Polyamide fiber identification reagent, preparation method thereof and detection method by using the same

Abstract

The present invention relates to a polyamide fiber identification reagent, and a preparation method thereof and a detection method by using the same. The reagent is prepared from concentrated hydrochloric acid and water in the weight ratio of 36.45:63.55. The detection method is as below: taking a 5g sample containing the polyamide fabric and spandex fiber, placing the sample in a Soxhlet extractor, extracting with a petroleum ether for 1h, cycling for at least six times per hour, violating the petroleum ether in the sample, immersing the sample in cold water for 1h, then immersing the sample in water of 65 DEG C for 1h by the ratio of water to sample of 100:1, stirring the solution, then conducting suction or centrifugal dewatering, and drying; placing the sample in a stoppered triangular flask, adding 100ml of polyamide fiber identification reagent in each gram of the sample, fully dissolving the polyamide fiber, washing the remaining fibers with polyamide fiber identification reagent with the same concentration at the same temperature for 2-3 times, neutralizing with a dilute ammonia solution, and then washing by water until indicator detection shows a neutral state; and finally drying, cooling and weighing.

Description

technical field [0001] The invention relates to a nylon fiber identification reagent, a preparation method thereof, and a detection method using the same. Background technique [0002] Nylon and spandex fiber mixed clothing materials have high elasticity and excellent rebound performance, soft hand feeling, comfortable wearing, can show the beauty of the body, and are easy to absorb sweat and do not generate static electricity. This kind of fabric has been widely used in underwear to Outerwear and other clothing that need to be stretched, such as professional sportswear, fitness clothes, casual wear, bras, socks and other clothing. From knitted fabrics to woven fabrics, from garment fabrics to decorative fabrics and functional materials. In the prior art, there are three methods for quantitative detection of nylon and spandex fiber mixed clothing: 80% formic acid method, 20% hydrochloric acid method, and dimethylformamide method. The shortcomings of the three methods are th...

AI Technical Summary

Problems solved by technology

In the prior art, there are three methods for quantitative detection of nylon and spandex fiber mixed clothing: 80% formic acid method, 20% hydrochloric acid method, and dimethylformamide method. The shortcomings of the three methods are that due to the detection During the process, the weight loss of spandex fiber is relatively large, which makes the detection accuracy low