CN116987367A - Polyester composition and preparation method and application thereof - Google Patents
Polyester composition and preparation method and application thereof Download PDFInfo
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- CN116987367A CN116987367A CN202310461566.3A CN202310461566A CN116987367A CN 116987367 A CN116987367 A CN 116987367A CN 202310461566 A CN202310461566 A CN 202310461566A CN 116987367 A CN116987367 A CN 116987367A
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- 239000000203 mixture Substances 0.000 title claims abstract description 41
- 229920000728 polyester Polymers 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims description 8
- 239000003365 glass fiber Substances 0.000 claims abstract description 30
- 239000011521 glass Substances 0.000 claims abstract description 22
- 239000000835 fiber Substances 0.000 claims abstract description 14
- 239000005357 flat glass Substances 0.000 claims abstract description 14
- 239000000945 filler Substances 0.000 claims abstract description 12
- 239000011347 resin Substances 0.000 claims abstract description 11
- 229920005989 resin Polymers 0.000 claims abstract description 11
- 239000002270 dispersing agent Substances 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 8
- 229920001225 polyester resin Polymers 0.000 claims abstract description 4
- 239000004645 polyester resin Substances 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 239000000314 lubricant Substances 0.000 claims description 9
- 125000004432 carbon atom Chemical group C* 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 239000003963 antioxidant agent Substances 0.000 claims description 3
- 230000003078 antioxidant effect Effects 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000005469 granulation Methods 0.000 claims description 3
- 230000003179 granulation Effects 0.000 claims description 3
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 125000003118 aryl group Chemical group 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 2
- 238000000113 differential scanning calorimetry Methods 0.000 claims description 2
- 125000004185 ester group Chemical group 0.000 claims description 2
- 125000005843 halogen group Chemical group 0.000 claims description 2
- 125000000623 heterocyclic group Chemical group 0.000 claims description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 2
- 239000012752 auxiliary agent Substances 0.000 claims 1
- 238000002834 transmittance Methods 0.000 abstract description 18
- 238000002310 reflectometry Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 14
- 238000012360 testing method Methods 0.000 description 10
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 7
- 239000011324 bead Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 235000014113 dietary fatty acids Nutrition 0.000 description 5
- 239000000194 fatty acid Substances 0.000 description 5
- 229930195729 fatty acid Natural products 0.000 description 5
- 235000010215 titanium dioxide Nutrition 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 150000004665 fatty acids Chemical class 0.000 description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- -1 n-octylsulfanyl Chemical group 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 2
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000001579 optical reflectometry Methods 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OJCIQAXLZMIWQT-UHFFFAOYSA-N 2,5-ditert-butyl-4-[(dimethylamino)methyl]phenol Chemical compound CN(C)CC1=CC(C(C)(C)C)=C(O)C=C1C(C)(C)C OJCIQAXLZMIWQT-UHFFFAOYSA-N 0.000 description 1
- HNURKXXMYARGAY-UHFFFAOYSA-N 2,6-Di-tert-butyl-4-hydroxymethylphenol Chemical compound CC(C)(C)C1=CC(CO)=CC(C(C)(C)C)=C1O HNURKXXMYARGAY-UHFFFAOYSA-N 0.000 description 1
- KSJNLHWGUSIAIF-UHFFFAOYSA-N 2-[2-[2-[3-(4-hydroxy-3,5-dimethylphenyl)propanoyloxy]ethoxy]ethoxy]ethyl 3-(4-hydroxy-3,5-dimethylphenyl)propanoate Chemical compound CC1=C(O)C(C)=CC(CCC(=O)OCCOCCOCCOC(=O)CCC=2C=C(C)C(O)=C(C)C=2)=C1 KSJNLHWGUSIAIF-UHFFFAOYSA-N 0.000 description 1
- WPMYUUITDBHVQZ-UHFFFAOYSA-M 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=CC(CCC([O-])=O)=CC(C(C)(C)C)=C1O WPMYUUITDBHVQZ-UHFFFAOYSA-M 0.000 description 1
- VSAWBBYYMBQKIK-UHFFFAOYSA-N 4-[[3,5-bis[(3,5-ditert-butyl-4-hydroxyphenyl)methyl]-2,4,6-trimethylphenyl]methyl]-2,6-ditert-butylphenol Chemical compound CC1=C(CC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)C(C)=C(CC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)C(C)=C1CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 VSAWBBYYMBQKIK-UHFFFAOYSA-N 0.000 description 1
- XBXODRAZJJCJAR-UHFFFAOYSA-N C(CCCCCCCCCCCCCCCCC)C(C1=CC(=C(C(=C1)C(C)(C)C)O)C(C)(C)C)OP(O)(O)=O Chemical compound C(CCCCCCCCCCCCCCCCC)C(C1=CC(=C(C(=C1)C(C)(C)C)O)C(C)(C)C)OP(O)(O)=O XBXODRAZJJCJAR-UHFFFAOYSA-N 0.000 description 1
- OKOBUGCCXMIKDM-UHFFFAOYSA-N Irganox 1098 Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)NCCCCCCNC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 OKOBUGCCXMIKDM-UHFFFAOYSA-N 0.000 description 1
- 241001675646 Panaceae Species 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 1
- TXQVDVNAKHFQPP-UHFFFAOYSA-N [3-hydroxy-2,2-bis(hydroxymethyl)propyl] octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(CO)(CO)CO TXQVDVNAKHFQPP-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 235000019359 magnesium stearate Nutrition 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- LIGACIXOYTUXAW-UHFFFAOYSA-N phenacyl bromide Chemical compound BrCC(=O)C1=CC=CC=C1 LIGACIXOYTUXAW-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000012763 reinforcing filler Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/40—Glass
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/35—Heterocyclic compounds having nitrogen in the ring having also oxygen in the ring
- C08K5/353—Five-membered rings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/45—Heterocyclic compounds having sulfur in the ring
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a polyester composition, which comprises the following components in parts by weight: 50-80 parts of PCT resin; 8-40 parts of filler; 0.01-0.1 part of light dispersing agent, wherein the filler is selected from at least one of flat glass fiber, round glass fiber and glass flake. The invention can obviously improve the reflectivity of light and has certain light transmittance (the light transmittance range is 53-75 percent, and the reflectivity range is 44-64 percent) by adding the specific light dispersing agent, so that the reflection angle can be increased; and the advantage of high temperature resistance is obtained by selecting specific polyester resin. The method is suitable for preparing the SMD type LED reflecting bracket.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a preparation method and application of a polyester composition.
Background
The SMD type LED reflecting support is formed by punching and molding, a plated metal material strip is placed into an injection mold, and then an LED reflecting support material is injected on the metal material strip through an injection molding machine, so that the LED reflecting support material and the metal material strip are manufactured into an LED functional piece with a reflecting cavity and capable of being welded through SMT. After die bonding, wire bonding and packaging, light emitted by the LED chip is reflected out through a certain angle, so that light loss is reduced, and the light source for LED illumination or display is formed through packaging materials such as epoxy resin or silica gel. It can be said that the LED reflective support material is a core material for LED lighting, and directly relates to the brightness and lifetime of the LED light source. The function of the LED package is to provide sufficient protection of the chip against long-term exposure to air or mechanical damage to failure of the chip to improve the chip stability.
The common SMD type LED reflective support material is PPA or PCT and a thermoplastic material filled with reinforcing filler and titanium white. Because titanium dioxide is shading pigment, SMD type LED reflecting support materials in the current market are opaque and shading materials, so that the luminous angle of the packaged lamp beads cannot reach 180 degrees, as shown in an attached figure 1 of the specification. In the current industry, in order to maximize the light emitting angle of the lamp bead, a method of adding a PMMA lens is adopted outside the SMD lamp bead, as shown in the attached figure 2 of the specification. Although the method can improve the light emitting angle of the SMD lamp bead, the lens is required to be added, and the investment is required to be increased in the process and the cost.
Meanwhile, the SMD type LED reflective support material needs to be added with fillers such as titanium dioxide, and the reflectivity of the material can be improved, but the strength and toughness of the material are greatly influenced, so that the SMD type lamp beads have the problems of cracking, lamp death and the like in the use process.
Disclosure of Invention
The invention aims to provide a polyester composition which has higher light reflectivity, has certain light transmittance and increases the reflection angle. The invention also discloses a preparation method and application thereof.
The invention is realized by the following technical scheme:
the polyester composition comprises the following components in parts by weight:
50-80 parts of PCT resin;
8-40 parts of filler;
0.01-0.1 part of light dispersing agent;
the filler is at least one of flat glass fiber, round glass fiber and glass flake;
the light diffusing agent has the structure that
Wherein R is 2 、R 3 、R 4 、R 5 Each independently represents one of a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an aryl group having 1 to 9 carbon atoms, a halogen atom, a heterocyclic group having 1 to 6 carbon atoms, an ester group having 1 to 6 carbon atoms, and a cyano group;
R 1 is that
One of them.
Preferably, R 1 Is that One of them.
Preferably, the content of the light diffusing agent is 0.0005-0.001 times of the weight content of the PCT resin.
In the polyester composition, the aspect ratio (retention length/major axis diameter) of the flat glass fiber is in the range of 0.3 to 228, preferably 1 to 200, more preferably 3 to 100;
preferably, the flat glass fiber has a flattening ratio of 2 to 7, preferably 4 to 6.
In the polyester composition, the length-diameter ratio of the circular glass fiber ranges from 2 to 352; preferably, the round glass fibers have an aspect ratio in the range of 5 to 300, more preferably 15 to 200.
In the polyester composition, the D50 particle size of the glass flakes ranges from 5 to 250 micrometers; preferably, the D50 particle size of the glass flakes is in the range of 10-200 microns, more preferably 20-160 microns.
The PCT resin has a melting point of 260-300 ℃ measured by differential scanning calorimetry at a heating/cooling rate of 20 ℃/min.
Whether at least one of 0-2 parts of antioxidant and lubricant is added or not can be selected according to actual requirements.
The antioxidant may be: 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene; 2, 5-di-tert-butyl-4-hydroxybenzyl dimethylamine; diethyl-3, 5-di-tert-butyl-4-hydroxybenzyl phosphate; stearyl-3, 5-di-tert-butyl-4-hydroxybenzyl phosphate; 3, 5-di-tert-butyl-4-hydroxyphenyl-3, 5-distearyl-thiotriazolylamine; 2, 6-di-tert-butyl-4-hydroxymethylphenol; 2, 4-bis- (n-octylsulfanyl) -6- (4-hydroxy-3, 5-di-tert-butylglycerylethyl ether) -1,3, 5-triazine; n, N' -hexamethylenebis (3, 5-di-tert-butyl-4-hydroxy-hydrocinnamamide); n, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine; octadecyl-3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate; pentaerythritol-tetrakis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ]; triethylene glycol-bis [3- (3, 5-dimethyl-4-hydroxyphenyl) propionate ]; triethylene glycol bis [ beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate ];2,2' -thiodiethyl-bis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, and the like.
The lubricant may be: at least one of a stearate type lubricant, a fatty acid type lubricant, and a stearate type lubricant; the stearate lubricant is at least one selected from calcium stearate, magnesium stearate and zinc stearate; the fatty acid lubricant is at least one of fatty acid, fatty acid derivative and fatty acid ester; the stearate lubricant is at least one selected from pentaerythritol stearate.
The preparation method of the high-temperature resistant polyester composition comprises the following components: mixing polyester resin, filler and light dispersing agent in a high-speed mixer according to the proportion, and carrying out melt blending, extrusion granulation on the mixture by a double-screw extruder to obtain a high-temperature-resistant polyester composition; wherein the heating temperature of the extruder is as follows: zone 1 250-290 ℃, zone 2-4 260-300 ℃, zone 5-7 270-310 ℃, zone 8-9 260-300 ℃ and handpiece 250-290 ℃.
The glass fiber can be long glass fiber or short glass fiber, if continuous glass fiber is selected, the glass fiber is fed and added at the side. The chopped glass fiber is a product obtained by cutting continuous glass fiber into short lengths in advance by manufacturers.
The high temperature resistant polyester composition of the present invention is a 60X 1.0mm molded article prepared at a mold temperature of 60 ℃, the molded article having a light transmittance ranging from 53% to 75% and a reflectance ranging from 44% to 64%.
The invention has the following beneficial effects:
the high-temperature resistant polyester composition can excite and absorb invisible light (the wavelength range is about 60-380 nm) to be converted into blue light with longer wavelength by adding the light dispersing agent with specific content and structure, and simultaneously reflect more blue light with the wavelength range of 400-600nm compared with the original incident light, so that the light reflectivity of the polyester composition can be remarkably improved. Meanwhile, the reflectivity can be further improved but the light transmittance is little influenced by glass fillers such as flat glass fibers, round glass fibers, glass flakes and the like with specific content and appearance, and the reflection angle can be increased when the glass filler is applied to an SMD type LED reflection bracket (shown in an attached figure 3 of the specification); and the polyester composition of the present invention achieves the advantage of high temperature resistance. The method is suitable for preparing the SMD type LED reflecting bracket.
Drawings
Fig. 1: the structure of the opaque SMD type LED reflective support material in the current market is schematically shown.
Fig. 2: and a structural schematic diagram of the PMMA lens is additionally arranged outside the SMD lamp beads.
Fig. 3: the high-temperature-resistant polyester composition is applied to an SMD type LED reflection bracket light reflection schematic diagram.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
The sources of the raw materials used in the invention are as follows:
PCT resin a: PCT 0502, SK chemical industry. Melting point 286 ℃ (measured at a rate of 20 ℃/min rise/fall);
PCT resin B: PCT 0502hc, sk chemical. Melting point 295 ℃ (measured at a rate of 20 ℃/min rise/fall);
light diffusing agent a:
OB-1, hongbang, chemical Co., ltd;
light diffusing agent B:
KSN, hongbang Yi chemical Co., ltd;
light diffusing agent C:
commercially available CAS2866-43-5.
Light diffusing agent D:
DT, (CAS No. 1041-00-5), zhejiang Hongbai Chemie Co., ltd;
light diffusing agent E: acrylic light-diffusing powder TY-660, hunan jin Yu fine chemical Co., ltd.
Titanium white powder: BLR-886, purchased from Pythagorean.
Round glass fiber A: the trade name is ECS10-03-568H, and the manufacturer is JUSHI;
flat glass fiber a: the flattening ratio is 2, cpic;
flat glass fiber B: chopping, wherein the flattening ratio is 3, and the manufacturer is CPIC;
flat glass fiber C: chopping, wherein the flattening ratio is 4, and the manufacturer is CPIC;
flat glass fiber D: chopping, wherein the flattening ratio is 6, CPIC;
glass flakes were purchased from glassflag company, uk, and then screened to obtain a raw material of a specific particle size.
Glass flake a: d50 =11.6 microns;
glass flake B: d50 =23.5 microns;
glass flake C: d50 =158.4 micrometers;
glass flake D: d50 =199.5 micrometers;
glass flake E: d50 =5.3 microns;
glass flake F: d50 = 239.7 micrometers;
the test method of the D50 particle size comprises the following steps: the particle size values corresponding to the cumulative percentage distribution reaching 50% were measured using a malvern wet laser particle size analyzer. Preparation method of high temperature resistant polyester compositions of examples and comparative examples: mixing polyester resin, filler and light dispersing agent in a high-speed mixer according to the proportion, and carrying out melt blending, extrusion granulation on the mixture by a double-screw extruder to obtain a high-temperature-resistant polyester composition; wherein the heating temperature of the extruder is as follows: zone 1 250-290 ℃, zone 2-4 260-300 ℃, zone 5-7 270-310 ℃, zone 8-9 260-300 ℃ and handpiece 250-290 ℃. The retained aspect ratio of the glass fibers is controlled by adjusting the shear strength of the screw, or the glass fibers are crushed to a size close to the designed particle size range by pre-crushing.
The testing method comprises the following steps:
(1) The method for testing the length-diameter ratio of glass fiber and the D50 particle size of glass flake in the high-temperature resistant polyester composition comprises the following steps:
glass fiber length-diameter ratio: 100g of material sample is weighed, ablated for 1h and cooled at the high temperature of 800 ℃ to obtain glass fiber in the material. Uniformly dispersing the obtained glass fibers in 200ml of water, pouring 10ml of glass fiber dispersed suspension into a culture dish, selecting a plurality of areas by utilizing a microscope, projecting the glass fiber areas onto a screen, collecting pictures, testing the lengths of the glass fibers in the pictures to obtain a normal distribution diagram, and taking the value corresponding to the median in the normal distribution diagram as the retention length of the glass fibers. The ratio of the glass fiber retention length/glass fiber diameter (or flat glass fiber long axis diameter) is used as the aspect ratio of the glass fiber.
Glass flake D50 particle size: 100g of material sample is weighed, ablated for 1h and cooled at the high temperature of 800 ℃ to obtain glass flakes in the material. The obtained glass flakes were uniformly dispersed in 200ml of water, the particle size was measured using a laser particle size analyzer of malvern panaceae, and the glass flakes D50 particle size was obtained in the measurement result.
(2) Transmittance: an SGW-820 (WGT-2S) light transmittance meter was used. A test piece having a length of 60mm, a width of 60mm and a thickness of 1mm was prepared by injection molding, and the light transmittance of the light source (2856K) of sample A was measured.
(3) Reflectivity: measured using Color Eye 7000A Color difference meter. The test piece with the length of 60mm, the width of 60mm and the thickness of 1mm is prepared by injection molding at the die temperature of 60 ℃. The reflectance was evaluated with the reflectance at 460nm as a representative value.
Table 1: examples 1-7 polyester compositions component content (parts by weight) and test results
As is clear from examples 2/4-6, the light diffusing agent having the structure of the present invention can significantly improve the light reflectance, and the polyester composition also has a high light transmittance.
Table 2: examples 8-15 polyester compositions component content (parts by weight) and test results
As is clear from examples 2/7 to 9, the light diffusing agent preferably has a light transmittance and a reflectance higher than those of the PCT resin in an amount of 0.0005 to 0.001 times the weight of the PCT resin.
Continuing with table 2:
as is clear from examples 2/10-15, the transmittance increases but the reflectance decreases with increasing aspect ratio, and in order to realize the production of the SMD type LED reflective support, the aspect ratio of the circular glass fiber is preferably 5 to 300, more preferably 15 to 200.
Table 3: examples 16-25 polyester compositions each component content (parts by weight) and test results
As is clear from examples 16 to 19, it is preferable that the flat glass fiber has a flattening ratio of 4 to 6, and both the transmittance and reflectance are higher.
Continuing with table 3:
as is clear from examples 16/20 to 25, as the aspect ratio increases, the light transmittance increases but the reflectance decreases, and in order to realize the production of the SMD type LED reflective support, it is preferable that the circular glass fiber has an aspect ratio of 1 to 200, more preferably 3 to 100.
Table 4: examples 26-31 polyester compositions each component content (parts by weight) and test results
As is clear from examples 26 to 31, as the D50 particle size of the glass flake increases, the transmittance increases but the reflectance decreases, preferably the D50 particle size is 10 to 200. Mu.m, more preferably 20 to 160. Mu.m.
Table 5: comparative example polyester composition content (parts by weight) of each component and test results
As is clear from example 2 and comparative example 1, the conventional light diffusing agent cannot achieve the effects of high light transmittance and high reflection.
As is clear from comparative example 2/3/4, if the content of the light diffusing agent is too low, not only the reflectance is low, but also the light transmittance is insufficient; if the content of the light diffusing agent is too high, the light transmittance is too low.
As is clear from comparative example 5, titanium white powder can significantly improve reflectance but also severely reduce light transmittance.
Claims (10)
1. The polyester composition is characterized by comprising the following components in parts by weight:
50-80 parts of PCT resin;
8-40 parts of filler;
0.01-0.1 part of light dispersing agent;
the filler is at least one of flat glass fiber, round glass fiber and glass flake;
the light diffusing agent has the structure that
Wherein R is 2 、R 3 、R 4 、R 5 Each independently represents one of a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an aryl group having 1 to 9 carbon atoms, a halogen atom, a heterocyclic group having 1 to 6 carbon atoms, an ester group having 1 to 6 carbon atoms, and a cyano group;
R 1 is that、/>、/>、、/>、/>、/>One of them.
2. The polyester composition according to claim 1, wherein R 1 Is that、/>、/>One of them.
3. The polyester composition according to claim 1, wherein the light diffusing agent is contained in an amount of 0.0005 to 0.001 times by weight based on the PCT resin.
4. The polyester composition according to claim 1, wherein the aspect ratio of the flat glass fibers in the polyester composition is in the range of 0.3 to 228, preferably 1 to 200, more preferably 3 to 100; the flat ratio of the flat glass fiber section is 2-7, preferably 4-6.
5. The polyester composition according to claim 1, wherein the aspect ratio of the round glass fibers in the polyester composition is in the range of 2 to 352, preferably 5 to 300, more preferably 15 to 200.
6. Polyester composition according to claim 1, wherein the glass flakes have a D50 particle size in the range of 5 to 250 micrometers, preferably 10 to 200 micrometers, more preferably 20 to 160 micrometers.
7. The polyester composition of claim, wherein the PCT resin has a melting point of 260 to 300 ℃ as measured by differential scanning calorimetry at a heating and cooling rate of 20 ℃/min.
8. The polyester composition according to claim 1, further comprising 0 to 2 parts by weight of an auxiliary agent selected from at least one of an antioxidant and a lubricant.
9. A process for the preparation of a polyester composition as claimed in any one of claims 1 to 8, comprising the following components: mixing polyester resin, filler and light dispersing agent according to the proportion, and carrying out melt blending, extrusion granulation on the mixture by an extruder to obtain a high-temperature-resistant polyester composition; wherein the heating temperature of the extruder is as follows: zone 1 250-290 ℃, zone 2-4 260-300 ℃, zone 5-7 270-310 ℃, zone 8-9 260-300 ℃ and handpiece 250-290 ℃.
10. Use of the polyester composition according to any of claims 1 to 8 for the preparation of SMD type LED reflective supports.
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