Modified polypropylene knitted fabric, disperse dyeing

There is no polar group on the macromolecular chain of polypropylene, and there is no group capable of binding with dye molecules, and the crystallinity is high, the melting point and softening point are low, the dyeability is poor, and it is difficult to dye, generally in the spinning process. The original liquid is colored. The modified polypropylene is a modified fiber obtained by mixing a polypropylene resin with a certain amount of a metal organic compound and then melt spinning. The modified polypropylene can be dyed with a disperse dye that forms a complex with the metal to form a fiber-metal-dye combination. Such disperse dyes, also known as disperse mordant dyes, have both the basic properties of disperse dyes and stable complexes with certain metal ions, which are used to modify the dyeing of polypropylene to obtain a deeper color. Another modified polypropylene is a blend of 12% polyester resin and 88% polypropylene resin, and the polyester with dyeing properties is introduced into the polypropylene to improve the dyeing performance of the polypropylene. The fiber has a high shrinkage rate due to boiling water, so the dyeing temperature should not be too high. It is best to dye at normal temperature and pressure (100 ° C), and because of the low proportion of polyester, it is suitable for dyeing light and medium colors, and it is not suitable for dyeing deep dark colors. When dyeing, low-temperature disperse dyes should be used. The formulation and process of dyeing the polypropylene with the polyester blended with the disperse dye can be referred to the dyeing of the disperse dye nylon knitted fabric.

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