WO2014201825A1 - 封框胶及其制备方法、含所述封框胶的液晶显示面板和液晶显示器 - Google Patents

封框胶及其制备方法、含所述封框胶的液晶显示面板和液晶显示器 Download PDF

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Publication number
WO2014201825A1
WO2014201825A1 PCT/CN2013/089603 CN2013089603W WO2014201825A1 WO 2014201825 A1 WO2014201825 A1 WO 2014201825A1 CN 2013089603 W CN2013089603 W CN 2013089603W WO 2014201825 A1 WO2014201825 A1 WO 2014201825A1
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Prior art keywords
liquid crystal
resin
sealant
anion exchange
viscosity
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Ceased
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PCT/CN2013/089603
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English (en)
French (fr)
Inventor
肖昂
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BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
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Priority to US14/236,175 priority Critical patent/US9904118B2/en
Publication of WO2014201825A1 publication Critical patent/WO2014201825A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1339Gaskets; Spacers; Sealing of cells
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04Homopolymers or copolymers of esters
    • C09J133/06Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/08Homopolymers or copolymers of acrylic acid esters
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04Homopolymers or copolymers of esters
    • C09J133/14Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J4/00Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00Electrical equipment
    • B32B2457/20Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/202LCD, i.e. liquid crystal displays
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F222/00Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
    • C08F222/10Esters
    • C08F222/1006Esters of polyhydric alcohols or polyhydric phenols
    • C08F222/106Esters of polycondensation macromers
    • C08F222/1067Esters of polycondensation macromers of alcohol terminated epoxy functional polymers, e.g. epoxy(meth)acrylates
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/05Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/05Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
    • C09K2323/055Epoxy
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509Filters, e.g. light shielding masks
    • G02F1/133514Colour filters
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00Materials and properties
    • G02F2202/02Materials and properties organic material
    • G02F2202/022Materials and properties organic material polymeric
    • G02F2202/023Materials and properties organic material polymeric curable

Definitions

  • liquid crystal display panel and liquid crystal display comprising the sealant
  • Embodiments of the present invention relate to a sealant and a method of preparing the same, a liquid crystal display panel including the sealant, and a liquid crystal display. Background technique
  • liquid crystal display In the production process of liquid crystal display (LCD), the manufacturing process of liquid crystal display panel directly affects the quality of liquid crystal display.
  • Liquid crystal panels have been manufactured mainly by liquid crystal injection. In order to improve the production efficiency of the liquid crystal panel manufacturing method, it is often perfused by a liquid crystal dropping method.
  • the method is as follows: (1) coating a sealant on a transparent substrate to form a frame for filling a liquid crystal; (2) dropping tiny liquid crystal droplets in the frame; (3) being uncured in the sealant The two substrates are bonded under vacuum; (4) The sealant is cured to form a liquid crystal panel.
  • the frame sealant used is often a frame sealant composed of a thermosetting epoxy resin and a photocurable (fluorenyl) acrylic resin.
  • this frame sealant although it is used in a small amount, it has a similar polarity to the liquid crystal, so when the uncured sealant is in direct contact with the liquid crystal, there will be some groups in the uncured sealant. Dissolving in the liquid crystal causes contamination of the liquid crystal, thereby affecting the reliability of the liquid crystal panel.
  • the contact time of the uncured sealant and the liquid crystal is often reduced to reduce the contamination of the impurity ions in the sealant into the liquid crystal, but the improved method is still small for the small size product. It is unavoidable that the uncured sealant is in contact with the liquid crystal and enters the liquid crystal molecules to cause contamination.
  • the present disclosure is directed to providing a frame sealant capable of avoiding contamination of a liquid crystal by an uncured sealant and a method of preparing the same.
  • Embodiments of the present invention provide a frame sealant, comprising:
  • a curable resin, an anion exchange resin, a photoinitiator, a thermosetting agent, a coupling agent, an organic filler, and an inorganic filler is a mixture of a low viscosity epoxy acrylic photocurable resin and an epoxy resin; the molecular structure of the low viscosity epoxy acrylic photocurable resin is:
  • 1 ⁇ and R 2 are the same or different, and both 1 and R 2 represent an alkyl group having 1 to 4 carbon atoms.
  • the weight percentage of the low viscosity epoxy acrylic photocurable resin, epoxy resin, anion exchange resin, photoinitiator, heat curing agent, coupling agent, organic filler and inorganic filler in the sealant For:
  • Inorganic filler 5% ⁇ 12%.
  • the anion exchange resin is a crosslinked copolymer resin having a styrene-divinylbenzene structure.
  • the anion exchange resin is a high temperature anion exchange resin and is resistant to temperatures ranging from 120 ° C to 200 ° C.
  • the anion exchange resin accounts for 1% of the total weight of the sealant.
  • the embodiment of the invention provides a method for preparing the sealant, and the method comprises the following steps: Step 1: Weigh a curable resin, an anion exchange resin, a photoinitiator, a heat curing agent, a coupling agent, an organic filler, and an inorganic filler. Heavy, and preliminary mixing;
  • Step 2 kneading the initially mixed raw materials to obtain a kneaded product
  • Step 3 Defoaming the kneaded product
  • Step 4 Adjusting the viscosity of the kneaded mixture after defoaming
  • Step 5 filtering and adjusting the viscosity-adjusted mixture
  • Step 6 Place the filtered and mixed mixture in a light-shielded container for storage.
  • the step 2 is carried out at a temperature of 30 ° C to 50 ° C
  • the step 1, the step 3 to the step 6 are carried out at a room temperature of 23 ° C to 25 ° C.
  • the number of kneading in the step 2 is 2 to 3 times, and the kneading time is 15 to 35 minutes each time.
  • the number of defoaming in the step 3 is 2 to 3 times
  • the defoaming time is 30 to 50 minutes each time
  • the pressure in the defoaming box is less than 200 Pa.
  • step 4 a low-viscosity epoxy acrylic photocurable resin is added for viscosity adjustment, and the adjusted viscosity ranges from 150 to 250 Pa ⁇ s.
  • the steps 1 to 5 are operated in a clean environment of 10,000 cleanliness, and the step 6 is operated in a clean environment of 1 thousand cleanliness.
  • Embodiments of the present invention provide a liquid crystal display panel including an array substrate and a color filter substrate, and a frame sealant as described above is disposed between the array substrate and the color filter substrate.
  • Embodiments of the present invention provide a liquid crystal display including the liquid crystal display panel as described above.
  • FIG. 1 is a flow chart of a process for preparing a sealant in an embodiment of the present invention
  • FIG. 2 is a comparison diagram of a frame sealant and a conventional frame sealant according to an embodiment of the present invention. detailed description
  • Embodiments of the present invention provide a frame sealant comprising a curable resin, an anion exchange resin, a photoinitiator, a heat curing agent, a coupling agent, an organic filler, and an inorganic filler.
  • the anion exchange resin can better adsorb the impurity ions and small molecules present in the sealant.
  • the anion exchange resin in the sealant can adsorb the impurity ions and small molecules in the sealant to prevent the impurity ions and small molecules in the sealant from entering the liquid crystal. It causes pollution.
  • the anion exchange resin may be a crosslinked copolymer resin having a styrene-divinylbenzene structure, and since it has a polarity similar to that of a low-viscosity epoxy acrylate photocurable resin, it can be preferably mixed therein.
  • examples thereof are, for example but not limited to, macroporous weakly basic styrene anion exchange resins available from Hebei Huazhong Chemical Co., Ltd.
  • the anion exchange resin herein may also be selected from a high temperature anion exchange resin which is resistant to temperatures ranging from 120 ° C to 200 ° C. Examples include, but are not limited to, chlorine type D206 resin available from Xi'an Power Resin Factory.
  • the maximum temperature does not exceed 120 °C.
  • the anion exchange resin in this temperature range can be used to stabilize the sealant in the later processing and better adsorb impurities. Ions and small molecules.
  • the photoinitiator is an alkyl benzophenone compound, and any one of ⁇ , ⁇ -diethoxyacetophenone, ⁇ -hydroxyalkylphenone, and ⁇ -aminoalkylbenzophenone may be used; the heat curing agent may be used. It is a polyamine; the coupling agent may be a silane coupling agent such as ⁇ -aminopropyltriethoxysilane; the inorganic filler may be a surface treated silica sphere having a diameter of about 1.0 ⁇ ⁇ 2.0 ⁇ ; organic The filler can be made of an elastic rubber ball with a diameter of about 0.1 ⁇ ⁇ 1.0 ⁇ .
  • the frame sealant provided by the embodiment of the invention is provided with an anion exchange resin, which can well adsorb impurity ions and small molecules.
  • an anion exchange resin which can well adsorb impurity ions and small molecules.
  • the curable resin is a mixture of a low-viscosity epoxy acrylate photocurable resin and an epoxy resin; and the molecular structure of the low-viscosity epoxy acrylate photocurable resin is:
  • 1 ⁇ and R 2 are the same or different, and both 1 and R 2 represent an alkyl group having 1 to 4 carbon atoms.
  • the above alkyl group having 1 to 4 carbon atoms may be selected from the group consisting of an anthracenyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, and a t-butyl group.
  • the low viscosity epoxy acrylic photocurable resin can be obtained by reacting an epoxy resin with an alkyl acrylate resin.
  • the alkyl group of the alkyl acrylate resin is an alkyl group having a steric effect such as a tert-butyl group or the like.
  • the low-viscosity epoxy acrylate photocurable resin obtained by such a reaction also has a good steric effect, thereby shortening the twisting range of the long chain of the polymer in space and enhancing the rigidity of the sealant before curing.
  • the epoxy resin can be any epoxy resin known in the art for this purpose.
  • the epoxy resin used may include, but is not limited to, commercially available E-41/E-51 bisphenol A epoxy resin.
  • the weight of the low-viscosity epoxy acrylic photocurable resin, epoxy resin, anion exchange resin, photoinitiator, heat curing agent, coupling agent, organic filler, inorganic filler The percentages are:
  • Anion exchange resin 0.8% ⁇ 1.5%; Photoinitiator 0.1% ⁇ 0.5%;
  • Embodiments of the present invention provide a component formulation of a frame sealant.
  • the content of the low-viscosity epoxy acrylate photocurable resin in the curable resin is usually 60 wt% to 70 wt%, because when the content is less than 60 wt%, the heat curing reaction becomes slow, and liquid crystal is used.
  • the sealant will cause the viscosity to decrease due to the thermal expansion of the liquid crystal, which causes the sealant to break.
  • the content exceeds 70 wt%, the sealant cannot obtain sufficient adhesive strength.
  • the content of the epoxy resin in the curable resin is usually from 5 wt% to 7 wt%, because when the content is less than 5 wt%, the adhesion strength is weak, and when it is more than 7 wt%, the heat curing reaction is changed. It is also easy to break.
  • the other raw material in the component is an anion exchange resin, which is a crosslinked copolymer resin having a styrene-divinylbenzene structure, and the content is usually 0.8 wt% to 1.5 wt%, which is mainly used for adsorbing the sealant in the sealant. Impurity ions and small molecules.
  • the frame sealant provided by the embodiment not only can improve the rigidity of the sealant in the uncured state, but also avoids the deformation of the sealant during the impact of the liquid crystal and the entry of external impurity ions due to the deformation.
  • the contamination of the liquid crystal by the sealant can better adsorb the impurity ions and small molecules in the sealant, avoiding the contamination of the impurity ions and small molecules in the sealant into the liquid crystal, thus making it better. Improve the quality of liquid crystal panels.
  • the embodiment of the invention further provides a preparation method of the above sealant. As shown in Figure 1, the method includes the following steps:
  • Step 1 The curing resin, the anion exchange resin, the photoinitiator, the heat curing agent, the coupling agent, the organic filler, and the inorganic filler are weighed and initially mixed;
  • the curable resin in this step may be a mixture of a low viscosity epoxy acrylic photocurable resin and an epoxy resin; the molecular structure of the low viscosity epoxy acrylic photocurable resin is:
  • 1 ⁇ and 1 2 are the same or different, and both 1 and R 2 represent an alkyl group having 1 to 4 carbon atoms.
  • component content in the embodiment of the present invention is a preferred formulation of the sealant, and the common component or common technical means determines or adjusts the weight percentage of the above components.
  • Step 2 kneading the initially mixed raw materials to obtain a kneaded product
  • the preliminary mixed raw materials are added to an internal mixer and mechanically mixed and tempered to achieve a uniform and dispersed state.
  • the temperature range in this step should be controlled within 30 ° C ⁇ 50 ° C, the number of mixing times is 2 ⁇ 3 times, and the mixing time is 15 ⁇ 35 minutes each time, so that the raw materials reach a better mixing state. .
  • the embodiments of the present invention are not limited thereto, and those skilled in the art may determine or adjust the above according to the disclosure of the present invention and the common knowledge or common technical means in the art or the weight of the frame sealant to be prepared.
  • the number of times of mixing and time for example, the weight of the frame sealant to be prepared is large, and the number and time of mixing can be increased to make it sufficiently mixed.
  • Step 3 Defoaming the kneaded product
  • the kneaded product obtained in the above step is placed in a defoaming box to be defoamed to remove bubbles in the kneaded product, so that the kneaded product is uniformly mixed and dispersed.
  • a defoaming box For example, the number of defoaming times is 1-3 times, the defoaming time is 30 to 50 minutes each time, and the pressure in the defoaming box is less than 200 Pascals.
  • Step 4 Adjusting the viscosity of the kneaded mixture after defoaming
  • the viscosity is adjusted by adding a low-viscosity epoxy acrylic photocurable resin.
  • the viscosity of the adjusted kneaded material ranges from 150 to 250 Pa ⁇ s.
  • the viscosity adjustment is critical to the quality of the sealant. If the mixture reaches the above viscosity range, the subsequent steps can be continued. If the above viscosity range is exceeded or not reached, the sealant should be re-prepared. Step 5: filtering and adjusting the viscosity-adjusted mixture;
  • the insoluble matter in the kneaded material is removed in this step so that the kneaded material is smooth and fine as a whole.
  • the number of filtering is 2 times.
  • Step 6 Place the filtered and mixed mixture in a light-shielded container for storage.
  • this step the prepared sealant is sealed and stored so as not to be contaminated before the liquid crystal panel is produced.
  • this step is performed in a clean environment with a cleanliness of 1 thousand.
  • the steps 1 to 5 can be operated in a clean environment with a cleanliness level of 10,000.
  • step 2 is completed in the temperature range of 30 ° C to 50 ° C, and the rest of the steps are performed at room temperature of 23 ° C to 25 ° C. .
  • an anion exchange resin is added to the sealant, so that the uncured sealant can adsorb the sealant through the anion exchange resin when it is in direct contact with the liquid crystal.
  • the impurity ions and small molecules in the medium are prevented from entering the liquid crystal to cause contamination thereof, thereby improving the display effect and the service life of the liquid crystal display panel.
  • the method compared with the preparation method of the sealant in the prior art, the method requires a short heat curing time and has the advantage of rapid curing, thereby improving process efficiency and reducing cost.
  • the embodiment of the invention further provides a liquid crystal display panel.
  • the liquid crystal display panel includes an array substrate and a color filter substrate, and the sealant is disposed between the array substrate and the color filter substrate.
  • the rigidity of the sealant used and the adsorption of impurity ions are enhanced, so that the sealant is better prevented from contaminating the liquid crystal in contact with the liquid crystal. , thereby improving the performance of the liquid crystal panel.
  • Embodiments of the present invention also provide a liquid crystal display device.
  • the liquid crystal display device includes the above liquid crystal display panel.
  • the sealant provided in the color filter substrate and the array substrate in the liquid crystal panel has enhanced rigidity and adsorption of impurity ions, so that the sealant is in the liquid crystal Avoid contact with it Dyeing, thereby improving the performance of the liquid crystal panel, thereby improving the quality of the liquid crystal display device.
  • the liquid crystal display panel including the sealant, and the liquid crystal display detailed description will be given below with specific embodiments.
  • the content of each component in the examples is in weight percent unless otherwise specified.
  • the mixed raw materials were placed in an internal mixer, and the temperature was controlled at about 35 to 40 ° C, and the mixture was kneaded three times for 15 minutes each time.
  • the kneaded mixture obtained after kneading was placed in a defoaming box having a pressure of less than 200 Pa at a temperature of 23 ° C for 2 times for 30 minutes each time.
  • the kneaded material after defoaming was adjusted for viscosity by adding a low-viscosity epoxy acrylate photocurable resin, and the viscosity of the kneaded product after adjustment was 180 Pa.
  • the viscosity-adjusted kneaded material was filtered and removed, and finally placed in a polyethylene bottle for storage.
  • the low-viscosity epoxy acrylic photocurable resin as described in Example 1 was weighed 67%, epoxy resin (E-51, Beijing Jintong Letai Chemical Products Co., Ltd.) 6.5% , Anion exchange resin (macroporous weakly basic styrene anion exchange resin, Hebei Huazhong Chemical Co., Ltd.) 1.3%, photoinitiator ( ⁇ , ⁇ -diethoxyacetophenone, Shanghai Zhixin Chemical Co., Ltd.) 0.4%, heat curing agent ( ⁇ , ⁇ -dimercaptoaminopropylamine, Shanghai dissolved Solvent Chemical Co., Ltd.) 9%, coupling agent (Kh550, Guangzhou Zhongjie Chemical Technology Co., Ltd.) 0.8%, organic filler (silicone microspheres, US MSE, diameter 0.1 ⁇ 1.0 ⁇ ) 6% and inorganic filler ( Silica ball, Natoco Japan, diameter 1.0 ⁇ 2.0 ⁇ ) 9%, preliminary mixing.
  • epoxy resin E-51, Beijing Jintong
  • the mixed raw materials were placed in an internal mixer, and the temperature was controlled at about 40 ° C, and kneaded three times for 20 minutes each time.
  • the kneaded product obtained after the kneading was placed in a defoaming box having a pressure of less than 200 Pa at a temperature of 25 ° C for 2 times for 30 minutes each time.
  • the kneaded material after defoaming was adjusted for viscosity by adding a low-viscosity epoxy acrylate photocurable resin, and the viscosity of the adjusted kneaded product reached 200 Pa ⁇ s.
  • the viscosity-adjusted kneaded material was filtered and removed, and finally placed in a polyvinyl chloride bottle for storage.
  • the mixed raw materials were placed in an internal mixer, and the temperature was controlled at about 45 ° C, and the mixture was kneaded three times for 25 minutes each time.
  • the kneaded product obtained after the kneading was placed in a defoaming box having a pressure of less than 200 Pa for 2 times at a temperature of 24 ° C for 30 minutes each time.
  • the kneaded material after defoaming was adjusted for viscosity by adding a low-viscosity epoxy acrylate photocurable resin, and the viscosity of the adjusted kneaded product reached 220 Pa ⁇ s.
  • the viscosity-adjusted kneaded material was filtered and removed, and finally placed in a polyethylene bottle for storage.
  • the frame sealant in Examples 1 to 3 was subjected to a pollution test separately from the conventional frame sealant (UR2920, Mitsui Chemicals).
  • FIG. 2 is a comparison diagram of contamination experiments between a frame sealant and a conventional frame sealant according to an embodiment of the present invention.
  • 2 is a schematic view of the glass frame coated with the sealant of the present invention after the vacuum is placed on the box, and the sealant coated on the right side of the glass substrate is in contact with the edge of the liquid crystal;
  • b in FIG. 2 is A schematic view of a glass substrate coated with a conventional frame sealant after the vacuum is placed on the cell, and the sealant coated on the right side is in contact with the edge of the liquid crystal.
  • the left side of a in FIG. 2 is a liquid crystal, and the right side is a frame sealant provided by an embodiment of the present invention.
  • the boundary between the liquid crystal area and the sealant area is distinct, and the sealant on the right side does not contaminate the liquid crystal on the left side.
  • the left side of the b is liquid crystal
  • the right side is the traditional frame sealant. It can be seen that the boundary between the liquid crystal area and the sealant area is blurred, and the sealant on the right side partially penetrates into the liquid crystal area, wherein the middle is The area where the black ellipse is cut out is the contaminated liquid crystal area when the conventional sealant is in contact with the liquid crystal.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Sealing Material Composition (AREA)

Abstract

一种封框胶及其制备方法、含有所述封框胶的液晶显示面板和液晶显示器。所述封框胶由固化性树脂、阴离子交换树脂、光引发剂、热固化剂、偶联剂、有机填料、无机填料组成。

Description

封框胶及其制备方法、 含所述封框胶的液晶显示面板和液晶显示器 技术领域
本发明实施例涉及一种封框胶及其制备方法、 含所述封框胶的液 晶显示面板和液晶显示器。 背景技术
在液晶显示器 ( Liquid Crystal Display, LCD ) 的制作过程中, 液 晶显示面板的制作工艺直接影响着液晶显示器的品质。 一直以来, 液 晶面板主要是通过液晶注入法来制造。 为了提高液晶面板制造方法的 生产效率, 常采用液晶滴下法对其进行灌注。 该方法如下: ( 1 )在透 明基板上涂布封框胶从而形成用于填充液晶的框; (2 )在上述框内滴 下微小的液晶微滴; (3 )在封框胶未固化的状态下将 2片基板在真空 下进行贴合; (4 ) 使封框胶固化形成液晶面板。
在上述方法中, 所使用的封框胶多采用兼具热固化性的环氧树脂 和光固化性的 (曱基) 丙烯酸树脂组成的封框胶。 对于这种封框胶而 言, 虽然用量较少, 但因其与液晶有着相似的极性, 所以未固化的封 框胶在与液晶直接接触时, 未固化的封框胶中会有部分组分溶在液晶 中, 对液晶造成污染, 从而对液晶面板的可靠性造成影响。
在现有的改良方法中, 常采用减少未固化的封框胶与液晶的接触 时间以减轻封框胶中杂质离子进入液晶对其造成污染, 但是这种改良 方法对于小尺寸产品而言, 还是无法避免未固化的封框胶与液晶接触 时, 进入到液晶分子中对其造成的污染。 本公开旨在提供一种能够避 免未固化封框胶对液晶造成污染的封框胶及其制备方法。 发明内容
本发明的实施例提供一种封框胶, 其包含:
固化性树脂、 阴离子交换树脂、 光引发剂、 热固化剂、 偶联剂、 有机填料、 无机填料。 所述固化性树脂为低粘度环氧丙烯酸光固化树脂和环氧树脂的混 合物; 所述低粘度环氧丙烯酸光固化树脂分子结构式为:
Figure imgf000003_0001
其中, 1^和 R2相同或不同, 1^和 R2均代表碳原子数为 1 ~ 4的烷 基。
所述的低粘度环氧丙烯酸光固化树脂、 环氧树脂、 阴离子交换树 脂、 光引发剂、 热固化剂、 偶联剂、 有机填料、 无机填料在所述封框 胶中的重量百分含量分别为:
低粘度环氧丙烯酸光固化树脂 60%~70%;
环氧树脂 5%~7%;
阴离子交换树脂 0.8% ~ 1.5%;
光引发剂 0.1% ~ 0.5%;
热固化剂 5%~ 10%;
偶联剂 0.5% ~ 1%;
有机填料 4% ~ 8%;
无机填料 5%~ 12%。
所述的阴离子交换树脂为具有苯乙烯-二乙烯基苯结构的交联共 聚物树脂。
所述的阴离子交换树脂为耐高温阴离子交换树脂, 耐受的温度范 围在 120°C ~ 200 °C。
所述的阴离子交换树脂占封框胶总重量的 1%。
本发明实施例提供所述封框胶的制备方法, 所述方法包括: 步骤 1: 将固化性树脂、 阴离子交换树脂、 光引发剂、 热固化剂、 偶联剂、 有机填料、 无机填料进行称重, 并初步混合;
步骤 2: 将初步混合后的原料进行混炼, 得到混炼物;
步骤 3: 将混炼物进行脱泡; 步骤 4: 将脱泡后的混炼物进行黏度调整;
步骤 5 : 将黏度调整后的混炼物进行过滤除杂;
步骤 6: 将过滤除杂后的混炼物放置在遮光容器中保存。
例如, 所述步骤 2在 30 °C ~ 50 °C的温度内进行, 步骤 1、 步骤 3 至步骤 6在 23 °C ~ 25 °C的室温下进行。
例如, 所述步骤 2中的混炼次数为 2 ~ 3次, 混炼时间为每次 15 ~ 35分钟。
例如, 所述步骤 3中脱泡次数为 2 ~ 3次, 脱泡时间为每次 30 ~ 50 分钟, 且脱泡箱内压强小于 200帕。
例如, 所述步骤 4 中加入低粘度环氧丙烯酸光固化树脂进行黏度 调整, 调整后黏度范围为 150 ~ 250帕 ·秒。
例如, 所述步骤 1至 5是在洁净度 1万级的洁净环境下操作的, 步骤 6是在洁净度 1千级的洁净环境下操作的。
本发明实施例提供一种液晶显示面板, 包括阵列基板和彩膜基板, 在所述阵列基板和所述彩膜基板之间设置有如上所述的封框胶。
本发明实施例提供一种液晶显示器, 包括如上所述的液晶显示面 板。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案, 下面 将对实施例或现有技术描述中所需要使用的附图作筒单地介绍, 显而 易见地, 下面描述中的附图仅仅是本发明的一些实施例, 对于本领域 普通技术人员来讲, 在不付出创造性劳动性的前提下, 还可以根据这 些附图获得其他的附图。
图 1为本发明实施例中用于制备封框胶的工艺流程图;
图 2 为本发明实施例提供的封框胶与传统的封框胶进行污染实验 后的对比图。 具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术方 案进行清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部 分实施例, 而不是全部的实施例。 基于本发明中的实施例, 本领域普 通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范围。
下面结合附图对本发明实施例提供的封框胶及其制备方法、 含所 述封框胶的液晶显示面板和液晶显示器进行详细描述。
本发明实施例提供了一种封框胶, 其包含固化性树脂、 阴离子交 换树脂、 光引发剂、 热固化剂、 偶联剂、 有机填料、 无机填料。
阴离子交换树脂可以较好地吸附所述封框胶中存在的杂质离子和 小分子。 当未固化的封框胶与液晶直接接触时, 封框胶中的阴离子交 换树脂可以吸附封框胶中的杂质离子和小分子, 避免封框胶中的杂质 离子和小分子进入到液晶中对其造成污染。
例如, 阴离子交换树脂可为具有苯乙烯 -二乙烯基苯结构的交联共 聚物树脂, 因其极性与低粘度环氧丙烯酸光固化树脂相似, 因此可以 较好地混在其中。 其实例诸如但不限于, 得自河北华众化工有限公司 的大孔弱碱性苯乙烯系阴离子交换树脂。 这里的阴离子交换树脂还可 以选用耐高温阴离子交换树脂, 其耐受的温度范围在 120 °C ~ 200 °C , 其实例包括但不限于得自西安电力树脂厂的氯型 D206树脂。因为封框 胶在后期的紫外照射和光固化的过程中, 最高温度不超过 120 °C , 选用 此温度范围的阴离子交换树脂, 可以使封框胶在后期的加工中性能稳 定, 更好地吸附杂质离子和小分子。
所述光引发剂为烷苯酮类化合物, 可以选用 α,α-二乙氧基苯乙酮、 α-羟烷基苯酮、 α-胺烷基苯酮的任一种; 热固化剂可以为多元胺; 偶联 剂可以为硅烷偶联剂, 如 γ-氨丙基三乙氧基硅烷; 无机填料可以选用 经表面处理过的二氧化硅球, 直径约为 1.0μηι ~ 2.0μηι; 有机填料可以 选用弹性橡胶球, 直径约为 0.1 μηι ~ 1.0μηι。
本发明实施例提供的封框胶, 加入了阴离子交换树脂, 其能够很 好地吸附杂质离子和小分子。 在未固化的封框胶与液晶直接接触时, 避免了封框胶中的杂质离子和小分子进入到液晶中对其造成的污染, 从而较好地提高液晶显示面板的显示效果和使用寿命, 提高液晶显示 器件的品质。
例如, 所述固化性树脂为低粘度环氧丙烯酸光固化树脂和环氧树 脂的混合物; 所述低粘度环氧丙烯酸光固化树脂分子结构式为:
Figure imgf000006_0001
其中, 1^和 R2相同或不同, 1^和 R2均代表碳原子数为 1 ~ 4的烷 基。
上述碳原子数为 1 ~ 4的烷基可以选自曱基、 乙基、 丙基、异丙基、 丁基、 异丁基、 叔丁基。
低粘度环氧丙烯酸光固化树脂可通过使环氧树脂与烷基丙烯酸树 脂反应得到。
例如, 烷基丙烯酸树脂的烷基为具有立体效应的烷基基团, 如叔 丁基等。 这样反应得到的低粘度环氧丙烯酸光固化树脂也会具有较好 的立体效应, 从而使该聚合物长链在空间的扭动范围缩小, 增强封框 胶在固化前的刚性。 当液晶滴入封框胶封闭的区域内, 并与该未固化 的封框胶接触时, 未固化的封框胶可以很好地抵住液晶滴入时产生的 沖击, 避免了封框胶的变形以及因变形而使外界杂质离子进入封框胶 对液晶产生的污染。
所述环氧树脂可以为本领域中已知的用于此种目的的任何环氧树 脂。 例如, 所用的环氧树脂可包括但不限于商购 E-41/E-51 双酚 A环 氧树脂。
在本发明实施例提供的封框胶中, 所述低粘度环氧丙烯酸光固化 树脂、 环氧树脂、 阴离子交换树脂、 光引发剂、 热固化剂、 偶联剂、 有机填料、 无机填料的重量百分含量分别为:
低粘度环氧丙烯酸光固化树脂 60% ~ 70%;
环氧树脂 5% ~ 7%;
阴离子交换树脂 0.8% ~ 1.5%; 光引发剂 0.1% ~ 0.5%;
热固化剂 5% ~ 10%;
偶联剂 0.5% ~ 1 %;
有机填料 4% ~ 8%;
无机填料 5% ~ 12%。
本发明实施例提供了一种封框胶的组分配方。 其中固化性树脂中 的低粘度环氧丙烯酸光固化树脂在封框胶中的含量通常为 60 wt% ~ 70 wt% , 因为当含量小于 60 wt%时, 热固化反应会变緩, 在采用液晶滴下工 艺制作时, 封框胶会由于液晶受热膨胀而引起黏度降低, 从而导致封框胶破 裂; 当含量超过 70 wt%时, 封框胶又不能得到充分的粘附强度。 另外, 固化 性树脂中的环氧树脂的含量通常为 5 wt% - 7 wt%, 因为当含量小于 5 wt% 时, 其粘附强度变弱, 而大于 7 wt%时, 由于热固化反应变緩, 也易于发生 破裂。 组分中的另一原料为阴离子交换树脂, 是具有苯乙烯-二乙烯基 苯结构的交联共聚物树脂, 含量通常为 0.8 wt% ~ 1.5 wt% , 主要是用 来吸附封框胶中的杂质离子和小分子。
本实施例提供的这种封框胶, 不但可以很好地提高封框胶在未固 化时的刚性, 避免了封框胶在受到液晶沖击时产生的变形以及因变形 而使外界杂质离子进入封框胶对液晶产生的污染, 还能较好的吸附封 框胶中的杂质离子和小分子, 避免封框胶中的杂质离子和小分子进入 到液晶中对其造成的污染, 从而更好地提高液晶面板的品质。
本发明实施例还提供了上述封框胶的制备方法。 如图 1 所示, 本 方法包括如下步骤:
步骤 1 : 将固化型树脂、 阴离子交换树脂、 光引发剂、 热固化剂、 偶联剂、 有机填料、 无机填料进行称重, 并初步混合;
本步骤中的固化性树脂可以为低粘度环氧丙烯酸光固化树脂和环 氧树脂的混合物; 所述低粘度环氧丙烯酸光固化树脂分子结构式为:
Figure imgf000007_0001
其中, 1^和 1 2相同或不同, 1^和 R2均代表碳原子数为 1-4的烷 基。
例如, 本步骤中, 按封框胶的总重量计, 称取低粘度环氧丙烯酸 光固化树脂 60% ~ 70%、 环氧树脂 5% ~ 7%、 阴离子交换树脂 0.8% ~ 1.5%、 光引发剂 0.1% ~ 0.5%、 热固化剂 5% ~ 10%、 偶联剂 0.5% ~ 1%、 有机填料 4% ~ 8%和无机填料 5% ~ 12%加入到密炼机中进行初步混合。
可以理解的是, 本发明实施例中的组分含量为封框胶的优选配方, 知常识或常用技术手段确定或调整上述组分的重量百分含量。
步骤 2 : 将初步混合后的原料进行混炼, 得到混炼物;
本步骤中, 将初步混合的原料加入到密炼机中经过机械混合翻炼达到 均匀、 分散的状态。 例如, 本步骤进行的温度范围应该控制在 30°C ~ 50°C 内, 混炼次数为 2 ~ 3 次, 混炼时间为每次 15 ~ 35分钟, 以使原料达 到较好的混炼状态。
可以理解的是, 本发明实施例并不限于此, 本领域技术人员可根 据本发明公开的内容及本领域公知常识或常用技术手段或所需制备的 封框胶重量的不同来确定或调整上述的混炼次数和时间, 例如所需制 备的封框胶的重量大, 可增加混炼的次数和时间以使其充分混合均匀。
步骤 3 : 将混炼物进行脱泡;
本步骤中, 将上步得到的混炼物放入脱泡箱进行脱泡, 以脱去混 炼物中的气泡,使混炼物得到均匀的混合和分散。例如,脱泡次数为 1 ~ 3次,脱泡时间为每次 30 ~ 50分钟, 且脱泡箱内压强小于 200帕斯卡。
可以理解的是, 本发明实施例并不限于此, 本领域技术人员可根 据本发明公开的内容及本领域公知常识或常用技术手段来确定或调整 上述的脱泡的次数和时间。
步骤 4: 将脱泡后的混炼物进行黏度调整;
本步骤中, 通过加入低粘度环氧丙烯酸光固化树脂来进行黏度调 整, 调整后的混炼物的黏度范围为 150 ~ 250 帕 ·秒, 黏度调整对封框 胶的质量至关重要, 只有使混炼物达到上述黏度范围才可继续后续步 骤, 如超出或达不到上述黏度范围, 封框胶则应重新制备。 步骤 5 : 将黏度调整后的混炼物进行过滤除杂;
本步骤中除去的为混炼物中的不溶物, 以使混炼物从整体上平滑 细腻。 例如, 过滤次数为 2次。
可以理解的是, 本发明实施例并不限于此, 本领域技术人员可根 据本发明公开的内容及本领域公知常识或常用技术手段确定上述过滤 过程的次数。
步骤 6: 将过滤除杂后的混炼物放置在遮光容器中保存。
本步骤中, 将制备好的封框胶密封保存, 以使其不会在液晶面板 生产之前受到污染。 例如, 本步骤是在洁净度 1 千级的洁净环境下操 作的。
所述步骤 1至 5可在洁净度 1万级的洁净环境下操作。
需要说明的是,以上封框胶的制作步骤中,只有步骤 2是在 30 °C ~ 50 °C的温度范围内完成的, 其余步骤均是在 23 °C ~ 25 °C的室温下完成 的。
在本发明实施例提供的封框胶的制备方法中, 向封框胶中加入了 阴离子交换树脂, 使得未固化的封框胶在与液晶直接接触时, 通过该 阴离子交换树脂可以吸附封框胶中的杂质离子和小分子, 避免其进入 到液晶中对其造成污染, 从而较好地提高了液晶显示面板的显示效果 和使用寿命。 另外, 相对于现有技术中的封框胶的制备方法, 本方法 所需的热固化时间短, 具有快速固化的优势, 从而提高了工艺效率并 降低了成本。
本发明实施例还提供了一种液晶显示面板。 所述液晶显示面板包 括阵列基板和彩膜基板, 在所述阵列基板和所述彩膜基板之间设置有 所述封框胶。 在本发明实施例提供的液晶显示面板中, 由于所用的封 框胶的刚性及对杂质离子的吸附作用都得到了增强, 使得封框胶在与 液晶接触中较好地避免了对液晶的污染, 从而提高了液晶面板的性能。
本发明实施例还提供了一种液晶显示器件。 所述液晶显示器件包 括上述液晶显示面板。 在本发明实施例提供的液晶显示器件中, 由于 在其液晶面板中的彩膜基板和阵列基板中设置的封框胶具有增强的刚 性及对杂质离子的吸附作用, 使得封框胶在与液晶接触中避免对其污 染, 从而提高了液晶面板的性能, 进而提高了液晶显示器件的品质。 为了更好说明所述封框胶及其制备方法、 含该封框胶的液晶显示 面板和液晶显示器, 下面以具体实施例进行详细说明。 除非特别说明, 实施例中各组分的含量均以重量百分比计。
实施例 1
在 23 °C的温度下, 分别称取低粘度环氧丙烯酸光固化树脂
Figure imgf000010_0001
( 1^和 1 2均为曱基) 60%、 环氧树脂 (E-51 , 北京市津同乐泰化 工产品有限公司 ) 7%、 阴离子交换树脂 (大孔弱碱性苯乙烯系阴离子 交换树脂, 河北华众化工有限公司 ) 1.5%、 光引发剂 (α,α-二乙氧基苯 乙酮, 上海至鑫化工有限公司 ) 0.5%、 热固化剂 (Ν,Ν-二曱基氨基丙 胺, 上海溶溶化工有限公司 ) 10%、 偶联剂 (Kh550, 广州市中杰化工 科技有限公司 ) 1%、 有机填料 (有机硅微球, 美国 MSE , 直径 0.1μηι~1.0μηι ) 8%和无机填料 (二氧化硅球, 日本 Natoco , 直径 1.0μηι~2.0μηι ) 12%, 进行初步混合。将上述混合后的原料加入到密炼机中, 控制温度在 35~40°C左右, 混炼 3次, 每次 15分钟。 在 23 °C的温度下, 将混炼后得到的混炼物放置在压强小于 200 帕的脱泡箱中进行脱泡 2 次, 每次 30分钟。 将脱泡后的混炼物通过加入低粘度环氧丙烯酸光固 化树脂进行黏度调整, 调整后的混炼物的粘度达到 180 帕 ,秒。 将黏 度调整后的混炼物进行过滤除杂, 最后放置在聚乙烯瓶中保存。
实施例 2
在 25 °C的温度下, 分别称取如实施例 1所述的低粘度环氧丙烯酸 光固化树脂 67%、 环氧树脂 (E-51 , 北京市津同乐泰化工产品有限公 司 ) 6.5%、 阴离子交换树脂 (大孔弱碱性苯乙烯系阴离子交换树脂, 河北华众化工有限公司 ) 1.3%、 光引发剂 ( α,α-二乙氧基苯乙酮, 上海 至鑫化工有限公司 ) 0.4%、 热固化剂 (Ν,Ν-二曱基氨基丙胺, 上海溶 溶化工有限公司 )9%、偶联剂(Kh550, 广州市中杰化工科技有限公司 ) 0.8%、 有机填料 (有机硅微球, 美国 MSE , 直径 0.1 μηι~1.0μηι ) 6%和 无机填料 (二氧化硅球, 日本 Natoco , 直径 1.0μηι~2.0μηι ) 9%, 进行 初步混合。 将上述混合后的原料加入到密炼机中, 控制温度在 40 °C左右, 混炼 3次, 每次 20分钟。 在 25 °C的温度下, 将混炼后得到的混炼物放 置在压强小于 200帕的脱泡箱中进行脱泡 2次, 每次 30分钟。 将脱泡 后的混炼物通过加入低粘度环氧丙烯酸光固化树脂进行黏度调整, 调 整后的混炼物的粘度达到 200 帕 ·秒。 将黏度调整后的混炼物进行过 滤除杂, 最后放置在聚氯乙烯瓶中保存。
实施例 3
在 24 °C的温度下, 分别称取如实施例 1所述的低粘度环氧丙烯酸 光固化树脂 70%、 环氧树脂 (E-51 , 北京市津同乐泰化工产品有限公 司 ) 6%、 阴离子交换树脂 (大孔弱碱性苯乙烯系阴离子交换树脂, 河 北华众化工有限公司 ) 1%、 光引发剂 ( α,α-二乙氧基苯乙酮, 上海至 鑫化工有限公司 ) 0.3%、 热固化剂 (Ν,Ν-二曱基氨基丙胺, 上海溶溶 化工有限公司 ) 8%、 偶联剂 (Kh550, 广州市中杰化工科技有限公司 ) 0.7%、 有机填料 (有机硅微球, 美国 MSE , 直径 0.1 μηι~1.0μηι ) 6%和 无机填料 (二氧化硅球, 日本 Natoco , 直径 1 ·0μηι~2·0μηι ) 8%, 进行 初步混合。 将上述混合后的原料加入到密炼机中, 控制温度在 45 °C左右, 混炼 3次, 每次 25分钟。 在 24 °C的温度下, 将混炼后得到的混炼物放 置在压强小于 200帕的脱泡箱中进行脱泡 2次, 每次 30分钟。 将脱泡 后的混炼物通过加入低粘度环氧丙烯酸光固化树脂进行黏度调整, 调 整后的混炼物的粘度达到 220 帕 ·秒。 将黏度调整后的混炼物进行过 滤除杂, 最后放置在聚乙烯瓶中保存。
性能测试
将实施例 1 ~ 3中的封框胶与传统的封框胶(UR2920 , 三井化学) 分别进行污染试验。
取两块相同的 40mmx45mm的白玻璃板, 在两块玻璃板上距离四 周边缘 5mm处分别涂布本发明实施例的封框胶和传统的封框胶,截面 积为 4000±400 μ m2 , 然后将两块各自涂布封框胶的白玻璃板与另外两 块 36mmx36mm的白玻璃板进行真空对盒,使两块玻璃的间隙为 5 μ m。 真空对盒放置 5分钟后经过 UV曝光( 5000mJ/cm2 )、 热固化( 120 °C , 1小时) 之后观察污染结果。
图 2 为本发明实施例提供的封框胶与传统的封框胶进行污染实验 的对比图。 图 2 中的 a是涂覆有本发明封框胶的玻璃基板在真空对盒 放置后, 在玻璃基板右侧一边上涂覆的封框胶与液晶边缘接触的示意 图; 图 2 中的 b是涂覆有传统封框胶的玻璃基板在真空对盒放置后, 右侧一边上涂覆的封框胶与液晶边缘接触的示意图。 其中, 图 2中的 a 的左侧是液晶, 右侧是本发明实施例提供的封框胶。 可以看到, 液晶 区域与封框胶区域界线分明, 右侧的封框胶并未污染左侧的液晶。 图 2 中 b 的左侧是液晶, 右侧是传统封框胶, 可以看到, 液晶区域与封框 胶区域界线模糊, 右侧的封框胶部分地渗透到液晶区域中, 其中, 中 间被黑色橢圓圏出的区域即为传统封框胶在与液晶接触时, 被污染的 液晶区域。
可见, 与右侧图 2 中的 b的传统封框胶相对比, 由于在封框胶中 添加了阴离子交换树脂, 本发明实施例提供的封框胶在与液晶接触的 界面上, 污染情况得到了有效地改善。
以上所述, 仅为本发明的具体实施方式, 但本发明的保护范围并 不局限于此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范 围内, 可轻易想到变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明的保护范围应以所述权利要求的保护范围为准。

Claims

权利要求书
1、 一种封框胶, 包含: 固化性树脂、 阴离子交换树脂、 光引发剂、 热固化剂、 偶联剂、 有机填料、 无机填料。
2、 根据权利要求 1所述的封框胶, 其中, 所述固化性树脂为低粘 度环氧丙烯酸光固化树脂和环氧树脂的混合物; 所述低粘度环氧丙烯 酸光固化树脂分子结构式为:
Figure imgf000013_0001
其中, 1^和 R2相同或不同, 1^和 R2均代表碳原子数为 1 ~ 4的烷
3、 根据权利要求 2所述的封框胶, 其中, 所述低粘度环氧丙烯酸 光固化树脂、 环氧树脂、 阴离子交换树脂、 光引发剂、 热固化剂、 偶 联剂、 有机填料和无机填料在所述封框胶中的重量百分含量分别为: 低粘度环氧丙烯酸光固化树脂 60% ~ 70%;
环氧树脂 5% ~ 7%;
阴离子交换树脂 0.8% ~ 1.5%;
光引发剂 0.1% ~ 0.5%;
热固化剂 5% ~ 10%;
偶联剂 0.5% ~ 1 %;
有机填料 4% ~ 8%;
无机填料 5% ~ 12%。
4、 根据权利要求 1或 2所述的封框胶, 其中, 所述阴离子交换树 脂为具有苯乙烯-二乙烯基苯结构的交联共聚物树脂。
5、 根据权利要求 1或 2所述的封框胶, 其中, 所述阴离子交换树 脂为耐高温阴离子交换树脂, 所耐受的温度范围在 120 °C ~ 200 °C。
6、 根据权利要求 3所述的封框胶, 其中, 所述阴离子交换树脂占 封框胶总重量的 1%。
7、 一种如权利要求 1 ~ 6所述的封框胶的制备方法, 该方法包括: 步骤 1 : 将固化性树脂、 阴离子交换树脂、 光引发剂、 热固化剂、 偶联剂、 有机填料、 无机填料进行称重, 并初步混合;
步骤 2 将初步混合后的原料进行混炼, 得到混炼物;
步骤 3 将混炼物进行脱泡;
步骤 4 将脱泡后的混炼物进行黏度调整;
步骤 5 将黏度调整后的混炼物进行过滤除杂;
步骤 6 将过滤除杂后的混炼物放置在遮光容器中保存,
8、 根据权利要求 7所述的方法, 其中, 所述步骤 2在 30°C ~ 50°C 的温度下进行, 所述步骤 1、 步骤 3至步骤 6在 23 °C ~ 25 °C的室温下 进行。
9、 根据权利要求 7所述的方法, 其中, 所述步骤 2中的混炼次数 为 2 ~ 3次, 混炼时间为每次 15 ~ 35分钟。
10、 根据权利要求 7所述的方法, 其中, 所述步骤 3 中的脱泡次 数为 2 ~ 3次, 脱泡时间为每次 30 ~ 50分钟, 且脱泡压强小于 200帕。
1 1、 根据权利要求 7所述的方法, 其中, 所述步骤 4 中通过加入 低粘度环氧丙烯酸光固化树脂对所述脱泡后的混炼物进行黏度调整, 调整后混炼物的黏度为 150 ~ 250 帕 ·秒。
12、 根据权利要求 7所述的方法, 其中, 所述步骤 1至 5是在洁 净度 1万级的洁净环境下操作的, 所述步骤 6是在洁净度 1千级的洁 净环境下操作的。
13、 一种液晶显示面板, 包括阵列基板和彩膜基板, 其中, 在所 述阵列基板和所述彩膜基板之间设置有如权利要求 1 ~ 6中任一项所述 封框胶。
14、 一种液晶显示器, 其中, 包括权利要求 13所述的液晶显示面 板。
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