Design And Development Of Hygroscopic Exothermic Ribbon

Functional ribbon is becoming a hot spot in the development of the ribbon industry.Among them,heating ribbon has developed rapidly in recent years,and products such as light energy heating ribbon and electric heating ribbon have also appeared on the market.The hygroscopic exothermic material is a positive heat-generating material with excellent performance.It can absorb water vapor in the environment and convert the kinetic energy of water molecules into heat.It has a good development prospect in the textile field,but the application and research of this material in ribbon products are seldom at present.Based on the background above,the purpose of this paper is to design and develop a hygroscopic exothermic ribbon with excellent comprehensive performance,in order to provide theoretical basis and reference ideas for products such as wrist guards,elbow pads,knee pads or heating abdominal belts.In this paper,three kinds of hygroscopic exothermic yarns which are commonly found on the market are used as the main raw materials.And 18 different elastic woven double-layer ribbons are woven by rationally designing different weave structures and warp and weft yarn configurations.Then,the thermal and wet comfort and heat preservation of the ribbons were tested and analyzed.Finally,the comprehensive performance evaluation and comparative analysis of each ribbon was carried out by using the fuzzy mathematics comprehensive evaluation method.Specific work contents are as follows:The three hygroscopic exothermic yarns used in this paper are 80%viscose/20%modified crylic~1（Y-1）,60%viscose/40%modified crylic~2（Y-2）and 40%viscose/60%modified Acrylic~3（Y-3）.And they are modified by different process technology.In order to deeply analyze the basic performance and heating mechanism of different hygroscopic and heating yarns,the three yarns were tested by SEM,FTIR,moisture regain,strength,evenness and hairiness respectively.The results show that there are many longitudinal grooves with different lengths and depths on the surface of Y-1 yarn,and the number of fiber grooves of Y-3 yarn is the least and its surface is most uniform and smoothest;All three yarns contain polar hydrophilic groups such as–NH₂,-OH and-COOH,but Y-1 yarn has the highest fiber surface roughness and complexity,these factors make Y-1 yarn have the highest moisture regain（17.34%）,1.86 times that of Y-2 yarn and 2.96 times that of Y-3 yarn respectively;In addition,because the original macromolecular structure of acrylic fiber is most damaged in Y-1 yarn,its breaking strength and elongation at break are the lowest,and the test results of Y-2 and Y-3 yarns are close.The evenness and hairiness values of the three yarns increased sequentially and the Y-2 yarn and Y-3 yarn were not significantly different in the two indexes.By the twisting process,the above three single yarns are respectively processed into double-ply yarns（Y-1^#,Y-2^#and Y-3^#）,and together with the elastic yarns,they are used as the raw materials of the warp yarns,and three kinds of single yarns（Y-1,Y-2and Y-3）and 300D polyester DTY are used as the raw materials of the weft yarn.3/1twill,4/2 twill and 6/2 twill weave were used to weave 18 different ribbons with different tissue structures and yarn configurations,and their air permeability,moisture permeability,thermal resistance,moisture absorption and heating properties were tested and compared.The results show that all the 18 kinds of ribbons show good moisture absorption and heat generation performance,the highest temperature rise value is more than 10℃,and the average temperature rise value is more than 5℃,which complies with the moisture absorption and heating index specified in GB/T 29866-2013.Among them,6/2 twill weave has the largest yarn content per unit area,and can absorb and adhere the most water molecules,so the heating effect is the best,4/2 twill weave is the second,and 3/1 twill weave is the worst;The influence of different warp yarns on the hygroscopic exothermic effect of the ribbon is as follows:Y-1^#>Y-2^#>Y-3^#.This is because the Y-1^#warp yarn has the highest moisture regain which can absorb more water per unit time,and generate the most heat;Compared with 300D polyester DTY,the ribbon showed better hygroscopic exothermic performance when three kinds of hygroscopic exothermic single yarns were used as weft yarns.The comprehensive performance evaluation of 18 kinds of webbing was carried out using the fuzzy mathematics comprehensive evaluation method.Using the range normalization and dispersion maximization method,the air permeability,moisture permeability,thermal resistance value,the highest temperature rise value and the average temperature rise value within 30min to the comprehensive performance weight of the ribbon are 0.2081,0.2067,0.1926,0.1918,0.2081 and 0.2008 respectively.It shows that under this method,the weights of the five indicators on the overall comprehensive performance of the ribbon are relatively close.Among all the ribbons,the ribbon with the highest comprehensive evaluation value uses 6/2 twill weave,Y-1^#warp yarn and Y-1weft yarn,and it has the best comprehensive performance and good development value.