A high flash point alkyd coating with VOC content below 420 g / L and its preparation method

Abstract

This invention relates to a high flash point alkyd coating with a VOC content below 420 g / L and its preparation method, belonging to the field of coatings. The high flash point alkyd coating comprises: high flash point alkyd resin, 65% petroleum resin liquid, dicyclopentadienyloxyethyl methacrylate, various environmentally friendly pigments, ultrafine barium sulfate, organic bentonite, dispersant, defoamer, cobalt isooctanoate drier, low-naphthalene S-150 aromatic solvent, D60 environmentally friendly solvent, and anti-skinning agent. Under suitable application viscosity (either the coating itself or after adding diluent), the actual VOC content of the high flash point alkyd coating prepared by this invention is still less than 420 g / L, whether applied with the coating itself or after adding diluent. It exhibits good surface finish, drying properties, recoatability, and overall film performance that meets the requirements of the national recommended standard GB / T 25251-2010 for alkyd resin coatings.

Description

Technical Field

[0001] This invention belongs to the field of coatings, specifically relating to a high flash point alkyd coating with VOC content below 420 g / L and its preparation method. Background Technology

[0002] Traditional alkyd coatings have relatively low flash points and are classified as hazardous chemicals. With the increasing national requirements for the management of hazardous chemicals, the corresponding production, storage, and transportation conditions have become more stringent. At the same time, in order to further promote energy conservation and environmental protection, high flash point and low VOC alkyd coatings have emerged.

[0003] Currently, the existing technical solutions for achieving high flash point, low VOC alkyd coatings are typically as follows:

[0004] 1. High-solids, low-viscosity, high-flash-point alkyd resin is used;

[0005] 2. Increase the solids content of the coating to reduce VOCs;

[0006] 3. Select fillers with low oil absorption and increase the pigment-to-binder ratio in the formulation.

[0007] The above methods can be used individually or in combination, with the effect of resin playing a dominant role, while the others are auxiliary means.

[0008] However, the above-mentioned technical solutions also have corresponding technical drawbacks:

[0009] 1. In the field of high-solids and low-viscosity resins, high-solids and low-viscosity alkyd resins have always been a popular research direction for alkyd coatings. However, compared with traditional alkyd resins, their molecular weight is relatively low. Whether in related literature or in practical applications, there are still some problems, such as single or combined problems such as workability, drying, recoating, and surface effect defects. Therefore, their practical application is relatively limited. If the requirement of high flash point is added, some defects such as drying and recoating will be further amplified after adding high flash point slow-drying solvents.

[0010] 2. Simply increasing the solid content of the coating while ignoring the actual viscosity during application may result in a high viscosity, even with low VOC. In practice, a thinner still needs to be added, causing the actual VOC to exceed the expected value.

[0011] 3. Simply increasing the amount of pigments and fillers in the formula will reduce the glossy surface effect.

[0012] Existing publicly available technologies use high-solids-content, low-viscosity, high-flash-point alkyd resins to increase solids content and achieve VOCs less than or far below 420 g / L, while also meeting the requirements for high flash point. However, some properties such as workability, drying time, recoatability, and hardness are affected to some extent. The recoatability cannot meet the requirements of the national standard GB / T 25251-2010 Alkyd Resin Coatings recommended for conventional alkyd coatings. Summary of the Invention

[0013] The technical problem to be solved by this invention is to provide a high flash point alkyd coating with VOC below 420 g / L and its preparation method. Under the premise of a suitable viscosity for application (the viscosity of the coating itself or after adding a thinner), the actual VOC of the coating itself or after adding a thinner is still less than 420 g / L. It has good surface effect, drying properties, recoatability, and the overall performance of the paint film still meets the national recommended standard GB / T 25251-2010 (alkyd resin coatings). Furthermore, it is convenient to apply, its high flash point makes it easy to transport and store, and it is safe and environmentally friendly.

[0014] To solve the above problems, the present invention is achieved through the following technical solution:

[0015] The first objective of this invention is:

[0016] A high flash point alkyd coating with VOC content below 420 g / L is provided, comprising the following components in parts by weight:

[0017] The composition includes: 39-42 parts high flash point alkyd resin, 5-8 parts 65% petroleum resin liquid, 1-5 parts dicyclopentadienyloxyethyl methacrylate, 1-20 parts various environmentally friendly pigments, 16-36 parts ultrafine barium sulfate, 0.2-0.6 parts organic bentonite, 0.2-1 part dispersant, 0.1-0.2 parts defoamer, 0.12-0.2 parts 10% cobalt isooctanoate drier, 0.5-1 part 12% zirconium isooctanoate drier, 0.5-1 part 4% calcium isooctanoate drier, 3-8 parts low naphthalene S-150 aromatic solvent, 6-12 parts D60 environmentally friendly solvent, and 0.2-0.5 parts anti-skinning agent, for a total mass of 100 parts.

[0018] A further optimization of the high flash point alkyd coating with VOC content below 420 g / L according to the present invention is as follows:

[0019] The high flash point alkyd resin is Changxing Chemical's 1207-70.

[0020] A further optimization of the high flash point alkyd coating with VOC content below 420 g / L according to the present invention is as follows:

[0021] The C9 petroleum resin used is Zilon Chemical's L-130; and / or

[0022] The C5 petroleum resin used is E-1304 from Shanghai Jinsen Petroleum Resin Co., Ltd.

[0023] The 65% petroleum resin solution is a resin solution with a solid content of 65% by mass, which is pre-dissolved in a low-naphthalene S-150 aromatic solvent at a mass ratio of 5:1 for C9 and C5 petroleum resin.

[0024] A further optimization of the high flash point alkyd coating with VOC content below 420 g / L according to the present invention is as follows:

[0025] The dicyclopentadieneoxyethyl methacrylate mentioned above is an active diluent, and is a product of Shandong Ruibolong Chemical Technology Co., Ltd.

[0026] A further optimization of the high flash point alkyd coating with VOC content below 420 g / L according to the present invention is as follows:

[0027] The aforementioned low-naphthalene S-150 aromatic solvent is a product of Jiangsu Hualun Chemical Co., Ltd.

[0028] The D60 environmentally friendly solvent is a product of ExxonMobil.

[0029] A further optimization of the high flash point alkyd coating with VOC content below 420 g / L according to the present invention is as follows:

[0030] The 10% cobalt isooctanoate drying agent is Changfeng Chemical's EC-10; and / or

[0031] The 12% zirconium isooctanoate drying agent is Changfeng Chemical's 827-1; and / or

[0032] The 4% calcium isooctanoate drying agent mentioned is Changfeng Chemical's 824-2D.

[0033] A further optimization of the high flash point alkyd coating with VOC content below 420 g / L according to the present invention is as follows:

[0034] The aforementioned environmentally friendly pigments are those that comply with national mandatory standards, such as titanium dioxide, iron oxide red, iron oxide yellow, organic yellow, carbon black, etc.; and / or

[0035] The ultrafine barium sulfate is 10HB ultrafine barium sulfate in nanoparticle form; and / or

[0036] The organic bentonite mentioned is BYK Chemical's HY bentonite; and / or

[0037] The dispersant is BYK 108 from BYK Chemicals; and / or

[0038] The defoamer is BASF's BYK-051; and / or

[0039] The anti-skinning agent mentioned is methyl ethyl ketone oxime from Shanghai Liming Chemical Co., Ltd.

[0040] A further optimization of the high flash point alkyd coating with VOC content below 420 g / L according to the present invention is as follows:

[0041] The C9 petroleum resin used is Zilon Chemical's L-130;

[0042] The C5 petroleum resin used is E-1304 from Shanghai Jinsen Petroleum Resin Co., Ltd.

[0043] The second objective of this invention is:

[0044] A method for preparing the aforementioned high flash point alkyd coating with VOC content below 420 g / L is provided, comprising the following preparation steps:

[0045] S1. Mix a portion of high flash point alkyd resin, a portion of low naphthalene S-150 aromatic solvent and a portion of D60 environmentally friendly solvent, disperse evenly at high speed, then add organic bentonite, dispersant and defoamer in sequence under medium and low speed stirring, disperse evenly at high speed, then add various environmentally friendly pigments and ultrafine barium sulfate under medium and low speed stirring, mix evenly and then grind in a sand mill to a fineness ≤20 microns.

[0046] S2. Add the remaining high flash point alkyd resin, 65% petroleum resin liquid, dicyclopentadienoxyethyl methacrylate, the remaining low naphthalene S-150 aromatic solvent and the remaining D60 environmentally friendly solvent in sequence, 10% cobalt isooctanoate drying agent, 12% zirconium isooctanoate drying agent, 4% calcium isooctanoate drying agent and anti-skinning agent, and stir at medium to high speed until uniform.

[0047] S3. After the performance test meets the requirements, filter and package.

[0048] The basic idea and formulation concept of the high flash point alkyd coating with VOC below 420 g / L and its preparation method of the present invention are as follows:

[0049] 1. Structure of the main film-forming material:

[0050] The solution used is high flash point alkyd resin + petroleum resin + reactive diluent, rather than high flash point alkyd resin with high solids content and low viscosity.

[0051] The alkyd resin selected in this invention is not a high-solids, low-viscosity resin, but a high-flash-point alkyd resin with moderate viscosity, good drying and recoatability. It has excellent performance and its overall performance meets the requirements of GB / T25251-2010 alkyd resin coatings. It avoids the drawbacks of using high-solids, low-viscosity, high-flash-point alkyd resins, such as slow drying and poor recoatability. Under the premise of high gloss and good workability, the VOC of the series of coatings is about 430-450g / L, exceeding 420g / L.

[0052] The application of petroleum resins in blends with low flash point alkyd resins has been reported, but no such reports have been found with high flash point alkyd resins. In conventional low flash point alkyd coatings, adding petroleum resin within a certain range can reduce viscosity, VOCs, and significantly improve drying properties; however, excessive amounts reduce toughness and mechanical properties. Generally, the addition can even be as high as 25%–35%, with a slight loss of performance, to achieve the effect of reducing VOCs. However, when blending petroleum resins with high flash point alkyd resins, large amounts cannot be added. Although it can significantly improve drying properties and reduce VOCs, it will significantly reduce recoating performance. The presumed reason is that the solvent in the high flash point alkyd system dries slowly. Although the addition of petroleum resin improves physical drying in the early stages, petroleum resin has no cross-linking effect. The more it is added, the lower the overall chemical cross-linking degree becomes. This is also due to the slow evaporation of the high flash point solvent. Therefore, the total amount of petroleum resin added in this invention should not exceed 20% of the total resin amount. There are many types of petroleum resins, generally including C9 petroleum resin, C5 petroleum resin, C9 / C5 copolymer petroleum resin, and C5 hydrogenated petroleum resin. These can be used in some conventional low-flash-point alkyd coatings, depending on the situation. However, in this invention, only C9 petroleum resin can be selected as the main component to ensure drying properties. Some C5 petroleum resins have little effect on improving drying properties, but they do have a certain anti-skinning function, and their application depends on the system. Without compromising viscosity and overall performance, it can increase solids content by 3-5% and reduce VOC by approximately 30-50%, but the overall VOC level does not reach an average of below 420 g / L.

[0053] Regarding the selection of reactive diluents, some literature reports have been published, but these are limited to low-flash-point alkyd coatings. No related patents or literature have been found for high-flash-point alkyd coatings. Conventional low-flash-point alkyd coatings dry relatively quickly, and adding a certain amount has little impact on drying properties. Some literature even mentions that adding 10% of these diluents to conventional low-flash-point alkyd systems only results in a slight loss of drying properties. However, high-flash-point alkyd systems use solvents that dry slowly. These reactive diluents are equivalent to solvents with even higher flash points. While adding them at the same amount as in conventional low-flash-point alkyd coatings can effectively reduce VOCs, it will significantly reduce drying properties.

[0054] The synergistic relationship among the three can be illustrated by a simple experimental result from the inventor.

[0055]

[0056] As can be seen from the table above, although adding petroleum resin alone to high flash point alkyd resin significantly improves drying properties, excessive addition affects recoatability. When the addition amount does not affect recoatability, the reduction in VOC is limited. When only reactive diluent is added, although VOC can be reduced, drying properties are significantly reduced. The synergistic effect of the three can reduce VOC to below 420 g / L while ensuring that the overall performance (drying properties and recoatability) does not decrease significantly.

[0057] 2. Regarding the selection of pigments and fillers: low oil absorption and high gloss pigments and fillers are preferred. Under normal application viscosity, too much pigment and filler will significantly reduce gloss and improve recoatability, while too little will make it difficult to achieve the desired overall solid content, which is not conducive to reducing VOC. The overall principle is to add as much high gloss and low oil absorption filler as possible to reduce VOC and viscosity while ensuring a gloss of greater than 80 degrees. It is not about simply adding more pigments and fillers to achieve the goal of reducing VOC.

[0058] 3. Solvent Selection: While ensuring solubility, choose a low-density solvent to reduce VOCs and balance the application viscosity. Low-naphthalene S-150 aromatic solvent has strong dissolving power, but its specific gravity is relatively high. Adding too much can easily cause bottoming out after 24 hours of recoating. D60 solvent has weak dissolving power and a light specific gravity, but it has a slight VOC-reducing effect, making it less prone to bottoming out after recoating. Under the premise of ensuring dissolving power, adding a proportion of lighter solvent can also effectively reduce VOCs and ensure recoating to a certain extent.

[0059] 4. Combinations of different driers are individually designed for each pigment color to achieve the best performance balance while ensuring drying time and recoatability. Compared with the selected high flash point alkyd coatings, due to their longer open time, the amount of drier can be increased appropriately without affecting the brightness and ensuring recoatability; while increasing the amount of pigments and fillers can reduce the amount of drier. The optimal ratio between the two is determined through experiments to ensure both drying time and recoatability.

[0060] This invention focuses on these four aspects. Through scientific and reasonable formula design, based on high flash point alkyd coatings, and through innovative material combinations and the synergistic effect of multiple technologies, VOC is reduced from approximately 450 g / L to approximately 380 g / L, resulting in a high flash point alkyd coating with VOC below 420 g / L. Because the main resin is a high flash point alkyd resin with suitable viscosity, good drying properties, and good recoatability, it avoids some of the drawbacks of using high-solids, low-viscosity high flash point alkyd resins. Compared with conventional high-performance high flash point alkyd coatings, the overall performance is not significantly reduced and still meets the relevant requirements of GB / T 25251-2010 (Alkyd Resin Coatings). Compared with competing products on the market and publicly disclosed related patent products, it solves the technical problems of poor application performance and easy bottoming after 24-hour recoating. Currently, no known related patents or competing products on the market have achieved the performance of "no abnormalities in 24-hour recoatability".

[0061] This invention provides a high-flash-point alkyd coating with VOC levels below 420 g / L. Compared to traditional low-flash-point, high-VOC alkyd coatings, which suffer from poor workability, slow drying, and tendency to peel when recoated, the product prepared by this invention exhibits superior workability. Its surface finish, drying properties, and recoatability meet the recommended standards for conventional alkyd coatings, GB / T25251-2010 Alkyd Resin Coatings. Furthermore, as a high-flash-point alkyd coating, it is classified as a non-hazardous chemical and can be stored and transported as a general chemical. The overall hazardous substance limits strictly adhere to or exceed the limits specified in GB 30981-2020 Industrial Protective Coatings. Detailed Implementation

[0062] To make the application, technical solution, and advantages of this invention clearer, the invention is described in detail with reference to specific embodiments. It should be understood that the embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this invention. Any simple improvements to the preparation method of this invention based on the inventive concept fall within the scope of protection of this invention.

[0063] Examples 1-4#: A high flash point alkyd coating with VOC content below 420 g / L and its preparation method.

[0064] A high flash point alkyd coating with VOC content below 420 g / L comprises the following components by weight:

[0065] The composition includes: 39-42 parts high flash point alkyd resin, 5-8 parts 65% petroleum resin liquid, 1-5 parts dicyclopentadienyloxyethyl methacrylate, 1-20 parts various environmentally friendly pigments, 16-36 parts ultrafine barium sulfate, 0.2-0.6 parts organic bentonite, 0.2-1 part dispersant, 0.1-0.2 parts defoamer, 0.12-0.2 parts 10% cobalt isooctanoate drier, 0.5-1 part 12% zirconium isooctanoate drier, 0.5-1 part 4% calcium isooctanoate drier, 3-8 parts low naphthalene S-150 aromatic solvent, 6-12 parts D60 environmentally friendly solvent, and 0.2-0.5 parts anti-skinning agent, for a total mass of 100 parts.

[0066] The high flash point alkyd resin is Changxing Chemical's 1207-70.

[0067] The C9 petroleum resin used is Zilon Chemical's L-130.

[0068] The C5 petroleum resin used is E-1304 from Shanghai Jinsen Petroleum Resin Co., Ltd.

[0069] The 65% petroleum resin solution is a resin solution with a solid content of 65% by mass, which is pre-dissolved in a low-naphthalene S-150 aromatic solvent at a mass ratio of 5:1 for C9 and C5 petroleum resin.

[0070] The dicyclopentadieneoxyethyl methacrylate mentioned above is an active diluent, and is a product of Shandong Ruibolong Chemical Technology Co., Ltd.

[0071] The aforementioned low-naphthalene S-150 aromatic solvent is a product of Jiangsu Hualun Chemical Co., Ltd.

[0072] The D60 environmentally friendly solvent is a product of ExxonMobil.

[0073] The 10% cobalt isooctanoate drying agent mentioned is EC-10 from Changfeng Chemical.

[0074] The 12% zirconium isooctanoate drying agent mentioned is Changfeng Chemical's 827-1;

[0075] The 4% calcium isooctanoate drying agent mentioned is Changfeng Chemical's 824-2D; and

[0076] The various environmentally friendly pigments mentioned are pigments that comply with national mandatory standards, such as titanium dioxide, iron oxide red, iron oxide yellow, organic yellow, carbon black, etc.

[0077] The ultrafine barium sulfate mentioned is 10HB ultrafine barium sulfate in nanoparticle form;

[0078] The organic bentonite mentioned is HY bentonite from BYK Chemicals;

[0079] The dispersant mentioned is BYK108 from BYK Chemicals;

[0080] The defoamer mentioned is BASF's BYK-051;

[0081] The anti-skinning agent mentioned is methyl ethyl ketone oxime from Shanghai Liming Chemical Co., Ltd.

[0082] Its preparation method includes the following preparation steps:

[0083] S1. Mix a portion of high flash point alkyd resin, a portion of low naphthalene S-150 aromatic solvent and a portion of D60 environmentally friendly solvent, disperse evenly at high speed, then add organic bentonite, dispersant and defoamer in sequence under medium and low speed stirring, disperse evenly at high speed, then add various environmentally friendly pigments and ultrafine barium sulfate under medium and low speed stirring, mix evenly and then grind in a sand mill to a fineness ≤20 microns.

[0084] S2. Add the remaining high flash point alkyd resin, 65% petroleum resin liquid, dicyclopentadienoxyethyl methacrylate, the remaining low naphthalene S-150 aromatic solvent and the remaining D60 environmentally friendly solvent in sequence, 10% cobalt isooctanoate drying agent, 12% zirconium isooctanoate drying agent, 4% calcium isooctanoate drying agent and anti-skinning agent, and stir at medium to high speed until uniform.

[0085] S3. After the performance test meets the requirements, filter and package.

[0086] The basic idea and formulation concept of the high flash point alkyd coating with VOC below 420 g / L and its preparation method of the present invention are as follows:

[0087] Table 1. Composition of various embodiments of the present invention (parts by weight)

[0088]

[0089] Table 2 Performance Table of Various Embodiments of the Invention

[0090]

[0091]

[0092]

[0093] Based on the performance of the embodiments in the table above, the present invention is a high flash point alkyd coating with VOC below 420 g / L. The flash point is greater than 60°C, and the VOC reaches a predetermined value of less than 420 g / L, approximately 380 ± 10 g / L. The performance standard meets or partially exceeds the recommended standard GB / T 25251-2010 (alkyd resin coatings). The overall limit of hazardous substances strictly complies with the provisions of GB 30981-2020 (limit of hazardous substances in industrial protective coatings), which is superior to the standard. With moderate viscosity, it can be directly brushed, producing a high-gloss surface effect. It exhibits excellent storage stability (no skinning at 50℃ for 30 days), surpassing the standard (no skinning at 50℃ for 48 hours). Its recoatability meets the GB / T 25251-2010 standard (currently, no related patented products or competing products on the market have been found to meet this performance). It solves the problems of difficult direct application, poor drying, and easy undercoating after 24 hours when recoating with known high flash point, low VOC alkyd coating patented products or common competing products on the market.

[0094] In summary, the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any changes, modifications, and evolutions made by those skilled in the art without departing from the scope of the present invention based on the disclosed technical content shall be considered equivalent embodiments of the present invention. Furthermore, any changes, modifications, and evolutions made to the above embodiments based on the essential technology of the present invention shall still fall within the protection scope of the present invention.

[0095] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0096] Experimental methods not specified in this invention are generally performed under conventional conditions or as recommended by the manufacturer.

[0097] Unless otherwise stated, the various optimized technical solutions in this invention can be combined with each other.

[0098] Unless otherwise stated, percentages and parts are weight percentages and weight parts.

[0099] Experimental methods not specified in the instructions and examples are generally performed under standard conditions or as recommended by the manufacturer.

[0100] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as are familiar to those skilled in the art. Furthermore, any methods and materials similar to or equivalent to those described herein may be used in the methods of this invention.

Claims

1. A high flash point alkyd coating with VOC content below 420 g / L, characterized in that: It comprises the following components by mass: The composition includes: 39-42 parts high flash point alkyd resin, 5-8 parts 65% petroleum resin liquid, 1-5 parts dicyclopentadienyloxyethyl methacrylate, 1-20 parts various environmentally friendly pigments, 16-36 parts ultrafine barium sulfate, 0.2-0.6 parts organic bentonite, 0.2-1 part dispersant, 0.1-0.2 parts defoamer, 0.12-0.2 parts 10% cobalt isooctanoate drier, 0.5-1 part 12% zirconium isooctanoate drier, 0.5-1 part 4% calcium isooctanoate drier, 3-8 parts low naphthalene S-150 aromatic solvent, 6-12 parts D60 environmentally friendly solvent, and 0.2-0.5 parts anti-skinning agent, for a total mass of 100 parts.

2. The high flash point alkyd coating with VOC content below 420 g / L according to claim 1, characterized in that: The high flash point alkyd resin is Changxing Chemical's 1207-70.

3. The high flash point alkyd coating with VOC content below 420 g / L according to claim 1, characterized in that: The 65% petroleum resin solution is a resin solution with a solid content of 65% by mass, which is pre-dissolved in a low-naphthalene S-150 aromatic solvent at a mass ratio of 5:1 for C9 and C5 petroleum resin.

4. The high flash point alkyd coating with VOC content below 420 g / L according to claim 1, characterized in that: The dicyclopentadieneoxyethyl methacrylate mentioned above is an active diluent, and is a product of Shandong Ruibolong Chemical Technology Co., Ltd.

5. The high flash point alkyd coating with VOC content below 420 g / L according to claim 1, characterized in that: The aforementioned low-naphthalene S-150 aromatic solvent is a product of Jiangsu Hualun Chemical Co., Ltd. The D60 environmentally friendly solvent is a product of ExxonMobil.

6. The high flash point alkyd coating with VOC content below 420 g / L according to claim 1, characterized in that: The 10% cobalt isooctanoate drying agent is Changfeng Chemical's EC-10; and / or The 12% zirconium isooctanoate drying agent is Changfeng Chemical's 827-1; and / or The 4% calcium isooctanoate drying agent mentioned is 824-2D from Changfeng Chemical.

7. The high flash point alkyd coating with VOC below 420 g / L according to claim 1, characterized in that: The environmentally friendly pigments described herein are pigments that comply with national mandatory standards; The ultrafine barium sulfate is 10HB ultrafine barium sulfate in nanoparticle form; and / or The organic bentonite mentioned is BYK Chemical's HY bentonite; and / or The dispersant is BYK 108 from BYK Chemicals; and / or The defoamer is BASF's BYK-051; and / or The anti-skinning agent mentioned is methyl ethyl ketone oxime from Shanghai Liming Chemical Co., Ltd.

8. The high flash point alkyd coating with VOC below 420 g / L according to claim 3, characterized in that: The C9 petroleum resin used is Zilon Chemical's L-130; and / or The C5 petroleum resin used is E-1304 from Shanghai Jinsen Petroleum Resin Co., Ltd.

9. A method for preparing a high flash point alkyd coating with VOC content below 420 g / L as described in claim 1, characterized in that: It includes the following preparation steps: S1. Mix a portion of high flash point alkyd resin, a portion of low naphthalene S-150 aromatic solvent and a portion of D60 environmentally friendly solvent, disperse evenly at high speed, then add organic bentonite, dispersant and defoamer in sequence under medium and low speed stirring, and disperse evenly at high speed. Then add various environmentally friendly pigments and ultrafine barium sulfate under medium and low speed stirring, mix evenly and then grind in a sand mill to a fineness of ≤20 microns. S2. Add the remaining high flash point alkyd resin, 65% petroleum resin liquid, dicyclopentadienoxyethyl methacrylate, the remaining low naphthalene S-150 aromatic solvent and the remaining D60 environmentally friendly solvent in sequence, 10% cobalt isooctanoate drying agent, 12% zirconium isooctanoate drying agent, 4% calcium isooctanoate drying agent and anti-skinning agent, and stir at medium to high speed until uniform. S3. After the performance test meets the requirements, filter and package.

Images