CN113308061A - Creep-resistant regenerated PS material and preparation process thereof - Google Patents
Creep-resistant regenerated PS material and preparation process thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/06—Polystyrene
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The application relates to the field of recycled plastics, and particularly discloses a creep-resistant recycled PS material and a preparation process thereof. A creep-resistant regenerated PS material is prepared from the following raw materials in percentage by weight: 30-40% of creep-resistant HIPS, 10-15% of high impact HIPS, 2.5-3.5% of thermoplastic styrene-butadiene rubber, 0-0.3% of antioxidant and the balance of PS reclaimed material; the preparation process comprises the following steps: and uniformly mixing the PS reclaimed material, the creep-resistant HIPS, the high-impact HIPS, the thermoplastic styrene butadiene rubber and the antioxidant, mixing, extruding and granulating to obtain the creep-resistant regenerated PS material. The creep-resistant regenerated PS material not only can improve the utilization rate of the foamed polystyrene waste material, but also can prolong the service life of the regenerated PS material.
Description
Technical Field
The application relates to the field of recycled plastics, in particular to a creep-resistant recycled PS material and a preparation process thereof.
Background
PS refers to a polymer synthesized by styrene monomer through free radical addition polymerization, and is a colorless and transparent thermoplastic plastic, including common polystyrene, expanded polystyrene, high impact polystyrene, syndiotactic polystyrene and the like.
Among them, expanded polystyrene, also known as expandable polystyrene, has the advantages of small relative density, impact vibration resistance, heat insulation and the like, and is widely used as a shockproof packaging material for mechanical equipment, instruments and meters, household electrical appliances, artware and other easily damaged valuable products.
With the rapid development of global economy, the amount of waste foamed polystyrene plastic is increasing day by day. The waste expanded polystyrene plastic has the characteristics of light weight and large volume, has the characteristics of aging resistance, difficult corrosion and the like, and becomes a great problem in garbage disposal. In recent years, recycling of expanded polystyrene has become one of the most important issues in the industry.
However, it is found that the regenerated PS material is more easily deformed when the amount of the waste expanded polystyrene is larger in the recycling process of the expanded polystyrene, so that the service life of the regenerated PS material is shorter.
Disclosure of Invention
In order to improve the utilization rate of the expanded polystyrene waste material as much as possible and prolong the service life of the regenerated PS material, the application provides the creep-resistant regenerated PS material and the preparation process thereof.
In a first aspect, the present application provides a creep-resistant recycled PS material, which adopts the following technical solution:
a creep-resistant regenerated PS material is prepared from the following raw materials in percentage by weight:
creep resistant HIPS: 30 to 40 percent of
High impact HIPS: 10 to 15 percent of
Thermoplastic styrene-butadiene rubber: 2.5 to 3.5 percent
Antioxidant: 0 to 0.3 percent
PS renewable material: balance of
The creep resistant HIPS has a tensile strength of 26-32N/mm2 and a tensile modulus of elasticity of 1850-1950N/mm 2.
By adopting the technical scheme, when 41.2-57.5% of PS reclaimed material is doped into the creep-resistant regenerated PS material, the creep-resistant regenerated PS material with the tensile creep modulus of more than 1000MPa can be obtained under the combined action of the PS reclaimed material, the creep-resistant HIPS, the high impact HIPS and the thermoplastic styrene butadiene rubber, and the service life of the regenerated PS material is prolonged.
Preferably, the high impact HIPS has an impact strength of 9.5 to 15 kg.cm/cm.
By adopting the technical scheme, when the impact strength range of the high impact HIPS is 9.5-15kg.cm/cm, the impact strength of the creep-resistant regenerated PS material obtained by mixing and smelting the PS reclaimed material, the creep-resistant HIPS, the high impact HIPS and the thermoplastic styrene butadiene rubber is greater than 8kg.cm/cm, the tensile creep modulus is greater than 1200MPa, and the service life of the regenerated PS material is further prolonged.
Preferably, the content of the styrene in the thermoplastic styrene-butadiene rubber ranges from 30% to 32%.
By adopting the technical scheme, when the content range of styrene in the thermoplastic styrene-butadiene rubber is 30-32%, the tensile creep modulus of the creep-resistant regenerated PS material obtained by mixing and smelting the PS reclaimed material, the creep-resistant HIPS, the high-impact HIPS and the thermoplastic styrene-butadiene rubber is further increased, so that the creep resistance of the creep-resistant regenerated PS material is favorably improved, and the service life of the regenerated PS material is prolonged.
Preferably, the antioxidant is one or a combination of two of an antioxidant 1076 and an antioxidant 168.
By adopting the technical scheme, the addition of the antioxidant can improve the weather resistance of the creep-resistant regenerated PS material, and is beneficial to prolonging the service life of the creep-resistant regenerated PS material.
Preferably, the preparation method of the PS reclaimed material comprises the following steps:
preparing a PS pretreatment material: compressing and deflating the foamed PS waste material to obtain a PS pretreatment material;
preparing a PS reclaimed material: and (3) melting, extruding and granulating the PS pretreatment material to obtain the PS reclaimed material.
By adopting the technical scheme, the foaming PS waste material is compressed and deflated firstly, and then the PS recycled material is prepared, so that the volume of the foaming PS waste material can be reduced, and the improvement of the processing performance of the foaming PS waste material is facilitated.
Preferably, in the preparation process of the PS regeneration material, sodium bicarbonate, azobisisobutyronitrile and maleimide compounds are further added into the PS pretreatment material, wherein the weight ratio of the PS pretreatment material to the sodium bicarbonate to the azobisisobutyronitrile to the maleimide compounds is 100: (8-12): (0.5-2.0): (0.04-0.08).
By adopting the technical scheme, the PS pretreatment material is modified by adopting sodium bicarbonate, azodiisobutyronitrile and maleimide compounds in a certain ratio to obtain the PS reclaimed material, and the PS reclaimed material is matched with creep-resistant HIPS, high-impact HIPS and thermoplastic styrene butadiene rubber to obtain a creep-resistant regenerated PS material with good impact strength, tensile strength and tensile creep modulus, so that the service life of the regenerated PS material is further prolonged.
Preferably, the maleimide compound is any one or a combination of more of maleimide, N-4, 4-diphenylmethane bismaleimide and N, N-m-phenylene bismaleimide.
By adopting the technical scheme, maleimide, N-4, 4-diphenylmethane bismaleimide or N, N-m-phenylene bismaleimide can be used for modifying the PS pretreatment material together with sodium bicarbonate and azodiisobutyronitrile to obtain the PS recycled material which is beneficial to improving the performance of the creep-resistant recycled PS material.
Preferably, in the preparation process of the PS reclaimed material, calcium stearate is further added into the PS pretreatment material, and the weight ratio of the azobisisobutyronitrile to the calcium stearate is 1: (2-3).
By adopting the technical scheme, the PS reclaimed material is prepared under the combined action of the PS pretreatment material, sodium bicarbonate, azodiisobutyronitrile, calcium stearate and maleimide compounds, and when the creep-resistant regenerated PS material is prepared by mixing and smelting the PS reclaimed material, creep-resistant HIPS, high impact HIPS and thermoplastic styrene butadiene rubber, the tensile creep modulus of the obtained creep-resistant regenerated PS material is further increased, and meanwhile, the flowability of the creep-resistant regenerated PS material is improved, so that the processability of the creep-resistant regenerated PS material is improved.
In a second aspect, the present application provides a preparation process of a creep-resistant recycled PS material, which adopts the following technical scheme:
a preparation process of a creep-resistant regenerated PS material comprises the steps of uniformly mixing a PS regenerated material, creep-resistant HIPS, high-impact HIPS, thermoplastic styrene butadiene rubber and an antioxidant, mixing, extruding and granulating to obtain the creep-resistant regenerated PS material.
By adopting the technical scheme, the creep-resistant regenerated PS material prepared by the method has better creep resistance, and is beneficial to prolonging the service life of the regenerated PS material.
Preferably, the mixing and extruding process is carried out in an extruder, the rotating speed of a screw in the extruder is 580-600rpm, the extruder is divided into 8 zones, and the set temperature of each zone is as follows:
zone 1: 195-215 ℃, zone 2: 195-215 ℃, zone 3: 200 ℃ and 220 ℃,4 region: 200 ℃ and 220 ℃, 5 region: 205-: 205-: 210 ℃ 230 ℃, 8 zone: 210 ℃ and 230 ℃; the temperature of the extruder head was 215-.
By adopting the technical scheme, all raw materials can be completely melted and uniformly mixed, so that the performance difference of the creep-resistant regenerated PS material at each position is reduced.
In summary, the present application has the following beneficial effects:
1. when 41.2-57.5% of PS reclaimed material is doped into the creep-resistant regenerated PS material, the creep-resistant regenerated PS material with the tensile creep modulus of more than 1000MPa can be obtained under the combined action of the PS reclaimed material, the creep-resistant HIPS, the high impact HIPS and the thermoplastic styrene butadiene rubber, and the service life of the regenerated PS material is prolonged.
2. When the impact strength range of the high impact HIPS is 9.5-15kg.cm/cm, the impact strength of the creep-resistant regenerated PS material obtained by mixing and smelting the PS reclaimed material, the creep-resistant HIPS, the high impact HIPS and the thermoplastic styrene butadiene rubber is greater than 8kg.cm/cm, and the tensile creep modulus is greater than 1200MPa, so that the service life of the regenerated PS material is further prolonged.
3. When the content of the styrene in the thermoplastic styrene-butadiene rubber is 30-32%, the tensile creep modulus of the creep-resistant regenerated PS material obtained by mixing and smelting the PS reclaimed material, the creep-resistant HIPS, the high-impact HIPS and the thermoplastic styrene-butadiene rubber is further increased, so that the creep resistance of the creep-resistant regenerated PS material is improved, and the service life of the regenerated PS material is prolonged.
Detailed Description
The present application will be described in further detail with reference to examples and comparative examples.
Examples
Example 1
A creep-resistant regenerated PS material is prepared by the following process:
s1, preparing a PS regenerated material:
s1.1, preparing a PS pretreatment material: compressing and deflating the foamed PS waste material to obtain a PS pretreatment material;
s1.2, preparing a PS reclaimed material: and (3) melting, extruding and granulating the PS pretreatment material to obtain the PS reclaimed material.
S2, preparing the creep-resistant regenerated PS material:
525kg of PS regrind and 300kg of tensile strength of 26N/mm2Tensile modulus of elasticity of 1850N/mm2After uniformly mixing the creep-resistant HIPS, 150kg of high-impact HIPS with the impact strength of 7kg. cm/cm and 25kg of thermoplastic styrene-butadiene rubber with the styrene content of 25%, feeding the mixture into an extruder for mixing and extruding, and finally granulating by a granulator to obtain the creep-resistant regenerated PS material; wherein, the rotational speed of screw rod is 580rpm in the extruder, and the extruder is equipped with 8 temperature setting districts, 1 district: 195 ℃ 205 ℃, 2 zone: 195 ℃ C., 205 ℃, zone 3: 200 ℃ and 210 ℃,4 region: 200 ℃ and 210 ℃, 5 region: 205-: 205-: 210 ℃ 220 ℃, 8 zone: 210-220 ℃ and the temperature of the extruder head is 215-225 ℃.
Example 2
A creep-resistant regenerated PS material is prepared by the following process:
s1, preparing a PS regenerated material:
s1.1, preparing a PS pretreatment material: compressing and deflating the foamed PS waste material to obtain a PS pretreatment material;
s1.2, preparing a PS reclaimed material: and (3) melting, extruding and granulating the PS pretreatment material to obtain the PS reclaimed material.
S2, preparing the creep-resistant regenerated PS material:
495kgPS reclaimed material and 350kg of tensile strength of 29N/mm2Tensile modulus of elasticity of 1900N/mm2After being uniformly mixed, 125kg of creep-resistant HIPS, high-impact HIPS with the impact strength of 7kg. cm/cm and 30kg of thermoplastic styrene-butadiene rubber with the styrene content of 25 percent are fed into an extruder for mixing and extrusion, and finally, the creep-resistant regenerated PS material is obtained by granulating through a granulator; wherein, the rotational speed of screw rod is 590rpm in the extruder, and the extruder is equipped with 8 temperature setting districts, 1 district: 205-215 ℃, zone 2: 205-215 ℃, zone 3: 210 ℃ 220 ℃, zone 4: 210 ℃ 220 ℃, 5 zone: 215-: 215-: 220 ℃ 230 ℃, zone 8: 220 ℃ and 230 ℃, and the temperature of the extruder head is 225 ℃ and 235 ℃.
Example 3
A creep-resistant regenerated PS material is prepared by the following process:
s1, preparing a PS regenerated material:
s1.1, preparing a PS pretreatment material: compressing and deflating the foamed PS waste material to obtain a PS pretreatment material;
s1.2, preparing a PS reclaimed material: and (3) melting, extruding and granulating the PS pretreatment material to obtain the PS reclaimed material.
S2, preparing the creep-resistant regenerated PS material:
465kg of PS reclaimed material and 400kg of tensile strength of 32N/mm2Tensile modulus of elasticity of 1950N/mm2The creep-resistant HIPS, 100kg of high impact HIPS with the impact strength of 7kg.cm/cm and 35kg of thermoplastic styrene-butadiene rubber with the styrene content of 40 percent are uniformly mixed, then are sent into an extruder for mixing and extrusion, and finally are granulated by a granulator to obtain the creep-resistant regenerated PS material; wherein, the rotational speed of screw rod is 600rpm in the extruder, and the extruder is equipped with 8 temperature setting districts, 1 district: 205-215 ℃, zone 2: 205-215 ℃, zone 3: 210 ℃ 220 ℃, zone 4: 210 ℃ 220 ℃, 5 zone: 215-: 215-: 220 ℃ 230 ℃, zone 8: 220 ℃ and 230 ℃, and the temperature of the extruder head is 225 ℃ and 235 ℃.
Example 4
A creep-resistant recycled PS material, which differs from example 3 in that:
high impact HIPS having an impact strength of 7kg.cm/cm was replaced with an equivalent amount of high impact HIPS having an impact strength of 9.5 kg.cm/cm.
Example 5
A creep-resistant recycled PS material, which differs from example 3 in that:
high impact HIPS having an impact strength of 7kg.cm/cm was replaced with an equivalent amount of high impact HIPS having an impact strength of 15 kg.cm/cm.
Example 6
A creep-resistant recycled PS material, which differs from example 3 in that:
high impact HIPS having an impact strength of 7kg.cm/cm was replaced with an equivalent amount of high impact HIPS having an impact strength of 25 kg.cm/cm.
Example 7
A creep-resistant recycled PS material, which differs from example 3 in that:
the thermoplastic styrene-butadiene rubber with the styrene content of 40 percent is replaced by the same amount of thermoplastic styrene-butadiene rubber with the styrene content of 30 percent.
Example 8
A creep-resistant recycled PS material, which differs from example 3 in that:
the thermoplastic styrene-butadiene rubber with the styrene content of 40 percent is replaced by the same amount of thermoplastic styrene-butadiene rubber with the styrene content of 32 percent.
Example 9
A creep-resistant recycled PS material, which differs from example 3 in that:
s1.2, preparing a PS reclaimed material:
after uniformly mixing 1000kg of PS pretreatment material, 80kg of sodium bicarbonate, 20kg of azobisisobutyronitrile and 0.4kg of N, N-4, 4-diphenylmethane bismaleimide, carrying out melt extrusion granulation to obtain the PS regeneration material.
Example 10
A creep-resistant recycled PS material, which differs from example 3 in that:
s1.2, preparing a PS reclaimed material:
after uniformly mixing 1000kg of PS pretreatment material, 120kg of sodium bicarbonate, 5kg of azobisisobutyronitrile and 0.8kg of N, N-m-phenylene bismaleimide, carrying out melt extrusion granulation to obtain the PS reclaimed material.
Example 11
A creep-resistant recycled PS material, which differs from example 10 in that:
s1.2, preparing a PS reclaimed material:
after uniformly mixing 1000kg of PS pretreatment material, 120kg of sodium bicarbonate, 5kg of azobisisobutyronitrile, 10kg of calcium stearate and 0.8kg of N, N-m-phenylene bismaleimide, carrying out melt extrusion granulation to obtain the PS reclaimed material.
Example 12
A creep-resistant recycled PS material, which differs from example 10 in that:
s1.2, preparing a PS reclaimed material:
after uniformly mixing 1000kg of PS pretreatment material, 120kg of sodium bicarbonate, 5kg of azobisisobutyronitrile, 15kg of calcium stearate and 0.8kg of N, N-m-phenylene bismaleimide, carrying out melt extrusion granulation to obtain the PS reclaimed material.
Example 13
A creep-resistant recycled PS material, which differs from example 12 in that:
3kg of antioxidant 1076 was also added in the step S2, and the addition amount of PS regrind was adjusted to 462 kg.
Comparative example
Comparative example 1
A recycled PS material, differing from example 3 in that:
creep resistant HIPS was replaced with an equivalent amount of expanded polystyrene.
Comparative example 2
A recycled PS material, differing from example 3 in that:
high impact HIPS was replaced with an equivalent amount of expanded polystyrene.
Comparative example 3
A recycled PS material, differing from example 3 in that:
the thermoplastic styrene-butadiene rubber is replaced by polybutadiene rubber with the same quantity.
Comparative example 4
A recycled PS material, differing from example 3 in that:
creep resistant HIPS, high impact HIPS and thermoplastic styrene butadiene rubber are respectively replaced by the same amount of PS reclaimed materials.
Detection method
Melt flow index: the determination is carried out with reference to ISO-1133 determination of the melt mass flow rate MFR and melt volume flow rate MVR of the thermoplastics.
Impact strength: the measurement was carried out with reference to ISO-179-1-2010 "measurement of pendulum impact Properties of plastics".
Tensile strength: the determination is carried out with reference to ISO-527-1-2012 "determination of tensile Properties of plastics".
Tensile creep modulus: the determination is carried out with reference to GB _ T11546.1-2008/ISO 899-1 determination of creep properties of plastics.
Table 1 performance data testing
| Item | Example 1 | Example 2 | Example 3 | Example 4 |
| Melt flow index (mL/10min) | 7.45 | 7.29 | 7.74 | 7.53 |
| Impact Strength (KJ/m)2) | 7.01 | 6.94 | 6.77 | 8.17 |
| Tensile Strength (MPa) | 29.85 | 30.56 | 30.70 | 29.96 |
| Tensile creep modulus (MPa) | 1223.85 | 1222.40 | 1228.34 | 1213.38 |
| Item | Example 5 | Example 6 | Example 7 | Example 8 |
| Melt flow index ((mL/10min) | 7.62 | 7.43 | 7.45 | 7.56 |
| Impact Strength (KJ/m)2) | 8.43 | 10.61 | 6.81 | 6.86 |
| Tensile Strength (MPa) | 29.46 | 25.89 | 30.87 | 30.91 |
| Tensile creep modulus (MPa) | 1207.86 | 1061.49 | 1265.67 | 1267.31 |
| Item | Example 9 | Example 10 | Example 11 | Example 12 |
| Melt flow index ((mL/10min) | 7.68 | 7.77 | 9.39 | 9.42 |
| Impact Strength (KJ/m)2) | 9.42 | 9.56 | 9.38 | 9.47 |
| Tensile Strength (MPa) | 35.42 | 35.67 | 35.92 | 36.01 |
| Tensile creep modulus (MPa) | 1771.50 | 1819.17 | 1867.84 | 1872.52 |
| Item | Example 13 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Melt flow index ((mL/10min) | 9.57 | 8.11 | 7.93 | 8.41 |
| Impact Strength (KJ/m)2) | 9.42 | 6.42 | 6.01 | 6.66 |
| Tensile Strength (MPa) | 36.11 | 18.12 | 20.14 | 22.36 |
| Tensile creep modulus (MPa) | 1877.72 | 724.81 | 805.60 | 894.3 |
| Item | Comparative example 4 | |||
| Melt flow index (mL/10min) | 8.86 | |||
| Impact Strength (KJ/m)2) | 5.56 | |||
| Tensile Strength (MPa) | 17.36 | |||
| Tensile creep modulus (MPa) | 694.45 |
It can be seen from the combination of example 3 and comparative examples 1-4 and table 1 that when the blending amount of the PS regrind is 41.2-57.5%, the PS regrind needs to be mixed with creep-resistant HIPS, high impact HIPS and thermoplastic styrene-butadiene rubber in a certain proportion for melting, so as to obtain the creep-resistant recycled PS material with the tensile creep modulus of more than 1000 MPa.
As can be seen by combining examples 3-6 with Table 1, examples 3-6 differ in the impact strength of high impact HIPS, wherein when the impact strength of high impact HIPS is in the range of 9.5-15kg.cm/cm, the impact strength of the PS recycled material, the creep-resistant HIPS, the high impact HIPS and the creep-resistant recycled PS material obtained by mixing and smelting the thermoplastic styrene-butadiene rubber is greater than 8kg.cm/cm and the tensile creep modulus is greater than 1200 MPa.
It can be seen from the combination of example 3 and examples 7-8 and the combination of table 1 that example 3 and examples 7-8 are different in the content of styrene in the thermoplastic styrene-butadiene rubber, wherein when the content of styrene in the thermoplastic styrene-butadiene rubber is in the range of 30-32%, the tensile creep modulus of the creep-resistant recycled PS material obtained by mixing and melting the PS recycled material, the creep-resistant HIPS, the high impact HIPS, and the thermoplastic styrene-butadiene rubber is further increased, which is beneficial to improving the creep resistance of the creep-resistant recycled PS material.
It can be seen from the combination of example 3 and examples 9-10 and from Table 1 that example 3 is different from examples 9-10 in the preparation method of the PS recycled material, and the creep-resistant recycled PS material prepared from the PS recycled material prepared by the methods of examples 9-10 has improved impact strength, tensile strength and tensile creep modulus.
It can be seen from the combination of examples 10-12 and table 1 that the difference between examples 10-12 is that the PS regrind of examples 11-12 is added with a certain amount of calcium stearate on the basis of the PS regrind of example 10, wherein when the creep-resistant recycled PS material is prepared by using the PS regrind added with calcium stearate, the tensile creep modulus of the creep-resistant recycled PS material is further increased, and the fluidity of the creep-resistant recycled PS material is also improved, so that the processability of the creep-resistant recycled PS material is improved.
Claims (10)
1. The creep-resistant regenerated PS material is characterized by being prepared from the following raw materials in percentage by weight:
creep resistant HIPS: 30 to 40 percent of
High impact HIPS: 10 to 15 percent of
Thermoplastic styrene-butadiene rubber: 2.5 to 3.5 percent
Antioxidant: 0 to 0.3 percent
PS renewable material: balance of
The tensile strength of the creep-resistant HIPS is 26-32N/mm2Tensile elastic modulus of 1850-2。
2. The creep-resistant recycled PS material of claim 1, wherein the high impact HIPS has an impact strength of 9.5 to 15 kg.cm/cm.
3. The creep-resistant recycled PS material as claimed in claim 1, wherein the styrene content in the thermoplastic styrene-butadiene rubber is in the range of 30-32%.
4. The creep-resistant recycled PS material as claimed in claim 1, wherein the antioxidant is one or a combination of two of the antioxidants 1076 and 168.
5. The creep-resistant recycled PS material as claimed in claim 1, wherein the PS recycled material is prepared by a method comprising the following steps:
preparing a PS pretreatment material: compressing and deflating the foamed PS waste material to obtain a PS pretreatment material;
preparing a PS reclaimed material: and (3) melting, extruding and granulating the PS pretreatment material to obtain the PS reclaimed material.
6. The creep-resistant recycled PS material according to claim 5, wherein during the preparation of the PS recycled material, sodium bicarbonate, azobisisobutyronitrile and maleimide compounds are further added into the PS pretreatment material, wherein the weight ratio of the PS pretreatment material, the sodium bicarbonate, the azobisisobutyronitrile and the maleimide compounds is 100: (8-12): (0.5-2.0): (0.04-0.08).
7. The creep-resistant recycled PS material as claimed in claim 6, wherein the maleimide compound is any one or more of maleimide, N-4, 4-diphenylmethane bismaleimide and N, N-m-phenylene bismaleimide.
8. The creep-resistant recycled PS material according to claim 6 or 7, wherein calcium stearate is further added to the PS pretreatment material during the preparation of the PS recycled material, and the weight ratio of the azobisisobutyronitrile to the calcium stearate is 1: (2-3).
9. The preparation process of the creep-resistant regenerated PS material according to any one of claims 1 to 8, wherein the creep-resistant regenerated PS material is obtained by uniformly mixing the PS regenerated material, the creep-resistant HIPS, the high impact HIPS, the thermoplastic styrene butadiene rubber and the antioxidant, and then carrying out mixing extrusion and granulation.
10. The process as claimed in claim 9, wherein the mixing and extruding process is carried out in an extruder, the rotation speed of the screw in the extruder is 580-600rpm, the extruder is divided into 8 zones, and the temperatures in the zones are as follows:
zone 1: 195-215 ℃, zone 2: 195-215 ℃, zone 3: 200 ℃ and 220 ℃,4 region: 200 ℃ and 220 ℃, 5 region: 205-: 205-: 210 ℃ 230 ℃, 8 zone: 210 ℃ and 230 ℃; the temperature of the extruder head was 215-.
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