THERMOPLASTIC MOLDING COMPOSITION

Abstract

Described herein is a thermoplastic molding composition, including A) from 10 to 60% by weight of a thermoplastic semicrystalline polyamide-6, B) from 5 to 50% by weight of a thermoplastic semiaromatic semicrystalline polyamide containing repeating units of hexamethylenediamine and terephthalic acid, C) from 10 to 65% by weight of fibrous and/or particulate fillers, and D) from 0 to 30% by weight of further additives,

where the total of the percentages by weight of components A) to D) is 100%.

Claims

1. A thermoplastic molding composition, comprising A) from 10 to 60% by weight of a thermoplastic semicrystalline polyamide-6, B) from 5 to 50% by weight of a thermoplastic semiaromatic semicrystalline polyamide containing repeating units of hexamethylenediamine and terephthalic acid, C) from 10 to 65% by weight of fibrous and/or particulate fillers, and D) from 0 to 30% by weight of further additives, wherein the total of the percentages by weight of components A) to D) is 100%, wherein the weight ratio of component A) to component B) is 1:1 to 10:1.

2. The thermoplastic molding composition according to claim 1, comprising from 30 to 65% by weight of a fibrous filler.

3. The thermoplastic molding composition according to claim 1, in which the thermoplastic polymer B) contains 55 to 95% by weight of repeating units of hexamethylenediamine and terephthalic acid.

4. The thermoplastic molding composition according to claim 1, in which the thermoplastic polymer B) is selected from the group consisting of polyamide-6T/6, polyamide-6T/66, polyamide-6T/6I, and mixtures thereof.

5. The thermoplastic molding composition according to claim 1, containing 0.05 to 3% by weight of an antioxidant as component D) or part of component D), based on the total of the percentages by weight of components A) to D) which is 100 percent.

6. The thermoplastic molding composition according to claim 1, containing 15 to 50% by weight of component A).

7. (canceled)

8. A method of using a thermoplastic semiaromatic semicrystalline polyamide containing repeating units of hexamethylenediamine and terephthalic acid, the method comprising using the thermoplastic semiaromatic semicrystalline polyamide containing repeating units of hexamethylenediamine and terephthalic acid as an additive for thermoplastic semicrystalline polyamide-6 compositions for improving the mechanical properties at temperatures above 60° C. and in humid environments, wherein the weight ratio of the thermoplastic semicrystalline polyamide-6 compositions to the thermoplastic semiaromatic semicrystalline polyamide containing repeating units of hexamethylenediamine and terephthalic acid is 1:1 to 10:1.

9. The method according to claim 8, the method comprising using the thermoplastic semiaromatic semicrystalline polyamide containing repeating units of hexamethylenediamine and terephthalic acid as an additive for producing fibers, foils, and moldings of any type.

10. A fiber, foil or molding, made of the thermoplastic molding composition according to 6 claim 1.

Description

EXAMPLES

[0126] The following components were used:

[0127] Component A)

[0128] PA6:

[0129] Polyamide-6 having a viscosity number VZ of 150 ml/g, measured on a 0.5 strength by weight solution in 96% strength by weight of sulfuric acid at 25° C. to ISO 307 (using Ultramid® B27 from BASF SE)

[0130] PA66:

[0131] Polyamide-66 having a viscosity number VZ of 150 ml/g, measured on a 0.5 strength by weight solution in 96% strength by weight of sulfuric acid at 25° C. to ISO 307 (using Ultramid® A27 from BASF SE).

[0132] Component B)

[0133] PA6T/6:

[0134] Polyamide-6T/6 (70:30) having a viscosity number VZ of 125 ml/g, measured on a 0.5 measured on a 0.5 strength by weight solution in 96% strength by weight of sulfuric acid at 25° C. to ISO 307 (using Ultramid® T315 from BASF SE).

[0135] PA6I/6T:

[0136] Polyamide-6I/6T (70:30) having a viscosity number VZ of 80 ml/g, measured on a 0.5 measured on a 0.5 strength by weight solution in 96% strength by weight of sulfuric acid at 25° C. to ISO 307 (using Selar® 3426 from DuPont de Nemours Deutschland GmbH).

[0137] PA6T/6I:

[0138] Polyamie-6T/6I (70:30) having a viscosity number VZ of 90 ml/g, measured on a 0.5 measured on a 0.5 strength by weight solution in 96% strength by weight of sulfuric acid at 25° C. to ISO 307 (using Arlen® 3000 from Mitsui Chemicals, Inc.).

[0139] PA6T/66:

[0140] Polyamide-6T/66 (70:30) having a viscosity number VZ of 100 ml/g, measured on a 0.5 measured on a 0.5 strength by weight solution in 96% strength by weight of sulfuric acid at 25° C. to ISO 307 (using Arlen® C2000 from Mitsui Chemicals, Inc.).

[0141] Component C)

[0142] Glass fiber:

[0143] DS 1110 having a diameter of 10 μm (from 3B Fibreglass).

[0144] Component D)

[0145] Heat stabilizer:

[0146] Irganox® 1098 from BASF SE.

[0147] Lubricant:

[0148] Ethylene bis stearamide (EBS) from Lonza Cologne GmbH.

[0149] Preparation of the granules

[0150] The nature-colored polyamide granules were dried in a drying oven at 100° C. for 4 hours so that the humidity was below 0.1%. Afterwards, they were mixed with the other components in a twin-screw extruder having a diameter of 25 mm, and a L/D ratio of 44 which was operated at 300 to 390 min-1 and at 20 kg/h and at a cylinder temperature of 290° C. for Comparative Examples 1 and 2, at 320° C. for Comparative Example 3, and at 350° C. for Examples 1 to 3. The extrudates were cooled in a water bath and subsequently granulated.

[0151] The granules obtained were used for injection-molding tensile bars, according to ISO 527-2 and Charpy sticks according to ISO 179-1. The results are shown in the below table.

[0152] Tensile modulus of elasticity, tensile stress at break and tensile strain at break are determined according to ISO 527. The values at 80° C. are obtained according to ISO 178. The Charpy (notched) impact resistance is determined according to ISO 179-2/1eU and ISO 179-2/1eAf, respectively. Melting point and crystallization temperature are determined according to ISO 11357. All of the norms refer to the version valid in 2019.

TABLE-US-00002 Comparative Comparative Comparative Composition [wt %] Example 1 Example 2 Example 3 Example 1 Example 2 Example 3 PA 66 0 0 34.6 0 0 0 PA 6 49.5 34.6 0 34.6 34.6 34.6 PA 6I/6T 0 14.9 14.9 0 0 0 PA 6T/6 0 0 0 14.9 0 0 PA 6T/6I 0 0 0 0 14.9 0 PA 6T/66 0 0 0 0 0 14.9 Glas fiber (DS1110) 50 50 50 50 50 50 Heat stabilizer (Irganox ® 1098) 0.25 0.25 0.25 0.25 0.25 0.25 Lubricant (EBS) 0.25 0.25 0.25 0.25 0.25 0.25 Characteristics Melting point (DSC) [° C.] 220 215 250 212 211 210 Crystallization temperature (DSC) [° C.] 190 182 214 175 173 200 Mechanical properties (dry) Tensile modulus of elasticity [MPa] 16056 16913 16071 17258 18660 18011 Tensile stress at break [MPa] 224.0 233 229 232 280 248 Tensile strain at break [%] 3.5 3.4 2.9 3.5 2.9 3.0 Tensile modulus of elasticity at 80° C. [MPa] 9659 7510 9019 8886 10404 9016 Tensile stress at break at 80° C. [MPa] 136.0 120 132 145 155 149 Tensile strain at break at 80° C. [%] 7.8 10.8 7.8 8.2 7.0 7.5 Charpy impact resistance [kJ/m.sup.2] 101 100 95.0 102 115 108 Charpy notched impact resistance [kJ/m.sup.2] 19.1 14.9 13.2 16.4 16.5 15.9 Mechanical properties (humid) Tensile modulus of elasticity [MPa] 15560 11984 15543 13986 14885 13359 Tensile stress at break [MPa] 165 145 194 183 198 185 Tensile strain at break [%] 6.5 5.1 3.7 5.0 4.2 4.6 Tensile modulus of elasticity at 80° C. [MPa] 5831 6041 5549 6855 8969 7967 Tensile stress at break at 80° C. [MPa] 106 79 87 91 118 106 Tensile strain at break at 80° C. [%] 6.6 11.2 11.5 10.2 7.2 7.7 Charpy impact resistance [kJ/m.sup.2] 110 76 104.0 98 106 96.0 Charpy notched impact resistance [kJ/m.sup.2] 28.3 15.6 15.0 17.7 17.3 20.0