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The application of multivariate compounding theory in the development of transparent film masterbatch (IV)

2.3 the development of transparent film masterbatch

it is necessary to strengthen the supply side management. 1. The selection of process route:

in today's world, plastic masterbatch needs to be tested, evaluated and used for too long, mainly including internal mixer method, reactor method and extruder granulation method. According to the actual situation in China, we choose the extruder granulation method. Its advantages are: easy processing, convenient management, high production efficiency, no pollution to the environment, etc

the specific process flow diagram is as follows:

2. Selection of inorganic powder:

the core idea of the development of transparent film masterbatch has three points: first, how to be transparent, second, how to maintain mechanical properties, and third, how to reduce costs. For the first and third points, the selection of inorganic powder is very important

first of all, calcium carbonate (heavy calcium and light calcium) that strives to provide the best service to all customers is fully studied, including the so-called "transparent calcium carbonate". The test shows that calcium carbonate filler cannot guarantee transparency. It's not that the eyes see the "transparent stone" ground into powder and added to plastic, which will become transparent. It's not that the whiter the color, the more transparent it is. The transparency of plastic film only depends on one point, namely, light transmittance. The light transmittance of plastic film can reach 91%, while the light transmittance of plastic film is determined by the refractive index, such as the refractive index of PE is 1.55. As long as the refractive index of the micro crystal of the filler is close to 1.55, the combination of the two can ensure transparency. Too high or too low will damage the light transmittance

based on the above understanding, we choose talc, mica, wollastonite, kaolin, bentonite, etc. The final test shows that the crystal refractive index of Haicheng Talc powder is 1.54, which is close to PE

because the thinnest film is less than 1 wire, that is, 10 microns, we choose the talc powder produced by Liaoning Haicheng AIHAI talc company as the inorganic powder for the production of transparent film masterbatch. Its average particle size is 5 microns

at the same time, ultrafine talc powder also has the toughening effect of inorganic rigid particles

3. Selection of formulation system

in the past, people were only used to binary composite system, that is, polymer/inorganic powder. Although the surface of inorganic powder was modified, the direct entry of inorganic powder into polymer would greatly reduce the mechanical properties of composites. This fatal weakness cannot be overcome

now, we can overcome this shortcoming by using ternary composite system, namely polymer/elastomer/inorganic powder. For inorganic powder, first coat a small amount of elastomer (rubber, especially buffer drop) on the surface to form composite particles with soft outside and hard inside, and then add them to plastic to obtain good properties. The most important thing is to ensure the toughness of the material while ensuring the rigidity and strength

the development from binary composite system formula to ternary composite system formula is an important key to ensure the development of transparent film masterbatch

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