How to use colorants

Introduction: colorants are widely used, so how to use them? Baibai safety net will introduce you There are many kinds of colorants and they are widely used How to use them? 1 The types of plastic colorants are divided into four types according to their physical forms: powder colorants - toner; paste colorants - color paste; liquid colorants; solid colorants - Color Masterbatch Among them, powder and solid colorants are widely used Therefore, the other two colorants are not discussed in this paper 2 Characteristics of various colorants 2.1 coloration characteristics of toner the method of coloration of plastic particles directly by using toner (pigment or dye) and adding appropriate amount of powdery auxiliaries is also called dry coloration Its advantages are good dispersion, low cost and small batch operation Because it saves the consumption of human and material resources in the processing of other colorants, such as color masterbatch, color paste, etc., the cost is low, and the buyer and the seller are not limited by the quantity It is impossible to make 1-2kg Color Masterbatch, but the color powder can be arbitrarily assigned according to the needs, so it is very convenient to prepare Compared with other granulation coloring, the processed resin undergoes one degradation process less, which is beneficial to reduce the aging of plastic products and increase its service life 2.2 coloring characteristics of Color Masterbatch In order to overcome the disadvantages of color powder coloring and improve the quality of plastic products, with the continuous development of the plastic industry, the continuous innovation and breakthrough of the types of plastic resins, additives, processing equipment and technology of plastic products, another way of plastic coloring - masterbatch coloring has been widely used, and the technology of masterbatch coloring has been constantly improved in application and practice The so-called masterbatch is to mix pigments (or dyes) into the carrier by using a certain process and corresponding equipment under the action of auxiliaries Through heating, plasticizing, stirring and shearing, the molecules of pigment powder and carrier resin are fully combined, and then particles of similar size with resin particles are made This kind of high concentration colorant is called masterbatch Its function is similar to saccharin When it is used, the purpose of colouring resin can be achieved only by adding a small proportion (1% - 4%) to colouring resin 3 the choice of general color masterbatch and special color masterbatch is just because color masterbatch has many advantages over color powder With the development of plastic products processing industry, especially the establishment of many joint ventures and the improvement of color requirements of export products, color masterbatch gradually takes the leading position According to the applicability classification of color Masterbatch, it can be divided into general color masterbatch and special color masterbatch 3.1 when the special color masterbatch is produced, the same resin as the resin to be colored is selected as the carrier, high concentration pigment (dye) is added, and under the action of auxiliary agent, after heating, plasticizing, mixing, extruding and granulating, the special color masterbatch is made, which is called special color masterbatch The concentration of special color masterbatch can be high or low, and the general addition amount is between 1% and 4% 3.2 the main difference between universal color masterbatch (also known as "universal color masterbatch") and special color masterbatch is that although the universal color masterbatch also uses a certain resin as the carrier, it can be applied to the coloring of other resins except the carrier resin, so it is called universal color masterbatch The so-called universal color masterbatch generally adopts the following measures (some manufacturing plants simply do not use resin as the carrier, but all use propylene wax with high melting point as the carrier): first, select the resin with low melting point and high melt index as the carrier of universal color masterbatch, such as PE or EVA; Secondly, the ratio of pigment powder in Masterbatch should be as high as possible, so the universal masterbatch must be high concentration masterbatch, and the usage in injection molding products is generally 1% Due to the fact that there are very few carriers of different media in the color masterbatch (generally around 20% after deducting the auxiliary factor), when it is diluted in the resin to be colored with 1% ratio, the content of different resins in the plastic product is 0.2kg/100 = 2G / kg In order to make the universal color masterbatch combine well with other kinds of colouring resins (good affinity), other measures are also adopted in the universal color masterbatch, such as adding more special coupling agents, prolonging the mixing time, etc., which are conducive to improving the wide applicability of the universal color masterbatch The use of colorants is relatively wide, and attention should be paid to the use of colorants in food What harm does it do to eat excessive colorants? We can rest assured that the use of colorants is in accordance with national regulations, and the food safety detector can accurately check out the food with excessive additives, so the state does not allow the food with excessive additives to enter the market More food safety knowledge is in Baibai safety net Editor in charge: he xianrob