JP2002121596A - Detergent for synthetic-resin-molding machine and cleaning method for synthetic-resin-molding machine using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an environmentally-benign detergent for a synthetic-resin- molding machine which detergent has a high cleaning effect, enables a complete recycle without any waste and does not need solidification such as pelletizing and the like and to provide a cleaning method for the inside of a synthetic-resin- molding machine using this detergent. SOLUTION: The detergent for a synthetic-resin-molding machine comprises a carboxylic acid amide compound and/or a carboxylic acid ester, especially a carboxylic acid amide compound of the general formula: (R1-CONH)m(R2) (wherein R1 is a 5-30C hydrocarbon group, R2 is hydrogen, a 1-30C hydrocarbon group or a group of the formula: (CH2)xNH(CO(CH2)yCONH(CH2)xNH)zCOR1, m is 1 or 2, x is an integer of 1-6, y is an integer of 1-8 and z is an integer). In the cleaning method for a molding machine, this detergent is used to remove a resin left in and adhered to the inside of a molding machine used for molding processes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detergent for a synthetic resin molding machine and a method for cleaning a synthetic resin molding machine using the same. More specifically, the present invention relates to a recyclable and zero waste environmental protection measure. A possible cleaning agent,
In injection molding machines, extrusion molding machines, blow molding machines, etc.
The present invention relates to an excellent cleaning agent which can be performed in a short time and in a small amount, and a method for cleaning a synthetic resin molding machine using the cleaning agent. Furthermore, the present invention provides an energy-saving cleaning agent that is required as a measure for preventing global warming and that does not require shaping such as pelletization.

[0002]

2. Description of the Related Art In a molding process of a synthetic resin using an injection molding machine, an extrusion molding machine, or the like, a resin used for the next molding is usually used in order to eliminate the influence of a preceding resin (previous material) when switching types. Cleaning has been performed. However, cleaning a molding machine by such a method takes a long time and not only requires a large amount of resin, but also can completely clean a complicated structural part in the molding machine. Without
There is a problem that the subsequent resin (post-material) is colored to lower transparency and quality. In molding synthetic resin, it is extremely important to reduce the amount of resin for cleaning and the cleaning time required for color change or material change from the viewpoint of maintaining or improving production efficiency. Therefore, in order to solve the above-mentioned problems, a resin composition in which a cleaning component is kneaded with a thermoplastic resin as a cleaning agent has been conventionally developed and used at the time of switching a molding material.

[0003] Such a detergent is required to have a high detergency with respect to the front material and a replaceability which can be easily replaced by the rear material. Therefore, a cleaning component obtained by kneading a cleaning component with a thermoplastic resin is required. -A method using a synthetic resin kneaded product has been proposed. For example, there is disclosed a detergent composition obtained by kneading a thermoplastic resin with a detergent component such as polyalkylene glycol and alkyl sulfide (US Pat. No. 5,397,498).

[0004] However, these cleaning agents are mainly composed of a synthetic resin, which not only complicates the manufacturing process but also does not provide a sufficient cleaning effect. Furthermore, the technology that has been developed so far cannot be used from the viewpoint of global environmental protection because it is not possible to control large-scale discharge of waste, which is the most important issue for environmental protection at present and in the future. It could not be used as a cleaning agent or a cleaning method. Under such circumstances, development of an environmentally friendly and waste-free cleaning agent has been indispensable.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for recycling waste without producing waste.
It is an object of the present invention to provide a detergent for a synthetic resin molding machine that is useful for environmental protection and can exhibit a remarkable cleaning effect, and a method for cleaning a synthetic resin molding machine using the same.

[0006]

The inventor of the present invention has made various studies to solve the above-mentioned problems.
In the cleaning of a synthetic resin molding machine, the cleaning agent of the present invention penetrates into the interface between the metal surface and the adhered resin contaminant, and the cleaning component combines with the metal to form a thin film on the boundary surface, thereby performing the cleaning and peeling action. As a result of focusing on the fact that a cleaning agent composed of a fatty acid amide compound that does not contain a base resin has a remarkable effect, the base resin that has been indispensable conventionally is unnecessary as a component of the cleaning agent. Recognition of the following point has led to the completion of the present invention based on these findings.

That is, the first aspect of the present invention relates to a detergent for a synthetic resin molding machine, which comprises a carboxylic acid amide compound.

The second aspect of the present invention relates to a detergent for a synthetic resin molding machine, which comprises a carboxylic acid ester compound.

Further, the third aspect of the present invention is a method for cleaning a synthetic resin molding machine for removing a synthetic resin adhered and remaining inside a synthetic resin molding machine used for molding a synthetic resin. A step of introducing a detergent comprising a carboxylic acid amide compound and / or a carboxylic acid ester compound into the inside of the synthetic resin molding machine to which the synthetic resin subjected to the processing adheres and remains; 2) heating the inside of the molding machine to produce the detergent After contacting with the inner wall surface of the molding machine, and 3) discharging the synthetic resin and the cleaning agent remaining in the molding process from the exit of the molding machine; and 4) discharging the cleaning agent. And draining the synthetic resin and the cleaning agent, and then introducing a post-material resin to be used in the next molding process.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The active ingredient of the first detergent for a synthetic resin molding machine of the present invention is a carboxylic acid amide compound. Specifically, the following general formula (I) (R ¹ -CONH) _m (R ² ) (I ) Having the chemical structure represented by

In the above general formula (I), R ¹ has 5 carbon atoms.
A 30 hydrocarbon group, R ² is a hydrocarbon group or a group represented by the formula of a hydrogen atom or a C1-30 _{(CH 2) x NH (CO} (CH 2) y CO
It is a group represented by NH (CH ₂ ) _x NH) _z COR ¹ . M is an integer of 1 or 2. Examples of the hydrocarbon group R ¹ include an alkyl group, an alkenyl group, a cycloalkyl group, a cycloalkenyl group, an aromatic group, and the like. Among them, an alkyl group and an alkenyl group are preferable, and particularly, a group having 8 carbon atoms.
Those having the above long chains are preferred. Specifically, an octyl group,
Nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, alkyl group such as eicosyl group, octenyl group, decenyl group, undecenyl group, dodecenyl And alkenyl groups such as tridecenyl group, tetradecenyl group, pentadecenyl group, hexadecenyl group, heptadecenyl group, octadecenyl group, nonadecenyl group and icosenyl group, and isomers or branched hydrocarbon groups thereof. Particularly, a dodecyl group, a tetradecyl group, a hexadecenyl group, an octadecyl group, a docosyl group, a 9-octadecenyl group, a 13-docosenyl group and the like are preferable.

In the above general formula (I), R ² is a hydrogen atom or a hydrocarbon group or a formula — (CH ₂ ) _x NH (CO (CH ₂ ) _y
CONH (CH ₂ ) _x NH) _z COR ¹ The hydrocarbon group is preferably an alkyl group, an alkylene group, an alkylol group, a phenyl group and the like, and examples of the alkylol group include lower alkylol groups such as a methylol group and an ethylol group. Further, a phenyl group to which an alkyl group is bonded may be used. The hydrocarbon group has 1 to 20 carbon atoms, and the hydrogen atom may be substituted with a hydroxyl group. For example, a methylol group of the formula -CH ₂ OH.

Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group,
Heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group,
Examples thereof include a pentadecyl group, a hexadecyl group, a heptadecyl group, an octadecyl group, a nonadecyl group, an eicosyl group and isomers thereof. Examples of the alkylene group include a methylene group, an ethylene group, and a propylene group.

In the above general formula (I), m is 1 or 2. Therefore, the detergent component of the present invention contains a primary amide or a secondary amide. In particular,
When m is 1, for example, monoamides, complex amides,
Methylolamides, and when m is 2, bisamides such as saturated aliphatic bisamides, unsaturated fatty acid bisamides, aromatic acid bisamides, etc., and polycondensates with alkylenediamines, higher fatty acids and polybasic acids (Hereinafter referred to as "polycondensate" if necessary).

The carboxylic acid amide compound suitable as the detergent of the present invention has high heat resistance and a decomposition onset temperature of about 200 ° C. or more, preferably about 250 ° C. or more. The melting point is about 70 ° C. or more,
Those having a temperature of 150 ° C. or higher are preferred.

Hereinafter, specific examples of the carboxylic acid amide compound will be described. Hereinafter, the names in parentheses indicate the aliases of the carboxylic acid amide compounds. I. Monoamides The monoamides are those in which R ^{2 in} formula (I) is a hydrogen atom, and preferred specific examples include saturated fatty acid monoamides and unsaturated fatty acid monoamides. Examples of the saturated fatty acid amide include dodecanoic acid amide (lauric acid amide) C ₁₁ H ₂₃ CONH ₂ , tridecanoic acid amide (tridecyl acid amide) C ₁₂ H ₂₅ CONH ₂ , tetradecanoic acid amide (myristic acid amide) C ₁₃ H ₂₇ CONH ₂ , pentadecanoic acid amide (pentadecylic acid amide) C ₁₄ H ₂₉ C
ONH ₂ , hexadecanoic acid amide (palmitic acid amide) C ₁₅ H ₃₁ CONH ₂ , heptadecanoic acid amide (margalic acid amide) C ₁₆ H ₃₃ CONH ₂ , octadecanoic acid amide (stearic acid amide) C ₁₇ H ₃₅ CONH ₂ , icosanoic acid Amide (arachidic acid amide) C ₁₉ H ₃₉ CONH ₂ , docosanoic acid amide (behenic acid amide) C ₂₁ H ₄₃ CONH ₂ and hydroxyoctadecanoic acid amide (hydroxystearic acid amide) C ₁₇ H ₃₄ (OH) CONH ₂ be able to.

These fatty acid amides can be used as the detergent of the present invention as a composition in which two or more kinds are mixed for adjusting physical properties and performance. Specific examples of unsaturated fatty acid amides include 9-octadecenoic amide (oleic amide) C ₁₇
H ₃₃ CONH ₂ , 13-docosenoic amide (erucic acid amide) C ₂₁ H ₄₁ CO
NH _{2 and the} like can be mentioned.

II. Compound amides Compound amides are represented by the general formula R ¹ CONHR ² wherein R ²
Is preferably an alkyl group or a methylol group. Specifically, N-octadecyloctadecanoic amide (N-
Stearyl stearic acid amide) C ₁₇ H ₃₃ CONHC ₁₈ H ₃₇ ,
N-octadecenyl 9-octadecene amide (N-oleyl oleate amide) C ₁₇ H ₃₃ CONHC ₁₈ H ₃₅ , N-octadecyl 9-octadecenoate amide (N-stearyl oleate amide) C ₁₇ H ₃₃ CONHC ₁₈ H ₃₇ , N-octadecenyloctadecanoic acid amide (N-oleyl stearic acid amide) C ₁₇ H ₃₅ CONHC ₁₈ H ₃₅ , N-octadecyl 1,
3-Docosenoic acid amide (N-stearyl erucic acid amide) C ₂₁ H ₄₁ CONHC ₁₈ H ₃₇ and N-octadecenyl hexadecanoic acid amide (N-oleyl palmitic acid amide) C ₁₅ H ₃₁ CONC ₁₈ H ₃₅ be able to.

III.Methylol amides Methylol amides have the formula, R¹-CONHCH_TwoAlso represented by OH
As a specific example, methylol octadecanoate
Myd (methylol stearic acid amide) C₁₇H ₃₅CONH
CH_TwoOH and methylol docosanoic acid amide (methylo
Rubehenic acid amide) C_{twenty one}H₄₃CONHCH _TwoName OH etc.
Can be.

IV.Bisamides Suitable bisamides include saturated fatty acid bisamides.
, Unsaturated fatty acid bisamide and aromatic bisamide
And the like. With the saturated fatty acid bisamide
Methylene bis octadecanoic acid amide (methylene bi
Stearic acid amide) (C₁₇H₃₅CONH)_Two(CH_Two), Etile
Ammonium bisdecanoic acid (ethylene biscapric acid flax
Id) (C₉H₁₉CONH)_Two((CH_Two)_Two), Ethylenebisdodecanoic acid
Amide (Ethylene bislaurate amide) (C₁₁H_{Two Three}C
ONH)_Two((CH_Two)_Two), Ethylenebisoctadecanoic acid amide
(Ethylene bisstearic acid amide) (C₁₇H₃₅CONH)
_Two((CH_Two)_Two), Ethylene bisisooctadecane san amy
(Ethylene bisstearic acid amide) (iC₁₇H₃₅CON
H)_Two((CH_Two)_Two), Ethylenebishydroxyoctadecanoic acid
Amide (Ethylene bishydroxystearic acid amide
Do [C₁₇H₃₄(OH) CONH]_Two((CH_Two)_Two), Ethylene bis docosan
Acid amide (ethylene bisbehenic acid amide) (C_{twenty one}H₄₃C
ONH)_Two((CH_Two)_Two), Hexamethylenebisoctadecanoate
Myde (hexamethylene bisstearic acid amide (C₁₇
H₃₅CONH)_Two((CH_Two)₆), Hexamethylenebisdocosanoic acid
Myd (ethylene bisbehenic acid amide) (C _{twenty one}H₄₃CONH)
_Two((CH_Two)₆), Hexamethylenebishydroxyoctadeca
Acid amide [C₁₇H₃₄(OH) CONH]_Two((CH_Two)₆), N, N'-
Bisoctadecyl adipic amide (N, N'-dis
Tearyladipate amide) (C₁₈H₃₇NHCO)_Two((CH_Two)_Four)
 And N, N'-bisoctadecylsebacate
(N, N'-distearylsebacic amide (C₁₈H
₃₇NHCO)_Two((CH_Two)₆) And the like.

Examples of the unsaturated fatty acid bisamide include ethylene bis 9-octadecenoic acid amide (ethylene bis oleic acid amide) (C ₁₇ H ₃₃ CONH) ₂ ((CH ₂ ) ₂ ),
Hexaethylene bis 9-octadecenoic acid amide (ethylene bis oleic acid amide) (C ₁₇ H ₃₃ (ONH) ₂ ((CH ₂ ) ₆ )
And N, N-dioctadecenyladipamide (N, N-dioleyladipamide (C ₁₈ H ₃₅ NHC
O ₂ ) ((CH ₂ ) ₄ ) and the like.

V. Aromatic bisamides As aromatic bisamides, m-xylenebisoctadecanoic acid amide (m-xylenebisstearic acid amide) [C ₁₇ H ₃₅ CONHCH ₂ ] ₂ (mC ₆ H ₄ ) and N, N-dioctadecyl isophthalic acid Amide (N, N-distearyl isophthalic amide) (C ₁₈ H ₃₇ NHCO) ₂ (C ₆ H ₄ ) can be exemplified.

VI. Polycondensate R ¹ CONH (CH ₂ ) _x NH (CO (CH ₂ ) _y CONH (CH ₂ ) _x NH) _z Alkylenediamine, higher fatty acid and polybasic acid represented by COR ¹ Can be mentioned. In the formula, R ¹ has 5 to 5 carbon atoms.
30, preferably 8 to 28 hydrocarbon groups. For example, an octyl group, a 2-ethylhexyl group, a nonyl group, a decyl group, a lauryl group, a myristyl group, a palmityl group, a stearyl group and the like can be exemplified. Also, x is 1 to
An integer of 6, y is an integer of 1 to 8, and z is an integer of 1 or 2.

The higher fatty acids used for preparing the compounds of the above formula include hexanoic acid, octanoic acid, 2-ethylhexanoic acid, nonanoic acid, decanoic acid, myristic laurate, palmitic acid, stearic acid, Behenic acid, montansan, oleic acid, erucic acid, 12-
Hydroxystearic acid and the like can be exemplified. Further, the polybasic acid is a carboxylic acid of a dibasic acid or more, and for example, a dicarboxylic acid such as adipic acid, azelaic acid, and sebacic acid can be used. The degree of polymerization of these polycondensates is preferably controlled so that the melting point thereof is 200 ° C. or higher, for example, 1 to 10, preferably 1 to 10.
~ 5. The polycondensate preferred as the detergent component of the present invention is more specifically a product obtained by polycondensing ethylenediamine, stearic acid and sebacic acid.

As the detergent of the present invention, any of the above-mentioned carboxylic acid amides is preferably used, but bisamides are preferred. Particularly, those having excellent heat resistance include the above-mentioned copolymers of ethylenediamine, stearic acid and dicarboxylic acid. Condensates are preferred. As commercially available products, for example, "Light Amide WH ^TM Series" manufactured by Kyoeisha Chemical Co., Ltd.,
For example, WH-215 and WH-255 can be obtained.

The active ingredient of the second synthetic resin molding detergent of the present invention is a carboxylate compound, specifically, a fatty acid monoester such as stearyl stearate, lauryl laurate, octyl bovine fatty acid. Esters, octyl stearate, octyl palmitate,
Monoesters such as isopropyl palmitate, behenyl behenate and octyl coconut fatty acid; polyhydric alcohol fatty acid esters such as dihydric alcohol fatty acid ester, sorbitan fatty acid ester and glycerin fatty acid ester (glyceride); and fatty acid ester oligomers. can be, also, heat resistance fatty acid ester having a Neopenkeru group in the molecule, for example, neopentyl polyol fatty acid esters, neopentyl polyol C ₉ fatty acid esters, pentaerythritol fatty acid esters,
Examples thereof include high melting point fatty acid esters such as dipentaerythritol fatty acid ester, tripentaerythritol fatty acid ester, and tetrapentaerythritol fatty acid ester. Examples of the fatty acid include linear or branched fatty acids having 10 to 20 carbon atoms, and may be either saturated or unsaturated.

As the cleaning agent of the present invention, a heat-resistant fatty acid ester is preferable, and a hindered alcohol, for example,
Fatty acid esters using neopentyl alcohol, pentaerythritol, trimethylolpropane and the like are suitable, and those having a melting point of 40 ° C. or more are preferred. Such a heat-resistant fatty acid ester is not limited, and may be arbitrarily selected from the group of “UNISTAR H Series” ^™ manufactured by NOF Corporation as a commercial product.

The cleaning agent of the present invention exhibits excellent functions and effects by using a carboxylic acid amide compound and / or a carboxylic acid ester alone without using a carrier, a diluent or the like. A sufficient cleaning effect can be obtained even when the cleaning agent of the present invention is diluted to about 1% by weight with a post-material resin. Specifically, the granular material of the carboxylic acid amide compound of the present invention, for example, a pellet can be diluted and used by being mixed with a pellet of a post-material resin to be subjected to the next molding process during washing. The content of the carboxylic acid amide compound pellet is 0.5% by weight based on the total amount of the post-material resin.
Although the content may be reduced to as low as 1% by weight or more, particularly 30% by weight or more, the cleaning time can be significantly reduced.

The mixture of the cleaning agent of the present invention and the post-material resin is
At the site of the washing operation, the mixture may be prepared by mixing with the post-material resin to be subjected to the next molding process. However, if the post-material resin can be specified, a mixture may be prepared in advance. As described above, by mixing and using the pellets of the detergent and the pellets of the post-material resin, the active ingredients can be easily and uniformly distributed in the molding machine.

The first and second cleaning agents of the present invention can be arbitrarily mixed, and can be mixed in a ratio of 100: 1 to 1:10.
It is preferable to mix at a ratio of 0. In particular, the ester can be used in an arbitrary ratio with respect to the carboxylic acid amide compound, but is preferably added up to 50% based on the total weight of the detergent. By using a detergent component in combination, a remarkable effect can be obtained in the cleaning action as shown in Examples described later. In addition, other detergents may be further blended as long as the detergent action is not inhibited. For example, a heat-resistant fatty acid ester is preferable,
Specific examples include higher fatty acid esters such as neopentyl polyol fatty acid ester, dipentaerythritol long-chain fatty acid ester, and polyhydric alcohol fatty acid ester.

The state of the detergent of the present invention may be a liquid or a solid, but the shape of the solid is not particularly limited, and may be a powder. And pellets of any shape such as spherical, cylindrical, and base stone shapes, and a wide range of pellets can be used. In particular, the granular material is easy to handle in operation. The size of the granular material such as pellets is not particularly limited and can be arbitrarily determined as desired, but is usually 0.5 mm to 10 mm, preferably 1 mm.
〜5 mm are useful.

The synthetic resin molding machine in which the cleaning agent of the present invention is used is not particularly limited, and may be of a type used for molding any synthetic resin. For example,
Extrusion molding machines, injection molding machines, blow molding machines and the like are covered.

The synthetic resin used for the molding process is as follows:
It is a thermoplastic resin, for example, polyethylene such as high-density polyethylene, low-density polyethylene, linear low-density polyethylene, polyolefins such as polypropylene, polybutene, polymethylpentene, polystyrene, ABS resin (acrylonitrile-butadiene-styrene resin) ,
Styrene resins such as AS resin (acrylotrile / styrene resin), MS resin (methyl methacrylate / styrene resin), MBS resin (methyl methacrylate / butadiene / styrene resin), polymethyl methacrylate (PMM)
A), acrylic resins such as polyacrylonitrile (PAN), vinyl resins such as polyvinyl chloride, polyvinyl acetate, polyvinylidene chloride, EPDM, EMMA (ethylene methyl methacrylate), polyamide (PA), polyacetal (POM) , Polycarbonate (PC), polyphenylene ether (PPE), polyphenylene sulfide (PPS), polyethylene terephthalate (PE)
TP), polybutylene terephthalate (PBTP), a fluorine-based resin, a silicon resin, an epoxy resin, a biodegradable polymer, and the like. Further, those synthetic resins containing pigments, paints and other colorants may be used.

Next, the method for cleaning a synthetic resin molding machine of the present invention comprises the following steps 1) to 3). That is, a method of cleaning a synthetic resin molding machine for removing a synthetic resin adhered and remaining inside a synthetic resin molding machine used for molding a synthetic resin. Introducing a detergent comprising a fatty acid amide compound into the interior of the synthetic resin molding machine, 2) heating the interior of the synthetic resin molding machine, passing the detergent into contact with the inner wall surface of the molding machine, and passing the detergent. ) A step of discharging the synthetic resin and the cleaning agent that have been subjected to the molding process remaining from the outlet of the molding machine; 4) discharging the synthetic resin and the cleaning agent in the step 3); The method includes a step of introducing a post-material resin to be subjected to molding. The synthetic resin molding machine and the synthetic resin used in the method for cleaning a synthetic resin molding machine of the present invention are as described above.

The amount of the detergent to be introduced into the molding machine in the step 1) is not particularly limited, and the properties and types of the synthetic resin subjected to the molding process, the type of the colorant,
It can be arbitrarily determined according to the residual amount inside the molding machine. The method of introducing the cleaning agent depends on the structure of the molding machine, but it is sufficient that the cleaning agent can be co-washed.

In step 2), the inside of the molding machine is heated after or before the introduction of the cleaning agent, and the remaining front material (preceding resin)
And at least one part of the cleaning agent is in a molten state. In such a molten state, the cleaning agent of the present invention penetrates into the interface between the metal and the adhered contaminant, and the cleaning component is preferentially bonded or adsorbed to the metal surface of the molding machine to form a thin film on the boundary surface, and the cleaning resin It is understood that the resin adhering to the metal wall surface in the molding machine is peeled off and removed by the washing and peeling action. The heating temperature is to make the above-mentioned interaction effective, and differs depending on the resin used, and may be arbitrarily determined,
In particular, 150 ° C. or higher is preferable. On the other hand, the conventional cleaning agent uses a base resin having compatibility with the adhered resin and performs the cleaning by removing the rake of the adhered resin, and the cleaning effect is inferior in that the base resin is indispensable, Discharges waste, and there are also difficulties in environmental conservation. The conditions for the passage of the cleaning agent in the molding machine in the step 2) may be the same as the conditions for the molding process.

In step 3), the remaining resin is taken out of the molding machine together with the detergent passed through the molding machine. The cleaning agent discharged from the molding machine can be recycled,
There are no cleaning agents that need to be discarded. The resin containing the cleaning agent of the present invention discharged from the step 3) does not need to be discarded because the carboxylic acid amide compound as a component of the cleaning agent of the present invention does not inhibit the quality of the resin. It can be added to a raw material of a resin to be subjected to the next molding process before use or stored. The amount of addition may be adjusted in consideration of the concentration of the detergent in the resin, the type and properties of the processed resin, and the like.

Next, further preferred embodiments of the present invention include the following. That is, (1) a fatty acid amide compound having a chemical structure of R ¹ CONH (CH ₂ ) _x NH (CO (CH ₂ ) _y CONH (CH ₂ ) _x NH) _z COR ¹ and having a melting point of 150 ° C. or more. Cleaning agent for thermoplastic resin molding machines. (2) A detergent made of a fatty acid amide compound having a melting point of 150 ° C. or more is introduced into a molding machine to which a thermoplastic resin adheres and remains after extrusion molding, and the inside of the molding machine is heated to 80 ° C. to 350 ° C.
, And a method of cleaning a synthetic resin molding machine, which comprises passing the cleaning agent together with the residual resin and discharging the same.

[0039]

The present invention will be specifically described below with reference to examples and comparative examples. However, the present invention is not limited by the examples and the like. The synthetic resins and detergents used in the examples and comparative examples are shown below. The method for evaluating the cleaning effect and the like is as follows.

Resin used: PP Sumitomo Chemical Co., Ltd. Polypropylene "Sumitomo Nofren H501" ^TM PP (transparent plate) Sumitomo Chemical Co., Ltd. Polypropylene "Sumitomo Nophrene WP834A" ^TM ABS Acrylonitrile Petrazine, manufactured by Mitsubishi Chemical Corporation. -Styrene resin (ABS) "TAFLEX TFX-420" ^TM ABS (Transparent plate) Acrylonitrile-phthalic acid-styrene resin (ABS) "JSRABS59" ^TM manufactured by Nippon Gosei Co., Ltd.

Detergent: Detergent A1 PP (transparent grade) pellets were mixed with 1.0% by weight of carboxylic acid amide pellets (trade name: Light Amide 255 Kyoeisha Chemical Co., Ltd.) (the same applies hereinafter) and mixed and dispersed. Washing soap. -Detergent A2 A detergent obtained by adding 30% by weight of carboxylic acid amide pellets to PP (transparent grade) pellets and mixing and dispersing them. -Detergent A3 Detergent using only carboxylic acid amide pellets. Detergent B1 A detergent obtained by adding 5.0% by weight of carboxylic acid amide pellets to ABS (transparent grade) pellets and mixing and dispersing them. Detergent B2 A detergent obtained by adding 45% by weight of carboxylic acid amide pellets and 5.0% by weight of polyhydric alcohol fatty acid ester (trade name: LOX10L: VPG861 Henkel Japan) to ABS (transparent grade) pellets.・ Cleaner C Polypropylene homopolymer (MRF: 0.5 g / 10
Min.) 91.6% by weight, a mixed molded product of stearic acid monoglyceride borate calcium salt 8.0% by weight, and light amide WH-255 ^™ 0.4% by weight were taken in a Henschel mixer and stirred at 500 rpm for 3 minutes. Mixed. The obtained mixture is twin-screw extruder (cylinder diameter:
30 mm, L / D: 30) and cylinder temperature 1
The mixture was melt-kneaded and extruded at 90 ° C. to 200 ° C. and a die temperature of 200 ° C., cooled, and cut with a pelletizer to obtain a detergent C. A cleaning agent obtained by adding 2.0% by weight of a polyhydric alcohol fatty acid ester (trade name: Loxiol VPG861 Cognis Japan KK) (the same applies hereinafter) to the cleaning agent D1 PP (transparent grade) and mixing the cleaning agent D2 PP ( A detergent obtained by adding 40.0% by weight of a polyhydric alcohol fatty acid ester to (transparent grade) and mixing glyceride (trade name: Lo with detergent E1 ABS (transparent grade))
xiol G129 Cognis Japan K.K. -Detergent E2 A detergent obtained by adding 70.0% by weight of glyceride to ABS (transparent grade) and mixing. -Detergent F Polypropylene homo powder (MFR: 0.5 g / 10
Min) A mixture of 91.5% by weight and 8.5% by weight of a polyhydric alcohol fatty acid ester was taken in a Henschel mixer, and stirred and mixed at a rotation speed of 500 rpm for 3 minutes. The obtained mixture is twin-screw extruder (cylinder diameter: 30 mm, L / D: 3).
0), melt-kneaded and extruded at a cylinder temperature of 190 ° C. to 200 ° C. and a die temperature of 200 ° C., cooled, and cut with a pelletizer to obtain a detergent F. -Detergent G A detergent using only polyhydric alcohol fatty acid ester (powder).

Cleaning effect: After the molding operation of the front material (black coloring material containing 1.8% of carbon black) was completed using an injection molding machine with a mold clamping force of 100 tons, the entire amount of resin in the cylinder was discharged. Washing was performed by a measurement-injection operation, and the used amount and time (converted from the amount of one shot) of the cleaning agent at that time were determined and defined as cleaning properties. The cleaning agent was replaced and discharged by the post-material, and it was confirmed that there was no influence (black stains) on the post-material molded product. The cleaning effect was the sum of the cleaning performance and the discharge performance.

Example 1 After completion of the molding operation of the front material (5 kg of the PP resin black coloring material), the entire amount of the resin in the cylinder was discharged, and the cleaning agent A1 was used.
And washing was performed at 230 ° C. by the operation of weighing and injecting, and it took 2.5 minutes to clean using 400 g of the cleaning agent until it was confirmed that the black color of the front material had disappeared (cleanability). ). Next, in order to replace and discharge the cleaning agent A1, measurement-injection is repeated, and the transparent PP resin (transparent grade) is used.
As a result of measuring the use amount, 0.6 g was required using 100 g (dischargeability). 500 g was used as a washing effect, and the required time was 3.1 minutes.

Example 2 After completion of the molding operation of the preform (5 kg of a black coloring material of PP resin), the entire amount of the resin in the cylinder was discharged, and the cleaning agent A2
Was washed at 230 ° C. by a weighing-injection operation, and it took 1.0 minute to clean using 150 g of a cleaning agent until it was confirmed that the black color of the front material had disappeared (cleanability). ). Next, in order to replace and discharge the cleaning agent A2, measurement and injection were repeated, and the amount of the transparent PP resin used was measured. 290 g was used as a cleaning effect, and the required time was 1.
It took 8 minutes.

Example 3 After completion of the molding operation of the preceding material (5 kg of a black coloring material of PP resin), the entire amount of the resin in the cylinder was discharged, and the cleaning agent A3
Was washed at 230 ° C. by a weighing-injection operation, and it took 0.1 minute to clean using 10 g of a cleaning agent until disappearance of the black material was confirmed (cleanability). Next, in order to replace and discharge the cleaning agent A3, measurement-injection was repeated, and the amount of the transparent PP resin used was measured.
It took 1.1 minutes using 0 g (dischargeability). 190 g was used as a washing effect, and the required time was 1.2 minutes.

Example 4 After completion of the molding operation of the previous material (5 kg of the ABS resin black coloring material), the entire amount of the resin in the cylinder was discharged, and the cleaning agent B
Was charged at 220 ° C., and washing was carried out at 220 ° C. by a measurement-injection operation. As a result, it took 2.2 minutes to wash using 350 g of a washing agent until the disappearance of the black material was confirmed (cleanability). Next, in order to replace and discharge the cleaning agent B1, the metering-injection was repeated, and the amount of the transparent ABS resin used was measured. As a result, 0.7 g was required using 120 g (dischargeability).
470 g was used as a washing effect, and the required time was 2.9 minutes.

Example 5 After the molding operation of the previous material (5 kg of the ABS resin black coloring material) was completed, the entire amount of the resin in the cylinder was discharged, and the cleaning agent B was used.
2, and washing was performed at 220 ° C. by a measurement-injection operation. As a result, it took 0.6 minute to wash using 100 g of the detergent until the disappearance of the black color of the front material was confirmed (detergency). Next, in order to replace and discharge the cleaning agent B2, measurement and injection were repeated, and the amount of the transparent ABS resin used was measured. As a result, it took 150 minutes to use 150 g (dischargeability).
250 g was used as a washing effect, and the required time was 1.6 minutes.

Example 6 After completion of the molding operation of the preform (5 kg of the PP resin black coloring material), the entire amount of the resin in the cylinder was discharged, and the cleaning agent D1 was used.
Was added, and washing was performed at 230 ° C. by a measurement-injection operation. As a result, it took 2.6 minutes to wash using 420 g of the detergent until the disappearance of the black color of the front material was confirmed (cleanability).
Next, in order to replace and discharge the cleaning agent D1, measurement-injection was repeated, and the amount of the transparent PP resin was measured.
It took 0.6 minutes using 00 g (dischargeability). 520 g was used as a washing effect, and the required time was 3.2 minutes.

Example 7 After completion of the molding operation of the preform (5 kg of the black coloring material of PP resin), the entire amount of the resin in the cylinder was discharged, and the cleaning agent D2
Was charged and washed at 230 ° C. by the operation of weighing-injection. As a result, it took 1.1 minutes to clean using 170 g of the detergent until the disappearance of the black color of the front material was confirmed (cleanability).
Next, in order to replace and discharge the cleaning agent D2, measurement and injection were repeated, and the amount of the transparent PP resin was measured.
It took 1.0 minute using 50 g (dischargeability). 320 g was used as a washing effect, and the required time was 2.1 minutes.

Example 8 After the molding operation of the front material (5 kg of the ABS resin black coloring material) was completed, the entire amount of the resin in the cylinder was discharged, and the detergent E
1 was added, and washing was performed by a measurement-injection operation at 220 ° C. As a result, it took 2.1 minutes to wash using 340 g of the detergent until the disappearance of the black color of the front material was confirmed (cleanability). Next, in order to replace and discharge the cleaning agent E1, the metering-injection was repeated, and the amount of the transparent ABS resin used was measured. As a result, 0.6 g was required using 100 g (dischargeability).
440 g was used as a washing effect, and the required time was 2.7 minutes.

Example 9 After completing the molding operation of the preform (5 kg of the ABS resin black coloring material), the entire amount of the resin in the cylinder was discharged, and the detergent E
2, and washing was performed by a measurement-injection operation at 220 ° C., and it took 0.7 minute to wash using 110 g of the detergent until the disappearance of the black color of the front material was confirmed (cleanability). Next, in order to replace and discharge the cleaning agent E2, measurement and injection were repeated, and the amount of the transparent ABS resin used was measured. As a result, it took 1.0 minute to use 150 g (dischargeability).
260 g was used as a cleaning effect, and the required time was 1.7 minutes.

Example 10 After completing the molding operation of the preform (5 kg of the ABS resin black coloring material), the entire amount of the resin in the cylinder was discharged, and the detergent G
And washing was performed at 220 ° C. by a weighing-injection operation. As a result, it took 0.1 minute to clean using 10 g of the cleaning agent until the disappearance of the black color of the front material was confirmed (cleanability). Next, in order to replace and discharge the cleaning agent G, the metering-injection was repeated, and the amount of the transparent ABS resin used was measured.
It took 1.2 minutes using 0 g (dischargeability). 200 g was used as the cleaning effect, and the required time was 1.3 minutes.

COMPARATIVE EXAMPLE 1 After completion of the molding operation of the preform (5 kg of the black colored material of PP resin), the entire amount of the resin in the cylinder was discharged, the cleaning agent C was charged, and washing was performed at 230 ° C. by the measurement-injection operation. Was carried out until the disappearance of the black color of the previous material was confirmed.
It took 6.4 minutes for washing using 30 g (washability). Next, measurement-injection was repeated to replace and discharge the cleaning agent C, and the amount of the transparent PP resin used was measured.
g required 3.7 minutes for washing (dischargeability). It used 1620 g as a washing effect and required 10.1 minutes.

COMPARATIVE EXAMPLE 2 After the molding operation of the previous material (5 kg of the ABS resin black coloring material) was completed, the entire amount of the resin in the cylinder was discharged, and the cleaning agent C was removed.
Was washed at 220 ° C. by a measurement-injection operation.
It took 7.8 minutes to wash using 250 g (washability). Next, measurement and injection were repeated to replace and discharge the cleaning agent C, and the amount of the transparent ABS resin used was measured.
It took 4.2 minutes to wash using 0 g (dischargeability). 1920 g was used as the cleaning effect, and the required time was 12.0 minutes.

Comparative Example 3 After completing the molding operation of the preform (5 kg of a black colored material of PP resin), the entire amount of the resin in the cylinder was discharged, the cleaning agent F was charged, and washing was performed at 230 ° C. by the measurement-injection operation. Was carried out until the disappearance of the black color of the previous material was confirmed.
It took 6.6 minutes to wash using 50 g (washability). Next, metering-injection was repeated to replace and discharge the cleaning agent F, and the amount of the transparent PP resin used was measured.
g took 3.8 minutes to clean (discharge). 1660 g was used as a washing effect, and the required time was 10.4 minutes.

[0056]

[Table 1]

When comparing the above Examples and Comparative Examples, when the cleaning agent of the present invention was used as shown in Examples 1 to 10,
It is understood that both the cleaning property and the discharge property are excellent, and the cleaning can be completed in a short time with a small amount of the cleaning agent.

[0058]

The cleaning agent of the present invention has the above-mentioned constitution, and is not formed by kneading with a conventional synthetic resin. The cleaning of the molding machine can be completed, and the cleaning effect has a long lasting effect. Further, since the cleaning agent of the present invention can be recycled and does not need to be removed even if mixed into the molding resin, the "dischargeability" in the cleaning effect, that is, "substitution" is not particularly required. . One of the effects is that the type of the resin to be washed is not selected, and the mixture of the cleaning agent of the present invention with the post-material resin is crushed without being discarded to be a raw material of the post-material resin. Since it can be used by adding it arbitrarily, it can be recycled and is extremely useful for environmental protection of zero waste.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C11D 17/06 C11D 17/06

Claims (14)

[Claims] 1. A cleaning agent for a synthetic resin molding machine, comprising a carboxylic acid amide compound. 2. The carboxylic acid amide compound is represented by the following general formula (I) (R ¹ -CONH) _m (R ² ) (I) wherein R ¹ is a hydrocarbon group having 5 to 30 carbon atoms. Yes, R
² is a hydrocarbon group having 1 to 30 carbon atoms which may contain a hydrogen atom or a hydroxyl group or a formula-(CH ₂ ) _x NH (CO (CH ₂ ) _y
CONH (CH ₂ ) _x NH) _z is a group represented by COR ¹ , m is an integer of 1 or 2, x is an integer of 1 to 6, y is an integer of 1 to 8, z is 1 or 2 Is an integer. The detergent for a synthetic resin molding machine according to claim 1, which is a compound represented by the formula: 3. The carboxylic acid amide compound is selected from the group consisting of fatty acid monoamides, fatty acid bisamides, complex fatty acid monoamides, aromatic acid monoamides, aromatic acid bisamides and polycondensates of alkylene diamines, higher fatty acids and polybasic acids. The cleaning agent for a synthetic resin molding machine according to claim 1, which is at least one selected from the group consisting of: 4. The detergent for a synthetic resin molding machine according to claim 3, wherein the carboxylic acid amide compound is a polycondensate of an alkylenediamine, a higher fatty acid and a dicarboxylic acid. 5. The detergent for a synthetic resin molding machine according to claim 1, wherein the carboxylic acid amide compound has a melting point of 150 ° C. or higher. 6. A detergent for a synthetic resin molding machine, comprising a carboxylic acid ester compound. 7. The detergent for a synthetic resin molding machine according to claim 6, wherein the carboxylic acid ester compound is a fatty acid ester. 8. The detergent for a synthetic resin molding machine according to claim 7, wherein the fatty acid ester is a polyhydric alcohol fatty acid ester. 9. The cleaning agent for a synthetic resin molding machine according to claim 6, wherein the carboxylic acid ester compound has a melting point of 40 ° C. or higher. 10. The cleaning agent for a synthetic resin molding machine according to claim 1, wherein the carboxylic acid amide compound or the carboxylic acid ester compound is in the form of a powder or granules. 11. The synthetic resin molding machine according to claim 1, wherein the cleaning agent is a mixture of the carboxylic acid amide compound granules and the carboxylate compound granules with a post-resin resin granule. Washing soap. 12. A method of cleaning a synthetic resin molding machine for removing a synthetic resin adhered and remaining inside a synthetic resin molding machine used for molding a synthetic resin, wherein: 1) the synthetic resin subjected to the molding process is used; A step of introducing a cleaning agent comprising the carboxylic acid amide compound or the carboxylic acid ester compound or a mixture thereof according to claim 1 or 6 into the inside of the synthetic resin molding machine having the adhesion residue, 2) heating the inside of the molding machine, Contacting the cleaning agent with the inner wall surface of the molding machine and then passing the cleaning agent through the molding machine; 3) discharging the synthetic resin that has been subjected to the molding process and the cleaning agent remaining from the molding machine outlet; 3) A method of cleaning a synthetic resin molding machine, comprising the step of discharging the synthetic resin and the cleaning agent in 3) and then introducing a post-material resin to be subjected to the next molding process. 13. The method for cleaning a synthetic resin molding machine according to claim 12, wherein the heating temperature is 80 ° C. or higher. 14. The cleaning agent according to claim 1, wherein the cleaning agent is a mixture of a granular material of the carboxylic acid amide compound and / or the carboxylic acid ester compound and a granular material of a post-material resin.
3. The method for cleaning a synthetic resin molding machine according to item 2.