TW201934737A - Molding machine cleaning agent - Google Patents

Abstract

To provide a molding machine cleaning agent, which has both excellent cleaning properties and excellent fluidity. A molding machine cleaning agent according to the present invention contains (A) a thermoplastic ultra high molecular weight polymer, (B) a thermoplastic resin and (C) a condensed hydroxy fatty acid and/or an alcohol ester thereof. According to one embodiment of the present invention, the thermoplastic ultra high molecular weight polymer (A) is an ultra high molecular weight polyethylene resin; and the thermoplastic ultra high molecular weight polymer (A) has a viscosity-average molecular weight of from 300,000 to 15,000,000.

Description

Forming machine cleaner

The present invention relates to a cleaning agent for a molding machine. More specifically, the present invention relates to a molding machine cleaner for washing the inside of a molding machine such as an extrusion molding machine used to melt and mold a thermoplastic resin or a rubber material.

Generally, a molding machine (extruder, injection machine) is used for purposes such as resin coloring, mixing, and molding. When a resin is processed using such a molding machine, resin, additives, etc. remain in the molding machine when a predetermined operation is completed. This residue is mixed with the molded product when the molding material to be charged is changed after the change, and causes the appearance of the product to be poor. This phenomenon poses a particular problem when continuously processing forming materials of different colors. The conventional method for removing the residue from the molding machine is known: a method for manually disassembling and cleaning the molding machine, a method for gradually replacing the residue with a changed molding material, and a method for using a detergent.

The conventional cleaning method is used to continuously process molding materials with extremely different colors, continuously processing resins with greatly different characteristics, and long-term production. After the screw is removed from the machine, the washing operation of the inside of the extruder and the screw of the forming machine must take time. In recent years, due to the requirements of small batch production and multi-variety production, the cleaning operation burden (operation time, operation cost) has increased.

[Prior technical literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 2015-010174

Patent Document 2: Japanese Patent Laid-Open No. 2006-335913

Patent Document 3: Japanese Patent Laid-Open No. 2001-150456

When cleaning a molding machine that disposes of thermoplastic resin, if conventional detergents are used, there will be a problem of insufficient cleaning. Even if the cleaning force is sufficient, the screw extraction operation may occur due to low fluidity. More difficult issues. When a low fluidity detergent is used, it is necessary to replace the low fluidity detergent with a high fluidity resin or detergent. As a result, conventional cleaning operations require a large amount of detergent and / or time.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a molding machine cleaner having excellent detergency and fluidity.

The molding machine detergent of the present invention contains a thermoplastic ultra high polymer (A), a thermoplastic resin (B), and a condensed hydroxy fatty acid and / or an alcohol ester (C) thereof.

In one embodiment, the thermoplastic ultra high polymer (A) is an ultra-high molecular weight polyethylene resin, and the thermoplastic ultra high polymer (A) has an average molecular weight of 300,000 to 15 million.

In one embodiment, the content ratio of the thermoplastic ultra polymer (A) is 10 to 50 parts by weight based on 100 parts by weight of the resin in the molding machine detergent.

In one embodiment, the thermoplastic resin (B) is a polyolefin-based resin.

In one embodiment, the content ratio of the condensed hydroxy fatty acid and its alcohol ester (C) is 0.1 to 30 parts by weight based on 100 parts by weight of the resin in the molding machine detergent.

In one embodiment, the degree of condensation of the condensed hydroxy fatty acid is 2 or more.

In one embodiment, the alcohol ester of the above-mentioned condensed hydroxy fatty acid is a reaction product of a condensed hydroxy fatty acid having an condensation degree of 2 or more and an alcohol.

In one embodiment, the molding machine cleaner further contains an inorganic substance (D).

In one embodiment, the content ratio of the inorganic substance (D) is 10 to 100 parts by weight based on 100 parts by weight of the resin in the molding machine cleaner.

In one embodiment, the inorganic substance (D) is at least one selected from the group consisting of a silicate compound, calcium carbonate, and glass fiber.

According to the present invention, by adding a condensed hydroxy fatty acid and / or its alcohol ester to a molding machine cleaner containing a thermoplastic ultrahigh polymer (especially an ultra-high molecular weight polyethylene resin), it is possible to obtain cleaning properties and Molding machine cleaner with excellent fluidity. In addition, the molding machine cleaner of the present invention can be easily peeled from the metal, and has excellent operability when cleaning the molding machine.

The molding machine detergent of the present invention contains a thermoplastic ultra-high polymer (A), a thermoplastic resin (B), a condensed hydroxy fatty acid and / or an alcohol ester (C) thereof (hereinafter also referred to as "compound (C)"). . In addition, the thermoplastic ultra polymer (A) and the thermoplastic resin (B) are distinguished by the viscosity average molecular weight. In the present specification, the thermoplastic resin (B) refers to A resin having a viscosity average molecular weight smaller than that of a thermoplastic ultrahigh polymer (A).

In the present invention, by using a condensed hydroxy fatty acid and / or its alcohol ester (C), the thermoplastic ultra high polymer (A) can be used as a component of a molding machine detergent. More specifically, when the thermoplastic ultra-high polymer (A) and the thermoplastic resin (B) are kneaded, by adding a condensed hydroxy fatty acid and / or an alcohol ester (C) thereof, it can be extremely difficult to use it. The thermoplastic ultra high polymer (A) extruded by an extrusion molding machine is used as a component of the molding machine detergent. The molding machine detergent of the present invention containing a thermoplastic ultrahigh polymer (A), a thermoplastic resin (B), and a condensed hydroxy fatty acid and / or its alcohol ester (C) has excellent detergency, and can be used sufficiently when used in a small amount. Wash effect. The molding machine detergent of the present invention is as described above, and has excellent fluidity and good peelability.

The melt flow rate of the forming machine cleaner of the present invention at 250 ° C and 5 kgf is preferably 2 g / 10 min or more, more preferably 3 g / 10 min or more, particularly good 5 g / 10 min or more, and most preferably 8 g / 10 min. the above. If it is in such a range, the said effect will become remarkable. The upper limit of the melt flow rate is, for example, 50 g / 10 min. The melt flow rate can be measured in accordance with the method of JISK7210.

A. Thermoplastic Ultra Polymer (A)

The above-mentioned thermoplastic ultra high polymer (A) is provided before the effects of the present invention can be obtained, and any appropriate resin can be used. Examples of the thermoplastic ultra-high polymer (A) system include an ultra-high molecular weight polyethylene resin, an ultra-high molecular weight styrene-acrylonitrile resin, an ultra-high molecular weight methyl methacrylate resin, and the like. Among them, an ultra-high molecular weight polyethylene-based resin is preferred. By using an ultra-high molecular weight polyethylene-based resin, a molding machine cleaner having excellent detergency and releasability can be obtained. Containing ultra-high-molecular-weight polyethylene-based resins for obtaining compositions that can be effectively used as detergents for molding machines are also the fruits of the present invention. one.

The viscosity average molecular weight of the thermoplastic ultra polymer (A) is preferably 300,000 to 15 million, more preferably 500,000 to 12 million, even more preferably 1 million to 10 million, especially good 2 million to 10 million. Jia line 3 million to 7 million. Within this range, a molding machine cleaner having excellent detergency, fluidity, and releasability can be obtained. The viscosity average molecular weight can be measured by a viscosity method prescribed by ASTMD4020.

The content ratio of the thermoplastic ultra high polymer (A) is preferably 10 to 50 parts by weight, and more preferably 20 to 40 parts by weight based on 100 parts by weight of the resin in the molding machine detergent. Within this range, a molding machine cleaner having excellent detergency, fluidity, and releasability can be obtained.

A-1. Ultra-high molecular weight polyethylene resin (A)

The viscosity average molecular weight of the ultra-high molecular weight polyethylene resin (A) is preferably 300,000 to 15 million, more preferably 500,000 to 12 million, even more preferably 1 to 10 million, and particularly good 2 to 10 million. The best department is 3 million to 7 million. Within this range, a molding machine cleaner having excellent detergency, fluidity, and releasability can be obtained. The molding machine cleaner may contain two or more ultra-high molecular weight polyethylene resins (A) having different molecular weights.

The ultra-high-molecular-weight polyethylene-based resin (A) is a resin obtained by polymerizing a monomer composition containing ethylene as a main component (a monomer composition having the largest ethylene content among the total monomers). The ultra-high molecular weight polyethylene resin (A) may be a homopolymer of ethylene or a copolymer of ethylene and other monomers capable of copolymerizing with the ethylene. In the ultra-high molecular weight polyethylene resin (A), the content ratio derived from the ethylene constituent unit is preferably 80 mol% or more, more preferably 90 mol% or more, and particularly preferably 95 mol% or more.

Examples of other single systems capable of copolymerizing with ethylene include α-olefins having 3 or more carbon atoms (preferably 3 to 20 carbon atoms). Examples of the α-olefin system having 3 or more carbon atoms include propylene, 1-butene, isobutylene, 1-pentene, 2-methyl-1-butene, 3-methyl-1-butene, and 1-olefin. Hexene, 3-methyl-1-pentene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene Ene, 1-hexadecene, 1-octadecene, 1-pinene and the like.

The ultra-high molecular weight polyethylene resin (A) can be produced by any appropriate method. For example, using the method described in Japanese Patent Laid-Open No. 58-83006, it can be obtained by polymerizing the above monomers in the presence of any appropriate catalyst.

B. Thermoplastic resin (B)

The viscosity average molecular weight of the thermoplastic resin (B) is lower than the viscosity average molecular weight of the thermoplastic superpolymer (A), and the rest is not particularly limited. The viscosity average molecular weight of the thermoplastic resin (B) is, for example, 1 million or less, and preferably less than 300,000. By containing the thermoplastic resin (B), a molding fluid cleaner having a high fluidity can be obtained.

The melt flow rate of the thermoplastic resin (B) at 190 ° C and 2.16 kgf is preferably 0.05g / 10min ~ 100g / 10min, more preferably 0.1g / 10min ~ 100g / 10min, and particularly good 10g / 10min ~ 90g / 10min, the best is 20g / 10min ~ 80g / 10min. If it is in such a range, it is possible to obtain a molding machine cleaner which is excellent in fluidity and which fully exhibits the characteristics derived from the thermoplastic ultra high polymer (A).

Examples of the thermoplastic resin (B) include olefin-based resins (for example, homopolymers of α-olefins, copolymers composed of two or more α-olefins, and the like).

The α-olefin constituting the thermoplastic resin (B) preferably has a carbon number of 2 to 10 α-olefins, more preferably α-olefins having 2 to 8 carbon atoms, particularly preferably ethylene, propylene or 1-butene.

In one embodiment, the thermoplastic resin (B) is a polyethylene resin other than the ultra-high molecular weight polyethylene resin (A). The content ratio of the polyethylene-based resin in the polyethylene-based resin is preferably 80 mol% or more, more preferably 90 mol% or more, and particularly preferably 95 mol% or more. Examples of the structural unit derived from a structural unit other than ethylene include structural units derived from a monomer copolymerizable with an ethylene copolymer, and examples thereof include propylene, 1-butene, isobutylene, 1-pentene, 2-methyl-1-butene, 3-methyl-1-butene, 1-hexene, 3-methyl-1-pentene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-pinene and the like.

The content ratio of the thermoplastic resin (B) is preferably from 10 to 90 parts by weight, more preferably from 15 to 90 parts by weight, and particularly preferably 20 to 100 parts by weight of the resin in the molding machine detergent. Part by weight to 80 parts by weight, preferably 30 parts by weight to 70 parts by weight. If it is in such a range, it is possible to obtain a molding machine cleaner which is excellent in fluidity and which fully exhibits the characteristics derived from the thermoplastic ultra high polymer (A).

C. Condensed hydroxy fatty acid and / or its alcohol ester (C)

In the present invention, by containing a condensed hydroxy fatty acid and / or its alcohol ester (C), even if the resin component contains a thermoplastic ultra high polymer (A), it can be effectively used as a molding machine cleaner.

The condensed hydroxy fatty acid is obtained by subjecting a hydroxy fatty acid to dehydration condensation. The condensed hydroxy fatty acid is obtained by adding an alkali catalyst such as caustic soda to the hydroxy fatty acid, and removing the reaction water under heating to perform dehydration condensation.

The above condensed hydroxy fatty acid is a condensate of hydroxy fatty acid, and its condensation The degree of combination is preferably 2 or more, and more preferably 4 or more. The upper limit of the degree of condensation of the condensed hydroxy fatty acid is, for example, 20. The "condensation degree" can be calculated from the acid value of the raw material hydroxy fatty acid and the acid value after the condensation reaction.

The hydroxy fatty acid is a fatty acid having one or more hydroxyl groups in the molecule. Specific examples of the hydroxy fatty acid include, for example, ricinoleic acid, 12-hydroxystearic acid, osmic acid, 2-hydroxytetradecanoic acid, ipuroru acid, 2-hydroxyhexadecanoic acid, morning glory Stearic acid, Junipic acid, music acid, aleuritic acid, 2-hydroxyoctadecanoic acid, 18-hydroxyoctadecanoic acid, 9,10-dihydroxyoctadecanoic acid, crude branwood Acids (kamlolenic acid), phellonic acid, ceretonone and the like. The hydroxy fatty acid may be used singly or in combination of two or more kinds.

An alcohol ester of a condensed hydroxy fatty acid can be obtained by esterifying a condensed hydroxy fatty acid with an alcohol. An alcohol ester of a condensed hydroxy fatty acid is obtained by, for example, mixing the above-mentioned condensed hydroxy fatty acid with an alcohol, adding an alkali catalyst such as caustic soda or an acid catalyst such as phosphoric acid to the obtained mixture, and removing the reaction water under heating. The degree of progress of esterification in this reaction can be confirmed by measuring the acid value, saponification value, hydroxyl value, and the like. The degree of condensation of the condensed hydroxy fatty acid used here is also as described above, preferably 2 or more, and more preferably 4 or more.

Examples of the alcohols include: monohydric alcohols such as methanol, ethanol, and isopropanol; and dihydric alcohols such as ethylene glycol and propylene glycol. Moreover, the said alcohol can also use a polyhydric alcohol. Examples of the polyhydric alcohols include: alkane polyols such as pentaerythritol and glycerol; polyalkane polyols of polymers of the alkane polyol; sugars such as sucrose; sugar derivatives represented by sugar alcohols such as sorbitol and mannitol; and the like. These alcohols may be used alone or in combination of two or more.

Condensed hydroxy fatty acids synthesized using the above compounds as raw materials and / Specific examples of the alcohol ester (C) thereof include, for example, condensation ramie oleic acid which is dehydrated and condensed with ramie oleic acid, and condensation 12-hydroxystearic acid which is dehydrated and condensed with 12-hydroxystearic acid. Condensation of hexaglyceride of ramie oleic acid and hexaglycerol, hexaglyceride of ramie oleic acid, tetraglyceride of ramie oleic acid and tetraglyceride of condensed ramie oleic acid and tetraglyceride, 12-hydroxystearate Condensation of acid and propylene glycol esters 12-hydroxystearic acid propylene glycol esters, condensation of linseed oleic acid and propylene glycol esters of linolenic acid linoleic acid propylene glycol esters, and the like. These systems may be used alone or in combination of two or more.

The content ratio of the condensed hydroxy fatty acid and its alcohol ester (C) is preferably 0.2 to 30 parts by weight, more preferably 0.2 to 20 parts by weight, relative to 100 parts by weight of the resin in the molding machine detergent. Still more preferred are 0.2 to 15 parts by weight, particularly preferred are 0.5 to 15 parts by weight, and most preferred are 0.5 to 10 parts by weight. Within this range, a molding machine cleaner having excellent detergency and fluidity can be obtained. The "content ratio of the condensed hydroxy fatty acid and its alcohol ester (C)" means the total content ratio of the condensed hydroxy fatty acid and the alcohol ester of the condensed hydroxy fatty acid. Therefore, when the compound (C) of the above-mentioned molding machine detergent contains only condensed hydroxy fatty acids, the so-called "content ratio of the condensed hydroxy fatty acid and its alcohol ester (C)" means the content ratio of the condensed hydroxy fatty acid. In addition, when the compound (C) of the above-mentioned molding machine detergent is an alcohol ester containing only a condensed hydroxy fatty acid, the so-called "content ratio of the condensed hydroxy fatty acid and its alcohol ester (C)" means an alcohol ester of the condensed hydroxy fatty acid Content ratio.

D. Inorganic (D)

In one embodiment, the molding machine detergent of the present invention further contains an inorganic substance (D). By containing an inorganic substance (D), the cleaning property and peeling property of a molding machine cleaner can be further improved.

The content of the inorganic substance (D) is preferably 10 to 100 parts by weight, more preferably 15 to 90 parts by weight, and 30 parts by weight based on 100 parts by weight of the resin in the molding machine detergent. ~ 70 parts by weight.

The inorganic substance (D) is mentioned before the effect of the present invention can be obtained, and any appropriate inorganic substance can be used. Examples of the inorganic substance (D) include silicate compounds, metal oxides, metal hydroxides, metal carbonates, and metal sulfates. Examples of silicate compounds include: wollastonite, zeolite, talc, mica, clay, montmorillonite, bentonite, activated clay, sepiolite, imogolite, sericite, glass (Glass fiber, glass beads, silica balloons, glass fragments, etc.). Examples of the metal oxide system include silicon dioxide, aluminum oxide, titanium oxide, calcium oxide, magnesium oxide, zinc oxide, iron oxide, antimony oxide, tin oxide, and diatomaceous earth. Examples of the metal hydroxide system include calcium hydroxide, magnesium hydroxide, and aluminum hydroxide. Examples of the metal carbonate include calcium carbonate, magnesium carbonate, zinc carbonate, barium carbonate, and hydrotalcite. Examples of the metal sulfate system include calcium sulfate and barium sulfate. Among them, a silicate compound (particularly, talc), calcium carbonate, or glass fiber is preferred. These inorganic substances (D) may be used individually by 1 type, and may use 2 or more types together.

E. Other ingredients

The molding machine cleaner of the present invention may further contain any appropriate additive, if necessary. Examples of additives include stabilizers such as heat stabilizers and weathering agents; colorants such as pigments and dyes; slip agents, cross-linking agents, cross-linking aids, anti-sticking agents, anti-static agents, anti-fog agents, and organic fillers. , Inorganic fillers, etc.

F. Manufacturing method of forming machine detergent

The molding machine detergent of the present invention can be produced by any appropriate method. The production method may be, for example, melting a thermoplastic ultra-high polymer (A), a thermoplastic resin (B), a condensed hydroxy fatty acid and / or its alcohol ester (C), and an inorganic substance (D) added as required, and melting the same. Kneading method (melt blending method). Examples of the melt-kneading method include a method using a single-shaft extruder, a multi-shaft extruder, a tandem extruder, and a Banbury mixer. If the above-mentioned resin is melt-kneaded in the presence of the condensed hydroxy fatty acid and / or its alcohol ester (C), the generation of lumps can be suppressed, and a molding machine detergent having a good resin dispersion state can be obtained. The inorganic substance (D) may be added after the melt-kneading operation.

The processing temperature during the melt-kneading is preferably a temperature at which the resin contained in the molding machine detergent can be melted. The temperature is, for example, 100 ° C to 330 ° C.

The molding machine using the cleaning agent of the molding machine of the present invention is not particularly limited, such as: single-shaft or double-shaft extruder, plastic grinder, kneader, Banbury mixer, plastic spectrometer, etc. Various mixing devices or injection molding machines used.

[Example]

Hereinafter, the present invention is described in more detail using examples, but the present invention is not limited in any way by these examples. In addition, "part" and "%" are based on "weight basis" unless otherwise stated.

[Example 1]

42.5 parts by weight of thermoplastic ultra polymer (ultra high molecular weight polyethylene resin, manufactured by Asahi Kasei Chemicals, trade name "Sanfain UH901", viscosity average molecular weight: 3 million), thermoplastic resin (polyethylene resin, Asahi Kasei Chemicals Corporation) (Trade name: Suntec J300), 100 parts by weight of MFR (190 ° C / 2.16kgf): 40g / 10min, and an alcohol ester of condensed hydroxy fatty acid (condensed ramie oleate tetraglyceride, hydroxy fatty acid) Condensation degree: 10) 7 parts by weight, melt-kneaded with a biaxial extruder (manufactured by Toshiba Machinery Co., Ltd. under the trade name "TEM26SS") to obtain a pellet-shaped molding machine cleaner.

[Examples 2 to 8, Comparative Examples 1 to 6]

In addition to the blending amounts of the above-mentioned thermoplastic ultra-high polymer (ultra-high molecular weight polyethylene-based resin), the above-mentioned thermoplastic resin (polyethylene-based resin), and the above-mentioned alcohol ester of condensed hydroxy fatty acid (condensed ramie oleic acid tetraglyceride), Except for the amounts shown in Table 1, the rest were the same as in Example 1 to obtain a molding machine cleaner.

In Examples 2 and 6, and Comparative Examples 2 and 4, ultrahigh molecular weight polyethylene resins (made by Asahi Kasei Chemicals Corporation, trade name "Sanfain UH850", viscosity average molecular weight: 2 million) were used for the thermoplastic ultrahigh polymer system. . In Example 4, an ultrahigh molecular weight polyethylene resin (manufactured by Asahi Kasei Chemicals, trade name "Sanfain UH951", viscosity average molecular weight: 4.5 million) was used for the thermoplastic ultrahigh polymer system. In Example 5, an ultra-high molecular weight polyethylene resin (manufactured by Asahi Kasei Chemicals, trade name "Sanfain UH981", viscosity average molecular weight: 7 million) was used.

In addition, in Examples 2 to 8 and Comparative Examples 2 to 6, the following inorganic substances were further blended according to the blending amounts shown in Table 1, and melt-kneaded.

Examples 2 to 5 and 8, and Comparative Examples 2 to 3 and 6: Talc (manufactured by Hayashi Chemical Co., trade name "TALCAN PAWDER PK-C", average particle size: 12.1 μm)

Examples 6 to 8 and Comparative Examples 4 to 5: Glass fiber (manufactured by Nippon Electric Glass Co., Ltd. under the trade name "Glass Cut ECS03T-187", fiber length 3.7 mm, fiber diameter 13.1 μm)

<Evaluation>

The molding machine cleaners obtained in the examples and comparative examples were provided for the following evaluations. price. The results are shown in Table 1.

(1) Amount of detergent used

As the testing machine, a biaxial extruder (TEM18, manufactured by Toshiba Machinery Co., Ltd.) was used. The extruder temperature of this biaxial extruder was set to 250 ° C., and a polybutylene terephthalate (PBT) black colored resin was poured into the biaxial extruder. After confirming that the PBT black colored resin was extruded from the die, the PBT black colored resin was caused to flow out of the biaxial extruder while the screw was rotated, until it no longer flowed out of the die.

Then, the molding machine detergent is poured into the biaxial extruder until the black colored resin attached to the molding machine detergent extruded from the die is discolored, and the color tone does not change. weight.

(2) Ease of screw extraction

After the above operation (1), the die was released, and the screw was rotated to cause the molding machine detergent in the biaxial extruder to flow out, and the screw was pulled out to evaluate the ease of screwing out.

In Table 1, the case where the screw is particularly easy to withdraw is rated as "◎", the case where the screw can be easily pulled out is rated as "○", and the case where the screw is pulled out requires a load and a practical problem is rated as "△". A case where the load is heavy and human labor is difficult to extract is rated as "×".

(3) Metal peelability

After the above-mentioned operation (1), the peelability was confirmed from the adhesion surface of the molding machine detergent adhered to the inside of the screw and the extruder.

In Table 1, the case where the molding machine cleaner is particularly easy to peel off is rated as "◎", and the case where the molding machine cleaner is easily peeled off is rated as "○". The peeling requires a lot of time and trouble. The case was rated as "△", and the case where the sticking was obvious and could not be peeled off was rated as "X".

Claims (10)

A molding machine detergent comprising: a thermoplastic ultra high polymer (A), a thermoplastic resin (B), and a condensed hydroxy fatty acid and / or an alcohol ester (C) thereof. For example, the molding machine detergent of claim 1, wherein the thermoplastic ultra high polymer (A) is an ultra-high molecular weight polyethylene resin; the thermoplastic ultra high polymer (A) has an average molecular weight of 300,000 to 15 million. . For example, the molding machine detergent of claim 1 or 2, wherein the content ratio of the thermoplastic ultra polymer (A) is 10 parts by weight to 50 parts by weight based on 100 parts by weight of the resin in the molding machine detergent. Parts by weight. The molding machine cleaner according to any one of claims 1 to 3, wherein the thermoplastic resin (B) is a polyolefin-based resin. The molding machine cleaner according to any one of claims 1 to 4, wherein the content ratio of the condensed hydroxy fatty acid and its alcohol ester (C) is 100 parts by weight with respect to the resin in the molding machine cleaner, It is 0.1 to 30 parts by weight. The molding machine detergent according to any one of claims 1 to 5, wherein the condensation degree of the above-mentioned condensed hydroxy fatty acid is 2 or more. The molding machine detergent according to any one of claims 1 to 6, wherein the alcohol ester of the condensed hydroxy fatty acid is a condensed hydroxy fatty acid having a degree of condensation of 2 or more, and a reaction product with an alcohol. The molding machine detergent according to any one of claims 1 to 7, further containing an inorganic substance (D). The cleaning machine detergent according to claim 8, wherein the content ratio of the inorganic substance (D) is 10 to 100 parts by weight based on 100 parts by weight of the resin in the molding machine detergent. The cleaning machine detergent according to claim 8 or 9, wherein the inorganic substance (D) is at least one selected from the group consisting of a silicate compound, calcium carbonate, and glass fiber.