The level of building glue is a problem for customers. First, the level of building glue should take into account the raw materials. The key reason for building adhesive layers is the incompatibility between acrylic emulsion and hydroxypropyl methylcellulose (HPMC). Second, due to insufficient mixing time; There are also poor thickening characteristics of building glue. In building glue, it is important to use instant coffee hydroxypropyl methylcellulose (HPMC), because HPMC is only dispersed in water, it does not really dissolve. After about 2 minutes, the viscosity of the liquid slowly increases, producing a fully transparent viscous colloidal solution. Hot melt commodities, encounter cold water, can be quickly dispersed in boiling water, in boiling water subsided. When the temperature drops to a certain temperature, viscosity retardation occurs until a fully transparent viscous colloidal solution is produced. Building glue hydroxypropyl methyl cellulose (HPMC) in the highly recommended use of 2-4 kg.

Hydroxypropyl methyl cellulose (HPMC) in the building glue in the physical properties of stable, mildew lock effect is very good, will not be harmed by the change of PH value, viscosity can be applied in the middle of 100,000 s to 200,000 s but in the production and manufacturing, the higher the better the viscosity. Viscosity is inversely proportional to adhesive compressive strength. The higher the viscosity, the lower the compressive strength. General viscosity 100,000 s is appropriate.

Now decoration industry, hydroxypropyl methyl cellulose application is more stringent.

How can this quantity be manipulated? Take you through:

Immediately mix CMC with water to make a muddy adhesive reserved. When installing CMC paste, a certain amount of cold water is added to the batching pot with a stirring machine. When the stirring machine starts, the carboxymethyl cellulose slowly and evenly sprinkled into the ingredients tank, continue to mix, make carboxymethyl cellulose and water thoroughly fused, carboxymethyl cellulose thoroughly dissolved. When dissolving the management committee, it is often necessary to disperse evenly and keep mixing, in order to better “prevent the formation and formation of the management committee after meeting water, and reduce the problem of the dissolution of the management committee” and improve the dissolution rate of the management committee.

The mixing time is different from the time for the CMC to dissolve completely. It’s two definitions. Generally, the mixing time is much shorter than the time for the CMC to dissolve completely, depending on the details. The determination of the mixing time is based on the ability to terminate the mixing when the CMC is evenly dispersed in the water without significant clumps, allowing the CMC and water to infiltrate into each other under static data standards. Resolve the time required for CMC to dissolve completely for several reasons:

(1)CMC and water are completely fused, and there is no solid-liquid separation equipment between each other;

(2) the mixture is symmetrical and general, and the surface layer is smooth and moist;

(3) After mixing, the paste has no color and is completely transparent, and there is no particulate matter in the paste. From the CMC fund input ingredients tank and water mixture to complete dissolution must be 10~20 hours.