KR20010004086A - The Manufacturing Method of Polypropylene Resin with High Tenacity and Coloration - Google Patents

Abstract

PURPOSE: Provided is a preparing method of polypropylene resin having high strength and good coloring. According to this method, while polymerizing of polypropylene resin by using Ziegler-Natta catalyst, residue derived from methyl benzoate-based external electron donor is restructed to act as a chromophore by using metal compound of talc. CONSTITUTION: The polypropylene resin comprises 1-50 wt.% of talc, 0.01-1.0 wt.% of antioxidizing agent, 0.01-0.5 wt.% of chlorinated inert agent, based on the weight of polypropylene resin. Further, the polypropylene resin is characterized by being polymerized by using methyl benzoate-based as external electron donor.

Description

{The Manufacturing Method of Polypropylene Resin with High Tenacity and Coloration}

The present invention relates to the preparation of a highly rigid primary colored polypropylene resin composition which does not require the addition of a coloring additive during molding processing by using the residue of an external electron donor contained in the resin and the metal component in the inorganic rigid nucleating agent when the inorganic rigid nucleating agent is added. will be.

More specifically, in the polymerization of a polypropylene resin using a Ziegler-Natta catalyst, an ethyl benzoate-based external electron donor is used so that the residue can act as a chromophore due to the influence of the metal compound in the talc serving as an inorganic rigid nucleating agent It relates to a method that can be modified to produce a primary color highly rigid polypropylene resin without the addition of additional colorants.

Polypropylene molded articles having high stiffness characteristics are mostly added with a large amount of inorganic rigid nucleating agents to increase rigidity, and therefore, additives for coloring are added during molding because of poor appearance. This, in turn, requires additional purchase of coloring additives and an additional masterbatch mixing process, leading to an increase in molding cost and throughput.

The present invention is to solve the problems described above, it is an object of the present invention to provide a method for producing a good fluorene appearance without the addition of coloring additives in the production of highly rigid composite polypropylene using talc.

The present invention consists in polymerizing polypropylene using an external electron donor that can easily react with chromophores by metal components in talc used as a rigid nucleating agent.

Hereinafter, the present invention will be described in detail.

The metal component in the inorganic rigid nucleating agent causes an automatic oxidation reaction in the polypropylene resin, which causes a chromophore structure in which the remaining external electron donor in the resin is cyan by a chain reaction.

The present invention is to melt and mix 1 to 50% by weight of inorganic rigid nucleating agent, 0.01 to 1.0% by weight of antioxidant and 0.01 to 0.5% by weight of chlorine deactivator to polypropylene resin using ethylbenzoate-based outer electron donor It has a high rigidity and prepares a polypropylene resin composition in a distal state.

At this time, the Ziegler-Natta catalyst is suitable for use as an external electron donor.

Embodiments of the present invention are as follows.

<Example>

[Ziegler-Natta catalyst preparation]

In a reactor with a stirrer, 5.72 g of magnesium ethoxide was suspended in 2.4 ml of ethyl benzoate and 75 ml of chlorobenzene at room temperature. 75 ml of titanium tetrachloride was gradually added to this suspension over 10 minutes, and it heated up to 110 degreeC, and stirred for 60 minutes. After the reaction was completed, the liquid reactant was removed to obtain a solid compound.

The solid compound was reacted with 40 ml of titanium tetrachloride for 10 minutes at 110 ° C. for 10 minutes, and then the solid compound obtained was washed three times with isopentane at room temperature, and then dried with nitrogen at 40 ° C. for 100 minutes.

As a result of analyzing the composition of the catalyst thus obtained, the titanium content was 3.48 wt%, ethyl benzoate 13.8 wt%, titanium tetrachloride 0.66 wt%, and ethylene oxide 1.11 wt%.

[Propylene polymerization]

1400 g of liquid propylene and 132 mmol of hydrogen were placed in a 4 L autoclave reactor equipped with a stirrer. 0.18 to 0.22 mmol of paraethoxyethylbenzoate and 2.5 ml of carbon tetrachloride diluted in xylene were added to the reactor, followed by the Ziegler-Natta catalyst diluted in mineral oil. After stirring for about one hour while maintaining 67 ℃ 400g of polypropylene polymer was obtained.

[Additives]

The polypropylene powder prepared by the above method was introduced into an extruder at 210 ° C., mixed and melted with 0.01 to 10% by weight of antioxidant, 0.01 to 05% by weight of chlorine deactivator, and 1 to 50% by weight of talc, and melted to obtain a high stiff blue green polypropylene. A resin was obtained.

<Comparative Example>

Unlike the examples, polypropylene resin prepared using Ziegler-Natta catalyst (TK-220) manufactured by Mitsui Chemicals, Japan, which uses a silane-based compound as an external electron donor, was added with additives in the same manner as in Example. As shown in Fig. 1, no coloring effect appeared.

Talc content Example Comparative example Lc YI Lc YI 0% 60.5 13.82 59.8 14.02 10% 29.7 17.18 57.3 14.20 20% 18.2 23.39 59.6 14.32 30% 12.9 28.29 55.2 17.38

By using the polypropylene manufacturing method of the present invention, it is not necessary to add an additive for coloring in the production of a high-strength composite polypropylene using talc, thereby reducing the process and reducing the cost.

Claims (4)

1 to 50% by weight of inorganic rigid nucleating agent, 0.01 to 1.0% by weight of antioxidant and 0.01 to 0.5% by weight of chlorine deactivator, which are mixed with the polypropylene resin, are manufactured by mixing and melting. Method for producing a polypropylene resin composition. The method of claim 1, wherein the polypropylene resin is polymerized through a catalyst using an ethoxyethyl benzoate system as an external electron donor. The method for producing a highly rigid primary colored polypropylene resin composition according to claim 1, wherein the inorganic rigid nucleating agent is talc. The method for producing a highly rigid primary colored polypropylene resin composition according to claim 1, wherein the polypropylene resin composition contains a conventional ultraviolet stabilizer, a lubricant, and the like.