“一步法”合成改性纳米碳酸钙及表征

通过直接沉淀法、微乳液法和水热法合成并改性了纳米CaCO3。3种方法均有表面活性剂的介入,目的在于表面活性剂在控制碳酸钙晶粒生长的同时可使纳米CaCO3表面得到改性。采用X射线衍射(XRD)、红外光谱(FTIR)、透射电镜(TEM)等分析测试方法对产物的物相、形貌及颗粒大小进行表征。结果表明,采用水热法在十二烷基磺酸钠(SDS)和EDTA共同作用下得到粒径为20~50 nm的方解石型纳米CaCO3,通过表面活性剂与纳米CaCO3表面的化学吸附实现表面改性的目的。     

Role of sand on curing of partex surface by UV radiation

A partex surface was modified by a UV‐curing system with epoxy acrylate (EB‐600). A set of formulations was prepared with oligomer and the trifunctional monomer trimethylol propane triacrylate in different combinations of percentages (1–5%) of sand to study the role of sand in various physical properties of UV‐cured thin films, as well as partex surfaces. Increased pendulum hardness (PH), gloss, adhesion, and abrasion values were obtained by the addition of sand into the partex surfaces. The best results were obtained with the formulation containing 3% sand. An enhanced PH and a decreased percentage of gel content of the UV‐cured film was observed with an increase of the sand concentration. A simulated weathering test was performed with partex surfaces cured by a formulation containing 3% sand in the base coat. The losses of the physical properties were found to be lower over the surface treated with the formulation containing sand. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2385–2392, 2002     

Effect of fillers on curing of wood surfaces with polyester oligomers by ultraviolet radiation

A set of formulations was prepared with polyester acrylate (oligoester M‐9050) oligomers in combination with reactive diluents of different functionalities such as ethylhexyl acrylate, tripropylene glycol diacrylate , and trimethylol propane triacrylate (TMPTA). The thin films were prepared with these formulated solutions under UV radiation on a glass plate, and their physical properties such as pendulum hardness and gel content were studied. The formulation containing TMPTA showed the greatest pendulum hardness and gel content. The polished wood surfaces were cured with these formulated solutions. Physical properties such as pendulum hardness gloss at 20° and 60° angles, adhesion, abrasion resistance, and scratch hardness of UV‐cured surfaces of the wood were characterized. The formulation containing TMPTA had the best physical properties. Two types of filler, sand and talc, were used in the base coat to obtain these better properties. Both fillers improved the properties; however, the 1% sand– and 4% talc–containing formulations performed better. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3826–3834, 2003     

纳米CaCO_3的表面改性及其在软PVC中的应用

本文合成了系列表面改性剂ADDP ,并将其用于改性纳米CaCO3。研究了表面改性后纳米CaCO3 的性质及其随ADDP分子结构和用量的变化规律。最后 ,将改性纳米CaCO3 充填改性软质PVC。     

铝酸酯偶联剂改性纳米碳酸钙效果研究

研究了铝酸酯偶联剂对纳米碳酸钙湿法表面改性的工艺过程,通过沉降速度表征确定了最佳改性条件,通过BET和吸油值等表面物化性能评价了纳米碳酸钙的改性效果．同时将粉体添加到有机硅密封胶中测定对流变性能的影响。实验结果表明：改性纳米碳酸钙粉体表面性质发生了明显的变化．比表面积增大．亲油性和在有机相中的分散性明显提高,增强了有机硅密封胶的流变性能。     

亚微米重质碳酸钙的表面改性研究

采用自制偶联剂S为主要处理剂对亚微米重质碳酸钙（CaCO3）表面进行活化处理。用IR、XRD、TEM等不同手段验证了此方法改性的碳酸钙降低了表面能,颗粒的团聚结合力减弱,呈明显的疏水性,从而使碳酸钙颗粒在塑料加工过程中迅速而均匀地分散到基体之中,表现了较优的填充性能,达到对材料改性的作用。     

硅烷偶联剂改性碳酸钙对室温硫化硅橡胶密封胶的性能影响

采用硅烷偶联剂对超细CaCO3进行表面改性制备室温硫化(RTV)单组分硅橡胶密封胶,讨论了偶联剂的种类、用量及其表面改性方式对该密封胶性能的影响。研究结果表明,采用硅烷偶联剂事先对CaCO3进行表面处理的改性方法较好;其中用巯丙基三甲氧基硅烷偶联剂(A-189)处理的CaCO3对密封胶的增强效果较好(其拉伸强度为0.57 MPa、最大强度伸长率为159.60%),但脱模时间需要5 d,存在着明显的延迟硫化现象;用3-缩水甘油醚氧基丙基甲基二乙氧基硅烷偶联剂(KBE-402)处理的CaCO3对密封胶的增强效果(其拉伸强度为0.60 MPa,最大强度伸长率为105.00%)优于3-缩水甘油醚氧基丙基三甲氧基硅烷偶联剂(KBM-403)。     

纳米CaCO3的表面改性研究

本文研究了纳米CaCO3表面改性的影响因素，确定了最优改性剂和改性条件，并运用沉降实验、透射电镜（TEM）等表征手段对粉体的改性效果进行了分析。结果表明：以月桂酸钠为改性剂，用量为10％，pH值为7，改性时间为1h时，改性后的纳米CaCO3的亲油化度达到85．1％，能较好地分散于环己烷和二甲苯中。     

超声波直接沉淀法制备纳米氧化锌及改性研究

以硝酸锌和无水碳酸钠为原料,把超声波引入到直接沉淀法中,同时用溴化十六烷基三甲基铵(CTAB)作为表面活性剂,合成出粒径小、分布均匀且团聚现象明显减弱的纳米氧化锌,并用TG-DTA,XRD,SEM等分析手段对制得的产物进行表征,找出合成的最佳条件.同时,还以油酸作为改性剂对所制得的纳米氧化锌进行表面改性,以FT-IR等测试手段对其改性原理进行简单探讨,并通过测定活化指数对改性效果进行分析.     

CaCO3含量对不饱和聚酯树脂固化内应力的影响

分析了CaCO3填料的添加量对不饱和聚酯树脂（UPR）浇铸体拉伸强度的影响，采用应变片电测技术考察了CaCO3含量对其固化过程的影响作用并对固化内应力进行了粗略的计算与分析。结果表明：填料CaCO3的添加量对不饱和聚酯树脂固化应变有显著的影响；填料CaCO3提高不饱和聚酯树脂拉伸强度的原因之一是其降低了浇铸体中固化内应力。     

碳酸钙晶须改性环氧树脂胶粘剂的研究

以碳酸钙(CaCO3)晶须为EP(环氧树脂)胶粘剂的增强填料,研究了填料种类、含量及表面处理方法等对EP胶粘剂性能的影响。结果表明:在其他条件保持不变的前提下,未改性CaCO3晶须可使EP胶粘剂的拉伸剪切强度提高10%~80%,耐热性略有提高,其外推起始热分解温度为370℃;对CaCO3晶须用质量分数为1%的硅烷偶联剂进行表面处理后,其可使EP胶粘剂的拉伸剪切强度提高30%~110%;CaCO3晶须是一种应用前景良好的胶粘剂用增强填料。     

超细CaCO_3制备聚烯烃填充母料

介绍了以超细ＣａＣＯ３制备聚烯烃填充母料的生产原材料、工艺、配方及设备。     

Surface modification of henequen (Agave fourcroydes) fibers by ultraviolet curing with 2‐hydroxyethylacrylate and ethylacrylate: Effect of additives on degradable properties

Henequen fibers were grafted with a double impregnating monomer 2‐hydroxyethylacrylate (HEA) and ethylacrylate (EA) to improve the physicomechanical properties. The fibers soaked in different concentration (1–10%) of monomer + MeOH solution along with photoinitiator Irgacure 907 [2%] were cured under ultraviolet (UV) lamp at different UV radiation intensities (2–14 passes). Concentration of monomer at different radiation intensities was optimized with extent of mechanical properties such as polymer loading, tensile strength, and elongation at break. Enhanced tensile strength (268%) and elongation at break (110%) were achieved by the polymer treated fibers than untreated virgin fibers. We observed that, henequen fibers treated by 3% EA showed better physico‐mechanical properties than those treated by 5% HEA. The tensile properties of henequen fibers treated by 3% EA can be enhanced by adding aloxysilane; 3‐(trimethoxysilyl) propylmethacrylate additives with bulk monomer EA (3%). The degradability of the treated and untreated fibers due to accelerated weathering were also studied and it has been found that surface modified henequen fibers produced more resistivity towards different weathering conditions than untreated fibers. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4000–4006, 2006     

基于青藏高原环境下纳米CaCO3对混凝土性能影响

本文在室内模仿青海地区的干冷、标准、干热三种养护条件,研究不同养护条件不同纳米CaCO3掺量对混凝土强度和微观结构的影响和发展规律;研究结果表明,三种养护环境下,掺加纳米CaCO3都会提高混凝土的强度,掺量在2.5％时提高幅度最大,3d抗压强度提高了49.3％,7d抗压强度提高了10.28％,28 d提高了3.91％;通过电镜扫描试验发现掺加了2.5％的纳米CaCO3的结构最为致密,微观形貌基本上为整体连续的水化硅酸钙凝胶,界面处不存在孔隙和裂隙;压汞试验发现掺量为2％的纳米CaCO3相比基准组来说,无害孔和少害孔增加,而有害孔和多害孔减少,利于改善混凝土的孔径分布.     

碳酸钙对UPVC型材性能的影响

从碳酸钙的形态、表面性质及填充量等角度,分析了其对UPVC异型材的加工工艺、物理性能等方面的影响     

纳米CaCO3的表面改性及其在软PVC中的应用

本文合成了系列表面改性剂ADDP，并将其用于改性纳米CaCO3。研究了表面改性后纳米CaCO3的性质及其随ADDP分子结构和用量的变化规律。最后，将改性纳米CaCO3充填改性软质PVC。     

PP／CaCO3复合材料的力学性能研究

通过采用熔融共混的方法制备了PP／CaCO3复合材料，然后对复合材料的力学性能进行分析，研究了微米级和纳米级CaCO3的表面处理、含量对PP／CaCO3复合材料力学性能的影响规律，并对此影响规律进行合理的解释。     

表面改性对矿物补强NBR/PVC弹性体的研究

对矿物填料进行适当的改性处理，使丁腈橡胶／聚氯乙烯(NBR／PVC)弹性体具有明显的补强效果。探讨了矿物填料、偶联剂对NBR／PVC弹性体力学性能的影响。     

Microporous polypropylene sheets containing CaCO3 filler: Effects of stretching ratio and removing CaCO3 filler

Microporous polypropylene sheets are prepared by biaxially stretching polypropylene sheets containing CaCO₃ filler. Here, the stretching ratio is one of the most important factors in the preparative process, and removing the CaCO₃ filler also affects the sheet properties. Their effects were studied in relation to the properties and the structure of the microporous polypropylene sheets. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68: 1543–1553, 1998     

Cut‐out filter for ultraviolet radiation from poly(vinyl alcohol)

The effects of ultraviolet (UV) radiation and thermal annealing on the optical and mechanical properties of polyvinyl alcohol (PVA) were studied. Pure PVA samples were prepared by casting technique. Xenon arc lamp was used to irradiate the sample. The irradiated PVA sample was heated at 150°C for 2 h. The optical and mechanical properties of original, irradiated, and irradiated and then heated samples were measured. The irradiated and then heated sample showed lower transmission in the wavelength range from 190 to 320 nm and the transmission was higher in the visible region than the original and irradiated samples. The stress–strain measurements were performed. Modulus of elasticity of the double‐treated sample was approximately four times higher than that of original sample. The obtained results show the possibility of using this sample as cut‐out filter for UV radiation. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 1295–1299, 2002; DOI 10.1002/app.10486