GB/T 4617-1984 Determination of acetone soluble matter in phenolic moldings

This standard specifies the gravimetric method for determining the amount of extractable matter from a ground phenolic moulding product specimen using acetone near its boiling point. This standard is equivalent to ISO 59-1976 "Plastics - Phenolic moulding products - Determination of acetone soluble matter". The acetone soluble matter test is a method for determining the relative degree of cure of phenolic moulding products made from phenolic moulding materials. The extraction process should be carried out under specified conditions and within a specified time. Although most of the soluble matter is determined, the extraction is not necessarily complete and the result is only a comparative result because the extract often contains substances other than uncured resin (such as lubricants, colorants and plasticizers). GB/T 4617-1984 Determination of acetone soluble matter of phenolic moulding products GB/T4617-1984 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Determination of acetone-soluble matter in phenolic mouldingsPhenolic mouldings-Determinationof acetone-soluble matter
UDC 678.632
GB4617--84
This standard specifies the gravimetric method for determining the amount of extractable matter from a ground phenolic moulding sample using acetone near its boiling point. This standard is equivalent to ISO59-1976 "Scope of Application of Plastic Phenolic Mouldings
-Determination of Acetone Soluble Matter"
The acetone soluble matter test is a method for determining the relative degree of solidification of phenolic mouldings made of phenolic moulding materials. The extraction process should be carried out under specified conditions and within a specified time. Although most of the soluble matter is determined, the extraction action is not necessarily complete and the result is only a comparative result because the extract often contains substances other than uncured resin (such as lubricants, colorants and plasticizers). 2
Heat and extract the acetone solubles in the powdered sample, evaporate the acetone, dry the extract to constant weight, and weigh the dried extract. 3 Reagents
3.1 Acetone, analytical grade.
3.2 Glycerol.
4 Apparatus
4.1 Equipment for powdering the molded product. 4.2 Standard sieve, 425μm (40 mesh/inch), 250um (60 mesh/inch). 4.3 Balance, graduation value 0.001g.
4.4 Extractor, as shown in the figure (silk bag can be used instead of single-layer extraction sleeve) 4.5 Oven, electric heating blast type, controllable at 50±2℃. Issued by the State Bureau of Standards on July 80, 1984
Implemented on May 1, 1985
Sample Preparation
GB4617—84
Powder a fully representative molded product by drilling, filing or planing. Do not overheat the material during sample preparation to prevent the powdered sample from absorbing moisture. Use a standard sieve to screen the sample for extraction test. Steps
6.1 Take two samples at random (see Chapter 5). 6.2 Weigh about 3g of the sample, accurate to 0.001g, and put it into a silk bag (electric spinning) that has been dried at 105℃. 6.3 To prevent the molded material from escaping, tie the silk bag containing the sample tightly and put it into the siphon cup of the extractor. Assemble the snake condenser, siphon cup and flask with 50ml of acetone added. 6.4 Adjust the heating to make the siphoning speed 20 to 30 times per hour, and extract continuously for 6 hours. Cool and remove the flask. Pour the contents of the flask into a conical flask that has been dried to constant weight at 50°C and accurately weighed to 0.001g, wash the empty flask with about 20ml of acetone, and add the washing liquid to the extract.
6.5 Install a condenser on the conical flask in a water bath, control the water bath temperature to 60 to 65°C, and evaporate most of the acetone. Then, take out the conical flask containing a small amount of acetone residue, put it in an oven to control the temperature to 50±2°C, dry it for 30 minutes, place it in a desiccator to cool to room temperature and weigh it. Repeat heating, cooling and weighing until constant weight is reached, that is, until the error does not exceed 0.003g after two consecutive weighings. 1
Results
The content of acetone soluble matter X (%) is calculated as follows: m2×100
Wherein: mo--bzxZ.net
-mass of sample, g,
-mass of dry extract, g.
GB 4617-B4
The arithmetic mean of the values ​​obtained from two tests is taken as the content of acetone soluble matter in the tested molded product. Test report
The test report should include the following items:
Complete identification of the sample,
The method used to make the molded product into powder, the content of acetone soluble matter in each sample; the arithmetic mean of the values ​​obtained from two samples, and the test date.
Additional remarks:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China and is under the jurisdiction of the Chemical Method Sub-Technical Committee of the National Technical Committee for Plastics Standardization.
This standard was drafted by Shanghai Plastic Factory. The main drafters of this standard are Yin Yichu and Shen Fengshu.
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