JP6588203B2 - Block polyisocyanate composition - Google Patents

Description

  The present invention relates to a block polyisocyanate composition and a method for producing the same, an aqueous dispersion, a coating composition, and a substrate.

  A coating film formed from a urethane coating composition using polyisocyanate as a curing agent has excellent chemical resistance, flexibility, and the like. In particular, when a polyisocyanate obtained from an aliphatic diisocyanate or an alicyclic diisocyanate is used as a curing agent, the coating film is further excellent in weather resistance. Therefore, the urethane-based coating composition is used as a room temperature curable two-component urethane coating and a thermosetting one-component urethane coating for construction, heavy protection, automobiles, industrial use and repairs thereof.

  On the other hand, in order to reduce the burden on the global environment, water-based systems have been studied for polyisocyanate compositions used as curing agents in urethane-based paint compositions. Water-based systems are being studied for block polyisocyanate compositions that are often used as one-component urethane paints.

  Examples of a method for producing an aqueous block polyisocyanate composition include a method of adding a hydrophilic compound to the block polyisocyanate. Moreover, the water-system block polyisocyanate composition obtained by adding an ethylenelen oxide to the block polyisocyanate which has an isocyanurate structure (for example, refer patent document 1, patent document 2) is mentioned. Furthermore, the water-based block polyisocyanate composition manufactured using the polyisocyanate obtained by mixing the polyisocyanate which has an allophanate structure with the polyisocyanate which has an isocyanurate structure (for example, patent document 3) is mentioned.

Japanese Patent Laid-Open No. 62-151419 JP-A-2-3465 JP 2004-75782 A

  However, the block polyisocyanate composition to which the hydrophilic compound is added cannot obtain a sufficient crosslinked coating film due to the decrease in the number of functional groups of the isocyanate group by adding the hydrophilic compound. On the other hand, the water-based block polyisocyanate compositions described in Patent Document 1 and Patent Document 2 are relatively excellent in terms of heat resistance. Moreover, the water-system block polyisocyanate composition of the said patent document 3 is comparatively excellent in the point of a weather resistance, a softness | flexibility, and adhesiveness.

  However, the water-based block polyisocyanate compositions described in Patent Document 1 and Patent Document 2 have a problem that dispersibility in water and water-based paints is insufficient. Moreover, since the polyisocyanate composition described in Patent Document 3 has many allophanate groups, there is a problem that the average number of functional groups of the isocyanate groups of the polyisocyanate is low, resulting in poor heat resistance when used as a coating composition.

  Therefore, an object of the present invention is to provide an aqueous block polyisocyanate composition which is excellent in water dispersibility and excellent in smoothness and heat resistance when used as a coating composition.

  As a result of intensive studies to solve the above-described problems of the prior art, the present inventors have found that a specific first polyisocyanate, a specific second polyisocyanate, a poly (oxyalkylene) glycol monoalkyl ether, and a block The block polyisocyanate composition obtained by reaction with an agent and having a viscosity within a specific range is found to have excellent water dispersibility and excellent smoothness and heat resistance when used as a coating composition. The invention has been completed.

That is, the present invention is as follows.
[1] Obtained by reacting a polyisocyanate mixture containing a first polyisocyanate and a second polyisocyanate, a poly (oxyalkylene) glycol monoalkyl ether, and a blocking agent,
The first polyisocyanate is obtained from at least one selected from the group consisting of aliphatic diisocyanates and alicyclic diisocyanates, and the average number of functional groups of isocyanate groups of the first polyisocyanate is 4.0 or more and 10 And
The second polyisocyanate is obtained from at least one selected from the group consisting of aliphatic diisocyanates and alicyclic diisocyanates, and the average number of functional groups of isocyanate groups of the second polyisocyanate is 2.5 or more and 3 .9 or less,
The block polyisocyanate composition whose viscosity in 40 degreeC is 20,000 mPa * s or more and 200,000 mPa * s or less.
[2] The first polyisocyanate is obtained from at least an aliphatic diisocyanate,
The block polyisocyanate composition according to [1], wherein the second polyisocyanate is obtained from at least an aliphatic diisocyanate.
[3] The block polyisocyanate composition is a total (100 mol) of isocyanurate group, allophanate group, biuret group, urethane group, uretdione group, iminooxadiazinedione group and urea group of the block polyisocyanate composition. %), The block polyisocyanate composition according to [1] or [2], wherein the content of the isocyanurate group is 5 mol% or more and 80 mol% or less.
[4] The block polyisocyanate composition contains 25% by mass to 50% by mass of an isocyanurate trimer with respect to the total amount (100% by mass) of the block polyisocyanate composition. ] The block polyisocyanate composition of any one of.
[5] The block polyisocyanate composition has a molar ratio of allophanate groups of the block polyisocyanate composition to isocyanurate groups of the block polyisocyanate composition of 10/90 or more and 90/10 or less. The block polyisocyanate composition according to any one of 1] to [4].
[6] The block polyisocyanate composition according to any one of [1] to [5], wherein the poly (oxyalkylene) glycol monoalkyl ether has a number average molecular weight of 200 or more and 2000 or less.
[7] Any one of [1] to [6], wherein the blocking agent includes at least one selected from the group consisting of oxime compounds, pyrazole compounds, active methylene compounds, amine compounds, and caprolactam compounds. 2. The block polyisocyanate composition according to 1.
[8] A mixing step of mixing the first polyisocyanate and the second polyisocyanate to obtain a polyisocyanate mixture;
Reacting the polyisocyanate mixture with a poly (oxyalkylene) glycol monoalkyl ether to obtain a polyisocyanate composition;
A second reaction step of reacting the polyisocyanate composition with a blocking agent to obtain a blocked polyisocyanate composition, wherein the first polyisocyanate is composed of an aliphatic diisocyanate and an alicyclic diisocyanate. It is obtained from at least one selected, and the average number of functional groups of the isocyanate group of the first polyisocyanate is 4.0 or more and 10 or less,
The second polyisocyanate is obtained from at least one selected from the group consisting of aliphatic diisocyanates and alicyclic diisocyanates, and the average number of functional groups of isocyanate groups of the second polyisocyanate is 2.5 or more and 3 .9 or less,
The manufacturing method of the block polyisocyanate composition whose viscosity in 40 degreeC of the said block polyisocyanate composition is 20,000 mPa * s or more and 200,000 mPa * s or less.
[9] The first polyisocyanate is obtained from at least an aliphatic diisocyanate,
The production method according to [8], wherein the second polyisocyanate is obtained from at least an aliphatic diisocyanate.
[10] The block polyisocyanate composition is a total (100 mol) of isocyanurate group, allophanate group, biuret group, urethane group, uretdione group, iminooxadiazinedione group and urea group of the block polyisocyanate composition. %)), The content of the isocyanurate group is 5 mol% or more and 80 mol% or less, [8] or [9].
[11] The block polyisocyanate composition contains 25% by mass to 50% by mass of an isocyanurate trimer with respect to the total amount (100% by mass) of the block polyisocyanate composition. ] The manufacturing method of any one of.
[12] In the block polyisocyanate composition, the molar ratio of the allophanate group of the block polyisocyanate composition to the isocyanurate group of the block polyisocyanate composition is from 10/90 to 90/10. [8] The production method according to any one of [11].
[13] The production method according to any one of [8] to [12], wherein the poly (oxyalkylene) glycol monoalkyl ether has a number average molecular weight of 200 or more and 2000 or less.
[14] Any of [8] to [13], wherein the blocking agent includes at least one selected from the group consisting of an oxime compound, a pyrazole compound, an active methylene compound, an amine compound, and a caprolactam compound. 2. The production method according to 1.
[15] The manufacturing method according to any one of [8] to [14], wherein the following relational expression (1) is satisfied in the mixing step.
10/90 ≦ first polyisocyanate / second polyisocyanate ≦ 90/10 (1)
(In Formula (1), 1st polyisocyanate and 2nd polyisocyanate represent each mass.)
[16] In the first reaction step, the poly (oxyalkylene) glycol monoalkyl ether is 15% by mass to 40% by mass with respect to the solid content (100% by mass) of the block polyisocyanate composition. The manufacturing method according to any one of [8] to [15].
[17] An aqueous dispersion comprising the blocked polyisocyanate composition according to any one of [1] to [7] and water.
[18] A coating composition comprising the aqueous dispersion according to [17] and at least one selected from the group consisting of polyols, polyamines, and alkanolamines.

  According to the block polyisocyanate composition of the present invention, excellent water dispersibility and excellent smoothness and heat resistance when used as a coating composition can be obtained.

  Hereinafter, a mode for carrying out the present invention (hereinafter referred to as “the present embodiment”) will be described in detail. The following embodiments are examples for explaining the present invention, and are not intended to limit the present invention to the following contents. The present invention can be variously modified without departing from the gist thereof. In this specification, the quantity of the specific functional group which a composition or a compound has can be represented by "mol%" and "molar ratio." That is, the dimension of the value obtained by dividing the number of specific functional groups possessed by the composition or compound by the Avogadro number is defined as mole. Thus, the amount of the specific functional group is expressed as “mol%” and “molar ratio” with respect to the amount of the other specific functional group. In addition, the specific functional group which a composition has means the specific functional group which the compound contained in a composition has.

  The block polyisocyanate composition of the present embodiment is obtained by reacting a polyisocyanate mixture containing a first polyisocyanate and a second polyisocyanate, a poly (oxyalkylene) glycol monoalkyl ether, and a blocking agent, The viscosity at 40 ° C. is 20,000 mPa · s or more and 200,000 mPa · s or less. The first polyisocyanate is obtained from at least one selected from the group consisting of aliphatic diisocyanates and alicyclic diisocyanates, and the average number of functional groups of isocyanate groups of the first polyisocyanate is 4.0 or more. 10 or less. Furthermore, the second polyisocyanate is obtained from at least one selected from the group consisting of aliphatic diisocyanates and alicyclic diisocyanates, and the average number of functional groups of the isocyanate groups of the second polyisocyanate is 2.5 or more. 3.9 or less.

  The viscosity at 40 ° C. of the block polyisocyanate composition of this embodiment is from 20,000 mPa · s to 200,000 mPa · s, preferably from 30,000 mPa · s to 180,000 mPa · s, and preferably from 50,000 mPa · s. More preferably, it is s or more and 150,000 mPa · s or less. When the viscosity is 200,000 mPa · s or less, the coating composition has excellent smoothness. When the viscosity is 20,000 mPa · s or more, the curability when used as a coating composition is excellent.

  By adjusting the mixing ratio of the polyisocyanate, the molecular weight of the poly (oxyalkylene) glycol monoalkyl ether, the amount of modification of the blocking agent, and the type, a block polyisocyanate composition having a viscosity in the above range can be obtained. For example, the viscosity of the block polyisocyanate composition can be increased by increasing the mixing ratio of the polyfunctionalized polyisocyanate. Further, by reducing the molecular weight of the poly (oxyalkylene) glycol monoalkyl ether, the viscosity of the block polyisocyanate composition can be increased when it is modified at the same molar ratio with respect to the isocyanate group of the polyisocyanate. The viscosity of the block polyisocyanate composition is measured by the method described in the examples described later.

<Polyisocyanate>
The block polyisocyanate composition of the present embodiment is a first polyisocyanate (hereinafter also referred to as “polyisocyanate (A)”) and a second polyisocyanate (hereinafter also referred to as “polyisocyanate (B)”). From a polyisocyanate mixture (hereinafter also referred to as “polyisocyanate mixture”).

  The polyisocyanate (A) of this embodiment is obtained from at least one selected from the group consisting of aliphatic diisocyanates and alicyclic diisocyanates, and the average number of functional groups of isocyanate groups possessed by the polyisocyanate (A) is 4.0. It is 10 or less and preferably 4.5 or more and 9.0 or less. When the average functional group number is 4.0 or more, the water dispersibility tends to be excellent, and when the average functional group number is 10 or less, the smoothness tends to be excellent. In order to obtain the polyisocyanate (A) having the average number of functional groups in such a range, it is not particularly limited. For example, diisocyanate and a polyol may be reacted to be polyfunctionalized. The form obtained by reacting the diisocyanate and the polyol is preferably an allophanate group. The average number of functional groups of the polyisocyanate (A) is measured by the method described in Examples described later.

  The polyisocyanate (A) preferably has an allophanate group. From the viewpoint of curability, the molar ratio of the allophanate group to the isocyanurate group of the polyisocyanate (A) (allophanate group / isocyanurate group) is preferably 75/25 or more and 50/50 or less.

  The viscosity of the polyisocyanate (A) is preferably 3000 mPa · s or more and 40000 mPa · s or less at 25 ° C. from the viewpoint of smoothness.

  The polyisocyanate (B) of the present embodiment is obtained from at least one selected from the group consisting of aliphatic diisocyanates and alicyclic diisocyanates, and the average number of functional groups of isocyanate groups that the polyisocyanate (B) has is 2.5 or more. 3.9 or less, preferably 3.0 or more and 3.7 or less. When the average functional group number is 2.5 or more, the curability tends to be excellent, and when the average functional group number is 3.9 or less, the heat resistance tends to be excellent. In order to obtain the polyisocyanate (B) having the average number of functional groups in such a range, it is not particularly limited, but for example, a diisocyanate may be subjected to an isocyanuration reaction. The average number of functional groups of the polyisocyanate (B) is measured by the method described in Examples described later.

  The isocyanurate group content of the polyisocyanate (B) is, in terms of heat resistance, isocyanurate groups, allophanate groups, burette groups, urethane groups, uretdione groups, iminooxadiazinedione groups in the polyisocyanate (B), And it is preferable that it is 60 mol% or more with respect to the sum total (100 mol%) of a urea group.

  The content of the isocyanurate trimer is preferably 30% by mass or more and 90% by mass or less with respect to the total amount (100% by mass) of the polyisocyanate (B) from the viewpoint of smoothness and crosslinkability.

  The polyisocyanate (A) is preferably obtained from at least an aliphatic diisocyanate, and the polyisocyanate (B) is preferably obtained from at least an aliphatic diisocyanate. The polyisocyanate (A) and the polyisocyanate (B) are obtained from the aliphatic diisocyanate, so that an excessive increase in viscosity when the block polyisocyanate composition is obtained can be suppressed and adjusted to a preferable viscosity range. .

  Aliphatic diisocyanate and alicyclic diisocyanate are those having no benzene ring in the structure. As the aliphatic diisocyanate, those having 4 to 30 carbon atoms are preferable. Specifically, tetramethylene-1,4-diisocyanate, pentamethylene-1,5-diisocyanate, hexamethylene diisocyanate (hereinafter referred to as “HDI”). And 2,2,4-trimethyl-hexamethylene-1,6-diisocyanate, lysine diisocyanate, and the like. As the alicyclic diisocyanate, those having 8 to 30 carbon atoms are preferable. Specifically, isophorone diisocyanate (hereinafter also referred to as “IPDI”), 1,3-bis (isocyanatomethyl) -cyclohexane, 4, Examples include 4′-dicyclohexylmethane diisocyanate. Among these, aliphatic diisocyanate is preferable and HDI is more preferable from the viewpoint of weather resistance and industrial availability. These aliphatic diisocyanates and alicyclic diisocyanates may be used alone or in combination of two or more.

  The polyisocyanate mixture of the present embodiment can have an isocyanurate group and an allophanate group, and other functional groups include biuret group, urethane group, uretdione group, iminooxadiazinedione group, urea group, oxadia It can also have a gintrione group at the same time. The polyisocyanate mixture preferably has isocyanurate groups and allophanate groups.

The isocyanurate group refers to a group represented by the following formula (2).

  The block polyisocyanate composition is based on the total (100 mol%) of the isocyanurate group, allophanate group, biuret group, urethane group, uretdione group, iminooxadiazinedione group, and urea group of the block polyisocyanate composition. In view of water dispersibility, the content of the isocyanurate group is preferably 5 mol% or more and 80% mol or less, more preferably 10 mol% or more and 70 mol% or less, and more preferably 15 mol% or more. More preferably, it is 60 mol% or less, and still more preferably 20 mol% or more and 60 mol% or less. It exists in the tendency which is excellent in water dispersibility because content of an isocyanurate group is 80 mol% or less. Moreover, it exists in the tendency which is excellent in heat resistance because content of an isocyanurate group is 5 mol% or more. The content of isocyanurate groups is measured by the method described in the examples described later.

  The polyisocyanate mixture and the block polyisocyanate composition preferably contain an isocyanurate trimer from the viewpoint of curability. The isocyanurate trimer is a structure composed of three molecules of aliphatic diisocyanate and / or alicyclic diisocyanate and having one isocyanurate group.

  The block polyisocyanate composition preferably contains 25 mass% or more and 50 mass% or less of isocyanurate trimer with respect to the total amount (100 mass%) of the block polyisocyanate composition, and is 26 mass% or more and 45 mass%. %, More preferably 27 mass% or more and 40 mass% or less, further preferably 28 mass% or more and 40 mass% or less, and even more preferably 30 mass% or more and 40 mass% or less. preferable. By containing 25% by mass or more of isocyanurate trimer, the curability tends to be excellent when used as a coating composition. Moreover, it is in the tendency which is excellent in storage stability by containing 50 mass% or less of isocyanurate trimers. The content of the isocyanurate trimer can be measured by the method described in Examples described later.

The allophanate group is a group formed by a reaction between a hydroxyl group of alcohol and an isocyanate group, and refers to a group represented by the following formula (3).

  The allophanate group of the polyisocyanate mixture is formed by reaction with the hydroxyl group of the alcohol. Specific examples of the alcohol include monoalcohols, polyols, and mixtures of these alcohols.

  Specific examples of the monoalcohol include ethanol, 1-propanol, 2-propanol, 1-butanol, 2-methyl-1-propanol, 2-butanol, 1-pentanol, 3-methyl-1-butanol, 2- Methyl-1-butanol, 2,2dimethyl-1-propanol, 2-pentanol, 3-methyl-2-butanol, 3-pentanol, 2-methyl-2-butanol, 1-hexanol, 2-methyl-1 -Pentanol, 3-methyl-1-pentanol, 4-methyl-1-pentanol, 2,2-dimethyl-1-butanol, 2-ethyl-1-butanol, 2-hexanol, 3-hexanol, 3 -Methyl-2-pentanol, 4-methyl-2-pentanol, 2-methyl-3-pentanol, 3,3-dimethyl-2-butane Nord, 1-heptanol, 2-heptanol, 3-heptanol, 4-heptanol, 1-octanol, 6-methyl-1-heptanol, 2-ethylhexanol. Monoalcohols may be used alone or in combination of two or more.

  The carbon number of the monoalcohol is preferably 4 or more and 10 or less, and more preferably 4 or more and 8 or less. In addition, from the viewpoint of more effectively and reliably achieving the operational effects of the present embodiment, the monoalcohol is preferably a primary alcohol, and more preferably has a branched structure.

  The polyisocyanate mixture preferably contains 0.1% by mass or more and 10% by mass or less, and 0.1% by mass or more and 7.5% by mass of monoalcohol based on the total amount of the polyisocyanate mixture (100% by mass). More preferably, the content is less than or equal to mass%. When the mass unit of the monoalcohol is 10% by mass or less, the curability when used as a coating composition tends to be excellent.

  Examples of the polyol include non-polymerized polyol and polymerized polyol. The non-polymerized polyol is a polyol that does not undergo polymerization history, and the polymerized polyol is a polyol obtained by polymerizing monomers.

  Specific examples of the non-polymerized polyol include polyhydric alcohols such as diols, triols, and tetraols. Examples of the diol include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3- Butanediol, 1,4-butanediol, 2,3-butanediol, 2-methyl-1,2-propanediol, 1,5-pentanediol, 2-methyl-2,3-butanediol, 1,6- Hexanediol, 1,2-hexanediol, 2,5-hexanediol, 2-methyl-2,4-pentanediol, 2,3-dimethyl-2,3-butanediol, 2-ethyl-hexanediol, 1, 2-octanediol, 1,2-decanediol, 2,2,4-trimethyl Nthanediol, 2-butyl-2-ethyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, and examples of triols include glycerin and trimethylolpropane, and tetraols. An example is pentaerythritol.

  Specific examples of the polymerization polyol include aliphatic hydrocarbon polyols, polyether polyols, polyester polyols, epoxy resins, fluorine polyols, acrylic polyols, and polycarbonate polyols. Aliphatic hydrocarbon polyols include terminally hydroxylated polybutadiene and hydrogenated products thereof.

  As polyether polyols, a polyhydric alcohol or a mixture of two or more thereof using a metal hydroxide, a strongly basic catalyst, a complex metal cyanide complex, etc., an alkylene oxide or a mixture of two or more thereof, Polyether polyols obtained by random and / or block addition; polyether polyols obtained by reacting an alkylene oxide with a polyamine compound such as ethylenediamine; obtained by polymerizing acrylamide or the like using these polyether polyols as a medium And so-called polymer polyols.

  Examples of the metal hydroxide include lithium, sodium, and potassium hydroxide. Examples of the strongly basic catalyst include alcoholates and alkylamines. Examples of the complex metal cyanide complex include metal porphyrins and zinc hexacyanocobaltate complexes. Examples of the alkylene oxide or a mixture of two or more thereof include propylene oxide, butylene oxide, cyclohexene oxide, and styrene oxide.

  Polyester polyols include those obtained by a condensation reaction of a dibasic acid or a mixture of two or more thereof with a polyhydric alcohol or a mixture of two or more thereof, and ε-caprolactone using a polyhydric alcohol as a starting compound. And polycaprolactones obtained by ring-opening polymerization. The dibasic acid or a mixture of two or more thereof is selected from the group consisting of succinic acid, adipic acid, sebacic acid, dimer acid, maleic anhydride, phthalic anhydride, isophthalic acid and carboxylic acid represented by terephthalic acid. At least one selected from the above. Examples of the polyhydric alcohol or a mixture of two or more thereof include at least one selected from the group consisting of ethylene glycol, propylene glycol, diethylene glycol, neopentyl glycol, trimethylolpropane, and glycerin.

  Examples of the polyhydric alcohol or a mixture of two or more thereof include non-saccharides, sugar alcohol compounds, monosaccharides, disaccharides, trisaccharides, and tetrasaccharides. Non-saccharides include diglycerin, ditrimethylolpropane, pentaerythritol, and dipentaerythritol. Examples of sugar alcohol compounds include erythritol, D-threitol, L-arabinitol, ribitol, xylitol, sorbitol, mannitol, galactitol, and rhamnitol. Monosaccharides include arabinose, ribose, xylose, glucose, mannose, galactose, fructose, sorbose, rhamnose, fucose, and ribodesose. Examples of disaccharides include trehalose, sucrose, maltose, cellobiose, gentiobiose, lactose, and melibiose. Examples of trisaccharides include raffinose, gentianose, and meletitol. Examples of the tetrasaccharide include stachyose.

  Epoxy resins include glycidyl ether type epoxy resins (for example, bisphenol A type, bisphenol F type, bisphenol AD type, phenol novolac type, cresol novolac type), cyclic aliphatic epoxy resins (for example, alicyclic diepoxy acetal, Alicyclic diepoxy adipate), glycidyl ester resins (eg, diglycidyl phthalate, diglycidyl tetrahydrophthalate, diglycidyl hexahydrophthalate, diglycidyl-p-oxybenzoic acid, dimer acid glycidyl ester), Glycidylamine resins (N, N-diglycidylaniline, tetraglycidyldiaminodiphenylmethane, triglycidyl-p-aminophenol), heterocyclic epoxy resins (for example, diglycidylhydan Inn, hydantoin type epoxy resins such as glycidyl glycidoxy alkyl hydantoin, triglycidyl isocyanurate), and amino compounds of these epoxy resins, modified resins and the like with a polyamide compound.

  Acrylic polyols include acrylic acid esters with active hydrogen such as 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and 2-hydroxybutyl acrylate, acrylic monoester or methacrylic monoester of glycerin. , And at least one selected from the group consisting of trimethylolpropane acrylic acid monoester or methacrylic acid monoester, methyl acrylate, ethyl acrylate, isopropyl acrylate, -n-butyl acrylate, acrylate-2- Acrylic acid esters such as ethylhexyl, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxybutyl methacrylate, 3-hydroxypropyl methacrylate, 4-hydroxymethacrylate Methacrylic acid esters having active hydrogen such as chill and methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, -n-butyl methacrylate, isobutyl methacrylate, n-hexyl methacrylate, lauryl methacrylate At least one selected from the group consisting of unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid and itaconic acid, unsaturated amides such as acrylamide, N-methylolacrylamide and diacetoneacrylamide, and methacrylic acid Acrylic polyol resin obtained by polymerization in the presence or absence of at least one selected from the group consisting of other polymerizable monomers such as glycidyl acid, styrene, vinyl toluene, vinyl acetate, acrylonitrile, and dibutyl fumarate. And the like.

  Fluorine polyols are polyols containing fluorine in the molecule, and examples thereof include copolymers such as fluoroolefin, cyclovinyl ether, hydroxyalkyl vinyl ether, and monocarboxylic acid vinyl ester.

  Examples of the polycarbonate polyols include polymers obtained by polymerizing carbonate esters such as alkylene carbonates such as ethylene carbonate and dialkyl carbonates such as diethyl carbonate.

  Among these polyols, non-polymerized polyols such as polyhydric alcohols, polyether polyols, and polyester polyols are preferable, and polycaprolactones are more preferable. These polyols may be used alone or in combination of two or more.

  In the block polyisocyanate composition, the molar ratio of the allophanate group of the block polyisocyanate composition to the isocyanurate group of the block polyisocyanate composition (allophanate group / isocyanurate group) is 10/90 or more and 90/10 or less. It is preferably 20/80 or more and 80/20 or less, more preferably 30/70 or more and 70/30 or less, and even more preferably 40/60 or more and 60/40 or less. preferable. When (allophanate group / isocyanurate group) is 90/10 or less, the water dispersibility tends to be excellent. Moreover, it exists in the tendency which is excellent in heat resistance when it uses as a coating composition because (allophanate group / isocyanurate group) is 10/90 or more. (Allophanate group / isocyanurate group) can be measured by the method described in Examples described later.

  The average number of functional groups of the polyisocyanate mixture is preferably 2.6 or more and 9.5 or less, more preferably 2.8 or more and 8.5 or less, and more preferably 2.8 or more and 7.5 or less. More preferably, it is 3.0 or more and 6.5 or less. When the average functional group number is 9.5 or less, the viscosity tends to be excellent. Moreover, it exists in the tendency which is excellent in sclerosis | hardenability when it uses as a coating composition because an average functional group number is 2.6 or more. The average number of functional groups of the polyisocyanate mixture is measured by the method described in Examples described later, as in the case of polyisocyanate (A) and polyisocyanate (B).

<Poly (oxyalkylene) glycol monoalkyl ether>
The block polyisocyanate composition of this embodiment is obtained from poly (oxyalkylene) glycol monoalkyl ether. Examples of the poly (oxyalkylene) glycol monoalkyl ether include a polyethylene glycol compound having at least three consecutive ethylene oxide groups.

  The number average molecular weight of the poly (oxyalkylene) glycol monoalkyl ether is preferably 200 or more and 2000 or less, more preferably 300 or more and 1500 or less, further preferably 400 or more and 1200 or less, and more preferably 400 or more and 1000 or less. More preferably, it is as follows. When the number average molecular weight is 200 or more, water dispersibility tends to be excellent. Moreover, it exists in the tendency which is excellent in water resistance when it is used as a coating composition because a number average molecular weight is 2000 or less. The number average molecular weight can be measured by the method described in Examples described later.

  The polyethylene glycol-based compound having an ethylene oxide group has an ethylene oxide repeating unit when it has other oxyalkylene groups, specifically, an oxypropylene group, an oxystyrene group, etc. Calculate the unit. In this case, the molar ratio of the ethylene oxide group is preferably 60 mol% or more, more preferably 70 mol% or more, and more preferably 80 mol% with respect to all oxyalkylene groups of one molecule of the polyethylene glycol compound. % Or more is more preferable. It exists in the tendency which is excellent in the compounding property to a water-based coating material because a molar ratio is 60 mol% or more.

  Specific examples of such polyethylene glycol compounds include monoalkoxy polyethylene glycol, polyethylene glycol and triol, so-called pluronic-type polypropylene glycol and triol obtained by addition polymerization of ethylene oxide at the end of polypropylene glycol, polyoxypropylene polyoxy Mention may be made of ethylene copolymer diols and triols, polyoxypropylene polyoxyethylene block polymer diols and triols. Among these, monoalkoxy polyethylene glycol and polyethylene glycol are preferable, and monoalkoxy polyethylene glycol is more preferable.

  Monoalkoxy polyethylene glycol is obtained by adding an alcohol to one end of polyethylene glycol. As the alcohol that can be added, those having 1 to 8 carbon atoms are preferred, those having 1 to 6 carbon atoms are more preferred, those having 1 to 4 carbon atoms are more preferred, and methanol and ethanol are still more preferred. Examples of the polyethylene glycol include trade names “PEG200”, “PEG300”, “PEG400”, “PEG600”, “PEG1000”, and “PEG2000” manufactured by NOF Corporation. In addition, as commercial products of monoalkoxy polyethylene glycol, trade names “Niox M400”, “Uniox M550”, “Uniox M1000”, “Uniox M2000” manufactured by Nippon Oil & Fats Co., Ltd., trade names of Nippon Emulsifier Co., Ltd. "MPG-081" is mentioned.

<Blocking agent>
The block polyisocyanate composition of this embodiment is obtained from a blocking agent. A blocking agent is a compound having one active hydrogen in the molecule. Specifically, an alcohol compound, an alkylphenol compound, a phenol compound, an active methylene compound, a mercaptan compound, an acid amide compound, an acid Examples include imide compounds, imidazole compounds, urea compounds, oxime compounds, amine compounds, imide compounds, and pyrazole compounds.

More specific examples of the blocking agent include the following blocking agents.
(1) Alcohol compounds: methanol, ethanol, 2-propanol, n-butanol, sec-butanol, 2-ethyl-1-hexanol, 2-methoxyethanol, 2-ethoxyethanol, and 2-butoxyethanol.
(2) Alkylphenol compounds: mono- and dialkylphenols having an alkyl group having 4 or more carbon atoms as a substituent, such as n-propylphenol, i-propylphenol, n-butylphenol, sec-butylphenol, t-butylphenol, n Monoalkylphenols such as hexylphenol, 2-ethylhexylphenol, n-octylphenol, n-nonylphenol; di-n-propylphenol, diisopropylphenol, isopropylcresol, di-n-butylphenol, di-t-butylphenol, di-sec -Dialkylphenols such as butylphenol, di-n-octylphenol, di-2-ethylhexylphenol, and di-n-nonylphenol.
(3) Phenol compounds: phenol, cresol, ethylphenol, styrenated phenol, hydroxybenzoic acid ester.
(4) Active methylene compounds: dimethyl malonate, diethyl malonate, methyl acetoacetate, ethyl acetoacetate, acetylacetone.
(5) Mercaptan compounds: butyl mercaptan, dodecyl mercaptan.
(6) Acid amide compounds: acetanilide, acetic acid amide, ε-caprolactam, δ-valerolactam, γ-butyrolactam.
(7) Acid imide compounds: succinimide and maleic imide.
(8) Imidazole compounds: imidazole and 2-methylimidazole.
(9) Urea compounds: urea, thiourea, ethylene urea.
(10) Oxime compounds: formaldoxime, acetaldoxime, acetoxime, methyl ethyl ketoxime, cyclohexanone oxime.
(11) Amine compounds: diphenylamine, aniline, carbazole, di-n-propylamine, diisopropylamine, isopropylethylamine.
(12) Imine compounds: ethyleneimine, polyethyleneimine.
(13) Pyrazole compounds: pyrazole, 3-methylpyrazole, 3,5-dimethylpyrazole.

  These blocking agents may be used alone or in combination of two or more.

  The blocking agent preferably contains at least one selected from the group consisting of an oxime compound, a pyrazole compound, an active methylene compound, an amine compound, and a caprolactam compound. From the viewpoint of storage stability, the oxime compound, Aliphatic amine compounds are more preferred.

[Method for producing block polyisocyanate composition]
The manufacturing method of the block polyisocyanate composition of this embodiment has a mixing process, a 1st reaction process, and a 2nd reaction process. The said mixing process is a process of mixing polyisocyanate (A) and polyisocyanate (B) and obtaining a polyisocyanate mixture. The first reaction step is a step of obtaining a polyisocyanate composition by reacting a polyisocyanate mixture with a poly (oxyalkylene) glycol monoalkyl ether. The said 2nd reaction process is a process of making a polyisocyanate composition and a blocking agent react, and obtaining a block polyisocyanate composition. Further, the polyisocyanate (A) is obtained from at least one selected from the group consisting of aliphatic diisocyanates and alicyclic diisocyanates, and the average number of functional groups of the isocyanate groups possessed by the polyisocyanate (A) is 4.0 or more and 10 or less. It is. Furthermore, the polyisocyanate (B) is obtained from at least one selected from the group consisting of aliphatic diisocyanates and alicyclic diisocyanates, and the average number of functional groups of the isocyanate groups of the polyisocyanate (B) is 2.5 or more and 3 .9 or less. In addition, the viscosity at 40 ° C. of the block polyisocyanate composition is from 20,000 mPa · s to 200,000 mPa · s. An example of the manufacturing method will be described in detail below. It demonstrates from the manufacturing method of polyisocyanate (A) and polyisocyanate (B).

[Production method of polyisocyanate]
Specifically, as a method for producing the polyisocyanate (A) and polyisocyanate (B) of the present embodiment, an isocyanate of the above-described aliphatic diisocyanate and diisocyanate of alicyclic diisocyanate (hereinafter also simply referred to as “diisocyanate”). An isocyanurate-forming reaction that forms an isocyanurate group derived from a group and an allophanate-forming reaction that forms an allophanate group derived from an isocyanate group and a hydroxyl group of an alcohol are carried out in the presence of excess diisocyanate and unreacted after the reaction is completed. It can be obtained by removing the diisocyanate.

  The polyisocyanate (A) is obtained from at least an aliphatic diisocyanate, and the polyisocyanate (B) is also preferably obtained from at least an aliphatic diisocyanate.

  The polyisocyanate having an isocyanurate group can be produced by a known method. Specifically, it can be produced by multiplying an aliphatic diisocyanate and an alicyclic diisocyanate with an isocyanuration reaction catalyst. .

  As the isocyanurate-forming reaction catalyst, those having basicity are preferable. Specifically, tetraalkylammonium such as tetramethylammonium, monoethyltrimethylammonium, diethyldimethylammonium, tetraethylammonium, tetrabutylammonium and the like, and a hydroxide are used. Organic weak acid salts of tetraalkylammonium, acetic acid, capric acid, etc .; hydroxyalkylammonium such as trimethylhydroxypropylammonium, trimethylhydroxyethylammonium, triethylhydroxypropylammonium, triethylhydroxyethylammonium, hydroxide, acetic acid, capric acid Hydroxyacid ammonium weak acid salt; acetic acid, caproic acid, octylic acid, myristic acid, etc. Metal salts of alkyl carboxylic acids with carboxylic acids and tin, zinc, lead, sodium, potassium, etc .; metal alcoholates such as sodium and potassium; aminosilyl group-containing compounds such as hexamethyldisilazane; Mannich bases; A combined use of a secondary amine and an epoxy compound is exemplified. Among these, from the viewpoint of catalytic efficiency, a weak acid salt of tetraalkylammonium, a weak acid salt of hydroxyalkylammonium, and a metal salt of alkylcarboxylic acid are preferable, and a weak acid salt of tetraalkylammonium is more preferable.

  The addition amount of the isocyanurate reaction catalyst is preferably 10 ppm or more and 1000 ppm or less, more preferably 10 ppm or more and 500 ppm or less, and further preferably 10 ppm or more and 100 ppm or less with respect to the total amount of diisocyanate charged. . It exists in the tendency which is excellent in the simplicity of a manufacturing process because the addition amount is 1000 ppm or less. Moreover, it exists in the tendency which is excellent in reaction efficiency because the addition amount is 10 ppm or more.

  The reaction temperature of the isocyanuration reaction is preferably 50 ° C. or higher and 120 ° C. or lower, and preferably 60 ° C. or higher and 90 ° C. or lower. When the reaction temperature is in such a range, the product tends to be difficult to be colored.

  The isocyanuration reaction can be stopped by adding a reaction terminator as necessary when the conversion rate (mass ratio of polyisocyanate produced by the isocyanuration reaction to the charged diisocyanate) reaches a desired value. preferable. The conversion rate of the isocyanurate reaction is preferably 25% or less, more preferably 20% or less, from the viewpoint of low viscosity and curability when used as a coating composition. In order to obtain a copolymerized polyisocyanate having an isocyanurate group more efficiently, it is preferable to stop the progress of the reaction at the initial stage. In particular, since cyclic trimerization of isocyanate groups has a very high initial reaction rate, it is preferable to appropriately select the reaction conditions, and it is possible to appropriately select the addition amount and addition method of the catalyst among the reaction conditions. More preferred. As a method for adding the catalyst, a method in which the catalyst is added in portions at regular intervals is preferable.

  As the reaction terminator, phosphoric acid, pyrophosphoric acid, metaphosphoric acid, polyphosphoric acid and other phosphoric acid compounds; phosphoric acid, pyrophosphoric acid, metaphosphoric acid, polyphosphoric acid monoalkyl or dialkyl esters; monochloroacetic acid and other halogenated compounds Acetic acid; benzoyl chloride, sulfonic acid ester, and sulfuric acid. By using a reaction terminator, the storage stability of the resulting polyisocyanate tends to be further improved.

  The polyisocyanate having an allophanate group can be produced by a known method. Specifically, the polyisocyanate is produced by mixing an aliphatic diisocyanate or alicyclic diisocyanate with an alcohol, and allophanating with an allophanate reaction catalyst. be able to. In addition, it is also possible to use the same reaction terminator similarly to the manufacturing method of polyisocyanate which has said isocyanurate group.

  Examples of the allophanatization reaction catalyst include alkyl carboxylates such as tin, lead, zinc, bismuth, zirconium and zirconyl. Specifically, organic tin compounds such as tin 2-ethylhexanoate and dibutyltin dilaurate; organic lead compounds such as lead 2-ethylhexanoate; organic zinc compounds such as zinc 2-ethylhexanoate; 2-ethylhexanoic acid Bismuth, zirconium 2-ethylhexanoate, zirconyl 2-ethylhexanoate can be mentioned. The allophanatization reaction catalyst may be used alone or in combination of two or more.

  The ratio of the number of functional groups of the aliphatic diisocyanate and that of the alicyclic diisocyanate to the number of functional groups of the hydroxyl group of the alcohol is preferably 10/1 or more and 1000/1 or less, and more preferably 100/1 or more and 1000/1 or less. When the ratio is 10/1 or more, the average number of functional groups of the isocyanate group of the polyisocyanate tends to increase. Moreover, it exists in the tendency for a viscosity to fall because an equivalent ratio is 1000/1 or less.

  An isocyanuration reaction catalyst can be used as an allophanatization reaction catalyst. When an allophanate reaction is performed using an isocyanurate reaction catalyst, an isocyanurate group is also generated. Therefore, using the above isocyanurate reaction catalyst as an allophanate reaction catalyst can perform both an allophanate reaction and an isocyanurate reaction, and thus tends to be excellent in economical production.

  The polyisocyanate (A) and the polyisocyanate (B) are each independently a polyisocyanate having a biuret group based on the total amount (100% by mass) of the polyisocyanate (A) or the polyisocyanate (B). The content is preferably 1.0% by mass or less, more preferably 0.5% by mass or less, and still more preferably substantially not. When the polyisocyanate having a biuret group is contained in an amount of 1.0% by mass or less, an increase in diisocyanate after storage of the block polyisocyanate composition tends to be prevented.

  The polyisocyanate (A) and the polyisocyanate (B) each independently increased the diisocyanate concentration when the polyisocyanate (A) or the polyisocyanate (B) was stored at 40 ° C. for 1 month to a value of 0.001. It is preferably 6% by mass or less, more preferably 0.5% by mass or less, and further preferably 0.4% by mass or less.

[Mixing process]
In the mixing step of this embodiment, the polyisocyanate (A) and the polyisocyanate (B) obtained by the above method are mixed to obtain a polyisocyanate mixture.

In the mixing step, it is preferable to satisfy the following relational expression (1).
10/90 ≦ polyisocyanate (A) / polyisocyanate (B) ≦ 90/10 (1)
In formula (1), polyisocyanate (A) and polyisocyanate (B) represent the mass of each. )

  As described above, the ratio of the mass of the polyisocyanate (A) to the mass of the polyisocyanate (B) is preferably 10/90 or more and 90/10 or less, and more preferably 15/85 or more and 85/15 or less. Preferably, it is 20/80 or more and 80/20 or less, more preferably 40/60 or more and 60/40 or less, and most preferably 50/50. The ratio is 90/10 or less and the curability tends to be excellent when used as a coating composition. Moreover, it exists in the tendency which is excellent in the water dispersibility of a block polyisocyanate composition because a ratio is 10/90 or more.

[First reaction step]
In the first reaction step of this embodiment, the polyisocyanate mixture produced in the mixing step and poly (oxyalkylene) glycol monoalkyl ether are reacted to obtain a polyisocyanate composition. As the poly (oxyalkylene) glycol monoalkyl ether, the above-described poly (oxyalkylene) glycol monoalkyl ether can be used.

  In the first reaction step, organometallic salts such as tin, zinc and lead, tertiary amine compounds, and alkali metal alcoholates such as sodium may be used as catalysts.

  The reaction temperature in the first reaction step is preferably −20 ° C. or higher and 150 ° C. or lower, and more preferably 30 ° C. or higher and 100 ° C. or lower. When the reaction temperature is −20 ° C. or higher, the reactivity tends to be increased. Moreover, it exists in the tendency which can suppress a side reaction because reaction temperature is 150 degrees C or less.

  It is preferable to completely react with the polyisocyanate composition so that the poly (oxyalkylene) glycol monoalkyl ether does not remain in an unreacted state. By not remaining in an unreacted state, there may be a tendency to suppress water dispersion stability of the block polyisocyanate composition and curability deterioration when used as a coating composition.

  In the first reaction step, the poly (oxyalkylene) glycol monoalkyl ether is preferably 15% by mass or more and 40% by mass or less based on the solid content (100% by mass) of the block polyisocyanate composition. More preferably, the content is from 35% by mass to 35% by mass, and further preferably from 20% by mass to 30% by mass. When the poly (oxyalkylene) glycol monoalkyl ether is 15% by mass or more, the compoundability tends to be excellent. Moreover, it exists in the tendency which is excellent in water resistance when it uses as a coating composition because poly (oxyalkylene) glycol monoalkyl ether is 40 mass% or less.

  In the first reaction step, the number average molecular weight of the poly (oxyalkylene) glycol monoalkyl ether to be used is preferably 200 or more and 2000 or less.

[Second reaction step]
In the second reaction step of this embodiment, the polyisocyanate composition obtained in the first reaction step is reacted with a blocking agent to obtain a block polyisocyanate composition. Specifically, the isocyanate group of the polyisocyanate composition remaining without reacting in the first reaction step is reacted with the active hydrogen group of the blocking agent. As the blocking agent, the blocking agent described above can be used.

  The reaction temperature of the second reaction step, the reaction conditions such as the catalyst, etc. can be performed in the same manner as the reaction of the first reaction step. When an isocyanate group remains after the reaction, it is preferable to further add a blocking agent or the like to completely disappear the isocyanate group.

  In the second reaction step, the blocking agent to be used preferably contains at least one selected from the group consisting of oxime compounds, pyrazole compounds, active methylene compounds, amine compounds, and caprolactam compounds.

  By the mixing step, the first reaction step, and the second reaction step, the block polyisocyanate composition is converted into an isocyanurate group, allophanate group, biuret group, urethane group, uretdione group, iminooxax, which the block polyisocyanate composition has. It is preferable to mix and react such that the content of the isocyanurate group is 5 mol% or more and 80 mol% or less with respect to the total (100 mol%) of the diazinedione group and the urea group.

  In the mixing step, the first reaction step, and the second reaction step, the block polyisocyanate composition is 25% by mass of the isocyanurate trimer with respect to the total amount (100% by mass) of the block polyisocyanate composition. It is preferable to mix and react so as to include 50% by mass or less.

  By the mixing step, the first reaction step, and the second reaction step, the block polyisocyanate composition has the number of allophanate groups that the block polyisocyanate composition has relative to the number of functional groups of the isocyanurate groups that the block polyisocyanate composition has. It is preferable to mix and react so that the molar ratio is 10/90 or more and 90/10 or less.

(Water dispersion)
The aqueous dispersion of this embodiment contains the blocked isocyanate composition obtained as described above and water. The aqueous dispersion is obtained, for example, by adding water to the blocked isocyanate composition. It is preferable to add water to the blocked isocyanate composition by dividing or dropping a predetermined amount thereof. In the case of dividing, it is preferable that the addition amount is 4 or more and 8 or less. The water dispersion is 50 ° C. or more and less than 80 ° C. when the block polyisocyanate is 55% by mass or more and 45% or more and less than 55% by mass with respect to water (100% by mass). If it is less than mass%, it is preferable to hold | maintain the liquid temperature of 20 to 50 degreeC. By dividing or dripping a predetermined amount of water and maintaining the liquid temperature in such a range, the average particle size (average dispersed particle size) of the water dispersion becomes too large, and precipitation and separation occur. The stability of the aqueous dispersion tends to suppress the decrease.

  The aqueous dispersion preferably contains 10% by mass or more and 40% by mass or less of the block polyisocyanate with respect to the total amount (100% by mass) of the aqueous dispersion.

[Coating composition]
The coating composition of this embodiment includes the above-described aqueous dispersion and at least one selected from the group consisting of polyols, polyamines, and alkanolamines. Moreover, a coating composition is obtained by mix | blending an aqueous dispersion and at least 1 sort (s) chosen from the group which consists of a polyol, a polyamine, and an alkanolamine.

  In the coating composition, the blocked polyisocyanate is a main component of the coating composition together with at least one selected from the group consisting of polyols, polyamines, and alkanolamines.

  The coating composition preferably contains at least a polyol. Examples of the polyol include polyester polyol, acrylic polyol, polyether polyol, polyolefin polyol, fluorine polyol, polycarbonate polyol, and polyurethane polyol.

  As the polyester polyol, specifically, at least one dibasic acid selected from the group consisting of succinic acid, adipic acid, sebacic acid, dimer acid, maleic anhydride, phthalic anhydride, isophthalic acid, terephthalic acid, and ethylene Polyester polyol obtained by a condensation reaction with at least one polyhydric alcohol selected from the group consisting of glycol, propylene glycol, diethylene glycol, neopentyl glycol, trimethylolpropane and glycerin, and ε- using polyhydric alcohol Examples thereof include polycaprolactones obtained by ring-opening polymerization of caprolactone.

  Examples of the acrylic polyol include a copolymer of an ethylenically unsaturated bond monomer having a hydroxyl group and another ethylenically unsaturated bond-containing monomer copolymerizable therewith. Examples of the ethylenically unsaturated bond-containing monomer having a hydroxyl group include hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, and hydroxybutyl methacrylate. Of these, hydroxyethyl acrylate and hydroxyethyl methacrylate are preferred. Other ethylenically unsaturated bond-containing monomers copolymerizable with the ethylenically unsaturated bond monomer having a hydroxyl group include methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, acrylic acid- acrylic acid esters such as n-butyl, isobutyl acrylate, acrylic acid-n-hexyl, cyclohexyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, benzyl acrylate, phenyl acrylate; methyl methacrylate, ethyl methacrylate , Propyl methacrylate, isopropyl methacrylate, -n-butyl methacrylate, isobutyl methacrylate, methacrylic acid -n-hexyl, cyclohexyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, benzyl methacrylate Methacrylic acid esters such as phenyl methacrylate; unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, and itaconic acid; acrylamide, methacrylamide, N, N-methylenebisacrylamide, diacetone acrylamide, diacetone methacrylamide, Unsaturated amides such as maleic acid amide and maleimide; vinyl monomers such as glycidyl methacrylate, styrene, vinyl toluene, vinyl acetate, acrylonitrile and dibutyl fumarate; vinyltrimethoxysilane, vinylmethyldimethoxysilane, γ- (meta And vinyl monomers having a hydrolyzable silyl group such as acryloxypropyltrimethoxysilane.

  As the polyether polyol, a polybasic hydroxy compound, a hydroxide such as lithium, sodium and potassium, a strong basic catalyst such as alcoholate and alkylamine, ethylene oxide, propylene oxide, butylene oxide, cyclohexene oxide, Polyether polyols obtained by adding alkylene oxides such as styrene oxide; polyether polyols obtained by reacting alkylene oxide with polyfunctional compounds such as ethylene diamines; and polymerizing acrylamide and the like using these polyether polyols as a medium And so-called polymer polyols obtained in this manner.

  Examples of the polyvalent hydroxy compound include diglycerin, ditrimethylolpropane, pentaerythritol, dipentaerythritol; erythritol, D-threitol, L-arabinitol, ribitol, xylitol, sorbitol, mannitol, galactitol, rhamnitol and the like. Compounds; monosaccharides such as arabinose, ribose, xylose, glucose, mannose, galactose, fructose, sorbose, rhamnose, fucose, ribodeose; disaccharides such as trehalose, sucrose, maltose, cellobiose, gentiobiose, lactose, melibiose; raffinose, gentianose And trisaccharides such as meletitose; tetrasaccharides such as stachyose.

  Examples of the polyolefin polyol include polybutadiene having two or more hydroxyl groups, hydrogenated polybutadiene, polyisoprene, and hydrogenated polyisoprene. The number of hydroxyl groups (hereinafter referred to as “average number of hydroxyl groups”) possessed by one statistical molecule of polyol is preferably 2 or more. When the average number of hydroxyl groups of the polyol is 2 or more, there is a tendency that a decrease in the crosslinking density of the obtained coating film can be suppressed.

  The fluorine polyol is a polyol containing fluorine in the molecule. For example, fluoroolefin, cyclovinyl ether, hydroxyalkyl vinyl ether, vinyl monocarboxylate disclosed in JP-A-57-34107 and JP-A-61-275111. There are copolymers such as esters.

  As the polycarbonate polyol, a polyalkyl alcohol used in the above-mentioned polyester polyol is polycondensated with a low molecular carbonate compound such as dialkyl carbonate such as dimethyl carbonate, alkylene carbonate such as ethylene carbonate, diaryl carbonate such as diphenyl carbonate, and the like. What is obtained is mentioned.

  The polyurethane polyol can be obtained by reacting a polyol and a polyisocyanate by a conventional method. Examples of the polyol include those having no carboxyl group, and low molecular weight polyols such as ethylene glycol and propylene glycol, and high molecular weight polyols such as acrylic polyol, polyester polyol, and polyether polyol.

  Among the polyols described above, acrylic polyol and polyester polyol are preferable.

  In the coating composition in the case of using a polyol, the ratio of the number of functional groups of the blocked isocyanate group to the number of functional groups of the hydroxyl group of the polyol is preferably from 1/10 to 10/1.

  The hydroxyl value per resin of the polyol is preferably 10 mgKOH / resin g or more and 300 mgKOH / resin g or less. When the hydroxyl value per resin is 10 mgKOH / resin g or more, the crosslinking density is prevented from decreasing, and the target physical properties of this embodiment tend to be sufficiently achieved. On the other hand, when the hydroxyl value per resin is 300 mgKOH / resin g or less, the crosslinking density is prevented from excessively increasing, and the mechanical properties of the coating film tend to be maintained at a high level.

  The acid value per resin of the polyol is preferably 5 mgKOH / resin g to 150 mgKOH / resin g, more preferably 8 mgKOH / resin g to 120 mgKOH / resin g, more preferably 10 mgKOH / resin g to 100 mgKOH / resin. More preferably, it is g or less. When the acid value is 5 mg KOH / resin g or more, the water dispersibility tends to be kept high, and when it is 150 mg KOH / resin g or less, the water resistance of the coating film can be prevented from being lowered. It is in.

  When the block polyisocyanate composition and the polyol are used in the coating composition, the blending method of the block polyisocyanate composition and the polyol may be performed by mixing and dispersing the block polyisocyanate composition in the polyol as it is, The isocyanate composition may be mixed with water and then mixed with the polyol.

  Examples of the polyamine of the present embodiment include those having two or more primary amino groups and / or secondary amino groups in one molecule, and among them, those having three or more in one molecule are preferable.

  Specific examples of the polyamine include diamines such as ethylenediamine, propylenediamine, butylenediamine, triethylenediamine, hexamethylenediamine, 4,4′-diaminodicyclohexylmethane, piperazine, 2-methylpiperazine, and isophoronediamine; bishexamethylenetriamine , Diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentamethylenehexamine, tetrapropylenepentamine and the like chain polyamines having three or more amino groups; 1,4,7,10,13,16-hexaazacyclo And cyclic polyamines such as octadecane, 1,4,7,10-tetraazacyclodecane, 1,4,8,12-tetraazacyclopentadecane, 1,4,8,11-tetraazacyclotetradecane and the like. It is.

  The alkanolamine of this embodiment means the compound which has an amino group and a hydroxyl group in 1 molecule. Specifically, monoethanolamine, diethanolamine, aminoethylethanolamine, N- (2-hydroxypropyl) ethylenediamine, mono-, di- (n- or iso-) propanolamine, ethylene glycol-bis-propylamine, neo Examples include pentanolamine and methylethanolamine.

  Depending on the purpose of improving the compoundability in the coating composition, a surfactant and a solvent that tends to be miscible with water may be used for the block polyisocyanate composition.

  Specific examples of surfactants include aliphatic soaps, rosin acid soaps, alkyl sulfonates, dialkylaryl sulfonates, alkylsulfosuccinates, polyoxyethylene alkyl sulfates, polyoxyethylene alkyl aryl sulfates, and the like. Nonionic surfactants such as anionic surfactants; polyoxyethylene alkyl ethers, polyoxyethylene alkyl aryl ethers, polyoxyethylene oxypropylene block copolymers, and the like.

  Solvents that tend to be miscible with water include diethylene glycol dimethyl ether, diethylene glycol diethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether, propylene glycol dimethyl ether, dipropylene glycol dimethyl ether, isobutanol, butyl glycol, and N-methylpyrrolidone. Butyl diglycol and butyl diglycol acetate. Among these solvents, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, propylene glycol monomethyl ether, propylene glycol dimethyl ether, dipropylene glycol dimethyl ether, isobutanol, butyl glycol, N-methylpyrrolidone, and butyl diglycol are preferable, diethylene glycol dimethyl ether, diethylene glycol diethyl ether More preferred are propylene glycol dimethyl ether and dipropylene glycol dimethyl ether. These solvents may be used alone or in combination of two or more.

  You may mix | blend a well-known melamine resin, an epoxy resin, and a polyurethane resin with a coating composition. Moreover, when the polyol mentioned above has a carboxyl group, you may mix | blend an oxazoline group containing compound and a carbodiimide group containing compound. Furthermore, when the polyol mentioned above has a carbonyl group, you may mix | blend a hydrazide group containing compound and a semicarbazide group containing compound. These compounds can be blended not only alone but also two or more compounds.

  Examples of the melamine resin include partially or completely methylolated melamine resin obtained by a reaction between melamine and an aldehyde. Examples of the aldehyde include formaldehyde and paraformaldehyde. Moreover, what methylated the methylol group of this methylol-ized melamine resin partially or completely etherified with alcohol can also be used. Examples of the alcohol used for etherification include methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, 2-ethylbutanol, and 2-ethylhexanol. Specific examples of the melamine resin include “Cymel 303”, “Cymel 323”, “Cymel 325”, “Cymel 327”, “Cymel 350”, “Cymel 370”, and “Cymel 380” manufactured by Nippon Cytec Industries, Ltd. ”,“ Cymel 385 ”,“ Cymel 212 ”,“ Cymel 251 ”,“ Cymel 254 ”, and“ My Coat 776 ”. When a melamine curing agent is used in combination, an acidic compound is effective as a catalyst for curing. Examples of the acidic compound include carboxylic acid, sulfonic acid, acidic phosphate ester, and phosphite ester.

  Examples of the carboxylic acid include acetic acid, lactic acid, succinic acid, oxalic acid, maleic acid, and decanedicarboxylic acid. Examples of the sulfonic acid include p-toluenesulfonic acid, dodecylbenzenesulfonic acid, and dinonylnaphthalenedisulfonic acid. Examples of acidic phosphate esters include dimethyl phosphate, diethyl phosphate, dibutyl phosphate, dioctyl phosphate, dilauryl phosphate, monomethyl phosphate, monoethyl phosphate, monobutyl phosphate, and monooctyl phosphate. Examples of the phosphite include diethyl phosphite, dibutyl phosphite, dioctyl phosphite, dilauryl phosphite, monoethyl phosphite, monobutyl phosphite, monooctyl phosphite and monolauryl phosphite.

  The epoxy resin is a resin having two or more epoxy groups per molecule. Specific examples of the epoxy resin include a bisphenol type epoxy resin obtained by adding epochorohydrin to bisphenol, a novolak type epoxy resin obtained by adding epichlorohydrin to a phenol novolac resin, and polyethylene glycol diglycidyl ether. . The epoxy resin can be used after being dispersed in water as required.

  The polyurethane resin is not limited as long as it is generally used in paints, but a polyurethane resin that is chain-extended by reacting an isocyanate group with a polyol is preferable. Examples of the polyurethane resin include those having a carboxyl group obtained by using a carboxyl group-containing polyol as a part of the polyol, and those having a hydroxyl group at the terminal. The polyurethane resin having a carboxyl group is preferably neutralized with a basic substance. As commercial products, trade names “Superflex Series 110”, “Superflex Series 150”, “Superflex Series 460S” manufactured by Daiichi Kogyo Seiyaku Co., Ltd., “Neolet's R9649”, “Neolet's R966” manufactured by Avisia. Is mentioned.

  Examples of the oxazoline group-containing compound include a polymer compound having at least two oxazoline groups in the side chain and a monomer compound having at least two oxazoline groups in one molecule.

  The carbodiimide group-containing compound can be obtained by decarbonizing the isocyanate groups of the polyisocyanate compound. Commercially available carbodiimide group-containing compounds include Nisshinbo's trade names “Carbodilite V-02”, “Carbodilite V-02-L2”, “Carbodilite V-04”, “Carbodilite E-01”, “Carbodilite E-”. 02 ".

The hydrazide group-containing compound is a compound having at least two hydrazide groups represented by —CO—NH—NH ₂ in one molecule, and preferably a compound having 2 or more and 10 or less. Specific examples of the hydrazide group-containing compound include saturated dicarboxylic acids having 2 to 18 carbon atoms such as oxalic acid dihydrazide, malonic acid dihydrazide, glutaric acid dihydrazide, succinic acid dihydrazide, adipic acid dihydrazide, sebacic acid dihydrazide and the like. Dihydrazide; monoolefinic unsaturated dicarboxylic acid dihydrazide such as maleic acid dihydrazide, fumaric acid dihydrazide, itaconic acid dihydrazide; a polyhydride obtained by reacting a low polymer having a carboxylic acid lower alkyl ester group with hydrazine or hydrazine hydrate And hydrazide.

The semicarbazide group-containing compound is a compound having at least two semicarbazide groups represented by —NH—CO—NH—NH ₂ in one molecule, and is preferably a compound having 2 or more and 10 or less. Specific examples of the semicarbazide group-containing compound include bissemicarbazide; diisocyanates such as hexamethylene diisocyanate and isophorone diisocyanate, and polyisocyanate compounds derived therefrom, N, N-substituted hydrazines such as N, N-dimethylhydrazine, and the above examples. The polyfunctional semicarbazide obtained by making hydrazine react is mentioned.

  Depending on the purpose and application other than those described above, the coating composition may be an organic solvent, a curing accelerating catalyst, an antioxidant, an ultraviolet absorber, a light stabilizer, a pigment, a leveling agent, a plasticizer, and a surfactant. Additives can be included.

  Examples of the organic solvent include the above-mentioned solvents that tend to be miscible with water; aliphatic hydrocarbon solvents such as hexane, heptane, and octane; alicyclic hydrocarbon solvents such as cyclohexane and methylcyclohexane; acetone, methyl ethyl ketone, Ketone solvents such as methyl isobutyl ketone and cyclohexanone; ester solvents such as methyl acetate, ethyl acetate, butyl acetate, isobutyl acetate, methyl lactate and ethyl lactate; toluene, xylene, diethylbenzene, mesitylene, anisole, benzyl alcohol, phenyl glycol, Aromatic solvents such as chlorobenzene; ethylene glycol monoethyl ether acetate, 3-methyl-3-methoxybutyl acetate, dipropylene glycol monomethyl ether, propylene glycol monomethyl ether, pro Glycol solvents such as lenglycol monomethyl ether acetate; ether solvents such as diethyl ether, tetrahydrofuran and dioxane; halogenated hydrocarbon solvents such as dichloromethane, 1,2-dichloroethane and chloroform; N-methyl-2-pyrrolidone and the like Pyrrolidone solvents; amide solvents such as N, N-dimethylacetamide and N, N-dimethylformamide; sulfoxide solvents such as dimethyl sulfoxide; lactone solvents such as γ-butyrolactone; amine solvents such as morpholine; A mixture is mentioned. In addition, you may use these organic solvents individually by 1 type or in combination of 2 or more types.

  Curing accelerating catalysts include dibutyltin dilaurate, dibutyltin diacetate, dioctyltin dilaurate, dimethyltin dineodecanoate, tin compounds such as bis (2-ethylhexanoic acid) tin; zinc 2-ethylhexanoate, zinc naphthenate Zinc compounds such as 2-ethylhexanoate titanium, titanium diisopropoxybis (ethylacetonate), etc .; cobalt compounds such as cobalt 2-ethylhexanoate and cobalt naphthenate; bismuth 2-ethylhexanoate, naphthene Bismuth compounds such as bismuth acid; zirconium compounds such as zirconium tetraacetylacetonate, zirconyl 2-ethylhexanoate, and zirconyl naphthenate; amine compounds.

  Examples of the antioxidant include hindered phenol compounds, phosphorus compounds, and sulfur compounds. Examples of the ultraviolet absorber include benzotriazole compounds, triazine compounds, and benzophenone compounds. Examples of the light stabilizer include hindered amine compounds, benzotriazole compounds, triazine compounds, benzophenone compounds, and benzoate compounds. Examples of the pigment include titanium oxide, carbon black, indigo, pearl mica, and aluminum. A silicone oil is mentioned as a leveling agent. Examples of the plasticizer include phthalic acid esters, phosphoric acid compounds, and polyester compounds. Examples of the surfactant include the above-described surfactants, known anionic surfactants, cationic surfactants, and amphoteric surfactants.

[Method for producing substrate with cured coating film]
The manufacturing method of the base material with a cured coating film of this embodiment has the hardening process which coats the coating composition mentioned above on a base material, and hardens it.

[Curing process]
Specifically, as the curing step of the present embodiment, the coating composition is applied to the substrate and cured by applying a temperature equal to or higher than the dissociation temperature of each known blocking agent, whereby the coating is cured on the substrate. A film is formed.

  Specific examples of base materials include various metals such as glass, aluminum, iron, galvanized steel, copper, and stainless steel; porous members such as wood, paper, mortar, and stone; fluorine coating, urethane coating, acrylic urethane coating Hardened materials such as silicones, modified silicones, urethanes, etc .; Rubbers such as vinyl chloride, natural rubber and synthetic rubbers; Leathers such as natural leather and artificial leather; Plants and animals Fibers such as carbon fiber and glass fiber; films and plates of resins such as nonwoven fabric, polyester, acrylic, polycarbonate, triacetyl cellulose, polyolefin; inks such as ultraviolet curable acrylic resin layer, printing ink, and UV ink Can be mentioned.

  The coating composition of the present embodiment includes a coating composition, a pressure-sensitive adhesive composition, an adhesive composition, a curable composition such as a casting composition, various surface treatment compositions such as a fiber treatment agent, and various types. It is used as a crosslinking agent such as an elastomer composition and a foam composition, as well as a modifier and an additive.

  When used as a coating composition, it is preferably used as a primer, intermediate coating, and top coating on various materials by roll coating, curtain flow coating, spray coating, electrostatic coating, bell coating, and the like. Moreover, this coating composition is preferably used for pre-coating metal including rust-proof steel plate, automobile coating, plastic coating; imparting cosmetic properties, weather resistance, acid resistance, rust resistance, chipping resistance, adhesion and the like.

  The coating composition forms a coating film through a baking process after coating by roll coating, curtain flow coating, spray coating, electrostatic coating, bell coating, or the like. This coating composition preferably has a crosslinked coating film formed through a baking step. In addition to chemical resistance, heat resistance, water resistance, etc., the crosslinked coating film after curing of the coating composition enables hydrogen bonding between layers and is excellent in interlayer adhesion when performing layer coating or recoating. . Even in the coating film in which the crosslinked structure is not completely formed after the baking process, it is excellent in the same manner as the crosslinked coating film because of excellent adhesion at the time of lamination coating or recoating. When laminating several layers of coating liquid wet-on-wet like painting on a new car line of an automobile, the organic amine compound is present in the coating composition or in the crosslinked coating after curing, so the lower layer or upper layer It may also act as a catalyst for the crosslinking reaction.

  When used as a pressure-sensitive adhesive composition or an adhesive composition, it can be used as a coating solution diluted with various solvents, water, or the like from the viewpoint of workability when applied to an adherend and ease of thinning. Among these, water is preferably used as a dilution medium from the viewpoint of protecting the global environment. The amount of solvent used in the dilution medium is preferably 30% by mass or less, more preferably 20% by mass or less, further preferably 10% by mass or less, and the dilution medium is only water. Even more preferred. The solid content concentration of all binder resin components in the coating solution is preferably 1% by mass or more and 30% by mass or less, and more preferably 2% by mass or more and 20% by mass or less.

  Fields of use when used as a pressure-sensitive adhesive composition or an adhesive composition include automobiles, building materials, home appliances, woodworking, and laminates for solar cells. Among them, optical members for liquid crystal displays of home appliances such as televisions, personal computers, digital cameras, and mobile phones exhibit various functions. Therefore, it is necessary to laminate films and plates of various adherends. Since sufficient tackiness and / or adhesiveness is required between the film and the plate of various adherends, it is preferable as a usage example of the pressure-sensitive adhesive composition and the adhesive composition.

  Hereinafter, the present embodiment will be described in more detail with specific examples and comparative examples. However, the present embodiment is not limited to the following examples and comparative examples unless they exceed the gist thereof. Absent. Various physical properties and evaluations in Examples and Comparative Examples were measured and evaluated as follows.

(Physical property 1) Viscosity at 40 ° C. The viscosity of the polyisocyanate and the block polyisocyanate composition was measured using the following apparatus. In Table 1, “impossible to measure” means a value exceeding the upper limit that can be measured.
Equipment: Toki Sangyo RE-85U
Rotor: Cone plate 3 ° x R14
Measurement temperature: 40 ° C

(Physical property 2) Number average molecular weight For poly (oxyalkylene) glycol monoalkyl ether and polyisocyanate, the number average molecular weight was measured by gel permeation chromatography (GPC) using the following apparatus, and the number average molecular weight based on polystyrene. As measured.
Equipment: Tosoh Corporation HLC-802A
Column: Tosoh Corporation G1000HXL x 1
G2000HXL x 1
G3000HXL × 1 Carrier: Tetrahydrofuran Flow rate: 0.6 mL / min Sample concentration: 1.0% by mass
Injection volume: 20 μL
Temperature: 40 ° C
Detection method: Differential refractometer

(Physical property 3) Isocyanurate trimer concentration For polyisocyanate and block polyisocyanate composition, GPC measurement is performed in the same manner as the measurement of the number average molecular weight of physical property 2, and from the following formula (4), it is 3 times that of diisocyanate. The peak area% corresponding to the molecular weight was calculated as the isocyanurate trimer content (trimer concentration) in the polyisocyanate composition according to the following formula (4).
Content (mass%) of isocyanurate trimer = (peak area corresponding to molecular weight three times that of diisocyanate / total peak area) × 100 (4)

(Physical property 4) Content of isocyanurate group With respect to polyisocyanate and block polyisocyanate composition, isocyanurate group, allophanate group, biuret group, urethane group, uretdione group, iminooxadiazinedione in the polyisocyanate composition The content of isocyanurate groups (the ratio of isocyanurate groups) with respect to the total of 100 mol% of the groups and urea groups was determined using a carbon thirteen nuclear magnetic resonance spectrum ( ¹³ C) using a trade name “Biospin Avance 600” manufactured by Bruker. -NMR).

Specifically, the polyisocyanate composition was dissolved in deuterium chloroform at a concentration of 60% by mass to prepare an NMR measurement sample. The chemical shift standard was deuterochloroform signal of 77 ppm. The NMR measurement sample was measured by ¹³ C-NMR, the area of the carbonyl carbon signal was determined, and the content of the isocyanurate group was calculated by the following formula (5).
Isocyanurate group content = (area near 149.0 ppm / 3) / (area near 149.0 ppm / 3 area near 154.4 ppm + area near 156.4 ppm / 2 + area near 155.9 ppm + 157.8 ppm Area / area around +144.6 ppm + area around 158.2 ppm) (5)

(Physical property 5) Isocyanate group content rate The method of measuring isocyanate group content rate with respect to polyisocyanate is carried out according to the method described in JIS K7301-1995 (Test method for tolylene diisocyanate type prepolymer for thermosetting urethane elastomer). did. Below, the more specific measuring method of isocyanate group content rate is shown.

(1) 1 g of a sample was collected in a 200 mL Erlenmeyer flask, and 20 mL of toluene was added to the flask to dissolve the sample.
(2) Thereafter, 20 mL of a 2.0 N di-n-butylamine / toluene solution was added to the flask and allowed to stand for 15 minutes.
(3) 70 mL of 2-propanol was added to the flask and dissolved to obtain a solution.
(4) The solution obtained in (3) above was titrated with 1 mol / L hydrochloric acid to determine the sample titer.
(5) Even when the sample was not added, the measurement was performed in the same manner as in the above (1) to (3), and the blank titer was determined.
From the sample titration and blank titration determined above, the isocyanate group content was calculated by the following formula (6).
Isocyanate group content (mass%) = (blank titration-sample titration) × 42 / [sample mass (g) × 1,000] × 100%. ... (6)

(Physical property 6) Average number of functional groups of isocyanate group The average number of functional groups of the isocyanate group relative to the polyisocyanate is the number of isocyanate functional groups statistically possessed by one molecule of the polyisocyanate. And the isocyanate group content measured in property 5 were calculated by the following formula (7).
Average number of functional groups = number average molecular weight of polyisocyanate × isocyanate group content (mass%) / 100/42 (7)

(Physical property 7) Molar ratio of allophanate group and isocyanurate group For polyisocyanate and block polyisocyanate composition, the molar ratio of allophanate group to isocyanurate group (allophanate group / isocyanurate group) is a trade name of Bruker. using "FT-NMR DPX-400", it was determined by measuring the proton nuclear magnetic resonance spectra ⁽¹ H-NMR).

Specifically, the polyisocyanate composition was dissolved in deuterium chloroform at a concentration of 10% by mass (0.03% by mass tetramethylsilane was added to the polyisocyanate) to prepare an NMR measurement sample. As a chemical shift standard, the hydrogen signal of tetramethylsilane was set to 0 ppm. An NMR measurement sample was measured by ¹ H-NMR, and a signal of a hydrogen atom bonded to a nitrogen atom of an allophanate group in the vicinity of 8.5 ppm (1 mol of hydrogen atom per 1 mol of the allophanate group) and an isocyanate in the vicinity of 3.8 ppm. The area ratio of the signal of the hydrogen atom of the methylene group adjacent to the nitrogen atom of the isocyanurate ring of the nurate group (6 mol of hydrogen atom per mol of isocyanurate group) was determined, and the allophanate group / isocyanate was calculated by the following formula (8). The molar ratio of nurate groups was calculated.
Allophanate group / isocyanurate group = (signal area around 8.5 ppm) / (signal area around 3.8 ppm / 6) (8)

(Evaluation 1) Water dispersibility As a water dispersion, it prepared with water so that a block polyisocyanate composition might be 30 mass%, and the presence or absence of the precipitate was observed visually. The case where there was no precipitate was evaluated as ○, and the case where there was a precipitate was evaluated as ×.

(Evaluation 2) Storage Stability As an aqueous dispersion, prepared with water so that the block polyisocyanate composition is 30% by mass, stored at 40 ° C. for 1 week, and then visually checked for changes in appearance before and after storage (color, The presence or absence of a precipitate was observed. The case where there was no change was evaluated as ○, and the case where there was a change was evaluated as ×.

(Evaluation 3) Smoothness The coating composition was applied to the electrodeposition plate so as to have a dry film thickness of 50 μm. After preliminary drying for 30 minutes in an atmosphere of 23 ° C. and 50% RH, drying was performed at 160 ° C. for 30 minutes to obtain a coating film. The appearance (sharpness and surface smoothness) of the coating film was measured using a digital oscilloscope “Wave Scan DOI” (trade name, manufactured by BYK Gardner) along the long side direction of the ABS plate. “Wave Scan DOI” has a configuration in which a laser point light source emits a laser beam at an angle of 60 ° with respect to a normal to the film surface, and a detector receives reflected light of the same angle opposite to the normal. . In this apparatus, the laser point light source was moved over the film surface and scanned, and the brightness of the reflected light was measured point by point at a predetermined interval to detect the optical profile of the film surface. The detected optical profile was spectrally analyzed through a frequency filter to analyze the surface structure. In that, the value of the Wc area (wavelength 1.0mm-3.0mm) of a coating film was used and evaluated. The measured value was an arithmetic average value of three measured values. Wc is an index of the smoothness of the coating film, and it was judged that the smaller the value, the better the smoothness. The measured values were evaluated as ○ when the measured value was less than 1.0 and × when 1.0 or more.

(Evaluation 4) Heat resistance Solvent-based two-component urethane paint (polyol: acrylic polyol-based urethane, manufactured by Nippon Paint Co., Ltd., trade name “Mighty rack (white)”) is sprayed on an aluminum plate to a thickness of 50 μm. Painted. Then, after leaving still at 23 degreeC and 50% humidity atmosphere for 2 weeks, the surface coated with the sandpaper of No. 1000 was grind | polished and the white board was produced.

  The coating composition was applied on the produced white plate so as to have a resin film thickness of 40 μm. The applicator was applied, set for 15 minutes at room temperature, and baked at 160 ° C. for 30 minutes. Thereafter, it was further baked at 180 ° C. for 30 minutes to obtain a baked coating film. The yellow index (YI) was measured based on ASTM D1925 using the chromaticity system “SM-T45” (manufactured by Suga Test Instruments Co., Ltd.). The case where YI of the baked coating film was smaller than 3 was evaluated as ○, and the case where it was 3 or more was evaluated as ×.

(Evaluation 5) Water resistance The coating composition was coated on a polypropylene plate so that the resin film thickness was 50 μm, set at room temperature for 15 minutes, and then baked at 160 ° C. for 30 minutes to form a cured coating film. Obtained. The appearance change when this cured coating film was immersed in water at 80 ° C. for 24 hours was visually observed before and after the immersion, and the case where there was no whitening was evaluated as “◯” and the case where there was whitening was evaluated as “X”.

(Production Example 1) Polyisocyanate A-1
A four-necked flask equipped with a stirrer, thermometer, reflux condenser, nitrogen blowing tube and dropping funnel was placed in a nitrogen atmosphere and 1000 g of hexamethylene diisocyanate (hereinafter also referred to as “HDI”), trifunctional polyol (hydroxyl group average) 3) Polycaprolactone-based polyester triol (trade name “Placcel 303” manufactured by Daicel Corporation, molecular weight 300, hereinafter also referred to as “PCL303”) 100 g and 2-ethylhexanol (hereinafter also referred to as “2EHOH”) 30 g was charged, and the temperature in the reactor (urethanization temperature) was set to 90 ° C. and kept for 1 hour under stirring. Thereafter, the temperature in the reactor (nulation temperature) is maintained at 80 ° C., tetramethylammonium capriate as an isocyanurate reaction catalyst is added, and phosphoric acid is added when the yield reaches 50%. The reaction was stopped. After filtering the obtained reaction liquid, unreacted HDI was removed using a thin film evaporator to obtain polyisocyanate A-1. Various physical properties of the resulting polyisocyanate are shown in Table 1.

(Production Examples 2-3) Polyisocyanate A-2, Polyisocyanate A-3
A polyisocyanate A-2 and polyisocyanate A-3 were obtained in the same manner as in Production Example 1 except that the 4-necked flask in the same apparatus as in Production Example 1 was placed in a nitrogen atmosphere and the raw materials were changed as shown in Table 1. It was. Various physical properties of the resulting polyisocyanate are shown in Table 1.

(Production Example 4) Polyisocyanate A-4
In the same apparatus as in Production Example 1, 1000 parts of HDI and 111 parts of 2-ethylhexanol were charged, and the mixture was kept at 90 ° C. for 2 hours with stirring. After raising the temperature to 110 ° C., 0.22 part of a 20% mineral spirit solution of zirconyl 2-ethylhexanoate as an allophanatization reaction catalyst was added. After reacting for 4 hours, 0.11 part of phosphoric acid was added to stop the reaction. The reaction was cooled and filtered. Then, unreacted HDI was removed with a thin film distiller to obtain an aliphatic polyisocyanate composition A-4. Various physical properties of the resulting polyisocyanate are shown in Table 1.

[Block polyisocyanate composition and aqueous dispersion thereof]
Example 1
In the same apparatus as in Production Example 1, 90 g of polyisocyanate A-1 and 10 g of polyisocyanate A-3, polyethylene glycol monomethyl ether which is a nonionic hydrophilic group compound (trade name “MPG-081” manufactured by Nippon Emulsifier Co., Ltd.) , Number average molecular weight 690, dispersity 1.1, 41.6 g of “poly (oxyalkylene) glycol monoalkyl ether B-1” in the table), urethane-forming catalyst (trade name, manufactured by Nitto Kasei Kogyo Co., Ltd.) “Neostan U-810”) 0.01 g was charged and held at 80 ° C. for 2 hours, after which 32.5 g of methyl ethyl ketoxime as blocking agent C-1 was added and infrared spectrum (trade name, manufactured by JASCO Corporation) "FT / IR-4000") confirms that the characteristic absorption of isocyanate groups has been eliminated, and block polyisocyanate Thereafter, 406.2 parts of water was added to the produced block polyisocyanate composition, and the mixture was stirred and mixed for 30 minutes to obtain an aqueous dispersion.Various physical properties of the obtained block polyisocyanate composition Table 2 shows the evaluation results.

(Examples 2-5, Comparative Examples 1-4)
Various block polyisocyanate compositions and aqueous dispersions thereof were obtained in the same manner as in Example 1 except that the raw materials were changed as shown in Table 2. Table 2 shows various physical properties and evaluation results of the obtained block polyisocyanate composition. Polyisocyanate A-5 in the table is a trade name “Vestanat T1890 / 100” manufactured by Degussa (polyisocyanate mainly containing a trimer of isophorone diisocyanate, NCO content = 17.2%), poly ( “Oxyalkylene” glycol monoalkyl ether B-2 is a trade name “Uniox M1000” (number average molecular weight 1000) manufactured by Nippon Oil & Fats Co., Ltd., and the blocking agent C-2 is 3,5-dimethylpyrazole.

[Coating composition and coating film]
(Example 6)
100 g of SETAQUA6510 (trade name manufactured by Nuplex Resin, acrylic polyol, solid content 42%, hydroxyl group 4.2% by mass) and 144.5 g of the aqueous dispersion produced in Example 1 were mixed to form a coating having a solid content concentration of 35% by mass. A composition was obtained. Using this coating composition, coating film formation and characteristic evaluation were performed by the methods of Evaluations 3 to 5, respectively. Table 3 shows the results of various evaluations.

(Examples 7-12, Comparative Examples 5-8)
The same operation as in Example 6 was carried out except that the aqueous dispersion described in Table 3 was used. Table 3 shows the results of various evaluations.

  The block polyisocyanate composition according to the present invention and the coating composition containing the same can be suitably used in the fields of paints and fiber treatment agents for various surfaces.

Claims (17)

Obtained by reacting a polyisocyanate mixture comprising a first polyisocyanate and a second polyisocyanate, a poly (oxyalkylene) glycol monoalkyl ether, and a blocking agent;
The first polyisocyanate is obtained from at least one selected from the group consisting of aliphatic diisocyanates and alicyclic diisocyanates, and the average number of functional groups of isocyanate groups of the first polyisocyanate is 4.0 or more and 10 And
The second polyisocyanate is obtained from at least one selected from the group consisting of aliphatic diisocyanates and alicyclic diisocyanates, and the average number of functional groups of isocyanate groups of the second polyisocyanate is 2.5 or more and 3 .9 or less,
The viscosity at 40 ° C. is 20,000 mPa · s or more and 200,000 mPa · s or less,
The said block polyisocyanate composition is a block polyisocyanate composition containing 25 mass% or more and 50 mass% or less of isocyanurate trimers with respect to the total amount (100 mass%) of this block polyisocyanate composition. The first polyisocyanate is obtained from at least an aliphatic diisocyanate,
The block polyisocyanate composition according to claim 1, wherein the second polyisocyanate is obtained from at least an aliphatic diisocyanate.   The block polyisocyanate composition has a total (100 mol%) of the isocyanurate group, allophanate group, biuret group, urethane group, uretdione group, iminooxadiazinedione group, and urea group of the block polyisocyanate composition. On the other hand, the block polyisocyanate composition according to claim 1 or 2, wherein the content of the isocyanurate group is 5 mol% or more and 80 mol% or less.   The block polyisocyanate composition has a molar ratio of an allophanate group of the block polyisocyanate composition to an isocyanurate group of the block polyisocyanate composition of 10/90 or more and 90/10 or less. 4. The block polyisocyanate composition according to any one of 3 above.   The block polyisocyanate composition according to any one of claims 1 to 4, wherein the poly (oxyalkylene) glycol monoalkyl ether has a number average molecular weight of 200 or more and 2000 or less.   The said blocking agent of Claim 1 containing at least 1 sort (s) chosen from the group which consists of an oxime type compound, a pyrazole type compound, an active methylene type compound, an amine type compound, and a caprolactam type compound. Block polyisocyanate composition. Mixing a first polyisocyanate and a second polyisocyanate to obtain a polyisocyanate mixture;
Reacting the polyisocyanate mixture with a poly (oxyalkylene) glycol monoalkyl ether to obtain a polyisocyanate composition;
A second reaction step of reacting the polyisocyanate composition with a blocking agent to obtain a blocked polyisocyanate composition, wherein the first polyisocyanate is composed of an aliphatic diisocyanate and an alicyclic diisocyanate. It is obtained from at least one selected, and the average number of functional groups of the isocyanate group of the first polyisocyanate is 4.0 or more and 10 or less,
The second polyisocyanate is obtained from at least one selected from the group consisting of aliphatic diisocyanates and alicyclic diisocyanates, and the average number of functional groups of isocyanate groups of the second polyisocyanate is 2.5 or more and 3 .9 or less,
The block polyisocyanate composition has a viscosity at 40 ° C. of 20,000 mPa · s or more and 200,000 mPa · s or less,
The said block polyisocyanate composition is a manufacturing method of a block polyisocyanate composition containing 25 to 50 mass% of isocyanurate trimers with respect to the total amount (100 mass%) of this block polyisocyanate composition. The first polyisocyanate is obtained from at least an aliphatic diisocyanate,
The production method according to claim 7, wherein the second polyisocyanate is obtained from at least an aliphatic diisocyanate.   The block polyisocyanate composition has a total (100 mol%) of the isocyanurate group, allophanate group, biuret group, urethane group, uretdione group, iminooxadiazinedione group, and urea group of the block polyisocyanate composition. On the other hand, the production method according to claim 7 or 8, wherein the content of the isocyanurate group is 5 mol% or more and 80 mol% or less.   The block polyisocyanate composition has a molar ratio of an allophanate group of the block polyisocyanate composition to an isocyanurate group of the block polyisocyanate composition of 10/90 or more and 90/10 or less. 10. The production method according to any one of 9 above.   The production method according to any one of claims 7 to 10, wherein the poly (oxyalkylene) glycol monoalkyl ether has a number average molecular weight of 200 or more and 2000 or less.   12. The blocking agent according to claim 7, wherein the blocking agent comprises at least one selected from the group consisting of an oxime compound, a pyrazole compound, an active methylene compound, an amine compound, and a caprolactam compound. Production method. The manufacturing method of any one of Claims 7-12 which satisfy | fills the following relational expression (1) in the said mixing process.
10/90 ≦ first polyisocyanate / second polyisocyanate ≦ 90/10 (1)
(In Formula (1), 1st polyisocyanate and 2nd polyisocyanate represent each mass.)   In the first reaction step, the poly (oxyalkylene) glycol monoalkyl ether is 15% by mass or more and 40% by mass or less based on the solid content (100% by mass) of the block polyisocyanate composition. Item 14. The production method according to any one of Items 7 to 13.   The water dispersion containing the block polyisocyanate composition of any one of Claims 1-6, and water.   A coating composition comprising the aqueous dispersion according to claim 15 and at least one selected from the group consisting of a polyol, a polyamine, and an alkanolamine.   The manufacturing method of a base material with a cured coating film which has a hardening process which paints the coating composition of Claim 16 on a base material, and is hardened.