FZ/T&Nbsp; 01026 Comparison Of New And Old Standards
1 Introduction
mix
Spin
The content of each component is expressed as a percentage of the total mass of the mixture.
Generally, the dissolution method is used to select the appropriate reagent to dissolve one or several components of the blended fabric, from dissolution to weightlessness or residue.
fibre
Of
quality
The fiber content of each component was calculated.
As far as dissolved reagent is concerned, it is necessary to select the reagents which have little or no effect on insoluble fibers. However, in the actual analysis process, insoluble fiber will inevitably lose, which results in the correction of the results.
FZ/T 01026 - 2009 "four component quantitative chemical analysis four component fiber mixture" (hereinafter referred to as the "new standard") is a new standard which has just been implemented in June 1, 2010. According to the standard of FZ/T 01026 - 1993 (hereinafter referred to as the "old standard"), the standard clearly gives the schema of the dissolution plan, modifies the calculation formula, and takes the change correction coefficient to replace the fixed correction coefficient.
This paper compares the differences between the old and new standards in theory and experimental data, and probes into the differences between the old and new standards and some problems that may arise during the pition period.
2 theoretical comparison
2.1 correction factor D value
It is assumed that A, B, C and D represent the first, second, third and fourth fibers in the four component fibers respectively (the same below).
In the new standard, D1 is the loss of B fiber in the first reagent, D2 is the loss of C fiber in the first reagent, D3 is the loss of D fiber in the first reagent, D4 is the loss of C fiber in the first, second reagents, D5 is the loss of D fiber in the first, second reagents, and D6 is the loss of the fiber in first, second, third kinds of reagents.
In the old standard, the fabric of the four component fiber involves only 3 D values. D1 'is the loss of three kinds of fibers in A, B and C in the first reagent, D2' is the loss of A and B fiber in second reagents, D3 'is the loss of A fiber in third kinds of reagents.
In the case of wool / Polyamide / viscose / cotton blended fabric, wool, polyamide, viscose and surplus cotton were dissolved in alkaline sodium hypochlorite solution, 80% formic acid solution and formic acid / zinc chloride solution in turn.
在新標準中，經過堿性次氯酸鈉溶解后聚酰胺、粘膠、棉的質量修正系數分別為d1=1.00，d2=1.00，d3=1.03;經過甲酸溶解聚酰胺后，粘膠的質量修正系數為dⅠ="1.00，棉的質量修正系數dⅡ="1.00，混合物經堿性次氯酸鈉溶液、80%甲酸溶液處理后，粘膠纖維的修正系數是粘膠在兩種試劑中的修正系數相乘即d4=" d1 X dⅠ="1.00 X 1.00="1.00;同理混合物經堿性次氯酸鈉溶液、80%甲酸溶液處理后棉的修正系數d5=" d3 X dⅡ="1.03 X 1.00="1.03;最后用甲酸/氯化鋅溶解粘膠，此時棉的修正系數為dⅢ="1.02，因此經第一、二、三種試劑依次溶解后，棉的修正系數是d6="d3 X dⅢ X dⅡ="1.03" X 1.02 X 1.00="1.05。
According to the old standard, the appendix A Table 1 shows D1 '=1.00, D2' = '1, D3' = '0.99.
It is found that the new standard involves more accurate D value, which combines the loss of fiber in different solvents in each dissolution step and then multiplies.
2.2 calculation formula
In the calculation formula, the new solution dissolves third kinds of fibers.
In this part, such as wool / Polyamide / viscose / cotton mixture, the percentage of viscose is obtained according to the new standard scheme.
According to the old standard, the percentage of viscose is corresponding.
。
Since the coexistence of the two fibers has a certain effect on dissolution during the dissolution process, the new version of the standard modifies this part of the formula based on this.
3 Comparison and analysis of experiments
Based on the basis of comparative experiment, the experimental scheme was chosen to select the same mixture to carry out the same dissolution scheme experiment. The results were calculated according to the old and new standards, and then the differences between the old and new schemes were compared and analyzed.
This experiment involves three solutions. Therefore, three groups of mixtures were selected to carry out the experiment, and the results were calculated according to the old and new standards. The net dry weight and the content of the moisture regain were calculated. The difference between the two contents was compared with the dry weight and dry weight of the table below.
As the new and old standard solutions do not involve changes in the dissolution reagent, the following experimental data will only discuss the changes in the calculation method and the changes in the D value.
Mixture 1: Wool / Polyamide / acrylic / viscose.
Wool, polyamide, acrylic fiber and residual viscose were dissolved in alkaline sodium hypochlorite solution, 80% formic acid solution and two methyl formamide solution respectively.
The experimental results are shown in Table 1.
Table 1 Comparison of 1 new and old standards
Standard dry weight fiber content /% moisture content /%
Wool polyamide acrylic viscose wool polyamide acrylic viscose
New 46.615.720.916.848.314.919.417.4
Old 46.015.921.316.847.815.119.817.3
The difference is very small, and the content of the first dissolved component is the largest.
Mixture 2: Wool / mulberry silk / Polyamide / acrylic fiber.
2 sets of parallel samples were prepared to test the net dry weight and the fiber content of the prescribed moisture regain.
In each group, first samples were dissolved with 75% sulfuric acid solution to dissolve acrylic, mulberry silk and polyamide, and the remaining wool. Second samples were dissolved in alkaline sodium hypochlorite solution to dissolve wool and mulberry silk, and then 80% polycarboxylic acid solution was used to dissolve polyamide residual acrylic fiber, and the content of each component could be obtained by calculation.
The results of the test are shown in Table 2.
Table 2 Comparison of 2 new and old standards
Standard dry weight fiber content /% moisture content /%
Wool mulberry silk polyamide acrylic wool, mulberry silk polyamide acrylic fiber
New 15 31.638.115.315.932.637.014.5
Old 14.131.938.415.615.0 33.137.114.8
It is also found that wool content is the most significant difference.
Mixture 3: Wool / mulberry silk / acrylic / polyester.
2 sets of parallel samples were prepared to test the net dry weight and the fiber content of the prescribed moisture regain.
In each group, first samples were dissolved in 75% sulfuric acid solution to dissolve mulberry silk and acrylic fiber; second samples were dissolved in alkaline sodium hypochlorite solution, wool and mulberry silk were dissolved, and then two polymethylformamide solution was used to dissolve acrylic fiber, and the remaining polyester was calculated according to the results of each step.
The results of the test are shown in Table 3.
Table 3 Comparison of 3 new and old standards
Standard dry weight fiber content /% moisture content /%
Wool, mulberry silk, acrylic fiber, polyester wool, mulberry silk acrylic polyester
New 27.414.438.020.229.615.0 36.419.0
Old 24.217.0 38.620.226.0 17.837.119.1
As can be seen from table 3, the difference between net dry weight and combined moisture regain is very large.
To sum up, the same mixture is calculated by the old and new standards separately. The result of calculation is also changed due to the change of calculation formula and correction factor D value in the calculation process.
The variation of mixture 3 is the largest.
The reason is that when the first solution of the third solution is dissolved in 75% sulfuric acid solution, the quality correction coefficient D of wool is 0.98, while the new edition standard is 1.05.
The experiment also showed that the difference was the largest among the four components, regardless of the wool content, and the mixture was 2 and 3.
The reason is that there is a certain relationship between the chemical properties of wool itself and the wool itself. The wool is acid resistant and alkali resistant. The low temperature and strong acid environment does not damage the wool. The high temperature and high strength acid environment has an effect on wool. The latter two solutions use 75% sulfuric acid solution to dissolve mulberry silk, polyamide and acrylic fiber in a 45 degree water bath. It may play a certain role in the change of wool content, and the specific reasons need further study.
4 Conclusion
Because of clothing
The fiber content identification standard FZ/T 01053 - 2007 stipulates that the tolerance of >15% for fiber is 5%[5].
The detection result of polyamide fiber in mixture 1 is 15.1 according to the old standard, and the test result is 14.9 according to the new standard. If the tolerance difference is 5%, there is a big difference.
Therefore, it is suggested that the inspection department should consider the pition between the old and new standards when issuing the inspection reports.
In addition, some small inspection organizations are not following up with the market in terms of standard updates. After several months of the latest standards, they will even adopt the latest standards, resulting in inconsistent results.
Therefore, it is recommended that the testing institutions should resolutely carry out the latest testing standards, standardize the selection criteria, standardize the textile market order, and safeguard the interests of producers and consumers.
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