JPH0337253A - Cleaning composition - Google Patents

Abstract

PURPOSE:To prepare a cleaning compsn. useful for cleaning the inside of a thermoplastic molding machine after molding at a high temp. by compounding a thermoplastic fluororesin, a specific inorg. filler, and a lubricant each in a specified amt. CONSTITUTION:100 pts.wt. thermoplastic fluoropolymer (e.g. a vinylidene fluoride resin), 30-200 pts.wt. inorg. filler (e.g. CaCO3) having a mean particle diameter of 1-30mum, and 0.05-5 pts.wt. lubricant (e.g. OP wax, a product of Hoechst) are compounded to give a cleaning compsn.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cleaning composition, and more particularly to a cleaning composition suitable as an internal cleaning agent for a molding machine for thermoplastic resin molded at high temperatures.

[Conventional technology]

Conventionally, the molding temperature for plastics such as polystyrene, polyethylene, polypropylene, etc. that is subjected to molding processing has been at most about 250°C. However, in recent years, there has been an increasing demand for highly functional molded products made of resins such as various engineering plastics and fluororesins, which can only be molded at higher temperatures.

By the way, when molding raw materials with different grades, raw material compositions, etc. are molded, it is necessary to prepare a molding machine with different molding conditions set for each molding raw material, or to clean the molding machine after each use. After that, the molding conditions must be set and used again.

[Problem to be solved by the invention]

However, the above-mentioned highly functional molded products are usually produced in small quantities in a wide variety of products, so it is necessary to prepare a large number of molding machines with different molding conditions set according to the products being manufactured.
Furthermore, cleaning the molding machine every time it is used is disadvantageous in terms of cost and requires complicated work. In addition, after molding plastics that require high molding temperatures, it is difficult to disassemble and clean each part due to the high temperature of the molding machine, and if you clean it after cooling, the resin remaining in the molding machine will There were problems such as solidification, making it difficult to disassemble and clean the molding machine.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cleaning composition suitable for easily cleaning a flask molding machine after molding at high temperatures.

[Means to solve the problem]

The present invention solves the above problems by (A) 100 parts by weight of a fluorine-based thermoplastic resin, (B) 30 to 200 parts by weight of an inorganic filler with an average particle size of 1 to 30 μm, and (C) 0.05 to 200 parts by weight of a lubricant. 5 parts by weight of the cleaning composition.

The fluorine-based thermoplastic resin that is component (A) of the cleaning composition of the present invention is not particularly limited as long as it is a thermoplastic fluorine-based resin, and for example, vinylidene fluoride homopolymer or vinylidene fluoride may be used. It may be a copolymer of the main component and a monomer copolymerizable with the main component. Examples of monomers copolymerizable with vinylidene fluoride include tetrafluoroethylene, chlorotrifluoroethylene, vinyl fluoride, hexafluoropropylene, and the like.

These may be used alone or in combination of two or more. Among these, vinylidene fluoride homopolymers,
A copolymer containing vinylidene fluoride as a main component is preferred.

Further, recycled products such as scrub products or trimming edges produced during molding of molded products of these fluorine-based thermoplastic resins may also be used.

The inorganic filler that is component (B) of the composition of the present invention is not particularly limited as long as it is added to ordinary fluororesins, and examples include calcium carbonate, silica powder, clay, glass powder, and silicic acid. Examples include calcium. The average particle size of this inorganic filler is 1 to 30 μm, preferably 3 to 20 μm.
It is m. If the average particle size of the inorganic filler is less than 1 μm, it will be completely finely dispersed in the component resin, reducing the polishing effect on metals, and mixing with the fluorine-based thermoplastic resin (8) may even be harmful. Have difficulty. If it exceeds 30 μm, the head pressure of the extruder increases due to clogging of the screen and the player plate, and the load on the extruder increases. Further, it is not preferable because it may damage the inner surface of the extruder or die.

The content ratio of the inorganic filler (b) in the composition is (^
) 3 parts per 100 parts by weight of the fluorine-based thermoplastic resin
The amount is 0 to 200 parts by weight, preferably 40 to 100 parts by weight, and more preferably 50 to 70 parts by weight. If the content of the inorganic filler is less than 30 parts by weight based on 100 parts by weight of the fluorine-based thermoplastic resin as component (A), the polishing effect on the metal surface will not be sufficiently exerted, and the residual resin will adhere to the inside of the extruder. cannot be sufficiently removed.

Moreover, if it exceeds 200 parts by weight, kneading with the main component resin becomes difficult and granulation becomes impossible. Even if granulation is possible,
This is not preferable because the load on the extruder becomes too large during cleaning.

The lubricant that is component (C) of the composition of the present invention is not particularly limited as long as it is added as appropriate during normal thermoplastic resin molding and is heat resistant.
Examples include ester wax such as P wax; fatty acid agodo lubricant such as stearic acid bisamide; fine particles of fluororesin such as polytetrafluoroethylene. In particular, those having a melting point of 1OO"C or higher exhibit sufficient lubricity when cleaning cylinders at high temperatures, and the composition of the present invention itself can clean only the remaining molding resin without adhering to metal. preferable.

The content ratio of the lubricant (C) in the composition of the present invention is (
The amount is 0.05 to 5 parts by weight, preferably 0.2 to 1 parts by weight, and more preferably 0.2 to 0.7 parts by weight, per 100 parts by weight of the fluorine-based thermoplastic resin of component A).

Fluorine thermoplastic resin with lubricant content as component (A) 1
If the amount is less than 0.05 parts by weight, the lubricating properties will be poor and the main component may fuse with the metal surface and remain in the cylinder, and the extruder may generate heat during kneading and reach abnormally high temperatures. This may cause some inconvenience. If the amount exceeds 5 parts by weight, the lubricity is too high and the resin to be cleaned becomes lubricious, resulting in poor cleaning effects, which is not preferable.

The cleaning composition of the present invention includes the above (^), (B
) and (C), other resin components, such as acrylic resins, may be blended as necessary.

Examples of acrylic resins that can be blended include methyl methacrylate resin Acrybet VH manufactured by Mitsubishi Rayon Co., Ltd.
etc.

When blending acrylic resin, the blending amount is usually
(A) Preferably it is 100 parts by weight or less, more preferably 5 to 50 parts by weight, particularly preferably 5 to 10 parts by weight, per 100 parts by weight of the fluorine-based thermoplastic resin. If the amount of acrylic resin is too large, the fluororesin's inherent non-adhesion to metals, heat resistance, etc. will be impaired.

As a method for cleaning a molding machine after molding using the cleaning composition of the present invention, after the acid forming process is completed, the cleaning composition of the present invention can be used from the molding resin inlet of the molding machine.
a.Put something in, continue to operate the molding machine, the molding resin remaining in the molding machine will be pushed out by the movement of the cleaning composition, and the cleaning composition will come out from the outlet of the resin. This can be done by continuing the molding operation until then, then disassembling the molding machine and cleaning each part. The temperature of the molding machine during this cleaning work may be the same as the temperature during the molding process, or may be lowered by about 10°C than during the molding process, and the temperature may be maintained at that temperature.

The cleaning composition of the present invention can be applied as a cleaning agent to any molding machine such as extrusion molding or injection molding.

〔Example〕

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

Example I Using a 20 mmφ single screw extruder equipped with a T-die, the cylinder temperature was 170-210'C, the die temperature was 220
"C, vinylidene fluoride resin (manufactured by Solvay, 5OL
A film having a thickness of 50 μm was produced by extrusion molding a molding resin consisting of EP 100B).

After the production of the film is completed, add the following formulation to the extruder: Vinylidene fluoride resin (manufactured by Solvay, 5QLEF10)
10) 100 parts by weight of calcium carbonate (Shiraishi Calcium Co., Ltd., Wheaton SB)
100 g of a pellet-like cleaning composition consisting of 100 parts by weight of OP wax (manufactured by Hoechst) and 0.5 parts by weight was added to replace the molding resin remaining as a melt in the extruder, and the cylinder and After the molding resin remaining in the die is extruded and taken out from the tip of the die, cleaning m
When it was confirmed that the acid had come out, the extruder was stopped.

Next, we removed the die from the extruder body, disassembled it, and observed the adhesion of the molding resin inside the die, and found that the molding resin did not adhere to the plating surface inside the die, and the remaining cleaning composition When I peeled it off with a copper wire, I was able to remove it completely without any residue.

Furthermore, the screw of the extruder was rotated again to extrude the cleaning composition in the cylinder.

After this extrusion work was completed, we inspected the inside of the barrel and screw of the extruder, and found that there was no residue or deposits, and it was very clean, so there was no need to clean it again.Example 2 Using a 20 mmφ extruder, the cylinder Temperature 170-2
A molding resin made of vinylidene fluoride resin (manufactured by Solvay, 5OLEF 1008) was extruded at 50° C. and a die temperature of 330° C. to produce a pipe with a diameter of 20 aua.

After manufacturing the pipe, remove the die and breaker plate from the extruder, and while slowly cooling the cylinder, rotate the screw at a rotation speed of 2 Or, p, m, and mix the following formulation: 100 parts by weight of vinylidene fluoride resin recycled from defective products (manufactured by Shiraishi Calcium Co., Ltd., Whiten SB)
) 50 parts by weight ○P wax (
(Manufactured by Hoechst) 0.3 parts by weight Bisa ξF stearate (
Manufactured by Shiraki Hydrogen Co., Ltd., Alflow H)
A cleaning material consisting of 5 parts by weight of 0.3 parts by weight of acrylic resin (manufactured by Mitsubishi Rayon Co., Ltd., Acryvet VH) was added, and the cylinder temperature was lowered at a rate of lOoC in 10 minutes while remaining inside the cylinder. The molding resin was replaced with the cleaning composition during extrusion. When the cylinder temperature dropped from 150°C at the cylinder base (C3) to 190°C at the cylinder tip (C2), the screw was removed. At this time, the screw could be removed from the cylinder with just a slight push. Additionally, the removed screws could be easily cleaned by wiping the surface with a cloth. Furthermore, there was no need to clean the inner surface of the cylinder.

Comparative Example 2 After manufacturing a vinylidene fluoride resin film by extrusion molding in the same manner as in Example 1, the following formulation was used as a cleaning composition: Vinylidene fluoride resin (manufactured by Solvay, 5OLI!P1)
008) Each part of the extruder was cleaned using a composition consisting of 100 parts by weight and 50 parts by weight of calcium carbonate. As a result, although a cleaning effect was observed, the cleaning composition adhered to about half of the screw surface and could not be removed unless rubbed off with a brush. Therefore, cleaning work took time.

Comparative Example 3 Solef 1008 as vinylidene fluoride resin for molding
(manufactured by Solvay) in the same manner as in Example 1, and then the molding machine was cleaned using a commercially available cleaning agent (manufactured by Chisso, Z Clean). As a result, Z-Clean does not replace well with vinylidene fluoride resin for molding in molding machines at high temperatures;
It was not possible to completely replace the molding resin. In addition, the cleaning agent and molding resin stuck to the surface of the screw, and the entire surface of the screw had to be cleaned by scrubbing with a brush.

[Effects of the Invention] The cleaning composition of the present invention has excellent cleaning properties for a molding machine after molding processing, and is particularly effective as a cleaning agent for cleaning the inside of a molding machine after molding processing at high temperatures, which has been difficult in the past. It is suitable as

Furthermore, by using this cleaning m-acid, it is possible to effectively and easily clean a plastic molding machine.

Claims (1)

[Claims] (A) 100 parts by weight of fluorine-based thermoplastic resin (B) Inorganic filler with an average particle size of 1 to 30 μm 30-200 parts by weight as well as (C) 0.05 to 5 parts by weight of lubricant A cleaning composition comprising: