Modified acrylic acid waterproof paint and preparation method thereof

Abstract

The invention discloses a modified acrylic acid waterproof paint and a preparation method thereof. The modified acrylic acid waterproof paint is prepared from the following raw materials in parts by weight: 70-100 parts of acrylic monomer, 1-30 parts of polyurethane prepolymer, 0-50 parts of a plasticizer, 0-100 parts of a pigment filler, 0-3 parts of a high-performance assistant, 0.1-3 parts of an accelerant and 0.1-4 parts of an initiator. The invention further discloses the preparation method of the modified acrylic acid waterproof paint. Double bonds are introduced into the polyurethane prepolymer, and the modified acrylic acid waterproof paint is synthesized through free radical polymerization and acrylic monomer copolymerization; and the modified acrylic acid waterproof paint is free of solvent, low in viscosity, high in strength, simple in construction and reliable in quality, and can be applicable to engineering waterproofing of buildings, bridge decks, planting roofs and the like, and the reaction curing process is not affected by temperature and humidity.

Description

technical field [0001] The invention relates to a waterproof coating and a preparation method, in particular to a modified acrylic waterproof coating and a preparation method. Background technique [0002] Polymethyl methacrylate (commonly known as plexiglass) has high strength, small elongation, high glass transition temperature, and its performance cannot meet the requirements of coatings, especially waterproof coatings. However, methyl methacrylate has a wide range of sources, free radical polymerization, simple and controllable, dense coating film, good weather resistance, and can be exposed. [0003] At present, free radical copolymerization of homologues such as butyl methacrylate and octyl acrylate is used. The curing reaction process is not affected by temperature and moderate, low viscosity, good construction performance, but small elongation at break, generally lower than 20%, vitrification High temperature, poor bendability at low temperature. As a waterproof co...

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Problems solved by technology

[0003] At present, free radical copolymerization of homologues such as butyl methacrylate and octyl acrylate is used. The curing reaction process is not affected by temperature and moderate, low viscosity, good construction performance, but small elongation at break, generally lower than 20%, vitrification High temperature, poor bendability at low temperature

As a waterproof coating, a large amount of butyl acrylate, octyl methacrylate, octyl acrylate and other homologues need to be added, and the application prospect is not great

The polyurethane waterproof coating has adjustable strength, large extension, good low temperature flexibility, and low price, but the curing reaction is affected by temperature and humidity. The low temperature response is slow in winter and the high temperature response is fast in summer. One-component polyurethane waterproof coating film is prone to bubbles , Two-component polyurethane waterproof coating requires high proportion accuracy, which is prone to construction quality problems and affects waterproof performance. At the same time, aromatic polyurethane has poor weather resistance and cannot be exposed alone. Aliphatic polyurethane is required for exposure, and the price of aliphatic polyurethane is relatively expensive.

At the same time, polyurethane contains a large number of polar groups and is a polar material, while polymethyl methacrylate is a non-polar material. If the two are mixed directly, the compatibility is poor, and polyurethane will precipitate, resulting in sticky surface or poor performance. , can affect the construction application

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