CN112625334A - Impact-resistant automobile front wall sound insulation pad and preparation method thereof - Google Patents
Impact-resistant automobile front wall sound insulation pad and preparation method thereof Download PDFInfo
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- CN112625334A CN112625334A CN202011505309.8A CN202011505309A CN112625334A CN 112625334 A CN112625334 A CN 112625334A CN 202011505309 A CN202011505309 A CN 202011505309A CN 112625334 A CN112625334 A CN 112625334A
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- 238000009413 insulation Methods 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
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- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 82
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 82
- 241001330002 Bambuseae Species 0.000 claims abstract description 82
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 82
- 239000011425 bamboo Substances 0.000 claims abstract description 82
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000011347 resin Substances 0.000 claims abstract description 15
- 229920005989 resin Polymers 0.000 claims abstract description 15
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 13
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 13
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 7
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- 210000000988 bone and bone Anatomy 0.000 claims description 40
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- 238000003763 carbonization Methods 0.000 claims description 22
- 238000001816 cooling Methods 0.000 claims description 18
- 238000005303 weighing Methods 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 15
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims description 14
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000000498 ball milling Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 12
- 230000008018 melting Effects 0.000 claims description 12
- 238000004321 preservation Methods 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 230000010355 oscillation Effects 0.000 claims description 10
- 108091005804 Peptidases Proteins 0.000 claims description 8
- 239000004365 Protease Substances 0.000 claims description 8
- 102100037486 Reverse transcriptase/ribonuclease H Human genes 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
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- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 description 16
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Abstract
The invention relates to an impact-resistant automobile front wall sound insulation pad and a preparation method thereof, and belongs to the technical field of automobile part preparation. According to the invention, the EVA resin and the polyethylene glycol terephthalate are used as raw materials, and the modified porous pig bone charcoal and the modified bamboo fiber are added to prepare the sound insulation pad, so that the sound insulation performance and the impact resistance of the finally prepared sound insulation pad are greatly improved, and the sound insulation pad has a wide application prospect.
Description
Technical Field
The invention relates to an impact-resistant automobile front wall sound insulation pad and a preparation method thereof, and belongs to the technical field of automobile part preparation.
Background
At present, the automotive interior parts are generally arranged on the top of an automobile, a trunk and under a floor to play roles of heat insulation, sound insulation, beauty, sound absorption and the like. In the era of pursuing high performance, environmental protection, energy saving, light weight and individuation, the interior trim of the automobile is the same as the appearance of the automobile, and becomes an important factor for people to select and purchase the automobile. Therefore, the demand for automotive interior parts is also increasing.
In the prior art, the performance indexes of the front wall sound insulation pad, such as high sound absorption property, low gram weight, high strength and the like, become the bottleneck of the development of the interior trim parts, and restrict the development of the front wall sound insulation pad. Enclose before present and give sound insulation and fill up most adoption heavy coat adsorption molding alone and the laminating of gluing is beaten to the cotton felt, its shortcoming is: 1) the sound absorption performance index can not meet the requirement; 2) the product has heavy weight, which is not beneficial to the light weight and energy saving of the whole vehicle; 3) the product has poor strength, and is easy to deform especially for long products.
In view of the above-mentioned drawbacks, the present inventors have made active research and innovation to create an impact-resistant sound insulation pad for automobile front wall and a method for manufacturing the same, so that the impact-resistant sound insulation pad has industrial application value.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide an impact-resistant automobile front wall sound insulation pad and a preparation method thereof.
The invention discloses an impact-resistant automobile front wall sound insulation pad which comprises the following raw materials in parts by weight:
35-40 parts of EVA resin;
15-20 parts of polyethylene terephthalate;
1-3 parts of sodium dodecyl sulfate;
2-4 parts of hydroxyethyl acrylate;
10-15 parts of porous pig bone charcoal;
15-20 parts of bamboo fiber;
the porous pig bone charcoal is prepared by carrying out enzymolysis on pig bones, water and protease and then carbonizing.
Further, the porous pig bone charcoal can also be modified porous pig bone charcoal;
the modified porous pig bone charcoal is prepared by reacting straw and porous pig bone charcoal.
Further, the bamboo fiber can also be modified bamboo fiber;
the modified bamboo fiber is prepared by reacting bamboo fiber and sodium hydroxide solution at high temperature and high pressure.
Further, the preparation method of the porous pig bone charcoal comprises the following steps:
(1) weighing pig bones, cleaning, then putting the pig bones into a grinder, grinding to obtain pig bone crushed materials, mixing the pig bone crushed materials, water and protease according to the mass ratio of 10:100:3, then putting the mixture into an enzymolysis tank, carrying out heat preservation and enzymolysis for 10-12 hours at the temperature of 35-40 ℃, and obtaining enzymolysis crushed materials after the enzymolysis is finished; the protein components in the pig bones are subjected to enzymolysis through enzymolysis, so that the porosity and the surface roughness of the crushed pig bones are improved;
(2) and (3) putting the obtained enzymolysis crushed material into a carbonization furnace, heating to 300-400 ℃ under the protection of nitrogen, carrying out heat preservation carbonization for 3-4 h, and obtaining the porous pig bone charcoal after carbonization. Obtaining pig bone charcoal with high porosity and rough surface through carbonization;
further, the preparation method of the modified porous pig bone charcoal comprises the following steps:
weighing straws, putting the straws into a ball milling crusher, performing ball milling crushing treatment for 1-2 hours, then sieving the straws with a 200-mesh sieve, collecting sieved straw powder, mixing the sieved straw powder and porous pig bone charcoal according to a mass ratio of 1:2, putting the mixture into an ultrasonic oscillator, and performing ultrasonic oscillation treatment for 3-5 hours at a frequency of 25-30 kHz to obtain the modified porous pig bone charcoal. Make the tiny straw fibre after smashing adsorb the setting in the inside hole of porous pig bone charcoal through ultrasonic oscillation processing, use this as the filler, prepare the sound insulation pad, because pig bone charcoal has a large amount of inside and outside little pores and the hole of intercommunication, when the sound wave incides modified pig bone charcoal on the surface, the sound wave can be inside along the pore admission material, arouse the vibration of air molecule and inside adsorbed tiny straw powder in the space, because the viscous drag of air and the vibration friction of air molecule and pore wall and tiny straw fibre, sound energy conversion is heat energy and loss, consequently, reduce the sound energy, the splendid sound insulation effect that plays.
Further, the preparation steps of the modified bamboo fiber are as follows:
mixing bamboo fiber with a sodium hydroxide solution with the mass fraction of 5% according to the mass ratio of 1:10, putting the mixture into a high-temperature reaction kettle, heating to 200-250 ℃, pressurizing to 1.2-1.3 Mpa, reacting for 3-5 h at high temperature and high pressure, and after the reaction is finished, filtering and separating to obtain filter residue to obtain the modified bamboo fiber. Firstly, raw bamboo fiber is taken as a raw material, organic acid is separated from hemicellulose in the raw bamboo fiber through hydrothermal action of high-temperature high-pressure alkali boiling, the organic acid further promotes cellulose hydrolysis, furfural is generated due to hydrolysis, the generated furfural is further condensed to form a polymer under high-pressure conditions, the raw bamboo fiber is resinified, the bamboo fiber resinified in sequence is taken as a filler to prepare the sound insulation pad, on one hand, the modified bamboo fiber keeps the original structural characteristics of the modified bamboo fiber, namely, the modified bamboo fiber has transverse joints in the longitudinal direction and uneven thickness distribution, numerous fine grooves are formed on the surface of the fiber, the fiber is in an oval shape and a round waist shape in the transverse direction, a middle cavity is arranged in the fiber, gaps with large sizes and small sizes are distributed on the cross section, cracks are formed on the edge, the fiber structure of the raw bamboo fiber is firstly modified, so that the transmission path of sound waves transmitted from the outside, The existence of the groove and the crack, viscous resistance and vibration friction are generated between the groove and the introduced sound wave, the sound energy is converted into heat energy to be lost, the sound energy is reduced, and the sound insulation effect is achieved;
the preparation steps of the impact-resistant automobile front wall sound insulation pad are as follows:
(1) weighing 35-40 parts of EVA resin, 15-20 parts of polyethylene glycol terephthalate, 1-3 parts of sodium dodecyl sulfate, 2-4 parts of hydroxyethyl acrylate, 10-15 parts of modified porous pig bone charcoal and 15-20 parts of modified bamboo fiber in parts by weight;
(2) uniformly stirring modified bamboo fibrils and polyethylene glycol terephthalate at normal temperature to obtain a main material, mixing sodium dodecyl sulfate and the main material, melting the mixture into colloid in a glue melting machine at 240 ℃, cooling to 50 ℃ to obtain a secondary main material, adding EVA resin, hydroxyethyl acrylate and modified porous pig bone charcoal into the secondary main material, placing the mixture in an internal mixer for internal mixing for 15-20 min at the temperature of 95 ℃, cooling to normal temperature, injecting the mixture into a steam hot-pressing mold for sealing, introducing high-pressure steam to 0.07MPa, keeping the pressure for 1min, unloading the pressure, cooling and opening the mold to obtain the impact-resistant automobile front wall sound insulation pad. Through mixing, and the micro-pore mechanism is generated inside the sound insulation pad under the action of the surfactant, and the pores are utilized to play the roles of impact resistance buffering and sound insulation, so that the impact resistance and the sound insulation performance of the sound insulation pad are further improved.
By the scheme, the invention at least has the following advantages:
(1) according to the method, protein components in pig bones are subjected to enzymolysis through enzymolysis, so that the porosity and surface roughness of pig bone fragments are improved, pig bone charcoal with high porosity and rough surface is obtained through carbonization, crushed fine straw fibers are adsorbed and fixed in the inner pores of porous pig bone charcoal through ultrasonic oscillation treatment, the pig bone charcoal is used as a filler to prepare the sound insulation pad, and because the pig bone charcoal has a large number of micro pores and holes which are communicated with the inside and the outside, when sound waves are incident on the surface of the modified pig bone charcoal, the sound waves can enter the material along the pores to cause the vibration of air molecules in the pores and the fine straw powder adsorbed in the inside, and because the viscous resistance of air and the vibration friction between the air molecules and the pore walls and the fine straw fibers, sound energy is converted into heat energy to be lost, so that the sound energy is reduced, and an excellent sound insulation effect is achieved;
(2) the application firstly takes bamboo fiber as a raw material, organic acid is separated from hemicellulose in the bamboo fiber through the hydrothermal action of high-temperature and high-pressure alkali boiling, the organic acid further promotes the hydrolysis of cellulose, furfural is generated due to the hydrolysis, the generated furfural can be further condensed to form a polymer under the high-pressure condition, the bamboo fiber is resinified, the resinified bamboo fiber is sequentially used as a filler to prepare the sound insulation pad, on one hand, the modified bamboo fiber keeps the original structural characteristics of the modified bamboo fiber, namely, transverse joints are arranged longitudinally, the thickness distribution is not uniform, numerous fine grooves are arranged on the surface of the fiber, the transverse grooves are irregular oval, waist round and the like, a middle cavity is arranged in the sound insulation pad, gaps which are large and small are distributed on the cross section, cracks are arranged at the edge, the fiber structure of the bamboo fiber is firstly modified, the transmission path of sound waves transmitted from the outside is, viscous resistance and vibration friction are generated between the gaps, grooves and cracks of the bamboo fibers and the transmitted sound waves, sound energy is converted into heat energy to be lost, therefore, the sound energy is reduced, the sound insulation effect is achieved, on the other hand, the modified bamboo fiber is in disordered arrangement when being used as the filler to be mixed into the polymer matrix of the sound insulation pad, a layer of stress evacuation path is formed among the modified bamboo fiber, the modified bamboo fiber has viscosity, and can be used for releasing force when being subjected to external impact stress, in addition, the polymer layer on the surface of the modified bamboo fiber has viscosity, after being added into the sound insulation pad matrix, the viscous force of a system can be improved, the damping performance of the material is enhanced, the damping can attenuate the sound wave vibration energy transmitted along the structure, the vibration near the resonance frequency can be weakened, and the impact vibration strength of the sound insulation pad is weakened, so that the sound insulation performance and the impact resistance of the sound insulation pad are enhanced simultaneously.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
(1) Weighing pig bones, cleaning, then putting the pig bones into a grinder, grinding to obtain pig bone crushed materials, mixing the pig bone crushed materials, water and protease according to the mass ratio of 10:100:3, then putting the mixture into an enzymolysis tank, carrying out heat preservation and enzymolysis for 10-12 hours at the temperature of 35-40 ℃, and obtaining enzymolysis crushed materials after the enzymolysis is finished; the protein components in the pig bones are subjected to enzymolysis through enzymolysis, so that the porosity and the surface roughness of the crushed pig bones are improved;
(2) putting the obtained enzymolysis crushed material into a carbonization furnace, heating to 300-400 ℃ under the protection of nitrogen, carrying out heat preservation carbonization for 3-4 h, and obtaining porous pig bone charcoal after carbonization; obtaining pig bone charcoal with high porosity and rough surface through carbonization;
(3) weighing straws, putting the straws into a ball milling crusher, performing ball milling crushing treatment for 1-2 hours, then sieving the straws with a 200-mesh sieve, collecting sieved straw powder, mixing the sieved straw powder and porous pig bone charcoal according to a mass ratio of 1:2, putting the mixture into an ultrasonic oscillator, and performing ultrasonic oscillation treatment for 3-5 hours at a frequency of 25-30 kHz to obtain modified porous pig bone charcoal; the smashed fine straw fibers are adsorbed and fixed in the internal pores of the porous pig bone charcoal through ultrasonic oscillation treatment, and the smashed fine straw fibers are used as a filler to prepare the sound insulation pad;
(4) mixing bamboo fiber with a sodium hydroxide solution with the mass fraction of 5% according to the mass ratio of 1:10, putting the mixture into a high-temperature reaction kettle, heating to 200-250 ℃, pressurizing to 1.2-1.3 Mpa, reacting for 3-5 h at high temperature and high pressure, and after the reaction is finished, filtering and separating to obtain filter residue to obtain modified bamboo fiber; firstly, raw bamboo fiber is taken as a raw material, organic acid is separated from hemicellulose in the raw bamboo fiber through hydrothermal action of high-temperature high-pressure alkali boiling, the organic acid further promotes cellulose hydrolysis, furfural is generated due to hydrolysis, the generated furfural is further condensed to form a polymer under high-pressure conditions, the raw bamboo fiber is resinified, the bamboo fiber resinified in sequence is taken as a filler to prepare the sound insulation pad, on one hand, the modified bamboo fiber keeps the original structural characteristics of the modified bamboo fiber, namely, the modified bamboo fiber has transverse joints in the longitudinal direction and uneven thickness distribution, numerous fine grooves are formed on the surface of the fiber, the fiber is in an oval shape and a round waist shape in the transverse direction, a middle cavity is arranged in the fiber, gaps with large sizes and small sizes are distributed on the cross section, cracks are formed on the edge, the fiber structure of the raw bamboo fiber is firstly modified, so that the transmission path of sound waves transmitted from the outside, The existence of the groove and the crack, viscous resistance and vibration friction are generated between the groove and the introduced sound wave, the sound energy is converted into heat energy to be lost, the sound energy is reduced, and the sound insulation effect is achieved;
(5) weighing 35-40 parts of EVA resin, 15-20 parts of polyethylene glycol terephthalate, 1-3 parts of sodium dodecyl sulfate, 2-4 parts of hydroxyethyl acrylate, 10-15 parts of modified porous pig bone charcoal and 15-20 parts of modified bamboo fiber in parts by weight;
(6) uniformly stirring modified bamboo fibrils and polyethylene glycol terephthalate at normal temperature to obtain a main material, mixing sodium dodecyl sulfate and the main material, melting the mixture into colloid in a glue melting machine at 240 ℃, cooling to 50 ℃ to obtain a secondary main material, adding EVA resin, hydroxyethyl acrylate and modified porous pig bone charcoal into the secondary main material, placing the mixture in an internal mixer for internal mixing for 15-20 min at the temperature of 95 ℃, cooling to normal temperature, injecting the mixture into a steam hot-pressing mold for sealing, introducing high-pressure steam to 0.07MPa, keeping the pressure for 1min, unloading the pressure, cooling and opening the mold to obtain the impact-resistant automobile front wall sound insulation pad. Through mixing, and the micro-pore mechanism is generated inside the sound insulation pad under the action of the surfactant, and the pores are utilized to play the roles of impact resistance buffering and sound insulation, so that the impact resistance and the sound insulation performance of the sound insulation pad are further improved.
Example 1
Weighing pig bones, cleaning, putting into a pulverizer, pulverizing to obtain pig bone pulverized materials, mixing the pig bone pulverized materials, water and protease according to the mass ratio of 10:100:3, putting into an enzymolysis tank, carrying out heat preservation and enzymolysis for 10 hours at the temperature of 35 ℃, and obtaining enzymolysis pulverized materials after the enzymolysis is finished;
putting the obtained enzymolysis crushed material into a carbonization furnace, heating to 300 ℃ under the protection of nitrogen, carrying out heat preservation carbonization treatment for 3h, and obtaining porous pig bone charcoal after carbonization;
weighing straws, putting the straws into a ball milling crusher, performing ball milling crushing treatment for 1h, then sieving the straws with a 200-mesh sieve, collecting sieved straw powder, mixing the sieved straw powder and porous pig bone carbon according to a mass ratio of 1:2, putting the mixture into an ultrasonic oscillator, and performing ultrasonic oscillation treatment at a frequency of 25kHz for 3h to obtain modified porous pig bone carbon;
mixing bamboo fiber with a sodium hydroxide solution with the mass fraction of 5% according to the mass ratio of 1:10, putting the mixture into a high-temperature reaction kettle, heating to 200 ℃, pressurizing to 1.2Mpa, reacting for 3 hours at high temperature and high pressure, and filtering and separating to obtain filter residue after the reaction is finished to obtain modified bamboo fiber;
weighing 35 parts of EVA resin, 15 parts of polyethylene glycol terephthalate, 1 part of sodium dodecyl sulfate, 2 parts of hydroxyethyl acrylate, 10 parts of modified porous pig bone charcoal and 15 parts of modified bamboo fiber in parts by weight;
uniformly stirring modified bamboo fibrils and polyethylene glycol terephthalate at normal temperature to obtain a main material, mixing sodium dodecyl sulfate and the main material, melting the mixture into colloid in a glue melting machine at 240 ℃, cooling to 50 ℃ to obtain a secondary main material, adding EVA resin, hydroxyethyl acrylate and modified porous pig bone charcoal into the secondary main material, placing the mixture in an internal mixer for internal mixing for 15min at the temperature of 95 ℃, cooling to normal temperature, injecting the mixture into a steam hot-pressing mold for sealing, introducing high-pressure steam to 0.07MPa, keeping the pressure for 1min, unloading the pressure, cooling and opening the mold to obtain the impact-resistant automobile front wall sound insulating pad.
Example 2
Weighing pig bones, cleaning, putting into a pulverizer, pulverizing to obtain pig bone pulverized materials, mixing the pig bone pulverized materials, water and protease according to the mass ratio of 10:100:3, putting into an enzymolysis tank, carrying out heat preservation and enzymolysis at the temperature of 38 ℃ for 11 hours, and obtaining enzymolysis pulverized materials after the enzymolysis is finished;
putting the obtained enzymolysis crushed material into a carbonization furnace, heating to 350 ℃ under the protection of nitrogen, carrying out heat preservation carbonization treatment for 3h, and obtaining porous pig bone charcoal after carbonization;
weighing straws, putting the straws into a ball milling crusher, performing ball milling crushing treatment for 2 hours, then sieving the straws with a 200-mesh sieve, collecting sieved straw powder, mixing the sieved straw powder and porous pig bone charcoal according to a mass ratio of 1:2, putting the mixture into an ultrasonic oscillator, and performing ultrasonic oscillation treatment at a frequency of 28kHz for 4 hours to obtain modified porous pig bone charcoal;
mixing bamboo fiber with a sodium hydroxide solution with the mass fraction of 5% according to the mass ratio of 1:10, putting the mixture into a high-temperature reaction kettle, heating to 230 ℃, pressurizing to 1.2Mpa, reacting for 4 hours at high temperature and high pressure, and filtering and separating to obtain filter residue after the reaction is finished to obtain modified bamboo fiber;
weighing 38 parts of EVA resin, 18 parts of polyethylene glycol terephthalate, 2 parts of sodium dodecyl sulfate, 3 parts of hydroxyethyl acrylate, 13 parts of modified porous pig bone charcoal and 18 parts of modified bamboo fiber in parts by weight;
uniformly stirring modified bamboo fibrils and polyethylene glycol terephthalate at normal temperature to obtain a main material, mixing sodium dodecyl sulfate and the main material, melting the mixture into colloid in a glue melting machine at 240 ℃, cooling to 50 ℃ to obtain a secondary main material, adding EVA resin, hydroxyethyl acrylate and modified porous pig bone charcoal into the secondary main material, placing the mixture in an internal mixer for internal mixing at the temperature of 95 ℃ for 18min, cooling to normal temperature, injecting the mixture into a steam hot-pressing mold for sealing, introducing high-pressure steam to 0.07MPa, keeping the pressure for 1min, unloading the pressure, cooling and opening the mold to obtain the impact-resistant automobile front wall sound insulating pad.
Example 3
Weighing pig bones, cleaning, putting into a pulverizer, pulverizing to obtain pig bone pulverized materials, mixing the pig bone pulverized materials, water and protease according to the mass ratio of 10:100:3, putting into an enzymolysis tank, carrying out heat preservation and enzymolysis for 12 hours at the temperature of 40 ℃, and obtaining enzymolysis pulverized materials after the enzymolysis is finished;
putting the obtained enzymolysis crushed material into a carbonization furnace, heating to 400 ℃ under the protection of nitrogen, carrying out heat preservation carbonization for 4 hours, and obtaining porous pig bone charcoal after carbonization;
weighing straws, putting the straws into a ball milling crusher, performing ball milling crushing treatment for 2 hours, then sieving the straws with a 200-mesh sieve, collecting sieved straw powder, mixing the sieved straw powder and porous pig bone charcoal according to a mass ratio of 1:2, putting the mixture into an ultrasonic oscillator, and performing ultrasonic oscillation treatment at a frequency of 30kHz for 5 hours to obtain modified porous pig bone charcoal;
mixing bamboo fiber with a sodium hydroxide solution with the mass fraction of 5% according to the mass ratio of 1:10, putting the mixture into a high-temperature reaction kettle, heating to 250 ℃, pressurizing to 1.3Mpa, reacting for 5 hours at high temperature and high pressure, and filtering and separating to obtain filter residue after the reaction is finished to obtain modified bamboo fiber;
weighing 40 parts of EVA resin, 20 parts of polyethylene glycol terephthalate, 3 parts of sodium dodecyl sulfate, 4 parts of hydroxyethyl acrylate, 15 parts of modified porous pig bone charcoal and 20 parts of modified bamboo fiber in parts by weight;
uniformly stirring modified bamboo fibrils and polyethylene glycol terephthalate at normal temperature to obtain a main material, mixing sodium dodecyl sulfate and the main material, melting the mixture into colloid in a glue melting machine at 240 ℃, cooling to 50 ℃ to obtain a secondary main material, adding EVA resin, hydroxyethyl acrylate and modified porous pig bone charcoal into the secondary main material, placing the mixture in an internal mixer for internal mixing at the temperature of 95 ℃ for 20min, cooling to normal temperature, injecting the mixture into a steam hot-pressing mold for sealing, introducing high-pressure steam to 0.07MPa, keeping the pressure for 1min, unloading the pressure, cooling and opening the mold to obtain the impact-resistant automobile front wall sound insulating pad.
Comparative example 1
In comparative example 1, ordinary biomass charcoal was used instead of the modified porous pig bone charcoal in example 1, and the remaining conditions and component ratios were the same as in example 1.
Comparative example 2
In comparative example 2, the porous porcine bone charcoal of the present application was used in place of the modified porous porcine bone charcoal of example 1, and the remaining conditions and component ratios were the same as in example 1.
Comparative example 3
In comparative example 3, straw fibers were used in place of the modified bamboo fibers in example 1, and the remaining conditions and component ratios were the same as in example 1.
Comparative example 4
In comparative example 4, ordinary bamboo fibers were used instead of the modified bamboo fibers in example 1, and the remaining conditions and component ratios were the same as in example 1.
Performance test
The performance tests were performed on examples 1 to 3 and comparative examples 1 to 4, respectively, and the test results are shown in table 1;
detection method/test method
And (3) testing the impact resistance:
the notched impact strength was determined in accordance with GB/T1043-2008.
And (3) detecting the sound insulation performance:
adopt the decibel appearance as measuring tool, get the sound insulating pad sample that the size is 50cm x 50cm and hang 50cm department in decibel appearance the place ahead, detect the volume that the decibel volume that the sound source that apart from the decibel appearance linear distance is 1m sent is separated by the sound insulating pad, regard it as the data that mark sound insulating pad sound insulation, sound insulating volume is normal measurement volume-the measurement volume after the separation of sound insulating pad, sound insulating volume is higher, sound insulation performance is better.
Specific detection results are shown in table 1:
the performance detection results of examples 1-3 are compared, wherein the performance data of example 3 is the most excellent, because the proportion of the added materials in example 3 is the highest, and the technical scheme of the application is reflected from the side face to be implementable.
Comparing the performance test results of the example 1 with the comparison example 1 and the comparison example 2, because the common biomass carbon is used to replace the modified porous pig bone carbon in the example 1 in the comparison example 1, the porous pig bone carbon of the application is used to replace the modified porous pig bone carbon in the example 1 in the comparison example 2, the rest conditions and the component proportion are the same as those in the example 1, the sound insulation performance of the sound insulation pad is finally reduced, and the reduction degree of the comparison example 1 is higher, therefore, the application leads the protein component in the pig bone to be subjected to enzymolysis through enzymolysis, thereby improving the porosity and the surface roughness of the pig bone fragments, the pig bone carbon with high porosity and rough surface is obtained through carbonization, the crushed fine straw fiber is adsorbed and fixed in the internal pore space of the porous pig bone carbon through ultrasonic oscillation treatment, and is used as a filler, the sound insulation pad is prepared, because the pig bone charcoal has a large number of micro pores and holes which are communicated with each other inside and outside, when sound waves are incident on the surface of the modified pig bone charcoal, the sound waves can enter the interior of the material along the pores to cause the vibration of air molecules in the pores and the fine straw powder adsorbed inside the pores, and due to the viscous resistance of air and the vibration friction between the air molecules and the pore walls and the fine straw fibers, sound energy is converted into heat energy to be lost, so that the sound energy is reduced, and an excellent sound insulation effect is achieved;
comparing the performance test results of example 1 and comparative example 3 and comparative example 4, since the modified bamboo fiber of example 1 was replaced by straw fiber in comparative example 3, the rest conditions and component ratios were the same as those of example 1, and the modified bamboo fiber of example 1 was replaced by ordinary bamboo fiber in comparative example 4, and the rest conditions and component ratios were the same as those of example 1, the sound insulation pad finally obtained had reduced sound insulation and impact resistance, and the reduced range of comparative example 3 was larger, it can be seen that, firstly, the bamboo fiber was used as the raw material, the hemicellulose in the bamboo fiber was separated into organic acid by hydrothermal action of high temperature and high pressure alkali cooking, the organic acid further promoted hydrolysis of cellulose, hydrolysis led to production of furfural, the produced furfural was further condensed to form polymer under high pressure condition, and the bamboo fiber was resinified, the resinified bamboo fiber is used as the filler to prepare the sound insulation pad, on one hand, the modified bamboo fiber keeps the original structural characteristics, namely, the modified bamboo fiber has transverse joints in the longitudinal direction, the thickness distribution is uneven, the fiber surface has countless fine grooves which are irregular ellipse, waist circle and the like in the transverse direction, a middle cavity is arranged in the fiber, gaps with large sizes and small sizes are distributed on the cross section, cracks are arranged on the edge, the fiber structure of the bamboo fiber is firstly modified, so that the transmission path of sound waves transmitted from the outside is blocked, the primary sound insulation effect is achieved, the gaps, the grooves and the cracks of the bamboo fiber and the transmitted sound waves generate viscous resistance and vibration friction, sound energy is converted into heat energy to be lost, therefore, the sound energy is reduced, the sound insulation effect is achieved, on the other hand, the modified bamboo fiber is disorderly arranged when being used as the filler to be mixed into the polymer matrix of the sound, the modified bamboo fiber surface polymer layer has viscosity, and after the modified bamboo fiber surface polymer layer is added into a sound insulation pad matrix, the viscosity of a system can be improved, the damping performance of the material is enhanced, the damping can attenuate sound wave vibration energy transmitted along the structure, the vibration near the resonance frequency can be weakened, the impact vibration strength of the sound insulation pad is weakened, and the sound insulation performance and the impact resistance of the sound insulation pad are enhanced simultaneously.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The utility model provides a enclose before car and give sound insulation and fill up shocks resistance which characterized in that by weight portion, includes following raw materials:
35-40 parts of EVA resin;
15-20 parts of polyethylene terephthalate;
1-3 parts of sodium dodecyl sulfate;
2-4 parts of hydroxyethyl acrylate;
10-15 parts of porous pig bone charcoal;
15-20 parts of bamboo fiber;
the porous pig bone charcoal is prepared by carrying out enzymolysis on pig bones, water and protease and then carbonizing.
2. An impact-resistant automotive front wall sound insulation pad as claimed in claim 1, wherein: the porous pig bone carbon can also be modified porous pig bone carbon;
the modified porous pig bone charcoal is prepared by reacting straw and porous pig bone charcoal.
3. An impact-resistant automotive front wall sound insulation pad as claimed in claim 1, wherein: the bamboo fiber can also be modified bamboo fiber;
the modified bamboo fiber is prepared by reacting bamboo fiber and sodium hydroxide solution at high temperature and high pressure.
4. The impact-resistant automobile front wall sound insulation pad as claimed in claim 1, wherein the porous pig bone charcoal is prepared by the following steps:
(1) weighing pig bones, cleaning, then putting the pig bones into a grinder, grinding to obtain pig bone crushed materials, mixing the pig bone crushed materials, water and protease according to the mass ratio of 10:100:3, then putting the mixture into an enzymolysis tank, carrying out heat preservation and enzymolysis for 10-12 hours at the temperature of 35-40 ℃, and obtaining enzymolysis crushed materials after the enzymolysis is finished;
(2) and (3) putting the obtained enzymolysis crushed material into a carbonization furnace, heating to 300-400 ℃ under the protection of nitrogen, carrying out heat preservation carbonization for 3-4 h, and obtaining the porous pig bone charcoal after carbonization.
5. The impact-resistant automobile front wall sound insulation pad as claimed in claim 2, wherein the modified porous pig bone charcoal is prepared by the following steps:
weighing straws, putting the straws into a ball milling crusher, performing ball milling crushing treatment for 1-2 hours, then sieving the straws with a 200-mesh sieve, collecting sieved straw powder, mixing the sieved straw powder and porous pig bone charcoal according to a mass ratio of 1:2, putting the mixture into an ultrasonic oscillator, and performing ultrasonic oscillation treatment for 3-5 hours at a frequency of 25-30 kHz to obtain the modified porous pig bone charcoal.
6. The impact-resistant automobile front wall sound insulation pad as claimed in claim 2, wherein the modified bamboo fiber is prepared by the following steps:
mixing bamboo fiber with a sodium hydroxide solution with the mass fraction of 5% according to the mass ratio of 1:10, putting the mixture into a high-temperature reaction kettle, heating to 200-250 ℃, pressurizing to 1.2-1.3 Mpa, reacting for 3-5 h at high temperature and high pressure, and after the reaction is finished, filtering and separating to obtain filter residue to obtain the modified bamboo fiber.
7. The preparation steps of the impact-resistant automobile front wall sound insulation pad are characterized by comprising the following steps:
(1) weighing 35-40 parts of EVA resin, 15-20 parts of polyethylene glycol terephthalate, 1-3 parts of sodium dodecyl sulfate, 2-4 parts of hydroxyethyl acrylate, 10-15 parts of modified porous pig bone charcoal and 15-20 parts of modified bamboo fiber in parts by weight;
(2) uniformly stirring modified bamboo fibrils and polyethylene glycol terephthalate at normal temperature to obtain a main material, mixing sodium dodecyl sulfate and the main material, melting the mixture into colloid in a glue melting machine at 240 ℃, cooling to 50 ℃ to obtain a secondary main material, adding EVA resin, hydroxyethyl acrylate and modified porous pig bone charcoal into the secondary main material, placing the mixture in an internal mixer for internal mixing for 15-20 min at the temperature of 95 ℃, cooling to normal temperature, injecting the mixture into a steam hot-pressing mold for sealing, introducing high-pressure steam to 0.07MPa, keeping the pressure for 1min, unloading the pressure, cooling and opening the mold to obtain the impact-resistant automobile front wall sound insulation pad.
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