Method for vulcanizing and demolding a v-belt

Abstract

The application discloses a kind of flat vulcanization process of V-belt, and special treatment is carried out to flat mould and rubber plate of flat vulcanization machine.For flat mould part, the process of Teflon spraying is used for treatment, and the surface of treated flat mould is bright and black, and does not produce any adhesion with rubber.High-strength Teflon cloth is used to paste rubber plate, so that the canvas is not easy to crack in use, and does not produce any adhesion with rubber.The application can completely eliminate the use of release oil in the vulcanization process of V-belt, improve the working environment, improve the vulcanization efficiency, reduce the harm of release oil to human body, and ensure the quality of V-belt.

Description

Technical Field

[0001] This invention relates to the field of V-belt manufacturing processes, specifically to a method for vulcanizing and demolding V-belts, which mainly eliminates the use of demolding oil during the production process. Background Technology

[0002] Currently, the method used for demolding rubber V-belts during vulcanization involves spraying release oil onto a flat mold, the surface of the raw belt, and the rubber sheet. Release oil is generally a silicone-based substance, and its use presents the following problems: 1. Impact on the production environment: Before vulcanization, a certain amount of release oil needs to be sprayed onto the V-belt. During the spraying process, some release oil inevitably spills onto the vulcanizing machine, the ground, and the workbench, easily leading to a dirty and messy production environment. 2. Impact on human health: Different people have different sensitivities to release oil, and its use may harm the skin of some workers. 3. Impact on belt quality: Excessive spraying of release oil can seep into the V-belt's fabric layer, causing the fabric layer to separate from the rubber material after vulcanization, resulting in the V-belt being unusable. Summary of the Invention

[0003] To address the shortcomings of the aforementioned background technology, this invention provides a special demolding process that eliminates the need for spraying release oil during vulcanization, improves the vulcanization working environment, reduces the harm of the vulcanization process to the human body, increases production efficiency, and ensures product quality.

[0004] The objective of this invention is achieved as follows:

[0005] A method for vulcanizing and demolding a V-belt plate includes the following steps:

[0006] The steps for applying Teflon coating to a flat mold are as follows:

[0007] (1) Cleaning: Clean the surface of the flat mold with a towel to remove oil and impurities;

[0008] (2) Polishing: The flat mold is heated and polished in a polishing machine;

[0009] (3) Spraying primer: Heat the polished flat mold to a certain temperature and let it cool naturally, then spray Teflon primer; the surface should be evenly coated.

[0010] (4) Heating: Heat the flat mold after applying the primer;

[0011] (5) Spraying topcoat: Cool the flat mold and spray Teflon topcoat; the topcoat is sprayed evenly on the surface of the flat mold, making it black and glossy;

[0012] (6) Heating and cooling: Heat the flat mold after coating with topcoat, and then cool it to room temperature;

[0013] (7) Installation: Install the cooled flat mold into the flat vulcanizing machine;

[0014] The steps for fabricating the adhesive sheet and applying Teflon high-temperature cloth are as follows:

[0015] (1) Ingredients: Prepare adhesive for the rubber sheet and Teflon high-temperature cloth. The weight parts of each component in the adhesive for the rubber sheet are as follows: EPDM rubber: 90-110, zinc methacrylate: 4-6, zinc oxide: 4-6, antioxidant RD: 0.8-1.2, anti-scorching agent: 0.7-1, defoamer: 2.5-2.8, carbon black N220: 18-22, carbon black N85: 18-22, calcium carbonate: 18-22, DCP: 5-7; The Teflon high-temperature cloth is coated with adhesive on the back and directly attached to the surface of the rubber sheet. The thickness is 0.3-0.4 mm, the radial and weft tensile strength is greater than 2000 N / 5 cm, and the temperature resistance is -70℃ to 260℃.

[0016] (2) Mixing: Add each raw material in the rubber sheet to the internal mixer for internal mixing. When mixing, first add EPDM rubber, then add zinc methacrylate, zinc oxide, antioxidant RD, anti-scorching agent, defoamer, carbon black N220, carbon black N85, and calcium carbonate. Discharge the rubber and cool it to room temperature. Add a section of material to the internal mixer, add DCP, discharge the rubber and cool it to room temperature.

[0017] (3) Calendering: The mixed rubber is calendered in a calender to form a rubber sheet with a thickness of 0.5-0.8cm;

[0018] (4) Cutting: Cut the rubber sheet according to the size of the vulcanizing surface of the flat vulcanizing machine and apply Chemlock adhesive evenly to one side;

[0019] (5) Rubber sheet vulcanization: Place the rubber sheet on the flat vulcanizing machine, brush open one side of the Mlock and bond it to the flat vulcanizing machine, place a flat iron plate between the flat mold surface and the rubber sheet, and vulcanize the rubber sheet.

[0020] (6) Apply Teflon high-temperature cloth: Cut Teflon high-temperature cloth according to the size of the rubber sheet, and apply the adhesive backing to the rubber sheet; press it with an iron plate and co-vulcanize with the rubber sheet. Vulcanization conditions: pressure 2MPa, time 1 minute, temperature 150℃; remove the iron plate after vulcanization, and the V-belt vulcanization can be carried out.

[0021] In step (2) of spraying Teflon coating onto the flat mold, the temperature is raised to 90°C.

[0022] In step (3) of spraying Teflon coating onto the flat mold, the polished flat mold is heated to 180°C and then naturally cooled to 60°C; the amount of primer sprayed onto the surface of the flat mold is approximately 0.5 kg / m2-0.7 kg / m2.

[0023] In step (4) of spraying Teflon coating onto the flat mold, the flat mold is heated to 360°C and maintained for 1 hour.

[0024] In step (5) of spraying Teflon coating onto the flat mold, the amount of topcoat sprayed onto the surface of the flat mold is approximately 0.5 kg / m2-0.7 kg / m2.

[0025] In step (6) of spraying Teflon coating onto the flat mold, the flat mold is heated to 450°C and maintained for 1 hour.

[0026] In step (1) of making the adhesive sheet and applying Teflon high-temperature cloth, the weight parts of each component in the adhesive sheet are as follows: EPDM: 100, zinc methacrylate: 5, zinc oxide: 5, antioxidant RD: 1, anti-scorching agent: 0.9, defoamer: 2.6, carbon black N220: 20, carbon black N85: 20, calcium carbonate: 20, DCP: 6.

[0027] In step (2) of the preparation of the rubber sheet and the application of Teflon high-temperature cloth, EPDM rubber is first added and mixed for 50-60 seconds at 100°C and 36 rpm. Then zinc methacrylate, zinc oxide, antioxidant RD, anti-scorching agent, defoamer, carbon black N220, carbon black N85, and calcium carbonate are added and mixed for 100-110 seconds at 160°C and 36 rpm. The rubber is then discharged and cooled to room temperature. A section of material is added to the internal mixer and mixed for 20-30 seconds. DCP is added and mixed for 30-40 seconds at 85°C and 25 rpm. The rubber is then discharged and cooled to room temperature.

[0028] In step (4) of making the adhesive sheet and applying Teflon high-temperature cloth, the amount of adhesive used is 0.1kg / m2-0.2kg / m2.

[0029] In step (5) of making the rubber sheet and applying Teflon high-temperature cloth, the vulcanization conditions are: pressure 5MPa, time 90 minutes, and temperature 150℃; in step (6) of making the rubber sheet and applying Teflon high-temperature cloth, the vulcanization conditions are: pressure 2MPa, time 1 minute, and temperature 150℃.

[0030] This invention involves spraying Teflon coating onto a flat mold and then attaching a Teflon high-temperature cloth to a rubber sheet. After the Teflon coating is applied to the surfaces of the flat mold and the rubber sheet, the V-belt no longer sticks to the flat mold and the rubber sheet during vulcanization and mold opening, greatly improving demolding efficiency.

[0031] The Teflon-coated flat mold of this invention can be used for more than 3 months. After the Teflon on the surface of the flat mold is used up, it needs to be cleaned and recoated. The Teflon high-temperature cloth can be used for more than 20 days. After cracking, it needs to be re-attached. The re-attaching process is described in step 6 of applying the Teflon high-temperature cloth.

[0032] The most prominent feature of this invention compared to the prior art is that it eliminates the need to spray release oil before vulcanization of the V-belt, thereby improving the working environment, increasing vulcanization efficiency, and ensuring the quality of the V-belt. Attached Figure Description

[0033] Figure 1 Schematic diagram of the coating process for the flat mold of this invention;

[0034] Figure 2 A schematic diagram of the adhesive sheet and the Teflon-coated high-temperature cloth of this invention. Detailed Implementation

[0035] The steps for applying Teflon coating to a flat mold are as follows:

[0036] (1) Cleaning: Clean the surface of the flat mold with a towel to remove oil and impurities.

[0037] (2) Polishing: Heat the flat mold to 90°C and polish it in a polishing machine.

[0038] (3) Apply primer: Heat the polished flat mold to 180°C and let it cool naturally to 60°C, then apply Teflon primer. The amount of primer applied to the surface of the flat mold is about 0.5 kg / m2-0.7 kg / m2, and the surface is evenly coated.

[0039] (4) Heating: Heat the flat mold coated with primer to 360°C and keep it for 1 hour.

[0040] (5) Topcoat spraying: Cool the flat mold to 100℃ and spray Teflon topcoat. The amount of topcoat sprayed on the surface of the flat mold is about 0.5kg / m2-0.7kg / m2. The surface is evenly sprayed and has a glossy black color.

[0041] (6) Heating and cooling: Heat the flat mold coated with topcoat to 450°C and keep it for 1 hour, then cool it to room temperature.

[0042] (7) Installation: Install the cooled flat mold into the flat vulcanizing machine.

[0043] The steps for fabricating the adhesive sheet and applying Teflon high-temperature cloth are as follows:

[0044] (1) Ingredients: Prepare adhesive for the glue sheet and Teflon high-temperature cloth.

[0045] The weight proportions of each component in the adhesive sheet are as follows: EPDM rubber: 100, zinc methacrylate: 5, zinc oxide: 5, antioxidant RD: 1, anti-scorching agent: 0.9, defoamer: 2.6, carbon black N220: 20, carbon black N85: 20, calcium carbonate: 20, DCP: 6. The Teflon high-temperature cloth is backed with adhesive and can be directly applied to the surface of the adhesive sheet. Its thickness is 0.3-0.4 mm, its radial and weft tensile strength is greater than 2000 N / 5 cm, and its temperature resistance is -70℃ to 260℃.

[0046] (2) Mixing: Add all the raw materials for the rubber sheet to a mixer and mix them. First, add EPDM rubber and mix for 50-60 seconds at 100°C and 36 rpm. Then add zinc methacrylate, zinc oxide, antioxidant RD, anti-scorching agent, defoamer, carbon black N220, carbon black N85, and calcium carbonate. Mix for 100-110 seconds at 160°C and 36 rpm. Discharge and cool to room temperature. Add a section of material to the mixer and mix for 20-30 seconds. Add DCP and mix for 30-40 seconds at 85°C and 25 rpm. Discharge and cool to room temperature.

[0047] (3) Calendering: The mixed rubber is calendered in a calender to form a sheet with a thickness of 0.5-0.8cm.

[0048] (4) Cutting: Cut the film according to the size of the vulcanizing surface of the flat vulcanizing machine and apply Chemlock adhesive evenly to one side. The amount of adhesive used is 0.1kg / m2-0.2kg / m2.

[0049] (5) Rubber sheet vulcanization: Place the rubber sheet on a flat vulcanizing machine, brush open one side of the mold and bond it to the flat vulcanizing machine. Place a flat iron plate between the mold surface and the rubber sheet to vulcanize the rubber sheet. Vulcanization conditions: pressure 5MPa, time 90 minutes, temperature 150℃.

[0050] (6) Apply Teflon high-temperature cloth: Cut the Teflon high-temperature cloth according to the size of the rubber sheet and apply the adhesive side to the rubber sheet. Then press it with an iron plate and co-vulcanize it with the rubber sheet. Vulcanization conditions: pressure 2MPa, time 1 minute, temperature 150℃. After vulcanization, remove the iron plate and the V-belt vulcanization can be carried out.

[0051] In this embodiment, the flat mold portion is treated with a Teflon coating process. The treated surface of the flat mold is glossy black and does not adhere to the rubber. High-strength Teflon high-temperature cloth is used to bond the rubber sheet, making the canvas less prone to cracking during use and preventing any adhesion to the rubber. This invention completely eliminates the need for release oil during the vulcanization of V-belts, improving the working environment, increasing vulcanization efficiency, reducing the harm of release oil to the human body, and ensuring the quality of the V-belts.

[0052] The above content describes the technical principles, beneficial effects, and features of the present invention. It should be noted that the above description is only a preferred embodiment of the present invention, but is not limited to the above embodiments. For those skilled in the art, some improvements and optimizations can be made without departing from the content of the present invention, and these should be considered to fall within the protection scope of the present invention.

Claims

1. A method for vulcanizing and demolding a V-belt flat plate, characterized in that, Includes the following steps: The steps for applying Teflon coating to a flat mold are as follows: (1) Cleaning: Clean the surface of the flat mold with a towel to remove oil and impurities; (2) Polishing: The flat mold is heated and polished in a polishing machine; (3) Spraying primer: Heat the polished flat mold to a certain temperature and let it cool naturally, then spray Teflon primer; the surface should be evenly coated. (4) Heating: Heat the flat mold after applying the primer; (5) Spraying topcoat: Cool the flat mold and spray Teflon topcoat; the topcoat is sprayed evenly on the surface of the flat mold, making it black and glossy; (6) Heating and cooling: Heat the flat mold after coating with topcoat, and then cool it to room temperature; (7) Installation: Install the cooled flat mold into the flat vulcanizing machine; The steps for fabricating the adhesive sheet and applying Teflon high-temperature cloth are as follows: (1) Ingredients: Prepare adhesive for the rubber sheet and Teflon high-temperature cloth. The weight parts of each component in the adhesive for the rubber sheet are as follows: EPDM rubber: 90-110, zinc methacrylate: 4-6, zinc oxide: 4-6, antioxidant RD: 0.8-1.2, anti-scorching agent: 0.7-1, defoamer: 2.5-2.8, carbon black N220: 18-22, carbon black N85: 18-22, calcium carbonate: 18-22, DCP: 5-7; The Teflon high-temperature cloth is coated with adhesive on the back and directly attached to the surface of the rubber sheet. The thickness is 0.3-0.4 mm, the radial and weft tensile strength is greater than 2000 N / 5 cm, and the temperature resistance is -70℃ to 260℃. (2) Mixing: Add each raw material in the rubber sheet to the internal mixer for internal mixing. When mixing, first add EPDM rubber, then add zinc methacrylate, zinc oxide, antioxidant RD, anti-scorching agent, defoamer, carbon black N220, carbon black N85, and calcium carbonate. Discharge the rubber and cool it to room temperature. Add a section of material to the internal mixer, add DCP, discharge the rubber and cool it to room temperature. (3) Calendering: The mixed rubber is calendered in a calender to form a rubber sheet with a thickness of 0.5-0.8cm; (4) Cutting: Cut the rubber sheet according to the size of the vulcanizing surface of the flat vulcanizing machine and apply Chemlock adhesive evenly to one side; (5) Rubber sheet vulcanization: Place the rubber sheet on the flat vulcanizing machine, brush open one side of the Mlock and bond it to the flat vulcanizing machine, place a flat iron plate between the flat mold surface and the rubber sheet, and vulcanize the rubber sheet. (6) Apply Teflon high-temperature cloth: Cut Teflon high-temperature cloth according to the size of the rubber sheet, and apply the adhesive backing to the rubber sheet; press it with an iron plate and co-vulcanize with the rubber sheet. Vulcanization conditions: pressure 2MPa, time 1 minute, temperature 150℃; remove the iron plate after vulcanization, and the V-belt vulcanization can be carried out.

2. The vulcanization and demolding method for a V-belt plate as described in claim 1, characterized in that: In step (2) of spraying Teflon coating onto the flat mold, the temperature is raised to 90°C.

3. The vulcanization and demolding method for a V-belt plate as described in claim 1, characterized in that: In step (3) of spraying Teflon coating onto the flat mold, the polished flat mold is heated to 180°C and then naturally cooled to 60°C; the amount of primer sprayed onto the surface of the flat mold is 0.5kg / m2-0.7kg / m2.

4. The vulcanization and demolding method for a V-belt plate as described in claim 1, characterized in that: In step (4) of spraying Teflon coating onto the flat mold, the flat mold is heated to 360°C and maintained for 1 hour.

5. The vulcanization and demolding method for a V-belt plate as described in claim 1, characterized in that: In step (5) of spraying Teflon coating onto the flat mold, the amount of topcoat sprayed onto the surface of the flat mold is 0.5 kg / m2-0.7 kg / m2.

6. The vulcanization and demolding method for a V-belt flat plate as described in claim 1, characterized in that: In step (6) of spraying Teflon coating onto the flat mold, the flat mold is heated to 450°C and maintained for 1 hour.

7. The vulcanization and demolding method for a V-belt plate as described in claim 1, characterized in that, In step (1) of making the adhesive sheet and applying Teflon high-temperature cloth, the weight parts of each component in the adhesive sheet are as follows: EPDM: 100, zinc methacrylate: 5, zinc oxide: 5, antioxidant RD: 1, anti-scorching agent: 0.9, defoamer: 2.6, carbon black N220: 20, carbon black N85: 20, calcium carbonate: 20, DCP:

6.

8. The vulcanization and demolding method for a V-belt plate as described in claim 1, characterized in that: In step (2) of the preparation of the rubber sheet and the application of Teflon high-temperature cloth, EPDM rubber is first added and mixed for 50-60 seconds at 100°C and 36 rpm. Then zinc methacrylate, zinc oxide, antioxidant RD, anti-scorching agent, defoamer, carbon black N220, carbon black N85, and calcium carbonate are added and mixed for 100-110 seconds at 160°C and 36 rpm. The rubber is then discharged and cooled to room temperature. A section of material is added to the internal mixer and mixed for 20-30 seconds. DCP is added and mixed for 30-40 seconds at 85°C and 25 rpm. The rubber is then discharged and cooled to room temperature.

9. The vulcanization and demolding method for a V-belt plate as described in claim 1, characterized in that: In step (4) of making the adhesive sheet and applying Teflon high-temperature cloth, the amount of adhesive used is 0.1kg / m2-0.2kg / m2.

10. The vulcanization and demolding method for a V-belt plate as described in claim 1, characterized in that: In step (5) of making the rubber sheet and applying Teflon high-temperature cloth, the vulcanization conditions are: pressure 5MPa, time 90 minutes, and temperature 150℃; in step (6) of making the rubber sheet and applying Teflon high-temperature cloth, the vulcanization conditions are: pressure 2MPa, time 1 minute, and temperature 150℃.

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