HG/T 2905-1997 Determination of electrical conductivity of phenolic resin extract HG/T2905-1997 standard download decompression password: www.bzxz.net

HG/T2905--1997
This standard is equivalent to the international standard ISO9944:1990 "Plastic phenolic resin This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. Determination of the conductivity of resin extract".
This standard is under the jurisdiction of the Plastic Resin Products Branch (SC4) of the National Plastic Standardization Technical Committee (TC15). The drafting units of this standard are: Chenguang Chemical Research Institute (Chengdu) of the Ministry of Chemical Industry, Shanghai Plastic Factory. The main drafters of this standard are: Wang Jiandong, Ma Susu, Wang Yang, Shen Lingling. 649
HG/T2905-1997
ISO Foreword
ISO (International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of formulating international standards is carried out by ISO technical committees. Member groups interested in the disciplines for which technical committees have been established have the right to send representatives to participate in the technical committees. Governmental and non-governmental international organizations can also participate in this work after contacting ISO. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft international standards adopted by the technical committee are circulated to the member bodies for voting. They can only be published as international standards if at least 75% of the member bodies vote in favor.
International Standard ISO 9944 was prepared by ISO/TC61 Technical Committee Plastics. 650
1 Scope
Chemical Industry Standard of the People's Republic of China
Determination of electrical conductivity of resin extracts
Plasticsphenolic resinsdetermination ofelectrical conductivity of resin extractsThis standard specifies the method for the determination of the electrical conductivity of phenolic resin extracts at 23°C±2°C. This method is important for the application of phenolic resins as impregnation materials. 2 Principle
HG/T 29051997
idt1S0 9944:1990
Add acetone-water mixture to resin solution, let the resulting precipitate settle, measure the conductivity of the suspension remaining on the resin, and then calculate the conductivity from the measured conductivity.
3 ReagentsWww.bzxZ.net
3.1 Acetone: reagent grade.
3.2 Water: deionized water. Conductivity less than or equal to 2.0μS/cm. 3.3 Acetone-deionized water mixture: containing 8 parts by volume of acetone (3.1) and 4 parts by volume of deionized water (3.2). 4 Instruments
4.1 Electrode: the electrode constant K is known.
4.2 Conductivity meter: capable of measuring conductivity to a minimum reading of 1μS at 50Hz with an accuracy of 5%. 4.3 Beaker: nominal capacity 250mL.
4.4 Electromagnetic stirrer.
4.5 Balance: sensitivity 1mg.
5 Operation steps
5.1 Sample preparation
For resin solution, weigh 10g±0.05g solution and place it in a 250mL beaker (4.3). For powdered solid resin, take 8g resin and dissolve it in acetone (3.1) at a mass ratio of 1:1, weigh 10g±0.05g of the obtained resin solution and place it in a 250mL beaker (4.3).
5.2 Determination
Add 10g acetone (3.1) to the sample prepared in 5.1, and stir the mixture with an electromagnetic stirrer (4.4) until the liquid is uniform. Under strong stirring, add 100 mL of acetone-deionized water mixture (3.3) dropwise. Control the dropping speed so that the resin does not condense and begins to form an emulsion. When all the acetone-deionized water mixture has been added, continue stirring for 3 minutes and then clarify for 3 minutes. Pour the suspension above the resin into the beaker (4.3), and heat the suspension to 23℃±2℃. Measure the conductivity of the suspension with a conductivity meter, but do not exceed 3 minutes. 5.3 Alternative methods
In special cases, the following method can be used: Approved by the Ministry of Chemical Industry of the People's Republic of China on May 23, 1997, and implemented on October 1, 1997
G/T 2905-1997
Place 8.0 g of the resin in a 100 mL polyethylene container, add 80 mL of deionized water (3.2), and extract in a 95℃ oven for 20 hours. Cool the sample to 23℃±2℃ and then measure the conductivity (see 5.2). 5.4 Blank test
Under the same conditions, use the same amount of reagent glucose without adding resin to carry out a blank test. 6 Result expression
6.1 Calculation
The conductivity of phenolic resin solution is given by formula (1): r=K(GG.)
Where: r—
-Conductivity of phenolic resin solution, us/cm; K-electrode constant/cm
G—Conductivity of blank test S
G. Conductivity of suspension, uS.
The result is accurate to one decimal place.
6.2 Precision
Repeatability (same operator, same set of equipment): 10%. Reproducibility (one operator, several sets of equipment): 10%7Test report
The test report should include the following items:
a) Indicate the reference to this industry standard,
b) The type, identification and production date of the phenolic resin tested;c) Sampling date:
) The conductivity of the phenolic resin solution, as well as the conductivity of the phenolic resin suspension and blank sample solution,e) Agreed or unagreed practices that deviate from the prescribed test sequence,1) Test date.
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