Method for increasing dyeing depth of para-aramid fibers and fabrics

Abstract

The invention discloses a method for increasing the dyeing depth of para-aramid fibers and fabrics. A mechanical method is utilized to pretreat para-aramid, so that the fiber surfaces of the para-aramid are roughened, or regulated by a processing process, the internal structures of fibers are improved, so that the surface density of the fibers is decreased, and thereby a fibrillated or air hole-like structure is formed; after pretreatment agent is applied to carry out surface deoiling treatment on the treated para-aramid, screened dye is adopted, a high-temperature and high-pressure dyeing process is adopted, a dyeing auxiliary which is prepared from dyeing carrier, surfactant, electrolyte and the like is added in the process of dyeing to dye the para-aramid 1414 fibers and fabric, and after flood removal, washing and drying, required color and dyeing depth can be achieved. When the dyeing method disclosed by the invention is applied to dye para-aramid 1414 fibers and fabric, the degree of dyeing reaches more than 80 percent, the color depth value K / S can reach more than 16, the color fastness to rubbing of dyeing reaches level 3-4, and the color fastness to staining reaches level 4-5. After the process of dyeing the para-aramid 1414 fibers and fabric, the strength drop is less than 15 percent.

Description

technical field [0001] The invention relates to the field of dyeing of synthetic fiber materials, in particular to a para-aramid fiber dyeing method. Background technique [0002] Para-aramid fiber is poly-p-phenylene terephthalamide fiber (PPTA), which is one of the main varieties of aromatic polyamide fiber. Due to its comprehensive performance, it is widely used in protection, aerospace, high-strength ropes, high-temperature filtration, composite materials and other fields. With the continuous expansion of production capacity, more and more para-aramid fibers are used in protective clothing, gloves, sporting goods and other products, including high-temperature protective clothing, firefighting clothing, military uniforms, racing suits, space suits, etc. In addition to high-strength, flame-retardant, and temperature-resistant protective functions, clothing and gloves also need to meet the needs of warning, beauty, and easy identification through color. Therefore, there is...

AI Technical Summary

Problems solved by technology

According to the reported para-aramid dyeing technology, the fiber is generally pretreated by acid / alkali, and part of the method is to add a carrier and dye it through high temperature and high pressure. The dyeing temperature is as high as 160-180 ° C. The existing dyeing and finishing equipment cannot Realized, so the existing technology is still basically in the laboratory stage, and has not realized the application of industrialization, and the para-aramid fiber and fabric dyeing, the color of the dyed product is relatively light, and the darker color cannot be obtained, and the phenomenon of color flower is prone to appear , the color depth and color fastness are not enough, and there is no mention of whether the dyeing technology will corrode the dyeing and finishing equipment and cause environmental hazards