Sprayable solvent-free two-component polyurethane putty and preparation method and use method thereof

Abstract

The invention provides sprayable solvent-free two-component polyurethane putty which comprises low-viscosity solvent-free bio-based resin and a low-viscosity polyisocyanate curing agent so that the viscosity of a whole coating mixing system is relatively low; in addition, hydroxyl-terminated polybutadiene-acrylonitrile resin is introduced into a formula system so that the wet adhesion and the flexibility of the system to a metal substrate are improved, and the corrosion resistance of the system is greatly improved. Resin used in the invention is solvent-free soybean oil-based and castor oil-based resin, no volatile component exists, other components are inorganic powder, and no low-boiling-point organic volatile matter exists in the whole formula system so that the product is more environment-friendly, and no flammable and combustible hidden danger exists; compared with an existing solution, three effects of priming paint, putty and floating coat are integrated, the construction linksare greatly reduced, the construction efficiency is improved, and the unit labor cost is reduced; the polyurethane material has better cold temperature performance, and the repair quality is greatly improved.

Description

technical field [0001] The invention relates to a shape repairing material, in particular to a sprayable solvent-free two-component polyurethane putty and its preparation and use method. Background technique [0002] Before the exterior painting of large vehicles and other mechanical equipment, it is necessary to trim the large shape defects on the surface of the substrate to make it consistent with the design. Existing existing solutions are as follows: [0003] The used repairing material is mainly based on unsaturated polyester resin, styrene as active diluent, and talcum powder as the main filling powder. It has high thixotropy and is easy to polish after drying. High-performance paste putty---commonly known as putty. The other is a niche two-component polyurethane putty that uses polyester resin as the main resin, adds a large amount of fillers and additives, and then uses isocyanate resin as the curing agent. This product is currently technically difficult and rarely...

AI Technical Summary

Problems solved by technology

[0005] There is a large amount of active diluent styrene in the atomic ash. This kind of chemical material has a low boiling point and is volatile. It is not only harmful to the human body, but also flammable and explosive, which is very dangerous. The scraped surface requires construction personnel to have certain operating skills; the thixotropy of atomic ash is high, the labor intensity is high during large-scale construction, and the efficiency is low, which greatly increases the process cost (the current labor cost is very high); the drying of atomic ash It is a free radical polymerization reaction of unsaturated polyester, with violent reaction, large shrinkage, and poor adhesion to the substrate; more styrene is often added to the putty to reduce the viscosity, which will cause water resistance and solvent resistance of the system after drying The properties are not good; due to the fast reaction of atomic ash, the mechanical bubbles introduced in the construction process do not have enough time to release, resulting in more trachoma after the system dries, thus leaving shape defects, and multiple constructions are required. Greatly increased labor costs and reduced delivery efficiency; the putty has poor anti-corrosion performance on metal substrates, and the putty is prone to corrosion problems in the case of defective primer spraying

Images