Yellowing-resistant high-transmittance invisible car cover and preparation method thereof

Abstract

The invention belongs to the technical field of invisible car clothing, and particularly relates to an anti-yellowing high-transmittance invisible car clothing, which is prepared from the following raw materials in parts by mass: 1000 to 1500 parts of polycarbonate diol, 250 to 350 parts of isocyanate, 70 to 100 parts of chain extender, 10 to 20 parts of flatting agent, 10 to 15 parts of catalyst and 2000 to 3000 parts of solvent. The invention provides an anti-yellowing high-transmittance invisible car cover, the raw materials are different from the traditional modification means, the anti-yellowing performance of the system is not mainly improved by an anti-oxidation stabilizer and an anti-ultraviolet aid, and the anti-yellowing high-transmittance invisible car cover is directly prepared from the raw materials by selecting polycarbonate diol and aliphatic isocyanate with relatively low unsaturation as the main raw materials, so that the anti-yellowing high-transmittance invisible car cover is prepared. The anti-yellowing and anti-oxidation coating not only has good anti-yellowing performance and anti-oxidation performance, but also has good transparency and stability. In addition, the invention further provides a preparation method of the anti-yellowing high-transmittance invisible car cover, the preparation method is simple and easy to operate, and the rate of finished products is high.

Description

technical field [0001] The invention belongs to the technical field of invisible car coverings, and in particular relates to a yellowing-resistant high-transparency invisible car covering and a preparation method thereof. Background technique [0002] Invisible car cover, also known as car paint protection film, its function is to protect the car paint from scratches, natural weathering, etc., and to maintain the quality and value of the car's appearance; An important performance of its advantages and disadvantages. The yellowing of the invisible car cover is mainly caused by the aging of the top polyurethane coating. The yellowing of the cover will directly affect its appearance and shorten the service life of the cover. [0003] At present, the means to improve the yellowing resistance of polyurethane coatings are: 1. Absorb or shield ultraviolet light by adding anti-ultraviolet additives; 2. Add nanoparticles such as silicon dioxide to inhibit photocracking and photooxid...

AI Technical Summary

Problems solved by technology

However, the addition of some anti-ultraviolet additives such as carbon black, zinc white or silica nanoparticles, etc., will reduce the transparency of the coating due to their low compatibility with the system and poor dispersion, which limits their use in high-transparency scenarios. and the yellowing index of most polyurethane coatings prepared by means of modification of anti-ultraviolet additives is still high, which cannot meet the yellowing resistance requirements of invisible car clothing under long-term use

For example: Patent No. CN 110467785A, the patent name is an anti-yellowing and anti-ultraviolet car coating film, which discloses a car coating that can effectively anti-yellowing and anti-ultraviolet rays, but the raw material of the car coating contains titanium dioxide, which is compatible with the car coating system. Poor capacity and dispersion, easy to reduce the transparency of the coating

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