JP2005307076A - Over coating composition for epoxy lining - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an over coating composition for an epoxy lining, which adds excellent acid-resistance to a corrosion resistant lining material coated to protect a concrete structure in a water treating facilities, an agricultural drainage facilities, sewage treating facilities and the like. <P>SOLUTION: The over coating composition for an epoxy lining comprises bisphenol A type epoxy resin, a polyester resin consisting of carboxylic acids containing aromatic dicarboxylic acid as a necessary component and alcohols containing alkylene oxide of bisphenol A as a necessary component, an amine-based curing agent containing an alicyclic hydrocarbon, a filler, a dilutant, a thixotropic agent, wherein the viscosity of the epoxy resin is 5,000-50,000 mPa s and the thixotropy is 3-8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an anticorrosion lining material composition that requires acid resistance for coating concrete structures such as water treatment facilities, agricultural settlement drainage facilities, sewerage treatment facilities for protection, and more specifically, an epoxy lining topcoat composition Related to things.

  Conventionally, epoxy resins, vinyl ester resins, non-styrene vinyl ester resins, urethane resins, silicon resins, and the like have been used as resins for anticorrosion lining materials. These have the usability peculiar to resin, and epoxy resin has been used as the most general-purpose resin among them. The concrete structure is newly established, and the concrete surface is rough.In addition, when renovating water treatment facilities, agricultural settlement drainage facilities, sewerage treatment facilities, etc., the deteriorated concrete surface layer is shaved with a sander, etc. In general, after mortar finishing, rough surface coating or uneven surface adjustment treatment, anti-corrosion lining coating for surface finishing was performed.

  As an anticorrosion lining material for this concrete structure, a step of applying a base material composed of an epoxy resin and a modified polyamidoamine-based curing agent, and a step of applying an overcoat material composed of an epoxy resin and a polythiol-modified aliphatic polyamine-based curing agent. Proposal for forming coating film (Patent Document 1), Proposal of anti-corrosion top coating material consisting of liquid epoxy resin, hardener, ceramic powder, fibrous clay mineral and short carbon fiber (Patent Document 2), water-dispersible epoxy resin Of acid-resistant paint for use in anticorrosive clothing of cementitious structures using water-setting alumina and water blend (Patent Document 3), epoxy resin having one or more epoxy groups in one molecule, and amine curing agent Paint containing 1 to 30 parts by weight of water per 100 parts by weight of solid content of organic solvent-type or solvent-free type paint containing as a resin component Proposal of a composition (Patent Document 4) has been made.

According to the Japan Sewerage Corporation's concrete anticorrosion guidelines, anticorrosion lining materials are classified from A type to D type construction methods according to the anticorrosive environmental conditions. The anticorrosiveness incorporates in the new guidelines the penetration depth of sulfur into the lining material coating film by sulfuric acid and sulfurous acid generated from sewage. For example, in the above-mentioned C type, the sulfur penetration depth with respect to the design coating film thickness is measured using EPMA (electroprobe microanalyzer), and is 200 μm and 10% or less with respect to the film thickness of the top coating material. And 5% or less with respect to the film thickness of the overcoat material. The anticorrosion guideline for agricultural settlement drainage is a guideline that strengthens the anticorrosion (acid resistance) standard of the topcoat compared with the visual check of the lining material coating film after the acid resistance test.
JP-A-7-171492 JP-A-9-263467 JP 2000-119592 A JP 2001-002986 A

  Under such circumstances, the provision of an agricultural settlement drainage system and an anticorrosion lining material composition that satisfies the concrete anticorrosion guidelines of the Japan Sewerage Corporation, particularly an epoxy lining topcoat material composition.

  As a result of intensively studying the coating material in solving the above-mentioned problems, the present inventors use a bisphenol A type epoxy resin as the epoxy resin of the top coating material, and a carboxylic acid having an aromatic dicarboxylic acid and bisphenol A. It has been found that a polyester resin composed of an alcohol having an alkylene oxide as an essential component is used, and an amine curing agent containing an alicyclic hydrocarbon is used as the amine curing agent. More specifically, it has been found that the viscosity of the epoxy resin blended as described above is 5,000 to 50,000 mPa · s, and thixotropic (hereinafter referred to as TI value) 3 to 8 is effective. It has been found that a coating film excellent in acid resistance, adhesive strength, and corrosion resistance can be obtained by combining this with an amine curing agent. It is found that the base lining material, the primer material, and the top coating material are sequentially applied when the coating film is dried, thereby being an epoxy lining material having excellent adhesion with concrete and high corrosion resistance. The present invention has been completed.

That is, the present invention
(1) An epoxy lining topcoat composition comprising an epoxy resin, a polyester resin, an amine curing agent, a filler, a diluent, and a thixotropic agent.
(2) The topcoat material composition for epoxy lining is characterized by having a viscosity of 5000 to 50000 mPa · s and a thixotropic property (TI value) of 3 to 8.
(3) The topcoat composition for epoxy lining consists of 20-74.9% by weight of epoxy resin, 5-40% by weight of polyester resin, 15-60% by weight of filler, 5-20% by weight of diluent, and thixotropic agent. It is a composition obtained by mixing 25 to 100% by weight of an amine curing agent with 100% by weight of the total amount of the main agent composed of 0.1 to 1% by weight.
(4) The epoxy resin is preferably a bisphenol A type epoxy resin.
(5) The polyester resin is preferably a polyester resin composed of a carboxylic acid essential for aromatic dicarboxylic acid and an alcohol essential for bisphenol A alkylene oxide.
(6) The amine curing agent preferably contains an alicyclic hydrocarbon.
(7) An epoxy lining material having a three-layer structure in which the epoxy lining topcoat composition is combined with a base material and a primer.

  The epoxy lining topcoat of the present invention has a sulfur penetration depth of C (10% or less of the design thickness and 200 μm or less) and D (design), which are considered difficult with conventional epoxy lining topcoats. Clear 5% or less of thickness and 100 μm or less) and has excellent anticorrosion properties. Thereby, the utility value in the field of acid-proofing and anti-corrosion lining applied to protect concrete structures such as water treatment facilities, agricultural settlement wastewater facilities, and sewerage treatment facilities is extremely high.

Hereinafter, the composition of the present invention will be described in detail.
As the epoxy resin used in the present invention, known epoxy resins can be used. Specifically, for example, bisphenol compounds such as bisphenol A and bisphenol F, polyphenols such as resorcin and hydroquinone, phenol novolac, cresol and the like. Those derived from polyphenolic compounds such as novolak and epichlorohydrin: polyhydric alcohols such as butanediol, hexanediol, neopentyl glycol, trimethylolpropane, glycerin, pentaerythritol, diethylene glycol, polyethylene glycol, dipropylene glycol, polypropylene glycol and the like Derived from epichlorohydrin: 3,4-epoxycyclohexylmethyl (3,4-epoxycyclohexane) carboxylate Alicyclic epoxy compounds such as 3,4-epoxy-6-methylcyclohexylmethyl (3,4-epoxy-6-methylcyclohexane) carboxylate, phthalic acid, terephthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid, trimellit Derived from polyvalent carboxylic acids such as acids, hydroxycarboxylic acids such as oxybenzoic acid and oxynaphthoic acid and epichlorohydrin: polyvalent amine compounds such as aniline, phenylenediamine and diaminodiphenylmethane, and aminophenols and aminocresols Those derived from hydroxyamino compounds such as epichlorohydrin. In addition, examples of the epoxy resin include a polyurethane skeleton and a polybutadiene skeleton, and a compound in which a plurality of epoxy groups are bonded to a part of a molecule, an epoxy compound having a hydantoin ring, and the like.

  These epoxy resins may be used alone or in combination of two or more. Among these, a preferable epoxy resin is preferably a bisphenol A type having an epoxy equivalent of 170 to 250 which is liquid at normal temperature in terms of viscosity, economy and anticorrosion. The amount used is 20 to 74.9% by weight in 100% by weight of the total amount of the main agent, and if it is within this range, workability is good and corrosion resistance can be exhibited.

  The polyester resin used in the present invention can be a known polyester resin, and is obtained by condensation polymerization of a known dicarboxylic acid and a known glycol. For example, dicarboxylic acids include succinic acid, glutaric acid, adipic acid, sebacic acid, dodecanedicarboxylic acid, azelaic acid and other aliphatic dicarboxylic acids, 1,4-cyclohexanedicarboxylic acid, 1.3-cyclohexanedicarboxylic acid, 1.2 -Cyclohexanedicarboxylic acid, 3-methylhexahydrophthalic anhydride, 4-methylhexahydrophthalic anhydride, dicarboxy water-added bisphenol A, water-added dimer acid, water-added naphthalene dicarboxylic acid, tricyclodecane carboxylic acid, etc. And aromatic dicarboxylic acids such as aromatic dicarboxylic acids, terephthalic acid, isophthalic acid, orthophthalic acid, and 2,6-naphthalenedicarboxylic acid.

  Glycol is ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, polytetraethylene glycol, 1,3-propanediol, 1.4-butanediol, 1,5-pentanediol, neopentyl Glycol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 2-methyl-1,5-pentanediol, 2,2-diethyl-1,3-propanediol, 2-butyl-2-ethyl -1,3-propanediol, 1,9-nonanediol, 1,10-decanediol and other alkylene glycols having 2 to 10 carbon atoms, trimethylolethane, trimethylolpropane, glycerin, pentaerythritol, polyglycerin Polyol, 1,4-Si B hexane dimethanol, 1,3-cyclohexane dimethanol, 1,2-cyclohexane dimethanol, an alicyclic glycol of hydrogenated bisphenol such as bisphenol A alkylene oxide such as aromatic systems.

  Among these, a preferable polyester resin is preferably a polyester essentially containing an aromatic dicarboxylic acid and a bisphenol A alkylene oxide for the purpose of improving acid resistance. The amount used is 5 to 40% by weight in 100% by weight of the total amount of the main agent, and if it is within this range, workability is good and corrosion resistance can be exhibited.

  As the filler used in the present invention, a known filler can be used, and specifically, titanium oxide, calcium carbonate, silica, talc, barium sulfate and the like can be used. Preferably, titanium oxide and barium sulfate are used in combination for the purpose of providing concealability and corrosion resistance. More preferably, titanium dioxide is used from the viewpoint of hiding properties and the prevention of choking of the coating layer, and barium sulfate used is precipitated barium sulfate used for imparting corrosion resistance. The blending ratio of both is not particularly limited, but it is preferable to use in the range of 1: 3 to 3: 1. The amount used is 15 to 60% by weight in 100% by weight of the total amount of the main agent. Within this range, workability is good and adhesion can be maintained.

  As the diluent used in the present invention, a known epoxy resin diluent can be used. Specifically, for example, a reactive diluent having one epoxy group, an aromatic diluent, a solvent, etc. Can be mentioned. Preferably, aliphatic and aromatic epoxy equivalents having 12 to 13 carbon atoms having an epoxy equivalent weight of 170 to 250 are used. Two types of combined use are preferable from the viewpoint of viscosity reduction and curing speed control of the epoxy resin compound. Although this reactive diluent compounding quantity is not specifically limited, it is 5 to 20 weight% in 100 weight% of the main ingredient total. Further, the blending ratio of the aliphatic type and the aromatic type is not particularly limited, but it is preferable to use the aromatic type in a range of 1: 4 to 1: 1. In this case, the use of a large number of aliphatic types is effective in reducing the viscosity, and conversely, the use of a large number of aromatic types tends to increase the viscosity, thus increasing the curing rate. Moreover, you may use another diluent in the range which does not affect a physical property as needed.

  As the thixotropic agent used in the present invention, a known thixotropic agent can be used. Specifically, for example, those having a shape in which flaky crystal discs such as organic bentonite, clay and mica powder are laminated and oxidized Examples include those that adsorb to the surface of a filler such as polyethylene and impart thixotropic properties. Among them, organic bentonite is suitable because it can provide a high thixotropic effect when incorporated in a small amount. This layer-like thixotropic agent is preferably used in a swollen state with an organic solvent such as propylene carbonate and toluene. By blending 0.1 to 1% by weight as a solid content in 100% by weight of the main agent total, high thixotropic properties (high TI Value).

  The amine curing agent to be added in an amount of 25 to 100% by weight based on 100% by weight of the total amount of the main agent composed of these epoxy resin, polyester resin, filler, diluent and thixotropic agent includes curing speed, coating film curing coating. A modified alicyclic polyamine-based curing agent having an amine value of 300 to 380 is suitable from the viewpoint of film hardness, coating film fogging, corrosion resistance, and the like. Incidentally, different amine values may be used depending on the season, and a diluent such as benzyl alcohol may be used for viscosity adjustment.

  In addition, silane coupling agents, antifoaming agents, pigments, and thickeners can be used as necessary. Examples of the silane coupling agent include amino type, ureido type, vinyl type, methacrylic type, epoxy type, mercapto type, isocyanate type, polymer type, and cationic type silane coupling agent, depending on the type of functional group. Among these, an epoxy-based silane coupling agent is suitable from the viewpoint of storage stability because it is blended with an epoxy resin, and is effective for improving the adhesion to an inorganic material. Although it does not specifically limit, it is good to use about 0.1 to 2 weight% in 100 weight% of the main ingredient total. The epoxy resin blend used in the present invention is obtained by sequentially stirring and mixing a reactive diluent, a silane coupling agent, and optionally other diluents to the epoxy resin.

The epoxy resin main compound blend prepared as described above has a viscosity of 5000 to 50000 mPa · s (BH type rotational viscometer, No4 rotor × 2 rpm, measurement temperature 25 ° C.), TI value of 3 to 8 (BH type rotational viscometer, No7). Rotor × 2 rpm / 20 rpm viscosity ratio, measurement temperature 25 ° C.). Of these, low viscosity and high thixotropic properties are preferred from the viewpoints of coating workability and sagging. When the viscosity is 5000 mPa · s and the TI value is 3 or less, the viscosity is further lowered by the addition of the amine-based curing agent. Conversely, when the viscosity is 50000 mPa · s and the TI value is 8 or more, it is difficult to apply even if an amine-based curing agent is blended.
The epoxy lining material composition thus obtained is used by weighing and mixing a predetermined amount of the epoxy resin compound and the amine curing agent immediately before the coating operation. The epoxy lining material is formed in a three-layer structure. The coating method for each layer is as follows. First, apply a substrate preparation material using a scissors, leave it overnight and check the cured state of the coating film with a finger, then apply a primer with a felt roll. To do. Similarly to the above, after confirming the cured state, the top coat material is applied using a felt roll. The top coat material may be overcoated by the same method as described above in accordance with the type of the anticorrosive environmental conditions.

  As described above, by using the topcoat material of the present invention in combination with a base material and a primer material for epoxy lining material, the method for preventing corrosion of agricultural drainage facilities for agriculture, and the epoxy resin coating according to the guidelines for concrete corrosion protection by the Japan Sewerage Corporation. It is possible to provide an epoxy lining material having adhesive strength and corrosion resistance suitable for any method under the anticorrosive environmental conditions by the method.

Hereinafter, the present invention will be described in more detail with reference to production examples and examples, but the present invention is not limited thereto.
[Production Example 1]
Adjustment of substrate conditioner:
Epoxy R-140C (Mitsui Chemical Co., Ltd., bisphenol A type, epoxy equivalent 195 to 215, total chlorine content 1.0 to 2.0%, viscosity 15,000 to 25,000 mPa · s) as an epoxy resin In 100 parts by weight, 7 parts by weight of Adekaglycilol ED-518 (Asahi Denka Kogyo Co., Ltd., aliphatic epoxy reactive diluent, epoxy equivalent 220, viscosity 5 mPa · s), Adekaglycilol ED-509 (Asahi) 20 parts by weight, manufactured by Denka Kogyo Co., Ltd., aromatic epoxy reactive diluent, epoxy equivalent 210, viscosity 20 mPa · s) (Shin-Etsu Silicon KBM403, manufactured by Shin-Etsu Chemical Co., Ltd., epoxy-based silane coupling agent ) And 0.5 part by weight of Glycosolv DM (Mitsui Chemicals Co., Ltd., methyl carbitol) are mixed with stirring. To obtain things.

  Adeca Hardener EH-4227 (manufactured by Asahi Denka Kogyo Co., Ltd., modified aliphatic polyamine type, amine number 190, viscosity 5,000 mPa · s, solid content 70%) as an amine-based curing agent, 100 parts by weight of New Coal 714 (Japan) 20 parts by weight of a polyoxyethylene polycyclic phenyl ether nonionic surfactant manufactured by Emulsifier Co., Ltd. and 280 parts by weight of water were stirred and emulsified to obtain an amine curing agent emulsion.

  As an aggregate, 100 parts by weight of No. 6 cinnabar sand, 30 parts by weight of Portland cement, 1.5 parts by weight of fumed silica, and 1.5 parts by weight of sepiolite as a fibrous clay mineral are uniformly stirred to obtain an aggregate premix. It was.

10 parts by weight of the epoxy resin compound and 40 parts by weight of the amine-based curing agent emulsion were mixed with stirring with respect to 100 parts by weight of the aggregate premix to obtain a base material adjusting material.
[Production Example 2]
Preparation of primer material Epoxy R-140C, 100 parts by weight, Epomic R-301X70 (Mitsui Chemical Co., Ltd., bisphenol type, epoxy equivalent of 640-720 70% used as a base material as an epoxy resin 10 parts Adekaglycilol ED-502 (Asahi Denka Kogyo Co., Ltd., Aliphatic Epoxy Reactive Diluent, Epoxy Equivalent 320 Viscosity 10 mPa · s) in 15 parts by weight of xylene solution, viscosity (Gardner) X to Z) Parts by weight, 40 parts by weight of Taipei R-930 (Ishihara Sangyo Co., Ltd., titanium dioxide), 30 parts by weight of precipitated barium sulfate # 100 (manufactured by Sakai Chemical Co., Ltd., barium sulfate), ET6N109 black (Daiichi Seikagaku) Manufactured, carbon black epoxy resin paste) 1.0 parts by weight, BYK-057 (Bic Chemie Japan Co., Ltd.), butadiene Solvent naphtha, propylene glycol monomethyl ether acetate solution) 1 part by weight of polymer, by blending 8 parts by weight of xylene, after thoroughly stirring and mixing with a disper to obtain a kneaded primer for epoxy resin mixture in three.

Adeka Hardener EH-4227 as amine-based curing agent, 100 parts by weight, New Coal 714.2 parts by weight, water 100 parts by weight, BYK-020 (produced by BYK Japan KK, ethylene glycol monobutyl of organically modified polysiloxane) (Ete, 2-ethylhexanol, mineral spirits solution) 1 part by weight was stirred and emulsified to obtain an amine-based curing agent emulsion. A primer material was prepared by blending 100 parts by weight of the epoxy resin blend with 100 parts by weight of an amine curing agent emulsion.
Adjustment of top coating material [Production Example 3-1]
Topcoat material: Epoxy R-140C (Mitsui Chemicals Co., Ltd.) 100 parts by weight on epoxy resin Adeka Resin ED-529 (Asahi Denka Kogyo Co., Ltd., aromatic epoxy reactive diluent, epoxy equivalent 180 viscosity 20 mPa · 34 parts by weight of s), 35 parts by weight of Byron 296 (manufactured by Toyobo Co., Ltd., non-crystalline polyester resin) as the polyester resin, and 32 parts by weight of Taipei R-930 (titanium oxide; manufactured by Ishihara Sangyo Co., Ltd.) as the filler And 25 parts by weight of sedimentary barium sulfate # 100 (manufactured by Sakai Chemical Co., Ltd.), Benton # 27 (made by Elementis Japan Co., Ltd., organic bentonite, average particle size of 10 μm or less, density 1.8 g / cm ³⁾ 2.3 parts by weight, the pigment in the ET-6N-109 black, manufactured by (carbon black epoxy resin paste Dainichi Seika Co.) 1.4 parts by weight, a defoaming agent BYK-057 (manufactured by BYK Chemie Japan KK) 1.1 blended parts by weight, after thoroughly stirring and mixing with a disper to obtain a main agent of the topcoat by kneading through three rolls. The viscosity was 8500 mPa · s and the TI value was 3.5.

  As an amine-based curing agent, ADEKA HARDNER EH-406A (manufactured by Asahi Denka Kogyo Co., Ltd., modified alicyclic polyamine system, amine value 350, viscosity 580 mPa · s) is mixed with 10 parts by weight of benzyl alcohol with stirring. Thus, an amine curing agent was obtained.

This was blended in an amount of 25 parts by weight with respect to 100 parts by weight of the epoxy resin composition as a top coating material. Incidentally, viscosity (BH type rotational viscometer, No4 rotor x 2 rpm, measurement temperature is 25 ° C) 2500 mPa · s, TI value (BH type rotational viscometer, No7 rotor x 2 rpm / 20 rpm viscosity ratio, measurement temperature is 25 ° C) 2. 3.
[Production Example 3-2]
Topcoat: Same as Production Example 3-1, except for Adequaridin ED-529 in Production Example 3-1, except that 34 parts by weight of MEK (methyl ethyl ketone) was used.
[Production Example 3-3]
Topcoat: Except for the polyester resin Byron 296 in Production Example 3-1, except that the polyester resin Byron EP2940 (manufactured by Toyobo Co., Ltd., epoxy-modified polyester resin) was 15 parts by weight, the same as in Production Example 3-1. It was adjusted.
[Production Example 3-4]
Top coating material: Except for the polyester resin Byron 296 in Production Example 3-1, the rest was adjusted in the same manner as in Production Example 3-1.
[Examples 1 to 3 and Comparative Example 1]
After the base material obtained in Production Example 1 and the primer material obtained in Production Example 2 are formed, each base material is coated on the base material prepared in Production Example 3-1 to Production Example 3-4. The properties (viscosity, storage stability, wrinkle elongation, roll coatability, sag, curability) were confirmed, and the results were displayed as shown below and shown in Table 1.

Application workability confirmation Viscosity ○… Within the range of 5000 to 12000 mPa · s
△… slightly out of range
×… Significantly out of range Storage stability ○… No abnormalities when left at 40 ° C for 7 days
△… with some separation
×… Large separation and sedimentation 鏝 Elongation ○… Lightly spread with plasterer
△… It grows when force is applied
×… Roll applicability that is difficult to stretch even if force is applied ○… Uniform application possible with felt rolls
△… Some streaks and sagging
×… Streaks, large dripping ○… No dripping after 2 minutes of application
△… Some drooping
×… Sagging Hardness ○… After 12 hours, it is dry to the touch and it is hard to stand your nails
△… Slightly tacky, scratching with nails
×… Soft and clearly uncured

  After the sharp corners of the cement mortar board specified in JIS K5410 are dropped with a sander, the front surface, back surface and both sides are sanded with sandpaper # 150, and the base material, primer material and topcoat material obtained in the production example After 12 hours of drying, each was applied in sequence, and the cement mortar board was completely covered to prepare a test body for adhesion and corrosion resistance test.

Specifically, as the substrate preparation material, 1.2 kg / m ² was uniformly applied using a plasterer and dried for 12 hours, and it was confirmed that the substrate was sufficiently dried (cured) by touch. Next, 0.15 kg / m ² of primer material is applied with felt rolls, dried for 12 hours to confirm the dry state, and the top coating material is dried by 0.24 kg (145 μm thick) / one time using the same brush as the primer. Was applied three times, and a coating film thickness of 430 μm was finished, cured at room temperature for 7 days, and finished with a lining to obtain a specimen for measuring physical properties.

This specimen was subjected to the following test, and the results are shown in Table 3.
Adhesive strength test Using a Kenken tensile tester (Oxjack Co., Ltd.), the plane tensile strength was measured and displayed in MPa.
Anticorrosion (1) Immerse in a 10% sulfuric acid solution at room temperature for 30 days to swell, wrinkle, soften, dissolve,
Observations such as whitening were made and displayed as follows.

○… No abnormality in each item
△… Some abnormalities exist depending on each item
X: Abnormality confirmed for each item (2) EPMA (manufactured by Shimadzu Corporation, EP) immersed in a 10% sulfuric acid solution at room temperature for 120 days
Using MA1610, an electron beam microanalyzer), the penetration depth of sulfur into the coating film was measured and displayed as the sulfur penetration depth (μ). (Small numbers indicate good corrosion resistance)
(3) Immerse in a 30% sulfuric acid solution at room temperature for 120 days, wipe it off, dry well at room temperature for 6 hours, measure the weight, and then calculate the weight after immersion-weight before immersion / weight before immersion x 100 The weight increase rate was expressed in (%). In this test, the sulfur content which penetrated into the specimen and increased was measured.

Claims (7)

  A top coating composition for epoxy lining comprising an epoxy resin, a polyester resin, an amine curing agent, a filler, a diluent, and a thixotropic agent.   The topcoat material composition for epoxy lining according to claim 1, having a viscosity of 5000 to 50000 mPa · s and a thixotropic property (TI value) of 3 to 8. Epoxy resin 20-74.9 wt%
Polyester resin 5-40% by weight
Filler 15-60% by weight
Diluent 5-20% by weight
Thixotropic agent 0.1-1% by weight
The top coating composition for epoxy lining according to claim 1 or 2, wherein 25 to 100% by weight of an amine curing agent is mixed with 100% by weight of the total amount of the main agent composed of   The said epoxy resin is a bisphenol A type epoxy resin, The topcoat material composition for epoxy linings in any one of Claims 1-3 characterized by the above-mentioned.   5. The epoxy according to claim 1, wherein the polyester resin is a polyester resin composed of a carboxylic acid essential for an aromatic dicarboxylic acid and an alcohol essential for an alkylene oxide of bisphenol A. 6. Lining topcoat composition.   The topcoat material composition for epoxy lining according to any one of claims 1 to 5, wherein the amine curing agent contains an alicyclic hydrocarbon. An epoxy lining material comprising a three-layer structure obtained by combining the topcoat material composition for epoxy lining according to any one of claims 1 to 6 with a substrate conditioner and a primer.