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GB/T 32364-2015: Plastics -- Phenolic resins -- Determination of pH
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| GB/T 32364-2015 | English | 239 |
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Plastics -- Phenolic resins -- Determination of pH
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GB/T 32364-2015
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Basic data | Standard ID | GB/T 32364-2015 (GB/T32364-2015) | | Description (Translated English) | Plastics -- Phenolic resins -- Determination of pH | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G32 | | Classification of International Standard | 83.080.01 | | Word Count Estimation | 11,131 | | Date of Issue | 2015-12-31 | | Date of Implementation | 2017-01-01 | | Regulation (derived from) | State Standard Announcement 2015 No.43 | | 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 | GB/T 32364-2015: Plastics -- Phenolic resins -- Determination of pH---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Plastics - Phenolic resins - Determination of pH
ICS 83.080.01
G32
National Standards of People's Republic of China
Plastics - Determination of phenolic resin pH value
(ISO 8975. 1989, MOD)
Issued on. 2015-12-31
2017-01-01 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 8975. 1989 "Plastics - Determination of phenolic resin pH values."
This standard and ISO 8975. 1989 technical differences exist compared to the terms of these differences has been involved through its outer margin bits
Opposing vertical single line (|) were marked.
This standard and ISO 8975. 1989 and the technical differences for the following reasons.
--- Adds a note in Appendix A.1 Scope, "Note. This method is also suitable for measuring viscosity greater than 2Pa · s liquid phenolic resin
fat. "Modify because. Appendix A to the user a clearer method is applicable to more than 2Pa · s viscosity liquid phenolic resin.
--- In Appendix A "informative annex" to "normative appendix" Appendix A suitable viscosity greater than 2Pa · s liquid phenolic resin,
It should be a standard requirement of the content.
--- 4.2.3 adds composite electrode modification due to. the need for instrumentation technology development.
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee plastic thermosetting plastics Technical Committee (SAC/TC15/SC11) centralized.
This standard is drafted by. Shaxian Hongsheng Plastic Co., Chenguang Chemical Research Institute Co., Ltd., Changshu Southeast plastic
Ltd., Shanghai European-Asian Synthetic Material Co., Ltd., Shandong Shengquan Chemical Co., Ltd., a synthetic resin National Quality Supervision and Inspection Center.
The main drafters of this standard. Chen Yingui, Chen Jiwei, Wangyong Gui, Huaru Fang, Zhu Yongmao, Zhang Zhimin, Li Wenqiang.
Plastics - Determination of phenolic resin pH value
1 Scope
This standard specifies the method for measuring the pH of liquid phenolic resin.
Note. Appendix A provides another method for testing solid phenolic resin used. For liquid phenolic resin viscosity should be greater than 2Pa · s in Appendix A
Methods.
Principle 2
Immersed in the same solution utilizing the glass electrode and the reference potential difference between the electrodes to measure pH value ratio.
3 Reagents
During the analysis, use only recognized analytical reagent, distilled water or water of equivalent purity.
Having an acidic pH of about 4, neutral or alkaline pH value of about 7 standard pH of the solution is about 9, or a buffer solution.
Specified below standard solution or a buffer solution.
3.1 potassium hydrogen phthalate standard solution
Concentration c (KCOOC6H4COOH) solution of 0.05mol L /, at a pH of 4.00 when 23 ℃.
The pre-heating the dried 2h potassium hydrogen phthalate at 100 ℃ ~ 130 ℃ 10.21g dissolved in water and diluted to 1000mL.
The solution should be stored in a glass container, and avoid any trace of acid or base. The solution was to place longer, add a small amount of thymol crystals
body. Slightly turbid solution indicate microbial contamination, thymol failure, this solution should be discarded.
Hydrogen phosphate buffer solution 3.2
Per liter containing about 0.025mol potassium dihydrogen phosphate (KH2PO4) and 0.025mol disodium hydrogen phosphate (Na2HPO4) solution in 23 ℃
a pH of 6.88.
The pre-heat drying 2h 3.39g potassium dihydrogen phosphate and disodium hydrogen phosphate in 110 ℃ ~ 130 ℃ 3.53g dissolved in water, diluted
To 1000mL. The solution was to place longer, add a small amount of thymol crystals.
3.3 sodium tetraborate (borax) standard solution
Concentration c (Na2B4O7 · 10H2O) as a solution 0.01mol L/at 23 ℃ at pH 9.22. Tetraborate decahydrate dissolved 3.80g
Sodium compound in water, diluted to 1000mL.
4 Instrument
4.1 pH meter, accurate to 0.1pH units.
4.2 Electrode
Glass electrode. 4.2.1 measuring electrode.
4.2.2 The ratio of the reference electrode. calomel electrode.
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