Shading material and preparation method and application thereof

Abstract

The invention provides a shading material as well as a preparation method and application thereof. The light shielding material comprises the following components: 100 parts by weight of base resin; 0-50 parts by weight of crystalline polyester; 0.1-50 parts by weight of an opacifying agent pretreated by a surface functional agent; 0.1 to 40 parts by weight of a toughening agent; 0-2 parts by weight of a flame retardant; 0 to 2.5 parts by weight of an anti-UV agent; 0.01 to 2.5 parts by weight of an antioxidant; the preparation method comprises the following steps: melting, mixing, extruding and granulating the components in parts by weight to obtain the shading material. The prepared shading material is good in shading performance, high in impact resistance, high in mechanical modulus and good in impact retention rate and modulus retention rate after UV aging, and the thickness of the obtained shading material is gt; when the thickness is 1mm, the total light transmittance is lt; when the thickness is less than or equal to 1mm, the total light transmittance is lt; and the composite material can be used for electronic, electrical and electric appliance components.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer composite materials, and further relates to a light-shielding material, a preparation method thereof, and an application thereof. Background Art

[0002] High light-shielding materials are a type of composite materials based on polymer resins, which reflect light sources by adding a certain proportion of light-shielding additives. Their essential characteristics are light-shielding, light-impermeability, and preventing light leakage near the light source. The base materials that can be selected for light-shielding materials include: PP, PET, PBT, ABS, PC, etc. High light-shielding materials are widely used in the fields of IT device casings, lighting fixture lamp shades, electronic device components, plug-in components, automobiles, electric vehicles, high-speed rails, aviation, etc. Currently, a large amount of calcium carbonate, talcum powder, titanium dioxide, montmorillonite, etc. are generally used to achieve the light-shielding effect of the material (CN107216635A), but excessive addition of light-shielding agents will cause a sharp decline in the toughness, rigidity, etc. of the material, and it cannot meet the requirements for parts with toughness.

[0003] Chinese Patent CN112898761A discloses an intelligent terminal housing and a manufacturing method thereof, the resin is PC, PET, and the pigments are carbon black and titanium dioxide. The manufacturing process includes processes such as curing, electroplating, laminating, curing, and molding. Chinese Patent CN115637113A discloses the preparation of a black light-shielding protective film by multi-layer lamination of an antistatic coating, a PLA base layer containing a light-shielding material, an acrylate adhesive layer, and a PET release bottom layer. The above methods have cumbersome processes. Chinese Patent CN103333453A discloses that a high light-shielding ABS composite material prepared with a barium sulfate / titanium dioxide ratio of 3:2 to 2:1 has a total light transmittance of less than 5% (2 mm). Chinese Patents CN108623976A and CN113604013A respectively use polyaniline-coated nano-copper and polyaniline-coated nano-silica / graphite composites to prepare antistatic light-shielding PET films and antibacterial light-shielding PET films, which aim to achieve the purpose of light-shielding by utilizing the strong absorption effect of polyaniline-coated microspheres on visible light and the color of graphite particles themselves.

[0004] In order to achieve a better light-shielding effect of the light-shielding material in the above patents, the dosage of the light-shielding agent is large, and the overall mechanical properties of the material are severely damaged. To achieve a light-shielding rate of less than 1%, generally dark and black agents are used for covering, which is not applicable to light-colored and white systems. The prior art has problems of insufficient mechanical strength, toughness, and fluidity due to excessive pursuit of high light-shielding rate. The development of high light-shielding materials with high light-shielding rate, ultraviolet aging resistance, flame retardancy, and excellent processing performance has important application value. Summary of the Invention

[0005] In order to solve the technical problems existing in the prior art, the present invention provides a light-shielding material, a preparation method thereof, and an application thereof.

[0006] The present invention solves the problems in the prior art that the light-shielding material excessively pursues a high light-shielding rate, resulting in insufficient mechanical strength, toughness, and poor fluidity, and provides a light-shielding material that can be used in electronic, electrical, and electrical components.

[0007] One of the purposes of the present invention is to provide a light-shielding material, based on 100 parts by weight of the base resin, comprising the following components:

[0008] Base resin 100 parts by weight;

[0009] Crystalline polyester 0 - 50 parts by weight; preferably 1 - 30 parts by weight; more preferably 10 - 25 parts by weight;

[0010] Light-shielding agent pretreated with a surface functional agent

[0011] 0.1 - 50 parts by weight; preferably 0.3 - 36 parts by weight; more preferably 0.5 - 20 parts by weight;

[0012] Toughening agent 0.1 - 40 parts by weight; preferably 1 - 24 parts by weight; more preferably 5 - 15 parts by weight;

[0013] Flame retardant 0 - 2 parts by weight; preferably 0.2 - 1 part by weight; more preferably 0.5 - 0.8 part by weight;

[0014] UV-resistant agent 0 - 2.5 parts by weight; preferably 0.03 - 1.7 parts by weight; more preferably 0.3 - 0.6 part by weight;

[0015] Antioxidant 0.01 - 2.5 parts by weight; preferably 0.03 - 1.7 parts by weight; more preferably 0.3 - 0.6 part by weight.

[0016] In a preferred embodiment of the present invention,

[0017] The light-shielding agent is titanium dioxide or a composition comprising titanium dioxide and other functional aids; preferably,

[0018] The titanium dioxide is at least one of sulfuric acid process titanium dioxide, chloride process titanium dioxide, brookite titanium dioxide, rutile titanium dioxide, and anatase titanium dioxide;

[0019] The other functional aids are at least one of calcium carbonate, magnesium carbonate, barium sulfate, magnesium sulfate, calcium sulfate, silicon dioxide, calcium oxide, zirconium oxide, magnesium oxide, talc powder, kaolin, diatomaceous earth, bentonite, mica, wollastonite, and barite; the other functional aids preferably further include at least one of inorganic whiskers and organic whiskers;

[0020] The mass ratio of the titanium dioxide to the other functional additives is (5 to 100):(0 to 95), more preferably (5 to 95):(5 to 95), and most preferably (60 to 95):(5 to 40);

[0021] The surface functional agent is at least one of a silane coupling agent, a titanate coupling agent, an isocyanate coupling agent, and an epoxy resin type coupling agent, preferably at least one of 1,2-bis(triethoxysilyl)ethane, 3-aminopropylmethyldimethoxysilane, N-2-aminoethyl-3-aminopropylmethyldiethoxysilane, N-cyclohexyl-3-aminopropylmethyldimethoxysilane, N,N-diethyl-3-aminopropyltrimethoxysilane, 3-(1,3-dimethylbutenyl)aminopropyltriethoxysilane, tetra-isopropyl di(dioctylphosphite) titanate, isopropoxy trioleate titanate, 3-isocyanatopropyltriethoxysilane, 1,3,5-tris(trimethoxysilylpropyl) isocyanurate, and γ-(2,3-epoxypropoxy)propyltrimethoxysilane;

[0022] The mass of the surface functional agent is 0.05 to 5% of the mass of the opacifier, more preferably 0.1 to 2.5%, and most preferably 0.3 to 1%.

[0023] In a preferred embodiment of the present invention,

[0024] The titanium dioxide is a mixture of micron-sized titanium dioxide and nano-sized titanium dioxide;

[0025] The other functional additives are in the shape of spheres, rods or flakes;

[0026] The inorganic whiskers are at least one of alumina whiskers, magnesia whiskers, zinc oxide whiskers, calcium carbonate whiskers, calcium sulfate whiskers, silicon carbide whiskers, silicon nitride whiskers, potassium titanate whiskers, and aluminum borate whiskers;

[0027] The organic whiskers are at least one of cellulose whiskers, chitosan whiskers, chitin whiskers, and starch whiskers;

[0028] The preparation method of the opacifier pretreated with the surface functional agent includes: mixing the titanium dioxide and optionally other functional additives evenly, and then adding the surface functional agent and mixing evenly to obtain the combined opacifier pretreated with the surface functional agent; preferably, the addition method of the surface functional agent is dropwise addition.

[0029] In a preferred embodiment of the present invention,

[0030] The particle size of the micron-sized titanium dioxide is 1 to 60 microns, preferably 5 to 45 microns, and more preferably 10 to 30 microns;

[0031] The particle size of the nanoscale titanium dioxide is 10 to 990 nanometers, preferably 50 to 850 nanometers, and more preferably 100 to 600 nanometers;

[0032] The mass ratio of the micron-scale titanium dioxide to the nanoscale titanium dioxide is (0.1 to 1):1, and more preferably (0.25 to 0.75):1;

[0033] When the shape of the other functional additive is spherical, its particle size is 0.1 to 50 microns, preferably 0.5 to 35 microns, and more preferably 0.8 to 20 microns;

[0034] When the shape of the other functional additive is rod-shaped, its cross-sectional diameter is 0.5 to 10 microns, preferably 0.8 to 8 microns, and more preferably 1 to 8 microns; its length is 5 to 500 microns, preferably 10 to 400 microns, and more preferably 20 to 300 microns;

[0035] When the shape of the other functional additive is sheet-shaped, its thickness is 0.05 to 10 microns, preferably 0.1 to 8 microns, and more preferably 0.2 to 5 microns; its size is 0.5 to 100 microns, preferably 1 to 80 microns, and more preferably 2.5 to 60 microns.

[0036] In a preferred embodiment of the present invention,

[0037] The base resin is at least one of polyvinyl chloride, polystyrene, high impact polystyrene, acrylonitrile-butadiene-styrene resin (ABS), polycarbonate (PC), polyamide, polyimide, polyether amide, polyether imide, polyphenylene sulfide, polyphenylene ether; preferably at least one of styrene resin (ABS resin), polycarbonate, polyamide, polyphenylene ether; more preferably at least one of styrene resin (ABS resin), polycarbonate, polyamide;

[0038] The crystalline polyester is at least one of the following polymers and their copolyesters: polyethylene terephthalate, polybutylene terephthalate, poly(ethylene glycol terephthalate) glycol, poly(1,4-cyclohexanedimethanol terephthalate); the crystallinity of the crystalline polyester is 1 to 60%, preferably 5 to 45%, and more preferably 8 to 30%;

[0039] The toughening agent is at least one of a graft-type toughening agent, a core-shell type toughening agent, a block-type toughening agent, and a star-branched type toughening agent;

[0040] The flame retardant is at least one of silicone flame retardants, organic phosphorus-nitrogen flame retardants, and organic phosphorus flame retardants; preferably a composition of a silicone flame retardant and an organic phosphorus-nitrogen flame retardant; more preferably, the mass ratio of the silicone flame retardant to the organic phosphorus-nitrogen flame retardant is 1:(0.1-9), and most preferably 1:(0.3-1);

[0041] The UV absorber is at least one of benzophenone-based, benzotriazole-based, triazine-based, and acrylate-based UV absorbers;

[0042] The antioxidant is at least one of tris(nonylphenyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], n-octadecyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate, and 2,6-di-tert-butyl-4-methylphenol.

[0043] In a preferred embodiment of the present invention,

[0044] The graft-type toughening agent is at least one of the following polymers: ethylene / glycidyl acrylate copolymer, ethylene / methyl methacrylate / glycidyl acrylate copolymer, ethylene / glycidyl methacrylate copolymer, ethylene / methyl methacrylate / methyl glycidyl methacrylate copolymer, ethylene / maleic anhydride copolymer, ethylene / butene / maleic anhydride copolymer, ethylene / 1-octene / maleic anhydride copolymer, ethylene / butene / 1-octene / maleic anhydride copolymer, ethylene / methyl methacrylate / maleic anhydride copolymer;

[0045] The core-shell toughening agent consists of a core and a shell;

[0046] The block toughening agent is at least one of the following polymers: styrene-b-butadiene diblock copolymer, styrene-b-isoprene diblock copolymer, styrene-b-(butadiene-co-isoprene) diblock copolymer, (styrene-co-butadiene)-b-isoprene diblock copolymer, (styrene-co-isoprene)-b-butadiene diblock copolymer, (styrene-co-butadiene)-b-(styrene-co-isoprene) diblock copolymer, (styrene-co-butadiene)-b-(butadiene-co-isoprene) diblock copolymer, (styrene-co-isoprene)-b-(butadiene-co-isoprene) diblock copolymer, styrene-b-butadiene-b-styrene triblock copolymer, butadiene-b-styrene-b-butadiene triblock copolymer, styrene-b-isoprene-b-styrene triblock copolymer, isoprene-b-styrene-b-isoprene triblock copolymer, styrene-b-butadiene-b-isoprene triblock copolymer, styrene-b-isoprene-b-butadiene triblock copolymer, butadiene-b-styrene-b-isoprene triblock copolymer, styrene-b-(butadiene-co-isoprene)-b-styrene triblock copolymer, styrene-b-butadiene-b-isoprene-b-styrene tetrablock copolymer, butadiene-b-styrene-b-isoprene-b-butadiene tetrablock copolymer, isoprene-b-styrene-b-butadiene-b-isoprene tetrablock copolymer, butadiene-b-isoprene-b-styrene-b-isoprene-b-butadiene pentablock copolymer, isoprene-b-butadiene-b-styrene-b-butadiene-b-isoprene pentablock copolymer;

[0047] The star-branched toughening agent is at least one of the following polymers: star-branched polyester, star-branched polyurethane, star-branched polyether, star-branched polyamide, star-branched polyether amide, star-branched polybutadiene, star-branched polyisoprene, star-branched styrene / butadiene copolymer, star-branched styrene / isoprene copolymer, star-branched styrene / butadiene / isoprene copolymer;

[0048] The benzophenone UV absorber is at least one of benzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, 2-hydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,3,4-trihydroxybenzophenone, 4,4'-dihydroxybenzophenone;

[0049] The benzotriazole UV absorber is at least one of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-5-tert-octylphenyl)benzotriazole, and 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol;

[0050] The triazine UV absorber is at least one of 2,4,6-tris(2'-hydroxy-4'-n-butoxyphenyl)-1,3,5-triazine, 2,4-bis(4-biphenylyl)-6-(2-hydroxy-4-alkoxyphenyl)-1,3,5-triazine, 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxyphenol, and 2-[4,6-bis(2,4-xylyl)-2-(1,3,5-triazinyl)]-5-octyloxyphenol;

[0051] The acid ester UV absorber is at least one of phenyl salicylate, 2-ethylhexyl salicylate, 2,4-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate, hexyl diethylaminohydroxybenzoylbenzoate, tetraethyl 2,2'-(1,4-phenylenedimethylene)dimalonate, and pentaerythritol tetra(2-cyano-3,3-diphenylacrylate).

[0052] In a preferred embodiment of the present invention,

[0053] The core of the core-shell toughening agent is at least one of polybutadiene, polyisoprene, butadiene / styrene copolymer, isoprene / styrene copolymer, butadiene / isoprene / styrene copolymer, polyacrylate, olefin / acrylic ester copolymer, and olefin / methacrylate copolymer;

[0054] The shell of the core-shell toughening agent is at least one of polystyrene, polyacrylate, polymethacrylate, styrene / acrylic ester copolymer, styrene / methacrylate copolymer, and styrene / acrylic ester / methacrylate copolymer.

[0055] In a preferred embodiment of the present invention,

[0056] When the thickness of the light-shielding material > 1 mm, the total light transmittance < 0.50%;

[0057] When the thickness of the light-shielding material ≤ 1 mm, the total light transmittance < 0.85%.

[0058] A second object of the present invention is to provide a method for preparing a light-shielding material, including:

[0059] The components in the stated parts by weight are melt-mixed and extruded into pellets to obtain the light-shielding material; preferably,

[0060] First, the base resin, optional crystalline polyester, and toughening agent are mixed evenly to obtain mixture A, and the optional flame retardant, optional UV-resistant agent, and antioxidant are mixed evenly to obtain mixture B. Then, the obtained mixture A, mixture B, and the light-shielding agent pretreated with a surface functional agent are melt-mixed and extruded in a screw extruder, cooled, and pelletized to obtain the light-shielding material; more preferably,

[0061] The melt-mixing temperature is 220-300°C, preferably 250-275°C;

[0062] The rotation speed of the screw extruder is 50-500 rpm, preferably 150-400 rpm;

[0063] The total feeding rate of the mixed materials of mixture A, mixture B, and the light-shielding agent pretreated with a surface functional agent is 20-40 kg / h.

[0064] The third object of the present invention is to provide an application of the light-shielding material in electronic, electrical, and electrical components.

[0065] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0066] The light-shielding material prepared by the present invention solves the problems of insufficient mechanical strength, toughness, and fluidity caused by the pursuit of high light-shielding rate in the prior art through the synergistic effect among the components.

[0067] After the surface functionalization treatment of the light-shielding agent, it can not only form an interfacial compatibility with the base resin and crystalline polyester, improving the compatibility of the light-shielding material system, but also solve the problems of self-adhesion and agglomeration; the light-shielding agents with different particle sizes and different shapes such as spherical, flaky, and whisker-shaped are stacked and arranged with each other to form an effective light-shielding network.

[0068] The introduced crystalline polyester can form a microcrystalline phase region structure in the base resin composite system, and the light-shielding agent can also be encapsulated inside to block the light transmission; in addition, the toughening agent and UV-resistant agent endow the light-shielding material with excellent impact toughness and UV aging resistance. When the thickness of the obtained light-shielding material > 1 mm, the total light transmittance < 0.50%, and when the thickness ≤ 1 mm, the total light transmittance < 0.85%, achieving good technical effects. Detailed embodiments

[0069] The present invention is described in detail below in conjunction with specific embodiments. It is necessary to point out that the following embodiments are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by those skilled in the art based on the contents of the present invention still fall within the scope of protection of the present invention.

[0070] The raw materials used in the examples and comparative examples, unless otherwise specified, are disclosed in the prior art, for example, they can be directly purchased or prepared according to the preparation methods disclosed in the prior art.

[0071] PC: MFR (300°C, 1.2kg) 10g / 10min, Covestro;

[0072] ABS: MFR (250℃, 2.16kg) 25g / 10min, Sinopec Gaoqiao Petrochemical Company;

[0073] Polyamide 66: relative viscosity 3.19, DuPont;

[0074] Polybutylene terephthalate: intrinsic viscosity 0.89, crystallinity 45%, Sinopec Yizheng Chemical Fiber Company;

[0075] Poly(1,4-cyclohexyl dimethanol terephthalate): intrinsic viscosity 0.75, crystallinity 30%, Eastman Chemical Company, USA;

[0076] 1,2-Bis(triethoxysilyl)ethane: Nanjing Youpu Chemical Co., Ltd.;

[0077] Rutile titanium dioxide A: particle size 500 nanometers, Shanghai Yifu Industrial Co., Ltd.

[0078] Rutile titanium dioxide B: particle size 100 nm, Shanghai Yifu Industrial Co., Ltd.;

[0079] Anatase titanium dioxide A: particle size 15 μm, Yunnan Dahutong Industry and Trade Company;

[0080] Anatase titanium dioxide B: particle size 30 μm, Yunnan Dahutong Industry and Trade Company;

[0081] Mica: size 20 microns, thickness 0.5 microns, Changzhou Lehuan Trading Company;

[0082] Barium sulfate: particle size 0.8 μm, Tianjin Jinhui Chemical Reagent Company;

[0083] Zinc oxide whiskers: 35 microns in length and 2 microns in diameter, from Qinghe Ruijiang Metal Materials Company;

[0084] Chitosan whiskers: 60 microns in length and 5 microns in diameter, from Xi'an Qiyue Biotechnology Co., Ltd.

[0085] Ethylene / butene / 1-octene / maleic anhydride copolymer: Dongguan Haopinfafa Plastic Co., Ltd.;

[0086] Core is polybutadiene - shell is styrene / methacrylate copolymer: Nippon Zeon Co., Ltd.;

[0087] Butadiene-b-styrene-b-butadiene triblock copolymer: Styrene content 25%, Sinopec Yanshan Petrochemical Company;

[0088] Polybutadiene / styrene / methacrylate copolymer: Shanghai Yiji Industrial Co., Ltd.;

[0089] Organic silicon flame retardant: Dongguan Zhenming Chemical Co., Ltd.;

[0090] Melamine polyphosphate: Kejufu New Materials Co., Ltd.;

[0091] Tetraethyl 2,2'-(1,4-phenylenedimethylene)dimalonate: Nanjing Milan Chemical Co., Ltd.

[0092] Pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]: Ciba, Switzerland.

[0093] The properties of the present invention are measured by the following methods:

[0094] Melt flow rate (MFR) test: Measured according to ISO 1133 standard.

[0095] Izod impact strength test: Measured according to ISO 179 standard, pendulum energy 5 J.

[0096] Flexural modulus test: Measured according to ISO 178 standard, speed 2 mm / min.

[0097] Total light transmittance test: Measured according to ASTM D1003 standard, thickness 0.8 - 1.6 mm.

[0098] Flame retardancy test: Measured according to UL94 standard, thickness 1.5 mm.

[0099] UV aging resistance test: Measured according to ISO 4892-2 standard, aging temperature 60 °C, wavelength 340 nm.

[0100] The parts in the examples and comparative examples all refer to parts by weight.

[0101]

Example 1

[0102] Pretreatment of the light-shielding agent: Add 30 kg of rutile titanium dioxide A, 6 kg of anatase titanium dioxide A, 7.5 kg of barium sulfate, and 1.5 kg of mica to a stirring kettle at 50 °C. Stir at 500 revolutions per minute for 3 minutes, then dropwise add 200 g of 1,2-bis(triethoxysilyl)ethane, and continue to stir at 800 revolutions per minute for 5 minutes. Let it stand for later use, denoted as ZG1. (It is necessary to add the same proportion without pretreatment and the same proportion with the titanium dioxide component content less than or equal to 1)

[0103] Preparation of the light-shielding material: Place 60 kg of dried PC, 30 kg of ABS, 10 kg of polybutylene terephthalate, and 5 kg of a core-shell polymer with a core of polybutadiene and a shell of styrene / methacrylate copolymer in a stainless steel stirrer and stir to mix evenly. Feed it into a ZE25 UTXi type co-rotating twin-screw extruder (screw diameter 25 mm, length-diameter ratio 56); Place 0.5 kg of silicone flame retardant, 0.35 kg of tetraethyl 2,2'-(1,4-phenylenedimethylene)dimalonate, and 0.4 kg of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] in a mixer and mix evenly, then feed it into the twin-screw extruder; Feed 10 kg of the pretreated ZG1 into the twin-screw extruder; Under the conditions of 260 °C, 300 revolutions per minute, and a total feeding rate of 25 kg / hour, carry out melt kneading and extrusion, cooling, and pelletizing to obtain the light-shielding material A. Its comprehensive properties are shown in Table 1.

[0104]

Example 2

[0105] Preparation of the light-shielding material: Place 63 kg of dried PC, 31.5 kg of ABS, 10.5 kg of polybutylene terephthalate, and 5 kg of a core-shell polymer with a core of polybutadiene and a shell of styrene / methacrylate copolymer in a stainless steel stirrer and stir to mix evenly. Feed it into a ZE25 UTXi type co-rotating twin-screw extruder (screw diameter 25 mm, length-diameter ratio 56); Place 0.5 kg of silicone flame retardant, 0.35 kg of tetraethyl 2,2'-(1,4-phenylenedimethylene)dimalonate, and 0.4 kg of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] in a mixer and mix evenly, then feed it into the twin-screw extruder; Feed 15 kg of the pretreated ZG1 into the twin-screw extruder; Under the conditions of 260 °C, 300 revolutions per minute, and a total feeding rate of 25 kg / hour, carry out melt kneading and extrusion, cooling, and pelletizing to obtain the light-shielding material B. Its comprehensive properties are shown in Table 1.

[0106]

Example 3

[0107] Preparation of the light-shielding material: 65.7 kg of dried PC, 32.85 kg of ABS, 10.95 kg of polybutylene terephthalate, and 5 kg of a polybutadiene core - styrene / methacrylate copolymer shell were placed in a stainless - steel stirrer and stirred evenly, then fed into a ZE25 UTXi type co - rotating twin - screw extruder (screw diameter 25 mm, length - to - diameter ratio 56); 0.5 kg of silicone flame retardant, 0.35 kg of tetraethyl 2,2'-(1,4 - phenylenedimethylene) dipropanedioate, and 0.4 kg of pentaerythritol tetra[β-(3,5 - di - tert - butyl - 4 - hydroxyphenyl) propionate] were placed in a mixer and mixed evenly, then fed into the twin - screw extruder; 0.5 kg of pretreated ZG1 was fed into the twin - screw extruder; under the conditions of 260 °C, 300 revolutions per minute, and a total feeding rate of 25 kg / h, it was melt - kneaded and extruded, cooled, and pelletized to obtain the light - shielding material C. Its comprehensive properties are shown in Table 1.

[0108]

Example 4

[0109] Preparation of the light - shielding material: 57 kg of dried PC, 28.5 kg of ABS, 9.5 kg of polybutylene terephthalate, and 5 kg of a polybutadiene core - styrene / methacrylate copolymer shell were placed in a stainless - steel stirrer and stirred evenly, then fed into a ZE25 UTXi type co - rotating twin - screw extruder (screw diameter 25 mm, length - to - diameter ratio 56); 0.5 kg of silicone flame retardant, 0.35 kg of tetraethyl 2,2'-(1,4 - phenylenedimethylene) dipropanedioate, and 0.4 kg of pentaerythritol tetra[β-(3,5 - di - tert - butyl - 4 - hydroxyphenyl) propionate] were placed in a mixer and mixed evenly, then fed into the twin - screw extruder; 15 kg of pretreated ZG1 was fed into the twin - screw extruder; under the conditions of 260 °C, 300 revolutions per minute, and a total feeding rate of 25 kg / h, it was melt - kneaded and extruded, cooled, and pelletized to obtain the light - shielding material D. Its comprehensive properties are shown in Table 1.

[0110]

Comparative Example 1

[0111] Preparation of alloy material: 60 kg of dried PC, 30 kg of ABS, 10 kg of polybutylene terephthalate, and 5 kg of a core-shell polymer with a polybutadiene core and a styrene / methacrylate copolymer shell were placed in a stainless-steel stirrer and stirred evenly, then fed into a ZE25 UTXi type co-rotating twin-screw extruder (screw diameter 25 mm, length-diameter ratio 56); 0.5 kg of silicone flame retardant, 0.35 kg of tetraethyl 2,2'-(1,4-phenylenedimethylene) dipropanedioate, and 0.4 kg of pentaerythritol tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] were placed in a mixer and mixed evenly, then fed into the twin-screw extruder; at 260 °C, 300 rpm, and a total feeding rate of 25 kg / h, through melt kneading and extrusion, cooling, and pelletizing, light-shielding material i was obtained. Its comprehensive properties are shown in Table 1.

[0112]

Comparative Example 2

[0113] According to the method in Chinese invention patent CN103333453A (invention name: "A high-light-shielding ABS composite material and its preparation method"), the light-shielding material was prepared, and the specific steps are as follows:

[0114] Pretreatment of light-shielding agent: 20 kg of rutile titanium dioxide A, 30 kg of barium sulfate, 5 kg of styrene-butadiene copolymer, 2 kg of ABS high rubber powder, 0.15 kg of antioxidant 1010, 0.15 kg of antioxidant 1076, 0.15 kg of 2-(2H-benzotriazol-2-yl)-p-cresol, 0.15 kg of bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, 0.16 kg of magnesium stearate, 0.24 kg of ethylene bisstearamide, and 0.9 kg of coupling agent KH570 were added to a stirring kettle, put into a stirrer and stirred evenly, the stirring speed was 150 rpm, and the time was 1.5 minutes, denoted as ZG0.

[0115] Preparation of light-shielding material: 60 kg of dried PC, 30 kg of ABS, and 10 kg of polybutylene terephthalate were placed in a stainless-steel stirrer and stirred evenly, then fed into a ZE25 UTXi type co-rotating twin-screw extruder (screw diameter 25 mm, length-diameter ratio 56); 10 kg of pretreated ZG0 was fed into the twin-screw extruder; at 260 °C, 300 rpm, and a total feeding rate of 25 kg / h, through melt kneading and extrusion, cooling, and pelletizing, light-shielding material ii was obtained. Its comprehensive properties are shown in Table 1.

[0116]

Comparative Example 3

[0117] Preparation of the light-shielding material: 66.7 kg of dried PC, 33.3 kg of ABS, and 5 kg of a core-shell polymer with a polybutadiene core and a styrene / methacrylate copolymer shell were placed in a stainless-steel stirrer and stirred evenly, and then fed into a ZE25 UTXi type co-rotating twin-screw extruder (screw diameter 25 mm, length-diameter ratio 56); 0.5 kg of silicone flame retardant, 0.35 kg of tetraethyl 2,2'-(1,4-phenylenedimethylene) dipropanedioate, and 0.4 kg of pentaerythritol tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] were placed in a mixer and mixed evenly, and then fed into the twin-screw extruder; 10 kg of pretreated ZG1 was fed into the twin-screw extruder; under the conditions of 260 °C, 300 rpm, and a total feeding rate of 25 kg / h, it was melt-kneaded and extruded, cooled, and pelletized to obtain the light-shielding material iii. Its comprehensive performance is shown in Table 1.

[0118] Table 1 Performance test results of Examples 1-4 and Comparative Examples 1-3

[0119]

[0120]

[0121] Compared with Example 1, no light-shielding agent was added in Comparative Example 1; the treatment method of the light-shielding agent in Comparative Example 2 was different, and other auxiliary components were all added to the light-shielding agent. The mass ratio of titanium dioxide to barium sulfate in the light-shielding agent was 1:1.5. No crystalline polyester was added in Comparative Example 3.

[0122] From the comparison of the performance test indexes of Examples 1-4 in Table 1, through the types, compositions, contents of the light-shielding agents and the appropriate ratios with toughening agents, flame retardants, and anti-UV aging agents, a light-shielding material with excellent impact resistance, high mechanical modulus, high light-shielding rate, and flame retardancy can be prepared. Light-shielding agents with different particle sizes and flaky mica form a spatial network structure, effectively blocking the light transmission; after 1080 hours of UV aging, the mechanical property retention rate of the light-shielding material is as high as over 94%; compared with Comparative Example 1, the light-shielding effect is significant after adding the light-shielding agent ZG1 in Example 1; compared with Comparative Example 3, introducing high-crystallinity polyester into amorphous polycarbonate, ABS and other materials, and using its crystallization characteristics can form microcrystalline phase regions in the composite matrix, which is beneficial to improving the light-shielding performance; compared with Comparative Example 2, this invention patent shows obvious technical advantages.

[0123]

Example 5

[0124] Pretreatment of the light-shielding agent: Add 40 kg of anatase titanium dioxide A, 5 kg of zinc oxide whiskers, and 5 kg of mica to a stirring kettle at 50 °C, stir for 3 minutes at 500 revolutions per minute, dropwise add 300 g of 1,2-bis(triethoxysilyl)ethane, continue to stir for 5 minutes at 800 revolutions per minute, let stand and reserve, denoted as ZG2.

[0125] Preparation of the light-shielding material: Place 80 kg of dried polyamide 66, 20 kg of poly(1,4-cyclohexanedimethylene terephthalate), and 10 kg of ethylene / butene / 1-octene / maleic anhydride copolymer in a stainless steel stirrer and stir to mix evenly, then feed it into a ZE25 UTXi type co-rotating twin-screw extruder (screw diameter 25 mm, length-diameter ratio 56); Place 0.25 kg of silicone flame retardant, 0.15 kg of melamine polyphosphate, 0.3 kg of tetraethyl 2,2'-(1,4-phenylenedimethylene)dimalonate, and 0.35 kg of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] in a mixer and mix evenly, then feed it into the twin-screw extruder; Feed 12 kg of the pretreated ZG2 into the twin-screw extruder; Under the conditions of 265 °C, 350 revolutions per minute, and a total feeding rate of 30 kg / hour, carry out melt kneading and extrusion, cooling, and pelletizing to obtain the light-shielding material E. Its comprehensive properties are shown in Table 2.

[0126]

Example 6

[0127] Pretreatment of the light-shielding agent: Add 40 kg of anatase titanium dioxide A, 5 kg of chitin whiskers, and 5 kg of mica to a stirring kettle at 50 °C, stir for 3 minutes at 500 revolutions per minute, dropwise add 300 g of 1,2-bis(triethoxysilyl)ethane, continue to stir for 5 minutes at 800 revolutions per minute, let stand and reserve, denoted as ZG3.

[0128] Preparation of the light-shielding material: Place 80 kg of dried polyamide 66, 20 kg of poly(1,4-cyclohexanedimethylene terephthalate), and 10 kg of ethylene / butene / 1-octene / maleic anhydride copolymer in a stainless steel stirrer and stir to mix evenly, then feed it into a ZE25 UTXi type co-rotating twin-screw extruder (screw diameter 25 mm, length-diameter ratio 56); Place 0.25 kg of silicone flame retardant, 0.15 kg of melamine polyphosphate, 0.3 kg of tetraethyl 2,2'-(1,4-phenylenedimethylene)dimalonate, and 0.35 kg of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] in a mixer and mix evenly, then feed it into the twin-screw extruder; Feed 12 kg of the pretreated ZG3 into the twin-screw extruder; Under the conditions of 265 °C, 350 revolutions per minute, and a total feeding rate of 30 kg / hour, carry out melt kneading and extrusion, cooling, and pelletizing to obtain the light-shielding material F. Its comprehensive properties are shown in Table 2.

[0129]

Example 7

[0130] Preparation of the light-shielding material: 80 kg of dried polyamide 66, 20 kg of poly(1,4-cyclohexanedimethylene terephthalate), and 10 kg of ethylene / butene / 1-octene / maleic anhydride copolymer were placed in a stainless-steel stirrer and stirred and mixed evenly, and then fed into a ZE25 UTXi type co-rotating twin-screw extruder (screw diameter 25 mm, length-diameter ratio 56); 0.25 kg of silicone flame retardant, 0.15 kg of melamine polyphosphate, 0.3 kg of tetraethyl 2,2'-(1,4-phenylenedimethylene)dimalonate, and 0.35 kg of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] were placed in a mixer and mixed evenly, and then fed into the twin-screw extruder; 6 kg of pretreated ZG2 and 6 kg of ZG3 were fed into the twin-screw extruder; at 265 °C, 350 rpm, and a total feeding rate of 30 kg / h, it was melt-kneaded and extruded, cooled, and pelletized to obtain the light-shielding material G. Its comprehensive properties are shown in Table 2.

[0131]

Example 8

[0132] Preparation of the light-shielding material: 80 kg of dried polyamide 66, 20 kg of poly(1,4-cyclohexanedimethylene terephthalate), and 10 kg of ethylene / butene / 1-octene / maleic anhydride copolymer were placed in a stainless-steel stirrer and stirred and mixed evenly, and then fed into a ZE25 UTXi type co-rotating twin-screw extruder (screw diameter 25 mm, length-diameter ratio 56); 0.25 kg of silicone flame retardant, 0.15 kg of melamine polyphosphate, 0.3 kg of tetraethyl 2,2'-(1,4-phenylenedimethylene)dimalonate, and 0.35 kg of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] were placed in a mixer and mixed evenly, and then fed into the twin-screw extruder; 8 kg of pretreated ZG1 and 4 kg of ZG3 were fed into the twin-screw extruder; at 265 °C, 350 rpm, and a total feeding rate of 30 kg / h, it was melt-kneaded and extruded, cooled, and pelletized to obtain the light-shielding material H. Its comprehensive properties are shown in Table 2.

[0133]

Comparative Example 4

[0134] The toughening agent A-664 type acrylate rubber copolymer in Example 6 of Chinese invention patent CN107216635A (invention name: "A high-light-shielding polycarbonate filament material suitable for fused deposition and its preparation method") was used.

[0135] The specific preparation method of Comparative Example 4 is as follows:

[0136] Preparation of light-shielding material: 80 kg of dried polyamide 66, 20 kg of poly(1,4-cyclohexanedimethylene terephthalate), and 10 kg of toughening agent acrylate rubber copolymer A-664 were placed in a stainless-steel stirrer and stirred and mixed evenly, and then fed into a ZE25 UTXi type co-rotating twin-screw extruder (screw diameter 25 mm, length-diameter ratio 56); 0.25 kg of silicone flame retardant, 0.15 kg of melamine polyphosphate, 0.3 kg of tetraethyl 2,2'-(1,4-phenylenedimethylene)dimalonate, and 0.35 kg of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] were placed in a mixer and mixed evenly, and then fed into the twin-screw extruder; 8 kg of pretreated ZG1 and 4 kg of ZG3 were fed into the twin-screw extruder; under the conditions of 265 °C, 350 rpm, and a total feeding rate of 30 kg / h, it was melt-kneaded and extruded, cooled, and pelletized to obtain light-shielding material iv. Its comprehensive performance is shown in Table 2.

[0137]

Comparative Example 5

[0138] Preparation of light-shielding material: 100 kg of dried polyamide 66 and 10 kg of ethylene / butene / 1-octene / maleic anhydride copolymer were placed in a stainless-steel stirrer and stirred and mixed evenly, and then fed into a ZE25 UTXi type co-rotating twin-screw extruder (screw diameter 25 mm, length-diameter ratio 56); 0.25 kg of silicone flame retardant, 0.15 kg of melamine polyphosphate, 0.3 kg of tetraethyl 2,2'-(1,4-phenylenedimethylene)dimalonate, and 0.35 kg of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] were placed in a mixer and mixed evenly, and then fed into the twin-screw extruder; 8 kg of pretreated ZG1 and 4 kg of ZG3 were fed into the twin-screw extruder; under the conditions of 265 °C, 350 rpm, and a total feeding rate of 30 kg / h, it was melt-kneaded and extruded, cooled, and pelletized to obtain light-shielding material v. Its comprehensive performance is shown in Table 2.

[0139] Table 2 Performance test results of Examples 5-8 and Comparative Examples 4-5

[0140]

[0141] Compared with Example 8, the toughening agent in Comparative Example 4 was different, which was polybutadiene / styrene / methacrylate copolymer; and no crystalline polyester was added in Example 5.

[0142] As can be seen from Table 2, compared with Comparative Example 4, Example 8 has higher impact resistance, higher mechanical modulus, better flame retardant effect, better impact retention rate and modulus retention rate after UV aging, proving that the toughening agent used in the present invention has better effect. Compared with Comparative Example 5, Example 8 has better light-shielding performance, higher impact resistance, higher mechanical modulus, better flame retardant effect, better impact retention rate and modulus retention rate after UV aging, proving that the addition of crystalline polyester can synergistically cooperate with the matrix resin to effectively improve various properties.

[0143]

Example 9

[0144] Pretreatment of light-shielding agent: Add 50 kg of rutile titanium dioxide A to a stirring kettle at 50 °C, stir at 500 rpm for 3 minutes, dropwise add 450 g of 1,2-bis(triethoxysilyl)ethane, continue to stir at 800 rpm for 5 minutes, let stand and reserve, denoted as ZG4.

[0145] Preparation of light-shielding material: Put 100 kg of dried ABS and 7.5 kg of butadiene-b-styrene-b-butadiene triblock copolymer into a stainless steel stirrer and stir and mix evenly, then feed them into a ZE25 UTXi type co-rotating twin-screw extruder (screw diameter 25 mm, length-diameter ratio 56); put 0.5 kg of melamine polyphosphate, 0.5 kg of tetraethyl 2,2'-(1,4-phenylenedimethylene)dimalonate and 0.5 kg of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] into a mixer and mix evenly, then feed them into the twin-screw extruder; put 7 kg of pretreated ZG4 into the twin-screw extruder; under the conditions of 250 °C, 400 rpm and a total feeding rate of 35 kg / h, carry out melt kneading and extrusion, cooling and pelletizing to obtain light-shielding material I. Its comprehensive performance is shown in Table 3.

[0146]

Example 10

[0147] Pretreatment of light-shielding agent: Add 35 kg of rutile titanium dioxide A and 15 kg of mica to a stirring kettle at 50 °C, stir at 500 rpm for 3 minutes, dropwise add 450 g of 1,2-bis(triethoxysilyl)ethane, continue to stir at 800 rpm for 5 minutes, let stand and reserve, denoted as ZG5.

[0148] Preparation of light-shielding material: 100 kg of dried ABS and 7.5 kg of butadiene-b-styrene-b-butadiene triblock copolymer are placed in a stainless-steel stirrer, stirred and mixed evenly, and fed into a ZE25 UTXi type co-rotating twin-screw extruder (screw diameter 25 mm, length-diameter ratio 56); 0.5 kg of melamine polyphosphate, 0.5 kg of tetraethyl 2,2'-(1,4-phenylenedimethylene) dipropanedioate, and 0.5 kg of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] are placed in a mixer, mixed evenly, and fed into the twin-screw extruder; 7 kg of pretreated ZG5 is fed into the twin-screw extruder; under the conditions of 250 °C, 400 rpm, and a total feeding rate of 35 kg / h, it is melt-kneaded and extruded, cooled, and pelletized to obtain light-shielding material J. Its comprehensive properties are shown in Table 3.

[0149]

Example 11

[0150] Pretreatment of light-shielding agent: 5 kg of rutile-type titanium dioxide A and 45 kg of mica are added to a 50-degree stirring kettle, stirred at 500 rpm for 3 minutes, 450 g of 1,2-bis(triethoxysilyl)ethane is added dropwise, and stirring is continued at 800 rpm for 5 minutes, then left standing for standby, denoted as ZG6.

[0151] Preparation of light-shielding material: 100 kg of dried ABS and 7.5 kg of butadiene-b-styrene-b-butadiene triblock copolymer are placed in a stainless-steel stirrer, stirred and mixed evenly, and fed into a ZE25 UTXi type co-rotating twin-screw extruder (screw diameter 25 mm, length-diameter ratio 56); 0.5 kg of melamine polyphosphate, 0.5 kg of tetraethyl 2,2'-(1,4-phenylenedimethylene) dipropanedioate, and 0.5 kg of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] are placed in a mixer, mixed evenly, and fed into the twin-screw extruder; 7 kg of pretreated ZG6 is fed into the twin-screw extruder; under the conditions of 250 °C, 400 rpm, and a total feeding rate of 35 kg / h, it is melt-kneaded and extruded, cooled, and pelletized to obtain light-shielding material K. Its comprehensive properties are shown in Table 3.

[0152]

Example 12

[0153] Pretreatment of light-shielding agent: 35 kg of rutile-type titanium dioxide B (100 nm), 12.5 kg of anatase-type titanium dioxide B (30 μm), and 2.5 kg of mica are added to a 50-degree stirring kettle, stirred at 500 rpm for 3 minutes, 500 g of 1,2-bis(triethoxysilyl)ethane is added dropwise, and stirring is continued at 800 rpm for 5 minutes, then left standing for standby, denoted as ZG7.

[0154] Preparation of the light-shielding material: 100 kg of dried ABS and 7.5 kg of butadiene-b-styrene-b-butadiene triblock copolymer were placed in a stainless-steel stirrer, stirred and mixed evenly, and fed into a ZE25 UTXi type co-rotating twin-screw extruder (screw diameter 25 mm, length-diameter ratio 56); 0.5 kg of melamine polyphosphate, 0.5 kg of tetraethyl 2,2'-(1,4-phenylenedimethylene) dipropanedioate, and 0.5 kg of pentaerythritol tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] were placed in a mixer, mixed evenly, and fed into the twin-screw extruder; 7 kg of pretreated ZG7 was fed into the twin-screw extruder; under the conditions of 250 °C, 400 rpm, and a total feeding rate of 35 kg / h, it was melt-kneaded and extruded, cooled, and pelletized to obtain the light-shielding material L. Its comprehensive properties are shown in Table 3.

[0155]

Comparative Example 6

[0156] Pretreatment of the light-shielding agent: 50 kg of mica was added to a stirring kettle at 50 °C, stirred at 500 rpm for 3 minutes, 450 g of 1,2-bis(triethoxysilyl)ethane was added dropwise, and stirring was continued at 800 rpm for 5 minutes, then left standing for later use, denoted as ZG8.

[0157] Preparation of the light-shielding material: 100 kg of dried ABS and 7.5 kg of butadiene-b-styrene-b-butadiene triblock copolymer were placed in a stainless-steel stirrer, stirred and mixed evenly, and fed into a ZE25 UTXi type co-rotating twin-screw extruder (screw diameter 25 mm, length-diameter ratio 56); 0.5 kg of melamine polyphosphate, 0.5 kg of tetraethyl 2,2'-(1,4-phenylenedimethylene) dipropanedioate, and 0.5 kg of pentaerythritol tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] were placed in a mixer, mixed evenly, and fed into the twin-screw extruder; 7 kg of pretreated ZG8 was fed into the twin-screw extruder; under the conditions of 250 °C, 400 rpm, and a total feeding rate of 35 kg / h, it was melt-kneaded and extruded, cooled, and pelletized to obtain the light-shielding material M. Its comprehensive properties are shown in Table 3.

[0158] Table 3 Performance test results of Examples 9-12 and Comparative Example 6

[0159]

[0160] Compared with Examples 9-12, the light-shielding agent in Comparative Example 6 does not contain titanium dioxide and only uses mica.

[0161] As can be seen from Table 3, compared with Comparative Example 6, Examples 9 to 12 have better light-shielding performance, higher impact resistance, higher mechanical modulus, better impact retention rate and modulus retention rate after UV aging, which proves that the light-shielding agents in the present invention, the light-shielding agents with different shapes and structures form a spatial network structure, which can effectively block the light transmission. After 1080 hours of UV aging, the mechanical property retention rate of the light-shielding material is as high as over 92.4%, which is not only better than the mica light-shielding agent without titanium dioxide, but also better than the light-shielding agent with the combination of titanium dioxide and mica compared to the light-shielding agent with only titanium dioxide.

[0162] The light-shielding materials prepared in Examples 1 to 12 have good light-shielding performance, high impact resistance, high mechanical modulus, good impact retention rate and modulus retention rate after UV aging. When the thickness of the obtained light-shielding material > 1 mm, the total light transmittance < 0.50%, and when the thickness ≤ 1 mm, the total light transmittance < 0.85%, achieving good technical effects.

Claims

1. A light-shielding material, based on 100 parts by weight of a base resin, comprises the following components: Base resin 100 parts by weight; Crystalline polyester 0 - 50 parts by weight; preferably 1 - 30 parts by weight; more preferably 10 - 25 parts by weight; Light-shielding agent pretreated with a surface functional agent 0.1 - 50 parts by weight; preferably 0.3 - 36 parts by weight; more preferably 0.5 - 20 parts by weight; Toughening agent 0.1 - 40 parts by weight; preferably 1 - 24 parts by weight; more preferably 5 - 15 parts by weight; Flame retardant 0 - 2 parts by weight; preferably 0.2 - 1 part by weight; more preferably 0.5 - 0.8 part by weight; UV-resistant agent 0 - 2.5 parts by weight; preferably 0.03 - 1.7 parts by weight; more preferably 0.3 - 0.6 part by weight; Antioxidant 0.01 - 2.5 parts by weight; preferably 0.03 - 1.7 parts by weight; more preferably 0.3 - 0.6 part by weight.

2. The light-shielding material according to claim 1, characterized in that: The light-shielding agent is titanium dioxide or a composition comprising titanium dioxide and other functional additives; preferably, the titanium dioxide is selected from at least one of sulfuric acid process titanium dioxide, chloride process titanium dioxide, brookite titanium dioxide, rutile titanium dioxide, anatase titanium dioxide; and / or, the other functional additives are at least one of calcium carbonate, magnesium carbonate, barium sulfate, magnesium sulfate, calcium sulfate, silicon dioxide, calcium oxide, zirconium oxide, magnesium oxide, talc, kaolin, diatomaceous earth, bentonite, mica, bronzite, barite; the other functional additives preferably further comprise at least one of inorganic whiskers and organic whiskers; and / or, the mass ratio of the titanium dioxide to the other functional additives is (5 - 100):(0 - 95), more preferably (5 - 95):(5 - 95), most preferably (60 - 95):(5 - 40); and / or, The surface functional agent is at least one of silane coupling agent, titanate coupling agent, isocyanate coupling agent, epoxy resin type coupling agent; preferably at least one of 1,2-bis(triethoxysilyl)ethane, 3-aminopropylmethyldimethoxysilane, N-2-aminoethyl-3-aminopropylmethyldiethoxysilane, N-cyclohexyl-3-aminopropylmethyldimethoxysilane, N,N-diethyl-3-aminopropyltrimethoxysilane, 3-(1,3-dimethylbutene)aminopropyltriethoxysilane, tetra-isopropyl di(dioctylphosphite) titanate, isopropoxy trioleate titanate, 3-isocyanatopropyltriethoxysilane, 1,3,5-tris(trimethoxysilylpropyl)isocyanurate, γ-(2,3-epoxypropoxy)propyltrimethoxysilane; and / or, The mass of the surface functional agent is 0.05 - 5% of the mass of the light-shielding agent, more preferably 0.1 - 2.5%, most preferably 0.3 - 1%.

3. The light-shielding material according to claim 2, characterized in that: The titanium dioxide is a mixture of micron-sized titanium dioxide and nano-sized titanium dioxide; and / or, The shape of the other functional additives is spherical, rod-shaped or flaky; and / or, The inorganic whiskers are at least one of aluminum oxide whiskers, magnesium oxide whiskers, zinc oxide whiskers, calcium carbonate whiskers, calcium sulfate whiskers, silicon carbide whiskers, silicon nitride whiskers, potassium titanate whiskers, and aluminum borate whiskers; and / or, The organic whiskers are at least one of cellulose whiskers, chitosan whiskers, chitin whiskers, and starch whiskers; and / or, The preparation method of the light-shielding agent pretreated with a surface functional agent includes: uniformly mixing titanium dioxide and optional other functional aids, and then adding the surface functional agent, and uniformly mixing to obtain the combined light-shielding agent pretreated with the surface functional agent; preferably, the addition method of the surface functional agent is dropwise addition.

4. The light-shielding material according to claim 3, characterized in that: The particle size of the micron-sized titanium dioxide is 1 to 60 microns, preferably 5 to 45 microns, and more preferably 10 to 30 microns; and / or, The particle size of the nano-sized titanium dioxide is 10 to 990 nanometers, preferably 50 to 850 nanometers, and more preferably 100 to 600 nanometers; and / or, The mass ratio of the micron-sized titanium dioxide to the nano-sized titanium dioxide is (0.1 to 1):1, and more preferably (0.25 to 0.75):1; and / or, When the shape of the other functional aid is spherical, its particle size is 0.1 to 50 microns, preferably 0.5 to 35 microns, and more preferably 0.8 to 20 microns; and / or, When the shape of the other functional aid is rod-shaped, its cross-sectional diameter is 0.5 to 10 microns, preferably 0.8 to 8 microns, and more preferably 1 to 8 microns; its length is 5 to 500 microns, preferably 10 to 400 microns, and more preferably 20 to 300 microns; and / or, When the shape of the other functional aid is sheet-shaped, its thickness is 0.05 to 10 microns, preferably 0.1 to 8 microns, and more preferably 0.2 to 5 microns; its size is 0.5 to 100 microns, preferably 1 to 80 microns, and more preferably 2.5 to 60 microns.

5. The light-shielding material according to claim 1, characterized in that: The base resin is at least one of polyvinyl chloride, polystyrene, high impact polystyrene, acrylonitrile-butadiene-styrene resin, polycarbonate, polyamide, polyimide, polyether amide, polyether imide, polyphenylene sulfide, and polyphenylene ether; and / or, The crystalline polyester is at least one of the following polymers and their copolyesters: polyethylene terephthalate, polybutylene terephthalate, poly(ethylene glycol) terephthalate, poly(bisphenol A) terephthalate, and poly(1,4-cyclohexanedimethanol) terephthalate; and / or, The toughening agent is at least one of a graft-type toughening agent, a core-shell type toughening agent, a block-type toughening agent, and a star-branched type toughening agent; and / or, The flame retardant is at least one of an organosilicon flame retardant, an organic phosphorus-nitrogen flame retardant, and an organic phosphorus flame retardant; preferably, it is a composition of an organosilicon flame retardant and an organic phosphorus-nitrogen flame retardant; more preferably, the mass ratio of the organosilicon flame retardant to the organic phosphorus-nitrogen flame retardant is 1:(0.1 to 9), and most preferably 1:(0.3 to 1); and / or, The anti-UV agent is at least one of benzophenone-based, benzotriazole-based, triazine-based, and acid ester-based anti-UV agents; and / or, The antioxidant is at least one of tris(nonylphenyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], n-octadecyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate, and 2,6-di-tert-butyl-4-methylphenol.

6. The light-shielding material according to claim 5, characterized in that: The graft-type toughening agent is at least one of the following polymers: ethylene / glycidyl acrylate copolymer, ethylene / methyl methacrylate / glycidyl acrylate copolymer, ethylene / glycidyl methacrylate copolymer, ethylene / methyl methacrylate / glycidyl methacrylate copolymer, ethylene / maleic anhydride copolymer, ethylene / butene / maleic anhydride copolymer, ethylene / 1-octene / maleic anhydride copolymer, ethylene / butene / 1-octene / maleic anhydride copolymer, ethylene / methyl methacrylate / maleic anhydride copolymer; and / or, The core-shell type toughening agent is composed of a core and a shell; and / or, The block-type toughening agent is at least one of the following polymers: styrene-b-butadiene diblock copolymer, styrene-b-isoprene diblock copolymer, styrene-b-(butadiene-co-isoprene) diblock copolymer, (styrene-co-butadiene)-b-isoprene diblock copolymer, (styrene-co-isoprene)-b-butadiene diblock copolymer, (styrene-co-butadiene)-b-(styrene-co-isoprene) diblock copolymer, (styrene-co-butadiene)-b-(butadiene-co-isoprene) diblock copolymer, (styrene-co-isoprene)-b-(butadiene-co-isoprene) diblock copolymer, styrene-b-butadiene-b-styrene triblock copolymer, butadiene-b-styrene-b-butadiene triblock copolymer, styrene-b-isoprene-b-styrene triblock copolymer, isoprene-b-styrene-b-isoprene triblock copolymer, styrene-b-butadiene-b-isoprene triblock copolymer, styrene-b-isoprene-b-butadiene triblock copolymer, butadiene-b-styrene-b-isoprene triblock copolymer, styrene-b-(butadiene-co-isoprene)-b-styrene triblock copolymer, styrene-b-butadiene-b-isoprene-b-styrene tetrablock copolymer, butadiene-b-styrene-b-isoprene-b-butadiene tetrablock copolymer, isoprene-b-styrene-b-butadiene-b-isoprene tetrablock copolymer, butadiene-b-isoprene-b-styrene-b-isoprene-b-butadiene pentablock copolymer, isoprene-b-butadiene-b-styrene-b-butadiene-b-isoprene pentablock copolymer; and / or, The star-branched toughening agent is at least one of the following polymers: star-branched polyester, star-branched polyurethane, star-branched polyether, star-branched polyamide, star-branched polyetheramide, star-branched polybutadiene, star-branched polyisoprene, star-branched styrene / butadiene copolymer, star-branched styrene / isoprene copolymer, star-branched styrene / butadiene / isoprene copolymer; and / or, The benzophenone UV absorber is at least one of benzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, 2-hydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,3,4-trihydroxybenzophenone, 4,4'-dihydroxybenzophenone; and / or, The benzotriazole UV absorber is at least one of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-5-tert-octylphenyl)benzotriazole, 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol; and / or, The triazine UV absorber is at least one of 2,4,6-tris(2'-hydroxy-4'-n-butoxyphenyl)-1,3,5-triazine, 2,4-bis(4-biphenylyl)-6-(2-hydroxy-4-alkoxyphenyl)-1,3,5-triazine, 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxyphenol, 2-[4,6-bis(2,4-xylyl)-2-(1,3,5-triazinyl)]-5-octyloxyphenol; and / or, The acid ester UV absorber is at least one of phenyl salicylate, 2-ethylhexyl salicylate, 2,4-di-tert-butylphenyl 3,5-di-tert-butyl-4-hydroxybenzoate, diethylamino hydroxybenzoyl benzoic acid hexyl ester, tetraethyl 2,2'-(1,4-phenylenedimethylene)dimalonate, pentaerythritol tetra(2-cyano-3,3-diphenylacrylate).

7. The light-shielding material according to claim 6, wherein: The core of the core-shell toughening agent is at least one of polybutadiene, polyisoprene, butadiene / styrene copolymer, isoprene / styrene copolymer, butadiene / isoprene / styrene copolymer, polyacrylate, olefin / acrylic ester copolymer, olefin / methacrylate copolymer; and / or, The shell of the core-shell toughening agent is at least one of polystyrene, polyacrylate, polymethacrylate, styrene / acrylic ester copolymer, styrene / methacrylate copolymer, styrene / acrylic ester / methacrylate copolymer.

8. The light-shielding material according to any one of claims 1 to 7, wherein: When the thickness of the light-shielding material > 1 mm, the total light transmittance < 0.50%; and / or, When the thickness of the light-shielding material ≤ 1 mm, the total light transmittance < 0.85%.

9. A method for preparing a light-shielding material according to any one of claims 1 to 8, comprising: melting and mixing the components in the stated parts by weight and extruding and pelletizing them to obtain the light-shielding material; preferably, first mixing the base resin, optional crystalline polyester, and toughening agent uniformly to obtain mixture A, mixing the optional flame retardant, optional UV-resistant agent, and antioxidant uniformly to obtain mixture B, and then melting and mixing mixture A, mixture B, and the light-shielding agent pretreated with a surface functional agent in a screw extruder, cooling, and pelletizing to obtain the light-shielding material; more preferably, the melting and mixing temperature is 220 to 300 °C, preferably 250 to 275 °C; and / or, the rotation speed of the screw extruder is 50 to 500 rpm, preferably 150 to 400 rpm; and / or, the total feeding rate of the mixed materials of mixture A, mixture B, and the light-shielding agent pretreated with a surface functional agent is 20 to 40 kg / h.

10. An application of a light-shielding material according to any one of claims 1 to 8 in electronic, electrical, and electrical appliance components.

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