As a basic material in the production of rubber products, the quality and processing performance directly affect the performance of the final product. However, in actual production, mixed glue is often placed too long for various reasons, causing the liquidity of the rubber to decrease, and even partial vulcanization. This phenomenon not only increases production costs, but also causes a large amount of rubber. This article will start from the nature of mixed glue, combined with heating and re -refining, plasticizer use, formula adjustment, adding anti -cavity and other remedial measures to explore in detail how to save and place too long mixed glue to help the rubber industry practitioners improve Production efficiency and reduce material waste. First, the problem of mixed glue for too long will be produced by the mixed glue in the production of rubber products. It is usually mixed by mixed processing of raw glue, fillers, sulfurizers, and promoters. The mixed glue has a certain operation window period. Within this time, the rubber can perform processing operations such as pressure extension, extrusion and vulcanization. However, when the mixed glue is placed for too long, especially in high temperature and high humidity environment, some cross -linking or pre -sulfide reactions may occur inside. In this case, the liquidity of the rubber decreases, the difficulty of processing has increased, and even the risk of scorching (early vulcanization) occurs during processing. Common mixed glue placement problems include:
1. Decrease in liquidity: The viscosity of rubber increases, and it is difficult to perform subsequent processing operations.
2. Part of the pre -vulcanization: The intensity of the collagen increases, which causes it to sulfate in advance during the processing process, and cannot achieve the ideal vulcanization effect.
3. Increase the risk of burning: When the plasma with too long time is placed at high temperature, it is very easy to occur in the phenomenon of scorching and cannot continue processing. In order to save the mixed glue that is too long, we can take the following measures:
2. Heating and re -refining: restoring the liquidity of glue and heating and heating is a common remedial measure. It is especially suitable for the interior of the rubber. Some cross -linking situations occur. By proper heating, you can soften the rubber, reduce its viscosity, and make it re -get good liquidity. Generally, the heating temperature should be controlled between 60 ° C and 90 ° C to prevent excessive temperature reaction from excessive temperature. The heating time should also be extended to 1.5 times to 2 times to ensure that the rubber can be fully dispersed and uniformly mixed. Operation recommendations:
1. Place mixed glue in an environment of 75 ° C to ensure that the temperature does not exceed 90 ° C, so as not to cause premature vulcanization.
2. Increase the mixing time and extend to 1.5 times the usual mixed time. For example, the original 10-minute mixing time can be extended to 15-20 minutes.
3. Monitor the liquidity and viscosity of the glue in real time, adjust the mixed temperature and time in a timely manner to ensure that the rubber re -gets good processing performance. Through this method, the liquidity of excessively long plastic plastic plasma can be effectively restored to avoid difficulty in processing due to decreased liquidity.
3. Add plasticizer or softener: The addition of glue elastic plasticizer or softener is another common remedial measure. By increasing the plasticizer, the viscosity of the glue can be reduced, and its flexibility and ductility can be improved. Commonly used plasticizers include paraffin oil, dilin (DOP), and cycloid oil. The amount of addition is usually controlled between 5%and 10%of the total amount of rubber. The use of plasticizers can not only restore the liquidity of glue, but also improve its processing performance.
Suggestions:
1. The amount of plasticizer should be adjusted according to the specific situation of the rubber, and it is usually controlled at 5%-10%of the total weight. For example, 5-10 kg of plasticizers can be added to 100 kg of mixed glue.
2. The uniform distribution of plasticizers is critical to the final performance, so the mixed time should be extended appropriately to ensure that the plasticizer is fully mixed with the rubber.
3. Excessive plasticizer will affect the mechanical properties and durability of the rubber, so the relationship between the dosage of the plasticizer and the performance of the rubber needs to be carefully balanced. The addition of plasticizers can restore the elasticity and processing performance of the glue to a certain extent, especially when the glue is partially premedated. Fourth, adjust the formula: Add fresh mixed glue or raw glue For some pre -sulfide glue, simple heating and plasticizers may not fully restore its processing performance. At this time, you can adjust the formula to add fresh mixed glue or raw glue to dilute the part where the prefabricated part has been diluted, thereby improving its overall processing performance.
Operation suggestions:
1. It is recommended to add a proportion of fresh mixed glue or raw glue to 10%-30%of the total weight of the rubber. For example, in a 100 kg aging mixed glue, 10-30 kg of fresh mixed glue or raw glue can be added.
2. The mixing time should be appropriately extended to 1.3-1.5 times to ensure that the new and old rubber is fully mixed.
3. The addition of fresh glue can reduce the cross -linking density of the overall rubber and improve its ductility and processing performance. By adjusting the formula, some pre -sulfidized areas of aging glue can be effectively diluted, and their overall processing and mechanical properties can be improved. V. Dilute sulfur dosage: Slowing the vulcanization reaction In some cases, the mixed glue that has been placed for a long time may have lost the activity of a part of the vulcanizing agent, resulting in the glue showing abnormal vulcanization or insufficient vulcanization during the subsequent vulcanization process. At this time, the diluted sulfur dosage can slow down the sulfide reaction and extend the processing window period of the rubber.
Operation recommendations:
1. It is recommended to reduce the dosage of a vulcanizer by 10%-20%. For example, in the case of 2%in the original formula, it can be reduced to 1.6%-1.8%.
2. After reducing the vulcanizing agent, the vulcanization reaction will slow down, which can extend the operation time of the rubber and avoid prematurely burnt during the processing process. While reducing the amount of sulfurizer, you can adjust the impact of reducing the amount of vulcanizer by adjusting the proportion of other additives (such as promoters and activists) to ensure that the final vulcanization performance of the glue meets the requirements.
6. Add anti -cavity: extend the burning time to prevent premature vulcanization of dental dental densely used to delay the coating time of the rubber, which can effectively prevent premature vulcanization during mixing and processing. The main role of anti -cavity is to inhibit the activity of sulfurizers, so that it maintains a longer operating window period during processing. Commonly used anti-scoccoles include CTP (N-Ringji-based sulfurbinylbenamidamidide) and PVI (Prevulcanization Inchibitor).
Suggestions:
1. The recommended amount of anti-cavity is 0.2%-0.5%of the total weight of the rubber. For example, 200-500 grams of anti-cavity can be added to 100 kg of mixed glue.
2. Anti -cavity should be added in the early stages of mixed to ensure that it can be fully mixed with other components and exert the best anti -focus effect.
3. While adding anti -cavity, the proportion of sulfurizers and promoters may need to be appropriately adjusted to ensure that the glue can eventually achieve the ideal vulcanization effect while delaying the vulcanization reaction. Through the use of anti -cavia, the coking time of the rubber can be significantly extended, reducing the risk of scorching the coating during high temperature processing.
7. Comprehensive adjustment and process optimization In actual operation, the above measures often need to be used in comprehensive use to achieve the best remedy. For example, while adding plasticizers, you can add an appropriate amount of anti -cavity, or add fresh glue to remedy the pre -sulfurized mixed glue by adjusting the formula. In specific operations, the characteristics of the glue, the requirements of the final product, and the specific conditions of the processing process are needed to flexibly adjust the parameters.
Through a series of process adjustments, the mixed glue that is too long can restore its processing performance and re -applies to the production of rubber products.
Through reasonable remedial measures, placing long mixed glue can restore its processing performance to a certain extent and re -applies to production. Heating and re -refining, the addition of plasticizers, formula adjustments, and anti -focusigo are all effective remedy. Reasonable use of these methods can significantly improve production efficiency, reduce material waste, and ensure the quality of the final product. In the future, with the advancement of technology, the development of anti -focus and remedy technology will bring more innovation and application opportunities to the rubber industry.