In engineering practice, how can we identify good and bad?
1. PVC jacket: The surface can see the regular "unevenness" of the netting inside the net, which means that the processing technology is good and no relative slipping will occur. It is a good cable. The appearance is smooth, can't see the "unevenness" of the compacted net, and the looseness of the sheath is caused by hand, which is a poor cable;
2, check the shielding layer mesh: whether the number is enough? Copper wire mesh, check the solderability, tinned copper computer wire scraping to see if it is copper wire, aluminum-magnesium alloy wire hardness is significantly greater than the copper wire; network sparse , uneven distribution, and the insulation layer is not tight, such as poor cable;
3, check the core: diameter - SYV cable is 0.78-0.8mm, SYWV cable is 1.0mm; recently appeared a SYV75-5 core diameter is 1.0mm cable, the characteristic impedance of this cable, certainly not 75 Ohm, not applied to 75 ohm transmission systems;
4. Check the binding force between the core wire and the insulating layer: Cut the insulation layer obliquely, pull the core wire in the direction of peeling, and see if the core wire and the insulation layer are covered with the process material; good cable has a large binding force, poor The cable is not covered;
5. Longitudinal tensile test: Take one meter cable, peel the core wire, insulation layer, shielding layer, and outer cover in layers, leaving 10 cm long. The method is: Two hands hold the adjacent two layers of the cable and pull in the opposite direction; the cable is generally unable to pull the power, so the cable can be easily pulled out without any effort.
Dispersant Agent mainly for textile industry.
Mainly used to coloring for vat dyes, reactive dyes, acid dyes, acid staining pad or pigment pad dyeing of the dispersing agent, as a auxiliaries for vat dyes's powder or sizing agent. Also used staining to levelling agent and auxiliary tanning agent in leather industry. Can also be used for textile printing and dyeing, pesticides as dispersing agent, papermaking, electroplating additives, latex, rubber, construction, water-soluble paint, pigment dispersant, oil drilling, water treatment agent, carbon black, printing ink dispersant.
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