An infrared-transmittable PC material and its preparation method

Abstract

The present invention discloses a near-infrared light-transmitting PC material and a preparation method thereof, belonging to the field of polymer materials. The near-infrared light-transmitting PC material of the present invention uses a specific combination of near-infrared absorbing dyes and colorants as components to achieve the effect that the transmittance of invisible light with a wavelength of 380-800 nm is ≤1% and the transmittance of light with a wavelength of 850-960 nm in the near-infrared region is ≥85%, meeting the application requirements of optical components in specific imaging industries.

Description

Technical Field

[0001] The present invention relates to the field of polymer materials, and particularly to a PC material capable of transmitting infrared light and a preparation method thereof. Background Art

[0002] PC (polycarbonate) is an amorphous engineering plastic. Due to its excellent impact strength, thermal stability, gloss, transparency, high refractive index, flame retardancy, anti-fouling property and other properties, it is widely used in building materials, automobiles, aerospace, medical devices, electronics, optics and other fields.

[0003] However, with the progress and development of the existing technology, the existing PC materials have gradually been unable to meet the usage requirements of industry and commerce. Especially in some applications on optical components, people hope that the product can achieve different light transmittances for different lights. Currently, the light transmittance of PC materials for light is generally as follows: the light transmittance for invisible light with a wavelength of 380 - 760 nm is ≥ 88%, and the light transmittance for near-infrared light with a wavelength of 760 - 1000 nm is ≥ 88%. However, for the camera industry, it is required that the PC material can achieve an effect that the transmittance of invisible light with a wavelength of 380 - 800 nm is ≤ 1% and the light transmittance of near-infrared light with a wavelength of 850 - 960 nm is ≥ 85%. The current PC materials cannot achieve this effect. Summary of the Invention

[0004] Based on the defects existing in the prior art, the purpose of the present invention is to provide a PC material capable of transmitting near-infrared light. This product uses a specific combination of near-infrared absorbing dyes and colorants as components to achieve an effect that the transmittance of invisible light with a wavelength of 380 - 800 nm is ≤ 1% and the light transmittance of near-infrared light with a wavelength of 850 - 960 nm is ≥ 85%, meeting the application requirements of optical components in specific camera industries.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A PC material capable of transmitting near-infrared light, comprising the following components in parts by weight:

[0007] 99.3 - 99.7 parts of PC resin, 0.001 - 0.002 parts of near-infrared light absorbing dye, and 0.1 - 0.45 parts of mixed colorant;

[0008] The near-infrared light absorbing dye is at least one of platinum-based dyes and cyanine-based dyes;

[0009] The mixed colorant is a mixture of solvent blue 97, solvent green 28, and pigment red 179.

[0010] Preferably, the color of the near-infrared light-transmitting PC material is black, and the mass ratio of the solvent blue 97, solvent green 28, and pigment red 179 is (1 to 10):(100 to 500):(5 to 15).

[0011] In the near-infrared light-transmitting PC material of the present invention, the inventors unexpectedly found through experiments that by using a specific content of platinum-based dyes and / or phthalocyanine-based dyes, they can synergistically cooperate with solvent green 28 having a phthalocyanine structure to absorb light with wavelengths in the range of 380 to 800 nm in the near-infrared region. At the same time, the mixed colorant obtained by compounding the specific solvent blue 97 and pigment red 179 with solvent green 28 can fully transmit light with a wavelength of about 940 nm, truly achieving specific screening absorption / transmission of light with wavelengths in the ranges of 380 to 800 nm and 850 to 960 nm.

[0012] Meanwhile, the near-infrared light-absorbing dyes cannot be arbitrarily selected. Using conventional near-infrared light-absorbing dyes cannot achieve a good transmittance at a wavelength of about 940 nm. Among the platinum-based dyes and phthalocyanine-based dyes of the present invention, through molecular vibration and rotational transitions, a large conjugated system is ensured, enabling strong absorption of light with wavelengths in the range of 380 to 800 nm.

[0013] Preferably, the near-infrared light-absorbing dye is a platinum-based dye, and the platinum-based dye is a thiodiene platinum complex.

[0014] More preferably, the platinum mass content in the platinum-based dye is 25 to 35%.

[0015] As described above, not any near-infrared light-absorbing dye can cooperate with the mixed colorant to achieve the light-transmitting effect of the product of the present invention. Among the platinum-based dyes and phthalocyanine-based dyes, the thiodiene platinum complex, which is a platinum-based dye, has the best effect. When the platinum mass content in this dye is maintained at 25 to 35%, the transmittance of the product for light with wavelengths in the range of 850 to 960 nm is the highest.

[0016] Preferably, the melt index of the PC resin at 300 °C under a load of 1.2 kg in accordance with ISO 1133-1:2011 is 8 to 20 g / 10 min.

[0017] Another object of the present invention is to provide a method for preparing the near-infrared light-transmitting PC material, comprising the following steps:

[0018] Mix all components evenly, then transfer them into a twin-screw extruder for melt mixing and extrusion, and then cool and pelletize to obtain the near-infrared light-transmitting PC material.

[0019] The method for preparing the near-infrared light-transmitting PC material of the present invention has simple operating steps and can achieve industrial-scale production.

[0020] Preferably, the temperature during melt mixing and extrusion is 260-290°C.

[0021] Another object of the present invention is to provide the application of the near-infrared light-transmitting PC material in the preparation of imaging optical components.

[0022] Preferably, the imaging optical component is an optical element for vehicle-mounted cameras.

[0023] The near-infrared light-transmitting PC material of the present invention expands the limitations of existing PC light-transmitting materials, can specifically absorb and transmit light of specific wavelengths, and especially meets the optical performance requirements of imaging optical components.

[0024] The beneficial effect of the present invention is that the present invention provides a near-infrared light-transmitting PC material. This product uses a specific combination of near-infrared absorbing dyes and colorants as components to achieve an invisible light transmittance of ≤1% at wavelengths of 380-800 nm and a light transmittance of ≥85% at near-infrared wavelengths of 850-960 nm, meeting the application requirements of optical components in specific imaging industries. Detailed implementation manners

[0025] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific examples and comparative examples. The purpose is to understand the content of the present invention in detail, rather than to limit the present invention. All other examples obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. The experimental reagents and instruments involved in the implementation of the present invention are all common ordinary reagents and instruments unless otherwise specified.

[0026] Examples 1-8

[0027] Examples of the near-infrared light-transmitting PC material of the present invention and its preparation method. The component composition of the near-infrared light-transmitting PC material is shown in Table 1.

[0028] The preparation method of the near-infrared light-transmitting PC material includes the following steps:

[0029] Mix all components evenly in a high-speed mixer, then transfer them to a twin-screw extruder for melt mixing and extrusion at 260-290°C, and then cool and pelletize to obtain the near-infrared light-transmitting PC material.

[0030] Comparative examples 1-7

[0031] The difference between each comparative example and the example lies only in the types and ratios of components, as shown in Table 2.

[0032] Among the components of each example and comparative example,

[0033] PC resin 1 is PC A2200 produced by Idemitsu Kosan Co., Ltd. of Japan, and its melt index at 300 °C under a load of 1.2 kg is 10 g / 10 min;

[0034] PC resin 2 is LN-2520 produced by Teijin Limited of Japan, and its melt index at 300 °C under a load of 1.2 kg is 18 g / 10 min;

[0035] Near-infrared light-absorbing dye 1 is a platinum-based dye DT19-25A DYE produced by Epolin, a thiodiene platinum complex, and the mass content of platinum is 30%. The molecular formula is as follows:

[0036] where R is NH 2 、H 2 and / or CF 3 ,,n = 0, 1, 2;

[0037] Near-infrared light-absorbing dye 2 is a cyanine-based dye, p-toluenesulfonate IR-813, produced by Wuhan Shuer Biotechnology Co., Ltd.;

[0038] Near-infrared light-absorbing dye 3 is M717 produced by Cabot, a carbon black pigment;

[0039] Near-infrared light-absorbing dye 4 is TN-870 produced by Orient Chemical Co., Ltd., an aniline black dye;

[0040] Commercially available solvent blue 97;

[0041] Commercially available solvent green 28;

[0042] Commercially available pigment red 179;

[0043] Commercially available solvent blue 67;

[0044] Commercially available solvent green 3;

[0045] Commercially available phthalocyanine blue;

[0046] Commercially available phthalocyanine red.

[0047] Unless otherwise specified, the component raw materials used in each example and comparative example of the present invention are all commercially available raw materials, and the component raw materials used in each parallel experiment are of the same kind.

[0048] Table 1

[0049] Parts by weight of components Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 PC resin 1 99.5 99.6 99.4 99.6 99.3 99.7 99.5 PC resin 2 99.5 Near-infrared light-absorbing dye 1 0.001 0.001 0.001 0.001 0.002 0.0011 0.001 Near-infrared light-absorbing dye 2 0.001 Solvent Blue 97 0.003 0.003 0.003 0.01 0.003 0.003 0.003 0.003 Pigment Red 179 0.01 0.01 0.01 0.01 0..01 0.011 0.01 0.01 Solvent Green 28 0.2 0.4 0.1 0.2 0.2 0.2 0.2 0.2

[0050] Table 2

[0051]

[0052]

[0053] In order to verify the service performance of the near-infrared light-transmissive PC material of the present invention, the products of each example and comparative example were injection molded into test specimens with a size of 100*100*2 mm at 275-285 °C by an injection molding machine, and then the transmittance of visible light with different wavelengths of the test specimens was measured by an ultraviolet-visible light spectrometer Lambda1050. The test results are shown in Tables 3 and 4.

[0054] Table 3

[0055] Light wavelength / Transmittance (%) Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 380 - 800 nm 0.5 0.28 0.98 0.35 0.2 0.5 0.5 0.9 850 - 960 nm 87.00 86.90 87.30 86.80 85.20 87.00 87.1 85.2

[0056] Table 4

[0057]

[0058] It can be seen from Tables 3 and 4 that the products of each example can achieve the effect that the transmittance of invisible light with wavelengths of 380-800 nm is ≤1% and the transmittance of light with wavelengths of 850-960 nm in the near-infrared region is ≥85%. This is mainly due to the specific combination of special near-infrared absorbing dyes and mixed colorants. In the selection of near-infrared absorbing dyes, platinum-based dyes have the best effect. In contrast, the product of Comparative Example 1 did not add near-infrared absorbing dyes and could not achieve a transmittance of invisible light with wavelengths of 380-800 nm ≤1%; Comparative Examples 2 and 3 used common near-infrared absorbing dyes in current existing products and could not achieve the same effect either. Although the types of mixed colorants used in the products of Comparative Examples 4-7 are all conventional selections of existing products, they are not combined with specific Solvent Blue 97, Pigment Red 179, and Solvent Green 28, so the products cannot achieve the expected light-transmitting effect. It can be seen from Comparative Examples 8-11 that when the addition amounts of near-infrared absorbing dyes and mixed colorants are too much or too little, it is also difficult for the products to achieve the effect that the transmittance of invisible light with wavelengths of 380-800 nm is ≤1% and the transmittance of light with wavelengths of 850-960 nm in the near-infrared region is ≥85%. At the same time, due to the excessive addition amount of mixed colorants, the product of Comparative Example 11 also had an appearance defect caused by the precipitation of oversaturated colorants.

[0059] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A near-infrared light-transmissive PC material, characterized in that, it comprises the following components in parts by weight: 99.5 - 99.9 parts of PC resin, 0.001 - 0.002 parts of near-infrared light-absorbing dye, and 0.1 - 0.45 parts of mixed colorant; the near-infrared light-absorbing dye is at least one of platinum-based dyes and cyanine-based dyes; the mixed colorant is a mixture of solvent blue 97, solvent green 28, and pigment red 179; the mass ratio of solvent blue 97, solvent green 28, and pigment red 179 is (1 - 10):(100 - 500):(5 - 15).

2. The near-infrared light-transmissive PC material according to claim 1, characterized in that, the color of the near-infrared light-transmissive PC material is black.

3. The near-infrared light-transmissive PC material according to claim 1, characterized in that, the near-infrared light-absorbing dye is a platinum-based dye, and the platinum-based dye is a thiodiene platinum complex.

4. The near-infrared light-transmissive PC material according to claim 3, characterized in that, the platinum mass content in the platinum-based dye is 25 - 35%.

5. The near-infrared light-transmissive PC material according to claim 1, characterized in that, the melt index of the PC resin at 300 °C and 1.2 kg load is 8 - 20 g / 10 min.

6. The preparation method of the near-infrared light-transmissive PC material according to any one of claims 1 - 5, characterized in that, it comprises the following steps: Mix each component evenly, then transfer it to a twin-screw extruder for melt mixing and extrusion, and then cool and pelletize to obtain the near-infrared light-transmissive PC material.

7. The preparation method of the near-infrared light-transmissive PC material according to claim 6, characterized in that, the temperature during the melt mixing and extrusion is 260 - 290 °C.

8. The application of the near-infrared light-transmissive PC material according to any one of claims 1 - 5 in the preparation of imaging optical components.

9. The application according to claim 8, characterized in that, the imaging optical component is an optical element of a vehicle-mounted camera.

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