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Preparation method of long-carbon-chain nylon and obtained nylon

A long carbon chain, nylon technology, applied in the field of polymer materials, can solve the problems of long carbon chain nylon with less polymer filler, unstable polymerization, easy to be oxidized, etc. long time effect

Pending Publication Date: 2022-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems existing in the prior art, the present invention provides a preparation method of long carbon chain nylon, by increasing the water in the batching and adjusting the prepolymerization process to solve the problem of too little filler for long carbon chain nylon polymerization, unstable polymerization, easy problems such as oxidation

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  • Preparation method of long-carbon-chain nylon and obtained nylon
  • Preparation method of long-carbon-chain nylon and obtained nylon

Examples

Experimental program
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Effect test

Embodiment 1

[0073] Nylon salt formation: (1) Add 900.5g of dodecanedibasic acid and 4500g of ethanol into the neutralization kettle, heat to 75°C to dissolve, and keep for 30 minutes; (2) Add 783.5g of dodecanediamine Add 1000% ethanol into the dissolution tank, heat to 60°C to dissolve, and keep for 30 minutes; (3) Put all the dodecyl diamine ethanol solution into the neutralization tank through the pump, react while stirring, and control the reaction temperature At 78°C, continue to react for 1.0 hour after adding the materials, cool the neutralization tank to lower the temperature below 30°C, filter the neutralization solution through a filter, and dry in a drying oven to obtain nylon 1212 salt;

[0074] Polymerization of Nylon 1212: (1) Mix 600g of nylon 1212 salt with 600g of water, catalyst, molecular weight regulator, antioxidant, etc., and then add it to a 2.0L high-temperature and high-pressure polymerization kettle. The catalyst is sodium hypophosphite, and the molecular weight r...

Embodiment 2

[0076] Nylon salt-forming steps are the same as in Example 1.

[0077] Polymerization of Nylon 1212: (1) Mix 600g of Nylon 1212 salt with 900g of water, catalyst, molecular weight regulator, antioxidant, etc., and then add it to a 2.0L high-temperature and high-pressure polymerization kettle. Among them, sodium hypophosphite is selected as the catalyst, and laurel is selected as the molecular weight regulator. Acid and antioxidant select antioxidant 1098, the addition amount is 0.1wt%; (2) heat up to 210°C for 1.0h, and the pressure in the kettle rises to 1.8MPa, keep this temperature and pressure reaction for 2.0 hours; (3) Slowly deflate, make the pressure in the kettle maintain 1.8MPa in the first 1.0 hour, and then drop the pressure in the kettle to normal pressure in the next 1.0 hour; (4) keep the reaction temperature at 240° C. for 2.0 hours under normal pressure, stop stirring, Open the discharge valve, fill with nitrogen, the material flows out through the injection h...

Embodiment 3

[0079] Nylon salt-forming steps are the same as in Example 1.

[0080] Polymerization of Nylon 1212: (1) Mix 600g of nylon 1212 salt with 600g of water, catalyst, molecular weight regulator, antioxidant, etc., and then add it to a 2.0L high-temperature and high-pressure polymerization kettle. The catalyst is sodium hypophosphite, and the molecular weight regulator is lauryl. Acid and antioxidant select antioxidant 1098, and the addition amount is 0.1wt%; (2) heat up to 200°C for 1.0h, and the pressure in the kettle rises to 1.5MPa, and keep this temperature and pressure reaction for 2.0 hours; (3) Slowly deflate, make the pressure in the kettle maintain 1.5MPa in the first 1.0 hour, and then drop the pressure in the kettle to normal pressure in the next 1.0 hour; (4) keep the reaction temperature at 240° C. for 2.0 hours under normal pressure, stop stirring, Open the discharge valve, fill with nitrogen, the material flows out through the injection head, and after cooling, it i...

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Abstract

The invention discloses a preparation method of long-carbon-chain nylon and obtained nylon. The method comprises the following steps: step 1, preparing nylon salt by using binary acid and diamine as raw materials; and step 2, mixing raw materials including the nylon salt, water, a catalyst and a molecular weight regulator, and carrying out polymerizing to obtain the long-carbon-chain nylon, wherein a weight ratio of the nylon salt to the water is 1: (0.7-2.5). The step 2 can be carried out by adopting an intermittent polymerization method or a solid-phase post-polycondensation method, preferably in a protective atmosphere. By adopting the method disclosed by the invention, the problems of long polymerization time, high energy consumption, unstable polymerization, easiness in oxidation and the like in the prior art are well solved; and by adopting the scheme of the invention, a polymerization process is stable and controllable, the obtained long-carbon-chain nylon has good relative viscosity, strength and chromaticity, and a better technical effect is achieved.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to nylon, in particular to a preparation method of long carbon chain nylon and the obtained nylon. Background technique [0002] Long carbon chain nylon generally refers to nylon with a methylene chain length of more than 10 carbons in the chain segment, including nylon 11, nylon 12, nylon 1212, nylon 1012, nylon 1313, etc. From the perspective of the chain structure of long carbon chain nylon resin, the methylene group in the macromolecular chain is longer and the density of amide groups is low. Therefore, long carbon chain nylon has most of the general properties of general nylon, such as lubricity, wear resistance and compression resistance, and easy processing. In addition to high toughness and flexibility, low water absorption and high dimensional stability, conventional nylon 6 and nylon 66 do not have the characteristics. [0003] For example, nylon 1212 is a lon...

Claims

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Application Information

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IPC IPC(8): C08G69/26C08G69/28C08G69/30
CPCC08G69/26C08G69/28C08G69/30
Inventor 林程崔晶孙旭阳
Owner CHINA PETROLEUM & CHEM CORP
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