CN103724974B - High-light-reflectivity PC (polycarbonate) film material and preparation method thereof - Google Patents
High-light-reflectivity PC (polycarbonate) film material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-light-reflectivity PC (polycarbonate) film material and a preparation method thereof, relating to the field of high polymer compound materials. The preparation method comprises the following steps: (1) preparing a titanium dioxide compound, namely uniformly mixing 25-75 percent of flaky titanium dioxide which has the average diameter of 5-30mu m and the average thickness of 0.1-1.5mu m and 25-75 percent of spherical titanium dioxide which has the average grain diameter of 0.1-0.8mu m by using a high-speed mixer to prepare the titanium dioxide compound; (2) preparing the high-light-reflectivity PC film material, namely mixing 16-32 percent of titanium dioxide compound prepared in the step (1), 67-83 percent of PC and 1 percent of simethicone, extruding by using a double-screw extruder, pelleting, and drying to prepare the high-light-reflectivity PC film material. According to the high-light-reflectivity PC film material, partial flaky titanium dioxide and spherical titanium dioxide are compounded as high reflection filler, compared with single use of spherical titanium dioxide particles, the light reflectivity of the reflecting film disclosed by the invention is higher, the mechanical property of the PC film material is better, the utilization ratio of the titanium dioxide is increased, the using amount of the titanium dioxide is reduced and the production cost is lowered.
Description
Technical field
The present invention relates to a kind of high light reflectivity PC thin-film materials and preparation method thereof, belong to macromolecular compound material neck
Domain.
Background technology
In recent years, liquid crystal display has the advantages that high image quality, low energy consumption, space-efficient because of it, gradually replaces former
Some cathode-ray tubes and turn into the market mainstream.But to show one's talent in numerous displays, it is necessary to further improve
The display effect of liquid crystal display, especially brightness and uniformity.In fact, liquid crystal does not light in itself, therefore improve its backlight
The brightness in source, reduces the active demand that light loss is liquid crystal and backlight industry.Reflectance coating is the one of backlight of LCD
Individual significant components, its Main Function is that the light that will spill light guide plate bottom efficiently reflects, so as to reduce light loss, reduces and uses
Electricity, there is provided give LCD light saturation degree.The High Level of large screen and display performance due to liquid crystal display device will
Seek the reflectance coating, it is necessary to high reflectance.The optical property of reflectance coating how is improved, reflectivity is improved, light loss is reduced, so that
Obtain the light sent from light source can at utmost be utilized, be a present field of liquid crystal display major issue urgently to be resolved hurrily.
At present, the invention of many optical reflection film materials is occurred in that both at home and abroad, and its membrane material species mainly has：Polypropylene
（PP）, polyethylene terephthalate（PET）And makrolon（PC）Deng for example：Chinese patent CN 201110077909.3
A kind of PP fretting maps reflectance coating is disclosed, the reflectance coating is with PP, maleic anhydride and composite foamable agent as primary raw material；It is Chinese special
Sharp CN 201120406203.2 discloses a kind of PP fretting map reflectance coatings with uvioresistant cortex；Chinese patent CN
200780023645.5 disclose a kind of white reflection film, are that PET film is carried out into biaxial stretch-formed formation micropore, then in the reflectance coating
At least one face on apply last layer spherical particle PET reflection film；Described in Chinese patent CN 201010589161.0
Reflection diaphragm is, with PET as base material, then to add organic foaming agent and that inorganic particle is prepared from is a kind of with high reflectance
PET reflection piece；Chinese patent CN 201120406619.2 discloses a kind of PET fretting maps reflectance coating, and the reflectance coating carries anti-purple
Outside line cortex.
Compared with PP and PET, PC optical reflection films have heat resistance higher, can in a liquid crystal display long-term use without
Deformation, receives more and more attention in recent years.The method for preparing PC optical reflection films at present is mainly by adding light reflection grain
Son makes reflectance coating produce micropore or bubble, using between the refraction of light reflective particle or the substrate resin of film and micropore or bubble
Refractive index difference improve reflectivity.
At present, the topmost preparation method of PC optical reflection films is addition light reflective particle method, and its light reflective particle is mainly
Titanium dioxide, its adding method is mainly titanium dioxide and other additives are directly blended with PC, such as Chinese patent CN
200580031123.0, by the blending of PC-PDMS copolymers, PC, titanium dioxide, polytetrafluoroethylene (PTFE) and organosiloxane, obtain
High reflectivity, the PC reflectance coatings of light-proofness high；PC reflectance coatings disclosed in Chinese patent CN 200580050285.9 be by PC,
What the blending such as particulate titanium dioxide, grafted ethylene copolymer of modified rubber was obtained；Chinese patent CN 200680048674.2
Described optical reflection film is with A, B layer of optical reflection film of resin combination stepped construction；Chinese patent CN
200710164110.1 by PC, PC containing bromination, acrylic acid copolymerization thing, particulate titanium dioxide, antioxidant, lubricant and
PTFE micro mists are blended, and are prepared for a kind of PC reflectance coatings of high light reflectivity；PC described in Chinese patent CN 200880100808.x
Reflectance coating includes PC copolymers, titanium dioxide, fire retardant；Chinese patent CN 200910003074.x are by methacrylic acid five
At least two have different refractivity in bromobenzene base ester, PC, polystyrene, polymethyl methacrylate, polypropylene, polyethylene
Material and inorganic particle（Spherical titanium dioxide, zinc oxide, calcium carbonate, silica etc. or its combination）Blending, obtains light anti-
Penetrate material；Anti-flammability PC reflectance coatings described in Chinese patent CN 200910146519.x include aromatic series PC resin（Contain height
Flowing PC copolymers or PC-polydimethylsiloxanecopolymer copolymer）, spherical titanium dioxide, fire retardant, alkali neutralisation treatment and silicon
The talcum that oxygen alkane coupling agent surface treatment is crossed；Chinese patent CN 201110208729.4 is by PC and particulate titanium dioxide, two
Aluminum oxide is mixed and made into reflection film raw material, and by drying extrusion molding, natural cooling obtains a kind of PC reflectance coatings；Japan Patent JP
1995242810, by adding titanium dioxide and other fillers, are prepared for a kind of PC optical reflection films with high reflectance；Japan
Patent JP 2004149623 discloses one kind has anti-flammability, high reflectivity, the PC reflectance coatings of light-proofness high, and the reflectance coating is
PC system: compositions and titanium dioxide are prepared from by blending；The PC reflectance coatings that United States Patent (USP) US 7964273B2 are introduced are included
There are 70-95%PC polymer and 5-30% titanium dioxide；United States Patent (USP) US 20060159926Al are by PC-PDMS copolymers, ball
There is blocking on shape titanium dioxide blending, the surface of sheet material at least one or absorbs the resistance to photosphere of ultraviolet.
In sum, because PC heat resistances are higher, in a liquid crystal display can long-term use, therefore, PC reflectance coatings into
It is a developing direction.How the reflectivity of PC reflectance coating is further improved, so that the light that light source sends is by utmost
Utilize, be a present field of liquid crystal display major issue urgently to be resolved hurrily.
Light reflection filler in current PC optical reflection films is spherical or irregular particle shape titanium dioxide, and reflectivity is relatively
Low, the addition of titanium dioxide is of a relatively high.Raising with liquid crystal display to brightness requirement, the reflectivity of PC reflectance coatings has
Treat further raising.
This patent is compounded with spherical titanium dioxide using plate-like titanium dioxide and reflects filler as light, is blended to form height with PC
Light reflected P C thin-film materials, compared with spherical titanium dioxide is used merely, light reflectivity is higher, yet there are no relevant report.
The content of the invention
Light reflectivity it is an object of the invention to overcome above-mentioned optical reflection films of PC in the prior art to exist is relatively low, two
Titanium oxide usage amount defect higher, part spherical titanium dioxide is substituted by using plate-like titanium dioxide, and by sheet dioxy
Change titanium to be blended to use with spherical titanium dioxide compounding, be prepared for high light reflectivity PC thin-film materials.One aspect of the present invention is further carried
The light reflectivity of PC optical reflection films high, improves mechanical strength, meets liquid crystal display to light reflected P C thin-film materials
It is required that；On the other hand the utilization rate of titanium dioxide is improve, the usage amount of titanium dioxide is reduced, production cost is reduced.
Principle of the invention is：When illumination is mapped to the titanium dioxide in PC base materials, for spherical or irregular particle shape
Titanium dioxide, light is scattered to all directions, which reduces the intensity of the reflected light in opposite direction with incident light, and piece
Shape titanium dioxide is plane because of its surface, and when light is radiated at its surface, its light is mainly the opposite direction scattering to incident light,
Which adds reflected light, so as to improve the reflectivity of reflectance coating.But plate-like titanium dioxide is excessively used, due to reflection
The directionality of light, makes overall reflective light uneven, it is necessary to adding spherical titanium dioxide obtains uniform reflected light.Use sheet two
Titanium oxide and spherical titanium dioxide compounding can obtain that reflected intensity is high and uniform reflected light.
Present disclosure is：A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterised in that it is by dioxy
Change titanium compound, makrolon（PC）Constituted with dimethicone raw material；Mass percent shared by described each raw material is：Dioxy
Change titanium compound 16% -32%, PC 67% -83%, dimethicone 1%, preferably：Titanium dioxide compound 20% -28%, PC
71% -79%, dimethicone 1%, mass percent sum shared by each raw material is 100%.
A kind of described high light reflectivity PC thin-film materials and preparation method thereof, it is characterised in that described titanium dioxide compounding
Thing is made up of plate-like titanium dioxide and spherical titanium dioxide raw material, and sheet and spherical titanium dioxide crystal formation are rutile-type；Institute
The average diameter of the plate-like titanium dioxide stated is 5-30 μm, preferably 15-25 μm；Average thickness is 0.1-1.5 μm, preferably
It is 0.2-0.5 μm；Average aspect ratio is 13-200, preferably 40-120；The average grain diameter of described spherical titanium dioxide is
0.1-0.8 μm, preferably 0.2-0.4 μm；In described titanium dioxide compound, plate-like titanium dioxide ratio be 25%-
75%th, spherical titanium dioxide ratio is 25% -75%, preferably：Plate-like titanium dioxide 50% -75%, spherical titanium dioxide 25% -
50%, mass percent sum shared by spherical titanium dioxide and plate-like titanium dioxide is 100%.
Described a kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterised in that it is comprised the following steps：
（1）The preparation of titanium dioxide compound：By 25%-75% average diameter be 5-30 μm, average thickness be 0.1-
1.5 μm of plate-like titanium dioxide and the spherical titanium dioxide high-speed mixer that 25%-75% average grain diameter is 0.1-0.8 μm
It is well mixed, prepare titanium dioxide compound；
(2）The preparation of light reflected P C particles：By 16% -32% step（1）Titanium dioxide compound, 67% -83% of preparation
PC and 1% dimethicone mixing, with double screw extruder extrude, granulation, drying, prepare light reflected P C film materials
Material.
Compared with prior art, the present invention has following features and beneficial effect：
(1）Part spherical titanium dioxide is substituted by using plate-like titanium dioxide, by plate-like titanium dioxide and spherical dioxy
Change titanium compounding to be blended to use, compared with spherical titanium dioxide is used merely, the light reflectivity of the light reflected P C films of preparation is higher,
Further meet requirement of the liquid crystal display to light reflected P C thin-film materials；
（2）The addition of plate-like titanium dioxide, compared with spherical titanium dioxide is used merely, on the one hand improves reflectance coating
Mechanical strength, on the other hand improves the utilization rate of titanium dioxide, reduces the usage amount of titanium dioxide, reduces and is produced into
This.
Specific embodiment
Technical characterstic of the invention is further elucidated below by embodiment.These embodiments are only used for helping right
The purpose of the understanding of the technology of the present invention, must not be in this, as the further limitation to the scope of the present invention.
For ease of understanding the implementation result of embodiment, light reflected P C thin-film material Single screw extrusions prepared by embodiment
Slobbering machine is prepared into the PC films that thickness is 250 μm, the light reflectivity of testing film.
Comparative example 1
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
The dimethicone of spherical titanium dioxide that 16% average grain diameter is 0.4 μm, 83% PC and 1% is mixed, double spiral shells are used
Bar extruder extrusion, granulation, drying, prepare light reflected P C thin-film materials.With the reflection of its 250 μ m-thick PC film for preparing
Rate test result is as shown in table 1.
Comparative example 2
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
The dimethicone of spherical titanium dioxide that 24% average grain diameter is 0.2 μm, 83% PC and 1% is mixed, double spiral shells are used
Bar extruder extrusion, granulation, drying, prepare light reflected P C thin-film materials.With the reflection of its 250 μ m-thick PC film for preparing
Rate test result is as shown in table 5.
Embodiment 1
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
16% average thickness is 1.0 μm, the diformazan of the plate-like titanium dioxide that average diameter is 5 μm, 83% PC and 1%
Base silicone oil mixes, and is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Prepared with it
The reflectance test result of 250 μ m-thick PC films is as shown in table 1.
Embodiment 2
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
16% average thickness is 1.0 μm, the diformazan of the plate-like titanium dioxide that average diameter is 10 μm, 83% PC and 1%
Base silicone oil mixes, and is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Prepared with it
The reflectance test result of 250 μ m-thick PC films is as shown in table 1.
Embodiment 3
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
16% average thickness is 1.0 μm, the diformazan of the plate-like titanium dioxide that average diameter is 15 μm, 83% PC and 1%
Base silicone oil mixes, and is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Prepared with it
The reflectance test result of 250 μ m-thick PC films is as shown in table 1.
Embodiment 4
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
16% average thickness is 1.0 μm, the diformazan of the plate-like titanium dioxide that average diameter is 20 μm, 83% PC and 1%
Base silicone oil mixes, and is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Prepared with it
The reflectance test result of 250 μ m-thick PC films is as shown in table 1.
Embodiment 5
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
16% average thickness is 1.0 μm, the diformazan of the plate-like titanium dioxide that average diameter is 30 μm, 83% PC and 1%
Base silicone oil mixes, and is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Prepared with it
The reflectance test result of 250 μ m-thick PC films is as shown in table 1.
Influence of the plate-like titanium dioxide average diameter of table 1 to PC reflectance coating reflectivity
As it can be seen from table 1 filler is reflected using plate-like titanium dioxide as light, than being compared using spherical titanium dioxide,
The reflectivity of the reflectance coating of preparation is significantly improved.As plate-like titanium dioxide average diameter increases to 20 μm, in reflectance coating from 5 μm
Reflecting interface also accordingly increase, the reflectivity of final reflectance coating is improved.But when average diameter reaches 30 μm, due to
It is relatively large in diameter, and is easily broken in process so that reflecting interface is reduced, and is unfavorable for the raising of reflectivity.
Embodiment 6
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
16% average thickness is 1.5 μm, the diformazan of the plate-like titanium dioxide that average diameter is 20 μm, 83% PC and 1%
Base silicone oil mixes, and is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Prepared with it
The reflectance test result of 250 μ m-thick PC films is as shown in table 2.
Embodiment 7
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
16% average thickness is 0.8 μm, the diformazan of the plate-like titanium dioxide that average diameter is 20 μm, 83% PC and 1%
Base silicone oil mixes, and is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Prepared with it
The reflectance test result of 250 μ m-thick PC films is as shown in table 2.
Embodiment 8
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
16% average thickness is 0.5 μm, the diformazan of the plate-like titanium dioxide that average diameter is 20 μm, 83% PC and 1%
Base silicone oil mixes, and is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Prepared with it
The reflectance test result of 250 μ m-thick PC films is as shown in table 2.
Embodiment 9
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
16% average thickness is 0.2 μm, the diformazan of the plate-like titanium dioxide that average diameter is 20 μm, 83% PC and 1%
Base silicone oil mixes, and is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Prepared with it
The reflectance test result of 250 μ m-thick PC films is as shown in table 2.
Embodiment 10
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
16% average thickness is 0.1 μm, the diformazan of the plate-like titanium dioxide that average diameter is 20 μm, 83% PC and 1%
Base silicone oil mixes, and is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Prepared with it
The reflectance test result of 250 μ m-thick PC films is as shown in table 2.
Influence of the plate-like titanium dioxide thickness of table 2 to PC optical reflection film reflectivity
The reflectivity that can be seen that reflectance coating by the data of table 2 is gradually stepped up with the reduction of plate-like titanium dioxide thickness,
When thickness reaches 0.2 μm, when the radius-thickness ratio of plate-like titanium dioxide reaches 100, reflectivity is maximum；But when thickness is too small, increase
The transmitance of light is added, reflectivity has declined.
Embodiment 11
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
（1）The preparation of titanium dioxide compound：Average thickness is 0.2 μm, the sheet dioxy that average diameter is 20 μm
Change titanium with the spherical titanium dioxide that average grain diameter is 0.4 μm by 12:4 ratio, it is well mixed with high-speed mixer, prepare
Titanium dioxide compound；
（2）The preparation of light reflected P C thin-film materials：By step（1）Titanium dioxide compound, 83% PC of 16% for preparing
Dimethicone mixing with 1%, is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.With
The reflectance test result of its 250 μ m-thick PC film for preparing is as shown in table 3.
Embodiment 12
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
（1）The preparation of titanium dioxide compound：Average thickness is 0.2 μm, the sheet dioxy that average diameter is 20 μm
Change titanium with the spherical titanium dioxide that average grain diameter is 0.4 μm by 8:8 ratio, it is well mixed with high-speed mixer, prepare
Titanium dioxide compound；
（2）The preparation of light reflected P C thin-film materials：By step（1）Titanium dioxide compound, 83% PC of 16% for preparing
Dimethicone mixing with 1%, is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.With
The reflectance test result of its 250 μ m-thick PC film for preparing is as shown in table 3.
Embodiment 13
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
（1）The preparation of titanium dioxide compound：Average thickness is 0.2 μm, the sheet dioxy that average diameter is 20 μm
Change titanium with the spherical titanium dioxide that average grain diameter is 0.4 μm by 4:12 ratio, it is well mixed with high-speed mixer, prepare
Titanium dioxide compound；
（2）The preparation of light reflected P C thin-film materials：By step（1）Titanium dioxide compound, 83% PC of 16% for preparing
Dimethicone mixing with 1%, is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.With
The reflectance test result of its 250 μ m-thick PC film for preparing is as shown in table 3.
The sheet of table 3 and influence of the spherical titanium dioxide compound proportion to PC optical reflection film reflectivity
As can be seen from Table 3, compounded by by sheet, spherical titanium dioxide, sheet and spherical titanium dioxide are used than simple
Titanium, the reflectivity of the reflectance coating of preparation is significantly improved.With the addition of spherical titanium dioxide, light is irradiated into inside base material
When, make the uniform light of inside, the uneven light produced by plate-like titanium dioxide is compensate for, so as to improve light in reflectance coating
Scattered reflection ability, the reflectivity of reflectance coating increased.But when plate-like titanium dioxide content continues to reduce, reduce
Base material internal light reflection interface, so as to reduce light order of reflection, reflectivity is decreased obviously.
Embodiment 14
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
（1）The preparation of titanium dioxide compound：Average thickness is 0.2 μm, the sheet dioxy that average diameter is 20 μm
Change titanium with the spherical titanium dioxide that average grain diameter is 0.8 μm by 12:4 ratio, it is well mixed with high-speed mixer, prepare
Titanium dioxide compound；
（2）The preparation of light reflected P C thin-film materials：By 16% step（1）The titanium dioxide compound of preparation, 83% PC and
1% dimethicone mixing, is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Use it
The reflectance test result of the 250 μ m-thick PC films for preparing is as shown in table 4.
Embodiment 15
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
（1）The preparation of titanium dioxide compound：Average thickness is 0.2 μm, the sheet dioxy that average diameter is 20 μm
Change titanium with the spherical titanium dioxide that average grain diameter is 0.6 μm by 12:4 ratio, it is well mixed with high-speed mixer, prepare
Titanium dioxide compound；
（2）The preparation of light reflected P C thin-film materials：By 16% step（1）The titanium dioxide compound of preparation, 83% PC and
1% dimethicone mixing, is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Use it
The reflectance test result of the 250 μ m-thick PC films for preparing is as shown in table 4.
Embodiment 16
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
（1）The preparation of titanium dioxide compound：Average thickness is 0.2 μm, the sheet dioxy that average diameter is 20 μm
Change titanium with the spherical titanium dioxide that average grain diameter is 0.2 μm by 12:4 ratio, it is well mixed with high-speed mixer, prepare
Titanium dioxide compound；
（2）The preparation of light reflected P C thin-film materials：By 16% step（1）The titanium dioxide compound of preparation, 83% PC and
1% dimethicone mixing, is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Use it
The reflectance test result of the 250 μ m-thick PC films for preparing is as shown in table 4.
Embodiment 17
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
（1）The preparation of titanium dioxide compound：Average thickness is 0.2 μm, the sheet dioxy that average diameter is 20 μm
Change titanium with the spherical titanium dioxide that average grain diameter is 0.1 μm by 12:4 ratio, it is well mixed with high-speed mixer, prepare
Titanium dioxide compound；
（2）The preparation of light reflected P C thin-film materials：By 16% step（1）The titanium dioxide compound of preparation, 83% PC and
1% dimethicone mixing, is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Use it
The reflectance test result of the 250 μ m-thick PC films for preparing is as shown in table 4.
Influence of the spherical titanium dioxide particle diameter of table 4 to PC optical reflection film reflectivity
Found out by table 4, when the average thickness of plate-like titanium dioxide and the roughly the same average grain diameter of spherical titanium dioxide,
The reflectivity of reflectance coating is improved.
Embodiment 18
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
（1）The preparation of titanium dioxide compound：Average thickness is 0.2 μm, the sheet dioxy that average diameter is 20 μm
Change titanium with the spherical titanium dioxide that average grain diameter is 0.2 μm by 15:5 ratio, it is well mixed with high-speed mixer, prepare
Titanium dioxide compound；
（2）The preparation of light reflected P C thin-film materials：By 20% step（1）The titanium dioxide compound of preparation, 80% PC and
1% dimethicone mixing, is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Use it
The reflectance test result of the 250 μ m-thick PC films for preparing is as shown in table 5.
Embodiment 19
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
（1）The preparation of titanium dioxide compound：Average thickness is 0.2 μm, the sheet dioxy that average diameter is 20 μm
Change titanium with the spherical titanium dioxide that average grain diameter is 0.2 μm by 18:6 ratio, it is well mixed with high-speed mixer, prepare
Titanium dioxide compound；
（2）The preparation of light reflected P C thin-film materials：By 24% step（1）The titanium dioxide compound of preparation, 76% PC and
1% dimethicone mixing, is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Use it
The reflectance test result of the 250 μ m-thick PC films for preparing is as shown in table 5.
Embodiment 20
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
（1）The preparation of titanium dioxide compound：Average thickness is 0.2 μm, the sheet dioxy that average diameter is 20 μm
Change titanium with the spherical titanium dioxide that average grain diameter is 0.2 μm by 21:7 ratio, it is well mixed with high-speed mixer, prepare
Titanium dioxide compound；
（2）The preparation of light reflected P C thin-film materials：By 28% step（1）The titanium dioxide compound of preparation, 76% PC and
1% dimethicone mixing, is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.Use it
The reflectance test result of the 250 μ m-thick PC films for preparing is as shown in table 5.
Embodiment 21
A kind of high light reflectivity PC thin-film materials and preparation method thereof, it is characterized in that comprising the following steps：
（1）The preparation of titanium dioxide compound：Average thickness is 0.2 μm, the sheet dioxy that average diameter is 20 μm
Change titanium with the spherical titanium dioxide that average grain diameter is 0.2 μm by 24:8 ratio, it is well mixed with high-speed mixer, prepare
Titanium dioxide compound；
（2）The preparation of light reflected P C thin-film materials：By 32% step（1）The titanium dioxide compound of preparation, 76% PC and
1% dimethicone mixing, is extruded with double screw extruder, granulated, dried, and prepares light reflected P C thin-film materials.
Reflectance test result with its 250 μ m-thick PC film for preparing is as shown in table 5.
Influence of the content of the light of table 5 reflection filler to reflectance coating reflectivity
As can be seen from Table 5, the reflectance coating that filler preparation is reflected as light is compounded by using sheet and spherical titanium dioxide,
Compared with spherical titanium dioxide is used alone as light reflection filler, its mechanical strength increases.As light reflection filler contains
The increase of amount, the mechanical strength of reflectance coating is gradually stepped up, but reflectivity is relatively low；When light reflection filer content increases to 24%,
Mechanical strength has declined, but reflectivity highest；When light reflection filer content is further improved, reflectivity stabilization, but
Mechanical strength declines more apparent.
This patent substitutes part spherical titanium dioxide by by plate-like titanium dioxide, makes plate-like titanium dioxide with spherical dioxy
Change titanium compounding mixing and reflect filler as light, compared with spherical titanium dioxide is used alone as light reflection filler, the light of preparation
The reflectivity of reflected P C thin-film materials is significantly improved, and the mechanical strength of light reflected P C thin-film materials is improve, in reflectivity
In the case of identical, the usage amount of titanium dioxide is reduced, reduce production cost.
The bound of each raw material of the present invention, interval value, and titanium dioxide diameter, particle diameter, thickness bound, interval
Value can realize the present invention, embodiment numerous to list herein.
Claims (2)
1. a kind of high light reflectivity PC thin-film materials, it is characterised in that it is by titanium dioxide compound, makrolon (PC) and diformazan
Base silicone oil raw material is constituted；Mass percent shared by described each raw material is：Titanium dioxide compound 20%-28%, PC71%-
79%th, dimethicone 1%, mass percent sum shared by each raw material is 100%；Titanium dioxide compound is by sheet titanium dioxide
Titanium and spherical titanium dioxide raw material are constituted, and sheet and spherical titanium dioxide crystal formation are rutile-type；Plate-like titanium dioxide it is flat
A diameter of 15-25 μm, average thickness is 0.2-0.5 μm, and average aspect ratio is 40-120；The average grain diameter of spherical titanium dioxide
It is 0.2-0.4 μm；In titanium dioxide compound, plate-like titanium dioxide ratio is 50%-75%, spherical titanium dioxide ratio is
It is 100% that 25%-50%, spherical titanium dioxide and plate-like titanium dioxide account for titanium dioxide compound mass percent sum.
2. the preparation method of a kind of high light reflectivity PC thin-film materials according to claim 1, it is characterised in that it includes
Following steps：
(1) preparation of titanium dioxide compound：Plate-like titanium dioxide is well mixed with spherical titanium dioxide with high-speed mixer,
Prepare titanium dioxide compound；
(2) preparation of high light reflectivity PC thin-film materials：Titanium dioxide compound, PC and dimethicone prepared by step (1)
Mixing, is extruded with double screw extruder, granulated, dried, and prepares high light reflectivity PC thin-film materials.
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| CN109504061A (en) * | 2018-12-27 | 2019-03-22 | 苏州荣昌复合材料有限公司 | A kind of PC material with high light reflectivity |
| CN109968769A (en) * | 2019-03-29 | 2019-07-05 | 中国科学院上海技术物理研究所 | A kind of low-cost large-area Non-energy-consumption radiation refrigeration laminated film and preparation method |
| CN111704791A (en) * | 2020-06-03 | 2020-09-25 | 大韩化工工业高性能材料(东莞)有限公司 | Light-guiding light-diffusing PC material and preparation method thereof |
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