Infrared penetrating polycarbonate composite material and preparation method and application thereof

Abstract

The present invention provides an infrared penetrating polycarbonate composite material and its preparation method and application, and relates to the technical field of PC materials. Specifically, it includes a quantum dot composite layer, and a barrier composite layer arranged on at least one side of the quantum dot composite layer; the quantum dot composite layer includes the following components: polycarbonate, rare earth luminescent material and color powder; the barrier composite layer includes the following components: polycarbonate and scattering material. The present invention prepares a composite material with high infrared transmittance and strong flame retardancy based on the basic polymer raw material of PC resin, which gives the color vision of the color powder in the visible light range, but can transmit the near-infrared region with a wavelength of 800nm ​​to 1600nm or more. The infrared transmittance ranges from 80% to 91% according to its thickness, working band and color requirements, and has good application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of PC materials, and in particular to an infrared penetrating polycarbonate composite material and a preparation method and application thereof. Background Art

[0002] Infrared (IR) is an electromagnetic wave with a frequency between microwaves and visible light. It is a general term for radiation with a frequency of 0.3THz to 400THz in the electromagnetic spectrum and a wavelength of 760nm to 1000um in a vacuum. In the electromagnetic spectrum, radiation outside red light, with a frequency lower than visible light and higher than microwaves is called infrared (radiation outside violet light, with a frequency higher than visible light and lower than X-rays is called ultraviolet). Infrared is invisible to the naked eye and belongs to invisible light. It has a wide range of uses in communications, detection, medical treatment, military, etc., such as remote control, air conditioning, television, and automobiles.

[0003] Infrared transparent material is a material that allows infrared light to pass through without causing significant absorption or reflection; it is widely used in infrared remote control receivers, infrared sensors, glasses, night vision instruments, infrared, etc. Traditional infrared transparent materials are generally made of transparent materials such as PC, PMMA, MABS and PS. Among them, PC has high transparency and infrared transmittance and is a more common infrared transparent material; however, PC also has defects such as poor aging resistance and flame retardancy; and the process of using PC for infrared transparent materials is relatively old, so it is necessary to upgrade the PC infrared transparent material and prepare a PC infrared transparent material with better performance.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The first object of the present invention is to provide an infrared-transmitting polycarbonate composite material: comprising a quantum dot composite layer and a barrier composite layer arranged on at least one side of the quantum dot composite layer; the quantum dot composite layer comprises the following components: polycarbonate, rare earth luminescent material and color powder; the barrier composite layer comprises the following components: polycarbonate and scattering material.

[0006] Preferably, the infrared-transmitting polycarbonate composite material consists of the quantum dot composite layer and the barrier composite layer arranged on both sides of the quantum dot composite layer.

[0007] Preferably, the rare earth luminescent material includes at least one of cadmium selenide or indium phosphide.

[0008] Preferably, the scattering material comprises at least one of titanium dioxide or silicon dioxide.

[0009] Preferably, the toner is black.

[0010] Preferably, the quantum dot composite layer and the barrier composite layer further include: one or more of an antioxidant, an anti-ultraviolet agent, a co-solvent, a dispersant and a lubricant.

[0011] Preferably, the quantum dot composite layer comprises the following components by weight: 80-120 parts of polycarbonate, 0.5-20 parts of rare earth luminescent material and 5-20 parts of color powder.

[0012] Preferably, the barrier composite layer comprises the following components by weight: 80 to 120 parts of polycarbonate and 0.5 to 30 parts of scattering material.

[0013] Preferably, the infrared-transmitting polycarbonate composite material comprises 40 to 120 parts by weight of the quantum dot composite layer and 20 to 80 parts by weight of the barrier composite layer.

[0014] The second object of the present invention is to provide a method for preparing the infrared-transmitting polycarbonate composite material, comprising the following steps: mixing the raw material components of the quantum dot composite layer and the barrier composite layer respectively, and then performing injection molding to form a film, and composite-treating the obtained quantum dot composite layer and the barrier composite layer to obtain the infrared-transmitting polycarbonate composite material.

[0015] Preferably, the composite treatment includes pressing under roller traction; the infrared-transmitting polycarbonate composite material is applied in the form of a film, the thickness of the film is 0.125mm~1.0mm, including but not limited to 0.125mm, 0.25mm, 0.5mm, 0.75mm, 1.0mm; the width and length of the film are not limited and can be tailored as appropriate according to the application.

[0016] The third object of the present invention is to provide an application of the infrared-transmitting polycarbonate composite material: specifically, it has a wide range of uses in many fields such as infrared communication, infrared windows, infrared photography, infrared welding or infrared thermal energy regulation.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention prepares a composite material with high infrared transmittance and strong flame retardancy based on PC resin as a basic polymer raw material, which gives color vision to toner in the visible light range, but can transmit the near-infrared region with a wavelength of 800nm ​​to 1600nm or more. The infrared transmittance ranges from 80% to 91% according to its thickness, working band and color requirements, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a curve diagram of infrared transmittance variation of a composite material according to an embodiment of the present invention;

[0021] Figure 2 It is a curve diagram of infrared transmittance variation of each composite material in the test examples of the present invention. DETAILED DESCRIPTION

[0022] The technical scheme of the present invention will be clearly and completely described below in conjunction with specific embodiments, but it will be appreciated by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work, all belong to the scope of protection of the present invention. If specific conditions are not indicated in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not indicated in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0023] The present invention is implemented as follows: an infrared-transmitting polycarbonate composite material includes a quantum dot composite layer and a barrier composite layer arranged on at least one side of the quantum dot composite layer; as a preferred embodiment, the infrared-transmitting polycarbonate composite material consists of the quantum dot composite layer and the barrier composite layer arranged on both sides of the quantum dot composite layer.

[0024] As a preferred embodiment, the quantum dot composite layer includes but is not limited to 40, 50, 60, 70, 80, 90, 100, 110, 120 parts by weight, and the barrier composite layer includes but is not limited to 20, 30, 40, 50, 60, 70, 80 parts by weight; the weight of the barrier composite layer is related to the number of layers (the quantum dot composite layer is set on one side or on both sides). As a more preferred embodiment, the thickness of the quantum dot composite layer is 5nm to 100nm.

[0025] As a preferred embodiment, the quantum dot composite layer comprises the following components in parts by weight: polycarbonate including but not limited to 80, 85, 90, 95, 100, 105, 110, 115, 120 parts, rare earth luminescent materials including but not limited to 0.5, 1, 5, 10, 15, 20 parts and color powder including but not limited to 5, 10, 15, 20 parts; the barrier composite layer comprises the following components: polycarbonate including but not limited to 80, 85, 90, 95, 100, 105, 110, 115, 120 parts and scattering materials including but not limited to 0.5, 1, 5, 10, 15, 20, 25, 30 parts.

[0026] As a preferred embodiment, the rare earth luminescent material includes at least one of cadmium selenide or indium phosphide; as a more preferred embodiment, the rare earth luminescent material includes at least one of cadmium selenide-zinc sulfide (CdSe / ZnS) or indium phosphide-zinc sulfide (InP / ZnS).

[0027] As a preferred embodiment, the scattering material includes at least one of titanium dioxide or silicon dioxide; in the present invention, the scattering material is in a granular state and distributed on the surface of the barrier composite layer to play a role in light scattering.

[0028] As a preferred embodiment, the toner is black toner.

[0029] As a preferred embodiment, the quantum dot composite layer and the barrier composite layer further include: one or more of an antioxidant, an anti-ultraviolet agent, a cosolvent, a dispersant and a lubricant. The selection of the above-mentioned additives can adopt conventional selections suitable for PC materials, preferably without negatively affecting infrared transmittance.

[0030] The preparation method of the infrared-transmitting polycarbonate composite material comprises the following steps: respectively mixing the raw material components of the quantum dot composite layer and the barrier composite layer, then performing injection molding to form a film, and composite-treating the obtained quantum dot composite layer and the barrier composite layer to obtain the infrared-transmitting polycarbonate composite material.

[0031] Example

[0032] (1) Raw material selection and mixing: The quantum dot composite layer includes 120 parts of polycarbonate, 15 parts of rare earth luminescent material (CdSe / ZnS), 20 parts of black powder, 2 parts of antioxidant (3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate), and 1 part of lubricant (stearic acid); the barrier composite layer includes 80 parts of polycarbonate, 10 parts of scattering material (TiO2), and 1 part of anti-ultraviolet agent (2-(2'-hydroxy-5'-methylphenyl) benzotriazole).

[0033] (2) Injection molding: The specific process parameters are shown in Table 1 below. The obtained film thickness is 0.5 mm.

[0034] Table 1

[0035]

[0036]

[0037] (3) Performance test: The test method and results are shown in Table 2 below.

[0038] Table 2

[0039]

[0040]

[0041] Test example

[0042] (1) The black infrared-transmitting polycarbonate composite material prepared in the example is used; at the same time, the black powder used in the example is replaced with toners of other colors for synthesis (keeping all other conditions unchanged and only changing the color of the toner), and purple, blue, green, brown, and red infrared-transmitting polycarbonate composite materials are prepared respectively.

[0043] (2) Infrared transmittance performance test: The Fourier transform method was used again to test the composite material prepared above. The results are as follows: Figure 1 , Figure 2 shown.

[0044] Figure 1 The transmittance curves of purple (upper left) and blue (lower right) infrared-transmitting polycarbonate composite materials are shown respectively; Figure 2 In the figure, the transmittance of 10% is used as the standard for explanation, and from left to right are: black type, purple type, green type, brown type, blue type, and green type transmittance curves of infrared-transmitting polycarbonate composite materials (the curves of the purple type and the green type have a high overlap).

[0045] Although the present invention has been illustrated and described with specific embodiments, it should be appreciated that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Those skilled in the art should understand that the technical solutions described in the above embodiments may be modified, or some or all of the technical features thereof may be replaced by equivalents without departing from the spirit and scope of the present invention. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. Therefore, this means that all such replacements and modifications within the scope of the present invention are included in the appended claims.

Claims

1. An infrared-transmitting polycarbonate composite material, characterized in that: It includes a quantum dot composite layer, and a barrier composite layer disposed on at least one side of the quantum dot composite layer; The quantum dot composite layer comprises the following components: polycarbonate, rare earth luminescent material and color powder; the barrier composite layer comprises the following components: polycarbonate and scattering material; The rare earth luminescent material includes at least one of cadmium selenide or indium phosphide; the scattering material includes at least one of titanium dioxide or silicon dioxide; the toner is black; The quantum dot composite layer includes the following components by weight: 80-120 parts of polycarbonate, 0.5-20 parts of rare earth luminescent material and 5-20 parts of color powder; The barrier composite layer comprises the following components by weight: 80-120 parts of polycarbonate and 0.5-30 parts of scattering material.

2. The infrared-transmitting polycarbonate composite material according to claim 1, characterized in that: The infrared-transmitting polycarbonate composite material consists of the quantum dot composite layer and the barrier composite layer arranged on both sides of the quantum dot composite layer.

3. The infrared-transmitting polycarbonate composite material according to claim 1, characterized in that: The quantum dot composite layer and the barrier composite layer further include: one or more of an antioxidant, an anti-ultraviolet agent, a co-solvent, a dispersant and a lubricant.

4. The infrared-transmitting polycarbonate composite material according to claim 1, characterized in that: The infrared-transmitting polycarbonate composite material comprises 40 to 120 parts by weight of the quantum dot composite layer and 20 to 80 parts by weight of the barrier composite layer.

5. The method for preparing the infrared-transmitting polycarbonate composite material according to any one of claims 1 to 4, comprising the following steps: The raw material components of the quantum dot composite layer and the barrier composite layer are mixed respectively, and then injection molding is performed to form a film, and the obtained quantum dot composite layer and the barrier composite layer are composited to obtain the infrared-transmitting polycarbonate composite material.

6. Use of the infrared-transmitting polycarbonate composite material according to any one of claims 1 to 4 in infrared communication, infrared windows, infrared photography, infrared welding or infrared thermal energy regulation.

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