Foam master batch for microcellular polystyrene foam material, and its preparation method

Abstract

The invention discloses a foam master batch for a microcellular polystyrene foam material, and its preparation method. The foam master batch comprises, by weight, 10-80 parts of low molecular weight polystyrene carrier, 5-40 parts of bicarbonate, 5-40 parts of azobisformamide, 1-5 parts of organic carboxylic acid, 1-5 parts of zinc oxide, 0.1-2 parts of a coupling agent and 0.1-2 parts of white oil. The preparation method comprises the following steps: 1, mixing the above components through a high-speed mixing process for 10-30 min to full uniformity; and 2, carrying out shearing, fusion and dispersion plasticizing on the mixture obtained in step 1 through a double screw melting extruder, and carrying out extrusion granulation to prepare the foam master batch. The foam master batch has the advantages of good dispersibility and slow decomposition in the polystyrene microcellular foaming process, and products obtained by using the foam master batch have the advantages of compact cell, good comprehensive mechanical properties, high size precision and the like.

Description

technical field [0001] The invention relates to a foaming masterbatch and a preparation method thereof, in particular to a foaming masterbatch used for polystyrene microcellular foaming materials and a preparation method thereof. technical background [0002] Polystyrene microcellular foaming material has a series of advantages such as light weight, low price, insect resistance, moth resistance, moisture resistance, non-toxic environmental protection, long service life, etc. There are many kinds of foaming agents used in this field at present. The heat can be divided into exothermic foaming agents and endothermic foaming agents. The exothermic foaming agents include azodicarbonamide, disubunit pentamethylenediamine and sulfonyl hydrazide and other foaming agents. , its foaming efficiency is high, but its decomposition rate is relatively fast, it is difficult to control, and it is easy to cause the core layer of the material to burn; the endothermic foaming agent is mainly bi...

AI Technical Summary

Problems solved by technology

[0002] Polystyrene microcellular foaming material has a series of advantages such as light weight, low price, insect resistance, moth resistance, moisture resistance, non-toxic environmental protection, long service life, etc. There are many kinds of foaming agents used in this field at present. The heat can be divided into exothermic foaming agents and endothermic foaming agents. The exothermic foaming agents include azodicarbonamide, disubunit pentamethylenediamine and sulfonyl hydrazide and other foaming agents. , its foaming efficiency is high, but its decomposition rate is relatively fast, it is difficult to control, and it is easy to cause the core layer of the material to burn; the endothermic foaming agent is mainly bicarbonate, usually an inorganic foaming agent

The endothermic property of bicarbonate foaming agent decomposition is beneficial to the foaming process, especially for extrusion foaming. The endothermic property of the decomposition of the foaming agent can avoid the collapse of foam and other products caused by the heat release of the organic foaming agent. Quality problems are very beneficial to stabilize product quality and avoid foam scorching. However, it is difficult to obtain high-quality foam by using bicarbonate as a foaming agent. The formed cells are relatively thick and the cell structure is uneven. , which is mainly caused by the poor dispersion of bicarbonates in polymer materials. At present, combined with the respective advantages of exothermic foaming agents and endothermic foaming agents, a composite foam with better performance of endothermic and endothermic balance has been developed. However, such foaming agents often have problems such as stringing and parallel foaming during the molding process, most of which are caused by poor dispersion of the foaming agent