Colored halogen-free flame-retardant nylon composite material capable of being subjected to ultraviolet laser marking as well as preparation method and application thereof

Abstract

The invention discloses a colored halogen-free flame-retardant nylon composite material capable of being subjected to ultraviolet laser marking as well as a preparation method and application thereof, and relates to a laser marking high polymer material. The colored nylon composite material is prepared from 60 to 75 parts of nylon resin, 0 to 40 parts of glass fiber, 12 to 20 parts of halogen-free flame retardant, 0.05 to 0.3 part of laser sensitive agent and 0.1 to 1 part of colored pigment, the laser sensitive agent is zinc sulfide and / or zinc oxide. According to the colored nylon composite material, the specific laser sensitive agent is added, electrons and holes are generated under excitation of ultraviolet light, the decomposition reaction of the material can be promoted, and then the laser marking effect is improved, so that white marks are marked on the colored nylon material through ultraviolet laser marking, the color difference before and after marking is obvious, and the marking quality is improved. High definition and contrast ratio are realized.

Description

Technical Field

[0001] The invention belongs to laser marking polymer materials, and in particular relates to a colored halogen-free flame-retardant nylon composite material capable of being marked by ultraviolet laser, and a preparation method and application thereof. Background Art

[0002] As one of the five major engineering plastics, polyamide (PA, nylon) is widely used in many fields such as automobiles, electronic appliances, household appliances and communication equipment due to its excellent comprehensive performance, and PA materials are often required to have high flame retardant properties. Halogen-free flame retardant nylon is gradually replacing traditional brominated flame retardant nylon due to its green environmental protection, low toxicity, low smoke, high heat resistance, high tracking index (CTI) and good comprehensive performance. Among them, the development and research of PA products in the hypophosphite system and phosphorus-nitrogen synergistic flame retardant system have become the key development trend.

[0003] When halogen-free flame-retardant nylon products are circulated as commodities, they often need to be marked with graphic descriptions on their surfaces. Traditional marking technologies mainly use ink pad printing and inkjet marking, etc., and their biggest advantages are wide color selection and a wide range of applicable materials, but this technology has defects such as high pollution, complex steps, and poor durability. Laser marking, as a new type of environmentally friendly marking technology, mainly uses high-energy lasers to act on the target surface, causing physical or chemical changes on the surface to obtain a mark. It has the characteristics of environmental protection, no pollution, simple steps, high durability and aesthetics.

[0004] In nylon products, the flame retardant component has a great influence on the laser marking effect due to the absorption and reflection of laser energy. For example, in brominated flame retardants, since bromine atoms have a higher atomic weight and electron density, the energy required for the transition of their outer electrons is more compatible with the common laser wavelength, especially when irradiated with a 1064nm near-infrared laser, it is easier to absorb energy and convert it into heat energy, and has a better laser marking effect. However, the absorption capacity of halogen-free flame retardant systems for lasers is usually weaker than that of bromine-based flame retardant systems, the clarity of marking is generally poor, and higher laser power is often required. At present, the laser marking methods used for halogen-free flame retardant nylon materials are mainly infrared and ultraviolet. In the prior art, the laser marking of halogen-free flame retardant nylon materials focuses on the infrared laser marking of dark substrates, and the halogen-free flame retardant nylon materials are formulated into dark or black colors to improve the laser absorption rate. However, there are very few reports on ultraviolet laser marking of colored nylon materials. Infrared laser marking has a high marking depth and a more durable marking effect. Unlike long-wave lasers that burn off surface materials through heat energy, ultraviolet laser marking uses short-wavelength lasers to break the molecular chains of materials, causing changes in the molecular structure, thereby changing the color of the marking area. It can greatly reduce the mechanical deformation of materials and has little processing heat impact, and the processing precision is higher, but the clarity and contrast of the marking area are low, and it can only be used for marking dark or black materials. Patent CN113025035A proposes a halogen-free flame-retardant nylon composite material that can be laser-marked. It uses nylon resin, halogen-free flame retardant, flame retardant synergist, laser marking powder, black masterbatch, adsorbent, glass fiber, antioxidant and lubricant to make the prepared nylon composite material have excellent flame retardancy and high temperature and humidity resistance, good tensile strength and bending strength, and good laser marking effect. However, this material needs to use black masterbatch (carbon black) to adjust the nylon material to a dark or black color in order to have a better laser marking effect; it is impossible to achieve laser marking of colored halogen-free flame-retardant nylon materials and form a marking area with high clarity and contrast. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects and shortcomings of existing halogen-free flame-retardant nylon materials and provide a colored nylon composite material capable of being marked by ultraviolet laser, which can be ultraviolet marked on colored materials and has high clarity and contrast.

[0006] Another object of the present invention is to provide a method for preparing a colored nylon composite material that can be marked by ultraviolet laser.

[0007] Another object of the present invention is to provide the use of the above-mentioned ultraviolet laser markable colored nylon composite material in the preparation of consumer electronic products.

[0008] The above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0009] The present invention protects a colored nylon composite material capable of being marked by ultraviolet laser, comprising the following components in parts by weight:

[0010] 60-75 parts of nylon resin,

[0011] Glass fiber 0-40 parts,

[0012] Halogen-free flame retardant 12-20 parts,

[0013] Laser sensitive agent 0.05-0.3 parts,

[0014] Color pigment 0.1-1 part,

[0015] The laser sensitive agent is zinc sulfide and / or zinc oxide.

[0016] In the colored nylon composite material of the present invention, nylon resin is used as the base resin, and a halogen-free flame retardant and a color pigment are combined to form a halogen-free flame retardant colored nylon system, and a specific laser sensitive agent is added, which generates electrons and holes under the excitation of ultraviolet light, can promote the decomposition reaction of the material and thus improve the laser marking effect, so that a white mark is marked on the colored nylon material by ultraviolet laser, and the color difference before and after marking is obvious, with high clarity and contrast.

[0017] It should be noted that

[0018] The color in the present invention refers to various colors other than the white and black series. Preferably, the color pigment includes but is not limited to at least one of red phase, yellow phase, green phase, blue phase or purple phase pigment. It should be understood by those skilled in the art that red phase pigment appears red under visible light, yellow phase pigment appears yellow under visible light, green phase pigment appears green under visible light, blue phase pigment appears blue under visible light, and purple phase pigment appears purple under visible light.

[0019] In some embodiments, the nylon resin content that can achieve the purpose of the present invention can be 60 parts, 61 parts, 62 parts, 63 parts, 64 parts, 65 parts, 66 parts, 67 parts, 68 parts, 69 parts, 70 parts, 71 parts, 72 parts, 73 parts, 74 parts, 75 parts or any value within the range of above.

[0020] Preferably, the mass fraction of the nylon resin in the colored nylon composite material is 45-85%.

[0021] Preferably, the glass fiber is 10-40 parts, more preferably 14-30 parts.

[0022] More preferably, the glass fiber content can be 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 26 parts, 26 parts, 28 parts, 29 parts, 30 parts or any value within the range of above.

[0023] In some embodiments, the content of the halogen-free flame retardant that can achieve the purpose of the present invention can be 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts or any value within the range of above.

[0024] In some embodiments, the content of the laser sensitizer that can achieve the purpose of the present invention can be 0.05 parts, 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts or any value within the range above.

[0025] In some of the embodiments, the color pigment content that can achieve the purpose of the present invention can be 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1.0 part or any value within the range above.

[0026] In some embodiments, the pigment includes an inorganic color pigment and / or an organic color pigment; the organic color pigment is one or more of azo, phthalocyanine, anthraquinone or aromatic amine pigments.

[0027] Optionally, the red phase pigment is an inorganic red pigment and / or an organic red pigment; the inorganic red pigment is ferric oxide (iron red) or cerium sulfide red; the organic red pigment is 4-cyano-5-[[5-cyano-2,6-bis[(3-methoxypropyl)amino]-4-methyl-3-pyridyl]azo]-3-methyl-2-thiophenecarboxylic acid methyl ester.

[0028] Optionally, the yellow pigment is an inorganic yellow pigment and / or an organic yellow pigment; the inorganic yellow pigment is titanium chrome brown, Pigment Yellow 119 (zinc iron yellow); the organic yellow pigment is 2-(3-hydroxy-2-quinolyl)-1,3-indanedione (Solvent Yellow 114).

[0029] Optionally, the green phase pigment is an inorganic green pigment and / or an organic green pigment; the inorganic green pigment is Pigment Green 50 (titanium cobalt green); the organic green pigment is phthalocyanine green or 1,4-di-p-toluaminoanthraquinone.

[0030] Optionally, the blue phase pigment is an inorganic blue pigment and / or an organic blue pigment; the inorganic blue pigment is Pigment Blue 29 (Ultramarine Blue); the organic blue pigment is phthalocyanine blue or 1,4-bis[(2,4,6-trimethylphenyl)amino]-9,10-anthracenedione.

[0031] Optionally, the violet pigment is an inorganic violet pigment and / or an organic violet pigment; the inorganic violet pigment is ultramarine violet; and the organic violet pigment is solvent violet 37.

[0032] In some embodiments, the nylon resin is one or more of PA6, PA66, PA46, PPA, PA12, PA610, PA1010, PA1012 or PA1212.

[0033] In some embodiments, the melt flow rate of the nylon resin at 250° C. and 0.325 kg is 0.5 to 30 g / 10 min; the test standard for the melt flow rate is ISO 1133-1:2011.

[0034] In some embodiments, the glass fiber is one or more of alkali-free short glass fiber, medium-alkali short glass fiber or high-alkali short glass fiber. Preferably, the short glass fiber is a hydrolysis-resistant alkali-free short glass fiber. Preferably, the diameter of the glass fiber is 10-20 microns. Increasing the content of glass fiber is conducive to improving mechanical properties, but will reduce the marking effect. The present invention controls the content of the glass fiber to obtain a product with qualified mechanical properties and excellent marking effect.

[0035] In some embodiments, the halogen-free flame retardant is one or more of organic hypophosphite, inorganic phosphite, melamine phosphate, zinc borate, and magnesium hydroxide.

[0036] Preferably, the halogen-free flame retardant is an organic hypophosphite, melamine phosphate and zinc borate in a mass ratio of (4-8):(0.5-2):1.

[0037] In some embodiments, the invention further comprises 0.1-0.3 parts of antioxidant and 0.3-0.6 parts of lubricant.

[0038] Optionally, the antioxidant is at least one of phosphites, hindered phenols and thioesters; preferably hindered phenols.

[0039] Optionally, the lubricant is at least one of hydrocarbons, fatty acid amides, higher fatty acids, esters, alcohols, metal soaps and composite lubricants. Preferably, fatty acid esters and metal soaps are compounded, and more preferably, the mass ratio of fatty acid esters to metal soaps is (2-3):1, which has good internal and external lubrication.

[0040] The invention protects a method for preparing a colored nylon composite material capable of being marked by ultraviolet laser, comprising the following steps: uniformly mixing various components, melt-extruding, and granulating to obtain the nylon composite material capable of being marked by ultraviolet laser.

[0041] In some embodiments, the temperature of the melt extrusion is 220-280°C.

[0042] In some embodiments, the melt extrusion is performed using a twin-screw extruder. Specifically, the twin-screw extruder has an aspect ratio of 25 to 50:1 and a screw speed of 200 to 600 rpm.

[0043] The invention protects the use of a colored nylon composite material capable of being marked by ultraviolet laser in the preparation of consumer electronic products; the composite material is particularly suitable for marking colored materials.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The present invention provides a colored nylon composite material, in which nylon resin is used as a matrix resin, and a halogen-free flame retardant and a color pigment are combined to form a halogen-free flame retardant colored nylon system, and a specific laser sensitizer is added. The laser sensitizer generates electrons and holes under the excitation of ultraviolet light, which can promote the decomposition reaction of the material and thus improve the laser marking effect, so that a white mark is marked on the colored nylon material by ultraviolet laser, and the color difference before and after marking is obvious, with high clarity and contrast. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 The present invention provides a physical picture of laser marking of a colored nylon composite material. DETAILED DESCRIPTION

[0047] 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.

[0048] The raw materials used in the following examples and comparative examples are as follows:

[0049] Nylon resin:

[0050] PA66 1#: EP158NH, Huafeng Group Co., Ltd.; the melt flow rate at 275°C and 2.16kg is 90g / 10min.

[0051] PA66 2#: PA66 T42, Huafeng Group Co., Ltd.; melt flow rate at 275°C, 2.16kg is 10g / 10min.

[0052] PA6: HY2000A, Jiangsu Haiyang Chemical Fiber Co., Ltd.; melt flow rate at 250°C, 0.325kg is 29g / 10min.

[0053] Glass fiber: alkali-free short glass fiber, ECS303W-3-K, Chongqing International Composite Materials Co., Ltd.

[0054] Halogen-free flame retardant 1#: Organic hypophosphite, melamine phosphate and zinc borate are compounded in a mass ratio of 6:1:1. Among them, the organic hypophosphite is diethyl aluminum hypophosphite, HR8866S, Weihai Hairun New Materials Technology Co., Ltd.; melamine phosphate: BUDIT 3141, Budenheim Iberica, Germany; zinc borate: ZB-503, Anhui Yishitong Materials Technology Co., Ltd.

[0055] Halogen-free flame retardant 2#: Aluminum phosphite: Shaoguan Hongcheng Technology Co., Ltd.

[0056] Antioxidant: Hindered phenol antioxidant, RIANOX 1098, was purchased from Tianjin Li'anlong New Materials Co., Ltd.

[0057] Lubricant: a compound of fatty acid ester external lubricant and metal soap internal lubricant in a mass ratio of 5:2. Fatty acid ester external lubricant: TR044W, Struktol, USA; Metal soap internal lubricant: Licomont NaV101, Guangzhou Fengtian Chemical Co., Ltd.

[0058] Laser sensitizer:

[0059] Zinc sulfide: HD-S, Sachshalbenchemie GmbH, Germany.

[0060] Zinc oxide: Shanghai MacLean Biochemical Technology Co., Ltd.

[0061] Basic copper phosphate: Guangdong Wengjiang Chemical Reagent Co., Ltd.

[0062] Antimony trioxide: Shanghai Zhaoqian Chemical Co., Ltd.

[0063] Pigment 1#: Inorganic red pigment, ferric oxide, Lingshou County Quanfeng Mineral Products Processing Plant.

[0064] Pigment 2#: Inorganic red pigment, cerium sulfide red, Hunan Kelai New Materials Co., Ltd.

[0065] Pigment 3#: organic red pigment, 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), Kunshan Yuanyuan Plastic Pigment Co., Ltd.

[0066] Pigment 4#: inorganic yellow pigment, titanium chrome brown, purchased from Foshan Dachangshun Material Technology Co., Ltd.

[0067] Pigment 5#: Inorganic yellow pigment, Pigment Yellow 119 (zinc iron yellow), Anhui Jingzhicai New Materials Co., Ltd.

[0068] Pigment 6#: organic yellow pigment, 2-(3-hydroxy-2-quinolyl)-1,3-indanedione (Solvent Yellow 114), TECHSOLYELLOW E3G, purchased from Shenzhen Dingtai Chemical Co., Ltd.

[0069] Pigment 7#: Inorganic green pigment, Pigment Green 50 (Titanium Cobalt Green), Foshan Dachangshun Material Technology Co., Ltd.

[0070] Pigment 8#: organic green pigment, phthalocyanine green (pigment green 7), PV FAST GREEN GNX, CLARIANT CHEMICALS.

[0071] Pigment 9#: Inorganic blue pigment, Ultramarine Blue (Pigment Blue 29), Hubei Shineng Chemical Technology Co., Ltd.

[0072] Pigment 10#: Organic blue pigment, phthalocyanine blue (pigment blue 15), BF1535, Xuancheng Yabang Chemical Co., Ltd.

[0073] Pigment 11#: Inorganic purple pigment, Ultramarine Violet, Shenzhen Daxing Chemical Co., Ltd.

[0074] Pigment 12#: Organic purple pigment, solvent violet 37, Ningbo Longxin Fine Chemical Co., Ltd.

[0075] The following examples and comparative examples of the preparation method of the ultraviolet laser markable colored nylon composite material include the following steps: using a twin-screw extruder with a length-to-diameter ratio of 48:1 (double-side feeding, high vacuum), nylon resin, antioxidant, lubricant, laser sensitive agent and color pigment are mixed evenly and then mainly fed into the twin-screw extruder, and the side feeding is respectively in the fifth zone and the eighth zone, the fifth zone is fed with halogen-free flame retardant, and the eighth zone is fed with short glass fiber, and the ultraviolet laser markable nylon composite material is obtained by melt extrusion and granulation; the temperature of the melt extrusion is 240°C, and the speed of the twin-screw extruder is 250rpm.

[0076] Examples 1 to 25

[0077] This embodiment provides a series of colored nylon composite materials that can be marked by ultraviolet laser, and the raw material components are shown in Table 1-2.

[0078] Table 1 Component dosage of Examples 1 to 12 (parts by weight)

[0079]

[0080]

[0081] Table 2 Component dosage of Examples 13 to 25 (parts by weight)

[0082]

[0083]

[0084] Comparative Examples 1 to 5

[0085] This comparative example provides a series of colored nylon composite materials that can be marked by ultraviolet laser, and the raw material components are shown in Table 3.

[0086] Table 3 Component dosage of comparative examples 1 to 5 (parts by weight)

[0087]

[0088] Performance Testing

[0089] 1. UV laser marking test

[0090] The UV laser markable nylon composite materials prepared in each embodiment and comparative example were UV laser marked according to the following method and related tests were performed. The results are shown in Tables 4-6 and Figure 1 shown.

[0091] UV laser marking method: using the Han’s Laser UV laser marking machine UV-3X (laser beam output power of 3W), the laser wavelength of 355nm, laser marking process: frequency 25KHz, speed 1000mm / s, pulse width 33μs; current: 1A, marking into 30mm×30mm squares in the flat plate for color measurement test.

[0092] 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;

[0093] L* represents lightness, ranging from 0 to 100, indicating that the color ranges from dark (black) to light (white).

[0094] a* represents red and green, and the value changes from positive to negative, indicating that the color changes from red to green.

[0095] b* represents yellow-blue, and the value changes from positive to negative, indicating that the color changes from yellow to blue.

[0096] DL* is the difference in lightness, with positive values ​​being lighter (white) and negative values ​​being darker (black).

[0097] Da* is the difference between red and green, with positive values ​​indicating more red and negative values ​​indicating more green.

[0098] Db* is the difference between yellow and blue, with positive values ​​indicating more yellow and negative values ​​indicating more blue.

[0099] DE represents the total color difference. The calculation formula is as follows:

[0100] DE=(DL*^2+Da*^2+Db*^2)^0.5

[0101] The greater the DE value of the color change in the area before and after laser marking, the more it can reflect the marking contrast of the material.

[0102] 2. Mechanical properties and flame retardancy test:

[0103] Tensile strength: tested in accordance with GB / T 1040-2018 standard; tensile speed is 10mm / min.

[0104] Simple supported beam notched impact strength: tested in accordance with GB / T 1043.1-2008 standard, test conditions: 4mm thickness, injection molded A-type notched specimen, 23℃.

[0105] Flame retardancy test: Vertical burning flame retardancy refers to GB / T 2408-2008 standard, measured by vertical-horizontal burning measuring instrument, sample thickness is 1.6mm.

[0106] Figure 1 From left to right in the figure are materials of Examples 4, 13, 17 and 19, respectively, using solvent red 195, titanium chrome brown, phthalocyanine green (pigment green 7), phthalocyanine blue (pigment blue 15) as color pigments, the upper figure is a matrix after 355nm laser marking under different parameters (pulse widths are 5, 15, 25 and 33μs, respectively; speeds are 600, 1000, 1400 and 1800mm / s, respectively, and frequency is 25kHz); the lower figure is a square with a pulse width of 25μs and 33μs (speed 1000mm / s, frequency 25kHz) marked respectively; it can be seen that the material of the present invention has obvious color difference before and after marking, and also has high clarity and contrast at a lower laser output power.

[0107] Table 4

[0108]

[0109]

[0110] Table 5

[0111]

[0112]

[0113] Table 6

[0114]

[0115] It can be seen from Tables 4-6 that the DE value of the color change of the color nylon composite material of the present invention before and after laser marking is above 21.41, especially for the nylon composite material containing pigment green 50 (titanium cobalt green), the DE value can reach 37.83, while the tensile strength is above 105Mpa, and the notched impact strength is 6.1KJ / m 2 Above, the flame retardancy reaches V-0 level.

[0116] Compared with Example 2, Comparative Example 1 does not contain a laser sensitizer, and the DE value of the color change of the area before and after marking is significantly reduced, and the contrast is low.

[0117] In Comparative Example 2, basic copper phosphate is used as a laser sensitizer. Basic copper phosphate is expensive and has a high cost, which is not conducive to industrial application. In addition, its DE value for ultraviolet laser marking in a colored nylon system is low.

[0118] When the zinc sulfide content in Comparative Example 3 is too high, the flame retardant performance will be reduced.

[0119] The nylon composite material in Comparative Example 4 does not contain pigment, and fails to cover up the defect that zinc sulfide turns grayish yellow under ultraviolet laser, and the color turns gray after marking.

[0120] When antimony trioxide is used as the laser sensitizer in Comparative Example 5, the DE value after ultraviolet laser marking is significantly reduced.

[0121] 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 colored nylon composite material capable of being marked by ultraviolet laser, characterized in that: The composition comprises the following components in parts by weight: 60-75 parts of nylon resin, Glass fiber 0-40 parts, Halogen-free flame retardant 12-20 parts, Laser sensitive agent 0.05-0.3 parts, Color pigment 0.1-1 part, The laser sensitive agent is zinc sulfide and / or zinc oxide.

2. The UV laser markable colored nylon composite material according to claim 1, characterized in that: The nylon resin is one or more of PA6, PA66, PA46, PPA, PA12, PA610, PA1010, PA1012 or PA1212.

3. The UV laser markable colored nylon composite material according to claim 1 or 2, characterized in that: The melt flow rate of the nylon resin at 250° C. and 0.325 kg is 0.5 to 30 g / 10 min.

4. The UV laser markable colored nylon composite material according to claim 1, characterized in that: The glass fiber is one or more of alkali-free short glass fiber, medium-alkali short glass fiber or high-alkali short glass fiber.

5. The UV laser markable colored nylon composite material according to claim 1, characterized in that: The halogen-free flame retardant is one or more of organic hypophosphite, inorganic phosphite, melamine phosphate, zinc borate and magnesium hydroxide.

6. The UV laser markable colored nylon composite material according to claim 5, characterized in that: The halogen-free flame retardant is an organic hypophosphite, a melamine phosphate and a zinc borate in a mass ratio of (4-8):(0.5-2):

1.

7. The UV laser markable colored nylon composite material according to claim 1, characterized in that: The color pigments include inorganic color pigments and / or organic color pigments; The organic color pigment is one or more of azo, phthalocyanine, anthraquinone or aromatic amine pigments; The inorganic color pigment is one or more of iron oxide, cerium sulfide, titanium chrome brown, zinc iron yellow, titanium cobalt green, ultramarine blue and ultramarine violet.

8. The UV laser markable colored nylon composite material according to claim 1, characterized in that: It also includes 0.1-0.3 parts of antioxidant and 0.3-0.6 parts of lubricant.

9. A method for preparing a colored nylon composite material capable of UV laser markability according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: uniformly mixing the components, melt-extruding and granulating to obtain the colored nylon composite material capable of ultraviolet laser marking.

10. Use of the ultraviolet laser markable colored nylon composite material according to any one of claims 1 to 8 in the preparation of consumer electronic products.

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