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Silica hydrogel contact lens and formula and preparation method thereof

A technology for contact lenses and silicone hydrogels, which is applied to instruments, optical components, optics, etc., can solve the problems of insufficient hardness, low pass rate, lens damage, etc., and achieve the effects of saving production costs, low cost, and high pass rate.

Pending Publication Date: 2022-06-28
华诺森(武汉)生物医药技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hardness of the lens prepared by this method still needs to be improved, and the hardness is not enough. The mechanical demoulding method has a certain probability of causing damage to the lens, the quality is unstable, and the qualified rate is only about 78%. This problem needs to be further solved.

Method used

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  • Silica hydrogel contact lens and formula and preparation method thereof
  • Silica hydrogel contact lens and formula and preparation method thereof
  • Silica hydrogel contact lens and formula and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The formula of this example is shown in Table 1:

[0039] Table 1

[0040]

[0041] The preparation method of the silicone hydrogel contact lens of the present embodiment comprises the following steps:

[0042] S1. Stir at a low speed at 25°C to dissolve all the above materials and mix them evenly. The stirring time is more than 0.5 hours. The obtained mixed solution was filtered through a pressure filter with a pore size of 0.2 microns to obtain a polymerization solution. The mold is injected into the mold by an automatic liquid injection machine, and the mold is closed, and then the closed mold is transferred to a nitrogen oven for curing. The mold is made of polybutylene terephthalate (PBT) material or polypropylene (PP) material.

[0043] The curing procedure is as follows: the room temperature is raised to 65°C for 30 minutes, then the temperature is increased to 95°C at a constant rate for 1 hour, the temperature is kept for 1 hour, the heat is stopped, and t...

Embodiment 2

[0049] The formula of the present embodiment is shown in Table 2:

[0050] Table 2

[0051]

[0052] The preparation method of the silicone hydrogel contact lens of the present embodiment comprises the following steps:

[0053] S1. Stir at a low speed at 25°C to dissolve all the above materials and mix them evenly. The stirring time is more than 0.5 hours. The obtained mixed solution was filtered through a pressure filter with a pore size of 0.2 microns to obtain a polymerization solution. The mold is injected into the mold by an automatic liquid injection machine, and the mold is closed, and then the closed mold is transferred to a nitrogen oven for curing. The mold is made of polybutylene terephthalate (PBT) material or polypropylene (PP) material.

[0054] The curing procedure is as follows: the room temperature is raised to 65°C for 30 minutes, then the temperature is increased to 95°C at a constant rate for 1 hour, the temperature is kept for 1 hour, the heat is stop...

Embodiment 3

[0058] The formula of the present embodiment is shown in Table 3:

[0059] table 3

[0060]

[0061] The preparation method of the silicone hydrogel contact lens of the present embodiment comprises the following steps:

[0062] S1. Stir at a low speed at 25°C to dissolve all the above materials, mix evenly, and stir for more than 0.5 hours. The obtained mixed solution was filtered through a pressure filter with a pore size of 0.2 microns to obtain a polymerization solution. The mold is injected into the mold by an automatic liquid injection machine, and the mold is closed, and then the closed mold is transferred to a nitrogen oven for curing. The mold is made of polybutylene terephthalate (PBT) material or polypropylene (PP) material.

[0063]The curing procedure is as follows: the room temperature is raised to 65°C for 30 minutes, then the temperature is increased to 95°C at a constant rate for 1 hour, the temperature is kept for 1 hour, the heat is stopped, and the plas...

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Abstract

The invention provides a silicone hydrogel contact lens and a formula thereof. The silicone hydrogel contact lens comprises the following components in percentage by mass: 30-65% of hydroxyethyl methylacrylate; 10% to 27% of N-vinyl pyrrolidone; 10 to 27% of N-methyl-N-vinyl acetamide; 12-26% of a silicon monomer; the silicon monomer at least contains 50% by weight of 3-(3-methacryloyloxy-2-hydroxypropoxy) propyl bis (trimethylsiloxy) methylsilane, and the silicon monomer contains at least 50% by weight of 3-(3-methacryloyloxy-2-hydroxypropoxy) propyl bis (trimethylsiloxy) methylsilane; 0.5%-0.7% of a cross-linking agent; and 0.5% of an initiator. The hardness of the lens prepared by adopting the formula and the method disclosed by the invention is more than 40D, and a dry lens can be obtained through direct separation by adopting a direct mechanical extrusion mold under a hydrophilic mold, so that the technological process is simplified, and the production cost is reduced. And when the product of a company is upgraded to the silicone hydrogel contact lens, the original hydrogel production equipment can be directly used. The formula is improved, so that a product finally produced by mechanical demolding is high in percent of pass, the lens is not damaged, and compared with a product produced by an original technology, the product is more stable in quality.

Description

technical field [0001] The invention belongs to the field of contact lens manufacturing, and in particular relates to a silicon hydrogel contact lens and a formula and a preparation method thereof. Background technique [0002] Since the first silicone hydrogel contact lens (commonly known as contact lens) came out in 1999, due to its high oxygen permeability, silicone hydrogel contact lens products have occupied more than 60% of the global market share. [0003] In terms of production methods, injection molding has become the preferred method for preparing large-scale gel contact lenses. The present invention focuses on the preparation of silicone hydrogel contact lenses by injection molding. The preparation method of silicone hydrogel contact lenses is much more complicated than that of hydrogel contact lenses. First, curing often needs to be carried out in nitrogen, and it takes a long time; second, due to the addition of silicon-containing monomer materials, the cured ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/20C08F226/10C08F226/02C08F230/08G02B1/04
CPCC08F220/20G02B1/043C08F226/10C08F226/02C08F230/085
Inventor 张爱军
Owner 华诺森(武汉)生物医药技术有限公司
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