The black masterbatch is an agglomerate obtained by uniformly supporting an excessive amount of a pigment (carbon black) in a resin. Its main components are: pigments (dye), dispersants, and carrier resins. In the black mother's specific production process, the problems of poor smoothness and poor compaction are often caused by moisture problems. Today, Xiao Bian and everyone to understand the issue of moisture in the production of black masterbatch!

▲ black chemical fiber products

Problems in the production of black masterbatch

At present, the price of black masterbatch in the country ranges from two to three thousand yuan in the low grade to two million yuan in the high grade. But no matter what grade of black masterbatch, there is a common problem: the problem of moisture. To judge the quality of a black masterbatch, or to affect the quality of black masterbatch, there are several factors: stability, dispersion, coverage, rheology, and compatibility.

In today's international economy, it is absolutely necessary for international customers to have high demands on the quality of black masterbatch and the stability of raw materials, which is also an important factor in determining the quality of black masterbatch. The main performance of the stability is that under the premise of smooth carbon black proportion, the black masterbatch can stably play the role of dyeing in the final product processing and use, and has good covering power and phase compatibility.

The moisture problem can directly destroy the stability of the product. The direct performance of the color masterbatch is that the appearance of the color masterbatch is hollow, or the center of the masterbatch is hollow, which affects the appearance of the product. The most important thing is the moisture in the end product production process. It will directly affect the stability of the dyeing process of the masterbatch in the product process, resulting in uneven partial dyeing of the product, a decrease in the coverage of the country, and even the appearance of air bubbles in the finished product, and poor solidity of the product. Visible moisture problem is a key issue that restricts the quality improvement of black masterbatch.

Moisture source analysis

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Carbon black

Carbon black is an important part of the black mother and also a functional component that provides chromosomes. Carbon black is an amorphous carbon. The light, loose and extremely fine black powder has a very large specific surface area ranging from 10 to 3000 m2/g, which is a product obtained by incomplete combustion or decomposition of organic matter under insufficient air conditions.

According to the properties of carbon black, there are: reinforcing carbon black, conductive carbon black, wear-resistant carbon black and so on. Carbon black can be used as a black dye for the manufacture of Chinese inks, inks, paints, etc. It is also used as a reinforcing agent for rubber.

Because carbon black is a material with a large surface area, it has a certain degree of moisture absorption, and its water absorption principle is mainly through the pore size. Especially in the southern regions where air humidity is high should pay attention. The amount of moisture absorbed by carbon black is mainly determined by the size of the surface area. Once the moisture content (absorbed moisture) of carbon black is higher than the amount of water that can be consumed in the production process, these excessive amounts of moisture can cause problems in the processing process. Therefore, when producing black mothers, special attention should be paid to carbon black. The problem of water absorption.

▲ Carbon black

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Carrier resin

The carrier resins mentioned here are mainly those which are based on recycled materials or partially added with recycled materials. Since the production process of recycled materials involves a problem of cleaning and drying of waste plastics. There are mainly two methods for cleaning and drying waste plastics: mechanical cleaning and manual cleaning. However, no matter what kind of cleaning method, there are inevitable moisture residues, which is the second source of moisture in the processing of black mothers.

Among them, the water absorption of carbon black is a major cause of moisture in the product.

How to solve the problem of moisture

First: The raw material (carbon black) is dried before black mastering. There are three specific drying methods:

(1) Electrothermal drying.

(2) High-speed stirring and drying.

(3) Dry sunshine.

The first of these three drying methods is more feasible, and the second method has a certain degree of difficulty in the specific operation. Because of the large specific surface area of the mystery, there are a large number of pores on the particles, which are relatively light and easy to float during the stirring process. Therefore, stirring has a certain degree of difficulty. The third method is relatively simple. But the demand for climate is high.

Second, add desiccant during processing.

At present, the commonly used desiccant on the market is a plastic dehumidification masterbatch (also known as a defoamer masterbatch). Most of the current plastic desiccant masterbatch on the market is derived from the addition of calcium oxide to the recycled material. The recycled material is used as its carrier resin. There are undoubtedly two problems to be solved: 1. Compatibility of the two resins Sexual issues. Second, the cost issue.

▲ Defoaming masterbatch

At present, there are many manufacturers of antifoaming masterbatches, and the prices and quality are uneven, and their prices are roughly around 3,000 to 6,000. The choice is facing a dilemma, the price is cheap, the effect of removing water is poor, and it is easy to block the net; the quality is good and the price is relatively high. To solve this problem, the method of directly adding calcium oxide during processing was adopted to eliminate the water contained in carbon black, inorganic powder and recycled materials, and an ideal result was obtained.

Ruize is dedicated to the research, development and production of high-quality chemical fiber masterbatches, and the quality is guaranteed! Choose Ruize, colorful!

Yancheng Ruize Masterbatch Co., Ltd. mainly produces and operates: Non-woven masterbatch, Non-woven antibacterial masterbatch,antistatic masterbatch, polypropylene filament masterbatch, Polypropylene filament masterbatch, Non-woven masterbatch,  polypropylene spunbond non-woven masterbatch, Polypropylene fiber masterbatch, chemical masterbatch, Non-woven masterbatch, polypropylene masterbatch, Soft hydrophilic masterbatch.