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从油箱喷塑固化工艺条件出发,以环氧树脂(EP)和小分子聚酰胺为主要原料,制备了两种不同配方的汽车油箱用点焊密封胶。测试了点焊胶在90#汽油和0#柴油中的耐油性和粘接强度,并对三种不同连接接头(胶接、点焊、胶焊)的粘接强度进行了对比和分析。结果表明:点焊胶的固化工艺与汽车镀锌板类油箱表面漆层的固化工艺相同,故不必增加点焊胶的固化设备和工序;两种点焊胶具有较好的粘接性能,其T型剥离强度分别为89.0kN/m和92.0kN/m,拉伸剪切强度分别为13.3MPa和12.9MPa;两种点焊胶在90#汽油和0#柴油中浸泡360d后,试样的粘接强度降幅不明显,说明其具有一定程度的耐油性;将两种点焊胶用于汽车油箱的密封中,既具有良好的粘接密封性能,又解决了镀锌板类油箱渗漏油等问题。  相似文献   
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In this study, sprayable strain-hardening fiber-reinforced cementitious composites (FRCC) were applied to strengthen the concrete slabs in a concrete-face rockfill dam (CFRD) for the first time. Experimental, numerical, and analytical investigations were carried out to understand the flexural properties of FRCC-layered concrete slabs. It was found that the FRCC layer improved the flexural performance of concrete slabs significantly. The cracking and ultimate loads of a concrete slab with an 80 mm FRCC layer were 132% and 69% higher than those of the unstrengthened concrete slab, respectively. At the maximum crack width of 0.2 mm, the deflection of the 80-mm FRCC strengthened concrete slab was 144% higher than that of the unstrengthened concrete slab. In addition, a FE model and a simplified analytical method were developed for the design and analysis of FRCC-layered concrete slabs. Finally, the test result of FRCC leaching solution indicated that the quality of the water surrounding FRCC satisfied the standard for drinking water. The findings of this study indicate that the sprayable strain-hardening FRCC has a good potential for strengthening hydraulic structures such as CFRDs.  相似文献   
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无三苯溶剂型氯丁喷胶的研究   总被引:2,自引:1,他引:1  
陈辉 《中国胶粘剂》2002,11(3):25-27
制备了无三苯 (苯、甲苯、二甲苯 )溶剂型氯丁喷胶 ,研究了混合溶剂组成、氯丁橡胶品种、及增粘树脂类型对氯丁喷胶性能的影响  相似文献   
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使用喷射超高韧性水泥基复合材料(Ultra High Toughness Cementitious Composites,UHTCC)加固和修补水工混凝土结构具有广阔的应用前景。为评估加固效果,采用喷射UHTCC和既有混凝土制备成的两端无切口剪切型断裂复合试件,开展单边加载剪切型断裂试验,测试两种材料的界面剪切型断裂韧度。对既有混凝土表面分别采用高压水枪冲洗、人工凿毛和涂抹界面剂三种不同的处理方法,并对比研究喷射UHTCC和浇筑UHTCC两种施工工艺,探究不同因素对复合试件界面剪切型断裂韧度的影响。试验结果表明:喷射UHTCC与既有混凝土之间黏结性能良好;界面粗糙度对界面剪切型断裂韧度无显著影响;涂抹界面剂会使界面剪切型断裂韧度显著下降;喷射UHTCC制备的复合试件其界面剪切型断裂韧度高于浇筑UHTCC制备的复合试件。喷射UHTCC技术可对水工混凝土结构进行有效的加固和修复。  相似文献   
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Plasma spraying is one of the potential manufacturing technologies widely used in tubular solid oxide fuel cells (SOFC) fabrication. The plasma spray technology requires powders with good flowability and large particle size (5-200 μm). A simple, low temperature assisted chemical process was used for the preparation of plasma grade yttria stabilized zirconia powder without any agglomeration process. The powder was characterized by X-ray diffractometry, particle size analysis, scanning electron microscopy and Raman spectroscopy. The powder exhibited cubic phase, good flowability and blocky angular shape. The 8YSZ powder was plasma sprayed and the coatings after sintering showed gas tightness (gas leak rate ∼ 1 × 10−6 mbar l s−1 cm2). This was substantiated by the presence of densely packed grains as seen in the surface FESEM image of the sintered plasma sprayed 8YSZ free form. Conductivity values in par with the values reported in literature were obtained for plasma sprayed 8YSZ coating.  相似文献   
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采用造纸黑液水解废弃牛毛制备牛毛角蛋白水解液,并与聚乙烯醇(PVA)、聚丙烯酰胺(PAM)、N,N-亚甲基双丙烯酰胺(MBA)和丙三醇(GL)共混反应制备可降解的液体喷施地膜。通过FT-IR、TG-DTG和XRD表征说明共混反应形成了三维网络结构的大分子共聚物,喷施后形成的MKSF(Modified keratin-based sprayable mulch film)也具有良好的稳定性;MKSF喷施后相比对照组7 d土壤保水率提高21.30%;降解试验表明在50 d内可降解23.07%,对小麦种子的生根发芽和生长发育试验表明喷施液体地膜组的小麦鲜质量平均比对照组高36%,干质量平均高75%,根长平均为9.98 cm,躯干平均长为16.00 cm,有良好的生长促进作用,EDS检测MKSF含有植物生长的必要元素N、P、K,中量元素S、C a等,降解后可为农作物的生长提供养分。MKSF具有良好的吸水性、保水性和可降解性。  相似文献   
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对于喷雾液滴的形成,以及他们之间的相互碰撞,黏合的基本原理,以表面活性剂和聚合物带来的影响作为重点加以描述。其中最值得注意的是动力学的吸附过程和其对乳化液滴形成的影响。其次,描述降低飘移的意义。大分子聚合物减少小尺寸液滴数量的作用,可以解释为聚合物分子链卷曲交迭从而使溶液的黏度大幅度增加。讨论了保证喷雾乳液的长期物理稳定性的原理,所使用的乳化剂必须能防止乳液的絮凝和聚结。所加入的高分子量的聚合物,通过低剪切应力或剪切速率时提高黏度和产生塑变值,来有效降低或消除膏化或沉降现象。给出了一组有效的乳化剂/增稠剂体系所制备的喷雾配方实例。这个混合物包含非离子表面活性剂和两种聚合物(甘露聚糖和黄原胶)。混合的乳化剂通过空间稳定作用,来防止絮凝和聚结。低浓度的甘露聚糖/黄原胶混合物,在低剪切应力或剪切速率时可以产生高黏度值。由于使用这种乳化剂/增稠剂混合物制备的喷雾乳液液滴尺寸将大于100μM,因此可以避免漂移。这和一些市售的喷雾产品不同,那些产品的乳液液滴尺寸在54μM的区域内,导致漂移非常明显。使用这个乳化剂/增稠剂体系的喷雾配方,显示出快速的弹性回复,并给与产品很好的肤感和涂布。  相似文献   
9.
Hydrogels have three-dimensional network structures that have been widely applied owing to their high water content, excellent biocompatibility, and physicochemical properties. Compared with conventional hydrogels, sprayable hydrogels exhibit excellent temporal and spatial controllability. Biomass materials offer easy accessibility, biocompatibility, biodegradability, and other physicochemical properties that are extensively used in the formation of sprayable hydrogels. In situ formed biomass-based sprayable hydrogels are realized by chemical or physical crosslinking. Rapid spray filming, in situ drug delivery, high permeability, and flexible portability enable biomass-based sprayable hydrogels to show great potential for topical drug delivery, wound healing, and other applications. This review describes in detail the status of research on the preparation and application of biomass-based sprayable hydrogels and suggests prospects for their future development.  相似文献   
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