Antimicrobial surface coatings for polypropylene nonwoven fabrics

Anionic and cationic N-halamine polyelectrolytes were synthesized, characterized and then immobilized onto melt-blown polypropylene fabrics having two different basis-weights. The coatings were rendered biocidal upon exposure to dilute sodium hypochlorite solution. The effect of single and multilayer deposition of the polyelectrolytes on the surfaces was investigated in terms of chlorine loadings, rechargeabilities, antimicrobial efficacies, and air permeabilities. It was found that all of the coatings provided remarkable biocidal efficacies with about six log reductions of bacteria within two min of contact time on filters having higher basis-weight, whereas slower inactivation was observed for lower-basis weight filters due to diminished surface areas and numbers of active halogen atoms. The antimicrobial coatings reduced the air permeabilities of the filters somewhat; however, the air permeabilities of the coated swatches were comparable to those of most protective textiles.     

聚丙二醇烷基醚在阴极电泳涂料中的应用研究

探讨了不同用量的聚丙二醇烷基醚对阴极电泳涂料槽液性能、成膜性能及涂膜性能的影响;选择合适的添加量使阴极电泳涂料在成膜性能上明显提高,同时增强涂膜抗石击、柔韧性等机械性能。     

Epoxidized polyurethaneamide and polyesteramide as petroleum pipeline coatings

Linseed oil fatty acids were epoxidized by peracetic acid, then reacted with diethanolamine to give epoxidized hydroxy ethyl linseed oil fatty acid amide ( I ). This amide was rejected with toluene diisocyanate to produce epoxidized polyurethane-amide ( II ). Component I was also reacted with phthalic anhydride to give epoxidized polyesteramide ( III ). Resins II and III were evaluated as coating materials. The results obtained were compared with commercial epoxy resin, and show that resins II and III may be suitable to use as petroleum pipeline coatings.     

机壳外表面用弹性手感涂料的配方设计及应用

通过选用合适的弹性树脂为主体,配合助剂和固化剂的选择进行配方设计,阐述了弹性手感涂料的配制及其施工工艺。测试结果表明该涂料具有附着力佳、手感细腻滑爽、抗划伤力强、优异的耐腐蚀等性能。     

Virus removal from aqueous environments with polyelectrolyte coatings on a polypropylene fleece

The adsorption of viruses from aqueous solution is frequently performed to detect viruses. Charged filtration materials capture viruses via electrostatic interactions, but lack the specificity of biological virus-binding substances like heparin. Herein, we present three methods to immobilize heparin-mimicking, virus-binding polymers to a filter material. Two mussel-inspired approaches are used, based on dopamine or mussel-inspired dendritic polyglycerol, and post-functionalized with a block-copolymer consisting of linear polyglycerol sulfate and amino groups as anchor (lPGS-b-NH₂). As third method, a polymer coating based on lPGS with benzophenone anchor groups is tested (lPGS-b-BPh). All three methods yield dense and stable coatings. A positively charged dye serves as a tool to quantitatively analyze the sulfate content on coated fleece. Especially lPGS-b-BPh is shown to be a dense polymer brush coating with about 0.1 polymer chains per nm². Proteins adsorb to the lPGS coated materials depending on their charge, as shown for lysozyme and human serum albumin. Finally, herpes simplex virus type 1 (HSV-1) and severe acute respiratory syndrome coronavirus type 2 (SARS-CoV-2) can be removed from solution upon incubation with coated fleece materials by about 90% and 45%, respectively. In summary, the presented techniques may be a useful tool to collect viruses from aqueous environments.     

热熔型路标涂料使用中存在的主要问题与解决方案

介绍了热熔型道路标线涂料在使用中出现的一些常见问题、原因分析和解决手段。     

管道配重新材料的探讨

在水下长输管道的敷设施工过程中,由于浮力和水动力作用,仅依靠管道自身重力,不能保持管道沉降深度和稳定,需采取有效经济的稳管措施,才能将管道稳定的固定在管沟内。文章简要介绍了常用的几种稳管方式,并对比介绍了一种新型用于水下管道施工过程中稳管的袋式压重方法,论述了软袋式压重的结构形式、工程应用范围及应用实例,通过与其他管道稳管形式比较,得出结论:新型填充式压重软袋与传统的混凝土压重相比,优点在于由织物制作的袋体将减少刮伤管道涂层的几率,有利于延长管道使用寿命。     

节能环保型水性环氧涂料在推广应用中的尴尬

介绍了节能环保型水性环氧涂料的特点及在生产和使用中的优势,阐述了其在推广使用中遇到的困难,并从政策法规、性价比、施工习惯等方面提出了看法和建议,以引起相关部门的重视。     

The polymer-polymer interaction parameter in polybutene-1/polypropylene blends

The blends of polybutene-1 and polypropylene (PB-1/PP) prepared by mixing in xylene at 130 °C and then precipitating in cool methanol are subject to differential scanning calorimetry analysis. The melting temperatures of both components in the blends are determined. The melting temperature depressions of the blends at various compositions are reported and the method developed by Nishi and Wang is used to calculated the interaction parameterX in the blend. All theX values found are negative in the range -0.052 – -1.10, indicating that PP and PB-1 in the amorphous region are compatible.     

聚丙烯技术现状

本文主要介绍了目前国内外应用最广泛的两类聚丙烯生产技术:本体工艺和气相工艺。本体工艺又包括Hypol和Spheripol两种,气相工艺包括Novolen、Unipol和BP Amoco三家公司的气相工艺。文中还介绍了聚丙烯的四种改性技术以及相关的研究进展情况。最后就聚丙烯的未来发展状况做了展望。     

改性氯化聚丙烯的性能与应用

氯化聚丙烯(CPP)被广泛用作聚丙烯(PP)塑料上涂层的附着力促进剂。向CPP中引入含氧的极性基团可以大幅度提高其与丙烯酸树脂的相容性,改善涂层对PP底材的附着力。通过红外光谱、紫外-可见光谱、X-射线光电子能谱和X-射线衍射等方法分析了一种新型的基于CPP的附着力促进剂,并与市场上普遍使用的同类产品进行了比较,考察了由此新型附着力促进剂制备的PP底漆、色漆和金属涂料的性能。     

纳米SiO_2制备方法及其在涂料中的应用前景

介绍了国内外纳米SiO2的制备方法,并重点介绍了其在涂料中的应用前景。     

双组分道路标线涂料的制备与应用

采用活性丙烯酸树脂与丙烯酸单体为基体,用引发剂交联固化,制备出具有黏度低、固体含量高、固化时间适宜、低污染、耐磨、与玻璃珠粘结牢固、耐候性好等特点的双组分道路标线涂料。着重讨论涂料配方中的树脂、活性单体、钛白粉的用量及填料粒径的合理级配。     

含氟聚酰亚胺的研究及其在涂料中的应用

介绍了含氟聚酰亚胺的分类和研究动向,重点介绍了含三氟甲基及六氟丙基的聚酰亚胺的特点和性能。阐述了含氟聚酰亚胺在绝缘涂料中的应用,并对含氟聚酰亚胺在光电材料、复合材料和气体分离膜等领域中的应用进行了概述。     

聚氨酯改性环氧树脂的制备及其在涂料中的应用

制备了聚氨酯改性环氧树脂,对其结构进行了表征,测试了以其制备的涂料的性能,结果表明:引入聚氨酯链段可以改善环氧树脂的韧性,对耐热性影响很小,涂料综合性能良好。     

聚天冬氨酸酯聚脲的合成及其在地坪涂料中的应用

通过试验合成了聚天冬氨酸酯,并分析讨论了R结构、温度、水分含量、-NCO、软硬段含量对聚脲的影响,提供了聚天冬氨酸酯聚脲所制地坪涂料的参考配方和检测指标。     

The toughening mechanism of polypropylene/calcium carbonate nanocomposites

The toughening mechanism of polypropylene (PP) filled with calcium carbonate (CaCO₃) nanoparticles is described. In a previous study (Macromolecule 2008;41:9204), we observed that intensive ligament-stretching following debonding of nanoparticles was responsible for the significant improvement in the impact toughness of the annealed PP/CaCO₃ nanocomposites. Furthermore, we hypothesized that strong ligaments, which have high fracture stresses, are needed to stabilize the crack-initiation process and to increase the energy dissipation in the crack-initiation stage. In this study, we used a high-molecular-weight PP to test this hypothesis because strong ligaments could be created from this high-molecular-weight PP. The notched Izod impact strength of the nanocomposites containing the high-molecular-weight PP and 20 wt% CaCO₃ nanoparticles with a monolayer coating of stearic acid was measured to be about 370 J/m, whereas the impact strength of the unfilled PP was 50 J/m. The size of the plastic deformation zone was found to be dependent on the molecular weight of the PP matrix because the strong ligaments of the high-molecular-weight PP enabled the expansion of the plastic deformation zone, leading to a considerable increase in the impact strength. The synergic effect of the high-molecular-weight PP and the monolayer-coated nanoparticles produced nanocomposites with high impact strength, which is much greater than the inherent impact strength of the unfilled polymer. In addition, the effect of the high-molecular-weight PP on the dispersion of the nanoparticles was investigated.     

The pigmentation of powder coatings with the use of block copolymer dispersants

The dispersing of pigments in powder coatings is a difficult and complicated process. The incomplete dispersion under standard extrusion conditions can be attributed to a combination of poor pigment wetting and insufficient disruption of the pigment agglomerates, as a result of the rheological properties of the powder coating resin. The use of block copolymer dispersants for improving the pigment dispersion in powder coatings is studied in this project. Novel block copolymer dispersants from 2-vinylpyridine and ε-caprolactone have been synthesized and tested. These block copolymers show a high affinity for TiO₂ pigments and are capable of improving the stability of a TiO₂ dispersion in a polyester powder coating resin.     

The influence of stem conformation on the crystallization of isotactic polypropylene

The influence of stem conformation on the crystallization of i-PP is studied by growing α-form lamellae in melts of β-form lamellae at different temperatures. The melting of β-form lamellae and the crystallization of α-form lamellae is observed in situ at the interface of α- and β-form spherulites by AFM. The growth rate of α-form lamellae in the melt of β-form lamellae is much lower than that in the isotropic melt due to the stem conformation barrier, which originates from the difference in the α and β unit cell packing models.     

Nucleation of branches in elastomeric polypropylene

The formation of a crosshatched morphology during crystallization of an isotactic polypropylene with low crystallinity is studied in detail. Here, a lamella seems to grow through another nearly perpendicular lamella that was crystallized before. The crystallization was observed with in situ scanning force microscopy with a temporal resolution of 3 min per image. After crystallization the volume structure was imaged by nanotomography. A detailed scheme for the nucleation of branches is proposed.