Glass fiber reinforced polyamide composite material with high weld mark strength and preparation method thereof

Abstract

The invention discloses a glass fiber reinforced polyamide composite material with high weld mark strength, which comprises the following components in parts by weight: 100 parts of polyamide, 0.2-0.8part of a carboxyl compound, and 1-50 parts of glass fibers. The carboxyl compound is one or a combination of more of an aliphatic monocarboxylic acid compound with the 12-18 carbon atoms and / or an aliphatic dicarboxylic acid compound with the 12-18 carbon atoms. By adding a certain amount of the carboxyl compound into the glass fiber reinforced polyamide material, the intermolecular interactionforce at a weld mark can be improved, and the weld mark strength of the composite material is further improved.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a glass fiber reinforced polyamide composite material with high weld line strength and a preparation method thereof. Background technique [0002] After polyamide resin is reinforced with glass fiber, its strength, rigidity, impact strength and thermal deformation temperature can be greatly improved, so it is widely used in industries such as automobiles, building materials, electronic appliances, and home appliances. However, in the application process, it is often found that the position of the weld line of the reinforced polyamide injection molded part often becomes the damage initiation point of the part. This is because although the addition of glass fiber can greatly improve the strength of the material, it is difficult to improve the strength of the weld line. In general, the weld line strength of glass fiber reinforced polyamide is not higher than that of the m...

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Problems solved by technology

At the same time, the description does not explain the mechanism, it may be that the level of entanglement between resin molecules has been increased