Production of super-toughened fire-retardant composite modified nylon mother material

Abstract

Production of composite fire-retardant and ultra-toughed modified Nylon base material is carried out by preparing Nylon compatible toughening agent, weighing maleic anhydride, bis-penta vulcanizing agent and grafting accessory proportionally, adding into diluting agent, agitating, cooling to normal temperature to prepare into mixed liquid, extruding for multi-polymer of ethane-octylene, poly-propylene and mixed liquid by bi-screw extruder, granulating to obtain Nylon compatible toughening agent, extruding for multi-polymer of ethane-octylene, fire-retardant agent, dispersant, antioxidant and processing accessory, and granulating to obtain final product. It's convenient, cheap, fast and efficient and saves resources.

Description

technical field [0001] The invention relates to the technical field of modification of nylon materials. This masterbatch has dual functions of flame retardancy and super toughness. After mixing it with pure nylon evenly in proportion, it can directly produce flame-retardant super-tough nylon products, so that nylon can avoid secondary The degradation effect caused by secondary processing is more widely applicable to the use of automobiles, electrical appliances and other components that require flame retardancy, weather resistance, and low temperature resistance. Background technique [0002] Nylon PA has the advantages of toughness, wear resistance, oil resistance and chemical stability. Wait, it is one of the most widely used and sold among the five major engineering plastics. However, the disadvantages are that the general grade of nylon PA has a large water absorption rate, and the difference in dry and wet properties varies greatly, especially in low temperature enviro...

AI Technical Summary

Problems solved by technology

However, the disadvantages are that the general grade of nylon PA has a large water absorption rate, and the difference in dry and wet properties varies greatly, especially in low temperature environments. The impact strength is low, and the notch sensitivity is strong, and the dimensional stability is poor.

We know that in order to be flame retardant, flame retardants need to be added to nylon PA, and the addition of flame retardants will affect the toughness of nylon PA. In order to increase the toughness, it is necessary to add elastomers such as POE and EPDM to nylon PA. , ESBS, EVA or MAS, however, the addition of toughness additives will also affect the flame retardancy of the PA system

In particular, the toughening and flame retardant modification of nylon PA requires repeated melting, which will cause defects such as high energy consumption, nylon degradation and decomposition, high cost, and some performance degradation, which is also very unreasonable.

[0004] Although there are some technical reports on flame retardant and toughening modification of nylon PA, such as "The Development of Tough Flame Retardant Nylon-6" (Plastic Science and Technology, 1997, 6: 51-53), its process includes: elastomer -g-MAH grafting process to obtain elastomer, weigh nylon 6 resin, decabromodiphenyl ether, antimony trioxide, grafted elastomer, antioxidant 1010, white oil in a certain proportion, and mix at a certain temperature at a high speed Machine mixing, put into the oven and bake for 8 hours. The oven temperature is controlled at 90-100°C, and then extruded in the twin-screw machine. After cooling, it is dragged and pelletized to obtain tough flame-retardant nylon-6. The defect lies in the production When making finished products, it is necessary to re-dry the materials and other processes. For nylon, it may cause the possibility of two processing degradation.

If the elastomer adopts POE elastomer, when the grafting rate is low and the proportion of POE is large, it is easy to cause delamination between PA and POE system, which will directly affect the performance of modified nylon.

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