Other factors influencing the properties of Wuhan Handern high polymer blends
DATE：2020/6/9 8:28:34 / READ： / SOURCE：This station
Other factors influencing the properties of Wuhan Handern high polymer blends
The factors that affect the performance of polymer blends are the nature and content of the blend components, the compatibility between the components, and the structure of the interface layer. In addition, processing performance also plays an important role. www.handern.com Meltblown non-woven equipment
1. The particle size of the dispersed phase
The performance of the blend is closely related to the particle size of the dispersed phase, and there are large changes according to the performance requirements of the blend. www.handern.com Melt-blown non-woven equipment If the dispersion is not good in the process, it may get a rough structure of several hundred microns, then the mechanical properties are very poor. If it is well dispersed, for example, 1 to 2 m, a fine structure can be obtained with good mechanical properties.
2. Factors affecting particle size
The main factors affecting the particle size of the dispersed phase are particle size and processing temperature. www.handern.com Meltblown non-woven equipment
(1) Drilling degree If the particle sizes of the two polymers are relatively close, a fine structure with a small particle size can be obtained. If the viscosity of the two differs greatly, the result is a larger rough structure. This is because the shear deformation is concentrated in the softer polymer, increasing the heterogeneity of the phase structure. www.handern.com In order to adjust the viscosity of the melt-blown non-woven equipment, the two polymers with very different viscosities can be mixed evenly. Softeners or oils can be added to the components with high dryness to reduce their viscosity. . For example, in the blending of nitrile rubber and polyvinyl chloride, a small amount of plasticizer is added in order to make polyvinyl chloride and butyl rubber easy to mix and mix. Or add carbon black to the softer polymer to increase its viscosity. In addition, the temperature and the molecular weight of the polymer will have an impact on the viscosity, and the rational choice of polymer grade and processing conditions can also achieve the purpose of adjusting the viscosity.
(2) Processing temperature The temperature at which rubber and plastic blends are processed is also an important factor affecting particle size. Processing at high temperature may cause the re-aggregation process of the dispersed particles, thereby reducing the performance of the blend. This is often seen during injection molding. www.handern.com Meltblown non-woven equipment
Add a small amount of rubber to the plastic to improve the impact resistance of the plastic. www.handern.com Meltblown nonwoven fabric equipment The size of the rubber cohesive particles as the dispersed phase has an important influence on the performance of the blending system. When the blending system is impacted, the tiny rubber particles can undergo large deformation and absorb part of the impact energy, thereby improving the impact resistance. www.handern.com Melt-blown non-woven equipment such as polypropylene and EPDM rubber blending system, when the rubber particle size is 1, m, its impact toughness of polydiene is much better than that of 2, 6 m Much larger, when the particle size distribution of the rubber particles is relatively tolerant and the average particle size is within a certain range, they can effectively increase the impact strength. For example, the size of rubber particles in commercial impact polystyrene is between 1 and 1 m, and the initial performance is the best.
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