Solvent-free single component polyurethane waterproof paint and production technology thereof

Abstract

The invention discloses a solvent-free single component polyurethane waterproof paint, and relates to the field of waterproof paints. The polyurethane waterproof paint comprises following components:low viscosity bio-based polyether polyol, siloxane modified isocyanate, and glycidyl butyl ether. Metal and amine polyurethane catalysts are not used; a plasticizer or an organic solvent is not needed; and the waterproof paint can quickly cure at a room temperature. The produced solvent-free single component polyurethane waterproof paint has the advantages that the hydrogen bond association between molecules is eliminated, the cohesive energy of the system is reduced, the safety and environmental protection problems of a common polyurethane product are solved perfectly; at the same time, problems caused by using a large amount of low viscosity plasticizers and latent curing agents such as material migration, offensive odor, bad hand feeling, and the like are solved; the solvent-free singlecomponent polyurethane waterproof paint is environmentally friendly, safe, and pollution-free, has a strong substrate binding force, is waterproof and corrosion resistant, and can be applied to waterproof projects that have high requirements on environmental protection.

Description

technical field [0001] The invention relates to the field of waterproof coatings, in particular to a solvent-free one-component polyurethane waterproof coating and a production process thereof. Background technique [0002] The most recognized and widely used architectural waterproof coatings are polyurethane waterproof coatings. It has excellent waterproof performance and moderate price. Its consumption is second only to modified asphalt waterproof membrane and self-adhesive waterproof membrane, and its output accounts for more than 35% of the total waterproof coating. In particular, the solvent-free one-component polyurethane waterproof coating is ready-to-use without mixing, which greatly facilitates the operation of workers. [0003] Polyurethane waterproof coatings have many performance advantages, but their disadvantages are also very obvious, that is, they contain organic solvents. This is the main cause of poisoning and fire accidents, so polyurethane waterproof co...

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Problems solved by technology

[0004] However, the above two methods have their own disadvantages: the method of using plasticizer instead of organic solvent and reducing the proportion of powder filler can indeed reduce the viscosity of the coating within a certain period of time, but as time increases, the plasticizer Plasticizers will gradually migrate out of the coating film, especially low molecular weight plasticizers, which will reduce the elasticity of the coating film, harden and crack, and easily cause water leakage

However, the viscosity of the polyurethane prepolymer itself is relatively large, which leads to a high amount of latent curing agent added, resulting in higher product costs; and when the latent curing agent reacts with water vapor, the small molecule aldehyde gas (such as benzaldehyde, etc.) released has a relatively strong odor. Large, with low toxicity, causing secondary pollution; if stored for a long time, the viscosity of the coating itself will gradually increase due to the absorption of trace moisture by the highly active latent curing agent, which will affect the construction feel

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