The silk is light and comfortable, which not only nourishes the skin, but also helps sleep.
To identify the true and false silk, in addition to observing the appearance, 84 disinfectant can also verify the authenticity.
The appearance of high-quality silk has a pearl-like color, diffuse refraction of light, cleanliness and impurities, and the silk path is orderly and tidy. The poor quality of the silk is pale due to the addition of chemicals such as bleach. It is not shiny and moist, and has a lot of impurities.
The electrostatic reaction is used to rub the silk at the sample mouth. When it is for one minute, let it absorb the shredded paper of the size of the rice. If it can be sucked up, it means that a large amount of chemical fiber is mixed, and the pure silk is not generated by static electricity.
Natural silk is not flammable
The burning natural silk does not have flame retardancy. When it is separated from the flame, it will stop burning (Fig.), and the ash is loose and grayish white, which has the smell of hair burnt; the fake silk is black when it is ignited by fire, with stimulation. Sexual smell.
The amino acid in the dissolved silk is a soluble protein, and a little silkworm is in the 84 disinfectant. After three or five minutes, the silk will gradually dissolve and disappear (Fig.), and if it does not fall, it is a fake silk.
Basic organic chemical raw materials:Calcium cyanamide, Dicyandiamide, Guanidine nitrate etc.
It is used for the manufacture of guanidine nitrate and sulfonamides in medicine. It is also used to produce thiourea, nitrocellulose stabilizer, rubber vulcanization accelerator, steel surface hardening agent, artificial leather filler, Adhesive and so on. The drug intermediate 5- aza cytosine can be obtained by the reaction of dicyandiamide with formic acid.As a raw material for guanidine and cyanogen two amines.
Organic Chemical Material,Dicyandiamide For Organic Chemical Material,Dcda For Organic Chemical Material,Superfine Dcda For Organic Chemical Material
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