CN111712364A

CN111712364A - Screw extraction aid

Info

Publication number: CN111712364A
Application number: CN201980013414.9A
Authority: CN
Inventors: 野边洋平; 小林永子; 渡边琢
Original assignee: Asahi Kasei Corp
Current assignee: Asahi Kasei Corp; Asahi Chemical Industry Co Ltd
Priority date: 2018-02-28
Filing date: 2019-02-22
Publication date: 2020-09-25
Also published as: WO2019167829A1; TWI700170B; JP7175958B2; TW201938346A; JPWO2019167829A1

Abstract

The present invention provides an auxiliary agent for screw extraction for a resin processing machine, characterized in that the auxiliary agent contains a resin composition containing: a lubricant (A) having a surface tension of 32mN/m or less and a melting point or softening temperature of 70 ℃ or higher; and a thermoplastic resin (B) having a surface tension greater than that of the component (A) by 5mN/m or more, wherein the surface tension of the auxiliary agent after heating at 80 ℃ for 16 hours is 32mN/m or less.

Description

Screw extraction aid

Technical Field

The present invention relates to a screw extraction auxiliary for a resin processing machine.

Background

Generally, resin processing machines such as an extrusion molding machine and an injection molding machine are used for coloring, mixing, molding, and the like of resins. In these devices, at the end of a predetermined operation, there is a possibility that additives such as a dye and a pigment contained in the resin itself or the molding material, and deteriorated products such as a char formed from the resin or the like remain in the molding machine. These residues are mixed into the molded article during the subsequent resin molding, and may cause a defective appearance of the product. In particular, the incorporation of fine burned carbide into a transparent resin causes a problem of an increase in the incidence of defective molded articles.

Conventionally, in order to remove residues from a molding machine, the following method has been adopted: (1) a method of using a cleaning agent; (2) a method of filling a molding material to be used next into a molding machine without stopping the molding machine, thereby slowly replacing residues and removing the residues; (3) a method of disassembling the molding machine by hand and directly cleaning by pulling out the screw from the barrel (cylinder); and so on.

In recent years, the method (1) using a cleaning agent has been actively used, and there are advantages such that the apparatus does not need to be stopped and the working efficiency is improved. However, when a cleaning agent having a weak cleaning force is used, not only the former molding material remains in the molding machine and is mixed in as foreign matter in the latter molding material, but also the remaining molding material is likely to deteriorate when the molding machine is stopped and to be mixed in as a deteriorated product when the molding machine is restarted. In the method (2), a large amount of molding material is often required to remove the residue, and there are problems that time is required for completion of the operation and a large amount of waste is generated. In addition, when the methods (1) and (2) are used alone, the degraded resin may remain on the screw surface as scorch due to long-term use, and if periodic maintenance is performed before scorch, the method (3) is also frequently used at present.

Among them, the method (3) is also inefficient because the molding machine needs to be stopped. In screw extraction after use of a resin processing machine, a large extraction load may be generated due to dirt on the screw caused by the residue of the resin that has flowed in before, and thus, a large amount of labor is required. Further, since the subsequent operation of peeling off the resin adhering to the screw is required, the disassembly and cleaning can take a lot of time and energy if the man-hour is taken into consideration.

Therefore, an operation of flowing a screw extraction auxiliary agent into the resin processing machine before screw extraction is performed so as to easily extract the screw after the material. By flowing in the screw extraction auxiliary agent, the reduction of the extraction load can be promoted, and the subsequent operation can be facilitated.

Polyethylene and polypropylene, which are general-purpose resins, are mainly used as the screw extraction aid, but they may be used as the extraction aid by using a cleaning agent for a resin processing machine.

The phenomenon and technical idea of the screw extraction aid are not widely known, and patent document 1 describes the use of a metal soap as a lubricant for a cleaning agent. Patent documents 2 and 3 describe the use of a foaming agent. Patent document 4 describes a cleansing composition containing a foaming agent and a fatty acid metal salt in combination.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 59-124999

Patent document 2: japanese laid-open patent publication No. 10-81898

Patent document 3: japanese laid-open patent publication No. 8-295803

Patent document 4: japanese patent laid-open publication No. 2003-276072

Disclosure of Invention

Problems to be solved by the invention

When polyethylene or polypropylene, which is a general-purpose resin, is used as the screw extraction aid, dirt or the like on the screw surface is unlikely to fall off, and the stacked dirt increases the extraction load of the screw, and does not necessarily reduce the extraction load.

In addition, in the transfer of the cleaning agent to the resin processing machine, although some of the surface dirt of the screw may be removed, the cleaning agent itself adheres to the cylinder (barrel) and the screw, and therefore it is difficult to largely suppress the pull-out load. Various additives such as special resins and lubricants added to suppress adhesion are effective means for reducing the load at the time of screw extraction, but there are problems such as reduction in heat resistance due to the additives and increase in cost. In addition, it is difficult to achieve both the cleaning effect and the extraction load reduction effect, and there remains a problem in selecting an additive and setting the content.

The composition described in patent document 1 has an effect as a lubricant, but may be deteriorated at a temperature of a degree of resin processing, so that deterioration of the cleaning agent itself is remarkable under the condition described in patent document 1, and a pulling load is increased due to adhesion caused by deterioration.

In the cleaning agent compositions using a foaming agent described in patent documents 2 and 3, the resin adheres to the cylinder significantly due to the foaming effect, and the pull-out load increases. In the cleaning agent composition described in patent document 4, the resin is degraded during the decomposition and cleaning, and the adhesion increases the extraction load.

The purpose of the present invention is to provide a screw extraction aid capable of greatly reducing the load of screw extraction, which is capable of reducing the friction between a barrel and a screw in addition to discharging resin dirt in a system, and greatly reducing the load when the screw is extracted. The present invention also has the characteristic of improving the ease of stripping the resin adhering to the screw surface after the screw is pulled out, and can significantly improve the convenience of the whole screw pulling-out operation performed in the past, and significantly shorten the time required for disassembling and cleaning the apparatus.

Means for solving the problems

The present inventors have conducted intensive studies to solve the above problems, and as a result, have found that a resin composition containing a specific lubricant (a) and a thermoplastic resin (B) can be used as a screw extraction aid, and have completed the development of the present invention.

That is, the present invention is as follows.

[1] A screw extraction aid for a resin processing machine, characterized in that,

the adjuvant comprises a resin composition containing:

a lubricant (A) having a surface tension of 32mN/m or less and a melting point or softening temperature of 70 ℃ or higher; and

a thermoplastic resin (B) having a surface tension of 5mN/m or more larger than that of the component (A),

the surface tension of the adjuvant after heating at 80 ℃ for 16 hours is 32mN/m or less.

[2] A screw extraction aid for a resin processing machine according to [1], further comprising:

(C) inorganic filler, and

(D) a blowing agent.

[3] A screw extraction auxiliary for a resin processing machine as described in [1] or [2], further comprising:

(E) at least one selected from the group consisting of a fluorine-based resin, an antioxidant and a heat stabilizer.

[4] The screw-extraction auxiliary for resin processing machines according to any one of [1] to [3], wherein the component (A) is at least one selected from the group consisting of an organic acid, a metal salt of an organic acid, and an organic amide.

[5] The screw-extraction auxiliary agent for resin processing machines according to any one of [1] to [4], wherein the component (A) is a zinc salt of an organic acid.

[6] The screw-extraction auxiliary agent for resin processing machines according to [4] or [5], wherein the organic acid is a fatty acid.

[7] The screw-extraction auxiliary agent for resin processing machines according to any one of [1] to [6], wherein the screw-extraction auxiliary agent contains 0.1 to 30 mass% of the component (A), 20 to 70 mass% of the component (C), 0.1 to 20 mass% of the component (D), and 0.01 to 5 mass% of the component (E).

[8] The screw-extraction auxiliary for resin processing machines according to any one of [1] to [7], wherein the component (B) is at least one selected from the group consisting of styrene-based resins and olefin-based resins.

[9] A method for disassembling and cleaning a resin processing machine, characterized in that a screw-extraction auxiliary for a resin processing machine according to any one of [1] to [8] is used.

[10] A method of pre-cleaning a resin processing machine before decomposition, characterized in that the screw-extraction auxiliary for a resin processing machine according to any one of [1] to [8] is used.

[11] Use of a resin composition comprising: a lubricant (A) having a surface tension of 32mN/m or less and a melting point or softening temperature of 70 ℃ or higher; and a thermoplastic resin (B) having a surface tension of 5mN/m or more larger than that of the component (A),

characterized in that the resin composition is used as a screw extraction aid for a resin processing machine.

ADVANTAGEOUS EFFECTS OF INVENTION

The screw extraction aid for a resin processing machine according to the present invention can reduce friction between a barrel and a screw and greatly reduce a load when the screw is extracted, on the basis of discharging resin dirt in a system. The present invention also has the characteristic of improving the ease of stripping the resin adhering to the screw surface after the screw is pulled out, and can significantly improve the convenience of the whole screw pulling-out operation performed in the past, and significantly shorten the time required for disassembling and cleaning the apparatus.

Detailed Description

The following describes in detail a specific embodiment of the present invention (hereinafter referred to as "the present embodiment"). The present invention is not limited to the embodiments described below, and various modifications can be made within the scope of the gist of the present invention.

[ auxiliary for screw extraction ]

The screw-pullout aid for resin processing machines of the present embodiment contains a resin composition containing (A) a lubricant having a surface tension of 32mN/m or less and a melting point or softening temperature of 70 ℃ or higher; and (B) a thermoplastic resin having a surface tension of 5mN/m or more greater than that of the component (A), and the auxiliary may further contain, if necessary, (C) an inorganic filler, (D) a foaming agent, and (E) at least one selected from a fluorine-based resin, an antioxidant, and a heat stabilizer.

The screw-extraction auxiliary agent for a resin processing machine according to the present embodiment may be simply referred to as an auxiliary agent.

[ resin composition ]

The resin composition of the present embodiment contains (A) a lubricant having a surface tension of 32mN/m or less and a melting point or softening temperature of 70 ℃ or higher; and (B) a thermoplastic resin having a surface tension greater than that of the component (A) by 5mN/m or more. The thermoplastic resin composition may further contain (C) an inorganic filler, (D) a blowing agent, and (E) at least one selected from the group consisting of a fluorine-based resin, an antioxidant, and a heat stabilizer, if necessary.

The resin composition of the present embodiment can be used as a screw extraction aid for a resin processing machine.

((A) Lubricant)

(A) The lubricant has a surface tension of 32mN/m or less and a melting point or softening temperature of 70 ℃ or more. (A) The lubricant is suitable for the screw extracting operation by having the above characteristics.

(A) The lubricant has external lubricity, and is required to be oozed out onto the surface of the resin (B) to contribute to load reduction at the time of screw extraction, and easy releasability between the resin and the metal (B). Therefore, as one index, it is effective to specify by surface tension, and (a) a lubricant having a smaller surface tension to (B) a resin is used.

In order to obtain external lubricity, the surface tension of the lubricant (A) is preferably 32mN/m or less, more preferably 28mN/m or less, and still more preferably 26mN/m or less.

The surface tension of the lubricant (a) can be calculated by compression molding the lubricant (a), heating the obtained plate-shaped test piece at 40 ℃ for 16 hours, cooling to room temperature, obtaining the contact angle θ under the following measurement conditions according to JIS R3257, and calculating the surface tension by the following calculation formula. Specifically, the calculation can be performed by the method described in the examples described later.

The measurement conditions were as follows: the liquid used was purified water or diiodomethane, and the average value was used as the measurement result, assuming that the temperature was 23 ℃ and the number of measurements was 5. The reading time was 1 minute after dropping, and the measuring apparatus was used

188(

Company, inc.) and the like.

Calculating formula: (1+ cos θ) γ L ═ 2(γ s)^D·γL^D)^1/2+2(γs^P·γL^P)^1/2

(Gamma L represents the surface tension of the liquid,. gamma.s^D、γs^PA dispersion force component, a polar force component, γ L, each representing the surface tension of the object to be measured^D、γL^PA dispersion force component and a polar force component representing the surface tension of the liquid, respectively. )

In order to stabilize the deterioration and workability during storage and to sufficiently exert the effect of external lubricity, the melting point or softening temperature of the (a) lubricant is preferably 70 ℃ or higher, more preferably 90 ℃ or higher, and still more preferably 110 ℃ or higher.

Examples of the lubricant (a) include, but are not limited to, organic acids, organic acid metal salts, organic acid amides, organic acid derivatives such as organic acid esters, various ester waxes, olefin waxes, and the like. The lubricant (A) is not particularly limited as long as it has a surface tension of 32mN/m or less and a melting point or softening temperature of 70 ℃ or more, and examples thereof include a surface tension of 24mN/m for zinc stearate, a surface tension of 25mN/m for aluminum stearate, and a surface tension of 32mN/m for polyolefin wax.

As the organic acid in the component (A), a saturated fatty acid having 9 to 28 carbon atoms, an unsaturated fatty acid having 9 to 28 carbon atoms, and benzoic acid are preferable. A part of the chain may have a hydroxyl group. In particular, stearic acid, 12-hydroxystearic acid, palmitic acid, myristic acid, and lauric acid are more preferable from the viewpoint of availability and heat resistance. Further, a mixed fatty acid having different alkyl chains may be used. When the number of carbon atoms is in this range, there is no problem of generation of gas or odor, and it is preferable from the viewpoint of easiness of obtaining and smooth exertion of characteristics as a lubricant at the interface.

The organic acid may be a metal salt.

The metal salt in the organic acid metal salt includes, but is not limited to, sodium, potassium, lithium, cesium, magnesium, calcium, aluminum, zinc, iron, cobalt, barium salts, and the like, and among them, lithium, calcium, barium, zinc, or aluminum salts that exhibit the greatest effect as a lubricant are preferred. Among them, metal salts of aluminum and zinc are more preferable because they have low polarity and are likely to exhibit external lubricity by bleeding from the resin (B). Particularly preferred are zinc metal salts.

The hydrocarbon moiety has the same chain length as the fatty acid described above, and stearic acid, 12-hydroxystearic acid, palmitic acid, myristic acid, and lauric acid are preferable from the viewpoint of easiness of obtaining and heat resistance.

Examples of the organic amide in the component (a) include saturated fatty acid amides, unsaturated fatty acid amides, saturated fatty acid bisamides, and unsaturated fatty acid bisamides having 9 to 28 carbon atoms. Among them, from the viewpoint of easiness of obtaining and the effect of the lubricant, fatty acids having 12 to 18 carbon atoms such as lauric acid, myristic acid, palmitic acid, stearic acid, etc., amides of unsaturated fatty acids such as erucic acid, etc., saturated fatty acid bisamides such as ethylene bisstearamide, etc., are preferable, and saturated fatty acid bisamides such as ethylene bisstearamide, etc., are more preferable.

Examples of the organic acid ester and the ester wax in the component (A) include saturated fatty acid esters having 9 to 28 carbon atoms, unsaturated fatty acid esters, medium-chain fatty acid triglycerides, and polyhydric alcohol esters such as hydrogenated oils. Stearyl stearate, glycerin fatty acid ester monoglyceride, and the like are preferred from the viewpoint of ease of obtaining and the effect of the lubricant.

The olefin wax in the component (a) includes, for example, low molecular weight polyolefin, and the kind thereof is not particularly limited, and common low-density or high-density polyethylene, polypropylene, and the like can be used. The lubricant has a molecular weight of about 1,000 to 20,000 in terms of weight average molecular weight and a dropping point of 80 to 180 ℃ and is most easily effective as a lubricant. In the present specification, the weight average molecular weight is a value measured by a method such as gel permeation chromatography using THF or chloroform, which is most common, and the above-mentioned dropping point is not particularly limited, and is a value measured by a method such as using DP70 automatic dropping point/softening point measuring system of METTLER Toledo.

(A) The lubricants may be used alone or in combination of 2 or more kinds depending on the effect. In particular, when a styrene resin or a polyolefin resin is used as the thermoplastic resin (B), it is preferable to combine a fatty acid derivative such as a fatty acid amide or a fatty acid, or another lubricant such as a polyolefin wax with a metal soap such as fatty acid zinc, fatty acid calcium, or fatty acid aluminum, to provide a higher lubricant effect. In addition, the metal soap can also be improved in the effect as a lubricant by a combination of fatty acid calcium, fatty acid aluminum, or the like with fatty acid zinc. In addition, fatty acids can exert further effects by combination with fatty amides and the like.

The content of the lubricant (a) relative to the total amount (100 mass%) of the auxiliary agents is preferably 0.1 to 30 mass%, more preferably 0.2 to 20 mass%, and still more preferably 0.3 to 10 mass%, from the viewpoint of sufficiently obtaining the effect as a lubricant. When the content is the above content, the effect as a lubricant can be sufficiently exerted, and therefore, the extraction load can be further reduced, and the resin can be more easily peeled from the screw surface, which is preferable.

((B) thermoplastic resin)

As the thermoplastic resin (B), a common resin used in injection molding, extrusion molding, or the like can be used. Specific examples thereof include: styrene resins such as polystyrene; polyolefin resins such as polyethylene, polypropylene and polybutylene; acrylic resins such as polymethyl methacrylate; polyvinyl chloride; a polyamide resin; polycarbonate resins such as polycarbonate; a polyester resin; a polyether resin; and so on. Among these, styrene resins and polyolefin resins are preferable.

(B) The thermoplastic resin may be used alone in 1 kind, or 2 or more kinds may be used in combination, and 2 or more kinds of the same kind or different kinds of resins may be used in combination.

(B) The thermoplastic resin needs to have a surface tension greater than that of the lubricant (a), and the greater the difference between the surface tensions of the two, the more easily the external lubricity of the lubricant (a) is obtained as an effect. (B) The surface tension of the resin is 5mN/m or more, preferably 10mN/m or more, more preferably 12mN/m or more, larger than that of the lubricant (A). When two or more kinds of (a) lubricants are combined with two or more kinds of resins, the surface tension difference between the (a) lubricant having the smallest surface tension and the (B) resin having the largest surface tension is 5mN/m or more, preferably 10mN/m or more, and more preferably 12mN/m or more.

The surface tension of the thermoplastic resin (B) can be calculated by compression molding the thermoplastic resin (B), heating the obtained plate-shaped test piece at 80 ℃ for 16 hours, cooling to room temperature, obtaining the contact angle θ under the following measurement conditions according to JIS R3257, and calculating the surface tension by the following calculation formula. Specifically, the calculation can be performed by the method described in the examples described later.

The measurement conditions were as follows: the liquid uses two kinds of pure water and diiodomethane, the temperature is set to 23℃,The number of measurements was 5, and the average value was used as the measurement result. The reading time was 1 minute after dropping, and the measuring apparatus was used

188(

Company, inc.) and the like.

The styrene resin is a copolymer of polystyrene or styrene and 1 or 2 or more other monomers, and the content of a structural unit derived from styrene is 50% by mass or more. Examples of the other monomer copolymerizable with styrene include acrylonitrile, butadiene, and isoprene. Specific examples of the styrene resin include polystyrene, styrene-acrylonitrile copolymer, styrene-butadiene-acrylonitrile copolymer, styrene-isoprene copolymer, and the like. Among these, polystyrene, styrene-acrylonitrile copolymer, and styrene-butadiene-acrylonitrile copolymer are preferable.

The polyolefin-based resin includes ethylene-based resins, propylene-based resins, and the like, and further includes copolymerized resins of ethylene and/or propylene and α -olefins. Among these, polyethylene is preferable because of its low residue in the molding machine and its small friction with metal parts when it remains between the cylinder and the screw.

In order to sufficiently exert the effect of the auxiliary agent of the present embodiment from the viewpoint of the effect as a supplement and the suppression of the residue in the cylinder, the content of the (B) thermoplastic resin is preferably 10 to 90 mass%, more preferably 25 to 50 mass%, relative to the total amount of the auxiliary agent (100 mass%). (B) When the content of the thermoplastic resin is within this range, the effect as a supplement is improved, and the effect of improving the residual property of the auxiliary agent itself and reducing the pull-out load are further improved.

The Melt Flow Rate (MFR) of the thermoplastic resin (B) is preferably 0.005 to 80g/10 min, more preferably 0.01 to 50g/10 min, and still more preferably 0.05 to 30g/10 min, from the viewpoint of adhesion of the resin to a cylinder or a screw. (B) When the Melt Flow Rate (MFR) of the thermoplastic resin is within this range, an excessive load is not applied to the molding machine, adhesion to the metal surface does not easily occur, and increase in extraction load and decrease in heat resistance due to residue are not easily caused.

The melt flow rate of the thermoplastic resin varies depending on the resin, and means a value measured in accordance with ISO-R1133, and with respect to the measurement conditions, the temperature of 190 ℃ and the load of 2.16kg for polyethylene, the temperature of 230 ℃ and the load of 2.16kg for polypropylene, the temperature of 220 ℃ and the load of 10kg for styrene resins represented by styrene-acrylonitrile copolymer and styrene-butadiene-acrylonitrile copolymer, the temperature of 200 ℃ and the load of 5kg for polystyrene, the temperature of 230 ℃ and the load of 3.7kg for PMMA, and the load of 300 ℃ and the load of 1.2kg for polycarbonate. The conditions of the other thermoplastic resins are values measured under standard molding conditions or under MFR conditions recommended by manufacturers in a use temperature range defined for each resin type.

When a single thermoplastic resin is used, it is preferable to use a material within the above-mentioned melt flow rate range, and when 2 or more thermoplastic resins are used, it is preferable to mix the material within the above-mentioned melt flow rate range and the material outside the above-mentioned melt flow rate range and adjust them to the above-mentioned range. In addition, as for the melt flow rate in the case of using 2 or more thermoplastic resins, the condition of the melt flow rate of the most component is used.

(C) inorganic Filler)

Examples of the inorganic filler (C) include calcium carbonate, magnesium carbonate, titanium oxide, zinc oxide, alumina, silica, talc, aluminum hydroxide, magnesium hydroxide, zeolite, wollastonite, mica, diatomaceous earth, glass fiber, glass powder, glass beads, white sand hollow beads, and quicksand, which are generally used. Calcium carbonate, wollastonite, and talc are preferable from the viewpoints of cost, compatibility with the component (a), and enhancement of the effect of improving the screw sliding.

(C) The inorganic filler can be used alone in 1, can also be used in more than 2.

(C) The content of the inorganic filler is not limited, and is preferably 20 to 70% by mass, more preferably 30 to 60% by mass, based on the total amount (100% by mass) of the auxiliary agent, in order to sufficiently exhibit the effect of the lubricant (a). (C) When the content of the inorganic filler is within this range, the effect of the auxiliary agent of the present embodiment improves the dischargeability of the resin before use, and the reduction of the extraction load and the removal of the dirt become easy, which is preferable.

The calcium carbonate preferably has an average particle diameter of 0.1 to 100 μm, more preferably 0.5 to 50 μm.

The average particle diameter (SW diameter) can be calculated by measuring the specific surface area by the air permeation method according to JIS M-8511, or by using an image analysis type particle diameter measuring apparatus.

As wollastonite, a generally commercially available wollastonite can be used, and it is preferable that the aspect ratio is 1 to 30, the average fiber length is 800 μm or less, and the average fiber diameter is 1 to 50 μm. The particle size distribution is measured by an image analysis type particle diameter measuring apparatus, a Ro-Tap type sieve shaker, or the like, and wollastonite having a size within the above range is particularly preferable from the viewpoint of availability and availability.

The average particle diameter of talc is preferably 0.1 to 20 μm. The average particle diameter can be determined by an image analysis type particle diameter measuring apparatus, a laser diffraction method, or the like.

(D) blowing agent)

The screw extraction auxiliary agent for resin processing machines of the present embodiment may contain (D) a foaming agent, and the extraction load at the time of screw extraction can be greatly reduced by a synergistic effect of the lubricating effect by (a) the lubricant and the friction reduction due to the voiding of the resin surface by (D) the foaming agent.

The foaming agent (D) may be any organic or inorganic compound that foams by heating, i.e., generates a gas.

Examples of the organic blowing agent include azodicarbonamide and N, N' -dinitrosopentamethylenetetramine.

Examples of the inorganic foaming agent include inorganic physical foaming agents such as water, bicarbonates such as sodium bicarbonate (baking soda) and ammonium bicarbonate, carbonates such as sodium carbonate and ammonium carbonate, nitrites such as ammonium nitrite, and the like. In particular, bicarbonates such as baking soda and ammonium bicarbonate are preferred for reasons of ease of use and availability.

The shape of the foaming agent (D) is not particularly limited, and it may be used in the form of a composite homogeneous pellet, a mixture obtained from a master batch, a powder mixture, or the like.

The content of the (D) blowing agent is preferably 0.1 to 20% by mass in terms of sufficiently obtaining the foaming effect, and particularly preferably 0.1 to 5% by mass in terms of safely performing the operation and sufficiently obtaining the effect, based on the total amount of the auxiliary (100% by mass). (D) When the content of the foaming agent is in this range, pores of the resin can be appropriately formed, the plasticity effect is enhanced, and the extraction load can be sufficiently reduced.

In the adjuvant of the present embodiment, the mass ratio of the lubricant (a) to the foaming agent (D), (mass of lubricant (a)/mass of foaming agent (D)) is preferably 0.01 to 300, more preferably 0.1 to 100, and even more preferably 1 to 50, from the viewpoint of further reducing the screw pullout load.

(E) at least one member selected from the group consisting of a fluorine-based resin, an antioxidant and a heat stabilizer)

The screw-extraction auxiliary for resin processing machines of the present embodiment may contain (E) at least one selected from the group consisting of a fluorine-based resin, an antioxidant and a heat stabilizer, and (B) selection of a thermoplastic resin and optimization of a compounding ratio are performed by adding a fluorine-based resin capable of suppressing adhesion of the resin to a metal surface and an antioxidant or a heat stabilizer capable of suppressing deterioration of the resin, whereby the adhesion to a screw and the ease of removal of the resin after extraction of the screw can be improved, and the screw extraction operation of the resin processing machine can be further improved by having excellent resin removal performance before removal.

(E) Examples of the fluorine-based resin include PTFE, PFA, PVDF, ETFE, PFE, and the like, which can be expected to have an effect of suppressing adhesion of the resin to a metal surface. Although not particularly limited, PTFE is preferred because it can suppress adhesion of the resin to the metal surface and is relatively excellent in heat resistance.

The shape may be in the form of pellets or powder, and a powder is particularly preferable for uniform dispersion during processing. The average particle size is not particularly limited, but is preferably 1,000 μm or less.

The content of the (E) fluororesin is preferably 0.01 to 5% by mass, more preferably 0.05 to 2% by mass, based on the total amount (100% by mass) of the auxiliary agents, from the viewpoint of obtaining a sufficient effect. (E) When the content of the fluorine-based resin is in this range, the peeling easiness can be imparted to the adhering resin after the screw is pulled out without increasing the load at the time of pulling out the screw. Further, since the resin itself is easily discharged, the screw extraction load due to the remaining resin can be reduced.

The antioxidant and heat stabilizer (E) may include common hindered phenol type, hydroxylamine type, phosphorus type, and vitamins, and are not particularly limited. In particular, hindered phenol antioxidants and phosphorus heat stabilizers are preferred because they can suppress degradation of the resin during decomposition and cleaning, degradation of lubricants such as aliphatic acids and metal soaps, and increase in load during extraction.

From the viewpoint of obtaining a sufficient effect, the content of the (E) antioxidant or heat stabilizer is preferably 0.01 to 5% by mass, more preferably 0.05 to 2% by mass, based on the total amount (100% by mass) of the auxiliary. (E) When the content of the antioxidant or the heat stabilizer is in this range, the effect of inhibiting other additives (such as a lubricant) by the decomposition product of the antioxidant or the heat stabilizer itself can be reduced, and therefore, the content is preferable.

(additives)

In order to further improve the lubricant effect, a lubricant other than the lubricant (a) may be used. Examples of the other lubricant include natural waxes such as beeswax. The other lubricant may be one or two or more of them in combination.

The content of the other lubricant is preferably 0.01 to 20% by mass relative to the total amount (100% by mass) of the auxiliary agent, and more preferably 0.1 to 10% by mass in order to obtain a particularly sufficient effect. When the other lubricant is contained in such an amount, the properties of the active ingredient are not impaired.

The auxiliary agent of the present embodiment may contain a lubricating oil such as mineral oil as an additive component.

The auxiliary agent of the present embodiment is particularly preferably used as a screw extraction auxiliary agent for a resin processing machine, because it is excellent in cleaning performance, reduces a screw extraction load, facilitates separation of a resin from a screw after extraction of the screw, and greatly improves the convenience of the screw extraction operation.

Specific examples of the resin processing machine include a device for processing a resin including a screw, and specifically include an injection molding machine and an extrusion molding machine.

The auxiliary of the present embodiment has a surface tension of 32mN/m or less, preferably 28mN/m or less, and more preferably 25mN/m or less after heating at 80 ℃ for 16 hours. When the surface tension is in the above range, the added (a) lubricant functions as an external lubricant.

In order to control the surface tension of the auxiliary agent within the above range, it is necessary to suppress the degradation of the lubricant (a) due to heat, and when the lubricant (a) is retained at a high temperature, the surface tension tends to be increased.

The surface tension of the auxiliary agent can be calculated by compression molding the auxiliary agent, heating the resulting plate-shaped test piece at 80 ℃ for 16 hours, cooling to room temperature, obtaining the contact angle θ under the following measurement conditions in accordance with JIS R3257, and calculating the surface tension by the following calculation formula. Specifically, the calculation can be performed by the method described in the examples described later.

The measurement conditions were as follows: using purified water as liquidAnd diiodomethane, the temperature was 23 ℃, the number of measurements was 5, and the average value was used as the measurement result. The reading time was 1 minute after dropping, and the measuring apparatus was used

188(

Company, inc.) and the like.

The arithmetic average roughness Ra of the adjuvant of the present embodiment is preferably 5 μm or less, and more preferably 1 μm or less. When the arithmetic average roughness Ra is larger than the above range, the influence of the variation in surface tension due to the surface roughness is not negligible, which is not preferable. Particularly in the case of surface roughness, the surface tension tends to decrease.

The arithmetic mean roughness Ra of the auxiliary agent is a value obtained by compression molding the auxiliary agent and measuring the obtained plate-like test piece by a surface roughness measuring machine in accordance with JIS B0601, and specifically, can be measured by the method described in the examples described later.

(production method)

The method for producing the auxiliary agent of the present embodiment is not particularly limited, and for example, the auxiliary agent can be produced by the following method: a method in which the above components are premixed in a mixer and then kneaded and extruded in an extruder to form pellets; a method of performing melt kneading by a heating roll or a banbury mixer, and then performing granulation; and so on. In order to suppress deterioration of the foaming agent component due to foaming, it is preferable to process the foaming agent component at a temperature not higher than the decomposition foaming temperature. Examples thereof include: a method of granulating after low-temperature extrusion by using an extruder; a method of kneading the mixture with a binder using a pelletizer or the like to prepare a pellet; and so on. In this case, a solid having a melting point at a temperature at the time of granulation, such as olefin wax or lubricant, may be used as the binder component.

The material used for producing the adjuvant of the present embodiment may be a combination of several kinds of pellet samples in a masterbatch system, and the shape and components in the masterbatch are not particularly limited.

[ decomposition cleaning method ]

The decomposition cleaning method of the present embodiment uses the auxiliary agent of the present embodiment. The decomposition cleaning method of the present embodiment includes the following methods: the auxiliary agent of the present embodiment is fed into the resin processing machine, and the auxiliary agent is flowed into the resin processing machine so as to contact at least the screw in the resin processing machine, thereby decomposing the resin processing machine.

The method of cleaning the resin processing machine by decomposition according to the present embodiment is not particularly limited, and the following methods may be mentioned.

The resin was discharged as much as possible, and then a screw extraction auxiliary was added. The amount of the auxiliary agent to be charged is preferably about half to 2 times the cylinder capacity, and the resin is charged to the extent that the auxiliary agent is replaced with the resin. The temperature is preferably set to follow the temperature of the resin before the resin flows into the processing, and is preferably 140 ℃ or higher before the resin is cured and lower than 350 ℃ at which the resin is not decomposed. Removing the auxiliary agent, and performing the operations of die head decomposition and screw rod extraction. When the screw is pulled out, the screw-pulling auxiliary is thrown in, so that the pulling-out load is reduced and the time required for the screw pulling-out operation can be shortened. In addition, in the conventional method, the resin or additive is sticky due to deterioration, and it is difficult to peel off from the screw surface after extraction, which further leads to an increase in the total time taken for decomposition cleaning; however, this can be improved by the effect of the screw-extraction auxiliary agent of the present embodiment, and as a result, the time taken for screw disassembly cleaning can be significantly reduced.

[ Pre-cleaning method ]

In the method of pre-cleaning in the resin processing machine according to the present embodiment before the screw decomposition operation, the auxiliary agent according to the present embodiment is used. The precleaning method of the present embodiment includes the steps of: feeding an auxiliary agent into the resin processing machine, and flowing the auxiliary agent into the resin processing machine so that the auxiliary agent is in contact with at least a screw in the resin processing machine to perform precleaning; further, the method may further include a step of extracting the screw from the resin processing machine.

As the above-mentioned preliminary cleaning method, for example, the auxiliary agent of the present embodiment is charged as an auxiliary agent at the time of ordinary decomposition cleaning, and by removing the auxiliary agent, the resin before the cleaning, the gel derived from the resin, the char, and the like can be discharged. If the amount of dirt is large, the amount of dirt put in the cleaner can be increased to remove the dirt inside the cleaner, and the increase in the pulling-out load due to the stickiness or the like caused by the dirt can be reduced by the preliminary cleaning.

The method for pre-cleaning a resin processing machine according to the present embodiment may further include a step of retaining the auxiliary agent in the resin processing machine.

Examples

The present embodiment will be described more specifically below with reference to examples and comparative examples, but the present embodiment is not limited to the following examples as long as the gist thereof is not exceeded.

The components used in the examples and comparative examples are as follows.

< ingredient (a): lubricant >

(A-1) stearic acid

(A-2) calcium laurate

(A-3) Zinc 12-hydroxystearate

(A-4) ethylene bis stearamide

(A-5) magnesium stearate

(A-6) Zinc stearate

(A-7) glycerin fatty acid ester monoglyceride

The melting point, softening temperature (. degree. C.) and surface tension (mN/m) of the component (A) are shown in Table 1.

< ingredient (B): thermoplastic resin >

(B-1) high-Density polyethylene (density 0.95 g/cm)³、MFR：0.1g/10 min, conditions: 190 ℃ and 2.16kg)

(B-2) Polypropylene (MFR: 0.6g/10 min, conditions: 230 ℃, 2.16kg)

(B-3) styrene-acrylonitrile copolymer (MFR: 27g/10 min, conditions: 220 ℃ C., 10kg)

(B-4) polystyrene (MFR: 2g/10 min, conditions: 200 ℃, 5kg)

(B-5) styrene-butadiene-acrylonitrile copolymer (MFR: 5g/10 min, conditions: 220 ℃ C., 10kg)

(B-6) polymethyl methacrylate (MFR: 4g/10 min, conditions: 230 ℃ C., 3.7kg)

(B-7) polycarbonate (MFR: 4g/10 min, conditions: 300 ℃, 1.2kg)

The surface tension (mN/m) of the component (B) is shown in Table 1.

< ingredient (C): inorganic Filler >

(C-1) calcium carbonate (average particle diameter: 10 μm)

(C-2) Talc (average particle diameter: 5 μm)

(C-3) wollastonite (average fiber length: 200 μm, average fiber diameter: 8 μm, aspect ratio 25)

< ingredient (D): blowing agent >

(D-1) baking soda

(D-2) Azodimethylamide

< ingredient (E): fluorine-based resin, antioxidant, or thermal stabilizer >

(E-1) POLYFLON PTFE-M (average particle diameter 400 μ M, manufactured by Dajin Co., Ltd.)

(E-2) IRGANOX1010 (manufactured by BASF corporation)

(E-3) PTFE Fine powder (average particle diameter 550 μm, manufactured by AGC Co., Ltd.)

< additives >

(F-1) mineral oil (kinematic viscosity 95 mm)²Second)

The adjuvants obtained in examples or comparative examples were evaluated as follows.

[ surface tension ]

The surface tensions (mN/m) of the components (A) and (B) and the samples obtained in the examples and comparative examples were determined as follows.

Component (B) and the sample pellets were compression molded at predetermined temperatures (150 ℃ in the case of a resin having a main composition of B-1, 180 ℃ in the case of a resin having a main composition of B-2, 240 ℃ in the case of a resin having a main composition of B-3, B-4, B-5, B-6, and 280 ℃ in the case of a resin having a main composition of B-7), whereby a plate-shaped test piece (25 cm. times.50 mm) was produced so that the arithmetic mean roughness Ra was 1 μm or less. The surface was wiped clean with a soft cloth, and the plate-like test piece was heated in an oven at 80 ℃ for 16 hours and then cooled to room temperature.

The component (a) was heated to the melting point of each sample in the same manner, and was hot-melted and then compression-molded to prepare a plate-shaped test piece, which was then heated in an oven at 40 ℃ for 16 hours and then cooled to room temperature.

The contact angle θ of the surface of the object to be measured was measured according to JIS R3257.

The measurement conditions used were two kinds of liquids, namely, purified water and diiodomethane, and the average value of the measurement conditions was used as the measurement result, assuming that the temperature was 23 ℃ and the number of measurements was 5. The reading time was 1 minute after dropping, and the measuring apparatus was used

188(

Company, inc.) and the like.

Using the obtained contact angle θ, the surface tension was calculated by the following calculation formula.

(1+cosθ)γL＝2(γs^D·γL^D)^1/2+2(γs^P·γL^P)^1/2

[ arithmetic average roughness Ra ]

The arithmetic average roughness Ra (. mu.m) was measured as follows.

The plate-like test piece used for the measurement of the surface contact angle was measured under the following conditions in accordance with JIS B0601.

The measurement conditions were as follows: 4mm in length, 0.3 mm/s in measuring speed, 0.8mm in sampling length value and 3 times in measuring times; and (3) measuring environment: 23 ℃ and 50% RH; a measuring device: surface roughness profile measuring machine (SURFCOM130A, manufactured by tokyo precision corporation).

[ screw extraction load, resin peeling easiness, cleaning Property ]

500g of a black colored molding material of acrylonitrile-butadiene-styrene copolymerized synthetic resin as a preceding resin (former resin) was charged into a twin screw extruder molding machine (PCM 30 manufactured by Seikagaku corporation, full-flight screw diameter 30mm, L/D40) having a cylinder temperature of 240 ℃ and the screw rotation (100rpm) was continued until the resin discharge was completed, and after the rotation was stopped, the mixture was held at the same temperature for 30 minutes.

Thereafter, the temperature of the cylinder is changed in accordance with the use temperature of the base resin of the auxiliary (the base resin means the resin having the largest content in the composition of the auxiliary, and when a plurality of resins are contained at the same ratio, the resin having the highest use temperature). The resin compositions of B-1 and B-2 were 200 ℃ in the case of the main composition, 240 ℃ in the case of the main composition, and 280 ℃ in the case of the main composition, for the resin compositions of B-3, B-4, B-5 and B-6. The screw-extraction auxiliary 500g obtained in examples or comparative examples was poured in the same manner as in the previous resin.

Thereafter, the resin in the barrel was discharged as much as possible, the die was removed, and the load at the time of pulling out the screw was evaluated. In the drawing, a method of drawing waste cotton yarn ends or the like from a barrel by winding them around the tip of a screw is adopted, and the actual drawing load is based on whether the load is not sensed at all, whether the load is sensed, and whether the screw is not pulled at all. At this time, the screw was set at a drawing speed of approximately 1.5m/10 sec.

Screw extraction load-

Excellent: almost no resin adheres to the grooves of the screw, and no pull-out load is applied.

O (slightly superior): the resin adheres to the grooves of the screw, but there is no extraction load.

Δ (good): the groove of the screw has resin adhered thereto and a pull-out load.

X (bad): the grooves of the screw are adhered with resin, and the screw is difficult to pull out.

Further, a test for peeling off the resin adhering to the screw after the screw was pulled out was performed according to the following evaluation criteria.

Ease of stripping of resin-

Excellent: almost no resin adheres to the grooves of the screw, and peeling does not take much time.

O (slightly superior): the resin adheres to the screw and can be removed by air blowing or hand.

Δ (good): the screw was attached with resin and could be wiped off with a brass brush or the like.

X (bad): the screw is difficult to remove because the resin adheres to the screw and is sticky.

Thereafter, the resin adhering to the screw surface after the auxiliary agent was peeled off, the residue of the screw extraction auxiliary agent, the scorched matter on the screw surface, and the like were visually observed as they are, and the cleaning performance was evaluated based on the following criteria.

Cleaning ability

Excellent: the black colored molding material was completely removed, and no scorching was observed.

Good (slightly excellent): the black colored molding material was mostly removed, and no scorching was observed.

Δ (good): the black colored molding material was removed to some extent, and scorching was slightly observed.

X (bad): the black colored molding material remained on the screw, and scorched material was also produced.

Examples 1 to 21 and comparative examples 1 to 7

[ sample 1]

Compositions containing the components at the ratios shown in table 2 were premixed for 5 minutes in advance using a tumbler mixer, and the resulting mixture was kneaded using a twin-screw extruder. A twin-screw extruder (Toshiba machine, TEM26SS) was used for kneading, and kneading was performed at an extrusion rate of 20 kg/hr at a barrel temperature (200 ℃ in the case of a resin having B-1 and B-2 as the main components, 240 ℃ in the case of a resin having B-3, B-4, B-5, and B-6 as the main components, and 280 ℃ in the case of a resin having B-7 as the main components) set for each resin. The melt-kneaded product thus obtained was extruded into a strand shape, cooled with water, and then cut by a strand cutter to obtain a granular solid substance.

[ sample 2]

For the sample containing the foaming agent, mineral oil as a mineral oil and glycerin fatty acid ester monoglyceride as an ester wax, which are supplemental components, were melted using a pelletizer (Pelleter Double EXD, manufactured by DALTON corporation), and the foaming agent component and the inorganic component were added and kneaded to prepare pellets. Thereafter, the pellets were cut into pellet sizes, and mixed with pellets of the prepared sample 1 by dry blending to obtain an evaluation sample.

Table 2 shows the compounding composition ratios and the evaluation results of examples 1 to 21 and comparative examples 1 to 7.

Industrial applicability

The present invention is excellent as a screw extraction aid which can reduce the load of screw extraction operation during disassembly cleaning and can reduce the man-hour of the whole disassembly cleaning of a processing machine such as resin removal and dirt precleaning thereafter. This can shorten the time-consuming decomposition and cleaning in the past, and can realize the high efficiency of a series of operations including resin molding, and therefore, the industrial value thereof is high.

Claims

1. A screw extraction aid for a resin processing machine, characterized in that,

the adjuvant comprises a resin composition containing:

2. A screw extraction aid for a resin processing machine according to claim 1, further comprising:

(C) inorganic filler, and

(D) a blowing agent.

3. A screw extraction auxiliary for a resin processing machine according to claim 1 or 2, further comprising:

4. A screw-extraction auxiliary for a resin processing machine according to any one of claims 1 to 3, wherein the component (A) is at least one selected from the group consisting of an organic acid, a metal salt of an organic acid, and an organic amide.

5. A screw extraction aid for a resin processing machine according to any one of claims 1 to 4, wherein the component (A) is a zinc salt of an organic acid.

6. A screw extraction aid for resin processing machines according to claim 4 or 5, wherein the organic acid is a fatty acid.

7. A screw-extraction aid for a resin-processing machine according to any one of claims 1 to 6, wherein the screw-extraction aid contains 0.1 to 30 mass% of the component (A), 20 to 70 mass% of the component (C), 0.1 to 20 mass% of the component (D), and 0.01 to 5 mass% of the component (E).

8. A screw extraction aid for a resin processing machine according to any one of claims 1 to 7, wherein the component (B) is at least one selected from the group consisting of styrene resins and olefin resins.

9. A method for disassembling and cleaning a resin processing machine, characterized in that a screw-extraction auxiliary for a resin processing machine according to any one of claims 1 to 8 is used.

10. A method of pre-cleaning a resin processing machine before decomposition, characterized in that the screw-extraction auxiliary for a resin processing machine according to any one of claims 1 to 8 is used.

11. Use of a resin composition comprising: a lubricant (A) having a surface tension of 32mN/m or less and a melting point or softening temperature of 70 ℃ or higher; and a thermoplastic resin (B) having a surface tension of 5mN/m or more larger than that of the component (A),