Low-refractive blue-light-proof resin lens and preparation method thereof

Abstract

The present invention discloses a low-refractive blue light-proof resin lens and a preparation method thereof. The lens comprises the following components in a weight ratio: resin monomer: blue light absorber: polymerization initiator = 100: 0.5-2.5: 0.5-3, wherein the resin monomer is a trifunctional allyl carbonate monomer. The present invention introduces a new trifunctional allyl carbonate monomer for blue light-proof resin lenses, and matches the initiator and the blue light absorber, as well as a one-time curing molding process and an annealing process, to prepare a low-refractive blue light-proof resin lens with a refractive index of 1.50 and an Abbe coefficient of 55±5%. The formula can not only improve the blue light absorption rate but also ensure the quality of the lens, improve the yield rate, and the production raw materials do not need to be imported, which greatly saves production costs and efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of resin lenses, and more specifically, relates to a low-refractive blue light-proof resin lens and a preparation method thereof. Background Art

[0002] Among visible light, blue light is a high-energy short-wave light. Blue light can easily penetrate the lens of the eye and reach the retina, causing photochemical damage to the eye, rapidly accelerating the oxidation process in the macular area of ​​the eye and causing great damage to the eye, leading to symptoms such as dry eyes, sore eyes, and eye pain. It can also cause fundus damage after cataract surgery. Blue light can inhibit the secretion of melatonin, disturb sleep, and increase the incidence of major diseases. With the progress of society and the development of science and technology, people's living standards are getting higher and higher. In order to solve the above problems at the same time, many people choose to wear glasses with blue light protection.

[0003] Resin lenses are made of organic materials. The inside is a polymer chain structure, which is connected to form a three-dimensional network structure. The intermolecular structure is relatively loose, and there is space between the molecular chains for relative displacement. The light transmittance is 84%-90%, with good light transmittance. At the same time, optical resin lenses have strong impact resistance. CR-39 was used to produce eye correction lenses from 1955 to 1960. It is the first generation of ultra-light and impact-resistant resin lenses. As a thermosetting material, CR-39 monomers are in liquid state and polymerize and cure under heating and the addition of catalysts. Polymerization is a chemical reaction, that is, a new polymer molecule composed of several monomers with the same molecular structure has different lengths and properties. As an optical lens, the parameters of CR-39 material properties are very suitable: refractive index 1.5 (close to ordinary glass lenses), specific gravity 1.32 (almost half of glass), Abbe number 58-59 (only a little dispersion), impact resistance, high light transmittance, and can be dyed and coated. At present, CR39 resin lenses are still the most widely used in Europe, the United States and other countries. Therefore, most of the CR39 monomers used in China are imported from Europe, the United States and other countries, and there are almost no Chinese raw materials for the development of CR39 monomers for anti-blue light lenses. Summary of the invention

[0004] The purpose of the present invention is to address the above shortcomings and provide a low-refractive blue-light-proof resin lens and a preparation method thereof, introduce a new resin raw material, and match it with an initiator and a blue light absorber, as well as a one-time curing molding process and an annealing process, to prepare a blue-light-proof resin lens with a low refractive index of 1.50 and a high Abbe coefficient.

[0005] To achieve the above object, the present invention is implemented by the following technical solutions:

[0006] A low-refractive blue light-proof resin lens comprises the following components in a weight ratio: resin monomer: blue light absorber: polymerization initiator = 100: 0.5-2.5: 0.5-3, wherein the resin monomer is a trifunctional allyl carbonate monomer.

[0007] Preferably, the lens comprises the following components in a weight ratio: resin monomer: blue light absorber: polymerization initiator = 100: 1-1.8: 1.0-2.0.

[0008] The refractive index n of the lens of the present invention is e It is 1.501±0.003, and the Abbe coefficient is 55±5%.

[0009] Preferably, the chemical structural formula of the trifunctional allyl carbonate monomer of the present invention is:

[0010]

[0011] Preferably, the blue light absorber of the present invention is a benzophenone absorber, which is any one or more of 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octyloxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone or 2,2'-hydroxy-4-methoxybenzophenone.

[0012] Preferably, the polymerization initiator of the present invention is a combination of any two or more of tert-butyl perbenzoate, dibenzoyl peroxide, di-tert-butyl peroxide or 1,1-bis(tert-butyl peroxide)-3,3,5-trimethylcyclohexane, which will not oxidize the blue light absorber, but can ensure the hardness of the lens and avoid excessive shrinkage caused by too many functional groups, resulting in self-molding.

[0013] The present invention also provides a method for preparing the above-mentioned low-refractive blue light-proof resin lens, comprising the following steps:

[0014] Weigh the resin monomer and the blue light absorber and stir them evenly. After the blue light absorber is completely dissolved, add the polymer initiator, stir at room temperature for 2 to 2.5 hours, and then evacuate for 30 to 35 minutes under a vacuum degree of -0.1 MPa to complete the batching;

[0015] Pour the prepared material into the assembled mold and use an air curing furnace for heat curing molding;

[0016] Mould opening and cleaning;

[0017] Use an air curing oven for secondary curing.

[0018] Preferably, the temperature and curing time of the thermal curing molding are as follows: after the air curing furnace is kept at 30°C for 1 to 2 hours, the temperature is increased to 50°C to 60°C after 1 to 2 hours, and then the temperature is increased to 70°C to 75°C after 1 to 2 hours, and then the temperature is increased to 80°C to 90°C after 1 to 2 hours, and the temperature is kept at 10 to 11 hours, and then the temperature is increased to 90°C to 95°C after 5 to 8 hours, and then the temperature is increased to 110°C after 1 to 2 hours, and finally the temperature is reduced to 60°C after 1 to 2 hours.

[0019] Preferably, the curing temperature and curing time of the secondary curing are as follows: the curing temperature is increased from 60° C. to 120° C. in 1 hour, maintained at 120° C. for 2 hours, and then cooled to 50° C. within 1 hour.

[0020] The heating and cooling in the above steps are carried out at a uniform speed.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention introduces a new trifunctional allyl carbonate monomer for preparing blue light blocking resin lenses, and matches it with a suitable initiator and a blue light absorber, as well as a one-time curing molding process and an annealing process, to prepare a low-refractive-index blue light blocking resin lens with a refractive index of 1.50 and an Abbe coefficient of 55±5%.

[0023] (2) The formula of the present invention can not only improve the blue light absorption rate but also ensure the quality of the lens, thereby improving the yield rate. The production raw materials do not need to be imported, which greatly saves production costs and efficiency.

[0024] (3) The anti-blue light resin lens prepared by the present invention has a transmittance of less than 1% in the 410nm band, and an overall blue light absorption rate of 15% to 30% in the 380-500nm range, which meets the anti-blue light standard of national standard 38120-2019. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention will be described in more detail below in conjunction with specific examples.

[0026] Example 1

[0027] A low-refractive blue light-proof resin lens, comprising a resin monomer, a blue light absorber and a polymerization initiator, wherein the resin monomer is a trifunctional allyl carbonate monomer (Wuhan Chunling Technology Co., Ltd., TOM-2000), and the structural formula is

[0028]

[0029] The blue light absorber is 2-hydroxy-4-methoxybenzophenone, and the polymerization initiator is a mixture of tert-butyl peroxybenzoate, dibenzoyl peroxide and 1,1-bis(tert-butyl peroxide)-3,3,5-trimethylcyclohexane (2:2:1).

[0030] The method for preparing the lens comprises the following steps:

[0031] Weigh 100 kg of monomer and 0.5 kg of blue light absorber, mix and stir evenly, add 0.5 kg of polymer initiator after the blue light absorber is completely dissolved, stir for 2 hours under circulating water temperature of 25°C, and evacuate for 30 minutes under vacuum degree of -0.1 MPa to complete the batching;

[0032] The prepared material is poured into the assembled mold, and an air curing furnace is used for heat curing molding. The temperature and curing time of the heat curing molding are as follows: the air curing furnace is kept at 30°C for 1 to 2 hours, then the temperature is raised to 50°C to 60°C for 1 to 2 hours, then the temperature is raised to 70°C to 75°C for 1 to 2 hours, then the temperature is raised to 80°C to 90°C for 1 to 2 hours, and the temperature is kept at 10 to 11 hours, then the temperature is raised to 90°C to 95°C for 5 to 8 hours, then the temperature is raised to 110°C for 1 to 2 hours, and finally the temperature is lowered to 60°C for 1 to 2 hours;

[0033] Mould opening and cleaning;

[0034] Use an air curing oven for secondary curing. The curing temperature and curing time for secondary curing are as follows: the curing temperature is 60°C, raised to 120°C in 1 hour, maintained at 120°C for 2 hours, and then lowered to 50°C within 1 hour.

[0035] Example 2

[0036] A low-refractive blue light-proof resin lens, comprising a resin monomer, a blue light absorber and a polymerization initiator, wherein the resin monomer is a trifunctional allyl carbonate monomer having a structural formula of

[0037]

[0038] The blue light absorber is 2-hydroxy-4-octyloxybenzophenone, and the polymerization initiator is a mixture of dibenzoyl peroxide and di-tert-butyl peroxide (1:1).

[0039] The method for preparing the lens comprises the following steps:

[0040] Weigh 100 kg of monomer and 1 kg of blue light absorber, mix and stir evenly, add 1 kg of polymer initiator after the blue light absorber is completely dissolved, stir for 2 hours under circulating water temperature of 25°C, and evacuate for 30 minutes under vacuum degree of -0.1 MPa to complete the batching;

[0041] The prepared material is poured into the assembled mold, and an air curing furnace is used for heat curing molding. The temperature and curing time of the heat curing molding are as follows: the air curing furnace is kept at 30°C for 1 to 2 hours, then the temperature is raised to 50°C to 60°C for 1 to 2 hours, then the temperature is raised to 70°C to 75°C for 1 to 2 hours, then the temperature is raised to 80°C to 90°C for 1 to 2 hours, and the temperature is kept at 10 to 11 hours, then the temperature is raised to 90°C to 95°C for 5 to 8 hours, then the temperature is raised to 110°C for 1 to 2 hours, and finally the temperature is lowered to 60°C for 1 to 2 hours;

[0042] Mould opening and cleaning;

[0043] Use an air curing oven for secondary curing. The curing temperature and curing time for secondary curing are as follows: the curing temperature is 60°C, raised to 120°C in 1 hour, maintained at 120°C for 2 hours, and then lowered to 50°C within 1 hour.

[0044] Example 3

[0045] A low-refractive blue light-proof resin lens, comprising a resin monomer, a blue light absorber and a polymerization initiator, wherein the resin monomer is a trifunctional allyl carbonate monomer having a structural formula of

[0046]

[0047] The blue light absorber is 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, and the polymerization initiator is a mixture of tert-butyl peroxybenzoate and di-tert-butyl peroxide (1:1).

[0048] The method for preparing the lens comprises the following steps:

[0049] Weigh 100 kg of monomer and 1.8 kg of blue light absorber, mix and stir evenly, add 2 kg of polymer initiator after the blue light absorber is completely dissolved, stir for 2 hours under circulating water temperature of 25°C, and evacuate for 30 minutes under vacuum degree of -0.1 MPa to complete the batching;

[0050] The prepared material is poured into the assembled mold, and an air curing furnace is used for heat curing molding. The temperature and curing time of the heat curing molding are as follows: the air curing furnace is kept at 30°C for 1 to 2 hours, then the temperature is raised to 50°C to 60°C for 1 to 2 hours, then the temperature is raised to 70°C to 75°C for 1 to 2 hours, then the temperature is raised to 80°C to 90°C for 1 to 2 hours, and the temperature is kept at 10 to 11 hours, then the temperature is raised to 90°C to 95°C for 5 to 8 hours, then the temperature is raised to 110°C for 1 to 2 hours, and finally the temperature is lowered to 60°C for 1 to 2 hours;

[0051] Mould opening and cleaning;

[0052] Use an air curing oven for secondary curing. The curing temperature and curing time for secondary curing are as follows: the curing temperature is 60°C, raised to 120°C in 1 hour, maintained at 120°C for 2 hours, and then lowered to 50°C within 1 hour.

[0053] Example 4

[0054] A low-refractive blue light-proof resin lens, comprising a resin monomer, a blue light absorber and a polymerization initiator, wherein the resin monomer is a trifunctional allyl carbonate monomer having a structural formula of

[0055] The blue light absorber is 2,2'-hydroxy-4-methoxybenzophenone, and the polymerization initiator is a mixture of di-tert-butyl peroxide and 1,1-bis(tert-butyl peroxide)-3,3,5-trimethylcyclohexane (1:1).

[0056] The method for preparing the lens comprises the following steps:

[0057] Weigh 100 kg of monomer and 2.5 kg of blue light absorber, mix and stir evenly, add 3 kg of polymer initiator after the blue light absorber is completely dissolved, stir for 2 hours under circulating water temperature of 25°C, and evacuate for 30 minutes under vacuum degree of -0.1 MPa to complete the batching;

[0058] The prepared material is poured into the assembled mold, and an air curing furnace is used for heat curing molding. The temperature and curing time of the heat curing molding are as follows: the air curing furnace is kept at 30°C for 1 to 2 hours, then the temperature is raised to 50°C to 60°C for 1 to 2 hours, then the temperature is raised to 70°C to 75°C for 1 to 2 hours, then the temperature is raised to 80°C to 90°C for 1 to 2 hours, and the temperature is kept at 10 to 11 hours, then the temperature is raised to 90°C to 95°C for 5 to 8 hours, then the temperature is raised to 110°C for 1 to 2 hours, and finally the temperature is lowered to 60°C for 1 to 2 hours;

[0059] Mould opening and cleaning;

[0060] Use an air curing oven for secondary curing. The curing temperature and curing time for secondary curing are as follows: the curing temperature is 60°C, raised to 120°C in 1 hour, maintained at 120°C for 2 hours, and then lowered to 50°C within 1 hour.

[0061] The properties of the lenses prepared in the above examples are shown in Table 1.

[0062] Table 1 Performance test results of the lenses described in the examples

[0063]

[0064] According to the above performance test results, the low-refractive blue light-blocking resin lens of the present invention has high hardness, good blue light-blocking effect, meets the requirements of national standards, and has a high lens qualification rate.

[0065] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Without departing from the scope and technical principles of the described embodiments, many modifications and changes are obvious to those of ordinary skill in the art, and these modifications and changes should also be regarded as the scope of protection of the present invention.

Claims

1. A low-refractive blue light-blocking resin lens, characterized in that: The lens is made of the following components in a weight ratio: resin monomer: blue light absorber: polymerization initiator = 100: (1-1.8): (1.0-2.0), wherein the resin monomer is a trifunctional allyl carbonate monomer; The chemical structural formula of the trifunctional allyl carbonate monomer is:

2. The low-refractive blue light blocking resin lens according to claim 1, characterized in that: The refractive index n of the lens e It is 1.501±0.003, and the Abbe coefficient is 55±5%.

3. The low-refractive blue light blocking resin lens according to claim 1, characterized in that: The blue light absorber is a benzophenone, which is any one or more of 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octyloxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone or 2,2'-hydroxy-4-methoxybenzophenone.

4. The low-refractive blue light blocking resin lens according to claim 1, characterized in that: The polymerization initiator is a combination of any two or more of tert-butyl perbenzoate, dibenzoyl peroxide, di-tert-butyl peroxide or 1,1-bis(tert-butyl peroxide)-3,3,5-trimethylcyclohexane.

5. The method for preparing the low-refractive blue light blocking resin lens according to claim 1, characterized in that: The following steps are involved: Weigh the resin monomer and the blue light absorber and stir them evenly. After the blue light absorber is completely dissolved, add the polymer initiator, stir at room temperature for 2 to 2.5 hours, and then evacuate for 30 to 35 minutes under a vacuum degree of -0.1 MPa to complete the batching; Pour the prepared material into the assembled mold and use an air curing furnace for heat curing molding; Mould opening and cleaning; Use an air curing oven for secondary curing.

6. The method for preparing the blue light blocking resin lens according to claim 5, characterized in that The temperature and curing time of the thermal curing molding are as follows: after the curing temperature of the air curing furnace is kept at 30°C for 1 to 2 hours, the temperature is increased to 50°C to 60°C after 1 to 2 hours, the temperature is increased to 70°C to 75°C after 1 to 2 hours, the temperature is increased to 80°C to 90°C after 1 to 2 hours, the temperature is kept at 10 to 11 hours, the temperature is increased to 90°C to 95°C after 5 to 8 hours, the temperature is increased to 110°C after 1 to 2 hours, and finally the temperature is reduced to 60°C after 1 to 2 hours.

7. The method for preparing the blue light blocking resin lens according to claim 5, characterized in that The curing temperature and curing time of the secondary curing are as follows: the curing temperature is raised from 60° C. to 120° C. in 1 hour, maintained at 120° C. for 2 hours, and then lowered to 50° C. within 1 hour.

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