Rubber and steel wire bonding method
Two kinds of contact with the interface between the surface of the object.Therefore, we need to contact the interface of the two objects can be mutually moist, mutual adsorption, the best to achieve close contact with molecular size.Secondly in the bonding process, the interface of molecular energy Phase and diffusion, can further increase the mutual adhesion, rubber and fiber material between the bonding is the case between the rubber and metal, especially between the brass bonding, can be sulfur (-S-) Of the chemical bond and the formation of a stronger bond. Coupling agent and rubber and sticky molecules from the chemical reaction, the formation of a strong chemical bond bonding, the bonding interface has a good anti-aging ability. Bonding technology in the production of rubber products Is very important, including between rubber and fibrous fabrics, rubber and metal components, between rubber and plastic, between different compounds, between rubber and leather and other common bonding, such as the tire, including rubber and fiber curtain Wire, rubber and bead wire, as well as the bonding between the various parts of the rubber.The strong degree of bonding directly affect the performance of the product quality and durability.
One, hard glue for the middle of the combination layer;
Two kinds of materials or two kinds of rubber, the middle with a layer of rubber adhesive layer. Such as tire tread rubber and ply between the buffer layer, rubber and metal with a combination of hard cement, are combined with adhesive layer
Second, the surface of metal brass plating, with the rubber in the vulcanization can produce a stronger chemical bond strength;
Third, with isocyanates, chlorinated rubber, phenolic resin and other adhesives, the method is simple, optional appropriate high bonding strength, widely used;
Isocyanates are the general term for various esters of isocyanic acid. Examples of the number of -NCO groups include monoisocyanate R-N = C = O and diisocyanate O = C = N-R-N = C = O and polyisocyanates.
Chlorinated rubber is made from natural rubber or synthetic rubber chlorinated modified rubber derived products, rubber is the first industrial rubber derivatives, according to the British information, in the 30-year industrial applications, no Has occurred together with chlorinated rubber contact caused by poisoning events L1. The relative density of chlorinated rubber is 1.596, its water absorption is 0.1 to 0.3, the heat stability temperature is 130 ℃, soluble in aromatic hydrocarbons, esters, ketones, ethers, animal and vegetable oils and chlorinated hydrocarbon solutions, but Do not dissolve in aliphatic hydrocarbons, alcohols and water. Industrial chlorinated rubber is generally white or milky yellow powder, flaky or fibrous, chlorine mass fraction between 62 to 65, with good heat resistance.
An important application of phenolic resins is as a binder. Phenolic resin is a versatile, compatible with a wide variety of organic and inorganic fillers. Design the correct phenolic resin, especially the wetting speed. and after the cross-linking can be abrasive, refractory materials, friction materials and bakelite powder to provide the required mechanical strength, heat resistance and electrical properties.
Fourth, directly in the compound to add a white-white system or cobalt salt system adhesive, can improve the natural rubber and copper-plated steel cord adhesive force.
The system is designed to improve the compatibility of natural rubber, synthetic rubber and metal, nylon, rayon, polyester, cotton, vinylon, glass fiber and other skeletal materials. Can be directly with the compound (direct Bo system), can also be impregnated with skeleton materials (immersion cat system). Its composition is resorcinol-formaldehyde-donor-silica.
Cobalt salt is used to enhance the adhesion of rubber and metal, has been widely recognized and widely used in radial tires and steel hose and other products. The cobalt salt can be added directly to the rubber as an accelerator for the adhesion of rubber to metal. Due to the difference between the product and each company in the bonding technology, in addition to the cobalt salt directly as a bonding enhancer, there are many companies using cobalt salt and a (white) resin adhesive system and use. But whether it is used alone or in combination, and no matter what kind of cobalt salt must control the metal cobalt content in the compound. This is because from the mechanism of adhesion, if the cobalt ion content in the compound is too high, not only promote the formation of a large number of inactive copper sulfide, but also catalyze the accelerated aging of rubber hydrocarbons; and cobalt ion content is too low, brass difficult and sulfur Active copper sulfide so that good adhesion can not be achieved. From the performance of the rubber formulation itself, it is advantageous to add a small amount of the cobalt salt to the bond, but the high ratio of the cobalt salt is not only detrimental to the adhesion after the aging of the steam, Stretch performance also has a negative impact.
It is generally recommended that the amount of cobalt salt should not exceed 0.3% of the mass of the rubber in the formulation, that is, the metal cobalt content of 100 parts of the rubber hydrocarbon is not more than 0.3 parts. Due to the technical differences between each company, this amount is for reference only.
Since the average molecular weight of the various cobalt salt binders is different, it is necessary to convert the amount of metal cobalt actually required into the number of cobalt salt binder in the formulation. For this purpose, the number of copies of the actual recipe can be calculated by:
Number of recipes = cobalt content of cobalt / cobalt content of the product (where the amount of metal cobalt should be in the 0.15-0.35 points)
Example: Calculate the number of formulations of RC-B23 (cobalt content: 23%) of the binder added to the formulation of 0.25 parts of cobalt.
Number of recipes = 0.25 / 23% = 1.08 parts