How to Make a White Fabric
The cause and solution of most of the seed shell remaining on the fabric and insufficient whiteness,How to Make a White Fabric
At the same time of desizing, the oil and wax in raw cotton components are saponified, which has a certain boiling effect.During the boiling process, not only the oil, wax, pectin, ash and lignin in the cotton components were removed, but the slurry was further removed and some pigments were removed.In the bleaching process, hydrogen peroxide can not only remove the pigment, but also remove the residual slurry and some impurities.In the conventional process, caustic soda is used as desizing and boiling, while in the hydrogen peroxide bleaching process, caustic soda is only used to adjust the pH of bleaching solution.As the alkali is the activator of hydrogen peroxide, if the alkali concentration is increased, the hydrogen peroxide will be decomposed to form H00- at the same time. As the reaction speed increases, a large amount of reactive power consumption of hydrogen peroxide is caused.More importantly, due to the excessive activation of hydrogen peroxide, H00· free radical formation is promoted, which has certain damage to the fiber.
In addition, heavy metal ions such as Fe2+ and Cu2+ can inevitably exist in fabrics, water and equipment during production, which will also cause the hydroperoxide cracking and decomposition, thus causing the chain reaction.Therefore, to strictly control the amount of hydrogen peroxide in a strong alkali bath, the stabilizer must meet three functions:
Surface stabilized hyperhydroxyl anions (HOO-);
The layer shielding heavy metal ions;
Activation inhibits the production of hydroxyl radical (HOO) in large Numbers.
In the conventional bleaching process (pHl0 ~ 11), hydrogen peroxide is excited by alkali and mainly forms HOO-.
At this point, due to its polymer network structure shielding heavy metal ions, water glass can adsorb Fe2+ and seal HOO -, making Fe2+ not catalyzed and inhibiting the formation and decomposition of H00· free radicals.Water glass can also combine with Ca2+ and Mg2+ ions in the bleaching liquid to form highly dispersed magnesium silicate, calcium silicate colloid, which is adsorbed on the surface of the catalyst, making it lose its activity and thus play a stabilizing role.If water glass is bleached in soft water, there is no stabilizing effect, on the contrary, the decomposition of hydrogen peroxide will be accelerated due to the increase of pH value.However, when the content of Fe2+ exceeds the adsorption capacity of water glass, it will weaken the stabilizing effect.For this, although water glass stabilizes the effect to be good, the price is cheap again, but in strong alkali retreat, boil, float one bath method, water glass cannot satisfy above function.Therefore, it is unreasonable to use water glass alone as stabilizer in the prescription.If the water glass and magnesium sulfate and complexing agent are mixed in a certain proportion, it can be suitable for one bath process.
Scouring agent used in other prescription and net lotion, certain requirements can alkali resistance, good permeability in alkali bath, to have emulsification, washing, solubilization and dispersion effect, cloud point, if the quality can not meet the requirements, the same to retreat, boiling and bleaching one bath effect bring certain influence, in short, as long as you select the best hydrogen peroxide stabilizer and scouring agent, penetrating agent, and control the process conditions, properly solve the excessive alkali, activation, and stable relations, a certain can make the refund, boiling and bleaching one bath process to achieve the ideal effect.
In addition, too much water glass, hydrogen peroxide residue, not enough to play the role of bleaching.
It reduces water glass consumption and increases chelating stabilizer.
The concentration of male caustic soda can be increased and the residual rate can be increased.
(4) steam temperature can be increased to 105-110 ℃.
Our company produces many kinds of polyester and cotton fabric,There are many types: Uniform Fabric
, Pocketing Fabric, canvas fabric，which is mainly used in garment industry,
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