Special packaging adhesive tape for polyurethane optical lens and preparation method of special packaging adhesive tape

Abstract

The invention discloses a special packaging adhesive tape for a polyurethane optical lens and a preparation method of the special packaging adhesive tape, and belongs to the technical field of preparation of lens adhesives. The preparation method comprises the following steps: mixing isocyanate, polydimethylsiloxane, a dihydric alcohol mixture, an organic solvent and a catalyst according to a weight part ratio of (0.4-0.6): (1-1.2): (0.2-0.3): (1-1.5): (0.001-0.003), and reacting to obtain a compound solution; mixing the composite liquid, acrylate and a photoinitiator according to a weight part ratio of 1: 1: (0.1-0.2), stirring and defoaming to obtain a composite adhesive liquid, blade-coating the composite adhesive liquid to a base material, curing by ultraviolet radiation, and rolling to obtain the packaging adhesive tape. The packaging adhesive tape with low shrinkage curing rate and good light transmission is obtained by compounding the composite adhesive liquid, then coating the composite adhesive liquid on the base material in a blade coating manner and carrying out ultraviolet curing.

Description

Technical Field

[0001] The invention belongs to the technical field of lens adhesive preparation, and particularly relates to a polyurethane optical lens special packaging tape and a preparation method thereof. Background Art

[0002] Optical lenses are optical components that change the direction of light propagation by refracting and reflecting light. They play a key role in various applications, including glasses, cameras, telescopes, microscopes, lasers, and many other optical devices. Optical lenses are usually made of optical glass or plastic materials (such as polycarbonate, polyurethane, and acrylic resin). In the manufacturing and assembly process of optical lenses, tape plays an important role. Tape is mainly used in the following aspects: (1) Fixing optical lenses: During the production and testing of lenses, tape can be used to fix lenses in a specific position for processes such as cutting, polishing, and coating; (2) Auxiliary tools in the assembly process: In the assembly of optical systems, tape can be used to temporarily fix different optical components together to ensure that they are in the correct position and aligned. This is particularly important during the optical debugging process; (3) Protection and sealing: During transportation and storage, tape can be used to protect the lens surface from scratches and dirt, and also to prevent the influence of moisture and air on the lens; (4) Identification and separation: During the production process, tape can be used to identify different types of lenses or separate different production batches, which helps with management and quality control.

[0003] There are several types of tapes: (1) Single-sided tape: refers to tape with an adhesive layer on only one side. Its basic structure consists of three parts: release coating, substrate and adhesive. Usually, a backing coating is applied between the areas with adhesive layers on both sides to improve the stability of the tape. (2) Double-sided tape, also known as double-sided tape, refers to tape with an adhesive layer on both sides. Its basic structure is similar to that of single-sided tape, except that it is coated with adhesive layers on both sides. This type of tape has stronger performance and is suitable for applications that require double-sided bonding. (3) Non-substrate tape, also known as release paper tape, refers to tape without a substrate. It is usually composed of release paper and adhesive. The release paper is used to increase the adhesion between the adhesive layer and the substrate surface, thereby improving the performance of the tape. This type of tape is widely used in industry, packaging and other fields.

[0004] Although adhesive tape plays an important role in the processing and assembly of optical lenses, its use may also have some negative effects on optical lenses as follows: (1) Impact on optical performance: If the adhesive or substrate of the tape does not meet the optical performance requirements, it may affect the transmittance of light, resulting in a decrease in image quality. Some tapes have low transmittance in the ultraviolet or infrared regions, which may affect the overall performance of the optical system; (2) Reflection and scattering: The surface characteristics of the tape may cause reflection and scattering of light, thereby affecting the clarity and contrast of the final image; (3) Residue: When using tape to fix or protect the lens, the adhesive of the tape may remain on the surface of the lens, causing dirt and scratches. This residue not only affects the appearance, but may also affect the optical performance; (4) Physical damage: Improper use of tape may cause scratches or damage to the lens surface, especially when the tape is torn off, it may remove the coating on the lens surface, affecting its durability and optical effect; (5) Aging phenomenon: The adhesive of the tape may age after long-term use or in a high-temperature environment, resulting in a decrease in adhesion, affecting the fixation and accuracy of the lens; (6) Temperature and humidity changes: The performance of the tape may be affected by changes in temperature and humidity, resulting in changes in its adhesion and mechanical properties, thereby affecting the stability of the optical lens.

[0005] Patent CN115044316A discloses a method for preparing a silicone tape for lens encapsulation. This invention prepares a primer coating liquid and a viscose coating liquid by selecting appropriate adhesive raw materials. The primer coating liquid is then applied to a PET film substrate, dried at high temperature, and then the viscose coating liquid is applied and dried to produce the silicone tape. Patent CN113150705A discloses a polyurethane lens molding tape and its preparation method. This invention selects appropriate polypropylene film layers, a release agent layer, a hardening layer, a silicone pressure-sensitive adhesive base layer, and a silicone pressure-sensitive adhesive top layer, then applies the layers one by one and finally dries them to produce the molding tape for polyurethane lenses.

[0006] The adhesive tape used in optical lenses must not only have excellent adhesion, but also low cure shrinkage and good light transmittance to ensure the stability of the optical lens after bonding. Therefore, how to ensure good adhesion while also having low cure shrinkage and good light transmittance is one of the main challenges in the gluing and packaging of optical lenses. Summary of the Invention

[0007] In response to the shortcomings of the prior art, the present invention solves the technical problems raised in the background art by compounding a composite adhesive liquid, then applying it to a substrate and curing it with ultraviolet light to obtain a packaging tape with a low shrinkage cure rate and good light transmittance. Specifically, the technical solution of the present invention includes the following:

[0008] A method for preparing a polyurethane optical lens packaging tape, the method comprising the following steps:

[0009] The composite adhesive liquid is scraped onto the substrate, cured by ultraviolet radiation, and then rolled up to obtain a packaging tape;

[0010] The preparation method of the composite adhesive comprises the following steps:

[0011] Isocyanate, polydimethylsiloxane, a diol mixture, an organic solvent, and a catalyst are mixed and reacted in a weight ratio of 0.4-0.6:1-1.2:0.2-0.3:1-1.5:0.001-0.003 to obtain a composite liquid;

[0012] The composite liquid, acrylate and photoinitiator are mixed in a weight ratio of 1:1:0.1-0.2, stirred and degassed to obtain a composite adhesive liquid;

[0013] The diol mixture is prepared by mixing polycarbonate diol and 1,4-butene diol in a weight ratio of 1:0.1-0.2.

[0014] Furthermore, the isocyanate includes isophorone diisocyanate.

[0015] Furthermore, the polydimethylsiloxane includes hydroxyl-terminated polydimethylsiloxane.

[0016] Furthermore, the viscosity of the hydroxyl-terminated polydimethylsiloxane is 70 mPa·s.

[0017] Furthermore, the molecular weight of the polycarbonate diol is 1000 Da.

[0018] Furthermore, the organic solvent is composed of acetone and dimethyl sulfoxide mixed in a weight ratio of 1:1.

[0019] Furthermore, the catalyst includes dibutyltin dilaurate.

[0020] Furthermore, the conditions of the mixed reaction include a reaction temperature of 70° C. to 80° C. and a reaction time of 3 h to 4 h.

[0021] Furthermore, the acrylic acid ester includes isobornyl acrylate or isobornyl methacrylate.

[0022] Furthermore, the photoinitiator includes Irgacure 184D.

[0023] Furthermore, the substrate includes a PET release film.

[0024] Furthermore, the UV curing conditions include a UV wavelength of 365 nm and an irradiation power of 500 mW / cm2 ~550mW / cm 2 And the irradiation distance is 10cm~15cm.

[0025] A packaging tape prepared by a method for preparing a special packaging tape for polyurethane optical lenses.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention first prepares a composite liquid by mixing isocyanate, polydimethylsiloxane and a diol mixture. The polydimethylsiloxane has low viscosity and light transmittance, which can not only improve the dispersibility of the isocyanate and diol during polymerization, increase the fluidity of the composite liquid, but also increase the light transmittance of the prepared packaging tape. The diol mixture contains 1,4-butanediol with a carbon-carbon double bond structure, which can be cured and cross-linked by subsequent polymerization with the carbon-carbon double bond in the acrylate under ultraviolet light irradiation. The acrylate with a curing shrinkage reduction is then introduced into the packaging tape by polymerization, thereby achieving low shrinkage and light transmittance of the packaging tape while achieving adhesion. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a physical picture of the packaging tape prepared in Example 3 of the present invention. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions of the present invention through the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] Unless otherwise specified, the raw materials and reagents used in the present invention are commercially available or can be prepared by known methods.

[0031] Preparation Example 1:

[0032] The preparation of the composite adhesive specifically includes the following processes:

[0033] Polycarbonate diol (1000 Da) was placed in a three-necked flask, and nitrogen was introduced to evacuate the air. The flask was then vacuumed to 50 Pa and heated to 110°C to remove moisture from the polycarbonate diol. 0.4 parts by weight of isophorone diisocyanate, 1 part by weight of hydroxyl-terminated polydimethylsiloxane (70 mPa·s viscosity), 0.2 parts by weight of a diol mixture (1000 Da polycarbonate diol and 1,4-butene diol in a 1:0.1 weight ratio), and 1 part by weight of an organic solvent (1:1 weight ratio of acetone and dimethyl sulfoxide) were weighed and placed in a reactor and stirred uniformly. 0.001 parts by weight of dibutyltin dilaurate was then added and stirred. Nitrogen was then introduced as a protective gas, and the mixture was heated to 70°C and stirred for 3 hours to obtain a composite solution. 1 part by weight of isobornyl acrylate and 0.1 part by weight of photoinitiator Irgacure 184D were weighed, mixed, heated to 60°C, and stirred at a speed of 1000 r / min until the initiator was dissolved and evenly dispersed. The mixture was then cooled to 40°C, and 1 part by weight of the composite liquid was added and continued to be mixed and stirred. The composite adhesive was obtained by vacuum degassing.

[0034] Preparation Example 2:

[0035] The preparation of the composite adhesive specifically includes the following processes:

[0036] Polycarbonate diol (1000 Da) was placed in a three-necked flask, and nitrogen was introduced to evacuate the air. The flask was then vacuumed to 50 Pa and heated to 110°C to remove moisture. 0.5 parts by weight of isophorone diisocyanate, 1.1 parts by weight of hydroxyl-terminated polydimethylsiloxane (70 mPa·s viscosity), 0.25 parts by weight of a diol mixture (1000 Da polycarbonate diol and 1,4-butene diol in a ratio of 1:0.15 by weight), and 1.2 parts by weight of an organic solvent (1:1 ratio of acetone and dimethyl sulfoxide) were weighed and placed in a reactor and stirred uniformly. 0.002 parts by weight of dibutyltin dilaurate was then added and stirred. Nitrogen was then introduced as a protective gas, and the mixture was heated to 75°C and stirred for 3.5 hours to obtain a composite solution. 1 part by weight of isobornyl acrylate and 0.15 part by weight of photoinitiator Irgacure 184D were weighed, mixed, heated to 60°C, and stirred at a speed of 1000 r / min until the initiator was dissolved and evenly dispersed. The mixture was then cooled to 40°C, and 1 part by weight of the composite liquid was added and continued to be mixed and stirred. The composite adhesive was obtained by vacuum degassing.

[0037] Preparation Example 3:

[0038] The preparation of the composite adhesive specifically includes the following processes:

[0039] Polycarbonate diol (1000 Da) was placed in a three-necked flask, and nitrogen was introduced to evacuate the air. The flask was then vacuumed to 50 Pa and heated to 110°C to remove moisture from the polycarbonate diol. 0.5 parts by weight of isophorone diisocyanate, 1.2 parts by weight of hydroxyl-terminated polydimethylsiloxane (70 mPa·s viscosity), 0.3 parts by weight of a diol mixture (1000 Da polycarbonate diol and 1,4-butene diol in a ratio of 1:0.15 by weight), and 1.5 parts by weight of an organic solvent (1:1 ratio of acetone and dimethyl sulfoxide) were weighed and placed in a reactor and stirred uniformly. 0.002 parts by weight of dibutyltin dilaurate was then added and stirred. Nitrogen was then introduced as a protective gas, and the mixture was heated to 75°C and stirred for 3.5 hours to obtain a composite solution. Weigh 1 part by weight of isobornyl methacrylate and 0.15 part by weight of photoinitiator Irgacure 184D, mix and heat to 60°C and stir at 1000 r / min until the initiator is dissolved and evenly dispersed, then cool to 40°C, then add 1 part by weight of the composite liquid and continue mixing and stirring, and vacuum degassing to obtain a composite adhesive.

[0040] Preparation Example 4:

[0041] The preparation of the composite adhesive specifically includes the following processes:

[0042] Polycarbonate diol (1000 Da) was placed in a three-necked flask, and nitrogen was introduced to evacuate the air. The flask was then vacuumed to 50 Pa and heated to 110°C to remove moisture. 0.6 parts by weight of isophorone diisocyanate, 1.2 parts by weight of hydroxyl-terminated polydimethylsiloxane (70 mPa·s viscosity), 0.3 parts by weight of a diol mixture (1000 Da polycarbonate diol and 1,4-butene diol in a ratio of 1:0.2 by weight), and 1.5 parts by weight of an organic solvent (1:1 by weight of acetone and dimethyl sulfoxide) were weighed and placed in a reactor and stirred uniformly. 0.003 parts by weight of dibutyltin dilaurate was then added and stirred. Nitrogen was then introduced as a protective gas, and the mixture was heated to 80°C and stirred for 4 hours to obtain a composite solution. 1 part by weight of isobornyl methacrylate and 0.2 part by weight of photoinitiator Irgacure 184D were weighed, mixed, heated to 60°C, and stirred at a speed of 1000 r / min until the initiator was dissolved and evenly dispersed. The mixture was then cooled to 40°C, and 1 part by weight of the composite liquid was added and continued to be mixed and stirred. The composite adhesive was obtained by vacuum degassing.

[0043] Preparation Example 5:

[0044] The preparation of the composite adhesive specifically includes the following processes:

[0045] The isophorone diisocyanate in Preparation Example 4 was replaced by p-phenylene diisocyanate, and the other preparation conditions were consistent with Preparation Example 4.

[0046] Preparation Example 6:

[0047] The preparation of the composite adhesive specifically includes the following processes:

[0048] The hydroxyl-terminated polydimethylsiloxane with a viscosity of 70 mPa·s in Preparation Example 4 was replaced with hydroxyl-terminated polydimethylsiloxane with a viscosity of 750 mPa·s, and the other preparation conditions were consistent with Preparation Example 4.

[0049] Preparation Example 7:

[0050] The preparation of the composite adhesive specifically includes the following processes:

[0051] The hydroxyl-terminated polydimethylsiloxane in Preparation Example 4 was replaced by methoxy-terminated polydimethylsiloxane, and the other preparation conditions were consistent with Preparation Example 4.

[0052] Preparation Example 8:

[0053] The preparation of the composite adhesive specifically includes the following processes:

[0054] The 1,4-butenediol in Preparation Example 4 was removed and not added, and the other preparation conditions remained the same as those in Preparation Example 4.

[0055] Preparation Example 9:

[0056] The preparation of the composite adhesive specifically includes the following processes:

[0057] The isobornyl methacrylate in Preparation Example 4 was replaced by hydroxyethyl acrylate, and the other preparation conditions remained the same as those in Preparation Example 4.

[0058] Example 1:

[0059] A method for preparing a polyurethane optical lens packaging tape specifically comprises the following steps:

[0060] The composite adhesive obtained in Preparation Example 1 was scraped onto one side of the PET release film surface, and the scraping thickness was controlled to be 50 μm. Then, it was placed under a UV light with a wavelength of 365 nm, and the irradiation distance of the UV light was controlled to be 10 cm. Then, the irradiation power was adjusted to 500 mW / cm 2 , then start irradiation until it is completely cured, stop irradiation, and roll up to obtain the packaging tape.

[0061] Example 2:

[0062] A method for preparing a polyurethane optical lens packaging tape specifically comprises the following steps:

[0063] The composite adhesive obtained in Preparation Example 2 was scraped onto one side of the PET release film surface, and the scraping thickness was controlled to be 50 μm. Then, it was placed under ultraviolet light with a wavelength of 365 nm, and the irradiation distance of the ultraviolet light was controlled to be 12 cm. The irradiation power was then adjusted to 520 mW / cm 2 , then start irradiation until it is completely cured, stop irradiation, and roll up to obtain the packaging tape.

[0064] Example 3:

[0065] A method for preparing a polyurethane optical lens packaging tape specifically comprises the following steps:

[0066] The composite adhesive obtained in Preparation Example 3 was scraped onto one side of the PET release film surface, and the scraping thickness was controlled to be 60 μm. Then, it was placed under a UV light with a wavelength of 365 nm, and the irradiation distance of the UV light was controlled to be 14 cm. The irradiation power was then adjusted to 540 mW / cm 2 Then start irradiation until it is completely cured, stop irradiation, and reel up to obtain the packaging tape. See the product picture. Figure 1 .

[0067] Example 4:

[0068] A method for preparing a polyurethane optical lens packaging tape specifically comprises the following steps:

[0069] The composite adhesive obtained in Preparation Example 4 was scraped onto one side of the PET release film surface, and the scraping thickness was controlled to be 60 μm. Then, it was placed under a UV light with a wavelength of 365 nm, and the irradiation distance of the UV light was controlled to be 15 cm. Then, the irradiation power was adjusted to 550 mW / cm 2 , then start irradiation until it is completely cured, stop irradiation, and roll up to obtain the packaging tape.

[0070] Comparative Example 1:

[0071] A method for preparing a polyurethane optical lens packaging tape specifically comprises the following steps:

[0072] The composite adhesive obtained in Preparation Example 5 was scraped onto one side of the PET release film surface, and the scraping thickness was controlled to be 60 μm. Then, it was placed under ultraviolet light with a wavelength of 365 nm, and the irradiation distance of the ultraviolet light was controlled to be 15 cm. Then, the irradiation power was adjusted to 550 mW / cm 2 , then start irradiation until it is completely cured, stop irradiation, and roll up to obtain the packaging tape.

[0073] Comparative Example 2:

[0074] A method for preparing a polyurethane optical lens packaging tape specifically comprises the following steps:

[0075] The composite adhesive obtained in Preparation Example 6 was scraped onto one side of the PET release film surface, and the scraping thickness was controlled to be 60 μm. Then, it was placed under a UV light with a wavelength of 365 nm, and the irradiation distance of the UV light was controlled to be 15 cm. The irradiation power was then adjusted to 550 mW / cm 2 , then start irradiation until it is completely cured, stop irradiation, and roll up to obtain the packaging tape.

[0076] Comparative Example 3:

[0077] A method for preparing a polyurethane optical lens packaging tape specifically comprises the following steps:

[0078] The composite adhesive obtained in Preparation Example 7 was scraped onto one side of the PET release film surface, and the scraping thickness was controlled to be 60 μm. Then, it was placed under ultraviolet light with a wavelength of 365 nm, and the irradiation distance of the ultraviolet light was controlled to be 15 cm. Then, the irradiation power was adjusted to 550 mW / cm 2 , then start irradiation until it is completely cured, stop irradiation, and roll up to obtain the packaging tape.

[0079] Comparative Example 4:

[0080] A method for preparing a polyurethane optical lens packaging tape specifically comprises the following steps:

[0081] The composite adhesive obtained in Preparation Example 8 was scraped onto one side of the PET release film surface, and the scraping thickness was controlled to be 60 μm. Then, it was placed under ultraviolet light with a wavelength of 365 nm, and the irradiation distance of the ultraviolet light was controlled to be 15 cm. Then, the irradiation power was adjusted to 550 mW / cm 2 , and then started irradiation. It was found that after UV irradiation treatment, the composite adhesive on the substrate failed to solidify, resulting in preparation failure. This may be because the composite adhesive lacks 1,4-butenediol with a carbon-carbon double bond structure that polymerizes with acrylate, resulting in failure to cross-link and cure.

[0082] Comparative Example 5:

[0083] A method for preparing a polyurethane optical lens packaging tape specifically comprises the following steps:

[0084] The composite adhesive obtained in Preparation Example 9 was scraped onto one side of the PET release film surface, and the scraping thickness was controlled to be 60 μm. Then, it was placed under a UV light with a wavelength of 365 nm, and the irradiation distance of the UV light was controlled to be 15 cm. The irradiation power was then adjusted to 550 mW / cm 2, then start irradiation until it is completely cured, stop irradiation, and roll up to obtain the packaging tape.

[0085] Comparative Example 6:

[0086] A method for preparing a polyurethane optical lens packaging tape specifically includes the following steps:

[0087] The composite adhesive obtained in Preparation Example 4 was scraped onto one side of the PET release film surface, and the scraping thickness was controlled to be 100 μm. Then, it was placed under ultraviolet light with a wavelength of 365 nm, and the irradiation distance of the ultraviolet light was controlled to be 15 cm. Then, the irradiation power was adjusted to 550 mW / cm 2 , then start irradiation until it is completely cured, stop irradiation, and roll up to obtain the packaging tape.

[0088] According to the ASTM D1003 Test Method for Light Transmittance and Haze of Transparent Plastics, the light transmittance of the packaging tapes obtained in Examples 1 to 4, Comparative Examples 1 to 3, and Comparative Examples 5 to 6 was measured by a spectrophotometer. The results are shown in Table 1 below.

[0089] Table 1 Light transmission performance

[0090]

[0091] The packaging tapes obtained in Examples 1-4, Comparative Examples 1-3, and Comparative Examples 5-6 were bonded between two plastic plates. After pressing for 1 minute, the bonding strength was tested in accordance with GB / T 7124-2008 at a tensile rate of 5 mm / min and an ambient temperature of 25±1°C. The results are shown in Table 2 below.

[0092] Table 2 Adhesion performance

[0093]

[0094] First, the density ρ1 of the composite adhesive used in Examples 1 to 4, Comparative Examples 1 to 3, and Comparative Examples 5 to 6 was measured, and then the density ρ2 of the adhesive cured on the PET release film by UV irradiation was measured. The curing shrinkage was calculated according to (ρ2-ρ1) ÷ ρ2 × 100%. The structure is shown in Table 3 below.

[0095] Table 3 Curing shrinkage

[0096]

[0097] The following conclusions can be drawn from the test results in Tables 1 to 3 above:

[0098] (1) It can be found from Examples 1 to 4 that the packaging tape prepared by the preparation system constructed by the present invention has good performance in terms of viscosity, curing shrinkage and light transmittance.

[0099] (2) It can be found from Comparative Example 1 that the curing shrinkage of the prepared packaging tape is relatively high. This may be because the introduction of the benzene ring limits the flexibility of the molecular chain, and the free volume of the molecular chain is reduced during the curing process, resulting in a tighter arrangement of the molecular chain during curing, which in turn leads to an increase in the curing shrinkage.

[0100] (3) Comparative Example 2 shows that the light transmittance of the prepared packaging tape is poor. This may be due to the excessively high viscosity, which hinders the uniform leveling of the composite adhesive and increases the surface roughness after curing, resulting in poor light transmittance.

[0101] (4) Comparative Example 3 shows that the light transmittance and viscosity of the prepared packaging tape are poor. This may be because, on the one hand, the methoxy-terminated polydimethylsiloxane does not have an active group hydroxyl group that can directly react with isocyanate, resulting in an inability to react with diisocyanate. On the other hand, the methoxy-terminated polydimethylsiloxane is more hydrophobic than the hydroxyl-terminated polydimethylsiloxane, which may reduce the molecular cohesion, resulting in poor light transmittance and viscosity.

[0102] (5) It can be found from Comparative Example 5 that the curing shrinkage of the prepared packaging tape is relatively high. This may be because hydroxyethyl acrylate has a shorter molecular chain and no steric hindrance group compared to isobornyl methacrylate, and the cross-linking is too tight, which leads to a poor curing rate of the composite adhesive after dilution.

[0103] (6) It can be found from Comparative Example 6 that the adhesiveness of the prepared packaging tape is relatively poor. This may be because after the thickness of the coating is too thick, the curing effect is poor under the curing process of this system, which leads to the poor adhesiveness of the packaging tape obtained after curing.

[0104] The embodiments described above provide a detailed description of the technical solutions and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A method for preparing a polyurethane optical lens packaging tape, characterized in that: The preparation method comprises the following steps: The composite adhesive liquid is scraped onto the substrate, cured by ultraviolet radiation, and then rolled up to obtain a packaging tape; The preparation method of the composite adhesive comprises the following steps: Isocyanate, polydimethylsiloxane, a diol mixture, an organic solvent, and a catalyst are mixed and reacted in a weight ratio of 0.4-0.6:1-1.2:0.2-0.3:1-1.5:0.001-0.003 to obtain a composite liquid; The composite liquid, acrylate and photoinitiator are mixed in a weight ratio of 1:1:0.1-0.2, stirred and degassed to obtain a composite adhesive liquid; The diol mixture is prepared by mixing polycarbonate diol and 1,4-butene diol in a weight ratio of 1:0.1-0.

2.

2. The method for preparing a polyurethane optical lens packaging tape according to claim 1, characterized in that: The isocyanate includes isophorone diisocyanate.

3. The method for preparing a polyurethane optical lens packaging tape according to claim 1, characterized in that: The polydimethylsiloxane includes hydroxyl-terminated polydimethylsiloxane.

4. The method for preparing a polyurethane optical lens packaging tape according to claim 1, characterized in that: The conditions of the mixed reaction include a reaction temperature of 70° C. to 80° C. and a reaction time of 3 h to 4 h.

5. The method for preparing a polyurethane optical lens packaging tape according to claim 1, characterized in that: The acrylic acid ester includes isobornyl acrylate or isobornyl methacrylate.

6. The method for preparing a polyurethane optical lens packaging tape according to claim 1, characterized in that: The substrate includes a PET release film.

7. The method for preparing a polyurethane optical lens packaging tape according to claim 1, characterized in that: The UV curing conditions include a UV wavelength of 365 nm and an irradiation power of 500 mW / cm 2 ~550mW / cm 2 And the irradiation distance is 10cm~15cm.

8. A packaging tape prepared by the method for preparing a polyurethane optical lens packaging tape according to any one of claims 1 to 7.

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