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What are the two common types of common cellulose ethers?

2018-12-13 19:44:00  View:
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


Ⅲ, Cellulose ether is divided into slow soluble cellulose ether and cold water soluble cellulose ether.
1) Slow soluble cellulose ether dissolved in water after the viscosity of very quickly (that is, in water immediately after the viscosity), but in cold water dissolution rate is slow, stirring is not good, easy to lump together
2) The fast cellulose ether dissolves in water, but the viscosity is very slow, but the dissolution rate is very fast. This is the most fundamental problem of both.


Ⅳ, the production of putty powder and putty paste, whether with a cellulose ether can be?
1) Putty powder method is usually used after the water mixing ratio of good products at the construction site, stir well after directly on the wall. In the process of cellulose ether in water after dissolving fast on the viscosity, mixing time and construction time of cellulose ether water are very close to the general choice of viscosity quickly. The only way it in the construction process will play a role in bonding. People might worry about the problem of dissolved putty, in fact, cellulose ether with talc powder and other materials, in the process of using dry powder mixing, that it and other substances mixed together between the particles and fiber particles with each other interval in this case, encounter water, would not have spread. Together, on the wall hanging there won't be bad. The problem of dissolution.
2) Putty paste production mode is very special, it needs to be dissolved after cellulose ether, then mix with other raw materials, which requires quick dissolving cellulose ether, if it will affect the viscosity fast uniformity of cellulose ether and other raw materials, products lead to uneven mixing, appear the phenomenon of agglomeration. The impact of construction quality. Be sure to choose different products according to the different needs of the product.
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