THERMOPLASTIC MOULDING COMPOUND

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 an impact strength and/or breaking elongation of molded articles made of molding materials including thermoplastic polyamides and elastomers.

Claims

1. 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 comprising using the glass fibers to increase an impact strength and/or breaking elongation of molded articles made of molding materials comprising thermoplastic polyamides and elastomers.

2. The method according to claim 1, wherein glass fibers having the composition C1) 55.5% to 62.0% by weight of SiO.sub.2, C2) 14.0% to 18.0% by weight of Al.sub.2O.sub.3, C3) 11.0% to 16.0% by weight of CaO, C4) 6.0% to 10.0% by weight of MgO, and C5) 0% to 4.0% by weight of further oxides are employed, wherein the proportions of C3) CaO and C4) MgO sum to between 17.0% and 24.0% by weight and the percentages by weight of C1) to C5) sum to 100% by weight.

3. The method according to claim 1, wherein the thermoplastic molding materials comprise at least one elastomer selected from the group consisting of b1) copolymers of ethylene with at least one comonomer selected from the group consisting of C.sub.3-12-olefins, C.sub.1-12-alkyl (meth)acrylates, (meth)acrylic acid and maleic anhydride as component B1), and b2) polyethylene or polypropylene as component B2), wherein components B1) and B2) may also be additionally grafted with maleic anhydride.

4. A thermoplastic molding material comprising a) 30.0% to 89.0% by weight of at least one thermoplastic polyamide as component A), b) 1.0% to 30.0% by weight of at least one elastomer as component B), selected from the group consisting of b1) copolymers of ethylene with at least one comonomer selected from the group consisting of C.sub.3-12-olefins, C.sub.1-12-alkyl (meth)acrylates, (meth)acrylic acid and maleic anhydride as component B1), b2) polyethylene or polypropylene as component B2), wherein components B1) and B2) may also be additionally grafted with maleic anhydride, c) 10.0% to 69.0% by weight of 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. as component C), and d) 0% to 30.0% by weight of further additives and processing aids as component D), wherein the percentages by weight of the components A) to D) sum to 100% by weight.

5. The molding material according to claim 4, wherein a component C) having the composition C1) 55.5% to 62.0% by weight of SiO.sub.2, C2) 14.0% to 18.0% by weight of Al.sub.2O.sub.3, C3) 11.0% to 16.0% by weight of CaO, C4) 6.0% to 10.0% by weight of MgO, and C5) 0% to 4.0% by weight of further oxides is employed, wherein the proportions of C3) CaO and C4) MgO sum to between 17.0% and 24.0% by weight and the percentages by weight of C1) to C5) sum to 100% by weight.

6. The molding material according to claim 4, wherein component D) comprises heat stabilizers, carbon black and lubricants.

7. The molding material according to claim 4, wherein component B) is employed in an amount of 2.0% to 20.0% by weight.

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

9. The molding material according to claim 4, wherein component C) is employed in an amount of 10.0% to 55.0% by weight.

10. The molding material according to claim 4, which comprises component B1) in which the at least one comonomer is selected from the group consisting of C.sub.3-8-olefins, C.sub.2-6-alkyl acrylates, and maleic anhydride.

11. The molding material according to claim 4, which comprises the component B1) and/or B2) grafted with maleic anhydride.

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

13. 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/or molded articles.

14. A fiber, film or molded article made of the thermoplastic molding material according to claim 4.

15. A process for producing fibers, films or molded articles made of the thermoplastic molding material according to claim 4, the process comprising extruding, injection molding or blow molding the thermoplastic molding material.

16. The molding material according to claim 4, wherein component B) is employed in an amount of 3.0% to 10.0% by weight.

17. The molding material according to claim 4, wherein component B) is employed in an amount of 3.5% to 7.0% by weight.

18. The molding material according to claim 4, wherein component C) is employed in an amount of 15.0% to 50.0% by weight.

19. The molding material according to claim 4, wherein component C) is employed in an amount of 25.0% to 40.0% by weight.

Description

EXAMPLES

[0193] The following input materials were used: [0194] 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 [0195] Polyamide 6.6: Ultramid® A27 from BASF SE, viscosity number (0.5% in 96% H.sub.2SO.sub.4): 150 ml/g, melting point: 264° C., amino end groups: 48 mmol/kg [0196] Elastomer: ethylene-propylene elastomer, grafted with maleic anhydride, [0197] Exxelor™ VA 1801 from ExxonMobil Petroleum & Chemical BVBA, density: 0.88 g/ml, melt flow index (230° C./10 kg; ISO1133): 9 g/10 min, glass transition temperature: −44° C. [0198] ECR glass fiber: standard E-Glass NEG ChopVantage 3610HP; diameter: 10 μm [0199] 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 [0200] Stabilizer: Irganox® 1098 from BASF SE [0201] Lubricant: ethylenebisstearamide (EBS) from Lonza Cologne GmbH [0202] Carbon black: Printex 60 from Orion Engineered Carbons

[0203] 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 the tables 1 and 2 below were determined by the specified standards valid 2019. The proportions of the ingredients are reported in % by weight.

TABLE-US-00004 TABLE 1 Composition Comparison 1 Comparison 2 Example 1 Example 2 Comparison 3 Polyamide 6 57.1 60.6 57.1 60.6 64.1 ECR glass fiber 35 35 0 0 0 High-strength glass fiber 0 0 35 35 35 Elastomer 7 3.5 7 3.5 0 Stabilizer 0.2 0.2 0.2 0.2 0.2 Carbon black 0.5 0.5 0.5 0.5 0.5 Lubricant 0.2 0.2 0.2 0.2 0.2 Unit DIN ISO Product features Density g/cm.sup.3 53479 1183 1.38 1.39 1.38 1.39 1.41 Mechanical properties (dry) Tensile elastic MPa 527 10209 10621 10812 11368 11818 modulus Breaking stress MPa 527 159 171 176 191 205 Breaking % 527 4.6 3.8 6.0 4.9 3.9 elongation Charpy impact kJ/m.sup.2 179-2/1eU 102 97 121 115 108 strength Charpy notched kJ/m.sup.2 179-2/1eAf 18.5 15.5 21.8 17.8 14.7 impact strength

TABLE-US-00005 TABLE 2 Composition Comparison 1 Comparison 2 Example 1 Example 2 Comparison 3 PA 6,6 59.1 64.1 59.1 64.1 69.1 ECR glass fiber 30 30 0 0 0 High-strength glass fiber 0 0 30 30 30 Elastomer 10 5 10 5 0 Stabilizer 0.2 0.2 0.2 0.2 0.2 Carbon black 0.5 0.5 0.5 0.5 0.5 Lubricant 0.2 0.2 0.2 0.2 0.2 Unit DIN ISO Product features Density g/cm.sup.3 53479 1183 1.33 1.34 1.33 1.34 1.36 Mechanical properties (dry) Tensile modulus MPa 527 8613 9213 9221 9912 10526 of elasticity Breaking stress MPa 527 137 165 150 181 208 Breaking % 527 3.6 3.5 4.1 3.9 3.8 elongation Charpy impact kJ/m.sup.2 179-2/1eU 92 81 118 105 93 strength Charpy notched kJ/m.sup.2 179-2/1eAf 15.2 11.4 19.5 15.0 10.5 impact strength