A photocurable coating composition, a color-identifying coating layer and applications thereof

Abstract

The present application belongs to the technical field of light-cured coating, and particularly relates to a coating composition capable of being identified by color and applied on a soft PVC substrate, and a preparation method and application of the coating. The coating composition comprises the following components in mass fraction: 50-70 parts of light-cured base resin; 1-2 parts of photoinitiator; 1-3 parts of color paste; 10-15 parts of isobornyl acrylate solution of chlorinated polypropylene; and active diluent. The coating composition can be directly applied on the PVC substrate without pre-treatment of the substrate. The film forming process is simple, and the film can be formed by means of blade coating, curtain coating and spraying. The curing speed is fast, and the coating after curing has no shrinkage, and is suitable for continuous industrial production line. The transparent coating and colored coating prepared after light curing have the characteristics of fast curing, wear resistance, good toughness, high adhesion and removal of coating solvent, and excellent aging resistance. No VOC is released during the film forming process, which is more environmentally friendly. The light-cured thickness of the coating can reach 300 microns, and has a significant application prospect.

Description

Technical Field

[0001] This invention belongs to the field of photocurable coating technology, and particularly relates to a color-identifiable coating applied to a flexible PVC substrate. Background Technology

[0002] During the production and use of electrical wires, cables, and PVC pipes, different phase wires require different color markings. Current production processes, using masterbatches of specific colors and heated co-extrusion in an extruder, are not only costly but also demanding in terms of equipment. During the laying and splicing of electrical wires and cables, due to the construction environment and operator actions, cables are frequently dragged, generating significant friction that wears down the outer sheath and poses safety hazards. Furthermore, the use of electrical wires, cables, and various PVC pipes often takes place in environments exposed to direct sunlight or damp underground conditions, accompanied by mechanical friction. All of these factors accelerate the aging of the cable sheath, causing irreversible damage to personal safety and property.

[0003] Coating is an important way to solve these problems, but the main difficulties in promoting the use of coatings on PVC and other plastic substrates are: ① Matching the coating curing efficiency with the production line. Since wires and cables are produced on assembly lines, the production process requires fast curing speed to meet the requirements of industrial production lines. ② Due to environmental protection requirements, the control of VOC emissions during the production process is becoming increasingly strict. ③ Adhesion requirements of PVC and other plastic substrates. PVC substrates often have poor adhesion due to their low polarity and poor coating wetting. ④ Performance requirements of the coating itself. The installation and use environment of wire and cable outer sheaths are harsh, requiring high coating performance. It not only needs to have excellent toughness, but also good wear resistance and weather resistance.

[0004] To address the shortcomings of existing technologies, there is a need to develop a coating composition that is simple to produce, environmentally friendly, has color recognition capabilities, and also exhibits good wear resistance and weather resistance. Summary of the Invention

[0005] To address the coating problems encountered with plastic substrates such as wires and cables, this invention utilizes photocuring technology to provide a photocurable coating composition for cable protection, the coating itself, and its applications. This coating composition is environmentally friendly, has a simple manufacturing process, and the resulting coating can be applied to plastic substrates such as PVC or PP, and can be identified by color.

[0006] The first objective of this invention is to provide a color-recognition photocurable coating composition for cable coatings, comprising the following raw materials in parts by weight:

[0007] 50-70 parts of UV-curable matrix resin;

[0008] 20-30 parts of the first reactive diluent;

[0009] 1-2 parts of photoinitiator;

[0010] 1-3 parts color paste;

[0011] Chlorinated polypropylene 4-7.5 parts;

[0012] 25-42 parts of the second reactive diluent.

[0013] Furthermore, the photocurable matrix resin is a polyether-type polyurethane oligomer resin or a polyester-type polyurethane oligomer resin; the functionality is 2-4.

[0014] In some preferred embodiments, the photocurable matrix resin is selected from one or a combination of Kailin Ruiyang RY2203 and Changxing Chemical 6123 / 6126.

[0015] In some preferred embodiments, the second reactive diluent is selected from one or a combination of isoborneol acrylate IBOA and isoborneol methacrylate IBOMA.

[0016] Furthermore, the first reactive diluent is a multifunctional reactive diluent with a functionality ≥2.

[0017] Further, the first reactive diluent is selected from one or a combination of 1,6-hexanediol diacrylate (HDDA), dipropylene glycol acrylate (DPGDA), tripropylene glycol acrylate (TPGDA), 1,6-hexanediol dimethacrylate (HDDMA), trimethylolpropane trimethacrylate (TMPTMA), trimethylolpropane triacrylate (TMPTA), dipropylene glycol acrylate (DPGDA), and tripropylene glycol triacrylate (TPGDA).

[0018] Furthermore, the chlorinated polypropylene (CPP) contains no less than 24% chlorine.

[0019] Furthermore, the color paste is a special color paste for photocuring.

[0020] Furthermore, the photoinitiator is selected from one or a combination of 2-hydroxy-2-methyl-1-phenyl-1-propanone / 1173, phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide / 819, and diphenyl-(2,4,6-trimethylbenzoyl)phosphine oxide / TPO.

[0021] A second objective of this invention is to provide a method for preparing a color-recognition photocurable coating composition for cable coatings, comprising the following steps:

[0022] S11; Weigh 50-80 parts of the second reactive diluent and 50-20 parts of chlorinated polypropylene, mix them, heat to 50-80℃, and stir until homogeneous to obtain mixture A;

[0023] S12; Weigh 50-65 parts of the light-curing matrix resin; 20-30 parts of the first reactive diluent; 1-3 parts of the photoinitiator; 10-15 parts of the mixture A; 1-2 parts of the color paste; and 5-10 parts of the second reactive diluent, and mix them evenly.

[0024] In one embodiment, the mixing is achieved using a high-speed disperser or mechanical stirring.

[0025] In one embodiment, a high-speed disperser is used to disperse the material at 1000rpm-2600rpm for 2-30 minutes;

[0026] In one embodiment, mechanical stirring is used at 300-800 rpm for 2-4 hours.

[0027] The third objective of this application is to provide a high-toughness, high-wear-resistant color-recognition photocurable cable coating; the coating is obtained by using the coating composition described above, or the coating composition prepared by the preparation method described above, and then curing it.

[0028] Furthermore, the preparation method of the high-toughness, high-wear-resistant color-recognition photocurable cable coating includes the following steps:

[0029] S21: The coating composition is applied by spraying, scraping, or spraying to form a uniform wet film.

[0030] S22: UV curing or electron beam curing.

[0031] Furthermore, in step S21, the wet film thickness is 30-300 μm; the photocurable coating composition provided in this application can achieve a one-time curing thickness of 300 μm.

[0032] Furthermore, in step S22, the energy of the ultraviolet curing light source is 2000-2500 mJ / cm2, and the speed is 5.5-10 m / s.

[0033] In one embodiment, a full-wave ultraviolet light source tracked curing machine is used to cure the wet film into a film.

[0034] Furthermore, after curing into a film, the hardness of the coating is 2B to HB.

[0035] Furthermore, the coating can be removed by solvent.

[0036] In some embodiments, the solvent is selected from one or a combination of solvents such as ethanol, acetone, and ethyl acetate.

[0037] The ability of coatings to be removed by solvents has significant practical implications in industrial production. For example, in the process of producing cables, if the color is mismatched or defective dyed products are produced, solvents can be used to wash off the residue and then re-dye the product, thus avoiding waste of materials.

[0038] The fourth objective of this application is to provide the application of the coating or paint composition described above for preparing a high-toughness, high-wear-resistant color recognition coating on the surface of a plastic substrate;

[0039] Furthermore, the substrate includes, but is not limited to, PVC or PP substrates.

[0040] This coating can form a scratch-resistant, weather-resistant film with color recognition properties on the surface of PVC or PP substrates. In industrial production, it can be quickly cured on the surface of cables, PVC pipes, profiles, etc., forming a protective coating and improving service life.

[0041] Furthermore, the toughness and hardness of the coating can be adjusted by changing the ratio of the two reactive diluents. Increasing the proportion of HDDA in the first reactive diluent (not exceeding 30 parts) and decreasing the proportion of IBOA in the second reactive diluent (not less than 10 parts) can increase the coating hardness to HB. Increasing the proportion of IBOA in the second reactive diluent (not exceeding 30 parts) and decreasing the proportion of HDDA in the first reactive diluent can improve the coating toughness. By controlling the toughness and hardness of the coating, it can better adapt to substrates with different properties and better adapt to various application environments such as bending, torsion, deformation, and friction.

[0042] Beneficial effects:

[0043] The coating composition system prepared in this application exhibits good overall compatibility and storage stability; it can be directly applied to PVC substrates with excellent wettability, requiring no pretreatment of the substrate. Furthermore, the film-forming process is simple, allowing for film formation via blade coating, curtain coating, and spray coating, with low equipment requirements and compatibility with other equipment used in industrial production. The prepared wet film cures rapidly after photocuring, making it particularly suitable for preparing high-toughness, high-wear-resistance, and color-identifying protective coatings on PVC or PP substrates. The hardness and toughness of the coating are adjustable to adapt to different application scenarios.

[0044] The transparent and colored coatings prepared by photocuring exhibit rapid curing, wear resistance, good toughness, resistance to high and low temperatures, weather resistance without cracking, and solvent removability. The film-forming process releases no VOCs, making it more environmentally friendly. The coating thickness can reach 300μm in a single photocuring step. The coating hardness is between 2B and HB, with grade 0 adhesion. The coating demonstrates high weather resistance, with weathering tests exceeding 1000 hours showing no peeling, cracking, or hardening. Tensile property tests show an elongation at break between 150% and 220%.

[0045] The coating composition prepared in this application can be used to prepare coatings with color recognition function, solving the problem of applying photocuring technology in colored systems in the prior art. Different colors can be prepared by mixing different color pastes according to the requirements of the substrate, thereby producing photocurable coatings of different colors. Attached Figure Description

[0046] Figure 1 Comparative test results of load-bearing wear resistance between uncoated samples and samples with the coating prepared in Example 1;

[0047] Figure 2 The deformation effect of the colored coating prepared in Example 2 applied to PVC sheets and cables;

[0048] Figure 3 Aging test results of uncoated PVC boards;

[0049] Figure 4 Aging test results of PVC boards coated with the transparent coating prepared in Example 4;

[0050] Figure 5 Aging test results of PVC boards coated with the red coating prepared in Example 6;

[0051] Figure 6 Aging test results of PVC boards coated with the yellow coating prepared in Example 6;

[0052] Figure 7 Tensile curve of the coating composition prepared in Example 6 Detailed Implementation

[0053] The present invention will be further described below with reference to the accompanying drawings and embodiments. The present invention can be better understood from the following embodiments. However, those skilled in the art will readily understand that the specific material ratios, process conditions, and results described in the embodiments are for illustrative purposes only and should not, and will not, limit the present invention as described in detail in the claims.

[0054] The testing methods for coating performance are as follows:

[0055] 1. Basic properties of the membrane: Using flexible PVC sheets for the outer sheath of wires and cables as the coating substrate, the basic properties of the cured membrane were tested.

[0056] Thickness: Measured using a German Qnix 1500 coating thickness gauge, with multiple tests taken and the average value recorded.

[0057] Pencil hardness: The pencil hardness of the cured film was determined manually using a BYK cart pencil hardness tester according to standard GB / T 6739-1996 and ASTM D3363-00.

[0058] Adhesion: According to standards GB / T 9286-1998 and ISO2409-72, the QFH coating cross-cut tester is used to test the adhesion of the cured film by the degree of damage of the cross-cut coating.

[0059] High and low temperature resistance: The sample was frozen at -18℃ for 24 hours, thawed at room temperature, and then dried at 80℃ for 24 hours. After being taken out, the adhesion and flexibility were tested again, and the cycle was repeated 10 times.

[0060] 2. Tensile Properties: The samples were prepared into dumbbell-shaped specimens using a polytetrafluoroethylene mold. The central dimensions of the tensile specimens were 16 mm × 3.8 mm × 2 mm. The tensile properties of the specimens were tested using an Instron 5967 tensile testing machine according to ASTM D412-D standard. The tensile rate was 10 mm / min, and multiple measurements were taken at room temperature, with the average value recorded.

[0061] 3. Aging resistance: Samples were placed in a UV aging tester, and the aging of the coating was recorded at regular intervals. The test method was conducted according to the national standard GB / T 1865-1997.

[0062] 4. Abrasion resistance: Multifunctional alcohol-rubber abrasion tester: 300g load, 500 cycles of steel wool abrasion, observe the surface. Refer to GB / T 6545-1998.

[0063] Example 1

[0064] The raw materials used in Example 1 are as follows:

[0065] Table 1. UV-cured high-toughness, wear-resistant, color-identifying cable coating formulation

[0066]

[0067] Preparation steps:

[0068] 1. Preparation of adhesion promoter solution: Weigh isobornyl acrylate IBOA and chlorinated polypropylene 526P according to the mass ratio in Table 1, heat to 50℃, and stir evenly to obtain a mixed solution of adhesion promoter.

[0069] 2. Weigh out the following components according to the mass ratio in Table 1: photocurable matrix resin; first reactive diluent HDDA; one part each of photoinitiator 1173 and TPO; chlorinated polypropylene and isobornyl acrylate solution; 2 parts Hostatint Clariant color paste; and isobornyl acrylate IBOA. Mix them thoroughly using a high-speed dispersant at 2600 rpm for 2.5 min.

[0070] 3. Using a scraper coating method, a uniform wet film with a thickness of 100μm is coated. The film is then cured by a full-wave ultraviolet light source in a conveyor belt curing machine with the light source energy adjusted to 2000 mJ / cm2 at 5.5m / s to obtain the test sample.

[0071] Example 2

[0072] Raw materials:

[0073] Chlorinated polypropylene (CPP) (814), Nippon Paper Manufacturing Co., Ltd.

[0074] Polyurethane acrylate (RY2203) industrial grade, Jiangsu Kailin Ruiyang Chemical Co., Ltd.;

[0075] 2-Hydroxy-2-methyl-1-phenylpropanone (1173): Analytical grade, Tianjin Jiuri New Materials Co., Ltd.;

[0076] IBOOA (Isobornyl Acrylate): Industrial grade, Changxing Special Materials Co., Ltd.

[0077] 1,6-Hexanediol diacrylate (HDDA) industrial grade, Changxing Special Materials Co., Ltd.

[0078] Hostatint Clariant Pigments (Clariant Chemicals (China) Co., Ltd.);

[0079] Table 2 UV-cured high-toughness, wear-resistant, color-identifying cable coating formulation

[0080]

[0081] Preparation steps:

[0082] 1. Preparation of adhesion promoter solution: Weigh isobornyl acrylate IBOA and chlorinated polypropylene 814 according to the mass ratio in Table 1, heat to 70℃, and stir evenly to obtain a mixed solution of adhesion promoter.

[0083] 2. Weigh the following components according to the mass ratio in Table 2: UV-curable matrix resin; HDDA (first reactive diluent); 1.5 parts of photoinitiator 1173; chlorinated polypropylene and isoborneol acrylate solution; 3 parts of Hostatint Clariant color paste; and IBOA (isoborneol acrylate). Mix them thoroughly using a high-speed dispersant at 2600 rpm for 30 minutes.

[0084] 3. Using a spraying method, a uniform wet film with a thickness of 30μm is coated with a film scraper. The film is then cured by a full-wave ultraviolet light source conveyor belt curing machine with the light source energy adjusted to 2000 mJ / cm2 and a curing speed of 10m / s to obtain the test sample.

[0085] Example 3

[0086] Raw materials:

[0087] Chlorinated polypropylene (CPP) (526P), Nippon Paper Manufacturing Co., Ltd.

[0088] Polyurethane acrylate (RY2203) industrial grade, Jiangsu Kailin Ruiyang Chemical Co., Ltd.;

[0089] 2-Hydroxy-2-methyl-1-phenylpropanone (1173): Analytical grade, Tianjin Jiuri New Materials Co., Ltd.;

[0090] IBOOA (Isobornyl Acrylate): Industrial grade, Changxing Special Materials Co., Ltd.

[0091] 1,6-Hexanediol diacrylate (HDDA) industrial grade, Changxing Special Materials Co., Ltd.

[0092] Hostatint Clariant Pigments (Clariant Chemicals (China) Co., Ltd.);

[0093] Table 3 UV-cured high-toughness, wear-resistant, color-identifying cable coating formulation

[0094]

[0095] Preparation steps:

[0096] 1. Preparation of adhesion promoter solution: Weigh isobornyl acrylate IBOA and chlorinated polypropylene 526P according to the mass ratio in Table 1, heat to 80℃, and stir evenly to obtain a mixed solution of adhesion promoter.

[0097] 2. Weigh the following components according to the mass ratio in Table 3: UV-curable matrix resin; HDDA (first reactive diluent); 1.5 parts of photoinitiator 1173; chlorinated polypropylene and isoborneol acrylate solution; 1 part of Hostatint Clariant color paste; and IBOA (isoborneol acrylate). Mix them thoroughly using a high-speed dispersant at 2600 rpm for 3 minutes.

[0098] 3. A uniform wet film with a thickness of 300μm was coated using a spray coating method. The sample was then cured by a full-wave ultraviolet light source in a conveyor belt curing machine with the light source energy adjusted to 2000 mJ / cm2 at a speed of 5m / s.

[0099] Example 4

[0100] Raw materials:

[0101] Chlorinated polypropylene (CPP) (526P): Nippon Paper Industries;

[0102] Polyurethane acrylate (RY2203) industrial grade: Jiangsu Kailin Ruiyang Chemical Co., Ltd.;

[0103] Phenylacetylbis(2,4,6-trimethylbenzoyl)phosphine oxide 819: analytical grade, Tianjin Jiuri New Material Co., Ltd.;

[0104] IBOOA (Isobornyl Acrylate): Industrial grade, Changxing Special Materials Co., Ltd.

[0105] 1,6-Hexanediol diacrylate (HDDA): Industrial grade, Changxing Special Materials Co., Ltd.;

[0106] Hostatint Clariant Pigments (Clariant Chemicals (China) Co., Ltd.);

[0107] Table 4 UV-cured high-toughness, wear-resistant, color-identification cable coating formulation

[0108]

[0109] Preparation steps:

[0110] 1. Preparation of adhesion promoter solution: Weigh isobornyl acrylate IBOA and chlorinated polypropylene 526P according to the mass ratio in Table 1, heat to 80℃, and stir evenly to obtain a mixed solution of adhesion promoter.

[0111] 2. Weigh the following components according to the mass ratio in Table 4: UV-curable matrix resin; HDDA (first reactive diluent); 1.5 parts of photoinitiator 819; chlorinated polypropylene and isobornyl acrylate solution; 2 parts of Hostatint Clariant color paste; and IBOA (isobornyl acrylate). Mix them thoroughly using a high-speed dispersant at 2600 rpm for 3 minutes.

[0112] 3. Using a scraping method, a uniform wet film with a thickness of 300μm is coated. The sample is then cured by a full-wave ultraviolet light source conveyor belt curing machine with the light source energy adjusted to 2500mJ / cm2 and a curing speed of 5m / s to obtain the test sample.

[0113] Example 5

[0114] Raw materials:

[0115] Chlorinated polypropylene (CPP) (526P): Nippon Paper Industries;

[0116] Polyurethane acrylate (6165) Industrial Grade: Changxing Special Materials Co., Ltd.;

[0117] Phenylacetylbis(2,4,6-trimethylbenzoyl)phosphine oxide 819: analytical grade, Tianjin Jiuri New Material Co., Ltd.;

[0118] IBOOA (Isobornyl Acrylate): Industrial grade, Changxing Special Materials Co., Ltd.

[0119] 1,6-Hexanediol diacrylate (HDDA): Industrial grade, Changxing Special Materials Co., Ltd.;

[0120] Hostatint Clariant Pigment: Clariant Chemicals (China) Co., Ltd.;

[0121] Table 5 UV-cured high-toughness, wear-resistant, color-identification cable coating formulation

[0122]

[0123] Preparation steps:

[0124] 1. Preparation of adhesion promoter solution: Weigh isobornyl acrylate IBOA and chlorinated polypropylene 526P according to the mass ratio in Table 1, heat to 80℃, and stir evenly to obtain a mixed solution of adhesion promoter.

[0125] 2. Weigh out the following components according to the mass ratio in Table 5: 6165 photocurable matrix resin; HDDA first reactive diluent; 2 parts of photoinitiator 819; chlorinated polypropylene and isobornyl acrylate solution; 1 part Hostatint Clariant color paste; and IBOA isobornyl acrylate. Mix them with a high-speed dispersant at 2600 rpm for 20 minutes until homogeneous.

[0126] 3. A uniform wet film with a thickness of 300μm was coated using a spray coating method. The sample was then cured by a full-wave ultraviolet light source in a conveyor belt curing machine with the light source energy adjusted to 2500mJ / cm2 and a curing speed of 5m / s.

[0127] Example 6

[0128] Raw materials:

[0129] Chlorinated polypropylene (CPP) (526P): Nippon Paper Industries;

[0130] 2-Hydroxy-2-methyl-1-phenylpropanone (1173): Analytical grade, Tianjin Jiuri New Material Co., Ltd.

[0131] IBOOA (Isobornyl Acrylate): Industrial grade, Changxing Special Materials Co., Ltd.

[0132] 1,6-Hexanediol diacrylate (HDDA): Industrial grade, Changxing Special Materials Co., Ltd.;

[0133] Hostatint Clariant Pigment: Clariant Chemicals (China) Co., Ltd.;

[0134] Table 6 UV-cured high-toughness, wear-resistant, color-identification cable coating formulation

[0135]

[0136] Preparation steps:

[0137] 1. Preparation of adhesion promoter solution: Weigh isobornyl acrylate IBOA and chlorinated polypropylene 526P according to the mass ratio in Table 1, heat to 80℃, and stir evenly to obtain a mixed solution of adhesion promoter.

[0138] 2. Weigh the following components according to the mass ratio in Table 6: UV-curable matrix resin; HDDA (first reactive diluent); 2 parts of photoinitiator 1173; chlorinated polypropylene and isoborneol acrylate solution; 1 part of Hostatint Clariant color paste; and IBOA (isoborneol acrylate). Mix them thoroughly using a high-speed dispersant at 2600 rpm for 10 minutes.

[0139] 3. Using a film scraper, coat a uniform wet film with a thickness of 200μm. Then, use a full-wave UV light source on a conveyor belt curing machine, adjusting the light source energy to 2500mJ / cm². 2 The test sample was obtained by curing the light source at a speed of 10 m / s.

[0140] Example Test Result Analysis:

[0141] The basic properties of the coatings prepared from the coating compositions of Examples 1-6 were tested using the methods described above. The test results are shown in Tables 7 and 8. Figure 7 .

[0142] The transparent and colored coatings prepared in the examples exhibit good wear resistance; after a 300g load and 500 cycles of steel wool friction, no scratches are observed on the surface. The coatings can be prepared by scraping, curtain coating, and spraying. The red, yellow, and blue coatings can achieve a single-stage UV-cured thickness of 300μm. The coating hardness is between 2B and HB, and it has a 0-level adhesion rating. The coatings have high weather resistance, with weathering tests exceeding 1000 hours showing no peeling, cracking, or hardening. Tensile property tests show an elongation at break between 150% and 220%. The film-forming process releases no VOCs, making it more environmentally friendly; it also features rapid curing, wear resistance, good toughness, resistance to high and low temperatures, and weather resistance without cracking.

[0143] The prepared coating composition system exhibits good overall compatibility, excellent wetting properties, uniform mixing, and good storage stability. It can be directly applied to PVC substrates and shows no shrinkage after curing. The coating film-forming process is simple and can be achieved through scraping, curtain coating, and spraying, requiring minimal equipment and is compatible with other equipment used in industrial production.

[0144] Table 7 Comparison of UV-curable coating performance

[0145]

[0146] Table 8 Results of aging resistance test (see attached photos)

[0147]

[0148] The coating composition prepared in this application can be used to prepare coatings with color recognition function, solving the problem of applying photocuring technology in colored systems in the prior art. The examples section verifies the preparation of transparent, red, yellow, and blue coatings; in specific applications, different colors can be prepared by mixing different color pastes according to the requirements of the substrate, thereby preparing photocurable coatings of different colors.

[0149] In cable production, the extrusion molding process for color identification strips requires sophisticated equipment and incurs high costs for raw materials and equipment. A cable coating with anti-aging properties, high toughness, strong adhesion, high wear resistance, and color identification has been prepared using UV curing. This process is simple and fast, suitable for continuous industrial production lines. The cured coating is adaptable to various bending and deformation conditions of cables, while also exhibiting high wear resistance and high adhesion (Level 0 adhesion). Different colors can be formulated according to the actual needs of the cable, and it also possesses excellent aging resistance.

[0150] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. The application of a photocurable coating composition in cable coating, characterized in that, The cable substrate is PVC or PP; the composition is used to prepare a solvent-removable color recognition coating; The composition comprises the following raw materials in parts by weight: 50-70 parts of UV-curable matrix resin; 20-30 parts of the first reactive diluent; 1-2 parts of photoinitiator; 1-3 parts of UV-curable colorant; Chlorinated polypropylene 4-7.5 parts, wherein the chlorinated polypropylene contains not less than 24% chlorine; 25-42 parts of the second reactive diluent; The chlorinated polypropylene is pre-dissolved in a second reactive diluent to form mixture A; The method for preparing the composition includes steps S11 and S12: S11; Weigh out a portion of the second reactive diluent and chlorinated polypropylene, mix them, heat to 50-80℃, and stir until homogeneous to obtain mixture A; S12; Weigh out the light-curing matrix resin, the first reactive diluent, the photoinitiator, mixture A, the light-curing special color paste, and the remaining second reactive diluent, and mix them evenly; The second reactive diluent is selected from one or a combination of isoborneol acrylate and isoborneol methacrylate; The first reactive diluent is selected from one or a combination of 1,6-hexanediol diacrylate, dipropylene glycol acrylate, tripropylene glycol acrylate, 1,6-hexanediol dimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, dipropylene glycol acrylate, and tripropylene glycol triacrylate.

2. The application of the photocurable coating composition as described in claim 1 in cable coating, characterized in that, The photocurable matrix resin is a polyether-type polyurethane oligomer resin or a polyester-type polyurethane oligomer resin, with a functionality of 2-4.

3. The application of the photocurable coating composition as described in claim 1 in cable coating, characterized in that, The method for preparing the coating includes steps S21 and S22: S21: A uniform wet film is formed by spraying, scraping, or spraying. S22: UV curing or electron beam curing.

4. The application of the photocurable coating composition as described in claim 3 in cable coating, characterized in that, In step S21, the thickness of the wet film is 30-300 μm.

5. The application of the photocurable coating composition as described in claim 3 in cable coating, characterized in that, In step S22, the energy of the ultraviolet curing light source is 2000-2500 mJ / cm². 2 The speed is 5.5-10 m / s.

6. The application of the photocurable coating composition as described in claim 1 in cable coating, characterized in that, The coating can be removed by at least one solvent selected from ethanol, acetone, or ethyl acetate.

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