HG/T 2711-1995 Routine determination of non-volatile matter in liquid phenolic resin HG/T2711-1995 standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
Routine determination of non-volatile matter in liquid phenolic resin HG/T2711-95
ISO 8618—1987
This standard is equivalent to the international standard IS0 8618—1987 "Routine determination of non-volatile matter in liquid phenolic resin for plastics" 1 Subject content and applicable scope
This standard specifies the routine determination method of non-volatile matter in liquid phenolic resin (resole phenolic resin, linear phenolic resin solution, etc.). It is used for commercial products or resins at various stages of the production process. Note: For phenolic resins, "non-volatile matter" is based on the test specimens of the arbitration (see Note 1 in 4.2). The results obtained by this method may be inconsistent with the test results obtained in the industrial application of the resin.
2 Definitions
This standard uses the following definitions:
Non-volatile matter: The percentage of residue obtained after the volatile matter of a certain mass of liquid phenolic resin evaporates under the conditions of specified temperature and time,
3 Apparatus
3.1 Small, easy-to-handle aluminum pan, nickel pan, stainless steel pan, tinplate pan or galvanized iron pan, flat bottom, inner diameter 75mm, height about 25mm.
Note: If the mass of the test resin is calculated according to the following formula (in grams), pans of different diameters can be used. m
Where: A—volume of the bottom of the pan, mm
3.2 Precision balance: Magnetic mass 1mg
# 0. 000 068 g / mm
3.3: A static convection oven with natural exhaust. A porous metal partition is placed at one-third of the oven height to control the test temperature (see 4.2).
3.4 ​​Dryer: Contains anhydrous calcium chloride or other suitable desiccant. 4 Operating steps
4.1 Clean the small dish and place it in an oven maintained at 135°C (or the selected test temperature) (see 4.2) to dry. Store in a dryer before use.
Weigh the mass of the clean, dry small dish (m.) (accurate to 1 mg). Add 3.0±0.5g of completely uniform resin into the dish and record the mass of the resin sample (m) (accurate to 1 mg) (see 3. 1 Note). 4.2 Place the pan in the center of the oven plate and heat to the preferred test temperature of 135 ± 1 °C. Other test temperatures may also be used (see Note 1), but should be noted in the test report. Other recommended temperatures are 120 ± 1 °C and 150 ± 1 °C (see Note 2 and Appendix). Note: ① The test temperature must be such that the volatiles evaporate without decomposing the resin. When selecting the temperature, the possible reactions and number of individual components should also be considered. ② 150 It is tested. Slightly different operating procedures can be used (dissolving the resin into a solution). See Appendix. Approved by the Ministry of Chemical Industry of the People's Republic of China on May 5, 1995 and implemented on January 1, 1996
HG /T 2711 - 95
4.3 After keeping at the selected temperature for 1h±5min, take out the small plate from the oven, cool it in the dryer for at least 1h, and weigh the non-volatile mass (mz) of the plate and the resin (accurate to 1mg). 4.4 Simultaneous parallel determination
Note: If the temperature of different parts of the sugar is inconsistent during the test, the two small plates should be replaced and placed at the same height in the oven. 5 Result expression
5.1 Calculate the non-volatile (NV) content according to formula (1) and express it in mass percentage: NV.
Where: mg
mass of the pan, g;
mass of the resin test partner, gi
-mass of the pan and the non-volatile matter of the resin sample, gm
-test temperature,
5.2 Calculate the arithmetic mean of the two measurements (to one decimal place). If the difference between the two test results is greater than 5% of the average value, the test should be repeated.
6 Test report
The test report should contain the following contents:
Indicate the reference to this industry standard;
Full identification of the test tree:
Type of test pan;bZxz.net
Test temperature;
If necessary, the solvent used (see Appendix for test at 150°C); Individual test results and their arithmetic mean, HG/T 2711 -95
Appendix A
Specific operating steps for 150℃ test
(supplement)
Warning: If a non-explosion-proof oven is used, when using solvents for non-volatile matter determination at 150±1, no more than two small pans should be used. If more than two are used, it will cause combustion and explosion. A.1 Solvent
A.1.1 Distilled toluene;
A,1.2 Isopropyl alcohol;
A.1.3 Methyl ethyl ketone.
A.2 Operation steps
Pre-dry the plate in an oven at 150°C, cool to room temperature and store in a desiccator. Weigh the mass of the clean, dry small plate [mn] (accurate to 1 g). Place enough resin in the plate to produce 0.5±0.05g of non-volatile matter. Record the mass of the resin sample in the plate (m,) (accurate to 1 mg). Dissolve the resin in 5mL of distilled toluene or isopropanol. If the resin is not soluble in such solvents, use methyl ethyl ketone. Note: Methyl ethyl ketone cannot be used for resol phenolic resin. The dissolution process can be accelerated by briefly heating in an oven (10-15s). When the resin is dissolved and evenly distributed on the bottom of the plate, place the plate in the oven, keep it horizontal, and heat it at 150°C for 2h. Remove the small plate from the oven and cool it to room temperature in a desiccator. Determine the non-volatile mass (m,) of the plate and the resin sample (accurate to 1 mg), and continue according to 4.4.
Additional notes:
This standard was proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Chemical Method Branch of the National Technical Committee for Plastics Standardization. This standard was drafted by Shanghai New Building Materials Factory No. 3, and the main drafters of this standard were Wang Zurui and Shen Yingchun.
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