High-flash-point alkyd paint with VOC (volatile organic compound) lower than 420g / L and preparation method of high-flash-point alkyd paint

Abstract

The invention relates to a high-flash-point alkyd paint with VOC lower than 420g / L and a preparation method thereof, and belongs to the field of paints.The high-flash-point alkyd paint is prepared from high-flash-point alkyd resin, 65% petroleum resin liquid, dicyclopentadiene oxyethyl methacrylate, environment-friendly pigments of various colors, superfine barium sulfate, organobentonite, a dispersing agent, a defoaming agent and a cobalt iso-octoate drier. The solvent is prepared from a low-naphthalene S-150 aromatic solvent, a D60 environment-friendly solvent and an anti-skinning agent. According to the prepared high-flash-point alkyd paint, on the premise of the viscosity suitable for construction (the viscosity of the paint or the viscosity after a diluent is added), the actual VOC of the paint or the construction after the diluent is added is still smaller than 420g / L, consumption tax is avoided, and the high-flash-point alkyd paint has the good surface effect, dryness and recoatability and is suitable for being used for construction. And the overall performance of the paint film can still meet the requirements of the alkyd resin paint in the national recommended standard GB / T 25251-2010.

Description

Technical Field

[0001] The invention belongs to the field of coatings, and in particular relates to a high-flash point alkyd coating with a VOC lower than 420 g / L and a preparation method thereof. Background Art

[0002] Traditional alkyd paints have a relatively low flash point and are classified as hazardous chemicals. With the improvement of the state's 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, the state has approved a policy that, from February 1, 2015, paints with a volatile organic compound (VOC) content of less than 420 g / L (inclusive) under construction will be exempted from consumption tax. Under this dual background, high flash point and low VOC alkyd paints have also emerged.

[0003] The current technical solutions for achieving high flash point and low VOC alkyd coatings are usually:

[0004] 1. Use high-solid, low-viscosity, high-flash point alkyd resin;

[0005] 2. Increase the solid content of the coating and reduce VOC;

[0006] 3. Choose fillers with low oil absorption and increase the pigment-to-base ratio in the formula.

[0007] The above methods are used alone or in combination, among which the influence of resin plays a dominant role and the others are some auxiliary means.

[0008] However, the above technical solutions also have corresponding technical defects:

[0009] 1. In the direction of adopting high-solid and low-viscosity resins, high-solid and low-viscosity alkyd resins have always been a hot research direction for alkyd coatings. However, compared with traditional alkyd resins, their molecular weight is relatively low. Whether in relevant literature or in actual applications, there are still some problems, such as single or complex problems such as construction performance, drying performance, recoating performance, and surface effect defects. Therefore, the actual application is relatively not extensive. If the requirement of high flash point is added, some defects such as drying performance and recoating performance 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 construction viscosity. Although the VOC is low, the viscosity is too high, and diluent still needs to be added during actual construction, causing the actual construction VOC to be greater than the expected value;

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

[0012] The existing disclosed technology uses high-solid-content, low-viscosity, high-flash-point alkyd resin to increase the solid content to achieve VOC less than or far below 420 g / L, while meeting the high flash point requirement. However, some properties such as workability, drying properties, recoatability, hardness, etc. are affected to a certain 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 the present invention is to provide a high flash point alkyd paint with a VOC lower than 420 g / L and a preparation method thereof. Under the premise of a viscosity suitable for construction (the viscosity of the paint itself or after adding a diluent), the actual VOC of the paint itself or after adding a diluent is still less than 420 g / L, avoiding consumption tax, having good surface effect, dryness, and recoatability, and the overall performance of the paint film can still meet the national recommended standard-GB / T 25251-2010 (alkyd resin paint). In addition, it is also convenient to construct, and the high flash point performance facilitates transportation and storage, and is safe and environmentally friendly.

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

[0015] The first invention object of the present invention is:

[0016] Provided is a high flash point alkyd paint having a VOC of less than 420 g / L, comprising the following components in parts by weight:

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

[0018] A further optimization of a high flash point alkyd coating with a VOC lower than 420 g / L of the present invention is as follows:

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

[0020] A further optimization of a high flash point alkyd coating with a VOC lower than 420 g / L of the present invention is as follows:

[0021] The C9 petroleum resin is L-130 produced by Chillon Chemical; and / or

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

[0023] The 65% petroleum resin liquid is C9 petroleum resin: C5 petroleum resin in a mass ratio of 5:1, which is pre-dissolved in a low-naphthalene S-150 aromatic solvent to form a resin liquid with a mass percentage of 65% solid content.

[0024] A further optimization of a high flash point alkyd coating with a VOC lower than 420 g / L of the present invention is as follows:

[0025] The dicyclopentadienyloxyethyl methacrylate is a reactive diluent and is a product of Shandong Ruibolong Chemical Technology Co., Ltd.

[0026] A further optimization of a high flash point alkyd coating with a VOC lower than 420 g / L of the present invention is as follows:

[0027] The 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 a high flash point alkyd coating with a VOC lower than 420 g / L of the present invention is as follows:

[0030] The 10% cobalt isooctanoate drier is EC-10 from Changfeng Chemical; and / or

[0031] The 12% zirconium isooctanoate drier is 827-1 from Changfeng Chemical; and / or

[0032] The 4% calcium isooctanoate drier is 824-2D from Changfeng Chemical.

[0033] A further optimization of a high flash point alkyd coating with a VOC lower than 420 g / L of the present invention is as follows:

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

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

[0036] The organobentonite is HY bentonite from BYK Chemicals; and / or

[0037] The dispersant is BYK108 from BYK Chemicals; and / or

[0038] The defoamer is BYK-051 from BASF Chemicals; and / or

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

[0040] A further optimization of a high flash point alkyd coating with a VOC lower than 420 g / L of the present invention is as follows:

[0041] The C9 petroleum resin is L-130 produced by Chillon Chemical.

[0042] The C5 petroleum resin adopts E-1304 produced by Shanghai Jinsen Petroleum Resin Co., Ltd.

[0043] The second object of the present invention is:

[0044] A method for preparing the high flash point alkyd coating having a VOC lower than 420 g / L as described above is provided, comprising the following preparation steps:

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

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

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

[0048] The basic idea and formulation composition of the high flash point alkyd coating with a VOC lower than 420 g / L and the preparation method thereof of the present invention are as follows:

[0049] 1. Main film-forming material structure:

[0050] High flash point alkyd resin + petroleum resin + reactive active diluent, rather than choosing high flash point alkyd resin with high solid content and low viscosity.

[0051] The alkyd resin selected in the present invention is not a high-solid low-viscosity resin, but a high-flash point alkyd resin with moderate viscosity, good drying and recoating properties, excellent performance, and overall performance meets the requirements of GB / T25251-2010 alkyd resin coatings, avoiding the related disadvantages of using high-solid low-viscosity high-flash point alkyd resins - slow drying and poor recoating properties; under the premise of high gloss and good construction properties, the VOC of the series of coatings is about 430-450g / L, exceeding 420g / L;

[0052] There have been reports on the use of petroleum resin in combination with low-flash alkyd resin, but no relevant reports have been found in high-flash alkyd resin. In conventional low-flash alkyd coatings, adding petroleum resin within a certain range can be used to reduce viscosity and VOC, and significantly improve dryness. Excessive addition will reduce resistance and mechanical properties. Generally, the amount added can even be as large as 25% to 35% to achieve the effect of reducing VOC with a slight loss of performance. However, when petroleum resin is mixed with high-flash alkyd resin, it cannot be added in large quantities. Although it can greatly improve dryness and reduce VOC, it will significantly reduce the recoating performance. It is speculated that the reason is that the solvent in the high-flash alkyd system dries slowly. Although the addition of petroleum resin improves the physical drying in the early stage, the petroleum resin has no cross-linking effect. The more the amount is added, the lower the overall chemical cross-linking degree is. In addition, the high-flash solvent evaporates slowly due to multiple reasons. The total amount of petroleum resin added in the present invention cannot exceed 20% of the total resin amount. There are many types of petroleum resins, generally including C9 petroleum resin, C5 petroleum resin, C9 / C5 copolymerized petroleum resin, and C5 hydrogenated petroleum resin, which can be used in some conventional low-flash alkyd coatings as needed. However, in the present invention, the main body can only choose C9 petroleum resin to ensure dryness. Some C5 petroleum resins have little effect on improving dryness, but have a certain anti-skinning function and can be used in the system. Under the condition of the same viscosity and no decrease in overall performance, it can increase the solid content by 3-5% and reduce VOC by about 30-50, but the overall VOC cannot reach an average level of less than 420g / L;

[0053] Regarding the selection of active diluents, some literature has reported that it is limited to low-flash-point alkyd coatings, but no relevant patents or literature applications have been found in high-flash-point alkyd coatings. Conventional low-flash-point alkyd coatings are relatively fast-drying, and adding a certain amount has little effect on the drying property. Some literature even mentions that even if the amount added to the conventional low-flash-point alkyd system reaches 10%, there is only a slight loss of drying property. The solvents used in the high-flash-point alkyd system are inherently slow-drying. This type of active diluent is equivalent to a solvent with a higher flash point. If it is added in the amount used in conventional low-flash-point alkyd coatings, it can effectively reduce VOC, but it will greatly reduce the drying property.

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

[0055]

[0056] From the above table, it can be seen that when adding high flash point alkyd resin alone to petroleum resin, although the drying property is greatly improved, too much addition will affect the recoatability. When the amount added does not affect the recoatability, the VOC reduction is limited. When only adding active diluent, although VOC can be reduced, the drying property is greatly reduced. The synergistic effect of the three can not only reduce the VOC to below 420 g / L, but also ensure that the overall performance (dryness, recoatability) is not significantly reduced.

[0057] 2. Selection of pigments and fillers: Pigments and fillers with low oil absorption and high gloss are preferred. Under normal construction viscosity, if there are too many pigments and fillers, the gloss will drop significantly and the recoatability will be better. If there are too few pigments and fillers, the overall solid content will be difficult to achieve, which is not conducive to reducing VOC. The overall principle is to add as many high-gloss and low-oil-absorption fillers as possible to reduce VOC and viscosity while ensuring the gloss is greater than 80 degrees, rather than simply adding more pigments and fillers to achieve the purpose of reducing VOC.

[0058] 3. Solvent selection: While ensuring solubility, choose a low-density solvent to reduce VOC and balance the construction viscosity. Low-naphthalene S-150 aromatic solvent has strong solubility, but a relatively large specific gravity. Adding too much solvent can easily cause 24h recoating and bottom biting. D60 solvent has weak solubility and a light specific gravity, but has a slight VOC reduction effect. It is relatively difficult to bite the bottom when recoating. Under the premise of ensuring solubility, adding a light-density solvent can also effectively reduce VOC and ensure recoating to a certain extent.

[0059] 4. The combination of different driers is designed for each color pigment to achieve the best performance balance under the premise of ensuring drying and recoating properties. Compared with the selected high flash point alkyd paint, due to its longer open time, the amount of driers can be increased appropriately without affecting the distinctness of image and ensuring recoating properties; and the increase of pigments and fillers can reduce the amount of driers. The best ratio between the two is confirmed through experiments to ensure drying and recoating properties.

[0060] The present invention mainly starts from these four points. Through scientific and reasonable formula design, on the basis of high flash point alkyd paint, through innovative material combination, and the auxiliary synergistic effect of multiple technical means, VOC is reduced from about 450 g / L to about 380 g / L, and a high flash point alkyd paint with VOC lower than 420 g / L is prepared. Because the main resin is a high flash point alkyd resin with suitable viscosity, good dryness and recoatability, some disadvantages caused by the use of high solid and low viscosity high flash point alkyd resin are avoided. Compared with conventional high-performance high flash point alkyd paint, the overall performance is not significantly reduced, and it still meets the relevant requirements of GB / T 25251-2010 (alkyd resin paint). Compared with competing products on the market and related patented products disclosed, the technical problems of poor construction performance and easy bottom biting after 24h recoating are solved. Currently, there are no such products with the performance of "no abnormality in 24h recoatability" in the known related patents and competing products on the market.

[0061] The high-flash point alkyd coating with a VOC lower than 420 g / L prepared by the present invention has poor construction performance, slow drying, and easy bottom biting when recoating, compared with the traditional low-flash point high-VOC alkyd coating, the product prepared by the present invention has good construction performance, and the surface effect, drying, and recoating properties of the paint film meet the standard GB / T25251-2010 alkyd resin coating recommended by conventional alkyd coatings. At the same time, as a high-flash point alkyd coating, it belongs to the category of non-hazardous chemicals and can be stored and transported as general chemicals. VOC is lower than 420 g / L, responding to the requirements of the national environmental protection policy, avoiding the consumption tax on coatings, and offsetting the cost increase to a certain extent. The overall limit of harmful substances is strictly implemented in accordance with the provisions of GB 30981-2020 on the limit of harmful substances in industrial protective coatings or better than the standard. DETAILED DESCRIPTION

[0062] In order to make the application, technical scheme and advantages of the present invention more clear, the present invention is described in detail in conjunction with specific embodiments. It should be understood that the embodiments are only used to illustrate the present invention, but not to limit the protection scope of the present invention. All simple improvements to the preparation method of the present invention under the premise of the concept of the present invention belong to the protection scope of the present invention.

[0063] Examples 1#-4# A high flash point alkyd coating with a VOC lower than 420 g / L and a preparation method thereof

[0064] A high flash point alkyd paint with a VOC of less than 420 g / L, comprising the following components in parts by weight:

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

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

[0067] The C9 petroleum resin is L-130 produced by Chillon Chemical.

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

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

[0070] The dicyclopentadienyloxyethyl methacrylate is a reactive diluent and is a product of Shandong Ruibolong Chemical Technology Co., Ltd.

[0071] The 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 drier is EC-10 from Changfeng Chemical;

[0074] The 12% zirconium isooctanoate drier is 827-1 from Changfeng Chemical;

[0075] The 4% calcium isooctanoate drier is 824-2D from Changfeng Chemical; and

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

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

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

[0079] The dispersant is BYK108 from BYK Chemicals;

[0080] The defoamer is BYK-051 from BASF Chemicals;

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

[0082] The preparation method thereof comprises the following preparation steps:

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

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

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

[0086] The basic idea and formulation composition of the high flash point alkyd coating with a VOC lower than 420 g / L and the preparation method thereof of the present invention are as follows:

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

[0088]

[0089] Table 2 Performance table of various embodiments of the present invention

[0090]

[0091]

[0092]

[0093] From the performance of each embodiment in the above table, the present invention is a high flash point alkyd coating with a VOC lower than 420 g / L, a flash point greater than 60°C, a VOC reaching a predetermined value lower than 420 g / L, about 380±10 g / L, and a performance standard that meets or partially exceeds the recommended standard GB / T 25251-2010 (alkyd resin coating), and the overall harmful substance limit is strictly in accordance with the provisions of GB 30981-2020 (limit of harmful substances in industrial protective coatings) and is better than the standard. The viscosity is moderate and can be directly applied by brush, the high gloss surface effect is good, the storage stability is excellent (no skinning at 50°C for 30 days) is better than the standard (no skinning at 50°C for 48h), and the recoatability meets the GB / T25251-2010 standard (there are currently no related patented products or competing products on the market that meet this performance), which solves the problem that the currently known high flash point low VOC alkyd coating patent products or common competing products on the market have direct construction difficulties, poor drying properties, and easy bottom biting after 24h recoating.

[0094] To sum up, the above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the disclosed technical content are regarded as equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

[0095] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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] The experimental methods without specific conditions in the present invention are usually carried out under conventional conditions or conditions recommended by the manufacturer.

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

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

[0099] Experimental methods without specific conditions specified in the instructions and examples are usually carried out under conventional conditions or conditions recommended by the manufacturers.

[0100] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any method and material similar or equivalent to the described content can be applied to the method of the present invention.

Claims

1. A high flash point alkyd paint with a VOC of less than 420 g / L, Features: It includes the following components by weight: 39-42 parts of high flash point alkyd resin, 5-8 parts of 65% petroleum resin liquid, 1-5 parts of dicyclopentadienyloxyethyl methacrylate, 1-20 parts of various environmentally friendly pigments, 16-36 parts of ultrafine barium sulfate, 0.2-0.6 parts of organic bentonite, 0.2-1 parts of dispersant, 0.1-0.2 parts of defoaming agent, 0.12-0.2 parts of 10% cobalt isooctanoate drier, 0.5-1 parts of 12% zirconium isooctanoate drier, 0.5-1 parts of 4% calcium isooctanoate drier, 3-8 parts of low naphthalene S-150 aromatic solvent, 6-12 parts of D60 environmentally friendly solvent, 0.2-0.5 parts of anti-skinning agent, the total mass is 100 parts.

2. A high flash point alkyd paint having a VOC of less than 420 g / L according to claim 1, Features: The high flash point alkyd resin is 1207-70 from Changxing Chemical.

3. A high flash point alkyd paint having a VOC of less than 420 g / L according to claim 1, Features: The 65% petroleum resin liquid is C9 petroleum resin: C5 petroleum resin in a mass ratio of 5:1, which is pre-dissolved in a low-naphthalene S-150 aromatic solvent to form a resin liquid with a solid content of 65% by mass.

4. A high flash point alkyd paint having a VOC of less than 420 g / L according to claim 1, Features: The dicyclopentadienyloxyethyl methacrylate is a reactive diluent and is a product of Shandong Ruibolong Chemical Technology Co., Ltd.

5. A high flash point alkyd paint having a VOC of less than 420 g / L according to claim 1, Features: The 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. A high flash point alkyd paint having a VOC of less than 420 g / L according to claim 1, Features: The 10% cobalt isooctanoate drier is EC-10 from Changfeng Chemical; and / or The 12% zirconium isooctanoate drier is 827-1 from Changfeng Chemical; and / or The 4% calcium isooctanoate drier is 824-2D from Changfeng Chemical.

7. A high flash point alkyd paint having a VOC of less than 420 g / L according to claim 1, Features: The various environmentally friendly pigments are pigments that meet national mandatory standards; The ultrafine barium sulfate is 10HB ultrafine barium sulfate in nanopowder form; and / or The organobentonite is HY bentonite from BYK Chemicals; and / or The dispersant is BYK108 from BYK Chemicals; and / or The defoamer is BYK-051 from BASF Chemicals; and / or The anti-skinning agent is methyl ethyl ketone oxime from Shanghai Liming Chemical Co., Ltd.

8. A high flash point alkyd paint having a VOC of less than 420 g / L according to claim 3, Features: The C9 petroleum resin is L-130 produced by Chillon Chemical; and / or The C5 petroleum resin adopts E-1304 produced by Shanghai Jinsen Petroleum Resin Co., Ltd.

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

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