Modified polyamide, preparation method thereof and article obtained from said polyamide
A polyamide and modification technology, applied in the field of polyamide, can solve the problems of the reduction of molecular weight, thermodynamic properties and mechanical properties of thermoplastic polymers
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Embodiment 1
[0141] Example 1: Preparation of polyamide 66 with 5 mol % SBA
[0142] To the polymerization reactor, 87.2kg (332.5mol) of N salt (1:1 salt of hexamethylenediamine and adipic acid), 4057g of 96.7% sodium 3-carboxybenzenesulfonate (SBA) (17.5mol) were added, Hexamethylenediamine (HMD) (32.48% by mass) aqueous solution (9.5mol) 3398g and 83kg of demineralized water and 6.4g of Silcolapse 5020 Defoamer. The molar content of the sulfonate compound is equal to 17.5 / (332.5+9.5)=5%.
[0143] A polyamide containing 5 mol % SBA was prepared according to the standard polymerization method of the polyamide 66 type, post-polycondensation was carried out for 40 minutes under a vacuum of 70 mbar.
[0144] The polymer obtained was cast into rods under a tiny pressure of 1.7 bar, cooled and made into pellet form by chopping the rods. Example 1 recovered 75 kg of granules compared to the 70 kg of granules obtained in Comparative Example 1, and this was obtained at a very low casting press...
Embodiment 2
[0147] Example 2: Preparation of polyamide 66 with 10 mol % SBA
[0148] To the polymerization reactor, 132.77 g (0.506 mol) of N salt (1:1 salt of hexamethylene diamine and adipic acid), 12.73 g of 99% sodium 3-carboxybenzenesulfonate (SBA) (0.056 mol) were added , hexamethylenediamine (HMD) (mass fraction of 32.25%) aqueous solution (0.034mol) 12.20g and 127g of demineralized water and 2g of defoamer. The molar content of the sulfonate compound is equal to 0.056 / (0.506+0.034)=10%.
[0149] Polyamides containing 10 mol % SBA were prepared according to standard polymerization methods of the polyamide 66 type, post-polycondensation was carried out for 30 minutes under a vacuum of about 10 mbar.
[0150] The polymer obtained was cast on a disc under a very slight pressure of 1.2 bar.
[0151] The obtained polymer had the following properties: GTC=108.7 meq / kg, GTA=98.3 meq / kg, GTS=435 meq / kg, Mn=3120 g / mol. The number of chain end sulfonates per chain averaged 1.36.
[0152]...
Embodiment 3
[0153] Example 3: Preparation of polyamide 66 with 22 mol % SBA
[0154] To the polymerization reactor, 116.64 g (0.445 mol) of N salt (1:1 salt of hexamethylene diamine and adipic acid), 25.17 g of 99% sodium 3-carboxybenzenesulfonate (SBA) (0.111 mol) were added , hexamethylenediamine (HMD) (mass fraction of 32.25%) aqueous solution (0.058mol) 20.81g and 120.6g of demineralized water and 2g of defoamer. The molar content of the sulfonate compound is equal to 0.111 / (0.445+0.058)=22%.
[0155] A polyamide containing 20 mol % SBA was prepared according to the standard polymerization method of the polyamide 66 type, post-polycondensation was carried out for 30 minutes under a vacuum of 30 mbar.
[0156] The polymer obtained was cast on a disc under a very slight pressure of 1.2 bar.
[0157] The obtained polymer had the following properties: GTC=232.4 meq / kg, GTA=203.5 meq / kg, GTS=855 meq / kg, Mn=1550 g / mol. The number of chain end sulfonates per chain averaged 1.32.
[0158]...
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