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Optical composite film and preparation method thereof
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An optical composite film and optical technology, applied in the direction of adhesive type, polyurea/polyurethane adhesive, film/sheet adhesive, etc., can solve the problems of poor performance of TPU adhesive layer and achieve stable performance Effect
Active Publication Date: 2020-02-04
NINGBO HUGHSTAR ADVANCED MATERIAL TECH
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Problems solved by technology
[0004] In order to overcome the deficiencies in the prior art, the object of the present invention is to provide an optical composite film and a preparation method thereof, which solves the problem of poor performance of the TPU adhesive layer in the prior art due to incomplete curing of the TPU adhesive layer
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preparation example Construction
[0021] The present invention also provides a method for preparing the above-mentioned optical composite film, comprising the following steps:
[0022] S1, providing an optical base film;
[0023] S2, coating the homogeneously mixed polyol and at least two isocyanates of different molecular weights on the optical base film, and forming a TPU adhesive layer after curing.
[0024] Uniformly mixed polyols and at least two isocyanates with different molecular weights are coated on the optical base film by coating, which enhances the adhesion between the TPU adhesive layer and the optical base film on the one hand, and simplifies the process on the other hand. , so that the production yield is greatly improved. The TPU adhesive layer is formed by thick coating. Due to its excellent flexibility, the flexibility of the optical composite film is also good, and it can be applied to the field of foldable optical films.
[0025] In some embodiments, the above-mentioned polyol is a diol,...
Embodiment 1
[0033] The optical composite film is prepared through the following steps:
[0034] (1) Provide PET optical base film;
[0035] (2) getting the molar ratio is 0.5:1 polyethylene glycol and polyhexamethylene adipate, getting TDI and IPDI that the weight ratio is 3:2, the mol ratio of isocyanate group and hydroxyl is 0.8:1, the above All raw materials are mixed and evenly coated on the PET optical base film, and a TPU adhesive layer is obtained after curing, and the thickness of the TPU adhesive layer is 30 μm.
Embodiment 2
[0037] The optical composite film is prepared through the following steps:
[0038] (1) Provide PC optical base film;
[0039] (2) It is 0.6:1 polyethylene glycol and polyhexamethylene adipate that take molar ratio, take the IPDI, MDI and HMDI that take weight ratio as 3:3:2, the mol ratio of isocyanate group and hydroxyl is 0.85: 1. Mix the above raw materials and apply them evenly on the PC optical base film, and obtain a TPU adhesive layer after curing. The thickness of the TPU adhesive layer is 50 μm.
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Abstract
The invention discloses an optical composite film and a preparation method thereof. The optical composite film comprises an optical base film and a TPU (thermoplasticpolyurethane) glue layer arrangedon the same; the TPU glue layer is made from a polyol and at least two isocyanates different in molecular weight. The at least two isocyanates different in molecular weight are used as curing agents;the isocyanate with low molecular weight easily migrates to the surface of the glue layer during heating so that the surface of the glue layer is solidified first; the isocyanurate with high molecular weight migrates relatively slowly, is limited by the solidified glue layer from migrating up, and can be solidified only below the solidified glue layer; therefore, the TPU glue layer that is more thoroughly solidified is attained, and the optical composite film has more stable performance.
Description
technical field [0001] The invention relates to an optical composite film and a preparation method thereof. Background technique [0002] Optical film materials, benefiting from their excellent optical properties, are widely used in the fields of optical material preparation and optoelectronic technology. However, the above-mentioned optical film itself has defects such as poor processability and mechanical properties, which greatly restricts its application in fields such as curved screens and foldables that have high requirements for the processability of the material itself. [0003] By introducing a thermoplasticpolyurethaneelastomer (TPU) film with good plasticity, flexibility and weather resistance, and laminating it with an optical film, a TPU optical composite film with excellent processing performance can be obtained. Due to the strong viscosity of the TPU film itself, it is easy to stick together when the single layer is curled during the bonding process, which ...
Claims
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Application Information
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