CN114410237A - High-sound-absorption stone-impact-resistant fiber composite board for protecting bottom of passenger car and preparation method thereof - Google Patents
High-sound-absorption stone-impact-resistant fiber composite board for protecting bottom of passenger car and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
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- C—CHEMISTRY; METALLURGY
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- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/122—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
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- C—CHEMISTRY; METALLURGY
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- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/10—Presence of inorganic materials
- C09J2400/14—Glass
- C09J2400/143—Glass in the substrate
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- C09J2400/00—Presence of inorganic and organic materials
- C09J2400/20—Presence of organic materials
- C09J2400/26—Presence of textile or fabric
- C09J2400/263—Presence of textile or fabric in the substrate
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- C09J2423/00—Presence of polyolefin
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- C09J2423/106—Presence of homo or copolymers of propene in the substrate
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- C09J2467/00—Presence of polyester
- C09J2467/006—Presence of polyester in the substrate
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Abstract
The invention discloses a high-sound-absorption stone-impact-resistant fiber composite board for protecting a passenger car bottom and a preparation method thereof. The internal structure of the fiber composite board is as follows in sequence: the air resistance adjusting layer comprises a high-fluidity adhesive film layer, a first non-woven fabric layer, a thermoplastic adhesive film layer, a GMT core layer and a second non-woven fabric layer, wherein the high-fluidity adhesive film layer and the first non-woven fabric layer of the fiber composite board jointly form the air resistance adjusting layer. The air resistance adjusting layer is formed by the high-fluidity adhesive film layer and the first non-woven fabric layer of the fiber composite board together, the high-fluidity adhesive film layer can show the fluidity similar to liquid after undergoing a high-temperature high-pressure composite process, so that the high-fluidity adhesive film layer is immersed into the first non-woven fabric layer, the melt index of the high-fluidity adhesive film layer and the style of the first non-woven fabric layer are adjusted, the immersion amount and the melt aperture ratio of the high-fluidity adhesive film layer are controlled, the flow resistance and the wear resistance of the surface layer of the board are further adjusted, and the purposes of controlling the sound absorption and the stone impact resistance of the board are achieved.
Description
Technical Field
The invention belongs to the field of fiber composite boards for automobile exterior parts, and particularly relates to a high-sound-absorption stone-impact-resistant fiber composite board for protecting a passenger car bottom and a preparation method thereof.
Background
The automobile bottom protecting part is used to protect the chassis, engine and oil pipeline from the impact of wind, stone, water flow, etc. and some special material can eliminate part of noise from the bottom of automobile.
At present, automobile bottom protection materials are roughly divided into three types: traditional metal molded parts, LFT-D injection molded parts, GMT materials. The first two are heavy dense materials, which have advantages in absolute rigidity. However, with the increasing energy crisis in modern society, the trend of light weight is inevitable, and the material with the density of only 1/3GMT not only has light weight, but also has specific strength superior to that of the traditional bottom protection material.
As people gradually explore the advantages of GMT materials in the bottom shield parts, more and more material suppliers begin to develop and produce GMT bottom shields, so that the market competition is more and more intense.
GMT is a porous material which can be randomly compressed and shaped, theoretically has better sound absorption performance, but GMT bottom guard plates with high sound absorption additional value do not appear on the market at present, and people are always studying how to exert the sound absorption performance of the material.
Therefore, through theoretical research of a system, a special structure and a special process are developed, great significance is achieved for exploring the potential and the limit of GMT sound absorption, and the performance advantage attribute of the GMT material is improved to a new level.
Disclosure of Invention
The GMT material has a plurality of pore structures in a core layer, so that the GMT material has the basic condition of being used as an excellent sound-absorbing material, but has the defects of too good air permeability, small flow resistance and relatively poor sound-absorbing performance of each frequency.
The invention is realized by the following technical scheme:
the invention discloses a high-sound-absorption stone-impact-resistant fiber composite board for protecting a passenger car bottom, which sequentially comprises the following internal structures: the high-fluidity adhesive film layer, the first non-woven fabric layer, the thermoplastic adhesive film layer, the GMT core layer and the second non-woven fabric layer. Wherein fibre composite board's high mobility glued membrane layer and first non-woven fabrics layer both constitute the air lock regulating layer jointly, the high mobility glued membrane layer can demonstrate the mobility of similar liquid after the high-temperature high-pressure combined process of experience, thereby make it soak among the first non-woven fabrics layer, thereby through adjusting the immersion volume and the melting aperture ratio of control high mobility glued membrane layer melt index and the style of first non-woven fabrics layer, and then adjust the flow resistance and the wearability on panel top layer, thereby play the purpose of the sound absorption of control panel and resistant stone hit performance.
As a further improvement, the surface density of the high-fluidity adhesive film layer is in the range of 30-200g/m2The melt index is 80-300g/10min, the glue film can be screened according to the immersion amount and the opening rate, and the glue film component can be one or more of PP, PE, PET, PES, PA and EVA.
As a further improvement, the first non-woven fabric layer and/or the second non-woven fabric layer has the area density ranging from 80 to 200g/m2A fiber fineness in the range of 1.5-9Dtex, and fiber types comprising thermoplastic synthetic fibers, PET fibers, LPET fibers, PES fibers, PP-The PET skin-core structure fiber and the PES/PET skin-core structure fiber can be one or more of needle-punched non-woven fabric, spunlaced non-woven fabric, hot-rolled non-woven fabric, spun-bonded non-woven fabric and melt-blown non-woven fabric, and can be screened according to the immersion amount and the aperture ratio.
As a further improvement, the GMT core layer is a thermoplastic synthetic fiber and glass fiber GF composite core material.
As a further improvement, the area density of the high sound absorption plate of the invention is in the range of 1000-1800g/m2The thickness range is 3-7 mm.
The invention also discloses a preparation method of the high sound absorption stone-impact resistant fiber composite board for protecting the passenger car bottom, which comprises the steps of opening, mixing, carding, needling and the like of thermoplastic synthetic fibers and glass fibers GF to obtain a GMT (polyethylene glycol terephthalate) roll-shaped core layer, wherein a second non-woven fabric layer is coated on the surface of a felt material before the needling process, enters needling equipment along with the felt material, is fixed on the surface of the GMT roll-shaped core layer after high-speed consolidation of a felting needle, is baked in a high-temperature oven to fully melt and plasticize the thermoplastic synthetic fibers, is sequentially coated with a thermoplastic adhesive film layer, a first non-woven fabric layer and a high-fluidity adhesive film on the surface of the GMT roll-shaped core layer, and is then rolled and pressed at high temperature to be cooled and shaped to obtain the fiber composite board, wherein the average flow resistance of the prepared fiber composite board is 800-2500Pa s.m-3An interval. .
The average flow resistance interval of 800-2500 Pa.s.m can be obtained by selecting the melt index of the surface layer high-fluidity adhesive film and the style of the first non-woven fabric layer and combining the adjustment of the production process-3The high sound absorption and stone impact resistant fiber composite board can meet the requirements of various main engine plants in the automobile industry on the mainstream index of the 400-plus-8000 Hz sound absorption coefficient reverberation test and various types of broken stone impact resistance indexes.
As a further improvement, the gram weight range of the high-fluidity adhesive film is 60-90g/m2The melt index is 200-300g/10min, and the component is PP; the first non-woven fabric layer and the second non-woven fabric layer preferably have a density in the range of 80-120g/m2Needle punched cloth with fine fiberThe degree range is 1.5-4Dtex, and the fiber type can be LPET fiber or PET fiber; the layer density of the thermoplastic adhesive film is preferably 25-35g/m2The component is PE or EVA, the flow resistance target range can be realized by adopting the combination of the components of 800-1200 Pa.s.m-3The sound absorption performance and the broken stone impact resistance standard of the Jili automobile can be passed under the flow resistance range.
As a further improvement, the gram weight range of the preferentially selected surface layer high-fluidity adhesive film is 45-60g/m2The melt index is 120-200g/10min, and the component is PP or PES; the layer density of the first non-woven fabric layer and the second non-woven fabric layer is preferably selected to be in the range of 120-150g/m2The fiber fineness range is 4-7Dtex, and the fiber type can be PP/PET skin-core structure fiber; the layer density of the thermoplastic adhesive film is preferably 35-45g/m2The component is PP or PES, the flow resistance target range of 1200-1800Pa s.m can be realized by adopting the combination-3The sound absorption performance and the broken stone impact resistance standard of Toyota automobiles can be passed under the flow resistance range.
As a further improvement, the gram weight range of the high-fluidity adhesive film of the selected surface layer is 30-45g/m2The melt index is 80-120g/10min, and the component is PA. The layer density of the first non-woven fabric layer and the second non-woven fabric layer is preferably selected to be in the range of 150-2The fiber fineness range is 7-9Dtex, and the fiber type can be PP/PET skin-core structure fiber; the layer density of the thermoplastic adhesive film is preferably selected to be 45-60g/m2The component is PA, and the flow resistance target range of 1800 + 2500Pa s.m can be realized by adopting the combination-3The sound absorption performance and the broken stone impact resistance standard of the BMW automobile can be passed under the flow resistance range.
The invention has the following beneficial effects:
1. the air resistance adjusting layer is formed by the high-fluidity adhesive film layer and the first non-woven fabric layer of the fiber composite board together, the high-fluidity adhesive film layer can show the fluidity similar to liquid after undergoing a high-temperature high-pressure composite process, so that the high-fluidity adhesive film layer is immersed into the first non-woven fabric layer, the melt index of the high-fluidity adhesive film layer and the style of the first non-woven fabric layer are adjusted, the immersion amount and the melt aperture ratio of the high-fluidity adhesive film layer are controlled, the flow resistance and the wear resistance of the surface layer of the board are further adjusted, and the purposes of controlling the sound absorption and the stone impact resistance of the board are achieved.
2. The invention finds a high-sound-absorption stone-impact-resistant fiber composite board for protecting a passenger car bottom and a preparation method thereof, aiming at different frequencies, the flow resistance characteristic of the surface of the high-sound-absorption board can be controlled through the change combination of the surface layer adhesive film and the type of non-woven fabric, the average flow resistance interval can be respectively in 800-2500 Pa.s.m.-3The high sound absorption and stone impact resistant fiber composite board can meet the requirements of various main engine plants in the automobile industry on the mainstream index of the 400-plus-8000 Hz sound absorption coefficient reverberation test and various types of broken stone impact resistance indexes; the final flow resistance of the porous sound absorption board is respectively controlled to be 800-1200Pa s.m-3、1200-1800Pa·s·m-3And 1800 ion 2500Pa s m-3And the porous sound absorption plate with ideal sound absorption coefficient in each frequency band can be obtained. The area density range of the fiber composite board is 1000-1800g/m2Compared with the traditional metal fiber sound absorption material for the vehicle, the core layer is light by about 3-4kg, has the advantages of light weight and simple and convenient forming, and can be prepared into various products with complex shapes according to different forming requirements because the core layer main body is made of thermoplastic material.
3. The fiber composite board core layer has a large number of three-dimensional cavities which are communicated with each other and are connected with the outside, so that the porous sound-absorbing board has the functions of heat preservation, mildew prevention and moisture prevention while having high sound absorption and high air permeability.
4. The fiber composite board adopts a high-fluidity hot melt adhesive film as a surface layer, adopts multi-component thermoplastic fiber non-woven fabric as a matrix, and is pressed after being compounded with a GMT core layer at a high temperature to obtain the final high-sound-absorption composite board. Because can change the specification parameter of adjusting top layer glued membrane and basic unit non-woven fabrics according to the demand to combine the technology change of equipment complex, can prepare the combined material of different appearance styles and it possesses different function emphasis nature: the surface layer has less glue residue, the appearance style is closer to a non-woven fabric state, the sound absorption performance of the final part is more favorable for high frequency, and the influence of collision noise caused by impact of foreign matters such as stones on the chassis can be weakened; the surface glue amount is remained much, the appearance style is more close to the glue film state, the sound absorption performance of the final part is more favorable for low frequency, and the part has better water and oil proofing and foreign matter impact resistance.
5. The melt index of the high-fluidity adhesive film is preferably 80-300g/10min, and the melt index is too low, so that the hot-melt adhesive film cannot be fully infiltrated with the surface of a fiber felt to cause layering, and poor bonding is caused; the problem of glue leakage on the surface of the non-woven fabric is easily caused due to the fact that the melt index is too high, and the sound absorption and stone impact resistance effect is optimal when 80-300g/10min is adopted.
6. In the preparation method, the heating temperature of the tunnel oven is between 200 and 230 ℃, so that the thermoplastic fiber can be fully baked and plasticized; the compounding temperature is between 170 and 230 ℃, the heating time is 1-3min, and the tunnel oven can be used for baking.
7. In the preparation method, the range of the gap between the upper plate and the lower plate of the compound machine is selected to be 3-7 mm. Under the clearance range, the prepared plate has better pores, can ventilate and achieves better sound absorption effect.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a graph showing the results of an Alpha-bin test according to one embodiment of the present invention;
FIG. 3 is a graph showing the results of a two Alpha-bin test according to an embodiment of the present invention;
FIG. 4 is a diagram showing the results of the triple Alpha-bin test according to the embodiment of the present invention.
In fig. 1, 1 is a high flow adhesive film layer, 2 is a first nonwoven fabric layer, 3 is a thermoplastic adhesive film layer, 4 is a GMT core layer, and 5 is a second nonwoven fabric layer.
Detailed Description
The invention discloses a high-sound-absorption stone-impact-resistant fiber composite board for protecting a passenger car bottom and a preparation method thereof, wherein the figure 1 is a schematic structural diagram of the high-sound-absorption stone-impact-resistant fiber composite board, and the internal relative structure of the composite board is sequentially a high-fluidity adhesive film layer 1, a first non-woven fabric layer 2, a thermoplastic adhesive film layer 3, a GMT core layer 4 and a second non-woven fabric layer 5.
The surface density of the high-fluidity adhesive film layer 1 ranges from 30 to 200g/m2The melt index is 80-300g/10min, and the adhesive film contains one or more of PP, PE, PET, PES, PA and EVA.
The first nonwoven fabric layer 2 and/or the second nonwoven fabric layer 5 have an areal density in the range of 80 to 200g/m2The fineness of the fiber is 1.5-9Dtex, the fiber type comprises one or more of thermoplastic synthetic fiber, PET fiber, LPET fiber, PES fiber, PP/PET skin-core structure fiber and PES/PET skin-core structure fiber, and the first nonwoven fabric layer 2 and/or the second nonwoven fabric is one of needle-punched nonwoven fabric, spunlace nonwoven fabric, hot-rolled nonwoven fabric, spun-bonded nonwoven fabric and melt-blown nonwoven fabric.
The GMT core layer 4 is a thermoplastic synthetic fiber and glass fiber GF composite core material.
The surface density of the high sound absorption plate is in the range of 1000-2The thickness range is 3-7 mm.
The flow resistance range of the porous sound-absorbing board is controlled to be 800--3Within. The preparation process of the high sound absorption fiber composite board comprises the following steps: uniformly mixing thermoplastic polypropylene fibers and glass fibers in proportion, carding, lapping and needling to prepare a blended GMT fiber felt, placing the GMT felt material in a high-temperature oven, taking the GMT felt material out of the oven after the polypropylene is fully melted, sequentially coating auxiliary materials such as a glue film, non-woven fabrics and the like on the surface, placing the mixture in a high-temperature compounding machine, and obtaining the high-sound-absorption fiber composite board after compounding. Oven temperature range: the temperature of the compound machine is 230 ℃ at 200-3. The purpose of adjusting the flow resistance is achieved by adjusting the components and the combination of the high-fluidity adhesive film layer 1, the first non-woven fabric layer 2 and the thermoplastic adhesive film layer 3.
The technical scheme of the invention is further explained by combining the specific embodiment as follows:
the first embodiment is as follows:
the Girissin-Yuehu-L automobile bottom protection high-sound-absorption fiber composite board has the bulk density of 0.32g/cm3Thickness of the plate5mm, FIG. 2 is a schematic diagram of the Alpha-bin test results of an embodiment of the present invention; the diamond is the target value, and the Alpha-Cabin reverberation chamber test standard is: 400Hz is more than or equal to 0.2; 500Hz is more than or equal to 0.30; 630Hz is more than or equal to 0.40; 800Hz is more than or equal to 0.5; 1000Hz is more than or equal to 0.6; 1250Hz is more than or equal to 0.7; 1600Hz is more than or equal to 0.8; 2000-8000Hz of more than or equal to 0.85.
The preparation method comprises the following steps:
and uniformly mixing the thermoplastic polypropylene fibers and the glass fibers in proportion, and carding, lapping and needling to obtain the GMT core material.
And (3) heating the GMT core material in an oven at the temperature of 200-185 ℃, wherein the baking time is 3-5min, sticking the thermoplastic adhesive film layer 3, the first non-woven fabric layer 2 and the high-fluidity adhesive film on the surface of the GMT core material after the GMT core material is taken out of the oven, and putting the material into a high-temperature compounding machine at the temperature of 170-185 ℃. And cooling and forming to obtain the high sound absorption fiber composite board.
The gram weight range of the surface layer high-fluidity adhesive film is preferably selected to be 60g/m2The melt index is 270g/10min, and the component is PE; preferably, the areal density ranges of the first nonwoven fabric layer 2 and the second nonwoven fabric layer 5 are both 80g/m2The fiber fineness range is 3Dtex, and the fiber type is LPET fiber; the surface density of the thermoplastic film layer 3 is preferably 25g/m2The component is PE. Finally controlling the flow resistance target range of 800-1200Pa s-m-3The above Alpha-Cabin reverberation chamber test standard requirements can be met under the conditions of the structure and the flow resistance.
Measuring the flow resistance by using a portable flow resistance instrument according to the GB-T25077-2010 acoustic porous sound-absorbing sheet material flow resistance measurement test standard, wherein the flow resistance measurement range of the embodiment conforms to 800-1200Pa s-m-3The average flow resistance measurement result is 948 Pa.s/m-3(ii) a According to the national standard GB-T18696.2-2002 'measuring part 2. transfer function method of sound absorption coefficient and sound impedance in an acoustic impedance tube', normal sound absorption coefficient measurement is carried out through the acoustic impedance tube; according to the sound absorption test standard of the GB-T20247-2006 acoustic reverberation chamber, sound absorption coefficient measurement is carried out by using an Alpha-Cabin reverberation chamber, and specific data are shown in Table 1.
TABLE 1 flow resistance 800-
Example two:
a Toyota senna type bottom guard high sound absorption fiber composite board has a bulk density of 0.19g/m3The thickness of the plate is 7mm, and FIG. 3 is a schematic diagram of the test result of the second Alpha-cassette according to the embodiment of the present invention; diamond is the target value, Alpha-Cabin reverberation chamber test standard: 500Hz is more than or equal to 0.3; 630Hz is more than or equal to 0.4; 800Hz is more than or equal to 0.5; 1000Hz is more than or equal to 0.6; 1250Hz is more than or equal to 0.7; 1600Hz is more than or equal to 0.8; 2000Hz is more than or equal to 0.9.
And uniformly mixing the thermoplastic polypropylene fibers and the glass fibers in proportion, and carding, lapping and needling to obtain the composite fiber felt 2.
And (3) putting the GMT fiber felt 2 into an oven for heating, wherein the temperature of the oven is 210-220 ℃. And then, putting the fiber felt 2 into a high-temperature compound machine, wherein the temperature of the compound machine is 195-210 ℃, and cooling and forming to obtain the GMT composite board 2.
The gram weight range of the surface layer high-fluidity adhesive film is preferably selected to be 60g/m2The melt index is 175g/10min, and the component is PES; the first nonwoven fabric layer 2 and the second nonwoven fabric layer 5 are preferably selected to have an areal density in the range of 120g/m2The fiber fineness range is 6Dtex, and the fiber type is PP/PET skin-core structure fiber; the surface density of the thermoplastic film layer 3 is preferably 35g/m2The component is PES. Finally controlling the flow resistance target range 1200-1800Pa s-m-3The above Alpha-Cabin reverberation chamber test standard requirements can be met under the conditions of the structure and the flow resistance.
According to the GB-T25077-2010 acoustic porous sound-absorbing sheet material flow resistance measurement test standard, the flow resistance is measured by using a portable flow resistance instrument, and the flow resistance measurement range of the embodiment conforms to the flow resistance measurement range of 1200-1800Pa s.m-3The average flow resistance measurement result was 1532 pas/m-3(ii) a According to the national standard GB-T18696.2-2002Acoustic absorption coefficient and acoustic impedance measurement in acoustic impedance tubes section 2 transfer function methods, which measure normal acoustic absorption coefficient through acoustic impedance tubes; according to the sound absorption test standard of the GB-T20247-2006 acoustic reverberation chamber, sound absorption coefficient measurement is carried out by using an Alpha-Cabin reverberation chamber, and specific data are shown in Table 2.
TABLE 2 flow resistance 1200-
Example three:
a BMW X3 automobile bottom protection high sound absorption fiber composite board with the bulk density of 0.2g/m3The thickness of the plate is required to be 7mm, and FIG. 4 is a schematic diagram of the test result of the triple Alpha-cassette according to the embodiment of the present invention; diamond is the target value, and the result requirement of the Alpha-Cabin reverberation chamber is as follows: 400Hz is more than or equal to 0.25; 500Hz is more than or equal to 0.35; 630Hz is more than or equal to 0.45; 800Hz is more than or equal to 0.55; 1000Hz is more than or equal to 0.65; 1250Hz-5000Hz is more than or equal to 0.75; 6300Hz is not less than 0.7; 8000Hz is more than or equal to 0.65.
And uniformly mixing the thermoplastic polypropylene fibers and the glass fibers in proportion, and carding, lapping and needling to obtain the composite fiber felt 2.
And (3) putting the GMT fiber felt 2 into an oven for heating, wherein the temperature of the oven is 220-230 ℃. And then, putting the fiber felt 2 into a high-temperature compound machine, wherein the temperature of the compound machine is 210-230 ℃, and cooling and forming to obtain the GMT composite board 2.
The gram weight range of the surface layer high-fluidity adhesive film is preferably selected to be 90g/m2The melt index was 80g/10min, and the component was PA. The first nonwoven fabric layer 2 and the second nonwoven fabric layer 5 are preferably selected to have an areal density in the range of 200g/m2The fiber fineness range is 9Dtex, and the fiber type is PP/PET skin-core structure fiber; the surface density of the thermoplastic film layer 3 is preferably 60g/m2The component is PA. The flow resistance target range of 1800 and 2500Pa s.m can be realized-3The high sound absorption fiber composite board has ideal sound absorption performance, and the Alpha-Cabin reverberation test result can reach the standard.
Flow resistance measurement of acoustic porous sound-absorbing sheet material according to GB-T25077-The measurement standard is that the portable flow resistance instrument is used for measuring the flow resistance, and the flow resistance measurement range of the embodiment conforms to 1800 + 2500 Pa.s.m-3Average flow resistance measurement of 2175 pas/m-3(ii) a According to the national standard GB-T18696.2-2002 'measuring part 2. transfer function method of sound absorption coefficient and sound impedance in an acoustic impedance tube', normal sound absorption coefficient measurement is carried out through the acoustic impedance tube; according to the sound absorption test standard of the GB-T20247-2006 acoustic reverberation chamber, sound absorption coefficient measurement is carried out by using an Alpha-Cabin reverberation chamber, and specific data are shown in Table 3.
TABLE 3 flow resistance 1800 + 2500 sound absorption data
Finally, it should also be noted that the above-mentioned list is only a specific embodiment of the invention. It is obvious that the invention is not limited to the above embodiments, but that many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (10)
1. The utility model provides a protect at bottom of passenger car with high resistant stone of inhaling sound hits fiber composite board, its characterized in that, fiber composite board structure from the top down be in proper order: the high-fluidity adhesive film layer (1), the first non-woven fabric layer (2), the thermoplastic adhesive film layer (3), the GMT core layer (4) and the second non-woven fabric layer (5).
2. The high sound absorption and stone-impact resistant fiber composite board for protecting the bottom of a passenger car as claimed in claim 1, wherein the surface density of the high-fluidity adhesive film layer (1) is in the range of 30-200g/m2The melt index is in the range of 80-300g/10 min.
3. The high sound absorption and stone chip resistant fiber composite board for protecting the bottom of a passenger car as claimed in claim 2, wherein the adhesive film component is one or more of PP, PE, PET, PES, PA and EVA.
4. The high sound absorption and stone-impact resistant fiber composite board for protecting passenger car bottom according to claim 1, 2 or 3, characterized in that the first nonwoven fabric layer (2) and/or the second nonwoven fabric layer (5) has an areal density in the range of 80-200g/m2The fiber fineness is 1.5-9Dtex, the fiber type comprises one or more of thermoplastic synthetic fibers, PET fibers, LPET fibers, PES fibers, PP/PET skin-core structure fibers and PES/PET skin-core structure fibers, and the first non-woven fabric layer (2) and/or the second non-woven fabric layer (5) is one of needle-punched non-woven fabrics, spunlace non-woven fabrics, hot-rolled non-woven fabrics, spun-bonded non-woven fabrics and melt-blown non-woven fabrics.
5. The high sound absorption and stone chip resistant fiber composite board for protecting the bottom of a passenger car as claimed in claim 4, wherein the GMT core layer (4) is a thermoplastic synthetic fiber and glass fiber GF composite core material.
6. The high sound absorption and stone-impact resistant fiber composite board for protecting bottom of passenger car as claimed in claim 1, 2, 3 or 5, wherein the area density of the high sound absorption board is in the range of 1000-1800g/m2The thickness range is 3-7 mm.
7. A method for preparing the high sound absorption and stone chip resistant fiber composite board for protecting the bottom of a passenger car as claimed in claim 1, 2, 3 or 5 is characterized in that a GMT roll-shaped core layer is prepared by opening, mixing, carding, needling and the like of thermoplastic synthetic fibers and glass fibers GF, then the GMT roll-shaped core layer is baked by a high-temperature oven to fully melt and plasticize the thermoplastic synthetic fibers, a thermoplastic film layer (3), a first non-woven fabric layer (2) and a high-fluidity adhesive film (1) are sequentially adhered on the surface layer of the GMT roll-shaped core layer, then the GMT roll-shaped core layer is subjected to high-temperature rolling and pressing, and is cooled and shaped to obtain the fiber composite board, and the average flow resistance of the prepared fiber composite board is 800-2500Pa s-m.m.-3An interval.
8. The high sound absorption and stone-impact resistant fiber composite for protecting passenger car bottom according to claim 7The preparation method of the composite board is characterized in that the gram weight range of the high-fluidity adhesive film (1) is 60-90g/m2The melt index is 200-300g/10min, and the component is PP; the areal density ranges of the first non-woven fabric layer (2) and the second non-woven fabric layer (5) are 80-120g/m2The needle-punched cloth has the fiber fineness ranging from 1.5 to 4Dtex and the fiber type of LPET fiber or PET fiber; the surface density of the thermoplastic film layer (3) is 25-35g/m2The component is PE or EVA, the target range of the flow resistance is 800-1200Pa s.m-3。
9. The preparation method of the high sound absorption and stone-impact resistance fiber composite board for protecting the bottom of the passenger car as claimed in claim 7, wherein the gram weight range of the high-fluidity adhesive film (1) is 45-60g/m2The melt index is 120-200g/10min, and the component is PP or PES; the surface density ranges of the first non-woven fabric layer (2) and the second non-woven fabric layer (5) are 120-150g/m2The fiber fineness range is 4-7Dtex, and the fiber type is PP/PET skin-core structure fiber; the surface density of the thermoplastic film layer (3) is 35-45g/m2The component is PP or PES, and the flow resistance target range achieved is 1200-1800 Pa.s.m-3。
10. The preparation method of the high sound absorption and stone-impact resistance fiber composite board for protecting the bottom of the passenger car as claimed in claim 7, wherein the gram weight range of the high-fluidity adhesive film (1) is 30-45g/m2The melt index is 80-120g/10min, and the component is PA; the surface density ranges of the first non-woven fabric layer (2) and the second non-woven fabric layer (5) are 150-2The fiber fineness range is 7-9Dtex, and the fiber type is PP/PET skin-core structure fiber; the surface density of the selected thermoplastic film layer (3) is 45-60g/m2The component is PA, and the realized flow resistance target range is 1800 and 2500 Pa.s.m-3。
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| CN105383102A (en) * | 2015-12-21 | 2016-03-09 | 浙江华江科技股份有限公司 | Expandable high-bonding and high-sound-absorption paper honeycomb composite board and manufacturing method thereof |
| CN205467724U (en) * | 2016-01-19 | 2016-08-17 | 广州金发碳纤维新材料发展有限公司 | Composite plate |
| KR20190022973A (en) * | 2017-08-24 | 2019-03-07 | 주식회사 무진 | Fiber composite material for under cover of vehicle |
| CN111016816A (en) * | 2019-12-31 | 2020-04-17 | 浙江华江科技股份有限公司 | Flow resistance controllable high-sound-absorption bottom guard plate porous sound-absorption plate for vehicle and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105383102A (en) * | 2015-12-21 | 2016-03-09 | 浙江华江科技股份有限公司 | Expandable high-bonding and high-sound-absorption paper honeycomb composite board and manufacturing method thereof |
| CN205467724U (en) * | 2016-01-19 | 2016-08-17 | 广州金发碳纤维新材料发展有限公司 | Composite plate |
| KR20190022973A (en) * | 2017-08-24 | 2019-03-07 | 주식회사 무진 | Fiber composite material for under cover of vehicle |
| CN111016816A (en) * | 2019-12-31 | 2020-04-17 | 浙江华江科技股份有限公司 | Flow resistance controllable high-sound-absorption bottom guard plate porous sound-absorption plate for vehicle and preparation method thereof |
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