congo red test

The oxalic acid was cauterize in the muffle at 200 ℃ until fully volatilized. The solution pH was adjusted with drop ( 1+ 1) hydrochloric acid ( the congo red test paper change color from red to blue) to about 4 to remove carbon dioxide.

在马弗炉（200℃）灼烧至草酸全部挥发，滴加（1+1）盐酸，使刚果红试纸由红变蓝色（或调节pH到4左右），除去二氧化碳。

And research of thermal stabilizer on zinc acetate-stearic acyloxy and zinc acetate-stearic acyloxy plus calcium stearate by means of test method for thermal aging and Congo red test paper etc is given in the paper.

以硬脂酸锌作为对照物，通过热老化箱实验法、刚果红试纸法等多种方法对硬脂酰氧基乙酸锌及硬脂酰氧基乙酸锌/硬脂酸钙进行了热稳定性的研究。

The results of the Congo Red test showed that calcium stearate, zinc stearate, or barium stearate which was used single is not a good thermal stabilizer for flexible PVC.

结果表明：在软质PVC体系中单独使用金属皂类热稳定剂时软质PVC的热稳定性能不好；

The vitro methods include autoagglutination test, calcium dependency test, pyrazinamidase test, salicin fermentation, esculin hydrolysis, Congo red colony test and virulence plasmid.

体外法包括自凝试验、依钙试验、吡嗪酰胺酶试验、水杨苷发酵、七叶苷水解、刚果红菌落试验和毒力质粒。

Congo red test showed that the stabilizing time increased when the stabilizers' concentration increased. The order of stability of this four rare-earth stearates is Last> Ndst> Yst> Dyst.

刚果红法测定结果表明，随着硬脂酸稀土用量增加，PVC的热稳定时间呈现增加的趋势，4种不同稀土硬脂酸盐稳定能力大小顺序为Last>Ndst>Yst>Dyst。

Experiments on the transition time of Congo red test paper showed that the thermal decomposition time of nano-PVC composite resin was nearly ten times longer than that of traditional PVC resin.

185℃刚果红试纸变色时间试验证明，纳米复合PVC树脂热分解时间比传统产品延长了近10倍。