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Production method for synthesizing high molecular weight nylon 9T resin from low molecular weight nylon 9T powder

A low-molecular-weight nylon and high-molecular-weight technology, which is applied in the polymer field, can solve the problems of unreachable nylon 9T chemical properties, mechanical properties, thermal properties, unreachable molding conditions, and wide molecular weight distribution, and achieves easy automation and control. Good chemical properties, easy to operate and simple effect

Inactive Publication Date: 2019-03-15
GUANGZHOU WANJIACHENG PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now the main manufacturer is Japan Kuraray Company (Kuraray). Nylon 9T resin is synthesized from monomer terephthalic acid and monomer nonanediamine, but in the synthesis process, the problem of wide molecular weight distribution often occurs, and some products are obtained. The low-molecular-weight by-product is low-molecular-weight nylon 9T powder. The by-product plastic injection molding and extrusion pelletizing cannot meet the molding conditions, and the chemical properties, mechanical properties, and thermal properties of nylon 9T (PA9T) resin cannot be achieved. It basically belongs to the substance with little practical value, and there is no report on the secondary synthesis of low molecular weight nylon 9T powder

Method used

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  • Production method for synthesizing high molecular weight nylon 9T resin from low molecular weight nylon 9T powder
  • Production method for synthesizing high molecular weight nylon 9T resin from low molecular weight nylon 9T powder
  • Production method for synthesizing high molecular weight nylon 9T resin from low molecular weight nylon 9T powder

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Embodiment 1

[0020] Embodiment 1: A kind of production method of low molecular weight nylon 9T powder condensation polymerization into high molecular weight nylon 9T resin

[0021] Described low-molecular-weight nylon 9T powder is that Japan's Kuraray company (Kuraray) obtains in the process of synthesizing nylon 9T resin by monomer terephthalic acid and monomer nonanediamine and is the by-product of 0.56dL / g intrinsic viscosity (its DSC test curve such as figure 1 , and its intrinsic viscosity is shown in Table 1).

[0022] The high-molecular-weight nylon 9T resin is formed by polycondensation of the following raw materials in parts by weight by combining liquid and solid phases: low-molecular-weight nylon 9T powder: 100 parts; water: 17 parts; catalyst (NaOH): 0.5 parts; Heat stabilizer: 0.15 parts;

[0023] The method includes the following steps:

[0024] 1) Add the raw materials into the polymerization kettle, adjust the pH value to 8.2, start heating the polymerization kettle to 1...

Embodiment 2

[0032] Reference Example 1, the difference is: raw material: low molecular weight nylon 9T powder: 100 parts; water: 60 parts; catalyst: 8 parts; thermal stabilizer: 3 parts; the catalyst is Na 2 SiO 3 ;

[0033] The method includes the following steps:

[0034] 1) Put the raw materials into the polymerization kettle, adjust the pH value to 7.1, vacuumize the pressure to -0.02MPa, control the reaction temperature at 250°C, and react for 3 hours to precipitate small molecule by-products and water;

[0035] 2) The raw materials are discharged from the polymerization kettle, transported by the mobile device to the twin-screw extruder for solid-phase polycondensation reaction, input inert gas carbon dioxide, the reaction temperature is 160-350°C, the vacuum pressure is -0.06MPa, and small molecule by-products are precipitated And moisture, the reaction is completed, the material is extruded from the twin-screw extruder, cooled, cut into pellets, and transported to the drying equ...

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Abstract

The invention discloses a production method for synthesizing a high molecular weight nylon 9T resin from low molecular weight nylon 9T powder. The high molecular weight nylon 9T resin is prepared by performing condensation polymerization on the following raw materials in parts by weight by adopting a method for combining a liquid phase and a solid phase: 100 parts of a low molecular weight nylon 9T powder, 5-60 parts of water, 0.01-8 parts of a catalyst and 0.01-3 parts of a heat stabilizer; the low molecular weight nylon 9T powder is a by-product obtained in a process of synthesizing a 9T resin from monomers terephthalic acid and nonamethylene diamine; the catalyst is Na2SiO3 or NaOH. The molecular weight of the low molecular weight nylon 9T powder is improved so as to be equivalent to that of the nylon 9T resin, and the high molecular weight nylon 9T resin provides excellent chemical property, mechanical property and thermal property and has excellent economic benefits and social benefits.

Description

Technical field: [0001] The invention relates to the technical field of macromolecules, in particular to a production method for synthesizing high-molecular-weight nylon 9T resin from low-molecular-weight nylon 9T powder. Background technique: [0002] Nylon (PA) has excellent mechanical properties, wear resistance, self-lubrication, oil resistance, and stability, and has become one of the most widely used plastics at home and abroad, ranking first among the five engineering plastics. [0003] Nylon 9T is also called PA9T, alias: Nylon 9T, chemical name: poly 1,9 nonyl terephthalamide, nylon 9T is a high temperature resistant engineering plastic, low water absorption, low density, often used in electronic parts and Mechanical parts have relatively stable dimensions, wear resistance, acid and alkali resistance, etc., so they are widely used in industry, especially in aviation and aerospace fields, and have important practical value. Now the main manufacturer is Japan Kuraray...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/28
CPCC08G69/28
Inventor 张炎城邱少华
Owner GUANGZHOU WANJIACHENG PLASTIC
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