JPH02233140A - Adsorbing material - Google Patents

Abstract

PURPOSE:To improve the appearance of an adsorbing material without lowering adsorbability by forming the adsorbing material by coating the adsorbing material composed of activated carbon with plastic such as a thermoplastic polymer so as not to damage the adsorbability thereof. CONSTITUTION:Plastic coating is applied to an adsorbing material composed of activated carbon so as not to damage the adsorbability thereof while heating, far infrared rays, ultrasonic waves, a microwave, high frequency and static electricity are simultaneously applied to the adsorbing material to obtain a coated adsorbing material. In this case, a method for coating the surface of the adsorbing material with a color component powder and a plastic fine powder or a method for coating the surface of the adsorbing material with a conductive powder and a plastic fine powder is pref. As the adsorbing material to be used, one having a surface area of several 100m or more per 1g like activated carbon is pref. As the aforementioned plastic, there are a thermoplastic resin and a thermosetting resin.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an adsorbent that can be used as a deodorizing agent, a water purifying agent, and the like.

[Prior Art] Adsorbents are widely used as general consumer products such as deodorizers and water purifiers. However, the surface has a poor appearance and the color tone is bland, such as white or black.

For example, activated carbon is black and does not have a beautiful appearance or gloss, which is an obstacle to using activated carbon in a state where it can be seen directly from the outside.Also, if you touch it with your hand, your hand will turn black, or it will wear out due to friction when you move it. There are problems such as black dust coming out.

[Problems to be Solved by the Invention] The purpose of the present invention is to solve the above-mentioned problems and to further expand its applications. [Means for Solving the Problems] In order to solve the above problems, the present invention provides an adsorbent in which the adsorbent is coated with plastic so as not to impair its adsorption properties, and a suitable manufacturing method thereof. Stiffness will be explained in detail below.

(Adsorbent) As the adsorbent, any commonly used adsorbent such as activated carbon, zeolite, silica gel, alumina gel, etc. can be used.

The particles of the adsorbent used in the present invention may be of any kind, and various particle sizes can be used, ranging from several micrometers to several micrometers, but the particle size is not limited thereto.

The adsorbent used here usually has a large surface area of several hundred square meters or more per gram, such as activated carbon, and can be used in a wide range of materials as long as it exhibits high adsorption properties.

For example, in the case of activated carbon, the material used is usually carbonized material such as coconut shell or wood, or coal, but any material may be used. The activation method also uses water vapor or carbon dioxide at high temperature or zinc chloride,
It may be obtained by either phosphoric acid or agricultural sulfuric acid treatment.

Moreover, any form of adsorbent such as crushed charcoal, granulated charcoal, granulated charcoal, adsorbent fiber, adsorbent felt, adsorbent fabric, or adsorbent sheet can be used. For handling purposes such as pressure loss and replacement, it may be convenient to use granulated charcoal or a sheet adsorbent with an adsorbent attached.

Granulated coal is prepared by adding 30 to 60 parts of petroleum pitch or coal tar as a binder to 100 parts of carbon material as a binder, mixing and forming the coal, and activating it according to the conventional method.For zeolite, both natural zeolite and synthetic zeolite can be used. It is.

(Adhesive material) Suitable plastics for coating the surface of the adsorbent include thermoplastics, mesophyz pitch, and other materials that can be heat-fused without using water or organic solvents.

The plastic according to the present invention may be one that can impart colorability, adhesiveness, and conductivity when attached to the surface of the adsorbent.

Furthermore, by selecting plastics, it is possible to impart a composite function between the material and the adsorbent, making it possible to develop even newer uses. Here, plastic refers to thermoplastic resin, thermosetting resin, tree-like resin, conductive resin, and the like.

Thermoplastic resins include polyethylene, polypropylene,
ABS% PET, nylon, PBT, ethylene acrylic resin, PMMA@Mari, mesophase pitch, etc. can be used.

Examples of thermosetting resins include furan resins and phenol resins.

Hydrophilic resins include polyvinyl alcohol resin and EVAL resin.

Examples of the conductive resin include polyvinylpyrrole and polyacetylene.

It is preferable to use these plastic resins depending on the purpose of use. In other words, when used to adsorb aqueous solutions, it is best to use a hydrophilic polymer as an adhesive, and when used to filter oils, organic solvents, etc., it is best to use a hydrophobic polymer as an adsorbent because of its affinity for the target substance. It is preferable in this respect.

(Manufacturing method) The impregnation method involves adding plastic powder and adsorbent particles.
It can be manufactured by mixing in a predetermined ratio. A specific method for producing the coated adsorbent will be described below.

The ratio of plastic to adsorbent varies depending on the particles and specific gravity of the adsorbent, but it is preferably 1 to 100 parts by weight of plastic per 100 parts by weight of adsorbent, but it should be the minimum necessary from the viewpoint of preventing a decrease in adsorption capacity. is good.

The impregnation method can be achieved by mixing, and the mixing method can be a normal industrial mixing method such as a mixer, ribbon mixer, static mixer, ball mill, sample mill, kneader, etc., but is not limited to this. . Adhesion can be achieved by mixing alone, but in order to strengthen the adhesion between the plastic and the adsorbent, it is recommended to perform simple heating during mixing. Heat sources include static electricity, microwaves, infrared rays, far infrared rays,
Although the adhesion can be made stronger by simultaneously irradiating high frequency waves or the like during mixing, it is not necessary to use these. By such an operation, the adhesive can be attached with sufficient strength to prevent peeling.

By coating the surface of the adsorbent with a plastic component using such a method, a plastic-coated adsorbent can be obtained without reducing the adsorption capacity of the adsorbent.

The adsorptivity of an adsorbent is usually expressed as the amount of adsorption when saturated vapor of benzene or acetone is adsorbed in equilibrium at a constant temperature (JIS Kl474). Here, "so as not to impair the adsorptivity" means to the extent that it can be used when the plastic coated adsorbent is used as an adsorbent. Although it is desirable to attach the adsorbent without damaging it at all, this is often difficult in practice. but,
If the adsorbed amount is about 50% or more of the unimpregnated adsorbent, it can be used sufficiently for normal purposes, and depending on the application, it can be used even if it is even lower. Any plastic material may be used as long as it can be attached to the adsorbent in a manner that maintains the above-mentioned adsorption properties.

The plastic-coated adsorbent thus obtained had the plastic components firmly adhered to it, and the plastic did not peel off even when rubbed. Furthermore, there was almost no decrease in adsorption performance.

In addition, it is also possible to make a molded object by adhering these particles to each other, and furthermore, it is also possible to make a multilayer structure.

[Effects of the Invention] The plastic-coated adsorbent according to the present invention can improve the appearance of the adsorbent without impairing its adsorption properties, and by attaching a colored substance to the surface of the adsorbent, various aesthetic effects can be achieved. Not only can it provide a variety of colors, but it can also have a variety of surface textures such as smooth and velvety.

In addition, if the adsorbent is activated carbon, coating its surface with plastic will prevent your hands from turning black even if you touch the adsorbent directly, or will significantly prevent black dust from being generated due to friction. be able to. As a result, for example, conventional activated carbon adsorbents are black and do not have a beautiful appearance or gloss, and they tend to generate black dust, so they cannot be used in situations where they can be seen directly from the outside or where they can be touched. However, the present invention makes it possible to use it in a wide range of applications such as deodorizing materials and adsorbents.

Furthermore, depending on the properties of the colored substance, it is possible to expect high adsorption due to a synergistic effect with the adsorbent base material, an effect as an indicator of the degree of adsorption, or a special effect by adding a third substance. .

[Example] (Example 1.1) 20 parts by weight of polyethylene with a center particle diameter of 20 μm and coconut shell activated carbon with a particle diameter of 10 to 32 mesh (benzene adsorption capacity 5
When 100 parts by weight (8wt%) of the mixture was put into a mixer and stirred for 10 minutes, the plastic was mostly adhered and peeled off easily. When this was fluidized and heated in hot air, the white powder became transparent, and when it was cooled, a slippery coated activated carbon was obtained.

Even when this was rubbed, no coal dust was generated.

This was poured into a mold having an inner dimension of 50a+mφxloma+H, and crimped at 100°C for 30 minutes under a pressure of 10kg/cm''.

After cooling, it was taken out and its adsorption performance and strength were measured.

Benzene adsorption capacity is 55wt%/, compressive strength is 20kg
Met.

For comparison, 10% by weight of vinegar emulsion was mixed with the same activated carbon and molded, and after drying, the adsorption performance and strength were measured. Benzene adsorption performance is 40%, strength is 0.1kg
Met.

(Example 1.2) 7 parts by weight of polypropylene with a center particle size of 150 μm and silica gel with a particle size of 8 to 32 mesh (water adsorption capacity 43 wt)
%) was placed in a mixer and stirred for 10 minutes while irradiated with infrared rays. When taken out, most of the plastic was attached and there was little peeling. A uniform coating was achieved. When the powder was fluidized and heated in hot air, the white powder became transparent, and when it was cooled, a smooth coated silica gel was obtained. No fine powder was generated.

The inner dimension of this is 1 0 0++nX 1 00ms+X
1 Pour into a 0+amH mold and heat at 100°C for 30
The bonding was carried out under a pressure of 10 kg/cm'' for 1 minute.

After cooling, it was taken out and its adsorption performance and strength were measured.
The water adsorption capacity was 40 wt%, and the compressive strength was 25 kg.

For comparison, 10 wt% of acrylic emulsion was added to the same silica gel and molded, and after drying, the adsorption performance,
The strength was measured. Moisture adsorption capacity is 21%, strength is 0.1k
It was g.

(Example 1.3) 30 parts by weight of polyethylene with a center particle diameter of 10 μm and zeolite with a particle diameter of 3III1 (ammonia adsorption capacity 15 wt.
%) was put into a ball mill, stirred for 60 minutes, and then taken out. Most of the plastic was attached and there was no peeling. When this was fluidized and heated in hot air, the white powder became transparent, and when cooled, a smooth polyethylene-coated zeolite was obtained. Even when this was rubbed, no dust was generated.

This was poured into a mold having an inner dimension of 50 mmH and crimped at 120° C. for 30 minutes under a pressure of 10 kg/cm1.

After cooling, it was taken out and its adsorption performance and strength were measured.
Ammonia adsorption capacity is 13wt%, compressive strength is 25kg
Met.

For comparison, 10% of PVC emulsion was added to the same zeolite.
After drying, the adsorption performance and strength were measured. The amount of animonia adsorbed was 8 wt%, and the strength was 0.2 kg.

(Example 2.1) 8 parts by weight of polyethylene with a center particle diameter of 20 μm, 3 parts by weight of red colored ceramic powder, and 100 parts by weight of coconut shell activated carbon of 10 to 32 mesh (benzene adsorption capacity 45 wt%) were placed in a rotary mixer for 30 minutes. When taken out after stirring for a minute, most of the plastic and coloring components were attached to the activated carbon and did not peel off. When this was fluidized and heated in hot air, the colored components were firmly adhered, and when it was cooled, beautiful red activated carbon was obtained. Even when this was rubbed, no coal dust was generated. This was poured into a mold with an internal dimension of 501IIIφXIOwH, and crimped at 100°C for 30 minutes under a pressure of 10kg/c+a''. After cooling, it was taken out and its adsorption performance and strength were measured.
The benzene adsorption capacity was 42 wt%, and the compressive strength was 20 kg.

For comparison, the same activated carbon was molded with 10% vinegar emulsion, and after drying, the adsorption performance and strength were measured.

The benzene adsorption performance was 28% and the strength was 0.1 kg.

(Example 2.2) 8 parts by weight of polypropylene with a center particle size of 100 μm, 3 parts by weight of red iron powder, and 10 to 32 mesh zeolite (
When 100 parts by weight (moisture adsorption capacity 25 wt%) was put into a rotary mixer and stirred for 30 minutes, it was taken out, and the plastic and coloring components were mostly attached and there was no peeling. When this was fluidized and heated in hot air, the colored components were firmly adhered, and when it was cooled, a beautiful red zeolite was obtained. No dust was generated.

This was poured into a mold with an inner dimension of 50 Il x φ x loa + mH, and crimped at 100°C for 30 minutes under a pressure of 10 kg/c+s''. A red block-shaped zeolite was obtained. After cooling, this was taken out. The adsorption performance and strength were measured.

The water adsorption capacity was 23 wt%, and the compressive strength was 25 kg.

For comparison, 10% of vinegar biemalzidine was added to the same zeolite.
After drying, the adsorption performance and strength were measured. The water adsorption performance was 12% and the strength was 0.5 kg.

(Example 2.3) 10 parts by weight of nylon with a center particle diameter of 5 μm, 10 parts by weight of titanium oxide powder, and 100 parts by weight of activated carbon of 10 to 32 mesh (benzene adsorption capacity 48 wt%) were placed in a rotary mixer and stirred for 30 minutes. When I took it out, most of the plastic and coloring components were still attached and there was no peeling. When this was fluidized and heated in hot air, the colored components were firmly adhered, and when it was cooled, beautiful white activated carbon was obtained. No coal dust was generated.

This was poured into a mold with inner dimensions of 50 mm φ x 10 mm H, and pressed at 100° C. for 30 minutes under a pressure of 10 kg/cm. White block-shaped activated carbon was obtained.

After cooling, it was taken out and its adsorption performance and strength were measured.

The benzene adsorption capacity was 40 wt%, and the compressive strength was 25 kg.

For comparison, 10% of acrylic emulsion was added to the same activated carbon.
After drying, the adsorption performance and strength were measured. The benzene adsorption performance was 32% and the strength was 0.1 kg.

(Example 3.1) 12.5 parts by weight of polyethylene with a center particle size of 10 μm, 40 parts by weight of graphite powder with a center particle size of 10 μm, and 100 parts by weight of granular activated carbon of 10 to 32 mesh were placed in a mouth-tally mixer and stirred for 30 minutes. When I took it out after doing so, I found that most of the plastic and conductive components were attached and there was no peeling. When this was fluidized and heated in hot air, the conductive component was firmly adhered to it, and when it was cooled, an activated carbon with electricity-generating properties was obtained. No coal dust was generated.

This was poured into a mold with an inner dimension of 501IIIllφXtO Dragon H, and heated at 100°C for 30 minutes at 10 kg/Cl.
A block-shaped activated carbon was obtained. After cooling, this was taken out and its adsorption performance etc. was measured.

The benzene adsorption capacity was 38 wt%. When electricity was passed through this molded body, a current of 2.5 A at 40 V flowed, and the temperature could be raised to 60°C. Moreover, the compressive strength was 15 kg.

For comparison, 10% of acrylic emulsion was added to the same activated carbon.
% was added and molded, and the strength was measured after drying. The strength was 0.1 kg.

(Example 3.2) 25 parts by weight of polyethylene with a center particle size of 30 μm, 25 parts by weight of graphite powder with a center particle size of 10 μm, and 100 parts by weight of 6-8 mesh spherical silica gel are placed in a rotary mixer, stirred for 30 minutes, and then taken out. Most of the plastic and conductive components were adhered to each other and there was no peeling. When this was fluidized and heated in hot air, the conductive component was firmly adhered to it, and when it was cooled, a silica gel having electrical heating properties was obtained.

Pour this into a mold with internal dimensions of 501IIfflφX10++usl{10kg/c at 100℃ for 30 minutes.
- It was crimped under a pressure of -. A block-shaped silica gel was obtained.

This is taken out after cooling, and after adsorbing 10 wt % of water, the adhesion curve is shown when air is flowed at 5, &/min while electricity is applied to remove the adhesion. At 40V, a current of 0.6 ampere was applied, and the temperature was raised to 60°C, and the pink color returned to blue. The compressive strength was 25 kg.

For comparison, a 10% emulsion was molded into the same silica gel, and after drying, the adsorption performance and strength were measured.

Electricity could not be applied, and a silica gel block that could be regenerated by electricity was not obtained. Moreover, its strength was 0.1 kg.

(Example 4.'l) Plastic-coated 1 073 2 mesh activated carbon (benzene adsorption capacity 45 wt%) was added to 25 φX7
It was molded into a cylinder of 0 mmφ x 250 mmH, placed in a cartridge, and the pressure loss was measured. The benzene adsorption capacity of this block was 40%.

(Example 4.2) 10 parts by weight of polyethylene with a center particle diameter of 20 μm and 10 ~
When 100 parts by weight of 32-mesh coconut shell activated carbon was placed in a mixer and stirred for 10 minutes, it was taken out, and most of the plastic was adhered to the mixer, with no peeling. When this was fluidized and heated in hot air, the white powder became transparent, and when it was cooled, a slippery coated activated carbon was obtained.

10 parts by weight of polyethylene with a center particle diameter of 10 μm and 300 parts by weight
Put 100 parts by weight of μm zeolite into a ball mill and
When taken out after stirring for a minute, most of the plastic was still attached and did not peel off.

When this was fluidized and heated in hot air, the white powder became transparent, and when cooled, a slippery zeolite was obtained.

These two plastic coated adsorbents were poured into a mold with inner dimensions of 50 mmφ x 10 mmH and heated to 120°C.
Pressure bonding was carried out for 30 minutes under a pressure of 10 kg/c♂. An adsorbent block capable of adsorbing both ammonia and benzene was obtained.

(Example 5.1) Zeolite [Molecular Sieve 3A] with a center particle diameter of 3μ in 100 parts by weight of spherical activated carbon with a center particle diameter of 1.5 mm (benzene adsorption capacity 35%) (ammonia adsorption capacity 15%)
After thoroughly mixing 50 parts by weight of polyethylene fine powder and 20 parts by weight of polyethylene fine powder having a center particle diameter of 10 μm, the mixture was granulated by a transfer granulation method while being heated.

An adsorbent with zeolite powder firmly bonded to the surface of spherical charcoal was obtained.

The breaking strength of this adsorbent is 15 kg/mm'', the benzene adsorption capacity is 20 wt%, and the ammonia adsorption amount is 5 w.
It was t%.

Applicant: Kuraray Chemical Co., Ltd.

Claims (10)

[Claims] (1) Adsorbent material coated with plastic so as not to impair its adsorption properties. (2) The adsorbent according to claim 1, wherein the plastic is a conductive polymer, a thermosetting polymer, a thermoplastic polymer, and/or a hydrophilic polymer. (3) The adsorbent according to claim 1, wherein the plastic is a colored material containing a pigment. (4) A conductive adsorbent characterized by coating the surface of the adsorbent with conductive powder and fine plastic powder. (5) The adsorbent according to claim 1, which is coated with an ultraviolet curable polymer. (6) An adsorbent molded body made by fusing adsorbent particles coated with plastic. (7) The adsorbent molded article according to claim 6, wherein a plurality of different adsorbents are coated in multiple layers. (8) Heating, far infrared rays, ultrasound, microwaves, high frequency,
A method for producing an adsorbent that is characterized by simultaneously applying static electricity and coating the adsorbent with plastic so as not to impair its adsorption properties. (9) A method for producing an adsorbent, which comprises coating the surface of the adsorbent with colored component powder and fine plastic powder. (10) A method for producing a conductive adsorbent, which comprises coating the surface of the adsorbent with conductive powder and fine plastic powder.