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A kind of preparation method of nylon 512
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A technology of nylon and pentamethylenediamine, applied in the field of nylon materials, can solve the problems of rising prices and high prices of nylon 612
Active Publication Date: 2020-12-11
SHANDONG DONGCHEN ENG PLASTIC
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[0003] However, in the past two years, the price of hexamethylenediamine, a raw material of nylon 612, has risen sharply, causing the price of nylon 612 to remain high and bringing unbearable price pressure to the downstream product industry. Cheaper nylon material makes a lot of sense
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preparation example Construction
[0020] The application provides a kind of preparation method of nylon 512, comprises the following steps:
[0021] 1) Add 1,5-pentanediamine into a metering tank with a nitrogen seal, and add distilled water at a mass ratio of 1:1 to prepare an aqueous solution of 1,5-pentanediamine;
[0023] Then add the aqueous solution of 1,5-pentanediamine into the neutralization pot and stir and mix for neutralization reaction. The neutralization reaction temperature is controlled at 60-70°C, and the reaction ends after 30-60 minutes, and then the neutralization pot is measured. pH of the inner salt solution, and adjust the pH of the nylon 512 salt solution in the neutralization pot to 7.65-7.9 by adding 1,5-pentanediamine or dodecanedioic acid, and obtain qualified nylon 512 salt after completion solution;
[0024] 2) The nylon 512 salt ...
Embodiment 1
[0038] A preparation method of nylon 512, comprising the following steps:
[0039] 1) Pour 30Kg of liquid 1,5-pentanediamine into a metering tank filled with 30Kg of distilled water, seal the metering tank with 0.1MPa nitrogen, and prepare an aqueous solution of 1,5-pentanediamine;
[0040] Add 67.8Kg of dodecanedioic acid and 70Kg of distilled water into the neutralization pot, vacuumize and fill with nitrogen to gauge pressure 0.1MPa, repeat 2 times;
[0041] Then add the aqueous solution of 1,5-pentanediamine into the neutralization pot and stir and mix to carry out the neutralization reaction. The neutralization reaction temperature is controlled at 70° C., and the reaction ends after 30 minutes, and then the concentration of the salt solution in the neutralization pot is determined. The pH is 7.55, and the pH of the nylon 512 salt solution in the neutralization pot is adjusted to 7.8 by adding 1,5-pentanediamine, and a qualified nylon 512 salt solution is obtained after c...
Embodiment 2
[0048] Change the consumption of the dodecanedibasic acid in Example 1 to 0.015Kg, and adjust the holding pressure of the polymerizer to be 1.55MPa, and other conditions are the same as in Example 1. The performance indicators of the product are shown in Table 1.
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Abstract
The invention provides a method for preparing nylon 512. Raw materials for the nylon 512 include, by weight, 27-31 parts of 1,5-pentamethylene diamine, 69-72 parts of dodecanedioic acid, 30-125 partsof distilled water, 0.002-0.02 part of molecular weight regulators and 0.005-0.015 part of antioxidants. The method includes adding aqueous solution of the 1,5-pentamethylene diamine into neutralization pots, stirring and mixing the aqueous solution of the 1,5-pentamethylene diamine with aqueous solution of the dodecanedioic acid and carrying out neutralization reaction to obtain nylon 512 salt solution; carrying out polymerization reaction on filter liquor of the nylon 512 salt solution, the molecular weight regulators and the antioxidants in polymerization kettles to obtain the finished nylon 512. The method has the advantages that as shown by detection, diversified properties of the nylon 512 prepared by the aid of the method are basically equivalent to corresponding properties of nylon612, and accordingly the nylon 512 basically can be used in individual application fields instead of the nylon 612, but is low in cost.
Description
technical field [0001] The invention relates to the technical field of nylon materials, in particular to a preparation method of nylon 512. Background technique [0002] In recent years, nylon 612 has been widely used as a long carbon chain nylon engineering plastic. It has excellent properties such as wear resistance, low water absorption, high resilience, and oil resistance. It is widely used in filaments, auto parts, electronic appliances, Machinery and other industries. [0003] However, in the past two years, the price of hexamethylenediamine, a raw material of nylon 612, has risen sharply, causing the price of nylon 612 to remain high and bringing unbearable price pressure to the downstream product industry. The cheaper nylon material is of great importance. Contents of the invention [0004] The purpose of the embodiments of the present invention is to provide a method for preparing nylon 512. [0005] In order to solve the above-mentioned technical problems, the...
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