Common problems with rubber compounds

Rubber compound, as the basic material for manufacturing various rubber products, its performance and quality directly affect the quality and service life of the final product. However, during the processing and use of rubber, a series of problems are often encountered. This article will take you through several common problems of rubber compounds and their solutions, helping you better master the production and quality control of rubber products.

I. Frosting phenomenon

Problem description: Blooming is a phenomenon where white or colored substances precipitate on the surface of rubber products. It is usually caused by the solubility of compounding agents in rubber changing with temperature, resulting in the precipitation of compounding agents at lower temperatures.

Solution:

1. Extend vulcanization time: Ensure that rubber products are fully vulcanized to reduce the residue of compounding agents in rubber.

2. Improve the vulcanization system: Optimize the vulcanization formula to enhance vulcanization efficiency and uniformity.

3. Control the mixing temperature: Prevent the temperature from being too high during the mixing process, which may cause the compounding agent to precipitate prematurely.

4. Master the dosage of easily blooming compounding agents: Ensure that the dosage of various compounding agents in the formula is within their solubility range to avoid excessive use.

2. Lack of glue and flash

Problem description: Lack of rubber refers to the situation where rubber products fail to fully fill the mold cavity during the molding process, resulting in an incomplete appearance of the products. Flash is the excess part of the rubber compound that overflows at the parting surface of the mold.

Solution:

1. Increase the amount of glue used: Ensure that the injection hole design is reasonable and the amount of glue used is sufficient.

2. Improve mold design: Optimize the mold structure, reduce the number and size of overflow ports, and prevent the rubber compound from overflowing at the parting surface.

3. Adjust the vulcanization conditions: Appropriately extend the vulcanization time or lower the vulcanization temperature to ensure that the rubber compound flows fully and fills the mold cavity.

Iii. Tearing and roughening

Problem description: Tearing and roughening refer to the phenomena where rubber products are damaged or have a rough surface during use, usually caused by improper demolding methods or excessive vulcanization of the products.

Solution:

Improve the demolding method: Adopt a reasonable demolding method to prevent the product from being torn or scratched during the demolding process.

2. Adjust vulcanization conditions: Avoid excessive vulcanization of the products, ensure moderate vulcanization conditions, and maintain the physical properties of rubber products.

3. Enhance product strength: By adjusting the formula or adding reinforcing agents, etc., the strength and wear resistance of rubber products can be improved.

Four. The rubber surface becomes sticky

Problem description: The stickiness on the surface of rubber products is usually caused by reasons such as surface contamination of the rubber compound, blooming, or uneven rubber mixing.

Solution:

Clean the surface of the rubber compound: Ensure that the surface of the rubber compound is clean and free from contamination, and avoid the adhesion of oil stains and other impurities.

2. Solve the frosting problem: Refer to the above frosting solution methods for handling.

3. Select compatible adhesives: When designing the formula, choose adhesives with good compatibility to avoid problems caused by uneven mixing.

V. Poor adhesion between rubber and metal

Poor adhesion between rubber and metal is one of the common problems in rubber products, usually caused by the failure of adhesives, improper surface treatment of metals or unsuitable vulcanization conditions, etc.

Solution:

1. Select the appropriate adhesive: Refer to the specific user manual to choose the suitable adhesive and ensure its quality is qualified.

2. Thoroughly clean the metal surface: The metal surface must be free of rust, oil stains, dust and other impurities to ensure it is clean before applying the adhesive.

3. Control vulcanization conditions: Adjust vulcanization temperature, time and pressure, etc., to ensure a good bond between rubber and metal.

Summary

Problems encountered during the processing and use of rubber compounds are diverse. However, through reasonable formula design, strict production control and scientific solutions, we can effectively avoid the occurrence of these problems and improve the quality and service life of rubber products. It is hoped that this article can provide you with some useful references and assistance.

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