CN113185944B

CN113185944B - UV adhesive and electric control PDLC functional film containing UV adhesive

Info

Publication number: CN113185944B
Application number: CN202110444686.3A
Authority: CN
Inventors: 王继宝; 周翠苹
Original assignee: Shenzhen Sapience Technology Co ltd
Current assignee: Shenzhen Sapience Technology Co ltd
Priority date: 2021-04-24
Filing date: 2021-04-24
Publication date: 2022-08-05
Anticipated expiration: 2041-04-24
Also published as: CN113185944A

Abstract

The application relates to the field of an electronic control PDLC functional film, in particular to a UV adhesive and an electronic control PDLC functional film containing the UV adhesive. The preparation raw materials of the UV adhesive comprise the following substances in parts by weight: 10-30 parts of acrylate monomers with the refractive index of 1.57-1.62, 10-30 parts of hydroxyl acrylate monomers, 5-15 parts of methacrylate monomers, 5-15 parts of urethane acrylate, 1-5 parts of flexible acrylic resin and 1-3 parts of photoinitiator; the urethane acrylate is selected from any two of CN964, MIRAMER M130 and CN 975. The application provides a UV adhesive, bonding property is good, makes the difficult bale breaking of automatically controlled PDLC functional film after using for a long time, can improve the on-state luminousness of automatically controlled PDLC functional film simultaneously.

Description

UV adhesive and electric control PDLC functional film containing UV adhesive

Technical Field

The application relates to the field of an electric control PDLC functional film, in particular to a UV adhesive and an electric control PDLC functional film containing the UV adhesive.

Background

Polymer Dispersed Liquid Crystal (PDLC) has recently been widely used and noticed as a Liquid Crystal shutter. The electric control PDLC functional film comprises an upper conductive film, a lower conductive film and a dimming layer positioned between the two conductive films. The transparency of the PDLC functional film is adjusted by voltage, and the transition between a transparent state and a non-transparent state is realized. The working principle is as follows: when no external voltage is applied, a regular electric field cannot be formed between the films, the optical axis orientation of the liquid crystal particles is random and is in a disordered state, incident light is strongly scattered, and the film is opaque or semitransparent. After the external voltage is applied, the optical axes of the liquid crystal particles are arranged perpendicular to the surface of the film, the incident light is not scattered, and the film is transparent. Therefore, the PDLC has optical switching characteristics under the driving of an applied electric field.

For PDLCs and products manufactured in the market at present, a higher transmittance in the on state generally needs a higher output voltage to be realized. The patent publication No. CN108957826A adopts a PDLC light modulating material containing a UV-cured adhesive, which reduces the driving voltage, and improves the on-state transmittance and reduces the on-state haze. However, the effect of mixing the UV-curable adhesive with the liquid crystal, which is one of the main factors affecting the bonding property and on-state transmittance of the PDLC film, is not studied.

The adhesive and the liquid crystal need to be transparent solution after being mixed, the refractive index after being mixed needs to be close to that of the liquid crystal, the initial voltage and the saturation voltage of the corresponding PDLC film are both low, and the viscosity of the adhesive is required to be close to that of the liquid crystal. In order to make the electrically-controlled PDLC functional film not easy to open after long-term use, the adhesion effect between the light modulation layer and the upper and lower conductive films needs to be improved, which needs to improve the viscosity of the adhesive, but the excessive viscosity of the adhesive can reduce the mixing effect of the adhesive and the liquid crystal, thereby reducing the light transmittance in the open state. Therefore, there is a need to develop a UV adhesive and an electrically controlled PDLC functional film containing the same, which can improve the adhesion between the dimming layer and the upper and lower conductive films without reducing the transmittance in an on state.

Disclosure of Invention

In order to improve the defects that the electric control PDLC functional film is easy to be glued after being used for a long time and has lower light transmittance in an open state, the application provides the UV adhesive and the electric control PDLC functional film containing the UV adhesive.

In a first aspect, the present application provides a UV adhesive, which is implemented by the following technical scheme:

the UV adhesive is prepared from the following raw materials in parts by weight: 10-30 parts of acrylate monomers with the refractive index of 1.57-1.62, 10-30 parts of hydroxyl acrylate monomers, 5-15 parts of methacrylate monomers, 5-15 parts of urethane acrylate, 1-5 parts of flexible acrylic resin and 1-3 parts of photoinitiator; the urethane acrylate is selected from any two of CN964, MIRAMER M130 and CN 975.

By adopting the technical scheme, the acrylate monomer, the hydroxy acrylate monomer and the methacrylate monomer with the refractive index of 1.57-1.62 and the urethane acrylate and the flexible acrylic resin jointly act to form a three-dimensional network structure, so that the bonding property of the UV adhesive can be improved, and the electric control PDLC functional film is not easy to crack after being used for a long time. Meanwhile, the polyurethane acrylate is a compound of any two of CN964, MIRAMER M130 and CN975, so that the viscosity of the UV adhesive is close to the viscosity and the refractive index of the liquid crystal polymer, the mixing effect of the UV adhesive and the liquid crystal polymer is improved, the liquid crystal polymer can be slowly separated out from the UV adhesive during ultraviolet curing to form liquid crystal microdrops, the liquid crystal microdrops are distributed in a three-dimensional network structure after the UV adhesive is cured, and the on-state light transmittance of the electrically-controlled PDLC functional film is improved.

Preferably, the preparation raw materials of the UV adhesive comprise the following substances in parts by weight: 20 parts of acrylate monomers with the refractive index of 1.57-1.62, 20 parts of hydroxyl acrylate monomers, 10 parts of methacrylate monomers, 10 parts of urethane acrylate, 3 parts of flexible acrylic resin and 2 parts of photoinitiator.

By adopting the technical scheme, the refractive index of the UV adhesive can be improved by adjusting the content of the acrylate monomer and the urethane acrylate with the refractive index of 1.57-1.62, so that the refractive index of the UV adhesive is basically consistent with that of the liquid crystal polymer, and the on-state light transmittance is improved; the content of the flexible acrylic resin, the content of the hydroxyl acrylate monomer and the content of the methacrylate monomer are adjusted, so that the bonding property of the UV adhesive can be improved, the electric control PDLC functional film is not easy to open after being used for a long time, and the viscosity of the adhesive is not easy to be too high so as to reduce the open-state light transmittance of the electric control PDLC functional film.

Preferably, the polyurethane acrylate is prepared by mixing MIRAMER M130 and CN975 according to a mass ratio of 1 (2-3).

By adopting the technical scheme, the functionality of the polyurethane acrylate MIRAMER M130 is 1, the functionality of the polyurethane acrylate CN975 is 6, the polyurethane acrylate MIRAMER M130 and the polyurethane acrylate CN975 are compounded, the mass ratio of the polyurethane acrylate MIRAMER M130 to the polyurethane acrylate CN975 is controlled to be 1 (2-3), the stability of hydrogen bonds in urethane is strong, the refractive index of the UV adhesive can be improved, the on-state light transmittance of the electrically-controlled PDLC functional film is improved, the bonding performance of the UV adhesive can be further improved, and the hardness of the UV adhesive is reduced. The stability of hydrogen bonds in the carbamate is strong, so that intermolecular force between the polyurethane acrylate MIRAMER M130 and the polyurethane acrylate CN975 is greatly enhanced, the UV adhesive has strong toughness, the mixing effect of the UV adhesive and a liquid crystal polymer is improved, the phenomenon that the viscosity of the UV adhesive is too high is effectively avoided, the bonding performance of the UV adhesive is improved, and the hardness of the UV adhesive is reduced.

Preferably, the acrylate monomer with the refractive index of 1.57-1.62 is formed by mixing o-phenylphenoxyethyl acrylate and 9, 9-bis [4- (2-acryloyloxyethoxy) phenyl ] fluorene according to the mass ratio of (2-4) to 1.

By adopting the technical scheme, the refractive index of the o-phenylphenoxyethyl acrylate is 1.575, the viscosity is low, the refractive index of 9, 9-bis [4- (2-acryloyloxyethoxy) phenyl ] fluorene is 1.622, the viscosity is high, the o-phenylphenoxyethyl acrylate and the 9, 9-bis [4- (2-acryloyloxyethoxy) phenyl ] fluorene are compounded, the mass ratio of the o-phenylphenoxyethyl acrylate to the 9, 9-bis [4- (2-acryloyloxyethoxy) phenyl ] fluorene is controlled to be (2-4):1, the refractive index and the bonding performance of the UV adhesive can be improved, and the viscosity of the UV adhesive cannot be too high.

Preferably, the hydroxy acrylate monomer is polyethylene glycol monomethacrylate and/or 2-hydroxy-3-phenoxypropyl acrylate; more preferably, the hydroxy acrylate monomer is a mixture of polyethylene glycol monomethacrylate and 2-hydroxy-3-phenoxypropyl acrylate.

By adopting the technical scheme, the initial voltage and the saturation voltage of the electric control PDLC functional film can be reduced when the polyethylene glycol monomethacrylate and/or the 2-hydroxy-3-phenoxypropyl acrylate are crosslinked. The polyethylene glycol monomethacrylate has a strong hydrogen bond effect, so that the intermolecular force between the polyethylene glycol monomethacrylate and the polyurethane acrylate can be enhanced, and the bonding property of the UV adhesive can be improved; the 2-hydroxy-3-phenoxypropyl acrylate contains benzene rings, so that the compatibility of the 2-hydroxy-3-phenoxypropyl acrylate with o-phenylphenoxyethyl acrylate and 9, 9-bis [4- (2-acryloyloxyethoxy) phenyl ] fluorene can be improved; the polyethylene glycol monomethacrylate and the 2-hydroxy-3-phenoxypropyl acrylate are compounded, so that the acting force between the preparation raw materials in the UV adhesive is further improved, the overlarge viscosity of the UV adhesive is avoided to a certain extent, and the on-state light transmittance of the electrically-controlled PDLC functional film is improved.

Preferably, the hydroxyl acrylate monomer is prepared by mixing polyethylene glycol monomethacrylate and 2-hydroxy-3-phenoxypropyl acrylate according to the mass ratio of 1 (0.6-0.8).

By adopting the technical scheme, the compound of the polyethylene glycol monomethacrylate and the 2-hydroxy-3-phenoxypropyl acrylate is adopted as the hydroxyl acrylate monomer, and the mass ratio of the polyethylene glycol monomethacrylate to the 2-hydroxy-3-phenoxypropyl acrylate is controlled to be 1 (0.6-0.8), so that the bonding property of the UV adhesive can be further improved, and the mixing effect of the UV adhesive and the liquid crystal polymer and the on-state light transmittance of the electrically-controlled PDLC functional film are further improved.

Preferably, the methacrylate monomer is 2-propylheptyl methacrylate.

By adopting the technical scheme, the 2-propylheptyl methacrylate contains a long carbon chain with a branched chain, has larger steric hindrance, can reduce the crosslinking density of the UV adhesive to a certain extent, is not easy to cause the viscosity of the UV adhesive to be overhigh, improves the open-state light transmittance, can increase the size of meshes of the cured UV adhesive, reduces the anchoring effect of the UV adhesive on a liquid crystal polymer, and further reduces the driving voltage of the electric control PDLC functional film.

In a second aspect, the application provides an electronic control PDLC functional film containing a UV adhesive, which adopts the following technical scheme: an electric control PDLC functional film containing UV adhesive comprises an upper conductive film, a dimming layer and a lower conductive film; the preparation raw materials of the light modulation layer comprise: the UV liquid crystal display panel comprises a UV adhesive, a liquid crystal polymer and spacer particles, wherein the mass ratio of the UV adhesive to the liquid crystal polymer to the spacer particles is (15-25): (20-40): 0.1-0.2).

By adopting the technical scheme, the electric control PDLC functional film containing the UV adhesive is not easy to open, and the content of the UV adhesive, the liquid crystal polymer and the spacer particles is controlled, so that the on-state light transmittance of the electric control PDLC functional film is higher, and the switching times are more.

Preferably, the spacer has a particle size of 2 to 5 μm.

By adopting the technical scheme, the spacer particles with the particle size of 2-5 mu m have good stability, can maintain the optical characteristics of the liquid crystal polymer, simultaneously enables the thickness of the light modulation layer to be thinner, and can improve the bonding performance and the conduction uniformity of the upper conductive film and the lower conductive film.

Preferably, the upper conductive film and the lower conductive film are both graphene transparent conductive films.

Through adopting above-mentioned technical scheme, this application adopts the transparent conductive film of graphite alkene as upper conductive film and lower floor's conductive film, and the big conjugation system and the two-dimensional structure of graphite alkene can improve stability, pliability, the electric conductivity of automatically controlled PDLC functional film, are difficult for the debonding after repetitious usage.

In summary, the present application has the following beneficial effects:

1. according to the application, the acrylate monomer, the hydroxy acrylate monomer and the methacrylate monomer with the refractive index of 1.57-1.62 are added to jointly act with the polyurethane acrylate and the flexible acrylic resin to form a three-dimensional network structure, so that the bonding property of the UV adhesive can be improved, and the electric control PDLC functional film is not easy to glue after being used for a long time. The urethane acrylate is selected from any two of CN964, MIRAMER M130 and CN975, and the on-state light transmittance of the electric control PDLC functional film is improved.

2. According to the UV adhesive, o-phenylphenoxyethyl acrylate and 9, 9-bis [4- (2-acryloyloxyethoxy) phenyl ] fluorene are compounded, the mass ratio of the o-phenylphenoxyethyl acrylate to the 9, 9-bis [4- (2-acryloyloxyethoxy) phenyl ] fluorene is controlled to be (2-4):1, the refractive index and the bonding property of the UV adhesive can be improved, and the viscosity of the UV adhesive cannot be too high.

3. According to the application, polyethylene glycol monomethacrylate and 2-hydroxy-3-phenoxypropyl acrylate are compounded to serve as hydroxyl acrylate monomers, the mass ratio of the polyethylene glycol monomethacrylate to the 2-hydroxy-3-phenoxypropyl acrylate is controlled to be 1 (0.6-0.8), the bonding performance of the UV adhesive can be further improved, and the mixing effect of the UV adhesive and a liquid crystal polymer and the on-state light transmittance of an electric control PDLC functional film are further improved.

4. This application adopts 2-propyl heptyl methacrylate, and the viscosity that is difficult for making the UV adhesive is too high, reduces the driving voltage of automatically controlled PDLC functional film.

5. The electronic control PDLC functional film containing the UV adhesive is not easy to open after being used for multiple times, the open-state light transmittance is high, and the switching times are multiple.

Detailed Description

The present application will be described in further detail with reference to examples.

The raw materials used in the present application are commercially available, and the raw materials not mentioned in the preparation raw materials in the examples, comparative examples and application examples of the present application are purchased from national pharmaceutical group chemical agents limited, unless otherwise specified.

Examples

Examples 1-21 provide a UV adhesive, and example 1 is described below.

The preparation of the UV adhesive provided in example 1 comprises the following steps:

mixing 10g of o-phenylphenoxyethyl acrylate, 10g of polyethylene glycol monomethacrylate, 5g of ethyl methacrylate (CAS number 97-63-2), 5g of urethane acrylate, 1g of flexible acrylic resin and 1g of photoinitiator, and uniformly stirring at 35 ℃ to obtain a UV adhesive;

wherein the refractive index of the o-phenylphenoxyethyl acrylate is 1.575, and the CAS number is 72009-86-0;

the polyethylene glycol monomethacrylate, CAS number 25736-86-1, purchased from Mitsubishi gas, Japan;

the polyurethane acrylate is formed by mixing CN964 and MIRAMER M130 according to the mass ratio of 1: 1; the CN964 has a functionality of 2, purchased from sartomer source, usa; the MIRAMER M130 has a functionality of 1 and is purchased from sartomer source, usa;

the flexible acrylic resin is under the brand name CN710, purchased from sartomer, usa;

the photoinitiator is 1-hydroxycyclohexyl phenyl ketone (CAS number 947-19-3).

Examples 2-6, which differ from example 1 only in that: the quality of the raw materials for preparing the UV adhesive is different, and the quality is shown in table 1.

Table 1 examples 1-6 quality of raw materials for preparation of UV adhesives

Preparation of originalMaterial

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

O-phenyl phenoxyethyl acrylate

10g

30g

20g

10g

20g

Polyethylene glycol monomethacrylate

10g

30g

20g

10g

20g

Methacrylic acid ethyl ester

5g

15g

10g

5g

10g

Urethane acrylate

5g

15g

10g

5g

Flexible acrylic resin

1g

5g

3g

1g

3g

Photoinitiator

1g

3g

2g

Example 7 differs from example 3 only in that: the polyurethane acrylate is formed by mixing CN964 and CN975 according to the mass ratio of 1: 1; the CN975 has a functionality of 6, purchased from sartomer, usa.

Example 8, which differs from example 3 only in that: the polyurethane acrylate is prepared by mixing MIRAMER M130 and CN975 according to the mass ratio of 1: 1.

Example 9, which differs from example 8 only in that: the mass ratio of the MIRAMER M130 to the CN975 is 1:2.

Example 10, which differs from example 8 only in that: the mass ratio of the MIRAMER M130 to the CN975 is 1: 3.

Example 11, which differs from example 8 only in that: the mass ratio of the MIRAMER M130 to the CN975 is 1: 2.5.

Example 12 differs from example 11 only in that: the acrylate monomer with the refractive index of 1.57-1.62 is formed by mixing o-phenylphenoxyethyl acrylate and 9, 9-bis [4- (2-acryloyloxyethoxy) phenyl ] fluorene according to the mass ratio of 2: 1; the refractive index of the 9, 9-bis [4- (2-acryloyloxyethoxy) phenyl ] fluorene is 1.622, and the CAS number is 161182-73-6.

Example 13 differs from example 12 only in that: the mass ratio of o-phenyl phenoxyethyl acrylate to 9, 9-bis [4- (2-acryloyloxyethoxy) phenyl ] fluorene is 4: 1.

Example 14 differs from example 12 only in that: the mass ratio of o-phenyl phenoxyethyl acrylate to 9, 9-bis [4- (2-acryloyloxyethoxy) phenyl ] fluorene is 3: 1.

Example 15 differs from example 11 only in that: the o-phenyl phenoxyethyl acrylate is replaced by 9, 9-bis [4- (2-acryloyloxyethoxy) phenyl ] fluorene in equal mass.

Example 16, which differs from example 14 only in that: the polyethylene glycol monomethacrylate and the like are replaced by 2-hydroxy-3-phenoxypropyl acrylate (CAS number 16969-10-1).

Example 16, which differs from example 14 only in that: the hydroxyl acrylate monomer is formed by mixing polyethylene glycol monomethacrylate and 2-hydroxy-3-phenoxypropyl acrylate according to the mass ratio of 1: 0.6.

Example 17 differs from example 16 only in that: the mass ratio of the polyethylene glycol monomethacrylate to the 2-hydroxy-3-phenoxypropyl acrylate is 1: 0.8.

Example 18, which differs from example 16 only in that: the mass ratio of the polyethylene glycol monomethacrylate to the 2-hydroxy-3-phenoxypropyl acrylate is 1: 0.7.

Example 19 differs from example 18 only in that: the ethyl methacrylate equivalent mass was replaced with 2-propylheptyl methacrylate (CAS number 149021-58-9).

Example 20, which differs from example 18 only in that: the equal mass of ethyl methacrylate was replaced with lauryl methacrylate (CAS number 142-90-5).

Example 21 differs from example 19 only in that: the photoinitiator was the photoinitiator IRGACURE 907, purchased from basf.

Comparative example

Comparative example 1, which differs from example 1 only in that: the urethane acrylate is MIRAMER M130.

Comparative example 2, which differs from example 1 only in that: the polyurethane acrylate is CN 975.

Comparative example 3, which differs from example 1 only in that: the flexible acrylic resin is replaced by tetrahydrofuran methacrylate in equal mass.

Comparative example 4, which differs from example 1 only in that: the flexible acrylic resin is replaced by polyester acrylate oligomer with the same mass, and the grade of the polyester acrylate oligomer is CN8200 NS and is purchased from Saduoma in America.

Application example

Application examples 1-28 provide an electronically controlled PDLC functional film containing a UV adhesive, and application example 1 is described below as an example.

The electric control PDLC functional film containing the UV adhesive provided by the application example 1 comprises an upper conductive film, a dimming layer and a lower conductive film, and the preparation steps are as follows:

(1) mixing 15g of UV adhesive, 20g of liquid crystal polymer and 0.1g of spacer particles, and uniformly stirring at 40 ℃ to obtain a dimming layer material;

(2) taking two parts of the graphene transparent conductive films as an upper conductive film and a lower conductive film respectively, adjusting the distance between the upper conductive film and the lower conductive film to be 2 micrometers, and clamping;

(3) injecting the light-adjusting layer material obtained in the step (1) between the upper conductive film and the lower conductive film, and performing roll-pressing glue clamping, wherein the ultraviolet light intensity is 250mJ/cm ² Curing for 1.5min, and then curing under the ultraviolet light intensity of 650mJ/cm ² Curing for 4min to obtain an electric control PDLC functional film containing the UV adhesive;

wherein the UV adhesive is derived from example 1;

the liquid crystal polymer is LCP A150, purchased from Japan;

the particle size of the spacer particles is 2 μm, and the spacer particles are purchased from Ezee-Country electronic technology Co., Ltd;

the graphene transparent conductive film is GTCF01, and is purchased from Deyang alkene carbon technology Co.

Application examples 2 to 21 differ from application example 1 only in that: the sources of the UV adhesives are different, and the sources are shown in Table 2.

Table 2 application examples 1-21UV adhesive sources

Application example 22 is different from application example 19 only in that: the liquid crystal polymer was LCP 6140, purchased from dupont, usa.

Application examples 23 to 24 differ from application example 19 only in that: the quality of the raw materials for preparing the dimming layer material is different, and the quality is shown in table 3.

TABLE 3 quality of preparation raw materials for application examples 19, 23-24 dimming layer materials

Raw material for preparing light-adjusting layer material	Application example 19	Application example 23	Application example 24
				Adhesive agent	15g	25g	20g
Liquid crystalline polymers	20g	40g	30g
				Spacer particles	0.1g	0.2g	0.15g

Application 25 differs from application 24 only in that: the distance between the upper conductive film and the lower conductive film is 5 mu m; the spacer particles have a particle size of 5 μm.

Application 26 differs from application 24 only in that: the distance between the upper conductive film and the lower conductive film is 3.5 mu m; the spacer particle had a particle size of 3.5 μm.

Application 27 differs from application 24 only in that: the distance between the upper conductive film and the lower conductive film is 10 micrometers; the spacer particle has a particle size of 10 μm.

Application 28 differs from application 26 only in that: the graphene transparent conductive film is replaced by an ITO conductive film and purchased from a Japanese tail pool.

Comparative application

Comparative examples 1 to 4 were applied, differing from application example 1 only in that: the UV adhesives are from different sources, and are shown in Table 4.

Table 4 comparative examples 1-4UV adhesive sources for use

Electric control PDLC functional film	Application comparative example 1	Comparative application example 2	Comparative application example 3	Application comparative example 4
					UV adhesive source	Comparative example 1	Comparative example 2	Comparative example 3	Comparative example 4

Performance test

The following performance tests were performed for the electrically controlled PDLC functional films provided in application examples 1 to 28 of the present application and comparative application examples 1 to 4.

1. Adhesive property: the electrically controlled PDLC functional films provided in application examples 1 to 28 and comparative application examples 1 to 4 were used for a long time, and the time for which the glue was started to appear was recorded by observing whether the electrically controlled PDLC functional film had the appearance of the glue, and the test results are shown in table 5.

2. Light transmittance: the electrically controlled PDLC functional films provided in application examples 1 to 28 and comparative application examples 1 to 4 were connected to ac power at different voltages (0V, 10V, 20V, 30V, 40V, 50V), and the light transmittances of the electrically controlled PDLC functional films provided in application examples 1 to 28 and comparative application examples 1 to 4 were measured using a TU-1810 uv-vis spectrophotometer (purchased from beijing pros instruments ltd), the measurement wavelength was set to 550nm, and the measurement results of the light transmittances at different voltages using air as a reference are shown in table 5.

Table 5 performance test data

The present application is described in detail below with reference to the test data provided in table 6.

Comparing the performance test data of application example 1 and application examples 1-2, it can be seen that the urethane acrylate in application example 1 is CN964 and MIRAMER M130, so that the adhesive property and the on-state light transmittance are improved, and the saturation voltage value is reduced; in comparison application example 1, the polyurethane acrylate is CN964, the functionality is 1, the crosslinking density is low, and the bonding property is poor; in comparative application example 2, the urethane acrylate is CN975, and has a functionality of 6, a high crosslinking density, a low flexibility, a good adhesive property, but a low on-state transmittance and a high saturation voltage.

Comparing the performance test data of application examples 1-6, it can be known that adjusting the content of o-phenylphenoxyethyl acrylate, urethane acrylate CN964 and MIRAMER M130 can increase the refractive index of the UV adhesive, so that the refractive index of the UV adhesive is basically consistent with that of the liquid crystal polymer, and the on-state light transmittance is increased; the content of the flexible acrylic resin KDR2031, the polyethylene glycol monomethacrylate and the ethyl methacrylate is adjusted, so that the bonding property of the UV adhesive can be improved, and the electric control PDLC functional film is not easy to be separated after being used for a long time. Comprehensively, the application example 3 has longer glue opening time and higher on-state light transmittance.

Comparing the performance test data of application examples 3 and 7-11, it can be seen that the urethane acrylate in application example 8 is formed by mixing MIRAMER M130 and CN975, the electrically controlled PDLC functional film prepared in application example 8 has longer glue opening time and higher on-state light transmittance; in application example 7, the urethane acrylate was prepared by mixing CN964 and CN975, and the gel opening time was longer, but the on-state transmittance was lower. The mass ratio of MIRAMER M130 to CN975 is 1:2.5, the glue opening time of the corresponding electric control PDLC functional film is longer, and the on-state light transmittance is higher.

Comparing the performance test data of application examples 11 to 15, it can be seen that the compounding of o-phenylphenoxyethyl acrylate and 9, 9-bis [4- (2-acryloyloxyethoxy) phenyl ] fluorene can greatly improve the on-state light transmittance, and meanwhile, when the mass ratio of o-phenylphenoxyethyl acrylate to 9, 9-bis [4- (2-acryloyloxyethoxy) phenyl ] fluorene is 3:1, the electrically controlled PDLC functional film has longer glue-opening time and higher on-state light transmittance.

Comparing the performance test data of application examples 14 and 16-18, the compounding of the polyethylene glycol monomethacrylate and the 2-hydroxy-3-phenoxypropyl acrylate can improve the open-state light transmittance of the electrically-controlled PDLC functional film and prolong the glue-opening time; the mass ratio of the polyethylene glycol monomethacrylate to the 2-hydroxy-3-phenoxypropyl acrylate is 1:0.7, the corresponding electrically-controlled PDLC functional film has longer glue opening time and higher on-state light transmittance.

Comparing the performance test data of application examples 18 and 19-20, it can be seen that 2-propylheptyl methacrylate contains a long carbon chain with a branched chain, has a large steric hindrance, can reduce the crosslinking density of the UV adhesive to a certain extent, and is not easy to cause the viscosity of the UV adhesive to be too high, thereby improving the on-state light transmittance.

Comparing the performance test data of application examples 19 and 23-24, it can be seen that the electric control PDLC functional films prepared from the UV adhesive, the liquid crystal polymer and the spacer particles with different masses have different adhesive properties and on-state light transmittances, wherein the electric control PDLC functional film corresponding to application example 24 has a higher on-state light transmittance and a longer off-state time.

Comparing the performance test data of application examples 24 to 27, it can be known that the particle size of the spacer is equal to the distance between the upper conductive film and the lower conductive film, and the conductive uniformity can be improved, wherein the electrically controlled PDLC functional film corresponding to the spacer with the particle size of 3.5 μm has a longer glue-opening time and a higher on-state light transmittance.

Comparing the performance test data of application examples 26 and 28, it can be seen that the graphene transparent conductive film is used as an upper conductive film and a lower conductive film, and the large conjugated system and the two-dimensional structure of the graphene can improve the stability, flexibility and conductivity of the electrically-controlled PDLC functional film, and the film is not easy to be separated after being used for a long time.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. The UV adhesive is characterized in that the preparation raw materials comprise the following substances in parts by weight: 10-30 parts of acrylate monomers with the refractive index of 1.57-1.62, 10-30 parts of hydroxyl acrylate monomers, 5-15 parts of methacrylate monomers, 5-15 parts of urethane acrylate, 1-5 parts of flexible acrylic resin and 1-3 parts of photoinitiator;

the polyurethane acrylate is formed by mixing MIRAMER M130 and CN975 according to the mass ratio of 1 to (2-3), or the polyurethane acrylate is formed by mixing MIRAMER M130 and CN964 according to the mass ratio of 1 to 1;

the methacrylate monomer is 2-propyl heptyl methacrylate; the grade of the flexible acrylate monomer is CN 710;

the acrylate monomer with the refractive index of 1.57-1.62 is formed by mixing o-phenylphenoxyethyl acrylate and 9, 9-bis [4- (2-acryloyloxyethoxy) phenyl ] fluorene according to the mass ratio of (2-4) to 1;

the hydroxyl acrylate monomer is formed by mixing polyethylene glycol monomethacrylate and 2-hydroxy-3-phenoxypropyl acrylate according to the mass ratio of 1 (0.6-0.8).

2. The UV adhesive according to claim 1, wherein the preparation raw materials comprise the following substances in parts by weight: 20 parts of acrylate monomers with the refractive index of 1.57-1.62, 20 parts of hydroxyl acrylate monomers, 10 parts of methacrylate monomers, 10 parts of urethane acrylate, 3 parts of flexible acrylic resin and 2 parts of photoinitiator.

3. An electric control PDLC functional film containing UV adhesive is characterized by comprising an upper conductive film, a dimming layer and a lower conductive film; the preparation raw materials of the light modulation layer comprise: the UV liquid crystal display panel comprises a UV adhesive, a liquid crystal polymer and spacer particles, wherein the mass ratio of the UV adhesive to the liquid crystal polymer to the spacer particles is (15-25): (20-40): 0.1-0.2); the UV adhesive is the UV adhesive of any one of claims 1-2.

4. The electrically controlled PDLC functional film containing UV adhesive according to claim 3, wherein said spacer particles have a particle size of 2-5 μm.

5. The electrically controlled PDLC functional film containing the UV adhesive as claimed in claim 3, wherein the upper conductive film and the lower conductive film are both graphene transparent conductive films.