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The use of mortar as an insulation material in building construction can improve the insulation performance of the outer wall insulation layer, reduce indoor heat loss, and avoid uneven heating between rooms, so it has been widely used in building construction.

1. The pure hydroxypropyl methyl cellulose HPMC looks fluffy and has a small bulk density, ranging from 0.3-0.4/ml; while the fake hydroxypropyl methyl cellulose has better fluidity and feels better It is heavy, which is significantly different from the original appearance.

Instant HPMC disperses quickly in cold water and disappears in the water. At this time, the liquid has no viscosity, because HPMC is only dispersed in water without real dissolution. In about 2 minutes, the viscosity of the liquid gradually increased, forming a transparent viscous colloid.

Generally, in the synthesis of hydroxypropyl methylcellulose, the refined cotton cellulose is treated with alkali solution at 35-40°C for half an hour, squeezed, the cellulose is crushed, and appropriately aged at 35°C, so that the resulting alkali fiber is averagely polymerized The degree is within the required range.

The first step in the production of redispersible polymer powders is the production of polymer dispersions, also known as emulsions or latexes.  the water-emulsified monomers (stabilized by emulsifiers or macromolecular protective colloids) react with initiators to start emulsion polymerization.

1. Products without surface treatment (except hydroxyethyl cellulose) shall not be directly dissolved in cold water.

2. It must be slowly sifted into the mixing container. Do not add the product that has formed into lumps into the mixing container directly.

It is added directly during production. This method is the simplest and shortest time-consuming method. The specific steps are:

1. Add a certain amount of boiling water to a stirred container with high shear stress (hydroxyethyl cellulose products are soluble in cold water, so just add cold water);

2. Start the mixing at low speed, and slowly sieve the product into the mixing container;

Physical and chemical properties:
1. The appearance is white or almost white powder
2. Granularity: 100 mesh pass rate ≥ 98% 80 mesh pass rate ≥ 100%
3. Carbonization temperature: 280-300℃
4. Surface tension: 42-56dyn/cm for 2% aqueous solution

The importance of the mortar retention of hydroxypropyl methyl cellulose in the mortar is why it has high requirements for water retention. Hydroxypropyl methyl cellulose is a kind of non-ionic cellulose mixed ether. A semi-synthetic, inactive, viscoelastic polymer, often used in ophthalmology as a lubrication department, or as an excipient or excipient in oral medicine, it can be said that it is common in various kinds of commodities.