Oil-seepage-proofing test method for PVC sheath material
A testing method and sheath material technology, applied in measuring devices, analyzing materials, and analyzing materials through optical means, can solve the problems of no detection method, limited plasticizer absorption, safety and quality accidents, etc., and achieve easy implementation, Judgment is intuitive and the effect of solving the problem of anti-seepage oil
Inactive Publication Date: 2017-11-10
FAR EAST CABLE +2
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Problems solved by technology
In the actual use of cables, the absorption of PVC to plasticizers is limited. If the content of epoxy soybean oil (ESO) is high, the absorption of PVC to plasticizers will be saturated and precipitated, and oil seepage will appear on the surface. Safety and quality accidents will bring losses. Therefore, if the preliminary inspection can be carried out when the raw materials are supplied, many accidents and losses will be avoided. However, there are no relevant inspection methods or inspection standards in the existing technologies and processes.
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Embodiment 1
[0023] The PVC sheath material anti-seepage oil test method of the present embodiment may further comprise the steps:
[0024] Step 1: Prepare test instruments and equipment: prepare double-roll mill, flat vulcanized tablet press and FTIR-650 Fourier transform infrared spectrometer;
[0025] Step 2: Sample preparation: Use an open mill and a tablet press to prepare test samples from H-90°C PVC pellets; weigh 250-300g of H-90°C PVC pellets, and use a double-roller open mill to knead and open The refining temperature is 155±5°C, and the refining time is 3-5 minutes; the refined samples are pressed with a flat vulcanized tablet press, the pressing temperature is 170±5°C, the pressing time is 6-8 minutes, and then cold pressed for 2 minutes -3min, the thickness of the tablet is 0.8-1.0mm; cut the pressed sample into 3 samples in the smooth area according to the size of 55*55mm, ±5mm, and mark them in order; put the prepared samples into the desiccator Storage, the storage time is...
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The invention discloses an oil-seepage-proofing test method for a PVC sheath material. The oil-seepage-proofing test method for the PVC sheath material comprises the following steps of preparing test equipment and devices; preparing samples, wherein an open mill and a tablet press are adopted to prepare test sample sheets from H-90 DEG C PVC granule materials; conducting a spectrum test on the sample sheets by using an FT-IR spectrometer, and obtaining a spectrogram; checking whether or not absorption peaks exist in the range of 1780-1680 cm<-1> in the spectrogram, if yes, checking specific locations of the absorption peaks, and conducting a comparison; determining whether or not the PVC sheath material can be accepted, if at least one absorption peak exists in the range of 1730-1710 cm<-1>, and determining that the rate of oil seepage is low, and the PVC sheath material is acceptable; if no, determining that the PVC sheath material is not acceptable. According to the oil-seepage-proofing test method for the PVC sheath material, it is creatively proposed that oil seepage pre-detection is conducted in a PVC raw material phase, PVC raw materials which cannot pass the pre-detection are directly judged as unacceptable raw materials and are not used in the subsequent production of the PVC sheath material, and therefore the problem of oil seepage is solved fundamentally.
Description
technical field [0001] The invention relates to a method for testing anti-seepage oil of PVC sheathing materials. Background technique [0002] PVC is polyvinyl chloride, which is a polymer formed by the polymerization of vinyl chloride monomer in peroxide, azo compound and other initiators, or according to the mechanism of free radical polymerization under the action of light and heat. Plastic, especially used in wire and cable, multi-seat cable sheathing material. PVC is a white powder with an amorphous structure, the degree of branching is small, the relative density is about 1.4, the glass transition temperature is 77-90°C, it begins to decompose at about 170°C, and it has poor stability to light and heat. When exposed to sunlight, it will decompose to produce hydrogen chloride, and further autocatalyze the decomposition, causing discoloration and rapid decline in physical and mechanical properties. Therefore, plasticizers are added to improve its performance. Commonly...
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IPC IPC(8): G01N21/3563
CPCG01N21/3563G01N2021/3595
Inventor 徐静蒋华娟蒋玉凤王亮
Owner FAR EAST CABLE