CN-122011992-A - UV-curing-delaying packaging adhesive for OLED display panel, OLED display panel and manufacturing method of OLED display panel

Abstract

The disclosure provides a delayed UV curing encapsulation compound for an OLED display panel, an OLED display panel and a manufacturing method of the OLED display panel. The UV curing delaying packaging adhesive for the OLED display panel comprises 40-70 parts of glycidyl ether epoxy resin, 1-10 parts of oxetane resin, 30-50 parts of nanoscale filler, 0.1-1 part of defoamer, 0.1-2 parts of photoinitiator, 0.1-2 parts of dispersing agent, 0.1-5 parts of PS (polystyrene) microsphere and 0.1-1 part of organic delay curing agent. The organic delayed curing agent is used for reducing the viscosity of the delayed UV curing packaging adhesive for the OLED display panel after UV pre-curing, so that the viscosity of the delayed UV curing packaging adhesive for the OLED display panel after UV pre-curing operation is 400 P.S-1600 P.S in the pressing and fixing operation process. The delayed UV curing packaging adhesive for the OLED display panel not only can prevent external water oxygen or pollutants from entering the box dam structure, but also can prevent the fill adhesive from overflowing from the box dam structure.

Inventors

• LI WENYU
• HAO JIANGUO
• HUANG BIWEI
• MENG LINGBIN

Assignees

• 惠州硕贝德半导体材料有限公司

Dates

Publication Date

20260512

Application Date

20251224

Claims (10)

1. 1. The delayed UV curing packaging adhesive for the OLED display panel is used for constructing a dam structure on an OLED display substrate, and is characterized by comprising the following components in percentage by mass: wherein, the organic delay curing agent is synthesized by the following synthesis paths: R 1 is isophorone diisocyanate; r 2 is polycarbonate diol; R 3 is oxetane resin; r 4 is an intermediate synthetic compound; The organic delayed-curing agent is used for absorbing the photoinitiator to generate protonic acid during the UV pre-curing operation so as to delay the curing of the delayed-UV curing packaging adhesive for the OLED display panel; The organic delayed curing agent is used for reducing the viscosity of the delayed UV curing packaging adhesive for the OLED display panel after UV pre-curing, so that the viscosity of the delayed UV curing packaging adhesive for the OLED display panel after UV pre-curing operation is 400 P.S-1600 P.S in the pressing and fixing operation process of the OLED display substrate and the glass plate.
2. 2. The delayed UV curing encapsulation adhesive for an OLED display panel according to claim 1, wherein the viscosity of the delayed UV curing encapsulation adhesive for an OLED display panel after UV pre-curing operation is 400P S to 1600P S for 20min.
3. 3. The delayed UV curing encapsulation glue for an OLED display panel of claim 1, wherein in one embodiment the glycidyl ether epoxy resin is one of the following compounds:
4. 4. The delayed UV curing encapsulation glue for an OLED display panel of claim 1, wherein R 3 is at least one of the following compounds B 1 -B 10 :
5. 5. The delayed UV curing encapsulation glue for an OLED display panel of claim 1 wherein the photoinitiator is a sulfonium salt.
6. 6. The delayed UV-curable encapsulating compound for an OLED display panel of claim 1 wherein said sulfonium salt comprises at least one of a triarylsulfonium salt, a triphenylsulfonium salt, a diphenylmethyl sulfonium salt, a bis (4-methoxyphenyl) sulfonium salt and a tributylsulfonium salt, and/or, The nano-scale filler comprises at least one of nano-scale silicon dioxide, nano-scale hydrotalcite, nano-scale talcum powder, nano-scale montmorillonite and nano-scale calcium carbonate, and/or, The defoaming agent is organic silicon defoaming agent and/or, The dispersing agent is a DISPERBYK-110 series, and/or, The PS microspheres are SBX series 10-micron PS microspheres.
7. 7. The delayed UV curing encapsulation glue for an OLED display panel of claim 1, wherein the method of synthesizing the organic delayed curing agent comprises: Placing R 1 and R 2 into a reactor according to a preset mass ratio, and adding a catalyst; The temperature in the reactor is regulated to 75-85 ℃ so that R 1 and R 2 react for 240-300 min to obtain R 4 ; After R 4 was obtained, R 3 was continuously added to the reactor until the NCO groups of R 4 were completely reacted to obtain the organic delay curing agent R 5 .
8. 8. The delayed UV cure encapsulation glue for an OLED display panel of claim 7, wherein the catalyst is organotin (DBTDL).
9. 9. An OLED display panel comprising an OLED display substrate and a glass plate, wherein the dam structure is formed on the OLED display substrate by using the delayed UV-curing encapsulation adhesive for an OLED display panel according to any one of claims 1 to 8 to seal a gap between the OLED display substrate and the glass plate, the dam structure is formed with a dam seal area, and the fill adhesive between the OLED display substrate and the glass plate is filled in the dam seal area.
10. 10. A manufacturing method of OLED display panel is characterized in that, a method for manufacturing the OLED display panel of claim 9, the method comprising: Obtaining the prepared OLED display substrate; Performing a first dispensing operation on a dispensing area of the OLED display substrate by adopting the delayed UV curing packaging adhesive for the OLED display panel so as to construct the dam structure on the OLED display substrate; Performing a second glue dispensing operation on the blocking area of the surrounding dam of the OLED display substrate by using the fill glue so that the fill glue is filled in the blocking area of the surrounding dam; Carrying out UV pre-curing operation on the OLED display substrate after the second dispensing operation, wherein the temperature of the UV pre-curing is 24.5-25.5 ℃, the power of a UV lamp is 100mw/cm 2 -110mw/cm 2 , and the energy is 1000mj/cm 2- 1500mj/cm 2 ; Performing pressing operation on the OLED display substrate and the glass plate after the UV pre-curing operation is finished, so that the glass plate sealing cover is arranged at the opening of the box dam structure and forms a box dam sealing cavity together with the box dam sealing area to seal the gap between the OLED display substrate and the glass plate, and obtaining an OLED display panel semi-finished product; And performing complete curing operation on the OLED display panel semi-finished product to enable the delayed UV curing packaging adhesive for the OLED display panel and the fill adhesive to be completely cured, so as to obtain the OLED display panel.

Description

UV-curing-delaying packaging adhesive for OLED display panel, OLED display panel and manufacturing method of OLED display panel Technical Field The disclosure relates to the technical field of production processes of OLED display panels, and in particular relates to a delayed UV curing packaging adhesive for an OLED display panel, an OLED display panel and a manufacturing method of the OLED display panel. Background With the continuous breakthrough of display technology, the OLED display panel assembly exhibits incomparable advantages such as higher contrast, wider color gamut, faster response speed and stronger morphological flexibility (supporting bending and folding) by virtue of self-luminescence characteristics, so that the OLED display panel assembly gradually becomes a main stream product of display market. Meanwhile, the visual demand of consumers on film and television works and game pictures is continuously improved, and the OLED display panel assembly is further promoted to develop towards the large-size direction. The OLED display panel currently on the market generally comprises an OLED display substrate and a glass plate, and the OLED display substrate and the glass plate are pressed and fixed together by filling glue (filling glue). The organic material of the luminous layer of the OLED display substrate has high requirements, meanwhile, the organic device of the OLED display substrate is very sensitive to water vapor, oxygen and pollutants possibly existing in the atmosphere, cannot be polluted or corroded by water and oxygen, if the organic device of the OLED display substrate is polluted or corroded by water and oxygen, the service life of the OLED display panel is directly shortened, therefore, a layer of packaging glue is generally coated to protect the organic material and used for forming an enclosure structure at the edge of the OLED display substrate, and after the OLED display substrate and the glass plate are pressed and fixed, the packaging glue can effectively seal the gap between the OLED display substrate and the glass plate so as to seal and protect the organic material of the OLED display substrate, isolate water and oxygen and other pollutants, and enable the service life of the OLED panel to be longer. DAM glue (also called as a DAM glue) belongs to one type of packaging glue and can effectively isolate water and oxygen and pollutants from entering into organic materials. The current industry generally adopts a cooperative packaging scheme of DAM glue (DAM glue) +fill glue (filling glue) to protect organic materials, wherein the fill glue has excellent leveling property, can uniformly fill gaps, and is easy to diffuse to non-dispensing areas, so that a DAM structure is required to be built by depending on the DAM glue to limit the flowing range of the DAM structure. However, DAM glue for OLED display panels on the market has the following defects that on one hand, deformation and collapse are easy to occur when the DAM glue is dispensed to an OLED display substrate, on the other hand, in the lamination process of the OLED display substrate and a glass plate, lamination abnormality is easy to occur due to the fact that the viscosity of the DAM glue is large, gaps are formed between the DAM glue and the glass plate, external water oxygen and pollutants can be easily caused to invade the inside of a DAM structure formed by the DAM glue, fill glue can overflow from the inside of the DAM structure, even under the serious condition that effective lamination cannot be performed, reworking treatment is needed, and production quality and production efficiency of the OLED display panel are greatly reduced. Disclosure of Invention The invention aims to overcome the defects in the prior art and provide a delayed UV curing packaging adhesive for an OLED display panel, an OLED display panel and a manufacturing method of the OLED display panel, wherein the OLED display substrate and a glass plate can be effectively pressed and fixed. The aim of the disclosure is achieved by the following technical scheme: the delayed UV curing packaging adhesive for the OLED display panel is used for constructing a dam structure on an OLED display substrate and comprises the following components in percentage by mass: wherein, the organic delay curing agent is synthesized by the following synthesis paths: R 1 is isophorone diisocyanate; r 2 is polycarbonate diol; R 3 is oxetane resin; r 4 is an intermediate synthetic compound; The organic delayed-curing agent is used for absorbing the photoinitiator to generate protonic acid during the UV pre-curing operation so as to delay the curing of the delayed-UV curing packaging adhesive for the OLED display panel; The organic delayed curing agent is used for reducing the viscosity of the delayed UV curing packaging adhesive for the OLED display panel after UV pre-curing, so that the viscosity of the delayed UV curing packaging adhesive for the OLED display panel a