[논문]Pot Life Assessment and Mechanical Property of Fast Curing Polyurethane Developed with Eco-friendly Pre-polymer

Joseph, Jessy; Moon, Junho; Kong, Tae Woong; Kim, Dong Ho; Oh, Jeong Seok

doi:10.7473/ec.2020.55.1.13

Pot Life Assessment and Mechanical Property of Fast Curing Polyurethane Developed with Eco-friendly Pre-polymer 원문보기

Elastomers and composites = 엘라스토머 및 콤포지트, v.55 no.1, 2020년, pp.13 - 19

Joseph, Jessy (Department of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University) , Moon, Junho (Department of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University) , Kong, Tae Woong (Space-Aeronautics & Advanced Non-Metal Material Center) , Kim, Dong Ho (Space-Aeronautics & Advanced Non-Metal Material Center) , Oh, Jeong Seok (Department of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University)

Abstract ▼ AI-Helper

4,4'-Methylenebis(2-chlorobenzenamine) (MOCA)-free fast curing polyurethanes were prepared. In this study, the processibility of a fast curing polyurethane system was characterized by assessing the pot life. The obtained pot life of the polyurethane was 6-8 s, indicating that this prepolymer-curative system is appropriate for ribbon flow casting. The influence of the NCO index on the viscosity and mechanical properties was evaluated. The viscosity, tensile strength, tear strength, and hardness of the as-prepared polyurethanes showed an increasing trend, with an increase in the NCO index, whereas the elongation at break increased initially and then decreased with an increase in the NCO index. The gel fraction and crosslink density showed a direct correlation with the NCO index, which substantiated the improved mechanical properties at the higher NCO index. The coefficients of friction and abrasion deteriorated with an increase in the NCO index.

주제어

표/그림 (8)

표 Table 1. Composition of Fast Curing Polyurethanes
그림 Figure 1. (a) Viscosity at different NCO index and (b) fluid flow with time of criterion composition with NCO index 100.
$Figure 2. The effect of different NCO index (a) on the gel fraction and (b) crosslink density of polyurethane.$ 그림 Figure 2. The effect of different NCO index (a) on the gel fraction and (b) crosslink density of polyurethane.
그림 Figure 3. The effect of NCO index on tensile strength of polyu-rethane.
그림 Figure 4. The effect of NCO index on tear strength of polyu-rethane.
그림 Figure 5. The effect of NCO index on elongation at break.
그림 Figure 7. The effect of different NCO index (a) on the coefficient of friction and (b) abrasion loss.
그림 Figure 6. The effect of NCO index on hardness.

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문제 정의

16 Therefore, a complete understanding of the rheology of the developed prepolymer system is required. In this work, a complete characterization of the MOCA free fast curing polyurethane is done by assessing pot life and physical properties.

제안 방법

Tensile and tear specimens were punched out using Dumbel type 2 and Type B test specimens respectively, from the molded sheets. The tensile tests were carried out until a failure occur in the sample with a crosshead speed of 500 mm/min and it also provide characteristic information about the elongation at break and final strength of the polymer. KS M 6518 was used to perform tear strength analysis, Crosshead speed: 500 mm/min.

대상 데이터

A load of 10 N and a uniform displacement of 70 rpm was maintained. The measurement was taken using 500 cycle abrasion tester (COAD 101, Ocean Science) with H-18 abrasion wheel. In each testing, the weight of the sample before the test and after the test is keenly measured and the difference is considered to be the abrasion loss.

이론/모형

The crosslink density at different NCO index was determined by using the Flory−Rehner equation.
The sample size, the rotation displacement of the platform, and load for abrasion testing were selected according to ASTM D3389. A load of 10 N and a uniform displacement of 70 rpm was maintained.
The tensile test was executed as per KS M 6518 method in the universal testing machine (Tensometer 2000, Myungjitech). Tensile and tear specimens were punched out using Dumbel type 2 and Type B test specimens respectively, from the molded sheets.

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