Production device of water-soluble alkyd resin coating

Abstract

The utility model discloses a production device of a water-soluble alkyd resin coating, and relates to the technical field of coating production, an inlet of a pre-esterification kettle is respectively communicated with a polyhydric alcohol tank and a fatty acid tank, an outlet of the pre-esterification kettle is communicated with a re-esterification kettle, and an inlet of the re-esterification kettle is respectively communicated with a fatty acid tank, a hydrophilic monomer tank and a composite metal salt catalyst tank; an outlet of the re-esterification kettle is communicated with a reduced pressure distillation kettle through a pipeline, a top outlet of the reduced pressure distillation kettle is communicated with a first recovery tank through a pipeline, and a bottom outlet of the reduced pressure distillation kettle is communicated with a product tank through a pipeline. Through step-by-step esterification, the structure and molecular weight distribution of resin molecules can be better controlled, and the water solubility and stability of the water-soluble alkyd resin are improved. The reaction time is shortened and the energy consumption is reduced on the premise of ensuring the product quality, and no volatile organic solvent is added, so that the method is environment-friendly and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of paint production, specifically relates to a production device of water-soluble alkyd resin paint. BACKGROUND

[0002] Paint is indispensable supporting material for various departments of national economy, and is widely used in the decoration and protection of various buildings, various industrial products and tools, and the corrosion protection of various steel facilities such as wharfs, offshore oil drilling platforms, power transmission towers and the like. With the development of science and technology, the functions and application fields of paint are gradually improving and expanding, and the consumption level of paint has become an important indicator for measuring the economic development level of a country.

[0003] In the production process of traditional water-soluble alkyd resin paint, a large amount of organic solvent (such as dimethylbenzene, toluene, etc.) is usually used as a diluent and a dispersion medium. These organic solvents not only have volatility, which can cause air pollution and trigger environmental problems such as photochemical smog, but also have high cost, which increases the production cost of paint. SUMMARY

[0004] The technical problem to be solved by the utility model is that, in view of the deficiencies in the prior art, a production device of water-soluble alkyd resin paint is provided, which has low production cost and is friendly to the environment.

[0005] To solve the above technical problems, the technical scheme of the utility model is as follows:

[0006] A production device of water-soluble alkyd resin paint, comprising a pre-esterification kettle, the inlet of the pre-esterification kettle is connected with a polyol tank and a fatty acid tank through pipelines respectively, the outlet of the pre-esterification kettle is connected with a re-esterification kettle through a pipeline, the inlet of the re-esterification kettle is connected with the fatty acid tank, a hydrophilic monomer tank and a composite metal salt catalyst tank through pipelines respectively; the outlet of the re-esterification kettle is connected with a vacuum distillation kettle through a pipeline, the top outlet of the vacuum distillation kettle is connected with a first recovery tank through a pipeline, and the bottom outlet of the vacuum distillation kettle is connected with a product tank through a pipeline.

[0007] As an improved technical scheme, the inlet of the re-esterification kettle is connected with an antioxidant tank through a pipeline.

[0008] As an improved technical scheme, a Venturi mixer is arranged between the pre-esterification kettle and the re-esterification kettle, and the side inlets of the Venturi mixer are connected with the fatty acid tank and the hydrophilic monomer tank through pipelines respectively.

[0009] As an improved technical scheme, a first heater is arranged between the fatty acid tank and the Venturi mixer.

[0010] As an improved technical solution, a second heater is provided between the hydrophilic monomer tank and the Venturi mixer.

[0011] As an improved technical solution, the bottom outlet of the vacuum distillation kettle is connected to a thin-film evaporator via a pipe, the top outlet of the thin-film evaporator is connected to a second recovery tank via a pipe, and the bottom outlet of the thin-film evaporator is connected to the product tank via a pipe.

[0012] As an improved technical solution, the outlet of the first recovery tank is connected to the inlet of the polyol tank via a pipeline.

[0013] As an improved technical solution, the outlet of the second recovery tank is connected to the inlet of the polyol tank via a pipeline.

[0014] As an improved technical solution, the bottom outlet of the thin-film evaporator is connected to a neutralization tank via a pipe, the inlet of the neutralization tank is connected to a neutralizing agent tank via a pipe, and the bottom outlet of the neutralization tank is connected to the product tank via a pipe.

[0015] As an improved technical solution, the neutralization tank is equipped with an online pH sensor, and the online pH sensor and the switch valve at the bottom outlet of the neutralizing agent tank are interlocked to the control system.

[0016] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0017] This invention relates to a production apparatus for water-soluble alkyd resin coatings, comprising a pre-esterification kettle. The inlet of the pre-esterification kettle is connected via pipes to a polyol tank and a fatty acid tank. The outlet of the pre-esterification kettle is connected via pipes to a re-esterification kettle. The inlet of the re-esterification kettle is connected via pipes to the fatty acid tank, a hydrophilic monomer tank, and a composite metal salt catalyst tank. The outlet of the re-esterification kettle is connected via pipes to a vacuum distillation kettle. The top outlet of the vacuum distillation kettle is connected via pipes to a first recovery tank, and the bottom outlet of the vacuum distillation kettle is connected via pipes to a product tank. The polyol undergoes a pre-esterification reaction with a portion of the fatty acids, achieving an esterification degree of 60%-70%. Then, through the re-esterification kettle, the remaining fatty acids and hydrophilic monomers undergo a secondary esterification reaction. This stepwise esterification allows for better control of the resin molecule structure and molecular weight distribution, improving the water solubility and stability of the water-soluble alkyd resin. In addition, composite metal salt catalysts can significantly improve the esterification reaction rate, reduce the reaction temperature, and reduce the occurrence of side reactions. This shortens the reaction time and reduces energy consumption while ensuring product quality. Furthermore, the absence of volatile organic solvents makes it environmentally friendly and reduces costs.

[0018] The inlet of this re-esterification reactor is connected to an antioxidant tank via a pipeline. This effectively prevents resin oxidation and discoloration, ensuring product quality and extending product shelf life.

[0019] A Venturi mixer is provided between the pre-esterification vessel and the re-esterification vessel. The side inlet of the Venturi mixer is connected to the fatty acid tank and the hydrophilic monomer tank via pipes. The Venturi mixer can efficiently mix the fatty acids and hydrophilic monomers, ensuring that they are fully and uniformly dispersed before entering the re-esterification vessel. This facilitates more uniform participation in the re-esterification reaction, improving reaction consistency and product quality stability.

[0020] A first heater is provided between the fatty acid tank and the Venturi mixer. Preheating the fatty acid with the first heater can improve its fluidity in the Venturi mixer, allowing it to mix better with the hydrophilic monomer. At the same time, it can accelerate the reaction initiation rate, shorten the overall reaction time, and improve production efficiency after entering the re-esterification reactor.

[0021] A second heater is provided between the hydrophilic monomer tank and the Venturi mixer. Heating the hydrophilic monomer enhances its fluidity, facilitating thorough mixing with fatty acids in the Venturi mixer. Furthermore, a suitable temperature helps the hydrophilic monomer participate more actively in the re-esterification reaction, promoting the effective introduction of hydrophilic groups onto the resin molecular chain and improving the resin's water solubility.

[0022] The bottom outlet of the vacuum distillation vessel is connected to a thin-film evaporator via a pipe. The top outlet of the thin-film evaporator is connected to a second recovery tank via a pipe, and the bottom outlet of the thin-film evaporator is connected to the product tank via a pipe. The vacuum distillation vessel first removes most of the low-boiling-point reaction byproducts and incompletely reacted raw materials, and then the thin-film evaporator further processes the substances, reducing the residual amount of the aforementioned organic matter to an extremely low level. The thin-film evaporator achieves efficient separation at a lower temperature, reducing the impact on resin performance. Simultaneously, the second recovery tank can recover residual organic solvents, improving resource utilization and reducing production costs.

[0023] The outlet of the first recovery tank is connected to the inlet of the polyol tank via a pipeline, and the outlet of the second recovery tank is also connected to the inlet of the polyol tank via a pipeline. By recirculating the organic solvents recovered through vacuum distillation and thin-film evaporation back to the polyol tank, the recycling of polyols is achieved, reducing raw material procurement costs and environmental pollution, thus aligning with the concept of green production.

[0024] The bottom outlet of the thin-film evaporator is connected to a neutralization tank via a pipe. The inlet of the neutralization tank is connected to a neutralizing agent tank via a pipe. The bottom outlet of the neutralization tank is connected to the product tank via a pipe. The resin after thin-film evaporation undergoes a neutralization reaction. By adding a neutralizing agent, not only can the acidic groups in the resin be neutralized to improve water solubility, but it can also participate in the crosslinking reaction during the coating film formation process, thereby improving the coating film performance and ensuring the quality of the final product.

[0025] The neutralization tank is equipped with an online pH sensor, which is interlocked with the switch valve at the bottom outlet of the neutralizing agent tank to the control system. The online pH sensor monitors the pH value of the neutralization reaction in real time and, through the control system and interlock with the switch valve at the bottom outlet of the neutralizing agent tank, can precisely control the amount of neutralizing agent added, ensuring that the pH value of the neutralization reaction remains stable between 7.5 and 8.5. This guarantees the stability of the resin and the application performance of the coating, improving the consistency of product quality. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0028] The components include: 1. Pre-esterification vessel; 2. Polyol tank; 3. Fatty acid tank; 4. Re-esterification vessel; 5. Hydrophilic monomer tank; 6. Composite metal salt catalyst tank; 7. Vacuum distillation vessel; 8. First recovery tank; 9. Product tank; 10. Antioxidant tank; 11. Venturi mixer; 12. First heater; 13. Second heater; 14. Thin-film evaporator; 15. Second recovery tank; 16. Neutralization tank; 17. Neutralizing agent tank; 18. Online pH sensor; 19. Switch valve. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] like Figure 1As shown, a production apparatus for water-soluble alkyd resin coatings includes a pre-esterification kettle 1. The inlet of the pre-esterification kettle 1 is connected to a polyol tank 2 and a fatty acid tank 3 via pipelines. The outlet of the pre-esterification kettle 1 is connected to a re-esterification kettle 4 via pipelines. The inlet of the re-esterification kettle 4 is connected to the fatty acid tank 3, a hydrophilic monomer tank 5, and a composite metal salt catalyst tank 6 via pipelines. The outlet of the re-esterification kettle 4 is connected to a vacuum distillation kettle 7 via a pipeline. The top outlet of the vacuum distillation kettle 7 is connected to a first recovery tank 8 via a pipeline. The bottom outlet of the vacuum distillation kettle 7 is connected to a product tank 9 via a pipeline. Polyols (such as glycerol and pentaerythritol) undergo a pre-esterification reaction with some fatty acids (castor oil fatty acids, soybean oil fatty acids, etc.) to achieve an esterification degree of 60%-70%. Then, in a re-esterification reactor (4), the remaining fatty acids and hydrophilic monomers (polyethylene glycol monomethyl ether acrylate) undergo a secondary esterification reaction. This stepwise esterification allows for better control of the resin molecule structure and molecular weight distribution, improving the water solubility and stability of the water-soluble alkyd resin. Furthermore, the composite metal salt catalyst (a mixture of zinc and zirconium salts) significantly increases the esterification reaction rate, lowers the reaction temperature, and reduces side reactions. This shortens the reaction time and reduces energy consumption while ensuring product quality. Moreover, the absence of volatile organic solvents makes it environmentally friendly and reduces costs.

[0031] The inlet of the re-esterification reactor 4 is connected to an antioxidant tank 10 via a pipeline. The antioxidant 2,6-di-tert-butyl-p-cresol can effectively prevent resin oxidation and discoloration, ensure product quality, and extend the product's shelf life.

[0032] A Venturi mixer 11 is provided between the pre-esterification vessel 1 and the re-esterification vessel 4. The side inlet of the Venturi mixer 11 is connected to the fatty acid tank 3 and the hydrophilic monomer tank 5 via pipes. The Venturi mixer 11 can efficiently mix fatty acids and hydrophilic monomers, ensuring that they are fully and uniformly dispersed before entering the re-esterification vessel 4. This facilitates more uniform participation in the re-esterification reaction, improving reaction consistency and product quality stability.

[0033] A first heater 12 is provided between the fatty acid tank 3 and the Venturi mixer 11. Preheating the fatty acid by the first heater 12 can improve the flowability of the fatty acid in the Venturi mixer 11, allowing it to mix better with the hydrophilic monomer. At the same time, it can accelerate the reaction initiation rate, shorten the overall reaction time, and improve production efficiency after entering the re-esterification kettle 4.

[0034] A second heater 13 is provided between the hydrophilic monomer tank 5 and the Venturi mixer 11. Heating the hydrophilic monomer can enhance its fluidity, facilitating thorough mixing with fatty acids in the Venturi mixer 11. Furthermore, a suitable temperature helps the hydrophilic monomer participate more actively in the re-esterification reaction, promoting the effective introduction of hydrophilic groups onto the resin molecular chain and improving the water solubility of the resin.

[0035] The bottom outlet of the vacuum distillation vessel 7 is connected to a thin-film evaporator 14 via a pipe. The top outlet of the thin-film evaporator 14 is connected to a second recovery tank 15 via a pipe. The bottom outlet of the thin-film evaporator 14 is connected to the product tank 9 via a pipe. The vacuum distillation vessel 7 first removes most of the low-boiling-point reaction byproducts and incompletely reacted raw materials, and then the thin-film evaporator 14 further processes them, reducing the residual amount of the above-mentioned organic substances to an extremely low level. The thin-film evaporator 14 performs efficient separation at a lower temperature, reducing the impact on resin performance. At the same time, the second recovery tank 15 can recover residual organic solvents, improving resource utilization and reducing production costs.

[0036] The outlet of the first recovery tank 8 is connected to the inlet of the polyol tank 2 via a pipeline, and the outlet of the second recovery tank 15 is also connected to the inlet of the polyol tank 2 via a pipeline. By returning the organic solvents recovered through vacuum distillation and thin-film evaporation to the polyol tank 2, the recycling of polyols is achieved, reducing raw material procurement costs and environmental pollution, thus aligning with the concept of green production.

[0037] The bottom outlet of the thin-film evaporator 14 is connected to a neutralization tank 16 via a pipe. The inlet of the neutralization tank 16 is connected to a neutralizing agent tank 17 via a pipe. The bottom outlet of the neutralization tank 16 is connected to the product tank 9 via a pipe. The resin after thin-film evaporation undergoes a neutralization reaction. By adding diethanolamine, not only can the acidic groups in the resin be neutralized to improve water solubility, but it can also participate in the crosslinking reaction during the coating film formation process, improving the coating performance and ensuring the quality of the final product.

[0038] The neutralization tank 16 is equipped with an online pH sensor 18, which is interlocked with the switch valve 19 at the bottom outlet of the neutralizing agent tank 17 to the control system. The online pH sensor 18 monitors the pH value of the neutralization reaction in real time and, through the control system and interlock with the switch valve 19 at the bottom outlet of the neutralizing agent tank 17, can precisely control the amount of neutralizing agent added, ensuring that the pH value of the neutralization reaction remains stable between 7.5 and 8.5, thus guaranteeing the stability of the resin and the application performance of the coating, and improving the consistency of product quality.

[0039] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A production apparatus for water-soluble alkyd resin coatings, characterized in that: The device includes a pre-esterification vessel, the inlet of which is connected to a polyol tank and a fatty acid tank via pipelines, and the outlet of which is connected to a re-esterification vessel via pipelines. The inlet of the re-esterification vessel is connected to the fatty acid tank, the hydrophilic monomer tank, and the composite metal salt catalyst tank via pipelines. The outlet of the re-esterification reactor is connected to a vacuum distillation reactor via a pipeline. The top outlet of the vacuum distillation reactor is connected to a first recovery tank via a pipeline. The bottom outlet of the vacuum distillation reactor is connected to a product tank via a pipeline.

2. The production apparatus for water-soluble alkyd resin coatings as described in claim 1, characterized in that: The inlet of the re-esterification reactor is connected to an antioxidant tank via a pipeline.

3. The production apparatus for water-soluble alkyd resin coatings as described in claim 1, characterized in that: A Venturi mixer is provided between the pre-esterification vessel and the re-esterification vessel. The side inlet of the Venturi mixer is connected to the fatty acid tank and the hydrophilic monomer tank through pipes.

4. The production apparatus for water-soluble alkyd resin coatings as described in claim 3, characterized in that: A first heater is provided between the fatty acid tank and the Venturi mixer.

5. The production apparatus for water-soluble alkyd resin coatings as described in claim 3, characterized in that: A second heater is provided between the hydrophilic monomer tank and the Venturi mixer.

6. The production apparatus for water-soluble alkyd resin coatings as described in claim 1, characterized in that: The bottom outlet of the vacuum distillation vessel is connected to a thin-film evaporator via a pipe, the top outlet of the thin-film evaporator is connected to a second recovery tank via a pipe, and the bottom outlet of the thin-film evaporator is connected to the product tank via a pipe.

7. The production apparatus for water-soluble alkyd resin coatings as described in claim 1, characterized in that: The outlet of the first recycling tank is connected to the inlet of the polyol tank via a pipeline.

8. The production apparatus for water-soluble alkyd resin coatings as described in claim 6, characterized in that: The outlet of the second recovery tank is connected to the inlet of the polyol tank via a pipeline.

9. The production apparatus for water-soluble alkyd resin coatings as described in claim 6, characterized in that: The bottom outlet of the thin-film evaporator is connected to a neutralization tank via a pipe, the inlet of the neutralization tank is connected to a neutralizing agent tank via a pipe, and the bottom outlet of the neutralization tank is connected to the product tank via a pipe.

10. The production apparatus for water-soluble alkyd resin coatings as described in claim 9, characterized in that: The neutralization tank is equipped with an online pH sensor, and the online pH sensor and the switch valve at the bottom outlet of the neutralizing agent tank are interlocked to the control system.

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