WO2013136892A1

WO2013136892A1 - Urethane-resin composition, coating agent, article, and leather-like sheet

Info

Publication number: WO2013136892A1
Application number: PCT/JP2013/053243
Authority: WO
Inventors: 智博鉄井; 直孝後藤
Original assignee: Dic株式会社
Priority date: 2012-03-13
Filing date: 2013-02-12
Publication date: 2013-09-19
Also published as: JPWO2013136892A1; JP5429431B1; TW201348331A

Abstract

The present invention addresses the problem of providing a urethane-resin composition exhibiting excellent dispersion stability, and capable of forming a film which exhibits excellent tensile strength, without producing an odor from the neutralizer or causing air-pollution problems. The present invention pertains to a urethane-resin composition containing an aqueous medium (B), and a urethane resin (A) having a structure (a2) and an alkoxy-polyoxyalkylene structure (a1) which contains 40-100 mass% of an oxyethylene structure, the urethane-resin composition being characterized in that the alkoxy-polyoxyalkylene structure (a1) containing 40-100 mass% of the oxyethylene structure is present in an end of the urethane resin (A) or a side chain of the urethane resin (A).

Description

Urethane resin composition, coating agent, article and leather-like sheet

The present invention relates to a urethane resin composition that can be used for various applications including a coating agent and an adhesive, and can also be used for manufacturing a leather-like sheet.

An aqueous urethane resin composition in which a urethane resin is dispersed in an aqueous medium can reduce the burden on the environment as compared with conventional organic solvent-based urethane resin compositions. It is used for various purposes.

As the aqueous urethane resin composition, generally known is a urethane resin having a hydrophilic group such as an anionic group dispersed in an aqueous medium, for example, at least one active hydrogen-containing group and an anion. A compound having a functional group or a cationic group, a compound having at least one active hydrogen-containing group and at least one unsaturated group, a polyol and / or a polyamine, and at least one active hydrogen-containing group A urethane resin composition obtained by reacting polysiloxane with polyisocyanate is known (see, for example, Patent Document 1).

However, the cationic group or anionic group as the hydrophilic group is generally a neutralized amino group or carboxyl group using an acidic compound or basic compound. In recent years, odors and air pollution caused by compounds have been a concern.

On the other hand, as the urethane resin composition, a urethane resin composition having a nonionic group such as a polyoxyethylene structure as a hydrophilic group has been studied (for example, see Patent Document 2).

However, since the nonionic urethane resin is inferior in water dispersibility as compared with a urethane resin having a cationic group or an anionic group, it may not be stably dispersed in an aqueous medium for a long period of time.

As a method for improving the water dispersion performance of the nonionic urethane resin composition, a method using an external emulsifier such as polyoxyethylene distyrenated phenyl ether is known.

However, the use of the emulsifier causes a significant decrease in the tensile strength of the film formed using the urethane resin composition. Therefore, when force is applied to the film, the film may crack or break. It was.

Thus, without causing problems of odor and air pollution caused by the neutralizing agent such as the basic compound, even in the case of substantially not using an external emulsifier, excellent dispersion stability in an aqueous medium, In fact, a urethane resin composition capable of forming a high-strength film has not yet been found.

JP 2009-248470 A JP 2009-249635 A

The problem to be solved by the present invention is a urethane that does not cause problems of odor and air pollution caused by the neutralizing agent, can form a film having excellent dispersion stability and excellent tensile strength. It is to provide a resin composition.

As a result of investigations to solve the above problems, the present inventors have an oxyethylene structure of 40% by mass to 100% by mass at the end of the main chain structure constituting the urethane resin or at the side chain with respect to the main chain structure. When the urethane resin having an alkoxypolyoxyalkylene structure (a1) and having a predetermined structure represented by the following general formula (1) is used in the main chain structure constituting the urethane resin, the above problems are solved. I found out that I can do it.

That is, the present invention relates to a urethane resin (A) having an alkoxypolyoxyalkylene structure (a1) having an oxyethylene structure of 40% by mass to 100% by mass and a structure (a2) represented by the following general formula (1): And the urethane resin composition containing the aqueous medium (B), wherein the alkoxypolyoxyalkylene structure (a1) having 40% by mass to 100% by mass of the oxyethylene structure is an end of the urethane resin (A) or The present invention relates to a urethane resin composition which is present in the side chain of the urethane resin (A).

(R ¹ and R ² in the general formula (1) each independently represents a hydrogen atom or an alkyl group. M represents an average value of 0 to 20, n represents an average value of 0 to 20, And the sum of n represents an average value of 1 to 40.)

The urethane resin composition of the present invention does not cause problems of odor and air pollution caused by a neutralizing agent used when neutralizing an anionic group or a cationic group as a hydrophilic group. Even when it is not substantially used, a film having excellent dispersion stability and excellent tensile strength can be formed. Therefore, it can be used, for example, as a coating agent, particularly a coating agent for forming a topcoat layer. Moreover, the said urethane resin composition can be used for formation of the skin layer which comprises laminated bodies, such as a leather-like sheet | seat, for example. Further, by impregnating a fiber base material such as a nonwoven fabric with the urethane resin composition, a leather-like sheet having a soft texture can be produced.

The urethane resin composition of the present invention comprises an urethane polyoxyalkylene structure (a1) having an oxyethylene structure of 40% by mass to 100% by mass and a structure (a2) represented by the following general formula (1) ( Of the urethane resin composition containing A) and the aqueous medium (B), the alkoxypolyoxyalkylene structure (a1) is at the end of the urethane resin (A) or the side chain of the urethane resin (A). It is characterized by existing.

As the urethane resin composition of the present invention, it is preferable to use the urethane resin (A) in which the urethane resin (A) is dispersed or dissolved in the aqueous medium (B) from the viewpoint of improving the handleability and coating workability.

First, the urethane resin (A) used for the urethane resin composition will be described.
The urethane resin (A) used in the present invention has the alkoxy polyoxyalkylene structure (a1) among those having the alkoxy polyoxyalkylene structure (a1) and the structure (a2) represented by the general formula (1). ) At the end of the urethane resin (A) or the side chain of the urethane resin (A).

As the urethane resin (A), the alkoxypolyoxyalkylene structure (a1) is a terminal of the main chain structure containing the urethane bond of the urethane resin (A), or the side of the urethane resin (A) with respect to the main chain structure. Use what you have in the chain.

Here, when a urethane resin having an alkoxypolyoxyalkylene structure in the main chain structure of the urethane resin is used instead of the urethane resin (A), it may not be possible to maintain excellent dispersion stability with respect to an aqueous medium. is there. The main chain structure referred to in the present invention is, for example, a urethane bond formed by reacting the hydroxyl group with an isocyanate group when a diol as a polyol is reacted with diisocyanate as a polyisocyanate to produce a urethane resin. The structure which has mainly.

The alkoxypolyoxyalkylene structure (a1) is an oxyethylene unit represented by the following formula (2) with respect to the entire alkoxypolyoxyalkylene structure (a1) in the range of 40% by mass to 100% by mass. Use what you have.

—CH ₂ CH ₂ O— (2)

Here, when the alkoxy polyoxyalkylene structure having 35% by mass of the oxyethylene unit is employed instead of the alkoxy polyoxyalkylene structure (a1), the dispersion stability of the urethane resin in an aqueous medium is significantly lowered. There is a case.

As the alkoxypolyoxyalkylene structure (a1), it is preferable to use the alkoxypolyoxyalkylene structure (a1) containing the oxyethylene unit in the range of 50% by mass to 100% by mass with respect to the entire alkoxypolyoxyalkylene structure (a1). In view of achieving both good dispersion stability and improvement in the tensile strength of the film to be formed, it is more preferable to use those containing in the range of 85% by mass to 100% by mass.

Examples of the alkoxypolyoxyalkylene structure (a1) include an alkoxypolyoxyethylene structure. The alkoxy polyoxyalkylene structure (a1) includes an alkoxy (polyoxyethylene-polyoxypropylene) structure, an alkoxy (polyoxyethylene-polyoxytetra) composed of oxyethylene units and other oxyalkylene units. A block structure such as a methylene) structure, a random structure composed of the oxyethylene unit and the oxypropylene structure, and a random structure composed of the oxyethylene unit and the oxytetramethylene structure.

Among the alkoxypolyoxyalkylene structures (a1), among those described above, a random structure composed of the oxyethylene units and oxypropylene units, and a random structure composed of the oxyethylene units and oxytetramethylene units. It is preferable to use such a material because the dispersion stability of the urethane resin (A) with respect to the water refrigerant (B) can be further improved.

In addition, as the alkoxy group constituting the terminal of the alkoxypolyoxyalkylene structure (a1), for example, a methyl group, an ethyl group, a butyl group, or the like is preferably used.

As the alkoxypolyoxyalkylene structure (a1), those having a number average molecular weight of 500 to 10,000 are preferably used, and those having a number average molecular weight of 500 to 5,000 are more preferably used. .

One alkoxypolyoxyalkylene structure (a1) may be present at one end of the urethane resin (A), or two or more may be present at one end of the urethane resin (A). . One or two or more alkoxypolyoxyalkylene structures (a1) may be present at both ends of the urethane resin (A).

Moreover, when the said urethane resin (A) has a multi-branch structure, specifically, when manufacturing the said urethane resin (A), three or more hydroxyl groups, such as a triol and a triisocyanate, are used as a polyol or a polyisocyanate. In the case of using an alcohol having three or more alcohols or isocyanates, the alkoxypolyoxyalkylene structure (a1) may be present at each terminal of the resulting urethane resin (A) at one or two or more. Good.

The alkoxy polyoxyalkylene structure (a1) may be present in the side chain of the main chain structure of the urethane resin (A) mainly composed of the polyol and polyisocyanate.

The alkoxypolyoxyalkylene structure (a1) is preferably present in the urethane resin (A) in the range of 0.1% by mass to 25% by mass with respect to the entire urethane resin (A). The presence in the range of ˜10% by mass is preferable because the urethane resin (A) can provide more excellent water dispersion stability and can form a film with even better tensile strength.

In addition, the urethane resin (A) can be used as long as it has the alkoxypolyoxyalkylene structure (a1), and together with the alkoxypolyoxyalkylene structure (a1), the following general formula (1) It is essential to use one having the structure (a2) represented by

(R ¹ and R ² in the general formula (1) each independently represents a hydrogen atom or an alkyl group. M represents an average value of 0 to 20, n represents an average value of 0 to 20, And the sum of n represents an average value of 1 to 40.)
Here, instead of the urethane resin (A), a urethane resin having the alkoxypolyoxyalkylene structure (a1) but not having the structure (a2) represented by the general formula (1) is used. In some cases, a film having excellent tensile strength cannot be formed.

R ¹ and R ² in the general formula (1) are each independently a hydrogen atom or an alkyl group, and both R ¹ and R ² are preferably a hydrogen atom or a methyl group.

In the general formula (1), m and n represent the average number of added moles of oxyethylene units, each having an average range of 0 to 20, preferably an average range of 1 to 20, and an average of 1 A range of from 5 to 5 is more preferable.

The total of m and n is an average range of 1 to 40, preferably an average range of 1 to 20, more preferably an average range of 1 to 10, and an average range of 1 to 5. More preferably.

By using the urethane resin (A) having the general formula (1), it is possible to maintain a good dispersion stability and to form a film having an excellent tensile strength.

The structure (a2) represented by the general formula (1) is preferably contained in the range of 0.1% by mass to 25% by mass with respect to the total amount of the urethane resin (A). It is more preferably contained in the range of 1% by mass, and it is preferably contained in the range of 1% by mass to 15% by mass in order to impart further excellent dispersion stability.

As the urethane resin (A) having the alkoxypolyoxyalkylene structure (a1) and the structure (a2) represented by the general formula (1), when forming a film having a further excellent tensile strength, Those having a weight average molecular weight of 000 to 1,000,000 are preferably used, and those having a weight average molecular weight in the range of 30,000 to 500,000 are more preferably used.

The urethane resin (A) is produced, for example, by reacting a polyol (a′-1) with a polyisocyanate (a′-2) to produce a urethane resin (A ′) having an isocyanate group at the terminal or side chain. Then, it can be produced by reacting the urethane resin (A ′) with a polyoxyalkylene monoalkyl ether in which one hydroxyl group of polyoxyalkylene glycol is sealed with an alkyl alcohol.

Examples of the polyol (a′-1) include a polyether polyol obtained by adding ethylene oxide to a bisphenol compound when the structure (a2) represented by the general formula (1) is introduced into the urethane resin (A). A polyether ester polyol obtained by reacting the polyether polyol with a polycarboxylic acid can be used.

Bisphenol A, bisphenol F, and the like can be used as the bisphenol compound that can undergo addition reaction of ethylene oxide.

The ethylene oxide is preferably added in the range of 1 to 10 and more preferably in the range of 1 to 5 with respect to one hydroxyl group of the bisphenol compound.

Examples of the polycarboxylic acid that can react with the polyether polyol in which ethylene oxide is added to the bisphenol compound include succinic acid, maleic acid, adipic acid, glutaric acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, and dodecane. Aliphatic polycarboxylic acids such as dicarboxylic acids, and aromatic polycarboxylic acids such as phthalic acid, isophthalic acid and terephthalic acid can be used.

As the polyether polyol and the polyether ester polyol, those having a number average molecular weight of 500 to 5,000 are preferably used in order to further improve the tensile strength of the film.

Further, the polyether polyol and the polyether ester polyol are a total of 0.1% by mass to 25% by mass with respect to the total amount of the polyol (a′-1) used in producing the urethane resin (A). It is preferable to use in a range.

Further, as the polyol (a′-1), in addition to the polyether polyol and the polyether ester polyol, other polyols can be used in appropriate combination as required.

Examples of the other polyol include polyether polyols, polyether ester polyols, polyester polyols, and polycarbonate polyols that do not have the structure (a2) represented by the general formula (1). In order to further improve the tensile strength of the film to be formed, it is preferable to use a polyether polyol or polycarbonate polyol that does not have the structure (a2) represented by 1).

As the polyether polyol not having the structure (a2) represented by the general formula (1), for example, addition polymerization of alkylene oxide is performed using one or more compounds having two or more active hydrogen atoms as an initiator. Can be used.

Examples of the initiator include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, trimethylene glycol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, glycerin, trimethylolethane, Trimethylolpropane and the like can be used.

As the alkylene oxide, for example, ethylene oxide, propylene oxide, butylene oxide, styrene oxide, epichlorohydrin, tetrahydrofuran and the like can be used.

As the polyether polyol not having the structure (a2) represented by the general formula (1), specifically, polyoxytetramethylene glycol or the like can be used.

Moreover, as a polyether ester polyol which does not have the structure (a2) shown by the said General formula (1), the polyether polyol and polycarboxylic acid which do not have the structure (a2) shown by the said General formula (1) What is obtained by reacting with can be used. Examples of the polycarboxylic acid include aliphatic polycarboxylic acids such as succinic acid, maleic acid, adipic acid, glutaric acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, and dodecanedicarboxylic acid, phthalic acid, isophthalic acid, terephthalic acid Aromatic polycarboxylic acids such as acids can be used.

As the polycarbonate polyol that can be used for the other polyols, for example, those obtained by reacting a carbonate or phosgene with a polyol can be used.

As the carbonate ester, methyl carbonate, dimethyl carbonate, ethyl carbonate, diethyl carbonate, cyclocarbonate, diphenyl carbonate and the like can be used.

Examples of the polyol that can react with the carbonate ester include ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, 1,4-butanediol, 1,3- Butanediol, 1,2-butanediol, 2,3-butanediol, 1,5-pentanediol, 1,5-hexanediol, 2,5-hexanediol, 1,6-hexanediol, 1,7-heptane Diol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, 1,12-dodecanediol, 3-methyl-1,5-pentanediol, 2- Ethyl-1,3-hexanediol, 2-methyl-1,3-pro Diol, 2-methyl-1,8-octanediol, 2-butyl-2-ethylpropanediol, 2-methyl-1,8-octanediol, neopentyl glycol, 1,4-cyclohexanediol, 1,4-cyclohexane Relatively low molecular weight dihydroxy compounds such as dimethanol, hydroquinone, resorcin, bisphenol-A, bisphenol-F, 4,4′-biphenol, polyether polyols such as polyethylene glycol, polypropylene glycol, polyoxytetramethylene glycol, polyhexa Polyester polyols such as methylene adipate, polyhexamethylene succinate and polycaprolactone can be used.

Examples of polyester polyols that can be used for the other polyols include those obtained by esterification of low molecular weight polyols and polycarboxylic acids, and ring-opening polymerization reactions of cyclic ester compounds such as ε-caprolactone. Polyester obtained, these copolyesters, etc. can be used.

Examples of the low molecular weight polyol include ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol, neopentyl glycol, and 1,3-butane having a molecular weight of about 50 to 300. An aliphatic polyol such as a diol, a polyol having an aliphatic cyclic structure such as cyclohexanedimethanol, and a polyol having an aromatic structure such as bisphenol A can be used.

Examples of the polycarboxylic acid that can be used in the production of the polyester polyol include aliphatic polycarboxylic acids such as succinic acid, adipic acid, sebacic acid, and dodecanedicarboxylic acid, terephthalic acid, isophthalic acid, phthalic acid, naphthalenedicarboxylic acid, and the like. Aromatic polycarboxylic acids and their anhydrides or esterifications can be used.

As the other polyols, those having a number average molecular weight in the range of 500 to 5,000 are preferably used.

The other polyol is preferably used in the range of 30% by mass to 95% by mass with respect to the total amount of the polyol (a′-1), and may be used in the range of 50% by mass to 95% by mass. It is preferable for further improving the tensile strength of the coating film.

Examples of the polyisocyanate (a′-2) that can react with the polyol (a′-1) include phenylene diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, polymethylene polyphenyl polyisocyanate, carbodiimidized diphenylmethane polyisocyanate, and the like. Aliphatic or aliphatic cyclic structures such as aromatic polyisocyanate, hexamethylene diisocyanate, lysine diisocyanate, cyclohexane diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, dimer acid diisocyanate, norbornene diisocyanate Having polyisocyanate etc. Alone in combination with the above use or two or may be used. Among them, it is preferable to use a polyisocyanate having an aliphatic cyclic structure, and it is particularly preferable to use isophorone diisocyanate or dicyclohexylmethane diisocyanate. Moreover, when the durability etc. which were excellent in the membrane | film | coat etc. to form are calculated | required, it is preferable to use aromatic polyisocyanate, such as diphenylmethane diisocyanate.

The reaction of the polyol (a′-1) and the polyisocyanate (a′-2) can be performed, for example, by mixing them in the absence of a solvent or in the presence of an organic solvent.

The reaction between the polyol (a′-1) and the polyisocyanate (a′-2) is a reaction between the hydroxyl group of the polyol (a′-1) and the isocyanate group of the polyisocyanate (a′-2). The equivalent ratio [isocyanate group / hydroxyl group] is preferably in the range of 1.05 to 2.5, more preferably 1.1 to 2.

Examples of the organic solvent that can be used in producing the urethane resin (A ′) include ketones such as acetone and methyl ethyl ketone; ethers such as tetrahydrofuran and dioxane; acetate esters such as ethyl acetate and butyl acetate; nitriles such as acetonitrile; Amides such as dimethylformamide and N-methylpyrrolidone can be used alone or in combination of two or more.

When producing the urethane resin (A ′), a chain extender can be used as necessary. Specifically, the polyol (a′-1) and the polyisocyanate (a′-2) are mixed in the absence of a solvent or in the presence of an organic solvent, and at 50 ° C. to 100 ° C. for about 3 hours to 10 hours. A urethane prepolymer having an isocyanate group at the terminal is produced by reacting to the extent, and then a urethane resin having a urea bond having a relatively high molecular weight is produced by reacting the urethane prepolymer with a chain extender. be able to.

Examples of the chain extender include polyamines, hydrazine compounds, and other compounds having active hydrogen atoms.

Examples of the polyamine include ethylenediamine, 1,2-propanediamine, 1,6-hexamethylenediamine, piperazine, 2,5-dimethylpiperazine, isophoronediamine, 4,4'-dicyclohexylmethanediamine, 3,3'- Diamines such as dimethyl-4,4′-dicyclohexylmethanediamine, 1,4-cyclohexanediamine; N-hydroxymethylaminoethylamine, N-hydroxyethylaminoethylamine, N-hydroxypropylaminopropylamine, N-ethylaminoethylamine, N -A diamine having one primary amino group and one secondary amino group such as methylaminopropylamine; polyamines such as diethylenetriamine, dipropylenetriamine and triethylenetetramine can be used. .

Examples of the hydrazine compound include hydrazine, N, N′-dimethylhydrazine, 1,6-hexamethylenebishydrazine, succinic acid dihydrazide, adipic acid dihydrazide, glutaric acid dihydrazide, sebacic acid dihydrazide, isophthalic acid dihydrazide, β- Semicarbazide propionic acid hydrazide, 3-semicarbazide-propyl-carbazate, semicarbazide-3-semicarbazidemethyl-3,5,5-trimethylcyclohexane, and the like can be used.

Examples of the other active hydrogen-containing compounds include ethylene glycol, diethylene recall, triethylene glycol, propylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, hexamethylene glycol, Use sucrose, methylene glycol, glycerin, sorbitol, bisphenol A, 4,4'-dihydroxydiphenyl, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl sulfone, hydrogenated bisphenol A, hydroquinone, water, etc. Can do.

The chain extender introduces a urea bond into the formed film, and as a result, further improves the durability of the film. From the viewpoint of further improving the durability of the film, the chain extender is based on the total amount of raw materials used for the production of the urethane resin (A ′). It is preferably used in the range of 1% by mass to 10% by mass, and more preferably in the range of 1% by mass to 5% by mass.

The urethane resin (A) includes a urethane resin (A ′) having an isocyanate group at the terminal or side chain obtained above, and a polyoxyalkylene mono group in which one hydroxyl group of polyoxyalkylene glycol is sealed with an alkyl group. It can be produced by reacting with an alkyl ether. The reaction can be carried out, for example, by mixing them in the absence of a solvent or in the presence of an organic solvent and reacting at about 50 ° C. to 100 ° C. for about 3 hours to 10 hours.

As the polyoxyalkylene glycol monoalkyl ether used in the reaction, one in which one of two hydroxyl groups of polyoxyalkylene glycol is sealed with an alkyl group can be used.

Specifically, as the polyoxyalkylene glycol monoalkyl ether, polyoxyethylene glycol monomethyl ether, polyoxyethyleneoxypropylene glycol monomethyl ether, dihydroxy polyoxyethylene monomethyl ether, or the like can be used. Among these, the use of polyoxyethylene glycol monomethyl ether is preferable for forming a film having further excellent dispersion stability and further excellent tensile strength.

As the polyoxyalkylene glycol monoalkyl ether, those having a number average molecular weight of 500 to 10,000 are preferably used, and those having a number average molecular weight of 500 to 5,000 are preferably used.

Examples of a method for producing a urethane resin composition by mixing the urethane resin (A) obtained by the production method with an aqueous medium (B) include the urethane resin (A) obtained by the method or an organic solvent solution thereof. The aqueous medium (B) can be mixed and stirred. It is preferable to remove the organic solvent that can be contained at that time by a distillation method or the like, if necessary. When mixing the urethane resin (A) and the aqueous medium (B), a machine such as a homogenizer may be used as necessary.

Examples of the aqueous medium (B) in which the urethane resin (A) obtained by the production method can be dispersed or dissolved include water, an organic solvent miscible with water, and a mixture thereof. Examples of the organic solvent miscible with water include alcohols such as methanol, ethanol, n-propanol and isopropanol; ketones such as acetone and methyl ethyl ketone; polyalkylene glycols such as ethylene glycol, diethylene glycol and propylene glycol; alkyl ethers of polyalkylene glycols And lactams such as N-methyl-2-pyrrolidone. In the present invention, only water may be used, a mixture of water and an organic solvent miscible with water may be used, or only an organic solvent miscible with water may be used. From the viewpoint of safety and load on the environment, water alone or a mixture of water and an organic solvent miscible with water is preferable, and only water is particularly preferable.

The urethane resin composition of the present invention obtained by the above method preferably contains the urethane resin (A) in the range of 15% by mass to 60% by mass with respect to the total amount of the urethane resin composition. More preferably, the content is in the range of 20% by mass to 60% by mass, and even more preferably 30% by mass to 55% by mass in view of improving the coating workability.

The aqueous medium (B) is preferably contained in the range of 30% by mass to 80% by mass with respect to the total amount of the urethane resin composition, and contained in the range of 40% by mass to 80% by mass. It is more preferable that the content is 45 mass% to 70 mass%, in order to improve the coating workability.

In general urethane resin compositions, an emulsifier is often used in combination from the viewpoint of further improving the dispersion stability. However, the use of the emulsifier has contributed to a decrease in the appearance and water resistance of the resulting film.

Since the urethane resin composition of the present invention can maintain good dispersion stability without using the above-mentioned emulsifier together, it can also form a film excellent in appearance and water resistance. Specifically, the urethane resin composition of the present invention may contain an emulsifier in the range of 0% by mass to 5% by mass with respect to the total amount of the urethane resin composition, and 0% by mass to 0.5% by mass. % May be included, and it is more preferable not to include an emulsifier.

The urethane resin composition of the present invention may contain various additives as necessary. For example, associative thickeners, alkali-soluble thickeners, crosslinking agents, urethanization catalysts, silane coupling agents, fillers, thixotropic agents, tackifiers, waxes, heat stabilizers, light-resistant stabilizers, fluorescence Additives such as brighteners, foaming agents, thermoplastic resins, thermosetting resins, pigments, dyes, conductivity-imparting agents, antistatic agents, moisture permeability improvers, water repellents, oil repellents, hollow foams, crystals Combined use of water-containing compounds, flame retardants, water absorbents, moisture absorbents, deodorants, foam stabilizers, antifoaming agents, antifungal agents, antiseptics, algaeproofing agents, pigment dispersants, antiblocking agents, and hydrolysis inhibitors can do.

Examples of the associative thickener include cellulose derivatives such as hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, polyacrylate, polyvinyl pyrrolidone, urethane thickener, polyether thickener, and the like. Especially, it is preferable to use the thickener containing a polyacrylate with a high thickening effect with respect to the said urethane resin (A). The associative thickener is preferably used in the range of 0.5% by mass to 5% by mass with respect to the total amount of the urethane resin (A).

Since the urethane resin composition can form a high-strength film, it can be suitably used as a coating agent used for surface coating of various substrates, preferably a coating agent for forming a topcoat layer.

Examples of the base material include fibrous base materials such as woven fabric and nonwoven fabric, plated steel plates such as galvanized steel plates and aluminum-zinc alloy steel plates, metal bases such as aluminum plates, aluminum alloy plates, electromagnetic steel plates, copper plates, and stainless steel plates. Plastics such as materials, polycarbonate base, polyester base, acrylonitrile-butadiene-styrene base, polyacryl base, polystyrene base, polyurethane base, epoxy resin base, polyvinyl chloride base and polyamide base Substrates, glass substrates and leather-like sheets can be used. Among them, as the base material, it is possible to use a leather-like sheet such as synthetic leather or artificial leather that is processed and used for shoes or bags, and other members are attached to the surface of the leather-like sheet using an adhesive. Affixing or applying a putty or the like is preferable because a leather-like sheet excellent in design can be efficiently produced.

The coating agent of the present invention can form a film by, for example, applying it directly to the surface of the substrate, and then drying and curing. It is also possible to form a film by applying the coating agent of the present invention to the release paper surface, drying and curing, and then laminating the substrate on the coated surface. In addition, when using the said crosslinking agent, mixing the said urethane resin (A) etc. and the said crosslinking agent just before apply | coating the said coating agent to the base-material surface has favorable coating workability | operativity. It is preferable in maintaining.

Examples of the method for applying the coating agent on the substrate include a spray method, a curtain coater method, a flow coater method, a roll coater method, a brush coating method, and a dipping method.

The method of drying and curing may be a method of curing for about 1 to 10 days at room temperature, but from the viewpoint of rapidly proceeding curing, at a temperature of 50 ° C. to 250 ° C. for 1 second to 600 ° C. A method of heating for about a second is preferable. In the case of using a plastic substrate that is easily deformed or discolored at a relatively high temperature, curing is preferably performed at a relatively low temperature of about 30 ° C. to 100 ° C.

The film thickness of the film formed using the coating agent of the present invention can be appropriately adjusted according to the use of the article provided with the film, but it is usually preferably about 0.5 μm to 100 μm.

When the urethane resin composition of the present invention is used as a coating agent for forming a topcoat layer, an intermediate layer such as a primer layer may be provided on the surface of the base material in advance. As the primer layer, for example, a conventionally known paint containing an acrylic resin, a paint containing a polyester resin, a paint containing an alkyd resin, a paint containing an epoxy resin, a paint containing a fatty acid-modified epoxy resin, Examples thereof include those formed using a paint containing a silicone resin, a paint containing a polyurethane resin, and the like.

As described above, an article provided with a film formed using the base material and the coating agent of the present invention includes, for example, mobile parts, home appliances, OA equipment, automobile parts such as automobile interior and exterior materials, and various home appliances. It can be used for product parts and building material products.

Further, the urethane resin composition of the present invention can be used as a material for forming the skin layer constituting the leather-like sheet. A leather-like sheet is generally a laminate in which an intermediate layer such as a porous layer is laminated on the surface of a fibrous base material impregnated with a resin as necessary, and a skin layer is laminated on the intermediate layer. The urethane resin composition of the present invention can be suitably used for forming the skin layer.

As the fibrous base material, a nonwoven fabric, a woven fabric, a knitted fabric or the like can be used. As the material constituting the base material, for example, polyester fiber, nylon fiber, acrylic fiber, polyurethane fiber, acetate fiber, rayon fiber, polylactic acid fiber, cotton, hemp, silk, wool, blended fiber thereof or the like is used. Can do.

The surface of the base material may be subjected to antistatic processing, mold release processing, water repellent processing, water absorption processing, antibacterial and deodorizing processing, antibacterial processing, ultraviolet blocking processing and the like as necessary.

A leather-like sheet in which a skin layer is laminated directly on the surface of the fibrous base material, for example, forms a skin layer by applying the urethane resin composition on a sheet subjected to a release treatment and drying it. Then, it can manufacture by laminating | stacking the said fiber base material on this skin layer using an adhesive agent etc. Examples of the method for applying the urethane resin composition on the sheet include a gravure coater method, a knife coater method, a pipe coater method, and a comma coater method. Further, as a method for drying and curing the urethane resin composition applied by the above method, for example, it is allowed to stand for 1 to 10 days at room temperature, or heated at a temperature of 50 to 250 ° C. for 1 to 600 seconds. The method of doing is mentioned.

Further, as the leather-like sheet, an intermediate layer such as a porous layer is provided between the fibrous base material and the skin layer. For example, the urethane resin composition is provided on a sheet subjected to a release treatment. A skin layer is formed by coating and drying, and then a porous layer forming resin composition foamed by a conventionally known mechanical foaming method or water foaming method is applied and cured on the skin layer. A layer can be formed, and then a fibrous base material can be laminated on the porous layer using a conventionally known adhesive.

Further, the urethane resin composition of the present invention can be used for producing a leather-like sheet comprising an impregnated base material obtained by impregnating a fiber base material.

As the fiber base material, a nonwoven fabric, a woven fabric, a knitted fabric or the like can be used. As the constituent of the fiber base material, for example, polyester fiber, nylon fiber, acrylic fiber, polyurethane fiber, acetate fiber, rayon fiber, polylactic acid fiber, cotton, hemp, silk, wool, and blended fibers thereof are used. be able to.

Examples of the method of impregnating the urethane resin of the fiber base material include a method of directly immersing the fiber base material in a tank storing the urethane resin composition and squeezing excess urethane resin with a mangle or the like.

Next, the urethane resin composition is coagulated by heating the fiber substrate impregnated with the urethane resin composition to a temperature equal to or higher than the heat-sensitive coagulation temperature of the urethane resin (approximately 50 ° C. to 80 ° C.), and the urethane resin composition The aqueous medium (B) contained therein is evaporated. Thereby, the base material which the fiber base material impregnated with urethane resin (A) can be manufactured.

Leather-like sheets obtained by the above method are, for example, shoes, bags, clothing, furniture members such as chairs and sofas, automobile interior materials such as vehicle seats and handles, moisture-permeable and waterproof materials, synthetic leather, artificial leather, etc. It can be used for leather-like sheets, abrasives, felt pen cores, and the like.

As described above, the urethane resin composition of the present invention can be suitably used for the production of various layered product skin layers, particularly leather-like sheets, including various coating agents.

Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples.

[Example 1] Preparation of urethane resin composition (X1) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 600 g of polyoxytetramethylene glycol (number average molecular weight 2000), 2 ethylene oxides in bisphenol A 65 g of the compound (M ¹ in which R ¹ and R ² in the general formula (1) are methyl groups and the sum of m and n is 2) and 75 g of polyoxyethylene glycol monomethyl ether (number average molecular weight 4,000) And 70 g of cyclohexanedimethanol and 360 g of dicyclohexylmethane diisocyanate are reacted at 70 ° C. until the NCO% reaches 1.3% by mass, whereby a methyl ethyl ketone solution of a urethane prepolymer having an isocyanate group at the terminal (X1 ′) is obtained. Got. The NCO% represents the mass ratio of isocyanate groups to the total amount of the methyl ethyl ketone solution of the urethane prepolymer (X1 ′).

An emulsion was obtained by mixing 2340 g of a methyl ethyl ketone solution of the urethane prepolymer (X1 ′) with 2340 g of pure water and phase inversion emulsifying.

The obtained emulsion is supplied with 270 g of a chain extender aqueous solution containing 27 g of piperazine, and mixed to cause a chain extension reaction, and by distilling off methyl ethyl ketone, a urethane resin composition (X1) having a nonvolatile content of 40% by mass Got.

[Example 2] Preparation of urethane resin composition (X2) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 325 g of polyoxytetramethylene glycol (number average molecular weight 2,000), bisphenol A and ethylene oxide 65 g of a compound (a compound in which R ¹ and R ² in the general formula (1) are methyl groups and m and n are 2) and polyoxyethylene glycol monomethyl ether (number average molecular weight 4,000) ) 350 g of cyclohexane dimethanol and 360 g of dicyclohexylmethane diisocyanate are reacted at 70 ° C. until the NCO% reaches 1.7% by mass, whereby the urethane prepolymer (X2 ′) having an isocyanate group at the terminal is reacted. A methyl ethyl ketone solution was obtained.

An emulsion was obtained by mixing 2340 g of the methyl ethyl ketone solution of the urethane prepolymer (X2 ′) with 2340 g of pure water and phase-inverting the mixture.

The obtained emulsion is supplied with 370 g of a chain extender aqueous solution containing 37 g of piperazine and mixed to cause a chain extension reaction, thereby distilling off methyl ethyl ketone, whereby a urethane resin composition (X2) having a nonvolatile content of 30% by mass is obtained. Got.

[Example 3] Preparation of urethane resin composition (X3) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 415 g of polyoxytetramethylene glycol (number average molecular weight 2000) and 2 of ethylene oxide in bisphenol A Mole-added compound (a compound in which R ¹ and R ^{2 in} general formula (1) are methyl groups and m and n are 2) and 75 g of polyoxyethylene glycol monomethyl ether (number average molecular weight 4,000) And 360 g of dicyclohexylmethane diisocyanate were reacted at 70 ° C. until the NCO% reached 1.2% by mass to obtain a methyl ethyl ketone solution of a urethane prepolymer (X3 ′) having an isocyanate group at the terminal.

An emulsion was obtained by mixing 2340 g of a methyl ethyl ketone solution of the urethane prepolymer (X3 ′) with 2340 g of pure water and carrying out phase inversion emulsification.

The obtained emulsion is supplied with 250 g of a chain extender aqueous solution containing 25 g of piperazine and mixed to cause a chain elongation reaction, and by distilling off methyl ethyl ketone, a urethane resin composition (X3) having a nonvolatile content of 40% by mass. Got.

[Example 4] Preparation of urethane resin composition (X4) In the presence of 1110 g of methyl ethyl ketone and 0.1 g of stannous octylate, 600 g of polyoxytetramethylene glycol (number average molecular weight 2,000), bisphenol A and ethylene oxide 65 g of a compound (a compound in which R ¹ and R ² in the general formula (1) are methyl groups, and the sum of m and n is 2) and a polyol having a methoxypolyoxyethylene structure in the side chain (YMER) (N120; Perstorp) 15 g, cyclohexane dimethanol 70 g, and dicyclohexylmethane diisocyanate 360 g are reacted at 70 ° C. until the NCO% reaches 1.3% by mass, whereby a urethane prepolymer having an isocyanate group at the molecular end. (X4 ′) methyl ethyl keto To obtain a solution.

An emulsion was obtained by mixing 2220 g of a methyl ethyl ketone solution of urethane prepolymer (X4 ′) having an isocyanate group at the molecular end with 2220 g of pure water and phase-inverting and emulsifying.

The obtained emulsion was supplied with 270 g of a chain extender aqueous solution containing 27 g of piperazine and mixed to cause a chain extension reaction.

Next, by distilling off methyl ethyl ketone from the reaction mixture, a urethane resin composition (X4) having a nonvolatile content of 40% by mass was obtained.

[Example 5] Preparation of urethane resin composition (X5) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 600 g of polyoxytetramethylene glycol (number average molecular weight 2,000), bisphenol A and ethylene oxide 65 g of a compound (a compound in which R ¹ and R ² in the general formula (1) are methyl groups and m and n are 10) and polyoxyethylene glycol monomethyl ether (number average molecular weight 4,000) ) 75 g, cyclohexane dimethanol 70 g, and dicyclohexylmethane diisocyanate 360 g are reacted at 70 ° C. until the NCO% reaches 1.3% by mass, whereby the urethane prepolymer (X5 ′) having an isocyanate group at the terminal is reacted. A methyl ethyl ketone solution was obtained.

An emulsion was obtained by mixing 2340 g of the methyl ethyl ketone solution of the urethane prepolymer (X5 ′) with 2340 g of pure water and phase inversion emulsifying.

The obtained emulsion is supplied with 270 g of a chain extender aqueous solution containing 27 g of piperazine, and mixed to cause a chain extension reaction, and by distilling off methyl ethyl ketone, a urethane resin composition having a nonvolatile content of 40% by mass (X5) Got.

[Example 6] Preparation of urethane resin composition (X6) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 600 g of polyoxytetramethylene glycol (number average molecular weight 2,000), bisphenol A and ethylene oxide 65 g of a compound (a compound in which R ¹ and R ² in the general formula (1) are methyl groups, and the sum of m and n is 2) and monobutyl ether of a polyoxyethylene polyoxypropylene random copolymer (Oxyethylene structure / oxypropylene structure mass ratio: 75/25, number average molecular weight 3,400) 75 g, cyclohexanedimethanol 70 g, and dicyclohexylmethane diisocyanate 360 g, until NCO% reaches 1.3 mass% Isocyanate at the end by reacting at 70 ° C To obtain a methyl ethyl ketone solution of urethane prepolymer urethane prepolymer (X6 ') having an over preparative group.

An emulsion was obtained by mixing 2340 g of the methyl ethyl ketone solution of the urethane prepolymer (X6 ′) with 2340 g of pure water and carrying out phase inversion emulsification.

The obtained emulsion is supplied with 270 g of a chain extender aqueous solution containing 27 g of piperazine, and mixed to cause a chain extension reaction, and by distilling off methyl ethyl ketone, a urethane resin composition having a nonvolatile content of 40% by mass (X6) Got.

[Example 7] Preparation of urethane resin composition (X7) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 600 g of polycarbonate diol (manufactured by Nippon Polyurethane Industry Co., Ltd., Nipponporan N980R, number average molecular weight 2000), 65 g of a compound obtained by adding 2 mol of ethylene oxide to bisphenol A (a compound in which R ¹ and R ² in the general formula (1) are methyl groups, and the total of m and n is 2), and polyoxyethylene glycol monomethyl ether (several Urethane prepolymer having an isocyanate group at the terminal by reacting 75 g of average molecular weight 4,000), 70 g of cyclohexanedimethanol, and 360 g of dicyclohexylmethane diisocyanate at 70 ° C. until NCO% reaches 1.3% by mass. (X7 ') A til ethyl ketone solution was obtained. The NCO% represents a mass ratio of isocyanate groups to the total amount of the methyl ethyl ketone solution of the urethane prepolymer (X7 ′).

An emulsion was obtained by mixing 2340 g of a methyl ethyl ketone solution of the urethane prepolymer (X7 ′) with 2340 g of pure water and carrying out phase inversion emulsification.

The obtained emulsion is supplied with 270 g of a chain extender aqueous solution containing 27 g of piperazine and mixed to cause a chain extension reaction, and by distilling off methyl ethyl ketone, a urethane resin composition having a nonvolatile content of 40% by mass (X7) Got.

Example 8 Preparation of Urethane Resin Composition (X8) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 415 g of polycarbonate diol (Nippon Polyurethane Industry Co., Ltd., Nipponran N980R, number average molecular weight 2000), 250 g of a compound obtained by adding 2 moles of ethylene oxide to bisphenol A (a compound in which R ¹ and R ² in the general formula (1) are methyl groups, and the sum of m and n is 2), and polyoxyethylene glycol monomethyl ether (several Methyl ethyl ketone of urethane prepolymer (X8 ′) having an isocyanate group at the terminal end by reacting 75 g of average molecular weight 4,000) and 360 g of dicyclohexylmethane diisocyanate at 70 ° C. until NCO% reaches 1.2% by mass. A solution was obtained.

An emulsion was obtained by mixing 2340 g of a methyl ethyl ketone solution of the urethane prepolymer (X8 ′) with 2340 g of pure water and phase-inverting and emulsifying.

The obtained emulsion is supplied with 250 g of a chain extender aqueous solution containing 25 g of piperazine, and mixed to cause a chain elongation reaction, and by distilling off methyl ethyl ketone, a urethane resin composition having a nonvolatile content of 40% by mass (X8) Got.

[Example 9] Preparation of urethane resin composition (X9) In the presence of 1110 g of methyl ethyl ketone and 0.1 g of stannous octylate, 600 g of polycarbonate diol (manufactured by Nippon Polyurethane Industry Co., Ltd., Nipponran N980R, number average molecular weight 2,000) And 65 g of a compound obtained by adding 2 mol of ethylene oxide to bisphenol A (a compound in which R ¹ and R ² in the general formula (1) are methyl groups, and the total of m and n is 2), and methoxypolyoxy in the side chain By reacting 15 g of an ethylene-structured polyol (YMER N120; Perstorp) with 70 g of cyclohexanedimethanol and 360 g of dicyclohexylmethane diisocyanate at 70 ° C. until the NCO% reaches 1.3% by mass, the terminal isocyanato. Urethanes with groups A methyl ethyl ketone solution of prepolymer (X9 ′) was obtained.

An emulsion was obtained by mixing 2220 g of a methyl ethyl ketone solution of urethane prepolymer (X9 ′) having an isocyanate group at the terminal with 2220 g of pure water and phase-inverting emulsifying it.

Next, by distilling off methyl ethyl ketone from the reaction mixture, a urethane resin composition (X9) having a nonvolatile content of 40% by mass was obtained.

[Example 10] Preparation of urethane resin composition (X10) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 600 g of polycarbonate diol (manufactured by Nippon Polyurethane Industry Co., Ltd., Nipponran N980R, number average molecular weight 2,000) 65 g of a compound obtained by adding 10 mol of ethylene oxide to bisphenol A (a compound in which R ¹ and R ² in the general formula (1) are methyl groups, and the total of m and n is 10), and polyoxyethylene glycol monomethyl ether Urethane having an isocyanate group at the end by reacting 75 g of (number average molecular weight 4,000), 70 g of cyclohexanedimethanol, and 360 g of dicyclohexylmethane diisocyanate at 70 ° C. until NCO% reaches 1.3% by mass. Prepolymer ( To obtain a methyl ethyl ketone solution of 10 ').

An emulsion was obtained by mixing 2340 g of a methyl ethyl ketone solution of the urethane prepolymer (X10 ′) with 2340 g of pure water and phase inversion emulsifying.

The obtained emulsion is supplied with 270 g of a chain extender aqueous solution containing 27 g of piperazine and mixed to cause a chain extension reaction, and by distilling off methyl ethyl ketone, a urethane resin composition having a nonvolatile content of 40% by mass (X10) Got.

[Example 11] Preparation of urethane resin composition (X11) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 600 g of polycarbonate diol (manufactured by Nippon Polyurethane Industry Co., Ltd., Nipponran N980R, number average molecular weight 2,000) And 65 g of a compound obtained by adding 2 mol of ethylene oxide to bisphenol A (a compound in which R ¹ and R ² in the general formula (1) are methyl groups, and the total of m and n is 2), and polyoxyethylene polyoxypropylene 75 g of random copolymer monobutyl ether (mass ratio of oxyethylene structure / oxypropylene structure: 75/25, number average molecular weight 3,400), 70 g of cyclohexanedimethanol, 360 g of dicyclohexylmethane diisocyanate, NCO% is 1 Until it reaches 3% by mass By reacting at 70 ° C., to obtain a methyl ethyl ketone solution of urethane prepolymer urethane prepolymer (X11 ') having a terminal isocyanate group.

An emulsion was obtained by mixing 2340 g of a methyl ethyl ketone solution of the urethane prepolymer (X11 ′) with 2340 g of pure water and phase inversion emulsifying.

The obtained emulsion is supplied with 270 g of a chain extender aqueous solution containing 27 g of piperazine, and mixed to cause a chain elongation reaction, and by distilling off methyl ethyl ketone, a urethane resin composition (X11) having a nonvolatile content of 40% by mass. Got.

Comparative Example 1 Preparation of Urethane Resin Composition (Y1) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 665 g of polyoxytetramethylene glycol (number average molecular weight 2,000) and polyoxyethylene glycol monomethyl By reacting 75 g of ether (number average molecular weight 4,000), 70 g of cyclohexanedimethanol, and 360 g of dicyclohexylmethane diisocyanate at 70 ° C. until the NCO% reaches 1.8% by mass, the terminal has an isocyanate group. A methyl ethyl ketone solution of urethane prepolymer (Y1 ′) was obtained.

1650 g of the methyl ethyl ketone solution of the urethane prepolymer (Y1 ′) was mixed with 1650 g of pure water, and phase emulsified to obtain an emulsion.

The obtained emulsion is supplied with 400 g of a chain extender aqueous solution containing 40 g of piperazine and mixed to cause a chain extension reaction, and by distilling off methyl ethyl ketone, a urethane resin composition having a nonvolatile content of 40% by mass (Y1) Got.

Comparative Example 2 Preparation of Urethane Resin Composition (Y2) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 675 g of polyoxytetramethylene glycol (number average molecular weight 2,000), bisphenol A and ethylene oxide 2 g of a compound (a compound in which R ¹ and R ² in the general formula (1) are methyl groups and m and n are 2), 70 g of cyclohexanedimethanol, and 360 g of dicyclohexylmethane diisocyanate are mixed with NCO. By reacting at 70 ° C. until% reached 1.3% by mass, a methyl ethyl ketone solution of urethane prepolymer (Y2 ′) having a terminal isocyanate group was obtained.

Methyl ethyl ketone solution 2340 g of urethane prepolymer (Y2 ′) having an isocyanate group at the terminal was mixed with 2340 g of pure water and phase-inversion emulsified, but a stable emulsion could not be obtained, and as a result, urethane resin composition (Y2) could not be obtained.

Comparative Example 3 Preparation of Urethane Resin Composition (Y3) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 600 g of polyoxytetramethylene glycol (number average molecular weight 2,000), bisphenol A and propylene oxide Until the NCO% reaches 1.3% by mass, 65 g of the compound having 2 moles added, 75 g of polyoxyethylene glycol monomethyl ether (number average molecular weight 4,000), 70 g of cyclohexanedimethanol, and 360 g of dicyclohexylmethane diisocyanate. By making it react at 70 degreeC, the methyl ethyl ketone solution of the urethane prepolymer (Y3 ') which has an isocyanate group at the terminal was obtained.

An emulsion was obtained by mixing 2340 g of the methyl ethyl ketone solution of the urethane prepolymer (Y3 ′) with 2340 g of pure water and phase inversion emulsifying.

By supplying 270 g of a chain extender aqueous solution containing 27 g of piperazine to the obtained emulsion and mixing it to cause chain elongation reaction, and distilling off methyl ethyl ketone, a urethane resin composition having a nonvolatile content of 40% by mass (Y3) Got.

[Comparative Example 4] Preparation of Urethane Resin Composition (Y4) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 600 g of polyoxytetramethylene glycol (number average molecular weight 2,000) and polyoxyethylene polyoxy 65 grams of diol (oxyethylene / oxypropylene mass ratio: 75/25, number average molecular weight 3,000) made of a propylene random copolymer, 75 g of polyoxyethylene glycol monomethyl ether (number average molecular weight 4,000), and cyclohexane By reacting 70 g of dimethanol and 360 g of dicyclohexylmethane diisocyanate at 70 ° C. until NCO% reaches 2.0% by mass, a methyl ethyl ketone solution of a urethane prepolymer (Y4 ′) having an isocyanate group at the terminal is obtained. It was.

An emulsion was obtained by mixing 2340 g of a methyl ethyl ketone solution of the urethane prepolymer (Y4 ′) with 2340 g of pure water and phase inversion emulsifying.

The obtained emulsion is supplied with 430 g of a chain extender aqueous solution containing 43 g of piperazine, and mixed to cause a chain elongation reaction, and by distilling off methyl ethyl ketone, a urethane resin composition having a nonvolatile content of 40% by mass (Y4) Got.

Comparative Example 5 Preparation of Urethane Resin Composition (Y5) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 635 g of polyoxytetramethylene glycol (number average molecular weight 2,000), bisphenol A and ethylene oxide 65 g of a compound (a compound in which R ¹ and R ² in the general formula (1) are a methyl group and m and n are 2), 40 g of dimethylolpropionic acid, 70 g of cyclohexanedimethanol, By reacting 360 g of dicyclohexylmethane diisocyanate at 70 ° C. until the NCO% reached 1.3% by mass, a methyl ethyl ketone solution of a urethane prepolymer (Y5 ′) having an isocyanate group at the molecular end was obtained.

The emulsion solution was obtained by mixing 31 g of triethylamine with 2340 g of the methyl ethyl ketone solution of the urethane prepolymer (Y5 ′), further mixing with 2340 g of pure water, and phase inversion emulsifying.

The obtained emulsion is supplied with 60 g of a chain extender aqueous solution containing 6 g of piperazine and mixed to cause a chain extension reaction, and by distilling off methyl ethyl ketone, a urethane resin composition having a nonvolatile content of 30% by mass (Y5) Got.

[Comparative Example 6] Preparation of urethane resin composition (Y6) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 600 g of polyoxytetramethylene glycol (number average molecular weight 2,000), bisphenol A and ethylene oxide 65 g of a compound (a compound in which R ¹ and R ² in the general formula (1) are methyl groups and m and n are 2 in total) and a polyoxyethyleneoxypropylene random copolymer monobutyl ether (oxy) (Ethylene / oxypropylene mass ratio: 35/65, number average molecular weight 3,700) 75 g, 70 g of cyclohexanedimethanol, and 360 g of dicyclohexylmethane diisocyanate are reacted at 70 ° C. until NCO% reaches 1.3%. By means of a urea having an isocyanate group at the end To obtain a methyl ethyl ketone solution of emissions prepolymer (Y6 ').

2340 g of the methyl ethyl ketone solution of the urethane prepolymer (Y6 ′) was mixed with 2340 g of pure water and phase inversion emulsified, but a stable emulsion could not be obtained, and as a result, a urethane resin composition (Y6) was obtained. I could not.

[Comparative Example 7] Preparation of urethane resin composition (Y7) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 665 g of polycarbonate diol (manufactured by Nippon Polyurethane Industry Co., Ltd., Nipponran N980R, number average molecular weight 2,000) And 70 g of polyoxyethylene glycol monomethyl ether (number average molecular weight 4,000), 70 g of cyclohexanedimethanol, and 360 g of dicyclohexylmethane diisocyanate at 70 ° C. until NCO% reaches 1.8% by mass. A methyl ethyl ketone solution of a urethane prepolymer (Y7 ′) having an isocyanate group at the terminal was obtained.

1650 g of the methyl ethyl ketone solution of the urethane prepolymer (Y7 ′) was mixed with 1650 g of pure water, and phase emulsified to obtain an emulsion.

The obtained emulsion is supplied with 400 g of a chain extender aqueous solution containing 40 g of piperazine and mixed to cause a chain extension reaction, and by distilling off methyl ethyl ketone, a urethane resin composition having a nonvolatile content of 40% by mass (Y7) Got.

[Comparative Example 2] Preparation of urethane resin composition (Y8) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 675 g of polycarbonate diol (manufactured by Nippon Polyurethane Industry Co., Ltd., Nipponran N980R, number average molecular weight 2,000) 65 g of a compound in which 2 mol of ethylene oxide is added to bisphenol A (a compound in which R ¹ and R ² in the general formula (1) are methyl groups and m and n are 2), 70 g of cyclohexanedimethanol, and dicyclohexyl A methyl ethyl ketone solution of urethane prepolymer (Y8 ′) having a terminal isocyanate group was obtained by reacting 360 g of methane diisocyanate at 70 ° C. until NCO% reached 1.3% by mass.

Methyl ethyl ketone solution 2340 g of urethane prepolymer (Y8 ′) having an isocyanate group at the terminal was mixed with 2340 g of pure water and phase-inversion emulsified, but a stable emulsion could not be obtained, and as a result, urethane resin composition (Y8) could not be obtained.

[Comparative Example 3] Preparation of Urethane Resin Composition (Y9) 600 g of polycarbonate diol (Nippon Polyurethane Industry Co., Ltd., Nipponran N980R, number average molecular weight 2,000) in the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate And 65 g of a compound obtained by adding 2 mol of propylene oxide to bisphenol A, 75 g of polyoxyethylene glycol monomethyl ether (number average molecular weight 4,000), 70 g of cyclohexanedimethanol, 360 g of dicyclohexylmethane diisocyanate, and NCO% of 1 By reacting at 70 ° C. until reaching 3 mass%, a methyl ethyl ketone solution of a urethane prepolymer (Y9 ′) having an isocyanate group at the terminal was obtained.

An emulsion was obtained by mixing 2340 g of a methyl ethyl ketone solution of the urethane prepolymer (Y9 ′) with 2340 g of pure water and phase inversion emulsifying.

The obtained emulsion is supplied with 270 g of a chain extender aqueous solution containing 27 g of piperazine, and mixed to cause a chain extension reaction, and by distilling off methyl ethyl ketone, a urethane resin composition having a nonvolatile content of 40% by mass (Y9) Got.

[Comparative Example 10] Preparation of urethane resin composition (Y10) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 600 g of polycarbonate diol (manufactured by Nippon Polyurethane Industry Co., Ltd., Nipponporan N980R, number average molecular weight 2,000) Diol (oxyethylene / oxypropylene mass ratio: 75/25, number average molecular weight 3,000) consisting of a polyoxyethylene polyoxypropylene random copolymer and polyoxyethylene glycol monomethyl ether (number average molecular weight 4) , 000) 75 g, cyclohexane dimethanol 70 g, and dicyclohexylmethane diisocyanate 360 g are reacted at 70 ° C. until NCO% reaches 2.0% by mass, whereby a urethane having an isocyanate group at the terminal is obtained. A methyl ethyl ketone solution of the prepolymer (Y10 ′) was obtained.

The emulsion solution was obtained by mixing 2340 g of the methyl ethyl ketone solution of the urethane prepolymer (Y10 ′) with 2340 g of pure water and carrying out phase inversion emulsification.

By supplying 430 g of a chain extender aqueous solution containing 43 g of piperazine to the obtained emulsified liquid and mixing it to cause a chain extension reaction, and distilling off methyl ethyl ketone, a urethane resin composition having a nonvolatile content of 40% by mass (Y10) Got.

[Comparative Example 11] Preparation of urethane resin composition (Y11) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 635 g of polycarbonate diol (Niporan N980R, number average molecular weight 2,000), bisphenol A and ethylene oxide 65 g of a compound (a compound in which R ¹ and R ² in the general formula (1) are a methyl group and m and n are 2), 40 g of dimethylolpropionic acid, 70 g of cyclohexanedimethanol, By reacting 360 g of dicyclohexylmethane diisocyanate at 70 ° C. until the NCO% reached 1.3% by mass, a methyl ethyl ketone solution of urethane prepolymer (Y11 ′) having an isocyanate group at the terminal was obtained.

The emulsion solution was obtained by mixing 31 g of triethylamine with 2340 g of the methyl ethyl ketone solution of the urethane prepolymer (Y11 ′), further mixing with 2340 g of pure water, and phase-inverting and emulsifying.

The obtained emulsion is supplied with 60 g of a chain extender aqueous solution containing 6 g of piperazine and mixed to cause a chain extension reaction, thereby distilling off methyl ethyl ketone, whereby a urethane resin composition having a nonvolatile content of 30% by mass (Y11) Got.

[Comparative Example 12] Preparation of urethane resin composition (Y12) In the presence of 1170 g of methyl ethyl ketone and 0.1 g of stannous octylate, 600 g of polycarbonate diol (manufactured by Nippon Polyurethane Industry Co., Ltd., Nipponporan N980R, number average molecular weight 2,000) 65 g of a compound in which 2 mol of ethylene oxide is added to bisphenol A (a compound in which R ¹ and R ² in the general formula (1) are methyl groups, and the total of m and n is 2), and polyoxyethyleneoxypropylene random Copolymer monobutyl ether (oxyethylene / oxypropylene mass ratio: 35/65, number average molecular weight 3,700) 75 g, cyclohexane dimethanol 70 g, dicyclohexylmethane diisocyanate 360 g, NCO% reaches 1.3% React at 70 ° C until And afforded the methyl ethyl ketone solution of urethane prepolymer (Y12 ') having a terminal isocyanate group.

2340 g of the methyl ethyl ketone solution of the urethane prepolymer (Y12 ′) was mixed with 2340 g of pure water and phase-inversion emulsified, but a stable emulsion could not be obtained, and as a result, a urethane resin composition (Y12) was obtained. I could not.

100 g of each urethane resin composition obtained in the examples and comparative examples, 0.2 g of TEGO Flow425 (manufactured by Degussa, silicone leveling agent), 0.2 g of TEGO Twin4000 (manufactured by Degussa, silicone antifoaming agent), Each coating agent was mixed with 1 g of BORCHIGEL ALA (manufactured by Borchers, alkali thickening type thickener) for 2 minutes using a mechanical mixer at 2000 rpm, and then defoamed using a vacuum defoamer. Prepared.

100 g of the coating agent was applied onto release paper (155T flat made by Dai Nippon Printing Co., Ltd.) so that the film thickness after application was 150 μm.

Immediately after the coating, a film was prepared by predrying at 70 ° C. for 2 minutes using a Warner Mathis (dryer) and then drying at 150 ° C. for 2 minutes.

[Evaluation method of tensile strength]
<Evaluation by modulus>
The film was peeled from the release paper and cut into a size of 5 mm in width, 7 cm in length, and 30 μm in thickness, which was used as a test film. The tensile strength of the test film was evaluated using Tensilon (manufactured by Shimadzu Corporation, head speed 300 mm / min) in accordance with JIS K-7311.

<Evaluation by elongation>
The film was peeled from the release paper and cut into a size of 5 mm in width, 7 cm in length, and 30 μm in thickness, which was used as a test film. The elongation of the test film was as follows: SHIMADZU AUTOGRAPH “AG-1” (Precision Universal Testing Machine Autograph manufactured by Shimadzu Corporation), test speed: 300 mm / min, between marked lines; 20 mm, between knuckles: 40 mm Measured under conditions.

[Evaluation by flow start temperature]
The film was peeled from the release paper and cut into a size of 5 mm in width, 7 cm in length, and 30 μm in thickness, which was used as a test film. The flow start temperature of the test film was as follows: SHIMADZU CFT-500D-1 (flow tester manufactured by Shimadzu Corporation) die; 1.0 mmφ × 1.0 mmι, load; 98 N, hold time; 10 minutes, heating rate; 3 The measurement was performed under the conditions of ° C / min.

[Odor evaluation method]
The coating agent 100g which consists of a urethane resin composition prepared above was apply | coated on the release paper (Dai Nippon Printing Co., Ltd. product 155T flat) so that the film thickness after application | coating might be set to 150 micrometers.

Immediately after the application, when drying at 70 ° C. for 2 minutes using a Warner Mathis (dryer), it was determined whether or not one person smelled at a position 50 cm high from the air outlet of the dryer. .

The urethane resin compositions obtained in Examples 1 and 6 were excellent in dispersion stability in water, had no odor due to the neutralizing agent, and were able to form a film excellent in tensile strength. Although the urethane resin composition obtained in Example 2 was confirmed to have a decreased flow initiation temperature due to the excessive use of polyoxyethylene glycol monomethyl ether, it had excellent dispersion stability, no odor, and good tensile strength. It was possible to form a film with The urethane resin compositions obtained in Examples 3 and 8 were also excellent in dispersion stability, had no odor, and could form a film with good tensile strength. The urethane resin compositions obtained in Examples 4 and 9 have an alkoxypolyoxyalkylene structure (a1) in the side chain of the urethane resin, have excellent dispersion stability, no odor, and good tensile strength. It was possible to form the provided film.

The urethane resin compositions of Examples 5 and 10 obtained by using 10 moles of bisphenol added with ethylene oxide also form a film with excellent dispersion stability, no odor, and good tensile strength. It was possible to do.

The urethane resin compositions of Examples 6 and 11 obtained by using monobutyl ether of polyoxyethylene polyoxypropylene random copolymer also have excellent dispersion stability, no odor, and a film having good tensile strength. It was possible to form.

The urethane resin compositions of Comparative Examples 1, 3, 4, 7, 9, and 10 that do not have the structure represented by the general formula (1) caused a significant decrease in tensile strength. The urethane resin compositions of Comparative Examples 2 and 8 having the structure represented by the general formula (1) but not having the alkoxypolyoxyalkylene structure (a1) can maintain good water dispersion stability. Cause aggregation.

The urethane resin compositions described in Comparative Examples 5 and 11 having a carboxylate group formed by neutralizing a carboxyl group as a hydrophilic group can form a film having good water dispersion stability and excellent tensile strength. However, it caused odor caused by the neutralizing agent.

In addition, the urethane resin compositions of Comparative Examples 6 and 12 having an alkoxypolyoxyalkylene structure in which the mass ratio of oxyethylene units is 35% by mass cannot maintain good water dispersion stability, and cause aggregation and the like. Caused.

Claims

A urethane resin (A) having an alkoxypolyoxyalkylene structure (a1) having 40% by mass to 100% by mass of oxyethylene units and a structure (a2) represented by the following general formula (1), and an aqueous medium (B ) -Containing urethane resin composition, wherein the alkoxypolyoxyalkylene structure (a1) is present at the end of the urethane resin (A) or the side chain of the urethane resin (A). Urethane resin composition.

(R 1 and R 2 in the general formula (1) each independently represents a hydrogen atom or an alkyl group. M represents an average value of 0 to 20, n represents an average value of 0 to 20, And the sum of n represents an average value of 1 to 40.)
The urethane resin (A) has the alkoxypolyoxyalkylene structure (a1) in a range of 0.1% by mass to 25% by mass with respect to the entire urethane resin (A). Urethane resin composition.
The urethane resin (A) has a structure (a2) represented by the general formula (1) in a range of 0.1% by mass to 25% by mass with respect to the entire urethane resin (A). Item 4. The urethane resin composition according to Item 1.
A coating agent comprising the urethane resin composition according to any one of claims 1 to 3.
An article comprising a film formed using the urethane resin composition according to any one of claims 1 to 3.
A leather-like sheet obtained by impregnating a fiber base material with the urethane resin composition according to any one of claims 1 to 3.
A leather-like sheet having at least a layer composed of an impregnated base material obtained by impregnating a fiber base material with the urethane resin composition according to any one of claims 1 to 3, and a skin layer.