일반적으로 polydodecactam, PA12로 알려진 나일론 12 화학 물질.

긴 탄소 사슬 나일론은 나일론 분자의 주 사슬 반복 단위에 아미드 그룹이 있는 나일론이며 두 아미드 그룹 사이의 메틸렌 길이는 10보다 큽니다. 우리는 나일론 11, 나일론 12, 등. PA12는 폴리도데카탐, 폴리라우락탐으로도 알려진 나일론 12이며 긴 탄소 사슬 나일론입니다. 중합을 위한 기본 재료는 반결정질-결정질 열가소성 재료인 부타디엔입니다. 나일론 12는 가장 널리 사용되는 긴 탄소 사슬 나일론으로 나일론의 일반적인 특성, 낮은 수분 흡수성 외에도 높은 치수 안정성, 고온 저항성, 내식성, 우수한 인성, 쉬운 가공 및 기타 장점을 가지고 있습니다. 또 다른 긴 탄소 사슬 나일론 소재인 PA11과 비교할 때 PA12의 원료인 부타디엔 가격은 PA11의 원료인 피마자유 가격의 1/3에 불과합니다. PA11을 대체할 수 있으며 대부분의 장면에 적용할 수 있으며 자동차 연료 파이프, 에어 브레이크 호스, 해저 케이블, 3D 프린팅 및 기타 여러 분야에서 광범위한 응용 분야를 보유하고 있습니다. 긴 사슬 나일론에서 다른 나일론 소재와 비교하여 PA12는 가장 낮은 흡수율, 가장 낮은 밀도, 낮은 융점, 내 충격성, 내 마찰성, 저온 저항성, 연료 저항성, 우수한 치수 안정성과 같은 큰 이점을 가지고 있습니다. 노이즈 방지 효과. PA12는 PA6, PA66 및 폴리올레핀(PE, PP)의 특성을 동시에 가지고 있어 경량성과 물리적, 화학적 특성의 조합을 이루며 성능면에서도 장점이 있습니다. There are a large number of non-polar methylene groups in nylon 12, which makes nylon 12 molecular chain more compliant. The amide group in nylon 12 is polar, and the cohesion energy is very large, it can form hydrogen bonds between the molecules, so that the molecular arrangement is regular. Therefore, nylon 12 has high crystallinity and high strength. Nylon 12 has low water absorption, good low temperature resistance, good air tightness, excellent alkali and oil resistance, medium resistance to alcohol, inorganic dilute acid and aromatic hydrocarbons, good mechanical and electrical properties, and is a self-flameout material. 1) Density The relative density of nylon 12 is only 1.01-1.03, which is the smallest among all engineering plastics, which has a certain effect on reducing the quality of vehicles and reducing fuel consumption. When compared by unit volume, nylon 12 has advantages in price and performance. 2) Melting point The melting point of nylon 12 is 172-178℃, slightly lower than nylon 11, can fully meet the requirements of automobile fuel pipe and brake pipe working environment temperature. 3) Water absorption As we all know, the biggest disadvantage of nylon products is large water absorption, dimensional stability is difficult to ensure. And PA12 has the lowest water absorption rate of nylon products, this is due to the methylene molecules in nylon 12 greatly reduce the hydrophilic groups, which makes nylon 12 has a great advantage. 4) Impact strength Impact strength is an important technical index, especially for nylon 12 pipe often exposed to air. Nylon 12 under -20℃ and -40℃ according to the standard test, no fracture phenomenon, fully meet the requirements of use. Nylon 12 has excellent impact resistance. 5) Low temperature performance Nylon 12 has the lowest brittleness temperature of -70 degrees Celsius, so it can be widely used in low-temperature resistant parts. 6) Flexibility The influence of plasticizer on the physical properties of nylon 12 is concentrated on the elastic modulus of resin. Nylon 12 has three basic types of resin, their main difference is due to the plasticizer content of different forms of flexibility. The elastic modulus of resin decreases with the increase of extractable component content of plasticizer. 7) Low wear and low friction performance Nylon 12 has excellent low abrasion and low friction properties and self lubricating properties, so the friction noise of nylon 12 products is very low. 8) Fuel resistance In automobiles, the mixture of oxygenated fuel, high aromatic fuel and alcohol currently used can cause the breakdown of many hose materials. After the test, only nylon 11, nylon 12 and fluorocarbon resin elastomers can be used in this environment. Almost other types of nylon melt under the action of automobile fuel, resulting in a change in size. 9) Resistance to zinc chloride solution Zinc chloride is found under the car. Under certain temperature and humidity, the salt on the road reacts with galvanized steel plate or zinc-containing primer to form the corrosive zinc chloride. In addition, ozone aging, ultraviolet radiation, temperature conditions and so on, will bring different degrees of damage to the parts, reduce the service life. Nylon 12 is very resistant to zinc chloride solution. Because there is no unsaturated double bond in nylon 12 which is susceptible to ozone attack, ozone aging does not occur. In addition, Nylon 12 UV resistance is also excellent. 10) Excellent electrical performance The long carbon chain structure of nylon gives it excellent electrical properties. Because of the low water absorption of long carbon chain nylon, it still has excellent dielectric properties in the humid environment, which is not possessed by short carbon chain nylon such as nylon 6 and nylon 66. PA12 is the most widely used long carbon chain nylon. In addition to having most of the general properties of ordinary nylon, it has low water absorption, high dimensional stability, high temperature resistance, corrosion resistance, good toughness, easy processing and other advantages. Compared with PA11, another long carbon chain nylon material, the price of butadiene, the raw material of PA12, is only one third of the price of castor oil, the r...

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