JPS5925975Y2 - Resin concrete decorative lid - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a decorative lid made of resin concrete reinforced with a reinforcing material.

More specifically, it is lightweight, high strength, easy to handle, beautiful and durable, and is used as a cover for manholes, band holes, ditches, etc. buried underground in decoratively paved streets, passageways, parks, plazas, etc. This invention relates to a decorative lid made of low-shrinkage resin concrete that has excellent properties and is reinforced with a reinforcing material.

Conventionally, for the covers of manholes, bandholes, ditches, etc. on decoratively paved streets, passageways, parks, plazas, etc., instead of general-purpose cast iron covers, various kinds of stones and white colored stones were used in iron frames for the purpose of cosmetic effect. Alternatively, so-called terrazzo hammered iron decorative lids are used, which are made by filling a hardening composition such as terrazzo cement containing colored cement, curing it, and then polishing the surface.

Conventional terrazzo hammered iron decorative lids have low material strength of cement terrazzo and poor adhesion to the iron frame, so in order to obtain practical strength, the thickness of the iron frame and terrazzo hammering must be increased. This was necessary, and the weight was large, which caused a great deal of trouble in handling.

In addition, cracks tend to occur during use due to residual stress due to curing shrinkage of terrazzo and the brittleness of the material, and there are also drawbacks such as insufficient wear resistance.

Furthermore, in the manufacturing process that requires surface polishing after the terrazzo is implanted and hardened, it is difficult to add an uneven pattern to the terrazzo surface, and there are restrictions on imparting decorative effects and anti-slip properties using the uneven pattern.

The present invention is a decorative lid that solves the drawbacks of conventional terrazzo and iron decorative lids as described above, and is thin, lightweight, and
It has features such as high strength, high toughness, no cracks due to effective reinforcement, beautiful appearance, excellent wear resistance, and extremely long durability.

Furthermore, the decorative lid of the present invention can easily have an uneven pattern on its surface during the manufacturing process, and the uneven pattern can provide a decorative effect and anti-slip properties.

The decorative lid of the present invention is obtained by filling a mold with a curable composition whose main components are a low-shrinkage liquid thermosetting resin and an inorganic aggregate, and a reinforcing material, and then removing the mold from the mold. .

The formwork can be made of metal, wood, synthetic resin, or synthetic rubber, and may be coated with a known mold release agent for the purpose of improving demoldability and surface gloss of the product. can.

Examples of reinforcing agents used in the present invention include steel wires, steel rods, piano wires, PC steel wires, stainless steel wires, glass rods, glass fibers, steel plates, punched steel plates, wood plates, and wire mesh. From the point of view of the reinforcing effect, steel wire or punched steel plates are suitable, and punched steel plates with holes drilled at appropriate intervals in the steel plate are particularly suitable because they have good adhesion between the resin and the reinforcing material and can provide a high-strength decorative lid. It is.

Further, when using a punched steel plate, one piece can be used, but two or more pieces can also be used.

At this time, it is preferable that the punched steel plate has an individual thickness of 1 mm or more in the case of one punched steel plate, and a total thickness of 1 mm or more in the case of two or more punched steel plates.

The decorative lid of the present invention can be provided with a handle or recess of any shape for opening and closing.

For example, when filling the mold with the curable composition and reinforcing material, the handle can be placed in the mold in advance and embedded and molded as an integral part, or it can be attached after the decorative lid is molded. It can also be processed.

The low-shrinkage liquid thermosetting resin used in the present invention is a liquid thermosetting resin having a volume shrinkage of 3% or less, preferably 2% or less.

Specific examples include unsaturated epoxy resins or unsaturated polyester resins blended with epoxy resins and thermoplastic resins such as styrene polymers.

Here, it is preferable to add a thermoplastic resin dispersion stabilizer to the unsaturated epoxy resin or unsaturated polyester resin blended with a thermoplastic resin such as a styrene polymer in order to obtain a product with good surface gloss.

Examples of such dispersion stabilizers include JP-A-52-80
Examples include comb-shaped copolymers having a styrene polymer chain as a trunk and epoxy segments or polyester segments as branches, which are disclosed in Japanese Patent Application Laid-Open No. 58-74592.

Examples of the inorganic aggregate used in the present invention include ceramic powder, silica sand, river sand, cold water, etc., but ceramic powder is preferable when high wear resistance is required.

The amount of these inorganic aggregates used is 1 part of low-shrinkage thermosetting resin.
A suitable range is 100 to 1000 parts by weight, preferably 200 to 700 parts by weight.

The resin concrete decorative lid of the present invention may contain fillers such as calcium carbonate, talc, silica powder, mica, aluminum hydroxide, pigments, wax, etc., if necessary.

As mentioned above, the resin concrete decorative lid of the present invention is produced by filling the formwork with a curable composition containing a low-shrinkage liquid thermosetting resin and an inorganic aggregate as main components, and a reinforcing material. It is obtained by demolding, but because it uses a low-shrinkage resin, the adhesion between the resin and the reinforcing material after the resin has hardened is extremely high compared to when using ordinary liquid thermosetting resin. The reinforcing effect is excellent, and the curable composition does not peel off from the mold during the curing process, resulting in a decorative lid with a good and beautiful surface gloss.

In addition, the toughness and low shrinkage of the resin used as the material are
It prevents the occurrence of cracks during use that occur in conventional terrazzo hammered iron decorative lids, etc., and gives the product's decorative lids excellent durability.

In addition, the abrasion resistance of the resin and inorganic aggregate materials provides good abrasion resistance to the decorative lid of the product.

The resin concrete decorative lid of the present invention has many excellent effects as mentioned above, and can be used on decoratively paved streets, passageways, etc.
Suitable as covers for manholes, handholes, ditches, etc. in parks, plazas, etc.

Although the thickness can be arbitrarily selected depending on the application, it is generally desirable that it be 20 mm or more.

Hereinafter, the present invention will be specifically explained with reference to examples, but the present invention is not limited thereto.

In addition, all parts in the examples mean parts by weight unless otherwise specified.

Example Ortho unsaturated polyester resin (solid content 60%) 56
1 part, 25 parts of styrene monomer, 19 parts of polystyrene-styrene solution (solid content 30%), 2 parts of dispersion stabilizer Kuri Pearl R
-15 (manufactured by Kuraray Co., Ltd., a comb-shaped copolymer with a styrene polymer chain as a trunk and polyester segments as branches) 1 part, methyl ethyl ketone peroxide (55% solution) 1.2 parts, naphthenic acid copolymer) Solution (6%Co)0
, 3 parts, 50 parts of silica powder, ceramic powder (particle size 0.3-3
mm) and punched steel plates (length 295 mm, width 295 mm,
Two sheets with a thickness of 9.9 mm and aperture diameter of 1 (mm, porosity ratio of 50%) were placed at a height of 15 mm and 20 mm from the bottom of the form, measuring 3 QQ mm in length, 3 QQ mm in width, and 3 mm in depth. Nylon resin mold is injected into the mold, and the mold is vibrated at a frequency of 360.
3 on table vibrator with 0vPM, output 200WC
Compact by shaking for 2 minutes at room temperature of 22-27℃.
It was left to stand for 4 hours to harden.

After curing, the molded product was demolded to obtain a decorative lid made of low-shrinkage resin concrete reinforced with a reinforcing material.

The weight of the obtained decorative lid is 5.6 kg, which is lightweight, and the surface has a good gloss and is beautiful.

Bending failure load of this decorative lid (measurement conditions: JIS A-
5415.

The distance between the support rods was 20 cm, the surface of the decorative lid was placed facing upward, and the load applied to the center between the support rods was 1500 kg.

In addition, this decorative lid was immersed in hot water at 80°C for 1 hour, immediately placed in ice water at 0°C, and cooled for 1 hour for 50 cycles.
Although the process was repeated several times, no cracks or warping were observed.

56 parts of the above ortho-unsaturated polyester resin.

The volumetric shrinkage rate of the low shrinkage liquid thermosetting resin made of 25 parts of styrene monomer, 19 parts of polystyrene-styrene solution and 1 part of dispersion stabilizer upon curing was O0.3%.

Comparative example Ortho unsaturated polyester resin (solid content 60%) 10
0 parts, methyl ethyl ketone peroxide (55% solution)
1.2 parts, cobalt naphthenate solution (6% Co) 0.3
part, 50 parts of silica powder, ceramic powder (particle size 0.3 to 3 mm)
400 parts of the mixture was poured into the same mold with the same handle and reinforcing material as in the example, and cured under the same conditions to obtain a decorative lid made of resin concrete.

The obtained decorative lid had a concave warp on the top, the surface gloss was uneven, and the bending failure load was 790 kg.

Immerse this decorative lid in hot water at 80°C for 1 hour, then immediately bring it to 0°C.
When a cycle of placing the test piece in ice water and cooling it for 1 hour was repeated, the warpage increased as the test progressed, and cracks were observed on the surface and sides at the 7th cycle.

The volume shrinkage rate of the above-mentioned ortho-unsaturated polyester resin upon curing was 8%.

[Brief explanation of the drawing]

FIGS. 1 and 2 show an embodiment of the resin concrete decorative lid of the present invention, and are perspective views with a portion of the decorative lid cut away. 1 represents a low shrinkage thermosetting resin, 2 represents an inorganic aggregate, 3 represents a reinforcing material, and 4 represents a handle.

Claims (6)

[Scope of utility model registration request] (1) A decorative lid made of resin concrete whose main components are low-shrinkage thermosetting resin and inorganic aggregate, with reinforcing material arranged inside. (2) Practical use in which the low-shrinkage thermosetting resin is a cured product of a resin composition consisting of (a) an unsaturated polyester, (b) a monomer copolymerizable with (a), and (C) a styrene polymer. A decorative lid made of resin concrete as set forth in claim 1 of the patent registration claim. (3) The low-shrinkage thermosetting resin contains (a) an unsaturated polyester, (b) a monomer copolymerizable with (a), (C) a styrenic polymer, and (d) a styrenic polymer chain. The decorative lid made of resin conchnaut according to claim 1, which is a cured product of a resin composition comprising a comb-shaped copolymer having a trunk and polyester segments as branches. (4) The decorative lid made of resin concrete according to claim 1, wherein the composition ratio is in the range of 100 to 1000 parts by weight of the inorganic aggregate to 100 parts by weight of the low-shrinkage thermosetting resin. (5) The resin concrete decorative lid according to claim 1, wherein the reinforcing material is a punched steel plate. (6) The resin concrete decorative lid according to claim 1, wherein the decorative lid has a handle or a recess for opening and closing.