Single-component exposed acrylic acid modified polyurethane waterproof paint and preparation method

Abstract

The invention provides single-component exposed acrylic acid modified polyurethane waterproof paint and a preparation method. The modified polyurethane waterproof paint is prepared from the following raw materials in parts by weight: 5 to 20 parts of isocyanate, 20 to 40 parts of hydroxyl terminated polyether, 2 to 10 parts of acrylate, 0.2 to 5 parts of a latent curing agent, 5 to 15 parts of a plasticizer, 5 to 20 parts of a solvent, 10 to 40 parts of pigment filling, 0.2 to 1 part of a catalyst, 0.1 to 1 part of a chain transferring agent, 0.2 to 1 part of an initiator and 0.1 to 1 part of a high-temperature auxiliary agent. The invention further provides the preparation method of the single-component exposed acrylic acid modified polyurethane waterproof paint. The single-component exposed acrylic acid modified polyurethane waterproof paint provided by the invention has the advantages of high strength, dense thin film and reliability of construction; the polyurethane waterproof paint has good weather resistance; the single-component polyurethane waterproof paint has a good waterproof performance, also has excellent weather resistance and high brightness and is suitable for construction of exposed base planes.

Description

technical field [0001] The invention relates to a modified polyurethane waterproof coating and a preparation method, in particular to a one-component exposed acrylic modified polyurethane waterproof coating and a preparation method. Background technique [0002] Polyurethane waterproof coating is a chemical reaction type waterproof coating. After curing, it is a rubber-like high-elastic coating film. The coating film is seamless as a whole. Because of its excellent comprehensive performance, it is called "liquid coil" by the industry. widely used within. After more than 20 years of development, my country's polyurethane waterproof coatings have a wide range of products and excellent performance, occupying an important position in the construction waterproof industry. However, most of the polyurethane products on the market are aromatic polyurethanes, that is, the isocyanate monomers used are aromatic isocyanates. Aromatic polyurethanes cannot be used for exposed constructi...

AI Technical Summary

Problems solved by technology

However, the traditional one-component polyurethane waterproof coating uses aromatic isocyanate, and the curing mechanism is that the prepolymer containing -NCO end groups reacts with the base layer or moisture in the air to form a film, and releases CO 2 Therefore, the traditional one-component polyurethane waterproof coating is easily disturbed by the humidity of the construction environment during the construction process, and the construction cannot be thickly coated, and the cured coating film is prone to non-compactness, air bubbles and pinholes.

In addition, the traditional one-component polyurethane has low strength. If it is applied to the exposed type, it can not guarantee the weather resistance, and it is easy to be affected by external forces and cause cracking, which will affect the construction performance.

[0004] In summary, acrylic waterproof coatings have excellent weather resistance, but poor physical properties and low-temperature flexibility, while polyurethane coatings have good physical properties and low-temperature flexibility, but poor weather resistance

If the combination of the two is simply adopted, and the acrylic resin is added to the polyurethane prepolymer, the acrylic resin will be precipitated, and the effect of complementary advantages of the two cannot be achieved.

Images