CN109320839B - Photodiffusion polypropylene composite material for LED - Google Patents

Photodiffusion polypropylene composite material for LED Download PDF

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Publication number
CN109320839B
CN109320839B CN201811058114.6A CN201811058114A CN109320839B CN 109320839 B CN109320839 B CN 109320839B CN 201811058114 A CN201811058114 A CN 201811058114A CN 109320839 B CN109320839 B CN 109320839B
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light
parts
polypropylene
polypropylene composite
diffusant
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CN109320839A (en
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娄小安
孔伟
韩波
陆展科
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Shanghai Sunny Technology Co ltd
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Shanghai Sunny Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10Homopolymers or copolymers of propene
    • C08L23/12Polypropene
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/30Sulfur-, selenium- or tellurium-containing compounds
    • C08K2003/3045Sulfates

Abstract

The invention relates to a photodiffusion polypropylene composite material for LEDs; the composite material comprises the following components in parts by weight: 100 parts of homopolymerized polypropylene, 1-5 parts of organic silicon light diffusant, 1-5 parts of barium sulfate light diffusant, 1-2 parts of light stabilizer and 2-3 parts of chemical modifier. Compared with the prior art, the photodiffusion polypropylene composite material prepared by the invention has excellent mechanical property, and very excellent light transmittance and haze.

Description

Photodiffusion polypropylene composite material for LED
Technical Field
The invention relates to the field of high polymer materials, in particular to a light diffusion polypropylene composite material for an LED.
Background
With the development of LED light sources, light diffusion plates for LEDs are also developed rapidly, the traditional light reflection material is metal die casting or modified PC material, the metal die casting is high in cost and complex in process, and the modified PC material is expensive.
The polypropylene has the characteristics of low density, corrosion resistance, easiness in processing, low cost, recoverability, excellent mechanical property and the like, and is widely applied to industries such as automobiles, household appliances and the like. But no report is made about the application of polypropylene materials in the fields of LED shading and reflection. The polypropylene has certain permeability under the condition of thin wall, so that the polypropylene has a wide prospect for the research on the modification of the light-shielding property of the polypropylene.
The Chinese patent with the application number of 201210519772.7 discloses a light diffusion modified polypropylene material and a preparation method thereof, wherein the light diffusion modified polypropylene material comprises the following components in percentage by weight: 98.5 to 99 percent of polypropylene, 0.3 to 0.8 percent of light diffusant, 0.05 to 0.5 percent of transparent modifier, 0.1 to 0.5 percent of antioxidant and 0.1 to 0.3 percent of light stabilizer, and the polypropylene material with the light diffusion effect is prepared; however, the mechanical properties, transmittance and haze are still not good.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a light diffusion polypropylene composite material for LEDs.
The purpose of the invention can be realized by the following technical scheme:
the invention relates to a light diffusion polypropylene composite material, which comprises the following components in parts by weight:
the melt index of the homopolymerized polypropylene under the test conditions of 230 ℃ and 2.16kg is 10g/10 min. In the system of the invention, if the melt index of the homopolymerized polypropylene is lower than 10g/10min, the viscosity of the material is too high, the coating of the light diffusant is adversely affected, and the light diffusion effect of the material is affected; if the molecular weight is higher than 10g/10min, the number average molecular weight of the material is lower, and agglomeration of the light diffusant is easily caused to influence the dispersion effect, so that the light diffusion effect is influenced.
Preferably, the silicone light diffusing agent has an average particle diameter of 1 to 5 μm and a refractive index of 1.43.
Preferably, the barium sulfate light diffusant is synthetic barium sulfate and has a spherical structure, the particle size is 2-6 mu m, and the refractive index is 1.63. According to the invention, the light diffusion effect and the light transmittance are improved by adding the silicone light diffusing agent and the spherical barium sulfate for compounding, the refractive index of polypropylene is 1.54, different refractive index differences among materials are achieved by compounding 1.43 silicone and 1.63 synthetic barium sulfate, the problem of better light penetrating through resin can be well solved in a synergistic manner, and the transmittance and the diffusion effect are achieved.
Preferably, the light stabilizer is a hindered amine light stabilizer.
Preferably, the chemical modifier is maleic anhydride modified polypropylene, the number average molecular weight is 15000-20000, and the viscosity is 400-600 mPa.s. The low molecular weight modified polypropylene with the number average molecular weight of 15000-20000 viscosity of 400-600mPa.s is selected, so that the combination with the light diffusant is more favorable for improving the dispersion effect; when the molecular weight is less than 15000, the material has large melt index, and the intermolecular van der Waals force is weakened, so that the light diffusant is easy to agglomerate; when the molecular weight is greater than 20000, the viscosity of the chemical modifier itself is too high, which makes it difficult for the maleic anhydride end groups to effectively contact and react with the surface groups of the light diffuser, and also makes it difficult for the light diffuser to be stably dispersed in the PP matrix.
In a second aspect, the present invention relates to a method for preparing the above-mentioned photodiffusion polypropylene composite material, comprising the steps of:
s1, preparing materials according to the components and the parts by weight; putting the mixture into a high-speed mixer for mixing for 2-5 min, and discharging;
s2, putting the mixed raw materials into a double-screw machine for extrusion granulation, wherein the rotating speed of the double-screw machine is 200-400 r/min, and the temperature is 180-220 ℃, so as to prepare the light diffusion polypropylene composite material for the LED.
Compared with the prior art, the invention has the following beneficial effects:
(1) the prepared photodiffusion polypropylene composite material for the LED achieves excellent light transmittance by using the homopolymerized polypropylene with the melt index of 10g/10min (230 ℃ 2.16kg), and the homopolymerized polypropylene material can have excellent light transmittance due to high crystallinity and fine crystal nucleus; meanwhile, the material using 10g/10min molten finger can obtain better processability, excellent impact property and more excellent coating property on the light diffusant powder.
(2) The light diffusion effect and the light transmittance are improved by adding the silicone light diffusing agent and the spherical barium sulfate, the refractive index of polypropylene is 1.54, different refractive index differences among materials are achieved by compounding 1.43 silicone and 1.63 synthetic barium sulfate, the problem that light penetrates through resin better in a good synergistic mode can be solved, and the transmittance and the diffusion effect are achieved.
(3) The stable dispersion of the light diffusant can be effectively improved by adding the maleic anhydride modified polypropylene chemical modifier with the molecular weight of 15000-20000 and the viscosity of 400-600 mPa.s.
(4) The prepared product has smooth surface, good light diffusivity, excellent light transmittance, beautiful appearance and low cost.
Detailed Description
The present invention will be described in detail with reference to examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be apparent to those skilled in the art that several modifications and improvements can be made without departing from the inventive concept. All falling within the scope of the present invention.
Example 1
The embodiment relates to a photodiffusion polypropylene composite material for LEDs, which is prepared from the following components in parts by weight:
all the raw materials are put into a high-speed mixer together to be mixed for 2-5 min, and then the materials are discharged; and then putting the mixture into a double-screw extruder for extrusion granulation to prepare the photodiffusion polypropylene composite material for the LED. Wherein the process temperature is 200 ℃, and the screw rotating speed is 400 r/min.
Example 2
The embodiment relates to a photodiffusion polypropylene composite material for LEDs, which is prepared from the following components in percentage by weight:
all the raw materials are put into a high-speed mixer together to be mixed for 2-5 min, and then the materials are discharged; and then putting the mixture into a double-screw extruder for extrusion granulation to prepare the photodiffusion polypropylene composite material for the LED. Wherein the process temperature is 190 ℃, and the screw rotating speed is 300 r/min.
Example 3
The embodiment relates to a photodiffusion polypropylene composite material for LEDs, which is prepared from the following components in percentage by weight:
all the raw materials are put into a high-speed mixer together to be mixed for 2-5 min, and then the materials are discharged; and then putting the mixture into a double-screw extruder for extrusion granulation to prepare the photodiffusion polypropylene composite material for the LED. Wherein the process temperature is 180 ℃, and the screw rotating speed is 350 r/min.
Comparative example 1
The comparative example relates to a photodiffusion polypropylene composite material for LEDs, which is basically the same as example 1 in components and parts by weight, except that: does not contain a synthetic barium sulfate light diffusant.
All the raw materials are put into a high-speed mixer together to be mixed for 2-5 min, and then the materials are discharged; and then putting the mixture into a double-screw extruder for extrusion granulation to prepare the polypropylene composite material. Wherein the process temperature is 200 ℃, and the screw rotating speed is 400 r/min.
Comparative example 2
The comparative example relates to a photodiffusion polypropylene composite material for LEDs, which is basically the same as example 1 in components and parts by weight, except that: the synthetic barium sulfate with the refractive index of 1.63 is replaced by silica with the refractive index of 1.6.
All the raw materials are put into a high-speed mixer together to be mixed for 2-5 min, and then the materials are discharged; and then putting the mixture into a double-screw extruder for extrusion granulation to prepare the polypropylene composite material. Wherein the process temperature is 200 ℃, and the screw rotating speed is 400 r/min.
Comparative example 3
The comparative example relates to a photodiffusion polypropylene composite material for LEDs, which is basically the same as example 1 in components and parts by weight, except that: the viscosity of the adopted chemical modifier, namely maleic anhydride modified polypropylene, is 800 mPa.s.
All the raw materials are put into a high-speed mixer together to be mixed for 2-5 min, and then the materials are discharged; and then putting the mixture into a double-screw extruder for extrusion granulation to prepare the polypropylene composite material. Wherein the process temperature is 200 ℃, and the screw rotating speed is 400 r/min.
Comparative example 4
The comparative example relates to a photodiffusion polypropylene composite material for LEDs, which is basically the same as example 1 in components and parts by weight, except that: the viscosity of the adopted chemical modifier, namely maleic anhydride modified polypropylene, is 300 mPa.s.
All the raw materials are put into a high-speed mixer together to be mixed for 2-5 min, and then the materials are discharged; and then putting the mixture into a double-screw extruder for extrusion granulation to prepare the polypropylene composite material. Wherein the process temperature is 200 ℃, and the screw rotating speed is 400 r/min.
Comparative example 5
The comparative example relates to a photodiffusion polypropylene composite material for LEDs, which is basically the same as example 1 in components and parts by weight, except that:
homo-polypropylene with a melt index of 9g/10min was used. All the raw materials are put into a high-speed mixer together to be mixed for 2-5 min, and then the materials are discharged; and then putting the mixture into a double-screw extruder for extrusion granulation to prepare the polypropylene composite material. Wherein the process temperature is 200 ℃, and the screw rotating speed is 400 r/min.
Comparative example 6
The comparative example relates to a photodiffusion polypropylene composite material for LEDs, which is basically the same as example 1 in components and parts by weight, except that:
homo-polypropylene with a melt index of 11g/10min was used. All the raw materials are put into a high-speed mixer together to be mixed for 2-5 min, and then the materials are discharged; and then putting the mixture into a double-screw extruder for extrusion granulation to prepare the polypropylene composite material. Wherein the process temperature is 200 ℃, and the screw rotating speed is 400 r/min.
Incidentally, the melt index of the homo-polypropylene described in examples 1 to 3 was 10g/10min (230 ℃ C. and 2.16 kg). The average grain diameter of the organic silicon light diffusant is 1-5 mu m, and the refractive index is 1.43. The synthetic barium sulfate has a spherical structure, a particle size of 2-6 mu m and a refractive index of 1.63. The light stabilizer is a hindered amine light stabilizer. The chemical modifier is maleic anhydride modified polypropylene, the molecular weight is 15000-20000, and the viscosity is 400-600 mPa.s.
Performance test of examples 1 to 3 and comparative examples 1 to 6
The polypropylene composite materials prepared in examples 1-3 and comparative examples 1-6 were subjected to optical property test, and the composite materials were injection molded into 2mm thick polished plaques, the 2mm thick polished plaques were tested for light transmittance and haze, the light transmittance and haze were tested in accordance with GB/T2410-2008, and the reflectance was tested using a D65 light source at an incident angle of 10 °.
TABLE 1 mechanical Properties of examples 1-3 and comparative examples 1-6
As can be seen from Table 1, the polypropylene composite materials prepared in examples 1-3 have excellent light transmittance and haze, and can be widely applied to the field of lamp diffusion covers.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and additions can be made without departing from the method of the present invention, and these modifications and additions should also be regarded as the protection scope of the present invention.

Claims (3)

1. The light diffusion polypropylene composite material is characterized by comprising the following components in parts by weight:
100 parts of homopolymerized polypropylene, namely 100 parts of homopolymerized polypropylene,
1-5 parts of organic silicon light diffusant,
1-5 parts of barium sulfate light diffusant,
1-2 parts of a light stabilizer, namely,
2-3 parts of a chemical modifier;
the melt index of the homopolymerized polypropylene is 10g/10min under the test conditions of 230 ℃ and 2.16 kg;
the average grain diameter of the organic silicon light diffusant is 1-5 mu m, and the refractive index is 1.43;
the barium sulfate light diffusant is synthetic barium sulfate and has a spherical structure, the particle size is 2-6 mu m, and the refractive index is 1.63;
the chemical modifier is maleic anhydride modified polypropylene, the molecular weight is 15000-20000, and the viscosity is 400-600 mPa.s.
2. The light diffusing polypropylene composite according to claim 1, wherein the light stabilizer is a hindered amine light stabilizer.
3. A method for preparing a light diffusing polypropylene composite material according to claim 1 or 2, comprising the steps of:
s1, preparing materials according to the components and the parts by weight; putting the mixture into a high-speed mixer for mixing for 2-5 min, and discharging;
s2, putting the mixed raw materials into a double-screw machine for extrusion granulation, wherein the rotating speed of the double-screw machine is 200-400 r/min, and the temperature is 180-220 ℃, so as to prepare the light diffusion polypropylene composite material.
CN201811058114.6A 2018-09-11 2018-09-11 Photodiffusion polypropylene composite material for LED Active CN109320839B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103012966A (en) * 2012-12-06 2013-04-03 上海日之升新技术发展有限公司 Photodiffusion modified polypropylene material and preparation method thereof
CN103013087A (en) * 2012-12-28 2013-04-03 大河宝利材料科技(苏州)有限公司 Special flame-retardant light diffuser grade polycarbonate composition for LED (light-emitting diode) and preparation method thereof
CN105001510A (en) * 2015-07-02 2015-10-28 广州科苑新型材料有限公司 Low temperature resistant halogen-free flame-retardant light scattering polypropylene composition and preparation method thereof
CN108239330A (en) * 2016-12-27 2018-07-03 上海凯波特种电缆料厂有限公司 A kind of automotive line irradiated crosslinking low-smoke and halogen-free flame retardant material and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103012966A (en) * 2012-12-06 2013-04-03 上海日之升新技术发展有限公司 Photodiffusion modified polypropylene material and preparation method thereof
CN103013087A (en) * 2012-12-28 2013-04-03 大河宝利材料科技(苏州)有限公司 Special flame-retardant light diffuser grade polycarbonate composition for LED (light-emitting diode) and preparation method thereof
CN105001510A (en) * 2015-07-02 2015-10-28 广州科苑新型材料有限公司 Low temperature resistant halogen-free flame-retardant light scattering polypropylene composition and preparation method thereof
CN108239330A (en) * 2016-12-27 2018-07-03 上海凯波特种电缆料厂有限公司 A kind of automotive line irradiated crosslinking low-smoke and halogen-free flame retardant material and preparation method thereof

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