JPH01168737A - Coloration of synthetic resin article containing reclaimed rubber - Google Patents

Abstract

PURPOSE:To obtain a reclaimed rubber-containing synthetic resin article colored with a substantially desired color, by adding a pigment of a color other than black to the mixture in the course of kneading a thermoplastic synthetic resin material with a reclaimed rubber by heating and kneading the mixture. CONSTITUTION:A suitable amount (e.g., 1%) of a pigment of a desired color is added to a mixture formed by adding a small amount (e.g., 0.1%) of an adhesive or a dispersant to a thermoplastic synthetic resin material (e.g., particulate material of PP) and mixed to adhere the pigment to the surface of the thermoplastic synthetic resin. A predetermined amount (e.g., 25%) of a reclaimed rubber powder (e.g., one reclaimed from waste tires) is added to the mixture and the resulting mixture is melt-kneaded with a screw injection molding machine to obtain the title article molded into any desired shape.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for coloring a synthetic resin product containing recycled rubber using recycled rubber recycled from waste tires and the like as a mixed material.

(Prior Art) Thermoplastic synthetic resin products such as polypropylene and polyethylene are difficult to nail into the membrane. This method has the disadvantage that a separate connecting plate and bolts and nuts must be used, and therefore, a lot of time and labor are required for the connecting work.

Therefore, one possible way to overcome the above-mentioned drawbacks is to add rubber to the synthetic resin to impart elasticity to the product material.

That is, by heating and kneading a thermoplastic synthetic resin raw material with rubber added at a ratio of about 5% to 40%, a synthetic resin product with the required elasticity can be obtained. By forming a tapered hole in advance in the section and driving in a slat-like connecting fitting with a leg slightly larger in diameter than the tapered hole, you can easily and quickly connect the drainboards together with the same feeling as driving nails. It becomes like this.

(Problems to be Solved by the Invention) However, since rubber is more expensive than synthetic resins, there is a problem in that the addition of rubber increases the product cost.

However, if recycled rubber recycled from waste tires etc. is used as a rubber raw material, the unit price is low, so the product cost will not increase. , 20% to 40% carbon black added to impart light resistance, heat resistance, etc.
Due to the fact that the carbon black is contained in such a large proportion, when heated and kneaded with the synthetic resin, this carbon black is eluted and the entire product turns black, which limits the types and uses of products for which recycled rubber can be used. There was a problem that the range was limited.

(Means for Solving the Problems) The present invention has been made for the purpose of solving the above-mentioned problems, and in order to achieve this purpose, the present invention uses thermoplastic synthetic resin raw materials and recycled rubber. In the process of heating and kneading the raw materials, a method was adopted in which a pigment of a color other than black was added and kneaded.

(Function) In the method for coloring synthetic resin products containing recycled rubber of the present invention, as described above, in the process of heating and kneading the thermoplastic synthetic resin raw material and the recycled rubber raw material, a pigment of a color other than black is added and kneaded. By doing this, it becomes possible to obtain synthetic resin products containing recycled rubber that are colored in a color close to the desired color.Therefore, the restrictions on the types and uses of products that can use recycled rubber are eliminated, and it is used in all fields. Cheap recycled rubber will become widely available for synthetic resin products.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings. In this embodiment, a case where a drainboard is manufactured will be taken as an example.

First, a polypropylene granule raw material is used as a thermoplastic synthetic resin raw material, and 0.1 part of an additive (or dispersant) is added to 100 parts of this polypropylene granule raw material. By adding 1.0 part of the pigment and simply mixing it, the pigment is attached to the surface of the polypropylene granular raw material.

Next, recycled rubber powder recycled from discarded tires (preferably frozen and pulverized powder as fine as possible) is simply mixed at a ratio of 25%.

When the raw materials mixed in the above manner are applied to a screw-type injection molding machine, the raw materials are heated and melted within the heating cylinder, and are sent toward the mold while being kneaded by the rotation of the screw, until reaching the screw head. At the time of delivery, the polypropylene granular raw material, pigment, and recycled rubber powder are completely melted and kneaded, and the whole mixed raw material is colored green and injected into the mold, and the green colored drainboard A is made. It will be molded.

Incidentally, as shown in FIGS. 1 and 2, the drainboard A of this embodiment has a plurality of plate-like bodies 2 placed on the top surface of a plurality of pedestals L arranged at required intervals. The plate-shaped body 2 corresponding to both ends of each leg base 1, which is the longitudinal side edges of the drainboard A, has a hook-like connecting fitting 3. Grooves 20 capable of accommodating the horizontal portions 30 of the six grooves 20 are respectively constructed along the longitudinal direction of the leg base l, and the inner ends of the six grooves 20 are provided with a diameter larger than the diameter of both driving legs 31 of the connecting fitting 3. Slightly small diameter tapered hole 21
is vertically opened toward one direction of the footrest.

Since the drainboard A of this embodiment has the above-mentioned configuration, when the drainboards A and A are connected to each other on the floor of a wide balcony, both the driven legs 31 and 31 of the slat-shaped connecting fitting 3 By driving the connecting fittings 3 into the respective tapered holes 21.21 of the adjacent drainboards A and A, the elasticity of the material constituting each tapered hole 21.21 allows the connecting fitting 3 to be driven in with the same feeling as driving a nail. It will be done easily and quickly. When the connecting fitting 3 is driven in, the horizontal portion 30 of the connecting fitting 3 is accommodated in the grooves 20 and 20 of both the drainboards A, and the connecting fitting 3 does not protrude from the upper surface of the drainboard A at all.

As explained above, according to the method of coloring synthetic resin products containing recycled rubber according to the present example, the raw material of polypropylene particles, which are raw materials for thermoplastic synthetic resin, and the recycled rubber powder recycled from waste tires are added to By heating and kneading with the pigment added, a green colored drainboard A can be obtained.

In addition, in the example, the adhesion of the pigment to the polypropylene granule material was improved by adding and mixing the impregnating agent (or dispersant) to the polypropylene granule material and then simply heating the pigment. You will be able to do this.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific method and the specific configuration of the members and devices used in this method are not limited to these embodiments. Even if there are changes in the specific method without departing from the scope, they are included in the present invention.

For example, although the examples show cases in which additives (or dispersants) are added, this addition is optional, and addition of other additives is also optional.

Furthermore, the mixing ratio and mixing order of each material are arbitrary, and can be determined depending on the type of product and its use.

(Effects of the Invention) As explained above, in the method for coloring a synthetic resin product containing recycled rubber according to the present invention, in the process of heating and kneading the thermoplastic synthetic resin raw material and the recycled rubber raw material, coloring other than black color is possible. By adding and kneading pigments of the same color, it is now possible to obtain a synthetic resin product containing recycled rubber that is colored in a color close to the desired color, thus limiting the types of products and applications for which recycled rubber can be used. This has the effect that inexpensive recycled rubber can now be widely used in synthetic resin products in all fields.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a drainboard according to an embodiment, and FIG. 2 is an enlarged sectional view taken along the line 1-1 in FIG. Patent application: Kazuo Hitoakiyama (1 other person)

Claims (1)

[Claims] 1) A method for coloring a synthetic resin product containing recycled rubber, which comprises adding and kneading a pigment of a color other than black in the process of heating and kneading a thermoplastic synthetic resin raw material and a recycled rubber raw material.