High-flash-point low-voc silver powder enamel and preparation method thereof

Abstract

This invention discloses a silver powder enamel and its preparation method, providing a silver powder enamel with convenient application, strong adhesion, good water resistance, excellent storage stability, and a bright film, characterized by a high flash point and low VOC content. It comprises the following components, expressed in weight ratios: 55-65 parts silver powder enamel resin, 8-15 parts floating aluminum powder, 0.1-1 part dispersant, 0.1-0.5 parts dispersant, 0.1-0.5 parts orienting agent, 3-15 parts solvent, 0.5-1 part emulsifier A, 0.1-0.5 parts emulsifier B, 0.01-0.05 parts ethylene glycol, and 15-30 parts deionized water, totaling 100 parts by weight. It has a viscosity of 15±5s (Ford cup 4, 23℃), a solids content of 55±5%, a flash point ≥62℃, and VOC ≤350g / L.

Description

Technical Field

[0001] This invention relates to a silver powder enamel and its preparation method, particularly a silver powder enamel with high flash point and low VOC content. Background Technology

[0002] Most solvent-based silver powder paints on the market are made of polyester, alkyd, and acrylic, which are typically low flash point and high VOC. Common solvent-based silver powder paints usually have a flash point below 60℃ and a VOC greater than 420g / L, failing to meet basic environmental and safety requirements. While technological innovations have reduced VOC in high-solids silver powder paints, the high flash point performance is not mentioned. Using high-flash-point solvents in aluminum powder (the powder is called aluminum powder, the paint is generally called silver powder paint) would prolong the drying time, leading to a blooming phenomenon. Water-based silver powder paints also achieve low VOC, but their storage stability is poor after water-based formulation, exhibiting swelling and separation. Continued use will affect aesthetics and prevent the desired anti-corrosion effect. Summary of the Invention

[0003] To address the shortcomings of the aforementioned technologies, this invention provides a silver powder enamel paint that is easy to apply, has strong adhesion, good water resistance, excellent storage stability, and produces a bright film with a high flash point and low VOC content.

[0004] A high flash point, low VOC content silver powder enamel, comprising the following components, each in the following weight ratio: 55-65 parts of silver powder enamel-specific resin.

[0005]

[0006]

[0007] The sum of the weight parts of the above components is 100 parts; the special resin for silver powder paint is prepared from the following components by weight:

[0008] 60-70 parts of petroleum resin intermediate

[0009] 10-20 parts tung oil

[0010] 5-10 parts soybean oil

[0011] 5-10 parts linseed oil

[0012] 10-20 parts of solvent

[0013] The sum of the weight parts of the above components is 100 parts;

[0014] The petroleum resin intermediate described above is prepared from the following components in parts by weight:

[0015]

[0016] The sum of the weight parts of the above components is 100 parts.

[0017] Preferably, the dispersing agent is a low-molecular-weight agent with one metal-loving end and one lipophilic end, such as 4-META (4-methacryloyloxyethyl trimellitic anhydride) or MDP.

[0018] Preferably, the orientation agent is Raybo 41.

[0019] Preferably, the dispersant is KH-560.

[0020] Preferably, emulsifier A is octylphenol polyoxyethylene ether, and emulsifier B is TRITON X-35.

[0021] Preferably, the floating aluminum powder, such as flake floating aluminum powder and spherical floating aluminum powder, is used in combination at a ratio of 0.9:1.1 to 1.3. Preferably, the solvent is a high-boiling-point and high-flash-point solvent, one of SA-1000, SA-1500, SA-1800, and SA-2000.

[0022] A method for preparing a high flash point, low VOC content silver powder enamel involves first preparing a petroleum resin intermediate. The preparation of the petroleum resin intermediate is as follows: 5-15 parts rosin, 38-46 parts light-colored petroleum resin, 10-20 parts maleic anhydride, 1-2 parts xylene (reflux solvent), and 0.01-0.02 parts catalyst are added to a reaction vessel. The mixture is heated to 150±5℃ over 1.5 hours and held at that temperature for 1 hour. Then, the temperature is increased to 180-190℃ over 1 hour and held under reflux for 3 hours. After evacuation, the mixture is cooled to below 50℃ and 2-5 parts glycidyl methacrylate, 20-25 parts solvent, and 0.00... 1-0.005 parts of polymerization inhibitor were added, heated to 120±5℃, stirred, and reacted for 3 hours. The mixture was then cooled and set aside. The total weight of all components used in the preparation of the petroleum resin intermediate was 100 parts. The second step involved the preparation of a special resin for silver powder paint: a monomer mixture consisting of 60-70 parts of petroleum resin intermediate, 10-20 parts of tung oil, 5-10 parts of soybean oil, and 5-10 parts of linoleic acid, along with 10-20 parts of solvent, was added to a reactor and heated to 120±5℃. After reacting for 4 hours, a solid portion of the special resin for silver powder paint was obtained. The total weight of all components was 100 parts. Finally, a high flash point and low VOC content resin was prepared. Silver powder enamel: 1. Prepare diluted emulsifier A by stirring 4.5-9 parts deionized water and 0.5-1 parts emulsifier A at 100-200 rpm for 10 min. 2. Prepare diluted emulsifier B by stirring 2-10 parts solvent and 0.1-0.5 parts emulsifier B at 100-200 rpm for 10 min. 3. Prepare diluted dispersant by stirring 0.1-0.5 parts dispersant and 1-5 parts deionized water for 40 min, then adding 0.01-0.05 parts ethylene glycol and stirring for 10 min. 4. Prepare diluted dispersant by mixing 3-5 parts solvent, 1-6 parts diluted dispersant, and 8-1 parts... Five parts of floating aluminum powder were stirred evenly at a speed of 100-200 r / min for 10 min, and then injected into 55-65 parts of high flash point silver powder paint special resin, 0.1-0.5 parts of orientation agent, and 0.1-1 parts of dispersant. The mixture was stirred at a speed of 500-800 r. / min for 30 min, and then diluted emulsifiers A and B were added dropwise while maintaining the speed. After the addition was completed in 15 min, the stirring speed was increased to 1500-1800 r. / min, and the remaining deionized water was added dropwise over 30 min. After the addition was completed, the mixture was stirred for another 1 h. The total weight of the above components was 100 parts, and the preparation was completed.

[0023] After testing, the prepared high flash point and low VOC content silver powder enamel has a viscosity of 15±5s (Ford cup 4, 23℃), a solid content of 55±5%, a flash point ≥62℃, and a VOC ≤350g / L.

[0024] Preferably, the light-colored petroleum resin is C9 petroleum resin;

[0025] Preferably, the catalyst is zinc oxide;

[0026] Preferably, the polymerization inhibitor is hydroquinone.

[0027] The core part of this invention is:

[0028] 1. A two-step method was used to modify petroleum resin to synthesize a special resin for high flash point silver powder. First, functional monomers were used to graft copolymerize and modify the petroleum resin. Second, refined oil was used for blending and modification. Maleic anhydride and rosin modified the petroleum resin, which increased the branched structure of the petroleum resin, which is conducive to the formation of a three-dimensional network structure and improved adhesion. In addition, maleic anhydride can improve the compatibility of petroleum resin with refined oil, improve the brittleness of the resin, and increase the softening point of the resin. Rosin can further improve the drying properties of the resin. Glycidyl methacrylate modified the petroleum resin to increase the adhesion to the substrate. Then, it was blended with thermoplastic resins of soybean oil, linseed oil and tung oil with smaller molecular weight to obtain a near-interpenetrating network structure, which is conducive to the formation of an emulsion system. At the same time, the advantages of the three refined oils were introduced, resulting in a paint film with strong adhesion, water and alkali resistance and no wrinkling.

[0029] 2. The introduction of the dispersant 4-methacryloyloxyethyl trimellitic anhydride during paint production can stabilize the emulsion system and the silver powder in a dynamic equilibrium state, ensuring that the silver powder will not enter the aqueous phase in the emulsion system and react, thus effectively avoiding the swelling phenomenon.

[0030] 3. During paint preparation, silane coupling agent KH560 is introduced to pretreat the aluminum powder. The Si-OH bonds formed by the hydrolysis of KH560 can form stable covalent bonds with the surface of the aluminum powder. The addition of a small amount of ethylene glycol can effectively control the self-polymerization of Si-OH bonds, allowing the silane coupling agent to be grafted onto the surface of the aluminum powder to form silane-modified aluminum powder. This improves the compatibility of aluminum powder with resin and its storage stability.

[0031] 4. The orientation agent Raybo 41 introduced during paint production can improve storage stability and make aluminum powder "self-organizing" during the coating drying process, which can quickly and neatly arrange itself in the coating, effectively avoiding the phenomenon of mottled or dark paint film.

[0032] 5. Introducing two emulsifiers, octylphenol polyoxyethylene ether TRITON X-35 and octyl polyoxyethylene ether, during paint preparation, allows for a reduction in solvent usage and an increase in deionized water usage, thereby lowering VOCs. TRITON X-35 is first mixed with the solvent at a 1:20 ratio and then added dropwise to the resin at a uniform rate to complete the initial emulsification, increasing the compatibility between the resin and solvent. A suitable viscosity can be obtained with a small amount of solvent. Octyl polyoxyethylene ether is first mixed with deionized water at a 1:9 ratio for secondary emulsification of the resin, which can increase the amount of deionized water used.

[0033] 6. When adding floating aluminum powder to the paint, select flake-shaped floating aluminum powder and spherical floating aluminum powder. The ratio of flake diameter to thickness should be approximately 60:1. Use a mixture of spherical particles with a diameter of 0.1-1µm and flake particles with a diameter of 8-15µm. Even after the flake aluminum powder is oriented, there are still tiny gaps. The spherical aluminum powder can block the micropores of the resin.

[0034] Beneficial effects of the technical solution of this invention

[0035] 1. This invention uses maleic anhydride, glycidyl methacrylate and rosin to modify petroleum resin, which can increase the branched structure of petroleum resin and facilitate its formation of a three-dimensional network structure; the introduction of rosin increases the gloss of petroleum resin; at the same time, the introduction of polar groups has a certain assisting effect on the emulsification of added emulsifiers, which can increase the amount of water used, reduce the amount of solvent used, and reduce VOCs.

[0036] 2. This invention introduces the additive 4-methacryloyloxyethyl trimellitic anhydride, which has both hydrophilic and lipophilic properties. In the slurry state, it plays a role in stabilizing the emulsion system, with one end connected to water or aluminum powder and the other end connected to resin. This also helps to improve the compatibility between aluminum powder and resin and can prevent aluminum powder from settling. In the paint film state, the hydrophilic end is connected to a completely metallic material and the hydrophobic end is connected to resin, which can increase its ability to prevent powdering.

[0037] 3. This invention uses a mixture of flake and spherical aluminum powder in a ratio of 5.5:4.5. The larger the aspect ratio of the flake aluminum powder, the larger the surface area and the better the flocculation. A ratio of flake diameter to thickness of approximately 60:1 is selected, with a mixture of spherical particles with a diameter of 0.1-1µm and flake particles with a diameter of 8-15µm. Even after the flake aluminum powder is oriented, invisible gaps remain. The spherical aluminum powder can block the micropores of the resin. Furthermore, the aluminum powder particles blocked by these gaps are connected together by the spherical aluminum powder, resulting in better thermal conductivity and timely heat transfer. It also provides airtightness and isolates external air, moisture, and ultraviolet radiation from entering the substrate, achieving better rust prevention.

[0038] 4. This invention uses silane coupling agent KH560 to pretreat the surface of aluminum powder by grafting, which improves the compatibility between aluminum powder and resin, enhances the repulsion between the aluminum powder surface and water in the emulsion system, and also improves storage stability.

[0039] 5. The present invention selects Raybo41, a floating orientation agent that can be used in both solvent-based and water-based applications, which can stabilize aluminum powder in the emulsion system; after the coating film is made, the surface does not show mottling or powdering, has a bright gloss, and the effect of light irradiation from multiple directions is consistent and good.

[0040] 6. The TRITONT X-35 and octyl polyoxyethylene ether composite emulsifier selected in this invention can improve the compatibility between the copolymer resin and the solvent, reduce the amount of solvent used, and make the molecular chains reach the same extended state, quickly entering the first step of emulsification. Octyl polyoxyethylene ether is mixed with deionized water and added to enter the second step of emulsification, so that its molecular chains extend and extend into the aqueous phase. The combination of the two reduces the amount of solvent used while increasing the amount of deionized water used, so that the VOC is far below the standard.

[0041] 7. The adhesion test of the prepared paint film is ≤2; the flexibility is ≤2 mm; and the hardness (double pendulum) is ≥0.3.

[0042] The above components were stirred, mixed, and ground to obtain a silver powder enamel with a viscosity of 15±5s (Ford-4 cup, 23℃), a solid content of 55±5%, a flash point ≥62℃, and a VOC ≤350g / L. Detailed Implementation

[0043] To further illustrate the technical means and effects of the present invention in achieving the intended purpose, the following detailed description of the specific implementation methods, structures, features and effects of the present invention, in conjunction with preferred embodiments, is provided below.

[0044] Example 1:

[0045] This invention discloses a silver powder enamel with a high flash point and low VOC content.

[0046] Step 1: Preparation of petroleum resin intermediate: First, add 10 parts rosin, 45 parts light-colored petroleum resin, 15 parts maleic anhydride, 2 parts xylene (reflux solvent), and 0.01 parts catalyst to the reactor. Heat to 150℃ for 1.5 hours and keep reacting for 1 hour. Then, heat to 180℃ for 1 hour and keep reacting under reflux for 3 hours. After vacuuming, cool to below 50℃ and add 5 parts glycidyl methacrylate, 25 parts solvent, and 0.001 parts polymerization inhibitor. Heat to 120℃ and keep reacting with stirring for 3 hours. Then, cool and set aside for later use.

[0047] Step Two:

[0048] Preparation of high flash point silver powder paint special resin: Prepare a monomer mixture consisting of 65 parts modified petroleum intermediate, 15 parts tung oil, 5 parts soybean oil, 5 parts linseed oil, etc., and 10 parts solvent. Add the mixture to a reaction vessel, heat it to 120℃, and keep it at the temperature for 4 hours to obtain the high flash point silver powder paint special resin.

[0049] Step 3:

[0050] To prepare silver powder enamel, by weight:

[0051]

[0052] Preparation process: 1. Dilute emulsifier A is prepared by stirring 4.5 parts of deionized water and 0.5 parts of emulsifier A (octyl polyoxyethylene ether) at 100 r. / min for 10 min; 2. Dilute emulsifier A is prepared by stirring 2 parts of solvent and 0.1 parts of emulsifier B (TRITONT) at 100 r. / min for 10 min. X-35) was stirred at 100 r / min for 10 min to obtain diluted emulsifier B; 3. 0.25 parts of dispersant and 2.5 parts of deionized water were stirred at 100 r / min for 40 min, and then 0.025 parts of ethylene glycol were added and stirred for 10 min to obtain diluted dispersant; 4. 2.975 parts of solvent, 2.775 parts of diluted dispersant and 11 parts of floating aluminum powder were stirred evenly at 100 r / min for 10 min, and then slowly injected into 60 parts of high flash point silver powder paint special resin, 0.25 parts of orientation agent and 0.4 parts of dispersant. After stirring at 500 r / min for 30 min, the speed was kept constant and diluted emulsifier A and B were slowly added dropwise. After the dropwise addition was completed in 15 min, the stirring speed was increased to 1500 r / min, and the remaining deionized water was added dropwise in 30 min. After the dropwise addition was completed, the mixture was stirred for another 1 h to obtain high flash point low VOC silver powder enamel paint.

[0053] Example 2:

[0054] This invention discloses a silver powder magnetic paint with high flash point and low VOC content.

[0055] Step 1: Preparation of petroleum resin intermediate: First, add 12 parts rosin, 46 parts light-colored petroleum resin, 15 parts maleic anhydride, 2 parts xylene (reflux solvent), and 0.01 parts catalyst to the reactor. Heat to 155℃ for 1.5 hours and keep reacting for 1 hour. Then, heat to 190℃ for 1 hour and keep reacting under reflux for 3 hours. After vacuuming, cool to below 50℃ and add 2 parts glycidyl methacrylate, 25 parts solvent, and 0.001 parts polymerization inhibitor. Heat to 125℃ and keep reacting with stirring for 3 hours. Then, cool and set aside for later use.

[0056] Step Two:

[0057] Preparation of high flash point silver powder paint special resin: Prepare a monomer mixture consisting of 65 parts modified petroleum intermediate, 15 parts tung oil, 5 parts soybean oil, 5 parts linseed oil, etc., and 10 parts solvent. Add the mixture to a reaction vessel, heat it to 125℃, and keep it at the temperature for 4 hours to obtain the high flash point silver powder paint special resin.

[0058] Step 3:

[0059] To prepare silver powder enamel, by weight:

[0060]

[0061]

[0062] Preparation process: 1. Dilute emulsifier A is prepared by stirring 4.5 parts of deionized water and 0.5 parts of emulsifier A (octyl polyoxyethylene ether) at 200 r. / min for 10 min; 2. Dilute emulsifier A is prepared by stirring 2 parts of solvent and 0.1 parts of emulsifier B (TRITONT) for 10 min. X-35) was stirred at 200 r / min for 10 min to obtain diluted emulsifier B; 3. 0.25 parts of dispersant and 2.5 parts of deionized water were stirred at 200 r / min for 40 min, and then 0.025 parts of ethylene glycol were added and stirred for 10 min to obtain diluted dispersant; 4. 2.975 parts of solvent, 2.775 parts of diluted dispersant and 11 parts of floating aluminum powder were stirred evenly at 200 r / min for 10 min, and then slowly injected into 60 parts of high flash point silver powder paint special resin, 0.25 parts of orientation agent and 0.4 parts of dispersant. After stirring at 800 r / min for 30 min, the speed was kept constant and diluted emulsifier A and B were slowly added dropwise. After the dropwise addition was completed in 15 min, the stirring speed was increased to 1800 r / min, and the remaining deionized water was added dropwise in 30 min. After the dropwise addition was completed, the mixture was stirred for another 1 h to obtain high flash point low VOC silver powder enamel paint.

[0063] Example 3:

[0064] This invention discloses a silver powder magnetic paint with high flash point and low VOC content.

[0065] Step 1: Preparation of petroleum resin intermediate: First, add 10 parts rosin, 45 parts light-colored petroleum resin, 15 parts maleic anhydride, 2 parts xylene (reflux solvent), and 0.01 parts catalyst to the reactor. Heat to 152℃ for 1.5 hours and keep reacting for 1 hour. Then, heat to 180-190℃ for 1 hour and keep reacting under reflux for 3 hours. After vacuuming, cool to below 50℃ and add 5 parts glycidyl methacrylate, 25 parts solvent, and 0.001 parts polymerization inhibitor. Heat to 123℃ and keep reacting with stirring for 3 hours. Then, cool and set aside for later use.

[0066] Step Two:

[0067] Preparation of high flash point silver powder paint special resin: Prepare a monomer mixture consisting of 65 parts modified petroleum intermediate, 15 parts tung oil, 5 parts soybean oil, 5 parts linseed oil, etc., and 10 parts solvent. Add the mixture to a reaction vessel and heat it to 123℃. After keeping the temperature for 4 hours, the high flash point silver powder paint special resin is obtained.

[0068] Step 3:

[0069] To prepare silver powder enamel, by weight:

[0070]

[0071] Preparation process: 1. Dilute emulsifier A is prepared by stirring 4.5 parts of deionized water and 0.5 parts of emulsifier A (octyl polyoxyethylene ether) at 160 r / min for 10 min; 2. Dilute emulsifier A is prepared by stirring 2 parts of solvent and 0.1 parts of emulsifier B (TRITONT) at 160 r / min for 10 min. X-35) was stirred at 160 r / min for 10 min to obtain diluted emulsifier B; 3. 0.25 parts of dispersant and 2.5 parts of deionized water were stirred at 160 r / min for 40 min, and then 0.025 parts of ethylene glycol were added and stirred for 10 min to obtain diluted dispersant; 4. 2.975 parts of solvent, 2.775 parts of diluted dispersant and 8 parts of floating aluminum powder were stirred evenly at 170 r / min for 10 min, and then slowly injected into 63 parts of high flash point silver powder paint special resin, 0.25 parts of orientation agent and 0.4 parts of dispersant. After stirring at 600 r / min for 30 min, the speed was kept constant and diluted emulsifier A and B were slowly added dropwise. After the dropwise addition was completed in 15 min, the stirring speed was increased to 1700 r / min, and the remaining deionized water was added dropwise in 30 min. After the dropwise addition was completed, the mixture was stirred for another 1 h to obtain high flash point low VOC silver powder enamel paint.

[0072] Example 4:

[0073] This invention discloses a silver powder magnetic paint with high flash point and low VOC content.

[0074] Step 1: Preparation of petroleum resin intermediate: First, add 10 parts rosin, 45 parts light-colored petroleum resin, 15 parts maleic anhydride, 2 parts xylene (reflux solvent), and 0.01 parts catalyst to the reactor. Heat to 151℃ for 1.5 hours and keep reacting for 1 hour. Then, heat to 183℃ for 1 hour and keep reacting under reflux for 3 hours. After vacuuming, cool to below 50℃ and add 5 parts glycidyl methacrylate, 25 parts solvent, and 0.001 parts polymerization inhibitor. Heat to 122℃ and keep reacting with stirring for 3 hours. Then, cool and set aside for later use.

[0075] Step Two:

[0076] Preparation of special resin for silver powder paint: Prepare a monomer mixture consisting of 65 parts modified petroleum intermediate, 15 parts tung oil, 5 parts soybean oil, 5 parts linseed oil, etc., and 10 parts solvent. Add the mixture to a reaction vessel and heat it to 124℃. After keeping the temperature for 4 hours, the special resin for silver powder paint is obtained.

[0077] Step 3:

[0078] High flash point, low VOC content silver powder enamel, by weight:

[0079]

[0080]

[0081] Preparation process: 1. Dilute emulsifier A is prepared by stirring 4.5 parts of deionized water and 0.5 parts of emulsifier A (octyl polyoxyethylene ether) at 145 r / min for 10 min; 2. Dilute emulsifier A is prepared by stirring 2 parts of solvent and 0.1 parts of emulsifier B (TRITONT) at 145 r / min for 10 min. X-35) was stirred at 160 r / min for 10 min to obtain diluted emulsifier B; 3. 0.25 parts of dispersant and 2.5 parts of deionized water were stirred at 160 r / min for 40 min, and then 0.025 parts of ethylene glycol were added and stirred for 10 min to obtain diluted dispersant; 4. 2.975 parts of solvent, 2.775 parts of diluted dispersant and 15 parts of floating aluminum powder were stirred evenly at 126 r / min for 10 min, and then slowly injected into 56 parts of high flash point silver powder paint special resin, 0.25 parts of orientation agent and 0.4 parts of dispersant. After stirring at 660 r / min for 30 min, the speed was kept constant and diluted emulsifier A and B were slowly added dropwise. After the addition was completed in 15 min, the stirring speed was increased to 1590 r / min, and the remaining deionized water was added dropwise in 30 min. After the addition was completed, the mixture was stirred for another 1 h to complete the preparation.

[0082] Example 5:

[0083] This invention discloses a silver powder magnetic paint with high flash point and low VOC content.

[0084] Step 1: Preparation of petroleum resin intermediate: First, add 12 parts rosin, 46 parts light-colored petroleum resin, 15 parts maleic anhydride, 2 parts xylene (reflux solvent), and 0.01 parts catalyst to the reactor. Heat to 155℃ for 1.5 hours and keep reacting for 1 hour. Then, heat to 184℃ for 1 hour and keep reacting under reflux for 3 hours. After vacuuming, cool to below 50℃ and add 2 parts glycidyl methacrylate, 25 parts solvent, and 0.001 parts polymerization inhibitor. Heat to 123℃ and keep reacting with stirring for 3 hours. Then, cool and set aside for later use.

[0085] Step Two:

[0086] Preparation of special resin for silver powder paint: Prepare a monomer mixture consisting of 65 parts modified petroleum intermediate, 15 parts tung oil, 5 parts soybean oil, 5 parts linseed oil, etc., and 10 parts solvent. Add the mixture to a reaction vessel and heat it to 123°C. After holding the temperature for 4 hours, the special resin for silver powder paint is obtained.

[0087] Step 3:

[0088] High flash point, low VOC content silver powder enamel, by weight:

[0089]

[0090]

[0091] Preparation process: 1. Dilute emulsifier A is prepared by stirring 4.5 parts of deionized water and 0.5 parts of emulsifier A (octyl polyoxyethylene ether) at 136 r / min for 10 min; 2. Dilute emulsifier A is prepared by stirring 2 parts of solvent and 0.1 parts of emulsifier B (TRITONT) at 136 r / min for 10 min. X-35) was stirred at 170 r / min for 10 min to obtain diluted emulsifier B; 3. 0.25 parts of dispersant and 2.5 parts of deionized water were stirred at 170 r / min for 40 min, and then 0.025 parts of ethylene glycol were added and stirred for 10 min to obtain diluted dispersant; 4. 2.975 parts of solvent, 2.775 parts of diluted dispersant and 15 parts of floating aluminum powder were stirred evenly at 155 r / min for 10 min, and then slowly injected into 56 parts of high flash point silver powder paint special resin, 0.25 parts of orientation agent and 0.4 parts of dispersant. After stirring at 570 r / min for 30 min, the speed was kept constant and diluted emulsifier A and B were slowly added dropwise. After the dropwise addition was completed in 15 min, the stirring speed was increased to 1660 r / min, and the remaining deionized water was added dropwise in 30 min. After the dropwise addition was completed, the mixture was stirred for another 1 h to obtain high flash point low VOC silver powder enamel paint.

[0092] Based on the above implementation and the testing of the obtained samples, the test results are as follows:

[0093]

[0094]

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simplification, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A high flash point, low VOC silver powder enamel, characterized in that: It comprises the following components, each in the following weight proportions: 55-65 parts of special resin for silver powder paint. 8-15 parts of floating aluminum powder Dispersing agent 0.1-1 part Dispersant 0.1-0.5 parts Orientation agent 0.1-0.5 parts 3-15 parts of solvent Emulsifier A 0.5-1 part Emulsifier B 0.1-0.5 parts Ethylene glycol 0.01-0.05 parts 15-30 parts deionized water The sum of the weight parts of the above components is 100 parts; the special resin for silver powder paint is prepared from the following components by weight: 60-70 parts of petroleum resin intermediate 10-20 parts tung oil 5-10 parts soybean oil 5-10 parts flaxseed oil 10-20 parts of solvent The sum of the weight parts of the above components is 100 parts; The petroleum resin intermediate described above is prepared from the following components in parts by weight: 2-5 parts glycidyl methacrylate 10-20 parts maleic anhydride 5-15 parts rosin 38-46 parts of light-colored petroleum resin Catalyst 0.01-0.02 parts Polymerization inhibitor 0.001-0.005 parts 1-2 parts of reflux solvent 20-25 parts of solvent The sum of the weight parts of the above components is 100 parts.

2. The high flash point, low VOC silver powder enamel according to claim 1, characterized in that: The dispersing agent is a low-molecular-weight agent with one metal-loving end and one lipophilic end, and the low-molecular-weight agent is 4-methacryloyloxyethyl trimellitic anhydride.

3. A high flash point, low VOC silver powder enamel paint according to claim 1 or 2, characterized in that: The aluminum powder is a combination of flake-shaped floating aluminum powder and spherical floating aluminum powder, used in a ratio of 0.9:1.1~1.

3.

4. The high flash point, low VOC silver powder enamel paint according to claim 3, characterized in that: The floating aluminum powder added to the paint is selected from flake-shaped floating aluminum powder and spherical floating aluminum powder. The ratio of flake diameter to thickness is selected to be 40:1-100:

1. The spherical particle size is 0.1-1μm and the flake particle size is 8-15μm.

5. A high flash point, low VOC silver powder enamel paint according to claim 1 or 2, characterized in that: The light-colored petroleum resin is C9 petroleum resin; the orientation agent is Raybo 41; the dispersant is KH-560; the emulsifier A is octylphenol polyoxyethylene ether, and the emulsifier B is TRITON X-35.

6. The high flash point, low VOC silver powder enamel paint according to claim 3, characterized in that: The light-colored petroleum resin is C9 petroleum resin; the orientation agent is Raybo 41; the dispersant is KH-560; the emulsifier A is octylphenol polyoxyethylene ether, and the emulsifier B is TRITON X-35.

7. A high flash point, low VOC silver powder enamel paint according to claim 1 or 2, characterized in that: The catalyst is zinc oxide; the polymerization inhibitor is hydroquinone.

8. The high flash point, low VOC silver powder enamel paint according to claim 3, characterized in that: The catalyst is zinc oxide; the polymerization inhibitor is hydroquinone.

9. The high flash point, low VOC silver powder enamel paint according to claim 4, characterized in that: The catalyst is zinc oxide; the polymerization inhibitor is hydroquinone.

10. A method for preparing a silver powder enamel with a high flash point and low VOC content, characterized in that: First, a petroleum resin intermediate is prepared for later use. The preparation of the petroleum resin intermediate is as follows: 5-15 parts rosin, 38-46 parts light-colored petroleum resin, 10-20 parts maleic anhydride, 1-2 parts xylene (reflux solvent), and 0.01-0.02 parts catalyst are added to a reaction vessel. The mixture is heated to 150±5℃ over 1.5 hours and held at that temperature for 1 hour. Then, the temperature is increased to 180-190℃ over 1 hour and held at that temperature under reflux for 3 hours. After that, a vacuum is applied, and the temperature is lowered to 50℃. Add 2-5 parts glycidyl methacrylate, 20-25 parts solvent, and 0.001-0.005 parts polymerization inhibitor. Heat to 120±5℃ and stir for 3 hours. Then cool and set aside. The total weight of all components used in the preparation of the petroleum resin intermediate is 100 parts. The second step is the preparation of the special resin for silver paint: composed of 60-70 parts petroleum resin intermediate, 10-20 parts tung oil, 5-10 parts soybean oil, and 5-10 parts linseed oil. The monomer mixture and 10-20 parts of solvent were added to a reaction vessel and heated to 120±5℃. After reacting at this temperature for 4 hours, a solid portion of silver powder paint-specific resin was obtained. The total weight of the above components was 100 parts. Finally, a high flash point and low VOC content silver powder enamel was prepared:

1. 4.5-9 parts of deionized water and 0.5-1 parts of emulsifier A were stirred at 100~200 r / min for 10 min to obtain diluted emulsifier A; 2. 2-1 1. Prepare diluted emulsifier B by stirring 0 parts solvent and 0.1-0.5 parts emulsifier B at 100-200 r / min for 10 min.

2. Prepare diluted dispersant by stirring 0.1-0.5 parts dispersant and 1-5 parts deionized water at 100-200 r / min for 40 min, then adding 0.01-0.05 parts ethylene glycol and stirring for another 10 min.

3. Prepare diluted dispersant by stirring 3-5 parts solvent, 1-6 parts diluted dispersant, and 8-15 parts floating aluminum powder at 100-200 r / min. After stirring at 200 rpm for 10 minutes, the mixture is injected into 55-65 parts of high flash point silver powder paint resin, 0.1-0.5 parts of orientation agent, and 0.1-1 parts of dispersant. The mixture is stirred at 500-800 rpm for 30 minutes, and then diluted emulsifiers A and B are added dropwise while maintaining the stirring speed. After the addition is completed in 15 minutes, the stirring speed is increased to 1500-1800 rpm. The remaining deionized water is added dropwise over 30 minutes. After the addition is completed, the mixture is stirred for another 1 hour. The total weight of the above components is 100 parts, and the preparation is complete.

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