JP3049252B2 - Resin material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin material particularly suitable for a vehicle component requiring metal plating.

[0002]

2. Description of the Related Art Conventional vehicle parts, for example, an outer handle and an inner handle of an automobile door, are made of any one of polyacetal resin, nylon resin, polycarbonate resin and the like as a resin material satisfying the required strength and rigidity. A composite material containing a filler such as talc, mica, and wollastenite is used, and their surfaces are plated with glossy chrome.

[0003] However, since each of the above resins is a very hard material, it is necessary to treat the surface of the resin with a special strong acid etching solution before plating the surface. We have only the most common type of plating equipment for ABS resin. When changing the etchant, a plating line must be newly established separately from that for ABS resin, which means that various parts are required. Changing the plating conditions for some parts makes it difficult to maintain good quality control of each product. .

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a resin material which can be used for plating equipment for ABS resin and has the strength required for parts for vehicles and the like.

[0005]

Therefore, the resin material according to the present invention has a butadiene content of 40 to 60% by weight.
ABS resin having an average molecular weight of 20,000 to 25,000
Shrinkage during molding with polycarbonate resin
Alloy material for plating , wherein the ABS resin is 30
-40% by weight, and the polycarbonate resin is 70-60%
Wt%, butadiene content accounts for 15-20 wt%.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the configuration of the present invention will be described in detail. When applying metal plating such as chrome plating to the surface of a resin material, as is known, after etching the material surface with an acid solution to form many fine concave portions,
After conducting a water washing treatment or an activation treatment, the surface is made conductive by chemical plating, and the metal is electroplated. In the case of an ABS resin material, butadiene particles contained therein are eluted from the material surface by an acid solution. In the later minute recess,
The metal to be plated is deposited in advance, and it acts as an anchor for the plating layer deposited in the form of a film thereon, thereby preventing the plating layer from falling off, so that it is contained in the resin material. Butadiene content is important. However, since the butadiene content of the high-butadiene-containing ABS resin is limited to 40 to 60% by weight due to production technology, the ABS resin containing the resin material according to the present invention has a butadiene content of 40 to 60% by weight.

On the other hand, in FIG. 1, when the weight ratio R of the ABS resin to be blended with the polycarbonate resin is changed, the quality of the plating property when chrome plating is performed on a normal ABS resin plating line, ie, A curve A represents a case where a high-quality plating layer is formed, Y represents a case where a non-plated portion occurs when a thick material is used, and X represents a case where a non-plated portion occurs. As shown in the figure, when the weight ratio R of the ABS resin is less than 30%, the plating property rapidly deteriorates, and when the weight ratio R is 30% or more, the plating property is kept good. Is preferably 30% by weight or more.

As shown by the impact strength curve B in FIG. 1, the impact strength of the resin material decreases as the weight ratio of the ABS resin in the alloy material increases, and A
When the weight ratio of the BS resin exceeds 40%, the impact strength is greatly reduced, and it is difficult to adopt the resin component for a resin part requiring impact strength such as a door handle for a vehicle. For this reason, the ABS resin content of the resin material according to the present invention is 30 to 40% by weight, the polycarbonate resin content is 60 to 70% by weight, and the butadiene content in the alloy material is a normal AB.
15 to 20 corresponding to the butadiene content in the S resin
% By weight.

On the other hand, the polycarbonate resin has a rupture stress that varies according to its average molecular weight, and generally has poor flowability at the time of molding. Must be suppressed. The breaking stress of an alloy material containing 60% by weight of the contained polycarbonate resin and 40% by weight of the containing ABS resin was measured by changing the average molecular weight of the polycarbonate resin. As shown in a curve C of FIG. If the average molecular weight is less than about 20,000, the breaking stress sharply decreases and the material is easily broken. Therefore, as an alloy material for use in vehicle parts and the like, the average molecular weight of the contained polycarbonate resin needs to be 20,000 or more. .

Further, the door handle 1 for a vehicle shown in FIG. 3 was formed from the above alloy material, and the amount S of sink marks 3 generated on the surface 2 of the thick portion was measured by changing the average molecular weight of the polycarbonate resin. The sink amount S changes as shown by a curve D, and is always small as compared with a curve E indicating the sink amount of a polycarbonate resin door handle having the same shape. However, when the average molecular weight of the polycarbonate resin is 25,000 or more, the sink amount S is reduced. To increase. For this reason, the average molecular weight of the polycarbonate resin is 25,000 or less, preferably 23
The resin material according to the present invention has an average molecular weight of 2,000 to 25,000 of the contained polycarbonate resin since the sink amount S is small at 000 or less and the molding of high quality resin parts becomes easy.
And

[0011]

Accordingly, the resin material according to the present invention has the strength required for parts for vehicles and the like, and can be molded with little sink mark without requiring special equipment. High quality metal plating can be easily applied by using the existing ABS resin plating equipment to enhance the commercial value as vehicle parts, etc., so that uniform quality and excellent resin parts can be produced at low cost. Can be of great practical benefit.

[Brief description of the drawings]

FIG. 1 is a characteristic diagram of a resin material according to the present invention.

FIG. 2 is another characteristic diagram of the resin material according to the present invention.

FIG. 3 is a perspective view of a part made of a resin material according to the present invention.

FIG. 4 is an enlarged sectional view taken along the line IV-IV in FIG. 3;

[Explanation of symbols]

 A Plating characteristic curve B Impact strength curve C Break stress curve D Sink amount curve S Sink amount 1 Vehicle door handle 3 Sink

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Zenya Ota 5-33-8 Shiba, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation (56) References JP-A-2-214769 (JP, A) JP-A-49-99153 (JP, A) JP-A-61-123660 (JP, A) JP-A-1-271457 (JP, A) JP-A-54-143461 (JP, A) JP-A-63-189455 (JP, A) JP, A) JP-A-5-255582 (JP, A) JP-B-2-14940 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08L 69/00 C08L 55/02

Claims (2)

(57) [Claims] 1. The content of butadiene is 40 to 60% by weight.
ABS resin having an average molecular weight of 20,000 to 25,000
Shrinkage during molding with polycarbonate resin
Alloy material for plating , wherein the ABS resin is 30
-40% by weight, and the polycarbonate resin is 70-60%
A resin material having a butadiene content of 15 to 20% by weight. 2. The resin material according to claim 1, which is used for molding into a vehicle part.