Polyolefin foam material and preparation method thereof

Abstract

The invention relates to a polyolefin foam material and a preparation method thereof. The preparation method comprises the following steps: (a) weighing 80-120 parts by weight of polyolefin, 40-220 parts by weight of inorganic flame retardant, and 0-20 parts by weight of synergist Parts by weight, mixed and added to the extruder to melt and extrude to obtain a premix; (b) adding the premix to a single-screw extruder, extruding and foaming to obtain a polyolefin foam material; wherein, the single-screw extruder The extruder includes an upper-stage screw and a lower-stage screw connected in series. The temperature of the upper-stage screw is 140°C-230°C, the temperature of the lower-stage screw is 90°C-180°C, and the temperature of the extrusion die is 90°C-175°C. Inject supercritical carbon dioxide into 1 / 5-1 / 3 of the upper screw. The cell density of the obtained polyolefin foam material is 10 4 cell / cm 3 ~10 12 cell / cm 3 , The expansion ratio is 1.05-25. The preparation method improves the dispersion effect of the flame retardant, and the obtained polyolefin foam material has uniform cell structure, high expansion ratio, controllable orientation degree, and excellent flame retardancy and mechanical properties.

Description

technical field [0001] The invention relates to the technical field of polymer material preparation, in particular to a polyolefin foam material and a preparation method thereof. Background technique [0002] Polyolefin foamed materials are only composed of carbon and hydrogen elements, and are extremely flammable. Compared with unfoamed polyolefin materials, foamed polyolefin materials are easier to burn, so it is particularly important to perform flame retardant treatment on them. [0003] Compared with flame-retardant foaming materials such as polyurethane, polystyrene, and melamine, the flame-retardant treatment of polyolefin foaming materials started relatively late, and there are problems such as low expansion ratio, poor dispersion of flame retardants, and foaming materials. The defects such as uneven cell structure, poor mechanical properties, and low production phase rate, etc., are technically difficult, and so far there are few reports on related core technologies...

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Problems solved by technology

[0003] Compared with flame-retardant foaming materials such as polyurethane, polystyrene, and melamine, the flame-retardant treatment of polyolefin foaming materials started relatively late, and there are problems such as low expansion ratio, poor dispersion of flame retardants, and foaming materials. The cell structure is not uniform, the mechanical properties are poor, the production phase rate is low, etc., and the technology is difficult. So far, there are few reports on related core technologies at home and abroad.

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