阅读说明：本技术 一种粉末涂料及其应用 (Powder coating and application thereof ) 是由 高庆福 欧阳建群 陈嘉壕 肖龙和 于 2019-10-30 设计创作，主要内容包括：本发明属于材料领域,公开了一种粉末涂料,包括底粉和面粉,所述底粉,包括以下组分：环氧树脂、固化剂、填料、助剂；所述面粉,包括以下组分：聚酯树脂、固化剂、填料、助剂；所述助剂包括流平剂,流平剂通过以下步骤制得：将酮和引发剂混合,加热,加入烯酸和含羟基的聚合物,反应,制得流平剂。相对于现有技术,本发明的粉末涂料中的底粉和面粉都含有流平剂,流平剂一方面含有非极性基团,能使得底粉和面粉相接触的部分混合均匀,另一方面含有亲水基团,能使底粉和面粉带电能力强,底粉和面粉兼容性好,只需一次固化,固化温度不超过180℃,固化后的涂层具有良好的耐候性,例如耐中性盐雾时间可达2000小时,耐酸时间不少于240小时。(The invention belongs to the field of materials, and discloses a powder coating which comprises base powder and flour, wherein the base powder comprises the following components: epoxy resin, curing agent, filler and auxiliary agent; the flour comprises the following components: polyester resin, curing agent, filler and auxiliary agent; the auxiliary agent comprises a leveling agent, and the leveling agent is prepared by the following steps: mixing ketone and initiator, heating, adding olefine acid and hydroxyl-containing polymer, reacting and obtaining the leveling agent. Compared with the prior art, the base powder and the flour in the powder coating disclosed by the invention both contain the leveling agent, the leveling agent contains a nonpolar group on one hand, so that the contacted part of the base powder and the flour can be uniformly mixed, and on the other hand, the leveling agent contains a hydrophilic group, so that the base powder and the flour have strong charging capability, the base powder and the flour have good compatibility, only one-time curing is needed, the curing temperature is not more than 180 ℃, and the cured coating has good weather resistance, such as the neutral salt spray resistance time can reach 2000 hours, and the acid resistance time is not less than 240 hours.)

1. A leveling agent is characterized by being prepared by the following steps:

and mixing ketone and an initiator, adding olefine acid and a polymer containing hydroxyl, and reacting to obtain the leveling agent.

2. The powder coating is characterized by comprising base powder and flour, wherein the base powder comprises the following components: epoxy resin, curing agent, filler and auxiliary agent; the flour comprises the following components: polyester resin, curing agent, filler and auxiliary agent; the adjuvant comprises the leveling agent of claim 1.

3. The powder coating of claim 2, wherein the base powder comprises, by mass, 30 to 70 parts of the epoxy resin, 30 to 70 parts of the curing agent, 1 to 160 parts of the filler, and 0.1 to 10 parts of the auxiliary agent.

4. The powder coating as claimed in claim 2, wherein the flour comprises, by mass, 70-100 parts of polyester resin, 1-20 parts of curing agent, 1-160 parts of filler and 0.1-10 parts of auxiliary agent.

5. The powder coating as claimed in claim 2, wherein the base powder, the curing agent is a polyester resin having an acid value of 10 to 100mgKOH/g and a melt viscosity of 3000-9000 mPa-s at 200 ℃; in the flour, the acid value of the polyester resin is 10-100mgKOH/g, and the melt viscosity at 200 ℃ is 3000-9000mPa & s.

6. The powder coating of claim 2, wherein the auxiliary agent in the powder coating further comprises an ultraviolet absorber and/or a degassing agent.

7. The preparation method of the powder coating is characterized by comprising the following steps:

weighing the components of flour and base powder according to the formula ratio, respectively mixing, extruding, crushing and screening to respectively prepare the base powder and the flour, wherein the powder coating comprises the base powder and the flour.

8. The method of claim 7, wherein the silicon oxide is added after the pulverization.

9. A coating, wherein the powder coating according to any one of claims 2 to 6 is prepared by spraying the base powder onto a substrate, spraying the base powder onto the substrate, and curing the coating.

10. A device comprising the coating of claim 9.

Technical Field

The invention belongs to the field of materials, and particularly relates to a powder coating and application thereof.

Background

Powder coatings are gradually replacing traditional solvent-based coatings due to their outstanding environmental benefits. In the use process of the powder coating in the prior art, a workpiece is firstly sprayed and then cured at a low temperature (lower than 200 ℃), however, the powder coating is often cured twice, so that the energy consumption is high and the operation is complex in the use process of the powder coating. In addition, the coatings formed after curing tend to be poor in weatherability, which is detrimental to the application of powder coatings.

Therefore, it is necessary to provide a powder coating which can be cured at one time and which has excellent weather resistance of a coating layer formed after curing.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. The powder coating is cured once in the using process, the curing temperature is not more than 180 ℃, and in addition, the coating formed by spraying and curing the powder coating has good weather resistance, such as the neutral salt spray resistance time can reach 2000 hours, the acid resistance time is not less than 240 hours, and the alkali resistance time is not less than 200 hours.

Detailed Description

In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are not intended to limit the scope of the claimed invention.