JPH05302017A - Epoxy resin composition and its cured product - Google Patents

Abstract

PURPOSE:To obtain the title composition which is lowly viscous, has excellent workability and high safety for a worker, can give a cured product of excellent mechanical properties, and is desirable as a casting material or the like by mixing an epoxy resin with an alkyl carbonate. CONSTITUTION:The title composition is obtained by mixing an epoxy resin (A) (e.g. bisphenol A/epichlorohydrin condensate epoxy resin) with an alkyl carbonate (B) (e.g. dimethyl carbonate). It is desirable that component A comprises an epoxy resin of an epoxy equivalent of 100-5000g/eq and component B comprises an alkyl carbonate of a carbonate equivalent of 600-76g/eq. The mixing ratio by weight of component A to component B is suitably in the range of 60/40-99/1. When this composition further contains a compound containing a prim. amino group in the molecular skeleton (e.g. ethylenediamine), it can give a cured product more excellent in mechanical properties.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition useful for paints, insulating materials, adhesives, casting materials and the like, and further to workability, safety, mechanical strength and substrate adhesion. It relates to an excellent cured product.

[0002]

2. Description of the Related Art Epoxy resin compositions have excellent mechanical strength, substrate adhesion, etc.
It is used in many industrial fields such as civil engineering and construction.

However, in addition to having the above-mentioned excellent performance, when the liquid epoxy resin is molded by adding a curing agent, there is a problem that the workability is poor because the viscosity of the epoxy resin itself is high.

In order to solve this, conventionally, a low-viscosity epoxy resin such as butyl glycidyl ether and glycidyl ether of alkylphenol is used as a reactive diluent in the epoxy resin to reduce the viscosity of the epoxy resin and to improve workability during molding. Is being implemented.

[0005]

However, although the technique of using the above-mentioned conventional reactive diluent in combination has some improvement in workability, it is still not sufficient, and in the case of further improving workability. Has a problem that the mechanical strength of the cured product and the adhesion to the substrate are poor due to the large amount used, and the safety of the skin irritation due to the epoxy group of the reactive diluent is poor. It was

[0006] The problem to be solved by the present invention is to provide an epoxy resin composition having a low viscosity, excellent workability, and high safety for workers, and an epoxy resin composition having excellent mechanical strength and adhesion of a cured product to a substrate. To provide a cured product of.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to solve the above problems, and as a result, by adding an alkyl carbonate to the epoxy resin, the epoxy resin of It was found that the viscosity can be reduced and high safety can be obtained, and the present invention has been completed.

That is, the present invention comprises (A) an epoxy resin,
(B) Alkyl carbonate-containing epoxy resin composition, and (A) epoxy resin,
It relates to a cured product of an epoxy resin composition, which is obtained by adding (C) a compound having a primary amino group in the molecular skeleton to an epoxy resin composition containing (B) an alkyl carbonate.

The epoxy resin (A) used in the present invention is not particularly limited, but for example, "EPI"
CLON 850 "(manufactured by Dainippon Ink and Chemicals, Inc.,
Epoxy equivalent 188 g / eq), "EPICLON 1
050 "(manufactured by the same company, epoxy equivalent 475 g / eq) and other bisphenol A-epichlorohydrin condensate epoxy resins," EPICLON 830 "(manufactured by the same company, epoxy equivalent 172 g / eq) and other bisphenol F-epichlorohydrin condensate epoxy resins," EPICLON " N
-740 "(manufactured by the same company, epoxy equivalent 180 g / eq),
Novolak resin-epichlorohydrin condensate epoxy resin such as "EPICLON N-670" (manufactured by the same company, epoxy equivalent 210 g / eq), "EPICLON 15
2 "(manufactured by the same company, epoxy equivalent 360 g / eq) and other tetrabromobisphenol A-epichlorohydrin condensate epoxy resin," EPICLON 430 "(manufactured by the same company,
There is an aromatic glycidyl ether type epoxy resin such as a glycidyl amine type epoxy resin having an epoxy equivalent of 120 g / eq). Other special epoxy resins include alicyclic epoxy resins with the structure shown below.

[0010]

[Chemical 1]

[0011]

[Chemical 2]

[0012]

[Chemical 3]

(Here, R1 represents alkyl, alkyl ether, alkyl ester or alkyl amide.)
Examples thereof include glycidyl ester type epoxy resins such as phthalic acid diglycidyl ester and p-oxybenzoic acid diglycidyl ether ester, and hydantoin-based epoxy resins.

Among these, a bisphenol type epoxy resin is preferable from the viewpoint of excellent mechanical strength, substrate adhesion and curability, and further, bisphenol A-epichlorohydrin condensate epoxy resin, bisphenol F-epichlorohydrin condensate epoxy resin, or two. A cocondensation product of
Alternatively, a mixture of the two is preferable because it is remarkably excellent in mechanical strength, substrate adhesion and curability.

The epoxy equivalent of these epoxy resins is
The crosslink density of the cured product is in an appropriate range, and is 100 to 5000 g / from the viewpoint of its flexibility and mechanical strength.
eq is preferable, and 120 is particularly effective.
~ 3000 g / eq is preferred.

The alkyl carbonate (B) used in the present invention is not particularly limited, but a dialkyl carbonate compound represented by the following general formula (I) is preferable because of its remarkable effect of reducing the viscosity of the epoxy resin. preferable.

[0017]

[Chemical 4]

(In the general formula (I), R2 and R3 each independently represent a hydrogen atom or an alkyl group having 1 to 19 carbon atoms) Such an alkyl carbonate (B) has a carbonate equivalent of epoxy. 600-76 g / e from the viewpoint of the effect of reducing the viscosity of the resin and the excellent mechanical strength of the cured product.
It is preferably q, and particularly preferably 300 to 76 g / eq from the viewpoint that the mechanical strength of the cured product is remarkably excellent.

As such an alkyl carbonate,
Examples thereof include dimethyl carbonate, diethyl carbonate and dibutyl carbonate. Among them, dimethyl carbonate and diethyl carbonate are preferable because they are remarkably excellent in the effect of reducing the viscosity of the epoxy resin.

In the epoxy resin composition of the present invention, the compounding ratio of the epoxy resin (A) and the alkyl carbonate (B) is not particularly limited, but usually (A) / (B) = 60 in weight ratio. / 40 to 99/1, among which (A) / (B) = 80 from the viewpoint that the effect of the present invention is remarkably excellent.
It is preferably / 20 to 99/1.

The epoxy resin composition of the present invention can be made into a cured product excellent in mechanical strength by further adding a compound (C) having a primary amino group in its molecular skeleton. As the compound (C) having a primary amino group in the molecular skeleton used in the cured product of the present invention, any conventionally known compound can be used, and examples thereof include propylamine, butylamine, ethylenediamine, propylenediamine, and hexamethylenediamine. Amino compounds, diamine compounds such as xylenediamine, isophoronediamine, and mensendiamine, and amide type modified amines obtained by reacting the above diamine compounds with carboxylic acids, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, propylenediamine , Polyalkylene polyamines such as dipropyne triamine, benzyl ethylene diamine,
Aminoethylpiperazine and the above diamine compound are reacted with an epoxy group to obtain an adduct type modified amine, and among the above amide type modified amines, a compound having two or more amino groups in a molecule is reacted with an epoxy group. Amide adduct type modified amine obtained, adduct type modified amine obtained by reacting the above polyalkylene polyamine with an epoxy group, amide type polyamine compound obtained by reacting the above polyalkylene polyamine and carboxylic acid, above polyalkylene Polyamine and carboxylic acid, followed by reacting an amide adduct type modified amine obtained by reacting an epoxy group, the above diamine compound or polyalkylene polyamine compound, and a compound having a double bond conjugated with a carbonyl group or a nitrile group hand Michael addition-modified amines, and the like to be.

These compounds (C) can be used alone or in combination of two or more kinds. Further, these compounds (C) may be used in combination with the compound (D) having no primary amino group and having a secondary amino group.

Examples of such a compound (D) include the above-mentioned amino compound, diamine compound, amide type diamine compound, polyalkylene polyamine, adduct type modified amine or Michael addition type modified amine, and a carboxyl group and / or an epoxy group. A compound having a double bond conjugated with a carbonyl group or a nitrile group or a carboxyl group is reacted with a compound having a double bond conjugated with a carbonyl group or a nitrile group to completely amidate a primary amino group. Alternatively, a cyanoethylated compound and the like can be mentioned.

Among these, amide type modified amines, adduct type modified amines and amide adduct type modified amines are preferable from the viewpoint of low toxicity and excellent safety.
In carrying out the present invention, the amount of the compound (C) containing a primary amino group used is the equivalent number (E) of the epoxy groups in the formulation and the equivalent number (Cb) of the carbonate groups in the formulation. The ratio [H / (E + 2Cb)] of the active hydrogen equivalent number (H) of the amino group is 0.4
As described above, it is preferable to use it in the range of 1.5 or less from the viewpoint of excellent curability.

In carrying out the present invention, the curing temperature of the curable resin composition of the present invention is room temperature to 180 ° C., and the curing time is 30 minutes to 10 days. If you set the curing temperature higher, the curing time will be shorter,
The lower the curing temperature, the longer the curing time.

In carrying out the present invention, in addition to the curable resin composition of the present invention, a reactive and / or non-reactive diluent, a solvent, various pigments, various fillers, various additives may be used. The present invention is not impaired by using those materials.

[0027]

EXAMPLES Examples of the present invention and comparative examples for reference will be described below. Example 1 As an epoxy resin, a bisphenol A type epoxy resin (“EPICLON 8” manufactured by Dainippon Ink and Chemicals, Inc.)
50 ", epoxy equivalent 185 g / eq) 92.5 parts by weight, dimethyl carbonate as an alkyl carbonate (manufactured by Tokyo Kasei Co., Ltd., reagent first grade, carbonate equivalent 9
7.5 parts by weight of 0 g / eq) were thoroughly mixed. The viscosity of the mixture was 1010 cps / 25 ° C. A primary amino group-containing aliphatic polyamide (“EPICLON B-025” manufactured by Dainippon Ink and Chemicals, Inc., active hydrogen equivalent [H] = 115) was added to this mixture as a compound having a primary amino group in the molecular skeleton. 77 parts by weight was added and mixed well. 80 g of this base / hardener mixture is 100 ml
Take in a glass sample bottle, insert a thermometer, 25 ℃
Then, the curing exothermic curve was measured. The results are shown in Table 1.

Then, the above-mentioned base / curing agent mixture was degassed, poured into a glass mold and cured at room temperature for 7 days to obtain a casting plate of 30 cm × 30 cm × 3 mm. A test piece is cut out from this casting plate, and according to JIS K-6911,
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 1.

Example 2 As an epoxy resin, "EPICLON 850" 8
9.0 parts by weight, dibutyl carbonate as an alkyl carbonate (JP-rakt. Chem., [2] 2
2,353 (1880) as a reference. Boiling point 207
11.0 parts by weight of carbonate equivalent of 174 g / eq) was thoroughly mixed. The viscosity of the mixture is 990 cps / 25
It was ℃. A primary amino group-containing aliphatic polyamide (“EPICLON” manufactured by Dainippon Ink and Chemicals, Inc.) was added to this mixture as a compound having a primary amino group in the molecular skeleton.
B-025 ", 70 parts by weight of active hydrogen equivalent [H] = 115) were added and mixed sufficiently. 80 g of this base / curing agent mixture was placed in a 100 ml glass sample bottle, a thermometer was inserted, and the curing exothermic curve was measured at 25 ° C. The results are shown in Table 1.

Next, the above base resin / curing agent mixture was defoamed, poured into a glass mold and cured at room temperature for 7 days to obtain a casting plate of 30 cm × 30 cm × 3 mm. A test piece is cut out from this casting plate, and according to JIS K-6911,
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 1.

Example 3 As an epoxy resin, "EPICLON 850" 8
0.0 parts by weight, C ₁₂ ~ ₁₃ alcohol carbonic diester as alkyl carbonates (J.Prakt.Che
m., [2] 22,353 (1880) for reference. Boiling point 300 ° C or higher, carbonate equivalent 464 g / e
q) 20.0 parts by weight were mixed thoroughly. The viscosity of the mixture was 1030 cps / 25 ° C. A primary amino group-containing aliphatic polyamide (Dainippon Ink and Chemicals, Inc.) was added to this mixture as a compound having a primary amino group in the molecular skeleton.
59.6 parts of "EPICLON B-025" manufactured by Active Hydrogen Equivalent [H] = 115) were added and mixed sufficiently.
Take 80g of this base / curing agent mixture into a 100ml glass sample bottle, insert a thermometer, and at 25 ° C,
The curing exotherm curve was measured. The results are shown in Table 1.

Then, the above base / curing agent mixture was defoamed, poured into a glass mold and cured at room temperature for 7 days to obtain a casting plate of 30 cm × 30 cm × 3 mm. A test piece is cut out from this casting plate, and according to JIS K-6911,
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 1.

Example 4 86 parts of "EPICLON 850", 4.0 parts of dimethyl carbonate, and 10 parts by weight of "EPICLON 520" (glycidyl ether of alkylphenol of Dainippon Ink and Chemicals, Inc., epoxy equivalent: 235 g / eq) were added. , Mixed well. The viscosity of the mixture is 950 cps
/ 25 ° C. Add "EPICLON B" to this mixture.
-025 "68 parts by weight was added and mixed well, and Example 1
The curing exothermic curve was measured in the same manner as in. The results are shown in Table 1.

Then, a test piece was obtained in the same manner as in Example 1.
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 1.

Comparative Example 1 91 parts by weight of "EPICLON 850" and 9.0 parts by weight of butyl glycidyl ether (manufactured by Sakamoto Yakuhin Kogyo Co., Ltd., epoxy equivalent 130 g / eq) were sufficiently mixed. The viscosity of the mixture was 1020 cps / 25 ° C. To this mixture, 65 parts by weight of "EPICLON B-025" was added and mixed sufficiently, and the curing exothermic curve was measured in the same manner as in Example 1. The results are shown in Table 1.

Then, a test piece was obtained in the same manner as in Example 1,
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 1. Comparative Example 2 100 parts by weight of "EPICLON 850" (viscosity 13
000 cps), "EPICLON B-025"
62 parts by weight were added and mixed well, and the curing exothermic curve was measured in the same manner as in Example 1. The results are shown in Table 1.

Then, a test piece was obtained in the same manner as in Example 1,
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 1.

[0038]

[Table 1]

Example 5 91.5 parts by weight of "EPICLON 850" and 8.5 parts by weight of diethyl carbonate (manufactured by Tokyo Kasei Co., Ltd., first-grade reagent, carbonate equivalent 118 g / eq) were sufficiently mixed. The viscosity of the mixture was 1020 cps / 25 ° C. This mixture was mixed with "EPICLON EXB-609.
0 "[prototype manufactured by Dainippon Ink and Chemicals, Inc. (EPICLON 850 adduct of meta-xylene diamine) active hydrogen equivalent [H] = 52] 33 parts by weight was added and mixed sufficiently, and the same as in Example 1. The curing exotherm curve was measured. The results are shown in Table 2.

Then, a test piece was obtained in the same manner as in Example 1.
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 2. Example 6 83 parts by weight of "EPICLON 850" and 17 parts by weight of diethyl carbonate were sufficiently mixed. The viscosity of the mixture was 200 cps / 25 ° C. To this mixture was added 25 parts by weight of metaxylenediamine, and the mixture was mixed well and the curing exothermic curve was measured in the same manner as in Example 1. Second result
Shown in the table.

Then, a test piece was obtained in the same manner as in Example 1.
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 2. Comparative Example 3 92 parts by weight of "EPICLON 850" and 8 parts by weight of butyl glycidyl ether were sufficiently mixed. The viscosity of the mixture was 1200 cps / 25 ° C.

To this mixture was added "EPICLON EXB-
6090 "29 parts by weight were added and mixed thoroughly.
The curing exothermic curve was measured in the same manner as in. The results are shown in Table 2.

Then, a test piece was obtained in the same manner as in Example 1.
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 2. Comparative Example 4 83 parts by weight of "EPICLON 850" and 17 parts by weight of butyl glycidyl ether were sufficiently mixed. The viscosity of the mixture was 200 cps / 25 ° C.

20 parts by weight of metaxylenediamine was added to this mixture and mixed well, and the curing exothermic curve was measured in the same manner as in Example 1. The results are shown in Table 2. Then, a test piece was obtained in the same manner as in Example 1, and the heat distortion temperature, bending strength,
Flexural modulus, tensile strength, tensile modulus, and tensile elongation were measured. The results are shown in Table 2.

[0045]

[Table 2]

Example 7 96 parts by weight of bisphenol F type epoxy resin ("EPICLON 830" manufactured by Dainippon Ink and Chemicals, Inc., epoxy equivalent 173 g / eq), dimethyl carbonate 4
Parts by weight were mixed well. The viscosity of the mixture is 980 cps
/ 25 ° C. Add this mixture to the "EPICLON E
XB-6090 ”34 parts by weight was added and mixed well, and the curing exothermic curve was measured in the same manner as in Example 1. The results are shown in Table 3.

Then, a test piece was obtained in the same manner as in Example 1,
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 3.

Example 8 99 parts by weight of "EPICLON 830" and 1 part by weight of diethyl carbonate were thoroughly mixed. The viscosity of the mixture was 2400 cps / 25 ° C. Add "EP
31 parts by weight of "ICLON EXB-6090" was added and mixed sufficiently, and the curing exothermic curve was measured in the same manner as in Example 1. The results are shown in Table 3.

Then, a test piece was obtained in the same manner as in Example 1.
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 3.

Example 9 99 parts by weight of "EPICLON 830" and 1 part by weight of dibutyl carbonate were added and mixed sufficiently. The viscosity of the mixture was 2700 cps / 25 ° C. To this mixture, 30 parts by weight of "EPICLON EXB-6090" was added, mixed well, and the curing exothermic curve was measured in the same manner as in Example 1. The results are shown in Table 3.

Then, a test piece was obtained in the same manner as in Example 1,
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 3.

Comparative Example 5 "EPICLON 830" 96 parts by weight, "EPICLON 830"
4 parts by weight of LON 520 "were mixed thoroughly. The viscosity of the mixture was 1900 cps / 25 ° C. To this mixture, 31 parts by weight of "EPICLON EXB-6090" was added and mixed well, and the curing exothermic curve was measured in the same manner as in Example 1. The results are shown in Table 3.

Then, a test piece was obtained in the same manner as in Example 1,
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 3. Comparative Example 6 "EPICLON 830" 99 parts by weight, "EPICON 830"
1 part by weight of LON 520 ”was mixed thoroughly. The viscosity of the mixture was 3000 cps / 25 ° C. To this mixture, 30 parts by weight of "EPICLON EXB-6090" was added and mixed well, and the curing exothermic curve was measured in the same manner as in Example 1. The results are shown in Table 3.

Then, a test piece was obtained in the same manner as in Example 1.
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 3.

[0055]

[Table 3]

Example 10 "EPICLON 830" (95.5 parts by weight) and diethyl carbonate (4.5 parts by weight) were sufficiently mixed. The viscosity of the mixture was 1030 cps / 25 ° C. Metaxylene diamine (Mitsubishi Gas Chemical Co., Ltd. [H]
= 34) 21 parts by weight was added and mixed sufficiently, and the curing exothermic curve was measured in the same manner as in Example 1. The results are shown in Table 4.

Then, a test piece was obtained in the same manner as in Example 1.
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 4.

[0058] Example 11 "EPICLON 830" 87.0 parts, C ₁₂ ~ ₁₃ carbonic acid diester alcohol 13.0 used in Example 3
Parts were added and mixed well. The viscosity of the mixture is 970 c
It was ps / 25 ° C. Add "EPICLON" to this mixture.
27.6 parts by weight of "EXB-6090" was added and mixed sufficiently, and the curing exothermic curve was measured in the same manner as in Example 1. The results are shown in Table 4.

Then, a test piece was obtained in the same manner as in Example 1,
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 4.

Comparative Example 7 100 parts by weight of "EPICLON 830" (viscosity 33
20 parts by weight of meta-xylenediamine was added to 50 cps / 25 ° C.), mixed sufficiently, and the curing exothermic curve was measured in the same manner as in Example 1. The results are shown in Table 4.

Then, a test piece was obtained in the same manner as in Example 1.
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 4.

[0062]

[Table 4]

Example 12 92.5 parts by weight of "EPICLON 850" and 7.5 parts by weight of dimethyl carbonate were sufficiently mixed. The viscosity of the mixture was 1010 cps / 25 ° C. To this mixture, 39 parts by weight of "EPICLON B-025" was added and mixed sufficiently, and the curing exothermic curve was measured in the same manner as in Example 1. The results are shown in Table 5.

Then, a test piece was obtained in the same manner as in Example 1,
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 5.

Example 13 92.5 parts by weight of "EPICLON 850" and 7.5 parts by weight of dibutyl carbonate were sufficiently mixed. The viscosity of the mixture was 2000 cps / 25 ° C. 67 parts by weight of "EPICLON B-025" was added to this mixture and mixed sufficiently, and the curing exothermic curve was measured in the same manner as in Example 1. The results are shown in Table 5.

Then, a test piece was obtained in the same manner as in Example 1.
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 5.

Comparative Example 8 "EPICLON 850" 92.5 parts by weight, "EP
7.5 parts by weight of ICLON 520 "was mixed thoroughly.
The viscosity of the mixture was 5000 cps / 25 ° C. To this mixture, 31 parts by weight of "EPICLON B-025" was added and mixed sufficiently, and the curing exothermic curve was measured in the same manner as in Example 1. The results are shown in Table 5.

Then, a test piece was obtained in the same manner as in Example 1,
The heat deformation temperature, bending strength, bending elastic modulus, tensile strength, tensile elastic modulus, and tensile elongation were measured. The results are shown in Table 5.

[0069]

[Table 5] Next, the safety of some of the reactive diluents used in the above Examples and Comparative Examples was measured according to LD50.
The results are shown in Table 6.

[0070]

[Table 6]

[0071]

According to the present invention, an epoxy resin composition having low viscosity, excellent workability, and high safety for workers, and a cured product having excellent mechanical strength can be obtained. Therefore,
The composition of the present invention is very useful for applications such as paints, insulation, adhesion and casting.

Claims (10)

[Claims] 1. An epoxy resin composition comprising (A) an epoxy resin and (B) an alkyl carbonate. 2. The epoxy equivalent of the epoxy resin (A) is 1
The composition according to claim 1, which is from 00 to 5000 g / eq. 3. The composition according to claim 2, wherein the epoxy resin (A) is a bisphenol type epoxy resin. 4. The composition according to claim 1, 2 or 3, wherein the carbonate equivalent of the alkyl carbonate (B) is 600 to 76 g / eq. 5. The compounding ratio of the epoxy resin (A) and the alkyl carbonate (B) is (A) / (B) = on a weight basis.
The composition according to claim 1, 2, 3 or 4, which is 60/40 to 99/1. 6. An epoxy resin composition containing (A) an epoxy resin and (B) an alkyl carbonate,
(C) A cured product of an epoxy resin composition obtained by adding a compound having a primary amino group in its molecular skeleton. 7. The epoxy equivalent of the epoxy resin (A) is 1
The cured product according to claim 6, which is from 00 to 5000 g / eq. 8. The cured product according to claim 7, wherein the epoxy resin (A) is a bisphenol type epoxy resin. 9. The cured product according to claim 6, 7 or 8, wherein the carbonate equivalent of the alkyl carbonate (B) is 600 to 76 g / eq. 10. The compounding ratio of the epoxy resin (A) and the alkyl carbonate (B) is (A) / (B) on a weight basis.
= 50/50 to 99/1, and the compounded amount of the compound (C) having a primary amino group in the molecular skeleton thereof satisfies the following formula (1): cured product according to claim 6, 7, 8 or 9. . 0.3 ≤ [H / (E + 2Cb)] ≤ 1.5 (1 formula) (wherein, H is the equivalent number of active hydrogen in the compound (C), E
Is the equivalent number of epoxy groups in the epoxy resin (A), Cb is the equivalent number of carbonate groups in the alkyl carbonate (B))