TWI782202B - Resin composition for cleaning - Google Patents

Abstract

The present invention provides a cleaning resin composition which has excellent cleaning performance, is easy to replace with a back material resin, and is easy to handle. The present invention is a cleaning resin composition used for cleaning the inside of an extruder or molding machine for resin materials. The cleansing resin composition of the present invention contains a base resin and an additive, and the additive includes at least one of metal soap, fatty acid amide, and mineral oil (wherein, in the case of including the aforementioned fatty acid amide, fatty acid amide The content of amine is based on the total mass of the resin composition for cleaning, which is 1.0 mass % or more), and the base resin is a thermoplastic resin whose melt flow rate is 1.0 g/10 minutes or less (wherein the inorganic filler is relatively Except for the content of 3 parts by mass or more per 100 parts by mass of thermoplastic resin).

Description

resin composition for cleaning

The present invention relates to a cleaning resin composition for cleaning the inside of an extruder or molding machine for resin materials.

Various components such as resins or colorants that were previously kneaded or molded may remain inside the extruder or molding machine. If kneading of thermoplastic resin is carried out by using an extruder with various components remaining in it, the remaining components are likely to be mixed into the obtained kneaded product or molded product as impurities, resulting in abnormal physical properties or poor appearance. Possibility of other defects. Therefore, when changing the product to be manufactured, in order to remove the internal residues, the following countermeasures must be taken: disassemble the extruder and other devices for cleaning; replace with the base resin to be used next; net; etc.

However, when the device is disassembled for cleaning, there is a problem that it takes time for cleaning because the disassembly of the device is laborious. In addition, when replacing with the base resin to be used next, there is a problem that a large amount of base resin has to be used for sufficient replacement, and it takes time. Therefore, a method of cleaning the inside of the extruder etc. with a cleaning agent is generally used.

As a related conventional technology, a cleaning resin composition containing an inorganic filler having a physical scraping effect as a cleaning component has been developed. For example, cleaning resin compositions containing inorganic fillers such as glass fiber and zeolite have been proposed (Patent Documents 1 and 2).

Also, resin compositions for cleaning in which the types of resins and additives are adjusted have been developed. For example, a cleaning agent for molding machines containing two types of thermoplastic resins having different melt flow rates (MFR) and an inorganic foaming agent has been proposed (Patent Document 3). Furthermore, a cleaning resin composition containing a thermoplastic resin, a borate salt of a higher fatty acid monoglyceride, and a fatty acid amide has been proposed (Patent Document 4).

[Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. 2008-201975

[Patent Document 2] Japanese Patent Laid-Open No. 7-278359

[Patent Document 3] Japanese Patent Laid-Open No. 2005-231108

[Patent Document 4] Japanese Patent Laid-Open No. 9-216976

The resin compositions proposed in Patent Documents 1 and 2 have better detergency to a certain extent because they contain inorganic fillers having a scraping effect. However, there are problems that parts inside the device are easily worn and inorganic fillers are likely to remain as impurities. In addition, the cleaning agents or resin compositions proposed in Patent Documents 3 and 4 require a large amount of backwood resin in order to replace and remove the cleaning agents used for cleaning, and there is still room for improvement in cleaning performance. room.

The present invention is made in view of the above-mentioned problems in the prior art, and an object of the present invention is to provide a cleaning resin composition that is excellent in cleaning performance, easy to replace with a back material resin, and easy to handle.

The inventors of the present invention conducted intensive research in order to achieve the above-mentioned problems. As a result, they found that by preparing a thermoplastic resin having a melt flow rate of 1.0 g/10 minutes or less, and at least two of metal soap, fatty acid amide, and mineral oil A kind of additive can solve the above-mentioned problems, thereby completing the present invention.

That is, according to the present invention, a cleaning resin composition shown below is provided.

[1] A resin composition for cleaning, which is used to clean the inside of an extruder or molding machine for resin materials, the resin composition for cleaning contains a base resin and an additive, and the additive contains At least one of metal soap, fatty acid amide, and mineral oil (wherein, when the aforementioned fatty acid amide is included, the content of the aforementioned fatty acid amide is based on the total mass of the resin composition for cleaning, and is 1.0% by mass or more), the above-mentioned base resin is a thermoplastic resin with a melt flow rate of 1.0g/10min or less (except that the content of the inorganic filler is 3 parts by mass or more relative to 100 parts by mass of the above-mentioned thermoplastic resin).

[2] The cleaning resin composition according to [1] above, wherein the thermoplastic resin has a melt flow rate of 0.6 g/10 minutes or less.

[3] The cleaning resin composition according to [1] or [2] above, wherein the fatty acid amide has a melting point of 50 to 250°C.

[4] The cleaning resin composition according to any one of [1] to [3] above, wherein the content of the metal soap is 0.5 to 6.0 based on the total mass of the cleaning resin composition. quality%.

[5] The cleaning resin composition according to any one of [1] to [3] above, wherein the content of the metal soap is 1.5 to 5.0 based on the total mass of the cleaning resin composition quality%.

[6] The resin composition for cleaning according to any one of the above-mentioned [1] to [5], wherein the content of at least one of the fatty acid amide and the mineral oil is equal to that of the resin composition for cleaning. The total mass is based on 1.0 to 6.0% by mass.

[7] The cleaning resin composition according to any one of [1] to [5] above, wherein the content of at least any one of the fatty acid amide and the mineral oil is equal to that of the cleaning resin composition. The total mass is based on 1.5 to 5.0% by mass.

According to the present invention, it is possible to provide a cleaning resin composition that is excellent in cleaning performance, is easy to replace with a back material resin, and is easy to handle. If the resin composition for cleaning of the present invention is used, the time for cleaning the extruder and the molding machine can be shortened, and since the amount of resin used for the back material is also small, waste can be reduced . In addition, the cleaning resin composition of the present invention has a sufficient cleaning effect even when it is a composition that does not substantially contain an inorganic filler. Therefore, even if the resin composition for cleaning of the present invention is used as a composition substantially free of inorganic fillers, there will be no wear of parts inside the extruder and molding machine, and the inorganic fillers as impurities will not remaining inside the device.

Embodiments of the present invention will be described below, however, the present invention is not limited to the following embodiments. The cleaning resin composition of the present invention is a resin composition for cleaning the inside of an extruder or molding machine for resin materials, and it contains a base resin, and a resin composed of metal soap, fatty acid amide, and mineral oil. At least two additives selected by the constituting group. Also, the base resin is a thermoplastic resin having a melt flow rate of 1.0 g/10 minutes or less. Hereinafter, the details of the cleaning resin composition of the present invention will be described.

(base resin)

The base resin is a thermoplastic resin whose melt flow rate is 1.0 g/10 minutes or less. By using a thermoplastic resin with a melt flow rate of 1.0g/10min or less as the base resin, even when heated and melted, a certain degree of viscosity can be maintained, and the advantages of the inside of the extruder or molding machine can be utilized. of cleansing. In addition, the "melt flow rate (MFR)" of the resin in this specification is a physical property value measured based on the test method prescribed|regulated by ISO1133 (230 degreeC, 21.2N).

The thermoplastic resin used as the base resin has a melt flow rate of 1.0 g/10 minutes or less, preferably 0.6 g/10 minutes or less, further preferably 0.45 g/10 minutes or less, particularly preferably 0.18 g/10 minutes the following. Detergency can be further improved by using a thermoplastic resin having a melt flow rate of 0.6 g/10 minutes or less as the base resin. In addition, the lower limit of the melt flow rate of the thermoplastic resin is not particularly limited, and substantially 0.01 g/10 minutes or more is sufficient.

As the thermoplastic resin, thermoplastic resins generally used in various molding methods such as injection molding and extrusion molding can be used. Examples of thermoplastic resins include polyethylene-based resins, polypropylene-based resins, polystyrene-based resins, acrylic resins, polyolefin-based resins, acrylonitrile-butadiene-styrene copolymers (ABS resins), poly Amide resin, polycarbonate resin, etc. These resins may be used alone or in combination of two or more.

Examples of polyethylene-based resins include ethylene homopolymers, ethylene-propylene copolymers, ethylene-vinyl acetate copolymers, and the like. Examples of polypropylene-based resins include propylene homopolymers, propylene-butene copolymers, and the like. Examples of polystyrene-based resins include styrene homopolymers, acrylonitrile-styrene copolymers, styrene-butadiene copolymers, and the like. Examples of the acrylic resin include acrylate homopolymers, methyl methacrylate homopolymers, ethylene-ethyl acrylate copolymers, and the like. Examples of polyolefin-based resins include α-olefin homopolymers, ethylene-α-olefin copolymers, and the like.

(additive)

The additive contains at least two selected from the group consisting of metal soap, fatty acid amide and mineral oil. By compounding these additives in the base resin, it is possible to obtain a cleaning resin composition which is excellent in detergency even if it does not substantially contain an inorganic filler, and which can be easily replaced with a base resin. Furthermore, since sufficient detergency can be exhibited even if no inorganic filler is contained, the parts inside the device will not be worn out, and the inorganic filler will not remain inside the device, so it can be made into an easy-to-handle cleaning product. Resin composition.

The additive contains metal soap, and further contains at least any one of fatty acid amide and mineral oil, since the detergency is further improved, and it is easier to replace it with a material resin, so it is preferable.

[metallic soap]

Metallic soaps are generally metal salts of long chain fatty acids (except sodium and potassium salts). Examples of the metal salt include behenic acid metal salts, behenic acid metal salts, lauric acid metal salts, stearic acid metal salts, and palmitic acid metal salts. Examples of the metal constituting the metal salt include lithium, magnesium, zinc, aluminum, calcium, and the like. When cleaning the inside of an extruder or a molding machine, the resin composition for cleaning is usually moderately heated to bring it into a molten state. Therefore, it is preferable to use a metal soap that can be melted at the heating temperature (melting temperature) during washing.

The content of the metal soap is based on the total mass of the cleaning resin composition, preferably 0.5-6.0% by mass, more preferably 1.5-5.0% by mass. Detergency can be further improved by making content of metal soap into the said range.

[Fatty acid amides]

Examples of fatty acid amides include: lauric acid amide, palmitic acid amide, stearic acid amide, hydroxystearic acid amide, oleic acid amide, erucamide, N-stearyl stearic acid amide Amine, N-stearyl oleamide, N-oleyl stearamide, N-stearyl erucamide, hydroxymethyl stearamide, methylene bis stearamide , Ethyl bis-capric acid amide, Ethyl bis-lauric acid amide, Ethyl bis-stearyl amide, Ethyl bis-hydroxy stearic acid amide, Ethyl bis-behenyl amide , Hexamethylenebisstearamide, Hexamethylenebisbehenylamide, Hexamethylenebishydroxystearamide, N,N'-Distearyl Adipamide , Ethylene bis-oleic acid amide, hexamethylene bis-oleic acid amide, N,N'-dioleyl adipamide, etc. These fatty acid amides can be used alone or in combination of two or more.

As the fatty acid amide, it is preferable to use one that can be melted at the heating temperature (melting temperature) during washing. That is, it is preferable to use a fatty acid amide having a higher melting point as the heating temperature during washing is higher. Specifically, the melting point (mp) of fatty acid amide is preferably 50-250°C, more preferably 100-250°C, particularly preferably 130-250°C.

In the case where the additive contains fatty acid amide, the content of fatty acid amide is based on the total mass of the cleaning resin composition and is at least 1.0% by mass, preferably 1.0 to 6.0% by mass, and more preferably 1.5~5.0% by mass. In the case of using fatty acid amide as an additive, if the content of fatty acid amide is less than 1.0% by mass, the detergency is insufficient and more resin composition for cleaning needs to be used, and the time required for cleaning cannot be shortened. time. By making content of fatty acid amide into the said range, detergency improves and it becomes easy to replace with a back material resin.

[mineral oil]

As the mineral oil, any of paraffinic mineral oil and naphthenic mineral oil can be used. Examples of the paraffinic mineral oil include solid paraffin, liquid paraffin, and the like. Among them, paraffinic mineral oil is preferably used.

The content of the mineral oil is based on the total mass of the cleaning resin composition, preferably 1.0 to 6.0% by mass, more preferably 1.5 to 5.0% by mass. Detergency can be further improved by making content of mineral oil into the said range.

(other ingredients)

The cleaning resin composition may contain components other than the above-mentioned components as needed. As other components, an antioxidant, an inorganic filler, etc. are mentioned, for example.

Examples of antioxidants include phenolic antioxidants, phosphorus antioxidants, hindered phenolic antioxidants, and the like. Examples of the phenolic antioxidant include 3,5-di-tert-butyl-4-hydroxytoluene and the like. Examples of phosphorus antioxidants include triphenyl phosphite, trilauryl phosphite, trinonylphenyl phosphite, ginseng(2,4-di-tert-butylphenyl) phosphite, and the like. Examples of hindered phenolic antioxidants include tetrakis[methylene-3-(3′,5′-di-tert-butyl-4′-hydroxyphenyl)-propionate]methane and the like.

The inorganic filler can be contained within the range that does not cause wear of parts inside the device such as an extruder or a molding machine, and does not remain in the device as an impurity. Examples of the inorganic filler include silica, alumina, zeolite, glass fiber, natural minerals and the like.

<Manufacturing method of resin composition for cleaning>

The cleaning resin composition of the present invention can be produced by conventionally known methods. For example, it can be produced by mixing the aforementioned base resin and various additives using a stirring mixing device. As the stirring and mixing device, a general stirring and mixing device used when producing a resin composition or the like may be used. The resin composition obtained using an extruder can be melt-kneaded and extruded at an appropriate temperature to form pellets. As the extruder, a single-screw extruder, a twin-screw extruder, or the like can be used. A granular cleaning resin composition can be obtained by cutting in water or in air cutting the strands extruded from the extruder.

<Cleaning method inside the extruder or forming machine>

If the resin composition for cleaning of the present invention is used, the inside of devices such as extruders and molding machines for resin materials can be cleaned. In order to clean the inside of an extruder or other device, the resin composition for cleaning is put into the device and the device is operated almost as usual. In addition, at the time of washing|cleaning, the resin composition for washing|cleaning is heated normally, and it melts. The heating temperature is not particularly limited, and may be set in consideration of melting points and the like of various components contained in the cleaning resin composition. After cleaning with the cleaning resin composition, the inside of the device is replaced by circulating the resin as the base material of the cleaning resin. The replacement with the back material resin can be carried out under the same conditions as the cleaning with the cleaning resin composition.

[Example]

Hereinafter, although this invention is concretely demonstrated based on an Example, this invention is not limited to these Examples. In addition, "part" and "%" in an Example and a comparative example are mass standards unless otherwise specified.

<Preparation of resin composition for cleaning>

(Example 1)

)內，於200℃下熔融混練並擠出而獲得線料。利用造粒機切割所獲得之線料，而獲得淡黃褐色之顆粒狀之洗淨用樹脂組成物。 93.6 parts of polyethylene (MFR=0.14g/10min), 4.5 parts of zinc stearate (mp=125°C), 1.5 parts of ethylidene biscapric acid amide (mp=161°C), 0.2 parts of phenolic antioxidant 2 parts and 0.2 parts of phosphoric acid-based antioxidants were put into a mixer and stirred to obtain a mixture. The obtained mixture is put into a twin-screw extruder (screw diameter: 30mm

), melt kneading and extruding at 200°C to obtain strands. The obtained strands were cut with a granulator to obtain a light yellowish brown granular cleaning resin composition.

(Examples 2-10, Comparative Examples 1-3)

Except having used each component so that it may become the composition (unit: part) shown in Table 1, it carried out similarly to the said Example 1, and obtained the granular cleaning resin composition. Furthermore, for Comparative Example 1, a resin composition for cleaning was prepared using ingredients other than fatty acid amide (ethylendyl biscapric acid amide), and the amount of fatty acid amide shown in Table 1 was added during cleaning. (Ethylbidecanoic Amide).

<Cleaning inside the device>

(pollution step)

之單軸擠出機(L/D≒36)。於所準備之單軸擠出機中投入藍色母料80g及稀釋樹脂1920g(合計2kg)，於210℃下擠出而污染擠出機內部。再者，作為稀釋樹脂，使用與表2所記載之後材樹脂相同者。又，藍色母料係於上述稀釋樹脂(混合樹脂)中調配花青藍約3.5%及二甲基喹吖酮約1.4%而成者。 Prepare screw diameter 30mm

Single-screw extruder (L/D≒36). Put 80g of blue masterbatch and 1920g of diluted resin (2kg in total) into the prepared single-screw extruder, and extrude at 210°C to pollute the inside of the extruder. In addition, as the diluted resin, the same thing as the backwood resin described in Table 2 was used. Also, the blue masterbatch is prepared by blending about 3.5% of cyanine blue and about 1.4% of dimethylquinacridone into the above diluted resin (mixed resin).

(washing step)

Each prepared cleaning resin composition was put into a polluted extruder, and extruded under the temperature conditions shown in Table 2 (cleaning temperature (°C)) to obtain strands. The granules obtained by cutting the obtained strands with a granulator were visually confirmed, and the time required until the blue color was no longer recognized (cleaning time (minutes)), and the resin composition for cleaning were measured. Usage amount (kg). The results are shown in Table 2.

(back material replacement step)

After washing, the back material resins of the types shown in Table 2 were charged into the extruder, and extruded under the temperature conditions (replacement temperature (°C)) shown in Table 2 to obtain strands. The granules obtained by cutting the obtained strands with a granulator were visually confirmed, and the time until the light yellowish brown originating from the cleaning resin composition disappeared and became colorless and transparent was measured (replacement time ( Minutes)), and the amount of backwood resin used (kg). The results are shown in Table 2.

<Detergency evaluation>

The detergency of each detergency resin composition was comprehensively evaluated according to the evaluation criteria shown below. The results are shown in Table 2.

A: The washing time is within 6 minutes, and the replacement time is within 2 minutes.

B: The washing time is more than 6 minutes and less than 8 minutes, or the replacement time is more than 2 minutes and less than 4 minutes.

C: The washing time exceeds 8 minutes, and the replacement time exceeds 4 minutes.

(industrial availability)

The cleaning resin composition of the present invention is useful as a cleaning resin composition for cleaning the inside of an extruder or molding machine for resin materials.

Claims (5)

A resin composition for cleaning, which is used to clean the inside of an extruder or molding machine for resin materials. The resin composition for cleaning contains a base resin and additives. The additives include metal soap, and at least one of fatty acid amide and mineral oil (wherein, when the fatty acid amide is included, the content of the fatty acid amide is 1.0% by mass or more based on the total mass of the cleaning resin composition ), the above-mentioned base resin is a thermoplastic resin with a melt flow rate of 1.0 g/10 minutes or less (except that the content of the inorganic filler is more than 3 parts by mass relative to 100 parts by mass of the above-mentioned thermoplastic resin), and the above-mentioned metal soap The content is based on the total mass of the cleaning resin composition, which is 0.5~6.0% by mass. The content of at least one of the aforementioned fatty acid amide and the aforementioned mineral oil is based on the total mass of the cleaning resin composition. , 1.0 to 6.0% by mass, the aforementioned metal soap is at least one selected from the group consisting of behenic acid metal salt, behenic acid metal salt, lauric acid metal salt, stearic acid metal salt and palmitic acid metal salt , the aforementioned fatty acid amide is from lauric acid amide, palmitic acid amide, stearic acid amide, hydroxystearic acid amide, oleic acid amide, erucic acid amide, N-stearyl stearic acid amide , N-stearyl oleic acid amide, N-oleyl stearic acid amide, N-stearyl erucamide, hydroxymethyl stearic acid amide, methylene bis stearic acid amide, Ethyl bis-decanoic acid amide, ethyl bis-lauric acid amide, ethyl bis-stearamide, ethyl bis-hydroxystearamide, ethyl bis-behenyl amide, Hexamethylenebisstearamide, Hexamethylenebisbehenylamide, Hexamethylenebishydroxystearamide, N,N'-Distearyl Adipamide, Ethyl bis-oleyl amide, hexamethylene bis-oleyl amide and N,N'-dioleyl axyl diamide At least one selected from the group consisting of acid amides, and the aforementioned mineral oil is at least one selected from paraffinic mineral oil and naphthenic mineral oil. The cleaning resin composition according to claim 1, wherein the thermoplastic resin has a melt flow rate of 0.6 g/10 minutes or less. The cleaning resin composition according to claim 1 or 2, wherein the melting point of the fatty acid amide is 50-250°C. The cleaning resin composition according to claim 1 or 2, wherein the content of the metal soap is 1.5-5.0% by mass based on the total mass of the cleaning resin composition. The resin composition for cleaning according to claim 1 or 2, wherein the content of at least any one of the aforementioned fatty acid amide and the aforementioned mineral oil is based on the total mass of the resin composition for cleaning, and is 1.5 to 5.0 quality%.