JP2681442B2 - Epoxy resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-component curing type epoxy resin composition used for decorative finishing of wall surfaces, floor surfaces or painted surfaces, and an epoxy resin composition exhibiting particularly excellent thixotropy. It is about things.

[0002]

2. Description of the Related Art In a two-component curing type epoxy resin composition applied on the surface of wall materials and floor materials, fine powder silica, fine powder calcium silicate, organic bentonite, and asbestos are used to impart thixotropic properties. Thixotropic agents such as powders, fibrous clay minerals, hardened castor oil and fatty acid bisamides are used.

For example, JP-A-3-172343 discloses that in a two-component curing type epoxy resin composition, a fine powder filler is contained as a thixotropic agent, and a high molecular weight polycarboxylic acid salt is mainly used as a curing agent. An epoxy resin composition containing an anti-sagging agent as a component is disclosed, and JP-A-3-84058 discloses that 1 part of an alkaline inorganic powder is added to 100 parts by weight of a liquid epoxy resin.
A thixotropic epoxy resin composition containing 0 to 200 parts by weight and 0.1 to 10 parts by weight of a dialkyltin laurate compound is disclosed.

[0004]

However, these thixotropic epoxy resin compositions are all related to thin thixotropic paints or inks, and such epoxy resin compositions have a particle size of 0.5 to 15 mm. When the gravel-like aggregate and the like were blended and used for thick coating, the workability was extremely poor because of sagging in the finishing of the vertical surface and the like.

When a large amount of a thixotropic agent such as finely powdered silica or finely powdered calcium silicate is used in order to solve such a problem, the viscosity of the composition rises at the same time that thixotropy appears. Therefore, the measurement of the blended components varies, and the stirring and mixing thereof are difficult.

On the other hand, when an organic substance such as castor oil hydrogenated oil or fatty acid bisamide is used as a thixotropic agent,
Since thixotropy is expressed by recrystallization or swelling, in order to obtain a composition having certain properties, it is difficult to control the temperature at the time of compounding, the compounding time, the stirring method, etc. When a large amount of the imparting agent is used, there is a problem that the adhesiveness is lowered. An object of the present invention is to provide an epoxy resin composition which is easy to measure, stir and mix, etc., and which is useful as a finishing material for wall surfaces, floor surfaces or painted surfaces.

[0007]

Means for Solving the Problems As a result of intensive studies conducted by the present inventors in view of such circumstances, as a result, an epoxy resin composition containing at least an epoxy resin, an epoxy curing agent and a thixotropic agent is sagged. By adding polyimines, polyols, or both of them as an inhibitor, it was found that excellent thixotropy can be expressed, and thereby no sagging occurs, and the present invention has been completed.

Typical examples of the epoxy resin used in the epoxy resin composition of the present invention include bisphenol A type, bisphenol F type and other bisphenol type epoxy resins, novolac type epoxy resins, straight-chain aliphatic epoxy resins and the like. Known epoxy resin, and a reaction diluent such as butyl glycidyl ether or a non-reaction diluent such as toluene, methyl ethyl ketone, benzyl alcohol or acetylacetone may be added if necessary.

Typical epoxy curing agents used in the epoxy resin composition of the present invention include aliphatic amines, alicyclic amines, aromatic amines, amide polyamines,
It is a known epoxy resin curing agent such as polyamine and Lewis base. The thixotropic agent contained in the epoxy resin composition of the present invention is a fine powder filler such as fine powder silica, organic bentonite, asbestos powder, and fibrous clay mineral.

Typical examples of the anti-dripping agent added to the epoxy resin composition of the present invention include polyimines such as polyethyleneimine and polypropyleneimine, and polyols such as polyethylene glycol, polypropylene glycol, polyethylene oxide and polyglycerin. And mixtures thereof, with polyimines being particularly preferred.

In the practice of the epoxy resin composition of the present invention, the amount of the dripping inhibitor added is preferably in the range of 0.01 to 50% by weight, based on the total amount of the main agent and curing agent used.
If it is less than 0.01% by weight, a sufficient thixotropic effect cannot be obtained, and if it exceeds 50% by weight, a sufficient thixotropic effect cannot be obtained and the physical properties after curing are deteriorated.
Moreover, in order to dilute the anti-sagging agent, lower alcohols such as methanol, ethanol, ethylene glycol and water may be added as necessary.

In carrying out the epoxy resin composition of the present invention, as a method of adding the dripping preventing agent, it may be added by adding it to either the main agent or the curing agent in advance. First, it is more preferable to uniformly stir and mix the main agent and the curing agent and then add the mixture to this mixture. Various additives such as other thixotropic agents, fillers, pigments, diluents, stabilizers, defoamers, and ultraviolet absorbers, in addition to any of the main agent and curing agent used in the epoxy resin composition of the present invention. There is no problem in blending.

When the epoxy resin composition of the present invention is used, it may be used as it is as a paint or an ink,
Further, an aggregate such as natural sand, quarry stone or cold water stone may be mixed with this epoxy resin composition, and the mixture obtained by stirring and mixing the epoxy resin composition may be applied to the wall surface or floor surface. Examples of the method for applying the epoxy resin composition of the present invention include trowel coating, roll coating, and spraying.

[0014]

EXAMPLES Hereinafter, according to Examples, Reference Examples and Comparative Examples,
The present invention will be specifically described. (Example 1) Bisphenol A type liquid epoxy resin [trade name: Epicoat 828, Yuka Shell Epoxy Co., Ltd.
80 parts by weight, epoxy resin diluent [trade name: Cardura E10, manufactured by Yuka Shell Epoxy Co., Ltd.] 20 parts by weight, benzyl alcohol 5 parts by weight, and ultrafine silica as a thixotropic agent [trade name: Reorosil QS102]. Tokuyama Soda Co., Ltd.] in an amount of 7 parts by weight, and this was uniformly stirred and mixed using an electric stirrer to prepare a main agent. On the other hand, polyethyleneimine [trade name: Epomin SP-20
0, manufactured by Nippon Shokubai Co., Ltd.] 20 parts by weight and methanol 80
An anti-sagging agent was prepared by uniformly mixing with stirring in a mixing ratio of 1 part by weight.

A modified polyamine [trade name: Daito Clar X-50 is used as a curing agent for 100 parts by weight of the above-mentioned main agent.
39, manufactured by Daito Sangyo Co., Ltd.] 40 parts by weight were blended and uniformly stirred and mixed, and 2 parts by weight of a dripping inhibitor was further added to this mixture, which was uniformly stirred and mixed to prepare an epoxy resin composition. Using the epoxy resin composition obtained in this way, 0.8
When applied at a rate of kg / m ² , dripping did not occur and the workability of trowel coating was good.

Reference Example 1 142 parts by weight of the epoxy resin composition obtained in Example 1 was added to 100 parts of a natural stone crushed product having an average particle size of 3 mm [dried gravel, manufactured by Nakasu Crushed Stone Co., Ltd.] 100
0 part by weight was further added and mixed uniformly to prepare a room temperature curing type epoxy resin-based coating material.

On the other hand, the epoxy resin composition obtained in Example 1 was used on a vertical concrete wall with a rubber trowel to make 0.8.
It was applied at a rate of kg / m ² , and the surface thereof was trowel-coated with a gold trowel so as to have a thickness of 3 to 5 mm in the uncured state.

Due to the excellent thixotropic property, no leaching was caused on the upright concrete wall surface, and the workability of trowel coating was good. The cured wall surface had good adhesiveness and the like, and a finished wall surface having a natural stone tone and rich in mass was obtained.

Reference Example 2 In Reference Example 1, a crushed natural stone having an average particle diameter of 5 mm was used as the aggregate instead of a crushed natural stone having an average particle diameter of 3 mm, and 1300 parts by weight of this crushed natural stone was used as in Reference Example 1. The mixture was mixed by the method of 1. to prepare a room temperature curing type epoxy resin-based coating material.

[0020] The epoxy resin composition obtained in Example 1 concrete horizontal plane 0.4 kg / m ^2, the inclined or rising surface is applied using a rubber trowel at a rate of 0.8 kg / m ² In addition, when the above epoxy resin coating material was applied to the surface in an uncured state using a metal iron so as to have a thickness of 8 to 10 mm, the horizontal surface as well as the inclined surface and the rising surface were good. A good paint finish was obtained.

Example 2 A room temperature curable epoxy resin composition was prepared in the same manner as in Example 1 except that polyethylene glycol was used as the anti-dripping agent. When the epoxy resin composition thus obtained was applied to an upright concrete wall surface in the same manner as in Example 1, no dripping was caused and the workability of trowel coating was good.

(Example 3) Except for Example 1 except that the anti-dripping agent was mixed with 10 parts by weight of polyethyleneimine, 10 parts by weight of polyethylene glycol and 80 parts by weight of methanol. Similarly, a room temperature curable epoxy resin composition was prepared. Example 1 using the epoxy resin composition thus obtained
When applied to an upright concrete wall surface in the same manner as
The workability of trowel coating was good without causing dripping.

Reference Example 3 Using the epoxy resin composition obtained in Example 2, an epoxy resin coating material was prepared under exactly the same conditions as in Reference Example 1 and applied to an upright wall surface. A good coated surface was obtained.

Comparative Example 1 A room temperature curable epoxy resin composition was prepared in the same manner as in Example 1 except that the anti-dripping agent was not used. Using this epoxy resin composition, an epoxy resin-based coating material was prepared in the same manner as in Reference Example 1, and it was attempted to apply this to an upright concrete wall surface. However, the coating material drips down and adheres evenly to the wall surface. I couldn't.

Comparative Example 2 A room temperature curable epoxy resin composition was prepared in the same manner as in Example 1 except that the anti-dripping agent was not used. Using this epoxy resin composition, an epoxy resin-based coating material was prepared in the same manner as in Reference Example 2, and was applied to a horizontal surface and a sloping surface made of concrete. However, the coating material drooped down and could not be adhered to the inclined surface where the inclination exceeded about 30 degrees.

[0026]

The epoxy resin composition of the present invention can exhibit excellent thixotropy even if the amount of the thixotropic agent added is small, and a coated surface can be obtained without sagging. Further, the coating material obtained by mixing the epoxy resin composition of the present invention with a gravel-like aggregate having a large particle size and a large specific gravity, when applied to an upright wall surface, an inclined floor surface, a rising floor surface, etc. It can be applied in a state where it does not occur, and a cosmetically finished surface with a rich aesthetic appearance can be formed.

Claims (1)

(57) [Claims] 1. An epoxy resin composition containing an epoxy resin, an epoxy curing agent, and a thixotropic agent, wherein polyimines, polyols, or both of them are blended as a dripping inhibitor. .