JP5400494B2 - Water-based one-component paint composition for automobile interior - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention is a water-based one-component coating composition for automobile interiors , which is excellent in suppressing abnormal sounds (smacking noise) caused by contact with the coating surface and scratch resistance, and can form a soft touch-sensitive coating film with one coat. Related to things.

As a method for enhancing the texture of vehicle interior materials, interior building materials, etc., for example, a method of flocking the surface of a base material such as an interior material or attaching a back skin is known.
However, these methods increase the cost, man-hours, etc., and cannot provide a soft and excellent touch feeling.

  Therefore, in order to form a coating film having a touch feeling such as moist feeling and smooth feeling, for example, Patent Document 1 further includes a main agent containing a hydrophilic polyurethane polyol and a curing agent containing a hydrophilic polyisocyanate. An aqueous two-component polyurethane coating composition containing a fine hollow body and a filler has been proposed.

JP 2004-155883 A

However, in the aqueous two-component polyurethane coating composition disclosed in Patent Document 1, a two-component mixer must be used, and the work time and cost are more than twice that of one-coat coating. is there.
Furthermore, abnormal noise (smearing sound) generated when the painted surface of the interior material and other members such as plastic rub against each other leads to complaints from end users, which is a big problem for automobile manufacturers. Although it is possible to take measures by sticking a pad to the rubbing part, there is a disadvantage that the number of work steps increases and the cost increases.

The present invention solves the above-mentioned problems of the conventional technology, and is excellent in suppressing abnormal noise (smacking sound) caused by contact with the surface of the coating film and excellent in resistance to scratches and has a soft touch feeling coating film over a wide range of materials. An object of the present invention is to provide a water-based one-component coating composition for automobile interiors that can be satisfactorily adhered and formed with a single coat and does not cause environmental problems.

In order to achieve the object, the present invention includes the following (1) to ( 4 ).
(1) A water-based one-component paint composition for automobile interior containing a polyurethane dispersion (a), a chlorinated polypropylene dispersion (b), an acrylic resin emulsion (c), a polyurethane resin bead (d) and a wax (e) The polyurethane resin beads (d) are made of polyurethane resin beads and polyurethane acrylic resin beads, the wax (e) is a higher fatty acid amide wax, and the polyurethane dispersion (a) is chlorinated. The polyurethane dispersion (a) is 10 to 30% by mass in terms of 100% by mass of the solid content with respect to the total solid content of the polypropylene dispersion (b) and the acrylic resin emulsion (c), and the chlorinated polypropylene dispersion (b ) Is 45 to 55% by mass, acrylic resin The polyurethane (c) is a proportion of 20 to 40% by mass, and the polyurethane is 100 parts by mass with respect to the total solid content of the polyurethane dispersion (a), the chlorinated polypropylene dispersion (b) and the acrylic resin emulsion (c). The water-based one-component coating composition for automobile interior, wherein the resin beads (d) are in a proportion of 60 to 120 parts by mass and the wax (e) is in a proportion of 1 to 20 parts by mass.
(2) The aqueous one-component coating composition for automobile interior according to (1), wherein the polyurethane dispersion (a) is a dispersion of polyurethane having a carbonate bond.
(3) The aqueous one-component coating composition for automobile interior according to (1) or (2), wherein the polyurethane dispersion (a) is a polyurethane dispersion having a Tg of −50 to 10 ° C.
(4) The automotive interior water system 1 according to any one of (1) to (3), wherein the chlorinated polypropylene dispersion (b) is a dispersion of chlorinated polypropylene having a chlorination degree of 10 to 30% by mass. Liquid paint composition.

For the first time according to the present invention, it is excellent in suppressing abnormal noise (smack sound) caused by contact of various materials such as ABS, polycarbonate (PC), polypropylene (PP), TPO, etc., and scratch resistance, and soft touch feeling. It is possible to provide a water-based one-component coating composition that can satisfactorily adhere to and form a coating film on a wide range of materials with one coat advantageous in terms of working time and cost, and that does not cause environmental problems. It has become possible. Therefore, the coating film formed by the present invention, Ru automotive interior applications der.

The present invention will be described in detail below.
The polyurethane dispersion (a) used in the present invention is obtained by forcibly stirring and dispersing polyurethane together with a surfactant in water. This polyurethane is obtained by reacting an organic polyisocyanate with an active hydrogen group-containing compound. In the present invention, as the polyurethane, a polyurethane having a carbonate bond and a polyurethane having a Tg of −50 to 10 ° C. are preferable.

Specific examples of the organic polyisocyanate include toluene diisocyanates such as 2,4-toluene diisocyanate and 2,6-toluene diisocyanate, 4,4′-diphenylmethane diisocyanate, 2,4′-diphenylmethane diisocyanate, 2,2 Diphenylmethane diisocyanates such as' -diphenylmethane diisocyanate, phenylene diisocyanates such as 1,2-phenylene diisocyanate, 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, 2,4,6-trimethylphenyl-1,3-diisocyanate 2,4,6-triisopropylphenyl-1,3-diisocyanate, 1,4-naphthalene diisocyanate, 1,5-naphthalene diisocyanate, etc. Socyanates, chlorophenylene-2,4-diisocyanate, 4,4'-diphenyl ether diisocyanate, 3,3'-dimethyldiphenylmethane-4,4'-diisocyanate, 3,3'-dimethoxydiphenyl-4,4'-diisocyanate, etc. Aromatic diisocyanate, 1,6-hexamethylene diisocyanate, 1,4-tetramethylene diisocyanate, 2,2,4-trimethyl-1,6-hexamethylene diisocyanate, 2,4,4-trimethyl-1,6-hexa Xylylene diisocyanate such as aliphatic diisocyanate such as methylene diisocyanate, decamethylene diisocyanate, lysine diisocyanate, o-xylylene diisocyanate, m-xylylene diisocyanate, p-xylylene diisocyanate Aromatic aliphatic diisocyanates such as sulfonates, 1,4-cyclohexyl diisocyanate, isophorone diisocyanate, hydrogenated toluene diisocyanate, hydrogenated xylylene diisocyanate, and alicyclic diisocyanates such as hydrogenated diphenylmethane diisocyanate. Furthermore, organic polyisocyanates such as polymethylene polyphenyl polyisocyanate and crude toluene diisocyanate can also be used. In addition, modified isocyanates containing one or more uretdione bonds, isocyanurate bonds, allophanate bonds, burette bonds, uretonimine bonds, carbodiimide bonds, urethane bonds, urea bonds and the like obtained by modifying these organic polyisocyanates can also be used.
Any of these may be used alone or in admixture of two or more.

Examples of the active hydrogen group-containing compound include known active hydrogen group-containing compounds such as low-molecular and high-molecular polyols, amino alcohols, and polyamines. Specifically, low molecular weight polyols such as ethylene glycol, propylene glycol, dipropylene glycol, neopentyl glycol, 1,4-butanediol, 1,6-hexanediol, glycerin, trimethylolpropane, pentaerythritol, Examples thereof include polymer polyols such as oxyalkylene polyols, polyester polyols, and polycarbonate polyols.
Any of these may be used alone or in admixture of two or more.

As the surfactant, any of a nonionic surfactant, a cationic surfactant, an anionic surfactant and an amphoteric surfactant can be used. Among these, polyglycerin alkyl ether nonionic surfactant, polyglycerin fatty acid ester nonionic surfactant, polyoxyethylene alkyl ether nonionic surfactant, polyoxyethylene fatty acid ester nonionic surfactant, Nonionic surfactants such as polyoxyalkylamino ether nonionic surfactants, polyethylene glycol fatty acid ester nonionic surfactants, and polyoxyethylene sorbitan fatty acid ester nonionic surfactants are preferred.
Any of these may be used alone or in admixture of two or more.
In the production of the polyurethane dispersion (a) in the present invention, the surfactant is preferably used in an amount of 0.01 to 15.0% by mass, more preferably 0.1 to 10.0% by mass, based on the polyurethane (solid content). .

  Specific products that can be used as the polyurethane dispersion (a) include Boniter HUX386, HUX483, HUX561 manufactured by Asahi Denka Co., Ltd., WPC-101, WNS-353 manufactured by Nippon Polyurethane Industry Co., Ltd., and the like.

As the chlorinated polypropylene dispersion (b) used in the present invention, chlorinated polypropylene is dispersed by forcibly stirring in water together with the same surfactant as in the production of the polyurethane dispersion (a). As this chlorinated polypropylene, a chlorinated polypropylene having a chlorination degree of 10 to 30% by mass is preferable. Further, the chlorinated polypropylene preferably has a chlorination degree of 15 to 24.5% by mass and a number average molecular weight of 30,000 to 90,000.
Specific examples of products that can be used as the chlorinated polypropylene dispersion (b) include Hardren EW7315 and EW7306 manufactured by Toyo Kasei Kogyo Co., Ltd. and Supercron S4163 and S4196 manufactured by Nippon Paper Industries Co., Ltd.
In the production of the chlorinated polypropylene dispersion (b) in the present invention, the surfactant is used in an amount of 0.01 to 15.0% by mass, further 0.1 to 10.0% by mass, based on the chlorinated polypropylene (solid content). It is preferable to do this.

  The acrylic resin emulsion (c) used in the present invention is obtained by forcibly stirring a hydrophilic acrylic resin in water and emulsifying it, or a partially dispersed emulsion. At this time, the same surfactant as in the production of the polyurethane dispersion (a) may be used.

Examples of the hydrophilic acrylic resin include acrylic acid and methacrylic acid, ethyl acrylate, n-butyl acrylate, iso-butyl acrylate, 2-ethylhexyl acrylate, ethyl methacrylate, and n methacrylate. Preferred examples include copolymers of acrylic acid and methacrylic acid esters such as -butyl, iso-butyl methacrylate and 2-ethylhexyl methacrylate.
These can be used alone or in admixture of two or more.

  Specific products that can be used as the acrylic resin emulsion (c) include Dianal AX2234, AX2414, AX2376 manufactured by Mitsubishi Rayon Co., and HX-602.

The polyurethane resin beads (d) used in the present invention are a mixture of polyurethane resin beads and polyurethane acrylic resin beads, and polyurethane resin beads having an average particle diameter of 5 to 15 μm are preferable. This polyurethane resin is obtained by reacting an organic polyisocyanate with an active hydrogen group-containing compound other than an acrylic polyol, and the polyurethane acrylic resin is obtained by reacting an organic polyisocyanate with an acrylic polyol. The organic polyisocyanate is preferably an aliphatic diisocyanate or an alicyclic diisocyanate in the production of the polyurethane dispersion (a), and the active hydrogen group-containing compound other than the acrylic polyol is preferably used in the production of the polyurethane dispersion (a). low molecular or polymer polyols, amino alcohols, etc. can be mentioned polyamines, as the polyol of the polymer, polyoxyalkylene polyols, polyester polyols, polycarbonate polyols Or the like can be mentioned Le. Specific products that can be used as a polyurethane-based resin beads (d), Gifu Seratsuku Mills Co., Ltd. BE-40, Ru and the like can be illustrated. Negami Chemical Industrial Co., Ltd. of Art Pearl C-800.

The wax (e) used in the present onset bright, a higher fatty acid amide waxes, as a specific product Ru and the like can be illustrated Himicron L-271 manufactured by Chukyo Yushi Co..

In this onset Ming aqueous one-pack coating composition, the solid content 100 wt% in terms of, the solid content total amount of the polyurethane dispersion (a) and chlorinated polypropylene dispersion (b) an acrylic resin emulsion (c) The polyurethane dispersion (a) is 10 to 30% by mass, the chlorinated polypropylene dispersion (b) is 45 to 55% by mass, and the acrylic resin emulsion (c) is 20 to 40% by mass . Further, the polyurethane-based resin beads (d) is a soft feeling from the scratch resistant point, solids per 100 polyurethane dispersion (a) and chlorinated polypropylene dispersion (b) an acrylic resin emulsion (c) It is used at a ratio of 60 to 120 parts by mass with respect to parts by mass . Also, the wax (e) the points ,, scratch resistant, the solid content total amount 100 parts by weight of the polyurethane dispersion (a) and chlorinated polypropylene dispersion (b) an acrylic resin emulsion (c) 1 to 20 parts by mass .

  The aqueous one-component coating composition of the present invention further includes a filler, extender pigment, color pigment, dye, wetting agent, dispersion stabilizer, viscosity modifier, ultraviolet absorber, antioxidant, light stabilizer, fluorescent whitening. Additives such as agents, leveling agents, antifoaming agents, film-forming aids, organic solvents, and texture agents (eg, silicone oil) can be blended.

  There are no limitations on the base material on which the aqueous one-component coating composition of the present invention is applied. Specifically, plastic materials (especially ABS, PC, PP and TPO), metals, inorganic materials, wood, and the like are included. Can be mentioned.

The aqueous one-component coating composition can be applied to the substrate by a known method such as a doctor blade, a reverse roll, a gravure roll, a spinner coat, an extruder, a spray coat, a dip coat, a flow coat, or a wire coat.
The coating amount is preferably 1 to 300 g / m ² , particularly 1 to 200 g / m ² in terms of solid content of 100% by mass.
After coating, the coating film can be cured by leaving at 40 to 100 ° C., further 50 to 80 ° C., for 10 to 60 minutes, and further for 20 to 40 minutes.
The thickness of the coating film thus formed is preferably 1 to 100 μm, particularly preferably 10 to 50 μm in a dry state.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is limited to these and is not interpreted.

Examples 1-5
(1) Preparation of paint composition As a polycarbonate-based polyurethane dispersion (a), Bonitater HUX561 (Tg-15 ° C, SP value 10.4, solid content 40% by mass) manufactured by Asahi Denka Co., Ltd. and chlorinated polypropylene dispersion (B) Super Nippon S4196 (20% by mass chlorination, Tg 70 ° C., SP value 8.4, solid content 30% by mass) manufactured by Nippon Paper Industries Co., Ltd. and HX manufactured by Mitsubishi Rayon Co., Ltd. as an acrylic resin emulsion (c) -602 (Tg 80 ° C., SP value 10.4, solid content 35% by mass) and Art Pearl C-800 (polyurethane resin beads, spherical, average particle size 5 to 5) manufactured by Negami Kogyo Co., Ltd. as polyurethane resin beads (d) 8 μm) and BE-40 (polyurethane acrylic resin beads, average particle size of 10 to 12 μm) manufactured by Gifu Ceramics Co., Ltd. Wax (e) as Chukyo Yushi Co. Himicron L-271 and (a higher fatty acid amide waxes), it was formulated in the composition ratio shown in Table 1. Next, water and additives (leveling agent 7.0 g, antifoaming agent 1.0 g) were further added and mixed so as to obtain a coating-appropriate viscosity, thereby preparing coating materials T-1 to T-5.
(2) Formation of coating film Each of coating materials T-1 to T-5 prepared in (1) above is applied to the surface of the substrate so that the dry film thickness of the coating film becomes 20 to 30 μm using a spray gun. It was painted and dried at 80 ° C. for 30 minutes to form a coating film.
The following performance test was done about the obtained dried coating film.
(3) Performance test a) Adhesion test After the surface of the obtained dried coating film was cut into 100 squares of 1 mm square grids, a cello tape (registered trademark) peel test was performed and evaluated according to the following criteria.
Evaluation criteria ○: No peeling.
Δ: Partial peeling occurred.
X: There is peeling.
b) Tactile sensation test The tactile sensation was determined by touching the surface of the obtained dried coating film.
Evaluation criteria ○: Feel soft.
Δ: Somewhat soft feeling.
X: Soft feeling is not felt.
c) Scratch resistance test Gakushin-type friction test in which a 60 ° gloss value of a coating film formed on a polypropylene material (before the scratch resistance test) and a frictional element with glass beads attached (area 20 × 20 mm) are adhered to each other. The 60 ° gloss value after the coating film formed on the polypropylene material was worn back by reciprocating 21.6 N × 50 times was measured, respectively, and the 60 ° gloss value of the coating film before the test and the coating film after the test were measured. The gloss increase rate was determined from the 60 ° gloss value and evaluated according to the following criteria.
Evaluation criteria ○: Gloss increase rate is within 160%.
X: Gloss increase rate exceeds 160%.
d) Abnormal noise generation test Generated by rubbing the surface of a coating film formed on a polypropylene material and ABS (area 50 × 50 mm) attached to a surface property measuring machine manufactured by Shinto Kagaku while applying a load of 2 kg. The sound was listened to by ear and evaluated according to the following criteria.
Evaluation criteria ○: No sound is observed.
X: Generation of sound is recognized.
The results of these performance tests are summarized in Table 2.

Comparative Example 1
In Example 1, paint H-1 was prepared in the same manner except that 50 g of Mitsubishi Rayon Co., Ltd. HX-602 was used without using Asahi Denka Co., Ltd. Bontiter HUX561, and a coating film was formed.
The main raw material composition of the paint is shown in Table 3, and the performance test results are shown in Table 4.

Comparative Example 2
In Example 1, paint H-2 was prepared in the same manner except that Hi-micron L-271 manufactured by Chukyo Yushi Co., Ltd. was not used, and a coating film was formed.
The main raw material composition of the paint is shown in Table 3, and the performance test results are shown in Table 4.

Claims (4)

A water-based one-component coating composition for automobile interiors comprising a polyurethane dispersion (a), a chlorinated polypropylene dispersion (b), an acrylic resin emulsion (c), a polyurethane resin bead (d) and a wax (e). And
The polyurethane resin beads (d) comprise polyurethane resin beads and polyurethane acrylic resin beads, the wax (e) is a higher fatty acid amide wax, and
10-30 mass% of polyurethane dispersion (a) in conversion of 100 mass% of solid content with respect to solid content total amount of polyurethane dispersion (a), chlorinated polypropylene dispersion (b), and acrylic resin emulsion (c). %, Chlorinated polypropylene dispersion (b) in a proportion of 45-55% by mass, acrylic resin emulsion (c) in a proportion of 20-40% by mass, polyurethane dispersion (a) and chlorinated polypropylene dispersion (b) The polyurethane resin beads (d) are in a proportion of 60 to 120 parts by mass and the wax (e) is in a proportion of 1 to 20 parts by mass with respect to 100 parts by mass of the total solid content of the acrylic resin emulsion (c). about,
A water-based one-component coating composition for automobile interiors. The aqueous one-component paint composition for automobile interior according to claim 1, wherein the polyurethane dispersion (a) is a polyurethane dispersion having a carbonate bond. The aqueous one-component coating composition for automobile interior according to claim 1 or 2, wherein the polyurethane dispersion (a) is a polyurethane dispersion having a Tg of -50 to 10 ° C. The water-based one-component paint for automobile interior according to any one of claims 1 to 3, wherein the chlorinated polypropylene dispersion (b) is a dispersion of chlorinated polypropylene having a chlorination degree of 10 to 30% by mass. Composition.