JPH06155607A - Composite material for civil engineering - Google Patents

Abstract

(57) [Summary] [Purpose] A composite material for civil engineering, which has excellent oil resistance and flame retardancy and is used as a material for improving embankments or soft ground for buildings such as roads, bridges, stations, basements, runways and residential land development. Intended to provide material. [Composition] A civil engineering composite material comprising a thermosetting resin and a molded body containing expanded foamed vinylidene chloride resin particles as essential components.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a civil engineering composite material,
TECHNICAL FIELD The present invention relates to a civil engineering composite material used as a material for improving embankments or soft ground for buildings such as roads, bridges, stations, basements, runways and residential land development.

[0002]

2. Description of the Related Art A conventional embankment is composed of high density sand, earth and sand, gravel and concrete. They have a large earth pressure, which may cause a problem of ground subsidence due to a large load in the lower ground of the embankment, or a problem of landslide in which the lower part of the embankment spreads outward. In particular,
There were serious problems such as land subsidence and landslides in the embankment of soft ground, the embankment of steep slopes, and the embankment wall of the basement. In order to solve this problem, a lightweight embankment method (hereinafter referred to as EP) using an in-mold expanded polystyrene molding (hereinafter referred to as EPS) is used.
The S method is abbreviated). This method is to solve the problem by using lightweight foam instead of heavy soil and concrete.

The advantage of the EPS method is that its weight is 1/1 times that of earth and sand.
Since it is 00, the workability is light, the embankment load is small, the subsidence of the foundation ground is reduced, and the foam itself is self-supporting, so the lateral pressure can be reduced compared to the conventional construction method. The point is that there are few landslides. Because of its light weight, there is no need to strengthen the foundation ground, and it is also self-supporting, water resistant, and
It takes advantage of characteristics such as heat insulation and workability.

However, since EPS has low oil resistance, it cannot be maintained in the shape of the foam due to being attacked by oils such as gasoline, light oil, heavy oil, kerosene and the like. In addition, since it is flammable, care must be taken when handling fire, etc. at the construction site. Therefore, a protective wall such as a mortar, a wire mesh, and an asphalt sheet is provided to prevent the erosion of oils, but even if these are applied, peeling or cracks are likely to occur and it is difficult to prevent the erosion of oils.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned drawbacks of conventional products, and an object thereof is to provide a composite material for civil engineering which is excellent in oil resistance and flame retardancy.

[0006]

In order to solve the above-mentioned problems, the present inventors have proposed a thermosetting resin of a multi-foam type having excellent oil resistance, flame retardancy, compressive strength, bending strength and compression recovery. As a result of earnest studies on a material in which vinylidene chloride-based resin expanded particles are composited, the present invention has been completed. That is, the present invention relates to a civil engineering composite material comprising a thermosetting resin and a molded product containing expanded foamed vinylidene chloride resin particles as essential components.

In the present invention, as the thermosetting resin,
Known examples include epoxy resins, unsaturated polyester resins, polyurethane resins, silicone elastomers, phenol resins, melamine resins and the like. In the present invention, the foamed vinylidene chloride resin particles are foamed particles obtained by foaming beads obtained by impregnating an amorphous vinylidene chloride copolymer with a foaming agent. An amorphous vinylidene chloride copolymer is 10% by weight of vinylidene chloride.
As described above, the copolymer is 85% by weight or less, and the copolymerizable monomer is 15% by weight or more and 90% by weight or less. If the vinylidene chloride content is less than 10% by weight, the strength will be reduced. When it exceeds 85% by weight, the vinylidene chloride copolymer is
It becomes crystalline and the foamability decreases.

As copolymerizable monomers, acrylic acid esters such as vinyl chloride, (meth) acrylonitrile, styrene, α-methylstyrene and methyl acrylate, methacrylic acid esters such as methyl methacrylate, N-phenylmaleimide. Such as N-
Substituted maleimide and the like can be mentioned. You may use these individually or in combination of 2 or more types.

The vinylidene chloride copolymer may have a crosslinked structure. The crosslinked structure makes the foam rich in closed cells and improves the foam moldability. Examples of the crosslinking agent include divinylbenzene, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, ethylene glycol di (meth) acrylate, and propylene glycol di (meth) acrylate. You can

The polymerization can be carried out by any known method such as suspension polymerization, emulsion polymerization, solution polymerization and bulk polymerization. A known radical initiator can be used as the polymerization initiator. As for the impregnation method, a direct impregnation method in which the foaming agent is directly contacted with the beads in a gaseous or liquid state, or a suspension in water in which the foaming agent is added to the slurry liquid of the beads and impregnated by contacting in water And a polymerization impregnation method in which a foaming agent is added during polymerization to impregnate it.

Examples of the foaming agent include aliphatic hydrocarbons such as propane, butane, isobutane and pentane, chlorinated hydrocarbons such as methyl chloride, ethyl chloride and methylene chloride, monochlorodifluoroethane, trifluoroethane,
Difluoroethane, dichlorotrifluoroethane, 1,1-
Dichloro-1 fluoroethane, 2,2-dichloro-1,
Fluorinated hydrocarbons such as 1,1 trifluoroethane, 1,1,1,2-tetrafluoroethane and mixtures thereof can be used.

The above vinylidene chloride resin foamed particles are
For example, Japanese Patent Publication No. 63-33781 and Japanese Patent Publication No. 63-
It is described in JP-A-33782, JP-A-63-170435 and JP-A-2-199125. As a method for obtaining foamed particles, multi-foamed foamed particles can be easily obtained by heating resin particles containing a foaming agent with a heating medium such as steam, hot water or hot air. The heating conditions are selected according to the target expansion ratio. The expansion ratio of the expanded beads used is preferably 10 to 80 times. The particle size is adjusted by the particle size of the particles before foaming and the expansion ratio.

The composition ratio to be mixed is as follows: vinylidene chloride resin foamed particles 10 to 99% by weight, thermosetting resin 1 to
It is 90% by weight, and the ratio can be determined according to the required physical properties. Further, if necessary, a filler such as a reinforcing material, a flame retardant, a coloring agent, an extender, and a release agent may be added. Generally, as reinforcing material, powder of inorganic material such as glass fiber, acrylic resin, polypropylene, polyethylene, polyester, vinylon resin, vinylidene chloride resin or the like, calcium carbonate, magnesium carbonate, talc, silicon oxide, aluminum phosphate and the like. Is used. Examples of the flame-retardant material include antimony-based, phosphoric acid ester-based, halogen compounds, aluminum hydroxide, and other substances.

As a method for producing a molded article made of a composite material, vinylidene chloride resin foam particles and a thermosetting resin raw material are mixed, and a filler is also added if necessary. After thorough mixing, a mold suitable for the purpose is filled with this mixture and the thermosetting resin is cured to obtain a molded product. As another manufacturing method, vinylidene chloride resin particles before foaming are mixed with a thermosetting resin raw material, and a filler is also added if necessary. Next, a mold according to the purpose is filled with this mixture so as to have a target composite density, and the reaction heat at the time of thermosetting and the reaction heat and external heat are applied to obtain a molded body. You can also

When the composite obtained by molding is used in a place where strength is required, care must be taken so that no void is formed in the molded body. However, when it is used in places where the required level of strength is low, it is better to use the thermosetting resin as an adhesive agent for the expanded particles to form voids in the molded product rather than filling the voids between the expanded particles with the thermosetting resin. Is good.
Voids in the molded body have the advantage that the embankment has good drainage after construction.

The expanded vinylidene chloride resin particles used in the present invention have excellent oil resistance. It is very good for gasoline, kerosene, heavy oil, kerosene and machine oil, which are generally used in large amounts. When EPS comes into contact with each oil, the surface thereof starts to dissolve instantly, whereas the vinylidene chloride resin expanded particles hardly change. Therefore,
It is very suitable for locations where oil leaks are considered, and it is not necessary to take protective measures such as surrounding a light embankment with mortar, etc., as in the EPS method. Also, since an adhesive can be used, the step of integrating the foam with a special metal fitting can be omitted. Since it is not necessary to prepare special metal fittings, the wages can be reduced.

Since the vinylidene chloride resin used in the present invention has a lower water vapor transmission rate than EPS, it does not easily condense water in the foam even if it is left in that state for a long period of time, so that it can be used in places such as soft ground. Ideal for embankments. In addition, since it has excellent flame retardancy, it is not necessary to handle fires at the construction site. As mentioned above, the road,
It is used as a material for civil engineering such as embankments for buildings such as bridges, stations, basements, runways and residential land development, or as an improvement material for soft ground. Especially, because of its high oil resistance, there is a possibility of leakage of oils such as gasoline. It is suitable for general roads, racing roads, and airstrips for aircraft, as well as factory and gas station sites.

[0018]

The present invention will be described in detail with reference to the following examples.

[0019]

Example 1 50% by weight of a mixture of 100 parts by weight of an epoxy resin and 10.8 parts by weight of diethylenetriamine as a curing agent was mixed with 50% by weight of expanded foamed vinylidene chloride resin particles having an expansion ratio of 50 times. To do. Next, the mixture is filled in a predetermined mold, and the mold is heated by hot air having a temperature of 60 ° C. to cure the epoxy resin. After cooling the mold, the molded composite is taken out. The density of the complex is 1
It was 60 kg / m ³ . The molded body was bonded with the epoxy resin only between the expanded particles, and had a void. FIG. 1 shows a schematic diagram of the composite molded body.

FIG. 2 shows a schematic view of an embankment using the composite material for civil engineering of the present invention. First, the ground is dug down, and the composite of the present invention is laid on the leveled ground. Further, when the lightweight embankments are stacked on top of each other, the lightweight embankments are integrally bonded to each other by an adhesive in order to integrate the entire lightweight embankments. However, it is not necessary to bond all lightweight embankments when it is necessary to disperse the excess weight that acts after construction depending on the purpose of use of the embankment. After stacking lightweight embankments, the side walls will be constructed with embankments such as earth and sand.

[0021]

EFFECT OF THE INVENTION A civil engineering composite material comprising a composite molded body containing the thermosetting resin and expanded foamed vinylidene chloride resin particles of the present invention as essential components has excellent oil resistance and flame retardancy. Therefore, it can be used as an embankment for buildings such as roads, bridges, stations, basements, runways and residential land development, or as a composite material for civil engineering used for improving soft ground.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a civil engineering composite material of the present invention.

FIG. 2 is a schematic view of a construction example using the civil engineering composite material of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermosetting resin 2 Vinylidene chloride resin foam particles 3 Voids 4 Composite material of the present invention 5 Ground 6 Earth and sand 7 Asphalt

Claims (1)

[Claims] 1. A composite material for civil engineering, comprising a molded body containing a thermosetting resin and expanded foamed vinylidene chloride resin particles as essential components.