Butyl recycled rubber retains the basic performance characteristics of butyl rubber, which can replace some butyl rubber to produce rubber products and reduce raw material costs Self-adhesive butyl putty rubber is a high-performance sealing and waterproof material made of butyl rubber as the main raw material, which is widely used in joint sealing and waterproof treatment of construction, tunnels, subways, water conservancy and other projects. What issues need to be paid attention to in the production of butyl rubber putty sheets with butyl recycled rubber?
1. Can butyl recycled rubber produce self-adhesive butyl putty rubber?
Self-adhesive butyl putty rubber requires the rubber to have excellent self-adhesive, airtight, weather resistance and chemical corrosion resistance; Butyl recycled adhesive has the characteristics of good air tightness, heat resistance, aging resistance, chemical corrosion resistance, etc., which can meet the basic needs of butyl putty glue; It has good compatibility with butyl rubber and various compounds, and the price is much lower than that of butyl rubber, which can replace some butyl raw rubber to produce self-adhesive butyl putty rubber, which can reduce the cost of raw materials while improving the performance of rubber processing technology and reducing production energy consumption.
Compared with butyl rubber, butyl recycled rubber has better plasticity and fluidity, and is used in the production of self-adhesive butyl putty rubber, which can fill microscopic gaps more quickly and improve the initial self-adhesive effect when bonding with concrete interfaces or other substrates.
2. Selection tips for butyl recycled rubber for self-adhesive butyl putty rubber
When choosing butyl recycled rubber for self-adhesive butyl putty rubber, you need to pay attention to the following five points:
(1) Fineness of butyl recycled adhesive: putty glue has high requirements for the surface finish of the rubber material, and particle impurities will lead to defects in the adhesive layer, so it is recommended to give priority to ultra-fine filtered butyl recycled adhesive, with uniform appearance texture, low impurity content, no metal debris, and no coarse particle feeling.
(2) Butyl recycled rubber content: Butyl rubber content is too low will weaken the air tightness of the rubber and affect the sealing effect, so it is recommended to choose butyl recycled rubber with a glue content of more than 45%.
(3) Ash and moisture control of butyl recycled rubber: too high ash content in butyl recycled rubber will reduce the proportion of effective rubber components, affect the density and bonding strength of the putty adhesive layer, and too high moisture will lead to fluctuations in product performance.
(4) Butyl recycled rubber Mooney viscosity: choose butyl recycled rubber with Mooney viscosity of 40-60, too high Mooney will cause difficulty in eating powder and increase energy consumption during mixing; Too low Mooney means excessive degradation, and the mechanical properties and elastic recovery rate of the finished product are difficult to meet the standard.
(5) Mechanical strength of butyl recycled adhesive: choose butyl recycled adhesive with a tensile strength of 6.5MPa-8.5MPa and a tear elongation of 350%-480% to ensure the integrity and durability of the adhesive layer.
3. Key points of low-cost self-adhesive butyl putty rubber formulation for butyl recycled rubber production
The doping ratio of butyl recycled rubber in self-adhesive butyl putty rubber is determined according to the specific needs of putty rubber, and is generally controlled among 20% and 70%. When using butyl rubber/butyl recycled rubber E5LYY1126 to produce vulcanized putty film, it is recommended to use sulfur-autumn ram system (good mechanical properties) or phenolic resin system (better heat resistance and durability); For the reinforced filling system, semi-reinforced carbon black can be used, with talc, calcium carbonate, etc.; Use paraffin oil or aromatic oil to reduce the hardness of the compound, improve the softness at low temperature, and prevent brittle cracking in winter construction.
55% high-strength odorless butyl recycled rubber is made of waste butyl inner tube as raw material to add 5% butyl raw rubber, using German far-infrared desulfurization and adding 5% butyl original rubber in the production process, after international reducing rubber molecular technology treatment and then tablet molding, with strong air tightness, heat resistance, ozone resistance, aging resistance, shock absorption, high strength, good feel elasticity, environmental protection and tasteless and other characteristics, can be used with butyl rubber to produce self-adhesive butyl putty rubber, reducing the cost of raw materials by 20%-35% while ensuring quality. What other issues need to be paid attention to when using butyl recycled rubber to reduce the production cost of self-adhesive putty rubber?
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