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....

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....

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....

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....

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....

In order to speed up the development of bulk cement and application, saving resources and protecting and improving the environment, promote the city's bulk cement application process, according to the "Jiangsu province" and "Regulations on the promotion of bulk cement on the implementation of Jiangsu province to promote the work of bulk cement Administrative Punishment Ordinance notice" (by letter such Su 2011 No. 1171) spirit of the document, Huaian city Huaian District bulk do recently on the new City Plaza, sunny garden, garden city construction projects such as the use of ready mixed mortar checks.....

Recently, the national construction workers real name management platform formally launched. The platform can record real-time access to the site, migrant workers attendance, salary payment and other information, labour disputes, these information can be used as conclusive evidence; with the help of the real name system management platform, the establishment of salary accounts, the bank payroll system, to prevent the occurrence of arrears of wages; migrant workers can also display information such as the skill level, the equivalent of making electronic resume for them. Contribute to the frequent flow of migrant workers find the right job.....

About putty powder easy to powder of the problem, or the strength can not reach what. All know that the putty powder need to add cellulose ether, many users do not redispersible emulsion powder. Many people in order to save costs, without rubber powder, but this is why ordinary putty easy to powder, easy to appear product quality problems key! Ordinary putty (e.g. 821 putty) is mainly composed of chalk, add a little starch adhesive and CMC (carboxymethyl cellulose) made of methyl cellulose is also used with SF powder putty, such no adhesion, water resistance.....

Ⅰ,What are the two main classes of common cellulose ethers? 1) non-ionic, such as HPMC, cellulose, etc. 2) ionic type, such as CMC cellulose Ⅱ,The difference between two HPMC cellulose and CMC cellulose 1) The price of HPMC cellulose is higher, and the price of CMC cellulose is lower 2) HPMC without any material adverse reaction of cellulose CMC cellulose, because the production of residual acidic substances, used together with ash and cement were not calcium alkaline products lose viscosity, stability failure of.Cmc was affected by pH, can be used for gypsum based sand, can not be used for cement mortar. In high alkaline that will lose viscosity. 3) HPMC cellulose must use refined cotton production, CMC in addition to the use of refined cotton production, can also use the waste cloth, waste and other production, it is also one of the reasons why the market price difference. 4) CMC cellulose moisture absorption is larger, general conditions storage will contain larger moisture, HPMC cellulose water absorption is much smaller 5) CMC cellulose has a retarding effect on gypsum based mortar and reduces its strength ....

I. simple method for distinguishing the quality of hydroxypropyl methylcellulose HPMC: (1) first look at the whiteness of hydroxypropyl methyl cellulose, the appearance of color is white, uniform color, there is no more black spots under the microscope; poor color slants gray, black spots more. Look at the shape and liquidity of the particles, the cotton as the starting material for the use of long strip, poor mobility, the use of lignocellulose as the starting material of the particles near the cube, good liquidity. (2) followed by fineness and particle size distribution, the best size of hydroxypropyl methylcellulose is homogeneous, small particle size, granular and liquid; the opposite is not good. Hydroxypropyl methyl cellulose fineness generally has 80 eyes and 100 mesh, 120 less purpose, Hebei produces hydroxypropyl methyl cellulose mostly 80 mesh, the finer the fineness, in general, the better. (3) transmittance: the hydroxypropyl methyl cellulose HPMC into the water, forming transparent colloid, to see its transmittance, transmittance of the greater the better, indicating that less insoluble substances. The vertical reactor generally has good transmittance, but the horizontal reactor is a little worse, but it can not be explained that the quality of the kettle is better than that of the still kettle, and the quality of the product is determined by many factors. (4) proportion: the heavier the proportion, the heavier the better. Than in general, usually because of the high content of hydroxypropyl, hydroxypropyl content is high, then water conservation is better.....

保温砂浆中为什么需要添加一点量的羟丙基甲基纤维素，这是因为保温砂浆需要一定的保水作用. 羟丙基甲基纤维素的保水作用主要是为了保证砂浆中的水泥在硬化前,有充足的水分水化,不会因为失水过快,导致水泥没有得到足够的水分进行固化反应. 只有水泥水化反应完全,才能保证保温砂浆本身的强度和与基层材料的粘结强度.按照实验理论来看,水泥完全水....

This year plans to promote the Urumqi ready mixed mortar is one of the products of new energy-saving building materials, it not only plays in building energy-saving emission reduction, improve the efficiency and so on, in the home is also an ace. This is the 13 day, the reporter from the wall to do that news.象，特别是在经常要用水的卫生间或厨房里。这正是因为家装中使....

Starting in July 1st, the construction site of all new projects in Tai'an city and new and high-tech zones within the city limits the site of mixing mortar, all ready use of ready mixed mortar. 11, the reporter in the city building quality and safety work was held at the meeting was informed that the city will adopt various measures to comprehensively improve the quality and safety of ....

According to Pudong New Area news: let the city like a huge sponge, can absorb water, water storage, seepage, water purification, the construction of sponge city in the vicinity of the city, not only in the "face" on the good, but also "lining" project. The Lingang area, built by the sea, is turning into a huge sponge".....

News website of the Ministry of housing, housing issued by the Ministry of construction industry development planning, "13th Five-Year" plan, in accordance with the requirements of urban and rural housing construction "in 13th Five-Year" outline of the target, main goal of development in the next five years the construction industry is:....

In Sichuan, Deyang Housing Construction Bureau was informed that the Deyang housing authority led by the green building work in an orderly manner. At the end of December 2016, Deyang city has the green building design projects identified a total of 6 (and 2 project review in late December), an area of 420 thousand and 400 square meters. Green construction projects have started 15, covering an area of 1 million 472 thousand and 300 square meters (of which 5 new projects in 2016, covering an area of about 443 thousand and 300 square meters).....

One of the new environmentally friendly building materials as Urumqi ready mixed mortar plans this year to promote energy-saving emission reduction, not only has a significant advantage, but also can greatly improve the working efficiency of the construction unit. This is the 6 day of the reporter from the wall to do that news.....

Learned from the Hebei Provincial Department of housing and urban rural construction, this year the Department adhere to improve building energy efficiency as the core, with innovation of science and technology to lead the development of passive and low energy consumption building, 75% energy saving residential buildings, green building, green building materials and other key, the goal is the construction of passive and low energy consumption building of 100 thousand square meters, building energy accounted for existing urban towns civil construction ratio reached 45%, new urban green building for the new construction area ratio reached 35%, new building materials in new construction projects the average utilization rate of 70%.....

In order to improve the air quality of the environment, the Xi'an Municipal Construction Committee held an energy saving building rule haze to defend the blue sky in the city's deployment mobilization, began full implementation of the "2017 construction of energy-efficient" iron fisted rule Haze - defending the blue sky "implementation plan". From now on, the main city and other districts within 200 thousand square meters of new residential area, must be designed as "green building" two stars. At the same time, from June 1st onwards, the main urban areas, development zones, county construction, renovation and expansion projects, we must use new wall materials. Mandatory implementation of "green building" standards....

The assembled building is made of prefabricated components in site assembly building, design standardization, factory production, assembly of construction and decoration management information integration, and other characteristics, is a significant change to the traditional way of construction. Prefabricated construction can realize unified production, construction and installation industry factory batch, fast building speed, affected by climate conditions, labor saving, greatly improve the quality of construction, the comprehensive cost will be significantly reduced, pollution and waste will be greatly reduced, more in line with the health, safety and environmental protection requirements.....