Hot-melt sealant for electric vehicle lamp and preparation method of hot-melt sealant

Abstract

The invention discloses a hot-melt sealant for an electric vehicle lamp and a preparation method thereof, and relates to the technical field of hot-melt sealers.The preparation method comprises the following steps that S1, raw materials needed for production of the hot-melt sealant are put into a mixing kettle according to the proportion, and the raw materials are heated and stirred through the mixing kettle so that the raw materials can form viscous glue liquid; s2, further adding a proper amount of high-temperature-resistant defoaming agent into the mixing kettle, and stirring at a constant temperature; s3, pouring the adhesive viscous liquid into a mold at a constant speed, carrying out casting molding, and curing the poured silicone sealant at room temperature; s4, the solid colloid is cut into strips, so that the solid colloid can be conveniently packaged and transported with packaging bags; according to the present invention, with the setting of the defoaming agent, the appropriate amount of the defoaming agent is added on the basis of the raw materials required by the original traditional hot-melt sealant production so as to change the foam structure in the hot-melt sealant and make the hot-melt sealant unstable, such that the foam is rapidly eliminated, and the adhesion and the stability of the hot-melt sealant are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of hot melt sealants, and in particular to a hot melt sealant for an electric vehicle lamp and a preparation method thereof. Background Art

[0002] Hot melt sealant is a plastic adhesive. Its physical state changes with temperature within a certain temperature range, but its chemical properties remain unchanged. It is non-toxic and tasteless, and is an environmentally friendly chemical product. It is solid, easy to package, transport, store, solvent-free, pollution-free, and non-toxic. It is also popular because of its simple production process, high added value, high bonding strength, and fast speed.

[0003] In the prior art, when producing hot melt sealants, a mixing kettle is often used to heat and stir the raw materials required for the production of hot melt sealants so that the raw materials are mixed and melted;

[0004] However, from the perspective of actual stirring, the melted raw material viscous will easily produce a large number of bubbles under high-speed stirring. The presence of bubbles will easily reduce the production quality of the hot melt sealant, so that a long time will be required for static de-bubble treatment in the later stage. Summary of the invention

[0005] In order to solve the above technical problems, a hot melt sealant for electric vehicle lights and a preparation method thereof are provided, which solves the problem in the prior art that the melted raw material mucus is prone to produce a large number of bubbles under high-speed stirring, and the presence of bubbles easily reduces the production quality of the hot melt sealant, so that a long time of static de-bubble treatment is required in the later stage.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: a hot melt sealant for electric vehicle lights and a preparation method thereof, comprising the following steps:

[0007] S1: Putting raw materials required for hot melt sealant production into a mixing kettle in proportion, heating and stirring the raw materials in the mixing kettle to form a viscous liquid, wherein the raw materials include butyl rubber, polyisobutylene, carbon black, EPDM rubber, calcium carbonate, hydrogenated rosin resin, vinyl carboxylate, silane coupling agent and plasticizer;

[0008] S2: further adding an appropriate amount of high temperature resistant defoaming agent into the mixing kettle and stirring at a constant temperature, using the high temperature resistant defoaming agent to reduce bubbles generated when the viscous liquid is stirred and mixed, thereby improving the quality of the generated viscous liquid;

[0009] S3: pour the adhesive viscous liquid into the mold at a uniform speed and cast it into shape, and then place the cast silicone sealant at room temperature to cure to obtain a solid colloid. Generally, at 25°C and a relative humidity of 50%, the surface curing time of the adhesive viscous liquid is 25 minutes, and the complete curing time is 25 hours;

[0010] S4: Cut the solid colloid into strips to facilitate packaging and transportation in packaging bags.

[0011] Preferably, the percentage content of each component of the hot melt sealant is: 55 parts of butyl rubber, 45 parts of polyisobutylene, 25 parts of carbon black, 8 parts of EPDM rubber, 25 parts of calcium carbonate, 8 parts of hydrogenated rosin resin, 8 parts of vinyl carboxylate, 8 parts of defoaming agent, 18 parts of silane coupling agent and 18 parts of plasticizer.

[0012] Preferably, a mixing kettle is proposed, comprising a heating cylinder, a closing cover arranged on the heating cylinder and a heating sleeve sleeved on the outside of the heating cylinder, a motor is installed at the bottom of the heating cylinder, the output end of the motor penetrates into the heating cylinder and is fixed with a stirring rod, a plurality of stirring blades are fixed around the rod body of the stirring rod, and the characteristic is that a discharge port is arranged at the top of the closing cover, a funnel-shaped hopper is arranged outside the discharge port, the hopper is fixedly connected to the top surface of the closing cover through a bracket, and a material mixing mechanism cooperating with the hopper is arranged in the discharge port;

[0013] The material mixing mechanism includes an L-shaped material guide pipe that cooperates with the stirring rod, and the material guide pipe is composed of a vertical pipe and an inclined pipe. The vertical pipe is rotatably arranged at the discharge port, and an extension slide is slidably arranged on the tube wall of the inclined tube. A discharge port is opened at the bottom of the extension slide, and an intermittent pulling component is arranged on the tube wall of the vertical pipe. The discharge end of the hopper is inserted into the vertical pipe, and a clamping spring is also sleeved on the outer wall of the inclined tube, one end of the clamping spring is fixedly connected to the extension slide, and the other end of the clamping spring is fixed with a circular connecting ring, and the connecting ring is tightly sleeved on the outer wall of the inclined tube.

[0014] Preferably, the intermittent pulling part includes two connecting plates symmetrically fixed on the outer wall of the vertical tube, a movable rotating rod rotatably arranged between the two connecting plates, and a movable rotating cylinder tightly sleeved on the rod body of the movable rotating rod, a fixing plate is fixed on the outer wall of the extension slide cylinder, and a pull rope is fixed between the roller body of the movable rotating cylinder and the fixing plate.

[0015] Preferably, the intermittent pulling component also includes a fixing ring arranged on the outside of the guide tube and fixedly connected to the inner wall of the top end of the closing cover, and an arc-shaped tooth plate fixed on the inner wall of the fixing ring, a bearing plate is fixed on the outer wall of the vertical tube, a worm is rotatably connected to the inner side of the bearing plate, the shaft of the movable rotating rod is tightly sleeved with a turbine meshing with the worm, and a transmission gear meshing with the arc-shaped tooth plate is fixed to the top end of the worm.

[0016] Preferably, a connecting rod is vertically fixed to the bottom of the material guide tube, an insert block is fixed to the bottom end of the connecting rod, and a slot matched with the insert block is formed at the top end of the stirring rod.

[0017] Preferably, a plurality of spikes are fixed at equal intervals on both sides of the stirring blade.

[0018] Preferably, the stirring time in S1 is 40-60 min, and the heating temperature is 120-150°C.

[0019] Preferably, the stirring time in S2 is 30-45 min, and the heating temperature is 130-145°C.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] (1) By setting up the defoaming agent, an appropriate amount of defoaming agent is added to the raw materials required for the production of traditional hot melt sealants, thereby changing the foam structure in the hot melt sealant and making it unstable, thereby quickly eliminating the foam, effectively improving the adhesion and stability of the hot melt sealant, and enhancing its service life in complex environments.

[0022] (2) Through the setting of the material mixing mechanism, when the defoaming agent is put into the hopper, the defoaming agent can enter the extension slide through the material guide pipe and finally discharge to the inner side of the heating cylinder from the material outlet. In addition, when the motor is turned on so that the stirring blade and the stirring rod fully mix the raw materials as a whole, the material guide pipe in the material mixing mechanism rotates synchronously with the stirring rod, and the extension slide slides back and forth along the outer wall of the inclined tube of the material guide pipe under the action of the intermittent pulling component when the material guide pipe rotates. The extension slide that rotates circumferentially and slides back and forth can effectively deliver the high-temperature defoaming agent to different directions, thereby expanding the dispersion degree of the high-temperature defoaming agent, improving the uniform distribution degree of the high-temperature defoaming agent in the viscous liquid, and ensuring the defoaming quality of the viscous liquid.

[0023] (3) By setting the spikes, when the stirring blade rotates to stir the raw materials, the spikes can contact the bubbles in the raw materials and puncture and eliminate the bubbles, thereby improving the bubble removal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the bottom structure of the closure cover of the present invention;

[0027] Figure 4 For the present invention Figure 3 Schematic diagram of the structure at point A in the middle.

[0028] The numbers in the figure are:

[0029] 1. Heating cylinder; 2. Heating sleeve; 3. Closing cover; 4. Mounting plate; 5. Handle; 6. Motor; 7. Stirring rod; 8. Stirring blade; 9. Hopper; 10. Material guide tube; 11. Extension slide; 12. Discharge port; 13. Connecting piece; 14. Movable rotating rod; 15. Movable rotating cylinder; 16. Fixed piece; 17. Pull rope; 18. Connecting ring; 19. Compression spring; 20. Worm; 21. Load-bearing piece; 22. Fixed ring; 23. Arc tooth plate; 24. Transmission gear; 25. Connecting rod; 26. Insert block; 27. Spike. DETAILED DESCRIPTION

[0030] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0031] Example 1

[0032] A method for preparing hot melt sealant for electric vehicle lamps, comprising the following steps:

[0033] S1: Putting raw materials required for hot melt sealant production into a mixing kettle in proportion, heating and stirring the raw materials in the mixing kettle to form a viscous liquid, wherein the raw materials include butyl rubber, polyisobutylene, carbon black, EPDM rubber, calcium carbonate, hydrogenated rosin resin, vinyl carboxylate, silane coupling agent and plasticizer;

[0034] S2: further adding an appropriate amount of high temperature resistant defoaming agent into the mixing kettle and stirring at a constant temperature, using the high temperature resistant defoaming agent to reduce bubbles generated when the viscous liquid is stirred and mixed, thereby improving the quality of the generated viscous liquid;

[0035] S3: pour the adhesive viscous liquid into the mold at a uniform speed and cast it into shape, and then place the cast silicone sealant at room temperature to cure to obtain a solid colloid. Generally, at 25°C and a relative humidity of 50%, the surface curing time of the adhesive viscous liquid is 25 minutes, and the complete curing time is 25 hours;

[0036] S4: Cut the solid colloid into strips to facilitate packaging and transportation in packaging bags.

[0037] The hot melt sealant prepared by the hot melt sealant preparation method has the following components in percentage: 55 parts of butyl rubber, 45 parts of polyisobutylene, 25 parts of carbon black, 8 parts of EPDM rubber, 25 parts of calcium carbonate, 8 parts of hydrogenated rosin resin, 8 parts of vinyl carboxylate, 8 parts of defoaming agent, 18 parts of silane coupling agent and 18 parts of plasticizer.

[0038] As can be seen from the above, this scheme, through the setting of high-temperature resistant defoaming agent, adds an appropriate amount of high-temperature resistant defoaming agent on the basis of the raw materials required for the original traditional hot-melt sealant production, so as to change the foam structure in the hot-melt sealant and make it unstable, thereby quickly eliminating the foam, effectively improving the adhesion and stability of the hot-melt sealant, and enhancing its service life in complex environments.

[0039] Example 2

[0040] like Figure 1-4 As shown, on the basis of Example 1, the present invention provides a technical solution: Preferably, a mixing kettle is proposed, comprising a heating cylinder 1, a closing cover 3 arranged on the heating cylinder 1, and a heating sleeve 2 sleeved on the outside of the heating cylinder 1, a motor 6 is installed at the bottom of the heating cylinder 1, the output end of the motor 6 penetrates into the heating cylinder 1 and is fixed with a stirring rod 7, a plurality of stirring blades 8 are fixed around the rod body of the stirring rod 7, and a liquid inlet (not shown in the figure) and a liquid outlet (not shown in the figure) are arranged on the heating sleeve 2;

[0041] The outer walls of the heating cylinder 1 and the closing cover 3 are both tightly sleeved with mounting plates 4, and the two mounting plates 4 are detachably connected by bolts;

[0042] When the hot melt adhesive is to be processed, the bolts between the two mounting plates 4 are loosened in advance, and the heating cylinder 1 and the closing cover 3 are separated so that the raw materials such as butyl rubber, polyisobutylene, carbon black, EPDM rubber, calcium carbonate, hydrogenated rosin resin, vinyl carboxylate, silane coupling agent and plasticizer required for the production of hot melt adhesive can be manually added into the heating cylinder 1;

[0043] After the raw materials are added, the closing cover 3 is placed on the top of the heating cylinder 1, and the two mounting plates 4 are locked with bolts to ensure the sealing inside the heating cylinder 1;

[0044] Then, the motor 6 is turned on, and the output shaft of the motor 6 drives the stirring rod 7 and the stirring blade 8 to rotate as a whole, thereby effectively stirring the raw materials. The heat transfer oil is circulated into the heating sleeve 2 through the liquid inlet and outlet on the heating sleeve 2, and the heating cylinder 1 is heated by the heat transfer oil, so that the raw materials inside the heating sleeve 1 are heated and melted to form a viscous liquid.

[0045] Further, refer to Figure 2 As shown, it is worth noting that a discharge port is provided at the top of the closing cover 3, and a funnel-shaped hopper 9 is provided outside the discharge port, and the hopper 9 is fixedly connected to the top surface of the closing cover 3 through a bracket;

[0046] By setting the hopper 9 and the discharge port, when the raw materials in the heating cylinder 1 are heated and stirred to a certain degree, the high-temperature resistant defoaming agent is then added from the hopper 9 to the discharge port, so that the defoaming agent is evenly stirred with the viscous liquid in the heating cylinder 1, thereby utilizing the high-temperature defoaming agent to reduce the bubbles generated when the viscous liquid is stirred and mixed, thereby improving the generated quality of the viscous liquid.

[0047] Further, refer to Figure 2-3 As shown, it is worth noting that a material leveling mechanism cooperating with the hopper 9 is provided in the discharge port;

[0048] The material mixing mechanism includes an L-shaped material guide pipe 10 that cooperates with the stirring rod 7. The material guide pipe 10 is composed of a vertical pipe and an inclined pipe. The vertical pipe is rotatably arranged at the discharge port. An extension slide 11 is slidably arranged on the wall of the inclined pipe. A discharge port 12 is opened at the bottom of the extension slide 11. An intermittent pulling component is arranged on the wall of the vertical pipe. The discharge end of the hopper 9 penetrates into the vertical pipe.

[0049] By setting the material mixing mechanism, after the defoaming agent is put into the hopper 9, the defoaming agent can enter the extension slide 11 through the guide pipe 10, and finally discharge to the inner side of the heating cylinder 1 from the discharge port 12. In addition, the motor 6 is turned on to make the stirring blade 8 and the stirring rod 7 fully stir the raw materials as a whole. The guide pipe 10 in the material mixing mechanism rotates synchronously with the stirring rod 7, and the extension slide 11 is acted on by the intermittent pulling component when the guide pipe 10 rotates, and the extension slide 11 slides back and forth along the outer wall of the inclined tube of the guide pipe 10 by the intermittent pulling component. The extension slide 11 that rotates circumferentially and slides back and forth can effectively deliver the high-temperature defoaming agent to different directions, thereby expanding the dispersion degree of the high-temperature defoaming agent, improving the uniform distribution degree of the high-temperature defoaming agent in the viscous liquid, and ensuring the defoaming quality of the viscous liquid.

[0050] Further, refer to Figure 4 As shown, it is worth noting that the intermittent pulling part includes two connecting pieces 13 symmetrically fixed on the outer wall of the vertical tube, a movable rotating rod 14 rotatably arranged between the two connecting pieces 13, and a movable rotating cylinder 15 tightly sleeved on the rod body of the movable rotating rod 14, a fixing piece 16 is fixed on the outer wall of the extension slide 11, and a pull rope 17 is fixed between the roller body of the movable rotating cylinder 15 and the fixing piece 16;

[0051] The intermittent pulling component also includes a fixing ring 22 which is arranged outside the guide tube 10 and fixedly connected to the inner wall of the top end of the closing cover 3, and an arc-shaped tooth plate 23 fixed to the inner wall of the fixing ring 22. A bearing sheet 21 is fixed to the outer wall of the vertical tube, and a worm 20 is rotatably connected to the inner side of the bearing sheet 21. The rod body of the movable rotating rod 14 is tightly sleeved with a turbine meshing with the worm 20, and a transmission gear 24 meshing with the arc-shaped tooth plate 23 is fixed to the top end of the worm 20.

[0052] A compression spring 19 is also sleeved on the outer wall of the inclined tube, one end of the compression spring 19 is fixedly connected to the extension slide 11, and the other end of the compression spring 19 is fixed with a circular connecting ring 18, which is tightly sleeved on the outer wall of the inclined tube;

[0053] During the process of the guide tube 10 rotating along with the stirring rod 7, the transmission gear 24 can synchronously rotate the guide tube 10 on the inner side of the fixed ring 22 and intermittently mesh with the arc-shaped tooth plate 23. During this period, when the transmission gear 24 meshes with the arc-shaped tooth plate 23, the worm 20 is forced to rotate and mesh with the turbine, so that the movable rotating rod 14 carries the movable rotating cylinder 15 to rotate and wind the pull rope 17, thereby pulling the fixed plate 16 and the extension slide 11 as a whole, so that the extension slide 11 slides up along the outer wall of the inclined tube and compresses the clamping spring 19 to deform. On the contrary, when the transmission gear 24 moves to no longer mesh with the arc-shaped tooth plate 23, the extension slide 11 can quickly return to its original position and slide down under the elastic force of the clamping spring 19, thereby realizing the reciprocating sliding of the extension slide 11.

[0054] Further, refer to Figure 2 As shown, it is worth noting that a connecting rod 25 is vertically fixed to the bottom of the guide tube 10, an insert block 26 is fixed to the bottom end of the connecting rod 25, and a slot matching the insert block 26 is provided at the top end of the stirring rod 7;

[0055] By setting the insert block 26 and the slot, after the raw materials are added to the inner side of the heating cylinder 1, when the closing cover 3 is installed on the top of the heating cylinder 1, the insert block 26 can be aligned and inserted into the slot, so as to realize the fixed connection relationship between the stirring rod 7 and the connecting rod 25, so that when the motor 6 is turned on, the stirring rod 7 can use the synchronous connecting rod 25 to drive the guide tube 10 and the extension slide 11 to rotate as a whole.

[0056] Further, refer to Figure 2 As shown, it is worth noting that a plurality of spikes 27 are fixed at equal distances on both sides of the stirring blade 8;

[0057] By setting the spikes 27, when the stirring blade 8 rotates to stir the raw materials, the spikes 27 can contact the bubbles in the raw materials and puncture and eliminate the bubbles, thereby improving the bubble removal effect.

[0058] Further, refer to Figure 2 As shown, it is worth noting that two handles 5 are symmetrically fixed on the top surface of the closing cover 3;

[0059] The handle 5 can be provided to facilitate manual handling of the closing cover 3 .

[0060] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preparing hot melt sealant for electric vehicle lights, It is characterized in that The steps include: S1: Putting raw materials required for hot melt sealant production into a mixing kettle in proportion, heating and stirring the raw materials in the mixing kettle to form a viscous liquid, wherein the raw materials include butyl rubber, polyisobutylene, carbon black, EPDM rubber, calcium carbonate, hydrogenated rosin resin, vinyl carboxylate, silane coupling agent and plasticizer; S2: further adding an appropriate amount of high temperature resistant defoaming agent into the mixing kettle and stirring at a constant temperature, using the high temperature resistant defoaming agent to reduce bubbles generated when the viscous liquid is stirred and mixed, thereby improving the quality of the generated viscous liquid; S3: pour the adhesive viscous liquid into the mold at a uniform speed and cast it into shape, and then place the cast silicone sealant at room temperature to cure to obtain a solid colloid. Generally, at 25°C and a relative humidity of 50%, the surface curing time of the adhesive viscous liquid is 25 minutes, and the complete curing time is 25 hours; S4: Cut the solid colloid into strips to facilitate packaging and transportation in packaging bags.

2. The hot melt sealant prepared by the method for preparing hot melt sealant for electric vehicle lamps according to claim 1, Features: The percentage content of each component of the hot melt sealant is: 55 parts of butyl rubber, 45 parts of polyisobutylene, 25 parts of carbon black, 8 parts of EPDM rubber, 25 parts of calcium carbonate, 8 parts of hydrogenated rosin resin, 8 parts of vinyl carboxylate, 8 parts of defoaming agent, 18 parts of silane coupling agent and 18 parts of plasticizer.

3. According to the method for preparing hot melt sealant for electric vehicle lamps as described in claim 1, a mixing kettle is provided, comprising a heating cylinder (1), a closing cover (3) arranged on the heating cylinder (1), and a heating sleeve (2) sleeved on the outside of the heating cylinder (1), a motor (6) is installed at the bottom of the heating cylinder (1), the output end of the motor (6) penetrates into the heating cylinder (1) and is fixed with a stirring rod (7), and a plurality of stirring blades (8) are fixed around the rod body of the stirring rod (7). It is characterized in that The top of the closure cover (3) is provided with a discharge port, a funnel-shaped hopper (9) is provided outside the discharge port, the hopper (9) is fixedly connected to the top surface of the closure cover (3) through a bracket, and a material mixing mechanism matched with the hopper (9) is provided inside the discharge port; The material mixing mechanism comprises a material guide pipe (10) which is L-shaped and cooperates with the stirring rod (7), the material guide pipe (10) is composed of a vertical pipe and an inclined pipe, the vertical pipe is rotatably arranged at the discharge port, an extension slide (11) is slidably arranged on the pipe wall of the inclined pipe, a discharge port (12) is opened at the bottom of the extension slide (11), an intermittent pulling component is arranged on the pipe wall of the vertical pipe, the discharge end of the hopper (9) is inserted into the vertical pipe, and a clamping spring (19) is also sleeved on the outer wall of the inclined pipe, one end of the clamping spring (19) is fixedly connected to the extension slide (11), and the other end of the clamping spring (19) is fixedly connected to a circular ring-shaped connecting ring (18), and the connecting ring (18) is tightly sleeved on the outer wall of the inclined pipe.

4. A hot melt sealant for electric vehicle lights and a preparation method thereof according to claim 3, It is characterized in that The intermittent pulling portion comprises two connecting plates (13) symmetrically fixed on the outer wall of the vertical tube, a movable rotating rod (14) rotatably arranged between the two connecting plates (13), and a movable rotating cylinder (15) tightly sleeved on the rod body of the movable rotating rod (14); a fixing plate (16) is fixed on the outer wall of the extension slide cylinder (11), and a pulling rope (17) is fixed between the roller body of the movable rotating cylinder (15) and the fixing plate (16).

5. A hot melt sealant for electric vehicle lights and a preparation method thereof according to claim 4, It is characterized in that The intermittent pulling component also includes a fixing ring (22) arranged outside the guide tube (10) and fixedly connected to the inner wall of the top end of the closing cover (3), and an arc-shaped tooth plate (23) fixed on the inner wall of the fixing ring (22); a bearing plate (21) is fixed on the outer wall of the vertical tube, and a worm (20) is rotatably connected to the inner side of the bearing plate (21); the shaft of the movable rotating rod (14) is tightly sleeved with a turbine meshing with the worm (20); and a transmission gear (24) meshing with the arc-shaped tooth plate (23) is fixed to the top end of the worm (20).

6. A hot melt sealant for electric vehicle lights and a preparation method thereof according to claim 3, Features: A connecting rod (25) is vertically fixed at the bottom of the material guide tube (10), an insert block (26) is fixed at the bottom end of the connecting rod (25), and a slot matching the insert block (26) is provided at the top end of the stirring rod (7).

7. A hot melt sealant for electric vehicle lights and a preparation method thereof according to claim 3, Features: A plurality of spikes (27) are fixed at equal intervals on both sides of the stirring blade (8).

8. The hot melt sealant for electric vehicle lights and the preparation method thereof according to claim 1, Features: The stirring time described in S1 is 40-60 minutes, and the heating temperature is 120-150°C.

9. The hot melt sealant for electric vehicle lights and the preparation method thereof according to claim 1, Features: The stirring time described in S2 is 30-45 minutes, and the heating temperature is 130-145°C.

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