乳胶漆中游离甲醛的萃取及分光光度法测定

介绍了乳胶漆的实验原理 ,探讨了影响甲醛萃取率的主要因素 ,得出适用于乳胶漆中游离甲醛的测定方法     

水性乙丙乳胶漆

研制的乙丙乳胶漆以醋酸乙烯为主体与少量丙烯酸酯共聚物乳液（乙丙乳液）为基料，拼入颜、填料和各种助剂配制而成，具有性能好、无污染、价格低等特点。介绍了乙丙乳液及其乳胶漆的配方和生产工艺。讨论了影响该乳胶漆耐水性和稳定性的诸种因素。     

复合型聚醋聚乙烯酯乳胶漆的制备

研究了在聚乙烯醇缩甲醛溶液中制备聚醋酸乙烯酯乳胶漆的方法。所制得的复合型聚醋酸乙烯酯乳胶漆具备醋酸乙烯酯均聚物乳胶漆的优异性能,且降低了成本。     

内墙涂料中甲醛含量的检测

提出了一种使用乙酰丙酮作显色剂、结合分光光度法检测内墙涂料中甲醛含量的方法。通过绘制甲醛标准工作曲线,得出了样品测定的计算因子,进而给出了甲醛含量计算公式。对2种内墙涂料样品进行测定的结果表明,该方法操作简单,准确可靠,回收率达到99％以上,相对平均偏差分别为1．3％和0．33％,适用于游离甲醛含量为0．005～0．5g/kg的各种内墙涂料。     

乳胶漆的耐候性

乳胶漆由于其性能优异、施工方便、对环境无污染、价格适当,是当前我国建筑涂料中发展最快的品种之一,目前大量的建筑都使用这类涂料。从大量的涂装工程来看,涂装建筑物在5年或更长的时间内都能保持满意的装饰效果,有的工程甚至可达10年之久,但是有些工程涂装仅仅几个月就出现了颜色退光的现象,为了解决在施工中出现退色问题,并适应当前建筑业外墙向绚丽多彩发展的需要,本文主要探讨各种类型和各种颜色乳胶漆的耐候性,进行了实验室的加速曝晒试验,也进行了户外的天然曝晒。     

乳胶漆废水治理

乳胶漆废水的化学组成包括苯乙烯、醋酸乙烯、丙烯酸及其酯类、颜填料和乳化剂等，其化学需氧量（ＣＯＤ）７０００～１５０００ｍｇ／Ｌ，ｐＨ６～７，色度５１２～２０４８，δ＿ｓ８００～１２００ｍｇ／Ｌ。采用絮凝－加压气浮－煤渣黄砂吸附过滤方法处理乳液、乳胶漆废水。筛选了十余种絮凝剂，选用硫酸铝和聚丙烯酰胺。控制处理过程的ｐＨ８～９，絮凝剂用量为１０％硫酸铝１０～２０ｍｌ，０．２％聚丙烯酰胺６０～８０ｍｌ／１０００ｍｌ废水。处理后废水ＣＯＤ降至１００ｍｇ／Ｌ以下，符合排放标准。     

乳胶漆粘结剂

乳胶漆粘结剂朱传 （北京东方化工厂）Ｔｈｅｂｉｎｄｅｒｓｆｏｒｌａｔｅｘｐａｉｎｔｓ￥ＺｈｕＣｈｕａｎｑｉＡｂｓｔｒａｃｔ：Ｔｈｅｓｅｃｏｎｄｉｓｓｕｅｏｆａｓｅｒｉｅｓｃｏｕｒｓｅｓｏｎｌａｔｅｘｐａｉｎｔ．１．粘结剂的定义任何涂料品种，可以不含任?..     

白乳胶中甲醛含量测定方法研究

采用化学滴定法(碘量法)和乙酰丙酮分光光度法对五种市售白乳胶中甲醛含量进行测定与比较,并设计出一种可以快速简便测定甲醛含量的定性方法——希夫试剂比色法。结果表明:采用碘量法和分光光度法测定白乳胶中游离甲醛含量,两者测试结果相近,偏差在2.6%～7.0%之间;希夫试剂比色法操作简单、快速,但误差较大,可以用作快速定性判定样品中是否含有游离甲醛;在其它条件保持不变的前提下,测试温度越高,白乳胶中游离甲醛含量的测试结果越大。     

分散剂结构和用量对调色乳胶漆性能的影响

设计了乳胶漆基础配方,研究了分散剂结构和用量对调色乳胶漆性能的影响。实验结果表明,乳胶漆的稳定性、耐水性、展色性、遮盖力等性能与分散剂结构与用量密切相关。当分散剂选用S110时,且用量为乳胶漆的5‰~7‰时,制备得到的乳胶漆在稳定性、耐水性、展色性较其它分散剂有明显优势。     

IPN聚氨酯乳胶漆

本文就利用互穿聚合物网络ＩＰＮ工艺，生产水溶性聚氨酯乳胶漆的品种与分类，制造方法、产品性能等问题予以探讨。     

乳胶漆的PVC

详细阐述了乳胶漆的颜料体积、百分浓度及其作用，并举例说明之。     

乳胶漆概论

乳胶漆概论朱传（北京东方化工厂）Ｔｈｅｏｕｔｌｉｎｅｏｆｌａｔｅｘｐａｉｎｔ￥ＺｈｕＣｈｕａｎ－ｑｉ（４１）油漆是一类古老的产品，已有以千年计的历史。现代油漆（涂料）工业的出现也已是三百年以前的事。相对而言，乳胶漆则是崭新的产品，其问世刚刚半个世纪。...     

乳胶漆助剂(续五)

A serial article.     

缩甲醛类胶粘剂中游离甲醛含量的测定

现行GB18583-2001标准中是采用乙酰丙酮分光光度法来检测胶粘剂中的游离甲醛含量,但是,在高温及强酸性环境中,缩甲醛类胶粘剂会与去甲醛剂发生水解反应,分解出10倍于原产品的游离甲醛。因此,采用GB18583-2001标准已经不能准确测定出缩甲醛类胶粘剂中游离甲醛的真实含量。通过对原有标准进行适当改进,提出了适用于缩甲醛类胶粘剂中游离甲醛含量的检测方法,经实验验证后得知,采用改进的检测方法,所得测试结果比较准确。     

Flooding and floating in latex paint

Flooding and floating are problems in many paint applications. If pigment concentration is uniform on the surface but not through the thickness of the film, one refers to ‘flooding’ (horizontal separation). If, however, concentration differences are visible across the surface of the paint film, one refers to ‘floating’ (vertical separation). In this article, the influence of pigment, filler, additives, and processing conditions on the flooding and floating of colored latex paint were investigated. It was discovered that too broad a distribution of pigment and filler particle size can lead to flooding and floating. Different levels of pigment (TiO₂) or filler (kaolin) loading cause diverse degrees of flooding and floating. Waterborne coatings that do not exhibit flooding or floating may show these conditions when diluted. Using dispersants or thickeners with hydrophobic constituents, increasing viscosity, reducing surface tension, etc., all help to prevent or reduce flooding and floating. Comparison tests revealed little influence of processing conditions on flooding or floating.     

Recycling waste latex paint in concrete

Currently, in Ontario, Canada, around 21.7% of the total hazardous waste (HZW) collected by municipalities is waste paint. Waste latex paint (WLP) alone constitutes 12% of the total HZW. It is estimated that only 10-30% of this waste is presently being collected but this proportion is growing with public education efforts. In addition, due to increasingly more stringent environmental regulations on volatile organic compounds (VOCs), more latex-based paints will be produced compared to solvent- and oil-based alkyds. This will result in more WLP being generated annually in Ontario and across North America. The disposal cost of such waste currently varies between Can$0.90 and Can$1.40 per litre. This study was conducted in collaboration with the City of London, Ontario and the Ontario Paints and Coatings Association and aims at investigating the benefits of recycling WLP in concrete with a special focus on concrete sidewalks. WLP was used in concrete mixtures both as a partial replacement for virgin latex and for mixing water. This paper demonstrates that concrete mixtures incorporating WLP can have improved workability, higher flexural strength, lower chloride ion penetrability, better resistance to deicing salt surface scaling and can be more economic because they require less water-reducing and air-entraining admixtures. The results also indicate that the annual urban concrete sidewalk construction could use the yearly production of WLP while producing sidewalks with enhanced properties and durability.