阅读说明：本技术 一种汽车后盖用轻量化内饰材料及其制备方法 (Lightweight interior material for automobile rear cover and preparation method thereof ) 是由 方诚 于 2020-11-26 设计创作，主要内容包括：本发明涉及一种汽车后盖用轻量化内饰材料,该内饰材料从上到下依次包括：表面地毯(1)和玻纤板(2),所述的表面地毯(1)与玻纤板(2)的厚度之比为(4-8):1,其制备方法包括以下步骤：(1)玻纤板(2)的加工成型：采用针刺复合工艺,将玻纤层(22)一面缝合PE粘合层(21),另一面缝合水刺无纺布(23)；(2)表面地毯(1)与玻纤板(2)的热压成型,最终得到汽车后盖用轻量化内饰材料。与现有技术相比,本发明具有力学性能良好、VOC散发量少等优点。(The invention relates to a light-weight interior material for an automobile rear cover, which comprises the following components in sequence from top to bottom: the surface carpet comprises a surface carpet (1) and a glass fiber board (2), wherein the thickness ratio of the surface carpet (1) to the glass fiber board (2) is (4-8):1, and the preparation method comprises the following steps: (1) and (3) processing and forming the glass fiber plate (2): adopting a needling composite process, sewing a PE bonding layer (21) on one surface of a glass fiber layer (22), and sewing a spunlace non-woven fabric (23) on the other surface; (2) and (3) hot-press molding the surface carpet (1) and the glass fiber board (2) to finally obtain the lightweight interior material for the automobile rear cover. Compared with the prior art, the invention has the advantages of good mechanical property, small VOC emission and the like.)

1. A lightweight interior material for an automobile rear cover, characterized by comprising, in order from top to bottom: the carpet comprises a surface carpet (1) and a glass fiber board (2), wherein the thickness ratio of the surface carpet (1) to the glass fiber board (2) is (4-8): 1.

2. The lightweight interior material for automobile rear covers as claimed in claim 1, wherein the surface carpet (1) is needle-punched velveteen having a weight of 150-200g/m²。

3. The lightweight interior material for automobile rear covers as claimed in claim 1, wherein the weight per unit area of the glass fiber sheet (2) is 880-920g/m²。

4. The lightweight interior material for an automobile rear cover according to claim 1, wherein the glass fiber sheet (2) comprises, in order from top to bottom: a PE bonding layer (21), a glass fiber layer (22) and a spunlace nonwoven fabric (23).

5. The lightweight interior material for automobile back covers as set forth in claim 4, wherein the PE adhesive layer (21) has a weight per unit area of 40 to 60g/m²。

6. The lightweight interior material for the rear cover of the automobile as claimed in claim 4, wherein the glass fiber layer (22) is made by blending glass fibers and polypropylene fibers in a weight ratio of (48-52) to (52-48).

7. The lightweight interior material for automobile rear covers as set forth in claim 4, wherein the spunlace nonwoven fabric (23) has a basis weight of 40 to 50g/m²。

8. A method for producing a light-weight interior material for automobile back covers as set forth in any one of claims 1 to 7, characterized by comprising the steps of:

(1) and (3) processing and forming the glass fiber plate (2): adopting a needling composite process, sewing a PE bonding layer (21) on one surface of a glass fiber layer (22), and sewing a spunlace non-woven fabric (23) on the other surface;

(2) hot press molding of the surface carpet (1) and the glass fiber board (2):

(2-1) heating and softening the glass fiber plate (2) at high temperature, putting the glass fiber plate into a forming mould, and paving a surface carpet (1);

(2-2) then carrying out compression molding in a mold, and keeping the temperature of the mold at 18 +/-5 ℃ through a water cooling system during the compression molding, thus finally obtaining the lightweight interior material for the automobile rear cover.

9. The method for producing a lightweight interior material for an automobile rear cover according to claim 8, wherein the high-temperature heat-softening in step (2-1) is carried out at a heating temperature of 220 ± 10 ℃ for a time of 150 ± 10 s.

10. The method for manufacturing a lightweight interior material for an automobile rear cover according to claim 8, wherein the press molding in the step (2-2) is performed at a molding pressure of 12 ± 2Mpa for a period of 60 ± 5 seconds.

Technical Field

The invention relates to the field of automotive interior materials, in particular to a lightweight interior material for an automotive rear cover and a preparation method thereof.

Background

At present, the interior decoration material of the rear cover is mostly made of PP plastic by adopting an injection molding process or PP + fibrilia and PP + PET molding felt as a base material.

The rear cover interior parts made of the base materials basically meet the functional requirements of the automobile rear cover interior parts although the rear cover interior parts have certain strength. But is limited by the structure and the material, is not beneficial to the requirements of the appearance, the odor, the VOC and other emission performance of the parts, and the weight of a single part is about 1000g, which is not beneficial to the requirement of light weight of the automobile parts.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a light-weight interior trim material for an automobile rear cover, which has good mechanical property and low VOC emission, and a preparation method thereof.

The purpose of the invention can be realized by the following technical scheme:

a lightweight interior material for an automobile rear cover, comprising, in order from top to bottom: the surface carpet comprises a surface carpet and a glass fiber board, wherein the thickness ratio of the surface carpet to the glass fiber board is (4-8): 1. The thickness ratio of the surface carpet to the glass fiber plate can be approximately the ratio of the unit area weight, namely the surface carpet: the ratio of the glass fiber board is about 1: 5; and the total thickness of the surface carpet and the glass fiber board is about 3mm, namely about 0.5mm after the surface carpet is formed, and about 2.5mm after the surface carpet is formed.

Further, the surface carpet is needle-punched velveteen with the unit area weight of 150-². Preferably 180g/m²The style fabric is multipurpose for middle-end vehicle types, the surface of the fabric is fine and smooth, and the hand feeling is soft.

Further, the unit area weight of the glass fiber board is 880-920g/m². Preferably 900g/m²。

Further, the glass fiber board comprises from top to bottom: PE bonding layer, glass fiber layer and water thorn non-woven fabrics.

Further, the weight per unit area of the PE bonding layer is 40-60g/m². Preferably 50g/m²。

Furthermore, the glass fiber layer is prepared by blending glass fiber and polypropylene fiber according to the weight ratio of (48-52) to (52-48). Wherein the melting point of the polypropylene fiber is 168 ℃.

Furthermore, the unit area weight of the spunlace nonwoven fabric is 40-50g/m². The spunlace nonwoven fabric can improve the tensile property of the glass fiber layer and avoid the situation that the glass fibers are exposed.

In the present invention, the most important contributing to the mechanical properties is the Glass Fiber (GF) which has excellent mechanical properties and is also commonly used as a modified PP particle as a reinforced plastic particle among plastic particles.

However, the tensile properties of glass fibers are poor, i.e. if the part has a large tensile or extended profile, it is possible to use PP + PET material, but with PP + GF material, the forming is difficult and the glass fibers are broken.

Because the automobile tail door inevitably has certain stretching, PP + GF materials are rarely used for manufacturing tail door decorative plate parts at present; in the invention, the spunlace non-woven fabric on the back of the base material is beneficial to improving the tensile property of the glass fiber board.

A method for preparing the lightweight interior material for the rear cover of the automobile as described above, comprising the steps of:

(1) and (3) processing and forming the glass fiber plate: adopting a needling composite process, sewing a PE bonding layer on one surface of the glass fiber layer, and sewing a spunlace non-woven fabric on the other surface of the glass fiber layer;

(2) hot press molding of the surface carpet and the glass fiber board:

(2-1) heating and softening the glass fiber board at a high temperature, wherein the PE bonding layer is softened at the moment, so that the glass fiber board is favorably used for realizing the bonding of the glass fiber board and a surface carpet, putting the glass fiber board into a forming mould, and paving the surface carpet to ensure that the surface carpet and the PE bonding layer are bonded with each other;

(2-2) then carrying out compression molding in a mold, and keeping the temperature of the mold at 18 +/-5 ℃ through a water cooling system during the compression molding, thus finally obtaining the lightweight interior material for the automobile rear cover. The weight of the formed part is 260-320g/0.53m²Compared with 1000g/0.92m²The left and right internal decorative parts of the rear cover of other base materials greatly reduce the weight of the parts on the premise of realizing the functions of the parts.

Further, the heating temperature for high-temperature heating softening in the step (2-1) is 220 +/-10 ℃ and the time is 150 +/-10 s.

Further, the forming pressure of the press forming in the step (2-2) is 12 +/-2 Mpa, and the time is 60 +/-5 s.

And (3) subsequent assembly process: assemble the accessory to obtain automobile rear cover on with light-weighted interior trim material, mainly be: 3M double faced adhesive tape of regulation trade mark, its trade mark is: 3M BT5010, a very excellent adhesive property with a spunlace nonwoven fabric and a rear cover plate metal fitting which are used for obtaining a lightweight interior material for an automobile rear cover. And the 3M double-sided adhesive tape is adhered with the spunlace non-woven fabric on the back of the lightweight interior material for the automobile rear cover to realize assembly.

Compared with the prior art, the invention has the following advantages:

(1) according to the invention, the lightweight PP glass fiber board substrate is adopted, so that the weight of the part is greatly reduced on the premise of realizing the functionality of the part, compared with similar parts, the weight can be reduced by more than 50%, and the lightweight PP glass fiber board substrate is beneficial to realizing the lightweight;

(2) the PP glass fiber board has excellent emission performance, VOC is guaranteed, and 8 substances meet the following requirements: benzene is less than or equal to 10 mu g/m³(ii) a Toluene is less than or equal to 50 mu g/m³(ii) a Ethylbenzene is less than or equal to 50 mu g/m³(ii) a Xylene is less than or equal to 50 mu g/m³(ii) a Styrene is less than or equal to 50 mu g/m³(ii) a Formaldehyde is less than or equal to 150 mu g/m³(ii) a Acetaldehyde is less than or equal to 50 mu g/m³(ii) a C3Olefine aldehyde is less than or equal to 20 mu g/m³(ii) a Acetone is less than or equal to 30 mu g/m³；TVOC≤1800μg/m³(ii) a Really beneficial to the emission of harmful substances of the automobile interior parts and the purification of the environment in the automobile;

(3) the glass fiber in the main body material belongs to mineral fiber, and is different from natural fiber such as cotton fiber, fibrilia and the like, so the glass fiber has high-quality mould resistance, and the mould can not grow within 20 days under the conditions of normal temperature of 23 ℃, 40 ℃ and 100% relative humidity; the glass fiber is used as mineral fiber, has better high and low temperature performance, and can also meet various high and low temperature environments, such as: the part has no deformation, no structural and functional damage in a temperature cycle experiment of-40-80 ℃ and 30 periods (15 days);

(4) the surface velveteen style carpet is applied, so that the appearance of the inner decoration of the rear cover is softer visually and has a lattice tone sense; the use of the 3M double-sided adhesive tape is beneficial to the assembly performance of the rear cover interior trim part and the environment part;

(5) the invention can improve the tensile property of the PP glass fiber board and avoid the risk of breaking the part base material at the position with larger local stretching.

Drawings

FIG. 1 is a schematic structural view of a lightweight interior material for an automobile rear cover in an embodiment;

the reference numbers in the figures indicate: the surface carpet comprises a surface carpet 1, a glass fiber board 2, a PE bonding layer 21, a glass fiber layer 22 and a spunlace non-woven fabric 23.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

Examples

A lightweight interior material for an automobile rear cover, comprising, in order from top to bottom as shown in FIG. 1: a surface carpet 1 and a glass fiber board 2.

Wherein the surface carpet 1 is a needle-punched velveteen with a weight of 180g/m per unit area²The style fabric is multipurpose for middle-end vehicle types, the surface of the fabric is fine and smooth, and the hand feeling is soft.

The weight per unit area of the glass fiber sheet 2 was 900g/m². The glass fiber plate 2 comprises from top to bottom: PE bonding layer 21 and glass fiber layer22 and a spunlace nonwoven 23.

The weight per unit area of the PE adhesive layer 21 was 50g/m². The glass fiber layer 22 is made by blending glass fiber and polypropylene fiber according to the weight ratio of (48-52) to (52-48). Wherein the melting point of the polypropylene fiber is 168 ℃. The weight per unit area of the spun-laced nonwoven fabric 23 was 45g/m². The spunlace nonwoven fabric can improve the tensile property of the glass fiber layer and avoid the situation that the glass fibers are exposed.

The preparation method of the light-weight interior trim material for the automobile rear cover comprises the following steps:

(1) and (3) processing and forming the glass fiber plate 2: adopting a needling composite process, sewing a PE bonding layer 21 on one surface of a glass fiber layer 22, and sewing a spunlace non-woven fabric 23 on the other surface;

(2) hot press molding of the surface carpet 1 and the glass fiber plate 2:

(2-1) heating and softening the glass fiber plate 2 at a high temperature, wherein the PE bonding layer 21 is softened, so that the glass fiber plate 2 and the surface carpet 1 can be bonded conveniently, placing the glass fiber plate into a forming mold, paving the surface carpet 1, and ensuring that the surface carpet 1 and the PE bonding layer 21 are bonded with each other; wherein the heating temperature for high-temperature heating softening is 220 +/-10 ℃, and the time is 150 +/-10 s.

(2-2) then, carrying out compression molding in a mold, and keeping the temperature of the mold at 18 +/-5 ℃ through a water cooling system during the compression molding, thereby finally obtaining the lightweight interior trim material for the automobile rear cover, wherein the compression molding has the molding pressure of 12 +/-2 MPa and the molding time of 60 +/-5 s. The weight of the formed part is 260-320g/0.53m²Compared with 1000g/0.92m²The left and right internal decorative parts of the rear cover of other base materials greatly reduce the weight of the parts on the premise of realizing the functions of the parts.

In the embodiment, the glass fiber is used for manufacturing, so that the performance requirements of the parts can be ensured in high-temperature experiments at 110 ℃/24h and 120 ℃/2 h.

In the embodiment, the bending strength of the material can reach 20-30MPa, and the bending modulus can reach 1800-2000 MPa;

the existing tail door trim part mainly made of PP + PET molding felt material is 1500g/m²Under the weight of the base material, the bending strength is only 7-8MPa and the bending isThe flexural modulus is only 450-550 MPa.

The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.