Preparation method of self-lubricating MC nylon elastic band material

Abstract

The invention relates to a preparation method of a self-lubricating MC nylon elastic band material. The method comprises the following steps: (1) heating a centrifugal mold in a centrifugal machine; (2) putting the monomer into a reaction container, heating to completely melt the monomer, and vacuumizing; (3), adding a catalyst, and vacuumizing; (4) sequentially adding a lubricating agent, a reinforcing agent and a toughening agent, and vacuumizing; (5) adding an activating agent, quickly dissolving, quickly stirring, casting into the centrifugal mold obtained in the step (1), centrifuging, naturally cooling to room temperature, and taking out a pipe fitting in the mold; (6) putting the prepared pipe fitting into a silicone oil tank for heating treatment; and (7) heating the pipe fitting subjected to oil bath in a water bath to obtain the self-lubricating MC nylon elastic band material. The self-lubricating MC nylon cartridge belt material prepared by the method has good dimensional stability, low water absorption, excellent self-lubricating property and mechanical strength, can improve the sealing and air-tight performance at the moment of bore launching when being applied to a sliding cartridge belt, and plays an important role in the flight attitude stability of a cartridge body.

Description

technical field [0001] The invention relates to the fields of self-lubricating sliding seals and high-pressure gas shocks, in particular to a preparation method of self-lubricating MC nylon elastic belt material. Background technique [0002] The sliding belt is one of the key components of the rod-type projectile. It is widely used in rifled guns and smoothbore guns to stabilize the projectile. The belt is located between the projectile body and the gun barrel, and produces strong sliding friction with the barrel and the projectile in a short time. Its main functions are: 1. Seal and hold the gas to prevent the leakage of gas generated by the burning of gunpowder, improve the utilization efficiency of the powder energy, and obtain a higher muzzle velocity; The initial deflection of the projectile in the bore, after the projectile leaves the barrel, reduces the impact on the flight attitude of the projectile; 3. Reduce the friction and wear between the projectile and the ba...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that sodium hydroxide, as a catalyst for the anionic polymerization of caprolactam, will generate water molecules in the reaction process; at the same time, sodium hydroxide itself is easy to absorb water, which will easily cause the polymerization instability of the reaction process or the water molecules generated during the polymerization. It cannot be completely removed during the reaction process, resulting in insufficient polymerization degree, pores or even polymerization inhibition, which seriously affects the physical and mechanical strength and product stability of the sliding elastic belt.

In addition, the nylon elastic belt material prepared by using sodium hydroxide catalyst and toluene diisocyanate activator is prone to yellowing during storage, which leads to problems such as product performance degradation

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