| About putty powder easy to powder of the problem, or the strength can not reach what. All know that the putty powder need to add cellulose ether, many users do not redispersible emulsion powder. Many people in order to save costs, without rubber powder, but this is why ordinary putty easy to powder, easy to appear product quality problems key! Ordinary putty (e.g. 821 putty) is mainly composed of chalk, add a little starch adhesive and CMC (carboxymethyl cellulose) made of methyl cellulose is also used with SF powder putty, such no adhesion, water resistance. Cellulose and water dissolved after absorbing water, the water absorption rate of different products from different manufacturers, play a role in cellulose water putty, drying after the putty is only temporary has a certain strength, but after a long time will slowly off the powder, which is closely related to the molecular structure of cellulose itself. Such putty, loose, high water absorption, easy to powder, no strength, no elasticity. If it is constructed with top coat, low PVC is easy to foam; high PVC is easy to dehydrate, contract and crack; because of its high water absorption, it affects the film formation and construction effect. To improve the above problems can adjust the putty, putty formulation, appropriate to add some redispersible emulsion powder, improve the later strength of putty, the choice of a quality assurance of the quality of HPMC hydroxypropyl methyl cellulose, hydroxypropyl methyl cellulose Shanghai Rong European Chemical Co. Ltd. in high quality cellulose excellent water retention rate can make full of water putty materials so as to improve the quality. In the production process of putty, if it can be dispersed, the amount of emulsion powder is not enough, or the use of inferior putty special latex powder, putty powder will have any impact? Putty redispersible powder content, the most direct manifestation is putty layer loose powder surface, besmear to brush paint consumption of a large quantity of paint, leveling, film surface roughness, it is difficult to form a dense film. Such walls prone to film peeling, blistering, peeling, cracking and other phenomena. If you choose inferior putty powder, wall generated, such as formaldehyde and other harmful gases, the degree of injury to others is obvious. If you want to change the status quo, you must remove all the inferior putty, leave no residual, and then buy qualified putty and latex paint! In order to avoid unnecessary losses, customers in the putty selection is convenient, as far as possible to choose large brands, quality assurance products. |
