紫外光固化有机硅防粘隔离剂的研制

介绍了一种紫外光固化有机硅防粘隔离剂制造方法，研究了配方特性，并简要说明了其性能和用途。     

有机硅隔离剂的进展

概述了压敏胶带工业常用隔离剂的主要品种,隔离剂的作用原理,已有的有机硅隔离剂的概况,以及作者研制、开发的关于硅丙乳液隔离剂和UV固化硅丙无溶剂隔离剂的研究概况。     

UV固化涂料的现状和光引发剂的开发

介绍了辐射固化技术的应用和发展，概述了光引发剂的作用机制，发展历史及在辐射固化涂料中的地位。     

有机硅离型剂的应用研究进展

在总结有机硅离型剂的结构与性能以及固化反应机理的基础上,概述了近年来传统溶剂型、乳液型和无溶剂有机硅离型剂的应用研究进展,并介绍了紫外光固化、电子束固化和氟硅等新型有机硅离型剂,最后对有机硅离型剂的发展方向和前景进行了展望.     

含乙烯基有机硅树脂的电子束固化行为研究

以八甲基环四硅氧烷、四甲基四乙烯基环四硅氧烷为单体,六甲基二硅氧烷为封端剂,碱胶为催化剂,合成了含乙烯基有机硅树脂;并研究了电子束辐射剂量对其固化行为的影响和固化涂层的热性能。红外谱图及凝胶率测试结果表明,有机硅树脂中的碳碳双键吸收峰强度随辐射剂量的增加而减弱,辐射诱导交联网络结构的形成导致固化涂层的凝胶率随剂量的增加而显著增加;辐射剂量为30 kGy时,凝胶率为46.2%;辐射剂量增加至60 kGy时为70.1%和100 kGy时为85.9%。差示扫描量热分析和热质分析结果表明,固化涂层具有优良的耐低温性和热稳定性。     

信息荟萃

2006301 没有泡沫的无溶剂辐射固化 Byk-Chemie研究开发实验室推出了一种无溶剂辐射固化体系用不含有机硅的消泡剂——“Byk-1790”,它是一种破泡聚合物的混合物,专门开发用于UV和EB系统,它能在配有颜料和无颜料的2种系统消泡,此种助剂的高效能不会因颜料、填料、蜡助剂或消光剂而削弱,它完全符合欧共体     

研究与述评

200707187多官能自由基光引发剂;200707188钢结构防火涂料现状及其发展趋势;200707189浅谈隐身涂料技术应用特性与研究发展方向;200707190水性氟涂料简介;200707191有机硅系杂化涂料及其辐射固化.     

有机硅隔离剂的制备及应用研究进展

阐述了近年来开发的一些新型有机硅隔离剂的制备方法，介绍了有机硅隔离剂的应用，指出了今后有机硅隔离剂的研究方向。     

辐射固化涂料

将一种有机聚硅氧烷（其硅烷主链由环氧基封端）与氟代烷氟磷酸盐或二芳基碘绘盐六氟锑酸盐（作为光生酸剂）复配，制得一种辐射固化有机硅涂料。该涂料从压敏性粘合层中释放防污剂且释放性优异，对底材的附着力强。     

紫外光固化光纤内层涂覆材料的合成研究

采用有机硅MQ树脂与巯丙基硅油共混聚合的方法制备出新型UV光固化光纤涂料，研究了基体组成、引发剂、稀释剂以及固化工艺对UV光固化光纤涂料的光固化速度的影响．     

2007-2008年国外环氧树脂工业进展

综述了国外环氧树脂工业2007-2008年市场需求,公司经营,原料(甘油法环氧氯丙烷)生产和新产品(环氧树脂、固化剂、水性脱模剂等助剂和填料)开发情况并介绍了环氧树脂应用领域如胶粘剂、涂料、光固化产品和复合材料(如风力发电机叶片配套产品)的发展。     

脲醛树脂的复合固化剂体系及其固化特性研究

以NH4Cl为固化剂胶接的木制品在回收燃烧过程中会产生剧毒物质二噁英.本文结合固化剂存在下中密度纤维板的内结合强度、游离甲醛释放量、耐水解性等指标的评价,对某种新型复合固化剂存在下脲醛树脂的固化特性进行了探究,结果表明:与NH4Cl固化剂相比,新型复合固化剂存在下,脲醛树脂的游离甲醛释放量更低,化学结构更稳定,耐水解性...     

邻苯二甲酸二丙烯酯的固化及其反应动力学

利用FTIR研究了邻苯二甲酸二烯丙酯(DAOP)在高温条件下的固化反应,采用DSC研究确定了2,3-二甲基-2,3-二苯基丁烷(DMDPB)/邻苯二甲酸二烯丙酯(DAP)体系的固化行为及其动力学参数。结果表明:DMDPB可在180~210℃下引发DAOP树脂的固化反应,且体系固化过程中放热平缓;DMDPB用量为2%时,体系的凝胶温度、固化温度、后处理温度分别为:173.19℃、195.72℃、209.20℃;其表观活化能为93.488 kJ/mol,反应频率因子为1.02×1010,表观反应级数为0.9223。     

Low formaldehyde emission particleboard panels realized through a new acrylic binder

The effectiveness of acrylic resins as low formaldehyde emission binders for particleboard production was explored. In particular, a multifunctional methacrylic monomer, ethoxylated bisphenol A dimethacrylate, classified as nonskin and eyes irritant, was selected and tested. In comparison panels realized with classic urea‐formaldehyde (UF) binder were also prepared. No significant differences were found through the morpholocigal analysis of samples prepared with the two different binders. Moreover, particleboard panels realized with the acrylic binder showed better mechanical properties and lower water absorption and thickness swelling in comparison with corresponding panels realized with the UF binders. Furthermore, the replacement of the UF with the acrylic binder did not affect thermal insulation properties of the panels. Formaldehyde release tests revealed that particleboard panels obtained by applying the acrylic binder can be classified as E1 following the European classification and even F**** following the stricter Japanese classification. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

聚硫橡胶对环氧树脂固化动力学及力学强度的影响

用红外光谱分析了在环氧树脂中加入聚硫橡胶的固化及增韧过程,通过差示扫描量热法研究了增韧体系的反应动力学,探讨了聚硫橡胶用量对固化产物力学强度的影响,并对试样断口形貌进行了扫描电镜观察。结果表明,聚硫橡胶的加入降低了环氧树脂的表观活化能而没有改变反应级数,使得固化反应的总放热量减少、放热过程更加平均。聚硫橡胶对环氧树脂的增韧效果明显,二者通过化学键结合,韧性撕裂的冲击断面形貌验证了这种活性增韧。当聚硫橡胶用量为30份(质量)时,环氧树脂固化物的冲击强度可达到未增韧者的896%。     

A novel rapid cure epoxy resin with internal mold release

Mold preparation, material layup, and cure times for thermoset-based composites often limit their use in high-volume applications. As such, new rapid cure epoxy resins are being developed to achieve a complete cycle time within 3 min. In this research, calorimetry and rheometry are used to examine and model two novel rapid cure epoxy resin systems with internal mold release. The rapid cure epoxy resins followed an autocatalytic cure kinetic and William–Landel–Ferry diffusion model. The rapid cure epoxy resin was shown to achieve 94% cure in 2 min at 150°C. However, adding an additional 2.5 wt% internal mold release hindered the first step of the reaction, which delayed the second reaction step since the final degrees of cure were similar. Furthermore, the resin viscosity followed a modified William–Landel–Ferry equation and at 120°C could maintain a viscosity below 5 Pa s for 4.1 min. These models provided valuable insight into the range of processing conditions these novel resins could experience during impregnation and molding processes.     

Synthesis and properties of a novel bio‐based benzoxazine resin with excellent low‐temperature curing ability

A novel bio‐based benzoxazine resin (diphenolic acid/furfurylamine benzoxazine resin, PDPA‐F‐Boz) was prepared by using bio‐based diphenolic acid, furfurylamine and paraformaldehyde as raw materials. The structure of DPA‐F‐Boz monomer was characterized by Fourier transform infrared spectroscopy, ¹H NMR and ¹³C NMR, and then its curing reaction and the thermal stability of the cured PDPA‐F‐Boz were analyzed. Compared with the traditional fossil‐based benzoxazine (bisphenol A/aniline benzoxazine, BPA‐A‐Boz) and the bio‐based benzoxazine (diphenolic acid/aniline benzoxazine, DPA‐A‐Boz), DPA‐F‐Boz monomer showed the lowest curing temperature, and PDPA‐F‐Boz had the highest residual char ratio at 800 °C and the lowest degradation rate at the peak temperature. Meanwhile, the total heat release, peak heat release rate and heat release capacity of PDPA‐F‐Boz were much lower than those of PBPA‐A‐Boz and PDPA‐A‐Boz. Thus, PDPA‐F‐Boz showed excellent low‐temperature curing ability and thermal stability. © 2019 Society of Chemical Industry     

环氧树脂/聚酰胺/DDM体系的固化行为及力学性能

通过非等温DSC法及拉伸性能测试研究了4,4'-二氨基二苯基甲烷(DDM)用量对环氧树脂/聚酰胺651体系的固化反应的影响,计算了固化反应的表观活化能和反应级数,确定了其胶粘剂体系的固化工艺参数。结果表明,胶粘剂中DDM的质量分数达到14%(以环氧树脂质量为基准)时,固化反应放热量达到最大值。固化体系的活化能为53.654 kJ/mol,反应级数为0.895。最佳起始固化温度为40℃,峰值温度为85℃,终止温度为120℃,体系的拉伸强度提高了约50%。     

自蔓延光固化树脂及其碳纤维复合材料光固化行为

设计了自蔓延光固化树脂体系,并以此为基体制备了UV光固化碳纤维布增强的复合材料。研究了不同组成树脂的自蔓延光固化行为。结果表明,光引发剂和热引发剂相互配合使用可以实现环氧树脂的自蔓延光固化,其中热引发剂可以是自由基也可以是阳离子引发剂,阳离子引发剂比自由基引发剂更容易诱发自蔓延固化。以自蔓延光固化树脂为基体制备的碳纤维布增强的复合材料可以实现快速光固化,其固化过程是树脂的二维平面自蔓延过程。