Rubber sealing strips are sealing products processed from rubber as the main raw material, mainly using the elasticity of the lip, cavity, flange and other parts to generate contact pressure with the surface of their contact objects to achieve sealing effect. Tire recycled rubber is made of waste tire rubber parts as raw materials, and is made by crushing, desulfurization, refining and other processes, retaining the basic performance characteristics of rubber. What are the issues to look out for when using tire recycled rubber to produce rubber seals?
1. The application of tire recycled rubber in rubber seals
Rubber seals require good processing safety, low Mooney viscosity, no frost spraying, small discoloration, good tensile properties, compression set resistance and cold resistance, etc., and rubber seals used outdoors for long-term E5LYY827 require good weather resistance, ozone resistance, and aging resistance. Natural rubber, neoprene, styrene-butadiene rubber and their combined rubber can produce ordinary rubber sealing strips; When it is required that the rubber material is heat-resistant, ozone-resistant and aging-resistant, EPDM or neoprene can be selected, and nitrile rubber is used for oil-resistant rubber seals.
The main components of tire recycled rubber are natural rubber, general-purpose synthetic rubber (styrene-butadiene rubber, butadiene rubber, etc.) and carbon black, which are compatible with natural rubber and styrene-butadiene rubber, and can be used alone or in combination with natural rubber and synthetic rubber to produce rubber seals, effectively reducing the cost of raw materials. It should be noted that rubber seals are not suitable for tire recycling rubber when they have strict requirements for high and low temperature resistance, aging resistance, and heat resistance; Some oil-resistant rubber seals can use a small amount of tire recycled rubber.
2. Tire recycled rubber reduces the production cost of rubber seals
(1) Tire recycled rubber selection skills
When using tire recycled rubber in the production of rubber seals, it is necessary to choose the appropriate index of tire recycling rubber according to the physical needs of the sealing strip, it is recommended to choose 60 mesh and more than 60 mesh tire recycled glue, high fineness, less impurities, the produced rubber seal has a better appearance, and is not easy to appear bubbles and other problems; Considering the migration of tire recycling glue, the rubber sealing strip produced by using tire recycling rubber without migration is not easy to change color and migrate, such as spraying handwriting is not easy to yellow.
(2) Reasonably control the amount of tire recycled rubber
When adding tire recycled rubber in rubber sealing strips to reduce costs, it needs to be determined according to the use of the sealing strip and performance requirements: the dosage of tire recycled rubber in high-performance sealing strips is generally 10%-30%; The amount of tire recycled rubber in mid-range rubber seals can be increased to 40%-70%; Ordinary solid rubber seals can be completely used with tire recycled rubber, and 10%-20% natural rubber can be mixed if necessary.
(3) Selection skills of rubber sealing strip compound for tire recycled rubber production
Using tire recycled rubber to produce rubber seals, supporting compounds, such as ointment, can be added in an appropriate amount to improve the stiffness of the rubber and reduce deformation; polymer wax, improve the appearance quality and dimensional stability of the sealing strip; Modified plastics such as PE and PP reinforce structural support and prevent collapse after extrusion. To improve the processing performance of tire recycled rubber sealing strips, the following three compounds, magnesium carbonate, can be used to reduce the parking deformation of semi-finished products; clay to increase the extrusion speed and improve the surface smoothness of the sealing strip; Paraffin oil and naphthenic oil increase the fluidity of the rubber and prevent scorching.
(4) Processing technology skills for rubber sealing strips produced by tire recycled rubber
When using tire recycled rubber alone or tire recycling rubber with natural rubber, styrene-butadiene rubber, etc. to produce low-cost rubber seals, it is recommended to use a mixer to mix and control the loading capacity, temperature and feeding order, and the feeding order is generally as follows: recycled rubber→ active agent, solid softener→ anti-aging agent, ordinary accelerator→ carbon black→ liquid softener→ sulfur and overspeed accelerator. When the rubber seal strip is extruded, the mouth shape needs to be corrected by trial and error, and the principle of "cold body, warm machine head, hot mouth type" is followed when extrusion.
In actual production, tire recycled rubber can be used in the production of various solid core seals and sponge seals, and the formulas of sealing strips in different use occasions are different.
Exclusive original article [commercial authorization] reprint, excerpt and excerpt in any form are prohibited without written authorization. Focus on Hongyun rubber: learn the process formula and raw material technology of producing rubber products from recycled rubber to help you reduce costs and increase profits