Colorful laser marking composition as well as preparation method and application thereof

Abstract

The invention discloses a color laser marking composition as well as a preparation method and application thereof. The color laser marking composition comprises the following components in parts by weight: 88-110 parts of resin; 0.1 to 5 parts of photosensitive reversible toner; 0.01-1 part of a visible light absorbent; 0.1 to 2 parts of pigment; and 0.05 to 1 part of an ultraviolet absorbent. According to the color laser marking composition, the photosensitive reversible toner and the visible light absorbent are added, the ultraviolet absorbent is combined, color marks are marked on white and color substrates, high definition and color saturation are achieved, and marking is controllable.

Description

Technical Field

[0001] The present invention relates to the technical field of laser marking, and more specifically, to a color laser marking composition and a preparation method and application thereof. Background Art

[0002] Laser marking of polymers is a new marking method. It uses the high energy of laser to carbonize the plastic surface or decompose certain components on the surface to produce gas to foam the plastic, thereby obtaining a mark with a large color difference from the base color. Compared with silk screen printing, offset printing and other methods, it is more environmentally friendly and has lower cost, and is receiving more and more attention and application.

[0003] Color laser marking of polymers mainly includes chemical modification method and physical bonding method. Although the physical bonding method can obtain color marking, the process is complicated, the coloring is uneven, and the marking is not permanent. The chemical modification method is based on the original marking method, and further development is made on the added colorant or pigment, so that the color produced after the surface of the sample absorbs the laser energy is different from the original. In the prior art CN116120702A, color marking is obtained by decomposing and discoloring the colorant and black substance (which can absorb laser), but it is mainly aimed at marking color on black matrix materials, and it cannot achieve marking of another color on white or colored matrix materials. There are few studies on marking color marks on white or colored matrixes. Therefore, there is a need in the art to develop a color laser marking composition that can be used to mark permanent colors on white or colored matrixes. Summary of the invention

[0004] In order to overcome the above-mentioned shortcomings or defects in the prior art, the present invention provides a color laser marking composition, which can be used to mark permanent color marks on white and colored polymer substrates.

[0005] Another object of the present invention is to provide a method for preparing the color laser marking composition.

[0006] Another object of the present invention is to provide an application of the color laser marking composition.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A color laser marking composition, comprising the following components calculated in parts by weight:

[0009]

[0010] The invention provides a color laser marking composition. The composition is added with a photosensitive reversible color powder and a visible light absorber, and combined with an ultraviolet absorber, so as to realize color marking on a white and colored substrate, and has high clarity and color saturation, and the marking is permanent; specifically, after the general photosensitive reversible color powder changes color when absorbing light of a specific wavelength, it will restore the original color under the irradiation of a visible light wavelength. By matching with a visible light absorber, the condition for the photosensitive reversible color powder to restore the original color will be destroyed, so that the color will change when absorbing light of a specific wavelength and will not be restored. Adding an ultraviolet absorber to the system can make the resin better absorb the ultraviolet light emitted by an ultraviolet laser marking machine, so that the range of laser marking can be controlled and clear.

[0011] In the color laser marking composition of the present invention, the resin preferably accounts for no less than 90 wt.%.

[0012] Furthermore, the color laser marking composition comprises the following components calculated in parts by weight:

[0013]

[0014] Furthermore, the photosensitive reversible toner includes one or more of spiropyran compounds, spirooxazine compounds, azobenzene compounds, diarylethene compounds, and fulgide compounds.

[0015] Furthermore, the photosensitive reversible toner is one or more of azobenzene compounds, spirooxazone compounds, and fulgide compounds.

[0016] Specifically, the spiropyran compound is one or more of spiro[1,3,3-trimethylindole-(6'-bromochroman)], spiro[1,3,3-trimethylindole-(8'-methoxychroman)], 1,3,3-trimethylindole-6'-nitrochroman and spiro[1,3,3-trimethylindolechroman], 1',3'-dihydro-8-methoxy-1',3',3'-trimethyl-6-nitrospiro[2H-1-benzopyran-2,2'-[2H]indole], 1,3,3-trimethylindole naphthospioxazine, spiro[1,3,3-trimethylindole-β-chroman] or N-hydroxyethyl-3,3-dimethyl-6-nitroindole spiropyran.

[0017] Specifically, the spirooxanes are one or more of 1,3-dihydro-1,3,3-trimethylspiro[2H-indole-2,3`-[3H]phenanthro[9,10-B](1,4)oxazine], 5-chloro-1,3-dihydro-1,3,3-trimethylspiro[2H-indole-2,3′-(3H)naphtho[2,1-B](1,4)oxazine], 1,3-dihydro-1,3,3-trimethyl-6'-(1-piperidinyl)spiro[2H-indole-2,3'-[3H]naphtho[2,1-B][1,4]oxazine], and 1,3-dihydro-1,3,3-trimethyl-6'-(4-morpholinyl)-spiro[2H-indole-2,3'-[3H]naphtho[2,1-B][1,4]oxazine].

[0018] Specifically, the azobenzene is one or more of 4,4'-bis(decyloxy)-3-methylazobenzene, 4-[bis(9,9-dimethylfluoren-2-yl)amino]azobenzene, 4,4'-bis(hexyloxy)-3-methylazobenzene, and 4,4'-bis(dodecyloxy)-3-methylazobenzene.

[0019] The diarylethene compound is one or more of (Z)-3,3'-(1,2-dimethyl-1,2-ethylenediyl)bis[2,5-dimethyl-thiophene, cis-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thiophene)ethylene, 2,3-bis(2,4,5-trimethyl-3-thiophene)maleic anhydride, 1,2-bis(2,4-dimethyl-5-phenyl-3-thiophene)-3,3,4,4,5,5-hexafluoro-1-cyclopentene or 1,2-bis[2-methylbenzo[b]thiophene-3-yl]-3,3,4,4,5,5-hexafluoro-1-cyclopentene.

[0020] The fulgide compound is 2-(allyloxymethyl)-18-crown-6-ether and / or (E)-3-(adamantan-2-ylidene)-4-(1-(2,5-dimethylfuran-3-yl)ethylidene)dihydrofuran-2,5-dione.

[0021] It should be noted that the hue of the pigment is different from the hue of the color that the photosensitive reversible color powder will produce after absorbing external ultraviolet light.

[0022] Furthermore, the resin includes one or more of polypropylene, polyethylene, polyvinyl chloride, polystyrene, polycarbonate, polyoxymethylene, polybutylene terephthalate, polyamide, acrylonitrile-butadiene-styrene terpolymer or polymethyl methacrylate.

[0023] Specifically, the melt flow rate of the polypropylene at 230° C. and 2.16 kg is 0.5 to 100 g / 10 min.

[0024] The melt flow rate of the acrylonitrile-butadiene-styrene terpolymer is 1-70 g / 10 min at 220° C. and 10 kg.

[0025] The melt flow rate of the polymethyl methacrylate at 230° C. and 3.8 kg is 1 to 50 g / 10 min.

[0026] The melt flow rate of the polyoxymethylene at 190° C. and 2.16 kg is 1 to 50 g / 10 min.

[0027] The polystyrene has a melt flow rate of 1 to 50 g / 10 min at 200° C. and 5 kg.

[0028] Specifically, the test standard for the melt flow rate is GB / T3682.1-2018.

[0029] Furthermore, the ultraviolet absorber includes one or more of benzophenone absorbers, benzotriazole absorbers or triazine absorbers.

[0030] In some preferred embodiments, the ultraviolet absorber is a benzotriazole ultraviolet absorber and / or a triazine absorber. The color difference of the prepared color laser marking composition before and after marking is more obvious.

[0031] Specifically, the benzophenone absorbent is 2-hydroxy-4-octyloxybenzophenone, and the benzotriazole absorbent is 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-amylphenyl)benzotriazole, 2-(2'-hydroxy-5'-tert-octyl)phenylbenzotriazole, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2,2'-methylenebis(4-tert-octyl)benzotriazole, The triazine absorbent is one or more of 2-[2-hydroxy-4-[3-(2-ethylhexyloxy)-2-hydroxypropoxy]phenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine-2-yl)-5-octyloxyphenol and 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxy-phenol.

[0032] Further, the visible light absorber includes basic red 12, 1-butyl-2-[5-(1-butyl-1,3-dihydro-3,3-dimethyl-2H-indol-2-ylidene)-penta-1,3-diphenyl]-3,3-dimethyl-3H-indole hexafluorophosphate, 2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3-pentadien-1-yl]-1,3,3-trimethyl 3H-indole chloride, 2,4-bis[4-(diethylamino)-2-hydroxyphenyl]squaric acid, 3,3'-diethyloxacarbocyanine iodide, 3-butyl-2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3-pentadienyl]-1,1-dimethyl-1H-benzo[E]indole tetrafluoroborate, 4,5:4',5'-bisphenyl-1,1'-dibutyl-3,3 ,3',3'-tetramethylindole dicarboxylic acid cyanide hexafluorophosphate, 1-butyl-5-[2-(1-butyl-3,3-dimethyl-1,3-dihydroindole-2-ylidene)ethylidene]-4-methyl-2,6-dioxo-1,2,5,6-tetrahydropyridine-3-carbonitrile, [5-[2-(3-ethyl-3H-benzothiazol-2-ylidene)ethylidene]-4-oxo-2-thionothiazolidin-3-yl]acetic acid, 2-[3 -(3-butyl-1,3-dihydro-1,1-dimethyl-2H-benzo[E]indol-2-ylidene)-1-propen-1-yl]-1,1,3-trimethyl-1H-benzo[E]indole hexafluorophosphate or 2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3-pentadien-1-yl]-1,3,3-trimethyl-3H-indole tetrafluoroborate.

[0033] Furthermore, the visible light absorber is basic red and / or 2,4-bis[4-(diethylamino)-2-hydroxyphenyl]squaric acid.

[0034] Furthermore, the pigment includes one or more of white phase, red phase, yellow phase, green phase, blue phase or purple phase pigments.

[0035] Those skilled in the art should understand that white phase pigments appear white under visible light, red phase pigments appear red under visible light, yellow phase pigments appear yellow under visible light, green phase pigments appear green under visible light, blue phase pigments appear blue under visible light, and purple phase pigments appear purple under visible light.

[0036] Specifically, the white phase pigment may be titanium dioxide and / or zinc sulfide.

[0037] In a specific embodiment, the titanium dioxide has an average particle size of 200 to 300 nm.

[0038] Specifically, the average particle size is determined by dynamic light scattering method, which is measured according to the reference standard GB / T 29022-2021.

[0039] Specifically, the titanium dioxide has three crystal forms: rutile, anatase or brookite.

[0040] Furthermore, the crystal form of the titanium dioxide is rutile.

[0041] The red pigment may be methyl 4-cyano-5-[[5-cyano-2,6-di[(3-methoxypropyl)amino]-4-methyl-3-pyridyl]azo]-3-methyl-2-thiophenecarboxylate and / or 5,12-dihydro-2,9-dimethylquinolino[2,3-B]acridine-7,14-dione.

[0042] The yellow pigment may be 2-(3-hydroxy-2-quinolyl)-1,3-indanedione and / or 3-(5-chloro-2-benzoxazolyl)-7-(diethylamino)-2H-1-benzopyran-2-one.

[0043] The green phase pigment may be phthalocyanine green and / or 1,4-di-p-toluaminoanthraquinone.

[0044] The blue phase pigment may be phthalocyanine blue and / or 1,4-bis[(2,4,6-trimethylphenyl)amino]-9,10-anthracenedione.

[0045] The violet pigment may be solvent violet 37 and / or pigment violet 15.

[0046] Furthermore, the color laser marking composition further comprises 0.1 to 2 parts of an antioxidant and / or 0.5 to 5 parts of a dispersant.

[0047] The antioxidant described in the present invention can be selected from commonly used antioxidants according to the prior art, such as but not limited to hindered phenol antioxidants and / or phosphite antioxidants.

[0048] Specifically, the hindered phenol antioxidant is one or more of β(3,5-di-tert-butyl-4-hydroxyphenyl) propionate octadecyl ester or 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione, tetrakis[β(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester or diethylene glycol bis[methyl 3-(3-tert-butyl-4-hydroxy-5-methylphenyl) propionate].

[0049] Specifically, the phosphite antioxidant is one or more of tris(2,4-di-tert-butylphenyl)phosphite, bis(2,6-di-tert-butyl-4-tolyl)pentaerythritolphosphite, bis(2,4-dicumylphenyl)pentaerythritol-diphosphite or bis(2,4-di-tert-butylphenyl)pentaerythritol bis-diphosphite.

[0050] The dispersant in the present invention can be selected from commonly used dispersants in reference to the prior art, such as but not limited to one or more of zinc stearate, calcium stearate, magnesium stearate, polyethylene wax or oxidized polyethylene wax.

[0051] The present invention also provides a method for preparing the color laser marking composition, comprising the following steps: uniformly mixing the components, melt-extruding, and granulating to obtain the color laser marking composition.

[0052] Specifically, the temperature of the melt extrusion is 180-240°C.

[0053] Specifically, the extrusion is performed using a twin-screw extruder.

[0054] Specifically, the aspect ratio of the twin-screw extruder is 25-40:1, and the screw speed is 200-600 rpm.

[0055] The present invention also protects the use of the above-mentioned color laser marking composition in the preparation of consumer electronic products, and is particularly suitable for marking white or colored materials.

[0056] Compared with the prior art, the present invention has the following beneficial effects:

[0057] The invention provides a color laser marking composition, which can realize color laser marking on a white or colored matrix resin by adopting a photosensitive reversible color powder and a visible light absorber in combination with an ultraviolet absorber, has high clarity and color saturation, and the marking is controllable. DETAILED DESCRIPTION

[0058] The present invention is further described below in conjunction with specific embodiments, but the embodiments do not limit the present invention in any form. Unless otherwise specified, the raw materials and reagents used in the embodiments of the present invention are conventionally purchased raw materials and reagents.

[0059] The raw materials used in the embodiments and comparative examples of the present invention are:

[0060] 1. Raw materials and reagents

[0061] Resin:

[0062] Resin 1: Polypropylene (PP), PP H1500, purchased from LOTTE CHEMICAL Co., Ltd.

[0063] Resin 2: Acrylonitrile-butadiene-styrene terpolymer (ABS), PA-777B was purchased from Chi Mei Industrial Co., Ltd., Taiwan, China.

[0064] Resin 3: polymethyl methacrylate (PMMA), PMMA CM-207, purchased from Sinochem Plastics Co., Ltd.;

[0065] Resin 4: polystyrene (PS), GPPS GP-525, purchased from Jiangsu Lu'an Qingfeng New Materials Co., Ltd.;

[0066] Resin 5: polyoxymethylene (POM), POM M90-44, purchased from Baotailing Engineering Plastics (Nantong) Co., Ltd.;

[0067] pigment:

[0068] Pigment 1: Titanium dioxide, R-69, purchased from Meililian Titanium Industry Co., Ltd.

[0069] Pigment 2: 2-(3-hydroxy-2-quinolyl)-1,3-indanedione, solvent yellow 114, TECHSOL YELLOW E3G, purchased from Shenzhen Dingtai Chemical Co., Ltd.

[0070] Pigment 3: 4-cyano-5-[[5-cyano-2,6-bis[(3-methoxypropyl)amino]-4-methyl-3-pyridyl]azo]-3-methyl-2-thiophenecarboxylic acid methyl ester, solvent red 195, CISolvent red 195, purchased from Kunshan Yuanyuan Plastic Pigment Co., Ltd.

[0071] Pigment 4: Solvent Yellow 10GN, available from LANXESS Deutschland GmbH.

[0072] Pigment 5: Phthalocyanine Green, Pigment Green 7, PV FAST GREEN GNX, purchased from CLARIANT CHEMICALS.

[0073] Pigment 6: Phthalocyanine blue, Pigment Blue 15, BF1535, purchased from Xuancheng Yabang Chemical Co., Ltd.

[0074] Photosensitive reversible toner:

[0075] Photosensitive reversible toner 1: azobenzene compound, 4,4'-bis(decyloxy)-3-methylazobenzene, purchased from Shanghai Titan Technology Co., Ltd.;

[0076] Photosensitive reversible toner 2: spirooxazone compound, 1,3-dihydro-1,3,3-trimethyl-6'-(1-piperidinyl)spiro[2H-indole-2,3'-[3H]naphtho[2,1-B][1,4]oxazine], purchased from Shanghai MacLean Biochemical Technology Co., Ltd.;

[0077] Photosensitive reversible toner 3: spiropyran compound, spiro[1,3,3-trimethylindolechroman], purchased from Shanghai Titan Technology Co., Ltd.;

[0078] Laser marking agent: Iriotec 8825, purchased from Merck Group, Germany.

[0079] UV absorber:

[0080] UV absorber 1: UV-234, benzotriazole UV absorber, 2-(2-hydroxy-3',5'-dicumylphenyl)benzotriazole, purchased from Tianjin Lianlong New Materials Co., Ltd.;

[0081] UV absorber 2: UV-1577, triazine absorber, 2-(4,6-diphenyl-1,3,5-triazine-2-yl)-5-hexyloxy-phenol, purchased from Tianjin Lianlong New Materials Co., Ltd.;

[0082] Ultraviolet absorber 3: UV-531, benzophenone absorber, 2-hydroxy-4-n-octyloxybenzophenone, purchased from Tianjin Lianlong New Materials Co., Ltd.;

[0083] Visible light absorbers:

[0084] Visible light absorber 1: 2,4-bis[4-(diethylamino)-2-hydroxyphenyl]squaric acid, purchased from Shanghai MacLean Biochemical Technology Co., Ltd.;

[0085] Visible light absorber 2: 3,3'-diethyloxacarbocyanine iodide, purchased from Shanghai MacLean Biochemical Technology Co., Ltd.;

[0086] Visible light absorber 3: Basic Red 12, purchased from Shanghai Yuanye Biotechnology Co., Ltd.;

[0087] Antioxidant: Antioxidant-1: Antioxidant 1010 (commercially available, hindered phenol antioxidant, BASF) and antioxidant 168 (commercially available, phosphite antioxidant, BASF) were mixed in a mass ratio of 1:2;

[0088] Antioxidant-2: Antioxidant 1098 (commercially available, hindered phenol antioxidant, BASF) and antioxidant 168 (commercially available, phosphite antioxidant, BASF) were mixed in a mass ratio of 1:2;

[0089] Dispersants:

[0090] Dispersant 1: Oxidized polyethylene wax (OPE wax), Jiangsu Wannapu Company.

[0091] Dispersant 2: zinc stearate, Tianjin Langhu Technology Co., Ltd.

[0092] It should be noted that the same raw materials are used in the parallel experiments of the embodiments and comparative examples of the present invention.

[0093] 2. The color laser marking compositions of the embodiments and comparative examples of the present invention are prepared by the following preparation method:

[0094] According to the formula, resin, photosensitive reversible color powder, pigment, ultraviolet absorber, antioxidant and dispersant are weighed and mixed evenly, and then added into a twin-screw extruder, melt-extruded and granulated to obtain a color laser marking composition. The melt extrusion temperature is 200°C, the aspect ratio of the twin-screw extruder is 40:1, and the rotation speed of the twin-screw extruder is 400rpm.

[0095] 3. Performance test:

[0096] The color laser marking compositions prepared in the examples and comparative examples were measured according to the following laser marking method and color measurement method:

[0097] Laser marking method: Shenzhen Han's UV laser marking machine UV-3X (laser beam output power of 3W), laser wavelength of 355nm, laser marking process: frequency 25KHz, speed 1000mm / s, current: 1A, marking into 30mm×30mm squares in the flat plate for color measurement test;

[0098] Color measurement method: Use a spectrophotometer in reflection mode to measure the L* value, a* value, and b* value of the color of a 30mm×30mm square before and after laser marking in the CIE Lab color space. The spectrophotometer is the Color-Eye 7000A spectrophotometer from X-rite. By measuring the spectral reflectance factor or spectral transmittance of the object, the three stimulus values ​​of the sample color are calculated and converted into CIE Lab;

[0099] L* represents lightness, ranging from 0 to 100, indicating that the color ranges from dark (black) to light (white).

[0100] a* represents red and green, and the value changes from positive to negative, indicating that the color changes from red to green.

[0101] b* represents yellow-blue, and the value changes from positive to negative, indicating that the color changes from yellow to blue.

[0102] DL* is the difference in lightness, with positive values ​​being lighter (white) and negative values ​​being darker (black).

[0103] Da* is the difference between red and green, with positive values ​​indicating more red and negative values ​​indicating more green.

[0104] Db* is the difference between yellow and blue, with positive values ​​indicating more yellow and negative values ​​indicating more blue.

[0105] DE represents the total color difference. The calculation formula is as follows:

[0106] DE=(DL*^2+Da*^2+Db*^2)^0.5

[0107] The greater the DE value of the color change before and after laser marking, the more it can reflect the marking contrast of the material;

[0108] Marking effect evaluation: if the pattern obtained by marking is (30±1mm)×(30±1mm) under visible light, the marking is controllable; if the pattern obtained by marking is not within the range of (30±1mm)×(30±1mm) under visible light, the marking is uncontrollable;

[0109] Marking color durability test: After placing the marked sample under visible light for 500 hours, measure the color parameters and record whether the color can be maintained. Calculate the color difference between the color just after marking and the color after being placed under visible light for 500 hours; the smaller the color difference, the better the durability. Specifically: color difference values ​​greater than or equal to 10 are recorded as +, color difference values ​​between 5 and 10 (including 5, excluding 10) are recorded as +++, color difference values ​​between 2 and 5 (including 2, excluding 5) are recorded as ++++, and color difference values ​​less than 2 are recorded as +++++.

[0110] Examples 1 to 28 and Comparative Examples 1 to 13

[0111] The dosage of each component in the color laser marking composition in Examples 1 to 28 and Comparative Examples 1 to 13 and the performance test results are shown in Tables 1 to 3.

[0112] Table 1 Amount of each component in the color laser marking composition in Examples 1 to 17 (unit: weight parts) and test results

[0113]

[0114]

[0115]

[0116]

[0117] Table 2 Components (unit: weight parts) and test results of the color laser marking composition in Examples 18 to 28

[0118]

[0119]

[0120]

[0121] Table 3 Amount of each component in the laser marking composition in Comparative Examples 1 to 13 (unit: weight parts) and test results

[0122]

[0123]

[0124] It can be seen from Tables 1 to 2 that the color laser marking composition prepared in each embodiment of the present invention can be changed from white or color before marking to other colors, and the contrast is high. The color difference before and after marking is not less than 20, and the laser marking effect is controllable.

[0125] It can be seen from Examples 1 to 10 that the effect is better when ABS, PMMA or PS is used as the resin substrate, and the effect is best when PMMA is used.

[0126] It can be seen from Comparative Examples 1 to 10 that if no photosensitive reversible color powder is added, the color of the prepared laser marking composition after marking is black or gray, and no color effect can be formed.

[0127] It can be seen from Comparative Example 11 that if no ultraviolet absorber is added, even if the laser marking composition prepared by adding photosensitive reversible color powder can achieve color marking, the marking effect is uncontrollable and the non-marking area may also change color.

[0128] It can be seen from Comparative Example 12 that the conventional marking agent is used, and the marking is black, and no color marking can be produced.

[0129] It can be seen from Comparative Example 13 that if no visible light absorber is added, even if the marking is colorful, it will immediately fade to colorless under visible light and the color cannot be maintained.

[0130] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A color laser marking composition, characterized in that: The composition comprises the following components calculated by weight:

2. The color laser marking composition according to claim 1, characterized in that: The photosensitive reversible color powder includes one or more of spiropyran compounds, spirooxazine compounds, azobenzene compounds, diarylethene compounds or fulgide compounds; preferably, the photosensitive reversible color powder is one or more of azobenzene compounds, spirooxazine compounds or fulgide compounds.

3. The color laser marking composition according to claim 1, characterized in that: The resin includes one or more of polypropylene, polyethylene, polyvinyl chloride, polystyrene, polycarbonate, polyoxymethylene, polybutylene terephthalate, polyamide, acrylonitrile-butadiene-styrene terpolymer or polymethyl methacrylate; preferably, the resin is one or more of acrylonitrile-butadiene-styrene terpolymer, polymethyl methacrylate or polystyrene; more preferably, the resin is polymethyl methacrylate.

4. The color laser marking composition according to claim 1, characterized in that: The ultraviolet absorber includes one or more of benzophenone absorbers, benzotriazole absorbers or triazine absorbers; preferably, the ultraviolet absorber is a benzotriazole absorber and / or a triazine absorber.

5. The color laser marking composition according to claim 1, characterized in that: The visible light absorber includes 1-butyl-2-[5-(1-butyl-1,3-dihydro-3,3-dimethyl-2H-indol-2-ylidene)-penta-1,3-diphenyl]-3,3-dimethyl-3H-indole hexafluorophosphate, 2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3-pentadien-1-yl]-1,3,3-trimethyl-3H-indole chloride Compound, 2,4-bis[4-(diethylamino)-2-hydroxyphenyl] square acid, 3,3'-diethyloxacarbocyanine iodide, 3-butyl-2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3-pentadienyl]-1,1-dimethyl-1H-benzo[E]indole tetrafluoroborate, 4,5:4',5'-dibenzo-1,1'-dibutyl-3,3,3',3 '-Tetramethylindodicarbocyanine hexafluorophosphate, 1-butyl-5-[2-(1-butyl-3,3-dimethyl-1,3-dihydroindole-2-ylidene)ethylidene]-4-methyl-2,6-dioxo-1,2,5,6-tetrahydropyridine-3-carbonitrile, [5-[2-(3-ethyl-3H-benzothiazol-2-ylidene)ethylidene]-4-oxo-2-thionothiazolidin-3-yl]acetic acid, 2-[3-(3 One or more of: 1,3-butyl-1,3-dihydro-1,1-dimethyl-2H-benzo[E]indol-2-ylidene)-1-propen-1-yl]-1,1,3-trimethyl-1H-benzo[E]indole hexafluorophosphate or 2-[5-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)-1,3-pentadien-1-yl]-1,3,3-trimethyl-3H-indole tetrafluoroborate.

6. The color laser marking composition according to claim 1, characterized in that: The pigment includes one or more of white phase, red phase, yellow phase, green phase, blue phase or purple phase pigments.

7. The color laser marking composition according to claim 1, characterized in that: It also includes 0.1 to 2 parts of antioxidant and / or 0.5 to 5 parts of dispersant.

8. The color laser marking composition according to claim 7, characterized in that: The antioxidant includes hindered phenol antioxidant and / or phosphite antioxidant; the dispersant includes one or more of zinc stearate, calcium stearate, magnesium stearate, polyethylene wax or oxidized polyethylene wax.

9. A method for preparing the color laser marking composition according to any one of claims 1 to 8, characterized in that: The steps include: The components are mixed uniformly, melt-extruded and granulated to obtain a color laser marking composition.

10. Use of the color laser marking composition according to any one of claims 1 to 8 in the preparation of consumer electronic products.

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