Natural latex reclaimed rubber is made from waste natural rubber, waste latex, and their products, retaining the basic properties of natural rubber. It can be used to replace expensive natural rubber for producing various rubber products, effectively reducing raw material costs while ensuring product quality. Rubber miscellaneous parts are a big category in this context. These parts are rubber products made mainly from rubber without a fixed shape or standard size, including sealing rings, shock pads, sleeves, rubber stoppers, small shock-absorbing parts, and more. What should you pay attention to when using latex reclaimed rubber?
1. Advantages of latex reclaimed rubber in producing rubber miscellaneous parts
The price of latex reclaimed rubber is much lower than that of natural rubber, and fully or partially replacing natural rubber to produce rubber miscellaneous parts can effectively reduce raw material costs. Compared with natural rubber, latex reclaimed rubber has better plasticity and flowability, requires about 40% less power for mixing, is easier to form and press sheets, and reduces processing heat generation; Latex reclaimed rubber has a fast vulcanization speed and good vulcanization flatness, making it less likely to experience the vulcanization and reversion common in natural rubber, which helps improve yield and production efficiency.
2. What types of rubber miscellaneous parts are suitable for producing latex reclaimed rubber?
Latex reclaimed rubber retains the high elasticity of natural rubber, offering high strength and low specific gravity, and good compatibility with natural rubber. It can be used in any ratio with natural rubber to produce ordinary rubber gaskets, cushioning pads, rubber foot pads, corner protectors, rubber plugs, and some low-load shock-absorbing components. Some products can fully use latex reclaimed rubber.
For rubber components with high elasticity and flexural resistance, latex reclaimed rubber and natural rubber can be used together; In ordinary component formulations, the amount of latex reclaimed rubber can be appropriately increased, or reclaimed rubber can be used entirely to reduce more raw material costs. It should be noted that latex reclaimed rubber is not suitable for producing rubber parts that are oil-resistant, heat-resistant, or in special media environments; the appropriate rubber type should be chosen according to usage conditions.
3. Key points for adjusting the formula for rubber miscellaneous parts in latex reclaimed rubber production
When mixing latex reclaimed rubber into rubber components, the simple approach of "the more reclaimed rubber added, the more economical" approach should not be followed. The fineness, Mooney viscosity, ash content, volatile content, softening level, and batch stability of latex reclaimed rubber all affect the performance of the compound and require appropriate adjustments to the rubber component formulation.
When producing ordinary rubber miscellaneous parts using natural rubber/latex reclaimed rubber together, adjustments to the vulcanization system, reinforcement system, and softening system can ensure that hardness, tensile strength, E6LYY68, elongation, and wear resistance meet product requirements. When carbon black is used in a high amount, the hardness and strength of the compound significantly increase, but excessive use may increase heat generation and processing resistance of the compound; The amount of softener in the formulation of latex reclaimed rubber rubber components needs to be determined based on the plasticity of the reclaimed rubber, as excessive amounts can easily affect the strength and dimensional stability of the reclaimed rubber components.
4. Reference formula for rubber miscellaneous parts produced by latex reclaimed rubber
Latex reclaimed rubber 100 parts, zinc oxide 5 parts, stearic acid 1.5 parts, antioxidant RD 1 part, calcium carbonate 20 parts, pine tar 8 parts, operating oil 15 parts, accelerator CZ 1.3 parts, accelerator DM 1 part, accelerator M 0.5 parts, accelerator TT 0.15 parts, sulfur 2.15 parts; Total: 155.6 parts.
When using latex reclaimed rubber to reduce production costs for rubber miscellaneous parts, it is recommended to choose latex reclaimed rubber with appropriate specifications based on the color and physical mechanical properties of the parts. For light-colored rubber parts, use white latex reclaimed rubber for easy color matching, while for dark-colored rubber parts, choose black latex reclaimed rubber for a lower price.
When producing rubber miscellaneous parts mainly from natural latex reclaimed rubber, the feeding sequence should be determined according to the equipment type and formula; For rolled, extrusion, or molded miscellaneous parts, equipment parameters should be adjusted according to the plasticity of the compound to avoid dimensional changes caused by overly soft rubber and to prevent processing difficulties caused by overly hard rubber. Reasonable use of latex reclaimed rubber in rubber miscellaneous parts can fully leverage the processing and cost advantages of latex reclaimed rubber.
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