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GB/T 30925-2014: Plastics -- Ethylene-vinyl acetate copolymer (EVAC) thermoplastics -- Determination of vinyl acetate content
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Plastics -- Ethylene-vinyl acetate copolymer (EVAC) thermoplastics -- Determination of vinyl acetate content
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GB/T 30925-2014
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Basic data | Standard ID | GB/T 30925-2014 (GB/T30925-2014) | | Description (Translated English) | Plastics -- Ethylene-vinyl acetate copolymer (EVAC) thermoplastics -- Determination of vinyl acetate content | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G31 | | Classification of International Standard | 83.080.20 | | Word Count Estimation | 18,149 | | Date of Issue | 7/8/2014 | | Date of Implementation | 12/1/2014 | | Quoted Standard | GB/T 28212-2011 | | Adopted Standard | ISO 8985-1998, MOD | | Regulation (derived from) | 2014 National Standards Bulletin No. 18 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the determination of ethylene - Test methods vinyl acetate content of the vinyl acetate copolymer (EVAC). This standard specifies test methods, including reference methods and test methods. Wherein the reference method for ethylene | GB/T 30925-2014: Plastics -- Ethylene-vinyl acetate copolymer (EVAC) thermoplastics -- Determination of vinyl acetate content
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Plastics. Ethylene-vinyl acetate copolymer (EVAC) thermorlastics. Determination of vinyl acetate content
ICS 83.080.20
G31
National Standards of People's Republic of China
Plastic ethylene - vinyl acetate copolymer (EVAC,)
Determination of thermoplastic vinyl acetate content of
Plastics-Ethylene-vinylacetatecopolymer (EVAC) thermoplastics-
(ISO 8985.1998, MOD)
Issued on. 2014-07-08
2014-12-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
This standard uses redrafted law revision using ISO 8985.1998 "Plastics ethylene - vinyl acetate copolymer (EVAC) thermoplastics
Determination of plastic vinyl acetate ester content. "
This standard and ISO 8985.1998 technical differences are as follows.
--- Modify the test range infrared spectroscopy vinyl acetate content by not less than 10% to not less than 3% (see Chapter 1);
--- Increased infrared spectroscopy for ethylene content calculated absorption 720cm-1,2020cm-1 (see 4.1.1);
--- Modified infrared spectroscopy test equipment, infrared spectrometer to Fourier transform infrared spectrometer (see 4.1.2.1);
--- Modified infrared spectroscopy instrument wave number range from 4000cm-1 ~ 600cm-1 to 4000cm-1 ~ 400cm-1
(See 4.1.2.1);
--- Infrared spectroscopy modified test procedure, the test procedure according to a Fourier transform infrared spectrometer operation (see 4.1.3.2);
--- Modified infrared spectroscopy and infrared spectra of the example in Figure absorbance is calculated (see 4.1.3.2.5);
--- Modified infrared spectroscopy calibration curve example (see 4.1.3.3).
The standard proposed by China Petroleum and Chemical Corporation.
This standard by the National Standardization Technical Committee of plastic resins and petrochemical plastics Technical Committee (SAC/TC15/SC1) technology
Centralized.
This standard is drafted by. China Petroleum and Chemical Corporation Beijing Yanshan Company Resin Application Research Institute.
Participated in the drafting of this Standard. China Petroleum and Chemical Corporation Beijing Yanshan Branch of Quality Supervision and Inspection Center, Qingdao immigration
Inspection and Quarantine, Beijing Eastern Petrochemical Co., Ltd. organic chemical plant, Yangzi - BASF limited liability company, Beijing Huamei Polymer Co.
the company.
The main drafters of this standard. Lijing Qing, Gao Jianguo, Wang Min, Huang Liu, Gao Yan thought Juan.
Plastic ethylene - vinyl acetate copolymer (EVAC,)
Determination of thermoplastic vinyl acetate content of
1 Scope
This standard specifies the determination of ethylene - Test methods vinyl acetate content of the vinyl acetate copolymer (EVAC).
This standard specifies test methods, including reference methods and test methods. Wherein the reference method for ethylene - vinyl acetate copolymer
Calibration vinyl acetate content of the test method.
After the test methods specified in this standard with the reference method for calibration, such as acceptable reproducibility of test results, you can use the test method
Determination of vinyl acetate content.
This standard specifies the test methods in infrared spectroscopy applied to vinyl acetate content of not less than 3% of EVAC samples.
NOTE. ethylene - vinyl acetate copolymer is abbreviated EVAC often use EVA.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 28212-2011 laboratory glassware condenser
3 baseline methodology
3.1 Reference Method 1. Hydrolysis - back titration
3.1.1 Principle
The sample was dissolved in xylene, was added potassium hydroxide - ethanol solution so that the hydrolysis of the acetate group. Then adding excess sulfuric acid or hydrochloric acid, to
Phenolphthalein as an indicator, with sodium hydroxide standard solution titrate the excess acid.
3.1.2 Reagents
Analysis using analytical reagent.
3.1.2.1 xylene.
3.1.2.2 sulfuric acid concentration of about 5g/L, or hydrochloric acid, a concentration of about 3.7g/L.
3.1.2.3 KOH - ethanol, a concentration of about 5.6g/L.
The solid was 5.6g of potassium hydroxide was dissolved in 500mL of ethanol, and then diluted to 1000mL. After standing for 24h, supernatant.
3.1.2.4 standard sodium hydroxide solution, c (NaOH) = 0.1mol/L.
3.1.2.5 phenolphthalein indicator. 0.7g of phenolphthalein was dissolved in 100mL of ethanol.
3.1.3 Instruments
Usual laboratory equipment and the following.
3.1.3.1 Buret capacity 50mL.
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