Low-temperature curing high-leveling low-gloss powder coating for auto parts and preparation method thereof

Abstract

The invention discloses a low-temperature curing high-leveling and low-gloss powder coating for auto parts and a preparation method thereof. The powder coating can be cured at a low temperature of 150-160°C, which not only reduces the energy consumption of the aluminum wheel coating but also increases the toughness of the aluminum wheel; at the same time, the matting curing agent participates in the reaction to achieve the purpose of matting while curing at low temperature. And realized the performance of powder coating ultra-high leveling; By adding modified nano-silica, the hydrophobic ability of the coating is further improved, and the corrosion resistance of the coating is improved; in addition, the powder coating of the present invention also has impact resistance Strong, high flexibility, good adhesion, excellent balance weight adhesion and air permeability, etc., especially suitable for applications in the field of auto parts that require low-temperature curing, high leveling, and low light.

Description

technical field [0001] The invention relates to the field of powder coatings, in particular to a low-temperature curing high-leveling and low-gloss powder coating for auto parts and a preparation method thereof. Background technique [0002] Generally, the curing temperature of powder coating is 180-200°C, but at present, the aluminum alloy wheels for mid-to-high-end cars are made by low-temperature casting process. The mechanical properties will be lost during baking, resulting in a decrease in the toughness of the aluminum wheel hub, causing potential safety hazards; the powder coating is cured at a temperature range of 150-160°C, which not only retains the mechanical properties of the aluminum wheel hub, but also saves energy consumption and reduces carbon dioxide emissions. [0003] At present, the powder coating products of low-temperature curing for automobile aluminum wheels exist and are used, but most of these products are high-gloss types, such as: CN104449268A A k...

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Problems solved by technology

[0002] Generally, the curing temperature of powder coating is 180-200°C, but at present, the aluminum alloy wheels for mid-to-high-end cars are made by low-temperature casting process. The mechanical properties will be lost during baking, resulting in a decrease in the toughness of the aluminum wheel hub, causing potential safety hazards; the powder coating is cured at a temperature range of 150-160 °C, which can not only retain the mechanical properties of the aluminum wheel hub, but also save energy consumption and reduce carbon dioxide emissions

[0003] At present, the powder coating products of low-temperature curing for automobile aluminum wheels exist and are used, but most of these products are high-gloss types, such as: CN104449268A A kind of low-temperature-curing special primer powder coating for automobile aluminum wheels and its preparation method, because large Most matting agents have poor matting effect when cured at low temperature, and cannot achieve high leveling and low light effect powder coatings; although a few powder coatings can achieve matting effect while curing at low temperature by adding traditional catalysts, but due to the fact that the powder is curing The reaction is too fast in the process and it is difficult to ensure the leveling performance, so it is not suitable for use in the field of automotive aluminum wheels

[0004] The existing low-temperature curing low-gloss powder coatings have not been studied on leveling, or although they have high leveling properties, they cannot achieve ultra-high leveling mirror effects, so they cannot be used in automotive parts that require high leveling effects. Field applications, for example: CN106752765A a kind of toughened modified low-temperature curing low-gloss powder coating and its preparation method; CN101747826A a kind of low-temperature curing epoxy low-gloss powder coating and its preparation method; CN1478836 a kind of thermosetting low-temperature curing weather-resistant low-gloss powder coating

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