KR100476648B1 - Carbon plate for fuel cell - Google Patents

Abstract

The present invention relates to an acrylic impregnation liquid of a carbon plate for a fuel cell, which is a main component of a fuel cell, and an impregnation method using the same.

The present invention,

93.3-95% by weight of 2-hydroxypropyl methacrylate,

0.3 to 1.7 wt% of trimethylolpropane Triethoxy Tridcrylate,

2-2.5% by weight of polyxyethylene (20) Sorbitan Monooleate,

0.1-2 wt% of 2,6-Di-tert-Butyl-4-methlyphenol,

2,5-beads (5'-tert-butyl-2'-benzozazole) thiophene (2,5-Bis (5'-tert-butyl-2'-benzoxazolyl) thiophene) 0.01-0.5 wt% The acrylic impregnation solution, the step of drying the plate material in the oven from 170 ℃ to ± 30 ℃ (step 1), and vacuuming the dried plate material in the impregnation tank at a pressure of less than 25 mbar for about 20 minutes, (2 Step) The plate material is filled with acrylic impregnation solution 20mm or more and left to stand for a certain time, (Step 3) vacuuming for more than 20 minutes at a pressure of less than 25 mbar while submerged in the acrylic impregnation solution (step 4) End of vacuum time The impregnation tank is impregnated by applying pressure for 60 minutes under the pressure of 6 bar or more, (step 5) washing the impregnated plate material in the washing tank, and (step 6) washing the plate material at 180 ° C ± (15) for at least 5 hours. The carbon plate is impregnated with a process consisting of curing in an oven (step 7).

Description

Acrylic impregnation solution of carbon plate for fuel cell and impregnation method using same {Carbon plate for fuel cell}

The present invention relates to an acrylic impregnation solution of a carbon plate of a fuel cell and an impregnation method using the same.

A fuel cell is a device that directly converts chemical energy (combustion energy) into electrical energy, and its structure includes a support including a catalyst layer, an anode (oxygen electrode), a cathode (hydrogen electrode), a polymer electrolyte, and a fuel passage. It consists of the carbon plate shown in FIG. 1 which performs the whole role.

In such a fuel cell, hydrogen supplied to a cathode (hydrogen electrode) through a carbon plate becomes a hydrogen ion by a catalyst, and hydrogen ions and oxygen ions react at a positive electrode (oxygen electrode) to generate water vapor. Electric current flows from the anode (oxygen) to the cathode (hydrogen).

Reaction equation and general reaction which take place at each electrode are as follows.

_{Anode: H 2 (g) →} 2H + + 2e -

_{Cathode: 1 / 2O 2 (g} ) + 2H + + 2e - → H 2 O

Total: H ₂ + _1/2 0 ₂ = H ₂ O Eo = 1.23 V

Fuel cells that generate electricity by this chemical reaction have a function of a small generator, not a storage battery concept, because electric energy is continuously obtained while fuel is supplied. In order to maximize the efficiency, the performance of the carbon plate contributes to the sun, especially to satisfy the condition of airtightness.

Conventionally, when the carbon plate is manufactured, the carbon plate is manufactured by impregnating a thermosetting resin, that is, a phenol resin (an example of a polymer resin) after the mechanical processing process as shown in FIG. 2.

However, the carbon plate manufactured in this way is not only easy to impregnate the thermosetting resin, that is, the phenol resin system, but also has a change in dimensions (external change) during the impregnation process, and after impregnation, it is impossible to remove the impregnation liquid on the product. do. This impedes the maintenance of airtightness, which requires high precision work, resulting in long manufacturing time and mass production of defective products. In addition, the defective products generated by condensed milk are impossible to recycle, so all of them are disposed of, resulting in a large loss of material costs, which causes a decrease in productivity and a price increase of products.

Of course, in order to lower the defective rate of the product, there is a method of impregnating the plate material and then mechanically processing, but in the state of the thermosetting resin impregnation, the hardness of the product is high and the tension is insufficient, so the mechanical processing is not only difficult but also mechanically consumed. There were many that could not be adopted.

The present invention was devised to solve the conventional problems, the object of which can be carried out the process of impregnating the resin in the plate material irrespective of the line before and after the mechanical processing as well as without changing the characteristics appearing during the impregnation To provide an acrylic impregnation solution of a carbon plate for a fuel cell and an impregnation method using the same, the impregnation process may be repeated until the carbon plate having poor airtightness in the finished product has a complete airtightness.

In addition, another object of the present invention is to reduce the time during the resin impregnation process on the carbon plate to improve the productivity and to reduce the wear rate of the tool to a minimum even when processing the impregnated carbon plate.

The present invention for achieving the above object

93.3-95% by weight of 2-hydroxypropyl methacrylate,

0.3 to 1.7 wt% of trimethylolpropane Triethoxy Tridcrylate,

2-2.5% by weight of polyxyethylene (20) Sorbitan Monooleate,

0.1-2% by weight of 2,6 di-tert-butyl-4-methylphenol (2.6-Di-tert-Butyl-4-methlyphenol),

2,5-bead (5'-tert-butyl-2'-benzozazole) thiophene (acryl) consisting of 0.01-0.5% by weight of 2.5-Bis (5'-tert-butyl-2'-benzoxazolyl) thiophene) An impregnation solution is to be provided.

In addition, the method of impregnating the carbon plate of the present invention, the step of removing moisture while drying the plate material in the oven, the vacuum in the impregnation tank and the vacuum soaked in the acrylic impregnation liquid and the acrylic impregnation liquid,

Impregnating by applying pressure for 60 minutes under the pressure of 6 bar or more in the impregnation tank,

Washing the impregnated plate material in a washing bath,

It consists of seven steps that cure the washed plate material at 180 ° C ± 15 ° C oven for at least 5 hours.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a carbon plate manufacturing process according to the present invention.

The acrylic resin (= acrylic) impregnation liquid impregnated with a carbon plate,

93.3-95% by weight of 2-hydroxypropyl methacrylate,

0.3 to 1.7 wt% of trimethylolpropane Triethoxy Tridcrylate,

2-2.5% by weight of polyxyethylene (20) Sorbitan Monooleate,

0.1-2 wt% of 2,6-Di-tert-Butyl-4-methlyphenol,

2,5-beads (5'-tert-butyl-2'-benzozazole) thiophene (2,5-Bis (5'-tert-butyl-2'-benzoxazolyl) thiophene) 0.01-0.5 wt% It is composed.

The carbon plate is impregnated with this impregnation liquid, that is, acrylic resin (= acrylic) impregnation liquid. In the impregnation process, first, the plate material is dried in an oven at ± 30 ° C. at 170 ° C. (step 1). In this drying process, the moisture in the plate material is removed. If the temperature is too low, the moisture is easily removed. If it is too high, the product will burn if it is too high.

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The plate material dried in the oven is transferred to the impregnation tank and vacuumed for 20 minutes at a pressure of less than 25 mbar (step 2). At this stage, the water remaining in the plate material is removed in a vacuum.

Then, the plate material is filled in an acrylic (resin) impregnation liquid (a kind of polymer resin) having the above-described ingredient fertilizer and left to stand for a predetermined time. This process also removes moisture remaining in the plate material.

After submerged in the acrylic impregnation solution, the residual water is removed again by a vacuum step (step 4) at a pressure of less than 25 mbar for 20 minutes.

In this way, after removing water as much as possible through several steps (steps 1 to 4), the impregnating tank is impregnated by applying pressure for 60 minutes under the pressure of 6 bar or more (step 5).

Subsequently, the resin in the impregnation tank is drained in 3 to 7 minutes while flowing backwards. At this time, if the pressure condition at the time of drainage is low, the impregnated state is damaged, so maintain the pressure of 2 ± 0.5bar. In addition, when the drainage time is delayed, the impregnated acrylic resin may be separated from the carbon plate, so the drainage time of about 5 minutes is most suitable.

When the impregnation is completed, transported to the washing tank through the carrier to be submerged twice in the water and washed firstly, and then washed in a manner that the second washing tank is soaked four times so that the residue on the outside of the carbon plate Remove resin and prevent dimensional change.

The washed carbon plate is then hardened by standing in an oven for 5 hours in a 180 ° C ± 15 ° C oven. (Step 7) If the temperature is higher, the acrylic resin (acrylic) impregnation liquid flows out again. It is important to maintain the temperature.

If necessary, the curing step may be performed by immersion in the hot water at 90 ° C without curing in an oven for curing.

When the curing is completed, the gas plate is inspected for gas tightness. If the result is abnormal, the same process is repeated again to ensure perfect airtightness.

The carbon plate of the present invention prepared as described above can be applied to fuel cells of various products such as automobile fuel cells, household fuel cells, mobile phones, PDAs, NOTE PCs, and the like.

Impregnating the carbon plate by using the acrylic resin impregnation solution of the present invention described above, the impregnation process can be performed before and after mechanical processing without changing the external properties of the material, and the carbon plate that has a bad airtightness in the finished product There is an effect that the impregnation process can be repeated until complete airtightness is obtained.

In addition, in the impregnation process, it is possible to reduce the productivity by 70 hours compared to the conventional impregnation method, and to improve productivity. Also, when the impregnated carbon plate is processed, the wear rate is minimized because the mechanical wear rate is almost the same as that of the pre-impregnated carbon plate. Economic effects such as the effect that can be great.

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1 is a structural diagram of a carbon plate that is a component of a fuel cell.

Figure 2 is a carbon plate manufacturing process according to the prior art.

Figure 3 is a carbon plate manufacturing process according to the present invention.

Claims (5)

93.3-95% by weight of 2-hydroxypropyl methacrylate, 0.3 to 1.7 wt% of trimethylolpropane Triethoxy Tridcrylate, 2-2.5% by weight of polyxyethylene (20) Sorbitan Monooleate, 0.1-2 wt% of 2,6-Di-tert-Butyl-4-methlyphenol, 2,5-beads (5'-tert-butyl-2'-benzozazole) thiophene (2,5-Bis (5'-tert-butyl-2'-benzoxazolyl) thiophene) 0.01-0.5 wt% Acrylic impregnation solution of the carbon plate for fuel cells. Drying the plate material at 170 ° C. to ± 30 ° C. in an oven (step 1) Vacuuming the dried plate material in the impregnation tank at a pressure of less than 25 mbar for about 20 minutes (step 2) Filling the plate material in the acrylic impregnation liquid of claim 1 or more 20mm and left for a certain time, (step 3) And vacuuming for at least 20 minutes at a pressure of less than 25 mbar while submerged in the acrylic impregnation solution of claim 1, (step 4). At the end of the vacuum time, the impregnation tank is impregnated by applying pressure for 60 minutes under the pressure of 6 bar or more, and (step 5). Washing the impregnated plate material in a washing tank (step 6) Impregnation method using an acrylic impregnation liquid of the carbon plate for a fuel cell, characterized in that consisting of a step (7 steps) of curing the washed plate material at 180 ℃ ± (15 ℃) oven for more than 5 hours. The acrylic impregnation solution of the carbon plate for fuel cell according to claim 2, wherein after the impregnation of the carbon plate material with resin (step 5), the impregnation solution is drained for 5 minutes while maintaining a pressure of 2 ± 0.5 bar. Impregnation method using. 3. The fuel cell according to claim 2, wherein after the step (7) of curing the plate material, the gas tightness check step is further configured to repeat each step until the desired degree of airtightness occurs when a defect occurs. Impregnation method using an acrylic impregnation solution of the carbon plate. The impregnation method according to claim 2, wherein the curing of the impregnated carbon plate is performed by immersing it in hot water at 90 ° C. to cure the carbon plate.