Low-odor automotive polyvinyl chloride weld joint sealant

Abstract

The invention relates to the technical field of sealants, in particular to a low-odor automotive polyvinyl chloride weld joint sealant which is prepared by the following specific steps: S1, preparing and premixing raw materials: S1.1, proportioning the raw materials: accurately weighing a plasticizer, compound fatty acid ester, a diluent, a tackifier, a thixotropic agent, an inorganic filler and a stabilizer according to a formula proportion, and uniformly mixing the raw materials, the plasticizer, the compound fatty acid ester, the diluent, the tackifier, the thixotropic agent, the inorganic filler and the stabilizer; and S1.2, adding the compound fatty acid ester: adding the compound fatty acid ester and the plasticizer into the premixing equipment, and stirring at a low speed to ensure that the compound fatty acid ester and the plasticizer are uniformly mixed to form the plasticizer compound liquid. The compound fatty acid ester mixture is added into the formula of the polyvinyl chloride weld joint sealant, so that the remarkable effect of low odor of a rubber strip after high-temperature curing is realized; the compound fatty acid ester mixture has excellent volatility and thermal stability, and can be quickly volatilized under a high-temperature condition, so that the generation of harmful gas is effectively reduced, and the air quality in a vehicle and a healthier and more comfortable riding environment are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment dispersant preparation, in particular to a low-odor polyvinyl chloride weld sealant for vehicles. Background Art

[0002] With the rapid development of the automobile industry, the safety, comfort and environmental protection of vehicles have become the focus of consumers. In the automobile manufacturing process, weld sealant, as an important auxiliary material, is widely used in the sealing of automobile body joints to prevent external factors such as water, dust and noise from entering the car, while enhancing the strength and stability of the body structure. With the increase in automobile production, the amount of PVC polyvinyl chloride weld sealant used in the car has also increased accordingly.

[0003] PVC polyvinyl chloride weld sealant is a paste sealant composed of plasticizer, complex fatty acid ester, diluent, viscosity enhancer, thixotropic agent, inorganic filler and stabilizer. It has good thixotropy. After heating and plasticization, it becomes an elastomer with a certain bonding strength. It has excellent wear resistance, flex resistance and chemical resistance. It has good bonding strength with electrophoretic primer, epoxy polyamide primer, etc. It is widely used in the sealing of internal and external welds of car bodies.

[0004] However, traditional PVC weld sealants produce a strong odor during the high-temperature curing process, which is mainly due to the volatilization and decomposition of certain ingredients in its formula at high temperatures. These harmful gases will not only have an adverse effect on the air quality in the car, making passengers feel uncomfortable, but may even cause potential harm to human health. In addition, the odor problem may also affect the overall quality and market competitiveness of the car.

[0005] In the prior art, although some formulas and preparation methods of low-odor weld sealants have been proposed, they still have some shortcomings in terms of odor reduction, sealing performance, weather resistance and aging resistance. Therefore, it is of great practical significance and application prospects to develop a polyvinyl chloride weld sealant that has both low-odor characteristics and good sealing, weather resistance and aging resistance.

[0006] In order to solve the above problems, researchers have been exploring and developing new low-odor weld sealants. The development of low-odor weld sealants not only requires the product to have excellent sealing performance, but also needs to produce lower odor during high-temperature curing to meet the requirements of environmental protection and comfort. At the same time, due to the particularity of the automotive industry, there are also high requirements for the weather resistance and aging resistance of weld sealants to ensure that they can maintain stable performance in various harsh environments. Summary of the invention

[0007] Technical issues solved

[0008] In view of the above-mentioned shortcomings of the prior art, the present invention provides a low-odor polyvinyl chloride weld sealant for automobiles. By adding a complex fatty acid ester mixture to the formula of traditional polyvinyl chloride weld sealant, a significant effect of low odor of the sealant strip after high-temperature curing is achieved. The complex fatty acid ester mixture has excellent volatility and thermal stability, can evaporate rapidly under high temperature conditions, effectively reduce the generation of harmful gases, and maintain good sealing performance. By accurately controlling the proportion of each component in the formula and the process parameters, it is ensured that the sealing strip can fit tightly to the joint of the automobile body after curing, effectively preventing the intrusion of external factors such as water, dust and noise, and improving the sealing and stability of the vehicle body structure, thereby significantly improving the air quality in the car and providing passengers with a more comfortable and healthy riding environment.

[0009] Technical Solution

[0010] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0011] A low-odor polyvinyl chloride weld sealant for vehicles, the specific steps of the sealant are:

[0012] S1. Raw material preparation and premixing:

[0013] S1.1, Raw material ratio: Accurately weigh plasticizer, complex fatty acid ester, diluent, tackifier, thixotropic agent, inorganic filler and stabilizer according to the formula ratio;

[0014] S1.2, adding compound fatty acid ester: adding compound fatty acid ester and plasticizer into the premixing device, stirring at a low speed to ensure that the two are evenly mixed to form a plasticizer composite liquid;

[0015] S1.3, raw material premixing: add part of the plasticizer compound liquid, diluent, viscosity enhancer, thixotropic agent, stabilizer in sequence, and continue stirring until the raw materials are evenly mixed;

[0016] S1.4, adding inorganic filler: gradually increase the stirring speed and add inorganic filler;

[0017] S1.5. Add polyvinyl chloride resin: Add polyvinyl chloride resin to the mixture and continue stirring until the resin is completely dispersed.

[0018] S2. Vacuum degassing:

[0019] S2.1, Vacuum degassing treatment: Turn on the vacuum pump to perform vacuum degassing treatment on the material to remove bubbles and volatile impurities in the material, and stir the material with negative pressure to make it more uniform;

[0020] S2.2. Monitor vacuum degree and degassing time: During the degassing process, the vacuum degree and degassing time should be monitored to ensure the degassing effect;

[0021] S2.3, Vacuum stirring: Vacuum the mixed materials to remove bubbles and ensure that the materials are mixed evenly.

[0022] S3. Sampling, testing and adjustment:

[0023] S3.1, Sampling and testing: adjust the viscosity by adding liquid materials for aging, and conduct sampling and testing, including viscosity, flow rate, adhesion, and odor;

[0024] S3.2, Adjustment: Adjust the content of the liquid material according to the test results, and perform vacuum stirring again until it reaches the qualified standard;

[0025] S3.3, qualified material discharge and barrel loading: after passing the inspection, the qualified mixture is extracted from the maturation kettle;

[0026] S3.4. Adjustment if unqualified: If the product fails the inspection, return and perform vacuuming and stirring again until it passes.

[0027] S4, screw pump extrusion canning:

[0028] S4.1. Extrusion filling: Use a screw pump to extract the qualified mixture from the aging kettle and extrude and fill it through an extruder.

[0029] Furthermore, the raw material ratios in S1.1 include the following components in parts by weight: plasticizer: 20-30 parts, complex fatty acid ester: 5-10 parts, diluent: 1-5 parts, viscosity enhancer: 0.5-2 parts, thixotropic agent: 20-30 parts, inorganic filler: 15-25 parts, stabilizer: 1-3 parts.

[0030] Furthermore, the S1.1 also contains 2-5 parts of polyamide to improve the adhesion and elasticity of the sealant, and 20-35 parts of PVC resin to increase the strength and toughness of the sealant.

[0031] Furthermore, the composite fatty acid ester mixture added in S1.2 is a mixture of multiple fatty acid esters, has excellent volatility and thermal stability, can significantly reduce the odor of the sealant during high-temperature curing, and is stirred at a low speed of 50 revolutions per minute.

[0032] Furthermore, the stirring time during the raw material premixing in S1.3 is 10-15 minutes, and the stirring speed is gradually increased from 50 revolutions per minute to 150 revolutions per minute.

[0033] Furthermore, after the inorganic filler is added to S1.4, the stirring speed is increased to 200 revolutions per minute, and the stirring time is 5-10 minutes.

[0034] Furthermore, in S2.2, the material is subjected to vacuum degassing treatment by applying an absolute pressure reaching a vacuum degree of -0.09 MPa, and the degassing time is continued for 10 minutes.

[0035] Furthermore, when adjusting the liquid content in S3.2, precise adjustment is performed according to the detection index to ensure that the performance of the sealant meets the requirements, and the time for vacuum stirring again is 5-10 minutes, and the vacuum degree is maintained at -0.08MPa to -0.1MPa.

[0036] Furthermore, the temperature of the polyvinyl chloride weld sealant is controlled below 40 degrees during the entire process.

[0037] Furthermore, the polyvinyl chloride weld sealant is added with a complex fatty acid ester mixture, applied to the car body and baked at 160 degrees for more than 30 minutes, thereby improving the odor problem after high-temperature baking without reducing the original mechanical properties of the polyvinyl chloride weld sealant, thereby effectively optimizing the odor in the car.

[0038] Beneficial Effects

[0039] Compared with the known public technology, the technical solution provided by the present invention has the following advantages:

[0040] Beneficial effects:

[0041] 1. The present invention achieves a significant effect of low odor of the sealant after high-temperature curing by adding a composite fatty acid ester mixture to the formula of the polyvinyl chloride weld sealant. The composite fatty acid ester mixture has excellent volatility and thermal stability, and can evaporate rapidly under high temperature conditions, thereby effectively reducing the generation of harmful gases, significantly improving the air quality in the car, and providing passengers with a healthier and more comfortable riding environment.

[0042] 2. The sealant of the present invention not only has low odor, but also has good sealing, weather resistance and aging resistance. These excellent properties enable the sealant to maintain stable performance for a long time, effectively prevent external factors such as water, dust and noise from entering the car, and at the same time enhance the strength and stability of the car body structure. The improvement of these comprehensive properties makes the sealant of the present invention more suitable for sealing the joints of automobile bodies, thereby improving the overall quality and service life of the car.

[0043] 3. The low-odor automotive polyvinyl chloride weld sealant of the present invention has good weather resistance and aging resistance after special formula design and process treatment, can maintain stable performance in various harsh environments, and is not prone to cracking, deformation or failure, thereby extending the service life of the sealant and reducing the cost of automobile maintenance and replacement. At the same time, the sealant also has good environmental performance and meets the requirements of sustainable development of the automotive industry. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the present invention is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] The present invention will be further described below in conjunction with the embodiments.

[0046] A low-odor polyvinyl chloride weld sealant for vehicles, the specific steps of the sealant are:

[0047] S1. Raw material preparation and premixing:

[0048] S1.1, Raw material ratio: Accurately weigh plasticizer, complex fatty acid ester, diluent, tackifier, thixotropic agent, inorganic filler and stabilizer according to the formula ratio;

[0049] S1.2, adding compound fatty acid ester: adding compound fatty acid ester and plasticizer into the premixing device, stirring at a low speed to ensure that the two are evenly mixed to form a plasticizer composite liquid;

[0050] S1.3, raw material premixing: add part of the plasticizer compound liquid, diluent, viscosity enhancer, thixotropic agent, stabilizer in sequence, and continue stirring until the raw materials are evenly mixed;

[0051] S1.4, adding inorganic filler: gradually increase the stirring speed and add inorganic filler;

[0052] S1.5. Add polyvinyl chloride resin: Add polyvinyl chloride resin to the mixture and continue stirring until the resin is completely dispersed.

[0053] S2. Vacuum degassing:

[0054] S2.1, Vacuum degassing treatment: Turn on the vacuum pump to perform vacuum degassing treatment on the material to remove bubbles and volatile impurities in the material, and stir the material with negative pressure to make it more uniform;

[0055] S2.2. Monitor vacuum degree and degassing time: During the degassing process, the vacuum degree and degassing time should be monitored to ensure the degassing effect;

[0056] S2.3, Vacuum stirring: Vacuum the mixed materials to remove bubbles and ensure that the materials are mixed evenly.

[0057] S3. Sampling, testing and adjustment:

[0058] S3.1, Sampling and testing: adjust the viscosity by adding liquid materials for maturation, and the tests include viscosity, flow rate, adhesion, and odor;

[0059] S3.2, Adjustment: Adjust the content of the liquid material according to the test results, and perform vacuum stirring again until it reaches the qualified standard;

[0060] S3.3, Qualified material discharge and barreling: After passing the inspection, use a screw pump to pump the qualified mixture out of the aging kettle and barrel it;

[0061] S3.4. Adjustment if unqualified: If the product fails the inspection, return and perform vacuuming and stirring again until it passes.

[0062] S4, screw pump extrusion canning:

[0063] S4.1. Extrusion filling: Use a screw pump to extract the qualified mixture from the aging kettle and extrude and fill it through an extruder.

[0064] Embodiment 1

[0065] The present embodiment focuses on improving the flexibility and aging resistance of low-odor automotive polyvinyl chloride weld sealant. The raw material ratio is: 23 parts of plasticizer, 5 parts of complex fatty acid ester, 2 parts of diluent, 0.5 parts of tackifier, 22 parts of thixotropic agent, 15 parts of inorganic filler, 1 part of stabilizer, as well as 2.8 parts of polyamide and 30.2 parts of PVC resin. In the premixing stage, the complex fatty acid ester and the plasticizer are first stirred at a speed of 200 revolutions per minute until uniform, and then other raw materials are gradually added, the stirring speed is increased to 225 revolutions per minute, and stirring is continued for 16 minutes. In the degassing stage, degassing is carried out at a vacuum degree of -0.09MPa for 12 minutes, and the viscosity is adjusted by adding liquid material for aging, and sampling is carried out to detect viscosity, flow rate, adhesion, and odor. If the inspection fails, it is returned and vacuumed and stirred again until it is qualified. After the inspection is qualified, a screw pump is used to extract the qualified mixture from the aging kettle, and extrusion and filling are carried out through an extruder.

[0066] Embodiment 2

[0067] This embodiment describes in detail the preparation process of low-odor automotive polyvinyl chloride weld sealant. First, raw materials are prepared according to the following ratio: 24 parts of plasticizer, 6 parts of complex fatty acid ester, 2.5 parts of diluent, 0.8 parts of tackifier, 23 parts of thixotropic agent, 16 parts of inorganic filler, 1.5 parts of stabilizer, and 2.5 parts of polyamide and 27.5 parts of PVC resin. In the pre-mixing stage, the complex fatty acid ester and the plasticizer are first stirred at a speed of 210 revolutions per minute until uniform, and then other raw materials are gradually added, the stirring speed is increased to 230 revolutions per minute, and stirring is continued for 17 minutes. In the degassing stage, degassing is carried out at a vacuum degree of -0.09MPa for 9 minutes, and the viscosity is adjusted by adding liquid material for aging, and sampling is carried out to detect viscosity, flow rate, adhesion, and odor. If the inspection fails, return to vacuum and stir again until it is qualified. After the inspection is qualified, a screw pump is used to extract the qualified mixture from the aging kettle, and extrusion and filling are carried out through an extruder.

[0068] Embodiment 3

[0069] This embodiment describes in detail the preparation process of low-odor automotive polyvinyl chloride weld sealant. First, raw materials are prepared according to the following ratio: 25 parts of plasticizer, 7 parts of complex fatty acid ester, 3 parts of diluent, 1 part of tackifier, 24 parts of thixotropic agent, 17 parts of inorganic filler, 2 parts of stabilizer, and 3 parts of polyamide and 28 parts of PVC resin. In the pre-mixing stage, the complex fatty acid ester and the plasticizer are first stirred at a low speed until uniform, and then other raw materials are gradually added, the stirring speed is increased to 200 revolutions per minute, and stirring is continued for 15 minutes. Then, the material is degassed at a vacuum degree of -0.09MPa for 10 minutes, and the viscosity is adjusted by adding liquid material for aging, and sampling is performed to detect viscosity, flow rate, adhesion, and odor. If the inspection fails, it is returned and vacuumed and stirred again until it is qualified. After the inspection is qualified, a screw pump is used to extract the qualified mixture from the aging kettle, and extrusion and filling are performed through an extruder.

[0070] Embodiment 4

[0071] The present embodiment further optimizes the formula and preparation process of low-odor automotive polyvinyl chloride weld sealant, and the raw material ratio is adjusted to: 26 parts of plasticizer, 8 parts of complex fatty acid ester, 3.5 parts of diluent, 1.5 parts of tackifier, 25 parts of thixotropic agent, 18 parts of inorganic filler, 2.5 parts of stabilizer, and 3.5 parts of polyamide and 29 parts of PVC resin. In the premixing stage, the complex fatty acid ester and the plasticizer are first stirred at a speed of 180 revolutions per minute until uniform, and then other raw materials are gradually added, the stirring speed is increased to 220 revolutions per minute, and stirring is continued for 18 minutes. In the degassing stage, degassing is carried out at a vacuum degree of -0.095MPa for 11 minutes, and the viscosity is adjusted by adding liquid material for aging, and sampling is carried out to detect viscosity, flow rate, adhesion, and odor. If the inspection fails, it is returned and vacuumed and stirred again until it is qualified. After the inspection is qualified, a screw pump is used to extract the qualified mixture from the aging kettle, and extrusion and filling are carried out through an extruder.

[0072] Embodiment 5

[0073] The present embodiment aims to prepare a polyvinyl chloride weld sealant for automobiles with lower odor and higher weather resistance. The raw material ratio is as follows: 27 parts of plasticizer, 9 parts of complex fatty acid ester, 4 parts of diluent, 1.8 parts of tackifier, 26 parts of thixotropic agent, 19 parts of inorganic filler, 2.8 parts of stabilizer, as well as 3 parts of polyamide and 27 parts of PVC resin. In the premixing stage, the complex fatty acid ester and the plasticizer are stirred at a speed of 190 revolutions per minute until uniform, and then other raw materials are gradually added, the stirring speed is increased to 210 revolutions per minute, and stirring is continued for 20 minutes. In the degassing stage, degassing is carried out at a vacuum degree of -0.095MPa for 13 minutes, and the viscosity is adjusted by adding liquid material for aging, and sampling is carried out to detect viscosity, flow rate, adhesion, and odor. If the inspection fails, it is returned for vacuum stirring until it passes. After passing the inspection, the qualified mixture is extracted from the aging kettle using a screw pump and extruded and filled by an extruder.

[0074] Embodiment 6

[0075] This embodiment describes in detail the preparation process of low-odor automotive polyvinyl chloride weld sealant. First, the raw materials are prepared according to the following ratio: 28 parts of plasticizer, 10 parts of complex fatty acid ester, 4.5 parts of diluent, 2 parts of viscosity enhancer, 27 parts of thixotropic agent, 20 parts of inorganic filler, 3 parts of stabilizer, as well as 4 parts of polyamide and 30 parts of PVC resin. In the pre-mixing stage, the stirring speed and time remain unchanged. In the degassing stage, the vacuum degree is still -0.095MPa, but the degassing time is extended to 12 minutes. The viscosity is adjusted by adding liquid material for aging, and sampling is performed to detect viscosity, flow rate, adhesion, and odor. If the inspection fails, return to vacuum and stir until it passes. After the inspection passes, a screw pump is used to extract the qualified mixture from the aging kettle and extrude and fill it through an extruder.

[0076] The specific raw material ratio is shown in the following table:

[0077]

[0078] As described in the table above, low-odor automotive polyvinyl chloride weld sealants with different performance characteristics are obtained by controlling the raw material ratio to meet different environmental and application requirements. They can maintain stable performance in various harsh environments and are not prone to cracking, deformation or failure, thereby extending the service life of the sealant and reducing the cost of automobile maintenance and replacement. At the same time, the sealant also has good environmental performance and meets the requirements of sustainable development of the automotive industry.

[0079] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-odor polyvinyl chloride weld sealant for automobiles, characterized in that: The specific steps of this sealant are: S1. Raw material preparation and premixing: S1.1, Raw material ratio: Accurately weigh plasticizer, complex fatty acid ester, diluent, tackifier, thixotropic agent, inorganic filler and stabilizer according to the formula ratio; S1.2, adding compound fatty acid ester: adding compound fatty acid ester and plasticizer into the premixing device, stirring at a low speed to ensure that the two are evenly mixed to form a plasticizer composite liquid; S1.3, raw material premixing: add part of the plasticizer compound liquid, diluent, viscosity enhancer, thixotropic agent, stabilizer in sequence, and continue stirring until the raw materials are evenly mixed; S1.4, adding inorganic filler: gradually increase the stirring speed and add inorganic filler; S1.

5. Add polyvinyl chloride resin: Add polyvinyl chloride resin to the mixture and continue stirring until the resin is completely dispersed. S2. Vacuum degassing: S2.1, Vacuum degassing treatment: Turn on the vacuum pump to perform vacuum degassing treatment on the material to remove bubbles and volatile impurities in the material, and stir the material with negative pressure to make it more uniform; S2.

2. Monitor vacuum degree and degassing time: During the degassing process, the vacuum degree and degassing time should be monitored to ensure the degassing effect; S2.3, Vacuum stirring: Vacuum the mixed materials to remove bubbles and ensure that the materials are mixed evenly. S3. Sampling, testing and adjustment: S3.1, Sampling and testing: adjust the viscosity by adding liquid materials for aging, and conduct sampling and testing, including viscosity, flow rate, adhesion, and odor; S3.2, Adjustment: Adjust the content of the liquid material according to the test results, and perform vacuum stirring again until it reaches the qualified standard; S3.3, qualified material discharge and barrel loading: after passing the inspection, the qualified mixture is extracted from the maturation kettle; S3.

4. Adjustment if unqualified: If the product fails the inspection, return and perform vacuuming and stirring again until it passes. S4, screw pump extrusion canning: S4.

1. Extrusion filling: Use a screw pump to extract the qualified mixture from the aging kettle and extrude and fill it through an extruder.

2. The low-odor polyvinyl chloride weld sealant for vehicles according to claim 1, characterized in that: The raw material ratios in S1.1 are as follows: plasticizer: 20-30 parts, complex fatty acid ester: 5-10 parts, diluent: 1-5 parts, viscosity enhancer: 0.5-2 parts, thixotropic agent: 20-30 parts, inorganic filler: 15-25 parts, stabilizer: 1-3 parts.

3. The low-odor polyvinyl chloride weld sealant for vehicles according to claim 2, characterized in that: The S1.1 also contains 2-5 parts of polyamide to improve the adhesion and elasticity of the sealant, and 20-35 parts of PVC resin to increase the strength and toughness of the sealant.

4. The low-odor polyvinyl chloride weld sealant for vehicles according to claim 1, characterized in that: The composite fatty acid ester mixture added in S1.2 is a mixture of multiple fatty acid esters, has excellent volatility and thermal stability, can significantly reduce the odor of the sealant during high-temperature curing, and is stirred at a low speed of 50 revolutions per minute.

5. The low-odor polyvinyl chloride weld sealant for vehicles according to claim 4, characterized in that: The stirring time during the raw material premixing in step S1.3 is 10-15 minutes, and the stirring speed is gradually increased from 50 revolutions per minute to 150 revolutions per minute.

6. The low-odor polyvinyl chloride weld sealant for vehicles according to claim 5, characterized in that: After the inorganic filler is added to S1.4, the stirring speed is increased to 200 revolutions per minute, and the stirring time is 5-10 minutes.

7. The low-odor polyvinyl chloride weld sealant for vehicles according to claim 1, characterized in that: The S2 performs vacuum degassing treatment on the material by applying an absolute pressure reaching a vacuum degree of -0.09 MPa, and the degassing time is continued for 10 minutes.

8. The low-odor polyvinyl chloride weld sealant for vehicles according to claim 1, characterized in that: When adjusting the liquid content in S3.2, accurate adjustment is performed according to the detection index to ensure that the performance of the sealant meets the requirements. The vacuum stirring time is 5-10 minutes again, and the vacuum degree is maintained at -0.08MPa to -0.1MPa.

9. The low-odor polyvinyl chloride weld sealant for vehicles according to claim 1, characterized in that: The temperature of the polyvinyl chloride weld sealant is controlled below 40 degrees during the entire process.

10. The low-odor polyvinyl chloride weld sealant for vehicles according to claim 1, characterized in that: The polyvinyl chloride weld sealant is added with a complex fatty acid ester mixture, applied to the car body and baked at 160 degrees for more than 30 minutes. The odor problem after high-temperature baking is improved without reducing the mechanical properties of the original polyvinyl chloride weld sealant, and the odor in the car is effectively optimized.

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