KR20210146494A - Composite material for automobile engine cover and engine underfloor and its manufacturing method - Google Patents

Abstract

The present invention relates to a composite material for an automobile engine cover or engine underfloor and a method of manufacturing the same. The composite material formed by laminating the first and second base layers and bonding the microfiber sound-absorbing layer to the molded body formed by pressure press, wherein the first base layer is a non-woven fabric composed of a skin layer of PET fabric, a PET fiber, a LM or RM fiber, and a polyolefin fiber, and the second base layer a nonwoven fabric composed of a glass fiber, a PP fiber, and a polyolefin fiber. The composite material for an automobile engine cover or engine underfloor according to the present invention is manufactured based on a microfiber fiber material having sound-absorbing and sound-insulating properties, thereby reducing the weight of the car body and improving the fuel efficiency reduction effect thereof, and has sound-absorbing and sound-insulating performance equal to or higher than that of existing products.

Description

Composite material for automobile engine cover and engine underfloor and its manufacturing method

The present invention relates to a composite material for an automobile engine cover or engine underfloor and a manufacturing method thereof, and more particularly, to an automobile engine cover or engine underfloor composite material with improved vehicle quietness, eco-friendly, and fuel efficiency, and a manufacturing method thereof am.

Among the new technologies related to automobiles, the development of telematics devices and voice recognition devices requires quieter indoor noise levels, so it is necessary to develop sound-absorbing parts with improved performance. one of them

In addition, the weight reduction of automobiles is coupled with research to develop parts that generate noise and vibration in automobiles as improved sound-absorbing materials. Research to change it to dragon fiber is attracting attention.

Automobile engine cover and engine underfloor It is used for the purpose of blocking or reducing noise generated by the engine while keeping the interior of the engine room beautiful. is the trend

As a prior art in relation to automobile engine covers and engine underfloors, for example, in Patent Document 1, a high-strength material made of polypropylene and glass fiber is preheated and cooled and molded, and the microfiber absorbent with excellent heat resistance on the lower side of the G/F After heat-sealing and fixing the vehicle material, the foam boss made of urethane rigid foam insert injection molding the insulator rubber fixed to the engine under the microfiber absorber material to form a composite material. In Document 2, the skin layer (1) is a high heat-resistant polyethylene terephthalate film or fabric, the anti-distortion layer (2) and the anti-distortion layer (6) are spunbond long fiber nonwoven fabric (T1), and a reinforcing sound-absorbing layer (3) and a reinforcing sound-absorbing layer (5) is a high-strength needle short-fiber nonwoven fabric (T2) composed of RM fiber, LM fiber, or polyethylene terephthalate fiber, the central layer 4 is a fabric, and the back layer 7 is a high heat-resistant PET film and its outer surface Disclosed is an engine cover for a vehicle having a multi-layer structure in which urethane foam is formed.

In addition, in Patent Document 3, polyurethane made of MDI and POL (POLYOL) and graphite are mixed to form a V-O (VERTICAL ZERO, vertical combustion) class flame-retardant integrated engine cover and its A manufacturing method is disclosed.

The above-mentioned prior art employs a urethane foam sound absorbing material and has the advantage that excellent sound absorption performance can be expected. There are problems such as crumbling, and there are also disadvantages such as increase in design and equipment cost, and cost due to manufacturing process and defective rate.

The inventor of the present application manufactured the engine cover based on a fiber material having sound absorption and sound absorption properties to improve the effect of lightening the vehicle body and reducing fuel efficiency, and confirmed that it exhibits equivalent or higher sound absorption and insulation performance compared to existing products. completed.

KR 10-1717622 B KR 10-2018642 B KR 10-2094731 B

The problem to be solved in the present invention relates to the provision of a composite material for an automobile engine cover or engine underfloor and a manufacturing method thereof, and more particularly, the engine cover or engine underfloor material is based on a microfiber fiber material having sound absorption and sound insulation properties. The purpose of the present invention is to provide a composite material and a method for manufacturing a composite material that improve the weight reduction of the car body and the fuel efficiency reduction effect by replacing it with the existing product, and exhibit the same or better sound absorption and sound absorption performance compared to existing products.

As a means of solving the problem according to the present invention, a composite material for an automobile engine cover or engine underfloor is combined with a microfiber sound-absorbing layer consisting of a laminate to a molded body (S) in which a skin layer, a bonding layer, a first base layer and a second base layer are laminated. or a structure in which a microfiber sound-absorbing layer made of a laminate is combined with the molded body (S) in which the skin layer, the bonding layer, the first base layer, the film layer, and the second base layer are laminated.

One embodiment according to the composite material for an automobile engine cover or engine underfloor of the present invention is composed of a skin layer (1) made of a water-repellent and oil-repellent coated PET fabric, a hot melt bonding layer (B), PET fibers and LM or RM fibers A first base layer (2a) made of a non-woven fabric or non-woven fabric made of PET fiber, LM or RM fiber, and polyolefin fiber, and a second base layer (2b) made of a non-woven fabric made of glass fiber, PP fiber, and polyolefin fiber On this laminated molded body (S), a 1.5 to 2 denier PET microfiber non-woven fabric layer (3a), a melt blow non-woven fabric layer (3b) composed of 1.5 to 2 denier PP microfiber and 1.5 to 2 denier PET microfiber, and 1.5 to 2 The PET microfiber nonwoven fabric layer 3c of denier is sequentially bonded to form a structure in which the microfiber sound absorbing layer 3 made of a laminate is combined.

In another embodiment according to the composite material for an automobile engine cover or engine underfloor of the present invention, an epidermis layer (1) made of a water-repellent and oil-repellent coated PET fabric, a hot melt bonding layer (B), PET fibers and LM or RM fibers The first base layer (2a), PP film layer (F), glass fiber, PP fiber, and polyolefin fiber composed of a nonwoven fabric composed of Melt composed of a 1.5 to 2 denier PET microfiber nonwoven fabric layer (3a), 1.5 to 2 denier PP microfiber and 1.5 to 2 denier PET microfiber on a molded body (S) on which a second base layer (2b) made of a non-woven fabric is laminated The blow nonwoven fabric layer (3b) and the PET microfiber nonwoven fabric layer (3c) of 1.5 to 2 denier are sequentially combined to form a structure in which the microfiber sound absorbing layer 3 made of a laminate is combined.

And as a means of solving another problem of the present invention, a method of manufacturing a composite material for an automobile engine cover or engine underfloor is a). Outer layer (1) made of water-repellent and oil-repellent coated PET fabric, urethane hot melt bonding layer (B), non-woven fabric made of PET fiber and LM or RM fiber, or PET fiber, LM or RM fiber, and polyolefin fiber A first step of preparing a first base layer (2a) made of a nonwoven fabric, a second base layer (2b) made of a nonwoven fabric made of glass fiber, PP fiber, and polyolefin fiber, b). A PET microfiber nonwoven fabric layer of 1.5 to 2 denier (3a), a melt blow nonwoven fabric layer (3b) composed of PP microfibers of 1.5 to 2 denier and PET microfibers of 1.5 to 2 denier, and a PET microfiber nonwoven layer of 1.5 to 2 denier (3c). ) by sequentially stacking, and combining the outer edges with a sewing ice method or an ultrasonic welding method to prepare a microfiber sound-absorbing layer (3), c). The first base layer (2a) and the second base layer (2b) of the first step are laminated by needle punching, and the urethane hot melt bonding layer (B) and the skin layer (1) are laminated to the first base layer (2a) side, A third step and d) of manufacturing a molded body (S) by molding by a pressure press. Laminating the microfiber sound-absorbing layer 3 toward the second base layer of the molded body (S), and combining the microfiber sound-absorbing layer (3) by an ultrasonic welding method comprising a fourth step of manufacturing the composite material (P).

One embodiment according to the method for manufacturing a composite material for an automobile engine cover or engine underfloor of the present invention is a). Outer layer (1) made of water-repellent and oil-repellent coated PET fabric, urethane hot melt bonding layer (B), non-woven fabric made of PET fiber and LM or RM fiber, or PET fiber, LM or RM fiber, and polyolefin fiber A first step of preparing a first base layer (2a) made of a nonwoven fabric, a second base layer (2b) made of a nonwoven fabric made of glass fiber, PP fiber, and polyolefin fiber, b). A layer of 1.5 to 2 denier PE T microfiber nonwoven fabric (3a), a melt blow nonwoven layer (3b) composed of 1.5 to 2 denier PP microfiber and 1.5 to 2 denier PET microfiber, and a 1.5 to 2 denier PET microfiber nonwoven layer ( A second step of manufacturing the microfiber sound-absorbing layer 3 by sequentially stacking 3c), and bonding the outer edges by a sewing ice method or an ultrasonic welding method, c). The first base layer and the second base layer of the first step are combined by a gas laminating method through a PP film, and then laminated by needle punching, and a urethane hot melt bonding layer (B) toward the first base layer (2a) and A third step and d) of laminating the skin layer (1) and forming the molded body (S) by pressing. and a fourth step of laminating the microfiber sound-absorbing layer 3 toward the second base layer of the molded body S and combining the microfiber sound-absorbing layer 3 by ultrasonic fusion to prepare a composite material (P).

The composite material for an automobile engine cover or engine underfloor according to the present invention is composed of 20 to 60 parts by weight of PET fiber and 20 to 80 parts by weight of LM or RM fiber with an areal density of 400 to 1,000 g/ A nonwoven fabric layer having an areal density of 400 to 1,000 g/m 2 and a nonwoven fabric layer comprising 20 to 60 parts by weight of a nonwoven fabric layer or PET fiber, 20 to 80 parts by weight of LM or RM fiber, and 20 to 40 parts by weight of a polyolefin fiber, and the second base layer (2b) ) as the material of glass fiber (glass fiber) 20-50 parts by weight, PP fiber 20-60 parts by weight, and polyolefin fiber 20-40 parts by weight, a nonwoven fabric layer with an areal density of 400 to 1,000 g/m 2 is adopted, and the first base layer One of the characteristics of the present invention is to improve the distortion and peeling of the engine cover by bonding (1a) and the skin layer (1) through a urethane hot melt film having excellent heat resistance and adhesion.

In addition, the composite material for an automobile engine cover or engine underfloor according to the present invention includes a 1.5 to 2 denier PET microfiber nonwoven layer (3a), 40 to 60 parts by weight of a 1.5 to 2 denier PP microfiber, and 40 to 40 parts by weight of a 1.5 to 2 denier PET microfiber. Melt blow nonwoven fabric layer (3b) composed of ~ 60 parts by weight and PET microfiber nonwoven fabric layer (3c) of 1.5 to 2 denier are sequentially laminated, and the outer edge is combined by stitching ice method or ultrasonic fusion method to form a microfiber sound absorbing layer (3). It is also one of the characteristics of the present invention to reduce the weight of the vehicle body and improve the fuel efficiency reduction effect by adopting it, and to improve the sound absorption/insulation performance equivalent to or higher than that of the existing product.

The composite material for an automobile engine cover or engine underfloor according to the present invention has light absorption and sound absorption characteristics and is replaced with a lightweight microfiber fiber material to improve the weight reduction of the vehicle body and thus the fuel efficiency reduction effect, and is equivalent to or equivalent to that of existing products It exhibits the above sound absorption/insulation performance and has the effect of improving the distortion and peeling of the engine cover.

1 A) and B) are views schematically showing the structure of a composite material for an automobile engine cover or engine underfloor according to the present invention;
2 is a product photograph of a composite material for an automobile engine cover or engine underfloor according to the present invention;

Hereinafter, the present invention will be described in more detail with reference to specific contents and <Examples> and <Test Examples> for carrying out the present invention, but the present invention is not limited by the contents and examples described below.

The accompanying drawings 1 A) and B) are diagrams schematically showing the structure of a composite material for an engine cover or engine underfloor according to the present invention.

The composite material (P) for an automobile engine cover or engine underfloor of the present invention is a skin layer (1) made of a water-repellent and oil-repellent coated PET fabric, a urethane hot melt bonding layer (B), a first base layer (2a), a second base material It consists of a structure in which the microfiber sound-absorbing layer 3 made of a laminate is combined with the molded body S made of the layer 2b, and the first base layer 2a and the second base layer 2b are combined with a PP film. It consists of a structure in which the microfiber sound-absorbing layer 3 made of a laminate is combined with the molded body (S).

More specifically, the composite material (P) for an automobile engine cover or engine underfloor of the present invention is a skin layer (1) made of a water-repellent and oil-repellent coated PET fabric, a hot melt bonding layer (B), PET fiber and LM or RM A first base layer (2a) made of a non-woven fabric composed of fibers, or a non-woven fabric composed of PET fibers, LM or RM fibers, and polyolefin fibers, and a second substrate composed of a non-woven fabric composed of glass fibers, PP fibers and polyolefin fibers The layer (2b) is laminated and composed of a 1.5 to 2 denier PET microfiber nonwoven fabric layer (3a), 1.5 to 2 denier PP microfiber and 1.5 to 2 denier PET microfiber on the molded body (S) molded by pressure press. The melt blow nonwoven fabric layer (3b) and the PET microfiber nonwoven fabric layer (3c) of 1.5 to 2 denier are sequentially combined to form a structure in which the microfiber sound absorbing layer 3 made of a laminate is combined.

The skin layer 1 according to the present invention is made of polyethylene terephthalate (PET) fabric with an areal density of 160 to 300 g/m2 coated with water and oil repellency, and is located at the outermost part of a composite material for an engine cover or engine underfloor, and its surface It is coated with water and oil repellency to protect the cover from moisture and oil generated in the engine room.

The urethane hot melt bonding layer (B) according to the present invention is an adhesive bonding the skin layer (1) and the first base layer (2a), and the bonding layer (B) is 25 to 100 g of a urethane hot melt material by a spray method. It is prepared on a film having an areal density of /m 2 .

The urethane hot melt has high heat resistance and excellent adhesion, so it is effective in suppressing peeling of the skin layer 1 from the first base layer 2a, and has an effect of improving the occurrence of warpage of the composite material.

The first base layer (2a) according to the present invention is a main base layer that maintains the physical properties and shape of the composite material together with the second base layer (2b), and the first base layer (2a) is a PET fiber and LM Alternatively, it is made of a non-woven fabric composed of RM fibers, or a non-woven fabric composed of PET fibers, LM or RM fibers, and polyolefin fibers.

The first base layer (2a) is made of a nonwoven fabric having an areal density of 400 to 1,000 g/m 2 composed of 20 to 60 parts by weight of PET fibers and 20 to 80 parts by weight of LM or RM fibers, or 20 to 60 parts by weight of PET fibers and LM Alternatively, it is composed of a nonwoven fabric having an areal density of 400 to 1,000 g/m 2 composed of 20 to 80 parts by weight of RM fibers and 20 to 40 parts by weight of polyolefin fibers.

As the polyolefin fiber, polypropylene fiber for non-woven fabric, polyethylene fiber, etc. are known, and the LM or RM fiber is a low meling PET fiber or a rapid meling PET fiber.

The second base layer (2b) according to the present invention is made of a nonwoven fabric having an areal density of 400 to 1,000 g/m 2 composed of 20 to 50 parts by weight of glass fiber, 20 to 60 parts by weight of polypropylene fiber, and 20 to 40 parts by weight of polyolefin fiber. .

The coarse second base layer 2b is joined together with the first base layer 2a by needle punching, and another bonding method is the second base layer 2b and the first base layer 2a. ) with a polypropylene (PP) film interposed therebetween by gas laminating method.

The microfiber sound-absorbing layer (3) according to the present invention is bonded to the second base layer (2b) side of the molded body (S) by an ultrasonic welding method, specifically, the epidermis layer (1), the urethane hot melt bonding layer (B), the first The first base layer (2a) and the second base layer (2b) are laminated, and the microfiber sound-absorbing layer (3) is bonded to the second base layer (2b) side of the molded body (S) molded by pressure press by ultrasonic fusion method. made to become

The microfiber sound-absorbing layer (3) is a laminate in which the PET microfiber non-woven fabric layer (3a), the Melt blow non-woven fabric layer (3b) and the PET microfiber non-woven fabric layer (3c) are laminated, and the outer edge is bonded by a sewing method or an ultrasonic welding method. It consists of absorbing noise generated from the engine in contact with the engine side.

The microfiber sound-absorbing layer (3) is a 1.5 to 2 denier PET microfiber non-woven fabric layer (3a), 1.5 to 2 denier PP microfiber 40 to 60 parts by weight, and 1.5 to 2 denier PET microfiber 40 to 60 parts by weight. It consists of a nonwoven fabric layer (3b) and a PET microfiber nonwoven fabric layer (3c) of 1.5 to 2 denier, and the PET microfiber nonwoven fabric layer (3a) and the PET microfiber nonwoven fabric layer (3c) are the epidermal layer surrounding the Melt blow nonwoven fabric layer (3b). function of

In the microfiber sound-absorbing layer (3), the PET microfiber nonwoven layer (3a) and the PET microfiber nonwoven fabric layer (3b) are each a nonwoven layer having an areal density of 100 to 300 g/m2, and the melt blow nonwoven fabric layer (3b) is made of PP microfiber and PET microfiber. It consists of an areal density of 100 ~ 300g/m2 in which the web is formed by the melt blow method so that the composition is the same in the weight ratio.

And as a means of solving another problem of the present invention, a method of manufacturing a composite material for an automobile engine cover or engine underfloor is a). Outer layer (1) made of water-repellent and oil-repellent coated PET fabric, urethane hot melt bonding layer (B), non-woven fabric made of PET fiber and LM or RM fiber, or PET fiber, LM or RM fiber, and polyolefin fiber A first step, b) of preparing a first base layer (2a) made of a nonwoven fabric, and a second base layer (2b) made of a nonwoven fabric made of a glass fiber, PP fiber, and polyolefin fiber. A PET microfiber nonwoven fabric layer of 1.5 to 2 denier (3a), a melt blow nonwoven fabric layer (3b) composed of PP microfibers of 1.5 to 2 denier and PET microfibers of 1.5 to 2 denier, and a PET microfiber nonwoven layer of 1.5 to 2 denier (3c). ) by sequentially stacking and combining the outer edges with a sewing method or ultrasonic fusion method to prepare a microfiber sound-absorbing layer (3), c). The first base layer (2a) and the second base layer (2b) of the first step are laminated by needle punching, and the urethane hot melt bonding layer (B) and the skin layer (1) are laminated to the first base layer (2a) side, A third step and d) of manufacturing a molded body (S) by molding by a pressure press. It consists of laminating the microfiber sound absorbing layer 3 toward the second base layer 2b of the molded body (S) and combining the microfiber sound-absorbing layer 3 by ultrasonic fusion to prepare a composite material (P).

The first step according to the present invention is a step of preparing a material constituting the skin layer (1) of the composite material, the urethane hot melt bonding layer (B), the first base layer (2a), and the second base layer (2b), The skin layer (1) is made of a polyethylene terephthalate (PET) fabric with an areal density of 160 to 300 g/m 2 coated with water and oil repellency, and the urethane hot melt bonding layer (B) is a film having an areal density of 25 to 100 g/m 2 by spraying. manufactured on top

The first base layer (2a) is made of a nonwoven fabric having an areal density of 400 to 1,000 g/m 2 composed of 20 to 60 parts by weight of PET fibers and 20 to 80 parts by weight of LM or RM fibers, or 20 to 60 parts by weight of PET fibers and LM Or 20 to 80 parts by weight of RM fibers and 20 to 40 parts by weight of polyolefin fibers are composed of a nonwoven fabric having an areal density of 400 to 1,000 g/m2, and the LM or RM fibers are Low meling PET fibers or Rapid meling PET fibers.

The second base layer (2b) is composed of a nonwoven fabric having an areal density of 400 to 1,000 g/m 2 composed of 20 to 50 parts by weight of glass fiber, 20 to 60 parts by weight of polypropylene fiber, and 20 to 40 parts by weight of polyolefin fiber.

The second step according to the present invention is a step of manufacturing a microfiber sound-absorbing layer 3 made of a laminate, a PET microfiber nonwoven layer 3a of 1.5 to 2 denier, 40 to 60 parts by weight of a PP microfiber of 1.5 to 2 denier, and Melt blow nonwoven fabric layer (3b) composed of 1.5 to 2 denier PET microfiber 40 to 60 parts by weight and 1.5 to 2 denier PET microfiber nonwoven fabric layer (3c) are sequentially laminated and the outer edge is combined by sewing method or ultrasonic welding method. A microfiber sound-absorbing layer 3 made of a laminate is manufactured.

The PET microfiber non-woven fabric layer (3a) and the PET microfiber non-woven fabric layer (3b) are non-woven fabric layers having an areal density of 100 to 300 g/m2, respectively, and the melt blow non-woven fabric layer (3b) is composed of PP microfiber and PET microfiber in the same weight in weight ratio. It consists of an areal density of 100 ~ 300g/㎡ formed by a melt blow method.

The microfiber sound-absorbing layer (3) is made to absorb noise generated by the engine in contact with the engine side, and the PET microfiber nonwoven fabric layer (3a), the melt blow nonwoven fabric layer (3b) and the PET microfiber nonwoven fabric layer (3c) are combined. In the laminate, the nonwoven fabric layer 3a and the nonwoven fabric layer 3c function as a skin material for the microfiber sound absorbing layer 3 .

The third step according to the present invention is a step of manufacturing a molded body (S) by combining the first base layer (2a), the second base layer (2b) and the skin layer (1), and the molded body (S) is the first The first base layer (2a) and the second base layer (2b) are combined by needle punching, and then the urethane hot melt bonding layer (B) and the skin layer (1) are laminated and molded by pressure press to produce a molded body (S). is done

The bonding method of the first base layer (2a) and the second base layer (2b) is to interpose an additional PP film between the first base layer (2a) and the second base layer (2b) and laminate it by a gas lamination method and then joining by needle punching.

The fourth step according to the present invention is to combine the microfiber sound-absorbing layer 3 toward the second base layer 2b of the molded body S by ultrasonic fusion to combine the composite material for an automobile engine cover or engine underfloor of the present invention. (P) consists of manufacturing

<Example>

According to the manufacturing method of the present invention according to the composition and ratio of each layer shown in Table 1 below, the skin layer (1), the urethane hot melt bonding layer (B), the first base layer (2a) and the second base layer (2b) was laminated, heated at a temperature of 170° C. for 3 minutes, and then cold compression molded at room temperature at a pressure of 150 kg/cm 2 using a front wheel molding machine, without removing the upper and lower molds, cold compression molding for 3 minutes and then demolding to produce a molded body (S).

Thereafter, the composite material (P) was prepared by bonding the laminate as the microfiber sound-absorbing layer (3) separately prepared on the back surface of the molded body (S) prepared above by ultrasonic welding.

An engine cover was finally manufactured using the composite material (P) as a material, and the weight of the manufactured engine cover was 736 g.

division Composition and proportion (parts by weight) Areal density (g/m2) molded body epidermal layer PET fabric with water-repellent/oil-repellent coating 160 bonding layer Urethane hot melt 50 1st base layer nonwoven fabric PET fiber 60 parts by weight, LM fiber 40 parts by weight
20 parts by weight of polypropylene fiber 800 2nd base layer nonwoven fabric 40 parts by weight of glass fiber, 60 parts by weight of PP fiber
20 parts by weight of polypropylene fiber 900 Microfiber sound-absorbing layer PET nonwoven layer 2 denier PET fiber 150 Melt blow
non-woven fabric layer 50 parts by weight of 2 denier PP fiber
50 parts by weight of 2 denier PET fiber 200 PET nonwoven layer 2 denier PET fiber 200

<Test Example>

The physical properties of the engine cover manufactured in <Example 1> were tested, and the results are shown in [Table 2] below.

Test Items unit Example existing product Assessment Methods engine cover
write flexural strength N MD:25
CD:25 MD:15
CD:15 ISO 178 flexural modulus MPa MD:400
CD:400 MD:250
CD:250 ISO 178 moisture absorption % 10 10 MS 361-15 chemical resistance - clear clear MS 310-05 flame retardant mm/min 68 65 MS 300-08 engine cover
sound absorbing material absorption rate 400Hz - 0.29 0.25 D49 1977 1 kHz 0.70 0.67 D49 1977 2kHz 0.76 0.75 D49 1977 tensile strength kgf 37 30 MS 343-11 elongation % 35 31 MS 343-11 Assy status peel strength ibs/inch 0.72 0.68 ASTM D 4851 environmental vibration test - Crack/Peeling: Nothing Crack/Peeling: Nothing MS 211-60 weight reduction rate comparative preparation 0.736kg 1008 kg 27% lighter

As shown in [Table 2], the physical properties according to the strength, sound absorption rate, etc. of the engine cover material (molded body) and the engine cover sound-absorbing material (microfiber sound-absorbing layer) of the present invention are improved compared to existing products, and weight reduction (27% weight reduction) is also improved From this, it can be predicted that the engine cover and engine underfloor products made of the composite material of the present invention will improve the fuel efficiency reduction effect by reducing the weight of the vehicle body and exhibit the same or better sound absorption/insulation performance compared to the existing products. I would say there is

Claims (6)

(i). The epidermis layer (1) made of PET fabric coated with water and oil repellency and has an areal density of 160 to 300 g/m2;
(ii). Urethane hot melt bonding layer (B) with an areal density of 25 to 100 g/m2,
(iii). A first base layer (2a) consisting of a non-woven fabric composed of PET fibers and LM or RM fibers, or a non-woven fabric composed of PET fibers, LM or RM fibers, and polyolefin fibers, and
(iv). A second base layer (2b) made of a nonwoven fabric composed of glass fiber, PP fiber, and polyolefin fiber is laminated on the molded body (S) formed by pressure press,
(v). A PET microfiber nonwoven layer of 1.5 to 2 denier (3a), a melt blow nonwoven layer (3b) composed of 1.5 to 2 denier PP microfiber and 1.5 to 2 denier PET microfiber in the same weight ratio, and 1.5 to 2 denier PET A composite material for an automobile engine cover or engine underfloor, characterized in that it has a structure in which a microfiber sound-absorbing layer (3) made of a laminate in which the microfiber nonwoven layer (3c) is laminated and bonded. The method according to claim 1, wherein the first base layer (2a) is made of a nonwoven fabric having an areal density of 400 to 1,000 g/m 2 composed of 20 to 60 parts by weight of PET fibers and 20 to 80 parts by weight of LM or RM fibers, or 20 to 60 parts by weight of PET fibers It consists of a nonwoven fabric having an areal density of 400 to 1,000 g/m2, composed of 20 to 80 parts by weight of LM or RM fiber and 20 to 40 parts by weight of polyolefin fiber, and the second base layer 2b is 20 to 50 parts by weight of glass fiber and 20 to 60 parts by weight of polypropylene fiber and 20 to 40 parts by weight of polyolefin fiber, and is composed of a nonwoven fabric having an areal density of 400 to 1,000 g/m2, and a PET nonwoven layer (3a) of the microfiber sound absorbing layer (3), a melt blow nonwoven fabric The layer (3b) and the PET non-woven fabric layer (3c) are each made of a nonwoven fabric having an areal density of 100 to 300 g/m 2 , a composite material for an engine cover or engine underfloor The PET nonwoven fabric layer (3a) according to claim 1 or 2, wherein the microfiber sound-absorbing layer (3) is a PET nonwoven fabric layer (3a). Composite material for automobile engine cover or engine underfloor, characterized in that it is a laminate in which the melt blow non-woven fabric layer (3b) and the PET non-woven fabric layer (3c) are sequentially laminated and the outer edge is bonded by a sewing method or ultrasonic fusion method a). Consists of water-repellent and oil-repellent coated PET fabric, an epidermis layer (1) with an areal density of 160 to 300 g/m2, a urethane hot melt bonding layer (B) with an areal density of 25 to 100 g/m2, and a non-woven fabric composed of PET fibers and LM or RM fibers. Or prepare a first base layer (2a) made of a nonwoven fabric composed of PET fiber, LM or RM fiber, and polyolefin fiber, and a second base layer (2b) composed of a nonwoven fabric composed of glass fiber, PP fiber, and polyolefin fiber the first step to
b). A PET microfiber nonwoven layer of 1.5 to 2 denier (3a), a melt blow nonwoven layer (3b) composed of 1.5 to 2 denier PP microfiber and 1.5 to 2 denier PET microfiber in the same weight ratio and 1.5 to 2 denier PET A second step of manufacturing the microfiber sound-absorbing layer 3 consisting of a laminate by sequentially stacking the microfiber non-woven fabric layer 3c and bonding the outer edges by a sewing method or ultrasonic fusion bonding method,
c). After bonding the first base layer (2a) and the second base layer (2b) of the first step by needle punching, the urethane hot melt bonding layer (B) and the skin layer (1) are laminated to the first base layer (2a) side, A third step of manufacturing a molded body (S) by molding by a pressure press,
d). Laminating the microfiber sound-absorbing layer (3) toward the second base layer side of the molded body (S) and bonding by ultrasonic welding method to manufacture a composite material (P) Car engine cover or characterized in that it comprises a fourth step Manufacturing method of composite material for engine underfloor. The vehicle engine according to claim 4, wherein in the second step, a PP film having an areal density of 100 g/m 2 is additionally interposed between the first base layer (2a) and the second base layer (2b) and laminating in a gas lamination method. A method for manufacturing a composite material for a cover or engine underfloor. The method according to claim 4 or 5, wherein the first base layer (2a) of the first step is made of a nonwoven fabric having an areal density of 400 to 1,000 g / m composed of 20 to 60 parts by weight of PET fibers and 20 to 80 parts by weight of LM or RM fibers. or 20 to 60 parts by weight of PET fiber, 20 to 80 parts by weight of LM or RM fiber, and 20 to 40 parts by weight of polyolefin fiber, and is composed of a nonwoven fabric having an areal density of 400 to 1,000 g/m2, and the second base layer (2b) is It consists of a nonwoven fabric having an areal density of 400 to 1,000 g/m2, composed of 20 to 50 parts by weight of glass fiber, 20 to 60 parts by weight of polypropylene fiber, and 20 to 40 parts by weight of polyolefin fiber, and the PET microfiber nonwoven fabric of the microfiber sound-absorbing layer (3) The layer (3a), the melt blow nonwoven fabric layer (3b) and the PET microfiber nonwoven fabric layer (3c) are each made of a nonwoven fabric having an areal density of 100 to 300 g/m 2 A method of manufacturing a composite material for an automobile engine cover or engine underfloor.

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