Colored pearlescent silicon hydrogel contact lens and preparation method thereof

Abstract

The invention provides a colored pearlescent silicon hydrogel contact lens and a preparation method thereof, and belongs to the technical field of contact lens materials. The colored pearly-luster silicon hydrogel contact lens comprises an inner film coating layer, a pearly-luster layer and a lens layer. The preparation method of the contact lens comprises the following steps: mixing raw materials of the inner covering film layer, and performing light curing to obtain the inner covering film layer; mixing raw materials of the pearly-luster layer, and performing thermocuring to obtain the pearly-luster layer; lens layer raw materials are mixed and then subjected to illumination curing to obtain a lens layer; and placing the demolded contact lens in 0.9% normal saline for replacement for 0.5-1 h to obtain the colored pearly-luster silicon hydrogel contact lens. The contact lens is high in oxygen permeation rate, constant in water content and comfortable to wear.

Description

Technical Field

[0001] The invention relates to the technical field of contact lens materials, and in particular to a colored pearlescent silicone hydrogel contact lens and a preparation method thereof. Background Art

[0002] Colored contact lenses can not only correct vision, but also have a variety of colors and can beautify the pupil, so they are popular among people. However, colored contact lenses have a certain risk of fading. Wearing colored contact lenses that are easy to fade can cause corneal infection, and in severe cases, blindness. When early colored contact lenses were made, they were generally based on ordinary colorless contact lenses, with a layer of color printed directly on the iris area on the surface of the lens. If the color layer of such contact lenses falls off during future wear, it will affect eye health and pose a great risk. Therefore, in order to enable wearers to wear colored contact lenses more safely, people have tried to improve previous dyeing technology.

[0003] The existing manufacturing process sandwiches the color layer between two layers of lens main materials (commonly known as the sandwich process), eliminating the risk of fading after wearing. However, due to the particularity of the process, the thickness of the colored contact lenses produced by the sandwich process inevitably increases, which reduces the comfort when wearing, and has poor oxygen permeability and difficult to control water content.

[0004] Chinese patent number CN109188715A discloses a method for directly using bare wafers to prepare sandwich colored contact lenses. Although the surface layer solves the surface flatness of the pattern layer and prevents discoloration and prevents direct contact between the pigment layer and the eyelid or eyeball, it greatly simplifies the current method of using a molding process or a rotating process to prepare sandwich colored contact lenses. The process is simple and flexible, but it does not have a sterilization function. Consumers who use this product for a long time greatly increase the probability of keratitis. At the same time, the oxygen permeability is poor, and the comfort of wearing the contact lenses cannot be increased, which brings about the problem of defects in the preparation method.

[0005] Therefore, how to obtain a method for preparing colored contact lenses that are comfortable to wear, reduce the probability of corneal disease and have simple process is a technical problem that needs to be solved at present. Summary of the invention

[0006] The purpose of the present invention is to provide a colored pearlescent silicone hydrogel contact lens and a preparation method thereof, so as to solve the technical problems of existing contact lenses, such as low wearing comfort, susceptibility to keratitis and complex process.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] The present invention provides a colored pearlescent silicone hydrogel contact lens, comprising an inner coating layer, a pearlescent layer and a lens layer;

[0009] The inner coating layer is prepared from the following raw materials in parts by weight:

[0010] Contains 10-50 parts of siloxane polymerization monomer, 10-30 parts of hydrophilic monomer, 0.01-0.2 parts of photoinitiator, 0.1-2 parts of crosslinking agent, 50-80 parts of n-butanol, and 1-20 parts of polyethylene glycol;

[0011] The pearlescent layer is prepared from the following raw materials in parts by weight:

[0012] 5-10 parts of pigment, 20-30 parts of hydroxypropyl acrylate, 10-50 parts of siloxane-containing polymerizable monomer, 0.01-0.2 parts of thermal initiator, 0.1-2 parts of crosslinking agent;

[0013] The lens layer is prepared from raw materials comprising the following mass fractions:

[0014] It contains 50-70 parts of siloxane polymerization monomer, 20-40 parts of tetraethylene glycol diacrylate, 1-3 parts of ultraviolet absorber, 0.01-2 parts of photoinitiator and 50-80 parts of ethylene glycol monoethyl ether.

[0015] Furthermore, the siloxane-containing monomers independently include at least two of methacryloxypropyl tris(trimethylsiloxy)silane, vinyl triethoxysilane, and 4-methacryloxybutyl-terminated polydimethylsiloxane.

[0016] Further, the hydrophilic monomer is a mixture of 2-hydroxyethyl methacrylate and methyl methacrylate;

[0017] The molar ratio of the 2-hydroxyethyl methacrylate to the methyl methacrylate is 1:1-3.

[0018] Further, the photoinitiator independently comprises (2,4,6-trimethylbenzoyl)diphenylphosphine oxide and / or phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide;

[0019] The thermal initiator comprises azobisisobutyronitrile;

[0020] The cross-linking agent independently comprises polyethylene glycol diacrylate and / or polyethylene glycol dimethacrylate.

[0021] Furthermore, the ultraviolet absorber comprises 2-(2'-hydroxy-5'-methylphenyl)benzotriazole and / or 2-(4-benzoyl-3-hydroxyphenoxy)ethyl 2-acrylate.

[0022] Furthermore, the pigment comprises one or more of iron dioxide oxide, aluminum oxide, carbazole violet and titanium dioxide.

[0023] The present invention also provides a method for preparing a colored pearlescent silicone hydrogel contact lens, comprising the following steps:

[0024] (1) mixing a siloxane-containing polymer monomer, a hydrophilic monomer, a photoinitiator, a crosslinking agent, n-butanol and polyethylene glycol to obtain a mixed solution, mixing the mixed solution with a curing agent, and then pouring the mixed solution into a positive mold and curing it under light to obtain an inner coating layer;

[0025] (2) mixing a silicone-containing polymer monomer, hydroxypropyl acrylate, a pigment, a thermal initiator and a crosslinking agent to obtain ink, mixing the ink and a curing agent, and transferring the mixture to the inner coating layer for thermal curing to obtain a pearlescent layer;

[0026] (3) mixing a siloxane-containing polymer monomer, tetraethylene glycol diacrylate, a UV absorber, ethylene glycol monoethyl ether and a photoinitiator and transferring the mixture to a negative mold for light curing to obtain a lens layer;

[0027] (4) After demolding the mold, place it in 0.9% physiological saline for replacement for 0.5 to 1 hour to obtain a colored pearlescent silicone hydrogel contact lens.

[0028] Furthermore, in the steps (1) and (3), the wavelength of the light for light curing is 320 to 420 nm, the light intensity is 95 to 98%, and the light curing time is 5 to 30 min.

[0029] Further, the curing agent independently comprises one or more of hexamethylene diisocyanate, polyhexamethylene diisocyanate, 2,4-toluene diisocyanate, poly-2,4-toluene diisocyanate, bis(isocyanate phenyl)methane and diepoxide;

[0030] The mass ratio of the curing agent to the mixed liquid is 0.2-0.5:100, and the mass ratio of the curing agent to the ink is 0.2-0.5:100.

[0031] Furthermore, the thermal curing temperature is 100-150° C., and the thermal curing time is 1-3 hours.

[0032] Beneficial effects of the present invention:

[0033] The present invention adopts a "sandwich" process method, thereby avoiding the risk of long-term fading and keratitis of colored contact lenses prepared by traditional process methods; the present invention adds n-butanol and polyethylene glycol to the inner coating layer, and through the interaction of hydroxyl-containing compounds, the water content of the contact lenses is increased, and the wearing comfort is enhanced; and due to the mutual cross-linking effect of the two hydrophilic monomers, the oxygen permeability of the contact lenses is increased, and the comfort is increased.

[0034] The colored contact lenses of the present invention also have the effect of resisting ultraviolet rays, and there is no glare when worn in the sun. They can resist 80% of ultraviolet rays, thereby increasing the user experience. DETAILED DESCRIPTION

[0035] The present invention provides a colored pearlescent silicone hydrogel contact lens, comprising an inner coating layer, a pearlescent layer and a lens layer;

[0036] The inner coating layer is prepared from the following raw materials in parts by weight:

[0037] Contains 10-50 parts of siloxane polymerization monomer, 10-30 parts of hydrophilic monomer, 0.01-0.2 parts of photoinitiator, 0.1-2 parts of crosslinking agent, 50-80 parts of n-butanol, and 1-20 parts of polyethylene glycol;

[0038] The pearlescent layer is prepared from the following raw materials in parts by weight:

[0039] 5-10 parts of pigment, 20-30 parts of hydroxypropyl acrylate, 10-50 parts of siloxane-containing polymerizable monomer, 0.01-0.2 parts of thermal initiator, 0.1-2 parts of crosslinking agent;

[0040] The lens layer is prepared from raw materials comprising the following mass fractions:

[0041] It contains 50-70 parts of siloxane polymerization monomer, 20-40 parts of tetraethylene glycol diacrylate, 1-3 parts of ultraviolet absorber, 0.01-2 parts of photoinitiator and 50-80 parts of ethylene glycol monoethyl ether.

[0042] In the present invention, in the raw materials for preparing the inner film layer, the content of the siloxane-containing polymerized monomer is preferably 20 to 40 parts by weight, more preferably 25 to 35 parts, and even more preferably 30 parts.

[0043] In the present invention, in the raw materials for preparing the inner film layer, the content of the hydrophilic monomer is preferably 15 to 25 parts by mass, and more preferably 20 parts by mass.

[0044] In the present invention, in the raw materials for preparing the inner film layer, the content of the photoinitiator is preferably 0.05 to 0.15 parts by mass, and more preferably 0.08 to 0.12 parts by mass.

[0045] In the present invention, in the raw materials for preparing the inner film layer, the content of the cross-linking agent is preferably 0.5 to 1.5 parts by mass, and more preferably 0.8 to 1.2 parts by mass.

[0046] In the present invention, in the raw materials for preparing the inner film layer, the content of n-butanol is preferably 60 to 70 parts by mass, and more preferably 65 parts by mass.

[0047] In the present invention, in the raw materials for preparing the inner film layer, the content of the polyethylene glycol is preferably 5 to 15 parts by weight, and more preferably 10 parts by weight.

[0048] In the present invention, the content of the pigment in the raw materials for preparing the pearlescent layer is preferably 6 to 9 parts by mass, and more preferably 7 to 8 parts by mass.

[0049] In the present invention, in the raw materials for preparing the pearlescent layer, the content of hydroxypropyl acrylate is preferably 22 to 28 parts by mass, and more preferably 25 parts by mass.

[0050] In the present invention, in the raw materials for preparing the pearlescent layer, the content of the siloxane-containing polymerized monomer is preferably 20 to 40 parts by mass, more preferably 25 to 35 parts, and even more preferably 30 parts.

[0051] In the present invention, in the raw materials for preparing the pearlescent layer, the content of the thermal initiator is preferably 0.05 to 0.15 parts by mass, and more preferably 0.08 to 0.12 parts by mass.

[0052] In the present invention, in the raw materials for preparing the pearlescent layer, the content of the crosslinking agent is preferably 0.5 to 1.5 parts by mass, and more preferably 0.8 to 1.2 parts by mass.

[0053] In the present invention, in the raw materials for preparing the lens layer, the content of the siloxane-containing polymerized monomer is preferably 55 to 65 parts by mass, and more preferably 60 parts by mass.

[0054] In the present invention, in the raw materials for preparing the lens layer, the content of tetraethylene glycol diacrylate is preferably 25 to 35 parts by weight, and more preferably 30 parts by weight.

[0055] In the present invention, in the raw materials for preparing the lens layer, the content of the ultraviolet absorber is preferably 1.5 to 2.5 parts by weight, and more preferably 2 parts by weight.

[0056] In the present invention, in the raw materials for preparing the lens layer, the content of the photoinitiator is preferably 0.5 to 1.5 parts by mass, and more preferably 1.0 part.

[0057] In the present invention, in the raw materials for preparing the lens layer, the content of ethylene glycol monoethyl ether is preferably 55 to 75 parts by mass, and more preferably 60 to 70 parts by mass.

[0058] In the present invention, if the content of the crosslinking agent is greater than 2 parts by mass, the optical field of view, flexibility, and water content of the colored contact lens may be affected.

[0059] In the present invention, if the content of the initiator is greater than 1 part by mass, the optical field of view, flexibility, and water content of the colored contact lens may be affected.

[0060] In the present invention, the siloxane-containing monomer independently comprises at least two of methacryloxypropyl tris(trimethylsiloxane)silane, vinyl triethoxysilane, and 4-methacryloxybutyl-terminated polydimethylsiloxane, preferably a mixture of methacryloxypropyl tris(trimethylsiloxane)silane and vinyl triethoxysilane, and the molar ratio of methacryloxypropyl tris(trimethylsiloxane)silane to vinyl triethoxysilane is preferably 1 to 3:3 to 5, and more preferably 2:4.

[0061] In the present invention, the hydrophilic monomer is a mixture of 2-hydroxyethyl methacrylate and methyl methacrylate;

[0062] The molar ratio of the 2-hydroxyethyl methacrylate to methyl methacrylate is 1:1 to 3, preferably 1:2.

[0063] In the present invention, the photoinitiator independently comprises (2,4,6-trimethylbenzoyl)diphenylphosphine oxide and / or phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, preferably (2,4,6-trimethylbenzoyl)diphenylphosphine oxide;

[0064] The thermal initiator is preferably azobisisobutyronitrile;

[0065] The cross-linking agent independently comprises polyethylene glycol diacrylate and / or polyethylene glycol dimethacrylate, preferably polyethylene glycol diacrylate.

[0066] In the present invention, the ultraviolet absorber comprises 2-(2'-hydroxy-5'-methylphenyl)benzotriazole and / or 2-(4-benzoyl-3-hydroxyphenoxy)ethyl 2-acrylate, preferably 2-(2'-hydroxy-5'-methylphenyl)benzotriazole.

[0067] In the present invention, the pigment is preferably one or more of iron dioxide oxide, aluminum oxide, carbazole violet and titanium dioxide.

[0068] The present invention also provides a method for preparing a colored pearlescent silicone hydrogel contact lens, comprising the following steps:

[0069] (1) mixing a siloxane-containing polymer monomer, a hydrophilic monomer, a photoinitiator, a crosslinking agent, n-butanol and polyethylene glycol to obtain a mixed solution, mixing the mixed solution with a curing agent, and then pouring the mixed solution into a positive mold and curing it under light to obtain an inner coating layer;

[0070] (2) mixing a silicone-containing polymer monomer, hydroxypropyl acrylate, a pigment, a thermal initiator and a crosslinking agent to obtain ink, mixing the ink and a curing agent, and transferring the mixture to the inner coating layer for thermal curing to obtain a pearlescent layer;

[0071] (3) mixing a siloxane-containing polymer monomer, tetraethylene glycol diacrylate, a UV absorber, ethylene glycol monoethyl ether and a photoinitiator and transferring the mixture to a negative mold for light curing to obtain a lens layer;

[0072] (4) After demolding the mold, place it in 0.9% physiological saline for replacement for 0.5 to 1 hour to obtain a colored pearlescent silicone hydrogel contact lens.

[0073] In the present invention, in the steps (1) and (3), the wavelength of the light for photocuring is 320-420 nm, the light intensity is 95-98%, preferably 97%; and the time for photocuring is 5-30 min, preferably 20 min.

[0074] In the present invention, the light curing is preferably UV light curing.

[0075] In the present invention, the curing agent independently comprises one or more of hexamethylene diisocyanate, polyhexamethylene diisocyanate, 2,4-toluene diisocyanate, poly-2,4-toluene diisocyanate, bis(isocyanate phenyl)methane and diepoxide, preferably one or more of hexamethylene diisocyanate, polyhexamethylene diisocyanate and 2,4-toluene diisocyanate.

[0076] In the present invention, the mass ratio of the curing agent to the mixed liquid is 0.2 to 0.5:100, preferably 0.3 to 0.4:100; the mass ratio of the curing agent to the ink is 0.2 to 0.5:100, preferably 0.3 to 0.4:100.

[0077] In the present invention, the temperature of the thermal curing is 100 to 150° C., preferably 110 to 140° C., and more preferably 120 to 130° C.; the time of the thermal curing is 1 to 3 hours, and preferably 2 hours.

[0078] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0079] Example 1

[0080] (1) Preparation of inner coating layer:

[0081] 30 parts of methacryloxypropyl tris(trimethylsiloxy)silane and vinyl triethoxysilane in a molar ratio of 1:3, 15 parts of a mixture of 2-hydroxyethyl methacrylate and methyl methacrylate in a molar ratio of 1:2, 0.2 parts of (2,4,6-trimethylbenzoyl) diphenylphosphine oxide, 1.5 parts of polyethylene glycol diacrylate, 58 parts of n-butanol and 18 parts of polyethylene glycol are mixed to obtain a mixed solution, the mixed solution is mixed with 0.4 parts of 2,4-toluene diisocyanate curing agent, and then poured into a positive mold and cured for 20 minutes by UV light with a wavelength of 350 nm and a light intensity of 97%, to obtain an inner coating layer;

[0082] (2) Preparation of pearlescent layer:

[0083] 45 parts of methacryloxypropyl tris(trimethylsiloxy)silane and vinyl triethoxysilane in a molar ratio of 1:2, 22 parts of hydroxypropyl acrylate, 10 parts of pigment, 0.2 parts of azobisisobutyronitrile and 0.5 parts of polyethylene glycol dimethacrylate are mixed to obtain ink, the ink is mixed with 0.3 parts of hexamethylene diisocyanate curing agent and then transferred to the inner coating layer and heat cured at 120° C. for 3 hours to obtain a pearlescent layer; the pigment can be selected from one or more of iron dioxide oxide, aluminum oxide, carbazole violet and titanium dioxide;

[0084] (3) Preparation of lens layer:

[0085] 69 parts of methacryloxypropyl tris(trimethylsiloxy)silane and vinyl triethoxysilane in a molar ratio of 1:4, 35 parts of tetraethylene glycol diacrylate, 2 parts of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 55 parts of ethylene glycol monoethyl ether and 0.5 parts of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide were mixed and transferred to a negative mold and cured for 30 minutes under UV light with a wavelength of 350 nm and a light intensity of 97% to obtain a lens layer;

[0086] (4) After demolding the mold, the mold is placed in 0.9% physiological saline for replacement for 1 hour to obtain a colored pearlescent silicone hydrogel contact lens.

[0087] Example 2

[0088] The same as Example 1, except that, in the preparation of the inner coating layer, 35 parts of vinyl triethoxysilane and 4-methacryloxybutyl terminated polydimethylsiloxane in a molar ratio of 1:3 are used.

[0089] Example 3

[0090] The same as Example 1, except that, in the preparation of the pearlescent layer, 45 parts of vinyl triethoxysilane and 4-methacryloxybutyl terminated polydimethylsiloxane in a molar ratio of 1:4 are used.

[0091] Example 4

[0092] The same as Example 1, except that in the preparation of the inner coating layer, the hydrophilic monomer used is a mixture of 2-hydroxyethyl methacrylate and methyl methacrylate in a molar ratio of 1:3.

[0093] Example 5

[0094] Same as Example 1, except that, in the preparation of the lens layer, the content of tetraethylene glycol diacrylate is 20 parts.

[0095] Comparative Example 1

[0096] The same as Example 1, except that in the preparation of the inner coating layer, the siloxane-containing polymerizable monomer is vinyltriethoxysilane.

[0097] Comparative Example 2

[0098] The same as Example 1, except that in the preparation of the inner coating layer, the hydrophilic monomer is 2-hydroxyethyl methacrylate.

[0099] Comparative Example 3

[0100] The same as Example 1, except that polyethylene glycol is not added in the preparation of the inner coating layer.

[0101] The colored pearlescent silicone hydrogel contact lenses obtained in Examples 1 to 5 and Comparative Example 3 were tested, and the test results are shown in Table 1:

[0102] Table 1 Test results

[0103]

[0104]

[0105] Among them, D k The unit is 10 -11 (cm 2 / s)[mLO 2 / (mL.mmHg)].

[0106] As can be seen from Table 1, the oxygen permeability of the colored pearlescent silicone hydrogel contact lens prepared by the present invention can reach 160D k The moisture content reaches more than 55%, which improves the wearing comfort. The pearlescent layer of the present invention has high color fastness and will not fade after long-term wearing.

[0107] It can be seen from the above embodiments that the present invention provides a colored pearlescent silicone hydrogel contact lens and a preparation method thereof. The present invention adds n-butanol and polyethylene glycol to the inner coating layer, and through the interaction of hydroxyl-containing compounds, the water content of the contact lens is increased, and the wearing comfort is enhanced; and due to the mutual cross-linking of the two hydrophilic monomers, the oxygen permeability of the contact lens is increased, and the comfort is increased. The colored contact lens of the present invention also has the effect of anti-ultraviolet rays, and there will be no glare when worn in the sun. It can resist 80% of ultraviolet rays, which increases the user experience.

[0108] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A colored pearlescent silicone hydrogel contact lens, characterized in that: It includes an inner coating layer, a pearlescent layer and a lens layer; The inner coating layer is prepared from the following raw materials in parts by weight: Contains 10-50 parts of siloxane polymerization monomer, 10-30 parts of hydrophilic monomer, 0.01-0.2 parts of photoinitiator, 0.1-2 parts of crosslinking agent, 50-80 parts of n-butanol, and 1-20 parts of polyethylene glycol; The pearlescent layer is prepared from the following raw materials in parts by weight: 5-10 parts of pigment, 20-30 parts of hydroxypropyl acrylate, 10-50 parts of siloxane-containing polymerizable monomer, 0.01-0.2 parts of thermal initiator, 0.1-2 parts of crosslinking agent; The lens layer is prepared from raw materials comprising the following mass fractions: It contains 50-70 parts of siloxane polymerization monomer, 20-40 parts of tetraethylene glycol diacrylate, 1-3 parts of ultraviolet absorber, 0.01-2 parts of photoinitiator and 50-80 parts of ethylene glycol monoethyl ether.

2. The colored pearlescent silicone hydrogel contact lens according to claim 1, characterized in that: The siloxane-containing monomers independently include at least two of methacryloxypropyl tris(trimethylsiloxy)silane, vinyl triethoxysilane, and 4-methacryloxybutyl-terminated polydimethylsiloxane.

3. The colored pearlescent silicone hydrogel contact lens according to claim 1 or 2, characterized in that: The hydrophilic monomer is a mixture of 2-hydroxyethyl methacrylate and methyl methacrylate; The molar ratio of the 2-hydroxyethyl methacrylate to the methyl methacrylate is 1:1-3.

4. The colored pearlescent silicone hydrogel contact lens according to claim 3, characterized in that: The photoinitiator independently comprises (2,4,6-trimethylbenzoyl)diphenylphosphine oxide and / or phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide; The thermal initiator comprises azobisisobutyronitrile; The cross-linking agent independently comprises polyethylene glycol diacrylate and / or polyethylene glycol dimethacrylate.

5. The colored pearlescent silicone hydrogel contact lens according to claim 1, 2 or 4, characterized in that: The ultraviolet absorber comprises 2-(2'-hydroxy-5'-methylphenyl)benzotriazole and / or 2-(4-benzoyl-3-hydroxyphenoxy)ethyl 2-acrylate.

6. The colored pearlescent silicone hydrogel contact lens according to claim 1, characterized in that: The pigment comprises one or more of iron dioxide oxide, aluminum oxide, carbazole violet and titanium dioxide.

7. The method for preparing the colored pearlescent silicone hydrogel contact lens according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) mixing a siloxane-containing polymer monomer, a hydrophilic monomer, a photoinitiator, a crosslinking agent, n-butanol and polyethylene glycol to obtain a mixed solution, mixing the mixed solution with a curing agent, and then pouring the mixed solution into a positive mold and curing it under light to obtain an inner coating layer; (2) mixing a silicone-containing polymer monomer, hydroxypropyl acrylate, a pigment, a thermal initiator and a crosslinking agent to obtain ink, mixing the ink with a curing agent and transferring the mixture to the inner coating layer for thermal curing to obtain a pearlescent layer; (3) mixing a siloxane-containing polymer monomer, tetraethylene glycol diacrylate, a UV absorber, ethylene glycol monoethyl ether and a photoinitiator and transferring the mixture to a negative mold for light curing to obtain a lens layer; (4) After demolding the mold, place it in 0.9% physiological saline for replacement for 0.5 to 1 hour to obtain a colored pearlescent silicone hydrogel contact lens.

8. The method for preparing colored pearlescent silicone hydrogel contact lenses according to claim 7, characterized in that: In the steps (1) and (3), the wavelength of the light for light curing is 320-420 nm, the light intensity is 95-98%, and the light curing time is 5-30 min.

9. The method for preparing colored pearlescent silicone hydrogel contact lenses according to claim 7 or 8, characterized in that: The curing agent independently comprises one or more of hexamethylene diisocyanate, polyhexamethylene diisocyanate, 2,4-toluene diisocyanate, poly-2,4-toluene diisocyanate, bis(isocyanate phenyl)methane and diepoxide; The mass ratio of the curing agent to the mixed liquid is 0.2-0.5:100, and the mass ratio of the curing agent to the ink is 0.2-0.5:

100.

10. The method for preparing colored pearlescent silicone hydrogel contact lenses according to claim 9, characterized in that: The temperature of the thermal curing is 100-150° C., and the time of the thermal curing is 1-3 hours.

Images