Hydrolysis-resistant alcoholysis-resistant nylon 66 composite material and preparation method thereof

Abstract

The invention provides a hydrolysis-resistant alcoholysis-resistant nylon 66 composite material and a preparation method thereof. The hydrolysis-resistant alcoholysis-resistant nylon 66 composite material is characterized by comprising the following ingredients in parts by weight: 51.8 to 84.5 parts of nylon resin, 15 to 40 parts of short-cut glass fibers, 0.1 to 0.6 parts of nucleating agent, 0.1 to 0.6 parts of thermal stabilizer, 0.1 to 1.0 part of alcoholysis-resistant auxiliary agent, 0.1 to 5 parts of barrier material and 0.1 to 1.0 part of lubricant. The manufacturing method comprises the following steps that: the nylon 66 resin, antioxidant, hydrolysis-resistant agent, the barrier material, the nucleating agent and the lubricant, which are previously dried, are uniformly mixed at a high speed; and the mixture and the glass fiber are fed into a double-screw extruder to be extruded and pelleted. The hydrolysis-resistant alcoholysis-resistant nylon 66 composite material not only has good high temperature resistance and high thermal oxidation aging resistance, but also has excellent property for resisting the corrosion of glycol and solution thereof, and can completely satisfy the requirements on manufacturing components such as car heat radiator cooling water tanks, thermostats and charge air coolers.

Description

technical field [0001] The invention relates to a hydrolysis and alcoholysis-resistant nylon 66 composite material, which belongs to the technical field of modified polyamides. Background technique [0002] Nylon 66 (PA66) contains strong polar amide groups (-CONH-) in its molecular chain, and the hydrogen bonds formed between the groups make the structure of PA66 easy to crystallize, so that the material has excellent mechanical properties and is naturally Lubricity, wide operating temperature, good electrical insulation, oil resistance, good chemical stability, easy processing, etc., so it is widely used in various fields of national economy, such as auto parts, high-speed railway fasteners, gears, automatic printers Various high-load mechanical parts such as cams. The disadvantages are poor dimensional stability, high water absorption and other factors that make the product unable to meet the requirements of high-precision processing, which can be improved by modificatio...

AI Technical Summary

Problems solved by technology

The disadvantage is that the dimensional stability is poor, the water absorption rate is high and other factors make the product unable to meet the requirements of high-precision processing, which can be improved by modification methods such as reinforcement and filling.

There are also domestic manufacturers who have made glass fiber reinforced nylon 66 materials for radiator water tank materials, but the physical properties of the products cannot meet the technical requirements of the Volkswagen TL52062 standard (that is, at a constant temperature of 135 ° C, after 48 hours in 100% ethylene glycol solution , the product surface has no change, no cracking), and the technical requirements of General Motors GMW15468 (that is, at a constant temperature of 130 ° C, after 1000 hours of corrosion by the coolant compounded with ethylene glycol and water in a volume ratio of 1:1, the product surface has no change, no Cracking), the main problem is that the material or parts are cracked or the physical properties are severely attenuated after being corroded by the coolant.

[0004] Patent CN101191015A discloses a special nylon 66 (PA66) material that can be used to manufacture automobile radiator water tank parts. PA66 is used as the base material, and a combination of glass fiber, cuprous halide, methyl halide, sodium phenyl hypophosphite and calcium fluoride is added. The addition of calcium salt will easily destroy the intermolecular hydrogen bond of PA66, reduce the crystallinity of the material, lead to a decrease in the density of the material, and greatly reduce the ability to resist alcoholysis.

Patent CN 101613527A prepares alcoholysis-resistant nylon 66 for automobile water tanks. The ethylene bisfatty acid amide (EBS) used in this patent is easy to decompose under the processing temperature window of nylon 66, which leads to a low content of small molecules in the material production and molding process. High, more gas, etc., parts are prone to poor appearance, etc. Patent CN 101760020A discloses a glass fiber reinforced nylon 66 material for preparing automobile radiators. The antioxidants 1098 and 168 used in the patent have limited antioxidant effects , the two are used alone or in combination, and their thermal stability cannot meet the requirements of long-term use at high temperatures. In addition, EPDM rubber is used as a compatibilizer in the patent, although it can improve the toughness of the material, but due to the three The corrosion resistance of ethylene propylene rubber itself is weak, which leads to the decline of the corrosion resistance of the material as a whole

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