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Special stress whitening resistant polypropylene composite for automotive upholsteries and method for preparing special stress whitening resistant polypropylene composite

A technology for anti-stress whitening and automotive interior parts, which is applied in the field of anti-stress whitening polypropylene composites for automotive interior parts and its preparation, and can solve the problems affecting the appearance, cracks, silver streaks and voids of interior parts. Molecular chain breakage and slippage, etc., to achieve the effects of good comprehensive mechanical properties, high elongation at break, and excellent fluidity

Inactive Publication Date: 2012-08-01
SHANGHAI KINGFA SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the matrix resin of automotive door panels, pillars and instrument panels and other interior materials is mainly made of polypropylene, the reinforcing filler is made of talcum powder, and the toughening rubber is made of ethylene octene copolymer (POE) thermoplastic elastomer, which is prepared by blending with a twin-screw extruder , this material has excellent toughness and processing performance, but it is easy to cause molecular chain breakage and slippage due to force during injection molding, ejection, demoulding and assembly, resulting in microscopic cracks, silver streaks and cavities in the stressed area of ​​the material , so that the refractive index of the stressed area changes, which is manifested in the macroscopic phenomenon of whitening of the stressed area, which affects the appearance of interior parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 94.8 kilograms of polypropylene PP BX3800, 0.1 kilogram of phenolic heat stabilizer Irganox1010 (CIBA company), 0.1 kilogram of processing aid calcium stearate, 5 kilograms of Exxon Mobil metallocene elastomer VM6202 in the aspect ratio of 1:40 Melting, mixing and dispersing in a special twin-screw extruder, the extrusion temperature is 200°C, extruding and granulating, and finally the product is obtained.

[0028] The product of the invention has excellent fluidity, good comprehensive mechanical properties, extremely high elongation at break and excellent anti-stress whitening performance. Melt flow rate ≥ 15g / 10min, tensile strength ≥ 17MPa, flexural modulus ≥ 1500MPa, room temperature (23 ℃) notched impact strength ≥ 7KJ / m2, elongation at break ≥ 200%, heat distortion temperature ≥ 100 ℃, 3mm circle The impact of falling balls (500g steel ball, 50cm height) does not turn white. The performance is as follows:

[0029] performance

Embodiment 2

[0031] 77.5 kg of polypropylene PPAZ564, 0.3 kg of phenolic heat stabilizer Irganox 1010 (CIBA company), 0.2 kg of processing aid calcium stearate, 10 kg of ExxonMobil metallocene elastomer VM6102, 2 kg of ExxonMobil phase Compatible agent CA-100, 10 kg of 3000-mesh talc powder were melted, mixed and dispersed in a twin-screw extruder with an aspect ratio of 1:40, and the extrusion temperature was 200°C, extruded and granulated to finally obtain the product.

[0032] The product of the invention has excellent fluidity, good comprehensive mechanical properties, extremely high elongation at break and excellent anti-stress whitening performance. Melt flow rate ≥ 15g / 10min, tensile strength ≥ 17MPa, flexural modulus ≥ 1500MPa, room temperature (23 ℃) notched impact strength ≥ 7KJ / m2, elongation at break ≥ 200%, heat distortion temperature ≥ 100 ℃, 3mm circle The impact of falling balls (500g steel ball, 50cm height) does not turn white. The performance is as follows:

[0033] ...

Embodiment 3

[0036] Compatible with 61 kg of polypropylene PP M2600R, 0.5 kg of phenolic heat stabilizer Irganox 1010 (CIBA), 0.5 kg of processing aid calcium stearate, 15 kg of ExxonMobil metallocene elastomer VM3980, and 3 kg of Bondyram Agent Bondyram 7003, 20 kg of 5000-mesh talc powder were melt-mixed and dispersed in a twin-screw extruder with an aspect ratio of 1:40, the extrusion temperature was 200°C, extruded and granulated, and finally the product was obtained.

[0037] The product of the invention has excellent fluidity, good comprehensive mechanical properties, extremely high elongation at break and excellent anti-stress whitening performance. Melt flow rate ≥ 15g / 10min, tensile strength ≥ 17MPa, flexural modulus ≥ 1500MPa, room temperature (23 ℃) notched impact strength ≥ 7KJ / m2, elongation at break ≥ 200%, heat distortion temperature ≥ 100 ℃, 3mm circle The impact of falling balls (500g steel ball, 50cm height) does not turn white. The performance is as follows:

[0038] ...

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Abstract

The invention discloses a special stress whitening resistant polypropylene composite for automotive upholsteries and a method for preparing the special stress whitening resistant polypropylene composite. The special stress whitening resistant polypropylene composite comprises raw materials including, in weight percent, 47-95% of polypropylene, 0-1% of heat stabilizers, 0-1% of processing agents, 0-6% of compatilizers, 5-20% of metallocene elastomers and 0-25% of talcum powder. The composite has excellent flowability, fine comprehensive mechanical performance, quite high breaking elongation and excellent stress whitening resistance, the melt flow rate is higher than or equal to 15g / 10min, the tensile strength is higher than or equal to 17MPa, the bending modulus is higher than or equal to 1500MPa, normal-temperature (23 DEG C) notch impact strength is higher than or equal to 7KJ / M2, the breaking elongation is higher than or equal to 200%, the heat deflection temperature is higher than or equal to 100 DEG C, and whitening is avoided under 3mm disc falling-ball impact (500g steel ball at a 50cm height). The special stress whitening resistant polypropylene composite can be used for the automotive upholsteries such as an automobile door panel, a vertical column, an instrument panel and the like requiring high stress whitening resistance.

Description

technical field [0001] The invention relates to a special anti-stress whitening polypropylene compound for automobile interior parts and a preparation method thereof, in particular to a polypropylene compound for automobile interior decoration such as automobile door panels, columns and instrument panels and a preparation method thereof. Background technique [0002] At present, the matrix resin of automotive door panels, pillars and instrument panels and other interior materials is mainly made of polypropylene, the reinforcing filler is made of talcum powder, and the toughening rubber is made of ethylene octene copolymer (POE) thermoplastic elastomer, which is prepared by blending with a twin-screw extruder , this material has excellent toughness and processing performance, but it is easy to cause molecular chain breakage and slippage due to force during injection molding, ejection, demoulding and assembly, resulting in microscopic cracks, silver streaks and cavities in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08L51/06C08L51/00C08K13/02C08K3/34B29B9/06B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/625B29C48/92B29C2948/92704B29C2948/92895
Inventor 李国明孙刚
Owner SHANGHAI KINGFA SCI & TECH
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