阅读说明：本技术 一种公路环氧锌基防腐粉末涂料及其制备 (Epoxy zinc-based anticorrosive powder coating for roads and preparation thereof ) 是由 宋玉婷 王磊 马春霞 史威威 郑浩 于 2020-12-01 设计创作，主要内容包括：本发明涉及一种公路环氧锌基防腐粉末涂料及其制备,属于静电粉末涂料技术领域。所述粉末涂料由双酚A环氧树脂、酚类环氧树脂用固化剂、咪唑类或环咪类环氧树脂用固化促进剂、鳞片状锌粉填料、助剂组合以及超细硫酸钡填料组成,助剂组合为788流平剂、安息香和701增光剂的混合物,通过调控所述粉末涂料中各成分的含量使其具有良好的耐候性、耐盐雾、耐冲击性能,而且与钢基体具良好的粘结性能,能够满足公路护栏的防护需求；另外,所述粉末涂料的制备工艺简单,成本低,具有很好的应用前景。(The invention relates to a highway epoxy zinc-based anticorrosive powder coating and a preparation method thereof, belonging to the technical field of electrostatic powder coatings. The powder coating consists of bisphenol A epoxy resin, a curing agent for phenolic epoxy resin, a curing accelerator for imidazole or cycloimidazole epoxy resin, flaky zinc powder filler, an auxiliary agent combination and superfine barium sulfate filler, wherein the auxiliary agent combination is a mixture of a 788 flatting agent, benzoin and a 701 brightener, and the powder coating has good weather resistance, salt mist resistance and impact resistance by regulating and controlling the content of each component in the powder coating, has good bonding performance with a steel matrix, and can meet the protection requirement of a highway guardrail; in addition, the powder coating has the advantages of simple preparation process, low cost and good application prospect.)

1. A road epoxy zinc-based anticorrosive powder coating is characterized in that: the powder coating comprises the following components in parts by weight: 480-550 parts of bisphenol A epoxy resin, 110-125 parts of curing agent for phenol epoxy resin, 5-10 parts of curing accelerator for imidazole or cyclic imidazole epoxy resin, 50-100 parts of flaky zinc powder, 20-30 parts of assistant composition and 230-320 parts of superfine barium sulfate;

the auxiliary agent combination comprises a 788 flatting agent, benzoin and a 701 brightener, wherein the mass ratio of the 788 flatting agent to the benzoin to the 701 brightener is 3:1: 3.

2. The epoxy zinc-based anticorrosive powder coating for roads of claim 1, characterized in that: the bisphenol A epoxy resin is bisphenol A epoxy resin E12 or bisphenol A epoxy resin E20.

3. The epoxy zinc-based anticorrosive powder coating for roads of claim 1, characterized in that: the curing agent for the phenolic epoxy resin is a hexa-agilawood SA2830 curing agent or a hexa-agilawood SA2831 curing agent.

4. The epoxy zinc-based anticorrosive powder coating for roads of claim 1, characterized in that: the curing accelerator for the imidazole or cyclomedan epoxy resin is a hexaazatada SA31 curing accelerator or a Huangshan Xinjia HB60 curing accelerator.

5. The epoxy zinc-based anticorrosive powder coating for roads of claim 1, characterized in that: the particle size of the flaky zinc powder is 5-10 mu m.

6. The epoxy zinc-based anticorrosive powder coating for roads of claim 1, characterized in that: the particle size of the powder coating is 35-38 mu m.

7. A process for preparing a zinc epoxy-based anti-corrosive powder coating for roads according to any of claims 1 to 6, characterized in that: the steps of the method are as follows,

adding bisphenol A epoxy resin, curing agent for phenol epoxy resin, curing accelerator for imidazole or cyclic imidazole epoxy resin, flaky zinc powder, auxiliary agent combination and superfine barium sulfate into a mixer, uniformly mixing, adding into an extruder with the extrusion temperature of 90-100 ℃ for melting, mixing, extruding, cooling and tabletting, crushing and sieving to obtain the powder coating.

Technical Field

The invention relates to a highway epoxy zinc-based anticorrosive powder coating and a preparation method thereof, belonging to the technical field of electrostatic powder coatings.

Background

The road guardrail is influenced by special environments such as insolation, wind and rain erosion and the like all the year round and is often subjected to the problem of steel corrosion, and the corrosion is a main reason of the failure of metal steel components and is always a problem worthy of attention. Through decades of development, China gains remarkable performance in the technical field of anticorrosion treatment, such as hot dip galvanizing, hot dip aluminizing and the like, but with the concept of 'green and environment protection' gradually getting deeper into the mind, the advanced foreign countries eliminate the workshop-type process from the beginning of the 20 th century and the 80 th century, develop a new process of 'environment protection and energy conservation' and realize the aims of stable and reliable quality and environmental protection.

According to the principle that the anodic oxidation of metal zinc can improve the corrosion resistance of a steel matrix, inorganic zinc-rich primer and organic zinc-rich primer are developed domestically and successfully applied to corrosion prevention construction of various steel structures, but the existing zinc-rich primer still has the unsatisfactory defects of environmental pollution, high cost and the like common paint. The zinc epoxy powder coating is taken as a main variety of industrial anticorrosive coatings, and appears in large and small anticorrosive industrial projects by virtue of the characteristics of no pollution, no solvent, recoverability, environmental protection, good anticorrosive performance and the like, and is generally accepted by people. However, in the actual production of the highway guardrail at present, the phenomenon of poor corrosion resistance and even plastic removal can occur when customers use the epoxy zinc-based powder coating, and the requirement of protecting the highway guardrail can not be met.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the epoxy zinc-based anticorrosive powder coating for the highway and the preparation process method thereof, and the components and the content of the powder coating are optimized, so that the powder coating has good weather resistance, salt mist resistance and impact resistance, has good bonding property with a steel matrix, can realize long-term protection on the steel matrix, and meets the protection requirement of a highway guardrail; in addition, the powder coating has the advantages of simple preparation process, low cost and good application prospect.

The purpose of the invention is realized by the following technical scheme.

The epoxy zinc-based anticorrosive powder coating for the highway comprises the following components in parts by weight: 480-550 parts of bisphenol A epoxy resin, 110-125 parts of curing agent for phenol epoxy resin, 5-10 parts of curing accelerator for imidazole or cycloimidazole epoxy resin, 50-100 parts of zinc-rich filler, 20-30 parts of assistant combination and 230-320 parts of weather-resistant filler;

the zinc-rich filler is flaky zinc powder, and the particle size is preferably 5-10 mu m;

the auxiliary agent combination comprises a 788 flatting agent, benzoin and a 701 brightener, wherein the mass ratio of the 788 flatting agent to the benzoin to the 701 brightener is 3:1: 3;

the weather-resistant filler is superfine barium sulfate.

Further, the bisphenol a epoxy resin is preferably bisphenol a epoxy resin E12 or bisphenol a epoxy resin E20.

Further, the curing agent for the phenolic epoxy resin is preferably a hexaandropan SA2830 curing agent or a hexaandropan SA2831 curing agent.

Furthermore, the curing accelerator for the imidazole or cycloimide epoxy resin is preferably hexaazaroda SA31 curing accelerator or Huangshan Xinjia HB60 curing accelerator.

Further, the particle size of the powder coating is preferably 35 to 38 μm.

The preparation method of the epoxy zinc-based anticorrosive powder coating for the highway comprises the following steps:

adding bisphenol A epoxy resin, curing agent for phenol epoxy resin, curing accelerator for imidazole or cycloimidazole epoxy resin, zinc-rich filler, auxiliary agent combination and weather-resistant filler into a mixer, uniformly mixing, adding into an extruder with the extrusion temperature of 90-100 ℃ for melting, mixing, extruding, cooling and tabletting, crushing and sieving to obtain the powder coating.

Has the advantages that:

the powder coating disclosed by the invention is non-toxic, pollution-free and low in cost, has good weather resistance, salt spray resistance and impact resistance, has good bonding performance with a steel matrix, can realize long-term protection on the steel matrix, and meets the protection requirement of a highway guardrail. In addition, the powder coating disclosed by the invention is simple in preparation process, simple in construction and good in application prospect.

Detailed Description

The present invention is further illustrated by the following detailed description, wherein the processes are conventional unless otherwise specified, and the starting materials are commercially available from a public source without further specification.

Example 1

The epoxy zinc-based anticorrosive powder coating for the highway comprises the following components in parts by weight: bisphenol A epoxy resin E12550 parts, hexa-agilawood SA2830 curing agent 110 parts, hexa-agilawood SA31 curing accelerator 10 parts, scaly zinc powder with the particle size of 5-10 mu m 60 parts, 788 leveling agent 9 parts, benzoin 3 parts, 701 brightening agent 9 parts and ultrafine barium sulfate 249 parts.

Adding bisphenol A epoxy resin E12, a hexa-agilawood SA2830 curing agent, a hexa-agilawood SA31 curing accelerator, flaky zinc powder, a 788 leveling agent, benzoin, a 701 brightening agent and superfine barium sulfate into a mixer, uniformly mixing, adding into an extruder with the extrusion temperature of 90-100 ℃, melting, mixing, extruding, cooling and tabletting, crushing and sieving to obtain the highway epoxy zinc-based anticorrosive powder coating with the particle size of 35-38 mu m.

Example 2

The epoxy zinc-based anticorrosive powder coating for the highway comprises the following components in parts by weight: bisphenol A epoxy resin E12480 parts, hexa-agilawood SA2830 curing agent 120 parts, hexa-agilawood SA31 curing accelerator 10 parts, flaky zinc powder 80 parts with particle size of 5-10 micrometers, 788 leveling agent 9 parts, benzoin 3 parts, 701 brightening agent 9 parts and ultrafine barium sulfate 289 parts.

Adding bisphenol A epoxy resin E12, a hexa-agilawood SA2830 curing agent, a hexa-agilawood SA31 curing accelerator, flaky zinc powder, a 788 leveling agent, benzoin, a 701 brightening agent and superfine barium sulfate into a mixer, uniformly mixing, adding into an extruder with the extrusion temperature of 90-100 ℃, melting, mixing, extruding, cooling and tabletting, crushing and sieving to obtain the highway epoxy zinc-based anticorrosive powder coating with the particle size of 35-38 mu m.

The powder coating prepared in the embodiment 1-2 is sprayed on a steel substrate to form a coating, and then the performance of the coating is tested, wherein the quality index and the testing method are shown in table 1, and the specific testing result is detailed in table 2. Wherein, the weather resistance test refers to national standard GB/T18226-2015, which is tested for the epoxy zinc-based polyester composite coating, so that the epoxy zinc-based powder coating is sprayed on a steel substrate, the pure polyester powder coating is continuously electrostatically sprayed after the epoxy zinc-based powder coating is cured, and then the test is carried out.

TABLE 1

TABLE 2

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.