JPH06287366A - Polypropylene resin composition - Google Patents

Abstract

PURPOSE:To provide the title composition improved in recyclability, mechanical properties and heat resistance by mixing a polypropylene resin with a ground product of a specified cured thermosetting resin. CONSTITUTION:100 pts.wt. polypropylene resin is mixed with 3-70 pts.wt. ground product of a cured benzene-ring-containing thermosetting resin optionally containing an inorganic or organic filler. Thus, the amount of the inorganic filler compounded in the polypropylene resin can be reduced, and therefore the recyclability can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polypropylene resin composition having excellent mechanical properties such as strength and elastic modulus and heat resistance.

[0002]

2. Description of the Related Art Polypropylene resin is one of olefin resins. Among thermoplastic resins, mechanical properties such as hardness and elastic modulus, electrical properties such as dielectric properties at high frequency and breakdown voltage, heat resistance and chemical resistance. Excellent in electrical equipment such as TV and radio parts, packaging film for food and medicine,
It is used for a wide range of purposes such as pipes for hot springs and hot water for factories, food containers, textiles such as clothes and industrial ropes.
Recently, automobile bumpers, engine room interior parts,
It is also used in large parts such as instrument panels, and due to the excellent recyclability of polypropylene, the amount used for automobiles and the like tends to increase in the future.

The excellent properties of polypropylene products can be further enhanced by incorporating additives in addition to those due to the resin itself. The additive is an inorganic filler such as talc, diatomaceous earth, glass fiber, calcium carbonate, mica, etc. By adding these, properties such as mechanical properties and heat resistance are improved. Currently, molded articles such as automobile bumpers are required to have good recyclability. Conventionally, it has been necessary to add a large amount of inorganic filler to these applications, and in that case, there has been a problem that the recyclability is lowered. In order to improve recyclability, there is a demand for a method of reducing the amount of the inorganic filler to be blended and maintaining / improving the strength.

[0004]

From the above viewpoints, the present inventor has studied various methods for reducing the compounding amount of the inorganic filler to the polypropylene resin and improving the strength, and as a result, found that a good compounding agent was obtained. The present invention has been completed and the present invention has been completed.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a polypropylene resin composition comprising a polypropylene resin and a pulverized product of a thermosetting resin cured product containing a benzene nucleus. The pulverized product of the thermosetting resin cured product in the present invention is mainly a mixture of various additives to the thermosetting resin, which has extremely high rigidity, and should be used in place of the conventional inorganic filler. The performance is equivalent to or higher than that of the inorganic filler. The benzene nucleus-containing thermosetting resin is a phenol resin having phenol and alkylphenol as the main skeleton, bisphenol, or an epoxy resin having novolak of phenol or alkylphenol as the main skeleton, and the cured product thereof has rigidity and heat resistance. Are better. The resin cured product may be a resin alone,
Silica, talc, calcium carbonate, inorganic fillers such as glass fibers, or organic fillers such as wood powder and walnut powder as other components, and a cured product having a dense and uniform composition,
Further, since the rigidity is improved, it is extremely effective as a strength improving compounding agent for polypropylene resin.

The above-mentioned composition of thermosetting resin and filler may be directly cured and crushed, or sprue, runner, etc. generated when a molded product is obtained by heating and pressurizing as a molding material are crushed. Good. By blending the pulverized product of the thermosetting cured product with the polypropylene resin, the proportion of the inorganic filler can be reduced to improve the recyclability and further improve the performance. The polypropylene resin composition of the present invention is a molded product as a product shape,
It can be applied to pipes, sheets, etc. and satisfies the required characteristics in each application. The compounding amount of the thermosetting resin cured product is not particularly specified, but about 3 to 70 parts by weight relative to 100 parts by weight of polypropylene, the effect of improving rigidity is particularly good.

[0007]

【Example】

<< Example >> Phenolic resin molding material (glass fiber 30
%, Talc 20%), the sprue and runner generated during the molding were crushed to obtain a crushed product having an average particle size of 40 μm. Next, 60 parts by weight of polypropylene and 40 parts by weight of the above powder were heated and mixed to form a uniform composition, and a sheet having a thickness of 3 mm was prepared. Comparative Example 60 parts by weight of polypropylene and 40 parts by weight of talc were heated and mixed to form a uniform composition, and a sheet having a thickness of 3 mm was prepared. A strength test was performed on these sheets.
The results are as follows.

[0008] The measuring method is according to JIS K7203.

As described above, the polypropylene resin composition of the present invention exhibits good properties. That is, it is understood that the performance is improved while the amount of the inorganic filler added is half.

[0010]

As is apparent from the above description, the polypropylene resin composition of the present invention contains a pulverized product of a thermosetting resin containing a benzene nucleus. A small amount of polypropylene resin composition can be obtained, and the polypropylene resin can be improved in recyclability and performance.

Claims (1)

[Claims] 1. A polypropylene resin composition comprising a polypropylene resin and a pulverized product of a cured thermosetting resin containing a benzene nucleus.