查询词典 formaldehyde

An aminobenzene sulfonate-formaldehyde based polymer dispersant with good grinding efficiency was synthesized under alkaline condition using aminobenzene sulfonate, phenol and formaldehyde as main raw materials.

0引言众所周知，在陶瓷工业生产中，原料细磨是其中一道关键的工序，是一个高能耗、低效率的作业过程，却又是必不可少的一个工艺过程。

An aminobenzene sulfonate-formaldehyde based polymer dispersant with good grinding efficiency was synthesized under alkaline condition using aminobenzene sulfonate, phenol and formaldehyde as main raw materials.

以对氨基苯磺酸、苯酚、甲醛为主要原料，采用碱性合成线路制备了具有助磨效果的氨基磺酸系高效减水剂，系统地研究了单体比例、单体浓度、交联剂用量、反应体系初始pH值、反应时间和反应温度等因素对助剂助磨效果的影响。

In the presence of ethanol- HCl solution, arylamine-HCl and w=37% aqueous formaldehyde solution or the condensation product of arylamine and formaldehyde are directly reacted with ethyl 3-oxo-2-phenylmethylenebutyrate to form l-aryl-2-phenyl-3-carbethoxy-4-piperidone.

2－苯亚甲基－3－丁酮酸乙酯与芳香胺和w＝37％甲醛水溶液或芳胺和甲醛的缩合物在氯化氢－无水乙醇存在下可直接发生的Mannich反应，得到1－对位取代芳基－2－苯基－3－羰乙氧基－哌啶－4－酮。

BS 6806-2002 Textiles - Determination of formaldehyde - Method for the determination of total and free formaldehyde using chromotropic acid

使用铬变酸法测定甲醛的总含量和游离部分的含量

The results of the herbicidal effects study display that 1,4-dioxoquinoxaline formaldehyde-salicylic aldehyde dihydrazone and 1,4-dioxoquinoxaline formaldehyde acetone dihydrazone have obvious herbicidal activity.

研究结果表明1，4-二氧喹喔啉-2-甲醛-水杨醛双腙和1，4-二氧喹喔啉-2-甲醛-丙酮双腙表现较明显的活性，在500mg/L浓度时对稗草的株防效分别为51.3%和55.0%；对油菜株防效较弱，分别只有33.5%和17.5%。

Being Compared contact angle changes of various adhesives on different surface of Moso bamboo and Chinese fir with the coefficients of penetrability, it was found that wettiability of polymeric diphenylmethane diisocyanate adhesive was much better than emulsion polymer isocyanate adhesive, wettiability of phenol-formaldehyde adhesive and urea-formaldehyde adhesive were in the middle of above two adhesives.

通过研究不同胶粘剂在毛竹表面的接触角变化，并结合胶粘剂渗透扩散系数，发现聚异氰酸酯胶在竹材表面的润湿性较好，而双组分乳液型聚异氰酸酯胶的表面润湿性较差，酚醛树脂胶和脲醛树脂胶润湿能力处于二者中间。

The superplasticizer CS-SR3 is completely different from traditional formaldehyde or lignosulphonate based water-reducing admixtures.CS-SR3 is a new kind of high performance polycarboxylate water-reducing admixture without any formaldehyde.

超塑化剂CS-SR3与传统的由甲醛、萘磺酸缩聚而成的萘系和木质素磺酸盐减水剂是完全不同的，是一种新的完全不含甲醛的高性能聚羧酸系高效减水剂。

The superplasticizer CS-SP1 is completely different from traditional formaldehyde or lignosulphonate based water-reducing admixtures. CS-SP1 is a new kind of high performance polycarboxylate water-reducing admixture without any formaldehyde.

超塑化剂CS-SP1与传统的由甲醛、萘磺酸缩聚而成的萘系和木质素磺酸盐减水剂是完全不同的，是一种新的完全不含甲醛的高性能聚羧酸系高效减水剂。

The superplasticizer CS-SX1 is completely different from traditional formaldehyde or lignosulphonate based water-reducing admixtures. CS-SX1 is a new kind of high performance polycarboxylate water-reducing admixture without any formaldehyde.

超塑化剂CS-SX1与传统的由甲醛、萘磺酸缩聚而成的萘系和木质素磺酸盐减水剂是完全不同的，是一种新的完全不含甲醛的高性能聚羧酸系高效减水剂。

It is very important to expore the genotoxity of formaldehyde, toxicity mechanism and repair for understanding formaldehyde genotoxicity as well as nosogenesis completely and systematically. In addition, this research will benefit a lot to estimate and improve the indoor air quality by providing scientific foundation and make a safe environmental and occupational concentration standard.

探讨甲醛的遗传毒性，毒性机制等，对全面和系统的了解甲醛的遗传毒性的致癌性，进一步评价和改善室内空气质量具有十分重要的意义，并为制定安全的环境和职业浓度提供更科学的依据。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。