JPS61178461A - Fiber reinformed product - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fiber-reinforced product, and more particularly, to a fiber-reinforced product that has excellent weather resistance, fire resistance, water resistance, and oil resistance.

[Conventional technology]

Fiber-reinforced products are made by hardening fibers as reinforcing materials with a binding material, and conventionally, most of them are plastic concrete, that is, fiber-reinforced plastic called FRP. However, since FRP uses synthetic resins such as unsaturated polyester resins, epoxy resins, and vinyl ester resins as binding materials, it is subject to significant deterioration due to ultraviolet rays and seawater spray, and is inferior in durability. In addition to the problem of poor quality, it also has the disadvantage that various solvents are used during manufacturing, which can have an adverse effect on the human body. On the other hand, in terms of fire resistance and deterioration,
It is being considered to use cement as a binding material instead of synthetic resin. However, with conventional general cement,
It has been impossible to use fiber-reinforced cement products in fields where FRP products have traditionally been used due to their high water permeability, low strength, powdery appearance, and inability to produce thin-walled products.

[Problem that the invention seeks to solve]

As a result of our earnest efforts to solve the above-mentioned problems with conventional fiber-reinforced products, the inventors of the present invention have succeeded in creating a hardened cement product with high strength and strength that was previously unobtainable, while using an inexpensive cement system.
The present invention was completed based on the knowledge that fiber-reinforced products with high density, excellent fire resistance, weather resistance, and durability can be obtained.

[Means to solve problems]

That is, the present invention is a fiber-reinforced product characterized by comprising a hydraulic binder whose main components are cement, ultrafine powder, and a high-performance water reducing agent, and a fibrous reinforcing material.

The present invention will be explained in detail below.

As the cement, ordinary, early-strength, ultra-early-strength and white Portland cements are commonly used. In addition, various types of low heat generation cements such as moderate heat and mass concrete, various mixed cements such as fly ash and blast furnace slag, rapid hardening cements with rapid hardening properties, and expansion cements with expandability can also be used.

The ultrafine powder is a powder with an average particle size of 1 μm or less, and although there are no particular restrictions on its composition, those easily soluble in water are not suitable. In the present invention, silica dust (silica fume) and siliceous dust, which are by-products during the production of silicon, silicon-containing alloys, and zirconia, are particularly suitable, including fly ash, calcium carbonate, silica gel, ono? - Crushed rock, titanium oxide, aluminum oxide, etc. can also be used.

The amount of ultrafine/powder used is 3 to 5 parts per 100 parts by weight of cement.
0 parts by weight, preferably 5 to 40 parts by weight. If the amount exceeds 50 parts by weight, the fluidity of the kneaded product will be markedly reduced, making it difficult to mold and developing insufficient strength. If it is less than 3 parts by weight, the effect of ultrafine powder cannot be expected.

A high-performance water reducer is a surfactant that has good dispersion ability even when added to cement in large amounts without causing too much delay in setting or excessive air entrainment. Specific examples include salts of melamine sulfonic acid formaldehyde condensed metals, salts of naphthalic acid formaldehyde condensed metals, high molecular weight lignin sulfonates, polycarboxylic acid salts, and the like as main components. The standard amount of the high performance water reducing agent used is 0.3 to 1 part by weight as a solid content per 100 parts by weight of cement, but in the present invention it is desirable to add even larger amounts. In the present invention, at most 100 parts by weight of cement
Although the amount is limited to 0 parts by weight, the preferred usage amount is 2 to 5 parts by weight. A high-performance water reducing agent is essential in order to obtain a mixed material with a low water-to-cement ratio, and if it exceeds 10 parts by weight, the water reducing effect will not match the increase in the amount added, and will instead have an adverse effect on hardening.

Aggregates used in general concrete can be used, such as river sand, river gravel, mountain sand, mountain gravel, crushed sand, crushed stone, sea sand, etc. However, clay, silt, Clean aggregate that does not contain organic impurities is desirable. moreover,
In order to obtain higher strength products, harder aggregates, i.e.
A material selected based on either a Mohs hardness of 6 or more, preferably 7 or more, or a Knoop indenter hardness of 700 Kq/yA or more is used. Examples of materials that meet this standard include crushed stone, pyrite, hematite, magnetite, pyrite, roanite,
Corundum, 7-enacite, spinel, beryl, full curb stone, tourmaline, granite, andalusite, cross stone, zircon, calcined dexide, boron carbide, tungsten carbide, ferrosilicon nitride, silicon nitride, cubic boron nitride, fused silica , fused magnesia, silicon carbide, etc.

Among these, nitrides and the like are particularly preferred because they react with alkali to increase the adhesive strength at the interface between the hydraulic binder and the aggregate, resulting in high strength and excellent abrasion resistance.

The water used when kneading the hydraulic binder using the material containing the above composition is not limited in terms of its components, and may be any water that does not adversely affect the hardening of the cement. The amount of water used is 10 to 30 parts by weight per 100 parts by weight of cement and ultrafine powder.
It is preferably 15 to 25 parts by weight.

Next, fibers as reinforcing materials will be explained.

The fibers used include alkali-resistant glass fibers, steel fibers, asbestos, carbon fibers, alumina fibers, amide fibers, polyethylene fibers, polypropylene fibers, and vinylon fibers. or,
Its shape is short fiber (chopped strand),
Roving, chopped strand mat, tape, cloth, roving cloth Sur-7 Eshisig mat, etc. are used.

Fabrication of fiber reinforced products using the material of the invention can be carried out in the following manner. That is, the hand lay-up method, in which the cut reinforcing material and the hydraulic binder are alternately laminated on the mold surface, thoroughly impregnated and defoamed, cured, and released from the mold to obtain the product; The spray-up method involves spraying a hydraulic binder onto the mold surface, the filament winding method involves wrapping a roving reinforcing material impregnated with a hydraulic binder around a winding core, and the filament winding method involves spraying a reinforcing material and a hydraulic binder onto a core. There are two methods: the bag method, in which the material is placed in a covered mold, and the air is forced out by applying reduced pressure from the inside of the mold or external pressure is applied, and the injection molding method, in which the material is injected into a reinforcing material, and other pouring methods. , centrifugal molding method, continuous molding method, pultrusion molding method, etc.

〔Example〕

Hereinafter, a more detailed explanation will be given with reference to examples.

Example 1 The formulations shown in Table 1 Experiment Nα2, Nα4 to 10 were adjusted,
Molding was performed using a pouring method, a spray-up method, a pour-lay-up method, a press molding method, and a filament winding method. After molding, it was cured for one week in a room at 20° C. and 85% RH, and then cut using a diamond cutter.

Also, when cutting, if there is a possibility that the fibers may become uneven, discard the peripheral part 5crn and cut 25X5X from the inner part.
A 1 m test piece was cut out. The test specimen was heated to 20℃85% again.
The test materials were cured in the RH room until the 28th day of age, and then subjected to bending tests and tensile tests. The results are also listed in Table-1.

Comparative Example Table 1 Experiment Nos. 1 and 3 were carried out in the same manner as in Example 1, except that the formulations in Experiments 1 and 3 were used. The results are shown in Table-1.

Materials used> Q Cement: Denki Kagaku Kogyo Co., Ltd. Ordinary Portland cement iμ) O Water reducing agent: High performance water reducing agent: Denki Kagaku Kogyo Co., Ltd. Product name r FT-500J (Main component: salt of alkylnaphthalene sulfonic acid formaldehyde condensate) (Used in terms of solid content) ) O aggregate...... Crushed sand 2.5 yen ○ Fiber Glass fiber... Alkali-resistant glass (manufactured by Asahi Fiber Glass) Carbon fiber... Nippon Kargan Manufactured by Sango Co., Ltd., product name "TESUSA" fiber length 20, fiber length 20, fiber length 20 Example 2 Example 1 Heat resistance, fire resistance, weather resistance, and abrasion resistance tests were conducted on the molded product of Experiment 1 @ 4.5 shown in Figure 1, and test pieces obtained by cutting commonly available FRP tanks and hard hats.

1) Heat resistance test: The bending strength was determined in an atmosphere of 20°C and 100°C, and the decrease in strength was expressed as an index.

2) Fire resistance test: The state of the test piece was observed when it was directly exposed to the flame of a gas burner.

3) Weather resistance test: Using a sunshine weather meter,
The tendency of deterioration over time was shown by the bending strength retention rate.

4) Abrasion resistance test: Using a taper set abrasion tester, [Effects and Applications of the Invention] The fiber-reinforced product of the present invention has excellent durability such as heat resistance, fire resistance, and weather resistance, and has excellent strength and abrasion resistance. I know that there is.

In addition, the present invention can be used for construction materials such as flat plates, corrugated plates, scaffolding boards, temporary materials, and water tanks.
Household equipment-related household items such as washbasins, racks, drying racks, etc.? Boats, yachts, fishing boats, and other vessels related to surf dates, leisure equipment such as skates and boats, grotesque bodies, helmets, masks, etc.
Safety equipment and protective equipment □ Aircraft/spacecraft related items such as main wings, aircraft, fuselage, etc. Road installations such as road signs, guardrails, storage tanks, silos, water tanks, etc. Stationery related to containers, pencil cases, underlays, etc. Plastic greenhouse pipes, hydroponic cultivation equipment, etc.
Agriculture-related cases, caps, exterior materials, lining materials, and other home appliance-related ornaments; wall hangings, and other art objects; hanging rods, fishing rods, ski poles, antennas, etc.
It can be used in a wide range of applications, such as those related to

Claims (1)

[Claims] A fiber-reinforced product characterized by consisting of a hydraulic binder whose main components are cement, ultrafine powder, and a high-performance water reducer, and a fibrous reinforcing material.