Environment-friendly black liquid photosensitive ink without 907 and 369 photosensitizer

Abstract

The application discloses an environment-friendly black liquid photosensitive ink without 907 and 369 photosensitizers, which is composed of the following components in parts by weight: epoxy propylene acid resin 30-50 parts, photosensitizer 205 3-4 parts, photosensitizer 360 6-7 parts, photoinitiator 184 2-4 parts, superfine silicon powder 5-10 parts, superfine barium sulfate 20-30 parts, liquid chelating agent 1-3 parts, modified bentonite 15-30 parts, and organic silicon defoaming agent 5-10 parts. The application introduces long-wave environment-friendly photosensitizers for the first time, changes the structural defects of the traditional black system using 369 and 907 high carcinogenic photosensitizers to only meet short-wave length and insufficient deep curing of the ink, strengthens the deep curing effect of the carbon black photosensitive ink, improves the solder mask bridge manufacturing capacity of the carbon black photosensitive ink from 4 mil to 2 mil, and realizes secondary development. The product is high in efficiency and environmental protection and high in economic benefits, fully meets the European Union standard, and is mainly supplied to the European Union market.

Description

Technical Field

[0001] The invention relates to the field of liquid photosensitive ink technology, and more specifically, to an environmentally friendly black liquid photosensitive ink that does not contain 907 photosensitizer. Background Technology

[0002] Liquid photosensitive ink is a special type of UV ink that allows for full-page printing without the need for printing plates. After the ink coating is photosensitive, cured, and developed, it can be etched, electroplated, or electrophoretically colored, making it suitable for small-batch, multi-variety, personalized, and high-precision graphic products. The preparation of liquid photosensitive ink requires a photoinitiator, and the industry currently commonly uses 907 photosensitizer as the photoinitiator. Its typical addition level is 3-5%, which exceeds the EU standard by more than 30,000 times (REACH limit of 1000 PPM). Since June 16, 2020, the latest EU REACH regulations have listed 907 and 369 photosensitizers as substances of key concern; therefore, currently, liquid photosensitive inks produced in the industry cannot be exported to the EU.

[0003] However, there are currently no liquid photosensitive ink products in the industry that can replace photosensitizers 907 and 369. Therefore, inventing an environmentally friendly black liquid photosensitive ink that does not contain photosensitizers 907 and 369 is key to overcoming EU export restrictions. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an environmentally friendly black liquid photosensitive ink that can solve the problems of decreased photosensitivity and insufficient deep curing of traditional photosensitizers in black photosensitive inks, resulting in a decline in product characteristics, and does not contain 907 and 369 photosensitizers.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An environmentally friendly black liquid photosensitive ink is composed of the following components in parts by weight:

[0007] 30-50 parts of epoxy acrylic resin

[0008] Photosensitizer 205, 3-4 parts

[0009] Photosensitizer 360, 6-7 parts

[0010] Photoinitiator 184 2-4 parts,

[0011] 5-10 parts of ultrafine silica powder

[0012] 20-30 parts of ultrafine barium sulfate

[0013] 1-3 parts of liquid hysteresis agent

[0014] 15-30 parts of modified bentonite,

[0015] 5-10 parts of silicone defoamer.

[0016] Preferably, in the above-mentioned environmentally friendly black liquid photosensitive ink, the photosensitizer 205 is 2,3,3-trimethyl-4,5-benzoindole.

[0017] Preferably, in the above-mentioned environmentally friendly black liquid photosensitive ink, the photosensitizer 360 is 2-hydroxy-2-methyl-1-[4-(tert-butyl)phenyl]-1-propanone.

[0018] Preferably, in the above-mentioned environmentally friendly black liquid photosensitive ink, the modified bentonite is bentonite activated with DPM and ethanol.

[0019] Preferably, in the above-mentioned environmentally friendly black liquid photosensitive ink, the liquid rheology modifier is the rheology modifier BYK-R 605 unsaturated polyester.

[0020] Preferably, in the aforementioned environmentally friendly black liquid photosensitive ink, the epoxy-acrylic acid resin has an acid value of 42-50. By adjusting the acid value, the reaction time between the resin and Na2CO3 or K2CO3 in the ink during the developing stage can be extended, avoiding a decrease in ink adhesion due to over-development.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This invention introduces a long-wavelength (395-405nm) environmentally friendly photosensitizer for the first time, changing the structural defect of traditional black ink systems that use highly carcinogenic photosensitizers such as 369 and 907, which can only meet short-wavelength requirements and result in insufficient deep curing of ink.

[0023] 2. This invention enhances the deep curing effect of carbon black photosensitive ink through the synergistic effect of the formulation, increasing the solder bridge fabrication capability of the carbon black photosensitive ink from 4mil to 2mil and supporting secondary development. While meeting customer requirements for ink blackness, it significantly reduces the manufacturing difficulty of the product, thereby achieving the goal of producing high-precision circuit boards using carbon black photosensitive ink.

[0024] 3. The product of this invention is highly efficient, environmentally friendly, and economically beneficial. It fully complies with EU standards and is primarily supplied to the EU market.

[0025] 4. This invention is the first to use environmentally friendly photosensitizers 205 and 360, improving the product's bridging properties from 5mil solder bridges in traditional inks to 2mil solder bridges without changing material costs; its acid resistance is improved from 10% dilute sulfuric acid at 25 degrees Celsius for 30 minutes to 10% dilute sulfuric acid at 40 degrees Celsius for 30 minutes. The new product has excellent heat resistance, chemical resistance, and weather resistance. It can simultaneously meet the requirements of various surface treatment processes such as lead-free tin spraying, immersion gold, immersion tin, immersion silver, and OSP. For the first time in the industry, it solves the problem that carbon black photosensitive inks cannot meet the requirements of long-term, high-temperature, and high-acid surface treatment processes such as immersion gold, immersion silver, and immersion tin, making carbon black photosensitive inks suitable for industries with high ink quality requirements, such as computer motherboards, mobile phone carriers, and various communication terminals. Detailed Implementation

[0026] Example 1: Preparation of black liquid photosensitive ink

[0027] Formula (parts by weight):

[0028] 30 parts (50) of epoxy acrylic resin

[0029] 3 parts of 2,3,3-trimethyl-4,5-benzoindole

[0030] 6 parts of 2-hydroxy-2-methyl-1-[4-(tert-butyl)phenyl]-1-propanone

[0031] Photoinitiator 184 2 parts,

[0032] 5 parts of ultrafine silica powder

[0033] 20 parts of ultrafine barium sulfate

[0034] One part of rheology modifier BYK-R 605 unsaturated polyester.

[0035] 15 parts of modified bentonite (bentonite activated with DPM and ethanol),

[0036] 5 parts of silicone defoamer.

[0037] Mix the components thoroughly to obtain black liquid photosensitive ink.

[0038] Example 2: Preparation of black liquid photosensitive ink

[0039] Formula (parts by weight):

[0040] 50 parts of epoxy acrylic resin (42),

[0041] 4 parts of 2,3,3-trimethyl-4,5-benzoindole

[0042] 7 parts of 2-hydroxy-2-methyl-1-[4-(tert-butyl)phenyl]-1-propanone

[0043] Photoinitiator 184 4 parts,

[0044] 10 parts of ultrafine silica powder

[0045] 30 parts of ultrafine barium sulfate

[0046] Three parts of BYK-R 605 unsaturated polyester rheology modifier.

[0047] 30 parts of modified bentonite (bentonite activated with DPM and ethanol),

[0048] 10 parts of silicone defoamer.

[0049] Mix the components thoroughly to obtain black liquid photosensitive ink.

[0050] Example 3: Preparation of black liquid photosensitive ink

[0051] Formula (parts by weight):

[0052] 40 parts of epoxy acrylic resin (acid value 45),

[0053] 4 parts of 2,3,3-trimethyl-4,5-benzoindole

[0054] 7 parts of 2-hydroxy-2-methyl-1-[4-(tert-butyl)phenyl]-1-propanone

[0055] Photoinitiator 184 3 parts,

[0056] 8 parts of ultrafine silica powder

[0057] 25 parts of ultrafine barium sulfate

[0058] Two parts of BYK-R 605 unsaturated polyester rheology modifier.

[0059] 20 parts of modified bentonite (bentonite activated with DPM and ethanol),

[0060] 8 parts of silicone defoamer.

[0061] Mix the components thoroughly to obtain black liquid photosensitive ink.

[0062] Example 4: Preparation of black liquid photosensitive ink

[0063] Formula (parts by weight):

[0064] 35 parts (45) of epoxy acrylic resin

[0065] 3 parts of 2,3,3-trimethyl-4,5-benzoindole

[0066] 6 parts of 2-hydroxy-2-methyl-1-[4-(tert-butyl)phenyl]-1-propanone

[0067] Photoinitiator 184 3 parts,

[0068] 7 parts of ultrafine silica powder

[0069] 23 parts of ultrafine barium sulfate,

[0070] Two parts of BYK-R 605 unsaturated polyester rheology modifier.

[0071] 25 parts of modified bentonite (bentonite activated with DPM and ethanol),

[0072] Six parts of silicone defoamer.

[0073] Mix the components thoroughly to obtain black liquid photosensitive ink.

[0074] Comparative Example 1:

[0075] Traditional photosensitizers 907 and 369 were used as photoinitiators, replacing photosensitizers 205 and 360 respectively, and the rest was the same as in Example 1.

[0076] Comparative Example 2:

[0077] Traditional photosensitizers 907 and 369 were used as photoinitiators, replacing photosensitizers 205 and 360 respectively, and the rest was the same as in Example 2.

[0078] The effect test experiment is shown in Table 1.

[0079] Table 1

[0080]

[0081]

[0082] As can be seen from Table 1, the present invention uses traditional photosensitizers 907 and 369 as photoinitiators, replacing photosensitizers 205 and 360 respectively, and its performance is superior.

Claims

1. An environmentally friendly black liquid photosensitive ink, characterized in that... It consists of the following components in parts by weight: 30-50 parts of epoxy acrylic resin 3-4 parts of 2,3,3-trimethyl-4,5-benzoindole 6-7 parts of 2-hydroxy-2-methyl-1-[4-(tert-butyl)phenyl]-1-propanone Photoinitiator 1842-4 parts, 5-10 parts of ultrafine silica powder 20-30 parts of ultrafine barium sulfate 1-3 parts liquid hysteresis agent 15-30 parts of modified bentonite, 5-10 parts of silicone defoamer.

2. The environmentally friendly black liquid photosensitive ink as described in claim 1, characterized in that, The modified bentonite is bentonite activated with DPM and ethanol.

3. The environmentally friendly black liquid photosensitive ink as described in claim 1, characterized in that, The acid value of the epoxy-propylene resin is 42-50.

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