CN116001412A - Method for preparing heat insulation pad of automobile engine based on polymer material - Google Patents
Method for preparing heat insulation pad of automobile engine based on polymer material Download PDFInfo
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- CN116001412A CN116001412A CN202211471967.9A CN202211471967A CN116001412A CN 116001412 A CN116001412 A CN 116001412A CN 202211471967 A CN202211471967 A CN 202211471967A CN 116001412 A CN116001412 A CN 116001412A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
Abstract
The invention relates to the technical field of automobile part processing, in particular to a method for preparing an automobile engine heat insulation pad based on a polymer material, which comprises the steps of respectively arranging hemispherical grooves on two foaming plates prepared by foaming the polymer material, filling with a filler, and relatively covering and laminating the hemispherical grooves to form a foaming plate structure layer, so that the sound insulation and heat insulation effects are improved; and the foaming foam of the polymer material is sprayed on the surface of the foaming plate structure layer, a non-woven fabric layer is paved to form the non-woven fabric layer, then the semi-finished heat insulation pad is manufactured by utilizing the synthetic die pressing, the bonding compactness of an interlayer structure is improved, and then the aluminum foil layer is plated by the pressing process to obtain the finished heat insulation pad for the automobile engine.
Description
Technical Field
The invention relates to the technical field of automobile part processing, in particular to a method for preparing an automobile engine heat insulation pad based on a polymer material.
Background
The heat insulation pad of the automobile engine is arranged at the position of an engine cabin of the automobile and is used for heat insulation and noise reduction. Along with the rapid development of automobile technology, consumers have higher and higher requirements on the whole driving environment, so that various automobile manufacturers are striving to improve the comfort level of the whole automobile, and a great deal of researches on heat insulation pads of automobile engines are carried out.
For example: patent No. 201010610013.2 discloses a sound and heat insulation pad for an automobile engine compartment with a multilayer structure and a preparation method thereof, wherein the density of the upper surface layer and the lower surface layer is 100g/cm 2 The middle layer is non-woven fabric with density of 13-18kg/m 3 The flame-retardant polyurethane layer is prepared by mixing graphite powder, polyether and isocyanate, slicing to obtain a flame-retardant polyurethane foaming layer, placing the polyurethane foaming layer and non-woven fabric into a forming die, and performing compression treatment to obtain the sound-proof and heat-proof pad for the automobile engine compartment with the multilayer structure, wherein compared with the existing heat-proof pad, the weight of the heat-proof and heat-proof pad is reduced by 70%.
For another example: the patent number 201210301722.1 discloses a production method of an automobile engine compartment heat insulation pad, wherein a PE foaming plate and an aluminum foil are respectively placed on a conveying table, the aluminum foil and the PE foaming plate are conveyed into a flame compounding machine, when the PE foaming plate passes through flame, the surface layer of the PE foaming plate is quickly melted to generate a sticky film, after the PE foaming plate passes through flame, the aluminum foil is covered on the PE foaming plate with the melted surface layer and passes between an upper compression roller press and a lower compression roller press of the flame compounding machine together with the PE foaming plate, and the distance between the upper compression roller press and the lower compression roller press of the flame compounding machine is 0.5-1 mm smaller than the thickness of the PE foaming plate, so that an automobile engine compartment heat insulation pad semi-finished product is obtained; cutting the semi-finished product of the heat insulation pad of the automobile engine compartment by using a water knife cutting device to obtain a finished product of the heat insulation pad of the automobile engine compartment; the heat conductivity coefficient is 0.026-0.032W/mK, the noise loss is 7.14-7.84 under 200Hz, and the noise loss is 42.1-45.35 under 2000 Hz.
For another example: the patent number 201310736244.1 discloses an automobile engine compartment heat insulation pad and preparation, adopts four structural layers to set up, is aluminium foil layer, PU foaming layer, EVA layer and XPE layer respectively, utilizes the aluminium injection molding mould pressing processing aluminium foil layer, PU foaming layer spraying, mould pressing EVA layer and bonding XPE layer scheduling step preparation to solve closely with the automobile body laminating, prevent to lead to the problem that the top layer aluminium foil is pulled apart in the mould pressing shaping process, reduced the material waste.
However, the heat insulation effect of the heat insulation pad of the automobile engine obtained in the prior art is still not ideal, especially the noise reduction effect is still not good, and the driving comfort of the whole automobile is still poor. Based on the above, the researcher stands on the long-term exploration and research on the heat insulation and noise reduction treatment of the automobile engine, and provides a new thought for the technical field of preparation of the heat insulation pad of the automobile engine.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a method for preparing an automobile engine heat insulation pad based on a polymer material.
The method is realized by the following technical scheme:
the method for preparing the heat insulation pad of the automobile engine based on the polymer material comprises a foaming plate structure layer prepared by the polymer material, non-woven fabric layers arranged on the upper surface and the lower surface of the foaming plate structure layer, an aluminum foil layer plated on the non-woven fabric layer arranged on the upper surface of the foaming plate structure layer, a plurality of hollow sound absorption balls arranged in the foaming plate structure layer, and filling agents filled in the sound absorption balls; the preparation method of the heat insulation pad of the automobile engine comprises the following steps:
s1: preparing a polymer material into a foaming plate, arranging a hemispherical groove on the foaming plate, and filling a filler in the hemispherical groove; two foaming plates are oppositely covered on one side provided with the hemispherical grooves to form spherical sound absorbing balls, and then the spherical sound absorbing balls are extruded to form a foaming plate structure layer;
s2: spraying polymer material foaming foam on the surface of the foaming plate structure layer, respectively paving a layer of non-woven fabrics on the upper surface and the lower surface of the foaming plate structure layer, sending into a forming die, and carrying out die closing and pressing for 120-180s at the pressure of 180-200bar to obtain a semi-finished product;
s3: and (3) pre-forming the aluminum foil by using an aluminum injection forming process, attaching the aluminum foil on the surface of the semi-finished product, and carrying out die closing and pressing for 10-20s at the pressure of 180-200bar, and opening and taking out the die to obtain the aluminum foil.
Two foaming plates which are prepared by introducing polymer materials for foaming are respectively provided with hemispherical grooves, and then are relatively covered and attached to form a foaming plate structure layer after being filled with filler, so that the sound insulation and heat insulation effects are improved; and the foaming foam of the polymer material is sprayed on the surface of the foaming plate structure layer, a non-woven fabric layer is paved to form the non-woven fabric layer, then the semi-finished heat insulation pad is manufactured by utilizing the synthetic die pressing, the bonding compactness of an interlayer structure is improved, and then the aluminum foil layer is plated by the pressing process to obtain the finished heat insulation pad for the automobile engine.
In order to ensure that the thickness of the heat insulation pad is proper and the heat insulation and sound insulation effects are excellent, the diameter of the sound absorption ball is preferably 0.6-1mm.
In order to ensure the stability of the whole structure of the foaming plate and improve the heat insulation and noise reduction effects, preferably, the distance between two adjacent sound absorbing balls is 1-3cm.
In order to reduce the cost of raw materials and enhance the heat insulation and noise reduction effects, preferably, the filler is prepared by calcining phosphogypsum at 800-1200 ℃ and ball milling, sieving with a 1000-mesh sieve to form powder, adding polymer material foaming foam accounting for 1-3% of the mass of the phosphogypsum, and uniformly stirring.
In order to ensure the heat insulation and noise reduction performance and lighter weight after filling with the filling agent, preferably, the phosphogypsum is added with antimony tail slag powder accounting for 10-20% of the mass of the phosphogypsum. More preferably, the antimony tailings powder is formed by drying antimony tailings to constant weight by a dryer.
The polymer material provided by the invention comprises, but is not limited to, polyurethane and polyethylene, and preferably, the polymer material is formed by mixing polyurethane and polyethylene according to the mass ratio of 1:0.5-2. More preferably, the polymer material is formed by mixing polyurethane and polyethylene according to a mass ratio of 1:1.
The nonwoven fabric used in the embodiments of the present invention has a density selected from, but not limited to, 80-90g/cm 2 。
The thickness of the aluminum foil layer is 0.1-0.2mm. More preferably 0.1mm, which contributes to weight saving and cost reduction.
Compared with the prior art, the invention has the technical effects that:
the invention has simple integral process, easily obtained manufacturing raw materials and low manufacturing cost, and introduces the hemispherical groove structure on the foaming plate, so that the filler can be better compounded in the foaming plate, the integral heat insulation and noise reduction performance of the foaming plate is enhanced, the integral structure of the heat insulation pad of the traditional automobile engine is improved, and the noise reduction effect of the heat insulation pad is improved.
The invention adds the sound insulation ball structure in the foaming board with the heat insulation and noise reduction functions, the sound insulation ball structure is formed by ironing and filling the foaming board, and the ball is formed by bonding two foaming boards, so that the difficulty of ball forming is reduced, the preparation process is simplified, and the preparation cost is reduced; meanwhile, the sound insulation balls are distributed in a powdery mode, so that noise is blocked, refracted and reflected by a plurality of powdery particles after being transmitted to the sound insulation balls, and the loss rate of sound transmission is improved; and the powdered particles will result in a reduced heat transfer effect, which in turn enhances the thermal insulation effect.
Drawings
FIG. 1 is a schematic diagram of the process flow of the invention.
FIG. 2 is a schematic diagram of a heat insulation pad for an automobile engine according to the present invention.
Fig. 3 is a schematic view of the structure of the sound absorbing balls arranged on the foaming plate.
1-a foaming plate structure layer 2-sound absorption balls 3-a filling agent 4-a non-woven fabric layer 5-an aluminum foil layer.
Detailed Description
The technical solution of the present invention is further defined below with reference to the accompanying drawings and specific embodiments, but the scope of the claims is not limited to the description.
As shown in fig. 1, 2 and 3, in some embodiments, a method for preparing an automobile engine heat insulation pad based on a polymer material includes a foam board structure layer 1 prepared from the polymer material, a non-woven fabric layer 4 arranged on the upper surface and the lower surface of the foam board structure layer 1, an aluminum foil layer 5 plated on the non-woven fabric layer 4 arranged on the upper surface of the foam board structure layer 1, and a plurality of hollow sound-absorbing balls 2 arranged in the foam board structure layer 1, wherein the sound-absorbing balls 2 are filled with a filler 3; the preparation method of the heat insulation pad of the automobile engine comprises the following steps:
s1: preparing a polymer material into a foaming plate, arranging a hemispherical groove on the foaming plate, and filling a filler 3 in the hemispherical groove; two foaming plates are oppositely covered on one side provided with the hemispherical grooves to form spherical sound-absorbing balls 2, and then the spherical sound-absorbing balls are extruded to form a foaming plate structure layer 1;
s2: spraying polymer material foaming foam on the surface of the foaming plate structure layer 1, respectively paving a layer of non-woven fabrics on the upper surface and the lower surface of the foaming plate structure layer 1, sending into a forming die, and carrying out die assembly pressing for 120-180s at the pressure of 180-200bar, for example: performing mold closing and pressing at 180bar for 180s, mold closing and pressing at 180bar for 120s, mold closing and pressing at 190bar for 150s, mold closing and pressing at 200bar for 180s, mold closing and pressing at 200bar for 170s and the like to obtain a semi-finished product;
s3: the aluminum foil is preformed by an aluminum injection molding process and then attached to the surface of the semi-finished product, and the aluminum foil is subjected to die assembly pressing for 10-20s at a pressure of 180-200bar, for example: and (3) after the treatments of pressing for 10s under 180bar, 20s under 190bar, 15s under 200bar and the like, opening the die and taking out the die to obtain the finished product.
And the structure of the sound insulation ball 2 is fully introduced, the structure of the sound insulation ball 2 is formed by covering two foaming plates with filling agent 3 to form a foaming plate structure layer 1, and then the foaming plates are clamped and pressed to form the sound insulation ball 2, so that the heat insulation and noise reduction effects of the heat insulation pad of the automobile engine are enhanced. In particular, in certain embodiments, the filler is prepared in a powder form from mineral waste residues by calcination, ball milling, and sieving. For example: the mineral waste residue is selected from, but not limited to, phosphogypsum, fluorite tailing slag, manganese slag, antimony tailing slag and other waste components, and is prepared into powder for activation through calcination, ball milling and sieving, so that collision can occur between the powder, gaps are formed between the powder and the powder, the heat transfer effect is reduced, the heat insulation effect is enhanced, meanwhile, the sound wave can be blocked, and the transfer process is reduced, so that the noise reduction effect is achieved.
In certain embodiments, the sound absorbing ball 2 has a diameter of 0.6-1mm, for example: 0.6mm,0.7mm,0.8mm,0.9mm,1mm and the like, can form a sufficient micro space, and can enhance the heat insulation and noise reduction effects.
In some embodiments, the sound-absorbing balls 2 have a spacing between two adjacent balls of 1-3cm, for example: 1cm,2cm,3cm, etc., can effectively ensure to inhale and have sufficient foaming sheet material to connect between the sound ball 2, ensure heat insulating mattress bulk strength, strengthen the sound wave and prevent the stroke in heat insulating mattress inside, improve the noise reduction effect.
In certain embodiments, the filler 3 is a phosphogypsum at 800-1200 ℃, for example: isothermal calcination ball milling at 800 ℃,900 ℃,1000 ℃,1100 ℃ and 1200 ℃ is carried out, powder is formed after sieving by a 1000-mesh sieve, and phosphogypsum accounting for 1-3% of the mass is added, for example: 1%,2%,3% and the like of polymer materials, and uniformly stirring to achieve the effect of enhancing the fit between the inner walls of the hemispherical grooves.
In some embodiments, the phosphogypsum is added with 10-20% of phosphogypsum by mass, for example: 10%,11%,12%,13%,14%,15%,16%,17%,18%,19%,20% and the like. The antimony tailings powder is formed by drying antimony tailings to constant weight through a dryer. The weight of the whole filler is changed, and the interaction between microparticles is improved by utilizing the different density relations between phosphogypsum powder and antimony tailing powder, so that the effects of heat insulation and noise reduction are enhanced.
In certain embodiments, the polymeric material is polyurethane and polyethylene in a mass ratio of 1:0.5-2, for example: 1:0.5,1:0.8,1:1,1:1.2,1:1.5,1:1.8,1:2, etc. In certain embodiments, the nonwoven fabric has a density of 80-90g/cm 2 For example: 80g/cm 2 ，85g/cm 2 ，90g/cm 2 Etc. In certain embodiments, the aluminum foil layer 5 has a thickness of 0.1-0.2mm, such as 0.1mm,0.2mm, etc.
In order to verify the technical effects that the present invention creates, the present invention creates the following description of specific operation schemes developed in the research process of researchers, so that those skilled in the art can accurately and properly understand the whole technical scheme of the present invention.
Test 1: study on influence of sound insulation ball on heat insulation and noise reduction effects
Example 1
Preparing polyethylene into a foaming plate to obtain a PE foaming plate; a PE foaming plate is taken to manufacture a hemispherical groove with the diameter of 1mm on one side surface, and filler 3 is filled in the hemispherical groove; then two PE foaming plates are oppositely covered on one side of the hemispherical groove, so that the hemispherical grooves are oppositely attached to form sound absorbing balls 2, and the sound absorbing balls are extruded for 20s by 180bar to form a foaming plate structure layer 1; spraying PE foam on the surface of the foam board structure layer 1, and taking the foam with the density of 80g/cm 2 Covering the upper surface and the lower surface of the foaming plate structure layer 1 with non-woven fabrics, then feeding the non-woven fabrics into a die, and closing the die and pressing for 120s with the pressure of 180bar to obtain a semi-finished product; injecting aluminum liquid with the temperature of 800 ℃ into a die, pressing and forming at the pressure of 100bar, maintaining the pressure at the pressure of 80bar for 200s, and processing aluminum foil according to other aluminum injection forming processes in the prior art; then sticking the formed aluminum foil to the surface of the semi-finished product, and pressing the aluminum foil with the pressure of 180bar in a die closing mode for 20 seconds to prepare an aluminum foil layer with the thickness of 0.2mm, and opening the die and taking out the aluminum foil layer to obtain the finished product of the heat insulation pad for the automobile engine; in this example, the distance between two adjacent sound-absorbing balls 2 is 1mm, and the filler is powder formed by calcining phosphogypsum at 800 ℃ and ball milling and sieving with a 1000-mesh sieve, and PE foaming foam accounting for 1% of the mass of the phosphogypsum is mixed.The PE foaming foam is prepared by mixing PE and a foaming agent according to a ratio of 100:1, and the foaming agent is prepared by mixing 1% zinc oxide into azodicarbonamide.
Comparative example 1
Unlike example 1, the following is: no hemispherical recess was provided and no filler filling treatment was applied, otherwise the same as in example 1.
Example 2
Preparing polyurethane into a foaming plate to obtain a polyurethane foaming plate; a semi-spherical groove with the diameter of 0.8mm is manufactured on one side surface of the polyurethane foaming plate, and the semi-spherical groove is filled with a filling agent 3; then two polyurethane foaming plates are oppositely covered on one side provided with the hemispherical grooves, so that the hemispherical grooves are oppositely attached to form sound absorbing balls 2, and the sound absorbing balls are extruded for 15s by 200bar to form a foaming plate structure layer 1; spraying polyurethane foam on the surface of the foam board structure layer 1, and taking the foam board with the density of 90g/cm 2 Covering the upper surface and the lower surface of the foaming plate structure layer 1 with non-woven fabrics, then feeding the non-woven fabrics into a die, and closing the die and pressing the die for 120s under the pressure of 200bar to obtain a semi-finished product; injecting aluminum liquid with the temperature of 700 ℃ into a die, pressing and forming at 80bar pressure, maintaining the pressure at 80bar pressure for 220s, and processing aluminum foil according to other aluminum injection forming processes in the prior art; then sticking the formed aluminum foil to the surface of the semi-finished product, and pressing the aluminum foil with the pressure of 200bar in a die closing mode for 20 seconds to prepare an aluminum foil layer with the thickness of 0.2mm, and opening the die and taking out the aluminum foil layer to obtain the finished product of the heat insulation pad for the automobile engine; in this example, the distance between two adjacent sound-absorbing balls 2 is 10mm, and the filler is powder formed by calcining phosphogypsum at 1200 ℃ and ball milling and sieving with a 1000-mesh sieve, and polyurethane foam accounting for 3% of the mass of phosphogypsum is mixed. The polyurethane foaming foam is prepared by mixing polyurethane and a foaming agent according to a ratio of 100:1, and the foaming agent is prepared by mixing 3% zinc oxide into azodicarbonamide.
Comparative example 2
Unlike example 2, the following is: no hemispherical recess was provided and no filler filling treatment was applied, otherwise the same as in example 2.
Example 3
Mixing polyurethane and polyethylene according to a mass ratio of 1:1 to prepare a foaming plate, and obtaining a polymer foaming plate; a polymer foaming plate is taken to be manufactured into a hemispherical groove with the diameter of 0.6mm on one side surface, and the hemispherical groove is filled with a filling agent 3; then, two polymer foaming plates are oppositely covered on one side provided with the hemispherical grooves, so that the hemispherical grooves are oppositely attached to form sound absorbing balls 2, and the sound absorbing balls are extruded for 20s by 190bar to form a foaming plate structure layer 1; spraying polyurethane foam on the surface of the foam board structure layer 1, and taking the foam board with the density of 80g/cm 2 Covering the upper surface and the lower surface of the foaming plate structure layer 1 with non-woven fabrics, then feeding the non-woven fabrics into a die, and closing the die and pressing for 200s with the pressure of 190bar to obtain a semi-finished product; pouring the aluminum liquid with the temperature of 740 ℃ into a die, pressing and forming at the pressure of 90bar, maintaining the pressure at the pressure of 80bar for 270s, and processing aluminum foil according to the aluminum pouring and forming process in the prior art; then sticking the formed aluminum foil to the surface of the semi-finished product, and pressing the aluminum foil with the pressure of 190bar in a die closing mode for 10 seconds to prepare an aluminum foil layer with the thickness of 0.2mm, and opening the die and taking out the aluminum foil layer to obtain the finished product of the heat insulation pad for the automobile engine; in this example, the distance between two adjacent sound-absorbing balls 2 is 30mm, and the filler is powder formed by calcining phosphogypsum at 1200 ℃ and ball milling and sieving with a 1000-mesh sieve, and polyurethane foam accounting for 2% of the mass of phosphogypsum is mixed. The polyurethane foaming foam is prepared by mixing polyurethane and a foaming agent according to a ratio of 100:1, and the foaming agent is prepared by mixing 1% zinc oxide into azodicarbonamide.
Comparative example 3
Unlike example 3, the following are: no hemispherical recess was provided and no filler filling treatment was applied, otherwise the same as in example 3.
The heat insulation mats for automobile engines prepared in examples 1 to 3 and comparative examples 1 to 3 were used to examine the sound insulation effect and the heat conductivity coefficient thereof, the noise generated at the time of examination was 200Hz, 400Hz, 2000Hz, 5000Hz, and the sound transmission loss resulting from noise reduction of the prepared heat insulation mats for automobile engines under the corresponding noise generating environments was tested. Specifically, the obtained heat insulation pad for an automobile engine was prepared into a square structure with a side length of 30cm, and a sound generating speaker was placed in the square to be sealed, and the size of the sound transmitted was measured at the outside, and then the Sound Transmission Loss (STL) was calculated, and the test results thereof are shown in table 1 below.
TABLE 1 influence of soundproof balls on heat insulation and noise reduction effects
Remarks: each example group was tested three times for averaging.
As can be seen from table 1, the heat insulation pad for the automobile engine has low heat conduction coefficient, excellent heat insulation effect, improved noise reduction effect, improved loss in the sound transmission process and improved sound insulation effect.
Test 2: study of influence of polymer component composition on heat insulation and noise reduction
Example 4
On the basis of the embodiment 3, the polymer foam board is prepared by mixing polyurethane and polyethylene according to the mass ratio of 1:0.1, and the other components are the same as the embodiment 3.
Example 5
On the basis of the embodiment 3, the polymer foam board is prepared by mixing polyurethane and polyethylene according to the mass ratio of 1:0.5, and the other components are the same as the embodiment 3.
Example 6
On the basis of the embodiment 3, the polymer foam board is prepared by mixing polyurethane and polyethylene according to the mass ratio of 1:0.8, and the other components are the same as the embodiment 3.
Example 7
On the basis of the embodiment 3, the polymer foam board is prepared by mixing polyurethane and polyethylene according to the mass ratio of 1:1.2, and the other components are the same as the embodiment 3.
Example 8
On the basis of the embodiment 3, the polymer foam board is prepared by mixing polyurethane and polyethylene according to the mass ratio of 1:1.5, and the other components are the same as the embodiment 3.
Example 9
On the basis of the embodiment 3, the polymer foam board is prepared by mixing polyurethane and polyethylene according to the mass ratio of 1:1.8, and the other components are the same as the embodiment 3.
Example 10
On the basis of the embodiment 3, the polymer foam board is prepared by mixing polyurethane and polyethylene according to the mass ratio of 1:2, and the other components are the same as the embodiment 3.
Example 11
On the basis of the embodiment 3, the polymer foam board is prepared by mixing polyurethane and polyethylene according to the mass ratio of 1:2.2, and the other components are the same as the embodiment 3.
Example 12
On the basis of the embodiment 3, the polymer foam board is prepared by mixing polyurethane and polyethylene according to the mass ratio of 1:2.5, and the other components are the same as the embodiment 3.
The heat insulating mats for automobile engines obtained in examples 4 to 12 were subjected to the measurement of acoustic transmission loss and thermal conductivity according to the method of test 1, and the results are shown in table 2 below.
TABLE 2 influence of Polymer composition on thermal insulation and noise reduction effects
Remarks: the average was taken three times per test group.
From tables 1 and 2, the invention adopts proper polymer components for mixing and mixing according to a specific mass ratio, which is helpful for improving the heat insulation and noise reduction effects, increasing the sound transmission loss and enhancing the sound insulation effect of the heat insulation pad of the automobile engine.
Test 3: study on influence of filler component composition on heat insulation and noise reduction effects
Example 13
On the basis of the embodiment 3, before the phosphogypsum is calcined, adding antimony tail slag powder accounting for 1% of the mass of the phosphogypsum, wherein the antimony tail slag powder is obtained by drying at 80 ℃ to constant weight, and the other steps are the same as the embodiment 3.
Example 14
On the basis of example 3, before phosphogypsum calcination treatment, antimony tailing powder accounting for 5% of the mass of phosphogypsum is added, and the antimony tailing powder is obtained by drying at 90 ℃ to constant weight, and the other steps are the same as example 3.
Example 15
On the basis of example 3, before phosphogypsum calcination treatment, adding antimony tail slag powder accounting for 10% of the mass of phosphogypsum, wherein the antimony tail slag powder is obtained by drying at 80 ℃ to constant weight, and the other steps are the same as in example 3.
Example 16
On the basis of the embodiment 3, before the phosphogypsum is calcined, adding antimony tail slag powder accounting for 12% of the mass of the phosphogypsum, wherein the antimony tail slag powder is obtained by drying at 90 ℃ to constant weight, and the other steps are the same as the embodiment 3.
Example 17
On the basis of the embodiment 3, before the phosphogypsum is calcined, adding antimony tail slag powder accounting for 15% of the mass of the phosphogypsum, wherein the antimony tail slag powder is obtained by drying at 85 ℃ to constant weight, and the other steps are the same as the embodiment 3.
Example 18
On the basis of the embodiment 3, before the phosphogypsum is calcined, adding antimony tailings powder accounting for 17% of the mass of the phosphogypsum, wherein the antimony tailings powder is obtained by drying at 80 ℃ to constant weight, and the other steps are the same as the embodiment 3.
Example 19
On the basis of the embodiment 3, before the phosphogypsum is calcined, the antimony tail slag powder accounting for 19 percent of the mass of the phosphogypsum is added, and the antimony tail slag powder is obtained by drying at 90 ℃ to constant weight, and the other steps are the same as the embodiment 3.
Example 20
On the basis of example 3, before phosphogypsum calcination treatment, antimony tailing powder accounting for 20% of the mass of phosphogypsum is added, and the antimony tailing powder is obtained by drying at 83 ℃ to constant weight, and the other steps are the same as example 3.
Example 21
On the basis of the embodiment 3, before the phosphogypsum is calcined, adding antimony tail slag powder accounting for 21% of the mass of the phosphogypsum, wherein the antimony tail slag powder is obtained by drying at 92 ℃ to constant weight, and the other steps are the same as the embodiment 3.
Example 22
On the basis of the embodiment 3, before the phosphogypsum is calcined, adding antimony tail slag powder accounting for 25% of the mass of the phosphogypsum, wherein the antimony tail slag powder is obtained by drying at 80 ℃ to constant weight, and the other steps are the same as the embodiment 3.
Example 23
On the basis of example 7, before phosphogypsum calcination treatment, adding antimony tail slag powder accounting for 14% of the mass of phosphogypsum, wherein the antimony tail slag powder is obtained by drying at 80 ℃ to constant weight, and the other steps are the same as in example 7.
Example 24
On the basis of the embodiment 8, before the phosphogypsum is calcined, the antimony tail slag powder accounting for 18 percent of the mass of the phosphogypsum is added, and the antimony tail slag powder is obtained by drying at 80 ℃ to constant weight, and the other steps are the same as the embodiment 8.
The heat insulating mats for automobile engines obtained in examples 13 to 24 were subjected to the measurement of acoustic transmission loss and thermal conductivity according to the method of test 1, and the results are shown in table 3 below.
TABLE 3 influence of filler component groups on thermal insulation and noise reduction effects
Remarks: the average was taken three times per example group.
As is clear from tables 1, 2 and 3, the change of the components of the filler in the invention will affect the sound insulation, noise reduction and heat insulation to a certain extent, the cost of the raw materials is low for preparing the filler by taking phosphogypsum as the raw material, and the density is different due to the fact that the components of the antimony tailings powder and phosphogypsum are different after adding a proper amount of antimony tailings powder for compounding, so that the noise reduction and heat insulation effect can be improved to a certain extent after the filler formed by mixing is used for preparing the heat insulation pad.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (10)
1. The method for preparing the heat insulation pad of the automobile engine based on the polymer material is characterized in that the heat insulation pad of the automobile engine comprises a foaming plate structure layer (1) prepared by the polymer material, non-woven fabric layers (4) arranged on the upper surface and the lower surface of the foaming plate structure layer (1), an aluminum foil layer (5) plated on the non-woven fabric layers (4) arranged on the upper surface of the foaming plate structure layer (1), a plurality of hollow sound absorption balls (2) are arranged in the foaming plate structure layer (1), and filler (3) is filled in the sound absorption balls (2); the preparation method of the heat insulation pad of the automobile engine comprises the following steps:
s1: preparing a polymer material into a foaming plate, arranging a hemispherical groove on the foaming plate, and filling a filler (3) in the hemispherical groove; two foaming plates are oppositely covered on one side provided with the hemispherical grooves to form spherical sound absorbing balls (2), and then the spherical sound absorbing balls are extruded to form a foaming plate structure layer (1);
s2: spraying polymer material foaming foam on the surface of the foaming plate structure layer (1), respectively paving a layer of non-woven fabrics on the upper surface and the lower surface of the foaming plate structure layer (1), feeding into a forming die, and carrying out die closing and pressing for 120-180s at the pressure of 180-200bar to obtain a semi-finished product;
s3: and (3) pre-forming the aluminum foil by using an aluminum injection forming process, attaching the aluminum foil on the surface of the semi-finished product, and carrying out die closing and pressing for 10-20s at the pressure of 180-200bar, and opening and taking out the die to obtain the aluminum foil.
2. A method for the preparation of an automotive engine insulation mat based on a polymeric material according to claim 1, characterized in that the sound absorbing balls (2) have a diameter of 0.6-1mm.
3. Method for the preparation of an automotive engine insulation mat based on a polymeric material according to claim 1 or 2, characterized in that the sound-absorbing balls (2) are spaced apart by a distance of 1-3cm between adjacent ones.
4. The method for preparing the heat insulation pad of the automobile engine based on the polymer material according to claim 1, wherein the filler (3) is prepared by calcining phosphogypsum at 800-1200 ℃ and ball milling, sieving with a 1000-mesh sieve to form powder, adding polymer material foaming foam accounting for 1-3% of the mass of the phosphogypsum, and uniformly stirring.
5. The method for preparing an automobile engine heat insulation mat based on a polymer material according to claim 4, wherein the phosphogypsum is added with antimony tail slag powder accounting for 10-20% of the mass of the phosphogypsum.
6. The method for preparing an automotive engine insulation mat based on a polymeric material according to claim 5, wherein the antimony tailings powder is formed by drying antimony tailings to a constant weight by a dryer.
7. The method for preparing an automotive engine insulation mat based on a polymer material according to claim 1, wherein the polymer material is formed by mixing polyurethane and polyethylene according to a mass ratio of 1:0.5-2.
8. The method for preparing an automotive engine insulation mat based on a polymer material according to claim 1 or 7, wherein the polymer material is formed by mixing polyurethane and polyethylene according to a mass ratio of 1:1.
9. The method for preparing an automotive engine insulation mat based on a polymeric material according to claim 1, wherein the nonwoven fabric has a density of 80-90g/cm 2 。
10. A method for manufacturing an automotive engine insulation mat based on a polymeric material according to claim 1, characterized in that the aluminium foil layer (5) has a thickness of 0.1-0.2mm.
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| KR200293446Y1 (en) * | 2002-07-26 | 2002-10-31 | 이강수 | Member for decreasing impact and noise |
| CN104230285A (en) * | 2014-08-15 | 2014-12-24 | 五河鼎顺新型建材有限公司 | Unfired hollow brick and preparation method thereof |
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