Black transparent PC material capable of transmitting white LED light and preparation method of black transparent PC material

Abstract

The invention belongs to the technical field of high polymer materials, and relates to a black transparent PC material capable of transmitting white LED light and a preparation method thereof. The invention relates to a black transparent PC material capable of transmitting white LED light, which comprises the following components in parts by weight: 99-100 parts of PC resin and 0.5-1 part of compound toner, the compound toner is formed by compounding perylene red toner, anthraquinone blue toner and azo yellow toner according to the weight ratio of 1: (0.7-0.9): (0.8-1.2), and the azo yellow toner is azo yellow toner K1700 or azo yellow toner Ranbar P3860. The preparation method comprises the following steps: uniformly mixing the PC resin and the toner in proportion, extruding and granulating. According to the black transparent PC material, the appearance of a PC part can be black, white LED light can penetrate through the PC part, the visible light transmittance is 3.0%-4.0%, and the black transparent PC material has important application value in the field of lighting devices.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, and relates to a black transparent PC material that transmits white LED light and its preparation method. Background Technology

[0002] Polycarbonate (PC) is a high-performance engineering plastic that has attracted much attention due to its high transparency (up to 88%), excellent mechanical properties, and impact resistance. Its transparency mainly stems from its amorphous molecular structure; the aromatic rings cause the molecular chains to arrange irregularly, reducing light scattering and making PC an ideal material for LED lighting devices.

[0003] While LED lighting technology boasts advantages such as energy efficiency and long lifespan, its point light source characteristics result in glare and poor uniformity. Therefore, it typically requires the use of lampshade materials to transform it into a softer, surface light source. In high-end electronics, automotive lighting, and smart home appliances, LED lighting often requires lampshades or panels to have a black appearance. This ensures that the internal structure is concealed when the device is off, maintaining overall visual aesthetics. Simultaneously, when illuminated, it must allow pure white light to pass through with appropriate brightness. Too low a brightness results in an inability to achieve a clear display, while too high a brightness fails to conceal the internal structure, also negatively impacting visual appeal.

[0004] Currently, traditional black plastics are mostly colored with carbon black, but carbon black strongly absorbs visible light, resulting in low visible light transmittance, insufficient brightness, and an inability to achieve a clear display. Furthermore, the transmitted light tone is dark or yellowish-gray, failing to meet the requirements for pure white light transmission. In addition, existing technologies, such as the infrared-transmittable transparent black PC engineering plastic and its preparation method disclosed in patent application CN115044183A, use composite dyes to achieve a black transparent effect. While this achieves a black appearance, it appears purplish-red rather than white when transmitting LED white light.

[0005] Therefore, there is an urgent need to develop a new type of transparent PC material that can achieve a black appearance on the surface of the component, transmit white LED light, and maintain both clear display effect and visual aesthetics when lit. Summary of the Invention

[0006] The purpose of this invention is to solve the problems existing in the prior art and to provide a black transparent PC material that transmits white LED light and its preparation method.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A black transparent PC material that transmits white LED light, the components and contents by weight are: 99-100 parts PC resin, 0.5-1 part compound color powder;

[0009] The compound pigment is composed of perylene red pigment, anthraquinone blue pigment, and azo yellow pigment in a weight ratio of 1:0.7~0.9:0.8~1.2.

[0010] The azo yellow pigment is either azo yellow pigment K1700 (manufacturer: BASF, grade: K1700) or azo yellow pigment Ranbar P3860 (manufacturer: Shanghai Jingyan Chemical Co., Ltd., grade: Ranbar P3860).

[0011] The transparent PC material of this invention can achieve four effects: it can make the PC component black on the outside, while allowing white LED light to pass through. Moreover, since the visible light transmittance is 3.0%~4.0%, it can balance visual aesthetics and clear display effect when lit up.

[0012] The selection and proportion of various pigments in the compound pigment powder, as well as the amount of compound pigment powder used in black transparent PC material, are the key to achieving the above dual effects.

[0013] The compound pigment contains perylene red pigment, anthraquinone blue pigment, and azo yellow pigment. Omitting any of these three pigments, or replacing the perylene red pigment with another red pigment, or replacing the anthraquinone blue pigment with another blue pigment, or replacing the azo yellow pigment K1700 and the azo yellow pigment Ranbar P3860 with other yellow pigments, will not achieve the above four effects simultaneously.

[0014] If the amount of compound color powder in the transparent PC material is too low, although the PC material parts will still appear black, the visible light transmittance will increase significantly, making it possible for external observers to see the internal structural components or LED beads covered by the black parts. This fails to achieve the effect of concealing the internal structure or LED beads, resulting in a decrease in visual aesthetics. If the amount of compound color powder in the transparent PC material is too high, it will lead to a decrease in visible light transmittance. When the LED beads are lit, the amount of visible light transmitted and the brightness will decrease, affecting visual clarity and failing to achieve a clear display effect.

[0015] If the proportion of perylene red pigment in the compound pigment is too low, the proportion of blue and yellow pigment in the system will be too high, breaking the color balance of the PC material. Ultimately, the LED light produced by the black component will have a bluish or bluish-green visual effect, and the LED light produced by the PC material component will not achieve the requirement of white. If the proportion of perylene red pigment in the compound pigment is too high, the proportion of blue and yellow pigment in the system will be too low, breaking the color balance of the PC material. Ultimately, the LED light produced by the black component will have a purplish or purplish-red visual effect, and the LED light produced by the PC material component will also not achieve the requirement of white.

[0016] If the proportion of anthraquinone blue pigment in the compound pigment is too low, the proportion of red and yellow pigments in the system will be too high, breaking the color balance of the PC material. Ultimately, the LED light produced through the black components will have a yellowish-brown or warm brown visual effect, and the LED light produced through the PC material components will not achieve the requirement of white. If the proportion of anthraquinone blue pigment in the compound pigment is too high, the proportion of red and yellow pigments in the system will be too low, breaking the color balance of the PC material. Ultimately, the LED light produced through the black components will have a bluish-gray visual effect, and the LED light produced through the PC material components will also not achieve the requirement of white.

[0017] If the proportion of azo yellow pigment in the compound pigment is too low, the proportion of red and blue pigments in the system will be too high, breaking the color balance of the PC material. As a result, the LED light produced by the black component will have a purplish or dark purple visual effect, and the LED light produced by the PC material component will not achieve the requirement of white. If the proportion of azo yellow pigment in the compound pigment is too high, the proportion of red and blue pigments in the system will be too low, breaking the color balance of the PC material. As a result, the LED light produced by the black component will have a greenish or olive green visual effect, and the LED light produced by the PC material component will not achieve the requirement of white.

[0018] Azo yellow pigment K1700 or azo yellow pigment Ranbar P3860 ensure that while achieving a black exterior for PC components, white LED light can be transmitted, and the visible light transmittance is 3.0%~4.0%, so that visual aesthetics and clear display effects can be balanced when lit.

[0019] When the azo yellow pigment K1700 is replaced with other azo yellow pigments, or when the azo yellow pigment K1700 is replaced with a quinacrine yellow pigment, although the black and transparent white LED light on the PC component surface can still be achieved, the visible light transmittance is 2.7%~2.8%, which is low and the brightness is weak, so a clear display effect cannot be achieved when lit.

[0020] As a preferred technical solution:

[0021] The black transparent PC material that transmits white LED light as described above uses perylene red pigment 149 and anthraquinone blue pigment 104.

[0022] The above-mentioned black transparent PC material that transmits white LED light has the following components and contents by weight: 100 parts PC resin and 0.5 to 1 part compound color powder.

[0023] The black transparent PC material that transmits white LED light as described above has a melt index of 5~20g / 10min for the PC resin under the conditions of 300°C / 1.2kg.

[0024] The present invention also provides a method for preparing a black transparent PC material that transmits white LED light as described in any of the preceding claims, wherein PC resin and color powder are mixed evenly in the above proportions, and then added through the main feed port of a twin-screw extruder, extruded and granulated to obtain a black transparent PC material that transmits white LED light.

[0025] As a preferred technical solution:

[0026] As described above, the mixing is carried out using a mixer, and the mixing time is 2-5 minutes.

[0027] As described above, the twin-screw extruder operates at a speed of 400-600 r / min and a temperature of 245-275 °C.

[0028] Beneficial effects:

[0029] (1) The black transparent PC material of the present invention controls the amount of compound color powder and the ratio of perylene red color powder, anthraquinone blue color powder and azo yellow color powder. At the same time, the azo yellow color powder uses specific azo yellow color powder K1700 and azo yellow color powder Ranbar P3860. This not only achieves the appearance of the PC component as black and transparent white LED light, but also has a visible light transmittance of 3.0%~4.0%, suitable brightness, and can take into account both visual aesthetics and clear display effect when lit.

[0030] (2) The black transparent PC material of the present invention avoids the degradation effect of aniline black and other pigments on PC resin, thus ensuring the mechanical properties of the transparent PC material.

[0031] (3) The preparation method of the present invention uses mixing, extrusion and granulation. The steps are simple and easy to control, and it is suitable for large-scale industrial applications. Attached Figure Description

[0032] Figure 1 This is a photograph of the color of white light transmitted through the material sample of Example 1.

[0033] Figure 2 This is a photograph of the color of white light transmitted through the material sample of Example 2.

[0034] Figure 3 This is a photograph of the color of white light transmitted through the material sample in Comparative Example 1.

[0035] Figure 4 This is a photograph of the color of white light transmitted through the material sample in Comparative Example 2.

[0036] Figure 5 This is a photograph of the color of white light transmitted through the material sample in Example 7.

[0037] Figure 6 This is a photograph of the color of white light transmitted through the material sample in proportion 8. Detailed Implementation

[0038] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0039] In the embodiments and comparative examples of this invention, the melt flow index of the PC resin was determined using general test conditions: 300°C / 1.2kg. The following are the relevant performance testing methods for each embodiment and comparative example:

[0040] (1) Appearance and color: The prepared material sample was placed in an oven at 110℃ and dried for 6 hours. The sample was then injection molded with a length of 60mm, a width of 40mm and a thickness of 2mm using an injection molding machine. The injection temperature was 270~290℃ and the mold temperature was 100℃. The sample was then compared with the 24-color standard color card.

[0041] (2) Visible light transmittance: The prepared material sample was dried in an oven at 110℃ for 6 hours. The sample was then injection molded into a sample with a length of 60mm, a width of 40mm and a thickness of 2mm using an injection molding machine. The injection temperature was 270~290℃ and the mold temperature was 100℃. The visible light transmittance of the sample was measured using an optical transmittance meter (NS13A type, Shenzhen Nason Technology Co., Ltd.).

[0042] (3) Color of transmitted light: The prepared material sample was dried in an oven at 110°C for 6 hours. A sample with a length of 60 mm, a width of 40 mm and a thickness of 2 mm was injection molded using an injection molding machine. The injection temperature was 270~290°C and the mold temperature was 100°C. The sample was placed on a mobile phone flash (using white LED light) and the color of transmitted light was observed.

[0043] Example 1

[0044] A method for preparing a black transparent PC material that transmits white LED light, the specific steps of which are as follows:

[0045] (1) Prepare raw materials;

[0046] PC resin: melt index is 6 g / 10 min, manufacturer is Covestro, grade is PC 3207;

[0047] Perylene red pigment: Pigment Red 149, manufactured by BASF, brand name Paliogen Red K3580;

[0048] Anthraquinone blue pigment: Solvent Blue 104, manufactured by Clariant Coatings (Shanghai) Co., Ltd., brand name Solvaperm Blue 2B;

[0049] Azo yellow pigment: Pigment Yellow 183, manufactured by BASF, grade K1700;

[0050] Compound color powder: It is composed of perylene red color powder, anthraquinone blue color powder and azo yellow color powder in a weight ratio of 1:0.8:1.0;

[0051] (2) Mix 100 parts by weight of PC resin and 0.5 parts by weight of compound color powder evenly in a mixer for 3 minutes. Then add the mixture through the main feed port of a twin-screw extruder, extrude and granulate. The speed of the twin-screw extruder is 500 r / min and the temperature of the twin-screw extruder is 255℃.

[0052] When the black transparent PC material that transmits white LED light is injection molded into a 2mm thick sample, its appearance is black, its visible light transmittance is 4.0%, and the transmitted white light appears white. Figure 1 As shown.

[0053] Comparative Example 1

[0054] A method for preparing a black transparent PC material differs from Example 1 in that the anthraquinone blue pigment is replaced with an indanthrol blue pigment. The manufacturer of the indanthrol blue pigment is BASF, and the grade is L6470. The amount added remains the same.

[0055] When the obtained black transparent PC material is injection molded into a 2mm thick sample, its appearance is black, its visible light transmittance is 3.6%, and the transmitted white light appears pale yellow. Figure 3 As shown.

[0056] Compared with Example 1, the appearance of the PC material sheet in Comparative Example 1 showed no significant change; it remained black. However, the visible light transmittance decreased by 10%, and white light transmitted through it appeared pale yellow. This is because the solvent blue 104 in Example 1 can dissolve in the plastic polymer, achieving a uniform distribution at the molecular level, thus exhibiting a bright and transparent blue color. It is particularly suitable for internal coloring of PC materials, and no refraction or scattering occurs when light passes through it, thus not affecting the light transmittance. The indanthrene-based blue pigment in Comparative Example 1 has a larger molecular structure and is an insoluble organic pigment. It is mechanically broken down into tiny pigment particles and dispersed in the PC resin. When light passes through it, some loss and refraction or scattering occur, resulting in not only lower visible light transmittance but also a pale yellow color when white light passes through it.

[0057] Comparative Example 2

[0058] A method for preparing a black transparent PC material differs from Example 1 in that: the perylene red pigment is replaced with an inorganic red pigment, the manufacturer of which is BASF, brand name K2915, and the amount added remains the same.

[0059] When the obtained black transparent PC material is injection molded into a 2mm thick sample, its appearance is black, its visible light transmittance is 2.8%, and white light transmitted through it appears blue. Figure 4 As shown.

[0060] Compared with Example 1, the PC material sheet of Comparative Example 2 showed no significant change in appearance, remaining black, but its visible light transmittance decreased by 30%, and the transmitted light appeared blue. This is because the color development of the perylene red pigment Red 149 relies on its complex and large organic macromolecular conjugated system. This structure can efficiently absorb light of specific wavelengths, thereby reflecting very pure and bright red light. Its molecular-level dispersion characteristics give it high transparency and do not affect light transmittance. In contrast, the core component of the aforementioned inorganic red pigment is ferric oxide, which is an inorganic substance. Its color originates from the fine solid particles themselves. In a transparent system with the same amount of addition, its ability to display red light is far inferior to that of the perylene red pigment Red 149. In addition, the absorption and obstruction of light by the inorganic red pigment significantly reduces the visible light transmittance of the material, and the lack of red light causes white light to appear blue when transmitted.

[0061] Comparative Example 3

[0062] A method for preparing a black transparent PC material differs from Example 1 in that: azo yellow pigment K1700 is replaced with azo yellow pigment K1760, the manufacturer of which is BASF and the grade is K1760, and the amount added remains the same.

[0063] When the obtained black transparent PC material is injection molded into a sample with a thickness of 2mm, the appearance color is black, the visible light transmittance is 2.8%, and the color of white light passing through it appears white.

[0064] Compared with Example 1, the PC material sheet of Comparative Example 3 showed no significant change in appearance, remaining black. White light still transmitted through it appeared somewhat white, but the visible light transmittance decreased by 30%. This is because compared with azo yellow pigment K1700, azo yellow pigment K1760 has high opacity, resulting in a significant decrease in visible light transmittance.

[0065] Comparative Example 4

[0066] A method for preparing a black transparent PC material differs from Example 1 in that: the azo yellow pigment K1700 is replaced with a quinoline yellow pigment, the manufacturer of which is BASF, and the grade is K0961, while the amount added remains the same.

[0067] When the obtained black transparent PC material is injection molded into a sample with a thickness of 2mm, the appearance color is black, the visible light transmittance is 2.7%, and the color of the transmitted white light is white.

[0068] Compared with Example 1, the PC material sheet of Comparative Example 4 showed no significant change in appearance, remaining black, but its visible light transmittance decreased by 32.5%. This is because, compared with azo yellow pigment K1700, quinoline yellow pigment has a complex fused ring structure, strong intermolecular forces, relatively difficult dispersion, and strong light-blocking power, resulting in a significant decrease in visible light transmittance.

[0069] Comparative Example 5

[0070] A method for preparing a black transparent PC material differs from Example 1 in that the amount of compound color powder used is too small, the weight parts of PC resin are 100, and the weight parts of compound color powder are 0.1.

[0071] When the obtained black transparent PC material is injection molded into a sample with a thickness of 2mm, the appearance color is black, the visible light transmittance is 7.0%, and the color of the transmitted white light is white.

[0072] Compared with Example 1, the appearance of the PC material sheet in Comparative Example 5 was not significantly different, and it was still black. However, the visible light transmittance increased by 75%. This is because the content of the compound pigment in the PC material was too low, the pigment’s ability to block visible light was reduced, and the visible light transmittance increased significantly. At the same time, the PC material’s ability to cover the internal structure of the component was significantly reduced, and the internal structure of the component could be observed. It was difficult to achieve the bottom-covering effect of the PC material.

[0073] Comparative Example 6

[0074] A method for preparing a black transparent PC material differs from Example 1 in that the amount of compound color powder used is excessive, with the PC resin having a weight ratio of 100 and the compound color powder having a weight ratio of 2.

[0075] When the obtained black transparent PC material is injection molded into a sample with a thickness of 2mm, the appearance color is black, the visible light transmittance is 1.2%, and the color of the transmitted white light is white.

[0076] Compared with Example 1, the PC material sheet of Comparative Example 6 showed no significant change in appearance, remaining black, but the visible light transmittance decreased by 70%. The brightness of white light transmitted through the PC material sheet decreased significantly, resulting in unclear display effects. This is because the concentration of the compound pigment in the PC material was too high, increasing the pigment's ability to block visible light and directly affecting the transmission effect of white light.

[0077] Comparative Example 7

[0078] A method for preparing a black transparent PC material differs from Example 1 in that the ratio of anthraquinone blue pigment to azo yellow pigment is too small, and the compound pigment is composed of perylene red pigment, anthraquinone blue pigment, and azo yellow pigment in a weight ratio of 1:0.5:1.2.

[0079] When the obtained black transparent PC material is injection molded into a 2mm thick sample, its appearance is black, its visible light transmittance is 3.2%, and the transmitted white light appears orange-red. Figure 5 As shown.

[0080] Compared with Example 1, the PC material sheet of Comparative Example 7 showed no significant change in appearance, remaining black. However, its visible light transmittance decreased by 20%. This was because the ratio of anthraquinone blue pigment to azo yellow pigment was too small, resulting in a small amount of blue pigment added to the compound pigment system and a high proportion of yellow pigment. This disrupted the overall color balance, causing the light passing through the black component to appear orange. This color not only blocked the transmission of visible light and reduced the visible light transmittance to some extent, but also failed to meet the requirement that white light passing through should appear white.

[0081] Comparative Example 8

[0082] A method for preparing a black transparent PC material differs from Example 1 in that the ratio of anthraquinone blue pigment to azo yellow pigment is too large, and the compound pigment is composed of perylene red pigment, anthraquinone blue pigment, and azo yellow pigment in a weight ratio of 1:1.0:0.7.

[0083] When the obtained black transparent PC material is injection molded into a 2mm thick sample, its appearance is black, its visible light transmittance is 3.6%, and the transmitted white light appears blue. Figure 6 As shown.

[0084] Compared with Example 1, the PC material sheet of Comparative Example 7 showed no significant change in appearance, remaining black. However, the visible light transmittance decreased by 10%. This was because the ratio of anthraquinone blue pigment to azo yellow pigment was too small, resulting in a small amount of yellow pigment added to the compound pigment system and a high proportion of blue pigment. This disrupted the overall color balance, causing the light passing through the black component to appear bluish. This color not only blocked visible light transmission and reduced the visible light transmittance but also failed to meet the requirement that white light passing through should appear white.

[0085] Example 2

[0086] A method for preparing a black transparent PC material that transmits white LED light, the specific steps of which are as follows:

[0087] (1) Prepare raw materials;

[0088] PC resin: melt index is 10g / 10min, manufacturer is Lotte Chemical, grade is PC1100;

[0089] Perylene red pigment: Pigment Red 149, manufactured by Clariant Coatings (Shanghai) Co., Ltd., brand name PV FastRed B;

[0090] Anthraquinone blue pigment: Solvent Blue 104, manufactured by Shanghai Jingyan Chemical Co., Ltd., brand name Ranbar Blue 2B;

[0091] Azo yellow pigment: Pigment Yellow 183, manufactured by BASF, grade K1700;

[0092] Compound color powder: It is composed of perylene red color powder, anthraquinone blue color powder and azo yellow color powder in a weight ratio of 1:0.7:0.8;

[0093] (2) Mix 100 parts by weight of PC resin and 1 part by weight of compound color powder evenly in a mixer for 2 minutes, then add it through the main feed port of a twin-screw extruder, extrude and granulate. The rotation speed of the twin-screw extruder is 400 r / min and the temperature of the twin-screw extruder is 245℃.

[0094] When the black transparent PC material that transmits white LED light is injection molded into a 2mm thick sample, its appearance is black, its visible light transmittance is 3.0%, and the transmitted white light appears white. Figure 2 As shown.

[0095] Example 3

[0096] A method for preparing a black transparent PC material that transmits white LED light, the specific steps of which are as follows:

[0097] (1) Prepare raw materials;

[0098] PC resin: melt index is 15g / 10min, manufacturer is Mitsubishi Chemical, grade is PC S3000;

[0099] Perylene red pigment: Pigment Red 149, manufactured by BASF, brand name Paliogen Red K3580;

[0100] Anthraquinone blue pigment: Solvent Blue 104, manufactured by Shanghai Jingyan Chemical Co., Ltd., brand name Ranbar Blue 2B;

[0101] Azo yellow pigment: Pigment Yellow 183, manufactured by Shanghai Jingyan Chemical Co., Ltd., brand name Ranbar P3860;

[0102] Compound color powder: It is composed of perylene red color powder, anthraquinone blue color powder and azo yellow color powder in a weight ratio of 1:0.9:1.2;

[0103] (2) Mix 100 parts by weight of PC resin and 0.7 parts by weight of compound color powder evenly in a mixer for 5 minutes. Then add the mixture through the main feed port of a twin-screw extruder, extrude and granulate. The rotation speed of the twin-screw extruder is 600 r / min and the temperature of the twin-screw extruder is 255℃.

[0104] When the black transparent PC material that transmits white LED light is injection molded into a sample with a thickness of 2mm, the appearance color is black, the visible light transmittance is 3.7%, and the color of the transmitted white light is white.

[0105] Example 4

[0106] A method for preparing a black transparent PC material that transmits white LED light, the specific steps of which are as follows:

[0107] (1) Prepare raw materials;

[0108] PC resin: melt index is 20g / 10min, manufacturer is Cangzhou Dahua Co., Ltd., grade is PCCH8225;

[0109] Perylene red pigment: Pigment Red 149, manufactured by BASF, brand name Paliogen Red K3580;

[0110] Anthraquinone blue pigment: Solvent Blue 104, manufactured by Clariant Coatings (Shanghai) Co., Ltd., brand name Solvaperm Blue 2B;

[0111] Azo yellow pigment: Pigment Yellow 183, manufactured by BASF, grade K1700;

[0112] Compound color powder: It is composed of perylene red color powder, anthraquinone blue color powder and azo yellow color powder in a weight ratio of 1:0.9:0.8;

[0113] (2) Mix 100 parts by weight of PC resin and 0.9 parts by weight of compound color powder evenly in a mixer for 4 minutes. Then add the mixture through the main feed port of a twin-screw extruder, extrude and granulate. The rotation speed of the twin-screw extruder is 450 r / min and the temperature of the twin-screw extruder is 265℃.

[0114] When the black transparent PC material that transmits white LED light is injection molded into a sample with a thickness of 2mm, the appearance color is black, the visible light transmittance is 3.4%, and the color of the transmitted white light is white.

[0115] Example 5

[0116] A method for preparing a black transparent PC material that transmits white LED light, the specific steps of which are as follows:

[0117] (1) Prepare raw materials;

[0118] PC resin: melt index is 20g / 10min, manufacturer is Wanhua Chemical Group Co., Ltd., grade is PCA1227;

[0119] Perylene red pigment: Pigment Red 149, manufactured by Clariant Coatings (Shanghai) Co., Ltd., brand name PV FastRed B;

[0120] Anthraquinone blue pigment: Solvent Blue 104, manufactured by Shanghai Jingyan Chemical Co., Ltd., brand name Ranbar Blue 2B;

[0121] Azo yellow pigment: Pigment Yellow 183, manufactured by Shanghai Jingyan Chemical Co., Ltd., brand name Ranbar P3860;

[0122] Compound color powder: It is composed of perylene red color powder, anthraquinone blue color powder and azo yellow color powder in a weight ratio of 1:0.7:1.2;

[0123] (2) Mix 100 parts by weight of PC resin and 0.9 parts by weight of compound color powder evenly in a mixer for 5 minutes. Then add the mixture through the main feed port of a twin-screw extruder, extrude and granulate. The rotation speed of the twin-screw extruder is 550 r / min and the temperature of the twin-screw extruder is 275℃.

[0124] When the black transparent PC material that transmits white LED light is injection molded into a sample with a thickness of 2mm, the appearance color is black, the visible light transmittance is 3.2%, and the color of the transmitted white light is white.

Claims

1. A black transparent PC material that transmits white LED light, characterized in that, By weight, the components and their contents are as follows: 99-100 parts PC resin, 0.5-1 part compound color powder; The compound pigment is composed of perylene red pigment, anthraquinone blue pigment, and azo yellow pigment in a weight ratio of 1:0.7~0.9:0.8~1.

2. The azo yellow pigment is either azo yellow pigment K1700 or azo yellow pigment Ranbar P3860.

2. The black transparent PC material that transmits white LED light according to claim 1, characterized in that, The perylene red pigment is Pigment Red 149, and the anthraquinone blue pigment is Solvent Blue 104.

3. The black transparent PC material that transmits white LED light according to claim 1, characterized in that, By weight, the components and their contents are as follows: 100 parts PC resin, 0.5 to 1 part compound color powder.

4. The black transparent PC material that transmits white LED light according to claim 1, characterized in that, At 300°C / 1.2kg, the melt index of PC resin is 5~20g / 10min.

5. A method for preparing a black transparent PC material that transmits white LED light as described in any one of claims 1 to 4, characterized in that, PC resin and color powder are mixed evenly according to the above ratio, and then fed into the main feed port of a twin-screw extruder. The mixture is then extruded and granulated to obtain a black transparent PC material that transmits white LED light.

6. The method according to claim 5, characterized in that, Mixing is performed using a mixer, and the mixing time is 2-5 minutes.

7. The method according to claim 5, characterized in that, The twin-screw extruder has a rotational speed of 400~600 r / min and a temperature of 245~275℃.

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