A blue light-blocking resin lens and its preparation method

Abstract

The present invention relates to the technical field of anti-blue light resin lenses, and discloses an anti-blue light resin lens and a preparation method thereof. By reacting a transition metal oxide with acrylic acid, a complex of the transition metal and acrylic acid is formed, which can protect the transition metal ions from being oxidized, improve the light absorption stability of the transition metal ions in the polyurethane elastomer, and thus ensure the absorption effect on blue light. In addition, during the dispersion process of this complex in the polyurethane elastomer, some carbon-carbon double bonds in the acrylic acid group are broken, and condensation reactions or metathesis condensation reactions occur with ester groups, isocyanate groups, imino groups, hydroxyl groups, etc. in the polyurethane, enabling the transition metal ions to be better and more firmly dispersed in the polyurethane elastomer, and improving the dispersion uniformity and dispersion stability of the transition metal ions in the polyurethane elastomer.

Description

Technical Field

[0001] The present invention relates to the technical field of anti - blue - light resin lenses, and particularly relates to an anti - blue - light resin lens and a preparation method thereof. Background Art

[0002] In today's society, people use electronic devices more and more frequently. These devices, such as smartphones, tablets, computer monitors, etc., will emit blue light. Prolonged exposure to blue light can cause eye fatigue, blurred vision, and even retinal damage, and thus trigger eye diseases such as dry eye syndrome. Therefore, the demand for anti - blue - light lenses is increasing day by day. Most of the existing anti - blue - light resin lenses apply an anti - blue - light coating on the resin matrix or directly add an anti - blue - light agent to the resin matrix.

[0003] For the method of directly adding an anti - blue - light agent to the resin matrix, it is necessary to ensure that the anti - blue - light agent is uniformly dispersed and stably present in the resin matrix. The existing resin - based anti - blue - light lenses are prone to oxidation of the anti - blue - light agent after long - term use, which reduces the function of absorbing blue light, thus reducing the anti - blue - light effect. Therefore, the application and promotion of anti - blue - light lenses doped with anti - blue - light agents are restricted. Summary of the Invention

[0004] Based on the above problems, the present invention provides an anti - blue - light resin lens and a preparation method thereof, which can improve the light absorption stability of transition metal ions in the polyurethane elastomer, thus ensuring the absorption effect of blue light; and can make the transition metal ions better and more firmly dispersed in the polyurethane elastomer, improving the dispersion uniformity and dispersion stability of transition metal ions in the polyurethane elastomer.

[0005] To achieve the above - mentioned technical effects, the technical solution adopted by the present invention is as follows:

[0006] An anti - blue - light resin lens, comprising at least two layers of polycarbonate sheet substrates, an intermediate layer is arranged between adjacent polycarbonate sheet substrates, the intermediate layer is a polyurethane elastomer, a modified blue - light absorber is dispersed in the polyurethane elastomer, the modified blue - light absorber is obtained by modifying a transition metal oxide with blue - light absorption ability with acrylic acid, and the polycarbonate sheet substrate and the polyurethane elastomer are adhesively fixed through a resin adhesive.

[0007] Further, the transition metal oxide with blue - light absorption ability includes one or at least two combinations of nano - alumina, nano - titanium dioxide, nano - cerium oxide or nano - strontium oxide.

[0008] Further, the resin adhesive contains a trivalent iron nano - dispersion.

[0009] To achieve the above technical effects, the present invention also provides a method for preparing a blue light blocking resin lens, including:

[0010] According to the lens structure size, a polycarbonate material with a light transmittance greater than 88% is selected and processed into a polycarbonate sheet substrate.

[0011] A transition metal oxide with blue light absorption ability is added to acrylic acid, and the mixture is stirred until it is transparent or contains flocculates.

[0012] The polyurethane elastomer material is heated to a molten state, and the above mixture is added to the molten liquid. After stirring evenly and cooling, a polyurethane elastomer with a light transmittance greater than 86% is formed and processed into a sheet structure matching the polycarbonate sheet substrate.

[0013] At least two layers of polycarbonate sheet substrates are taken, and at least one layer of the above sheet structure is arranged between adjacent two layers of the polycarbonate sheet substrates, and the sheet structure is adhesively fixed to the corresponding polycarbonate sheet substrate by a resin adhesive.

[0014] Further, the transition metal oxide with blue light absorption ability includes one or a composition of at least two of nano-aluminum oxide, nano-titanium dioxide, nano-cerium oxide or nano-strontium oxide.

[0015] Further, the resin adhesive contains a trivalent iron nano-dispersion.

[0016] Further, the resin adhesive includes an epoxy resin adhesive or an acrylate adhesive.

[0017] Further, during the process of heating the polyurethane elastomer material to a molten state, the heating temperature is 135 - 150 °C.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the reaction of the transition metal oxide with acrylic acid, a complex of the transition metal and acrylic acid is formed, which can protect the transition metal ions from being oxidized, improving the light absorption stability of the transition metal ions in the polyurethane elastomer, thereby ensuring the blue light absorption effect. In addition, during the dispersion process of this complex in the polyurethane elastomer, some carbon-carbon double bonds in the acrylic acid group break, and condensation reactions or double decomposition condensation reactions occur with the ester group, isocyanate group, imino group, hydroxyl group, etc. in the polyurethane, enabling the transition metal ions to be better and more firmly dispersed in the polyurethane elastomer, improving the dispersion uniformity and dispersion stability of the transition metal ions in the polyurethane elastomer. Detailed implementation mode

[0019] To make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to embodiments. The illustrative embodiments and descriptions thereof of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0020] Embodiment 1:

[0021] An anti-blue light resin lens includes at least two layers of polycarbonate sheet substrates. An intermediate layer is provided between adjacent polycarbonate sheet substrates. The intermediate layer is a polyurethane elastomer, and a modified blue light absorber is dispersed in the polyurethane elastomer. The modified blue light absorber is obtained by modifying a transition metal oxide with blue light absorption ability with acrylic acid. The polycarbonate sheet substrate and the polyurethane elastomer are adhesively fixed through a resin adhesive.

[0022] In this embodiment, the blue light absorber selected is a transition metal, which has a good absorption effect on blue light and can effectively reduce the blue light radiation of the LED screen, thereby protecting the human eye. In addition, the transition metal reacts with acrylic acid through the transition metal oxide to form a complex of the transition metal and acrylic acid. Taking aluminum acrylate as an example, three acrylic acid groups are grafted onto the aluminum ion, and the aluminum ion is coated by the acrylic acid groups, which can protect the transition metal ion (aluminum ion) from being oxidized, improving the light absorption stability of the transition metal ion in the polyurethane elastomer, and thus ensuring the absorption effect on blue light. In addition, during the dispersion process of this complex in the polyurethane elastomer, some carbon-carbon double bonds in the acrylic acid groups break and undergo condensation reactions or double decomposition condensation reactions with ester groups, isocyanate groups, imino groups, hydroxyl groups, etc. in the polyurethane, enabling the transition metal ions to be better and more firmly dispersed in the polyurethane elastomer, improving the dispersion uniformity and dispersion stability of the transition metal ions in the polyurethane elastomer.

[0023] In this embodiment, the transition metal oxide with blue light absorption ability can be selected from one or at least two combinations of nano-aluminum oxide, nano-titanium dioxide, nano-cerium oxide or nano-strontium oxide, and has a good absorption effect on blue light. It should be noted that other transition metal oxides that can adsorb blue light are also applicable to the present invention.

[0024] In this embodiment, the resin adhesive contains trivalent iron nano-dispersoids. The trivalent iron nano-dispersoids in the present invention are in trace amounts, which will not only not affect the light transmittance of the blue light-blocking resin lens, but also trivalent iron can be used as a blue light absorber to absorb a small amount of blue light. In addition, the trivalent iron nano-dispersoids in the adhesive can penetrate into the polyurethane elastomer, and the trivalent iron nano-dispersoids act on the carbon-carbon double bonds in the polyurethane elastomer or the acrylic complex, which can further promote the breakage of the remaining part of the carbon-carbon double bonds, so that a better bonding effect can be generated between the polyurethane elastomer and the resin adhesive, further improving the overall stability of the blue light-blocking resin lens.

[0025] Example 2

[0026] A method for preparing a blue light-blocking resin lens includes:

[0027] Step a1: According to the lens structure size, a polycarbonate material with a light transmittance greater than 88% is selected and processed into a polycarbonate sheet substrate;

[0028] Step a2: 0.15 part of nano-aluminum oxide is added to 12 parts of acrylic acid by weight, and the mixture is stirred until the mixture is transparent or contains a small amount of flocs;

[0029] Step a3: 10 parts of polyurethane elastomer material is heated to a molten state, and the heating temperature is 135-150 °C; after the polyurethane elastomer material is melted, 0.2 part of the above mixture is added to the melt, stirred evenly and cooled to form a polyurethane elastomer with a light transmittance greater than 86%, and processed into a sheet structure matching the polycarbonate sheet substrate;

[0030] Step a4: At least two layers of polycarbonate sheet substrates are taken, and at least one layer of the above sheet structure is arranged between adjacent two layers of the polycarbonate sheet substrates, and the sheet structure is adhesively fixed to the corresponding polycarbonate sheet substrate by using a resin adhesive. In this embodiment, the resin adhesive selected is an epoxy resin adhesive or an acrylate adhesive containing trivalent iron nano-dispersoids.

[0031] Preparation of control sample:

[0032] Step b1: A polycarbonate material with a light transmittance greater than 88% is selected and processed into a polycarbonate sheet substrate;

[0033] Step b2: 0.25 part of nano-aluminum oxide is taken by weight for standby;

[0034] Step b3: Take 10 parts of polyurethane elastomer material and heat it to a molten state at a heating temperature of 135 - 150°C. After the polyurethane elastomer material melts, add the 0.25 part of nano-aluminum oxide to the molten liquid, stir evenly and cool to form a polyurethane elastomer with a light transmittance greater than 86%, and process it into a sheet structure matching the polycarbonate sheet substrate;

[0035] Step b4: Take at least two layers of polycarbonate sheet substrates, set at least one layer of the sheet structure between adjacent two layers of the polycarbonate sheet substrates, and use a resin adhesive to bond and fix the sheet structure to the corresponding polycarbonate sheet substrate. In this embodiment, the selected resin adhesive is an epoxy resin adhesive or an acrylate adhesive containing a trivalent iron nano-dispersion.

[0036] Respectively conduct light transmittance tests on the anti-blue light resin lens sample one prepared in the above steps a1 - a4, the polyurethane elastomer material doped with the mixed liquid in step a3 as sample two, and the anti-blue light resin lens control sample prepared in steps b1 - b4. The representative wavelengths of the test light sources are 450 nm and 600 nm respectively, and the transmittances of each sample to different light sources are shown in Table 1 below:

[0037] Table 1 Data table of transmittance of test samples under light sources with different representative wavelengths

[0038]

[0039] As can be seen from the data in Table 1 above, the light transmittances of the three samples to visible light with a representative wavelength of 600 nm are all above 85%. However, for the blue light with a representative wavelength of 450 nm, only the transmittance of sample two in which a small amount of transition metal oxide and acrylic acid are added to the polyurethane elastomer to form a complex of transition metal and acrylic acid is less than 1%, meeting the protection requirements for blue light. In addition, due to the role of the trivalent iron nano-dispersion in the adhesive, sample one has the best protection effect against blue light. And the anti-blue light resin lens (i.e., the control sample) that only adds nano-aluminum oxide has a good protection effect against blue light, but the transmittance exceeds 1%, which is not the best effect.

[0040] In this embodiment, a light source with a representative wavelength of 450 nm is used to conduct light transmittance tests on different parts of the anti-blue light resin lens of sample one, and the transmittance data of each measurement point are shown in Table 2 below:

[0041] Table 2 Data table of transmittance of test samples at different parts under a light source with a representative wavelength of 450 nm

[0042]

[0043] The data shows that the modified blue light absorber has good dispersion in the anti-blue light resin lens.

[0044] The above is the embodiment of the present invention. The above embodiments and the specific parameters in the embodiments are only for clearly expressing the invention verification process, and are not used to limit the patent protection scope of the present invention. The patent protection scope of the present invention still takes its claims as the criterion. All equivalent structural changes made by using the content of the specification of the present invention should also be included in the protection scope of the present invention by the same token.

Claims

1. A blue light blocking resin lens, characterized in that, It includes at least two layers of polycarbonate sheet substrates, with an intermediate layer disposed between adjacent polycarbonate sheet substrates. The intermediate layer is a polyurethane elastomer, and a modified blue light absorber is dispersed in the polyurethane elastomer. The modified blue light absorber is obtained by modifying a transition metal oxide with blue light absorption ability with acrylic acid. The polycarbonate sheet substrate and the polyurethane elastomer are adhesively fixed through a resin adhesive, and a trivalent iron nano-dispersion is included in the resin adhesive. The preparation method of the modified blue light absorber is to add a transition metal oxide with blue light absorption ability to acrylic acid and stir until the mixture is transparent or contains floccules.

2. The anti-blue light resin lens according to claim 1, wherein: The transition metal oxide with blue light absorption ability includes a composition of one or both of nano-titanium dioxide and nano-cerium oxide.

3. A preparation method of a blue-light blocking resin lens, characterized in that, It includes: According to the lens structure size, select a polycarbonate material with a light transmittance greater than 88% and process it into a polycarbonate sheet substrate. Add a transition metal oxide with blue light absorption ability to acrylic acid and stir until the mixture is transparent or contains floccules. Heat the polyurethane elastomer material to a molten state, add the mixture to the molten liquid, stir evenly and cool to form a polyurethane elastomer with a light transmittance greater than 86%, and process it into a sheet structure matching the polycarbonate sheet substrate. Take at least two layers of polycarbonate sheet substrates, dispose at least one layer of the sheet structure between adjacent two layers of polycarbonate sheet substrates, and adhesively fix the sheet structure and the corresponding polycarbonate sheet substrate with a resin adhesive. A trivalent iron nano-dispersion is included in the resin adhesive.

4. The preparation method of the blue light blocking resin lens according to claim 3, characterized in that: The transition metal oxide with blue light absorption ability includes a composition of one or both of nano-titanium dioxide and nano-cerium oxide.

5. The preparation method of the blue light blocking resin lens according to claim 3, characterized in that: The resin adhesive includes an epoxy resin adhesive or an acrylate adhesive.

6. The preparation method of the blue light blocking resin lens according to claim 3, characterized in that: During the process of heating the polyurethane elastomer material to a molten state, the heating temperature is 135 - 150 °C.

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