Low agglomerate waterproof emulsion and preparation method thereof

Abstract

The invention discloses a low agglomerate waterproof emulsion. The emulsion comprises the following components, by mass, styrene 10-18%, methyl methacrylate 2-8%, n-butyl acrylate 8-20%, 2-ethylhexyl acrylate 10-20%, organic acid 0.5-1.5%, functional monomer 0.6-2%, emulsifier 2-3%, pH buffer 0.2-0.4%, redox initiator 0.4-0.8%, and the balance of deionized water. The waterproof emulsion does not contain APEO, and the components scientifically cooperate with each other and have a synergistic effect. Thus the temperature of the emulsion application is suitable for a wide range. The coating film has high bonding strength with base surfaces such as cement, asphalt and polyurethane, and has good water resistance, alkali resistance and weather resistance. Meanwhile, the emulsion has excellent resilience, high practicability, and extremely high promotional value. By optimizing the ratio and the adding method of the emulsifier in a polymerization reaction stage, the preparation method of the waterproof emulsion generates a low amount of aggregates (& lt; 20 ppm), and greatly saves the cost of materials and construction.

Description

technical field [0001] The invention belongs to the technical field of building waterproofing, and in particular relates to a low-condensate waterproof emulsion and a preparation method thereof. Background technique [0002] Compared with pure acrylate copolymers, copolymers of styrene and acrylate monomers have better water resistance, alkali resistance, and higher cost performance, which makes styrene-acrylic emulsions widely used in architectural concrete structures . The flexible polymer network formed by the styrene-acrylic emulsion film can fill the capillary pores formed by the cement during the hydration process, bridge the micro-cracks, and improve the cohesion of the entire concrete structure. Its unique properties are especially suitable for the field of building waterproofing. [0003] The traditional styrene-acrylic emulsion is mainly formed by copolymerization of styrene, butyl acrylate and a small amount of functional monomers. During the reaction process, th...

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Problems solved by technology

[0003] The traditional styrene-acrylic emulsion is mainly formed by copolymerization of styrene, butyl acrylate and a small amount of functional monomers. During the reaction process, the α-H group of the styrene chain segment is very active, and it is easy to combine with acrylate monomer when the amount is large. The detonation of the body will cause a large amount of structural gel to be produced on the inner wall of the polymerization reactor and the stirring shaft, resulting in an increase in the MFFT of the emulsion product and a decrease in the water resistance of the latex film

What's more serious is that the formation of a large number of condensates in the production process makes the utilization rate of raw materials low and the production cost increases. At the same time, it also brings a lot of inconvenience to the cleaning of the reactor and increases unnecessary post-processing costs.