본 연구는 물김 양식용 소형부표 소재로서 지방산-주입 목재의 적용 가능성을 평가하기 위하여 수행하였다. 이를 위

하여 삼나무(JAC), 라디에타 소나무(RDP), 편백나무(CYP)에 지방산으로 피마자왁스(HCO) 및 피마자유(CAO)를 침지,

감압, 감가압법으로 주입한 후, 이 시편에 대한 2주 또는 4주간 염수 침수를 통하여 주입량, 용탈성, 치수안정성, 휨강

도를 측정하였다. 지방산 주입량은 RDP(97.62%)에 HCO(114.30%)를 감압(113.49%) 또는 감가압(145.82%) 처리한 시

편에서 가장 많았으며, 이 시편이 염수에 대한 용탈 저항성도 가장 높았다. 한편, 지방산-주입 시편은 대부분 수축하였

으나, 이 시편을 염수에 침수한 이후 측정한 부피팽윤율은 무처리 시편(JAC: 3.97%; RDP: 2.97%; CYP: 2.24%)과 비

교하여 지방산 처리와 함께 감소하였으며, 특히 CAO(1.63%)보다 HCO(0.34%)를 감압 처리한 시편에서 낮았다. 또한

무처리 시편(JAC: 51 MPa; RDP: 53 MPa; CYP: 76 MPa)과 비교하여 HCO를 감압(JAC: 62 MPa; RDP: 67 MPa; CYP:

95 MPa) 또는 감가압(JAC: 66 MPa; RDP: 73 MPa; CYP: 111 MPa) 처리한 시편의 휨강도는 증가하였다. HCO를 감

압법으로 처리하여 제조한 JAC-소형부표는 내충격성을 제외하고 전체 항목에서 해양수산부의 “친환경부표의 성능기

준”을 만족하였다. 내충격성 개선을 위하여 목재 섬유방향의 수직인 횡방향으로 가공한 JAC에 HCO를 감압 처리한

소형부표는 내충격성 시험도 통과하였다. 본 연구의 결과와 함께 목재에 대한 국내 가용성, 제조 비용, 안전성 등과 같

은 생산 조건을 고려하여 횡방향으로 가공한 JAC 소형부표에 HCO를 15분간 감압 처리하는 것이 목재 해양부표 제

조를 위한 최적의 수종, 지방산 및 처리법으로 생각한다. 이 조건으로 제조한 JAC 소형부표는 물김 양식용 부표로서

적용이 가능할 것으로 판단된다.

This study was conducted to evaluate the feasibility of fatty acid (FA)-impregnated wood as a material of

marine buoys for the aquaculture of seaweed. Hydrogenated castor oil (HCO) or castor oil (CAO) as an FA was treated

into Japanese cedar (JAC), radiata pine (RDP) and Japanese cypress (CYP) specimens using an immersion, vacuum (Vac) and vacuum-then pressure (VAC-Pres) treatment. FA-impregnated specimens were submerged in saline water for

2 or 4 weeks, and measured subsequently its leaching resistance, TVS and bending strength. RDP (97.62%) treated with

HCO (114.30%) using a Vac (113.49%) or Vac-Pres (145.82%) treatment showed the highest FA uptake and greatest resistance

against saline water-leaching. Although most FA–impregnated specimens underwent shrinkage, total volumetric swelling

(TVS) after saline-water submersion was lower than untreated control specimens (JAC: 3.97%; RDP: 2.97%; CYP:

2.24%), particularly TVS of Vac-treated specimens impregnated with HCO (0.34%) was lower compared to that with

CAO (1.63%). Bending strength of specimens impregnated HCO using a Vac (JAC: 62 MPa; RDP: 67 MPa; CYP: 95 MPa)

or VAC-Pres (JAC: 66 MPa; RDP: 73 MPa; CYP: 111 MPa) method increased significantly compared to that of control

specimens (JAC: 51 MPa; RDP: 53 MPa; CYP: 76 MPa). JAC-marine buoy treated with HCO using a Vac method met

the “Performance Standards of Environmental-friendly Buoys”, which was designated by the Ministry of Oceans and

Fisheries of the Republic of Korea, in all categories except for impact resistance. JAC marine buoy fabricated with the

transverse direction, which is a perpendicular direction of wood grain, and then treated with HCO using a Vac method

passed the impact-resistance test. Considering the results of this study and production factors such as domestic availability of

wood raw materials, manufacturing cost and safety, it is thought that transverse-processed JAC treated with HCO using

a Vac method for 15 min can be classified as the optimal combination of wood species, fatty acid, and treatment method

for manufacturing wooden marine buoys. It is believed that buoys produced with the conditions can be applied for the

aquaculture of seaweed.

Seaweed aquaculture, Environmental-friendly buoy, Wooden marine buoy, Castor oil, Hydrogenated castor oil

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