可再分散聚合物乳胶粉的制备方法及应用

介绍了可再分散聚合物乳胶粉制备过程中聚合物母体乳液的技术要求、单体、制备工艺、干燥工艺以及外加添加剂,的研究现状,并概述了可再分散聚合物乳胶粉在水泥基材料中的作用机理和它在外墙外保温、瓷砖黏结剂、建筑腻子、自流平砂浆中的应用。     

可再分散乳胶粉在外墙外保温中的应用

在欧美等发达国家，建筑物主要应用含有保温材料，如发泡聚苯乙烯板（EPS）的外墙外保温体系（ETICs)获得保温节能以及舒适的居住环境的效果。作为外墙外保温体系的关键组成部分，德国威凯公司VINNAPAS可再分散乳胶粉改性的聚合物干混砂浆保证了体系的耐久性与稳定性。     

EPS薄抹灰外墙外保温系统质量控制措施

本文从外墙外保温系统组成材料的角度出发,对目前建筑节能外墙外保温系统在实际推广应用中暴露的质量问题进行了分析,并指出对外墙外保温系统进行认识研究及施工是其质量保证的前提,配套砂浆中正确的选择使用可再分散乳胶粉,可以赋予外墙外保温系统长期的耐久性,这是系统具有高性价比的基础。     

可再分散乳胶粉的研究进展及其应用

本文简述了可再分散乳胶粉的性能。着重介绍了可再分散乳胶粉的制备,包括单体及配方的选择、聚合方法和干燥工艺,综述了可再分散乳胶粉的改性及其在建筑腻子、外墙外保温材料、内外墙装饰材料、地坪材料等方面的应用。指出以水溶性高分子为乳液聚合主要稳定剂的乳液聚合是一种新的思路。     

可再分散乳胶粉在新型外墙柔性腻子中的应用

采用可再分散乳胶粉等原料制备了用于外墙外保温体系的新型柔性腻子,探讨了可再分散乳胶粉的用量对柔性腻子的粘接性能、抗动态开裂性能等影响。结果表明:可再分散乳胶粉对该腻子具有明显的增强作用,并且可改善其柔韧性;当聚灰比为14%时,该腻子可获得较理想的柔性。     

瓦克在土耳其拓展市场

德国瓦克集团(Wacker)2012年9月13-15日在伊斯坦布尔涂料展会上面向土耳其涂料工业展示了一系列创新的聚合物和有机硅产品,其中包括供外墙抹灰和外墙外保温系统使用的憎水性可再分散乳胶粉,低气味、低排放内墙涂料用VAE乳液,以及用于可使高品质地坪自流平砂浆达到严格环保标准的粘结剂等,此外还有内墙涂料用有     

外墙外保温系统用粘接砂浆研究进展

介绍了外墙外保温系统用粘接砂浆的性能要求,阐述了无机组分(如水泥、无机填料等)、聚合物添加剂(如可再分散乳胶粉、纤维素醚等)对粘接砂浆性能的影响。总结了目前粘接砂浆的研究成果和存在的主要问题(包括聚合物添加剂相互作用机制尚不明确、提高粘接性能与降低成本之间的矛盾、粘接强度检测方法不一致等)。     

叔碳酸乙烯酯改性VAE乳液的研究

在VAE乳液生产工艺中引入改性单体叔碳酸乙烯酯,通过调整改性单体的加入量、选择合适的乳化剂和保护胶体的品种和用量,生产出符合DBJ/T01-63-2002《外墙外保温用聚合物砂浆质量检验标准》并适合喷雾干燥生产可再分散乳胶粉的三元共聚乳液。     

疏水性可再分散聚合物乳胶粉的研究进展

对可再分散聚合物乳胶粉进行疏水性改性是提高其应用性能的重要方法。本文概述了疏水改性的可再分散聚合物乳胶粉的制备技术,对脂肪酸及其衍生物、硅烷等疏水改性的可再分散聚合物乳胶粉的特性和应用进行了论述,指出了疏水性可再分散乳胶粉用于水泥砂浆、新型内外墙干粉涂料等建筑材料可赋予材料良好的疏水性,从而提高其性能和使用寿命。     

瓦克展出面向土耳其涂料与油漆工业的众多产品

瓦克集团以“Go for the Optimum”为主题，最近在伊斯坦布尔涂料展会（paintistanbul）32展出一系列面向土耳其涂料与油漆工业的聚合物和有机硅产品。展出产品包括供外墙干抹灰和外墙外保温系统使用的憎水性可再分散乳胶粉，低嗅味、低排放内墙涂料用VAE乳液，以及用于可使高品质地板自流平砂浆达到严格环保标准的黏结剂等，种类非常丰富。展会其他亮点产品为内墙涂料用有机硅助剂、药物与食品包装用表涂树脂。     

应用于选择性激光烧结的结晶性高分子材料粉末的工艺评述

从3个方面对结晶性高分子材料粉末在选择性激光烧结(SLS)的工艺进行评述,分别为高分子材料粉末的制备工艺、高分子材料粉末的复合改性工艺和高分子材料粉末的SLS工艺。其中在高分子材料粉末的制备工艺中对高分子材料粉末的制备方法和基本要求,以及高分子材料粉末在SLS工艺中的性能表征及使用的仪器设备等进行了介绍;在高分子材料粉末复合工艺中对复合改性方法和改性目的进行了叙述;在高分子材料粉末的SLS工艺中对影响成型件精度的各种参数进行了阐述。     

New silicate-based powders for fire protection of thermoplastics

A new, intumescent powdered silicate additive for plastics (polyethylene and polyvinyl chloride) has been investigated that gives improved flame retardancy. Cone calorimeter evaluations of the compounds of polymer/powder show reduction in peak rate of heat release, total heat release, and rate of mass loss. The effects of various polymer/powder ratios and powder particle sizes on the fire protection performance are shown. The morphology of this powder and the polymer/powder compounds before and after combustion is observed. A fire-protection mechanism is discussed that suggests the importance of an interpenetrating char structure.     

可再分散性聚合物粉末的制备研究

在保护胶体存在下,通过乳液聚合制得了可再分散性聚合物粉末。比较了可再分散性聚合物粉末再分散液与聚合原乳液的稳定性、最低成膜温度、成膜的力学性能,考察了可再分散性聚合物粉末在水泥中的应用。结果表明与聚合原乳液相比,聚合物粉末再分散后乳液粒径稍大,粒径分散均匀,可以稳定存在,最低成膜温度比聚合原乳液的高,力学性能比聚合原乳液膜的低。可再分散性聚合物粉末完全适用于干粉水泥砂浆的改性,对水泥压剪强度改善效果显著。制备可再分散性聚合物粉末的最佳配方(份)为保护胶体66.7、过硫酸钾0.1、苯乙烯8、丙烯酸丁酯10、水8、十二烷基苯磺酸钠0.02、甲基丙烯酸-2-羟乙酯1、甲基丙烯酸0.6、丙烯酰胺0.4、十二烷基硫醇0.02。     

无机粉体填充改性热塑性塑料机理探讨

介绍了无机粉体填充改性机理及影响界面特性的因素如界面应力、高分子树脂的极性、无机粉体与高分子树脂间的相容性、无机粉体粒径等。同时综述了复合材料的微观相界面设计与调控技术。通过对无机粉体的表面性能进行优化与改进,可设计并制造出性能更加优异的复合材料。     

Modification of cellulose powder surface by grafting of polymers with controlled molecular weight and narrow molecular weight distribution

To modify cellulose powder surface, the grafting of polymers with controlled molecular weight and narrow molecular weight distribution onto the surface by the termination of living polymer cation with amino groups introduced onto cellulose powder surface was investigated. The introduction of amino groups onto cellulose powder surface was achieved by the treatment of cellulose powder with isatoic anhydride. It was found that cellulose powder having amino groups are readily reacted with living poly(2‐methyl‐2‐oxazoline) (polyMeOZO) cation, which was generated by ring‐ opening polymerization with methyl p‐toluenesulfonate as an initiator, and polyMeOZO with controlled molecular weight and narrow molecular weight distribution was grafted onto the surface. By the termination of living poly(isobutyl vinyl ether) (polyIBVE), which was generated by the polymerization with HCl/ZnCl₂ initiating system, with amino groups on cellulose powder, polyIBVE was also grafted onto the surface. The mole number of grafted polymer chain on cellulose powder surfaces decreased with increasing molecular weight of the living polymer cation, because of increasing steric hindrance with increasing molecular weight of living polymer cation. Wettability of cellulose powder surface to water was found to be controlled by grafting of hydrophilic or hydrophobic polymer onto the surface. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 75: 515–522, 2000     

废轮胎橡胶粉在自粘聚合物改性沥青防水卷材中的应用探究

本文探索了采用橡胶粉制备自粘聚合物改性沥青防水卷材的可行性及影响因素。结果表明采用20%的60目橡胶粉可以制备满足GB23441-2009要求的自粘聚合物改性沥青防水卷材。由于橡胶粉交联态属性限制了分子链运动能力,不能充分发挥线性化橡胶的特性。为充分实现橡胶粉中橡胶特点,本文探索了脱硫胶粉用于制备自粘聚合物改性沥青防水卷材可行性。结果表明采用脱硫降解程度（活化度）在50%左右的脱硫胶粉可用于制备性能优异的防水卷材。适宜的配比为（以沥青为100质量份计）50%的脱硫胶粉、6% SBS以及60%滑石粉。由于活化胶粉中的小分子组分与相容剂、线性化大分子橡胶组份以及甲苯不可溶物与SBS作用机理类似,上述共同作用可替代传统方案中的相容剂、橡胶粉以及部分SBS,并得到优异的综合物理性能     

Grafting reaction of living polymer cations with amino groups on chitosan powder

The grafting of polymers having controlled molecular weight and narrow molecular weight distribution onto chitosan powder by the termination of living polymer cation with amino groups on chitosan powder was investigated in heterogeneous system. The amino groups of chitosan powder successfully reacted with living poly(isobutyl vinyl ether) [poly(IBVE)] and poly(2-methyl-2-oxazoline) [poly(MeOZO)] cation with controlled molecular weight and narrow molecular weight distribution to give the corresponding polymer-grafted chitosan powders. The percentage of poly(MeOZO) grafting gradually increased and reached 24.5% after 4 days. The solubility of poly(MeOZO)-grafted chitosan in water increased with an increase in the amount of grafted polymer. It was suggested that grafting reaction of living polymer cation with chitosan powder proceeds from surface amino groups to inner amino groups of the powder with progress of the reaction. The mole number of grafted polymer chain on chitosan powder decreased with an increase in the molecular weight of the living polymer cation because the steric hindrance of functional groups of chitosan powder increased with the increasing molecular weight of living polymer. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68: 1883–1889, 1998     

云母粉在高分子材料改性中的研究进展

综述了近几年来国内外关于云母在高分子材料改性中应用的研究进展.介绍了云母的性质,云母加入高分子材料中对高分子材料性能的影响,并指出云母在高分子改性中有待于深入研究的几个问题,展望了今后的发展方向.     

Ambient temperature compaction of polycarbonate powder

Solid-state processing of polymer powders through compaction and sintering has potential advantages over conventional polymer processing methods; however, pressureless sintering of compacted polymer powders has often been unsuccessful. Room temperature compaction of polycarbonate (PC) powder was studied in an effort to better understand the fundamental mechanisms that control polymer compaction and sintering. It was found that differences in the degree of physical aging affect the compaction behavior of PC powder. The results presented in this paper show that the degree of physical aging of thermoplastic polymer powders, which can be influenced by commonly used powder handling operations such as drying and long term storage, can ultimately affect the ability of the powder to be successfully compacted at room temperature.     

双转子混炼机中固体粉末与聚合物共混的数值模拟

利用聚合物加工分析软件POLYFLOW模拟了双转子连续混炼机中固体粉末在聚合物中的混合过程,并对不同转子转速下的三维等温非牛顿流场进行了流场和动态混合计算和统计学后处理。采用累积停留时间分布表征混合物的轴向混合性能,用团聚体累积粒径尺度分布表征固体粉末团聚体在聚合物基体中的分散状态,直观反映出团聚体在聚合物流场中粒径的变化情况,并用分离尺度分布表征混合物的分布混合性能。结果表明：在一定范围内提高转子转速有利于固体粉末/聚合物的分散、分布混合性能,确定合理的转速范围对于获得高性能聚合物复合材料至关重要。