Which has stronger tensile strength, latex reclaimed rubber or black reclaimed rubber? Latex reclaimed rubber is rubber regenerated from natural latex products such as waste latex gloves after vulcanization removing, with high strength and good elasticity; black reclaimed rubber generally refers to tire reclaimed rubber processed from used tire rubber, which has good wear resistance and low price. In the production of many rubber products that use natural rubber as the main raw material, latex reclaimed rubber or tire reclaimed rubber is used to reduce costs. So which has greater tensile strength among the two?
1. Factors affecting the tensile strength of reclaimed rubber
The tensile strength of reclaimed rubber is used to characterize the ultimate ability of the rubber material to resist tensile failure. It refers to the load per unit cross-section when the test piece is stretched to break. The type and quality of reclaimed rubber, production process, and reclaiming agents all affect the tensile strength of reclaimed rubber.
(1) Reclaimed rubber type: Natural rubber has good self-reinforcing properties. Latex reclaimed rubber made from waste natural rubber and its products has the highest tensile strength, followed by styrene-butadiene rubber and polybutadiene rubber; nitrile rubber and EPDM have high polarity and high saturation, so after reclaiming, their tensile strength is relatively low.
(2) Rubber content: The higher the rubber content in reclaimed rubber, the more effective hydrocarbon content, and the higher the strength.
(3) Internal structure: The production process of reclaimed rubber causes the rubber molecular chains to break. The finer the reclaimed rubber, the more serious the molecular chain damage, and the lower the tensile strength.
(4) Impurity content: Impurities such as metals, fibers, soil, etc. in waste rubber can defects, reducing the strength of reclaimed rubber.
(5) Production process: Reclaimed rubber processed using advanced devulcanization technology has higher tensile strength.
(6) Reclaiming agents: The type and amount of reclaiming agents used in the production of reclaimed rubber directly affect the degree of devulcanization. Insufficient amount leads to incomplete devulcanization, residual crosslinked networks, and poor plasticity; excessive amount causes excessive molecular chain degradation, reduced molecular weight, and decreased strength.
2. Comparison of strength among latex reclaimed rubber and tire reclaimed rubber
Overall, the tensile strength of latex reclaimed rubber is higher than that of black tire reclaimed rubber. This is because latex reclaimed rubber retains the polymer structure of natural rubber, has a high hydrocarbon content, and better mechanical properties. High rubber content E5LYY1015 latex reclaimed rubber can reach a tensile strength of over 17 MPa; tire reclaimed rubber mainly consists of natural rubber, synthetic rubber, and carbon black, which has good wear resistance but slightly lower tensile strength, generally 8-13 MPa.
Not all latex reclaimed rubber has higher tensile strength than tire reclaimed rubber. When selecting reclaimed rubber, rubber product manufacturers are advised to choose suitable latex reclaimed rubber based on the performance requirements and cost budget of the rubber products. Especially for black rubber products, it is recommended to choose lower-cost reclaimed rubber as much as possible while meeting performance requirements. When the tensile strength difference is not significant, black tire reclaimed rubber is generally cheaper than latex reclaimed rubber.
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