Formula of glass fiber-impregnated PA6 (nylon 6) with high weather-resistant property and high fluidity and preparation method thereof

Abstract

The invention relates to a formula of a glass fiber-impregnated PA6 (nylon 6) with high weather-resistant property and high fluidity and a preparation method thereof. The formula comprises the following components in parts by mass: 100 parts of PA6 resin (1), 0.5 to 1.6 parts of anti-ultraviolet aging additive (2), 0.5 to 1 part of antioxidant (3), 0.2 to 1.2 parts of flowing promoter (4), 2 to 10 parts of toughener (5), and 1 to 5 parts of compatilizer (6). The preparation method comprises the following steps of premixing the components according to a certain ratio; using a double/single-screw extruder to melt, mix and extrude into a die head, separating flow and impregnating, so as to obtain the glass fiber-impregnated PA6 with high weather-resistant property and high fluidity. The formula and the preparation method have the advantage that by combining hyperbranched end active functional groups and glass fiber, the interface bonding ability between polyolefin resin and glass fiber is enhanced, and the mechanical property is improved.

Description

technical field [0001] The invention relates to the technical field of plastic manufacturing, in particular to a high weather resistance and high flow glass fiber impregnated PA6 formula and a preparation method thereof. Background technique [0002] PA6, also known as PA6 or Nylon 6 in Chinese, is a semi-crystalline thermoplastic resin prepared by ring-opening polymerization of caprolactam. It has the most superior comprehensive properties, such as mechanical strength, rigidity, toughness, mechanical shock absorption and resistance. Abrasive, self-lubricating, also has good electrical insulation and solvent resistance, widely used in the manufacture of mechanical structural parts and maintainable parts. However, due to its own structural characteristics, it has strong water absorption, and the equilibrium water absorption rate can reach about 3.5%. It needs to be dried before high-temperature melting processing, otherwise its mechanical properties will be damaged; due to th...

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Problems solved by technology

[0004] However, on the one hand, due to the application in some specific fields, long-term exposure to sunlight puts forward higher requirements for anti-ultraviolet performance and thermo-oxidative aging performance, such as 500h UVA and UVB aging at 70°C and 1000h thermal aging at 140°C After oxygen aging, the retention rate of tensile strength properties must reach more than 80%. On the other hand, the existing PA6 materials have poor impregnation effect on glass fibers, which directly affects the mechanical properties of products; Additives modify it, although it improves the flow properties of polyolefins and improves their impregnation effect with glass fibers, but at the same time damages their mechanical properties

In addition, due to the strong hydrogen bonding of PA6, the melt viscosity is relatively large, and the wettability to glass fibers is average. The thickness of the unidirectional continuous glass fiber reinforced PA6 sheet prepared by the current technology is mainly distributed in 0.30-0.35mm, and the tensile properties are between 0.30 and 0.35 mm. 600-700MPa, which greatly limits its application

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