HPMC manufacturer-Cellulose producer analyzes the cause of cracks in putty and its solution
During the construction process of putty powder, the problem of cracks in putty powder is the most troublesome thing for all putty powder customers. In fact, the water-retaining hydroxypropyl methylcellulose HPMC plays a certain role. For this reason, a brief analysis of putty powder cracks in Chenzhou, Shandong Province Questions are as follows:
1) The cracks of the putty layer are generally fine and evenly distributed, not seams but lines. Next, we mainly talk about the cracking of the putty layer. Cement and inorganic binders add too much lime-calcium powder. When the strength is too high, cracks will appear on the outer wall. Voice.
2) The inner and outer walls of the paint layer are loose, and if the dust is not resolved, it is easy to swell and delaminate. If you hit the sound with different hands, there will also be hot and cold cracks with the change of the outside temperature, cracks along the hollow direction, but no cracks are seen. If you open the crack, you will see that the putty and the wall are two layers with a layer of dust in between. To solve these types of walls, first look at the walls, such as serious powder, must be removed clean, scrape the cement before scraping, if not too serious, as long as the surface can be brushed with glue may be full of putty.
3) The unreasonable formula of putty powder will cause problems such as cracks. Generally, the formula of the formula is inversely proportional to the strength and elasticity. The greater the strength, the worse the elasticity, and the easier it is to crack. Adding a certain proportion of putty powder to hydroxypropyl methylcellulose can improve the water retention of putty powder and prevent powder.
4) Tucao is too cracked, the thickness of putty is generally 1-2mm, and no more than 3mm at most. The roughness of some internal and external walls can reach 3-5 cm, if the entire putty powder is flat and flat cracks. It should be leveled with mortar. The larger the error, the thicker the mortar is required, the base layer is built with mortar, and the leveling agent is used to fill the putty.
Cracking cracks: The elasticity of the leveling mortar is not enough, the cracks are large, and the general distribution is uniform.
Insulation cracks: generally show irregular cracks, more common. Grid, mortar, shrinkage and deformation of benzene board, improper construction and many other reasons may cause insulation cracks. Therefore, it should be solved according to the size of the crack, and if it is serious, a grid or grid should be attached. If not serious, use a two-component flexible putty.
Improper selection of equipment, uneven mixing, resulting in cracks.
Hydroxypropyl methylcellulose HPMC with thickening and water retention has good construction performance and high product transparency; Chenzhou cellulose HPMC is often used in mortar, putty powder, caulking agent, grouting agent and other products.
Regarding the performance of cellulose ether products, the putty powder-related issues on the company’s website are specifically introduced, please visit the company’s website.