THERMOPLASTIC MOLDING COMPOSITION

Abstract

Described herein is a method of using glass fibers having a tensile strength according to DIN ISO 527-5 of 86.0 to 92.0 GPa, a tensile elastic modulus according to DIN ISO 527-5 of 2600 to 3200 MPa and a softening point according to DIN ISO 7884-1 of 900° C. to 950° C. the method including using the glass fibers to increase the weld seam strength of shaped articles made of molding materials including thermoplastic polyamides.

Claims

1. A method of using glass fibers having a tensile elastic modulus according to DIN ISO 527-5 of 86.0 to 92.0 GPa, a tensile strength according to DIN ISO 527-5 of 2600 to 3200 MPa and a softening point according to DIN ISO 7884-1 of 900° C. to 950° C. the method comprising using the glass fibers to increase the weld seam strength of shaped articles made of molding materials comprising thermoplastic polyamides obtained by injection molding.

2. The method of use according to claim 1, wherein the glass fibers have the following composition: B1) 55.5% to 62.0% by weight of SiO.sub.2, B2) 14.0% to 18.0% by weight of Al.sub.2O.sub.3, B3) 11.0% to 16.0% by weight of CaO, B4) 6.0% to 10.0% by weight of MgO, and B5) 0% to 4.0% by weight of further oxides, wherein the proportions of B3) CaO and B4) MgO sum to between 17.0% by weight and 24.0% by weight and the percentages by weight of B1) to B5) sum to 100% by weight.

3. The method of use according to claim 1, wherein the thermoplastic polyamide is selected from the group consisting of polyamide 6, polyamide 66, polyamide 6.10, polyamide 6T/6I, polyamide 6T/6, polyamide 6T/66 and copolymers and mixtures thereof.

4. A thermoplastic molding material comprising a) 30.0% to 90.0% by weight of at least one thermoplastic polyamide as component A), b) 10.0% to 70.0% by weight of glass fibers having a tensile elastic modulus according to DIN ISO 527-5 of 86.0 to 92.0 GPa, a tensile strength according to DIN ISO 527-5 of 2600 to 3200 MPa and a softening point according to DIN ISO 7884-1 of 900° C. to 950° C. as component B), c) 0% to 3.0% by weight of at least one heat stabilizer as component C), and d) 0% to 30.0% by weight of further additives and processing aids as component D), wherein the component D) comprises 0.05% to 3% by weight of carbon black, wherein the percentages by weight of the components A) to D) sum to 100% by weight.

5. The thermoplastic molding material according to claim 4, wherein said thermoplastic molding material employs a component B) of the following composition B1) 55.5% to 62.0% by weight of SiO.sub.2, B2) 14.0% to 18.0% by weight of Al.sub.2O.sub.3, B3) 11.0% to 16.0% by weight of CaO, B4) 6.0% to 10.0% by weight of MgO, and B5) 0% to 4.0% by weight of further oxides, wherein the proportions of B3) CaO and B4) MgO sum to between 17.0% by weight and 24.0% by weight and the percentages by weight of B1) to B5) sum to 100% by weight.

6. The thermoplastic molding material according to claim 4, wherein component D) comprises not only carbon black but also lubricant.

7. The thermoplastic molding material according to claim 4, wherein component C) is employed in an amount of 0.01% to 3.0% by weight.

8. The thermoplastic molding material according to claim 4, wherein component B) is selected from the group consisting of polyamide 6, polyamide 66, polyamide 6.10, polyamide 6T/6L, polyamide 6T/6, polyamide 6T/66 and copolymers and mixtures thereof.

9. The thermoplastic molding material according to claim 4, wherein component A) is employed in an amount of 15.0% to 55.0% by weight.

10. A process for producing the thermoplastic molding material according to claim 4, comprising mixing the components A), B) and optionally C) and D).

11. A method of using the thermoplastic molding material according to claim 4, the method comprising Using the thermoplastic molding material for producing fibers, films and shaped articles.

12. A fiber, film or shaped article made of a thermoplastic molding material according to claim 4.

13. A process for producing fibers, films or shaped articles, comprising extruding injection molding or blow molding the thermoplastic molding material according to claim 4.

14. The thermoplastic molding material according to claim 4, wherein component C) is employed in an amount of 0.02% to 2.0% by weight.

15. The thermoplastic molding material according to claim 4, wherein component C) is employed in an amount of 0.05% to 1.0% by weight.

16. The thermoplastic molding material according to claim 4, wherein component A) is employed in an amount of 20.0% to 40.0% by weight.

17. The thermoplastic molding material according to claim 4, wherein component A) is employed in an amount of 25.0% to 35.0% by weight.

Description

EXAMPLES

[0209] The following input materials were used: [0210] Polyamide 6: Ultramid® B27 from BASF SE, melting point: 220° C., viscosity number (0.5% in 96% H.sub.2SO.sub.4): 150 ml/g, amino end groups: 37 mmol/kg [0211] ECR glass fiber: standard E-Glass NEG ChopVantage 3610HP (diameter: 10 μm) [0212] High strength glass fiber: Composition: SiO.sub.2: 60.8% by weight, Al.sub.2O.sub.3: 15.2% by weight, MgO: 6.8% by weight, CaO: 15.5% by weight, Na.sub.2O: 0.8% by weight; treated with a silane size suitable for bonding to PA; diameter: 10 μm [0213] Stabilizer: Irganox® 1098 from BASF SE (heat stabilizer) [0214] Carbon black: Printex 60 from Orion Engineered Carbons GmbH [0215] Lubricant: ethylenebisstearamide (EBS) from Lonza Cologne GmbH

[0216] The molding materials were produced by mixing the ingredients listed below in a twin-screw extruder ZE 25 A UTXi at temperatures of 260° C. The properties specified in table 1 below were determined by the specified standards valid 2019. The proportions of the ingredients are reported in % by weight.

[0217] The obtained pellet material was injection molded on an injection molding machine at a melt temperature of 290° C. to afford standard ISO dumbbells and assessed both visually and analytically. Production of the standard ISO dumbbells having a thickness of 4 mm and a length of 150 mm was carried out via injection points arranged opposite one another at the ends of the dumbbell so that the inflowing polyamide flowed from outside into the middle of the dumbbell to form a weld seam in the middle of the shaped article.

[0218] The weld seam strength was determined via a normalized braking stress test. Mechanical properties were determined according to DIN ISO 527 or 179-2/1 eU or 179-2/1 eAf (2019 version). The amounts reported in the table are in % by weight.

TABLE-US-00004 TABLE 1 Comparison Example Comparison Example Comparison Example Composition 1 1 2 2 3 3 Polyamide 6 69.1 74.1 64.1 69.1 59.1 64.1 ECR glass fiber 30 0 35 0 40 0 High strength glass fiber 0 25 0 30 0 35 Stabilizer 0.2 0.2 0.2 0.2 0.2 0.2 Carbon black 0.5 0.5 0.5 0.5 0.5 0.5 Lubricant 0.2 0.2 0.2 0.2 0.2 0.2 Unit DIN ISO Product features Density g/cm.sup.3 53479 1183 1.36 1.31 1.41 1.36 1.46 1.41 Mechanical properties (dry) Breaking stress MPa 527 174 175 187 192 198 205 Breaking elongation % 527 3.2 4.4 3.0 3.6 3.3 3.9 Charpy impact kJ/m.sup.2 179-2/1eU 82 98 93 104 99 108 strength Charpy notched kJ/m.sup.2 179-2/1eAf 10.2 12.8 12.9 13.5 14.5 14.7 impact strength Weld line tensile test (dry) Breaking energy J 527 1.40 1.56 1.25 1.48 1.10 1.30