What kind of flame retardant fabric is unqualified?
2021-08-24 11:27 | writer: admin
The first is the unqualified pH value, mainly because the molecules of natural fibers such as cotton contain hydrophilic groups such as hydroxyl groups, which have a certain affinity with acids and alkalis. If the washing (neutralization) is not thorough enough during the production process, or washing with water The various finishing agents added in the process are not regulated and controlled, which will cause acid and alkali residues on the fabric. In order to prevent the invasion of diseases and harmful bacteria, human sweat gland secretions are weakly acidic (PH value is 5.2-5.8). If the PH value of textiles in direct contact with the skin is not properly controlled, it will directly affect the PH value of human skin, thereby affecting health. The PH value of flame-retardant fabrics has always been one of the key ecological textile indicators tested by regulatory agencies in various countries, and it is also an indicator of frequent unqualified.
The unqualified rate of color fastness is also very high. Internationally, especially developed countries and regions have put forward mandatory testing requirements for clothing color fastness indicators. For example, Oko-Tex100, which is the most representative in Europe, lists color fastness as a safety item and clearly stipulates specific technical requirements.
The most important flame retardant performance is unqualified. The flame retardant effect evaluation of flame retardant fabrics is basically to first ignite the flame retardant fabric (or put it in a flame) for a period of time. When the fabric is far away from the flame, evaluate its burning difficulty. The degree of ease and flame propagation speed, some foreign customers with high requirements also have to assess the degree of smoke and toxic combustion emissions and other indicators.
At present, the flame retardant effect test methods of flame retardant fabrics mainly include the following:
1. Limiting oxygen index (LOI) method: refers to the minimum oxygen concentration required to maintain the candle-like burning of the fabric when combustion occurs in the mixed gas of oxygen and nitrogen. The larger the limiting oxygen index, the better the flame retardant effect of the fabric. This method is suitable as a test method in scientific research and is not often used in the production of flame-retardant fabrics.
2. Vertical combustion method: refers to the use of a specific ignition source (flame height 40mm) to burn the vertical fabric fixed in the U-shaped clamp at the center 20mm away from the bottom edge of the fabric, and pass the inspection of the fabric within the specified burning time. A method to test the flame retardant properties of flame-retardant fabrics by indicators such as burning state, continued burning time, smoldering time, and damage length. The vertical burning method is mostly used in the flame retardant test of flame retardant fabrics in my country and most countries.
3. 45° inclined plane combustion method: under specified conditions, the sample is placed at an angle of 45°, the sample is ignited for 1S, and the time required for the sample to burn up a certain distance from the flame is used as the evaluation method. Continuous burning and smoldering time, damage area and damage length are used to measure the flame retardant effect of flame retardant cloth.
In terms of flame-retardant performance, some countries will have corresponding flame-retardant standards to stipulate, which makes flame-retardant fabric customers have a basis when purchasing, and will not purchase unqualified flame-retardant fabrics.
At present, the flame retardant test of Yulong laboratory includes physical items related to dyeing, such as light resistance, abrasion resistance, dry cleaning resistance, sweat resistance, and sun resistance, in addition to flame resistance. Ordinary consumers are most concerned about the detection of ecological indicators of clothing, including indicators such as formaldehyde, ph value, flame retardancy, and clothing dye additives that are related to personal safety. Welcome to consult with customers for purchasing.