儿童贴纸书抗弯曲性能影响因素研究

通过合成丙烯酸酯压敏标签胶,研究胶黏剂玻璃化温度(Tg)和功能单体丙烯酸的用量以及不同面材和底材的吸水性、储存环境对儿童贴纸书抗弯曲性能的影响。结果表明,底材吸水量在29.5 g/m~2左右时,使用纸张纤维致密的铜版纸制备的贴纸书抗弯曲性能较好;面材和胶黏剂对抗弯曲性能影响不明显;此外,研究发现后放置环境条件选用温度(23±3)℃,湿度50%±5%的标准条件下,儿童贴纸书的弯曲变形度最小。     

水性裱书胶用保湿剂对儿童卡书弯曲度的影响研究

采用不同的保湿剂制备水性裱书胶,研究保湿剂的类型、用量对卡书弯曲度的影响,结果表明:添加保湿剂能明显增加水性胶粘剂的开放时间;一定量的保湿剂能降低卡书的弯曲度,二甘醇作为粘合剂保湿剂制作的卡书弯曲度最小;存放环境湿度的增加和纸张克数的减少卡书弯曲度变小。     

木材用玉米淀粉胶粘剂的改性研究

以玉米淀粉为原料、次氯酸钠为淀粉的氧化剂和过硫酸铵(APS)为聚乙烯醇(PVA)的氧化剂,在碱性条件下将氧化玉米淀粉与氧化PVA进行接枝改性,制备出-种木材用胶粘剂。考察了PVA浓度、纳米蒙脱土(MMT)含量和固含量等对淀粉胶粘剂干、湿态胶接强度的影响。结果表明:当固含量为28.57%、u(PVA)=5%和w(纳米MMT)=2%时,相应淀粉胶粘剂的综合性能相对最好。     

次氯酸钠用量对高强度淀粉胶粘剂性能的影响

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%。     

纤维素纳米晶体改性淀粉胶粘剂的研究

采用硫酸水解MCC(微晶纤维素)制备了CNC(纤维素纳米晶体),并以此作为氧化淀粉胶粘剂的改性剂,着重探讨了CNC用量对该胶粘剂固含量、黏度和剪切强度等影响。研究结果表明:CNC有较大的长径比,并且仍具有纤维素的基本化学结构;当w(CNC)=15%(相对于淀粉胶粘剂质量而言)时,胶粘剂的固含量(为69.841%)和黏度(为3 900 m Pa·s)相对最大;当w(CNC)=20%时,胶粘剂的综合性能相对最好,并且剪切强度(为1.93 MPa)相对最大。     

聚乙烯醇缩丁醛胶粘剂的制备

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。     

高固含量水基热熔胶的研制

以丙烯酸酯、醋酸乙烯酯等为原料,通过种子半连续法制备出稳定的高固含量共聚乳液,然后加入增粘树脂制得了高固含量水基热熔胶.探讨了丙烯酸酯共聚物的玻璃化转变温度、粘接温度、胶粘剂的黏度、固含量及增粘树脂的用量对胶接强度的影响规律.研究发现,当共聚物的玻璃化转变温度为5℃、粘接温度为90℃、共聚乳胶的固含量为60%~70%、增粘剂用量为50%时,热熔胶的粘接性能最好.     

低温快固自交联型涂料印花胶粘剂

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.     

改性花生粕基标签胶粘剂的制备工艺研究

以异氰酸酯(MDI)为交联剂,改性花生粕制备标签胶粘剂,研究了交联剂添加量、料液比、反应温度和反应时间对花生粕基标签胶粘剂性能的影响规律。研究结果表明:标签胶的最佳制备工艺条件为,交联剂添加量15%、料液比1∶5、反应温度50℃和反应时间1.0 h。此条件下标签胶的综合性能(黏度为82.22 Pa·s,粘接强度为1.14 MPa,固含量为18.59%,耐水时间77 h)相对较好,应用于啤酒标签具有较高的粘接强度和耐水性能。     

3D打印氧化硅陶瓷的制备及性能研究

随着陶瓷3D打印技术的发展,3D打印高性能陶瓷越来越受关注,在航空航天领域得到快速应用.通过研究分散剂、浆料pH、氧化硅粉体粒径和固相含量对浆料粘度和流动性的影响,可制备出粘度低、固相含量高、流动性好的陶瓷浆料.测试了不同固相含量对SiO2陶瓷的弯曲强度、烧成收缩率、气孔率和致密度的影响.结果表明:在68vol%的固相含量条件下,烧结后SiO2陶瓷的致密度达到74.32%,烧成收缩率为0.95%.     

Mechanical and barrier properties of cardboard and 3D packaging coated with microfibrillated cellulose

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.     

Hydrophobic properties of cardboard coated with polylactic acid and ethylene scavengers

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.     

无机填料对淀粉胶性能的影响

以斯坦霍尔2步法制备的玉米淀粉胶为研究对象,试验了3种无机填料对淀粉胶稳定性、黏度以及制备的瓦楞纸板在普通环境和潮湿环境中的边压强度和粘合强度的影响。结果表明,加入无机填料可以大幅度提高淀粉胶稳定性;以加入适当无机填料A的淀粉胶制作的瓦楞纸板的边压强度有较大提高。     

Gypsum board failure model based on cardboard behaviour

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.     

湖库型饮用水源地环境健康风险及不确定性分析

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.     

Artificial aging and deterioration of oil‐painted Fabriano paper and cardboard paper supports

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     

基于静电结合的电化学阻抗D-甘露糖生物传感器的研究

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.     

新型瓦楞纸增强剂的制备及应用

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％）。     

Studies on surface properties of polymeric coated paper material

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     

亚克力替代TAC的现状与未来

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.