Cleaning agent composition for resin molding machinery

Abstract

A resin molding machine cleaning agent composition according to the present invention is characterized by including glass fibers and a thermoplastic resin that is not an ultrahigh-molecular-weight polyethylene. The resin molding machine cleaning agent composition is also characterized by having a water content of 1,000–3,0000 mass ppm and a melt viscosity of 1,000–10,000 Pa⋅s at 280°C and a shear rate of 70 / s.

Description

[Technical Field]

[0001] The present invention relates to a cleaning agent composition for resin molding machinery. [Background technology]

[0002] Generally, resin molding machines such as extrusion molders and injection molders are used for operations such as coloring, mixing, and molding resins. However, in these types of machines, at the end of a predetermined operation, additives such as dyes and pigments contained in the resin itself and the molding material, as well as degraded products (thermal decomposition products, burnt residue, carbonized material, etc.) generated from the resin, may remain in the molding machine. If these residues are left unattended, they may be mixed into the molded product during subsequent resin molding processes, potentially causing defects in the product's appearance. In particular, when molding transparent resins, even minute amounts of carbonized material are easily visible, resulting in defects in the appearance of the molded product and increasing the rate of molded product defects. Therefore, it is desirable to completely remove these residues from inside the molding machine.

[0003] Conventionally, methods have been employed to remove residue from molding machines, including (1) manually disassembling and cleaning the molding machine, (2) filling the molding machine with the molding material to be used for the next molding without stopping the molding machine, thereby gradually discharging the residue, and (3) using cleaning agents.

[0004] Method (1) above is inefficient because it requires stopping the molding machine, and it has the problem of easily damaging the molding machine because the removal work is done physically by hand. Method (2) above often requires a large amount of molding material to remove the residue, takes a long time to complete, and generates a large amount of waste. For this reason, in recent years, the method using the cleaning agent described in (3) above has become preferred because it has superior cleaning power in removing residue from inside the molding machine.

[0005] In recent years, various resin compositions have been developed for resin molding, depending on the type and application of the molded product, and a wide variety of raw resins are used. Naturally, different types of raw resins have different melting points, and the optimal cylinder temperature, mold temperature, and solidification temperature for molding processes such as injection molding also differ. Furthermore, there are differences in the burn components produced when these various raw resins are molded. Moreover, in recent years, with the demand for higher performance molded products, resins with high molding temperatures, such as engineering plastics, are being selected as raw materials. Generally, it is known that the viscosity of a resin decreases and its fluidity increases as the processing temperature rises. Similarly, with cleaning agents, the increased fluidity at high temperatures reduces the physical force with which they can push the objects being cleaned, resulting in lower cleaning performance. For this reason, it is common to deliberately lower the cleaning temperature to a lower temperature than the processing temperature, but this is not only time-consuming but also uneconomical. In this context, there is a need for a cleaning agent composition that can effectively and easily remove burnt components derived from the raw resin, regardless of the type of resin used as the molding material. In particular, there is a need to effectively and easily remove burnt components derived from the raw resin without changing the high processing temperature during cleaning.

[0006] Patent Document 1 describes a cleaning resin composition for high-temperature cleaning that includes an inorganic filler and an anionic surfactant, with a melt viscosity within a specific range. It states that foaming, smoke, and ignition caused by the cleaning agent do not occur, and that workability is improved. Patent Document 2 describes a cleaning agent composition containing two or more polyethylene resins with a large difference in melting points. Although both cleaning agents have high melt viscosity at high temperatures, there is room for further improvement in terms of burn removal performance. Patent documents 3 and 4 describe a cleaning agent containing a masterbatch kneaded with sodium bicarbonate as an inorganic blowing agent. However, this method is not simple due to the complexity of the manufacturing process, which involves separately preparing the inorganic blowing agent masterbatch and mixing it with a thermoplastic resin. Furthermore, when preparing the inorganic blowing agent masterbatch, it is not easy to knead it with resins other than those with a low melting point and relatively low viscosity, due to the decomposability of the sodium bicarbonate used as an inorganic blowing agent. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2006-335913 [Patent Document 2] Japanese Patent Publication No. 2020-111726 [Patent Document 3] Japanese Patent Publication No. 2021-36036 [Patent Document 4] Patent No. 4504699 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] This invention was proposed in view of the above circumstances, and aims to provide a cleaning agent composition for resin molding machinery that can effectively and easily clean and remove burnt components derived from the molding raw material resin even at high cleaning temperatures. [Means for solving the problem]

[0009] As a result of various studies conducted to solve the above-mentioned problems, the present inventors have found that by creating a cleaning agent composition for resin molding machines that contains glass fiber and a specific amount of water, and whose melt viscosity at 280°C and a shear rate of 70 / s is within a specific range, burnt components originating from the molding raw material resin can be effectively and easily cleaned and removed even at high cleaning temperatures, thus completing the present invention.

[0010] That is, the present invention is as follows. (1) Glass fiber , ultra-high molecular weight polyethylene, and the above Containing a thermoplastic resin other than ultra-high molecular weight polyethylene Fat and having a water content of 1000 mass ppm or more and 30000 mass ppm or less, and having a melt viscosity of 1000 Pa·s or more and 10000 Pa·s or less at 280°C and a shear rate of 70 / s the law of nature, In the morphological image of the aforementioned cleaning agent composition for resin molding machines, a phase structure is formed in which the dispersed phase containing the ultra-high molecular weight polyethylene is dispersed in the matrix phase containing the thermoplastic resin. A cleaning agent composition for resin molding processing machines, characterized by the above. (2) The cleaning agent composition for resin molding processing machines according to (1), containing more than 5.0 mass% and 50.0 mass% or less of ultra-high molecular weight polyethylene. (3 ) before The area ratio of the dispersed phase containing the above ultra-high molecular weight polyethylene is 5% or more and 60% or less, (1) or (2) The cleaning agent composition for resin molding processing machines according to the above. ( 4 ) The content of the glass fiber is more than 5.0 mass% and less than 56.0 mass%, the cleaning agent composition for resin molding processing machines according to any one of (1) to ( 3 ). ( 5 ) The MFR at 220°C and a load of 10 kg is 0.01 g / 10 min or more and less than 3.0 g / 10 min, the cleaning agent composition for resin molding processing machines according to any one of (1) to ( 4 ). ( 6 ) The thermoplastic resin contains one or more polyolefin resins, and the MFR of the one or more polyolefin resins at 220°C and a load of 10 kg is 0.01 g / 10 min or more and 30.0 g / 10 min or less, the cleaning agent composition for resin molding processing machines according to any one of (1) to ( 5 ). ( 7 ) The weight-average molecular weight of the aforementioned ultra-high molecular weight polyethylene is between 500,000 and 9,500,000, (1)~( 6 A cleaning agent composition for resin molding machines as described in any of the following. [Effects of the Invention]

[0011] According to the present invention's cleaning agent composition for resin molding machines, burnt components derived from the molding raw material resin can be effectively and easily cleaned and removed even at high cleaning temperatures. [Modes for carrying out the invention]

[0012] The following describes in detail an embodiment for carrying out the present invention (hereinafter referred to as "this embodiment"). However, the present invention is not limited to the embodiment described below, and can be implemented in various modifications within the scope of its gist.

[0013] <Cleaning agent composition for resin molding machinery> The cleaning agent composition for resin molding machinery of this embodiment (hereinafter also simply referred to as "cleaning agent composition") comprises glass fiber and a thermoplastic resin other than ultra-high molecular weight polyethylene, has a water content of 1,000 ppm by mass or more and 30,000 ppm by mass or less, and a melt viscosity of 1,000 Pa·s or more and 10,000 Pa·s or less at 280°C and a shear rate of 70 / s. The components of the detergent composition of this embodiment will be described in detail below.

[0014] (thermoplastic resin) The thermoplastic resin other than ultra-high molecular weight polyethylene (hereinafter also simply referred to as "thermoplastic resin") contained in the detergent composition of this embodiment is not particularly limited, and a wide range of thermoplastic resins commonly used in injection molding, extrusion molding, etc., can be used, either individually or in combination of two or more. The thermoplastic resins that are preferred include, for example, polyolefin resins, ethylene-vinyl acetate copolymer resins, ethylene-aliphatic unsaturated carboxylic acid copolymer resins such as ethylene-acrylic acid copolymers, ethylene-aliphatic carboxylic acid ester copolymer resins such as ethylene-acrylic acid ester copolymers, styrene resins such as polystyrene, polycarbonate resins, polyamide resins, polyester resins, polyvinyl chloride resins, and polyolefin resins, with polyolefin resins being more preferred. Furthermore, if the thermoplastic resin is of the resin type described above, it may be a materially recycled or chemically recycled resin, or a biomass-derived resin such as bionaphtha, and there are no particular restrictions on its shape or form.

[0015] (Polyolefin resin) The detergent composition of this embodiment preferably contains one or more polyolefin resins as thermoplastic resins. As for polyolefin resins, polyethylene resins other than ultra-high molecular weight polyethylene, polypropylene resins, and polybutene resins are preferred. Here, polyethylene resin refers to a homopolymer of ethylene, or a copolymer of ethylene and one or more other monomers, in which the content of structural units derived from ethylene is 50% by mass or more. Polypropylene resin refers to a homopolymer of propylene, or a copolymer of propylene and one or more other monomers, in which the content of structural units derived from propylene is 50% by mass or more. Furthermore, polybutene resin refers to a homopolymer of butene, or a copolymer of butene and one or more other monomers, in which the content of structural units derived from butene is 50% by mass or more.

[0016] Examples of polyethylene-based resins include polyethylene and ethylene-α-olefin copolymers, specifically high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and linear ultra-low-density polyethylene (VLDPE, ULDPE).

[0017] The above ethylene-α-olefin copolymer is preferably a copolymer consisting of ethylene and at least one selected from α-olefins having 3 to 20 carbon atoms, and more preferably a copolymer consisting of ethylene and at least one selected from α-olefins having 3 to 12 carbon atoms. Examples of the above α-olefins include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosane, etc., and one or more of these can be used in combination. Furthermore, as the ethylene-α-olefin copolymer, copolymers of ethylene and at least one comonomer selected from propylene comonomer, butene comonomer, hexene comonomer, and octen comonomer are generally readily available and can be suitably used.

[0018] The polyethylene resin described above can be polymerized using known catalysts such as chromium-based catalysts, Ziegler-based catalysts, and metallocene-based catalysts. From the viewpoint of cleaning performance, chromium-based catalysts or Ziegler-based catalysts with a broad molecular weight distribution are preferred, and chromium-based catalysts or metallocene catalysts having long-chain branching of molecular chains consisting of 6 or more carbon atoms are more preferred. The above polyethylene resins can be used individually or in combination of two or more types.

[0019] From the viewpoint of cleaning performance, the above polyethylene resin preferably has an MFR (at 220°C, under a load of 10 kg) of 0.01 to 30.0 g / 10 min, more preferably 0.05 to 25.0 g / 10 min, and even more preferably 0.10 to 20.0 g / 10 min. Furthermore, from the viewpoint of cleaning performance, the polyethylene resin is preferably MFR (190℃, 21.6kg load) of 1 to 100g / 10min, more preferably 3 to 90g / 10min, and even more preferably 5 to 80g / 10min.

[0020] Examples of the polypropylene-based resins mentioned above include polypropylene, propylene-α-olefin copolymer, and terpolymer of propylene, ethylene, and α-olefin.

[0021] The above-mentioned propylene-α-olefin copolymer refers to a copolymer consisting of propylene and at least one selected from α-olefins. Preferably, the above-mentioned propylene-α-olefin copolymer is a copolymer consisting of propylene and at least one selected from ethylene and α-olefins having 4 to 20 carbon atoms, and more preferably, a copolymer consisting of propylene and at least one selected from ethylene and α-olefins having 4 to 8 carbon atoms. Here, examples of α-olefins having 4 to 20 carbon atoms include 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosane, etc., and one or more of these can be used in combination. These copolymers may be in any form, such as block copolymers or random copolymers, and preferably are random copolymers of propylene and ethylene. As the propylene-α-olefin copolymer mentioned above, copolymers of propylene and at least one comonomer selected from ethylene comonomer, butene comonomer, hexene comonomer, and octen comonomer are generally readily available and can be suitably used.

[0022] As the terpolymer of propylene, ethylene, and α-olefin mentioned above, suitable terpolymers can be propylene, ethylene, and α-olefins such as butene, hexene, and octene. These terpolymers may be in any form, such as block copolymers or random copolymers, and are preferably random copolymers of propylene, ethylene, and butene.

[0023] The above-mentioned polypropylene resin may be not only a resin polymerized with a catalyst such as the Ziegler-Natta catalyst, but also a resin polymerized using a known catalyst such as a metallocene catalyst. For example, syndiotactic polypropylene and isotactic polypropylene can also be used. Furthermore, the above-mentioned polypropylene resin preferably has long-chain branching from the viewpoint of cleaning performance, and branching can be introduced, for example, by grafting or polymerization using ionizing radiation.

[0024] From the viewpoint of cleaning performance, the above polypropylene resin preferably has an MFR (at 220°C and a load of 10 kg) of 0.01 to 30.0 g / 10 min, more preferably 0.05 to 25.0 g / 10 min, and even more preferably 0.1 to 20.0 g / 10 min.

[0025] Since the above-mentioned polybutene-based resin exhibits particularly excellent compatibility with polypropylene-based resins, it is preferable to use it in combination with the above-mentioned polypropylene-based resin for the purpose of adjusting the melt viscosity. As the polybutene-based resin mentioned above, a crystalline copolymer consisting of butene and at least one compound selected from ethylene, propylene, and an olefin compound having 5 to 8 carbon atoms is preferably used.

[0026] The polyolefin resin preferably has an MFR (at 220°C, under a load of 10 kg) of 0.01 to 30.0 g / 10 min, more preferably 0.02 to 25.0 g / 10 min, and even more preferably 0.03 to 20.0 g / 10 min. When the MFR of the polyolefin resin is within the above range, it is easier to adjust the area ratio of the dispersed phase (island-like domains) containing ultra-high molecular weight polyethylene, as described later, to 5% to 60%, which tends to improve color change performance and burn removal performance.

[0027] The thermoplastic resin content is preferably 10 to 90% by mass, more preferably 15 to 85% by mass, and even more preferably 20 to 80% by mass, based on 100% by mass of the detergent composition. When the thermoplastic resin content is within the above range, the fluidity of the detergent composition is good, and the melt viscosity of the detergent composition at 280°C and a shear rate of 70 / s tends to be moderately high.

[0028] (Ultra-high molecular weight polyethylene) The detergent composition of this embodiment preferably contains ultra-high molecular weight polyethylene. Ultra-high molecular weight polyethylene is not particularly limited and includes ethylene homopolymers or copolymers of ethylene with one or more other monomers. The copolymer refers to one in which the content of structural units derived from ethylene is 50% by mass or more. Other monomers mentioned above are not particularly limited, but include, for example, α-olefins such as propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, and 1-eicosane; vinyl compounds such as vinyl acetate; aliphatic unsaturated carboxylic acids such as acrylic acid, methacrylic acid, fumaric acid, and maleic acid; and aliphatic unsaturated carboxylic acid esters such as acrylic acid esters, methacrylic acid esters, fumaric acid esters, and maleic acid esters. Among the ultra-high molecular weight polyethylenes mentioned above, ethylene homopolymers are preferred. Ultra-high molecular weight polyethylene may be used alone or in combination of two or more types.

[0029] It is preferable that the ultra-high molecular weight polyethylene is dispersed in the detergent composition. The dispersion of ultra-high molecular weight polyethylene in a detergent composition means that, when a cross-section of the detergent composition is observed at a magnification of 100 to 10,000 times using a scanning electron microscope (for example, SU6600 manufactured by Hitachi High-Tech Corporation), the morphology of the detergent composition has a phase structure (sea-island structure) in which dispersed phases (island-like domains) containing ultra-high molecular weight polyethylene are dispersed in a matrix phase (sea-like domains) containing thermoplastic resin. The ultra-high molecular weight polyethylene, which is harder than the matrix phase, remains in an immiscible state. This sea-island structure alters the fluidity of the cleaning agent composition, and at 280°C and a shear rate of 70 / s, the melt viscosity of the cleaning agent composition tends to be moderately high. Furthermore, the immiscible and dispersed ultra-high molecular weight polyethylene is thought to exert a scrubbing effect within the cylinder, allowing for more effective cleaning and removal of burnt components even at high cleaning temperatures. In the morphological image of the above-mentioned detergent composition, the area ratio of the dispersed phase (island-like domains) containing ultra-high molecular weight polyethylene dispersed in the detergent composition is preferably 5 to 60%, more preferably 10 to 59%, and even more preferably 15 to 57%. When the area ratio of the dispersed phase (island-like domains) is within this range, the ejection of the detergent composition from the nozzle of the molding machine is suppressed, and burnt components can be more effectively cleaned and removed even at high cleaning temperatures. Methods for dispersing ultra-high molecular weight polyethylene in a detergent composition include, for example, using ultra-high molecular weight polyethylene with a relatively high weight-average molecular weight, using ultra-high molecular weight polyethylene with a relatively large average particle size (D50), adjusting the type and amount of inorganic fillers and other additives, using a screw configured to achieve an appropriate degree of mixing during extrusion kneading, and setting the temperature during extrusion kneading to a temperature that does not generate excessive heat from the resin due to kneading. The morphology of the cleaning agent composition shall be confirmed by exposing the cross-section of the cleaning agent composition pellet using a microtome, cross-section polisher, mechanical polishing, etc., and observing the cross-section at a magnification of 50 to 10,000 times using a scanning electron microscope (for example, Hitachi High-Tech Corporation SU6600) as described above to obtain a morphological image. When using a scanning electron microscope, after embedding and molding the pellet with epoxy resin, sections prepared using a cryo-ultramicrotome, cross-section polisher, mechanical polishing, etc., shall be electron-stained with ruthenium tetroxide vapor and observed. The observation magnification shall be selected to obtain an image in which both the vertical and horizontal lengths of the observed image are in the range of 500 μm to 2000 μm. Furthermore, the area ratio of island-like domains containing ultra-high molecular weight polyethylene is obtained by binarizing the above morphological image using image analysis software (for example, WinROOF2021 manufactured by Mitani Corporation), and calculating the ratio of the area of ​​island-like domains (black areas) containing ultra-high molecular weight polyethylene to the cross-sectional area of ​​the detergent composition pellets in the binarized image (number of pixels corresponding to 1 μm / pixel). If dispersed phases (island-like domains) consisting of components other than ultra-high molecular weight polyethylene are present, the composition of these domains can be confirmed and distinguished from domains containing ultra-high molecular weight polyethylene. For larger domains, analysis using methods such as microscopic infrared spectroscopy or Raman spectroscopy can be performed. For smaller domains, elemental mapping such as scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDX) can be used for inorganic substances, and transmission electron microscopy observation using staining can be used for organic substances.

[0030] The ultra-high molecular weight polyethylene preferably has a weight-average molecular weight of over 500,000 and up to 9,500,000, more preferably over 500,000 and up to 9,200,000, and even more preferably over 600,000 and up to 9,000,000. Having a weight-average molecular weight within this range makes it easier for the ultra-high molecular weight polyethylene to disperse in the detergent composition, resulting in a tendency towards excellent substitutionability. Furthermore, having a weight-average molecular weight within this range makes it easier to manufacture detergent compositions containing a higher proportion of ultra-high molecular weight polyethylene than conventional compositions, and tends to result in superior cleaning performance (removal of discoloration, burns, etc.). However, as the weight-average molecular weight of the ultra-high molecular weight polyethylene increases, attempting to include a larger amount of it increases the motor load (torque) of the kneader, such as a twin-screw extruder, during the kneading of the detergent composition, making the manufacturing of the detergent composition difficult. The weight-average molecular weight of ultra-high molecular weight polyethylene is measured using gel permeation chromatography (GPC), and can be determined specifically by the method described in the examples below. Furthermore, the molecular weight distribution of the components contained in the detergent composition can also be confirmed using GPC.

[0031] The content of ultra-high molecular weight polyethylene is preferably more than 5.0% by mass and 50.0% by mass or less, more preferably more than 9.0% by mass and 45.0% by mass or less, and even more preferably more than 9.0% by mass and 40.0% by mass or less, based on 100% by mass of the detergent composition. In this embodiment, when the content of ultra-high molecular weight polyethylene exceeds 5.0% by mass, the detergent composition tends to have excellent cleaning performance (removal of burns, etc.). Furthermore, when the content is 50.0% by mass or less, the motor load applied to a kneader such as a twin-screw extruder when kneading the detergent composition tends to be within a range that does not cause problems during kneading.

[0032] The method for producing ultra-high molecular weight polyethylene is not particularly limited and can be produced using conventionally known methods with known catalysts such as Ziegler-Natta catalysts.

[0033] (Glass fiber) The cleaning agent composition of this embodiment contains glass fibers, which create a scrubbing effect inside the cylinder, allowing for effective cleaning and removal of burnt-on components. Glass fiber may be used alone or in combination of two or more types.

[0034] For ease of availability, the fiber diameter of the glass fiber is preferably in the range of 5.0 to 15 μm, more preferably 5.5 to 15 μm, and even more preferably 6.0 to 15 μm.

[0035] From the viewpoint of heat resistance and cleaning performance of the cleaning agent composition, the glass fiber content is preferably more than 5.0% by mass and less than 56.0% by mass, more preferably 6.0 to 50.0% by mass, and even more preferably 8.0 to 45.0% by mass, based on 100% by mass of the cleaning agent composition. When the glass fiber content is 5.0% by mass or more, the cleaning effect is easily exhibited, and when it is less than 56.0% by mass, it is easier to adjust the area ratio of the dispersed phase (island-like domains) containing ultra-high molecular weight polyethylene to 5% to 60%, which tends to improve color change performance and burn removal performance.

[0036] (Inorganic fillers other than glass fiber) The cleaning agent composition of this embodiment may also contain inorganic fillers other than glass fibers. In this specification, inorganic fillers refer to inorganic compounds other than the inorganic blowing agents described below, and include both natural and synthetic products. Specific examples of inorganic compounds include talc, mica, wollastonite, xonotlite, kaolin clay, montmorillonite, bentonite, sepiolite, imogolite, sericite, lawsonite, smectite, calcium sulfate fibers, calcium carbonate, magnesium carbonate, titanium dioxide, aluminum hydroxide, magnesium hydroxide, zeolite, diatomaceous earth, glass powder, glass spheres, shirasu balloons, and the like. The inorganic fillers mentioned above may be used individually or in combination of two or more types. The content of inorganic fillers other than glass fibers is preferably 1.0 to 40% by mass, more preferably 1.5 to 35% by mass, and even more preferably 2.0 to 30% by mass, based on 100% by mass of the cleaning agent composition.

[0037] (Other additives) The cleaning agent composition of this embodiment may also contain other additives such as lubricants, surfactants, antioxidants, inorganic foaming agents, mineral oil, paraffin wax, and olefin waxes. The total content of other additives is preferably 10% by mass or less relative to 100% by mass of the detergent composition.

[0038] (Lubricant) Examples of lubricants include, but are not limited to, organic acids, organic acid metal salts, organic acid amides, organic acid esters and other organic acid derivatives, various ester-based waxes, and fluororesins. The lubricant may be a single type or a combination of two or more types.

[0039] The above organic acids are preferably saturated fatty acids with 9 to 28 carbon atoms, unsaturated fatty acids with 9 to 28 carbon atoms, and benzoic acid. They may also have a hydroxyl group in part of the chain. In particular, stearic acid, 12-hydroxystearic acid, palmitic acid, myristic acid, and lauric acid are more preferred from the viewpoint of availability and heat resistance. Mixed fatty acids with different alkyl chains are also acceptable. The above range for the number of carbon atoms is preferable because it does not cause problems with gas generation or odor, and it is readily available and functions well as a lubricant at interfaces.

[0040] The metals used in the above-mentioned organic acid metal salts are not particularly limited, but examples include sodium, potassium, lithium, cesium, magnesium, calcium, aluminum, zinc, iron, cobalt, and barium. Among these, lithium, calcium, barium, zinc, or aluminum are preferred as they exhibit the most effective lubricating properties. Furthermore, aluminum and zinc are more preferred because they have low polarity and readily exhibit external lubricity through bleed-out from thermoplastic resins. Zinc is particularly preferred. The hydrocarbon portion of the above-mentioned organic acid metal salt is preferably a saturated fatty acid with 9 to 28 carbon atoms, an unsaturated fatty acid with 9 to 28 carbon atoms, or benzoic acid, similar to the organic acids described above. From the viewpoint of availability and heat resistance, stearic acid, 12-hydroxystearic acid, palmitic acid, myristic acid, and lauric acid are more preferred.

[0041] Examples of the above-mentioned organic acid amides include saturated fatty acid amides, unsaturated fatty acid amides, saturated fatty acid bisamides, and unsaturated fatty acid bisamides, all having 9 to 28 carbon atoms. Among these, amides of fatty acids with 12 to 18 carbon atoms, such as lauric acid, myristic acid, palmitic acid, and stearic acid, amides of unsaturated fatty acids such as erucic acid, and saturated fatty acid bisamides such as ethylenebisstearic acid amide are preferred from the viewpoint of availability and lubricating effect, and saturated fatty acid bisamides such as ethylenebisstearic acid amide are more preferred.

[0042] Examples of the above-mentioned organic acid esters and ester-based waxes include polyol esters such as saturated fatty acid esters, unsaturated fatty acid esters, medium-chain fatty acid triglycerides, and hydrogenated oils, with 9 to 28 carbon atoms. From the standpoint of availability and lubricating effect, stearate stearate and glycerin fatty acid ester monoglycerides are preferred.

[0043] Examples of the above-mentioned fluororesins include PTFE, PFA, PVDF, PVDF copolymers, ETFE, and PFE, and are expected to have the effect of suppressing resin adhesion to metal surfaces. In terms of shape, various forms such as pellets and powders can be used, but powder form is particularly preferred in order to disperse uniformly during processing. The average particle size is not particularly limited, but 1000 μm or less is preferred.

[0044] From the viewpoint of cleaning performance, the lubricant is preferably one with a surface tension of 32 mN / m or less. For example, zinc stearate has a surface tension of 24 mN / m, and aluminum stearate has a surface tension of 25 mN / m. Furthermore, from the viewpoint of pellet transportability, the lubricant is preferably melting or softening at 70°C or higher, more preferably 80°C or higher, and even more preferably 90°C or higher.

[0045] The lubricant content is preferably 0.1 to 10% by mass, more preferably 0.2 to 10% by mass, and even more preferably 0.5 to 8% by mass, based on 100% by mass of the cleaning agent composition. When the lubricant content is within the above range, it is possible to improve the ease of substitution while maintaining cleaning performance.

[0046] (Surfactants) Examples of surfactants include anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants. Examples of anionic surfactants include alkali salts of higher fatty acids (such as sodium methyl ester of alpha-sulfo fatty acid), alkyl sulfates, alkyl sulfonates, alkylaryl sulfonates, and sulfosuccinate esters. Examples of cationic surfactants include higher amine halates, alkylpyridinium halides, and quaternary ammonium salts. Examples of nonionic surfactants include polyethylene glycol alkyl ethers, polyethylene glycol fatty acid esters, sorbitan fatty acid esters, pentaerythritol fatty acid esters (such as pentaerythritol tetrastearate), and fatty acid monoglycerides. Examples of amphoteric surfactants include amino acids. Surfactants may be used individually or in combination of two or more types.

[0047] The surfactant content is preferably 0.1 to 10% by mass, more preferably 0.2 to 10% by mass, and even more preferably 0.5 to 8% by mass, based on 100% by mass of the detergent composition. When the surfactant content is within the above range, it is possible to improve the ease of substitution while maintaining the cleaning performance.

[0048] (Antioxidant) Examples of antioxidants include phosphorus-based antioxidants and phenolic antioxidants, but the invention is not limited to these. Specific examples of phosphorus-based antioxidants include tris(2,4-di-t-butylphenyl) phosphite, bis(2,4-di-t-butylphenyl)pentaerythritol diphosphite, and 2,2'-methylenebis(4,6-di-t-butyl-1-phenyloxy)(2-ethylhexyloxy) phosphite. Specific examples of phenolic antioxidants include pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, and 4,4'-butylidenebis(6-t-butyl-m-cresol). The antioxidant may be used alone or in combination of two or more types.

[0049] The antioxidant content is preferably 0.01 to 5.0% by mass, more preferably 0.05 to 3.0% by mass, and even more preferably 0.1 to 2.0% by mass, based on 100% by mass of the cleaning agent composition. When the antioxidant content is within the above range, the deterioration of the resin can be suppressed, and the decomposition products of the antioxidant themselves tend to have little inhibitory effect on other additives (such as lubricants).

[0050] (Inorganic foaming agent) In this specification, an inorganic blowing agent refers to an inorganic compound that decomposes upon heating, resulting in foaming, i.e., the generation of gas. Specific examples of inorganic blowing agents include inorganic physical blowing agents such as water, bicarbonates such as sodium bicarbonate, potassium bicarbonate, and ammonium bicarbonate, carbonates such as sodium carbonate, potassium carbonate, and ammonium carbonate, nitrites such as ammonium nitrite, hydrides such as sodium boride, azide compounds such as calcium azide, light metals such as magnesium and aluminum, combinations of sodium bicarbonate and acid, combinations of hydrogen peroxide and yeast, and combinations of aluminum powder and acid, among other known inorganic chemical blowing agents.

[0051] The inorganic foaming agent content is preferably 0.1 to 5.0% by mass, more preferably 0.2 to 4.9% by mass, and even more preferably 0.3 to 4.8% by mass, based on 100% by mass of the detergent composition.

[0052] (Mineral oil) The cleaning agent composition of this embodiment may also contain mineral oil. The above-mentioned mineral oil is an oil obtained by refining petroleum, and is a saturated hydrocarbon oil that also includes naphthenes, isoparaffins, etc., and is also called mineral oil, lubricating oil, or liquid paraffin. Mineral oils with a wide viscosity range can be used; for example, in the case of liquid paraffin, the kinematic viscosity measured according to JIS K2283 is 50 to 500 mmHg. 2 You may also use a viscosity of / s, or one measured by the Redwood method (Japan Oil Chemists' Association Standard Method for Analysis of Oils and Fats 2.2.10.4-1996) in the range of 30 to 2000 (seconds). The mineral oil content is preferably 0.05 to 3.0% by mass, more preferably 0.07 to 2.9% by mass, and even more preferably 0.10 to 2.8% by mass, based on 100% by mass of the detergent composition. The inclusion of mineral oil suppresses excessive mixing during the melting and kneading of the cleaning agent composition, making it easier to form a dispersed phase containing ultra-high molecular weight polyethylene, and allowing for more effective cleaning and removal of burnt components even at high cleaning temperatures.

[0053] (Paraffin wax and olefin-based waxes) The cleaning agent composition of this embodiment may also contain paraffin wax. The paraffin wax mentioned above is a paraffin compound that is solid at room temperature, obtained by refining petroleum, and is commonly used if it has a melting point of 40-80°C. The paraffin wax content is preferably 0.05 to 3.0% by mass, more preferably 0.07 to 2.9% by mass, and even more preferably 0.10 to 2.8% by mass, based on 100% by mass of the cleaning agent composition. Furthermore, while the above-mentioned olefin-based waxes are not particularly limited to low-molecular-weight polyolefins, general low-density or high-density polyethylene, polypropylene, etc., can be used. Waxes with a weight-average molecular weight of approximately 800 to 20,000 and a dropping point of 80 to 180°C tend to be the most effective. The olefin wax content is preferably 0.05 to 3.0% by mass, more preferably 0.07 to 2.9% by mass, and even more preferably 0.10 to 2.8% by mass, based on 100% by mass of the detergent composition.

[0054] (Water content of the detergent composition) The water content of the detergent composition of this embodiment is 1,000 to 30,000 ppm by mass, preferably 2,000 to 20,000 ppm by mass, and more preferably 3,000 to 15,000 ppm by mass. When the water content is within the above range, burnt components can be effectively cleaned and removed even at high cleaning temperatures. The reason for this is not entirely clear, but it is thought that when the water content is moderately high, such as 1000 ppm by mass or more, the plasticity of the cleaning agent composition improves, allowing for effective cleaning and removal of burnt components. Furthermore, if the water content exceeds 30,000 ppm by mass, the cleaning agent composition may foam and spray out from resin outlets such as nozzles and dies during cleaning, reducing work efficiency and potentially posing a risk of burns, making it less economical. There are no particular limitations on how to achieve the above-mentioned moisture content range, but examples include appropriately selecting the type of thermoplastic resin (for example, selecting a resin with higher polarity to increase the moisture content) and appropriately adding other additives. In particular, this can be easily achieved by adding an appropriate amount of metal salt. In this specification, the moisture content refers to the value measured at 185°C using a Karl Fischer moisture meter MKC-510N (manufactured by Kyoto Electronics Manufacturing Co., Ltd.) in accordance with JIS K 7251-B method.

[0055] (Melting viscosity of the detergent composition) The cleaning agent composition of this embodiment has a melt viscosity (hereinafter also referred to as "shear viscosity") of 1,000 to 10,000 Pa·s at a temperature of 280°C and a shear rate of 70 / s, preferably 1,000 to 9,500 Pa·s, and more preferably 1,000 to 9,000 Pa·s. Cleaning agent compositions having such a shear viscosity tend to have excellent cleaning performance (removal of burns, etc.) even at high cleaning temperatures. Furthermore, by keeping the shear viscosity below 10,000 Pa·s, the motor load on the kneader, such as a twin-screw extruder, when kneading the cleaning agent composition can be kept within a range that does not cause problems during kneading, and the ejection of the cleaning agent composition from the nozzle of an injection molding machine, etc., can also be suppressed. Methods for adjusting the shear viscosity to the above range are not particularly limited, but include, for example, appropriately selecting the type of thermoplastic resin (for example, selecting a resin with a lower MFR or a branched resin to increase shear viscosity), adjusting the content of ultra-high molecular weight polyethylene, the weight-average molecular weight, the size and area ratio of the dispersed phase containing ultra-high molecular weight polyethylene in the morphological image, etc., to disperse the ultra-high molecular weight polyethylene well in the detergent composition and increase the shear viscosity, as described above, or adjusting the type and amount of other additives such as inorganic fillers. The melt viscosity at a shear rate of 70 / s and a temperature of 280°C can be measured by the method described in the examples below.

[0056] (MFR of detergent composition) The MFR of the detergent composition of this embodiment is preferably 0.01 g / 10 min or more, more preferably 0.02 g / 10 min or more, and even more preferably 0.03 g / 10 min or more, for ease of use. Furthermore, the MFR of the detergent composition is preferably 40.0 g / 10 min or less, more preferably 20.0 g / 10 min or less, even more preferably 8.0 g / 10 min or less, and particularly preferably less than 3.0 g / 10 min, from the viewpoint of cleaning effect at high cleaning temperatures. Methods for adjusting the MFR to the above range are not particularly limited, but include, for example, appropriately selecting the type of thermoplastic resin, adjusting the content of ultra-high molecular weight polyethylene, the weight-average molecular weight, the size and area ratio of the dispersed phase containing ultra-high molecular weight polyethylene in the morphological image to better disperse the ultra-high molecular weight polyethylene in the detergent composition, and adjusting the type and amount of other additives such as inorganic fillers. In this specification, MFR refers to the value measured under conditions of 220°C and a load of 10 kg, in accordance with ASTM-D1238.

[0057] The cleaning agent composition of this embodiment is suitable for cleaning injection molding machines and extrusion molding machines, and is suitable for cleaning a wide range of molded products after processing, including general-purpose polyolefin resins and engineering plastics with relatively high processing temperatures. In addition to injection molding machines and extrusion molding machines, there are no particular restrictions on the type of machine that plasticizes and molds resins, and machines such as 3D printers may also be used.

[0058] (Method for manufacturing detergent composition) The method for producing the detergent composition of this embodiment is not particularly limited, but for example, it can be produced by pre-mixing each of the above components in a mixer, then kneading and extruding them in an extruder, and finally pelletizing them. In particular, kneading and extruding in a twin-screw extruder rather than a short-screw extruder is preferred in order to adjust the size and area ratio of the dispersed phase containing ultra-high molecular weight polyethylene in the morphological image.

[0059] (Shape of the detergent composition) The shape of the detergent composition in this embodiment is not particularly limited as long as it does not hinder the effects of the present invention, but examples include cylindrical, spherical, flake-like, and powder-like shapes.

[0060] (Cleaning method for resin molding machines) The cleaning method for the resin molding machine of this embodiment uses the cleaning agent composition described above. The cleaning method for resin molding machines according to this embodiment is simple because it does not require immersing the parts of the resin molding machine in the cleaning agent composition, and burnt components can be effectively removed simply by introducing the cleaning agent composition into the resin molding machine. The method may also include a step of allowing the cleaning agent composition to remain inside the resin molding machine. Specific examples of the above-mentioned resin molding machines include injection molding machines and extrusion molding machines. The cleaning method for resin molding machines of this embodiment not only allows for the efficient discharge of materials molded before cleaning, but also has the advantage of preventing thermal degradation of any remaining materials if the cleaning is insufficient and some molded material remains inside the machine when the resin molding machine is shut down after cleaning, by allowing the cleaning agent composition to remain inside the machine. [Examples]

[0061] The embodiment will be described in more detail below with reference to examples and comparative examples. This embodiment is not limited to the following examples unless it exceeds the essence of the embodiment.

[0062] The components used in the examples and comparative examples are as follows: <Thermoplastic resin> (A-1) High-density polyethylene (Asahi Kasei Corporation F184, density 0.952 g / cm³) 3 MFR (220℃, 10kg load): 1.7g / 10min) (A-2) High-density polyethylene (Hyzex 6203B manufactured by Prime Polymer Co., Ltd., density 0.956 g / cm³) 3MFR (220℃, 10kg load): 9.4g / 10min) (A-3) High-density polyethylene (B161 manufactured by Asahi Kasei Corporation, density 0.963 g / cm³) 3 MFR (220℃, 10kg load): 19.4g / 10min) (A-4) High-density polyethylene (J345, manufactured by Asahi Kasei Corporation, density 0.956 g / cm³) 3 MFR (220℃, 10kg load): 86.2g / 10min) (A-5) High-density polyethylene (J300 manufactured by Asahi Kasei Corporation, density 0.961 g / cm³) 3 MFR (220℃, 10kg load): 100g / 10min or more, MFR (190℃, 2.16kg load): 42.6g / 10min) (A-6) Low-density polyethylene (M2206 manufactured by Asahi Kasei Corporation, density 0.923 g / cm³) 3 MFR (220℃, 10kg load): 11.7g / 10min) (A-7) Polypropylene (PB222A, manufactured by Sun Allomer Co., Ltd., density 0.900 g / cm³) 3 MFR (220℃, 10kg load): 10.8g / 10min)

[0063] <Ultra-high molecular weight polyethylene> (B-1) Ultra-high molecular weight polyethylene polymer (UH950 manufactured by Asahi Kasei Corporation, weight-average molecular weight: 4 million) (B-2) Ultra-high molecular weight polyethylene polymer (GUR4150 manufactured by Celanese, weight-average molecular weight: 8.7 million) (B-3) Ultra-high molecular weight polyethylene polymer (UH850 manufactured by Asahi Kasei Corporation, weight-average molecular weight: 2 million) (B-4) Ultra-high molecular weight polyethylene polymer (BH500 manufactured by Asahi Kasei Corporation, weight-average molecular weight 500,000) The weight-average molecular weight of the above-mentioned ultra-high molecular weight polyethylene was measured using an ultra-high temperature GPC (manufactured by Senshu Kagaku Co., Ltd.), with 1-chloronaphthalene as the eluent and polystyrene as the standard substance, at a column temperature of 210°C.

[0064] <Glass fiber> (GF) Glass fiber (ECS-03-T-351 manufactured by Nippon Electric Glass Co., Ltd.)

[0065] <Other additives> (MO) Mineral oil (weight average molecular weight: 500, kinematic viscosity 95 mm 2 / s) (PEW) Polyethylene wax (Hiwax 220P manufactured by Mitsui Chemicals, Inc., weight average molecular weight: 2000, density: 0.920 g / cm 3 , softening point: 113 °C) (PPW) Polypropylene wax (Biscoal 550-P manufactured by Sanyo Chemical Industries, Ltd., weight average molecular weight: 15000, softening point: 152 °C) ·Lubricant (Zn-St) Zinc stearate (Zinc Stearate G manufactured by NOF Corporation) ·Inorganic foaming agent (Sodium bicarbonate) Sodium hydrogen carbonate (Potassium bicarbonate) Potassium hydrogen carbonate ·Inorganic filler (Calcium carbonate) Calcium carbonate (TW-300s manufactured by Okutama Kogyo Co., Ltd.)

[0066] The measurement and evaluation methods of the detergent compositions obtained in the examples and comparative examples are as follows.

[0067] [Morphology of detergent composition, area ratio of dispersed phase containing ultra-high molecular weight polyethylene] For the examples and comparative examples containing a thermoplastic resin and ultra-high molecular weight polyethylene, the cross-section of the obtained detergent composition pellets was exposed by mechanical polishing, and a morphology image was obtained using a scanning electron microscope (SU6600 manufactured by Hitachi High-Tech Corporation). When using the scanning electron microscope, the detergent composition pellets were embedded and molded with an epoxy resin, and after obtaining sections using mechanical polishing, a sample was prepared by electron beam staining with ruthenium tetroxide vapor, and the morphology of the detergent composition was observed at a magnification of 100 times to obtain a morphology image. The sea-island structure of the morphological image was binarized using image analysis software (WinROOF2021, manufactured by Mitani Corporation), resulting in a binarized image (approximately 848 μm × 1196 μm, with a pixel count equivalent to 1 μm / pixel). The areas of the white portion (including the matrix phase containing thermoplastic resin (sea-like domains) and the dispersed phase containing GF (island-like domains)) and the black portion (dispersed phase containing ultra-high molecular weight polyethylene (island-like domains)) were calculated separately. The area ratio of the black portion was determined using the formula (Area ratio = Area of ​​black portion = (Area of ​​white portion + Area of ​​black portion) × 100), and this was used as the area ratio of the dispersed phase containing ultra-high molecular weight polyethylene (island-like domains). Furthermore, when the morphological images included epoxy resin used for embedding or voids, these were excluded before calculating the area of ​​each component. In addition, the observed black areas were confirmed to consist solely of dispersed phases (island-like domains) containing ultra-high molecular weight polyethylene using contrast analysis and SEM-EDX.

[0068] [MFR] The MFR (g / 10min) of the detergent composition was measured at 220°C and under a load of 10 kg, in accordance with ASTM-D1238. The sample was pre-dried at 80°C for 4 hours. Furthermore, for samples where the MFR value at 220°C and a load of 10kg was 100g / 10min or higher, the MFR was measured at 190°C and a load of 2.16kg.

[0069] [Moisture content] The water content (mass ppm) of the detergent composition was measured using a Karl Fischer moisture meter (MKC-510N, manufactured by Kyoto Electronics Manufacturing Co., Ltd.) in accordance with JIS K 7251-B method (moisture vaporization method). The mass of the detergent composition sample was 0.2 g to 4 g. The vaporization temperature of the detergent composition was 185°C, and the vaporization time was 20 minutes. The sample was pre-treated by letting it stand at 30°C and 80% RH for 3 days.

[0070] [Shear viscosity] Using a twin capillary rheometer (Malvern RH10) at a temperature of 280°C, and using orifice dies of a long die (L / d=16, diameter 1mm, inlet angle 90°) and a short die (L / d=0.25, diameter 1mm, inlet angle 90°), the measurement was performed in twin Burglai ​​mode at a shear rate of 70s. -1 The shear stress was measured, and the shear viscosity η (Pa·s) was determined according to Cogswell's theoretical formula (Polymer Engineering Science, 12, 64 (1972)). The sample used was pre-dried at 80°C for 4 hours. Note that only Bagley correction was used for data correction; Rabinowitsch correction was not used. Shear viscosity η[kPa s]=Tc / γ Apparent shear rate γ[s -1 ]=4Q / ((πd3) / 8) Corrected shear stress Tc[kPa] = (Pl-Po)d / 4L (In the formula, Q: volumetric flow rate, d: diameter of the die tube (mm), Pl: pressure loss on the long die side, Ps: pressure loss on the short die side, Po: pressure equivalent to zero thickness on the short die side, or the pressure at which L / d=0 obtained by extrapolating from the Pl-Ps value, and n: power-low index (n=1, 2, 3, 4...).)

[0071] [Burning removal performance] 150g of polyamide resin was placed in a small extruder (Bravender Plasticorder) heated to 280°C, and the screw was rotated to discharge the resin from the nozzle, causing it to adhere to the inside of the small extruder. The extruder was then left at the same temperature for 90 minutes to create burn marks on the remaining polyamide resin inside the extruder. Subsequently, 100g of a cleaning agent composition was added to the extruder to clean the inside. Subsequently, the screw was removed, the amount of remaining burnt residue on the screw surface was measured, and the cleanability (burnt residue removal performance) was evaluated according to the following criteria. -Evaluation Criteria- A (Excellent): The burnt residue has been completely removed from the screw. B (Good): Discoloration remains on the screw, but the remaining area is less than 30% of the total surface area of ​​the screw. C (Defective): Burn marks remain on the screw, and the remaining area is 30% or more of the total surface area of ​​the screw.

[0072] [Discharge of cleaning agent composition in a molding machine] 1000g of a cleaning agent composition was added to an injection molding machine (Shibaura Machine Co., Ltd., EC100S) with a clamping force of 100t, heated to 280℃, and purging was performed at a rotation speed of 60rpm. The presence or absence of spraying of the cleaning agent composition from the nozzle was checked after purging for 3 minutes. Those with spraying were evaluated as C (poor), and those without spraying were evaluated as A (good).

[0073] [Examples 1-15, Comparative Examples 1, 3-6] <Preparation of detergent composition> Compositions containing each component in the proportions shown in Table 1 were pre-mixed for 5 minutes using a tumbler blender, and the resulting mixture was kneaded using a twin-screw extruder (TEM26SX, manufactured by Toshiba Machine Co., Ltd.). The kneading conditions were a cylinder temperature of 290°C and an extrusion rate of 10 kg / hour. The resulting molten mixture was extruded into strands, cooled with water, and then cut with a strand cutter to obtain pellet-shaped cleaning agent compositions. Table 1 shows the evaluation results for each example and comparative example.

[0074] [Comparative Example 2] Compositions containing each component in the proportions shown in Table 1 were pre-mixed for 5 minutes using a tumbler blender, and the resulting mixture was kneaded using a single-screw extruder (VS-30, manufactured by Tanabe Plastic Machinery Co., Ltd.). The kneading conditions were a cylinder temperature of 290°C and an extrusion rate of 10 kg / hour. The resulting molten mixture was extruded into strands, cooled with water, and then cut with a strand cutter to obtain pellet-shaped cleaning agent compositions.

[0075] [Table 1] [Industrial applicability]

[0076] The cleaning agent composition of the present invention is particularly useful as a cleaning agent for resin molding machines used in injection molding and extrusion molding of thermoplastic resins, as it can effectively and easily remove burnt components derived from the molding raw material resin even at high cleaning temperatures.

Claims

1. The material comprises glass fiber, ultra-high molecular weight polyethylene, and thermoplastic resins other than the ultra-high molecular weight polyethylene. The moisture content is between 1,000 ppm by mass and 30,000 ppm by mass. The melt viscosity at 280°C and a shear rate of 70 / s is 1000 Pa·s or more and 10000 Pa·s or less. In the morphological image of the aforementioned cleaning agent composition for resin molding machines, a phase structure is formed in which the dispersed phase containing the ultra-high molecular weight polyethylene is dispersed in the matrix phase containing the thermoplastic resin. A cleaning agent composition for resin molding machinery, characterized by the following features.

2. A cleaning agent composition for resin molding machinery according to claim 1, comprising more than 5.0% by mass and 50.0% by mass or less of ultra-high molecular weight polyethylene.

3. The cleaning agent composition for resin molding machinery according to claim 1 or 2, wherein the area ratio of the dispersed phase containing the ultra-high molecular weight polyethylene is 5% or more and 60% or less.

4. The cleaning agent composition for resin molding machinery according to claim 1 or 2, wherein the content of the glass fiber is more than 5.0% by mass and less than 56.0% by mass.

5. A cleaning agent composition for resin molding machinery according to claim 1 or 2, wherein the MFR at 220°C and a load of 10 kg is 0.01 g / 10 min or more and less than 3.0 g / 10 min.

6. The cleaning agent composition for resin molding machinery according to claim 1 or 2, wherein the thermoplastic resin comprises one or more polyolefin resins, and the MFR of the one or more polyolefin resins at 220°C and a load of 10 kg is 0.01 g / 10 min or more and 30.0 g / 10 min or less.

7. The cleaning agent composition for resin molding machinery according to claim 1 or 2, wherein the weight-average molecular weight of the ultra-high molecular weight polyethylene is more than 500,000 and 9,500,000 or less.

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