Introduction Of CD Yarn

It is called cationic polyester yarn, which is called cationic polyester yarn in English, CD yarn for short, and is generally dyed with cationic dyes; compared with ordinary polyester yarn, ordinary polyester yarn is dyed with disperse dyes at high temperature and high pressure, while cationic polyester yarn It can be dyed with cationic dyes at normal temperature and pressure.

Cationic yarn belongs to modified polyester, chemical name: polybutylene terephthalate (elastic polyester), abbreviation: PBT, and it is also represented by CD in the factory. Because ordinary polyester (polyethylene terephthalate) has disadvantages such as low moisture absorption, poor dyeing performance, easy accumulation of static electricity, and easy fluffing, etc., it is usually modified with sulfonate as a modifier to be dyeable with cationic dyes. Modified polyester, or add cationic active agent before spinning or during the spinning process to prepare modified polyester. Such yarn is called cationic yarn. This yarn does not need to be dyed at high temperature (130-135°C) like ordinary polyester. It can be dyed.

Polyester fiber is a hydrophobic synthetic fiber that lacks functional groups that can combine with direct dyes, acid dyes, basic dyes, etc. Although it has an ester group that can form hydrogen bonds with disperse dyes, the polyester molecular chain structure is tight, and the dye molecules are not easy to enter the fiber, resulting in difficult dyeing and monotonous color, which directly affects the development of polyester fabrics.

Due to the high crystallinity of polyester, there are only small voids in the fiber. When the temperature is low, the thermal movement of molecules changes its position to a small extent. Under humid conditions, polyester fiber does not pass through violently like cotton fiber. Swelling increases the voids, making it difficult for dye molecules to penetrate into the fiber. When dyeing polyester, usually only disperse dyes can be used for dyeing, and it must be dyed under high temperature and pressure or with the help of a carrier.

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