查询词典 acetalization

In addition, when the modified PVA resins fulfilled requirements in the following: 1 the acetalization degree varied from 60 mol% to 80 mol%, 2 the esterification degree varied from 10 mol% to 20 mol%, 3 the amount of hydroxyl group was 5-25 mol%, 4 the range of value of B/P(the mass ratio of the binder to diazo resin) was from 4 to 4.5,5 the range of its molecular weight was from 4×10^5 to 8×10^5, the negative PS plate obtained had excellent sensitivity, hydrophobic property, good developability, good ink receptivity and good scratch resistance.

因此其分子量、酯化度和缩醛度的确定，必须综合考虑各项性能之间的平衡。缩醛度为60-80 mol%，酯化度10-15mol%，羟基5-25 mol%，分子量约为4-8万，B/P为4-4.5时，制得的阴图PS版的感度、显影性、着墨性和耐磨性都较好。

Ethylene glycol glycosides,useful as humectant in cosmetics,were prepared by phosphoric acid-catalyzed acetalization of glucose with ethylene glycol.

在磷酸催化下，由葡萄糖和乙二醇经缩醛化反应制备了乙二醇葡糖苷，可用作化妆品保湿剂。

Results showed that KHSO4 was an efficient catalyst for the acetalization and ketalization with high conversion and selectivity in mild conditions.

系统考察了反应时间、醛与醇的配比、KHSO4的用量及催化剂重复使用等因素对反应的影响，优化了反应条件。

The results showed that FeCl3 was an efficient catalyst for the acetalization and ketalization with high conversion and selectivity in mild conditions.

考察了反应时间、醛与醇的配比、FeCl3的用量及催化剂重复使用等因素对反应的影响，优化了反应条件。

Methods for calculating the acetalization degree and the ratio of 1,2-and 1,4-additions according to the results of chemical analysis have also been suggested.

还提出了根据化学分析结果计算聚乙烯醇缩丁烯醛的缩醛度以及这两种加成方式的分率的方法。

In this paper, the acetalization of benzylaldehyde and 1,3-propanediol in the presence of vanadium phosphorus oxide catalyst was studied.

研究了苯甲醛与1，3-丙二醇在钒磷氧催化剂作用下的缩醛化反应，考察了反应时间、醇醛比、催化剂用量、带水剂种类和用量等因素对苯甲醛1，3-丙二醇缩醛收率的影响。

Acetalization increased the tensile strength and density of fibers.

实验表明强度和密度最大值的共混比为(10%～20%)/(90%～80%)。

The acetalization parameters including acetalization time, acetalization temperature,amounts of sulfate and amounts of formaldehyde were investigated.

研究了不同的缩醛化浴配方以及缩醛化条件对胶原蛋白/PVA初生复合纤维中的蛋白质存留率、水中软化点的影响，确定了较合适的缩醛化浴配方及缩醛化条件。

Studies on Acetalization of Litsea Cubeba Oil with Glycol Catalyzed by Dealuminated USY;3. on the esterification and acetalization reactions was discussed.

通过酯化反应和缩醛化反应，考察了含硅二烃基锡二芳香羧酸酯在有机反应中的催化活性，讨论了催化剂用量、反应时间和溶剂等因素对催化反应的影响。

GA and BASANa were used as cross-linkers and a donor of hydrophilic groups (-SO3H), which they both crosslinked to PVA chains for the acetalization reaction.

GA和BASANa皆接在聚乙烯醇链上产生acetalization反应，并分别当做交联剂和提供磺酸根基(-SO3H)的亲水基。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。