Composite adhesive tape for forming high-refractive-index resin lens

Abstract

The utility model discloses a composite adhesive tape for forming a high refractive index resin lens, which comprises a base material layer and an adhesive layer, the adhesive layer is compounded on one side of the base material layer, a hydrophobic laminating film layer is compounded on the part of the adhesive layer, which is used for being contacted with resin liquid, and adhesive areas which are used for being laminated on a mold are formed on the adhesive layer and are positioned on two sides of the laminating film layer. The composite adhesive tape for forming the high-refractive-index resin lens is reasonable in design, adopts an interval compounding mode, adopts PP to be compounded on the adhesive surface, resin liquid is in contact with a PP base material, the thickness of the PP base material prevents the resin liquid from reaching the edge of a mold, the condition of contact reaction of the resin liquid and an adhesive layer does not exist, the hydrophobicity of the PP base material can also ensure that no water vapor is in contact with the resin liquid on the surface; the product quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of adhesive tapes for resin lenses, in particular to a composite adhesive tape for molding high-refractive resin lenses. Background Art

[0002] Currently, the process technology of lens manufacturers varies widely. Eyeglass lenses are classified by refractive index into low and high refractive index lenses. High refractive index lenses are generally those with a refractive index of 1.67 or higher. The resin liquid used for these lenses often contains thiol monomers. Thiols are highly polar and reactive components that are extremely sensitive to water and water vapor. Existing technology uses a silicone rubber system as the adhesive layer and a multi-layer composite film as a water barrier to protect the resin lenses during the molding process. However, in hot and humid summer weather, the silicone surface can absorb water, causing moisture to accumulate on the adhesive surface. Water vapor then penetrates the adhesive layer and contacts the monomers, reacting with the resin liquid and generating bubbles.

[0003] The existing process tapes have the following main shortcomings: 1. The adhesive layer of the tape used in the prior art is a silicone system. Silicone has certain polarity and hydrophilicity. In a high temperature and high humidity environment, it is relatively easy to introduce moisture to the surface of the adhesive layer; 2. Silicone has a certain water vapor permeability. There is a risk of water vapor permeation at the interface between the mold and the tape; 3. The adhesive surface is in direct contact with the resin liquid. Some polar components or small molecules in the adhesive layer may be compatible or reactive with the components of the resin liquid. At the same time, the resin liquid will release a large amount of heat during the process of curing into a lens, and residual adhesive will be generated at the interface between the adhesive layer and the resin liquid.

[0004] For example, patent CN118620535A discloses a silicone encapsulation tape for resin lenses and a preparation method thereof. The tape comprises a PET polyester film, an adhesive layer coated on one side of the PET polyester film, and a release layer coated on the other side of the PET polyester film. The adhesive layer is mainly made of a high-viscosity organic silicone adhesive, and the silicone has certain polarity and hydrophilicity. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the utility model provides a composite tape for high-reflectivity resin lens molding, which can effectively improve the hydrophobicity of the tape and prevent moisture from entering the lens resin liquid.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] The composite adhesive tape for molding high-refractive resin lenses comprises a base material layer and an adhesive layer, wherein the adhesive layer is composited on one side of the base material layer, a hydrophobic bonding film layer is composited on the portion of the adhesive layer that is in contact with the resin liquid, and adhesive areas for bonding to a mold are formed on both sides of the bonding film layer on the adhesive layer.

[0008] Further:

[0009] The laminating film layer is a PP film.

[0010] The substrate layer is a PET substrate layer.

[0011] The adhesive layer is a rubber system adhesive coating.

[0012] The thickness of the PP film is 30-50 μm.

[0013] The thickness of the PET substrate layer is 30-50 μm.

[0014] The thickness of the glue coating is 30-50 μm.

[0015] The width of the PP film is 3-8 mm.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The composite tape for high-refractive resin lens molding is rationally designed and adopts an interval compounding method. PP is compounded on the adhesive surface, and the resin liquid contacts the PP substrate. The thickness of the PP substrate prevents the resin liquid from reaching the edge of the mold, and there will be no contact reaction between the resin liquid and the adhesive layer. The hydrophobicity of the PP substrate can also ensure that no water vapor contacts the resin liquid on the surface, thereby improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following is a brief description of the contents and symbols in the drawings of this specification:

[0019] Figure 1 This is a schematic diagram of the tape layer structure of the utility model.

[0020] Figure 2 This is a front view of the adhesive tape of the present invention.

[0021] In the picture:

[0022] 1. PET substrate layer, 2. Adhesive layer, 3. Laminating film layer. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention will be further explained in detail below through the description of embodiments with reference to the accompanying drawings.

[0024] like Figure 1 and Figure 2 As shown, the composite tape for molding high-refractive resin lenses includes a base material layer and an adhesive layer. The adhesive layer is compounded on one side of the base material layer. The portion of the adhesive layer that is in contact with the resin liquid is compounded with a hydrophobic bonding film layer. Adhesive areas for bonding to the mold are formed on both sides of the bonding film layer on the adhesive layer.

[0025] Preferably, the laminating film layer 3 is a PP film; the base material layer is a PET base material layer 1; and the adhesive layer 2 is a rubber system adhesive coating.

[0026] The utility model has a reasonable design of the composite tape, adopts the method of interval compounding, and uses PP to compound on the adhesive surface. The resin liquid contacts the PP substrate. The thickness of the PP substrate prevents the resin liquid from reaching the edge of the mold, and there will be no contact reaction between the resin liquid and the adhesive layer. The hydrophobicity of the PP substrate can also ensure that no water vapor on the surface contacts the resin liquid, thereby improving product quality.

[0027] The thickness of the PP film, PET substrate layer and glue coating ranges from 30 to 50 μm; the width of the PP film ranges from 3 to 8 mm.

[0028] The adhesive layer of the utility model adopts a rubber system. Rubber is highly non-polar and has very poor affinity to water vapor, which can effectively prevent water vapor from penetrating. The method of spacing the composite adhesive surface is to reserve the part that plays a bonding role for fitting with the mold, and the part in contact with the resin liquid is composited with a PP base material to adhere to the adhesive surface, thereby preventing the resin liquid from directly contacting the adhesive surface. The selected composite PP film has a certain thickness so that the resin liquid will not reach the edge of the mold over a large area, thereby reducing the risk of leakage. In addition, the PP composite adhesive surface is directly in contact with the resin liquid. The hydrophobicity of PP can ensure that moisture will not be brought into the resin liquid due to contact.

[0029] The specific implementation process is:

[0030] Rubber preparation: Add various rubber blocks to toluene solvent in a certain proportion and heat at 85 degrees to dissolve them. Food-grade rubber is preferred to avoid additives. Raw materials have good compatibility in toluene solvent.

[0031] Coating: The tape substrate is preferably high-temperature resistant PET, while PP is relatively heat-resistant. First, the PET substrate is corona treated to enhance adhesion, with a corona voltage of 0.8kV. Glue is then applied directly to the treated surface of the PET, and then laminated to the PP roll. The PP width is 3-8mm, with a spacing of 6-12mm. After the roll is rolled, there is a 3-8mm wide PP gap every 6-12mm. The adhesive surface does not contact the original film surface, eliminating the need for a release film. Coating speed: 1.0m / min, oven temperature: 90 / 115 / 135 / 115°C, ensuring it exceeds the boiling point of toluene.

[0032] Slitting: Cutting is done along the middle of each 6-12mm wide adhesive strip using a ceramic blade. The ceramic blade will not overheat and cause the adhesive to break after long-term continuous operation. Slitting speed is 20m / min and the strips are directly reeled.

[0033] Application: Place the tape on the mold roller and wind it. Adjust the tape height and align it with the mold position so that the adhesive layers on both sides of the tape are directly attached to the mold and the middle composite layer penetrates into the mold.

[0034] The adhesive layer of the utility model is a non-polar, highly hydrophobic rubber system, which can effectively prevent water vapor from penetrating the adhesive surface and the mold bonding position, and can also prevent water vapor from penetrating the substrate from the front into the resin liquid and causing a reaction; the highly hydrophobic PP film itself will not introduce moisture; the composite of the PP film can prevent the adhesive surface and the resin liquid from directly contacting over a large area, effectively avoiding the resin liquid reaction and interface residual adhesive problems caused by the precipitation of polar components or small molecules in the adhesive layer; at the same time, the PP substrate is directly composited on the original adhesive surface. Because the film material has a certain thickness, the position of the PP film is between the height of the resin liquid and the adhesive layer, and the resin liquid cannot continue to rise to cover the periphery of the mold and leak.

[0035] The above is only an illustration of a preferred embodiment of the present invention. The above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0036] The above is an exemplary description of the present invention in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A composite tape for molding high-refractive resin lenses, comprising a substrate layer and an adhesive layer, wherein the adhesive layer is laminated on one side of the substrate layer, and characterized in that: The portion of the adhesive layer that is in contact with the resin liquid is compounded with a hydrophobic laminating film layer, and adhesive areas for laminating to the mold are formed on both sides of the adhesive layer.

2. The composite adhesive tape for forming high-refractive resin lenses according to claim 1, characterized in that: The laminating film layer is a PP film.

3. The composite adhesive tape for forming high-refractive resin lenses according to claim 1, characterized in that: The substrate layer is a PET substrate layer.

4. The composite adhesive tape for forming high-refractive resin lenses according to claim 1, characterized in that: The adhesive layer is a rubber system adhesive coating.

5. The composite adhesive tape for forming high-refractive resin lenses according to claim 2, characterized in that: The thickness of the PP film is 30-50 μm.

6. The composite adhesive tape for forming high-refractive resin lenses according to claim 3, characterized in that: The thickness of the PET substrate layer is 30-50 μm.

7. The composite adhesive tape for forming high-refractive resin lenses according to claim 4, characterized in that: The thickness of the glue coating is 30-50 μm.

8. The composite adhesive tape for forming high-refractive resin lenses according to claim 5, characterized in that: The width of the PP film is 3-8 mm.

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