An irradiation-resistant polypropylene masterbatch and its preparation method

Abstract

The present invention discloses a radiation-resistant polypropylene masterbatch and a preparation method thereof, belonging to the technical field of polypropylene functional masterbatches. The radiation-resistant polypropylene masterbatch, by weight, 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 polypropylene masterbatch prepared by the present invention has excellent aging resistance and radiation resistance, and also has excellent mechanical properties and heat resistance.

Description

Technical Field

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

[0002] Polypropylene is a thermoplastic polymer made from propylene monomers through a polyaddition reaction and is a widely used general-purpose polymer material. Polypropylene has a low density (0.89 - 0.91 g / cm 3 ) and has good mechanical properties and heat resistance, and also has excellent chemical stability and electrical insulation properties, and is widely used in various fields such as food packaging, building materials, automotive parts, textile and clothing. However, polypropylene has poor aging resistance and does not have flame retardancy. Among them, the poor aging resistance is specifically manifested in that polypropylene is easily aged by the action of ultraviolet rays, heat, and oxygen. To solve the above problems, the most commonly used method at present is to add various additives to polypropylene, such as antioxidants, light stabilizers, nucleating agents, flame retardants, etc. Commonly used antioxidants are phosphorus-based antioxidants and sulfur-based 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] Irradiation sterilization is to use electromagnetic waves (such as electron beams, X-rays, and γ-rays) generated by ionizing radiation to kill microorganisms on substances. At present, polypropylene materials used in medical and health and food packaging often need to be irradiated and sterilized. Irradiation sterilization rays can destroy the structure of biological macromolecules, thereby inhibiting or killing microorganisms. However, polypropylene has poor radiation resistance, and its mechanical properties will drop significantly after irradiation. To improve the radiation resistance of polypropylene, in addition to adding antioxidants and light stabilizers, functional inorganic materials with a reflection effect, such as titanium dioxide, barium sulfate, talcum powder, etc., will also be added. However, when preparing polypropylene products by adding the above additives to polypropylene, the following problems exist: the compatibility of inorganic nucleating agents and functional inorganic materials with a reflection effect with polypropylene is poor, and moreover, the dispersibility of inorganic nucleating agents and functional inorganic materials with a reflection effect in polypropylene is poor, easy to agglomerate, which will further affect the mechanical properties of polypropylene, and will also affect the heat resistance of polypropylene, and the metal hydroxide flame retardant also has a problem of poor dispersibility, further affecting the mechanical properties and heat resistance of polypropylene.

[0004] To address the above problems, the most common method is to perform surface modification on inorganic nucleating agents, functional inorganic materials with reflective effects, and flame retardants, thereby improving the compatibility between inorganic nucleating agents and functional inorganic materials with reflective effects and polypropylene, and enhancing the dispersibility of inorganic nucleating agents, functional inorganic materials with reflective effects, and flame retardants. However, there are the following problems with surface modification: First, surface modification mainly involves grafting through the reaction of coupling agents with the hydroxyl groups on the surfaces of inorganic nucleating agents, functional inorganic materials with reflective effects, and flame retardants. However, there is a problem of low grafting efficiency during grafting, resulting in an unclear surface modification effect, and there are still problems of poor compatibility and dispersibility after surface modification. Second, due to the agglomeration problems of inorganic nucleating agents, functional inorganic materials with reflective effects, and flame retardants, when the coupling agent is used for surface modification, it cannot fully contact the surfaces of inorganic nucleating agents, functional inorganic materials with reflective effects, and flame retardants, resulting in uneven surface modification effects, and further leading to problems of poor compatibility and dispersibility after surface modification.

[0005] Therefore, developing a preparation method for radiation-resistant polypropylene masterbatch that can reduce the reduction of the mechanical properties of polypropylene materials caused by irradiation while ensuring the mechanical properties, heat resistance, and flame retardancy of polypropylene masterbatch is an urgent problem to be solved currently. Summary of the Invention

[0006] In view of the deficiencies of 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, and also has excellent mechanical properties and heat resistance.

[0007] To solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0008] A radiation-resistant polypropylene masterbatch, by weight, includes: 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;

[0009] The polypropylene has a melt index of 35 g / 10 min at 230°C and 2.16 kg;

[0010] The antioxidant is one or a combination of tris(2,4-di-tert-butylphenyl) phosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, and pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate];

[0011] The trade name of tris(2,4-di-tert-butylphenyl) phosphite is antioxidant 168;

[0012] The trade name of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite is antioxidant 626;

[0013] The trade name of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] is antioxidant 1010;

[0014] The light stabilizer is one or a combination of organophosphorus compounds, hindered amine compounds, and phenol compounds;

[0015] The organophosphorus compounds are one or a combination of trioctyl phosphate, trilauryl phosphite, tridecyl phosphite, octyldiphenyl 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'-diisopropylidenediphenyl C12-15 alcohol phosphite, 4,4'-butylidenebis(6-tert-butyl-3-methylphenol), 4,4'-butylidenebis(3-methyl-6-tert-butylphenyl)-tetrakis(tridecyl) diphosphite, tris(2,4-di-tert-butylphenyl) phosphite, triethyl phosphite, triphenyl phosphite, 4,4'-butylidenebis(6-tert-butyl-3-methylphenol), diphenylisodecyl phosphite, isopropyltriphenyl phosphate, and tetrakis(2,4-di-tert-butylphenol)-4,4'-biphenyldiphosphite;

[0016] The hindered amine compounds are one or a combination of 2,2,6,6-tetramethylpiperidine derivatives and 1,2,2,6,6-pentamethylpiperidine derivatives;

[0017] The 2,2,6,6 - tetramethylpiperidine derivative is one or a combination of benzoic acid (2,2,6,6 - tetramethyl - 4 - hydroxypiperidine) ester, bis(2,2,6,6 - tetramethyl - 4 - hydroxypiperidine) sebacate, nitrilotri[acetic acid(2,2,6,6 - tetramethyl - 4 - hydroxypiperidine) ester], N,N’ - bis(2,2,6,6 - tetramethylpiperidinyl) hexanediamine, 2,2,6,6 - tetramethyl - 4 - piperidyl stearate, the reaction product polymer of N,N'-bis(2,2,6,6 - tetramethyl - 4 - piperidyl)-1,6 - hexanediamine with 2,4,6 - trichloro - 1,3,5 - triazine, N - butyl - 1 - butylamine and N - butyl - 2,2,6,6 - tetramethyl - 4 - piperidineamine, the reaction product of the polymer of N,N’ - bis-(2,2,6,6 - tetramethyl - 4 - piperidyl)-1,6 - hexanediamine and 2,4,6 - trichloro - 1,3,5 - triazine with 1,1,3,3 - tetramethylbutylamine, poly-{[6-[(1,1,3,3 - tetramethylbutyl)-amino]1,3,5,-triazine - 2,4 - diyl][(2,2,6,6 - tetramethylpiperidyl)-imino]-1,6 - hexanediyl-[(2,2,6,6 - tetramethylpiperidyl)-imino]}, and poly(4 - hydroxy - 2,2,6,6 - tetramethyl - 1 - piperidineethanol) succinate;

[0018] The trade name of the reaction product polymer of N,N'-bis(2,2,6,6 - tetramethyl - 4 - piperidyl)-1,6 - hexanediamine with 2,4,6 - trichloro - 1,3,5 - triazine, N - butyl - 1 - butylamine and N - butyl - 2,2,6,6 - tetramethyl - 4 - piperidineamine is light stabilizer 2020;

[0019] The trade name of the reaction product of the polymer of N,N’ - bis-(2,2,6,6 - tetramethyl - 4 - piperidyl)-1,6 - hexanediamine and 2,4,6 - trichloro - 1,3,5 - triazine with 1,1,3,3 - tetramethylbutylamine is light stabilizer 944;

[0020] The trade name of the poly-{[6-[(1,1,3,3 - tetramethylbutyl)-amino]1,3,5,-triazine - 2,4 - diyl][(2,2,6,6 - tetramethylpiperidyl)-imino]-1,6 - hexanediyl-[(2,2,6,6 - tetramethylpiperidyl)-imino]} is light stabilizer 944;

[0021] The trade name of the poly(4 - hydroxy - 2,2,6,6 - tetramethyl - 1 - piperidineethanol) succinate is light stabilizer 622;

[0022] The 1,2,2,6,6-pentamethylpiperidine derivative is one or a combination of tris(1,2,2,6,6-pentamethyl-4-hydroxypiperidyl) phosphite, bis(1,2,2,6,6-pentamethyl-4-hydroxypiperidyl) sebacate, and bis(1,2,2,6,6-pentamethyl-4-hydroxypiperidyl) 2-ethyl-2-(4-hydroxy-3,5-di-tert-butylbenzyl) malonate;

[0023] 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;

[0024] The preparation method of the functional reflective particles is as follows: rutile titanium dioxide and 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 - 16):1, the ball milling speed is 300 - 350 rpm, and the time is 2 - 2.5 h. An aqueous calcium chloride solution is added, and ball milling is continued for 50 - 60 min. Then it is taken out from the ball mill and vacuum dried at 80 - 90 °C. Then it is added to the ball mill together with an aqueous sodium stearate solution for ball milling. The ball-to-material ratio in the ball milling is controlled to be (14 - 16):1, the ball milling speed is 300 - 350 rpm, and the time is 20 - 30 min. Then it is taken out from the ball mill and vacuum dried at 80 - 90 °C to obtain the reflective particles;

[0025] In the preparation of the functional reflective particles, the dosage ratio of rutile titanium dioxide, polyethylene glycol 400, aqueous calcium chloride solution, and aqueous sodium stearate solution is (200 - 210) g:(32 - 35) g:(170 - 190) mL:(200 - 230) mL;

[0026] The average particle size of the rutile titanium dioxide is 300 nm;

[0027] The concentration of the aqueous calcium chloride solution is 10 wt%;

[0028] The concentration of the aqueous sodium stearate solution is 5 wt%.

[0029] The preparation method of the flame retardant is as follows: a hydrotalcite synergist and an aqueous zinc chloride solution are added to a ball mill for ball milling. The ball-to-material ratio in the ball milling is controlled to be 14 - 16:1, the ball milling speed is 300 - 350 rpm, and the time is 30 - 40 min. An aqueous polyethyleneimine solution is added, and ball milling is continued for 1.5 - 2 h. Then it is taken out from the ball mill and vacuum dried at 80 - 90 °C to obtain the flame retardant;

[0030] In the preparation of the flame retardant, the dosage ratio of the hydrotalcite synergist, zinc chloride aqueous solution, and polyethyleneimine aqueous solution is (470 - 500) g : (200 - 250) mL : (200 - 230) mL;

[0031] The concentration of the zinc chloride aqueous solution is 10 wt%;

[0032] The concentration of the polyethyleneimine aqueous solution is 5 wt%;

[0033] The molecular weight of the polyethyleneimine in the polyethyleneimine aqueous solution is 10,000;

[0034] The hydrotalcite synergist is hydrotalcite DHT - 4A;

[0035] The nucleating agent is nucleating agent NA - 11;

[0036] The lubricant is one or a combination of polyethylene wax and pentaerythritol stearate;

[0037] The coupling agent is vinyltriethoxysilane;

[0038] 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.

[0039] A method for preparing the aforementioned radiation - resistant polypropylene masterbatch, 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 them into a twin - screw extruder for melt extrusion and pelletizing to obtain the radiation - resistant polypropylene masterbatch;

[0040] In the melt extrusion, the rotational speed of the twin - screw extruder is 400 - 450 rpm, and the processing temperatures are: 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.

[0041] Compared with the prior art, the beneficial effects of the present invention are:

[0042] (1) The radiation-resistant polypropylene masterbatch of the present invention uses functional reflective particles. When preparing the functional reflective ions, first, rutile titanium dioxide is combined with polyethylene glycol 400, and polyethylene glycol 400 is adsorbed on the surface of rutile titanium dioxide to improve the dispersibility and the number of surface functional groups of rutile titanium dioxide. Then, it is mixed with an aqueous calcium chloride solution. Calcium chloride combines with polyethylene glycol 400 through chelation, and calcium ions are adsorbed on the outer layer. Finally, it is combined with an aqueous sodium stearate solution, and sodium stearate is adsorbed on the outer layer through the interaction with calcium ions. The introduction of sodium stearate can improve the dispersibility of the reflective particles and the compatibility with polypropylene. After sodium stearate combines with calcium ions, it can also act as a nucleating agent, a halogen absorber, and a 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, first, hydrotalcite DHT-4A is mixed with an aqueous zinc chloride solution, and zinc chloride is adsorbed on the surface and between the layers of hydrotalcite DHT-4A. Then, it is mixed with polyethyleneimine, and polyethyleneimine is adsorbed on the surface and between the layers of hydrotalcite DHT-4A through the action with zinc ions, thereby improving the dispersibility of hydrotalcite DHT-4A and the compatibility with polypropylene;

[0043] (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;

[0044] (3) The surface resistivity of the non-woven fabric prepared from the radiation-resistant polypropylene masterbatch of the present invention is 0.9×10 9 -2.5×10 9 Ω;

[0045] (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 such that the longitudinal strength is 36.87 - 39.80 N / 5 cm, and the transverse strength is 17.38 - 18.84 N / 5 cm;

[0046] (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%;

[0047] (6) The color fastness of the non-woven fabric prepared from the radiation-resistant polypropylene masterbatch of the present invention is 5 grades;

[0048] (7) The radiation-resistant polypropylene masterbatch of the present invention has excellent heat resistance. The heat distortion temperature of the non-woven fabric prepared from the radiation-resistant polypropylene masterbatch of the present invention is 113 - 121 °C;

[0049] (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 standing at -20°C for 30 days, the longitudinal strength reduction rate is 3.15 - 3.38%, and the transverse strength reduction rate is 3.00 - 3.14%.

[0050] (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 reduction rate is 2.08 - 2.48%, and the transverse strength reduction 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 reduction rate is 2.30 - 2.64%, and the transverse strength reduction 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 an electron beam with an irradiation dose of 50 KGy, the longitudinal strength reduction rate is 3.23 - 3.50%, and the transverse strength reduction rate is 2.97 - 3.43%. Specific Embodiments

[0051] In order to have a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention are now described.

[0052] Example 1

[0053] A radiation-resistant polypropylene masterbatch, by weight, includes: 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 part of nucleating agent, 0.5 part of lubricant, 1.7 parts of coupling agent, and 3.8 parts of pigment;

[0054] The polypropylene has a melt index of 35 g / 10 min at 230°C and 2.16 kg;

[0055] The antioxidant is tris(2,4-di-tert-butylphenyl) phosphite;

[0056] The trade name of the tris(2,4-di-tert-butylphenyl) phosphite is antioxidant 168;

[0057] The light stabilizer is an organophosphorus compound, specifically trioctyl phosphate;

[0058] The preparation method of the functional reflective particles is as follows: Add 200 g of rutile titanium dioxide and 32 g of polyethylene glycol 400 into a ball mill for ball milling. Control the ball-to-material ratio in the ball mill to be 14:1, the ball milling speed to be 300 rpm, and the time to be 2 h. Then add 170 mL of calcium chloride aqueous solution, continue ball milling for 50 min, take it out from the ball mill, and vacuum dry it at 80 °C. Then add it to 200 mL of sodium stearate aqueous solution in the ball mill for ball milling. Control the ball-to-material ratio in the ball mill to be 14:1, the ball milling speed to be 300 rpm, and the time to be 20 min. Take it out from the ball mill and vacuum dry it at 80 °C to obtain the reflective particles;

[0059] The average particle size of the rutile titanium dioxide is 300 nm;

[0060] The concentration of the calcium chloride aqueous solution is 10 wt%;

[0061] The concentration of the sodium stearate aqueous solution is 5 wt%.

[0062] The preparation method of the flame retardant is as follows: Add 470 g of hydrotalcite synergist and 200 mL of zinc chloride aqueous solution into a ball mill for ball milling. Control the ball-to-material ratio in the ball mill to be 14:1, the ball milling speed to be 300 rpm, and the time to be 30 min. Then add 200 mL of polyethyleneimine aqueous solution, continue ball milling for 1.5 h, take it out from the ball mill, and vacuum dry it at 80 °C to obtain the flame retardant;

[0063] The concentration of the zinc chloride aqueous solution is 10 wt%;

[0064] The concentration of the polyethyleneimine aqueous solution is 5 wt%;

[0065] The molecular weight of the polyethyleneimine in the polyethyleneimine aqueous solution is 10,000;

[0066] The hydrotalcite synergist is hydrotalcite DHT-4A;

[0067] The nucleating agent is nucleating agent NA-11;

[0068] The lubricant is polyethylene wax;

[0069] The coupling agent is vinyltriethoxysilane;

[0070] The pigment is pigment red 48:2;

[0071] The 48 in the pigment red 48:2 is the pigment number, and the 2 is the variant number of the pigment;

[0072] A preparation method of the aforementioned radiation-resistant polypropylene masterbatch, specifically: 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 them into a twin-screw extruder for melt extrusion and pelletizing to obtain the radiation-resistant polypropylene masterbatch;

[0073] In the melt extrusion, the rotation speed of the twin-screw extruder is 400 rpm, and the processing temperature is: the temperature of the first zone is 180 °C, the temperature of the second zone is 190 °C, the temperature of the third zone is 200 °C, the temperature of the fourth zone is 195 °C, and the temperature of the fifth zone is 190 °C.

[0074] Example 2

[0075] Replace the light stabilizer tris(2-ethylhexyl) phosphate in Example 1 with trilauryl phosphite in organophosphorus compounds in equal mass, and the rest of the technical solutions remain unchanged;

[0076] Example 3

[0077] Replace the light stabilizer tris(2-ethylhexyl) phosphate in Example 1 with tridecyl phosphite in organophosphorus compounds in equal mass, and the rest of the technical solutions remain unchanged;

[0078] Example 4

[0079] Replace the light stabilizer tris(2-ethylhexyl) phosphate in Example 1 with dioctyl phenyl phosphite in organophosphorus compounds in equal mass, and the rest of the technical solutions remain unchanged;

[0080] Example 5

[0081] Replace the light stabilizer tris(2-ethylhexyl) phosphate in Example 1 with tris(2-phenylphenyl) phosphite in organophosphorus compounds in equal mass, and the rest of the technical solutions remain unchanged;

[0082] Example 6

[0083] Replace the light stabilizer tris(2-ethylhexyl) phosphate in Example 1 with 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl) butane in organophosphorus compounds in equal mass, and the rest of the technical solutions remain unchanged;

[0084] Example 7

[0085] Replace the light stabilizer tris(2-ethylhexyl) phosphate in Example 1 with tris(2,4-di-tert-butylphenyl) phosphite in organophosphorus compounds in equal mass, and the rest of the technical solutions remain unchanged;

[0086] Example 8

[0087] Replace the light stabilizer tris(2-ethylhexyl) phosphate in Example 1 with 4,4'-diisopropyl diphenyl C12-15 alcohol phosphite in organophosphorus compounds in equal mass, and the rest of the technical solutions remain unchanged;

[0088] Example 9

[0089] Replace the same mass of the light stabilizer trioctyl phosphate in Example 1 with 4,4'-butylidenebis(6-tert-butyl-3-methylphenol) in organophosphorus compounds, and keep the rest of the technical solutions unchanged;

[0090] Example 10

[0091] Replace the same mass of the light stabilizer trioctyl phosphate in Example 1 with tetra(tridecyl)-4,4'-butylidenebis(3-methyl-6-tert-butylphenyl) diphosphite in organophosphorus compounds, and keep the rest of the technical solutions unchanged;

[0092] Example 11

[0093] Replace the same mass of the light stabilizer trioctyl phosphate in Example 1 with tris(2,4-di-tert-butylphenyl) phosphite in organophosphorus compounds, and keep the rest of the technical solutions unchanged;

[0094] Example 12

[0095] Replace the same mass of the light stabilizer trioctyl phosphate in Example 1 with triethyl phosphite in organophosphorus compounds, and keep the rest of the technical solutions unchanged;

[0096] Example 13

[0097] Replace the same mass of the light stabilizer trioctyl phosphate in Example 1 with triphenyl phosphite in organophosphorus compounds, and keep the rest of the technical solutions unchanged;

[0098] Example 14

[0099] Replace the same mass of the light stabilizer trioctyl phosphate in Example 1 with 4,4'-butylidenebis(6-tert-butyl-3-methylphenol) in organophosphorus compounds, and keep the rest of the technical solutions unchanged;

[0100] Example 15

[0101] Replace the same mass of the light stabilizer trioctyl phosphate in Example 1 with diphenylisodecyl phosphite in organophosphorus compounds, and keep the rest of the technical solutions unchanged;

[0102] Example 16

[0103] Replace the same mass of the light stabilizer trioctyl phosphate in Example 1 with isopropyltriphenyl phosphate in organophosphorus compounds, and keep the rest of the technical solutions unchanged;

[0104] Example 17

[0105] Replace the same mass of the light stabilizer trioctyl phosphate in Example 1 with tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenyldiphosphite in the organophosphorus compound, and keep the rest of the technical solutions unchanged;

[0106] Example 18

[0107] An irradiation-resistant polypropylene masterbatch, by weight, includes: 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 part of nucleating agent, 0.55 part of lubricant, 1.9 parts of coupling agent, and 4 parts of pigment;

[0108] The melt index of the polypropylene at 230°C and 2.16 kg is 35 g / 10 min;

[0109] The antioxidant is bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite;

[0110] The trade name of the bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite is antioxidant 626;

[0111] The light stabilizer is a hindered amine compound, specifically (2,2,6,6-tetramethyl-4-hydroxypiperidinyl) benzoate in 2,2,6,6-tetramethylpiperidine derivatives;

[0112] The preparation method of the functional reflective particles is as follows: Add 205 g of rutile titanium dioxide and 34 g of polyethylene glycol 400 into a ball mill for ball milling. Control the ball-to-material ratio in the ball mill to be 15:1, the ball milling speed to be 320 rpm, and the time to be 2.5 h. Add 180 mL of calcium chloride aqueous solution, continue ball milling for 55 min, take it out from the ball mill, and vacuum dry it at 85°C. Then add it to 220 mL of sodium stearate aqueous solution in the ball mill for ball milling. Control the ball-to-material ratio in the ball mill to be 15:1, the ball milling speed to be 320 rpm, and the time to be 25 min. Take it out from the ball mill and vacuum dry it at 85°C to obtain reflective particles;

[0113] The average particle size of the rutile titanium dioxide is 300 nm;

[0114] The concentration of the calcium chloride aqueous solution is 10 wt%;

[0115] The concentration of the sodium stearate aqueous solution is 5 wt%.

[0116] The preparation method of the flame retardant is as follows: Add 480 g of hydrotalcite synergist and 220 mL of zinc chloride aqueous solution into a ball mill for ball milling. Control the ball-to-material ratio in the ball mill to be 15:1, the ball milling speed to be 320 rpm, and the time to be 35 min. Then add 220 mL of polyethyleneimine aqueous solution and continue ball milling for 1.5 h. Take it out from the ball mill and vacuum dry it at 85 °C to obtain the flame retardant;

[0117] The concentration of the zinc chloride aqueous solution is 10 wt%;

[0118] The concentration of the polyethyleneimine aqueous solution is 5 wt%;

[0119] The molecular weight of polyethyleneimine in the polyethyleneimine aqueous solution is 10,000;

[0120] The hydrotalcite synergist is hydrotalcite DHT-4A;

[0121] The nucleating agent is nucleating agent NA-11;

[0122] The lubricant is polyethylene wax;

[0123] The coupling agent is vinyltriethoxysilane;

[0124] The pigment is pigment yellow 191;

[0125] The 191 in the pigment yellow 191 is the pigment number;

[0126] A preparation method of the aforementioned radiation-resistant polypropylene masterbatch is as follows: Add 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 add them into a twin-screw extruder for melt extrusion and pelletizing to obtain the radiation-resistant polypropylene masterbatch;

[0127] In the melt extrusion, the rotation speed of the twin-screw extruder 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.

[0128] Example 19

[0129] Replace the light stabilizer benzoic acid (2,2,6,6-tetramethyl-4-hydroxypiperidine) ester in Example 20 with sebacic acid bis(2,2,6,6-tetramethyl-4-hydroxypiperidine) ester in the hindered amine compound in equal mass, and keep the rest of the technical solutions unchanged.

[0130] Example 20

[0131] Replace the light stabilizer benzoic acid (2,2,6,6 - tetramethyl - 4 - hydroxypiperidine) ester in Example 20 with tris[acetic acid (2,2,6,6 - tetramethyl - 4 - hydroxypiperidine) ester] of the hindered amine compound in equal mass, and keep the rest of the technical solutions unchanged.

[0132] Example 21

[0133] Replace the light stabilizer benzoic acid (2,2,6,6 - tetramethyl - 4 - hydroxypiperidine) ester in Example 20 with N,N’ - bis(2,2,6,6 - tetramethylpiperidinyl)hexanediamine of the hindered amine compound in equal mass, and keep the rest of the technical solutions unchanged.

[0134] Example 22

[0135] Replace the light stabilizer benzoic acid (2,2,6,6 - tetramethyl - 4 - hydroxypiperidine) ester in Example 20 with 2,2,6,6 - tetramethyl - 4 - piperidyl stearate of the hindered amine compound in equal mass, and keep the rest of the technical solutions unchanged.

[0136] Example 23

[0137] Replace the light stabilizer benzoic acid (2,2,6,6 - tetramethyl - 4 - hydroxypiperidine) ester in Example 20 with the polymer of the reaction product of N,N'-bis(2,2,6,6 - tetramethyl - 4 - piperidyl)-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 - piperidineamine in equal mass, and keep the rest of the technical solutions unchanged;

[0138] The trade name of the polymer of the reaction product of N,N'-bis(2,2,6,6 - tetramethyl - 4 - piperidyl)-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 - piperidineamine is light stabilizer 2020.

[0139] Example 24

[0140] Replace the light stabilizer benzoic acid (2,2,6,6 - tetramethyl - 4 - hydroxypiperidine) ester in Example 20 with the reaction product of the polymer of N,N’ - bis-(2,2,6,6 - tetramethyl - 4 - piperidyl)-1,6 - hexanediamine with 2,4,6 - trichloro - 1,3,5 - triazine and 1,1,3,3 - tetramethylbutylamine in equal mass, and keep the rest of the technical solutions unchanged;

[0141] The reaction product of the polymer of N,N'-bis-(2,2,6,6-tetramethyl-4-piperidyl)-1,6-hexanediamine and 2,4,6-trichloro-1,3,5-triazine and 1,1,3,3-tetramethylbutylamine has the trade name of light stabilizer 944.

[0142] Example 25

[0143] Replace the light stabilizer benzoic acid (2,2,6,6-tetramethyl-4-hydroxypiperidyl) ester in Example 20 with poly-{[6-[(1,1,3,3-tetramethylbutyl)-amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethylpiperidyl)-imino]-1,6-hexanediyl-[(2,2,6,6-tetramethylpiperidyl)-imino]} in the hindered amine compound in equal mass, and keep the rest of the technical solutions unchanged;

[0144] The trade name of the poly-{[6-[(1,1,3,3-tetramethylbutyl)-amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethylpiperidyl)-imino]-1,6-hexanediyl-[(2,2,6,6-tetramethylpiperidyl)-imino]} is light stabilizer 944.

[0145] Example 26

[0146] Replace the light stabilizer benzoic acid (2,2,6,6-tetramethyl-4-hydroxypiperidyl) ester in Example 20 with poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidylethyl) succinate in the hindered amine compound in equal mass, and keep the rest of the technical solutions unchanged;

[0147] The trade name of the poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidylethyl) succinate is light stabilizer 622.

[0148] Example 27

[0149] An irradiation-resistant polypropylene masterbatch, by weight, comprises: 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 part of nucleating agent, 0.58 part of lubricant, 1.8 parts of coupling agent, 4.1 parts of pigment;

[0150] The melt index of the polypropylene at 230 °C and 2.16 kg is 35 g / 10 min;

[0151] The antioxidant is pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate];

[0152] The trade name of the above-mentioned pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] is antioxidant 1010;

[0153] The light stabilizer is a hindered amine compound, specifically tris(1,2,2,6,6-pentamethyl-4-hydroxypiperidyl) phosphite in 1,2,2,6,6-pentamethylpiperidine derivatives; The preparation method of the functional reflective particles is as follows: Add 208 g of rutile titanium dioxide and 34 g of polyethylene glycol 400 into a ball mill for ball milling, control the ball-to-material ratio in the ball mill to be 15:1, the ball milling speed to be 350 rpm, and the time to be 2 h. Then add 180 mL of calcium chloride aqueous solution, continue ball milling for 55 min, take it out from the ball mill, and vacuum dry it at 90 °C. Then add it to 220 mL of sodium stearate aqueous solution in the ball mill for ball milling, control the ball-to-material ratio in the ball mill to be 15:1, the ball milling speed to be 320 rpm, and the time to be 27 min. Take it out from the ball mill and vacuum dry it at 90 °C to obtain reflective particles;

[0154] The average particle size of the rutile titanium dioxide is 300 nm;

[0155] The concentration of the calcium chloride aqueous solution is 10 wt%;

[0156] The concentration of the sodium stearate aqueous solution is 5 wt%.

[0157] The preparation method of the flame retardant is as follows: Add 480 g of hydrotalcite synergist and 240 mL of zinc chloride aqueous solution into a ball mill for ball milling, control the ball-to-material ratio in the ball mill to be 15:1, the ball milling speed to be 350 rpm, and the time to be 40 min. Then add 220 mL of polyethyleneimine aqueous solution, continue ball milling for 2 h, take it out from the ball mill, and vacuum dry it at 90 °C to obtain the flame retardant;

[0158] The concentration of the zinc chloride aqueous solution is 10 wt%;

[0159] The concentration of the polyethyleneimine aqueous solution is 5 wt%;

[0160] The molecular weight of polyethyleneimine in the polyethyleneimine aqueous solution is 10,000;

[0161] The hydrotalcite synergist is hydrotalcite DHT-4A;

[0162] The nucleating agent is nucleating agent NA-11;

[0163] The lubricant is pentaerythritol stearate;

[0164] The coupling agent is vinyltriethoxysilane;

[0165] The pigment is pigment black 7;

[0166] The "7" in Pigment Black 7 is the pigment number;

[0167] A method for preparing the aforementioned radiation-resistant polypropylene masterbatch, specifically: adding polypropylene, a light stabilizer, a flame retardant, reflective particles, a hydrotalcite synergist, a nucleating agent, a plasticizer, a coupling agent, and a pigment into a high-speed mixer for high-speed mixing, and then adding them into a twin-screw extruder for melt extrusion and pelletizing to obtain the radiation-resistant polypropylene masterbatch;

[0168] In the melt extrusion, the rotation speed of the twin-screw extruder is 450 rpm, and the processing temperatures are: 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.

[0169] Example 28

[0170] Replace tris(1,2,2,6,6-pentamethyl-4-hydroxypiperidinyl) phosphite as the light stabilizer in Example 25 with bis(1,2,2,6,6-pentamethyl-4-hydroxypiperidinyl) sebacate in the hindered amine compound in equal mass, and keep the rest of the technical solutions unchanged.

[0171] Example 29

[0172] Replace tris(1,2,2,6,6-pentamethyl-4-hydroxypiperidinyl) phosphite as the light stabilizer in Example 25 with bis(1,2,2,6,6-pentamethyl-4-hydroxypiperidinyl) 2-ethyl-2-(4-hydroxy-3,5-di-tert-butylbenzyl) malonate in the hindered amine compound in equal mass, and keep the rest of the technical solutions unchanged.

[0173] Example 30

[0174] A radiation-resistant polypropylene masterbatch, by weight, includes: 90 parts of polypropylene, 15 parts of an antioxidant, 15 parts of a light stabilizer, 8 parts of functional reflective particles, 6 parts of a flame retardant, 0.3 part of a nucleating agent, 0.6 part of a lubricant, 2 parts of a coupling agent, and 4.2 parts of a pigment;

[0175] The melt index of the polypropylene at 230 °C and 2.16 kg is 35 g / 10 min;

[0176] The antioxidant is tris(2,4-di-tert-butylphenyl) phosphite;

[0177] The trade name of tris(2,4-di-tert-butylphenyl) phosphite is Antioxidant 168;

[0178] The light stabilizer is a phenol compound, specifically 2,6-di-tert-butyl-p-cresol;

[0179] The preparation method of the functional reflective particles is as follows: Add 210 g of rutile titanium dioxide and 35 g of polyethylene glycol 400 into a ball mill for ball milling. Control the ball-to-material ratio in the ball mill to be 16:1, the ball milling speed to be 350 rpm, and the time to be 2.5 h. Add 190 mL of calcium chloride aqueous solution, continue ball milling for 60 min, take it out from the ball mill, and vacuum dry it at 90 °C. Then add it to 230 mL of sodium stearate aqueous solution in the ball mill for ball milling. Control the ball-to-material ratio in the ball mill to be 16:1, the ball milling speed to be 350 rpm, and the time to be 30 min. Take it out from the ball mill and vacuum dry it at 90 °C to obtain the reflective particles;

[0180] The average particle size of the rutile titanium dioxide is 300 nm;

[0181] The concentration of the calcium chloride aqueous solution is 10 wt%;

[0182] The concentration of the sodium stearate aqueous solution is 5 wt%.

[0183] The preparation method of the flame retardant is as follows: Add 500 g of hydrotalcite synergist and 250 mL of zinc chloride aqueous solution into a ball mill for ball milling. Control the ball-to-material ratio in the ball mill to be 16:1, the ball milling speed to be 350 rpm, and the time to be 40 min. Add 230 mL of polyethyleneimine aqueous solution, continue ball milling for 2 h, take it out from the ball mill, and vacuum dry it at 90 °C to obtain the flame retardant;

[0184] The concentration of the zinc chloride aqueous solution is 10 wt%;

[0185] The concentration of the polyethyleneimine aqueous solution is 5 wt%;

[0186] The molecular weight of polyethyleneimine in the polyethyleneimine aqueous solution is 10000;

[0187] The hydrotalcite synergist is hydrotalcite DHT-4A;

[0188] The nucleating agent is nucleating agent NA-11;

[0189] The lubricant is pentaerythritol stearate;

[0190] The coupling agent is vinyltriethoxysilane;

[0191] The pigment is pigment violet 23;

[0192] The 23 in the pigment violet 23 is the pigment number;

[0193] A preparation method of the aforementioned radiation-resistant polypropylene masterbatch, specifically: 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 them into a twin-screw extruder for melt extrusion and pelletizing to obtain the radiation-resistant polypropylene masterbatch;

[0194] In the melt extrusion, the rotation speed of the twin-screw extruder 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.

[0195] Example 31

[0196] Replace 2,6-di-tert-butyl-p-cresol, the light stabilizer in Example 29, with propyl gallate in the hindered amine compound in equal mass, and replace pigment violet 23 with pigment blue 15:3 in equal mass, and keep the rest of the technical solutions unchanged;

[0197] In the pigment blue 15:3, 15 is the pigment number and 3 is the variant number of the pigment.

[0198] Example 32

[0199] Replace 2,6-di-tert-butyl-p-cresol, the light stabilizer in Example 29, with 6-tert-butyl-m-cresol in the hindered amine compound in equal mass, and replace pigment violet 23 with pigment blue 15:3 in equal mass, and keep the rest of the technical solutions unchanged;

[0200] In the pigment blue 15:3, 15 is the pigment number and 3 is the variant number of the pigment.

[0201] Example 33

[0202] Replace 2,6-di-tert-butyl-p-cresol, the light stabilizer in Example 29, with 6-tert-butyl-2,4-dimethylphenol in the hindered amine compound in equal mass, and replace pigment violet 23 with pigment green 7 in equal mass, and keep the rest of the technical solutions unchanged;

[0203] In the pigment green 7, 7 is the pigment number.

[0204] Example 34

[0205] Replace 2,6-di-tert-butyl-p-cresol, the light stabilizer in Example 29, with 2,6-di-tert-butyl-4-methylphenol in the hindered amine compound in equal mass, and replace pigment violet 23 with pigment green 7 in equal mass, and keep the rest of the technical solutions unchanged;

[0206] In the pigment green 7, 7 is the pigment number.

[0207] Comparative Example 1

[0208] 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 in equal mass, and the rest of the technical solutions remain unchanged.

[0209] Comparative Example 2

[0210] On the basis of the technical solution of Example 1, in the composition of the radiation-resistant polypropylene masterbatch, hydrotalcite DHT-4A is used to replace the flame retardant in equal mass, and the rest of the technical solutions remain unchanged.

[0211] Performance Test 1

[0212] The melt index and filtration performance of the radiation-resistant polypropylene masterbatches 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:

[0213]

[0214] Considering that the differences between Example 1 and Examples 2-17, Example 18 and Examples 19-26, Example 27 and Examples 28-29, Example 30 and Examples 31-34 are only in 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 Examples 2-17, Example 18 and Examples 19-26, Example 27 and Examples 28-29, Example 30 and Examples 31-34 are not very different. Therefore, the melt index and filtration performance of Examples 2-17, Examples 19-26, Examples 28-29, and Examples 31-34 were sorted out respectively, and their ranges are as follows:

[0215]

[0216] Performance Test 2

[0217] The radiation-resistant polypropylene masterbatches prepared in Examples 1-34 and Comparative Examples 1-2 were respectively mixed with polypropylene in a high-speed mixer at a mass ratio of 5:95 for high-speed mixing, then melt-extruded in a twin-screw extruder, then filtered through a melt filter, spun in a spinning machine, subjected to air stretching, formed on a forming curtain, and hot-rolled in a hot-rolling machine to obtain polypropylene non-woven fabric;

[0218] The temperature during the melt extrusion is 210 °C;

[0219] The temperature during the spinning is 250 °C;

[0220] The temperature during the hot rolling is 190 °C, and the pressure is 20 MPa.

[0221] Then, the surface resistivity, longitudinal strength, transverse strength, limiting oxygen index, color fastness, and heat distortion temperature of the polypropylene non-woven fabrics prepared from the radiation-resistant polypropylene masterbatches 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:

[0222]

[0223] The polypropylene non-woven fabric was placed at -20°C and left standing for 30 days, and then the transverse strength and longitudinal strength were tested, and the transverse strength decrease rate and longitudinal strength decrease rate were calculated. The calculation results are as follows:

[0224]

[0225] The polypropylene non-woven fabric was irradiated with X-rays at an irradiation dose of 50 kGy, and then the transverse strength and longitudinal strength were tested, and the transverse strength decrease rate and longitudinal strength decrease rate were calculated. The calculation results are as follows:

[0226]

[0227] The polypropylene non-woven fabric was irradiated with γ-rays at an irradiation dose of 50 kGy, and then the transverse strength and longitudinal strength were tested, and the transverse strength decrease rate and longitudinal strength decrease rate were calculated. The calculation results are as follows:

[0228]

[0229] The polypropylene non-woven fabric was irradiated with an electron beam at an irradiation dose of 50 kGy, and then the transverse strength and longitudinal strength were tested, and the transverse strength decrease rate and longitudinal strength decrease rate were calculated. The calculation results are as follows:

[0230]

[0231] Considering that the differences between Example 1 and Examples 2-17, Example 18 and Examples 19-26, Example 27 and Examples 28-29, Example 30 and Examples 31-34 are only in the light stabilizer, or the light stabilizer and the pigment, and the light stabilizers used belong to the same category, therefore, the differences in performance indicators between Example 1 and Examples 2-17, Example 18 and Examples 19-26, Example 27 and Examples 28-29, Example 30 and Examples 31-34 are not significant. Therefore, the surface resistivity, longitudinal strength, transverse strength, limiting oxygen index, color fastness, heat distortion temperature, strength reduction rate after standing at -20°C for 30 days, strength reduction rate after irradiation with X-rays at a radiation dose of 50 KGy, strength reduction rate after irradiation with γ-rays at an irradiation dose of 50 KGy, and strength reduction rate after irradiation with electron beams at an irradiation dose of 50 KGy of Examples 2-17, Examples 19-26, Examples 28-29, and Examples 31-34 were sorted out respectively, and their ranges were taken. The results are as follows:

[0232]

[0233] Unless otherwise specified, the percentages used in the present invention are all mass percentages.

[0234] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within 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; The hydrotalcite synergist is hydrotalcite DHT-4A.

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 one or a combination of trioctyl phosphate, trilauryl phosphite, tridecyl phosphite, octyl diphenyl phosphite, tris(2-phenylphenyl)phosphite, tris(2,4-di-tert-butylphenyl)phosphite, 4,4'-isopropyl diphenyl C12-15-ol phosphite, 4,4'-butylene bis-(3-methyl-6-tert-butylphenyl)-tetra(tridecyl) diphosphite, triethyl phosphite, triphenyl phosphite, diphenyl isodecyl phosphite, isopropylated triphenyl phosphate, and tetrakis(2,4-di-tert-butylphenol)-4,4'-biphenyl diphosphite.

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-hydroxypiperidine) ester, sebacate bis (2,2,6,6-tetramethyl-4-hydroxypiperidine) ester, nitrogen tris [acetic acid (2,2,6,6-tetramethyl-4-hydroxypiperidine) 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-hexane One or a combination of a polymer of a diamine and a reaction product of 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 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, and poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinethanol) succinate; 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 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.

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