CN113150705B

CN113150705B - Polyurethane lens molding adhesive tape and preparation method thereof

Info

Publication number: CN113150705B
Application number: CN202110553919.3A
Authority: CN
Inventors: 田永军
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-20
Filing date: 2021-05-20
Publication date: 2023-01-17
Anticipated expiration: 2041-05-20
Also published as: CN113150705A

Abstract

The embodiment of the invention relates to a polyurethane lens forming adhesive tape and a preparation method thereof, wherein the polyurethane lens forming adhesive tape comprises the following components: the silicone pressure-sensitive adhesive comprises a polypropylene film layer, a release agent layer, a hardening layer, an organic silicone pressure-sensitive adhesive primer layer and an organic silicone pressure-sensitive adhesive surface adhesive layer; wherein, the release agent layer is on one side of polypropylene film layer, and the sclerosis layer is on the opposite side of polypropylene film layer, and organosilicon pressure sensitive adhesive primer layer is on the sclerosis layer, and organosilicon pressure sensitive adhesive surface glue layer is on organosilicon pressure sensitive adhesive primer layer. The polyurethane lens forming adhesive tape improves the permeability of carbon dioxide generated in the polymerization process of a polyurethane lens monomer, and solves the problem that bubbles exist at the edge of a polyurethane lens.

Description

Polyurethane lens molding adhesive tape and preparation method thereof

Technical Field

The invention relates to the technical field of adhesive tapes, in particular to a polyurethane lens molding adhesive tape and a preparation method thereof.

Background

The traditional middle-low refractive index high-power lens is thicker, the center thickness generally needs to be more than 2.5mm, and the edge thickness needs to be more than 4 mm. The middle-low refractive index high-power lens worn for a long time has certain influence on the eye sockets and the nose bridge development of the school-age teenagers. High refractive index lenses represented by polyurethane monomers are popular with myopia patients due to the characteristics of lightness, thinness, wear resistance, strong impact resistance and the like, and the popularization rate of the high refractive index lenses is continuously improved.

However, the polyurethane lens monomer has high temperature requirements in the polymerization process, the maximum polymerization temperature needs to be higher than 130 ℃, and carbon dioxide gas is generated. The traditional polyurethane lens forming adhesive tape is prepared by coating a polyester film with an organic silicon pressure-sensitive adhesive, and because the polyester film has good barrier property to carbon dioxide, carbon dioxide gas cannot be released through the adhesive tape, and a circle of small bubbles can be formed at the periphery of a lens. Therefore, how to solve the problem of bubbles at the edge of the polyurethane high refractive index lens becomes the key point of research of the industry.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a polyurethane lens forming adhesive tape and a preparation method thereof.

In order to achieve the above object, in a first aspect, the present invention provides a polyurethane lens molding tape comprising: the silicone pressure-sensitive adhesive comprises a polypropylene film layer, a release agent layer, a hardening layer, an organic silicon pressure-sensitive adhesive bottom adhesive layer and an organic silicon pressure-sensitive adhesive surface adhesive layer;

wherein, the release agent layer is in one side of polypropylene film layer, the sclerosis layer is in the opposite side of polypropylene film layer, organosilicon pressure sensitive adhesive primer layer is in on the sclerosis layer, organosilicon pressure sensitive adhesive surface glue layer is in on the organosilicon pressure sensitive adhesive primer layer.

Preferably, the polypropylene film layer comprises a single-layer polypropylene film or a double-layer polypropylene composite film; the double-layer polypropylene composite film comprises two single-layer polypropylene films and a composite adhesive layer positioned between the two single-layer polypropylene films;

the release agent layer comprises acrylic release agent or polyurethane release agent;

the hardening layer comprises one or more of polyurethane, acrylate and epoxy resin;

the organic silicon pressure-sensitive adhesive bottom adhesive layer comprises an organic silicon pressure-sensitive adhesive, a curing agent and a catalyst;

the organic silicon pressure-sensitive adhesive surface adhesive layer comprises an organic silicon pressure-sensitive adhesive, a solvent and a curing agent.

Preferably, the thickness of the polypropylene film layer is 0.02 mm to 0.1 mm;

the thickness of the release agent layer is not more than 1 micron;

the thickness of the hardening layer is 1-5 micrometers;

the thickness of the organic silicon pressure-sensitive adhesive bottom adhesive layer is 0.1 micrometer;

the thickness of the organic silicon pressure-sensitive adhesive surface glue layer is 30 micrometers.

In a second aspect, the present invention provides a method for preparing the polyurethane lens molding tape according to the first aspect, wherein the method comprises:

coating a release agent layer on one surface of the polypropylene film layer; the polypropylene film layer comprises a single-layer polypropylene film or a double-layer polypropylene composite film; the double-layer polypropylene composite film comprises two single-layer polypropylene films and a composite adhesive layer positioned between the two single-layer polypropylene films; the thickness of the polypropylene film layer is 0.02 mm to 0.1 mm; the release agent layer comprises acrylic release agent or polyurethane release agent;

coating a hardening layer on the other surface of the polypropylene film layer; the hardening layer comprises one or more of polyurethane, acrylate and epoxy resin;

coating a 0.1 micron organosilicon pressure-sensitive adhesive primer layer on the surface of the hardened layer; the organic silicon pressure-sensitive adhesive bottom adhesive layer comprises an organic silicon pressure-sensitive adhesive, a curing agent and a catalyst;

coating an organic silicon pressure-sensitive adhesive surface adhesive layer on the surface of the organic silicon pressure-sensitive adhesive bottom adhesive layer; the organic silicon pressure-sensitive adhesive surface adhesive layer comprises an organic silicon pressure-sensitive adhesive, a solvent and a curing agent;

and drying to obtain the polyurethane lens molding adhesive tape.

Preferably, the step of coating a release agent layer on one side of the polypropylene film layer specifically comprises:

coating a release agent layer with the thickness of not more than 1 micron on one surface of the polypropylene film layer at the temperature of 40-50 ℃;

and drying the polypropylene film layer coated with the release agent layer at 130 ℃ for 30 seconds.

Preferably, the step of coating a hardening layer on the other surface of the polypropylene film layer specifically comprises:

under the condition of normal temperature, the polypropylene film layer coated with the release agent layer is put into a coating machine unwinding frame, and a hardening layer of 1-5 micrometers is coated on the other surface of the polypropylene film layer;

and drying the polypropylene film layer coated with the hardening layer for 1 minute at the temperature of 130 ℃.

Preferably, before the silicone pressure-sensitive adhesive surface adhesive is coated on the surface of the silicone pressure-sensitive adhesive base adhesive, the preparation method further comprises the following steps:

and (3) drying the polypropylene film layer coated with the organic silicon pressure-sensitive adhesive primer at the drying temperature of 140 ℃ for 30 seconds.

Preferably, the step of coating the silicone pressure-sensitive adhesive surface glue on the surface of the silicone pressure-sensitive adhesive primer specifically comprises the following steps:

and coating the surface of the organic silicon pressure-sensitive adhesive primer with the thickness of 30 micrometers.

Preferably, the drying temperature is 170 ℃ and the drying time is 1 minute.

According to the polyurethane lens forming adhesive tape provided by the embodiment of the invention, the polypropylene film layer has good carbon dioxide transmission capacity, so that carbon dioxide generated in the polymerization process of the polyurethane lens monomer cannot be gathered at the edge of the lens, the problem of bubbles at the edge of the polyurethane lens is solved, the polypropylene film layer can meet the high-temperature requirement of the polymerization of the polyurethane lens monomer by the hardened layer, and the process temperature requirement of the coating of the organic silicon pressure-sensitive adhesive is met.

Drawings

Fig. 1 is a flowchart of a method for manufacturing a polyurethane lens molding tape according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and process advantages of the present invention more clear, the present invention is described in detail below with reference to the embodiments and the accompanying drawings. Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs, and test reagents used in the following examples are conventional biochemical reagents unless otherwise specified; the test methods are conventional methods unless otherwise specified.

The invention provides a polyurethane lens forming adhesive tape, which comprises: the adhesive comprises a polypropylene film layer, a release agent layer, a hardening layer, an organic silicon pressure-sensitive adhesive bottom adhesive layer and an organic silicon pressure-sensitive adhesive surface adhesive layer.

Wherein, the release agent layer is on one side of polypropylene film layer, and the sclerosis layer is on the opposite side of polypropylene film layer, and organosilicon pressure sensitive adhesive primer layer is on the sclerosis layer, and organosilicon pressure sensitive adhesive surface glue layer is on organosilicon pressure sensitive adhesive primer layer.

The polypropylene film layer may specifically include a single layer polypropylene film or a double layer polypropylene composite film. The double-layer polypropylene composite film comprises two single-layer polypropylene films and a composite adhesive layer positioned between the two single-layer polypropylene films. The polypropylene film is prepared by carrying out high-temperature melting on polypropylene plastic particles, carrying out tape casting or extrusion, and carrying out unidirectional or bidirectional stretching. Has good transparency, no toxicity, no smell and high tensile strength. The deformation temperature of polypropylene films is generally around 110 ℃. The release agent layer may specifically include an acrylic release agent or a polyurethane release agent; the hardened layer may specifically include one or more of polyurethane, acrylate, epoxy; the organosilicon pressure-sensitive adhesive primer layer can specifically comprise an organosilicon pressure-sensitive adhesive, a curing agent and a catalyst; the silicone pressure sensitive adhesive topcoat layer can specifically include a silicone pressure sensitive adhesive, a solvent, and a curing agent. In one particular example, the polypropylene film layer may be particularly 0.02 mm to 0.1 mm thick; the thickness of the release agent layer is not more than 1 micron; the thickness of the hardened layer may specifically be 1 to 5 microns; the thickness of the organic silicon pressure-sensitive adhesive bottom glue layer can be more than 0.1 micrometer, also can be less than 0.1 micrometer, and is preferably 0.1 micrometer; the thickness of the silicone pressure sensitive adhesive topcoat layer may specifically be 30 microns.

In the structure, the polypropylene film layer has good carbon dioxide transmission capacity, so that carbon dioxide generated in the polymerization process of the polyurethane lens monomers cannot be gathered at the edge of the lens, and the problem that bubbles exist at the edge of the polyurethane lens is solved. The polypropylene film layer can meet the high-temperature requirement of polymerization of polyurethane lens monomers by the hardened layer, and simultaneously, the process temperature requirement of organic silicon pressure-sensitive adhesive coating is also met.

Fig. 1 is a flow chart of a method for preparing a polyurethane lens forming adhesive tape according to an embodiment of the present invention, the polyurethane lens forming adhesive tape of the present invention can be obtained by the steps of the preparation method shown in fig. 1, and the following description is provided with reference to fig. 1.

Step 110, coating a release agent layer on one surface of a polypropylene film layer;

specifically, a polypropylene film layer is taken as a base material, and a release agent layer with the thickness of not more than 1 micron is coated on one surface of the polypropylene film layer by using an anilox roller or a micro-concave coating roller at the temperature of 40-50 ℃;

Wherein the polypropylene film layer comprises a single-layer polypropylene film or a double-layer polypropylene composite film; the double-layer polypropylene composite film comprises two single-layer polypropylene films and a composite adhesive layer positioned between the two single-layer polypropylene films; the thickness of the polypropylene film layer is preferably 0.02 mm to 0.1 mm; the release agent layer comprises acrylic release agent or polyurethane release agent.

Step 120, coating a hardening layer on the other surface of the polypropylene film layer;

specifically, the polypropylene film layer coated with the release agent layer is loaded into a unreeling frame of a coating machine under the condition of normal temperature, and a hardening layer of 1-5 micrometers is coated on the other surface of the polypropylene film layer; the hardened layer material used in the step specifically comprises one or more of polyurethane, acrylate and epoxy resin; in practical application, the adhesive can be selected according to the requirements that the adhesive has good adhesive force with the polypropylene film layer and the organic silicon pressure-sensitive adhesive and can resist temperature of more than 130 ℃ in a short period.

Step 130, coating an organic silicon pressure-sensitive adhesive bottom adhesive layer on the surface of the hardening layer;

specifically, the organic silicon pressure-sensitive adhesive primer layer comprises an organic silicon pressure-sensitive adhesive, a curing agent and a catalyst; coating an organic silicon pressure-sensitive adhesive primer layer of 0.1 micrometer on the surface of the hardening layer at normal temperature, and then drying the polypropylene film layer coated with the organic silicon pressure-sensitive adhesive primer at the drying temperature of 140 ℃ for 30 seconds.

Step 140, coating an organic silicon pressure-sensitive adhesive surface adhesive layer on the surface of the organic silicon pressure-sensitive adhesive bottom adhesive layer; the organic silicon pressure-sensitive adhesive surface glue layer comprises organic silicon pressure-sensitive adhesive, solvent and curing agent;

specifically, the surface of the silicone pressure-sensitive adhesive primer is coated with a silicone pressure-sensitive adhesive surface adhesive with the thickness of preferably 30 micrometers.

And 150, drying to obtain the polyurethane lens forming adhesive tape.

Specifically, the drying temperature is 170 ℃, and the time can be 1 minute.

In order to better understand the technical solutions provided by the present invention, the following specific examples respectively illustrate the specific processes for preparing the polyurethane lens forming tape by using the methods provided by the above embodiments of the present invention.

Example 1

The polypropylene film layer selected in this embodiment is a single-layer polypropylene film, and the thickness of the single-layer polypropylene film is 0.05 mm. The method comprises the following specific steps:

1. preparing a release agent solution, wherein the release agent is preferably alkyl urethane modified polyvinyl alcohol, and dissolving powdered alkyl urethane modified polyvinyl alcohol by using ethyl acetate or methylbenzene to prepare the release agent solution with the mass concentration of 5-20%.

2. The release agent solution is coated on the surface of the single-layer polypropylene film by using an anilox roller or a slightly concave coating roller, and the coating thickness is 1 micron. And (3) feeding the single-layer polypropylene film coated with the release agent solution into a drying tunnel, drying for 30 seconds at the temperature of 130 ℃, and judging that the drying standard is smooth surface and no mucus.

3. Loading the single-layer polypropylene film coated with the release agent layer into a coating machine unwinding frame under the condition of normal temperature, coating a hardening layer with the thickness of 1 micron on the other surface of the single-layer polypropylene film, wherein the material of the hardening layer is preferably acrylate, and then drying for 1 minute under the condition of 130 ℃.

4. Preparing an organic silicon pressure-sensitive adhesive primer solution, diluting the organic silicon pressure-sensitive adhesive by 20 times with dimethylbenzene, sequentially adding a curing agent and a catalyst with the mass concentration of 0.5-1% to prepare the organic silicon pressure-sensitive adhesive primer solution with the solid content of 2%, and stirring for more than 30 minutes to fully react.

Among them, the curing agent is preferably

Crosslinker 96A, the catalyst may specifically include catalyst 1 and catalyst 2, with catalyst 1 preferably being SILCOLEASE CATA 62A and catalyst 2 preferably being SILCOLEASE CATA 62B.

5. Coating the prepared organic silicon pressure-sensitive adhesive primer solution on the surface of the hardened layer by using an anilox roller or a micro-concave coating roller, wherein the coating thickness is 0.1 micrometer, and then conveying the cured layer into an oven for drying, wherein the drying temperature is 140 ℃ and the drying time is 30 seconds.

6. And coating the prepared organosilicon pressure-sensitive adhesive surface glue solution on the surface of the dry organosilicon pressure-sensitive adhesive primer, wherein the coating thickness is 30 microns. Wherein the proportion of the organic silicon pressure-sensitive adhesive, the solvent and the curing agent in the organic silicon pressure-sensitive adhesive surface adhesive solution is as follows: 1:0.5:0.02.

7. And (3) drying the coated single-layer polypropylene film in a 170 ℃ oven for 1 minute to obtain the adhesive tape with the thickness of 82.1 micrometers.

This example is a polyurethane lens molding tape obtained by coating a single-layer polypropylene film as a base film. The carbon dioxide gas permeation of the conventional polyester film raw film, the single-layer polypropylene film coated with the hardened layer, the conventional polyester film silica gel tape and the polypropylene film silica gel tape was tested at different temperatures, which indicates the effect of the adhesive tape prepared by using the polypropylene film as the raw film on the carbon dioxide gas permeation of the conventional adhesive tape prepared by using the polyester film as the raw film, and the results are shown in table 1.

TABLE 1

It should be noted that, since the thickness of the hardened layer and the silicone pressure-sensitive adhesive primer in this embodiment is very small and can be ignored, the thickness of the hardened layer and the silicone pressure-sensitive adhesive primer in table 1 is very small and can be ignored, and the thickness of the hardened layer and the silicone pressure-sensitive adhesive primer in table 1 is very small and can be ignored. Therefore, the names of the table only indicate the polypropylene film coated with the hardened layer, the silicone pressure sensitive adhesive primer and the face adhesive and the polypropylene film tape having a thickness of about 80 μm, and do not indicate that the thickness of the hardened film of the polypropylene film is 50 μm and the thickness of the polypropylene film tape having a thickness of 30 μm is 80 μm. According to the result, the carbon dioxide gas permeability of the polypropylene film original film is far greater than that of the polyester film original film under the conditions of equal thickness and different temperature detection, even if a hardening layer is coated, the polypropylene film is adopted as the adhesive tape made of the original film, and the carbon dioxide gas permeability is still far greater than that of the adhesive tape made of the traditional polyester film, so that the polyurethane lens forming adhesive tape made of the polypropylene film original film improves the carbon dioxide gas permeability, the problem that bubbles exist at the edge of the traditional polyurethane lens forming adhesive tape is solved, and the adhesive tape can meet the process temperature requirements of polyurethane lens monomer polymerization and organic silicon pressure-sensitive adhesive coating.

Example 2

The polypropylene film layer selected in this embodiment is a double-layer polypropylene composite film, that is, the polypropylene film layer is formed by compounding two single-layer polypropylene films, wherein the thickness of the single-layer polypropylene film is 0.05 mm. The method comprises the following specific steps:

1. preparing a release agent solution, wherein the release agent is preferably alkyl urethane modified polyvinyl alcohol, and dissolving powdered alkyl urethane modified polyvinyl alcohol by using ethyl acetate or toluene to prepare the release agent solution with the mass concentration of 5-20%.

2. The release agent solution is coated on the surface of the single-layer polypropylene film by using an anilox roller or a slightly concave coating roller, and the coating thickness is 0.5 microns. And (3) feeding the single-layer polypropylene film coated with the release agent solution into a drying tunnel, drying for 30 seconds at the temperature of 130 ℃, and judging that the drying standard is smooth surface and no mucus.

3. And (3) putting the dried single-layer polypropylene film into a coating machine unwinding frame, coating composite glue with the thickness of 5-30 micrometers, preferably 15 micrometers, on the other surface of the single-layer polypropylene film, and drying at 130 ℃ for about 1 minute. And compounding the dried single-layer polypropylene film with another roll of single-layer polypropylene film at the temperature of 60 ℃ to obtain the double-layer polypropylene composite film.

4. And (3) loading the double-layer polypropylene composite film into a coating machine unwinding frame under the normal temperature condition, coating a hardening layer with the thickness of 2 micrometers on the other surface of the double-layer polypropylene composite film, wherein the hardening layer is preferably made of acrylic ester, and then drying for 1 minute at the temperature of 130 ℃.

5. Preparing an organic silicon pressure-sensitive adhesive primer solution, diluting the organic silicon pressure-sensitive adhesive by 20 times with dimethylbenzene, sequentially adding a curing agent with the mass concentration of 0.5-1% and a catalyst to prepare the organic silicon pressure-sensitive adhesive primer solution with the solid content of 2%, and stirring for more than 30 minutes to enable the solution to react fully.

Among them, the curing agent is preferred

Crosslinker 96A, the catalyst may specifically include catalyst 1 and catalyst 2, with catalyst 1 preferably SILCOLEASE CATA 62A and catalyst 2 preferably SILCOLEASE CATA 62B.

6. Coating the prepared organic silicon pressure-sensitive adhesive primer solution on the surface of the hardened layer by using an anilox roller or a micro-concave coating roller, wherein the coating thickness is 0.1 micrometer, and then conveying the cured layer into a primer drying oven for drying, wherein the drying temperature is 140 ℃ and the drying time is 30 seconds.

7. And coating the prepared organosilicon pressure-sensitive adhesive surface glue solution on the surface of the dry organosilicon pressure-sensitive adhesive primer, wherein the coating thickness is 30 microns. Wherein the proportion of the organic silicon pressure-sensitive adhesive, the solvent and the curing agent in the organic silicon pressure-sensitive adhesive surface adhesive solution is as follows: 1:0.5:0.02.

8. And (3) drying the coated polypropylene film in a 170 ℃ oven for 1 minute to obtain the adhesive tape with the thickness of 147.6 microns.

The polypropylene film layer is a double-layer polypropylene composite film selected in the embodiment, and the requirements of different thicknesses of the adhesive tape can be met.

According to the polyurethane lens forming adhesive tape provided by the embodiment of the invention, the polypropylene film layer has good carbon dioxide transmission capacity, so that carbon dioxide generated in the polymerization process of the polyurethane lens monomer cannot be gathered at the edge of the lens, the problem of bubbles at the edge of the polyurethane lens is solved, and the polypropylene film layer can meet the high-temperature requirement of the polymerization of the polyurethane lens monomer and the process temperature requirement of coating the organic silicon pressure-sensitive adhesive.

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A polyurethane lens-forming adhesive tape, comprising: the silicone pressure-sensitive adhesive comprises a polypropylene film layer, a release agent layer, a hardening layer, an organic silicone pressure-sensitive adhesive primer layer and an organic silicone pressure-sensitive adhesive surface adhesive layer;

the release agent layer is arranged on one side of the polypropylene film layer, the hardening layer is arranged on the other side of the polypropylene film layer, the organic silicon pressure-sensitive adhesive bottom glue layer is arranged on the hardening layer, and the organic silicon pressure-sensitive adhesive surface glue layer is arranged on the organic silicon pressure-sensitive adhesive bottom glue layer; wherein the release agent layer comprises an acrylic release agent or a polyurethane release agent; the hardening layer comprises one or more of polyurethane, acrylate and epoxy resin;

wherein the thickness of the polypropylene film layer is 0.02 mm to 0.1 mm;

the thickness of the release agent layer is not more than 1 micron;

the thickness of the hardening layer is 1-5 microns;

2. The polyurethane lens-forming tape of claim 1,

the polypropylene film layer comprises a single-layer polypropylene film or a double-layer polypropylene composite film; the double-layer polypropylene composite film comprises two single-layer polypropylene films and a composite adhesive layer positioned between the two single-layer polypropylene films;

the organic silicon pressure-sensitive adhesive base adhesive layer comprises an organic silicon pressure-sensitive adhesive, a curing agent and a catalyst;

3. A method for preparing the polyurethane lens molding tape according to any one of claims 1 to 2, wherein the method comprises:

coating a 0.1 micron organosilicon pressure-sensitive adhesive primer layer on the surface of the hardened layer; the organic silicon pressure-sensitive adhesive base adhesive layer comprises an organic silicon pressure-sensitive adhesive, a curing agent and a catalyst;

and drying to obtain the polyurethane lens molding adhesive tape.

4. The method of claim 3, wherein coating a release agent layer on one side of the polypropylene film layer specifically comprises:

5. The method according to claim 3, wherein the step of applying a hardening layer on the other surface of the polypropylene film layer specifically comprises:

under the condition of normal temperature, loading the polypropylene film layer coated with the release agent layer into a coating machine unwinding frame, and coating a hardening layer of 1-5 microns on the other surface of the polypropylene film layer;

6. The preparation method according to claim 3, wherein before coating the silicone pressure-sensitive adhesive surface glue on the surface of the silicone pressure-sensitive adhesive primer, the preparation method further comprises:

7. The preparation method according to claim 3, wherein the step of coating the silicone pressure-sensitive adhesive surface glue on the surface of the silicone pressure-sensitive adhesive primer specifically comprises the following steps:

and coating the surface of the organic silicon pressure-sensitive adhesive primer with the thickness of 30 microns with an organic silicon pressure-sensitive adhesive surface adhesive.

8. The method according to claim 3, wherein the drying temperature is 170 ℃ and the drying time is 1 minute.