Flame retardant fabrics are divided into natural fiber flame retardant and finishing flame retardant, finishing flame retardant is divided into one-off and durable flame retardant two kinds. Fiber flame retardant is also called permanent flame retardant fabric, fiber itself has flame retardant effect, such as aramid flame retardant fabric, Morric flame retardant fabric and so on. One-off flame retardant fabrics are treated with flame retardants in the later dyeing and finishing of ordinary fabrics. The biggest disadvantage is that the flame retardant effect disappears or evidently declines after washing. Usually we should apply it in some occasions with less washing times. Durable flame retardant fabric is used in cotton fiber and its blended fabrics with flame retardant. The main feature of durable flame retardant fabric is that it has good flame retardant ability within 50 washing times after finishing with this flame retardant. At present, durable flame retardant fabric is the most widely used in the market.
The detection of pH value of flame retardant fabrics has always been one of the key indicators of ecological textiles in various regulatory agencies. At present, the detection of the pH value of the flame retardant has been carried out in the following four aspects:
(1) Extraction medium: distilled water or deionized water, at least to meet the requirements of GB/T6682-2008 grade three water, PH value in 5.0-7.5; potassium chloride solution 0.1ml/L, prepared with distilled water or deionized water.
(2) extractive oscillatory reciprocating mechanical oscillator with a speed of at least 60 cycles per minute and rotating mechanical oscillator with a rotating speed of at least 30 cycles per minute.
(3) temperature at room temperature, generally controlled at 10-30 C.
(4) The oscillation time is (120 + 5) min. If the laboratory can confirm that there is no significant difference between the results of one-hour oscillation test, it can be determined by one-hour oscillation test.
The measurement principle of formaldehyde content in flame retardant fabrics can be described as follows: acetylacetone reacts with formaldehyde in ammonium acetate-acetic acid buffer solution, and the product has the maximum absorption at 412 nm. The formaldehyde is quantitatively analyzed according to the relationship between absorbance at this wavelength and formaldehyde concentration.
A qualified flame retardant fabric can effectively protect people's safety. In the purchase of flame retardant fabrics, we often focus on the effect of flame retardant fabrics will often ignore the PH value of flame retardant fabrics and formaldehyde content requirements. Therefore, the selection of regular flame retardant fabric manufacturers become the primary concern for ordering fabrics.
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