Do you really know about transparent filled masterbatches? How should I use transparent masterbatches?
2019-06-19 09:22 来源:凯杰塑料填充母料厂家作者: CR7 Time: 2019-06-19 09:22 Source: Qiagen manufacturers of plastic filled masterbatch: CR7
Why is transparent filled masterbatch called transparent filled masterbatch? Many people will misunderstand that the material is transparent or added to the product to increase transparency. In fact, they are all wrong. Let you know.
Many people will misunderstand that the transparent filling masterbatch is a material that increases transparency or a filler that does not affect transparency. In fact, this is not the case. No matter what filler is used, it will affect transparency. 是由矿物粉末及树脂等构成，但由于矿物粉末折射率的问题，透明母料并不能增加塑料的透光性，只是尽可能地减少对塑料透光性的影响。 The transparent filling masterbatch is composed of mineral powder and resin. However, due to the refractive index problem of the mineral powder, the transparent masterbatch cannot increase the transparency of the plastic, but only reduces the influence on the transparency of the plastic as much as possible.
The light transmittance indicates the ability of light to pass through a medium, and is the percentage of the light flux passing through a transparent or translucent body and its incident light flux. When a pseudo-parallel monochromatic light passes through a uniform, non-scattering medium, part of the light is absorbed, part of it passes through the medium, and part of it is reflected by the surface of the medium. The light transmittance can indicate the efficiency of light transmission of a display device and the like, and it directly affects the visual effect of the touch screen.
When the human light intensity I0 is constant, the greater the intensity Ia of the light absorbed by the medium, the smaller the intensity It of the transmitted light. It / I0 is used to represent the ability of light to pass through the medium. It is called light transmittance and is expressed by T, that is, T = It / I0.
What are the physical or chemical factors that contribute to the differences in plastic light transmission? Amorphous polymers are transparent as long as they do not contain pigments or fillers. Because there is no remote ordering of macromolecules of amorphous polymers, there is no change in refractive index inside the material. Without fillers and pigments, there is generally no diffuse reflection in the light wave range. So they are transparent. For example, pmma, pc, ps, pvc, abs are all amorphous structures. But the abs is opaque because it contains butadiene particles.
The value of the light transmittance is a percentage, and the value ranges from 0 to 100%. If the light is totally absorbed by the medium, It = 0, T = 0. If the light is completely transparent, then It = I0 and T = 100%. The reciprocal of the light transmittance reflects the degree of light absorption by the medium. In order to facilitate the calculation, the logarithm of the reciprocal of the transmittance is taken as the absorbance, which is expressed by A, that is, A = Ig (1 / T) = lg (I0 / It).
In simple terms, the closer the light transmittance of the raw materials in the transparent masterbatch to that of plastic, the smaller the impact on transparency.
Although the transparent masterbatch is the filler with the best transparency among the fillers, it must be used with care. Because the material of the transparent masterbatch is Yuanming powder, commonly known as anhydrous sodium sulfate, this material determines the salty taste of the transparent masterbatch. And there is no way to change. Salty things have a certain degree of corrosiveness. If they are left in the equipment that is not turned on for a long time, the equipment will risk corrosion. Therefore, care must be taken during use to avoid the presence of transparent masterbatch in the equipment.
Secondly, the molecules of the transparent masterbatch are active, and adding more than 10% will precipitate onto the surface of the plastic product, and it will not finish. Therefore, the addition ratio is also an important point of using transparent masterbatch. The 10% ratio is only for single-layer products. The equipment for three-layer co-extrusion can be determined according to the situation.
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