塑料用着色剂及其进展

该文阐述了塑料用着色剂的性能要求,目前使用的主要类型,特别对塑料用最重要的着色剂-有机颜料及其进展进行了分析,还介绍了几种重要塑料使用的着色剂.     

塑料着色剂

本文介绍了塑料着色剂具备的性能，着色原理，着色剂与树脂的相容性及其存在形式，主要着色方法，并对几类常用塑料的着色剂作了介绍。     

塑料着色剂特性及生产发展

本文综述了塑料着色剂的特性、种类、生产与应用情况。重点介绍塑料着色剂选用原则和主要品种，并提出国内今后发展趋势。     

塑料的着色

介绍各种塑料用着色剂必须具备的条件、塑料用着色剂的形态。ABS、聚笨乙烯、聚碳酸酯、聚甲醛、不饱和聚酯、氨基树脂、聚烯烃、聚氯乙烯的着色加工条件及性能影响因素,以及塑料用着色剂的选择。     

着色剂成为塑料制品安全卫生重要隐患

<正>塑料着色是塑料加工工艺中的重要环节。绚丽多彩、美艳夺目的塑料制品不仅丰富了市场,也美化了人们的生活,但不合格塑料着色剂的使用或着色剂的不当     

塑料着色剂耐热性研究

对着色剂在塑料加工中的耐热性进行了定量化的分析与研究,探讨着色剂在塑料加工中的热稳定性。     

塑料配色实践

简要介绍了塑料着色剂的基本要求，常用塑料着色剂的主要性能，干法着色的方法以及在塑料配色时影响目测颜色精度的主要因素、并列出了可用于聚烯烃着色的几种配方。     

欧洲塑料着色剂领军高端市场

据英国伦敦Frost＆Sullivan国际咨询公司发布的最新研究报告，近年来欧洲塑料加工企业为降低成本，纷纷将生产转向亚洲，在亚洲投资建厂呈增长态势，已对欧洲塑料母料和着色剂工业发展产生负面影响。但实际上，欧洲塑料着色剂工业目前仍在增长，特别是高价和高端产品如汽车部件着色剂等。亚洲着色剂企业生产的产品主要用于一般塑料制品，而高价和高端塑料制品为欧洲着色剂企业提供了机会。     

塑料着色剂（有机颜料与溶剂染料）的特性与进展（三）

该文较系统地讨论了作为塑料与树脂着色剂的有机颜料及溶剂染料,并重点介绍了塑料、树脂对着色剂性能的要求;适用于塑料主要类型的有机颜料;有机颜料制备物及有机-无机混合物;溶剂染料化学结构类型、特性;主要用途与适用于塑料、树脂着色的应用性能要求.     

塑料着色剂（有机颜料与溶剂染料）的特性与进展（二）

该文较系统地讨论了作为塑料与树脂着色剂的有机颜料及溶剂染料,并重点介绍了塑料、树脂对着色剂性能的要求;适用于塑料主要类型的有机颜料;有机颜料制备物及有机-无机混合物;溶剂染料化学结构类型、特性;主要用途与适用于塑料、树脂着色的应用性能要求.     

食品接触材料中初级芳香胺的迁移风险与法规管控

汇总了国内外法规、标准、技术指南和文献中与食品接触材料相关的41种初级芳香胺(PAAs),分析了食品接触材料中PAAs的来源和迁移风险,对比了2021年以前中国、欧盟、韩国等国家及地区PAAs相关技术法规的差异.研究发现,食品接触材料中PAAs主要来源于偶氮着色剂、芳香族异氰酸酯以及其他助剂;聚酰胺餐厨具、有色塑料制品...     

Microstructure and phase evolution of micronized ceramic colorants from a pilot plant for inks production

The advent of inkjet printing as digital decoration of ceramic materials has irreversibly modified the industrial decoration technology, imposing companies to change the colorant production process. The inkjet application requires micronized particles in the ultrafine particle size range (smaller than 1 μm). Particles size reduction of ceramic colorants is performed by a high-energy comminution process in wet-operated bead mills, affecting colorants properties. Since a deep knowledge of milling-induced microstructural changes is still lacking, the micronization effects on a set of five industrial ceramic colorants are thoughtfully investigated in this work by simulating the industrial process at a pilot plant. Particle size distribution and energy consumption are monitored during the comminution process. The compositional (including crystallite size and microstrain analysis of the main phases) and morphological variation of four ceramic pigments (yellow zircon, brown spinel, pink malayaite, and green eskolaite) and one dye (blue olivine) is investigated by XRPD (Rietveld method) and SEM analyses. The analytical approach combined with a physical/semiempirical modelling of the colorants elastic features versus the energy demand for particle reduction has yielded details on the nature of the micronization-induced microstructural changes in ceramic colorants. Specifically, the comminution efficiency as well as the crystalline phase stability are related to the intrinsic properties of each colorant. Brittle breakage rather than plastic deformation on comminution are also system dependent. When an euhedral to subhedral crystal habit is maintained a brittle fracture is preserved throughout the comminution progress, while the formation of flake-like particles and particle agglomeration are strong evidences of plastic deformation. The last evidence deals with the material elastic features. Materials with high bulk modulus convert the grinding energy to lattice defects that lead to particle breakage by brittle fractures, while materials with lower bulk modulus convert/dissipate part of the supplied energy in plastic deformations, drastically decreasing the comminution process efficiency.     

着色剂对PET树脂特性粘度的影响

依据色素分子的性质，将着色剂进行了分类，并以此为基础讨论不同着色剂对聚酯特性粘度的影响，通过Mark-Houwink公式，推导了着色剂的加入与聚酯特性粘度之间的关系，发现小分子染料会使聚酯特性粘度迅速下降，聚合染料基本不影响聚酯的特性粘度，而熔融活性着色剂在低浓度范围内对聚酯起着明显的增粘作用，不仅可提高着色牢度，还可以抵消由于热加工而引起的聚酯的热降解。     

Colorants based on renewable resources and food‐grade colorants for application in thermoplastics

A series of colorants based on renewable resources and food‐grade colorants have been evaluated for use in polypropylene (PP) and polyvinylchloride (PVC). It has been found that most of these colorants can be processed in PP at 200°C or even 260°C while maintaining good color intensity and color brightness. The colorants evaluated cover a large part of the color spectrum. In PP, the light stability of alizarin (red), carmine (red), indigo (blue), purpurin (red), quinizarin (red), and the aluminium lakes of quinoline yellow (yellow) and indigo carmine (blue) is close to the requirements for indoor applications. The blue colorants indigo and the aluminium lake of indigo carmine are, in principle, sufficiently light stable in PP for indoor applications. A few colorants showed bleeding from PP. Bonding of migrating colorants to the reactive carrier maleic anhydride grafted polypropylene, however, reduced bleeding of the colorant to a large extent. Also after processing in PVC at 200°C, good color intensity and saturation is maintained. Quinizarin, a structural analog of alizarin and purpurin, shows a light stability performance that is close to commercial lead chromate/molybdate orange based colorants. The best performing natural colorants are sufficiently heat and light stable for applications where moderate properties concerning heat resistance and (UV) light stability are required, such as underground PVC water drainage pipes and indoor PP applications. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2961‐2969, 2004     

The synthesis,photophysical and thermal properties of new anthrapyrimidine colorants

The thermal and photostability of novel anthrapyrimidine‐containing colorants obtained by the condensation of various substituted aromatic amines with 6‐bromo‐7H‐benzo[e]perimidin‐7‐one are described. The colorants were characterised by proton nuclear magnetic resonance, elemental analysis and mass spectra. Thermogravimetric analysis showed that these colorants are thermally stable up to 250 °C. The UV–visible absorption spectra of the colorants were studied in solvents of differing polarity; the colorants exhibited slight positive solvatochromism. The photostability studies in dimethyl sulphoxide solvent were recorded by monitoring photodegradation of the colorants spectrophotometrically using a standard calibration curve. All the colorants exhibited excellent photostability. The light fastness study of two colorants in polypropylene showcases their ability as useful colorants for plastics.     

Acetoacetanilide colorants: intramolecular bonding and their relationship with pyrazolone colorants

The possibility of C.H.O intramolecular bonds in acetoacetanilide colorants is considered. It is concluded that such bonds play an important part in keeping the molecular planar. A close relationship between the molecular configurations of acetoacetanilide and pyrazolone colorants is noted, and it is suggested that the printed representation of the former should be changed.     

The Coloration of Plastics

Although plastics can be coloured by various techniques, in the main they are mass-coloured with dyes or organic or inorganic pigments. Some of this colouring is done during manufacture, but a growing proportion is now carried out subsequently and even as late as when the plastic is being extruded or injection-moulded into its final form. The way in which colorants are selected for use with plastics and the problems that beset the colourist in preparing economical colour formulations of good performance are discussed.     

Encapsulation of colorants by natural polymers for food applications

Product appearance is an important factor for consumers when determining the quality of a product, and colour is one of the most important factors which contribute to product appearance. Currently, the safety and consumer acceptance of some colorants used in food products, such as titanium dioxide and some synthetic colorants, are under discussion. Therefore, new ways to use natural colorants as alternatives to these suspect colorants for future applications are being investigated. A promising method for increasing the applicability of the often sensitive natural colorants is the encapsulation of these colorants in colloidal particles by natural polymers such as carbohydrates, lipids and proteins. In recent years, micro‐ and nano‐encapsulation have increasingly been used for various purposes concerning several food properties such as colour, flavour and micronutrient content. This technique results in improved stability for the often sensitive natural colorants and presents the possibility of entrapping water‐insoluble colorants for improved use in an aqueous system. This paper reviews the main methods that are used for encapsulation by natural polymers, discusses the different types thereof that are used for encapsulation of colorants, and provides a short overview of natural colorants successfully encapsulated in these natural polymers.