Other factors affecting the properties of Wuhan Modern polymer blends
DATE：2020/7/31 8:59:28 / READ： / SOURCE：This station
Other factors affecting the properties of Wuhan Modern polymer blends
As mentioned above, the factors that influence the performance of polymer blends include the properties of the blend components, the content, the compatibility between the components and the structure of the interface. In addition, processing performance also plays an important role. www.handern.com Breathable Film Equipment
1. The size of the dispersed phase particle size
The performance of the blend is closely related to the particle size of the dispersed phase, and it varies greatly according to the performance requirements of the blend. If the dispersion is not good during processing, a rough structure of several hundred microns may be obtained, and the mechanical properties will be poor at this time. If the dispersion is better, for example, 1 to 2 m, a fine structure can be obtained with better mechanical properties. www.handern.com Breathable Film Equipment
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 Breathable Film Equipment
(1) Drillness If the particle sizes of the two polymers are relatively close, a fine structure with a smaller particle size can be obtained. If there is a big difference in viscosity between the two, a larger rough structure is obtained. This is because the shear deformation is concentrated in the softer polymer, increasing the heterogeneity of the phase structure. In order to adjust the viscosity and make the two polymers with very different viscosities evenly blended, a softener can be added to the viscosity component to form an oily substance to reduce the viscosity. For example, in the blending with polyvinyl chloride, a small amount of extender is added in order to make polyvinyl chloride and butadiene rubber easy to mix and mix. Or add people to the softer polymer to increase its viscosity. In addition, the temperature and the molecular weight of the polymer will affect the degree. A reasonable choice of the polymer grade and processing conditions can also achieve the purpose of adjusting the viscosity. www.handern.com Breathable Film Equipment
(2) Processing temperature The temperature during processing of rubber and molding blends is also an important factor affecting the particle size. Processing at high temperatures may cause the dispersed particles to re-assemble the ring, which will reduce the performance of the blend. This is often seen in the injection molding process. www.handern.com Breathable Film Equipment
Add a small amount of rubber to the plastic to improve the plastic's shock resistance. The size of the rubber particles as the dispersed phase has an important influence on the performance of the blending system. When the blended system is impacted, the tiny rubber particles can undergo greater deformation and absorb part of the magical energy, thereby improving impact resistance. For example, the blending system of polypropylene and EPDM rubber, when the size of the rubber is 1m, the initial improvement of its impact on the polypropylene is much greater than that of 2,6. When the degree distribution of the rubber particles is narrow and even When the particle size is in a certain range, they can effectively improve the impact strength. For example, the size of the rubber particles in high-resistance polystyrene is between 1 m and the initial growth performance is the best. www.handern.com Breathable Film Equipment
Author：admin