UV固化聚丙烯酸系水性木器涂料的合成与性能

研究了一种使用双烯单体来制备水性光固化木器涂料的方法。此方法不但可以简化生产工艺,而且涂膜性能优良。     

Water-borne polyurethane dispersions and their use in functional coatings

Conclusions  There were high hopes and many predictions in the 1970s that the coatings industry would rapidly move to water-borne coatings. This did not occur in this very traditional and conservative industry. However, environmental legislation is now ensuring that more and more coatings systems are moving towards water-borne or high solids. This should not be viewed as a threat by the resin suppliers, but as a great opportunity. Small to medium size resin suppliers who are willing to tailor water-borne resin systems such as PUDs and hybrids to individual customer demands, will have an assured future. There is a very big market for functional coatings and for the resin systems designed for them.     

木器涂料用苯丙微乳液的合成

以苯乙烯、甲基丙烯酸甲酯和丙烯酸丁酯为主要单体,过硫酸盐为引发剂,通过种子乳液聚合法合成了新型木器涂料用苯丙微乳液,研究了乳化剂的用量、阴离子非离子乳化剂配比、聚合工艺、功能性单体的种类和用量、软／硬单体组成对乳液和涂膜性能的影响。     

Defect free coatings from two-pack isocyanate curable acrylic dispersions

The combination of isocyanate crosslinking groups and water as continuous phase in coatings provides a real challenge to the coatings industry. Especially the ability of the crosslinker to react with water and liberate carbon dioxide is a problem. CO₂ will be entrapped in the film, resulting in poor aesthetic properties and porous films with reduced resistance properties. In this paper it will be shown that the choice of acid monomer and the acid value have a significant effect on the physical drying rate of the films’ on the level of water remaining in the film after cure, and on the rate of decrease of the NCO concentration and CO₂ blister formation. Increasing the acid value will result in faster NCO loss and more CO₂. The same effects are reached when acrylic acid is chosen over methacrylic acid, which in turn yields a faster NCO concentration decrease and more CO₂ blisters than βCEA. A faster decrease of the NCO group concentration does not necessarily lead to a faster tack free time. By careful selection of the type of acid defect free films without CO₂ blisters can be formed with a thickness of at least 300 μm (dry). CO₂ blister formation is caused by the presence of water soluble poly-acid which remains in the film enabling the reaction of the isocyanate group with water.     

新一代水性木器涂料用丙烯酸乳液的研究

介绍了开发的新一代应用于水性木器涂料的丙烯酸聚合物,探讨了聚合物乳液的粒径、形貌结构设计和单体组成等对清漆涂膜外观和透明度等的影响。讨论了水性家具涂料原材料的选择,并进行了抗粘连性能、表观性能、耐化学品性、耐热性及硬度建立等应用性能测试。结果表明,以上各项性能优异。     

单组分室温交联丙烯酸酯微乳液木器涂料配方研究

采用自制的丙烯酸酯微乳液配制了单组分室温交联木器涂料,对成膜助溶剂、润湿流平剂、消泡剂、增稠剂等助剂进行了筛选,并通过正交试验对各助剂的最佳用量进行了确定。结果表明,由丙二醇单丁醚和二丙二醇单丁醚构成的混合成膜助溶剂,其添加量在4%较为适宜;润湿流平剂BYK346的适宜添加量为0.4%;消泡剂FoamStar-A34添加量为0.4%较为适宜;缔合型增稠剂Rheolat 212适宜用量为0.7%。     

水性木器涂料配方体系设计原则

阐述了水性木器涂料配方体系中水性树脂及各种助剂的选择原则,以配制出性价比合适的水性木器涂料。     

我国工业水性木器涂料的现状和发展方向

介绍了国内外水性木器涂料在工业中的用途和发展现状,并着重对水性木器涂料在工业中的应用做了展望。     

水性工业木器涂料存在问题及解决方案

介绍了国内水性工业木器涂料的现状和发展方向,重点阐述了水性工业木器涂料存在的问题及相应的解决办法。     

Rheology of acrylic dispersions for pressure sensitive adhesives

Pressure sensitive adhesives (PSA) can be defined as adhesive materials which, when dry, possess a lasting and aggressive tack which enables them to adhere to a wide variety of substrates, upon contact. The interest in aqueous acrylic dispersions PSA grew with the need to solve solvent emission problems. The theological characteristics of these PSA dispersions are important for the coating machinability whilst the rheological characteristics of the dried PSA dispersions are important for the performance of the adhesive systems. The rheology of these dispersions, which are generally applied at a concentration in the range of 50% dry material, is influenced by parameters such as particle size, the nature of the acidic monomers, the method of introduction of the acidic monomers, the addition of thickeners and many others which are not covered in this paper. The flow characteristics (shear stress versus shear rate) of these dispersions can be described by means of mathematical models and therefore characterized by a limited number of parameters. The adhesive test methods commonly used today are largely the result of empirical attempts to characterize adhesive performance under actual conditions. The more-common tests are used in order to quantify tack, adhesion and cohesion. We have defined some testing methods in order to characterize the viscoelasticity of the PSA (dynamic measurements at different temperatures and frequencies and creep measurements at different temperatures). We have correlated these rheological parameters to the adhesive performances and the molecular characteristics of the acrylic copolymer used.     

Spray drying of low-Tg acrylic dispersions

Conclusions  The application of the sequential polymerization technique for the synthesis of structured acrylic latices offers a very interesting way for the spray drying of low Tg polymers. Polymer particles having a soft nucleus and a hard shell can be dried without difficulty and give rise to non-tacky powders. Polymers with the same chemical composition, but with a homogeneous structure are not easily converted into powders. The laboratory spray drying apparatus with a static nozzle produces very fine monodisperse powders, having moderate flowability. Small additions to the crude powders of fluidizing agents, such as micronized silica, significantly improve their flowability. Work carried out at LARAC SpA — ?MW Gruppe, Corso Sempione 13, 21053 Castellanza (VA), Italy     

硝基木器漆

介绍硝基木器漆的基本特性、新型硝基木器漆与传统硝基漆的比较。新型硝基木器漆的组成体系、漆膜病态及改善办法。     

水性木器漆

讨论目前国内水性木器漆的种类、性能和应用 ,比较了几种代表性的水性木器漆和乳液的性质 ,以及水性木器漆与溶剂型漆的优劣。从环保的角度出发 ,水性漆拥有良好的前景