A water-based glue for bonding PET film and PVA film
By using a water-based glue composed of mixed resin and deionized water of a specific ratio, the problem of insufficient adhesion performance between PET film and PVA film is solved, and the peel strength and adhesion performance are significantly improved.
Patent Information
- Application Number
- CN202411722139.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-04-04
AI Technical Summary
When the existing aqueous glue bonds to PET film and PVA film, the adhesive performance is insufficient, resulting in low peel strength between the PET film and the PVA film.
The aqueous glue consisting of 4 wt%-10 wt% mixed resin and 90 wt%-96 wt% deionized water, the mixed resin consists of 5 wt%-50 wt% PVA resin and 50 wt%-95 wt% aqueous resin, and an aqueous polyurethane resin is preferably used to improve cohesion and compatibility.
The peel strength between the PET film and the PVA film is significantly enhanced, the adhesion performance is improved, and the problems of hydrolysis and curing shrinkage are avoided.
Abstract
Description
Technical Field
[0001] The invention relates to water-based glue for bonding a PET film and a PVA film. Background Art
[0002] Light diffusion film and polarizer are important optical films in the backlight module of LCD liquid crystal display. Its main function is to convert point or linear light source into uniform surface light source, which has a uniform light effect. Diffusion film can be divided into surface diffusion film or volume diffusion film. Surface diffusion film realizes diffusion effect by coating particles or microstructures on the surface of the film; volume diffusion film is a diffusion film prepared by adding resin particles to the base resin through blending and extrusion casting. There are two polarizers at a specific angle in the upper and lower parts of the liquid crystal display. One of the polarizers converts the incident light into linear polarized light, and the other acts as an analyzer, thereby realizing the light and dark changes of the pattern. Since the surface of the volume diffusion film is flat, it can be compounded with the polarizer, so that the volume diffusion film also acts as a protective film, which can reduce the cost of using TAC film as a protective film. The base resin for making the volume diffusion film is usually PET, however, the polarizer is usually PVA film, and the bonding performance of the water-based adhesive used to bond the PVA film to the PET film is insufficient. Summary of the invention
[0003] In order to overcome the shortcomings of the water-based glue in the prior art, the present invention provides a water-based glue for bonding a PET film and a PVA film, which can enhance the peeling strength between the PET film and the PVA film.
[0004] The technical solution of the present invention to solve the technical problem is: a water-based glue for bonding PET film and PVA film, which is composed of 4wt%-10wt% of mixed resin and 90wt%-96wt% of deionized water; The mixed resin consists of 5wt%-50wt% of PVA resin and 50wt%-95wt% of water-based resin.
[0005] When the content of the mixed resin is lower than 4wt%, the time required for the glue to dry becomes longer, and the PVA film is prone to hydrolysis during the drying process; when the content of the mixed resin is higher than 10wt%, the glue shrinks and deforms severely during curing. When the content of PVA resin in the mixed resin is lower than 5wt%, the compatibility between the glue layer and the PVA film is poor, and the peel strength is low; when the PVA content is higher than 50wt%, the cohesion of the glue layer is insufficient, and the peel strength is low.
[0006] Preferably, the water-based resin is one of water-based acrylic resin, water-based alkyd resin, water-based epoxy resin, and water-based polyurethane resin. More preferably, it is water-based polyurethane resin, because water-based polyurethane resin has good hardness and toughness, low curing shrinkage and good cohesion, and has good compatibility with PVA resin.
[0007] Preferably, the PVA resin is PVA powder.
[0008] The beneficial effect of the present invention is that: the present application prepares a water-based adhesive for bonding PET film and PVA film by compounding water-based resin and PVA resin, thereby enhancing the peeling strength between the PET body diffusion film and the PVA film. DETAILED DESCRIPTION
[0009] The present invention is further described in detail below in conjunction with specific implementation modes.
[0010] Embodiment 1, a water-based glue for bonding a PET film and a PVA film, which is composed of 8wt% of a mixed resin and 92wt% of deionized water; The mixed resin consists of 30wt% PVA powder and 70wt% waterborne polyurethane resin.
[0011] Example 2: A water-based glue for bonding a PET film and a PVA film, which is composed of 4 wt % of a mixed resin and 96 wt % of deionized water; The mixed resin consists of 10wt% PVA powder and 90wt% water-based acrylic resin.
[0012] Example 3: A water-based glue for bonding a PET film and a PVA film, which is composed of 10 wt % of a mixed resin and 90 wt % of deionized water; The mixed resin consists of 5wt% PVA powder and 95wt% water-based alkyd resin.
[0013] Example 4: A water-based glue for bonding a PET film and a PVA film, which is composed of 5wt% of a mixed resin and 95wt% of deionized water; The mixed resin consists of 20wt% PVA powder and 80wt% water-based epoxy resin.
[0014] Example 5: A water-based glue for bonding a PET film and a PVA film, which is composed of 9wt% of a mixed resin and 91wt% of deionized water; The mixed resin consists of 35wt% PVA powder and 65wt% waterborne polyurethane resin.
[0015] Example 6: A water-based glue for bonding a PET film and a PVA film, which is composed of 6 wt % of a mixed resin and 94 wt % of deionized water; The mixed resin consists of 50wt% PVA powder and 50wt% waterborne polyurethane resin.
[0016] Example 7, a water-based glue for bonding a PET film and a PVA film, which is composed of 7wt% of a mixed resin and 93wt% of deionized water; The mixed resin consists of 40wt% PVA powder and 60wt% waterborne polyurethane resin.
[0017] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0018] The above is an explanation of the embodiments of the present invention. However, the present invention is not limited to the above embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A water-based glue for bonding PET film and PVA film, characterized in that: It consists of 4wt%-10wt% of mixed resin and 90wt%-96wt% of deionized water; The mixed resin consists of 5wt%-50wt% of PVA resin and 50wt%-95wt% of water-based resin.
2. The water-based glue according to claim 1, characterized in that: The water-based resin is one of a water-based acrylic resin, a water-based alkyd resin, a water-based epoxy resin, and a water-based polyurethane resin.
3. The water-based glue according to claim 1, characterized in that: The PVA resin is PVA powder.