JPH0556196B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing an anti-glare instrument panel having a soft feel and anti-glare properties. (Prior art) Automotive instrument panels have traditionally been manufactured by Japanese Patent Publication No. 59-36925, Japanese Patent Publication No. 55-19535,
It is manufactured by the mold coating method (MCU method), vacuum forming method, slush forming method, etc. described in JP-A-60-101014. However, in order to impart an anti-glare effect to the instrument panel obtained by these methods, the surface of the mold is sandblasted or a silica-based matte paint is applied to the molded product to make the surface glossy.
Although it is possible to reduce the color saturation, this results in defects such as white blur, uneven gloss, and roughness, as well as a decrease in color saturation and a decrease in quality. Furthermore, JP-A-57-186528 describes an anti-glare instrument panel using a raised blanket as a surface material, but this raised blanket has a backing sheet such as a soft or semi-hard synthetic resin sheet in contact with the back surface. It is constructed based on highly stretchable knitted fabric that can be vacuum formed in a vacuum, and the instrument panels made using this are luxurious and have a rich appearance, but as an anti-glare surface material, (1) (2) Applying a staining paint to each brushed fiber to make each brushed fiber matt, Are suitable. Therefore, this method, which is characterized by the use of a raised blanket, requires special techniques and equipment, is inevitably expensive, and is difficult to apply to instrument panels of all car models. be. (Problems to be Solved by the Invention) The purpose of the present invention is to solve the problem of uneven gloss, roughness,
It is an object of the present invention to provide a method for producing an anti-glare instrument panel that is free from drawbacks such as a decrease in color saturation and a decrease in quality. Another object of the present invention is to eliminate the need for special equipment for the instrument panel skin layer that is molded using a molding method that does not allow the use of raised blankets (slush molding, MCU method).
It is an object of the present invention to provide a method for manufacturing an anti-glare instrument panel that can impart anti-glare properties by a simple and inexpensive method. (Means for Solving the Problems) The present invention is an instrument panel molded product obtained by applying a two-component reactive urethane paint into the cavity of a foam mold for molding instrument panel products, and then injecting and foaming a semi-rigid urethane stock solution. or instrument panel parts, or those made by molding methods such as slush molding or vacuum molding.
A two-component reactive pattern paint containing spherical urethane beads as the main ingredient is applied to the surface of a molded product with a PVC skin or a molded instrument panel or instrument panel part made by resin injection molding. Method for manufacturing an instrument panel with anti-glare properties In the present invention, the instrument panel molded product or instrument panel parts that provide anti-glare properties include a full instrument panel, an instrument panel topper, a safety pad, a meter cluster (meter hood), which are integrally molded products,
Examples include instrument panel parts that require assembly, such as an instrument panel lower. The two-component reactive pattern paint used in the present invention is a polyurethane resin paint consisting of a main agent and a curing agent,
The main ingredient contains spherical urethane beads.
This paint provides a coating film with a soft velvety feel, and has a matte surface with little change in reflectance depending on the angle, and has excellent anti-glare properties. As a specific example of this paint, there may be mentioned, for example, the product name "Ravi" manufactured by Ohashi Chemical Industry Co., Ltd. Examples of objects to be coated in the present invention include instrument panel molded products or instrument panel parts obtained by applying a two-component reactive urethane paint into the cavity of a foam mold for molding instrument panel products, and then injecting and foaming a semi-hard urethane stock solution. be able to. Examples of two-component reactive urethane paints include trimethylolpropane TDI adduct (trade name Desmodyur L), triphenylmethane triisocyanate (trade name Desmodyur R), and tris(4-phenyl isocyanate) thiophosphate (trade name Desmodyur RF), hexamethylene diisocyanate trimer (trade name Desmodyur N),
Trimethylolpropane LDI adduct (product name LD
It is used in combination with polyisocyanates such as -100) and polyols such as hydrous acid group polyesters or polyethers, and contains fillers, reaction accelerators, flow improvers, anti-skinning agents, matting agents, anti-gelling agents, pigments, etc. It is mixed appropriately. In addition, examples of curing accelerating catalysts include dimethylethanolamine, N-ethylmorpholine, methyldiethanolamine, triethylamine, triethylenediamine, N,N,N',N'-tetramethyl-1,3-butanediamine, N,N, N′, N′−
Amine compounds such as tetramethylpropylene diamine, dibutyltin dilaurate, octylic acid
Metal compounds such as tin, cobalt naphthenate, lead naphthenate, etc. can be used. In addition, the urethane foam material to be injected can be a so-called cold-cure semi-rigid foam with a density of about 0.1 to 1.0 g/cm ³ , but it is 0.2 to 0.4 when mold coating is used for automotive interior safety parts, etc. It is preferable to use a foam with a density on the order of g/cm ³ . Furthermore, it is better to use a foam with the best possible strength and elongation; as a guideline, a urethane foam with a tear strength of 3 kg/cm or more and an elongation of 80% or more is desirable. In addition, in order to make the coating performance of the two-component urethane coating more reliable, the density of the foam should be gradually increased as the foam's cell structure moves from the inner layer to the outer layer (skin side). A so-called integral skinned form is preferable. In the present invention, the object to be coated is, for example, an instrument panel molded product or instrument panel part with a PVC skin made by a conventional molding method such as slush molding or vacuum forming, or an instrument panel molded product or instrument panel part made by a resin injector molding method. etc. can be mentioned. (Effects of the Invention) The instrument panel obtained by the method of the present invention has the following excellent effects. 1. Has anti-glare properties without sacrificing quality. 2. Excellent heat resistance, weather resistance, chemical resistance, and light resistance. 3. Surface gloss value (gloss) can be controlled and supplied stably. 4. It is low cost. 5. It has excellent bending resistance, crack resistance, and abrasion resistance compared to conventional matte paints. 6 The urethane paint currently used in the MCU method is a non-yellowing two-component curing type urethane paint.
In the method for manufacturing an anti-glare instrument panel of the present invention, the above-mentioned urethane paint does not need to be non-yellowing;
An inexpensive two-component curable urethane paint can be used. If a general paint is used to make it completely matte, a large amount of matting agent (such as silica) will be added, resulting in poor dispersion and poor physical properties. The present invention is a two-component polyurethane resin paint, and since the spherical colored urethane beads create minute irregularities on the surface of the paint film, it has a soft touch and scatters light, giving it an excellent anti-glare effect. In addition, it is heat resistant, weather resistant,
Excellent chemical resistance and light resistance. (Example) Examples will be described below. Note that parts indicate parts by weight. Example 1 A mixture of 95 parts of wax-based mold release agent and 5 parts of dibutyltin dilaurate was uniformly applied to the inner surface of the above-mentioned heated mold for instrument panel molding (surface temperature: 60°C), and then a predetermined area of the above-mentioned inner surface was applied. Set the core material in position, and release the above mold using an air spray gun with a mixed solution of 80 parts polyol, 10 parts isocyanate curing agent, and 30 parts thinner of a two-component curable urethane paint (manufactured by Nippon B Chemical). Apply the agent to the inner surface of the mold to a thickness of approximately 50μ. After air drying in this state for about 2 minutes, the following semi-rigid urethane foam compounding solution was injected and the mold was closed. After closing the mold, leave it at room temperature for about 10 minutes, then open the mold and demold the molded product. The surface of the obtained molded product was washed with a rag containing thinner, and a matte paint containing urethane beads [Rabbi (S) Black No. 6] was applied to the surface using an air spray gun, and heated at 80°C x 30°C. The target instrument panel was obtained by heating for a minute. Urethane foam composition part MS200* 70 Polymer polyol 31/28** 20 Triethanolamine 5 Diethylene glycol 9.4 Dibutyltin dilaurate 0.01 Triethylene diamine 0.1 Silicone SRX253 (Toray Silicone) 1 Trichlorofluoromethane 15 Crude diphenylmethane diisocyanate 47 (Note) * Polypropylene glycol ether (abbreviation PPG, OH value 23-28) manufactured by Mitsui Toatsu. **Mitsui Toatsu, graft copolymer of 80% PPG and 20% acrylonitrile, OH value 28. Example 2 After applying a wax-based mold release agent to the inner surface of the heated upper and lower molds for meter hood molding (surface temperature 50°C), the core material was set at a predetermined position on the inner surface of the upper mold, and two-component curing type urethane was applied. Using an air spray gun, apply a mixed solution of 80 parts of polyol solution (solid content 62%) of paint (Mikuni Paint Polydur Primer No. 30), 10 parts of isocyanate hardener solution (solid content 60%), and 60 parts of thinner. , Apply the above mold release material to the inner surface of the mold, air dry for about 1 minute, and reduce the thickness to approx.
Forms a coating film of 30μ. The mold was closed, and the same semi-rigid urethane foam compound solution as in Example 1 was injected through the injection port and foamed and hardened. Open the mold and demold the integrally foamed product. The surface of the obtained molded product is washed with a rag containing thinner. A two-component reactive pattern paint containing urethane beads as the main ingredient (Rabi(S) Ocher TY; beige color) is applied to the surface of this meter hood, and the product is heated and dried at 80°C for 30 minutes to create a soft-touch anti-glare molded product. I got it. The thickness of the antiglare coating film in this case is 80μ. Example 3 After setting the polyvinyl chloride skin layer and core material, which had been previously molded into the external shape of an instrument panel by slush molding, into a predetermined position in a foam mold for molding an instrument panel, the mold was closed and the cavity was closed. An integrally foamed instrument panel molded product was formed by injecting the same semi-rigid polyurethane foam compounded solution as in Example 1 and foaming and curing.
OH (maroon color) was applied, and the coating was dried at 80°C for 30 minutes. In this case, the thickness of the anti-glare coating is approximately
It was 60μ. Table 1 shows the physical properties of the coating films obtained in Examples 1 to 3. 【table】

Claims (1)

[Claims] 1 Instrument panel molded products or instrument panel parts obtained by applying a two-component reactive urethane paint into the cavity of a foam mold for molding instrument panel products, and then injecting and foaming a semi-rigid urethane stock solution, or slush molding, vacuum forming, etc. A two-component reactive pattern paint containing spherical urethane beads as the main ingredient is applied to the surface of a molded product with a PVC skin created by a molding method or an instrument panel molded product or instrument panel part created by a resin injection molding method. A method for manufacturing an instrument panel that has a soft feel and anti-glare properties.