CN117190567A - Refrigerator, refrigerator liner and preparation method of refrigerator liner - Google Patents

Abstract

The application provides a refrigerator, a refrigerator liner and a preparation method thereof, wherein the refrigerator liner comprises: toughening HIPS base layer and highlight HIPS surface layer; the first surface of the toughened HIPS base layer is combined with the high-gloss HIPS surface layer; the toughened HIPS base layer comprises 85-90% of extrusion-grade HIPS, 5-10% of SBC particles and 3-5% of color masterbatch; the high-gloss HIPS surface layer comprises 50-80% of high-gloss HIPS particles and 20-50% of SBC particles, the refrigerator liner manufactured by the toughened HIPS base layer and the high-gloss HIPS surface layer is high in glossiness, the glossiness attenuation after plastic suction is small, the obtained liner is high in glossiness, uniform in texture and free of peculiar smell.

Description

Refrigerator, refrigerator liner and preparation method of refrigerator liner

Technical Field

The application relates to the technical field of high polymer materials, in particular to a refrigerator, a refrigerator liner and a preparation method thereof.

Background

As the user's demand for the storage capacity of the refrigerator varies, the capacity of the refrigerator is gradually increased, and there is also a large-capacity refrigerator. The large-volume refrigerator has larger container size and higher toughness requirement on container materials, and needs to meet the technological requirement of plastic uptake and large stretching ratio.

Due to cost limitations, most refrigerator liners use extruded sheet-grade impact polystyrene (HIPS). The plastic uptake stretching ratio of the box liner of the side-by-side combination refrigerator or the box liner with a complex structure is relatively large. When the common HIPS is used on a box liner with larger stretching ratio, the box liner is easy to be in place due to insufficient stretching performance, or the thickness of the box liner is uneven, the plastic sucking process is poor, and the qualification ratio is low. Therefore, when the box liner with large stretching ratio is produced, the toughening HIPS color master batch is added to improve the toughness of HIPS, improve the plastic sucking stretching performance and improve the qualification rate of the box liner.

However, the main component of the toughening color master batch is rubber, the odor of rubber particles is large, the odor is easy to cause in the box body, and the high-gloss HIPS increases the glossiness of the box liner, but the toughness is poor, and the cracking probability of the liner is increased.

Disclosure of Invention

The application provides a refrigerator, a refrigerator liner and a preparation method thereof, which aim to solve the problem that the liner has peculiar smell.

The first aspect of the present application provides a refrigerator liner, comprising: toughening HIPS base layer and highlight HIPS surface layer;

the first surface of the toughened HIPS base layer is combined with the high-gloss HIPS surface layer;

the toughened HIPS base layer comprises 85-90% of extrusion-grade HIPS, 5-10% of SBC particles and 3-5% of color masterbatch;

the high gloss HIPS surface layer comprises 50-80% of high gloss HIPS particles and 20-50% of SBC particles.

Optionally, the high-gloss HIPS surface layer accounts for 2.5-4% of the thickness of the refrigerator liner.

Optionally, an alloy layer is also included, and the second surface of the toughened HIPS base layer is bonded to the alloy layer.

Optionally, the alloy layer comprises 30-35% PE, 40-50% PS and 13-16% conductive filler.

The refrigerator liner manufactured by the toughened HIPS base layer and the highlight HIPS surface layer has high glossiness, less glossiness attenuation after plastic suction, high glossiness of the obtained liner, uniformity and no peculiar smell, and the toughened HIPS base layer enables the liner to reduce the cracking probability.

The second aspect of the present application provides a method for preparing a refrigerator liner according to the first aspect, including:

placing 50-80% of highlight HIPS particles and 20-50% of SBC particles into a mixer for stirring and mixing to obtain a mixture;

adding 85-90% of extrusion-grade HIPS, 5-10% of SBC particles and 3-5% of color master into a main machine charging barrel of a co-extrusion plate machine for extrusion, and adding the mixture into a first auxiliary machine charging barrel of the co-extrusion plate machine for extrusion to obtain a multi-layer plate;

and (5) carrying out plastic suction molding on the multilayer plate to obtain the refrigerator liner.

Optionally, the method further comprises:

adding 30-35% PE, 40-50% PS and 13-16% conductive filler into a second auxiliary machine charging barrel, and extruding together with a main machine charging barrel and a first auxiliary machine charging barrel to obtain the multilayer board.

Optionally, the temperature interval of the main machine charging barrel screw is 180-220 ℃, the temperature interval of the first auxiliary machine charging barrel screw is 120-220 ℃, and the temperature interval of the second auxiliary machine charging barrel screw is 120-220 ℃.

Optionally, the method further comprises: and placing the multi-layer plate into a cooling roller for cooling and shaping, and cutting the cooled and shaped multi-layer plate to obtain the multi-layer plate for the refrigerator liner.

Optionally, the mixing time of the mixer is 15-20 minutes.

The third aspect of the application provides a refrigerator, which comprises a refrigerator body, a door body and the refrigerator liner of the first aspect.

According to the technical scheme, the application provides a refrigerator, a refrigerator liner and a preparation method thereof, wherein the refrigerator liner comprises the following steps: toughening HIPS base layer and highlight HIPS surface layer; the first surface of the toughened HIPS base layer is combined with the high-gloss HIPS surface layer; the toughened HIPS base layer comprises 85-90% of extrusion-grade HIPS, 5-10% of SBC particles and 3-5% of color masterbatch; the high-gloss HIPS surface layer comprises 50-80% of high-gloss HIPS particles and 20-50% of SBC particles, the refrigerator liner manufactured by the toughened HIPS base layer and the high-gloss HIPS surface layer is high in glossiness, the glossiness attenuation after plastic suction is small, the obtained liner is high in glossiness, uniform in texture and free of peculiar smell.

Drawings

In order to more clearly illustrate the technical solution of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a schematic flow chart of a method for manufacturing a refrigerator liner according to an embodiment;

FIG. 2 is a schematic view showing a refrigerator liner structure according to an embodiment;

fig. 3 is a schematic view illustrating a refrigerator liner structure according to another embodiment.

Illustration of:

wherein, the material comprises a 100-toughened HIPS base layer, a 200-high-gloss HIPS surface layer and a 300-alloy layer.

Detailed Description

Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the application. Merely exemplary of systems and methods consistent with aspects of the application as set forth in the claims.

In order to facilitate understanding of the technical solutions of the application, some concepts related to the present application will be described below first.

Extrusion grade HIPS refers to High Impact Polystyrene (HIPS) materials that can be commonly used to make extrusion molded plastic articles such as films, sheets, profiles, and the like.

The SBC particles are short for styrene-butadiene-styrene block copolymer, are particles of thermoplastic elastomer and extrusion-grade resin, and have high thermal stability.

The high-gloss HIPS particle is a polystyrene (HIPS) material with the characteristics of high gloss, high impact resistance, no toxicity, no smell, high transparency, high mechanical strength, easy processing and the like, is formed by copolymerizing styrene and butadiene, and is an amorphous polymer with an amorphous structure.

The PE/PS alloy is a blend of two plastics where PE is polyethylene and PS is polystyrene. The alloy is generally used for manufacturing plastic products and has the characteristics of wear resistance, corrosion resistance, insulation and the like.

When producing the box liner with large stretching ratio, a toughening HIPS color master batch is added to improve the toughness of HIPS, and the toughening color master batch mainly comprises rubber, for example: SBS rubber or SEBS rubber, the rubber particles smell greatly, cause the box gall smell to be great, in the exemplary, during the refrigerator of new production from leaving the factory to this warehousing and transportation time of user, the refrigerator door is airtight state, and the rubber smell that the box courage sent slowly enriches in the case, leads to the finished product to unpack the peculiar smell greatly.

In order to solve the above problems, referring to fig. 2, some embodiments of the present application provide a refrigerator liner, including: toughening HIPS base layer 100 and highlight HIPS top layer 200; a first surface of the toughened HIPS base layer 100 is bonded to the high gloss HIPS facing layer 200; the toughened HIPS base layer 100 comprises 85-90% extrusion grade HIPS, 5-10% SBC particles, and 3-5% color master; the high gloss HIPS facing 200 comprises 50-80% high gloss HIPS particles and 20-50% SBC particles.

The toughened HIPS base layer 100 of the present application comprises 85-90% extrusion grade HIPS, for example: 85%, 86%, 87%, 88%, 89%, 90% extrusion grade HIPS; the toughened HIPS base layer 100 of the present application comprises 5-10% SBC particles, for example: 5%, 6%, 7%, 8%, 9%, 10% SBC particles; the toughened HIPS base layer 100 of the present application comprises 3-5% color masterbatch, for example: 3%, 4%, 5% of color master; the high gloss HIPS surface layer 200 of the present application comprises 50-80% high gloss HIPS particles, such as: 50%, 60%, 70%, 80% of highlight HIPS particles; the highlight HIPS surface layer 200 of the present application comprises 20-50% SBC particles, such as: 20%, 30%, 40%, 50% of SBC particles.

For example, the highlight HIPS particles of highlight HIPS facing 200 were selected from model Cheng Xiao 1180, and the extrusion grade HIPS of toughened HIPS base layer 100 was selected from model Yingli benzene 8265 for the experiments.

In the using process of the refrigerator liner, in order to reduce the peculiar smell of the liner and obtain materials more suitable for the refrigerator liner, the materials are uniformly mixed according to the proportions shown in tables 1 and 2, and the refrigerator liner of the example 1 and the comparative example 1 is prepared for experiments.

TABLE 1

The highlight HIPS surface layer 200 formed in example 1 and comparative example 1 was combined with the toughened HIPS base layer 100 to prepare a refrigerator liner, which was defined as example 1 refrigerator liner and comparative example 1 refrigerator liner, and the example 1 refrigerator liner and comparative example 1 refrigerator liner were subjected to odor detection, and the different refrigerator liners obtained in example 1 refrigerator liner and comparative example 1 refrigerator liner were cut into small pieces as much as possible to have similar shapes and sizes. A proper amount of high-purity water is added into a test tube, and different multi-layer plates are put into the test tube and sealed. And placing the test tube into a controllable temperature box, and performing constant temperature treatment at a preset temperature. And processing at different temperatures according to the requirements, so as to ensure the controllability and consistency of the test conditions. After the constant temperature treatment is finished, the controllable temperature box is opened, the test tube is opened, and the smell emitted by the test tube is naturally diffused. And then using a special gas detector, placing an olfactory component of the detector at the positions of different multi-layer plates for emitting odor, and recording information such as detected odor types, intensity and quality. And the detection can be carried out for a plurality of times according to the requirement so as to obtain more reliable data results.

The odor qualification test is the environmental protection grade standard of the plate, and the environmental protection grade of the plate is divided into three standard grades of E0, E1 and E2. Wherein, the refrigerator liner of the embodiment 1 is E0 standard grade, and the refrigerator liner of the comparative embodiment 1 is E1 standard grade due to the addition of the toughening color master batch. Experimental results show that the refrigerator liner added with the toughening color master batch is more likely to generate peculiar smell.

The HIPS refrigerator liner has low surface glossiness, and a layer of high-gloss HIPS is added on the surface of the refrigerator liner plate in order to improve the glossiness of the refrigerator liner by using a coextrusion mode. The rubber particles used by the highlight HIPS have small particle size, poor toughness and poor oil corrosion resistance, and in order to reduce the risk of cracking of the liner, the thickness of the highlight HIPS surface layer 200 is generally very thin, and the thickness proportion is generally not more than 3%. In some embodiments, the high gloss HIPS surface layer 200 comprises 2.5-4% of the thickness of the refrigerator liner.

When the thickness ratio of the high-gloss HIPS surface layer 200 is 4%, the risk that the refrigerator liner is likely to crack is likely to be caused, and in order to reduce the risk, in some embodiments, the high-gloss HIPS surface layer 200 further includes a toughening agent, which can increase the toughness of the material, reduce the brittle polymer compound thereof, and have an obvious toughening effect, so that the cracking degree of the refrigerator liner can be reduced.

In some embodiments, the high gloss HIPS surface layer 200 of the present application includes 5-10% toughening agent, such as: 5%, 6%, 7%, 8%, 9%, 10% of a toughening agent. In some embodiments, the toughening agent is a combination of any one or more of ethylene propylene diene monomer EPDM, polyolefin elastomer POE, exemplary: the toughening agent is a combination of Ethylene Propylene Diene Monomer (EPDM) and polyolefin elastomer (POE), wherein the polyolefin elastomer (POE) is 6%, and the EPDM is 2%; again exemplary: the toughening agent is selected from any one of Ethylene Propylene Diene Monomer (EPDM) and polyolefin elastomer (POE), wherein 10% of EPDM or 10% of POE is selected and added.

In order to detect the effect of adding the toughening agent to different refrigerator liners, a cracking test can be utilized, and the cracking test can comprise two detection modes, wherein in the first mode, the refrigerator liners added with the toughening agent and the refrigerator liners without the toughening agent can be placed under a microscope with high magnification, and the shape, the size and the number of cracks of the refrigerator liners added with the toughening agent and the refrigerator liners without the toughening agent are smaller, the number of the cracks of the refrigerator liners added with the toughening agent is smaller, and the number of the cracks of the refrigerator liners without the toughening agent is larger, and the number of the refrigerator liners without the toughening agent is more.

In order to make the experimental result more accurate, another way is provided to carry out cracking detection on the refrigerator inner containers added with the toughening agent and the refrigerator inner containers without the toughening agent, and a stress cracking tester is utilized to detect the refrigerator inner containers added with the toughening agent and the refrigerator inner containers without the toughening agent, wherein the detection result is that the refrigerator inner containers without the toughening agent are easier to crack than the refrigerator inner containers added with the toughening agent, and the cracking time of the refrigerator inner containers without the toughening agent is earlier than that of the refrigerator inner containers added with the toughening agent.

Referring to FIG. 3, in some embodiments, an alloy layer 300 is also included, and a second surface of the toughened HIPS base layer 100 is bonded to the alloy layer 300. The toughened HIPS base layer 100 is disposed between the high gloss HIPS face layer 200 and the alloy layer 300.

To increase the corrosion resistance of the alloy, in some embodiments, the alloy layer 300 includes 30-35% PE (Polyethylene), 40-50% PS (Polystyrene Polystyrene), and 13-16% conductive filler.

The alloy layer 300 of the present application comprises 30-35% polyethylene, for example: 30%, 31%, 32%, 33%, 34%, 35% polyethylene; the alloy layer 300 of the present application comprises 40-50% polystyrene, for example: 40%, 45%, 50% SBC polystyrene; the alloy layer 300 of the present application includes 13-16% conductive filler, such as: 13%, 14%, 15%, 16% of SBC conductive filler.

The conductive filler can be silver powder, carbon black powder or conductive fibers such as carbon fibers, contains a large amount of OH active groups, and rapidly reacts with active components in the filler and active surfaces of steel or other materials to generate an inorganic polymer with a three-dimensional structure, and the coating and a matrix are connected into a whole to form a heat-resistant anti-corrosion coating with electrochemical protection and physical shielding effects, so that the conductive filler is particularly suitable for long-acting protection of steel or other material structures working in high-temperature and corrosive environments.

In some embodiments, the alloy layer 300 may also be selected from ABS (Acrylonitrile Butadiene Styrene Copolymer acrylonitrile, butadiene, styrene three monomer polymer), which also has corrosion resistance. In order to increase the corrosion resistance of the refrigerator liner, stabilizers, antioxidants and the like can be added to further improve the corrosion resistance of the refrigerator liner, so that the service life of the refrigerator liner is longer.

The refrigerator liners of examples 2-7 and comparative example 2 were prepared by uniformly mixing the respective materials according to the ratios shown in table 2 to perform experiments.

TABLE 2

Referring to table 1, example 2 is the lowest percentage of each material, example 7 is the highest percentage of each material, and comparative example 2 is the percentage beyond the highest percentage provided in this example.

In order to uniformly mix the materials with different parts by weight in embodiments 2 to 7, based on the refrigerator liner described above, referring to fig. 1, some embodiments of the present application provide a method for preparing a refrigerator liner, including:

s100: 50-80% of highlight HIPS particles and 20-50% of SBC particles are placed in a mixer to be stirred and mixed, and a mixture is obtained.

In some embodiments, the temperature of the mixer is 60-80℃and the mixing time of the mixer is 15-20 minutes. Illustratively, different percentages of HIPS-1180 particles and SBC particles of examples 2-7 and comparative example 2 were mixed, wherein the mixers used in examples 2-7 and comparative example 2 were the same mixer, the temperature of the mixer was selected to be 60℃and the mixing time was selected to be 15 minutes in order to reduce the temperature of the mixer and the mixing time, the effect of temperature on the mixture.

S200: 85-90% of extrusion grade HIPS, 5-10% of SBC particles and 3-5% of color master are added into a main machine charging barrel of a co-extrusion plate machine for extrusion, and the mixture is added into a first auxiliary machine charging barrel of the co-extrusion plate machine for extrusion, so that a multi-layer plate material is obtained.

The co-extrusion plate extruder can simultaneously melt and mix two or more thermoplastic plastics through a plurality of extruders, then extrude the melted materials into a die belt, fuse the materials of each layer, and form a product with two or more layers of materials outside the die belt. The co-extrusion plate extruder is composed of two or more extruders, a machine head, a die belt, a cooling system, a traction system and the like, and can extrude plastics with different colors or different performances at the same time. In this example, the toughened HIPS facing was co-fed with the mixture into a co-extrusion plate extruder.

In some embodiments, the temperature range of the main machine barrel screw is 180-220 ℃ and the temperature range of the first auxiliary machine barrel screw is 120-220 ℃.

Illustratively, different percentages of HIPS-8265 particles, SBC particles, and color master of examples 2-7 and comparative example 2 were mixed, wherein the mixers used in examples 2-7 and comparative example 2 were the same coextrusion plate machine, the temperature of the main barrel screw was selected to be 190℃and the temperature of the first auxiliary barrel screw was selected to be 180℃in order to reduce the effects of the temperature of the main barrel screw and the temperature of the first auxiliary barrel screw.

In some embodiments, further comprising: and (3) putting the multi-layer plate into a cooling roller for cooling and shaping, and cutting the cooled and shaped multi-layer plate to obtain the multi-layer plate for the refrigerator liner.

In some embodiments, the multi-layer sheet is cooled and dried, and the multi-layer sheet may be cooled by water or air cooling.

The different multi-layered sheets obtained in examples 2 to 7 and comparative example 2 were air-cooled to obtain different multi-layered sheets, and the multi-layered sheets in examples 2 to 7 and comparative example 2 were subjected to odor test and cracking test,

the odor qualification test is to test whether the multilayer board has bad odor, and firstly cut the different multilayer boards obtained in examples 2-7 and comparative example 2 into small pieces so as to have similar shapes and sizes as much as possible. A proper amount of high-purity water is added into a test tube, and different multi-layer plates are put into the test tube and sealed. And placing the test tube into a controllable temperature box, and performing constant temperature treatment at a preset temperature. And processing at different temperatures according to the requirements, so as to ensure the controllability and consistency of the test conditions. After the constant temperature treatment is finished, the controllable temperature box is opened, the test tube is opened, and the smell emitted by the test tube is naturally diffused. And then using a special gas detector, placing an olfactory component of the detector at the positions of different multi-layer plates for emitting odor, and recording information such as detected odor types, intensity and quality. And the detection can be carried out for a plurality of times according to the requirement so as to obtain more reliable data results.

In Table 3, the odor qualification test is the environmental protection grade standard of the plate, and the environmental protection grade of the plate is classified into three standard grades of E0, E1 and E2.

The following table shows the results of the odor intensity test in examples 2-7;

TABLE 3 Table 3

Examples	Odor intensity test
		Example 2	E0
Example 3	E0
		Example 4	E0
Example 5	E0
		Example 6	E0
Example 7	E0
		Comparative example 2	E1

S300: and (5) carrying out plastic suction molding on the multi-layer plate to obtain the refrigerator liner.

Firstly, cutting and trimming the multi-layer plate according to the requirements, placing the cut multi-layer plate on heating equipment to be heated so as to soften the multi-layer plate, placing the heated and softened multi-layer plate on a die, adsorbing the multi-layer plate on the die through the action of vacuum negative pressure to form a required shape, shearing the multi-layer plate adsorbed on the die according to the requirements of a refrigerator liner, punching the sheared multi-layer plate according to the thickness requirements of the refrigerator liner so as to achieve the required thickness, and finally shearing and punching the multi-layer plate to obtain the refrigerator liner.

To bond the alloy layer 300 to the high gloss HIPS facing 200 and the toughened HIPS base layer 100, in some embodiments, it further comprises: adding 30-35% PE, 40-50% PS and 13-16% conductive filler into a second auxiliary machine charging barrel, and extruding together with a main machine charging barrel and a first auxiliary machine charging barrel to obtain the multilayer board.

Since adding the alloy layer 300 cannot be accomplished by a two-layer coextrusion extruder, three-layer coextrusion, which is a process of extruding three different materials on the same extruder through a coextrusion die once, can be utilized after adding the alloy layer 300. The alloy layer 300 is co-extruded with the high gloss HIPS facing layer 200 and the toughened HIPS base layer 100 to obtain a multi-layer sheet.

In some embodiments, the temperature range of the second auxiliary barrel screw is 120-220 ℃.

The obtained multi-layer plate is cooled and dried, the multi-layer plate can be cooled by water or air, and then the cooled and dried multi-layer plate is subjected to plastic suction molding according to different refrigerator liner shapes required by different refrigerators, so that the refrigerator liner is obtained.

Based on the refrigerator liner, some embodiments of the application provide a refrigerator, which comprises a refrigerator body, a door body and a refrigerator liner.

According to the technical scheme, the application provides a refrigerator, a refrigerator liner and a preparation method thereof, wherein the refrigerator liner comprises the following steps: toughening HIPS base layer 100 and highlight HIPS top layer 200; a first surface of the toughened HIPS base layer 100 is bonded to the high gloss HIPS facing layer 200; the toughened HIPS base layer 100 comprises 85-90% extrusion grade HIPS, 5-10% SBC particles, and 3-5% color master; the high gloss HIPS surface layer 200 comprises 50-80% of high gloss HIPS particles and 20-50% of SBC particles, and the refrigerator liner prepared by toughening the HIPS base layer 100 and the high gloss HIPS surface layer 200 has high glossiness, less glossiness attenuation after plastic suction, high glossiness of the obtained liner, uniform texture and no peculiar smell.

The above-provided detailed description is merely a few examples under the general inventive concept and does not limit the scope of the present application. Any other embodiments which are extended according to the solution of the application without inventive effort fall within the scope of protection of the application for a person skilled in the art.

Claims (10)

1. A refrigerator liner, comprising: a toughened HIPS base layer (100) and a high gloss HIPS top layer (200);

a first surface of the toughened HIPS base layer (100) is bonded to the high gloss HIPS face layer (200);

the toughened HIPS base layer (100) comprises 85-90% extrusion-grade HIPS, 5-10% SBC particles and 3-5% color master;

the high gloss HIPS facing (200) comprises 50-80% high gloss HIPS particles and 20-50% SBC particles.

2. The refrigerator liner according to claim 1, wherein the high gloss HIPS finish (200) comprises a thickness ratio of 2.5-4% of the refrigerator liner.

3. The refrigerator liner of claim 1, further comprising an alloy layer (300), wherein the second surface of the toughened HIPS base layer (100) is bonded to the alloy layer (300).

4. A refrigerator liner according to claim 3, wherein the alloy layer (300) comprises 30-35% pe, 40-50% ps and 13-16% conductive filler.

5. A method for preparing a refrigerator liner according to any one of claims 1 to 4, comprising:

placing 50-80% of highlight HIPS particles and 20-50% of SBC particles into a mixer for stirring and mixing to obtain a mixture;

adding 85-90% of extrusion-grade HIPS, 5-10% of SBC particles and 3-5% of color master into a main machine charging barrel of a co-extrusion plate machine for extrusion, and adding the mixture into a first auxiliary machine charging barrel of the co-extrusion plate machine for extrusion to obtain a multi-layer plate;

and (5) carrying out plastic suction molding on the multilayer plate to obtain the refrigerator liner.

6. The method for manufacturing a refrigerator liner according to claim 5, further comprising:

adding 30-35% PE, 40-50% PS and 13-16% conductive filler into a second auxiliary machine charging barrel, and extruding together with a main machine charging barrel and the first auxiliary machine charging barrel to obtain the multilayer board.

7. The method for manufacturing a refrigerator liner according to claim 6, wherein the temperature range of the main machine cylinder screw is 180-220 ℃, the temperature range of the first auxiliary machine cylinder screw is 120-220 ℃, and the temperature range of the second auxiliary machine cylinder screw is 120-220 ℃.

8. The method for manufacturing a refrigerator liner according to claim 6, further comprising: and placing the multi-layer plate into a cooling roller for cooling and shaping, and cutting the cooled and shaped multi-layer plate to obtain the multi-layer plate for the refrigerator liner.

9. The method of claim 5, wherein the mixing time of the mixer is 15-20 minutes.

10. A refrigerator comprising a cabinet, a door, and a refrigerator liner according to any one of claims 1-4.