隔靴搔痒
专利名称：METHOD OF OBTAINING A CARBAMIDE-FORMALDEHYDE RESIN AND A
CONDENSATE FOR THE MANUFACTURE OF
THE SAME
发明人：BURYNDIN, Viktor Gavrilovich,GLUKHIKH, Viktor Vladimirovich,LYAKHOV, Valery
房子内部图片
Konstantinovich,MIKHEEV, Anatoly
Alexandrovich
申请号：RU1995000017
申请日：19950201
公开号：WO95/022133P1
公开日：
雪花剪纸19950817
专利内容由知识产权出版社提供
戒指中指
摘要：The invention relates to the chemical and wood processing industries and facilitates the production of a carbamide-formaldehyde resin of low toxicity and with the highly developed adhesive and industrially uful properties of a binder, and of a carbamide-formaldehyde condensate which is stable in storage, of low toxicity and frost-resistant, and has an enhanced dry residue content. The propod carbamide-formaldehyde resin is obtained by carrying out a condensation reaction of carbamide and formaldehyde. The aqueous carbamide solution ud for this reaction in the first stage of the process is a carbamide-formaldehyde condensate or a mixture of individual substances
containing (in wt %): carbamide - 11.4-20.9; monomethylol urea - 24.9-33.1; dimethylol urea - 4.2-9.2; formaldehyde 1.9-2.4; water - the remainder. Formaldehyde is introduced until the molar ratio of carbamide to formaldehyde is 1.0:(1.75-2.1) at a pH of
6.0-8.5. The cond stage of the condensation is carried out at a pH of 3.9-5.1 and a temperature of 82-98 °C. The condensation product is cooled and evaporated and an additional quantity of carbamide is added until a molar ratio (carbamide to formaldehyde) of 1.0:(1.0-2.0) is reached at a pH of
三网融合是指哪三网
7.5-
8.5 and a temperature of 40-65 °C, the resin being subquently cooled and stabilized. The propod carbamide-formaldehyde condensate is obtained by mixing the excess carbamide and the aqueous formaldehyde solution in the prence of an alkali agent at a pH of 8.2-8.8, the molar ratio of carbamide to formaldehyde being (0.8-2.0):1.0. The solution thus obtained is then condend at a temperature of 5-45 °C, and the condensation product is stabilized by being left to stand for not less than three hours. An alkaline environment is created with the aid of aqueous solutions of alkali metal hydroxides, amino compounds or mixtures of the two.
申请人：BURYNDIN, Viktor Gavrilovich,GLUKHIKH, Viktor Vladimirovich,LYAKHOV, Valery Konstantinovich,MIKHEEV, Anatoly Alexandrovich
员工辞职地址：ul. Mira, 19 Ekaterinburg, 620002 RU,pr. Lenina, 70-122 Ekaterinburg, 600062 RU,ul. Novgorodtvoi, 11-194 Ekaterinburg, 620072 RU,ul. Vagonostroitelei, 57-53 Nizhny Tagil, 622052 RU,ul. Lomonosova, 7-12 Nizhny Tagil, 622001 RU
国籍：RU,RU,RU,RU,RU
梦见买了一辆新车代理机构：GOLUBEVA, Ljudmila Petrovna
更多信息请下载全文后查看
>童年趣事500字
