Anti-interlining on-machine developing type negative image thermosensitive CTP plate material and preparation method of anti-interlining on-machine developing type negative image thermosensitive CTP plate material

Abstract

The invention relates to the technical field of lithographic printing plate materials, and particularly discloses an anti-sticking on-machine developing negative image thermosensitive CTP plate material and a preparation method thereof, the anti-sticking on-machine developing negative image thermosensitive CTP plate material is composed of an aluminum-based substrate, a photosensitive layer and a wool treatment liquid; the rough surface treating fluid comprises the following components: nano silicon dioxide particles, an inorganic stabilizer, an organic binder and the balance of deionized water or ethanol; the formed double-layer photosensitive layer is strong in hydrophilicity and good in photosensitive stability, the nano silicon dioxide added in the rough surface treatment liquid can be stabilized by controlling the proportion content of different particle sizes, the inorganic stabilizer can be used for stabilizing the nano silicon dioxide, and the organic binder can be used for promoting the nano silicon dioxide to be dispersed and stably combined with the photosensitive layer; the Ra value of the formed CTP plate subjected to rough surface treatment is 0.8-2.5 microns, the bonding strength with lining paper is reduced by 60% or above, the plate preparation method has process compatibility, the performance of a photosensitive layer is not affected, the plate has storage stability, and the adhesion phenomenon is not observed when the plate is stored for 6 months under the high-humidity condition.

Description

Technical Field

[0001] This invention relates to the field of offset printing plate technology, specifically to an anti-sticking in-machine developing type negative thermal CTP plate and its preparation method. Background Art

[0002] In-machine developable negative thermal CTP plates are a type of negative computer-to-plate technology that uses laser or LED direct imaging followed by on-site development on the printing press. This special type of thermal CTP plate boasts advantages such as fast photosensitivity, rapid in-machine development and ink-water balance, and high print durability, along with good scratch resistance and storage stability. Due to its chemical-free development characteristic, in-machine developable negative CTP plates have become the mainstream technology in the printing industry. However, these plates typically require stacking with release liner paper after production to prevent surface scratches or contamination. Existing technologies have the following drawbacks:

[0003] 1. Adhesion of backing paper: Traditional CTP plates with a smooth photosensitive coating tend to adhere tightly to the backing paper, especially during storage and transportation in high temperature and humidity environments. This makes it difficult to separate the backing paper and seriously affects production efficiency.

[0004] 2. Existing improvement methods are insufficient: Conventional CTP plates mostly adopt the process of directly cutting and stacking after coating. Although the adhesion can be partially relieved by adjusting the coating hardness or adding anti-sticking agents, the photosensitive properties or printing durability of the coating are sacrificed.

[0005] Therefore, how to effectively increase the surface roughness of negative CTP plates while ensuring their photosensitivity, avoiding excessive adhesion to the backing paper, and without affecting the hydrophilicity of the coating and the printing durability is a major problem in the existing negative CTP plate preparation technology. Summary of the Invention

[0006] The technical problem to be solved by the present invention is the problem of adhesion between the surface of this type of printing plate and the backing paper during the production and storage process, which is a problem in the prior art.

[0007] The present invention solves the above-mentioned technical problems and provides an anti-sticking in-machine developing type negative thermal CTP plate, which is composed of an aluminum base material, a photosensitive layer and a texture treatment solution;

[0008] The photosensitive layer comprises an upper photosensitive layer and a lower photosensitive layer;

[0009] The photosensitive upper layer is composed of the following components by weight: 22-25 parts of phosphate-containing polyurethane resin, 1-5 parts of dilution and dispersion system, 0.1-0.9 parts of photoinitiator, and 1-5 parts of infrared absorber;

[0010] The photosensitive lower layer is composed of the following components in parts by weight: 18-23 parts of carboxyl-modified acrylic resin, 0.1-0.9 parts of photoinitiator, and 1-5 parts of hydrophilic photosensitive material;

[0011] The photosensitive upper layer contains a dilution and dispersion system with strong hydrophilic dispersibility; while the photosensitive upper layer contains hydrophilic photosensitive microparticles, which have hydrophilicity and high photosensitivity, forming a double-layer hydrophilic structure that can regulate and achieve ink-water separation balance.

[0012] The infrared absorber is one of the following: triphenylamine dyes, polyacetylenic dyes, metal phthalocyanine dyes, and polyacetylenic dyes.

[0013] The photoinitiator is one of azobisisobutyronitrile, thioonium salt, benzoyl carbamate, and benzophenone;

[0014] The hydrophilic photosensitive microparticles are obtained by mixing iron alginate and azo dye in a mass ratio of 1-4:11-15. Iron alginate contains carboxylic acid groups and hydroxyl groups, which can increase the hydrophilicity of the dye, and its structure can improve the stability and light absorption performance of the azo dye.

[0015] The surface treatment liquid contains the following components: nano-silica particles, inorganic stabilizer, organic binder, and the balance is deionized water or ethanol.

[0016] The surface treatment solution contains the following components by mass percentage: 3-10% nano-silica particles, 0.5-2% inorganic stabilizer, 0.5-5% organic binder, and the balance being deionized water or ethanol. The surface treatment solution contains nano-silica of different particle sizes, and the added organic binder can be compounded with the inorganic stabilizer to disperse and fix the nano-silica, forming a uniform rough surface with strong stability and resistance to damage.

[0017] The nano-silica has a particle size of 5-20μm and 20-50μm, and the ratio of the particles used is 10:1-3; a certain proportion of nano-silica with different particle sizes can form a suitable roughness.

[0018] The inorganic stabilizer is one or more of silicates and carbonates;

[0019] The organic binder is obtained by mixing polyvinylpyrrolidone and lignin sulfonate in a molar ratio of 11-13:1-3; the added amino and sulfonic acid groups can electrostatically adsorb with the hydrophilic groups of the photosensitive layer, increasing the bonding effect between the nano-silica and the photosensitive layer, and improving the dispersibility of the nano-silica.

[0020] The dilution and dispersion system consists of hydroxyethyl vinyl ether and modified polyfunctional acrylate in a volume ratio of 9-12:1-3. The modified polyfunctional acrylate is prepared by adjusting the pH of the polyfunctional acrylate to 7-8, mixing it with an ethoxylated fatty acid glyceride solution with a mass concentration of 18-22% at a solid-liquid ratio of 1:4-7 g / mL, refluxing and heating for 60-80 min, adjusting the pH to neutral, and removing the solvent. The ethoxylated fatty acid glyceride solution is obtained by dissolving ethoxylated fatty acid glyceride in dimethyl sulfoxide. The hydroxyethyl vinyl ether introduces ether bonds and double bonds to increase the resin flexibility, while the modified polyfunctional acrylate introduces hydroxyl, amino, and hydrophilic short chains to increase the resin dispersibility and regulate the crosslinking density.

[0021] This invention also provides a method for preparing an in-machine developable negative thermal CTP plate with anti-adhesion backing, comprising the following steps:

[0022] Step 1: Substrate treatment: The aluminum substrate is roughened by electrolysis and anodized to form aluminum oxide.

[0023] Step 2: Photosensitive layer coating: Coat the lower photosensitive layer and the upper photosensitive layer sequentially, and after drying, the coating thicknesses are 1.0-1.4 g / m², respectively. 2 and 0.7-0.9 g / m 2 .

[0024] Step 3: Apply the surface treatment liquid using reverse gravure coating. The wet coating thickness is 3-8μm. Cure with hot air at 80-100℃ for 5-10 seconds to form a uniformly distributed micro-pit structure.

[0025] The beneficial effects of this invention are as follows: This invention provides an anti-adhesion, in-machine developable negative thermal CTP plate material. The photosensitive layer contains a double layer of hydrophilic resin. The lower photosensitive layer contains carboxyl-modified acrylic resin and hydrophilic photosensitive material, and the upper photosensitive layer contains phosphate-based polyurethane resin and a dilution and dispersion system. The resulting double photosensitive layer has strong hydrophilicity and good photosensitivity. The nano-silica added to the matte surface treatment liquid controls the proportion of different particle sizes. The inorganic stabilizer can stabilize the nano-silica, and the organic binder can promote the dispersion of the nano-silica and its stable bonding with the photosensitive layer. The Ra value of the matte-treated CTP plate material is between 0.8-2.5μm, and the bonding strength with the backing paper is reduced by more than 60%.

[0026] This invention also provides a method for preparing an in-machine developable negative thermal CTP plate with anti-adhesion backing. The CTP plate undergoes a rough surface treatment, exhibiting process compatibility. Core indicators such as photosensitive layer curing speed, ink-water balance, and printing durability (≥200,000 prints) are comparable to those of traditional processes. Furthermore, it demonstrates storage stability, with no adhesion observed after 6 months of storage under high humidity conditions (80% RH, 40℃). Detailed Implementation

[0027] The present invention will be further described in detail below through specific implementation examples. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of protection of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art fall within the scope of the appended claims.

[0028] Unless otherwise specified, all raw materials and reagents used in this invention are from the conventional market.

[0029] Example 1

[0030] A method for preparing an in-machine developable negative thermal CTP plate with anti-sticking backing includes the following steps:

[0031] Step 1: Substrate treatment: The aluminum substrate is roughened by electrolysis and anodized to form aluminum oxide;

[0032] Step 2: Photosensitive layer coating: The lower photosensitive layer and the upper photosensitive layer are coated sequentially, and the coating thicknesses after drying are 1.2 g / m². 2 and 0.8g / m 2 ;

[0033] The photosensitive upper layer is composed of the following components by weight: 24 parts of phosphate-containing polyurethane resin, 3 parts of dilution and dispersion system, 0.5 parts of azobisisobutyronitrile, and 3 parts of triphenylamine dye; the dilution and dispersion system is hydroxyethyl vinyl ether and modified polyfunctional acrylate in a volume ratio of 10:2; the modified polyfunctional acrylate is prepared by adjusting the pH of the polyfunctional acrylate to 7, mixing it with a 20% ethoxylated fatty acid glyceride solution at a solid-liquid ratio of 1:5 g / mL, refluxing and heating for 70 min, adjusting the pH to neutral, and removing the solvent; the ethoxylated fatty acid glyceride solution is obtained by dissolving ethoxylated fatty acid glyceride in dimethyl sulfoxide.

[0034] The photosensitive lower layer is composed of the following components in parts by weight: 20 parts of carboxyl-modified acrylic resin, 0.5 parts of azobisisobutyronitrile, and 3 parts of hydrophilic photosensitive material; the hydrophilic photosensitive microparticles are obtained by mixing iron alginate and azo dye in a mass ratio of 2:13.

[0035] Step 3: Apply the surface treatment liquid using reverse gravure coating method. The wet coating thickness is 5μm. Cure with hot air at 90℃ for 8 seconds to form a uniformly distributed micro-pit structure.

[0036] The surface treatment liquid contains the following components by mass percentage: 6% nano-silica particles, 0.5-2% silicate, 0.5-5% organic binder, and the balance being ethanol; the nano-silica particles have a particle size of 5-20 μm and 20-50 μm, and the ratio is 10:2; the organic binder is obtained by mixing polyvinylpyrrolidone and lignin sulfonate in a molar ratio of 12:2.

[0037] Example 2

[0038] A method for preparing an in-machine developable negative thermal CTP plate with anti-sticking backing includes the following steps:

[0039] Step 1: Substrate treatment: The aluminum substrate is roughened by electrolysis and anodized to form aluminum oxide;

[0040] Step 2: Photosensitive layer coating: The lower photosensitive layer and the upper photosensitive layer are coated sequentially, and the coating thicknesses after drying are 1.0 g / m². 2 and 0.7g / m 2 ;

[0041] The photosensitive upper layer is composed of the following components by weight: 22 parts of phosphate-containing polyurethane resin, 1 part of dilution and dispersion system, 0.1 parts of thioonium salt, and 1 part of polyacetylenic dye; the dilution and dispersion system is hydroxyethyl vinyl ether and modified polyfunctional acrylate in a volume ratio of 9:1; the modified polyfunctional acrylate is prepared by adjusting the pH of the polyfunctional acrylate to 7, mixing it with an 18% ethoxylated fatty acid glyceride solution at a solid-liquid ratio of 1:4 g / mL, refluxing and heating for 60 min, adjusting the pH to neutral, and removing the solvent; the ethoxylated fatty acid glyceride solution is obtained by dissolving ethoxylated fatty acid glyceride in dimethyl sulfoxide.

[0042] The photosensitive lower layer is composed of the following components in parts by weight: 18 parts of carboxyl-modified acrylic resin, 0.1 parts of photoinitiator, and 1 part of hydrophilic photosensitive material; the hydrophilic photosensitive microparticles are obtained by mixing iron alginate and azo dye in a mass ratio of 1:11.

[0043] Step 3: Apply the surface treatment liquid using reverse gravure coating. The wet coating thickness is 3-8 μm. Cur with hot air at 80℃ for 5 seconds to form a uniformly distributed micro-pit structure.

[0044] The surface treatment liquid contains the following components by mass percentage: 3% nano-silica particles, 0.5% carbonate, 0.5% organic binder, and the balance being ethanol; the nano-silica particles have a particle size of 5-20 μm and 20-50 μm, and the ratio is 10:1; the organic binder is obtained by mixing polyvinylpyrrolidone and lignin sulfonate in a molar ratio of 11:1.

[0045] Example 3

[0046] A method for preparing an in-machine developable negative thermal CTP plate with anti-sticking backing includes the following steps:

[0047] Step 1: Substrate treatment: The aluminum substrate is roughened by electrolysis and anodized to form aluminum oxide;

[0048] Step 2: Photosensitive layer coating: The lower photosensitive layer and the upper photosensitive layer are coated sequentially, and the coating thicknesses after drying are 1.4 g / m². 2 and 0.9g / m 2 ;

[0049] The photosensitive upper layer is composed of the following components by weight: 25 parts of phosphate-containing polyurethane resin, 5 parts of dilution and dispersion system, 0.9 parts of benzophenone, and 5 parts of metal phthalocyanine dye; the dilution and dispersion system is hydroxyethyl vinyl ether and modified polyfunctional acrylate in a volume ratio of 12:3; the modified polyfunctional acrylate is prepared by adjusting the pH of the polyfunctional acrylate to 8, mixing it with a 22% ethoxylated fatty acid glyceride solution at a solid-liquid ratio of 1:7 g / mL, refluxing and heating for 80 min, adjusting the pH to neutral, and removing the solvent; the ethoxylated fatty acid glyceride solution is obtained by dissolving ethoxylated fatty acid glyceride in dimethyl sulfoxide.

[0050] The photosensitive lower layer is composed of the following components in parts by weight: 23 parts carboxyl-modified acrylic resin, 0.9 parts benzophenone, and 5 parts hydrophilic photosensitive material; the hydrophilic photosensitive microparticles are obtained by mixing iron alginate and azo dye in a mass ratio of 4:15.

[0051] Step 3: Apply the surface treatment liquid using reverse gravure coating method. The wet coating thickness is 8μm. Cur with hot air at 100℃ for 10 seconds to form a uniformly distributed micro-pit structure.

[0052] The surface treatment solution comprises the following components by weight percentage: 10% nano-silica particles, 2% silicate, 5% organic binder, and the balance being deionized water;

[0053] The nano-silica has a particle size of 5-20μm and 20-50μm, and the ratio of the particles is 10:3; the organic binder is obtained by mixing polyvinylpyrrolidone and lignin sulfonate in a molar ratio of 13:3.

[0054] Example 4

[0055] A method for preparing an in-machine developable negative thermal CTP plate with anti-sticking backing includes the following steps:

[0056] Step 1: Substrate treatment: The aluminum substrate is roughened by electrolysis and anodized to form aluminum oxide;

[0057] Step 2: Photosensitive layer coating: The lower photosensitive layer and the upper photosensitive layer are coated sequentially, and the coating thicknesses after drying are 1.1 g / m². 2 and 0.9g / m 2 ;

[0058] The photosensitive upper layer is composed of the following components by weight: 24 parts of phosphate-containing polyurethane resin, 2 parts of dilution and dispersion system, 0.3 parts of benzophenone, and 4 parts of polyoxymethylene dye; the dilution and dispersion system is hydroxyethyl vinyl ether and modified polyfunctional acrylate in a volume ratio of 11:3; the modified polyfunctional acrylate is prepared by adjusting the pH of the polyfunctional acrylate to 8, mixing it with a 21% ethoxylated fatty acid glyceride solution at a solid-liquid ratio of 1:6 g / mL, refluxing and heating for 80 min, adjusting the pH to neutral, and removing the solvent; the ethoxylated fatty acid glyceride solution is obtained by dissolving ethoxylated fatty acid glyceride in dimethyl sulfoxide.

[0059] The photosensitive lower layer is composed of the following components in parts by weight: 22 parts of carboxyl-modified acrylic resin, 0.8 parts of benzophenone, and 4 parts of hydrophilic photosensitive material; the hydrophilic photosensitive microparticles are obtained by mixing iron alginate and azo dye in a mass ratio of 3:14.

[0060] Step 3: Apply the surface treatment liquid using reverse gravure coating method. The wet coating thickness is 7μm. Cur with hot air at 90℃ for 10 seconds to form a uniformly distributed micro-pit structure.

[0061] The surface treatment liquid contains the following components by mass percentage: 9% nano-silica particles, silicate, carbonate 1.5% and organic binder 4%, with the balance being ethanol; the nano-silica particles have a particle size of 5-20 μm and 20-50 μm, and the ratio is 10:2; the organic binder is obtained by mixing polyvinylpyrrolidone and lignin sulfonate in a molar ratio of 12:1.

[0062] Comparative Example 1

[0063] The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 did not undergo surface roughening treatment, while other aspects remained unchanged.

[0064] Comparative Example 2

[0065] The difference between Comparative Example 2 and Example 1 is that the organic binder of the surface treatment liquid in Comparative Example 2 is unmodified polyvinylpyrrolidone, while everything else remains the same.

[0066] Comparative Example 3

[0067] The difference between Comparative Example 3 and Example 1 is that no dilution dispersion system was added to the upper layer of the photosensitive layer in Comparative Example 3, while everything else remained the same.

[0068] Comparative Example 4

[0069] The difference between Comparative Example 4 and Example 1 is that the lower layer of the photosensitive layer in Comparative Example 4 uses an infrared absorber instead of hydrophilic photosensitive microparticles, while everything else remains the same.

[0070] I. The photosensitive layer properties of the negative thermal CTP plates prepared in the examples and comparative examples were tested. The testing methods are as follows, and the test results are shown in Table 1:

[0071] (1) Curing speed: The surface drying time and actual drying time of the prepared sample were tested, respectively, according to the standards ASTM D5895 (finger test) and ISO 1519 (cross test).

[0072] Table 1 Curing speed of CTP plates

[0073]

[0074] As shown in Table 1, the curing speed of the photosensitive layer of the CTP plate prepared by the present invention is similar to that of traditional plates, indicating that the surface treatment of the CTP plate and the adjustment of the hydrophilicity of the photosensitive layer in the process of the present invention do not affect the curing and crosslinking reaction of the photosensitive layer.

[0075] II. For the photosensitive layer (1) the prepared sample is heated and humidified in a 50℃, 80% humid heat aging chamber: the sample is placed in the humid heat aging chamber for three days, the sample is made on the plate-making machine, and then developed and processed; its sensitivity is tested.

[0076] (2) The printing durability was verified by GB / T 23594-2021 test.

[0077] Table 2. Printability and Sensitivity of CTP Plates

[0078]

[0079]

[0080] As shown in Table 2, the photosensitive layer of the present invention has good printing durability and sensitivity, and good thermal conductivity.

[0081] As can be seen from Comparative Example 3, the dilution and dispersion system added to the upper layer of the photosensitive layer of the present invention is composed of modified multifunctional acrylate and hydroxyethyl vinyl ether, with a high content of hydrophilic groups, which increases the hydrophilicity and dispersion performance of the photosensitive layer, and improves the performance of the photosensitive layer by controlling the resin crosslinking density and introducing groups.

[0082] As can be seen from Comparative Example 4, the addition of hydrophilic photosensitive microparticles to the photosensitive lower layer of the present invention results in high light absorption and thermal conductivity.

[0083] (1) The bonding strength was verified by the ASTM D3359 peel force test;

[0084] (2) The surface morphology Ra value was verified by scanning electron microscopy (SEM) and atomic force microscopy (AFM);

[0085] (3) Store the board under high humidity conditions (80% RH, 40℃) for 6 months, compare the peel strength of the board before and after storage, and record the difference.

[0086] Table 1 Performance of CTP Plates

[0087]

[0088]

[0089] As shown in Table 1, the photosensitive layer of the CTP plate prepared by the present invention is a double-layer hydrophilic material, which has the advantages of fast curing speed, good photosensitivity and high printing durability. The coating of the rough surface treatment liquid can effectively reduce the bonding strength, has storage stability, and moderate surface roughness with Ra value between 0.8-2.5μm. It prevents sticking while avoiding excessive roughness that could damage the printed image.

[0090] As can be seen from Comparative Example 1, the surface treatment liquid of the present invention treats CTP boards, reduces the surface bonding strength of the boards, improves the anti-sticking properties, and does not affect the performance of the boards.

[0091] As can be seen from Comparative Example 2, the organic binder added to the surface treatment liquid of the present invention contains sulfonic acid groups and amino groups, which improve the bonding performance between nano-silica and photosensitive layer and improve the stability of the board after surface treatment.

[0092] As can be seen from Comparative Example 3, the dilution and dispersion system added to the upper layer of the photosensitive layer of the present invention is composed of modified multifunctional acrylate and hydroxyethyl vinyl ether. Compared with single hydroxyethyl vinyl ether, it controls the content of hydrophilic groups, improves the bonding performance between silica and the photosensitive layer, and improves the surface treatment effect.

[0093] In summary, as shown in Tables 1-3, the photosensitive layer of the CTP plate prepared by this invention is a double-layer hydrophilic material, which has the advantages of fast curing speed, good photosensitivity and high printing durability. The coating of the rough surface treatment liquid can effectively reduce the bonding strength, has storage stability, and moderate surface roughness with Ra value between 0.8-2.5μm. It prevents sticking while avoiding excessive roughness that could damage the printed image.

Claims

1. A non-stick, in-machine developing type negative thermal CTP plate, characterized in that, It consists of an aluminum-based substrate, a photosensitive layer, and a wool treatment solution; The photosensitive layer comprises an upper photosensitive layer and a lower photosensitive layer; The photosensitive upper layer is composed of the following components by weight: 22-25 parts of phosphate-containing polyurethane resin, 1-5 parts of dilution and dispersion system, 0.1-0.9 parts of photoinitiator, and 1-5 parts of infrared absorber; The photosensitive lower layer is composed of the following components in parts by weight: 18-23 parts of carboxyl-modified acrylic resin, 0.1-0.9 parts of photoinitiator, and 1-5 parts of hydrophilic photosensitive material; The surface treatment liquid contains the following components: nano-silica particles, inorganic stabilizer, organic binder, and the balance is deionized water or ethanol.

2. The anti-sticking, in-machine developing type negative thermal CTP plate according to claim 1, characterized in that, The surface treatment solution contains the following components by mass percentage: 3-10% nano-silica particles, 0.5-2% inorganic stabilizer, 0.5-5% organic binder, and the balance being deionized water or ethanol.

3. The anti-sticking in-machine developing type negative thermal CTP plate according to claim 1, characterized in that, The nano-silica has a particle size of 5-20μm and 20-50μm, and the ratio of the particles used is 10:1-3.

4. The anti-sticking, in-machine developing type negative thermal CTP plate according to claim 1, characterized in that, The inorganic stabilizer is one or more of silicates and carbonates.

5. The anti-sticking, in-machine developing type negative thermal CTP plate according to claim 1, characterized in that, The organic binder is obtained by mixing polyvinylpyrrolidone and lignin sulfonate in a molar ratio of 11-13:1-3.

6. The anti-sticking in-machine developing type negative thermal CTP plate according to claim 1, characterized in that, The hydrophilic photosensitive microparticles are obtained by mixing iron alginate and azo dye in a mass ratio of 1-4:11-15.

7. The anti-adhesion in-machine developing type negative thermal CTP plate according to claim 1, characterized in that, The dilution and dispersion system consists of hydroxyethyl vinyl ether and modified polyfunctional acrylate in a volume ratio of 9-12:1-3.

8. The anti-sticking in-machine developing type negative thermal CTP plate according to claim 7, characterized in that, The modified polyfunctional acrylate was prepared by adjusting the pH of the polyfunctional acrylate to 7-8, mixing it with an ethoxylated fatty acid glyceride solution with a mass concentration of 18-22% at a solid-liquid ratio of 1:4-7 g / mL, refluxing and heating for 60-80 min, adjusting the pH to neutral, and removing the solvent. The ethoxylated fatty acid glyceride solution was obtained by dissolving ethoxylated fatty acid glyceride in dimethyl sulfoxide.

9. The anti-sticking in-machine developing type negative thermal CTP plate according to claim 1, characterized in that, The infrared absorber is one of triphenylamine dyes, polyacetylenic dyes, metal phthalocyanine dyes, and polyacetylenic dyes.

10. A method for preparing an in-machine developable negative thermal CTP plate with anti-adhesion properties, used to prepare the in-machine developable negative thermal CTP plate as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Substrate treatment: The aluminum substrate is roughened by electrolysis and anodized to form aluminum oxide. Step 2: Photosensitive layer coating: Coat the lower photosensitive layer and the upper photosensitive layer sequentially, and after drying, the coating thicknesses are 1.0-1.4 g / m², respectively. 2 and 0.7-0.9 g / m 2 . Step 3: Apply the surface treatment liquid using reverse gravure coating. The wet coating thickness is 3-8μm. Cure with hot air at 80-100℃ for 5-10 seconds to form a uniformly distributed micro-pit structure.

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