Inspection Of Basic Safety Items For Eco Textiles And Textile Products (3)

Three Eco textiles Problems in testing

Relative to the legislation and standardization of the technical requirements of ecological textiles, the development and standardization of the detection technology of ecological textiles are lagging behind both at home and abroad. Although the German government proposed in 1994 to prohibit the use of azo dyes which may reduce the carcinogenic aromatic amines in textile and consumer goods, the corresponding test methods were not formally promulgated until 1998; the European Union's test method standard was released in February 24, 2004 only in the form of EU directive 2004/21/EC; while Oeko-Tex launched Oeko-Tex Standard 100, it issued a guidance document for related inspection items, namely, Oeko-Tex 200, but did not provide corresponding testing standards, and even some items were clearly informed that there was no suitable detection method. All these bring difficulties to the implementation of relevant regulations and standards. There are 3 main reasons for these problems:

1) the definition of eco textiles in different countries and their differences in technology and economic development level, so far there is no uniform ecological textiles. international standard 。

2) the detection technology of textile ecological safety is difficult.

3) the advanced detection equipment used for testing will greatly increase the cost of detection.

4 basic safety items for textile products

Four point one formaldehyde content

Formaldehyde is a colorless, strongly irritation odorant, easily soluble in water and ethanol, usually in aqueous form. Formaldehyde is an important organic material (aldehyde and carbonyl), widely used in the chemical industry, mainly for the plastics industry (such as phenolic resin, urea formaldehyde plastic electric jade), synthetic fiber (such as synthetic Vigny nylon polyvinyl formal), leather industry, medicine, dye and so on. The harm of formaldehyde to health is mainly in the following aspects:

1) stimulation: the main hazard of formaldehyde is the stimulation of respiratory tract and skin mucous membrane. Formaldehyde is a toxic substance to the protoplasm of biological cells. It binds with proteins in organisms, changes the structure of proteins and solidifies them. Respiratory irritation and edema, eye irritation and headache were found at high concentration inhalation.

2) sensitization: direct contact with formaldehyde can cause allergic dermatitis, stain and necrosis. Inhalation of high concentration of formaldehyde can induce bronchial asthma.

3) mutagenic effect: high concentration formaldehyde is also a genotoxic substance. Laboratory animals can cause nasopharyngeal tumors in high concentration inhalation.

Formaldehyde is characterized by headache, dizziness, fatigue, nausea, vomiting, chest distress, eye pain, sore throat, stomach difference, palpitations, insomnia, weight loss, memory impairment and autonomic nervous disorder. Prolonged inhalation of pregnant women may lead to fetal deformities or even death, and male inhalation can cause sperm deformity and death.

In order to prevent shrinkage, wrinkle and smooth appearance, the main fabric of general cellulose fiber needs to be sorted out. The use of finishing agent gradually releases formaldehyde from the wearing and using process, which is the main source of free formaldehyde. [2]

4.2 pH value test

　　 Under normal circumstances, the pH value of human skin varies from 5.5~7.0 to slightly acidic. This is due to the secretion of lactic acid from the sweat glands of the human body. It also makes the skin acid when sweating. Its pH value is 5.2 to 5.8. The acidic environment on the human skin surface can protect the balance of the permanent bacteria and prevent the invasion of pathogenic bacteria. Therefore, the pH value of the textiles is beneficial to the protection of the human body by [2]. However, cellulose fiber based fabrics will be treated with strong alkali solution before pretreatment, which will achieve the desired effect. This is an important reason for the unqualified results of the determination of pH value of textiles, and will also cause some harm to the human body. The most common cause of human body hypersensitivity caused by clothing is skin contact with residual alkali remaining on clothing because it has not been cleaned.