五辊式无溶剂涂布系统交叉耦合建模与设计方法

 针对五辊式无溶剂涂布头多辊速比控制精度设计需求,提出了基于多电机协调控制的机电耦合建模及设计方法.设计一种交叉耦合定速比控制算法,即通过3个独立的补偿速度PID控制器分别实现3个同步电机对其中三辊速度期望均值的动态输出特性的实时跟踪控制,从而实现涂布辊、橡胶转移辊及计量辊的精确定速比控制.以400 mm规格的涂布试验机为应用实例的涂布头系统仿真分析结果表明：控制方法具有鲁棒性和快速跟踪性,控制系统抗干扰能力强、可靠性好;在五辊负载时变的情况下,各速度比误差率在0.4 s之内降低在5%之下,在2 s之后各速度比误差率均小于0.6%,系统稳定运转,且无明显跳动.     

耐高温无溶剂绝缘浸渍漆的研究

合成了以间苯二甲酸二烯丙酯（DAIP）为主体、环氧丙烯酸酯（VE）为改性剂的耐高温无溶剂绝缘浸渍漆，用DTA分析了漆液的反应特性，讨论了DAIP的预聚、VE含量等因素的对漆液、浇铸体性能的影响，并对漆的常规性能进行了测试。与同类产品相比，研制无溶剂绝缘浸渍漆耐热性高、电性能好、成型工艺性优异、综合性能佳、单组分供货、室温使用期长。     

Solventless dry powder coating for sustained drug release using mechanochemical treatment based on the tri-component system of acetaminophen,carnauba wax and glidant

Objective: Solventless dry powder coating methods have many advantages compared to solvent-based methods: they are more economical, simpler, safer, more environmentally friendly and easier to scale up. The purpose of this study was to investigate a highly effective dry powder coating method using the mechanofusion system, a mechanochemical treatment equipped with high compressive and shearing force.Materials and methods: Acetaminophen (AAP) and carnauba wax (CW) were selected as core particles of the model drug and coating material, respectively. Mixtures of AAP and CW with and without talc were processed using the mechanofusion system.Results: Sustained AAP release was observed by selecting appropriate processing conditions for the rotation speed and the slit size. The dissolution rate of AAP processed with CW substantially decreased with an increase in talc content up to 40% of the amount of CW loaded. Increasing the coating amount by two-step addition of CW led to more effective coating and extended drug release. Scanning electron micrographs indicated that CW adhered and showed satisfactory coverage of the surface of AAP particles.Conclusion: Effective CW coating onto the AAP surface was successfully achieved by strictly controlling the processing conditions and the composition of core particles, coating material and glidant. Our mechanochemical dry powder coating method using the mechanofusion system is a simple and promising means of solventless pharmaceutical coating.     

α-硅烷封端杂化聚合物制备高性能无溶剂涂料

介绍了α-硅烷封端杂化聚醚的固化机理,及其涂料的配方、生产工艺及施工应用。性能测试结果表明:α-硅烷封端杂化聚醚配制的涂料具有优异的综合性能及环保性能。     

绝缘材料用无溶剂超支化聚合物的制备

阐述了绝缘材料用无溶剂树脂的合成方法,分析了超支化环氧树脂、超支化聚酰亚胺、超支化有机硅树脂和超支化不饱和树脂的合成方法、原理、结构及官能团与粘度的变化关系.结果表明,超支化聚合物的支化度、活拨氢含量、乙烯基含量或环氧基团含量、甲基含量、亚胺基含量均对其粘度有影响.     

On the UV Curability and Mechanical Properties of Novel Binder Systems Derived from Poly(ethylene terephthalate) (PET) Waste for Solventless Magnetic Tape Manufacturing, 2. Methacrylated Oligoesters

Recycling of poly(ethylene terephthalate) PET waste by chemical methods is a well‐known process that generates value‐added products. Depolymerization products of PET recycling were commonly applied as starting materials for the synthesis of polyurethanes, saturated and unsaturated polyester resins. In this current work we are reporting on a novel application of the depolymerized products obtained by glycolysis of PET by converting the hydroxyl functional groups to methacrylate groups. The obtained methacrylated oligoesters were tested for UV curability by UV irradiation, in the presence of 2‐benzyl‐2‐dimethylamino‐1‐(4‐morpholinophenyl)‐1‐butanone (BDMB) as a photo initiator. This gave cured films of high mechanical properties when these methacrylated oligoesters were either cured alone or as mixtures with other commercially available diacrylate/dimethacrylate monomers. The measured tensile properties were in the range of 7.21–43 MPa for maximum tensile strength and 0.90–3.0 GPa for Young's modulus.     

5-Hydroxy fatty acid amides from δ-lactones and alkyl glucamines

δ-Lactones derived from unsaturated fatty acids are useful precursors to fatty amides due to their enhanced reactivity. Consequently, temperature-sensitive glucamines were easily converted to their 5-hydroxy fatty acid amides in high yield (52–97%) by reaction with C₁₈ and C₂₀ δ-lactones. High yields of amides (52–97%) were obtained with little or no solvent at 90°C in less than 24 h. C₁₈ δ-lactones were more miscible in the glucamine than the C₂₀ δ-lactones and thus increased reaction rates and yields of amides. In addition, amidation reactions run in the absence of catalyst gave good yields, whereas reactions in the presence of base catalysts completely inhibited the reaction. The 1-(N-alkyl-5-hydroxy fatty acid amido)-d-glucitols are expected to have useful properties as biodegradable components in detergents.     

有机硅改性不饱和聚酯树脂的制备及应用研究

在不饱和聚酯合成后期加入含有不饱和双键和乙氧基的有机硅预聚体,通过缩合反应制备有机硅改性不饱和聚酯树脂,并用红外,核磁等方法进行了表征。研究结果表明,该树脂耐热性好,表观分解温度达320℃,高低温电气性能优良。     

纳米氧化铝改性无溶剂绝缘漆耐电晕性能的研究

为了改进一种聚酯亚胺无溶剂绝缘浸渍漆的耐电晕性能,加入自制的纳米氧化铝改性。对漆膜的介质损耗tanδ测试表明,随着纳米氧化铝含量的增加,漆膜的介质损耗逐渐升高;用自制的耐电晕测试设备对改性漆膜的耐电晕时间进行测试表明,改性后漆膜耐电晕时间明显提高;通过扫描电镜观察表明,纳米氧化铝粒子很均匀的分散于绝缘漆中;但纳米氧化铝对漆的粘度和漆膜的韧性有一些不利影响。     

软包装无溶剂复合工艺及牢度规律研究

目的 研究软包装无溶剂复合膜制品的生产条件,通过剥离强度分析复合牢度规律,从而优化生产工艺、提高产品质量。方法 通过控制无溶剂复合过程中工艺条件,分别制备干轻包装BOPP/CPP组合、水煮包装PET/PE组合、蒸煮包装BOPA/RCPP组合无溶剂复合膜,研究胶黏剂涂布量与复合速度对样品剥离强度的影响规律。结果 在实验条件范围内,所制备无溶剂复合膜样品的剥离强度随涂布量的增加而逐渐增大,分别在涂布量为1.0、1.2和1.6 g/m²时,剥离强度能够达到国标要求;而复合速度对强度的影响较小,复合速度为450 m/min时的剥离强度与复合速度为100 m/min时的剥离强度相比,降低率在20%以内,远低于涂布量的影响。耐热性与耐高温介质性实验结果说明,通过回归计算,水煮包装PET/PE组合与蒸煮包装BOPA/RCPP组合分别在涂布量达到1.19 g/m²和1.73 g/m²后,高温加热能够进一步促进胶黏剂固化反应,从而使剥离强度反高于水煮或蒸煮之前。结论 针对上述3种复合软包装类型,无溶剂复合工艺能够在一定涂布量与复合速度范围...