热交联剂在UV固化油墨中的临界值研究

在UV固化油墨中添加一定数量的热交联剂会改变油墨的干燥性能,当热交联剂含量超过一定值时,即使增加紫外线照射时间,墨膜也不会彻底干燥;反之墨膜的干燥性能不会发生变化,与之对应的热交联剂的含量称为临界值.研究了热交联剂在EA系列UV固化油墨中的临界值问题.该临界值的发现是研制一种新型热成型UV固化油墨的关键点.     

功能材料热交联剂对UV固化油墨干燥性能的影响

在UV固化油墨中添加一定数量的热交联剂会改变UV油墨的干燥性能，研究了热交联剂对油墨干燥性能的影响。结果表明当热交联剂含量超过一定值时，即使增加紫外线照射时间，墨膜也不会彻底干燥；反之墨膜的干燥性能不会发生变化，与之对应的热交联剂的含量称为临界值。找出了热交联剂在PUA系列UV固化油墨中的临界值。该临界值的发现是研制一种新型热成型UV固化油墨的关键点。     

水性 UV 油墨的制备及表征

目的为了确定水性UV油墨的制备、表征及其配方。方法采用高速分散法将连接料、颜料、去离子水和助剂分散均匀即可制得水性UV油墨,探讨了连接料的含量、光固化时间对水性UV油墨附着牢度的影响,以及光引发剂用量、墨膜厚度对墨膜光固化时间的影响。结果连接料的较佳质量分数为60%,墨膜的适宜固化时间为6 s,光引发剂的较佳用量为2%,墨膜的适合厚度为10μm。当m(连接料)∶m(颜料)∶m(乙醇和水)∶m(光引发剂)=6∶1∶2.8∶0.2时,水性UV油墨的综合性能较佳。结论该水性UV油墨具有干燥速度快、无污染、印刷质量高等优点,可广泛应用于包装印刷行业。     

溶剂负载摩擦法评价UV胶印油墨印品固化程度

目的 UV油墨固化程度是印品质量的关键影响因素,开发新型UV油墨固化程度评价方法,用以准确、直观地判断墨层固化程度,指导印刷工艺条件优化。方法 通过调控墨层的UV固化光能量,制备系列不同固化程度的胶印印品,以间歇红外法测定墨层的双键转化率定量分析固化交联反应的程度,进一步以墨层在不同溶剂下的摩擦次数建立墨层固化等级的评价方法。结果 不同UV固化能量下的样品,具有不同的双键转换率,依据不同比例的乙醇与水混合溶剂下的印品耐磨次数可以判定出印品的固化程度。结论 采用溶剂负载摩擦法主观经验判定依赖性低,可实现对UV油墨印品的整体油墨固化程度进行判定,具有良好的生产应用价值。     

助剂对水性UV光油性能的影响

改变助剂种类和用量制备水性UV光油,在铜版纸上涂布具有一定厚度的膜层测试其光泽度;在胶印墨膜和水性凹印墨膜上涂布,测试光油与墨膜的润湿接触角大小。探讨助剂种类和用量对水性UV光油流平性和基材润湿性的影响。结果表明,助剂种类和用量均对光油性能有较大的影响,选择适合体系的助剂种类和用量,可以提高光油的流平性和基材润湿性。     

基于钢管标识用UV油墨的研制

研制了钢管标识用UV油墨,通过探讨预聚物、单体、光引发剂组分对UV油墨粘度、固化速度、附着力和柔韧性能的影响,研究得出了最佳油墨配方(质量分数)为:PUA-2为29.8%,AR为37.3%,HDDA为16.10%,YFJ-S为2.20%,分散剂为2.7%,TiO2为6.4%,消泡剂为1.3%。该条件下配制的油墨粘度为1.8Pa.s,固化时间60 s,附着力等级为3级,柔韧性好,是一种性能优异的钢管标识印刷用UV油墨。     

UV油墨

UV油墨,顾名思义,是一种特别配方的油墨,利用紫外线(ULTRAVIOLET)光波感光作用,使墨成膜和干燥。UV墨干燥和成膜的机理,是一种化学的变化。利用不同的紫外线光谱(Ultraviolet Spectrum),产生不同的能量而将不同的预聚物(Oligomer)和不同的单体(MONOMER),聚合成聚合物(POLYMER)。所以UV墨的色膜,具有良好的机械性和化学性。UV油墨和传统油墨的比较优势 一般来说,UV干燥油墨较之传统溶剂型或环氧型油墨具有较大的耐磨性。最好的例子是电脑键盘上每个键上的符号,它们都是由UV油墨印刷的。有一个有名的大公司曾做过实验,用一个机械“手指”重复地对UV油墨印刷的键盘和传统的油墨印刷的键盘进行敲打,结果传统油墨印刷的键盘符号在大约1-2百万次就磨损了,而UV油墨印刷的键盘符号在大约13百万次才出现磨损。UV油墨的耐磨性是传     

可UV固化的超支化聚氨酯丙烯酸酯的合成与表征

通过两步法合成了可UV固化的超支化聚氨酯丙烯酸酯(HBUA).用SEC、FT-IR、1H-NMR和TG对HBUA进行表征,并测试了其UV固化膜的机械性能.结果表明:HBUA的分子量分布系数为2.31,丙烯酸端基改性程度为79.8%.HBUA的粘度较低有利于混合及涂布.UV固化膜具有高的硬度和良好的柔韧性.     

聚丙二醇分子量对聚氨酯在油墨中应用性能的影响

目的 研究具有良好应用前景的醇溶性聚氨酯油墨,并探究聚氨酯单体的分子量所合成的连接料对油墨印刷适性和触变性的影响.方法 采用扩链反应和预聚合的方法,以甲苯二异氰酸酯(TDI)、聚丙二醇(PPG,数均分子量Mn为1000,1500,2000,3000,4000)和扩链剂2,2-二羟甲基丙酸(DMPA)为原料,合成一系列醇溶性聚氨酯(PU1000,PU1500,PU2000,PU3000,PU4000),用傅里叶红外光谱(FTIR)和凝胶渗透色谱(GPC)对其结构进行定性分析.研究不同分子量PPG合成的聚氨酯作为连接料对油墨的粘度、细度、印刷适性、油墨的稳态剪切粘度和触变性的影响.结果 不同分子量PPG合成的聚氨酯连接料对油墨的各项性能有重要影响,随着PPG分子量的逐渐增大,油墨的粘度、细度和稳态剪切粘度先增大后减小.当Mn=1500时,所合成聚氨酯制备的油墨综合性能最佳,油墨粘度为880 MPa?s,细度为5μm,析油率为5％,具有良好的印刷适性(附着力为93％,初干性为84 mm/s,光泽度为37),油墨在15s的结构回复率为94.47％,触变性良好.结论 将所合成的聚氨酯作为连接料,在油墨中具有较好的应用前景.     

简谈UV油墨的使用

UV油墨是近年来迅速发展的一种环保型油墨,它以瞬间固化(干燥)、不含挥发性溶剂、应用简单方便等迅速占领市场。UV油墨包括UV磨砂、UV冰花、UV发泡、UV皱纹、UV凸字、UV折光、UV宝石、UV光固色墨、UV上光油等特种包装油墨。在具有金属镜面光泽的承印物表面,采用丝网印刷工艺手段将UV油墨印在其表面上,经紫外线于燥设备光照处理后,产生一种别具一格的视觉效果,显得高雅、庄重、华贵。产品主要应用于高档、精美别致的烟、酒、化妆品,保健品、食品、药品等包装印刷。一、UV油墨1.组成UV油墨就是在UV光照射下,发生交联聚合反应,瞬间固化成膜的油墨。它主要由光聚合性预聚物、感光性单     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.