KR102581592B1 - Non-stick coaring composition and mold of automobile seat pad coated using the same - Google Patents

Abstract

The present invention relates to a non-stick coating composition comprising Fluorinated Ethylene Propylene (FEP) powder, silica oxide (SiO ₂ ) powder, glass fiber powder, and castor oil, and a coating composition coated using the same. As a mold for car seat pads, it facilitates demolding without using a mold release agent when manufacturing car seat pads, thereby reducing the generation of VOC and fine dust caused by the use of mold release agents, saving human resources, eliminating unnecessary processes, and shortening production time. It can provide effects such as improving product quality, improving the working environment, and reducing costs.

Description

Non-stick coating composition and mold for automobile seat pad coated using the same {Non-stick coating composition and mold of automobile seat pad coated using the same}

The present invention relates to a non-stick coating composition and a mold for automobile seat pads coated using the same. More specifically, a non-stick coating composition that facilitates demolding without using a mold release agent when manufacturing automobile seat pads using a mold, and a mold for automobile seat pads coated using the same. It relates to a mold for a car seat pad coated using.

Herein, background technology regarding the present disclosure is provided, and does not necessarily mean that it is well-known technology.

To provide comfort to passengers, car seats mainly use soft polyurethane foam, which has an open cell structure and provides low density, excellent resilience, air permeability, and damping characteristics. We manufacture products with various shapes of automobile seat pads using molds.

As shown in Figure 1, the manufacturing process of a conventional automobile seat pad consists of ① applying and drying a release agent on the inner surface of the upper mold (back) and lower mold (front) of the seat pad, and ② inserting subsidiary materials into the mold sprayed with the release agent. Inject raw materials. ③ After drying (hardening) for a certain period of time, the formed sheet pad is demolded from the mold and burrs on the inner and outer shapes are removed to shape the product (finishing process). ④ After removing external foreign substances and static electricity, apply wax to the back of the seat pad to remove squeaking noise and dry for more than 4 hours to complete the seat pad.

A mold release agent is a chemical that is applied to the inside of the mold in advance to make it easier to remove the product from the mold when making molded products. Silicone resin, polyvinyl alcohol, paraffin, waxes, Teflon dispersion (dispersed phase of polytetrafluoroethylene), etc. are used. It is becoming. The mold release agent used in molds for car seat pads made of polyurethane is mainly made of paraffin dissolved in solvent, an organic solvent.

When using a mold release agent, nitrogen compounds are created during the process and volatile organic compounds (VOCs) and fine dust are generated, which can cause industrial accidents. Therefore, protective equipment for workers and air pollution prevention facilities are required, and the interior of a finished vehicle is required. This will affect VOC content regulations. However, if a mold release agent is not used, demolding is not performed properly due to a lack of mold release force, making it a process to avoid, and there are many products that tear during demolding, which increases the defect rate.

In addition, due to the use of flammable release agents, there is a risk of explosion and fire due to static electricity in the sheet pad production line, so drying and removing static electricity are essential in the post-process. In addition, since the product is made in a high-temperature, dry mold, static electricity is generated during demolding, so a separate follow-up process is being carried out to remove this. However, because static electricity is not clearly removed, delays occur in the finishing process, reducing work efficiency, and fine dust and small foreign substances are fused to the product, deteriorating the quality of the finished product.

Meanwhile, the manufactured seat pad is combined with the seat frame to form a car seat, and talc and ash, which are residual solids of the petroleum-based (mineral oil) rust preventive oil (rolling oil, face oil) applied to the seat frame, are contained in the solvent of the release agent. Squeak noise is generated due to friction and collision with residual solids of the same type contained therein, causing important quality problems in finished vehicles. As an alternative to this squeaking noise, a method of applying an anti-noise wax such as paraffin or silicone to the back of the completed seat pad (attachment surface to the seat frame) has been used. In this case, about 4 hours of drying time is added, which increases the process. there is a problem.

The present invention seeks to provide a non-stick coating composition that facilitates demolding from a mold without using a release agent when manufacturing an automobile seat pad using a mold.

In addition, the present invention seeks to provide an antinoise wax composition that can significantly reduce squeal noise occurring between a car seat pad and a frame while simplifying the process by indirectly applying the antinoise wax composition to a mold.

In addition, the present invention seeks to provide a manufacturing process for an automobile seat pad that can omit the pretreatment process of applying a release agent to the mold and the posttreatment process of applying antinoise wax to the formed seat pad.

However, the objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the description below.

The present invention provides a mold for an automobile seat pad comprising Fluorinated Ethylene Propylene (FEP) powder, silica oxide (SiO ₂ ) powder, glass fiber powder, and castor oil. A non-stick coating composition is provided.

In addition, based on 100 parts by weight of the fluoroethylene propylene powder, 0.1 to 0.2 parts by weight of the silica powder, 0.1 to 0.2 parts by weight of the glass fiber powder, and 0.01 to 1.5 parts by weight of the castor oil are included.

In addition, the fluoroethylene propylene powder has a particle size of 20 μm to 35 μm, and the silica oxide powder is characterized in that it is a fine particle with a size of 0.1 to 1 μm.

In addition, the present invention is a mixture of Fluorinated Ethylene Propylene (FEP) powder, silica oxide (SiO ₂ ) powder, glass fiber powder, and castor oil, extruded into chips of 5 mm or less in size, and then wet-processed. A method for producing a non-stick coating composition is provided, characterized by freeze-grinding using a ball mill.

Additionally, the present invention provides a mold for automobile seat pad coated using the non-stick coating composition.

In addition, the mold for the automobile seat pad is characterized as being a mold made of aluminum.

The non-stick coating composition according to the present invention is coated on a mold for manufacturing automobile seat pads to facilitate demolding without using a mold release agent when manufacturing automobile seat pads, thereby reducing the generation of VOC and fine dust caused by the use of mold release agents, and reducing human It provides effects such as saving resources, eliminating unnecessary processes, shortening production time, improving product quality, improving the working environment, and reducing costs.

The antinoise wax composition according to the present invention can be indirectly applied to a mold for manufacturing automobile seat pads to significantly reduce squeal noise while simplifying the process, saving human resources, eliminating unnecessary processes, shortening production time, improving product quality, It provides effects such as improving the working environment and environmental pollution, and reducing costs.

In the present invention, the manufacturing process of the automobile seat pad can omit the pretreatment process of applying a release agent to the automobile seat pad mold using a non-stick coated mold, and is manufactured by indirectly applying the antinoise wax composition to the mold and adding raw materials. By doing so, the post-processing process can be omitted, providing effects such as saving human resources, eliminating unnecessary processes, shortening production time, improving product quality, improving the working environment and environmental pollution, and reducing costs.

Figure 1 shows a conventional automobile seat pad manufacturing process.
Figure 2 shows an image of the non-stick coating composition according to the present invention.
Figure 3 shows a mold onto which the antinoise wax composition according to the present invention is applied.
Figure 4 shows the automobile seat pad manufacturing process according to the present invention.

All technical and scientific terms used in this specification have the same meaning as generally understood by those skilled in the art, unless otherwise specified. Additionally, throughout this specification and claims, unless otherwise specified, the terms "comprise", "comprises", and "comprising" mean including the stated article, step or group of articles, and steps, and any other It is not used in the sense of excluding an object, step, or group of objects or group of steps.

Before describing the present invention in detail below, it is understood that the terms used in this specification are only for describing specific embodiments and are not intended to limit the scope of the present invention, which is limited only by the scope of the appended claims. shall.

Meanwhile, various embodiments of the present invention may be combined with any other embodiments unless clearly indicated to the contrary. Any feature indicated as being particularly preferred or advantageous may be combined with any other feature or feature indicated as being preferred or advantageous. Hereinafter, embodiments of the present invention and effects thereof will be described with reference to the attached drawings.

The manufacturing process of an automobile seat pad according to an embodiment of the present invention is a process of manufacturing an automobile seat pad using a mold coated with a non-stick coating composition, and includes pretreatment of applying a release agent to the automobile seat pad mold. The post-treatment process of applying antinoise wax to the process and formed sheet pad can be omitted.

More specifically, the manufacturing process includes preparing a non-stick coated mold (S1); Applying an antinoise wax composition to the prepared mold (S2); Forming a car seat pad by injecting raw materials into a mold to which the antinoise wax composition is applied, foaming, and drying (S3); and a step (S4) of demolding the formed automobile seat pad from the mold and finishing it to complete the automobile seat pad.

The step of preparing the non-stick coated mold (S1) is a step of preparing a mold coated with a non-stick coating composition, and a separate mold release agent may not be used, so the drying time required when applying a conventional mineral oil-based mold release agent (about 4 Productivity is improved by saving time), and when using a release agent, VOC and fine dust caused by nitrogen compounds in the atmosphere can be reduced, and the risk of fire in the work environment can be improved.

The non-stick coating composition includes Fluorinated Ethylene Propylene (FEP) powder, silica oxide (SiO ₂ ) powder, glass fiber powder, and castor oil. The non-stick coating composition is manufactured by mixing the above ingredients, extrusion process (300°C to 350°C) into rice grain-sized chips of 5 mm or less, and then freeze-grinding using a wet ball mill. More specifically, the ball mill filling rate is 30 to 50% of the ball volume, the balls are made of cemented carbide material with a size of 5 mm to 10 mm, and the grinding speed is 30 to 35 rpm for 180 to 200 minutes to adjust the particle size to 30 μm or less.

At this time, based on 100 parts by weight of fluoroethylene propylene powder, 0.1 to 0.2 parts by weight of the silica powder, 0.1 to 0.2 parts by weight of the glass fiber powder, and 0.01 to 1.5 parts by weight of the castor oil. Preferably, based on 100 parts by weight of fluoroethylene propylene powder, the silica oxide powder is contained in an amount of 0.1 to 0.15 parts by weight, the glass fiber powder is contained in an amount of 0.15 to 0.2 parts by weight, and the castor oil is contained in an amount of 0.01 to 1.3 parts by weight.

The fluoroethylenepropylene powder is the main component of the coating composition, provides hydrophobicity during coating, and has a particle size of 20 μm to 35 μm. The fluoroethylenepropylene powder has a melt flow rate of 0.8 to 29.0 g/10 min (preferably 8.1 to 29.0 g/10 min), a bulk density of 300 to 550 g/l, and a melting point. It is recommended to use one with a melting point of 255°C to 275°C.

The silica oxide powder acts as a binding enhancer, heat stabilizer, and heat aging enhancer, and is used as fine particles of 0.1 to 1 μm in size and with a high purity of 99.9% or more.

The glass fiber powder serves as a supplement to abrasion resistance by reinforcing strength, and glass fibers with an average fiber length of 50 μm to 300 μm are used, and are adjusted (pulverized) to 50 μm or less when manufacturing the composition.

The castor oil serves to lower the melting temperature during firing after surface application.

The mold is coated by applying the non-stick coating composition using an electrostatic powder coating method and then baking it at 350°C to 400°C for 230 to 250 minutes.

The mold is made of aluminum and is preferably anodized (anodized) to improve corrosion resistance and wear resistance. When using an anodized mold, the adhesive strength of the non-stick coating composition, which has no affinity unlike other paints, can be strengthened, the contact area with the non-stick coating composition can be increased, and the hardness of the aluminum mold surface can be improved to increase durability of repeated use. You can.

In addition, the mold includes an upper mold and a lower mold, so that the top and bottom shapes of the seat pad can be formed by joining them when manufacturing the seat pad. Since the non-stick coating composition according to the present invention is fired at a high temperature (350°C to 400°C) to coat the mold, it is recommended that the epoxy putty used for the molded surface have high heat resistance.

In the step (S2) of applying the antinoise wax composition to the prepared mold, the conventional direct application method of applying the antinoise wax to the sheet pad is changed to the indirect application method of applying the antinoise wax to the mold, resulting in noise defects due to non-application to the core area. It has been dramatically improved and provides the effect of realizing perfect quality. The antinoise wax composition according to the present invention has a short drying time of 90 to 120 seconds after application.

The applied antinoise wax composition is a composition that can be applied directly to a mold at high temperature (53 to 60°C), and can significantly reduce squeal noise.

The antinoise wax composition includes polypropylene emulsion, polyether polyol, refined alcohol, and a room temperature emulsifier. At this time, based on 100 parts by weight of the polypropylene emulsion, 20 to 30 parts by weight of the polyether polyol, 20 to 30 parts by weight of the refined alcohol, and 1 to 10 parts by weight of the room temperature emulsifier are included. Preferably, based on 100 parts by weight of the polypropylene emulsion, 23 to 27 parts by weight of the polyether polyol, 25 to 28 parts by weight of the refined alcohol, and 3 to 7 parts by weight of the room temperature emulsifier are included.

The antinoise wax composition is prepared by mixing the ingredients in the above amounts and emulsifying them with stirring at a speed of 3500 to 4000 cpm for 4 to 5 hours.

The polypropylene emulsion serves to adjust surface slip properties and increase friction coefficient, and may further include one or more additives among a drying accelerator, an anti-dye transfer agent, and a surface tension improver.

The polyether polyol serves as a lubricant that surrounds the carbon particles of ash and talc, which are residual solids of rust preventive oil applied to the seat frame.

The refined alcohol contains more than 95% ethanol by removing components other than ethanol, thereby widening the surface tension, improving volatility, and drying quickly.

The room temperature emulsifier is added to emulsify the ingredients.

The antinoise wax composition may be applied by spraying it onto the inner surface of the mold using a spray method. At this time, the amount of usage can be reduced by applying only to the mold (for example, upper mold) of the partial shape where the seat pad and the seat frame are joined.

The step (S3) of forming the car seat pad is a step of injecting raw materials into a mold to which the antinoise wax composition is applied, foaming, and drying. Injecting raw materials made of polyurethane into the mold, foaming, and drying (53) This is the step of forming the shape of the car seat pad by curing at ℃ to 60℃ for 8 to 10 minutes. If necessary, auxiliary materials can be inserted before injecting the raw materials to compensate for shapes that are difficult to form with a mold or shapes that are less durable.

The step of completing the car seat pad (S4) is a step of demolding and polishing the formed car seat pad from the mold, removing the dried car seat pad, removing burrs from the inner and outer shape, and repairing the car seat pad. This is the step of obtaining a completed car seat pad by curing at room temperature for 50 to 70 minutes after repair work (repairing surfaces damaged by work tools, etc. during the mold process). If necessary, a crushing (mechanical treatment to open closed cells on the surface) process may be further included after demolding.

Since the present invention does not have a release agent application process and does not use a flammable release agent, the static electricity removal process can be omitted as a post-process, and the drying process of about 4 hours after applying the conventional antinoise wax can be omitted. This provides effects such as saving human resources, eliminating unnecessary processes, shortening production time, improving product quality, improving the working environment and environmental pollution, and reducing costs.

Examples and Experimental Examples

(1) Measurement of release force and degree of damage during release of non-stick coated mold

The release force (removal load) and the number of sheets damaged (torn) during release were measured according to the non-stick coating according to the present invention and are shown in Tables 1 and 2 below. More specifically, it is a composition mixing 98.7% of FEP powder, 0.13% of silica oxide powder (99.9%), 0.17% of glass fiber powder, and 1% of castor oil, and is used on the inner surfaces of the upper mold (back of the seat pad) and lower mold (front of the seat pad). was coated (380°C, 4 hr firing), the same raw material (PU) was injected into the joined mold and cured under the same conditions, the load (kg) required for demolding was measured, and when 3,200 sheet pads were manufactured, the mold release The number of torn products was measured. The mold release agent was a conventional paraffin mold release agent.

division Coating X
Apply release agent O Coating O
Apply release agent X ₁ 29 19 X ₂ 34 22 X ₃ 31 18 X ₄ 30 20 X ₅ 29 19 average 30.6 19.6

division Coating X
Apply release agent O Coating O
Apply release agent Rips in the back and tears in the front. 17/3200 0/3200

As shown in Tables 1 and 2 above, the release force increased by about 35%, and tearing defects during release decreased by 100%.

(2) Squeak noise measurement according to application of antinoise wax composition

An antinoise wax composition containing 64% polypropylene emulsion, 16% lufuranol (BASF), 17% refined alcohol (Jinro), and 3% room temperature emulsifier was prepared and applied to the non-stick coated mold before injection of raw materials using the same method. The seat pad was completed. The average decibel (dB) generated when the manufactured seat pad was rubbed against the seat frame for 1 minute was measured and shown in Table 3 below.

division WAX application O Apply WAX X ₁ 25 59 X ₂ 29 60 X ₃ 24 54 X ₄ 26 55 X ₅ 25 52 average 25.8 56.0

As shown in Table 3, it can be seen that squeal noise was significantly reduced in the case of the sheet pad manufactured after applying the antinoise wax composition according to the present invention.

The features, structures, effects, etc. illustrated in each of the above-described embodiments can be combined or modified and implemented in other embodiments by a person with ordinary knowledge in the field to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

Claims (6)

Non-stick coating of mold for automobile seat pad, comprising Fluorinated Ethylene Propylene (FEP) powder, silica oxide (SiO ₂ ) powder, glass fiber powder, and castor oil. Composition.
According to paragraph 1,
Based on 100 parts by weight of the fluoroethylene propylene powder, an automobile seat pad comprising 0.1 to 0.2 parts by weight of the silica powder, 0.1 to 0.2 parts by weight of the glass fiber powder, and 0.01 to 1.5 parts by weight of the castor oil. Non-stick coating composition for molds.
According to paragraph 1,
The fluoroethylenepropylene powder has a particle size of 20μm to 35μm,
A non-stick coating composition for a mold for an automobile seat pad, wherein the silica oxide powder is fine particles with a size of 0.1 to 1 μm.
Fluorinated Ethylene Propylene (FEP) powder, silica oxide (SiO ₂ ) powder, glass fiber powder, and castor oil are mixed and extruded into chips of 5 mm or less in size using a wet ball mill. A method for producing a non-stick coating composition characterized by freeze-grinding.
A mold for automobile seat pad coated using the non-stick coating composition according to any one of claims 1 to 3.
According to clause 5,
A mold for a car seat pad, characterized in that the mold for the car seat pad is a mold made of aluminum.