preparation method according to claim 7, wherein the rotation speed for stirring uniformly in step S1 is 50-100 r/min.
10. The manufacturing method according to claim 7, wherein the injection molding process comprises: the nozzle temperature is 85-120 ℃, the first zone temperature is 180-200 ℃, the second zone temperature is 180-200 ℃, and the third zone temperature is 180-200 ℃.
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CN112795093A (en) * 2020-12-31 2021-05-14 国高材高分子材料产业创新中心有限公司 Resin-based aldehyde ketone standard substance and preparation method thereof

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