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Petroleum resin parameter index

author£ºadmin Date£º2017/3/1 17:18:27
Acid value:
The acid value represents the carboxylic acid content of the carbon-5 petroleum resin molecule and is a measure of the degree of change of the carboxyl compound of the petroleum resin after being placed in the air.
The presence of inorganic impurities in the petroleum resin is undesirable. These impurities are incomplete residues after neutralization or corrosion in tanks and pipelines.
Wax fog point:
The compatibility between petroleum resin and elastomer is usually expressed by the wax mist point, which is the performance index related to molecular weight, molecular weight distribution and resin polarity. It is important to maintain the initial viscosity and viscosity of the adhesive. Balance effect. Petroleum resin wax has low fogging point, and the compatibility between elastomer and resin and wax system is good.
Melt viscosity:
Melt viscosity refers to the viscosity of carbon-5 petroleum resin in the molten state, which is related to the raw material polymerization process, and its molecular weight distribution will also affect the melt viscosity of carbon-5 petroleum resin.
Molecular weight:
Because of the statistical nature of the polymerization process, the molecular weight of all synthetic macromolecular compounds and the molecular weight of most natural polymers are not homogeneous and are mixtures of homologues of different molecular weights. Molecular weight and molecular weight distribution directly reflect the structural differences of polymers. The molecular weight and its distribution can affect the compatibility with the elastomer, the melt viscosity of the PSA and the cohesion /cohesion balance. When the molecular weight distribution of the resin is wide, the compatibility with the elastomer is poor, and the viscosity increasing effect is poor or the viscosity increasing effect is not obtained. When the molecular weight distribution curve deformation is large, indicating the resin polymerization process instability, leading to product quality instability.
Solubility parameters:
The solubility parameter is an indicator of the size of the energy within the reactive molecule. Assuming that the solubility parameter of the polymer is equal to or close to the solubility parameter of the solvent, the solvent is an excellent solvent for the polymer, and the polymer chain is fully stretched and expanded in the solvent. As the viscosity-increasing resin, its solubility parameter must be close to the viscous polymer. It can act as an excellent solvent for the polymer. It can reduce the chain entanglement of the polymer, increase the glass transition temperature of the mixture and dissolve it.