共查询到20条相似文献,搜索用时 296 毫秒
1.
2.
3.
研究了玻化微珠在隔热保温厚质腻子中的最佳、最大质量比,以及抗裂纤维、可再分散胶粉对隔热保温厚质腻子粘接强度的影响。重点研究了不同比例的玻化微珠改性剂对隔热保温厚质腻子的粘接强度的影响。结果表明:采取将不同粒径玻化微珠合理复配的方法,可以获得最大的体积密度、最低的容重、最低的导热系数。使用抗裂纤维、可再分散胶粉虽然可以提高粘接强度,但是提高幅度有限,不能满足产品技术要求。采用玻化微珠改性剂对玻化微珠表面进行改性,可以大幅度提高隔热保温厚质腻子的粘接强度,达到0.065 MPa,使腻子满足厚质涂装的要求。 相似文献
4.
5.
6.
7.
《涂料工业》2016,(3)
利用阳离子疏水剂对硅酸镁铝(MS)进行改性,再复合SiO_2气凝胶制备高效内墙干粉保温腻子。采用X射线衍射(XRD)、比表面积(BET)、Zeta电位对改性MS进行了表征,用保温温差及导热系数对腻子进行了保温性能评价。结果显示,改性MS的XRD衍射峰2θ、比表面积及孔容都减小,表观孔径和Zeta电位增大,表明疏水改性剂可能以多种方式进入MS层间及吸附在其表面,造成MS层间及表面微孔封闭;所得MS腻子抗开裂性得到了改善,保温效果提高;改性MS再复合SiO_2气凝胶所得保温腻子,保温性能得到了进一步提高,其试板较原试板保温温差增加了5.2℃,导热系数小至0.042 W/(m·K)。 相似文献
9.
10.
11.
随着计算机在化工领域中越来越广泛的应用,培养化工专业尤其是独立学院化工专业学生的计算机应用能力迫在眉睫。我系通过将原有的课程进行调整优化,并增设一系列计算机应用课程,同时与周边化工企业建立产学研合作平台,建立起一套贯穿计算机应用的系列课程,将计算机应用内容融入了学生整个四年的学习过程,从而逐步提高了学生应用计算机技术的能力。 相似文献
12.
13.
石化企业企业资源计划实施策略分析 总被引:1,自引:0,他引:1
介绍了石化企业企业资源计划(ERP)实施特点,并对ERP实施策略进行了分析,最后就如何在石化企业中实施好ERP提出了自己的建议。 相似文献
14.
15.
概述了国内外水性涂料的发展、应用概况。介绍了水性涂料的施工设备、施工条件和施工实例。认为在水性涂料推广应用的同时,对涂料价格、施工工艺、设备投资等方面应有创新和突破。 相似文献
16.
17.
The aim of this study was to evaluate the microtensile bond strength of two all-in-one self-etch adhesives applied to sound and caries-affected dentin with four different application techniques. Forty extracted third molars with occlusal caries were randomly divided into four groups for G-Aenial Bond and S3 Bond: (1) according to manufacturer's instructions; (2) with acid etching before applying adhesives; (3) doubling adhesive application time; and (4) doubling adhesive coating. Teeth were sectioned to obtain 1-mm- ± 0.2-mm-thick dentin sticks and subjected to a tensile force. For G-Aenial Bond, doubling the time and application of two consecutive coats produced significantly higher strength than that obtained by following manufacturers' instructions and acid etching application to sound dentin. Prior acid etching and application of two consecutive coats to caries-affected dentin generated significantly higher bond strength than that using other techniques. For S3 Bond, there was no significant difference between application techniques in caries-affected dentin. For sound dentin, double-time application of S3 Bond produced significantly higher strength than application according to the manufacturers' instructions. Compared to the application according to manufacturer's instructions, acid etching before applying adhesives, doubling application time, and doubling the coating had a positive effect on bond strength to caries-affected dentin for all-in-one adhesives. 相似文献
18.
Two successive applications of urea and ammonium sulphate (AS) at varying intervals were given in two soils, one of which was salt affected. The nitrification and nitrate leaching after both the applications of fertilizers was studied. The nitrification of first application of AS was faster than urea on both soils. However, the nitrification rate of both fertilizers was slow in salt effected soil. The same trend of results was observed with second application of fertilizers. However, the nitrification of second application given within 6 weeks of the first application proceeded at a much faster rate than that of the first application. The amount of NO
3
-
that moved down with periodic water application was related with nitrification rate and the amount of fertilizer nitrified at the time of water application. 相似文献
19.
20.
简要介绍了环糊精化学的产生、发展、性能、应用及结构特征。详细介绍了:新型环糊精衍生物的制备及在医药学中的应用;环糊精超分子作用力的自愈合杂化功能材料的制备及应用;环糊精自组装及主客体识别在分析分离科学中的应用。并对环糊精化学的发展进行了展望。 相似文献