KR20190063737A - A Water-based adhesives for Automobile interior materials - Google Patents

Abstract

The present invention relates to an adhesive composition capable of increasing the adhesion between a thermoplastic polyolefin (TPO) base layer and a PU foam layer by using an ethylene vinyl acetate-based first thickener and a clay-based second thickener together with a polypropylene emulsion resin modified with dicarboxylic acid or an anhydride thereof and a water-dispersed polyurethane resin.

Description

[0001] The present invention relates to a water-based adhesive for automobile interior materials,

The present invention relates to an aqueous adhesive for automobile interior materials. More particularly, the present invention relates to an eco-friendly water-based adhesive used for bonding an olefinic thermoplastic elastomer (TPO) and a polyurethane (PU) foam to be used as an automobile interior material.

Instrument panel for automobiles is a type of decorative pads including a surface on which an instrument panel, an air bag, a glove box, etc. are installed in front of a driver's seat and a passenger seat. The surface material is powder slush molding Powder Slush Molding (PSM) process.

In the powder slush molding process, the powder for producing the skin material is placed in a powder supply box, the heated mold is fastened thereon, and the powder is rotated, whereby the powder in contact with the heated mold is melted and formed into a sheet- .

In addition to the above-mentioned instrument panel, on the surface of various parts used as an automobile interior material such as a floor console, a door trim, or an arm rest, a high-quality image is provided in the interior of a vehicle, Various skin materials, such as skin materials, are used to provide a more comfortable atmosphere to the passengers by imparting a soft touch to areas where the occupant's physical contact is expected.

As described above, the skin material to be applied to automobile interior parts can be classified into a sheet-like material for a vacuum molding method and a powder-phase material for a PSM method. In the case of the PSM method, the molding of the skin material is somewhat more complicated However, since it can provide a smoother feeling and a clearer embossing than a vacuum molding method, it is applied to a luxury vehicle having a medium-sized or larger size.

In the case of the sheet-like material used in the above vacuum molding method, it has been widely applied that an acrylonitrile-butadiene-styrene copolymer (aka, ABS resin) is blended with vinyl chloride resin (PVC) A thermoplastic polyolefin (TPO) material based on propylene has been applied as an easy and eco-friendly material, and the frequency is increasing.

In the case of the powder phase material used in the PSM method, polyvinyl chloride powder (PVC powder) based on polyvinyl chloride (PVC) and compounded with a plasticizer and various additives is mainstream, and in some cases, propylene A powdery material of a thermoplastic polyolefin (TPO) having elasticity as a base is being developed as a material for the PSM method.

However, in the case of the PVC powder phase material for the PSM method, it is very difficult to recycle the skin material by using the phthalate-based plasticizer based on PVC, and when disposing the skin product by incineration, (Cl) -based compound which is a factor of the environmental destruction is used, the use thereof is gradually regulated, and the physical properties thereof are lowered under a low temperature condition, so that the invisible PAB door which is the mainstream of the passenger- Door), which is a limitation of the realization.

On the other hand, in order to overcome the problems of the PVC material, in the case of the thermoplastic polyolefin (TPO) based on propylene, the surface scratching property is lower than that of the PVC powdered material, There is a problem that not only the productivity and working environment of the skin material are lowered but also secondary environmental pollution caused by the coating agent is caused.

In addition, since the thermoplastic polyolefin (TPO) itself has a non-polarity, there is a problem that the adhesive strength to a foamed foam layer such as a polyurethane foam is low.

Accordingly, the present invention aims to provide an adhesive composition capable of improving the adhesion between a thermoplastic polyolefin (TPO) base layer and a polyurethane foam layer.

It is another object of the present invention to provide an environmentally friendly adhesive composition for automobile interior materials in which volatile organic compounds (VOCs) and hazardous air pollutants (HAPs) hardly occur.

The present invention also provides a method for manufacturing an automobile interior material by bonding a thermoplastic polyolefin (TPO) base layer and a polyurethane foam layer using an environmentally friendly adhesive composition.

The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical subjects which are not mentioned can be clearly understood by those skilled in the art from the description of the present invention .

According to an aspect of the present invention,

A water-dispersible polyurethane resin, an ethylene vinyl acetate-based first thickener, a clay-based second thickener, a wetting agent and an aqueous solvent, which is modified with a dicarboxylic acid or an anhydride thereof, an aqueous adhesive composition for automobile interior materials do.

According to one embodiment, the composition comprises 50 to 85% by weight of a polypropylene emulsion resin modified with a dicarboxylic acid or an anhydride thereof based on the weight of the composition, 5 to 30% by weight of a water-dispersed polyurethane resin, 1 to 5% 0.1 to 0.5 wt% of a second thickener, 0.1 to 2 wt% of a wetting agent, and 5 to 40 wt% of an aqueous solvent.

According to one embodiment, the blending ratio of the polypropylene emulsion resin modified with dicarboxylic acid or its anhydride and the water-dispersed polyurethane resin may be 70:30 to 95: 5 by weight ratio.

According to one embodiment, the polypropylene emulsion resin modified with a dicarboxylic acid or an anhydride thereof may be one produced by grafting a hydrophilic polymer to a polypropylene resin modified with a dicarboxylic acid or an anhydride thereof.

According to one embodiment, the hydrophilic polymer is a polyether resin having an amino group and has a weight average molecular weight of 500 to 2,000, and 5 to 20 parts by weight of a hydrophilic polymer is added to 100 parts by weight of a polypropylene resin modified with a dicarboxylic acid or an anhydride thereof Graft reaction may be used.

According to one embodiment, the dicarboxylic acid is selected from the group consisting of maleic acid, phthalic acid, itaconic acid, citraconic acid, alkenylsuccinic acid, cis-1,2,3,6-tetrahydrophthalic acid and 4-methyl- -Tetrahydrophthalic acid. ≪ / RTI >

According to one embodiment, the second clayey thickener may be at least one selected from hectorite and bentonite. According to one embodiment, the aqueous solvent is selected from the group consisting of ethanol, n-propanol, isopropanol, n-butanol, 2-butanol, isobutanol, n- pentanol, isopentanol, Alcohols, alcohols, cyclohexanol and 4-methyl-1-pentanol.

According to one embodiment, the aqueous solvent may be mixed for 5 to 50% by weight of isopropanol and 50 to 95% by weight of ion exchange water.

According to one embodiment, the viscosity of the adhesive composition may be from 900 to 1,000 cps as measured by a Brookfield viscometer, and as measured by Cup # 3 of from 40 to 80 seconds.

The present invention also relates to a method for manufacturing a thermoplastic polyolefin (TPO) base material, comprising the steps of: applying an aqueous adhesive for automobile interior material as described above to a thermoplastic polyolefin (TPO) And

And joining the dried thermoplastic polyolefin (TPO) base layer and the polyurethane foam layer to each other.

The adhesive composition according to the present invention can be produced by using an ethylene vinyl acetate-based first thickener and a clay-based second thickener in combination with a dicarboxylic acid or its anhydride-modified polypropylene and a water- , Thereby increasing the adhesion between the thermoplastic polyolefin (TPO) base layer and the polyurethane (PU) foam layer. The automobile interior material obtained by bonding the thermoplastic polyolefin (TPO) base layer and the PU foam layer using the composition according to the present invention does not use the phthalate-based plasticizer which is different from the conventional PVC material and causes air pollution and environmental destruction, It is possible to provide an automobile interior material which can be used.

1 is a cross-sectional photograph showing an automobile interior material structure in which a PU foam layer and a TPO skin material (substrate layer) are bonded on a core.

Hereinafter, preferred embodiments of the present invention will be described in detail. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

The present invention relates to an aqueous adhesive composition useful for bonding a polyurethane foam layer to a thermoplastic polyolefin (TPO) substrate layer used as a vehicle interior.

The adhesive composition according to the present invention can be produced by using an ethylene vinyl acetate-based first thickener and a clay-based second thickener in combination with a dicarboxylic acid or its anhydride-modified polypropylene and a water- Can be remarkably improved, thereby enhancing the adhesion between the TPO base layer and the PU foam layer.

More specifically, the present invention relates to a water-dispersible polyurethane resin composition for a vehicle interior material comprising a polypropylene emulsion resin modified with a dicarboxylic acid or an anhydride thereof, a water-dispersed polyurethane resin, an ethylene vinyl acetate-based first thickener, To provide an adhesive composition.

In the present specification, the term "non-chlorine" means that no chlorine component is used when polypropylene is denatured, and substantially no chlorine component is contained.

The adhesive composition according to the present invention is not a polyurethane thickener but an ethylene vinyl acetate thickener and a clay thickener. The ethylene vinyl acetate-based first thickener has a role of imparting thixotropic properties, and Aquatix-8421 is preferably exemplified.

The second thickener of the clay system plays a role of imparting a water plastic (preferably, hectorite, bentonite, etc.).

According to one embodiment, the adhesive composition comprises 50 to 85% by weight of a polypropylene emulsion resin modified with dicarboxylic acid or an anhydride thereof based on the weight of the composition, 5 to 30% by weight of an aqueous dispersion polyurethane resin, 5% by weight of a second thickener, 0.1 to 0.5% by weight of a second thickener, 0.1 to 2% by weight of a wetting agent and 5 to 40% by weight of an aqueous solvent.

According to a preferred embodiment, the wetting agent serves to lower the surface tension of the solution to give a wettability to the material, and particularly preferably to the alkoxylate series.

According to one embodiment, the blending ratio of the polypropylene emulsion resin modified with dicarboxylic acid or its anhydride and the water-dispersed polyurethane resin may be 70:30 to 95: 5 by weight ratio.

According to one embodiment, the polypropylene emulsion resin modified with a dicarboxylic acid or an anhydride thereof may be one produced by grafting a hydrophilic polymer to a polypropylene resin modified with a dicarboxylic acid or an anhydride thereof.

The polypropylene emulsion resin modified with a dicarboxylic acid or its anhydride can be produced by graft-reacting a propylene resin with a dicarboxylic acid or an anhydride thereof.

The acid anhydride may be selected from the group consisting of maleic acid, phthalic acid, itaconic acid, citraconic acid, alkenylsuccinic acid, cis-1,2,3,6-tetrahydrophthalic acid and 4-methyl-1,2,3,6-tetrahydrophthalic acid And anhydrides of dicarboxylic acids selected from the group consisting of maleic anhydride and maleic anhydride.

The polyolefin emulsion resin modified with a dicarboxylic acid or an anhydride thereof preferably has a solid content of 5% by weight or more, more preferably 10% by weight or more, and still more preferably 20% by weight or more. The content is preferably 70% by weight or less, more preferably 60% by weight or less, further preferably 50% by weight or less, particularly preferably 40% by weight or less. The graft ratio of the acid anhydride may be 1 wt% or more, preferably 2 wt% or more and 10 wt% or less, respectively.

The weight average molecular weight (Mw) of the polypropylene emulsion resin modified with dicarboxylic acid or its anhydride is 100,000 to 600,000, preferably 100,000 to 400,000.

The production method of the polypropylene emulsion resin modified with dicarboxylic acid or its anhydride is not particularly limited as long as a polymer satisfying the requirements of the present invention can be produced, and any production method may be used. For example, there may be mentioned a solution modification method (a method of reacting by heating and stirring in a solution), a melt modification method (a method of reacting by heating and stirring with no solvent, or a method of heating and kneading by means of an extruder and reacting). The reaction temperature is usually 50 ° C or higher, preferably 80 to 300 ° C. More preferably, it is in the range of 80 to 200 DEG C in the case of the solution modification method and in the range of 150 to 300 DEG C in the case of the melt-modification method. The reaction time is usually about 2 to 20 hours.

As the radical polymerization initiator to be used in the graft reaction, a suitable radical initiator can be selected and used, and examples thereof include organic peroxides and azonitriles. Examples of the organic peroxide include peroxyketals such as di (t-butylperoxy) cyclohexane, hydroperoxides such as cumene hydroperoxide, dialkyl peroxides such as di (t-butyl) peroxide, Diacyl peroxides such as peroxide, and peroxy esters such as t-butyl peroxyisopropyl carbonate. Examples of the azonitrile include azobisbutyronitrile and azobisisopropylnitrile. Of these, benzoyl peroxide and t-butyl peroxyisopropyl monocarbonate are particularly preferred.

These may be used singly or in combination of two or more kinds. The ratio of the radical polymerization initiator to the graft copolymerization unit is usually in the range of radical polymerization initiator: graft copolymerization unit = 1: 100 to 2: 1 (molar ratio). Preferably 1:20 to 1: 1 (molar ratio).

According to one embodiment, the water-dispersed polyurethane resin may be obtained by polymerizing a diisocyanate compound and a polycarbonate diol. Specifically, the water-dispersed polyurethane resin is not particularly limited, and examples thereof include (i) a urethane polymer obtained by reacting (ii) a polyisocyanate component with a component containing an average of at least two active hydrogens in one molecule, containing urethane polymer obtained by reacting a component (i) and a component (ii) with an isocyanate group-containing prepolymer obtained by reacting the isocyanate group with an excess of a chain extender such as a diol. As the component containing an average of at least two active hydrogens in one molecule of the component (i), it is preferable to have a hydroxyl group-active hydrogen. In particular, a polycarbonate diol is preferred. Polycarbonate diol represented by the general formula HO-R- (OC (O) -OR) X-OH wherein R is a saturated fatty acid diol residue having 1 to 12 carbon atoms, x is the number of repeating units of the molecule, And they are usually an integer of 5 to 50. They are an ester exchange method in which a saturated aliphatic diol and a substituted carbonate (diethyl carbonate, diphenyl carbonate, etc.) are reacted under conditions that the hydroxyl group is excessive, Phosgene, or, if necessary, thereafter additionally reacting a saturated aliphatic diol.

According to one embodiment, the polypropylene resin modified with a dicarboxylic acid or an anhydride thereof has a weight average molecular weight of 100,000 to 300,000, and a high molecular weight polypropylene type resin having an isotactic chain molar fraction L value of 0.30 to 0.70 in formula 35 to 65% by weight of resin (A);

30 to 60% by weight of a low molecular weight polypropylene resin (B) having a weight average molecular weight of 10,000 to 50,000 and an isotactic chain molar fraction L value of 0.30 to 0.70 in the formula (1); And

0.1 to 5.0% by weight of a high-crystalline low-molecular-weight polypropylene resin (C) having a weight-average molecular weight of 5,000 to 50,000 and an isotactic recurrence mole fraction L of 0.70 to 0.75 in the formula (1).

[Equation 1]

Here, Tm is the melting point of the resin, Tm ⁰ is the melting point of a perfect crystal, R is the gas constant, ΔH _υ is determinable units per 1 mol melting enthalpy, L is the molar fraction of isotactic chain.

According to one embodiment, the hydrophilic polymer is a polyether resin having an amino group and has a weight average molecular weight of 500 to 2,000, and 5 to 20 parts by weight of a hydrophilic polymer is added to 100 parts by weight of a polypropylene resin modified with a dicarboxylic acid or an anhydride thereof Graft reaction may be used.

The polypropylene emulsion resin modified with a dicarboxylic acid or an anhydride thereof used in the preparation of the composition according to the present invention is a polypropylene emulsion resin modified with a dicarboxylic acid or an anhydride thereof, preferably a maleic anhydride with an ether group grafted with a substituent, When it is blended with a polyurethane resin, the compatibility is excellent and the adhesiveness can be improved.

According to one embodiment, the water-dispersed polyurethane resin may be obtained by polymerizing a diisocyanate compound and a polycarbonate diol. Specifically, the water-dispersed polyurethane resin is not particularly limited, and examples thereof include (i) a urethane polymer obtained by reacting (ii) a polyisocyanate component with a component containing an average of at least two active hydrogens in one molecule, containing urethane polymer obtained by reacting a component (i) and a component (ii) with an isocyanate group-containing prepolymer obtained by reacting the isocyanate group with an excess of a chain extender such as a diol. As the component containing an average of at least two active hydrogens in one molecule of the component (i), it is preferable to have a hydroxyl group-active hydrogen. In particular, a polycarbonate diol is preferred. Polycarbonate diol represented by the general formula HO-R- (OC (O) -OR) X-OH wherein R is a saturated fatty acid diol residue having 1 to 12 carbon atoms, x is the number of repeating units of the molecule, And they are usually an integer of 5 to 50. They are an ester exchange method in which a saturated aliphatic diol and a substituted carbonate (diethyl carbonate, diphenyl carbonate, etc.) are reacted under conditions that the hydroxyl group is excessive, Phosgene, or, if necessary, thereafter additionally reacting a saturated aliphatic diol.

The weight-average molecular weight (Mw) of the water-dispersed polyurethane resin may be 1,000 to 10,000, and when the molecular weight is within this range, it is preferable because the compatibility and the adhesive strength are excellent.

According to a preferred embodiment, the weight ratio of the polypropylene resin modified with dicarboxylic acid or its anhydride to the water-dispersed polyurethane resin may be 1: 0.01 to 0.5, preferably 1: 0.05 to 0.2.

If the content of the water-dispersed polyurethane resin is more than the above range, compatibility and adhesion to PP may be deteriorated, and a small amount may deteriorate the adhesion to the PU foam.

According to one embodiment, the aqueous solvent is selected from the group consisting of ethanol, n-propanol, isopropanol, n-butanol, 2-butanol, isobutanol, n- pentanol, isopentanol, Alcohols, alcohols, cyclohexanol and 4-methyl-1-pentanol.

According to one embodiment, the aqueous solvent may be mixed for 5 to 50% by weight of isopropanol and 50 to 95% by weight of ion exchange water. Preferably, the content of isopropanol in the mixed solvent is 20 wt% or less, preferably 10 wt% or less, more preferably 5 wt% or less.

According to one embodiment, the viscosity of the adhesive composition may be from 900 to 1,000 cps as measured by a Brookfield viscometer, and as measured by Cup # 3 of from 40 to 80 seconds. Given this range of viscosity, an adhesive layer having a thickness of 600 microns or more can be obtained.

The coating composition according to the present invention may contain various other additives as necessary insofar as it does not significantly impair the effect of the present invention. Various stabilizers such as an ultraviolet absorber, an antioxidant, a weather-resistant stabilizer, and a heat-resistant inhibitor; Colorants such as titanium oxide and organic pigments; Various additives such as pigments, carbon black, conductivity imparting agents such as ferrite, dyes, pigment dispersing agents, leveling agents, antifoaming agents, preservatives, fungicides and rust inhibitors may be used in combination.

The present invention also relates to a method of making a thermoplastic polyolefin (TPO) base layer, comprising the steps of: applying an aqueous adhesive for automotive interior materials as described above to a thermoplastic polyolefin (TPO) base layer; And

And joining a polyurethane foam layer to the thermoplastic polyolefin (TPO) base layer.

The method of applying the adhesive composition according to the present invention is not particularly limited and a known method can be used. For example, it can be applied by various coating methods such as a spray coat, a bar coat, a spin coat, a dip coat, and a gravure coat. Generally, spray coating is applied to a large molded article such as a bumper for automobiles or home appliances, and coating with a gravure coat or a bar coat is applied to a plastic film or sheet.

When an automotive interior material is manufactured by bonding a TPO skin material to a polyurethane foam using an adhesive composition according to the present invention, the automobile interior material is excellent in all properties such as adhesive strength, and is environment-friendly since it does not contain chlorine.

Hereinafter, specific embodiments of the present invention will be described.

Herein, the% content means weight% unless otherwise stated, and the molecular weight of the resin means the weight average molecular weight (Mw) unless otherwise stated. The weight average molecular weight (Mw) was determined by a known method using a solvent (tetrachlorobenzene) using GPC.

As the water-based solvent, a mixed solvent (IPA 20 wt%) in which isopropanol (IPA) and ion exchange water were mixed was used.

≪ Preparation Example > GWA0701

The polypropylene emulsion resin modified with dicarboxylic acid or its anhydride used in the experiment is GWA0701 of Lotte Chemical Co., The polypropylene emulsion resin GWA0701 modified with a dicarboxylic acid or its anhydride was prepared according to the following Reaction Scheme 1 and has a weight average molecular weight (Mw) of 100,000 viscosity (cps) of 10 and a solid content of 30%.

[Reaction Scheme 1]

A thermometer and a stirrer, 100 g of polypropylene was introduced, and the mixture was heated to 140 DEG C to dissolve it. 15 g of maleic anhydride and 10 g (10% by weight) of benzoyl peroxide toluene solution were slowly added dropwise over 3 hours, and reacted for another 3 hours. After completion of the reaction, the reaction solution was added dropwise to 2 L of acetone to be crystallized, and then washed once and dried to obtain an acid-modified polypropylene resin. The polypropylene resin polymerized in the above was placed in a 3L stainless steel reactor equipped with a thermometer and a stirrer and heated to 140 DEG C and then dissolved with 10 g of a hydrophilic polymer. Then 200 g of isopropanol (IPA) and 400 g of water Respectively. Substitution and concentration processes were carried out to remove toluene and isopropanol to obtain an acid-modified polypropylene emulsion resin.

≪ Comparative Example 1 &

285 g of a polypropylene emulsion resin GWA0701 modified by maleic anhydride GWA0701 (Lotte Chemical Co., Ltd., solids content 30%) was added to a 1 L round bottom flask equipped with a stirrer and a stirrer, and 32 g of a water dispersed polyurethane resin (UH XP 2648 from Covestro, , 2 g of wetting agent (Surfynol 104PA from Evonik) 0.5 g of a thickener (hectorite) was added and stirred for 5 minutes at a stirring rate of 500 rpm, followed by the addition of 76 g of IPA (isopropyl alcohol) and an ion exchange water mixed solvent to prepare an adhesive.

≪ Example 1 >

288 g of a polypropylene emulsion resin GWA0701 modified with maleic anhydride (Lotte Chemical Co., Ltd., solid content 30%) was added to a 1 L round bottom flask equipped with a stirrer and a stirrer, and 32 g of a water dispersed polyurethane resin (UH XP 2648 from Covestro, 2 g of a wetting agent (Surfynol 104PA from Evonik), 8 g of a thickener (Aquatix 8421 from BYK) and 2 g of a thickener (hectorite) were added and stirred for 5 minutes at a stirring speed of 500 rpm. 68 g of IPA (isopropyl alcohol) .

≪ Comparative Example 2 &

320 g of a polypropylene emulsion resin GWA0701 modified with maleic anhydride (Lotte Chemical Co., Ltd., solid content: 30%) was added to a 1 L round bottom flask reactor equipped with a stirrer and a stirrer, and 2 g of a wetting agent (Surfynol 104PA from Evonik) was added and stirred at 500 rpm for 5 minutes And then 78 g of IPA (isopropyl alcohol) and an ion-exchange water mixed solvent were added to prepare an adhesive.

≪ Comparative Example 3 &

(UH XP 2648, Covestro, UH XP 2648, solid content 35%) was charged with 288 g of polypropylene emulsion resin GWA0701 modified with maleic anhydride (Lotte Chemical Co., Ltd., solid content 30%) in a 1 L round bottom flask reactor equipped with a stirrer and a stirrer. , 2 g of a wetting agent (Surfynol 104PA from Evonik) and 4 g of a thickener (PU-1191 from Basf) were added to the solution, stirred for 5 minutes at 500 rpm, and 74 g of IPA (isopropyl alcohol) and ion exchange water were added.

≪ Comparative Example 4 &

288 g of polypropylene emulsion resin GWA0701 modified with maleic anhydride (solid content 30%) was added to a 1 L round bottom flask reactor equipped with a stirrer and a stirrer, and 32 g of a water-dispersed polyurethane resin (UH XP 2648 from Covestro, solid content 35% 2 g of a wetting agent (Surfynol 104PA from Evonik) and 4 g of a thickener (Aquatix 8421 from BYK) were added and stirred for 5 minutes at a stirring speed of 500 rpm. 74 g of IPA (isopropyl alcohol) and an ion exchange water mixed solvent were then added to prepare an adhesive.

Table 1 shows each component and the content of the composition in a weight ratio.

ingredient compound  Comparative Example 1  Example 1 Comparative Example 2  Comparative Example 3  Comparative Example 4 Suzy Polypropylene emulsion resin modified with dicarboxylic acid or its anhydride (GWA0701) 72 72 80 72 72 Water-dispersed polyurethane resin
(UH XP 2648, Covsetro) 8 8 - 8 8 additive Wetting agent
(Surfynol 104PA, Evonik) 0.5 0.5 0.5 0.5 0.5 Symptom
point
My PU-1191 (Basf) - - - 1.0 - Aquatix-8421 (BYK) 2.0 - - 1.0 Hectorite 0.5 0.5 - - - menstruum menstruum
(Ion exchange water, Lotte Chemical Co., Ltd.
/ Isopropyl alcohol,
Korea Alcohol Industry Co., Ltd.) 19.0 17.0 19.5 18.5 18.5

<Experimental Example>

The properties of the adhesive compositions of Examples and Comparative Examples were evaluated as follows.

1) Appearance evaluation: Each adhesive composition shown in Table 1 was applied to TPO sheet (RE25 of GS Caltex) at a thickness of 100 탆 by using an applicator, and after heat treatment at 100 캜 for 10 minutes, Based on the criteria of.

* 1 = Excellent wetting property after application.

* 2 = Good wetting property after application

* 3 = Wetting property after application is poor.

2) Viscosity: The viscosity of each adhesive composition shown in Table 1 was measured using Jhan cup # 3 (Soltec) using Jhan cup # 3 (Soltec) and the Brookfield viscometer (LVDV-II + P, 63 &Quot; spindle &quot;) was used to determine the dynamic viscosity of the composition.

3) Thickness of coating film: To measure film thickness, each adhesive composition prepared by the composition shown in <Table 1> was uniformly applied to a TPO sheet with a tin plate by spray coating and heat-treated at 100 ° C for 10 minutes , And a dry film thickness was measured using an Electrometer (LG63099-012) to calculate the humidity film thickness.

4) Adhesive strength: Each adhesive composition shown in <Table 1> was uniformly applied to TPO sheet (RE25 of GS Caltex) by spray coating and heat treated at 100 ° C for 10 minutes and then heat treated TPO sheet (GS Caltex RE25) and PU foam (Bayfill of Covestro) were laminated to a high-temperature high-pressure roller. The adhesive strength was measured by applying a test speed of 100 mm / min with a universal testing machine.

The results are shown in Table 2.

Comparative Example 1 Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Exterior 2 One 3 One One Viscosity Jhan Cup # 3 19 62 10 33 22 Dynamic viscosity (cps) 35 951 25 931 250 Film Thickness (㎛) 90 785 50 495 389 Adhesion strength (kgf / cm ² ) 3.2 10.5 2.5 7 5.5

According to the above results, the viscosity of the adhesive composition according to the present invention using an EVA-based thickener (Aquatix 8421) and hectorite instead of the polyurethane-based thickener (PU-1191) was measured by a Brookfield viscometer 900 cps, and the value measured with the cup # 3 is higher than 40 seconds, and the thickness of 600 microns or more can be obtained. On the other hand, the adhesive composition of the comparative example has a very limited film thickness compared with the adhesive composition of the comparative example, and the adhesion strength between the PU foam-TPO skin is remarkably different.

Although the present invention has been described in connection with the specific embodiments of the present invention, it is to be understood that the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. Various modifications and variations are possible.

Claims (11)

A water-dispersible polyurethane resin, an ethylene vinyl acetate-based first thickener, a clay-based second thickener, a wetting agent and an aqueous solvent, wherein the water-dispersible polyurethane resin is modified with a dicarboxylic acid or an anhydride thereof. The method according to claim 1,
Based on the weight of the composition, 50 to 85% by weight of a polypropylene emulsion resin modified with a dicarboxylic acid or an anhydride thereof, 5 to 30% by weight of a water-dispersed polyurethane resin, 1 to 5% by weight of a first thickener, To 0.5% by weight, a wetting agent in an amount of 0.1 to 2% by weight and an aqueous solvent in an amount of 5 to 40% by weight. The method according to claim 1,
Wherein the blend ratio of the polypropylene emulsion resin modified with dicarboxylic acid or its anhydride to the water-dispersed polyurethane resin is 70:30 to 95: 5 by weight. The method according to claim 1,
Wherein the polypropylene emulsion resin modified with the dicarboxylic acid or its anhydride is prepared by grafting a hydrophilic polymer to a polypropylene resin modified with a dicarboxylic acid or an anhydride thereof. 5. The method of claim 4,
The hydrophilic polymer is a polyether resin having an amino group and has a weight average molecular weight of 500 to 2,000 and is produced by grafting 5 to 20 parts by weight of a hydrophilic polymer to 100 parts by weight of a polypropylene resin modified with a dicarboxylic acid or an anhydride thereof By weight based on the total weight of the composition. The method according to claim 1,
The dicarboxylic acid may be selected from the group consisting of maleic acid, phthalic acid, itaconic acid, citraconic acid, alkenylsuccinic acid, cis-1,2,3,6-tetrahydrophthalic acid and 4-methyl-1,2,3,6-tetrahydrophthalic acid Wherein at least one selected from the group consisting of water, The method according to claim 1,
Wherein the second clayey thickener is at least one selected from hectorite and bentonite. The method according to claim 1,
Wherein the aqueous solvent is selected from the group consisting of ethanol, n-propanol, isopropanol, n-butanol, 2-butanol, isobutanol, n- pentanol, isopentanol, And 4-methyl-1-pentanol. A waterborne adhesive composition for automotive interiors. The method according to claim 1,
Wherein the water-based solvent is a mixed solvent of 5 to 50% by weight of isopropanol and 50 to 95% by weight of ion-exchanged water. The method according to claim 1,
Wherein the viscosity of the adhesive composition is 900 to 1,000 cps as measured by a Brookfield viscometer and 40 to 80 seconds as measured by cup # 3. Applying a waterborne adhesive for automotive interiors according to any one of claims 1 to 10 to a thermoplastic polyolefin (TPO) base layer; And
And joining a polyurethane foam layer to the thermoplastic polyolefin (TPO) base layer.

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