JPS60149664A - Resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin compsn. which has excellent impact and weld strengths and in which a filler is uniformly dispersed in a thermoplastic resin, by blending a filler having a surface treated with a water-soluble glass or a low- melting glass with a thermoplastic resin. CONSTITUTION:A resin compsn. is obtd. by blending a filler having a surface treated with a water-soluble glass and/or a low-melting glass. As the water-soluble glass, those contg. phosphorus pentoxide, boron oxide and alkali metal oxides are usually used. As the low-melting glass, those having a softening temp. of 500 deg.C or below are usually used. Examples of such glasses are silicate, phosphate and borate glasses. Examples of the fillers are calcium carbonate, talc, woodmeal and carbon black.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin composition, and more particularly, a filler is uniformly dispersed in a thermoplastic resin, and the composition has high impact strength.

The present invention relates to a resin composition having excellent weld strength and the like.

Conventionally, resin compositions have been known in which synthetic resins are blended with inorganic fillers such as calcium carbonate, talc, and mica, or organic fillers such as wood flour and carbon black.
It is widely used for mild purposes. These fillers are usually added to improve mechanical properties, etc. However, when spherical or irregularly shaped fillers such as calcium carbonate and precipitated barium have large particle sizes, they are difficult to resist external forces in resin compositions. If the particle size is too small, it will tend to agglomerate, resulting in the same result as using a large particle size. Ta. Also, talc.

Flat materials such as mica cause a decrease in the impact strength and weld strength of the composition due to their shape, and furthermore, the shape is easily destroyed when wires are crossed, resulting in non-uniformity.

Therefore, the present inventors have conducted intensive studies to develop a resin composition that has good dispersibility and excellent mechanical properties without any restrictions on the particle size or shape of the filler particles added to the thermoplastic resin. As a result, they discovered that a resin assembly containing a surface-treated filler using a specific glass can achieve the desired effect, and completed the present invention.

That is, the present invention is a resin composition in which a thermoplastic resin is blended with a filler surface-treated with a water-soluble glass and/or a glass with a lower melting point than 4.

The thermoplastic resin used in the present invention is not particularly limited, and various types can be used. For example, polyethylene, holiflopyrene, acrylonitrile-butadiene-styrene resin (ABS resin), nylon-6 and nylon-6,6
Polyamide resin such as.

Polystyrene, polyether, polyester such as polyethylene terephthalate and polybutylene terephthalate, polycarbonate, polyvinyl chloride, polyether sulfone, polymethyl methacrylate, polyoxymethylene, polysal 7one.

Examples include poly, phenylene oxide, synthetic rubber, and the like.

The resin composition of the present invention contains a filler whose surface has been treated with water-soluble glass and/or low-melting glass. There are no particular restrictions on the water-soluble glass, but it usually contains phosphorus pentoxide (PQO), boron oxide (BQ08), and alkali metal oxide (M2O, where M represents an alkali metal). is used. In particular, each molar ratio is P*06/B208/M, 0 = 40~
55/6 to 9/30 to 60 is preferred.

Next, as a low melting point glass, the softening temperature is usually 500°C.
The following glasses are used: Such glasses include, for example, silicate glasses, phosphate glasses, borate glasses, soda lime glasses, lead glasses, barium glasses, germanate glasses.

There are aluminate glasses, vanadate glasses, arsenite glasses, tungstate glasses, molybdate glasses, sulfate glasses, norogenide glasses, chalcogenide glasses, etc., and these can be used alone or in combination. I can do it.

Further, as a filler, for example, calcium carbonate is used.

Examples include inorganic fillers such as talc, mica, precipitated barium sulfate, glass fiber, silica, glass peas, and metal powder, and organic fillers such as wood powder such as poplar, fir, maple, and oak, and carbon black. These can be used alone or in combination. The particle size of these fillers is usually 0.5 to 30μ for inorganic fillers and 325 to 30μ for organic fillers.
It is about 60 meters.

In the present invention, various methods can be applied to treat the surface of the filler with water-soluble glass and/or low-melting glass, but usually, the filler and the glass are mixed. A method in which the surface of the filler is coated with glass is preferred. For example, when using water-soluble glass, the coating method can be carried out by adding a filler to an aqueous solution of water-soluble glass, heating and mixing to evaporate water. The processing conditions at this time vary depending on the water-soluble glass, filler, etc. used, but usually the temperature is 120-170°C and the temperature is 10-20°C.
This is done by stirring for several minutes.

If low melting point glass is used, it is mixed with filler and heated to a temperature at which the low melting point glass softens.

This can be done by kneading. In addition, the above-mentioned glass accounts for 1 to 20% by weight, preferably 2 to 20% by weight based on the filler.
It may be added at a rate of 15% by weight.

When the filler whose surface has been treated with glass thus obtained is kneaded with a thermoplastic resin, it prevents the fillers from agglomerating together and enables uniform dispersion regardless of the particle size, shape, etc. of the filler. The amount of the filler surface-treated with water-soluble glass and/or low-melting glass is not particularly limited and may be determined by considering the intended use of the resin composition, but is usually 10 to 60% by weight. .

A titanate coupling agent can be added to the resin composition of the present invention if necessary. By adding the thicnate coupling agent, the adhesion between the glass component and the filler component is improved, and the surface treatment effect of the filler by the glass becomes even more remarkable.

In the present invention, each component is kneaded by a conventional method, for example, using a kneading machine such as a Banbury mixer, a single-screw extruder, or a twin-screw extruder.

For example, when using an extruder, the kneading conditions include a temperature of 1
If a Banbury mixer is used, the temperature is 190-230°C for 10-20 minutes.

Next, the resin composition thus obtained is pelletized, and the pellets are then injection molded.

Various molded products can be manufactured by molding into appropriate shapes using molding means such as extrusion molding.

Since the resin composition of the present invention uses a filler surface-treated with glass, the filler is prevented from agglomerating and is uniformly dispersed without being affected by the particle size, shape, etc. of the filler used. Therefore, by using this resin composition, a molded article with extremely excellent impact strength can be obtained. In addition, destruction during mixing of the filler is prevented, and a decrease in the mechanical strength of the molded product due to its shape, particularly in weld strength, is also prevented.

Furthermore, since the resin composition of the present invention uses the specific filling material as described above, it has low rigidity, hardness, and
In addition to improved heat resistance, it also has very good chemical resistance.
The molding shrinkage rate during molding is also small.

Therefore, the resin composition of the present invention is manufactured under the precision industry system.

Building materials, office equipment housings, acoustic components 2. It can be effectively used as a material for automobile parts, etc.

Next, the present invention will be explained in detail with reference to Examples.

Example 1 30 parts by weight of calcium carbonate was added to water-soluble glass (Pa5s
41.2 fg%, N'a20 39.3% by weight.

Kso 12.5i! -□%, Tl20117.0% by weight) 2 to a 10ii% concentration aqueous solution of 20%, and heat-mixed at 150°C for about 10 minutes using a Henschel mixer to evaporate as much water as possible. A coated calcium carbonate was obtained. 70 parts by weight of homopolypropylene (manufactured by Idemitsu Petrochemical Co., Ltd., [, r-7ooG, J) was added to the obtained water-soluble glass-coated calcium carbonate to form a gel, and the mixture was kneaded at 200°C in a single-screw extruder to form pellets. It became. Next, the chemical resistance and mechanical properties of a test piece (dimensions: 80 x 80 x 3.2 mm) obtained by injection molding the pellet were evaluated. The results are shown in Tables 1 and 2.

In addition, chemical resistance and physical properties were evaluated as follows.

Evaluation method 19 A chemical resistance test piece was immersed in a 10% hydrochloric acid aqueous solution and a 5% acetic acid aqueous solution, and after boiling at 70'C for 1 hour,
The presence or absence of elution was evaluated.

2. Mechanical properties (1) Tensile strength ASTM D-638K compliant (2) Flexural modulus ASTM D-790 compliant (3) Izod impact strength ASTM T)-256 compliant (4) Rockwell hardness ASTM D- 785 (5) Heat distortion temperature ASTM D-648 (6) Weld retention rate Comparison of presence or absence of weld by tensile strength (7) Dispersibility Press-molding a film with a thickness of 100 μm and visually observing light transmission It was judged.

Example 2 A test piece was obtained in the same manner as in Example 1, except that 0.3 parts by weight of a titanate coupling agent was added when 80% of the water in the water-soluble glass had evaporated. Table 2 shows the physical property measurement results for this test piece.

Examples 3 to 12 and 2° Comparative Examples 1 to 11 Test pieces were obtained in the same manner as in Example 1, except that the types and amounts of each component were set to the proportions shown in Table 2. . The measurement results for this test piece are shown in Tables 1 and 2.

Example 13 3 parts by weight of low-melting glass was added to 30 parts by weight of calcium carbonate, and the mixture was heated and mixed at 380° C. for about 10 minutes using a heated intermix to obtain glass filler-coated calcium carbonate. 70 parts by weight of homopolypropylene was added to the obtained glass filler-coated calcium carbonate, and the mixture was heated at 150°C using a Banbury mixer for about 20 parts by weight.
Kneaded for a minute. Next, pellets were obtained using a roll kneader and a sheet pelletizer. Hereinafter, test pieces were obtained in the same manner as in Example 1, and mechanical properties were evaluated. The results are shown in Table 2.3゜Table 1 *l: Contains O-3% by weight of a titanate coupling agent (manufactured by Ajinomoto Co., Ltd., [K-TTSJ)] as an additive.

Cell 2...PP: Homopolypropylene (Idemitsu Petrochemical (
Co., Ltd., -[J-700GJ) PE: Polyethylene (Idemitsu Petrochemical Co., Ltd., [210
,yJ) ABS:7ri! J lonitrile-butadiene-styrene resin (manufactured by Ube Zykon Co., Ltd., 1-BX-150J) *3
...QaOO+ 'Calcium carbonate (Kaneko Mining Co., Ltd.)
Talc: manufactured by Asada Seifun Co., Ltd., [5W-AJ sedimentary BaS
O4: Precipitated barium sulfate (manufactured by Barite Industries Co., Ltd.,
"5TJ) Manufactured by My Car Kuraray Co., Ltd., "200KiJ Wood Powder: Manufactured by Marui Co., Ltd., r 150MJ Glass Fiber Manufactured by Asahi Fiber Co., Ltd., [03-MA-486AJ * 4 = load 18.6kg/crrL2 It was measured.

Claims (1)

[Claims] l) A resin composition comprising a thermoplastic resin and a filler surface-treated with water-soluble glass and/or low-melting glass. 2) Water-soluble jj ras are PQO, B, O, and MQ
4 each of O (where M represents an alkali metal)
0-55 mol%, 6-9 mol% and 30-60 mol%
2. The resin composition according to claim 1, wherein the resin composition comprises: 3) The resin composition according to claim 1, wherein the low melting point glass has a softening temperature of 5'OO'C or less.