In the production process of natural rubber products, rubber products manufacturers need to use softeners or plasticizers to form a softening and plasticizing system and softening rubber materials to improve the plasticity and fluidity of natural rubber, and provide better processing operations such as subsequent calendering and extrusion. The processing conditions. In actual production, there are many types of rubber softening plasticizers; the same softeners and plasticizers have different effects in different types of rubber. So which softeners and plasticizers are suitable for the production of natural rubber products? How much is appropriate?
1. Commonly used varieties
In actual production, the commonly used physical softeners for natural rubber products are pine oil softeners such as pine tar and various petroleum softeners; the above-mentioned softeners can give natural rubber better viscosity and softness, and facilitate subsequent mixing. Process operations such as refining, calendering, and extrusion molding. Chemical plasticizers, also known as peptizers, can improve the plasticizing effect of natural rubber by reducing the force between rubber molecules, shorten the plasticizing time, and then improve the mixing efficiency; the commonly used chemical plasticizers for natural rubber products are SJ-103 And 12-I.
2. Selection skills
When using natural rubber to produce all kinds of rubber products, rubber product manufacturers need to select the appropriate brand of natural rubber according to the actual performance requirements of the product, and use different types of softeners or plasticizers. Generally speaking, natural rubber products 2LLYY1012 usually use physical softeners when using standard rubber; when using smoked sheet glue and Zou sheet glue with higher Mooney viscosity, chemical peptizers are used to significantly improve the plasticity and fluidity of natural rubber. To a certain extent, further improve the physical and mechanical properties of natural rubber vulcanizates.
3. Common dosage
The amount of softener and plasticizer for natural rubber products should be determined according to actual needs. If the amount is too small, a good softening and plasticizing effect cannot be achieved. If the amount is too much, it is easy to cause problems such as the mechanical strength of natural rubber vulcanized rubber and the surface of softener spraying. . Under normal circumstances, the amount of pine tar in natural rubber products should be controlled at 4-5 parts, and the amount of petroleum softeners should be controlled at 5-15 parts; the amount of chemical peptizers should not be too much, and control at 0.1-0.3 parts can achieve good results If necessary, it is better to use accelerator M or DM for plasticizing effect.
It should be noted that when natural rubber products use chemical peptizers to improve the plasticity and fluidity of raw rubber, the mastication process must be carried out in an internal mixer; the natural rubber mastication process softened by physical softeners must be carried out in the open mixer, It can be carried out in the mixer.
In actual production, to improve the plasticity and fluidity of natural rubber, you can also use latex reclaimed rubber or tire reclaimed rubber in an appropriate amount, which can not only reduce the raw material cost of natural rubber products, but also improve the raw rubber mixing process, improve the vulcanization performance of natural rubber, and improve natural rubber. Dimensional stability, temperature sensitivity and aging resistance of rubber products.
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