[논문]PTMG, DMBA 적용에 따른 창상피복 폴리우레탄 수지의 물리적 특성 평가

이주엽

doi:10.12925/jkocs.2020.37.5.1248

PTMG, DMBA 적용에 따른 창상피복 폴리우레탄 수지의 물리적 특성 평가
Evaluation of Physical Properties of Polyurethane Resin for Wound Covering according to PTMG, DMBA Application 원문보기

Journal of the Korean Applied Science and Technology = 한국응용과학기술학회지, v.37 no.5, 2020년, pp.1248 - 1256

이주엽 (중원대학교 융합과학기술대학 소방방재공학전공)

Abstract ▼ AI-Helper

In this study, the polyurethane resin was synthesized by applying PTMG and DMBA of different composition ratios for the synthesis of water-dispersible polyurethane used in wound coating resin. The varying properties of the synthesized water-dispersible polyurethane were measured through tensile strength, elongation, and abrasion resistance analysis. As for the tensile strength measurement result according to the PTMG content, the sample with the highest reaction molar ratio was measured as 1.08 kgf/mm2 and the elongation was measured as 520%. As for the tensile strength result according to the DMBA content, the sample with the highest reaction molar ratio was measured as 0.51 kgf/mm2, and the elongation was measured as 435%. The degree of surface destruction by the abrasion resistance measurement was visually confirmed through SEM.

주제어

표/그림 (8)

표 Table 1. Polyurethane resin composition table with different synthesis ratios of PTMG, DMBA, and IPDI
그림 Fig. 1. Synthesis process of water-dispersible polyurethane.
그림 Fig. 2. Tensile strength measurement result of polyurethane resin with different PTMG composition ratio.
그림 Fig. 3. Tensile strength measurement result of polyurethane resin with different DMBA composition ratio.
그림 Fig. 4. Elongation measurement result of polyurethane resin with different PTMG composition ratio.
그림 Fig. 5. Elongation measurement result of polyurethane resin with different DMBA composition ratio.
그림 Fig. 6. Abration resistance measurement result of polyurethane resin with different PTMG composition ratio by SEM.
그림 Fig. 7. Abration resistance measurement result of polyurethane resin with different DMBA composition ratio by SEM.

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제안 방법

In addition, in order to impart ionicity to the prepolymer, dimethylolbutanoic acid (DMBA) was applied to impart ionicity to the prepolymer, and the polyurethane resin for water-dispersible wound coating was synthesized through emulsification[12-15]. As for the water-dispersed polyurethane resin, samples were prepared by varying the number of moles of reaction of PTMG, IPDI, and DMBA, and the change in physical properties according to the composition change was analyzed.
In this study, polyol and carboxylic acid were used for diisocyanate (IPDI) in the preparation of polyurethane prepolymers for the synthesis of water-dispersible polyurethane wound coatings. As the polyether polyols, polytetramethylene glycol (PTMG) having two or more hydroxyl groups in the molecule and having a molecular weight of 2000 is used[11].
, USA) was used to measure tensile strength and elongation properties to check the physical properties change of the synthesized water-dispersed urethane. Taber abrasion tester (TO 880T, Test One, Inc.) was used to measure the wear resistance, and SEM (Scaning electron microscope, Saron Tech, Korea) was used to visually check the condition of the destroyed surface.
The prepared resin was prepared as a film to determine the tensile strength and elongation, and the abrasion resistance was measured by spray coating on the leather surface, and the following results were obtained.

대상 데이터

Polyether polyols used for polyurethane synthesis for this study were polytetramethylene glycol (PTMG, molecular weight 2000, Junsei chem.Co.) and isophorone diisocyanate (IPDI, Bayer), which is an aliphatic diisocyanate. Dimethylolbutanoic acid (DMBA, GEO) was used to introduce a hydrophilic group using a carboxy group, and acetone (BASF) was used to suppress an increase in viscosity that occurs when imparting ionicity to the prepolymer.

성능/효과

As a result of the tensile strength test, the polyurethane film containing a small amount of PTMG (3.00 mol) was measured as 1.78 kgf/㎟, and the tensile strength of the urethane film containing a large amount of PTMG (3.60 mol) was measured as 1.08 kgf/㎟. As the ratio of the NCO groups of the isocyanate reacting to the OH group of the polyol increased, the number of reactors involved in chain extension decreased, tensile strength decreases due to lower cohesion.
As a result of this, it was confirmed that the tensile strength decreased as the synthesis ratio of the polyol increased. This is the final step of the water-dispersed polyurethane, which is the soft segment cohesion by chain extension, which increases the chain extension as the isocyanate bond ratio to the polyol increases.
Therefore, in the case of the same elongation, it was found that the elongation was increased from 394% to 495%. As for the surface strength of the resin according to the content ratio of PTMG and DMBA, as the amount of PTMG and DMBA increased, the cohesiveness due to chain extension decreased, and the result was confirmed that the surface strength decreased.
In the presented measurement results, in the case of sample D-1 prepared with a synthesis ratio of 0.03 mol of DMBA, the tensile strength was measured as 0.97 kgf/㎟, and in the case of sample D-4 prepared with a synthesis ratio of 0.09 mol, the tensile strength was 0.51 kgf/㎟ As the synthesis ratio of DMBA increases, the tensile strength decreases.
In the presented measurement results, in the case of sample P-1 prepared with a synthesis ratio of 3.00 mol of PTMG, the tensile strength was measured as 1.78 kgf/㎟, and In the case of sample P-4 prepared with a synthesis ratio of 3.60 mol, the tensile strength was measured to be 1.08 kgf/㎟.
In the presented measurement results, the elongation value of Sample D-1 prepared with a synthesis ratio of 0.03 mol of DMBA was measured to be 349%, and in the case of Sample D-4 prepared with a synthesis ratio of 0.09 mol, the elongation value was measured as 435%. In this way, it was confirmed that the elongation increased as the synthesis ratio of DMBA increased.
4 shows the results of measuring the elongation of the samples with different synthesis ratios of PTMG. In the presented measurement results, the elongation value of Sample P-1 prepared with a synthesis ratio of 3.00 mol of PTMG was measured to be 422%, and in the case of Sample P-4 prepared with a synthesis ratio of 3.60 mol, the elongation value was measured as 520%.
These results confirmed that the elongation increased as the synthesis ratio of the polyol increased. It can be confirmed that the soft segment cohesiveness due to chain extension of the water-dispersed polyurethane decreased the ratio of isocyanate bonding to the polyol, so that the reaction of the NCO group of the chain end groups involved in the chain extension was reduced, and the elongation increased by softening the film.

참고문헌 (15)

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상세보기
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상세보기
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표제어: PCR

동의어: Packet Collision Rate

용어 설명 출처 목록 (6)

용어 설명: PCR은 세균 특이성이 있는 primer를 이용하여 적은 수의 세균이 있을지라도 쉽게 검출할 수 있는 유용한 방법이며, 이를 이용하여 구강 내 치면세균막이나 타액에서 직접 세균을 검출할 수 있게 되었다[8].

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