Fiber of Elastic Composite Fabric
Quantitative Analysis of Fiber Composition Content of Elastic Composite Fabric
Composite fabrics are a new type of material which is made up of one or more layers of textile materials, non-woven materials and other functional materials by bonding and bonding.
Composite fabrics are made of “new synthetic fibers” with high technology and new materials.
It has many excellent properties, such as fine, delicate, elegant and warm fabrics.
The fabrics have plump appearance, wind-proof and air permeability with certain waterproof functions.
If polyester/spandex blended fabrics and other fabrics are used for compounding,
It can form a good, elastic, compact and soft fabric effect.
Most composite fabrics are processed with a certain amount of adhesives.
Moreover, it is difficult to remove the adhesives completely in the process of fiber composition quantification.
It has a great influence on the accuracy of fiber quantification.
Because it is difficult to remove the adhesives completely, the choice of different quantitative methods and dissolution order has a great influence on the quantitative results of the components.
In this paper, elastic composite fabrics containing polyurethane and polyester fibers in a certain proportion are selected.
The effects of different quantitative methods on the results of components were analyzed, and representative samples were selected for comparisons between laboratories, and the results of comparisons were briefly analyzed.
Brief Introduction to Standards for Quantitative Analysis of Components 2.1 Pretreatment Method Brief Introduction to National Standard GB/T 2910.1-2009 Quantitative Chemical Analysis of Textiles Part 1:
The “Introduction” part of the General Principles of Experiments stresses that:
In processed or finished fibre mixtures,
It may contain oils, waxes or finishing agents which may be carried by the fibers themselves.
It may also be added; salts and other water-soluble substances may also exist in the mixture; and
Textiles may also contain resins or other additives added to increase the cohesion of fibers or to give textiles waterproof, crease-resistant properties.
During the analysis, some or all of these substances may dissolve.
It is also calculated as the mass of soluble fiber components.
To avoid this error, these non-fibrotic substances should be removed before analysis.
Appendix A of standard GB/T 2910.1-2009 gives the pretreatment methods for removing oil, fat, wax and water-soluble substances.
2.2 Quantitative methods When the sample cannot be quantitatively analyzed by resolution method,
The main criteria for quantitative analysis of polyester fibers and polyurethane fibers are as follows:
FZ/T01095-2002 Test Method for Fiber Content of Textile Spandex Products, GB/T 2910.12-2009 Quantitative Chemical Analysis of Textiles Part 12:
Polyacrylonitrile fibers, some modified polyacrylonitrile fibers, some chlorine-containing fibers or some elastic fibers mixed with some other fibers (dimethylformamide method). and ATCC20A-2014 Fiber Analysis:
Quantitative analysis was carried out by 80% sulfuric acid method, dimethylformamide method and sodium hydroxide/methanol method, respectively.
The differences of three quantitative methods are briefly described.
(1) FZ/T01095-2002 put the prepared samples into a triangular flask containing 80% sulphuric acid solution at (24 +1)degrees Celsius.
Add 100ML test solution to each gram of sample and stir at least 10MIN to dissolve spandex.
The remaining fibers were filtered with a glass sand core crucible of known quality and washed three times with sulfuric acid of the same temperature and concentration.
Wash 4-5 times with distilled water at room temperature and 2 times with dilute ammonia.
Then wash until the indicator is neutral. After each wash, the liquid must be pumped by vacuum pump.
(2) GB/T 2910.12-2009 put the prepared sample into a triangular flask.
150 ML dimethylformamide was added to each gram of sample to plug the glass plug.
Shake the flask and wet the sample thoroughly. Keep the flask at 90 95 for 1H.
The residue is filtered by glass sand core crucible and left in flask with 60ML dimethylformamide.
Keep 30 MIN at 90 95 C and gently shake it twice with your hands.
The residue is filtered into a glass sand core crucible and drained by vacuum suction.
Wash the residue in crucible with water and vacuum suction drainage.
The hot water is filled with crucible and the residue is washed twice. After each gravity drainage, the residue is sucked by vacuum.
If insoluble fibers are polyamide fibers or polyester fibers, glass sand core crucibles and residues can be dried, cooled and weighed.
(3) AATCC20A-2014 accurately weighs 0.5G-1.5G clean, dry and ready samples and records their weight.
Accurate to 0.1MG.
The 18G reagent grade sodium hydroxide pellets were added to 250ML conical bottle containing 200 ML methanol.
Heating to 80 C and mixing well.
The sample is added to a sealed flask and stirred with a magnetic stirring rod.
After 5 MIN impregnation, the residue was separated from the undissolved residue.
Wash the residue with 70% isoacetone and filter out the insoluble matter with a crucible with known dry weight.
Then the crucible and the residue are dried naturally together and then transferred to the oven at 105 ~110 ~C for constant weight.
Finally, the weight of dry residue was recorded and accurately reached 0.1MG.
According to the above three standards, the quantitative dissolution method of polyester fibers for polyurethane and polyester composite fabrics is the dissolution of polyester fibers.
There are also specific differences in dissolved polyurethane fibers as shown in Table 1.
When the sample contains adhesives that can not be removed, the choice of different dissolution methods has a great impact on the accuracy of quantitative results of components.