REACTIVE DYES CAS:2379-74-0

Details:

Our company specializes in processing and selling chemical raw materials, chemical products, pharmaceutical intermediates, veterinary medicine intermediates, dye intermediates, pigments, cosmetics raw materials and chemical reagents,  

Our company has a number of sales team, service and information feedback vertical integration of a sound marketing network, products are sold throughout the country and exported to South Asia, Europe, America, Africa and other more than 20 countries and regions.  

Companies adhering to the "pursuit of quality, innovation and development" business philosophy, to serve as a foundation, for the survival by the quality, seek development by science and technology, adhere to quilty comes first,fair price,good sense of customer service and responsibility. in the future hebei Nengqian import and export trade Co.,Ltd will always hold "integrity, innovation" business philosophy, to achieve honesty management, on the way of specialization, internationalization,  Keep moving!  

 

Product Information:

VAT dye refers to the fiber is reduced under alkaline conditions, and then oxidized, on the fiber to restore the original insoluble dye and dyeing, used for dyeing cellulose fiber; The insoluble VAT dye is made into sodium sulfate, and the soluble VAT dye is used for cotton printing.

 

The reduction process of dyes, that is, the generation of VAT dye cryptochromophores, is generally carried out in alkaline media. In the molecular structure of VAT dyes, there are at least two carbonyl groups (=C=O), which are reduced to hydroxyl group (-OH) by a strong reducing agent sodium disulfite (commonly known as insurance powder). Insurance powder chemical property is very active, in alkaline conditions even if the temperature is very low, can also produce a strong reduction, so that the VAT dye is reduced to cryptoic acid.

Na2S204 + 2H2O -→ 2NaHSO3 + 2[H]

VAT dye

VAT dye

2=C=O + 2[H] -- → 2 ≥C-OH

The hydroxyl compound formed in the reaction is the cryptic acid of the dye, which is also insoluble in water like the dye, but soluble in basic media, becoming the cryptic sodium salt solution. Because the sodium salt of cryptochromic substance does not often show the original color of the dye, it is called a cryptochromic substance:

≥C-OH + NaOH-→ ≥ C-ONA + H2O

FAQ: 
1. Are you a trade company or factory   
We are a  factory with our own trading company.  

2. How do you control the quality   
   Our factory is equipped with professional technicians to control quality, out inspectors take sample for testing every 2 hours to ensure the quality of our production. We also accept BV, SGS or any other Third-party inspection.   
3.  How long is lead time   
   We deliver goods within 3 days for small order, 7-10 days for bulk order.   
4.  Where is your factory located  How can I visit the factory   
    Our factory located in WEIFANG, China. It is only two hours from QINGDAO.  

6. Can i get some samples  
  Yes, we can supply free sample, but the shipping cost be paid by our customers. 

7. How to start orders or make payments  
  Proforma invoice will be sent first after confirmation of order, enclosed our bank information.Payment by T/T,  

8. How to confirm the Product Quality before placing orders  
  You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. 
  You can send us your product specifications and requests,we will manufacture the products according to your requests. 

9. How long is lead time

We deliver goods within 3 days for small order, 7-10 days for bulk order.

 

10. How do you treat quality complaint

  First of all, our quality control will reduce the quality problem to near zero. If there is a realquality problem caused by us, we will send you free goods for replacement or refund your loss.