Preparation method of low-smoke flame-retardant modified polyethylene foam material for automobile cavity

Abstract

The invention provides a preparation method of a low-smoke flame-retardant modified polyethylene foaming material for a cavity of an automobile. The method comprises the steps: firstly, preparing a foaming masterbatch by using a plastic mixer, that is, placing linear low density polyethylene resin and a nucleating agent into an internal mixer, adding levapren rubber and olefin elastomer resin to be internally mixed, then, internally mixing ethylene-propylene-diene rubber and butadiene rubber in the internal mixer, and finally, discharging to obtain the foaming masterbatch; and then, preparing a foaming material mixture by using an open mill, that is, mixing the foaming masterbatch, a foaming promoter, a crosslinking agent and a crosslinking promoter in the open mill, delivering the foaming material mixture into an extruder, and carrying out extrusion molding on the foaming material mixture to form a sheet, i.e., the low-smoke flame-retardant modified polyethylene foaming material for the cavity of the automobile. The foaming material has the height ratio of larger than or equal to 800% and the foaming ratio of over 3000% at the temperature of 140-180 DEG C, so that the expected excellent effects of low smoke, flame retardance and soft and hard-knot-free surface after foaming are achieved, and the environment friendliness and safety of the automobile are improved.

Description

Technical field

[0001] The invention relates to the preparation of foamed materials, in particular to a method for preparing low-smoke flame-retardant modified polyethylene foamed materials for automobile cavities. Background technique

[0002] With the vigorous development of the car industry, people are not only interested in intuitive visual experience such as the shape and color of the car, but also attach great importance to the comfort and safety that the car brings to us. One of the key points to measure comfort is It is very important to reduce the vibration and noise generated by the car during the driving process, so it is very important to reduce the cavity resonance generated by the car during driving and reduce the noise pollution caused by air circulation and vibration and friction inside the car cavity. In addition, attention must be paid to the flame retardancy of materials used in automobiles.

[0003] At present, the foaming materials for automobile cavities gene...