JPH04185659A - Polypropylene resin bumper material - Google Patents

Abstract

PURPOSE:To obtain a polypropylene resin bumper material which is stable against light and improved in bleeding in molding by adding specified additives to a polypropylene resin composition containing an alpha-olefin copolymer rubber and an inorganic filler. CONSTITUTION:A polypropylene resin bumper material is obtained by adding 0.01-1 pt.wt., desirably 0.02-0.5 pt.wt. hindered piperidine compound of the formula and 0.01-1.5 pts.wt., desirably 0.02-1 pt.wt. metallic soap or higher fatty acid lubricant (particularly desirably a metal stearate or stearic acid) to 100 pts.wt. polypropylene resin composition containing 5-40wt.%, desirably 5-30wt.% alpha-olefin copolymer rubber and 5-40wt.%, desirably 5-50wt.% inorganic filler (desirably of a mean particle diameter of 20mum or below, desirably 5mum or below).

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a bumper material made of polypropylene resin containing an α-olefin copolymer rubber and an inorganic filler. More specifically, the present invention relates to a polypropylene-based 11]1 bumper material that has improved bleedability during molding and processing and is also stable against light.

[Prior Art] Polypropylene resins have excellent physical, chemical, and electrical properties and are therefore useful as materials for fibers, molded products, sheets, films, etc.; In order to improve impact resistance, rigidity, heat distortion temperature, or dimensional stability, α-olefin copolymer rubber and inorganic fillers are often mixed and used in automobile parts and parts of electrical products. .

Particularly recently, the use of polypropylene resin bumpers containing α-olefin copolymer rubber and inorganic fillers has been remarkable due to their excellent design properties. in this case,
It is important to prevent deterioration due to light, and screws (2,
A method of adding a hindered piperidine compound such as 2,6,6-tetramethyl-4-piperidyl sebacate is preferably used.

On the other hand, bumpers are required to have a complex design surface, and a lubricant is required to adjust the slippage between the polypropylene resin and the surface of the processing machine, and to improve the peelability between the molded product and the mold surface. It is said that It is well known that metal soap-based or higher fatty acid-based compounds are useful as lubricants5).

However, if a hindered piperidine compound added for photostabilization and a metal soap-based or higher fatty acid-based lubricant containing an acidic component coexist, there will be a problem between the two during the processing process. Possibly due to the formation of salt, a "IJ-r" substance was generated on the surface of the molded product, causing problems such as a decrease in paintability.

JP-A-63-122752 discloses that coating properties can be improved by using a hindered amine organic compound having an amine value of 5.2 or less. but,
As exemplified in this publication, such hindered amine organic compounds are generally high molecular weight hindered amine compounds, and their photostabilizing performance is not necessarily sufficient.

[Problems to be Solved by the Invention] Therefore, there has been a strong desire for a polypropylene resin bumper material that has improved pull properties during molding and is also stable against light.

An object of the present invention is to provide a polypropylene resin bumper material that has improved bleedability during molding and processing and is stable against light.

Another object of the present invention is to stabilize a polypropylene bumper material containing an α-olefin copolymer rubber and an inorganic filler by incorporating specific additives into the bumper material.

[Means for Solving the Problem] As a result of intensive research to solve the problem, the present inventors have found that a specific hindered piperidine compound can be used in combination with a metal soap-based or higher fatty acid-based lubricant. The inventors have discovered that this method can suppress the bleeding that tends to occur when molding polypropylene resin bumper materials, and can also provide sufficient stability against light, leading to the present invention.

That is, the present invention provides α-olefin copolymer rubber 5 to
(A) 0.01 to 1 part of a hindered piperidine compound represented by the following formula (1) to 100 parts by weight of a polypropylene resin composition containing 40% by weight and 5 to 40% by weight of an inorganic filler.
parts by weight, and <8) Kanebe soap-based lubricant: higher fatty acid-based lubricant 0.
A polypropylene resin bumper material containing 01 to 1.5 parts by weight is provided.

The present invention also provides a polypropylene resin composition containing the above-described α-olefin copolymer rubber and an inorganic filler, and a hindered piperidine compound represented by the forward bending formula CI), and a metal stone cocoon thread or A method for stabilizing a polypropylene resin bumper material by blending a higher fatty acid-based lubricant is provided.

In the present invention, the base polypropylene is not only a homopolymer of propylene, but also a copolymer mainly composed of propylene and containing an ethylene component, such as a propylene-ethylene block copolymer, a block copolymer of propylene and ethylene-propylene rubber, etc. It may also be a combination. Among these, the latter block copolymer containing an ethylene component is preferred. When using a copolymer containing an ethylene component, the ethylene component is usually contained in an amount of 20% by weight or less based on the weight of the copolymer. The polypropylene resin targeted in the present invention further contains an α-olefin copolymer rubber and an inorganic filler in addition to such polypropylene.

The α-olefin copolymer rubber referred to here is a rubber-like polymer obtained by copolymerizing two or more types of α-olefins. There are 12 of them. Among α-olefin copolymer rubbers, copolymer rubbers of ethylene and other olefins are preferred. ,
Specifically, j-mafropyrene, 1-butene, 1-pentene,
Examples include 1-hexene, 4-methyl-1-pentene, 1-octene, and mixtures thereof.

Among them, propylene or 1-butene is preferable.When a copolymer rubber of ethylene and other α-olefin is used, the ethylene content in the copolymer rubber is 45%.
The range is preferably about 95% by weight, more preferably 5% by weight.
It is about 0 to 80% by weight. Also, α which is the subject of the present invention
- In the olefin copolymer rubber, a linear or cyclic polymer having a non-conjugated double bond as a third component, such as 5
-Ethylidene-2-norbornene, non-clopentadiene, etc. copolymerized are also included.

The mixing ratio of α-olefin copolymer rubber to polypropylene is 5% based on the weight of the mixture of polypropylene, α-olefin copolymer rubber, and inorganic filler.
-40% by weight, preferably 5-30% by weight. If it is less than 5% by weight, the impact resistance will be poor, and if it exceeds 40% by weight, problems will arise in moldability and the like.

The inorganic fillers used in the present invention include talc, carbon bullion, titanium oxide, zinc oxide, aluminum hydroxide, cal/rum carbonate, magnonium carbonate, calumium sulfate, barium sulfate, caluminum poppyrate, ( Seven grams of sulfate, micas, celite, kaolin, zeolite,
Silica, asbestos, glass! a fiber, carbon blur,
Examples include titanic 21m fiber, barium titanate, lead titanate, and each of these can be used alone or in combination of two or more. These inorganic fillers preferably have an average particle size of 20 μm or less, more preferably 5 μm or less.

The blending ratio of the inorganic filler to polypropylene is 5 to 40% by weight, preferably 5 to 30% by weight, based on the weight of the mixture of polypropylene, α-olefin copolymer rubber, and inorganic filler. If it is less than 5% by weight, the rigidity will be poor, and if it exceeds 40% by weight, problems will arise in impact resistance, etc.

In the present invention, the aforementioned hindered piperidine compound (A) and lubricant (B) are blended into the polypropylene resin containing the α-olefin copolymer rubber and inorganic filler as described above.

The hindered piperidine compound (A) used in the present invention is represented by the above formula (1), and its chemical name is:
2-Methyl-2-(2,2,6,6-tetramethyl-4
-piperidyl)amino-N-(2,2,6,6-tetramethyl-4-piperidyl)propionamide.

Among the lubricants (B) used in the present invention, specific examples of metal soap-based lubricants include metal salts of stearic acid such as carunium stearate, zinc stearate, and aluminum stearate.

Specific examples of higher fatty acid lubricants include stearic acid, hydroquine stearic acid, behenic acid, and linoleic acid. Among these lubricants, metal salts of stearic acid or stearic acid are particularly preferred.

In the bumper material of the present invention, 0.01 of the hindered piperidine compound (A) is added to 100 parts of the polypropylene resin composition containing the α-olefin copolymer rubber and an inorganic filler. ~1 part by weight, preferably 0
．． 02 to 0.5 parts by weight of the lubricant (8).
0.01 to 1.5 parts by weight, preferably 0.02 to 1 part by weight. The hindered piperidine compound (A) is 0
If less than 1 part by weight is added, sufficient weather resistance cannot be obtained, and even if more than 1 part by weight is added, an improvement in weather resistance commensurate with the amount used cannot be expected. (B) If the lubricant is added in an amount of 0.01 part by weight without soaking, a sufficient effect will not be obtained, and if added in excess of 1.5 parts by weight, it will adversely affect the processing process, such as increasing bleeding. bring about.

The bumper material of the present invention includes:
Other additives, such as antioxidants, heat stabilizers, light stabilizers, flame retardants, nucleating agents, organic and inorganic pigments, antistatic agents,
A metal deactivator or the like may be used in combination.

Examples of antioxidants that may be used in combination include phenolic secondary antioxidants, sulfur secondary antioxidants, and phosphorus secondary antioxidants.

Examples of phenolic antioxidants include 2,6-di-tert-butyl-4-methylphenol, tetrakis[methylene-3-(3,5-dibutyl-4-hydroquinphenyl)propionate] Methane, n-octadenyl 3-(3,5-di-1-butyl-4
-hydroquinphenyl)propionate, tris(3,
5-di-t-butyl-4-hydroquinophenyl)yne annulate, 3.9-bisf'2-(3-t-butyl-4-hydroquine-5-methylphenyl)propionyloxy)-1
, 1-dimethylethyl]-2,4°8.10-tetraoxaspiro[5,5-oundecane, etc.

Examples of sulfur-based secondary antioxidants include tetrakis[methylene-3-(laurylthio)propionate comethane, dilauryl 3,3'-thiodipropionate, simiristyl 3,3'-thiodipropionate, and dilauryl 3,3'-thiodipropionate. Stearyl 3,3'-thiodipropionate, 3,9-bis(
Examples include 2-laurylthioethyl)-2゜4.8.10-tetraoxaspiro[5.5]undecane.

Furthermore, as an example of a phosphorus-based secondary antioxidant, tris (2
,4-di-t-butylphenyl) phosphite, bis(2,4-di-t-butylphenyl) pentaerythritol siphosphite, bis(2,6-di-t-butylphenyl)
-butyl-4-methylphenyl) pentaerythritol siphosphite, distearyl pentaerythritol siphosphite, tetrakis (2,4-di-t-butylphenyl)4.
Examples include 4'-bisphenylene diphosphonite.

Examples of heat stabilizers that may be used in combination include 2-t-butyl-6-(3-t-butyl-2-hydroquine-5-methylbenzyl)-4-methylphenyl acrylate, 2-N-(2- Examples include hydroquine-3,5-di-t-bentylphenyl)ethylni-4,5-the-t-bentylphenyl acrylate.

Examples of J1 light stabilizers that may be used in combination include 2-(3
-t-butyl-2-hydroxy/-5-methylphenyl)
-5-chlorobenzotriazole, 2-(3,5-di-t-butyl-2-and doroquinphenyl)benzotriazole, 2-(2-hydroxy-5-methylphenyl)benzotriazole, 2-hydroquine-4 -octyloquine benzophenone, 2-hydroxy-4-methquine benzophenone, 2.4
-di-t-butylphenyl 3.5-di-t-phthyl-4-hydroquine benzoate, 2.2'-thiobis(4
-octylferrate)-2-ethylhexyl-aminenickel, ethyl 2-cyano-3,3-diphenylacrylate, poly[(6-(1,1,3,3-tetramethylbutyl)
imino-1,,3,5-) riazine-2゜4-/yl)
((2,2,6,6-tetramethyl-4-piperidyl)
imino) hexamethylene ((2,2,6,6-tetramethyl-4-piperidyl)imino)], poly[(6-morpholino-1,3,5-)riazine-
2,4-diyl)((2,2,6,6-tetramethyl-
4-piperidyl)imino)hexamethylene ((2,2,
6,6-tetramethyl-4-piperidyl)imino)], polycondensation of dimethyl succinate and 1-(2-hydroquinethylsine-4-hydroquine-2,2,6,6-titramethylbiveridine) Examples include hardware.

Examples of flame retardants that may be used in combination include tetrabromobisphenol A1 decabromodiphenyl oxide, antimony trioxide, and aluminum hydroxide.

Nucleating agents that may be used in combination include, for example, atrium benzoate, p-ethylbenzylidene sorbitol, sodium
Examples include di(4-1-butylphenyl)funasphite.

Examples of nurturing pigments that may be used in combination include polycyclic pigments such as phthalocyanine, quinacridin, perylene, anthraquinone, and isoindolinone, and examples of inorganic pigments include titanium white, titanium yellow,
Examples include iron oxide and cadmium red.

Examples of antistatic agents that may be used in combination include polyoxine ethylene alkylamine, polyoxine ethylene alkylamide, glycerin fatty acid ester, and the like.

For example, N,
N'-bis! -(3,5-di-t-butyl-4-hydroquinphenyl)propionyl]hydrazine, dodecanedioic acid bisr2-(2-hydroquinbenzoyl)hydrazide], and the like.

In producing the polypropylene resin bumper material of the present invention: For example, after mixing using a Henschel mixer, etc., kneading is performed using a roll, Banbury Mixer 1 single screw extruder, twin screw extruder, etc. to form pellets. A method of molding the resulting resin into a predetermined shape by a conventional molding method such as injection molding or extrusion molding can be adopted. The hindered piperidine compound (A) used in the present invention, the metal soap-based or higher fatty acid-based lubricant (B), and various additives that are optionally added to Narobi can be added at any stage of the manufacturing process of these products. can be added separately or simultaneously.

[Examples] The present invention will be explained in more detail with reference to Examples, but the present invention is not limited thereto.

In addition, % and parts in the examples are as follows unless otherwise specified.
All values are based on weight.

Example 1 Ethylene-propylene copolymer comb (ethylene content 75
%), 10% talc, and unstabilized propylene-ethylene block copolymer (ethylene content 7.
Polypropylene resin composition 1 consisting of 65% of
Using 00 parts of straw, each component shown in Table 1 was added thereto, mixed in a Henschel mixer, further kneaded in a 30 mmφ twin-screw extruder, and pelletized.

Using the obtained pellet, a bumper was molded using an injection molding machine, and the surface was visually observed to determine the presence or absence of bleed material. In addition, the mold releasability was determined by the pressure required to release the bumper from the mold, and the air pressure was 5 kgic+i/
If it was less than "am", it was considered good, and if it was more than that, it was considered bad.

On the other hand, using the pellet obtained in the same manner as above, a test piece of 6[IX40x1 mto] was prepared by injection molding and subjected to a weather resistance test. The weather resistance test was carried out using a Sanya Inn Weather Meter, with a black panel temperature of 83°C and a water spray cycle of 18 minutes/I20 minutes.The surface of the test piece was observed every 60 hours. The time it takes for cracks to appear (crack life) was measured, and a measure of photostabilization was obtained.

The results are shown in Table 1.

In addition, the symbols of the test compounds in Table 1 respectively mean the following.

^0-1= Tetrakis [methylene-3-(3,5
-di-t-butyl-4-hydroxyphenyl)propionate tumethane 0VA-1+ 2- (3-t-butyl-2-hydroxy-5-methylphenyl)-5-chlorobenzotriazole (1): 2- Methyl-1-(2,2,6,6-tetramethyl-4-piperidyl)amino-N-(2,2,
6,6-tetramethyl-4-piperidyl)propionamide) IALS-1: Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate HALS-2: PolyC(6-(1,1, 3,3
-tetramethylbutyl)imino-1,3,5-triazine-2,4-diyl)((2°2.6.6-tetramethyl-4-piperidyl)imino)hexamethylene((2°2.6. 6-tetramethyl-4-piperidyl)imino)
: Ni-1, Carunium stearate\, Table 1 [Effects of the invention] The polypropylene resin bumper material of the present invention has improved bleedability during molding and processing, and is also stable against light. .

Claims (3)

[Claims] (1) For 100 parts by weight of a polypropylene resin composition containing 5 to 40% by weight of α-olefin copolymer rubber and 5 to 40% by weight of an inorganic filler, (A) The following formula ▲ Numerical formula, chemical formula, There are tables, etc. 0.01 to 1 part by weight of the hindered piperidine compound shown in ▼ and (B) 0.01 to 1 part of a metal soap-based or higher fatty acid-based lubricant.
A polypropylene resin bumper material containing 1.5 parts by weight. (2) The bumper material according to claim 1, wherein the lubricant is a metal salt of stearic acid or stearic acid. (3) For a polypropylene resin composition containing 5 to 40% by weight of α-olefin copolymer rubber and 5 to 40% by weight of an inorganic filler, (A) The following formula ▲ Numerical formula, chemical formula, table, etc. A method for stabilizing a polypropylene resin bumper material, which comprises adding a hindered piperidine compound represented by ▼ and (B) a metal soap-based or higher fatty acid-based lubricant.