JPS59124999A - Detergent composition for molding machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to cleaning compositions for various molding machines, and more specifically, for extrusion molding machines used for molding various synthetic resins;
The purpose of the present invention is to provide a cleaning composition useful for shaking injection molding machines and the like.

Conventionally, Tanidane Plastics is colored at the same time as molding using various molding machines such as extrusion molding machines and injection molding machines, but when various colors are applied using the same molding machine, it is necessary to apply Km color every time the color is changed. It is necessary to shake the molding machine. The method described in Japanese Patent Publication No. 53-7185 and the method of pouring a large amount of uncolored resin into the molding machine when changing colors are used as methods for tightening these roots. Resin is wasted, and the operating rate of the molding machine is also low, which is unfavorable from an economic standpoint. Therefore, there is a need for a method that can clean a molding machine in a short time while using a small amount of resin.

As a result of intensive research to satisfy the above-mentioned industry demands, the present inventors discovered that a composition with excellent cleaning power could be obtained by blending various ingredients, and completed the present invention. .

That is, the present invention consists of a thermoplastic resin, an inorganic filler, and a lubricant, and the inorganic filler has an amount of about 30 to 7 ON,
A cleaning composition for a molding machine, characterized in that the lubricant accounts for about 3 to 60% by weight.

To explain the present invention in detail, the thermoplastic resin used in the present invention includes low density polyethylene, polyethylene such as high'&2 anti-polyethylene, polypropylene, polystyrene, AS resin, A-BS resin, polycarbonate resin, polyamide resin, These thermoplastic resins, such as polyester resins, are preferably used in an amount accounting for about 30 to 60% by weight of the cleaning composition of the present invention. Inorganic fillers used in the present invention include calcium carbonate, barium oxide, magnesium carbonate, talc,
It includes what are conventionally called extender pigments and fillers, such as silica and alumina. Preferably, these fillers are used in a proportion of about 30 to 70 parts by weight of the cleaning composition. The lubricants used in the present invention include liquid paraffin, natural paraffin, microwax, synthetic paraffin, polyethylene wax, higher fatty acids, oxyfatty acids, intermediate fatty acid amides, alkylene bishigher fatty acid amides, higher fatty acid lower alcohol esters, and higher fatty acid polyesters. glycol esters, higher fatty alcohols,
These lubricants include higher polyhydric alcohols, polyglycols, polyglycerols, higher fatty acid metal soaps, and various waxes, and these lubricants are preferably used in a proportion of about 0.5 to 25% by weight in the detergent composition. . In the present invention, these lubricants can be used alone or in a mixture, but when used in a mixture, a lubricant that provides internal lubricity and a lubricant that provides external lubricity (C28 to C32 higher fatty acids) are used. The most excellent effect can be obtained when the former and the latter are used in combination with 1 to 10, preferably 1 to 10, preferably 5 to 5 by weight.

The essential components of the composition of the present invention are as described above, but various other additives, such as plasticizers, stabilizers, ultraviolet absorbers, antistatic agents, etc., can be optionally added as necessary. can do.

The cleaning composition of the present invention may be manufactured by simply mixing the above-mentioned essential components and optional components, but generally, after mixing each component, the composition is melt-kneaded using an extruder or the like, and then pelletized. It is preferable to use it by forming it into a shape.

When the cleaning composition of the present invention as described above is used as a shaking agent when producing colored molded articles using an extrusion molding machine or an injection molding machine, it exhibits very excellent shaking properties.

For example, when molding different colored moldings using the same molding machine, conventionally a large amount of uncolored resin is used each time the color is changed.
In addition, root tightening took a long time, but when the shaking agent of the present invention was used, the amount of resin was about 9 to 100 g. And, in terms of time, it's a pilgrimage. An equivalent shaking effect can be achieved with

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

Note that the text in the middle of the sentence or ``chi'' is based on weight.

Examples 1 to 6 The components shown in Table 1 below were blended in a mixer, then melt-kneaded in a vented 40-hour extruder and formed into a pellet shape to obtain a cleaning composition of the present invention.

Table 1 Usage Example 1 (Example of shaking an injection molding machine) After injection molding colored resin pellets containing 1% phthalocyanine blue in a 5 oz injection molding machine, Examples 1 to 6 were used.
injection molding using the cleaning composition obtained in
The amount at which the molded product would no longer be colored was determined. Furthermore, under the same conditions, the amount of resin required for root compaction using the same uncolored resin as the colored resin was determined.

Usage Example 2 (Extrusion Molding Machine Shaking Example) After extruding a resin blended with 5% phthalocyanine blue using a 31cm extruder, the hopper was tightened, and Examples 1 to 6 were
Extrusion processing and shaking were performed using the cleaning composition obtained in . Then, the amount of resin required until the extruded product was no longer colored was determined. The amount of resin required for root compaction using the same uncolored resin as the colored resin was determined under the same conditions.

As mentioned above, the cleaning agent of the present invention is extremely useful for tightening the roots when changing the color of various molding machines.

Furthermore, the cleaning agent of the present invention is useful not only for changing colors, but also for general root tightening. For example, regardless of whether the molding machine is colored or uncolored, if you stop using the molding machine, the molding machine will not cool down rapidly, so the resin remaining in the molding machine will burn or carbonize due to the residual heat of the molding machine. However, by using the cleaning agent of the present invention when restarting the molding machine, these foreign materials can be easily removed. It was possible to remove the problem, and the above problems were also solved.

Patent applicant: Dainichiseika Industrial Co., Ltd.

Claims (5)

[Claims] (1) Heat I'I] Cleaning of a molding machine comprising a plastic resin, an inorganic filler, and a lubricant, the inorganic filler accounting for about 30 to 70 parts by weight, and the lubricant accounting for about 1 to 30 parts by weight. agent composition. (2) The cleaning composition according to claim (1), which is melt-kneaded and formed into pellets. (3) The cleaning composition according to claim (1), wherein the lubricant comprises an internal lubricant and an external lubricant. (4) The cleaning composition according to claim (3), wherein the ratio of the internal lubricant to the external lubricant is 1:0.1 to 10. (5) The cleaning composition according to item (3) of Patent No. 81ζ, wherein the internal lubricant is a higher fatty acid hisamide and the external lubricant is liquid paraffin.