Rubber Chem Encyclopedia

Is the amount of peptizer the more rubber processing performance is better?

Create Date:2020-06-12 08:54:36Click volume:216
Is the amount of peptizer the more rubber processing performance is better?

Rubber plasticizer is a high-efficiency and energy-saving rubber processing aid. It can significantly improve the plasticity of rubber during the processing of rubber products, shorten the plasticizing time by about one third, and achieve the purpose of saving raw materials and improving production efficiency. In actual production, many rubber product manufacturers hope to use as much plasticizer as possible to further improve production efficiency, but they cannot achieve the desired results. Why? Is the amount of plasticizer used in the production of rubber products really better?

1. The action mechanism of plasticizer in rubber

In the production process of rubber products, the peptizer can produce free radicals to crack the rubber macromolecules, or close the chain end groups of the raw rubber molecules during plastication, so that it loses its activity and no longer re-agglomerates, and finally achieves an increase in the plasticity of the rubber compound. 3. The effect of shortening the plasticizing time. Mooney viscosity is one of the important indicators to measure the processing performance of rubber. Peptizer can reduce the Mooney viscosity of rubber and improve the processing performance of rubber.

2. Plasticizer reduces rubber Mooney viscosity

When using a plasticizer to reduce the viscosity of the rubber Mooney and increase the plasticity of the rubber, the decrease in the viscosity of the rubber Mooney is usually proportional to the amount of the plasticizer. For example, 300g of plasticizer can reduce the rubber Mooney by 5, and use 600g of plasticizer. 1. The rubber Mooney viscosity may decrease by 10; therefore, rubber product manufacturers often reduce the rubber Mooney viscosity by increasing the amount of peptizer 2LLYY612 to provide better conditions for subsequent processing.

3. Excessive amount of plasticizer affects the performance of rubber and products

The use of chemical peptizers can significantly reduce the viscosity of rubber Mooney, but excessive amounts of peptizers will cause the performance of the rubber to decrease. This is because when the chemical peptizer breaks the long molecular chain of the rubber into the short molecular chain, it will seriously damage the rubber molecular chain and affect the performance of rubber and rubber products. In actual production, the excessive amount of peptizer will cause the Mooney viscosity of the rubber to be too low, the rubber is easy to stick to the roller, the tensile strength of the product after vulcanization is low, and the service life is shortened.

4. Excessive amount of plasticizer accelerates consumption of anti-aging agent

Peptizers improve the plasticity of rubber by breaking large molecular chains into small molecular chains; the anti-aging mechanism of anti-aging agents is to prevent molecular chains from breaking. When the rubber product formulation contains both a plasticizer and an anti-aging agent, the two attack and defend the rubber molecular chain respectively. The plasticizer not only cannot reduce the Mooney viscosity of the rubber compound, but also accelerate the consumption of the rubber anti-aging agent. Therefore, when using a peptizer in a formula containing a chemical anti-aging agent cannot achieve the desired effect, you must not blindly increase the amount of peptizer.

Peptizers are of great significance to improve the processing performance of rubber products, reduce production energy consumption and increase production efficiency. When a rubber product manufacturer uses a plasticizer to improve the plasticity of the rubber compound, since the plasticizer will cause extremely severe damage to the rubber molecular chain, the dosage of the plasticizer should be reasonably controlled to meet the processing needs; the plasticizer in the general formula The dosage is controlled below 400g. When the plasticizer and anti-aging agent are used in the formulation of rubber products, the two compounding agents must not be added at the same time. Separate addition can achieve the desired effect.