What are the characteristics of reinforced nylon?
The glass fiber reinforced nylon industry is referred to as Pa+GF. The nylon has an amino group in its main chain. The amino groups have polarities and attract each other due to the action of hydrogen bonds. Therefore, nylon is easily crystallized and can be made into fibers of high strength. However, nylon has great water absorption, poor acid resistance, low dry and low temperature impact strength, and easy deformation after water absorption, which affects the dimensional stability of the product, and its application range is limited. Adding glass fiber to nylon, the mechanical properties of the blended materials test results show that with the increase of glass fiber content (within a certain range), the tensile strength and flexural strength of the material are greatly improved, and the shrinkage and water absorption of nylon are greatly increased. reduce.
The main varieties of reinforced nylon are reinforced nylon 6 and reinforced nylon 66, which are absolutely dominant.
Reinforced nylon is the most important engineering plastic, and its output ranks first among the five general engineering plastics.
Properties: Reinforced nylon is a tough horny translucent or milky white crystalline resin. As a reinforced plastic for engineering plastics, the molecular weight of nylon is generally 1.5 to 30,000. Reinforced nylon has high mechanical strength, high softening point, heat resistance, low friction coefficient, abrasion resistance, self-lubricating property, shock absorption and sound absorbing property, oil resistance, weak acid resistance, alkali resistance and general solvent, and good electrical insulation. Self-extinguishing, non-toxic, odorless, weather resistant, and poor dyeability. The disadvantage is that the water absorption is large, affecting the dimensional stability and electrical properties, and the fiber reinforcement can reduce the water absorption rate of the resin, so that it can work under high temperature and high humidity. Reinforced nylon has a very good affinity for fiberglass.
Reinforced materials can improve the performance of nylon. The reinforcing materials include glass fiber, asbestos fiber, carbon fiber, titanium metal, etc. Among them, glass fiber is the main material to improve the heat resistance, dimensional stability, rigidity and mechanical properties (tensile strength and Bending strength), especially the mechanical properties are improved, and it is a nylon engineering plastic with excellent performance.
use:
(1) Reinforced nylon is mainly used for synthetic fibers. Its most outstanding advantage is that it has higher wear resistance than all other fibers, 10 times higher wear resistance than cotton, 20 times higher than wool, and some polyamide is added to the blended fabric. Fiber can greatly improve its wear resistance; when stretched to 3-6%, the elastic recovery rate can reach 100%; it can withstand tens of thousands of times without breaking. The strength of the polyamide fiber is 1-2 times higher than that of cotton and 4-5 times higher than that of wool, which is 3 times that of viscose. However, the heat resistance and light resistance of the polyamide fiber are poor, and the retainability is not good, and the finished clothes are not as crisp as polyester. In addition, nylon 66 and nylon 6 used for clothing have the disadvantages of poor hygroscopicity and poor dyeability. For this reason, a new type of polyamide fiber, nylon-3 and nylon-4, has been developed, which is light in weight. It is considered to be promising because of its excellent crease resistance, good air permeability, and good durability, dyeability and heat setting.
(2) The product is widely used, it is a good material for plastic, steel, iron, copper and other metals. It is an important engineering plastic; cast nylon widely replaces the wear parts of mechanical equipment, instead of copper and alloy for wear resistance of equipment. Pieces. Suitable for making wear parts, transmission structural parts, household appliance parts, automobile manufacturing parts, screw rods to prevent mechanical parts, chemical machinery parts, chemical equipment. Such as turbines, gears, bearings, impellers, cranks, instrument panels, drive shafts, valves, blades, screw rods, high pressure washers, screws, nuts, seals, shuttles, sleeves, bushing connectors, etc., instead of copper and other metals.
(3) Because polyamide has non-toxicity, light weight, excellent mechanical strength, wear resistance and good corrosion resistance, it is widely used in the manufacture of bearings in machinery, chemical, instrumentation, automotive and other industries instead of metals such as copper. , gears, pump blades and other parts. The polyamide has a high strength after melt spinning into a yarn, and is mainly used as a synthetic fiber and can be used as a medical suture.
Used in a variety of medical and knitwear.
(4) It can be blended or purely spun into various medical and knitwear. Nylon filament yarn is mostly used in the knitting and silk industry, such as woven single stockings, elastic stockings and other wear-resistant nylon socks, nylon shawls, mosquito nets, nylon lace, elastic nylon outerwear, various nylon silk or interwoven silk products. Most of the nylon staple fibers are blended with wool or other chemical fiber wool products to make a variety of wear-resistant fabrics.
(5) In the industry, nylon is widely used in the manufacture of cords, industrial fabrics, cables, conveyor belts, tents, fishing nets, etc. It is mainly used as a parachute and other military fabrics in national defense.
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