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Process method for preparing nylon 1212

A process method, nylon technology, applied in the field of nylon 1212, can solve the problems of complex and lengthy process flow, large energy consumption, etc., and achieve the effect of short process flow, low energy consumption and improved yield

Active Publication Date: 2013-01-02
SHANDONG DONGCHEN ENG PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Chinese invention patent 99108152.8 discloses a preparation method of nylon 1212. The preparation method uses dodecane dibasic acid as the main raw material and has the advantages of abundant sources and low price. However, the preparation method is too complicated and lengthy, and consumes a lot of energy. , while the yield of the preparation method still has room for improvement

Method used

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  • Process method for preparing nylon 1212

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Experimental program
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Effect test

Embodiment 1

[0016] The first step is to add 100kg of dodecanedibasic acid into the molten acid kettle with stirring, and heat the acid melting kettle to 170°C with heat transfer oil to completely melt the dodecanedioic acid; then open the ammonia valve , keep a certain flow of ammonia in the ammoniation kettle, suck the dodecane dibasic acid in the melting kettle into the reactor of the ammoniation kettle with vacuum, after the feeding is completed, turn on the heating rod of the ammoniation kettle to start heating, increase the Ammonia gas flow, within the first 4 hours, the ammonia gas flow is controlled at 20-100M 3 / hour, in 5-8 hours, the flow rate of ammonia gas is controlled at 5-20M 3 / hour, 9 ~ 12 hours ammonia flow control at 1 ~ 10M 3 / hour, when the reaction temperature rises to 350 ° C, then keep the reaction at this temperature for 2 to 5 hours, at this time the dodecane dibasic acid has basically been converted into thick dodecane dibasic nitrile, open the bottom of the...

Embodiment 2

[0020] In the first step, add 600kg of dodecanedibasic acid into the molten acid kettle with stirring, and heat the acid melting kettle to 165°C with heat transfer oil to completely melt the dodecanedioic acid; open the ammonia gas valve, Keep a certain flow rate of ammonia in the ammoniation kettle, suck the dodecane dibasic acid in the melting kettle into the reactor of the ammoniation kettle with vacuum, after the feeding is completed, turn on the heating rod of the ammoniation kettle to start heating, increase the amount of ammonia Gas flow, within the first 4 hours, the ammonia flow is controlled at 100-200M 3 / hour, in 5-8 hours, the flow rate of ammonia gas is controlled at 5-20M 3 / hour, 9 ~ 12 hours ammonia flow control at 1 ~ 10M 3 / hour, when the reaction temperature rises to 340 ° C, then keep the reaction at this temperature for 2 to 5 hours, at this time the dodecane dibasic acid has basically been converted into thick dodecane dibasic nitrile, open the botto...

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Abstract

The invention discloses a method for preparing nylon 1212, which comprises the following steps: firstly, distilling off fine dodecanedinitrile; secondly, distilling off fine 1,12-dodecanediamine, and making the 1,12-dodecanediamine into flaky solid in a flake making machine; and thirdly, synthesizing the nylon 1212, cooling the nylon 1212 and granulating the nylon 1212 to obtain nylon 1212 resin.The invention has the advantage that the process method requires a shorter process flow and lower energy consumption and has higher product yield compared with the conventional process method for preparing nylon 1212.

Description

technical field [0001] The invention relates to nylon 1212, in particular to a process for preparing nylon 1212. Background technique [0002] Nylon (Nylon), scientific name polyamide, is one of the five major engineering plastics. It has excellent mechanical and physical properties, wear resistance, self-lubricating properties, oil resistance and temperature resistance. It is the most widely used thermoplastic engineering plastic at home and abroad. In the world, nylon containing less than 10 (including 10) carbon chains is called short carbon chain nylon, mainly including nylon 6 and nylon 66, accounting for about 80% of the total nylon; nylon containing more than 10 carbon chains It is called long carbon chain nylon, mainly including nylon 11 and nylon 12, accounting for more than 10% of the total nylon output. [0003] The overall performance of long carbon chain nylon is superior to that of short carbon chain nylon. It is an important high-performance engineering plast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/06C08K13/02C08K3/32C08G69/28
CPCY02P20/129
Inventor 于福德张建斌张全福
Owner SHANDONG DONGCHEN ENG PLASTIC