JPS5821441A - Abs resin composition - Google Patents

Abstract

PURPOSE:To prepare a composition having improved metallic appearance and giving no weld line, by compounding metallic powder to an ABS resin having a specific melt flow index. CONSTITUTION:An ABS resin having a melt flow index of >=25g/10min, especially >=40g/10min, is compounded with 0.5-50wt%, preferably1 -30wt% of metallic powder selected from aluminum, copper or their alloy, e.g. alloys of Cu-Zn, Cu-Ni, Cu-Al, etc., and having particle diameter of preferably 1-200mu.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to metal-containing ABS resin compositions with improved surface appearance.

Conventionally, methods such as metallic painting, hot stamping, wet plating, and dry plating have been proposed as methods for imparting a metallic appearance to the surface of ABS resin, but these are methods for surface treatment of resin moldings. However, a complicated process is required. There is also a method of directly adding metal powder to the resin and molding it through such a process, but this method shortens the process by producing a product with a metal-like appearance just through the molding process. Therefore, this is the preferred method.

(JP-A No. 54-97674, JP-A No. 55-4575)
(No. 3 Publication) However, the ABS resin molded products having a metal-like appearance obtained by these methods have the following drawbacks.

Firstly, the surface of a resin molded product mixed with metal powder has a poor metallic texture and is dark in color.Secondly, when the shell resin is subjected to injection molding, weld lines are noticeable on the surface of the molded product.

In the present invention, the well "line" is a phenomenon that occurs more or less when injection molding ABS resin, in which the molten resin branches and flows along the flow path of the mold, and then merges and fuses again. The cause of this is that as the temperature at the tip of the molten resin flow branched along the flow path of the mold decreases, it becomes difficult to mix the resin when the branched flows merge and fuse. For this reason, a cross section of the fused surface appears on the surface of the molded product and a weld line is thought to occur, but with ABS resin mixed with metal powder,
It is thought that the occurrence of well lines becomes noticeable because the thermal conductivity is higher than that of the base ABS resin, and the temperature of the molten resin flowing in the mold decreases quickly.

In view of the above considerations, the present inventor attempted to develop a base resin for metal powder-containing AB13 resin. The present invention was completed based on the discovery that the weld lines were significantly reduced and the metal texture was improved at the same time.

The present invention will be further explained below. The present invention provides specific AB8
The resin is mixed with 0.5 to 50 weight of powder of one or more metals selected from aluminum, aluminum, steel, or alloys thereof, and when specified 0ABS resin is used,
! Make it slight.

The metal powder used in the present invention is aluminum.

Powders of metals selected from steel or alloys thereof, each of which is a single powder, a mixed powder, or a metal powder.

The composition of the metal powder determines the hue of the metal-containing AB8 resin obtained, so the selection of the powder is determined by the hue of the desired molded product. Specific examples of these alloy powders include Cu-Zn, C! u-Ni, Cu-8n
.

Examples include Cu-AL, Cu-kW, Cu-Pb, etc., and any one may be selected from these depending on the desired hue. Aluminum powder, copper powder, or alloy powder thereof may be used alone or as a mixture.

The particle size of the metal powder determines the surface appearance of the metal-containing AB8 resin obtained, and therefore, the selection of the particle size is determined by the appearance of the desired molded product. In practice, the average particle size is 0.1-50
A thickness of about 0μ, preferably about 1 to 200μ, provides a practical appearance. The metal powder used in the present invention is preferably one whose surface is coated with a higher fatty acid, etc., considering the difficulty of work such as dust explosion and pneumoconiosis. If the substance that coats the surface is a liquid substance that does not have an undesirable effect on the resin, then it is 4! There is no limit to this, and in some cases solid powders with high covering ability may be used. Specific examples thereof include higher fatty acids, higher fatty acid esters, higher fatty acid amides, liquid paraffin, silicone oil, heptatalic acid esters, etc. It will be done.

The amount of metal powder added to AE13 resin is 0.5 to 50
The weight is preferably 1 to 60% by weight.

If the amount is less than 0.5% by weight, the effect of adding the metal powder will not be sufficient, and if it is more than 50% by weight, the impact strength of the metal-containing AB8 resin will drop significantly, making it impractical.

The AB8 resin used in the present invention is 2! It is essential to have a melt 70-index of M/10 minutes or more, preferably 35M/10 minutes, and if you want the same effect, a melt 70-index of 40 tons/10 minutes or more. preferable.

In the present invention, melt 70-index refers to JI
Measured temperature 2 by the test equipment specified in SK7210
Test conditions of 50℃JS, o o- JISx721
The measurement was performed using an operating method similar to the 0A method, and the value was recorded in units of 2/1o minute of the fat filter that flowed out in 10 minutes. Metal-containing AB8411 made with AB8 resin with a melt 70-index of less than 25 r/10 minutes
Grease is undesirable because it causes noticeable weld lines when subjected to injection molding and has a poor metallic texture.

The composition of AB8 resin is 25″t/10 minutes or more melt 7
Any method can be used as long as the melt 70-index of AB8 resin can be increased. First, reduce the IM component content, and second, reduce the acrylonitrile component content. do, 3rd
Second, copolymerization of monomers is carried out, which has the effect of lowering the molecular weight and fourth, improving fluidity. Fifth, adding a lubricant is a known method. In the first method, the impact strength of AB8 resin decreases as the im component content is reduced, and this phenomenon becomes even more significant due to the mixing of metal powder. A lower limit arises.

The im component content necessary for obtaining practical impact strength as a metal-containing AB8 resin is 5% compared to a metal-containing AB8 resin.
weight or more, more preferably 10 weight or more. Specific examples of the fourth monomer having the effect of improving fluidity include methyl acrylate, methyl methacrylate, ethyl acrylate, zotyl acrylate, hexyl acrylate, cyclohexyl acrylate,
Examples include acrylic esters such as -ethylhexyl acrylate, rx methyl methacrylate monomers, and vinyl ether monomers such as methyl vinyl ether, ethyl vinyl ether, hexyl vinyl ether, and phenyl vinyl ether. Fifth, the addition of a lubricant is often effective, and the amount added is 0.1 to 10% of the base AB8 resin.
The weight ratio is preferably 0.3 to 5% by weight. If it is less than 0.1 weight, the effect of adding the lubricant will not be sufficient, and if it is less than 10 weight,
If it exceeds this value, the various strengths of the resin will decrease. Specific examples of the types of lubricants added to λB8 resin include stearic acid,
Higher fatty acids such as oleic acid, partinic acid, and linoleic acid, and their Ca, MP, Zn, Ba, and AA
, metal salts such as Pb, stearyl alcohol, oleic alcohol, lauryl alcohol, tisyl alcohol,
Higher alcohols such as octyl alcohol and cetyl alcohol, stearinamide, pallic acid amide, methylene bisstearoamide p, and ethylene C stearamide 7 mip%
higher fatty acid molecules, ethyl stearate, tetyl stearate, octyl stearate, ethylene glycol monostearate, ethylene glycol distearate, glyceryl stearate, sorbitan stearate,
Examples include higher fatty acid esters such as true tall stearate, hydrocarbon compounds such as liquid paraffin, Mike tetra wax, /liethylene wax, natural paraffin, silicone oil, etc., and these may be used alone, or
May be used together.

There are no restrictions on ABS resin due to the manufacturing method of ABS resin,
It may be obtained by any of the conventionally known emulsion polymerization methods, suspension polymerization methods, and bulk polymerization methods, or it may be obtained by a combination of these polymerization methods. For example, a resin obtained by copolymerizing monomers such as acrylonitrile and styrene in the presence of a DEM component is mixed with a resin having a composition different from the above-mentioned resin, which is separately polymerized and contains a male component, or does not contain a male component. According to this, an ABS resin having an excellent balance between impact strength and fluidity can be obtained. Specifically, a mixture of ABS resin with a high male content and low fluidity and A8 resin with high fluidity,
For example, a mixture of an ABS resin with a high mu content and low fluidity, an ABS resin with a low black mu content, and an A8 resin with high fluidity can be mentioned.

The method of mixing the ABS resin and metal powder is not particularly limited, and conventionally known techniques and devices can be used. That is, AB
A method of kneading S resin powder or pellets with metal powder in a molten state, or a method of adding metal powder during any step of the AB8 resin polymerization process can be adopted.

As the melt mixing device, a Banbury mixer, an intensive mixer, a mixtruder, a coneater, an extruder, a roll, etc. are used.

Metal-containing AB where metal powder is uniformly dispersed in ABS resin
It is not always necessary to prepare S resin and resubmit it to a molding device, and it is also possible to mix metal powder and ABS resin with a Henschel mixer or the like and directly mold the mixture.

Additives to the metal-containing ABS resin, such as pigments,
It may be necessary to add dyes, stabilizers, dispersants, reinforcing materials, fillers, weathering agents, antistatic agents, heat retardants, foaming agents, etc. depending on the application, and molding can be done by paper cutting or known molding methods. .

As mentioned above, products molded using the resin composition of the present invention have an improved surface appearance, an excellent metal texture, a bright hue, and, especially in the case of injection molded products, there are wells on the surface. This has the excellent effect that the 2nd line is almost invisible.

The reason for this is that the flow time of the molten resin in the mold becomes shorter, and even for resins with high thermal conductivity, the branched resin flows are combined and fused before a fatal resin temperature drop occurs. Therefore, the number of well lines is reduced by two. In addition, for the same reason, the temperature gradient of the molten resin flow in the cross-sectional direction of the mold becomes smaller, and the metal powder composition in the cross-sectional direction of the mold becomes relatively uniform. It is thought that the metallic texture is enhanced because the metal content in the vicinity is high.

As explained above, metal-containing ABS resin has a rich metallic texture and has inconspicuous weld lines, so it has a wide range of uses as a substitute for metals or metallized resins, and is extremely useful for ornaments and the like.

Hereinafter, the present invention will be explained in detail with reference to Examples. However, all parts and weights described in the examples are expressed on a weight basis.

Example 1 19.7 L of acryloniatrile, 100 parts of a resin made by adding 2% of ethylene bisstearamide F to 98 L of ABS resin consisting of 18.0 L of butadiene and 62.31 L of styrene,
Aluminum powder (average particle size 1 μm) and brass powder (average particle size 15 tones) were added in the amounts shown in Table 1 and mixed in a Henschelmi Φcer, followed by melt kneading in an extruder to obtain pellets. Table 1 summarizes the appearance of molded products of this resin. The base resin made of ABS resin and ethylene♂stearoambar used in this example has an Izot impact strength of 1.
8Kr 閤/Tan, l Lutoflow Indices 53r/10
It's worth it.

Example 2 3 parts of aluminum powder (average particle size: 10 μm) was added to 100 parts of a base ABS resin having the impact strength and melt 70 index shown in Table 2 to obtain pellets. Table 2 shows the evaluation results of this resin.

Example 3 The same procedure as in Example 1 was carried out except that the brass in the alloy powder was replaced with bronze. The results were the same as in Example 1. Comparative Example ABS resin 100 having the impact strength and melt 70-index shown in Table 6 3 parts of aluminum powder (average particle size: 10 μm) was added to each part to obtain pellets. The evaluation results of this resin are summarized in Table 3. However, in the resin of Experiment No. 019, 4 parts of stearyl alcohol was added to the resin of Experiment No. 018.

The physical properties shown in the Examples and Comparative Examples of the present invention were determined by the following method.

1. Izotsu impact strength..., TZS K
6871゜2, Melt 70-Index...
・・JIS K 7210゜However, warm guest 250'0, load 5.00 Kf.

A molded product was made using a 5-ounce injection molding machine using a mold equipped with a 30-inch mark. Molding temperature 240
'C! , the mold temperature is 50' (L, and the injection pressure is the lowest injection pressure F) 5 to '4/at? I set it high. The metallic texture (lightness and darkness of glossy color, etc.) of the obtained molded product and the degree of weld line were evaluated using a 5-step N/indication scale.

A: Very good, B: Good, C: Average, D; Poor, F;
Extremely bad. If the metal texture and weld line are below D, the product value is poor, and F is extremely poor.

Procedural amendment December 12, 1981 Commissioner of the Patent Office Shima 1) Haruki Tono1, Indication of the case 1982 Patent Application No. 1186102, Name of the invention ABS resin composition 6, Person making the amendment Related Patent Applicant Address 1-4-1 Yurakucho, Chiyoda-ku, Tokyo Column 5 of Detailed Description of the Invention in the Specification, Contents of Amendment 1) Change ``to use'' to ``to use'' on page 6, line 14 of the specification. "I am corrected."

3) On page 6, line 9, "Do." is corrected to "Do."

4) Page 8, line 18 “and 1 or” wo “and/or”
I am corrected.

Claims (1)

[Claims] An ABS resin composition comprising an ABS resin having a melt flow index of 25 f/10 minutes or more and containing 5 to 50% by weight of one or more selected from aluminum, steel, or an alloy thereof.