Resin dye liquor as well as preparation method and application thereof

Abstract

The invention provides a resin dye liquor as well as a preparation method and application thereof, the resin dye liquor comprises a dyeing assistant, a surfactant, a disperse dye and a diluent in specific parts, and the average hydrophilic-hydrophobic equilibrium value of the surfactant is 8.5-12; the above components are reasonably matched, and the average hydrophilic-hydrophobic equilibrium value of the surfactant is limited to be within a specific range, so that the obtained resin dye liquor has an excellent dyeing effect on resin, the dyed resin is high in color fastness, not prone to fading and low in light transmittance, meanwhile, the resin dye liquor can be repeatedly used, and the cost is reduced. The excellent dyeing effect on the resin can still be ensured after repeated use for multiple times.

Description

Technical Field

[0001] The present invention belongs to the technical field of dyeing solutions, and particularly relates to a resin dyeing solution, a preparation method thereof, and an application thereof. Background Art

[0002] Compared with colored glass, optical resin has the characteristics of light texture, excellent processing performance, and strong impact resistance, and has gradually become the preferred choice in the application field of colored materials. At present, optical resin materials can be processed into products such as lenses, windshield glasses, polarizers, polarizing films, indoor lighting fixtures, anti-reflection films, optical cards, grating disks, filter elements, liquid crystal display elements, and optical waveguide elements. When optical resin products or particles are applied in certain fields, in order to enhance aesthetics, or to reduce light transmittance, or to reduce glare, color masterbatches based on resin are usually used for coloring. Compared with color masterbatch coloring, which will affect molds and the like during the processing process, coloring optical resin products with a resin dyeing solution has obvious flexibility.

[0003] With the expansion of the application scope of optical resin, there are many studies and reports on the high-quality dyeing of optical resin. For example, CN114167527A adds one of carbon nanotubes and carbon black to the light-shielding area through dyeing to minimize the light transmittance and light reflectance in the visible light region; however, the carbon nanotubes and carbon black used in this invention are difficult to form a homogeneous liquid, and precipitation is likely to occur during the standing process and cannot be reused multiple times. In addition, CN119194880A discloses a co-dyeing agent composition for dyeing optical resin, a dyeing method for optical resin, and a dyed optical resin. By adding auxiliary agents, the reuse of the dyeing solution can be achieved; however, adding auxiliary agents will lead to complex operation steps and increased costs, and it is difficult to control the dyeing quality after repeated dyeing with the added auxiliary agents.

[0004] Therefore, in view of the above technical problems, it is of great value to develop a resin dyeing solution with good dyeing effect, not easy to decolorize after coloring, and reusable. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a resin dyeing solution, a preparation method thereof, and an application thereof. The resin dyeing solution has excellent dyeing effect on resin, the dyed resin has high color fastness, is not easy to fade, has a lower light transmittance, and at the same time, the resin dyeing solution can be reused multiple times, and can still ensure excellent dyeing effect on resin after being reused multiple times.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a resin dyeing solution, which comprises the following components in parts by weight:

[0008] Co-dyeing agent 20 - 50 parts by weight;

[0009] Surfactant: 2.5 to 7.5 parts by weight;

[0010] Disperse dye: 1.5 to 5 parts by weight;

[0011] Diluent: 50 to 80 parts by weight;

[0012] The average hydrophilic-lipophilic balance value of the surfactant is 8.5 to 12.

[0013] The resin dyeing solution provided by the present invention includes specific amounts of dyeing assistants, surfactants, disperse dyes, and diluents. Through the reasonable combination of the above components and by limiting the average hydrophilic-lipophilic balance value (average HLB value) of the surfactant within a specific range, the resin has high color fastness after being dyed with the resin dyeing solution, is not prone to color fading, has a relatively low light transmittance, and has high dyeing quality. At the same time, the dyeing solution can be reused multiple times, and excellent dyeing effects on the resin can still be ensured after multiple repeated uses.

[0014] In the present invention, if the surfactant used is a single surfactant, its average hydrophilic-lipophilic balance value (HLB 平均 ) is the HLB value of this single type of surfactant itself, which is a fixed value; if the surfactant used is a compound surfactant, its HLB 平均 can be calculated according to the following formula:

[0015] Let the dosages of N compound surfactants be m A , m B , m C , ……, m N , all in parts by weight, and their HLB values are HLB A , HLB B , HLB C , ……, HLB N , respectively. Then HLB 平均 = (HLB A × m A + HLB B × m B + …… + HLB N × m N ) / (m A + m B + …… + m N ).

[0016] In the present invention, the dosage of the dyeing assistant can be 20 parts by weight, 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight, 30 parts by weight, 32 parts by weight, 34 parts by weight, 36 parts by weight, 38 parts by weight, 40 parts by weight, 42 parts by weight, 44 parts by weight, 46 parts by weight, 48 parts by weight, 50 parts by weight, etc.

[0017] The dosage of the surfactant can be 2.5 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 7.5 parts by weight, etc.

[0018] The dosage of the disperse dye can be 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, 5 parts by weight, etc.

[0019] The dosage of the diluent can be 50 parts by weight, 55 parts by weight, 60 parts by weight, 65 parts by weight, 70 parts by weight, 75 parts by weight, 80 parts by weight, etc.

[0020] The average hydrophilic-lipophilic balance value of the surfactant can be 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, etc. If the average hydrophilic-lipophilic balance value of the surfactant is too low or too high, it is likely to cause the obtained resin dye solution to layer, unable to achieve uniform dispersion, and affecting the subsequent dyeing effect of the resin.

[0021] Preferably, the boiling point of the dyeing assistant ≥ 95 °C, such as 95 °C, 95.2 °C, 95.4 °C, 95.6 °C, 95.8 °C, 96 °C, 97 °C, 98 °C, 99 °C, etc.

[0022] In the present invention, limiting the boiling point of the dyeing assistant within the above range can better ensure that the obtained resin dye solution can still have a high dyeing quality for the resin after being reused multiple times.

[0023] Preferably, the difference between the solubility parameter of the dyeing assistant and the solubility parameter of the resin to be dyed ≤ 2 (cal / cm 3 ) 1 / 2 , such as 2.0 (cal / cm 3 ) 1 / 2 , 1.8 (cal / cm 3 ) 1 / 2 , 1.6 (cal / cm 3 ) 1 / 2 , 1.4 (cal / cm 3 ) 1 / 2 , 1.2 (cal / cm 3 ) 1 / 2 , 1 (cal / cm 3 ) 1 / 2, 0.8 (cal / cm 3 ) 1 / 2 , 0.6 (cal / cm 3 ) 1 / 2 , 0.4 (cal / cm 3 ) 1 / 2 , 0.2 (cal / cm 3 ) 1 / 2 or 0 (cal / cm 3 ) 1 / 2 etc.

[0024] Preferably, the mordant includes any one or a combination of at least two of propylene glycol methyl ether, tert-butyl cellosolve, durene, xylene, mesitylene, methylcyclohexane, propylene glycol diacetate, propylene carbonate, triethylene glycol, ethylene glycol diacetate, glycerol or benzyl alcohol.

[0025] Preferably, the surfactant includes a combination of surfactant A and surfactant B;

[0026] Surfactant A includes any one or a combination of at least two of sodium dodecyl sulfonate, alkylbenzene sulfonate, Tween 20, Tween 60, Tween 80, castor oil polyoxyethylene ether, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, alkyl polyethylene glycol ether, alkylamine ether or carboxymethyl cellulose;

[0027] Surfactant B includes any one or a combination of at least two of Span 60, Span 80, betaine, dodecanol, cetyl alcohol, stearyl alcohol or polyethylene glycol.

[0028] Preferably, the disperse dye includes any one or a combination of multiple of C.I. Disperse Red 17, C.I. Disperse Red 7, Disperse Red FRL, Disperse Red CBN, Disperse Red F3BS, C.I. Disperse Orange 13, C.I. Disperse Orange 3, Disperse Orange R-SF, Disperse Orange SE-5RL, Disperse Orange SE-4RF, Disperse Orange F3R, Disperse Orange REL, C.I. Disperse Yellow 33, Disperse Yellow SE-4GL, Disperse Yellow 6GFS, Disperse Yellow C-5G, Disperse Yellow E-3GL, C.I. Disperse Blue 81, Disperse Blue CR-E, Disperse Blue ECO, Disperse Blue HSF, C.I. Disperse Violet 56, C.I. Disperse Violet 28, Disperse Violet CB, Disperse Violet HFRL, Disperse Violet S 3RL, MP Violet ADW, Disperse Brown S-2BL, Disperse Brown S3BL, Disperse Black 9, Disperse Black BL, Disperse Black EX-SF, Disperse Black ECO, Disperse Black ECT, Disperse Black RD-EK, Disperse Black DST, Disperse Black RXN-SF, Disperse Black EV-ST, Disperse Black RD-3G, Disperse Black SE-U, Disperse Black SRN, Disperse Black GI, Disperse Black CSN, Disperse Black LBT, Disperse Black MW-ECO or Disperse Black WF-GL.

[0029] Preferably, the boiling point of the diluent is ≥ 98 °C, such as 98 °C, 98.2 °C, 98.4 °C, 98.6 °C, 98.8 °C, 99 °C, 99.2 °C, 99.4 °C, 99.6 °C or 99.8 °C, etc.

[0030] Preferably, the difference between the solubility parameter of the diluent and the solubility parameter of the resin to be dyed is ≥ 3 (cal / cm 3 ) 1 / 2 , such as 3 (cal / cm 3 ) 1 / 2 , 3.5 (cal / cm 3 ) 1 / 2 , 4 (cal / cm 3 ) 1 / 2 , 4.5 (cal / cm 3 ) 1 / 2 , 5 (cal / cm 3 ) 1 / 2 , 5.5 (cal / cm 3 ) 1 / 2 , 6 (cal / cm 3 ) 1 / 2 , 6.5 (cal / cm 3 ) 1 / 2 , 7 (cal / cm 3 ) 1 / 2 , 7.5 (cal / cm 3 ) 1 / 2 , 8 (cal / cm 3 ) 1 / 2 , 8.5 (cal / cm 3 ) 1 / 2 , 9 (cal / cm 3 ) 1 / 2 , 9.5 (cal / cm 3 ) 1 / 2 or 10 (cal / cm 3 ) 1 / 2 etc.

[0031] Preferably, the diluent includes any one or a combination of at least two of deionized water, dimethyl silicone oil, ethylene glycol or dimethylformamide.

[0032] In a second aspect, the present invention provides a method for preparing the resin dye solution as described in the first aspect, and the preparation method includes the following steps:

[0033] (1) Mix the surfactant, the dyeing assistant and the diluent to obtain a mixed solution;

[0034] (2) Add disperse dyes to the mixed solution obtained in step (1) to obtain the resin dye solution.

[0035] Preferably, the maximum particle size of the mixed solution in step (1) ≤ 10 μm.

[0036] Preferably, the minimum particle size of the mixed solution in step (1) ≥ 0.1 μm.

[0037] Preferably, the method of mixing in step (1) is as follows: First, add a surfactant to a diluent and stir until completely dissolved, then add a dye assistant and disperse it fully, and then increase the stirring speed or homogenize to make the maximum particle size of the obtained mixed solution ≤ 10 μm and the minimum particle size ≥ 0.1 μm to complete the mixing.

[0038] In a third aspect, the present invention provides a method for dyeing a resin, and the dyeing method includes Method A or Method B;

[0039] Method A includes: Immerse the resin in the resin dye solution as described in the first aspect, take it out to obtain the dyed resin, and complete the dyeing of the resin;

[0040] Method B includes: Coat the resin dye solution as described in the first aspect on the surface of the resin to obtain the dyed resin, and complete the dyeing of the resin.

[0041] Preferably, the resin includes any one or a combination of at least two of polymethyl methacrylate resin, polystyrene resin, polycarbonate resin, poly-4-methylpentene resin, polyethylene terephthalate resin, polyethersulfone resin, polyurethane resin, polyolefin resin, styrene-(meth)acrylate copolymer resin, styrene-acrylonitrile copolymer resin, or epoxy resin.

[0042] Preferably, the impregnation time is 0.5 - 5 min, such as 0.5 min, 1 min, 1.5 min, 2 min, 2.5 min, 3 min, 3.5 min, 4 min, 4.5 min, or 5 min, etc.

[0043] Preferably, the impregnation temperature is 25 - 60 °C, such as 25 °C, 30 °C, 35 °C, 40 °C, 45 °C, 50 °C, 55 °C, or 60 °C, etc.

[0044] Preferably, the coating temperature is 25 - 60 °C, such as 25 °C, 30 °C, 35 °C, 40 °C, 45 °C, 50 °C, 55 °C, or 60 °C, etc.

[0045] In a fourth aspect, the present invention provides an application of the resin dye solution as described in the first aspect in the preparation of optical products.

[0046] Preferably, the optical article includes a lens, a light-shielding material for a lens assembly area, a windshield, a polarizer, an antireflection film, a filter element, or an optical waveguide element.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] The resin dye solution provided by the present invention includes a specific amount of a dye assistant, a surfactant, a disperse dye, and a diluent, and the average hydrophilic-lipophilic balance value of the surfactant is 8.5 to 12; through the reasonable combination of the above components and by limiting the average hydrophilic-lipophilic balance value of the surfactant within a specific range, the obtained resin dye solution has an excellent coloring effect on the resin, the resin after dyeing has high color fastness, is not easy to fade, has a low light transmittance, and at the same time, the resin dye solution can be reused multiple times, and an excellent dyeing effect on the resin can still be ensured after multiple reuse. Detailed implementation manners

[0049] The technical solution of the present invention will be further described below through specific implementation manners. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0050] Unless otherwise specified, the raw materials involved in the specific implementation manners of the present invention are conventional materials in the art and can be directly purchased through commercially available products; in particular, the information of some raw materials involved in the following specific implementation manners is as follows:

[0051] (1) Resin

[0052] Polystyrene sample: solubility parameter is 9.1 (cal / cm 3 ) 1 / 2 , purchased from Shanghai Secco;

[0053] Polycarbonate sample: solubility parameter is 10 (cal / cm 3 ) 1 / 2 , purchased from Covestro Shanghai;

[0054] Cyclic olefin polymer sample: solubility parameter is 8.7 (cal / cm 3 ) 1 / 2 , purchased from Topas Advanced Polymers;

[0055] Styrene-(meth)acrylate copolymer sample: solubility parameter is 9.3 (cal / cm 3 ) 1 / 2 , purchased from Chi Mei.

[0056] (2) Dye assistant

[0057] Methylcyclohexane: boiling point is 101 °C, solubility parameter is 8.0 (cal / cm3 ) 1 / 2 ;

[0058] Benzyl alcohol: boiling point is 205 °C, solubility parameter is 10.3 (cal / cm 3 ) 1 / 2 .

[0059] (3) Surfactant

[0060] Span 80: HLB value is 4.3;

[0061] Span 60: HLB value is 4.7;

[0062] Tween 60: HLB value is 14.9;

[0063] Alcohol polyoxyethylene ether AEO-9: HLB value is 13.5;

[0064] Castor oil polyoxyethylene ether: HLB value is 16;

[0065] Sodium dodecyl sulfonate: HLB value is 40;

[0066] Dodecanol: HLB value is 3.2;

[0067] Hexadecanol: HLB value is 6.3.

[0068] (4) Diluent

[0069] Dimethylformamide: boiling point is 153 °C, solubility parameter is 29 (cal / cm 3 ) 1 / 2 ;

[0070] Deionized water: boiling point is 100 °C, solubility parameter is 40 (cal / cm 3 ) 1 / 2 .

[0071] Examples 1 to 6

[0072] Examples 1 to 6 respectively provide a resin dye solution, and the respective components and the average hydrophilic-lipophilic balance value of the surfactant are recorded in Table 1;

[0073] And in Table 1, the dosage unit of each component is "parts by weight";

[0074] Table 1

[0075]

[0076] The preparation method of the resin dye solution provided in Examples 1 to 6 includes the following steps:

[0077] (1) Add a surfactant to a diluent and stir until completely dissolved; then, while stirring, slowly drop a mordant into the above solution and homogenize until the maximum particle size of the solution is <10 μm and the minimum particle size is >0.1 μm to obtain a mixed solution.

[0078] (2) Add a disperse dye to the mixed solution obtained in step (1) and stir well to obtain the resin dye solution.

[0079] Example 7

[0080] A resin dye solution, which is different from that of Example 1 in that in step (1) of the preparation method, homogenization is not carried out, and the maximum particle size of the obtained mixed solution is >10 μm, and other substances, dosages and steps are the same as those in Example 1.

[0081] Comparative Example 1

[0082] A resin dye solution, which is different from that of Example 1 in that an equal amount of Span 60 is used to replace fatty alcohol polyoxyethylene ether (AEO-9) to make the average HLB value of the surfactant 5, and other substances, dosages and preparation methods are the same as those in Example 1.

[0083] Comparative Example 2

[0084] A resin dye solution, which is different from that of Example 1 in that an equal amount of castor oil polyoxyethylene ether is used to replace Span 80 to make the average HLB value of the surfactant 12.3, and other substances, dosages and preparation methods are the same as those in Example 1.

[0085] Comparative Example 3

[0086] A resin dye solution, which is different from that of Example 1 in that the dosage of fatty alcohol polyoxyethylene ether (AEO-9) is 1 part by weight, and the dosage of Span 80 is 2 parts by weight, so that the average HLB value of the surfactant is 7.1, and other substances, dosages and preparation methods are the same as those in Example 1.

[0087] Comparative Example 4

[0088] A resin dye solution, which is different from that of Example 1 in that the dosage of fatty alcohol polyoxyethylene ether (AEO-9) is 3.5 parts by weight, the dosage of Span 80 is 0.25 part by weight, and the dosage of cetyl alcohol is 0.25 part by weight, so that the average HLB value of the surfactant is 12.5, and other substances, dosages and preparation methods are the same as those in Example 1.

[0089] Comparative Example 5

[0090] A resin dyeing solution, which is different from that of Example 1 in that the dosage of fatty alcohol polyoxyethylene ether (AEO-9) is 4 parts by weight, the dosage of Span 80 is 2 parts by weight, and the dosage of cetyl alcohol is 2 parts by weight, so that the average HLB value of the surfactant is 9.4. The other substances, dosages and preparation methods are the same as those of Example 1.

[0091] Comparative Example 6

[0092] A resin dyeing solution, which is different from that of Example 1 in that the dosage of fatty alcohol polyoxyethylene ether (AEO-9) is 1 part by weight, the dosage of Span 80 is 0.5 part by weight, and the dosage of cetyl alcohol is 0.5 part by weight, so that the average HLB value of the surfactant is 9.4. The other substances, dosages and preparation methods are the same as those of Example 1.

[0093] Comparative Example 7

[0094] A resin dyeing solution, which is different from that of Example 1 in that the dosage of deionized water is 90 parts by weight and the dosage of methylcyclohexane is 10 parts by weight. The other substances, dosages and preparation methods are the same as those of Example 1.

[0095] Comparative Example 8

[0096] A resin dyeing solution, which is different from that of Example 1 in that the dosage of deionized water is 30 parts by weight and the dosage of methylcyclohexane is 70 parts by weight. The other substances, dosages and preparation methods are the same as those of Example 1.

[0097] (1) Performance tests on the resin dyeing solutions provided in Example 1, Examples 5 to 7 and Comparative Examples 1 to 8

[0098] (1) Stability: The obtained resin dyeing solution was allowed to stand for 2 months, and it was observed whether it was stratified.

[0099] (2) Transmittance: It was measured by a YFANG HAM-200 haze meter, and the transmittance was tested under a standard C light source of 380 - 780 nm;

[0100] First, a polystyrene sample was molded into a disc with a diameter of 25 mm and a thickness of 3 mm, immersed in the resin dyeing solution at 55 °C for 1 min, taken out, washed, and a dyed polystyrene sample piece was obtained, and the used resin dyeing solution was collected to complete the first use of the resin dyeing solution;

[0101] Then, the collected resin dyeing solution was reused ten times according to the above steps, and the dyed polystyrene sample piece obtained after the tenth use was collected;

[0102] Finally, the transmittance of the dyed polystyrene sample piece obtained after the first use of the resin dyeing solution and the dyed polystyrene sample piece obtained after the tenth use was tested, and the results were summarized in Table 2;

[0103] Table 2

[0104]

[0105] In Table 1, " / " represents not tested.

[0106] It can be seen from the data in Table 2 that:

[0107] (1) The resin dyeing solutions provided in Example 1 and Examples 5 - 6 have excellent dyeing effects on the resin and can be reused at least 10 times, showing good reuse effects. The resin dyeing solution provided in Example 7 showed stratification after standing for 24 hours, with relatively poor stability.

[0108] (2) By comparing the data of Example 1 and Comparative Examples 1 - 4, it can be seen that when the average HLB value of the surfactant is not within the set range, the obtained resin dyeing solution is prone to stratification and cannot be used normally.

[0109] (3) By further comparing the data of Example 1 and Examples 5 - 6, it can also be seen that when the addition amount of the surfactant is too low, the obtained resin dyeing solution is prone to stratification, while when the addition amount of the surfactant is too high, it will cause the obtained resin solution to have too high viscosity, resulting in a decrease in dyeing density and an increase in the light transmittance of the resin after dyeing.

[0110] (4) Finally, by comparing the data of Example 1 and Comparative Examples 7 - 8, it can be seen that when the dosage of the diluent is too high, the light transmittance of the obtained dyed resin will be non - uniform after repeated use of the resin dyeing solution; while when the dosage of the co - dyeing agent is too high, although the dyeing effect and reuse effect of the obtained resin dyeing solution are both good, it will cause the resin after dyeing to deform, affecting normal use.

[0111] (II) Performance test of Example 2

[0112] (1) Light transmittance: Measured by a BYK - Gardner Haze - Gard Plus haze meter, and the light transmittance was tested under a standard C light source of 380 - 780 nm;

[0113] First, the polycarbonate sample was molded into a disc with a diameter of 25 mm and a thickness of 3 mm, immersed in the resin dyeing solution provided in Example 2 at 30 °C for 5 minutes, taken out, washed to obtain a dyed polycarbonate sample, and the used resin dyeing solution was collected to complete the first use of the resin dyeing solution;

[0114] Then, the resin dyeing solution was reused ten times according to the above steps, and the dyed polycarbonate sample obtained after the tenth use was collected;

[0115] Finally, the light transmittance of the dyed polycarbonate sample pieces obtained after the first use of the resin dye solution and the dyed polycarbonate sample pieces obtained after the tenth use was tested, and the results were summarized in Table 3;

[0116] Table 3

[0117]

[0118] (3) Performance test of Example 3

[0119] (1) Light transmittance: It was measured by a HAM-200 haze meter from Yuanfang, and the light transmittance was tested under a standard C light source of 380 - 780 nm;

[0120] First, the cycloolefin polymer sample was molded into a disc with a diameter of 25 mm and a thickness of 3 mm, immersed in the resin dye solution provided in Example 3 at 45 °C for 1.5 min, taken out and washed to obtain a dyed cycloolefin polymer sample piece, completing the first use of the resin dye solution;

[0121] Then, the resin dye solution was reused ten times, and the dyed cycloolefin polymer sample piece obtained after the tenth use was collected;

[0122] Finally, the light transmittance of the dyed cycloolefin polymer sample piece obtained after the first use of the resin dye solution and the dyed cycloolefin polymer sample piece obtained after the tenth use was tested, and the results were summarized in Table 4;

[0123] Table 4

[0124]

[0125] (4) Performance test of Example 4

[0126] (1) Light transmittance: It was measured by a HAM-200 haze meter from Yuanfang, and the light transmittance was tested under a standard C light source of 380 - 780 nm;

[0127] First, the styrene-(meth)acrylate copolymer sample was molded into a disc with a diameter of 25 mm and a thickness of 3 mm, immersed in the resin dye solution provided in Example 4 at 40 °C for 3 min, taken out and washed to obtain a dyed styrene-(meth)acrylate copolymer sample piece, completing the first use of the resin dye solution;

[0128] Then, the resin dye solution was reused ten times according to the above steps, and the dyed styrene-(meth)acrylate copolymer sample piece obtained after the tenth use was collected;

[0129] Finally, the light transmittance of the dyed styrene-(meth)acrylate copolymer sample obtained after the first use of the resin dye solution and the dyed styrene-(meth)acrylate copolymer sample obtained after the tenth use was tested, and the results were summarized in Table 5;

[0130] Table 5

[0131]

[0132] It can also be seen from the data in Tables 3 to 5 that:

[0133] The resin dye solutions provided in Examples 2 to 4 have excellent dyeing effects on the resin, and can be reused without adding any external additives and without any treatment, and the dyeing effects on the resin during repeated use are also very excellent.

[0134] The applicant declares that the present invention illustrates a resin dye solution and its preparation method and application through the above-mentioned examples, but the present invention is not limited to the above-mentioned examples, that is, it does not mean that the present invention must rely on the above-mentioned examples to be implemented. Those skilled in the art should understand that any improvement to the present invention, the equivalent substitution of each raw material of the product of the present invention, the addition of auxiliary components, the selection of specific methods, etc., all fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A resin dyeing solution, characterized in that, The resin dyeing solution comprises the following components by weight parts: Dyeing assistant: 20 - 50 weight parts; Surfactant: 2.5 - 7.5 weight parts; Disperse dye: 1.5 - 5 weight parts; Diluent: 50 - 80 weight parts; The average hydrophilic-lipophilic balance value of the surfactant is 8.5 - 12.

2. The resin dyeing solution according to claim 1, wherein The boiling point of the dyeing assistant ≥ 95 °C; Preferably, the difference between the solubility parameter of the dye assistant and the solubility parameter of the resin to be dyed is ≤ 2 (cal / cm 3 ) 1 / 2 ; Preferably, the dyeing assistant comprises any one or a combination of at least two of propylene glycol methyl ether, tert-butyl cellosolve, durene, xylene, mesitylene, methylcyclohexane, propylene glycol diacetate, propylene carbonate, triethylene glycol, ethylene glycol diacetate, glycerol or benzyl alcohol.

3. The resin dyeing solution according to claim 1 or 2, characterized in that, The surfactant comprises a combination of surfactant A and surfactant B; Surfactant A comprises any one or a combination of at least two of sodium dodecyl sulfonate, alkylbenzene sulfonate, Tween 20, Tween 60, Tween 80, castor oil polyoxyethylene ether, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, alkyl polyethylene glycol ether, alkylamine ether or carboxymethyl cellulose; Surfactant B comprises any one or a combination of at least two of Span 60, Span 80, betaine, dodecanol, cetyl alcohol, stearyl alcohol or polyethylene glycol.

4. The resin dyeing solution according to any one of claims 1 to 3, characterized in that, The disperse dye comprises any one or a combination of multiple of C.I. Disperse Red 17, C.I. Disperse Red 7, Disperse Red FRL, Disperse Red CBN, Disperse Red F3BS, C.I. Disperse Orange 13, C.I. Disperse Orange 3, Disperse Orange R-SF, Disperse Orange SE-5RL, Disperse Orange SE-4RF, Disperse Orange F3R, Disperse Orange REL, C.I. Disperse Yellow 33, Disperse Yellow SE-4GL, Disperse Yellow 6GFS, Disperse Yellow C-5G, Disperse Yellow E-3GL, C.I. Disperse Blue 81, Disperse Blue CR-E, Disperse Blue ECO, Disperse Blue HSF, C.I. Disperse Violet 56, C.I. Disperse Violet 28, Disperse Violet CB, Disperse Violet HFRL, Disperse Violet S-3RL, MP Violet ADW, Disperse Brown S-2BL, Disperse Brown S-3BL, Disperse Black 9, Disperse Black BL, Disperse Black EX-SF, Disperse Black ECO, Disperse Black ECT, Disperse Black RD-EK, Disperse Black DST, Disperse Black RXN-SF, Disperse Black EV-ST, Disperse Black RD-3G, Disperse Black SE-U, Disperse Black SRN, Disperse Black GI, Disperse Black CSN, Disperse Black LBT, Disperse Black MW-ECO or Disperse Black WF-GL.

5. The resin dyeing solution according to any one of claims 1 to 4, characterized in that, The boiling point of the diluent ≥ 98 °C; Preferably, the difference between the solubility parameter of the diluent and the solubility parameter of the resin to be dyed is ≥ 3 (cal / cm 3 ) 1 / 2 ; Preferably, the diluent comprises any one or a combination of at least two of deionized water, dimethyl silicone oil, ethylene glycol or dimethylformamide.

6. A method for preparing the resin dyeing solution according to any one of claims 1 to 5, characterized in that, The preparation method comprises the following steps: (1) Mix the surfactant, dyeing assistant and diluent to obtain a mixed solution; (2) Add the disperse dye to the mixed solution obtained in step (1) to obtain the resin dyeing solution.

7. The preparation method according to claim 6, characterized in that, The maximum particle size of the mixed solution in step (1) ≤ 10 μm.

8. A method for dyeing a resin, characterized in that, The dyeing method comprises Method A or Method B; The method A includes: immersing the resin in the resin dyeing solution according to any one of claims 1 to 5, taking it out, obtaining the dyed resin, and completing the dyeing of the resin; The method B includes: coating the resin surface with the resin dyeing solution according to any one of claims 1 to 5, obtaining the dyed resin, and completing the dyeing of the resin.

9. The dyeing method according to claim 8, wherein The resin includes any one or a combination of at least two of polymethyl methacrylate resin, polystyrene resin, polycarbonate resin, poly-4-methylpentene resin, polyethylene terephthalate resin, polyethersulfone resin, polyurethane resin, polyolefin resin, styrene-(meth)acrylate copolymer resin, styrene-acrylonitrile copolymer resin, or epoxy resin; Preferably, the impregnation time is 0.5 to 5 min; Preferably, the impregnation temperature is 25 to 60 °C; Preferably, the coating temperature is 25 to 60 °C.

10. Use of a resin dyeing solution according to any one of claims 1 to 4 in the preparation of an optical article; Preferably, the optical article includes any one of a lens, a windshield, a polarizing plate, a polarizing film, an interior lighting fixture, an antireflection film, an optical card, a grating disk, a filter element, a liquid crystal display element, or an optical waveguide element.

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