HG 3026-1987 Determination of ash content of unplasticized cellulose acetate HG3026-1987 standard download decompression password: www.bzxz.net

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Determination of ash-Unplasticized cellulose acetate
Piastics-Determlnation of ash-Unplasticized cellulose acetate UDC 678. 544. 4
GB 8328--87
IsO 3451/ 3 .. 198 4
This standard adopts the international standard ISO3451/3-1984 Plastics-Determination of ash content.
"Scope of application
3026-1P87
Part 3: Unplasticized cellulose acetate
1. 1 This standard specifies the method for determining the ash content of unplasticized cellulose acetate. The ash is the inorganic matter in cellulose. 1.2 This standard is not applicable to unplasticized cellulose acetate, which does not contain additives, fillers, dyes or other substances that affect the determination. 1.3 When there are plasticizers, additives or dyes that may affect the determination, they should be separated by a method agreed upon by both parties. 1.4 At a temperature of 575±25, it is suitable for determining the ash content of inorganic salts and inorganic impurities in cellulose acetate. The ash value obtained varies with the burning temperature. When the temperature is high (such as 850℃), calcium carbonate and other carbonates will be converted into oxides, thereby reducing the ash value... The composition of the ash also changes with the process used in the manufacturing process. Strictly speaking, the significance of the ash determination is limited. 2 Reference standard
GB 7132 "Determination of water content of unplasticized cellulose acetate". 3 Principle
A certain amount of sample is burned out, and according to the agreement of the relevant parties, it is directly burned in a muffle furnace at a constant temperature of 575±25℃ or 850±50℃, and the ash content is calculated based on the weighing result. 4 Apparatus
4.1 Crucible: quartz, porcelain or platinum crucible with a volume between 50 and 200 ml. 4.2 Bunsen burner with porcelain tripod and tripod, or other suitable heating device. 4.3 Muffle furnace: constant temperature controlled at 575 ± 25°C or 850 ± 50°C. 4.4 Analysis time, accurate to 0.1 mg.
4.5 Desiccant: filled with desiccant, such as anhydrous calcium. 4.6 Weighing bottle.
5 Procedure
5.1 Place the pile (4.1) in a muffle furnace (4.3) at 575 ± 25°C or 850 ± 50°C and heat until constant weight is reached. Then place it in the desiccator (4.5) for at least 1 hour, allow it to cool to room temperature, and then weigh it to 0.1 mg. 5.2 Weigh a sample (usually 10 ~~25g) equivalent to 5~50mg ash in the weighed weighing bottle (4.6) and weigh to the nearest 0.1mg. The sample is pre-dried according to the method specified in GB7132 or its water content is known. The Ministry of Chemical Industry of the People's Republic of China approved the GB8328-87 method on November 15, 1987 and implemented on August 1, 1988. If the weighing bottle can accommodate a sample equivalent to 50mg, it can be directly placed in the weighing bottle. If the sample is very loose, it can be weighed or cut into pieces of appropriate size. 5.3 Take the sample from the weighing bottle and fill it into a half crucible. The crucible is directly heated in the heater 1: to make the sample burn slowly to avoid the loss of ash. After cooling to room temperature, add another part of the sample. Repeat the above operation until all the sample is used up. 5.4 Place the crucible in a muffle furnace preheated to 575±25℃ or 850±50℃ and burn for 30 minutes. 5.5 Take the crucible out of the muffle furnace and place it in a desiccator for 1 hour to cool to room temperature, then weigh it to 0.1mg. 5.6 Burn it for another 30 minutes under the same conditions until constant weight is reached (that is, the difference between two consecutive weighing results is not greater than 0.5m). 6 Number of measurements
Carry out two measurements and calculate the arithmetic mean of the results. If the difference between the two experimental results exceeds 10% of their mean, repeat the above steps until the difference between two consecutive measured values ​​is not greater than 10% of the mean. 7 Expression of results The ash content is expressed in grams per 100 grams of cellulose acetate. The formula is as follows: Ash content = % ash × 100 + 1.0 = mass of cellulose acetate (which can be calculated by the actual mass of the sample and the moisture content of the sample measured according to ISO 7132). 8 Test report The test report should include the following contents: Note In accordance with this standard;
Complete identification of the inspected product (including model, manufacturer's batch number, source, trade name, etc.)9
Ignition temperature;
Pre-test sample treatment:
Two determinations of ash content and their average value. Additional remarks:
This standard is under the jurisdiction of the Chemical Method Branch of the National Plastic Standardization Technical Committee. This standard was drafted by the Wuxi Chemical Research and Design Institute of Jiangsu Province. The main authors of this standard are Zou Dexiang and Xu Huiyu.
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