Bio-based modified alkyd resin odorless coating and preparation method thereof
By combining bio-based modified alkyd resin with various raw materials and optimizing the preparation method, the environmental problems of traditional alkyd coatings have been solved, resulting in a coating that is odorless and long-lasting, with low VOCs and excellent mechanical properties, filling a technological gap in the industry.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- JIANGSU ZHONGJIANG TAIE BIOBASED MATERIALS CO LTD
- Filing Date
- 2026-03-12
- Publication Date
- 2026-05-05
AI Technical Summary
Traditional alkyd coatings rely on petrochemical resources and release large amounts of volatile organic compounds during construction, which harms health and pollutes the environment. Existing bio-based modified coatings have poor odor neutralization and insufficient durability, making it difficult to balance mechanical and environmental performance.
Using bio-based modified alkyd resin as the main component, combined with rutile titanium dioxide, precipitated barium sulfate, and odor-neutralizing solvents, the preparation method includes pre-dispersion, grinding, and paint mixing steps to ensure uniform mixing of all raw materials, resulting in a coating with good adhesion, flexibility, and abrasion resistance.
It has achieved coatings based on renewable bio-based raw materials, which have a long-lasting odor-neutralizing effect, low VOC emissions, and good mechanical and application properties, in line with the development trend of environmentally friendly coatings.
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Abstract
Description
Technical Field
[0001] This application relates to the field of coating technology, specifically to the field of alkyd resin coating technology, and in particular to a bio-based modified alkyd resin odor-neutralizing coating and its preparation method. Background Technology
[0002] In modern industry and daily life, coatings play a vital role, protecting surfaces from corrosion, abrasion, and other damage, while also serving a decorative function. Among these, alkyd resin coatings, due to their flexible formulation, strong adhesion, and high cost-effectiveness, have been widely used in construction, furniture, metal protection, and other fields. They not only enhance product protection and extend service life but also add aesthetic appeal, driving the development of related industries. However, with rising living standards and increased environmental awareness, the performance and environmental requirements for coatings are becoming increasingly stringent, highlighting some inherent problems with traditional alkyd resin coatings.
[0003] Traditional alkyd coating resins are mostly synthesized using petrochemical resources as raw materials. This not only relies on non-renewable resources but also easily releases large amounts of volatile organic compounds (VOCs) during application and curing, producing strong, pungent odors that harm human health and pollute the environment, failing to meet current environmental protection and odor-neutralizing requirements. To address this issue, bio-based modified alkyd resins have become a research hotspot. These resins use natural, renewable resources such as soybean oil and castor oil as raw materials, reducing reliance on petrochemical resources and decreasing VOC emissions. However, in practice, existing bio-based modification technologies are still imperfect, and the improved coatings often suffer from poor odor neutralization and prolonged odor retention. Furthermore, most odor-neutralizing coatings on the market only rely on physical odor masking or simple odor removal treatments, resulting in insufficient odor-neutralizing durability and difficulty in simultaneously achieving both mechanical and environmental performance.
[0004] Therefore, researching a modified alkyd resin coating that uses renewable bio-based materials as raw materials, has a long-lasting odor-neutralizing effect, low VOC emissions, and good mechanical properties can align with the development trend of environmentally friendly coatings, effectively fill the technological gap in the industry, and meet the actual needs of the market. Summary of the Invention
[0005] To address the aforementioned technical problems, this application provides a bio-based modified alkyd resin odor-neutralizing coating and its preparation method.
[0006] Firstly, this application provides a bio-based modified alkyd resin odor-neutralizing coating, which adopts the following technical solution:
[0007] A bio-based modified alkyd resin odor-neutralizing coating, the raw materials used include the following components in parts by weight: 55-70 parts bio-based modified alkyd resin, 10-20 parts rutile titanium dioxide, 10-20 parts precipitated barium sulfate, 6-12 parts odor-neutralizing solvent, 0.2-0.5 parts fumed silica, 0.3-0.5 parts wetting and dispersing agent, 0.3-0.6 parts high-efficiency composite drying agent, and 0.25-0.45 parts anti-skinning agent; the raw materials used in the bio-based modified alkyd resin include vegetable oil derivatives, cashew nut shell oil, sorbitol, and polybasic acids.
[0008] By adopting the above technical solution, this application uses bio-based modified alkyd resin as the main component, combined with rutile titanium dioxide, precipitated barium sulfate, odor-neutralizing solvents and other raw materials, to prepare a coating based on renewable bio-based raw materials. This coating has a long-lasting odor-neutralizing effect and low VOC emissions. The resulting coating has good adhesion and flexibility, as well as high hardness, good acid resistance, and excellent wear resistance. It also has good weather resistance and construction performance, which is in line with the development trend of environmentally friendly coatings, effectively fills the industry's technical gap, and meets market demand.
[0009] In this application, the bio-based modified alkyd resin uses plant oil derivatives, cashew nut shell oil, sorbitol and polyols as the main raw materials in a mixture. Vegetable oil derivatives possess excellent film-forming properties and flexibility. The long-chain structure of cashew nut shell oil not only enhances the drying properties of the resin but also allows it to crosslink with the double bonds of vegetable oil derivatives, increasing the crosslinking density and thus improving the resin's resistance to chemical corrosion and abrasion. The hydroxyl groups of cashew phenol can act as chain termination structures, effectively regulating the molecular weight of alkyd resins and preventing gelation during the reaction process. Cashew diol and 2-methyl cashew diol in cashew phenol can react with polybasic acids to form a spatial network structure through esterification. Sorbitol is a bio-based polyol. Compared to existing polyols such as pentaerythritol, it can significantly increase the proportion of bio-based substances in bio-based modified alkyd resins, resulting in alkyd resins with good versatility and low VOCs. This enables coatings to achieve a long-lasting odor-free effect, making them more environmentally friendly. Furthermore, sorbitol has a significantly higher proportion of polyols, allowing it to react chemically with polybasic acids, promoting the polymerization reaction of the resin and giving the coatings better hardness, adhesion, and drying resistance.
[0010] In a preferred embodiment, the weight ratio of the vegetable oil derivative, cashew nut shell oil, sorbitol and polyacid is (30-35):(2-6):(18-22):(9-10).
[0011] In a preferred embodiment, the vegetable oil derivative comprises soybean oil and arachidonic acid in a weight ratio of (4-6):1.
[0012] By adopting the above technical solution, this application uses a mixture of soybean oleic acid and arachidonic acid. On the one hand, traditional semi-drying soybean oleic acid ensures the drying speed of the resin; on the other hand, a certain amount of arachidonic acid is introduced to reduce the average content of double bonds, thereby improving the storage stability and aging performance of the alkyd resin. Furthermore, compared to linoleic acid, the soybean oleic acid used in this application can also be combined with cashew nut shell oil to produce alkyd resins with moderate properties, easily controllable viscosity, stable production processes, and high cost-effectiveness. If linoleic acid were used instead, although the drying speed and hardness of the alkyd resin would be faster, the high reactivity of cashew nut shell oil would lead to self-crosslinking reactions, causing problems such as difficulty in controlling viscosity, ultimately resulting in gelation of the alkyd resin, affecting its performance or even causing safety accidents.
[0013] Furthermore, this application optimizes the ratio of soybean oil acid and arachidonic acid to maintain a balance between the resin's surface drying time and resistance to accelerated aging. Excessive use of arachidonic acid slows down the resin's surface drying time, while insufficient use results in poor resistance to accelerated aging.
[0014] In a preferred embodiment, the polybasic acid comprises terephthalic acid and biomass polybasic acid in a weight ratio of 1:(0.05-0.07).
[0015] By adopting the above technical solution, this application uses a mixture of terephthalic acid and biomass polyacids, which can introduce unsaturated double bonds and longer alkyl branches into the main chain of alkyd resin. This increases the number of crosslinking points during film curing and deepens the entanglement of molecular chains, thereby further improving the overall performance of alkyd resin. The biomass polyacid in this application is a mixture of oleic acid dimer and trimer and a small amount of monoacid, wherein the dimer accounts for approximately 78%, the trimer accounts for approximately 18%, and the monoacid accounts for approximately 4%.
[0016] In a preferred embodiment, the raw materials used in the bio-based modified alkyd resin further include trimethylolpropane, and the amount of trimethylolpropane used is 0.3-0.5% of the total weight of the raw materials used in the bio-based modified alkyd resin.
[0017] By adopting the above technical solution, this application further adds trimethylolpropane with three hydroxyl groups, which enables the synthesized alkyd resin to have a more appropriate crosslinking density and stability, thereby improving the overall performance of the coating.
[0018] In a preferred embodiment, the rutile titanium dioxide is chloride-processed rutile titanium dioxide.
[0019] By adopting the above technical solution, this application uses rutile titanium dioxide produced by the chloride process, which has the characteristics of low energy consumption in raw material production, environmental friendliness, and high product quality.
[0020] In a preferred embodiment, the odor-neutralizing solvent is one or more of D60 solvent, EGDA solvent, PGDA solvent, and DBE solvent.
[0021] By adopting the above technical solution, this application selects one or more of D60 solvent, EGDA solvent, PGDA solvent, and DBE solvent as odor-neutralizing solvent. These odor-neutralizing solvents have the characteristics of low toxicity, low odor, high solubility, and biodegradability, which can effectively replace traditional high-toxicity solvents, so that the coating has a long-lasting odor-neutralizing effect and improve the environmental friendliness and construction safety of the product.
[0022] In a preferred embodiment, the high-efficiency composite drying agent is one or more of the following: metal oxides or salts of cobalt, manganese, calcium, iron, and zinc, as well as rare earth catalysts.
[0023] By adopting the above technical solution, this application selects one or more of the following metal oxides or salts: cobalt, manganese, calcium, iron, and zinc, as well as rare earth catalysts, as a high-efficiency composite drying agent. This can accelerate the evaporation of solvents and the oxidative polymerization reaction rate of resin in bio-based modified alkyd resin odor-neutralizing coatings, thereby shortening the drying time of the coating and improving construction efficiency.
[0024] In a preferred embodiment, the anti-skinning agent is an oxime-based anti-skinning agent.
[0025] By adopting the above technical solution, this application selects oxime-based anti-skinning agents as anti-skinning agents for bio-based modified alkyd resin odor-neutralizing coatings, which can prevent the coating from forming a skin during storage and use, ensure that the coating does not form a skin in the container for 48 hours, and guarantee the normal use and performance stability of the coating.
[0026] Secondly, this application provides a method for preparing a bio-based modified alkyd resin odor-neutralizing coating, which employs the following technical solution:
[0027] A method for preparing a bio-based modified alkyd resin odor-neutralizing coating includes the following steps:
[0028] (1) Pre-dispersion stage: At a speed of 500-600 r / min, mix and stir part of the deodorizing solvent and part of the bio-based modified alkyd resin for 5-10 min, then add fumed silica, stir at a speed of 200-300 r / min until the fumed silica is completely dissolved, then add wetting and dispersing agent, adjust the speed to 800-1000 r / min, stir at high speed for 5-10 min, then add rutile titanium dioxide and precipitated barium sulfate and continue stirring until the slurry is uniform.
[0029] (2) Grinding stage: Grind the material obtained in step (1) 1-2 times at a flow rate of 800-1000 kg / h, and check the fineness ≤30 μm;
[0030] (3) Paint mixing stage: At a speed of 300-500 r / min, mix and stir the remaining bio-based modified alkyd resin and high-efficiency composite drying agent for 5-10 min, then add the remaining deodorizing solvent to adjust the viscosity of the system, and then add the anti-skinning agent and continue stirring for 10-15 min to obtain the bio-based modified alkyd resin deodorizing coating.
[0031] By adopting the above technical solution, this application utilizes specific pre-dispersion, grinding, and paint mixing steps to prepare a bio-based modified alkyd resin odor-neutralizing coating, which enables the raw materials to be fully and uniformly mixed. The mixing at different speeds during the pre-dispersion stage helps to completely dissolve fumed silica and uniformly disperse the slurry. The grinding stage controls the flow rate and number of grinding cycles to ensure that the fineness meets the standards. The paint mixing stage involves reasonable stirring and viscosity adjustment, ultimately resulting in a bio-based modified alkyd resin odor-neutralizing coating with good adhesion, flexibility, high hardness, acid resistance, abrasion resistance, weather resistance, and workability, as well as a long-lasting odor-neutralizing effect and low VOC emissions.
[0032] In summary, the present invention has the following beneficial effects:
[0033] 1. The odor-neutralizing coating of this application uses bio-based modified alkyd resin, with vegetable oil derivatives, cashew nut shell oil, sorbitol and other raw materials as raw materials, which greatly increases the proportion of bio-based raw materials, reduces dependence on petrochemical non-renewable resources, reduces VOCs emissions, and has a long-lasting odor-neutralizing effect.
[0034] 2. The odor-free coating of this application has good adhesion, flexibility, high hardness, good acid resistance, excellent wear resistance, weather resistance and good workability, and takes into account both mechanical properties and environmental protection performance;
[0035] 3. The preparation method of this application can fully and uniformly mix all raw materials in the odor-neutralizing coating, and the preparation method is simple, easy to operate, and suitable for large-scale industrial production. Detailed Implementation
[0036] The present invention will be further described in detail below with reference to the embodiments. All reagents, unless otherwise specified, are commercially available conventional reagent products.
[0037] The biomass polyacids used in this application were purchased from Anhui Hongtai New Materials Co., Ltd. The biomass polyacids are a mixture of oleic acid dimers and trimers and a small amount of monoacids, wherein the dimers account for about 78%, the trimers account for about 18%, and the monoacids account for about 4%.
[0038] The rutile titanium dioxide used in this application is chloride-process rutile titanium dioxide, purchased from DuPont, model R104.
[0039] The deodorizing solvent in this application is illustrated using DBE solvent as an example.
[0040] The high-efficiency composite drying agent described in this application is illustrated using Changfeng ZHV-8 from the ZHV series as an example. It is a high-efficiency and environmentally friendly drying agent composed of rare earth (lanthanum, cerium), manganese, calcium and other metals.
[0041] The anti-skinning agent of this application is an oxime-based anti-skinning agent, specifically methyl ethyl ketone oxime.
[0042] The wetting and dispersing agent in this application is VOK. ® - We will use Disper 1 as an example for explanation.
[0043] The preparation method of the bio-based modified alkyd resin in this application is a conventional preparation method in the art. In the specific embodiments of this application, only one example is provided for illustration.
[0044] <Preparation Example 1.1>
[0045] A bio-based modified alkyd resin, the raw materials of which include 30 kg of vegetable oil derivatives, 2 kg of cashew nut shell oil, 18 kg of sorbitol, 9 kg of polybasic acid, 8 kg of trimellitic anhydride, 21 kg of solvent SA-1000, and 0.044 kg of catalyst dibutyltin oxide.
[0046] Among them, the vegetable oil derivatives include soybean oil and arachidonic acid in a weight ratio of 4:1. The iodine value of soybean oil is 130g / 100g and the acid value is 200mgKOH / g. The iodine value of arachidonic acid is 90g / 100g and the acid value is 180mgKOH / g.
[0047] Polybasic acids include terephthalic acid and biomass polybasic acids in a weight ratio of 1:0.05;
[0048] The preparation method of this bio-based modified alkyd resin includes the following steps:
[0049] S1. Add a portion of soybean oleic acid, all of arachidonic acid, all of cashew shell oil, all of terephthalic acid, all of biomass polyacids, all of sorbitol, all of trimellitic anhydride, and all of the catalyst dibutyltin oxide to a reaction vessel. Add an appropriate amount of xylene as a reflux solvent. Stir occasionally until the materials are evenly mixed. Then, start stirring at 300 r / min. Heat to 170℃ and hold for 1 hour. Continue heating to 180℃ and hold for 1 hour. Then, heat to 210℃ and hold for 1 hour. Finally, heat to 240℃ and hold for 2 hours. Then, start sampling and testing. When the acid value is 9-12 mg KOH / g, immediately cool down to below 190℃ and add the remaining soybean oleic acid to raise the temperature.
[0050] S2. After heating to 230-240℃, keep warm for 2 hours, collect the esterification water, add a small amount of reflux solvent as needed, and take samples for testing. Test once every 1 hour. In the final stage, the testing time needs to be shortened. When the acid value is ≤10mgKOH / g, start cooling down. Cool down to below 160℃, add solvent SA-1000 and stir evenly to obtain bio-based modified alkyd resin.
[0051] <Preparation Example 1.2>
[0052] The difference from Preparation Example 1.1 is that the bio-based modified alkyd resin uses raw materials including 33 kg of vegetable oil derivatives, 4 kg of cashew nut shell oil, 20 kg of sorbitol, 9.5 kg of polybasic acids, 10 kg of trimellitic anhydride, 27 kg of solvent SA-1000, and 0.052 kg of catalyst dibutyltin oxide. The vegetable oil derivatives include soybean oil acid and arachidonic acid in a weight ratio of 5:1; the polybasic acids include terephthalic acid and biomass polybasic acids in a weight ratio of 1:0.06; the rest are the same as in Preparation Example 1.1.
[0053] <Preparation Example 1.3>
[0054] The difference from Preparation Example 1.1 is that the bio-based modified alkyd resin uses raw materials including 35 kg of vegetable oil derivatives, 6 kg of cashew nut shell oil, 22 kg of sorbitol, 10 kg of polybasic acids, 13 kg of trimellitic anhydride, 32 kg of solvent SA-1000, and 0.059 kg of catalyst dibutyltin oxide; wherein, the vegetable oil derivatives include soybean oil acid and arachidonic acid in a weight ratio of 6:1; the polybasic acids include terephthalic acid and biomass polybasic acids in a weight ratio of 1:0.076; the rest are the same as in Preparation Example 1.1.
[0055] <Preparation Example 2.1>
[0056] The difference from Preparation Example 1.1 is that arachidonic acid is removed, and all vegetable oil derivatives are soybean oilic acid; otherwise, they are the same as in Preparation Example 1.1.
[0057] <Preparation Example 2.2>
[0058] The difference from Preparation Example 1.1 is that the weight ratio of soybean oil acid and arachidonic acid is 1:1, while the rest is the same as Preparation Example 1.1.
[0059] <Preparation Example 2.3>
[0060] The difference from Preparation Example 1.1 is that the weight ratio of soybean oil acid to arachidonic acid is 8:1, while the rest is the same as Preparation Example 1.1.
[0061] <Preparation Example 2.4>
[0062] The difference from Preparation Example 1.1 is that soybean oil acid is replaced with linoleic acid, and the rest is the same as Preparation Example 1.1.
[0063] <Preparation Example 3.1>
[0064] The difference from Preparation Example 1.1 is that the biomass polybasic acid is removed, and all polybasic acids are terephthalic acid; otherwise, they are the same as in Preparation Example 1.1.
[0065] <Preparation Example 4.1>
[0066] The difference from Preparation Example 1.1 is that 0.3 kg of trimethylolpropane was added to the raw materials used, and the rest were the same as in Preparation Example 1.1.
[0067] <Preparation Example 4.2>
[0068] The difference from Preparation Example 1.1 is that 0.5 kg of trimethylolpropane was added to the raw materials used, and the rest were the same as in Preparation Example 1.1.
[0069] <Comparative Preparation Example 1>
[0070] The difference from Preparation Example 1.1 is that cashew shell oil is removed, but otherwise it is the same as Preparation Example 1.1.
[0071] <Comparative Preparation Example 2>
[0072] The difference from Preparation Example 1.1 is that sorbitol is replaced with pentaerythritol, and the rest is the same as Preparation Example 1.1.
[0073] <Example 1.1>
[0074] A bio-based modified alkyd resin odor-neutralizing coating, comprising 70 kg of the bio-based modified alkyd resin prepared in Preparation Example 1.1, 10 kg of rutile titanium dioxide produced by the chloride process, 10 kg of precipitated barium sulfate, 6 kg of DBE solvent, and 0.3 kg of wetting and dispersing agent VOK. ® -Disper 1, 0.2kg fumed silica, 0.6kg high-efficiency composite drying agent ZHV-8, 0.45kg methyl ethyl ketone oxime;
[0075] The preparation method of this bio-based modified alkyd resin odor-neutralizing coating includes the following steps:
[0076] (1) Pre-dispersion stage: At a speed of 500 r / min, mix and stir part of the deodorizing solvent and part of the bio-based modified alkyd resin for 5 min, then add fumed silica, stir at a speed of 200 r / min until the fumed silica is completely dissolved, then add wetting and dispersing agent, adjust the speed to 800 r / min, stir at high speed for 5 min, then add rutile titanium dioxide and precipitated barium sulfate and continue stirring until the slurry is uniform.
[0077] (2) Grinding stage: Grind the material obtained in step (1) once at a flow rate of 800 kg / h and check that the fineness is ≤30 μm;
[0078] (3) Paint mixing stage: At a speed of 300 r / min, the remaining bio-based modified alkyd resin and high-efficiency composite drying agent are mixed and stirred for 5 min. Then, the remaining deodorizing solvent is added to adjust the viscosity of the system. After that, the anti-skinning agent is added and stirred for another 10 min to obtain the bio-based modified alkyd resin deodorizing coating.
[0079] <Example 1.2>
[0080] A bio-based modified alkyd resin odor-neutralizing coating, the raw materials of which include 65 kg of the bio-based modified alkyd resin prepared in Preparation Example 1.2, 14 kg of rutile titanium dioxide prepared by the chloride process, 14 kg of precipitated barium sulfate, 8 kg of DBE solvent, and 0.35 kg of wetting and dispersing agent VOK. ® -Disper 1, 0.3kg fumed silica, 0.55kg high-efficiency composite drying agent ZHV-8, 0.4kg methyl ethyl ketone oxime;
[0081] The preparation method of this bio-based modified alkyd resin odor-neutralizing coating includes the following steps:
[0082] (1) Pre-dispersion stage: At a speed of 550 r / min, a portion of the deodorizing solvent and a portion of the bio-based modified alkyd resin were mixed and stirred for 8 min. Then, fumed silica was added and stirred at a speed of 250 r / min until the fumed silica was completely dissolved. Then, wetting and dispersing agent was added, the speed was adjusted to 900 r / min, and high-speed stirring was carried out for 8 min. After that, rutile titanium dioxide and precipitated barium sulfate were added and stirred until the slurry was uniform.
[0083] (2) Grinding stage: Grind the material obtained in step (1) twice at a flow rate of 900 kg / h, and check that the fineness is ≤30 μm;
[0084] (3) Paint mixing stage: At a speed of 400 r / min, the remaining bio-based modified alkyd resin and high-efficiency composite drying agent are mixed and stirred for 7 min. Then, the remaining deodorizing solvent is added to adjust the viscosity of the system. After that, the anti-skinning agent is added and stirred for 12 min to obtain the bio-based modified alkyd resin deodorizing coating.
[0085] <Example 1.3>
[0086] A bio-based modified alkyd resin odor-neutralizing coating, comprising 55 kg of the bio-based modified alkyd resin prepared in Preparation Example 1.3, 20 kg of rutile titanium dioxide produced by the chloride process, 20 kg of precipitated barium sulfate, 12 kg of DBE solvent, and 0.5 kg of wetting and dispersing agent VOK. ® -Disper 1, 0.5kg fumed silica, 0.3kg high-efficiency composite drying agent ZHV-8, 0.25kg methyl ethyl ketone oxime;
[0087] The preparation method of this bio-based modified alkyd resin odor-neutralizing coating includes the following steps:
[0088] (1) Pre-dispersion stage: At a speed of 600 r / min, a portion of the deodorizing solvent and a portion of the bio-based modified alkyd resin were mixed and stirred for 10 min. Then, fumed silica was added and stirred at a speed of 300 r / min until the fumed silica was completely dissolved. Then, wetting and dispersing agent was added, the speed was adjusted to 1000 r / min, and high-speed stirring was carried out for 10 min. After that, rutile titanium dioxide and precipitated barium sulfate were added and stirred until the slurry was uniform.
[0089] (2) Grinding stage: Grind the material obtained in step (1) twice at a flow rate of 1000 kg / h, and check that the fineness is ≤30 μm;
[0090] (3) Paint mixing stage: At a speed of 500 r / min, the remaining bio-based modified alkyd resin and high-efficiency composite drying agent are mixed and stirred for 10 min. Then, the remaining deodorizing solvent is added to adjust the viscosity of the system. After that, the anti-skinning agent is added and stirred for another 15 min to obtain the bio-based modified alkyd resin deodorizing coating.
[0091] <Example 2.1>
[0092] A bio-based modified alkyd resin odor-neutralizing coating differs from Example 1.1 in that the bio-based modified alkyd resin prepared in Preparation Example 1.1 is replaced with the bio-based modified alkyd resin prepared in Preparation Example 2.1, while the rest is the same as in Example 1.1.
[0093] <Example 2.2>
[0094] A bio-based modified alkyd resin odor-neutralizing coating differs from Example 1.1 in that the bio-based modified alkyd resin obtained in Preparation Example 1.1 is replaced with the bio-based modified alkyd resin obtained in Preparation Example 2.2, while the rest is the same as in Example 1.1.
[0095] <Example 2.3>
[0096] A bio-based modified alkyd resin odor-neutralizing coating differs from Example 1.1 in that the bio-based modified alkyd resin prepared in Preparation Example 1.1 is replaced with the bio-based modified alkyd resin prepared in Preparation Example 2.3, while the rest is the same as in Example 1.1.
[0097] <Example 2.4>
[0098] A bio-based modified alkyd resin odor-neutralizing coating differs from Example 1.1 in that the bio-based modified alkyd resin prepared in Preparation Example 1.1 is replaced with the bio-based modified alkyd resin prepared in Preparation Example 2.4, while the rest is the same as in Example 1.1.
[0099] <Example 3.1>
[0100] A bio-based modified alkyd resin odor-neutralizing coating differs from Example 1.1 in that the bio-based modified alkyd resin prepared in Preparation Example 1.1 is replaced with the bio-based modified alkyd resin prepared in Preparation Example 3.1, while the rest is the same as in Example 1.1.
[0101] <Example 4.1>
[0102] A bio-based modified alkyd resin odor-neutralizing coating differs from Example 1.1 in that the bio-based modified alkyd resin prepared in Preparation Example 1.1 is replaced with the bio-based modified alkyd resin prepared in Preparation Example 4.1, while the rest is the same as in Example 1.1.
[0103] <Example 4.2>
[0104] A bio-based modified alkyd resin odor-neutralizing coating differs from Example 1.1 in that the bio-based modified alkyd resin prepared in Preparation Example 1.1 is replaced with the bio-based modified alkyd resin prepared in Preparation Example 4.2, while the rest is the same as in Example 1.1.
[0105] <Comparative Example 1>
[0106] A bio-based modified alkyd resin odor-neutralizing coating differs from Example 1.1 in that the bio-based modified alkyd resin prepared in Preparation Example 1.1 is replaced with the bio-based modified alkyd resin prepared in Comparative Preparation Example 1, while the rest is the same as in Example 1.1.
[0107] <Comparative Example 2>
[0108] A bio-based modified alkyd resin odor-neutralizing coating differs from Example 1.1 in that the bio-based modified alkyd resin prepared in Preparation Example 1.1 is replaced with the bio-based modified alkyd resin prepared in Comparative Preparation Example 2, while the rest is the same as in Example 1.1.
[0109] <Performance Test>
[0110] After preparing samples of the odor-neutralizing coatings obtained in Examples 1.1-1.3 according to the same standard method, and using commercially available traditional alkyd coatings (which did not use bio-based modified alkyd resin, but used traditional alkyd resin) as a control, relevant performance tests were conducted, and the results are shown in Table 1.
[0111] Table 1 Performance Test Results
[0112]
[0113] As shown in Table 1, compared with commercially available traditional alkyd coatings, this application uses bio-based modified alkyd resin as the main component, combined with rutile titanium dioxide, precipitated barium sulfate, odor-neutralizing solvents, and other raw materials to produce a coating based on renewable bio-based raw materials. This coating has a long-lasting odor-neutralizing effect and low VOC emissions. The resulting coating has good adhesion and flexibility, as well as high hardness, good acid resistance, and excellent wear resistance. It also has good weather resistance and construction performance, which is in line with the development trend of environmentally friendly coatings, effectively fills the industry's technological gap, and meets market demand.
[0114] This application further compares the key performance indicators of Example 1.1 with those of other examples and comparative examples in Table 2. The relevant performance testing methods and indicators are the same as those described above.
[0115] Table 2 Comparison of Key Performance Indicators
[0116]
[0117] As shown in Table 2, in Example 2.1, the absence of arachidonic acid or the excessively low amount of arachidonic acid in Example 2.3, while shortening the drying time of the coating, significantly reduced its resistance to artificial aging. Conversely, in Example 2.2, the excessively high amount of arachidonic acid improved the resistance to artificial aging but significantly prolonged the drying time. Therefore, Example 1.1 optimized the ratio of arachidonic acid to soybean oil, achieving a balance between the drying speed and resistance to artificial aging. In Example 2.4, using linoleic acid instead of soybean oil resulted in excessively high reactivity of cashew nut shell oil, increasing the viscosity of the coating and negatively impacting its overall performance. In Example 3.1, the absence of biomass polyacids significantly affected various properties of the coating and reduced its biomass content.
[0118] The coatings prepared in Examples 4.1-4.2 have better properties than those in Example 1.1, indicating that the addition of trimethylolpropane in Examples 4.1-4.2 can further improve the properties of the coatings.
[0119] Comparative Example 1, without the addition of cashew nut shell oil, produced a coating with significantly inferior performance compared to Example 1.1, and also substantially reduced the biomass content. Comparative Example 2, by replacing sorbitol with pentaerythritol, not only significantly reduced the coating's performance but also increased its VOC content, affecting its odor-neutralizing effect, and resulted in a lower biomass content.
[0120] The embodiments described herein are merely illustrative of preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.
Claims
1. A bio-based modified alkyd resin odor-neutralizing coating, characterized in that, The raw materials used include the following components in parts by weight: 55-70 parts of bio-based modified alkyd resin, 10-20 parts of rutile titanium dioxide, 10-20 parts of precipitated barium sulfate, 6-12 parts of deodorizing solvent, 0.2-0.5 parts of fumed silica, 0.3-0.5 parts of wetting and dispersing agent, 0.3-0.6 parts of high-efficiency composite drying agent, and 0.25-0.45 parts of anti-skinning agent; the raw materials used in the bio-based modified alkyd resin include vegetable oil derivatives, cashew nut shell oil, sorbitol, and polybasic acids.
2. The bio-based modified alkyd resin odor-neutralizing coating according to claim 1, characterized in that, The weight ratio of the plant oil derivative, cashew shell oil, sorbitol and polyacids is (30-35):(2-6):(18-22):(9-10).
3. The bio-based modified alkyd resin odor-neutralizing coating according to claim 1, characterized in that, The vegetable oil derivatives include soybean oil and arachidonic acid in a weight ratio of (4-6):
1.
4. The bio-based modified alkyd resin odor-neutralizing coating according to claim 1, characterized in that, The polybasic acid includes terephthalic acid and biomass polybasic acid in a weight ratio of 1:(0.05-0.07).
5. The bio-based modified alkyd resin odor-neutralizing coating according to claim 1, characterized in that, The raw materials used in the bio-based modified alkyd resin also include trimethylolpropane, and the amount of trimethylolpropane used is 0.3-0.5% of the total weight of the raw materials used in the bio-based modified alkyd resin.
6. The bio-based modified alkyd resin odor-neutralizing coating according to claim 1, characterized in that, The rutile titanium dioxide mentioned is rutile titanium dioxide produced by the chloride process.
7. The bio-based modified alkyd resin odor-neutralizing coating according to claim 1, characterized in that, The deodorizing solvent is one or more of D60 solvent, EGDA solvent, PGDA solvent, and DBE solvent.
8. The bio-based modified alkyd resin odor-neutralizing coating according to claim 1, characterized in that, The high-efficiency composite drying agent is one or more of the following: metal oxides or salts of cobalt, manganese, calcium, iron, and zinc, as well as rare earth catalysts.
9. The bio-based modified alkyd resin odor-neutralizing coating according to claim 1, characterized in that, The anti-skinning agent is an oxime-based anti-skinning agent.
10. A method for preparing a bio-based modified alkyd resin odor-neutralizing coating according to any one of claims 1-9, characterized in that, Includes the following steps: (1) Pre-dispersion stage: At a speed of 500-600 r / min, mix and stir part of the deodorizing solvent and part of the bio-based modified alkyd resin for 5-10 min, then add fumed silica, stir at a speed of 200-300 r / min until the fumed silica is completely dissolved, then add wetting and dispersing agent, adjust the speed to 800-1000 r / min, stir at high speed for 5-10 min, then add rutile titanium dioxide and precipitated barium sulfate and continue stirring until the slurry is uniform. (2) Grinding stage: Grind the material obtained in step (1) 1-2 times at a flow rate of 800-1000 kg / h, and check the fineness ≤30 μm; (3) Paint mixing stage: At a speed of 300-500 r / min, mix and stir the remaining bio-based modified alkyd resin and high-efficiency composite drying agent for 5-10 min, then add the remaining deodorizing solvent to adjust the viscosity of the system, and then add the anti-skinning agent and continue stirring for 10-15 min to obtain the bio-based modified alkyd resin deodorizing coating.