There are many classifications of Hydroxypropylmethylcellulose. According to its uses, Sidley Chemical Co.,Ltd classifies HPMC into two categories, instant soluble and slowly soluble. Slowly soluble HPMC, also known as hot-water soluble HPMC, is also a kind of great used cellulose ether in dry-mixed mortar.
The differences and characteristics between HPMC and common HPMC ethers on the market will help us have better choices during its production and use in future.
Cold-water instant soluble HPMC will form a transparent colloid after quickly dissolved in cold water andwill not agglomerate in cold or hot water. While for common slowly soluble HPMC, namely hot-water soluble HPMC, the main characteristic is that it will agglomerate in contact with cold water but rapidly disperse in hot water until completely disappeared in water. When the temperature decreases gradually, its viscosity will increase slowly until a transparent viscous liquid is formed. Here it should be noted that many users think hot-water soluble HPMC must rely on hot water, which is one-sided. For example, the preparation of putty powder uses all dry mixed materials in the course. In this case, celluloses will be mixed together with other substances, and there will be space between celluloses. Thus, it will not agglomerate in contact with water.
For instant soluble HPMC, when it comes in contact with cold water, it will be rapidly dispersed in cold water, but the rise in viscosity will need time, because in an earlier stage it is only dispersed in water but not really dissolved. It takes about 30 minutes for the viscosity to reach the maximum. The upside of this is that instant soluble HPMC has solved such problems as used in a particular industry, and in cases where dry powder may not be mixed or where dissolution is required for use but hot water cannot be used due to equipment conditions.
In conclusion, we should select appropriate HPMC products in the production process according to different products and processes to maximize the production efficiency and enterprise revenue.