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Preparation method of nylon

A technology of nylon and nylon salt, which is applied in the field of polymer material synthesis, can solve problems such as difficult to obtain high molecular weight nylon 56, unbalanced ratio of pentamethylenediamine and adipic acid, difficult to obtain high molecular weight nylon, etc., to improve equipment utilization rate, shorten the polymerization cycle, and reduce the effect of polymerization energy consumption

Active Publication Date: 2014-08-13
CATHAY R&D CENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been verified by the inventor's experiments that it is difficult to prepare nylon 56 with a higher molecular weight polymer by using the traditional nylon 66 polymerization process. This is due to the loss of pentamethylenediamine with the evaporation of water vapor during the polymerization process. , which eventually leads to an imbalance in the ratio of pentamethylenediamine to adipic acid, making it difficult to obtain high molecular weight nylon 56 in subsequent polymerization
Due to the unbalanced ratio of amino-terminated and carboxyl-terminated nylon 56 slices, it is difficult to obtain high-molecular-weight nylon even through solid-state polymerization in the later stage, which greatly limits the application field of nylon 56.
In order to overcome this shortcoming, the literature is to realize the equivalent of 1,5-diaminopentane and adipic acid in the polymerization process by increasing the pH value, that is, increasing the amount of 1,5-diaminopentane added, which will inevitably cause an increase in cost. Excess 1,5-diaminopentane will cause environmental pollution if discharged into the atmosphere

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The 50-liter enamel salt-forming kettle was vacuumed and filled with nitrogen to replace the air three times, and protected with nitrogen. Added 20kg of pure water to the salt-forming kettle, and then added 12.41kg of Shandong Kaisai pentamethylenediamine (gas-phase normalization method purity 99.56%), start stirring, add 17.64 kg of superior grade adipic acid from Liaoning Petrochemical, and then add 6 g of antioxidant Bruggolen H10 (Bruggolen H 10, produced by Bruggolen, Germany) to prepare a nylon salt solution. Replace the air in 100 liters of K / SY166-2007 polymerization kettle with nitrogen, and transfer the nylon salt solution to the polymerization kettle. The temperature of the oil bath will rise to 1.73MPa when the pressure inside the kettle is raised, and then start to exhaust and keep the pressure and continue heating to 240 ℃, and then continue to heat and lower the pressure to normal pressure. When the pressure in the kettle reaches 265 ℃, evacuate to 0.06Mpa...

Embodiment 2

[0067] Operate in the same manner as in Example 1 except that the amount of water added in Example 1 is adjusted to 12.8 kg. The resulting nylon resin was tested for viscosity, and the results are shown in Table 3.

Embodiment 3

[0069] Operate in the same manner as in Example 1 except that the amount of water added in Example 1 is adjusted to 7.5 kg. The resulting nylon resin was tested for viscosity, and the results are shown in Table 3.

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PUM

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Abstract

The present invention relates to a low-cost low-pollution preparation method of nylon, and the method is realized by the means of using a high concentration means to effectively suppress pentane diamine volatilization on the basis of inherent characteristics of pentane diamine nylon salt. According to the preparation method, the pentane diamine volatilization in the polymerization process can be reduced, the cost can be saved, the pollution can be reduced, the polymerization cycle can be shortened, the equipment utilization can be improved, the polymerization energy consumption can be reduced, the nylon suitable for different uses can be prepared, and at the same time, the method is also applicable to nylon continuous polymerization.

Description

technical field [0001] The invention belongs to the technical field of polymer material synthesis and relates to a preparation method of nylon. Specifically, the present invention relates to a method for preparing nylon using pentamethylenediamine as a raw material. Background technique [0002] Nylon is excellent in mechanical strength, heat resistance, and chemical resistance, and is used in many fields as one of so-called engineering plastics. However, the raw materials of traditional plastics such as nylon are mostly naphtha, the so-called petrochemical raw material. In addition to recycling, discarded plastics are often disposed of by burning, which leads to carbon dioxide emissions and causes problems such as global warming. [0003] For a long time, people have expected to use plant resources that grow by absorbing carbon dioxide from the air as raw materials, and then carbon dioxide can be recycled to suppress global warming and solve the problem of resource deplet...

Claims

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Application Information

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IPC IPC(8): C08G69/28C08L77/06
Inventor 郑毅刘驰秦兵兵李乃强
Owner CATHAY R&D CENT CO LTD
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