Low-warpage halogen-free flame retardant reinforced polyamide composite material

Abstract

The invention discloses a low-warpage halogen-free flame retardant reinforced polyamide composite material, which comprises the following components by weight: 15-40% of resin substances, 5-15% of halogen-free flame retardants, 50-70% of filling reinforcing agents, 5-10% of other additives. The preparation comprises the following steps: weighing the raw materials according to the weight ratios, well mixing the resin substance and other additives in a high-speed mixer, pouring the premix into a main hopper of a twin-screw extruder for charging; performing extrusion by the twin-screw extruder, performing granulation to obtain the low-warpage halogen-free flame retardant reinforced semi-aromatic polyamide composite material. The advantages of the invention are that: 1. with the introduction of milled glass fiber, the composition has lower warpage, low water absorption, good surface, and excellent processing forming and mechanical properties; 2. the addition of free-flow fluorine polymer can improve the melt fracture phenomenon during the processing process, and with the combination with milled glass fiber, the particle appearance of the material can be improved.

Description

technical field [0001] The invention relates to a polyamide composition, in particular to a high-filling low-warpage halogen-free flame-retardant reinforced polyamide composite material and a preparation method thereof. Background technique [0002] Polyamide resin, also known as nylon, has excellent mechanical properties, and it has a series of advantages such as fast molding, good fluidity, and good chemical corrosion resistance. It is often used in automobiles, electronic and electrical components, and electric tool casings. . In the aforementioned fields, certain specific applications also require polyamide compositions to be flame retardant. However, the use of halogen flame retardants has a series of disadvantages, usually resulting in poor apparent quality, especially at the processing temperature of high-temperature resistant polyamides (such as 300 ° C), halogen flame retardants are easy to decompose or degrade, and the use of halogen flame retardants Combustible ...

AI Technical Summary

Problems solved by technology

[0006] Chinese patent CN 1771292A discloses a flame-retardant polyamide molding material, which uses phosphinate and bisphosphinate as flame retardants, and the addition of fibers and granular fillers or their combinations is 0-60% by weight , does not specifically mention or imply the use of shaped cross-section glass fibers and ground glass fibers; Chinese patent CN 1863873A also discloses a halogen-free flame-retardant molding material of a mixture of aliphatic and partially aromatic polyamides, in the form of fibers or particles Shape or its composition is added in an amount of 0-60% by weight, without special mention or hint of the use of shaped cross-section glass fibers and ground glass fibers

[0007] In addition, the processing technology of the low-warpage halogen-free flame retardant system reinforced with high glass fiber content, especially 70% by weight glass fiber, cannot be carried out