共查询到19条相似文献,搜索用时 125 毫秒
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新型PVC自由发泡板的研制 总被引:2,自引:0,他引:2
从原材料的选用,不同助剂的性能及在配方中的作用,以及配混过程中各组分的用量几个方面介绍PVC自由发泡板的配方设计,并介绍了PVC自由发泡板的生产工艺流程及挤出过程中温度、速度等影响板材质量的几个重要参数的设置;分析了生产中几种常见的问题并提出了相应的解决办法。研制出了合格的PVC自由发泡板,该板材具有优良的性能,可代替木材用于许多行业。 相似文献
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综述了近年来应用于建材装饰领域的发泡聚氯乙烯(PVC)的技术进展。结果表明,加入阻燃剂与绝热材料可以提升PVC发泡板耐高温性能与防火性能;通过控制干燥木质纤维粉水分含量不大于1%(w),与长玻璃纤维一同经过双螺杆挤出机可以制备高强度PVC木塑发泡板;采用水晶珠光颜料、发泡剂及PVC配制成糊料经圆网印刷在无纺布上,可以得到闪耀透明的PVC发泡墙纸。 相似文献
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通过对碳酸钙、硅灰石和滑石粉填充聚氯乙烯(PVC)发泡人造革的试验,研究了不同填料用量及发泡时间对PVC发泡人造革发泡倍率的影响。结果表明:若保持发泡配方中的其他组分含量不变,只改变某一填料用量,PVC发泡倍率随碳酸钙或硅灰石添加量的增加而降低;而对于滑石粉用量,在发泡时间较短时,用量达到30份,PVC发泡倍率出现最大值,当发泡时间较长时,发泡倍率随着滑石粉添加量的增加而升高;若保持发泡配方中发泡剂和发泡助剂的相对含量及混合料黏度不变,碳酸钙和硅灰石用量分别达到60份和55份(树脂为80份)时,PVC发泡倍率出现最大值。对于滑石粉,发泡时间短时,发泡倍率随着其添加量的增加而升高,发泡时间长时,填加30份,PVC发泡倍率会出现最大值。 相似文献
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介绍以偶联剂活化共混粉煤灰/碳酸钙(PFA/CaCO3)两种填料在生产PVC木塑结皮发泡建筑模板中的应用研究。探讨了共混活化料对PVC木塑结皮发泡复合材料的改性机理,研究了其不同用量的活化料配方对木塑复合材料在加工应用方面及对产品力学性能的影响。结果表明:两种活化料填充生产的PVC木塑结皮发泡板材较一种活化料改性效果显著,在物料的塑化性能、相容性、加工稳定性和产品的综合力学性能都得到了改善和提高。 相似文献
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PVC/木粉复合材料挤出发泡成型的研究 总被引:1,自引:0,他引:1
介绍木塑复合材料挤出发泡成型的发展和加工难点,并针对聚氯乙烯(PVC)/木粉复合材料挤出发泡的成型方法,从原料、配方、工艺、设备等方面作了详细分析。最后简述了PVC/木粉复合材料挤出发泡制品的性能及影响制品性能的主要因紊。 相似文献
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以CM/EPDM并用胶为基材制得发泡材料,研究了不同填料和增塑剂对发泡材料性能的影响。结果表明,添加碳酸钙和纳米碳酸钙均可制得泡孔均匀、力学性能优良的发泡材料;碳酸钙用量为20~30份且DOP用量为20份时,发泡材料硫化速率和发泡剂分解速率匹配较好,密度小,发泡倍率高,力学性能好;DOP/石蜡油并用且随石蜡油用量的增加,发泡材料发泡倍率提高,密度减小。 相似文献
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碳酸钙填充EVA/再生PE体系的发泡效果 总被引:8,自引:2,他引:6
对几种不同规格的碳酸钙(分别为400目、800目和2500目重质碳酸钙)对EVA/再生PE体系的发泡效果进行了研究,通过对发泡曲线、发泡体体积膨胀率、表观密度和硬度的比较分析,对三种不同目数的碳酸钙在不同填充量时的发泡效果进行了评价。结果表明,三种规格碳酸钙的发泡有相似之处,尤其是都表现出了高填充(180份)和高发泡(发泡体积膨胀倍数≥6)的可行性。 相似文献
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《Gas Separation & Purification》1992,6(3):149-151
Carbon dioxide (CO2) is removed by absorption in hot potassium carbonate (HPC) solution in ammonia plant. Under actual field conditions, HPC solution can be easily contaminated by system impurities in the circulating solution. These impurities enhance foaming in the CO2 removal system, which has significant effects in reducing equipment capacity and increasing processing time. In this study, it is assumed that the main cause of foaming is the presence of potassium soap in the HPC solution. The effects on foaming problems of adding calcium oxide have been investigated. The role of a charcoal bed and filtration have also been examined. The results showed that a significant reduction in foam height in an actual field solution can be obtained by using calcium oxide. Values of up to 97% reduction in foam height have been achieved. 相似文献
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Sandra Schlögl Martin ReischlVolker Ribitsch Wolfgang Kern 《Progress in Organic Coatings》2012,73(1):54-61
The generation of microcellular foams via a photochemical initiation mechanism is a new approach aimed at the one step production of three dimensional structures in offset printing techniques. The photochemical foaming involves the excitation of a selected photoacid generator with ultra-violet (UV) light to release Brønsted acids. Carbon dioxide, formed upon the reaction of the Brønsted acid with calcium carbonate particles, is used as blowing agent. In order to achieve efficient proton formation and consequently generate a sufficient amount of blowing agent, photosensitizers are employed. Long wavelength absorbing anthracene derivates are added to capture a higher fraction of the light source, a conventional mercury arc lamp, to sensitize the photolysis of the photoacid generator. The microcellular foaming was performed with a commercially available UV curable offset ink formulation containing triacrylate oligomers. To ensure that the gas bubbles are trapped in the cured resin a balance has to be found between the curing speed of the ink and the foaming speed. In the present study crucial process parameters including photoacid generator level, choice of photosensitizer, light intensity and concentration of calcium carbonate particles are evaluated and their influence on the foam properties are discussed. Both the cell morphology and the expansion of the film thickness are characterized with optical microscopy and mechanical methods. The results clearly show that the UV assisted foaming leads to the formation of dense and uniform microcells by applying optimized process parameters. Moreover, the relative thickness of the ink layer can be raised up to 90% which makes the one-step production of three dimensional structures (e.g. reliefs) at short reaction times and ambient temperatures feasible. 相似文献
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起泡剂的起泡性能及使用浓度优选研究 总被引:1,自引:0,他引:1
起泡剂的起始发泡体积和泡沫稳定性是决定起泡剂起泡性能的两个重要因素,也是实际应用当中筛选起泡剂的重要指标.采用Ross-Miles法对13种不同类型起泡剂在常温下的起泡性能进行了评价.结果表明:不同类型起泡剂的起始发泡体积和泡沫稳定性具有显著的不同.不同起泡剂的起始发泡体积随浓度的增加而增大.当起泡剂浓度增加到0.5%时,起始发泡体积趋于稳定,由此确定起泡剂的最佳使用浓度为0.5%. 相似文献
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The average foam life is proposed as an index to the foaming behavior in molten slag. The molten slag system of Na2B4O7-CaO-MgO is foamed by the gas from the thermal decomposition of carbonate minerals as the foamer. The experimental results show that foamer type and particle size have influence upon the average foam life of slag. The concentration of CaO and MgO in molten slag not only varies the physical properties of melt but also influences directly the decomposition rate of carbonate and the bubble size of gas, thus playing an important role in foaming and to foam stability of slag. 相似文献
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用天然橡胶制备彩色发泡胶球,研究了发泡剂及发泡助剂、硫化体系、填充体系、混炼和硫化工艺以及发泡工艺等对发泡胶球品质的影响。结果表明,发泡剂选用二亚硝基五亚甲基四胺与小苏打和尿素脂BK并用体系可使胶球的泡孔细密均匀,气味很小;硫化体系采用临界温度较低的促进剂TT、CZ及M与硫黄并用能使硫化程度与发泡速率很好地匹配;选择轻质碳酸钙和滑石粉作为填充体系、使用门尼黏度为20~40的胶料及采用二段硫化工艺时所制备发泡胶球的泡孔细密、结构理想,发泡倍率与国外胶乳发泡制品相当。 相似文献
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采用二氧化碳(CO2)与乙醇(EtOH)组合物理发泡剂对聚苯乙烯(PS)进行连续挤出发泡,并探讨了2种发 泡剂组成比率对PS挤出发泡板材发泡倍率及泡孔形貌的影响。通过真密度测定仪和扫描电镜对发泡样品的密度、 发泡倍率和泡孔形态进行测试。结果表明,在组合发泡剂连续挤出PS发泡过程中,提高CO2的用量更有利于增加泡 孔成核数量和减小泡孔尺寸,而提高EtOH用量可以增大泡孔尺寸,提高发泡剂总量,有利于降低泡沫密度。 相似文献