JP2002037833A - Two-part curing type urethane composition for civil engineering and construction use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composition for civil engineering and construction uses, capable of retaining low viscosity for a long time after mixing a base resin and a curing agent, excellent in a defoaming and a leveling properties and, in addition, excellent in general properties, the balance between strength and elongation, and heat and moisture resistance. SOLUTION: This two-part curing type urethane composition comprises the base resin containing, as a main component, an isocyanate-terminated prepolymer which is obtained by reacting a lower aliphatic polyol with a polyisocyanate. The curing agent consisting of, as main components, a diene- based liquid polymer polyol and a petroleum resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-part curable urethane composition for civil engineering and, more particularly, to an improvement of a diene-based liquid polymer polyol-based two-part curable urethane composition.

[0002]

2. Description of the Related Art Two-part curable urethane compositions for civil engineering are used as waterproofing materials, coated flooring materials, elastic pavement materials on rooftops, verandas, corridors, indoor and outdoor floors, factory floors, and various types of liquid storage. It is used in large quantities as heavy anticorrosion paint for tanks and the like. As the two-part curable urethane composition for civil engineering, a isocyanate-terminated prepolymer obtained by the reaction between a polyol and an aromatic isocyanate as a main component, and a composition containing a polyol in various additives as a curing agent. Liquid-curable urethane compositions are mainly used, and are roughly classified into polypropylene ether polyol-based urethanes and diene-based liquid polymer polyol-based urethanes depending on the type of polyol used.

[0003]

SUMMARY OF THE INVENTION Polypropylene ether polyols are used in large quantities as raw materials for urethane compositions for civil engineering because of their lower cost and lower viscosity than other polyols. The main uses of urethane compositions for civil engineering are rooftops of building, veranda,
Waterproofing of corridors, elastic pavement of sports facilities, painted floors inside and outside, etc., most of which are used as outdoor finishing materials. Under the above conditions, the urethane composition for civil engineering construction has high heat resistance and hydrolysis resistance because it is exposed to high temperature for a long time due to direct sunlight or immersed in water due to rain or the like. Hereinafter, these two types of durability are collectively referred to as heat and humidity resistance), but at present, sufficient heat and humidity resistance cannot be obtained with polypropylene ether polyol-based urethane.

[0004]

On the other hand, a urethane composition for civil engineering construction using a diene-based liquid polyol-based urethane as a raw material has a higher heat and humidity resistance than a polypropylene polyol-based urethane. Since it has a high viscosity and needs to be reinforced with a petroleum resin, there is a disadvantage that the viscosity of the curing agent and the mixture becomes high. For this reason, a problem arises in the defoaming property, a sufficient finish feeling cannot be obtained, and at present, the requirements as a finishing material are not satisfied. Furthermore, at a construction site, it is necessary to form a rubber-like coating film in as short a time as possible, and in the conventional technology, a method of accelerating the apparent curing has been adopted. Therefore, the NCO content in the main agent must be increased. Means of doing so have been used. As a result, the polyisocyanate monomer remains in a free state in the main agent, which inhibits the expression of the physical properties of the urethane composition, and at the same time lowers the working environment and defoams due to the vapor of the polyisocyanate monomer. It is also an obstacle to the workability and leveling property, which causes insufficient workability.

[0005]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems of the prior art, and as a result, have reached the present invention. That is, the present invention provides a two-component composition comprising a main component mainly composed of an isocyanate-terminated prepolymer obtained by reacting a low molecular weight aliphatic polyol with a polyisocyanate, and a curing agent mainly composed of a diene liquid polymer polyol and a petroleum resin. Provided is a liquid-curable urethane composition. In one preferred embodiment, the low-molecular aliphatic polyol has at least two hydroxyl groups bonded to a branched carbon chain having 5 to 20 carbon atoms in one molecule, or has 5 to 20 carbon atoms. It is a low molecular weight aliphatic polyol having at least two hydroxyl groups bonded at positions asymmetric with respect to a straight carbon chain. In another preferred embodiment, the polyisocyanate is any of aliphatic, cycloaliphatic, and aromatic polyisocyanates, and has two or less isocyanate groups in one molecule. In another preferred embodiment, the diene-based liquid polymer polyol is
It has an average molecular weight of 500-10000. In yet another preferred embodiment, the petroleum resin has a softening point of 60-180.
C. and an average molecular weight of 500-3000.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The isocyanate-terminated prepolymer used as a main component of the present invention is produced by reacting a polyisocyanate with a low molecular weight aliphatic polyol in an aromatic solvent. in this case,
In order to minimize the amount of polyisocyanate remaining in the free state in the obtained prepolymer, the charged polyisocyanate and the low molecular weight aliphatic polyol are mixed with NCO /
It is desirable to carry out the reaction by charging so that the equivalent ratio of OH does not exceed 2: 1. If necessary, a part of the low molecular weight aliphatic polyol can be replaced with another pooryl (aliphatic, aromatic polyol, polymer polyol, etc.) as long as a stable prepolymer can be obtained.

The polyisocyanate which is one raw material of the isocyanate-terminated prepolymer is a polyisocyanate having two to three isocyanate groups in one molecule, for example, toluene diisocyanate, 4,4'-diphenylmethane diisocyanate, xylene diisocyanate and the like. Aromatic isocyanate compounds, alicyclic isocyanate compounds, aliphatic isocyanate compounds, etc. can be used, but toluene diisocyanate (hereinafter referred to as TD)
I).

[0008] The low-molecular aliphatic polyol as the other raw material includes at least two hydroxyl groups bonded to a branched carbon chain having 5 to 20 carbon atoms in one molecule, or
A low molecular weight aliphatic polyol in which at least two hydroxyl groups are bonded at positions asymmetrical to a straight carbon chain having 5 to 20 carbon atoms is preferable. Examples of most preferred polyols are 2
-Ethyl-1,3-hexanediol, 2,4-diethyl-1,5-pentanediol and 3-methyl-1,5-pentanediol.

In order to adjust the viscosity of the isocyanate-terminated prepolymer, or to adjust the isocyanate content in the solution in accordance with the change in the mixing ratio of the base agent and the curing agent, the solid concentration in the solution is adjusted to toluene, xylene, or the like. It is appropriately adjusted by a solvent such as

Preferred examples of the diene-based liquid polymer polyol include polybutadiene, polyisoprene, polychloroprene, and butadiene having fluidity at room temperature and having hydroxyl groups at both molecular ends and having an average molecular weight of 500 to 10,000.
/ Isoprene copolymer, styrene / butadiene copolymer,
Examples include ethylene / propylene / butadiene copolymers and mixtures thereof.

The hydroxyl group-terminated liquid polybutadiene rubber used as an essential component of the curing agent in the present invention is Polybd R45HT (OH value = 0.83 to 0.81 m, manufactured by Idemitsu Petrochemical Co., Ltd.).
eq / g) (hereinafter abbreviated as Poly bd) is preferably used.
The cross-linked product of Poly bd contains urethane bonds like ordinary polyurethane, but has excellent heat resistance and hydrolysis resistance unlike ordinary polyurethane because it has no polyether or polyester bond in the main chain. In particular, hydrolysis resistance is the most important in the durability of the two-part curable urethane composition for civil engineering, and by using Poly bd,
It is possible to achieve high hydrolysis resistance, which is a drawback of the conventional two-part curable urethane composition.

Poly used in the curing agent of the present invention
In order to improve the physical strength of bd and further reinforce the water resistance, a petroleum resin is used in the present invention. Petroleum resin is Poly
It can be appropriately selected from those having good compatibility with bd according to the desired properties of the coating film. The petroleum resin used in the present invention has a softening point of 60 to 180 ° C. and an average molecular weight of 500 to 3000, particularly a softening point of 70 to 1
Petroleum resins having a temperature of 30 ° C. and an average molecular weight of 800 to 1500 are preferred. Petroleum resin is a general term for a polymerizable substance of a specific fraction obtained in a petroleum refining process, which is resinified without isolation and purification. Therefore, although it is not possible to show a detailed composition, from the viewpoint of its monomer composition, for example, an aliphatic copolymer composed of isoprene, piperylene, 2-methylbutene-1 or 2, and styrene,
Aromatic copolymers composed of vinyltoluene, α-methyltoluene, coumarone, indene and the like are roughly classified.

The liquid polymer composition used in the present invention may optionally contain additives such as a powder filler, an antioxidant, a pigment dispersant, an antifoaming agent and a catalyst. As the powder filler, calcium carbonate, clay,
Examples include inorganic powders such as talc, and pigments for coloring.
The compounding amount of the powder filler is 0 to 200 parts by weight, preferably 50 to 200 parts by weight based on 100 parts by weight of the liquid polymer. As the anti-aging agent, those compounded in ordinary rubber products, for example, amine-based and phenol-based anti-aging agents can be used. An appropriate amount of these compounds is 0.1 to 10 parts by weight based on 100 parts by weight of the liquid polymer. As the pigment dispersant, a polyester polyol-based pigment dispersant can be used. An appropriate amount of these components is 0.1 to 2 parts by weight based on 100 parts by weight of the liquid polymer. As the defoaming agent, a silicon-based defoaming agent can be used. An appropriate amount of these components is 0.1 to 2 parts by weight based on 100 parts by weight of the liquid polymer.
As the catalyst, organometallic compounds such as lead octenoate and dibutyltin dilaurate, and amines such as triethylamine are used. An appropriate amount of these components is 0.01 to 4 parts by weight based on 100 parts by weight of the liquid polymer.

In order to apply the composition of the present invention, a main component mainly composed of an isocyanate-terminated prepolymer obtained by a reaction between a polyisocyanate and a low-molecular aliphatic polyol in a solvent, and a hydroxyl-terminated polybutadiene are required. Depending on the curing agent containing polyol, petroleum resin, filler, various additives, solvent, catalyst, etc.
The isocyanate groups of the main agent and the hydroxyl groups of the curing agent are mixed so as to have an equivalent weight of 0.9 to 1.5, applied on the object to be coated, and cured. If the equivalent ratio of the isocyanate group of the main agent to the hydroxyl group of the curing agent is out of the range of 0.9 to 1.5, the physical properties aimed at by the present invention cannot be obtained.

[0015] The composition of the present invention is prepared by mixing
Even if the pot life is sufficiently lengthened, a cured coating film having excellent physical properties, excellent balance between physical strength and elongation, and excellent heat and humidity resistance can be obtained.

[0016]

The present invention will be specifically described below with reference to examples and comparative examples. The symbols used in the examples have the following meanings. “←” in the table indicates that the value is the same as the numerical value in the left column. In addition, the compounding amount is described by weight part.

(Main ingredient) TDI-80: Toluene diisocyanate cosmonate T80 / 20 2,4 (80%), 2,6 (20%)
(Manufactured by Mitsui Chemicals, Inc.) OG: 2-ethyl-1,3-hexanediol octanediol (manufactured by Kyowa Hakko Co., Ltd.) PD-9: 2,4-diethyl-1,5-pentanediol
Kyowadiol (manufactured by Kyowa Hakko Co., Ltd.) MPD: 1-methyl-1,5-pentanediol (manufactured by Kuraray Co., Ltd.) Poly bd: hydroxyl-terminated polybutadiene Hydroxyl content (meq / g = 0.81 to 0.83) (Idemitsu Oil D-3000: Polypropylene ether diol Hiflex D-3000 molecular weight 3000 (Daiichi Kogyo Seiyaku) D-1000: Polypropylene ether diol Hiflex D-1000 molecular weight 1000 (Daiichi Kogyo Seiyaku) T- 150: polyether polyol poly hardener
T150 Molecular weight 1500 (Daiichi Kogyo Seiyaku) Toluene: Toluene (General Petrochemical Co., Ltd.)

(Curing agent) Polybd, D-3000 and toluene are the same as those in the main agent column. MN-5000: Polyether polyol MN-5000 Mn-5000 Molecular weight 5000 (manufactured by Mitsui Chemicals, Inc.) MOCA: 4,4'-diamino-3 , 3'-dichloro-diphenylmethane Ihara cure min (TM) MT (Ihara Chemical industry Co., Ltd.) petroleum resin: petroleum resin (C ₈ -C ₁₀ aromatic hydrocarbon fraction polymer) (Nippon Petrochemical Co., Ltd.) calcium carbonate : Inorganic filler (manufactured by Takehara Chemical Industry Co., Ltd.) TN-12: Dibutyltin dilaurate (manufactured by Sakai Chemical Industry Co., Ltd.) P-17: Mixture of lead aliphatic monocarboxylate and mineral spirit (manufactured by Active Material Chemical Co., Ltd.)

(Working time) After mixing the main agent and the curing agent,
This is the time (minute) (the time required for the viscosity after mixing to reach 100,000 mPa · S) to be able to perform coating without any problem.

(Physical Properties of Cured Coating) Basic physical properties: After coating, the coating was cured in an atmosphere of 23 ° C. ± 2 ° C. for 7 days, and then subjected to a coating physical property test (JIS standard) conducted in accordance with JISA-6021. Then, the elongation at break is 450% or more,
(Tensile strength is 2.3 N / mm ² or more) Physical property development: After coating, the coating film is subjected to 1
Each of the cured materials for days 2, 3 and 14 was subjected to a coating film physical property test, and compared with the basic physical properties to evaluate the expression. Heat and humidity resistance: After coating, the coating film is cured in an atmosphere of 60 ° C. for 2 days, immersed in a 3% NaOH aqueous solution, and boiled at 100 ° C. for 8 hours.
Thereafter, leaving the sample at room temperature for 16 hours is one cycle, and after 3 cycles and 5 cycles, the specimen is taken out, washed with running water for 1 hour or more, and dried at room temperature for 16 hours or more. The strength, expressed as a ratio to the tensile strength of the basic physical properties, is taken as the retention rate and used as a measure for evaluating the heat and humidity resistance.

(Preparation of Main Agent (Isocyanate Terminated Prepolymer)) T-80 / 20 and toluene were charged into a 2-liter glass separable flask according to the composition shown in each table, and a low-molecular-weight polyol such as OG and Po were placed under a nitrogen atmosphere.
lybd, D-3000, T-1500, etc. are gradually added so that the NCO / OH equivalent ratio becomes 2/1,
The mixture was heated and stirred at 80 ± 5 ° C. for 2 to 5 hours to prepare an isocyanate prepolymer (base material) in which the reaction was completed.

(Preparation of curing agent) Poly bd, D-30 was placed in a 3 liter cylindrical open container according to the composition shown in each table.
00, MN-5000, DOP, etc., and then petroleum resin, MOCA, toluene, etc., and then heat and melt at 105 ° C., cool to 30 ° C., then charge calcium carbonate,
The mixture was stirred for 10 minutes to prepare a curing agent.

(Preparation of coating film for measuring physical properties of coating film)
The main agent and the curing agent that have been allowed to stand for more than an hour are placed in a plastic beaker according to the weight ratio of the main agent and the curing agent in each table, stirred for 3 minutes, and then flow-coated on a glass plate to a thickness of 1.0 ± 0.5 mm. The composition was cured at room temperature (23 ± 2 ° C.) to prepare a coating film for measuring the physical properties of the coating film.

Implementation. 1 to 3 and Comparative Example 1 Examples 1 to 3 were obtained by reacting a low molecular weight aliphatic polyol prepared according to the composition of Table 1 with TDI, and a Poly bd and a petroleum resin prepared according to the composition of Table 1, A curing agent composed of toluene was mixed at a weight ratio of main agent / curing agent = 1/6, and was applied on a glass plate by flow coating so as to have a thickness of 1.0 ± 0.5 mm. The coating was cured at 60 ° C. for 2 days. It is a result of preparing a test piece for measuring film physical properties and measuring its physical properties.

[0025]

[Table 1]

As can be seen from Examples 1 to 3, even when any of the low-molecular aliphatic polyols is used, a base material having low viscosity and excellent low-temperature stability can be obtained. It turns out that it shows very excellent performance for building use. Comparative Example 1 is a result when using a main agent obtained by reacting a conventional hydroxyl-terminated polybutadiene prepared according to the formulation in Table 1 with TDI, and Examples 1 to 3 are clearly superior in physical properties. You can see that it is.

[0027]

Examples 4 to 8 and Comparative Examples 2 to 6 Examples 4 to 8 show low molecular weight aliphatic polyols prepared according to the formulation in Table 2 and TD.
A main agent obtained by reacting with I and a curing agent prepared by changing the weight ratio of Poly bd prepared according to the formulation in Table 2,
The main agent / hardening agent were mixed at a weight ratio of 1/10, and the mixture was flow-coated on a glass plate so as to have a thickness of 1.0 ± 0.5 mm.
2 ° C) to prepare a test piece for measuring physical properties of the coating film,
It is the result of measuring the physical properties.

[0028]

[Table 2]

[0029]

[Table 3]

According to Table 3, the weight part of Poly bd is 24-25.
It can be seen that there is a peak of the performance as a urethane composition for civil engineering and construction when the balance between the development of physical properties / strength and elongation and the heat and humidity resistance are comprehensively evaluated. Comparative Example 2
To 6 are main components obtained by reacting a conventional hydroxyl-terminated polybutadiene prepared according to the formulation in Table 2 with TDI,
Table 3 shows the results when using a curing agent in which the weight ratio of Poly bd prepared according to the formulation in Table 2 was changed.
When the parts by weight of y bd are around 18 to 19, the peak of the performance as a urethane composition for civil engineering construction is found when the balance between physical property development / strength and elongation and heat and humidity resistance are comprehensively evaluated. Therefore, hereinafter, the weight of Poly bd in the curing agent is set to 24.7 in the example and 18.7 in the comparative example to prepare the curing agent.

Further, Examples 4 to 8 (when a main agent obtained by reacting a low-molecular aliphatic polyol with TDI was used) were compared with Comparative Examples 2 to 6 (a reaction between a conventional hydroxyl-terminated polybutadiene and TDI). Compared with the case of using the main agent obtained in Example 1), not only the physical properties but also the physical property expression and the heat and humidity resistance are improved, and it is clearly seen that the urethane composition for civil engineering is more excellent.

Examples 9 to 13 and Comparative Examples 7 to 11 Examples 9 to 13 were prepared by using the base material and the curing agent prepared according to the composition shown in Table 4 without changing the mixing weight ratio.
It is a result of adjusting the O / OH equivalent ratio to 1.1 to 1.5 with a very small amount of T-80 / 20 and evaluating the performance.

[0033]

[Table 4]

[0034]

[Table 5]

From Table 5, it can be seen that the performance as a urethane composition for civil engineering is peaked at around the NCO / OH equivalent ratio of 1.3. Comparative Examples 7 to 11 are shown in Table. Using the main agent and the curing agent prepared according to the formulation of No. 4, without changing the mixing weight ratio,
The NCO / OH equivalent ratio is changed to a small amount of EG or T-80 / 2.
This is a result of adjusting the performance to 1.1 to 1.5 with 0 and evaluating the performance. From Table 5, the peak of the performance as a urethane composition for civil engineering is seen around an NCO / OH equivalent ratio of 1.3.

Further, Examples 9 to 13 of Table 5 and Comparative Example 7
From No. 11 to 11, the elongation at break is almost the same, but there are significant differences in the property development and tensile strength, tear strength, and heat and humidity resistance. From this fact, the two-component curable urethane composition consisting of a main agent obtained by reacting a low-molecular aliphatic polyol with TDI and a curing agent composed of a diene-based liquid polymer polyol and a petroleum resin is far more useful for civil engineering and construction purposes. It can be clearly seen that it has excellent performance.

Examples 14 to 18 and Comparative Examples 12 to 16 Examples 14 to 18 and Comparative Examples 12 to 16 were prepared according to the formulation shown in Table 6 and the base material prepared according to the formulation in Table 6, respectively.
A petroleum resin and a hardener having a different blending ratio of calcium carbonate are mixed in a weight ratio of main agent / hardener = 1/10, and then flow coated on a glass plate so as to be 1.0 ± 0.5 mm. This is a result of preparing a test piece for measuring physical properties of a coating film cured at room temperature (23 ± 2 ° C.) and measuring the physical properties.

[0038]

[Table 6]

[0039]

[Table 7]

From Table 7, it can be seen that in both the examples and the comparative examples, the reduction in elongation is remarkably reduced as the amount of petroleum resin is reduced. Therefore,
The reinforcing effect of the petroleum resin is obvious. When the diene-based liquid polymer polyol is used as a main component of the curing agent, it is necessary to add the petroleum resin.

[0041]

Examples 19 to 23 and Comparative Examples 17 to 21
Examples 23 to 23 show the results when the pot life was changed from 40 minutes to 120 minutes using the main agent and the curing agent prepared according to the formulation in Table 8.

[0042]

[Table 8]

[0043]

[Table 9]

As is clear from Table 9, even if the pot life is changed in this range, there is no effect on the property development. Conventional two-part curable urethane composition for civil engineering, the problem of physical properties, the pot life could only take up to about 40 minutes ~ 60 minutes, the urethane composition provided by the present invention is Even if the pot life is set to 120 minutes, no problem occurs, and the low viscosity retention time after mixing the main agent and curing agent can be taken sufficiently long, and as a result, the defoaming property, leveling property, and workability are much higher than before. Can be improved. Comparative example. 17
Nos. To 21 are the results when the pot life was changed from 40 minutes to 120 minutes using the base agent and the curing agent prepared according to the formulation in Table 8. From Table 9, Comparative Example. 17 to 21, the embodiment. In order to adjust the pot life to the same as 19 to 23, more than twice the amount of catalyst is required. From this, it can be seen that the reactivity is better when the main agent obtained by reacting the low molecular weight aliphatic polyol with TDI is used. . It is known that the metal catalyst is a factor that lowers the heat resistance of the coating film. From Table 9, it can be seen that the smaller the amount of the catalyst, the better the heat and humidity resistance. Therefore, when a highly reactive main agent obtained by reacting a low molecular weight aliphatic polyol with TDI is used, a urethane composition for civil engineering and construction having more excellent heat resistance can be obtained.

Examples 24 to 28 and Comparative Examples 22 to 26 In Examples 24 to 28, the pot life at 25 ° C. was reduced from 40 minutes to 12 hours using the base material and the curing agent prepared according to the composition shown in Table 10.
This is the result when a test piece for measuring the physical properties of the coating film was prepared in an atmosphere of 10 ° C. while changing the temperature to 0 minutes.

[0046]

[Table 10]

[0047]

[Table 11]

From Table 11, it can be seen that in each case, sufficient physical properties can be obtained even in this low temperature (10 ° C.) atmosphere. For this reason, the urethane composition using a main component mainly composed of a low-molecular aliphatic polyol and a polyisocyanate can be used in winter without any problem. On the other hand, in Comparative Examples 22 to 26, the reduction in physical property expression is remarkable, and it can be seen that it is difficult to use it for civil engineering in winter.

Comparative Examples 27 to 35 Comparative Examples 27 to 35 are two-part curable PPGs for general civil engineering and construction.
This is a standard formulation of a urethane composition. According to Table 12, the base agent and the curing agent were prepared and mixed, and the mixture was placed on a glass plate at 1.0.
Flow coating was performed so that the thickness became ± 0.5 mm, and the coating was cured at room temperature (23 ± 2 ° C.) as it was to prepare a coating film for measuring coating film physical properties, and the physical properties were measured.

[0050]

[Table 12]

[0051]

[Table 13]

Table 13 shows that the two-part curable urethane composition for civil engineering shows sufficient performance in terms of physical properties and basic physical properties. However, the most important performance as a two-part curable urethane composition for civil construction is fatally poor, and its durability is not sufficiently satisfactory as a two-part curable urethane composition for civil construction. Understand

[0053]

As can be seen from the above description, according to the present invention, a main agent mainly composed of an isocyanate-terminated prepolymer obtained by reacting a low molecular weight aliphatic polyol with a polyisocyanate, and a diene liquid polymer polyol are used. A two-part curable urethane composition composed of a curing agent containing petroleum resin as a main component has a long low viscosity retention time after mixing the main agent and the curing agent, has good defoaming properties and leveling properties, and has properties and strength and strength. It is possible to obtain a very excellent urethane composition having excellent balance of elongation and excellent heat and humidity resistance for civil engineering and construction.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09D 175/04 C09D 175/04 F-term (Reference) 4J002 BA01X CK05W FD010 FD030 FD150 GL00 4J034 BA08 CA01 CA03 CA04 CC03 DA01 DB04 DP02 DP03 DP19 HA02 HA06 HA07 HC12 HC61 HC64 HC67 HC71 HC73 JA42 MA22 QA05 QB13 QB15 RA10 4J038 CR012 DG051 DG191 DG271 DG281 DG291 KA03 MA13 MA14 NA03 NA23 PB05

Claims (5)

[Claims] 1. A two-pack consisting of a main agent mainly composed of an isocyanate-terminated prepolymer obtained by reacting a low molecular weight aliphatic polyol with a polyisocyanate, and a curing agent mainly composed of a diene liquid polymer polyol and a petroleum resin. Curable urethane composition. 2. A low molecular weight aliphatic polyol having at least two hydroxyl groups bonded to a branched carbon chain having 5 to 20 carbon atoms in one molecule, or a straight chain having 5 to 20 carbon atoms. 2. A low molecular weight aliphatic polyol having at least two hydroxyl groups bonded at positions asymmetric with respect to the carbon chain.
2. The two-part curable urethane composition according to item 1. 3. The two-part curing method according to claim 1, wherein the polyisocyanate is any one of aliphatic, alicyclic, and aromatic polyisocyanates, and has two or less isocyanate groups in one molecule. Urethane composition. 4. The two-part curable urethane composition according to claim 1, wherein the diene-based liquid polymer polyol has an average molecular weight of 500 to 10,000. 5. The two-part curable urethane composition according to claim 1, wherein the petroleum resin has a softening point of 60 to 180 ° C. and an average molecular weight of 500 to 3000.