Why is C5 petroleum resin used for butyl inner tube production?

February 28, 2022
February 28, 2022 Longchang Chemical

Why is C5 petroleum resin used for butyl inner tube production?

At present, the inner tube products on the market are all produced and processed with butyl rubber or butyl reclaimed rubber as raw materials, which are determined by the excellent sealing performance of butyl rubber/reclaimed rubber. Butyl rubber/reclaimed rubber has a very low air permeability and is the best raw material for the production of inner tubes. When using butyl rubber or butyl reclaimed rubber to produce inner tube products, C5 petroleum resin is often used to adjust the physical and physical properties and Mooney viscosity of the butyl inner tube. Why? The common epoxy resins in the field of C5 petroleum resin vulcanized rubber include C5 petroleum resin and C9 petroleum resin. Among them, C5 petroleum resin has good compatibility with butyl plastic particles and belongs to alicyclic carbon chain epoxy resin, which can improve the viscosity of plastic particles. High quality and low price, so it is generally used in the secret recipe of butyl inner tube.


1. The application of C5 petroleum resin as a binder and tackifier in the secret recipe of butyl inner tube can improve the strength, tear compressive strength and elongation at break of butyl reclaimed plastic pellets, thereby improving the butyl inner tube Performance indicators, increase the lifespan.

2. C5 petroleum resin can improve the vulcanized rubber properties of butyl plastic pellets, increase the embrittlement time, improve the high efficiency of vulcanized rubber and the safety factor of production and processing.


3. C5 petroleum resin itself has good fluidity in vulcanized rubber, which can improve the lubricity and viscosity of butyl plastic pellets, reduce the Mooney viscosity of plastic pellets, and improve the ductility and fluidity of butyl rubber/reclaimed plastic pellets.

4. The finished butyl inner tube with C5 petroleum resin has good stiffness, good edge compressive strength, and small permanent deformation, which can improve the performance index of butyl inner tube.

5. C5 petroleum resin has the characteristics of SXF and other epoxy resins, but the price is lower, so it can not only improve the comprehensive performance of butyl inner tubes, but also significantly reduce the cost of raw materials.


Butyl inner tube C5 petroleum resin has high compressive strength, good viscosity, stable adhesion, high temperature resistance and aging resistance. When used in butyl inner tube products, it can improve the thermal deformation of butyl inner tube and improve the plasticity. Grain stickiness, improve the production and processing characteristics of butyl plastic pellets, improve the yield rate, and increase the service life of butyl inner tubes; It is enough to add 3-5 parts of C5 to the raw rubber. If it is too much, it will harm the physical index value and organic chemical index value of the butyl inner tube.


How much do you know about the hardening principle of resin?


Hardening process of phenolic resin

The first stage is that the thermoplastic resin reacts with urotropine to form an intermediate product containing a dimethylene amino bridge: -CH2-NH-CH2-; the second stage is that these products continue to react with resin molecules to form a huge network. The thermosetting resin of the like structure, and decomposes the ammonia. During the hardening process, it not only interacts with thermoplastic phenolic, but also reacts with free phenol to form thermosetting resin. This process does not require any catalyst and can be carried out by heating to a certain temperature.
Thermoplastic phenolic resin + (CH2)6N4D → thermosetting resin + ammonia;
13C6H5OH+(CH2)6N4 D→thermosetting resin + 8NH3;
Hardening process of polyimide
It is a polymerization process without hardener, and the polymerization process is also divided into two steps. The first step is the melting of the polyimide prepolymer at low temperature. The second step is to cyclize the prepolymer to an infusible polyimide at a higher temperature.


How does petroleum resin affect reclaimed rubber performance?


Petroleum resin has low acid value, good miscibility, water resistance, ethanol resistance, chemical resistance, chemical stability to acid and alkali, good thermal stability, can adjust viscosity, and is cheap, and is often used as a reinforcing plasticizer for rubber. As the most commonly used type of rubber, recycled rubber also uses petroleum resin to adjust the viscosity and physical and mechanical properties of recycled rubber doors. At present, the most widely used petroleum resins are C9 petroleum resin and C5 petroleum resin.

1. The vulcanization performance of recycled rubber.
The use of petroleum resin increases, the burning time of recycled rubber is prolonged, and the positive vulcanization time of recycled rubber with improved processing safety is shortened with the increase of the amount of petroleum resin used (usually 100 parts of recycled rubber use 3 parts of petroleum resin, positive vulcanization time** *Long) C9 and C5 are used in the same amount, and the vulcanization efficiency of recycled rubber using C9 petroleum resin is high.

Second, the viscosity of reclaimed rubber Mooney.
The amount of petroleum resin used increases, and the amount of C9 and C5 in which the Mooney viscosity of recycled rubber decreases is the same, and the Mooney viscosity of C9 petroleum resin recycled rubber is lower than that of C5 petroleum resin recycled rubber (Note: 100 parts of recycled rubber are added to petroleum resin, and the recycled rubber door When adding 5 parts of petroleum resin to 100 parts of reclaimed rubber whose viscosity decreased obviously, the Mooney viscosity of C9 and C5 two kinds of petroleum resin regenerated rubber is almost the same).

Third, the tensile strength of reclaimed rubber.
The tensile strength of recycled rubber decreases slightly as the amount of petroleum resin used increases (3 or less petroleum resins are used for 100 recycled rubbers, and when the amount of petroleum resins with little change in tensile strength exceeds 3, the recycled rubber the tensile strength is slightly reduced).

4. Tear elongation of reclaimed rubber.
The amount of petroleum resin used increases, and the elongation at break of the reclaimed rubber increases (when the amount of petroleum resin used in 100 parts of reclaimed rubber is less than 3 parts, the amount of petroleum resin with less change in elongation at break is the same, and the breakage of C9 petroleum resin is the same. The elongation is greater than the reclaimed rubber of C5 petroleum resin).

Fifth, the hardness of recycled rubber.
The use of petroleum resin increases and the hardness of reclaimed rubber decreases.


Refined C5 Petroleum Resin for Adhesives

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Refined C5 petroleum resin for tire rubber compounding

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