Silica gel for digital printing and preparation method and application thereof

Abstract

The application provides a silica gel for digital printing and a preparation method and application thereof. The silica gel for digital printing is composed of component A and component B. The component A comprises vinyl silicone oil, end-vinyl polymethyl trifluoropropyl siloxane, vinyl dimethyl fluorosilane, fumed silica, a Pt catalyst and nano color paste. The component B comprises hydrogen-containing silicone oil, an inhibitor and nano color paste. By adding end-vinyl polymethyl trifluoropropyl siloxane and vinyl dimethyl fluorosilane with specific proportions into the silica gel for digital printing, the flowability, operable time and high-precision printing of the silica gel for digital printing during digital printing are improved.

Description

Technical Field

[0001] This invention belongs to the field of silicone technology, and particularly relates to a silicone for digital printing, its preparation method, and its application. Background Technology

[0002] Digital printing technology, with its high precision, high efficiency, and personalized customization capabilities, is gradually becoming the mainstream technology in the modern printing industry. It utilizes digital information to directly print images or text onto various media, eliminating the plate-making step required in traditional printing processes, thus greatly improving the flexibility and efficiency of printing. However, the performance of digital printing technology largely depends on the printing ink used.

[0003] Most mainstream digital printing inks on the market are water-based or solvent-based, which have certain limitations in specific applications. For example, they perform poorly in terms of abrasion resistance, weather resistance, and chemical stability, especially in outdoor or industrial environments, where their performance often fails to meet the demands of long-term use. Furthermore, traditional digital printing inks may have insufficient adhesion when printed on certain special materials, leading to images that are prone to peeling or fading.

[0004] Silicone is a high-molecular-weight organic polymer with excellent physical properties and chemical stability. It possesses excellent flexibility, abrasion resistance, high-temperature resistance, and chemical corrosion resistance, while also exhibiting good air permeability, washability, and relatively good colorfastness. These properties make silicone widely used in many fields, especially in applications requiring high elasticity and durability. However, traditional silicone materials are not suitable for direct use in digital printing due to their poor flowability and short working time.

[0005] Therefore, in order to address the above problems, there is an urgent need to find a type of silicone for digital printing that has good fluidity at room temperature, long working time, and can achieve high-precision printing, as well as its preparation method. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, one object of the present invention is to provide a silicone for digital printing, its preparation method and application, which aims to solve the technical problem that current printing silicone cannot meet the requirements of good fluidity at room temperature, long working time and high-precision printing.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A type of silicone for digital printing, comprising component A and component B, wherein each component includes the following components and their mass fractions:

[0009] Component A:

[0010] Vinyl silicone oil: 100 parts

[0011] Vinyl-terminated polymethyltrifluoropropylsiloxane: 25-30 parts

[0012] Vinyl dimethyl fluorosilane: 10-15 parts

[0013] 3-5 parts of fumed silica

[0014] Pt catalyst: 3-5 parts

[0015] Nano-grade color paste: 1-3 parts;

[0016] The raw materials and their weight proportions for component B are as follows:

[0017] 100 parts of hydrogen-containing silicone oil

[0018] Inhibitor: 5-8 parts

[0019] Nano-grade color paste: 1-3 parts.

[0020] The vinyl silicone oil is vinyl-terminated polydimethylsiloxane, with a vinyl content of 0.06-0.15 mmol / g and a viscosity of 500-2000 mPa·s;

[0021] The vinyl-terminated polymethyltrifluoropropylsiloxane is a vinyl-terminated trifluoropropylmethyl-dimethyl copolysiloxane (C 12 H 25 F3O2Si3);

[0022] The mass ratio of the terminal vinyl polymethyltrifluoropropylsiloxane to vinyl dimethylfluorosilane is (1.5-3):1;

[0023] The Pt catalyst is a Pt catalyst coordinated with methylvinylsiloxane, and the Pt content of the Pt catalyst is 3000 ppm.

[0024] The hydrogen content of the hydrogen-containing silicone oil is 0.1-0.2 wt%.

[0025] The inhibitor is selected from one or more of methylbutynol, ethynylcyclohexanol, phenylbutynol, and propylbutynol.

[0026] The nanoscale color paste is selected from one or more of cyan, magenta, yellow, or black color pastes.

[0027] The mass ratio of component A to component B is 10:(2-5).

[0028] A second objective of this invention is to provide a method for preparing silicone for digital printing, comprising the following steps:

[0029] (1) Preparation of component A: Add the prescribed amount of vinyl silicone oil, vinyl-terminated polymethyltrifluoropropylsiloxane and vinyl dimethylfluorosilane to a kneader, start stirring, add the prescribed amount of fumed silica in three batches, heat to 150-170℃ and vacuum for 2-3 hours, then add the prescribed amount of nano-grade color paste, vacuum for 2-3 hours at 150-170℃, and obtain a paste after cooling; take the above paste and the prescribed amount of Pt catalyst and add them to a planetary mixer and stir for 1-2 hours until evenly dispersed, vacuum, to obtain component A;

[0030] (2) Preparation of component B: Add the prescribed amount of hydrogen-containing silicone oil, inhibitor and nano-sized color paste to a planetary mixer and stir for 1-2 hours until evenly dispersed. Vacuum is then applied to obtain component B.

[0031] (3) Mix components A and B at a mass ratio of 10:(2-5) at room temperature to obtain silicone for digital printing.

[0032] The third objective of this invention is to provide a method for applying silicone for digital printing, the method comprising the following steps:

[0033] (1) The silicone for digital printing, which is prepared in a certain proportion, is extracted by a liquid glue feeder and then automatically mixed evenly by a static mixer. The silicone coating is then digitally printed by a digital printer.

[0034] (2) The digital printing silicone coating is baked and cured at 120-130℃ for 3-5 minutes to obtain the silicone product for digital printing.

[0035] The fourth objective of this invention is to provide an application of silicone for digital printing in improving the fluidity of silicone for digital printing, extending the working time, and improving the precision of digital printing coatings.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] (1) The inventors have creatively added vinyl-terminated polymethyltrifluoropropylsiloxane and vinyldimethylfluorosilane to the silicone for digital printing. On the one hand, the unique structure of fluorinated silicone oil and small molecule fluorinated silane, as well as the low surface energy of the fluorinated groups therein, improve the fluidity, working time and accuracy of the silicone for digital printing. On the other hand, the unique structure and the fact that the end group is vinyl can further crosslink with hydrogen-containing silicone oil, adjust the crosslinking structure of the single vinyl silicone oil and the hydrogen-containing silicone oil, and improve the fluidity, working time and accuracy of the silicone as a whole.

[0038] (2) The inventors have creatively discovered that the vinyl polymethyl trifluoropropylsiloxane and vinyl dimethyl fluorosilane in the middle of the silicone for digital printing have a synergistic effect. Furthermore, the inventors have further improved the fluidity, working time and accuracy of the silicone for digital printing by adjusting the specific ratio of the two. Detailed Implementation

[0039] Unless otherwise specified, the raw materials and equipment used in this invention are all commonly used in the field; unless otherwise specified, the methods used in this invention are all conventional methods in the field.

[0040] Unless otherwise specified, the terms used in this specification have the same meaning as those commonly understood by those skilled in the art; however, in the event of any conflict, the definitions in this specification shall prevail.

[0041] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0042] The following are some of the raw material types or specifications used in the examples:

[0043] Vinyl silicone oil: Keqi Polymer Material V-500, viscosity 500 mPa·s, vinyl content 0.15 mmol / g;

[0044] Vinyl-terminated polymethyltrifluoropropylsiloxane: Vinyl fluorosilicone oil 805 from Hubei Xinyuhong Biomedical Technology Co., Ltd., with a vinyl content of 1.2-1.5%;

[0045] Vinyl dimethyl fluorosilane: Shanghai Shiyang Chemical Co., Ltd.

[0046] Hydrogen-containing silicone oil: Keqi Polymer Material D-15, viscosity 15 mPa·s, hydrogen content 0.12 wt%;

[0047] Fumed silica: Cabot CAB-O- DURAMOLD TM 2150, with a specific surface area of ​​244-277 m² / g;

[0048] Inhibitor: Ethynylcyclohexanol, Inda Chemical.

[0049] Example 1

[0050] A type of silicone for digital printing, composed of component A and component B, is described below in terms of formulation (parts by weight) and preparation process:

[0051] Component A:

[0052] Vinyl silicone oil: 100 parts

[0053] Vinyl-terminated polymethyltrifluoropropylsiloxane: 30 parts

[0054] Vinyl dimethyl fluorosilane: 10 parts

[0055] 5 parts of fumed silica

[0056] Pt catalyst: 3 parts

[0057] Nano-grade black pigment: 1 part;

[0058] The raw materials and their weight proportions for component B are as follows:

[0059] 100 parts of hydrogen-containing silicone oil

[0060] Inhibitor: 6 parts

[0061] Nano-grade black pigment: 1 part.

[0062] (1) Preparation of component A: Add the prescribed amount of vinyl silicone oil, vinyl-terminated polymethyltrifluoropropylsiloxane and vinyl dimethylfluorosilane to a kneader, start stirring, add the prescribed amount of fumed silica in three batches, heat to 150°C and vacuum for 3 hours, then add the prescribed amount of nano-sized black pigment paste and vacuum for 2 hours at 150°C. After cooling, a paste is obtained. Take the above paste and the prescribed amount of Pt catalyst and add them to a planetary mixer and stir for 2 hours until evenly dispersed. Vacuum is then applied to obtain component A.

[0063] (2) Preparation of component B: Add the prescribed amount of hydrogen-containing silicone oil, inhibitor and nano-sized black pigment to a planetary mixer and stir for 1 hour until evenly dispersed. Vacuum is then applied to obtain component B.

[0064] (3) Mix components A and B at a mass ratio of 10:3 at room temperature to obtain silicone for digital printing.

[0065] Example 2

[0066] A type of silicone for digital printing, composed of component A and component B, is described below in terms of formulation (parts by weight) and preparation process:

[0067] Component A:

[0068] Vinyl silicone oil: 100 parts

[0069] Vinyl-terminated polymethyltrifluoropropylsiloxane: 28 parts

[0070] Vinyl dimethyl fluorosilane: 12 parts

[0071] 5 parts of fumed silica

[0072] Pt catalyst: 3 parts

[0073] Nano-grade black pigment: 1 part;

[0074] The raw materials and their weight proportions for component B are as follows:

[0075] 100 parts of hydrogen-containing silicone oil

[0076] Inhibitor: 6 parts

[0077] Nano-grade black pigment: 1 part.

[0078] (1) Preparation of component A: Add the prescribed amount of vinyl silicone oil, vinyl-terminated polymethyltrifluoropropylsiloxane and vinyl dimethylfluorosilane to a kneader, start stirring, add the prescribed amount of fumed silica in three batches, heat to 150°C and vacuum for 3 hours, then add the prescribed amount of nano-sized black pigment paste and vacuum for 2 hours at 150°C. After cooling, a paste is obtained. Take the above paste and the prescribed amount of Pt catalyst and add them to a planetary mixer and stir for 2 hours until evenly dispersed. Vacuum is then applied to obtain component A.

[0079] (2) Preparation of component B: Add the prescribed amount of hydrogen-containing silicone oil, inhibitor and nano-sized black pigment to a planetary mixer and stir for 1 hour until evenly dispersed. Vacuum is then applied to obtain component B.

[0080] (3) Mix components A and B at a mass ratio of 10:3 at room temperature to obtain silicone for digital printing.

[0081] Example 3

[0082] A type of silicone for digital printing, composed of component A and component B, is described below in terms of formulation (parts by weight) and preparation process:

[0083] Component A:

[0084] Vinyl silicone oil: 100 parts

[0085] Vinyl-terminated polymethyltrifluoropropylsiloxane: 25 parts

[0086] Vinyl dimethyl fluorosilane: 15 parts

[0087] 5 parts of fumed silica

[0088] Pt catalyst: 3 parts

[0089] Nano-grade black pigment: 1 part;

[0090] The raw materials and their weight proportions for component B are as follows:

[0091] 100 parts of hydrogen-containing silicone oil

[0092] Inhibitor: 6 parts

[0093] Nano-grade black pigment: 1 part.

[0094] (1) Preparation of component A: Add the prescribed amount of vinyl silicone oil, vinyl-terminated polymethyltrifluoropropylsiloxane and vinyl dimethylfluorosilane to a kneader, start stirring, add the prescribed amount of fumed silica in three batches, heat to 150°C and vacuum for 3 hours, then add the prescribed amount of nano-sized black pigment paste and vacuum for 2 hours at 150°C. After cooling, a paste is obtained. Take the above paste and the prescribed amount of Pt catalyst and add them to a planetary mixer and stir for 2 hours until evenly dispersed. Vacuum is then applied to obtain component A.

[0095] (2) Preparation of component B: Add the prescribed amount of hydrogen-containing silicone oil, inhibitor and nano-sized black pigment to a planetary mixer and stir for 1 hour until evenly dispersed. Vacuum is then applied to obtain component B.

[0096] (3) Mix components A and B at a mass ratio of 10:3 at room temperature to obtain silicone for digital printing.

[0097] Example 4

[0098] A type of silicone for digital printing, composed of component A and component B, is described below in terms of formulation (parts by weight) and preparation process:

[0099] Component A:

[0100] Vinyl silicone oil: 100 parts

[0101] Vinyl-terminated polymethyltrifluoropropylsiloxane: 28 parts

[0102] Vinyl dimethyl fluorosilane: 12 parts

[0103] 3 parts of fumed silica

[0104] Pt catalyst: 3 parts

[0105] Nano-grade black pigment: 1 part;

[0106] The raw materials and their weight proportions for component B are as follows:

[0107] 100 parts of hydrogen-containing silicone oil

[0108] Inhibitor: 6 parts

[0109] Nano-grade black pigment: 1 part.

[0110] (1) Preparation of component A: Add the prescribed amount of vinyl silicone oil, vinyl-terminated polymethyltrifluoropropylsiloxane and vinyl dimethylfluorosilane to a kneader, start stirring, add the prescribed amount of fumed silica in three batches, heat to 150°C and vacuum for 3 hours, then add the prescribed amount of nano-sized black pigment paste and vacuum for 2 hours at 150°C. After cooling, a paste is obtained. Take the above paste and the prescribed amount of Pt catalyst and add them to a planetary mixer and stir for 2 hours until evenly dispersed. Vacuum is then applied to obtain component A.

[0111] (2) Preparation of component B: Add the prescribed amount of hydrogen-containing silicone oil, inhibitor and nano-sized black pigment to a planetary mixer and stir for 1 hour until evenly dispersed. Vacuum is then applied to obtain component B.

[0112] (3) Mix components A and B at a mass ratio of 10:3 at room temperature to obtain silicone for digital printing.

[0113] Example 5

[0114] A type of silicone for digital printing, composed of component A and component B, is described below in terms of formulation (parts by weight) and preparation process:

[0115] Component A:

[0116] Vinyl silicone oil: 100 parts

[0117] Vinyl-terminated polymethyltrifluoropropylsiloxane: 28 parts

[0118] Vinyl dimethyl fluorosilane: 12 parts

[0119] 5 parts of fumed silica

[0120] Pt catalyst: 3 parts

[0121] Nano-grade black pigment: 1 part;

[0122] The raw materials and their weight proportions for component B are as follows:

[0123] 100 parts of hydrogen-containing silicone oil

[0124] Inhibitor: 5 parts

[0125] Nano-grade black pigment: 1 part.

[0126] (1) Preparation of component A: Add the prescribed amount of vinyl silicone oil, vinyl-terminated polymethyltrifluoropropylsiloxane and vinyl dimethylfluorosilane to a kneader, start stirring, add the prescribed amount of fumed silica in three batches, heat to 150°C and vacuum for 3 hours, then add the prescribed amount of nano-sized black pigment paste and vacuum for 2 hours at 150°C. After cooling, a paste is obtained. Take the above paste and the prescribed amount of Pt catalyst and add them to a planetary mixer and stir for 2 hours until evenly dispersed. Vacuum is then applied to obtain component A.

[0127] (2) Preparation of component B: Add the prescribed amount of hydrogen-containing silicone oil, inhibitor and nano-sized black pigment to a planetary mixer and stir for 1 hour until evenly dispersed. Vacuum is then applied to obtain component B.

[0128] (3) Mix components A and B at a mass ratio of 10:3 at room temperature to obtain silicone for digital printing.

[0129] Example 6

[0130] A type of silicone for digital printing, composed of component A and component B, is described below in terms of formulation (parts by weight) and preparation process:

[0131] Component A:

[0132] Vinyl silicone oil: 100 parts

[0133] Vinyl-terminated polymethyltrifluoropropylsiloxane: 28 parts

[0134] Vinyl dimethyl fluorosilane: 12 parts

[0135] 5 parts of fumed silica

[0136] Pt catalyst: 5 parts

[0137] Nano-grade black pigment: 1 part;

[0138] The raw materials and their weight proportions for component B are as follows:

[0139] 100 parts of hydrogen-containing silicone oil

[0140] Inhibitor: 6 parts

[0141] Nano-grade black pigment: 1 part.

[0142] (1) Preparation of component A: Add the prescribed amount of vinyl silicone oil, vinyl-terminated polymethyltrifluoropropylsiloxane and vinyl dimethylfluorosilane to a kneader, start stirring, add the prescribed amount of fumed silica in three batches, heat to 150°C and vacuum for 3 hours, then add the prescribed amount of nano-sized black pigment paste and vacuum for 2 hours at 150°C. After cooling, a paste is obtained. Take the above paste and the prescribed amount of Pt catalyst and add them to a planetary mixer and stir for 2 hours until evenly dispersed. Vacuum is then applied to obtain component A.

[0143] (2) Preparation of component B: Add the prescribed amount of hydrogen-containing silicone oil, inhibitor and nano-sized black pigment to a planetary mixer and stir for 1 hour until evenly dispersed. Vacuum is then applied to obtain component B.

[0144] (3) Mix components A and B at a mass ratio of 10:3 at room temperature to obtain silicone for digital printing.

[0145] Comparative Example 1

[0146] A type of silicone for digital printing, composed of component A and component B, is described below in terms of formulation (parts by weight) and preparation process:

[0147] Component A:

[0148] Vinyl silicone oil: 100 parts

[0149] 5 parts of fumed silica

[0150] Pt catalyst: 3 parts

[0151] Nano-grade black pigment: 1 part;

[0152] The raw materials and their weight proportions for component B are as follows:

[0153] 100 parts of hydrogen-containing silicone oil

[0154] Inhibitor: 6 parts

[0155] Nano-grade black pigment: 1 part.

[0156] (1) Preparation of component A: Add the prescribed amount of vinyl silicone oil to a kneader, start stirring, add the prescribed amount of fumed silica in three batches, heat to 150°C and vacuum for 3 hours, then add the prescribed amount of nano-sized black pigment paste and vacuum for 2 hours at 150°C. After cooling, a paste is obtained. Take the above paste and the prescribed amount of Pt catalyst and add them to a planetary mixer and stir for 2 hours until evenly dispersed. Vacuum is then applied to obtain component A.

[0157] (2) Preparation of component B: Add the prescribed amount of hydrogen-containing silicone oil, inhibitor and nano-sized black pigment to a planetary mixer and stir for 1 hour until evenly dispersed. Vacuum is then applied to obtain component B.

[0158] (3) Mix components A and B at a mass ratio of 10:3 at room temperature to obtain silicone for digital printing.

[0159] Comparative Example 2

[0160] A type of silicone for digital printing, composed of component A and component B, is described below in terms of formulation (parts by weight) and preparation process:

[0161] Component A:

[0162] Vinyl silicone oil: 100 parts

[0163] Vinyl-terminated polymethyltrifluoropropylsiloxane: 40 parts

[0164] 5 parts of fumed silica

[0165] Pt catalyst: 3 parts

[0166] Nano-grade black pigment: 1 part;

[0167] The raw materials and their weight proportions for component B are as follows:

[0168] 100 parts of hydrogen-containing silicone oil

[0169] Inhibitor: 6 parts

[0170] Nano-grade black pigment: 1 part.

[0171] (1) Preparation of component A: Add the prescribed amount of vinyl silicone oil and vinyl-terminated polymethyltrifluoropropylsiloxane to a kneader, start stirring, add the prescribed amount of fumed silica in three batches, heat to 150°C and vacuum for 3 hours, then add the prescribed amount of nano-sized black pigment paste and vacuum for 2 hours at 150°C. After cooling, a paste is obtained. Take the above paste and the prescribed amount of Pt catalyst and add them to a planetary mixer and stir for 2 hours until evenly dispersed. Vacuum is then applied to obtain component A.

[0172] (2) Preparation of component B: Add the prescribed amount of hydrogen-containing silicone oil, inhibitor and nano-sized black pigment to a planetary mixer and stir for 1 hour until evenly dispersed. Vacuum is then applied to obtain component B.

[0173] (3) Mix components A and B at a mass ratio of 10:3 at room temperature to obtain silicone for digital printing.

[0174] Comparative Example 3

[0175] A type of silicone for digital printing, composed of component A and component B, is described below in terms of formulation (parts by weight) and preparation process:

[0176] Component A:

[0177] Vinyl silicone oil: 100 parts

[0178] Vinyl dimethyl fluorosilane: 40 parts

[0179] 5 parts of fumed silica

[0180] Pt catalyst: 3 parts

[0181] Nano-grade black pigment: 1 part;

[0182] The raw materials and their weight proportions for component B are as follows:

[0183] 100 parts of hydrogen-containing silicone oil

[0184] Inhibitor: 6 parts

[0185] Nano-grade black pigment: 1 part.

[0186] (1) Preparation of component A: Add the prescribed amount of vinyl silicone oil and vinyl dimethyl fluorosilane to a kneader, start stirring, add the prescribed amount of fumed silica in three batches, heat to 150°C and vacuum for 3 hours, then add the prescribed amount of nano-sized black pigment paste and vacuum for 2 hours at 150°C. After cooling, a paste is obtained. Take the above paste and the prescribed amount of Pt catalyst and add them to a planetary mixer and stir for 2 hours until evenly dispersed. Vacuum is then applied to obtain component A.

[0187] (2) Preparation of component B: Add the prescribed amount of hydrogen-containing silicone oil, inhibitor and nano-sized black pigment to a planetary mixer and stir for 1 hour until evenly dispersed. Vacuum is then applied to obtain component B.

[0188] (3) Mix components A and B at a mass ratio of 10:3 at room temperature to obtain silicone for digital printing.

[0189] Comparative Example 4

[0190] A type of silicone for digital printing, composed of component A and component B, is described below in terms of formulation (parts by weight) and preparation process:

[0191] Component A:

[0192] Vinyl silicone oil: 100 parts

[0193] Vinyl-terminated polymethyltrifluoropropylsiloxane: 20 parts

[0194] Vinyl dimethyl fluorosilane: 20 parts

[0195] 5 parts of fumed silica

[0196] Pt catalyst: 3 parts

[0197] Nano-grade black pigment: 1 part;

[0198] The raw materials and their weight proportions for component B are as follows:

[0199] 100 parts of hydrogen-containing silicone oil

[0200] Inhibitor: 6 parts

[0201] Nano-grade black pigment: 1 part.

[0202] (1) Preparation of component A: Add the prescribed amount of vinyl silicone oil, vinyl-terminated polymethyltrifluoropropylsiloxane and vinyl dimethylfluorosilane to a kneader, start stirring, add the prescribed amount of fumed silica in three batches, heat to 150°C and vacuum for 3 hours, then add the prescribed amount of nano-sized black pigment paste and vacuum for 2 hours at 150°C. After cooling, a paste is obtained. Take the above paste and the prescribed amount of Pt catalyst and add them to a planetary mixer and stir for 2 hours until evenly dispersed. Vacuum is then applied to obtain component A.

[0203] (2) Preparation of component B: Add the prescribed amount of hydrogen-containing silicone oil, inhibitor and nano-sized black pigment to a planetary mixer and stir for 1 hour until evenly dispersed. Vacuum is then applied to obtain component B.

[0204] (3) Mix components A and B at a mass ratio of 10:3 at room temperature to obtain silicone for digital printing.

[0205] Comparative Example 5

[0206] A type of silicone for digital printing, composed of component A and component B, is described below in terms of formulation (parts by weight) and preparation process:

[0207] Component A:

[0208] Vinyl silicone oil: 100 parts

[0209] Vinyl-terminated polymethyltrifluoropropylsiloxane: 32 parts

[0210] Vinyl dimethyl fluorosilane: 8 parts

[0211] 5 parts of fumed silica

[0212] Pt catalyst: 3 parts

[0213] Nano-grade black pigment: 1 part;

[0214] The raw materials and their weight proportions for component B are as follows:

[0215] 100 parts of hydrogen-containing silicone oil

[0216] Inhibitor: 6 parts

[0217] Nano-grade black pigment: 1 part.

[0218] (1) Preparation of component A: Add the prescribed amount of vinyl silicone oil, vinyl-terminated polymethyltrifluoropropylsiloxane and vinyl dimethylfluorosilane to a kneader, start stirring, add the prescribed amount of fumed silica in three batches, heat to 150°C and vacuum for 3 hours, then add the prescribed amount of nano-sized black pigment paste and vacuum for 2 hours at 150°C. After cooling, a paste is obtained. Take the above paste and the prescribed amount of Pt catalyst and add them to a planetary mixer and stir for 2 hours until evenly dispersed. Vacuum is then applied to obtain component A.

[0219] (2) Preparation of component B: Add the prescribed amount of hydrogen-containing silicone oil, inhibitor and nano-sized black pigment to a planetary mixer and stir for 1 hour until evenly dispersed. Vacuum is then applied to obtain component B.

[0220] (3) Mix components A and B at a mass ratio of 10:3 at room temperature to obtain silicone for digital printing.

[0221] Sample preparation and performance testing:

[0222] The configured silicone for digital printing in Examples 1-6 and Comparative Examples 1-5 were subjected to the following performance tests.

[0223] Operable time test: Place the freshly prepared digital printing silicone of the examples and comparative examples in a 50°C oven and observe it every half hour, recording the time when the viscosity suddenly increases or the glue becomes dead.

[0224] Flow performance test (viscosity test): room temperature, rotational viscometer;

[0225] Accuracy test (resolution test): A digital printer was used and the USAF1951 standard resolution test board was used for testing. After printing, the paper was baked at 130℃ for 3 minutes and the minimum line width that could be clearly distinguished was recorded.

[0226] The performance of each example 1-6 is shown in Table 1.

[0227] Table 1

[0228]

[0229] The performance of Comparative Examples 1-5 is shown in Table 2.

[0230] Table 2

[0231]

[0232] Comparing Examples 1-6 and Comparative Examples 1-5 in Tables 1-2, it can be seen that the silicone for digital printing of the present invention, based on vinyl silicone oil as the main component, incorporates a specific ratio of terminal vinyl polymethyltrifluoropropylsiloxane and vinyl dimethylfluorosilane. Through the introduction of oligomeric fluorinated silicone oil and small-molecule fluorinated silane with specific structures and ratios, the two components achieve a synergistic effect, resulting in better flow properties (minimum viscosity of 11.5 mPa·s), longer workability (up to 13 hours at 50°C), and higher precision (minimum linewidth of 22 μm). Example 2 exhibits the best overall performance.

[0233] Comparing Examples 1-3 and Comparative Examples 1-3 in Table 1-2, it can be seen that when vinyl-terminated polymethyltrifluoropropylsiloxane and vinyldimethylfluorosilane are not added to the silicone for digital printing, or only one of them is added, the fluidity, working time, and accuracy of the silicone for digital printing are all poor. It can be seen that vinyl-terminated polymethyltrifluoropropylsiloxane and vinyldimethylfluorosilane have a synergistic effect in the silicone for digital printing, resulting in a technical effect of 1+1>2.

[0234] Comparing Examples 1-3 and Comparative Examples 4-5 in Tables 1-2, it can be seen that when the mass ratio of terminal vinyl polymethyltrifluoropropylsiloxane and vinyl dimethylfluorosilane added to the silicone for digital printing does not meet the range defined by the present invention, it has a negative impact on the fluidity, working time and accuracy of the silicone for digital printing. It can be seen that when the present invention adds fluorinated silicone oil and small molecule fluorinated silane to meet a specific ratio, it brings unexpected technical effects.

[0235] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention and not to limit them. Although the embodiments of the present invention have been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the embodiments of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A silicone for digital printing, consisting of Component A and Component B, characterized in that, The components are composed of the following components and their mass fractions: Component A: Vinyl silicone oil: 100 parts Vinyl-terminated polymethyl trifluoropropyl siloxane: 25-30 parts Vinyl dimethyl fluorosilane: 10-15 parts Fumed silica: 3-5 parts Pt catalyst: 3-5 parts Nanoscale color paste: 1-3 parts The raw materials and weight fractions of the B component are as follows: Hydrogen-containing silicone oil: 100 parts Inhibitor: 5-8 parts Nanoscale color paste: 1-3 parts The mass ratio of the A component and the B component is 10: (2-5); The end vinyl poly-methyl trifluoropropyl siloxane is a vinyl terminated trifluoropropyl methyl-dimethyl copolymer siloxane C 12 H 25 F3O2Si3; The mass ratio of the vinyl-terminated polymethyl trifluoropropyl siloxane and the vinyl dimethyl fluorosilane is (1.5-3):

1.

2. The silica gel for digital printing according to claim 1, characterized by, The vinyl silicone oil is vinyl-terminated polydimethylsiloxane with a vinyl content of 0.06-0.15 mmol / g and a viscosity of 500-2000 mPa·s; The Pt catalyst is a Pt catalyst coordinated with methyl vinyl siloxane, and the Pt content of the Pt catalyst is 3000 ppm; The hydrogen content of the hydrogen-containing silicone oil is 0.1-0.2 wt%; The inhibitor is selected from one or more of methyl butynol, ethynyl cyclohexanol, phenyl butynol, and propyl butynol; The nanoscale color paste is selected from one or more of cyan, magenta, yellow, or black color paste.

3. A method for preparing the silica gel for digital printing according to any one of claims 1 to 2, characterized in that, It includes the following steps: (1) Preparation of A component: Add the formula amount of vinyl silicone oil, vinyl-terminated polymethyl trifluoropropyl siloxane, and vinyl dimethyl fluorosilane into a kneader, start stirring, add the formula amount of fumed silica in three times, heat to 150-170°C and vacuum for 2-3h, then add the formula amount of nanoscale color paste, vacuum for 2-3h at 150-170°C, and obtain a paste after cooling; Take the above paste and the formula amount of Pt catalyst and add them into a planetary mixer to stir for 1-2h until evenly dispersed, and vacuum to obtain the A component; (2) Preparation of B component: Add the formula amount of hydrogen-containing silicone oil, inhibitor, and nanoscale color paste into a planetary mixer and stir for 1-2h until evenly dispersed, and vacuum to obtain the B component; (3) Mix the A and B components in a mass ratio of 10: (2-5) at room temperature to obtain the digital printing silicone.

4. A method for using the silica gel for digital printing according to any one of claims 1 to 2, characterized in that, The application method includes the following steps: (1) After the digital printing silicone prepared according to a certain proportion is drawn by a liquid glue feeder and then automatically mixed uniformly by a static mixer, a digital printer is used for digital spray printing to obtain a digital printing silicone coating; (2) The digital printing silicone coating is baked and cured at 120-130°C for 3-5min to obtain a digital printing silicone product.

5. Application of the digital printing silicone of any one of claims 1-2 in improving the flowability of the digital printing silicone, prolonging the operable time, and improving the precision of the digital printing coating.

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