JP3174458B2 - Large septic tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-sized septic tank which is lightweight, resistant to collisions and excellent in durability. The present invention also relates to a large-sized, integrally formed, non-polluting septic tank that does not require fiber reinforcement, is recyclable, and does not generate harmful gases during incineration.

[0002]

2. Description of the Related Art Conventionally, many septic tanks are molded using fiber reinforced plastic (FRP). In particular, it is molded using an unsaturated polyester resin reinforced with glass fibers. When a septic tank is formed using the unsaturated polyester resin reinforced with glass fiber, a large amount of dust containing glass fiber is generated, and there is a problem that the working environment is deteriorated. In addition, such a septic tank using FRP has a large weight, and has a drawback that when it is dropped during transportation or struck by pebbles during construction, a crack is easily generated by the impact. Further, since the FRP molded article contains glass fibers, it is difficult to crush and pulverize it at the time of disposal, and even if it is incinerated, a large amount of glass fibers remains, and it takes time to process it.

[0003]

SUMMARY OF THE INVENTION It is, therefore, a first object of the present invention to provide a large-sized septic tank which eliminates various problems of the conventional septic tank using FRP. A second object of the present invention is to provide a large-sized septic tank which does not cause environmental problems in the production process and can be formed relatively easily by a reaction injection molding method. Third of the present invention
An object of the present invention is to provide a large-sized septic tank which is lightweight, has sufficient strength against impact, and can sufficiently withstand internal and external pressures after installation.

It is another object of the present invention to provide a large-sized septic tank assembled by connecting several individually molded parts efficiently and securely. It is still another object of the present invention to provide a large-sized septic tank in which a used resin molded article can be recycled and easily disposed. Still another object of the present invention is to provide a large-sized septic tank that can be advantageously used as a combined type septic tank.

[0005]

Means for Solving the Problems Some of the present inventors have conducted intensive studies in order to solve the object of the present invention, and as a result,
Using a cross-linked polymer molded product obtained by polymerizing and cross-linking a metathesis polymerizable cyclic olefin in a mold using a metathesis polymerization catalyst system (metathesis catalyst system), the upper tank portion and the lower It is a large purification layer that constitutes a tank part and, if necessary, an intermediate layer part.Each layer part has a structure that is joined via a flange. It has been found that by fixing with a chemical and a fastener, it is easy to manufacture, lighter in weight, resistant to impact, durable and pressure-resistant, and can provide a recyclable large septic tank. Suggested.

The present inventors have conducted research on the large-sized septic tank proposed above, which can withstand the internal and external pressures without increasing the thickness of the molded article by increasing the amount of the crosslinked polymer used. As a result, it has been found that the object can be achieved by providing a rod-shaped rib inside the tank and fixing the partition plate by the rod-shaped rib, and reached the present invention.

That is, according to the present invention, there is provided a large purification tank comprising an upper tank section and a lower tank section, or comprising an upper tank section, a lower tank section and an intermediate tank section of a plate-like band connecting them. The large septic tank comprises: (1) at least an upper tank portion and a lower tank portion each comprising a monomer liquid A (solution A) comprising a metathesis polymerizable cyclic olefin containing a catalyst component of a metathesis polymerization catalyst system; Is mixed with a monomer solution B (solution B) comprising a metathesis polymerizable cyclic olefin containing the activator component of the formula (1), and the raw material mixture is poured into a mold, and the polymerization and crosslinking reaction are performed in the mold. The crosslinked polymer molded article obtained, wherein (2) the upper tank, the lower tank, or the upper tank, the intermediate tank, and the lower tank via a flange provided at a portion to be joined to each other. Has a structure such that case, and (3) on the inside of each tank unit is provided a rod reinforcing ribs, has a structure as FRP resin partition plate is bonded through its ribs A large-sized septic tank is provided.

According to the present invention, the tank capacity is 2 m ³ or more, preferably ³ to 15 m ³ , particularly preferably 3 to 12 m 3.
A large septic tank of m ³ is provided.

Hereinafter, the present invention will be described more specifically. As the metathesis-polymerizable cyclic olefin for forming the crosslinked polymer constituting the septic tank of the present invention, those containing one to two metathesis-polymerizable cycloalkene groups in the molecule are used. Preferred are compounds having at least one norbornene skeleton in the molecule. Specific examples of these include dicyclopentadiene, tricyclopentadiene, cyclopentadiene-methylcyclopentadiene co-dimer, 5-ethylidene norbornene, norbornene, norbornadiene, 5-cyclohexenylnorbornene, 1,4,5,8-dimetano. -1,4,4a, 5,6,
7,8,8a-octahydronaphthalene, 1,4-methano-1,4,4a, 5,6,7,8,8a-octahydronaphthalene, 6-ethylidene-1,4,5,8-dimethano- One,
4,4a, 5,6,7,8,8a-octahydronaphthalene,
6-ethylidene-1,4,5,8-dimetano-1,4,4a,
5,6,7,8,8a-Heptahydronaphthalene, 1,4,
5,8-Dimethano-1,4,4a, 5,6,7,8,8a-hexahydronaphthalene, ethylenebis (5-norbornene), and the like, and a mixture thereof can also be used. In particular, dicyclopentadiene or a mixture containing 50 mol% or more, preferably 70 mol% or more thereof is suitably used.

[0010] If necessary, a metathesis polymerizable cyclic olefin having a polar group containing a different element such as oxygen or nitrogen can be used as a copolymer monomer. Such a copolymer monomer also preferably has a norbornene structural unit, and as a polar group, an ester group,
Preferred are an ether group, a cyano group, an N-substituted imide group, a halogen group and the like. Specific examples of such a copolymerized monomer include 5-methoxycarbonylnorbornene, 5- (2-
Ethylhexyloxy) carbonyl-5-methylnorbornene, 5-phenyloxymethylnorbornene, 5-cyanonorbornene, 6-cyano-1,4,5,8-dimethano-1,4,4a, 5,6,7,8 , 8a-octahydronaphthalene, N-butylnadecimide, 5-chloronorbornene, and the like.

The monomer solution A (solution A) of the present invention contains a catalyst component of a metathesis polymerization catalyst system. As such a catalyst component, salts such as halides of metals such as tungsten, rhenium, tantalum and molybdenum are used, and a tungsten compound is particularly preferable. As such a tungsten compound, tungsten hexahalide, tungsten oxyhalide and the like are preferable, and more specifically, tungsten hexachloride, tungsten oxychloride and the like are preferable. Further, an organic ammonium tungstate or the like can be used. It has been found that such a tungsten compound immediately starts cationic polymerization when added directly to a monomer, which is not preferable. Therefore, it is preferable that the tungsten compound is used by suspending it in an inert solvent such as benzene, toluene, chlorobenzene or the like in advance and solubilizing by adding a small amount of an alcohol compound and / or a phenol compound. Further, as described above, it is preferable to add about 1 to 5 mol of a Lewis base or a chelating agent to 1 mol of the tungsten compound in order to prevent undesired polymerization. Examples of such additives include acetylacetone, alkyl acetoacetates, tetrahydrofuran, and benzonitrile. When a polar monomer is used, as described above, the polar monomer itself may be a Lewis base, and in some cases, the compound may have its action without adding any of the above compounds. As described above, the monomer liquid A containing the catalyst component (solution A) has substantially sufficient stability.

On the other hand, the monomer solution B (solution B) of the present invention contains an activator component of a metathesis polymerization catalyst system. The activator-forming component is preferably an organometallic compound mainly composed of an alkylated metal of Group I to Group III of the periodic table, particularly a tetraalkyltin, alkylaluminum compound or alkylaluminum halide compound. Examples thereof include diethyl aluminum, ethyl aluminum dichloride, trioctyl aluminum, dioctyl aluminum iodide, and tetrabutyl tin. By dissolving the organometallic compound as an activator component in the monomer, a monomer liquid B (solution B) is formed.

Basically, a desired molded article of the crosslinked polymer can be obtained by mixing the solution A and the solution B and injecting the mixture into a mold. Is initiated so quickly that curing can occur while not sufficiently flowing into the mold, often causing problems. Therefore, it is preferable to use an activity regulator. As such regulators, Lewis bases are generally used, among others, ethers, esters,
Nitriles and the like are used. Specific examples include ethyl benzoate, butyl ether, diglyme and the like. Such a regulator is generally used by being added to the solution (solution B) of the component of the activator of the organometallic compound. When a monomer having a Lewis base is used as described above, it can also serve as a regulator.

The amount of the metathesis polymerization catalyst system used is, for example, when a tungsten compound is used as a catalyst component, the ratio of the tungsten compound to the raw material monomer is as follows:
It is about 1,000 to 1 to 15,000 to 1, preferably about 2,000 to 1, on a molar basis, and when the activator component is an alkyl aluminum, an aluminum compound based on the raw material monomer is used. Is from about 100: 1 to 10,000: 1 on a molar basis, preferably 20: 1.
A neighborhood of 0: 1 to 500: 1 is used. Further, as described above, the masking agent and the adjusting agent can be appropriately adjusted and used according to the amount of the catalyst system to be used by experiments.

The crosslinked polymer molded article of the present invention can be basically obtained by mixing the above solution A and solution B and injecting them into a mold. In this case, the catalytic activity of the metathesis catalyst system formed by mixing the solution A and the solution B can be represented by the time from when the two solutions are mixed to when the mixture loses fluidity. That is, if the time until the fluidity is lost is defined as the time from when both solutions are placed in a glass container equipped with a stirrer until the solution gels and entangles on the stirring shaft of the stirrer, the present invention is defined as follows. It is desirable that the solution A and the solution B lose the fluidity at 30 ° C. for a time of 1 to 120 seconds, preferably 2 to 100 seconds.

The molded article of the crosslinked polymer obtained by the present invention may further contain various additives according to the purpose in order to improve or maintain its properties in practical use. Such additives include fillers, pigments, antioxidants, light stabilizers, flame retardants, polymer improvers, and the like. Such an additive cannot be added after the crosslinked polymer of the present invention has been formed, so that it is necessary to add the additive to the above-described raw material solution beforehand.

The easiest method is to use the solution A
And a method in which it is added in advance to one or both of solution B, but in this case, it does not react practically with a strongly reactive catalyst component or activator component in the solution. And must not inhibit polymerization. In the case where the polymerization does not substantially inhibit the polymerization even if the reaction is unavoidable, the third liquid can be prepared by mixing with the monomer and used immediately before the polymerization. Further, a third solution containing a polymerization catalyst or an activator, and a solution A or a solution B containing no third solution.
It is also conceivable to add the above additives to the mixture. Further, in the case of a solid filler, in the case where both components are mixed and the shape is such that the voids can be sufficiently filled immediately before the start of the polymerization reaction or during the polymerization, the filler is filled in the mold. It is also possible to keep. Reinforcing agents or fillers as additives are effective in improving flexural modulus. Such materials include glass fibers, mica, carbon black, wollastonite and the like. Those surface-treated with a so-called silane coupler or the like can be suitably used.

It is preferable that an antioxidant is added to the molded article according to the present invention. Therefore, it is desirable to add a phenol or amine antioxidant to the solution in advance. Specific examples of these antioxidants include 2,6-di-t-butyl-p-cresol, N, N ′
-Diphenyl-p-phenylenediamine, tetrakis [methylene (3,5-di-t-butyl-4-hydroxycinnamate)] methane and the like.

The molded article of the present invention can be obtained by adding another polymer in a monomer solution state at the time of molding. As such a polymer additive, the addition of an elastomer is effective in increasing the impact resistance of the molded product and adjusting the viscosity of the solution. Elastomers used for such purposes include styrene-butadiene-styrene triblock rubber, styrene-isoprene-styrene triblock rubber, polybutadiene, polyisoprene,
A wide range of elastomers can be mentioned, such as butyl rubber, ethylene propylene-diene terpolymer, and nitrile rubber.

Examples of the material of the mold for forming the septic tank of the present invention include steel, cast or forged aluminum or zinc alloy, and spraying, electroforming such as nickel and copper, and resin. In addition, the structure of the mold is simple enough because the pressure generated in the mold during molding is several kg / cm ² , which is extremely low as compared with other molding methods. Can be made.

One of the features of the cyclic olefin crosslinked polymer molded article of the present invention is that it has excellent impact resistance, and it is not easily broken even when dropped or when a solid such as pebbles collides. . Further, the molded article of the present invention basically does not need to particularly use a reinforcing material such as glass fiber. Therefore, the flexural modulus is generally lower than those using these reinforcing materials. Some of the present inventors have already proposed as a means for solving this problem that a shape having a concave and convex rib having a specific structure is effective for a large-sized septic tank (Japanese Patent Application No. 5-2850).
No. 97; filed on November 15, 1993). The large septic tank proposed above is a large septic tank composed of an upper tank section and a lower tank section or an upper tank section, a lower tank section, and an intermediate tank section of a plate-like band connecting them. The large septic tank is (1) a cross-linked polymer molded article of the cyclic olefin, and (2) at least the upper tank section and the lower tank section have rectangular uneven ribs in the vertical direction, and the uneven ribs are located laterally of the septic tank. 1.5 per m on average for the width in the direction
(3) each of the uneven ribs has the following shape characteristics (i) to (iv) (i) 10 ≦ H ≦ 50 (ii) 30 ≦ W ≦ 200 (iii) 2 ≦ R <H, 2 ≦ R ′ <H (iv) 3 ≦ t [where t represents the average thickness of the molded product in a cross section perpendicular to the length direction of the uneven ribs, and H represents the height of the projection from the surface of the molded product. , W indicate the width of the uneven portion, and R and R 'indicate the radius of the bent portion of the uneven portion, respectively. The units of t, H, W, R and R 'are expressed in millimeters (mm). ] Is satisfied. The cross-sectional shape of the concave and convex rib is shown in FIG. 4, and t, H, W, R and R 'are as shown in FIG. The large-sized septic tank of the present invention can have such uneven ribs, and it is more preferable. In the case where an intermediate tank is provided, the intermediate tank may have a similar uneven rib.

Next, the structure of the large-sized septic tank of the present invention will be described with reference to the drawings. The large-sized septic tank of the present invention is basically composed of two or three members. That is, it is composed of two members, an upper tank part and a lower tank part, or is composed of three parts, an upper tank part, a lower tank part and an intermediate tank part of a plate-like band connecting them.

FIG. 1 shows an example of a large-sized septic tank according to the present invention, in which A is a front view and B is a side view. In FIG. 1, 1 is an upper tank and 4 is a lower tank.
In FIG. 1, the upper tank 1 and the lower tank 4 are fixed by flanges 3 and 3 '. Further, the upper tank section 1 and the lower tank section 4 may be fixed by an intermediate tank section of a plate-like band connecting them. This intermediate tank section is not shown in FIG.
The intermediate tank section is fixed firmly between the upper tank section and the lower tank section usually through a flange. By providing this intermediate tank portion, a purification tank having an increased internal volume can be obtained. Also, in the large-sized septic tank shown in FIG. 1, concave and convex ribs 2 and 2 ′ are provided in the upper tank part and the lower tank part, respectively (the number of concave and convex ribs is four in the front view and in the side view in FIG. 1). Two).

In the large-sized septic tank of the present invention, at least the upper tank section and the lower tank section are molded articles of the crosslinked polymer of the metathesis polymerizable cyclic olefin described above, preferably the upper tank section,
All of the lower tank section and the intermediate tank section are molded articles of this crosslinked polymer. Each of these upper tank part, lower tank part and intermediate tank part is also characterized in that it is an integrally molded product.

Once installed, the septic tank is used for a long period of time of 10 to 20 years or more. Since water enters the septic tank, water pressure is applied to the inside of the tank. Strictness is also required for durability and heat resistance, for example, pressure is always applied.

In order to meet such strict requirements, a method for improving the strength of the upper tank section and the lower tank section, or the intermediate tank section of the plate-shaped strip connecting them, and the upper tank section and the lower tank section described below has been intensively studied. .

The most commonly considered method of improving the strength is to increase the thickness of the molded product. However, in this method, the weight of each tank portion is increased, so that not only the septic tank is heavy and the handling is not easy, but also the cost increases because more raw material is used.

As another method of obtaining a large strength while suppressing an increase in weight, there is a method of erecting a rod-like rib without changing the thickness of a molded product. Therefore, some of the present inventors obtained a molded product by erecting a rod-like rib at an appropriate position in each tank portion, and the crosslinked polymer of the present invention is the most frequently used F in the market.
Compared with RP, it is a material with low rigidity and lightness, so it was extremely strong against impact and showed high fracture resistance, but it was found that deformation was large when an internal or external pressure was applied.

[0029] Therefore, the present inventors have studying the structure of the septic tank having a further higher rigidity with the molded article having a rod-like rib. As a result, it became possible to obtain sufficient rigidity by firmly fixing a partition plate and a rod-like rib, which are divided into different functions such as an anaerobic tank, an aerobic tank, and a disinfecting tank, inside the septic tank. The partition plate and the rod-shaped ribs are fixed by using bolts and nuts, an adhesive, or a combination of both. The partition plate material material rather preferred to have a sufficient rigidity, F R
P resin is not preferable.

FIG. 2 shows an example of a cross section of a reinforcing rod-like rib 10 provided inside the large-sized septic tank of the present invention. The rod-shaped ribs are integrally formed on the insides of the tanks, for example, at positions 5 and 5 'in FIG. FIG. 3 shows an example of a fixing method with the partition plate 6. That is, using the rod-shaped rib 10, the FRP partition plate 6 for dividing the anaerobic tank, the aerobic tank, the disinfecting tank, and the like, and the tank parts of the purification tank are fixed using bolts, nuts, and adhesives.

Although the inside of the septic tank of the present invention is not shown, it has basically the same structure as that of a normal septic tank, and is divided according to each function such as an anaerobic tank, an aerobic tank and a disinfecting tank. Is filled with various members for purifying waste water efficiently, and a flowing water channel is provided. The large septic tank of the present invention can be used as a single tank for collecting night soil, or as a combined septic tank for purifying both night soil and domestic wastewater.

[0032]

The present invention will be described below with reference to examples. It should be noted that the examples are for explanation, and the present invention is not limited to these. The template and monomer liquid used in the examples were as follows.

(1) Mold An aluminum mold incorporating the product shape shown in FIG. 1 was used. The dimensions of the septic tank in the examples were as follows. C = 2260 mm D = 950 mm E = 800 mm F = 1140 mm FIG. 2 shows a cross-sectional view of the bar-shaped rib engraved in the aluminum mold. The dimensions of the bar-shaped rib in the examples are as follows. G = 10mm K = 4.5mm J = 40mm

(Preparation of monomer solution) (Preparation of solution A) 20 parts by weight of tungsten hexachloride was added to 70 parts by weight of dry toluene under a nitrogen stream, and then a solution consisting of 2 parts by weight of nonylphenol and 16 parts by weight of toluene was added. To prepare a 0.5M tungsten-containing catalyst solution, and purging the solution with nitrogen gas overnight to remove the hydrogen chloride gas generated by the reaction between tungsten hexachloride and nonylphenol, and further prepare the solution 10 One part by volume of acetylacetone was added to the part by volume to prepare a polymerization catalyst.

Next, a monomer mixture consisting of 95 parts by weight of purified dicyclopentadiene (purity: 99.7% by weight, the same applies hereinafter) and 5 parts by weight of purified ethylidene norbornene (purity: 99.5% by weight, the same applies hereinafter) was mixed with ethylene containing 70
3% by weight of an ethylene-propylene-ethylidene norbornene polymerized rubber in mole%, and Ethanox 7 as an oxidation stabilizer
To the solution to which 022 parts by weight were added, the above-mentioned catalyst solution for polymerization was added so that the tungsten content was 0.01 / liter, to prepare a monomer solution A containing a catalyst component (solution A).

[Preparation of Solution B] A mixed solution of activator for polymerization prepared by mixing and mixing 85 parts of trioctylaluminum, 15 parts of dioctylaluminum iodide and 100 parts of diglyme was mixed with 95 parts by weight of purified dicyclopentadiene and 5 parts by weight of purified ethylidene norbornene. Part, ethylene content 70
A monomer liquid B (solution B) containing an activator component was mixed with a monomer mixture consisting of 3 parts by weight of an ethylene-propylene-ethylidene norbornene polymerized rubber in an amount of 0.03 mol / l. Was prepared. Solution B had a viscosity of 300 cps at 30 ° C.

[Molding] An aluminum mold for molding is heated to a cavity mold of 90 ° C. and a core mold of 60 ° C. to close the mold. Then, an equal amount of the solution A is mixed into the mixing head using a RIM molding machine. Solution B was impact mixed and injected. The mold was opened two minutes after the liquid injection and filling, and the crosslinked polymer molded article was taken out 3.5 minutes later.

[Evaluation as a Septic Tank] Three FRP partition plates were fixed with bolts, nuts and an adhesive using the rod-like ribs inside the lower tank of the obtained crosslinked polymer molded product. The upper tank of the crosslinked polymer molded product was covered thereover, and the upper and lower tanks were fixed with bolts, nuts, and an adhesive via a flange portion to obtain an evaluation product. The product satisfied both the rigidity test and the durability test based on JIS A4101.

[0039]

According to the present invention, there is provided a large-sized septic tank which can be easily molded, is lightweight, is strong against impact, can sufficiently withstand internal and external pressures, has durability, is easy to assemble, and can be recycled. You.

[Brief description of the drawings]

FIG. 1 shows an example of a large-sized septic tank according to the present invention, wherein A is a front view and B is a side view.

FIG. 2 shows an example of a cross-sectional view of a rod-like rib integrally formed inside the large-sized septic tank of the present invention.

FIG. 3 shows an example of a method for fixing a rod-shaped rib and a partition plate in a large-sized septic tank according to the present invention.

FIG. 4 is a cross-sectional view of a concave and convex rib in the large-sized septic tank of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Septic tank upper tank part 2, 2 'Irregular rib 3, 3' flange 4 Septic tank lower tank part 5, 5 Position of rod-shaped rib provided inside each tank part 6 Partition plate 7 Adhesive agent 8 Bolt 9 Nut 10 Rod-shaped rib

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Katsuichi Hemi 2-1 Hinodemachi, Iwakuni-shi, Yamaguchi Prefecture Teijin Meton Co., Ltd. Technical Center (56) References JP-A-3-115322 (JP, A) JP-A-2-239915 (JP, A) JP-A-7-290484 (JP, A) JP-A-7-137070 (JP, A) Japanese Utility Model 3-54798 (JP, U) (58) Fields surveyed (Int .Cl. ⁷ , DB name) B29C 45/00-45/84 C02F 3/00-3/04

Claims (2)

(57) [Claims] 1. A large-sized septic tank comprising an upper tank section and a lower tank section or an upper tank section, a lower tank section, and an intermediate tank section of a plate-like band connecting them. (1) At least the upper tank part and the lower tank part contain a monomer liquid A (solution A) comprising a metathesis polymerizable cyclic olefin containing a metathesis polymerization catalyst system catalyst component and a metathesis polymerization catalyst system activator component. Monomer liquid B comprising a metathesis polymerizable cyclic olefin (solution B)
And a mixture of the raw materials is poured into a mold and polymerized and cross-linked in the mold to obtain a crosslinked polymer molded article, wherein (2) an upper tank section and a lower tank section Alternatively, the upper tank section, the intermediate tank section, and the lower tank section have a structure in which the upper tank section, the lower tank section, and the lower tank section are joined to each other through a flange provided at a joining section. A bar-shaped rib is provided, and an FRP tree is
A large-sized septic tank having a structure in which fat-made partition plates are combined. 2. An apparatus comprising an upper tank part and a lower tank part.
Or in the upper and lower tanks and the plate band connecting them
A large-sized septic tank comprising an intermediate tank section,
The tank is: (1) At least the upper and lower tanks are
Metathesis polymerizability containing catalyst component of cis polymerization catalyst system
Monomer liquid A (solution A) composed of cyclic olefin and meta
Metathesis containing activator component of the thesis polymerization catalyst system
Monomer liquid B comprising polymerizable cyclic olefin (solution B)
And mix the raw material mixture into a mold,
Polymerisation and cross-linking reactions within
And (2) an upper tank part and
The lower tank, or the upper tank, the intermediate tank, and the lower tank,
Joining through the flange provided at the part to be joined
And (3) inside each tank section
Is provided with reinforcing rod-like ribs, and FRP
Fat dividers use bolts and nuts and adhesive
A large-sized cleaning device having a structure for coupling.
Chemical tank.