阅读说明：本技术 用于发动机进气管的片材及其制备方法，以及应用该片材的发动机进气管 (Sheet for engine air inlet pipe, preparation method of sheet and engine air inlet pipe applying sheet ) 是由 李应哲 尹泰珉 于 2019-10-31 设计创作，主要内容包括：本发明涉及用于发动机进气管的片材及其制备方法,以及应用该片材的发动机进气管。用于发动机进气管的片材,包括：第一材料层,其包含PET和低熔点纤维；第二材料层,其包含PP/PE、PET和低熔点纤维；第三材料层,其包含PP纺粘层；第四材料层,其包含PP/PE、PET和低熔点纤维；第五材料层,其包含PET和低熔点纤维；第六材料层,其包含PP/PE、PET和低熔点纤维；其中,相变材料的粒子分散在所述第二材料层、第三材料层、第四材料层以及第五材料层；所述相变材料的熔点在47℃～65℃范围以内。通过本发明,使通过进气管进入发动机的进气的温度保持在一定温度范围内从而有利于燃料在发动机中充分燃烧,并提高了发动机燃料效率而且可以增加发动机的扭矩。(The invention relates to a sheet material for an engine air inlet pipe, a preparation method of the sheet material and the engine air inlet pipe applying the sheet material. A sheet for an engine intake pipe, comprising: a first material layer comprising PET and low-melting fibers; a second material layer comprising PP/PE, PET and low-melting fibers; a third material layer comprising a PP spunbond layer; a fourth material layer comprising PP/PE, PET and low-melting fibers; a fifth material layer comprising PET and low-melting fibers; a sixth material layer comprising PP/PE, PET and low-melting fibers; wherein the particles of the phase change material are dispersed in the second material layer, the third material layer, the fourth material layer and the fifth material layer; the melting point of the phase-change material is within the range of 47-65 ℃. The invention can keep the temperature of the air inlet entering the engine through the air inlet pipe in a certain temperature range, thereby being beneficial to the full combustion of the fuel in the engine, improving the fuel efficiency of the engine and increasing the torque of the engine.)

1. A sheet for an engine intake pipe, characterized in that the sheet comprises:

a first material layer comprising PET and low-melting fibers;

a second material layer comprising PP/PE, PET and low-melting fibers;

a third material layer comprising a PP spunbond layer;

a fourth material layer comprising PP/PE, PET and low-melting fibers;

a fifth material layer comprising PET and low-melting fibers;

a sixth material layer comprising PP/PE, PET and low-melting fibers;

wherein the particles of the phase change material are dispersed in the second material layer, the third material layer, the fourth material layer and the fifth material layer; the melting point of the phase-change material is within the range of 47-65 ℃.

2. The sheet for an engine intake pipe according to claim 1, wherein the phase change material comprises: paraffin wax.

3. The sheet for an engine intake pipe according to claim 1, wherein the phase change material is contained in the sheet in an amount of 5 to 20% by mass.

4. The sheet for an engine intake pipe according to claim 1, wherein the content of the low-melting-point fiber in the first material layer is 30 to 60% by mass ratio.

5. The sheet for an engine intake pipe according to claim 1, wherein the content of the low-melting-point fiber in the sixth material layer is 30 to 60% by mass ratio.

6. The sheet for an engine intake pipe according to claim 1, wherein the sheet further comprises an NVH adjusting layer; the NVH adjusting layer is formed on the outer side of the first material layer; the NVH adjustment layer includes: PET and low melting fibers.

7. The sheet for an engine intake pipe according to claim 6, wherein the NVH adjusting layer contains 70 to 90% by mass of the PET and 10 to 30% by mass of the low-melting-point fiber.

8. The sheet for an engine intake pipe according to claim 6, wherein the NVH adjusting layer has particles of the phase change material dispersed therein.

9. The sheet for an engine intake pipe according to claim 6, wherein the NVH adjusting layer has a thickness of 0.5mm to 0.8 mm.

10. A method of making a sheet for an engine air intake, the method comprising:

a first step in which a sheet raw material is immersed in a first solution containing a phase change material, subjected to moisture absorption drying, to obtain an immersed and dried sheet material; wherein the sheet stock material comprises: the first, second, third, fourth, fifth, and sixth material layers of claim 1;

a second step in which the impregnated and dried sheet material is subjected to a hot pressing process and a cooling process to obtain a final sheet.

11. The method of claim 10, wherein the phase change material comprises: paraffin wax.

12. The method of claim 10, wherein the first solution comprising a phase change material comprises: paraffin wax, adhesive, cross-linking agent and water; according to the mass ratio, the content of the paraffin is 40-50%, the content of the adhesive is 17-19%, the content of the cross-linking agent is 1-3%, and the content of the water is 30-40%.

13. The method of claim 12, wherein the first solution containing the phase change material is prepared by mixing the paraffin, the binder, the cross-linking agent, and water at a temperature of 50 ℃ to 70 ℃.

14. The method of claim 10, wherein the first step, the impregnation and the moisture absorption drying process is performed at an operating temperature of 50 ℃ to 70 ℃.

15. The method of claim 10, wherein in the second step, the hot pressing process comprises the steps of: and heating the sheet material, introducing the sheet material into a mold, and performing compression molding, wherein the temperature of an upper mold of the mold corresponding to the first material layer is 200-220 ℃, and the temperature of a lower mold is 140-180 ℃.

16. The method of claim 10, further comprising an NVH tuning layer forming step comprising: a preparation step of the NVH adjustment layer and a hot press molding step.

17. The method of claim 16, wherein the NVH tuning layer comprises raw materials of: PET and low melting fibers.

18. The method of claim 16, wherein before the preparing step and the hot press forming step, the raw material of the NVH adjusting layer is immersed in a second solution containing a phase change material, and is subjected to moisture absorption and drying to disperse the phase change material in the raw material of the NVH adjusting layer.

19. The method of claim 18, wherein the second solution containing the phase change material comprises, when impregnating the raw material of the NVH adjustment layer: paraffin wax, adhesive, cross-linking agent and water; according to the mass ratio, the content of the paraffin is 30-40%, the content of the adhesive is 17-19%, the content of the cross-linking agent is 1-3%, and the content of the water is 40-50%.

20. The method of manufacturing of claim 16, wherein the step of preparing the NVH tuning layer comprises: and (3) enabling the raw material of the NVH adjusting layer to be subjected to a needling process to form the NVH fluffy layer with air holes.

21. The production method according to claim 20, wherein the step of hot press forming the NVH adjustment layer is performed after the second step; the hot press molding step of the NVH adjusting layer specifically comprises the following steps: and attaching the NVH fluffy layer to the sheet formed in the second step, performing a secondary hot pressing process, and cooling to form a final NVH adjusting layer.

22. The method of claim 21, wherein the temperature of the upper mold of the mold during the secondary hot pressing is 150 ℃ to 180 ℃.

23. An engine intake duct, characterized in that the engine intake duct includes: the sheet material of any one of claims 1 to 9.

Technical Field

The invention relates to a sheet material for an engine air inlet pipe, a preparation method of the sheet material and the engine air inlet pipe applying the sheet material.

Background

With the development of technology and environmental changes, the requirements of users for automobiles are becoming higher and higher. In order to protect the environment and reduce the maintenance cost of the vehicle, and to make the amount of exhaust gas of the vehicle small, improve fuel efficiency and provide comfortable drivability to the driver, the performance of the vehicle also needs to be greatly improved. In addition, the requirements for pollutants emitted by the combustion of an engine in the "national six" motor vehicle pollutant exhaust emission standard applicable in china are becoming more and more stringent. It is therefore necessary to sufficiently combust the fuel in the engine.

An air intake system of an engine is used to provide fresh air required for combustion to a vehicle engine, an air intake pipe in the air intake system guides the fresh air outside an engine cavity to an air cleaner, and the fresh air is supplied into the engine through the air intake pipe and the air cleaner. In the prior art, the air inlet pipe is generally formed by compressing and welding multiple layers of PET materials together to form a pipe which can maintain the shape of a pipe and has certain rigidity, and the pipe also has a better coating film for preventing water/impurities from flowing in. However, the intake pipe in the prior art has been unable to effectively prevent the heat generated by the engine from being conducted to the fresh air in the intake pipe, so the oxygen content in each volume of fresh air is reduced, further resulting in insufficient combustion of the engine, reduced fuel efficiency and the subsequent reduction of the overall performance of the engine.

Therefore, development of a new intake duct having excellent heat insulation and sound absorption properties while maintaining excellent waterproof and anti-impurity properties and rigidity of the related art intake duct has become necessary.

The above statements in the background are merely intended to facilitate a thorough understanding of the present disclosure (including the technical means used, technical problems solved and technical advantages brought about) and should not be taken as an acknowledgement or any form of suggestion that this information forms part of the prior art already known to a person skilled in the art.

Disclosure of Invention

The invention aims to overcome the defects that the temperature of air entering an engine through an air inlet pipe of the engine is high, the combustion of the engine is insufficient, and the fuel efficiency and the performance of the engine are reduced in the prior art, and provides a completely novel sheet for the air inlet pipe of the engine, a preparation method and application thereof, and the air inlet pipe of the engine using the sheet. The invention can keep the temperature of the air inlet entering the engine through the air inlet pipe of the engine in a certain temperature range, thereby being beneficial to the full combustion of the fuel in the engine, improving the fuel efficiency of the engine and increasing the torque of the engine.

The present invention provides a sheet for an engine intake pipe, comprising:

a first material layer comprising PET and low-melting fibers;

a second material layer comprising PP/PE, PET and low-melting fibers;

a third material layer comprising a PP spunbond layer;

a fourth material layer comprising PP/PE, PET and low-melting fibers;

a fifth material layer comprising PET and low-melting fibers;

a sixth material layer comprising PP/PE, PET and low-melting fibers;

wherein the particles of the phase change material are dispersed in the second material layer, the third material layer, the fourth material layer and the fifth material layer; the melting point of the phase-change material is within the range of 47-65 ℃.

The first material layer to the sixth material layer are sequentially stacked in this order.

The PET is a material commonly used in the art, and is fully called polyethylene terephthalate, and is generally present in the material layer in the form of polymer plastic.

The low-melting-point fiber is a material commonly used in the field, is a fiber tissue, is produced by composite spinning of common polyester and modified polyester, and has a melting point within the range of 150-180 ℃.

The PP/PE is a commonly used material in the field, the PP is polypropylene, the PE is polyethylene, and the PP/PE is a plastic material formed by polypropylene and polyethylene.

The Phase Change Material (PCM-Phase Change Material) is a substance that changes the state of a substance and can provide latent heat at a constant temperature. The process of changing the physical properties of a phase change material is called a phase change process, for example, a physical change process between mutually different states from a solid state to a liquid state, or from a liquid state to a solid state, in which the phase change material absorbs or releases a large amount of latent heat. The invention obtains a brand new sheet material by matching the specific phase change material with the specific material layers integrally, so that the air inlet pipe containing the sheet material can effectively prevent the heat of the engine from being conducted to the fresh air, and the air inlet temperature is kept in a certain range.

In some embodiments, the phase change material comprises: paraffin wax.

In some embodiments, the phase change material is paraffin.

The paraffin is also called crystal form wax, is a hydrocarbon mixture with 18-30 carbon atoms, and mainly comprises straight-chain paraffin, a small amount of paraffin with individual branched chains and monocyclic cycloalkane with long side chains. Is usually a white, odorless waxy solid, melts at 47 deg.C-65 deg.C, and has a density of about 0.9g/cm³The solvent is soluble in nonpolar solvents such as gasoline, carbon disulfide, dimethylbenzene, diethyl ether, benzene, chloroform, carbon tetrachloride, naphtha and the like, and is insoluble in polar solvents such as water, methanol and the like. Paraffin is a good heat storage material, and the specific heat capacity of the paraffin is 2.14-2.9 J.g^–1·K^–1The heat of fusion is 200-^–1。

In some embodiments, the phase change material is present in the sheet in an amount of 5% to 20% by mass.

In some embodiments, the content of the low-melting-point fiber in the first material layer is 30% to 60%, preferably 40% to 60%, by mass ratio.

In some embodiments, the content of the low-melting-point fiber in the sixth material layer is 30% to 60%, preferably 40% to 60%, by mass ratio.

The phase change material in the pipe can generate tiny volume change when changing phase, and the pipe can slightly bulge after long-time use, and the phenomenon of phase change material loss can be generated along with the increase of the running time, and the air inlet temperature reducing effect of the air inlet pipe can be gradually weakened after long-time use. In a preferred embodiment of the present invention, the first material layer and the sixth material layer contain low-melting-point fibers in a specific content, and the first material layer and the sixth material layer cooperate with other material layers to realize the following functions as a whole: the air inlet pipe made of the sheet material of the invention can not generate volume change, thereby always keeping the original tubular shape of the air inlet pipe and avoiding the loss phenomenon of phase change materials.

In some embodiments, the sheet may further comprise an NVH tuning layer; the NVH adjusting layer is formed on the outer side of the first material layer; the NVH adjustment layer includes: PET and low melting fibers.

NVH is an english abbreviation for Noise (Noise), Vibration (Vibration) and Harshness (Harshness), and is a comprehensive measure of automotive manufacturing quality. The NVH adjustment (NVH Tuning) is applied to the air inlet pipe, so that the air inlet pipe has better sound absorption and vibration prevention effects besides excellent thermal break-off performance. The NVH adjusting layer is formed on the outer side of the first material layer, namely, when the product sheet is formed into the air inlet pipe, the NVH adjusting layer is located on the outermost side of the air inlet pipe.

In the NVH adjusting layer, the content of the PET is 70-90% by mass ratio.

In the NVH adjusting layer, the content of the low-melting-point fibers is 10-30% by mass ratio.

In some preferred embodiments, the NVH adjusting layer has particles of a phase change material dispersed therein.

The thickness of the NVH adjusting layer is preferably 0.5 mm-0.8 mm.

The invention provides a method for preparing a sheet for an engine air inlet pipe, which comprises the following steps:

a first step in which a sheet raw material is immersed in a first solution containing a phase change material, subjected to moisture absorption drying, to obtain an immersed and dried sheet material; wherein the sheet stock material comprises: a first material layer, a second material layer, a third material layer, a fourth material layer, a fifth material layer, and a sixth material layer as described above;

a second step in which the impregnated and dried sheet material is subjected to a hot pressing process and a cooling process to obtain a final sheet.

In some embodiments, the phase change material comprises: paraffin wax.

In some embodiments, the phase change material is paraffin.

In some embodiments, the first solution comprising a phase change material comprises: paraffin wax, adhesive, cross-linking agent and water; according to the mass ratio, the content of the paraffin is 40-50%, the content of the adhesive is 17-19%, the content of the cross-linking agent is 1-3%, and the content of the water is 30-40%.

Regarding the first solution containing the phase change material, it is preferable to prepare the first solution containing the phase change material by mixing the paraffin, the binder, the cross-linking agent, and water at a temperature of 50 to 70 ℃.

In the above first step, the impregnation process and the moisture absorption and drying process may use a conventional operation process in the art as long as the above phase change material can be uniformly dispersed in the sheet raw material. In some preferred embodiments, the above-mentioned impregnation and moisture-absorption drying process is carried out at an operating temperature of 50 ℃ to 70 ℃. The hygroscopic drying process is preferably accomplished by adding a hygroscopic agent. As the moisture absorbent, those conventionally commercially available in the art can be used. In the first step, the content of the phase change material dispersed in the sheet raw material may be adjusted by the number and time of the dipping and moisture absorption drying, and the content of the phase change material dispersed in the sheet raw material may be increased as the number of times is larger and the time is longer.

In the above-mentioned second step, the hot pressing process and the cooling process may use a conventional operation process in the art. In some preferred embodiments, the hot pressing process comprises the following steps: and heating the sheet material, introducing the sheet material into a mold, and performing compression molding, wherein the temperature of an upper mold of the mold corresponding to the first material layer is 200-220 ℃, and the temperature of a lower mold is 140-180 ℃.

And the phase change material in the finally obtained sheet is dispersed in the second material layer, the third material layer, the fourth material layer and the fifth material layer, and substances contained in the first material layer and the sixth material layer are subjected to hot press forming to form a closed coating film.

In some embodiments, the method of preparing the sheet further comprises an NVH adjusting layer forming step comprising: a preparation step of the NVH adjustment layer and a hot press molding step.

The raw material of the NVH adjustment layer includes: PET and low melting fibers.

Preferably, before the preparing step and the hot press forming step, the raw material of the NVH adjustment layer may be immersed in a second solution containing a phase change material, and the phase change material may be dispersed in the raw material of the NVH adjustment layer by moisture absorption and drying. The moisture-absorption drying process is the same as the moisture-absorption drying process already mentioned above, as long as the phase change material is dispersed in the raw material. The content of the phase change material dispersed in the raw material of the NVH adjusting layer is not particularly limited as long as it is satisfied to contain the phase change material. Conventionally, after the above moisture absorption and drying process, the content of the phase change material dispersed in the raw material of the NVH adjustment layer is 5% to 8% by mass ratio.

The second solution containing the phase change material includes, when impregnating the raw material of the NVH adjustment layer: paraffin wax, adhesive, cross-linking agent and water; according to the mass ratio, the content of the paraffin is 30-40%, the content of the adhesive is 17-19%, the content of the cross-linking agent is 1-3%, and the content of the water is 40-50%.

The preparation step of the NVH adjustment layer includes: and (3) enabling the raw material of the NVH adjusting layer to be subjected to a needling process to form the NVH fluffy layer with air holes. The needling process may use needling processes conventional in the art. Preferably, the thickness of the NVH fluffy layer is 3 mm-5 mm.

The step of hot press forming the NVH adjustment layer is performed after the second step; the hot press molding step of the NVH adjusting layer specifically comprises the following steps: and attaching the NVH fluffy layer to the sheet formed in the second step, performing a secondary hot pressing process, and cooling to form a final NVH adjusting layer.

The secondary hot pressing process may use a hot pressing process that is conventional in the art. The temperature of an upper die of the die in the secondary hot pressing process is 150-180 ℃; the temperature of the lower mold may be room temperature.

The thickness of the NVH adjustment layer in the finally obtained sheet after the hot pressing process and the cooling process is preferably 0.5mm to 0.8 mm.

The present invention provides an engine intake duct, including: a sheet material as described above.

In some embodiments, the engine air intake pipe is made of a sheet material as described above.

In the invention, the phase change material in the air inlet pipe can be adjusted based on the use area and the use temperature of the vehicle, the phase change material with higher melting point is used in the area with higher temperature and the content of the phase change material in the air inlet pipe is adjusted to be higher, and the phase change material with lower melting point is used in the area with lower temperature and the content of the phase change material in the air inlet pipe is adjusted to be lower.

The present invention provides the use of a sheet as described above.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The reagents and starting materials used in the present invention are commercially available.

The positive progress effects of the invention are as follows: the phase-change material is dispersed in the air inlet pipe of the sheet material, so that the temperature of air inlet entering the engine through the air inlet pipe of the engine is kept within a certain temperature range, the fuel is favorably and fully combusted in the engine, the fuel efficiency of the engine is improved, the torque of the engine can be increased, the comfortable driving feeling is provided for a driver, and the integral vehicle maintenance cost of a client can be reduced. In addition, the content of low-melting-point fibers in the first material layer and the sixth material layer of the sheet is increased, and a coating film of the low-melting-point fibers is formed by using a specific hot-pressing cooling forming technology, so that the problems of bulging of the air inlet pipe in the using process and gradual loss of the phase-change material along with time are solved, and the durability is improved. Furthermore, the outermost layer of the upper part of the sheet material is matched with the NVH adjusting layer, so that the air inlet pipe has better sound absorption and vibration prevention effects besides excellent thermal breaking performance.

Detailed Description

The present invention is further illustrated by the following examples, but the present invention is not limited thereby within the scope of the examples described, but various modifications and changes can be made by those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present application.

The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.

Example 1

Preparing a first solution comprising a phase change material: the paraffin, the adhesive, the cross-linking agent and the water are put into a raw material tank and evenly mixed at the temperature of 50 ℃, and the content ratio of the solution is 40 percent of paraffin, 17 percent of adhesive, 3 percent of cross-linking agent and 40 percent of water in sequence according to the mass ratio.

Adding the raw material of the sheet and the moisture absorbent to the prepared first solution containing the phase change material, and performing moisture absorption drying at a temperature of 50 ℃ to obtain an impregnated and dried sheet material.

The raw materials of the sheet include: a first layer of material comprising PET and low-melt fibers; a second material layer comprising PP/PE, PET and low melting point fibers; a third material layer comprising a PP spunbond layer; a fourth material layer comprising PP/PE, PET and low melting point fibers; a fifth material layer comprising PET and low-melting fibers and a sixth material layer comprising PP/PE, PET and low-melting fibers; the first material layer to the sixth material layer are sequentially stacked, and the content of the low-melting-point fibers in the first material layer is 40% by mass; the content of the low-melting-point fibers in the sixth material layer is 40% by mass.

After the raw material of the sheet was subjected to the above impregnation and moisture absorption drying, the particles of paraffin were uniformly dispersed therein to obtain an impregnated and dried sheet material.

And heating the sheet material, performing hot press molding on the sheet material by using a compression molding die (the temperature of an upper die of the die corresponding to the first material layer is 200 ℃, and the temperature of a lower die corresponding to the sixth material layer is 160 ℃), and cooling to obtain the product sheet. In the product sheet, paraffin particles are uniformly dispersed in the second material layer to the fifth material layer after hot pressing, a part of the originally dispersed paraffin particles in the first material layer and the sixth material layer are lost, a part of the originally dispersed paraffin particles enter the second material layer to the fifth material layer, and finally, the upper outermost layer and the lower outermost layer of the product sheet are coating films formed by melting PET and low-melting-point fibers and almost do not contain paraffin particles. In the final product sheet of this example, the content of paraffin was 5% by mass.

Example 2

Preparing a first solution comprising a phase change material: the paraffin, the adhesive, the cross-linking agent and the water are put into a raw material tank and evenly mixed at the temperature of 70 ℃, and the content ratio of the solution is 50 percent of paraffin, 19 percent of adhesive, 1 percent of cross-linking agent and 30 percent of water in sequence according to the mass ratio.

Adding the raw material of the sheet and the moisture absorbent to the prepared first solution containing the phase change material, and performing moisture absorption drying at a temperature of 70 ℃ to obtain an impregnated and dried sheet material.

The raw materials of the sheet include: a first layer of material comprising PET and low-melt fibers; a second material layer comprising PP/PE, PET and low melting point fibers; a third material layer comprising a PP spunbond layer; a fourth material layer comprising PP/PE, PET and low melting point fibers; a fifth material layer comprising PET and low-melting fibers and a sixth material layer comprising PP/PE, PET and low-melting fibers; the first material layer to the sixth material layer are sequentially stacked, and the content of the low-melting-point fibers in the first material layer is 60% by mass; the content of the low-melting-point fibers in the sixth material layer is 60% by mass ratio.

After the raw material of the sheet was subjected to the above impregnation and moisture absorption drying, the particles of paraffin were uniformly dispersed therein to obtain an impregnated and dried sheet material.

And heating the sheet material, performing hot press molding on the sheet material by using a compression molding die (the temperature of an upper die of the die corresponding to the first material layer is 200 ℃, and the temperature of a lower die corresponding to the sixth material layer is 160 ℃), and cooling to obtain the product sheet. In the product sheet, paraffin particles are uniformly dispersed in the second material layer to the fifth material layer after hot pressing, after the hot pressing process, a part of the originally dispersed paraffin particles in the first material layer and the sixth material layer are lost, a part of the originally dispersed paraffin particles enter the second material layer to the fifth material layer, and finally, the upper outermost layer and the lower outermost layer of the sheet are coating films formed by melting PET and low-melting-point fibers and almost do not contain paraffin particles. In the final product sheet of this example, the content of paraffin was 20% by mass ratio.

Example 3

Preparing a first solution comprising a phase change material: the paraffin, the adhesive, the cross-linking agent and the water are put into a raw material tank and evenly mixed at the temperature of 58 ℃, and the content ratio of the solution is 45 percent of paraffin, 18 percent of adhesive, 2 percent of cross-linking agent and 35 percent of water in sequence according to the mass ratio.

Adding the raw material of the sheet and the moisture absorbent to the prepared first solution containing the phase change material, and performing moisture absorption drying at a temperature of 58 ℃ to obtain an impregnated and dried sheet material.

The raw materials of the sheet include: a first layer of material comprising PET and low-melt fibers; a second material layer comprising PP/PE, PET and low melting point fibers; a third material layer comprising a PP spunbond layer; a fourth material layer comprising PP/PE, PET and low melting point fibers; a fifth material layer comprising PET and low-melting fibers and a sixth material layer comprising PP/PE, PET and low-melting fibers; the first material layer to the sixth material layer are sequentially stacked, and the content of the low-melting-point fibers in the first material layer is 50% by mass; the content of the low-melting-point fibers in the sixth material layer is 50% by mass.

After the raw material of the sheet was subjected to the above impregnation and moisture absorption drying, the particles of paraffin were uniformly dispersed therein to obtain an impregnated and dried sheet material.

And heating the sheet material, performing hot press molding on the sheet material by using a compression molding die (the temperature of an upper die of the die corresponding to the first material layer is 200 ℃, and the temperature of a lower die corresponding to the sixth material layer is 160 ℃), and cooling to obtain the product sheet. In the product sheet, paraffin particles are uniformly dispersed in the second material layer to the fifth material layer after hot pressing, after the hot pressing process, a part of the originally dispersed paraffin particles in the first material layer and the sixth material layer are lost, a part of the originally dispersed paraffin particles enter the second material layer to the fifth material layer, and finally, the upper outermost layer and the lower outermost layer of the sheet are coating films formed by melting PET and low-melting-point fibers and almost do not contain paraffin particles. In the final product sheet of this example, the content of paraffin was 12% by mass.

Example 4

Preparing a first solution comprising a phase change material: the paraffin, the adhesive, the cross-linking agent and the water are put into a raw material tank and evenly mixed at the temperature of 50 ℃, and the content ratio of the solution is 45 percent of the paraffin, 18 percent of the adhesive, 2 percent of the cross-linking agent and 35 percent of the water in sequence according to the mass ratio.

Adding the raw material of the sheet and the moisture absorbent to the prepared first solution containing the phase change material, and performing moisture absorption drying at a temperature of 50 ℃ to obtain an impregnated and dried sheet material.

The raw materials of the sheet include: a first layer of material comprising PET and low-melt fibers; a second material layer comprising PP/PE, PET and low melting point fibers; a third material layer comprising a PP spunbond layer; a fourth material layer comprising PP/PE, PET and low melting point fibers; a fifth material layer comprising PET and low-melting fibers and a sixth material layer comprising PP/PE, PET and low-melting fibers; the first material layer to the sixth material layer are sequentially stacked, and the content of the low-melting-point fibers in the first material layer is 50% by mass; the content of the low-melting-point fibers in the sixth material layer is 50% by mass.

After the raw material of the sheet was subjected to the above impregnation and moisture absorption drying, the particles of paraffin were uniformly dispersed therein to obtain an impregnated and dried sheet material.

After heating the sheet material, carrying out first hot press molding on the sheet material by using a compression molding die (the temperature of an upper die of the die corresponding to the first material layer is 200 ℃, and the temperature of a lower die corresponding to the sixth material layer is 160 ℃), and cooling to obtain the product sheet. In the product sheet, paraffin particles are uniformly dispersed in the second material layer to the fifth material layer after hot pressing, and after the hot pressing process, part of the originally dispersed paraffin particles in the first material layer and the sixth material layer are lost and part of the originally dispersed paraffin particles enter the second material layer to the fifth material layer. The upper and lower outermost layers of the sheet after the first hot press molding are coating films formed by melting PET and low-melting-point fibers, and almost do not contain paraffin particles.

Preparing a second solution containing a phase change material: the paraffin, the adhesive, the cross-linking agent and the water are put into a raw material tank and evenly mixed at the temperature of 50 ℃, and the content ratio of the solution is 35 percent of paraffin, 18 percent of adhesive, 2 percent of cross-linking agent and 45 percent of water in sequence according to the mass ratio.

The raw material of the NVH adjusting layer comprising 80% of PET and 20% of low-melting point fibers (the compounding ratio of PET and low-melting point fibers is in mass ratio) was immersed in the second solution containing the phase change material prepared above, and subjected to moisture absorption drying at a temperature of 50 ℃ to uniformly disperse the phase change material in the raw material of the NVH adjusting layer. Next, the raw material of the NVH adjusting layer containing the phase change material was subjected to a needle punching process to form an NVH bulky layer having pores, the NVH bulky layer having a thickness of 3 mm. Attaching the NVH fluffy layer to the uppermost layer (the side corresponding to the first material layer) of the sheet subjected to the first hot press molding, performing a second hot press molding process (the temperature of an upper die corresponding to the uppermost layer of the sheet is 150 ℃, the temperature of a lower die is room temperature), and cooling to form a final sheet, wherein the NVH adjusting layer is formed on the uppermost layer of the sheet and has the thickness of 0.5 mm.

In the final product sheet of this example, the content of paraffin was 12% by mass.

Example 5

Preparing a first solution comprising a phase change material: the paraffin, the adhesive, the cross-linking agent and the water are put into a raw material tank and evenly mixed at the temperature of 50 ℃, and the content ratio of the solution is 50 percent of the paraffin, 19 percent of the adhesive, 1 percent of the cross-linking agent and 30 percent of the water in sequence according to the mass ratio.

Adding the raw material of the sheet and the moisture absorbent to the prepared first solution containing the phase change material, and performing moisture absorption drying at a temperature of 50 ℃ to obtain an impregnated and dried sheet material.

The raw materials of the sheet include: a first layer of material comprising PET and low-melt fibers; a second material layer comprising PP/PE, PET and low melting point fibers; a third material layer comprising a PP spunbond layer; a fourth material layer comprising PP/PE, PET and low melting point fibers; a fifth material layer comprising PET and low-melting fibers and a sixth material layer comprising PP/PE, PET and low-melting fibers; the first material layer to the sixth material layer are sequentially stacked, and the content of the low-melting-point fibers in the first material layer is 60% by mass; the content of the low-melting-point fibers in the sixth material layer is 60% by mass ratio.

After the raw material of the sheet was subjected to the above impregnation and moisture absorption drying, the particles of paraffin were uniformly dispersed therein to obtain an impregnated and dried sheet material.

After heating the sheet material, carrying out first hot press molding on the sheet material by using a compression molding die (the temperature of an upper die of the die corresponding to the first material layer is 200 ℃, and the temperature of a lower die corresponding to the sixth material layer is 160 ℃), and cooling to obtain the product sheet. In the product sheet, paraffin particles are uniformly dispersed in the second material layer to the fifth material layer after hot pressing, and after the hot pressing process, part of the originally dispersed paraffin particles in the first material layer and the sixth material layer are lost and part of the originally dispersed paraffin particles enter the second material layer to the fifth material layer. The upper and lower outermost layers of the sheet after the first hot press molding are coating films formed by melting PET and low-melting-point fibers, and almost do not contain paraffin particles.

Preparing a second solution containing a phase change material: the paraffin, the adhesive, the cross-linking agent and the water are put into a raw material tank and evenly mixed at the temperature of 50 ℃, and the content ratio of the solution is 40 percent of paraffin, 19 percent of adhesive, 1 percent of cross-linking agent and 40 percent of water in sequence according to the mass ratio.

The raw material of the NVH adjusting layer comprising 80% of PET and 20% of low-melting point fibers (the compounding ratio of PET and low-melting point fibers is in mass ratio) was immersed in the second solution containing the phase change material prepared above, and subjected to moisture absorption drying at a temperature of 50 ℃ to uniformly disperse the phase change material in the raw material of the NVH adjusting layer. Next, the raw material of the NVH adjusting layer containing the phase change material was subjected to a needle punching process to form an NVH bulky layer having pores, the NVH bulky layer having a thickness of 5 mm. Attaching the NVH fluffy layer to the uppermost layer (the side corresponding to the first material layer) of the sheet subjected to the first hot press molding, performing a second hot press molding process (the temperature of an upper die corresponding to the uppermost layer of the sheet is 180 ℃, the temperature of a lower die is room temperature), and cooling to form a final sheet, wherein the NVH adjusting layer is formed on the uppermost layer of the sheet and has the thickness of 0.8 mm.

In the final product sheet of this example, the content of paraffin was 20% by mass ratio.

Effects of the embodiment

An air inlet duct bent into a tubular shape was formed using the product sheet produced by the above examples 1 to 5, and this air inlet duct was subjected to a heat insulating effect test and an NVH test.

The insulation effectiveness test is carried out by means of instruments and methods commonly used in the art. According to the invention, a temperature sensor is arranged at the inlet of an air inlet pipe of a vehicle to measure the air temperature at the air inlet, a temperature sensor is arranged at the inlet of a pressure stabilizing groove of an engine of the vehicle to measure the air temperature at the inlet of the pressure stabilizing groove, and the heat insulation effect of the air inlet pipe is detected by comparison.

Item	Ambient temperature/. degree.C	Air temperature/deg.C at the air inlet	Air temperature/deg.C at inlet of pressure stabilizing tank
				Example 1	25	40	41.5
Example 2	38	59	61
				Example 3	30	48	49.3
Example 4	25	40	41.0
				Example 5	25	40	40.7

Here, the correlation between the intake air temperature change and the fuel efficiency and power performance is explained in detail. The correlation between the intake air temperature and the fuel efficiency is as follows: when the air inlet temperature of the engine is increased by 10 ℃, the fuel efficiency of the engine is reduced by 1 percent, and the torque of the engine is also reduced by 3 percent.

When the intake air temperature rises, the knock ignition timing is advanced and the oxygen content in the dosing volume is reduced, thus affecting the engine fuel efficiency. The intake air temperature rises and accordingly the engine torque also decreases. When the air inlet temperature is very low (the air inlet temperature is less than 25 ℃), the torque is also reduced, so that the air inlet temperature is kept in a stable range, heat generated by the engine is prevented from reaching the air inlet in the air inlet pipe, the air inlet temperature at the inlet of the air inlet pipe and the air inlet temperature entering the engine are kept unchanged as much as possible, and the fuel efficiency of the engine is improved and the torque is improved.

The torque change is calculated by the following equation: (atmospheric pressure in kpa, suction temperature in ℃)

Torque (99.06/atmosphere-partial pressure of water vapor)^1.2X (suction temperature +273/298)^0.6

NVH testing can be performed by apparatus and methods commonly used in the art. In the invention, NVH test is carried out by using LMS (least mean square) test equipment and LMS test software, specifically, a test microphone 1 is arranged at a position 100mm away from the outer side of a tube body, a microphone 2 is arranged at the front part in a vehicle chamber, and data read by each microphone is measured under a full throttle (0 rpm-6000 rpm) according to a vehicle acceleration test method.

As can be seen from the above embodiments and effect embodiments, the phase change material is dispersed in the intake pipe of the sheet material, so that the temperature of the intake air entering the engine through the intake pipe of the engine is kept within a certain temperature range, thereby facilitating the sufficient combustion of fuel in the engine, improving the fuel efficiency of the engine and increasing the torque of the engine, thereby providing a comfortable driving feeling for a driver and reducing the overall maintenance cost of the vehicle for a customer. In addition, the content of low-melting-point fibers in the first material layer and the sixth material layer of the sheet is increased, and a coating film of the low-melting-point fibers is formed by using a specific hot-pressing cooling forming technology, so that the problems of bulging of the air inlet pipe in the using process and gradual loss of the phase-change material along with time are solved, and the durability is improved. Furthermore, the outermost layer of the upper part of the sheet material is matched with the NVH adjusting layer, so that the air inlet pipe has better sound absorption and vibration prevention effects besides excellent thermal breaking performance.