JPH0873770A - Granulated composition of inorganic powder for resin filling - Google Patents

Abstract

PURPOSE: To improve the reinforcing effect and handleability of an inorg. powder for resin filling and prevent dusting of the powder by compounding it with a sodium alkanesulfonate and granulating the resulting compsn. CONSTITUTION: 100 pts.wt. inorg. powder for resin filling is compounded with 10--50 pts.wt. sodium alkanesulfonate and the resulting compsn. is granulated, The powder pref. comprises at least one powder selected from among talc, calcium carbonate, barium sulfate, mica. kaolin, titanium dioxide, silica, zeolite, and sepiolite and has an average particle size of 0.1-20μm. Sodium alkanesulfonate having a rather high softening point or m.p. and the number of carbon atoms of 11-18 is pref. For kneading and granulating the powder and the alkanesulfonate, a melt kneader such as an extruder or a pressure kneader usually used for melting and kneading a resin can be used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a granulation composition for resin-filling powder.
It is used as an inorganic filler masterbatch that imparts an antistatic function to a thermoplastic resin having a molding temperature of 350 ° C. or lower while improving its mechanical and thermal properties.

The resin containing the granulating composition of the present invention can be used for producing industrial parts such as home electric appliance parts, OA equipment parts, automobile parts, etc., which are not susceptible to dirt due to dust adhesion, films and the like and transparent films.

[0003]

2. Description of the Related Art Inorganic powder for resin filling is blended with resin for the purpose of improving the mechanical properties of resin, whitening, and imparting gloss. This compound is generally supplied as a powder from a hopper attached to an extruder (single-screw extruder, twin-screw extruder, etc.) via a weighing machine, and kneaded with the molten resin by the extruder. It is taken. When handling powders during this blending, powdering naturally occurs, which causes problems such as deterioration of working environment and contamination of other products.Therefore, by restricting the handling place, isolating, or devising automation, Measures are taken to prevent work environment deterioration and product contamination. Further, when the inorganic powder remains in the hopper and the grade or type of the inorganic powder is changed to manufacture another product, the inside of the hopper, the supply line, and the like need to be cleaned after each change. In a large-sized machine, a person enters the hopper for cleaning, and disassembly and cleaning is required for both large-sized machines and small-sized machines, and these operations are also a major factor in reducing productivity.
Further, in the case of powder, there is a problem in handling such that the powder is clogged in the hopper when it is supplied from the hopper, the fluidity is poor, and the powder cannot be stably supplied quantitatively.

For this reason, conventionally, a master batch in which an inorganic powder is highly mixed with a resin is used. However, since the masterbatch is prepared by using the base resin according to the type of resin used, when using a large number of different resins, it is necessary to prepare a masterbatch for each resin. Therefore, even on the side that produces and sells master batches, it is necessary to prepare a wide variety of master batches. In addition, since this master batch is used by diluting it, it is used in small quantities, resulting in small-lot production of a wide variety of products, resulting in unit cost reduction. Was high.

If a masterbatch that can be commonly used for different resins is made, the stock quantity and unit cost can be reduced at the time of production, sale, and consumption, so that the development of such a masterbatch has been demanded.

[0006]

DISCLOSURE OF THE INVENTION The present invention is to solve the above problems, and an object of the present invention is to provide a masterbatch which can be used regardless of the type of resin, and at the same time, powder of inorganic powder for resin filling. It is an object of the present invention to provide a granulating composition of an inorganic powder for resin filling, which prevents standing and improves handling properties, and also leads to improvement of productivity, reduction of inventory, and reduction of unit cost. Another object is to provide a granulation composition of a resin-filling inorganic powder that imparts an antistatic function without impairing at least the function of the resin-filling inorganic powder.

[0007]

Means for Solving the Problems The inventors of the present invention have made extensive studies as to a method for preventing powdering of the inorganic powder for resin filling, and found that the inorganic powder for filling is granulated with sodium alkanesulfonate as a binder. When this granulation composition is blended with a resin, the sodium alkanesulfonate acts as an antistatic agent for the resin without impairing the function as the original reinforcing material of the inorganic powder for filling. The present invention has been found out.

The granulating composition of the resin filling powder of the present invention is
It is composed by mixing 100 parts by weight of the inorganic powder for resin filling with 10 to 50 parts by weight of sodium alkanesulfonate and granulating. Preferably, the inorganic powder for resin filling is talc, calcium carbonate, sulfuric acid. Using one or more selected from barium, mica, kaolin, titanium dioxide, silica, zeolite, sepiolite,
The average particle size of these resin-filling inorganic powders is 0.1
.About.20 microns.

The above-mentioned sodium alkanesulfonate is obtained by sulfonation of normal paraffin, and commercially available products can be used as they are, but since they become additive components to be melt-kneaded with a resin, they are softened to some extent. The higher the temperature and the higher the melting point, the more suitable it is, and it is preferable to use one having 11 to 18 carbon atoms.

The resin-filling inorganic powder used in the present invention may be any inorganic filler powder which is generally added to and mixed with the resin in order to improve the mechanical and thermal properties of the resin. Can be used without any trouble. Examples of the inorganic powder for resin filling include talc, calcium carbonate, barium sulfate, mica, titanium dioxide, silica and the like, and those generally commercially available can be used as they are.

The resin-filling inorganic powder preferably has an average particle size of 0.1 to 20 μm.
Those with a particle size of 0.1 micron or less have a low bulk density, making it difficult to knead and granulate with sodium alkanesulfonate, and those with a particle size of 20 microns or more improve the mechanical properties of the resin, whiten, and impart gloss. It tends to be difficult to obtain the effect of modifying such as.

The blending ratio of the resin-filling inorganic powder and sodium alkane sulfonate is 10 to 50 parts by weight of sodium alkane sulfonate, more preferably 100 parts by weight of the resin-filling inorganic powder. It is recommended to add 10 to 40 parts by weight. When the blending amount of sodium alkane sulfonate is 50 parts by weight or more, sodium alkane sulfonate absorbs water and softens, so that granulated particles stick to each other and form lumps, or the amount of water absorbed increases, so When kneading and blending, it is not preferable because it causes defective molding, and when the blending amount of sodium alkanesulfonate is 10 parts by weight or less, the granulation property is deteriorated, which is not preferable.

The kneading and granulation of sodium alkanesulfonate and the above-mentioned resin-filling inorganic powder are carried out by an extruder (single-screw extruder, twin-screw extruder, etc.) generally used for melt-kneading a resin and pressurization. A melt kneader such as a kneader can be used.

After preliminarily mixing sodium alkanesulfonate and the above-mentioned resin-filling inorganic powder, they are collectively charged from a hopper of a kneader or an extruder and melt-kneaded, and then a strand is extruded and air-cooled, and then granulated by a pelletizer. Or a method in which sodium alkane sulfonate is first melted with a melt kneader, inorganic powder for resin filling is added from the hopper in the middle and kneaded, then the strands are extruded and air cooled, and then granulated with a pelletizer. it can.

The granulating composition of the resin-filling inorganic powder thus obtained has a limitation that the molding and processing temperature is 350 ° C. or less due to the problem of thermal stability of sodium alkanesulfonate, but all kinds are possible. It is possible to improve the mechanical and thermal properties of the resin.

[0016]

【Example】

(Example 1) Talc having an average particle size of 10 μm [Japan Talc
Co., Ltd., MS-P] 60 parts by weight and sodium alkane sulfonate [Nippon Petrochemical Co., Ltd., SAS195] 40 parts by weight are mixed with a super mixer [Kawata Co., Ltd., SM-V-2].
0 type], followed by melt kneading with a pressure kneader (manufactured by Moriyama Seisakusho, DS1-5MHB-E), subsequently extruded by an extrusion granulator (Moriyama Seisakusho, PR-3600), and air-cooled. Then, it was pelletized to obtain granulated talc having a size of 3 to 5 mm.

About 1 kg of the obtained granulated talc was collected in a plastic bag and shaken about 10 times to observe the inside of the plastic bag, but no dusting was observed.

(Example 2) Granulation was carried out in the same manner as in Example 1 except that the same talc and sodium alkanesulfonate as used in Example 1 were used and the compounding amounts were 80 parts by weight and 20 parts by weight. Got talc.

About 1 kg of the obtained granulated talc was collected in a plastic bag and shaken about 10 times to observe the inside of the plastic bag, but no dusting was observed.

Example 3 80 parts by weight of calcium carbonate having a particle size of 1 to 5 μm (Super S manufactured by Maruo Calcium Co., Ltd.) and sodium alkanesulfonate used in Example 1 20
Granulated calcium carbonate was obtained in the same manner as in Example 1 using parts by weight.

About 1 kg of the obtained granulated calcium carbonate was collected in a plastic bag and shaken about 10 times to observe the inside of the plastic bag.
No dusting was seen.

Example 4 Using 80 parts by weight of barium sulfate (UD, manufactured by Nippon Kagaku Kogyo Co., Ltd.) having an average particle size of about 0.6 μm and 20 parts by weight of sodium alkanesulfonate used in Example 1, Granulated barium sulfate was obtained in the same manner as in Example 1.

About 1 part of the obtained granulated barium sulfate was placed in a plastic bag.
Although kg was collected and shaken about 10 times to observe the inside of the plastic bag, no dusting was observed.

Example 5 The granulated talc obtained in Example 1 was converted into polypropylene pellets (4700J manufactured by Mitsubishi Kasei Co., Ltd.).
G) and talc were pre-mixed so that the concentrations thereof were 10 and 20% by weight, and then a continuous kneader (made by KCK, 70-22
Vex type) was kneaded and extruded into pellets to obtain talc-reinforced polypropylene.

The obtained talc-reinforced pellets were processed by an injection molding machine [Yamashiro Seiki Co., Ltd., SVA-60-52 type].
The test piece was injection molded. Using a test piece obtained by injection molding, flexural modulus, deflection temperature under load (0.45 MPa),
The surface resistivity was measured. The measurement results are shown in Table 1.

(Example 6) The granulated talc obtained in Example 2 was premixed with the polypropylene pellets used in Example 5 so that the concentrations of talc were 10 and 20% by weight, and then the same as in Example 5. The talc-reinforced pellets obtained were pelletized by the method and injection-molded into test pieces. Bending elastic modulus, deflection temperature under load, and surface resistivity were measured using a test piece obtained by injection molding. The measurement results are shown in Table 1.

(Example 7) The granulated talc obtained in Example 2 was premixed with PET pellets (TR-4550BHK manufactured by Teijin Ltd.) so that the concentration of talc was 10 and 20% by weight, and then, as in Example 5. The pellets were pelletized in the same manner and the resulting talc reinforced pellets were injection molded into test pieces. Bending elastic modulus, deflection temperature under load, and surface resistivity were measured using a test piece obtained by injection molding. The measurement results are shown in Table 1.

Example 8 The granulated calcium carbonate obtained in Example 3 was premixed with the polypropylene pellets used in Example 5 so that the concentration of calcium carbonate was 10 and 20% by weight, and then Example 5 The pellets were pelletized in the same manner as above, and the resulting pellets containing calcium carbonate were injection-molded into test pieces. Bending elastic modulus, deflection temperature under load, and surface resistivity were measured using a test piece obtained by injection molding. The measurement results are shown in Table 1.

Example 9 The granulated barium sulfate obtained in Example 4 was premixed with the polypropylene pellets used in Example 5 so that the concentration of barium sulfate was 10 and 20% by weight, and then Example 5 was used. The barium sulfate-containing pellets obtained were pelletized by the same method as described above, and the obtained pellets were injection-molded. Bending elastic modulus, deflection temperature under load, and surface resistivity were measured using a test piece obtained by injection molding. Table 1 shows the measurement results
It was shown to.

Comparative Example 1 A master batch obtained by using low molecular weight PE (Sanyo Kasei Kogyo 130-P) in place of sodium alkanesulfonate in Example 2 was mixed with PP, molded and tested in the same manner. .

[0031]

[Table 1]

[0032]

EFFECTS OF THE INVENTION By pelletizing the inorganic powder for resin filling with sodium alkanesulfonate, a higher reinforcing effect than that of the conventional master batch using low molecular weight PE can be exhibited, powdering can be prevented, and handleability is improved. An excellent granulation composition was obtained. Furthermore, since these granulation compositions can be commonly used for all resins having a molding and processing temperature of 350 ° C. or less, it is possible to reduce the stock amount and the unit cost.

Claims (3)

[Claims] 1. A granulation composition of a resin-filling powder, which comprises mixing 100 parts by weight of an inorganic powder for resin-filling with 10 to 50 parts by weight of sodium alkanesulfonate and granulating. 2. The resin-filling inorganic powder according to claim 1,
A granulating composition for a resin-filling powder, which comprises using one or more selected from talc, calcium carbonate, barium sulfate, mica, kaolin, titanium dioxide, silica, zeolite, and sepiolite. 3. A granulation composition for resin-filling powder, wherein the resin-filling inorganic powder according to claim 1 has an average particle size of 0.1 to 20 μm.