• Title, Summary, Keyword: ACQ

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Prediction of Alkaline Copper Quat (ACQ) Wood Preservative Concentration by Turbidity (탁도에 의한 구리·알킬암모늄화합물계 목재방부제(ACQ)의 농도 예측)

  • Lee, Jong Shin;Kim, Kyoung Tae;Choi, Gwang Sik
    • Journal of the Korean Wood Science and Technology
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    • v.44 no.5
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    • pp.743-749
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    • 2016
  • The concentration control of wood preservatives is necessary to produce a preservative treated wood having a uniform quality. Concentration measurement method of wood preservatives to be easily used in the field has not been developed yet. This study examined the way to estimate the concentration from turbidity of ACQ wood preservative that can be relatively easily measured by using a portable turbidity meter. The addition of phosphoric acid solution in an alkaline ACQ solution having a very low turbidity is created a suspension of the white substance and the turbidity suddenly increased. The optimum amount of addition of the phosphoric acid solution is until the pH of ACQ solution reaches 7, the turbidity of the ACQ solution reaches maximum value. Excessive addition of the phosphoric acid solution results in a turbidity decrease with acidification of the ACQ solution. Also ACQ solution becomes transparent. The high significance was recognized with positive correlation between the concentration and the turbidity of the ACQ solution. From the t-test, The significant difference between the actually measured concentrations and the concentrations predicted by the regression equation for industrial ACQ solutions was not recognized. Thus, it was possible to know that concentration prediction and control of industrial ACQ solution using the turbidity and a regression equation. Therefore, using the regression equation and turbidity is expected to be able to management the concentration of ACQ solution in the industrial field.

Service Life Estimation of ACQ-treated Wood Based on Biodeterioration Resistance

  • Pang, Sung-Jun;Hong, Jung-Pyo;Lee, Jun-Jae;Oh, Jung-Kwon
    • Journal of the Korean Wood Science and Technology
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    • v.43 no.5
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    • pp.641-651
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    • 2015
  • The aim of this study was to estimate the service life of alkaline copper quaternary (ACQ)-treated wood. The service life of preservative-treated wood was estimated by comparing a residual quantity of ACQ in wood with toxic threshold to fungi. Indoor and outdoor leaching tests were carried out in order to predict residual ACQ quantity within wood. As a result, the leaching ratio of ACQ from treated wood above ground via precipitation was 18.1% for 50 years. When the H4 treated wood, which is traditionally used in contact with the ground and fresh water, is used above-ground, the leaching ratio of ACQ for 50 years is 18.1% and the residual quantity of ACQ is $4.2kg/m^3$, which is higher than the toxic threshold of ACQ. Thus, the H4 treated wood used above-ground will be resistant to biodeterioration for at least 50 years.

Adsorption Characteristics of Alkaline Copper Quat Preservative Components in Wood (구리⋅알킬암모늄화합물계 목재방부제 (ACQ) 유효성분의 목재 흡착 특성)

  • Lee, Jong-Shin;Choi, Gwang-Sik
    • Journal of the Korean Wood Science and Technology
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    • v.42 no.4
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    • pp.491-498
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    • 2014
  • In order to obtain basic data for concentration control of alkaline copper quat (ACQ) solution in wood preservative treatment, this study investigates the change of concentration and adsorption of treating solution and active ingredient, copper oxide (CuO) and didecyldimethyl ammonium chloride (DDAC), in the process of recycling of ACQ solution. Japanese larch (Larix leptolepis), Douglas-fir (Psedotsuga menziesii) and Radiata pine (Pinus radiata) were treated with ACQ solution. The active ingredient concentration of ACQ solution was decreased continuously with increase of recycling. There are differences between extent of concentration decrease of Cu (as CuO) and DDAC. DDAC was decreased more quickly and to a higher degree than Cu for all recycling. The extent of DDAC concentration decrease was remarkable than that of Cu for wood species. The amount of DDAC adsorbed into wood decreased with the increase of ACQ solution recycling, but adsorption of Cu was little difference regardless of recycling. The adsorption of Cu into wood increased as DDAC concentration decrease by recycling of ACQ solution. This is likely due to decrease of DDAC competition with Cu for the same reaction site in wood.

Decay Efficacies of Plywoods Manufactured by ACQ-treated Veneers of Domestic Softwood and Hardwood Species

  • Suh, Jin Suk;Lee, Hyun Mi;Hwang, Won Jung;Hwang, Sung Wook;Lee, Dong Heub;Park, Sang Bum
    • Journal of the Korea Furniture Society
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    • v.25 no.3
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    • pp.233-237
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    • 2014
  • The eco-friendly preservatives such as ACQ or CUAZ have been used in landscape architectural facilities these days. In this study, the decay efficacies of ACQ treatments were evaluated according to domestic veneer species, concentration of ACQ, weathering test, adhesive type, and fungus type. In case of veneer species, hinoki cypress and yellow poplar showed the highest and lowest decay resistance, respectively. And the decay resistance appeared to be greater in plywoods bonded by resorcinol resin-bonded plywood and non-weathering treated plywood than polyurethane resin-bonded plywood and weathering treated plywood.

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Development of Coloring Method of Didecyldimethylammonium Chloride (DDAC) in Wood Treated with Alkaline Copper Quat (ACQ) Preservative (구리·알킬암모늄화합물계 목재방부제(ACQ)를 처리한 목재 중의 Didecyldimethylammonium Chloride (DDAC) 성분의 발색처리 방법 개발)

  • Lee, Jong Shin;Choi, Gwang Sik
    • Journal of the Korean Wood Science and Technology
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    • v.46 no.3
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    • pp.253-259
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    • 2018
  • To determine the depth of preservative penetration in ACQ treated wood, the degree of penetration of Cu was measured. In this study, we developed a DDAC coloring method to investigate the penetration depth of DDAC, which is one of the active ingredient of ACQ, into wood. The following conclusions were obtained. The DDAC component reacts with a 2', 7'-dichlorofluorescein indicator and results in a deep orange color. This orange coloring reaction appears not only in DDAC solutions but also in ACQ treated wood tissues in which DDAC is present. It is possible to visually verify that DDAC has better wood penetration than Cu in the spruce, which is an refractory wood species, by the DDAC coloring method developed this study. In addition to the results, it is necessary to investigate the difference in penetration of Cu and DDAC for other wood species with poor preservative penetration.

Penetration of ACQ Treatment and its Effect of Degradation on Wood Tissues (Structure) (ACQ 약제의 목재 내 침투 및 부후 특성에 미치는 목재 조직의 영향)

  • Lee, Hyun-Mi;Lee, Dong-Heub;Hwang, Won-Joung
    • Journal of the Korean Wood Science and Technology
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    • v.41 no.6
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    • pp.576-582
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    • 2013
  • To obtain the basic information on wood preservative process using copper, the penetration ACQ-2 preservative agent into Douglas fir wood and its degradational characteristics were investigated. Douglas fir is known to be difficult for preservative agent injection. To find the hindrance factor of the preservatives movement, the ray height, ray density, and length of tracheid were measured and observed by a stereoscopic microscope and scanning electron microscope. The results were compared in the well-penetrated parts of preservatives and insufficient parts. There were no significant differences in height, length, and density between both parts, except for the pits of the wood elements observed in SEM micrograph. More declosed pits were found in the well-penetrated parts of preservatives. Decay characteristics of wood specimen treated with various ACQ concentrations by brown-rot fungi was observed by an optical microscope. The decayed properties of tracheid, rays, and resin canals was found in the non-treated wood specimens and it was also found that some extent of preservatives concentration is necessary to protect the decay.

A Study on the Development of functional standard for 2G MNP by ACQ (ACQ 방식의 2G 이동전화번호이동성 구현을 위한 망기능 규격에 관한 연구)

  • 정영식;곽용원;민재홍;김환우
    • Proceedings of the IEEK Conference
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    • pp.165-168
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    • 2003
  • 이동전화 번호이동성 구현을 위한 망기능 규격은 ACQ 방식으로 이동전화 번호이동성 (Mobile Number Portability, MNP)을 2G 이동전화 상호간에 제공하기 위한 망의 기능구조 및 정보흐름을 규정한다. 본 논문에서는 번호이동성 요구사항에 따라, 소요되는 망기능 및 시스템 기능을 정의하고, 이들 기능간에 주고받는 정보를 규정한다. 본 논문은 번호이동성에 따른 SMS(Short Message Service)의 처리방법 또한 규정한다.

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Wireless Triggering Pulse Generation for Digital X-ray Imaging System (디지털 x-ray 영상시스템을 위한 무선 트리거 발생기)

  • Ko, Dae-Sik;Lee, Jae-Cheol;Lee, Joo-Shin
    • The Journal of Advanced Navigation Technology
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    • v.11 no.2
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    • pp.163-169
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    • 2007
  • In this paper, we propose a method of trigger pulse generation to capture the image on time by making a synchronization between the x-ray generator and digital x-ray image acquisition system. we designed a wireless trigger pulse generation circuit to make a synchronization between x-ray generator and digital image acquisition system and analysis its performance. When it starts to detect a certain level of x-ray radiation or above from the air, this method starts to generate a ACQ_START signal to indicate the timing for image acquisition starting from digital image acquisition system. Hence, when it starts to detect under certain level of x-ray signal from the air, this method starts to generate a ACC_END signal to indicate the timing for image acquisition stop from digital image acquisition system. Image acquisition is activated only this time between ACQ_START and ACQ_END signal. By doing this wireless detecting of x-ray signal from remote, we can get more accurate timing for capturing the x-ray image and any type of x-ray generator can be connected to digital image acquisition system, regards of wired protocol. This makes easy installation. We could get 3.5 line pair / mm resolution at 20 mAs of x-ray level with resolution chart. This is same or better image comparing to conventional wired result.

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Evaluation of Leaching Stability of Preservative Treated Wood in the Seawater for the use of a Fish-breeding Ground (해양어초사용을 위한 방부목재의 해수 용탈성 평가)

  • Lee, Myung Jae;Lee, Dong-Heub;Son, Dong-Won
    • Journal of the Korean Wood Science and Technology
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    • v.33 no.3
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    • pp.53-63
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    • 2005
  • This study attempted to obtain the basic data of utilizable possibility of preservative treated wood as a material used in a marine ranch. To evaluate the leaching stability of CCA-, CCFZ-, and ACQ-treated woods in seawater, the specimens treated with 2% and 3% (w/v) of CCA, CCFZ, and ACQ were exposed to deionized water, synthetic seawater and natural seawater for 41 days and then each component released was periodically determined. There was little amount of copper and chromium released from CCA-treated wood exposed in both deionized and seawater. Although relatively large amount of arsenic was released from CCA-treated wood, the release rate in seawater was lower than that in deionized water. The release rate of chromium and zinc from CCFZ-treated wood were somewhat greater in deionized water, but lower in seawater than in deionized water. Retention level and salinity of synthetic seawater had little effect on the release rate of components. The ACQ-treated wood had greater copper release than CCA- and CCFZ-treated wood, and the amount of copper released did not affected by leaching media used.