阅读说明：本技术 碳化硅陶瓷膜疏水疏油处理方法 (Hydrophobic and oleophobic treatment method for silicon carbide ceramic membrane ) 是由 唐谊平 陈强 张健力 金杨福 徐登波 郑忠斌 沈华 于 2021-08-10 设计创作，主要内容包括：本发明提出了一种碳化硅陶瓷膜疏水疏油处理方法,本发明解决上述问题所采用的技术方案是：疏水疏油的碳化硅陶瓷膜的处理方法包括有以下步骤：步骤一：将成型的碳化硅陶瓷膜进行表面处理,步骤二：将表面处理后的碳化硅陶瓷膜涂覆硅烷偶联剂,步骤三：将涂覆后的碳化硅陶瓷膜在保护氛围中加热,并在自然冷却后固化硅烷偶联剂,步骤四：将步骤三冷却后的碳化硅陶瓷膜表面涂覆氟表面活性剂,并在通风处进行干燥。本处理方法提高了碳化硅的疏水性,在含油废水的处理过程中可以减少液体中杂质进入到空隙中,提高碳化硅陶瓷膜的使用寿命。(The invention provides a hydrophobic and oleophobic treatment method for a silicon carbide ceramic membrane, and the technical scheme adopted for solving the problems is as follows: the processing method of the hydrophobic and oleophobic silicon carbide ceramic membrane comprises the following steps: the method comprises the following steps: and (2) carrying out surface treatment on the formed silicon carbide ceramic membrane, wherein the step two is as follows: coating the silicon carbide ceramic membrane subjected to surface treatment with a silane coupling agent, and performing the third step: heating the coated silicon carbide ceramic membrane in a protective atmosphere, naturally cooling, and then curing a silane coupling agent, wherein the step four is as follows: and (4) coating a fluorine surfactant on the surface of the silicon carbide ceramic membrane cooled in the step three, and drying the silicon carbide ceramic membrane in a ventilated place. The treatment method improves the hydrophobicity of the silicon carbide, can reduce impurities in the liquid from entering gaps in the treatment process of the oily wastewater, and prolongs the service life of the silicon carbide ceramic membrane.)

1. A hydrophobic and oleophobic treatment method for a silicon carbide ceramic membrane is characterized by comprising the following steps: the processing method of the hydrophobic and oleophobic silicon carbide ceramic membrane comprises the following steps:

the method comprises the following steps: the surface treatment is carried out on the formed silicon carbide ceramic membrane,

step two: coating silane coupling agent on the surface treated silicon carbide ceramic membrane,

step three: heating the coated silicon carbide ceramic membrane in a protective atmosphere, naturally cooling the silicon carbide ceramic membrane, curing a silane coupling agent,

step four: and (4) coating a fluorine surfactant on the surface of the silicon carbide ceramic membrane cooled in the step three, and drying the silicon carbide ceramic membrane in a ventilated place.

2. The hydrophobic and oleophobic treatment method for silicon carbide ceramic membrane according to claim 1, characterized in that: and the surface treatment in the step one is to grind the surface of the silicon carbide ceramic membrane to be flat without bulges and burrs through a grinding device, and then to cook the ground silicon carbide ceramic membrane in an alkaline solution.

3. The hydrophobic and oleophobic treatment method for silicon carbide ceramic membrane according to claim 2, characterized in that: the alkaline solution is one or more of sodium hydroxide, potassium hydroxide and calcium hydroxide, and the pH value of the solution is more than or equal to 10.

4. The hydrophobic and oleophobic treatment method for silicon carbide ceramic membrane according to claim 1, characterized in that: and secondly, dissolving the silane coupling agent in the solvent, and immersing the silicon carbide ceramic membrane in the solution of the silane coupling agent, wherein the silane coupling agent covers the surface of the silicon carbide ceramic membrane.

5. The hydrophobic and oleophobic treatment method for silicon carbide ceramic membrane according to claim 1, characterized in that: and step two, heating gas of the silane coupling agent is vaporized and sprayed on the surface of the ceramic silicon carbide, and the surface covering layer is formed after cooling.

6. The hydrophobic and oleophobic treatment method for silicon carbide ceramic membrane according to claim 1, characterized in that: and the heating device in the third step is a tunnel type heating furnace, the silicon carbide ceramic membrane moves to a high-temperature area of the heating furnace on the tunnel vehicle, and after the target temperature is reached, the temperature is reduced and cooled in a cooling area through the tunnel vehicle.

7. The hydrophobic and oleophobic treatment method for silicon carbide ceramic membrane according to claim 1, characterized in that: and in the third step, the protective atmosphere is nitrogen, and the concentration of the nitrogen is more than 95%.

8. The hydrophobic and oleophobic treatment method for silicon carbide ceramic membrane according to claim 1, characterized in that: the fluorinated surfactant in the fourth step is perfluorocarboxylate or perfluoroalkylsulfonate.

Technical Field

The invention relates to an improvement mode of a filter material in an oil-water separation device, in particular to a hydrophobic and oleophobic treatment method of a silicon carbide ceramic membrane.

Background

The metal working fluid is a functional fluid applied to a metal working process, waste materials of the working fluid generated after the metal working fluid is used are waste liquids, components in the waste liquids are complex, the metal working fluid is more in types, and the metal working fluid mainly plays roles in lubricating and cooling and has functions of rust prevention and cleaning and the like. General metal working fluid includes cutting fluid, cutting oil, punching oil, quenching agent, high temperature oil, extreme pressure cutting fluid, grinding fluid, antirust oil, cleaner etc. all kinds of processing fluids can be concentrated and collected usually, and the impurity composition in the waste liquid is complicated, mainly contains metal particle and other impurity granule to can dissolve some inorganic salt impurity, and in order to improve machining efficiency, have a large amount of oily material in the waste liquid, formed the waste liquid of the multiple mixture of water, oil, solid, the degree of difficulty of handling is big, and recoverable composition is few, the difficult kind of handling of liquid waste.

The SiC (silicon carbide) ceramic membrane is a filtering material with good filtering performance, the conventional ceramic membrane material is a material with high hydrophilicity and lipophobicity, oily liquid is not easy to pass through, but water-based liquid can drive particles in water to quickly contact with the surface of the ceramic membrane due to hydrophilicity, the filtering structure of the ceramic membrane is blocked too quickly, the filtering efficiency is reduced, the using performance of the filtering material is influenced, and the ceramic membrane is expected to be improved and can be used for treating metal processing waste liquid.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a silicon carbide ceramic membrane hydrophobic and oleophobic treatment method.

The technical scheme adopted by the invention for solving the problems is as follows:

the processing method of the hydrophobic and oleophobic silicon carbide ceramic membrane comprises the following steps:

the method comprises the following steps: the surface treatment is carried out on the formed silicon carbide ceramic membrane,

step two: coating silane coupling agent on the surface treated silicon carbide ceramic membrane,

step three: heating the coated silicon carbide ceramic membrane in a protective atmosphere, naturally cooling the silicon carbide ceramic membrane, curing a silane coupling agent,

step four: and (4) coating a fluorine surfactant on the surface of the silicon carbide ceramic membrane cooled in the step three, and drying the silicon carbide ceramic membrane in a ventilated place.

According to the treatment method, the surface of the silicon carbide ceramic membrane is coated with the silane coupling agent and is simultaneously covered with the fluorine surfactant, a complete hydrophobic and oleophobic structure is formed on the surface of the silicon carbide ceramic membrane, so that the hydrophobicity of silicon carbide is improved, impurities in liquid can be reduced from entering gaps in the treatment process of oily wastewater, the filtration effect of the wastewater can be effectively improved by improving the pressure, the water passing rate is improved, the service life of the silicon carbide ceramic membrane can be prolonged, and the overall service life of the filtration equipment is prolonged.

Further, the surface treatment in the first step is to grind the surface of the silicon carbide ceramic membrane to be flat without protrusions and burrs through a grinding device, and then to cook the ground silicon carbide ceramic membrane in an alkaline solution. The polished surface is smooth, the adhesiveness is improved, gaps after cooking are cleaned, and the filtering effect is improved.

Further, the alkaline solution is one or more of sodium hydroxide, potassium hydroxide and calcium hydroxide, and the pH value of the solution is more than or equal to 10. The alkaline solution is alkaline salt solution, so that the immersion effect is good, and the filtering effect of the silicon carbide ceramic can be improved.

Further, in the second step, the silane coupling agent is dissolved in the solvent, and then the silicon carbide ceramic membrane is immersed in the solution of the silane coupling agent, so that the surface of the silicon carbide ceramic membrane is covered with the silane coupling agent. The solution of the silane coupling agent has a large contact surface and is suitable for forming a coating layer having a high density.

And further, in the second step, the silane coupling agent heating gas is vaporized and sprayed on the surface of the ceramic silicon carbide, and the surface coating is formed after cooling. The vapor forming spray coating has high efficiency, and can form a thin covering layer.

Further, the heating device in the third step is a tunnel type heating furnace, the silicon carbide ceramic membrane moves to a high-temperature area of the heating furnace on a tunnel vehicle, and after the target temperature is reached, the temperature is reduced and cooled in a cooling area through the tunnel vehicle. The heating process of the silicon carbide ceramic membrane is stable, and the silicon carbide ceramic membrane can be efficiently treated and produced.

Further, the protective atmosphere in the third step is nitrogen, and the concentration of the nitrogen is more than 95%.

Further, the fluorinated surfactant in the step four is perfluorocarboxylate or perfluoroalkylsulfonate.

Compared with the prior art, the invention has the following advantages and effects: according to the treatment method, the surface of the silicon carbide ceramic membrane is coated with the silane coupling agent and is simultaneously covered with the fluorine surfactant, a complete hydrophobic and oleophobic structure is formed on the surface of the silicon carbide ceramic membrane, so that the hydrophobicity of silicon carbide is improved, impurities in liquid can be reduced from entering gaps in the treatment process of oily wastewater, the filtration effect of the wastewater can be effectively improved by improving the pressure, the water passing rate is improved, the service life of the silicon carbide ceramic membrane can be prolonged, and the overall service life of the filtration equipment is prolonged.

Detailed Description

The present invention is further illustrated by the following examples, which are illustrative of the present invention and are not to be construed as being limited thereto.

The first embodiment is as follows: a hydrophobic and oleophobic treatment method for a silicon carbide ceramic membrane comprises the following steps:

the method comprises the following steps: the surface treatment is carried out on the formed silicon carbide ceramic membrane,

step two: coating silane coupling agent on the surface treated silicon carbide ceramic membrane,

step three: heating the coated silicon carbide ceramic membrane in a protective atmosphere, naturally cooling the silicon carbide ceramic membrane, curing a silane coupling agent,

step four: and (4) coating a fluorine surfactant on the surface of the silicon carbide ceramic membrane cooled in the step three, and drying the silicon carbide ceramic membrane in a ventilated place.

And the surface treatment in the step one is to grind the surface of the silicon carbide ceramic membrane to be flat without bulges and burrs through a grinding device, and then steam and boil the ground silicon carbide ceramic membrane in an alkaline solution for 5 hours.

The alkaline solution is one or more of sodium hydroxide, potassium hydroxide and calcium hydroxide, and the pH of the solution is = 11.

And secondly, dissolving the silane coupling agent in the solvent, and immersing the silicon carbide ceramic membrane in the solution of the silane coupling agent, wherein the silane coupling agent covers the surface of the silicon carbide ceramic membrane.

And step two, heating gas of the silane coupling agent is vaporized and sprayed on the surface of the ceramic silicon carbide, and the surface covering layer is formed after cooling.

And the heating device in the third step is a tunnel type heating furnace, the silicon carbide ceramic membrane moves to a high-temperature area of the heating furnace on the tunnel vehicle, the integral temperature of the silicon carbide ceramic membrane reaches 180 ℃, and the temperature is reduced and cooled in a cooling area through the tunnel vehicle.

And in the third step, the protective atmosphere is nitrogen, and the concentration of the nitrogen is 95%.

The fluorinated surfactant in the fourth step is perfluorocarboxylate or perfluoroalkylsulfonate.

Example two: a hydrophobic and oleophobic treatment method for a silicon carbide ceramic membrane comprises the following steps:

the method comprises the following steps: the surface treatment is carried out on the formed silicon carbide ceramic membrane,

step two: coating silane coupling agent on the surface treated silicon carbide ceramic membrane,

step three: heating the coated silicon carbide ceramic membrane in a protective atmosphere, naturally cooling the silicon carbide ceramic membrane, curing a silane coupling agent,

step four: and (4) coating a fluorine surfactant on the surface of the silicon carbide ceramic membrane cooled in the step three, and drying the silicon carbide ceramic membrane in a ventilated place.

And the surface treatment in the step one is to grind the surface of the silicon carbide ceramic membrane to be flat without bulges and burrs through a grinding device, and then steam and boil the ground silicon carbide ceramic membrane in an alkaline solution for 8 hours.

The alkaline solution is one or more of sodium hydroxide, potassium hydroxide and calcium hydroxide, and the pH of the solution is = 13.

And secondly, dissolving the silane coupling agent in the solvent, and immersing the silicon carbide ceramic membrane in the solution of the silane coupling agent, wherein the silane coupling agent covers the surface of the silicon carbide ceramic membrane.

And step two, heating gas of the silane coupling agent is vaporized and sprayed on the surface of the ceramic silicon carbide, and the surface covering layer is formed after cooling.

And the heating device in the third step is a tunnel type heating furnace, the silicon carbide ceramic membrane moves to a high-temperature area of the heating furnace on the tunnel vehicle, the overall temperature of the silicon carbide ceramic membrane reaches 240 ℃, and the temperature is reduced and cooled in a cooling area through the tunnel vehicle.

And in the third step, the protective atmosphere is nitrogen, and the concentration of the nitrogen is 98%.

The fluorinated surfactant in the fourth step is perfluorocarboxylate or perfluoroalkylsulfonate.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore intended that the present embodiments be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.