Bleaching solution containing hydrogen peroxide (100%) of 2
The ② affect the hydrogen peroxide bleaching of factors:
(A) concentration: with chlorine bleach is similar to when the bleaching solution of hydrogen peroxide concentration of
(B) the influence of temperature: hydrogen peroxide decomposition rate with increasing temperature increases, so can be used elevated temperature to shorten the bleaching time, generally 90 to 100 ° C, Buy Swooper Flags hydrogen peroxide decomposition rate of up to 90% Whiteness is also the best. The cold bleaching law should increase the concentration of hydrogen peroxide, and extension of the bleaching time.
(C) the pH value of: hydrogen peroxide in an acidic bath is relatively stable, Garden Flags Manufacturers industry used about 30% to 35% concentrated solution of hydrogen peroxide content, which often add a small amount of sulfuric acid in order to maintain stability. Rate of decomposition of hydrogen peroxide in an alkaline bath with the pH value increases with increasing pH value of 13.5 has a bleaching effect, but the pH value of 9 to 10, the fabric whiteness up to optimal levels. actual production mostly will drift pH value adjusted to about 10. Advertising Feather Flags And Banners
(D) bleaching of metal ions and the role of stabilizer: water, iron salts, Garden Flags Manufacturers copper salts, and iron, copper scrap and dust, hydrogen peroxide has a catalytic decomposition, so that hydrogen peroxide is decomposed into water and oxygen, thus losing the bleaching effect. Oxygen to penetrate into the fabric internal bleaching when the high temperature under alkaline conditions will allow the cellulose fibers is seriously degraded, Printed Teardrop Flags and often produce the hole in the fabric. In order to prevent these flaws in the bleach solution by adding the appropriate amount of stabilizer to reduce the hydrogen peroxide decomposition rate. Stabilizer in the water glass earlier, the stability of the mechanism of the sodium silicate is not very clear, suggesting that calcium silicate or magnesium silicate, colloidal hydrogen peroxide decomposition with Personalized Advertising Flags catalytic metal ion adsorption. Garden Flags Manufacturers The water glass is inexpensive and easy to get good stabilizing effect, but long-term use, easy to difficult to remove the silica scaling in the guide rollers, etc., affecting the fabric quality. The present study used a non-silicate stabilizer, mostly belonging to the organic phosphates, the effect is better, no fouling, but the price is higher than the silicate, water glass still in production to continue to use. Sometimes blending phosphorus compounds with sodium silicate to use, but also achieve better results. Garden Flags Manufacturers
③ hydrogen peroxide bleaching: In addition to steaming bleaching method is widely used, hydrogen peroxide bleaching method there are the following types:
(A) chlorine – oxygen pairs drift method: chlorine bleach, oxygen bleach, oxygen bleach both dechlorination and the bleaching effect, this law can reduce the concentration of hydrogen peroxide in the bleaching solution, the process is: Garden Flags Manufacturers
Rolling sodium hypochlorite bleach solution → stacking → washing → ran over the hydrogen peroxide bleaching liquid → steaming → washing.
Sodium hypochlorite bleach solution containing available chlorine 1 ~
(B) cold pad-batch method: In order to meet the many varieties, small batch, varied requirements, especially for small and dyeing mill, cold bleaching method can be used in the absence of oxygen bleaching equipment. The high concentration of hydrogen peroxide in the bleaching solution of this method, and added sulfate, Garden Flags Manufacturers fabric rolling drift-fluid, rolling immediately with plastic film coated to prevent evaporation drying, and then stacked at room temperature. Although this method a long time, low productivity, but more flexible. The bleaching solution containing hydrogen peroxide (100%) 10 ~