KR100894276B1 - Polyprophilene resin composition with advanced tensile strength and weather proof property - Google Patents

Abstract

A polypropylene resin composition with inorganic filler and UV stabilizer is provided for outdoor components of automobile and electronic appliance by showing heat resistance and tensile strength. A polypropylene resin composition with inorganic filler and UV stabilizer comprises the 40.0~98.99wt% of polypropylene, the 1.0~50.0wt% of silica with 1~15 micron of average particle diameter and the 0.01~10.0wt% of UV stabilizer. The polypropylene indicates ethylene-propylene copolymer and polypropylene homopolymer with 1~50g/10min(230°C) of melt index. The UV stabilizer is selected from the group consisting of benzotriazole, sebacate, benzophenone and poly-{[[6-(1,1,3,3-tetramethylbutyl)-imino]-1,3,5-triazino-2,2-diyl][2-(2,2,6,6-tetramethylpiperidyl)-amino]-hexamethylene-[4-(2,2,6,6-tetramethylpiperidy)-imino]}.

Description

Polypropylene resin composition excellent in tensile properties and weatherability {POLYPROPHILENE RESIN COMPOSITION WITH ADVANCED TENSILE STRENGTH AND WEATHER PROOF PROPERTY}

The present invention relates to a polypropylene resin composition having excellent tensile properties and weather resistance, and more particularly, to a polypropylene resin composition composed of a polypropylene resin, an inorganic filler such as silica, and a UV stabilizer.

Although polypropylene resin is a general-purpose resin, it has excellent mechanical properties and moldability, and thus has a wide range of industrial applications such as automobile interior parts, home appliance parts, and industrial materials. In particular, in recent years, the air conditioner outdoor unit or outdoor speaker housing, which has been applied to steel, has recently been replaced with a polypropylene injection molding which is easy to form and assemble. However, polypropylene has shown the limitation of expanding its use due to large shrinkage rate, deformation and lack of rigidity.

In order to improve this problem, inorganic fillers such as talc, calcium carbonate (CaCO3), and mica have been added to prevent deformation, but tensile properties, especially elongation, of tensile strength, such as air-conditioning grills, are important. As thermal degradation becomes a problem, even when an inorganic filler having excellent tensile properties is added, it is necessary to develop a polypropylene having excellent deformation and heat resistance and improved tensile properties by developing a polypropylene having excellent weather resistance.

The present invention devised to solve the above problems is excellent in heat resistance and tensile properties by including silica to enable the tensile properties, in particular, elongation of the polypropylene to prevent the degradation of the tensile properties, which was a problem when the inorganic filler is added to the outdoor of automotive and electrical and electronic products It is an object of the present invention to provide a polypropylene resin composition having excellent tensile properties and weather resistance suitable for use as a component material.

Another object of the present invention is to provide a polypropylene resin composition having excellent weather resistance by including a UV stabilizer.

Polypropylene resin composition excellent in the tensile properties and weather resistance of the present invention for achieving the above object includes a polypropylene, silica and UV stabilizer.

In addition, it is characterized in that 40.0 to 98.99% by weight of polypropylene, 1.0 to 50.0% by weight of silica, and 0.01 to 10.0% by weight of UV stabilizer to the whole composition.

In addition, the polypropylene has a melt index of 1 to 50 g / 10 min (230 ° C.) and is characterized in that the propylene homopolymer and ethylene-propylene copolymer having crystallinity.

In addition, the silica is characterized in that the average particle diameter of 1 ~ 15㎛.

In addition, the UV stabilizer is a benzotriazole-based, 'bis- (2,2,6,6-) represented by 2- (2'-hydroxy-3'-tert-butyl-5-methylphenyl) -5-chloro-benzotriazole Sebacate type represented by tetramethyl-4- piperidinyl) sebacate, benzophenone type represented by '2-Hydroxy-4-n-octylocy benzophenone,' poly-{[(6- (1,1,3,3-tetramethylbutyl ) -imino] -1,3,5-triazino-2,2-diyl] [2- (2,2,6,6-tetramethylpiperidyl) -amino] -hexamethylene- [4- (2,2,6,6 -tetra methylpiperidy) -imino]}, poly [(6-morpholino-s-triazine-2,4-diyl) [2,2,6,6-tetramethyl-4-piperidyl) imino] -hexane [) 2,2 , 6,6-tetramethyl-4-piperidyl) imino]] is characterized in that a mixture of one or two or more selected from the group consisting of.

In addition, the composition is characterized in that it comprises a heat stabilizer, weather stabilizer, antistatic agent, lubricant, slip agent, flame retardant, pigment and / or dye.

As described above, according to the present invention, the polypropylene resin composition having excellent tensile properties and weather resistance can provide a polypropylene resin composition having excellent elongation, in particular tensile properties, and good weatherability, and is widely used in automobiles, air conditioner outdoor unit housings, and outdoor speakers. It is suitable for use in home appliances and industrial parts that require high weatherability and tensile properties used in outdoor such as housing.

(A) polypropylene

The polypropylene resin used in the present invention has a melt index (MI) of 1 to 50 g / 10 min (ASTM D1238, 230 ° C), and preferably a polypropylene polymer and an ethylene-propylene copolymer having crystallinity. Specifically, ethylene-propylene copolymers in which homopolypropylene and ethylene-propylene copolymers polymerized only with propylene are mixed with 0.1 to 30 wt% are preferable.

If the melt index is less than 1g / 10min, moldability of parts may not be good, which may result in molding defects.If the melt index exceeds 50g / 10min, the impact strength is sharply lowered, so that harsh products such as outdoor use are used. Not suitable for conditions

The content of polypropylene includes 40.0 to 99.9 wt%. If it is less than 40.0% by weight, the workability is lowered and molding is difficult. If it exceeds 99.0% by weight, it is not preferable because it is not different from general polypropylene.

(B) silica

In the present invention, the inorganic filler is silica.

In the case of silica, it is preferable to use a product having an average particle diameter of 1 to 15 µm in consideration of appearance and workability. If the average particle diameter is less than 1㎛ to fly like a fine powder in the mixing process may be a problem of proper content control and dispersibility, if it exceeds 15㎛ the appearance of the molded article is poor.

In addition, the silica content includes 1.0 to 50.0% by weight. When the content is less than 1.0% by weight, the effects of stiffness expression and shrinkage improvement are insufficient. When the content is more than 50.0% by weight, extrusion workability is poor and the appearance is not good.

(C) UV stabilizer

UV stabilizers used in the present invention are used to improve the weather resistance of polypropylene, for example, represented by 2- (2'-hydroxy-3'-tert-butyl-5-methylphenyl) -5-chloro-benzotriazole Benzotriazole type; sebacate systems represented by bis- (2,2,6,6-tetramethyl-4-piperidinyl) sebacate; Benzophenone type represented by "2-Hydroxy-4-n-octylocy benzophenone; 'poly-{[(6- (1,1,3,3-tetramethylbutyl) -imino] -1,3,5-triazino-2,2-diyl] [2- (2,2,6,6-tetramethylpiperidyl ) -amino] -hexamethylene- [4- (2,2,6,6-tetra methylpiperidy) -imino]}, poly [(6-morpholino-s-triazine-2,4-diyl) [2,2,6 , 6-tetramethyl-4-piperidyl) imino] -hexane [) 2,2,6,6-tetramethyl-4-piperidyl) imino]] and one or more selected from the group consisting of.

The amount of UV stabilizer is preferably 0.01 to 10.0% by weight. When the content of the UV stabilizer is less than 0.01% by weight, the anti-oxidation effect of the polymer is insufficient to improve the weather resistance, and when it exceeds 10.0% by weight, the commercialization is insufficient due to the cost increase, which may result in property deterioration.

In addition to the polypropylene resin composition of the present invention, various conventional additives such as heat stabilizers, weather stabilizers, antistatic agents, lubricants, slip agents, flame retardants, pigments, dyes, and the like may be added within a range not departing from the characteristics of the present invention.

As a method for producing the polypropylene resin composition of the present invention, kneading using a twin screw extruder is preferable, and mixing at a polypropylene melting point or more is also possible using processing conditions for producing a generally known polypropylene resin composition.

The present invention can be understood in more detail by the following examples, the following examples are intended to help explain the present invention, the protection scope of the present invention is not limited to the scope of the following examples.

Example  And Comparative example

 Table 1 shows the physical properties of the polypropylene resin compositions prepared according to the contents of the components and the examples for the comparative examples.

(Unit: parts by weight)
* 1) Polypropylene: Highly crystalline polypropylene, Samsung Total, Melt index (MI): 1 ~ 50g / 10min

2) Inorganic Filler:

 -Silica: High purity natural crystalline silica, KOSEM, average particle size 2 ~ 4㎛

-Talc (Magnesium silicate hydrate): KOCH, average particle size 3-12㎛, specific gravity 2.7 ~ 2.9 g / cm 3

3) UV stabilizer: Benzotriazole compound and sebacate compound, CIBA GEIGY

In the ingredients and blending ratios of Table 1, polypropylene, silica, talc and UV stabilizers, and other additives are dry blended with a Henschel mixer, and then all are added to the hopper of the JSW TEX44 Alpha (ALPHA) twin-screw kneading extruder at once. After melting and kneading together in an extruder to produce a copper resin composition, it is injected into Samsung Kleukner FCM-110 (molding force = 110 tons) to produce specimens specified in ASTM standards, and tensile strength, elongation, flexural modulus, impact strength and discoloration. Was measured.

In addition, for evaluation of light resistance, annealing for up to 3000 hours at Weather-O-Meter was performed to measure changes in physical properties such as tensile strength, Izod impact strength and discoloration.

Property evaluation method

 1) Tensile strength and elongation

 It was measured at room temperature by the method of ASTM D638.

 2) impact strength

 It was measured at room temperature by the method of ASTM D256.

 3) degree of discoloration

  Delta E was measured with a color meter.

 4) Shrinkage

  Shrinkage was measured by molding a 3mmt x 90mm x 300mm sheet.

As can be seen in Table 1, the elongation of the comparative example 1 to which Talc was applied was significantly lowered, and when the UV agent was not prescribed as in Comparative Example 2, physical properties could not be measured by oxidation during W-O-M annealing.

In addition, in the case of Comparative Example 3, in which the inorganic filler was not added, the elongation was maintained high, but the deformation was severely generated because of the large shrinkage.

Claims (6)

Polypropylene, average particle diameter of 1 ~ 15㎛ Polypropylene resin composition excellent in tensile properties and weather resistance, including silica and UV stabilizer. The polypropylene resin having excellent tensile properties and weather resistance according to claim 1, wherein 40.0 to 98.99% by weight of polypropylene, 1.0 to 50.0% by weight of silica, and 0.01 to 10.0% by weight of UV stabilizer are included. Composition. The polypropylene resin according to claim 1, wherein the polypropylene has a melt index of 1 to 50 g / 10 min (230 ° C.) and is a propylene homopolymer and an ethylene-propylene copolymer having crystallinity. Composition. delete According to claim 1, wherein the UV stabilizer is a benzotriazole type, represented by 2- (2'-hydroxy-3'-tert-butyl-5-methylphenyl) -5-chloro-benzotriazole, 'bis- (2,2, Sebacate type represented by 6,6-tetramethyl-4-piperidinyl) sebacate, benzophenone type represented by '2-Hydroxy-4-n-octylocy benzophenone,' poly-{[(6- (1,1,3 , 3-tetramethylbutyl) -imino] -1,3,5-triazino-2,2-diyl] [2- (2,2,6,6-tetramethylpiperidyl) -amino] -hexamethylene- [4- (2,2 , 6,6-tetra methylpiperidy) -imino]}, poly [(6-morpholino-s-triazine-2,4-diyl) [2,2,6,6-tetramethyl-4-piperidyl) imino] -hexane [ ) 2,2,6,6-tetramethyl-4-piperidyl) imino]] polypropylene resin composition excellent in tensile properties and weather resistance, characterized in that one or two or more selected from the group consisting of. The polypropylene resin composition of claim 1, wherein the composition comprises a heat stabilizer, a weather stabilizer, an antistatic agent, a lubricant, a slip agent, a flame retardant, a pigment, and / or a dye.