UV (Ultraviolet)-cured pressure-sensitive adhesive for LCD (Liquid Crystal Display) polarizer and preparation method thereof
A technology of curing pressure and adhesive layer, applied in the direction of adhesives, film/sheet adhesives, non-polymer organic compound adhesives, etc. and other problems, to achieve the effect of avoiding thermal crosslinking process, easy crosslinking process and high production efficiency
Active Publication Date: 2015-04-29
BEIJING UNIV OF CHEM TECH
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Problems solved by technology
But there are two problems: on the one hand, it takes a long curing time to produce the required glue layer, which makes the production efficiency low; The layer modulus is too low, if the curing process is not proper, it will produce defective products
The light time should not be too low, otherwise the curing time needs to be extended to achieve complete cross-linking, which will waste time and reduce production efficiency
Method used
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Effect test
Embodiment 2
[0042] Each component is mixed uniformly by the component and proportioning of embodiment 2 in table 1. Evenly coated on the isolation film, with 20mW / cm 2 Take it out after irradiating with a high-pressure mercury lamp for 2 minutes, and you can get the adhesive layer for testing.
Embodiment 3
[0044] Each component is mixed uniformly by the component and proportioning of embodiment 2 in table 1. Evenly coated on the isolation film, with 80mW / cm 2 Take it out after irradiating with a high-pressure mercury lamp for 0.5s, and you can get the adhesive layer for testing.
Embodiment 4
[0046] Each component is mixed uniformly by the component and proportioning of embodiment 2 in table 1. Evenly coated on the isolation film, with 50mW / cm 2 Take it out after irradiating with a high-pressure mercury lamp for 1.5 minutes, and you can get the adhesive layer for testing.
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Abstract
The invention relates to a UV (Ultraviolet)-cured pressure-sensitive adhesive for an LCD (Liquid Crystal Display) polarizer and a preparation method thereof, belonging to the technical field of adhesives. A copolymer,, used as the UV-cured pressure-sensitive adhesive, is characterized by being prepared from at least following three substances in parts by weight: a. 30-60 parts of acrylate copolymer with the weight-average molecular weight of 100000-1000000 and the dispersion degree Mw / Mn of 3-10; b. 40-70 parts of UV-cured component; c. a light initiator system, wherein the sum of a and b is 100 parts, and the light initiator system is 0.5-6.5 parts relative to the sum of a and b being 100 parts. The invention avoids using a thermal crosslinking agent, has high crosslinking process speed, high production efficiency and easily controlled crosslinking process by adopting UV crosslinking, only needs the curing time of 0.5-3 min and avoids the long thermal crosslinking process of a traditional process, and moreover, the prepared pressure-sensitive adhesive can meet the needs of practical use in performance (such as initial adhesion and peel strength), the initial adhesion can be larger than a spherule No.14, and the peel strength can be larger than 9.81 N / 25mm.
Description
Technical field: [0001] The present invention relates to UV curable pressure sensitive adhesives. It belongs to the technical field of adhesives. Background technique: [0002] UV-curable pressure-sensitive tape is an adhesive that can firmly bond the adherend in a short period of time with only a small force. It is a viscoelastic substance. Rubber, acrylate, silicone, etc. are often used to prepare pressure-sensitive adhesives with different needs. In liquid crystal display products, according to different use requirements, it is necessary to coat a certain thickness of pressure-sensitive adhesive on one side of the polarizer original plate, and compound the isolation film to protect the pressure-sensitive adhesive, while on the other side, according to the product type , Composite protective film, reflective film, semi-transparent and semi-reflective film respectively. Among them, the pressure-sensitive adhesive plays an important role in bonding the original plate of t...
Claims
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IPC IPC(8): C09J4/02C09J4/06C09J7/02
Inventor 何勇蹇钰聂俊
Owner BEIJING UNIV OF CHEM TECH