CN112745521A - High-toughness polyimide explosion-proof membrane - Google Patents
High-toughness polyimide explosion-proof membrane Download PDFInfo
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Abstract
The invention belongs to the technical field of explosion-proof membranes, and particularly relates to a high-toughness polyimide explosion-proof membrane which comprises a polyimide layer and a hardened layer, wherein the hardened layer comprises the following components in parts by weight: 80-100 parts of urethane acrylate, 20-30 parts of flexible anti-aging agent, 10-20 parts of reactive diluent, 1-3 parts of photoinitiator, 10-20 parts of nano particles, 0.05-1 part of anti-fingerprint agent and 80-150 parts of solvent. According to the explosion-proof membrane, the hardened layer is coated on the polyimide layer, the polyimide layer is good in foldability but poor in hardness, the high-functionality polyurethane acrylate in the hardened layer can effectively improve the hardness and the wear resistance of the hardened layer, the flexible anti-aging agent can ensure that the hardened layer can be well bent along with the polyimide layer, the ageing resistance of the explosion-proof membrane can be improved, and the explosion-proof membrane has high hardness and foldability and long service life.
Description
Technical Field
The invention belongs to the technical field of explosion-proof membranes, and particularly relates to a high-toughness polyimide explosion-proof membrane.
Background
The polyimide has excellent mechanical property, heat resistance, low temperature resistance, flame retardance, solvent resistance and electrical property, can be used as a structural composite material, an electrical appliance insulating material, an adhesive and a coating material, and is widely applied to the fields of electronics and microelectronics, aerospace, optics, electromechanics and the like. Particularly in the field of microelectronics, polyimide is often used as a dielectric layer for interlayer insulation, as a buffer layer to reduce stress, as a protective layer to reduce environmental damage, and as a shield layer to reduce device errors, and also as a substrate for a flexible printed wiring circuit and various electronic parts such as an alignment film for liquid crystal display. Among them, polyimide films have been widely used for foldable screens due to their excellent foldability, but the hardness of polyimide films is not satisfactory, and therefore, it is generally necessary to coat a hardened layer on the surface of polyimide films to improve the strength.
However, the folding screen frequently undergoes folding-stretching-folding during use, and the hardened layer brings high hardness and needs to maintain good flexibility to meet the requirements of the folding screen. Therefore, how to increase the hardness while maintaining a certain flexibility is a problem to be solved at present.
Chinese patent document CN 111394003 a discloses a curved screen explosion-proof membrane and a method for manufacturing the same, the curved screen explosion-proof membrane includes a polyimide membrane, a bonding layer and a release film, and a coating liquid is coated between the bonding layer and the polyimide membrane, the coating liquid is prepared from polyester resin, organosilicon modified polyester resin and butanone and is used for improving the adhesion between the bonding layer and the polyimide layer, however, the explosion-proof membrane is only used for a curved screen, the curved screen is bent and formed in the preparation process, and the screen is not bent or even folded in the use process of a subsequent user, therefore, the explosion-proof membrane can meet the explosion-proof requirement of the curved screen, but cannot be applied to a folding screen.
Disclosure of Invention
In order to solve the problems, the invention discloses a high-toughness polyimide explosion-proof membrane, which adopts high-functionality polyurethane acrylate to effectively improve the hardness and the wear resistance of a hardened layer, and adds a flexible anti-aging agent, so that the hardened layer can be well bent along with the polyimide layer, the aging resistance of the explosion-proof membrane can be improved, and the explosion-proof membrane has high hardness and foldability and longer service life.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a high tenacity polyimide rupture membrane, includes polyimide layer and sclerosis layer, the sclerosis layer includes each component of following part by weight: 80-100 parts of high-functionality polyurethane acrylate, 20-30 parts of flexible anti-aging agent, 10-20 parts of reactive diluent, 1-3 parts of photoinitiator, 10-20 parts of nano particles, 0.05-1 part of anti-fingerprint agent and 80-150 parts of solvent.
Preferably, the flexible antioxidant is a reaction product of 4-methoxy-N- (4-aminocyclohexyl) aniline and polyethylene glycol dicarboxylic acid, and the structural formula is as follows:
the preparation method of the flexible anti-aging agent comprises the following steps:
(1) adding p-hydroxyanisole and 1, 4-cyclohexanediamine into a reaction kettle according to a molar ratio of 1:1, adding a proper amount of skeletal nickel catalyst, heating to 190 ℃ under stirring, carrying out condensation reaction, evaporating the 1, 4-cyclohexanediamine to carry out reaction generated water, separating water after condensation, returning the 1, 4-cyclohexanediamine to the reaction kettle, carrying out condensation reaction until no water is generated, recycling the catalyst by filter pressing, distilling the distilled water and unreacted raw materials under reduced pressure, recrystallizing, washing with water, filtering, and drying to obtain a product I (4-methoxy-N- (4-aminocyclohexyl) aniline), wherein the reaction equation is as follows:
(2) dissolving polyethylene glycol dicarboxylic acid in DMF, adjusting pH to about 6 with MES buffer solution, adding EDC for activation for 10min, adding NHS (the molar ratio of EDC to NHS is 4:1), adding a proper amount of hydroquinone polymerization inhibitor, mixing uniformly, adjusting pH to about 7.4 with PBS buffer solution to obtain solution I, dissolving the product I in DMF according to the molar ratio of the product I (4-methoxy-N- (4-aminocyclohexyl) aniline) to the polyethylene glycol dicarboxylic acid of 2-3:1 to obtain solution II, slowly dripping the solution II into the solution I to obtain a mixture, stirring the mixture for 6h at 50 ℃ under nitrogen atmosphere, concentrating by rotary evaporation, precipitating in THF/diethyl ether (10/200mL) to remove impurities, centrifuging to obtain supernatant, and finally drying under vacuum at 35 ℃ to constant weight to obtain the flexible anti-aging agent, the reaction equation is as follows:
preferably, the molecular weight of the polyethylene glycol dicarboxylic acid is not less than 200.
Preferably, the polyethylene glycol dicarboxylic acid has a molecular weight of 400-1000.
Preferably, the high-functionality urethane acrylate is a urethane acrylate having a functionality of 6 or more.
Preferably, the reactive diluent is one or more selected from tripropylene glycol diacrylate, trimethylolpropane triacrylate, isobornyl methacrylate, pentaerythritol triacrylate, isodecyl acrylate and polyethoxyethyl acrylate.
Preferably, the photoinitiator is one or more of phenyl bis (2,4, 6-trimethylbenzoyl) phosphine oxide, 2,4, 6-trimethylbenzoyl diphenylphosphine oxide, 4-phenylbenzophenone, 2-hydroxy-2-methyl-1-phenyl acetone, 1-hydroxycyclohexyl phenyl ketone and isopropyl thioxanthone.
Preferably, the anti-fingerprint agent is a perfluorovinyl ether-based reactive surfactant.
Preferably, the nanoparticles are one or two of nano-silica modified by a silane coupling agent KH-570 and nano-titanium dioxide modified by the silane coupling agent KH-570.
Preferably, the solvent is one or more of methyl ethyl ketone, propylene glycol monomethyl ether, isopropanol, n-butyl acetate, butanone and methyl isobutyl ketone.
The invention has the following beneficial effects:
(1) according to the explosion-proof membrane, the hardened layer is coated on the polyimide layer, the polyimide layer is good in foldability but poor in hardness, the high-functionality polyurethane acrylate in the hardened layer can effectively improve the hardness and the wear resistance of the hardened layer, the flexible anti-aging agent can ensure that the hardened layer can be well bent along with the polyimide layer, the ageing resistance of the explosion-proof membrane can be improved, and the explosion-proof membrane has high hardness and foldability and also has a long service life;
(2) according to the invention, the two ends of the flexible anti-aging agent in the hardened layer are of N-cyclohexyl p-anisidine structures with good radiation aging resistance and general aging resistance, the middle part is of a long ether chain structure, and the rigid annular structures with two symmetrical ends are beneficial to prolonging the service life of the explosion-proof membrane and can also serve as fulcrums, so that the flexibility of the explosion-proof membrane can be better improved by the middle long ether chain;
(3) benzene rings and cyclohexyl structures at two ends of the flexible anti-aging agent have larger space bit groups, so that proper distances can be kept between different flexible anti-aging agent molecules and between two ends of the same flexible anti-aging agent molecule, the flexible anti-aging agent is favorably dispersed in the whole system more uniformly, and a single flexible anti-aging agent molecule can be stretched better;
(4) the nano particles are nano silicon dioxide or nano titanium dioxide modified by a silane coupling agent KH-570, and the silane coupling agent KH-570 contains double bonds, so that the nano particles can be bonded with urethane acrylate to better fix the nano particles in a system to play a role.
Detailed Description
The present invention will now be described in further detail with reference to examples.
The preparation method of the explosion-proof membrane comprises the following steps:
(1) weighing high-functionality polyurethane acrylate, a flexible anti-aging agent, a reactive diluent, a photoinitiator, nanoparticles, an anti-fingerprint agent and a solvent according to a proportion, dispersing the nanoparticles in the solvent, grinding uniformly, adding the rest components, and dispersing uniformly to obtain a hardening liquid;
(2) uniformly coating the hardening liquid prepared in the step (1) on a polyimide film, and then carrying out thermal drying to volatilize a solvent;
(3) and carrying out UV curing, attaching a protective film, and cutting according to requirements.
Example 1
(1) Weighing 40 parts of Etercure6145-100(6 functional) of Changxing chemistry, 40 parts of Etercure6150-100(6 functional) of Changxing chemistry, 20 parts of flexible anti-aging agent (polyethylene glycol dicarboxylic acid molecular weight is 400), 5 parts of tripropylene glycol diacrylate, 5 parts of trimethylolpropane triacrylate, 1 part of phenyl bis (2,4, 6-trimethylbenzoyl) phosphine oxide, 10 parts of nano silicon dioxide modified by silane coupling agent KH-570, 0.05 part of anti-fingerprint agent, 40 parts of methyl ethyl ketone and 40 parts of isopropanol, adding the nano silicon dioxide modified by silane coupling agent KH-570 into a solvent, uniformly grinding, then adding the rest components, and uniformly dispersing to obtain a hardening solution;
(2) uniformly coating the hardening liquid on a polyimide film, and drying at 80-85 ℃ for 7min to volatilize the solvent;
(3) according to the illumination intensity of 300mW/cm2Light quantity of 600mJ/cm2And carrying out UV curing under the UV curing condition of the film surface temperature of 40 ℃, then attaching a protective film, and cutting according to requirements.
Example 2
(1) Weighing 60 parts of Etercure6150-100(6 functional) of Changxing chemical, 30 parts of Etercure _ DR-U591(10 functional) of Changxing chemical, 25 parts of flexible anti-aging agent (polyethylene glycol dicarboxylic acid molecular weight is 600), 10 parts of tripropylene glycol diacrylate, 5 parts of isobornyl methacrylate, 1 part of phenyl bis (2,4, 6-trimethylbenzoyl) phosphine oxide, 1 part of 2,4, 6-trimethylbenzoyl diphenylphosphine oxide, 10 parts of nano silicon dioxide modified by a silane coupling agent KH-570, 6 parts of nano titanium dioxide modified by the silane coupling agent KH-570, 0.4 part of anti-fingerprint agent, 60 parts of propylene glycol monomethyl ether, 40 parts of n-butyl acetate and 20 parts of butanone, adding the nano silicon dioxide modified by the silane coupling agent KH-570 and the nano titanium dioxide modified by the silane coupling agent KH-570 into a solvent, uniformly grinding, then adding the rest components, and uniformly dispersing to obtain a hardening liquid;
(2) uniformly coating the hardening liquid on a polyimide film, and drying at 95-100 ℃ for 5min to volatilize the solvent;
(3) according to the illumination intensity of 400mW/cm2Light quantity of 500mJ/cm2And carrying out UV curing under the UV curing condition of the film surface temperature of 60 ℃, then attaching a protective film, and cutting according to requirements.
Example 3
(1) Weighing 40 parts of Etercure6145-100(6 functional) of Changxing chemistry, 45 parts of Etercure6150-100(6 functional) of Changxing chemistry, 23 parts of a flexible anti-aging agent (polyethylene glycol dicarboxylic acid molecular weight is 800), 5 parts of tripropylene glycol diacrylate, 5 parts of trimethylolpropane triacrylate, 2 parts of pentaerythritol triacrylate, 0.5 part of 4-phenylbenzophenone, 1 part of 2-hydroxy-2-methyl-1-phenyl acetone, 8 parts of nano silicon dioxide modified by a silane coupling agent KH-570, 5 parts of nano titanium dioxide modified by the silane coupling agent KH-570, 0.1 part of an anti-fingerprint agent, 50 parts of butanone and 50 parts of methyl isobutyl ketone, adding the nano silicon dioxide modified by the silane coupling agent KH-570 and the nano titanium dioxide modified by the silane coupling agent KH-570 into a solvent, uniformly grinding, then adding the rest components, and uniformly dispersing to obtain a hardening liquid;
(2) uniformly coating the hardening liquid on the polyimide film, and drying at 115-120 ℃ for 3min to volatilize the solvent;
(3) according to the illumination intensity of 200mW/cm2Light quantity of 800mJ/cm2And carrying out UV curing under the UV curing condition of the film surface temperature of 50 ℃, then attaching a protective film, and cutting according to requirements.
Example 4
(1) Weighing 70 parts of Etercure6145-100(6 functional) of Changxing chemical, 30 parts of Etercure _ DR-U591(10 functional) of Changxing chemical, 30 parts of flexible anti-aging agent (polyethylene glycol dicarboxylic acid molecular weight is 1000), 10 parts of tripropylene glycol diacrylate, 5 parts of isodecyl acrylate, 5 parts of polyethoxyethyl acrylate, 2 parts of 1-hydroxycyclohexyl phenyl ketone, 1 part of isopropyl thioxanthone, 10 parts of nano silicon dioxide modified by a silane coupling agent KH-570, 10 parts of nano titanium dioxide modified by the silane coupling agent KH-570, 1 part of anti-fingerprint agent, 50 parts of propylene glycol monomethyl ether, 50 parts of isopropanol and 50 parts of n-butyl acetate, adding the nano silicon dioxide modified by the silane coupling agent KH-570 and the nano titanium dioxide modified by the silane coupling agent KH-570 into a solvent, uniformly grinding, then adding the rest components, uniformly dispersing to obtain a hardening liquid;
(2) uniformly coating the hardening liquid on the polyimide film, and drying at 100-105 ℃ for 4min to volatilize the solvent;
(3) according to the illumination intensity of 300mW/cm2Light quantity of 600mJ/cm2And carrying out UV curing under the UV curing condition of the film surface temperature of 50 ℃, then attaching a protective film, and cutting according to requirements.
Example 5
(1) Weighing 50 parts of Etercure6150-100(6 functional) of Changxing chemical, 45 parts of Etercure _ DR-U591(10 functional) of Changxing chemical, 28 parts of flexible anti-aging agent (polyethylene glycol dicarboxylic acid molecular weight is 600), 5 parts of tripropylene glycol diacrylate, 5 parts of trimethylolpropane triacrylate, 5 parts of pentaerythritol triacrylate, 2 parts of isodecyl acrylate, 0.8 part of phenyl bis (2,4, 6-trimethylbenzoyl) phosphine oxide, 2 parts of 2,4, 6-trimethylbenzoyl diphenylphosphine oxide, 10 parts of nano silicon dioxide modified by a silane coupling agent KH-570, 8 parts of nano titanium dioxide modified by the silane coupling agent KH-570, 0.8 part of anti-fingerprint agent, 100 parts of methyl ethyl ketone and 50 parts of n-butyl acetate, adding the nano silicon dioxide modified by the silane coupling agent KH-570 and the nano titanium dioxide modified by the silane coupling agent KH-570 into a solvent, uniformly grinding, then adding the rest components, and uniformly dispersing to obtain a hardening liquid;
(2) uniformly coating the hardening liquid on the polyimide film, and drying at the temperature of 110-115 ℃ for 3min to volatilize the solvent;
(3) according to the illumination intensity of 300mW/cm2Light quantity of 600mJ/cm2And carrying out UV curing under the UV curing condition of the film surface temperature of 50 ℃, then attaching a protective film, and cutting according to requirements.
Example 6
(1) Weighing 60 parts of Etercure6150-100(6 functional group) in Changxing chemistry, 30 parts of Etercure _ DR-U591(10 functional group) in Changxing chemistry, 25 parts of flexible anti-aging agent (polyethylene glycol dicarboxylic acid molecular weight is 600), 10 parts of tripropylene glycol diacrylate, 5 parts of isobornyl methacrylate, 1 part of phenyl bis (2,4, 6-trimethylbenzoyl) phosphine oxide, 1 part of 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide, 10 parts of unmodified nano-silica, 6 parts of unmodified nano-titanium dioxide, 0.4 part of anti-fingerprint agent, 60 parts of propylene glycol monomethyl ether, 40 parts of n-butyl acetate and 20 parts of butanone, adding the unmodified nano-silica and the unmodified nano-titanium dioxide into a solvent, uniformly grinding, adding the rest components, and uniformly dispersing to obtain a hardening liquid;
(2) uniformly coating the hardening liquid on a polyimide film, and drying at 95-100 ℃ for 5min to volatilize the solvent;
(3) according to the illumination intensity of 400mW/cm2Light quantity of 500mJ/cm2And carrying out UV curing under the UV curing condition of the film surface temperature of 60 ℃, then attaching a protective film, and cutting according to requirements.
Example 7
(1) Weighing 60 parts of Etercure6150-100(6 functional) of Changxing chemical, 30 parts of Etercure _ DR-U591(10 functional) of Changxing chemical, 25 parts of flexible anti-aging agent (polyethylene glycol dicarboxylic acid molecular weight is 200), 10 parts of tripropylene glycol diacrylate, 5 parts of isobornyl methacrylate, 1 part of phenyl bis (2,4, 6-trimethylbenzoyl) phosphine oxide, 1 part of 2,4, 6-trimethylbenzoyl diphenylphosphine oxide, 10 parts of nano silicon dioxide modified by a silane coupling agent KH-570, 6 parts of nano titanium dioxide modified by the silane coupling agent KH-570, 0.4 part of anti-fingerprint agent, 60 parts of propylene glycol monomethyl ether, 40 parts of n-butyl acetate and 20 parts of butanone, adding the nano silicon dioxide modified by the silane coupling agent KH-570 and the nano titanium dioxide modified by the silane coupling agent KH-570 into a solvent, uniformly grinding, then adding the rest components, and uniformly dispersing to obtain a hardening liquid;
(2) uniformly coating the hardening liquid on a polyimide film, and drying at 95-100 ℃ for 5min to volatilize the solvent;
(3) according to the illumination intensity of 400mW/cm2Light quantity of 500mJ/cm2And carrying out UV curing under the UV curing condition of the film surface temperature of 60 ℃, then attaching a protective film, and cutting according to requirements.
Example 8
(1) Weighing 60 parts of Etercure6150-100(6 functional) of Changxing chemical, 30 parts of Etercure _ DR-U591(10 functional) of Changxing chemical, 25 parts of flexible anti-aging agent (polyethylene glycol dicarboxylic acid molecular weight is 1200), 10 parts of tripropylene glycol diacrylate, 5 parts of isobornyl methacrylate, 1 part of phenyl bis (2,4, 6-trimethylbenzoyl) phosphine oxide, 1 part of 2,4, 6-trimethylbenzoyl diphenylphosphine oxide, 10 parts of nano silicon dioxide modified by a silane coupling agent KH-570, 6 parts of nano titanium dioxide modified by the silane coupling agent KH-570, 0.4 part of anti-fingerprint agent, 60 parts of propylene glycol monomethyl ether, 40 parts of n-butyl acetate and 20 parts of butanone, adding the nano silicon dioxide modified by the silane coupling agent KH-570 and the nano titanium dioxide modified by the silane coupling agent KH-570 into a solvent, uniformly grinding, then adding the rest components, and uniformly dispersing to obtain a hardening liquid;
(2) uniformly coating the hardening liquid on a polyimide film, and drying at 95-100 ℃ for 5min to volatilize the solvent;
(3) according to the illumination intensity of 400mW/cm2Light quantity of 500mJ/cm2And carrying out UV curing under the UV curing condition of the film surface temperature of 60 ℃, then attaching a protective film, and cutting according to requirements.
Example 9
(1) Weighing 60 parts of Etercure6150-100(6 functional) of Changxing chemical, 30 parts of Etercure _ DR-U268(3 functional) of Changxing chemical, 25 parts of flexible anti-aging agent (polyethylene glycol dicarboxylic acid molecular weight is 600), 10 parts of tripropylene glycol diacrylate, 5 parts of isobornyl methacrylate, 1 part of phenyl bis (2,4, 6-trimethylbenzoyl) phosphine oxide, 1 part of 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide, 10 parts of nano silicon dioxide modified by a silane coupling agent KH-570, 6 parts of nano titanium dioxide modified by the silane coupling agent KH-570, 0.4 part of anti-fingerprint agent, 60 parts of propylene glycol monomethyl ether, 40 parts of n-butyl acetate and 20 parts of butanone, adding the nano silicon dioxide modified by the silane coupling agent KH-570 and the nano titanium dioxide modified by the silane coupling agent KH-570 into a solvent, uniformly grinding, then adding the rest components, and uniformly dispersing to obtain a hardening liquid;
(2) uniformly coating the hardening liquid on a polyimide film, and drying at 95-100 ℃ for 5min to volatilize the solvent;
(3) according to the illumination intensity of 400mW/cm2Light quantity of 500mJ/cm2And carrying out UV curing under the UV curing condition of the film surface temperature of 60 ℃, then attaching a protective film, and cutting according to requirements.
Comparative example 1
(1) Weighing 60 parts of Etercure6150-100(6 functional) of Changxing chemical, 30 parts of Etercure _ DR-U591(10 functional) of Changxing chemical, 23 parts of polyether acrylate, 2 parts of N-cyclohexyl p-methoxyaniline, 10 parts of tripropylene glycol diacrylate, 5 parts of isobornyl methacrylate, 1 part of phenyl bis (2,4, 6-trimethylbenzoyl) phosphine oxide, 1 part of 2,4, 6-trimethylbenzoyl diphenylphosphine oxide, 10 parts of nano-silica modified by a silane coupling agent KH-570, 6 parts of nano-titania modified by a silane coupling agent KH-570, 0.4 part of anti-fingerprint agent, 60 parts of propylene glycol monomethyl ether, 40 parts of N-butyl acetate and 20 parts of butanone, adding the nano-silica modified by the silane coupling agent KH-570 and the nano-titania modified by the silane coupling agent KH-570 into a solvent, uniformly grinding, then adding the rest components, and uniformly dispersing to obtain a hardening liquid;
(2) uniformly coating the hardening liquid on a polyimide film, and drying at 95-100 ℃ for 5min to volatilize the solvent;
(3) according to the illumination intensity of 400mW/cm2Light quantity of 500mJ/cm2And carrying out UV curing under the UV curing condition of the film surface temperature of 60 ℃, then attaching a protective film, and cutting according to requirements.
Comparative example 2
(1) Weighing 60 parts of Etercure6150-100(6 functional) of Changxing chemical, 30 parts of Etercure _ DR-U591(10 functional) of Changxing chemical, 25 parts of polyether acrylate, 10 parts of tripropylene glycol diacrylate, 5 parts of isobornyl methacrylate, 1 part of phenyl bis (2,4, 6-trimethylbenzoyl) phosphine oxide, 1 part of 2,4, 6-trimethylbenzoyl diphenylphosphine oxide, 10 parts of nano silicon dioxide modified by a silane coupling agent KH-570, 6 parts of nano titanium dioxide modified by the silane coupling agent KH-570, 0.4 part of anti-fingerprint agent, 60 parts of propylene glycol monomethyl ether, 40 parts of n-butyl acetate and 20 parts of butanone, adding the nano silicon dioxide modified by the silane coupling agent KH-570 and the nano titanium dioxide modified by the silane coupling agent KH-570 into a solvent, uniformly grinding, then adding the rest components, uniformly dispersing to obtain a hardening liquid;
(2) uniformly coating the hardening liquid on a polyimide film, and drying at 95-100 ℃ for 5min to volatilize the solvent;
(3) according to the illumination intensity of 400mW/cm2Light quantity of 500mJ/cm2And carrying out UV curing under the UV curing condition of the film surface temperature of 60 ℃, then attaching a protective film, and cutting according to requirements.
The explosion-proof membranes prepared in examples 1 to 9 and comparative examples 1 to 2 were subjected to various performance tests, and the test results are shown in table 1.
TABLE 1
The dynamic bending test method comprises the following steps: under the conditions that the bending radius R is 3mm and the frequency is 30 times/minute, a bending tester is adopted to carry out bending test, and the result is recorded; the aging performance test method comprises the following steps: UV-A, 340nm, 0.63W/m2The Delta E value was measured by irradiation at/nm for 4h, followed by standing at 60 ℃ and 95% relative humidity for 4h, 8h for 12 cycles.
As can be seen from Table 1, the rupture membranes prepared in examples 1 to 5 are good in hardness, flexibility, wear resistance, bending resistance and the like; in the embodiment 6, as the nano material adopts unmodified nano silicon dioxide and unmodified nano titanium dioxide, the dispersion effect is not as good as that of the nano particles modified by a silane coupling agent KH-570, and double bonds on the KH-570 can be bonded with a system, so that the dispersion and the long-term action are facilitated, the elongation at break of the embodiment 6 only reaches 7.8 percent, the flexibility is poor, the initial water drop angle is small, and the bending property and the aging property are correspondingly influenced; in example 7, the molecular weight of the polyethylene glycol dicarboxylic acid used for preparing the flexible anti-aging agent is 200, the chain segment is short, the flexibility is relatively poor, and the polyethylene glycol dicarboxylic acid with the small molecular weight can graft more N-cyclohexyl p-anisidine structures, so that the aging performance is good, but the bending performance is reduced; in example 8, the molecular weight of the polyethylene glycol dicarboxylic acid used for preparing the flexible antioxidant is 1200, and if the chain segment is too long, the number of the chain segments is reduced, but the bending performance is affected to a certain extent, and due to the large molecular weight, the polyethylene glycol dicarboxylic acid can graft a small number of N-cyclohexyl p-anisidine structures, so that the aging performance is relatively poor; in example 9, polyurethane acrylate with part of 3 functionalities is adopted, so that the hardness of the explosion-proof membrane is reduced, and the wear resistance is reduced; in the comparative example 1, polyether acrylate and N-cyclohexyl p-methoxyaniline are used for replacing a flexible anti-aging agent, although a polyether chain and an anti-aging agent structure also exist in the system, the polyether chain is not fixed with the N-cyclohexyl p-methoxyaniline structure, is easy to wind and cannot play a good role, and the N-cyclohexyl p-methoxyaniline introduced as a small molecule is easy to dissociate or even precipitate and cannot effectively play a role for a long time, so that the bending resistance and the aging resistance are obviously reduced; comparative example 2 the aging performance was further reduced by replacing the flexible antioxidant with polyether acrylate.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A high tenacity polyimide rupture membrane, includes polyimide layer and sclerosis layer, its characterized in that: the hardened layer comprises the following components in parts by weight: 80-100 parts of high-functionality polyurethane acrylate, 20-30 parts of flexible anti-aging agent, 10-20 parts of reactive diluent, 1-3 parts of photoinitiator, 10-20 parts of nano particles, 0.05-1 part of anti-fingerprint agent and 80-150 parts of solvent.
2. The high tenacity polyimide rupture membrane of claim 1, wherein: the flexible anti-aging agent is a reaction product of 4-methoxy-N- (4-aminocyclohexyl) aniline and polyethylene glycol dicarboxylic acid, and the structural formula is as follows:
3. the high tenacity polyimide rupture membrane of claim 2, wherein: the molecular weight of the polyethylene glycol dicarboxylic acid is not less than 200.
4. The high tenacity polyimide rupture membrane of claim 3, wherein: the molecular weight of the polyethylene glycol dicarboxylic acid is 400-1000.
5. The high tenacity polyimide rupture membrane of claim 1, wherein: the high-functionality polyurethane acrylate is a polyurethane acrylate with the functionality of more than 6.
6. The high tenacity polyimide rupture membrane of claim 1, wherein: the active diluent is one or more of tripropylene glycol diacrylate, trimethylolpropane triacrylate, isobornyl methacrylate, pentaerythritol triacrylate, isodecyl acrylate and polyethoxyethyl acrylate.
7. The high tenacity polyimide rupture membrane of claim 1, wherein: the photoinitiator is one or more of phenyl bis (2,4, 6-trimethylbenzoyl) phosphine oxide, 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide, 4-phenyl benzophenone, 2-hydroxy-2-methyl-1-phenyl acetone, 1-hydroxycyclohexyl phenyl ketone and isopropyl thioxanthone.
8. The high tenacity polyimide rupture membrane of claim 1, wherein: the fingerprint resisting agent is perfluorovinyl ether reactive surfactant.
9. The high tenacity polyimide rupture membrane of claim 1, wherein: the nano particles are one or two of nano silicon dioxide modified by a silane coupling agent KH-570 and nano titanium dioxide modified by the silane coupling agent KH-570.
10. The high tenacity polyimide rupture membrane of claim 1, wherein: the solvent is one or more of methyl ethyl ketone, propylene glycol monomethyl ether, isopropanol, n-butyl acetate, butanone and methyl isobutyl ketone.
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| CN115873461A (en) * | 2022-11-22 | 2023-03-31 | 江苏日久光电股份有限公司 | Bending-resistant coating and bending-resistant film |
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| CN110358125A (en) * | 2019-07-22 | 2019-10-22 | 新恒东薄膜材料（常州）有限公司 | A kind of clear polyimides cured film of high-hardness, wearable lower shrinkage |
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| CN110358125A (en) * | 2019-07-22 | 2019-10-22 | 新恒东薄膜材料（常州）有限公司 | A kind of clear polyimides cured film of high-hardness, wearable lower shrinkage |
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