Ink transparent to infrared light, process for its preparation and use

Abstract

The application discloses infrared light penetrating ink and a preparation method and application thereof. According to weight percentage, the infrared light penetrating ink comprises the following components: 60-70% resin, 0.63-0.72% black dye, 0.12-0.21% red dye, 0.2-0.7% water-based polyurethane dispersion, 1.0-2.0% curing agent and 28-40% water. Preferably, the black dye is carbon black; and the red dye is 1,2-dihydroxy-9,10-anthraquinone. The preparation method comprises the step of mixing the various raw materials. The infrared light penetrating ink can be used for pollution detection of glass or silicon wafer. Through control of the mass percentage of the black dye and the red dye, the application can realize stable low reflectivity and light transmittance in the visible light region, high light transmittance in the infrared light region and strong adhesion to glass and other substrates.

Description

TECHNICAL FIELD

[0001] The present application relates to an infrared light penetrating ink, a preparation method and application thereof. BACKGROUND

[0002] The infrared light penetrating ink has high transmittance in the infrared light region, and has low transmittance (T%) and low reflectance (R%) for light in the visible light region, that is, has high shielding and blackness for visible light. Generally, such ink also has good adhesion to substrates such as glass, and can form a relatively firm coating film on the substrate.

[0003] When the surface of a product such as glass or silicon wafer has less or special contaminants, it is usually difficult to detect by conventional microscopic techniques under visible light, and the infrared light penetrating ink is coated on the surface of the product, and then an infrared light source is used for irradiation. Since the ink is partially strong in infrared light penetration, and the contaminants are usually difficult to penetrate the infrared light, the presence or absence of contaminants on the surface of the product such as glass can be judged and detected accordingly.

[0004] However, the existing infrared light penetrating ink is not stable enough in low transmittance and low reflectance for visible light, and can have high transmittance or reflectance for visible light, resulting in low sensitivity and accuracy in contamination detection. SUMMARY

[0005] The present application solves the technical problems of the prior art, and provides an infrared light penetrating ink. The ink has stable low transmittance and low reflectance for visible light with a wavelength of 400-700 nm, and has high transmittance for infrared light, so that the sensitivity and accuracy are significantly improved in contamination detection.

[0006] To solve the above technical problems, the present application adopts the following technical solutions:

[0007] An infrared light penetrating ink, according to weight percentage, the infrared light penetrating ink comprises the following components: 60%-70% resin, 0.63%-0.72% black dye, 0.12%-0.21% red dye, 0.2%-0.7% water-based polyurethane dispersion, 1.0%-2.0% curing agent, 28%-40% water.

[0008] In some embodiments, according to weight percentage, the infrared light penetrating ink comprises the following components: 60%-68% resin, 0.63%-0.72% black dye, 0.15%-0.21% red dye, 0.3%-0.6% water-based polyurethane dispersion, 1.0%-1.8% curing agent, 30%-38% water.

[0009] In some embodiments, the infrared light penetrating ink comprises the following components in percentage by weight: 65-67% resin, 0.63-0.72% black dye, 0.18-0.21% red dye, 0.4-0.5% aqueous polyurethane dispersion, 1.0-1.5% curing agent, 30-35% water.

[0010] The existing infrared light penetrating ink is not stable enough in low transmittance and low reflectance of visible light, and can have high transmittance or reflectance of visible light, resulting in low sensitivity and low accuracy in pollution detection. The inventors have found that by adding black dye and red dye to the infrared light penetrating ink and controlling the specific mass percentage of the two in the infrared light penetrating ink, stable low transmittance and reflectance of visible light and stable high transmittance in the infrared light region can be achieved under the premise of ensuring the adhesion of the ink layer. The sensitivity and accuracy of the infrared light penetrating ink for detecting pollution are improved.

[0011] In some embodiments, the black dye is carbon black, the carbon black is an aggregate formed by aggregation of primary particles, and the primary particles are formed by primary particles of carbon black; the particle size of the primary particles is 10-50 nm; the average particle size of the primary particles is 100-150 nm, and the maximum particle size is 500 nm and the minimum particle size is 85 nm; the average particle size of the aggregate is 10-100 μm. The black dye modulated with carbon black has good stability, can maintain long-lasting colorfastness on the optical filter, and helps to improve the efficiency of detecting the optical filter and reduce errors in detection.

[0012] In some embodiments, the red dye is 1,2-dihydroxy-9,10-anthraquinone. The red dye modulated with anthraquinone type dye also has good stability and brightness, can maintain long-lasting colorfastness on the optical filter, and helps to improve the efficiency of detecting the optical filter and reduce errors in detection.

[0013] In some embodiments, the curing agent is an amine curing agent.

[0014] In some embodiments, the resin comprises aromatic polyester resin, epoxy resin and imidazole resin, and the mass ratio of the aromatic unsaturated polyester resin, epoxy resin and imidazole resin is 4-5:1.1-1.5:1.

[0015] In some embodiments, the aromatic polyester resin is polyethylene terephthalate; the epoxy resin is biphenyl type phenolic epoxy resin; and the imidazole resin is polybenzimidazole resin.

[0016] In some embodiments, the infrared light penetrating ink further comprises one or both of a defoaming agent and a leveling agent.

[0017] In some embodiments, the waterborne polyurethane dispersion has a solid content of 50% to 65%.

[0018] In some embodiments, the defoaming agent is selected from a polyether type defoaming agent or a mineral oil defoaming agent.

[0019] In some embodiments, the leveling agent is a silicone leveling agent.

[0020] In some embodiments, the infrared light penetrating ink comprises the following components in percentage by weight: 43% to 46% polyethylene terephthalate, 11.19% to 11.25% biphenyl type phenolic novolac epoxy resin, 5.81% to 12.75% polybenzimidazole resin 10%, 0.63% to 0.72% black dye, 0.12% to 0.21% red dye, 0.2% to 0.7% waterborne polyurethane dispersion, 1.0% to 2.0% curing agent, 0.3% to 0.7% defoaming agent, 0.3% to 0.7% leveling agent, and 28% to 40% water.

[0021] In some embodiments, the infrared light penetrating ink has an average light transmittance of 1.6% or less to light of a wavelength of 400-700 nm, an average reflectance of 1.2% or less to light of a wavelength of 400-700 nm, and an average light transmittance of 72% or more to light of a wavelength of 800-1200 nm.

[0022] In some embodiments, the infrared light penetrating ink has an average light transmittance of 1.0% or less to light of a wavelength of 400-700 nm, an average reflectance of 0.9% or less to light of a wavelength of 400-700 nm, and an average light transmittance of 73% or more to light of a wavelength of 800-1200 nm.

[0023] In some embodiments, the infrared light penetrating ink has an average light transmittance of 0.4% or less to light of a wavelength of 400-700 nm, an average reflectance of 0.3% or less to light of a wavelength of 400-700 nm, and an average light transmittance of 75% or more to light of a wavelength of 800-1200 nm.

[0024] The present application also provides a preparation method of the aforementioned infrared light penetrating ink, the preparation method comprising the step of mixing the various raw materials to obtain the infrared light penetrating ink.

[0025] In some embodiments, the preparation method comprises the following steps: 1) mixing black dye, epoxy resin, aqueous polyurethane dispersion and water to obtain a black ink; 2) mixing red dye, epoxy resin, aqueous polyurethane dispersion and water to obtain a red ink; 3) mixing aromatic polyester resin, epoxy resin, imidazole resin, the black ink, the red ink, curing agent and water to obtain the infrared light penetrating ink.

[0026] In some embodiments, one or both of defoaming agent and leveling agent are further added in step 3).

[0027] The present application also provides the use of the aforementioned infrared light penetrating ink for contamination detection of glass, silicon wafer or optical filter. In the detection use, the aforementioned infrared light penetrating ink is usually first coated on the surface of the glass, silicon wafer or optical filter to be detected and dried into a film, and then the object to be detected is placed in an optical detection instrument device using infrared light wavelength, which emits infrared light to the object to be detected, and the device further comprises a photosensitive coupling element that can receive infrared light penetrating through the object to be detected, and the degree of penetration of infrared light through the object to be detected is used to determine whether the object to be detected is contaminated. If the infrared light transmittance is very low, it means that the object to be detected is obviously contaminated, and if the infrared light transmittance is relatively high, almost the same as the transmittance of the ink, it means that the object to be detected is not contaminated.

[0028] Thanks to the implementation of the above technical solutions, the present application has the following advantages compared with the prior art:

[0029] By adding black dye and red dye to the infrared light penetrating ink and controlling the specific mass percentage of the two in the infrared light penetrating ink, the present application can ensure the adhesion of the ink layer while achieving stable low transmittance and reflectance of the infrared light penetrating ink in the visible light region and stable high transmittance in the infrared light region. The problem of not stable enough low transmittance and reflectance of the existing infrared light penetrating ink to visible light and the problem of high transmittance or reflectance of visible light are overcome. BRIEF DESCRIPTION OF DRAWINGS

[0030] Fig. 1 The transmittance curve of the infrared light penetrating ink of Example 1 to light of 400-700 nm;

[0031] Fig. 2 The transmittance curve of the infrared light penetrating ink of Example 1 to light of 800-1200 nm;

[0032] Fig. 3 The reflectance curve of the infrared light penetrating ink of Example 1 to light of 400-700 nm. DETAILED DESCRIPTION

[0033] The application will be further described in conjunction with the following examples, but the examples are not intended to limit the scope of the application.

[0034] The technical features of the following described examples can be combined in any manner. For the sake of brevity, not all possible combinations are described in the following examples, but it is understood that any combination of the technical features is within the scope of the present description.

[0035] The following described examples only express several embodiments of the present application, which are described in more detail and specifically, but it should not be understood as limiting the scope of the patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.

[0036] Example 1:

[0037] The present embodiment provides an infrared light penetrating ink, and the preparation process is as follows:

[0038] The black dye carbon black (aggregate formed by primary particle aggregation, the primary particle is formed by the primary particle of carbon black; the particle size of the primary particle is 10-50 nm; the average particle size of the primary particle is 100 nm, and the maximum particle size is 500 nm, and the minimum particle size is 85 nm; the average particle size of the aggregate is 50 μm), biphenyl type phenolic epoxy resin, water-based polyurethane dispersion (solid content 60%) and water are mixed to obtain a black ink;

[0039] The red dye 1,2-dihydroxy-9,10-anthraquinone, biphenyl type phenolic epoxy resin, water-based polyurethane dispersion (solid content 60%) and water are mixed to obtain a red ink;

[0040] The polyethylene terephthalate, biphenyl type phenolic epoxy resin, polybenzimidazole resin, the aforementioned black ink, the aforementioned red ink, amine curing agent, polyether type defoaming agent, silicone leveling agent, and water are mixed to obtain an infrared light penetrating ink.

[0041] The mass percentage of each component in the finally obtained infrared light penetrating ink is shown in the following Table 1.

[0042] The above infrared light penetrating ink is tested by using Agilent 6000i tester in the range of 400-700nm wavelength, and the average transmittance T%(400-700nm) and average reflectance R%(400-700nm) in the range of 400-700nm wavelength are calculated according to the software matched with the tester. The above infrared light penetrating ink is also tested in the range of 800-1200nm wavelength, and the average transmittance T%(800-1200nm) in the range of 800-1200nm wavelength is calculated. The adhesion of the above infrared light penetrating ink is tested by using ASTM D3359 standard, and the results are shown in Table 2 below. Figs. 1-3

[0043] Examples 2-3 and Comparative Examples 1-3

[0044] Examples 2-3 and Comparative Examples 1-3 also respectively provide an infrared light penetrating ink, and the preparation process is basically the same as that of Example 1, and the difference is only that the amount of each component in the infrared light penetrating ink is adjusted. The mass percentage of each component in the infrared light penetrating ink is shown in Table 1 below. The performance test results are shown in Table 2 below.

[0045] Table 1: Raw material amount of each example and comparative example

[0046]

[0047] Table 2: Performance results of each example and comparative example

[0048]

[0049] It can be seen that by controlling the specific mass percentage of black dye and red dye in the infrared light penetrating ink, the infrared light penetrating ink can have stable low reflectance and transmittance in the visible light region, high transmittance in the infrared light region, and strong adhesion to the glass substrate.

[0050] The above infrared light penetrating ink can be used to detect whether the surface of the glass, silicon wafer or optical filter is contaminated. The above examples are only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, the present application can be improved and modified, and these improvements and modifications also fall within the protection scope of the claims of the present application.​

Claims

1. An infrared light-transmitting ink, characterized in that: The infrared light-transmitting ink, by weight percentage, comprises the following components: 60%–70% resin, 0.63%–0.72% black dye, 0.12%–0.21% red dye, 0.2%–0.7% aqueous polyurethane dispersion, 1.0%–2.0% curing agent, and 28%–40% water, wherein the sum of the weight percentages of all components is 100%; the black dye is carbon black, which is an aggregate formed by primary particle aggregation, wherein the primary particles are formed from primary carbon black particles; the particle size of the primary particles is 10–50 nm; the average particle size of the primary particles is 100–150 nm, with a maximum particle size of 500 nm and a minimum particle size of 85 nm; the average particle size of the aggregate is 10–100 μm; and the red dye is 1,2-dihydroxy-9,10-anthraquinone. The resin includes aromatic polyester resin, epoxy resin and imidazole resin, and the mass ratio of the aromatic unsaturated polyester resin, epoxy resin and imidazole resin is 4~5:1.1~1.5:

1.

2. The infrared light-transmitting ink according to claim 1, characterized in that: The infrared light-transmitting ink, by weight percentage, consists of the following components: 60%~68% resin, 0.63%~0.72% black dye, 0.15%~0.21% red dye, 0.3%~0.6% waterborne polyurethane dispersion, 1.0%~1.8% curing agent, and 30%~38% water, and the sum of the weight percentages of all components is 100%.

3. The infrared light-transmitting ink according to claim 1, characterized in that: The infrared light-transmitting ink, by weight percentage, consists of the following components: 65%~67% resin, 0.63%~0.72% black dye, 0.18%~0.21% red dye, 0.4%~0.5% waterborne polyurethane dispersion, 1.0%~1.5% curing agent, and 30%~35% water, and the sum of the weight percentages of all components is 100%.

4. The infrared light-transmitting ink according to claim 1, characterized in that: The curing agent is an amine-based curing agent.

5. The infrared light-transmitting ink according to claim 1, characterized in that: The solid content of the aqueous polyurethane dispersion is 50%~65%.

6. The infrared light-transmitting ink according to claim 1, characterized in that: The aromatic polyester resin is polyethylene terephthalate; the epoxy resin is a biphenyl-type phenolic epoxy resin; and the imidazole resin is polybenzimidazole resin.

7. The infrared light-transmitting ink according to claim 1, characterized in that: The infrared light-transmitting ink also includes one or both of defoamers and leveling agents.

8. The infrared light-transmitting ink according to claim 7, characterized in that: The defoamer is selected from polyether-type defoamers or mineral oil defoamers.

9. The infrared light-transmitting ink according to claim 7, characterized in that: The leveling agent is an organosilicon leveling agent.

10. The infrared light-transmitting ink according to claim 1, characterized in that: The infrared light-transmitting ink, by weight percentage, comprises the following components: 43%–46% polyethylene terephthalate, 11.19%–11.25% biphenyl-type phenolic epoxy resin, 5.81%–12.75% polybenzimidazole resin, 0.63%–0.72% black dye, 0.12%–0.21% red dye, 0.2%–0.7% waterborne polyurethane dispersion, 1.0%–2.0% curing agent, 0.3%–0.7% defoamer, 0.3%–0.7% leveling agent, and 28%–40% water, wherein the sum of the weight percentages of all components is 100%.

11. The infrared light-transmitting ink according to claim 1, characterized in that: The infrared light-transmitting ink has an average transmittance of less than 1.6% for light with a wavelength of 400-700nm, an average reflectance of less than 1.2% for light with a wavelength of 400-700nm, and an average transmittance of more than 72% for light with a wavelength of 800-1200nm.

12. A method for preparing the infrared light-transmitting ink according to any one of claims 1-11, characterized in that: The preparation method includes the step of mixing various raw materials to obtain the infrared light-transmitting ink.

13. The use of the infrared light-transmitting ink as described in any one of claims 1 to 11 for the detection of contamination in glass, silicon wafers or filters.

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