A photo-oxygen barrier and a method for preparing the same

Abstract

The application provides a light-oxygen barrier agent and relates to the technical field of packaging materials.The light-oxygen barrier agent comprises, in percentage by mass, 1-65% of a light-blocking component, 1-30% of an active oxygen-absorbing component and 5-98% of a base material.The light-blocking component comprises titanium white powder, aluminum powder, carbon black, a dispersing agent and a liquid preparation; and the active oxygen-absorbing component comprises an oxygen-blocking material and a cobalt salt.The light-oxygen barrier agent is developed for semi-light-transmitting or full-light-blocking packaging that has both light-blocking and oxygen-blocking requirements.Titanium white powder fills the micropores in the resin under the action of the liquid preparation to achieve the purpose of passive oxygen blocking; and the oxygen-blocking material plays an active oxygen-absorbing role under the action of the cobalt salt, so that the oxygen-blocking effect of the packaging material is better, the oxygen-blocking time is longer, and oxygen-sensitive substances are protected.Titanium white powder is a granular structure, and aluminum powder is a flaky structure; the two are used in combination to achieve a synergistic effect, so that the packaging has a good appearance and better light-blocking effect, and light-sensitive substances are protected.

Description

Technical Field

[0001] This invention belongs to the field of packaging materials technology, and relates to an additive for packaging materials, specifically a light and oxygen barrier agent and its preparation method. Background Technology

[0002] Food, beverages, medicines, and cosmetics are all indispensable items in people's lives. However, these products all contain substances that are sensitive to light and oxygen. These substances are easily damaged by light and oxygen, causing deterioration and ultimately altering the product's color, odor, taste, or efficacy. Therefore, various light-blocking agents and oxygen-absorbing agents are currently available on the market. By mixing these agents with packaging materials to create appropriate containers for packaging products, light can be effectively blocked from entering or oxygen inside the packaging and outside air can be prevented from penetrating into the packaging, thereby achieving the purpose of protecting the product.

[0003] Patent WO03035486 discloses polyolefins as oxygen-absorbing materials to reduce the impact of oxygen on the packaged product. However, polyolefins have low polarity, poor compatibility with polyester packaging materials, and are not easy to distribute evenly. Furthermore, the reaction between polyolefins and oxygen is irreversible, and the oxygen barrier effect deteriorates and the oxygen barrier time is shortened after the polyolefins are consumed.

[0004] Patent CN113734626A discloses a white packaging container. The container wall includes a first light-blocking layer and a second light-blocking layer. The first and second light-blocking layers respectively include a first light-blocking agent and a second light-blocking agent, and also include an oxygen absorber. The first light-blocking agent is selected from at least one of white masterbatch, white color oil, and bluish-gray masterbatch; the second light-blocking agent is selected from at least one of color oil, carbon black, and solid masterbatch; and the oxygen absorber is selected from valOR Activ115J-M and / or oxygen absorber amosorb 4020E. The packaging container wall disclosed in this patent includes at least two layers, and each layer requires two light-blocking agents and an oxygen absorber to achieve the effects of light blocking and oxygen blocking. The manufacturing process is complex and not conducive to industrial production.

[0005] Patent CN113698744A discloses a PET juice beverage bottle with high barrier properties, including an oxygen barrier and a light blocker. The oxygen barrier includes at least one of poly(m-phenylene adipamide), a phosphite antioxidant (TNP), and an antioxidant (ODP); the light blocker includes at least one of an amine light stabilizer or an ultraviolet absorber. However, the oxygen barrier such as poly(m-phenylene adipamide) described in this patent is a passive oxygen barrier, which can only passively block oxygen molecules and cannot actively capture them, thus having limited protective effect on juice beverages. The light blocker mainly blocks light in the ultraviolet region (300-400nm), and cannot achieve full-spectrum (300-700nm) light blocking, while light in the visible light region (400-700nm) also has a destructive effect on juice beverages.

[0006] Therefore, it is of great significance to develop a photo-oxidation barrier agent that is compatible with packaging materials, has good photo-oxidation barrier effect, and has a simple preparation process. Summary of the Invention

[0007] This invention addresses the problems existing in the prior art by providing a photo-oxidation barrier agent. The photo-oxidation barrier agent is suitable for semi-transparent or fully light-blocking packaging materials that require both light blocking and oxygen blocking. It has excellent light blocking and oxygen blocking effects, good compatibility with packaging materials, a simple preparation process, and is easy to mass-produce industrially.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] This invention provides a light-blocking agent, comprising, by weight percentage: 1-65% light-blocking component, 1-30% active oxygen-absorbing component, and 5-98% substrate.

[0010] The active oxygen absorption component includes oxygen-barrier materials and cobalt salts;

[0011] The substrates include polyethylene terephthalate (PET), copolyesters (PETG, PCTG, PCTA, Tritan, biodegradable copolyester), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyamide (PA), polylactic acid (PLA), acrylonitrile-styrene copolymer (AS), acrylonitrile-butadiene-styrene copolymer (ABS), polycarbonate (PC), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), unsaturated polyester (UP), liquid polyester, liquid polyurethane, liquid olefin copolymer, liquid siloxane, liquid fatty acid ester, liquid alkanes, liquid cycloalkanes, liquid aromatic hydrocarbons, vegetable oils, and animal oils, etc.

[0012] When the substrate is a solid substrate, the light-blocking components include titanium dioxide, aluminum powder, carbon black, dispersant, and liquid formulation;

[0013] When the substrate is a liquid substrate, the light-blocking components include titanium dioxide, aluminum powder, and carbon black.

[0014] The present invention also provides a method for preparing the photo-oxidation barrier, comprising the following steps:

[0015] The light-blocking component, the active oxygen-absorbing component, and the substrate are added to a screw extruder. After the components are fully melted and mixed in the screw extruder, they are extruded and then cooled, granulated, and dried to obtain a solid granular light and oxygen barrier agent.

[0016] Alternatively, the substrate and light-blocking component are added to a mixer in proportion and stirred, then an active oxygen-absorbing component is added, and the mixture is stirred evenly under vacuum. Finally, the mixture is ground and filtered under a nitrogen atmosphere to obtain a light-oxidation barrier.

[0017] The present invention also provides the application of the photo-oxidation barrier agent in packaging materials, including but not limited to packaging bottles, packaging cups, packaging boxes, packaging cans, packaging barrels, packaging films, packaging bags, etc.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The photo-oxidation barrier agent of the present invention not only has the effect of blocking light, but also has the functions of active oxygen absorption and passive oxygen blocking.

[0020] 2. The surface of titanium dioxide is treated to improve the compatibility between titanium dioxide, substrate, and oxygen barrier material, thus solving the problem of poor compatibility caused by polarity differences.

[0021] 3. Under the action of cobalt salt, the oxygen barrier material plays an active role in absorbing oxygen, while titanium dioxide fills the micropores in the resin under the action of liquid formulation, thus playing a passive role in blocking oxygen. The combination of active and passive effects makes the packaging material have a better barrier effect on oxygen and a longer barrier time.

[0022] 4. Granular titanium dioxide and flake aluminum powder can be used together to achieve a synergistic effect, giving the packaging material a better light-blocking effect. Attached Figure Description

[0023] Figure 1 This is a transmittance graph of PET bottles containing different additives.

[0024] Figure 2 This is a transmittance graph of PET bottles containing different additives.

[0025] Figure 3 The graph shows the oxygen permeability of PET bottles containing different additives.

[0026] Figure 4 The graph shows the oxygen permeability of PET bottles containing different additives. Detailed Implementation

[0027] The technical solution of the present invention will be described in detail below.

[0028] There are no particular restrictions on the source of any raw materials used in this invention; they can be purchased from the market or prepared using conventional methods well known to those skilled in the art. Unless otherwise specified, the amounts of all raw materials used in this method are expressed as a percentage by mass.

[0029] This invention provides a light-blocking agent, comprising, by weight percentage: 1-65% light-blocking component, 1-30% active oxygen-absorbing component, and 5-98% substrate.

[0030] Furthermore, the photo-oxidation barrier agent comprises, by weight percentage: 20-60% light-blocking component, 2-20% active oxygen-absorbing component, and 20-78% substrate.

[0031] Furthermore, the substrate is a solid substrate or a liquid substrate, wherein the solid substrate is selected from polyethylene terephthalate (PET), copolyesters (PETG, PCTG, PCTA, Tritan, biodegradable copolyester), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyamide (PA), polylactic acid (PLA), acrylonitrile-styrene copolymer (AS), acrylonitrile-butadiene-styrene copolymer (ABS), polycarbonate (PC), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), unsaturated polyester (UP), etc.;

[0032] The liquid substrate is selected from liquid polyester, liquid polyurethane, liquid olefin copolymer, liquid siloxane, liquid fatty acid ester, liquid alkanes, liquid cycloalkanes, liquid aromatic hydrocarbons, vegetable oils and animal oils, etc.

[0033] Furthermore, when the substrate is a solid substrate, the light-blocking component includes titanium dioxide, aluminum powder, carbon black, dispersant, and liquid formulation;

[0034] When the substrate is a liquid substrate, the light-blocking components include titanium dioxide, aluminum powder, and carbon black.

[0035] Furthermore, the active oxygen-absorbing component includes an oxygen-barrier material and a cobalt salt. The oxygen-barrier material is selected from at least one of polybutadiene, polyethylene, polypropylene, nylon, polypentene, polyisoprene, and polymethylpentene. The cobalt salt is not specifically limited and may be, for example, cobalt stearate, cobalt octate, cobalt naphthenate, etc.

[0036] Furthermore, the dispersant is selected from at least one of polyethylene wax, stearic acid, stearate, white oil, paraffin wax, and EBS.

[0037] In some embodiments of the present invention, when the substrate is a solid substrate, the light-blocking components, by mass percentage, comprise 8-99% titanium dioxide, 0-3% aluminum powder, 0-2% carbon black, 0.5-5% dispersant, and 0.5-91% liquid formulation.

[0038] Preferably, when the substrate is a solid substrate, the light-blocking components, by mass percentage, comprise 50-99% titanium dioxide, 0-3% aluminum powder, 0-2% carbon black, 0.5-5% dispersant, and 0.5-45% liquid formulation.

[0039] More preferably, when the substrate is a solid substrate, the light-blocking components, by mass percentage, comprise 80-98% titanium dioxide, 0.01-3% aluminum powder, 0.001-2% carbon black, 0.5-5% dispersant, and 1-18% liquid formulation.

[0040] When the substrate is a liquid substrate, the light-blocking components, by mass percentage, contain 95-100% titanium dioxide, 0-3% aluminum powder, and 0-2% carbon black.

[0041] Preferably, when the substrate is a liquid substrate, the light-blocking components, by mass percentage, contain 95-99.98% titanium dioxide, 0.01-3% aluminum powder, and 0.001-2% carbon black.

[0042] In some embodiments of the present invention, the titanium dioxide is surface-treated with a surface treatment agent, which is a polyol, organosilicon, or organoamine.

[0043] Further, the surface treatment agent is selected from at least one of trimethylolethane (TME), trimethylolpropane (TMP), neopentyl glycol (NPG), pentaerythritol (PER), polyethylene glycol (PEG), D-7033C, methacryloyloxypropyltrimethoxysilane, vinyltriethoxysilane, vinyltris(β-methoxyethoxy)silane, aminopropyltriethoxysilane, methyltris(tert-butylperoxy)silane, triethanolamine, trimethylamine, or isopropanolamine.

[0044] The source of the titanium dioxide used for surface treatment described in this invention is not specifically limited; commercially available products or conventional methods in the art can be used for surface treatment.

[0045] In some embodiments of the present invention, the mass ratio of titanium dioxide to surface treatment agent is 85-99.9:15-0.1.

[0046] In some embodiments of the present invention, the surface treatment process includes: wetting titanium dioxide with water, stirring, adding a surface treatment agent in proportion, stirring, filtering, drying, and pulverizing to obtain surface-treated titanium dioxide.

[0047] Titanium dioxide is surface-treated with a surface treatment agent to obtain titanium dioxide coated with organic matter. When titanium dioxide is mixed with liquid formulations, substrates, and active oxygen-absorbing components to prepare photo-oxidation barrier agents, the surface treatment agent of the titanium dioxide can form strong valence bond cross-linking with other components, enhancing the compatibility between materials. Simultaneously, the substrate and liquid formulation are selected based on the properties of the packaging material to ensure good compatibility between raw materials, thereby enabling the photo-oxidation barrier agent to be uniformly dispersed within the packaging material, ensuring that the effectiveness of different parts of the same container is not significantly different.

[0048] In some embodiments of the present invention, the liquid formulation is a liquid small molecule compound or a liquid small molecule polymer, selected from at least one of liquid paraffin, liquid organosilicon, alcohols, liquid polyurethane, liquid fatty acid esters, liquid alkanes, liquid cycloalkanes, liquid aromatic hydrocarbons, and vegetable oils.

[0049] Liquid formulations are small-molecule compounds or polymers with low molecular weight, short chain segments, and faster chain segment movement. This chain segment movement carries titanium dioxide into the resin micropores of the packaging material; and / or the agglomeration of titanium dioxide is significantly improved under the action of liquid formulations, allowing titanium dioxide particles to enter the resin micropores of the packaging material. When oxygen attempts to enter the resin from the outside of the packaging material and then gradually migrate to the inside to damage the product, the pores are filled with titanium dioxide particles, thus prolonging the oxygen's penetration path or directly blocking this penetration method, thereby achieving the purpose of passive oxygen barrier. Especially when the substrate is solid, adding liquid formulations significantly improves the light and oxygen barrier effects. When the substrate is liquid, the liquid substrate already acts as the liquid formulation, so no further addition of liquid formulations is necessary.

[0050] In some embodiments of the present invention, the active oxygen-absorbing component comprises, by mass percentage, 75-99.8% oxygen-barrier material and 0.2-25% cobalt salt.

[0051] Oxygen-barrier materials, aided by cobalt salts, actively absorb oxygen, while titanium dioxide, through liquid formulations, fills the gaps between resin chain segments, passively blocking oxygen. The combined use of these two materials enhances the oxygen-barrier effect of the packaging material, prolonging its barrier time and protecting oxygen-sensitive substances. Titanium dioxide has a granular structure, while aluminum powder has a flake structure; their combined use creates a synergistic effect, resulting in packaging that offers both a good appearance and superior light-blocking properties, protecting photosensitive substances.

[0052] The aluminum powder and carbon black in the photo-oxidation barrier of this invention can be added selectively depending on the requirements of the specific packaging material. For example, if a white packaging material with high color requirements is to be prepared, aluminum powder and carbon black do not need to be added to the photo-oxidation barrier. However, if the light-blocking performance of the packaging material is required, aluminum powder and carbon black need to be added.

[0053] The present invention also provides a method for preparing the photo-oxidation barrier, comprising the following steps:

[0054] When the substrate is a solid substrate, the light-blocking component, the active oxygen-absorbing component and the substrate are added to a screw extruder. The components are melt-mixed in the screw extruder and then extruded. After cooling, granulation and drying, a solid granular light and oxygen barrier is obtained.

[0055] When the substrate is a liquid substrate, the substrate and the light-blocking component are added to a mixer in proportion and stirred and mixed. Then, an active oxygen-absorbing component is added, and the mixture is stirred evenly under vacuum. Finally, the light-blocking agent is obtained by grinding and filtering under a nitrogen atmosphere.

[0056] The present invention also provides the application of the photo-oxidation barrier agent in packaging materials, including but not limited to packaging bottles, packaging cups, packaging boxes, packaging cans, packaging barrels, packaging films, packaging bags, etc.

[0057] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In addition, it is worth noting that the raw materials involved in the present invention are all commercially available products unless otherwise specified.

[0058] Example 1

[0059] The photo-oxidation barrier agent in this embodiment includes 3800g of titanium dioxide, 19g of aluminum powder, 2g of carbon black, 120g of polyethylene wax, 150g of liquid paraffin, 1450g of polybutadiene, 150g of cobalt stearate, and 4309g of PET substrate.

[0060] The titanium dioxide is surface-treated with pentaerythritol;

[0061] The preparation method of the photo-oxidation barrier agent is as follows: the light-blocking component, the active oxygen-absorbing component and the base material are added to a screw extruder. The components are melt-mixed in the screw extruder and then extruded. After cooling, granulation and drying, a solid granular photo-oxidation barrier agent is obtained.

[0062] Example 2

[0063] The photo-oxidation barrier agent in this embodiment includes 1900g of titanium dioxide, 25g of aluminum powder, 3g of carbon black, 120g of polyethylene wax, 2050g of liquid polyurethane, 1450g of nylon, 150g of cobalt naphthenate, and 4302g of PET substrate.

[0064] The titanium dioxide is surface-treated with pentaerythritol;

[0065] The preparation method of the photo-oxidation barrier agent is as follows: the light-blocking component, the active oxygen-absorbing component and the base material are added to a screw extruder. The components are melt-mixed in the screw extruder and then extruded. After cooling, granulation and drying, a solid granular photo-oxidation barrier agent is obtained.

[0066] Example 3

[0067] The photo-oxidation barrier agent in this embodiment includes 3920g of titanium dioxide, 16g of aluminum powder, 4g of carbon black, 20g of polyethylene wax, 40g of liquid polyurethane, 1450g of polybutadiene, 150g of cobalt stearate, and 4400g of PET substrate.

[0068] The titanium dioxide is surface-treated with pentaerythritol;

[0069] The preparation method of the photo-oxidation barrier agent is as follows: the light-blocking component, the active oxygen-absorbing component and the base material are added to a screw extruder. The components are melt-mixed in the screw extruder and then extruded. After cooling, granulation and drying, a solid granular photo-oxidation barrier agent is obtained.

[0070] Example 4

[0071] The photo-oxidation barrier agent in this embodiment includes 4600g of titanium dioxide, 15g of aluminum powder, 1g of carbon black, 1125g of polybutadiene, 100g of cobalt octanoate, and 4159g of liquid polyurethane substrate.

[0072] The titanium dioxide is surface-treated with vinyltriethoxysilane;

[0073] The preparation method of the photo-oxidation barrier agent is as follows: the substrate and the light-blocking component are added to a mixer in proportion and stirred and mixed, then the active oxygen-absorbing component is added and stirred evenly under vacuum, and finally the photo-oxidation barrier agent is obtained by grinding and filtering under a nitrogen atmosphere.

[0074] Example 5

[0075] The photo-oxidation barrier agent in this embodiment includes 3800g of titanium dioxide, 120g of polyethylene wax, 150g of liquid paraffin, 1450g of polybutadiene, 150g of cobalt stearate, and 4330g of PET substrate.

[0076] The titanium dioxide is surface-treated with pentaerythritol;

[0077] The preparation method of the photo-oxidation barrier agent is as follows: the light-blocking component, the active oxygen-absorbing component and the base material are added to a screw extruder. The components are melt-mixed in the screw extruder and then extruded. After cooling, granulation and drying, a solid granular photo-oxidation barrier agent is obtained.

[0078] Comparative Example 1

[0079] This comparative example is basically the same as Example 1, except that the light-blocking components (titanium dioxide, aluminum powder, carbon black, dispersant, liquid formulation) in Example 1 are replaced with an equal amount of substrate to obtain an active oxygen absorber that only has an active oxygen absorption effect.

[0080] Comparative Example 2

[0081] This comparative example is basically the same as Example 1, except that the titanium dioxide in Example 1 is untreated titanium dioxide, and a solid particulate photo-oxidation barrier is obtained according to the preparation method of Example 1.

[0082] Comparative Example 3

[0083] This comparative example is basically the same as Example 1, except that the liquid paraffin in Example 1 is replaced with an equal amount of the substrate, and a solid particulate photo-oxidation barrier is obtained according to the preparation method of Example 1.

[0084] Application examples

[0085] The photo-oxidation barrier agent and active oxygen absorber of Examples 1-5 and Comparative Examples 1-3 were respectively added to PET (China Resources Chemical CR-8816) to form preforms and blow-dry bottles. The preform mold weight was 20g and the bottle volume was 350mL, thus obtaining PET bottles containing 2% photo-oxidation barrier agent and PET bottles containing 2% active oxygen absorber.

[0086] Performance testing

[0087] transmittance test

[0088] The transmittance of the PET bottles prepared in the application example was measured using a Lambda 950 UV-Vis spectrophotometer at different wavelengths (see [reference]). Figure 1 , Figure 2 Blank PET bottles without photo-oxidation barrier agents were used as a control group. Figure 1 , Figure 2 As shown, at 380 nm, the transmittance of the control group blank PET bottle was 65.7%. The transmittances of the PET bottles containing 2% of the light-blocking agents from Examples 1-5 and Comparative Examples 2-3 were 1.4%, 4.2%, 3.0%, 1.9%, 10.3%, 8.5%, and 7.5%, respectively. The transmittance of the PET bottle containing the active oxygen absorber in Comparative Example 1 was 63.5%. Lower transmittance indicates better light-blocking effect. Comparative Example 1 did not contain any light-blocking components, so its transmittance was higher, close to that of the control group blank PET bottle. Example 5 did not contain aluminum powder and carbon black, so its transmittance was higher than that of Example 1, but the PET bottle containing 2% of Example 5 appeared whiter than that of Example 1.

[0089] Oxygen permeability test

[0090] The PET bottles prepared in the application example were tested using an oxygen analyzer to obtain the change in oxygen permeability inside the bottles over time (see [reference]). Figure 3 , Figure 4 Meanwhile, blank PET bottles without photo-oxidation barrier agents were used as a control group. Figure 3 , Figure 4 As shown, the PET bottle containing 2% of the active oxygen absorber in Comparative Example 1 gradually began to permeate oxygen after 3 months, while the PET bottle containing 2% of the photo-oxidation barrier agent (Examples 1-5) could extend the oxygen barrier effect to 5 months, indicating that the photo-oxidation barrier agent combining active oxygen absorption and passive oxygen barrier has a better oxygen barrier effect than the active oxygen absorber alone; the PET bottle containing 2% of the photo-oxidation barrier agent in Comparative Example 2 showed oxygen permeability after 4.5 months, indicating that the untreated titanium dioxide affected the oxygen barrier effect to some extent; the PET bottle containing 2% of the photo-oxidation barrier agent in Comparative Example 3 showed oxygen permeability after 4 months, indicating that the liquid formulation has a significant impact on the oxygen barrier effect.

[0091] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A photo-oxidation barrier agent, characterized in that, By weight percentage, it comprises: 20-60% light-blocking component, 2-20% active oxygen-absorbing component, and 20-78% substrate; the substrate is a solid substrate, and the light-blocking component includes titanium dioxide, aluminum powder, carbon black, dispersant, and liquid formulation; the titanium dioxide is surface-treated with a surface treatment agent, which is a polyol, organosilicon, or organic amine; the active oxygen-absorbing component includes an oxygen-blocking material and a cobalt salt, and the oxygen-blocking material is selected from at least one of polybutadiene, polyethylene, polypropylene, nylon, polypentene, polyisoprene, and polymethylpentene; Of the light-blocking components, by mass percentage, titanium dioxide accounts for 80-98%, aluminum powder accounts for 0.01-3%, carbon black accounts for 0.001-2%, dispersant accounts for 0.5-5%, and liquid formulation accounts for 1-18%. The solid substrate is selected from at least one of polyethylene terephthalate, copolyester, polybutylene terephthalate, polypropylene, polyethylene, polystyrene, polyamide, polylactic acid, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, polycarbonate, polyvinyl chloride, polyvinylidene chloride, and unsaturated polyester. Of the active oxygen-absorbing components, oxygen-barrier materials account for 75-99.8% by mass percentage, and cobalt salts account for 0.2-25%.

2. The photo-oxidation barrier agent according to claim 1, characterized in that, The surface treatment agent is selected from at least one of trimethylolpropane, trimethylolpropane, neopentyl glycol, pentaerythritol, polyethylene glycol, D-7033C, methacryloyloxypropyltrimethoxysilane, vinyltriethoxysilane, vinyltris(β-methoxyethoxy)silane, aminopropyltriethoxysilane, methyltris(tert-butylperoxy)silane, triethanolamine, trimethylamine, or isopropanolamine.

3. The photo-oxidation barrier agent according to claim 2, characterized in that, The mass ratio of titanium dioxide to surface treatment agent is 85-99.9:15-0.

1.

4. The photo-oxidation barrier agent according to claim 1, characterized in that, The liquid formulation is selected from at least one of liquid paraffin, liquid organosilicon, alcohols, liquid polyurethane, liquid fatty acid esters, liquid alkanes, liquid cycloalkanes, liquid aromatic hydrocarbons, and vegetable oils; the dispersant is selected from at least one of polyethylene wax, stearic acid, stearate, white oil, paraffin wax, and EBS.

5. A photo-oxidation barrier agent, characterized in that, By weight percentage, it comprises: 20-60% light-blocking component, 2-20% active oxygen-absorbing component, and 20-78% substrate; the substrate is a liquid substrate, selected from at least one of liquid polyester, liquid polyurethane, liquid olefin copolymer, liquid siloxane, liquid fatty acid ester, liquid alkanes, liquid cycloalkanes, liquid aromatic hydrocarbons, vegetable oil, and animal oil; the light-blocking component includes titanium dioxide, aluminum powder, and carbon black; the titanium dioxide is surface-treated with a surface treatment agent, which is a polyol, organosilicon, or organic amine; the active oxygen-absorbing component includes an oxygen-blocking material and a cobalt salt, the oxygen-blocking material being selected from at least one of polybutadiene, polyethylene, polypropylene, nylon, polypentene, polyisoprene, and polymethylpentene; Of the light-blocking components, by mass percentage, titanium dioxide accounts for 95-99.98%, aluminum powder accounts for 0.01-3%, and carbon black accounts for 0.001-2%. Of the active oxygen-absorbing components, oxygen-barrier materials account for 75-99.8% by mass percentage, and cobalt salts account for 0.2-25%.

6. The photo-oxidation barrier agent according to claim 5, characterized in that, The surface treatment agent is selected from at least one of trimethylolpropane, trimethylolpropane, neopentyl glycol, pentaerythritol, polyethylene glycol, D-7033C, methacryloyloxypropyltrimethoxysilane, vinyltriethoxysilane, vinyltris(β-methoxyethoxy)silane, aminopropyltriethoxysilane, methyltris(tert-butylperoxy)silane, triethanolamine, trimethylamine, or isopropanolamine.

7. The photo-oxidation barrier agent according to claim 6, characterized in that, The mass ratio of titanium dioxide to surface treatment agent is 85-99.9:15-0.

1.

8. A method for preparing the photo-oxidation barrier agent according to any one of claims 1-4, comprising adding the light-blocking component, the active oxygen-absorbing component and the substrate into a screw extruder, wherein the components are melt-mixed in the screw extruder and then extruded, and after cooling, granulation and drying, a solid granular photo-oxidation barrier agent is obtained.

9. A method for preparing the photo-oxidation barrier agent according to any one of claims 5-7, comprising adding the substrate and the light-blocking component into a mixer in a certain proportion and stirring and mixing, then adding the active oxygen-absorbing component, stirring evenly, and finally grinding and filtering under a nitrogen atmosphere to obtain the photo-oxidation barrier agent.

10. The use of the photo-oxidation barrier agent according to any one of claims 1-7 in packaging materials.

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