[논문]아세틸화 처리 중밀도 섬유판(MDF)의 재질 평가

LEE, Jong Shin; KIM, Soung Joon

doi:10.5658/wood.2020.48.3.393

아세틸화 처리 중밀도 섬유판(MDF)의 재질 평가
Evaluation of Material Properties of Acetylated Medium Density Fiberboard (MDF) 원문보기

목재공학 = Journal of the Korean wood science and technology, v.48 no.3, 2020년, pp.393 - 404

LEE, Jong Shin (Department of Biobased Materials. Chungnam National University) , KIM, Soung Joon (Younglim Timber Co., LTD)

초록
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아세틸화 처리한 라디에타소나무 섬유를 사용하여 제조한 MDF의 수분에 대한 재질 특성을 조사하고 KS F 3200의 섬유판 품질기준과 비교하였다. 아세틸화 처리 MDF는 품질 기준보다 매우 낮은 함수율과 수분 흡수성 및 두께 팽창율을 보여 우수한 치수안정성을 기대할 수 있다. 아세틸화 처리 MDF의 습윤 시 휨강도는 기건 상태 휨강도의 약 70% 이상에 달해 품질 기준에 적합하였다. 아세틸화 MDF의 습윤 시 박리강도가 품질기준의 기건 상태의 최저 박리강도보다 높은 결과를 보여 내수성이 매우 우수하였다. 아세틸화 MDF의 물방울 접촉각은 무처리 MDF에 비하여 커서 낮은 습윤성에 의한 내수성 향상에 기여하는 것으로 판단된다.

Abstract ▼ AI-Helper

This study examined the material properties of MDF manufactured using acetylated pinus radiata fibers against moisture and compared the properties with the fiberboard quality standards of KS F 3200. Since acetylated MDF shows very low moisture content, water absorption and thickness swelling than the quality standards, it is expected to have an excellent dimensional stability. The bending strength in wetting condition of the acetylated MDF reached approximately 70% of the bending strength in dry condition, making it suitable for the quality standards. The internal bond of the acetylated MDF in the wetting condition was higher than the minimum internal bond of the quality standards in the dry condition, showing a good water resistance. Since the water droplet contact angle of the acetylated MDF is larger than that of untreated MDF, it is determined that it contributes in improving the water resistance due to the low wettability.

주제어

표/그림 (8)

표 Table 1. Types of test for mechanical properties of acetylated MDF
그림 Fig. 1. Contact angle analyzer used to measure contact angle of MDF surface.
그림 Fig. 2. Water absorption and thickness swelling of acetylated MDF after water absorption test.
그림 Fig. 3. Bending strength of acetylated MDF in air dry condition and after wet treatment (A-test and B-test).
그림 Fig. 4. Internal bond of acetylated MDF in air dry condition and after wet treatment (A-test).
그림 Fig. 5. Screw holding to the face and edge of acetylated MDF under air dry and wet (A-test) conditions.
그림 Fig. 6. Measurement of water contact angle on MDF face.
그림 Fig. 7. Water contact angle to the face of MDF and acetylated MDF.

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가설 설정

4. The maintenance of a screw holding of the acetylated MDF in the wet condition is relatively inferior to the bending strength or internal bond.
5. The contact angle of water droplets formed on the acetylated MDF is larger than that on the non-acetylated MDF. This contributes to the expression of low wettability and high water-resistance of the acetylated MDF.
b) Soaking for 2 hours in boiling water, followed by 1 hour in cold water.

제안 방법

After collecting test specimen according to the method specified in KS F 3200 (fiberboard), Bending strength, internal bond, condition on screw holding were examined and wettability test was performed (Table 1).
After steeping the MDF specimen in water for 24 hours according to the test method of KS F 3200, the absorption rate and thickness swelling rate were investigated by using the changes in the weight and thickness, as shown in Fig. 2. First, the average absorption rate was 5.
Since this study aims to evaluate the effect of improving the water resistance by the acetylation treatment of MDF, bending strengths tests during wetting both A and B were applied. For the cases of internal bond and screw holding as well, the material performance in a dry condition, as well as the performance after the wet treatment tests of A and B methods, were investigated. The internal bond at the time of wetting was measured after conducting the wet treatment on the specimen bonded to the aluminum block for the internal bond measurement.
). Since this study aims to evaluate the effect of improving the water resistance by the acetylation treatment of MDF, bending strengths tests during wetting both A and B were applied. For the cases of internal bond and screw holding as well, the material performance in a dry condition, as well as the performance after the wet treatment tests of A and B methods, were investigated.
The availability of wettability in a liquid can be measured with contact angle, and the evaluation showed that the smaller the contact angle of the liquid on the wood surface, the better the wettability and the larger the poorer. To compare the water permeability between the non-acetylated MDF and the acetylated MDF, water droplets were dropped on the plane of the MDF according to a predetermined method, and the contact angle of the droplets formed with the surface was measured. Shown in Fig.
To identify the difference in wettability between ordinary MDF without acetylation treatment and MDF with acetylation treatment, the contact angle of the water droplets falling on each board surface was measured and compared. After dropping 0.

대상 데이터

For the measurement, company SEO's contact angle meter (Phoenix 150, Contact angle: 0 ~ 180 ± 0.1°, Frame: 70 frame/sec, CCD camera resolution: 640 × 480 pixels) was used (Fig. 1).
The acetylated MDF was received from company Y in Incheon and used to investigate the material performance on moisture. The received acetylated MDF (14 mm thick) is a board in which the Pinus radiata fiber had been acetylated using a technology developed by company T in the Netherlands, and then bonded with a non-formaldehyde-based adhesive.

이론/모형

The ASTM method is different from the KS F 3200 (fiberboard) test method of Korea. Therefore, this study examined the quality performance of the acetylated MDF distributed in Korea according to the test method of KS F 3200, the domestic quality test standards.
Currently, acetylated medium density fiberboards (MDF) are produced and distributed by company T in the Netherlands, and the product is imported and sold by company Y in Korea. While the manufacturer is posting the product performance on their websites, including material properties against moisture such as product absorbency and thickness swelling, these performances are the results of investigation according to the American Society for Testing and Materials (ASTM) D1037 method. The ASTM method is different from the KS F 3200 (fiberboard) test method of Korea.

성능/효과

2. Even during the wetting process, the acetylated MDF maintains a bending strength of approximately 70% or above of the bending strength under the dry condition. Thus, it meets the KS F 3200 standards for bending strength during the wetting process.
3. Even during the wetting process, the acetylated MDF shows a higher quality than the internal bond under the dry condition specified in KS F 3200. Thus, it indicates a high level of water resistance.
After the wet treatment test B, it was impossible to measure the screw holding due to the weakening of the specimen material. Based on these results, it was revealed that the screw holding at the time of the wetting process of the acetylated MDF was inferior to the bending strength or internal bond at the time of the wetting process.
6 showed a larger contact angle on the acetylated MDF than that reported by Wulf et al. The above results indicate that the acetylated MDF has a poor wettability, the initial penetration mechanism of moisture, compared to the non-acetylated MDF, and this seems to have contributed in part to improve the water-resistance of the acetylated MDF.

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