Recently, liquid crystal display (LCD) is widely used in large-sized applications such as notebook, monitor, and television. To achieve seamless characteristics of displays, the LCD device needs a narrow bezel design. The narrow bezel designs for displays require sealants that possess high-performan...
Recently, liquid crystal display (LCD) is widely used in large-sized applications such as notebook, monitor, and television. To achieve seamless characteristics of displays, the LCD device needs a narrow bezel design. The narrow bezel designs for displays require sealants that possess high-performance mechanical properties, such as high adhesive properties, low moisture permeability, and low liquid crystal (LC) contamination. For these reasons, UV/heat dual curable adhesive attracting attention. Dual cure adhesives can be cured with heat and UV using epoxy resin and acrylate resin, which can greatly reduce the uncured rate. Especially epoxy resin is a thermosetting resin, and it has high adhesion and curing rate through its unique network structure. Epoxy resin has good physical properties such as chemical resistance and excellent adhesion. On account of these properties, epoxy resin is widely used in protective coating, electrical laminates, and adhesive. Especially, epoxy resin used in LCD adhesive is an important material for bonding between device substrates through heat curing process. For forming the network structure, the curing agent including amine groups can be reacted with epoxy resins under certain heat condition through epoxy ring opening reaction. These curing agents are essential for epoxy adhesives, and various types of curing agents can be used depending on the conditions of use. Therefore, we have introduced various kinds of curing agents into UV/heat dual curable LCD sealant and observed changes in physical properties of the sealant according to the structure and properties of curing agent.
In this study, we evaluated properties of epoxy resin systems using different curing agent. For preparation UV/heat dual curable sealant, we were using a rotation and revolution mixer (Thinky mixer) for uniformly dispersion of materials. To analyze the synthesized epoxy resin curing systems, we used differential scanning calorimetry (DSC) and Fourier transform infrared (FT-IR). The characteristic of latent curing agent was obvserved in exothermal analysis usind DSC measurement and it provided possibility that latent curing agent can use in LCD sealant. And the adhesive and shear strengths were measured with a universal testing machine (UTM) at room temperature. As the bulkness of spacer structure increase, the impact sensitivity decrease and flexibility increase. This properties caused good elongation and adhesive strength when a external force is applied. Furthermore, to confirm whether the LCs had been contaminated, the fabricated sample cell was examined using polarized optical microscopy (POM). Lastly, we confirmed electro-optical properties of sealant to evaluating effect of non-reactive components to liquid crystal after UV/heat curing process. In this result, as the LC pollution area decrease, the electro-optical properties increase like threshold voltage and response time. Because the LC pollution area have an influenced on alignment properties of LCs, the position switching of LCs, from vertically to horizontality, are defected.
Recently, liquid crystal display (LCD) is widely used in large-sized applications such as notebook, monitor, and television. To achieve seamless characteristics of displays, the LCD device needs a narrow bezel design. The narrow bezel designs for displays require sealants that possess high-performance mechanical properties, such as high adhesive properties, low moisture permeability, and low liquid crystal (LC) contamination. For these reasons, UV/heat dual curable adhesive attracting attention. Dual cure adhesives can be cured with heat and UV using epoxy resin and acrylate resin, which can greatly reduce the uncured rate. Especially epoxy resin is a thermosetting resin, and it has high adhesion and curing rate through its unique network structure. Epoxy resin has good physical properties such as chemical resistance and excellent adhesion. On account of these properties, epoxy resin is widely used in protective coating, electrical laminates, and adhesive. Especially, epoxy resin used in LCD adhesive is an important material for bonding between device substrates through heat curing process. For forming the network structure, the curing agent including amine groups can be reacted with epoxy resins under certain heat condition through epoxy ring opening reaction. These curing agents are essential for epoxy adhesives, and various types of curing agents can be used depending on the conditions of use. Therefore, we have introduced various kinds of curing agents into UV/heat dual curable LCD sealant and observed changes in physical properties of the sealant according to the structure and properties of curing agent.
In this study, we evaluated properties of epoxy resin systems using different curing agent. For preparation UV/heat dual curable sealant, we were using a rotation and revolution mixer (Thinky mixer) for uniformly dispersion of materials. To analyze the synthesized epoxy resin curing systems, we used differential scanning calorimetry (DSC) and Fourier transform infrared (FT-IR). The characteristic of latent curing agent was obvserved in exothermal analysis usind DSC measurement and it provided possibility that latent curing agent can use in LCD sealant. And the adhesive and shear strengths were measured with a universal testing machine (UTM) at room temperature. As the bulkness of spacer structure increase, the impact sensitivity decrease and flexibility increase. This properties caused good elongation and adhesive strength when a external force is applied. Furthermore, to confirm whether the LCs had been contaminated, the fabricated sample cell was examined using polarized optical microscopy (POM). Lastly, we confirmed electro-optical properties of sealant to evaluating effect of non-reactive components to liquid crystal after UV/heat curing process. In this result, as the LC pollution area decrease, the electro-optical properties increase like threshold voltage and response time. Because the LC pollution area have an influenced on alignment properties of LCs, the position switching of LCs, from vertically to horizontality, are defected.
주제어
#UV.heat dual curing sealant curing agent
※ AI-Helper는 부적절한 답변을 할 수 있습니다.