PA6 composite material special for engine air intake manifolds

Abstract

The invention discloses a PA6 composite material special for engine air intake manifolds. The PA6 composite material comprises the following raw materials by weight: 60-70 parts of PA6 resin, 25-35 parts of glass fiber, 0.5-1 part of a dispersant, 4-5 parts of a compatibilizer, 0.5-1 part of a coupling agent, 1-2 parts of carbon black, and 1-2 parts of an antioxidant, and is prepared by: mixing the raw materials by a high-speed mixer, then conducting mixing milling by a millstone type mixing device, and carrying out parallel twin-screw extrusion granulation. The glass fiber is high strength glass fiber with a monofilament diameter of 8micrometer, the compatibilizer is formed by compounding of a maleic anhydride grafted butane-octene copolymer and N, N'-ethylene bis stearamide in a weight ratio of 3:1. The PA6 composite material special for engine air intake manifolds has good secondary fusion welding bondability and high strength after welding. The engine air intake manifolds preparedfrom the PA6 composite material special for engine air intake manifolds have the advantages of high integral strength, good toughness, little glass fiber exposure, strong blast resistance ability in awelded rib area and the like.

Description

technical field [0001] The invention relates to a PA6 composite material, in particular to a PA6 composite material specially used for producing engine intake manifolds. Background technique [0002] The engine plastic intake manifold is directly connected to the engine cylinder head, and the working temperature is from -40°C to 140°C. In addition, the intake manifold also bears engine vibration load, throttle body inertial force load, and intake pressure pulsation load. In the case of abnormal backfire of the engine, the high-pressure gas in the power stroke flows back into the intake manifold, causing the pressure in the inner cavity of the intake manifold to rise sharply, and it will reach a peak of several or even a dozen atmospheres in an instant. For this reason, the burst pressure of the plastic intake manifold must be greater than the peak pressure, so as to ensure that it will not be damaged under abnormal conditions, which will affect the safety of users. The pla...

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Problems solved by technology

For this reason, the burst pressure of the plastic intake manifold must be greater than the peak pressure, so as to ensure that it will not be damaged under abnormal conditions and affect the safety of users.

The plastic intake manifold is made of glass fiber reinforced nylon. The glass fiber reinforced nylon in the prior art is mostly made of glass fiber with a single diameter of about 13 μm and nylon by kneading and kneading. Using this glass fiber reinforced nylon During the production of the plastic intake manifold, when the upper shell and the lower shell are connected together by vibration friction welding, the material in the welding rib area will be melted again through friction and heat, and the glass fiber will be formed during the friction process. A large number of fractures are exposed from the nylon, thereby affecting the strength of the welded rib area, resulting in a much lower blast resistance in the welded rib area than in the non-welded area, and the burst strength of the welded rib area can only reach 80% of the non-welded area

Therefore, when the plastic intake manifold is used for a long time, the welded rib area has insufficient anti-knock ability, and it is easy to be damaged along the welded rib area when the engine is tempered.

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