Anti-cracking exterior wall putty powder and preparation method thereof

Abstract

The invention discloses anti-cracking exterior wall putty powder. The anti-cracking exterior wall putty powder is prepared from the following raw materials in parts by weight: 60 to 100 parts of puttypowder base material; 15 to 30 parts of heavy calcium carbonate powder; 30 to 50 parts of anti-cracking additive; and 0.3 to 0.5 part of redispersible latex powder. The preparation method comprises the following steps of: (1) adding the putty powder base material and the heavy calcium carbonate powder into a mixer, and stirring the materials for 25-30 minutes at the stirring speed of 550-650r / minto obtain a mixture; and (2) adding the anti-cracking additive and redispersible latex powder into the mixture obtained in the step (1), heating to 60-75 DEG C, stirring again for 30-40 minutes at the stirring speed of 650-750 r / min, and then performing drying. The formula of the anti-cracking exterior wall putty powder is reasonable; the preparation method is simple and easy to implement; the prepared putty powder is good in bonding performance and waterproof performance; polymethyl methacrylate improves the weather resistance of the exterior wall putty powder and can prevent the exterior wall putty powder from cracking; tungsten zirconate can reduce the thermal expansion and cold contraction coefficient of the exterior wall putty powder; the tungsten zirconate is matched with the polymethyl methacrylate to well prevent the exterior wall putty powder from cracking.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an anti-crack exterior wall putty powder and a preparation method thereof. Background technique [0002] Putty powder is a kind of building decoration material. Its main components are talcum powder and glue. It is divided into two types: interior wall and exterior wall. The putty on the exterior wall can resist wind and sun, so it has high gelatinity, high strength and low environmental index. Putty is generally composed of base material, filler, water and additives. Base material, also known as binder, is the most critical component of putty, which mainly plays various roles such as bonding. The most commonly used binders for putty are cement and organic polymers, and organic polymers can be divided into emulsion and latex powder. Cement is a cohesive, durable and cost-effective binder, but has poor tensile strength and crack resistance. Organic polyme...

AI Technical Summary

Problems solved by technology

However, the current putty powder has low bonding strength and poor water resistance. There may be no problems within one or two years, but after a long time, problems such as cracks, peeling, and mildew will appear in the coating.