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Determination method for content of carbon black

A technology of carbon black content and measurement method, which is applied in the direction of weighing by removing certain components, can solve the problems of poor repeatability and inaccurate measurement of carbon black content, and achieve the effect of high accuracy

Active Publication Date: 2014-03-19
成都菲斯特新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to our company's experiments, in the case of calcium carbonate fillers, especially in the case of high calcium carbonate fillers, the above-mentioned standards are basically inaccurate in measuring the carbon black content, and the repeatability is poor.

Method used

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  • Determination method for content of carbon black

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 The test method of carbon black content in calcium carbonate-containing plastic product A

[0035] This test method includes the following steps:

[0036] Step 1. Preparation stage: Check that the pressure of nitrogen and oxygen cylinders should be less than 1MPa to ensure no air leakage;

[0037] Porcelain boat should be heated to 550°C to remove its attached water and impurities, weigh the porcelain boat m (constant weight) at room temperature to be 12.7819g, and set aside; the sample (including CaCO 3 The black masterbatch (referred to as masterbatch) is baked at 95°C for 2 hours to remove the attached moisture of the sample, weigh the masterbatch m1=1.0021g at room temperature, and set aside; connect the test equipment.

[0038] Step 2. Use a carbon black content tester to perform pyrolysis and calcination tests on the masterbatch:

[0039] Place the porcelain boat with the masterbatch in the center of the quartz tube of the carbon black content tester...

Embodiment 2

[0056] Example 2 The test method of carbon black content in the calcium carbonate-containing plastic product B

[0057] In this example, the test sample gets the same black masterbatch containing calcium carbonate in Example 1, and its carbon black content is 30 ± 1%; the calcium carbonate content is about 30%.

[0058] The test steps are basically the same as in Example 1, the difference is:

[0059] Step 1. In the preparation stage: the porcelain boat m (constant weight) is 12.4312g, and the masterbatch m1 is 0.9981g;

[0060] Step 3. Weighing after the masterbatch is completely pyrolyzed: when the exhaust of the quartz tube does not make the lime water turbid, stop the tube electric furnace

[0061] Heating; when the temperature drops to 400°C, switch on and off the nitrogen gas, so that the masterbatch in the porcelain boat gradually drops to room temperature, and then weigh the weight of the porcelain boat with the pyrolyzed masterbatch m2 = 0.4670g;

[0062] Step 4. Ca...

Embodiment 3

[0065] Example 3 The test method of carbon black content in calcium carbonate-containing plastic products C

[0066] In this example, the test sample gets the same black masterbatch containing calcium carbonate in Example 1, and its carbon black content is 30 ± 1%; the calcium carbonate content is about 30%.

[0067] The test steps are basically the same as in Example 1, the difference is:

[0068] Step 1. In the preparation stage: the porcelain boat m (constant weight) is 11.2512g, and the masterbatch m1 is 1.0034g;

[0069] Step 2. Use a carbon black content tester to perform pyrolysis and calcination tests on the masterbatch:

[0070] Sample pyrolysis stage and pyrolysis standard: the ceramic boat placed in the quartz tube is heated to make the master material in the porcelain boat warm

[0071] The temperature is gradually increased, while heating, nitrogen is passed through the quartz tube, and the masterbatch is pyrolyzed in the nitrogen environment; the pyrolysis pro...

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Abstract

The invention belongs to the field of determination of the content of plastic products and particularly relates to a determination method for the content of carbon black. The determination method comprises the following steps: pre-treating and weighing a test sample and a porcelain boat-shaped disc; putting the test sample and the porcelain boat-shaped disc into a carbon black tester quartz tube; carrying out pyrolysis on the test sample under the environment of introducing nitrogen; after finishing the pyrolysis, cooling and cutting off the nitrogen; weighing the porcelain boat-shaped disc filled with the pyrolyzed test sample; putting the weighed porcelain boat-shape disc filled with the pyrolyzed test sample into the carbon black tester quartz tube; introducing oxygen and calcining; after calcining completely, turning off a machine and cutting off the oxygen; cooling; weighing at a room temperature; and calculating the content of the carbon black. Clarified lime water is used as a pyrolysis indication; if carbonate in the test sample is not completely decomposed, CO2 in a test is exhausted and air bubbles in the lime water become muddy. The pyrolysis is continually carried out until the lime water is not changed; when the lime water keeps clean, the carbonate is completely decomposed. The detection method is accurate and high in repeatability; the difficulty of determining the content of the carbon black in a plastic product containing the carbonate is successfully solved and the determination method is applicable to determining the content of the carbon black in plastic.

Description

technical field [0001] The invention belongs to the field of measuring the content of plastic products, in particular to a method for measuring the content of carbon black. [0002] Background technique [0003] Testing the carbon black content in black plastic products is required in the plastic processing industry at home and abroad. There is only "GB / 13021-91 Determination of Carbon Black Content in Polyethylene Pipes and Fittings" in China, and this method is also applicable to the determination of carbon black in polyolefin pipes and fittings. This standard follows ISO6964-1986 and is suitable for testing polyolefin products without fillers. The basic principle is to "pyrolyze a certain amount of sample at 550±50°C for about 45min in a nitrogen flow, and calcinate at 900±50°C. Calculate the carbon black content according to the mass difference before and after pyrolysis and calcination." This standard applies to testing polyolefin products without fillers. It is an ...

Claims

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Application Information

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IPC IPC(8): G01N5/04
Inventor 彭志远薛燕李小华
Owner 成都菲斯特新材料有限公司
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