Optimization method for preparation technology of biodegradable color masterbatch with high covering property

Abstract

The invention belongs to the field of plastic coloring, and provides an optimization method for preparation of a full-biodegradable color masterbatch with high covering property. The method comprisesthe steps: biodegradable resin, a plasticizer and a pigment are put into twin screws and are granulated, temperature sensors are arranged at all areas of the extruder screws, technological parametersin the processing process are automatically collected, a response surface analysis method is adopted, a ternary quadratic regression orthogonal rotation experiment is applied to preparation technologyanalysis, the covering property is characterized by the light transmittance rate, and the regression equation is used for simulating the influence of various technological conditions (the plasticizerratio, the screw rotating speed and the temperature) on the covering property in the twin screw processing process; then the factors affecting the covering property in the process of extrusion granulation of the biodegradable color masterbatch are rapidly and conveniently obtained; next, the processing conditions can be controlled according to the influence degree to obtain the corresponding color masterbatch which conforms to the covering property condition; and finally, the best technological parameters of the biodegradable color masterbatch with high covering property can be obtained quickly in the preparation process of the biodegradable color masterbatch.

Description

technical field [0001] The invention belongs to the field of plastic coloring, and in particular relates to an optimization method for the preparation process of high-covering biodegradable color masterbatches. technical background [0002] Plastic has become the most widely used material in the world. With the scarcity of global petroleum resources and the intensification of white pollution caused by the use of plastics, biodegradable plastics have become green and sustainable new materials that have begun to enter the market and replace traditional petroleum-based plastics. To alleviate resource scarcity and white pollution. [0003] As biodegradable plastic products enter the market, in order to meet the usability of biodegradable plastic products, biodegradable plastic products must be colored, and color masterbatches are bound to be used. Color masterbatches are also called pigment concentrates. Composed of carrier resin and additives, the production of high-concentrat...

AI Technical Summary

Problems solved by technology

[0003] As biodegradable plastic products enter the market, in order to meet the usability of biodegradable plastic products, biodegradable plastic products must be colored, and color masterbatches are bound to be used. Color masterbatches are also called pigment concentrates. Composed of carrier resin and additives, the production of high-concentration color masterbatches is the most popular in recent years, but due to the addition of a large amount of toner to high-concentration color masterbatches, it is difficult for polymer macromolecules to move, and the melt viscosity is greatly increased, which brings difficulties to processing. It is difficult to obtain a masterbatch with high covering property

[0004] At present, CN102040817, CN101475695, and CN102746629 have all reported the preparation method of polylactic acid color masterbatch, and it is mainly mixed in mixer by polylactic acid, auxiliary agent, pigment according to formula ratio, then with the mixture obtained in screw extruder Melt blending and granulation to obtain color masterbatches, but they have added petroleum-based polymers such as polyethylene wax, paraffin wax, and EBS to the auxiliary agents, which greatly reduces the biodegradability of PLA materials. CN102040814 discloses existing The carrier material of black masterbatch has poor compatibility with polylactic acid, which affects the mechanical properties of polylactic acid-based materials and the dispersibility of pigments, which in turn affects its coloring effect and hiding properties

[0005] In the patents CN102391626 and CN104151800, the preparation method of fully biodegradable polylactic acid color masterbatch is disclosed. After mixing auxiliary agents, biodegradable resins and fillers, they are added to a twin-screw extruder for melting and granulation. The auxiliary agents are all Biodegradable materials such as urea, aluminate, etc. are used, and the fillers are biological materials such as starch and protein powder, but the influence of additives on the application performance of its covering properties and the influence of process conditions on its covering properties are not explained

At present, there is no report on the process impact of plasticizers on the hiding properties of biodegradable masterbatches

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