JPS62104712A - Mold for forming - Google Patents

Abstract

PURPOSE:To obtain a mold for FRP of easy forming, economy, high transferring and high strength, by utilizing a high strength cement and a mixture of a fiber and a synthetic resin as the main components. CONSTITUTION:A high strength cement with the compression strength higher than 1,000kgf/cm<2> is used. The main components consist of cement materials, ultrafine powder, high performance water-reducing agent and water. Single elements of alite, C3S, standard, premature strength, and white Poltland cements or their mixtures, or the mixed cement prepared from the high temperature furnace slag, flyash, etc. are used. The quantity of an ultrafine powder is preferable 40-5wt% against 60-95wt% of the cement material. The solid content of 1-5wt% against the cement material is used for the water-reducing agent consisting of naphthalenesulfonic acid, formaldehyde condensate salt and polycarboxylic acid salt, etc. Here, 10-30wt% of water against 100wt% of a mixture of the cement material and the ultrafine powder is desirably used. A thermohardening resin such as an unsaturated polyester, an epoxy, etc. for the synthetic resin and a hydrophobically treated glass fiber for the fiber are respectively used.

Description

[Detailed Description of the Invention] [Industrial Application Method] The BA of the present invention is a mold for molding fiber-reinforced plastic (hereinafter referred to as F'RP) made of high-luminance cement;
More specifically, the present invention relates to a mold made of high-strength cement for obtaining an IR product by molding and curing a composite material mainly composed of fibers and synthetic resin.

[Prior art]

The mechanical molding method for F'RP is to mold a mixture mainly composed of fibers and synthetic resin by full press molding or injection molding, and harden it by heating etc.
lding compound (SMC) and E
u1k Molding Compound (BMC
) The molding method etc. are attracting attention. These are conventional L
FRP (D molding method, for example, has advantages such as a shorter molding cycle and the ability to obtain products with excellent surface properties compared to spray-up methods, etc.), and is suitable for automobile parts,
It is used for molding bathtubs, building materials, electrical parts, etc. Especially in connection with the future plasticization of automobile bodies, etc., methods such as 8MC molding method and 3MC molding method that can be automated,
Its development is expected.

The molds used for these moldings are made of cast iron, aluminum, resin, etc., but molds made of cast iron and aluminum require complicated mold processing and require a long manufacturing period, resulting in high costs. Becomes high.

Furthermore, although the molding method for molds made of resin is simple, there is a problem with durability under high temperatures because the mold is heated to harden it.

From the above, it is easy to manufacture, the production period is short,
There is a strong desire for an IFRP mold that has excellent durability under heating conditions.

Cement concrete is widely used in the field of civil engineering and construction because it can be molded at room temperature and is easy to handle. However, the conventionally used ones have the disadvantage of poor surface transferability due to material separation and breathing, which is a problem from the point of view of application to molds.

[Problem that the invention seeks to solve]

Based on the above, the present inventor has conducted various tests and found that, by using, for example, cementitious material, ultrafine powder, high-performance water reducing agent, and high-strength cement whose main components are water, The present invention was completed based on the knowledge that an easy-to-manufacture FRP molding mold with excellent durability and surface transferability can be used.

[Means for solving problems]

That is, the present invention is a mold for molding a mixture made of high-strength cement and having fibers and synthetic resin as the main components.

The present invention will be explained in detail below.

SMC is generally used in the method of molding and curing a mixture mainly composed of fibers and synthetic resin in the present invention.

This is called BMC molding, and the molding process is as shown in the drawings.

The mold described here is one used in hot press molding in SMC, press molding in BMC, transfer molding, injection molding, or a molding method similar thereto.

The high strength cement of the present invention is, for example, 100100O/
This is because it is better to use less water in terms of surface transferability rather than strength.Also, considering the reduction of material separation, breathing, etc. It is preferable to use a high strength cement based on cementitious material, ultrafine powder, high performance water reducing agent and water metal.

The cementitious material referred to here is Neelite, 03rd,
Ordinary, early-strength, ultra-early-strength, white or l#tel salt-resistant various types of Portland cement are used singly or in combination, and mixed cements such as blast furnace slag, flyash, etc. are generally used. Also used is a combination of straw furnace slag as a living body and an alkaline stimulant.

In addition, we can use expanded cement If to compensate for shrinkage, or use rapid hardening cement to develop the required strength in a short time.
A gypsum-based high-strength admixture can also be used.

The j11 component of expansive cement is ettringite type, such as "CBA" manufactured by Denki Kagaku Kogyo Co., Ltd.
2 D J or calcined CaO is preferable, and ts formed C
Among those in the 50 range, those fired at 1,100 to 1,300°C and having an average crystal diameter of 10 μm or less are preferred.

The quick-hardening component of quick-hardening cement is preferably calcium aluminate-based, such as alumina cement, a combination of alumina cement and gypsum, and Denki Kagaku Kogyo (
Arrangement, product name “Denka IsJ Ya Onoda Cement (company)
manufactured by the company, and the product name ``Jet Cement'' is used.

In addition, high-strength admixtures are gypsum-based, for example, Denka Kagaku Kogyo (2), product name "Denka Σ-1000J", Nippon Cement Co., Ltd., product name "Atheno Seaper Mix", etc. are effective. It is.

The ultrafine powder used here is a cementitious material (average particle size 1
0 to 30 μm), and those having an average particle size two orders of magnitude smaller are preferred from the viewpoint of the fluidity characteristics of the interfering material. Specifically, silica dust (silica fume) and siliceous dust, which are by-products during the production of silicon, silicon-containing alloys, and zirconia, are particularly suitable, and calcium carbonate, silica dust, opalescent silica, fly ash, and blast furnace slag are particularly suitable. ,
Finely pulverized products of titanium oxide and aluminum oxide or cementitious materials can also be used. In particular, the use of ultrafine powder that has been pulverized by using 1-opal silica, fly ash, and blast furnace slag in combination with a classifier and a pulverizer is effective in improving hardening shrinkage.

It is preferable that the ultrafine powder be used in an amount of 40 to 5 parts per 60 to 95 M parts of the cementitious material, and more preferably 65 to 90 parts. The amount is 65 to 10 parts by weight based on the violet part. 5
If the amount is less than 1i part, the effect of developing high strength will be small, and if the amount is less than 40
When the temperature exceeds the storm point, the fluidity of the kneaded material decreases significantly, making it difficult to mold, and the strength development becomes opaque.

Here, 5i1 performance water reducing agent (hereinafter referred to as water reducing agent) is a surfactant with a large dispersion ability that does not cause excessive setting delay or excessive 9 air flow rate even if a large amount of 4i is added to cement.
For example, salts of naphthalene sulfonic acid formaldehyde condensates, salts of melamine sulfonic acid formaldehyde condensates,
Examples include those whose main components are polymer capped lignin sulfonates, polycarboxylate salts, and the like.

Conventionally, a water reducing agent is used in an amount of 0.6 to 1X lid% as a solid content for a cementitious material, but in the present invention, it is preferable to add it in a larger amount.
More preferably 1 to 5 parts by weight.

A water reducing agent is necessary to obtain a kneaded product with a low water/(cement + ultrafine powder) ratio (hereinafter referred to as low water powder ratio),
If it exceeds 10X parts, it will adversely affect the curing reaction. By combining the ultrafine powder with such a high performance water reducing agent in an amount of 5.5 mm, it is possible to obtain a fluid mixed material that can be molded by a conventional method even if the water/powder ratio is 25 mm or less.

The water used here is necessary for molding, and in order to obtain a high-strength hardened product, it is sufficient to use as little water as possible.
A 0-layer base portion is preferable, and a 12-25 layer foot portion is more preferable. The amount of water is 60! If the amount is more than Dobe, it is difficult to obtain a high-strength cured product, and 10! If the amount is less than i part, normal molding such as pouring becomes difficult. In addition, in compression molding etc.
The present invention is not limited to this, and molding is possible even when the number of parts is less than 10Xik. Furthermore, it is also possible to use a molding method normally used for cement concrete, such as extrusion molding.

In most cases, aggregate is generally used in addition to this.

The aggregate may be one that is generally used when mixing concrete in the field of civil engineering and construction, but it may be a harder one, specifically one with a Mohs hardness of 6 or more, preferably 7 or more, or a Knoop indenter hardness of 700 kg/M2. More preferably 8
It is preferable to use a material selected based on any of the criteria of 00 #/mtx2 or more because the strength can be significantly improved.

□ Examples of materials that meet all of these criteria are silica, emery, pyrite, magnetite, yellow jade, lawsonite, corundum, zenanite, spinel, beryl, goldstone, tourmaline,
Granite, andalusite, cross stone, zirconite, calcined sarcosite, heavy calcined earthenite, sulfur carbide, tungsten carbide, ferrosilicon nitride, silicon nitride, bath-fused silica, fused magnesia, silicon carbide, There are metallic materials such as cubic quantified boron and iron powder and iron balls.

The amount of aggregate to be used is usually selected within 5J [amount times violet] for the total amount of cementitious material and ultrafine powder. However, this does not apply to special molding methods such as pre-packed construction methods and post-packed construction methods.

In addition to the above formulations, it is also possible to incorporate fibers and nets.

Examples of fibers include cast iron fibers made by chatter cutting, steel fibers, stainless steel fibers, natural and synthetic mineral fibers such as asbestos and alumina fibers, carbon fibers, glass fibers, and polypropylene, vinylon, acrylonitrile,
Examples include natural fibers such as cellulose, and synthetic organic fibers. In addition, steel rods and F
It is also possible to use RP rods, which are indispensable for very large rods.

In addition, it is also possible to add so-called solid lubricants such as molybdenum disulfide and hexagonal boron nitride to provide other functions, such as sliding properties. It is also possible to use t, etc.

In addition, it is also possible to incorporate materials that impart special properties such as thermal properties and electrical properties.

Any method of mixing and kneading the above-mentioned materials may be used as long as they can be mixed and mixed uniformly, and the order of addition is not particularly limited.

Various curing methods are possible for curing the molded product, including room temperature curing,
Any of the methods of normal pressure steam curing, high temperature pressure curing, and high temperature curing can be employed, and if necessary, a combination of these methods can be used to obtain a high-strength cured product.

In addition, the synthetic resin used in FRP is generally a thermosetting one such as unsaturated polyester or epoxy, and various fibers are possible as the fiber.
Hydrophobically treated glass fibers are common.

Also, a mixture whose main components are fibers and synthetic resin is one in which fibers and synthetic resin are mixed before being molded, such as a mixture that has not yet hardened or a mixture that has been mixed into a sheet shape. Examples include.

In addition, the mold used in the present invention generally uses thermosetting unsaturated polyester, epoxy, etc. in PRP, but in that case, it is necessary to heat and harden it. This can be done by placing temperature control pipes or electric heating veins inside the mold, or by having a low external conductivity, but once heated, it is possible to completely mold the mold by cooling it with fat or ceramics.

Example 1 Inter-strength cement molds were prepared using the following formulation.

The production period is one week, and the usual mold etc./2! i: The production period for shaping is surprisingly shortened compared to the 12 to 22 weeks required for machining.

The pressure strength of high-strength cement is 1,750! 9f/α
It was 2.

Cement: Ordinary Portland cement 8 [1jjLff
Part I (Sumitomo Cement) Ultra-fine powder Nijirikahiyum 20 Arashi Sumito (Japanese Mukai) Member back W: Net work Oniwa U, 6-1, l tm z1
20! Partially high aqueous reducing agent: β-naphthalene sulfo/acid acid 2 parts by weight Formalin
Fiber: Steel fiber made by Tsuyoshi Hihi 9 Kiri 7 Rin Yiji (Kobe Foundry Works H) Jl = 2 ms Water: 20X parts of tap water 8MC molding was carried out using the above high-strength cement mold. . SMC is glass, glass fiber, unsaturated polyester,
It consists of a hardening agent, thickener, filler and pigment, and after heating the mold to 150℃ with hot air, it is made into SMCf 120k.
g/CrrL". As a result, an FRP molded product with good surface roughness was obtained.

Example 2 A high-strength cement-filled mold was created according to the distribution shown below. The compressive strength at that time was 1,540 kgf/d.

Cement: Ordinary Portland cement 8 [] JUf part (
Sumitomo Cement 9 Ultra Fine Powder Nijirikahium 20! jt part (Japan No. 1) Aggregate: Yomu (Oen) 2LILJ 厘jutoshosei rudder akikushun''; ``Self 0-110#J 2rinyiji (No. 1) Fiber: By chatter cutting method 7 BMC' was injection molded using the above high-strength cement mold.BMC was made of glass fiber, epoxy resin, A filler was used, and the molding temperature was 150°C and the injection pressure was 250 kg/crn2.Under these conditions, an F'RP molded product could be obtained.

〔Effect of the invention〕

As described above, the present invention allows for very easy molding.
FBI' is economical, has excellent transferability, and has high strength.
We are now able to provide molds for

[Brief explanation of drawings]

The drawing is a flow sheet of a molding method using all the molds of the present invention. Row 11 to 5tiC, 1-21tBI-I
Forming flow sheet to C ゛chi 1゜

Claims (1)

[Claims] (1) A mold for molding a mixture made of high-strength cement and whose main components are fiber and synthetic resin.