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Method for preparing silicone-hydrogel contact lens which can be mechanically demolded
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A silicone hydrogel, contact lens technology, applied in glasses/goggles, instruments, optics, etc., can solve problems such as increasing the production cost of silicone hydrogel products, achieve dimensional stability, simplify the cleaning process, and reduce production costs. Effect
Active Publication Date: 2019-05-24
华诺森(武汉)生物医药技术有限公司
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The production process of silicone hydrogel usually includes a 50%-100% alcohol solution cleaning step, while HEMA products are usually only washed with water, which also increases the production cost of silicone hydrogel products
Method used
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Embodiment 1
[0021] 1.1 Preparation of lens
[0022] Add the following materials in sequence in a stirred 5L three-necked flask: A, B, C, F, G, H, E, D.
[0023] A N,N-dimethylacrylamide: 5 parts
[0024] B N-methyl-N-vinylacetamide: 13 parts
[0025] C N-vinylpyrrolidone: 20 parts
[0026] D Methacryloxypropyl tris(trimethylsiloxane)silane: 20 parts
[0030] H 2-(4-benzoyl-3-hydroxyphenoxy)ethyl 2-acrylate: 1.0 parts
[0031] Stir at a low speed at 25 degrees to dissolve all the materials, mix evenly, and stir for more than 0.5 hours. The resulting mixture was filtered through a press filter with a pore size of 0.2 micron to obtain a polymerization solution. Inject liquid through an automatic liquid injectionmachine, close the mold, and then transfer the closed mold to an oven for curing. The curing procedure is as follows: the room temper...
Embodiment 1～7
[0043] Embodiment 1~7 is except that formula is changed, and all the other operations operate in the same way as in Example 1, and the results are shown in Table 1:
[0044]
[0045] Table 1 Embodiment 1~7 formula and main result
Embodiment 2
[0047] Add the following in sequence to a stirred 10L three-necked flask: A, B, C, F, G, H, E, D.
[0048] A N,N-dimethylacrylamide: 5 parts
[0049] B N-methyl-N-vinylacetamide: 13 parts
[0050] C N-vinylpyrrolidone: 20 parts
[0051] D Methacryloxypropyl tris(trimethylsiloxane)silane: 20 parts
[0055] H 2-(4-benzoyl-3-hydroxyphenoxy)ethyl 2-acrylate: 0.5 parts
[0056] Stir at a low speed at 25 degrees to dissolve all the materials, mix evenly, and stir for more than 0.5 hours. The resulting mixture was filtered through a press filter with a pore size of 0.2 micron to obtain a polymerization solution. Liquid injection and mold closing are performed through the full mold automatic liquid injectionmachine, and then the completed mold is transferred to an oven for curing. The curing procedure is as follows: room temperature ris...
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Abstract
The invention relates to a method of preparing a silicone-hydrogel contact lens which can be mechanically demolded. The oxygenpermeability coefficient of the silicone-hydrogel contact lens is 2-8 times higher than that of a traditional HEMA contact lens. Oxygen permeability is one of the most important indicators for measuring the health level and comfort level of wearing of contact lenses. The silicone-hydrogel contact lens is the upgrading trend of the contact lens industry, and high-efficiency and low-cost production of the silicone-hydrogel contact lens is the research direction. After materials obtained according to a traditional HEMA liquid formulation are polymerized and cured, a dry lens body is very hard and is generally separated from a plastic mold mechanically to obtain the lens, then simple hydration is conducted, and packaging and sterilizing can be conducted. Materials of the silicone-hydrogel lens have soft properties, and demolding production cannot be conducted through the HEMA process. According to the method, the formulation of the silicone-hydrogel contact lens is improved, and the hardness of the dry lens body is improved, so that the HEMA process is used toseparate the dry lens body from the mold; in other words, demolding can be mechanically conducted; equipment for HEMA lens production is applied, cost is reduced, and efficiency is also improved.
Description
technical field [0001] The invention relates to a method for preparing a silicone hydrogel contact lens which is mechanically released. Background technique [0002] The oxygen permeability of contact lenses is one of the most important indicators to measure the wearing health and comfort. The oxygenpermeability coefficient of contact lenses made of silicone hydrogel material is 2-8 times higher than that of traditional HEMA contact lenses, which opens up the replacement of contact lenses in the direction of healthier and more comfortable. The world's leading contact lens production companies have successfully developed several products with excellent performance, such as CooperVision's "Biofinity"; Johnson & Johnson's "Ou Comfort", etc. The excellent performance of the product has led the rapid replacement of the contact lens industry in the world. After the traditional HEMA liquid formula is polymerized and cured, the dry lens is very hard. Generally, the dry lens is se...
Claims
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Application Information
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