共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
3.
4.
本研究在室温条件下,以玉米淀粉为原料,以次氯酸钠为氧化剂,制备氧化淀粉粘合剂。通过测定粘合剂粘度、初粘力、剥离强度、干燥时间,分析配方中氧化剂次氯酸钠用量对粘合剂性能的影响,寻求最佳次氯酸钠用量以达到较好的性能。粘度是氧化淀粉胶粘剂的主要性能指标,它直接影响纸板的生产质量,而影响粘度的因素主要有氧化剂用量、氧化时间、固含量、氢氧化钠用量、氧化温度等。制备氧化淀粉胶粘剂比较适宜的条件为:氧化剂用量(以淀粉重量%计)20%,在此条件下,固体含量达到16.75%;初粘力达到最大,拉毛面积为99%。 相似文献
5.
6.
聚乙烯醇缩丁醛胶粘剂的制备 总被引:1,自引:0,他引:1
以聚乙烯醇(PVA)与正丁醛的质量比、反应体系的pH值、反应温度以及保温时间等作为制备聚乙烯醇缩丁醛(PVB)及其胶粘剂的主要因素,通过测定PVB的缩丁醛基含量、PVB胶粘剂的某些性能(如持粘力、黏度和固含量等)优选出制备PVB胶粘剂的最佳工艺条件。结果表明:当m(PVA)∶m(正丁醛)=100∶70、反应体系的pH值为2.0、反应温度为85℃、保温时间为3 h以及正丁醛的滴加速率为20~30滴/min时,PVB的缩醛度较高且形态较好,PVB胶粘剂的持粘力、黏度和固含量等指标均相对较高。 相似文献
7.
乔京洲 《精细与专用化学品》2000,8(18):34
由广西健成精细化工有限公司研制的低温快固自交联型涂料印花胶粘剂已通过鉴定,并将批量生产投放市场.该胶粘剂属第五代节能型涂料印花胶粘剂,具有焙烘温度低、时间短以及自交联和印花织物性能优良等特点.其原料是丙烯酸酯和低温高活性单体,经种子乳液聚合制备.该粘合剂外观为乳白色半透明液体,粘度≤0.2Pa·s(25±1℃),固含量30.0±2%,成膜物色泽为五色透明.采用此种胶粘剂可减少传统印染工艺生产工序.经检索,本产品达到和部分超过德国Hoechst公司Imperon 760 Binder产品性能指标. 相似文献
8.
9.
10.
11.
Mechanical and barrier properties of cardboard and 3D packaging coated with microfibrillated cellulose
下载免费PDF全文
![点击此处可从《应用聚合物科学杂志》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Microfibrillated cellulose (MFC) is increasingly used with cellulosic substrates and especially with paper materials. Its use with cardboard remains not reported and the study of mechanical and barrier properties of MFC‐coated cardboard has been investigated in this article. The influence of coating process as well as the effect of MFC have been highlighted by comparing different MFC‐coated cardboard samples with PE‐coated cardboard samples. MFC was coated using bar coating process. Their distribution and homogeneity onto cardboard was observed using techniques such as SEM and FE‐SEM. Tests such as oxygen and air permeability, bending stiffness, and compressive strength have been carried out. The coating process used impacts significantly cardboard properties by two opposite ways: on one hand it damages the structure cohesion of cardboard decreasing its compressive strength; on the other hand it increases its bending stiffness by increasing considerably the samples thickness. The addition of MFC counterbalances the negative effects of the coating process: bending stiffness and compressive strength are indeed improved by 30% in machine direction. On the contrary, MFC does not enhance much cardboard barrier properties, although it considerably increases their water absorption. Within a framework of packaging application, MFC will rather have consequent effects on cardboard's properties as blend or as part of the multilayer structure. Other applications have to be considered for its use as top layer. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40106. 相似文献
12.
Amaury Taboada-Rodríguez Isabel García-García Rita Cava-Roda Antonio López-Gómez Fulgencio Marín-Iniesta 《Journal of Coatings Technology and Research》2013,10(5):749-755
The corrugated cardboard used in food packaging readily absorbs moisture from the environment, especially when stored under high humidity conditions. In this research, the water barrier of cardboard was modified by changing the wettability of the cardboard surface, applying hydrophobic coatings of polylactic acid (PLA), alone or in combination with other substances that absorb gases (ethylene scavengers) such as clinoptilolite (C), sepiolite (S), and sepiolite permanganate (SP). The water barrier properties tested as water vapor permeability (WVP), water absorptiveness (WA), and water drop contact angle (CA) showed that the water resistance of the resulting cardboard was improved by the coating. The best results of these properties were obtained by using a coating of PLA 2% alone. In addition, PLA 2% with C 1.5% also showed good results, but the WA results were higher. The use of PLA coating produces a greater uniformity and smoothness of the coated cardboard surface due to the best filling of the pores or spaces between cellulose fibers. Our findings and the environmentally friendly nature of PLA strengthen the advantages of using these kinds of coatings on cardboard trays for the packaging, storage, and transport of foods such as fresh fruit and vegetables. 相似文献
13.
14.
This study aims to analyse the importance of gypsum plasterboard cardboard for fire resistance. A new hypothesis considering the failure based on the cardboard degradation is defined. This hypothesis comes from the thermal analysis of gypsum and cardboard performed in the simultaneous thermal analysis apparatus. Simultaneous thermal analysis results also allow defining the dehydration process of the gypsum. A numerical model that considers gypsum dehydration and the failure hypothesis has been developed by using Fire Dynamic Simulator. This numerical model is validated against 6 fire resistance tests. Results show that we can appropriately tune the numerical model (for predicting time to failure) based on the thermal properties of cardboard. 相似文献
15.
饮水途径是人体健康影响的重要途径之一.计算了济南市成人、青少年和幼儿的饮用水源地饮用水中污染物所致的平均个人年健康风险.计算结果表明:饮用水质引起的成人、青少年、幼儿和总健康风险方面来分别为1.21×10-4、1.28×10-4和1.39×10-4均高于国际防辐射委员会的最大可接受风险5.0×10-5和美国环保署规定的最高限制1.0×10-4风险级别;不确定性风险分析表明,成人、儿童和青少年的健康风险范围分别为(0.50×10-4,1.44×10-4)、(1.10×10-4,1.51×10-4)和(0.99×10-4,2.15×10-4),大多高于两权威机构推荐限制,说明该区域居民的饮用水健康风险非常值得关注. 相似文献
16.
Fabriano paper and cardboard are commonly used for oil paintings as paper supports. There are different practices for oil painting. Sometimes, painters paint directly on paper supports. They may also impregnate paper supports with linseed oil before painting to prevent the absorption of the binder from the oil‐based paint by the paper, or they may apply a background (e.g., animal glue and calcium carbonate) on the paper supports and then paint their drawings. The effects of aging by heat or ultraviolet light on the mechanical properties (tensile strength, tensile elongation, and tearing resistance), optical properties (changes in color indices), and pH of Fabriano paper and cardboard painted with the aforementioned practices were studied. In addition, the thermal stability of paper painted with these practices was studied with thermogravimetric analysis. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献
17.
糖组学的研究已经成为后基因时代一个重要的研究领域.糖类物质与凝集素之间的特异性相互作用,能够用于制备糖生物传感器,文章设计了一种简便的D-甘露糖电化学阻抗生物传感器,以刀豆凝集素为分子识别物质,静电吸附法将刀豆凝集素固定到金圆盘电极的表面,用电化学阻抗法进行检测.实验结果表明,以[Fe(CN)6]3-4-氧化还原电对作为探针,电子转移阻抗变化值与D-甘露糖浓度的对数在5.0×10-8~1.0×10-5 mol/L之间呈良好的线性关系,检出限为0.02μmol/L. 相似文献
18.
新型瓦楞纸增强剂的制备及应用 总被引:2,自引:0,他引:2
以阳离子淀粉为主体,考察添加水性环氧树脂和交联剂后对瓦楞纸性能的影响,优化配比及添加量,制备出新型瓦楞纸增强剂,并对其进行应用研究。研究结果表明:质量分数1%的阳离子淀粉溶液和质量分数1%的水性环氧树脂溶液在m(CS):m(E-44)=10:1条件下复配,再添加占其总质量分数8%的咪唑溶液(质量分数0.1%),得到较优新型瓦楞纸增强剂(固含量为1%)。添加占湿浆(含绝干纸浆25%)质量分数为50%的新型瓦楞纸增强剂,抄纸后得到纸张的环亚强度为348N/m(较空白231N/m提高50.6%)、耐折强度47次(较空白12次提高291.6%)、拉力83.5N(较空白48.5N提高72.2%)。 相似文献
19.
在平板显示器用偏光片领域,与传统的TAC薄膜相比,亚克力薄膜透明、耐候、化学稳定性高.另外,亚克力薄膜具与TAC薄膜相似的光学补偿功能;其抗拉伸、抗弯曲、抗压缩的能力均高于TAC薄膜;生产过程中不需要使用二氯甲烷,更加环保;近2年来,亚克力薄膜替代TAC薄膜使用的速度加快. 相似文献
20.
Surface properties of a polymeric coating system have a strong influence on its performance and service life. However, the surface of a polymer coating may have different chemical, physical, and mechanical properties from the bulk. Significant progress has been made during the last three decades in the improvement of coating on materials. It has been established that polymeric blends have great potential in replacing economically many conventional materials because of their high specific strength. It is needed today, constantly, to improve the surface finish of any material for efficiency and shiny appearance in the severity of working environment. In packaging, materials having longer service lives and those are less corrosive are highly used. The effect of polymer based coating on the paper material improves its mechanical properties and flame resistance. Effect of flame retardant polymer coating illuminates the surface of the sheet. Important application of the material sheets will be for corrosion receptivity and humidity resistance of this material will certainly improve. Blends of PMM/PVDF are mainly used to improve piezoelectric properties of PVDF. In the present study we report the measurement of surface properties of thin layer of polymer blend coated on the cardboard sheet substrate material. Polymer blend solutions of PMMA/PVDF was prepared at 90/10 (w/w) proportions in miscible solvent of toluene and DMF. Thin film was prepared on the surface of cardboard by dipping the cardboard material in the solution. Thickness of the dried polymer coated paper sheet was measured to see uniformity of coating and for different concentrations. Surface properties such as flexibility index, yellowness, and gloss reflectance were also measured. The study on these polymer coated paper will help in improving the surface property of paper as well as its use in packaging. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 4167–4171, 2006 相似文献