TH42152A3 - Methods for the production of polyamide - Google Patents

Abstract

DC60 to produce polyamide with a non-reactive caprolactum content from 0 to 0.5% wt and oligomer content from 0-1.25% wt and relative viscosity. In a solution of 0.01 g / ml of sulfuric acid at 25 ° C. From 2.2 to 8.0, which includes the first step of polymerization. The starting substance containing caprolactum, under atmospheric pressure To prepare the produce of Polymerization with the non-reactive caprolactum content of not more than 25% by weight and the oligomer content is between 0 and 1.8% by weight, the second step of the Heating the produce Of the polymerization prepared in the first step, at temperature T is by formula (1) as follows and under reduced pressure To separate the inactive caprolactum And the oligomers go out of the product, resulting in a polymerization point through the glass transformation of polyamide. ≪ T < Polyamide melting point + 150 ° C. (1) To produce a polyamide with a non-reactive caprolactum content from 0 to 0.5% wt and an oligomer content from 0 - 1.25% wt and has a Relative viscosity in a solution of 0.01 g / ml of sulfuric acid at 25 ํ C from 2.2 to 8.0, which includes the first step of polymerization. The starting agent containing caprolactum, under atmospheric pressure To prepare the produce of Polymerization with the non-reactive caprolactum content of not more than 25% by weight and the oligomer content is between 0 and 1.8% by weight, the second step of the Heating the produce Of the polymerization prepared in the first step, at temperature T is by formula (1) as follows and under reduced pressure To separate the inactive caprolactum And the oligomers go out of the product, resulting in a polymerization point through the glass transformation of polyamide. ≪ T < Polyamide melting point + 150 ํ (1)

Claims (1)

1.Method for the production of polyamide from caprolactum. Polymerization, such polyamides with a caprolactum content of 0 to 0.5% by weight and oligomer content from 0 - 1.25% by weight. It had a relative viscosity in a solution of 0.01 g / ml of sulfuric acid at 25 ํ from 2.2 to 8.0, which included (a) the polymerization of the starting agent. That consists of caprolactum, under pressure Atmosphere for the preparation of polymerization products with a non-reactive caprolactum content of not more than 25% by weight and oligomer content between 0 and 1.8% by weight, And (b) heating the polymerization product at temperature T that follows formula (1) following formula (1) and under reduced pressure to separate the carprolactum at Does not react And Oligomer went out of Production of polymerization Polyamide glass transformation point < T < Polyamide melting point = 150 ํ (1) by glass transformation point. And the melting point of polyamide is measured by differential. Scanning Calories (differential scanning calorimetry) (DSC) using polyamide samples. This was prepared by rapidly cooling the molten polyamide sample at a heating rate of 20 ํ / min. The glass transition point can be obtained as a bent point in the thermal profile. The specificity of the polyamide, and the melting point is determined as the top temperature of the endothermic peak. The basis of the fusion of the aforementioned polyamide crystals. 2. The method for the production of polyamide holds the rights to claim number 1, where, in the procedure (a), the temperature of the polymer. The arization is not higher than the melting point of the produced polyamide, and this step will Continue For a period of at least 70% of the polymerization time. 3. The method for the production of polyamide is entitled Clause 1, whereby the polyamide temperature The highest mering point (a) is not higher than the melting point of the polyamide produced. 4. The method for the production of polyamide holds the right to claim that 1, where, in step (a), the salts of dicarboxylic acid / diamine, catalyst, were used in a maximum amount of 10 mol% of all initial compounds. 5. Method for the production of polyamide, as in claim No. 4, by acid salts. Such dicarboxylic / diamine Is a type that is derived from aliphatic acid And / or grooving aromatic Dicarboxylic and aliphatic diamine 6. Method for the production of polyamide, which holds the right to claim No. 4 by the dicarboxylic, which consists of Is the salts of dicarboxylic acid / diamine, is that of the acetic acid, and / or diamine, which make up the salts of dicarboxylic acid / diamine. Amine is hexamethylenediamine 7. Method for the production of polyamide, as in claim No. 4, by acid salts. Such dicarboxylic / diamine Is adipic acid And hexamethylenediamine 8. Method for the production of polyamide assumes one of the rights of Clause 1 to Clause 7, whereby such heat treatment is treated as a precautionary measure. In the second (b) sequence step, it is performed in the melt phase at no Below the melting point of the polyamide produced, under reduced pressure with agitation 9. The method for the production of polyamide holds the right to claim No. 1, by practice. way Such heat in the aforementioned second step Acting in the solid phase at temperatures below the melting point Liquid of polyamide produced, and under low pressure with agitation of 1 0. Polyamide obtained in accordance with the manufacturing method of claims 1 to No. 7. 1 1. Die-casting materials produced by polyamide die-casting, obtained in accordance with the manufacturing method of Clause 1 to Clause 7.