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Polypropylene resin composition and process for producing the same

A polypropylene resin and composition technology, applied in the field of polypropylene resin composition and its preparation, can solve problems such as adverse effects on productivity, poor dispersion of inorganic fillers, etc., and achieve the effects of excellent appearance and improvement of flexural modulus of elasticity

Active Publication Date: 2007-08-08
JAPAN POLYPROPYLENE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In view of the above-mentioned problems, the object of the present invention is to provide a talc-containing polypropylene resin composition and a preparation method thereof that can solve the following problems and shortcomings, and the talc-containing polypropylene resin composition is mixed in-line and has no White spots caused by poor dispersion. The problem is that when using a twin-screw kneader of the scale used in industrial production plants for actual preparation, since a large amount of resin is mixed in a short time, it is difficult to use the above-mentioned CIM-90. In the case of a relatively small-scale kneader, even if it can be added without problems, it causes a new problem of poor dispersion of the inorganic filler (white spots); the disadvantage is that when the degree of compression is reduced to eliminate white spots , due to the increase in the amount of air that is brought in, especially in the case of large mixers, it will have an adverse effect on productivity

Method used

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  • Polypropylene resin composition and process for producing the same

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[0078] [II] Preparation method of talc-containing polypropylene resin composition

[0079] The method for producing the polypropylene resin composition of the present invention comprises supplying the above-mentioned polypropylene resin and the above-mentioned degassed compressed talc to an extruder installed downstream of a polymerization reactor for producing the above-mentioned polypropylene resin, and performing melt-kneading.

[0080] The talc-containing polypropylene resin composition of the present invention is prepared by melt-kneading with a large-scale kneader with a large extrusion capacity. At this time, in order to obtain the economic advantage of in-line mixing, it is preferable to perform the transfer, premixing, melt-kneading, and granulation steps consecutively from the polymerization step as described below.

[0081] First, the polypropylene resin prepared by the polypropylene polymerization equipment is transferred to the mixing and granulation equipment thr...

Embodiment 1

[0101] Microparticle talc (manufactured by Hayashi Kasei Co., Ltd.: MW5000S) with an average particle size of 5.0 μm and a volume specific gravity of 0.12 (manufactured by Hayashi Kasei Co., Ltd.: MW5000S) (hereinafter referred to as raw material 1) was degassed once using Klipak manufactured by Kurimoto Iron Works until the volume specific gravity reached 0.35. After that, without taking it out, it was compressed twice using a roller compactor manufactured by Kurimoto Iron Works (roller gap: 1.1mm, roller rotation speed: 10rpm, extrusion screw: 17rpm) to prepare degassed compressed talc (talc-1 ).

[0102] The properties of this talc-1 were that the volumetric specific gravity was 0.58, the amount of components larger than 1000 μm was 5.5% by weight, and the amount of components larger than 500 μm was 35.9% by weight as measured by the Rotap sieve method. In addition, the amount of components of 500 μm or more measured by the improved sieve method was 3.4% by weight, which is...

Embodiment 2

[0107]In Example 1, except that polypropylene homopolymer (PP-2: MFR=6g / 10 minutes, produced by Japan Polypro (KK) Co., Ltd., product name MA4CQ) was used instead of PP-1, it was completely the same as in Example 1. The experimental conditions were melt-kneaded to prepare a polypropylene resin composition. The obtained pellets were subjected to injection molding and evaluated for white spots. The results are shown in Table 2.

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Abstract

This invention provides a talc-containing polypropylene resin composition using in-line compounding, which can solve a problem that, when the degree of compression is reduced to eliminate white points derived from poor dispersion of an inorganic filler, the amount of introduced air is increased, leading to adverse effect of productivity particularly in the case of a large kneader, and a process for producing the same. The polypropylene resin composition comprises degassing compressed talc (A) and a polypropylene resin (B). The degassing compressed talc has a bulk specific gravity of 0.3 to 1.0 and a degree of compression of 3.1 to 7.0 and is produced by degassing compression of talc having an average particle diameter of 0.1 to 12 mum and a bulk specific gravity of 0.1 to 0.5. In this degassing compressed talc, the proportion of a fraction having a size of not less than 1,000 mum as sieved by a rotap method is not more than 15% by weight.

Description

technical field [0001] The present invention relates to a talc-added polypropylene resin composition and a method for preparing the same, more specifically, to a talc-added polypropylene resin composition having excellent mechanical properties and a method for economically preparing the composition. Background technique [0002] In recent years, for industrial parts such as bumpers, instrument panels, door trims, and pillar trims, polypropylene-based composite materials with inorganic fillers such as talc and elastomers added are mostly used. Because they have an excellent balance of physical properties and excellent formability. [0003] Usually, these polypropylene-based composite materials can be produced by melt-kneading a polypropylene resin, an elastomer component, and an inorganic filler component (talc in many cases) as raw materials using a twin-screw kneader. [0004] Recently, from the viewpoint of promoting energy-saving environmental protection, and from the ec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/10C08K7/00C08K3/34
CPCB29L2031/3008C08K3/34B29L2031/3044C08K5/1345C08K5/098B29L2031/3005C08L23/10Y10T428/2982C08K3/346B29C45/0013B29K2023/12
Inventor 残华幸仁石井泉松冈健二
Owner JAPAN POLYPROPYLENE CORP
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