JP2000061220A - Sheet of paper for separator for air conditioner filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet of paper for separator for air conditioner filter, which can be made thin while keeping mechanical strength, water repellency, flame retardancy, heat resistance, and chemical resistance superior to those of a separator made of sepiolite paper, the pressure loss of which, when air passes through the air conditioner filter, is reduced to decrease the load on an air flowing blower or the like, and which is easily incinerated with a small incineration residue. SOLUTION: This sheet of paper is a sheet of paper 3 containing 10-50 wt.% cellulose fiber as solid current, 30-75 wt.% hydrate inorganic compound having >=20 wt.% crystallization water content, 2-10 wt.% amphoteric ion polymer bonding agent as solid content, 0.5-10 wt.% synthetic polymer base bonding agent of >=30 deg.C glass transition temp. as solid content, and 1-20 wt.% melamine phosphate base flame retardant as solid content and subjected to water repellent treatment. The breaking length obtained by averaging the data measured in the fiber orientation direction and the direction perpendicular to that (measured based on JIS P-8113) is >=1.0 km.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-conditioning filter separator sheet, and more specifically, it is more excellent in plastic workability such as corrugated shaping, and has mechanical strength, mechanical strength when wet, and water repellency. The present invention relates to a separator paper for an air-conditioning filter, which has excellent flame retardancy, heat resistance and chemical resistance, has little pressure loss when incorporated in an air-conditioning filter, and has little incineration residue.

[0002]

2. Description of the Related Art Air conditioning filters used in nuclear power plants and the like have mechanical strength, mechanical strength when wet, plastic workability such as corrugated shape shaping, water repellency, flame resistance, heat resistance and chemical resistance. It is required to have excellent properties and be inexpensive.
As a constituent material of such a filter, a glass fiber sheet or the like is used as a filter medium, and asbestos paper has been used as a separator inserted between the filter faces in order to maintain the distance between the filter faces of the filter medium. However, since air-conditioning filters that use a separator made of asbestos paper have a high risk of scattering harmful substances and are not preferable in terms of pollution prevention and work environment hygiene, recently sepiolite paper containing talc and sepiolite is used. Has been done.

[0003]

However, the air conditioning filter using the separator made of sepiolite paper is (1) The separator made of sepiolite paper maintains the required mechanical strength and mechanical strength when wet. However, as described in Japanese Utility Model Publication No. 6-30255, a thickness of about 0.26 to 0.30 mm is required. When such a thick separator is incorporated in an air-conditioning filter, pressure loss when air passes through the filter increases, and the load of an air circulation blower or the like increases. (2) When a separator made of aluminum foil or the like is used depending on the environment of use or the site of use because a separator having the required properties such as mechanical strength and mechanical strength when wet, and a thin thickness cannot be obtained. However, such aluminum foil separator is expensive and
Can not be incinerated after use. That is, it is difficult to incinerate because the aluminum foil melts at a high temperature and adheres to the incinerator and damages the incinerator, and it must be treated as industrial waste, and a considerable cost is required for that treatment. It costs. (3) In the case of a separator made of sepiolite paper,
After use, it will not damage the incinerator even if incinerated, but after incineration 60 to 70% of the weight before incineration
A large amount of incineration residue remains, which is not preferable for environmental protection measures. There were some difficulties.

The inventor of the present invention has made extensive studies to solve the above-mentioned problems, and as a result, a large amount of a specific hydrated inorganic compound is contained, and further, the cellulose fiber, the zwitterionic polymer binder and the glass transition point are 30 ° C. or more. A predetermined amount of synthetic polymer-based binder and a predetermined amount of melamine phosphate-based flame retardant and a water-repellent treated papermaking sheet having a predetermined tear length can be suitably used as a separator paper for an air conditioning filter, in particular. The point that the present inventor has taken into consideration is that the plastic workability is significantly improved as compared with the conventional sepiolite paper. And in the present invention, the separator made of such a papermaking sheet has sufficient safety without danger of scattering harmful substances, and has characteristics superior to the separator made of conventional sepiolite paper, that is, made of sepiolite paper. While maintaining mechanical strength superior to that of separators, mechanical strength when wet, plastic workability, water repellency, flame retardancy (in some cases equivalent), heat resistance and chemical resistance, it has been difficult until now. The thickness can be reduced to a thickness of 15 to less than 0.26 mm, the pressure loss when air passes through the air conditioning filter is reduced, and the load of the air circulation blower is reduced. It can be used as a substitute for foil separators and, in addition, it has less incineration residue and is easier to incinerate than conventional sepiolite paper separators. Thus although combine a good property, and completed the present invention discovered that you can at once eliminate the drawbacks of the conventional separator sheet mentioned above.

[0005]

The air-conditioning filter separator paper of the present invention comprises cellulose fibers in a solid content of 10 to 5.
0% by weight, 30 to 75% by weight of a water-containing inorganic compound having a water content of crystallization of 20% by weight or more, 2 to 10% by weight of a zwitterionic polymer binder as a solid content, and a glass transition point of 30.
A water-repellent papermaking sheet containing 0.5 to 10% by weight of a synthetic polymer binder at a temperature of ℃ or more in a solid content and 1 to 20% by weight of a melamine phosphate flame retardant in a solid content. The fiber has a breaking length (measured according to JIS P-8113) obtained by measuring the fiber orientation direction and the direction perpendicular to the fiber orientation direction and averaging the both, and is 1.0 km or more.

The air-conditioning filter separator paper of the present invention contains cellulose fiber in a solid content of 10 to 50% by weight.
And a hydrated inorganic compound having a water content of crystallization of 20% by weight or more, 30 to 75% by weight, a zwitterionic polymer binder in a solid content of 2 to 10% by weight, and a glass transition point of 30 ° C. or more. The polymer binder is 0.5 to 10% by weight in solid content,
Melamine phosphate-based flame retardant in solid content of 1 to 20% by weight,
A water-repellent papermaking sheet containing a small amount of glass fibers having a diameter of 4 μm or less, and the breaking length obtained by measuring the fiber orientation direction and the direction perpendicular to the fiber orientation direction and averaging the two (JIS P- Measurement based on 8113) is 1.0 km
The above is a feature.

As the above-mentioned cellulose fiber, one kind or two kinds selected from among wood pulp such as softwood-based or hardwood-based chemical pulp, mechanical pulp, semi-chemical pulp or the like wood pulp or cotton pulp, hemp pulp, various used papers, etc.
It may be used in combination with more than one kind. Wood pulp is the most easy-to-use cellulose fiber raw material because of its stable supply and quality and its relatively low price. The supply amount of cotton pulp and hemp pulp is unstable and the price is expensive. However, in the separator paper for air-conditioning filter containing a large amount of water-containing inorganic compound as in the present invention, the cotton pulp or hemp pulp may be used as necessary. By using, it is possible to minimize the deterioration of the mechanical strength of the separator paper and the mechanical strength when wet.

The content range of the cellulose fibers in the air-conditioning filter separator paper of the present invention is 10 to 50% by weight, preferably 20 to 45% by weight in terms of solid content. If the content is less than 10% by weight, sufficient mechanical strength and mechanical strength when wet cannot be obtained due to the insufficient amount of cellulose fibers, and if it exceeds 50% by weight, sufficient flame retardance due to an excess of organic substances. I can't get sex.

The water-containing inorganic compound used in the present invention must have a water content of crystallization of 20% by weight or more, preferably 30% by weight or more. When the content of water of crystallization is less than 20% by weight, the endothermic effect due to decomposition at the time of heating at a high temperature is small, the flame retarding effect is insufficient, and the weight reducing effect due to the elimination of water of crystallization is also insufficient.

Examples of the water-containing inorganic compound having a water content of crystallization of 20% by weight or more include aluminum hydroxide, magnesium hydroxide, calcium hydroxide, gypsum dihydrate and calcium aluminide. Each of these compounds has water of crystallization in the molecule and has a chemically similar structure. In addition, although the hydrous inorganic compound has a slight difference in decomposition temperature and endothermic amount depending on the type, it is decomposed when heated at high temperature and exhibits a flame retarding effect by an endothermic action, and also exhibits a weight reduction effect by desorption of crystal water. The points are quite common. Therefore, basically, any of the above-mentioned hydrous inorganic compounds may be used, but preferably 20 ° C.
It is desirable to select a water-containing inorganic compound that is sparingly soluble in the NHNO ₃ solution. Next, the reason will be described.

The separator paper for an air conditioning filter according to the present invention is required to have chemical resistance, particularly acid resistance,
Even after being immersed in the NHNO ₃ solution for 5 minutes, it must maintain a predetermined mechanical strength. Therefore, when the acid resistance of the above-mentioned hydrated inorganic compound to a 20 ° C. 5 NHNO ₃ solution was tested, aluminum hydroxide was poorly soluble, but magnesium hydroxide, calcium hydroxide, etc. were quite soluble, and in some cases foamed. It turns out that it may dissolve. And 20 ℃ 5NH
A papermaking sheet obtained by using a water-containing inorganic compound that is soluble in NO ₃ liquid has a temperature of 20 ° C 5NH compared to a papermaking sheet obtained by using a water-containing inorganic compound that is poorly soluble in a NO ₃ liquid.
It was found that the mechanical strength is likely to decrease when immersed in the NO ₃ solution. Therefore, in order to obtain air-conditioning filter separator paper with more excellent acid resistance, 20 ° C 5NHN
It is preferable to use a hydrous inorganic compound that is hardly soluble in the O ₃ liquid. Among them, it is most suitable to use aluminum hydroxide.

However, even if a water-containing inorganic compound that is soluble in a 20 ° C. 5N HNO ₃ solution is used, the papermaking sheet obtained by strengthening the water resistance treatment has a temperature of 20 ° C. 5N.
It has been confirmed in further experiments that the prescribed mechanical strength can be retained even after being immersed in the HNO ₃ solution for 5 minutes. Therefore, depending on the application, use a hydrous inorganic compound that is soluble in the 5NHNO ₃ solution at 20 ° C. It is judged that there is also a possibility.

The content range of the water-containing inorganic compound having a crystal water content of 20% by weight or more in the separator air-conditioning filter paper of the present invention is 30 to 75% by weight, preferably 35.
˜65% by weight. If the content is less than 30% by weight, sufficient flame retardancy cannot be obtained. On the other hand, when it exceeds 75% by weight, sufficient mechanical strength, mechanical strength when wet, and plastic workability cannot be obtained due to the excess amount of the water-containing inorganic compound, which is unsuitable.

The zwitterionic polymer binder used in the present invention has a high density of cationic and anionic functional groups at the particle interface, and is favorably adsorbed on fibers and fillers having a negative zeta potential in water. It has characteristics and has an effect of improving the mechanical strength of the sheet and the mechanical strength when wet.

The content range of the zwitterionic polymer binder in the air-conditioning filter separator paper of the present invention is 2 to solid content.
It is 10% by weight, preferably 3 to 8% by weight. If the content is less than 2% by weight, sufficient mechanical strength and wet mechanical strength cannot be obtained. On the other hand, when the content exceeds 10% by weight, the flame retardancy deteriorates due to the excess of organic substances, and
In the raw material slurry, aggregation is likely to occur due to the excess of zwitterionic polymer binder, and the papermaking sheet using such a raw material deteriorates in texture and mechanical strength and mechanical strength when wet There is.

The synthetic polymer binder having a glass transition point of 30 ° C. or higher used in the present invention has the effect of improving the mechanical strength and plastic workability of the sheet. The content range of the synthetic polymer binder having a glass transition point of 30 ° C. or higher in the separator sheet for an air conditioning filter of the present invention is 0.5 to 1 in terms of solid content.
It is 0% by weight, preferably 1 to 7% by weight. If the content is less than 0.5% by weight, sufficient mechanical strength and plastic workability cannot be obtained. On the other hand, when it exceeds 10% by weight, sufficient flame retardancy cannot be obtained due to the excess of organic substances.

The air-conditioning filter separator paper of the present invention must be water repellent. The water repellent treatment is not particularly limited, and various wax-based water repellents such as natural wax, petroleum wax, chlorinated paraffin, and wax emulsion, higher fatty acid derivatives, synthetic resins, chromium complex salts, zirconium salts, silicone resins, etc. The water repellency-imparting agent may be internally added, impregnated or applied.

The addition amount of the water repellency-imparting agent is not particularly limited, but what is important is that the water repellency of the sheet is required for the air conditioning filter separator, that is, preferably JIS P-. The amount of addition should be such that the water repellency of 8137 is about 6 or more.

Next, the reason why the predetermined amount of the melamine phosphate flame retardant is contained in the air-conditioning filter separator paper of the present invention will be explained. Before being incorporated in an air conditioning filter, the separator sheet for an air conditioning filter is usually passed through an engaging portion of an upper roll provided with a tooth profile having a V-shaped cross section as shown in FIG. Processed to shape the mold. However, in order to ensure the flame retardancy of the air-conditioning filter separator paper, it is necessary to increase the content of the hydrated inorganic compound, but if the content of the hydrated inorganic compound is increased, the strength of the sheet decreases, Plastic workability also tends to deteriorate. Therefore, it is common to use a flame retardant such as guanidine sulfamate or guanidine phosphate in order to secure sufficient flame retardancy without increasing the content of the water-containing inorganic compound extremely.

However, in this case, although the decrease in various strengths of the sheet can be suppressed to some extent, there is a problem that the plastic workability is further deteriorated. In the present invention,
As a result of diligent studies to solve such difficulties, by containing a predetermined amount of melamine phosphate flame retardant,
It was found that it is possible to obtain a separator paper for an air conditioning filter having a high degree of flame retardancy and excellent plastic workability such as corrugated shape shaping.

The content range of the melamine phosphate flame retardant in the separator air-conditioning filter paper of the present invention is 1 in terms of solid content.
-20% by weight, preferably 2-15% by weight. If the content is less than 1% by weight, sufficient flame retardancy cannot be obtained.
On the other hand, even if it exceeds 20% by weight, no further significant improvement in flame retardancy is observed, the paper quality becomes brittle, and bending processing such as corrugated shaping becomes difficult. Further, as the flame retardant in the air conditioning filter separator paper of the present invention, not only the single use of the melamine phosphate flame retardant, high flame retardancy, excellent mechanical strength, mechanical strength when wet, At least one of the flame retardants such as guanidine sulfamate and guanidine phosphate together with the melamine phosphate-based flame retardant is used in the range that the water repellency, heat resistance, chemical resistance, and plastic workability are compatible with each other without impairing the object of the present invention. The present invention also includes the case where the types are used in combination.

The air-conditioning filter separator paper of the present invention preferably contains a small amount of glass fibers having a diameter of 4 μm or less in order to improve the yield of the hydrous inorganic compound at the time of paper making described later. In this case, the content range of the glass fiber having a diameter of 4 μm or less in the air-conditioning filter separator paper is preferably 0.05 to 8% by weight in terms of solid content. When the content is less than 0.05% by weight, the effect of improving the water retention of the raw material slurry and the effect of improving the retention of the water-containing inorganic compound, which the present inventors have pointed out in Japanese Patent Publication No. 4-50437, are sufficient in the papermaking stage. Is less likely to be expressed in
Since a water-containing inorganic compound easily passes through the papermaking net and is easily washed away, a papermaking sheet containing a predetermined amount of a water-containing inorganic compound without using an organic retention aid or the like which adversely affects flame retardancy and formation. Can be difficult to obtain efficiently. On the other hand, when it exceeds 8% by weight, the water retention of the raw material slurry becomes excessive and the drainage from the paper making net deteriorates in the paper making stage, which may easily cause operational troubles. This tendency tends to become more noticeable by subjecting the cellulose fibers used together to a beating treatment or as the diameter of the glass fibers becomes smaller.

The breaking length (measured according to JIS P-8113) obtained by measuring the fiber orientation direction of the air-conditioning filter separator sheet of the present invention and the direction perpendicular to the fiber orientation direction is 1.0 km or more. There must be. When the breaking length is less than 1.0 km, the mechanical strength of the sheet per unit square meter and the mechanical strength when wet are weak, so a sheet required to obtain sufficient mechanical strength and mechanical strength when wet As a result, the sheet thickness becomes too thick, resulting in an increase in pressure loss when incorporated into a filter.

The air-conditioning filter separator paper of the present invention can be used in the conventional thickness, but the thickness is 0.1.
More preferably, it is less than 5 to 0.26 mm. The reason is that the thickness of separator paper for air conditioning filters is 0.15
If it is less than mm, mechanical strength, mechanical strength when wet, and plastic workability such as corrugated shape-forming property may be insufficient, and if it is 0.26 mm or more, when incorporated in a filter. This is because the pressure loss of 1 may increase easily. Further, the density of the separator paper for an air conditioning filter of the present invention is preferably 0.9 g / cm ³ or more.
If the density is less than 0.9 g / cm ³ , the mechanical strength of the sheet per unit thickness and the mechanical strength when wet tend to be weak, so that sufficient mechanical strength and mechanical strength when wet are obtained. The required thickness of the sheet may become excessive, and the pressure loss when incorporated in the air conditioning filter may easily increase.

The wet papermaking method is suitable as the method for producing the separator paper for an air conditioning filter of the present invention. Hereinafter, the manufacturing method will be described in more detail with reference to the manufacturing method. That is, in order to manufacture the separator paper for an air conditioning filter of the present invention, a predetermined amount of cellulose fiber, a water-containing inorganic compound having a water content of crystallization of 20% by weight or more, a zwitterionic polymer binder and, if necessary, a diameter of 4 μm. A raw material slurry containing the following glass fibers may be prepared and papermaking may be performed by a usual papermaking method. Then, the above-mentioned synthetic polymer binder having a glass transition point of 30 ° C. or higher, various water repellency-imparting agents and melamine phosphate flame retardant are internally added to the raw material slurry or impregnated or applied after forming a sheet. do it.

When a raw material slurry containing a large amount of inorganic powder as in the present invention is supplied to a papermaking net, usually in the process of sending the raw material slurry from the chest to the papermaking net,
Polyacrylamide-based, sodium polyacrylate-based, polyamine-based, polymethacrylic acid ester-based, dicyandiamide-based, polyethyleneimine-based, chitosan-based, cationized starch, etc. It is common practice to prevent the powder from flowing away from the paper making net to improve the yield, but in this case, the flocculation of the raw material slurry becomes remarkable due to the agglomeration action and the formation of the sheet deteriorates and the mechanical strength increases. Also, the mechanical strength when wet is apt to decrease. Therefore, when the separator sheet for an air-conditioning filter of the present invention is manufactured, it is preferable not to add a chemical agent exhibiting an aggregating action in the process of sending the raw material slurry from the chest to the paper making net. However, in this case, since the water-containing inorganic compound is easily washed away from the papermaking net in the papermaking process and the yield is liable to decrease, it is preferable to add glass fibers having a diameter of 4 μm or less to the raw material slurry to retain the water content of the raw material slurry. It is desirable to improve the properties and suppress the loss of the water-containing inorganic compound from the papermaking net to improve the yield. In this way, the formation of the sheet is maintained well, and the yield of the hydrated inorganic compound can be improved without lowering the mechanical strength and the mechanical strength when wet.

For the papermaking, the raw material slurry may be supplied onto a papermaking net such as an ordinary Fourdrinier, a cylinder or a slanted net, filtered, dehydrated, squeezed and dried. If desired, two or more paper layers may be laminated by using various combination nets, multi-tank nets or various laminators.
In addition, the squeezing condition should be as strong as possible to make the paper quality as close as possible to strengthen the fiber-to-fiber bond, and to improve the mechanical strength per unit square meter or the unit thickness and the mechanical strength when wet. It is easy to obtain a suitable separator sheet for the air conditioning filter.

Regarding the calendering after drying, the stronger the calendering is, the more the mechanical strength per unit thickness and the mechanical strength upon wetting are further improved, the surface becomes smooth, and when it is incorporated into a filter. However, if the calendering treatment is too strong, the plastic workability such as the corrugated shape-forming property may deteriorate. Therefore, it is necessary to appropriately determine the calendering conditions in consideration of both the mechanical strength per unit thickness, the mechanical strength when wet, and the plastic workability. Further, in the air conditioning filter separator paper of the present invention, if necessary, inorganic fibers such as rock wool fiber, ceramic fiber, various synthetic fibers such as nylon fiber, polyester fiber, polypropylene fiber, vinylon fiber, and synthetic dyes for coloring. Alternatively, a dry or wet paper strengthening agent, a sizing agent, a water resistant agent and the like may be contained.

[0029]

EXAMPLES Next, the present invention will be described more specifically based on the following examples. In this example, each item was measured by the following method. (1) Sheet Tsubos: JIS P-8124 (2) Sheet Thickness: JIS P-8118 (3) Sheet Density: JIS P-8118 (4) Sheet Tensile Strength: JIS P-8113 (However, The fiber orientation direction and the direction perpendicular to the fiber orientation direction were measured, and the average of the two was obtained.) (5) Breaking length of the sheet: (1) sheet sq.
(4) From the tensile strength of the sheet I asked for. (6) Wet tensile strength of sheet: Measured according to JIS P-8113 after immersion in distilled water at 20 ° C. for 15 minutes. (However, the fiber orientation direction and the direction perpendicular to the fiber orientation direction were measured, and the average of the two was obtained.) (7) Heat-resistant tensile strength: 121 ° C. 1 hour JI
It was measured by SP-8113. (However, the fiber orientation direction and the direction perpendicular to the fiber orientation direction were measured, and the average of both was determined.) (8) Acid tensile strength: Measured according to JIS P-8113 after immersion in a 5N HNO ₃ solution at 20 ° C for 5 minutes. (However, the fiber orientation direction and the direction perpendicular to the fiber orientation direction were measured, and the average of both was obtained.) (9) Flame retardancy: JIS L-1091 (10) Water repellency: JIS P-8137 (11) Strong Remaining heat amount: Obtained by the ash content of JIS P-8128. (12) Moisture: JIS P-8127 (13) Remaining amount of ignition per unit area: From the above-mentioned (1) rice tsubo, (11) remaining amount of ignition, (12) water content I asked for. (14) Plastic workability: 20 as shown in FIG.
A sheet having a width of 15 mm and a length of 80 mm was inserted into a V-shaped forming die having an opening angle of 60 degrees (5 seconds at an upper die own weight of 1.4 kg) at a temperature of 65 RH% and a humidity of 50 ° C., Immediately after leaving the shaped sheet so as to be convex upward on a horizontal plane,
The shaping height h ′ after 5 hours, 24 hours and 72 hours was measured.

As shown in FIG. 1, there is a certain amount of clearance in the meshing portion between the tooth profile of the upper roll and the tooth profile of the lower roll used in the actual corrugated shaping, and there is a certain amount of clearance between them. The deformation given to the sheet when passing the sheet through the interlocking part is not enough to make a crease clearly, so it is difficult to evaluate the aptitude for shaping except by actually passing it through a corrugated shaping machine. However, as a result of earnest trial and error, the imprinting height h measured by the above-described method
It has been found that there is a positive correlation with a correlation coefficient of 0.95 or more between ′ ′ and the corrugated shape shaping height h when it is passed through the actual corrugated shape shaping machine shown in FIG. Is. By the way, when the results showing the correlation between h and h ′ are illustrated, the measured values immediately after shaping of five types of papers having different plastic workability, and the shaping height h ′ measured by the above method is 1 respectively.
0.8mm, 12.5mm, 13.0mm, 15.4m
m and 18.5 mm, the corrugated shape forming height h when passing through the actual corrugated shape forming machine is 1.2.
It was 5 mm, 1.48 mm, 1.55 mm, 1.83 mm and 2.28 mm, and a very good positive correlation with a correlation coefficient of 0.999 was obtained.

Example 1 Commercially available softwood bleached sulfate pulp was disintegrated with a pulper,
Then, beat with a refiner, and the diameter is 0.65 μm.
4. A dispersion liquid of glass fiber (hereinafter, abbreviated as glass fiber α) was added and sufficiently stirred and mixed, and further aluminum hydroxide powder (water content of crystallization was 34.6% by weight, average particle diameter was 5.
It is 7 μm. same as below. ), A melamine phosphate-based flame retardant (having an average particle size of 2 to 5 μm, the same applies hereinafter), a wax emulsion-based water repellent, and an acrylic binder having a glass transition point of 63 ° C. (hereinafter, synthetic polymer-based binder). (Abbreviated as agent a)) and an SBR-based zwitterionic polymer binder, and sufficiently dispersed and mixed, and then papermaking and pressing with a multilayer cylinder paper machine,
Sheet A was obtained after drying and calendering. With respect to the sheet A, the content ratio of each component is shown in Table 1, and
Thickness, density, tensile strength, breaking length, wet tensile strength, heat resistant tensile strength, acid tensile strength, flame retardancy, water repellency, residual quantity of strong heat, moisture, residual quantity of strong heat per unit area and plastic workability Was measured, and the results are also shown in Table 1.

Example 2 Commercially available softwood bleached sulfate pulp was disintegrated with a pulper,
Next, it is beaten with a refiner, the dispersion of glass fiber α is added thereto, and the mixture is sufficiently stirred and mixed, and further, aluminum hydroxide powder and a styrene / acrylic binder having a glass transition point of 56 ° C. And a SBR-based zwitterionic polymer binder, and
After sufficiently dispersed and mixed, paper was made with a multi-layer cylinder paper machine, pressed, and then coated with an aqueous dispersion of a melamine phosphate flame retardant and a wax emulsion water repellent, dried and calendered to obtain a sheet B. . With respect to the sheet B, the content of each component is shown in Table 1, and the basis weight, thickness, density, tensile strength, breaking length, wet tensile strength, heat tensile strength, acid tensile strength, flame retardancy, water repellency, The residual quantity of ignition, water, residual quantity of ignition per unit area, and plastic workability were measured, and the results are also shown in Table 1.

Example 3 Sheet C was obtained in the same manner as in Example 1 except that the blending amount of each component was changed. With respect to the sheet C, the content of each component is shown in Table 1, and the weight of the rice, the thickness, the density, the tensile strength, the breaking length, the wet tensile strength, the heat-resistant tensile strength, the acid tensile strength, the flame retardancy, the water repellency, The residual quantity of ignition, water, residual quantity of ignition per unit area, and plastic workability were measured, and the results are also shown in Table 1.

Example 4 In Example 1, a glass fiber having a diameter of 3 μm (hereinafter abbreviated as glass fiber β) was used in place of the glass fiber α, and a glass transition point was used in place of the synthetic polymer binder a. Is 3
A sheet D was obtained in the same manner as in Example 1 except that an acrylic binder having a temperature of 5 ° C. (hereinafter, abbreviated as synthetic polymer binder c) was used. With respect to the sheet D, the content rate of each component is shown in Table 1, and the weight of the rice, the thickness, the density, the tensile strength,
Breaking length, wet tensile strength, heat resistant tensile strength, acid tensile strength,
Flame retardancy, water repellency, residual quantity of ignition, moisture, residual quantity of ignition per unit area and plastic workability were measured, and the results are shown in Table 1.
Are also shown.

Example 5 A sheet E was obtained in the same manner as in Example 2 except that the glass fiber α dispersion was not added. With respect to the sheet E, the content rate of each component is shown in Table 1, and
Thickness, density, tensile strength, breaking length, wet tensile strength, heat resistant tensile strength, acid tensile strength, flame retardancy, water repellency, residual quantity of strong heat, moisture, residual quantity of strong heat per unit area and plastic workability Was measured, and the results are also shown in Table 1. However, since glass fiber α was not added, the runoff of aluminum hydroxide from the papermaking net was increased, and the amount of aluminum hydroxide powder to be blended had to be doubled.

Comparative Example 1 A sheet F was obtained in the same manner as in Example 2 except that the wax emulsion water repellent was not added.
With respect to the sheet F, the content of each component is shown in Table 1, and the weight of the rice, the thickness, the density, the tensile strength, the breaking length, the wet tensile strength, the heat tensile strength, the acid tensile strength, the flame retardancy, the water repellency, The residual quantity of ignition, water, residual quantity of ignition per unit area, and plastic workability were measured, and the results are also shown in Table 1.

Comparative Example 2 A sheet G was obtained in the same manner as in Example 1 except that the melamine phosphate flame retardant was not added. With respect to the sheet G, the content of each component is shown in Table 1, and the weight of the rice, the thickness, the density, the tensile strength, the breaking length, the wet tensile strength, the heat-resistant tensile strength, the acid tensile strength, the flame retardancy, the water repellency, The residual quantity of ignition, water, residual quantity of ignition per unit area, and plastic workability were measured, and the results are also shown in Table 1.

Comparative Example 3 In Example 2, an acrylic binder having a glass transition point of −4 ° C. (hereinafter abbreviated as synthetic polymer binder d) was used instead of the synthetic polymer binder b. A sheet H was obtained in the same manner as in Example 2 except that a guanidine sulfamate flame retardant was used in place of the melamine phosphate flame retardant. With respect to the sheet H, the content of each component is shown in Table 1, and the weight of the rice, the thickness, the density, the tensile strength, the breaking length, the wet tensile strength, the heat tensile strength, the acid tensile strength, the flame retardancy, the water repellency, The residual quantity of ignition, water, residual quantity of ignition per unit area, and plastic workability were measured, and the results are also shown in Table 1.

Comparative Example 4 Regarding commercially available sepiolite paper currently used as a separator paper for air-conditioning filters, the weight per unit area, thickness, density, tensile strength, breaking length, wet tensile strength, heat-resistant tensile strength,
Acid tensile strength, flame retardancy, water repellency, residual quantity of ignition, moisture, residual quantity of ignition per unit area and plastic workability are measured,
The results are also shown in Table 1.

[0040]

[Table 1]

When the formations of the sheets A, B, C, D and E and the sepiolite paper of Comparative Example 4 are compared, the sepiolite paper is markedly flocked and some pinholes are observed. On the other hand, the sheets A, B, C, D and E are not so prominent in flocking of paper quality, and pinholes are not recognized at all. In addition, the asbestos paper that was previously used as separator paper for air-conditioning filters has a weight of 200-2
20 g / m ² , thickness 0.26-0.30 mm, density about 0.75 g / cm ³ , various strength, water repellency, flame retardancy and residual quantity of ignition are almost the same as sepiolite paper. Is.

[0042]

As can be seen from the above Examples 1 to 5, Comparative Examples 1 to 4 and Table 1, the air conditioning filter separator paper of the present invention is superior to the conventional air conditioning filter separator paper made of sepiolite paper. The breaking length is about 2.5 to 4 times, the paper quality is extremely excellent in mechanical strength, and the plastic workability and water repellency are superior to those of the conventional separator paper. The flammability is equivalent or higher. As described above, since the separator paper of the present invention is excellent in mechanical strength, the conventional separator paper requires a thickness of about 0.26 to 0.30 mm to satisfy the required mechanical strength. On the other hand, the separator paper for an air conditioning filter of the present invention has mechanical strength (tensile strength of about 3.0 times, wet tensile strength of about 3.0 times) of the conventional separator paper even at about 0.18 mm which is about 65% of the conventional thickness. 2.7 times, heat-resistant tensile strength about 3.4 times, acid resistance tensile strength about 3.0 times).

Further, Example 1 according to the present invention using a melamine phosphate flame retardant and a synthetic polymer binder having a glass transition point of 30 ° C. or higher, and the composition of each component is similar to Example 1,
Comparing Comparative Example 3 using a guanidine sulfamate flame retardant and a synthetic polymer binder having a glass transition point of less than 30 ° C., the imprinting height h ′ is Compared to Example 3, immediately after, 5 hours, 24 hours, and 72 hours later, 1.24
Doubled, 1.40 times, 1.45 times, and 1.46 times, and greatly improved in plastic workability, which is superior to conventional sepiolite paper.

Therefore, the separator paper for an air conditioning filter of the present invention has mechanical strength superior to that of conventional separator paper made of sepiolite paper, mechanical strength when wet, plastic workability, water repellency, and flame retardancy (in the case of equivalent). However, while maintaining heat resistance and chemical resistance, 0.15-
The thickness can be reduced to less than 0.26 mm, the pressure loss when air passes through the air conditioning filter can be significantly reduced, and the load on the air circulation blower or the like can be reduced.

On the other hand, if the thickness is made comparable to that of the conventional separator paper, it is possible to obtain much more excellent mechanical strength, mechanical strength when wet, and plastic workability, which is difficult with the conventional separator. It is possible to provide separator paper that can be used with high reliability even under such severe conditions.

In addition, the separator paper for air-conditioning filter of the present invention can reduce the residual quantity of high heat per unit area by about 40 to 70% as compared with the conventional separator paper made of sepiolite paper, that is, the separator is incinerated. The incineration residue at that time can be reduced substantially by 40 to 70% by weight, and the problem of environmental protection can be greatly improved.

Further, when a separator having a required thickness such as mechanical strength and mechanical strength when wet and a thin thickness could not be obtained, it is unavoidable that an aluminum foil separator or the like is used. However, the separator paper of the present invention can also be used as a substitute for such an aluminum foil separator. That is, it is not necessary to use an aluminum foil which is expensive and is difficult to incinerate because it is melted at a high temperature and adheres to the incinerator to damage the incinerator. Further, the air-conditioning filter separator paper of the present invention has sufficient safety without danger of scattering harmful substances, and is preferable in terms of pollution prevention and work environment hygiene.

[Brief description of drawings]

FIG. 1 is a depiction diagram showing a corrugated shape shaping processing state.

FIG. 2 is an explanatory diagram showing a method for measuring a shaping height h ′.

[Explanation of symbols]

1 upper roll 2 Lower roll 3 sheets 4 Corrugated sheet 5 Upper mold 6 Lower mold 7 sheets 8 Shaped sheet

Continued front page    F-term (reference) 4D019 AA01 BA04 BA06 BA12 BA13                       BA17 BA18 BB05 BC05 BC11                       BC12 BC13 BC20 BD01 CA02                 4D058 JA13 JA33 JA70 JB02 JB05                       JB13 JB14 JB18 JB26 JB41                       JB46 KA23 KA25 KA30 SA20                       TA02 UA13                 4L055 AF04 AF09 AG17 AG39 AG51                       AG63 AG71 AG76 AG97 AH01                       AH23 AH26 AH37 AH50 EA04                       EA07 EA08 EA16 EA20 EA32                       FA13 FA19 FA22 GA31 GA44

Claims (11)

[Claims] 1. A solid content of cellulose fibers of 10 to 50% by weight, a water-containing inorganic compound having a water of crystallization content of 20% by weight or more of 30 to 75% by weight, and an amphoteric ionic polymer binder as a solid content. 2 to 10% by weight, and 0.5 to 10% by weight of a synthetic polymer binder having a glass transition point of 30 ° C. or more in terms of solid content.
And 1 to 20% by weight of melamine phosphate flame retardant in solid content
Is a water-repellent treated papermaking sheet, and the breaking length (measured according to JISP-8113) obtained by measuring the fiber orientation direction and the direction perpendicular to the fiber orientation direction is 1.0 km. The separator paper for an air conditioning filter having the above characteristics. 2. Cellulose fibers are 10 to 50% by weight in solid content, 30 to 75% by weight of hydrous inorganic compound having a crystallization water content of 20% by weight or more, and zwitterionic polymer binder in solid content. 2 to 10% by weight, and 0.5 to 10% by weight of a synthetic polymer binder having a glass transition point of 30 ° C. or more in terms of solid content.
And 1 to 20% by weight of melamine phosphate flame retardant in solid content
And a water-repellent papermaking sheet containing a small amount of glass fibers having a diameter of 4 μm or less, and measuring the fiber orientation direction and the direction perpendicular to the fiber orientation direction, and obtaining the average of the two. (Measurement based on P-8113) is 1.0
Separator paper for an air conditioning filter, which is characterized by having a length of at least km. 3. The air-conditioning filter separator sheet according to claim 1, further having a thickness of 0.15 to 0.26 mm.
The separator paper for an air conditioning filter according to claim 1, wherein the separator paper is less than 1. 4. The air-conditioning filter separator sheet according to claim 2, further having a thickness of 0.15 to 0.26 mm.
3. The separator paper for an air conditioning filter according to claim 2, which is less than 3. 5. The air-conditioning filter separator sheet according to claim 1, further having a density of 0.9 g / cm.
The air-conditioning filter separator sheet according to claim 1 or 2, wherein the number is ³ or more. 6. The separator sheet for an air conditioning filter according to claim 2, further having a density of 0.9 g / cm.
The air-conditioning filter separator sheet according to claim 2 or 4, wherein the number of sheets is ³ or more. 7. The hydrous inorganic compound is 5 ° C.
_The separator paper for an air conditioning filter according to claim 1, 3 or 5, which is a water-containing inorganic compound that is poorly soluble in ₃ liquids. 8. The water-containing inorganic compound is 5NHNO at 20 ° C.
_The separator paper for an air conditioning filter according to claim 2, 4 or 6, which is a water-containing inorganic compound that is hardly soluble in ₃ liquids. 9. The separator paper for an air conditioning filter according to claim 1, 3, 5 or 7, wherein the hydrated inorganic compound is aluminum hydroxide. 10. The separator sheet for an air conditioning filter according to claim 2, 4, 6, or 8, wherein the hydrated inorganic compound is aluminum hydroxide. 11. The separator sheet for an air conditioning filter according to claim 2, wherein the content of the glass fiber having a diameter of 4 μm or less is 0.05 to 8% by weight.