About:
2,2',4,4' -tetrahydroxybenzophenone ultraviolet absorber, belongs to the benzophenone ultraviolet absorber series products, absorption wavelength range of 320-400nm, there are symmetrical benzene rings and hydroxyl groups on both sides, its thermal photochemical properties are stable, Are superior to BP-1(UV-O), currently widely used in plastics, resins, coatings, synthetic rubber, photosensitive materials and cosmetics industries, in recent years, the application of fabrics by the textile industry attention, the scope is more and more wide.
Preparation:
In a 150mL three-port flask equipped with agitator and hydrogen chloride absorption system, 1510g resorcinol (0114mol), 1514g 2, 4-dihydroxybenzoic acid (011mol), anhydrous ZnCl22015g(0115mol), POCl33010g(0120mol) and solvent cyclobutyr15 were put into the flask mL, start stirring, mix the material evenly, heat up to 70 ° C ~ 75 ° C, hold for 2h, until little hydrogen chloride gas is released in the absorption system. Then slowly add water to the reaction bottle, stir until all dissolved, then pour it into 800mL cold water, and fully.
The above solution is left for 30min, cooled to below 20℃, pumped, filtered and washed to obtain crude products. Then the crude product is dissolved in hot water, treated with activated carbon, boiled for 30min, heated filtration, cooling, precipitation of a large number of light yellow crystals, pumped and filtered, washed and dried, yellow crystal product 1617g, yield 6719%,mp198℃ ~ 200℃. IR: nu Max (cm - 1) : 3350 ~ 3200 (b, s, nu O -h), 1629 (s, nu C = O), 1590-1450 - s, nu benzene ring), 850-650 (s, the delta benzene - H).
Company Introduction
hebei yanxi chemical co., LTD who registered capital of 10 million yuan, nearly to $2 million, we have a pharmaceutical raw materials factory production of pharmaceutical raw materials, and a reagent r&d center, and we do research and development production of reagent tens of thousands of species. our aim is quality strives for the survival. Seek development by credit reputation. Our products have big price advantage in Europe South America and so on .and Our company also has the advantage of high quality in Africa. in the past two years our products has reached more than 30 countries in the world, Europe. South America. North America, southeast Asia, Africa, etc. We welcome all over the world with the best quality and lowest price friend common cooperation and common development!
Our advantages
1) Timely communication, reply within 12 hours.You can leave any messages on our whatsapp or send email to us.
2)Selecting raw materials strictly,our products are the highest purity.
3)Reasonable and competitive price.
4) Free sample for your evaluation.Customers only need to undertake the shipping fee for delivery the samples to your destionation.
5)OEM/ODM Available.Trial order is available for testing after samples.
6) Packaging can be customized according to each buyers' special request.
We guarantee that your package will pass 100% through the Mexico US, UK, Australia, Netherlands, Canada, France, Germany, Spain, Belgium, Sweden, Poland, Russian, Ukraine, Kazakhstan, Czech Republic, Slovakia, Portugal.
We have freight forwarders in these countries, and our customs clearance company will clear your parcels without any customs issues, sometimes even 1000 kg. Door to door service. Make sure you receive 100% of the goods. Let you have a good experience of our strong freight capacity.
After Sales Service
1) Best quality in your requirement
2)Competitive price in china market
3)Mature technical support
4)Professional logistic support
5 )Full experience of large numberscontainers loading in chinese sea port
6 )Fast shipment by reputed shipping line
7) Packing with pallet as buyer's special request
8) Best service after shipment.
9) Cargoes together with container after-sales service available
10) Full experience in export
11)Raw materials from chinese origin
FAQ
1.What is the way you ship?
Express: FedEx, UPS, EMS, DHL, USPS, TNT, DPD, Aramex etc
Our way of shipping the products is universal and secure.
The company name and other contents related to pharmacy are not written on the package slips.
The way of packing is regularly changed for a secure delivery.
The packages are small in order to avoid unwelcomed questions . If the order is big, then it will be divided into two or more packages
2.Can the packages be trackable?
YES, we provide tracking number and you can track on internet.
3.Where do you ship to?
Worldwide.
4.Do you offer domestic shipping/remail shipping?
Yes we can ship to USA/UK/Canada/Australia/Germany etc warehouse first then to you.
5.Do you ensure your packing, what about customs, what happens if the package is retained?
We concern a lot about our safety system, we pack the orders as secure as possible. If a package is seized at customs, reships of seized orders will be done provided you have a copy of the letter to show us. If you receive a seizure letter, please contact us immediately with a scanned copy of the seizure letter, and also a new address to have your order reshipped to.
6.Which payment options are available?
Bitcoin,Western Union,Bank wire,MoneyGram
China
