JP2006314984A - Refractory nonflammable filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refractory nonflammable filter capable of disposal and excellent in refractory properties and removability of oil mist, smoke and odor by adsorption. <P>SOLUTION: This refractory nonflammable filter is formed: by applying solutions of high-molecular weight siloxane and silanolate in a prescribed volume ratio over the entire substrate for forming an air-permeable hole which is made of nonwoven fabric or rock material having a high porosity using an extra-fine mineral fiber or glass fiber material having a prescribed thickness and a size; and foaming an inorganic foam of silicon oxide in a range of 5 to 20 times by volume at a temperature of 200°C or more so that an inorganic foam of silicon oxide is firmly wrapped on the outer periphery surface of the fiber material and the entire foam is integrally adhered thereon while maintaining the porosity of the foam not less than 30%. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fire-resistant and non-flammable filter. More specifically, it is extremely suitable for a filter that requires oil mist, odor, or smoke removal in addition to fire-resistant and non-flammable, such as a filter for kitchen and smokeless roaster. It relates to incombustible filters.

Conventional technology

  In recent years, along with urbanization, conventional individual commercial stores are also being added to large building facilities and collective building facilities, but in restaurants, a large amount of ingredients are cooked daily and provided, In particular, in cooking such as stir-fried, baked or fried, smoke and odor are generated along with the generation of a huge amount of oil mist.

  For this reason, oil mist, smoke, odor, etc., especially oil mist generated in large quantities, is sucked so that it does not diffuse into the store and is discharged outside the facility with a high removal rate. A filter for removal is installed, but in conjunction with the fact that cooking with oil and wine entangled in ingredients such as stir-fried Chinese food and French flambe is also used in the filter Because high temperature is added, the current filters are exclusively used for woven wire materials made of refractory and non-combustible materials such as iron, stainless steel, aluminum, etc., those obtained by lath processing of plate materials, or porous ceramic plates. Yes.

  In addition, with the diversification of tastes today, eating and drinking are also cooked by the cook, self-cooking according to their own taste, i.e., grilled meat restaurants etc. Because so-called self-cooking offers are rapidly spreading, food and drink are fried, baked, fried, etc. for each table, which causes oil mist, smoke, and odor to be produced for each table. As a result, the eating and drinking environment in the store will be significantly deteriorated, so a smokeless roaster is installed at each table and the oil mist, smoke, odor, etc. generated are immediately sucked and filtered with a filter. A method of removing it from the exhaust duct through the exhaust duct after adsorption removal is being adopted.

  However, the current kitchen filters and smokeless roaster filters are, as described above, woven wires made of refractory and non-combustible materials such as iron, stainless steel and aluminum, lathed plate materials, or porous ceramic plates Since the oil mist and air containing smoke and odor are inserted through this filter and the oil mist is physically attached to the filter and removed, the oil mist removal effect is enhanced if the filter is fine. If the oil is clogged with oil in a short time and is rough, the removal effect is low, resulting in a large amount of oil mist discharged outside the facility, and of course, the removal of smoke and odor is nothing at all.

However, these filters are relatively expensive, but the amount of oil mist generated depending on the amount of cooking, the cooking method, or the ingredients varies significantly. Chemical chemical cleaning has to be done, and the maintenance cost for this has been enormous.
In addition, in recent years, legislation to prevent the diffusion of smoke and odors has been studied, as well as the reduction of oil mist discharged from restaurants to the outside of the facility. I'm sorry.

  In view of this situation, the group working on the research together with the inventors, etc., has a large amount of silicon oxide contained in natural minerals such as volcanic ash and shirasu, and inorganic industrial waste such as coal ash, cast waste sand, and incineration sludge. Siloxane and silanol salt multi-molecular weight solution by making the molecular weight to be about 4,000 or more by the condensation action of silanol group of this sodium silicate, Thus, the composition is an aqueous solution in which the solid content of siloxane and silanol salt is approximately 20 to 25% by weight and water is approximately 75 to 80% by weight, and the water content is obtained by heating at 100 ° C. or higher. It has been clarified that a foamed structure of about 50 times is generated with transpiration and exhibits a strong heat-fusibility.

Since the silicon oxide inorganic foam obtained by heating and foaming the siloxane and silanol salt multi-molecular weight solution has a closed cell structure containing fine open cells, a ventilation hole for maintaining air permeability for use in a filter. The formation of is essential.
For this reason, non-woven fabrics with the required thickness and voids using the properties of foamed structures of siloxane and silanol salt multi-molecular weight solutions at relatively low temperatures, and materials such as cotton, hemp or pulp that can be burned off at high temperatures The siloxane and silanol salt multi-molecular weight solution is heated and foamed in a state in which the air hole forming material in the form of a rock or a lock material is mixed to form a silicon oxide-based inorganic foamed plate material once, and thus the burning temperature of the air hole forming material The prior application has already been made in view of the fact that a filter in which air holes are formed is produced by burning out the air hole forming material.

  However, such a filter burns out the air hole forming material at a high temperature, but once the air hole forming material is mixed in the production aspect, a silicon oxide inorganic foamed plate material is once formed, and further the air passing material is further removed. Even when the air hole forming material mixed in the inorganic foam board is burned off at a high temperature in the process of burning the air hole forming material, a large amount of fuel ash remains in the air hole that is bent flexibly. For this reason, there is a problem that the cost is high in addition to the poor productivity, such as being forced to work with high-pressure air to remove this.

  The inventors have conducted extensive research based on this background, and as a result, used non-woven fabrics or lock materials formed with a sufficiently large porosity using ultrafine mineral fibers or glass fiber materials as the vent hole forming substrate. By applying a siloxane and silanol salt multi-molecular weight solution to the entire pore-forming substrate, heating and foaming, and adjusting the expansion ratio of the formed silicon oxide-based inorganic foam, appropriate voids depending on the size of the air holes are obtained. It was clarified that a filter having a low rate can be formed at low cost, and the present invention has been achieved.

  An object of the present invention is to provide a fire-resistant and non-flammable filter that is extremely fire-resistant and excellent in the adsorption and removal of oil mist, smoke and odor, is inexpensive and can be discarded.

  The technical means used by the present invention in order to solve the above-mentioned problem is that a voidage of at least 30% or more can be obtained by a silicon oxide-type anaerobic foam that can be discarded after use and is formed by heat foaming. In order to form it integrally, a ventilation hole-forming substrate made of a non-woven fabric or a lock material having a sufficiently large porosity using an extremely fine mineral fiber or glass fiber material is used, and it is passed through at a required thickness and size. The siloxane and silanol salt multi-molecular weight solution is applied in the required volume ratio over the entire pore-forming substrate, and the coated siloxane and silanol salt multi-molecular weight solution is heated and foamed in a short time and homogeneously. Heating is performed at a temperature of at least 200 ° C.

  In addition, in order to adsorb and remove smoke and odors, including oil mist mixed in large quantities during ventilation, closed cells containing fine open cells on the outer peripheral surface of the fiber material of the air hole forming base formed in a complicated bend In addition, the silicon oxide inorganic foam is firmly encapsulated at a foaming ratio of 5 to 20 times so that the porosity is maintained at least 30% or more, and the whole is fixed in an integrated plate shape. Lies in the construction of a fireproof and incombustible filter.

Furthermore, since a large aeration pressure is applied at the time of adsorption removal at a huge aeration amount, it is necessary to sufficiently increase the structural strength.
As a countermeasure for this, foam formation is performed by applying a siloxane and silanol salt multi-molecular weight solution to the whole vent-hole forming material at a required volume ratio and then heating and foaming at a high temperature of 600 to 900 ° C. The structure of the refractory / incombustible filter has a structure in which the silicon oxide inorganic foam is formed into a glass layer and the structural strength is further increased.

  Since the present invention is composed of the above-described configuration, the air-hole forming substrate is made of a non-woven fabric or a glass fiber material having a sufficiently high porosity using an extremely fine mineral fiber or glass fiber material. Although the amount of mineral fiber or glass fiber material used in the air hole forming substrate is very small, a large number of relatively large voids are formed three-dimensionally and are extremely flexible and easily deformed. The siloxane and silanol salt multi-molecular weight solution is coated on the substrate at the required volume ratio, and is heated at a temperature of at least 200 ° C. and foamed by heating 5 to 20 times, thereby forming the air vent forming substrate. The silicon oxide inorganic foam containing fine and enormous number of open cells and closed cells is tightly encapsulated on the outer peripheral surface of the fiber material to be processed. Whole, the handling property becomes integrally fixed has been rigidly hardness Do plate is remarkably improved.

  And, since the silicon oxide inorganic foam is firmly encapsulated, the air holes are appropriately narrowed and the porosity is maintained at 30% or more. The oil mist that is in a silicon oxide state is fine and is physically contacted and chemically adsorbed on an inorganic foam containing a large number of open cells and closed cells. Smoke and odor are also adsorbed in the open bubbles, so that emission of smoke and odor from the facility is remarkably suppressed.

  In addition, the air-hole forming substrate used in the present invention uses ultrafine mineral fibers or glass fibers, and the amount used is very small, so after adsorption removal with the silicon oxide inorganic foam formed by foaming It can be said to be a fire-resistant and non-combustible filter having many excellent features, such as being easily crushed and being able to be disintegrated in the short term outdoors and reduced to soil.

  Using an air-hole forming substrate made of a nonwoven fabric or a lock material having a large porosity with an extremely fine mineral fiber or glass fiber material at a required thickness and size, a siloxane and silanol salt multi-molecular weight solution is applied to the entire air-hole forming substrate. After coating at the required volume ratio, heating is performed at a temperature of 200 ° C. or higher, and the foam is heated and foamed to a foaming ratio of 5 to 20 times to firmly wrap the silicon oxide inorganic foam on the outer peripheral surface of the fiber material. The whole is fixed integrally, and the porosity is maintained and formed at a ratio of 30% or more.

  In the following, the embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional explanatory view of a ventilation hole forming substrate 1A made of a nonwoven fabric, and FIG. 2 is a sectional explanatory view of a ventilation hole forming substrate 1B made of a locking material. In addition, the air hole forming substrate 1 has sufficient heat resistance when used in the present invention, and is not incombustible when exposed to high temperature air or flame, and a short-term replacement occurs due to adsorption removal of oil mist and the like. In such a case, an extremely fine mineral fiber or glass fiber material 1C is used so that the volume can be easily reduced and discarded, and the specific fiber material diameter is about 10 to 60 μm. desired.

  Further, the aeration forming substrate 1C is formed by heating and foaming the siloxane and silanol salt multi-molecular weight solution 2 applied to the mineral fiber or glass fiber material 1C to 5 to 20 times to form the mineral fiber or glass fiber material 1C. A large number and appropriate pores 21 are formed by the silicon oxide inorganic foam 20 firmly encapsulated on the outer peripheral surface of the metal, and the porosity is maintained at a ratio of at least 30% or more. Therefore, it is desirable that the porosity of the air hole forming substrate 1 </ b> C be as large as possible in consideration of the variation in the diameter of the air holes 21 caused by the silicon oxide inorganic foam 20.

The nonwoven fabric for the ventilation hole forming substrate 1A made of a nonwoven fabric is not particularly limited as long as it has a desired thickness and a sufficiently large porosity, but is preferably a mechanically bonded felt method or needle. Non-woven fabrics by a punching method or a stitch method, and non-woven fabrics by a spraying method that is a short fiber type can be mentioned.
Further, a lock material for the vent hole forming substrate 1B made of a lock material can be used as long as it has a desired thickness and a sufficiently large porosity, and the mineral fiber or the glass fiber material 1C can be used with a required length and appropriately. In addition, the bulking process is applied, the carding or combing used in the spinning process is performed, and the two are bonded with the heat-resistant adhesive 10B.

The air-hole forming substrate 1 formed as described above is used with a required thickness and size, and the siloxane and silanol salt multi-molecular weight solution 2 is applied at a required volume ratio over the entire area.
This siloxane and silanol salt multi-molecular weight solution 2 elutes silicon oxide, which is contained in large amounts in inorganic industrial waste such as coal ash and cast waste sand, as well as natural minerals such as volcanic ash and shirasu, with an alkaline agent. So that the molecular weight is about 4,000 to 8,000 so that a foamed structure can be formed by the condensation of silanol groups in the sodium silicate so as to form a foam structure accompanying the evaporation of the water. The siloxane and silanol salt multi-molecular weight solution 2 is made to have a polymolecular weight of about 2 and the properties of the siloxane and silanol salt multi-molecular weight solution 2 are such that the solid content of the siloxane and silanol salt in the composition is about 20 to It is in the form of an aqueous solution with a water content of approximately 75 to 80% by weight at 25% by weight, and can produce a foam structure of up to about 50 times by heating at 100 ° C or higher. It is intended.

  As a method of applying the required volume ratio of the siloxane and silanol salt multimolecular weight solution 2 to the whole of the air hole forming substrate 1, it is immersed in the liquid tank of the siloxane and silanol salt multimolecular weight solution 2 or applied. And the silanol salt multi-molecular weight solution 2 is preferably spray-coated using a high-pressure sprayer or the like, and is substantially made of a mineral fiber or glass fiber material 1C forming the air hole forming substrate 1 as shown in FIG. The siloxane and silanol salt multimolecular weight solution 2 may be applied to the outer peripheral surface at a required volume ratio.

In such a case, the coating volume ratio of the siloxane and silanol salt multimolecular weight solution 2 applied to the outer peripheral surface of the mineral fiber or glass fiber material 1C is determined by heating and foaming of the coated siloxane and silanol salt multimolecular weight solution 2. By foaming 5 to 20 times, the porosity of the ventilation hole forming substrate 1 is remarkably reduced. However, in the present invention, a large amount of oil mist, smoke, odor and the like mixed in the ventilation are adsorbed and removed. It is necessary to hold and form at least a porosity of 30% or more.
Therefore, the specific coating volume ratio is the porosity of the air hole forming substrate 1, more specifically, the space between the air holes, the expansion ratio of the siloxane and silanol salt multimolecular weight solution 2 to be applied, and the air holes 21 to be finally formed. It is determined by the void ratio associated with.

  FIG. 4 is a cross-sectional explanatory view of the present invention encapsulated with a silicon oxide inorganic foam 20 by heat foaming, and is a mineral fiber or glass fiber material forming a vent hole forming substrate 1 as shown in FIG. The siloxane and silanol salt multi-molecular weight solution 2 coated on the outer peripheral surface of 1C at a required volume ratio is heated at a temperature of at least 200 ° C., and has a foaming ratio of 5 to 20 times. The silicon oxide inorganic foam 20 is encapsulated and formed so that the rate is maintained at a ratio of 30% or more, and the whole is integrally fixed.

  In such a case, the siloxane and silanol salt multi-molecular weight solution 2 generates a foam structure by heating at 100 ° C. or higher, but the siloxane and silanol salt multi-molecular weight solution 2 has approximately 75 to 80% by weight of water, When heating and foaming at a relatively low temperature, the heat of water evaporation is remarkably lost until the formation of the silicon oxide inorganic foam 20, which not only takes a long time but also generates spots in the heat reception, thereby inhibiting uniform foam formation. Therefore, a heating temperature of at least 200 ° C. or more, preferably about 260 to 350 ° C. is desired.

  The reason why the coated siloxane and silanol salt multi-molecular weight solution 2 is foamed 5 to 20 times by heating is that the fine open cells and the closed cells are large as the foam is expanded at a high expansion ratio. In combination with the formation, oil mist, smoke or odor adsorption / removal increases further, but the foamed inorganic foam 20 becomes brittle and may be damaged during handling. This is because the adsorption and removal of odor and odor are not fully demonstrated.

  The expansion ratio is roughly determined by the heating temperature and the heating time, and varies somewhat depending on the coating volume ratio of the siloxane and silanol salt multimolecular weight solution 2 to be coated. However, when the heating temperature is 200 ° C. When the heating temperature is about 300 ° C. for about 3 to 8 minutes, foaming can be formed 5 to 20 times in about 1 to 3 minutes.

More preferably, the vent-forming substrate 1 is used in the required thickness and size, and the siloxane and silanol salt multi-molecular weight solution 2 is applied over the whole in the required volume ratio and then heated and foamed. In the free state, there is a risk of dimensional variations such as thickness and size, deformation, etc. of the product 3 of the present invention formed by internal distortion of the air hole forming substrate 1 and heating foaming spots.
For this purpose, it is desired to use an appropriate heating and foaming frame formed of a metal plate material or a metal netting material or the like and to perform heating and foaming while restricting heating and foaming.

  The heating means can be set to a required heating temperature and heated in a heating furnace having a sufficient heating capacity to batch-form a plurality of sheets to form foam, or to add heated air at a desired temperature. A continuous heating means for continuously transferring to the tropics and heating and foaming can be used, and the product 3 of the present invention is formed through such heating and foaming means.

  In addition, when adsorbing and removing oil mist, smoke, odor, etc. during a huge amount of ventilation, a great ventilation pressure is applied to the product 3 of the present invention, so that a structural strength that can withstand the great ventilation pressure is required. Therefore, as such a countermeasure, when the foaming is performed by heating and foaming at a high temperature of 600 to 900 ° C., the foamed silicon oxide inorganic foam 20 is formed into a glass layer, and the structural strength is extremely high. It is desired that the product 3 of the present invention is high.

  By forming it with the required thickness, size and porosity, it can be used immediately as a filter for kitchens or smokeless roasters, and by forming it with a small porosity, it can be used in a wide range of applications as a deodorizing filter. Can also be used.

  It is sectional explanatory drawing of the air-hole formation base which consists of a nonwoven fabric.   It is sectional explanatory drawing of the air-hole formation base which consists of a locking material.   It is application | coating explanatory drawing of a siloxane and silanol salt multimolecular-weight solution.   It is a section explanatory view of the product of the present invention.   It is a sketch of the product of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vent hole formation substrate 1A Vent hole formation substrate made of nonwoven fabric 1B Vent hole formation substrate made of lock material 1C Mineral fiber or glass fiber material 10B Heat resistant adhesive 2 Siloxane and silanol salt multimolecular weight solution 20 Inorganic foam 21 Vent hole 3 Invention

Claims (2)

  Use a very thin mineral fiber or glass fiber material with the required thickness and size, and apply the siloxane and silanol salt multi-molecular weight solution to the entire air-hole-forming substrate made of a non-woven fabric or lock material with a sufficiently large porosity. Ventilation base is formed by a silicon oxide inorganic foam which is applied at a volume ratio, heated at a temperature of at least 200 ° C. and foamed with a siloxane and silanol salt polymolecular weight solution at a foaming ratio of 5 to 20 times. A fireproof and incombustible filter characterized in that the outer peripheral surface of the fiber material to be formed is firmly encapsulated and the whole is integrally fixed, and the porosity is maintained and formed at a ratio of 30% or more.   Siloxane and silanol salt multi-molecular weight solution is applied to the entire air-hole forming substrate at a required volume ratio and heated at a high temperature of 600 to 900 ° C. to form a silicon oxide inorganic foam which is foamed. The fire-resistant and non-combustible filter according to claim 1, wherein the filter is layered.

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