新材料在钢结构膨胀型防火涂料中的应用

本文介绍了改善和提高铜结构膨胀型防火涂料性能的几种新材料,其中晶须材料增加了防火涂料的施工厚度和耐火时间,石墨层间化合物增加了防火涂料的耐火时间和耐水性,氟素改善了防火涂料的理化性能和外观性能,双氢氧化物提高防火涂料的防火性能。     

钢铁材料含氟聚合物协合涂层技术研究

为了解决钢铁材料的耐磨自润滑问题,研究了钢铁材料化学镀镍协合含氟聚合物涂层技术.首先,采用化学镀的方法,在钢铁表面制备化学镀镍层,然后进行扩孔处理,并引入功能性氟聚合物,通过真空精密热处理改性,最终形成协合涂层.涂层显微维氏硬度HV(0.5N)∶ 680～850,动摩擦因数小于0.15,具有干膜润滑性能,耐5%中性盐雾试验500h,综合性能优异.采用SEM、x-ray 能谱分析等对涂层的组织结构进行了观察和分析,探讨了协合机理.     

Fluorinated‐plasma modification of polyetherimide films

Ultem 1000 polyetherimide films prepared by cast-evaporating technique were covered with a 1H,1H,2H-tridecafluoro-oct-1-ene (PFO) plasma-polymerized layer. The effects of the plasma exposure time on the surface composition were studied by X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and surface energy analysis. The surface topography of the plasma layer was deduced from scanning electron microscopy. The F/C ratio for plasma-polymerized PFO under the input RF power of 50 W can be as high as 1.30 for 480 s and ∼0.4–2 at % of oxygen was detected, resulting from the reaction of long-lived radicals in the plasma polymer with atmospheric oxygen. The plasma deposition of fluorocarbon coating from plasma PFO reduces the surface energy from 46 to 18.3 mJ m⁻². © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3579–3588, 2006     

Enhancement of hydrostatic pressure for water repellent treated fabrics

The aqueous dispersions based on perfluorinated acrylate and other comonomers were prepared by means of emulsion polymerization in the presence of stearyl trimethyl ammonium chloride (STAC) and 2,2′‐azobis(2‐amidinopropane) dihydrochloride (ABAP) as water‐soluble initiators. Several different types of resins and additives were added with the water‐repellent polymers. Hydrostatic pressure and water repellency of fabrics that were treated by fluorinated water repellents with different recipes were measured and compared. In addition, the nano clay and the blocked isocyanate crosslinking agent (Jintexguard FCN) do, indeed, substantially increase the hydrostatic pressure. Actually, increased hydrostatic pressure for the water repellent treated fabrics is our objective of this study. However, our recipes containing the fluorinated‐acrylate copolymer, nano clay, and Jintexguard FCN will successfully provide excellent hydrostatic pressure, excellent water repellency, and excellent soft hand. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 4711–4715, 2006     

Synthesis and characterization of p‐perfluoro{1‐[2‐(2‐fluorosulfonyl‐ethoxy)propoxy]}ethylated poly(α‐methyl styrene)

p‐Perfluoro{1‐[2‐(2‐fluorosulfonyl‐ethoxy)propoxy]}ethylated poly(α‐ methyl styrene) 3 was synthesized via electron transfer of perfluoro‐di{2‐[2‐(2‐fluorosulfonyl‐ethoxy)propoxy]}propionyl peroxide 2 and poly(α‐methyl styrene) 1 at different reactant molar ratios (2 : 1). The modified polymer 3 was characterized by various techniques. The ring p‐substitution was proved by FTIR and ¹⁹FNMR. The desulfonation appeared at above 124°C was found by TGA. The molecular weight determined by GPC increased with the increase of reactant molar ratio, and the polydispersity values indicated there was no degradation of the parent polymer chain in the reaction. Followed by hydrolysis and acidification, the modified polymer 3 could be further quantitatively converted into its sulfonic form 4. Ion exchange capacity of novel polyelectrolyte 4 can be controlled by changing reactant molar ratio (2 : 1). © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3615–3618, 2006     

含氟低表面能ABS树脂的结构与性能

甲基丙烯酸（2,4-二三氟甲基）十二氟戊酯（FA）接枝聚丙烯腈-丁二烯-苯乙烯（ABS）得到一种新型树脂,用红外光谱（FT-IR）和光电子能谱（XPS）证实了产物反应结合的结构。文中同时研究了产物的表面性能和热性能。结果表明,甲基丙烯酸（2,4-二三氟甲基）十二氟戊酯的加入量控制在6phr时,接枝率为11.8%,所得产...     

纳米压印光刻胶

光刻胶是纳米压印的关键材料,其性能将影响压印图形复制精度、图形缺陷率和图形向底材转移时刻蚀选择性。提出了成膜性能、硬度黏度、固化速度、界面性质和抗刻蚀能力等压印光刻胶的性能指标。并根据工艺特点和材料成分对光刻胶分类,介绍了热压印光刻胶、紫外压印光刻胶、步进压印式光刻胶和滚动压印式光刻胶的特点以及碳氧类纯有机材料、有机氟材料、有机硅材料做压印光刻胶的优缺点。列举了热压印、紫外压印、步进压印工艺中具有代表性的光刻胶实例,详细分析了其配方中各组分的比例和作用。介绍了可降解光刻胶的原理。展望了压印光刻胶的发展趋势。     

氟聚合物在丙烯酸酯核壳乳液及耐沾污外墙涂料中的应用

针对普通丙烯酸外墙乳胶涂料耐沾污性不足的缺陷,利用有机氟改性丙烯酸乳液,合成了壳层含氟的内软外硬型丙烯酸酯核壳复合乳液.并采用自制乳液配制了外墙乳胶涂料,研究了壳层含氟的乳液对外墙涂料耐沾污性的影响.结果表明:与不掺加有机氟的丙烯酸酯乳液相比,通过在壳层聚合时加入一定量的氟单体,核壳乳液涂膜的表面接触角和疏水性显著提高,漆膜吸水率明显降低,使得涂料的耐沾污性得到显著改善.由于氟组分主要分布于壳层,含量很少就可获得显著的改性效果.     

含氟聚合物挤出模具的选配与应用

对含氟聚合物挤出配模中出现的问题进行分析,通过设计合理的配模系数、合适的材料拉伸比以及选用合金模具来避免这些缺陷,从而达到挤出的理想要求。     

Towards new environmentally friendly fluoroelastomers: from facile chemical degradation to efficient photo‐crosslinkable reaction

Our objective is to develop a versatile and facile method that allows the synthesis of novel primary fluorinated co‐oligomers as precursors of photo‐crosslinkable networks. Transparent carboxyl‐terminated fluorinated co‐oligomers with molecular weights ranging between 2000 and 10 400 g mol^?1 were synthesized via facile degradation. The structural changes of fluorinated backbone were investigated using various analysis techniques. Then two major approaches, namely esterification and ring opening, were applied to obtain photochemical diacrylates (HEMA‐ and GMA‐IEM‐terminated co‐oligomers). These two precursors can be cured in 60 s under UV radiation without high temperature, high pressure or toxic solvent. The glass transition temperatures of HEMA‐ and GMA‐IEM‐terminated fluoropolymers at about ?20 °C, assessed from differential scanning calorimetry, showed an increase after crosslinking, and the glass transitions at 20 °C were no longer observed. These two crosslinked films were found to have higher decomposition temperatures, when compared to starting precursors. The contact angles on the surface of the two elastomer materials were only about 74° and 78°, which increased to 105° and 110° after UV irradiation. The tensile strength of the two cured fluoroelastomers can still reach 1.3 MPa at 200 °C. © 2019 Society of Chemical Industry