Method for testing fluorine content in fluororubber
A test method and technology of fluorine content, applied in the field of fluorine rubber, can solve the problems of unsuitable for daily testing of fluorine rubber production enterprises and processing enterprises, high price, high requirements for instruments, and achieve low cost, low requirements for instruments and operations, and scientific design reasonable effect
Inactive Publication Date: 2020-05-05
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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Problems solved by technology
These three methods are only applicable to fluororesin coatings with a fluorine content below 35%, not applicable to fluororubbers with a fluorine content greater than 60%.
[0006] For the oxygen combustion-ion selective electrode method used in the fluororubber test, the requirements for the instrument are relatively high, and the price is relatively expensive, so it is not suitable for the daily detection of fluororubber manufacturers and processing enterprises.
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Embodiment 1
[0035] The fluororubber raw rubber samples 246D, 246, 246D, 246, Three grades of 246G were used as standard samples, and two batches were selected for each standard sample. It was known that the fluorine content was 66%, 68.5%, and 70% respectively. According to the following steps, they were made into fluororubber compounds.
[0036] The selected mixing formula is: 100 parts of fluorine rubber; 2 parts of vulcanizing agent bisphenol AF; 0.5 parts of accelerator BPP; 6 parts of acid absorbing agent calcium hydroxide, 3 parts of magnesium oxide; 30 parts of carbon black (N990).
[0037] The preparation method of fluororubber vulcanizate standard sample comprises the following steps:
[0038] (1) Mixing: Add fluorine rubber raw rubber samples, vulcanizing agent, accelerator, acid absorbing agent, and carbon black into the open mill for mixing. The mixing temperature is 60°C, and the mixing time is 30 minutes. film after pass;
[0039] (2) One-stage vulcanization: using a press...
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The invention relates to a method for testing fluorine content in fluororubber, and belongs to the technical field of fluororubber. The method comprises the following steps: (1) preparing a vulcanizedrubber standard sample from fluororubber with known different fluorine contents; (2) performing solvent resistance test on the vulcanized rubber standard sample, and drawing a linear relation curve between the fluorine content and the volume change rate according to the change result of the volume change rate of the vulcanized rubber standard sample along with the fluorine content; (3) mixing andmolding fluororubber to be tested according to the method in the step (1) to prepare a vulcanized rubber sheet; (4) performing a solvent resistance test on the vulcanized rubber sheet prepared in thestep (3), wherein the used solvent is the same as the solvent used in the step (2); and (5) substituting the measured volume change rate into the linear relation curve to obtain the fluorine contentin the fluororubber to be tested. The method is scientific and reasonable in design, low in instrument and operation requirements, low in cost, capable of testing a plurality of rubber samples at a time and high in efficiency.
Description
technical field [0001] The invention relates to a method for testing the fluorine content in fluororubber, belonging to the technical field of fluororubber. Background technique [0002] Fluorine rubber refers to a synthetic polymer elastomer that contains fluorine atoms on the carbon atoms of the main chain or side chain. The introduction of fluorine atoms endows fluororubber with excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance and atmospheric aging resistance, making it widely used in aerospace, science and technology, automobile, chemical industry, light industry, metallurgy, machinery, There are irreplaceable applications in sectors such as oil extraction. The fluorine content in fluororubber plays a vital role in the chemical stability, high and low temperature performance and service life of fluororubber. Therefore, it is very necessary to accurately and effectively test the fluorine content of fluororubber of. [0003] Patent C...
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Login to View More IPC IPC(8): G01N33/44
CPCG01N33/445
Inventor 岳广王军王汉利徐丽娟王梦琪
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL