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High-stiffness polypropylene resin composition having excellent flowability, heat resistance and aesthetic appearance

A technology of polypropylene resin and composition, applied in the field of polypropylene resin, can solve the problems of decreased rigidity and heat resistance, decreased gloss, poor scratch resistance of polypropylene resin, etc., and achieves excellent heat resistance and mechanical strength , Transparency improvement, excellent appearance effect

Active Publication Date: 2017-08-18
한화토탈에너지스주식회사
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the impact properties of ethylene-propylene block copolymers are improved due to the ethylene-propylene rubber phase, but compared with propylene homopolymers, rigidity and heat resistance are lowered, and opacity and gloss are lowered due to dispersion of the rubber phase. question
Japanese Patent Laid-Open No. 53-64257 etc. propose a composition in which an inorganic filler, rubber, etc. are mixed with a polypropylene resin to improve mechanical properties. However, due to the filler, the gloss is lowered, and the material cost and processing cost required for mixing are increased. , and as a low-cost filler to improve the mechanical properties of polypropylene, especially to improve heat resistance, talc is also used in large quantities, but similarly, the gloss decreases, the hardness of talc itself is low, and the scratch resistance of polypropylene resin filled with talc Less traumatic, so the appearance is easily damaged by scars
[0003] As a method of improving the gloss of polypropylene, Korean Laid-Open Patent Publication No. 2006-0104109 proposed adding aluminum toning pigments for mixing, but this method of applying external additives has increased material costs and processing costs required for mixing. Disadvantages that the process becomes complicated

Method used

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  • High-stiffness polypropylene resin composition having excellent flowability, heat resistance and aesthetic appearance
  • High-stiffness polypropylene resin composition having excellent flowability, heat resistance and aesthetic appearance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2 and comparative example 1、3～5

[0049] Catalyst preparation

[0050] In a 1-liter glass reactor with a stirrer fully replaced with nitrogen, 150 ml of toluene and diethoxymagnesium (a spherical shape with an average particle diameter of 60 μm, a particle size distribution index of 0.86, and an apparent density of 0.32 g) were added. / cc) 25g and kept at 10°C. 25 ml of titanium tetrachloride was diluted in 50 ml of toluene, and after 1 hour of feeding, the temperature of the reactor was raised to 60° C. at a rate of 0.5° C. per minute. The reaction mixture was stirred at 60° C. for 1 hour, and then the stirring was stopped. After the solid product was precipitated, the supernatant was removed, and 200 ml of new toluene was added, stirred for 15 minutes, and then washed once.

[0051] 150 ml of toluene was added to the solid product treated with titanium tetrachloride, and 50 ml of titanium tetrachloride was added at a predetermined rate over 1 hour while stirring at 250 rpm while maintaining the temperature ...

experiment example

[0057] The experimental methods used in the present invention are summarized below.

[0058] Physical property measurement method

[0059] (1) Melt Index

[0060] According to ASTM D1238 conditions, it measured at 230 degreeC and the load of 2.16 kg.

[0061] (2) Stereoregularity (Isotactic index, II)

[0062] The orientation of propylene polymerized in polypropylene was measured by the pentad method (Pentad) of a Nuclear Magnetic Resonance Spectrometer (NMR), and thus the stereoregularity was measured.

[0063] (3) Polydispersity index (Polydispersity index, PI)

[0064] As a method of measuring the molecular weight distribution, the storage modulus and the loss modulus were measured at a temperature of 200° C. in a Rheometrics Dynamic Spectrometer using rheological properties, using The crossover modulus (Gc) measures the polydispersity index by the following formula.

[0065]

[0066] (4) Ethylene content

[0067] Using infrared absorption spectroscopy (FT-IR), usi...

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PUM

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Abstract

The present invention relates to a high-stiffness polypropylene resin composition having excellent flowability, heat resistance and aesthetic appearance such as glossiness, transparency and the like, and to an ethylene-propylene block copolymer in which a propylene homopolymer and an ethylene-propylene rubber polymer are polymerized in phases. More specifically, the present invention relates to a high-stiffness polypropylene resin composition having excellent flowability, heat resistance and aesthetic appearance, the resin composition which comprises an organometallic nucleating agent and has the molecular weight distribution of a propylene homopolymer, an ethylene content of an ethylene-propylene block copolymer, an ethylene-propylene rubber content and the unique viscosity of the ethylene-propylene rubber adjusted in the presence of a Ziegler-Natta catalyst comprising a succinate-based internal electron donor.

Description

technical field [0001] The present invention relates to a polypropylene resin suitable for injection molding. Specifically, it is a polypropylene resin for injection molded products that is excellent in fluidity and heat resistance, excellent in appearance such as gloss and transparency, and excellent in moldability, physical properties, and appearance. In more detail, it relates to a highly rigid polypropylene resin composition excellent in fluidity, heat resistance and appearance, characterized in that it is based on a Ziegler-Natta catalyst containing a succinic acid-based internal electron donor. , high rigidity polypropylene resin with high stereoregularity and wide molecular weight distribution, and ethylene-propylene block copolymers that polymerize propylene homopolymers and ethylene-propylene rubber polymers in stages to adjust the properties of ethylene-propylene block copolymers Ethylene content, ethylene-propylene rubber content and intrinsic viscosity of ethylene...

Claims

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Application Information

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IPC IPC(8): C08L23/10C08L23/16C08L53/00
Inventor 金奉奭全龙成
Owner 한화토탈에너지스주식회사