Color Masterbatch PP raw materials are typical of the crystalline polymer, in order to improve its transparency, you can consider from the following seven aspects:
    01, the matrix resin resin itself
    The transparency of the matrix resin resin itself has a great influence on the transparency of the PP product. In order to improve the transparency of the PP, a small amount of a polyacrylate resin excellent in transparency and compatibility can be added.
    02, nucleating agent
    Nucleating agent: can significantly improve the crystallization rate, improve the crystallization rate and crystal fine ratio.
    (1) inorganic nucleating agent inorganic nucleating agent with ultrafine talc and SiO2, including calcium carbonate, mica powder, inorganic pigments and fillers, low prices, rich sources, but the product gloss and transparency have a certain influences.
    (2) organic nucleating agent organic nucleating agent is a nucleation of low molecular weight of organic matter, to sorbitol and its derivatives as the representative of its compatibility with the matrix resin is good, can significantly improve product transparency And surface gloss.
    (3) the amount of nucleating agent in terms of sorbitol, the amount of nucleating agent more than 0.3%, the transparency improvement effect is not obvious, or even decline; but the amount of less than 0.2%, the number of nucleation, transparency increased not enough. It can be seen that the amount of nucleating agent is preferably between 0.2 and 0.3%. Therefore, the appropriate content of the nucleating agent can better improve the transparency of PP.
    03, extrusion temperature
    The temperature is too high, low molecular weight substances in the nucleating agent will produce decomposition and evaporation, reducing the nucleating agent in the active ingredient, reducing the transparency of the improvement effect, and the higher temperature, will destroy the PP in the original nuclei, Heterogeneous nucleation center, resulting in reduced effect of modification; and the temperature is too low, the dispersion of the nucleating agent is not good, the transparency effect is poor. Therefore, the choice of a suitable extrusion temperature to improve the transparency is particularly important.
    04, toughening agent
    Toughening agent due to the toughening agent and PP and can not be miscible, refractive index is also different, will occur in the interface of refraction, thus affecting the light transmission. With the increase in toughening content, the interface area is also stronger, the light transmission of the product is worse.
    05, process parameters
    Process parameters of the ideal processing temperature, cooling temperature, injection pressure and other process parameters on the transparency of PP is also a great help.
    Processing temperature: to meet the processing conditions, the lower the processing temperature, the smaller the size of the crystal, the transparency is better;
    Cooling temperature: the lower the cooling temperature, will reduce the crystallinity, transparency will be better.
    Injection pressure, injection time, and holding time will affect the orientation of the molecule. And the orientation will affect the crystallization of molecules, so without affecting the performance of products and appearance conditions, shorten the injection and holding time and reduce the pressure, can be a certain extent to improve its transparency.
    06, forming processing technology
    Molding process comparison Note, pull, blowing process products, found to injection, blowing process to increase the transparency of the most useful.
    07, mold
    The higher the finish of the mold, the better the transparency of the product.