Piezas deportivas de resina compuesta de fibra de carbono larga PA12 resistentes a altas temperaturas automotrices

PA12 Plástico

La poliamida (PA) se conoce comúnmente como nailon, y el nailon de cadena larga de carbono se refiere a la variedad de nailon con más de 10 metileno entre enlaces amida adyacentes en la cadena principal de moléculas grandes, como PA11, PA12, PA1010, PA1212, PA1012, etc.  El rendimiento de PA12 es similar al de PA11, pero debido a la escasez de aceite de ricino, la materia prima utilizada para producir PA11, todos los países están utilizando PA12 en lugar de PA11.

PA12 es nailon 12, también conocido como polidodecactam, polilauractama, es un nailon de cadena larga de carbono. El material base para su polimerización es el butadieno, un material termoplástico semicristalino-cristalino. El nailon 12 es el nailon de cadena de carbono larga más utilizado, además de la mayoría de las propiedades generales del nailon, baja absorción de agua y tiene una alta estabilidad dimensional, resistencia a altas temperaturas, resistencia a la corrosión, buena tenacidad, fácil procesamiento y otras ventajas. En comparación con PA11, otro material de nailon de cadena larga de carbono, el precio del butadieno, la materia prima de PA12, es solo un tercio del precio del aceite de ricino, la materia prima de PA11. Puede reemplazar PA11 y aplicarse en la mayoría de las escenas, y tiene una amplia gama de aplicaciones en tuberías de combustible de automóviles, mangueras de frenos de aire, cables submarinos, impresión 3D y muchos otros campos.

characteristic

In long chain nylon, compared with other nylon materials, PA12 has great advantages, such as the lowest water absorption rate, the lowest density, low melting point, impact resistance, friction resistance, low temperature resistance, fuel resistance, good dimensional stability, good anti-noise effect. PA12 has the properties of PA6, PA66 and polyolefin (PE, PP) at the same time, achieving the combination of lightweight and physical and chemical properties, and has advantages in performance. The following table shows the performance data:

Advantage

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. The table below shows the values obtained for nylon 12 and other plastics by Tabor disk tests.

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.

Application

PA12 es el nailon de cadena larga de carbono más utilizado. Además de tener la mayoría de las propiedades generales del nailon ordinario, tiene baja absorción de agua, alta estabilidad dimensional, resistencia a altas temperaturas, resistencia a la corrosión, buena tenacidad, fácil procesamiento y otras ventajas. En comparación con PA11, otro material de nailon de cadena larga de carbono, el precio del butadieno, la materia prima de PA12, es solo un tercio del precio del aceite de ricino, la materia prima de PA11. Puede reemplazar PA11 y aplicarse en la mayoría de las escenas, y tiene una amplia gama de aplicaciones en tuberías de combustible de automóviles, mangueras de frenos de aire, cables submarinos, impresión 3D y muchos otros campos.