Viscosity of cellulose ethers in different scenarios（1）
Viscosity of cellulose ethers in different scenarios（2）
(6) In stucco plaster, bonding plaster and inlay plaster.
With the rapid development of the construction industry, people’s demand for new building materials is also increasing day by day. Due to the increase in people’s awareness of environmental protection and the continuous improvement in construction efficiency, gelling material plaster products have developed rapidly. At present, the most common plaster products are stucco plaster, bonding plaster, embedded plaster, tile adhesive and so on.
Plaster is an excellent quality plastering material for interior walls and roofs. The wall surface plastered with it is delicate and smooth, does not fall off the powder and the substrate is firmly bonded, no cracking and falling off phenomenon, and has the function of fire prevention.
Bonding plaster is a new type of building light board binder, is based on gypsum, add a variety of additive mouth agent and made of adhesive material. It is suitable for bonding between all kinds of inorganic building wall materials. It has the characteristics of non-toxic, tasteless, early strength, fast setting and firm bonding. It is a matching material for construction of building boards and blocks.
Gypsum caulking is a gap filler between gypsum sheets and a repair filler for walls and cracks. These gypsum products have a range of different functions, in addition to gypsum and related fillers play a role, the key issue is the addition of cellulose ether additives play a leading role.
As gypsum is divided into anhydrous and semi-hydrous gypsum, different gypsum has different effects on the performance of the product, so thickening, water retention and slow setting determine the quality of gypsum building materials. A common problem with these materials is that they are hollow and cracked, and their initial strength is not achieved. The solution to this problem is to choose the type of cellulose and the retarder compound to utilise the method problem.
In this regard, the general choice of methyl or hydroxypropyl methyl 30,000 – 60,000 cps, the amount added is between 1.5% – 2%, cellulose from which the focus is on water retention and slow coagulation lubrication role.
However, in this to rely on cellulose ether as a retarding agent is not achieved, must also add citric acid retarding agent mixed with the use of the initial strength will not affect. Water retention is generally defined as the amount of water lost naturally without external absorption. If the wall is too dry, the water absorption and natural evaporation of the substrate will cause the material to lose water too quickly. The same will happen with hollow drums and cracks. This method of use is for dry powder mixing, if the preparation of the solution can be referred to the solution preparation method.
Landcel is a company specialising in the development and production of HPMC with many years of experience. We have experience in the development of HPMC for all aspects of its application.