Jet printing type coating liquid as well as preparation method and application thereof

Abstract

The invention relates to the field of polymer coating materials, and particularly discloses a jet printing type coating liquid, a preparation method and application, and the jet printing type coating liquid comprises the following components in parts by weight: 5-20 parts of phenolic epoxy acrylic resin, 5-10 parts of polyester acrylate, 40-70 parts of an active monomer, 5-10 parts of an initiator, 0.5-2 parts of a pigment and 1-5 parts of an auxiliary agent. Based on the jet printing type coating liquid, jet printing is carried out on the surface of a metal material of a machined part, and after the jet printing type coating liquid is cured, a tough and wear-resistant film layer is formed, so that different performances of the product surface of the machined part are improved to meet corresponding performance requirements.

Description

Technical Field

[0001] The invention relates to the field of polymer coating materials, and in particular to a jet-printing coating liquid, a preparation method and an application thereof. Background Art

[0002] In the precision processing of high-end alloy components in the 3C electronics industry, there are extremely high performance requirements for the ink or coating layer coated on the product surface, such as solvent resistance, aging resistance, friction resistance, scratch resistance and other properties.

[0003] However, due to these high-performance requirements, the current related processing technologies are difficult to fully meet these needs, and the processed ink or coating layer often cannot meet the preset performance requirements. During the transportation and use of high-end alloy component products, once they encounter accidental collisions or chemical contamination, the ink or coating layer is prone to fall off or surface corrosion, which will cause the product to be unusable or its performance to be seriously affected.

[0004] Therefore, it is necessary to provide a coating liquid that meets high performance requirements such as solvent resistance, aging resistance, friction resistance, scratch resistance, etc., and is suitable for workpiece printing. Summary of the invention

[0005] The present invention provides a spray-printing type coating liquid, a preparation method and an application, aiming to provide a coating liquid that meets high performance requirements such as solvent resistance, aging resistance, friction resistance, scratch resistance, etc. and is suitable for spray printing on workpieces.

[0006] In the first aspect, a jet printing type coating liquid is proposed, which includes, by weight: 5 to 20 parts of phenolic epoxy acrylate resin, 5 to 10 parts of polyester acrylate, 40 to 70 parts of active monomer, 5 to 10 parts of initiator, 0.5 to 2 parts of pigment, and 1 to 5 parts of auxiliary agent.

[0007] In some embodiments, the preparation method of the novolac epoxy acrylic resin comprises the following steps:

[0008] S1, adding phenolic epoxy resin, catalyst, and polymerization inhibitor into a reactor and mixing to obtain a first mixture;

[0009] S2, heating the first mixture to a first temperature, and adding a first mixed liquid to the first mixture at the first temperature to obtain a second mixture, wherein the first mixed liquid includes acrylic acid and 3,7-dimethyl-6-octenoic acid;

[0010] S3, heating the second mixture to a second temperature, and maintaining the second mixture at the second temperature for a preset time to obtain a novolac epoxy acrylic resin.

[0011] In some embodiments, in step S2, the first temperature is 100° C.-120° C.; and / or,

[0012] In step S3, the second temperature is 110°C-130°C, and the preset time is 2h-4h.

[0013] In some embodiments, in the novolac epoxy acrylic resin, the mass ratio of the novolac epoxy resin to the acrylic acid and 3,7-dimethyl-6-octenic acid in the first mixed solution is 100:(20 to 40):(80 to 120) in parts by weight.

[0014] In some embodiments, the catalyst is one of N,N-dimethylbenzylamine, triethanolamine, and triphenylphosphine;

[0015] The amount of the catalyst is 0.3%-0.6% of the mass of the phenolic epoxy resin; and or,

[0016] The polymerization inhibitor is one of p-hydroxyanisole, o-methylhydroquinone, p-benzoquinone and hydroquinone.

[0017] In some embodiments, the polyester acrylate is one of a 2-5 functional polyester and an acrylate;

[0018] The viscosity of the polyester acrylate is in the range of 60-1000 mPa.s.

[0019] In some embodiments, the active monomer is at least one of isobornyl methacrylate, isobornyl acrylate, pentaerythritol tetraacrylate, ethoxy acrylate, 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, ethoxylated trimethylolpropane triacrylate, hydroxyethyl acrylate, 2-ethylacryloyloxymethyl phosphate, and hydroxyethyl acrylate phosphate.

[0020] In some embodiments, the initiator is at least one of TMO, 1173, 184, TPO, ITX, 819, 907; and / or,

[0021] The pigment is at least one of blue pigment phthalocyanine blue, titanium dioxide, phthalocyanine green, iron oxide red, carmine, toluidine red, and carbon black; and / or,

[0022] The auxiliary agent is one of a defoamer, a silane coupling agent and a leveling agent.

[0023] In a second aspect, the present invention also proposes a method for preparing a jet-printable coating liquid, which comprises: mixing phenolic epoxy acrylate resin, polyester acrylate and active monomer, and then adding an initiator, a pigment and an auxiliary agent to the mixed mixture to obtain the inkjet printing oil.

[0024] In a third aspect, the present invention further proposes an application of a jet-printing coating liquid, wherein the jet-printing coating liquid can be used in a jet-printing system, and the steps of applying the jet-printing coating liquid may include:

[0025] Receiving control electrical signals;

[0026] In response to the control electrical signal, the printing type coating liquid layer placed in the material storage box is sprayed onto the surface of the processing component to print the processing component.

[0027] In an embodiment of the present invention, a printing type coating liquid can be used to print on the metal material surface of a processing part. After the printing type coating liquid is cured, a tough and wear-resistant film layer is formed, thereby improving the different properties of the product surface of the processing part to meet the corresponding performance requirements. In parts by weight, the printing type coating liquid includes 5 to 20 parts of phenolic epoxy acrylic resin, 5 to 10 parts of polyester acrylate, 40 to 70 parts of active monomers, 5 to 10 parts of initiators, 0.5 to 2 parts of pigments, and 1 to 5 parts of additives.

[0028] The beneficial effects of the present invention are: solving the problem of poor adhesion of ink or coating layer on the surface of metal material, improving the adhesion of coating, reducing the shedding and corrosion caused by collision or chemical pollution during transportation and use. It overcomes the problem of low material utilization rate in traditional silk screen printing or spraying, improves the efficiency of material use, reduces costs and energy consumption for precision machining of alloy parts, and helps to achieve energy conservation, emission reduction and sustainable development. DETAILED DESCRIPTION

[0029] The scheme in the embodiment of the present invention will be described clearly and completely below. Obviously, the described embodiment is only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein may be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein may be implemented independently of any other aspect, and two or more of these aspects may be combined in various ways. For example, any number of aspects described herein may be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein may be used to implement this device and / or practice this method.

[0031] The first aspect of the present invention provides a jet printing type coating liquid, which comprises, by weight: 5 to 20 parts of phenolic epoxy acrylic resin, 5 to 10 parts of polyester acrylate, 40 to 70 parts of active monomers, 5 to 10 parts of initiators, 0.5 to 2 parts of pigments, and 1 to 5 parts of additives.

[0032] For example, assuming that 100 portions of a jet printing type coating liquid are prepared, the following is a possible formulation composition:

[0033] 10 parts of phenolic epoxy acrylic resin can be selected. The proportion of phenolic epoxy acrylic resin is relatively moderate, which can provide a certain hardness, adhesion and chemical resistance for the coating. 8 parts of polyester acrylate are selected. The content of polyester acrylate in the formula is appropriate, which helps to increase the flexibility and weather resistance of the coating. The active monomer is a combination of 55 parts of isobornyl methacrylate, isobornyl acrylate, etc., which provides a basis for the curing and performance adjustment of the coating. 8 parts of TPO are selected as the initiator to effectively initiate the polymerization reaction and ensure the curing effect of the coating. 1 part of phthalocyanine blue is selected as the pigment to give the coating a specific color. Additives include defoamers and leveling agents, 3 parts of which are selected to improve the construction performance and surface effect of the coating.

[0034] Through such a formula combination, the various ingredients work synergistically with each other to eventually form a printing-type coating liquid with good performance, which meets the requirements of solvent resistance, aging resistance, friction resistance, scratch resistance, etc., and is suitable for printing on various workpieces.

[0035] The phenolic epoxy acrylic resin in the inkjet coating liquid provided by the present invention can provide good adhesion, hardness and chemical resistance, enhance the bonding force between the coating and the substrate, make the coating have higher mechanical strength and chemical corrosion resistance, and help to improve the durability of the coating.

[0036] The polyester acrylate in the inkjet coating liquid can improve flexibility and weather resistance, increase the elasticity and impact resistance of the coating while maintaining a certain hardness, and improve its stability under different environmental conditions.

[0037] The active monomers in the inkjet coating liquid can participate in the polymerization reaction, adjust the performance of the coating, and control the viscosity, curing speed and cross-linking density of the coating, thereby affecting the construction performance and final physical and chemical properties of the coating.

[0038] The initiator in the inkjet coating liquid can trigger a polymerization reaction, promote the curing of the coating, decompose under appropriate conditions to produce free radicals, start the polymerization process of the resin and monomer, and transform the coating from liquid to solid.

[0039] The pigments in the inkjet coating liquid can give the coating color and hiding power, provide the coating with specific colors according to needs, and provide a certain hiding effect to meet the requirements of decoration or identification.

[0040] The additives in the inkjet coating liquid can improve the overall performance of the coating. The additives may include leveling agents (to improve the flatness of the coating), defoaming agents (to reduce bubble generation), dispersants (to evenly disperse pigments and other ingredients), etc., which help to improve the appearance quality, stability and construction performance of the coating.

[0041] The various components in the inkjet coating liquid provided by the present invention cooperate with each other and work together to achieve the high performance requirements of the inkjet coating liquid such as solvent resistance, aging resistance, friction resistance, scratch resistance, etc., while ensuring good inkjet printing effect and construction performance.

[0042] In some embodiments of the present invention, the inkjet coating liquid includes a novolac epoxy acrylic resin, and the preparation method of the novolac epoxy acrylic resin may include the following steps:

[0043] S1. Add phenolic epoxy resin, catalyst and polymerization inhibitor into a reactor and mix them to obtain a first mixture.

[0044] In step S1, epoxy novolac resin, catalyst and polymerization inhibitor are added to a reactor for mixing to form a first mixture. Epoxy novolac resin is the main raw material of the reaction, the catalyst is used to accelerate the reaction and increase the reaction rate, and the polymerization inhibitor is used to prevent the reaction from polymerizing prematurely to ensure the controllability of the reaction.

[0045] S2. Heating the first mixture to a first temperature, and adding a first mixed liquid to the first mixture at the first temperature to obtain a second mixture, wherein the first mixed liquid includes acrylic acid and 3,7-dimethyl-6-octenoic acid.

[0046] In step S2, the first mixture is heated to a first temperature, and then under this temperature condition, a first mixed solution containing acrylic acid and 3,7-dimethyl-6-octenoic acid is added to the first mixture to obtain a second mixture. In this process, the first temperature is set to create a suitable reaction environment so that the added first mixed solution can fully contact and react with the components in the first mixture.

[0047] S3, heating the second mixture to a second temperature, and maintaining the second mixture at the second temperature for a preset time to obtain a novolac epoxy acrylic resin.

[0048] In step S3, the second mixture is further heated to a second temperature and maintained at this temperature for a preset time, thereby promoting the reaction to proceed fully and allowing a sufficient chemical reaction to occur between the various components, and finally obtaining the desired novolac epoxy acrylic resin.

[0049] It should be noted that the above scheme achieves the conversion from the initial raw material to the final phenolic epoxy acrylic resin by precisely controlling the temperature, addition order and reaction time, thereby providing a key component with specific properties for the inkjet coating liquid.

[0050] In some embodiments of the present invention, in step S2, the first temperature is 100°C-120°C; and / or, in step S3, the second temperature is 110°C-130°C, and the preset time is 2h-4h.

[0051] It should be noted that in step S2, the first mixture is heated to a temperature in the range of 100°C-120°C. Within this temperature range, the first mixed solution (comprising acrylic acid and 3,7-dimethyl-6-octenoic acid) added later is conducive to the preliminary reaction with the components in the first mixture. The selection of the temperature within this range can ensure that the reaction is started at an appropriate rate, which can avoid the reaction being too slow due to too low a temperature, and can also prevent the unnecessary side reactions or too fast polymerization caused by too high a temperature.

[0052] In step S3, the second mixture is heated to a second temperature range of 110°C-130°C and maintained for a reaction time of 2h-4h. The higher second temperature range is conducive to the in-depth progress and completion of the reaction, and the reaction time of 2h-4h can ensure sufficient reaction time for each component to fully transform them, thereby ensuring that the final phenolic epoxy acrylic resin has the expected performance and structure. If the temperature is too low or the time is too short, the reaction may not be complete, affecting the performance of the resin; if the temperature is too high or the time is too long, it may cause the performance of the resin to decline or produce unnecessary impurities.

[0053] Exemplarily, in the preparation process of the novolac epoxy acrylic resin, in step S2, the first mixture can be heated to 110°C, and then the first mixed solution is added to the first mixture. At this time, at this temperature, the components begin to react initially, and the reaction proceeds relatively smoothly without violent heat release or other abnormal phenomena. In step S3, the second mixture is heated to 120°C and maintained at this temperature for 3 hours. During these 3 hours, the reaction is fully carried out. Through monitoring, it is found that the viscosity of the reaction system gradually increases, indicating that the degree of polymerization reaction is deepening, and finally a novolac epoxy acrylic resin that meets the requirements is prepared.

[0054] In some embodiments of the present invention, in the novolac epoxy acrylic resin, the mass ratio of the novolac epoxy resin to the acrylic acid and 3,7-dimethyl-6-octenic acid in the first mixed solution is 100:(20 to 40):(80 to 120) in parts by weight.

[0055] For example, assuming that the amount of the phenolic epoxy resin is 100 parts, the acrylic acid and 3,7-dimethyl-6-octenoic acid in the first mixed solution can be respectively: the amount of acrylic acid is in the range of 20 to 40 parts, such as 20 parts, 30 parts or 40 parts; the amount of 3,7-dimethyl-6-octenoic acid is in the range of 80 to 120 parts, such as 80 parts, 100 parts or 120 parts:

[0056] In step S2, the first mixture is heated to 100°C-120°C, and the first mixed solution in the specific proportion is added at this time, so that the epoxy novolac resin, acrylic acid and 3,7-dimethyl-6-octenic acid begin to react with the epoxy novolac resin at this temperature to obtain a second mixture.

[0057] Then in step S3, the second mixture is heated to 110-130°C and maintained for 2-4 hours. Under such conditions, due to the specific mass ratio of the components, they can react fully and effectively to finally generate a novolac epoxy acrylic resin with satisfactory performance.

[0058] For example, if the phenolic epoxy resin is 100 parts, the acrylic acid is 30 parts, and the 3,7-dimethyl-6-octenoic acid is 100 parts, and the reaction is carried out according to the above reaction temperature and time, it is possible to obtain a phenolic epoxy acrylic resin with ideal properties and structure, which provides a good foundation for the subsequent inkjet coating liquid.

[0059] In some embodiments of the present invention, the catalyst is one of N,N-dimethylbenzylamine, triethanolamine and triphenylphosphine, and the amount of the catalyst used is 0.3%-0.6% of the mass of the phenolic epoxy resin.

[0060] It should be noted that in some embodiments of the present invention, the catalyst used can be any one of N,N-dimethylbenzylamine, triethanolamine or triphenylphosphine. These catalysts play a key role in promoting the reaction. The amount of the catalyst has an important influence on the rate and effect of the reaction. In some embodiments of the present invention, the amount of the catalyst is 0.3-0.6% of the mass of the phenolic epoxy resin.

[0061] As an example, if the mass of the phenolic epoxy resin used is 100g, then when N,N-dimethylbenzylamine is selected as the catalyst, the amount of N,N-dimethylbenzylamine can be between 0.3g and 0.6g. For example, the amount of N,N-dimethylbenzylamine can be 0.3g, 0.45g or 0.6g.

[0062] As another example, if the mass of the epoxy novolac resin is 500 g, when triethanolamine is selected as the catalyst, the amount of triethanolamine may be between 1.5 g (500×0.3%) and 3 g (500×0.6%). For example, the amount of triethanolamine may be 2 g.

[0063] As another example, the mass of the phenolic epoxy resin is 800 g, and when triphenylphosphine is selected as the catalyst, the amount of triphenylphosphine can be between 2.4 g (800×0.3%) and 4.8 g (800×0.6%). For example, the amount of triphenylphosphine can be 3.5 g.

[0064] By controlling the catalyst (N, N-dimethylbenzylamine, triethanolamine, triphenylphosphine) within the range of 0.3%-0.6% of the mass of the novolac epoxy resin, the progress of the reaction can be effectively adjusted to ensure that the reaction proceeds efficiently and stably, thereby obtaining the desired novolac epoxy acrylic resin.

[0065] In some embodiments of the present invention, the polymerization inhibitor is one of p-hydroxyanisole, o-methylhydroquinone, p-benzoquinone, and hydroquinone.

[0066] It should be noted that polymerization inhibitors play an important role in chemical reactions. Their main function is to prevent monomers or active polymers in the reaction system from undergoing premature polymerization during storage, transportation or reaction.

[0067] Among them, p-hydroxyanisole has a good inhibitory effect and can effectively inhibit the occurrence of free radical polymerization. O-methylhydroquinone can also terminate the chain growth process that may lead to premature polymerization by reacting with free radicals. P-benzoquinone can quickly capture free radicals, prevent the polymerization reaction from proceeding, and ensure the controllability and stability of the reaction. Hydroquinone is also an effective inhibitor, which combines with active free radicals to make them inactive, thereby delaying or preventing the polymerization reaction.

[0068] The choice of one of these inhibitors can be determined based on the specific reaction conditions, the nature of the reactants and the process requirements. They can effectively ensure the smooth progress of the reaction during the preparation of the novolac epoxy acrylic resin, avoid unnecessary premature polymerization, and thus ensure the quality and performance of the final product.

[0069] In some embodiments of the present invention, the polyester acrylate is one of a polyester with 2-5 functionalities and an acrylate; and the viscosity of the polyester acrylate is in the range of 60-1000 mPa.s.

[0070] The polyester acrylate can be one of 2-5 functional polyesters or acrylates. 2-5 functionalities refer to the number of active groups in the molecule that can participate in the reaction. Different functionalities will affect the reactivity of the polyester acrylate and the final coating properties. For example, a 2-functional polyester acrylate may provide better flexibility and ductility in some cases, while a 5-functional polyester acrylate may enhance the crosslinking density and hardness of the coating.

[0071] In addition, the viscosity of the polyester acrylate is in the range of 60-1000mPa·s. Viscosity is an important parameter to measure the resistance to fluid flow. Polyester acrylate with a viscosity in the range of 60-1000mPa·s has moderate fluidity. If the viscosity is lower, such as close to 60mPa·s, it may be easier to disperse and flow in the coating liquid, which helps to form a uniform coating during the printing process, but may be relatively weak in hardness and wear resistance after curing. When the viscosity is higher, close to 1000mPa·s, its fluidity during printing will be relatively poor, but it may provide better mechanical strength and scratch resistance for the cured coating.

[0072] In practical applications, polyester acrylates with appropriate viscosity and functionality can be selected according to specific needs and process conditions to achieve the desired coating performance and printing effect. For example, for applications that require higher flexibility and uniform coating, polyester acrylates with lower viscosity and lower functionality can be selected; while for applications that require high hardness and wear resistance, types with higher viscosity and greater functionality may be preferred.

[0073] In some embodiments of the present invention, the active monomer is at least one of isobornyl methacrylate, isobornyl acrylate, pentaerythritol tetraacrylate, ethoxy acrylate, 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, ethoxylated trimethylolpropane triacrylate, hydroxyethyl acrylate, 2-ethylacryloyloxymethyl phosphate, and hydroxyethyl acrylate phosphate.

[0074] Among them, the active monomers can participate in the polymerization reaction in the inkjet coating liquid, thereby affecting the performance of the coating. Isobornyl methacrylate has a unique spatial structure, which can give the coating good hardness, weather resistance and chemical resistance. Isobornyl acrylate can also improve the performance of the coating, such as increasing its flexibility and gloss. Pentaerythritol tetraacrylate can significantly increase the crosslinking density of the coating due to its multiple functional groups, thereby enhancing the mechanical properties and resistance of the coating. Ethoxy acrylate can adjust the viscosity and flexibility of the coating. 1,6-Hexanediol diacrylate helps to improve the adhesion and wear resistance of the coating. Dipropylene glycol diacrylate can improve the flexibility and water resistance of the coating. Ethoxylated trimethylolpropane triacrylate can increase the curing speed and hardness of the coating. Hydroxyethyl acrylate can provide good adhesion and moisture resistance. 2-Ethylacryloyloxymethyl phosphate and hydroxyethyl acrylate phosphate can enhance the corrosion resistance and adhesion of the coating.

[0075] In practical applications, one or more of the above-mentioned active monomers can be selected for combination according to specific needs and performance requirements.

[0076] For example, if you need to prepare a coating with high hardness and weather resistance, you can choose to combine active monomers such as isobornyl methacrylate and pentaerythritol tetraacrylate. If you pay more attention to the flexibility and water resistance of the coating, you may choose ethoxy acrylate, dipropylene glycol diacrylate, etc. By reasonably selecting and matching these active monomers, the performance of the inkjet coating liquid can be precisely adjusted to meet the needs of different application scenarios.

[0077] In some embodiments of the present invention, the initiator is at least one of TMO, 1173, 184, TPO, ITX, 819, 907.

[0078] Among them, TMO (2,4,6-trimethylbenzoyl) di (p-tolyl) phosphine oxide) has a specific chemical structure and reactivity, which can effectively initiate the polymerization process and provide the starting power for the formation of the coating. 1173 (2-hydroxy-2-methyl-1-phenyl-1-propanone) is a common and efficient photoinitiator. It can quickly generate free radicals under the irradiation of light of a specific wavelength to initiate the polymerization reaction of monomers and resins. 184 (1-hydroxycyclohexyl phenyl ketone) is also a photoinitiator with good absorption and response capabilities to ultraviolet rays, which can promote the rapid curing of the coating. TPO (2,4,6-trimethylbenzoyl-diphenyl phosphine oxide) has high initiation efficiency and stability and can work in a wide wavelength range. ITX (isopropylthioxanthone) is an effective free radical photoinitiator with good applicability for certain specific coating systems. 819 (bis (2,4,6-trimethylbenzoyl) phenyl phosphine oxide) has excellent initiation performance and light stability, which can ensure the quality and performance of the coating during the curing process. 907 (2-methyl-4'-(methylthio)-2-morpholinopropiophenone) is also a commonly used photoinitiator, which can initiate polymerization under appropriate conditions to achieve coating curing.

[0079] In some embodiments of the present invention, the pigment is at least one of the blue pigments phthalocyanine blue, titanium dioxide, phthalocyanine green, iron oxide red, carmine, toluidine red, and carbon black.

[0080] In practical applications, one or more of the above pigments can be selected and combined according to the desired color effect and coating performance requirements.

[0081] In some embodiments of the present invention, the auxiliary agent is one of a defoaming agent, a silane coupling agent, and a leveling agent.

[0082] Among them, the main function of the defoamer is to eliminate the bubbles generated during the production, mixing, and construction of the coating liquid. If these bubbles are not eliminated, they will form defects such as holes and depressions after the coating is cured, affecting the appearance and protective performance of the coating. Defoamers are usually substances with low surface tension that can quickly diffuse to the surface of the bubbles, reduce the strength of the bubble film, and cause the bubbles to burst. For example, silicone defoamers can effectively inhibit the generation and stability of bubbles, ensuring that the coating surface is smooth.

[0083] Silane coupling agent is an additive that can enhance the bonding strength between the coating and the substrate. One end of its molecular structure can chemically react with the hydroxyl group and other groups on the surface of the inorganic substrate to form a strong chemical bond; the other end can interact with the resin molecules in the organic coating to establish a good connection between the two. This helps to improve the adhesion, corrosion resistance and durability of the coating. Common silane coupling agents include aminosilane, epoxysilane, etc., which can be selected according to the properties of the substrate and the requirements of the coating.

[0084] The function of leveling agent is to improve the leveling performance of coating liquid during construction. When coating liquid is applied on the substrate, due to the difference in surface tension, uneven leveling and orange peel may occur. Leveling agent can reduce the surface tension of coating liquid, promote the uniform flow of coating liquid, and form a flat and smooth surface before curing. Different types of leveling agents, such as acrylic leveling agents and silicone leveling agents, have different characteristics and applicable ranges, and can be selected according to the coating system and construction conditions.

[0085] The second aspect of the present invention provides a method for preparing the inkjet-printing type coating liquid involved in the first aspect of the present invention, and the method for preparing the inkjet-printing type coating liquid may include the following steps:

[0086] The phenolic epoxy acrylic resin, polyester acrylate and active monomer are mixed, and then an initiator, a pigment and an auxiliary agent are added to the mixed mixture to obtain the inkjet printing oil.

[0087] First, the phenolic epoxy acrylate resin, polyester acrylate and active monomer are mixed. As the main film-forming substance, the phenolic epoxy acrylate resin provides the coating with good adhesion, chemical resistance and hardness. Polyester acrylate can improve the flexibility and weather resistance of the coating. The active monomer participates in the polymerization reaction and adjusts the performance and curing speed of the coating.

[0088] During this initial mixing stage, you need to ensure that the three main ingredients are evenly dispersed and form a stable base mixture, which can lay a good foundation for the subsequent addition of other ingredients.

[0089] Then, initiators, pigments and additives are added to the mixed mixture.

[0090] Among them, the initiator is added to start the polymerization reaction, so that it can promote the cross-linking and curing of the resin and monomer under appropriate conditions to form a solid coating structure. Different initiators (such as TMO, 1173, etc.) have different initiation activities and applicable conditions, and need to be selected and added according to the specific formula and process requirements. The addition of pigments gives the coating a specific color and hiding power. According to the required color effect (such as blue phthalocyanine blue, white titanium dioxide, etc.), the type and amount of pigments are precisely controlled to achieve the ideal visual effect. The addition of additives is to further optimize the performance of the coating. Defoamers can eliminate bubbles generated during stirring and mixing to ensure the flatness of the coating; silane coupling agents enhance the adhesion of the coating to the substrate; leveling agents improve the leveling of the coating, making its surface smoother and more uniform.

[0091] In the whole preparation process, the order of addition and stirring conditions of each step have an important influence on the performance of the final coating liquid. By strictly controlling the addition amount of each component, stirring speed and time, and reaction temperature and other parameters, it is possible to prepare a printing type coating liquid with excellent performance that meets various needs.

[0092] For example, in actual operation, if a blue coating liquid with high weather resistance needs to be prepared, the appropriate amount of phenolic epoxy acrylic resin, polyester acrylate and specific reactive monomer can be fully mixed first, and then a suitable initiator can be added to ensure rapid curing under the conditions of use. Then, the blue pigment phthalocyanine blue is accurately added to obtain the required color depth, and the appropriate amount of defoamer, silane coupling agent and leveling agent are added to eliminate possible bubbles, enhance the bonding strength with the substrate, and make the coating surface smoother.

[0093] Therefore, the preparation method of the inkjet coating liquid provided by the present invention improves the utilization rate of materials and reduces the energy consumption of processing the alloy parts on the basis of achieving the preset performance requirements of the alloy parts after inkjet processing, overcomes the problem of low material utilization rate in traditional silk screen printing or spraying methods, improves the efficiency of material use, reduces costs and energy consumption for precision processing of alloy parts, and helps to achieve energy conservation and emission reduction and sustainable development.

[0094] The third aspect of the present invention provides the use of the inkjet printing type coating liquid involved in the first aspect of the present invention, and the steps of applying the inkjet printing type coating liquid may include:

[0095] Receiving control electrical signals;

[0096] In response to the control electrical signal, the printing type coating liquid layer placed in the material storage box is sprayed onto the surface of the processing component to print the processing component.

[0097] The first step is to receive the control electrical signal. This electrical signal is generated by a computer and contains extremely detailed and precise instruction information. It not only includes the specific design details of the text, pattern or graphic to be printed, but also specifies many subtle but critical parameters such as color selection, line thickness, printing position and angle, etc.

[0098] Then, in response to the received control electrical signal, the printing operation starts. The prepared printing coating liquid is placed in the storage box, waiting to be accurately printed on the surface of the processed part. The coating liquid in the storage box has been carefully formulated. Phenolic epoxy acrylic resin gives the coating excellent adhesion, solvent resistance and aging resistance, ensuring that it can adhere firmly to the surface of substrates such as aluminum alloy or stainless steel, and is not easy to fall off or deteriorate after long-term use. The presence of polyester acrylate increases the flexibility of the coating, allowing it to withstand a certain degree of deformation without breaking. Active monomers participate in the polymerization reaction, further optimizing the cross-linking structure and physical properties of the coating. When the initiator receives the curing signal, it can quickly initiate the reaction to cure the coating. The pigment provides a bright and lasting color, and the additives play an important role in defoaming, enhancing adhesion and improving leveling.

[0099] During the printing process, the coating liquid is sprayed out in the form of tiny and uniform droplets using advanced IJP high-precision printing equipment. These droplets are precisely deposited on the surface of substrates such as aluminum alloy or stainless steel according to the instructions of the control electrical signal, forming text, patterns or graphics that are completely consistent with the design.

[0100] After the printing is completed, it is cured. First, functional ink or coating paint is printed again on the printed coating to enhance its specific functions, such as wear resistance and corrosion resistance. Then, a 395nm LED curing lamp is used for UV light curing, and the curing energy is controlled at 800-1600mj / cm 2 Such curing conditions can ensure that the coating is fully cross-linked and cured to achieve ideal performance indicators such as hardness, adhesion and chemical resistance. The final coating with a total thickness of 20-80um can provide sufficient protection and decorative effects without being too thick to affect the performance and appearance of the parts. In this way, combined with high-performance inkjet coating liquid and optimized inkjet and curing processes, high-quality, high-precision and high-performance inkjet processing of processed parts can be achieved, meeting the high-performance requirements of various high-end application fields.

[0101] In other embodiments, after performing the step of applying the inkjet coating liquid, the inkjet coating liquid application step can also be used to perform a performance test on the inkjet coating liquid, and the specific test contents are as follows:

[0102] 1. Adhesion test

[0103] The purpose of using a grid knife to vertically scratch the sample surface is to simulate the scratching and peeling that the coating may suffer in actual use. Scratching out 10x10 small grids of 1mm×1mm can comprehensively and carefully evaluate the degree of adhesion between the coating and the substrate. Then, use 3M 600 tape to stick and rub hard to ensure that the tape is tightly bonded to the coating to simulate the possible adhesion effect in reality. Quickly lift the free end of the tape at a 45-degree angle and repeat the test three times at different positions, so that the consistency and stability of the coating adhesion can be more accurately evaluated. If the adhesion of the coating reaches or exceeds the 4B level, it means that the coating has excellent adhesion performance, can maintain firm adhesion under various conditions of use, and is not easy to peel off.

[0104] 2. Friction Test

[0105] A special anti-friction rubber and a 300-gram weight are used to simulate the coating under certain pressure and frequent friction. The sample surface is wiped back and forth for 100 cycles at a speed of 40 to 60 times per minute and a stroke of about 20 mm. This high-intensity friction test can truly reflect the wear resistance of the coating in long-term use. If the ink does not penetrate the bottom and does not change color after the test, it means that the coating has good wear resistance and can withstand frequent friction and maintain its appearance and performance.

[0106] 3. Moisture and heat resistance test

[0107] The sample is placed in an environment with a constant high temperature of 60°C and a humidity of 80% for 24 hours, simulating extreme hot and humid conditions. Such conditions may cause the coating to swell, soften, or lose adhesion. After that, it is returned to room temperature of 25°C for 2 hours to observe whether the coating wrinkles or falls off. If the coating remains intact after such a harsh environment test, without wrinkling or falling off, it indicates that it has good resistance to moisture and heat and can work stably in a high temperature and high humidity environment.

[0108] 4. Corrosion resistance test

[0109] Refer to the standard GB / T10125-1997 for a 24-hour salt spray test. Salt spray contains a lot of salt and moisture, which is highly corrosive. If the coating remains unchanged and does not fall off in such an environment, it means that the coating has excellent corrosion resistance and can effectively protect the substrate in a humid and salty harsh environment.

[0110] For example, for the inkjet coating liquid used on automotive parts, if all the performance tests meet the requirements, it can ensure that the coating can always maintain good performance and protect the parts and maintain their beautiful appearance during the driving process, regardless of the friction from sand and gravel on the road, the climate differences in different regions, or the corrosive substances that may be exposed.

[0111] Therefore, these performance tests are comprehensive and rigorous, and can effectively evaluate the performance of inkjet coating fluids under various harsh conditions, providing reliable quality assurance for their practical applications.

[0112] The insulating coating formed by ink jet printing provided by the present invention has good adhesion on the substrate, and the obtained insulating material meets the insulation requirements and has excellent wear resistance, acid and alkali resistance, and high temperature and humidity resistance.

[0113] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A jet printing coating liquid, characterized in that: The inkjet coating liquid comprises, by weight: 5 to 20 parts of phenolic epoxy acrylic resin, 5 to 10 parts of polyester acrylate, 40 to 70 parts of active monomer, 5 to 10 parts of initiator, 0.5 to 2 parts of pigment and 1 to 5 parts of auxiliary agent.

2. The inkjet coating liquid according to claim 1, characterized in that: The preparation method of the phenolic epoxy acrylic resin comprises the following steps: S1, adding phenolic epoxy resin, catalyst, and polymerization inhibitor into a reactor and mixing to obtain a first mixture; S2, heating the first mixture to a first temperature, and adding a first mixed liquid to the first mixture at the first temperature to obtain a second mixture, wherein the first mixed liquid includes acrylic acid and 3,7-dimethyl-6-octenoic acid; S3, heating the second mixture to a second temperature, and maintaining the second mixture at the second temperature for a preset time to obtain a novolac epoxy acrylic resin.

3. The inkjet coating liquid according to claim 2, characterized in that: In step S2, the first temperature is 100°C-120°C; and / or, In step S3, the second temperature is 110°C-130°C, and the preset time is 2h-4h.

4. The inkjet printing type coating liquid according to claim 2, characterized in that: In parts by weight, the mass ratio of the novolac epoxy acrylic resin to the acrylic acid and 3,7-dimethyl-6-octenic acid in the first mixed solution is 100:(20 to 40):(80 to 120).

5. The inkjet coating liquid according to claim 3, characterized in that: The catalyst is one of N,N-dimethylbenzylamine, triethanolamine and triphenylphosphine; The amount of the catalyst is 0.3%-0.6% of the mass of the phenolic epoxy resin; and or, The polymerization inhibitor is one of p-hydroxyanisole, o-methylhydroquinone, p-benzoquinone and hydroquinone.

6. The inkjet printing type coating liquid according to claim 1, characterized in that: The polyester acrylate is one of 2-5 functional polyester acrylates; The viscosity of the polyester acrylate is in the range of 60-1000 mPa.s.

7. The inkjet printing type coating liquid according to claim 1, characterized in that: The active monomer is at least one of isobornyl methacrylate, isobornyl acrylate, pentaerythritol tetraacrylate, ethoxy acrylate, 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, ethoxylated trimethylolpropane triacrylate, hydroxyethyl acrylate, 2-ethylacryloyloxymethyl phosphate, and hydroxyethyl acrylate phosphate.

8. The inkjet printing type coating liquid according to claim 1, characterized in that: The initiator is at least one of TMO, 1173, 184, TPO, ITX, 819, 907; and / or, The pigment is at least one of blue pigment phthalocyanine blue, titanium dioxide, phthalocyanine green, iron oxide red, carmine, toluidine red, and carbon black; and / or, The auxiliary agent is one of a defoamer, a silane coupling agent and a leveling agent.

9. The method for preparing a jet printing type coating liquid according to claim 1, characterized in that: The preparation method of the inkjet printing type coating liquid comprises: The phenolic epoxy acrylic resin, polyester acrylate and active monomer are mixed, and then an initiator, a pigment and an auxiliary agent are added to the mixed mixture to obtain the inkjet coating liquid.

10. The use of the inkjet printing type coating liquid according to claim 1, characterized in that: The inkjet printing type coating liquid is applied to an inkjet printing system, and the steps of applying the inkjet printing type coating liquid include: Receiving control electrical signals; In response to the control electrical signal, the printing type coating liquid layer placed in the material storage box is sprayed onto the surface of the processing component to print the processing component.