Night vision compatible lighting and near infrared cut-off pc optical material and preparation and application thereof

Abstract

The application discloses night-vision compatible lighting and near-infrared cut-off PC optical material and preparation and application thereof, and comprises the following components in mass fractions: 98-99.8 parts of polycarbonate resin, 0.05-0.12 parts of near-infrared absorber, 0.01-0.1 parts of colorant, 1.5-3 parts of functional additive, 0.3-0.5 parts of synergistic additive, the near-infrared absorber is a thio-bisole nickel metal complex, and the chemical structure of the thio-bisole nickel metal complex is shown in formula (I): wherein R is selected from any one of -H, -OCH3 and -C(CH3)3; and the problem that the night-vision compatible lighting and near-infrared cut-off PC optical material cannot simultaneously consider one-time forming and optical performance is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical material technology, in particular to a night vision compatible lighting and near-infrared cut-off PC optical material and its preparation and application. BACKGROUND

[0002] Night vision compatible technology refers to eliminating the light and radiation emitted by the lighting system in the cabin that interferes with the work of the night vision device through certain technical means, thereby ensuring the normal work of the night vision device. Using near-infrared absorbing materials to absorb interfering light is an important means to achieve night vision compatibility technology. According to the application needs of night vision compatibility technology, night vision compatible materials should have strong absorption or blocking effect on light in the red light region and near-infrared light region 660nm-930nm range, while ensuring sufficient transmittance of light in the range of 400nm-630nm. Such materials are mainly used in aircraft lighting devices, which requires the material to be light in weight, high in strength, excellent in weather resistance and reliable in use.

[0003] Currently, in the field of night vision compatible lighting and near-infrared cut-off PC optical material technology, the near-infrared cut-off or absorption function is often achieved by adding one or more layers of near-infrared absorbing layer on the surface of the PC product. Most of the near-infrared absorbing layer is attached to the surface of the PC product by dipping or coating process. The near-infrared functional additive needs to be dissolved in dichloromethane, acetone, organic solvents, acrylic resin, and resin curing agent before operation. The existing process technology has several shortcomings: the forming process is complex and cannot be injection molded at one time; the near-infrared absorbing agent is not resistant to heat and is easily degraded and fails due to thermal oxidation during injection molding; the dipping or coating process requires the use of organic solvents, which is not environmentally friendly; and the coating layer is easily scratched and peeled off during use.

[0004] Therefore, there is an urgent need for a night vision compatible lighting and near-infrared cut-off PC optical material that can be formed in one step and ensure optical performance, achieving an average transmittance of 20-55% for visible light with a wavelength of 400-700nm, an average transmittance of 0.05-0.2% for near-infrared light with a wavelength of 800-1000nm, and a haze of less than 1.5%, while having the functions of night vision compatible lighting and near-infrared cut-off. SUMMARY

[0005] Therefore, the present application provides a night vision compatible lighting and near-infrared cut-off PC optical material and its preparation and application, which solves the problem of one-step forming and optical performance of night vision compatible lighting and near-infrared cut-off PC optical material.

[0006] To achieve the above technical purpose, the present application adopts the following technical scheme:

[0007] In a first aspect, the present application provides a night vision compatible lighting and near-infrared cut-off PC optical material, comprising components in mass fractions as follows: 98-99.8 parts of polycarbonate resin, for example, 98.4 parts, 98.8 parts, 99.2 parts; 0.05-0.12 parts of near-infrared absorber, for example, 0.07 parts, 0.08 parts, 0.1 parts; 0.01-0.1 parts of colorant, 1.5-3 parts of functional additive, 0.3-0.5 parts of synergistic additive, the near-infrared absorber is a nickel metal complex of thio-bisolefin, and the chemical structure of the nickel metal complex of thio-bisolefin is shown in formula (I):

[0008] wherein R group is selected from any one of -H, -OCH3, -C(CH3)3.

[0009] In the present application, the polycarbonate is bisphenol A type polycarbonate, and the mass percentage of polycarbonate in the composition is preferably not less than 80%, more preferably not less than 90%, and more preferably not less than 95%.

[0010] Preferably, the melt flow rate is 5-30 g / 10 min, for example, 8 g / 10 min, 10 g / 10 min, 15 g / 10 min, 20 g / 10 min, 25 g / 10 min, measured at 300°C, 1.2 KG, ASTM D-1238, and the mass percentage of polycarbonate in the composition is preferably not less than 98%, more preferably not less than 98.5%, and more preferably not less than 99%.

[0011] Preferably, it further comprises 0.01-0.1 parts of colorant and 1-3 parts of functional additive.

[0012] Preferably, the colorant is one or more of phthalocyanine, anthraquinone, and quinoline pigments.

[0013] Preferably, the functional additive comprises one or more of antioxidants, lubricants, and light stabilizers.

[0014] Preferably, the synergistic additive is a zinc salt ionomer of ethylene acrylic acid copolymer, and the molecular weight range thereof is 1000-3000 and the melting point is 99-110°C, tested by end group analysis method.

[0015] Preferably, in the near-infrared absorber, the R group is -OCH3, which is more conductive than -H and -C(CH3)3, and is conducive to narrowing the energy bandwidth between the highest occupied orbital and the lowest unoccupied orbital, so as to move the maximum absorption wavelength to the long wave direction.

[0016] Preferably, the functional additive is a mixture of equal mass fractions of antioxidants, lubricants, and light stabilizers.

[0017] In a second aspect, the application provides a preparation method of night vision compatible lighting and near-infrared cut-off PC optical material, comprising the following steps: mixing polycarbonate resin, near-infrared absorber, colorant and functional additive, and then extruding and molding by using a double screw extruder, to obtain the night vision compatible lighting and near-infrared cut-off PC optical material.

[0018] Preferably, the extrusion temperature of the double screw extruder is 280-300℃.

[0019] In a third aspect, the application provides application of the night vision compatible lighting and near-infrared cut-off PC optical material in low-light night vision lighting system and laser protection material.

[0020] The application has the following beneficial effects: by adding ethylene acrylic acid copolymer zinc salt ionomer in PC material, the shear force in the extrusion and injection molding process can be effectively reduced, the near-infrared absorber is protected from being damaged by shear force, the dispersion of the near-infrared absorber in the PC material is improved, the near-infrared absorption function is improved, and the one-piece molding is realized while the optical performance is met. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the application clearer, the application is further described in detail below with reference to examples. It should be understood that the specific examples described herein are only used to explain the application and do not limit the application.

[0022] Source of raw materials

[0023] Polycarbonate resin-1: purchased from Mitsubishi, Japan, model CLS400, melt flow rate is about 8g / 10min, measured at 300℃, 1.2KG, ASTM D-1238;

[0024] Near-infrared absorber-1: purchased from Epolin, USA, structural formula:

[0025]

[0026] Near-infrared absorber-2: purchased from Epolin, USA, structural formula:

[0027]

[0028] Near-infrared absorber-3: purchased from Epolin, USA, structural formula:

[0029]

[0030] Colorant: HELIOGEN GREEN K8730 purchased from BASF, Germany;

[0031] Antioxidant-1, Irganox 1010, purchased from Ciba Company;

[0032] Lubricant, GLYCOLUBE-P, purchased from LOZA Company, pentaerythritol stearate; Light stabilizer: RIASORB UV-234, purchased from Tianjin Li'anlong, benzotriazole;

[0033] Synergistic aid: AClyn 295, purchased from Honeywell, zinc salt ionomer of ethylene acrylic acid copolymer. The following further illustrates the scheme through specific examples.

[0034] Examples 1-6 and Comparative Examples 1-4

[0035] A night vision compatible lighting and near-infrared cut-off PC optical material, the component preparation is shown in Table 1; the preparation method of the above night vision compatible lighting and near-infrared cut-off PC optical material is as follows: the polycarbonate resin is fully dried, the drying temperature is 110-120℃, and the drying time is 2-4 hours; the near-infrared absorber, colorant and functional aid are mixed at high speed for 3-5 minutes by using high shear mixing equipment, and then the sample particles are extruded and formed by using a twin-screw extruder, the extrusion temperature is 280-300℃, and the night vision compatible lighting and near-infrared cut-off PC optical material is obtained.

[0036] Table 1 Component preparation of examples and comparative examples

[0037]

[0038] Evaluation test

[0039] The optical material obtained from the examples and comparative examples is tested; the test method is as follows: the material prepared by the above method is dried at 110-120℃, the drying time is 2-4 hours, an injection molding machine is used to injection mold into a color plate with a length, width and height of 100*100*2mm, the transmittance at a wavelength of 400-1000nm is tested by using a U.S. platinum Elmer LAMBDA 1050 spectrophotometer, and the haze is tested by using a Japanese electric color NDH7000 haze meter.

[0040] The test results are shown in Table 2.

[0041] Table 2 Test results

[0042]

[0043] From the above results, by adding near-infrared absorber-nickel metal complex of thio-bisolefin and ethylene acrylic acid copolymer zinc salt ionomer can achieve synergistic effect, meet the optical performance, the average transmittance of visible light in the wavelength range of 400-700nm is 20-55%; the average transmittance of near-infrared light in the wavelength range of 800-1000nm is 0.05-0.2%, and the haze is lower than 1.5%. The weight percentage of nickel thio-bisolefin is extremely critical to the material performance, too much content leads to the average transmittance of 400-700nm light lower than 20%, too low content leads to the average transmittance of 800-1000nm light higher than 0.2%. And the effect of near-infrared absorber with-OCH3 as substituent group is better than that without substituent group. At the same time, too little content of ethylene acrylic acid copolymer zinc salt ionomer will affect the dispersion of near-infrared absorber and reduce the optical performance; but too high content will also increase the haze.

[0044] The PC material of the present application can be directly used for injection molding or extrusion one-time forming processing, which can meet the requirements of night vision compatible lighting and near-infrared cutoff use, without subsequent dyeing, coating or coating process for the near-infrared absorbing layer of the product, the forming process is simple, reduces the pollution of organic solvents to the environment, and there is no risk of coating layer falling off.

[0045] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A night vision compatible illumination and near infrared cut-off PC optical material characterized in that, The composition comprises the following components by mass fraction: 98-99.8 parts of polycarbonate resin, 0.05-0.12 parts of near-infrared absorber, 0.3-0.5 parts of synergistic auxiliary agent, wherein the near-infrared absorber is a nickel metal complex of thio-bisolefin, and the chemical structure of the nickel metal complex of thio-bisolefin is shown in formula (I): wherein the R group is selected from any one of -H, -OCH3, -C(CH3)3; The synergistic auxiliary agent is a zinc salt ionomer of ethylene acrylic acid copolymer.

2. The night vision compatible illumination and near infrared cut-off PC optical material of claim 1, wherein, The melt flow rate of the polycarbonate is 5-30 g / 10 min at 300 ℃, 1.2 KG, ASTM D-1238.

3. The night vision compatible illumination and near infrared cut-off PC optical material of claim 1, wherein, It also comprises 0.01-0.1 parts of colorant and 1-3 parts of functional auxiliary agent.

4. The night vision compatible illumination and near infrared cut-off PC optical material of claim 1, wherein, The colorant is one or more of phthalocyanine, anthraquinone and quinoline pigments; and the functional auxiliary agent comprises one or more of antioxidants, lubricants and light stabilizers.

5. The night vision compatible illumination and near infrared cut-off PC optical material of claim 1, wherein, In the near-infrared absorber, R is -OCH3.

6. The night vision compatible illumination and near infrared cut-off PC optical material of claim 1, wherein, The functional auxiliary agent is a mixture of equal mass fraction of antioxidants, lubricants and light stabilizers.

7. A method of making a night vision compatible lighting and near infrared cut PC optical material as claimed in any one of claims 1 to 6, characterized in that, The method comprises the following steps: mixing polycarbonate resin, near-infrared absorber, synergistic auxiliary agent, colorant and functional auxiliary agent, and then extruding and molding by using a double-screw extruder to obtain the night-vision compatible lighting and near-infrared cut-off PC optical material.

8. The method for preparing the PC optical material for night vision compatible illumination and near-infrared cutoff according to claim 7, characterized in that, The extrusion temperature of the double-screw extruder is 280-300 ℃.

9. Use of the night-vision compatible lighting and near-infrared cut-off PC optical material according to any one of claims 1-6 or prepared by the method of any one of claims 7-8 in low-light night-vision lighting systems and laser protection materials.

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