Gypsum-based exterior wall bottom-layer putty and preparation method thereof

Abstract

The invention belongs to the field of building materials and in particular relates to gypsum-based exterior wall bottom-layer putty and a preparation method thereof. The gypsum-based exterior wall bottom-layer putty is prepared from the following raw materials in parts by weight: 1 to 1,000 parts of desulfurization gypsum powder, 1 to 500 parts of cement, 1 to 10 parts of redispersible latex powder, 1 to 500 parts of fly ash, 1 to 5 parts of water-retaining agent, 1 to 3 parts of starch ether and 1 to 3 parts of retarder. After gypsum is combined with water, primary condensation can be finished at room temperature within a few of minutes; final condensation is commonly finished within 30 minutes; the hardening speed is much faster than the hardening speed of a material prepared from the cement and the fireproof performance is good; when a gypsum hardened crystal, i.e., calcium sulfate dihydrate, meets high temperature of flame, crystallized water is evaporated, heat is absorbed and ananhydrous substance with good thermal insulation performance is generated on the surface, so that the effects of stopping flame propagation and temperature rising are realized; the gypsum-based exterior wall bottom-layer putty has certain temperature adjustment and humidity adjustment effects.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a gypsum-based exterior wall bottom putty and a preparation method thereof. Background technique [0002] There are many kinds of putty, but the overall construction is nothing more than one construction. The entire wall surface is cleaned of floating ash and dust, and then the putty is partially scraped and smoothed. The seam of the board is treated with plaster expansion. For the bandage, after it dries, apply the putty for the first time. After it dries, apply the putty for the second time. After the putty is completely dry, check, refill the putty, and apply the putty again. This time is the most important one, and it must be smooth , don't be too thick, wait for the putty to dry and polish it flat, and then apply the first coat of paint. [0003] Due to the wide variety and lack of uniformity, the water-resistant putty cannot prevent cracking, some will lose powder, and so...

AI Technical Summary

Problems solved by technology

[0003] Due to the wide variety and lack of uniformity, the water-resistant putty cannot prevent cracking, some will lose powder, and some will even peel off the shell. At present, most people use cement putty for exterior wall putty. Although cement putty has high strength, But it is rigid, relatively brittle, easy to crack, and hollow

As a result, citizens spend a lot of money, time-consuming and labor-intensive, and the repaired walls are different from the overall color, which affects the appearance

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