Polyurethane coating liquid, paint surface protective film and preparation method of paint surface protective film

Abstract

The invention discloses a coating liquid, and particularly relates to a polyurethane coating liquid composed of the following raw materials in parts by weight: 30 to 50 parts of water-based polyol resin, 5 to 12 parts of a water-based curing agent, 100 to 200 parts of a nano silver wire dispersion liquid, 0.5 to 5 parts of 16-sulfydryl hexadecane-1-ol, and 50 to 100 parts of a diluent. Meanwhile, the invention also discloses a paint surface protection film and a preparation method of the paint surface protection film. The water-based polyol resin and the water-based curing agent in the coating liquid are matched with silver nanowires (namely infrared reflection particles) in the silver nanowire dispersion liquid, and an obtained polyurethane coating layer can reflect part of infrared rays in sunlight. Therefore, the technical problem that the polyurethane coating liquid has an infrared reflection effect is solved. When a base material (such as an automobile paint surface protective film) is coated with the coating liquid, part of infrared rays in sunlight can be reflected, and the coating liquid has good infrared reflection durability.

Description

technical field [0001] The invention relates to a coating liquid, in particular to a polyurethane coating liquid. At the same time, the present invention also relates to a paint protection film and a preparation method of the paint protection film. Background technique [0002] Paint protection film, also known as "invisible car cover", is a layer of transparent protective film attached to the surface of the car body. This product not only has the function of self-repairing scratches, but also can effectively prevent scratches and sand. It also isolates the contact between the car paint and the air, which can prevent acid rain, insects, bird droppings, etc. from corroding the paint surface of the car body. [0003] The existing general paint protection film can block the damage of rainwater, ultraviolet rays and pollutants to the paint surface, but it does not have a protective effect on the damage of infrared rays to automobiles. The temperature of the car body exposed to...

AI Technical Summary

Problems solved by technology

However, there are currently two main methods for blocking infrared rays. One is to sputter a special metal layer on the surface of the film. This method is mostly used on the surface of polyethylene terephthalate (PET) hard substrates, TPU or Soft substrates such as PVC soft substrates are not suitable. During installation, they will be stretched and deformed, causing the uniform and dense metal layer to crack, reducing the infrared reflectivity and affecting the appearance of the product.

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