CN108732665A - A kind of scratch resistant diffusion barrier, backlight module and liquid crystal display - Google Patents
A kind of scratch resistant diffusion barrier, backlight module and liquid crystal display Download PDFInfo
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- CN108732665A CN108732665A CN201710243401.3A CN201710243401A CN108732665A CN 108732665 A CN108732665 A CN 108732665A CN 201710243401 A CN201710243401 A CN 201710243401A CN 108732665 A CN108732665 A CN 108732665A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0221—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having an irregular structure
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- Optics & Photonics (AREA)
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses a kind of scratch resistant diffusion barriers, backlight module and liquid crystal display, the scratch resistant diffusion barrier includes base material, be arranged base material one side diffusion layer and the back coating in base material another side is set, diffusion layer includes the first acrylic resin, first diffusion particle and the first curing agent, the glass transition temperature of first acrylic resin is less than 50 DEG C, the grain size of first diffusion particle is 5~20 μm, and include the different polymethyl methacrylate of at least two grain sizes, wherein the maximum polymethyl methacrylate of grain size is middle dispersed particle, grain size value for coefficient of variation is 15~30%.The scratch resistant diffusion barrier of the present invention, the component that anti-scratch can have not only contacted, but also can ensure itself to be not easy to be scraped off, it is scratch resistant to have excellent performance, it can be applied in backlight module and liquid crystal display.
Description
Technical field
The invention belongs to diffusion barrier fields, and in particular to a kind of scratch resistant diffusion barrier, backlight module and liquid crystal display.
Background technology
LCD technology (LCD, Liquid Crystal Display) because showing with right angle, low power consumption, volume
The advantages that small, has become the most common display technology of today's society.Liquid crystal display main member includes：Backlight module
(Backlight Unit, hereinafter referred to as BLU), liquid crystal display panel (Panel) control and peripheral circuits, connector, the encapsulation such as driving
Material etc..
The construction of Panel be liquid crystal is placed among the parallel glass of two panels, then respectively above the front of glass and
Polaroid (Polarizing Film, hereinafter referred to as POL) is pasted in the bottom surface of lower section glass, and the POL for being located above glass front claims
It is known as lower POL for upper POL, the POL for being located at lower section glass bottom surface.The effect of BLU is to provide backlight for non-luminous LCD itself
Source is one of the key part and component that backlight module is panel of LCD.BLU includes all kinds of optical films, usually from top to bottom
It is upper diffusion barrier, prism, lower diffusion barrier, light guide plate, reflector plate, side light source or directly-down light source successively.Positioned at BLU top layers
The effect of upper diffusion barrier (hereinafter referred to as upper expand) be protection prism, improve visual angle, Newton's ring, interference fringe is mitigated or eliminated etc.
Bad phenomenon and briliancy is improved when arranging in pairs or groups prism use, therefore is usually to the appearance requirement of upper expansion：Bad defect is few, has
There are certain shielding, optical performance requirements to be：Mist degree Haze is low, usually 60~85% or so, total light transmittance T.T
Height, usually 85%~95% or so.
The lower POL of Panel is contacted with the upper diffusion layer phase expanded in BLU.Durings LCD assemblings, carrying, vibration test etc.
It easily causes to expand the phase mutual friction with lower POL, especially 50 inches or more large scale liquid crystal displays, due in liquid crystal display panel
Portion lacks support, is easy to collapse, and increases the probability that down polaroid rubs with upper diffusion barrier, whether POL or upper expansion
It is impaired all to influence display imaging effect, product qualification rate is reduced, manufacturing cost is increased.
Anti-scratch diffusion barrier in the prior art generally selects Vinalac 5920 (PBMA) or nylon
(nylon) the soft particle of material has preferably elasticity than common polymethyl methacrylate (PMMA) particle, can certain journey
The probability that diffusion barrier layer scratches the other the components such as light guide plate, polaroid that contact in an lcd, but soft grain are reduced on degree
Son itself is softer, and diffusion barrier itself is easily scraped off.Another relatively conventional technology for preparing anti-scratch diffusion barrier is to increase diffusion
The hardness of membrane coat.Diffusion barrier either is prepared using UV-cured resin using the higher resin of glass transition temperature,
For this kind of diffusion barrier layer hardness generally up to H or 2H, 3H, the anti-scratch performance of diffusion barrier itself can be improved in this scheme, can solve
Certainly diffusion barrier rubs impaired problem during cutting, packing, transport etc., but diffusion barrier layer hardness is too high can scratch instead
The other optical modules contacted, such as light guide plate, prism, polaroid.
As stated above, existing optical diffusion exists and is difficult to take into account other anti-scratch contact assemblies, and can ensure certainly
Body is not easy the problem of being scraped off.
Invention content
It is an object of the present invention to provide a kind of scratch resistant diffusion barriers, are applied to liquid crystal display, both can be anti-scratch
The component contacted such as light guide plate, prism, polaroid, and can ensure itself to be not easy to be scraped off.
To achieve the goals above, the present invention provides a kind of scratch resistant diffusion barrier, including base material, it is arranged in base material one side
Diffusion layer includes the first acrylic resin, the first diffusion particle and first with the back coating in base material another side, diffusion layer is arranged
The glass transition temperature of curing agent, the first acrylic resin is less than 50 DEG C, and the grain size of the first diffusion particle is 5~20 μm, and
Including the maximum polymethyl methacrylate of the polymethyl methacrylate that at least two grain sizes are different, wherein grain size is middle dispersion
Particle, grain size value for coefficient of variation are 15~30%.
Further, the particle intensity of polymethyl methacrylate is 24~30MPa.
Further, the weight ratio that middle dispersed particle accounts for the first diffusion particle is 0.18~1.
Further, the weight ratio of the first diffusion particle and the first acrylic resin is 0.23~0.3.
Further, the degree of cross linking of the first diffusion particle is 30~35%.
Further, the thickness of diffusion layer is 10~25 μm, and the thickness of the back coating is 3~7 μm.
Further, back coating includes the second acrylic resin, the second diffusion particle and the second curing agent.
In addition, to achieve the above object, the present invention provides a kind of backlight modules, including upper diffusion barrier, prism, lower diffusion
Film, light guide plate, reflector plate, light source, the upper diffusion barrier and/or the lower diffusion barrier are above-mentioned scratch resistant diffusion barrier.
The present invention also provides liquid crystal display, including backlight module, liquid crystal display panel, the backlight module is the above-mentioned back of the body
Optical mode group.
The present invention also provides liquid crystal displays, including backlight module, liquid crystal display panel, it is characterised in that：The backlight mould
Group includes upper diffusion barrier, prism, lower diffusion barrier, light guide plate, reflector plate, light source, and the upper diffusion barrier of at least described backlight module is
Scratch resistant diffusion barrier described above, and the upper diffusion barrier is close to the side of liquid crystal display panel.
Compared with prior art, the present invention has the advantages that：
1, in the first acrylic resin of soft toughness and big grain size of the present invention using glass transition temperature less than 50 DEG C
The scratch resistant diffusion barrier that the polymethyl methacrylate of dispersion is prepared can support a more flat contacting surface, with its
When his component touch, more scratch caused by the concaveconvex structure of diffusion barrier is avoided, and can ensure itself to be not easy to be scraped off.
2, the present invention uses the PMMA particles of high-crosslinking-degree, has better solvent resistance compared with common degree of cross linking particle
Can, when particle is mixed with acrylic resin, solvent, it is not easy dilatancy, sphericity is higher, it is possible to reduce to other contact groups
Part, such as the scratch of polaroid.
Description of the drawings
The Figure of description for constituting the part of the present invention is used to provide further understanding of the present invention, and of the invention shows
Meaning property embodiment and its explanation are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 shows the scratch resistant diffusion membrane structure diagram of the present invention；
Fig. 2 shows the back light module unit structure schematic diagrames of the present invention；
Fig. 3 shows the part-structure schematic diagram of the liquid crystal display of the present invention；
Wherein, 10 be base material, and 20 be diffusion layer, and 30 be back coating, and 1 is scratch resistant diffusion barrier, and 2 be prism, and 3 be light guide plate, 4
It is light source for reflector plate, 5,6 be down polaroid.
Specific implementation mode
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The every other embodiment that member is obtained without making creative work should all belong to the model that the present invention protects
It encloses.
It should be noted that term " first " in description and claims of this specification and above-mentioned attached drawing, "
Two ", "upper", "lower" etc. are for distinguishing similar object, without being used to describe specific sequence or precedence.It should manage
The data that solution uses in this way can be interchanged in the appropriate case, so as to the embodiment of the present invention described herein.In addition, term
" comprising " and " having " and their any deformation, it is intended that cover it is non-exclusive include, for example, containing a series of steps
Rapid or unit process, method, system, product or equipment those of are not necessarily limited to clearly to list step or unit, but can
Including not listing clearly or for these processes, method, product or equipment intrinsic other steps or unit.
By background technology it is found that the presence of existing optical diffusion is difficult to take into account the anti-scratch component contacted, such as lead
Tabula rasa, prism, polaroid etc., and can ensure the problem of itself is not easy to be scraped off.The present inventor is regarding to the issue above
It is studied, it is proposed that a kind of scratch resistant diffusion barrier 1, as shown in Figure 1, including base material 10, the diffusion layer 20 in base material one side being arranged
With the back coating 30 in base material another side is set, diffusion layer includes the first acrylic resin, the first diffusion particle and the first solidification
The glass transition temperature of agent, the first acrylic resin is less than 50 DEG C, and the grain size of the first diffusion particle is 5~20 μm, and includes
The different polymethyl methacrylate of at least two grain sizes, the wherein maximum polymethyl methacrylate of grain size are middle dispersible granule
Son, grain size value for coefficient of variation are 15~30%.
Above-mentioned middle dispersed particle refers to a kind of particle that particle diameter is distributed between polydispersion and monodisperse particle,
Grain size coefficient of variation CV values are 15~30%.Using dispersed particle in the big grain size of the CV values, more points wide compared to particle diameter distribution
Shot can support a more flat contacting surface, be avoided when being contacted with other assemblies caused by the concaveconvex structure of diffusion barrier
More scratch, while also making diffusion barrier that there is 90% or more superelevation penetrance, it is used as upper diffusion barrier in collocation prism
When have higher briliancy.
Above-mentioned base material is the common optical grade thin polymer film in this field, can be polyethylene terephthalate
(PET), polyethylene naphthalate (PEN), polycarbonate resin (PC), acrylic resin etc..Preferably poly- terephthaldehyde
Sour glycol ester (PET).
Above-mentioned first acrylic resin is common soft toughened resin in the art, and glass transition temperature (Tg) is less than
50 DEG C, as love respects the acrylic resin AA-911, AOF-2700 etc. of chemistry.Generally, the painting prepared using the higher resin of Tg points
Layer hardness is higher, using the resin of above-mentioned Tg points, has certain soft toughness, can reduce the hardness of diffusion layer, prevent from scraping
Hinder other contact assemblies.
The polymethyl methacrylate (PMMA) of the present invention compares Vinalac 5920 (PBMA) or nylon
(nylon) the soft particle of material has certain intensity, diffusion barrier can be prevented to be scraped off to a certain extent, while will not
Scratch adjacent film layer.Preferably, PMMA particle intensities are 24~30MPa, and the scratch resistant performance of PMMA particles of the intensity is more excellent
It is different.
Above-mentioned first curing agent is the common isocyanate curing agent in this field, can be with the first acrylate of the present invention
Heat cure reaction occurs.The coating of above-mentioned diffusion layer further includes dispersant, levelling agent, solvent etc..The dispersant is this field
Interior common dispersant, such as BYK111；Levelling agent, such as BYK333, details are not described herein.Above-mentioned solvent is ethyl acetate, second
Two or more mixture in acid butyl ester, butanone, cyclohexanone.
In the preferred embodiment of the present invention, middle dispersed particle account for the first diffusion particle weight ratio be 0.18~
1, above-mentioned first diffusion particle in addition to containing middle dispersed particle, can also containing monodisperse particle, polydisperse particle one kind or
It is a variety of.
Further, in embodiments of the present invention, the solid content of acrylic resin is 47~50%, the first diffusion grain
The weight ratio of son and the first acrylic resin is 0.23~0.3, and content is limited within the above range, mist degree 80% can be obtained
~90%, the diffusion barrier that full light transmission rate is 90%~94% may be used as the upper diffusion barrier of backlight module, diffusion barrier exists on this
It, can anti-scratch liquid crystal display when being contacted with the down polaroid of liquid crystal display.
It is preferably carried out in mode in the another kind of the present invention, above-mentioned polymethyl methacrylate is the grain of high-crosslinking-degree
Son, the degree of cross linking are 30~35%.If the degree of cross linking easily generates dilatancy less than 30%, PMMA particles with solvent action；If handing over
Higher than 35%, PMMA particles, then difficulty is effectively dispersed in coating connection degree.Using the PMMA of 30~35% high-crosslinking-degrees of the invention
Particle has better solvent resistance compared with common degree of cross linking particle, when particle is mixed with acrylic resin, solvent,
It is not easy dilatancy, sphericity is higher, it is possible to reduce the scratch to other contact assemblies.
The scratch resistant diffusion barrier back coating of the present invention includes the second acrylic resin, the second diffusion particle, the second curing agent, above-mentioned
Second acrylic resin, the second diffusion particle, the second curing agent are the common resin in this field, particle and curing agent, herein
It repeats no more.
Antistatic agent can also be added in above-mentioned back coating, make scratch resistant diffusion barrier that there is certain antistatic property, it is described
Antistatic agent is the common substance in this field.
The diffusion layer preparation process of the scratch resistant diffusion barrier of the present invention is as follows：After base material unreels, cleaned by Roller for sticking dust
Afterwards to head region is applied, will be mixed in advance by the first diffusion particle, the first solvent, the first acrylic resin, first curing agent etc.
Coating fluid the one side of base material is coated on using dimple roller, coating fluid is solidificated in base by drying baking oven solvent flashing
The one side of material forms diffusion layer, diffusion barrier semi-finished product is obtained using winding.
The above-mentioned diffusion layer coating optional mesh number of dimple roller has 50 mesh, 60 mesh, 70 mesh, 80 mesh, 90 mesh.The definition of mesh number is
Wire casing quantity in per inch length.It is specific to select mesh number be according to the solid content of entire coating fluid, and the smearing that designs in advance
Amount determines.The baking oven length 20-60m, preferably five section segmentation baking ovens, the temperature setting range of baking oven is 70-110 DEG C, raw
Produce speed 15-20m/min.
The preparation process of the back coating of scratch resistant diffusion barrier is as follows：Film semi-finished product have been diffused after unreeling, have been passed through
It crosses after Roller for sticking dust cleaning to head region is applied, it will be in advance by mixing such as the second acrylic resin, the second diffusion particle, the second curing agent
After good coating fluid is coated on base material another side using the dimple roller that mesh number is 110, by drying oven solvent flashing, it will apply
Cloth liquid is solidificated in the another side of base material, forms back coating, diffusion barrier finished product is obtained using winding.The baking oven length 20-
60m, preferably five section segmentation baking ovens, the temperature setting range of baking oven is 70-110 DEG C, speed of production 15-35m/min.
The present invention also provides a kind of backlight module and liquid crystal displays, as shown in Fig. 2, the backlight module includes upper diffusion
Film, prism 2, lower diffusion barrier, light guide plate 3, reflector plate 4, light source 5 etc., above-mentioned scratch resistant diffusion barrier 1 may serve as backlight module
In upper diffusion barrier and/or lower diffusion barrier.Liquid crystal display as shown in Figure 3, including backlight module and down polaroid 6, when upper
The scratch resistant diffusion barrier 1 stated is when being used as the upper diffusion barrier of backlight module, it is ensured that the down polaroid 6 of liquid crystal display is not scraped
Wound, improves the display performance of liquid crystal display.
Below with reference to embodiment and comparative example, the advantageous effect that further illustrates the present invention.Obviously, described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without making creative work belongs to the model that the present invention protects
It encloses.
Embodiment 1
A kind of scratch resistant diffusion barrier 1, as shown in Figure 1, including base material 10, be arranged base material one side diffusion layer 20 and setting exist
The back coating 30 of base material another side.Diffusion layer is formed by curing by the coating fluid of following components in substrate surface coating.Coating fluid group
It is divided into：The acrylic resin AA-911 (love respects chemical manufacture, about 40 DEG C of TG points) of 22 parts by weight, 5 μm of polydispersion of 3.2 parts by weight
PMMA particles (CV values 40%), dispersion PMMA particles (CV values 30%), the acetic acid second of 12 parts by weight in 15 μm of 0.5 parts by weight
Ester, the butyl acetate of 18 parts by weight, the isocyanate curing agent of 1.3 parts by weight, the dispersant B YK-111 of 0.2 parts by weight, 0.05
The levelling agent BYK333 of parts by weight.Wherein, the particle intensity of PMMA diffusion particles composition is 20MPa, and the degree of cross linking 25% expands
The thickness for dissipating layer is 10 μm, and back coating thickness is 3 μm.
Embodiment 2
A kind of scratch resistant diffusion barrier, including base material, be arranged base material one side diffusion layer and the back of the body in base material another side is set
Coating.Diffusion layer is formed by curing by the coating fluid of following components in substrate surface coating.Coating fluid group is divided into：The third of 48 parts by weight
Olefin(e) acid Resin A A-911 (love respects chemical manufacture, about 40 DEG C of TG points), 5 μm of polydispersion PMMA particle (CV values of 5.0 parts by weight
45%), 10 μm of monodisperse PMMA particles (CV values 3%) of 4.1 parts by weight disperse PMMA particle (CV values in 20 μm of 2 parts by weight
15%), the ethyl acetate of 20 parts by weight, the butyl acetate of 30 parts by weight, the isocyanate curing agent of 2.3 parts by weight, 0.2 weight
The dispersant B YK-111,0.05 parts by weight levelling agent BYK333 of part.Wherein, the particle intensity of PMMA diffusion particles composition is
The thickness of 24MPa, the degree of cross linking 32%, diffusion layer are 15 μm, and back coating thickness is 7 μm.
Embodiment 3
A kind of scratch resistant diffusion barrier, including base material, be arranged base material one side diffusion layer and the back of the body in base material another side is set
Coating.Diffusion layer is formed by curing by the coating fluid of following components in substrate surface coating.Coating fluid group is divided into：The third of 19 parts by weight
Olefin(e) acid Resin A OF-2023 (love respects chemical manufacture, about 46.1 DEG C of TG points), 5 μm of polydispersion PMMA particle (CV values of 2.3 parts by weight
50%), disperse PMMA particles (CV values 20%), the ethyl acetate of 12 parts by weight, the second of 18 parts by weight in 15 μm of 2.4 parts by weight
Acid butyl ester, the isocyanate curing agent of 2.3 parts by weight, the dispersant B YK-111 of 0.2 parts by weight, the levelling agent of 0.05 parts by weight
BYK333.Wherein, the particle intensity of PMMA diffusion particles composition is 28MPa, and the thickness of the degree of cross linking 35%, diffusion layer is 12
μm, back coating thickness is 5 μm.
Embodiment 4
A kind of scratch resistant diffusion barrier, including base material, be arranged base material one side diffusion layer and the back of the body in base material another side is set
Coating.Diffusion layer is formed by curing by the coating fluid of following components in substrate surface coating.Coating fluid group is divided into：The third of 19 parts by weight
Olefin(e) acid Resin A OF-2023 (love respects chemical manufacture, about 46.1 DEG C of TG points) disperses PMMA particle (CV values in 5 μm of 1.5 parts by weight
22%), disperse PMMA particles (CV values 20%) in 8 μm of 2 parts by weight, disperse PMMA particle (CV values in 20 μm of 2.2 parts by weight
18%), the ethyl acetate of 12 parts by weight, the butyl acetate of 18 parts by weight, the isocyanate curing agent of 2.3 parts by weight, 0.2 weight
The dispersant B YK-111, the levelling agent BYK333 of 0.05 parts by weight of part.Wherein, the particle intensity of PMMA diffusion particles composition
Thickness for 30MPa, the degree of cross linking 30%, diffusion layer is 18 μm, and back coating thickness is 5 μm.
Comparative example 1
A kind of scratch resistant diffusion barrier, including base material, be arranged base material one side diffusion layer and the back of the body in base material another side is set
Coating.Diffusion layer is formed by curing by the coating fluid of following components in substrate surface coating.Coating fluid group is divided into：The third of 22 parts by weight
Olefin(e) acid resin DIC TAB800 (DIC is manufactured, about 90 DEG C of TG), 5 μm of polydispersion PMMA particles (CV values 40%) of 3.2 parts by weight,
15 μm of polydispersion PMMA particles (CV values 40%) of 0.5 parts by weight, the ethyl acetate of 12 parts by weight, the acetic acid fourth of 18 parts by weight
Ester, the isocyanate curing agent of 1.3 parts by weight, the dispersant B YK-111 of 0.2 parts by weight, the levelling agent of 0.05 parts by weight
BYK333.Wherein, the particle intensity of PMMA diffusion particles composition is 20MPa, and the thickness of the degree of cross linking 25%, diffusion layer is 10
μm, back coating thickness is 3 μm.
Comparative example 2
A kind of scratch resistant diffusion barrier, including base material, be arranged base material one side diffusion layer and the back of the body in base material another side is set
Coating.Diffusion layer is formed by curing by the coating fluid of following components in substrate surface coating.Coating fluid group is divided into：The third of 22 parts by weight
Olefin(e) acid Resin A LMATEX HC164 (Mitsui Chemicals, 100 DEG C of TG), 5 μm of Vinalac 5920 PBMA of 3.2 parts by weight
Particle, 15 μm of Vinalac 5920 PBMA particles of 0.5 parts by weight, the ethyl acetate of 12 parts by weight, 18 parts by weight
Butyl acetate, the isocyanate curing agent of 1.3 parts by weight, the dispersant B YK-111 of 0.2 parts by weight, the levelling of 0.05 parts by weight
Agent BYK333.
Comparative example 3
A kind of scratch resistant diffusion barrier, including base material, be arranged base material one side diffusion layer and the back of the body in base material another side is set
Coating.Diffusion layer is formed by curing by the coating fluid of following components in substrate surface coating.Coating fluid group is divided into：The third of 22 parts by weight
Olefin(e) acid Resin A LMATEX HC164 (Mitsui Chemicals, 100 DEG C of TG), 5 μm of nylon particles of 3.2 parts by weight, the 15 of 0.5 parts by weight
μm nylon particle, the ethyl acetate of 12 parts by weight, the butyl acetate of 18 parts by weight, the isocyanate curing agent of 1.3 parts by weight,
The dispersant B YK-111 of 0.2 parts by weight, the levelling agent BYK333 of 0.05 parts by weight.
According to ASTM-D3363 pencil hardness test Standard Test Methods, using Mitsubishi's pencil, peace Tian Jingji pencil hardometers,
500g counterweight Road tests test the hardness of above-mentioned scratch resistant diffusion barrier.Using scratch-resistant tester, by above-mentioned scratch resistant diffusion barrier with
Other assemblies contact, and connection to load counterweight horizontally slips test, by assembly surface flashlight observation diffusion barrier and contacted
Whether there is scratch, and is assessed according to following standard：
Diaphragm is calculated as " ◎ " without scratch,
The a small amount of Slight abrasion marks of diaphragm are calculated as "○",
The a large amount of scratches of diaphragm are calculated as " ╳ ".
Test result is as follows shown in table：
| Hardness | The scratch resistant diffusion barrier scratch resistance of itself | The resistance to scraping of other assemblies | |
| Embodiment 1 | H | ○ | ○ |
| Embodiment 2 | H | ◎ | ○ |
| Embodiment 3 | H | ◎ | ◎ |
| Embodiment 4 | H | ◎ | ◎ |
| Comparative example 1 | 2H | ◎ | ╳ |
| Comparative example 2 | 3B | ╳ | ○ |
| Comparative example 3 | 3B | ╳ | ○ |
By above example and comparative example it is found that soft toughness the of the present invention using glass transition temperature less than 50 DEG C
The scratch resistant diffusion barrier that the PMMA diffusion particles disperseed in one acrylic resin and big grain size are prepared can support one more
Flat contacting surface avoids more scratch caused by the concaveconvex structure of diffusion barrier, and can ensure when being contacted with other assemblies
Itself it is not easy to be scraped off.Further, when the degree of cross linking of the first diffusion particle is between 30~35%, the scratch resistant property of diffusion barrier
It can be more preferably.
It should be noted that specific implementation mode is only the explanation to technical solution of the present invention, should not be managed
Solution is restriction to technical solution of the present invention, any only to make locally to change using the substantive invention content of the present invention, Reng Yingluo
Enter in protection scope of the present invention.
Claims (10)
1. a kind of scratch resistant diffusion barrier, including base material (10), be arranged it is another in base material in the diffusion layer (20) of base material one side and setting
The back coating (30) in face, it is characterised in that：The diffusion layer (20) includes the first acrylic resin, the first diffusion particle and first
Curing agent, the glass transition temperature of first acrylic resin are less than 50 DEG C, and the grain size of first diffusion particle is 5~
20 μm, and include the different polymethyl methacrylate of at least two grain sizes, the wherein maximum polymethyl methacrylate of grain size
For middle dispersed particle, grain size value for coefficient of variation is 15~30%.
2. scratch resistant diffusion barrier according to claim 1, it is characterised in that：The particle intensity of the polymethyl methacrylate
For 24~30MPa.
3. scratch resistant diffusion barrier according to claim 1, it is characterised in that：The middle dispersed particle accounts for the first diffusion grain
The weight ratio of son is 0.18~1.
4. scratch resistant diffusion barrier according to claim 1, it is characterised in that：First diffusion particle and first propylene
The weight ratio of acid resin is 0.23~0.3.
5. scratch resistant diffusion barrier according to claim 1, it is characterised in that：The degree of cross linking of first diffusion particle be 30~
35%.
6. scratch resistant diffusion barrier according to claim 1, it is characterised in that：The thickness of the diffusion layer is 10~25 μm, institute
The thickness for stating back coating is 3~7 μm.
7. scratch resistant diffusion barrier according to claim 1, it is characterised in that：The back coating include the second acrylic resin,
Second diffusion particle and the second curing agent.
8. a kind of backlight module, including upper diffusion barrier, prism, lower diffusion barrier, light guide plate, reflector plate, light source, it is characterised in that：
The upper diffusion barrier and/or the lower diffusion barrier are the scratch resistant diffusion barrier described in claim 1~7 any one.
9. a kind of liquid crystal display, including backlight module, liquid crystal display panel, it is characterised in that：The backlight module is claim 8
The backlight module.
10. a kind of liquid crystal display, including backlight module, liquid crystal display panel, it is characterised in that：The backlight module includes upper diffusion
The upper diffusion barrier of film, prism, lower diffusion barrier, light guide plate, reflector plate, light source, at least described backlight module is claim 1~7
Scratch resistant diffusion barrier described in any one, and the upper diffusion barrier is close to the side of the liquid crystal display panel.
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Application publication date: 20181102 |