CN112041397A - Resin composition for antistatic member - Google Patents
Resin composition for antistatic member Download PDFInfo
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- CN112041397A CN112041397A CN201980028267.2A CN201980028267A CN112041397A CN 112041397 A CN112041397 A CN 112041397A CN 201980028267 A CN201980028267 A CN 201980028267A CN 112041397 A CN112041397 A CN 112041397A
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- antistatic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/101—Esters; Ether-esters of monocarboxylic acids
- C08K5/103—Esters; Ether-esters of monocarboxylic acids with polyalcohols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
Abstract
[ problem ] to provide a resin composition for antistatic parts which has both antistatic properties and moldability. [ MEANS FOR solving PROBLEMS ] the above problems are solved by providing a resin composition for an antistatic member to which an antistatic agent and a fluidity improver are added at the same time.
Description
Technical Field
The present invention relates to a resin composition for an antistatic member and a molded article comprising the resin composition for an antistatic member.
Background
Patent document 1 describes a technique of kneading conductive powder such as carbon black as a method of imparting antistatic properties to polybutylene terephthalate resin, polyamide resin, or the like.
However, since these conductive powders generally have high thermal conductivity, there is a problem that when the amount of addition is increased, the flowability is lowered and the moldability is deteriorated.
Further, patent document 2 describes that the use of carbon black having a dibutyl phthalate oil absorption of 250ml/100g or more is effective for securing the fluidity of a polybutylene terephthalate resin.
On the other hand, patent document 3 describes that the use of carbon black having a dibutyl phthalate oil absorption of less than 100ml/100g is effective for securing the fluidity of the polyester resin.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. H09-048909
Patent document 2: japanese laid-open patent publication No. 2009-155565
Patent document 3: japanese patent laid-open publication No. 2016-023291
Disclosure of Invention
Problems to be solved by the invention
The invention provides a resin composition for an antistatic part, which has both antistatic property and moldability.
Means for solving the problems
In the course of research aimed at achieving both antistatic properties and moldability of a resin composition for an antistatic member, the present inventors have found that: the above problems can be solved by using a resin composition for an antistatic member to which an antistatic agent and a flowability improver are added at the same time, and the present invention has been completed.
That is, the present invention relates to the following (1) to (15).
(1) A resin composition for antistatic parts, comprising, per 100 parts by mass of a resin: 4.8 to 9.0 parts by mass of carbon black having a dibutyl phthalate oil absorption of 300ml/100g or more, and 0.01 to 5.00 parts by mass of a flowability improver.
(2) The resin composition for an antistatic member according to (1), wherein the resin is a thermoplastic resin.
(3) The resin composition for an antistatic member according to (2), wherein the thermoplastic resin is a thermoplastic polyester resin.
(4) The resin composition for an antistatic member according to any one of (1) to (3), wherein the flowability improver is a polyhydric hydroxyl group-containing compound having a hydroxyl value of 100 or more.
(5) The resin composition for an antistatic member according to any one of (2) to (4), wherein the thermoplastic resin is a polybutylene terephthalate resin.
(6) The resin composition for antistatic parts according to any one of (1) to (5), wherein the temperature is 260 ℃ for 1000 seconds measured in accordance with ISO11443-1Has a melt viscosity of 200kPa or less.
(7) The resin composition for an antistatic member according to any one of (1) to (6), wherein the dibutyl phthalate oil absorption of the carbon black is 350 to 450ml/100 g.
(8) The resin composition for an antistatic member according to any one of (1) to (7), wherein the content of the carbon black is 5.0 to 7.5 parts by mass with respect to 100 parts by mass of the resin.
(9) The resin composition for an antistatic member according to any one of (4) to (8), wherein the hydroxyl value of the polyvalent hydroxyl group-containing compound is 100 or more and 600 or less.
(10) The resin composition for an antistatic member according to any one of (4) to (9), wherein the content of the polyvalent hydroxyl group-containing compound is 0.05 to 2.5 parts by mass relative to 100 parts by mass of the resin.
(11) A molded article comprising the resin composition for an antistatic member according to any one of (1) to (10).
(12) A flow improver is used as an antistatic aid, wherein 5.0 to 8.0 parts by mass of carbon black having a dibutyl phthalate oil absorption of 300ml/100g or more and 0.01 to 5.00 parts by mass of a flow improver are added to 100 parts by mass of a resin.
(13) The use of the flow improver according to (12) as an antistatic aid, wherein the resin is a thermoplastic resin.
(14) The use of the flow improver according to (13) as an antistatic aid, wherein the thermoplastic resin is a thermoplastic polyester resin.
(15) The use of the flow improver according to any one of (12) to (14) as an antistatic aid, wherein the flow improver is a polyhydric hydroxyl group-containing compound having a hydroxyl value of 100 or more.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, a resin composition for an antistatic member having both antistatic property and moldability can be provided.
Detailed Description
An embodiment of the present invention will be described in detail below. The present invention is not limited to the following embodiments, and can be carried out by making appropriate changes within a range not to impair the effects of the present invention.
[ resin composition for antistatic Member ]
The following examples are provided to illustrate the details of the respective components of the resin composition for an antistatic member of the present embodiment.
(resin)
As an example of the resin, a thermoplastic resin, preferably a polybutylene terephthalate resin (PBT resin) can be cited. The following description will take a PBT resin as an example, depending on the resin, a suitable flowability improver is used.
The polybutylene terephthalate resin at least contains terephthalic acid or an ester-forming derivative thereof (C)1-6Alkyl ester, acid halide, etc.) and a diol component containing at least an alkylene diol having 4 carbon atoms (1, 4-butanediol) or an ester-forming derivative thereof (e.g., an acetylated compound). In the present embodiment, the polybutylene terephthalate resin is not limited to a homopolymeric polybutylene terephthalate resin, and may be a copolymer containing 60 mol% or more of a butylene terephthalate unit.
The amount of terminal carboxyl groups in the polybutylene terephthalate resin is not particularly limited as long as the object of the present invention is not impaired, but is preferably 30meq/kg or less, and more preferably 25meq/kg or less.
The intrinsic viscosity of the polybutylene terephthalate resin is not particularly limited as long as it does not impair the object of the present invention, and is preferably 0.60dL/g or more and 1.2dL/g or less, and more preferably 0.65dL/g or more and 0.9dL/g or less. When a polybutylene terephthalate resin having an intrinsic viscosity within such a range is used, the obtained polybutylene terephthalate resin composition is particularly excellent in moldability. In addition, it is also possible to blend polybutylene terephthalate resins having different intrinsic viscosities to adjust the intrinsic viscosities. For example, a polybutylene terephthalate resin having an intrinsic viscosity of 0.9dL/g can be prepared by blending a polybutylene terephthalate resin having an intrinsic viscosity of 1.0dL/g with a polybutylene terephthalate resin having an intrinsic viscosity of 0.7 dL/g. The intrinsic viscosity of the polybutylene terephthalate resin can be measured, for example, in o-chlorophenol at a temperature of 35 ℃.
When an aromatic dicarboxylic acid other than terephthalic acid or an ester-forming derivative thereof is used as a comonomer component in the production of a polybutylene terephthalate resin, for example, C such as isophthalic acid, phthalic acid, 2, 6-naphthalenedicarboxylic acid, 4' -dicarboxydiphenyl ether and the like can be used6-14The aromatic dicarboxylic acid of (a); c such as succinic acid, adipic acid, azelaic acid and sebacic acid2-16Alkanedicarboxylic acids of (a); cyclohexanedicarboxylic acid and the like C5-10Cycloalkanedicarboxylic acids of (a); ester-forming derivatives (C) of these dicarboxylic acid components1-6Alkyl ester derivatives, acid halides, etc.). These dicarboxylic acid components may be used alone or in combination of two or more.
Among these dicarboxylic acid components, C such as isophthalic acid is more preferable6-12And C such as adipic acid, azelaic acid and sebacic acid4-12An alkanedicarboxylic acid of (a).
When a diol component other than 1, 4-butanediol is used as a comonomer component in the production of the polybutylene terephthalate resin, for example, ethylene glycol, propylene glycol, trimethylene glycol, 1, 3-butanediol, hexamethylene glycol can be usedDiols, neopentyl glycol, 1, 3-octanediol, and the like C2-10An alkylene glycol of (a); polyoxyalkylene glycols such as diethylene glycol, triethylene glycol, and dipropylene glycol; alicyclic diols such as cyclohexanedimethanol and hydrogenated bisphenol a; aromatic diols such as bisphenol a and 4, 4' -dihydroxybiphenyl; bisphenol A C such as bisphenol A ethylene oxide 2 mol adduct and bisphenol A propylene oxide 3 mol adduct2-4An alkylene oxide adduct of (a); or an ester-forming derivative (acetylated product or the like) of these diols. These diol components may be used alone or in combination of two or more.
Among these diol components, C such as ethylene glycol and trimethylene glycol is more preferable2-6And polyoxyalkylene glycol such as diethylene glycol, and alicyclic glycol such as cyclohexanedimethanol.
Examples of the comonomer component that can be used in addition to the dicarboxylic acid component and the diol component include aromatic hydroxycarboxylic acids such as 4-hydroxybenzoic acid, 3-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, and 4-carboxy-4' -hydroxybiphenyl; aliphatic hydroxycarboxylic acids such as glycolic acid and hydroxycaproic acid; c such as propiolactone, butyrolactone, valerolactone, caprolactone (-caprolactone, etc.)3-12A lactone; ester-forming derivatives (C) of these comonomer components1-6Alkyl ester derivatives, acid halides, acetylates, etc.).
The content of the polybutylene terephthalate resin is preferably 30 to 100 mass%, more preferably 40 to 99 mass%, and still more preferably 50 to 98 mass% of the total mass of the resin composition.
(antistatic agent)
As the antistatic agent used in the resin composition for an antistatic member of the present invention, carbon black can be preferably used. Examples of the carbon black include furnace black, ketjen black, channel black, acetylene black, and thermal black, and among these, ketjen black is preferable.
When carbon black is used as an antistatic agent in the present invention, the dibutyl phthalate oil absorption of the carbon black is 300ml/100g or more, preferably 320ml/100g or more, more preferably 350ml/100g or more, further preferably 375ml/100g or more, further preferably 380ml/100g or more, and most preferably 390ml/100g or more, from the viewpoint of improving antistatic properties. On the other hand, from the viewpoint of moldability, the dibutyl phthalate oil absorption of the carbon black is preferably 500ml/100g or less, more preferably 450ml/100g or less, further preferably 425ml/100g or less, further preferably 420ml/100g or less, and most preferably 410ml/100g or less. By setting the dibutyl phthalate oil absorption in the above range, it is possible to provide a resin composition for an antistatic member which has both antistatic properties and moldability.
When carbon black is used as the antistatic agent in the present invention, the amount of carbon black used is 4.8 to 9.0 parts by mass, preferably 5.0 to 8.0 parts by mass, more preferably 5.2 to 7.5 parts by mass, still more preferably 5.4 to 7.0 parts by mass, and most preferably 5.5 to 6.5 parts by mass, based on 100 parts by mass of the resin. By setting the amount of carbon black used to the above range, it is possible to provide a resin composition for antistatic parts which has both antistatic properties and moldability.
When carbon black is used as the antistatic agent in the present invention, the average primary particle size of the carbon black to be used is not particularly limited, but is preferably 5 to 100nm, more preferably 20 to 50nm, and still more preferably 30 to 40nm in order not to impair mechanical properties. The average primary particle diameter in the present invention is an arithmetic average particle diameter obtained by observing 1000 particles of carbon black before being blended in a resin composition by an electron microscope.
(fluidity improver)
As the flowability improver used in the resin composition for an antistatic member of the present invention, a compound containing a polyvalent hydroxyl group having a hydroxyl value of 100 or more is preferably mentioned.
The polyvalent hydroxyl group-containing compound is a compound having 2 or more hydroxyl groups in one molecule. The compound containing a polyvalent hydroxyl group functions as a flowability improver. In general, when a fluidity improver is added to a resin, even if the fluidity can be improved, the deterioration of the properties such as mechanical strength and toughness of the resin itself cannot be avoided. However, by using the polyhydric hydroxyl group-containing compound, the fluidity of the resin composition at the time of melting can be effectively improved while the properties of the resin are maintained at a high level.
The compound containing a polyvalent hydroxyl group can be obtained by a known method, or can be purchased and used.
The hydroxyl value of the polyhydric hydroxyl group-containing compound is preferably 100 or more, more preferably 200 or more, as measured according to the hydroxyl value of Japan oil chemical society 2.3.6.2-1996 (pyridine-acetic anhydride method). When the hydroxyl value is 100 or more, the fluidity-improving effect tends to be further improved, and therefore, the hydroxyl value is preferable. On the other hand, if the hydroxyl value is too large, the reaction with the resin proceeds excessively, thereby lowering the molecular weight of the resin, and there is a fear that excellent properties such as mechanical properties, heat resistance and chemical resistance are impaired, and further, there is a fear that appearance defects and mold fouling of a molded article due to gas generation during molding may occur. The hydroxyl value of the polyvalent hydroxyl group-containing compound is preferably 1000 or less, more preferably 600 or less.
The content of the polyhydric hydroxyl group-containing compound used as the flowability improver is preferably 0.01 to 5.00 parts by mass, more preferably 0.05 to 2.5 parts by mass, even more preferably 0.10 to 2.00 parts by mass, and most preferably 0.10 to 1.00 parts by mass, per 100 parts by mass of the resin. If the content is less than 0.01 part by mass, the effect of improving the fluidity cannot be sufficiently obtained, and if it exceeds 5.00 parts by mass, the molded article may bleed out therefrom, or the appearance of the molded article may be deteriorated due to gas generation during molding, or the mold may be contaminated.
From the viewpoint of imparting fluidity to the resin composition during melting or imparting the resin composition with little decrease in physical properties to the resulting molded article, it is preferable to use, as the polyhydric hydroxyl group-containing compound, a polyhydric alcohol fatty acid ester such as a glycerin fatty acid ester or an ether obtained by addition polymerization of an alkylene oxide to (poly) glycerin. Next, specific examples and the like will be shown in order of the polyhydric alcohol fatty acid ester and the ether obtained by addition polymerization of an alkylene oxide to (poly) glycerin. The term (poly) glycerol refers to glycerol and/or a dehydration condensate of glycerol.
First, the polyhydric alcohol fatty acid ester is an ester of a polyhydric alcohol such as glycerin and/or a dehydration condensate thereof and a fatty acid. Among the polyhydric alcohol fatty acid esters, those obtained using fatty acids having 12 or more carbon atoms are preferred. Examples of the fatty acid having 12 or more carbon atoms include lauric acid, oleic acid, palmitic acid, stearic acid, 12-hydroxystearic acid, behenic acid, and montanic acid. The fatty acid having 12 to 32 carbon atoms is preferable, and the fatty acid having 12 to 22 carbon atoms is particularly preferable. Specifically, lauric acid, stearic acid, 12-hydroxystearic acid or behenic acid is particularly preferable. The use of a fatty acid having 12 or more carbon atoms is preferable because the heat resistance of the resin can be sufficiently maintained and the bleeding of the polyvalent hydroxyl group-containing compound under a high-temperature environment can be suppressed. A carbon number of 32 or less is preferable because the effect of improving fluidity is high. Preferred examples of the polyhydric alcohol include (poly) glycerol such as glycerol and diglycerol, pentaerythritol, and dipentaerythritol.
Examples of the preferable polyhydric alcohol fatty acid ester include glyceryl monostearate, glyceryl monobehenate, diglyceryl monostearate, triglyceryl stearate, tetraglycerol stearate, decaglycerol laurate partial ester, glyceryl mono-12-hydroxystearate, pentaerythritol partial stearate, and the like.
Examples of the ether obtained by addition polymerization of an alkylene oxide to (poly) glycerin include polyoxypropylene diglycerol ether obtained by addition polymerization of propylene oxide to diglycerol, and polyoxyethylene diglycerol ether obtained by addition polymerization of ethylene oxide to diglycerol. In the present invention, among these ethers, polyoxyethylene diglycerol ether is particularly preferably used.
Since a polyol compound containing an alkylene oxide unit, such as an ether obtained by addition polymerization of an alkylene oxide to (poly) glycerin, is usually a liquid, it is more preferable to use a solid polyol fatty acid ester from the viewpoint of handling properties or stability of a molded product in a high-temperature environment.
(Filler)
Fillers may be used as required in the composition of the present invention. In order to obtain properties excellent in performance such as mechanical strength, heat resistance, dimensional stability, electrical properties, and the like, it is preferable to blend such a filler, and it is effective particularly for the purpose of improving rigidity. The filler is used in the form of fiber, powder, or plate depending on the purpose.
Examples of the fibrous filler include glass fibers, asbestos fibers, carbon fibers, silica/alumina fibers, zirconia fibers, boron nitride fibers, silicon nitride fibers, boron fibers, potassium titanate fibers, and further metal fibrous materials such as stainless steel, aluminum, titanium, copper, and brass. Organic fibrous materials having a high melting point such as polyamide, fluororesin and acrylic resin may also be used.
Examples of the particulate filler include quartz powder, glass beads, glass powder, silicates such as calcium silicate, aluminum silicate, kaolin, talc, clay, diatomaceous earth, wollastonite, iron oxides, titanium oxides, aluminum oxides, metal oxides such as aluminum oxides, metal carbonates such as calcium carbonate and magnesium carbonate, metal sulfates such as calcium sulfate and barium sulfate, silicon carbide, silicon nitride, boron nitride, and various metal powders.
Examples of the plate-like inorganic filler include mica, glass flakes, and various metal foils.
The type of the filler is not particularly limited, and 1 or more fillers may be added. Particularly, potassium titanate fiber, mica, talc, and wollastonite are preferably used.
The amount of the filler added is not particularly limited, but is preferably 200 parts by mass or less based on 100 parts by mass of the resin. When the filler is excessively added, moldability is poor and a decrease in toughness is observed.
(additives)
Further, in the composition of the present invention, a known substance generally added to a thermoplastic resin or the like may be added and used in combination in order to impart desired characteristics. For example, any of stabilizers such as antioxidants, ultraviolet absorbers, light stabilizers, hydrolysis resistance improvers, etc., colorants such as lubricants, mold release agents, dyes, pigments, etc., flame retardants, flame retardant aids, etc. may be blended. In particular, the addition of an antioxidant for improving heat resistance is effective.
[ method for producing resin composition for antistatic Member ]
The resin composition for an antistatic member of the present invention may be in the form of a powder-granule mixture or a molten mixture (melt-kneaded product) such as pellets. The method for producing the resin composition according to one embodiment of the present invention is not particularly limited, and the resin composition can be produced by using an apparatus and a method known in the art. For example, the desired ingredients may be mixed and kneaded using a single-screw extruder, a twin-screw extruder, or other melt-kneading device to prepare pellets for molding. Multiple extruders or other melt mixing devices may also be used. Further, all the components may be fed from the hopper at the same time, or a part of the components may be fed from the side feed port.
In addition, when the resin composition for an antistatic member of the present invention is produced, it is preferable to dry each component added in advance and then produce it. For drying, a commonly used rotary evaporator, a dryer, or the like can be used.
Examples
The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples as long as the gist of the invention is not exceeded.
(examples 1 to 3)
Polybutylene terephthalate resin (polybutylene terephthalate resin having an intrinsic viscosity of 0.76dL/g and a terminal carboxyl group content of 22meq/kg, manufactured by WinTech Polymer ltd.), carbon black (having an average primary particle diameter of 35nm and a dibutyl phthalate oil absorption of 396ml/100g), Glass fiber (Nippon Electric Glass Co., manufactured by Ltd., ECS03T-187) and a polyol fatty acid ester (glycerin mono-12-hydroxystearate having a hydroxyl value of 420) as a flowability improver were weighed and mixed in the compounding amounts shown in Table 1 to obtain a polybutylene terephthalate resin composition.
Comparative example 1
As shown in Table 1, unlike examples 1 to 3, a polybutylene terephthalate resin composition was obtained without using an antistatic agent (carbon black) or a flowability improver.
Comparative examples 2 to 6
As shown in Table 1, unlike examples 1 to 3, a polybutylene terephthalate resin composition was obtained without using a flowability improver. In comparative examples 3 and 4, 6.1 parts by mass and 9.4 parts by mass of carbon black having an average primary particle diameter of 41nm and a dibutyl phthalate oil absorption of 280ml/100g were used, and in comparative examples 5 and 6, 6.1 parts by mass and 8.1 parts by mass of carbon black having an average primary particle diameter of 22nm and a dibutyl phthalate oil absorption of 116ml/100g were used.
Comparative examples 7 to 9
Polybutylene terephthalate resin compositions were obtained by weighing and mixing polybutylene terephthalate resin, carbon black (average primary particle diameter 35nm, dibutyl phthalate oil absorption 396ml/100g), glass fiber, and polyol fatty acid ester (mono 12-hydroxystearic acid glyceride having a hydroxyl value of 420) as a flowability improver in the compounding amounts shown in table 1.
Comparative example 10
Polybutylene terephthalate resin, glass fibers, and a polyol fatty acid ester (glycerin mono-12-hydroxystearate having a hydroxyl value of 420) as a flowability improver were weighed and mixed in the blending amounts shown in table 1 to obtain a polybutylene terephthalate resin composition.
Comparative example 11
Polybutylene terephthalate resin, carbon black (average primary particle diameter 35nm, dibutyl phthalate oil absorption 396ml/100g), glass fiber, and polyol fatty acid ester (pentaerythritol tetrastearate having a hydroxyl value of 20) which is not a flowability improver were weighed and mixed in the compounding amounts shown in table 1 to obtain a polybutylene terephthalate resin composition.
The compositions of examples and comparative examples were injection-molded by an injection molding machine at a cylinder temperature of 270 ℃, a mold temperature of 60 ℃, an injection speed of 13 mm/sec and a pressure holding of 60MPa to obtain flat test pieces of 80 mm. times.80 mm. times.3 mm. Using the obtained test piece, the volume resistivity was measured according to IEC 60093. In addition, the respective compositions were measured according to ISO11443 at 260 ℃ for 1000 seconds-1Melt viscosity of (2). The results are shown in Table 1.
[ Table 1]
As shown in table 1, as compared with comparative example 1 in which the antistatic agent and the flowability improver were not used, the volume resistivity was reduced (antistatic property was improved) by adding the antistatic agent and the flowability improver as shown in examples 1 to 3.
From the results of comparative example 2, the result that the fluidity was not good (the melt viscosity was high) was obtained without using the fluidity improver. Further, from the results of comparative examples 3 and 4, when an antistatic agent having a low dibutyl phthalate oil absorption was used without using a flowability improver, the results of high volume resistivity and high melt viscosity were obtained. From the results of comparative examples 5 and 6, when an antistatic agent having a further low dibutyl phthalate oil absorption was used without using a flowability improver, the volume resistivity was high without causing a problem in melt viscosity. That is, as the dibutyl phthalate oil absorption of the antistatic agent decreases, the increase in melt viscosity is suppressed, but the volume resistivity tends to increase. On the other hand, as the dibutyl phthalate oil absorption of the antistatic agent increases, the volume resistivity decreases, but a tendency to increase the melt viscosity is observed, and the influence of the antistatic property and moldability due to the dibutyl phthalate oil absorption of the antistatic agent is in a trade-off relationship, and it has been confirmed that it is difficult to achieve both the antistatic property and the moldability merely by adjusting the dibutyl phthalate oil absorption.
From the results of comparative examples 7 to 9, the results were obtained that when the amount of the antistatic agent was small, the antistatic effect could not be obtained, and when the amount of the antistatic agent was large, the fluidity became unfavorable (the melt viscosity was high). That is, it was confirmed that it is difficult to achieve both antistatic property and moldability only by adjusting the amount of the antistatic agent added, and it was confirmed that in comparative example 9, even if static electricity can be prevented, the volume resistivity is too low, and therefore the insulation property originally required for use as an insulating member is impaired, from such a viewpointThe desired characteristics are not achieved. The volume resistivity required varies depending on the application of the final molded article, and is preferably 1.0 × 10 in view of insulation7Omega cm or more, preferably less than 1.0X 10 from the viewpoint of antistatic property14Ω·cm。
From the results of comparative example 10, in the case where only the flow improver was added without being used in combination with the antistatic agent, the antistatic property was not improved as compared with comparative example 1 where neither the antistatic agent nor the flow improver was added, and the synergistic effect obtained when the antistatic effect by the flow improver was used in combination with the antistatic agent was obtained. That is, the flowability improver in the present invention not only improves moldability, but also exerts an effect as an antistatic property improvement aid, which obtains an effect that cannot be obtained when the flowability improver is used alone, and that differs in such properties and cannot be expected in antistatic property further improvement, by being used in combination with an antistatic agent.
From the results of comparative example 11, when a substance having a low hydroxyl value, which is not a flowability improver but a polyol fatty acid ester, was added, the following results were obtained: even if an antistatic effect by carbon black is obtained, a synergistic effect with the polyol fatty acid ester cannot be obtained, and fluidity becomes unfavorable (melt viscosity is high).
Claims (15)
1. A resin composition for antistatic parts, comprising, per 100 parts by mass of a resin: 4.8 to 9.0 parts by mass of carbon black having a dibutyl phthalate oil absorption of 300ml/100g or more, and 0.01 to 5.00 parts by mass of a flowability improver.
2. The resin composition for an antistatic member as claimed in claim 1, wherein the resin is a thermoplastic resin.
3. The resin composition for an antistatic member according to claim 2, wherein the thermoplastic resin is a thermoplastic polyester resin.
4. The resin composition for an antistatic member according to any one of claims 1 to 3, wherein the flowability improver is a polyhydric hydroxyl group-containing compound having a hydroxyl value of 100 or more.
5. The resin composition for an antistatic member according to any one of claims 2 to 4, wherein the thermoplastic resin is a polybutylene terephthalate resin.
6. The resin composition for antistatic member according to any one of claims 1 to 5, wherein the temperature is 260 ℃ for 1000 seconds measured in accordance with ISO11443-1Has a melt viscosity of 200kPa or less.
7. The resin composition for antistatic members as claimed in any one of claims 1 to 6, wherein the dibutyl phthalate oil absorption of the carbon black is 350 to 450ml/100 g.
8. The resin composition for an antistatic member as claimed in any one of claims 1 to 7, wherein the content of carbon black is 5.0 to 7.5 parts by mass with respect to 100 parts by mass of the resin.
9. The resin composition for antistatic members according to any one of claims 4 to 8, wherein the hydroxyl value of the compound containing a polyvalent hydroxyl group is 100 or more and 600 or less.
10. The resin composition for an antistatic member as claimed in any one of claims 4 to 9, wherein the content of the polyhydric hydroxyl group-containing compound is 0.05 to 2.5 parts by mass with respect to 100 parts by mass of the resin.
11. A molded article comprising the resin composition for an antistatic part as claimed in any one of claims 1 to 10.
12. A flow improver is used as an antistatic aid, wherein 5.0 to 8.0 parts by mass of carbon black having a dibutyl phthalate oil absorption of 300ml/100g or more and 0.01 to 5.00 parts by mass of a flow improver are added to 100 parts by mass of a resin.
13. Use of a flow improver as claimed in claim 12 as an antistatic aid, wherein the resin is a thermoplastic resin.
14. Use of a flow improver as claimed in claim 13 as an antistatic aid, wherein the thermoplastic resin is a thermoplastic polyester resin.
15. Use of a flow improver according to any of claims 12 to 14 as an antistatic aid, wherein the flow improver is a polyhydric hydroxyl group-containing compound having a hydroxyl value of 100 or more.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-086247 | 2018-04-27 | ||
| JP2018086247A JP7026566B2 (en) | 2018-04-27 | 2018-04-27 | Resin composition for antistatic parts |
| PCT/JP2019/017569 WO2019208680A1 (en) | 2018-04-27 | 2019-04-25 | Antistatic-component resin composition |
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| WO2019208680A1 (en) | 2019-10-31 |
| JP2019189791A (en) | 2019-10-31 |
| CN112041397B (en) | 2022-09-02 |
| JP7026566B2 (en) | 2022-02-28 |
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