KR101228143B1 - Manufacturing method of biodegradable composite panel for car interior - Google Patents

Abstract

The present invention relates to a method for manufacturing a biodegradable composite panel for automobile interior, and more specifically, the other side blending step of blending the natural reinforcing fiber and polylactic acid fiber, carding the other blended fiber and punching punching to form a felt layer The first felt layer forming step, the other surface step to mask the polylactic fiber, the second felt layer forming step of carding and needle punching the other polylactic fiber to form a felt layer, the upper and lower surfaces of the first felt layer Forming the second felt layer on the surface and needle punching, non-woven layer forming step and biodegradable non-woven fabric layer to form a biodegradable non-woven fabric layer made of natural fibers on the upper surface and the lower surface of the laminate passed through the lamination step The formed laminate is preheated, followed by a molding step of cooling.

Description

Manufacturing method of biodegradable composite panel for automobile interior {MANUFACTURING METHOD OF BIODEGRADABLE COMPOSITE PANEL FOR CAR INTERIOR}

The present invention relates to a method for manufacturing a biodegradable composite panel for automobile interiors, and more particularly, using biodegradable and improved mechanical properties, without deformation in the use environment, and biodegradation rate upon disposal. The present invention relates to a fast manufacturing method of a biodegradable composite panel for automobile interior.

The present invention relates to a method for manufacturing a biodegradable composite panel for automobile interiors, and more particularly, using biodegradable and improved mechanical properties, without deformation in the use environment, and biodegradation rate upon disposal. The present invention relates to a fast manufacturing method of a biodegradable composite panel for automobile interior.

Conventionally used composite panels for automobile interiors are manufactured from synthetic resin compounds. Composite panels for automobile interiors manufactured from synthetic resin compounds emit carbon dioxide and various harmful substances during the manufacturing process. There was a problem with this contamination.

In addition, a large amount of environmental pollutants are discharged when incinerated for disposal, and when a landfill is used to reduce the emission of pollutants, it is decomposed by microorganisms present in the soil. There are problems that require hundreds of years of time.

In order to solve the above problems, the development of a composite panel using a vegetable natural fiber with excellent biodegradation has been proposed, but a composite panel using a vegetable natural fiber is significantly reduced mechanical properties compared to a composite panel made of synthetic resin It is poor in moisture resistance, there is a problem that a restriction occurs in the application area.

In addition, the above-described method of using a mixture of vegetable natural fibers and synthetic fibers is used, but various problems such as environmental pollution occur due to the addition of synthetic fibers, and separate synthetic and natural fibers at the time of disposal. Therefore, a problem arises in that the processing cost increases.

An object of the present invention is to provide a method for producing a biodegradable composite panel for automobile interior which is excellent in biodegradability and mechanical properties, there is no limit to the application site, it is quickly decomposed upon disposal to cause environmental pollution.

Another object of the present invention is to provide a method for producing a biodegradable composite panel for automobile interior which has excellent moisture resistance due to a laminated structure that blocks moisture and does not undergo a separate separation process at the time of disposal. .

An object of the present invention is the other surface blending step of blending the natural reinforcing fibers and polylactic acid fiber, the first felt layer forming step of forming a felt layer by carding and nipple punching the blended fiber of the other surface, the other surface step of the polylactic fiber A second felt layer forming step of carding and needle punching the other polylactic acid fiber to form a felt layer, a laminating step of forming and needle punching the second felt layer on the upper and lower surfaces of the first felt layer, The nonwoven fabric layer forming step of forming a biodegradable nonwoven fabric layer made of natural fibers on the upper surface and the lower surface of the laminate after the lamination step and the forming step of preheating the laminate formed with the biodegradable nonwoven fabric layer is cooled. It is achieved by providing a method for producing a biodegradable composite panel for automobile interior.

According to a preferred feature of the present invention, the other surface blending step is to be made by 50 to 70 parts by weight of the natural reinforcing fibers and 30 to 50 parts by weight of the polylactic fiber mixed with the other surface.

According to a more preferred feature of the present invention, the natural reinforcing fiber has a length of 50 to 80 millimeters, and is made of one or more selected from the group consisting of jute fiber, hemp fiber and hemp fiber.

According to a more preferred feature of the invention, the nonwoven layer forming step is to be made of a needle punching or thermocompression process.

According to a still further preferred feature of the present invention, the polylactic acid fiber is crimped and has a length of 50 to 80 millimeters.

According to a further preferred feature of the invention, the biodegradable nonwoven layer is to be a thin film having a surface density of 20 to 100g / m ² .

According to a further preferred feature of the invention, the natural fiber is made of one selected from the group consisting of cotton, paper mulberry, pulp and seaweed.

According to a further preferred feature of the invention, the forming step is to be made by pre-heating the laminate formed with the biodegradable non-woven fabric layer in a hot press and oven preheating apparatus having a surface temperature of 210 to 230 ℃ and then pressed in a cold press.

The manufacturing method of the biodegradable composite panel for automobile interior according to the present invention is excellent in biodegradability and mechanical properties, and there is no limitation in the application area, and it shows an excellent effect that does not cause environmental pollution due to fast decomposition speed at disposal.

In addition, due to the laminated structure that blocks moisture, it is excellent in moisture resistance, and does not undergo a separate separation process at the time of disposal, thereby exhibiting an excellent effect at low processing cost.

1 is a flow chart illustrating a method for manufacturing a biodegradable composite panel for automobile interior according to the present invention.
Figure 2 is an exploded perspective view showing a biodegradable composite panel for automobile interior prepared by the present invention.
3 is a large constant temperature and humidity chamber (Constant Temp & Humid Chamber) of Koryo QMS Co., Ltd. to find out the degree of deformation of the shape according to the rigidity decrease in the use environment of the automotive headliner manufactured in Example 3 It is a photograph showing the state before and after the environmental test.
Figure 4 before and after conducting an environmental test using a large constant temperature and humidity bath of Kori QMS Co., Ltd. to determine the degree of deformation of the shape according to the stiffness in the use environment of the automotive headliner manufactured in Example 4 It is a photograph showing the appearance.
5 is before and after conducting an environmental test using a large constant temperature and humidity bath of Koryo QMS Co., Ltd. to determine the degree of deformation of the shape according to the stiffness decrease in the use environment of the automotive headliner manufactured by Comparative Example 3 It is a photograph showing the appearance.
6 is before and after performing an environmental test using a large constant temperature and humidity bath of Kori QMS Co., Ltd. to determine the degree of shape deformation according to the stiffness decrease in the use environment of the automotive headliner manufactured by Comparative Example 4 It is a photograph showing the appearance.

Hereinafter, preferred embodiments of the present invention and physical properties of the respective components will be described in detail with reference to the accompanying drawings. However, the present invention is not limited thereto, And this does not mean that the technical idea and scope of the present invention are limited.

In the method for manufacturing a biodegradable composite panel for automobile interior according to the present invention, the other side blending step (S101) of other reinforcing fibers and polylactic acid fibers, carding and punching the other side of the mixed fibers to form a felt layer The first felt layer forming step (S103), the other surface step (S105) to rid the polylactic acid fiber, the second felt layer forming step (S107) to form a felt layer by carding and needle punching the other polylactic acid fiber, Forming the second felt layer 20 on the upper and lower surfaces of the first felt layer 10 and needle punching step (S109), the upper surface of the laminate after the above-mentioned lamination step (S109) and The non-woven fabric layer forming step (S111) and the biodegradable nonwoven fabric layer 30 formed of a natural fiber to form a biodegradable nonwoven fabric layer 30 on the lower surface consists of a molding step of preheating and cooling.

The other surface blending step (S101) is a step of blending the natural reinforcing fiber and polylactic acid fiber, the other side is made by mixing 50 to 70 parts by weight of natural reinforcing fiber and 30 to 50 parts by weight of polylactic acid fiber, the aforementioned natural reinforcing In order to evenly mix the fiber and the polylactic acid fiber described above, an air blowing process is repeatedly performed.

At this time, the above-mentioned natural reinforcing fiber has a length of 50 to 80 millimeters, and is made of one or more selected from the group consisting of jute fiber, hemp fiber and hemp fiber, combined with the aforementioned polylactic acid fiber has improved mechanical strength It serves to provide a biodegradable composite panel (1) for automobile interior.

The polylactic acid fiber described above is crimped and has a length of 50 to 80 millimeters, and improves carding property in the first felt layer forming step (S101) described above, and is heated by mixing with the aforementioned natural reinforcing fiber. When melted, it penetrates between natural reinforcing fibers and acts as a binder for binding natural reinforcing fibers.

The above-described first felt layer forming step (S103) is a step of forming a felt layer by carding and nipple punching the other surface mixed fiber, and the other surface mixed fiber is evenly arranged through the other surface mixed fiber step (S101). After carding so as to have the shape of the web is manufactured, needle punching to increase the binding force of the web.

The other surface step (S105) is a step of burning the polylactic acid fiber, in order to evenly disperse the polylactic acid fiber, the air blowing (Air Blowing) process is repeatedly performed.

At this time, the above-mentioned polylactic acid fiber is crimped and has a length of 50 to 80 millimeters. The coating film is formed on the surface of the first felt layer 10 described above to provide the mechanical properties of the biodegradable composite panel 1 for automobile interiors. It serves to improve the strength and to prevent the penetration of moisture into the first felt layer 10 in the use environment to prevent the stiffness of the first felt layer 10 is lowered.

The second felt layer forming step (S107) is a step of forming a felt layer by carding and needle punching the other polylactic acid fiber, the other surface fibers are uniformly arranged through the other surface step (S105) described above to have a uniform shape. After carding so as to have the shape of the web, the needle punching step to increase the binding force of the web.

In the above-described lamination step S109, the second felt layer 20 is formed on the upper and lower surfaces of the first felt layer 10 and needle punched. The first felt layer 10 is formed. ) And the weight ratio of the second felt layer 20 is preferably about 1: 1 to 4: 1, and the laminated body laminated through the needle punching proceeded in the laminating step S109 is made of bio-integrated composite panel (1). ) To improve mechanical properties.

Nonwoven fabric layer forming step (S111) is a step of forming a biodegradable nonwoven layer 30 made of natural fibers on the upper and lower surfaces of the laminate through the above-described lamination step (S109), needle punching or thermocompression The biodegradable nonwoven fabric is formed on the upper and lower surfaces of the laminate through the biodegradable nonwoven fabric layer 30. The biodegradable nonwoven fabric layer 30 is formed by a spunlaid method and has a surface density of 20 to 100 g / m ² . .

At this time, the above-mentioned natural fiber is preferably made of one selected from the group consisting of cotton, paper mulberry, pulp and seaweed, and the biodegradable nonwoven fabric composed of such components improves the appearance quality of the biodegradable composite panel 1 for automobile interiors, When preheating the composite panel in the hot mold, it prevents the composite panel from sticking to the hot mold and prevents the surface of the composite panel from being damaged when transferring the composite panel to the molding die.

The above-mentioned forming step (S113) is a step of preheating and cooling the laminate in which the biodegradable nonwoven fabric layer 30 is formed, and hot pressing the surface of the laminate having the biodegradable nonwoven fabric layer 30 formed thereon at a temperature of 210 to 230 ° C. After preheating with an oven preheater, it is pressed in a cooling press to manufacture a biodegradable composite panel 1 for automobile interior.

Hereinafter, the physical properties of the biodegradable composite panel for automobile interior according to the present invention and the biodegradable composite panel for automobile interior manufactured by the same method will be described.

≪ Example 1 >

60 parts by weight of jute fiber and 40 parts by weight of polylactic acid fiber are mixed to produce a first felt layer having a surface density of 700 g / m ² , and made by putting polylactic acid fiber on the upper and lower surfaces of the first felt layer. Biodegradable non-woven fabric layer formed by laminating a second felt layer having a surface density of 200 g / m ² , made of cotton fibers on the upper and lower surfaces of the laminate, and formed of a thin film having a surface density of 50 g / m ² . After preheating and pressing at 60kgf / cm ² for 60 seconds using an annual plate mold having a surface temperature of 220 ° C., cooling and pressing at 80kgf / cm ² for 45 seconds using a cold plate mold was performed. Biodegradable composite panels for automobile interiors having a thickness of millimeters were prepared.

<Example 2>

Proceed in the same manner as in Example 1, 70 parts by weight of jute fiber, a natural reinforcing fiber and 30 parts by weight of polylactic acid were mixed to prepare a biodegradable composite panel for automobile interior by applying a first felt layer having a surface density of 700 g / m ² . It was.

<Example 3>

Proceed in the same manner as in Example 1, an automobile headliner was manufactured by using an automobile headliner mold instead of a cooling flat mold.

<Example 4>

Proceed in the same manner as in Example 2, an automobile headliner was manufactured using an automobile headliner mold instead of a cooling flat mold.

&Lt; Comparative Example 1 &

After mixing 60 parts by weight of jute fiber and 40 parts by weight of polylactic acid fiber to produce a biodegradable composite panel having a surface density of 1200 g / m2, 60 seconds at a pressure of 60 kgf / cm2 using a hot plate mold having a surface temperature of 220 ° C After preheating pressurization using a cold flat die for 80 seconds at a pressure of 80kgf / cm2 by cold pressing for 45 seconds to prepare a biodegradable composite panel for automobile interior having a thickness of 2.5mm.

Comparative Example 2

Proceed in the same manner as in Comparative Example 1, 70 parts by weight of jute fiber and 30 parts by weight of polylactic acid fiber was mixed to prepare a biodegradable composite panel for automobile interior.

&Lt; Comparative Example 3 &

Proceed in the same manner as in Comparative Example 1, an automobile headliner was manufactured using an automobile headliner molding mold instead of a cooling flat mold.

&Lt; Comparative Example 4 &

Proceed in the same manner as in Comparative Example 2, an automobile headliner was manufactured by using an automobile headliner mold instead of a cooling flat mold.

Tensile strength, moisture resistance tensile strength, flexural strength and moisture resistance flexural strength of the biodegradable composite panel for automobile interior manufactured through the above Examples 1 to 2 and Comparative Examples 1 to 2 were measured by INSTRON's UTM (Universal Test Machine) It is shown in Table 1 below.

{However, the tensile strength of the composite panel specimen of 50mm × 150mm size was taken from MD (Machine Direction) and AMD (Across Machine Direction) at least 5 sheets, and the average tensile strength was measured at 50mm / min.

At this time, the condition was carried out at a condition maintained at 65% RH at a temperature of 23 ℃, the moisture resistance condition was left for 24 hours at 90% RH at a temperature of 50 ℃ and then proceeded after standing for 1 hour in a state condition.

The flexural strength was averaged by measuring the flexural strength at the rate of 5mm / min by taking five or more composite panel specimens of 50mm × 150mm size with MD and AMD.

At this time, the condition was carried out at a condition maintained at 65% RH at a temperature of 23 ℃, the humidity condition was left for 24 hours at 90% RH at a temperature of 50 ℃ and then proceeded after standing for 1 hour at the state conditions.}

TABLE 1

Biodegradable composite panel for automobile interior prepared by the present invention, as shown in Table 1 above compared to the biodegradable composite panel for automobile interior prepared through Comparative Examples 1 to 2 tensile strength, moisture resistance tensile strength, flexural strength and moisture resistance flexure It can be seen that the strength is significantly improved.

In order to find out the degree of shape deformation due to the decrease in rigidity in the use environment of the headliner for automobiles manufactured through the above-described Examples 3 to 4 and Comparative Examples 3 to 4, a large constant temperature / humidity tank (Constant Temp.) Of KOREA QMS Co., Ltd. & Humid Chamber) to conduct an environmental test, the results are shown in Figures 3 to 6.

(However, the environmental test is heated to 23 ° C to 90 ° C for 1 hour, maintained at 90 ° C for 3 hours, cooled from 90 ° C to 23 ° C for 1 hour, and maintained at 23 ° C for 1 hour And cooled to minus 40 ° C. at 23 ° C. for 1 hour, maintained at minus 40 ° C. for 3 hours, heated to minus 40 ° C. at 23 ° C. for 1 hour, maintained at 23 ° C. for 1 hour, and maintained for 1 hour. Relative humidity is raised to 90% RH while heating from 23 ° C. to 50 ° C., maintaining a temperature of 50 ° C. and a relative humidity of 90% RH for 7 hours, cooling to 23 ° C. and 90% at a temperature of 50 ° C. for 1 hour. After reducing the RH of to 50% in one step, a total of three iterations were measured to determine the deformation of the test product.)

As shown in FIGS. 3 to 6, in the case of the automotive headliner manufactured through Comparative Examples 3 to 4, the environmental test resulted in fabric peeling and shape deformation of the product, and the automotive headliner manufactured through Examples 3 to 4 It can be seen that the second felt layer and the biodegradable nonwoven fabric layer made of polylactic acid fiber were applied so that the fabric peeling and shape deformation did not occur.

S101; Tamyeon Horn Island
S103; First felt layer forming step
S105; Masking Step
S107; Second felt layer forming step
S109; Lamination stage
S111; Nonwoven Layer Formation Step
S113; Molding step
One ; Biodegradable Composite Panel for Automobile Interior
10; First felt layer
20; 2nd felt layer
30; Biodegradable Nonwoven Layer

Claims (8)

The other surface blending step of blending the natural reinforcing fiber and the polylactic acid fiber;
A first felt layer forming step of forming a felt layer by carding and nipple punching the other surface mixed fiber;
The other surface step of taking away the polylactic acid fiber;
Forming a felt layer by carding and needle punching the other polylactic acid fiber;
A lamination step of forming the second felt layer and needle punching the upper and lower surfaces of the first felt layer;
A nonwoven fabric layer forming step of forming a biodegradable nonwoven layer made of natural fibers on the upper and lower surfaces of the laminate having undergone the lamination step; And
Consists of a molding step of preheating the laminated body formed with a biodegradable nonwoven layer and then cooling,
The nonwoven fabric layer forming step is a method of manufacturing a biodegradable composite panel for automobile interior, characterized in that the needle punching or thermocompression process.
The method according to claim 1,
The other surface blending step is a method for producing a biodegradable composite panel for automobile interiors, characterized in that the other side is mixed with 50 to 70 parts by weight of natural reinforcing fibers and 30 to 50 parts by weight of polylactic acid fiber. The method according to claim 1,
The natural reinforcing fiber has a length of 50 to 80 millimeters, and the manufacturing method of the biodegradable composite panel for automobile interiors, characterized in that made of at least one selected from the group consisting of jute fibers, hemp fibers and hemp fibers.
delete The method according to claim 1,
The polylactic acid fiber is crimped, and has a length of 50 to 80 millimeters.
The method according to claim 1,
The biodegradable nonwoven fabric layer is a method for manufacturing a biodegradable composite panel for automobile interiors, characterized in that the thin film having a surface density of 20 to 100g / m ² .
The method according to claim 1,
The natural fiber is a method of manufacturing a biodegradable composite panel for automobile interiors, characterized in that made of one selected from the group consisting of cotton, mulberry, pulp and seaweed.
The method according to claim 1,
In the forming step, a biodegradable composite panel for automobile interiors is formed by preheating a laminate having a biodegradable nonwoven fabric layer with a hot press and an oven preheater having a surface temperature of 210 to 230 ° C., and then pressing it in a cold press. Way.

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