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Method for producing highly viscous polyamides

A technology for polyamide and polyamide particles, which is applied in the field of synthesizing high-viscosity polyamide, and can solve the problem that additives cannot be evenly distributed.

Active Publication Date: 2016-03-02
BASF SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the case of production-scale equipment, the additives are not uniformly distributed in the particle bed

Method used

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  • Method for producing highly viscous polyamides
  • Method for producing highly viscous polyamides
  • Method for producing highly viscous polyamides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0134] The solid state polycondensation reactor consisted of a heated steel pipe with a length of 1000 mm and a diameter of 100 mm. Nylon-6 pellets are introduced at the top through a gate and removed at the bottom through a screw.

[0135] 15 kg of granules were mixed with 7 kg of a solution comprising component A and component B. After 60 minutes, the liquid was removed through a frit / suction flask.

[0136] 5600 g of granules were charged into the tube and a nitrogen / steam mixture (490 L (STP) / h of nitrogen and 29.7 g / h of steam) was passed into the tube at 170° C. from the bottom. Every 2 hours, 330 g of granules were introduced from the gate and 300 g of granules were removed by the screw. The granules had been preheated in a drying oven at 110°C for 2 hours and heated at a gate at 160°C for 2 hours. The results are shown in Table 1 below.

[0137] Table 1

[0138] Feed VN: 144ml / g

[0139]

[0140] Comparative Example CE3 shows that the use of an endcapping agen...

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Abstract

The invention relates to a method for synthesizing a polyamide, in which method an aqueous solution is sprayed onto the polyamide before and / or during a solid-state post-condensation process. The aqueous solution comprises at least a first compound, selected from the group comprising phosphoric acid, fully neutralized salts of phosphoric acid, partially neutralized salts of phosphoric acid, and mixtures thereof, and a second compound, selected from the group comprising an acid, an anhydride, a lactone, ammonia, an amine, and mixtures thereof, with the stipulation that the second compound is not phosphoric acid and is not phosphoric acid anhydride. The spraying occurs at a temperature that lies below the boiling point of water. A polyamide that can be produced by means of the method according to the invention can be used in particular to produce films, monofilaments, fibers, threads, or textile sheet materials.

Description

technical field [0001] The present invention relates to a process for the synthesis of high-viscosity polyamides, the polyamides produced thereby and their use. Background technique [0002] Polyamides are one of the polymers produced on a large scale worldwide and - besides the main fields of use in films, fibers and materials - are also used in many other end uses. Among the polyamides, nylon-6 (polycaprolactam) is the most commonly produced polymer with a proportion of about 57%. The conventional method for the preparation of nylon-6 is the hydrolytic polymerization of ε-caprolactam, which is still of great industrial significance. In this way, other important polyamides can also be prepared by ring-opening polymerization. Conventional hydrolytic preparation methods are described, for example, in Ullmann's Encyclopedia of Industrial Chemistry, Online edition 03.15.2003, Vol. 28, pp. 552-553 and Kunststoffhandbuch, 3 / 4 Technische Thermoplaste: Polyamide [Plastics Handboo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/06C08G69/30C08L77/06
CPCC08G69/06C08G69/30C08G69/46C08J5/18C08J2377/02
Inventor R·哈弗奈R-E·格吕茨纳A·施塔默A·尤兹霍弗
Owner BASF SE