无机硅酸锌预涂底漆的研制

介绍了无机硅酸锌预涂底漆成膜机理、硅酸乙酯水解、改性及主剂的制备。通过对硅酸乙酯改性,增加了无机硅酸锌预涂底漆漆膜的柔韧性;采用耐盐雾实验选择了防锈颜料磷酸锌、B-004磷铁粉及5%的锌粉添加量;通过对比无机硅酸预涂底漆的施工性、耐盐雾性及储存稳定性,确定了聚乙烯缩丁醛树脂液的加量,选用了HX-8800和BYK-420作为产品防沉剂,调整溶剂体系添加1%CB溶剂控制漆膜干燥速度,并最终确定了产品配方。此产品满足流水线自动喷涂工艺,干燥时间短、防锈性能好、可与多种面漆配套使用,并且不影响焊接和切割。     

水性无机富锌涂料

概述了由高摩尔比的硅酸钾和锌粉制成的水性无机富锌涂料的组成,性能,防腐机理的应用。测试结果表明,该涂料综合性能优良,是一种发展前景十分广阔的重防腐涂料。     

醇溶性无机富锌涂料的研制

醇溶性无机富锌涂料是以硅酸乙酯水解液为A组分,聚乙烯醇缩丁醛为B组分基料,配以锌粉以及其他填料、助刺、溶剂等制成。简要阐述了醇溶性富锌涂料成膜机理和对硅酸乙酯水解配方的研究,以及锌粉添加量对防腐性能的影响。     

无机硅酸锌车间底漆在冶金设备涂装中的应用

介绍了无机硅酸锌车间底漆在冶金设备涂装中的应用以及施工步骤,此漆具有突出的快干性,可焊性,漆膜薄,污染程度小,对工件在车间周转过程中起到临时防腐的作用,可带漆直接焊接,不会影响其焊接机械性能,焊缝中凹坑、气孔等较少,在热加工过程中,对漆膜损坏程度少,并且与面漆的配套性能极佳,无论是有机系或无机系树脂漆,均可配套使用。     

水性无机硅酸锌车间底漆的制备和施工

以硅酸钠和锌粉为主要原料,制备了水性无机硅酸锌车间底漆.讨论了该底漆的施工注意事项和基料、颜料、助剂等影响漆膜性能的主要因素.结果表明,当硅酸钠溶液与硅丙乳液质量比为24:4,锌粉与磷铁粉质量比为62:8时,采用500目高品质锌粉及恰当的助剂,可制得综合性能良好的涂料.     

Solventborne paint systems on carbon steel and hot-dip galvanized steel for a wide range of atmospheric exposures

The paper analyzes the performance of solventborne paint systems applied on carbon steel and hot-dip galvanized steel in a wide range of atmospheric exposures. The study has involved paint systems exposure for 3.5 years in eight natural atmospheres. The atmospheric conditions cover from temperate rural climates to tropical severe marine and Antarctic coastal regions. The paint systems included several alkyds formulated with a variety of pigments (anticorrosive and barrier), epoxies, chlorinated rubber, and zinc-rich (ethyl silicate and epoxy). It has been concluded that in rural and urban atmospheres alkyd systems afford equivalent anticorrosive protection of steel to the epoxy/polyurethane system. The toxic red lead pigment may be replaced in long linseed-oil alkyd primer paints by non-toxic pigments, such as a mixture of micaceous iron oxides (MIO) and black iron oxides or zinc phosphate, without affecting the anticorrosive properties of the paint system. In aggressive atmospheres (industrial, marine), paint systems including zinc-rich primers or applied on galvanized steel must be used, especially in surface regions with coating faults (scribes).     

可再分散聚合物改性无机硅酸锌涂层的耐化学性研究

以可再分散聚合物对无机硅酸锌涂料进行改性,通过浸泡试验及浸泡后柔韧性检测方法研究了改性无机硅酸锌涂层的耐酸、碱、盐等性能.结果表明,经可再分散聚合物改性的无机硅酸锌涂层其耐酸、碱、盐的能力都有不同程度的提高.涂层微观结构分析发现,可分散聚合物的连续成膜有效降低了无机硅酸锌涂层的孔隙率,从而增大了电解质溶液向涂层内部渗透的阻力以及成膜过程中对活性较高的锌粉的包覆作用.该改性涂层无毒、环保,添加方便,具有较好的应用前景.     

高性能醇溶性无机富锌涂料的研制

主要研究了无机硅酸锌底漆的制备工艺,并通过调整水解度,使用不同的树脂加以改性。使用各种试验测试手段对涂膜性能进行了分析检测,并讨论了不同制备工艺对涂膜性能的影响,最终得到涂膜的各项性能完全达到车间底漆和长效防腐底漆的要求。     

钠水玻璃富锌涂料固化机理的探讨

以硅酸钠溶液为成膜基料,锌粉为颜填料,去离子水为溶剂,加入增稠剂,固化剂等助剂,制备钠水玻璃富锌涂料;应用红外光谱分析、流变学测量和耐液性观察,研究钠水玻璃富锌涂料的固化机理。结果发现,其固化机理主要是硅酸之间的脱水反应和锌离子对硅酸的交联;流变学测试显示,粘度随温度的上升先减后增,随时间增加;用光学显微镜观测固化后的富锌涂膜分别在水、稀酸和碱溶液中浸泡后的状态变化,定性应证了这个机理。     

硅酸盐色谱分离中性氨基酸性能研究

将硅酸钠与硫酸铜或硫酸锌按等体积混合 ,制得新型无机离子交换剂硅酸铜、硅酸锌 ,分别用其作为色谱载体对中性氨基酸 (甘氨酸 ,丙氨酸 )进行分离 ,与强酸性阳离子交换树脂 0 0 1× 7的色谱行为作了比较。结果表明 ,合成的硅酸盐具有较好的分离性能。通过不同载体分离中性氨基酸 (甘氨酸 ,丙氨酸 )的流出体积的比较 ,硅酸铜的流出体积大于硅酸锌 ,硅酸锌的流出体积大于 0 0 1× 7。结果显示 ,硅酸铜比硅酸锌更适合于分离中性氨基酸 ,具有最好的分离特性     

A novel method for the hydrolysis of ethyl and isopropyl silicates

The hydrolysis of ethyl and isopropyl silicates without the use of an acid or base catalyst is described. The silicate and an alcohol which is a mutual solvent for water and the silicate are treated with water, preferably under reflux. For ethyl silicate the reaction temperature can be as low as 40°C. A liquid hydrolysate is obtained when the rate of water addition is carefully controlled. This hydrolysate will form a rigid coherent gel capable of binding refractory materials. Liquid hydrolysates prepared in this way have been used to make refractory shapes, also foundry moulds and cores for precision piece moulding work and an ethyl silicate hydrolysate can be used to prepare an anti-corrosion paint based on zinc. It would be expected that other lower alkyl silicates can be treated similarly to form hydrolysates which give a rigid coherent gel capable of binding refractory materials and which can also be used to prepare anti-corrosion paints based on zinc.     

Effects of particle sizes and shapes of zinc metal on the properties of anticorrosive coatings

The paper deals with a study of the zinc particle sizes and shape effects on the anticorrosive coating properties. As a binder the epoxyester resin is used. The zinc particle size and shape effects are discussed from the mechanical coating properties, film permeabilities to water vapor and above all the pigment anticorrosion protection efficiency points of view. The connection between the spherical particle sizes and the coating anticorrosive efficiency was found. The smaller particle sizes mean better anticorrosive coating properties. The lamellar zinc particles exhibit the highest anticorrosion efficiency at a concentration around 20 vol.%.     

The effect of amorphous chalcogenides on mechanical and anticorrosive properties of protective organic coatings containing high amounts of zinc metal particles

The objective of this paper concerns reduction of zinc metal content in organic coatings while preserving their high anticorrosive efficiency. The two goals can be achieved by using amorphous chalcogenides as components of the protective coating. Special attention was paid to materials containing Ge₂₀Se₈₀, Ge₃₀Se₇₀ and Ge₄₀Se₆₀, which were characterized by physico-chemical properties. An epoxy ester resin was used as binder for the investigated organic coatings. Organic coatings were prepared by combining zinc metal with amorphous chalcogenides. The resistance of the prepared films was evaluated using the results of mechanical tests. The anticorrosive efficiency of the prepared films was evaluated using the results of direct corrosion tests. Thus the following conclusion can be made from the results of anti-corrosive tests: the higher the pigment volume concentration of amorphous chalcogenides in the coatings, the higher the protective performance of the paint against corrosion.     

Study of epoxy and alkyd coatings modified with emeraldine base form of polyaniline

In this work we examine the ability of the emeraldine base form of polyaniline to impart protection against corrosion when it is used as additive of commercial paints. For this purpose, three paints, which are used as primers in marine environments, were checked: two epoxy coatings that differ in the presence or absence of inorganic anticorrosive pigment (zinc) and one alkyd coating. In a first stage, the rheological, structural, thermal and mechanical properties of the three coatings were characterized using viscosity measurements, infrared spectroscopy, thermogravimetric analyses and stress–strain assays, respectively. Furthermore, we observed that the resulting properties were not altered by the addition of a low concentration of polyaniline (0.3%, w/w). Accelerated corrosion tests were performed to compare the degree of protection of both the modified and unmodified paints. The polyaniline did not affect to the protective properties of the epoxy without inorganic anticorrosive pigment nor the alkyd formulations. In opposition, the polyaniline added to the epoxy paint with inorganic anticorrosive pigment induced the formation of a zinc oxide layer, which promoted the corrosion attack.     

新型硅丙乳液在水性无机富锌涂料中的应用

利用乙烯基三乙氧基硅烷对电气石粉表面进行包覆改性,再以原位聚合的方式将其引入至硅丙乳液的聚合过程中,合成了一种新型硅丙乳液,并以此作为有机成膜物质,添加至无机硅酸钾溶液中,制得富锌涂料.通过扫描电镜(SEM)和能谱(EDS)对包覆改性后的电气石粉及其涂膜进行表征;使用电化学阻抗谱(EIS)测试了富锌涂层的耐蚀性.结果表...     

Smart Paint for anodic protection of steel

In order to overcome the difficulties associated to the solubility and mechanical integrity of polyaniline (PAni) films, in this work we develop a binder by mixing PAni in the oxidized and undoped state (emeraldine base form) with 4-chloro-3-methylphenol, a plasticizer, and solvent. This binder has been used as a coating alone or combined with a conventional nitrocellulose paint to formulate the called Smart Paint. The characterization of binder films, which are cohesive and self-standing, shows the preservation of PAni properties, indicating that they satisfy the typical characteristics of anticorrosive coatings. Electrochemical assays have been carried out in H₂SO₄ solution using AISI 1006 steel plates coated with the binder and the Smart Paint. Results indicate that the binder and the Smart Paint promote the passivation of the metal substrate, reflecting their protecting abilities against corrosion.     

Enhancing fracture strength of ceramic core using sodium silicate as the binder

Ceramic cores used in the casting must exhibit high heat resistance because they come in direct contact with molten metals. Therefore, in this study, ceramic cores with high heat resistance and fracture strength were fabricated using sodium silicate as the binder instead of a commonly used organic binder. In addition, the prepared ceramic core was coated with Si and Si-Na precursors as the inorganic binder to improve the firing strength of the ceramic core. The thermal stability and firing strength of the sample were investigated. The results revealed that the firing strength of the ceramic core was significantly improved up to 15.2 MPa owing to the formation of a glass phase between the ceramic particles, which was formed by the reaction of sodium silicate and the inorganic binder precursor. In addition, the core was completely decomposed in an NaOH solution at a relatively low temperature of 60°C, indicating the excellent elution properties of the sample. These results indicate that the method proposed in this study is suitable for the preparation of ceramic cores with high fracture strength and excellent elution behavior.     

钢质油罐防腐蚀涂料

介绍了碳系导电填料和浅色导电填料的油罐内壁抗静电涂料以及无机富锌底漆、环氧富锌底漆、环氧云铁防锈漆、可复涂聚氨酯面漆、环氧沥青防锈漆、低温固化环氧沥青防锈漆等罐外壁重防腐蚀涂料,以及他们的性能、技术指标、施工工艺和应用范围。     

水性工业重防腐涂料

介绍了水性环氧涂料、水性丙烯酸涂料和水性无机硅酸锌涂料的分类及特点,并列举了水性工业重防腐涂料的应用。     

正硅酸乙酯水解-聚合的工艺参数研究及纳米SiO2的合成

以正硅酸乙酯为原料,分别以盐酸、硫酸、甲酸、天冬氨酸或其混合酸为水解催化剂制备硅溶胶.研究了不同催化剂、电解质以及醇对水解和胶凝过程的影响,结果发现,以盐酸或以盐酸和天冬氨酸的混合酸为催化剂可以得到较好的硅溶胶,而单独以有机酸和天冬氨酸为催化剂得不到理想的硅溶胶.同时还发现,醇的加入可以起到稳定硅溶胶的作用,而浓度较高的Na2SO4加剧了硅溶胶的聚结.另外,用X -射线衍射和紫外-可见光反射对纳米SiO2进行了分析.