CA1336487C - Cleaning resin composition - Google Patents
Cleaning resin compositionInfo
- Publication number
- CA1336487C CA1336487C CA000593120A CA593120A CA1336487C CA 1336487 C CA1336487 C CA 1336487C CA 000593120 A CA000593120 A CA 000593120A CA 593120 A CA593120 A CA 593120A CA 1336487 C CA1336487 C CA 1336487C
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- resin
- cleaning
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
- C11D1/22—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aromatic compounds
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/37—Polymers
- C11D3/3746—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C11D3/3749—Polyolefins; Halogenated polyolefins; Natural or synthetic rubber; Polyarylolefins or halogenated polyarylolefins
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Detergent Compositions (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
A cleaning resin composition by the use of which it is possible to effect color exchange inside various molding machines by exchanging the composition for the preceding colored resin or to clean the inside of the machines or to effect resin exchange for the preceding resin inside the machines, in a small quantity of the composition, in a simple operation and in a short time is provided, which composition comprises a polyolefin resin such as polyethylene, polypropylene, etc. and a neutral salt of an alkylbenzenesulfonic acid, an inorganic filler and a water-repellent compound blended with the polyolefin resin.
Description
1 33~487 This invention relates to a cleaning resin composition used for cleaning the inside of various molding machines.
More particularly it relates to a cleaning resin composition obtained by blending a neutral salt of an alkylbenzenesulfonic acid, an inorganic filler and a water-repellent compound with a polyolefin resin.
~ ece~t molding of thermoplastic resins has been more and more diversified and production of more grades in smaller quantities has been intended. Further, due to appearance of engineering plastics, etc., color exchange or resin exchange inside molding machines has been carried out within a broad temperature region, and the frequency of the color exchange or resin exchange has also been increasing.
Heretofore, at the time of such color exchange or resin exchange, in order to remove contaminants caused by the pr~c~ing resin inside the molding machine i.e. in order to clean the inside of the molding machine, the following processes have been employed:
,~
v~._ '` ~ ' a process of drawing out the contaminated screw inside the molding machine, followed by scraping off the contaminants on the screw or the inner wall of the cylinder by means of a brush or the like i.e. the so-called hand sweeping, or a process of flowing a colorless resin (hereinafter abbreviated to cleaning resin) through the inside of the cylinder to clean the screw together with the cylinder (hereinafter referred to as co-cleaning) without drawing out the screw.
However, such processes require a long time for completely cleaning the screw and the inside of the cylinder, and in the case of the co-cleaning, a large quantity of cleaning resins is used to cause a large loss in the economical aspect.
Thus, in order to solve such problems, a cleaning agent composed mainly of a hard resin such as acrylic resins, a cleaning agent obtained by blending a nonionic surfactant with a thermoplastic resin, a cleaning agent obtained by blending a lubricant such as stearic acid with a thermoplastic resin, etc. have been developed.
However, in the former case, since the acrylic resins have high melt viscosity, a high load is applied at the time of cleaning the inside of the molding machine and also it is necessary to raise the temperature of the molding machine up to a considerably high temperature, there is a drawback that the resins are susceptible to thermal decomposition.
Further, there are drawbacks that operations are troublesome and require a considerably long time, for example, before the cleaning agent is used, the die screen pack, etc. of the molding machine should be removed, and further if the cleaning agent remains inside the molding machine after completion of the cleaning, the remaining cleaning agent mixes in the molded product of the succeeding resin so that the agent in the form of a foreign matter deteriorates the appear-ance or the physical properties of the molded product.
On the other hand, in the latter case, the cleaning agent obtained by blending stearic acid or the like with a thermoplastic resin is insufficient in the cleaning effect inside the molding machine, and in the case of the cleaning agent obtained by blending a nonionic surfactant with a thermoplastic resin, if the service temperature of the cleaning agent exceeds 250C, vigorous evolution of decomposition gas occurs and also a characteristic odor occurs to have a bad influence upon the operational environment, and further the cleaning effect is insufficient with such a cleaning agent.
The present inventors have made extensive research in order to obtain a cleaning resin composition by the use of which it is possible to effect color exchange inside various molding machines by exchanging the composition for the preceding colored resin or to clean the inside of the machines or to effect resin exchange for the preceding resin inside the machines, in a small quantity of the composition, in a simple operation and in a short time.
As a result we have found that a composition obtained by blending a neutral salt of an alkylbenzene-sulfonic acid, an inorganic filler and a water-repellent compound with a polyolefin resin is a cleaning resin composition capable of solving the above-mentioned problems and have achieved the present invention based on this finding.
In one aspect the present invention provides a cleaning resin composition comprising a polyolefin resin, a neutral salt of an alkylbenzenesulfonic acid, an inorganic filler selected from talc and calcium carbonate, and a water-repellant compound blended with said polyolefin resin,wherein the proportions of said neutral salt of an alkylbenzenesulfonic acid, said inorganic filler and said water-repellant compound are 1 to 20%, 1 to 30% and 0.5 to 10% each, respectively, by weight, based on the weight of said composition.
Preferably, the polyolefin resin is polyethylene or polypropylene. Suitably, the cleaning resin composition is in the form of pellets obtained by melt-kneading.
Examples of the polyolefin resin used in the present invention are polyethylene resins such as high density polyethylene, linear low density polyethylene, low density polyethylene, etc., polypropylene resins such as crystalline propylene homopolymer, crystalline propylene-ethylene copolymer, crystalline propylene-ethylene-butene-l terpolymer or crystalline propylene-butene-1 copolymer each containing 70% by weight or more of propylene component, polybutene-1, non-crystalline ethylene-propylene copolymer (EPR), non-crystalline ethylene-propylene-diene terpolymer (EPDM) and mixtures of the foregoing. Among these, preferred resins are high density polyethylene, linear low density polyethylene, crystalline propylene homopolymer, crystalline propylene-ethylene copolymer, crystalline propylene-ethylene-butene-1 terpolymer and mixtures of the foregoing.
As the neutral salt of an alkylbenzenesulfonic acid used in the present invention, sodium salt of an alkylbenzenesulfonic acid is preferably used. This sodium salt of an alkylbenzenesulfonic acid is one kind of anionic s surfactants and its decomposition-initiation temperature is as high as 300C. Examples of suitable alkyl groups for the neutral salt of an alkyl benzenesulfonic acid include linear or branched alkyl ~LO~S of C8 to C2Q.
Thus, the surfactant displays a powerful effect upon cl~ning of the inside molding machi~ec even within a high temperature region; thus a superior cleaning effect is exhibited over from a low temperature region to a high temperature region.
The guantity of the neutral salt of an alkylbenzenesulfonic acid blended is preferably 1 to 20% by weight, more preferably 5 to 15% by weight based on the weight of composition. If the quantity thereof blended is less than 1% by weight, the cleaning effect is small when the inside of molding machines is cleaned with the resulting composition, while if it exceeds 20% by weight, notable foaming occurs when the resulting composition is granulated.
Examples of the inorganic filler used in the present invention are calcium carbonate or talc.
~ .
., "~
,~ ,~" .
In the cleaning composition, the inorganic filler exerts a function of rubbing of L dirties in the molding machine and the preceding resin adhered thereonto through a mechanical force. The quantity thereof blended is preferably l to 30% by weight, more preferably 5 to 20%
by weight based on the weight of the composition. If the blended quantity is less than 1% by weight, the cleaning effect is insufficient, while if exceeds 30%
by weight, the melt-fluidity of the resulting cleaning resin composition is reduced and too a large load is applied onto the molding machine at the time of cleaning.
Examples of the water-repellent compound used in the present invention are synthetic waxes such as poly-ethylene wax, silicones, natural waxes, metal salts of higher fatty acids and mixtures of the foregoing. The quantity of the water-repellent compound blended is preferably 0.5 to 10% by weight, preferably 2 to 10~
by weight. In the cleaning resin composition of the present invention, the water-repellent compound exerts a lubricating function. If the quantity of the water-repellent compound blended is less than 0.5% by weight, the lubricating effect is small, while if it exceeds 10% by weight, the lubricating properties are so strong that the mechanical force of the coexistant inorganic filler inside the molding machine is reduced.
Phenolic antioxidants, thioic antioxidants, phosphorus antioxidants, etc. usually blend with poly-olefin resins may be blended.
The composition of the present invention may be obtained by introducing a polyolefin and definite quantities of a neutral salt of an alkylbenzenesulfonic acid, an inorganic filler and a water-repellent compound and further at least one member of the above-mentioned antioxidants into an agitating and mixing device such T~ ~r~ rk as Henschel mixer (tr~dcnamo), super mixer, etc. and agitating and mixing these materials for one to 5 minutes.
Further, the resulting mixture may be subjected to melt-kneading and extruding at a melt-kneading temperature of 180 to 220C, preferably 190 to 210C by means of a single screw extruder or a twin-screw extruder into pellet form.
The present invention will be described in more detail by way of Examples and Comparative examples, but it should not be construed to be limited thereto. In addition, the proportions therein refer to % by weight.
Examples 1 - 5 and Comparative examples 1 - 4 The respective blending components described in Table 1 mentioned later were introduced into a Henschel ~ r~de ~n.zrl~
mixer (tradcnamc), followed by agitating and mixing them for 3 minutes, melt-extruding the resulting g mixture at a melt-kneading temperature of 210C by means of an extruder having a bore diameter of 35 mm and provided with a vent and extruding the resulting material into pellet form to obtain a cleaning resin composition of the present invention. Further, in Comparative examples 1 - 4, the respective blending components described in Table 1 mentioned later were agitated and mixed and melt-kneaded in the same manner as in Examples 1 - 5 to obtain pellets. With the cleaning resin compositions obtained in these Examples and Comparative examples, 1) cleaning of an injection molding machine and 2) cleaning of a blow molding machine were carried out in a manner of thegist described below, respectively.
Table 1 Example Example Example Example Example Comp. Comp. Comp. Comp.
1 2 3 4 5 ex. 1 ex. 2 ex. 3 ex. 4 High density 60 0 68 5 75.0 - 35.0 - 76.0 polyethylene Linear low density _ _ _ _ 69.0% - 41.0 polyethylene Polypropylene 75.0% - - - - - - - 88.0 Na alkylbenzene- 1.5 - 7.5 - - 4.0 16.0 9 0 sulfonate K alkylbenzene- 7 5 14.5 _ 19.5 sulfonate Polyoxyethylene 5 0 cetyl ether Ca carbonate - 28.5 - 15.0 - 50.0 51.0 - - Y
Talc 15.0 - 8.5 - 1.5 - - - -Polyethylene wax 2.0 9.5 2.5 2.5 - - - 6.0 Zn stearate - 0.5 3.0 - 8.0 10.0 2.0 Na stearate 0.5 - 3.0 - 2.0 - 2.0 - -Silicon dioxide - - - - - - - 2.0 1.O C~
Ca stearate - - - - - - - - 2.0 Co ~: by weight 1) Example of cleaning of injection molding machine:
Black resin pellets of any of ABS resin, PPS resin and modified PPO resin, difficult in color exchange, were injection-molded by means of a 35 tons injection molding machine in 50 shots, followed by cleaning the inside of the molding machine with cleaning resin compositions obtained in Examples 1-5 and Comparative examples 1-4, each in 100 g, by injection molding and repeating injection molding with a colorless polypro-pylene resin as a cleaning resin by the injection moldingmachine until the resulting molded products were not colored, to obtain the total quantity of the cleaning resin required therefor.
Further, the black ABS resin was injection-molded under the same conditions and repeating injection-molding with the colorless polypropylene resin as a cleaning resin without using the above-mentioned cleaning resin compositions until the resulting molded product was not colored, to obtain the total quantity of the cleaning resin required therefor. These results are collectively shown in Table 2.
Table 2 Cleaning resin Quantity of cleaning Colored composition resin used resin Tempera- Case of use Case of non-Kind ture at of the com- use of the its use position composition Black of Ex. 4 320C600 (g) 3270 (g) modified that of " 2110 "
PPO resin Comp. ex. 1 1) that of " 2400 Comp. ex. 3 that of " 560 3120 Black Ex. 3 PPS resin that of .. 2050 "
that of .. 2250 Comp. ex. 3 that of 300C 100 910 Ex. 4 that of .. 580 Comp. ex. 1 Black that of " 600 ABS resin Comp. ex. 3 3) that of 120 Ex. 1 that of .. 620 Comp. ex. 2 that of " 590 "
Comp. ex. 4 that of 260OC 140 1230 that of .. 180 Ex. 3 that of .. 190 Black Ex. 2 ABS resin that of " 740 ..
Comp. ex. 1 that of .. 760 Comp. ex. 2 that of " 700 ..
Comp. ex. 3 Table 2 (continued) Cleaning resin Quantity of cleaning Colored composition resin used resin Tempera- Case of use Case of non-Kind ture at of the com- use of the its use position composition composition 230C 260 1410 that of " 300 "
Ex. 3 Black that of " 320 "
ABS resin Ex. 5 that of Comp. ex. 1 " 860 "
that of ~ 980 Comp. ex. 3 that of 230C 240 1305 that of ~ 220 Black Ex. 4 PP resin that of " 840 "
4) Comp. ex. 1 Comp. ex. 3 910 "
that of 200C 360 1820 Ex. 4 that of ~ 380 Black Ex. 1 _ ABS resin that of " 1000 "
Comp. ex. 2 Comp. ex. 3 1270 ..
1) Polyphenylene oxide 2) Polyphenylene sulfide 3) Acrylonitrile-butadiene-styrene copolymer 4 ) Polypropylene 2) Exmaple of cleaning of blow molding machine:
Black resin pellets of either one of ABS resin or polyethylene reisn difficult in color exchange were extruded in 10 parisons (one parison: ca. 200g) by means of a blow molding machine having a die diameter of 21 mm and a core diameter of 19 mm, followed by cleaning the resulting blow molding machine with the cleaning resin compositions obtained in Examples 1-5 and Comparative example 1-4, each in 2,000 g, and then molding the parisons with a colorless polyethylene resin as a cleaning resin until the weld line of the resulting parisons where color exchange was most difficult was not colored to obtain the total quantity of the cleaning resin required therefor.
Further, parisons were molded with the ABS resin under the same conditions, followed by molding the parisons with the colorless polyethylene resin as a cleaning resin without using the cleaning resin compositions until the weld line of the resulting parisons was not colored, to obtain the total quantity of the cleaning resin required therefor. These results are collectively shown in Table 3.
Table 3 Colored Cleaning resin Quantity of cleaning resin composition resin used Tempera- Case of use Case of non-Kind ture at of the com- use of the its use position composition of Ex. 3 260C 3.3 30-5 that of 1. 2 9 Black Ex. 4 ABS resin that of " 10 0 "
Comp. ex. 1 that of 11.8 Comp. ex. 3 that of 230C 5.8 60.0 that of ~ 6 5 Ex. 2 Black that of " 17 4 "
ABS resin Comp. ex. 1 Comp. ex. 2 18.0 "
that of ~ 23.0 Comp. ex. 3 that of 230C 5.7 57.5 that of " 5 5 ..
Ex. 4 Black that of " 17 7 "
HDPE resin Comp. ex. 2 1) that of 20.4 Comp. ex. 3 that of .. 22 8 Comp. ex. 4 Ex. 4 200C 7.0 70.5 that of ..
Black that of " 18 0 "
ABS resin Comp. ex. 1 that of .. 20.0 Comp. ex. 2 Comp. ex. 3 26.0 - 1) High density polyethylene According to the present invention, as seen from Tables 2 and 3, when the respective cleaning resin compositions shown in Examples 1-5 are used each in a small quantity, it is possible to far reduce the quantities of the cleaning resin used as compared with those shown in Comparative example 1-4.
and display a notably excellent cleaning effect.
The cleaning resin composition of the present invention has a notably excellent cleaning effect at the time of color exchange of the preceding colored resin in various molding machines and also at the time of cleaning for exchange of the preceding resin.
Namely, by using the cleaning resin composition of the present invention in a small quantity or by using the composition in a small quantity together with a cleaning resin, it is possible to far reduce the quantity of cleaning resins consumed and also notably shorten the cleaning period of time, as compared with the case where the inside of molding machines has so far been cleaned by exchange with cleaning resins each color exchange.
Such effect will be illustrated by cleaning of the inside of an injection molding machine. As seen from comparison of use of the cleaning resin composi-tion of the present invention with use of cleaning . - 17 - 1336487 resins alone, it is possible to reduce the quantity of the cleaning resins required down to about /5 ~ /10 and also to shorten the cleaning period of time down to about /5 ~ /10 Further, the cleaning resin composition of the present invention displays a notably excellent effect at the time of color exchange and also at the time of resin exchange even in the case where engineering plastics such as modified PPO resin, polyphenylene sulfide resin, etc. as the preceding resin are molded at high temperatures.
More particularly it relates to a cleaning resin composition obtained by blending a neutral salt of an alkylbenzenesulfonic acid, an inorganic filler and a water-repellent compound with a polyolefin resin.
~ ece~t molding of thermoplastic resins has been more and more diversified and production of more grades in smaller quantities has been intended. Further, due to appearance of engineering plastics, etc., color exchange or resin exchange inside molding machines has been carried out within a broad temperature region, and the frequency of the color exchange or resin exchange has also been increasing.
Heretofore, at the time of such color exchange or resin exchange, in order to remove contaminants caused by the pr~c~ing resin inside the molding machine i.e. in order to clean the inside of the molding machine, the following processes have been employed:
,~
v~._ '` ~ ' a process of drawing out the contaminated screw inside the molding machine, followed by scraping off the contaminants on the screw or the inner wall of the cylinder by means of a brush or the like i.e. the so-called hand sweeping, or a process of flowing a colorless resin (hereinafter abbreviated to cleaning resin) through the inside of the cylinder to clean the screw together with the cylinder (hereinafter referred to as co-cleaning) without drawing out the screw.
However, such processes require a long time for completely cleaning the screw and the inside of the cylinder, and in the case of the co-cleaning, a large quantity of cleaning resins is used to cause a large loss in the economical aspect.
Thus, in order to solve such problems, a cleaning agent composed mainly of a hard resin such as acrylic resins, a cleaning agent obtained by blending a nonionic surfactant with a thermoplastic resin, a cleaning agent obtained by blending a lubricant such as stearic acid with a thermoplastic resin, etc. have been developed.
However, in the former case, since the acrylic resins have high melt viscosity, a high load is applied at the time of cleaning the inside of the molding machine and also it is necessary to raise the temperature of the molding machine up to a considerably high temperature, there is a drawback that the resins are susceptible to thermal decomposition.
Further, there are drawbacks that operations are troublesome and require a considerably long time, for example, before the cleaning agent is used, the die screen pack, etc. of the molding machine should be removed, and further if the cleaning agent remains inside the molding machine after completion of the cleaning, the remaining cleaning agent mixes in the molded product of the succeeding resin so that the agent in the form of a foreign matter deteriorates the appear-ance or the physical properties of the molded product.
On the other hand, in the latter case, the cleaning agent obtained by blending stearic acid or the like with a thermoplastic resin is insufficient in the cleaning effect inside the molding machine, and in the case of the cleaning agent obtained by blending a nonionic surfactant with a thermoplastic resin, if the service temperature of the cleaning agent exceeds 250C, vigorous evolution of decomposition gas occurs and also a characteristic odor occurs to have a bad influence upon the operational environment, and further the cleaning effect is insufficient with such a cleaning agent.
The present inventors have made extensive research in order to obtain a cleaning resin composition by the use of which it is possible to effect color exchange inside various molding machines by exchanging the composition for the preceding colored resin or to clean the inside of the machines or to effect resin exchange for the preceding resin inside the machines, in a small quantity of the composition, in a simple operation and in a short time.
As a result we have found that a composition obtained by blending a neutral salt of an alkylbenzene-sulfonic acid, an inorganic filler and a water-repellent compound with a polyolefin resin is a cleaning resin composition capable of solving the above-mentioned problems and have achieved the present invention based on this finding.
In one aspect the present invention provides a cleaning resin composition comprising a polyolefin resin, a neutral salt of an alkylbenzenesulfonic acid, an inorganic filler selected from talc and calcium carbonate, and a water-repellant compound blended with said polyolefin resin,wherein the proportions of said neutral salt of an alkylbenzenesulfonic acid, said inorganic filler and said water-repellant compound are 1 to 20%, 1 to 30% and 0.5 to 10% each, respectively, by weight, based on the weight of said composition.
Preferably, the polyolefin resin is polyethylene or polypropylene. Suitably, the cleaning resin composition is in the form of pellets obtained by melt-kneading.
Examples of the polyolefin resin used in the present invention are polyethylene resins such as high density polyethylene, linear low density polyethylene, low density polyethylene, etc., polypropylene resins such as crystalline propylene homopolymer, crystalline propylene-ethylene copolymer, crystalline propylene-ethylene-butene-l terpolymer or crystalline propylene-butene-1 copolymer each containing 70% by weight or more of propylene component, polybutene-1, non-crystalline ethylene-propylene copolymer (EPR), non-crystalline ethylene-propylene-diene terpolymer (EPDM) and mixtures of the foregoing. Among these, preferred resins are high density polyethylene, linear low density polyethylene, crystalline propylene homopolymer, crystalline propylene-ethylene copolymer, crystalline propylene-ethylene-butene-1 terpolymer and mixtures of the foregoing.
As the neutral salt of an alkylbenzenesulfonic acid used in the present invention, sodium salt of an alkylbenzenesulfonic acid is preferably used. This sodium salt of an alkylbenzenesulfonic acid is one kind of anionic s surfactants and its decomposition-initiation temperature is as high as 300C. Examples of suitable alkyl groups for the neutral salt of an alkyl benzenesulfonic acid include linear or branched alkyl ~LO~S of C8 to C2Q.
Thus, the surfactant displays a powerful effect upon cl~ning of the inside molding machi~ec even within a high temperature region; thus a superior cleaning effect is exhibited over from a low temperature region to a high temperature region.
The guantity of the neutral salt of an alkylbenzenesulfonic acid blended is preferably 1 to 20% by weight, more preferably 5 to 15% by weight based on the weight of composition. If the quantity thereof blended is less than 1% by weight, the cleaning effect is small when the inside of molding machines is cleaned with the resulting composition, while if it exceeds 20% by weight, notable foaming occurs when the resulting composition is granulated.
Examples of the inorganic filler used in the present invention are calcium carbonate or talc.
~ .
., "~
,~ ,~" .
In the cleaning composition, the inorganic filler exerts a function of rubbing of L dirties in the molding machine and the preceding resin adhered thereonto through a mechanical force. The quantity thereof blended is preferably l to 30% by weight, more preferably 5 to 20%
by weight based on the weight of the composition. If the blended quantity is less than 1% by weight, the cleaning effect is insufficient, while if exceeds 30%
by weight, the melt-fluidity of the resulting cleaning resin composition is reduced and too a large load is applied onto the molding machine at the time of cleaning.
Examples of the water-repellent compound used in the present invention are synthetic waxes such as poly-ethylene wax, silicones, natural waxes, metal salts of higher fatty acids and mixtures of the foregoing. The quantity of the water-repellent compound blended is preferably 0.5 to 10% by weight, preferably 2 to 10~
by weight. In the cleaning resin composition of the present invention, the water-repellent compound exerts a lubricating function. If the quantity of the water-repellent compound blended is less than 0.5% by weight, the lubricating effect is small, while if it exceeds 10% by weight, the lubricating properties are so strong that the mechanical force of the coexistant inorganic filler inside the molding machine is reduced.
Phenolic antioxidants, thioic antioxidants, phosphorus antioxidants, etc. usually blend with poly-olefin resins may be blended.
The composition of the present invention may be obtained by introducing a polyolefin and definite quantities of a neutral salt of an alkylbenzenesulfonic acid, an inorganic filler and a water-repellent compound and further at least one member of the above-mentioned antioxidants into an agitating and mixing device such T~ ~r~ rk as Henschel mixer (tr~dcnamo), super mixer, etc. and agitating and mixing these materials for one to 5 minutes.
Further, the resulting mixture may be subjected to melt-kneading and extruding at a melt-kneading temperature of 180 to 220C, preferably 190 to 210C by means of a single screw extruder or a twin-screw extruder into pellet form.
The present invention will be described in more detail by way of Examples and Comparative examples, but it should not be construed to be limited thereto. In addition, the proportions therein refer to % by weight.
Examples 1 - 5 and Comparative examples 1 - 4 The respective blending components described in Table 1 mentioned later were introduced into a Henschel ~ r~de ~n.zrl~
mixer (tradcnamc), followed by agitating and mixing them for 3 minutes, melt-extruding the resulting g mixture at a melt-kneading temperature of 210C by means of an extruder having a bore diameter of 35 mm and provided with a vent and extruding the resulting material into pellet form to obtain a cleaning resin composition of the present invention. Further, in Comparative examples 1 - 4, the respective blending components described in Table 1 mentioned later were agitated and mixed and melt-kneaded in the same manner as in Examples 1 - 5 to obtain pellets. With the cleaning resin compositions obtained in these Examples and Comparative examples, 1) cleaning of an injection molding machine and 2) cleaning of a blow molding machine were carried out in a manner of thegist described below, respectively.
Table 1 Example Example Example Example Example Comp. Comp. Comp. Comp.
1 2 3 4 5 ex. 1 ex. 2 ex. 3 ex. 4 High density 60 0 68 5 75.0 - 35.0 - 76.0 polyethylene Linear low density _ _ _ _ 69.0% - 41.0 polyethylene Polypropylene 75.0% - - - - - - - 88.0 Na alkylbenzene- 1.5 - 7.5 - - 4.0 16.0 9 0 sulfonate K alkylbenzene- 7 5 14.5 _ 19.5 sulfonate Polyoxyethylene 5 0 cetyl ether Ca carbonate - 28.5 - 15.0 - 50.0 51.0 - - Y
Talc 15.0 - 8.5 - 1.5 - - - -Polyethylene wax 2.0 9.5 2.5 2.5 - - - 6.0 Zn stearate - 0.5 3.0 - 8.0 10.0 2.0 Na stearate 0.5 - 3.0 - 2.0 - 2.0 - -Silicon dioxide - - - - - - - 2.0 1.O C~
Ca stearate - - - - - - - - 2.0 Co ~: by weight 1) Example of cleaning of injection molding machine:
Black resin pellets of any of ABS resin, PPS resin and modified PPO resin, difficult in color exchange, were injection-molded by means of a 35 tons injection molding machine in 50 shots, followed by cleaning the inside of the molding machine with cleaning resin compositions obtained in Examples 1-5 and Comparative examples 1-4, each in 100 g, by injection molding and repeating injection molding with a colorless polypro-pylene resin as a cleaning resin by the injection moldingmachine until the resulting molded products were not colored, to obtain the total quantity of the cleaning resin required therefor.
Further, the black ABS resin was injection-molded under the same conditions and repeating injection-molding with the colorless polypropylene resin as a cleaning resin without using the above-mentioned cleaning resin compositions until the resulting molded product was not colored, to obtain the total quantity of the cleaning resin required therefor. These results are collectively shown in Table 2.
Table 2 Cleaning resin Quantity of cleaning Colored composition resin used resin Tempera- Case of use Case of non-Kind ture at of the com- use of the its use position composition Black of Ex. 4 320C600 (g) 3270 (g) modified that of " 2110 "
PPO resin Comp. ex. 1 1) that of " 2400 Comp. ex. 3 that of " 560 3120 Black Ex. 3 PPS resin that of .. 2050 "
that of .. 2250 Comp. ex. 3 that of 300C 100 910 Ex. 4 that of .. 580 Comp. ex. 1 Black that of " 600 ABS resin Comp. ex. 3 3) that of 120 Ex. 1 that of .. 620 Comp. ex. 2 that of " 590 "
Comp. ex. 4 that of 260OC 140 1230 that of .. 180 Ex. 3 that of .. 190 Black Ex. 2 ABS resin that of " 740 ..
Comp. ex. 1 that of .. 760 Comp. ex. 2 that of " 700 ..
Comp. ex. 3 Table 2 (continued) Cleaning resin Quantity of cleaning Colored composition resin used resin Tempera- Case of use Case of non-Kind ture at of the com- use of the its use position composition composition 230C 260 1410 that of " 300 "
Ex. 3 Black that of " 320 "
ABS resin Ex. 5 that of Comp. ex. 1 " 860 "
that of ~ 980 Comp. ex. 3 that of 230C 240 1305 that of ~ 220 Black Ex. 4 PP resin that of " 840 "
4) Comp. ex. 1 Comp. ex. 3 910 "
that of 200C 360 1820 Ex. 4 that of ~ 380 Black Ex. 1 _ ABS resin that of " 1000 "
Comp. ex. 2 Comp. ex. 3 1270 ..
1) Polyphenylene oxide 2) Polyphenylene sulfide 3) Acrylonitrile-butadiene-styrene copolymer 4 ) Polypropylene 2) Exmaple of cleaning of blow molding machine:
Black resin pellets of either one of ABS resin or polyethylene reisn difficult in color exchange were extruded in 10 parisons (one parison: ca. 200g) by means of a blow molding machine having a die diameter of 21 mm and a core diameter of 19 mm, followed by cleaning the resulting blow molding machine with the cleaning resin compositions obtained in Examples 1-5 and Comparative example 1-4, each in 2,000 g, and then molding the parisons with a colorless polyethylene resin as a cleaning resin until the weld line of the resulting parisons where color exchange was most difficult was not colored to obtain the total quantity of the cleaning resin required therefor.
Further, parisons were molded with the ABS resin under the same conditions, followed by molding the parisons with the colorless polyethylene resin as a cleaning resin without using the cleaning resin compositions until the weld line of the resulting parisons was not colored, to obtain the total quantity of the cleaning resin required therefor. These results are collectively shown in Table 3.
Table 3 Colored Cleaning resin Quantity of cleaning resin composition resin used Tempera- Case of use Case of non-Kind ture at of the com- use of the its use position composition of Ex. 3 260C 3.3 30-5 that of 1. 2 9 Black Ex. 4 ABS resin that of " 10 0 "
Comp. ex. 1 that of 11.8 Comp. ex. 3 that of 230C 5.8 60.0 that of ~ 6 5 Ex. 2 Black that of " 17 4 "
ABS resin Comp. ex. 1 Comp. ex. 2 18.0 "
that of ~ 23.0 Comp. ex. 3 that of 230C 5.7 57.5 that of " 5 5 ..
Ex. 4 Black that of " 17 7 "
HDPE resin Comp. ex. 2 1) that of 20.4 Comp. ex. 3 that of .. 22 8 Comp. ex. 4 Ex. 4 200C 7.0 70.5 that of ..
Black that of " 18 0 "
ABS resin Comp. ex. 1 that of .. 20.0 Comp. ex. 2 Comp. ex. 3 26.0 - 1) High density polyethylene According to the present invention, as seen from Tables 2 and 3, when the respective cleaning resin compositions shown in Examples 1-5 are used each in a small quantity, it is possible to far reduce the quantities of the cleaning resin used as compared with those shown in Comparative example 1-4.
and display a notably excellent cleaning effect.
The cleaning resin composition of the present invention has a notably excellent cleaning effect at the time of color exchange of the preceding colored resin in various molding machines and also at the time of cleaning for exchange of the preceding resin.
Namely, by using the cleaning resin composition of the present invention in a small quantity or by using the composition in a small quantity together with a cleaning resin, it is possible to far reduce the quantity of cleaning resins consumed and also notably shorten the cleaning period of time, as compared with the case where the inside of molding machines has so far been cleaned by exchange with cleaning resins each color exchange.
Such effect will be illustrated by cleaning of the inside of an injection molding machine. As seen from comparison of use of the cleaning resin composi-tion of the present invention with use of cleaning . - 17 - 1336487 resins alone, it is possible to reduce the quantity of the cleaning resins required down to about /5 ~ /10 and also to shorten the cleaning period of time down to about /5 ~ /10 Further, the cleaning resin composition of the present invention displays a notably excellent effect at the time of color exchange and also at the time of resin exchange even in the case where engineering plastics such as modified PPO resin, polyphenylene sulfide resin, etc. as the preceding resin are molded at high temperatures.
Claims (3)
1. A cleaning resin composition comprising a polyolefin resin, a neutral salt of an alkylbenzenesulfonic acid, an inorganic filler selected from talc and calcium carbonate, and a water-repellent compound blended with said polyolefin resin, wherein the proportions of said neutral salt of an alkylbenzenesulfonic acid, said inorganic filler and said water-repellant compound are 1 to 20%, 1 to 30% and 0.5 to 10% each, respectively, by weight, based on the weight of said composition.
2. A cleaning resin composition according to claim 1, wherein said polyolefin resin is polyethylene or poly-propylene.
3. A cleaning resin composition according to claim 1 or 2, which is in the form of pellets obtained by melt-kneading.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63058688A JPH01234445A (en) | 1988-03-12 | 1988-03-12 | Resin composition for cleaning |
| JP58688/1988 | 1988-03-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1336487C true CA1336487C (en) | 1995-08-01 |
Family
ID=13091488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000593120A Expired - Fee Related CA1336487C (en) | 1988-03-12 | 1989-03-08 | Cleaning resin composition |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0346956B1 (en) |
| JP (1) | JPH01234445A (en) |
| KR (1) | KR910005009B1 (en) |
| CN (1) | CN1040881C (en) |
| AU (1) | AU631115B2 (en) |
| CA (1) | CA1336487C (en) |
| DE (1) | DE68923037T2 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2016368A1 (en) * | 1989-05-22 | 1990-11-23 | Hiroshi Takasu | A cleaning resin composition |
| JPH0321653A (en) * | 1989-06-20 | 1991-01-30 | Chisso Corp | Resin composition for washing |
| JPH0768552B2 (en) * | 1989-12-12 | 1995-07-26 | チッソ株式会社 | Cleaning resin composition |
| JP2526167B2 (en) * | 1990-08-06 | 1996-08-21 | チッソ株式会社 | Method for processing detergent composition for rubber processing machine |
| GB2282607A (en) * | 1993-10-06 | 1995-04-12 | Itac Limited | Stripping compositions comprising sulphonic acid and thickener |
| DE10329122B4 (en) * | 2003-06-27 | 2006-07-13 | Franz Hartmann | Process for cleaning food-processing machines with perforated discs and cleaning mass for use |
| DE10334293A1 (en) * | 2003-07-25 | 2005-03-03 | Lieberum, Evelyne | Cleaning composition for plastics processing machinery comprises anionic and nonionic surfactants, water, a polymer and other additives |
| JP2006335913A (en) * | 2005-06-03 | 2006-12-14 | Daicel Polymer Ltd | Resin composition for cleaning |
| WO2008146822A1 (en) * | 2007-05-29 | 2008-12-04 | Asahi Kasei Chemicals Corporation | Purging agent and process for purging a resin molding machine with the same |
| JP5667754B2 (en) * | 2009-08-26 | 2015-02-12 | ダイセルポリマー株式会社 | Thermoplastic resin composition for cleaning |
| EP3235622B1 (en) * | 2014-12-17 | 2021-07-28 | Mitsubishi Chemical Corporation | Purging agent |
| CN104974870A (en) * | 2015-06-16 | 2015-10-14 | 郑州億润电缆材料有限公司 | Novel cleaning material for extruder screw and preparation method therefor |
| CN114480026B (en) * | 2020-10-23 | 2024-04-09 | 中国石油化工股份有限公司 | Screw cleaning agent with excellent performance and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2019422B (en) * | 1978-04-20 | 1982-07-14 | Gen Electric | Flame retardant crystalline polycarbonate compositions |
| JPH0624724B2 (en) * | 1986-02-20 | 1994-04-06 | チッソ株式会社 | Thermoplastic resin composition for cleaning melt-kneading device |
| KR940009003B1 (en) * | 1986-02-20 | 1994-09-28 | 짓소 가부시끼가이샤 | Themoplastic resin composition for cleaning |
| JPH0788520B2 (en) * | 1986-09-08 | 1995-09-27 | チッソ株式会社 | Thermoplastic resin composition |
-
1988
- 1988-03-12 JP JP63058688A patent/JPH01234445A/en active Pending
-
1989
- 1989-02-27 KR KR1019890002283A patent/KR910005009B1/en not_active IP Right Cessation
- 1989-03-08 CA CA000593120A patent/CA1336487C/en not_active Expired - Fee Related
- 1989-03-10 CN CN89101345A patent/CN1040881C/en not_active Expired - Fee Related
- 1989-03-10 AU AU31219/89A patent/AU631115B2/en not_active Ceased
- 1989-03-13 DE DE68923037T patent/DE68923037T2/en not_active Expired - Fee Related
- 1989-03-13 EP EP89201168A patent/EP0346956B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| AU631115B2 (en) | 1992-11-19 |
| CN1035834A (en) | 1989-09-27 |
| DE68923037T2 (en) | 1995-11-30 |
| KR890014721A (en) | 1989-10-25 |
| JPH01234445A (en) | 1989-09-19 |
| AU3121989A (en) | 1989-09-14 |
| CN1040881C (en) | 1998-11-25 |
| EP0346956B1 (en) | 1995-06-14 |
| DE68923037D1 (en) | 1995-07-20 |
| EP0346956A3 (en) | 1990-06-20 |
| EP0346956A2 (en) | 1989-12-20 |
| KR910005009B1 (en) | 1991-07-20 |
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| Date | Code | Title | Description |
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| MKLA | Lapsed |