JP3216890B2 - Epoxy resin-based polymer cement composition, epoxy resin-based polymer cement mortar composition and method for curing the same. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polymer cement composition, a mortar composition and a method for curing the same, and more particularly to a cured cement body having excellent mechanical strength such as flexural strength, compressive strength and adhesive strength. The present invention relates to an epoxy resin-based polymer cement composition, a mortar composition, and a method for curing the same.

[0002]

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

[0003] In recent years, polymer cement mortars using such epoxy resins as admixtures have been developed. In particular, polymer cement mortars in which an emulsion of a cured epoxy resin is mixed are known. However, the strength of the cured product formed from the polymer cement mortar is comparable to that of the cured product 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 been sufficiently developed. Therefore, polymer cement in which an epoxy resin before curing is directly mixed into cement mortar has been studied.

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

Japanese Patent Application Laid-Open No. Sho 60-137957 discloses a putty-like cement of an epoxy resin non-solvent type using a low molecular weight epoxy resin as an admixture. A putty-like cement mortar using such an epoxy resin as an admixture is used as a quick-setting underwater-curable polymer cement mortar.

The present inventors have also studied a polymer cement mortar using an epoxy resin comprising a bisphenol-A type epoxy resin and an amine-based curing agent as an admixture, and published the results. (Abstracts of the 41st Cement Technology Congress; pp. 100-101, May 1987) By the way, in the above-mentioned conventional technology, the epoxy resin used as an admixture is a two-pack type epoxy resin. Resins, all of which are used together with a curing agent such as an amine compound. In a cured cement obtained from a polymer cement mortar in which such an epoxy resin is mixed with a curing agent such as an amine compound, a matrix is formed by a hydration reaction of cement and a curing reaction between the epoxy resin and the curing agent. And the strength has improved.

However, in such a polymer cement mortar using 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 to cement weight relative to the cement weight] is required. Ratio (usually, weight percentage)] must be increased. In addition, there is a problem in that the amount of air in the cured cement material increases, so that an antifoaming agent must be mixed. Epoxy resin-based polymer cement mortars are expensive and tend to be less economical.

[0008] For this reason, there has been a demand for a polymer cement mortar which is excellent in mechanical strength and physical performance as well as economical. The present inventors have further studied, and as a result, there is no increase in the amount of air due to the admixture of the epoxy resin, an epoxy compound containing no curing agent is used as the admixture, and the polymer content in the composition is small. A cement hardened body that has excellent mechanical strength such as bending strength and compressive strength, low drying shrinkage, excellent resistance to water absorption, neutralization and chloride ion penetration, and is also economical. The present invention has been completed by obtaining an epoxy resin-based polymer cement composition, a mortar composition, and a method for curing the same, which can be formed.

[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 cured cement body having excellent mechanical strength such as flexural strength, compressive strength and adhesive strength. An object and a method for curing the same are provided.

[0010]

SUMMARY OF THE INVENTION The epoxy resin-based polymer cement composition according to the present invention comprises: [I] cement: 100 parts by weight; [II] liquid epoxy compound containing no epoxy compound curing agent : 0.5 to 20 parts. It is characterized by consisting of .

The epoxy resin-based polymer cement mortar composition according to the present invention comprises: [I] 100 parts by weight of cement; [II] 0.5 to 20 parts of a liquid epoxy compound containing no epoxy compound curing agent . [III] Aggregate: characterized by comprising 50 to 500 parts.

The method of curing an epoxy resin-based polymer cement mortar composition according to the present invention comprises kneading the above-mentioned epoxy resin-based polymer cement mortar composition with water to form a mortar, without adding a curing agent. It is characterized by being cured.

[0013]

DETAILED DESCRIPTION OF THE INVENTION The epoxy resin-based polymer cement composition according to the present invention comprises a cement [I] and an epoxy compound.
And a liquid epoxy compound [II] containing no curing agent .

Examples of the cement [I] used in the present invention include widely used cements, and are not particularly limited. Examples thereof include the following cements.

Ordinary Portland cement, early-strength Portland cement, ultra-high-strength Portland cement, moderate heat Portland cement, sulfate-resistant Portland cement,
Portland cement such as white Portland cement, alumina cement, ultra-fast-hardening cement, expanded cement, acid phosphate cement, self-hardening cement such as anhydrous and hemihydrate gypsum, lime slag cement, blast furnace cement, high sulfate slag cement, keince Latent hydraulic cement such as cement, lime-silicate mixed cement, and mixed cement made of a system other than lime-silicic acid can be used.

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 [II] used in the present invention
As the resin, those generally known as epoxy resins can be widely used. 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 an epoxy resin is preferably liquid. Such a 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 such as an amine compound or an acid anhydride. Contains no curing agent.

In such an epoxy resin-based polymer cement composition, the epoxy compound [II] is used in an amount of 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 optionally contain a filler. As fillers, calcium carbonate, silica,
Examples include clay, talc, kaolin, aluminum hydroxide, aluminum oxide, and glass beads. Such fillers are commonly used in cement [I] 1
1 to 50 parts by weight, preferably 3 to 50 parts by weight, per 100 parts by weight
It is blended in an amount of 30 parts by weight.

The epoxy resin-based polymer cement composition according to the present invention may further comprise an air entrainer (A) if necessary.
E), a water reducing agent, a stabilizer, an SBR latex, and other admixtures.

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

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

In the present invention, the size of the aggregate is not limited. 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 same as the cement [I] in the 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 generally used as a curing agent for an epoxy resin, such as an amine compound or an acid anhydride.

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

The kneading may be performed, for example, by using a crout mixer,
The mixing is performed using a mixer generally used for mixing a cement composition, such as a mortar mixer or a concrete mixer.

In the mortar obtained in this manner, 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 even if it does not contain an antifoaming agent. Low air content compared to mortar obtained from cement composition. 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 or an acid anhydride.

For curing, the mortar is usually treated with 7-28.
It is done by curing for days. The mortar obtained from the epoxy resin-based polymer cement mortar composition according to the present invention does not contain a curing agent that is generally used as an epoxy curing agent such as an amine compound and an acid anhydride. It is hardened by a healthy curing. This is considered to be because the cement acts as a curing agent for the epoxy resin during the mortar curing process.

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

[0033]

According to the epoxy resin-based polymer cement composition, the mortar composition and the method for curing the same according to the present invention, an epoxy resin-based cement containing a hardened cement mortar or a hardening agent such as an amine compound is contained. A mortar cured product having excellent mechanical strength such as flexural strength, compressive strength and adhesive strength as compared with a mortar cured product obtained from the composition can be provided with high economic efficiency.

Hereinafter, the present invention will be described with reference to Examples.
The present invention is not limited to these examples.

[0035]

Examples 1 to 5 Epoxy resin-based polymer cement compositions having the compositions shown in Table 1 were obtained. In addition, each component used the following.

Cement; ordinary Portland cement epoxy compound; bisphenol A type epoxy resin (average molecular weight: 380) (Epicoat 828, manufactured by Yuka Shell Epoxy Co., Ltd.) , The above cement 100
1 to 80 parts by weight of the epoxy compound and 300 parts of aggregate (Toyoura standard sand) are added to the parts by weight, and the water-to-cement ratio (weight percentage of water to cement weight) is adjusted so that the mortar flow value becomes 170 ± 5. Was adjusted and kneaded with the epoxy resin-based polymer cement mortar. Put this mortar in a 40 × 40 × 160 mm formwork,
2 days wet air (20 ° C., 80% RH), 5 days water (20
℃), and dried (20 ° C, 50% RH) curing for 21 days to obtain a specimen.

[0037] Regarding this specimen, JIS A 117
Bending and compression tests were performed according to 2. Further, the adhesive strength was measured according to JIS A 6915 (thick finishing material).

In addition to the above, the following tests were conducted. Drying shrinkage test; JIS A 1129 (method of changing length 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 for polymer cement mortar (draft) based on the Japan Concrete Institute Society of Polymer Cement Mortar Test Method Standard (draft).

Chloride ion penetration depth test; chloride ion penetration depth test method (draft) for polymer cement mortar according to the Japan Concrete Institute Society of Polymer Cement Mortar Test Method Standard (draft).

Table 1 shows the results.

[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.

A specimen was prepared from this mortar composition in the same manner as in the above example. The same test as that of the example was performed on this specimen. Table 1 shows the results.

[0044]

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

The cement and the epoxy compound were the same as those in the respective examples, and the following components were used as the other components. Curing agent: Amine-based curing agent (Self-emulsifying epoxy resin curing agent SE-11, manufactured by Yuka Shell Epoxy Co., Ltd.) A specimen was prepared from these mortar compositions in the same manner as in the Examples.

The same test as in the example was performed on this test piece. Table 1 shows the results.

[0047]

[Table 1]

Continuation of front page (56) References JP-A-61-141655 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C04B 14/00-28/36

Claims (3)

(57) [Claims] 1. An epoxy resin-based polymer cement composition comprising: [I] cement: 100 parts by weight; and [II] a liquid epoxy compound containing no epoxy compound curing agent: 0.5 to 20 parts. object. 2. [I] Cement: 100 parts by weight, [II] Liquid epoxy compound containing no epoxy compound curing agent: 0.5 to 20 parts, [III] Aggregate: 50 to 500 parts An epoxy resin-based polymer cement mortar composition characterized by comprising: 3. I: Cement: 100 parts by weight, [II] Liquid epoxy compound containing no epoxy compound curing agent: 0.5 to 20 parts, and [III] Aggregate: 50 to 500 parts. A method for curing an epoxy resin-based polymer cement mortar composition, comprising kneading an epoxy resin-based polymer cement mortar composition into a mortar by kneading with water and then curing without adding a curing agent.