JPS5947704B2 - Polyolefin stabilized composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to polyolefin stabilizing compositions.

To explain in more detail, the general formula -Iyu~-.

CH3HCH3 [1] (n is | Indicates an integer of 2 or 3.

R is alkyl, cycloalkyl, aralkyl, aryl when n is 1; alkylene, arylene when n is 2;
arylene dialkylene, and when n is 3, it represents alkantriylarenetriylarenetriyltrialkylene.

), the piperidine derivative (2), the 2,6-layer di-tert-butyl-4-methylphenol (B) and the thiodialkanoic acid ester (C), when A=2, 0
The present invention relates to a polyolefin stabilized composition containing a weight ratio of <B<11, 0<C<2.

Polyolefins such as polyethylene and polypropylene are susceptible to deterioration due to the effects of ultraviolet rays, heat, oxygen, etc.
Therefore, it is essential to add various UV stabilizers and antioxidants to polyolefins. Generally, various UV stabilizers and antioxidants are used in combination to stabilize polyolefins, but the present invention was developed as a result of repeated research on stabilizing polyolefins by using various UV stabilizers and antioxidants in combination. The present invention was completed by recognizing that the composition of the invention exhibits extremely excellent stabilization of polyolefins. When the piperidine derivative represented by the general formula [I] is added alone to a polyolefin, it imparts excellent light resistance to the polyolefin, but it exhibits almost no heat resistance effect. -When added in combination with methylphenol or thiodialkanoic acid ester, the light resistance effect is significantly inferior.

Further, when these compounds and 2,6-ditertiary butyl-4-methylphenol are used in combination, the polyolefin has the disadvantage of yellowing. 2,6-ditertiary butyl-4
- When methylphenol and thiodialkanoic acid ester are used in combination, heat resistance effect is imparted to polyolefin, but light resistance effect is hardly observed.

The present invention improves the disadvantages of polyolefins when each of them is used alone or in combination, and provides a polyolefin stabilized composition that has the best overall light resistance, heat resistance, and yellow resistance by combining the three. It is. In the polyolefin stabilizing composition of the present invention, examples of the compound represented by the general formula [1] include 14-acetoxy-2,2,6,6-
Tetramethylpiperidine, 4-(phenylacetoxy)
-2,2,6,6-tetramethylpiperidine,4-cyclohexanoyloxy-2,3,6,6-tetramethylpiperidine,4-benzoyloxy-2,2,6,6-
Tetramethyl 2-piperidine, 4-(0-toluoyloxy)-2,2,6,6-tetramethylpiperidine, bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis(2, 2,6,6-tetramethyl-4-
piperidyl) terephthalate, tris(2,2,6,6
-tetramethyl2-4-piperidyl)benzene-1,3
, 5-tricarboxylate, but is not limited to these compounds.

Typical thiodialkanoic acid esters include, for example, distearylthiodipropionate, dilaurylthiodipropionate, 3-dimyristylthiodipropionate, and diisobutylthiodipropionate. In addition to polyethylene and polypropylene, the polyolefins stabilized by the stabilizing composition of the present invention include 1-butene, 1-benzene, 3-
Methyl-1-butene, 1-hexene, 4-methyl-1-
Polymers such as benzene, 4-methyl-1-hexene, 4,4-dimethyl-1-benzene, butadiene, isoprene, or ethylene-propylene, ethylene-benzene,
Examples include copolymers such as styrene-butadiene.

The amount of the stabilizing composition of the present invention is appropriately selected depending on the properties of the polyolefin, the purpose of use, etc.
Usually 0.05-4.0% (weight), preferably 0.10
~2% (by weight).

The stabilized composition of the present invention may be blended with fillers used in other polyolefins.

The compounding method to the polyolefin can be carried out by any suitable method. For example, it may be added and kneaded on a heated roll,
Alternatively, the mixture may be mixed with a suitable kneading device, or dissolved or dispersed in a suitable solvent that can be easily removed, and after the solvent is removed, it may be melted into pellets. Next, the effects of the present invention will be specifically explained using examples.

Example 1 The stabilizer shown in Table 1 was dissolved and added to polypropylene (MI-5) powder in acetone, the acetone was evaporated, and after mixing,
Extrude into pellets using a screw type extruder at 230°C, then use an injection molding machine at 200°C to a thickness of 0.8
A test piece of m1L was prepared.

A light resistance test is performed on the test piece in a fade tester (black panel temperature: 60±3°C), and the time until cracks appear on the surface of the test piece is measured. At the same time, 150℃
Yellow resistance is measured by visually observing the embrittlement time in a gear oven and the appearance of the test piece when it is prepared. Example 2 A stabilizer is added to and mixed with polypropylene (MI=5) powder in the same manner as in Example 1, and the light resistance, heat resistance, and yellow resistance of the test pieces prepared are measured.

Riazole Example 3 The following stabilizer was mixed with high-density polyethylene produced by low-pressure polymerization, and extruded at 200°C using a screw type extruder.
Formed into a pellet, then molded using an injection molding machine at 190°C to a thickness of 0.8
Create a 1 Lm test piece.

Claims (1)

[Claims] 1 General formula ▲ Numerical formula, chemical formula, table, etc. ▼ (n represents an integer of 1, 2, or 3. When n is 1, R represents alkyl, cycloalkyl, aralkyl, aryl, Piperidine derivatives (A
) and 2,6-layer ditertiary-butyl-4-methylphenol (
B) and thiodialkanoic acid ester (C) are A
A polyolefin stabilized composition containing a weight ratio of 0<B≦1 and 0<C≦2 when =2.