贻贝黏附蛋白型聚氨酯黏合材料的制备

基于生物来源黏合材料贻贝黏附蛋白的结构、进行材料结构设计,经由扩链、偶联的分步合成,得到一种MAP型聚氨酯黏合材料。以热失重分析、细胞毒性实验进行该黏合材料的初步性能评价,结果表明,该黏合材料聚合分布均匀、黏均相对分子质量为955,表现出良好的热稳定性以及对体外活细胞的低毒性,黏合材料质量浓度为4 000μg/L时、对ECV304细胞的24 h增殖抑制作用低于30%,具有进一步应用于生物医学领域、进行快速黏合修复的良好前景。     

橡胶硫化黏合促进剂研制与开发进展

橡胶与金属是两种不同的材料,它们的化学结构和机械性能存在着很大的差别,但是橡胶通过硫化与金属黏合,却可以使橡胶的高弹性与金属的高强度结合起来,从而实现橡胶与金属材料黏合[1～2].本文描述了在橡胶金属复合材料特别是轮胎工业中子午线轮胎生产有关的橡胶黏合促进剂.并且简要叙述了橡胶硫化黏合促进剂的发展历程、概念和作用机理,...     

响应面优化Al3+配位改性天然高分子骨胶黏合材料的制备

采用Al³⁺配位改性天然高分子骨胶黏合材料,应用响应面优化法优化尿素用量、十二烷基硫酸钠(SDS)用量和配位反应温度3个因素对天然高分子骨胶黏合材料黏度和凝固点的影响。根据Box-Behnken实验设计原理,使用Design-Expert (V8.0.6.1)软件对实验进行设计与分析,以黏度和凝固点为响应量,建立响应量的回归模型,分析各因素的显著性与交互作用。结果表明最佳工艺条件为:m_尿素= 0.78g,m_SDS =0.5g,T_配位=60.56℃;响应量预测值为:凝固点4.2℃,黏度4.575Pa·s。     

多组分功能性保暖非织造材料的开发

将羊绒、木棉、远红外涤纶、ES纤维进行混合,经过3种不同的针刺密度和热风黏合工艺后,加工出相应的保暖絮片,对其面密度、厚度、保暖性、压缩回复率、拉伸强力、透气性、耐水洗性进行了测试分析,得出在针刺密度为10刺/m~2、热风黏合温度135℃、时间2 min的工艺条件下制备的保暖絮片具有最高保温率。     

新型山羊毛热黏合衬的开发

以山羊毛、涤纶、热熔纤维为原料,采用针刺-热轧等主要工艺,开发了面密度为150 g/m2、4种比例不同的黏合衬样品。测试了样品的厚度、透气性、强力、褶皱弹性、剥离强力、尺寸稳定性等。对照黏合衬的相关要求,探讨了山羊毛黏合衬布的可行性,认为山羊毛、涤纶、热熔纤维的质量比为60∶25∶15时,山羊毛黏合衬的各项性能较优,达到服用性能的要求,提升了山羊毛的使用价值。     

仿生材料多巴胺对橡胶/钢丝帘线黏合性能的影响

选用子午线轮胎胎体胶料配方作为基本配方,以钢丝帘线作为骨架材料,采用自行研发的橡胶与钢丝帘线动态黏合性能的测试方法,考察了多巴胺及传统黏合体系对橡胶/钢丝帘线动态黏合性能的影响,并探讨了多巴胺替代间苯二酚作为无毒环境友好型黏合剂的可行性。结果发现,钴盐黏合体系赋予了橡胶与钢丝帘线较好的动态黏合,多巴胺体系赋予了较好的静态黏合,间甲白体系居中,3种黏合体系并用可赋予最好的动、静态黏合性能。橡胶/钢丝帘线的动、静态黏合力均随着多巴胺用量的增加而增大,但在拉伸疲劳后出现下降。     

一步法替代热扩散电镀工艺对钢帘线性能影响

钢帘线生产中以一步法电镀工艺代替热扩散电镀，可节约中频热扩散损耗且无需磷化处理，进而减少工艺流程及生产成本。本文对两种工艺3+9结构帘线生产过程的相关性能进行对比分析。研究发现：一步法生产的钢丝镀层更为致密，镀层仅存在α相黄铜，与热扩散电镀的钢丝相比具有更好的延展性，进而使得拉拔过程中的镀层损耗更少，合股过程的断丝率更低，且其镀层内外组分基本均匀一致。一步法钢丝与热扩散钢丝相比具有更低的表面ZnO含量，其初始黏合力高于热扩散帘线约26.15%,3 d、7 d、14 d的93℃/95%RH的湿热老化黏合分别高于热扩散帘线11.49%、17.11%和4.35%，两种工艺帘线初始黏合或老化黏合覆胶率基本一致。     

黏合增进剂PM-18在输送带胶料中的应用

主要研究了黏合增进剂PM-18在输送带胶料中的应用。试验结果表明,在尼龙、聚酯带贴胶配方中加入15份PM-18,可提高布与布、胶与布间的黏合强度,满足此类输送带的使用要求;在钢丝绳芯输送带黏合胶配方中加入15份PM-18,可获得胶料与镀锌钢丝绳良好的初始黏合力和老化后的黏合力,远高于GB/T9770标准,能够满足钢丝带长期使用的要求。通过加入黏合增进剂PM-18,在满足输送带使用要求的同时,又可使配方成本得到大幅度降低。     

焦烧时间对钢丝-天然橡胶黏合性能的影响

探究了N-环己基硫代邻苯二甲酰亚胺(防焦剂CTP)用量对胶料物理性能、交联密度和黏合性能的影响.结果表明,随着防焦剂CTP用量的增加,焦烧时间和工艺正硫化时间逐渐延长,未添加黏合组分的胶料的交联密度有所升高,添加黏合组分的胶料交联密度呈先升后降的趋势.CTP用量对胶料的力学性能没有明显的影响,而压缩生热和黏合性能都与C...     

提高三角带线绳动态黏合性能的探讨

试验探讨一些提高三角带线绳动态黏合性能的测试:用模量高和动态黏合好及高质量稳定的线绳作为三角带的强力材料;配方设计要橡胶并用,加苯甲酸、SI69和抗硫化还原剂TDB680,用软化点高些的超级增粘树脂作为黏合剂;工艺管理控制上下功夫。     

Thermal oxidative degradation of bicomponent PP/PET fiber during thermal bonding process

The effects of the thermal bonding temperature, dwell time, and the type of mold materials on the thermal oxidative degradation of the PP sheath of bicomponent fibers were investigated using the Fourier Transform Infrared Spectra (FTIR) and Thermal Gravimetry/Differential Scanning Calorimetry (TG‐DSC) techniques. The samples were prepared on a new 3D nonwovens process based on air‐laying and through‐air thermal bonding. The fiber material was a commercial polypropylene (PP)/polyester (PET) (sheath/core) bicomponent staple fiber. The results reveal that ketone developed following β‐scission in the thermally bonded nonwovens. The level of thermal oxidative degradation increases with increase in the bonding temperature, dwell time, and the thermal conductivity of the mold material. Such thermal oxidative degradation led to the slight widening of the melting peaks of the fiber PP sheath in the thermally bonded nonwovens, and a slight decreasing of melting point compared with those of the as‐received fiber. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 391–397, 2007     

聚酯型HMA胶膜AS 615的性能研究

自制AS 615是一种新开发的特种聚酯型HMA(热熔胶)胶膜,具有良好的综合性能;以此作为电子产品塑料外壳/金属部件的胶粘剂,并对其应用性能进行了系统研究。结果表明:AS 615对ABS(丙烯腈-丁二烯-苯乙烯共聚物)、PC(聚碳酸酯)等极性塑料和金属具有良好的粘接性能,相应胶接件稳定后的剥离强度超过65 N/25 mm,其最佳粘接复合温度范围为120～160℃;AS 615具有良好的耐水性、耐老化性和粘接持久性,可取代国外同类产品用于电子行业中极性聚合物与金属之间的粘接。     

聚酯帘子线与橡胶粘合的研究进展

探讨了浸胶液在聚酯帘子线与橡胶之间的作用机理以及增粘作用。总结了聚酯一浴、二浴浸胶液、纺丝后加工浸胶处理、等离子体及共聚改性、纺丝技术的发展等对提高聚酯与橡胶粘接强度的影响。     

机箱托架导轨胶膜粘接新工艺技术

对机箱托架导轨的材料选用聚四氟乙烯软带,粘接采用胶膜粘接工艺进行了全面研究,确定了胶膜粘接热压工艺参数:热压温度130~140℃,时间15~20min,压力3~4kg/cm2。对胶膜粘接工艺(新工艺)和胶黏剂粘接工艺(老工艺)进行了比较,结果表明:选用的胶膜粘接工艺参数合理,在最佳工艺参数条件下,胶膜粘接的剥离强度是胶黏剂粘接强度的1.5倍以上,工艺周期同胶黏剂粘接周期相比,缩短了70%以上,满足机箱托架导轨粘接要求,因此胶膜粘接工艺是托架导轨粘接首选。     

Thermally bonded nonwoven filters composed of bicomponent polypropylene/polyester fiber. I. Statistical approach for minimizing the pore size

A statistical approach involving the uniform design of experiments and regression analysis is used to investigate the effects of thermal bonding process parameters, dwell time, thermal bonding temperature, and hot air velocity, on the pore size of three‐dimensional (3D) nonwoven filters. These filters are produced from polypropylene (PP)/polyester (PET) (sheath/core) bicomponent staple fibers. The pore structures of the filter samples were examined using the capillary flow porometer. Results reveal that the statistical approach is effective in identifying the effects of the investigated process parameters on both the bubble point pore diameter and the mean flow pore diameter for the thermally bonded nonwoven filter samples. Under the optimized processing parameters for achieving the minimized pore size, the predicted minimum bubble point pore diameter is 111.12 μm and the predicted minimum mean flow pore diameter is 63.4 μm for the filter sample with the area density of 60 g/m². They are in good agreement with the experimental values of 111.71 and 60.91 μm, respectively. Microstructure features observed using scanning electron microscope indicate that the effects of the investigated process parameters on the pore size are closely related to the thermal energy delivered to the fibers and the pressure drop acting on the fabrics. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 2689–2699, 2006     

聚氨酯弹性体与金属粘接的研究

以浇注型聚酯或聚醚聚氨酯弹性体为柔性材料,铁或铝金属为刚性材料,采用5种粘合剂,进行了粘接实验。实验数据表明,聚氨酯弹性体硬度较高时,柔性材料与金属粘接的剥离强度最高可达31 kN/m,聚酯型聚氨酯弹性体与金属粘接比聚醚型聚氨酯弹性体的粘接性能好。     

Review of thermally point‐bonded nonwovens: Materials,processes, and properties

Recent research on all aspects of thermally point‐bonded nonwovens has led to considerable improvements in the understanding of material requirements for these nonwovens, the changes that occur during bonding, and the mechanical properties of the resultant nonwoven materials. This article will review (1) how the thermal bonding process transforms the material properties of feed fibers, (2) the implications for material selection, and (3) the resultant failure properties of the bonded nonwoven. The formation of a bond during thermal bonding follows in sequence through three critical steps: (1) heating the web to partially melt the crystalline region, (2) reptation of the newly released chain segments across the fiber–fiber interface, and (3) subsequent cooling of the web to re‐solidify it and to trap the chain segments that diffused across the fiber–fiber interface. The time scales for these processes closely match commercial practice. In addition, adequate pressure is required to compress the fibers that form the bond spots and enhance heat transfer to these fibers. However, pressures typically used in commercial practice are insufficient to increase the melting temperature significantly or to produce significant heating due to compression of the fibers. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006     

1.67dtex有光正三角形涤纶短纤维纺丝工艺探讨

采用特性黏数为0.677 dL/g的有光聚酯切片熔融纺丝生产正三角形涤纶短纤维,探讨了切片干燥、纺丝成形、拉伸、热定型等对生产及纤维性能的影响。结果表明:控制聚酯切片含水率小于28μg/g,纺丝温度282～286℃,纺丝速度930～950 m/min,拉伸温度60～70℃,总拉伸倍数3.50～3.65,生产稳定,得到的1.67 dtex有光正三角形涤纶短纤维截面清晰,异形度为55.1%,断裂强度为5.09 cN/dtex,断裂伸长率为28.5%,180℃干热收缩率为8.4%。     

Use of wet‐laid techniques to form flax‐polypropylene nonwovens as base substrates for eco‐friendly composites by using hot‐press molding

The wet‐laid process with flax (base) and polypropylene (binder) fibers has been used to obtain nonwovens for further processing by hot‐press molding. Mechanical characterization of nonwovens has revealed that slight anisotropy is obtained with the wet‐laid process as better tensile strength is obtained in the preferential deposition direction. The thermo‐bonding process provides good cohesion to nonwovens, which is critical for further handling/shaping by hot‐press molding. Flax:PP composites have been processed by stacking eight individual flax:PP nonwoven sheets and applying moderate temperature and pressure. As the amount of binder fiber is relatively low (<30 wt%) if compared with similar systems processed by extrusion and injection molding, it is possible to obtain eco‐friendly composites as the total content on natural fiber (flax) is higher than 70 wt%. Mechanical characterization of hot‐pressed flax:PP composites has revealed high dependency of tensile and flexural strength on the total amount of binder fiber as this component is responsible for flax fiber embedment which is a critical parameter to ensure good fiber–matrix interaction. Combination of wet‐laid techniques with hot‐press molding processes is interesting from both technical and environmental points of view as high natural fiber content composites with balanced properties can be obtained. POLYM. COMPOS., 2012. © 2011 Society of Plastics Engineers