What are the differences between cold water instant hydroxypropyl methyl cellulose and slow soluble type?

Hydroxypropyl methyl cellulose referred to as HPMC, there are cold water instant type and slow-soluble type, the difference between the two is quite big, below we from the two aspects of the process, should be the field and their respective role to respectively specifically say the difference between the two: Cold water instant hydroxypropyl methyl cellulose is mainly after the surface treatment of glyoxal, if it is put in cold water will quickly dissolve, viscosity up, water solution will become clear and more transparent, so it is really dissolved. And for the slow-soluble hydroxypropyl methyl cellulose, also known as the hot dissolve type, is mainly not after the surface treatment of glyoxal, glyoxal amount is larger, the dispersion is faster, but the viscosity is relatively slow, if the amount of HPMC incorporated is smaller, then the dispersion is slow, but the viscosity is fast.

Cold water instant type and slow-soluble hydroxypropyl methyl cellulose are also different in the application field, the specific difference is as follows:

The main characteristic of cold water instant hydroxypropyl methyl cellulose is that when it meets cold water, it will spread rapidly in cold water, however, its viscosity needs a certain time to rise, because its early HPMC is only in the water rapid diffusion, and this diffusion is not the real sense of dissolution, when its viscosity reaches the maximum, about 40 minutes, the advantage of doing so is that, Can be used in a specific industry, there will be no dry powder mixing, or, when the need to dissolve, and due to equipment conditions and other reasons can not be dissolved in hot water, cold water instant hydroxypropyl methyl cellulose can solve such problems, is often widely used in cement-based mortar, water-based paint and building glue industry, etc. It can mainly play the role of water retention, adhesion and thickening.

The main characteristic of the slow-soluble hydroxypropyl methyl cellulose is that when it encounters cold water, it will automatically bond, however, if it is in hot water, it will quickly diffuse in water, until completely dissolved in water, when the temperature drops, its viscosity will slowly increase, until the formation of a transparent viscous liquid. This kind of bonding situation and the high viscosity of sodium carboxymethyl cellulose dissolution situation is similar, is encountered outside the water of cellulose powder dissolution, thus there is a viscosity, and then wrapped in its has not come into contact with the water of cellulose, however, this situation will gradually dissolve, but the need for a relatively long time. The application of slow-soluble type in mortar is more widely, and the dosage is relatively large, usually used as a water-retaining agent, thickening agent and adhesive, in the ordinary dry mortar, anti-cracking inner and outer wall putty, waterproof mortar, ceramic tile bonding mortar, wall insulation mortar, hydroxypropyl methyl cellulose HPMC- self-leveling field application, gypsum base mortar, high-performance building putty, caulking agent and other materials, Cellulose ether plays a particularly important role.