KR100880468B1 - Matrix of Engine Hood for automobile and preparation thereof - Google Patents

Abstract

The present invention relates to an automobile engine hood molding base material and a method for manufacturing the same, and the molding base material can be provided by attaching a heat-resistant additive to a surface by applying heat-resistant additive to a polyester shoulder surface and bonding the needle punching nonwoven fabric to the surface. The present invention relates to an engine hood molding substrate for a motor vehicle and a method for manufacturing the same, which can be applied not only to the cold molding technique but also to the hot forming technique. The molding material according to the present invention exhibits excellent strength and formability and is excellent in sound absorption performance, so that it is suitable not only for automobile engine hoods but also for dash outers, and can improve environmental problems caused by using existing thermosetting resins.

Description

Automobile hood hood molding materials and manufacturing method {Matrix of Engine Hood for automobile and preparation etc}

The present invention relates to a molding material for an automotive engine hood, and more specifically, a low melting point polyester binder and a general polyester fiber are mixed at a predetermined weight ratio, and then a hot welding method is used to manufacture a hot melt cotton surface to withstand hot forming. The present invention relates to an engine hood molding substrate and a method of manufacturing the same, wherein the heat-resistant additive is applied to the surface of the engine hood.

In general, molding materials made of polyester are applied to hot forming, which is a method of maintaining a shape by directly applying heat to the molding material by installing an electric heater inside the mold or inside a press machine to attach the mold because the material is thermoplastic resin. Was difficult. In the case of polyester plush, when the heat is directly applied to the surface of the molding material through the heat mold, a problem occurs that the low melting point binder fiber inside the molding material sticks to the mold by recording, and the shape of the molding material is softened due to the heat of the thermoplastic resin. There is a problem that deformation occurs and defects occur. In the case of polyester molding materials, the cold molding method is used to preheat the molding materials through a separate preheating oven, and then molding them using a cooling mold in which a constant temperature is maintained by cooling water. Is mainly used.

However, the above-mentioned cold forming method requires a separate preheating oven and a mold, which makes it difficult to apply due to excessive investment costs. To solve these problems, binder fibers are used as thermosetting resins such as phenol resins, and weed or wood powder is used as reinforcing material. However, it also has side effects such as causing environmental problems of phenolic resin, so it is required to develop a suitable thermosetting resin.

In the previously applied tasil utility model, hot forming is possible by applying an additive to a polyester cotton surface, but this utility model is intended to improve the flame retardancy of an automobile, and is different from the contents to be claimed in the present invention. It may not be known in detail and may cause problems in drying and weight adjustment of the product in manufacturing, and the additive used also has a problem that commercialization is extremely difficult because the content component of the water-soluble polymer application modified silicone contains an unknown component.

Therefore, the present invention is to provide a new engine hood molding material that can solve all the problems of the prior art as described above as a technical problem. In other words, when a heat-resistant additive is applied to the polyester shoulder, it is found that the deformation after molding is prevented by preventing heat transfer to the inside of the material without sticking to the mold during hot forming, thereby improving the sound absorbing properties of existing molding materials. The present invention has been invented, which is a molding substrate having a good sound absorbing performance and excellent moldability and strength than conventional molding by cold forming.

Therefore, according to the present invention, in an automotive hood hood base material, in an automobile hood hood base material, a heat-resistant additive is fixed to a polyester shoulder surface, and a needle punched nonwoven fabric is laminated on at least one surface of the polyester heat resistant shoulder surface. An engine hood molding material for an automobile is provided, which is configured.

Further, according to the present invention, as a preferred method for manufacturing the above-described automotive engine hood molding material, at least one of the heat-resistant cotton obtained by applying a heat-resistant additive to the polyester cotton and heat-drying to produce a cotton wool to which the heat-resistant additive is fixed There is provided a method for manufacturing an engine hood molding material for an automobile, wherein a needle punched nonwoven fabric is laminated on a surface.

Hereinafter, the present invention will be described in more detail.

The engine hood molding material for automobiles of the present invention may be manufactured using a cotton wool prepared by mixing a low melting point polyester fiber and a high melting point polyester fiber in a predetermined ratio and then passing through an oven to perform heat fusion. In the present invention, by applying a heat-resistant additive to the silk surface and heat-drying, the heat-resistant additive is fixed to the surface of the polyester cotton surface, the heat-resistant additive is preferably used a liquid sodium silicate.                     

The sodium silicate is preferably prepared by dissolving a solid mixed with two solid materials of sodium oxide (Na₂O) and silicon dioxide (SiO₂) in a ratio of 1: 2 to 1: 4 in water.

In the present invention, it is preferable to set the amount of the heat-resistant additive to 10 to 40 wt% based on the weight of the molding substrate in terms of moldability and cost of the product. If the amount of the heat-resistant additive is greater than 40 wt%, the weight of the plush product must be lowered.

In the present invention, the method of imparting the heat-resistant additive to the polyester cotton surface impart a liquid heat-resistant additive to the upper and lower surfaces of the rotating roller and supplying the surface between the rollers to impart a heat-resistant additive to the surface of the shoulder surface by the rotation of the roller It is preferable that the rotational speed of the roller is constantly adjusted to be supplied by a predetermined amount. If the rotational speed of the roller is too fast, the amount of the heat-resistant additive is increased to increase the weight of the base material after production. On the contrary, if the rotational speed is too slow, the amount of the heat-resistant additive is lowered and the heat-resistance effect is lowered during thermoforming.

In addition, the method of imparting a heat-resistant additive in the present invention may impart a heat-resistant additive to the surface of the plush surface by impregnating the plush in the heat-resistant additive solution, in addition to the above-mentioned method of applying the roller. Even though the addition of heat-resistant additives will be made even more difficult to control the amount of heat-resistant additives.                     

The plush imparted on the surface of the heat additive is heated and dried, whereby the water in the heat additive additive solution is evaporated to dry and the sodium silicate adheres to the plush surface. By incorporating a non-woven fabric containing a predetermined low melting point polyester fiber on at least one surface of the dried cotton by the drying step, an engine hood molding material for automobiles according to the present invention which can be treated by hot forming can be produced.

In the following examples and comparative examples can be given a non-limiting example of a method for producing a molding substrate that can be processed by hot molding by applying a heat-resistant additive to the surface of the polyester shoulder.

 Example 1

 The low melting point polyester fiber and the high melting point polyester fiber are added to a plush manufacturing facility and mixed, and the web is formed through a carding machine, and then the web is laminated through a molding machine. The laminated web passes through a heat oven of 140 ° C. to 160 ° C., and the low melting point polyester fiber is melted to cause fusion bonding with the high melting point polyester fiber. The melt-bonded plush is then passed through a rotating roller to which a heat-resistant additive is applied, and the sodium silicate is imparted as a heat-resistant additive to the surface of the shoulder by the rotating roller. The heat resistant additive was adjusted to be 20wt% of the total weight of the silk noodles after heat drying. After passing through the dryer, the surface water is evaporated and sodium silicate is fixed. Finally, a needle punched nonwoven fabric containing a predetermined low melting point polyester fiber is combined on one surface of the heat resistant cotton. The molding material thus prepared was put into a thermoforming machine and molded, and the molded parts were taken from the same part to measure molding state and physical properties.

EXAMPLES 2-4

 The same procedure as in Example 1 was conducted except that the throughput of the sodium silicate was adjusted to 10 wt%, 30 wt%, and 40 wt%.

[Examples 5 to 8]

The ratio of water and sodium silicate was 60:40, except that the throughput was adjusted to 20wt%, 10wt%, 30wt%, 40wt% and was the same as in Example 1.

EXAMPLES 9-12

Same as Example 1 except for adjusting the throughput to 20wt%, 10wt%, 30wt%, 40wt% through the impregnating method of the heat-resistant additive in which the ratio of water and sodium silicate was adjusted to 50:50. It was made.

Comparative Example 1

 The same procedure as in Example 1 was conducted except that no sodium silicate was provided.

Comparative Example 2

 Sodium silicate was not imparted, and the molding method was the same as in Example 1 except that the product was preheated using a separate preheating oven (temperature condition: 240 ° C.) and subjected to cold molding using a cooling mold.

After the molded article was manufactured using a mold for an engine hood, the obtained product was measured and evaluated by the following method: product properties (absorption and heat resistance), strength and moldability after molding.

* Input amount (wt%): It is a percentage value of the input amount with respect to the total weight of the product after drying.

* Absorption rate: Vertical incidence absorption rate using in-house test device

         This is a value measured by collecting the volume.

       * Heat resistance: It is the rate of change of the dimension (thickness) before and after being put into the oven (110 ℃ × 3Hr).

         The higher the value is, the worse it is, and the good standard is set to less than 1% of the dimension before input.

       * Forming: Molding thickness and overall molding by part compared to drawing dimension after molding

         State.

* Strength: Refers to the flexural strength of the product.

division Heat-resistant additive  Molding conditions Composition Ratio [Water: Sodium Silicate (wt%)] Input amount (wt%) Processing method system Product weight (g / ㎡) Mold temperature (℃) Molding time (seconds) Example 1 50:50 20 roller Hot 1200 140 40 Example 2 50:50 10 roller Hot 1200 140 40 Example 3 50:50 30 roller Hot 1200 140 40 Example 4 50:50 40 roller Hot 1200 140 40 Example 5 60:40 20 roller Hot 1200 140 40 Example 6 60:40 10 roller Hot 1200 140 40 Example 7 60:40 30 roller Hot 1200 140 40 Example 8 60:40 40 roller Hot 1200 140 40 Example 9 50:50 20 Impregnation Hot 1200 140 40 Example 10 50:50 10 Impregnation Hot 1200 140 40 Example 11 50:50 30 Impregnation Hot 1200 140 40 Example 12 50:50 40 Impregnation Hot 1200 140 40 Comparative Example 1 0 0 roller Hot 1200 140 40 Comparative Example 2 0 0 roller Cold 1200 Room temperature 40

division Molding result  Properties Formability burglar  Sound Absorption (NRC) Heat resistance (% change in dimension) Example 1 Good Good 0.37 0.8 Example 2 Good Good 0.35 1.0 Example 3 Good Good 0.38 0.7 Example 4 Good Good 0.28 0.8 Example 5 Good Good 0.36 0.6 Example 6 Good Good 0.33 0.9 Example 7 Good Good 0.37 0.8 Example 8 Good Good 0.36 0.8 Example 9 Good Good 0.38 0.7 Example 10 Good Good 0.40 0.6 Example 11 Good Good 0.37 0.8 Example 12 Good Good 0.38 0.9 Comparative Example 1 Poor (deformation) Inadequate 0.21 7.0 Comparative Example 2 Good Inadequate 0.19 12.0

As described above, according to the present invention, the moldability and surface flexural strength of the molding material are remarkably improved by the existing hot forming, and the molding material with improved physical properties, especially the sound absorption performance, can be manufactured than when the cooling mold is used. There is an advantage that can reduce the additional investment costs due to the change of equipment to cold forming.

Claims (5)

In the manufacturing method of the engine hood molding material for automobiles, After imparting a heat-resistant additive to the polyester plush to 10 to 40wt% of the weight of the molded base material after drying and heat-drying to produce a plush to which the heat-resistant additive is fixed, the needle punched nonwoven fabric is incorporated on at least one side of the obtained heat-resistant plush. A method of manufacturing an engine hood molding material for an automobile. The method of claim 1, A method of manufacturing an engine hood molding material for an automobile, characterized by providing a heat-resistant additive to the shoulder surface by a roller coating method. The method of claim 1, A method for manufacturing an engine hood molding material for an automobile, comprising imparting a heat-resistant additive to the shoulder by impregnation. delete In the engine hood molding material for automobiles, An engine hood molding material for automobiles, characterized in that the heat-resistant additive is fixed to 10 to 40wt% of the weight of the molded base material after drying, and the needle punched nonwoven fabric is laminated to at least one side of the polyester heat-resistant cotton. .