Modified novolak resin for use as tackifier
A technology of novolac and varnish, which is applied in the field of modified hydrocarbylphenol-formaldehyde novolac resin, and can solve problems such as poor viscosity
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Embodiment 1
[0035] Example 1: Preparation of hydrocarbylphenol-formaldehyde novolak resins with vinyl monomers
[0036] A hydrocarbylphenol-formaldehyde novolac resin was prepared using 100 pounds of t-octylphenol and formaldehyde. After the novolak condensation reaction was completed in the reactor, 10 lbs of alpha-methylstyrene was added to the reactor, and the mixture was heated to 150°C. Once this temperature was reached, the reaction temperature was maintained for at least three hours. After the reaction is complete, triethanolamine is added to the mixture. The solvent was removed by distillation on a downward-sloping condenser, starting at atmospheric pressure, until the bottom temperature reached 170°C. During this process, the reactor was flushed with the inert gas nitrogen. Once 170°C was reached, steam distillation was performed under reduced pressure for 30 minutes to remove unreacted monomer or solvent. Distillation under reduced pressure (27 hPa = 27 mbar) was then contin...
Embodiment 2
[0037] Example 2: Rubber Formulations Containing Modified Hydrocarbyl Phenol-Formaldehyde Novolac Tackifiers
[0038] Preparation of rubber composition
[0039] Rubber or a corresponding amount of carbon black-rubber mixture is first applied to the roller set. When the sealing sheet has been formed, it is successively mixed with a modified hydrocarbyl phenol novolak resin selected from stearic acid, zinc oxide, processing aids, antioxidants, vulcanizing agents such as phenol resin or sulfur, fillers and processing oils, and viscosity-improving of other ingredients. The mixture was then rolled for 5 minutes at a temperature of 100-120° C. (measured on the surface of the mixture processed on the roller). The temperature must be significantly above the melting point of the resins used and can therefore even rise above 120°C. The mixing is then accomplished by adding the accelerator at the usual mixing temperature, ie at a temperature at which the accelerator does not react, f...
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