JPH01281105A - Production of carbonaceous filter plate and filter pipe - Google Patents

Abstract

PURPOSE:To produce a carbonaceous filter plate or pipe in which mechanical strength is made large and both pore diameter and permeability can be regulated by curing a cellulosic sheet impregnated with thermosetting resin or a substance wherein the sheet has been wound on the outer peripheral surface of a core material and thereafter calcining the sheet or the substance. CONSTITUTION:Thermosetting resin such as phenol resin and furan resin is dissolved in methanol, acetone and toluene, etc. A cellulosic sheet such as filter paper and kraft paper is immersed in this solution, and impregnated therewith and thereafter precured at the prescribed temp. This sheet is placed on a graphite plate or wound on a core material or furthermore laminated and cured and then calcined at the temp. not lower than 800 deg.C in the nonoxidizing atmosphere. The obtained carbonaceous filter plate or pipe is excellent in heat resistance, mechanical strength and chemical resistance and required pore diameter and permeability can be regulated by regulating the impregnated amount and the filter plate or pipe can be utilized for precision filtration and ultrafiltration.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is a carbon material that can be used for precision filtration or ultrafiltration in fields such as bioindustry, medicine, and food industry.
The present invention relates to a method for manufacturing a filter plate and a filter tube.

[Conventional technology]

Precision 1 filtration, ultrafiltration; filtration is widely used in various fields, and most of the filtration membranes used therein are organic.

[Problem to be solved by the invention]

However, organic filtration membranes have low heat resistance and mechanical strength.
In addition, it is easily affected by chemicals, solvents, etc., and its usage conditions are often restricted physically and chemically.

That is, due to heat resistance problems, steam sterilization or filtration at high temperature F cannot be performed, and due to mechanical strength problems, high operating pressures change the membrane structure.

Furthermore, if a strong acid, strong alkali, or organic solvent is used, the life span will be shortened in many cases. Furthermore, there are drawbacks such as the inability to arbitrarily select the pore size of the filtration membrane using the same material.

As a result of intensive research in order to obtain a filtration membrane with almost no physical or chemical defects, the present inventors have previously proposed a carbon tube manufacturing method (Japanese Patent Application Laid-Open No. 61-58808). discovered that the pore diameter of the porous carbon material could be controlled by changing the amount of thermosetting Al111 impregnated.

The present invention was made based on the above discovery, and uses a carbonaceous material with excellent heat resistance, mechanical strength, chemical resistance, etc. that can be used for precision filtration, ultrafiltration, and filtration. An object of the present invention is to provide a method for manufacturing a plate and a filter tube.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, in the case of one filter plate, a cellulose sheet is coated with a thermosetting resin of 25 to
In the case of a filtration tube, a cellulose sheet impregnated with 30 to 15% by weight of thermosetting resin is wrapped around the outer surface of the core material, hardened and fired. .

As the cellulose sheet used in the present invention, ichito paper, linter paper, kraft paper, etc. are used.

In addition, as the thermosetting resin, phenol resin, furan resin, etc. are preferable, and methanol, ethanol,
Before use, it is dissolved in an organic solvent such as acetone or toluene to an appropriate concentration.

To make a carbonaceous filtration material using these materials, first,
A cellulosic sheet is dipped in a thermosetting resin solution to impregnate it, then pulled up and precured at a predetermined temperature for several minutes to form prepreg paper.

When creating a carbonaceous 1 filtration root, place the prepreg paper on an alumina plate or graphite plate, and after curing,
Calcinate at a temperature of 800° C. or higher in a non-oxidizing atmosphere.

In addition, when making a filtration tube, the above prepreg paper is wound around a core material and laminated to the desired thickness, but since the shrinkage during firing is large, a paper tube is used as the core material. When fired under the same conditions as the filter plate, the paper tube becomes carbonized during the firing process and is easily removed. In addition, if the core material is an iron core, the wrapped prepreg paper is removed, cured and fired, or the iron core is removed and the iron core is removed and baked after being cured while being wound around the iron core. .

The reason why the carbonaceous filter material produced by the above operation determines the desired diameter of pores or air permeability is as follows. That is, when pre-curing and producing prepreg paper, the organic solvent evaporates, and the cellulose sheet uniformly carries the thermosetting resin, and by firing it, a porous carbon material is obtained. The diameter of the pores is determined by how much of the resin fills the cellulose mm gaps in the cellulose sheet. If a large amount of resin is uniformly impregnated, the pore size and porosity become smaller, so the size of the resin to be impregnated can be freely adjusted by adjusting the resin concentration in the organic solvent with which the cellulose sheet is impregnated.

When the carbonaceous filter material of the present invention is used for precision) filtration or ultrafiltration, its pore size is 10 (~10 μm).

Air permeability at N2 gas, room temperature, and differential pressure of 1 atm is 10
``Selected from the range of 2 to 20 Cd/SeC.

〔Example〕

Next, the present invention will be explained with reference to Examples.

Examples 1-3. Comparative Example 1 Commercially available) door paper (Toyo Roshi Co., Ltd.!!!j) was dissolved in ethanol and various phenolic resins (BRL-1207 manufactured by Showa Denko K.K.) were dissolved in phenolic resin solutions with different concentrations. After soaking, pull it out and heat it to 120
It was heated at ℃ for 5 minutes to produce a 300 m square prepreg paper. Wrap this around an iron core with a diameter of 20#I, wrap heat shrink tape around the outside, and heat it in an oven at 160℃ for 2 hours.
The resin was cured by heating for a period of time to create a laminated tube.

The iron core was removed from this laminated tube, and then fired at 800°C for 100 hours in a non-oxidizing atmosphere to reduce the inner diameter to 16II1.
1. A carbon tube with a wall thickness of 11III+ was made.

The bending strength of carbon tubes made by changing the amount of resin impregnated,
The air permeability was measured and shown in Table 1, and the relationship between pore diameter and cumulative porosity is shown in FIG. Note that the air permeability is a value measured using N2 gas, room temperature, and a differential pressure of 1 atm, and the pore diameter is a value measured using a mercury porosimeter.

As a comparative example, similar measurements were performed using Toyo Tanso TG11, and the results are shown together with the examples.

As shown in Table 1 and Figure 1, compared to IGl 1, the carbon) filter plate and carbon) filter tube obtained by the present invention function as a sieve necessary for filtration. It has sufficient open pores and has excellent strength. Further, according to this manufacturing method, a thin film necessary as a filtration film can be easily obtained.

(Effect of the invention) As described above, the method of the present invention produced;
The filter material is carbonaceous, so it has excellent heat resistance and chemical resistance, and since the cellulose paper becomes carbon fiber after firing, it has high mechanical strength, and the amount of thermosetting resin impregnated can be easily adjusted. As a result, carbonaceous filter plates or pipes with desired pore diameters and air permeability that can be used for precision U' filters and ultra-high-quality filters can be obtained without being restricted by physical or chemical conditions. , 1 filtration operation, it will greatly contribute to this field.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the relationship between the pore diameter and cumulative porosity of a filter tube produced by the method of the present invention and a commercially available carbon material.

Claims (2)

[Claims] (1) 25 to 10% thermosetting resin on cellulose sheet
A method for manufacturing a carbonaceous filter plate, characterized by impregnating it with a weight percent, hardening and firing. (2) A method for manufacturing a carbonaceous filtration tube, which comprises wrapping a cellulosic sheet impregnated with 30 to 15% by weight of a thermosetting resin around the outer peripheral surface of the core material, curing and firing.