JPH059051A - Epoxy resin polymer cement composition, hardening epoxy resin polymer cement mortar composition and method thereof - Google Patents

Abstract

PURPOSE:To provide an epoxy polymer cement composition, an epoxy resin polymer cement mortar composition and hardening methods thereof, enabling to form a hardened cement body being superior in mechanical strengths such as flexual, a compression, adhesive strengths. CONSTITUTION:The epoxy polymer cement composition is characterized by consisting of [I] cement: 100 pts.wt. and [II] the epoxy compounds: 0.5-20 pts.wt. and not containing a hardener for the epoxy compound. The epoxy resin polymer cement mortar composition is characterized by consisting of @{9146/218}I] cement: 100 pts.wt., [II] the epoxy compounds: 0.5-20 pts.wt. and [III] aggregates: 50-500 pts.wt. and not containing the hardener for the epoxy resin.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polymer cement composition, a mortar composition and a method for curing the same, and more specifically, to form a cement hardened product having excellent mechanical strength such as bending strength, compressive strength and adhesive strength. Epoxy resin-based polymer cement composition, mortar composition and method for curing the same.

[0002]

TECHNICAL BACKGROUND OF THE INVENTION Epoxy resins are concrete,
It has excellent adhesion to mortar and steel, and is widely used as an adhesive for civil engineering and construction.

In recent years, a polymer cement mortar containing such an epoxy resin as an admixture has been developed, and in particular, a polymer cement mortar mixed with an emulsion of a cured epoxy resin is known. However, the strength of the hardened body formed from this polymer cement mortar is similar to that of the hardened body formed from the polymer cement mortar mixed with the polymer dispersion for cement admixture (for example, SBR latex, EVA and PAE emulsion). However, the strength of the epoxy resin itself has not yet reached the level at which the characteristics of the epoxy resin itself are fully expressed. Therefore, research has been conducted on polymer cement in which an epoxy resin before curing is directly mixed with cement mortar.

As a polymer cement mortar mixed with such an epoxy resin before curing, for example, in Japanese Patent Laid-Open No. 57-12024, an epoxy resin mixture containing an epoxy resin and an amine curing agent as a main component and cement are used. The following epoxy resin composition is disclosed. Such an epoxy resin composition is useful as an adhesive between concretes wet with water or as a waterproofing agent for concrete surfaces.

Further, JP-A-60-137957 discloses an epoxy resin solvent-free putty-like cement containing a low molecular weight epoxy resin as an admixture. A putty-like cement mortar containing such an epoxy resin as an admixture is used as a quick-setting type water-curable polymer cement mortar.

The present inventors also studied a polymer cement mortar containing an epoxy resin composed of a bisphenol-A type epoxy resin and an amine type curing agent as an admixture and published the results. (Abstracts of the 41st Cement Technology Conference Lectures; pages 100-101, May 1987) By the way, the epoxy resin used as an admixture in the above-mentioned conventional technique is a two-component epoxy resin. It is a resin and is used together with a curing agent such as an amine compound. In a hardened cement product obtained from polymer cement mortar in which such an epoxy resin is mixed with a hardening agent such as an amine compound, a matrix is formed by the hydration reaction of cement and the hardening reaction between the epoxy resin and the hardening agent. And the strength is improved.

However, in such a polymer cement mortar containing an epoxy resin as an admixture, it is necessary to add a curing agent such as an amine compound as described above, and the polymer cement ratio [epoxy resin and curing agent relative to the cement weight is required. The total weight ratio (usually the percentage by weight)] must be increased. Further, since the amount of air in the hardened cement material increases, there is a problem that an antifoaming agent must be mixed. Epoxy resin-based polymer cement mortar is expensive and tends to be inferior in economic efficiency.

Therefore, it has been desired to develop a polymer cement mortar excellent in mechanical strength and physical performance as well as economical efficiency. As a result of further research, the inventors of the present invention did not increase the amount of air due to the admixture of the epoxy resin, use an epoxy compound containing no curing agent as an admixture, and have a small polymer content in the composition. , A cement hardened product that has excellent mechanical strength such as bending strength and compressive strength, small drying shrinkage, excellent resistance to water absorption, neutralization and permeation of chloride ions, and also excellent in economic efficiency. The present invention has been completed by obtaining an epoxy resin-based polymer cement composition that can be formed, a mortar composition, and a method for curing the same.

[0009]

An object of the present invention is to provide an epoxy resin-based polymer cement composition and an epoxy resin-based polymer cement mortar composition capable of forming a hardened cement product having excellent mechanical strength such as bending strength, compressive strength and adhesive strength. An object and a method of curing the same.

[0010]

SUMMARY OF THE INVENTION An epoxy resin-based polymer cement composition according to the present invention comprises [I] cement: 100 parts by weight and [II] epoxy compound: 0.5-20 parts, and comprises a curing agent for the epoxy compound. It is characterized by not including.

The epoxy resin-based polymer cement mortar composition according to the present invention comprises [I] cement: 100 parts by weight, [II] epoxy compound: 0.5-20 parts, and [III] aggregate: 50-500. And is characterized by not containing a curing agent of an epoxy compound.

The method for curing the epoxy resin-based polymer cement mortar composition according to the present invention is a method in which the epoxy resin-based polymer cement mortar composition as described above is kneaded with water to form a mortar, and then no curing agent is added. It is characterized by hardening.

[0013]

DETAILED DESCRIPTION OF THE INVENTION The epoxy resin-based polymer cement composition according to the present invention comprises cement [I] and an epoxy compound [II].

Examples of the cement [I] used in the present invention include commonly used cements and are not particularly limited. For example, the following cements can be mentioned.

Normal Portland cement, early strength Portland cement, super early strength Portland cement, moderate heat Portland cement, sulfate resistant Portland cement,
Portland cement such as white Portland cement, alumina cement, ultra-rapid cement, expansive cement, acid phosphate cement, self-hardening cement such as anhydrous and hemihydrate gypsum, lime slag cement, blast furnace cement, high sulfate slag cement, keens Examples thereof include latent hydraulic cements such as cement, lime silicic acid-based mixed cements, and mixed cements composed of systems other than lime silicic acid.

Of these, Portland cement is preferably used in the present invention. The above cements can be used alone or in combination of two or more.

Epoxy compound used in the present invention [II]
A widely known epoxy resin can be widely used as the epoxy resin. For example, an epoxy resin obtained from bisphenol-A and epichlorohydrin can be used.

Further, a modified epoxy resin obtained by modifying this epoxy resin with a polyester resin, a phenol resin, a melamine resin or the like can be used. In the present invention,
Such epoxy resin is preferably liquid. Such liquid epoxy resin generally has an average molecular weight of 100 to 4000, preferably 300 to 500.

The epoxy resin-based polymer cement composition according to the present invention comprises the above cement [I] and epoxy compound [II], and is generally used as an epoxy curing agent for amine compounds, acid anhydrides and the like. It does not contain any curing agent.

In such an epoxy resin-based polymer cement composition, the amount of the epoxy compound [II] is 0.5 to 20 parts by weight, preferably 1 to 10 parts by weight, based on 100 parts by weight of the cement [I]. It is contained in.

The epoxy resin-based polymer cement composition according to the present invention may contain a filler if necessary. As the filler, calcium carbonate, silica,
Examples thereof include clay, talc, kaolin, aluminum hydroxide, aluminum oxide and glass beads. Such fillers are usually cement [I] 1
1 to 50 parts by weight, preferably 3 to 50 parts by weight
It is compounded in an amount of 30 parts by weight.

In the epoxy resin-based polymer cement composition according to the present invention, an air entraining agent (A
Other admixtures such as (E agent), a water reducing agent, a stabilizer, and SBR latex can also be blended.

The epoxy resin-based polymer cement mortar composition according to the present invention comprises the above-mentioned epoxy resin-based polymer cement composition and an aggregate [III]. Examples of the aggregate [III] used in the present invention include the same aggregates as those generally used when preparing cement mortar or concrete.

Specific examples thereof include fine aggregates such as river sand and mountain sand, coarse aggregates such as river gravel and crushed stone, lightweight aggregates such as expanded shale, calcined fly ash, perlite and vermiculite.

In the present invention, the aggregate does not limit the particle size. Thus, the term "mortar" as used herein also includes concrete, which is usually distinguished by aggregate size.

In the epoxy resin-based polymer cement mortar composition according to the present invention, the aggregate [III] is the cement [I] in the above epoxy resin-based polymer cement composition.
It is contained in an amount of 50 to 500 parts by weight, preferably 100 to 300 parts by weight, based on 100 parts by weight. The epoxy resin-based polymer cement mortar composition according to the present invention does not contain a curing agent that is generally used as a curing agent for epoxy resins, such as amine compounds and acid anhydrides.

In the present invention, the above epoxy resin-based polymer cement mortar composition is kneaded with water to form a mortar, which is then cured. The mortar is usually 30 to 100 parts by weight of water with respect to 100 parts by weight of cement [I] in the epoxy resin polymer cement mortar composition.
It is obtained by adding and kneading in an amount of parts by weight. In such a mortar, the flow value is usually 165-
It is preferably 175 [mm].

The kneading and mixing can be carried out, for example, by a clout mixer,
It is performed using a mixer generally used for mixing the cement composition, such as a mortar mixer and a concrete mixer.

In the mortar thus obtained, mortar obtained from ordinary cement or an epoxy resin-based polymer containing a curing agent such as an amine compound at the same flow value without containing a defoaming agent. It has a lower air content than mortar obtained from cement compositions. Such a mortar having a low air content can form a cured product having excellent mechanical strength such as compressive strength.

In the present invention, the mortar thus obtained is cured without using a curing agent generally used as an epoxy curing agent such as an amine compound and an acid anhydride.

The curing is usually carried out by adding 7 to 28 to the above mortar.
It is done by curing for days. The mortar obtained from the epoxy resin-based polymer cement mortar composition according to the present invention is as described above, although it does not contain a curing agent generally used as an epoxy curing agent such as an amine compound and an acid anhydride. Hardened by proper curing. It is considered that this is because the cement acts as a curing agent for the epoxy resin in the curing process of the mortar.

The mortar hardened product obtained as described above is superior in mechanical strength such as bending strength, compressive strength and adhesive strength to the ordinary cement hardened product obtained from cement containing no epoxy compound. Not only water absorption, water permeability, neutralization and chloride ion immersion. Further, the mortar cured product obtained in the present invention is, compared with the epoxy resin-based polymer mortar cured product containing a conventional curing agent,
The polymer content can be lowered, and the economy is excellent.

[0033]

According to the epoxy resin-based polymer cement composition, the mortar composition and the curing method thereof according to the present invention, an epoxy resin-based cement containing a non-mixed cement mortar cured product or a curing agent such as an amine compound. A cured mortar that is superior in mechanical strength such as bending strength, compression strength, and adhesive strength to the cured mortar obtained from the composition can be provided economically.

The present invention will be described below with reference to examples.
The present invention is not limited to these examples.

[0035]

Examples 1 to 5 Epoxy resin polymer cement compositions having the compositions shown in Table 1 were obtained. The following components were used as each component.

Cement; ordinary Portland cement epoxy compound; bisphenol A type epoxy resin (average molecular weight 380) (Epicoat 828, manufactured by Yuka Shell Epoxy Co., Ltd.) in accordance with JIS A 117 (how to make polymer cement mortar in a test room) , Above cement 100
1-80 parts by weight of epoxy compound and 300 parts of aggregate (Toyoura standard sand) are added to parts by weight, and the water-cement ratio (weight percentage of water amount to cement weight) is further adjusted so that the flow value of mortar is 170 ± 5. Was adjusted, and the epoxy resin-based polymer cement mortar was kneaded and mixed. Put this mortar into a 40 × 40 × 160 mm mold,
2 days wet air (20 ℃, 80% RH), 5 days in water (20
C.) and dried for 21 days (20.degree. C., 50% RH) to obtain a sample.

Regarding this test piece, JIS A 117
Bending and compression tests were performed according to 2. Further, the adhesive strength was measured according to JIS A 6915 (thick coating finish coating material).

In addition to the above, the following tests were conducted. Drying shrinkage test; JIS A 1129 (Test method for length change of mortar and concrete) Water absorption test; Water absorption test method specified in JIS A 6203 (polymer dispersion for cement admixture).

Accelerated Neutralization Test; Accelerated Neutralization Test Method (Draft) for Polymer Cement Mortar of Japan Concrete Institute, Polymer Cement Mortar Test Method Standard (Draft)

Chloride ion penetration depth test: Chloride ion penetration depth test method (plan) of Polymer Cement Mortar of Japan Concrete Engineering Association Polymer cement mortar test method standard (plan).

The results are shown in Table 1.

[0042]

Comparative Example 1 300 parts by weight of aggregate (Toyoura standard sand) was added to 100 parts by weight of ordinary Portland cement to obtain a mortar composition.

Specimens were prepared from this mortar composition in the same manner as in the above-mentioned examples. The same test as in the example was performed on this test piece. The results are shown in Table 1.

[0044]

Comparative Examples 2 to 4 Epoxy resin polymer cement compositions and mortar compositions containing the amine curing agents having the compositions shown in Table 1 were obtained.

The cement and the epoxy compound were the same as those in the examples, and the other components were as follows. Curing agent: Amine-based curing agent (self-emulsifying epoxy resin curing agent SE-11, manufactured by Yuka Shell Epoxy Co., Ltd.) These mortar compositions were used to prepare specimens in the same manner as in Examples.

The same test as in the example was conducted on this test piece. The results are shown in Table 1.

[0047]

[Table 1]

Claims (3)

[Claims] 1. An epoxy resin-based polymer cement composition comprising [I] cement: 100 parts by weight and [II] epoxy compound: 0.5 to 20 parts, and containing no epoxy compound curing agent. object. 2. [I] Cement: 100 parts by weight, [II] Epoxy compound: 0.5-20 parts and [III] Aggregate: 50-500 parts, and no epoxy compound curing agent is included. An epoxy resin-based polymer cement mortar composition characterized by the above. 3. [I] Cement: 100 parts by weight, [II] Epoxy compound: 0.5-20 parts and [III] Aggregate: 50-500 parts, not containing a curing agent for the epoxy compound. A method for curing an epoxy resin-based polymer cement mortar composition, which comprises kneading the epoxy resin-based polymer cement mortar composition with water to form a mortar, and then curing the composition without adding a curing agent.