CN109280556A - A method of polymer dispersed liquid-crystal film is prepared based on epoxy substep heat cure - Google Patents
A method of polymer dispersed liquid-crystal film is prepared based on epoxy substep heat cure Download PDFInfo
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Abstract
The present invention relates to liquid crystal material applied technical fields, more particularly to a kind of method for preparing polymer dispersed liquid-crystal film based on epoxy substep heat cure.The following steps are included: 1) mix in proportion non-liquid crystal property epoxy monomer, liquid crystal liquid crystal property epoxy monomer, polythiol monomer, liquid crystal and promotor, mixture is circulated into liquid crystal cell, obtains sample；2) sample for obtaining step 1) carries out preliminary heat cure；3) sample for obtaining step 2) carries out secondary heat cure: applying electric field to sample, continues to solidify, obtains polymer stabilized nematic liquid crystals and the film of system coexists in polymer dispersed liquid crystals.Epoxy/the polymer, thiol obtained after solidification has preferable adhesion strength, stability and mechanical performance, is conducive to the practical value for improving PDLC.Meanwhile the regulation to polymer dispersed liquid crystal film electro-optical properties may be implemented based on this method, be conducive to the driving voltage and response speed that further improve polymer dispersed liquid-crystal film.
Description
Technical field
The present invention relates to liquid crystal material applied technical fields, poly- based on epoxy substep heat cure preparation more particularly to one kind
The method for closing object dispersed liquid-crystal film.This method can be used for regulating and controlling the electro-optical properties of heat curing copolymer dispersed LCD, from
And a kind of feasible approach is provided to prepare the polymer dispersed liquid-crystal film of low driving voltage.
Background technique
Polymer dispersed liquid-crystal film (Polymer Dispersed Liquid Crystal, hereinafter referred to as PDLC) is one
The important liquid crystal/polymer composite materials of kind, due to the special electrooptical property of liquid crystal, the transmitance of this film can be by additional
Electric field controls, so that light scattering states and light can be realized through the variation between state.In PDLC, liquid crystal is mainly in the form of droplet
It is uniformly distributed in the polymer matrix.When being not powered on, liquid crystal molecule random alignment.Under this state, due to liquid crystal region
Refractive index and polymer substrate refractive index between have a certain difference, PDLC present light scattering states.And it is certain when applying
The electric field of intensity, liquid crystal by electric field force effect perpendicular to substrate arrangement.At this point, the ordinary index of refraction and polymer substrate of liquid crystal
Refractive index match, it is seen that light can penetrate film, thus PDLC is changed into light through state.This special electrooptical property,
So that PDLC intelligent glass, large-area displays, holographic recording, optical projection system, in terms of have very
Important application value.
And in order to the commercialization of PDLC is better achieved, the PDLC for preparing low driving voltage becomes educational circles and industrial circle is ground
The hot spot studied carefully.In general, the Electrical Safety in order to consider user, the saturation voltage of PDLC should not be more than 36V.In order to reduce
The saturation voltage of PDLC, in the past, many researchs concentrate on doped nano-material, doping surfaces activating agent, the dielectric for improving liquid crystal
Property etc..But these methods often put forward higher requirements material.And new preparation process is probed into, become
With more the approach of the reduction PDLC driving voltage of realistic meaning.
On the other hand, epoxy thermosetting method, which becomes, prepares a kind of one of important method of PDLC.Work is prepared with other
Skill is compared, and monomer volatility used in thermal curing methods is small, and toxicity is low.Meanwhile obtained converging network shrinking percentage is low,
And it there's almost no the xanthochromia problem of film.More importantly epoxy polymer has excellent chemical resistance, electrical isolation
Property, adhesion strength and mechanical performance, and be very suitable to large area production, this promotes the quotient of PDLC to the mechanical property for improving PDLC
Industry has important practical significance.In addition, polymer substrate of epoxy/amine polymer used also as PDLC.However, epoxy
Solidification with amine needs very high temperature, while being fully cured and being also required to take a long time, this is unfavorable for improving PDLC system
Standby production efficiency.
Summary of the invention
The object of the present invention is to provide a kind of sides that polymer dispersed liquid-crystal film is prepared based on epoxy substep heat cure
Method, this method can be used for regulating and controlling the electro-optical properties of heat curing copolymer dispersed LCD, thus to prepare low driving voltage
Polymer dispersed liquid-crystal film provides a kind of feasible approach.Preparation method utilizes non-liquid crystal property epoxy monomer and liquid crystal liquid crystal property ring
The activity difference of oxygen monomer, thermal polymerization at a certain temperature, can make most of non-liquid crystal epoxies first with polythiol monomer
It is formed by curing the polymer substrate of polymer dispersed liquid crystals.And since the curing activity of liquid crystal liquid crystal property epoxy monomer is small, by pre- solid
After change, there are still a certain number of liquid crystal liquid crystal property polymerized monomers in system.And by applying some strength electric field, liquid crystal liquid crystal property epoxy list
The arrangement of certain ordered degree can be presented in body together with liquid crystal under the electric field.By continuing to solidify for a long time, these can be made
Remaining non-liquid crystal property epoxy monomer forms the liquid crystal liquid crystal property epoxy network with certain orientation texture by reacting with sulfydryl.
With the degree of order that the liquid crystal liquid crystal property epoxy network being centainly orientated can make Formation of liquid crystals in its vicinity certain, so as to subtract
Energy required for small liquid crystal vertical orientation completely, thus may be implemented to reduce the effect of polymer dispersed liquid crystals driving voltage.
The specific technical solution of the present invention is as follows:
The present invention provides a kind of method for preparing polymer dispersed liquid-crystal film based on epoxy substep heat cure, including following
Step:
1) non-liquid crystal property epoxy monomer, liquid crystal liquid crystal property epoxy monomer, polythiol monomer, liquid crystal and promotor are mixed in proportion
It is even, mixture is circulated into liquid crystal cell, sample is obtained；
2) sample for obtaining step 1) carries out preliminary heat cure；
3) sample for obtaining step 2) carries out secondary heat cure: applying electric field to sample, continues to solidify, obtain polymer
The film of system coexists in stabilizing liquid crystal and polymer dispersed liquid crystals.
Wherein, the non-liquid crystal property epoxy monomer accounts for the 13.6%~21.7% of system gross mass, the liquid crystal liquid crystal property epoxy
Content of monomer accounts for the 0%~6% of system gross mass, and the polythiol monomer content accounts for the 24.4%~38.3% of system gross mass,
The liquid crystal content accounts for the 38.0%-59.0% of system gross mass, and the accelerator content accounts for the 1.0%- of system gross mass
2.0%.
Preferably, the non-liquid crystal property epoxy monomer includes ternary epoxide 4- (2,3- glycidoxy)-
N, N- bis- (2,3- glycidyl) aniline, binary epoxide polypropylene glycol diepoxide for example methyl ether and bisphenol-A epoxy tree
Rouge E44.
Preferably, the liquid crystal liquid crystal property epoxy monomer is E6M, and structure is as shown in Figure 1.
Preferably, the polythiol monomer is polymercaptan Capcure 3800, and sulfydryl value is 280g/mol.
Preferably, the liquid crystal is nematic liquid crystal E8.
Preferably, the promotor is 2,4,6- tri- (dimethylamino methyl) phenol.
Preferably, the thickness control of the liquid crystal cell is 19.0 ± 1.0 μm.
Preferably, made of the step 1) liquid crystal cell is coated with the electro-conductive glass of tin indium oxide with two panels.
Preferably, sample solidification temperature described in step 2) is 313.15K~353.15K, and sample curing time is
1.0~24.0h.
Preferably, the solidification of sample described in step 3) electric field strength is 0V~100V.
Preferably, sample solidification temperature described in step 3) is 313.15K~353.15K, and sample curing time is
2-7d。
Based on the method that epoxy substep heat cure prepares polymer dispersed liquid-crystal film, detailed process is as follows:
The film preparation is divided into two processes of preliminary heat cure and secondary heat cure.Firstly, sample carries out preliminary thermosetting
Change, specifically: sample is solidified into certain time at a certain temperature so that non-liquid crystal monomer and polythiol monomer polymerize to be formed it is poly-
Close the polymer substrate of object dispersed liquid-crystal film.Then, sample carries out secondary heat cure, specifically: apply to sample certain strong
Electric field is spent, and sample continues to solidify under the electric field, so that the polymer that remaining liquid crystal liquid crystal property epoxy monomer and precuring is formed
The reaction was continued for extra sulfydryl at matrix interface, and so as to form secondary network in liquid crystal region, it is steady that polymer is prepared
Determine liquid crystal and the film of system coexists in polymer dispersed liquid crystals.
Compared with prior art, present invention has an advantage that
The method of selection of the invention is simple and easy, is suitable for commodity production.And selected curing monomer is cheap,
Monomer does not have volatility, small toxicity.Epoxy/the polymer, thiol obtained after solidification has preferable adhesion strength, stability and machine
Tool performance is conducive to the practical value for improving PDLC.Meanwhile it may be implemented based on this method to polymer dispersed liquid crystal film electric light
The regulation of performance is conducive to the driving voltage and response speed that further improve polymer dispersed liquid-crystal film.
Detailed description of the invention
Fig. 1 is the structural formula of monomer and promotor used in the present invention and the related parameter of liquid crystal E8；
Fig. 2 is the electro-optical properties test result of the polymer dispersed liquid-crystal film of 1-3 of embodiment of the present invention preparation；
Fig. 3 is the electro-optical properties test result of the polymer dispersed liquid-crystal film of 4-6 of embodiment of the present invention preparation；
Fig. 4 is the electro-optical properties test result of the polymer dispersed liquid-crystal film of 7-8 of embodiment of the present invention preparation；
Fig. 5 is the electro-optical properties test result of the polymer dispersed liquid-crystal film of 9-10 of embodiment of the present invention preparation；
Fig. 6 is the electro-optical properties test result of polymer dispersed liquid-crystal film prepared by the embodiment of the present invention 11；
Fig. 7 is the electro-optical properties test result of polymer dispersed liquid-crystal film prepared by the embodiment of the present invention 12；
Fig. 8 is the electro-optical properties test result of polymer dispersed liquid-crystal film prepared by the embodiment of the present invention 13；
Fig. 9 is experimental principle figure of the present invention.
Specific embodiment
The present invention is further explained in the light of specific embodiments.
In the present invention, the percentage is all mass percent, and involved temperature is all absolute temperature, each symbol institute's generation
Table meaning is as follows:
ToffIndicate light transmission rate when PDLC OFF state, TonIndicate light transmission rate of the PDLC in the case where applying 100V electric field conditions,
VthIt indicates threshold voltage, refers to reaching T when PDLC light transmission rateon10% when required voltage, VsatIndicate saturation electricity
Pressure refers to reaching T when PDLC light transmission rateon90% when required voltage.CR indicates contrast, calculation method are as follows:
CR=Ton/Toff。
Embodiment 1
NDGA/E44/PGDE/E6M/Capcure 3800/E8/DMP-30 is mixed according to the mass fraction ratio of table 1,
After stirring, be circulated into two panels be coated with the electro-conductive glass of tin indium oxide made of in liquid crystal cell, liquid crystal
Box thickness control is 20.0um.Later, sample is firstly placed in thermal station solidify 1.0h at 333.15K.Later, apply to sample
100V extra electric field, sample continue to solidify 48h.After two-stage cure, available PDLC film.
The composition of sample in 1 embodiment 1 of table
The electro-optical properties curve of the PDLC film of above-mentioned preparation is measured with liquid crystal comprehensive parameter tester, as shown in Figure 2.
The main electro-optical properties of the polymer dispersed liquid-crystal film prepared by embodiment 1 are as shown in table 2.
The main electro-optical properties of the polymer dispersed liquid-crystal film of 2 embodiment 1 of table preparation
Embodiment 2
NDGA/E44/PGDE/E6M/Capcure 3800/E8/DMP-30 is mixed according to the mass fraction ratio of table 3,
After stirring, be circulated into two panels be coated with the electro-conductive glass of tin indium oxide made of in liquid crystal cell, liquid crystal
Box thickness control is 20.0um.Later, sample is firstly placed in thermal station solidify 1.0h at 333.15K.Later, apply to sample
100V extra electric field, sample continue to solidify 48h.After two-stage cure, available polymer dispersed liquid crystals and polymer stabilizing
The PDLC film of system coexists in liquid crystal.
The composition of sample in 3 embodiment 2 of table
The electro-optical properties curve of the PDLC film of above-mentioned preparation is measured with liquid crystal comprehensive parameter tester, as shown in Figure 2.
The main electro-optical properties of the polymer dispersed liquid-crystal film prepared by embodiment 2 are as shown in table 4.
The main electro-optical properties of the polymer dispersed liquid-crystal film of 4 embodiment 2 of table preparation
Embodiment 3
NDGA/E44/PGDE/E6M/Capcure 3800/E8/DMP-30 is mixed according to the mass fraction ratio of table 5,
After stirring, be circulated into two panels be coated with the electro-conductive glass of tin indium oxide made of in liquid crystal cell, liquid crystal
Box thickness control is 20.0um.Later, sample is firstly placed in thermal station solidify 1.0h at 333.15K.Later, apply to sample
100V extra electric field, sample continue to solidify 48h.After two-stage cure, available polymer dispersed liquid crystals and polymer stabilizing
The PDLC film of system coexists in liquid crystal.
The composition of sample in 5 embodiment 3 of table
The electro-optical properties curve of the PDLC film of above-mentioned preparation is measured with liquid crystal comprehensive parameter tester, as shown in Figure 2.
The main electro-optical properties of the polymer dispersed liquid-crystal film prepared by embodiment 3 are as shown in table 6.
The main electro-optical properties of the polymer dispersed liquid-crystal film of 6 embodiment 3 of table preparation
Pass through the interpretation of result obtained to embodiment 1-3, it can be seen that after liquid crystal liquid crystal property epoxy monomer is added in system,
The driving voltage of PDLC film can be reduced by curing method twice.But if liquid crystal liquid crystal property epoxy monomer too high levels, two
The liquid crystal liquid crystal property epoxy network that secondary heat cure is formed is excessive to liquid crystal anchoring effect, so that under OFF state, neighbouring liquid crystal liquid crystal property ring
Certain orientation can be still presented in the liquid crystal molecule of oxygen network.The OFF state transmitance that this will lead to PDLC film is excessively high, contrast
It reduces.Therefore, in order to obtain PDLC film more with practical value, it is necessary to the rationally content of control liquid crystal liquid crystal property epoxy monomer.
Preferably, liquid crystal liquid crystal property epoxy monomer content is 1.5%, and driving voltage is reduced than 1 sample of embodiment in embodiment 2
Very much, and it is able to maintain certain contrast.
Embodiment 4
NDGA/E44/PGDE/E6M/Capcure 3800/E8/DMP-30 is mixed according to the mass fraction ratio of table 7,
After stirring, be circulated into two panels be coated with the electro-conductive glass of tin indium oxide made of in liquid crystal cell, liquid crystal
Box thickness control is 20.0um.Later, sample is firstly placed in thermal station solidify 1.0h at 333.15K.Later, apply to sample
0V extra electric field, sample continue to solidify 48h.After two-stage cure, available PDLC film.
The composition of sample in 7 embodiment 4-10 of table
The electro-optical properties curve of the PDLC film of above-mentioned preparation is measured with liquid crystal comprehensive parameter tester, as shown in Figure 3.
The main electro-optical properties of the polymer dispersed liquid-crystal film prepared by embodiment 4 are as shown in table 8.
The main electro-optical properties of the polymer dispersed liquid-crystal film of 8 embodiment 4 of table preparation
Embodiment 5
NDGA/E44/PGDE/E6M/Capcure 3800/E8/DMP-30 is mixed according to the mass fraction ratio of table 7,
After stirring, be circulated into two panels be coated with the electro-conductive glass of tin indium oxide made of in liquid crystal cell, liquid crystal
Box thickness control is 20.0um.Later, sample is firstly placed in thermal station solidify 1.0h at 333.15K.Later, apply to sample
30V extra electric field, sample continue to solidify 48h.After two-stage cure, available polymer dispersed liquid crystals and polymer stabilizing liquid
The PDLC film of system coexists in crystalline substance.
The electro-optical properties curve of the PDLC film of above-mentioned preparation is measured with liquid crystal comprehensive parameter tester, as shown in Figure 3.
The main electro-optical properties of the polymer dispersed liquid-crystal film prepared by embodiment 5 are as shown in table 9.
The main electro-optical properties of the polymer dispersed liquid-crystal film of 9 embodiment 5 of table preparation
Embodiment 6
NDGA/E44/PGDE/E6M/Capcure 3800/E8/DMP-30 is mixed according to the mass fraction ratio of table 7,
After stirring, be circulated into two panels be coated with the electro-conductive glass of tin indium oxide made of in liquid crystal cell, liquid crystal
Box thickness control is 20.0um.Later, sample is firstly placed in thermal station solidify 1.0h at 333.15K.Later, apply to sample
100V extra electric field, sample continue to solidify 48h.After two-stage cure, available polymer dispersed liquid crystals and polymer stabilizing
The PDLC film of system coexists in liquid crystal.
The electro-optical properties curve of the PDLC film of above-mentioned preparation is measured with liquid crystal comprehensive parameter tester, as shown in Figure 3.
The main electro-optical properties of the polymer dispersed liquid-crystal film prepared by embodiment 6 are as shown in table 10.
The main electro-optical properties of the polymer dispersed liquid-crystal film of 10 embodiment 6 of table preparation
Pass through the interpretation of result to embodiment 4-6, it can be seen that, can be outer by adjusting in secondary curing process
It is powered on the PDLC film that field intensity obtains different performance.
Embodiment 7
NDGA/E44/PGDE/E6M/Capcure 3800/E8/DMP-30 is mixed according to the mass fraction ratio of table 7,
After stirring, be circulated into two panels be coated with the electro-conductive glass of tin indium oxide made of in liquid crystal cell, liquid crystal
Box thickness control is 20.0um.Later, sample is firstly placed in thermal station solidify 1.0h at 313.15K.Later, apply to sample
100V extra electric field, sample continue to solidify 48h.After two-stage cure, available polymer dispersed liquid crystals and polymer stabilizing
The PDLC film of system coexists in liquid crystal.
The electro-optical properties curve of the PDLC film of above-mentioned preparation is measured with liquid crystal comprehensive parameter tester, as shown in Figure 4.
The main electro-optical properties of the polymer dispersed liquid-crystal film prepared by embodiment 7 are as shown in table 11.
The main electro-optical properties of the polymer dispersed liquid-crystal film of 11 embodiment 7 of table preparation
Embodiment 8
NDGA/E44/PGDE/E6M/Capcure 3800/E8/DMP-30 is mixed according to the mass fraction ratio of table 7,
After stirring, be circulated into two panels be coated with the electro-conductive glass of tin indium oxide made of in liquid crystal cell, liquid crystal
Box thickness control is 20.0um.Later, sample is firstly placed in thermal station solidify 1.0h at 353.15K.Later, apply to sample
100V extra electric field, sample continue to solidify 48h.After two-stage cure, available polymer dispersed liquid crystals and polymer stabilizing
The PDLC film of system coexists in liquid crystal.
The electro-optical properties curve of the PDLC film of above-mentioned preparation is measured with liquid crystal comprehensive parameter tester, as shown in Figure 4.
The main electro-optical properties of the polymer dispersed liquid-crystal film prepared by embodiment 8 are as shown in table 12.
The main electro-optical properties of the polymer dispersed liquid-crystal film of 12 embodiment 8 of table preparation
Pass through the interpretation of result to embodiment 6-8, it can be seen that the temperature of preliminary heat cure is also to influence PDLC film
An important factor for energy.As primary solidification temperature increases, the mesh in polymer dispersed structure that one-step solidification is formed is smaller, from
And system driving voltage is caused to increase.
Embodiment 9
NDGA/E44/PGDE/E6M/Capcure 3800/E8/DMP-30 is mixed according to the mass fraction ratio of table 7,
After stirring, be circulated into two panels be coated with the electro-conductive glass of tin indium oxide made of in liquid crystal cell, liquid crystal
Box thickness control is 20.0um.Later, sample is firstly placed in thermal station solidify 1.5h at 313.15K.Later, apply to sample
100V extra electric field, sample continue to solidify 48h.After two-stage cure, available polymer dispersed liquid crystals and polymer stabilizing
The PDLC film of system coexists in liquid crystal.
The electro-optical properties curve of the PDLC film of above-mentioned preparation is measured with liquid crystal comprehensive parameter tester, as shown in Figure 5.
The main electro-optical properties of the polymer dispersed liquid-crystal film prepared by embodiment 9 are as shown in table 13.
The main electro-optical properties of the polymer dispersed liquid-crystal film of 13 embodiment 9 of table preparation
Embodiment 10
NDGA/E44/PGDE/E6M/Capcure 3800/E8/DMP-30 is mixed according to the mass fraction ratio of table 7,
After stirring, be circulated into two panels be coated with the electro-conductive glass of tin indium oxide made of in liquid crystal cell, liquid crystal
Box thickness control is 20.0um.Later, sample is firstly placed in thermal station solidify 24.0h at 353.15K.Later, it is applied to sample
Add 100V extra electric field, sample continues to solidify 48h.After two-stage cure, available polymer dispersed liquid crystals and polymer are steady
Determine the PDLC film that system coexists in liquid crystal.
The electro-optical properties curve of the PDLC film of above-mentioned preparation is measured with liquid crystal comprehensive parameter tester, as shown in Figure 5.
The main electro-optical properties of the polymer dispersed liquid-crystal film prepared by embodiment 10 are as shown in table 14.
The main electro-optical properties of the polymer dispersed liquid-crystal film of 14 embodiment 10 of table preparation
Pass through the interpretation of result to embodiment 6,9 and 10, it can be seen that the time of preliminary heat cure is also influence PDLC thin
An important factor for film properties.As the primary solidification time extends, more liquid crystal liquid crystal property epoxy monomers also can be in preliminary heat cure rank
Section is reacted away, and system driving voltage is caused to increase.
Embodiment 11
NDGA/E44/PGDE/E6M/Capcure 3800/E8/DMP-30 is mixed according to the mass fraction ratio of table 15,
After stirring, be circulated into two panels be coated with the electro-conductive glass of tin indium oxide made of in liquid crystal cell, liquid crystal
Box thickness control is 20.0um.Later, sample is firstly placed in thermal station solidify 1.0h at 333.15K.Later, apply to sample
100V extra electric field, sample continue to solidify 48h.After two-stage cure, available PDLC film.
The composition of sample in 15 embodiment 11 of table
The electro-optical properties curve of the PDLC film of above-mentioned preparation is measured with liquid crystal comprehensive parameter tester, as shown in Figure 6.
The main electro-optical properties of the polymer dispersed liquid-crystal film prepared by embodiment 4 are as shown in table 16.
The main electro-optical properties of the polymer dispersed liquid-crystal film of 16 embodiment 11 of table preparation
Embodiment 12
NDGA/E44/PGDE/E6M/Capcure 3800/E8/DMP-30 is mixed according to the mass fraction ratio of table 7,
After stirring, be circulated into two panels be coated with the electro-conductive glass of tin indium oxide made of in liquid crystal cell, liquid crystal
Box thickness control is 20.0um.Later, sample is firstly placed in thermal station solidify 1.0h at 333.15K.Later, apply to sample
100V extra electric field, sample continue to solidify 148h.After two-stage cure, available polymer dispersed liquid crystals and polymer stabilizing
The PDLC film of system coexists in liquid crystal.
The electro-optical properties curve of the PDLC film of above-mentioned preparation is measured with liquid crystal comprehensive parameter tester, as shown in Figure 7.
The main electro-optical properties of the polymer dispersed liquid-crystal film prepared by embodiment 12 are as shown in table 17.
The main electro-optical properties of the polymer dispersed liquid-crystal film of 17 embodiment 12 of table preparation
Embodiment 13
NDGA/E44/PGDE/E6M/Capcure 3800/E8/DMP-30 is mixed according to the mass fraction ratio of table 18,
After stirring, be circulated into two panels be coated with the electro-conductive glass of tin indium oxide made of in liquid crystal cell, liquid crystal
Box thickness control is 20.0um.Later, sample is firstly placed in thermal station solidify 1.0h at 333.15K.Later, apply to sample
100V extra electric field, sample continue to solidify 48h.After two-stage cure, available polymer dispersed liquid crystals and polymer stabilizing
The PDLC film of system coexists in liquid crystal.
The composition of sample in 18 embodiment 13 of table
The electro-optical properties curve of the PDLC film of above-mentioned preparation is measured with liquid crystal comprehensive parameter tester, as shown in Figure 8.
The main electro-optical properties of the polymer dispersed liquid-crystal film prepared by embodiment 12 are as shown in table 19.
The main electro-optical properties of the polymer dispersed liquid-crystal film of 19 embodiment 13 of table preparation
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, those skilled in the art should understand that, to technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (10)
1. a kind of method for preparing polymer dispersed liquid-crystal film based on epoxy substep heat cure, comprising the following steps:
1) non-liquid crystal property epoxy monomer, liquid crystal liquid crystal property epoxy monomer, polythiol monomer, liquid crystal and promotor are mixed in proportion,
Mixture is circulated into liquid crystal cell, sample is obtained；
2) sample for obtaining step 1) carries out preliminary heat cure；
3) sample for obtaining step 2) carries out secondary heat cure: applying electric field to sample, continues to solidify, obtain polymer stabilizing
The film of system coexists in liquid crystal and polymer dispersed liquid crystals；
Wherein, the non-liquid crystal property epoxy monomer accounts for the 13.6%~21.7% of system gross mass, the liquid crystal liquid crystal property epoxy monomer
Content accounts for the 0%~6% of system gross mass, and the polythiol monomer content accounts for the 24.4%~38.3% of system gross mass, described
Liquid crystal content accounts for the 38.0%-59.0% of system gross mass, and the accelerator content accounts for the 1.0%-2.0% of system gross mass.
2. preparation method according to claim 1, which is characterized in that the non-liquid crystal property epoxy monomer includes ternary epoxy
Compound 4- (2,3- glycidoxy)-N, N- bis- (2,3- glycidyl) aniline, two ring of binary epoxide polypropylene glycol
One or more of oxidative ethane methyl ether and bisphenol A epoxide resin E44.
3. preparation method according to claim 1, which is characterized in that the liquid crystal liquid crystal property epoxy monomer is E6M.
4. preparation method according to claim 1, which is characterized in that the polythiol monomer is polymercaptan Capcure3800.
5. preparation method according to claim 1, which is characterized in that the liquid crystal is nematic liquid crystal E8.
6. preparation method according to claim 1, which is characterized in that the promotor is 2,4,6- tri- (dimethylamino first
Base) phenol.
7. preparation method according to claim 1, which is characterized in that the thickness control of the liquid crystal cell is 19.0 ± 1.0 μ
m。
8. preparation method according to claim 1, which is characterized in that the step 1) liquid crystal cell is coated with indium oxide with two panels
Made of the electro-conductive glass of tin.
9. preparation method according to claim 1, which is characterized in that sample solidification temperature described in step 2) is
313.15K~353.15K, sample curing time are 1.0~24.0h.
10. preparation method according to claim 1, which is characterized in that it is strong that sample described in step 3) solidifies extra electric field
Degree is 0V~100V, and sample solidification temperature is 313.15K~353.15K, and sample curing time is 2-7d.
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