A continuous production of unsaturated polyester resin device

Abstract

This utility model relates to the field of resin preparation, specifically to a continuous production apparatus for unsaturated polyester resin. The apparatus comprises a raw material conveying unit, a first tubular reactor, a second tubular reactor, and a third tubular reactor. Esterification occurs in the first tubular reactor, polycondensation occurs in the second tubular reactor, and cooling, dilution, and mixing occur in the third tubular reactor. The raw material conveying unit includes a saturated diacid storage tank, an unsaturated diacid storage tank, and a diol storage tank. A static mixer is provided between the raw material conveying unit and the first tubular reactor. A continuous azeotrope, a film evaporator, and a fine degassing tube bundle are sequentially provided between the first and second tubular reactors. A styrene storage tank and a polymerization inhibitor storage tank are provided on the third tubular reactor. The continuous production apparatus for unsaturated polyester resin provided by this invention can continuously produce unsaturated polyester resin, avoiding inconsistencies in the quality indicators of finished products between different batches. By setting up a continuous azeotrope, a film evaporator, and a fine degassing tube bundle, the moisture generated during esterification can be efficiently removed, ensuring that the acid value of the esterification reaction meets the standards.

Description

Technical Field

[0001] This utility model relates to the field of resin preparation, specifically to a continuous production apparatus for unsaturated polyester resin. Background Technology

[0002] Unsaturated polyester resin (UPR) is a crosslinkable thermosetting resin system formed by the condensation polymerization of unsaturated diacids (such as maleic anhydride) / saturated diacids (such as phthalic anhydride) and polyols (such as ethylene glycol and propylene glycol) to obtain unsaturated polyester prepolymers, which are then diluted with vinyl monomers (such as styrene). It possesses advantages such as good mechanical properties (tensile strength 50–90 MPa, high flexural strength), strong corrosion resistance (resistant to acids, alkalis, and salt spray, making it a commonly used anti-corrosion material in chemical production), easy processing (curing at room temperature with adjustable curing speed), and low price and high cost-effectiveness. Currently, traditional production of unsaturated polyester resin (UPR) is mostly batch-based with low automation, resulting in significant batch-to-batch product quality variations. Furthermore, during esterification, dehydration occurs in the same reactor, leading to incomplete water removal and high moisture content, causing the resin's acid value to fail to meet standards. Summary of the Invention

[0003] To overcome the problem of unstable UPR content in batch production, this invention provides a continuous production apparatus for unsaturated polyester resin.

[0004] In view of this, the present invention provides a continuous production apparatus for unsaturated polyester resin, comprising, in sequence, a raw material conveying unit, a first tubular reactor, a second tubular reactor, and a third tubular reactor. Esterification occurs in the first tubular reactor, polycondensation occurs in the second tubular reactor, and cooling, dilution, and mixing occur in the third tubular reactor. The raw material conveying unit includes a saturated diacid storage tank, an unsaturated diacid storage tank, and a diol storage tank. A static mixer is provided between the raw material conveying unit and the first tubular reactor. A continuous azeotropic reactor, a film evaporator, and a fine degassing tube bundle are sequentially provided between the first and second tubular reactors. A styrene storage tank and a polymerization inhibitor storage tank are provided on the third tubular reactor.

[0005] Preferably, the raw material conveying unit is equipped with a first metering valve, the unsaturated dicarboxylic acid storage tank is equipped with a second metering valve, and the diol storage tank is equipped with a third metering valve.

[0006] Preferably, the continuous azeotropic reactor is equipped with a xylene storage tank and a water receiving tank.

[0007] Preferably, the second tubular reactor is equipped with a second catalyst storage tank, and a fifth metering valve is installed on the outlet pipeline of the second catalyst storage tank.

[0008] Preferably, the styrene storage tank is equipped with a sixth metering valve.

[0009] Preferably, the continuous production apparatus for unsaturated polyester resin includes a first catalyst storage tank, and the outlet pipeline of the first catalyst storage tank is equipped with a fourth metering valve.

[0010] Preferably, the continuous production apparatus for unsaturated polyester resin includes a nitrogen storage tank, and the outlet pipeline of the nitrogen storage tank is equipped with a gas valve.

[0011] Preferably, the first catalyst storage tank contains an esterification catalyst, and the second catalyst storage tank contains a polycondensation catalyst.

[0012] Preferably, the esterification catalyst is toluenesulfonic acid, methyl toluenesulfonate, or sulfuric acid; the polycondensation catalyst is antimony trioxide or antimony glycol.

[0013] Preferably, the polymerization inhibitor storage tank contains a polymerization inhibitor, and a seventh metering valve is provided on the outlet pipeline of the polymerization inhibitor storage tank. The polymerization inhibitor is hydroquinone, p-tert-butylcatechol, MEHQ, or BHT.

[0014] The beneficial effects of this invention are as follows: This invention provides a continuous production apparatus for unsaturated polyester resin, comprising a raw material conveying unit, a first tubular reactor, a second tubular reactor, and a third tubular reactor. Esterification occurs in the first tubular reactor, polycondensation occurs in the second tubular reactor, and cooling, dilution, and mixing occur in the third tubular reactor. The raw material conveying unit includes a saturated diacid storage tank, an unsaturated diacid storage tank, and a diol storage tank. A static mixer is provided between the raw material conveying unit and the first tubular reactor. A continuous azeotropic reactor and a film evaporator are sequentially provided between the first tubular reactor and the degassing tube bundle. A styrene storage tank and a polymerization inhibitor storage tank are provided on the third tubular reactor. The continuous production apparatus for unsaturated polyester resin provided by this invention can continuously produce unsaturated polyester resin, avoiding the problem of inconsistent product quality indicators between different batches.

[0015] By setting up a continuous azeotrope, a falling film evaporator, and a fine degassing tube bundle, the water generated during esterification can be removed efficiently, ensuring that the acid value of the esterification reaction meets the standards. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of a continuous production apparatus for unsaturated polyester resin in an embodiment of this utility model.

[0018] The component names and their numbers in the diagram are as follows: 100. Continuous production equipment for unsaturated polyester resin; 1. Raw material conveying unit; 11. Saturated dicarboxylic acid storage tank; 111. First metering valve; 12. Unsaturated dicarboxylic acid storage tank; 121. Second metering valve; 13. Diol storage tank; 131. Third metering valve; 14. First catalyst storage tank; 141. Fourth metering valve; 15. Second catalyst storage tank; 151. Fifth metering valve; 16. Styrene storage tank; 161. Sixth metering valve; 17. Polymer inhibitor storage tank; 171. Seventh metering valve; 18. Xylene storage tank; 19. Nitrogen storage tank; 191. Gas valve; 2. Static mixer; 3. First tubular reactor; 4. Continuous azeotrope reactor; 41. Water receiving tank; 5. Falling film evaporator; 6. Fine degassing tube bundle; 7. Second tubular reactor; 8. Third tubular reactor; 81. Ninth metering valve; 9. Finished product drum. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] It should be noted that when a component is referred to as "connected to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this utility model.

[0023] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, a particular feature, structure, or characteristic may be combined in any suitable manner.

[0024] refer to Figure 1 As shown, the present invention provides a continuous production apparatus 100 for unsaturated polyester resin, comprising a raw material conveying unit 1, a first tubular reactor 3, a second tubular reactor 7, and a third tubular reactor 8. Esterification occurs in the first tubular reactor 3, polycondensation occurs in the second tubular reactor 7, and cooling, dilution, and mixing occur in the third tubular reactor 8. The raw material conveying unit 1 includes a saturated diacid storage tank 11, an unsaturated diacid storage tank 12, and a diol storage tank 13. The saturated diacid storage tank 11 is equipped with a first metering valve 111, the unsaturated diacid storage tank 12 is equipped with a second metering valve 121, and the diol storage tank 13 is equipped with a third metering valve 131. The first metering valve 111, the second metering valve 121, and the third metering valve 131 can precisely control the volume of fluid passing through, thereby controlling the proportion of saturated diacid, unsaturated diacid, and diol entering subsequent processes. A static mixer 2 is also provided between the raw material conveying unit 1 and the first tubular reactor 3. The raw materials in the raw material conveying unit 1 first enter the static mixer 2 through pipelines for mixing, and then enter the first tubular reactor 3 for reaction. A continuous azeotrope 4 and a falling film evaporator 5 are also sequentially provided between the first tubular reactor 3 and the fine degassing tube bundle 6. The continuous azeotrope 4 is used to separate the water generated in the esterification reaction. The continuous azeotrope 4 is equipped with a xylene storage tank 18 and a water receiving tank 41. The xylene storage tank 18 contains xylene, which is added to the continuous azeotrope 4 and heated with the water generated in the previous step to form an azeotrope for dehydration. The water receiving tank 41 is used to store the water carried out by the azeotrope. The falling film evaporator 5 is an evaporation device that utilizes the material to form a uniform thin film in the heating tube and completes evaporation during the film's descent. It is used to remove xylene and trace amounts of water.

[0025] In some embodiments, in order to remove as much water as possible from the esterification reaction in the second tubular reactor 7 and to keep the esterification product as low as possible in order to increase the acid value of the esterification product, a fine degassing tube bundle 6 is also provided between the film evaporator 5 and the second tubular reactor 7.

[0026] In some embodiments, a second catalyst storage tank 15 is provided on the second tubular reactor 7, and a fifth metering valve 151 is provided on the outlet pipeline of the second catalyst storage tank 15. The polycondensation catalyst stored in the second catalyst storage tank 15 enters the second tubular reactor 7, and the dehydrated esterified product undergoes a polycondensation reaction in the second tubular reactor 7 to generate a resin with a longer polyester chain. Preferably, the polycondensation catalyst is antimony trioxide or antimony glycolide.

[0027] In some embodiments, a styrene storage tank 16 is provided on the third tubular reactor 8. Styrene stored in the styrene storage tank 16 enters the third tubular reactor 8 and is mixed and diluted with the polycondensed resin entering the third tubular reactor 8 to obtain unsaturated polyester resin. A sixth metering valve 161 is provided on the outlet pipeline of the styrene storage tank 16, which can control and meter the amount of styrene entering the third tubular reactor 8. A polymerization inhibitor storage tank 17 is also provided on the third tubular reactor 8. A seventh metering valve 171 is provided on the outlet pipeline of the polymerization inhibitor storage tank 17. The polymerization inhibitor in the polymerization inhibitor storage tank 17 can prevent the unsaturated polyester resin from undergoing self-polymerization during storage and transportation. Preferably, the polymerization inhibitor is hydroquinone, p-tert-butylcatechol, MEHQ, or BHT.

[0028] In some embodiments, the continuous production apparatus 100 for unsaturated polyester resin further includes a finished product tank 9. A ninth metering valve 81 is provided on the connecting pipeline between the third tubular reactor 8 and the finished product tank 9. The prepared unsaturated polyester resin is metered and loaded into the finished product tank 9 for storage using the ninth metering valve 81.

[0029] In some embodiments, the raw material conveying unit 1 further includes a first catalyst storage tank 14, which stores a catalyst for the esterification reaction. A fourth metering valve 141 is provided on the outlet pipeline of the first catalyst storage tank 14 to control the amount of catalyst added for the esterification reaction. Preferably, the esterification catalyst is p-toluenesulfonic acid, methyl toluenesulfonate, or sulfuric acid.

[0030] In some embodiments, the continuous production unsaturated polyester resin apparatus 100 is further provided with a nitrogen storage tank 19. A gas valve 191 is provided on the outlet pipeline of the nitrogen storage tank 19. The nitrogen storage tank 19 is filled with high-pressure, dry nitrogen. Before feeding materials into the continuous production unsaturated polyester resin apparatus 100, the nitrogen in the nitrogen storage tank 19 is used to purge the entire equipment pipeline to remove air and moisture from the equipment.

[0031] The continuous production apparatus 100 for unsaturated polyester resin provided by this utility model first purges the apparatus with nitrogen storage tank 19 to remove air and moisture. Then, the proportions of saturated diacid, unsaturated diacid, and diol entering the static mixer 2 are controlled by the first metering valve 111, the second metering valve 121, and the third metering valve 131, respectively. After the raw materials are mixed in the static mixer 2, they enter the first tubular reactor 3 for esterification reaction. Then, they pass through the continuous azeotrope 4, the film evaporator 5, and the fine degassing tube bundle 6 in sequence to remove water. Then, they enter the second tubular reactor 7 and are mixed with the catalyst entering the second catalyst storage tank 15 on the second tubular reactor 7 for polycondensation reaction. The polycondensed resin then enters the third tubular reactor 8 and is mixed and diluted with the styrene entering the styrene storage tank 16 and the polymerization inhibitor entering the polymerization inhibitor storage tank 17 on the third tubular reactor 8 to obtain unsaturated polyester resin, which is then stored in the finished product tank 9.

[0032] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A continuous production apparatus for unsaturated polyester resin, characterized in that: The reactor consists of a raw material conveying unit (1), a first tubular reactor (3), a second tubular reactor (7), and a third tubular reactor (8). Esterification is carried out in the first tubular reactor (3), polycondensation is carried out in the second tubular reactor (7), and cooling, dilution, and mixing are carried out in the third tubular reactor (8). The raw material conveying unit (1) includes a saturated dicarboxylic acid storage tank (11), an unsaturated dicarboxylic acid storage tank (12), and a diol storage tank (13). A static mixer (2) is provided between the raw material conveying unit (1) and the first tubular reactor (3). A continuous azeotrope (4), a film evaporator (5), and a fine degassing tube bundle (6) are provided between the first tubular reactor (3) and the second tubular reactor (7). A styrene storage tank (16) and a polymerization inhibitor storage tank (17) are provided on the third tubular reactor (8).

2. The continuous production apparatus for unsaturated polyester resin according to claim 1, characterized in that: The raw material conveying unit (1) is provided with a first metering valve (111), the unsaturated dicarboxylic acid storage tank (12) is provided with a second metering valve (121), and the diol storage tank (13) is provided with a third metering valve (131).

3. The continuous production apparatus for unsaturated polyester resin according to claim 2, characterized in that: The continuous azeotrope (4) is equipped with a xylene storage tank (18) and a water receiving tank (41).

4. The continuous production apparatus for unsaturated polyester resin according to claim 3, characterized in that: The second tubular reactor (7) is equipped with a second catalyst storage tank (15), and a fifth metering valve (151) is installed on the outlet pipeline of the second catalyst storage tank (15).

5. The continuous production apparatus for unsaturated polyester resin according to claim 4, characterized in that: The styrene storage tank (16) is equipped with a sixth metering valve (161).

6. The continuous production apparatus for unsaturated polyester resin according to claim 5, characterized in that: The continuous production unit (100) for unsaturated polyester resin includes a first catalyst storage tank (14), and the outlet pipeline of the first catalyst storage tank (14) is equipped with a fourth metering valve (141).

7. The continuous production apparatus for unsaturated polyester resin according to claim 6, characterized in that: The continuous production unit (100) for unsaturated polyester resin includes a nitrogen storage tank (19), and the outlet pipeline of the nitrogen storage tank (19) is equipped with a gas valve (191).

8. The continuous production apparatus for unsaturated polyester resin according to claim 7, characterized in that: The first catalyst storage tank (14) contains an esterification catalyst, and the second catalyst storage tank (15) contains a polycondensation catalyst.

9. The continuous production apparatus for unsaturated polyester resin according to claim 8, characterized in that: The esterification catalyst is toluenesulfonic acid, methyl toluenesulfonate, or sulfuric acid; the polycondensation catalyst is antimony trioxide or antimony glycol.

10. The continuous production apparatus for unsaturated polyester resin according to claim 8, characterized in that: The polymerization inhibitor storage tank (17) contains a polymerization inhibitor, and a seventh metering valve (171) is provided on the outlet pipeline of the polymerization inhibitor storage tank (17). The polymerization inhibitor is hydroquinone, p-tert-butylcatechol, MEHQ or BHT.

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