Flame-retardant and impact-resistant polystyrene material for packaging and preparation method thereof

Abstract

The present invention relates to the technical field of polymer materials, and proposes a flame retardant and impact-resistant polystyrene material for packaging and a preparation method thereof. The flame retardant and impact-resistant polystyrene material for packaging comprises the following components in parts by weight: 100 parts of polystyrene, 12 to 26 parts of styrene-acrylonitrile copolymer, 8 to 15 parts of ethylene-vinyl acetate copolymer, 3 to 10 parts of styrene-butadiene-styrene block copolymer, 2 to 8 parts of hydrogenated styrene-butadiene-styrene block copolymer, 1 to 10 parts of dimethylbenzene ketone, 5 to 10 parts of potassium titanate whiskers, 30 to 40 parts of flame retardant, 2 to 6 parts of antioxidant, and 1 to 2 parts of antistatic agent. Through the above technical scheme, the problems of poor tensile properties and poor impact resistance of polystyrene materials in the related art are solved.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a flame-retardant and impact-resistant polystyrene material for packaging and a preparation method thereof. Background Art

[0002] Polystyrene is a colorless and transparent thermoplastic, which is made from styrene monomers through free radical addition polymerization. It has good physical properties, excellent electrical properties, good flame retardancy, and excellent chemical stability. In addition, polystyrene has excellent fluidity, is easy to color, and has good dimensional stability. This material can be made into a variety of parts through various processing methods such as injection molding, extrusion, blow molding, foaming, thermoforming, bonding, coating, welding, machining, printing, etc.

[0003] Due to its excellent processing properties, polystyrene has been widely used in packaging materials, household appliances, building materials, medical devices and other fields. Especially in the field of packaging materials, polystyrene materials are widely used to protect fragile items such as electronic products, toys, furniture, etc., and are also used for food and beverage packaging.

[0004] However, polystyrene materials also have some performance defects. As a type of thermoplastic, polystyrene is a typical hard and brittle material with relatively poor impact resistance. It is easy to crack or break when subjected to external impact. At the same time, the tensile properties of polystyrene materials need to be improved. Although the improved polystyrene materials have certain tensile properties, they still cannot meet the needs of long-term use, which limits their application to a certain extent.

[0005] Therefore, developing a polystyrene material that has both good tensile properties and excellent impact resistance is of great significance for further expanding its application in packaging materials and other fields. Summary of the invention

[0006] The invention provides a flame retardant and impact resistant polystyrene material for packaging and a preparation method thereof, which solves the problems of poor tensile properties and poor impact resistance of the polystyrene material in the related art.

[0007] The technical solution of the present invention is as follows: The present invention provides a flame retardant and impact resistant polystyrene material for packaging, comprising the following components in parts by weight: 100 parts of polystyrene, 12-26 parts of styrene-acrylonitrile copolymer, 8-15 parts of ethylene-vinyl acetate copolymer, 3-10 parts of styrene-butadiene-styrene block copolymer, 2-8 parts of hydrogenated styrene-butadiene-styrene block copolymer, 1-10 parts of dimethyl phenyl ketone, 5-10 parts of potassium titanate whiskers, 30-40 parts of flame retardant, 2-6 parts of antioxidant, and 1-2 parts of antistatic agent.

[0008] As a further technical solution, the weight ratio of the styrene-acrylonitrile copolymer to dimethyl styrene ketone is 3-7:1.

[0009] When the weight ratio of styrene-acrylonitrile copolymer to dimethyl styrene ketone is 3 to 7:1, the tensile properties of the polystyrene material can be further improved.

[0010] As a further technical solution, the polystyrene includes a first polystyrene and a second polystyrene, and the first polystyrene and the second polystyrene have different melting indexes; the melting index of the first polystyrene is 3.8~5.5g / 10min, and the melting index of the second polystyrene is 6.0~9.0g / 10min.

[0011] In the present invention, when the polystyrene includes the first polystyrene and the second polystyrene, the internal structure of the polystyrene can be improved by compounding the two polystyrenes with different melt indexes, thereby improving the stability of the polystyrene material and further improving the tensile properties and impact resistance of the polystyrene material.

[0012] As a further technical solution, the weight of the first polystyrene is greater than the weight of the second polystyrene.

[0013] By reasonably adjusting the weight relationship between the first polystyrene and the second polystyrene, when the weight of the first polystyrene is greater than the weight of the second polystyrene, the tensile properties and impact resistance of the polystyrene material can be further improved.

[0014] As a further technical solution, the potassium titanate whisker is a modified potassium titanate whisker, and the raw materials of the modified potassium titanate whisker include potassium titanate whisker and a modifier.

[0015] As a further technical solution, the modifier includes polyvinyl cinnamate and yttrium oxide in a weight ratio of 3:2.

[0016] In the present invention, when the modifiers are polyvinyl cinnamate and yttrium oxide, the potassium titanate whiskers are modified by polyvinyl cinnamate and yttrium oxide together, so that the potassium titanate whiskers can be better dispersed in the polystyrene substrate, so as to better interact with the substrate and other components, thereby forming a dense and stable polystyrene material, thereby further improving the impact resistance of the polystyrene material.

[0017] As a further technical solution, the weight ratio of the potassium titanate whiskers to the modifier is 50:5~8.

[0018] When the weight ratio of potassium titanate whiskers to modifier is 50:5~8, the impact resistance of polystyrene materials can be further improved.

[0019] As a further technical solution, the preparation method of the modified potassium titanate whisker comprises the following steps: A1, mixing the yttrium oxide and the potassium titanate whiskers uniformly to obtain a mixture; A2, adding the mixture to a solution of anilinemethyltriethoxysilane, stirring, and drying to obtain a treated mixture; A3, dissolving the polyvinyl cinnamate in ethyl acetate, adding the treated mixture, dispersing evenly, and drying to obtain the modified potassium titanate whiskers.

[0020] As a further technical solution, the particle size of the yttrium oxide is 50-100 nm; the diameter of the potassium titanate whisker is 0.2-10 μm, and the length is 4-50 μm.

[0021] As a further technical solution, the anilinemethyltriethoxysilane solution is an ethanol solution of anilinemethyltriethoxysilane with a mass fraction of 15% to 20%.

[0022] As a further technical solution, the weight ratio of the potassium titanate whiskers to the anilinemethyltriethoxysilane solution is 1:1.2.

[0023] As a further technical solution, the flame retardant is one or both of triphenyl phosphate and bromotriazine.

[0024] As a further technical solution, the antioxidant is one or more of antioxidant 697, antioxidant 1010, and antioxidant 245.

[0025] As a further technical solution, the antistatic agent is one or both of polyoxyethylene stearate and polyoxyethylene sorbitan monostearate.

[0026] The addition of antistatic agent can reduce the surface resistance of polystyrene material, making it difficult for static electricity to accumulate on its surface, thus achieving the effect of surface antistatic.

[0027] The present invention also provides a method for preparing the flame retardant and impact resistant polystyrene material for packaging, comprising the following steps: S1, mixing the polystyrene, styrene-acrylonitrile copolymer, ethylene-vinyl acetate copolymer, styrene-butadiene-styrene block copolymer, hydrogenated styrene-butadiene-styrene block copolymer and dimethyl phenyl ketone uniformly, kneading to obtain a mixture; S2, adding the potassium titanate whisker, flame retardant, antioxidant and antistatic agent into the mixture, kneading, and extruding to obtain the polystyrene material.

[0028] As a further technical solution, in step S1, during the mixing, the temperature is 145-165°C and the time is 0.5-1.5h; in step S2, during the extrusion, the temperature is 145-165°C.

[0029] The working principle and beneficial effects of the present invention are: In the present invention, the polystyrene material is based on polystyrene, combined with styrene-acrylonitrile copolymer, ethylene-vinyl acetate copolymer, styrene-butadiene-styrene block copolymer, hydrogenated styrene-butadiene-styrene block copolymer, dimethyl styrene ketone, potassium titanate whisker and flame retardant, antioxidant and antistatic agent, and can be prepared to form a polystyrene material with good flame retardancy, while the addition of styrene-butadiene-styrene block copolymer and hydrogenated styrene-butadiene-styrene block copolymer makes the polystyrene material have good toughness, and cooperates with the remaining components, so that the polystyrene material finally presents good impact resistance. Wherein, the polystyrene material includes styrene-acrylonitrile copolymer and dimethyl styrene ketone, and there is interaction between styrene-acrylonitrile copolymer and dimethyl styrene ketone. By using the two together, the effect with the polystyrene substrate can be strengthened, thereby forming a stable internal network structure, and significantly improving the tensile properties of the polystyrene material. In addition, the addition of potassium titanate whiskers can significantly improve the impact resistance of the polystyrene material. DETAILED DESCRIPTION

[0030] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0031] In the following embodiments and comparative examples, when the melt index of the first polystyrene is 5.5g / 10min, the model is PH-60; when the melt index of the first polystyrene is 3.8g / 10min, the model is PH-888H; when the melt index of the second polystyrene is 9.0g / 10min, the model is PH-55Y; when the melt index of the second polystyrene is 6.0g / 10min, the model is PH-88; the model of styrene-acrylonitrile copolymer is NF2200AR; the model of ethylene-vinyl acetate copolymer is EVA 18J3; the model of styrene-butadiene-styrene block copolymer is YH-791; the model of hydrogenated styrene-butadiene-styrene block copolymer is SEBS 6150; the model of polyoxyethylene stearate is Brij 72; the average diameter of potassium titanate whiskers is 8μm and the length is 30μm; the average particle size of yttrium oxide is 80nm; the model of polyvinyl cinnamate is S27915.

[0032] Example 1 A flame retardant and impact-resistant polystyrene material for packaging, comprising the following components in parts by weight: 100 parts of polystyrene, 12 parts of styrene-acrylonitrile copolymer, 8 parts of ethylene-vinyl acetate copolymer, 3 parts of styrene-butadiene-styrene block copolymer, 2 parts of hydrogenated styrene-butadiene-styrene block copolymer, 1 part of dimethyl phenyl ketone, 5 parts of potassium titanate whisker, 30 parts of triphenyl phosphate, 2 parts of antioxidant 697, 1 part of polyoxyethylene stearate; The polystyrene is the first polystyrene (melt index 5.5 g / 10 min); The preparation method thereof comprises the following steps: S1, mixing the above-mentioned polystyrene, styrene-acrylonitrile copolymer, ethylene-vinyl acetate copolymer, styrene-butadiene-styrene block copolymer, hydrogenated styrene-butadiene-styrene block copolymer and dimethyl phenyl ketone uniformly, and kneading at 145° C. for 1.5 h to obtain a mixture; S2, adding potassium titanate whiskers, triphenyl phosphate, antioxidant 697 and polyoxyethylene stearate into the mixture, kneading, and extruding to obtain a polystyrene material; During extrusion, the extrusion temperature of zone 1 is 145°C, the extrusion temperature of zone 2 is 165°C, and the extrusion temperature of zone 3 is 155°C.

[0033] Example 2 A flame retardant and impact-resistant polystyrene material for packaging, comprising the following components in parts by weight: 100 parts of polystyrene, 16 parts of styrene-acrylonitrile copolymer, 11 parts of ethylene-vinyl acetate copolymer, 6 parts of styrene-butadiene-styrene block copolymer, 5 parts of hydrogenated styrene-butadiene-styrene block copolymer, 8 parts of dimethyl phenyl ketone, 8 parts of potassium titanate whisker, 35 parts of bromotriazine, 4 parts of antioxidant 1010, 1.5 parts of polyoxyethylene stearate; The polystyrene is the first polystyrene (melt index 5.5 g / 10 min); The preparation method thereof comprises the following steps: S1, mixing the above-mentioned polystyrene, styrene-acrylonitrile copolymer, ethylene-vinyl acetate copolymer, styrene-butadiene-styrene block copolymer, hydrogenated styrene-butadiene-styrene block copolymer and dimethyl phenyl ketone uniformly, and kneading at 155° C. for 1 hour to obtain a mixture; S2, adding potassium titanate whiskers, bromotriazine, antioxidant 1010 and polyoxyethylene stearate into the mixture, kneading, and extruding to obtain a polystyrene material; During extrusion, the extrusion temperature of zone 1 is 145°C, the extrusion temperature of zone 2 is 165°C, and the extrusion temperature of zone 3 is 155°C.

[0034] Example 3 A flame retardant and impact-resistant polystyrene material for packaging, comprising the following components in parts by weight: 100 parts of polystyrene, 26 parts of styrene-acrylonitrile copolymer, 15 parts of ethylene-vinyl acetate copolymer, 10 parts of styrene-butadiene-styrene block copolymer, 8 parts of hydrogenated styrene-butadiene-styrene block copolymer, 10 parts of dimethyl phenyl ketone, 10 parts of potassium titanate whisker, 40 parts of bromotriazine, 6 parts of antioxidant 1010, 2 parts of polyoxyethylene stearate; The polystyrene is the first polystyrene (melt index 5.5 g / 10 min); The preparation method thereof comprises the following steps: S1, mixing the above-mentioned polystyrene, styrene-acrylonitrile copolymer, ethylene-vinyl acetate copolymer, styrene-butadiene-styrene block copolymer, hydrogenated styrene-butadiene-styrene block copolymer and dimethyl phenyl ketone uniformly, and kneading at 165° C. for 0.5 h to obtain a mixture; S2, adding potassium titanate whiskers, bromotriazine, antioxidant 1010 and polyoxyethylene stearate into the mixture, kneading, and extruding to obtain a polystyrene material; During extrusion, the extrusion temperature of zone 1 is 145°C, the extrusion temperature of zone 2 is 165°C, and the extrusion temperature of zone 3 is 155°C.

[0035] Example 4 The only difference between this embodiment and embodiment 2 is that in this embodiment, 23 parts of styrene-acrylonitrile copolymer and 1 part of dimethyl phenyl ketone are added.

[0036] Example 5 The only difference between this embodiment and embodiment 2 is that in this embodiment, 18 parts of styrene-acrylonitrile copolymer and 6 parts of dimethyl styrene ketone are added.

[0037] Example 6 The difference between this embodiment and embodiment 2 is that, in this embodiment, 21 parts of styrene-acrylonitrile copolymer and 3 parts of dimethyl phenyl ketone are added.

[0038] Example 7 The only difference between this embodiment and embodiment 6 is that, in this embodiment, 100 parts of the first polystyrene (melt index 5.5 g / 10 min) are replaced by an equal amount of the second polystyrene (melt index 9.0 g / 10 min).

[0039] Example 8 The only difference between this embodiment and embodiment 6 is that, in this embodiment, 100 parts of the first polystyrene (melt index 5.5 g / 10 min) are replaced by 50 parts of the first polystyrene (melt index 5.5 g / 10 min) and 50 parts of the second polystyrene (melt index 9.0 g / 10 min).

[0040] Example 9 The only difference between this embodiment and embodiment 6 is that, in this embodiment, 100 parts of the first polystyrene (melt index 5.5 g / 10 min) are replaced by 40 parts of the first polystyrene (melt index 5.5 g / 10 min) and 60 parts of the second polystyrene (melt index 9.0 g / 10 min).

[0041] Example 10 The only difference between this embodiment and embodiment 6 is that, in this embodiment, 100 parts of the first polystyrene (melt index 5.5 g / 10 min) are replaced by 60 parts of the first polystyrene (melt index 5.5 g / 10 min) and 40 parts of the second polystyrene (melt index 9.0 g / 10 min).

[0042] Embodiment 11 The only difference between this embodiment and embodiment 6 is that, in this embodiment, 100 parts of the first polystyrene (melt index 5.5 g / 10 min) are replaced by 60 parts of the first polystyrene (melt index 3.8 g / 10 min) and 40 parts of the second polystyrene (melt index 6.0 g / 10 min).

[0043] Example 12 The difference between this embodiment and embodiment 10 is that, in this embodiment, the potassium titanate whisker is a modified potassium titanate whisker, and the preparation method thereof comprises the following steps: A1. Add 50 parts of potassium titanate whiskers to 60 parts of 18% by mass aniline methyl triethoxysilane solution, stir, and dry to obtain treated potassium titanate whiskers; A2. Dissolve 3 parts of polyvinyl cinnamate in 60 parts of ethyl acetate, add the treated potassium titanate whiskers, disperse evenly, and dry to obtain modified potassium titanate whiskers.

[0044] Example 13 The only difference between this embodiment and embodiment 10 is that in this embodiment, the potassium titanate whiskers are modified potassium titanate whiskers, and the preparation method thereof comprises the following steps: 3 parts of yttrium oxide and 50 parts of potassium titanate whiskers are uniformly mixed to obtain modified potassium titanate whiskers.

[0045] Embodiment 14 The difference between this embodiment and embodiment 13 is that, in this embodiment, the potassium titanate whisker is a modified potassium titanate whisker, and the preparation method thereof comprises the following steps: A1. 1.2 parts of yttrium oxide and 50 parts of potassium titanate whiskers are mixed uniformly to obtain a mixture; A2, adding the mixture into 60 parts of anilinemethyltriethoxysilane solution, stirring, and drying to obtain a treated mixture; A3. Dissolve 1.8 parts of polyvinyl cinnamate in 60 parts of ethyl acetate, add the treated mixture, disperse evenly, and dry to obtain modified potassium titanate whiskers.

[0046] Embodiment 15 The only difference between this embodiment and embodiment 14 is that in this embodiment, during the process of preparing modified potassium titanate whiskers, 4 parts of yttrium oxide and 6 parts of polyvinyl cinnamate are added.

[0047] Example 16 The only difference between this embodiment and embodiment 14 is that in this embodiment, during the preparation of modified potassium titanate whiskers, 2 parts of yttrium oxide and 3 parts of polyvinyl cinnamate were added.

[0048] Embodiment 17 The only difference between this embodiment and embodiment 14 is that in this embodiment, during the preparation of modified potassium titanate whiskers, 3.2 parts of yttrium oxide and 4.8 parts of polyvinyl cinnamate were added.

[0049] Comparative Example 1 The difference between this comparative example and Example 1 is that in this comparative example, no dimethyl phenyl ketone is added, and 13 parts of styrene-acrylonitrile copolymer are added.

[0050] Comparative Example 2 The difference between this comparative example and Example 1 is that in this comparative example, no styrene-acrylonitrile copolymer is added, and 13 parts of dimethyl phenyl ketone are added.

[0051] Comparative Example 3 The only difference between this comparative example and Example 1 is that in this comparative example, neither styrene-acrylonitrile copolymer nor dimethyl styrene ketone is added.

[0052] Comparative Example 4 The only difference between this comparative example and Example 1 is that in this comparative example, potassium titanate whiskers are not added.

[0053] Experimental Example 1 Flame retardant performance test The polystyrene materials prepared in Examples 1 to 3 were subjected to oxygen index determination according to the test method in GB / T 2406.2-2009 "Determination of Combustion Behavior of Plastics by Oxygen Index Method Part 2: Room Temperature Test", wherein the method adopted in the test is Method A (top surface ignition method), the sample is a Type I sample with a size of 100 mm×10 mm×4 mm, and the test results are the average values ​​of the three samples. The test results are shown in Table 1 below.

[0054] Table 1 Flame retardant performance test results of Examples 1 to 3

[0055] It can be seen from Table 1 that the oxygen index of Examples 1 to 3 is greater than 30.0%, indicating that the polystyrene material prepared in this scheme has good flame retardant properties.

[0056] Experimental Example 2 Tensile Properties Test The polystyrene materials prepared in Examples 1 to 11 and Comparative Examples 1 to 3 were tested for tensile strength according to the test method in GB / T 1040.1-2018 "Determination of Tensile Properties of Plastics Part 1: General Principles", wherein the specimen was a 1A dumbbell-shaped specimen, the test speed was 100 mm / min, and the test result was the average value of 5 specimens, with the result retaining 2 decimal places. The test results are shown in Table 2 below.

[0057] Table 2 Tensile performance test results of Examples 1 to 11 and Comparative Examples 1 to 3

[0058] It can be seen from Table 2 that compared with Comparative Examples 1 to 3, the tensile strength of Example 1 is significantly improved, indicating that when styrene-acrylonitrile copolymer and dimethyl styrene ketone are introduced into the polystyrene material, the styrene-acrylonitrile copolymer and dimethyl styrene ketone have a synergistic effect and can significantly improve the tensile properties of the polystyrene material.

[0059] Compared with Examples 2 and 4, the tensile strength of Examples 5-6 is improved, indicating that when the weight ratio of styrene-acrylonitrile copolymer to dimethyl styrene ketone is 3-7:1, the tensile properties of the polystyrene material can be further improved.

[0060] Compared with Examples 6 to 7, the tensile strength of Examples 8 to 11 is improved, indicating that when the polystyrene includes the first polystyrene and the second polystyrene, the tensile properties of the polystyrene material can be further improved by compounding two polystyrenes with different melt indexes.

[0061] Compared with Examples 8 to 9, the tensile strength of Examples 10 to 11 is improved, indicating that when the weight of the first polystyrene is greater than the weight of the second polystyrene, the tensile properties of the polystyrene material can be further improved.

[0062] Experimental Example 3 Impact resistance test The polystyrene materials prepared in Example 1, Examples 6 to 17 and Comparative Example 4 were tested for simple beam unnotched impact strength at 23°C, 50°C and -40°C according to the test method in GB / T 1043.1-2008 "Determination of impact properties of simple beams of plastics Part 1: Non-instrumented impact test", wherein the specimen is a type 1 specimen with a size of 80 mm×10 mm×4 mm, and the test result is the average value of 10 specimens, and the result is rounded to one decimal place. The test results are shown in Table 3 below: Table 3 Impact resistance test results of Example 1, Examples 6 to 17 and Comparative Example 4

[0063] It can be seen from Table 3 that compared with Comparative Example 4, the simply supported beam unnotched impact strength at 23°C, 50°C and -40°C in Example 1 is significantly improved, indicating that the addition of potassium titanate whiskers in the polystyrene material can significantly improve the impact resistance of the polystyrene material.

[0064] Compared with Examples 6 to 7, the simply supported beam unnotched impact strength at 23°C, 50°C, and -40°C in Examples 8 to 11 is improved, indicating that when the polystyrene includes a first polystyrene and a second polystyrene, the impact resistance of the polystyrene material can be further improved by compounding two polystyrenes with different melt indexes.

[0065] Compared with Examples 8 to 9, the simply supported beam unnotched impact strength at 23°C, 50°C, and -40°C in Examples 10 to 11 is improved, indicating that when the weight of the first polystyrene is greater than the weight of the second polystyrene, the impact resistance of the polystyrene material can be further improved.

[0066] Compared with Example 10, the simply supported beam unnotched impact strength at 23°C, 50°C, and -40°C in Examples 12 to 17 is improved, indicating that the impact resistance of the polystyrene material can be further improved when the potassium titanate whiskers are modified by a modifier.

[0067] Compared with Examples 12 to 13, the unnotched impact strength of simply supported beams at 23°C, 50°C, and -40°C in Examples 14 to 17 is improved, indicating that when the modifiers are polyvinyl cinnamate and yttrium oxide, the potassium titanate whiskers are modified by using polyvinyl cinnamate and yttrium oxide together, and the impact resistance of the polystyrene material can be further improved.

[0068] Compared with Examples 14 to 15, the simply supported beam unnotched impact strength at 23°C, 50°C, and -40°C in Examples 16 to 17 is improved, indicating that when the weight ratio of potassium titanate whiskers to modifier is 50:5 to 8, the impact resistance of the polystyrene material can be further improved.

[0069] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flame retardant and impact resistant polystyrene material for packaging, characterized in that: The composition comprises the following components in parts by weight: 100 parts of polystyrene, 12-26 parts of styrene-acrylonitrile copolymer, 8-15 parts of ethylene-vinyl acetate copolymer, 3-10 parts of styrene-butadiene-styrene block copolymer, 2-8 parts of hydrogenated styrene-butadiene-styrene block copolymer, 1-10 parts of dimethyl phenyl ketone, 5-10 parts of potassium titanate whiskers, 30-40 parts of flame retardant, 2-6 parts of antioxidant, and 1-2 parts of antistatic agent.

2. The flame retardant and impact resistant polystyrene material for packaging according to claim 1, characterized in that: The weight ratio of the styrene-acrylonitrile copolymer to dimethyl styrene ketone is 3-7:

1.

3. The flame retardant and impact resistant polystyrene material for packaging according to claim 1, characterized in that: The polystyrene comprises a first polystyrene and a second polystyrene, and the first polystyrene and the second polystyrene have different melting indexes; the melting index of the first polystyrene is 3.8-5.5 g / 10 min, and the melting index of the second polystyrene is 6.0-9.0 g / 10 min.

4. The flame retardant and impact resistant polystyrene material for packaging according to claim 3, characterized in that: The weight portion of the first polystyrene is greater than the weight portion of the second polystyrene.

5. The flame retardant and impact resistant polystyrene material for packaging according to claim 1, characterized in that: The potassium titanate whisker is a modified potassium titanate whisker, and the raw materials of the modified potassium titanate whisker include potassium titanate whisker and a modifier; the modifier includes polyvinyl cinnamate and yttrium oxide in a weight ratio of 3:

2.

6. The flame retardant and impact resistant polystyrene material for packaging according to claim 5, characterized in that: The weight ratio of the potassium titanate whisker to the modifier is 50:5-8.

7. The flame retardant and impact resistant polystyrene material for packaging according to claim 5, characterized in that: The preparation method of the modified potassium titanate whisker comprises the following steps: A1, mixing the yttrium oxide and the potassium titanate whiskers uniformly to obtain a mixture; A2, adding the mixture to a solution of anilinemethyltriethoxysilane, stirring, and drying to obtain a treated mixture; A3, dissolving the polyvinyl cinnamate in ethyl acetate, adding the treated mixture, dispersing evenly, and drying to obtain the modified potassium titanate whiskers.

8. The flame retardant and impact resistant polystyrene material for packaging according to claim 7, characterized in that: The aniline methyl triethoxysilane solution is an ethanol solution of aniline methyl triethoxysilane with a mass fraction of 15% to 20%; The weight ratio of the potassium titanate whisker to the anilinemethyltriethoxysilane solution is 1:1.

2.

9. The flame retardant and impact resistant polystyrene material for packaging according to claim 1, characterized in that: The flame retardant is one or two of triphenyl phosphate and bromotriazine; the antioxidant is one or more of antioxidant 697, antioxidant 1010, and antioxidant 245; the antistatic agent is one or two of polyoxyethylene stearate and polyoxyethylene sorbitan monostearate.

10. The method for preparing a flame retardant and impact resistant polystyrene material for packaging according to claim 1, characterized in that: The following steps are involved: S1, mixing the polystyrene, styrene-acrylonitrile copolymer, ethylene-vinyl acetate copolymer, styrene-butadiene-styrene block copolymer, hydrogenated styrene-butadiene-styrene block copolymer and dimethyl phenyl ketone uniformly, kneading to obtain a mixture; S2, adding the potassium titanate whisker, flame retardant, antioxidant and antistatic agent into the mixture, kneading, and extruding to obtain the polystyrene material.

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