CN110804337A - Contact lens color ink, brightener used for contact lens color ink and preparation method of brightener - Google Patents

Abstract

The invention relates to a contact lens, in particular to a contact lens color ink, a brightener used for the contact lens color ink and a preparation method of the brightener. The brightening agent for the contact lens color ink comprises the following components in percentage by mass: surfactant (b): 0.3% -9%, dispersant: 0.2% -6%, lubricant: 4% -20%, solvent: 65 to 85 percent; the preparation method comprises the following steps: firstly, adding a solvent, then, slowly adding a lubricant, a surfactant and a dispersing agent in sequence according to a ratio, continuously stirring in the adding process, then, stirring for 30-60 minutes by using a magnetic stirrer to obtain the brightener, and then, sealing the stirred brightener and storing the brightener in an environment at 0-20 ℃. The brightener disclosed by the invention can be used for increasing the chromaticity, uniformity and stability of the ink, and is simple in preparation method and low in cost.

Description

Contact lens color ink, brightener used for contact lens color ink and preparation method of brightener

The technical field is as follows:

the invention relates to a contact lens, in particular to a contact lens color ink, a brightener used for the contact lens color ink and a preparation method of the brightener.

Background art:

the color contact lens is also called as beauty pupil, belongs to a third class of medical appliances, and compared with the common contact lens, the beauty pupil has an additional pigment layer capable of changing the color of eyes, can change the color of the eyes by wearing the beauty pupil on a cornea, and has the visual effect of enlarging the pupil, and merchants design different patterns through the pigment layer so as to achieve different wearing effects. The beauty pupil is different from the common contact lenses, the common contact lenses can be worn by only myopic people, the beauty pupil is not only suitable for the myopic people, but also can be worn by people with healthy vision, because the beauty pupil has two differences of flat light and power, if the beauty pupil is myopic, the lens with corresponding power can be selected, and if the beauty pupil is not myopic, the flat light lens can be directly selected.

In the current years, the beauty pupil has become a necessary fashion single for many young people to pursue the perfection of fashion personality. When people select the beautiful pupil, the style and the color of the decorative pattern play a decisive role. At present, the patterns of the colored contact lenses on the market are thousands of patterns, the colors of the patterns are different, and consumers tend to have the patterns and the colors with bright colors and obvious wearing effects when selecting the patterns, so that the merchants design the latest patterns by a method and match the most suitable colors.

However, some very good patterns cannot effectively attract the eyes of consumers after being matched with proper colors, the market performance is not ideal, and finally the market feedback obtained by investigation shows that the reasons are mostly that the colors are dull or the wearing effect is not obvious enough. Under such circumstances, it is necessary to provide a contact lens ink which can develop colors of various patterns and has a more obvious wearing effect according to a production process of a color contact lens, so that more excellent patterns can be commercially favored, thereby providing more choices for consumers.

The invention content is as follows:

the invention aims to provide a contact lens color ink, a brightener used by the contact lens color ink and a preparation method of the brightener, and aims to enable the color of patterns to be more developed and the wearing effect to be more obvious. The technical scheme adopted by the invention is as follows:

the brightening agent for the contact lens color ink comprises the following components in percentage by mass:

surfactant (b): 0.3% -9%, dispersant: 0.2% -6%, lubricant: 4% -20%, solvent: 65 to 85 percent;

the surfactant is at least one of coconut diethanolamide, ethylene oxide-propylene oxide copolymer, alkylolamide phosphate, octyl phenol polyoxyethylene ether, sorbitan monolaurate and lauryl alcohol polyoxyethylene ether;

the dispersant is at least one of sodium lignosulphonate, vinyl distearamide, glyceryl monostearate and polyethylene glycol 4000;

the lubricant is at least one of polydimethylsiloxane, fatty acid methyl ester, erucamide, hydroxypropyl acrylate and superfine silica gel powder;

the solvent is at least one of hydroxyethyl methacrylate, methacrylamide, glycidyl methacrylate, ethanol and acetone.

The preparation method of the brightener comprises the following steps:

firstly, adding a solvent into a container;

sequentially adding the lubricant, the surfactant and the dispersant according to the mass percentage, and continuously stirring in the adding process;

and then stirring the mixture for 30 to 60 minutes by using a magnetic stirrer to obtain the brightener.

The contact lens color ink containing the brightener comprises the following components in percentage by mass:

pigment: 5% -35%, intermediate: 65% -95%, curing agent: 0.5% -3%, brightener: 0.01 to 1.5 percent.

The intermediate acts as a diluent and the process for preparing the intermediate comprises the steps of:

step a: preparation of the starting materials

The preparation of the oligomer comprises the following raw materials in percentage by weight: 1-dodecyl mercaptan: 0.2% -3%, lauryl methacrylate: 0.1% -2%, methacrylic acid: 1% -5%, hydroxyethyl methacrylate: 60% -90%, ethyl 2-hydroxypropionate: 0.5% -5%, o-ethoxyphenol: 2% -15%, azobisisobutyronitrile: 0.1% -5%, cyclopentanone: 0.1 to 5 percent; the raw materials are mixed and react to form oligomer;

the retarder is prepared from the following raw materials in percentage by weight: hydroxyethyl methacrylate: 50% -90%; 1-vinyl-2-pyrrolidone: 3% -30%; methacrylic acid: 1% -5%; ethylene glycol dimethacrylate: 0.5 to 8 percent; glycerol: 1% -10%; polyethylene glycol monomethyl ether: 0.1 to 1 percent; polyvinylpyrrolidone K30: 0.5 to 5 percent; the raw materials are mixed and reacted to form a retarder;

curing agent: hexamethylene diisocyanate;

step b: the oligomer, the retarder and the curing agent are added according to the following weight percentage, and the oligomer accounts for 25-75%; 22 to 70 percent of retarder; 1% -2% of a curing agent; mixing, and stirring to obtain intermediate.

The preparation method of the contact lens color ink comprises the following steps:

step 1: firstly, adding the intermediate into a container, then adding the pigment, uniformly stirring, and then placing for 8-30 hours at room temperature; the pigment is defined in title 73 of the American FDA Federal regulations Collection (CFR) 21 st catalog: list of certified exempt color additives, clause 74: the range of a list of pigment additives suitable for certification;

step 2: adding the mixture into a grinding machine for processing to obtain thick ink;

and step 3: firstly, adding required thick ink into an oil cup according to a printing proportion, then adding an intermediate into the oil cup, then adding a brightening agent, finally adding a curing agent, and uniformly stirring by using a centrifugal stirrer to obtain thin ink, wherein the thin ink can be directly used for the printing production process of the contact lenses.

The invention has the beneficial effects that:

the color ink for the contact lens has a good color developing effect, and the wearing effect of the prepared contact lens is obvious.

Secondly, the preparation method of the contact lens color ink is simple and easy to operate.

And thirdly, the brightener disclosed by the invention can be used for increasing the chromaticity, uniformity and stability of the ink, and is simple in preparation method and low in cost.

Description of the drawings:

FIG. 1 shows that the color ink without brightener is left at room temperature for 8 hours, wherein the abscissa 1, 2, 3 represents ink 1, ink 2, ink 3, and the ordinate represents the mass percent of the color ink; wherein series 1 represents the curve before standing for 8 hours and series 2 represents the curve after standing for 8 hours; as can be seen from the figure, the concentration of the ink decreased when left for 8 hours.

FIG. 2 is a diagram of the color ink with brightener added, which is placed in a normal temperature environment for 8 hours, wherein the abscissa 4, 5, 6 represents the ink 4, 5, 6, and the ordinate represents the mass percentage of the color ink; wherein series 1 represents the curve before standing for 8 hours and series 2 represents the curve after standing for 8 hours; as can be seen from the figure, the ink uniformity and stability of the ink added with the brightener are obviously improved after the ink is placed for 8 hours.

The specific implementation mode is as follows:

example (b):

preparing a brightening agent:

adding 97.5g of ethanol into a round-bottom flask, heating the round-bottom flask to 50 ℃, then sequentially and slowly adding 11.75g of erucamide and 10.5g of alkylolamide phosphate, continuously stirring the mixture during the adding process until the erucamide and the alkylolamide phosphate are completely dissolved, reacting for 1 hour, cooling the mixture to room temperature, then slowly adding 4.2g of polyethylene glycol 4000 into the flask, and stirring the mixture for 30-60 minutes by using a magnetic stirrer to obtain the brightener. The stirred brightener is sealed and placed in a refrigerated cabinet for storage. The preparation process of the brightener is carried out in a fume hood.

(II) preparation of intermediate:

step a: raw materials

Preparation of oligomer: 1g of 1-dodecyl mercaptan, 1g of lauryl methacrylate, 2g of methacrylic acid, 87g of hydroxyethyl methacrylate, 2g of ethyl 2-hydroxypropionate, 5g of o-ethoxyphenol and 0.2g of azobisisobutyronitrile are sequentially added into a three-neck flask, the flask is connected with a stirrer, and the stirrer is started to start stirring;

after stirring for about 30 minutes, the flask was continuously purged with nitrogen while stirring, and 0.8g of cyclopentanone was added while stirring; after addition of cyclopentanone, the flask was filled with a rubber plugSealing the openings and keeping the sealing; drilling two holes on a rubber plug of a bottle opening on the left side, and respectively inserting a temperature sensor and a nitrogen injection port; drilling a hole on a rubber plug of the middle bottle mouth, inserting a stirring rod with an impeller into the bottle mouth, and fixing the stirring rod with an adhesive tape; drilling a hole on the rubber plug of the right bottle mouth

One end of the rubber tube is inserted into the hole, and the other end is inserted into the water barrel to check whether bubbles are discharged; each rubber plug is sealed by an adhesive tape to keep air tightness; continuously adjusting a pressure gauge according to the quantity of discharged air bubbles, wherein the diameters of the air bubbles are 2-3 mm, and the air bubbles are discharged at intervals of 0.5 second; heating the flask by using a heating cover, setting the temperature of the heating cover to 70 +/-1 ℃, and adjusting the voltage to ensure that the temperature gradually reaches the set temperature from room temperature within 30 minutes; reaction time: nitrogen was injected without opening the heating mantle, and prepolymerization was carried out for 1 hour, then the heating mantle was opened, and it was allowed to run for 24 hours; after the reaction is finished, obtaining the required oligomer, then putting the oligomer obtained by the reaction into a brown glass bottle, and cooling to room temperature; in the synthesis process of the oligomer, the room temperature is kept at 23-25 ℃; the viscosity of the oligomer can be adjusted by controlling the amount of cyclopentanone added, and is also affected by the amount of nitrogen charged and the reaction time.

Preparation of the retarder: adding 86g of hydroxyethyl methacrylate, 6g of 1-vinyl-2-pyrrolidone, 3.5g of methacrylic acid, 1g of ethylene glycol dimethacrylate, 2g of glycerol and 0.5g of polyethylene glycol monomethyl ether into a beaker in sequence, putting an impeller of a stirrer into the beaker, starting the stirrer to stir, and dissolving the stirrer; fixing a beaker by using a fixing clamp, and adding 1g of polyvinylpyrrolidone K30 into the beaker, wherein the shrinkage phenomenon can be caused by too much addition amount; if the beaker is not fixed, polyvinylpyrrolidone K30 will cause viscosity to rise when dissolved, thereby possibly burning out the stirrer; after the polyvinylpyrrolidone K30 is dissolved, the retarder is obtained; after about 30 minutes, it is sealed and may be stored at a low temperature or used immediately.

Curing agent: hexamethylene diisocyanate

Step b: the oligomer, the retarder and the curing agent are added according to the following weight, 32g of the prepared oligomer and 38g of the retarder are added into a beaker, and 1g of the curing agent hexamethylene diisocyanate is added; the beaker is fixed by a fixing clamp, then an impeller of the stirrer is placed into the beaker, and the stirrer is operated and stirred for 30 minutes to obtain an intermediate.

(III) preparation of color ink for contact lenses:

step 1: 54g of the intermediate was first added to a beaker, followed by 18g of the desired pigment in the beaker and stirred well with a glass rod, and then left at room temperature for 24 hours.

Step 2: adding the mixture into a three-roller grinding machine for homogenization, and adjusting the gap of the three-roller grinding machine to obtain thick ink; then putting the mixture into a vacuum storage bag, sticking a label, and storing the mixture in an environment of 0-20 ℃.

And step 3: firstly, adding required thick ink into an oil cup according to a printing proportion, then adding 74.4g of intermediate into the oil cup, then adding 1.5g of brightening agent, finally adding 2.1g of curing agent, and uniformly stirring by using a centrifugal stirrer to obtain thin ink, wherein the thin ink can be directly used in the printing production process of the contact lenses.

And (3) performance testing:

chroma:

6 lenses with the same patterns are placed on a chromaticity observation table, the table surface is wiped clean by alcohol, then the 6 lenses are respectively tested by a spectrocolorimeter, and the measured CMYK printing color mode results are as follows:

numbering	C cyan	M magenta	Yellow colour Y	K Black
					Lens a	73	0	0	0
Lens b	76	0	0	0
					Lens c	74	0	0	0
Lens d	81	0	0	0
					Lens e	84	0	0	0
Lens f	83	0	0	0

The ink, the intermediate and the pigment are mixed in the same ratio in the 6 lenses in the above table, wherein the brightener is not added to the ink used for the lens a, the lens b and the lens c, and the brightener is added to the ink used for the lens d, the lens e and the lens f. From the CMYK results obtained from the tests it can be seen that: in the case where the chromaticity of M, Y, K three colors is completely the same, the average value of C cyan for the lens d, the lens e, and the lens f is 82.67, which is larger than the average value 74.33 of C cyan for the lens a, the lens b, and the lens C. After that, the above experiment was repeated 5 times, all of which gave the above results.

To show the statistical difference between the two sets of data, the data in the table were subjected to a t-test, and the test results were concluded from the P-values as follows:

and (3) looking up a distribution boundary value table to obtain the degree of freedom upsilon-1-3-1-2: t is t_0.05/2,22.920, in this case t 24.412 > 2.920, and P < 0.05, the difference being statistically significant. Thus showing that the brightener has a remarkable effect of improving the chroma of the lens color.

(II) uniformity and stability:

measuring 6 parts of color ink with the same mixture ratio of the intermediate and the pigment by using a beaker, stirring for 5 minutes by using a centrifugal stirrer, wherein the mass of each part of the color ink is 20g, weighing 1g of the color ink from the surface of each part of the ink respectively, and testing, wherein the measured content percentage of the pigment in the ink is as follows:

numbering	Ink	1	Ink 2	Ink 3	Ink 4	Ink 5	Ink 6
								Content (wt.)	14.8	10.2	12.4	11.6	12.3	12.0

Placing 6 parts of the color ink for 8 hours at normal temperature, weighing 1g of the color ink from the surface of each part of the ink respectively, and testing, wherein the measured content percentage of the pigment in the ink is as follows:

numbering	Ink	1	Ink 2	Ink 3	Ink 4	Ink 5	Ink 6
								Content (wt.)	10.6	7.5	8.8	11.8	12.1	12.1

The ink 1, the ink 2 and the ink 3 described in the above two tables have no brightener added thereto, and the ink 4, the ink 5 and the ink 6 have a brightener added thereto. From the content results obtained from the tests, it can be seen that: the uniformity and stability of ink 1, ink 2 and ink 3 are significantly lower than those of ink 4, ink 5 and ink 6, and the specific curves are shown in fig. 1 and fig. 2, thereby illustrating that the brightener has an effect on the uniformity and stability of the ink.

Claims (6)

1. The brightening agent for the contact lens color ink is characterized by comprising the following components in percentage by mass:

surfactant (b): 0.3% -9%, dispersant: 0.2% -6%, lubricant: 4% -20%, solvent: 65 to 85 percent;

the surfactant is at least one of coconut diethanolamide, ethylene oxide-propylene oxide copolymer, alkylolamide phosphate, octyl phenol polyoxyethylene ether, sorbitan monolaurate and lauryl alcohol polyoxyethylene ether;

the dispersant is at least one of sodium lignosulphonate, vinyl distearamide, glyceryl monostearate and polyethylene glycol 4000;

the lubricant is at least one of polydimethylsiloxane, fatty acid methyl ester, erucamide, hydroxypropyl acrylate and superfine silica gel powder;

the solvent is at least one of hydroxyethyl methacrylate, methacrylamide, glycidyl methacrylate, ethanol and acetone.

2. A method for producing a brightening agent for color ink of contact lenses according to claim 1, comprising the steps of:

firstly, adding a solvent into a container;

sequentially adding the lubricant, the surfactant and the dispersant according to the mass percentage, and continuously stirring in the adding process;

and then stirring the mixture for 30 to 60 minutes by using a magnetic stirrer to obtain the brightener.

3. A contact lens color ink comprising the brightener as defined in claim 1, wherein the ink comprises the following components in mass percent:

pigment: 5% -35%, intermediate: 65% -95%, curing agent: 0.5% -3%, brightener: 0.01 to 1.5 percent.

4. A contact lens color ink of a brightener as set forth in claim 3, wherein said intermediate is made by a process comprising the steps of:

step 1: preparation of the starting materials

The preparation of the oligomer comprises the following raw materials in percentage by weight: 1-dodecyl mercaptan: 0.2% -3%, lauryl methacrylate: 0.1% -2%, methacrylic acid: 1% -5%, hydroxyethyl methacrylate: 60% -90%, ethyl 2-hydroxypropionate: 0.5% -5%, o-ethoxyphenol: 2% -15%, azobisisobutyronitrile: 0.1% -5%, cyclopentanone: 0.1 to 5 percent; the raw materials are mixed and react to form oligomer;

the retarder is prepared from the following raw materials in percentage by weight: hydroxyethyl methacrylate: 50% -90%; 1-vinyl-2-pyrrolidone: 3% -30%; methacrylic acid: 1% -5%; ethylene glycol dimethacrylate: 0.5 to 8 percent; glycerol: 1% -10%; polyethylene glycol monomethyl ether: 0.1 to 1 percent; polyvinylpyrrolidone K30: 0.5 to 5 percent; the raw materials are mixed and reacted to form a retarder;

curing agent: hexamethylene diisocyanate;

step 2: the oligomer, the retarder and the curing agent are added according to the following weight percentage, and the oligomer accounts for 25-75%; 22 to 70 percent of retarder; 1% -2% of a curing agent; mixing, and stirring to obtain intermediate.

5. A method of producing a contact lens color ink according to claim 3, comprising the steps of:

step 1: firstly, adding the intermediate into a container, then adding the pigment, uniformly stirring, and then placing for 8-30 hours at room temperature;

step 2: adding the mixture into a grinding machine for processing to obtain thick ink;

and step 3: firstly, adding required thick ink into an oil cup according to a printing proportion, then adding an intermediate into the oil cup, then adding a brightening agent, finally adding a curing agent, and uniformly stirring by using a centrifugal stirrer to obtain thin ink, wherein the thin ink can be directly used for the printing production process of the contact lenses.

6. The method for preparing a contact lens color ink according to claim 5, wherein the step 2 is:

step 2: adding the mixture into a three-roller grinding machine for homogenization, and adjusting the gap of the three-roller grinding machine to obtain thick ink; then putting the mixture into a vacuum storage bag, sticking a label, and storing the mixture in an environment of 0-20 ℃.

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