Effect of reactive polyurethane on toughness of unsaturated polyester resin

Min, Kyung‐Eun; Hwang, Yeong-Geun; Choi, Gwan-Young; Kim, Ho-Gyum; Kim, Woo‐Sik; Lee, Dong‐Ho; Park, Lee-Soon; Seo, Kap-Ho; Kang, Inn‐Kyu; Jun, Il-Ryun; Lim, Jeong-Cheol; Song, Hwan‐Jin

doi:10.1002/app.10169

Cited by 11 publications

(2 citation statements)

References 15 publications

(23 reference statements)

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“…The Fluid Dynamics Mathematical Model of Agitator Tank. Numerous studies indicate that the Non-Newtonian behavior of the polyurethane materials is only in the vicinity of the gel point [9][10]. In addition, according to the Castro, macoskot proposed the viscosity model:…”

Section: Mathematical Modelmentioning

confidence: 99%

The Research on Two-Component Materials Mixed Method for Vacuum Casting

Zhang

Liu

et al. 2013

AMR

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To solve vacuum casting process exist two-component polyurethane difficult to uniform mixing problems. A non-symmetric eccentric large blade agitator was proposed and the speed was period changed to strengthen the mixed effects. A fluid dynamics of variable speed agitator tank was proposed to numerical simulation flow behacior with Euler - Euler two-fluid model and the dynamic mesh (SM) method. Though numerical simulate to study flow field characteristics of variable speed agitator tank.. The experiment results show that the proposed method can not only achieve high viscosity polyurethane resin with uniform mixing, and shorten the processing time. Effectively solve the polyurethane resin materials difficult to uniform mixing problems.

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Section: Mathematical Modelmentioning

confidence: 99%

The Research on Two-Component Materials Mixed Method for Vacuum Casting

Zhang

Liu

et al. 2013

AMR

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“…It is due to increase in molecular weight. The decrease in melting point with increase in alkyl length of the aldehydic group can be explained in terms of increase in molecular mobility, differences in molecular feature, crystallinity and crystalline orientation (Chain and Yi., 2001;Sekaran et al, 2001;Min et al, 2002). Thus, the softness of the amino resins increases with increase in alkyl length of the aldehydic group.…”

Section: Melting Pointmentioning

confidence: 99%

Development of amino resins for emulsion paint formulation: effect of aldelhydic group and degree of substitution

Barminas¹

2007

Afr. J. Biotechnol.

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In our continuous effort to develop a paint binder from amino resins, amino resins from different aldehydic groups were synthesized to produce urea, formaldehyde (UF), urea acetaldehyde (UA), urea proparaldehyde (UP) and urea butaldehyde (UB) at different degree of substitution (Mono -tetra). Some physical properties of these resins were evaluated. The viscosity, gel time, density and refractive index of the resins (except UB) were found to increase with increase in alkyl length of the aldehydic group while turbidity (except UF) increased with increase in alkyl length of the aldehydic group. On the other hand, melting point and moisture uptake decreases with increase in alkyl length of the aldehydic group. In the case of the degree of substitution the viscosity, turbidity, melting point and moisture uptake increases with increase in the degree of substitution while the gel time and refractive index were found to decrease with increase in the degree of substitution. However, an initial rise followed by a gradual fall was recorded for density for the different degree of substitution for all the resins. Samples for UF and UA with the exception of monoethylol urea were too hard brittle and has low water resistance while those of UP and UB resins were too soft and remained as semi solid in the cured state at room temperature (30 o C). This result indicates that these resins cannot be used alone as paint binder. However, monoethylol urea seems to have sieved itself out as a compromise candidate who is neither brittle nor too soft. A comparison of monoethylol urea with some physical properties of some convectional paint binders present it as a potential binder which may be used in the coating industry.

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Hybrid polymer networks of unsaturated polyester–urethane as composite matrices for jute reinforcement

Singh

Gupta

Randhawa

et al. 2011

J of Applied Polymer Sci

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Reactions of unsaturated polyester resin and 4,4 0 diphenyl methane diisocyanate were carried out at different NCO/OH ratios in presence of catalysts to form the hybrid polymer networks. Chain extender (1,4 butanediol) added in the hybrid network (NCO/OH ratio: 0.76) was optimized at a level of $ 3 wt % only of the polyester resin. The curing of these networks was studied by a rigid body pendulum type (RPT) method in terms of reduced damping ratio and increased frequency. Lack of multiple glass transition temperatures, sharp Tan delta peak, and particulate composite type morphology clearly demonstrated the formation of phase mixed domains in the hybrid networks. The storage modulus and loss modulus master curves obtained by dynamic mechanical analysis indicate that hybrid polymer networks retained higher modulus at lower and intermediate frequencies over the polyester resin showing their superior time-dependent response. Efficacy of these hybrid network resins was examined as matrices in the jute composites and compared with those of polyester resin and unsaturated polyester-polyurethane interpenetrating network matrices. It is found that the hybrid polymer network matrix composites exhibited superior physicomechanical properties under both dry and boiling water age test. Fractographic evidences such as fiber-matrix adhesion, hackle markings, and fiber breakage also supported their superior behavior over other composite matrices.

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Effect of reactive polyurethane on toughness of unsaturated polyester resin

Cited by 11 publications

References 15 publications

The Research on Two-Component Materials Mixed Method for Vacuum Casting

The Research on Two-Component Materials Mixed Method for Vacuum Casting

Development of amino resins for emulsion paint formulation: effect of aldelhydic group and degree of substitution

Hybrid polymer networks of unsaturated polyester–urethane as composite matrices for jute reinforcement

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