JP3229116B2 - Cartridge filter and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cartridge filter, and more particularly to a cartridge filter having a compound for adsorbing particles attached thereto.

[0002]

2. Description of the Related Art Cartridge filters include filter media such as knitted fabric, nonwoven fabric, paper, and yarn, which are wound and laminated on a porous core to form a depth-type cartridge filter, or a pleated filter. There is a pleated cartridge filter wound around a conductive core. Filter media used in these cartridge filters can prevent the passage of particles such as dust by reducing the diameter of the aperture, thereby increasing the filtration efficiency.However, the size of the particles that can be captured is limited, and When the hole diameter is reduced, there is a problem that clogging is likely to occur.

In order to solve this problem, the present inventors have tried to attach a quaternary ammonium salt such as stearyltrimethylammonium chloride to the surface of a filter medium. Since the quaternary ammonium salt can adsorb particles by the ionic adsorption of quaternized nitrogen, a high collection efficiency can be achieved even if the pore size of the filter medium is large. However, since the quaternary ammonium salt has no strong bond with the surface of the filter medium, it is detached from the surface of the filter medium during use, so that the adsorption effect cannot be maintained. In addition, when the treated liquid is used, there is a problem in that the desorbed quaternary ammonium salt enters the treated liquid.

[0004] Similarly, it has been studied to attach a quaternary salt of a vinylpyridine-styrene copolymer having an ionic adsorption force to the surface of a filter medium. It cannot be completely insoluble, but on the other hand, if the proportion of the styrene portion is increased, the adsorbing power of the particles is reduced, so that there is a problem that the adjustment is difficult.

In order to solve these problems, the present inventor proposed in Japanese Patent Application No. 5-25919 a filter medium which is photo-crosslinked by attaching photocrosslinkable polyvinyl alcohol having a photosensitive group such as a styrylpyridinium group. did. This filter medium can efficiently adsorb particles by the action of the hydroxyl group and pyridinium group of the photo-crosslinkable polyvinyl alcohol, and since the photo-crosslinkable polyvinyl alcohol is firmly attached to the filter medium surface by the photo-crosslinking, it is dissolved in water. It is an excellent filter medium that does not have to worry about dropping or falling into water.

However, even in the case of this filter medium, there is a problem that the process of manufacturing a cartridge filter is very complicated. For example, in the case of a cartridge filter, in order to have a density gradient, a combination of filter media having different pore sizes is wound and laminated. When such a combination of different types of filter media is used, the photocrosslinkable polyvinyl alcohol is used. Has to be performed for each of the different filter media, which requires a lot of time. To deal with this, we considered simultaneous processing with different filter media laminated.However, when the filter media were laminated, the light did not reach the inside sufficiently, so there was a part where the photo-crosslinking did not proceed sufficiently. In some cases, the crosslinked resin was dissolved in water. Further, at the time of assembling a cartridge filter such as a wound lamination, there is a risk that the photo-crosslinkable polyvinyl alcohol may fall off from the processed filter material due to the contact between the filter media or other media.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the prior art, and has a high particle collection efficiency and the elution of a compound capable of adsorbing particles. It is an object of the present invention to provide a cartridge filter that does not fall off and that can be easily manufactured.

[0008]

Means for Solving the Problems To solve the above-mentioned problems, the invention according to claim 1 is directed to a method in which a filter medium 2 having an opening diameter of 3 to 70 μm is wound and laminated around a porous core 1. In a cartridge filter comprising: a porous core 1 and a filter medium 2,

Wherein R ¹ is an alkyl group having 1 to 22 carbon atoms,
R ² is an alkyl group having 1 to 4 carbon atoms, X is a halogen atom,
a represents 0 or 1) is a dehydration-condensation compound formed by subjecting an organosilane compound represented by
A cartridge filter for collecting particles, wherein 0.1 to 0.2% by weight is attached to the weight of the cartridge filter. "

Further, the invention according to claim 2 provides a cartridge filter formed by winding and laminating a filter medium 2 having an opening diameter of 3 to 70 μm around a porous core 1 by the following formula:

Wherein R ¹ is an alkyl group having 1 to 22 carbon atoms,
R ² is an alkyl group having 1 to 4 carbon atoms, X is a halogen atom,
After a is imparted with 0 or organosilane compounds represented by representing the 1), 0.1 to the adhesion amount of the dehydrating condensation compound formed by dry relative to the weight of the cartridge filter
And a method of manufacturing a cartridge filter for collecting particles, characterized in that the content is 0.2% by weight.

That is, since the dehydration-condensation compound formed by the dehydration-condensation reaction of the organosilane compound shown in Chemical formula 1 is attached to the porous core 1 and the filter medium 2 of the cartridge filter of the present invention, the particles are strongly adsorbed. A possible quaternized nitrogen is present on the surface of the porous core 1 and the filter medium 2 having a large surface area, and in addition to the physical collection of particles by the opening of the filter medium, the adsorption of ionic particles is used. it can. For this reason, the cartridge filter of the present invention can collect fine particles without reducing the opening diameter of the filter medium, is hardly clogged, has a long life, and has excellent collection efficiency. In addition, since the above dehydration-condensation compound is insoluble in water and chemically chemically bonded to the surface of the porous core and the filter medium, there is no fear of elution or peeling during use. Moreover, the cartridge filter of the present invention can be obtained by simply immersing the cartridge filter in which the filter medium 2 is wound and laminated on the porous core 1 in the solution of the organosilane compound shown in Chemical formula 3, and then drying the filter. Can be done.

The present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an example of the cartridge filter of the present invention.

In the present invention, an organosilane compound represented by Chemical Formula 3 is used. In the presence of water, the organosilane compound forms a silanol group by hydrolysis of an alkoxy group and a methanol removal reaction, and a siloxane bond by a dehydration condensation reaction between the organosilane compounds to form a dehydration condensation compound. In addition, the dehydration-condensation compound is a dehydration-condensation reaction between the organosilane compound and the surface of the porous core and the surface of the filter medium, and the ionic bond of the organosilane compound by cations of quaternized nitrogen. Strongly binds to the filter media surface. As such an organosilane compound, for example, 3- (trimethoxysilyl) propyloctadecyldimethylammonium chloride and 3- (trimethoxysilyl) propylhexadecyldimethylammonium chloride are preferably used. The above-mentioned organosilane compound may be used as a complex with monoethylene fatty acid having 10 to 18 carbon atoms.

The organosilane compound represented by the above formula 3 is
For example, an alcohol solution such as methanol, ethanol, or isopropanol, a mixed solution of an alcohol and an organic solvent compatible with an alcohol, or a mixed solution of water and an alcohol was formed, and a filter medium was wound around the porous core and laminated. Applied to the cartridge filter. The solution concentration of this organosilane compound is preferably 0.05 to 5% by weight, and if it is less than 0.05% by weight, a sufficient fine particle adsorption capacity may not be obtained. It is difficult to uniformly adhere to the surface. The application of the solution to the cartridge filter is performed, for example, by impregnation, spraying, printing, coating, coating, or the like. It is particularly preferable that the solution is impregnated in the cartridge filter by immersing the cartridge filter in the solution.

The cartridge filter to which the solution of the organosilane compound is applied may be a finished product in which a filter medium 2 is wound around a porous core 1 and laminated, and upper and lower caps 3 are attached. It may be in the process of being manufactured before attaching a cap or the like. . In the case of a finished product, if the solution is applied by, for example, impregnation or the like, the organosilane is applied to almost all portions of the liquid to be treated during actual liquid filtration, including the inner surface of the cap 3 and the like. Since the dehydration-condensation compound of the compound adheres, the ability to adsorb fine particles is further improved. Further, by applying a solution of the organosilane compound to a commercially available cartridge filter and drying the solution, the ability to collect fine particles can be easily improved. This cartridge filter has a net 4 or a large hole diameter (coarse) together with the filter medium 2 as a reinforcing material or a carrier material.
Spunbonded nonwoven fabric or the like may be wound and laminated. In this case, the dehydration-condensation compound of the organosilane compound adheres to the net 4 and the like, which contributes to adsorption of the fine particles.

The organosilane compound applied to the cartridge filter forms a silanol group by hydrolysis of an alkoxy group and a methanol removal reaction in the presence of water. Therefore, in order to more uniformly adhere the dehydration-condensation compound of the organosilane compound to the cartridge filter, it is desirable that the solution of the organosilane compound contains water.

Thereafter, the solvent is removed by drying or the like, whereby the silanol groups of the organosilane compound are siloxane-bonded by a dehydration condensation reaction to form a dehydration condensation compound. 1 and to the surface of the filter medium 2. The binding of the dehydration-condensation compound to the surface of the porous core and the surface of the filter medium may be a dehydration-condensation reaction between the silanol group and the surface of the porous core and the filter medium, an ionic bond due to the cationic nature of quaternized nitrogen, or both. It is thought to be due to.

The porous core 1 and the filter medium 2 of the cartridge filter of the present invention have a dehydration-condensation compound formed by subjecting the organosilane compound to a dehydration-condensation reaction. For this reason, quaternized nitrogen having the ability to ionically adsorb fine particles is widely distributed on the surface of the porous core and the filter medium having a large surface area, and the chance of contact with the particles to be collected is increased. Can be efficiently adsorbed. Also,
As described above, since the dehydration-condensation compound composed of the organosilane compound is insoluble in water and firmly adheres to the surface of the porous core and the filter medium, the compound may be dissolved in the treatment liquid or fall off the porous core and the filter medium. There is no need to worry about polluting the environment and safety is high.

The amount of the dehydration-condensation compound formed by dehydration-condensation of the organosilane compound shown in Chemical Formula 3 is 0.05 to 5 parts by weight of the cartridge filter.
If the amount is less than this, the adsorbing power of the fine particles cannot be sufficiently obtained, and the trapping ability is reduced. If the amount is more than this, clogging of the filter medium tends to occur. A particularly preferable range of the adhesion amount is 0.1 to 1% by weight based on the weight of the cartridge filter.

The porous core 1 used in the cartridge filter of the present invention is not particularly limited, and any conventionally known porous core can be used. For example, a porous core made of stainless steel, polyamide resin, or polypropylene resin is preferably used. .

The filter medium 2 used in the cartridge filter of the present invention is not particularly limited, and conventionally known ones can be used. For example, woven fabric, knitted fabric, nonwoven fabric, paper, thread, mesh, etc., alone or in combination are used. it can. In particular, a preferable filter medium 2 is a relatively dense material such as a melt blown nonwoven fabric,
By attaching a dehydration / condensation compound formed by subjecting the organosilane compound to a dehydration / condensation reaction, it becomes possible to collect fine particles which were conventionally difficult to collect without sacrificing water flow resistance or filtration life. However, a coarse filter medium can be used depending on the application.

[0021]

[0022]

【Example】

Example 1 Filter media numbers 1 to 1 shown in Table 1 below by melt blow method.
Eight types of polypropylene-made melt-blown nonwoven fabrics having a basis weight of 80 g / m ^{2 and} different average pore sizes of 8 were produced. These filter media were wound and laminated on a porous core in ascending order of the filter media number to produce a cartridge filter having an inner diameter of 3 cm, an outer diameter of 6.4 cm, and a length of 25 cm. On the other hand, a 50% methanol solution of 3- (trimethoxysilyl) propyloctadecyldimethylammonium chloride was added to water, and further diluted with ethanol to obtain a 0.2% by weight water / alcohol mixed solution. The mixed solution is impregnated into the cartridge filter to adhere the solid content to 0.2% by weight based on the weight of the cartridge filter, and then dried to obtain 3- (trimethoxysilyl) A cartridge filter to which a dehydration-condensation compound formed by the dehydration-condensation reaction of propyloctadecyldimethylammonium chloride was obtained was obtained.

[0023]

[Table 1]

Comparative Example 1 Filter media 1 to 8 shown in Table 1 were wound and laminated on a porous core in ascending order of the filter media number, and the inner diameter was 3 cm and the outer diameter was 6.4 c.
m, a cartridge filter having a length of 25 cm was prepared.

Example 2 Eight types of polypropylene melt-blown nonwoven fabrics having a basis weight of 80 g / m ^{2 and having} different average pore diameters of filter media Nos. 1 to 8 shown in Table 2 shown below, which were produced by a melt blow method, were sequentially arranged in ascending order of the filter media No. 3- (trimethoxysilyl) propyl octadecyl was prepared in the same manner as in Example 1 except that a cartridge filter having an inner diameter of 3 cm, an outer diameter of 6.4 cm, and a length of 25 cm produced by winding and laminating the porous core was used. A cartridge filter to which a dehydration-condensation compound of dimethylammonium chloride was attached was obtained.

[0026]

[Table 2]

Comparative Example 2 Filter media 1 to 8 shown in Table 2 were wound and laminated on a porous core in ascending order of the filter media number, and the inner diameter was 3 cm and the outer diameter was 6.4c.
m, a cartridge filter having a length of 25 cm was prepared.

Example 3 Eight types of polypropylene melt-blown nonwoven fabrics having a basis weight of 80 g / m ^{2 and having} different average pore diameters of filter media Nos. 1 to 8 shown in Table 3 below, which were produced by a melt blow method, were sequentially arranged in ascending order of the filter media number. 3- (trimethoxysilyl) propyl octadecyl was prepared in the same manner as in Example 1 except that a cartridge filter having an inner diameter of 3 cm, an outer diameter of 6.4 cm, and a length of 25 cm produced by winding and laminating the porous core was used. A cartridge filter to which a dehydration-condensation compound of dimethylammonium chloride was attached was obtained.

[0029]

[Table 3]

Comparative Example 3 The filter media 1 to 8 shown in Table 3 were wound and laminated on a porous core in ascending order of the filter media number, and the inner diameter was 3 cm and the outer diameter was 6.4c.
m, a cartridge filter having a length of 25 cm was prepared.

Example 4 Eight types of polypropylene melt-blown nonwoven fabrics having a basis weight of 80 g / m ^{2 and having} different average pore diameters of filter media Nos. 1 to 8 shown in Table 4 below, which were produced by the melt blow method, were added in ascending order of the filter media number. 3- (trimethoxysilyl) propyl octadecyl was prepared in the same manner as in Example 1 except that a cartridge filter having an inner diameter of 3 cm, an outer diameter of 6.4 cm, and a length of 25 cm produced by winding and laminating the porous core was used. A cartridge filter to which a dehydration-condensation compound of dimethylammonium chloride was attached was obtained.

[0032]

[Table 4]

Comparative Example 4 Filter media 1 to 8 shown in Table 4 were wound and laminated on a porous core in ascending order of filter media number, and had an inner diameter of 3 cm and an outer diameter of 6.4 c.
m, a cartridge filter having a length of 25 cm was prepared.

Experiment 1 Water resistance, filtration life,
The collection efficiency was examined by the following method, and the water flow resistance and the filtration life were shown in Table 5, and the collection efficiency was shown in Table 6.

(Water flow resistance) The initial pressure loss when water was passed through the cartridge filter at a liquid volume of 25 liter / min was measured and defined as water flow resistance.

(Filtration life) While uniformly stirring a test solution having a concentration of 10 ppm in which JIS type 11 dust is dispersed in water,
Water is passed through the cartridge filter at a flow rate of 25 liters / minute, the pressure loss is measured, and the differential pressure from the initial pressure is 2.0 kg.
/ Cm ² was measured, and this was defined as the filtration life.

(Collection efficiency) While uniformly stirring a test solution having a concentration of 10 ppm in which JIS type 11 dust is dispersed in water,
Water was passed through the cartridge filter at a flow rate of 25 liters / minute, and the filtrate one minute after the start of water flow was collected. The number of particles contained in this filtrate and the test solution before filtration was determined using a particle size distribution analyzer. The measurement was performed separately, and the collection efficiency at each particle size was determined by the following equation. Collection efficiency (%) = (AB) × 100 / A where A is the number of particles contained in the test solution before filtration, and B is the number of particles contained in the filtrate.

[0038]

[Table 5]

[0039]

[Table 6]

As is clear from Table 5, 3-
In the cartridge filter to which the dehydration-condensation compound of (trimethoxysilyl) propyloctadecyldimethylammonium chloride is attached and the cartridge filter of the comparative example which does not adhere to each other, the same filter material is compared.
The water flow resistance and the filtration life show almost the same performance. But,
As is clear from Table 6, there is a remarkable difference in the collection efficiency. In particular, in the case of collecting particles having a small diameter, the cartridge filter of the comparative example can hardly collect.
The cartridge filter of the embodiment can collect at a rate of 99.7% or more. This difference is particularly noticeable when a low-density filter medium is used. Among the examples, the smaller the number of the example in which many low-density filter media are used, the lower the water flow resistance and the longer the filtration life,
Regarding the collection efficiency, there is no significant difference between the examples.

Example 5 Filter media 1 to 8 shown in Table 1 were wound and laminated on a porous core in ascending order of filter media number, and had an inner diameter of 3 cm and an outer diameter of 6.4c.
m, a cartridge filter having a length of 25 cm was prepared.
On the other hand, a 50% methanol solution of 3- (trimethoxysilyl) propylhexadecyldimethylammonium chloride was added to water, and further diluted with ethanol to give 0.2%.
A weight% water / alcohol mixed solution was obtained. This mixed solution is impregnated into the cartridge filter, and is attached so that the attached amount of the solid content is 0.2% by weight based on the weight of the cartridge filter. Then, the solid solution is dried to obtain 3- (trimethoxysilyl) A cartridge filter to which a dehydration-condensation compound formed by a dehydration-condensation reaction of propylhexadecyldimethylammonium chloride was attached was obtained.

Comparative Example 5 Filter media 1 to 8 shown in Table 1 were wound and laminated on a porous core in ascending order of the filter media number, and had an inner diameter of 3 cm and an outer diameter of 6.4c.
m, a cartridge filter having a length of 25 cm was prepared.
The cartridge filter is impregnated with a 1% aqueous solution of stearyltrimethylammonium chloride so that the solid content is 1% by weight based on the weight of the cartridge filter.
And then dried to obtain a cartridge filter.

Comparative Example 6 Filter media 1 to 8 shown in Table 1 were wound and laminated on a porous core in ascending order of the filter media number, and had an inner diameter of 3 cm and an outer diameter of 6.4c.
m, a cartridge filter having a length of 25 cm was prepared.
On the other hand, a styrylpyridinium-based photosensitive group as shown in Chemical formula 5 is used in an amount of 1.
Polyvinyl alcohol having a polymerization degree of 1700 and a saponification degree of 88 having 3 mol% was dissolved in water to obtain a 0.2% by weight aqueous solution of polyvinyl alcohol. This aqueous solution is impregnated into the cartridge filter and adhered so that the solid content becomes 0.2% by weight with respect to the weight of the cartridge filter. Thus, a cartridge filter was obtained.

[0044]

Embedded image

Experiment 1 was performed in the same manner as in Example 1, etc.
Table 7 shows the flow resistance and the filtration life, and Table 8 shows the collection efficiency.

[0046]

[Table 7]

[0047]

[Table 8]

As is clear from Table 8, the cartridge filters of Examples 1 and 5 provided high collection efficiency.
It can be seen that the cartridge filters of Comparative Examples 5 and 6 have low collection efficiency of fine particles having a small particle diameter. Comparative Example 5
In the cartridge filter of No. 1, it was confirmed that white water was generated in the filtrate when water was passed, and that stearyltrimethylammonium chloride was eluted.

Experiment 2 Water was passed through the cartridge filters manufactured in Examples 1 and 5 and Comparative Examples 5 and 6 at a flow rate of 25 L / min for 10 minutes to wash the water, and the collection efficiency was measured. 4-0.
The collection efficiency of the 5 μm particles is shown in Table 9 in comparison with the collection efficiency measured in Experiment 1 before washing with water.

[0050]

[Table 9]

As is clear from Table 9, in Examples 1 and 5, the collection efficiency was hardly reduced and the durability was excellent. However, in Comparative Example 5, stearyltrimethylammonium chloride was used, and in Comparative Example 6, It can be seen that the uncrosslinked polyvinyl alcohol was washed away and the collection efficiency was greatly reduced.

[0052]

In the cartridge filter of the present invention, since the dehydration-condensation compound formed by the dehydration-condensation reaction of the above-mentioned organosilane compound adheres, quaternized nitrogen capable of strongly adsorbing particles has a large surface area. It exists on the surface of the porous core and the filter medium, and can utilize ionic particle adsorption in addition to physical collection of particles by opening of the filter medium. Therefore, in the cartridge filter of the present invention, fine particles can be collected without reducing the opening diameter of the filter medium, the clogging is hardly performed, the life is long, and the collection efficiency is excellent. Also,
In the cartridge filter of the present invention, the dehydration / condensation compound is insoluble in water and firmly adheres to the surface of the porous core and the surface of the filter medium. No risk of contamination, high safety
No. Moreover, the cartridge filter of the present invention can be obtained by simply immersing the cartridge filter in which the filter medium is wound and laminated on the porous core in the above-mentioned solution of the organosilane compound and then drying the filter, so that the manufacture is extremely simple.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cartridge filter of the present invention.

[Explanation of symbols]

 1 ... porous core 2 ... filter media

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B01D 39/00-39/20

Claims (2)

(57) [Claims] 1. The method according to claim 1, wherein an opening diameter of the porous core is 3 to 70 μm.
In a cartridge filter obtained by winding and laminating a filter material having m, a porous core and the filter material are provided with the following formula: wherein R ¹ is an alkyl group having 1 to 22 carbon atoms,
R ² is an alkyl group having 1 to 4 carbon atoms, X is a halogen atom,
a represents 0 or 1) is a dehydration-condensation compound formed by subjecting an organosilane compound represented by
A cartridge filter for collecting particles, wherein 0.1 to 0.2% by weight is attached to the weight of the cartridge filter. 2. A porous core having an opening diameter of 3 to 70 μm around the porous core.
a cartridge filter comprising a filter medium was wound and laminated with m, the following formula ## STR2 ## (wherein, R ¹ represents an alkyl group having 1 to 22 carbon atoms,
R ² is an alkyl group having 1 to 4 carbon atoms, X is a halogen atom,
After a is imparted with 0 or organosilane compounds represented by representing the 1), 0.1 to the adhesion amount of the dehydrating condensation compound formed by dry relative to the weight of the cartridge filter
A method for producing a cartridge filter for collecting particles, characterized in that the content is 0.2% by weight.