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WO2001070900A1 - Antifreeze/coolant composition - Google Patents

Antifreeze/coolant composition Download PDF

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Publication number
WO2001070900A1
WO2001070900A1 PCT/JP2000/001719 JP0001719W WO0170900A1 WO 2001070900 A1 WO2001070900 A1 WO 2001070900A1 JP 0001719 W JP0001719 W JP 0001719W WO 0170900 A1 WO0170900 A1 WO 0170900A1
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WO
WIPO (PCT)
Prior art keywords
antifreeze
coolant composition
metal corrosion
coolant
nonionic surfactant
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PCT/JP2000/001719
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French (fr)
Japanese (ja)
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WO2001070900A8 (en
Inventor
Yuji Miyake
Makoto Horibe
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Shishiai-Kabushikigaisha
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Priority to PCT/JP2000/001719 priority Critical patent/WO2001070900A1/en
Publication of WO2001070900A1 publication Critical patent/WO2001070900A1/en
Publication of WO2001070900A8 publication Critical patent/WO2001070900A8/en

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
    • C23F11/173—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/08—Materials not undergoing a change of physical state when used
    • C09K5/10—Liquid materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/20—Antifreeze additives therefor, e.g. for radiator liquids

Definitions

  • the present invention relates to an antifreeze / coolant composition containing water or dalicol as a main component, and which has an excellent anticorrosion performance for metals, particularly aluminum or aluminum alloys.
  • Metals such as aluminum, aluminum alloys, iron, steel, brass, solder, and iron are used in the cooling system of internal combustion engines such as engines. These metals can corrode on contact with water or air.
  • antifreeze compositions and coolant compositions containing metal corrosion inhibitors such as phosphates, silicates and amine salts have been proposed.
  • phosphate reacts with the hard water component contained in the coolant to form precipitates, which reduces the function of the coolant to prevent corrosion, and deposits deposits to block the cooling system circulation path. Was causing the situation.
  • Amine salts have the disadvantage that they readily react with nitrite to form the carcinogenic substance ditrosamine.
  • silicates have poor stability in antifreeze Z coolant, and easily gel when heat or pH changes or when other salts coexist, and the corrosion prevention function deteriorates. There was a problem of doing.
  • an antifreeze Z coolant composition containing a carboxylic acid such as a hydrocarbon carboxylic acid as a corrosion inhibitor instead of a phosphate, an amine salt or a silicate having the above-mentioned problem has been proposed.
  • the antifreeze / coolant composition (hereinafter simply referred to as composition) of the present invention contains water or glycols as a main component.
  • the daricols include ethylene glycol, propylene glycol, 1,3-butylene glycolone, hexylene glycolone, butylene glycol, glycerin, etc. Among them, ethylene glycol or propylene dalicol is particularly preferable. .
  • This composition is characterized by containing 0.1 to 10% by weight of a metal corrosion inhibitor composed of a nonionic surfactant having a cloud point of 30 to 135 ° C. .
  • This metal corrosion inhibitor composed of a nonionic surfactant contains the above-mentioned water or glycol as a main component, and does not contain a phosphate, an amine salt, and a silicate. Prevents corrosion of aluminum or aluminum alloys, especially.
  • the nonionic surfactant with a cloud point of 30 to 135 ° C which constitutes the metal corrosion inhibitor
  • the temperature of the antifreeze or coolant rises due to the start of the engine, for example, and exceeds the cloud point of 30 ° C
  • the bond between the hydrophilic group and the water molecule is broken and only the lipophilic group (hydrophobic group) has the property. And will be present in the liquid.
  • the nonionic surfactant having the property of only the lipophilic group (hydrophobic group) adheres to the metal surface to form an oil film-like film, and this film effectively prevents metal corrosion. It is thought that.
  • a hydrophobic group is used as a polyionic surfactant.
  • examples include nonionic surfactants having rukyendalcol and having ethylene oxide added as a hydrophilic group.
  • Non-ionic surfactants such as polyxylene ethyleneamino, polyoxypropylene ( ⁇ ) or polyoxypropylene alkynoleate with propylene oxide, polyoxypropylene phenol Nonionic surfactants such as Tenoré, fatty acid polypropylene dalicol, fatty acid polyoxypropylene sorbitan, and polyoxypropylene alkylamino ether, or polyoxyethylene polyoxy, which corresponds to any of the above EO-based and PO-based It can be mentioned non-ionic surfactants such as mouth pyrene Proc polymer.
  • the nonionic surfactant as a metal corrosion inhibitor of the present invention has a cloud point of 30 to 135 ° C. If the cloud point is less than 30 ° C, for example, around room temperature around 25 ° C, the hydrophilic groups of the nonionic surfactant will be separated in the liquid. If the cloud point is higher than 135 ° C, for example, the temperature of the coolant in the radiator when heated by the heat of the engine has an upper limit of 135 ° C, so no separation occurs in the liquid As a result, the above-mentioned coating is not formed.
  • the metal corrosion inhibitor comprising the nonionic surfactant When the metal corrosion inhibitor comprising the nonionic surfactant is applied to the non-phosphorus antifreeze Z coolant composition, its content is in the range of 0.1 to 10% by weight. More preferably, it is 0.5 to 5.0% by weight. When the content of the metal corrosion inhibitor composed of a nonionic surfactant is less than 0.1% by weight, sufficient metal corrosion prevention performance cannot be obtained, and when the content exceeds 10% by weight, the content increases. The performance is not as high as it is, which is wasted and uneconomical.
  • this composition may further contain triazoles in addition to the above components.
  • Triazoles include trinoletriazole and benzotriazole, which have excellent corrosion protection performance against metals, especially copper. These triazoles are desirably contained in the range of 0.05 to 5% by weight in order to maintain excellent corrosion prevention performance.
  • this composition may further contain an antifoaming agent, a coloring agent, and the like in addition to the above-mentioned components, and other conventionally known corrosion inhibitors such as aliphatic monobasic acids and aliphatic dibasic acids Benzoic acid, alkyl benzoic acid, molybdate, tungstate, sulfate, nitrate, mercaptobenzothiazole and alkali metal salts may be used. Further, phosphates, silicates and amine salts can also be used together under certain conditions under which the occurrence of the defects described in the section of the prior art is acceptable.
  • Fig. 1 is a schematic diagram showing the test equipment used for the circulating metal corrosion test.
  • Table 1 shows preferred examples 1 to 3 of the composition of the present invention and examples (comparative examples) containing no nonionic surfactant as an active ingredient in the composition of the present invention. A metal corrosion test was performed.
  • the nonionic surfactant A is a block polymerization type nonionic surfactant composed of hydrophilic ethylene oxide (EO) and hydrophobic propylene oxide (PO). Then, the one having a molecular weight of PO of 950 was used.
  • the nonionic surfactant B is a block polymerization type nonionic surfactant of hydrophilic ethylene oxide (EO) and hydrophobic propylene oxide (PO), and has a molecular weight of PO. 1750 one was used.
  • the circulating metal corrosion test for the above Examples 1 to 3 and Comparative Example was performed for 72 hours at a liquid temperature of 88 ° C. using the test apparatus shown in FIG.
  • the antifreeze / cooling liquid compositions according to Examples 1 to 3 and the comparative example used in the test were diluted to 30 V ⁇ 1% with the preparation water specified in JISK 2234-1994.
  • Aluminum metal, iron, steel, brass, solder, and copper test pieces also specified in JISK2234_1994 were used as the metals to be used. Table 2 shows the results.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

An antifreeze/coolant composition which contains water or glycol as the main component and has an excellent anticorrosive effect on metals, especially aluminum or an aluminum alloy. The composition contains 0.1 to 10 wt.% metal corrosion inhibitor comprising a nonionic surfactant having a cloud point of 30 to 135°C. In the antifreeze/coolant, the surfactant forms an oily coating film on a metal surface. This coating film effectively prevents the metal from corroding.

Description

系田 » 不凍液ノ冷却液組成物  System »Antifreeze coolant composition
技術分野 Technical field
本発明は、 水またはダリコールを主成分とする不凍液/冷却液組成物であって、 金属、 特にはアルミニウムまたはアルミニゥム合金について優れた腐食防止性能 を有する不凍液/冷却液組成物に関する。 背景技術  TECHNICAL FIELD The present invention relates to an antifreeze / coolant composition containing water or dalicol as a main component, and which has an excellent anticorrosion performance for metals, particularly aluminum or aluminum alloys. Background art
エンジン等の内燃機関の冷却系統には、 アルミニウム、 アルミニウム合金、 铸 鉄、 鋼、 黄銅、 はんだ、 鲖などの金属が使用されている。 これらの金属は、 水あ るいは空気との接触により腐食を生じる。 これら冷却系統における金属の腐食を 防止するため、 リン酸塩、 ケィ酸塩あるいはアミン塩といった金属腐食防止剤を 含む不凍液組成物や冷却液組成物が提案されている。  Metals such as aluminum, aluminum alloys, iron, steel, brass, solder, and iron are used in the cooling system of internal combustion engines such as engines. These metals can corrode on contact with water or air. In order to prevent corrosion of metals in these cooling systems, antifreeze compositions and coolant compositions containing metal corrosion inhibitors such as phosphates, silicates and amine salts have been proposed.
ところが、 これらの金属腐食防止剤にあっては、 以下の如き欠点を有していた。 すなわちリン酸塩は、 これが河川等に流入すると、 富栄養化を引き起こし、 水中 の B O D、 C O Dが上昇して藻類が繁殖し、 この結果、 赤潮やスライムが発生す るという問題があった。  However, these metal corrosion inhibitors have the following disadvantages. That is, when phosphates flow into rivers and the like, they cause eutrophication, BOD and COD in water rise, and algae proliferate. As a result, there is a problem that red tide and slime are generated.
またリン酸塩は、 冷却液中に含まれる硬水成分と反応して沈殿を生じ、 これに より冷却液の腐食防止機能が低下し、 さらには沈殿物が堆積して冷却系統の循環 路が閉塞してしまうという事態を引き起こしていた。  In addition, phosphate reacts with the hard water component contained in the coolant to form precipitates, which reduces the function of the coolant to prevent corrosion, and deposits deposits to block the cooling system circulation path. Was causing the situation.
アミン塩は、 亜硝酸塩と反応して発ガン性物質である二トロソァミンを生成し 易いという欠点がある。 またケィ酸塩は、 不凍液 Z冷却液中での安定性に劣り、 熱や p Hが変化した場合や他の塩類が共存する場合には、 容易にゲル化してしま い、 腐食防止機能が低下するという不具合があった。  Amine salts have the disadvantage that they readily react with nitrite to form the carcinogenic substance ditrosamine. In addition, silicates have poor stability in antifreeze Z coolant, and easily gel when heat or pH changes or when other salts coexist, and the corrosion prevention function deteriorates. There was a problem of doing.
そこで、 上記不具合を有するリン酸塩、 アミン塩あるいはケィ酸塩に代わる腐 食防止剤として炭化水素カルボン酸などのカルボン酸類を含ませた不凍液 Z冷却 液組成物が提案されていた。  Therefore, an antifreeze Z coolant composition containing a carboxylic acid such as a hydrocarbon carboxylic acid as a corrosion inhibitor instead of a phosphate, an amine salt or a silicate having the above-mentioned problem has been proposed.
ところがこの不凍液/冷却液組成物にあっては、 力ルポン酸類の持つ金属腐食 防止性能が、 従来より使用されているリン酸塩、 アミン塩あるいはケィ酸塩に比 ベて低いという欠点があり、 リン酸塩等に代わる優れた性能を有する金属腐食防 止剤が求められていた。 However, in this antifreeze / coolant composition, the metal corrosion of There is a drawback that the anti-corrosion performance is lower than that of phosphates, amine salts or silicates which have been used in the past, and there is a need for a metal corrosion inhibitor with excellent performance that can replace phosphates. Was.
本発明者らは、 このような事情からリン酸塩等に代わる優れた性能を有する金 属腐食防止剤について鋭意研究を重ねた結果、 曇点が 3 0〜1 3 5 °Cの非イオン 性界面活性剤が優れた金属腐食防止性能を有することを見い出し、 この知見に基 づいて本発明を完成させたのである。 発明の開示  Under these circumstances, the present inventors have conducted intensive studies on metal corrosion inhibitors having excellent performance in place of phosphates and the like, and as a result, have found that the cloud point is 30 to 135 ° C. They have found that surfactants have excellent metal corrosion prevention performance, and have completed the present invention based on this finding. Disclosure of the invention
本発明の不凍液/冷却液組成物 （以下単に組成物という） は、 水またはグリコ 一ル類を主成分としている。 ダリコール類としては、 エチレングリコール、 プロ ピレンダリコール、 1， 3ブチレングリコーノレ、 へキシレングリコーノレ、 ジェチ レングリコール、 グリセリン等が挙げられるが、 その中でも特にエチレングリコ ール、 或いはプロピレンダリコールが望ましい。  The antifreeze / coolant composition (hereinafter simply referred to as composition) of the present invention contains water or glycols as a main component. Examples of the daricols include ethylene glycol, propylene glycol, 1,3-butylene glycolone, hexylene glycolone, butylene glycol, glycerin, etc. Among them, ethylene glycol or propylene dalicol is particularly preferable. .
この組成物は、 曇点が 3 0〜 1 3 5 °Cの非イオン性界面活性剤からなる金属腐 食防止剤を 0 . 1〜1 0重量％の割合で含むことを最大の特徴としている。 この 非イオン性界面活性剤からなる金属腐食防止剤は、 前述の水またはグリコール類 を主成分とし、 リン酸塩、 アミン塩及びケィ酸塩を含まない不凍液や冷却液中に おいても、 金属、 特にはアルミニウムまたはアルミニウム合金の腐食を防止する。 そのメカニズムは明らかではないが、 冷却系に充填された不凍液や冷却液中に おいて、 金属腐食防止剤を構成する曇点が 3 0〜1 3 5 °Cの非イオン性界面活性 剤は、 液温が曇点以下であれば、 親水基部位の酸素原子と水分子とが緩い水素結 合を作り、 両者は良好に相溶する。 しかしながら、 例えばエンジンの始動により 不凍液や冷却液の温度が上昇し曇点である 3 0 °Cを越えると、 親水基部位と水分 子との結合が切れて親油基 （疎水基） のみの性質となって液中に存在することに なる。 そして、 この親油基 （疎水基） のみの性質となった非イオン性界面活性剤 が金属表面に付着して油膜状の被膜を形成し、 この被膜によつて金属腐食が効果 的に防止されると考えられる。  This composition is characterized by containing 0.1 to 10% by weight of a metal corrosion inhibitor composed of a nonionic surfactant having a cloud point of 30 to 135 ° C. . This metal corrosion inhibitor composed of a nonionic surfactant contains the above-mentioned water or glycol as a main component, and does not contain a phosphate, an amine salt, and a silicate. Prevents corrosion of aluminum or aluminum alloys, especially. Although the mechanism is not clear, in the antifreeze or cooling liquid filled in the cooling system, the nonionic surfactant with a cloud point of 30 to 135 ° C, which constitutes the metal corrosion inhibitor, If the liquid temperature is lower than the cloud point, the oxygen atom in the hydrophilic group and the water molecule form a loose hydrogen bond, and both are well compatible. However, when the temperature of the antifreeze or coolant rises due to the start of the engine, for example, and exceeds the cloud point of 30 ° C, the bond between the hydrophilic group and the water molecule is broken and only the lipophilic group (hydrophobic group) has the property. And will be present in the liquid. Then, the nonionic surfactant having the property of only the lipophilic group (hydrophobic group) adheres to the metal surface to form an oil film-like film, and this film effectively prevents metal corrosion. It is thought that.
このような作用効果を有する非イオン性界面活性剤としては、 疎水基にポリア ルキレンダリコールを持ち、 親水基としてエチレンォキシドを付加した非ィォン 性界面活性剤を挙げることができる。 As a nonionic surfactant having such an effect, a hydrophobic group is used as a polyionic surfactant. Examples include nonionic surfactants having rukyendalcol and having ethylene oxide added as a hydrophilic group.
また、 ポリオキシエチレン系 (E O系) またはエチレンォキシドを付加したポ リォキシェチレンアルキルェ一テル、 ポリォキシエチレンァノレキノレフェニノレエー テル、 脂肪酸ポリエチレングリコール、 脂肪酸ポリオキシエチレンソルビタン、 ポリ才キシェチレンアルキルァミノエーテルなどの非ィォン性界面活性剤、 ポリ ォキシプロピレン系 (ρ ο系) またはプロピレンォキシドを付加したポリオキシ プロピレンアルキノレエーテノレ、 ポリオキシプロピレンァノレキルフエニノレエーテノレ、 脂肪酸ポリプロピレンダリコール、 脂肪酸ポリオキシプロピレンソルビタン、 ポ リォキシプロピレンアルキルァミノエーテルなどの非イオン性界面活性剤、 ある いは上記 E O系、 P O系のいずれにも該当するポリオキシエチレンポリオキシプ 口ピレンプロックポリマーなどの非イオン性界面活性剤を挙げることができる。 本発明の金属腐食防止剤としての非イオン性界面活性剤は曇点が 3 0〜1 3 5 °Cである。 曇点が 3 0 °C以下、 例えば 2 5 °C前後の常温付近のものの場合、 非ィ オン性界面活性剤の親水基が、 液中で分離してしまうことになる。 曇点が 1 3 5 °Cを上回る場合、 例えばェンジンの熱で加熱されたときのラジェータ内の冷却液 の温度は、 その上限が 1 3 5 °Cであるため、 液中で分離が生じないことになり、 前述の被膜形成がなされないことになる。  Polyoxyethylene (EO) or ethylene oxide-added polyoxyethylene alkyl ether, polyoxyethylene anolequinolepheninoleatel, fatty acid polyethylene glycol, fatty acid polyoxyethylene sorbitan, and polyoxyethylene sorbitan Non-ionic surfactants such as polyxylene ethyleneamino, polyoxypropylene (ρο) or polyoxypropylene alkynoleate with propylene oxide, polyoxypropylene phenol Nonionic surfactants such as Tenoré, fatty acid polypropylene dalicol, fatty acid polyoxypropylene sorbitan, and polyoxypropylene alkylamino ether, or polyoxyethylene polyoxy, which corresponds to any of the above EO-based and PO-based It can be mentioned non-ionic surfactants such as mouth pyrene Proc polymer. The nonionic surfactant as a metal corrosion inhibitor of the present invention has a cloud point of 30 to 135 ° C. If the cloud point is less than 30 ° C, for example, around room temperature around 25 ° C, the hydrophilic groups of the nonionic surfactant will be separated in the liquid. If the cloud point is higher than 135 ° C, for example, the temperature of the coolant in the radiator when heated by the heat of the engine has an upper limit of 135 ° C, so no separation occurs in the liquid As a result, the above-mentioned coating is not formed.
この非ィォン性界面活性剤からなる金属腐食防止剤を非リン系不凍液 Z冷却液 組成物に適用する場合、 その含有量を 0 . 1〜1 0重量％の範囲とする。 より好 ましくは 0 . 5〜5 . 0重量％である。 非イオン性界面活性剤からなる金属腐食 防止剤の含有量が 0 . 1重量％を下回る場合、 十分な金属腐食防止性能が得られ ず、 1 0重量％を越える場合には、 含有量が増加した分だけの性能が得られない ので、 その分が無駄になり、 不経済となる。  When the metal corrosion inhibitor comprising the nonionic surfactant is applied to the non-phosphorus antifreeze Z coolant composition, its content is in the range of 0.1 to 10% by weight. More preferably, it is 0.5 to 5.0% by weight. When the content of the metal corrosion inhibitor composed of a nonionic surfactant is less than 0.1% by weight, sufficient metal corrosion prevention performance cannot be obtained, and when the content exceeds 10% by weight, the content increases. The performance is not as high as it is, which is wasted and uneconomical.
またこの組成物中には、 上記成分の他に、 さらにトリアゾール類を含ませるこ とができる。 トリアゾール類は、 ト リノレ トリアゾールやべンゾトリアゾールなど であるが、 これらは金属、 特に銅に対して優れた腐食防止性能を有している。 こ のトリアゾール類は、 優れた腐食防止性能を維持するため、 0 . 0 5〜 5重量％ の範囲で含まれるのが望ましい。 なお、 この組成物には、 前記の成分以外にさらに消泡剤、 着色剤等を含有させ ても良いし、 他の従来公知の腐食防止剤である脂肪族一塩基酸、 脂肪族二塩基酸、 安息香酸、 アルキル安息香酸、 モリブデン酸塩、 タングステン酸塩、 硫酸塩、 硝 酸塩、 メルカプトべンゾチアゾール及びアルカリ金属塩等を使用しても良い。 ま た、 リン酸塩、 ケィ酸塩及びアミン塩についても、 従来技術の箇所で述べた不具 合の発生が容認できる一定の条件下であれば、 併用することもできる。 In addition, this composition may further contain triazoles in addition to the above components. Triazoles include trinoletriazole and benzotriazole, which have excellent corrosion protection performance against metals, especially copper. These triazoles are desirably contained in the range of 0.05 to 5% by weight in order to maintain excellent corrosion prevention performance. In addition, this composition may further contain an antifoaming agent, a coloring agent, and the like in addition to the above-mentioned components, and other conventionally known corrosion inhibitors such as aliphatic monobasic acids and aliphatic dibasic acids Benzoic acid, alkyl benzoic acid, molybdate, tungstate, sulfate, nitrate, mercaptobenzothiazole and alkali metal salts may be used. Further, phosphates, silicates and amine salts can also be used together under certain conditions under which the occurrence of the defects described in the section of the prior art is acceptable.
図面の簡単な説明 BRIEF DESCRIPTION OF THE FIGURES
図 1は、 循環式金属腐食試験に用いる試験装置を示す模式図。  Fig. 1 is a schematic diagram showing the test equipment used for the circulating metal corrosion test.
実施例 Example
下記表 1に示す、 本発明の組成物の好ましい実施例 1〜 3、 並びに本発明の組 成物における有効成分である非イオン性界面活性剤を含まない例 （比較例） につ いて、 循環式金属腐食試験を行った。  The following Table 1 shows preferred examples 1 to 3 of the composition of the present invention and examples (comparative examples) containing no nonionic surfactant as an active ingredient in the composition of the present invention. A metal corrosion test was performed.
(以下余白） (Hereinafter the margin)
(重量％) (% By weight)
Figure imgf000007_0001
Figure imgf000007_0001
尚、 表 1中、 非イオン性界面活性剤 Aには、 親水性のエチレンォキサイド （E O ) と疎水性のプロピレンォキサイド (PO) とのブロック重合型非ィォン性界 面活性剤であって、 POの分子量が 950のものを用いた。 また非イオン性界面活 性剤 Bには、 親水性のエチレンオキサイド （EO) と疎水性のプロピレンォキサ イド （PO) とのブロック重合型非イオン性界面活性剤であって、 POの分子量 が 1750のものを用いた。  In Table 1, the nonionic surfactant A is a block polymerization type nonionic surfactant composed of hydrophilic ethylene oxide (EO) and hydrophobic propylene oxide (PO). Then, the one having a molecular weight of PO of 950 was used. The nonionic surfactant B is a block polymerization type nonionic surfactant of hydrophilic ethylene oxide (EO) and hydrophobic propylene oxide (PO), and has a molecular weight of PO. 1750 one was used.
上記実施例 1〜 3及び比較例についての循環式金属腐食試験は、 図 1に示す試 験装置を用い、 液温 88 °Cの温度条件下で 72時間行った。 尚、 試験に供する実 施例 1〜 3及び比較例に係る不凍液/冷却液組成物は、 J I S K 2234- 1994に定める調合水にて 30 V ο 1 %に希釈したものを使用し、 試験に供す る金属には、 同じく J I S K 2 2 3 4 _ 1 9 9 4に定めるアルミニウム鍚物、 鎳鉄、 鋼、 黄銅、 はんだ、 銅の試験片をそれぞれ使用した。 この結果を表 2に示 した。 The circulating metal corrosion test for the above Examples 1 to 3 and Comparative Example was performed for 72 hours at a liquid temperature of 88 ° C. using the test apparatus shown in FIG. The antifreeze / cooling liquid compositions according to Examples 1 to 3 and the comparative example used in the test were diluted to 30 V ο 1% with the preparation water specified in JISK 2234-1994. Aluminum metal, iron, steel, brass, solder, and copper test pieces also specified in JISK2234_1994 were used as the metals to be used. Table 2 shows the results.
表 2  Table 2
Figure imgf000008_0001
Figure imgf000008_0001
表 2から、 実施例 1〜 3の各組成物については、 比較例に係る組成物に比べて 金属、 特にアルミニウム錡物に対する腐食防止性に優れる結果が得られた。  From Table 2, it was found that each of the compositions of Examples 1 to 3 was superior to the composition according to the comparative example in terms of corrosion resistance to metals, particularly aluminum oxide.

Claims

言青求の範囲 Scope of word blue
1 . 水またはグリコールを主成分する不凍液/冷却液組成物において、 曇点が 3 0〜1 3 5 °Cの非イオン性界面活性剤からなる金属腐食防止剤を 0 . 1〜1 0 重量％の割合で含むことを特徴とする不凍液/冷却液組成物。 1. In an antifreeze / coolant composition containing water or glycol as a main component, 0.1 to 10% by weight of a metal corrosion inhibitor composed of a nonionic surfactant having a cloud point of 30 to 135 ° C. An antifreeze / coolant composition comprising:
2 . 金属腐食防止剤が疎水基としてポリアルキレングリコールを持つ非イオン 性界面活性剤からなることを特徴とする請求項 1記載の不凍液 Z冷却液組成物。  2. The antifreeze Z coolant composition according to claim 1, wherein the metal corrosion inhibitor comprises a nonionic surfactant having a polyalkylene glycol as a hydrophobic group.
3 . 金属腐食防止剤がポリオキシエチレン系またはエチレンォキシド、 および またはポリオキシプロピレン系またはプロピレンォキシドを付加した非イオン' 14 界面活性剤からなることを特徴とする請求項 1または 2記載の不凍液/冷却液組 成物。  3. The method according to claim 1, wherein the metal corrosion inhibitor comprises a polyoxyethylene-based or ethylene oxide, and / or a polyoxypropylene-based or propylene oxide-added nonionic '14 surfactant. Antifreeze / coolant composition.
4 . さらにトリァゾール類を 0 . 0 5〜5重量％の割合で含むことを特徴とす る請求項 1記載の不凍液/冷却液組成物。  4. The antifreeze / coolant composition according to claim 1, further comprising triazoles in a ratio of 0.05 to 5% by weight.
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