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Polypropylene composition and polypropylene flat filament and preparation method thereof

A polypropylene composition and polypropylene technology, applied in the direction of single-component polyolefin rayon, rayon manufacturing, stretch spinning, etc., can solve the problem that cannot be produced with high-strength polypropylene flat yarn, polypropylene molecular structure Isotacticity and molecular weight distribution width can not be taken into account, to achieve the effect of shortening the molding cycle, improving rigidity, stretching performance and mechanical strength

Active Publication Date: 2014-12-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing polypropylene resins cannot give consideration to the isotacticity of the polypropylene molecular structure and the width of the molecular weight distribution during the polymerization process, and cannot be used for the production of high-strength polypropylene flat filaments

Method used

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  • Polypropylene composition and polypropylene flat filament and preparation method thereof
  • Polypropylene composition and polypropylene flat filament and preparation method thereof
  • Polypropylene composition and polypropylene flat filament and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0049] The present invention does not specifically limit the water content in the alcohol corresponding to the alkoxy group in the preparation process of the above-mentioned alkoxy magnesium compound. In order to make the obtained alkoxy magnesium compound have more excellent performance, moisture content is required. The less the content, the better. Generally, the water content in the alcohol corresponding to the alkoxy group needs to be controlled below 1000 ppm, preferably below 200 ppm.

[0050] According to the present invention, the inert atmosphere is known to those skilled in the art, preferably nitrogen atmosphere and / or argon atmosphere. In addition, the preparation of the magnesium alkoxide compound usually uses an inert solvent as a reaction medium. Wherein, the inert solvent can be C 6 -C 10 At least one of alkanes or aromatics, preferably at least one of hexane, heptane, octane, decane, benzene, toluene, xylene and their derivatives.

[0051] According to the...

Embodiment 1

[0122] This embodiment is used to illustrate the polypropylene composition and polypropylene flat yarn provided by the present invention and the preparation method thereof.

[0123] (1) Preparation of polypropylene:

[0124] A. Preparation of titanium-containing solid catalyst component: After fully replacing the 16L pressure-resistant reactor with a stirrer with nitrogen, then add 10L ethanol, 300mL of 2-ethylhexanol, 11.2g iodine, 8g Magnesium chloride and 640g of magnesium powder were stirred and mixed evenly, and the system was heated to 75°C for reflux reaction while stirring, and the reaction was stopped until no hydrogen gas was discharged. The obtained reaction product was washed with 3L of ethanol, filtered, and dried to obtain dialkoxymagnesium with an average particle diameter D50 of 30.2 μm, a particle size distribution index SPAN of 0.81, and m of 0.015. Take 650g of the above dialkoxymagnesium, 3250mL of toluene, and 65mL of 2-isopropyl-2-isopentyl-1,3-dimethoxy...

Embodiment 2

[0136] This embodiment is used to illustrate the polypropylene composition and polypropylene flat yarn provided by the present invention and the preparation method thereof.

[0137] (1) Preparation of polypropylene:

[0138] A, preparation of titanium-containing solid catalyst component: (same as Example 1);

[0139] B, test device: (same as embodiment 1);

[0140] C. Test conditions:

[0141] Step (1) pre-polymerization: the reaction pressure is 2.5MPa, the reaction temperature is 10°C, and the reaction time is 12 minutes; the feeding amount of titanium-containing solid catalyst component and triethylaluminum is 0.4g / hour and 0.058mol / hour respectively Hour, the propylene feed rate is 10 kilograms / hour, obtains the propylene prepolymer that prepolymerization multiple is 100 gram polymer / gram catalyst;

[0142] Step (2) Gas-phase polymerization: The reaction temperature is 91°C, the reaction pressure is 2.3 MPa, and the reaction time is 60 minutes. The propylene prepolymer ...

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Abstract

The invention provides a polypropylene composition, a polypropylene flat filament prepared from the polypropylene composition, a preparation method of the polypropylene flat filament, and the polypropylene flat filament prepared by the method. The polypropylene composition comprises polypropylene and a nucleating agent; the molecular weight distribution index of the polypropylene is 2.5-5.5, and polymer tail index PIHT in molecular weight distribution width is greater than 1.9. The mechanical strength of the polypropylene flat filament is high.

Description

technical field [0001] The invention relates to a polypropylene composition, a polypropylene flat yarn made from the polypropylene composition, a preparation method of the polypropylene flat yarn and the polypropylene flat yarn prepared by the method. Background technique [0002] Polypropylene resin has been widely used for its excellent mechanical properties, optical properties, light weight and high price. Especially polypropylene film, because of its soft quality, high transparency, non-toxicity, good water resistance and high mechanical strength, can be used in many fields such as packaging, compounding and printing. [0003] Flat yarn is a chemical fiber monofilament with a flat cross section, which is the basic material for the production of plastic braids. Flat yarns are usually made of polypropylene and / or polyethylene resins. Among them, the production process of polypropylene flat yarn is as follows: cut the extruded tubular film or the flat film extruded by T-t...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08F110/06D01F6/46D01F1/10D01D5/42D01D5/12
CPCC08F110/06C08L23/12C08L2203/12C08L2205/24C08L2207/10C08L2314/02D01D5/12D01D5/426D01F1/10D01F6/46
Inventor 高达利张师军邹浩徐萌郭梅芳王良诗于鲁强张丽英邵静波徐凯
Owner CHINA PETROLEUM & CHEM CORP
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