Composite polycarbonate material, preparation method and lamp

Abstract

The invention discloses a composite polycarbonate material, a preparation method and a lamp, and the composite polycarbonate material comprises the following raw materials by weight: 80.5-85.2 parts of polycarbonate; 5 to 10 parts of acrylonitrile-styrene-acrylate copolymer; 5 to 9 parts of carbon nanotube master batch; 0.5-1 part of a dispersant; 0.1 to 0.3 part of an antioxidant; and 0.1-0.3 part of an anti-aging auxiliary agent. The composite polycarbonate material has lower surface resistivity, better dust adsorption resistance, higher flowability, faster forming period and more excellent light-oxygen aging performance, and when the composite polycarbonate material is applied to a shell or a reflector of a lamp, the problem of dust adsorption of the lamp can be greatly reduced, and the service life of the lamp can be prolonged. And the glare problem of the lamp can be obviously reduced.

Description

Technical Field

[0001] The present invention relates to the fields of materials and lighting, and particularly to a composite polycarbonate material, a preparation method thereof, and a lamp. Background Art

[0002] With the improvement of our requirements for the quality of life, people's requirements for lighting fixtures are also getting higher and higher. Currently, in addition to having more and stronger functions, for the appearance of LED lamps on the market, people have higher and higher requirements for the appearance of the lamps.

[0003] Improving the aesthetics of the lamp mainly depends on the lamp housing, and the material used for the housing is crucial for the performance and aesthetics of the housing. After a long time of use, it is easy for dust to adhere to the housings of many lamps, and the lamps are often suspended at a relatively high position, making it inconvenient to clean. Over time, it will affect the aesthetics of the lamps.

[0004] We urgently need a new material to solve the problem of dust adsorption, which can achieve the antistatic performance of the product without affecting the product function and quality, reduce the glare effect of the reflector, and promote the technological upgrading of various types of lamps such as spotlights, downlights, and grille lamps. It can effectively solve the changing needs of customers and meet the quality of light.

[0005] In view of this, it is necessary to provide a composite polycarbonate material, a preparation method thereof, and a lamp to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a composite polycarbonate material that can have good dust resistance performance.

[0007] To achieve the above purpose, the present invention provides a polycarbonate material applied to lamps. Calculated by weight, its raw materials include the following components:

[0008]

[0009] Optionally, when the melt flow rate of the polycarbonate is 300 °C / 1.2 kg, the melt index range of the polycarbonate is 10 - 15 g / 10 min, and the molecular weight of the polycarbonate is between 22,000 and 25,000 DA.

[0010] Optionally, the concentration of single-walled carbon nanotubes in the carbon nanotube masterbatch is 20%, and the diameter of the single-walled carbon nanotubes is 2 - 25 nm.

[0011] Optionally, the monomer copolymerization ratio of the acrylonitrile-styrene-acrylate copolymer is acrylonitrile:styrene:acrylate = 2:7:1, and the melt index of the acrylonitrile-styrene-acrylate copolymer is 20 - 25 g / 10 min.

[0012] Optionally, the antioxidant includes a hindered phenol antioxidant or a phosphite antioxidant.

[0013] Optionally, the anti-aging aid includes at least one of a benzotriazole anti-aging aid, a hindered phenol anti-aging aid, and a compound phosphite anti-aging aid.

[0014] Optionally, the acid value of the dispersant is 9-16 mg KOH / g.

[0015] Another object of the present invention is to provide a method for preparing the above-mentioned composite polycarbonate material.

[0016] To achieve the above object, the present invention provides a preparation method for preparing the above-mentioned composite polycarbonate material, including:

[0017] Put polycarbonate, acrylonitrile-styrene-acrylate copolymer, carbon nanotube masterbatch, dispersant, antioxidant, and anti-aging aid into a low-speed mixer and stir for 5 minutes to mix evenly to obtain a primary material;

[0018] Extrude and pelletize the primary material with a twin-screw extruder. The processing temperature of the twin-screw extruder is 250-270 °C, the head temperature is 270 °C, and the screw speed is 300 rpm.

[0019] Another object of the present invention is to provide a lamp using the above-mentioned composite polycarbonate material.

[0020] To achieve the above object, the present invention provides a lamp, the lamp includes a housing and / or a reflector, and the housing and / or the reflector are made of the above-mentioned composite polycarbonate material.

[0021] Optionally, the lamp includes one of a downlight, a ceiling lamp, a kitchen and bathroom lamp, a decorative lamp, and a table lamp.

[0022] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: Compared with the housing and / or reflector of a lamp using a traditional polycarbonate material, the housing and / or reflector of a lamp using the composite polycarbonate material of the present invention has a similar glossiness, while the surface resistivity is lower, has a higher antistatic effect, can effectively prevent dust adhesion, and at the same time, also has more excellent photo-oxidative aging performance. Description of the Drawings

[0023] Figure 1 is a flowchart of the preparation method of the present invention.

[0024] Figure 2Figure showing the test comparison in a dusty environment between a reflector made of a composite polycarbonate material and a reflector made of a conventional polycarbonate material in a preferred embodiment of the present invention. Among them Figure 2 (a) is a reflector made of an ordinary polycarbonate material prepared according to Comparative Example 2, Figure 2 (b) is a reflector made of the composite polycarbonate material of the present invention. Detailed implementation manners

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Here, it should be noted that in order to avoid obscuring the present invention due to unnecessary details, only the structures and / or processing steps closely related to the solution of the present invention are shown in the drawings, while other details less related to the present invention are omitted.

[0027] In addition, it should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0028] The technical solutions provided by the present invention will be described in detail below with reference to specific embodiments.

[0029] This embodiment discloses a composite polycarbonate material, which is mainly applied to lamps and reflectors. By weight, the raw materials of this material include the following components:

[0030]

[0031] Among them, polycarbonate is the main raw material of this material. The melt index range of polycarbonate in this embodiment is 10-20 g / 10 min. This melt index is measured under the conditions specified by the national standard, where the temperature is 300 °C, the weight of the heavy object is 1.2 kg, and the molecular weight of polycarbonate is 22,000-25,000 DA.

[0032] Among them, in this embodiment, acrylonitrile-styrene-acrylate copolymer is the main raw material for adjusting the processing fluidity in this material, and has a great influence on the molding of thin-walled large parts and the appearance yield. The monomer copolymerization ratio in acrylonitrile-styrene-acrylate copolymer is acrylonitrile:styrene:acrylate = 2:7:1, and the melt index of acrylonitrile-styrene-acrylate copolymer is 20-25 g / 10 min.

[0033] Among them, the carbon nanotube masterbatch is the only conductive filler in this material to reduce the surface resistivity. The carbon nanotube masterbatch includes single-walled carbon nanotubes with a diameter of 2 - 25 nm, and the concentration of carbon nanotubes in the carbon nanotube masterbatch is 20%.

[0034] In this embodiment, the role of the dispersant is to increase the dispersibility of carbon nanotubes in this material and prevent uneven dispersion caused by agglomeration during the mixing and pelletizing of nanomaterials.

[0035] In this embodiment, the antioxidant includes at least one of hindered phenol antioxidants or phosphite antioxidants, and the antioxidant has the characteristic of high-temperature hydrolysis resistance.

[0036] In this embodiment, the anti-aging aid includes one of benzotriazole anti-aging aids, hindered phenol anti-aging aids, and phosphite compound anti-aging aids.

[0037] The performance of the material provided by the present invention will be further described below through experimental examples and comparative examples.

[0038] Experimental example:

[0039] The raw materials of each experimental example and comparative example are shown in Table 1:

[0040] Table 1 Raw material table

[0041]

[0042] (Note: The lower the surface resistivity of the reflector → the lower the surface brightness value → the better the surface anti-glare effect → the lower the dust adsorption amount)

[0043] Put each component into a low-speed mixer and stir for 5 minutes to mix evenly, then discharge, and then extrude and pelletize with a twin-screw extruder; among them, the processing temperature of the screw extruder is 250 - 270 °C, the specific temperature settings are shown in Table 2, the head temperature is 270 °C, and the screw speed is 300 rpm.

[0044] Table 2 Screw temperature setting values

[0045]

[0046] Perform various performance tests on the pellets formed by each experimental example and comparative example according to national standards, and the test results are shown in Table 3.

[0047] Table 3 Performance test results (Note, the lower the surface resistivity of the reflector → the lower the surface brightness value → the better the surface anti-glare effect → the lower the dust adsorption amount)

[0048] As can be seen from Table 3, the composite polycarbonate materials obtained in Experimental Examples 1-4 exceed the performance of the polycarbonate material prepared in Comparative Example 2 in terms of parameters such as material fluidity and injection molding cycle. At the same time, the fluidity of the composite polycarbonate materials obtained in Experimental Examples 1-4 is significantly higher than that of the existing polycarbonate materials. For products of the same volume, the molding cycle is faster; the surface resistivity of the materials formed in Experimental Examples 1-4 is much lower than that of the polycarbonate material prepared in the existing Comparative Example 2. The lower the resistivity, the better the surface anti-glare effect and the better the dust resistance performance; at the same time, the photo-oxidative aging performance of Experimental Examples 2-3 is also significantly better than that of the polycarbonate materials prepared in Comparative Example 1 and Comparative Example 2, so it has a longer service life.

[0049] In addition, as can be seen from Table 3, although the main raw material polycarbonate used in Comparative Example 1 is the same as that in Experimental Example 3, acrylonitrile-styrene-acrylate is missing in Comparative Example 1. Therefore, the material obtained in Comparative Example 1 has low fluidity and a long processing cycle. Moreover, the anti-aging performance of acrylonitrile-styrene-acrylate is better than that of polycarbonate, so the photo-oxidative aging of Experimental Example 3 is better. It can also be seen that in Experimental Example 4 and Experimental Example 3, the main raw material polycarbonate and ASA used are the same. In Experimental Example 4, conductive carbon black is selected as the conductive agent, and the overall impact strength decreases, and the surface brightness of the reflector is high and the resistivity is high, so the dust resistance performance achieved in Experimental Example 3 using carbon nanotubes as the conductive agent is not reached.

[0050] In summary, the composite polycarbonate material provided by the embodiments of the present invention has an impact strength similar to that of traditional polycarbonate materials, a lower surface resistivity, a better dust adsorption resistance ability, and at the same time has higher fluidity, a faster molding cycle and more excellent photo-oxidative aging performance.

[0051] The composite polycarbonate material provided by the present invention can be applied to the housings and reflectors of lamps, including but not limited to downlights, ceiling lights, kitchen and bathroom lights, decorative lights, table lamps, etc. While significantly reducing the problem of dust adsorption on lamps, it can also significantly reduce the glare problem of lamps. And it should be noted that although the composite polycarbonate material provided in this embodiment is usually applied to the housings and / or reflectors of molded lamps, it does not exclude its application to molded lamp components with other working conditions similar to those of the housings and / or reflectors. Even it can be applied to components with similar working conditions of other electrical products. The present invention does not limit this.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. 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 spirit and scope of the technical solutions of the present invention.

Claims

1. A composite polycarbonate material, which is applied to lamps, is characterized in that, By weight, its raw materials include the following components:

2. The composite polycarbonate material according to claim 1, wherein When the melt flow rate of the polycarbonate is 300 °C / 1.2 kg, the melt index of the polycarbonate ranges from 10 to 15 g / 10 min, and the molecular weight of the polycarbonate is between 22,000 and 25,000 DA.

3. The composite polycarbonate material according to claim 1, wherein The concentration of single-walled carbon nanotubes in the carbon nanotube masterbatch is 20%, and the diameter of the single-walled carbon nanotubes is 2 to 25 nm.

4. The composite polycarbonate material according to claim 1, characterized in that, The monomer copolymerization ratio of the acrylonitrile-styrene-acrylate copolymer is acrylonitrile: styrene: acrylate = 2:7:1, and the melt index of the acrylonitrile-styrene-acrylate copolymer is 20 - 25 g / 10 min.

5. The composite polycarbonate material according to claim 1, characterized in that, The antioxidant includes a hindered phenol antioxidant or a phosphite antioxidant.

6. The composite polycarbonate material according to claim 1, wherein The anti-aging aid includes at least one of benzotriazole anti-aging aids, hindered phenol anti-aging aids, and phosphite compound anti-aging aids.

7. The composite polycarbonate material according to claim 1, characterized in that, The acid value of the dispersant is 9 - 16 mg KOH / g.

8. A preparation method for preparing the composite polycarbonate material according to any one of claims 1 to 7, characterized in that, Including: Put the polycarbonate, acrylonitrile-styrene-acrylate copolymer, carbon nanotube masterbatch, dispersant, antioxidant, and anti-aging aid into a low-speed mixer and stir for 5 minutes to make them evenly mixed to obtain a primary material; Extrude and pelletize the primary material with a twin-screw extruder. The processing temperature of the twin-screw extruder is 250 - 270 °C, the head temperature is 270 °C, and the screw speed is 300 rpm.

9. A lighting fixture, characterized in that, The lamp includes a housing and / or a reflector, and the housing and / or the reflector are made of the composite polycarbonate material according to any one of claims 1 to 7.

10. The luminaire according to claim 9, characterized in that, The lamp includes one of a downlight, a ceiling lamp, a kitchen and bathroom lamp, a decorative lamp, and a table lamp.

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