The content of biuret by colorimetry and the total content of nitrogen in urea and biuret were mensurated.

摘 要：對固相法和液相法合成氰尿酸的方法進(jìn)行比較在线视频福利资源，采用比色法測定縮二脲含量我色国产综合，用甲醛測定尿素影音最新资源在线观看、縮二脲的總氮量在线免费观看95视频，由縮二脲的含量在线色影视、總氮量推算出尿素的含量及產(chǎn)品的純度欧美另类福利视频，從而說明液相法的優(yōu)勢。

In this paper the two rapid determining methods for carbamide in milk,p-dimethylaminobezaldehyde mehod and nitrite-Griess method,were developed.

建立了對二甲氨基苯甲醛法和亞硝酸鹽—格里斯試劑法對牛奶中摻入尿素的快速檢測方法黄色十八岁网站。

In acidic condition, the extractive form waste water in hardboard production reacts with extra amount of formaldehyde at 1-5∶1 (formaldehyde : solid extractive, based on weight) to prepare extractive-formaldehydecomplex, then urea or phenol is added into the solution of this complex and reacts with unreacted formaldehyde to form a new adhesive system.

利用纖維板生產(chǎn)中廢水提取物與過量甲醛(甲醛溶液與粉狀廢水提取物的重量比為1～5：1)在酸性條件下可制成纖維板廢水提取物-甲醛復(fù)合體黄色视频一区二区三区在线看，此種復(fù)合體反應(yīng)液中的過量甲醛再用尿素或苯酚吸收，從而制成尿素改性纖維板廢液膠欧美性人成三级视频。

In addition, the pendent urea may be useful as a reactant for formaldehyde to reduce emissions of formaldehyde.

另外欧美黑人日韩一级视频在线观看免费，下垂尿素也許是有用作為甲醛的反應(yīng)劑能減少甲醛放射。

Regarding polyurethane varnish as host of the formaldehyde absorbent,mainly aminoacetic aicd , casein, tannins, L - glutamate, DL - a - amino acid, urea, hexamethylenetetramine, lignin and molecule are chosen to serve as formaldehyde absorbent.

以硝基清漆為吸收基質(zhì)日韩在线综合自拍视频网站免费，主要選擇了如氨基乙酸成年欧美1313www色、干酪素、鞣質(zhì)亚洲全网黄色网站、L-谷氨酸在线视频产自拍、DL-α氨基丙酸、尿素理论片235影院、六次甲基四胺人人操人人爽人人浪、木質(zhì)素、分子篩等作為甲醛吸收劑看中国免费黄色视频A，涂布于聚氯乙烯膠片上做甲醛吸收測試jizzjizz日本高清视频免费；根據(jù)測試結(jié)果，制作的甲醛吸附劑能起到較好的甲醛吸收效果欧美熟女高潮；并探討了硝基清漆中吸收劑用量的篩選及吸收時(shí)間對甲醛消除的影響因素久久美女夫妻性爱真实视频。

Main connections are methenyl ether linkage and methenyl. From the end of heat preservation to the end of whole reaction, main reaction was polycondensation. In general, there were three types reaction among melamine modified UF resin, urea-formaldehyde system, melamine-formaldehyde system and melamine-urea-formaldehyde system.

保溫反應(yīng)結(jié)束直到整個(gè)反應(yīng)結(jié)束，縮聚反應(yīng)為主要反應(yīng)類型国产色一区二区免费视频，三聚氰胺改性脲醛樹脂中存在著3種反應(yīng)體系：尿素甲醛的反應(yīng)體系欧美国产A片免费久久、三聚氰胺甲醛反應(yīng)體系和三聚氰銨尿素甲醛共縮合反應(yīng)體系欧美一级爱爱视频一区二区。

The uron content was determined and the effects of pH value, temperature, reaction cycle and catalyst species on the Uron content were also discussed by FTIR quantitative analysis by uronizing urea-formaldehyde derivatives at the beginning of the reaction before the synthesis of UF resin.

采用在脲醛樹脂合成初期對尿素－甲醛衍生物進(jìn)行Uron化反應(yīng)后，再進(jìn)行UF樹脂合成的技術(shù)方法一级片电影网站，通過FTIR定量分析亚洲最大黄网欧美在线，研究了不同pH值、反應(yīng)溫度最黄视频一区二区三区免费观看、反應(yīng)時(shí)間及催化劑種類對尿素與甲醛成環(huán)化反應(yīng)的Uron相對值的影響黄色网站日韩。

The results show that urea-formaldehyde resin can effectively capsulize an organic material of paraffin.

以石蠟為囊芯，尿素-甲醛樹脂為囊壁欧美粗硬大，運(yùn)用原位聚合法合成相變儲(chǔ)能微膠囊材料50,60,70老熟妇视频。

During the 1970s, urea-formaldehyde foam insulation was used in many homes.

在20世紀(jì)70年代，尿素甲醛泡沫絕緣材料曾在許多家庭免费观看黄网站色视频免费。

A study of the application of cyclic ethylene urea-formaldehyde resin finish on cotton and viscose rayon fabrics has been made.

根據(jù)國內(nèi)的需要和已有的資料欧美日韩精品视频一区在线看，我們對環(huán)亞乙基尿素——甲醛樹脂在棉布及人造棉織物上的應(yīng)用，進(jìn)行了初步的研究欧美自拍日韩极速视频直播。