CN113088058A - Polycarbonate-based light diffusion material for automobile lamp shade and preparation method thereof - Google Patents
Polycarbonate-based light diffusion material for automobile lamp shade and preparation method thereof Download PDFInfo
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- CN113088058A CN113088058A CN201911335422.3A CN201911335422A CN113088058A CN 113088058 A CN113088058 A CN 113088058A CN 201911335422 A CN201911335422 A CN 201911335422A CN 113088058 A CN113088058 A CN 113088058A
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- polycarbonate
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- polyarylate
- diffusion material
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- 229920000515 polycarbonate Polymers 0.000 title claims abstract description 54
- 239000004417 polycarbonate Substances 0.000 title claims abstract description 54
- 238000009792 diffusion process Methods 0.000 title claims abstract description 42
- 239000000463 material Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 229920001230 polyarylate Polymers 0.000 claims abstract description 33
- 239000011258 core-shell material Substances 0.000 claims abstract description 18
- 229920001577 copolymer Polymers 0.000 claims abstract description 17
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 16
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 16
- 239000006097 ultraviolet radiation absorber Substances 0.000 claims abstract description 11
- 239000000654 additive Substances 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract 2
- 230000004580 weight loss Effects 0.000 claims description 40
- 239000008187 granular material Substances 0.000 claims description 30
- 239000002245 particle Substances 0.000 claims description 25
- 238000002156 mixing Methods 0.000 claims description 22
- 239000000843 powder Substances 0.000 claims description 20
- 239000004611 light stabiliser Substances 0.000 claims description 11
- 239000004925 Acrylic resin Substances 0.000 claims description 10
- 229920000178 Acrylic resin Polymers 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 10
- -1 polyphenol amine compound Chemical class 0.000 claims description 10
- 235000013824 polyphenols Nutrition 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 10
- 230000002745 absorbent Effects 0.000 claims description 9
- 239000002250 absorbent Substances 0.000 claims description 9
- 229940124543 ultraviolet light absorber Drugs 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- GXURZKWLMYOCDX-UHFFFAOYSA-N 2,2-bis(hydroxymethyl)propane-1,3-diol;dihydroxyphosphanyl dihydrogen phosphite Chemical compound OP(O)OP(O)O.OCC(CO)(CO)CO GXURZKWLMYOCDX-UHFFFAOYSA-N 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 150000001412 amines Chemical class 0.000 claims description 3
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 229920002545 silicone oil Polymers 0.000 claims description 3
- 229920000402 bisphenol A polycarbonate polymer Polymers 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000002834 transmittance Methods 0.000 abstract description 14
- 208000016261 weight loss Diseases 0.000 description 36
- 238000005469 granulation Methods 0.000 description 9
- 230000003179 granulation Effects 0.000 description 9
- 238000000149 argon plasma sintering Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 239000010954 inorganic particle Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229920000620 organic polymer Polymers 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- AMTWCFIAVKBGOD-UHFFFAOYSA-N dioxosilane;methoxy-dimethyl-trimethylsilyloxysilane Chemical compound O=[Si]=O.CO[Si](C)(C)O[Si](C)(C)C AMTWCFIAVKBGOD-UHFFFAOYSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- ADFPJHOAARPYLP-UHFFFAOYSA-N methyl 2-methylprop-2-enoate;styrene Chemical compound COC(=O)C(C)=C.C=CC1=CC=CC=C1 ADFPJHOAARPYLP-UHFFFAOYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011146 organic particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000010094 polymer processing Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229940083037 simethicone Drugs 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
- F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
- F21V3/06—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material
- F21V3/062—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material being plastics
- F21V3/0625—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material being plastics the material diffusing light, e.g. translucent plastics
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
- F21W2102/10—Arrangement or contour of the emitted light
- F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a polycarbonate-based light diffusion material for an automobile lamp shade and a preparation method thereof, wherein the composition comprises the following components in parts by weight: polycarbonate (C): 100 parts, light diffusing agent: 0.5-5 parts of antioxidant: 0.1-0.5 parts of ultraviolet absorber: 0.1-0.5 part, and other additives: 0 to 5 parts. The invention uses polyarylate and polyarylate core-shell copolymer as light diffusant, and the prepared light diffusion polycarbonate material has both transmittance and haze, good light stability and controllable light diffusion direction.
Description
Technical Field
The invention belongs to the field of polymer processing technology application, and particularly relates to a polycarbonate-based light diffusion material for an automobile lamp shade and a preparation method thereof.
Background
With the progress of automobile safety and light weight, the polycarbonate material is more and more widely applied in the automobile industry, and the unique excellent optical performance, good mechanical property, insulativity, flame retardance, certain ageing resistance and the like of the polycarbonate material ensure that the polycarbonate material is widely applied to an automobile lighting system.
The permeability of the LED in the automobile lamp is continuously improved by virtue of the advantages of long service life, low energy consumption, small light source volume, relatively economic cost and the like. However, the LED lamp itself is a point light source, and has problems of glare, limited illumination area, and the like. The polycarbonate-based light diffusion material can effectively diffuse light while allowing the light to pass through, has excellent transmittance and haze, effectively improves the illumination area, and can reduce the damage of light sources to human eyes. The preparation method of the light diffusion material is generally divided into two methods, namely a polymerization method and a blending method. The blending method has simple process and lower cost, can realize continuous production for production with large dosage, and has higher production efficiency, thereby being widely applied. The light scattering particles are classified into inorganic particles and organic particles, and the commonly used light diffusing agents include inorganic particles such as glass, silica, calcium carbonate, titanium dioxide, mica, talc, and barium sulfate, and the organic scattering particles include polymethyl methacrylate (PMMA), Polystyrene (PS), acrylic resin, silicone resin, and methyl methacrylate-styrene crosslinked copolymer microspheres.
In the prior art, inorganic scatterer particles have poor compatibility with a matrix material, and have high hardness, so that equipment is abraded and has poor light stability; the organic scatterer particles have good compatibility with the matrix, but the conventional organic polymer improves the haze of the material, reduces the light transmittance of the material and has isotropy of a light source. CN102702713A discloses a light scattering polycarbonate compound and a light diffusion material (film, sheet, plate) prepared therefrom, which are regulated and controlled by a molding processing manner to prepare isotropic and anisotropic light diffusion materials.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the polycarbonate-based light diffusion material for the automobile lamp cover has the advantages of simple production process, safety, reliability, good light transmittance and haze, good light stability and controllable light diffusion direction.
In order to achieve the above objects, the inventors of the present invention conducted numerous exploratory tests and intensive studies to provide a polycarbonate-based light diffusion material for an automobile lamp cover, which comprises the following components in parts by weight: polycarbonate (C): 100 parts, light diffusing agent: 0.5-5 parts of antioxidant: 0.1-0.5 parts of ultraviolet absorber: 0.1-0.5 part, and other additives: 0-5 parts; preferably: polycarbonate (C): 100 parts, light diffusing agent: 0.5-3 parts of antioxidant: 0.01-0.2 parts of ultraviolet absorber: 0.01-0.2 parts of other additives: 0 to 3 parts.
Further, the polycarbonate is bisphenol A polycarbonate, and the melt index is 3-40 g/10min under the condition of 300 ℃/1.2kg, preferably 5-25 g/10 min; the mass-average molecular weight is 15000 to 100000, preferably 20000 to 80000.
The light diffusion agent is one or more of acrylic resin, polyarylate and polyarylate core-shell copolymer particles, and the particle diameter is 1-10 microns, preferably 1-5 microns.
Further, the polyarylate core-shell copolymer is a core-shell structure of grafted polyarylate coated acrylate, and the weight ratio of the acrylate to the shell grafted polyarylate is 20: 80-90: 10, preferably 40: 60-70: 30.
further, the antioxidant is one or more of a polyphenol amine compound, dioctadecyl alcohol pentaerythritol diphosphite and an antioxidant B900, and the polyphenol amine compound and the antioxidant B900 are preferred.
Further, the ultraviolet light absorber is one or more of hindered amine light stabilizer 622, ultraviolet light absorber LL26 and ultraviolet light absorber LL28, and preferably a compound of hindered amine light stabilizer 622 and ultraviolet light absorber LL 28.
Further, the other additive is one or more of methyl silicone oil, dimethyl silicone oil and white oil, and white oil and methyl silicone oil are preferred.
The invention also provides a preparation method of the polycarbonate-based light diffusion material for the automobile lamp shade, which comprises the following specific steps:
(1) adding the dried polycarbonate substrate into a granule weight loss type feeder;
(2) adding the dried light diffusant, the antioxidant, the ultraviolet absorbent and other additives into a powder weight loss type feeder, and uniformly mixing at a high speed;
(3) all the raw materials are added into a double-screw extruder through a granule weight loss type feeder and a powder weight loss type feeder, and the polycarbonate-based light diffusion granules are prepared through melt blending, extrusion, water cooling, air cooling and granulation.
Further, the length-diameter ratio of the double-screw extruder is 35: 1-42: 1, the diameter of the screw is 16-22 mm, the temperature is 220-320 ℃, and the rotating speed is 250-400 rpm.
The invention selects and adds organic polymer into polycarbonate base material to prepare polycarbonate base photodiffusion material with transparency, haze, good light stability and controllable photodiffusion direction. Multiple tests and intensive research show that the light scattering body particles are one or more of acrylic resin, polyarylate and polyarylate core-shell copolymer, the light stability of the material can be improved by adding polyarylate or polyarylate core-shell copolymer, and the polycarbonate-based light diffusion material for different automobile lampshades can be obtained by adjusting the types and the addition amount of the polyarylate or polyarylate core-shell copolymer.
Compared with the prior art, the light diffusion polycarbonate material prepared by using the polyarylate and the polyarylate core-shell copolymer as the light diffuser has the advantages of light transmittance, haze, good light stability and controllable light diffusion direction.
Detailed Description
Example 1
Adding 3kg of the dried polycarbonate substrate (melt index of 8 g/10min, mass average molecular weight of 28000) into a granule weight loss feeder; adding 40 g of dried polyarylate particles, 20 g of polyarylate core-shell copolymer particles, 4 g of dioctadecyl alcohol pentaerythritol diphosphite, 2 g of polyphenol amine compound, 6229 g of light stabilizer and 30g of white oil into a powder weight loss type feeder, and uniformly mixing at high speed;
the length-diameter ratio of the double-screw extruder is 40: 1, the diameter of a screw is 20 mm, the temperature of the screw is 230-290 ℃, the rotating speed is 280 rpm, all raw materials are added into a double-screw extruder through a granule weight loss type feeder and a powder weight loss type feeder, and the polycarbonate-based light diffusion granules are prepared through melt blending, extrusion granulation, and the performances of the prepared polycarbonate-based light diffusion granules are as follows: transmittance of 80%, haze of 95%, tensile strength of 68 MPa, tensile strain at break of 95%, and notched impact strength of 27 kJ/m2Light treatment (UV 340 nm, irradiation intensity 0.55W/m)2The color difference value after an irradiation time of 168 h) was 2.
Example 2
Adding 3kg of the dried polycarbonate substrate (melt index 10 g/10min, mass average molecular weight 25000) into a granule weight loss type feeder; adding 20 g of dried polyarylate particles, 30g of polyarylate core-shell copolymer particles, 40 g of acrylic resin particles, 9004.5 g of antioxidant B, 6226 g of light stabilizer, 266 g of ultraviolet absorbent LL and 15 g of white oil into a powder weight loss type feeder, and uniformly mixing at high speed;
the length-diameter ratio of the double-screw extruder is 36: 1, adding all the raw materials into a double-screw extruder through a granule weight-loss type feeder and a powder weight-loss type feeder, and carrying out melt blending, extrusion granulation to obtain the polycarbonate-based light diffusion granules with the following properties: transmittance 82%, haze 96%, tensile Strength 67MPa, tensile strain at break of 105%, notched impact strength of 24 kJ/m2The color difference value after the light treatment was 3.
Example 3
Adding 3kg of the dried polycarbonate substrate (melt index 12 g/10min, mass average molecular weight 22300) into a pellet weight loss feeder; adding 60 g of dried polyarylate core-shell copolymer particles, 15 g of acrylic resin particles, 5 g of polyphenol amine compound, 9002.5 g of antioxidant B, 6223 g of light stabilizer and 283 g of ultraviolet absorbent LL into a powder weight-loss feeder, and uniformly mixing at high speed;
the length-diameter ratio of the double-screw extruder is 38: 1, adding all the raw materials into a double-screw extruder through a granule weight-loss type feeder and a powder weight-loss type feeder, and carrying out melt blending, extrusion granulation to obtain the polycarbonate-based light diffusion granules with the following properties: transmittance of 84 percent, haze of 92 percent, tensile strength of 62 MPa, tensile strain at break of 110 percent and notch impact strength of 22 kJ/m2The color difference value after the light treatment was 3.5.
Example 4
Adding 3kg of the dried polycarbonate substrate (melt index of 10.5 g/10min, mass average molecular weight of 2450) into a granule weight loss type feeder; adding 20 g of dried polyarylate particles, 20 g of polyarylate core-shell copolymer particles, 5 g of acrylic resin particles, 4 g of dioctadecyl alcohol pentaerythritol diphosphite, 2 g of polyphenol amine compound, 62215 g of light stabilizer, 2615 g of ultraviolet absorbent and 24 g of methyl silicone oil into a powder weight loss feeder, and uniformly mixing at high speed;
the length-diameter ratio of the double-screw extruder is 40: 1, adding all the raw materials into a double-screw extruder through a granule weight-loss feeder and a powder weight-loss feeder, and carrying out melt blending, extrusion granulation to obtain the polycarbonate-based light diffusion granules with the following properties: transmittance of 89%, haze of 90%, tensile strength of 65 MPa, tensile strain at break of 96%, and notch impact strength of 25 kJ/m2Light treatment (UV 340 nm, irradiation intensity 0.55W/m)2After an irradiation time of 168 h)The difference was 1.5.
Example 5
Adding 3kg of the dried polycarbonate substrate (melt index of 10 g/10min, mass average molecular weight of 25200) into a granule weight loss type feeder; adding 50 g of dried polyarylate particles, 40 g of polyarylate core-shell copolymer particles, 3g of polyphenol amine compound, 9006 g of antioxidant, 62230 g of light stabilizer, 2815 g of ultraviolet absorbent and 30g of dimethyl silicone oil into a powder weight-loss feeder, and uniformly mixing at high speed;
the length-diameter ratio of the double-screw extruder is 38: 1, adding all the raw materials into a double-screw extruder through a granule weight-loss type feeder and a powder weight-loss type feeder, and carrying out melt blending, extrusion granulation to obtain the polycarbonate-based light diffusion granules with the following properties: transmittance of 86%, haze of 98%, tensile strength of 70 MPa, tensile strain at break of 102%, and notched impact strength of 29 kJ/m2The color difference value after the light treatment was 1.
Example 6
Adding 3kg of the dried polycarbonate substrate (the melt index is 15 g/10min, the mass average molecular weight is 20600) into a granule weight loss type feeder; adding 40 g of dried polyarylate particles, 20 g of polyarylate core-shell copolymer particles, 30g of acrylic resin particles, 3g of polyphenol amine compound, 9003 g of antioxidant, 62215 g of light stabilizer, LL 2815 g of ultraviolet absorbent and 30g of white oil into a powder weight loss type feeder, and uniformly mixing at high speed;
the length-diameter ratio of the double-screw extruder is 41: 1, adding all the raw materials into a double-screw extruder through a granule weight-loss type feeder and a powder weight-loss type feeder, and carrying out melt blending, extrusion granulation to obtain the polycarbonate-based light diffusion granules with the following properties: transmittance of 88%, haze of 97%, tensile strength of 69 MPa, tensile strain at break of 113%, and notched impact strength of 26 kJ/m2The color difference value after the light treatment was 2.1.
Example 7 (comparative example 4)
Adding 3kg of the dried polycarbonate substrate (melt index of 10.5 g/10min, mass average molecular weight of 2450) into a granule weight loss type feeder; adding 45 g of dried acrylic resin particles, 4 g of dioctadecyl alcohol pentaerythritol diphosphite, 2 g of polyphenol amine compound, 62215 g of light stabilizer, 2615 g of ultraviolet absorbent and 24 g of methyl silicone oil into a powder weight loss type feeder, and uniformly mixing at high speed;
the length-diameter ratio of the double-screw extruder is 40: 1, adding all the raw materials into a double-screw extruder through a granule weight-loss feeder and a powder weight-loss feeder, and carrying out melt blending, extrusion granulation to obtain the polycarbonate-based light diffusion granules with the following properties: transmittance of 92%, haze of 83%, tensile strength of 61 MPa, tensile strain at break of 96%, and notched impact strength of 25 kJ/m2Light treatment (UV 340 nm, irradiation intensity 0.55W/m)2The color difference value after an irradiation time of 168 h) was 1.9.
Example 8 (comparative example 5)
Adding 3kg of the dried polycarbonate substrate (melt index of 10 g/10min, mass average molecular weight of 25200) into a granule weight loss type feeder; adding 90 g of dried acrylic resin, 3g of polyphenol amine compound, 9006 g of antioxidant, 62230 g of light stabilizer, LL 2815 g of ultraviolet absorbent and 30g of simethicone into a powder weight-loss type feeder, and uniformly mixing at high speed;
the length-diameter ratio of the double-screw extruder is 38: 1, adding all the raw materials into a double-screw extruder through a granule weight-loss type feeder and a powder weight-loss type feeder, and carrying out melt blending, extrusion granulation to obtain the polycarbonate-based light diffusion granules with the following properties: transmittance of 89%, haze of 90%, tensile strength of 63 MPa, tensile strain at break of 98%, and notched impact strength of 26 kJ/m2The color difference value after the light treatment was 1.4.
As can be seen from the above examples, the light diffusion polycarbonate material prepared by using the polyarylate and polyarylate core-shell copolymer as the light diffuser has both transmittance and haze, and has good light stability and controllable light diffusion direction.
Claims (10)
1. A polycarbonate-based light diffusion material for an automotive lamp cover, characterized in that: the composition comprises the following components in parts by weight:
polycarbonate (C): 100 portions of
Light diffusing agent: 0.5 to 5 portions
Antioxidant: 0.01 to 0.5 portion
Ultraviolet light absorber: 0.01 to 0.5 portion
Other additives: 0 to 5 parts.
2. The polycarbonate-based light diffusion material for an automobile lamp cover according to claim 1, wherein: the polycarbonate is bisphenol A polycarbonate, and the melt index is 3-40 g/10min, preferably 5-25 g/10min under the condition of 300 ℃/1.2 kg; the mass-average molecular weight is 15000 to 100000, preferably 20000 to 80000.
3. The polycarbonate-based light diffusion material for an automobile lamp cover according to claim 1, wherein: the light diffusion agent is one or more of acrylic resin, polyarylate and polyarylate core-shell copolymer particles.
4. The polycarbonate-based light diffusion material for an automobile lamp cover according to claim 3, wherein: the particle size of the light diffusion agent is 1-10 mu m, and preferably 1-5 mu m.
5. The polycarbonate-based light diffusion material for an automobile lamp cover according to claim 3, wherein: the polyarylate core-shell copolymer is a core-shell structure of grafted polyarylate coated acrylate, and the weight ratio of the acrylate to the shell grafted polyarylate is 20: 80-90: 10, preferably 40: 60-70: 30.
6. the polycarbonate-based light diffusion material for an automobile lamp cover according to claim 1, wherein: the antioxidant is one or more of a polyphenol amine compound, dioctadecyl alcohol pentaerythritol diphosphite and an antioxidant B900.
7. The polycarbonate-based light diffusion material for an automobile lamp cover according to claim 1, wherein: the ultraviolet light absorber is one or more of hindered amine light stabilizer 622, ultraviolet light absorber LL26 and ultraviolet light absorber LL 28.
8. The polycarbonate-based light diffusion material for an automobile lamp cover according to claim 1, wherein: the other additives are one or more of methyl silicone oil, dimethyl silicone oil and white oil.
9. A preparation method of a polycarbonate-based light diffusion material for an automobile lampshade is characterized by comprising the following steps:
step S1, adding the dried polycarbonate substrate into a granule weight loss type feeder;
step S2, adding the dried light diffusant, the antioxidant, the ultraviolet light absorbent and other additives into a powder weight loss type feeder, and uniformly mixing at a high speed;
and step S3, adding all the raw materials into a double-screw extruder through a granule weight loss type feeder and a powder weight loss type feeder, and carrying out melt blending, extrusion, water cooling, air cooling and grain cutting to obtain the polycarbonate-based light diffusion granules.
10. The method of claim 10, wherein the twin-screw extruder has a length to diameter ratio of 35: 1-42: 1, the diameter of the screw is 16-22 mm, the temperature is 220-320 ℃, and the rotating speed is 250-400 rpm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115975102A (en) * | 2022-10-25 | 2023-04-18 | 复旦大学 | Polymethacrylate microsphere, preparation method and application thereof |
Citations (15)
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