Refrigerator liner as well as preparation method and application thereof

Abstract

The invention relates to the technical field of household appliances, and provides a refrigerator inner container and a preparation method and application thereof.The refrigerator inner container is a peculiar smell removing refrigerator inner container and is formed by processing a polystyrene composite material, and the polystyrene composite material contains, by mass, 0.02% or more of nitrogen-doped titanium dioxide and 4.55% or less of carbon nanotubes. And the nitrogen-doped titanium dioxide is mainly located in pore channels of the carbon nanotubes and is used for removing peculiar smell components in the refrigerator. According to the polystyrene disclosed by the invention, the carbon nanotube / titanium dioxide compound with a specific structure is introduced, so that the mechanical property of the composite material is not obviously reduced when nitrogen-doped titanium dioxide with a relatively high addition amount is used; and the mechanical property of the refrigerator liner made of the polystyrene composite material and the problem of peculiar smell residue before a newly purchased refrigerator is opened are considered.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a refrigerator liner and a preparation method and application thereof. Background Art

[0002] Refrigerators are common electrical appliances in daily life. They are mainly composed of a box shell, a foaming layer and a refrigerator liner. The interior contains a large amount of plastic, foam and glue, which can slowly release low molecular weight volatile harmful substances (TVOC) with odor. Therefore, a newly purchased refrigerator will have odor emission when it is just unpacked or in daily use. The odor is formaldehyde, benzene, toluene, xylene and other substances, which have a strong irritating odor and have an adverse effect on the human body. During the daily use of the refrigerator, the odor substances continue to evaporate slowly, which has an adverse effect on the food quality and users inside the refrigerator. In particular, the odor of a newly purchased refrigerator is more significant when it is just unpacked, and the current technology for removing refrigerator odor cannot effectively solve this problem. For example, patent CN111735255B discloses a method for removing refrigerator odor, which uses the process of closing the refrigerator door to generate airflow, and the flow of airflow can discharge the odor from the refrigerator through a specific pipe; but the structure is relatively complex, the odor removal efficiency is low, and it is difficult to avoid the odor residue before the refrigerator is unpacked. For another example, patent CN113790556B discloses a method for removing odor from a refrigerator. The method utilizes a purification module and a guide fan. The purification substance released by the purification module is blown by the guide fan to achieve the purification effect of the purification substance on the odor. However, the purification module and the guide fan introduced by the method occupy the limited space in the refrigerator, resulting in a decrease in the utilization rate of the refrigerator space, and the use of the guide fan increases the energy consumption of the refrigerator. In addition, the method is also difficult to avoid the residual odor before the refrigerator is unpacked.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] In order to avoid occupying the limited space in the refrigerator, the refrigerator liner of the present invention has been studied in depth, and it is found that when polystyrene is used as the base material of the refrigerator liner, polystyrene can be optimized by means of modification, etc., which has great potential in reducing the problem of residual odor in newly purchased refrigerators before unpacking. However, in the actual research and development process, when carbon nanotubes are added to polystyrene, not only can the mechanical properties of polystyrene be effectively increased, but the adsorption capacity of carbon nanotubes for odor is also significantly better than other reinforcing materials (such as carbon nanofibers, amorphous carbon, etc.); but the experiment shows that in order to effectively solve the problem of residual odor in newly purchased refrigerators before unpacking, being able to adsorb odors is still not enough.

[0005] To this end, the present invention further proposes the idea of ​​introducing a functional component that can degrade / eliminate odor into a polystyrene composite material containing carbon nanotubes. A large number of experiments have verified that nitrogen-doped titanium dioxide has excellent photocatalytic properties and can effectively degrade and remove odor components of a newly purchased refrigerator before unpacking; however, when the nitrogen-doped titanium dioxide is used as a functional component in a polystyrene composite material containing carbon nanotubes, the mechanical properties of the composite material are significantly affected. In order to maintain the mechanical properties of the composite material, the addition amount of nitrogen-doped titanium dioxide can only be within 0.01%, which greatly weakens its role in degrading and removing odor components of a newly purchased refrigerator before unpacking.

[0006] In order to solve the above problems, the present invention provides a refrigerator liner and a preparation method and application thereof. Specifically, nitrogen-doped titanium dioxide is mainly located inside the pores of carbon nanotubes through a specific method. Through the structural design, it is unexpectedly found that the adsorption effect of the carbon nanotubes on odors in the structure will not be affected, and the structure ensures that when a higher amount of nitrogen-doped titanium dioxide is added, the mechanical properties of the composite material will not decrease significantly, and it is ensured that the nitrogen-doped titanium dioxide located in the carbon nanotubes can also efficiently degrade and remove odor components. The two work synergistically to achieve a balance between the mechanical properties of the refrigerator liner made of the polystyrene composite material and solving the problem of residual odor in a newly purchased refrigerator before unpacking.

[0007] Specifically, the present invention provides a refrigerator liner for removing odor, wherein the refrigerator liner is made of a polystyrene composite material, wherein the polystyrene composite material contains nitrogen-doped titanium dioxide at a mass ratio of more than 0.02% and carbon nanotubes at a mass ratio of less than 4.55%, and the nitrogen-doped titanium dioxide is mainly located inside the pores of the carbon nanotubes for removing odor components in the refrigerator. Preferably, the polystyrene composite material contains nitrogen-doped titanium dioxide at a mass ratio of more than 0.05%, and more preferably contains nitrogen-doped titanium dioxide at a mass ratio of more than 0.1%.

[0008] The polystyrene of the present invention is introduced into a carbon nanotube / titanium dioxide composite with a specific structure. The unique high specific surface area of ​​the carbon nanotube can realize the adsorption of odor molecules in the refrigerator, and the odor molecules can be adsorbed into the interior of the carbon nanotube pipe. The nitrogen-doped titanium dioxide distributed inside the carbon nanotube pipe can realize the catalytic degradation of the odor molecules. The method not only achieves the effect of eliminating the odor components of the newly purchased refrigerator before unpacking, but also continues to remove the odor components during the use of the refrigerator. More importantly, the positional relationship between the carbon nanotube and the nitrogen-doped titanium dioxide overcomes the technical difficulty that the mechanical properties of the polystyrene composite material are significantly reduced when the nitrogen-doped titanium dioxide is added in a high amount, and plays a key role in achieving the balance between the mechanical properties of the refrigerator liner of the polystyrene composite material and solving the problem of odor residue before unpacking the newly purchased refrigerator. The composite material is used to prepare the refrigerator liner, which can improve the mechanical strength of the liner and improve the impact resistance and low temperature resistance of the refrigerator liner during daily use. In addition, the refrigerator liner of the present invention is relative to the traditional refrigerator liner, and the carbon nanotubes introduced therein can also effectively achieve the antibacterial effect on bacteria such as Escherichia coli.

[0009] The odor components in the present invention include one or more of formaldehyde, benzene, toluene and xylene.

[0010] According to the deodorizing refrigerator liner provided by the present invention, the carbon nanotubes are single-walled carbon nanotubes activated by acid, and preferably, the particle size of the nitrogen-doped titanium dioxide is 5 to 10 nm.

[0011] According to the deodorizing refrigerator liner provided by the present invention, the nitrogen-doped titanium dioxide is first generated from a titanium dioxide precursor mainly located inside the carbon nanotube pores, and then obtained by calcining in a nitrogen-containing atmosphere.

[0012] According to the deodorizing refrigerator liner provided by the present invention, the titanium dioxide precursor is one or more of tetrabutyl titanate, isopropyl titanate and titanium tetrachloride.

[0013] According to the deodorizing refrigerator liner provided by the present invention, the polystyrene is one or more of ordinary polystyrene, expanded polystyrene, high impact polystyrene and syndiotactic polystyrene.

[0014] The present invention also provides a method for preparing the above-mentioned deodorizing refrigerator liner, comprising:

[0015] The carbon nanotubes are placed in an acidic solvent to remove impurities in the carbon nanotubes and introduce active groups (such as hydroxyl, carboxyl, etc.), and activated carbon nanotubes are obtained after removing the solvent; the solvent can be removed by centrifugation and drying; wherein the centrifugal speed is 8000-12000 rpm, the duration is 1-15 minutes, and the drying temperature is 100-130°C, and the duration is 10-30 hours.

[0016] The activated carbon nanotubes and the titanium dioxide precursor are mixed in a mass ratio of 100:(1-30) to obtain a mixture;

[0017] The mixture is first placed in an environment with a humidity of 90-100 RH% to generate titanium dioxide, and then calcined in a nitrogen-containing atmosphere to obtain nitrogen-doped titanium dioxide mainly located inside the pores of the carbon nanotubes, which is recorded as a carbon nanotube / titanium dioxide composite;

[0018] The carbon nanotube / titanium dioxide composite and polystyrene are used as raw materials to prepare an inner liner to obtain the refrigerator inner liner.

[0019] The preparation method of the refrigerator liner of the present invention is to first prepare a carbon nanotube / titanium dioxide composite, then mix the composite with polystyrene in a certain ratio to obtain a composite material for preparing the refrigerator liner, and finally use the composite material to perform molding processing on the refrigerator liner. By adjusting the mass ratio of the carbon nanotube to the titanium dioxide precursor, a composite with different titanium dioxide loadings in the carbon nanotube can be obtained, and by adjusting the mass ratio of the composite material to polystyrene, a liner with different deodorizing effects, different mechanical strengths and different antibacterial effects can be obtained.

[0020] According to the preparation method of the deodorizing refrigerator liner provided by the present invention, the mass ratio of the carbon nanotubes to the acidic solvent is (1-20):100, and the mixing time is 2-20 hours; preferably, the acidic solvent includes one or more of perchloric acid, hydroiodic acid, hydrobromic acid, hydrochloric acid, sulfuric acid and nitric acid.

[0021] According to the method for preparing the deodorizing refrigerator liner provided by the present invention, the time for generating titanium dioxide under the condition of an ambient humidity of 90 to 100 RH% is 10 to 30 hours.

[0022] According to the method for preparing the deodorizing refrigerator liner provided by the present invention, the nitrogen-containing atmosphere includes ammonia and / or nitrogen, and the gas flow rate is 1 to 100 sccm.

[0023] Preferably, the calcination temperature in the nitrogen-containing atmosphere is 200-400° C. and the calcination time is 2-10 h.

[0024] The present invention also provides the use of the above-mentioned deodorizing refrigerator liner.

[0025] The present invention provides a refrigerator liner and its preparation method and application. Through a specific method, nitrogen-doped titanium dioxide is mainly located inside the pores of carbon nanotubes. Through this structural design, it is unexpectedly found that the adsorption effect of carbon nanotubes on odors in this structure will not be affected, and the nitrogen-doped titanium dioxide located in the carbon nanotubes can also efficiently degrade and remove odor components. More importantly, this structure ensures that when a higher amount of nitrogen-doped titanium dioxide is used, the mechanical properties of the composite material will not decrease significantly, and the refrigerator liner of the polystyrene composite material is achieved. Take into account both the mechanical properties and the problem of odor residue in newly purchased refrigerators before unpacking. In addition, compared with traditional refrigerator liners, the carbon nanotubes introduced in the refrigerator liner of the present invention can also effectively achieve an antibacterial effect on bacteria such as Escherichia coli. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic flow chart of a method for preparing a refrigerator liner provided by the present invention;

[0028] Figure 2 This is a TEM image of the carbon nanotube / titanium dioxide composite provided by the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Combine the following Figure 1-Figure 2 The invention describes a refrigerator liner and a preparation method and application thereof.

[0031] The present invention provides the deodorizing refrigerator liner as described above, wherein the refrigerator liner is made of a polystyrene composite material, wherein the polystyrene composite material contains nitrogen-doped titanium dioxide in an amount of more than 0.1% by weight, and the nitrogen-doped titanium dioxide is mainly located inside the pores of the carbon nanotubes for removing odor components in the refrigerator.

[0032] According to the deodorizing refrigerator liner of the present invention as described above, the carbon nanotubes are single-walled carbon nanotubes activated by acid, and preferably, the particle size of the nitrogen-doped titanium dioxide is 5 to 10 nm.

[0033] According to the deodorizing refrigerator liner of the present invention as described above, the nitrogen-doped titanium dioxide is first generated from a titanium dioxide precursor mainly located inside the carbon nanotube pores, and then obtained by calcining in a nitrogen-containing atmosphere.

[0034] According to the deodorizing refrigerator liner of the present invention as described above, the titanium dioxide precursor is one or more of tetrabutyl titanate, isopropyl titanate and titanium tetrachloride.

[0035] According to the deodorizing refrigerator liner of the present invention as described above, the polystyrene is one or more of ordinary polystyrene, expanded polystyrene, high impact polystyrene and syndiotactic polystyrene.

[0036] The present invention also provides a method for preparing the above-mentioned deodorizing refrigerator liner, comprising:

[0037] The carbon nanotubes are placed in an acidic solvent to remove impurities in the carbon nanotubes and introduce active groups (such as hydroxyl, carboxyl, etc.), and activated carbon nanotubes are obtained after removing the solvent; the solvent can be removed by centrifugation and drying; wherein the centrifugal speed is 8000-12000 rpm, the duration is 1-15 minutes, and the drying temperature is 100-130°C, and the duration is 10-30 hours.

[0038] The activated carbon nanotubes and the titanium dioxide precursor are mixed in a mass ratio of 100:(1-30) to obtain a mixture;

[0039] The mixture is first placed in an environment with a humidity of 90-100 RH% to generate titanium dioxide, and then calcined in a nitrogen-containing atmosphere to obtain nitrogen-doped titanium dioxide mainly located inside the pores of the carbon nanotubes, which is recorded as a carbon nanotube / titanium dioxide composite;

[0040] The carbon nanotube / titanium dioxide composite and polystyrene are used as raw materials to prepare an inner liner to obtain the refrigerator inner liner.

[0041] According to the method for preparing a deodorizing refrigerator liner of the present invention as described above, the mass ratio of the carbon nanotubes to the acidic solvent is (1-20):100, and the mixing time is 2-20 hours; preferably, the acidic solvent includes one or more of perchloric acid, hydroiodic acid, hydrobromic acid, hydrochloric acid, sulfuric acid and nitric acid.

[0042] According to the method for preparing the deodorizing refrigerator liner of the present invention, the time for generating titanium dioxide under the condition of an ambient humidity of 90 to 100 RH% is 10 to 30 hours.

[0043] According to the method for preparing the deodorizing refrigerator liner of the present invention as described above, the nitrogen-containing atmosphere includes ammonia and / or nitrogen, and the gas flow rate is 1 to 100 sccm.

[0044] Preferably, the calcination temperature in the nitrogen-containing atmosphere is 200-400° C. and the calcination time is 2-10 h.

[0045] If no specific technology or conditions are specified in the examples, the technology or conditions described in the literature in this field or the product instructions are used. If no manufacturer is specified for the reagents or instruments used, they are all conventional products that can be purchased through regular channels. Among them, the carbon nanotubes of the present invention are the products of Shenzhen Nanoport Co., Ltd., and the polystyrene is the product of Zhenjiang Chimei Chemical Co., Ltd.

[0046] Example 1

[0047] A method for preparing a refrigerator liner, such as Figure 1 As shown, the steps are as follows:

[0048] (1) Take 1000 parts of nitric acid (concentration of 68 wt%) and 100 parts of carbon nanotubes, mix for 10 hours, and then use a centrifuge at a speed of 10,000 rpm for 5 minutes to remove the nitric acid. The carbon nanotubes treated with nitric acid are placed in an oven for drying at a drying temperature of 110° C. for 10 hours to obtain activated carbon nanotubes.

[0049] (2) Take 10 parts of tetrabutyl titanate and 50 parts of activated carbon nanotubes, mix them evenly, and then place the mixture in a 95% humidity environment for 15 hours to generate titanium dioxide. After the mixture is taken out of the humidity environment, it is calcined in an ammonia atmosphere with a gas flow rate of 50 sccm, a calcination temperature of 300°C, and a calcination time of 5 hours to obtain a carbon nanotube / titanium dioxide composite (whose structure is as shown in FIG. Figure 2 As shown), wherein the titanium dioxide is nitrogen-doped titanium dioxide after being calcined at high temperature in an ammonia atmosphere, and the mass content of nitrogen-doped titanium dioxide in the carbon nanotube / titanium dioxide composite is 4.48%.

[0050] (3) Take 5 parts of the carbon nanotube / titanium dioxide composite calcined at high temperature in step (2) and 100 parts of polystyrene to prepare a refrigerator liner to obtain a refrigerator liner.

[0051] Example 2

[0052] A method for preparing a refrigerator liner, wherein the steps are basically the same as those in Example 1, except that the only difference is step (3):

[0053] (3) Take 3 parts of the carbon nanotube / titanium dioxide composite calcined at high temperature in step (2) and 100 parts of polystyrene to prepare a refrigerator liner to obtain a refrigerator liner.

[0054] Example 3

[0055] A method for preparing a refrigerator liner, wherein the steps are basically the same as those in Example 1, except that the only difference is step (3):

[0056] (3) Take 1 part of the carbon nanotube / titanium dioxide composite calcined at high temperature in step (2) and 100 parts of polystyrene to prepare a refrigerator liner to obtain a refrigerator liner.

[0057] Example 4

[0058] A method for preparing a refrigerator liner, wherein the steps are basically the same as those of Example 1, except that the amount of tetrabutyl titanate in step (2) is reduced to 5 parts, and the mass content of nitrogen-doped titanium dioxide in the obtained carbon nanotube / titanium dioxide composite is 2.29%.

[0059] Example 5

[0060] A method for preparing a refrigerator liner, wherein the steps are basically the same as those in Example 4, except for step (3):

[0061] (3) Take 3 parts of the carbon nanotube / titanium dioxide composite calcined at high temperature in step (2) and 100 parts of polystyrene to prepare a refrigerator liner to obtain a refrigerator liner.

[0062] Example 6

[0063] A method for preparing a refrigerator liner, wherein the steps are basically the same as those in Example 4, except for step (3):

[0064] (3) Take 1 part of the carbon nanotube / titanium dioxide composite calcined at high temperature in step (2) and 100 parts of polystyrene to prepare a refrigerator liner to obtain a refrigerator liner.

[0065] Example 7

[0066] A method for preparing a refrigerator liner, wherein the steps are basically the same as those of Example 1, except that an equimolar amount of tetrabutyl titanate is replaced by isopropyl titanate.

[0067] Example 8

[0068] A method for preparing a refrigerator liner, wherein the steps are basically the same as those of Example 1, except that an equimolar amount of tetrabutyl titanate is replaced by titanium tetrachloride.

[0069] Example 9

[0070] A method for preparing a refrigerator liner, the steps of which are as follows:

[0071] (1) Take 1000 parts of nitric acid (concentration of 68 wt%) and 100 parts of carbon nanotubes, mix for 10 hours, and then use a centrifuge at a speed of 10,000 rpm for 5 minutes to remove the nitric acid. The carbon nanotubes treated with nitric acid are placed in an oven for drying at a drying temperature of 110° C. for 10 hours to obtain activated carbon nanotubes.

[0072] (2) Take 10 parts of tetrabutyl titanate and 50 parts of activated carbon nanotubes, mix them evenly, and then place the mixture in a humidity environment of 90% for 30 hours to generate titanium dioxide. After the mixture is taken out of the humidity environment, it is calcined in an ammonia atmosphere with a gas flow rate of 100 sccm, a calcination temperature of 200°C, and a calcination time of 10 hours to obtain a carbon nanotube / titanium dioxide composite, wherein the titanium dioxide is nitrogen-doped titanium dioxide after high-temperature calcination in an ammonia atmosphere.

[0073] (3) Take 5 parts of the carbon nanotube / titanium dioxide composite calcined at high temperature in step (2) and 100 parts of polystyrene to prepare a refrigerator liner to obtain a refrigerator liner.

[0074] Comparative Example 1

[0075] A method for preparing a refrigerator liner, wherein the steps are basically the same as those of Example 1, except that the mass of tetrabutyl titanate in step (2) is replaced by aluminum sol to obtain a carbon nanotube / aluminum oxide composite, and the mass of the carbon nanotube / titanium dioxide composite in step (3) is replaced by the carbon nanotube / aluminum oxide composite.

[0076] Comparative Example 2

[0077] A method for preparing a refrigerator liner, wherein the steps are basically the same as those of Example 1, except that the mass of carbon nanotubes in step (2) is replaced by amorphous carbon to obtain an amorphous carbon / titanium dioxide composite, and the mass of carbon nanotubes / titanium dioxide composite in step (3) is replaced by the amorphous carbon / titanium dioxide composite.

[0078] Comparative Example 3

[0079] A method for preparing a refrigerator liner, wherein the steps are basically the same as those of Example 1, except that the amount of tetrabutyl titanate in step (2) is increased to 20 parts, and the mass content of nitrogen-doped titanium dioxide in the obtained carbon nanotube / titanium dioxide composite is 8.58%.

[0080] Comparative Example 4

[0081] A method for preparing a refrigerator liner, wherein the steps are basically the same as those in Example 1, except that the only difference is step (3):

[0082] (3) Taking 10 parts of the carbon nanotube / titanium dioxide composite calcined at high temperature in step (2) and 100 parts of polystyrene, a refrigerator liner is prepared to obtain a refrigerator liner.

[0083] Test samples were prepared using the composites of step (3) in the above Examples 1 to 9 and Comparative Examples 1 to 4 and polystyrene as raw materials. The tensile strength of each test sample was tested according to GB / T1040-2006. The test values ​​are shown in Table 1 below.

[0084] The refrigerator liners prepared in the above Examples 1 to 9 and Comparative Examples 1 to 4 were sampled, and the antibacterial rates of Escherichia coli thereof were tested according to the method of GB 21551.2-2010. The test values ​​are shown in Table 1 below.

[0085] The refrigerator liners prepared in the above-mentioned Examples 1 to 9 and Comparative Examples 1 to 4 were installed in a 479 model refrigerator, the main structure of which was a double-door refrigerator. The refrigerator was packaged using a conventional method and stored at room temperature. When the refrigerator was packaged to the 7th day, a handheld TVOC detector was used to test the Total Volatile Organic Compounds (Total Volatile Organic Compounds) in the refrigerator with reference to the instrument usage method. Each refrigerator liners corresponded to 5 assembled refrigerators, and the average of the test values ​​corresponding to the 5 refrigerators was taken as the final test value of the refrigerator liners, as shown in Table 1 below.

[0086] Table 1

[0087]

[0088]

[0089] As can be seen from Table 1 above, in order to obtain the best mechanical properties for the refrigerator liner and to minimize the residual odor of the refrigerator before unpacking, carbon nanotubes and nitrogen-doped titanium dioxide play a key role.

[0090] It can be seen from Example 1 and Comparative Example 1 that conventional metal oxides cannot reduce the residual odor in the refrigerator before unpacking.

[0091] It can be seen from Example 1 and Comparative Example 2 that amorphous carbon cannot effectively absorb odor and cannot reduce the odor residue in the refrigerator before unpacking.

[0092] It can be seen from Example 1 and Comparative Example 3 that if a higher content of titanium dioxide precursor is added in step (2), more titanium dioxide will be distributed outside the carbon nanotubes in the resulting composite, thereby reducing the mechanical properties of the refrigerator liner.

[0093] It can be seen from Example 1 and Comparative Example 4 that when the carbon nanotube content is too high, the mechanical properties of the refrigerator liner are also reduced.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A deodorizing refrigerator liner, the refrigerator liner is made of a polystyrene composite material, characterized in that: The polystyrene composite material contains nitrogen-doped titanium dioxide in an amount of more than 0.02% by weight and carbon nanotubes in an amount of less than 4.55% by weight, and the nitrogen-doped titanium dioxide is mainly located inside the pores of the carbon nanotubes to remove odor components in the refrigerator.

2. The deodorizing refrigerator liner according to claim 1, characterized in that: The carbon nanotubes are acid-activated single-walled carbon nanotubes. Preferably, the particle size of the nitrogen-doped titanium dioxide is 5 to 10 nm.

3. The deodorizing refrigerator liner according to claim 1 or 2, characterized in that: The nitrogen-doped titanium dioxide is obtained by first generating titanium dioxide from a titanium dioxide precursor mainly located inside the pores of the carbon nanotubes and then calcining the titanium dioxide in a nitrogen-containing atmosphere.

4. The deodorizing refrigerator liner according to any one of claims 1 to 3, characterized in that: The titanium dioxide precursor is one or more of tetrabutyl titanate, isopropyl titanate and titanium tetrachloride.

5. The deodorizing refrigerator liner according to any one of claims 1 to 4, characterized in that: The polystyrene is one or more of ordinary polystyrene, expanded polystyrene, high impact polystyrene and syndiotactic polystyrene.

6. The method for preparing a deodorizing refrigerator liner according to any one of claims 1 to 5, characterized in that: include: Placing the carbon nanotubes in an acidic solvent to remove impurities in the carbon nanotubes and introduce active groups, and obtaining active carbon nanotubes after removing the solvent; The activated carbon nanotubes and the titanium dioxide precursor are mixed in a mass ratio of 100:(1-30) to obtain a mixture; The mixture is first placed in an environment with a humidity of 90-100 RH% to generate titanium dioxide, and then calcined in a nitrogen-containing atmosphere to obtain nitrogen-doped titanium dioxide mainly located inside the pores of the carbon nanotubes, which is recorded as a carbon nanotube / titanium dioxide composite; The carbon nanotube / titanium dioxide composite and polystyrene are used as raw materials to prepare an inner liner to obtain the refrigerator inner liner.

7. The method for preparing the deodorizing refrigerator liner according to claim 6, characterized in that: The mass ratio of the carbon nanotubes to the acidic solvent is (1-20):100, and the mixing time is 2-20 hours.

8. The method for preparing the deodorizing refrigerator liner according to claim 6 or 7, characterized in that: The time for generating titanium dioxide under the condition of environmental humidity of 90-100 RH% is 10-30 hours.

9. The method for preparing the deodorizing refrigerator liner according to claim 6, characterized in that: The nitrogen-containing atmosphere includes ammonia and / or nitrogen, and the gas flow rate is 1-100 sccm.

10. Use of the deodorizing refrigerator liner according to any one of claims 1 to 5.

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