Deodorizing and brightening functional color master batch for PCR plastic and preparation method thereof

Abstract

This application relates to the field of color masterbatch processing technology, and more specifically, to a deodorizing and brightening functional color masterbatch for PCR plastics and its preparation method, comprising the following raw materials in parts by weight: 30-50 parts of carrier resin, 10-20 parts of composite deodorizer, 3-8 parts of epoxy-functionalized styrene-acrylate oligomer, 3-8 parts of compatibilizer, 2-5 parts of lubricant, and 0.5-1.5 parts of antioxidant; wherein the epoxy-functionalized styrene-acrylate oligomer has a functionality of ≥4. The above formula effectively solves the problems of severe odor, poor surface gloss, and decreased mechanical properties of PCR plastics: the composite deodorizer adsorbs and removes residual odor molecules and volatile organic compounds (VOCs) generated by thermal degradation; and the epoxy-functionalized styrene-acrylate oligomer with a functionality of ≥4 repairs polymer molecular chains broken due to repeated recycling and processing, greatly improving the molecular weight and its distribution uniformity, and significantly enhancing the tensile strength and impact toughness of the product.

Description

Technical Field

[0001] This application relates to the field of color masterbatch processing technology, and more specifically, to a deodorizing and brightening functional color masterbatch for PCR plastics and its preparation method. Background Technology

[0002] Post-consumer recycled plastics (PCR plastics) are seeing a year-on-year increase in their application in areas such as daily chemical packaging, appliance casings, and automotive interiors due to their significant carbon reduction benefits. Statistics show that replacing virgin plastics with PCR plastics can reduce carbon emissions by approximately 60-80%, leading to an explosive growth in market demand for PCR plastics.

[0003] However, compared to virgin plastics, PCR plastics have undergone prolonged outdoor use and photothermal aging before recycling, and have been subjected to multiple high-temperature shearing and melting processes during recycling and granulation, leading to irreversible degradation of their molecular structure. Specifically, PCR plastics have the following two problems: The odor is severe. Before recycling, PCR plastics are in prolonged contact with various daily chemical products, food, or industrial chemicals. Odor molecules from the original packaging contents are adsorbed and remain in their micropores. Simultaneously, during repeated thermomechanical degradation, the polymer undergoes oxidative chain scission, producing large amounts of low-molecular-weight volatile organic compounds (VOCs), such as aldehydes, ketones, and carboxylic acids—irritating substances. These odor components combine to give PCR plastics a pungent or sour smell, severely limiting their application in high-end packaging and indoor products. Currently, the industry commonly uses fragrances to treat the odor, but this method only temporarily masks the odor and cannot fundamentally eliminate VOCs. Furthermore, fragrance molecules and residual odor substances are prone to complex chemical reactions under high-temperature processing conditions, producing even more difficult-to-remove mixed odors, resulting in the opposite of the intended treatment effect.

[0004] The surface finish is poor and mechanical properties are significantly reduced. Repeated thermomechanical processing causes severe chain breakage in the polymer molecular chains, resulting in a decrease in molecular weight and a widening of the molecular weight distribution. During injection molding or extrusion molding, low molecular weight oligomers easily migrate and precipitate onto the product surface. Simultaneously, the instability of melt viscosity exacerbates melt fracture, leading to a rough, dull surface and extremely poor gloss in the final product. Furthermore, chain breakage directly degrades the material's tensile strength, impact toughness, and other mechanical properties, making it difficult to meet the performance requirements of high-end applications.

[0005] In summary, current marketed masterbatch products have limited functionality, primarily focusing on coloring and only providing color mixing capabilities. They cannot simultaneously address the odor and surface gloss defects of PCR plastics. Existing technologies offer few solutions to these issues. Summary of the Invention

[0006] To address the issues of odor and surface gloss defects in PCR plastics, this application provides a deodorizing and brightening functional masterbatch for PCR plastics and its preparation method.

[0007] In a first aspect, this application provides a deodorizing and brightening functional masterbatch for PCR plastics, employing the following technical solution: A deodorizing and brightening functional masterbatch for PCR plastics is prepared from the following raw materials in parts by weight: 30-50 parts of carrier resin; 10-20 parts of compound deodorizer; 3-8 parts of epoxy-functionalized styrene-acrylate oligomer; 3-8 parts compatibilizer; 2-5 parts lubricant; Antioxidant 0.5-1.5 parts; The functionality of the epoxy-functionalized styrene-acrylate oligomer is ≥4.

[0008] By adopting the above technical solutions, the problems of severe odor, poor surface gloss, and decreased mechanical properties of PCR plastics are effectively solved: A composite deodorizer adsorbs and removes residual odor molecules and volatile organic compounds (VOCs) generated by thermal degradation, avoiding the secondary odor problem that may be caused by traditional fragrance masking methods; epoxy-functionalized styrene-acrylate oligomers with a functionality ≥4 repair polymer molecular chains broken by repeated recycling and processing, greatly improving molecular weight and its distribution uniformity, thereby improving melt flowability, inhibiting melt fracture, and significantly enhancing the tensile strength and impact toughness of the product; Simultaneously, the synergistic effect of compatibilizers and lubricants promotes the internal coating or uniform dispersion of low molecular weight oligomers, reducing surface precipitation, resulting in a smooth and flat surface with significantly improved gloss of the final product. This achieves a multi-functional integrated improvement of PCR plastics in deodorization, brightening, and mechanical property restoration, expanding its application prospects in high-end packaging and indoor products.

[0009] Preferably, the composite deodorizer is composed of amino-modified porous filler and zinc ricinoleate in a weight ratio of (5-10):2.

[0010] By adopting the above technical solution, efficient and deep removal of complex odor components in PCR plastics is achieved: Amino-modified porous filler utilizes its high specific surface area and microporous structure to physically adsorb macromolecular odor substances. At the same time, the amino functional groups on its surface can chemically bond or neutralize acidic or polar volatile organic compounds (VOCs) such as aldehydes and ketones, locking them firmly in the pores; Zinc ricinoleate, as a highly efficient metal soap deodorizer, specifically captures and neutralizes small molecule irritating odors such as carboxylic acids and sulfides generated during the recovery process. The two are compounded in a weight ratio of (5-10):2, which not only ensures sufficient physical adsorption capacity to cope with high concentration odor load, but also provides sufficient chemical active sites to eliminate unpleasant chemical odors, thereby overcoming the limitations of single deodorization methods.

[0011] Preferably, the composite deodorizer is prepared by the following method: The porous filler is baked and activated at 180-200℃ for 1-2 hours to remove moisture, then added to a high-speed mixer, sprayed with aminosilane coupling agent and mixed, and then zinc ricinoleate is added and mixed again to obtain a composite deodorizer.

[0012] Preferably, the amount of the aminosilane coupling agent is -512% of the weight of the porous filler.

[0013] By adopting the above technical solution, high-temperature activation removes moisture from the filler and exposes pores, thereby improving the physical adsorption capacity; aminosilane coupling agent is used to graft amino groups onto the surface of the filler to enhance the chemical capture of polar odor molecules; then zinc ricinoleate is uniformly loaded onto the porous filler to form a synergistic effect of physical adsorption and chemical adsorption, thereby improving the removal efficiency and persistence of complex VOCs in PCR plastics.

[0014] Preferably, the porous packing is a modified porous packing, prepared by the following method: 1) Immerse 40-50g of porous packing in 200ml of a mixed solution of cerium nitrate and zinc nitrate, sonicate, dry, heat to 350-400℃, and keep warm for 3-4h to obtain the supported CeO2 / ZnO porous packing. 2) Place 40-50g of CeO2 / ZnO porous filler in 200ml of deionized water, add 2-3g of emulsifier, sonicate, introduce nitrogen gas and heat to 70-75℃, add 36-52g of monomer mixture and 20ml of initiator solution dropwise. After the addition is complete, keep the reaction at the temperature for 3-4h, then heat to 80-85℃ for 1-2h, filter to remove gel particles, dry, and obtain the modified porous filler; The monomer mixture is obtained by preheating and stirring 10-15g of methacrylated β-cyclodextrin, 25-35g of butyl acrylate and 1-2g of emulsifier at 55-60℃. The initiator solution was obtained by dissolving potassium persulfate in deionized water, with a concentration of 0.025-0.05 g / mL; The cerium nitrate and zinc nitrate mixed solution is obtained by dissolving cerium nitrate and zinc nitrate in deionized water, wherein the concentration of cerium nitrate is 0.04-0.06 g / mL and the concentration of zinc nitrate is 0.02-0.03 g / mL.

[0015] By adopting the above technical solution, step 1) loads the porous filler with CeO2 / ZnO. The excellent redox catalytic activity of CeO2 / ZnO degrades adsorbed small-molecule VOCs such as aldehydes and ketones into harmless substances in situ, preventing desorption and release after adsorption saturation. In step S2, methacrylate-modified β-cyclodextrin and butyl acrylate copolymer are grafted onto the surface of the porous filler. The unique hydrophobic cavities of β-cyclodextrin specifically encapsulate large-molecule odor substances and residual fragrances, achieving deep deodorization. Simultaneously, the flexible segments of butyl acrylate significantly improve the interfacial compatibility between the inorganic rigid filler and the polymer matrix, effectively transferring stress and inhibiting microcrack propagation, thereby improving the tensile strength and impact toughness of the material. Furthermore, the core-shell structure formed by this process highly disperses the modified filler in the matrix, filling microscopic defects and reducing surface roughness, thus reducing light scattering and giving the product excellent surface gloss and dense texture, achieving a simultaneous improvement in deodorization performance, mechanical strength, and appearance brightness.

[0016] Preferably, the epoxy-functionalized styrene-acrylate oligomer is composed of low molecular weight epoxy-functionalized styrene-acrylate oligomer and medium molecular weight epoxy-functionalized styrene-acrylate oligomer in a weight ratio of 1:(3-5). The weight-average molecular weight of the low molecular weight epoxy-functionalized styrene-acrylate oligomer is 1000-3000. The weight average molecular weight of the medium molecular weight epoxy-functionalized styrene-acrylate oligomer is 5000-8000.

[0017] By employing the above technical solution, the low molecular weight component, with its high reactivity and multifunctionality, can rapidly penetrate into the PCR plastic matrix, preferentially reacting with the end groups of broken molecular chains to rapidly extend the chain and stabilize the melt viscosity. The medium molecular weight component provides a longer molecular chain backbone and appropriate functionality, forming an effective entangled network structure in the system, enhancing intermolecular interactions, and further improving the material's mechanical properties and surface gloss. The synergistic effect of the two components ensures both the efficiency and completeness of the chain extension reaction while also considering the mechanical strength and surface quality of the final product, enabling the PCR plastic to achieve both deodorization and improved gloss and mechanical properties.

[0018] Preferably, it also includes 10-30 parts of coloring pigment, wherein the coloring pigment includes at least one of titanium dioxide, carbon black and environmentally friendly color powder.

[0019] By adopting the above technical solutions and adding appropriate pigments, the products can have various colors, increasing their variety.

[0020] Preferably, the carrier resin is one of metallocene polyethylene or copolymer polypropylene.

[0021] By adopting the above technical solution, a good compatibility system can be formed with epoxy-functionalized styrene-acrylate oligomers, ensuring that functional components such as composite deodorizers and chain extenders are uniformly dispersed in the PCR plastic matrix. At the same time, this type of carrier resin itself has excellent flowability and gloss, which can effectively reduce melt viscosity fluctuations and surface defects during processing, and synergistically improve the surface gloss and mechanical properties of PCR plastic products.

[0022] Preferably, the compatibilizer is a maleic anhydride-grafted elastomer.

[0023] Preferably, the maleic anhydride-grafted elastomer includes at least one of MAH-g-POE, EVA-g-MAH, and SEBS-g-MAH.

[0024] By adopting the above technical solution, the anhydride groups on its molecular chain can chemically react with the polar end groups such as carboxyl and hydroxyl groups produced by the oxidative degradation of PCR plastics. At the same time, it forms an effective interfacial bridge with the epoxy-functionalized styrene-acrylate oligomer chain extender, enhancing the interfacial bonding force and compatibility between the functional components and the PCR matrix resin. In addition, the elastomer skeleton endows the system with good flexibility and impact resistance. While promoting the uniform dispersion of the composite deodorizer, it effectively compensates for the toughness loss caused by the molecular chain breakage of PCR plastics, and synergistically achieves multiple technical effects of brightening, deodorizing and toughening.

[0025] Preferably, the lubricant is composed of erucamide and N,N'-ethylenebis-stearamide.

[0026] Preferably, the weight ratio of erucamide to N,N'-ethylenebis-stearamide is 1:(1-5).

[0027] By adopting the above technical solutions, the color masterbatch is ensured to be uniformly dispersed in the PCR plastic matrix, reducing melt fracture and synergistically improving the surface gloss and processing stability of the product.

[0028] Secondly, this application provides a method for preparing a deodorizing and brightening functional masterbatch for PCR plastics, using the following technical solution: A method for preparing a deodorizing and brightening functional masterbatch for PCR plastics includes the following preparation steps: S1. Mix the carrier resin, composite deodorizer, epoxy-functionalized styrene-acrylate oligomer, coloring pigment, compatibilizer, lubricant and antioxidant to obtain a mixture; S2. Place the mixture in a twin-screw extruder, extrude and granulate to obtain deodorizing and brightening functional masterbatch for PCR plastics; The extruder's temperature zones are set to 170℃~210℃, and the screw speed is 300~450 rpm.

[0029] Preferably, the extruder includes seven zones, with the temperature of zone one being 170℃-180℃, zone two being 175℃-185℃, zone three being 180℃-190℃, zone four being 185℃-195℃, zone five being 190℃-200℃, zone six being 195℃-205℃, and zone seven being 200℃-210℃.

[0030] By adopting the above technical solution, the temperature zones of the extruder are controlled within the range of 170℃~210℃, and with a screw speed of 300~450 rpm, the carrier resin is fully melted and the functional components are evenly distributed.

[0031] In summary, this application has the following beneficial effects: 1. This application achieves a multi-functional integrated improvement in PCR plastics by synergistically combining components such as carrier resin, composite deodorizer, and high-functionality epoxy-functionalized styrene-acrylate oligomer, thereby enhancing deodorization, brightening, and restoring mechanical properties. The composite deodorizer uses an amino-modified porous filler combined with zinc ricinoleate, which efficiently removes odors through a triple mechanism of physical adsorption, chemical bonding, and catalytic degradation; the epoxy-functionalized oligomer repairs broken molecular chains, improving melt flowability and mechanical properties; and the compatibilizer and lubricant work synergistically to reduce surface precipitation and enhance gloss.

[0032] 2. The modified porous filler in this application forms a core-shell structure by loading CeO2 / ZnO and grafting cyclodextrin copolymer, which enhances interfacial compatibility, stress transmission and surface density, and simultaneously achieves deep deodorization, brightening and toughening, thus expanding the application prospects of PCR plastics in high-end packaging and indoor products. Detailed Implementation

[0033] Metallocene polyethylene is ExxonMobil's 2705MC product.

[0034] The copolymer polypropylene is LyondellBasell's EP380U product.

[0035] MAH-g-POE is a product of Dow Chemical's GR208.

[0036] Example 1 A deodorizing and brightening functional masterbatch for PCR plastics is prepared by the following method: S1. Mix 3000g of carrier resin (metallocene polyethylene), 1000g of composite deodorizer, 300g of epoxy-functionalized styrene-acrylate oligomer, 1000g of coloring pigment (titanium dioxide), 300g of compatibilizer (MAH-g-POE), 200g of lubricant and 50g of antioxidant (antioxidant 1010) to obtain a mixture; Epoxy-functionalized styrene-acrylate oligomers with a weight-average molecular weight of 5000, a functionality of 4, and an epoxy value of 0.08 mol / 100g. The compound deodorizer is prepared by the following method: 714g of porous filler (zeolite) was baked and activated at 180℃ for 1 hour to remove moisture. It was then added to a high-speed mixer and sprayed with 36g of aminosilane coupling agent (γ-aminopropyltriethoxysilane) and mixed. 286g of zinc ricinoleate was then added and mixed again to obtain a composite deodorizer. The lubricant is composed of erucamide and N,N'-ethylenebis-stearamide in a weight ratio of 1:1; S2. Place the mixture in a twin-screw extruder, extrude and granulate to obtain deodorizing and brightening functional masterbatch for PCR plastics; The screw speed of the extruder is 300~450 rpm.

[0037] The extruder consists of zones one through seven. The temperature in zone one is 170℃, in zone two it is 175℃, in zone three it is 180℃, in zone four it is 185℃, in zone five it is 190℃, in zone six it is 195℃, and in zone seven it is 200℃.

[0038] The difference between Examples 2-3 and Example 1 lies in the types, amounts, and parameters of raw materials used to prepare the deodorizing and brightening functional masterbatch for PCR plastics. Specific differences are shown in Table 1. Table 1. Raw material types, dosages, and parameters for preparing deodorizing and brightening functional masterbatches for PCR plastics.

[0039] Example 4 A deodorizing and brightening functional masterbatch for PCR plastics, the difference between this embodiment and Example 1 is that the porous packing material is a modified porous packing material, prepared by the following method: 1) 1500g of porous packing (zeolite) was impregnated in 7500ml of a mixed solution of cerium nitrate and zinc nitrate, ultrasonicated, dried, heated to 350℃, and kept at that temperature for 3h to obtain the supported CeO2 / ZnO porous packing. 2) Place 1500g of CeO2 / ZnO porous packing material in 7500ml of deionized water, add 75g of emulsifier (sodium dodecyl sulfate), sonicate, introduce nitrogen gas and heat to 70℃, add 1350ml of monomer mixture and 750ml of initiator solution dropwise. After the addition is complete, keep the reaction at the temperature for 3h, then heat to 80℃ for 1h, filter to remove gel particles, dry, and obtain modified porous packing material; The monomer mixture was obtained by preheating and stirring 375g of methacrylated β-cyclodextrin, 937.5g of butyl acrylate and 37.5g of emulsifier (sodium dodecyl sulfate) at 55°C. The initiator solution was obtained by dissolving potassium persulfate in deionized water, with a concentration of 0.025 g / mL; The mixed solution of cerium nitrate and zinc nitrate was obtained by dissolving cerium nitrate and zinc nitrate in deionized water, wherein the concentration of cerium nitrate was 0.04 g / mL and the concentration of zinc nitrate was 0.02 g / mL.

[0040] Example 5 A deodorizing and brightening functional masterbatch for PCR plastics, the difference between this embodiment and Example 1 is that the porous packing material is a modified porous packing material, prepared by the following method: 1) 1500g of porous packing (zeolite) was impregnated in 6000ml of a mixed solution of cerium nitrate and zinc nitrate, sonicated, dried, heated to 400℃, and kept at that temperature for 4h to obtain the supported CeO2 / ZnO porous packing. 2) Place 1500g of CeO2 / ZnO porous filler in 6000ml of deionized water, add 90g of emulsifier (PEG-4000), sonicate, introduce nitrogen gas and heat to 75℃, add 1560g of monomer mixture and 600ml of initiator solution dropwise. After the addition is complete, keep the reaction at the temperature for 4h, then heat to 85℃ for 2h, filter to remove gel particles, dry, and obtain modified porous filler; The monomer mixture was obtained by preheating and stirring 450g of methacrylated β-cyclodextrin, 1050g of butyl acrylate and 60g of emulsifier (PEG-4000) at 60°C. The initiator solution was obtained by dissolving potassium persulfate in deionized water, with a concentration of 0.05 g / mL; The mixed solution of cerium nitrate and zinc nitrate was obtained by dissolving cerium nitrate and zinc nitrate in deionized water, wherein the concentration of cerium nitrate was 0.06 g / mL and the concentration of zinc nitrate was 0.03 g / mL.

[0041] Example 6 A deodorizing and brightening functional masterbatch for PCR plastics, the difference between this embodiment and Example 1 is that the epoxy-functionalized styrene-acrylate oligomer is composed of low molecular weight epoxy-functionalized styrene-acrylate oligomer and medium molecular weight epoxy-functionalized styrene-acrylate oligomer in a weight ratio of 1:3. The low molecular weight epoxy-functionalized styrene-acrylate oligomer has a weight average molecular weight of 1000, a functionality of 6, and an epoxy value of 0.06 mol / 100g. The medium molecular weight epoxy-functionalized styrene-acrylate oligomer has a weight average molecular weight of 5000, a functionality of 4, and an epoxy value of 0.08 mol / 100g.

[0042] Example 7 A deodorizing and brightening functional masterbatch for PCR plastics, the difference between this embodiment and Example 1 is that the epoxy-functionalized styrene-acrylate oligomer is composed of low molecular weight epoxy-functionalized styrene-acrylate oligomer and medium molecular weight epoxy-functionalized styrene-acrylate oligomer in a weight ratio of 1:5. The low molecular weight epoxy-functionalized styrene-acrylate oligomer has a weight-average molecular weight of 3000, a functionality of 8, and an epoxy value of 0.3 mol / 100g. The medium molecular weight epoxy-functionalized styrene-acrylate oligomer has a weight average molecular weight of 8000, a functionality of 7, and an epoxy value of 0.087 mol / 100g.

[0043] Example 8 A deodorizing and brightening functional masterbatch for PCR plastics, the difference between this embodiment and Example 1 is that zinc oleate is used instead of zinc castor oil.

[0044] Comparative Example 1 A color masterbatch for PCR plastics, the difference between this comparative example and Example 1 is that γ-aminopropyltrimethoxysilane is used instead of epoxy-functionalized styrene-acrylate oligomer.

[0045] Comparative Example 2 A color masterbatch for PCR plastics, the difference between this comparative example and Example 1 is that the composite deodorizer is replaced with a single zeolite.

[0046] Comparative Example 3 A color masterbatch for PCR plastics, the difference between this comparative example and Example 1 is that the functionality of the epoxy-functionalized styrene-acrylate oligomer is 2.

[0047] Detection methods / test methods Samples: The color masterbatches obtained in Examples 1-8 and Comparative Examples 1-3 were added at a rate of 4% to 100% PCR-PET (post-consumer recycled PET, derived from recycled personal care product packaging bottles, with a strong odor), and injection molded into standard test samples.

[0048] Odor rating: Subjective olfaction was conducted according to the German Association of the Automotive Industry (VDA) 270 standard. Ratings were 1-6 (Level 1: Undetectable; Level 2: Perceptible, but not uncomfortable; Level 3: Noticeable but acceptable; Level 4: Notable, slightly uncomfortable; Level 5: Noticeably uncomfortable, unbearable; Level 6: Unbearable).

[0049] Total volatile organic compound emissions (TVOC): The amount of VOC emitted from the sample was determined by headspace gas chromatography / mass spectrometry (HS-GC / MS), in μgC / g.

[0050] Surface gloss: Refer to GB / T 9754-2007 and use a gloss meter to measure the sample surface at an incident angle of 60°.

[0051] Notched impact strength: Refer to GB / T 1043.1-2008, test unit kJ / m². Experimental data are shown in Table 2: Table 2 Experimental data of Examples 1-8 and Comparative Examples 1-3

[0052] The experimental data above show that the synergistic effect of the composite deodorizer, epoxy-functionalized styrene-acrylate oligomer, and compatibilizer has achieved the synergistic effect of removing odors, improving surface gloss, and enhancing mechanical properties of PCR plastics.

[0053] Based on the experimental data from Example 1 and Comparative Examples 1-3, it can be seen that this application, through the combined use of a specific epoxy-functionalized styrene-acrylate oligomer and a specific composite deodorizer, greatly reduces the odor of PCR plastics while also improving the gloss and mechanical properties of PCR plastics.

[0054] Based on the experimental data from Examples 1 and 4-5, it can be seen that preparing modified porous fillers by a specific method is beneficial to further reduce the odor and volatile substances in PCR plastics, can deeply remove odors, and at the same time improve the gloss and mechanical properties of PCR plastics, achieving a simultaneous breakthrough in deodorization, brightening and toughening.

[0055] Based on the experimental data from Examples 1 and 6-7, it can be seen that by using low molecular weight epoxy-functionalized styrene-acrylate oligomers and medium molecular weight epoxy-functionalized styrene-acrylate oligomers in synergy, broken molecular chains can be effectively repaired, greatly improving melt stability and mechanical properties, and overcoming the limitations of single molecular weight chain extenders in toughening and brightening.

[0056] Based on the experimental data from Examples 1 and 8, it can be seen that zinc ricinoleate has the ability to specifically capture and neutralize the irritating odor of certain small molecules in PCR plastics, which is beneficial to reducing the odor and volatile substances in PCR plastics.

[0057] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A deodorizing and brightening functional masterbatch for PCR plastics, characterized in that, It is prepared from the following raw materials in parts by weight: 30-50 parts of carrier resin; 10-20 parts of compound deodorizer; 3-8 parts of epoxy-functionalized styrene-acrylate oligomer; 3-8 parts compatibilizer; 2-5 parts lubricant; Antioxidant 0.5-1.5 parts; The functionality of the epoxy-functionalized styrene-acrylate oligomer is ≥4.

2. The deodorizing and brightening functional masterbatch for PCR plastics according to claim 1, characterized in that: The composite deodorizer is composed of amino-modified porous filler and zinc ricinoleate in a weight ratio of (5-10):

2.

3. The deodorizing and brightening functional masterbatch for PCR plastics according to claim 2, characterized in that, The composite deodorizer is prepared by the following method: The porous filler is baked and activated at 180-200℃ for 1-2 hours to remove moisture, then added to a high-speed mixer, sprayed with aminosilane coupling agent and mixed, and then zinc ricinoleate is added and mixed again to obtain a composite deodorizer.

4. The deodorizing and brightening functional masterbatch for PCR plastics according to claim 3, characterized in that, The porous packing is a modified porous packing, prepared by the following method: 1) Immerse 40-50g of porous packing in 200ml of a mixed solution of cerium nitrate and zinc nitrate, sonicate, dry, heat to 350-400℃, and keep warm for 3-4h to obtain the supported CeO2 / ZnO porous packing. 2) Place 40-50g of CeO2 / ZnO porous filler in 200ml of deionized water, add 2-3g of emulsifier, sonicate, introduce nitrogen gas and heat to 70-75℃, add 36-52g of monomer mixture and 20ml of initiator solution dropwise. After the addition is complete, keep the reaction at the temperature for 3-4h, then heat to 80-85℃ for 1-2h, filter to remove gel particles, dry, and obtain the modified porous filler; The monomer mixture is obtained by preheating and stirring 10-15g of methacrylated β-cyclodextrin, 25-35g of butyl acrylate and 1-2g of emulsifier at 55-60℃. The initiator solution was obtained by dissolving potassium persulfate in deionized water, with a concentration of 0.025-0.05 g / mL; The cerium nitrate and zinc nitrate mixed solution is obtained by dissolving cerium nitrate and zinc nitrate in deionized water, wherein the concentration of cerium nitrate is 0.04-0.06 g / mL and the concentration of zinc nitrate is 0.02-0.03 g / mL.

5. The deodorizing and brightening functional masterbatch for PCR plastics according to claim 1, characterized in that: The epoxy-functionalized styrene-acrylate oligomer is composed of low molecular weight epoxy-functionalized styrene-acrylate oligomer and medium molecular weight epoxy-functionalized styrene-acrylate oligomer in a weight ratio of 1:(3-5). The weight-average molecular weight of the low molecular weight epoxy-functionalized styrene-acrylate oligomer is 1000-3000. The weight average molecular weight of the medium molecular weight epoxy-functionalized styrene-acrylate oligomer is 5000-8000.

6. The deodorizing and brightening functional masterbatch for PCR plastics according to claim 1, characterized in that: It also includes 10-30 parts of coloring pigment, which includes at least one of titanium dioxide, carbon black and environmentally friendly color powder.

7. The deodorizing and brightening functional masterbatch for PCR plastics according to claim 1, characterized in that: The carrier resin is one of metallocene polyethylene or copolymer polypropylene.

8. The deodorizing and brightening functional masterbatch for PCR plastics according to claim 1, characterized in that: The compatibilizer is a maleic anhydride-grafted elastomer.

9. The deodorizing and brightening functional masterbatch for PCR plastics according to claim 1, characterized in that: The lubricant consists of erucamide and N,N'-ethylenebis-stearamide.

10. A method for preparing a deodorizing and brightening functional masterbatch for PCR plastics as described in any one of claims 1-9, characterized in that, The preparation steps include the following: S1. Mix the carrier resin, composite deodorizer, epoxy-functionalized styrene-acrylate oligomer, coloring pigment, compatibilizer, lubricant and antioxidant to obtain a mixture; S2. Place the mixture in a twin-screw extruder, extrude and granulate to obtain deodorizing and brightening functional masterbatch for PCR plastics; The extruder's temperature zones are set to 170℃~210℃, and the screw speed is 300~450 rpm. A two-stage high-vacuum extraction system with a vacuum degree of -0.08 ~ -0.09 MPa must be installed in the middle and rear sections of the extruder.

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