Plastic composition as well as preparation method and application thereof

Abstract

The invention relates to a plastic composition which is characterized by comprising the following components in parts by weight: 88-100 parts of polymer resin; 0.1 to 2 parts of a compound laser marking agent; 0.02-1 part of a black coloring agent; 0.2-1 part of an organic color pigment; the compound laser marking agent is selected from compounding of an ultraviolet laser sensitive agent, a near-infrared laser sensitive agent and a far-infrared laser sensitive agent. By compounding the laser marking agent, ultraviolet laser marking, near-infrared laser marking and far-infrared laser marking can be achieved at the same time, the composition can be induced to generate different optical effects such as pigment color and / or structural color, permanent marks of multiple colors (laser marks of at least two colors) are formed on a single base material, the process is simple and efficient, and the cost is low. And the marking effect is bright and the anti-counterfeiting property is strong.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a plastic composition, its preparation method, and its application. Background Technology

[0002] Laser marking technology, due to its advantages such as permanence, high efficiency, non-contact, and pollution-free operation, has been widely used for marking, decorating, and anti-counterfeiting plastic products. Traditional laser marking typically produces single-color marks on plastic surfaces. The most common method involves using a carbon dioxide laser (10.6μm) or a fiber laser (1.06μm) to carbonize, foam, or change the color of plastics containing special additives (such as carbon black, metal oxides, etc.), thereby forming black, white, or gray marks.

[0003] Polymer color laser marking mainly employs chemical modification and physical bonding methods. While physical bonding can achieve color markings and multiple colors, the process is complex, the coloring is uneven, and the markings are not permanent. Chemical modification, on the other hand, builds upon existing marking methods by further developing the added colorants or pigments. This allows the sample surface to absorb laser energy, resulting in a different color than the original. CN109337360B demonstrates this by adding black pigment to the material. Under strong opacity, the initial color is black, but when the composition is exposed to laser light, the black pigment changes color, leaving behind colored pigment, thus forming a permanent color mark on the part. However, chemical modification generally only achieves a single color on the same substrate, not multiple colors. With the increasing market demand for personalized, high-end, and anti-counterfeiting product appearances, single-color laser marking is no longer sufficient. Currently, no product has achieved multi-color laser marking on the same substrate using chemical modification.

[0004] The bottleneck of existing technologies lies in the fact that their multi-color effects heavily rely on complex post-processing or multi-layer structures, rather than being achieved through precise control of a single homogeneous material. Therefore, there is an urgent need in the field for a specially designed plastic composition, combined with multi-wavelength laser technology, that can fundamentally solve the problem of achieving stable, vibrant, multi-color marking on a single substrate. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical defects and provide a plastic composition that can simultaneously achieve marking by ultraviolet laser, near-infrared laser and far-infrared laser, as well as its preparation method and application.

[0006] This invention is achieved through the following technical solution:

[0007] A plastic composition, by weight, comprises the following components:

[0008] 88-100 parts of polymer resin;

[0009] Mix 0.1-2 parts of the laser marking agent;

[0010] 0.02-1 part black colorant;

[0011] 0.2-1 part organic colored pigment;

[0012] The compound laser marking agent is selected from a mixture of ultraviolet laser sensitizer, near-infrared laser sensitizer, and far-infrared laser sensitizer, with a weight ratio of (0.19-1.21):(0.19-1.21):1.

[0013] In the plastic composition of the present invention, the content of the polymer resin can be any value selected from 88 parts, 89 parts, 90 parts, 91 parts, 92 parts, 93 parts, 94 parts, 95 parts, 96 parts, 97 parts, 98 parts, 99 parts, and 100 parts, or a range between the two; the content of the compounded laser marking agent can be 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1.0 parts, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, and 1.7 parts. The content of black colorant can be any value among 0.02 parts, 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, and 1.0 parts, or a range between the two; the content of organic color pigment can be any value among 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, and 1.0 parts, or a range between the two.

[0014] The polymer resin is selected from at least one of polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), polycarbonate (PC), polyoxymethylene (POM), polybutylene terephthalate (PBT), polyamide (PA), acrylonitrile-butadiene-styrene terpolymer (ABS), and polymethyl methacrylate (PMMA).

[0015] The ultraviolet laser sensitizer is selected from at least one of zinc sulfide, zinc oxide, tin oxide, cerium oxide, cadmium sulfide, cadmium selenide, ammonium molybdate, and ammonium metavanadate. The ultraviolet laser sensitizer is selected from at least one of zinc sulfide, zinc oxide, and ammonium molybdate, more preferably ammonium molybdate.

[0016] The average particle size of the ultraviolet laser sensitizer can be 10 nm-1000 nm, preferably 20-500 nm.

[0017] The near-infrared laser sensor is selected from at least one of copper hydroxyphosphate, iron(II,III) oxide, bismuth oxide (bismuth trioxide), antimony tin oxide (ATO), indium-doped tin oxide, lanthanum hexaboride, tungsten oxide, graphene, graphene oxide, and carbon nanotubes. Preferably, the near-infrared laser sensor is selected from at least one of copper hydroxyphosphate, antimony tin oxide, and graphene, and more preferably from at least one of antimony tin oxide and graphene.

[0018] The average particle size of the near-infrared laser sensor can be 0.1 μm-5 μm, preferably 0.2-1 μm.

[0019] The far-infrared laser sensor is selected from at least one of calcium carbonate, barium sulfate, aluminum hydroxide, magnesium hydroxide, talc, kaolin, and mica. Preferably, the far-infrared laser sensor is selected from at least one of aluminum hydroxide and magnesium hydroxide.

[0020] The average particle size of the far-infrared laser sensor can be 0.5 μm-10 μm, preferably 0.8-5 μm.

[0021] The average particle size of the laser sensitizers was determined by dynamic light scattering method, referring to standard GB / T 29022-2021.

[0022] Preferably, the weight ratio of the ultraviolet laser sensor / near-infrared laser sensor / far-infrared laser sensor is (0.39-0.71):(0.39-0.71):1.

[0023] The black colorant is selected from at least one of aniline black, azo black, copper chromium black, iron chromium black, acetylene carbon black, conductive carbon black, channel carbon black, and furnace carbon black.

[0024] The organic color pigments are selected from at least one of azo color pigments, phthalocyanine color pigments, anthraquinone color pigments, quinacridone color pigments, perylene color pigments, quinophthalone color pigments, heterocyclic color pigments, and methylene color pigments.

[0025] for example:

[0026] The organic yellow pigments are 2-[[1-[[(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)amino]carbonyl]-2-oxopropyl]azo]benzoic acid (pigment yellow 151) and 2-(3-hydroxy-2-quinolinyl)-1,3-indanedione (solvent yellow 114).

[0027] The organic green pigments are phthalocyanine green and 1,4-di-p-tolueneaminoanthraquinone (solvent green 3).

[0028] The organic blue pigments are phthalocyanine blue and 1,4-bis[(2,4,6-trimethylphenyl)amino]-9,10-anthradinone.

[0029] Laser wavelengths include, but are not limited to: ultraviolet light (266nm, 355nm), green light (532nm), near-infrared fiber laser (1064nm), far-infrared light (9.3μm, 10.6μm), etc.

[0030] The product also includes 0-0.5 parts by weight of antioxidant, wherein the antioxidant is selected from at least one of hindered phenolic antioxidants, amine antioxidants, phosphite antioxidants or diphenylamine antioxidants.

[0031] Based on weight, 0-30 parts of mechanical reinforcing filler may also be added, wherein the mechanical reinforcing filler is selected from at least one of glass fiber, carbon fiber (CF), and mineral filler (talc, wollastonite); based on weight, it also includes 5-20 parts of flame retardant, wherein the flame retardant is a halogen-free flame retardant. The flame retardant is at least one of phosphorus-based (DOPO derivative), nitrogen-based (melamine cyanuric acid MCA), intumescent flame retardant (ammonium polyphosphate APP / pentaerythritol PER / melamine MEL system), and magnesium hydroxide / aluminum.

[0032] The method for preparing the plastic composition of the present invention includes the following components: mixing the components evenly according to the specified ratio, and extruding and granulating the mixture through a twin-screw extruder to obtain the plastic composition. The extrusion temperature range is 180-280°C, the screw length-to-diameter ratio is 25-50:1, and the rotation speed range is 200-600 rpm.

[0033] The application of the plastic composition of the present invention is for the preparation of laser-marked parts.

[0034] The present invention has the following beneficial effects:

[0035] This invention, through a specific ratio of compound laser marking agent and specific amounts of black colorant and organic color pigment, enables the plastic composition parts of this invention to have a significant marking display effect on ultraviolet laser, near-infrared laser and far-infrared laser. After marking with these three types of lasers, the laser marking effect of the parts is bright and has strong anti-counterfeiting properties. Detailed Implementation

[0036] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0037] The raw materials used in the embodiments and comparative examples of this invention are as follows:

[0038] ABS: POLYLAC® PA-777B, purchased from Chi Mei Industrial Co., Ltd., Taiwan, China;

[0039] PMMA: PMMA CM-207, purchased from Sinochem Plastics Co., Ltd.;

[0040] PS: GPPS GP-525 was purchased from Jiangsu Lv'an Qingfeng New Materials Co., Ltd.

[0041] Organic yellow pigment: 2-[[1-[[(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)amino]carbonyl]-2-oxopropyl]azo]benzoic acid, Pigment Yellow 151, PV Fast Yellow H4G, purchased from Clariant, Switzerland.

[0042] Organic red pigment: 2,9-dimethyl-5,12-dihydroquinolino[2,3-B]acrid-7,14-dione, ArrovideRed 1102B, purchased from Clariant AG, Switzerland.

[0043] Organic green pigment: Solvent Green 3, Ranbar Green 5B, purchased from Shanghai Jingyan Chemical Co., Ltd.

[0044] Organic blue pigment: Phthalocyanine Blue, Pigment Blue 15:3, K7090, purchased from BASF.

[0045] Inorganic green pigment: cobalt green, pigment green 50, Ranbar Green I-GL, purchased from Shanghai Jingyan Chemical Co., Ltd.

[0046] Inorganic blue pigment: Ultramarine blue, Pigment Blue 29, Ultramarine blue 5008, purchased from Holliday Company, UK.

[0047] Black colorant 1: Copper chromate black, purchased from Wuhan Kemic Biomedical Technology Co., Ltd.

[0048] Black colorant 2: Acetylene black, purchased from Tianjin Huayuan Chemical Technology Co., Ltd.

[0049] Ultraviolet laser sensitizer:

[0050] Zinc sulfide: purchased from Guangdong Xinda New Materials Co., Ltd., with an average particle size of 0.3 micrometers.

[0051] Zinc oxide: purchased from Jinda Nanotechnology (Xiamen) Co., Ltd., with an average particle size of 0.2 micrometers.

[0052] Ammonium metavanadate: CAS: 7803-85-6, purchased from Aladdin, with an average particle size of 0.4 micrometers.

[0053] Ammonium molybdate: CAS: 13106-76-8, purchased from Aladdin, with an average particle size of 0.5 micrometers.

[0054] Near-infrared laser sensor:

[0055] Copper hydroxyphosphate: purchased from Jinan Zhiheng Zhiyuan Chemical Technology Co., Ltd., with an average particle size of 0.5 micrometers.

[0056] Antimony tin oxide: purchased from Shanghai Maoguo Nanotechnology Co., Ltd., with an average particle size of 0.4 micrometers.

[0057] Graphene: Purchased from Changzhou Sixth Element Materials Technology Co., Ltd., with an average particle size of 0.5 micrometers.

[0058] Indium-doped tin oxide: CAS: 50926-11-9, purchased from Beijing Deco Island Gold Technology Co., Ltd., with an average particle size of 0.4 micrometers.

[0059] Bismuth trioxide: CAS: 1304-76-3, purchased from Chaotai Metal Materials Co., Ltd., with an average particle size of 0.5 micrometers.

[0060] Far-infrared laser sensor:

[0061] Calcium carbonate: purchased from Lingshou County Wanduo Mineral Products Processing Co., Ltd., with an average particle size of 1 micrometer.

[0062] Barium sulfate: purchased from Foshan Huiyisheng Technology Co., Ltd., with an average particle size of 1 micrometer.

[0063] Magnesium hydroxide: purchased from Weifang Haililong Magnesium Industry Co., Ltd., with an average particle size of 2 micrometers.

[0064] Aluminum hydroxide: purchased from Fujian Chuanglong Import & Export Trading Co., Ltd., with an average particle size of 3 micrometers.

[0065] Antioxidant: Antioxidant 1010 (commercially available, hindered phenolic antioxidant, BASF) and Antioxidant 168 (commercially available, phosphite antioxidant, BASF) are mixed in a mass ratio of 1:2;

[0066] Preparation method of the rate composition in the examples and comparative examples: The components are mixed evenly and extruded and granulated using a twin-screw extruder to obtain a plastic composition. The screw length-to-diameter ratio is 44:1, and the speed range is 300-400 rpm. The extrusion temperature is (ABS: 190-220 ℃, PMMA: 190-250 ℃, PS: 160-200 ℃).

[0067] Laser marking method:

[0068] The following marking methods will be used for laser marking with ultraviolet laser, near-infrared laser, and far-infrared laser (in no particular order):

[0069] The Shenzhen Dapeng UV-3X ultraviolet laser marking machine was used, with a laser wavelength of 355nm. The laser marking process was as follows: frequency of 30 KHz, speed of 1000 mm / s, and pulse width of 25 μs. A 40 mm × 40 mm circle was marked on the surface of the plastic board for color measurement and testing.

[0070] The Shenzhen Han's Laser Infrared Laser Marking Machine EP-12 was used, with a laser wavelength of 1064nm. The laser marking process was as follows: frequency of 75KHz, speed of 1000 mm / s, and current of 20 A. A 40 mm × 40 mm circle was marked on the surface of a plastic board for color measurement and testing.

[0071] The Shenzhen Han's Laser Far Infrared Laser Marking Machine CO2-T200-50 was used, with a laser wavelength of 10640nm. The laser marking process was: frequency of 40 KHz and speed of 1000 mm / s. A 40 mm × 40 mm circle was marked on the surface of the plastic board for color measurement and testing.

[0072] Test methods:

[0073] (1) Color measurement method: Using a spectrophotometer in reflectance mode, the L*, a*, and b* values ​​of the color before and after laser marking of a 40 mm × 40 mm area were measured in the CIE Lab color space. The spectrophotometer was an X-rite Color-Eye 7000A spectrophotometer. The tristimulus values ​​of the sample color were calculated by measuring the spectral reflectance factor or spectral transmittance of the object and then converted to CIE Lab values.

[0074] L* represents lightness, ranging from 0 to 100, indicating colors from dark (black) to light (white).

[0075] a* represents red and green, and the value changes from positive to negative, indicating the color changes from red to green.

[0076] b* represents yellow to blue, and the value changes from positive to negative, indicating a color change from yellow to blue.

[0077] DL* represents the difference in brightness; a positive value indicates a lighter (whiter) lightness, while a negative value indicates a darker (blacker) lightness.

[0078] Da* represents the difference between red and green; a positive value indicates more red, and a negative value indicates more green.

[0079] Db* represents the difference between yellow and blue; a positive value indicates more yellow, and a negative value indicates more blue.

[0080] DE represents the total color difference. The calculation formula is as follows:

[0081] DE=(DL* 2 +Da* 2 +Db* 2 )^0.5;

[0082] The larger the DE value of the color change before and after laser marking, the better it reflects the marking contrast of the material.

[0083] Table 1: Component content and test results of the plastic compositions in Examples 1-7

[0084] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 ABS 88 PMMA 95 95 95 95 95 PS 100 Zinc sulfide 0.025 Zinc oxide 0.125 0.071 0.042 0.250 0.095 Ammonium metavanadate 0.25 Copper hydroxyphosphate 0.025 Tin oxide antimony 0.125 0.071 0.250 0.042 0.167 graphene 0.25 Calcium carbonate 0.1 Barium sulfate 0.25 0.357 0.208 0.208 0.238 Magnesium hydroxide 0.5 Copper Chromium Black 0.02 1 Acetylene black 0.5 0.5 0.5 0.5 0.5 Organic yellow pigment 1 Organic red pigment 0.5 0.5 0.5 0.5 0.5 Organic green pigment 0.2 antioxidants 0.5 0.5 Color before marking black black black black black black black 355nm marking color light yellow light yellow orange light yellow light yellow light yellow light yellow DE before and after 355nm marking 32.86 37.65 32.06 35.08 32.43 39.13 36.45 1064nm marking color yellow red green red red red red DE before and after 1064nm marking 35.62 37.12 34.24 34.45 37.74 33.25 38.32 10.6μm marking color white white white white white white white DE before and after 10.6μm marking 46.07 54.17 56.23 55.07 53.98 53.78 54.09

[0085] Table 2: Component content and test results of the plastic compositions in Examples 8-14

[0086] Example 8 Example 9 Example 10 Example 11 Example 12 Example 13 Example 14 ABS 88 88 88 88 88 88 PMMA 95 Zinc sulfide 0.025 0.025 0.025 Zinc oxide 0.167 0.025 Ammonium metavanadate 0.025 Ammonium molybdate 0.025 Copper hydroxyphosphate 0.025 0.025 0.025 Tin oxide antimony 0.095 0.025 graphene 0.025 Indium-doped tin oxide 0.025 Calcium carbonate 0.1 0.1 0.1 0.1 0.1 0.1 Barium sulfate 0.238 Copper Chromium Black 0.02 0.02 0.02 0.02 0.02 0.02 Acetylene black 0.5 Organic yellow pigment 1 1 1 1 1 1 Organic red pigment 0.5 antioxidants 0.5 0.5 0.5 0.5 0.5 0.5 Color before marking black black black black black black black 355nm marking color light yellow light yellow Light green light blue light yellow light yellow light yellow DE before and after 355nm marking 38.85 32.20 29.30 39.49 32.76 32.57 33.03 1064nm marking color red yellow yellow yellow yellow yellow yellow DE before and after 1064nm marking 35.92 35.46 35.60 35.52 37.38 39.60 34.26 10.6μm marking color white white white white white white white DE before and after 10.6μm marking 54.13 46.37 46.13 46.24 46.56 46.38 46.29

[0087] As can be seen from Examples 2 / 4-8, the preferred weight ratio of ultraviolet laser sensitizer / near-infrared laser sensitizer / far-infrared laser sensitizer is (0.39-0.7):(0.39-0.71):1, resulting in higher color marking contrast and better color marking effect.

[0088] As can be seen from Examples 2 / 9-11, the ultraviolet laser sensitizer is preferably at least one of zinc sulfide, zinc oxide, and ammonium molybdate, and more preferably ammonium molybdate.

[0089] Table 3: Component content and test results of the plastic compositions in Examples 15-18

[0090] Example 15 Example 16 Example 17 Example 18 ABS 88 88 88 88 Zinc sulfide 0.025 0.025 0.025 0.025 Copper hydroxyphosphate 0.025 0.025 0.025 Bismuth trioxide 0.025 Calcium carbonate 0.1 Barium sulfate 0.1 Magnesium hydroxide 0.1 Aluminum hydroxide 0.1 Copper Chromium Black 0.02 0.02 0.02 0.02 Organic yellow pigment 1 1 1 1 antioxidants 0.5 0.5 0.5 0.5 Color before marking black black black black 355nm marking color light yellow light yellow light yellow light yellow DE before and after 355nm marking 32.48 32.70 33.05 32.95 1064nm marking color yellow yellow yellow yellow DE before and after 1064nm marking 33.62 35.23 35.47 35.38 10.6μm marking color white white white white DE before and after 10.6μm marking 46.16 46.59 50.05 50.58

[0091] As can be seen from Examples 2 / 12-15, the near-infrared laser sensor is preferably at least one of copper hydroxyphosphate, antimony tin oxide, and graphene, and more preferably at least one of antimony tin oxide and graphene.

[0092] As can be seen from Examples 2 / 16-18, the far-infrared laser sensor is preferably at least one of aluminum hydroxide and magnesium hydroxide.

[0093] Table 4: Component content and test results of plastic compositions in Comparative Examples 1-5

[0094] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 PMMA 95 95 ABS 88 88 88 Zinc oxide 0.125 0.125 Zinc sulfide 0.15 Tin oxide antimony 0.125 0.125 Copper hydroxyphosphate 0.15 Barium sulfate 0.250 0.250 Calcium carbonate 0.15 Acetylene black 0.5 0.5 Copper Chromium Black 0.02 0.02 0.02 Organic yellow pigment 1 1 1 Inorganic green pigment 0.5 Inorganic blue pigment 0.5 antioxidants 0.5 0.5 0.5 Color before marking black black black black black Color after 355nm marking light yellow gray-black gray-black light yellow light yellow DE before and after 355nm marking 37.36 23.75 24.06 31.25 30.65 Color after 1064nm marking light yellow yellow light yellow gray gray DE before and after 1064nm marking 25.64 38.26 26.23 33.32 31.65 Color after 10.6μm marking Ash Ash white white white DE before and after 10.6μm marking 24.76 26.21 48.31 48.76 48.36

[0095] As can be seen from Comparative Examples 1-3, it is impossible to achieve a bright color marking effect when using only ultraviolet laser sensitizer / near-infrared laser sensitizer / far-infrared laser sensitizer.

[0096] As shown in Comparative Example 4 / 5, inorganic pigments are too large to enter the amorphous region of the resin matrix for dyeing. Therefore, after laser marking, due to the diffuse reflection caused by resin foaming, only the gray-white structural color can be displayed, and the background color of the inorganic pigment cannot be displayed.

Claims

1. A plastic composition, characterized in that, By weight, it includes the following components: 88-100 parts of polymer resin; Mix 0.1-2 parts of the laser marking agent; 0.02-1 part black colorant; 0.2-1 part organic colored pigment; The compound laser marking agent is selected from a mixture of ultraviolet laser sensitizer, near-infrared laser sensitizer, and far-infrared laser sensitizer, with a weight ratio of (0.19-1.21):(0.19-1.21):

1.

2. The plastic composition according to claim 1, characterized in that, The polymer resin is selected from at least one of polypropylene, polyethylene, polyvinyl chloride, polystyrene, polycarbonate, polyoxymethylene, polybutylene terephthalate, polyamide, acrylonitrile-butadiene-styrene terpolymer, or polymethyl methacrylate.

3. The plastic composition according to claim 1, characterized in that, The ultraviolet laser sensor is selected from at least one of zinc sulfide, zinc oxide, tin oxide, cerium oxide, cadmium sulfide, cadmium selenide, ammonium molybdate, and ammonium metavanadate. Preferably, the ultraviolet laser sensor is selected from at least one of zinc sulfide, zinc oxide, and ammonium molybdate, and more preferably, ammonium molybdate. The near-infrared laser sensor is selected from at least one of copper hydroxyphosphate, iron tetroxide, bismuth oxide, antimony tin oxide, indium-doped tin oxide, lanthanum hexaboride, tungsten oxide, graphene, graphene oxide, and carbon nanotubes. Preferably, the near-infrared laser sensor is selected from at least one of copper hydroxyphosphate, antimony tin oxide, and graphene, and more preferably, antimony tin oxide and graphene. The far-infrared laser sensor is selected from at least one of calcium carbonate, barium sulfate, aluminum hydroxide, magnesium hydroxide, talc, kaolin, and mica. Preferably, the far-infrared laser sensor is selected from at least one of aluminum hydroxide and magnesium hydroxide.

4. The plastic composition according to claim 1, characterized in that, The weight ratio of the ultraviolet laser sensitizer / near-infrared laser sensitizer / far-infrared laser sensitizer is (0.39-0.71):(0.39-0.71):

1.

5. The plastic composition according to claim 1, characterized in that, The black colorant is selected from at least one of aniline black, azo black, copper chromium black, iron chromium black, acetylene carbon black, conductive carbon black, channel carbon black, and furnace carbon black.

6. The plastic composition according to claim 1, characterized in that, The organic color pigments are selected from at least one of azo color pigments, phthalocyanine color pigments, anthraquinone color pigments, quinacridone color pigments, perylene color pigments, quinophthalone color pigments, heterocyclic color pigments, and methylene color pigments.

7. The plastic composition according to claim 1, characterized in that, The product also includes 0-0.5 parts by weight of antioxidant, wherein the antioxidant is selected from at least one of hindered phenolic antioxidants, amine antioxidants, phosphite antioxidants or diphenylamine antioxidants.

8. The plastic composition according to claim 1, characterized in that, Based on weight, it further includes 0-30 parts of mechanical reinforcing filler, wherein the mechanical reinforcing filler is selected from at least one of glass fiber, carbon fiber (CF), and mineral filler (talc, wollastonite); based on weight, it further includes 5-20 parts of halogen-free flame retardant, wherein the flame retardant is halogen-free flame retardant.

9. A method for preparing the plastic composition according to any one of claims 1-8, characterized in that, The composition includes the following components: the components are mixed evenly according to the formula, and then extruded and granulated through a twin-screw extruder to obtain a plastic composition.

10. The application of the plastic composition according to any one of claims 1-8, characterized in that, Used for preparing laser-marked parts.