Low-dosage delustering agent for TGIC system powder coating and preparation method and application of delustering agent

Abstract

The invention belongs to the technical field of powder coatings, particularly relates to a low-dosage delustering agent for a TGIC system powder coating, and further discloses a preparation method andapplication of the delustering agent. The low-dosage delustering agent for the TGIC system powder coating is prepared by taking glycidyl methacrylate, hydroxyethyl acrylate, hydroxypropyl methacrylate, butyl acrylate, acrylonitrile and methacrylate as monomer raw materials and carrying out copolymerization reaction in a xylene solvent system, the low-dosage delustering agent is an acrylate polymer containing special groups such as active hydroxyl, epoxy group and autocatalytic quaternary ammonium salt. When in use, the delustering agent can replace part of TGIC to participate in curing, doesnot need to additionally add a catalyst or wax powder, has good storage and delustering stability, and can be used in a powder coating of a low-dosage TGIC system, and the gloss of a coating film of the delustering agent is reduced to 5% or below.

Description

technical field [0001] The invention belongs to the technical field of powder coatings, in particular to a matting agent for powder coatings of a low-consumption TGIC system, and further discloses its preparation method and application. Background technique [0002] Powder coating is a 100% solid powder that does not contain organic solvents. It is different from oil-based paints and water-based paints. It does not use solvent or water as a dispersion medium when coating, but uses air as a dispersion medium to evenly coat the workpiece. The surface is a new type of environmentally friendly paint that forms a special-purpose coating film after heating. Powder coating has the advantages of no VOC, environmental protection, energy saving, high construction efficiency and wide application range. With its advantages of economy, environmental protection, high efficiency and excellent performance, it is gradually replacing organic solvent-based coatings and has become an important ...

AI Technical Summary

Problems solved by technology

However, the shortcomings of this solution are mainly reflected in: (1) the acid value of the added matting agent is too high, greater than 250mgKOH / g, and the use of matting agent will consume additional curing agent TGIC, so it is necessary to increase the consumption of TGIC in the powder coating formulation, and then Causes an increase in the cost of powder coatings; (2) The physical mixing of multiple components makes it difficult for the matting agent to mix evenly with the main resin and curing agent during preparation and application, especially because the amount of the added catalyst is small. If there is a problem with the matting property, it will easily lead to poor matting stability, and the difference between batches of matting powder will be large, which will bring great changes to the production of matting powder coatings.

[0004] In addition, as disclosed in the Chinese patent CN109575670A, the matting agent of indoor hybrid powder coatings is also obtained by mixing carboxyl acrylic resin and epoxy acrylic resin with a catalyst. However, the product still has the following shortcomings: (1) Due to the large amount of styrene used as the main monomer component of acrylic resin, the product has poor weather resistance and cannot be used in outdoor systems, such as TGIC curing system; (2) The matting agent uses a combination of carboxyl acrylic resin, epoxy acrylic resin and catalyst at the same time, although it can reduce the extra consumption of epoxy curing agent in the powder coating system and play a compensatory role, but due to the combination of carboxyl and Epoxy groups are prone to cross-linking during screw extrusion, and are also prone to cross-linking when stored for a long time under the action of a catalyst, resulting in insufficient storage stability of the matting agent itself, especially when stored at high temperature in summer; (3) Same as the scheme in the aforementioned patent CN110982319A, it is formed by physical mixing of multiple components, and it is easy to cause the matting agent itself to be difficult to mix evenly with the main resin and curing agent during preparation and subsequent application, especially once the added catalyst Problems with mixing uniformity will easily lead to poor matting stability, and large differences between batches of matting powder will bring great inconvenience to the production of matting powder coatings. In addition, this product consumes additional TGIC curing agent, which requires an additional increase in the amount of TGIC. Therefore, it is not suitable for powder coatings with low dosage of TGIC system.

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