共查询到19条相似文献,搜索用时 140 毫秒
1.
2.
3.
以2种常用荧光增白剂CBS-X和31#及二者的复配物配入到织物洗涤剂中,采用分光光度计考察洗涤后的织物增白性能。结果表明,CBS-X和31#含量超过0.10%时,机织棉布对两种荧光增白剂的吸附渐趋饱和;L*值大于96.0的高亮度机织棉布的增白主要归因于蓝光补偿;国标条件洗涤40min后溶液中的增白剂与机织棉布上的增白剂形成吸附-脱附平衡;同条件下洗涤超过5次后荧光增白剂很难再吸附在机织棉布上;织物纤维上污垢剥离阻碍荧光增白剂的吸附。 相似文献
4.
三嗪基氨基二苯乙烯型荧光增白剂研究新进展 总被引:13,自引:2,他引:13
介绍了三嗪基氨基二苯乙烯型荧光增白剂的结构、性质、增白机理及影响其增白效果的因素,重点讨论了其合成与共聚改性、晶型改变与复配。按照亲核性由弱到强次序,原料依次与三聚氯氰反应,其中,含烯丙醇基或丙烯酰胺基的荧光增白剂与苯乙烯或丙烯腈共聚,可使其荧光反式活性分子固定在大分子链上,显著提高其增白性能、光化学稳定性和荧光量子产率,同时降低其光致异构现象;对得到的无定型增白剂进行转晶,可防止黄变,提高其商业价值;复配则对增白剂光吸收和荧光发射起到加和增效作用。指出今后应重点开发高效环保液态型及耐强酸强碱的荧光增白剂,并认为膜分离技术、中间体质量的提高以及复配增效将是研究热点。 相似文献
5.
6.
本文综述了苯并噁唑类荧光增白剂的主要品种,典型产品的合成工艺,该类荧光增白剂的主要应用领域及应用方法,重点介绍了该类荧光增白剂各品种之间及和其它化学结构类型荧光增白剂之间按一定比例混合复配后使用能产生加和增效的效果。简介了国内生产现状。提出发展过程中要重视的问题。 相似文献
7.
本文综述了苯并噁唑类荧光增白剂的主要品种,典型产品的合成工艺,该类荧光增白剂的主要应用领域及应用方法,重点介绍了该类荧光增白剂各品种之间及和其它化学结构类型荧光增白剂之间按一定比例混合复配后使用能产生加和增效的效果。简介了国内生产现状。提出发展过程中要重视的问题。 相似文献
8.
9.
10.
综述了香豆素类荧光增白剂、三嗪氨基二苯乙烯类荧光增白剂、含酮类荧光增白剂以及复配型荧光增白剂等在纺织物洗涤添加剂中的应用研究进展,并展望了其今后的发展前景。 相似文献
11.
12.
13.
14.
15.
16.
《国际聚合物材料杂志》2012,61(10):1023-1039
This article reports on the physico-mechanical properties, chemical resistance, aging properties, sorption, diffusion, and permeability of ketones (cyclohexanone and acetone) through vulcanizates from blends of natural rubber (NR) and epoxidized low molecular weight natural rubber (ELMWNR) compounded by three different mixing schemes. The compounding ingredients were mixed with the two mentioned rubbers using three different mixing schemes by adopting a semi-efficient sulphur vulcanization compounding formulation. In Scheme 1, the natural rubber and ELMWNR were first mixed before adding the compounding ingredients. In Scheme 2, the compounding ingredients were first mixed with the NR before adding the ELWMNR and in Scheme 3, the compounding ingredients were first mixed with the ELMWNR before adding the NR. The physico-mechanical results of the vulcanizates showed that changes in the mixing schemes significantly influence the tensile properties of the vulcanizates. The tensile strength of the vulcanizates prepared with mixing Scheme 2 were 4.3 MPa lower than vulcanizates from Scheme 1, whereas Scheme 3 was lower than Scheme 1 with 8.5 MPa. The aging results of the vulcanizates from all the mixing schemes were found impressing. The activation energy and free energy change were highest for Scheme 1 whereas the extent of cyclohexanone and acetone penetrations were the lowest with Scheme 1, signifying well crosslinked and ketone resistant vulcanizates. 相似文献
17.
18.
The compounding process directly influenced the compounding quality of wood–polymer blends and finally affected the interfacial bonding strength and flexural modulus of the resultant composites. With 50 wt % wood fiber, the optimum compounding parameters for the wood‐fiber/high‐density‐polyethylene blends at 60 rpm were a temperature of 180°C and a mixing time of 10 min for the one‐step process with a rotor mixer. The optimum compounding conditions at 90 rpm were a temperature of 165°C and a mixing time of 10 min. Therefore, a short compounding time, appropriate mixing temperatures, and a moderate rotation speed improved the compounding quality of the modified blends and the dynamic mechanical properties of the resultant composites. The melt torque and blend temperature followed a polynomial relationship with the loading ratio of the wood fiber. The highest melt torque and blend temperature were obtained with 50% wood fiber. The coupling treatment was effective for improving the compatibility and adhesion at the interface. The two‐step process was better than the one‐step process because the coupling agents were more evenly distributed at the interface with the two‐step process. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 2570–2578, 2004 相似文献