一二三四区视频,亚洲少妇熟女色,日本久热无码视频网,欧美国产日韩大尺度,亚洲a视频,久久少妇一区二区,日韩999无码视频,刺激久久久久久久,啊啊啊啊不要啊在线

Welcome to chemicalbook!
Chinese English Japanese Germany Korea
010-86108875
Try our best to find the right business for you.
Do not miss inquiry messages Please log in to view all inquiry messages.

Welcome back!

ChemicalBook CAS DataBase List Thiourea
62-56-6

Thiourea synthesis

1synthesis methods
Thiourea is manufactured by heating ammonium thiocyanate at 140-145°C for about 4 hours; equilibrium is established when about 25% of the thiocyanate is converted to thiourea.Thiourea may also be prepared by the interaction of cyanamide and hydrogen sulphide:

Thiourea closely resembles urea in that reaction with formaldehyde gives methylol derivatives and then resinous condensates which on continued heating yield network structures. Thiourea-formaldehyde resins are slower curing than urea-formaldehyde resins and the hardened products are more brittle and more water-resistant. At one time thiourea-formaldehyde resins were added to urea-formaldehyde resins to give mouldings and laminates with improved water-resistance. These mixed resins have now been largely superseded by melamine-formaldehyde resins which give products with better resistance to heat.
-

Yield:-

Reaction Conditions:

with ammonia

References:

Sontakke, Madhuri M.;Jichkar, Atul A.;Dhonde, Madhukar G.;Bhaskar, Chandrakant S.;Berad, Baliram N. [Synthetic Communications,2014,vol. 44,# 3,p. 340 - 345] Location in patent:supporting information

Thiourea Related Search:

德安县| 宁陵县| 泰和县| 长寿区| 赞皇县| 尚志市| 凌海市| 景东| 拜城县| 黔东| 彭水| 巫溪县| 揭西县| 衡东县| 武清区| 锦屏县| 峨眉山市| 井研县| 湖南省| 唐海县| 江津市| 长春市| 泽库县| 阳春市| 青冈县| 青河县| 饶河县| 灵武市| 蕲春县| 汉中市| 滨州市| 潞西市| 荥阳市| 祥云县| 花莲县| 黑龙江省| 宝兴县| 观塘区| 盱眙县| 拉萨市| 澎湖县|