Impact-resistant and flame-retardant polystyrene and its production equipment system and production method

Abstract

This invention relates to an impact-resistant and flame-retardant polystyrene and its production apparatus and method. The raw materials for preparing the impact-resistant and flame-retardant polystyrene include styrene, 1,3-butadiene, acrylate, antimony bromide flame retardant, diluent, antioxidant, lubricant, and initiator. Based on the raw materials provided by this invention, by adjusting the production method and apparatus, when the styrene conversion rate reaches 40-45%, it is mixed with 1,3-butadiene, acrylate, antioxidant, and antimony bromide flame retardant. The resulting impact-resistant and flame-retardant polystyrene has a notched cantilever beam impact strength ≥15 kJ / m. 2 It has a flame retardant rating of V0 and a light transmittance of ≥70%.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, and relates to a polystyrene product, and more particularly to an impact-resistant and flame-retardant polystyrene and its production equipment system and production method. Background Technology

[0002] Polystyrene (GPPS) possesses excellent transparency, rigidity, electrical insulation, and low moisture absorption. It is also inexpensive and easy to process, making it widely used in various instrument housings, lampshades, optical and chemical instrument parts, transparent films, refrigerator drawers, and toys. However, the rigid benzene ring structure in GPPS makes its products brittle, increasing the risk of cracking under external stress. Therefore, toughening modification is necessary.

[0003] Currently, methods for toughening GPPS include using toughening agents. Typical toughening agents include butyl rubber, styrene-butadiene-styrene triblock copolymer (SBS), hydrogenated SBS, ethylene propylene diene monomer (EPDM) rubber, and metallocene polystyrene elastomer (PSE). High-impact polystyrene (HIPS) is an important styrene product derived from these agents.

[0004] For example, CN115109350A discloses a high-performance flame-retardant HIPS material, its preparation method, and its application. The high-performance flame-retardant HIPS material comprises the following components by weight: 36-60 parts GPPS resin, 20-40 parts polyether resin, 10-20 parts butadiene-styrene copolymer, 8-15 parts bromine-antimony flame retardant, and 0.2-2 parts processing aids; the bromine-antimony flame retardant includes bromine-based flame retardants and antimony white flame retardants. The use of bromine-antimony flame retardants improves the flame-retardant properties of the resulting polystyrene product, but severely affects the transparency of the product.

[0005] CN104327437A discloses a modified HIPS composite material, the main components and their weight ratios being: 60-70 parts of recycled HIPS, 15-20 parts of acrylonitrile / butadiene / styrene copolymer (ABS), 10-14 parts of modifier, and 8-12 parts of flame retardant. CN103740026A discloses a modified HIPS formulation, in which the modified HIPS is composed of impact-resistant polystyrene bulk, sulfur dioxide, and nitric acid. The impact-resistant polystyrene bulk accounts for 48-60% of the modified HIPS by weight, sulfur dioxide accounts for 18-21%, and nitric acid accounts for 22-31%. However, the above technical solutions only improve the impact resistance of HIPS and do not address improvements in flame retardancy, heat resistance, or transparency.

[0006] CN109810421A discloses a semi-transparent display HIPS resin and its preparation method. The semi-transparent display HIPS resin comprises the following components in parts by weight: 0-50 parts of high-impact polystyrene resin (HIPS), 30-80 parts of polystyrene (GPPS), 2-20 parts of styrene-butadiene-styrene copolymer (SBS), 1-10 parts of polyisobutylene (PIB), 0.5-3 parts of mineral powder, 0.1-1 parts of light stabilizer, 0.1-1 parts of antioxidant, and 0.2-2 parts of lubricant. By introducing SBS and PIB, it achieves semi-transparent display of white parts while ensuring impact resistance, but it does not improve flame retardant properties.

[0007] Therefore, there is a need to provide an impact-resistant and flame-retardant polystyrene and its production equipment system and production method that simultaneously possess excellent flame retardant properties, temperature resistance, mechanical strength and transparency. Summary of the Invention

[0008] The purpose of this invention is to provide an impact-resistant and flame-retardant polystyrene and its production equipment system and method. By adjusting the production method and equipment, when the styrene conversion rate reaches 40-45%, it is mixed with 1,3-butadiene, acrylate, antioxidant, and antimony dibromoflame retardant, and the final impact-resistant and flame-retardant polystyrene has a cantilever beam notched impact strength ≥15kJ / m. 2 It has a flame retardant rating of V0 and a light transmittance of ≥70%.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] In a first aspect, the present invention provides an impact-resistant and flame-retardant polystyrene, wherein, by weight, the raw materials for preparing the impact-resistant and flame-retardant polystyrene include:

[0011]

[0012]

[0013] The notched impact strength of the impact-resistant and flame-retardant polystyrene beam is ≥15kJ / m. 2 It has a flame retardant rating of V0 and a light transmittance of ≥70%.

[0014] In existing technologies, while the use of bromine-antimony flame retardants can improve the flame retardant properties of polystyrene products, it severely affects the transparency of the resulting products. The impact-retardant flame-retardant polystyrene composition provided by this invention reduces the amount of bromine-antimony flame retardant used compared to existing technologies. When used in conjunction with 1,3-butadiene and acrylates, it ensures both the flame retardant properties of the resulting polystyrene product and a light transmittance of over 70%. Furthermore, the impact-retardant flame-retardant polystyrene obtained by this invention also exhibits a light transmittance of 15 kJ / m². 2The above refers to the impact strength of the cantilever beam notch.

[0015] In the raw materials for preparing impact-resistant and flame-retardant polystyrene provided by the present invention, the weight parts of styrene are 20-25 parts, for example, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts or 25 parts, but not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0016] The weight parts of 1,3-butadiene are 25-30 parts, for example, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts or 30 parts, but not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0017] The acrylate is in parts by weight of 15-20, for example, 15, 16, 17, 18, 19 or 20, but not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0018] The amount of bromoantimony flame retardant is 2-4 parts by weight, for example, 2 parts, 2.5 parts, 3 parts, 3.5 parts or 4 parts, but not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0019] The diluent is in the form of 2-3 parts by weight, for example, 2 parts, 2.2 parts, 2.5 parts, 2.8 parts or 3 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0020] The antioxidant is present in parts by weight of 0.1-0.3, for example, 0.1, 0.2 or 0.3 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0021] The lubricant is in the range of 0.1-0.3 parts by weight, for example, 0.1, 0.2 or 0.3 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0022] The initiator is in the range of 0.01-0.05 parts by weight, for example, 0.01, 0.02, 0.03, 0.04 or 0.05 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0023] Preferably, the acrylate includes methyl acrylate and / or ethyl acrylate, and more preferably a combination of methyl acrylate and ethyl acrylate.

[0024] Preferably, the diluent comprises ethylbenzene.

[0025] Preferably, the antioxidant includes hindered phenolic antioxidants and / or phosphite antioxidants.

[0026] The phosphite antioxidants described in this invention include, but are not limited to, antioxidant 168.

[0027] The hindered phenolic antioxidants described in this invention include, but are not limited to, any one or a combination of at least two of antioxidants 1010, Irganox 1076, or Irganox 245.

[0028] Preferably, the lubricant comprises any one or a combination of at least two of the following: silicone oil, paraffin wax, fatty acid amide lubricant, stearate lubricant, fatty acid ester lubricant, or silicone lubricant.

[0029] Preferably, the initiator includes peroxide initiators and / or azo initiators.

[0030] The peroxide initiators described in this invention include, but are not limited to, dodecyl peroxide.

[0031] Preferably, the bromine-antimony flame retardant is a combination of bromine-based flame retardant and antimony white flame retardant, and the mass ratio of the bromine-based flame retardant to the antimony white flame retardant is 1:(0.8-1.2).

[0032] Preferably, the bromine-based flame retardant is decabromodiphenyl ethane.

[0033] Preferably, the antimony white flame retardant includes any one or a combination of at least two of antimony trioxide, antimony pentoxide, or sodium antimonate.

[0034] Secondly, the present invention provides a method for producing impact-resistant and flame-retardant polystyrene as described in the first aspect, the method comprising the following steps:

[0035] (1) Mix styrene, diluent, lubricant, initiator and antimony bromodiphenyl ether flame retardant according to the formula amount, and carry out prepolymerization reaction to make the conversion rate of styrene reach 25-30%.

[0036] (2) After the prepolymerization reaction is completed, the first polymerization reaction is carried out until the styrene conversion rate reaches 40-45% to obtain the first polymer; the formulation mixes 1,3-butadiene, acrylate, antioxidant, second bromoantimony flame retardant and the first polymer, and carries out subsequent polymerization reaction until the styrene conversion rate reaches more than 75%.

[0037] (3) The polymerization product is subjected to devolatilization treatment, and the material after devolatilization treatment is cooled and granulated to obtain the impact-resistant and flame-retardant polystyrene.

[0038] The total amount of the first bromoantimony flame retardant and the second bromoantimony flame retardant is the same as the amount of bromoantimony flame retardant in the formulation.

[0039] The mass ratio of the first bromoantimony flame retardant to the second bromoantimony flame retardant is 1:(2.5-3.5).

[0040] The production method provided by this invention first mixes styrene, diluent, lubricant, initiator, and antimony bromodiphenyl ether flame retardant, and then achieves a styrene conversion rate of 40-45% through prepolymerization and polymerization reactions. Subsequently, the addition of 1,3-butadiene and acrylate gives the final polystyrene product excellent impact resistance, with a notched cantilever beam impact strength of 15 kJ / m. 2 Furthermore, this invention has discovered that by adding bromoantimony flame retardants in stages, the flame retardant rating can still reach V0 and the transmittance can be above 70% even with a reduced amount of bromoantimony flame retardant added.

[0041] In this invention, the bromine-antimony flame retardant is composed of a first bromine-antimony flame retardant and a second bromine-antimony flame retardant, wherein the mass ratio of the first bromine-antimony flame retardant to the second bromine-antimony flame retardant is 1:(2.5-3.5), for example, it can be 1:2.5, 1:2.7, 1:2.8, 1:3, 1:3.2 or 1:3.5, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0042] Preferably, the prepolymerization reaction in step (1) includes a first prepolymerization reaction and a second prepolymerization reaction carried out sequentially.

[0043] Preferably, the temperature of the first prepolymerization reaction is 130-135°C and the absolute pressure is 50-55 kPa.

[0044] This invention achieves a styrene conversion rate of 6-10% through a prepolymerization reaction.

[0045] Preferably, the temperature of the second prepolymerization reaction is 140-145°C and the absolute pressure is 65-70 kPa.

[0046] Preferably, the temperature of the first polymerization reaction in step (2) is 140-145℃ and the absolute pressure is 160-180kPa.

[0047] Preferably, in step (2), the 1,3-butadiene, acrylate, antioxidant and second bromoantimony flame retardant are mixed and preheated to the same temperature as the first polymer, and then mixed with the first polymer for subsequent polymerization reaction.

[0048] Preferably, the subsequent polymerization reaction in step (2) includes a second polymerization reaction, a third polymerization reaction, and a fourth polymerization reaction.

[0049] Preferably, the temperature of the second polymerization reaction is 150-155°C and the absolute pressure is 165-185 kPa.

[0050] Preferably, the temperature of the third polymerization reaction is 160-165℃ and the absolute pressure is 170-190kPa.

[0051] Preferably, the temperature of the fourth polymerization reaction is 165-170℃ and the absolute pressure is 180-200kPa.

[0052] Preferably, the devolatilization process in step (3) includes a first devolatilization process and a second devolatilization process performed sequentially.

[0053] Preferably, the temperature of the first devolatilization treatment is 228-232℃, and the absolute pressure is 5-10kPa.

[0054] Preferably, the temperature of the second devolatilization treatment is 235-240°C and the absolute pressure is 0.1-0.3 kPa.

[0055] Thirdly, the present invention provides an apparatus for producing impact-resistant and flame-retardant polystyrene. The apparatus system is used to produce the impact-resistant and flame-retardant polystyrene described in the first aspect. The apparatus system includes a styrene storage tank, a diluent storage tank, a lubricant storage tank, an initiator storage tank, a first flame retardant storage tank, a first mixing device, a prepolymerization unit, a first polymerization unit, a second polymerization unit, a devolatilization unit, an acrylate storage tank, a butadiene storage tank, an antioxidant storage tank, a second flame retardant storage tank, and a second mixing device.

[0056] The styrene storage tank, diluent storage tank, lubricant storage tank, initiator storage tank, and first flame retardant storage tank are connected to the inlet of the first mixing device;

[0057] The first mixing device, the prepolymerization unit, the first polymerization unit, the second polymerization unit, and the devolatilization unit are connected in sequence; the outlet of the first mixing device is connected to the inlet of the prepolymerization unit.

[0058] The acrylate storage tank, butadiene storage tank, antioxidant storage tank, and second flame retardant storage tank are connected to the inlet of the second mixing device.

[0059] The outlet of the second mixing device is connected to the connecting pipeline between the first polymerization unit and the second polymerization unit.

[0060] The production apparatus provided by this invention only requires the addition of a raw material storage tank to the existing polystyrene (GPPS) production apparatus. The production of impact-resistant and flame-retardant polystyrene can be achieved by adjusting the preparation process, thus reducing the equipment cost of impact-resistant and flame-retardant polystyrene.

[0061] Preferably, the prepolymerization unit includes a first prepolymerization reaction device and a second prepolymerization reaction device connected in sequence;

[0062] The inlet of the first prepolymerization reactor is connected to the outlet of the first mixing device; the outlet of the second prepolymerization reactor is connected to the first polymerization unit.

[0063] Preferably, the first polymerization unit includes a first polymerization reaction apparatus.

[0064] Preferably, the second polymerization unit includes a second polymerization reactor, a third polymerization reactor, and a fourth polymerization reactor connected in sequence;

[0065] Preferably, the devolatilization unit includes a first devolatilization device and a second devolatilization device connected in sequence; the inlet of the first devolatilization device is connected to the outlet of the fourth polymerization reaction device.

[0066] Preferably, the discharge pipe of the second mixing device is equipped with a preheating device.

[0067] Compared with the prior art, the present invention has the following beneficial effects:

[0068] (1) The impact-resistant and flame-retardant polystyrene composition provided by this invention reduces the amount of bromine-antimony flame retardant used compared to existing technologies. When used in conjunction with 1,3-butadiene and acrylate, it ensures both the flame-retardant properties of the resulting polystyrene product and a light transmittance of over 70%. Furthermore, the impact-resistant and flame-retardant polystyrene obtained by this invention also exhibits a light transmittance of 15 kJ / m². 2 The above cantilever beam notch impact strength;

[0069] (2) The production method provided by this invention first mixes styrene, diluent, lubricant, initiator, and antimony bromodiphenyl ether flame retardant, and then achieves a styrene conversion rate of 40-45% through prepolymerization and polymerization reactions; subsequently, by adding 1,3-butadiene and acrylate, the final polystyrene product has excellent impact resistance, with a notched cantilever beam impact strength of 15 kJ / m. 2 Furthermore, this invention has discovered that by adding bromoantimony flame retardants in stages, the flame retardant rating can still reach V0 and the transmittance can be above 70% even with a reduced amount of bromoantimony flame retardant added. Attached Figure Description

[0070] Figure 1 This is a schematic diagram of the structure of the impact-resistant and flame-retardant polystyrene production apparatus system provided by the present invention.

[0071] Wherein: 1, styrene storage tank; 2, diluent storage tank; 3-1, first flame retardant storage tank; 3-2, second flame retardant storage tank; 4-1, first mixing device; 4-2, second mixing device; 4-3, preheating device; 5-1, first prepolymerization reaction device; 5-2, second prepolymerization reaction device; 6, acrylate storage tank; 7, butadiene storage tank; 8-1, first polymerization reaction device; 8-2, second polymerization reaction device; 8-3, third polymerization reaction device; 8-4, fourth polymerization reaction device; 9-1, first devolatilization device; 9-2, second devolatilization device. Detailed Implementation

[0072] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0073] An embodiment of the present invention provides an impact-resistant and flame-retardant polystyrene, wherein the raw materials for preparing the impact-resistant and flame-retardant polystyrene, by weight, include:

[0074]

[0075] The notched impact strength of the impact-resistant and flame-retardant polystyrene beam is ≥15kJ / m. 2 It has a flame retardant rating of V0 and a light transmittance of ≥70%.

[0076] In existing technologies, while the use of bromine-antimony flame retardants can improve the flame retardant properties of polystyrene products, it severely affects the transparency of the resulting products. The impact-retardant flame-retardant polystyrene composition provided by this invention reduces the amount of bromine-antimony flame retardant used compared to existing technologies. When used in conjunction with 1,3-butadiene and acrylates, it ensures both the flame retardant properties of the resulting polystyrene product and a light transmittance of over 70%. Furthermore, the impact-retardant flame-retardant polystyrene obtained by this invention also exhibits a light transmittance of 15 kJ / m². 2 The above refers to the impact strength of the cantilever beam notch.

[0077] In the raw materials for preparing impact-resistant and flame-retardant polystyrene provided by the present invention, the weight parts of styrene are 20-25 parts, for example, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts or 25 parts, but not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0078] The weight parts of 1,3-butadiene are 25-30 parts, for example, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts or 30 parts, but not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0079] The acrylate is in parts by weight of 15-20, for example, 15, 16, 17, 18, 19 or 20, but not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0080] The amount of bromoantimony flame retardant is 2-4 parts by weight, for example, 2 parts, 2.5 parts, 3 parts, 3.5 parts or 4 parts, but not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0081] The diluent is in the form of 2-3 parts by weight, for example, 2 parts, 2.2 parts, 2.5 parts, 2.8 parts or 3 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0082] The antioxidant is present in parts by weight of 0.1-0.3, for example, 0.1, 0.2 or 0.3 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0083] The lubricant is in the range of 0.1-0.3 parts by weight, for example, 0.1, 0.2 or 0.3 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0084] The initiator is in the range of 0.01-0.05 parts by weight, for example, 0.01, 0.02, 0.03, 0.04 or 0.05 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0085] In some embodiments, the acrylate includes methyl acrylate and / or ethyl acrylate, preferably a combination of methyl acrylate and ethyl acrylate.

[0086] In some embodiments, the diluent includes ethylbenzene.

[0087] In some embodiments, the antioxidant includes hindered phenolic antioxidants and / or phosphite antioxidants.

[0088] The phosphite antioxidants described in this invention include, but are not limited to, antioxidant 168.

[0089] The hindered phenolic antioxidants described in this invention include, but are not limited to, any one or a combination of at least two of antioxidant 1010, Irganox 1076, or Irganox 245. Typical but non-limiting combinations include combinations of antioxidant 1010 and Irganox 1076, combinations of Irganox 1076 and Irganox 245, combinations of antioxidant 1010 and Irganox 245, or combinations of antioxidant 1010, Irganox 1076, and Irganox 245.

[0090] In some embodiments, the lubricant comprises any one or a combination of at least two of silicone oil, paraffin wax, fatty acid amide lubricants, stearate lubricants, fatty acid ester lubricants, or silicone lubricants. Typical but non-limiting combinations include combinations of silicone oil and paraffin wax, combinations of fatty acid amide lubricants and stearate lubricants, combinations of stearate lubricants and fatty acid ester lubricants, combinations of paraffin wax and silicone lubricants, combinations of silicone oil, paraffin wax, and silicone lubricants, or combinations of silicone oil, paraffin wax, fatty acid amide lubricants, stearate lubricants, fatty acid ester lubricants, and silicone lubricants.

[0091] In some embodiments, the initiator includes peroxide initiators and / or azo initiators.

[0092] The peroxide initiators described in this invention include, but are not limited to, dodecyl peroxide.

[0093] In some embodiments, the bromine-antimony flame retardant is a combination of a bromine-based flame retardant and an antimony white flame retardant, wherein the mass ratio of the bromine-based flame retardant to the antimony white flame retardant is 1:(0.8-1.2), for example, it can be 1:0.8, 1:0.9, 1:1, 1:1.1 or 1:1.2, but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0094] In some embodiments, the brominated flame retardant is decabromodiphenyl ethane.

[0095] In some embodiments, the antimony white flame retardant comprises any one or a combination of at least two of antimony trioxide, antimony pentoxide, or sodium antimonate. Typical but non-limiting combinations include combinations of antimony trioxide and antimony pentoxide, combinations of antimony trioxide and sodium antimonate, or combinations of antimony trioxide, antimony pentoxide, and sodium antimonate.

[0096] An embodiment of the present invention provides a method for producing impact-resistant and flame-retardant polystyrene, the method comprising the following steps:

[0097] (1) Mix styrene, diluent, lubricant, initiator and antimony bromodiphenyl ether flame retardant according to the formula amount, and carry out prepolymerization reaction to make the conversion rate of styrene reach 25-30%.

[0098] (2) After the prepolymerization reaction is completed, the first polymerization reaction is carried out until the styrene conversion rate reaches 40-45% to obtain the first polymer; the formulation mixes 1,3-butadiene, acrylate, antioxidant, second bromoantimony flame retardant and the first polymer, and carries out subsequent polymerization reaction until the styrene conversion rate reaches more than 75%.

[0099] (3) The polymerization product is subjected to devolatilization treatment, and the material after devolatilization treatment is cooled and granulated to obtain the impact-resistant and flame-retardant polystyrene.

[0100] The total amount of the first bromoantimony flame retardant and the second bromoantimony flame retardant is the same as the amount of bromoantimony flame retardant in the formulation.

[0101] The mass ratio of the first bromoantimony flame retardant to the second bromoantimony flame retardant is 1:(2.5-3.5).

[0102] The production method provided by this invention first mixes styrene, diluent, lubricant, initiator, and antimony bromodiphenyl ether flame retardant, and then achieves a styrene conversion rate of 40-45% through prepolymerization and polymerization reactions. Subsequently, the addition of 1,3-butadiene and acrylate gives the final polystyrene product excellent impact resistance, with a notched cantilever beam impact strength of 15 kJ / m. 2 Furthermore, this invention has discovered that by adding bromoantimony flame retardants in stages, the flame retardant rating can still reach V0 and the transmittance can be above 70% even with a reduced amount of bromoantimony flame retardant added.

[0103] In this invention, the bromine-antimony flame retardant is composed of a first bromine-antimony flame retardant and a second bromine-antimony flame retardant, wherein the mass ratio of the first bromine-antimony flame retardant to the second bromine-antimony flame retardant is 1:(2.5-3.5), for example, it can be 1:2.5, 1:2.7, 1:2.8, 1:3, 1:3.2 or 1:3.5, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0104] In some embodiments, the prepolymerization reaction in step (1) includes a first prepolymerization reaction and a second prepolymerization reaction performed sequentially.

[0105] In some embodiments, the temperature of the first prepolymerization reaction is 130-135°C and the absolute pressure is 50-55 kPa.

[0106] The temperature of the first prepolymerization reaction is 130-135℃, for example, it can be 130℃, 131℃, 132℃, 133℃, 134℃ or 135℃, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0107] The absolute pressure of the first prepolymerization reaction is 50-55 kPa, for example, it can be 50 kPa, 51 kPa, 52 kPa, 53 kPa, 54 kPa or 55 kPa, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0108] This invention enables the conversion rate of styrene to reach 6-10% through a prepolymerization reaction. For example, it can be 6%, 7%, 8%, 9% or 10%, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0109] In some embodiments, the temperature of the second prepolymerization reaction is 140-145°C and the absolute pressure is 65-70 kPa.

[0110] The temperature of the second prepolymerization reaction is 140-145℃, for example, it can be 140℃, 141℃, 142℃, 143℃, 144℃ or 145℃, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0111] The absolute pressure of the second prepolymerization reaction is 65-70 kPa, for example, it can be 65 kPa, 66 kPa, 67 kPa, 68 kPa, 69 kPa or 70 kPa, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0112] In some embodiments, the temperature of the first polymerization reaction in step (2) is 140-145°C and the absolute pressure is 160-180 kPa.

[0113] The temperature of the first polymerization reaction is 140-145℃, for example, it can be 140℃, 141℃, 142℃, 143℃, 144℃ or 145℃, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0114] The absolute pressure of the first polymerization reaction is 160-180 kPa, for example, it can be 160 kPa, 165 kPa, 170 kPa, 175 kPa or 180 kPa, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0115] In some embodiments, the 1,3-butadiene, acrylate, antioxidant and second antimony bromoflame retardant in step (2) are mixed and preheated to the same temperature as the first polymer, and then mixed with the first polymer for subsequent polymerization reaction.

[0116] In some embodiments, the subsequent polymerization reaction in step (2) includes a second polymerization reaction, a third polymerization reaction, and a fourth polymerization reaction.

[0117] In some embodiments, the temperature of the second polymerization reaction is 150-155°C and the absolute pressure is 165-185 kPa.

[0118] The temperature of the second polymerization reaction is 150-155℃, for example, it can be 150℃, 151℃, 152℃, 153℃, 154℃ or 155℃, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0119] The absolute pressure of the second polymerization reaction is 165-185 kPa, for example, it can be 165 kPa, 170 kPa, 175 kPa, 180 kPa or 185 kPa, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0120] In some embodiments, the temperature of the third polymerization reaction is 160-165°C and the absolute pressure is 170-190 kPa.

[0121] The temperature of the third polymerization reaction is 160-165℃, for example, it can be 160℃, 161℃, 162℃, 163℃, 164℃ or 165℃, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0122] The absolute pressure of the third polymerization reaction is 170-190 kPa, for example, it can be 170 kPa, 175 kPa, 180 kPa, 185 kPa or 190 kPa, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0123] In some embodiments, the temperature of the fourth polymerization reaction is 165-170°C and the absolute pressure is 180-200 kPa.

[0124] The temperature of the fourth polymerization reaction is 165-170℃, for example, it can be 165℃, 166℃, 167℃, 168℃, 169℃ or 170℃, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0125] The absolute pressure of the fourth polymerization reaction is 180-200 kPa, for example, it can be 180 kPa, 185 kPa, 190 kPa, 195 kPa or 200 kPa, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0126] In some embodiments, the devolatilization process in step (3) includes a first devolatilization process and a second devolatilization process performed sequentially.

[0127] In some embodiments, the temperature of the first devolatilization treatment is 228-232°C, and the absolute pressure is 5-10 kPa.

[0128] The temperature of the first devolatilization treatment is 228-232℃, for example, it can be 228℃, 229℃, 230℃, 231℃ or 232℃, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0129] The absolute pressure of the first devolatilization treatment is 5-10 kPa, for example, it can be 5 kPa, 6 kPa, 7 kPa, 8 kPa, 9 kPa or 10 kPa, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0130] In some embodiments, the temperature of the second devolatilization treatment is 235-240°C and the absolute pressure is 0.1-0.3 kPa.

[0131] The temperature of the second devolatilization treatment is 235-240℃, for example, it can be 235℃, 236℃, 237℃, 238℃, 239℃ or 240℃, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0132] The absolute pressure of the second devolatilization treatment is 0.1-0.3 kPa, for example, it can be 0.1 kPa, 0.2 kPa or 0.3 kPa, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0133] In some embodiments, the production apparatus system is used to produce the impact-resistant and flame-retardant polystyrene described in the first aspect. The production apparatus system includes a styrene storage tank, a diluent storage tank, a lubricant storage tank, an initiator storage tank, a first flame retardant storage tank, a first mixing device, a prepolymerization unit, a first polymerization unit, a second polymerization unit, a devolatilization unit, an acrylate storage tank, a butadiene storage tank, an antioxidant storage tank, a second flame retardant storage tank, and a second mixing device.

[0134] The styrene storage tank, diluent storage tank, lubricant storage tank, initiator storage tank, and first flame retardant storage tank are connected to the inlet of the first mixing device;

[0135] The first mixing device, the prepolymerization unit, the first polymerization unit, the second polymerization unit, and the devolatilization unit are connected in sequence; the outlet of the first mixing device is connected to the inlet of the prepolymerization unit.

[0136] The acrylate storage tank, butadiene storage tank, antioxidant storage tank, and second flame retardant storage tank are connected to the inlet of the second mixing device.

[0137] The outlet of the second mixing device is connected to the connecting pipeline between the first polymerization unit and the second polymerization unit.

[0138] The styrene storage tank is used to store and supply styrene; the diluent storage tank is used to store and supply diluent; the lubricant storage tank is used to store and supply lubricant; the initiator storage tank is used to store and supply initiator; the first flame retardant storage tank and the second flame retardant storage tank are used to store and supply a first bromoantimony flame retardant and a second bromoantimony flame retardant; the acrylate storage tank is used to store and supply acrylic acid; the butadiene storage tank is used to store and supply 1,3-butadiene; and the antioxidant storage tank is used to store and supply antioxidant.

[0139] The first mixing device is used to mix styrene, diluent, lubricant, initiator, and antimony bromine flame retardant.

[0140] The second mixing device is used to mix acrylate, 1,3-butadiene, antioxidant, and antimony bromodiphenyl ether flame retardant.

[0141] Preferably, the prepolymerization unit includes a first prepolymerization reaction device and a second prepolymerization reaction device connected in sequence;

[0142] The inlet of the first prepolymerization reactor is connected to the outlet of the first mixing device; the outlet of the second prepolymerization reactor is connected to the first polymerization unit.

[0143] The first prepolymerization reactor is used to carry out a first prepolymerization reaction; the first prepolymerization reactor is used to carry out a second prepolymerization reaction.

[0144] The present invention does not specifically limit the model of the first prepolymerization reaction device and the second prepolymerization reaction device, as long as they can realize the first prepolymerization reaction and the second prepolymerization reaction.

[0145] In some embodiments, the first polymerization unit includes a first polymerization reaction apparatus.

[0146] The first polymerization apparatus is used to carry out the first polymerization reaction.

[0147] The present invention does not specifically limit the model of the first polymerization reaction apparatus, as long as it can realize the first polymerization reaction.

[0148] In some embodiments, the second polymerization unit includes a second polymerization reactor, a third polymerization reactor, and a fourth polymerization reactor connected in sequence.

[0149] The feed inlet of the second polymerization reactor is connected to the discharge outlet of the first polymerization reactor; the discharge outlet of the fourth polymerization reactor is connected to the devolatilization unit.

[0150] The second polymerization apparatus is used to carry out the second polymerization reaction; the third polymerization apparatus is used to carry out the third polymerization reaction; and the fourth polymerization apparatus is used to carry out the fourth polymerization reaction.

[0151] This invention does not specifically limit the model of the second polymerization reactor, the third polymerization reactor, and the fourth polymerization reactor, as long as they can realize the second polymerization reaction, the third polymerization reaction, and the fourth polymerization reaction.

[0152] In some embodiments, the devolatilization unit includes a first devolatilization device and a second devolatilization device connected in sequence; the inlet of the first devolatilization device is connected to the outlet of the fourth polymerization reactor.

[0153] The first devolatilization device is used for the first devolatilization process; the second devolatilization device is used for the second devolatilization process.

[0154] The present invention does not limit the specific models of the first devolatilization device and the second devolatilization device, as long as they can achieve the first devolatilization process and the second devolatilization process.

[0155] In some embodiments, the discharge pipe of the second mixing device is equipped with a preheating device.

[0156] This invention does not limit the specific model of the preheating device, as long as it can preheat the mixture of 1,3-butadiene, acrylate, antioxidant and antimony dibromoflame retardant.

[0157] To clearly illustrate the technical solution of the present invention, a structural schematic diagram of the impact-resistant and flame-retardant polystyrene production apparatus used in a specific embodiment of the present invention is shown below. Figure 1 As shown (some storage tanks are not shown), the production equipment system is used to produce the impact-resistant and flame-retardant polystyrene described in the first aspect. The production equipment system includes a styrene storage tank 1, a diluent storage tank 2, a lubricant storage tank, an initiator storage tank, a first flame retardant storage tank 3-1, a first mixing device 4-1, a prepolymerization unit, a first polymerization unit, a second polymerization unit, a devolatilization unit, an acrylate storage tank 6, a butadiene storage tank 7, an antioxidant storage tank, a second flame retardant storage tank 3-2, and a second mixing device 4-2.

[0158] The styrene storage tank 1, diluent storage tank 2, lubricant storage tank, initiator storage tank, and first flame retardant storage tank 3-1 are connected to the inlet of the first mixing device 4-1;

[0159] The first mixing device 4-1, the prepolymerization unit, the first polymerization unit, the second polymerization unit, and the devolatilization unit are connected in sequence; the outlet of the first mixing device 4-1 is connected to the inlet of the prepolymerization unit; the prepolymerization unit includes a first prepolymerization reaction device 5-1 and a second prepolymerization reaction device 5-1 connected in sequence; the inlet of the first prepolymerization reaction device 5-1 is connected to the outlet of the first mixing device 4-1; the outlet of the second prepolymerization reaction device 5-1 is connected to the first polymerization unit.

[0160] The first polymerization unit includes a first polymerization reaction apparatus 8-1;

[0161] The second polymerization unit includes a second polymerization reactor 8-2, a third polymerization reactor 8-3, and a fourth polymerization reactor 8-4 connected in sequence.

[0162] The acrylate storage tank 6, butadiene storage tank 7, antioxidant storage tank, and second flame retardant storage tank 3-2 are connected to the inlet of the second mixing device 4-2;

[0163] The discharge port of the second mixing device 4-2 is connected to the connecting pipeline between the first polymerization unit and the second polymerization unit; the discharge pipeline of the second mixing device 4-2 is equipped with a preheating device 4-3;

[0164] The devolatilization unit includes a first devolatilization device 9-1 and a second devolatilization device 9-2 connected in sequence; the inlet of the first devolatilization device 9-1 is connected to the outlet of the fourth polymerization reaction device 8-4.

[0165] Example 1

[0166] This embodiment provides a method for producing impact-resistant and flame-retardant polystyrene, wherein the production method comprises, for example, Figure 1 The production process, as shown in the diagram, includes the following steps:

[0167] (1) Styrene, diluent, lubricant, initiator and antimony bromine flame retardant are mixed according to the formula amount, and the first prepolymerization reaction and the second prepolymerization reaction are carried out in sequence to make the conversion rate of styrene reach 27%.

[0168] The temperature of the first prepolymerization reaction is 132°C and the absolute pressure is 52 kPa; the temperature of the second prepolymerization reaction is 142°C and the absolute pressure is 68 kPa.

[0169] (2) After the prepolymerization reaction is completed, the first polymerization reaction is carried out until the styrene conversion rate reaches 42% to obtain the first polymer; 1,3-butadiene, acrylate, antioxidant, second antimony bromoflame retardant and the first polymer are mixed in the formula amount, and the second polymerization reaction, the third polymerization reaction and the fourth polymerization reaction are carried out in sequence until the styrene conversion rate reaches 75%.

[0170] The temperature of the first polymerization reaction is 142°C and the absolute pressure is 170 kPa; the temperature of the second polymerization reaction is 152°C and the absolute pressure is 175 kPa; the temperature of the third polymerization reaction is 162°C and the absolute pressure is 180 kPa; and the temperature of the fourth polymerization reaction is 168°C and the absolute pressure is 190 kPa.

[0171] (3) The polymerization product is subjected to a first devolatilization treatment and a second devolatilization treatment in sequence. The material after the devolatilization treatment is cooled and granulated to obtain the impact-resistant and flame-retardant polystyrene.

[0172] The temperature of the first devolatilization treatment is 230°C and the absolute pressure is 8 kPa; the temperature of the second devolatilization treatment is 238°C and the absolute pressure is 0.2 kPa.

[0173] The total amount of the first bromoantimony flame retardant and the second bromoantimony flame retardant is the same as the amount of bromoantimony flame retardant in the formulation.

[0174] The mass ratio of the first bromoantimony flame retardant to the second bromoantimony flame retardant is 1:3.

[0175] The raw materials for preparing the impact-resistant and flame-retardant polystyrene, by weight, include: 22 parts styrene; 28 parts 1,3-butadiene; 18 parts acrylate; 3 parts bromoantimony flame retardant; 2.5 parts diluent; 0.2 parts antioxidant; 0.2 parts lubricant; and 0.03 parts initiator.

[0176] The acrylate is a combination of methyl acrylate and ethyl acrylate in a mass ratio of 1:1;

[0177] The diluent is ethylbenzene; the antioxidant is Irganox 1076; the lubricant is paraffin wax; the initiator is dodecyl peroxide; and the bromine-antimony flame retardant is a combination of bromine-based flame retardant and antimony white flame retardant in a 1:1 mass ratio.

[0178] The bromine-based flame retardant is decabromodiphenyl ethane, and the antimony white flame retardant is antimony trioxide.

[0179] Example 2

[0180] This embodiment provides a method for producing impact-resistant and flame-retardant polystyrene, wherein the production method comprises, for example, Figure 1 The production process, as shown in the diagram, includes the following steps:

[0181] (1) Styrene, diluent, lubricant, initiator and antimony bromine flame retardant are mixed according to the formula amount, and the first prepolymerization reaction and the second prepolymerization reaction are carried out in sequence to make the conversion rate of styrene reach 25%.

[0182] The temperature of the first prepolymerization reaction is 130°C and the absolute pressure is 50 kPa; the temperature of the second prepolymerization reaction is 140°C and the absolute pressure is 65 kPa.

[0183] (2) After the prepolymerization reaction is completed, the first polymerization reaction is carried out until the styrene conversion rate reaches 40% to obtain the first polymer; 1,3-butadiene, acrylate, antioxidant, second bromoantimony flame retardant and the first polymer are mixed in the formula amount, and the second polymerization reaction, the third polymerization reaction and the fourth polymerization reaction are carried out in sequence until the styrene conversion rate reaches 75%.

[0184] The temperature of the first polymerization reaction is 140℃ and the absolute pressure is 160kPa; the temperature of the second polymerization reaction is 150℃ and the absolute pressure is 165kPa; the temperature of the third polymerization reaction is 160℃ and the absolute pressure is 170kPa; and the temperature of the fourth polymerization reaction is 165℃ and the absolute pressure is 180kPa.

[0185] (3) The polymerization product is subjected to a first devolatilization treatment and a second devolatilization treatment in sequence. The material after the devolatilization treatment is cooled and granulated to obtain the impact-resistant and flame-retardant polystyrene.

[0186] The temperature of the first devolatilization treatment is 228°C and the absolute pressure is 5 kPa; the temperature of the second devolatilization treatment is 235°C and the absolute pressure is 0.1 kPa.

[0187] The total amount of the first bromoantimony flame retardant and the second bromoantimony flame retardant is the same as the amount of bromoantimony flame retardant in the formulation.

[0188] The mass ratio of the first bromoantimony flame retardant to the second bromoantimony flame retardant is 1:2.5.

[0189] The raw material composition for preparing the impact-resistant and flame-retardant polystyrene is the same as that in Example 1.

[0190] Example 3

[0191] This embodiment provides a method for producing impact-resistant and flame-retardant polystyrene, wherein the production method comprises, for example, Figure 1 The production process, as shown in the diagram, includes the following steps:

[0192] (1) Styrene, diluent, lubricant, initiator and antimony bromine flame retardant are mixed according to the formula amount, and the first prepolymerization reaction and the second prepolymerization reaction are carried out in sequence to make the conversion rate of styrene reach 30%.

[0193] The temperature of the first prepolymerization reaction is 135°C and the absolute pressure is 55 kPa; the temperature of the second prepolymerization reaction is 145°C and the absolute pressure is 70 kPa.

[0194] (2) After the prepolymerization reaction is completed, the first polymerization reaction is carried out until the styrene conversion rate reaches 45% to obtain the first polymer; 1,3-butadiene, acrylate, antioxidant, second antimony bromoflame retardant and the first polymer are mixed in the formula amount, and the second polymerization reaction, the third polymerization reaction and the fourth polymerization reaction are carried out in sequence until the styrene conversion rate reaches 75%.

[0195] The temperature of the first polymerization reaction is 145°C and the absolute pressure is 180 kPa; the temperature of the second polymerization reaction is 155°C and the absolute pressure is 185 kPa; the temperature of the third polymerization reaction is 165°C and the absolute pressure is 190 kPa; and the temperature of the fourth polymerization reaction is 170°C and the absolute pressure is 200 kPa.

[0196] (3) The polymerization product is subjected to a first devolatilization treatment and a second devolatilization treatment in sequence. The material after the devolatilization treatment is cooled and granulated to obtain the impact-resistant and flame-retardant polystyrene.

[0197] The temperature of the first devolatilization treatment is 232°C and the absolute pressure is 10 kPa; the temperature of the second devolatilization treatment is 240°C and the absolute pressure is 0.3 kPa.

[0198] The total amount of the first bromoantimony flame retardant and the second bromoantimony flame retardant is the same as the amount of bromoantimony flame retardant in the formulation.

[0199] The mass ratio of the first bromoantimony flame retardant to the second bromoantimony flame retardant is 1:3.5.

[0200] The raw material composition for preparing the impact-resistant and flame-retardant polystyrene is the same as that in Example 1.

[0201] Example 4

[0202] This embodiment provides a method for producing impact-resistant and flame-retardant polystyrene. The process steps of the production method are the same as those in Embodiment 1, except that:

[0203] The raw materials for preparing the impact-resistant and flame-retardant polystyrene, by weight, include: 20 parts styrene; 30 parts 1,3-butadiene; 15 parts acrylate; 2 parts bromoantimony flame retardant; 2 parts diluent; 0.1 parts antioxidant; 0.1 parts lubricant; and 0.01 parts initiator.

[0204] The acrylate is a combination of methyl acrylate and ethyl acrylate in a mass ratio of 1:0.8;

[0205] The diluent is ethylbenzene; the antioxidant is antioxidant 168; the lubricant is paraffin wax; the initiator is dodecyl peroxide; and the bromine-antimony flame retardant is a combination of bromine-based flame retardant and antimony white flame retardant in a mass ratio of 1:0.8.

[0206] The bromine-based flame retardant is decabromodiphenyl ethane, and the antimony white flame retardant is sodium antimonate.

[0207] Example 5

[0208] This embodiment provides a method for producing impact-resistant and flame-retardant polystyrene. The process steps of the production method are the same as those in Embodiment 1, except that:

[0209] The raw materials for preparing the impact-resistant and flame-retardant polystyrene, by weight, include: 25 parts styrene; 25 parts 1,3-butadiene; 20 parts acrylate; 4 parts bromoantimony flame retardant; 3 parts diluent; 0.3 parts antioxidant; 0.3 parts lubricant; and 0.05 parts initiator.

[0210] The acrylate is a combination of methyl acrylate and ethyl acrylate in a mass ratio of 1:1.2;

[0211] The diluent is ethylbenzene; the antioxidant is Irganox 245; the lubricant is paraffin wax; the initiator is dodecyl peroxide; and the bromine-antimony flame retardant is a combination of bromine-based flame retardant and antimony white flame retardant in a mass ratio of 1:1.2.

[0212] The bromine-based flame retardant is decabromodiphenyl ethane, and the antimony white flame retardant is antimony pentoxide.

[0213] Example 6

[0214] This embodiment provides a method for producing impact-resistant and flame-retardant polystyrene, except that the acrylate is only methyl acrylate, and all other aspects are the same as in Example 1.

[0215] Example 7

[0216] This embodiment provides a method for producing impact-resistant and flame-retardant polystyrene, except that the acrylate is only ethyl acrylate, and all other aspects are the same as in Example 1.

[0217] Example 8

[0218] This embodiment provides a method for producing impact-resistant and flame-retardant polystyrene. Except for the mass ratio of bromine-based flame retardant to antimony white flame retardant being 1:0.5, all other aspects are the same as in Example 1.

[0219] Example 9

[0220] This embodiment provides a method for producing impact-resistant and flame-retardant polystyrene. Except for the mass ratio of bromine-based flame retardant to antimony white flame retardant being 1:1.5, all other aspects are the same as in Example 1.

[0221] Comparative Example 1

[0222] This comparative example provides a method for producing impact-resistant and flame-retardant polystyrene, the method being as follows: Figure 1The production process, as shown in the diagram, includes the following steps:

[0223] (1) Styrene, diluent, lubricant, initiator and antimony bromine flame retardant are mixed according to the formula amount, and the first prepolymerization reaction and the second prepolymerization reaction are carried out in sequence to make the conversion rate of styrene reach 27%.

[0224] The temperature of the first prepolymerization reaction is 132°C and the absolute pressure is 52 kPa; the temperature of the second prepolymerization reaction is 142°C and the absolute pressure is 68 kPa.

[0225] (2) After the prepolymerization reaction is completed, the first polymerization reaction is carried out until the styrene conversion rate reaches 42% to obtain the first polymer; 1,3-butadiene, acrylate, antioxidant and the first polymer are mixed in the formula amount, and the second polymerization reaction, the third polymerization reaction and the fourth polymerization reaction are carried out in sequence until the styrene conversion rate reaches 75%;

[0226] The temperature of the first polymerization reaction is 142°C and the absolute pressure is 170 kPa; the temperature of the second polymerization reaction is 152°C and the absolute pressure is 175 kPa; the temperature of the third polymerization reaction is 162°C and the absolute pressure is 180 kPa; and the temperature of the fourth polymerization reaction is 168°C and the absolute pressure is 190 kPa.

[0227] (3) The polymerization product is subjected to a first devolatilization treatment and a second devolatilization treatment in sequence. The material after the devolatilization treatment is cooled and granulated to obtain the impact-resistant and flame-retardant polystyrene.

[0228] The temperature of the first devolatilization treatment is 230°C and the absolute pressure is 8 kPa; the temperature of the second devolatilization treatment is 238°C and the absolute pressure is 0.2 kPa.

[0229] The raw material composition for preparing the impact-resistant and flame-retardant polystyrene is the same as that in Example 1.

[0230] Comparative Example 2

[0231] This comparative example provides a method for producing impact-resistant and flame-retardant polystyrene, the method being as follows: Figure 1 The production process, as shown in the diagram, includes the following steps:

[0232] (1) Mix styrene, diluent, lubricant and initiator according to the formula amount, and carry out the first prepolymerization reaction and the second prepolymerization reaction in sequence to make the styrene conversion rate reach 27%;

[0233] The temperature of the first prepolymerization reaction is 132°C and the absolute pressure is 52 kPa; the temperature of the second prepolymerization reaction is 142°C and the absolute pressure is 68 kPa.

[0234] (2) After the prepolymerization reaction is completed, the first polymerization reaction is carried out until the styrene conversion rate reaches 42% to obtain the first polymer; 1,3-butadiene, acrylate, antioxidant, antimony bromide flame retardant and the first polymer are mixed in the formula amount, and the second polymerization reaction, the third polymerization reaction and the fourth polymerization reaction are carried out in sequence until the styrene conversion rate reaches 75%.

[0235] The temperature of the first polymerization reaction is 142°C and the absolute pressure is 170 kPa; the temperature of the second polymerization reaction is 152°C and the absolute pressure is 175 kPa; the temperature of the third polymerization reaction is 162°C and the absolute pressure is 180 kPa; and the temperature of the fourth polymerization reaction is 168°C and the absolute pressure is 190 kPa.

[0236] (3) The polymerization product is subjected to a first devolatilization treatment and a second devolatilization treatment in sequence. The material after the devolatilization treatment is cooled and granulated to obtain the impact-resistant and flame-retardant polystyrene.

[0237] The temperature of the first devolatilization treatment is 230°C and the absolute pressure is 8 kPa; the temperature of the second devolatilization treatment is 238°C and the absolute pressure is 0.2 kPa.

[0238] The raw material composition for preparing the impact-resistant and flame-retardant polystyrene is the same as that in Example 1.

[0239] Comparative Example 3

[0240] This comparative example provides a method for producing impact-resistant and flame-retardant polystyrene, which is the same as in Example 1 except that acrylate is replaced with 1,3-butadiene in equal amounts.

[0241] Performance Characterization

[0242] The light transmittance, cantilever beam notched impact strength, tensile strength, and flame retardant properties of the polystyrene products obtained in the examples and comparative examples were measured. The test results are shown in Table 1.

[0243] Light transmittance was tested according to ISO 13468-1 standard using a 2mm thick board.

[0244] The notched impact strength of the cantilever beam was tested according to ISO 179-1:2010(E) standard, with an impact energy of 5.5J and a test temperature of 23℃.

[0245] Tensile strength was tested according to ISO 527-1:2019 standard, under test conditions of 50 mm / min;

[0246] Flame retardant performance was tested according to UL94 standards using a 1.6mm flame retardant sample.

[0247] Table 1

[0248]

[0249] In summary:

[0250] (1) The impact-resistant and flame-retardant polystyrene composition provided by this invention reduces the amount of bromine-antimony flame retardant used compared to existing technologies. When used in conjunction with 1,3-butadiene and acrylate, it ensures both the flame-retardant properties of the resulting polystyrene product and a light transmittance of over 70%. Furthermore, the impact-resistant and flame-retardant polystyrene obtained by this invention also exhibits a light transmittance of 15 kJ / m². 2 The above cantilever beam notch impact strength;

[0251] (2) The production method provided by this invention first mixes styrene, diluent, lubricant, initiator, and antimony bromodiphenyl ether flame retardant, and then achieves a styrene conversion rate of 40-45% through prepolymerization and polymerization reactions; subsequently, by adding 1,3-butadiene and acrylate, the final polystyrene product has excellent impact resistance, with a notched cantilever beam impact strength of 15 kJ / m. 2 Furthermore, this invention has discovered that by adding bromoantimony flame retardant in stages, the flame retardant rating can still reach V0 and the transmittance can be above 70% even with a reduced amount of bromoantimony flame retardant added.

[0252] (3) The production device provided by the present invention only requires the addition of a raw material storage tank to the existing polystyrene (GPPS) production device. The production of impact-resistant and flame-retardant polystyrene can be achieved by adjusting the preparation process. Therefore, the device cost of impact-resistant and flame-retardant polystyrene is reduced.

[0253] The above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. An impact-resistant and flame-retardant polystyrene, characterized in that, The raw materials for preparing the impact-resistant and flame-retardant polystyrene, by weight, include: 20-25 parts styrene; 25-30 parts of 1,3-butadiene; 15-20 parts acrylate; 2-4 parts of bromine-antimony flame retardant; 2-3 parts diluent; Antioxidant 0.1-0.3 parts; Lubricant 0.1-0.3 parts; Initiator 0.01-0.05 parts; The bromine-antimony flame retardant is a combination of bromine-based flame retardant and antimony white flame retardant, and the mass ratio of the bromine-based flame retardant to the antimony white flame retardant is 1:(0.8-1.2). The notched impact strength of the impact-resistant and flame-retardant polystyrene beam is ≥15kJ / m. 2 It has a flame retardant rating of V0 and a light transmittance of ≥70%. The impact-resistant and flame-retardant polystyrene is prepared by the following production method, which includes the following steps: (1) Mix styrene, diluent, lubricant, initiator and antimony bromodiphenyl ether flame retardant according to the formula amount, and carry out a prepolymerization reaction to make the styrene conversion rate reach 25-30%; (2) After the prepolymerization reaction is completed, the first polymerization reaction is carried out until the conversion rate of styrene reaches 40-45% to obtain the first polymer; the formulation mixes 1,3-butadiene, acrylate, antioxidant, second bromoantimony flame retardant and the first polymer, and carries out subsequent polymerization reaction until the conversion rate of styrene reaches more than 75%; (3) The polymerization product is subjected to devolatilization treatment, and the material after devolatilization treatment is cooled and granulated to obtain the impact-resistant and flame-retardant polystyrene; The total amount of the first bromoantimony flame retardant and the second bromoantimony flame retardant is the same as the amount of bromoantimony flame retardant in the formulation. The mass ratio of the first bromoantimony flame retardant to the second bromoantimony flame retardant is 1:(2.5-3.5).

2. The impact-resistant and flame-retardant polystyrene according to claim 1, characterized in that, The acrylates include methyl acrylate and / or ethyl acrylate; The diluent includes ethylbenzene; The antioxidants include hindered phenolic antioxidants and / or phosphite antioxidants; The lubricant includes any one or a combination of at least two of the following: silicone oil, paraffin wax, fatty acid amide lubricant, stearate lubricant, fatty acid ester lubricant, or silicone lubricant; The initiator includes peroxide initiators and / or azo initiators.

3. The impact-resistant and flame-retardant polystyrene according to claim 1, characterized in that, The bromine-based flame retardant is decabromodiphenyl ethane; The antimony white flame retardant includes any one or a combination of at least two of antimony trioxide, antimony pentoxide, or sodium antimonate.

4. A method for producing impact-resistant and flame-retardant polystyrene as described in any one of claims 1-3, characterized in that, The production method includes the following steps: (1) Mix styrene, diluent, lubricant, initiator and antimony bromodiphenyl ether flame retardant according to the formula amount, and carry out a prepolymerization reaction to make the styrene conversion rate reach 25-30%; (2) After the prepolymerization reaction is completed, the first polymerization reaction is carried out until the conversion rate of styrene reaches 40-45% to obtain the first polymer; the formulation mixes 1,3-butadiene, acrylate, antioxidant, second bromoantimony flame retardant and the first polymer, and carries out subsequent polymerization reaction until the conversion rate of styrene reaches more than 75%; (3) The polymerization product is subjected to devolatilization treatment, and the material after devolatilization treatment is cooled and granulated to obtain the impact-resistant and flame-retardant polystyrene; The total amount of the first bromoantimony flame retardant and the second bromoantimony flame retardant is the same as the amount of bromoantimony flame retardant in the formulation. The mass ratio of the first bromoantimony flame retardant to the second bromoantimony flame retardant is 1:(2.5-3.5).

5. The production method according to claim 4, characterized in that, The prepolymerization reaction in step (1) includes a first prepolymerization reaction and a second prepolymerization reaction carried out sequentially; The temperature of the first prepolymerization reaction is 130-135℃, and the absolute pressure is 50-55kPa; The temperature of the second prepolymerization reaction is 140-145℃, and the absolute pressure is 65-70kPa.

6. The production method according to claim 4, characterized in that, In step (2), the temperature of the first polymerization reaction is 140-145℃ and the absolute pressure is 160-180kPa.

7. The production method according to claim 4, characterized in that, The subsequent polymerization reactions in step (2) include a second polymerization reaction, a third polymerization reaction, and a fourth polymerization reaction; The second polymerization reaction is carried out at a temperature of 150-155℃ and an absolute pressure of 165-185 kPa. The temperature of the third polymerization reaction is 160-165℃, and the absolute pressure is 170-190kPa; The temperature of the fourth polymerization reaction is 165-170℃, and the absolute pressure is 180-200kPa.

8. The production method according to claim 4, characterized in that, The devolatilization process in step (3) includes a first devolatilization process and a second devolatilization process performed sequentially; The temperature of the first devolatilization treatment is 228-232℃, and the absolute pressure is 5-10kPa; The temperature of the second devolatilization treatment is 235-240℃, and the absolute pressure is 0.1-0.3kPa.

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