阅读说明：本技术 一种常温快速干燥的石墨高温抗氧化剂及其应用 (Graphite high-temperature antioxidant capable of being rapidly dried at normal temperature and application thereof ) 是由 吴相福 陈香萍 田家利 邓达琴 洪文晶 李海航 李江标 刘春根 邓聪秀 于 2020-07-24 设计创作，主要内容包括：本发明提供了一种常温快速干燥的石墨高温抗氧化剂,包括磷酸盐、硅烷偶联剂、硅溶胶、表面活性剂和溶剂。其应用方法,先将石墨基材表面进行预处理,然后采用常温快速干燥的石墨高温抗氧化剂对石墨基材进行真空加压浸渍,再将其置于常温环境下静置0.5-1小时即可。该常温快速干燥的石墨高温抗氧化剂充分润湿石墨块且进入气孔,封闭气孔,并且形成保护层,从而达到隔绝石墨与氧气的作用,起到高温抗氧化的效果。该耐高温涂层具有良好的抗氧化作用,对石墨基材起到保护作用。(The invention provides a graphite high-temperature antioxidant capable of being rapidly dried at normal temperature, which comprises phosphate, a silane coupling agent, silica sol, a surfactant and a solvent. The application method comprises the steps of pretreating the surface of a graphite base material, then carrying out vacuum pressure impregnation on the graphite base material by using a graphite high-temperature antioxidant which is rapidly dried at normal temperature, and standing for 0.5-1 hour in a normal-temperature environment. The graphite high-temperature antioxidant capable of being quickly dried at normal temperature fully wets the graphite blocks and enters the air holes to seal the air holes and form a protective layer, so that the effect of isolating graphite and oxygen is achieved, and the effect of high-temperature oxidation resistance is achieved. The high-temperature resistant coating has good antioxidation and plays a role in protecting the graphite substrate.)

1. The graphite high-temperature antioxidant capable of being rapidly dried at normal temperature is characterized by comprising phosphate, a silane coupling agent, silica sol, a surfactant and a solvent.

2. The ambient fast drying graphite high temperature antioxidant as claimed in claim 1, wherein the phosphate is a mixture of aluminum dihydrogen phosphate, sodium hexametaphosphate and disodium hydrogen phosphate.

3. The graphite high-temperature antioxidant capable of being rapidly dried at normal temperature as claimed in claim 2, wherein the surfactant is one or more of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, alkyl phosphate ester salt and branched fatty alcohol phosphate ester salt.

4. The graphite high-temperature antioxidant capable of being rapidly dried at normal temperature as claimed in claim 3, wherein the solvent is water or glycerol.

5. The graphite high-temperature antioxidant capable of being rapidly dried at normal temperature as claimed in claim 4, which comprises 50-60 w/v% of aluminum dihydrogen phosphate, 4-6 w/v% of sodium hexametaphosphate, 1-3 w/v% of disodium hydrogen phosphate, 5-10 w/v% of silica sol, 2-4 w/v% of silane coupling agent, 1-3 w/v% of surfactant and 14-37 w/v% of solvent.

6. A method for applying the graphite high-temperature antioxidant rapidly dried at normal temperature as claimed in claims 1 to 5, wherein the surface of the graphite substrate is pretreated, then the graphite substrate is impregnated under vacuum pressure by using the graphite high-temperature antioxidant rapidly dried at normal temperature, and then the graphite substrate is placed in a normal temperature environment for 0.5 to 1 hour.

7. The application method of the graphite high-temperature antioxidant capable of being rapidly dried at normal temperature according to claim 6, is characterized in that: the pretreatment is to polish and polish the graphite substrate, and then clean the surface of the graphite substrate for a plurality of times by using absolute ethyl alcohol or acetone.

8. The application method of the graphite high-temperature antioxidant capable of being rapidly dried at normal temperature as claimed in claim 6, wherein the pressure of vacuum pressurization is 0.3-0.5MPa, and the impregnation time is 5-10 min.

Technical Field

The invention relates to a graphite high-temperature antioxidant capable of being rapidly dried at normal temperature and application thereof, belonging to the technical field of graphite oxidation resistance.

Background

Graphite has the characteristics of high density and high strength, is a good high-temperature structural material, and can be used as nuclear graphite, an electrode for electric spark machining, a structural material for rocket technology, aluminum plating and the like. Graphite has wide application in many occasions, and particularly has good high-temperature strength under high-temperature conditions. However, the graphite is oxidized rapidly in the presence of oxygen, which seriously affects the service performance and service life, and therefore, it is necessary to improve the oxidation resistance of graphite. It is common practice to provide a coating on the graphite substrate to improve the oxidation resistance of the graphite.

Disclosure of Invention

The invention provides a graphite high-temperature antioxidant capable of being rapidly dried at normal temperature and an application thereof, which can effectively solve the problems.

The invention is realized by the following steps:

a graphite high-temperature antioxidant capable of being rapidly dried at normal temperature comprises phosphate, a silane coupling agent, silica sol, a surfactant and a solvent.

As a further improvement, the phosphate is a mixture of aluminum dihydrogen phosphate, sodium hexametaphosphate and disodium hydrogen phosphate.

As a further improvement, the surfactant is one or more of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, alkyl phosphate ester salt and branched-chain fatty alcohol phosphate ester salt.

As a further improvement, the solvent is water or glycerol.

As a further improvement, the water-soluble organic silicon dioxide comprises 50-60 w/v% of aluminum dihydrogen phosphate, 4-6 w/v% of sodium hexametaphosphate, 1-3 w/v% of disodium hydrogen phosphate, 5-10 w/v% of silica sol, 2-4 w/v% of silane coupling agent, 1-3 w/v% of surfactant and 14-37 w/v% of solvent.

The application method of the graphite high-temperature antioxidant capable of being rapidly dried at normal temperature comprises the steps of pretreating the surface of a graphite base material, then carrying out vacuum pressure impregnation on the graphite base material by using the graphite high-temperature antioxidant capable of being rapidly dried at normal temperature, and standing for 0.5-1 hour in a normal-temperature environment.

As a further improvement, the pretreatment is to polish the graphite substrate and then clean the surface of the graphite substrate with absolute ethyl alcohol or acetone for several times.

As a further improvement, the pressure of the vacuum pressurization is 0.3-0.5MPa, and the impregnation time is 5-10 min.

The invention has the beneficial effects that:

the graphite high-temperature antioxidant which is quickly dried at normal temperature fully wets the graphite blocks and enters the air holes, closes the air holes and forms a protective layer, thereby achieving the effect of isolating graphite from oxygen and playing the role of high-temperature oxidation resistance. The high-temperature resistant coating has good antioxidation and plays a role in protecting the graphite substrate. The graphite high-temperature antioxidant which is rapidly dried at normal temperature can achieve good protection effect only by standing for 0.5-1 hour in the normal-temperature environment, is convenient to operate, saves cost, and is beneficial to large-scale industrialization.

According to the graphite high-temperature antioxidant capable of being rapidly dried at normal temperature, phosphate, silica sol, a silane coupling agent, a surfactant and the like play a synergistic effect, vacuum pressure impregnation is adopted to directly discharge air in pores of a graphite substrate, impregnation liquid enters the pores to seal the pores, a compact high-temperature-resistant coating is formed on the surface, the coating is strong in binding property with a substrate, is not easy to fall off, and is good in air tightness, and the silica sol, the silane coupling agent and the surfactant further improve the compactness of the coating, increase the adhesiveness of the coating and ensure that the coating does not fall off. Can play a good role in antioxidation in an aerobic environment at 1100 ℃ and protect the graphite substrate.

The application method of the graphite high-temperature antioxidant which is rapidly dried at normal temperature does not need complex instruments and equipment, is easy to operate and good in repeatability, and is convenient for industrial production and application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is an electron micrograph of a high temperature resistant coating on a graphite substrate provided in example 1 of the present invention.

FIG. 2 is an external view of a refractory coating on a graphite substrate provided in example 1 of the present invention.

FIG. 3 is a graph comparing the wear rates of the high temperature resistant and oxidation resistant coating on the graphite substrate provided in example 1 and comparative examples 1, 2, 3 and 4 of the present invention under different temperature conditions.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.