Cotton PROBAN flame retardant process

I. Introduction
Proban flame retardant process originated in the United Kingdom Aowei company, the main component is tetramethylol phosphate (THPC) and amide low molecular pre-shrinkage. After the fabric has been impregnated with Proban flame retardants, the preforms formed by THPC and amide penetrate into the amorphous region and the gap of the fibers. Then, NH3 is crosslinked with the hydroxymethyl group in the pre-shrinking, The formation of flame-retardant polymer after oxidation to stabilize. Therefore, the Proban method of dealing with the fabric after the soft, strong loss of Xiao, basically keep the fabric comfortable horse and durability. Suitable for all kinds of protective clothing, bedding, decorative supplies and children's fire-retardant pajamas, etc., is the durable cotton fabric flame retardant finishing an important way.
Second, the principle of flame retardant
The phosphorus-containing compound causes the cellulose fibers to undergo dehydration reactions during the thermogravimation process. Phosphorus-containing flame retardants in the fiber pyrolysis temperature range is first decomposed into less volatile phosphoric acid or polyphosphoric anhydride and cellulose hydroxyl (-OH) dehydration reaction, the fiber carbonization. In the ammonia smoked process, the P-N synergistic effect is produced due to the formation of a highly cross-linked polymer of phosphorus dichloride in the cellulose during the process of ammonia-impregnating the Prond flame retardant. P-N bond performance (polarity) higher than the P-O bond to phosphorus compounds and-OH reaction performance is enhanced, resulting in efficient and durable flame retardant properties.
Third, the process
(100 ~ 120 ℃) ​​→ (___) Ammonia Smoke → Oxidation Washing → Drying (130 ~ 140 ℃) → Pre-shrinking → Finished product.
Fourth, the process conditions
1, the determination of flame retardant concentration: in the process of developing the process, should be based on the thickness of the fabric and the rolling liquid rate to determine:
① Determination of rolling fluid rate:
A, rolling liquid rate according to the following formula
Where: I: rolling liquid rate (%); M: dry weight of fabric (g);
N: weight of fabric after padding (g)
B, the choice of rolling fluid rate:
According to the performance of the fabric itself and the capacity of the roll, the general cotton yarn card selection 70 ~ 75%, cotton canvas selection 80 ~ 85%.
Determination of the concentration of padding liquid: calculated according to the following formula
C = B / A
Where C: the concentration of the padding solution (%); B: the amount of flame retardant (relative to the weight%)
A: rolling liquid rate
The choice of the amount of flame retardant (B):
Generally for the thin fabric, the amount of Proban on the fabric should be more than 40% of the fabric weight, medium and thick fabric can be 35 to 40%, and then according to the choice of rolling liquid rate into the above formula can get the best concentration ⅲ
2, with the tide of the dawn:
After drying the fabric by the soaked flame retardant, there must be a certain degree of humidity in order to facilitate ammonia smoked NH3 and fabric on the flame retardant cross-linking reaction, play a flame retardant effect, and has a washability. The general containing tide should be controlled between 12 ~ 16%, the left and right tide error can not exceed 2%, otherwise it is easy to produce left and right color, so the production process should always monitor the tide rate of dawn, and adjust at any time , Containing tide over Xiao will lead to cross-linking is not full, the effect of flame-resistant washing, containing the tide will lead to excessive cross-linking, feel hard, color changes are also large.
3, ammonia flow to determine:
From the front of the reaction point of view, the amount of ammonia per kilogram of flame retardants in theory is certain, but the actual production process should be slightly overdue, so that cross-linking full. Usually ammonia flow control in the 350 ~ 500L / min flow too dawn, cross-linking is not sufficient, poor resistance to poor washability; flow is too large, resulting in waste and ammonia spill, resulting in poor working environment. Practical application, should also be based on the thickness of the fabric and the amount of flame retardants to adjust the ammonia flow to achieve the best flame retardant effect.
4, the concentration of oxidants
Flame retardant by ammonia smoked to make it more stable, must be P + 3 oxidation to P +5, usually by padding H2O2 method to achieve, H2O2 dosage should be based on the thickness of the fabric, the amount of flame retardants Dawn to set. Usually the amount of 30 to 35% of the concentration of ⅲ soaking the speed of the oxidation solution can not be too fast to ensure that there is enough H2O2 to stay on the fabric, the oxidation and then neutralized soap and wash, the oxidation time should not be too long, otherwise it will reduce the fabric Strong.
Five, conclusion
The flame retardant fabric is excellent in flameproof, and it meets the requirements of international GB-8965-98 <flame retardant protective clothing. It also meets the requirements of EN470, EN470-1, EN533, EN531, BS5852, And other standards, through the European body, the United States, the United Kingdom, the first batch of flame-retardant fabric testing, it is low toxicity and environmental protection of the human body safe and reliable, breathable, moisture, feel soft and comfortable, has been accepted by the world.

Xinxiang City Yulong textile specializing in the production of flame-retardant fabrics, fluorescent fabrics, anti-arc fabric and other functional fabrics and custom fire-retardant clothing​, fluorescent clothing and other multi-functional clothing.