Powder coating composition and method for preparing thickness-controllable electrostatic spraying coating by powder coating composition

A technology of powder coating and electrostatic spraying, which is applied in coatings, conductive coatings, polyamide coatings, etc. It can solve problems such as the difficulty of thick coating, the decrease of the surface conductivity of the workpiece, and the inability to re-spray electrostatically, achieving mild conditions , good interaction and broad application prospects

Active Publication Date: 2022-04-08
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, for existing powder coating products, after an electrostatic spraying film-forming operation, the electrical conductivity of the workpiece surface decreases, and electrostatic spraying ca

Method used

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  • Powder coating composition and method for preparing thickness-controllable electrostatic spraying coating by powder coating composition
  • Powder coating composition and method for preparing thickness-controllable electrostatic spraying coating by powder coating composition
  • Powder coating composition and method for preparing thickness-controllable electrostatic spraying coating by powder coating composition

Examples

Experimental program
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Example Embodiment

[0057] Example 1

[0058] Preparation of insulating treated conductive fillers:

[0059] The insulating treated conductive filler (hereinafter referred to as the conductive filler), the specific preparation method is as follows: the insulating thermoplastic resin and the conductive material powder are mixed according to a certain mass ratio, and the thermoplastic resin can be polyolefin resin, polyamide resin, One or more mixtures of thermoplastic polyester resin, fluorocarbon resin, etc.; the conductive material powder can be metal (gold, platinum, silver, copper, iron, aluminum, zinc, magnesium and alloy powder, etc.), conductive material A mixture of one or more conductive powders such as carbon materials (activated carbon, graphite, carbon nanotubes, graphene, etc.), conductive polymers (polyacetylene, polyaniline, polythiophene, polypyrrole, etc.). Table 1 presents six representative composition formulations, it is obvious that the described formulations are only a part ...

Example Embodiment

[0064] Example 2

[0065] Preparation of polymer resins with ionizable groups:

[0066] The described polymer resin with ionizable groups (hereinafter referred to as ionization resin) is a sulfonic acid group, or a sulfonate group, or a carboxylic acid group, or a carboxylate group, or an amino group, Alternatively, the polymer resin with one or more ionizable groups such as ammonium salt groups can be either commercially available resin powders or designed and synthesized resin powders. Four representative ionizing resins are given in Table 2 below. Obviously, the types of resins described are only a part of the applicable ionizing resins in the present invention, not all of the applicable ionizing resins.

[0067] Table 2 Four representative ionizing resins

[0068] sample name Resin type parameter Ionizing resin 1# Sulfonated polyphenylene sulfide powder Homemade, sulfonation degree 3.5% Ionizing resin 2# Sulfonated polyphenylene sulfide powd...

Example Embodiment

[0071] Example 3

[0072] Preparation of base powder:

[0073]The base powder material comprises thermosetting resin, thermoplastic resin, conductive filler treated with insulation, polymer resin with ionizable groups, thermosetting powder coating curing agent and additives. Table 3 presents the composition formulations of four representative base powders. Obviously, the described formulations are only a part of the formulations applicable to the present invention, not all formulations.

[0074] Table 3 Four kinds of representative base powder composition formula

[0075]

[0076] In the above table, PPS is the abbreviation of polyphenylene sulfide, PTFE is the abbreviation of polytetrafluoroethylene, and HDPE is the abbreviation of high density polyethylene.

[0077] The components in the above table are all powders with a particle size of no more than 100 meshes, which are added to the powder mixer in proportion, fully mixed, and then passed through a 100-mesh sieve and...

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Abstract

The invention provides a powder coating composition and a method for preparing a thickness-controllable electrostatic spraying coating by using the powder coating composition. The powder coating composition is composed of a base layer powder material and a surface layer powder material, the base layer powder material is composed of thermosetting resin, thermoplastic resin, conductive filler subjected to insulation treatment, polymer resin with ionizable groups, a thermosetting powder coating curing agent and an additive; and the surface layer powder material consists of thermosetting resin, thermoplastic resin, a thermosetting powder coating curing agent, pigment and an additive. Compared with the prior art, the powder coating composition provided by the invention adopts the components with specific contents, better interaction is realized, and by utilizing the powder coating composition, on one hand, multi-layer electrostatic spraying and thick spraying with adjustable coating thickness can be realized, and on the other hand, damage repair, renovation and color change operation of the coating can be conveniently realized.

Description

technical field [0001] The invention relates to the technical field of powder coatings, in particular to a powder coating composition and a method for preparing a thickness-controllable electrostatic spray coating. Background technique [0002] Powder coating, as a new type of coating, does not contain solvents and is environmentally friendly. According to the properties of the main film-forming substances, powder coatings are divided into two categories: thermoplastic powder coatings and thermosetting powder coatings; according to the coating method and existing state, they can be divided into electrostatic spraying powder coatings, fluidized bed dipping powder coatings, and electrophoretic powder coatings. , UV-curable powder coatings and water-dispersed powder coatings, etc. Among them, electrostatic powder spraying charges the coating powder through friction or corona discharge, and then adsorbs on the surface of the workpiece, and then heats the workpiece with the adso...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D181/02C09D127/18C09D177/06C09D133/00C09D123/06C09D161/06C09D175/04C09D5/24C09D7/61B05D1/06B05D3/02B05D7/24
Inventor 孙志强庞烜林里张涵李帅陈学思
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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