JP4541821B2 - Diluent for epoxy resin coating flooring - Google Patents

Description

  The present invention relates to a dedicated diluent for an epoxy resin-based flooring material and an epoxy resin-based flooring material diluted with the diluent.

  Epoxy resins are often used as on-site construction-type coating floor materials because of their high chemical resistance and versatility. Usually, an epoxy resin-based coating floor material is subjected to two-component mixing of an epoxy resin base and a curing agent immediately before construction at a construction site. At this time, it is common to dilute the epoxy resin base with a special solvent in advance, or dilute the epoxy resin base with a special solvent to the mixture of the epoxy resin base and the curing agent, and then apply. is there. In particular, in winter, the epoxy resin-based flooring material tends to have a high viscosity. Therefore, in order to facilitate the construction, it is necessary to dilute with an exclusive solvent.

  Conventionally, a mixture of toluene, xylene, and alcohol has been used as a dedicated solvent for diluting these epoxy resin-based flooring materials. For example, a diluent obtained by mixing toluene or xylene with a lower alcohol compound such as n-butanol can provide a sufficient dilution effect with a small amount of addition to the epoxy resin composition (base or / and curing agent). Therefore, it is excellent in workability and economical, and it has the characteristics that the compressive strength of the coated floor after construction is relatively difficult to be lowered, and finishes such as color separation which are very important are hardly generated.

  However, recently, volatile substances such as toluene and xylene emitted from buildings are considered to be causative substances for sick houses and sick schools, and the use of these substances has been regarded as a problem at construction sites. Furthermore, toluene and xylene are included in PRTR-designated substances and Ministry of Health, Labor and Welfare guideline-designated VOCs (volatile organic compounds), giving consideration to health for construction workers, managing the use and discharge of substances, In addition, there is a problem that requires regular indoor concentration measurement management in public buildings such as schools.

From such a viewpoint, a diluent such as a resin that does not use a specified substance such as toluene or xylene is desired. For example, Patent Document 1 discloses a) bisphenol A type epoxy resin and bisphenol F type epoxy resin, b) A higher alcohol diluent, c) a thixotropic agent composed of organic bentonite and finely divided silica, d) a mixture of a sufficient amount of a curing agent to cure a), and mixing the above components for use. A composition for lining the inner surface of a pipe characterized in that the viscosity immediately after is 1000 to 50000 cp and the thixotropic index range is 2.0 to 8.0, and as a diluent for the composition, b) It is disclosed that higher alcohol diluents are used.
JP-A-8-59662

Conventional diluents used to dilute epoxy resin-based flooring materials that do not contain toluene or xylene are those that have physical properties such as the compressive strength of the final flooring and color separation. It was not possible to be satisfied with the poor finish.
An object of the present invention is to provide a diluent for a field work type epoxy resin coating floor material that does not contain toluene or xylene that has a health and environmental problem while maintaining a dilution effect, and is formed It is to provide a coated floor satisfying the physical properties and finish.

  That is, the present invention provides a dedicated diluent for an epoxy resin-based coating floor material, which comprises a C7 or less alcohol.

  The present invention also provides a diluent for an epoxy resin-based coating material, which is a mixture of an alcohol having 7 or less carbon atoms and an ester compound having 10 or less carbon atoms.

  The diluent of the present invention is a dedicated diluent used for a two-component mixed epoxy resin coating floor material mixed with an epoxy resin base and a curing agent just before construction and used for construction, and is conventionally used. Compared with the diluent containing toluene and xylene, the dilution effect equivalent to or higher can be obtained. Furthermore, it is excellent in that the non-slip surface and the compressive strength can be maintained in finishing the painted floor after construction, and color separation does not occur. Moreover, since it is a low boiling point substance, the coated flooring material after construction can be dried in a short time, and the fear of the residue in a coated floor can also be reduced.

  Note that the upper and lower limits of the numerical range in the present invention are within the scope of the present invention as long as they have the same operational effects as those within the numerical range even if they are slightly outside the numerical range specified by the present invention. Is included.

  Embodiments of the present invention will be described below. However, the scope of the present invention is not limited to the embodiments described below.

  The diluent according to this embodiment is a diluent for epoxy resin-based coating flooring, and is a diluent made of alcohol having 7 or less carbon atoms.

The alcohol used in the present embodiment may be an alcohol having 7 or less carbon atoms (hereinafter referred to as a lower alcohol), and may be any of primary to tertiary alcohols. Examples include methanol, ethanol, n-propanol, n-butanol, n-pentanol, n-hexanol, isopropanol, isobutanol, t-butanol, benzyl alcohol and the like. Of these, methanol, ethanol, n-propanol, isopropanol, and n-butanol are preferable.
Further, the lower alcohol used in the present embodiment may be a mixture of two or more of the lower alcohols exemplified above, and is selected from methanol, ethanol, n-propanol, isopropanol, and n-butanol. Two or more types of mixtures are preferred. Also, denatured ethanol (denatured alcohol), which is a mixture of lower alcohols, can be selected.

  The purity of the lower alcohol may be a commercially available industrial grade or first grade or higher purity, and is preferably a special grade with higher purity. Generally, a lower alcohol has a high affinity with water, and it is difficult to avoid mixing water into the lower alcohol during storage and the like, and therefore it may contain moisture as an impurity so as not to inhibit the effects of the present invention. Other impurities may also contain impurities as long as they do not impair the effects of the present invention.

  The lower alcohol-based diluent according to the present embodiment can be added in a desired amount in advance to the epoxy resin base before construction, and can also be added in a desired amount when mixing the epoxy resin base and the curing agent immediately before use. . Among these, addition at the time of mixing is preferable because it is easy to adjust the viscosity of the epoxy resin-based coating floor material in accordance with the construction work contents during field work.

  Next, as a diluent according to the second embodiment of the present invention, a diluent obtained by mixing an alcohol having 7 or less carbon atoms and an ester compound having 10 or less carbon atoms will be described.

  The lower alcohol used in this embodiment is selected from the alcohols having 7 or less carbon atoms exemplified above. Moreover, you may use the mixture of 2 or more types of lower alcohol.

In addition, the ester compound used in the present embodiment may be an ester compound derived from monocarboxylic acid and dicarboxylic acid and having 10 or less carbon atoms, such as methyl acetate, ethyl acetate, isopropyl acetate, methyl propionate, Examples include ethyl propionate, methyl butyrate, isopropyl butyrate, isopentyl butyrate, ethyl caproate, diethyl oxalate, dimethyl malonate, diethyl malonate, dimethyl succinate, diethyl succinate, dimethyl glutarate, dimethyl adipate and the like. Of these, ethyl acetate, methyl propionate, and dimethyl succinate are preferable.
In addition, the ester compound used in the present embodiment can be mixed with two or more of the ester compounds exemplified above, among which two or more selected from ethyl acetate, methyl propionate, and dimethyl succinate. Is preferred.

  The purity of the ester compound may be an industrial grade or a first grade or higher purity that is generally commercially available, and is preferably a special grade having a higher purity. Further, impurities may be included as long as the effects of the present invention are not impaired.

  Further, the mixing ratio of the lower alcohol and the ester compound is preferably 10 to 100 parts by mass of the ester compound with respect to 100 parts by mass of the lower alcohol, and more preferably 15 to 70 parts by mass.

  Further, the lower alcohol and the ester compound-based diluent according to this embodiment can be added in a desired amount in advance to the epoxy resin base before construction, and further added in a desired amount when mixing the base and the curing agent immediately before use. You can also Among these, addition to the epoxy resin base before construction is preferable because the effect of preventing separation of components such as color pigments, particularly green color pigment components, is increased.

  Next, a method for using the lower alcohol diluent, the lower alcohol and the ester compound diluent according to this embodiment, and an epoxy resin coating floor material diluted with the diluent will be described.

What is necessary is just to adjust the addition amount of the diluent which concerns on this embodiment suitably according to the time of use, the field, and the construction content. Usually, 0.1 to 20 parts by mass is added to 100 parts by mass of the epoxy resin base to be used, and 0.1 to 5 parts by mass is particularly preferable.
When 0.1 to 20 parts by mass of the diluent according to this embodiment is added and diluted with respect to 100 parts by mass of the epoxy resin base, separation of each component constituting the epoxy resin base hardly occurs. In addition, when 0.1 to 20 parts by mass of the diluent according to the present embodiment is added to 100 parts by mass of the epoxy resin base and diluted with an epoxy resin base flooring material in which an epoxy resin base and a curing agent are mixed, field work Epoxy resin that is excellent in properties, can dry the coated flooring material after construction in a short time, is less worried about remaining in the painted floor, and has excellent physical properties such as compressive strength of the resulting coated floor A coating floor material can be obtained.

  The diluent according to this embodiment is added to the epoxy resin base or the epoxy resin-based flooring material diluted with the diluent according to this embodiment so that the viscosity at 23 ° C. is 100 to 10,000 mPa · s. It should be diluted. In particular, in consideration of use in winter, the present embodiment is such that the viscosity of the epoxy resin base or the epoxy resin coating floor material at 10 ° C. is about 100 to 4000 mPa · s, preferably about 100 to 3500 mPa · s. When diluted with the diluent according to the above, it is possible to obtain an epoxy resin-based flooring material that is economical in use, suitable for construction workability, and also has good physical properties.

Here, the epoxy resin base used in this embodiment is configured by mixing an epoxy resin, an inorganic filler, a pigment, and the like.
The epoxy resin is a compound having an epoxy group in the molecule and may be a generally known epoxy resin such as bisphenol A type or bisphenol F type. For example, Epicoat 825, Epicoat 828 (both manufactured by JSR), D.I. E. R. 331 (manufactured by Dow Chemical Company), Epicron 830, Epicron 840, Epicron 850 (all manufactured by Dainippon Ink and Chemicals), Adeka Resin EP-4100G, Adeka Resin EP-4901 (all manufactured by Asahi Denka), Epomic R110, Epomic R140 (Both manufactured by Mitsui Chemicals).

  Examples of the inorganic filler include generally known silica powder, silica sand, barite, and talc. An inorganic filler can mix | blend desired amount of the inorganic material according to the construction content as an inorganic filler or an aggregate. As the pigment, a generally known pigment can be blended according to the desired color of the floor.

The curing agent may be any generally known curing agent for epoxy resins such as amine compounds. For example, Adeka Hardener EH-461 (manufactured by Asahi Denka Co., Ltd.) and polyamidoamine 2386 (manufactured by Air Products Japan Co., Ltd.) can be mentioned, and they are selected in consideration of the use of the coated floor to be constructed, the required physical properties, and the like.
In addition, since the compounding ratio is usually set so that the curing agent has the same amount as the epoxy group that contributes to the reaction of the epoxy resin, the amount of the curing agent is appropriately determined according to the epoxy resin also in this embodiment. Should be set.

  The epoxy resin-based flooring material diluted with the diluent according to the present embodiment includes other compounds such as a curing accelerator and a stabilizer in addition to the epoxy resin base and the curing agent. May be.

The epoxy resin-based flooring material is prepared by mixing and preparing an epoxy resin base and a curing agent at the site immediately before the flooring construction, and using it for the flooring construction.
The epoxy resin coating floor material according to the present embodiment prepared in this way may be directly applied to the ground concrete, or may be applied as a finishing material for a coated floor subjected to primer treatment or the like. Moreover, it can apply | coat several times more than twice, and can also finish a coating floor.

  Examples of the present embodiment will be described below, but the present invention is not limited by these.

(Preparation of formulation sample)
Tables 1 and 2 with respect to 100 parts by mass of epoxy resin base (Chemcrete E base, manufactured by ABC Shokai) consisting of bisphenol A type epoxy resin, inorganic filler, coloring pigment, and other additives in a 10 ° C environment Or an alcohol and an ester compound were mixed in advance to prepare a blended product sample.

(Viscosity measurement)
Each of the prepared blend samples was stored for 24 hours in an environment of 10 ° C., and then the viscosity of the blend sample was measured using a B-type viscometer.

(Evaluation of workability and color separation of painted floor after construction 1)
Next, 20 parts by mass of 100 parts by mass of an epoxy resin base with a curing agent (Chemcrete E curing agent, manufactured by ABC Shokai Co., Ltd.) based on a modified aliphatic polyamine as a main component is stored in each compound sample stored for 24 hours in an environment of 10 ° C. Parts were mixed to make a coated flooring sample, and used for workability evaluation during construction.
As a method for evaluating workability, a primer composed of a base material mainly composed of bisphenol A type epoxy resin and a curing agent mainly composed of a modified aliphatic amine (Chemcreat Primer NS, manufactured by ABC Corporation) is applied to a concrete flat plate in advance. On the coated and cured coating film, each coated flooring material was applied for the first time using Kanagote in a 10 ° C. environment and stored for 24 hours. Further, the second application was performed in the same manner as the first application, and the film was cured for 7 days in an environment of 10 ° C.
The workability was evaluated comprehensively for the feel (workability) of the first and second application. Further, the appearance of the painted floor after curing was visually observed, and color separation evaluation (color separation evaluation 2) after the painted floor construction was performed.

(Evaluation of color separation in epoxy resin base 2)
Samples 7 and 8 were stored for 24 hours in a 10 ° C. environment, and then the components constituting the epoxy resin base, in particular, the color pigments, were visually observed to determine the epoxy resin base. The color separation evaluation (color separation evaluation 1) was performed.

Table 1 shows the results of color separation evaluation 1, viscosity, and workability evaluation for samples 1 to 6. It was found that Samples 1 to 4 to which a lower alcohol diluent having 7 or less carbon atoms was added had a diluting effect that gave workability equivalent to or higher than that of Sample 6 to which the same amount of toluene-based diluent used in the past was added. It was. Moreover, it turned out from the result of the color-separation evaluation 2 that the finish property of a good coated floor is given.
On the other hand, Sample 5 to which alcohol having 10 carbon atoms was added had inferior viscosity and workability compared to Samples 1 to 4 at the same addition amount, and the dilution effect was insufficient. Therefore, it was found that in the formulation of Sample 5, it was necessary to add a larger amount of diluent to the epoxy resin base.

Table 2 shows color separation evaluation 1, color separation evaluation 2, viscosity, and workability evaluation regarding samples 7 and 8. Samples 7 and 8 which are epoxy resin bases diluted with a lower alcohol and an ester compound-based diluent showed no separation of the components of the epoxy resin base including the pigment, and the color separation evaluation 1 The result was good.
In addition, it has a diluting effect that gives workability equivalent to or better than that of sample 6 to which the same amount of a diluent containing toluene that has been used in the past is added. I understood that.

Claims (3)

  A dedicated diluent for epoxy resin-based flooring materials, which is a mixture of alcohol having 6 or less carbon atoms and methyl propionate or dimethyl succinate, which is an ester compound having 10 or less carbon atoms. A diluent according to claim 1, diluents, characterized in that having 10 or less of the ester compound carbon is mixed 10-100 parts by weight per 100 parts by weight alcohol having 6 or less carbon atoms.   An epoxy resin-based coating material obtained by mixing 0.1 to 20 parts by mass of the diluent according to claim 1 or 2 with respect to 100 parts by mass of the epoxy resin base.