Quick formaldehyde testing method for textiles

Abstract

The invention belongs to the field of textile safety, and discloses a quick formaldehyde testing method for textiles. The method, in which color shades are compared to quickly determine whether a tested textile contains formaldehyde or not and whether the formaldehyde content complies with standard limit requirements or not, is established according to formaldehyde and phenylhydrazine hydrochloride color developing technologies, and has the advantages of high convenience in operation, low cost and high detection speed. The method comprises the following steps: (a) sampling, wherein a sample isweighed and placed in a sampling barrel, and the sampling barrel is lidded; (b) extraction, wherein pure water is added, vibration is carried out, the mixture is kept in a static state for 120 minutes after sufficient soaking, and a test solution is taken out; (c) color developing, wherein a certain amount of a solution to be tested is accurately taken out of the test solution, a phenylhydrazinehydrochloride solution with an equal volume and a ferric chloride solution with the equal volume are added in sequence, and the mixture is shaken well through vibration; and (d) color comparison and determination, wherein the solution color is compared with a standard color chart after 10 minutes, so that the content and concentration range of the formaldehyde in the sample can be determined.

Description

technical field [0001] The invention belongs to the field of textile safety, in particular to a method for rapidly testing formaldehyde in textiles. Background technique [0002] In the production of textiles, in order to achieve anti-wrinkle, anti-shrinkage, flame retardant, etc., or to maintain the durability of printing and dyeing, or to improve the hand feeling, it is necessary to add formaldehyde to the auxiliary agent. Textiles and clothing are products that are in close contact with the human body on a daily basis. People tend to choose pure cotton products for direct skin contact. However, pure cotton products are easy to wrinkle and are the products that use the most formaldehyde printing and dyeing auxiliaries. Therefore, the detection of formaldehyde in textiles and clothing is very difficult. Importantly, textiles containing formaldehyde will gradually release free formaldehyde when people wear and use it, which can cause respiratory inflammation and skin inflamm...

AI Technical Summary

Problems solved by technology

This method is relatively advanced, but there are also obvious shortcomings: first, whether the formaldehyde emission on the fabric surface is sufficient, if the formaldehyde emission on the fabric surface is insufficient, all the data obtained in the subsequent tests will be inaccurate; secondly, the influence of formaldehyde emission on the fabric There are many factors, different colors, different structures, and different post-treatment fabrics have different formaldehyde emission speeds; thirdly, whether the formaldehyde response module absorbs enough, and whether the conversion formula in the subsequent conversion database is reliable, all directly affect the final result; In addition, The test error in the verification data is 13.3%-30.2%, and the error is relatively large. In this case, whether quantitative testing can be performed and how high the accuracy of the data is is still debatable

This method is relatively advanced, but there are also obvious shortcomings: the extraction time of formaldehyde is very short, only 6min-8min, and whether the extraction is sufficient under the condition of 60°C-80°C of the extract liquid, it can be seen from the test data in the patent that the extraction The solution is 60°C, the extraction time is 6min, the formaldehyde content of the sample is 130mg / kg, the extraction solution is 80°C, the extraction time is 8min, the sample formaldehyde content is 256mg / kg, the extraction effect is about twice as bad, the sample used in the experiment is in GB / T2912 .1 "Determination of Formaldehyde in Textiles Part I: The content of formaldehyde extracted from free hydrolyzed formaldehyde (water extraction method) is 210 mg / kg, with a large error

The above methods have the following disadvantages: 1) they are not suitable for on-site detection, and special equipment is required for testing after pretreatment; 2) the detection cost is relatively high, the labor intensity is high, the sample pretreatment is cumbersome, and the inspection time is long

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