Preparation method and application of high-performance, high-gloss and high-impact-resistance polystyrene

Abstract

The invention discloses a preparation method and application of high-performance, high-gloss and high-impact polystyrene, and the preparation method comprises the following steps: mixing and dissolving styrene, butadiene rubber, mineral oil, an antioxidant and a lubricant, preheating to 80-90 DEG C, adding into a double-kettle prepolymerization kettle for prepolymerization, the butadiene rubber comprises the following components in percentage by mass: 88%-92% of low cis-polybutadiene rubber and 8%-12% of butadiene styrene rubber; sequentially transferring the materials into a multi-stage reactor for polymerization, wherein the conversion rate reaches 70-80%; after the materials are preheated to 230-260 DEG C, the materials are subjected to two-stage devolatilization in a devolatilization device, and the vacuum degree of the devolatilization device is smaller than 3 kPaA; and finally, cooling the material in a water bath, and drying to obtain the high-performance, high-gloss and high-impact polystyrene. The polystyrene prepared by the invention can simultaneously have excellent glossiness and matt-grade impact resistance, and can meet various harsh requirements of shells of household appliances.

Description

Technical Field

[0001] The invention relates to the field of plastics, and in particular to a preparation method and application of high-performance, high-gloss and high-impact polystyrene. Background Art

[0002] Traditional polystyrene materials are mainly used for white appliance shells. They have high gloss, but generally low impact strength and cannot be compared with matte-grade polystyrene. Existing high-gloss HIPS mainly uses rubber formulation as the main technology and stirring speed before phase transition as the auxiliary technology. It introduces 0.6μm to 1.0μm small particle size rubber as the gloss enhancement peak, and 1.5μm to 3.0μm rubber particle size as the main mechanical peak, that is, a bimodal rubber particle size. However, this type of rubber particle size distribution will inevitably lead to a decrease in the impact performance of the material.

[0003] For example, the patent application with publication number CN110746544A discloses a high-gloss and high-impact polystyrene material and its preparation method. The material uses low-cis polybutadiene rubber and styrene as raw materials, and adopts a continuous bulk polymerization method to obtain a polystyrene with a bimodal particle size. The rubber bimodal particle size is 1.2μm to 4.4μm for the main peak of mechanical properties and 0.8μm to 1.0μm for the secondary peak of gloss properties. The glossiness at a 60-degree angle is 80% to 90%, and the cantilever beam notched impact strength is 10KJ / m 2 ~12KJ / m 2 However, when the glossiness at 60 degrees is ≥80%, the maximum Izod notched impact strength is only 11.6 KJ / m 2 , which is lower than the performance of matte grade HIPS (≥13KJ / m 2 ). In addition, the patent application only has the cantilever beam notch impact strength, while the current large white appliance manufacturers have more stringent requirements for the drop test of the shell after molding, and the drop hammer impact strength needs to be analyzed. However, the drop hammer impact strength of the mainstream high-gloss HIPS on the market is poor (≤30Lbs*inch), which is far weaker than the matte-grade HIPS (≥70Lbs*inch), and is basically not practical. Therefore, the patent application simply does not analyze the drop hammer impact performance.

[0004] It can be seen that the existing high-gloss high-impact polystyrene materials, while pursuing high gloss, are difficult to ensure that the materials have the impact performance of matte-grade high-impact polystyrene. This technical difficulty has been a difficulty that has not been overcome by first-class manufacturers in this field for a long time. Summary of the invention

[0005] The present invention provides a preparation method and application of high-performance high-gloss high-impact polystyrene, so as to solve the technical problem that the current high-gloss HIPS cannot take into account both high gloss and high impact performance.

[0006] In order to solve the above technical problems, in a first aspect, the present invention provides a method for preparing high-performance, high-gloss and high-impact polystyrene, comprising:

[0007] Step 1, styrene, butadiene rubber, mineral oil, antioxidant and lubricant are mixed and dissolved and preheated to 80°C to 90°C, and then added to a double-kettle prepolymerization kettle for prepolymerization, wherein the double-kettle prepolymerization kettle comprises a No. 0 prepolymerization kettle and a No. 1 prepolymerization kettle, wherein the temperature of the No. 0 prepolymerization kettle is 100°C to 115°C and the pressure is 25kPaA to 40kPaA, the temperature of the No. 1 prepolymerization kettle is 120°C to 130°C and the pressure is 50kPaA to 65kPaA, and the butadiene rubber comprises 88% to 92% of low-cis polybutadiene rubber and 8% to 12% of styrene-butadiene rubber by mass percentage;

[0008] Step 2, transferring the materials from step 1 into a multi-stage reactor in sequence for polymerization, so that the conversion rate reaches 70% to 80%;

[0009] Step 3, preheating the material in step 2 to 230°C to 260°C, and then performing two-stage devolatilization in a devolatilizer, wherein the vacuum degree of the devolatilizer is less than 3 kPaA;

[0010] Step 4: pelletize the material from step 3, cool it in a water bath, and then dry it to obtain high-performance, high-gloss, and high-impact polystyrene.

[0011] In some embodiments, the butadiene rubber comprises the following raw materials by mass percentage:

[0012] Low-cis polybutadiene rubber 80%, star-shaped low-cis polybutadiene rubber 10%, styrene-butadiene rubber 10%.

[0013] In some embodiments, the low-cis polybutadiene rubber includes a first low-cis polybutadiene rubber and a second low-cis polybutadiene rubber in a mass ratio of 1:3; the weight average molecular weight of the first low-cis polybutadiene rubber is 30W to 40W, and the weight average molecular weight of the second low-cis polybutadiene rubber is 40W to 60W.

[0014] In some of the embodiments, the weight average molecular weight of the star-shaped low-cis polybutadiene rubber is 30W-40W, and the weight average molecular weight of the styrene-butadiene rubber is 30W-40W.

[0015] In some embodiments, the high performance high gloss high impact polystyrene comprises the following raw materials in percentage by mass:

[0016] Styrene 88%-92%, butadiene rubber 7%-10%, mineral oil 1%-2.5%, antioxidant 0.1%-1%, lubricant 0-0.25%.

[0017] In some embodiments, the antioxidant includes one or more of antioxidant 264 , antioxidant 1010 , antioxidant 1076 , and antioxidant 2246 .

[0018] In some embodiments, the lubricant includes 0-0.15% zinc stearate and 0-0.1% ethylene bisstearamide.

[0019] In some embodiments, the multi-stage reactor includes reactor No. 2 with a temperature of 132°C to 142°C and a pressure of 20kPa to 30kPa, reactor No. 3 with a temperature of 140°C to 150°C and a pressure of 30kPa to 40kPa, reactor No. 4 with a temperature of 150°C to 160°C and a pressure of 40kPa to 50kPa, and reactor No. 5 with a temperature of 160°C to 170°C and a pressure of 50kPa to 60kPa, and reactor No. 2, reactor No. 3, reactor No. 4 and reactor No. 5 are connected in series in sequence.

[0020] Through the stepwise polymerization of the double-pot prepolymerization kettle, No. 2, No. 3, No. 4 and No. 5 reactors, the conversion rate of polystyrene reaches 70% to 80%, wherein the conversion rate of No. 0 prepolymerization kettle is 12% to 20%, the conversion rate of No. 1 prepolymerization kettle is 30% to 42%, the conversion rate of No. 2 reactor is 45% to 52%, the conversion rate of No. 3 reactor is 52% to 60%, the conversion rate of No. 4 reactor is 60% to 70%, and the conversion rate of No. 5 reactor is 70% to 80%.

[0021] In some embodiments, the step three comprises:

[0022] The material in step 2 is preheated to 240°C-258°C and then enters a primary devolatilizer for primary devolatilization, and then preheated to 246°C-260°C and then enters a secondary devolatilizer for secondary devolatilization, wherein the vacuum degrees of the primary devolatilizer and the secondary devolatilizer are both less than 3kPaA.

[0023] In a second aspect, the present invention further provides an application of polystyrene in household appliances, wherein the polystyrene is a high-performance, high-gloss, and high-impact polystyrene prepared based on the above preparation method.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] This application uses low-cis polybutadiene rubber and styrene butadiene rubber as rubber components, and uses a double-kettle prepolymerization kettle to better control reaction conditions such as temperature and pressure, thereby better controlling the molecular weight distribution, end group structure and grafting degree of the polymer; at the same time, a multi-stage reactor is used for polymerization to more accurately control the polymer conversion rate, and the unpolymerized material is separated through two-stage devolatilization to improve the polymer purity. The polystyrene prepared in this application can achieve a 60° gloss of 84% (high gloss requirement ≥ 80%) and a notched impact strength of 17.2KJ / m 2 (High light requirement ≥10KJ / m 2 ), drop hammer impact strength 100Lbs*inch (no requirement for high gloss, general manufacturers are <36), achieving excellent gloss and matte-level impact resistance, which can meet various stringent requirements for home appliance casings and truly achieve high performance, high gloss and high impact resistance of polystyrene. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purpose, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0027] As used herein, the term "prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0028] When amount, concentration or other value or parameter is expressed as range, preferred range or a series of upper preferred value and lower preferred value limit range, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value and any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when disclosing range "1 to 5", described range should be interpreted as including range "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5" etc. When numerical range is described in this article, unless otherwise stated, the range is intended to include its end value and all integers and fractions within the range.

[0029] In addition, the indefinite articles "a" and "an" before the elements or components of the present invention have no restrictions on the quantity requirements (i.e. the number of occurrences) of the elements or components. Therefore, "a" or "an" should be interpreted as including one or at least one, and the elements or components in the singular form also include the plural form, unless the number is obviously intended to be in the singular form.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] Example 1

[0032] Polystyrene includes the following raw materials in percentage by mass:

[0033] Styrene 87.85%, butadiene rubber 9.5%, mineral oil 2.4%, antioxidant 1076 0.1%, zinc stearate 0.05%, ethylene bis stearamide 0.1%;

[0034] Among them, butadiene rubber includes the following raw materials calculated by mass percentage:

[0035] 20% of low-cis polybutadiene rubber with a weight average molecular weight of 30W,

[0036] 60% of low-cis polybutadiene rubber with a weight average molecular weight of 40W,

[0037] 10% of star-shaped low-cis polybutadiene rubber with a weight average molecular weight of 30W,

[0038] 10% styrene-butadiene rubber with a weight average molecular weight of 30W;

[0039] A method for preparing high-performance, high-gloss and high-impact polystyrene, comprising:

[0040] Step 1: Mix and dissolve styrene, butadiene rubber, mineral oil, antioxidant and lubricant, preheat to 80°C, and add to a double-kettle prepolymerization kettle for prepolymerization, wherein the double-kettle prepolymerization kettle comprises a No. 0 prepolymerization kettle and a No. 1 prepolymerization kettle, wherein the temperature of the No. 0 prepolymerization kettle is 100°C and the pressure is 40 kPaA, and the temperature of the No. 1 prepolymerization kettle is 120°C and the pressure is 65 kPaA;

[0041] Step 2, transferring the materials of step 1 into multi-stage reactors in sequence for polymerization, so that the conversion rate reaches 75%; wherein the temperature of reactor No. 2 is 132° C. and the pressure is 30 kPa; the temperature of reactor No. 3 is 140° C. and the pressure is 40 kPa; the temperature of reactor No. 4 is 150° C. and the pressure is 50 kPa; and the temperature of reactor No. 5 is 160° C. and the pressure is 60 kPa;

[0042] Step 3, preheating the material of step 2 to 240°C and then entering the primary devolatilizer for primary devolatilization, and then preheating the material to 246°C and then entering the secondary devolatilizer for secondary devolatilization, wherein the vacuum degree of the primary devolatilizer and the vacuum degree of the secondary devolatilizer are both less than 3kPaA;

[0043] Step 4: pelletize the material from step 3, cool it in a water bath, and then dry it to obtain high-performance, high-gloss, and high-impact polystyrene.

[0044] Example 2

[0045] Polystyrene includes the following raw materials in percentage by mass:

[0046] Styrene 91.5%, butadiene rubber 7.1%, mineral oil 1%, antioxidant 1076 0.2%, zinc stearate 0.15%, ethylene bis stearamide 0.05%;

[0047] Among them, butadiene rubber includes the following raw materials calculated by mass percentage:

[0048] 20% of low-cis polybutadiene rubber with a weight average molecular weight of 40W,

[0049] 60% of low-cis polybutadiene rubber with a weight average molecular weight of 60W,

[0050] 10% of star-shaped low-cis polybutadiene rubber with a weight average molecular weight of 40W,

[0051] 10% styrene-butadiene rubber with a weight average molecular weight of 40W;

[0052] A method for preparing high-performance, high-gloss and high-impact polystyrene, comprising:

[0053] Step 1, mixing and dissolving styrene, butadiene rubber, mineral oil, antioxidant and lubricant, preheating to 90° C., and adding them to a double-kettle prepolymerization kettle for prepolymerization, wherein the double-kettle prepolymerization kettle comprises a No. 0 prepolymerization kettle and a No. 1 prepolymerization kettle, wherein the temperature of the No. 0 prepolymerization kettle is 115° C. and the pressure is 25 kPaA, and the temperature of the No. 1 prepolymerization kettle is 130° C. and the pressure is 50 kPaA;

[0054] Step 2, transferring the materials of step 1 into multi-stage reactors in sequence for polymerization, so that the conversion rate reaches 78%; wherein the temperature of reactor No. 2 is 142° C. and the pressure is 20 kPa; the temperature of reactor No. 3 is 150° C. and the pressure is 30 kPa; the temperature of reactor No. 4 is 160° C. and the pressure is 40 kPa; and the temperature of reactor No. 5 is 168° C. and the pressure is 50 kPa;

[0055] Step 3, preheating the material of step 2 to 258°C and then entering the primary devolatilizer for primary devolatilization, and then preheating the material to 260°C and then entering the secondary devolatilizer for secondary devolatilization, wherein the vacuum degree of the primary devolatilizer and the vacuum degree of the secondary devolatilizer are both less than 3kPaA;

[0056] Step 4: pelletize the material from step 3, cool it in a water bath, and then dry it to obtain high-performance, high-gloss, and high-impact polystyrene.

[0057] Example 3

[0058] Polystyrene includes the following raw materials in percentage by mass:

[0059] Styrene 89.8%, butadiene rubber 8.75%, mineral oil 1.2%, antioxidant 1076 0.1%, zinc stearate 0.05%, ethylene bis stearamide 0.1%;

[0060] Among them, butadiene rubber includes the following raw materials calculated by mass percentage:

[0061] 20% of low-cis polybutadiene rubber with a weight average molecular weight of 35W,

[0062] 60% of low-cis polybutadiene rubber with a weight average molecular weight of 50W,

[0063] 10% of star-shaped low-cis polybutadiene rubber with a weight average molecular weight of 35W,

[0064] 10% styrene-butadiene rubber with a weight average molecular weight of 35W;

[0065] A method for preparing high-performance, high-gloss and high-impact polystyrene, comprising:

[0066] Step 1, styrene, butadiene rubber, mineral oil, antioxidant and lubricant are mixed and dissolved and preheated to 85°C, and then added to a double-kettle prepolymerization kettle for prepolymerization, wherein the double-kettle prepolymerization kettle comprises a No. 0 prepolymerization kettle and a No. 1 prepolymerization kettle, wherein the temperature of the No. 0 prepolymerization kettle is 110°C and the pressure is 30 kPaA, and the temperature of the No. 1 prepolymerization kettle is 125°C and the pressure is 60 kPaA;

[0067] Step 2, transferring the materials of step 1 into multi-stage reactors in sequence for polymerization, so that the conversion rate reaches 75%; wherein the temperature of reactor No. 2 is 132° C. and the pressure is 20 kPa; the temperature of reactor No. 3 is 140° C. and the pressure is 30 kPa; the temperature of reactor No. 4 is 150° C. and the pressure is 40 kPa; and the temperature of reactor No. 5 is 160° C. and the pressure is 50 kPa;

[0068] Step 3, preheating the material of step 2 to 245°C and then entering the primary devolatilizer for primary devolatilization, and then preheating the material to 255°C and then entering the secondary devolatilizer for secondary devolatilization, wherein the vacuum degree of the primary devolatilizer and the vacuum degree of the secondary devolatilizer are both less than 3kPaA;

[0069] Step 4: pelletize the material from step 3, cool it in a water bath, and then dry it to obtain high-performance, high-gloss, and high-impact polystyrene.

[0070] Comparative Example 1

[0071] The difference from Example 1 is that the butadiene rubber of Comparative Example 1 includes the following raw materials, measured by mass percentage: 20% of low-cis polybutadiene rubber with a weight average molecular weight of 30W and 80% of low-cis polybutadiene rubber with a weight average molecular weight of 40W.

[0072] Comparative Example 2

[0073] The difference from Example 1 is that the butadiene rubber of Comparative Example 2 includes the following raw materials, measured by mass percentage: 20% of low-cis polybutadiene rubber with a weight average molecular weight of 30W, 40% of low-cis polybutadiene rubber with a weight average molecular weight of 40W, and 40% of star-shaped low-cis polybutadiene rubber with a weight average molecular weight of 30W.

[0074] Comparative Example 3

[0075] The difference from Example 1 is that the butadiene rubber of Comparative Example 3 includes the following raw materials, measured by mass percentage: 10% of low-cis polybutadiene rubber with a weight average molecular weight of 30W, 20% of low-cis polybutadiene rubber with a weight average molecular weight of 40W, and 70% of star-shaped low-cis polybutadiene rubber with a weight average molecular weight of 30W.

[0076] Comparative Example 4

[0077] The difference from Example 1 is that the butadiene rubber of Comparative Example 4 includes the following raw materials, measured by mass percentage: 20% of low-cis polybutadiene rubber with a weight average molecular weight of 30W, 60% of low-cis polybutadiene rubber with a weight average molecular weight of 40W, and 20% of star-shaped low-cis polybutadiene rubber with a weight average molecular weight of 30W.

[0078] Comparative Example 5

[0079] The difference from Example 1 is that the butadiene rubber of Comparative Example 5 includes the following raw materials, measured by mass percentage: 20% of low-cis polybutadiene rubber with a weight average molecular weight of 30W, 40% of low-cis polybutadiene rubber with a weight average molecular weight of 40W, 20% of star-shaped low-cis polybutadiene rubber with a weight average molecular weight of 30W, and 20% of styrene-butadiene rubber with a weight average molecular weight of 30W.

[0080] Comparative Example 6

[0081] The difference from Example 1 is that Comparative Example 6 adopts a single-pot prepolymerization kettle for prepolymerization, and the temperature of the single-pot prepolymerization kettle is 126° C. and the pressure is 65 kPaA.

[0082] Some raw material parameters and process parameters of the above embodiments and comparative examples are shown in Table 1 below:

[0083] Table 1 Partial raw material parameters and process parameters of each embodiment and comparative example

[0084]

[0085]

[0086] The 60° gloss, notched Izod impact strength and drop weight impact strength of the polystyrene prepared in the above-mentioned embodiments and comparative examples were tested. The test results are shown in Table 1.

[0087] Table 1 Glossiness and impact resistance of each embodiment and comparative example

[0088]

[0089] As shown in Table 2, the polystyrene prepared in Examples 1 and 3 of the present invention can achieve a 60° glossiness of 84-85% (high gloss requirement ≥ 80%) and a notched impact strength of 16.4-17.2 KJ / m 2 (High light requirement ≥10KJ / m 2 ), drop hammer impact strength 93-100Lbs*inch (no requirement for high gloss, generally manufacturers are <36), achieving excellent gloss and matte-level impact resistance, able to meet various stringent requirements for home appliance housings, truly achieving high performance, high gloss and high impact resistance of polystyrene. Example 2 has a gloss of 88% and a notched impact strength of 12.5KJ / m 2and drop weight impact strength 58Lbs*inch, the impact performance is not excellent, but it still meets the high gloss requirements; Comparative Example 1 is ordinary matte high-impact polystyrene, and its drop weight impact strength is excellent, but the gloss is not high; Comparative Examples 2 to 4 are polystyrene prepared without adding styrene-butadiene rubber and with a star-shaped low-cis butadiene rubber content of 40%, and its gloss is relatively good, and its notched impact strength is slightly lower than that of Example 1, but its drop weight impact strength is very poor; the cantilever notched impact strength and drop weight impact strength of Example 4 are not much different from those of Comparative Example 2, but its gloss is the best; although Comparative Example 5 adds 20% star-shaped low-cis butadiene rubber and 20% styrene-butadiene rubber, its gloss is better, and its notched impact strength is slightly lower than the qualified value, but its drop weight impact strength is still very poor.

[0090] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0091] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing high-performance, high-gloss, high-impact polystyrene, characterized in that: include: Step 1, styrene, butadiene rubber, mineral oil, antioxidant and lubricant are mixed and dissolved and preheated to 80°C to 90°C, and then added to a double-kettle prepolymerization kettle for prepolymerization, wherein the double-kettle prepolymerization kettle comprises a No. 0 prepolymerization kettle and a No. 1 prepolymerization kettle, wherein the temperature of the No. 0 prepolymerization kettle is 100°C to 115°C and the pressure is 25kPaA to 40kPaA, the temperature of the No. 1 prepolymerization kettle is 120°C to 130°C and the pressure is 50kPaA to 65kPaA, and the butadiene rubber comprises 88% to 92% of low-cis polybutadiene rubber and 8% to 12% of styrene-butadiene rubber by mass percentage; Step 2, transferring the materials from step 1 into a multi-stage reactor in sequence for polymerization, so that the conversion rate reaches 70% to 80%; Step 3, preheating the material in step 2 to 230°C to 260°C, and then performing two-stage devolatilization in a devolatilizer, wherein the vacuum degree of the devolatilizer is less than 3 kPaA; Step 4, cooling the material in step 3 in a water bath and then drying it to obtain high-performance, high-gloss, high-impact polystyrene.

2. The method for preparing high-performance, high-gloss, high-impact polystyrene according to claim 1, characterized in that: The butadiene rubber comprises the following raw materials in percentage by mass: Low-cis polybutadiene rubber 80%, star-shaped low-cis polybutadiene rubber 10%, styrene-butadiene rubber 10%.

3. The method for preparing high-performance, high-gloss, high-impact polystyrene according to claim 2, characterized in that: The low-cis polybutadiene rubber comprises a first low-cis polybutadiene rubber and a second low-cis polybutadiene rubber in a mass ratio of 1:3; the weight average molecular weight of the first low-cis polybutadiene rubber is 30W-40W, and the weight average molecular weight of the second low-cis polybutadiene rubber is 40W-60W.

4. The method for preparing high-performance, high-gloss, high-impact polystyrene according to claim 2 or 3, characterized in that: The weight average molecular weight of the star-shaped low-cis polybutadiene rubber is 30W-40W, and the weight average molecular weight of the styrene-butadiene rubber is 30W-40W.

5. The method for preparing high-performance, high-gloss, high-impact polystyrene according to claim 1, characterized in that: The high-performance, high-gloss, high-impact polystyrene comprises the following raw materials in percentage by mass: Styrene 87%-92%, butadiene rubber 7%-10%, mineral oil 1%-2.5%, antioxidant 0.1%-1%, lubricant 0-0.25%.

6. The method for preparing high-performance, high-gloss, high-impact polystyrene according to claim 1 or 5, characterized in that: The antioxidant includes one or more of antioxidant 264 , antioxidant 1010 , antioxidant 1076 , and antioxidant 2246 .

7. The method for preparing high-performance, high-gloss, high-impact polystyrene according to claim 1 or 5, characterized in that: The lubricant comprises 0-0.15% of zinc stearate and 0-0.1% of ethylene bisstearamide.

8. The method for preparing high-performance, high-gloss, high-impact polystyrene according to claim 1, characterized in that: The multi-stage reactor comprises a No. 2 reactor with a temperature of 132° C. to 142° C. and a pressure of 20 kPa to 30 kPa, a No. 3 reactor with a temperature of 140° C. to 150° C. and a pressure of 30 kPa to 40 kPa, a No. 4 reactor with a temperature of 150° C. to 160° C. and a pressure of 40 kPa to 50 kPa, and a No. 5 reactor with a temperature of 160° C. to 170° C. and a pressure of 50 kPa to 60 kPa. Reactor No. 2, reactor No. 3, reactor No. 4 and reactor No. 5 are connected in series in sequence.

9. The method for preparing high-performance, high-gloss, high-impact polystyrene according to claim 1, characterized in that: The step three comprises: The material in step 2 is preheated to 240°C-258°C and then enters a primary devolatilizer for primary devolatilization, and then preheated to 246°C-260°C and then enters a secondary devolatilizer for secondary devolatilization, wherein the vacuum degrees of the primary devolatilizer and the secondary devolatilizer are both less than 3kPaA.

10. Application of polystyrene in household appliances, characterized in that: The polystyrene is a high-performance, high-gloss, high-impact polystyrene prepared by the preparation method according to any one of claims 1 to 9.

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