CN110862603A

CN110862603A - Automobile sound insulation pad skin and preparation thereof

Info

Publication number: CN110862603A
Application number: CN201911206819.2A
Authority: CN
Inventors: 钱时杰; 陈志峰
Original assignee: Shanghai Huagu Vehicle Industry Co Ltd
Current assignee: Shanghai Huagu Vehicle Industry Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-03-06

Abstract

The invention relates to an automobile sound insulation pad skin and a preparation method thereof, wherein the automobile sound insulation pad skin comprises the following components in parts by weight: 10-30 parts of a first component, 0-20 parts of polyolefin plastic, 0-45 parts of an inorganic filler, 30-85 parts of phosphorus iron powder, 0.5-2 parts of a processing aid and 0.05-1.5 parts of a thermal oxygen stabilizer, wherein the first component is a polyolefin elastomer POE, a styrene block copolymer elastomer or an oil-extended product thereof, ethylene propylene rubber or an oil-extended product thereof, EVA, EMA, TPU or TPV or a mixture of more of the polyolefin elastomer POE, the styrene block copolymer elastomer or the oil-extended product thereof, the ethylene propylene rubber or the oil-extended product thereof, the EVA, the EMA, the TPU or. Compared with the prior art, the phosphorus-iron powder is introduced into the skin formula, so that the specific gravity of the skin of the sound insulation pad is effectively increased, and the mechanical property and the temperature resistance of the sound insulation pad are ensured, so that compared with the conventional skin, the sound insulation quantity of the finally prepared skin material can be reduced by about 5db to the maximum extent or even higher under the condition of the same thickness and the same filler addition amount.

Description

Automobile sound insulation pad skin and preparation thereof

Technical Field

The invention belongs to the technical field of preparation of skins of sound insulation pads, and relates to an automobile sound insulation pad skin and preparation thereof.

Background

The automobile front wall sound insulation pad is composed of a surface layer and a PU foaming layer or cellucotton, wherein the surface layer plays a sound insulation role, and the PU foaming layer or the cellucotton plays a sound absorption role. The automobile sound insulation pad skin mainly plays a sound insulation role, and the heavier the weight of the automobile sound insulation pad per unit area is, the better the sound insulation effect is. Meanwhile, for convenience of installation, prevention of breakage, and the like, the material needs to have appropriate hardness and strength. The surface of the automobile sound insulation pad is complex in shape, large in size, 1.5 meters in length, width and height, 0.5 meter in length, width and height, the thickness of the surface is 1-3 millimeters generally, and the surface of the automobile sound insulation pad is prepared by baking, vacuum forming and trimming an elastic body plate or sheet prepared by an extrusion process according to the size and the thickness, so that the surface of the automobile sound insulation pad is one of the most effective production methods. Therefore, the material formula becomes the key of the functional effect of the automobile sound insulation pad skin.

The surface of the automobile sound insulation pad is soft. The Shore hardness is 60-85, the extrusion process is difficult to process, the material is required to have high fluidity, and simultaneously, good mechanical property and temperature resistance are required to avoid cracking, in addition, the heavier the weight of the unit area of the surface skin of the sound insulation pad is, the better the sound insulation effect is, the higher the specific gravity of the sound insulation pad is, the larger the specific gravity is generally, the larger the specific gravity is, the larger the specific gravity³Even up to 2.6g/cm³The inorganic filling amount of the material is required to be very large, generally more than 50 percent, and some of the inorganic filling amount even reaches more than 80 percent, which contradicts good mechanical property and temperature resistance. At present, calcium carbonate, barium sulfate and the like are commonly used as inorganic fillers in the surface skin of the automobile sound insulation pad, but after the inorganic fillers are added into the surface skin of the automobile sound insulation pad, the maximum specific gravity can only reach 1.8g/cm³When the sound insulation cushion exceeds the preset temperature, the mechanical property, the temperature resistance and the like of the surface of the sound insulation cushion are greatly reduced, and the use function is lost.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an automobile sound insulation pad skin and a preparation method thereof.

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

one of the technical schemes of the invention is to provide an automobile sound insulation pad skin, which comprises the following components in parts by weight: 10-30 parts of a first component (thermoplastic elastomer), 0-20 parts of a second component (polyolefin (containing benzene olefin) plastics), 30-85 parts of ferrophosphorus powder, 0-45 parts of inorganic filler, 0.5-2 parts of processing aid and 0.05-1.5 parts of thermal oxygen stabilizer, wherein,

the first component thermoplastic elastomer is specifically polyolefin elastomer POE, styrene segmented copolymer elastomer or oil-extended product thereof, ethylene propylene rubber or oil-extended product thereof, EVA, EMA, TPU or TPV or mixture of a plurality of materials.

In the invention, the oil-extended product is prepared by the following method: taking a polymer matrix (such as styrene block copolymer elastomer, ethylene propylene rubber and the like), heating in a high-speed mixer, and adding rubber filling oil to obtain the target product. The rubber filling oil is paraffin oil or naphthenic oil, and the addition amount of the rubber filling oil is 10-80% of the weight of the styrene block copolymer elastomer or the hydrogenated product thereof. The temperature of the heating treatment is 40-60 ℃, and the time of the treatment after adding the rubber filling oil is 10-20 min.

Further, the styrene block copolymer elastomer is one or more of SEBS, SIS, SEPS or SBS.

Further, the processing aid is one or more of stearic acid, zinc stearate, calcium stearate, polyethylene wax, polypropylene wax, titanate coupling agent or silane coupling agent.

Further, the thermal oxygen stabilizer is one or more of an antioxidant 1010, an antioxidant 1098, an antioxidant 1076, an antioxidant 1024, an antioxidant 168, an antioxidant 697, an antioxidant 3114, an antioxidant 1035, an antioxidant 1171, a composite antioxidant B215, a composite antioxidant B225 or a composite antioxidant B900.

Further, the sound insulation pad skin also comprises no more than 20 parts of a second component which is polyolefin (containing benzene olefin) plastic, and the second component is one or a mixture of LDPE, LLDPE, HDPE, PP or PS.

Further, the sound insulation pad skin also comprises no more than 45 parts of inorganic filler, wherein the inorganic filler is one or a compound of calcium carbonate and barium sulfate.

Further, the sound insulation pad skin also preferably comprises 0.01-1.0 part of other materials, and the other materials are one or two of carbon black or black master batch.

Furthermore, the weight portion of the ferrophosphorus powder is 30-85 parts, preferably 40-60 parts.

The second technical scheme of the invention is to provide a preparation method of the automobile sound insulation pad skin, which comprises the steps of weighing all raw materials according to the formula, uniformly mixing, adding the raw materials into a pressurized internal mixer, mixing and plasticizing, feeding the mixture into an extruder, passing through a die head, drawing and extruding to obtain an elastomer plate or sheet, and finally carrying out vacuum plastic sucking and trimming on the elastomer plate or sheet to obtain the target product, namely the automobile sound insulation pad skin.

Furthermore, the temperature for mixing and plasticizing is 160-180 ℃, and the time is 30-50 min.

Further, the vacuum forming conditions are as follows: the plastic suction time is 50-60s, and the vacuum degree is-0.06 to-0.08 MPa.

Wherein. The first component thermoplastic elastomer is used as a high polymer material for ensuring the basic functions of the surface of the sound insulation pad, and has too much content, so that the sound insulation quantity is very small, and the mechanical property is very poor. The second polymer matrix improves the strength of the sound insulating pad skin, but simultaneously improves the hardness, and the hardness cannot be too high, so the mixture ratio cannot be too high. The filling of the inorganic filler can improve the sound insulation quantity and reduce the mechanical property. Other materials such as toner (such as carbon black and the like) and color master batches (such as black master batches and the like) are added, so that the appearance color stability of the surface of the sound insulation pad can be ensured.

Compared with the prior art, the phosphorus-iron powder is introduced into the skin formula, so that the specific gravity of the skin of the sound insulation pad is effectively increased, and the mechanical property and the temperature resistance of the sound insulation pad are ensured, so that compared with the conventional skin, the sound insulation quantity of the finally prepared skin material can be reduced by about 5db to the maximum extent or even more under the same thickness and the same filler addition amount.

Detailed Description

The present invention will be described in detail with reference to specific examples. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

In the following examples, unless otherwise specified, the starting materials or the treatment techniques are all conventional and commercially available materials or conventional treatment techniques in the art.

Example (b):

the following embodiments provide a preparation method of an automobile sound insulation pad skin, and the preparation method specifically comprises the following steps:

the method comprises the following steps: all the raw materials were weighed according to table 1 below and mixed well in a mixer;

step two: adding the uniformly mixed materials into a pressure type internal mixer, mixing and plasticizing at the temperature of 160-: a first area: 160 ± 20 ℃, zone two: 175 ± 20 ℃, three zones: 175 ± 20 ℃, four zones: 170 ± 20 ℃, five zones: 165 ± 20 ℃, six zones: 165 ± 20 ℃, seven zones: 165 ± 20 ℃, eight zones: 170 ± 20 ℃, nine zones: 180 ± 20 ℃, ten zones: 185 +/-20 ℃; three-roller press polish three-roller temperature, go up roller temperature: 20-40 ℃, middle roll temperature: 75-95 ℃, lower roll temperature: 75-95 ℃;

step three: and roasting, vacuum forming and trimming the prepared plate or sheet to obtain the surface of the automobile sound insulation pad. Plastic uptake baking temperature: 200-220 ℃, baking time: 40-50s, the plastic suction time is 50-60s, and the vacuum degree is as follows: -0.06 to-0.08 Mpa.

The length, width and thickness of the finally prepared sound insulation pad skin are respectively 1000mm, 1000mm and 2 mm.

The prepared example and comparative example skins were subjected to performance tests and acoustic tests, and the results are shown in table 2 below.

TABLE 1 formulation tables (mass contents) of examples and comparative examples

Name of material

Comparative example 1

Example 1

Comparative example 2

Example 2

Example 3

Example 4

POE

12％

15％

10％

8％

EPDM

4％

8％

5％

EVA

8％

---

4％

2％

PE

5％

7％

---

3％

Barium sulfate

40％

73％

43％

---

Calcium carbonate

30％

---

Ferro-phosphorus powder

---

30％

---

30％

77％

81％

Calcium stearate

0.6％

0.5％

Antioxidant 1010

0.2％

0.3％

Carbon black

0.2％

TABLE 2 results of performance test of each example and comparative example

As can be seen from tables 1 and 2 comparing comparative example 1 with example 1, the material properties and sound insulation effect of the formulation to which the ferrophosphorus powder is added are more excellent in the case where the same amount of inorganic filler is added.

Comparing comparative example 2 with examples 3 and 4, it can be seen that the material properties and sound insulation effect of the formulation added with ferrophosphorus powder are more excellent and the sound insulation effect is better as the proportion of ferrophosphorus powder is increased under the condition of adding the same parts of inorganic filler.

Example 5-example 12

Compared to example 1, most of the same except that in this example, EPDM was replaced with SEBS, SIS, SEPS, SBS, EVA, EMA, TPU, or TPV, respectively.

The SEBS, SIS, SEPS, SBS and ethylene propylene rubber can be replaced by oil-extended products, and the specific preparation method is as follows: taking styrene block copolymer elastomers such as SEBS and the like or ethylene propylene rubber, heating to 40-60 ℃ in a high-speed mixer, adding rubber filling oil (paraffin oil) according to the mass ratio of 1:1, and processing for 10-20min to obtain an oil-filled product.

Example 13 example 14

Compared with example 1, the same is mostly true except that in this example, PE is replaced with equal quality PP or PS.

Example 15 example 20

Compared with the embodiment 1, the method is mostly the same, except that in the embodiment, the processing aid calcium stearate is replaced by stearic acid, zinc stearate, polyethylene wax, polypropylene wax, titanate coupling agent or silane coupling agent with equal mass respectively. Of course, in the above embodiments, the processing aid may be replaced by any two or more of equal-mass compound.

Example 21 example 22

See table 3 below for a specific formulation, the remainder being as in example 1.

TABLE 3

In the above embodiments, the antioxidant 1010 may be replaced by any one of or any two or more of an antioxidant 1098, an antioxidant 1076, an antioxidant 1024, an antioxidant 168, an antioxidant 697, an antioxidant 3114, an antioxidant 1035, an antioxidant 1171, a composite antioxidant B215, a composite antioxidant B225 and a composite antioxidant B900. Likewise, the weight content of the ferrophosphorus powder can be replaced by 40% or 60%.

The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims

1. The automobile sound insulation pad skin is characterized by comprising the following components in parts by weight: 10-30 parts of thermoplastic elastomer, 0-20 parts of polyolefin plastic, 0-45 parts of inorganic filler, 30-85 parts of ferrophosphorus powder, 0.5-2 parts of processing aid and 0.05-1.5 parts of thermal oxygen stabilizer, wherein,

the thermoplastic elastomer is polyolefin elastomer POE, styrene segmented copolymer elastomer or oil-filled product thereof, ethylene propylene rubber or oil-filled product thereof, EVA, EMA, TPU or TPV or mixture of a plurality of the polyolefin elastomer POE, the styrene segmented copolymer elastomer or the oil-filled product thereof.

2. The automobile sound insulation pad skin as claimed in claim 1, wherein the styrene block copolymer elastomer is one or more of SEBS, SIS, SEPS or SBS.

3. The automotive acoustic insulator mat skin of claim 1 wherein said processing aid is one or more of stearic acid, zinc stearate, calcium stearate, polyethylene wax, polypropylene wax, titanate coupling agents, or silane coupling agents.

4. The automobile sound insulation pad skin as claimed in claim 1, wherein the thermal oxygen stabilizer is one or more of antioxidant 1010, antioxidant 1098, antioxidant 1076, antioxidant 1024, antioxidant 168, antioxidant 697, antioxidant 3114, antioxidant 1035, antioxidant 1171, compound antioxidant B215, compound antioxidant B225 or compound antioxidant B900.

5. The automobile sound insulation pad skin as claimed in claim 1, wherein the polyolefin plastic is one or a mixture of LDPE, LLDPE, HDPE, PP or PS.

6. The automobile sound insulation pad skin as claimed in claim 1, further comprising no more than 45 parts of inorganic filler, wherein the inorganic filler is one or a combination of calcium carbonate and barium sulfate;

it also preferably comprises 0.01-1.0 part of other materials, and the other materials are one or two of carbon black or black master batch.

7. The automobile acoustic insulator pad skin as set forth in claim 1, wherein said ferrophosphorus powder is present in an amount of 30 to 85 parts by weight, more preferably 40 to 60 parts by weight. .

8. The method for preparing the automobile sound-insulating pad skin as claimed in any one of claims 1 to 7, wherein all the raw materials are weighed according to the formula and uniformly mixed, the mixture is added into a pressurized internal mixer for mixing and plasticizing, then the mixture is fed into an extruder to pass through a die head for traction and extrusion to prepare an elastomer plate or sheet, and finally the elastomer plate or sheet is subjected to vacuum forming and trimming to obtain the target product automobile sound-insulating pad skin.

9. The method as claimed in claim 8, wherein the mixing and plasticizing temperature is 160-180 ℃ and the time is 30-50 min.

10. The method for preparing the skin of the automobile sound insulation pad according to claim 8, wherein the vacuum forming conditions are as follows: the plastic suction time is 50-60s, and the vacuum degree is-0.06 to-0.08 MPa.