Warm Global Customers
With China Plastic Machinery
With China Plastic Machinery
Blending refers to mixing together. It is a physical method that allows several materials to be mixed evenly to improve the performance of the material. In industry, using a rubber mixer to evenly mix different rubbers or rubber and plastics into rubber is a typical example. It is also possible to add certain special performance components to the polymer to change the performance of the polymer, such as electrical conductivity.
Blending can improve the physical and mechanical properties and processing properties of polymer materials, reduce costs, and expand the scope of use.
Blending is one of the important ways to achieve polymer modification and produce high-performance new materials.
According to the production method, it can be divided into mechanical blends, chemical blends, latex blends and solution blends.
Among them, mechanical blends, that is, blends obtained by mixing different polymer solutions through rollers, extruders or strong mixers, occupy a dominant position.
Blends are generally multi-component and multi-phase systems, and their performance depends on the properties, morphology and phase interface properties of the components contained.
Using two or more rubbers together, or using rubber and various plastics together, can greatly expand the use of rubber products, significantly improve the quality and performance of rubber products, and improve the process performance of rubber materials, reduce rubber consumption and reduce product costs. When different rubbers or rubber and plastics are blended, they should have good compatibility, or use the best ratio to maximize the technical effect of blending.
Most of the existing membrane materials have strong hydrophobicity, which means that water needs to overcome higher resistance to pass through the membrane, limiting its application in aqueous phase separation systems. Hydrophobicity also makes the membrane susceptible to membrane contamination, which deteriorates the separation performance of the membrane. At this time, it is particularly important to modify the membrane. There are many reports on polymer membrane modification, and the methods can be divided into two categories: chemical modification and physical modification. Physical modification methods mainly include surface coating and blending.
Blending is the simplest and most commonly used membrane modification method. Compared with other methods, blending modification has the following advantages: modification and membrane formation are carried out simultaneously, the process is simple, and no cumbersome post-processing steps are required; the modifier can simultaneously cover the membrane surface and the inner wall of the membrane pores, especially the inner wall of the hollow fiber membrane; and it will not cause damage to the membrane structure. In recent years, amphiphilic copolymers have been blended with traditional polymer membrane materials to prepare hydrophilic separation membranes. The method of membrane has attracted people's attention. The amphiphilic copolymer molecules contain both hydrophobic chains and hydrophilic chains. The hydrophobic chains make it have good compatibility with the membrane body material, while the hydrophilic chains make the membrane have higher hydrophilicity and stronger anti-pollution ability. The hydrophilically modified blended ultrafiltration and microfiltration membranes are widely used in wastewater treatment, protein filtration, hemodialysis, biological separation and other fields.
The following factors should be considered when selecting the blending system:
1. Compatibility factor:
， Compatibility is the basic condition for blending.
， Good compatibility between the two phases is the premise that the blended product of the two-phase system has good properties (especially mechanical properties).
， Compatibility affects the difficulty of the blending process. For a two-phase system with good compatibility, the dispersed phase is easier to disperse during the blending process.
， Therefore, a polymer system with good compatibility should generally be selected for blending.
2. Crystallinity factors:
， Crystalline plastics and non-crystalline plastics have obvious differences in performance. Blending polymers with different crystallinity properties can usually achieve some complementary properties.
， Crystalline plastics usually have higher rigidity and hardness, better chemical resistance and wear resistance, and relatively good processing fluidity. The disadvantage of crystalline plastics is that they are brittle and the molding shrinkage of the products is high.
， Non-crystalline engineering plastics have the characteristics of good dimensional stability and poor processing fluidity.
3. Improvement of performance or introduction of new performance:
， Performance factors mainly consider the complementary performance between the blending components, or improve a certain aspect of the polymer performance, or introduce some special performance.
4. Price factors:
By blending expensive polymer varieties with cheaper polymer varieties, the cost can be reduced without much impact on the performance.
If you are interested in our company and machine, feel free to contact our sales engineer. We will contact you as soon as possible.