Preparation method of special blow molding material for automobile plastic fuel tank resistant to environmental stress cracking

Abstract

The invention discloses a preparation method of an environment stress cracking resistant blow molding material special for an auto plastic fuel tank. The preparation method comprises the following steps: (1) under the condition that a diluent is always in a circulating state and in the presence of a catalyst, placing raw materials including ethylene and 1-hexene into a reaction vessel for reacting, wherein the reaction temperature is 94 to 100 DEG C, and the reaction is stopped when the melt flow rate of a reaction product reaches 5.3 to 6.5g / 10min and the density is 0.943 to 0.947kg / m<3>, so as to obtain ethylene hexene copolymerization polyethylene resin; (2) taking and uniformly mixing 99.50 to 99.80 parts of ethylene hexene copolymerization polyethylene resin, 0.05 to 0.35 part of antioxidant, 0.03 to 0.15 part of auxiliary antioxidant and 0.02 to 0.06 part of zinc stearate, then adding the same into a mixing mill for extrusion pelletization, and cooling particles in cooling water; the obtained blow molding material special for the auto plastic fuel tank has relatively high melt strength, excellent environment stress cracking resistance and creep resistance, and good chemical corrosion resistance, and is suitable for machine shaping of single-layer and multilayer auto plastic fuel tanks.

Description

technical field [0001] The invention belongs to the field of blow molding plastics, and in particular relates to a preparation method of a special blow molding material for automobile plastic fuel tanks resistant to environmental stress cracking. Background technique [0002] The plasticization of fuel tanks is an important direction of modern automobile plasticization. With the requirements of automobile lightweight and the continuous development of high-density polyethylene material properties, plastics are more and more widely used in automobiles, and the application of automobile plastics is even greater. It has become one of the symbols to measure the level of automobile production technology and the level of new material research and development. Compared with metal fuel tanks, automotive plastic fuel tanks are light in weight, can be integrally formed, have flexible shape design, good anti-seepage and corrosion resistance, simple production process, high efficiency an...

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Problems solved by technology

At present, due to the constraints of the production process, the domestic HDPE production equipment is difficult to produce the special blow molding materials for automobile plastic fuel tanks (referred to as special materials for automobile fuel tanks) that meet the requirements and can be applied to six-layer fuel tanks, and the special materials for automobile fuel tanks The safety performance requirements are high, and it needs to be tested by the safety performance certification of the automobile industry. The localization of automobile plastic fuel tanks has become a difficult problem to solve. The special materials for automobile fuel tanks have to rely on imports in large quantities. The raw materials are expensive and difficult to guarantee supply.

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