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聚乙烯醇的用途及使用方法

聚乙烯醇(简称PVA)外观为白色粉末,是一种用途相当广泛的水溶性高分子聚合物,性能介于塑料和橡胶之间,可分为纤维和非纤维两大用途。由于PVA具有独特的强力粘接性、皮膜柔韧性、平滑性、耐油性、耐溶剂性、保护胶体性、气体阻绝性、耐磨性以及经特殊处理具有的耐水性,因此除了作纤维原料外,还被大量用于生产涂料、粘合剂、纸品加工剂、乳化剂、分散剂....

建筑使用外墙保温材料的优势

保温材料在建筑外墙的使用已经越来越普遍,在我国特别是北方的寒冷城市,保温材料的使用都比较早。那对于使用了保温材料的建筑有哪些优势呢?下面上海荣欧化工科技有限公司为大家介绍一下使用保温材料系统的优势。 一、对于大家熟知的也是最有价值的优势就是能够对建筑起到保温导热的功能,使得建筑达到冬暖夏凉的效果。由于保温材料的物理性质,冬天能够....

2017-07-06保温材料
干混砂浆外加剂的种类及其作用

与现场拌制砂浆的外加剂相比,干混砂浆外加剂具有以下特点:①不含水,一般为固体;②与水泥、砂及其它外加剂混合时,干态不发生反应,而加水后能充分分散并高效发挥其作用。干混砂浆外加剂主要有可再分散性胶粉、保水增稠剂、减水剂、调凝剂、防水剂、纤维、消泡剂等。其中纤维素醚和可再分散性胶粉是近年来才开发的干混砂浆中最常用而且效果非常显著的两....

淀粉醚的应用

淀粉醚主要应用于建筑砂浆中,能影响以石膏、水泥和石灰为基料的砂浆的稠度,改变砂浆的施工性和抗流挂性。淀粉醚通常与非改性及改性的纤维素醚配合使用。它对中性和碱性体系都适合,能与石膏和水泥制品中的大多数添加剂相容(如表面活性剂、MC、淀粉及聚醋酸乙烯等水溶性聚合物)。 主要特性: (1)淀粉醚通常和甲基纤维素醚配合使用,显示了两者较好的协同....

憎水剂的应用领域及特点

憎水剂是外墙防水专用防水剂,它主要用于瓷砖外墙防水(喷涂)、卫生间、厨房、阳台等瓷砖缝防水,混凝土墙面、瓷砖、石材、木材、水泥面和路面防水,尤其是古建筑修缮(寺庙、教堂、国家保护的古文化遗址)的应用具有抗酸碱、耐老化、防碳化、泛碱、防潮、防霉等。憎水剂可按1:5或1:10兑水的比例不等,用喷雾器喷在建筑物表面,可迅速渗入建筑物,形成肉眼看不....

木质纤维素简介及应用领域

木质纤维素的简介:木质素纤维是天然木材经过化学处理得到的有机纤维,外观为棉絮状,呈白色或灰白色。通过筛选、分裂、高温处理、漂白、化学处理、中和、筛分成不同长度和粗细度的纤维以适应不同应用材料的需要.由于处理温度高达250℃以上,在通常条件下是化学上非常稳定的物质,不为一般的溶剂、酸、碱腐蚀,具有无毒、无味、无污染、无放射性的优良品质,不....

高效减水剂的作用及用途

关于高效减水剂的作用及用途,上海荣欧化工科技有限公司为大家作以下介绍: 一、高效减水剂的作用 高效减水剂是指在混凝土和易性及水泥用量不变条件下,能减少拌合用水量、提高混凝土强度;或在和易性及强度不变条件下,节约水泥用量的外加剂。与普通减水剂相比,减水及增强作用都较强。( 1 )静电斥力理论 水泥水化后,由于离子间的范德华力作用以及水泥....

可再分散性乳胶粉的性能及应用领域

可再分散乳胶粉的产品性能: 可再分散乳胶粉是由聚合物乳液经喷雾干燥制成,与砂浆中的水混合后,遇水乳化分散,重新形成稳定的聚合乳液,可再分散乳胶粉在水中乳化分散后,水分蒸发,在砂浆内形成聚合物膜,改善砂浆各项性能,不同的可再分散乳胶粉对干粉砂浆有些不同的作用。──提高砂浆的抗冲击性,耐久性,耐磨性 胶粉颗粒填充了砂浆的孔腔,砂浆的密实度增加,提....

什么是可再分散性乳胶粉

可再分散乳胶粉简介可再分散乳胶粉是由一种醋酸乙烯酯与叔碳酸乙烯酯-VeoVa或乙烯或丙烯酸酯等二元或三元的共聚物,经过喷雾干燥得到的改性乳液粉末,它具有良好的可再分散性,与水接触时重新分散成乳液,并且其化学性能与初始乳液完全相同。 可再分散乳胶粉的发展历史 可再分散乳胶粉的研究始于1934年德国的I.G.Farbenindus AC 公司的聚醋酸乙烯类....

纤维素醚的概述

纤维素是一种既不溶解也不熔融的多羟基高分子化合物。纤维素经醚化后则能溶于水、稀碱溶液和有机溶剂,并具有热塑性。 经醚化后的纤维素溶解性能发生显著变化,可溶解于水、稀酸、稀碱或有机溶剂,溶解度主要取决于三个因素:(1)醚化过程中所引入基团的特性,引入的基团越大则溶解度越低,引入的基团极性越强,纤维素醚越易溶于水;(2)取代度与醚化基团在....

The action of hydroxypropyl methyl cellulose in dry powder mortar

Cellulose ether is a kind of synthetic macromolecule polymer made from natural cellulose as raw material and chemically modified. Cellulose ether A derivative of natural cellulose. Cellulose ethers are produced differently from synthetic polymers. The most basic material is cellulose, a natural polymer compound. Because of the special structure of natural cellulose, cellulose itself has no ability to react with etherification agent. But after the treatment of swelling agent, strong in the molecular chain and the intra chain hydrogen bond was destroyed, the activity of hydroxyl release into a reaction capability of alkali cellulose, after etherification agent OH reaction medium into OR medium to obtain cellulose ether.....

The important role of cellulose ether in ready mixed mortar

The addition of cellulose ether in premixed mortar is very low, but it can significantly improve the performance of wet mortar. It is a major additive which influences the workability of mortar. Reasonable choice of different varieties, different viscosity, different particle size, different degree of viscosity and amount of cellulose ether, the performance of dry mortar improved and produced a positive impact. At present, many masonry and plastering mortar water retention performance is not good, a little rest for a few minutes there will be water separation.....

Application progress of cellulose ethers in dry mixed mortar

Traditional mortar easy cracking and bleeding, the performance is not up to the requirements, environmental pollution and other issues, will be gradually replaced by dry mixed mortar. Dry mixed mortar, also known as pre temperature (dry), dry powder mortar, dry mixing, dry mortar, dry mortar, semi-finished products, does not contain cellulose ether mixed mortar mixing water with excellent thickening, emulsifying, suspension, performance film, protective colloid, keep moisture, adhesive, is dry mixed mortar admixture in the important.....

Hydroxypropyl methylcellulose

1, product overview Cellulose ether is a kind of important water-soluble polymer, is a general term for a series of products with natural cellulose after alkalization and etherification of cellulose ether into ionic and nonionic two types of products, products are mainly ionic carboxymethyl cellulose (CMC), non-ionic products including the methyl cellulose (MC), hydroxypropyl methyl cellulose (HPMC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC) etc......


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