浅谈防流挂增稠剂对水性木器涂料光泽的影响

验证了无机增稠剂、纤维素醚类增稠剂、碱溶胀丙烯酸型增稠剂、聚氨酯型增稠剂在水性木器涂料中的防流挂效果,对比了不同体系增稠剂对干膜涂层光泽的影响程度。结果表明:无机与纤维素醚类对涂层有消光作用;碱溶胀丙烯酸体系中不同品种、规格对光泽影响情况差别较大;聚氨酯类增稠剂对光泽影响最小,是制备水性亮光木器涂料的首选防流挂增稠剂。     

赢创AEROSIL~?气相二氧化硅分散液荣获“2020涂料行业——荣格技术创新奖”

正日前,赢创AEROSIL~?气相二氧化硅分散液VP Disp. WF 7620荣获了"2020涂料行业——荣格技术创新奖"。VP Disp.WF 7620是一款专为水性涂料体系开发的新型流变控制助剂,相比于其它传统增稠剂和流变控制剂,VP disp. WF 7620可轻松添加于水性涂料配方中,并表现出优异的流变性能,对色漆具有抗沉降作用,确保在各种施工条件下保持良好的抗流挂     

水性涂料流变助剂的作用机理及研究进展

介绍了水性涂料中流变助剂的种类、分子结构以及在体系中的增稠机理,以此探讨不同的流变助剂对涂料流变特性的贡献。并阐述了流变助剂作用于水性涂料的影响因素及相关的研究进展。     

水性无机富锌涂料用助剂的筛选及其对涂料分散稳定性的影响

在水性无机富锌涂料体系中,添加助剂可有效改善体系的稳定性,并对涂膜质量有一定影响,但不同助剂种类之间存在相互作用,对涂料体系稳定性、涂膜质量的影响各不相同,需全面考虑,不能顾此失彼。研究了水性无机富锌涂料中,分散剂、流变助剂、增稠剂的筛选及其相互作用,以及添加顺序对涂料体系分散稳定性的影响。     

水性木器涂料的干燥速度与相关因素讨论

水性木器涂料的干燥一直是困扰配方设计师的问题,水性木器涂料的干燥速度受到诸多因素的影响,包括外部环境的温度、湿度、空气流动速率和涂膜厚度,还取决于配方中成膜物质的某些特性,比如玻璃化转变温度和自交联性的影响,配方中的其他组分,比如某些具有保水性能的增稠剂、助溶剂和成膜助剂,以及用来和主漆反应的异氰酸酯等也会影响水性木器涂料的干燥速度。     

水性木器漆用混合型消泡剂及增稠剂流变性能的应用研究

水性木器漆受其自身的性质因素影响呈现出较强的特性,在应用过程中使得相较溶剂型涂料的流变性变差,并且消泡性降低,影响其使用效果。本文从水性木器漆用混合型消泡剂与增稠剂概述入手,深入进行分析,明确消泡剂的稳定性影响因素,并探索当前的增稠剂对水性木器漆的流变性能产生的影响,以供参考。     

水性无机富锌涂料助剂的筛选及其对涂料性能的影响

研究了水性无机富锌涂料中,润湿分散剂、流变助剂、附着力促进剂、防锈助剂的筛选及其相互作用对涂料体系分散程度稳定性及涂膜重防腐性能的影响。试验结果显示:分散剂、流变增稠剂的选择对涂料的抗沉降性、贮存稳定性有很大影响;偶联剂的选择添加对涂膜附着力、耐盐雾等性能提高有很大帮助;高性能防腐助剂石墨烯的添加对涂膜耐盐雾性能有质的提高。     

水性涂料中增稠剂的选择及其应用

增稠剂是调整水性涂料流变行为的一种重要助剂。本文概述了水性涂料用纤维素、聚氨酯、丙烯酸三大类增稠剂的增稠机理、特点及其使用,以期对涂料技术人员合理选择和使用增稠剂提供参考。     

助剂的选用对水性膨胀型防火涂料贮存性的影响

简单介绍了一种水性膨胀型防火涂料制备工艺,通过对配方中增稠剂、润湿分散剂及消泡剂等助剂对贮存稳定性的影响进行研究与讨论,结果表明:(1)不同种类增稠剂的选用会极大地影响水性膨胀型防火涂料的贮存稳定性,其中纤维素与聚氨酯类增稠剂搭配使用效果较好;(2)润湿分散剂中的表面活性成分能够有效改善粉料的分散,防止填料微粒的聚沉而影响贮存稳定性;(3)消泡剂能够控制微泡,改善填料微粒的分布情况,其中有机硅类消泡剂对高固体分涂料体系的长期稳定有显著的影响。     

流变增稠剂对溶剂型涂料黏度的影响

介绍了几种流变增稠剂的性能特点及其在溶剂型涂料中的作用,阐述了流变增稠剂对涂料黏度及触变性的影响。     

Tailoring HASE rheology through polymer design: Effects of hydrophobe size, acid content, and molecular weight

Hydrophobically modified alkali-soluble emulsion (HASE) polymers are an important class of rheology modifiers for waterborne coatings applications. They are typically prepared as terpolymers by emulsion polymerization of ethyl acrylate (EA), methacrylic acid (MAA), and an associative macromonomer. The viscosity development and shear responses of HASE solutions depend on a number of factors. This article presents rheological data reflecting the impacts of three key variables: hydrophobe size, acid content, and molecular weight, on model HASE thickening and rheological performance. The relative contributions of hydrophobic association, chain expansion, and polymer chain length are discussed. In steady shear flow, all thickener solutions approached some constant low-shear viscosity at small deformation rates. At the same molar composition, larger hydrophobe size resulted in higher viscosity development and greater shear thinning behavior. The amount of acid monomer in HASE polymers can influence the balance between hydrophobic attraction and electrostatic repulsion forces. It was found that a minimum of 15 wt% MAA was required to effect dissolution and thickening of the model HASE polymers. Increasing the MAA level yielded higher zero-shear viscosity and storage modulus G’ with maximal values being obtained at 40% MAA. The molecular weight of the model thickeners was controlled by the amount of chain transfer agent (CTA) added during polymerization. When the CTA level was below 0.1 wt% based on total monomers, the polymer solutions displayed shear-thinning behavior. A small increase in CTA concentration beyond 0.1% resulted in a dramatic change to Newtonian flow, and the solution viscosity was nearly two orders of magnitude lower. The model thickeners were also tested in a vinyl acrylic architectural paint formulation. The effects of each individual factor on paint thickener efficiency, high-shear, and low-shear properties are discussed and compared with solution rheology for predictive relationships. Presented at the 81st Annual Meeting of the Federation of Societies for Coatings Technology, November 11–12, 2003, in Philadelphia, PA.     

Influence of fluorinated segments of variable length on the thickening properties of a model HASE skeleton

Introduction of fluorocarbon segments in an associative thickener copolymer (ethyl acrylate (EA)/methacrylic acid/macromonomer) was achieved by the substitution of EA with either trifluoroethyl acrylate, 2‐perfluorobutylethyl acrylate, or 2‐perfluorooctylethyl acrylate. The thickening properties were evaluated by rheological flow experiments in aqueous medium as well as in 10 wt % of sodium dodecyl sulfate (SDS) aqueous solution. Whereas in the literature no particular attention is devoted to the impact of the ethylene moieties in hydrophobically modified alkali‐soluble emulsion (HASE) skeleton, our study reveals they contribute significantly to the performances when modified by an incompatible fluorocarbon segment. Moreover, the synthesis process has a huge influence by inducing a specific distribution of the fluorinated acrylates in the macromolecule. The amount of substitution is also important and even 20 mol % of EA substituted reveals a great impact on the rheological properties of the copolymer solutions. Whereas an SDS aqueous medium generally destroys almost all the hydrocarbon interactions from the macromonomer, the total replacement of ethyl groups by trifluoroethyl groups with a cosolvent process, leads to emulsions with an equivalent thickening effect than the reference hydrocarbon HASE used. This result is quite encouraging for research work on the synthesis of HASE with increased biocompatibility. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

凹凸棒土在水性丙烯酸木器涂料中的应用研究

研究了水性丙烯酸木器涂料中凹凸棒土与增稠剂HEOVIS PU 1191、RHEOVIS HS 1152、RHEOVIS HS 1212、RHEOVIS PE 1331的协同效应,并与使用单一增稠助剂的涂料进行性能对比。结果表明:凹凸棒土的协同作用能使增稠剂1191的防沉效果提升28.6%,用量减少0.5%;能使增稠剂1152的防沉效果提升65.7%,用量减少0.5%以上;能使增稠剂1212的防沉效果提升10%,用量减少0.4%以上;能使增稠剂1331的防沉效果提升57.1%,用量减少0.5%。凹凸棒土与增稠剂1191、1331协同作用使涂料具有更好的触变性。凹凸棒土的协同作用较使用单一增稠剂更能提高水性丙烯酸木器涂料的贮存稳定性。     

Addition of Urethane-Based Thickener to Waterborne Polyurethane Adhesives Having Different NCO/OH Ratios and Ionic Groups Contents

Several waterborne polyurethane adhesives containing different hard-to-soft segment ratios and ionic groups were prepared by using the acetone process. To improve the rheological properties, a 5 wt% of hydrophobically-modified ethoxylated urethane-based thickener (HEUR) was added. The adhesives were characterized by shear rate-controlled rheology, pH, particle size measurements, solids content and laser confocal microscopy. The adhesive films were characterized by plate–plate rheology, dynamic mechanical thermal analysis (DMTA) and differential scanning calorimetry (DSC). The adhesion properties were measured using T-peel tests of leather/thickened polyurethane adhesive/SBR rubber joints. The addition of the HEUR thickener produced an improvement in rheological properties of polyurethane adhesive dispersions as a result of the physical interactions between the polyurethane particles and the thickener. The addition of the HEUR thickener markedly increased the viscosity of the polyurethane adhesives, as the hard-to-soft segments ratio decreased and the ionic groups content in the polyurethane increased. As the hard segment content of the thickened polyurethane adhesive decreased, the kinetics of crystallization was favoured as a result of stronger polyurethane/thickener interactions. As a result, an improvement in the adhesive strength in the leather/thickened polyurethane adhesive/SBR rubber joints was obtained.     

Effect of annealing on the properties of waterborne polyurethane adhesive containing urethane-based thickener

Different amounts of hydrophobically modified ethoxylated urethane-based thickener (HEUR) were added to improve the rheology of waterborne polyurethane adhesives. The thickened solid adhesive films were thermally annealed and characterised by IR spectroscopy, plate–plate rheology, dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Hydrogen bonds played a key role in the thickening mechanism of polyurethane dispersions containing urethane-based thickener, along with ionic adsorption and micelles formation between hydrophobic groups. The adhesion properties were measured from T-peel test of leather/polyurethane adhesive/vulcanised styrene-butadiene rubber joints. Optimal results were obtained when water in the waterborne polyurethane adhesive (just before joint formation) was removed under open air, while forced air drying impeded the complete removal of water. On the other hand, the thermal annealing did not greatly affect the rheological and thermal properties of the thickened polyurethanes.     

Addition of different amounts of a urethane-based thickener to waterborne polyurethane adhesive

To adjust the rheology of waterborne polyurethane adhesives, different amounts of a hydrophobically modified ethoxylated polyurethane thickener (HEUR) were added. The thickened adhesive solutions were characterized by flow rheology, pH measurements, particle size, solids content and confocal microscopy. The thickened solid adhesive films were characterized by IR spectroscopy, plate-plate rheology, dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC) and thermogravimetric (TG) analysis. The adhesion was measured from T-peel test of plasticized PVC/polyurethane adhesive/plasticized PVC and leather/polyurethane adhesive/SBR rubber joints. The addition of the HEUR thickener increased the viscosity of the polyurethane dispersion, and a shear-thinning behaviour was observed due to polyurethane–thickener interactions. The addition of thickener improved the rheological properties of the polyurethane, more noticeable as the content of the thickener increased. The crosslinking of the thickened polyurethane was studied by confocal microscopy. Although the addition of the thickener did not greatly affect the thermal properties of the polyurethane, an improvement in the adhesive strength of leather/adhesive/SBR rubber joints was obtained.     

工程机械用水性环氧防锈底漆的制备

采用水性环氧树脂乳液作为基料,水性改性胺作为固化剂以及环保型助剂等配制成双组分水性环氧防锈底漆。讨论了水性环氧固化剂、活性防锈颜料、流变剂及活性稀释剂对水性环氧防锈底漆性能的影响。     

Associative polymer/latex dispersion phase diagrams II: HASE thickeners

The colloidal interactions of HASE associative polymers and latexes in the presence of surfactant are complicated and subject to a number of variables. Both bridging and depletion flocculation can occur, in addition to good particle dispersion. Dispersion phase diagrams have been developed to help visualize these interactions. The various dispersion states can have a significant effect on coating formulations and film properties. Examples of dispersion phase diagrams are presented for a model HASE anionic associative thickener and various model latexes in the presence of sodium dodecyl-sulfate and nonionic surfactants. The major variables affecting dispersion behavior are associative polymer concentration, latex particle size, latex surface hydrophobicity, electrolyte concentration, and surfactant concentration. The dispersion phase behavior of the HASE systems is compared to that of HEUR thickened systems reported previously. A significant difference is that much less bridging flocculation is observed in the HASE systems. In addition, nonionic surfactants induced depletion flocculation in the HASE systems but not in the HEUR systems.     

Further studies on the rheological properties of hydrophobically modified polyelectrolyte systems: effect of varying degree of ethoxylation

The rheological properties of aqueous solutions of a series of hydrophobically modified alkali‐soluble emulsion (HASE) polymers containing hydrophobic macromonomer with varying number of ethylene oxide (EO) units were examined. The viscosity of a 3 wt% HASE solution increased from 0.06 to 300 Pa s when the number of EO units changed from 0 to 30, and then decreased to 4 Pa s for 40 EO units. The formation of a network structure in the HASE polymer systems is caused by association of hydrophobic moieties in the solution rather than by physical chain entanglements. Two different associating mechanisms, namely the backbone and the multiple center associative mechanisms, are proposed for the HASE polymer with varying number of EO units. The backbone associative mechanism is applicable to HASE polymers with short EO spacer where the hydrophobic association is hindered by electrostatic repulsion on the backbone. In contrast, with longer EO spacer, hydrophobes from different polymer chains are able to associate, leading to the formation of multiple center associative junctions. The drastic reduction in the viscosity for 40 EO units in both dilute and semi‐dilute concentrations is attributed to the formation of a higher proportion of intramolecular associative junctions. Copyright © 2006 Society of Chemical Industry     

水性UV涂料的制备及在木器上的应用

采用平行实验的方法,采用异佛尔酮二异氰酸酯(IPDI)和聚醚二醇反应,引入—COOH基团,加入胺中和得到水性UV树脂,并制备水性UV涂料,讨论了长链二元醇和中和剂的选择对于产品性能的影响。介绍了水性UV涂料在家具和木材领域应用实例,并给出了常用施工工艺,具有一定实用价值。