KR19980025597A - Weather Resistant Polypropylene Resin Composition - Google Patents

Abstract

The present invention relates to a weatherable polypropylene resin composition, and an object thereof is to provide a polypropylene resin composition having improved weather resistance by adding a UV absorber and a radical scavenger compound to a polypropylene resin.

The composition of the present invention is composed of a mixture of polypropylene and a hydroxy benzophenone (Hydroxy Benzophenone) -based compound, which is an ultraviolet absorber, and a Hindered Amine LIght Stabilizer (HALS) compound, which is a radical scavenger It is done.

The polypropylene resin according to the present invention has improved weather resistance without deteriorating other physical properties, and may be used by being molded into various products such as plates, films, containers, and fibers.

Description

Weather Resistant Polypropylene Resin Composition

The present invention relates to a weatherproof polypropylene resin composition, and more particularly, to discoloration caused by light by mixing a hydroxy benzophenone-based compound or a hindered amine-based compound with a steric hindrance to the polypropylene resin. The present invention relates to a polypropylene resin having no physical property change, that is, to a polypropylene resin composition having excellent weather resistance.

Generally, polypropylene is a general-purpose plastic with high strength and excellent mechanical properties, but when exposed to outdoor use, polypropylene causes aging due to the effect of ultraviolet rays from the sun's rays. Due to such problems, there are considerable limitations in the development of the application. Therefore, there is a need for various methods that can solve the above problems by preventing the polypropylene from aging by light.

Japanese Patent Application Laid-Open No. 54-26196 and Japanese Patent Application Laid-open No. 58-142818 describe a method of improving heat resistance and impact resistance by adding a light stabilizer, but have not shown improvement in weather resistance and physical properties.

The present invention is to solve the problems associated with the prior art as described above, by adding a UV absorber and a radical scavenger compound to the polypropylene resin to provide a polypropylene resin composition with improved weather resistance It is for that purpose.

The resin composition of the present invention is characterized in that it is composed of a mixture of polypropylene and an amine benzophenone compound as a UV absorber and an amine light stabilizer compound having steric hindrance as a radical scavenger.

Hereinafter, the present invention will be described in detail.

In the present invention, the term 'polypropylene' refers to a block or irregular copolymer of propylene homopolymer or other α-olefin having 3 to 15 carbon atoms. Examples of other α-olefins include 1-butene, 1-pentene, 1-hexene, and 1-octene. The amount of α-olefin copolymerized with propylene is up to 0-50 mol% per mole propylene.

In the present invention, the hydroxy benzophenone-based compound is substituted with an alkyl (Alkyl) substituent such as octyl, decyl, dodecyl, etc. 2-hydroxy-4-alkoxy benzophenone.

(Aliphatic hydrocarbon of R = C ₂ -C ₃₀ )

In addition, in the present invention, a hindered amine compound having a steric hindrance is 2, 2, 6, and 6-tetramethylpiperidine (2, 2, 6, 6-tetramethylpiperidine) as a basic structure. It is a compound like Structural Formula (II).

(R ₁ , R ₂ = H or C ₁ -C ₃₀ aliphatic hydrocarbon)

Total content of hydroxy benzophenone-based compound and amine-based light stabilizer (HALS) compound having steric hindrance in order to improve the physical properties desired in the present invention without deteriorating other properties of polypropylene It should be 1000-40000 ppm, preferably 1000-10000 ppm per weight of this polypropylene.

In addition, the mixing ratio of the mixed hydroxy benzophenone compound and the amine-based light stabilizer compound having steric hindrance should be 500 to 5000 ppm: 500 to 5000 ppm of the hydroxy benzophenone compound: amine-based light stabilizer compound by weight.

The weatherproof polypropylene resin composition of the present invention is a polymer powder or polymer pellets, such as a polypropylene resin, a hydroxy benzophenone (Hydroxy Benzophenone) -based compound, a hindered Amine Light Stabilizer (HALS) compound having a steric hindrance The polymer powder and other polymer pellets may be prepared by mixing with a Henschel mixer or Brabender.

To the weather-resistant polypropylene resin produced by the above method, an antioxidant, a flame retardant, carbon black, pigments, etc. which are commonly added may be added. Furthermore, the weatherproof polypropylene resin according to the present invention can be used in combination with low density polyethylene, high density polyethylene, polybutene and the like.

Hereinafter, the present invention will be described with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

Weather resistance in the examples of the present invention was measured by the following method.

Test specimens were installed in Sunshine Weather-O-Meter for accelerated weathering test. Carbon-Arc was used as a light source, and black pannel temperature was maintained at 83 ℃ and relative humidity at 50%.

Under the above conditions, the specimens were taken for each time period and weather resistance was evaluated by measuring mechanical properties, color change, and surface state change.

Example 1

Melt Index consists of 30% by weight of a hydroxy benzophenone compound as a UV absorber and 70% by weight of an amine compound having a steric hindrance as a radical scavenger in a polypropylene of 10.0 g / 10 minutes. The mixture was mixed at 3000 ppm per total weight of polypropylene, pelletized by adding an antioxidant phosphite antioxidant and a halogen absorber calcium stearate (Ca-Stearate), followed by melt mixing with an extruder. This pellet was manufactured as a test specimen using an ASTM standard mold in an injection molding machine, and after 600 hours in Sunshine Weather-O-Meter, weather resistance was measured and the results are shown in Table 1.

Example 2

The mixture of the hydroxy benzophenone compound and the amine compound having sterically hindered compound was carried out in the same manner as in Example 1 except that 6000 ppm of the total weight of polypropylene was mixed, and the results are shown in Table 1 below. .

Comparative Example 1

The same procedure as in Example 1 was carried out except that a mixture of a hydroxy benzophenone compound and a sterically hindered amine compound was not used, and the weather resistance thereof was measured and the results are shown in Table 1.

TABLE 1

Weather resistance results (residual property remaining after 600 hours)

The polypropylene resin according to the present invention has improved weather resistance without deteriorating other physical properties, and can not be molded and used in various products such as plates, films, containers, and fibers.

Claims (3)

A weatherproof polypropylene resin composition comprising a mixture of polypropylene and a hydroxy benzophenone compound and a hindered amine light stabilizer compound (HALS). The total content of the mixture of the hydroxy benzophenone (Hydroxy Benzophenone) compound and the sterically hindered amine light stabilizer (HALS) compound is 1000-40000 ppm by weight of polypropylene. Weather resistant polypropylene resin composition characterized by the above-mentioned. The weathering polypropylene resin composition according to claim 1, wherein the polypropylene is a homopolymer of propylene or a block or irregular copolymer with other α-olefins having 3 to 15 carbon atoms.