氨基树脂及其涂料

低温烘烤三聚氰胺固化涂料组合物，醚化三聚氰胺树脂的制备及其在涂料中的应用[编者按]     

试论水性环氧树脂与甲丁醚化三聚氰胺树脂的合成与应用

水性环氧树脂是一种具有超强稳定性的新型水性涂料,由于本身体系中含有大量可以在碱性环境中稳定存在的醚键,所以还具有良好的耐碱稳定性。本文分别从水性环氧树脂的合成方法与甲丁醚化三聚氰胺树脂的合成方式入手,对水性环氧树脂和甲丁醚化三聚氰胺树脂性能进行分析,并对两者通过复配成膜的过程及实际的应用展开细致探讨。     

改性水溶性三聚氰胺树脂DMF_3的合成及应用

对三聚氰胺醚化树脂的合成工艺进行了研究,并着重对影响醚化反应的因素进行了探讨。加入改性剂改善了产品的稳定性。将产品用于涂料印花,对印花的摩擦牢度和洗刷牢度有所提高。     

中醚化三聚氰胺树脂的合成及其在丙烯酸环氧树脂中的应用

采用两步法合成了用于涂料交联剂的甲醚化三聚氰胺树脂，考察了温度、时间、催化剂等因素对交联剂中不同组分含量的影响，确定了最佳的合成条件。用红外光谱分析了产品的主要基团，验证了两步的反应机理，并将合成的中醚化三聚氰胺树脂与实验室自制的丙烯酸改性环氧树脂复配，考察了涂膜固化条件。结果表明，合成的交联剂贮存性能良好，醚化三聚氰胺树脂作为交联剂加入到丙烯酸环氧树脂中，可以明显降低固化温度且改善原有涂膜的脆性，成膜性能好，尤其是具有优良的附着力、柔韧性和耐化学品性。     

国内外三聚胺市场现状与发展前景

三聚氰胺是一种用途十分广泛的精细化学品。三聚氰胺与甲醛缩合并在丁醇介质中醚化,可制得数十种具有不同性质的热固型树脂,通称为丁醇改性三聚氰胺.甲醛树脂,简称三聚氰胺树脂(密胺树脂)。密胺树脂具有优良的机械性能、化学性质、热性能及电性能等,主要用于高档涂料、层压板、装饰板、木材粘合剂和皮革鞣剂,此外还可制成各种电器开关、收音机底座、其它电器绝缘材料以及日常生活用品等。     

苯代三聚氰胺(561)树脂的合成

一、引言在工业涂料领域中,氨基树脂中的苯代三聚氰胺树脂为近年来发展比较突出的一种,其性能优异,胜于尿醛与三聚氰胺树脂,作为树脂原料的单体,苯代三聚氰胺的结构与三聚氰胺类似,有一个活性氨基被苯基所取代,其活性氨基和甲醛反应的羟甲基化物用作装饰板,成型材料,以醇类改性的醚化产物用于涂料,由此而制成的树脂由于苯基的导入而具有种种不同的特性。不论在耐热性、亲油性与醇酸树脂或其它树脂(丙烯酸树脂、环氧树脂、硅树脂、缩丁醛树脂等)的混溶性     

甲醚化氨基树脂的性能及应用概况

1 前言 氨基树脂用于涂料工业已有50多年历史,近年来氨基树脂的科研和生产发展速度是很快的。最初用于涂料上的丁醚化氨基树脂是低固体分,以正丁醇和异丁醇作醚化剂的聚合型树脂。由于丁醇醚化氨基树脂有其不足地方,如它与丙烯酸等某些树脂拼温性不好,做成油漆VOC高。为了减少涂料施工中有机溶剂的挥发对环境的污染,而发展了甲醚化三聚氰胺树脂,这是一种低分子量、低粘度、高固体、可水溶性的单体型树脂。在做成油漆时能够减少溶剂使用     

甲丁醚化三聚氰胺缩甲醛树脂的合成与分析

采用2步法合成了涂料交联剂甲丁醚化三聚氰胺树脂,考查了温度、时间、酸碱度等因素对交联剂性能的影响,确定了最佳的合成工艺。结果表明,在羟甲基化反应阶段,温度为70℃、反应时间20 min、pH值为8.5时,体系羟甲基含量较高且游离甲醛含量较低;在醚化反应阶段,温度50℃、反应时间60 min、pH值为4.5时,树脂的贮存性能良好。     

HMMM树脂合成的探索[摘]

本文是以三聚氰胺,甲醛为主要原料,在碱性条件下首先发生羟甲基化反应,生成六羟甲基三聚氰胺中间体,再在酸性条件下以过量甲醇进行醚化,合成得六甲氧甲基三聚氰胺树脂。用该树脂与醇酸树脂配合,制成烘漆,其性能优于丁醇醚化三聚氰胺树脂。 (化工青年论文)     

浅色氨基大漆的制备和性能

本文介绍浅色氨基大漆的制备和性能,由精制大漆、醚化三聚氰胺—甲醛树脂和催化剂配制,根据红外光谱图表明,在催化剂存在下,少量漆酚与醚化三聚氰胺—甲醛树脂在漆膜中进行反应。     

Plasma deposition of adhesion-promoting polymer layers onto polypropylene for subsequent covering with thick fire retardant coatings

Melamine resins were used as 50-μm-thick fire retardant coatings for polypropylene (PP). Preceding deposition, low-pressure plasma polymer films of allyl alcohol were coated onto PP to improve the adhesion between PP and melamine resin coatings. The efficiency of such fire retardant coatings was confirmed by flame tests. The plasma-deposited polymer and the dip-coated melamine resin films were characterized by Fourier transform infrared-attenuated total reflectance spectroscopy and X-ray photoelectron spectroscopy (XPS). The adhesion of coatings was measured using a 90° peel test with a doubled-faced adhesive tape. To detect the locus of failure, the peeled layer surfaces were inspected using optical microscopy and XPS. Thermal properties of PP thick melamine resin-coated films were analyzed by thermogravimetric analysis.     

制罐用白可丁的研制

使用聚酯树脂和甲醚化氨基树脂配合制备制罐用白可丁，讨论了不同聚酯树脂、氨基树脂及催化剂的选择，及其对漆膜性能的影响。     

Studies on Performance of Cured Water-Borne Melamine–Acrylic Emulsion Coatings

In this study, water-borne coating formulations which could be cured quickly were prepared using acrylic emulsion as the major coating constituent and highly reactive melamine resin as curing agent, and further incorporating a variety of additives. Melamine and acrylic types, melamine/acrylic mass ratio in coating formulation, and curing temperature were found to influence the performance of cured coatings. When melamine resin etherified slightly with methanol was used as curing agent, melamine/acrylic mass ratio was 0.45 and the coating formulation was baked at 170°C for 30 s, it was observed that performance of cured coating was the best. FTIR was used to study molecular structural changes of coatings after curing, and to analyze the cure mechanism of the coating. DSC was used to study the range of temperature in which curing occurred. The water-borne coating prepared in this study could be cured quickly when it was applied on decorative paper surface and baked at high temperature. Performance properties of cured coatings were tested according to standard methods, it was observed that dry heat resistance, wet heat resistance, adhesion, pencil hardness, and stain resistance all met standard requirements.     

超薄膨胀型钢结构防火涂料的研制

以磷酸二氢铵、季戊四醇、三聚氰胺及丙烯酸树脂为原料研制了一种超薄膨胀型丙烯酸树脂钢结构防火涂料。并依据国家标准测定了不同配方防火涂料的理化性能和防火性能,分析了防火涂料的作用过程,并提供了相应的检测标准和测试结果,给出了性能优异的配方。阻燃体系(磷酸二氢铵、季戊四醇、三聚氰胺)的分解温度对防火涂料的性能有明显的影响;该配方使用原料简单、来源丰富、成本低、防火性能好。     

氨基涂料系列产品开发与配方设计

试验选用异丁醇醚化的三聚氰胺甲醛树脂分别与醇酸树脂、环氧树脂和丙烯酸树脂进行复配制漆,对这3类氨基涂料综合性能进行了考察。试验表明,当与醇酸树脂复配时树脂配比为1∶3、溶剂用量在6%～10%时涂膜性能较好;与环氧树脂复配时树脂配比为3∶1时涂膜性能最佳,添加萘酸钙催干效果较好;与含羟基丙烯酸树脂复配时树脂配比为1∶3时涂膜性能最佳。     

一种超薄膨胀型钢结构防火涂料的研制

以磷酸二氢铵、季戊四醇、三聚氰胺及丙烯酸树脂为原料研制了一种超薄膨胀型丙烯酸树脂钢结构防火涂料。并依据国家标准测定了不同配方防火涂料的理化性能和防火性能,分析了防火涂料的作用过程,给出了性能优异的配方设计。     

Investigation of the curing kinetics of alkyd–melamine–epoxy resin system

Properties of coatings based on alkyd resin can be improved via blending with other suitable resins. Recent studies assessed that many properties could be improved by blending with epoxy resins as well as with melamine resins. The aim of this work was to investigate the effect of epoxy resin content on the curing process in alkyd–melamine–epoxy three component blends. The coatings with two mixing ratios of alkyd/melamine (70:30 and 80:20) were formulated. They were made into baking enamels by blending with 3 and 5 wt% of epoxy resin on total resin solid. Curring kinetics was investigated by differential scanning calorimetry (DSC) and application of Ozawa isoconversional method. Fourier transform infrared spectroscopy (FTIR) was used to follow major curing reactions. The absorbance of –OH and –N–CH₂R, showed significant reduction and confirmed that the epoxy resin reacts and inserts in enamel structure. It was found that resin system with alkyd/melamine ratio of 70:30 and 3 wt% of epoxy resin has the lowest apparent activation energy of 141.5 kJ mol⁻¹ and needs the shortest time of 34.2 min to reach final apparent degree of cure. Isothermal DSC experiments have confirmed these findings. The samples with 30 wt% of melamine resin had higher hardness of baked enamels then samples with 20 wt%. They also showed an increase of hardness with the increase of epoxy resin content.     

高固体分低温超快干氨基烘干磁漆的制备

介绍了采用苯甲酸改性的短油度豆油快干醇酸树脂和甲醇与丁醇混合醚化的三聚氰胺甲醛树脂为基料制成高固低温快干型的低成本烘干涂料。简述了该涂料与所用快干醇酸树脂的原料选择、配方设计、生产工艺和产品性能指标等。     

Semiconductive polyaniline melamine–formaldehyde blend electronic barrier to corrosion

Abstract

Polyaniline (PANI) is one of the intrinsic semiconductive polymers and shows some useful properties: high conductivity, transparency for the red and violet domain of spectrum, good elasticity and processability, superficial tension and chemical, photochemical and electrochemical behaviour. A PANI primer coat has been developed to act as an active electronic barrier to corrosion. When overlaid with a conventional durable topcoat, the coating has been shown to protect steel against salt, pollutants and other harsh environments.

Dry blends were prepared by blending the powders of doped PANI and the host polymer, a commercial melamine–formaldehyde resin AZAMIN M514 in a mixer. The hardness, elasticity, resistance and protective behaviour of melamine–formaldehyde resin films were determined. The protective behaviour of obtained melamine–formaldehyde resin blend was evaluated from quantity of Fe (II) released by the coated carbon steel samples (exposed area 1·0 cm^–2) immersed for 1 month in 50 mL 3·5%NaCl solutions. The prepared coatings protect substrate from corrosion by stabilising the oxide layer formed on the metal surface and thus prevent the metal dissolution process. An optimum formulation of melamine–formaldehyde resin coatings with 5 wt-% doped PANI exhibits good protective behaviour.     

The effect of TiO2, pigmentation on the hydrolysis of amino resin crosslinked epoxy can coatings

Pigmented (TiO₂), amino resin crosslinked coatings, designed for applications in can coatings’ internal lacquers, were formulated, characterized, applied, and cured. Three grades of a pigmentary form of TiO₂ were characterized in terms of their particle size, their particle morphology, their zeta potential, and their moisture retention behavior. Epoxy coatings that were crosslinked using one of several, different amino crosslinkers were prepared. The effect of the presence of the TiO₂ pigments on the hydrolysis of the cured coatings was monitored via the controlled retorting of the coatings. The different grades of TiO₂ pigment were selected, to establish whether or not they could be used interchangeably with respect to hydrolysis and to melamine release. Also, the effects of the aging of the fluid coatings on the amount of melamine released from the coatings (after curing and retorting) were monitored. Storage under laboratory conditions for 2, 20, and 40 weeks was used for this purpose. The TiO₂ pigment contributed significantly to the hydrolysis behavior of the epoxy coatings in that their presence substantially reduced the amount of melamine released and the extent of crosslinker hydrolysis. Typical results show that excluding the TiO₂ pigment particles from the formulation results in there being 50% more hydrolysis of the crosslinker to melamine. With respect to the melamine release and crosslinker hydrolysis, the different grades of the pigment gave similar results.