Radiation-resistant polypropylene color master batch and preparation method thereof

Abstract

The invention discloses an irradiation-resistant polypropylene color master batch and a preparation method thereof, and belongs to the technical field of polypropylene functional color master batches, the irradiation-resistant polypropylene color master batch comprises the following components by weight: 85-90 parts of polypropylene, 1-15 parts of an antioxidant, 1-15 parts of a light stabilizer, 7-8 parts of functional reflective particles, 5-6 parts of a flame retardant, 0.25-0.3 part of a nucleating agent, 0.5-0.6 part of a lubricant, and 1.7-2 parts of a coupling agent. 3.8 to 4.2 parts of pigment; the polypropylene color master batch prepared by the invention has excellent aging resistance and irradiation resistance, and also has excellent mechanical properties and heat resistance.

Description

Technical Field

[0001] The invention relates to the technical field of polypropylene functional masterbatch, and in particular to a radiation-resistant polypropylene masterbatch and a preparation method thereof. Background Art

[0002] Polypropylene is a thermoplastic polymer made from propylene monomers through addition polymerization. It is a widely used general polymer material. Polypropylene has a low density (0.89-0.91g / cm 3 ), has good mechanical properties and heat resistance, and also has excellent chemical stability and electrical insulation. It is widely used in various fields such as food packaging, building materials, automotive parts, textiles and clothing. However, polypropylene has poor aging resistance and is not flame retardant. The poor aging resistance is specifically manifested in that polypropylene is easily aged by ultraviolet rays, heat, and oxygen. In order to solve the above problems, the most commonly used method is to add various additives to polypropylene, such as antioxidants, light stabilizers, nucleating agents, flame retardants, etc. Commonly used antioxidants are phosphorus antioxidants and sulfur antioxidants, commonly used light stabilizers are hindered amine light stabilizers, commonly used nucleating agents are inorganic nucleating agents and metal salt nucleating agents in organic nucleating agents, and commonly used flame retardants are metal hydroxide flame retardants.

[0003] Radiation sterilization is the use of electromagnetic waves (such as electron beams, X-rays and gamma rays) generated by ionizing radiation to kill microorganisms on materials. At present, polypropylene materials used in medical and food packaging often need to be irradiated and sterilized. Radiation sterilization rays can destroy the structure of biological macromolecules, thereby inhibiting or killing microorganisms, but polypropylene has poor radiation resistance, and its mechanical properties will drop significantly after irradiation. In order to improve the radiation resistance of polypropylene, in addition to adding antioxidants and light stabilizers, functional inorganic materials with reflective effects are also added, such as titanium dioxide, barium sulfate, talcum powder, etc. However, when the above-mentioned additives are added to polypropylene to prepare polypropylene products, the following problems exist: inorganic nucleating agents and functional inorganic materials with reflective effects have poor compatibility with polypropylene, and inorganic nucleating agents and functional inorganic materials with reflective effects have poor dispersibility in polypropylene and are easy to agglomerate, which will further affect the mechanical properties of polypropylene and the heat resistance of polypropylene. In addition, metal hydroxide flame retardants also have the problem of poor dispersibility, which further affects the mechanical properties and heat resistance of polypropylene.

[0004] To address the above-mentioned problems, the most commonly used method is to perform surface modification on inorganic nucleating agents, reflective functional inorganic materials, and flame retardants, thereby improving the compatibility of inorganic nucleating agents, reflective functional inorganic materials with polypropylene, and improving the dispersibility of inorganic nucleating agents, reflective functional inorganic materials, and flame retardants. However, the following problems exist in surface modification: First, surface modification is mainly carried out by grafting through the reaction of coupling agents with hydroxyl groups on the surfaces of inorganic nucleating agents, reflective functional inorganic materials, and flame retardants. However, there is a problem of low grafting efficiency during grafting, which leads to an unclear surface modification effect, and there are still problems of poor compatibility and poor dispersibility after surface modification; Second, since inorganic nucleating agents, reflective functional inorganic materials, and flame retardants all have agglomeration problems, the coupling agent cannot fully contact the surfaces of inorganic nucleating agents, reflective functional inorganic materials, and flame retardants during surface modification, resulting in uneven surface modification effects, which further leads to problems of poor compatibility and poor dispersibility after surface modification.

[0005] Therefore, it is an urgent problem to develop a method for preparing radiation-resistant polypropylene masterbatch, which can reduce the reduction in mechanical properties of polypropylene materials caused by radiation while ensuring the mechanical properties, heat resistance and flame retardancy of the polypropylene masterbatch. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a radiation-resistant polypropylene masterbatch and a preparation method thereof. The prepared polypropylene masterbatch has excellent aging resistance and radiation resistance, as well as excellent mechanical properties and heat resistance.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: A radiation-resistant polypropylene masterbatch, comprising, by weight: 85-90 parts of polypropylene, 1-15 parts of antioxidant, 1-15 parts of light stabilizer, 7-8 parts of functional reflective particles, 5-6 parts of flame retardant, 0.25-0.3 parts of nucleating agent, 0.5-0.6 parts of lubricant, 1.7-2 parts of coupling agent, and 3.8-4.2 parts of pigment; The melt index of the polypropylene at 230° C. and 2.16 kg is 35 g / 10 min; The antioxidant is one or a combination of tris(2,4-di-tert-butylphenyl)phosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, and tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester; The trade name of the tris(2,4-di-tert-butylphenyl)phosphite is Antioxidant 168; The trade name of the bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite is Antioxidant 626; The trade name of the tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester is antioxidant 1010; The light stabilizer is one or a combination of an organic phosphorus compound, a hindered amine compound, and a phenol compound; The organic phosphorus compound is trioctyl phosphate, trilauryl phosphite, tridecyl phosphite, octyl diphenyl phosphite, tris(2-phenylphenyl)phosphite, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, tris(2,4-di-tert-butylphenyl)phosphite, 4,4'-isopropyl diphenyl C12-15-ol phosphite, 4,4'-butylenebis(6-tert-butyl-3-methylphenyl)phosphite phenol), 4,4'-butylenebis-(3-methyl-6-tert-butylphenyl)-tetrakis(tridecyl) diphosphite, tris(2,4-di-tert-butylphenyl) phosphite, triethyl phosphite, triphenyl phosphite, 4,4'-butylenebis(6-tert-butyl-3-methylphenol), diphenyl isodecyl phosphite, isopropylated triphenyl phosphate, tetrakis(2,4-di-tert-butylphenol)-4,4'-biphenyl diphosphite or a combination thereof; The hindered amine compound is one or a combination of 2,2,6,6-tetramethylpiperidine derivatives and 1,2,2,6,6-pentamethylpiperidine derivatives; The 2,2,6,6-tetramethylpiperidine derivatives are benzoic acid (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) ester, sebacate bis (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) ester, nitrogen tris [acetic acid (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) ester], N,N'-bis (2,2,6,6-tetramethylpiperidinyl) hexanediamine, 2,2,6,6-tetramethyl-4-piperidinyl stearate, N,N'-bis (2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine and 2,4,6-trichloro-1,3,5-triazine and N-butyl-1-butylamine and N-butyl-2,2,6,6-tetramethyl-4 -piperidinamine, a polymer of the reaction product of N,N'-bis-(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine and 2,4,6-trichloro-1,3,5-triazine and a reaction product of 1,1,3,3-tetramethylbutylamine, poly-{[6-[(1,1,3,3-tetramethylbutyl)-amino]1,3,5,-triazine-2,4-diyl][(2,2,6,6-tetramethylpiperidinyl)-imino]-1,6-hexanediyl-[(2,2,6,6-tetramethylpiperidinyl)-imino], poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinethanol) ester; The trade name of the polymer of the reaction product of N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine with 2,4,6-trichloro-1,3,5-triazine and N-butyl-1-butylamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine is Light Stabilizer 2020; The product of the reaction of the polymer of N,N'-bis-(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine and 2,4,6-trichloro-1,3,5-triazine and 1,1,3,3-tetramethylbutylamine is called Light Stabilizer 944; The trade name of the poly-{[6-[(1,1,3,3-tetramethylbutyl)-amino]1,3,5,-triazine-2,4-diyl][(2,2,6,6-tetramethylpiperidinyl)-imino]-1,6-hexanediyl-[(2,2,6,6-tetramethylpiperidinyl)-imino] is light stabilizer 944; The trade name of the poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinylethanol) succinate is light stabilizer 622; The 1,2,2,6,6-pentamethylpiperidine derivative is one or a combination of tris(1,2,2,6,6-pentamethyl-4-hydroxypiperidine) phosphite, bis(1,2,2,6,6-pentamethyl-4-hydroxypiperidine) sebacate, and bis(1,2,2,6,6-pentamethyl-4-hydroxypiperidine) 2-ethyl-2-(4-hydroxy-3,5-tri-butylbenzyl)malonate; The phenol compound is one or a combination of 2,6-di-tert-butyl-p-cresol, propyl gallate, 6-tert-butyl-m-cresol, 6-tert-butyl-2,4-dimethylphenol, and 2,6-di-tert-butyl-4-methylphenol; The preparation method of the functional reflective particles is as follows: adding rutile titanium dioxide and polyethylene glycol 400 to a ball mill for ball milling, controlling the ball-to-material ratio in the ball milling to be (14-16):1, the ball milling speed to be 300-350 rpm, the time to be 2-2.5 hours, adding a calcium chloride aqueous solution, continuing the ball milling for 50-60 minutes, taking out from the ball mill, vacuum drying at 80-90° C., and then adding a sodium stearate aqueous solution to the ball mill for ball milling, controlling the ball-to-material ratio in the ball milling to be (14-16):1, the ball milling speed to be 300-350 rpm, the time to be 20-30 minutes, taking out from the ball mill, vacuum drying at 80-90° C., and obtaining reflective particles; In the preparation of the functional reflective particles, the dosage ratio of rutile titanium dioxide, polyethylene glycol 400, calcium chloride aqueous solution, and sodium stearate aqueous solution is (200-210) g: (32-35) g: (170-190) mL: (200-230) mL; The average particle size of the rutile titanium dioxide is 300 nm; The concentration of the calcium chloride aqueous solution is 10wt%; The concentration of the sodium stearate aqueous solution is 5wt%.

[0008] The flame retardant is prepared by adding a hydrotalcite synergist and a zinc chloride aqueous solution into a ball mill for ball milling, controlling the ball-to-material ratio in the ball milling to be 14-16:1, the ball milling speed to be 300-350 rpm, the ball milling time to be 30-40 min, adding a polyethyleneimine aqueous solution, continuing the ball milling for 1.5-2 h, taking out from the ball mill, and vacuum drying at 80-90° C. to obtain the flame retardant; In the preparation of the flame retardant, the dosage ratio of the hydrotalcite synergist, the zinc chloride aqueous solution, and the polyethyleneimine aqueous solution is (470-500) g: (200-250) mL: (200-230) mL; The concentration of the zinc chloride aqueous solution is 10wt%; The concentration of the polyethyleneimine aqueous solution is 5wt%; The molecular weight of polyethyleneimine in the polyethyleneimine aqueous solution is 10000; The hydrotalcite synergist is hydrotalcite DHT-4A; The nucleating agent is nucleating agent NA-11; The lubricant is one or a combination of polyethylene wax and pentaerythritol stearate; The coupling agent is vinyl triethoxysilane; The pigment is one of pigment red 48:2, pigment yellow 191, pigment black 7, pigment violet 23, pigment blue 15:3, and pigment green 7.

[0009] A method for preparing the aforementioned radiation-resistant polypropylene masterbatch, comprising adding polypropylene, light stabilizer, flame retardant, reflective particles, hydrotalcite synergist, nucleating agent, plasticizer, coupling agent, and pigment into a high-speed mixer for high-speed mixing, and then adding the mixture into a twin-screw extruder for melt extrusion and granulation to obtain the radiation-resistant polypropylene masterbatch; The speed of the twin-screw extruder in the melt extrusion is 400-450rpm, and the processing temperature is: the temperature of zone 1 is 180-190°C, the temperature of zone 2 is 190-200°C, the temperature of zone 3 is 200-210°C, the temperature of zone 4 is 195-200°C, and the temperature of zone 5 is 190-195°C.

[0010] Compared with the prior art, the present invention has the following beneficial effects: (1) The radiation-resistant polypropylene masterbatch of the present invention uses functional reflective particles. When preparing the functional reflective particles, rutile titanium dioxide is first combined with polyethylene glycol 400, and the polyethylene glycol 400 is adsorbed on the surface of the rutile titanium dioxide to improve the dispersibility and the number of surface functional groups of the rutile titanium dioxide. Then, it is mixed with an aqueous solution of calcium chloride. The calcium chloride is combined with the polyethylene glycol 400 through chelation to adsorb calcium ions on the outer layer. Finally, it is combined with an aqueous solution of sodium stearate. The sodium stearate is adsorbed on the outer layer through interaction with the calcium ions. The introduction of sodium stearate can improve the dispersibility and Compatibility with polypropylene. After sodium stearate is combined with calcium ions, it can also play the role of nucleating agent, halogen absorber and lubricant, thereby improving the aging resistance and mechanical properties of polypropylene. A flame retardant containing hydrotalcite DHT-4A is also used. When preparing the flame retardant, the hydrotalcite DHT-4A is first mixed with an aqueous zinc chloride solution, and the zinc chloride is adsorbed on the surface and interlayer of the hydrotalcite DHT-4A. Then, it is mixed with polyethyleneimine, and the polyethyleneimine is adsorbed on the surface and interlayer of the hydrotalcite DHT-4A through the action of zinc ions, thereby improving the dispersibility of the hydrotalcite DHT-4A and the compatibility with polypropylene; (2) The radiation-resistant polypropylene masterbatch of the present invention has a melt index of 31.2-32.7 g / 10 min at 230° C. and 2.16 kg, and a filtration performance of 0.6-1.0 MPa / g; (3) The surface resistivity of the nonwoven fabric prepared from the radiation-resistant polypropylene masterbatch of the present invention is 0.9×10 9 -2.5×10 9 Ω; (4) The radiation-resistant polypropylene masterbatch of the present invention has excellent mechanical properties. The surface resistivity of the non-woven fabric prepared from the radiation-resistant polypropylene masterbatch of the present invention is 36.87-39.80 N / 5 cm in longitudinal strength and 17.38-18.84 N / 5 cm in transverse strength. (5) The limiting oxygen index of the non-woven fabric prepared from the radiation-resistant polypropylene masterbatch of the present invention is 26.0-28.8%; (6) The color fastness of the non-woven fabric prepared from the radiation-resistant polypropylene masterbatch of the present invention is grade 5; (7) The radiation-resistant polypropylene masterbatch of the present invention has excellent heat resistance, and the heat deformation temperature of the non-woven fabric prepared from the radiation-resistant polypropylene masterbatch of the present invention is 113-121°C; (8) The radiation-resistant polypropylene masterbatch of the present invention has excellent aging resistance. After the non-woven fabric prepared from the radiation-resistant polypropylene masterbatch of the present invention is left to stand at -20°C for 30 days, the longitudinal strength decrease rate is 3.15-3.38%, and the transverse strength decrease rate is 3.00-3.14%; (9) The radiation-resistant polypropylene masterbatch of the present invention has excellent radiation resistance. When the non-woven fabric prepared from the radiation-resistant polypropylene masterbatch of the present invention is irradiated with X-rays with an irradiation dose of 50 KGy, the longitudinal strength decrease rate is 2.08-2.48%, and the transverse strength decrease rate is 1.91-2.17%; when the non-woven fabric prepared from the radiation-resistant polypropylene masterbatch of the present invention is irradiated with γ-rays with an irradiation dose of 50 KGy, the longitudinal strength decrease rate is 2.30-2.64%, and the transverse strength decrease rate is 2.21-2.47%; when the non-woven fabric prepared from the radiation-resistant polypropylene masterbatch of the present invention is irradiated with electron beams with an irradiation dose of 50 KGy, the longitudinal strength decrease rate is 3.23-3.50%, and the transverse strength decrease rate is 2.97-3.43%. DETAILED DESCRIPTION

[0011] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described.

[0012] Example 1 A radiation-resistant polypropylene masterbatch, comprising, by weight: 85 parts of polypropylene, 1 part of antioxidant, 1 part of light stabilizer, 7 parts of functional reflective particles, 5 parts of flame retardant, 0.25 parts of nucleating agent, 0.5 parts of lubricant, 1.7 parts of coupling agent, and 3.8 parts of pigment; The melt index of the polypropylene at 230° C. and 2.16 kg is 35 g / 10 min; The antioxidant is tris(2,4-di-tert-butylphenyl)phosphite; The trade name of the tris(2,4-di-tert-butylphenyl)phosphite is Antioxidant 168; The light stabilizer is an organic phosphorus compound, specifically trioctyl phosphate; The preparation method of the functional reflective particles is as follows: 200g of rutile titanium dioxide and 32g of polyethylene glycol 400 are added to a ball mill for ball milling, the ball-to-material ratio in the ball milling is controlled to be 14:1, the ball milling speed is 300rpm, the time is 2h, 170mL of calcium chloride aqueous solution is added, the ball milling is continued for 50min, the mixture is taken out from the ball mill, and vacuum dried at 80°C, and then 200mL of sodium stearate aqueous solution are added to the ball mill for ball milling, the ball-to-material ratio in the ball milling is controlled to be 14:1, the ball milling speed is 300rpm, the time is 20min, the mixture is taken out from the ball mill, and vacuum dried at 80°C to obtain reflective particles; The average particle size of the rutile titanium dioxide is 300 nm; The concentration of the calcium chloride aqueous solution is 10wt%; The concentration of the sodium stearate aqueous solution is 5wt%.

[0013] The flame retardant is prepared by adding 470 g of a hydrotalcite synergist and 200 mL of a zinc chloride aqueous solution into a ball mill for ball milling, controlling the ball-to-material ratio in the ball milling to be 14:1, the ball milling speed to be 300 rpm, the ball milling time to be 30 min, adding 200 mL of a polyethyleneimine aqueous solution, continuing the ball milling for 1.5 h, taking out from the ball mill, and vacuum drying at 80° C. to obtain a flame retardant; The concentration of the zinc chloride aqueous solution is 10wt%; The concentration of the polyethyleneimine aqueous solution is 5wt%; The molecular weight of polyethyleneimine in the polyethyleneimine aqueous solution is 10000; The hydrotalcite synergist is hydrotalcite DHT-4A; The nucleating agent is nucleating agent NA-11; The lubricant is polyethylene wax; The coupling agent is vinyl triethoxysilane; The pigment is Pigment Red 48:2; In the Pigment Red 48:2, 48 is the pigment number, and 2 is the variant number of the pigment; A method for preparing the aforementioned radiation-resistant polypropylene masterbatch, specifically comprising: adding polypropylene, light stabilizer, flame retardant, reflective particles, hydrotalcite synergist, nucleating agent, plasticizer, coupling agent, and pigment into a high-speed mixer for high-speed mixing, and then adding into a twin-screw extruder for melt extrusion and granulation to obtain the radiation-resistant polypropylene masterbatch; The rotation speed of the twin-screw extruder in the melt extrusion is 400 rpm, and the processing temperatures are: zone 1 temperature 180°C, zone 2 temperature 190°C, zone 3 temperature 200°C, zone 4 temperature 195°C, zone 5 temperature 190°C.

[0014] Example 2 The light stabilizer trioctyl phosphate in Example 1 is replaced by trilauryl phosphite in the organic phosphorus compound, and the rest of the technical scheme remains unchanged; Example 3 The light stabilizer trioctyl phosphate in Example 1 is replaced by tridecyl phosphite in the organic phosphorus compound, and the rest of the technical scheme remains unchanged; Example 4 The light stabilizer trioctyl phosphate in Example 1 is replaced by octyl diphenyl phosphite in the organophosphorus compound, and the rest of the technical scheme remains unchanged; Example 5 The light stabilizer trioctyl phosphate in Example 1 is replaced by tris(2-phenylphenyl)phosphite in the organophosphorus compound, and the rest of the technical scheme remains unchanged; Example 6 The light stabilizer trioctyl phosphate in Example 1 is replaced by 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane in the organophosphorus compound, and the rest of the technical scheme remains unchanged; Example 7 The light stabilizer trioctyl phosphate in Example 1 is replaced by tris(2,4-di-tert-butylphenyl) phosphite in the organic phosphorus compound, and the rest of the technical scheme remains unchanged; Example 8 The light stabilizer trioctyl phosphate in Example 1 is replaced by 4,4'-p-isopropyl diphenyl C12-15-ol phosphite in the organophosphorus compound, and the rest of the technical scheme remains unchanged; Example 9 The light stabilizer trioctyl phosphate in Example 1 is replaced by 4,4'-butylenebis(6-tert-butyl-3-methylphenol) in the organophosphorus compound, and the rest of the technical scheme remains unchanged; Example 10 The light stabilizer trioctyl phosphate in Example 1 is replaced by 4,4'-butylene bis-(3-methyl-6-tert-butylphenyl)-tetrakis(tridecyl) diphosphite in the organophosphorus compound, and the rest of the technical scheme remains unchanged; Embodiment 11 The light stabilizer trioctyl phosphate in Example 1 is replaced by tris(2,4-di-tert-butylphenyl) phosphite in the organic phosphorus compound, and the rest of the technical scheme remains unchanged; Example 12 The light stabilizer trioctyl phosphate in Example 1 is replaced by triethyl phosphite in the organic phosphorus compound, and the rest of the technical scheme remains unchanged; Example 13 The light stabilizer trioctyl phosphate in Example 1 is replaced by triphenyl phosphite in the organophosphorus compound, and the rest of the technical scheme remains unchanged; Embodiment 14 The light stabilizer trioctyl phosphate in Example 1 is replaced by 4,4'-butylenebis(6-tert-butyl-3-methylphenol) in the organophosphorus compound, and the rest of the technical scheme remains unchanged; Embodiment 15 The light stabilizer trioctyl phosphate in Example 1 is replaced by diphenyl isodecyl phosphite in the organic phosphorus compound, and the rest of the technical scheme remains unchanged; Example 16 The light stabilizer trioctyl phosphate in Example 1 is replaced by isopropylated triphenyl phosphate in the organophosphorus compound, and the rest of the technical scheme remains unchanged; Embodiment 17 The light stabilizer trioctyl phosphate in Example 1 is replaced by tetrakis(2,4-di-tert-butylphenol)-4,4'-biphenyl diphosphite in the organophosphorus compound, and the rest of the technical scheme remains unchanged; Embodiment 18 A radiation-resistant polypropylene masterbatch, comprising, by weight: 88 parts of polypropylene, 5 parts of antioxidant, 5 parts of light stabilizer, 7.5 parts of functional reflective particles, 5.5 parts of flame retardant, 0.28 parts of nucleating agent, 0.55 parts of lubricant, 1.9 parts of coupling agent, and 4 parts of pigment; The melt index of the polypropylene at 230° C. and 2.16 kg is 35 g / 10 min; The antioxidant is bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite; The trade name of the bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite is Antioxidant 626; The light stabilizer is a hindered amine compound, specifically benzoic acid (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) ester in a 2,2,6,6-tetramethylpiperidinyl derivative; The preparation method of the functional reflective particles is as follows: 205g of rutile titanium dioxide and 34g of polyethylene glycol 400 are added to a ball mill for ball milling, the ball-to-material ratio in the ball milling is controlled to be 15:1, the ball milling speed is 320rpm, the time is 2.5h, 180mL of calcium chloride aqueous solution is added, the ball milling is continued for 55min, the mixture is taken out from the ball mill, and vacuum dried at 85°C, and then 220mL of sodium stearate aqueous solution are added to the ball mill for ball milling, the ball-to-material ratio in the ball milling is controlled to be 15:1, the ball milling speed is 320rpm, the time is 25min, the mixture is taken out from the ball mill, and vacuum dried at 85°C to obtain reflective particles; The average particle size of the rutile titanium dioxide is 300 nm; The concentration of the calcium chloride aqueous solution is 10wt%; The concentration of the sodium stearate aqueous solution is 5wt%.

[0015] The flame retardant is prepared by adding 480 g of a hydrotalcite synergist and 220 mL of a zinc chloride aqueous solution into a ball mill for ball milling, wherein the ball-to-material ratio in the ball milling is controlled to be 15:1, the ball milling speed is 320 rpm, and the ball milling time is 35 min. 220 mL of a polyethyleneimine aqueous solution is added, and the ball milling is continued for 1.5 h. The mixture is taken out from the ball mill and vacuum dried at 85° C. to obtain a flame retardant. The concentration of the zinc chloride aqueous solution is 10wt%; The concentration of the polyethyleneimine aqueous solution is 5wt%; The molecular weight of polyethyleneimine in the polyethyleneimine aqueous solution is 10000; The hydrotalcite synergist is hydrotalcite DHT-4A; The nucleating agent is nucleating agent NA-11; The lubricant is polyethylene wax; The coupling agent is vinyl triethoxysilane; The pigment is Pigment Yellow 191; The 191 in the Pigment Yellow 191 is the pigment number; A method for preparing the aforementioned radiation-resistant polypropylene masterbatch, specifically comprising: adding polypropylene, light stabilizer, flame retardant, reflective particles, hydrotalcite synergist, nucleating agent, plasticizer, coupling agent, and pigment into a high-speed mixer for high-speed mixing, and then adding into a twin-screw extruder for melt extrusion and granulation to obtain the radiation-resistant polypropylene masterbatch; The rotation speed of the twin-screw extruder in the melt extrusion is 420 rpm, and the processing temperature is: the temperature of zone 1 is 185°C, the temperature of zone 2 is 195°C, the temperature of zone 3 is 205°C, the temperature of zone 4 is 197°C, and the temperature of zone 5 is 190°C.

[0016] Embodiment 19 The light stabilizer benzoic acid (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) ester in Example 20 is replaced by bis (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) sebacate in the hindered amine compound, and the rest of the technical scheme remains unchanged.

[0017] Embodiment 20 The light stabilizer benzoic acid (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) ester in Example 20 is replaced by nitrogen tris [acetate (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) ester] in the hindered amine compound, and the rest of the technical scheme remains unchanged.

[0018] Embodiment 21 The light stabilizer benzoic acid (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) ester in Example 20 is replaced by N,N'-bis(2,2,6,6-tetramethylpiperidinyl)hexanediamine in the hindered amine compound, and the rest of the technical scheme remains unchanged.

[0019] Embodiment 22 The light stabilizer benzoic acid (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) ester in Example 20 is replaced by 2,2,6,6-tetramethyl-4-piperidinyl stearate in the hindered amine compound, and the rest of the technical scheme remains unchanged.

[0020] Embodiment 23 The light stabilizer benzoic acid (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) ester in Example 20 is replaced by a polymer of the reaction product of N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine and 2,4,6-trichloro-1,3,5-triazine and N-butyl-1-butylamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine in the hindered amine compound, and the rest of the technical scheme remains unchanged; The polymer of the reaction product of N,N′-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine with 2,4,6-trichloro-1,3,5-triazine and N-butyl-1-butylamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine is marketed under the trade name Light Stabilizer 2020.

[0021] Embodiment 24 The light stabilizer benzoic acid (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) ester in Example 20 is replaced by the reaction product of the polymer of N,N'-bis-(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine and 2,4,6-trichloro-1,3,5-triazine and 1,1,3,3-tetramethylbutylamine in the hindered amine compound, and the rest of the technical scheme remains unchanged; The product of the reaction of the polymer of N,N′-bis-(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine and 2,4,6-trichloro-1,3,5-triazine and 1,1,3,3-tetramethylbutylamine is known as Light Stabilizer 944.

[0022] Embodiment 25 The light stabilizer benzoic acid (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) ester in Example 20 is replaced by poly-{[6-[(1,1,3,3-tetramethylbutyl)-amino]1,3,5,-triazine-2,4-diyl][(2,2,6,6-tetramethylpiperidinyl)-imino]-1,6-hexanediyl-[(2,2,6,6-tetramethylpiperidinyl)-imino] in the hindered amine compound, and the rest of the technical scheme remains unchanged; The trade name of the poly-{[6-[(1,1,3,3-tetramethylbutyl)-amino]1,3,5,-triazine-2,4-diyl][(2,2,6,6-tetramethylpiperidinyl)-imino]-1,6-hexanediyl-[(2,2,6,6-tetramethylpiperidinyl)-imino] is Light Stabilizer 944.

[0023] Embodiment 26 The light stabilizer benzoic acid (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) ester in Example 20 is replaced by polysuccinic acid (4-hydroxy-2,2,6,6-tetramethyl-1-piperidinylethanol) ester in the hindered amine compound, and the rest of the technical scheme remains unchanged; The trade name of the poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinylethanol) succinate is Light Stabilizer 622.

[0024] Embodiment 27 A radiation-resistant polypropylene masterbatch, comprising, by weight: 89 parts of polypropylene, 10 parts of antioxidant, 10 parts of light stabilizer, 7.8 parts of functional reflective particles, 6 parts of flame retardant, 0.27 parts of nucleating agent, 0.58 parts of lubricant, 1.8 parts of coupling agent, and 4.1 parts of pigment; The melt index of the polypropylene at 230° C. and 2.16 kg is 35 g / 10 min; The antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; The trade name of the tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester is antioxidant 1010; The light stabilizer is a hindered amine compound, specifically tris(1,2,2,6,6-pentamethyl-4-hydroxypiperidinyl)phosphite in a 1,2,2,6,6-pentamethylpiperidinyl derivative; the preparation method of the functional reflective particles is: 208g of rutile titanium dioxide and 34g of polyethylene glycol 400 are added to a ball mill for ball milling, the ball-to-material ratio in the ball milling is controlled to be 15:1, the ball milling speed is 350rpm, the time is 2h, 180mL of calcium chloride aqueous solution is added, the ball milling is continued for 55min, the ball milling is taken out from the ball mill, and vacuum drying is performed at 90°C, and then 220mL of sodium stearate aqueous solution is added to the ball mill for ball milling, the ball-to-material ratio in the ball milling is controlled to be 15:1, the ball milling speed is 320rpm, the time is 27min, the ball mill is taken out from the ball mill, and vacuum drying is performed at 90°C to obtain reflective particles; The average particle size of the rutile titanium dioxide is 300 nm; The concentration of the calcium chloride aqueous solution is 10wt%; The concentration of the sodium stearate aqueous solution is 5 wt %.

[0025] The flame retardant is prepared by adding 480 g of a hydrotalcite synergist and 240 mL of a zinc chloride aqueous solution into a ball mill for ball milling, controlling the ball-to-material ratio in the ball milling to be 15:1, the ball milling speed to be 350 rpm, the ball milling time to be 40 min, adding 220 mL of a polyethyleneimine aqueous solution, continuing the ball milling for 2 h, taking out from the ball mill, and vacuum drying at 90° C. to obtain a flame retardant; The concentration of the zinc chloride aqueous solution is 10wt%; The concentration of the polyethyleneimine aqueous solution is 5wt%; The molecular weight of polyethyleneimine in the polyethyleneimine aqueous solution is 10000; The hydrotalcite synergist is hydrotalcite DHT-4A; The nucleating agent is nucleating agent NA-11; The lubricant is pentaerythritol stearate; The coupling agent is vinyl triethoxysilane; The pigment is Pigment Black 7; The 7 in the Pigment Black 7 is the pigment number; A method for preparing the aforementioned radiation-resistant polypropylene masterbatch, specifically comprising: adding polypropylene, light stabilizer, flame retardant, reflective particles, hydrotalcite synergist, nucleating agent, plasticizer, coupling agent, and pigment into a high-speed mixer for high-speed mixing, and then adding into a twin-screw extruder for melt extrusion and granulation to obtain the radiation-resistant polypropylene masterbatch; The rotation speed of the twin-screw extruder in the melt extrusion is 450 rpm, and the processing temperature is: the temperature of zone 1 is 185°C, the temperature of zone 2 is 195°C, the temperature of zone 3 is 205°C, the temperature of zone 4 is 200°C, and the temperature of zone 5 is 195°C.

[0026] Embodiment 28 The light stabilizer tris(1,2,2,6,6-pentamethyl-4-hydroxypiperidinyl) phosphite in Example 25 is replaced by bis(1,2,2,6,6-pentamethyl-4-hydroxypiperidinyl) sebacate in the hindered amine compound, and the rest of the technical scheme remains unchanged.

[0027] Embodiment 29 The light stabilizer tris(1,2,2,6,6-pentamethyl-4-hydroxypiperidinyl) phosphite in Example 25 is replaced with 2-ethyl-2-(4-hydroxy-3,5-tributylbenzyl)malonic acid bis(1,2,2,6,6-pentamethyl-4-hydroxypiperidinyl) ester in the hindered amine compound, and the rest of the technical scheme remains unchanged.

[0028] Embodiment 30 A radiation-resistant polypropylene masterbatch, comprising, by weight: 90 parts of polypropylene, 15 parts of antioxidant, 15 parts of light stabilizer, 8 parts of functional reflective particles, 6 parts of flame retardant, 0.3 parts of nucleating agent, 0.6 parts of lubricant, 2 parts of coupling agent, and 4.2 parts of pigment; The melt index of the polypropylene at 230° C. and 2.16 kg is 35 g / 10 min; The antioxidant is tris(2,4-di-tert-butylphenyl)phosphite; The trade name of the tris(2,4-di-tert-butylphenyl)phosphite is Antioxidant 168; The light stabilizer is a phenol compound, specifically 2,6-di-tert-butyl-p-cresol; The preparation method of the functional reflective particles is as follows: 210g of rutile titanium dioxide and 35g of polyethylene glycol 400 are added to a ball mill for ball milling, the ball-to-material ratio in the ball milling is controlled to be 16:1, the ball milling speed is 350rpm, the time is 2.5h, 190mL of calcium chloride aqueous solution is added, the ball milling is continued for 60min, the mixture is taken out from the ball mill, and vacuum dried at 90°C, and then 230mL of sodium stearate aqueous solution are added to the ball mill for ball milling, the ball-to-material ratio in the ball milling is controlled to be 16:1, the ball milling speed is 350rpm, the time is 30min, the mixture is taken out from the ball mill, and vacuum dried at 90°C to obtain reflective particles; The average particle size of the rutile titanium dioxide is 300 nm; The concentration of the calcium chloride aqueous solution is 10wt%; The concentration of the sodium stearate aqueous solution is 5 wt %.

[0029] The flame retardant is prepared by adding 500 g of a hydrotalcite synergist and 250 mL of a zinc chloride aqueous solution into a ball mill for ball milling, wherein the ball-to-material ratio in the ball milling is controlled to be 16:1, the ball milling speed is 350 rpm, the ball milling time is 40 min, 230 mL of a polyethyleneimine aqueous solution is added, the ball milling is continued for 2 h, the mixture is taken out from the ball mill, and vacuum dried at 90° C. to obtain a flame retardant; The concentration of the zinc chloride aqueous solution is 10wt%; The concentration of the polyethyleneimine aqueous solution is 5wt%; The molecular weight of polyethyleneimine in the polyethyleneimine aqueous solution is 10000; The hydrotalcite synergist is hydrotalcite DHT-4A; The nucleating agent is nucleating agent NA-11; The lubricant is pentaerythritol stearate; The coupling agent is vinyl triethoxysilane; The pigment is Pigment Violet 23; The 23 in the Pigment Violet 23 is the pigment number; A method for preparing the aforementioned radiation-resistant polypropylene masterbatch, specifically comprising: adding polypropylene, light stabilizer, flame retardant, reflective particles, hydrotalcite synergist, nucleating agent, plasticizer, coupling agent, and pigment into a high-speed mixer for high-speed mixing, and then adding into a twin-screw extruder for melt extrusion and granulation to obtain the radiation-resistant polypropylene masterbatch; The speed of the twin-screw extruder in the melt extrusion is 450 rpm, and the processing temperature is: the temperature of zone 1 is 190°C, the temperature of zone 2 is 200°C, the temperature of zone 3 is 210°C, the temperature of zone 4 is 200°C, and the temperature of zone 5 is 195°C.

[0030] Embodiment 31 The light stabilizer 2,6-di-tert-butyl-p-cresol in Example 29 is replaced by propyl gallate in the hindered amine compound, and the pigment violet 23 is replaced by pigment blue 15:3, and the rest of the technical scheme remains unchanged; In the Pigment Blue 15:3, 15 is the pigment number, and 3 is the variant number of the pigment.

[0031] Embodiment 32 The light stabilizer 2,6-di-tert-butyl-p-cresol in Example 29 is replaced by 6-tert-butyl-m-cresol in the hindered amine compound, and the pigment violet 23 is replaced by pigment blue 15:3, and the rest of the technical scheme remains unchanged; In the Pigment Blue 15:3, 15 is the pigment number, and 3 is the variant number of the pigment.

[0032] Embodiment 33 The light stabilizer 2,6-di-tert-butyl-p-cresol in Example 29 is replaced by 6-tert-butyl-2,4-dimethylphenol in the hindered amine compound, and the pigment violet 23 is replaced by pigment green 7, and the rest of the technical scheme remains unchanged; The 7 in the Pigment Green 7 is the pigment number.

[0033] Embodiment 34 The light stabilizer 2,6-di-tert-butyl-p-cresol in Example 29 is replaced by 2,6-di-tert-butyl-4-methylphenol in the hindered amine compound, and the pigment violet 23 is replaced by pigment green 7, and the rest of the technical scheme remains unchanged; The 7 in the Pigment Green 7 is the pigment number.

[0034] Comparative Example 1 On the basis of the technical solution of Example 1, in the composition of the radiation-resistant polypropylene masterbatch, rutile titanium dioxide with an average particle size of 300 nm is used to replace the functional reflective particles, and the rest of the technical solutions remain unchanged.

[0035] Comparative Example 2 On the basis of the technical solution of Example 1, in the composition of the radiation-resistant polypropylene masterbatch, hydrotalcite DHT-4A or the like is used to replace the flame retardant, and the rest of the technical solutions remain unchanged.

[0036] Performance Test 1 The melt index and filtration performance of the radiation-resistant polypropylene masterbatch prepared in Example 1, Example 18, Example 27, Example 30, Comparative Example 1, and Comparative Example 2 were tested, and the test results are as follows:

[0037] Considering that the difference between Example 1 and Example 2-17, Example 18 and Example 19-26, Example 27 and Example 28-29, Example 30 and Example 31-34 is only the light stabilizer, or the light stabilizer and the pigment, and the light stabilizers used belong to the same category, therefore, the performance indicators between Example 1 and Example 2-17, Example 18 and Example 19-26, Example 27 and Example 28-29, Example 30 and Example 31-34 are not much different, therefore, the melt index and filtration performance of Example 2-17, Example 19-26, Example 28-29, Example 31-34 are sorted out respectively, and the range is taken, and the results are as follows:

[0038] Performance Test 2 The radiation-resistant polypropylene masterbatches prepared in Examples 1-34 and Comparative Examples 1-2 were respectively added to a high-speed mixer with polypropylene at a mass ratio of 5:95 for high-speed mixing, added to a twin-screw extruder for melt extrusion, then added to a melt filter for filtration, added to a spinning machine for spinning, airflow stretching, added to a mesh curtain for meshing, and added to a hot rolling mill for hot rolling to obtain a polypropylene non-woven fabric; The temperature during the melt extrusion is 210°C; The spinning temperature is 250°C; The temperature during the hot rolling is 190° C. and the pressure is 20 MPa.

[0039] Then, the surface resistivity, longitudinal strength, transverse strength, limiting oxygen index, color fastness, and heat deformation temperature of the polypropylene non-woven fabrics prepared from the radiation-resistant polypropylene masterbatch of Example 1, Example 18, Example 27, Example 30, Comparative Example 1, and Comparative Example 2 were tested, and the test results are as follows:

[0040] The polypropylene nonwoven was placed at -20°C for 30 days, and then the transverse strength and longitudinal strength were tested. The transverse strength reduction rate and longitudinal strength reduction rate were calculated. The calculation results are as follows:

[0041] The polypropylene non-woven fabric was irradiated with X-rays at a dose of 50KGy, and then the transverse strength and longitudinal strength were tested. The transverse strength reduction rate and longitudinal strength reduction rate were calculated. The calculation results are as follows:

[0042] The polypropylene non-woven fabric was irradiated with γ-rays with a irradiation dose of 50KGy, and then the transverse strength and longitudinal strength were tested. The transverse strength reduction rate and longitudinal strength reduction rate were calculated. The calculation results are as follows:

[0043] The polypropylene non-woven fabric was irradiated with an electron beam with an irradiation dose of 50KGy, and then the transverse strength and longitudinal strength were tested. The transverse strength reduction rate and longitudinal strength reduction rate were calculated. The calculation results are as follows:

[0044] Considering that the difference between Example 1 and Example 2-17, Example 18 and Example 19-26, Example 27 and Example 28-29, Example 30 and Example 31-34 is only the light stabilizer, or the light stabilizer and the pigment, and the light stabilizers used belong to the same category, therefore, the performance indicators between Example 1 and Example 2-17, Example 18 and Example 19-26, Example 27 and Example 28-29, Example 30 and Example 31-34 are not much different, therefore, Example 2- 17. The surface resistivity, longitudinal strength, transverse strength, limiting oxygen index, color fastness, heat deformation temperature, strength reduction rate after standing at -20°C for 30 days, strength reduction rate after X-ray irradiation with a radiation dose of 50 KGy, strength reduction rate after γ-ray irradiation with a radiation dose of 50 KGy, and strength reduction rate after electron beam irradiation with a radiation dose of 50 KGy of Examples 19-26, Examples 28-29, and Examples 31-34 were sorted out and their ranges were taken. The results are as follows:

[0045] Unless otherwise specified, all percentages used in the present invention are by mass.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A radiation-resistant polypropylene masterbatch, characterized in that: In parts by weight, it comprises: 85-90 parts of polypropylene, 1-15 parts of antioxidant, 1-15 parts of light stabilizer, 7-8 parts of functional reflective particles, 5-6 parts of flame retardant, 0.25-0.3 parts of nucleating agent, 0.5-0.6 parts of lubricant, 1.7-2 parts of coupling agent, and 3.8-4.2 parts of pigment; The preparation method of the functional reflective particles comprises: mixing rutile titanium dioxide and polyethylene glycol 400, ball milling, adding calcium chloride aqueous solution, continuing ball milling, vacuum drying, mixing with sodium stearate aqueous solution, ball milling, vacuum drying, and obtaining reflective particles; In the preparation of the functional reflective particles, the dosage ratio of rutile titanium dioxide, polyethylene glycol 400, calcium chloride aqueous solution, and sodium stearate aqueous solution is (200-210) g: (32-35) g: (170-190) mL: (200-230) mL; The flame retardant is prepared by mixing a hydrotalcite synergist and a zinc chloride aqueous solution, ball milling the mixture, adding a polyethyleneimine aqueous solution, continuing the ball milling, and vacuum drying to obtain the flame retardant. In the preparation of the flame retardant, the dosage ratio of the hydrotalcite synergist, the zinc chloride aqueous solution, and the polyethyleneimine aqueous solution is (470-500) g: (200-250) mL: (200-230) mL.

2. The radiation-resistant polypropylene masterbatch according to claim 1, characterized in that: The antioxidant is one or a combination of tris(2,4-di-tert-butylphenyl)phosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, and tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester; The light stabilizer is one or a combination of an organic phosphorus compound, a hindered amine compound, and a phenol compound.

3. The radiation-resistant polypropylene masterbatch according to claim 2, characterized in that: The organic phosphorus compound is trioctyl phosphate, trilauryl phosphite, tridecyl phosphite, octyl diphenyl phosphite, tris(2-phenylphenyl)phosphite, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, tris(2,4-di-tert-butylphenyl)phosphite, 4,4'-isopropyl diphenyl C12-15-ol phosphite, 4,4'-butylenebis(6-tert-butyl-3-methylphenyl)phosphite phenol), 4,4'-butylenebis-(3-methyl-6-tert-butylphenyl)-tetrakis(tridecyl) diphosphite, tris(2,4-di-tert-butylphenyl) phosphite, triethyl phosphite, triphenyl phosphite, 4,4'-butylenebis(6-tert-butyl-3-methylphenol), diphenyl isodecyl phosphite, isopropylated triphenyl phosphate, tetrakis(2,4-di-tert-butylphenol)-4,4'-biphenyl diphosphite or a combination thereof.

4. The radiation-resistant polypropylene masterbatch according to claim 2, characterized in that: The hindered amine compound is one or a combination of 2,2,6,6-tetramethylpiperidine derivatives and 1,2,2,6,6-pentamethylpiperidine derivatives; The 2,2,6,6-tetramethylpiperidine derivatives are benzoic acid (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) ester, sebacate bis (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) ester, nitrogen tris [acetic acid (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) ester], N,N'-bis (2,2,6,6-tetramethylpiperidinyl) hexanediamine, 2,2,6,6-tetramethyl-4-piperidinyl stearate, N,N'-bis (2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine and 2,4,6-trichloro-1,3,5-triazine and N-butyl-1-butylamine and N-butyl-2,2,6,6-tetramethyl-4 -piperidinamine, a polymer of the reaction product of N,N'-bis-(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine and 2,4,6-trichloro-1,3,5-triazine and a reaction product of 1,1,3,3-tetramethylbutylamine, poly-{[6-[(1,1,3,3-tetramethylbutyl)-amino]1,3,5,-triazine-2,4-diyl][(2,2,6,6-tetramethylpiperidinyl)-imino]-1,6-hexanediyl-[(2,2,6,6-tetramethylpiperidinyl)-imino], poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinethanol) ester; The 1,2,2,6,6-pentamethylpiperidine derivative is one or a combination of tris(1,2,2,6,6-pentamethyl-4-hydroxypiperidine) phosphite, bis(1,2,2,6,6-pentamethyl-4-hydroxypiperidine) sebacate, and bis(1,2,2,6,6-pentamethyl-4-hydroxypiperidine) 2-ethyl-2-(4-hydroxy-3,5-tributylbenzyl)malonate.

5. The radiation-resistant polypropylene masterbatch according to claim 2, characterized in that: The phenol compound is one or a combination of 2,6-di-tert-butyl-p-cresol, propyl gallate, 6-tert-butyl-m-cresol, 6-tert-butyl-2,4-dimethylphenol and 2,6-di-tert-butyl-4-methylphenol.

6. The radiation-resistant polypropylene masterbatch according to claim 1, characterized in that: In the preparation of the functional reflective particles, the average particle size of the rutile titanium dioxide is 300 nm; The concentration of the calcium chloride aqueous solution is 10wt%; The concentration of the sodium stearate aqueous solution is 5 wt %.

7. The radiation-resistant polypropylene masterbatch according to claim 1, characterized in that: In the preparation of the flame retardant, the concentration of the zinc chloride aqueous solution is 10wt%; The concentration of the polyethyleneimine aqueous solution is 5wt%; The molecular weight of polyethyleneimine in the polyethyleneimine aqueous solution is 10000; The hydrotalcite synergist is hydrotalcite DHT-4A; The nucleating agent is nucleating agent NA-11; The lubricant is one or a combination of polyethylene wax and pentaerythritol stearate; The coupling agent is vinyltriethoxysilane.

8. The radiation-resistant polypropylene masterbatch according to claim 1, characterized in that: The melt index of the polypropylene at 230° C. and 2.16 kg is 35 g / 10 min; The pigment is one of pigment red 48:2, pigment yellow 191, pigment black 7, pigment violet 23, pigment blue 15:3, and pigment green 7.

9. A method for preparing the radiation-resistant polypropylene masterbatch according to any one of claims 1 to 8, characterized in that: Polypropylene, light stabilizer, flame retardant, reflective particles, hydrotalcite synergist, nucleating agent, plasticizer, coupling agent and pigment are added into a high-speed mixer for high-speed mixing, and then added into a twin-screw extruder for melt extrusion and granulation to obtain radiation-resistant polypropylene masterbatch.

10. The method for preparing radiation-resistant polypropylene masterbatch according to claim 9, characterized in that: The speed of the twin-screw extruder in the melt extrusion is 400-450rpm, and the processing temperature is: the temperature of zone 1 is 180-190°C, the temperature of zone 2 is 190-200°C, the temperature of zone 3 is 200-210°C, the temperature of zone 4 is 195-200°C, and the temperature of zone 5 is 190-195°C.

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