Near-infrared transmitting resin composition, and method for producing and use thereof

Abstract

The application provides a near-infrared transmitting resin composition and a preparation method and application thereof, and belongs to the field of laser welding. The resin composition comprises the following components in parts by weight: 100 parts of a thermoplastic resin and 0.03-1.0 parts of a light-transmitting black organic mixture. The infrared transmitting resin composition provided by the application can be used to prepare a black plastic product with high light transmittance in the near-infrared range through extrusion injection molding. The black plastic product has very low light transmittance in the visible light range (380-750 nm) and very high light transmittance in the near-infrared range (780-1200 nm). The black plastic product prepared by the application is suitable for laser transmission welding and solves the problems existing in the laser transmission welding of the existing black plastic products. Meanwhile, the preparation method is simple in process, simple in operation control, stable in quality, high in production efficiency, can be mass-produced in industry, and has a good application prospect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of laser welding, and particularly relates to a near-infrared transmitting resin composition and a preparation method and use thereof. BACKGROUND

[0002] As a commonly used material, plastic is widely used in industrial manufacturing and daily necessities due to its low cost, high strength, stable chemical properties, strong corrosion resistance and other characteristics, and has become the second largest material system next to metal, and its products have a wider application range than metal materials, and gradually replace metals and other materials in some application fields.

[0003] Due to the influence of extrusion and injection molding processes and other factors, many plastic products with complex shapes and structures cannot be formed at one time, and often need to be bonded by multiple parts, so there is an urgent need for a convenient and fast connection processing method.

[0004] In recent years, various methods for connecting plastic parts have emerged. They are mainly divided into two categories. One is the traditional connection method, which includes mechanical fastening and bonding. The other is the most commonly used welding method, which is mainly divided into friction heating, electromagnetic heating and convection heating. However, with the development of the times, the above methods have become more and more difficult to meet people's demand for plastic products. The traditional connection method has low strength, rough weld, and poor appearance of the joint, which cannot meet the high-quality welding of plastic. Therefore, laser transmission welding emerges as the times require, and its weld is precise, firm and sealed. Due to the non-contact characteristics of laser, the vibration stress and thermal stress generated during welding are greatly reduced, thus making up for the shortcomings of conventional plastic connection and welding methods.

[0005] The principle of plastic laser transmission welding is that two plastic products are overlapped and tightly clamped together with appropriate pressure, near-infrared laser NIR (wavelength 780-1200 nm) is transmitted through the upper product (laser transmission) and then absorbed by the upper surface of the other product (laser absorption). The lower product that absorbs laser energy converts light energy into heat energy, which melts the contact surface of the upper plastic product, and the heat is transferred to the surface of the upper plastic product, forming a molten zone. Under the action of clamping force, the molten zones of the two products are in close contact. Under the combined action of the internal force generated by the thermal expansion of plastic and the clamping force, the molten zone is fused, and then a weld is formed during the cooling process, so that the two products are tightly connected.

[0006] Laser transmission welding is mainly for thermoplastic polymers. This method has certain requirements for the two materials to be welded. In order to realize the laser welding of the two, the optical absorption performance of the two plastic products to be welded at a specific near-infrared laser wavelength needs to be exactly opposite. The upper plastic product should transmit laser as much as possible, and the lower plastic product should have high absorption. In the laser welding process, the high-absorbing product absorbs light energy to cause rapid temperature rise, surface melting and energy transfer to the upper light-transmitting plastic product through heat conduction. Under the action of clamping force, the two products are tightly combined together. However, it should be noted that the absorption of the upper plastic product to the specific wavelength laser should be as small as possible. Furthermore, the reflectivity of the two products to the specific laser wavelength should be kept to a minimum, because with the increase of light reflection, more laser energy is needed to meet the heat required for welding.

[0007] The transmittance of plastic to laser is an important factor affecting the plastic laser transmission welding. The roughness of the surface of the plastic product, the type of plastic, the wall thickness, and the type and amount of colorant all affect the transmission of plastic to laser. Studies have shown that the transmittance of polymer to near-infrared laser must be at least 15% or more in order to achieve good welding of the product by laser. Under normal circumstances, the absorption of black plastic at the laser wavelength can reach 90% to 95%, and the laser is almost impossible to penetrate, so laser welding cannot be implemented. Therefore, it is difficult to use laser welding to weld two black plastic products together.

[0008] The absorption of plastic to laser is another important factor affecting the plastic laser welding. The essence of plastic laser transmission welding is to melt the plastic to be welded in the laser action area, and then cool naturally to achieve the fusion between the plastic products. Plastic melting requires sufficient laser energy. Generally, without the addition of an absorber, the absorption of plastic to laser is very low, and the melting efficiency is poor. Therefore, in order to achieve good welding, a laser absorber needs to be added to the lower product to increase the absorption of plastic, thereby greatly increasing the heat absorption effect of plastic, making the plastic in the laser action area melt faster and the welding effect better.

[0009] In view of the technical difficulties of laser transmission welding of black plastic products, it is necessary to develop a black plastic material with high light transmittance at a specific laser wavelength. SUMMARY

[0010] In order to overcome the shortcomings of the current laser welding technology, the purpose of the present application is to provide a near-infrared transmission resin composition, a preparation method and use thereof. The resin composition is a black resin composition with high light transmittance in the near-infrared laser wavelength range, which can be well applied to laser welding.

[0011] Another object of the present application is to provide a black plastic product having high light transmittance in the near-infrared laser wavelength range, which has a large optical absorption coefficient in the visible light range (wavelength 380-750 nm) and a large light transmittance coefficient in the near-infrared range (wavelength 780-1200 nm).

[0012] Another object of the present application is to provide a method for preparing the above-mentioned black plastic product, which is simple in process, easy to operate, good in quality, high in production efficiency, and can be mass-produced in industry.

[0013] To achieve the objects of the present application,

[0014] The present application provides a near-infrared transmitting resin composition, which comprises the following components in parts by weight:

[0015] Thermoplastic resin 100 parts

[0016] Light-transmitting black organic mixture 0.03-1.0 parts;

[0017] The thermoplastic resin is any one of polypropylene resin, polyethylene resin, polyformaldehyde resin, polymethyl methacrylate, polystyrene, polycarbonate, styrene-acrylonitrile copolymer, styrene-methyl methacrylate copolymer, nylon 6 resin, and nylon 66 resin;

[0018] The light-transmitting black organic mixture is a condensed ring organic compound of anthracene series having a carbonyl group at C9 and C10, or is composed of a condensed ring organic compound of anthracene series having a carbonyl group at C9 and C10, an organic compound of pyrenone series, and an organic compound of anthrapyridone series.

[0019] Further, the resin composition comprises the following components in parts by weight:

[0020] Thermoplastic resin 100 parts

[0021] Light-transmitting black organic mixture 0.1-0.3 parts.

[0022] The black plastic product prepared by using the light-transmitting black organic mixture of the present application has high light transmittance in the near-infrared range (780 nm-1200 nm) and high light absorption in the visible light range (380 nm-750 nm).

[0023] Further,

[0024] The light-transmissive black organic mixture is composed of three fused ring organic compounds of anthracene series having carbonyl at C9, C10 position, or composed of two fused ring organic compounds of anthracene series having carbonyl at C9, C10 position, one organic compound of pyrenone series, and one organic compound of anthrapyridone series.

[0025] Further, when the light-transmissive black organic mixture is composed of three fused ring organic compounds of anthracene series having carbonyl at C9, C10 position,

[0026] The fused ring organic compounds of anthracene series having carbonyl at C9, C10 position are selected from any three of 1-methylaminoanthracene acid, 1,4-bis(ethylamino)-9,10-anthracenedione, 4-hydroxy-3-(2-hydroxynaphthalene azo) benzene sulfonic acid sodium, 1,4-bis(p-tolylamino) anthraquinone, 6,15-dihydrodianthrapyridazine-5,9,14,18-tetraone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, 4,4'-diamino-[1,1'-binaphthalene]-9,9',10,10'-tetraone, 1,5-bis[(3-methylphenyl)amino]-9,10-anthraquinone;

[0027] Preferably, the weight ratio of the three fused ring organic compounds of anthracene series having carbonyl at C9, C10 position is 1.5-3:5-7:2-3.

[0028] Further, when the light-transmissive black organic mixture is composed of two fused ring organic compounds of anthracene series having carbonyl at C9, C10 position, one organic compound of pyrenone series, and one organic compound of anthrapyridone series,

[0029] The fused ring organic compounds of anthracene series having carbonyl at C9, C10 position are selected from any two of 1-methylaminoanthracene acid, 1,4-bis(ethylamino)-9,10-anthracenedione, 4-hydroxy-3-(2-hydroxynaphthalene azo) benzene sulfonic acid sodium, 1,4-bis(p-tolylamino) anthraquinone, 6,15-dihydrodianthrapyridazine-5,9,14,18-tetraone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, 4,4'-diamino-[1,1'-binaphthalene]-9,9',10,10'-tetraone, 1,5-bis[(3-methylphenyl)amino]-9,10-anthraquinone;

[0030] the anthraquinone series of organic compounds is selected from any one of 3-methyl-6-(cyclohexylamino)-3H-dibenzo[F,IJ]isoquinoline-2,7-dione, 4-cyclohexylamino-N-methyl-1(N),9-anthraquinone, 4-p-toluidino-N-methyl-1(N),9-anthraquinone, 6-bromo-4-methyl-1-phenylanthraquinone.

[0031] the anthraquinone series of organic compounds is selected from any one of 3-methyl-6-(cyclohexylamino)-3H-dibenzo[F,IJ]isoquinoline-2,7-dione, 4-cyclohexylamino-N-methyl-1(N),9-anthraquinone, 4-p-toluidino-N-methyl-1(N),9-anthraquinone, 6-bromo-4-methyl-1-phenylanthraquinone.

[0032] Further, the weight ratio of the fused ring organic compound of the anthracene series of organic compounds having carbonyl groups at C9 and C10 positions, the organic compound of the pyrrone series, and the organic compound of the anthraquinone series is 1.5-3:1-3:2-4:4-5.5.

[0033] The black plastic product prepared by using the raw materials with the weight ratio of the present application has high light transmittance in the near infrared region (780nm-1200nm) and high light absorption in the visible light region (380nm-750nm).

[0034] The present application also provides the use of the aforementioned near infrared transmitting resin composition in the preparation of a plastic product with high light transmittance at near infrared light wavelength.

[0035] Preferably, the plastic product is a black plastic product.

[0036] More preferably, the near infrared light wavelength is 780nm-1200nm.

[0037] The present application also provides a plastic product with high light transmittance at near infrared light wavelength, which is prepared by using the aforementioned near infrared transmitting resin composition as raw materials.

[0038] Preferably, the plastic product is a black plastic product.

[0039] More preferably, the near infrared light wavelength is 780nm-1200nm.

[0040] The ratio of the transmittance of the plastic product containing the light-transmitting black organic mixture to the transmittance of the plastic product itself is 0.7-0.98 (in the near-infrared wavelength range).

[0041] The present application also provides a method for preparing the aforementioned plastic product with high transmittance in the near-infrared wavelength range, which comprises the following steps:

[0042] (1) mixing the thermoplastic resin and the light-transmitting black organic mixture in the aforementioned near-infrared transmitting resin composition;

[0043] (2) extruding and granulating the mixture with an extruder;

[0044] (3) injection molding the granulated pellets to obtain the product.

[0045] The present application also provides the use of the aforementioned near-infrared transmitting resin composition or the aforementioned plastic product as a material for laser transmission welding.

[0046] Compared with the prior art, the present application has the following advantages:

[0047] The present application provides an infrared transmitting resin composition, which can be used to prepare a black plastic product with high transmittance in the near-infrared range by extrusion injection molding. The black plastic product has very low transmittance in the visible light range (380-750 nm) and very high transmittance in the near-infrared range (780-1200 nm). The black plastic product prepared by the present application is suitable for laser transmission welding and solves the problems existing in the laser transmission welding of existing black plastic products. At the same time, the preparation method of the present application is simple, easy to operate and control, stable in quality, high in production efficiency, and can be mass-produced in industry, and has good application prospect.

[0048] Obviously, according to the above content of the present application, according to the ordinary technical knowledge and common means in the art, other various forms of modifications, replacements or changes can be made without departing from the above basic technical idea of the present application.

[0049] The above content of the present application will be further described in detail through the following embodiment. However, this should not be understood as limiting the scope of the above subject matter of the present application to the following examples. Any technology realized based on the above content of the present application belongs to the scope of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1Colorimetric diagram of the light-transmissive black plastic products prepared for Examples 1-10 and Comparative Examples 1-10: a is the colorimetric diagram of the light-transmissive black plastic products prepared for Examples 1-10 (1-10, 1 represents Example 1, 2 represents Example 2, …, 10 represents Example 10, corresponding in turn); b is the colorimetric diagram of the light-transmissive black plastic products prepared for Comparative Examples 1-10 (1-10, 1 represents Comparative Example 1, 2 represents Comparative Example 2, …, 10 represents Comparative Example 10, corresponding in turn).

[0051] Figure 2 Colorimetric diagram of the light-transmissive black plastic products prepared for Examples 11-20 and Comparative Examples 11-20: a is the colorimetric diagram of the light-transmissive black plastic products prepared for Examples 11-20 (1-10, 1 represents Example 11, 2 represents Example 12, …, 10 represents Example 20, corresponding in turn); b is the colorimetric diagram of the light-transmissive black plastic products prepared for Comparative Examples 11-20 (1-10, 1 represents Comparative Example 11, 2 represents Comparative Example 12, …, 10 represents Comparative Example 20, corresponding in turn).

[0052] Figure 3 Colorimetric diagram of the light-transmissive black plastic products prepared for Examples 21-30 and Comparative Examples 21-30: a is the colorimetric diagram of the light-transmissive black plastic PA6 prepared for Examples 21-30 (1-10, 1 represents Example 21, 2 represents Example 22, …, 10 represents Example 30, corresponding in turn); b is the colorimetric diagram of the light-transmissive black plastic PA6 prepared for Comparative Examples 21-30 (1-10, 1 represents Comparative Example 21, 2 represents Comparative Example 22, …, 10 represents Comparative Example 30, corresponding in turn). DETAILED DESCRIPTION

[0053] The raw materials and equipment used in the specific embodiments of the present application are all known products, which are obtained by purchasing commercially available products.

[0054] (1) The equipment used in the present application is as follows:

[0055] Double-screw extruder, screw diameter 35 mm, screw length-diameter ratio 36:1, produced by Nanjing Jianteng Electromechanical Co., Ltd.

[0056] Injection molding machine, model MA600, produced by Haitian Machinery Co., Ltd.

[0057] Laser welding machine, model MF-E-A2, fiber laser, maximum power of laser 20 W, wavelength of laser 1064 nm.

[0058] (2) The specific information of the base polymers used for preparing the standard bars in the present application is as follows:

[0059] Polypropylene (PP): Daqing Petrochemical, T30S (density: 0.900 g / cm3 ; melting temperature: 165°C

[0060] Poly(methyl methacrylate) (PMMA): Shandong Wanhua, HD01 (density: 0.940 g / cm 3 ; melting temperature: 185°C

[0061] Nylon 6 (PA6): DuPont, 73G15L (density: 1.16 g / cm 3 ; melting temperature: 215°C

[0062] Example 1

[0063] A plastic product with high light transmittance at near-infrared light wavelength, which is composed of raw materials in the following weight parts:

[0064] Thermoplastic resin 100 parts

[0065] Light-transmitting black organic mixture 0.10 parts;

[0066] The thermoplastic resin is polypropylene resin;

[0067] The light-transmitting black organic mixture is a mixture composed of 1-methylaminoanthracene acid, 1,4-bis(ethylamino)-9,10-anthracene dione, and 4-hydroxy-3-(2-hydroxynaphthalene azo) sodium benzenesulfonate in the anthracene series of fused ring organic compounds with carbonyl groups at C9 and C10, with a weight ratio of 1.5:5:2.

[0068] The raw materials are mixed by a high-speed blender, extruded and injection molded to obtain a black plastic product with high light transmittance in the near-infrared light wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0069] The ratio of the transmittance of the plastic PP containing the light-transmitting black organic mixture to the transmittance of pure plastic PP is 0.95 (in the near-infrared wavelength range: 780-1200 nm).

[0070] Example 2

[0071] A plastic product with high light transmittance at near-infrared light wavelength, which is composed of raw materials in the following weight parts:

[0072] Thermoplastic resin 100 parts

[0073] Light-transmitting black organic mixture 0.15 parts;

[0074] The thermoplastic resin is polypropylene resin;

[0075] The light-transmissive black organic mixture is a mixture of 1,4-bis(ethylamino)-9,10-anthracenedione, 4-hydroxy-3-(2-hydroxynaphthalene azo) sodium benzenesulfonate, and 1,4-di-p-toluidinoanthraquinone in the fused ring organic compound series of anthracene compounds having carbonyl groups at C9 and C10 positions, in a weight ratio of 1.8:5.5:2.3.

[0076] The raw materials are mixed by a high-speed mixer, and extrusion injection molding is performed to obtain a black plastic product having high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0077] The ratio of the transmittance of the plastic PP containing the light-transmissive black organic mixture to the transmittance of pure plastic PP is 0.92 (in the near-infrared wavelength range: 780-1200 nm).

[0078] Example 3

[0079] A plastic product having high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0080] Thermoplastic resin 100 parts

[0081] Light-transmissive black organic mixture 0.20 parts;

[0082] The thermoplastic resin is a polypropylene resin;

[0083] The light-transmissive black organic mixture is a mixture of 4-hydroxy-3-(2-hydroxynaphthalene azo) sodium benzenesulfonate, 1,4-di-p-toluidinoanthraquinone, and 6,15-dihydrodi-anthracenedipyridazine-5,9,14,18-tetraone in the fused ring organic compound series of anthracene compounds having carbonyl groups at C9 and C10 positions, in a weight ratio of 2.3:6.0:2.5.

[0084] The raw materials are mixed by a high-speed mixer, and extrusion injection molding is performed to obtain a black plastic product having high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0085] The ratio of the transmittance of the plastic PP containing the light-transmissive black organic mixture to the transmittance of pure plastic PP is 0.91 (in the near-infrared wavelength range: 780-1200 nm).

[0086] Example 4

[0087] A plastic product having high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0088] Thermoplastic resin 100 parts

[0089] Light-transmitting black organic mixture 0.25 parts;

[0090] The thermoplastic resin is a polypropylene resin;

[0091] The light-transmitting black organic mixture is a mixture of 1,4-di-p-tolylaminoanthraquinone, 6,15-dihydrodianthrylpyridazine-5,9,14,18-tetraone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide in the series of condensed ring organic compounds of anthracene compounds having carbonyl groups at C9, C10, in a weight ratio of 2.6:6.5:2.7.

[0092] The raw materials are mixed by a high-speed blender, extrusion injection molded to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0093] The ratio of the transmittance of the plastic PP containing the light-transmitting black organic mixture to the transmittance of pure plastic PP is 0.89 (in the near-infrared wavelength range: 780-1200 nm).

[0094] Example 5

[0095] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0096] Thermoplastic resin 100 parts

[0097] Light-transmitting black organic mixture 0.30 parts;

[0098] The thermoplastic resin is a polypropylene resin;

[0099] The light-transmitting black organic mixture is a mixture of 6,15-dihydrodianthrylpyridazine-5,9,14,18-tetraone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, 1,5-bis[(3-methylphenyl)amino]-9,10-anthraquinone in the series of condensed ring organic compounds of anthracene compounds having carbonyl groups at C9, C10, in a weight ratio of 3:7:3.

[0100] The raw materials are mixed by a high-speed blender, extrusion injection molded to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0101] The ratio of the transmittance of the plastic PP containing the light-transmitting black organic mixture to the transmittance of pure plastic PP is 0.85 (in the near-infrared wavelength range: 780-1200 nm).

[0102] Example 6

[0103] A plastic product with high transmittance at near-infrared light wavelength, which is composed of raw materials in the following weight parts:

[0104] Thermoplastic resin 100 parts

[0105] Light-transmitting black organic mixture 0.10 parts;

[0106] The thermoplastic resin is polypropylene resin;

[0107] The light-transmitting black organic mixture is composed of 4,4'-diamino-[1,1'-binaphthalene]-9,9',10,10'-tetrone, 1,5-bis[(3-methylphenyl)amino]-9,10-anthraquinone, bisbenzoimidazol[2,1-B:2',1'-I]benzo[LMN][3.8]phenanthroline-8,17-dione, 4-p-toluidino-N-methyl-1(N),9-anthrapyridone in the series of condensed ring organic compounds with carbonyl at C9, C10 position, in a weight ratio of 1.5:1:2:4.

[0108] The raw materials are mixed by high-speed mixer, extrusion injection molding, to obtain a black plastic product with high transmittance in the near-infrared light wavelength range, and the obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0109] The ratio of the transmittance of the plastic PP containing the light-transmitting black organic mixture to the transmittance of pure plastic PP is 0.90 (in the near-infrared wavelength range: 780-1200 nm).

[0110] Example 7

[0111] A plastic product with high transmittance at near-infrared light wavelength, which is composed of raw materials in the following weight parts:

[0112] Thermoplastic resin 100 parts

[0113] Light-transmitting black organic mixture 0.15 parts;

[0114] The thermoplastic resin is polypropylene resin;

[0115] The light-transmitting black organic mixture is composed of 1-methylaminoanthracene acid, 6,15-dihydrodianthrapyridazine-5,9,14,18-tetrone, 2-(3-hydroxy-2-quinolinyl)indane-1,3-dione, 4-cyclohexylamino-N-methyl-1(N),9-anthrapyridone in the series of condensed ring organic compounds with carbonyl at C9, C10 position, in a weight ratio of 1.8:1.5:2.5:4.4.

[0116] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0117] The ratio of the transmittance of the plastic PP containing the light-transmissive black organic mixture to the transmittance of pure plastic PP is 0.87 (in the near-infrared wavelength range: 780-1200 nm).

[0118] Example 8

[0119] A plastic product with high light transmittance in the near-infrared wavelength range, which consists of the following raw materials by weight:

[0120] Thermoplastic resin 100 parts

[0121] Light-transmissive black organic mixture 0.20 parts;

[0122] The thermoplastic resin is a polypropylene resin;

[0123] The light-transmissive black organic mixture is 1,4-bis(ethylamino)-9,10-anthracenedione, 4,4'-diamino-[1,1'-binaphthalene]-9,9',10,10'-tetrone, 2,4-dihydro-5-methyl-2-phenyl-4-phenylazo-3H-pyrazol-3-one of the pyrenone series, and 4-p-toluidino-N-methyl-1(N),9-anthrapyridone of the anthrapyridone series in the fused ring organic compound series of anthracene compounds with carbonyl groups at C9, C10, with a weight ratio of 2.3:2:3:4.8.

[0124] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0125] The ratio of the transmittance of the plastic PP containing the light-transmissive black organic mixture to the transmittance of pure plastic PP is 0.85 (in the near-infrared wavelength range: 780-1200 nm).

[0126] Example 9

[0127] A plastic product with high light transmittance in the near-infrared wavelength range, which consists of the following raw materials by weight:

[0128] Thermoplastic resin 100 parts

[0129] Light-transmissive black organic mixture 0.25 parts;

[0130] The thermoplastic resin is a polypropylene resin;

[0131] The light-transmissive black organic mixture is composed of 6,15-dihydrodianthradiazine-5,9,14,18-tetrone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, 4-[(1,5-dihydro-3-methyl-5-oxo-1-phenyl-4H-pyrazole-4-methylene)]-2,4-diketone, 6-bromo-4-methyl-1-phenylanthrapyridone in the series of condensed ring organic compounds of anthracene compounds with carbonyl at C9, C10 position, in a weight ratio of 3:3:4:5.5.

[0132] The raw materials are mixed by a high-speed blender, and extrusion injection molding is performed to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0133] The ratio of the transmittance of the plastic PP containing the light-transmissive black organic mixture to the transmittance of pure plastic PP is 0.82 (in the near-infrared wavelength range: 780-1200 nm).

[0134] Example 10

[0135] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0136] Thermoplastic resin 100 parts

[0137] Light-transmissive black organic mixture 0.30 parts;

[0138] The thermoplastic resin is a polypropylene resin;

[0139] The light-transmissive black organic mixture is composed of 6,15-dihydrodianthradiazine-5,9,14,18-tetrone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, 4-[(1,5-dihydro-3-methyl-5-oxo-1-phenyl-4H-pyrazole-4-methylene)]-2,4-diketone, 6-bromo-4-methyl-1-phenylanthrapyridone in the series of condensed ring organic compounds of anthracene compounds with carbonyl at C9, C10 position, in a weight ratio of 3:3:4:5.5.

[0140] The raw materials are mixed by a high-speed blender, and extrusion injection molding is performed to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0141] The ratio of the transmittance of the plastic PP containing the light-transmissive black organic mixture to the transmittance of the pure plastic PP is 0.75 (in the near-infrared wavelength range: 780-1200 nm).

[0142] Comparative Example 1

[0143] A plastic product with high light transmittance in the near-infrared light wavelength range, which is composed of raw materials in the following weight parts:

[0144] Thermoplastic resin 100 parts

[0145] Light-transmissive black organic mixture 0.10 parts;

[0146] The thermoplastic resin is a polypropylene resin;

[0147] The light-transmissive black organic mixture is a mixture composed of 1-methylamino anthracene acid, 1,4-bis(ethylamino)-9,10-anthracene dione, and 4-hydroxy-3-(2-hydroxynaphthalene azo) benzene sulfonic acid sodium in the series of condensed ring organic compounds of anthracene compounds with carbonyl groups at C9 and C10, with a weight ratio of 0.5:4:1.

[0148] The raw materials are mixed by a high-speed mixer, extruded and injection molded to obtain a black plastic product with high light transmittance in the near-infrared light wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0149] The ratio of the transmittance of the plastic PP containing the light-transmissive black organic mixture to the transmittance of the pure plastic PP is 0.90 (in the near-infrared wavelength range: 780-1200 nm).

[0150] Comparative Example 2

[0151] A plastic product with high light transmittance in the near-infrared light wavelength range, which is composed of raw materials in the following weight parts:

[0152] Thermoplastic resin 100 parts

[0153] Light-transmissive black organic mixture 0.15 parts;

[0154] The thermoplastic resin is a polypropylene resin;

[0155] The light-transmissive black organic mixture is a mixture composed of 1,4-bis(ethylamino)-9,10-anthracene dione, 4-hydroxy-3-(2-hydroxynaphthalene azo) benzene sulfonic acid sodium, and 1,4-di-p-toluidine anthraquinone in the series of condensed ring organic compounds of anthracene compounds with carbonyl groups at C9 and C10, with a weight ratio of 1:4.5:1.5.

[0156] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0157] The ratio of the transmittance of the plastic PP containing the light-transmitting black organic mixture to the transmittance of pure plastic PP is 0.85 (in the near-infrared wavelength range: 780-1200 nm).

[0158] Comparative Example 3

[0159] A plastic product with high light transmittance in the near-infrared wavelength range, which comprises the following raw materials by weight:

[0160] Thermoplastic resin 100 parts

[0161] Light-transmitting black organic mixture 0.20 parts;

[0162] The thermoplastic resin is a polypropylene resin;

[0163] The light-transmitting black organic mixture is a mixture composed of 4-hydroxy-3-(2-hydroxynaphthalene azo) sodium benzenesulfonate, 1,4-di-p-toluidine anthraquinone, and 6,15-dihydrodi-anthracenediazine-5,9,14,18-tetraone in an anthracene series of fused ring organic compounds with carbonyl groups at C9 and C10, in a weight ratio of 3.5:7.5:3.5.

[0164] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0165] The ratio of the transmittance of the plastic PP containing the light-transmitting black organic mixture to the transmittance of pure plastic PP is 0.79 (in the near-infrared wavelength range: 780-1200 nm).

[0166] Comparative Example 4

[0167] A plastic product with high light transmittance in the near-infrared wavelength range, which comprises the following raw materials by weight:

[0168] Thermoplastic resin 100 parts

[0169] Light-transmitting black organic mixture 0.25 parts;

[0170] The thermoplastic resin is a polypropylene resin;

[0171] The light-transmissive black organic mixture is a mixture of 1,4-di-p-tolylaminoanthraquinone, 6,15-dihydrodianthrylpyridazinedione-5,9,14,18-tetraone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide in the series of fused ring organic compounds of anthracene compounds having carbonyl groups at C9, C10, in a weight ratio of 4:8:4.

[0172] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range, and the obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0173] The ratio of the transmittance of the plastic PP containing the light-transmissive black organic mixture to the transmittance of pure plastic PP is 0.70 (in the near-infrared wavelength range: 780-1200 nm).

[0174] Comparative Example 5

[0175] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0176] Thermoplastic resin 100 parts

[0177] Light-transmissive black organic mixture 0.30 parts;

[0178] The thermoplastic resin is a polypropylene resin;

[0179] The light-transmissive black organic mixture is a mixture of 6,15-dihydrodianthrylpyridazinedione-5,9,14,18-tetraone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, 4,4'-diamino-[1,1'-binaphthalene]-9,9',10,10'-tetraone in the series of fused ring organic compounds of anthracene compounds having carbonyl groups at C9, C10, in a weight ratio of 4.5:8.5:4.5.

[0180] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range, and the obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0181] The ratio of the transmittance of the plastic PP containing the light-transmissive black organic mixture to the transmittance of pure plastic PP is 0.62 (in the near-infrared wavelength range: 780-1200 nm).

[0182] Comparative Example 6

[0183] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0184] Thermoplastic resin 100 parts

[0185] Light-transmissive black organic mixture 0.1 part;

[0186] The thermoplastic resin is a polypropylene resin;

[0187] The light-transmissive black organic mixture is 4,4'-diamino-[l,l'-binaphthyl]-9,9',10,10'-tetrone, 1,5-bis[(3-methylphenyl)amino]-9,10-anthraquinone, bisbenzoimidazol[2,l-B:2',l'-I]benzo[LMN][3.8]phenanthroline-8,17-dione, 3-methyl-6-(cyclohexylamino)-3H-dibenzo[F,IJ]isoquinoline-2,7-dione in the series of condensed ring organic compounds of anthracene compounds having carbonyl groups at C9, C10 positions, which are composed of weight ratio of 0.5:0.3:1.0:3.

[0188] The raw materials are mixed by a high-speed mixer, and extrusion injection molding is performed to obtain a black plastic product having high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0189] The ratio of the transmittance of the plastic product containing the light-transmissive black organic mixture to the transmittance of the pure plastic product is 0.92 (in the near-infrared wavelength range: 780-1200 nm).

[0190] Comparative Example 7

[0191] A plastic product having high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0192] Thermoplastic resin 100 parts

[0193] Light-transmissive black organic mixture 0.15 parts;

[0194] The thermoplastic resin is a polypropylene resin;

[0195] The light-transmissive black organic mixture is 1-methylaminoanthracene acid, 1,5-bis[(3-methylphenyl)amino]-9,10-anthraquinone, 2-(3-hydroxy-2-quinolinyl)indane-1,3-dione, 4-cyclohexylamino-N-methyl-1(N),9-anthrapyridone in the series of condensed ring organic compounds of anthracene compounds having carbonyl groups at C9, C10 positions, which are composed of weight ratio of 1:0.5:1.5:3.5.

[0196] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range, the obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0197] The ratio of the transmittance of the plastic PP containing the light-transmitting black organic mixture to the transmittance of the pure plastic PP is 0.84 (in the near-infrared wavelength range: 780-1200 nm).

[0198] Comparative Example 8

[0199] A plastic product with high light transmittance in the near-infrared wavelength range, which consists of the following raw materials by weight:

[0200] Thermoplastic resin 100 parts

[0201] Light-transmitting black organic mixture 0.20 parts;

[0202] The thermoplastic resin is a polypropylene resin;

[0203] The light-transmitting black organic mixture is 1,4-bis(ethylamino)-9,10-anthracenedione, 4,4'-diamino-[1,1'-binaphthalene]-9,9',10,10'-tetrone, 2,4-dihydro-5-methyl-2-phenyl-4-phenylazo-3H-pyrazol-3-one of the pyrenone series, and 4-p-toluidino-N-methyl-1(N),9-anthrapyridone of the anthrapyridone series in the fused ring organic compound series of anthracene compounds with carbonyl groups at C9, C10, with a weight ratio of 3.5:3.3:4.5:6.0.

[0204] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range, the obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0205] The ratio of the transmittance of the plastic PP containing the light-transmitting black organic mixture to the transmittance of the pure plastic PP is 0.73 (in the near-infrared wavelength range: 780-1200 nm).

[0206] Comparative Example 9

[0207] A plastic product with high light transmittance in the near-infrared wavelength range, which consists of the following raw materials by weight:

[0208] Thermoplastic resin 100 parts

[0209] Light-transmitting black organic mixture 0.25 parts;

[0210] The thermoplastic resin is a polypropylene resin;

[0211] The light-transmissive black organic mixture is composed of 6,15-dihydrodianthradiazine-5,9,14,18-tetrone, bis(3,5-dimethylphenyl) imidazole, 4-[(1,5-dihydro-3-methyl-5-oxo-1-phenyl-4H-pyrazole-4-methylene)]-2,4-dione, 6-bromo-4-methyl-1-phenylanthrapyridone in the series of condensed ring organic compounds of anthracene compounds with carbonyl at C9, C10 position, and sodium 4-hydroxy-3-(2-hydroxynaphthalene azo) benzene sulfonate, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide in a weight ratio of 4.5:4.1:5.5:7.0.

[0212] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range, and the obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0213] The ratio of the transmittance of the plastic PP containing the light-transmissive black organic mixture to the transmittance of pure plastic PP is 0.62 (in the near-infrared wavelength range: 780-1200 nm).

[0214] Comparative Example 10

[0215] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0216] Thermoplastic resin 100 parts

[0217] Light-transmissive black organic mixture 0.30 parts;

[0218] The thermoplastic resin is a polypropylene resin;

[0219] The light-transmissive black organic mixture is composed of 6,15-dihydrodianthradiazine-5,9,14,18-tetrone, bis(3,5-dimethylphenyl) imidazole, 4-[(1,5-dihydro-3-methyl-5-oxo-1-phenyl-4H-pyrazole-4-methylene)]-2,4-dione, 6-bromo-4-methyl-1-phenylanthrapyridone in the series of condensed ring organic compounds of anthracene compounds with carbonyl at C9, C10 position, and sodium 4-hydroxy-3-(2-hydroxynaphthalene azo) benzene sulfonate, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide in a weight ratio of 4.5:4.1:5.5:7.0.

[0220] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range, and the obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0221] The ratio of the transmittance of the plastic PP containing the light-transmissive black organic mixture to the transmittance of the pure plastic PP is 0.50 (in the near-infrared wavelength range: 780-1200 nm).

[0222] The light transmittance of the light-transmissive black plastic PP prepared in Examples 1-10 and Comparative Examples 1-10 is shown in Table 1.

[0223] Table 1. Light transmittance of the light-transmissive black plastic PP prepared in Examples 1-10 and Comparative Examples 1-10

[0224]

[0225]

[0226] As can be seen from Table 1, the light-transmissive black plastic PP of the present application has very low light transmittance in the visible light range (380-750 nm), but has very excellent light transmittance in the near-infrared wavelength range (780-1200 nm), while in the comparative examples deviating from the proportions of the present application, some plastic products also have the above-mentioned situation, but according to the principle of colorimetry, the plastic products prepared by these formulations do not reach black. The colorimetric diagram of the light-transmissive black plastic products prepared in Examples 1-10 and Comparative Examples 1-10 is shown in Figure 1 , it can be seen that in Figure 1 (a), the light-transmissive black plastic PP prepared in Examples 1-10 are all on the blackness line, while the light-transmissive black plastic PP prepared in Comparative Examples 1-10 are basically not on the blackness line, their hue does not belong to black, and do not meet the requirements of the present application for the product.

[0227] The above examples are better implementation schemes of the present application, in addition to this, the present application can also be implemented in other ways, and the substitutions made without departing from the concept of the present application are within the protection scope of the present application.

[0228] Example 11

[0229] A plastic product with high light transmittance in the near-infrared light wavelength range, which consists of the following raw materials in parts by weight:

[0230] Thermoplastic resin 100 parts

[0231] Light-transmissive black organic mixture 0.10 parts;

[0232] The thermoplastic resin is polymethyl methacrylate resin;

[0233] The light-transmissive black organic mixture is a mixture of 1-methylamino anthracene acid, 1,4-bis(ethylamino)-9,10-anthracene dione, and 4-hydroxy-3-(2-hydroxynaphthalene azo) sodium benzenesulfonate in the fused ring organic compound series of anthracene compounds having carbonyl groups at C9 and C10 in a weight ratio of 1.5:5:2.

[0234] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0235] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.97 (in the near-infrared wavelength range: 780-1200 nm).

[0236] Example 12

[0237] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0238] Thermoplastic resin 100 parts

[0239] Light-transmissive black organic mixture 0.15 parts;

[0240] The thermoplastic resin is a polymethyl methacrylate resin;

[0241] The light-transmissive black organic mixture is a mixture of 1,4-bis(ethylamino)-9,10-anthracene dione, 4-hydroxy-3-(2-hydroxynaphthalene azo) sodium benzenesulfonate, and 1,4-di-p-toluidine anthraquinone in the fused ring organic compound series of anthracene compounds having carbonyl groups at C9 and C10 in a weight ratio of 1.8:5.5:2.3.

[0242] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0243] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.96 (in the near-infrared wavelength range: 780-1200 nm).

[0244] Example 13

[0245] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0246] Thermoplastic resin 100 parts

[0247] Light-transmissive black organic mixture 0.20 parts;

[0248] The thermoplastic resin is polymethyl methacrylate resin;

[0249] The light-transmissive black organic mixture is a mixture of 4-hydroxy-3-(2-hydroxynaphthalene azo) sodium benzenesulfonate, 1,4-di-p-toluidine anthraquinone, and 6,15-dihydrodianthrylpyridazine-5,9,14,18-tetraone in the condensed ring organic compound series of anthracene compounds with carbonyl at C9, C10, in a weight ratio of 2.3:6.0:2.5.

[0250] The raw materials are mixed by a high-speed blender, extrusion injection molded, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0251] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.89 (in the near-infrared wavelength range: 780-1200 nm).

[0252] Example 14

[0253] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0254] Thermoplastic resin 100 parts

[0255] Light-transmissive black organic mixture 0.25 parts;

[0256] The thermoplastic resin is polymethyl methacrylate resin;

[0257] The light-transmissive black organic mixture is a mixture of 1,4-di-p-toluidine anthraquinone, 6,15-dihydrodianthrylpyridazine-5,9,14,18-tetraone, and tetracarboxylic acid-bis(3,5-dimethylphenyl) imide in the condensed ring organic compound series of anthracene compounds with carbonyl at C9, C10, in a weight ratio of 2.6:6.5:2.7.

[0258] The raw materials are mixed by a high-speed blender, extrusion injection molded, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0259] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.87 (in the near-infrared wavelength range: 780-1200 nm).

[0260] Example 15

[0261] A plastic product with high transmittance at near-infrared light wavelength, which is composed of raw materials in the following weight parts:

[0262] Thermoplastic resin 100 parts

[0263] Light-transmitting black organic mixture 0.30 parts;

[0264] The thermoplastic resin is polymethyl methacrylate resin;

[0265] The light-transmitting black organic mixture is a mixture composed of 6,15-dihydrodianthrylidene pyridazine-5,9,14,18-tetraone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, and 4,4'-diamino-[1,1'-binaphthalene]-9,9',10,10'-tetraone in an anthracene series of fused ring organic compounds having carbonyl groups at C9 and C10 in a weight ratio of 3:7:3.

[0266] The raw materials are mixed by a high-speed blender, extruded and injection molded to obtain a black plastic product with high transmittance in the near-infrared light wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0267] The ratio of the transmittance of the plastic PMMA containing the light-transmitting black organic mixture to the transmittance of pure plastic PMMA is 0.85 (at near-infrared wavelength: 1064 nm).

[0268] Example 16

[0269] A plastic product with high transmittance at near-infrared light wavelength, which is composed of raw materials in the following weight parts:

[0270] Thermoplastic resin 100 parts

[0271] Light-transmitting black organic mixture 0.10 parts;

[0272] The thermoplastic resin is polymethyl methacrylate resin;

[0273] The light-transmissive black organic mixture is composed of 4,4'-diamino-[l,l'-binaphthyl]-9,9',10,10'-tetrone, 1,5-bis[(3-methylphenyl)amino]-9,10-anthraquinone, 2-(3-hydroxy-2-quinolinyl)indane-l,3-dione, 4-cyclohexylamino-N-methyl-l(N),9-anthrapyridone in the series of condensed ring organic compounds with carbonyl group at C9, C10 position of anthracene series, in a weight ratio of 1.5:1:2:4.

[0274] The raw materials are mixed by high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range, and the obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0275] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.93 (in the near-infrared wavelength range: 780-1200 nm).

[0276] Example 17

[0277] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0278] Thermoplastic resin 100 parts

[0279] Light-transmissive black organic mixture 0.15 parts;

[0280] The thermoplastic resin is polymethyl methacrylate resin;

[0281] The light-transmissive black organic mixture is composed of 4,4'-diamino-[l,l'-binaphthyl]-9,9',10,10'-tetrone, 1,5-bis[(3-methylphenyl)amino]-9,10-anthraquinone, 2-(3-hydroxy-2-quinolinyl)indane-l,3-dione, 4-cyclohexylamino-N-methyl-l(N),9-anthrapyridone in the series of condensed ring organic compounds with carbonyl group at C9, C10 position of anthracene series, in a weight ratio of 1.5:1:2:4.

[0282] The raw materials are mixed by high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range, and the obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0283] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.88 (in the near-infrared wavelength range: 780-1200 nm).

[0284] Example 18

[0285] A plastic product with high light transmittance in the near-infrared light wavelength range, which is composed of the following raw materials in parts by weight:

[0286] Thermoplastic resin 100 parts

[0287] Light-transmissive black organic mixture 0.20 parts;

[0288] The thermoplastic resin is a polymethyl methacrylate resin;

[0289] The light-transmissive black organic mixture is 1,4-bis(ethylamino)-9,10-anthracenedione, 4,4'-diamino-[1,1'-binaphthalene]-9,9',10,10'-tetrone, 2,4-dihydro-5-methyl-2-phenyl-4-phenylazo-3H-pyrazol-3-one of the pyrenone series, and 4-p-toluidino-N-methyl-1(N),9-anthrapyridone of the anthrapyridone series in the condensed ring organic compound series of anthracene compounds with carbonyl groups at C9, C10, and the weight ratio is 2.3:2:3:4.8.

[0290] The raw materials are mixed by a high-speed blender, extrusion injection molded, and a black plastic product with high light transmittance in the near-infrared light wavelength range is obtained. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0291] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.86 (in the near-infrared wavelength range: 780-1200 nm).

[0292] Example 19

[0293] A plastic product with high light transmittance in the near-infrared light wavelength range, which is composed of the following raw materials in parts by weight:

[0294] Thermoplastic resin 100 parts

[0295] Light-transmissive black organic mixture 0.25 parts;

[0296] The thermoplastic resin is a polymethyl methacrylate resin;

[0297] The light-transmissive black organic mixture is composed of 6,15-dihydrodianthradiazine-5,9,14,18-tetrone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, 4-[(1,5-dihydro-3-methyl-5-oxo-1-phenyl-4H-pyrazole-4-methylene)]-2,4-diketone, 6-bromo-4-methyl-1-phenylanthrapyridone in the series of condensed ring organic compounds of anthracene compounds with carbonyl at C9, C10 position, in a weight ratio of 3:3:4:5.5.

[0298] The raw materials are mixed by a high-speed blender, and extrusion injection molding is performed to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0299] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.80 (in the near-infrared wavelength range: 780-1200 nm).

[0300] Example 20

[0301] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0302] Thermoplastic resin 100 parts

[0303] Light-transmissive black organic mixture 0.30 parts;

[0304] The thermoplastic resin is a polymethyl methacrylate resin;

[0305] The light-transmissive black organic mixture is composed of 6,15-dihydrodianthradiazine-5,9,14,18-tetrone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, 4-[(1,5-dihydro-3-methyl-5-oxo-1-phenyl-4H-pyrazole-4-methylene)]-2,4-diketone, 6-bromo-4-methyl-1-phenylanthrapyridone in the series of condensed ring organic compounds of anthracene compounds with carbonyl at C9, C10 position, in a weight ratio of 3:3:4:5.5.

[0306] The raw materials are mixed by a high-speed blender, and extrusion injection molding is performed to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0307] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.77 (in the near-infrared wavelength range: 780-1200 nm).

[0308] Comparative Example 11

[0309] A plastic product with high light transmittance in the near-infrared light wavelength range, which is composed of the following raw materials in parts by weight:

[0310] Thermoplastic resin 100 parts

[0311] Light-transmissive black organic mixture 0.10 parts;

[0312] The thermoplastic resin is a polymethyl methacrylate resin;

[0313] The light-transmissive black organic mixture is a mixture composed of 1-methylaminoanthracene acid, 1,4-bis(ethylamino)-9,10-anthracene dione, and 4-hydroxy-3-(2-hydroxynaphthalene azo) benzene sulfonic acid sodium in the series of condensed ring organic compounds of anthracene compounds with carbonyl groups at C9 and C10 in a weight ratio of 0.5:4:1.

[0314] The raw materials are mixed by a high-speed mixer, extruded and injection molded to obtain a black plastic product with high light transmittance in the near-infrared light wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0315] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.89 (in the near-infrared wavelength range: 780-1200 nm).

[0316] Comparative Example 12

[0317] A plastic product with high light transmittance in the near-infrared light wavelength range, which is composed of the following raw materials in parts by weight:

[0318] Thermoplastic resin 100 parts

[0319] Light-transmissive black organic mixture 0.15 parts;

[0320] The thermoplastic resin is a polymethyl methacrylate resin;

[0321] The light-transmissive black organic mixture is a mixture composed of 1,4-bis(ethylamino)-9,10-anthracene dione, 4-hydroxy-3-(2-hydroxynaphthalene azo) benzene sulfonic acid sodium, and 1,4-di-p-toluidine anthraquinone in the series of condensed ring organic compounds of anthracene compounds with carbonyl groups at C9 and C10 in a weight ratio of 1:4.5:1.5.

[0322] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0323] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.84 (in the near-infrared wavelength range: 780-1200 nm).

[0324] Comparative Example 13

[0325] A plastic product with high light transmittance in the near-infrared wavelength range, which consists of the following raw materials by weight:

[0326] Thermoplastic resin 100 parts

[0327] Light-transmissive black organic mixture 0.20 parts;

[0328] The thermoplastic resin is a polymethyl methacrylate resin;

[0329] The light-transmissive black organic mixture is a mixture of sodium 4-hydroxy-3-(2-hydroxynaphthalene azo) benzene sulfonate, 1,4-di-p-toluidine anthraquinone, and 6,15-dihydrodi-anthracenediazine-5,9,14,18-tetraone in an anthracene series of fused ring organic compounds with carbonyl groups at C9 and C10, with a weight ratio of 3.5:7.5:3.5.

[0330] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0331] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.81 (in the near-infrared wavelength range: 780-1200 nm).

[0332] Comparative Example 14

[0333] A plastic product with high light transmittance in the near-infrared wavelength range, which consists of the following raw materials by weight:

[0334] Thermoplastic resin 100 parts

[0335] Light-transmissive black organic mixture 0.25 parts;

[0336] The thermoplastic resin is a polymethyl methacrylate resin;

[0337] The light-transmissive black organic mixture is a mixture of 1,4-di-p-tolylaminoanthraquinone, 6,15-dihydrodianthrylpyridazinedione-5,9,14,18-tetraone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide in the series of fused ring organic compounds of anthracene compounds having carbonyl groups at C9, C10 in a weight ratio of 4:8:4.

[0338] The raw materials are mixed by a high-speed blender, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0339] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.68 (in the near-infrared wavelength range: 780-1200 nm).

[0340] Comparative Example 15

[0341] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0342] Thermoplastic resin 100 parts

[0343] Light-transmissive black organic mixture 0.30 parts;

[0344] The thermoplastic resin is a polymethyl methacrylate resin;

[0345] The light-transmissive black organic mixture is a mixture of 6,15-dihydrodianthrylpyridazinedione-5,9,14,18-tetraone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, 4,4'-diamino-[1,1'-binaphthalene]-9,9',10,10'-tetraone in the series of fused ring organic compounds of anthracene compounds having carbonyl groups at C9, C10 in a weight ratio of 4.5:8.5:4.5.

[0346] The raw materials are mixed by a high-speed blender, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0347] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.60 (in the near-infrared wavelength range: 780-1200 nm).

[0348] Comparative Example 16

[0349] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0350] thermoplastic resin 100 parts

[0351] light-transmissive black organic mixture 0.1 part;

[0352] The thermoplastic resin is polymethyl methacrylate resin;

[0353] The light-transmissive black organic mixture is 4,4'-diamino-[l,l'-binaphthyl]-9,9',10,10'-tetrone, 1,5-bis[(3-methylphenyl)amino]-9,10-anthraquinone, 2-(3-hydroxy-2-quinolinyl)indane-l,3-dione, 4-cyclohexylamino-N-methyl-l(N),9-anthrapyridone in the series of condensed ring organic compounds of anthracene compounds having carbonyl groups at C9, C10, which constitute 0.5:0.3:1.0:3 in weight ratio.

[0354] The raw materials are mixed by a high-speed mixer, extrusion injection molded, and a black plastic product having high light transmittance in the near-infrared wavelength range is obtained. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0355] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.93 (in the near-infrared wavelength range: 780-1200 nm).

[0356] Comparative Example 17

[0357] A plastic product having high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0358] thermoplastic resin 100 parts

[0359] light-transmissive black organic mixture 0.15 parts;

[0360] The thermoplastic resin is polymethyl methacrylate resin;

[0361] The light-transmissive black organic mixture is 1-methylaminoanthracene acid, 1,5-bis[(3-methylphenyl)amino]-9,10-anthraquinone, 2-(3-hydroxy-2-quinolinyl)indane-l,3-dione, 4-cyclohexylamino-N-methyl-l(N),9-anthrapyridone in the series of condensed ring organic compounds of anthracene compounds having carbonyl groups at C9, C10, which constitute 1:0.5:1.5:3.5 in weight ratio.

[0362] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range, the obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0363] The ratio of the transmittance of the PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.87 (in the near-infrared wavelength range: 780-1200 nm).

[0364] Comparative Example 18

[0365] A plastic product with high light transmittance in the near-infrared wavelength range, which consists of the following raw materials in parts by weight:

[0366] Thermoplastic resin 100 parts

[0367] Light-transmissive black organic mixture 0.20 parts;

[0368] The thermoplastic resin is a polymethyl methacrylate resin;

[0369] The light-transmissive black organic mixture is 1,4-bis(ethylamino)-9,10-anthracenedione, 4,4'-diamino-[1,1'-binaphthalene]-9,9',10,10'-tetrone, 2,4-dihydro-5-methyl-2-phenyl-4-phenylazo-3H-pyrazol-3-one of the pyrenone series, and 4-p-toluidino-N-methyl-1(N),9-anthrapyridone of the anthrapyridone series in the fused ring organic compound series of anthracene compounds with carbonyl groups at C9, C10, and the weight ratio is 3.5:3.3:4.5:6.0.

[0370] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range, the obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0371] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.76 (in the near-infrared wavelength range: 780-1200 nm).

[0372] Comparative Example 19

[0373] A plastic product with high light transmittance in the near-infrared wavelength range, which consists of the following raw materials in parts by weight:

[0374] Thermoplastic resin 100 parts

[0375] Light-transmissive black organic mixture 0.25 parts;

[0376] The thermoplastic resin is a polymethyl methacrylate resin;

[0377] The light-transmissive black organic mixture is composed of 6,15-dihydrodianthradiazine-5,9,14,18-tetrone, bis(3,5-dimethylphenyl) imide, 4-[(1,5-dihydro-3-methyl-5-oxo-1-phenyl-4H-pyrazole-4-methylene)]-2,4-diketone, 6-bromo-4-methyl-1-phenylanthrapyridone in the series of condensed ring organic compounds of anthracene compounds with carbonyl at C9, C10 position, and sodium 4-hydroxy-3-(2-hydroxynaphthalene azo) benzene sulfonate, in a weight ratio of 4.5:4.1:5.5:7.0.

[0378] The raw materials are mixed by a high-speed blender, and extrusion injection molding is performed to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0379] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.68 (in the near-infrared wavelength range: 780-1200 nm).

[0380] Comparative Example 20

[0381] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0382] Thermoplastic resin 100 parts

[0383] Light-transmissive black organic mixture 0.30 parts;

[0384] The thermoplastic resin is a polymethyl methacrylate resin;

[0385] The light-transmissive black organic mixture is composed of 6,15-dihydrodianthradiazine-5,9,14,18-tetrone, bis(3,5-dimethylphenyl) imide, 4-[(1,5-dihydro-3-methyl-5-oxo-1-phenyl-4H-pyrazole-4-methylene)]-2,4-diketone, 6-bromo-4-methyl-1-phenylanthrapyridone in the series of condensed ring organic compounds of anthracene compounds with carbonyl at C9, C10 position, and sodium 4-hydroxy-3-(2-hydroxynaphthalene azo) benzene sulfonate, in a weight ratio of 4.5:4.1:5.5:7.0.

[0386] The raw materials are mixed by a high-speed blender, and extrusion injection molding is performed to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0387] The ratio of the transmittance of the plastic PMMA containing the light-transmissive black organic mixture to the transmittance of pure plastic PMMA is 0.62 (in the near-infrared wavelength range: 780-1200 nm).

[0388] The light transmittance of the light-transmissive black plastic PMMA prepared in Examples 11-20 and Comparative Examples 11-20 is shown in Table 2.

[0389] Table 2. Light transmittance of the light-transmissive black plastic PMMA prepared in Examples 11-20 and Comparative Examples 11-20

[0390]

[0391]

[0392] As can be seen from Table 2, the light-transmissive black plastic PMMA of the present application has very low light transmittance in the visible light range (380-750 nm), but has very excellent light transmittance in the near-infrared wavelength range (780-1200 nm), while in some comparative examples deviating from the proportions of the present application, some plastic products also have the above-mentioned situation, but according to the principle of colorimetry, the plastic products prepared by these formulations do not reach black, and the colorimetric diagram of the light-transmissive black plastic products prepared in Examples 11-20 and Comparative Examples 11-20 is shown in Figure 2 As can be seen from Table 2, the light-transmissive black plastic PMMA of the present application has very low light transmittance in the visible light range (380-750 nm), but has very excellent light transmittance in the near-infrared wavelength range (780-1200 nm), while in some comparative examples deviating from the proportions of the present application, some plastic products also have the above-mentioned situation, but according to the principle of colorimetry, the plastic products prepared by these formulations do not reach black, and the colorimetric diagram of the light-transmissive black plastic products prepared in Examples 11-20 and Comparative Examples 11-20 is shown in Figure 2 As can be seen from Table 2, the light-transmissive black plastic PMMA of the present application has very low light transmittance in the visible light range (380-750 nm), but has very excellent light transmittance in the near-infrared wavelength range (780-1200 nm), while in some comparative examples deviating from the proportions of the present application, some plastic products also have the above-mentioned situation, but according to the principle of colorimetry, the plastic products prepared by these formulations do not reach black, and the colorimetric diagram of the light-transmissive black plastic products prepared in Examples 11-20 and Comparative Examples 11-20 is shown in

[0393] The above examples are better implementation schemes of the present application, in addition to this, the present application can also be implemented in other ways, and any substitutions made without departing from the concept of the present application are within the protection scope of the present application.

[0394] Example 21

[0395] A plastic product having high light transmittance in the near-infrared light wavelength range, which composition comprises the following raw materials in parts by weight:

[0396] Thermoplastic resin 100 parts

[0397] Light-transmissive black organic mixture 0.10 parts;

[0398] The thermoplastic resin is nylon 6 resin;

[0399] The light-transmissive black organic mixture is a mixture of 1-methylamino anthracene acid, 1,4-bis(ethylamino)-9,10-anthracene dione, and 4-hydroxy-3-(2-hydroxynaphthalene azo) sodium benzenesulfonate in the series of condensed ring organic compounds of anthracene compounds with carbonyl at C9 and C10 in a weight ratio of 1.5:5:2.

[0400] The raw materials are mixed by a high-speed blender, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0401] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of pure plastic PA6 is 0.95 (in the near-infrared wavelength range: 780-1200 nm).

[0402] Example 22

[0403] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of the following raw materials in weight parts:

[0404] Thermoplastic resin 100 parts

[0405] Light-transmissive black organic mixture 0.15 parts;

[0406] The thermoplastic resin is a nylon 6 resin;

[0407] The light-transmissive black organic mixture is a mixture of 1,4-bis(ethylamino)-9,10-anthracene dione, 4-hydroxy-3-(2-hydroxynaphthalene azo) sodium benzenesulfonate, and 1,4-di-p-toluidine anthraquinone in the series of condensed ring organic compounds of anthracene compounds with carbonyl at C9 and C10 in a weight ratio of 1.8:5.5:2.3.

[0408] The raw materials are mixed by a high-speed blender, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0409] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of pure plastic PA6 is 0.93 (in the near-infrared wavelength range: 780-1200 nm).

[0410] Example 23

[0411] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of the following raw materials in weight parts:

[0412] Thermoplastic resin 100 parts

[0413] Light-transmissive black organic mixture 0.20 parts;

[0414] The thermoplastic resin is a nylon 6 resin;

[0415] The light-transmissive black organic mixture is a mixture of 4-hydroxy-3-(2-hydroxynaphthaleneazo) sodium benzenesulfonate, 1,4-di-p-toluidino anthraquinone, and 6,15-dihydrodianthrylpyridazine-5,9,14,18-tetraone in a weight ratio of 2.3:6.0:2.5 from the series of condensed ring organic compounds of anthracene compounds having carbonyl groups at C9 and C10.

[0416] The raw materials are mixed by a high-speed blender, extrusion injection molded, and a black plastic product having high light transmittance in the near-infrared wavelength range is obtained. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0417] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of pure plastic PA6 is 0.90 (in the near-infrared wavelength range: 780-1200 nm).

[0418] Example 24

[0419] A plastic product having high light transmittance in the near-infrared wavelength range, which is composed of raw materials in the following weight parts:

[0420] Thermoplastic resin 100 parts

[0421] Light-transmissive black organic mixture 0.25 parts;

[0422] The thermoplastic resin is a nylon 6 resin;

[0423] The light-transmissive black organic mixture is a mixture of 4-hydroxy-3-(2-hydroxynaphthaleneazo) sodium benzenesulfonate, 1,4-di-p-toluidino anthraquinone, and 6,15-dihydrodianthrylpyridazine-5,9,14,18-tetraone in a weight ratio of 2.3:6.0:2.5 from the series of condensed ring organic compounds of anthracene compounds having carbonyl groups at C9 and C10.

[0424] The raw materials are mixed by a high-speed blender, extrusion injection molded, and a black plastic product having high light transmittance in the near-infrared wavelength range is obtained. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0425] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of pure plastic PA6 is 0.90 (in the near-infrared wavelength range: 780-1200 nm).

[0426] Example 25

[0427] A plastic product with high light transmittance at near-infrared light wavelength, which is composed of raw materials in the following weight parts:

[0428] Thermoplastic resin 100 parts

[0429] Light-transmitting black organic mixture 0.30 parts;

[0430] The thermoplastic resin is nylon 6 resin;

[0431] The light-transmitting black organic mixture is a mixture composed of 6,15-dihydrodianthrylpyridazin-5,9,14,18-tetraone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, and 4,4'-diamino-[1,1'-binaphthalene]-9,9',10,10'-tetraone in the anthracene series of fused ring organic compounds with carbonyl groups at C9 and C10, in a weight ratio of 3:7:3.

[0432] The raw materials are mixed by a high-speed mixer, extruded and injection molded to obtain a black plastic product with high light transmittance in the near-infrared light wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0433] The ratio of the transmittance of the plastic PA6 containing the light-transmitting black organic mixture to the transmittance of pure plastic PA6 is 0.85 (in the near-infrared wavelength range: 780-1200 nm).

[0434] Example 26

[0435] A plastic product with high light transmittance at near-infrared light wavelength, which is composed of raw materials in the following weight parts:

[0436] Thermoplastic resin 100 parts

[0437] Light-transmitting black organic mixture 0.10 parts;

[0438] The thermoplastic resin is nylon 6 resin;

[0439] The light-transmitting black organic mixture is composed of 4,4'-diamino-[1,1'-binaphthalene]-9,9',10,10'-tetraone, 1,5-bis[(3-methylphenyl)amino]-9,10-anthraquinone, and 3-methyl-6-(cyclohexylamino)-3H-dibenzo[F,IJ]isoquinoline-2,7-dione in the anthracene series of fused ring organic compounds with carbonyl groups at C9 and C10, in a weight ratio of 1.5:1:2:4.

[0440] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range, the obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0441] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of the pure plastic PA6 is 0.91 (in the near-infrared wavelength range: 780-1200 nm).

[0442] Example 27

[0443] A plastic product with high light transmittance in the near-infrared wavelength range, which consists of the following raw materials in parts by weight:

[0444] Thermoplastic resin 100 parts

[0445] Light-transmissive black organic mixture 0.15 parts;

[0446] The thermoplastic resin is a nylon 6 resin;

[0447] The light-transmissive black organic mixture is 1-methylaminoanthracene acid, 1,5-bis[(3-methylphenyl)amino]-9,10-anthraquinone, 2-(3-hydroxy-2-quinolinyl)indane-1,3-dione of the pyrenone series, and 4-cyclohexylamino-N-methyl-1(N),9-anthrapyridone of the anthrapyridone series, which are condensed ring organic compounds in the anthracene series with carbonyl groups at C9, C10, and the weight ratio is 1.8:1.5:2.5:4.4.

[0448] The raw materials are mixed by a high-speed mixer, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range, the obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0449] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of the pure plastic PA6 is 0.88 (in the near-infrared wavelength range: 780-1200 nm).

[0450] Example 28

[0451] A plastic product with high light transmittance in the near-infrared wavelength range, which consists of the following raw materials in parts by weight:

[0452] Thermoplastic resin 100 parts

[0453] Light-transmissive black organic mixture 0.20 parts;

[0454] The thermoplastic resin is a nylon 6 resin;

[0455] The light-transmissive black organic mixture is composed of 4-hydroxy-3-(2-hydroxynaphthalene azo) sodium phenyl sulfonate, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, 8,9,10,11-tetrachloro-12H-isoindolo[2,1-A]pyridin-12-one, 6-bromo-4-methyl-1-phenyl anthrapyridone, which are organic compounds in the anthracene series of fused ring organic compounds having carbonyl groups at C9, C10 positions, in a weight ratio of 2.6:2.5:3.5:5.1.

[0456] The raw materials are mixed by a high-speed blender, and extrusion injection molding is performed to obtain a black plastic product having high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0457] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of pure plastic PA6 is 0.88 (in the near-infrared wavelength range: 780-1200 nm).

[0458] Example 29

[0459] A plastic product having high light transmittance in the near-infrared wavelength range is composed of the following raw materials in parts by weight:

[0460] Thermoplastic resin 100 parts

[0461] Light-transmissive black organic mixture 0.25 parts;

[0462] The thermoplastic resin is a nylon 6 resin;

[0463] The light-transmissive black organic mixture is composed of 4-hydroxy-3-(2-hydroxynaphthalene azo) sodium phenyl sulfonate, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, 8,9,10,11-tetrachloro-12H-isoindolo[2,1-A]pyridin-12-one, 6-bromo-4-methyl-1-phenyl anthrapyridone, which are organic compounds in the anthracene series of fused ring organic compounds having carbonyl groups at C9, C10 positions, in a weight ratio of 2.6:2.5:3.5:5.1.

[0464] The raw materials are mixed by a high-speed blender, and extrusion injection molding is performed to obtain a black plastic product having high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0465] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of pure plastic PA6 is 0.83 (in the near-infrared wavelength range: 780-1200 nm).

[0466] Example 30

[0467] A plastic product with high transmittance in near infrared wavelength range, which is composed of raw materials in the following weight parts:

[0468] Thermoplastic resin 100 parts

[0469] Light-transmitting black organic mixture 0.30 parts;

[0470] The thermoplastic resin is nylon 6 resin;

[0471] The light-transmitting black organic mixture is composed of 6,15-dihydrodianthrylpyridazin-5,9,14,18-tetraone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, 4-[(1,5-dihydro-3-methyl-5-oxo-1-phenyl-4H-pyrazole-4-methylene)]-2,4-dione, 6-bromo-4-methyl-1-phenylanthrapyridone in the series of condensed ring organic compounds of anthracene compounds with carbonyl groups at C9, C10 positions, in a weight ratio of 3:3:4:5.5.

[0472] The raw materials are mixed by a high-speed mixer, extrusion injection molded to obtain a black plastic product with high transmittance in the near infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0473] The ratio of the transmittance of the plastic PA6 containing the light-transmitting black organic mixture to the transmittance of pure plastic PA6 is 0.79 (in the near infrared wavelength range: 780-1200 nm).

[0474] Comparative Example 21

[0475] A plastic product with high transmittance in near infrared wavelength range, which is composed of raw materials in the following weight parts:

[0476] Thermoplastic resin 100 parts

[0477] Light-transmitting black organic mixture 0.10 parts;

[0478] The thermoplastic resin is nylon 6 resin;

[0479] The light-transmitting black organic mixture is a mixture composed of 1-methylaminoanthracene acid, 1,4-bis(ethylamino)-9,10-anthracenedione, and 4-hydroxy-3-(2-hydroxynaphthalene azo) sodium benzenesulfonate in the series of condensed ring organic compounds of anthracene compounds with carbonyl groups at C9, C10 positions, in a weight ratio of 0.5:4:1.

[0480] The raw materials are mixed by a high-speed blender, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0481] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of pure plastic PA6 is 0.88 (in the near-infrared wavelength range: 780-1200 nm).

[0482] Comparative Example 22

[0483] A plastic product with high light transmittance in the near-infrared wavelength range, which consists of the following raw materials in parts by weight:

[0484] Thermoplastic resin 100 parts

[0485] Light-transmissive black organic mixture 0.15 parts;

[0486] The thermoplastic resin is a nylon 6 resin;

[0487] The light-transmissive black organic mixture is a mixture consisting of 1,4-bis(ethylamino)-9,10-anthracenedione, 4-hydroxy-3-(2-hydroxynaphthalene azo) sodium benzenesulfonate, and 1,4-di-p-tolylamino anthraquinone in the condensed ring organic compound series of anthracene compounds with carbonyl groups at C9 and C10, in a weight ratio of 1:4.5:1.5.

[0488] The raw materials are mixed by a high-speed blender, extrusion injection molding, to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0489] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of pure plastic PA6 is 0.88 (in the near-infrared wavelength range: 780-1200 nm).

[0490] Comparative Example 23

[0491] A plastic product with high light transmittance in the near-infrared wavelength range, which consists of the following raw materials in parts by weight:

[0492] Thermoplastic resin 100 parts

[0493] Light-transmissive black organic mixture 0.20 parts;

[0494] The thermoplastic resin is a nylon 6 resin;

[0495] The light-transmissive black organic mixture is a mixture of 4-hydroxy-3-(2-hydroxynaphthalene azo) sodium benzenesulfonate, 1,4-di-p-toluidine anthraquinone, and 6,15-dihydrodianthrylpyridazine-5,9,14,18-tetraone in the fused ring organic compound series of anthracene compounds with carbonyl at C9, C10 in a weight ratio of 3.5:7.5:3.5.

[0496] The raw materials are mixed by a high-speed blender, and extrusion injection molding is performed to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0497] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of pure plastic PA6 is 0.79 (in the near-infrared wavelength range: 780-1200 nm).

[0498] Comparative Example 24

[0499] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of the following raw materials in parts by weight:

[0500] Thermoplastic resin 100 parts

[0501] Light-transmissive black organic mixture 0.25 parts;

[0502] The thermoplastic resin is a nylon 6 resin;

[0503] The light-transmissive black organic mixture is a mixture of 1,4-di-p-toluidine anthraquinone, 6,15-dihydrodianthrylpyridazine-5,9,14,18-tetraone, and tetracarboxylic acid-bis(3,5-dimethylphenyl) imide in the fused ring organic compound series of anthracene compounds with carbonyl at C9, C10 in a weight ratio of 4:8:4.

[0504] The raw materials are mixed by a high-speed blender, and extrusion injection molding is performed to obtain a black plastic product with high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0505] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of pure plastic PA6 is 0.75 (in the near-infrared wavelength range: 780-1200 nm).

[0506] Comparative Example 25

[0507] A plastic product with high light transmittance in the near-infrared wavelength range, which is composed of the following raw materials in parts by weight:

[0508] Thermoplastic resin 100 parts

[0509] Light-transmissive black organic mixture 0.30 parts;

[0510] The thermoplastic resin is a nylon 6 resin;

[0511] The light-transmissive black organic mixture is a mixture of 6,15-dihydrodianthrylpyridazin-5,9,14,18-tetraone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, and 4,4'-diamino-[1,1'-binaphthyl]-9,9',10,10'-tetraone in the fused ring organic compound series of anthracene compounds having carbonyl groups at C9 and C10 in a weight ratio of 4.5:8.5:4.5.

[0512] The raw materials are mixed by a high-speed blender, and extrusion injection molding is performed to obtain a black plastic product having high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0513] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of pure plastic PA6 is 0.78 (in the near-infrared wavelength range: 780-1200 nm).

[0514] Comparative Example 26

[0515] A plastic product having high light transmittance in the near-infrared wavelength range, which is composed of the following raw materials in parts by weight:

[0516] Thermoplastic resin 100 parts

[0517] Light-transmissive black organic mixture 0.1 parts;

[0518] The thermoplastic resin is a nylon 6 resin;

[0519] The light-transmissive black organic mixture is composed of 4,4'-diamino-[1,1'-binaphthyl]-9,9',10,10'-tetraone, 1,5-bis[(3-methylphenyl)amino]-9,10-anthraquinone, and 3-methyl-6-(cyclohexylamino)-3H-dibenzo[F,IJ]isoquinoline-2,7-dione in the fused ring organic compound series of anthracene compounds having carbonyl groups at C9 and C10 in a weight ratio of 0.5:0.3:1.0:3.

[0520] The raw materials are mixed by a high-speed blender, and extrusion injection molding is performed to obtain a black plastic product having high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0521] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of the pure plastic PA6 is 0.92 (in the near-infrared wavelength range: 780-1200 nm).

[0522] Comparative Example 27

[0523] A plastic product with high light transmittance in the near-infrared light wavelength range, which is composed of the following raw materials in parts by weight:

[0524] Thermoplastic resin 100 parts

[0525] Light-transmissive black organic mixture 0.15 parts;

[0526] The thermoplastic resin is a nylon 6 resin;

[0527] The light-transmissive black organic mixture is 1-methylaminoanthracene acid, 1,5-bis[(3-methylphenyl)amino]-9,10-anthraquinone, 2-(3-hydroxy-2-quinolinyl)indane-1,3-dione of the pyrenone series, and 4-cyclohexylamino-N-methyl-1(N),9-anthrapyridone of the anthrapyridone series, which are condensed ring organic compounds in the anthracene series with carbonyl groups at C9 and C10, and the weight ratio is 1:0.5:1.5:3.5.

[0528] The raw materials are mixed by a high-speed blender, extrusion injection molded, and a black plastic product with high light transmittance in the near-infrared light wavelength range is obtained. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0529] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of the pure plastic PA6 is 0.84 (in the near-infrared wavelength range: 780-1200 nm).

[0530] Comparative Example 28

[0531] A plastic product with high light transmittance in the near-infrared light wavelength range, which is composed of the following raw materials in parts by weight:

[0532] Thermoplastic resin 100 parts

[0533] Light-transmissive black organic mixture 0.20 parts;

[0534] The thermoplastic resin is a nylon 6 resin;

[0535] The light-transmissive black organic mixture is composed of 1,4-bis(ethylamino)-9,10-anthracenedione, 4,4'-diamino-[1,1'-binaphthyl]-9,9',10,10'-tetrone, 2,4-dihydro-5-methyl-2-phenyl-4-phenylazo-3H-pyrazol-3-one of the pyrenone series, 4-p-toluidino-N-methyl-1(N),9-anthrapyridone of the anthrapyridone series, among the fused ring organic compounds of the anthracene series having carbonyl groups at C9, C10, in a weight ratio of 3.5:3.3:4.5:6.0.

[0536] The raw materials are mixed by a high-speed mixer, and extrusion injection molding is performed to obtain a black plastic product having high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0537] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of pure plastic PA6 is 0.83 (in the near-infrared wavelength range: 780-1200 nm).

[0538] Comparative Example 29

[0539] A plastic product having high light transmittance in the near-infrared wavelength range is composed of the following raw materials in parts by weight:

[0540] Thermoplastic resin 100 parts

[0541] Light-transmissive black organic mixture 0.25 parts;

[0542] The thermoplastic resin is a nylon 6 resin;

[0543] The light-transmissive black organic mixture is composed of 4-hydroxy-3-(2-hydroxynaphthalene azo) sodium benzenesulfonate, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, 8,9,10,11-tetrachloro-12H-isoindolo[2,1-A]pyridin-12-one of the organic compounds of the pyrenone series, 6-bromo-4-methyl-1-phenylanthrapyridone of the organic compounds of the anthrapyridone series, among the fused ring organic compounds of the anthracene series having carbonyl groups at C9, C10, in a weight ratio of 4.0:3.8:5.0:6.5.

[0544] The raw materials are mixed by a high-speed mixer, and extrusion injection molding is performed to obtain a black plastic product having high light transmittance in the near-infrared wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0545] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of pure plastic PA6 is 0.76 (in the near-infrared wavelength range: 780-1200 nm).

[0546] Comparative Example 30

[0547] A plastic product having high light transmittance at near infrared light wavelength, which is composed of raw materials in the following weight parts:

[0548] thermoplastic resin 100 parts

[0549] light-transmissive black organic mixture 0.30 parts;

[0550] The thermoplastic resin is nylon 6 resin;

[0551] The light-transmissive black organic mixture is composed of 6,15-dihydrodi-anthrylidynpyridazine-5,9,14,18-tetrone, tetracarboxylic acid-bis(3,5-dimethylphenyl) imide, 4-[(1,5-dihydro-3-methyl-5-oxo-1-phenyl-4H-pyrazole-4-ylmethyl)]-2,4-dione, 6-bromo-4-methyl-1-phenylanthrapyridinone, which are anthracene series compounds having carbonyl groups at C9, C10, pyron series organic compounds, in a weight ratio of 4.5:4.1:5.5:7.0.

[0552] The raw materials are mixed by a high-speed mixer, extrusion injection molded, to obtain a black plastic product having high light transmittance in the near infrared light wavelength range. The obtained plastic product is 7 mm long, 2.5 mm wide, and 2.2 mm thick.

[0553] The ratio of the transmittance of the plastic PA6 containing the light-transmissive black organic mixture to the transmittance of pure plastic PA6 is 0.72 (in the near infrared wavelength range: 780-1200 nm).

[0554] The light transmittance of the light-transmissive black plastic PA6 obtained in Examples 21-30 and Comparative Examples 21-30 is shown in Table 3

[0555] Table 3. Light transmittance of the light-transmissive black plastic PA6 obtained in Examples 21-30 and Comparative Examples 21-30

[0556]

[0557]

[0558] As can be seen from Table 3, the light-transmissive black plastic PA6 of the present application has very low light transmittance in the visible light range (380-750 nm), but has very excellent light transmittance in the near-infrared wavelength range (780-1200 nm). In some comparative examples deviating from the present application, some prepared plastic PA6 also has the above-mentioned situation, but according to the principle of colorimetry, the plastic products prepared by these formulations do not reach black. The colorimetric diagram of the light-transmissive black plastic PA6 prepared in Examples 21-30 and Comparative Examples 21-30 is shown in Figure 3 As can be seen from Table 3, the light-transmissive black plastic PA6 of the present application has very low light transmittance in the visible light range (380-750 nm), but has very excellent light transmittance in the near-infrared wavelength range (780-1200 nm). In some comparative examples deviating from the present application, some prepared plastic PA6 also has the above-mentioned situation, but according to the principle of colorimetry, the plastic products prepared by these formulations do not reach black. The colorimetric diagram of the light-transmissive black plastic PA6 prepared in Examples 21-30 and Comparative Examples 21-30 is shown in Figure 3 As can be seen from Table 3, the light-transmissive black plastic PA6 of the present application has very low light transmittance in the visible light range (380-750 nm), but has very excellent light transmittance in the near-infrared wavelength range (780-1200 nm). In some comparative examples deviating from the present application, some prepared plastic PA6 also has the above-mentioned situation, but according to the principle of colorimetry, the plastic products prepared by these formulations do not reach black. The colorimetric diagram of the light-transmissive black plastic PA6 prepared in Examples 21-30 and Comparative Examples 21-30 is shown in

[0559] The above examples are better implementation schemes of the present application, and in addition, the present application can be implemented in other ways, and any substitutions made without departing from the concept of the present application are within the protection scope of the present application.

[0560] In summary, the present application provides an infrared-transmissive resin composition, which can be used to prepare a black plastic product having high light transmittance in the near-infrared range by extrusion injection molding. The black plastic product has very low light transmittance in the visible light range (380-750 nm) and very high light transmittance in the near-infrared range (780-1200 nm). The black plastic product prepared by the present application is suitable for laser transmission welding and solves the problems existing in the laser transmission welding of existing black plastic products. At the same time, the preparation method of the present application is simple in process, easy to operate and control, stable in quality, high in production efficiency, and can be mass-produced in industry, and has good application prospect.

Claims

1. A near-infrared transmitting resin composition, characterized by: The resin composition comprises the following components by weight: Thermoplastic resin 100 parts Light-transmitting black organic mixture 0.1-0.3 parts; The thermoplastic resin is any one of polypropylene resin, polyethylene resin, polyformaldehyde resin, polymethyl methacrylate, polystyrene, polycarbonate, styrene-acrylonitrile copolymer, styrene-methyl methacrylate copolymer, nylon 6 resin and nylon 66 resin; The light-transmitting black organic mixture is composed of three kinds of condensed ring organic compounds of anthracene series with carbonyl at C9 and C10 positions, or composed of two kinds of condensed ring organic compounds of anthracene series with carbonyl at C9 and C10 positions, one kind of organic compound of A series and one kind of organic compound of B series; When the light-transmitting black organic mixture is composed of three kinds of condensed ring organic compounds of anthracene series with carbonyl at C9 and C10 positions, The condensed ring organic compounds of anthracene series with carbonyl at C9 and C10 positions are selected from any three of 1-methylaminoanthracene acid, 1,4-bis(ethylamino)-9,10-anthracene-dione, 1,4-di-p-toluidinoanthraquinone, 6,15-dihydrodianthrapyridazine-5,9,14,18-tetraone, 4,4'-diamino-[1,1'-binaphthalene]-9,9',10,10'-tetraone, 1,5-bis[(3-methylphenyl)amino]-9,10-anthraquinone; The weight ratio of the three kinds of condensed ring organic compounds of anthracene series with carbonyl at C9 and C10 positions is 1.5-3:5-7:2-3; When the light-transmitting black organic mixture is composed of two kinds of condensed ring organic compounds of anthracene series with carbonyl at C9 and C10 positions, one kind of organic compound of A series and one kind of organic compound of B series, The condensed ring organic compounds of anthracene series with carbonyl at C9 and C10 positions are selected from any two of 1-methylaminoanthracene acid, 1,4-bis(ethylamino)-9,10-anthracene-dione, 1,4-di-p-toluidinoanthraquinone, 6,15-dihydrodianthrapyridazine-5,9,14,18-tetraone, 4,4'-diamino-[1,1'-binaphthalene]-9,9',10,10'-tetraone, 1,5-bis[(3-methylphenyl)amino]-9,10-anthraquinone; The organic compound of A series is selected from any one of bisbenzimidazole[2,1-B:2',1'-I]benzo[LMN][3.8]phenanthroline-8,17-dione, 2-(3-hydroxy-2-quinolyl)indane-1,3-dione, 8,9,10,11-tetrachloro-12H-isoindolo[2,1-A]pyridin-12-one, 2,4-dihydro-5-methyl-2-phenyl-4-phenylazo-3H-pyrazolin-3-one; The organic compound of the B series is selected from any one of 3-methyl-6-(cyclohexylamino)-3H-dibenzo[F,IJ]isoquinoline-2,7-dione, 4-cyclohexylamino-N-methyl-1(N),9-anthrapyridone, 4-p-toluidino-N-methyl-1(N),9-anthrapyridone, 6-bromo-4-methyl-1-phenylanthrapyridone; The weight ratio of the two C9, C10-position carbonyl group-containing anthracene series fused ring organic compounds, the organic compound of the A series, and the organic compound of the B series is 1.5-3: 1-3: 2-4: 4-5.

5.

2. Use of the near-infrared transmitting resin composition of claim 1 in the production of a plastic product having high light transmittance at a near-infrared light wavelength.

3. Use according to claim 2, characterized in that: The plastic product is a black plastic product.

4. Use according to claim 2, characterized in that: The near-infrared light wavelength is 780 nm-1200 nm.

5. A plastic article having high light transmittance at near infrared light wavelengths, characterized by: It is produced using the near-infrared transmitting resin composition of claim 1 as a raw material.

6. The plastic article of claim 5, wherein: The plastic product is a black plastic product.

7. The plastic article of claim 5, wherein: The near-infrared light wavelength is 780 nm-1200 nm.

8. Process for the production of plastic articles having high transparency at near infrared wavelengths according to any one of claims 5 to 7, characterized in that: It comprises the following steps: (1) mixing the thermoplastic resin and the light-transmitting black organic compound in the near-infrared transmitting resin composition of claim 1; (2) extruding the mixture using an extruder and pelletizing; (3) injection molding the pelletized product, and the process is completed.

9. Use of the near-infrared transmitting resin composition of claim 1 or the plastic product of any one of claims 5-7 as a material for laser transmission welding.

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