KR101286876B1 - One component aqueous coating composition for plastic interior in automobile - Google Patents

Abstract

The present invention relates to a one-component water-soluble coating composition for automobile plastic interior materials.

The water-soluble coating composition for automobile plastic interior materials according to the present invention has excellent scratch resistance and abrasion resistance, and has an effect of covering injection damage and fine parts when applied to automotive interior plastic materials.

Description

One component aqueous coating composition for plastic interior in automobile}

The present invention relates to a one-component water-soluble coating composition for automobile plastic interior materials.

Plastics used as automotive interior materials are vulnerable to chemicals, erosion, ultraviolet rays, heat deformation, etc., and have surface defects resulting from defects in surface injection, surface defects, and color limitations.

Among the plastic resins, polypropylene-based plastics are greatly inferior in adhesion with the coating due to low surface energy, nonpolarity and high crystallinity. Therefore, preprocessing is indispensable to improve the adhesion to the resin. In conventional solvent type paints, the surface properties are changed by flame treatment, ozone treatment, corona discharge treatment, and plasma treatment by pretreatment, or chlorinated polyolefin primer treatment is used to solve adhesion problems between resin and paint. However, flame treatment, ozone treatment, corona discharge treatment, plasma treatment, and primer treatment for the adhesion improvement of propylene-based plastic resins require a separate treatment device and cost increases due to various environmental problems and additional processes. There is a problem.

In addition, since the chlorinated polyolefin-based primer is usually dissolved in an organic solvent such as toluene, a primer that imparts adhesion to the polypropylene resin is generally a paint containing an organic solvent.

Generally, such a solvent type paint is a two-component solvent type paint which uses an isocyanate curing agent for 10 to 30% by weight of solid acrylic or polyester paint. A large amount of organic solvents contained in these solvent-based paints generate volatile organic compounds (VOC's), which cause environmental pollution, have a bad smell, and can damage workers' health. The situation is receiving a formulation. Therefore, paint manufacturers continue to attempt to reduce solvent content in accordance with environmental protection programs centered on developed countries.

In order to solve the above problems, in the field of automotive interior plastic parts, water-based paints are applied instead of oil-based paints, and the application of water-soluble paints has brought great innovation in terms of reducing volatile organic compounds. In addition, water-soluble paints not only have health and environmental benefits, but also overcome the cracks or erosion of plastic surfaces due to the attack of constituents of solvent-based paints, such as strong solvents such as xylene or methyl isobutyl ketone. Can be.

In general, the main component of the water-soluble paint is the acrylic emulsion resin, the acrylic emulsion resin is water-based odor and less volatile organic compounds than the solvent-type resin has the advantage of low coating film formation temperature (Minimum) to improve the adhesion of the resin Low Film Forming Temperature (MFFT). In addition, since the interior materials for automobiles should be designed to have a low gloss, the surface of the coating film is roughened with a matting agent such as silica to lower the gloss.

Therefore, by designing the lowest film forming temperature of the acrylic emulsion resin which is the main component of the water-soluble paint used in the field of automotive interior plastic parts, it is possible to improve adhesion when applied to the field of automotive interior plastic parts. However, it is difficult to control the adhesiveness, and there is a disadvantage in that the mechanical properties of the coating film are inferior. In addition, the matting agent applied in order to lower the gloss drops the surface strength of the coating film, which makes the wear-resistant and scratch-resistant surface weak.

Accordingly, the present inventors, while studying a water-soluble coating composition excellent in scratch resistance and wear resistance, when the water-soluble coating composition containing a chlorinated polyolefin-based emulsion resin is applied to the automotive interior plastic material to cover the injured part of the injection It was confirmed that the scratch resistance and wear resistance is excellent and completed the present invention.

The present invention is to provide a one-component water-soluble coating composition for automotive plastic interior materials.

The present invention

1) 10-30% by weight of chlorinated polyolefin emulsion resin,

2) 15-35% by weight of acrylate styrene copolymer emulsion resin,

3) 20-40% by weight of ion-exchanged water,

4) 10-20 wt% of propylene glycol solvents,

5) 1 to 5% by weight of fluorine-modified polyethylene wax having an average particle diameter of 5 to 6 µm, and

6) Provides a one-component water-soluble coating composition for automobile plastic interior materials containing 1 to 5% by weight of acrylic beads having an average particle diameter of 3㎛.

Hereinafter, each component of the water-soluble coating composition which concerns on this invention is demonstrated in detail.

In the water-soluble coating composition according to the invention, the 1) chlorinated polyolefin The emulsion resin acts to enhance the adhesion of the coating film. The chlorine content of the chlorinated polyolefin emulsion resin is preferably 15 to 25% by weight based on solids.

The content of the chlorinated polyolefin emulsion resin is preferably contained in 10 to 30% by weight based on the total weight of the water-soluble coating composition, if the content is less than 10% by weight does not form a coating film with a propylene-based material causes problems in adhesion, If it exceeds 30% by weight, there is a problem in price increase and compatibility with other resins.

In the water-soluble coating composition according to the present invention, the 2) acrylate styrene copolymer emulsion resin serves to enhance the adhesion of the coating film.

The content of the acrylate styrene copolymer emulsion resin is preferably included in 15 to 35% by weight based on the total weight of the water-soluble coating composition, if the content is less than 15% or more than 35% by weight of the coating film with the propylene-based material There is a problem that the adhesion is not formed, and other physical properties are also degraded.

In the water-soluble coating composition according to the present invention, the 3) ion-exchanged water is the main solvent, the content of the ion-exchanged water is preferably contained in 20 to 40% by weight relative to the total weight of the water-soluble coating composition.

In the water-soluble coating composition according to the present invention, the 4) propylene glycol solvents have a great influence on the anti-popping and smoothing of the coating film as a co - solvent , lowering the minimum film forming temperature, and smoothing the atomization of the paint during painting work In addition, it greatly contributes to the volatilization of water, the main solvent. Therefore, by forming a coating film with the propylene-based material serves to help the adhesion.

The propylene glycol solvent includes at least one selected from the group consisting of propylene glycol monobutyl ether, propylene glycol propyl ether, dipropylene glycol butyl ether, and propylene glycol phenyl ether.

The content of the propylene glycol solvent is preferably contained in 10 to 20% by weight based on the total weight of the water-soluble coating composition, if the content is less than 10% by weight does not form a coating film with the propylene-based material causes problems in adhesion, If it exceeds 20% by weight, the paint swells and the viscosity becomes high, making it difficult to serve as a paint.

In the water-soluble coating composition according to the present invention, 5) the fluorine-modified polyethylene wax having an average particle diameter of 5 ~ 6㎛ can use a conventional fluorine-modified polyethylene wax used in the art. It is preferable that the average particle diameter of the said fluorine modified polyethylene wax is 5-6 micrometers. If the average particle diameter of the fluorine-modified polyethylene wax is less than 5㎛ the light scattering operation is insufficient, the matting effect is small, if it exceeds 6㎛ the coating film surface roughness may act as a factor of poor appearance and scratches.

The content of the fluorine-modified polyethylene wax is preferably 1 to 5% by weight based on the total weight of the water-soluble coating composition. If the content of the fluorine-modified polyethylene wax is less than 1% by weight, the surface modification effect is less and the wear resistance is lowered. If the content of the fluorine-modified polyethylene wax is less than 5% by weight, the wear resistance is improved, but the inorganic component of the coating is increased, so it is broken and buried like char, Problems with appearance and scratches occur.

In the water-soluble coating composition according to the present invention, 6) the acrylic beads having an average particle diameter of 3㎛ serves to restore the absorption on the coating film. It is preferable that the average particle diameter of the said acrylic bead is 3 micrometers. If the average particle diameter of the acrylic beads is less than 3㎛, the light scattering action is insufficient, the matting effect is small, the particles are too high and scratches are well seen, if the thickness exceeds 3㎛ the coating film surface is rough, which leads to poor appearance and scratch reduction. Can act as a factor.

The content of the acrylic beads preferably includes 1 to 5% by weight based on the total weight of the water-soluble coating composition. If the acrylic bead is less than 1% by weight, the matting effect is low and the scratch resistance is lowered. If the acrylic bead is more than 5% by weight, the matting and matting effect is so good that the desired glossiness cannot be obtained. And scratch deterioration.

In the water-soluble coating composition of the present invention, conventional pigments and additives known in the art may be used as necessary. The additives include wetting agents, pH adjusting agents, light stabilizers, thickeners, surface control agents or antifoaming agents.

As said pigment, the pigment (black paste) which is normally used, or the pigment (black paste) which disperse | distributed for 1 hour or more after mixing a pigment with water and a dispersing agent in the ratio of 1: 3: 1 can also be used.

The antifoaming agent is applied to suppress the generation of bubbles generated in the aqueous dispersion of the pigment and paint production, and to suppress or eliminate phenomena such as pinholes or poppings caused when the coating film is formed. Examples of the antifoaming agent may be used by selecting one or more from the group consisting of BYK 028, BYK 032, BYK 032, BYK 036, BYK 037, HS ANTIFOAMER OSI, SN DEFOAMERVL manufactured by BYK, a mineral oil-based antifoaming agent.

The water-soluble coating composition according to the present invention may be applied to a plastic for automotive interior materials, and then dried at a temperature of 80 ° C. for about 20 minutes to form a coating film.

The water-soluble coating composition for automobile plastic interior materials according to the present invention has excellent scratch resistance and abrasion resistance, and has an effect of covering injection damage and fine parts when applied to automotive interior plastic materials.

Hereinafter, preferred embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following examples are merely provided to more easily understand the present invention, and the contents of the present invention are not limited thereto.

Example  One

20 g of chlorinated polyolefin emulsion resin, 25 g of acrylate styrene copolymer emulsion resin, 27 g of ion-exchanged water, 15 g of propylene glycol monobutyl ether, 0.3 g of wetting agent (BYK 345c), 0.4 g of pH regulator (DMEA), TS 100 2.5 g, 3 g of acrylic beads having an average particle diameter of 3 μm, 2 g of fluorine-modified polyethylene wax, 0.5 g of antifoaming agent (BYK 028), 0.5 g of light stabilizer (Tinuvin 5151), 1.8 g of thickener (HV30), and 4 g of pigment, were mixed The composition was prepared.

Example  2 to 4 and Comparative example  One  :

To the composition and composition ratio shown in Table 1 below to prepare a coating composition in the same manner as in Example 1.

Experimental Example  : Measurement of physical properties

In order to find out the physical properties of the water-soluble coating composition according to the invention, the following experiment was performed.

Using each of the water-soluble coating composition prepared in Examples 1 to 4 and Comparative Example 1 spray-coated to a plastic resin with a dry coating thickness of 20㎛, dried for 20 minutes at a temperature of 80 ℃, and left for 24 hours The physical properties of the coating film prepared using one coating specimen were measured as follows.

The results are shown in Table 1.

One. Scratch resistance

A scratcher was placed on a machine that reciprocated 100 times per stroke and 0.2 times per minute, and the coating film was damaged when moved vertically to the coating film surface under a load of 300 g.

2. Wear resistance

A 1.0 kgf load, a 100 mm stroke, a friction speed of 100 mm / sec, and a friction material were subjected to an abrasion test using a canvas of JIS L3102 to compare exposure of materials to the adherend.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Chlorinated Polyolefin Emulsion Resin 20 20 20 20 20 Acrylate styrene emulsion 25 25 25 25 25 Ion-exchange water 27 28 28 29.5 27 BYK 345 0.3 0.3 0.3 0.3 0.3 DMEA 0.4 0.4 0.4 0.4 0.4 TS 100 0.5 0.5 0.5 0.5 0.5 Acrylic beads with an average particle diameter of 3㎛ 3 3 2 1.5 - Acrylic beads with an average particle diameter of 2 μm - - - - 3 Fluorine Modified Polyethylene Wax 2 One 2 One - Modified polyethylene wax - - - - 2 Propylene Glycol Monobutyl Ether 15 15 15 15 15 BYK 028 0.5 0.5 0.5 0.5 0.5 Tinuvin 5151 0.5 0.5 0.5 0.5 0.5 HV30 1.8 1.8 1.8 1.8 1.8 Pigment 4 4 4 4 4 Properties Scratch resistance ○ ○ ○ ○ × Wear resistance ○ △ △ △ ×

※ ○: Excellent, △: Normal, ×: Poor

As shown in Table 1, it can be seen that the water-soluble coating composition for automobile plastic interior materials according to the present invention is excellent in scratch resistance and wear resistance.

The water-soluble coating composition for automobile plastic interior materials according to the present invention has excellent scratch resistance and abrasion resistance, and has an effect of covering injection damage and fine parts when applied to automotive interior plastic materials.

Claims (1)

1) 10-30% by weight of chlorinated polyolefin emulsion resin, 2) 15-35% by weight of acrylate styrene copolymer emulsion resin, 3) 20-40% by weight of ion-exchanged water, 4) 10-20 wt% of propylene glycol solvents, 5) 1 to 5% by weight of fluorine-modified polyethylene wax having an average particle diameter of 5 to 6 µm, and 6) One-component water-soluble coating composition for automobile plastic interior materials containing 1 to 5% by weight of acrylic beads having an average particle diameter of 3㎛.