Method for preparing pure product nylon 6 by taking nylon 6 waste material as raw material

Abstract

The invention relates to the technical field of plastic, and concretely discloses a method for preparing a pure product nylon 6 from nylon-6-containing waste material. The nylon 6 waste material comprises nylon 6 cloth material, nylon 6 rope material, nylon 6 plate material, nylon 6 rod material and all other product raw materials containing nylon 6. The method comprises the following steps: (1) crushing nylon 6 waste material to 1-2 cm; (2) adding a special-purpose catalyst and a solvent into an enclosed container, and stirring and dissolving under certain conditions; (3) filtering and separating solid in the solution after dissolving is finished; and (4) cooling and crystallizing nylon 6 in the solution at a certain temperature to form nylon 6 solid. The method is an effective method for preparing the pure product nylon 6 from nylon 6 waste material. The method is simple and reliable in technological process, and low in production cost. The quality of the prepared nylon 6 product reaches the quality of pure nylon 6 subjected to slicing and pelleting.

Description

technical field [0001] The invention relates to the technical field of plastics, in particular to a technique for preparing pure nylon 6 by using nylon 6 waste as a raw material. Background technique [0002] Nylon 6 is a thermoplastic polyamide polymer material with stable chemical properties, good mechanical properties and impact resistance. One of the most widely used materials, because a variety of additives must be added to the nylon 6 material used to improve the performance of nylon 6, and a large amount of leftovers and wastes are inevitably generated during the extensive use of nylon 6. In these leftovers and wastes Contains a variety of additives that are difficult to separate. At present, some of these nylon 6 wastes are used as raw materials for low-end nylon 6 products after simple sorting and granulation with a screw. Most of the nylon 6 scraps or wastes are used as fuel, resulting in waste of resources and environmental pollution. . In addition, since nylon...

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Problems solved by technology

At present, some of these nylon 6 wastes are used as raw materials for low-end nylon 6 products after simple sorting and granulation with a screw. Most of the nylon 6 scraps or wastes are used as fuel, resulting in waste of resources and environmental pollution.

In addition, since nylon 6 is difficult to dissolve in commonly used solvents, it is very difficult to purify nylon 6 from waste

[0003] Xia Xiaoli and others carried out "Experimental Research on the Dissolution of Nylon 6 in 1-Ethyl-3-Methylimidazolium Bromide Salt". In this paper, ionic liquid was used to dissolve and purify nylon 6, but the dissolution temperature in this method was 180°C , the mass ratio of nylon 6 to ionic liquid is 6.25%, the purification ability is very low, the cost is high, and it cannot be used in industrial production

[0004] Other literature reports are more about using catalysts and solvents to depolymerize nylon 6 into monomer compounds and then recycling them, or crushing nylon 6 and adding it to building materials for use. These methods cannot directly regenerate nylon 6 However, the technology of using nylon 6 waste to prepare pure nylon 6 has not been reported.