Effect of production process on matting powder

Effect of production process on matting powder

Ye Kuan, Chen Duo, Zhou Lei (Wuhan Yincai Technology Co., LTD.)

Abstract: This paper discusses the matting powder processed by the process of batching, pre-mixing, melting and mixing extrusion, cooling and tablet pressing, fine crushing, classification and sieving, packaging. Through the study and analysis of the characteristics of various processes, the influence of matting powder gloss is summarized.

I. Introduction

The China matting powder industry is currently in a stage of rapid development, characterized by strong market demand, continuous optimization of product structure, and enhanced technological innovation capabilities. In the coming years, with the deepening promotion of green manufacturing concepts and the continuous expansion of downstream application fields, the industry is expected to maintain a steady growth momentum and achieve greater breakthroughs in high-end and functional directions. However, this also imposes higher requirements on matting powder production. How to stabilize glossiness has become one of the key challenges. Below, we will conduct experiments on the impact of production processes on matting powder glossiness.

II. THE EXPERIMENTAL PART

2.1 Experimental materials

                                                                                                                                                Table 1

2.2 Experimental equipment

                                                                           Table II

2.3 Experimental method

2.3.1 Effect of different weights on gloss 

through formula in 2.1

                                                                                                                                  Table 3

This high-speed mixer is mainly driven by the bottom motor to drive the mixing paddle, and the side motor of the mixing cylinder drives the crusher to mix. When the weight of the mixed material increases, the dispersion effect of the mixed material becomes worse, and the gloss slightly increases.

2.3.2 Whether the addition of the matting agent at different positions in the mixing tank through formula 2.1 affects the gloss

Table 4

Due to the fine particle size and light of the matting agent, it is difficult to disperse. When the matting agent is respectively located in the bottom layer and upper layer, the gloss changes. Compared with formula 5, formula 4 and formula 6, the gloss increases by 3-5 degrees, indicating that when the matting agent is located in the middle layer during mixing, the gloss is lower.

2.3.3 Influence of different extrusion temperature, speed and screw on the varnish 

                                                                                                                                                            Table 5

                                                                              Table VI

                                                                              Table VII

As can be seen from Table 5, different extrusion temperatures have a great influence on the gloss of the polishing powder. The polishing agent is used to destroy the smoothness of the coating surface and form micro roughness to scatter light to achieve polishing. The increase of extrusion temperature improves the melting and mixing effect, and the polishing effect is also improved.

As shown in Table 6, adjusting the extruder's screw speed and feeding speed significantly affects the matting effect. When increasing the screw speed, the gloss of the matting powder decreases. Conversely, reducing the feeding speed also lowers the gloss. This is because the enhanced shear force within the screw barrel improves material mixing efficiency during melting, thereby reducing surface gloss.

It can be seen from the replacement of different screws in Table 7 that there are differences in mixing effects of different screws. The mixing effect of high gloss screw is better than that of wrinkle screw and sand pattern screw. The mixing effect is directly related to the gloss.

2.3.4 Influence of different baking temperatures on the matting powder

                                                                              Table VIII

As can be seen from Table 8, with the increase of baking temperature, the gloss decreases accordingly. The increase of temperature makes it cure quickly, making the surface of the coating film more rough.

III. CONCLUSIONS

This study investigates the primary factors affecting the gloss of matting powder through three key aspects: raw material blending, extrusion process parameters, and baking temperature. The analysis reveals that dispersion characteristics during material mixing fundamentally determine gloss stability. Crucially, extrusion conditions—including temperature, screw rotation speed, and screw model—significantly influence material melting and dispersion efficiency. Furthermore, baking temperature proves to be a critical factor in gloss control, as improved dispersion performance and elevated baking temperatures collectively contribute to reduced gloss levels.

 reference documentation 

[1] Nan Renzhi, Powder Coatings and Coating Technology [M]. Beijing: Chemical Industry Press, 2014.