금속가공용 아민 유화제 및 pH 완충제

금속가공유용 아민은 수용성 절삭유 또는 연삭유를 적정 pH로 유지하면서 산성화 완충, 오일의 수중 유화, 철계 금속의 급속 발청 방지라는 여러 역할을 동시에 수행하는 알칸올아민입니다. Monoethanolamine (MEA, CAS 141-43-5) is the strong, low-cost pH and reserve-alkalinity builder; triethanolamine (TEA, CAS 102-71-6) adds emulsification and yellow-metal-friendly corrosion control. Target a working pH near 8.8-9.2 for most soluble fluids and dose the amine to hold it as the sump ages.

The genuine trade-off is chemical, not commercial. Alkanolamines give a sump long life and good corrosion protection, but with a nitrosating agent present, most often a nitrite-based corrosion inhibitor, secondary-amine content can form N-nitrosamines, a documented metalworking-fluid concern flagged by NIOSH. Primary amines such as MEA form unstable nitroso species; residual diethanolamine in a tertiary-amine grade is the principal precursor. Do not combine nitrite inhibitors with amine-based fluids, and confirm regulatory status for your application and jurisdiction.

Boric acid (CAS 10043-35-3) rounds out the group as an inorganic pH buffer and reserve-alkalinity aid, not an amine, and provides the mild biocidal action that helps hold sump pH and limit spoilage. Keep total water hardness in view, because hard make-up water shifts both pH and emulsion stability. Monitor pH and refractometer concentration weekly, and top up the amine package before pH falls below about 8.5 rather than after corrosion appears.

• 수용성 절삭유 및 연삭유의 pH 관리와 예비 알칼리도 확보
• 수용성 오일 및 세미신세틱 쿨런트용 수중유형 유화
• 유체 내 철계 및 황색 금속 부식 방지
• 완충 및 미생물 제어를 통한 섬프 수명 연장
• 수용성 오일 농축액 제조 시 지방산 중화

• Monoethanolamine — PubChem
• Triethanolamine — PubChem
• Boric acid — PubChem