KR20150072252A - Resin compositions for porous plastics - Google Patents

Abstract

The present invention relates to a porous plastic resin composition. The porous plastic resin composition includes: 30 to 70 wt% of polyamide-based resins; 5 to 20 wt% of porous fillers; 15 to 30 wt% of inorganic reinforcing agents; and 5 to 20 wt% of inorganic fillers. The porous plastic resin composition can reduce the weight of a product and have excellent physical properties such as vibration shielding performance, noise absorption, and dynamic stiffness due to the porosity, thereby being for various uses such as an air cleaner housing in a vehicle.

Description

[0001] RESIN COMPOSITIONS FOR POROUS PLASTICS [0002]

The present invention relates to a porous plastic resin composition, and more particularly, to a porous plastic resin composition which contains a proper amount of a porous filler, an inorganic reinforcing agent and an inorganic filler in a polyamide-based resin, thereby reducing the specific gravity by 7 to 8% And a porous plastic resin composition for automobile air cleaner housings having improved dynamic rigidity.

Conventionally, reinforced plastic resin compositions for automobile air cleaner housings have increased vibration and noise depending on the size of the automobile and the structure and shape of the air cleaner. Therefore, in order to alleviate vibration and noise, nylon resin-based polyamide 6 or polyamide 66, 30% by weight of functional plastic is used. In addition, the porous plastic material of polyamide 66 is difficult to use as a resin composition for automobile air cleaner housing due to low dynamic rigidity in some automobile air cleaner housing structures.

Korean Patent Laid-Open Publication No. 2013-0049369 discloses a porous plastic composition for an intake system housing, which comprises an inorganic filler or a glass short fiber reinforced with an alloy resin comprising a polypropylene resin, a polyamide resin or a two- A porous inorganic resin filler and a special inorganic low foaming agent are added to reduce the specific gravity by 15% or more, and the porous plastic resin is improved in the vibration, noise absorbing and blocking function by the porous structure. However, There is a limit in the dynamic stiffness.

Therefore, a resin composition having more suitable properties for application to automobile air cleaner housings is desperately needed.

1: Korea Patent Publication No. 2011-0114358

Accordingly, the present inventors have found that a porous plastic resin composition for an automobile air cleaner housing having excellent rigidity can be obtained, as well as a reduction in specific gravity, an excellent vibration absorbing function, a noise absorbing function, and a shutoff function as well as a reduction in specific gravity. .

Accordingly, an object of the present invention is to provide a porous plastic resin composition having not only a specific gravity reduction but also a physical property excellent in vibration, sound absorption, shutoff function and dynamic rigidity with porosity.

Another object of the present invention is to provide an automotive air cleaner housing made of the porous plastic resin composition.

In order to solve the above problems, the present invention provides a thermoplastic resin composition comprising (A) 30 to 70% by weight of a polyamide-based resin; (B) 5 to 20% by weight of a porous filler; (C) 15 to 30% by weight of an inorganic reinforcing agent; And (D) 5 to 20% by weight of an inorganic filler.

The present invention also provides an automotive air cleaner housing made of the porous plastic resin composition.

The porous plastic resin composition according to the present invention has physical properties such as vibration, noise absorption, blocking function and dynamic rigidity, as well as a 7 to 8% specific gravity lower than that of the conventional material. Furthermore, due to the reduction of the weight, automobile fuel economy can be improved and the cost can be reduced.

Also, the porous plastic resin composition can be more suitably applied to an automobile air cleaner housing.

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

(A) 30 to 70% by weight of a polyamide-based resin; (B) 5 to 20% by weight of a porous filler; (C) 15 to 30% by weight of an inorganic reinforcing agent; And (D) 5 to 20% by weight of an inorganic filler.

The polyamide-series resin (A) uses polyamide 6, polyamide 66, or a mixture thereof, which is excellent in mechanical rigidity and heat resistance. The polyamide-based resin is preferably used in an amount of 30 to 70% by weight. When the amount of the polyamide-based resin is less than 30% by weight, there is a problem of deterioration of mechanical properties. When the amount of the polyamide-based resin is more than 70% by weight,

The porous filler (B) is preferably glass beads having a diameter of 30 to 50 μm and a specific gravity of 0.5 to 0.6, preferably 5 to 20 wt%. When the diameter of the glass beads is less than 30 탆, a problem of insufficient lightweighting occurs. When it exceeds 50 탆, a problem of mechanical property deterioration occurs. When the specific gravity is less than 0.5, mechanical property deterioration problems occur. It is preferable to use in the above range.

When the amount of the porous glass beads is less than 5% by weight, a problem of insufficient weight is generated. When the amount of the porous glass beads is more than 20% by weight, mechanical properties are deteriorated.

The inorganic reinforcing agent (C) is a glass short staple fiber used for improving the mechanical properties, and it is preferable to use 15 to 30% by weight. If the glass short staple fiber is less than 15% by weight, degradation of water property may occur. If the glass staple fiber is more than 30% by weight, a problem of insufficient lightening may occur.

The inorganic filler (D) improves moldability and dimensional stability, and it is preferable to use barium sulfate. Due to the porous glass beads, the specific gravity, which is characteristic of the porous material, and the function of absorbing and blocking vibration and noise are improved and the porous body is maintained. At this time, noise and vibration can be blocked through barium sulfate having a high specific gravity, It is preferable to use barium sulfate because barium can provide an intake-machine porous plastic resin composition excellent in dynamic rigidity.

(A) 30 to 70% by weight of a polyamide-based resin; (B) 5 to 20% by weight of a porous filler; (C) 15 to 30% by weight of an inorganic reinforcing agent; And (D) 5 to 20% by weight of an inorganic filler as a main component, (E) 0.1 to 0.5 parts by weight of a primary antioxidant (E), based on 100 parts by weight of the porous plastic resin composition. (F) 0.1 to 0.5 parts by weight of a secondary antioxidant; (G) 0.1 to 0.5 parts by weight of lubricant; And 1 to 5 parts by weight of a carbon masterbatch for coloring (H).

The antioxidant is preferably a primary or secondary antioxidant to improve the performance and processing characteristics of a molded article and inhibit the oxidative deterioration reaction during injection molding, using a phenolic or phosphite antioxidant. Preferably, 0.1 to 0.5 parts by weight of the primary and secondary antioxidants are used as the antioxidant. When the amount of the antioxidant is less than 0.1 parts by weight, the physical properties of the composition are deteriorated. When the amount of the antioxidant is more than 0.5 parts by weight, there is a problem in appearance quality.

The lubricant (G) is used to provide flowability and releasability of the resin, preferably 0.1 to 0.5 parts by weight. In this case, when the lubricant is less than 0.1 part by weight, there arises a problem of extrusion and injection processability. When the lubricant is more than 0.5 part by weight, appearance quality problems arise. Olefin-based lubricants can be used as lubricants.

The (H) coloring carbon masterbatch contains carbon black and serves as a coloring agent for the resin, and it is preferable to use 1 to 5 parts by weight of the coloring carbon masterbatch. When the master batch is less than 1 part by weight, appearance quality problems occur. When the master batch is more than 5 parts by weight, appearance quality problems and mechanical strength deterioration occur.

The porous plastic resin composition of the present invention thus produced has not only a reduction in specific gravity but also a porous property, such as vibration, noise absorption, blocking function and dynamic rigidity. Therefore, the present invention can be widely used for automobile air cleaner housings.

Hereinafter, the present invention will be described in more detail with reference to examples. However, these examples are for illustrating the present invention, and the scope of the present invention is not limited thereto.

Example  1-5

Porous plastic resin compositions were prepared according to the composition ratios shown in Table 1 below and extruded in a twin-screw extruder (TSE) to prepare test pieces of Examples 1 to 5.

Comparative Example  1-4

Test pieces of Comparative Examples 1 to 4 were produced in the same manner as in Examples 1 to 5 using raw materials shown in Table 1 below.

Porous plastic resin composition division Example Comparative Example One 2 3 4 5 One 2 3 4 chief ingredient
(weight%) (A) Resin PA66 70 65 35 - 70 70 85 - 75 PA66 - - 35 70 - - - 85 - (B) Porous filler Porous filler ^{1 )} 5 5 5 5 - - 5 5 - Porous filler ^{2 )} - - - - 5 - - - - (C) Glass staple fiber 15 15 15 15 15 30 10 10 15 (D) Inorganic filler Barium sulfate 10 15 10 10 10 - - - 10 Sum 100 100 100 100 100 100 100 100 100 additive
(Parts by weight) ^*
Antioxidant Phenolic 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Phosphite system 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Lubricant 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 Carbon master batch for coloring 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Remarks PA66, PA6 - Rhodia / 24AE1, KP / BRT (2.5).
Porous Filler - 3M / S60, S60HS
: Porous filler ^{1 )} : diameter 30 탆, specific gravity 0.6
Porous filler ^{2 )} : diameter 50 탆, specific gravity 0.5
Glass staple fiber - OCV / GF-123D
Barium sulfate - KOCH / KCB-03
Antioxidant - Songwon Industry / SONGNOX
Lubricant - Pioneer / SUNLUBE EBS
Carbon master batch for tinting - Chaoyang / M / B K001, K003, K007 * The units of additives are expressed in parts by weight based on 100 parts by weight of the porous plastic resin composition containing (A), (B), (C) and (D) as main components.

The physical properties of the test pieces prepared according to Examples 1 to 5 and Comparative Examples 1 to 4 were measured in the following manner and physical properties of the porous plastic resin compositions are shown in Table 2 below.

Experimental Example : Measurement of Physical Properties of Specimen

The physical properties shown in Table 2 are the average values except for the upper limit value and the lower limit value by measuring seven specimens.

(1) Measurement of Tensile Strength A test piece was manufactured in accordance with ASTM D638 (Standard Test Method for Tensile Properties of Plastic), and tensile strength and elongation at break (Tensile strength [Pa] = maximum load [N] / cross section area of initial sample [m 2] elongation (%) = elongation to break point / initial length).

(2) Measurement of Flexural Strength: The test specimens were manufactured in accordance with ASTM D790 (Standard Test Method for Tensile Properties of Plastic), and flexural strength and flexural modulus were measured using a universal testing machine (UTM) Respectively.

(3) Measurement of impact strength: Impact strength was measured using an Izod Impact Tester manufactured according to ASTM D256 (Standard Test Method for Tensile Properties of Plastic).

(4) Specific gravity measurement: (Specific gravity) was measured using an electron specific gravity tester according to ASTM D792 (weight of 200g, area of less than 60x80x30mm) according to the Standard Test Method for Tensile Properties of Plastic.

(5) Dynamic stiffness measurement: The dynamic stiffness was measured by using the actual product in accordance with ES28110-12.

(6) Sound insulation performance evaluation method: The sound insulation performance evaluation method of the present invention is defined by the following equation by calculating the sound absorption coefficient using the ASTM E1050-07 impedance tube measurement method.

Sound absorption rate α = 1 - Reflection frequency / incident sound frequency (incidence frequency: 100 ~ 5000Hz, 1 / 3oct interval)

Sample 1 had a mean thickness of 3.2 mm x 98.8 mm Ø x 3 in diameter, and Sample 2 had an average value of 3.2 mm x 28.8 mm Ø x 3 in diameter. The signal processing and measurement equipment for the normal acoustic impedance was Symphonie 01dB Were used.

Property Value of Porous Plastic Resin Composition division Physical properties Dynamic rigidity Sound insulation performance
(Absorption threshold) The tensile strength
(MPa) Flexural strength
(MPa) Impact strength
(J / m) importance
(g / cc) 340 (N / mm) Example 1 130 190 58 1.27 524.8 0.54 Example 2 102 162 52 1.30 536.7 0.56 Example 3 117 176 56 1.27 498.7 0.48 Example 4 106 168 56 1.27 483.8 0.48 Example 5 108 166 50 1.26 350.0 0.42 Comparative Example 1 182 240 108 1.36 693.7 0.22 Comparative Example 2 88 157 49 1.21 316.6 0.43 Comparative Example 3 85 152 48 1.21 316.9 0.41 Comparative Example 4 132 193 58 1.39 333.2 0.35

As shown in Table 2, the porous plastic resin compositions of Examples 1 to 5 according to the present invention had a lower specific gravity than those of Comparative Examples 1 to 4, Of course, it has been confirmed that it has excellent physical properties such as vibration, absorption of noise, blocking function and dynamic rigidity by porosity.

In other words, according to the present invention, the porous body of the porous body for lighter weight remains unchanged, and the specific gravity of the resin is increased to achieve a certain level of light weight ratio and improvement of toughness.

The present invention can be widely used for automobile air cleaner housings.

Claims (6)

(A) 30 to 70% by weight of a polyamide-based resin;
(B) 5 to 20% by weight of a porous filler;
(C) 15 to 30% by weight of an inorganic reinforcing agent; And
(D) 5 to 20% by weight of an inorganic filler;
Wherein the porous plastic resin composition is a porous plastic resin composition.
The porous plastic resin composition according to claim 1, wherein the polyamide-series resin is polyamide 6, polyamide 66 or a mixture thereof.
The porous plastic resin composition according to claim 1, wherein the porous filler is glass beads having a diameter of 30 to 50 占 퐉 and a specific gravity of 0.5 to 0.6.
The porous plastic resin composition according to claim 1, wherein the inorganic reinforcing agent is a short staple fiber.
The porous plastic resin composition according to claim 1, wherein the inorganic filler is barium sulfate.
An air cleaner housing made from the porous plastic resin composition of any one of claims 1 to 5.