JPS62197443A - Resin composition - Google Patents

Abstract

PURPOSE:To improve greatly thermal stability during molding and to prevent the resin from scorching in a die, an extruder, a screw, etc., by blending a high-nitrile resin with a metal salt of a fatty acid and an alkaline metal salt and/or zinc oxide and/or zinc hydroxide in a specified ratio. CONSTITUTION:This resin compsn. is obtd. by adding 0.01-1pt.wt. metal salt of a fatty acid and 0.01-1pt.wt. alkaline earth metal salt and/or zinc oxide and/or zinc hydroxide to 100pts.wt. high-nitrile resin. As the alkaline earth metal, magnesium is preferred. As the metal salt of the fatty acid, calcium stearate and magnesium stearate are preferred.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high nitrile resin composition that has excellent thermal stability during molding.

[Conventional technology]

Kojil-IJ resin is a resin with excellent gas barrier properties against oxygen, nitrogen, carbon dioxide, and the like.

Generally, this high grade IJ resin can be subjected to extrusion molding, injection molding, blow molding, etc. in the same manner as other thermoplastic resins by adding a phenol type, phosphorus type, or sulfur type stabilizer.

[Problems that shouting attempts to solve]

However, when the above-mentioned high nitrile resin is molded for a long time in extrusion molding, injection molding, blow molding, etc., the resin adheres and accumulates in the die, inside the extruder, and in some parts of the screw, causing it to deteriorate. There was a problem that caused burning.

For this reason, the inherent gas barrier of high nitrile resin
There was a problem that it damaged the nature of sexuality.

[Means for solving problems]

As a result of intensive studies to solve the above-mentioned problems, the present inventors found that by adding fatty acid metal salts and alkaline earth metal oxides or hydroxides to high-density resin, molding The present invention was achieved by discovering that thermal stability during processing can be greatly improved.

That is, the present invention provides 0.01 to 1 part by weight of a fatty acid metal salt and 0.01 to 1 part of an oxide and/or hydroxide of a metal and/or zinc to 100 parts of a high nitrile resin. It is a high nitrile resin composition prepared by adding parts by weight.

The present invention will be explained in detail below.

The high nitrile resin used in the present invention is a copolymer mainly composed of an unsaturated nitrile compound such as acrylonitrile or methacrylonitrile (methacrylonitrile), and preferably contains 50% by weight or more of the unsaturated nitrile compound.

Examples of comonomers include styrene, butadiene, isoprene, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, etc., and one or more of these may be copolymerized with an unsaturated nitrile compound to form the high secondary compound of the present invention. ) IJJ oil is obtained.

Further, as a high nitrile resin, a mixture of the above copolymer and a rubbery copolymer such as butadiene-acrylonitrile copolymer, butadiene-styrene copolymer, isoprene-styrene copolymer, polybutadiene, polyisoprene, etc.
Copolymerization of a mixture of an unsaturated nitrile compound and the above-mentioned comonomer in the presence of these rubber-like copolymers may also be mentioned, which is more preferred since it has impact resistance.

2) IJJ resin may contain antioxidants, ultraviolet absorbers, antistatic agents, coloring pigments, inorganic fillers such as calcium carbonate and talc, and small amounts of other resins as necessary. I don't mind.

The fatty acid metal salt used in the present invention is preferably calcium stearate or magnesium stearate of higher fatty acids such as oleic acid, stearic acid, and palmitic acid.

In addition, as alkaline earth metal oxides and hydroxides,
Examples include magnesium oxide, barium oxide, calcium oxide, magnesium hydroxide, and barium hydroxide. Among them, magnesium hydroxide and magnesium oxide are preferred.

An important point in the present invention is that a fatty acid metal salt and an alkaline earth metal and/or zinc oxide and/or hydroxide are used together.

Fatty acid metal salts alone have little effect on suppressing burnt formation during molding. Further, even when an oxide and/or hydroxide of an alkaline earth metal and/or zinc is used alone, the effect of suppressing the occurrence of scorching is small.

In contrast, according to the present invention, heat processing stability can be significantly improved only by using fatty acid metal salts, alkaline earth metals, and/or zinc oxides and/or hydroxides in a specified quantitative range. This has been improved, and the occurrence of scorching in dies, extruders, screws, etc. is significantly reduced.

If the amount of fatty acid metal salt added is less than 10 quintillion parts by weight of the resin, the effect of preventing scorching will be small, and if it exceeds 1 part by weight, extrusion stability may be impaired or bleed may occur on the surface of the molded product. I don't like it because it can sometimes happen.

On the other hand, oxides of alkaline earth metals and/or zinc h7
1/ N9 IREKA n)〃(Goln Noodle Shil→・t
=-k II II/f! lIR 1 n
n? The amount is in the range of 0.01 to 1 part by weight per 8 parts of +r, and if it is less than 0.01 part by weight, the effect of suppressing scorching is poor, and if it exceeds 1 part by weight, transparency deteriorates, which is not preferable.

The method for producing the resin composition of the present invention is not limited, but for example, a powder of high-quality l-IJJ resin, a fatty acid metal salt, and an oxide and/or hydroxide of an alkaline earth metal and/or zinc, and in some cases, other materials. The additives are mixed in a mixer rotating at a predetermined g speed, and then melted and kneaded through an extruder to form pellets.

In addition, a masterbatch containing fatty acid metal salts and alkaline earth metal and/or zinc oxides and/or hydroxides together or individually is prepared using IJJ resin as a base, and these are combined with high nitrile resin. It can also be obtained by blending.

Furthermore, when polymerizing a high nitrile resin, it is preferable to add and mix these compounds at the end of the polymerization, since this improves the dispersibility.

〔Example〕

Hereinafter, this will be explained in detail using examples.

Example 1 A high nitrile resin (acrylonitrile content Approximately 75% by weight (based on elemental analysis) per 100 parts by weight of powder, 0.1 parts by weight of calcium stearate;
0.1 part by weight of magnesium hydroxide and 1.0 part by weight of trisnoryl phenyl phosphite as an antioxidant were added, mixed in a Henshil mixer, and then extruded in an extruder at a resin temperature of about 200°C. IJ resin pellets were obtained.

The pellets were transferred to a 3011IIψ extruder (L/D=22)
The extruder temperature was increased to CI (180℃) starting from the hopper side.
), C2 (200°C), C3 (220°C), dice (
Pelletization extrusion was carried out for 2 hours, 4 hours, and 8 hours at an extrusion rate of 5 kf/Hr.

In either case, the resin temperature is approximately 220°C, and the die
No burnt material was observed adhering to the sulphur IJ, -, etc.

Using the obtained pellets, a film with a thickness of 30 μm was formed using a T-die film forming machine at a resin temperature of 200°C, but no pinholes or foreign matter such as scorching were observed, and the appearance was A good film was obtained.

Comparative Example 1 A high nitrile resin was extruded into pellets in the same manner as in Example 1 without adding calcium stearate. As a result, yellowed deposits were observed inside the screw and die after 2 hours of extrusion, and in particular, some of the deposits inside the die were browned.

Using the obtained pellets, the same procedure as in Example 1 was carried out to obtain a thickness of 3
A 0 μm film was formed, but the film was found to contain foreign matter due to burning.

Comparative Example 2 Pelletization and extrusion of a high-quality resin was carried out in the same manner as in Example 1 without adding magnesium hydroxide. As a result, one hour after the start of extrusion, scorch accumulated at the exit of the die, and two hours later, brownish scorch occurred at the tip of the screw inside the die.

Using the obtained pellets, the same procedure as in Example 1 was carried out to obtain a thickness of 3
Although a film of 0 μm was obtained, many foreign substances due to scorching were observed in the film.

Comparative Example 3 A high nitrile resin was extruded into pellets in the same manner as in Example 1, except that 0.1 part by weight of oleic acid amide, which is used as a lubricant in polypropylene, etc., was used instead of calcium stearate and magnesium hydroxide. Ta. As a result, after 4 hours of pelletizing extrusion, scorch adhesion occurred inside the die and on the screw surface.

Using the obtained pellets, the same procedure as in Example 1 was carried out to obtain a thickness of 3
A film of 0 μm was obtained, but the film was found to contain foreign matter due to burning.

Comparative Example 4 Oleic acid amide 0 instead of calcium stearate
．． A high nitrile resin was extruded into pellets in the same manner as in Example 1 except that 1 part was used.

As a result, yellowed deposits were observed inside the screw and die after 4 hours of extrusion.

Using the obtained pellets, the same procedure as in Example 1 was carried out to obtain a thickness of 3
Although a 0 μm film was formed, it was found that a small amount of foreign matter due to scorching was mixed into the film.

Comparative Example 5 Oleic acid amide 0,1 instead of magnesium hydroxide
A high nitrile resin was extruded into pellets in the same manner as in Example 1 except that 100% of the resin was used. As a result, yellowed deposits were observed inside the screw and die after 4 hours of extrusion.

Using the obtained pellets, the same procedure as in Example 1 was carried out to obtain a thickness of 3
A 0 μm film was formed, but the film was found to contain foreign matter due to burning.

Example 2 Pellets of high 2-IJ resin were prepared in the same manner as in Example 1, except that 0.1 part by weight of sodium stearate was used instead of calcium stearate and 0.2 part by weight of magnesium oxide was used instead of magnesium hydroxide. Chemical extrusion was performed. As a result, even after 8 hours of pelletizing extrusion, no burnt material was observed adhering to the die, screw, etc.

Using the obtained pellets, the same procedure as in Example 1 was carried out to obtain a thickness of 3
A film having a thickness of 0 μm was obtained, and the film had a good appearance without contamination with foreign matter.

Example 3 As a high nitrile resin, 10 parts by weight of butadiene-acrylonitrile rubbery copolymer (80% by weight of butadiene), 70 parts by weight of acrylonitrile, and 25 parts by weight of methyl methacrylate were added.
Example 1 except that a high nitrile resin obtained by graft copolymerizing a mixture consisting of 5 parts by weight of styrene and 5 parts by weight of styrene (acrylonyl l-IJ content of about 65 wt% by 1-element analysis) was used.
Pelletization and extrusion of high nitrile resin pellets was carried out in the same manner as above. As a result, even after 8 hours of pelletization extrusion, almost no burnt material was observed to adhere to the die, Sufu'Jz-, etc.

Using the obtained pellets, the same procedure as in Example 1 was carried out to obtain a thickness of 3
Although a 0 μm film was scaled up, no contamination of foreign matter due to scorching was observed, and a film with a good appearance was obtained.

〔Effect of the invention〕

The Koji I-IJ resin composition according to the present invention can be produced by extrusion molding,
Excellent thermal stability during molding processes such as injection molding and blow molding. Therefore, a good molded product can be obtained without impairing the excellent gas barrier properties inherent to the high nitrile resin due to scorching or the like. Furthermore, since there is almost no adhesion of burnt material to dies, screws, etc., the frequency of disassembly and cleaning of the molding machine can be reduced, and productivity can be expected to improve.

Claims (1)

[Claims] 1. 0.01 to 1 part by weight of fatty acid metal salt and 0.01 to 1 part of alkaline earth metal and/or zinc oxide and/or hydroxide per 100 parts by weight of high nitrile resin. A high nitrile resin composition containing 1 part by weight. 2. The high nitrile resin composition according to claim 1, wherein the alkaline earth metal is magnesium.