Preparation and characteristics of polyurethane made with polyhydric alcohol‐liquefied rice husk

Lee, Wen‐Jau; Yu, Chao-Yun; Chen, Yi-Chun

doi:10.1002/app.45910

Cited by 18 publications

(17 citation statements)

References 41 publications

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“…Castor oil and PMDI were used directly in the experiments. The acid and hydroxyl value of castor oil and PMDI of NCO% were measured by standard methods [21]. NCO% was calculated as follows: NCO content = Weight of NCO group/Weight of sample × 100.…”

Section: Methodsmentioning

confidence: 99%

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Castor Oil-Based Polyurethane Resin for Low-Density Composites with Bamboo Charcoal

Chen

Tai

2018

Polymers

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Polyurethane (PU) foam adhesives were prepared from castor oil as a polyol with isocyanate poly(4,4’-methylene diphenyl isocyanate) (PMDI) using a solvent-free process. The NCO/OH molar ratio used for the preparation of PU foams was 1.5. Water, organosiloxane and dibutyltin dilaurate were used as the blowing agent, surfactant and catalyst, respectively. The ratio of blowing agent and catalyst were adjusted to optimize the properties. The results show that PU foam prepared with 4 wt % of castor oil catalyst and blowing agent has minimal water absorption and maximal volume expansion in the PU foams. FT-IR analysis shows that a urethane bond was formed by the hydroxyl group of castor oil and the –NCO group of isocyanate PMDI. More blowing agent and catalyst could improve the volume expansion ratio and reduce water retention of PU foams. It was found that Moso bamboo charcoal (Phyllostachys pubescens) and China fir wood particle (Cunninghamia lanceolate) composites with setting densities of 500 and 600 kg/m3 can be prepared from optimized castor oil-based PU foam adhesive at 100 °C for 5 min under a pressure of 1.5 MPa. Increasing the amount of bamboo charcoal decreases the equilibrium moisture content, water absorption and internal bonding strength of the composite. Notably, bamboo charcoal composite exhibits excellent dimensional stability. The optimized density and bamboo charcoal percentages of the composite were 500 kg/m3 and 50–100%, respectively. The castor oil-based PU composites containing bamboo charcoal fulfilled the CNS 2215 standards for particleboard. This dimensionally stable, low-density bamboo charcoal composite has high potential to replace current indoor building materials.

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Section: Methodsmentioning

confidence: 99%

“…The method used for water absorption and water retention of the PU foams followed a previous study [21]. PU foam specimens of 2 × 2 × 2 cm 3 were used for density and water immersion testing.…”

Section: Methodsmentioning

confidence: 99%

Castor Oil-Based Polyurethane Resin for Low-Density Composites with Bamboo Charcoal

Chen

Tai

2018

Polymers

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“…The liquefaction method followed Lee et al (2018). Dealkaline-lignin was liquefied in the mixture of PEG/glycerol (9/1; wt/wt) with 10% HCl as a catalyst.…”

Section: Liquefaction Of Ligninmentioning

confidence: 99%

Influences of liquefied lignin content on the properties of waterborne polyurethane prepared with different chain extenders

Lee

et al. 2020

Holzforschung

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Waterborne polyurethane resins (WPUs) were prepared from polytetramethylene ether glycol (PTMG) and PTMG/polyhydric alcohol liquefied lignin (LL) with isophorone diisocyanate (IPDI), and ethylenediamine (EDA) and 1,4-butanediol (1,4-BD) were used as chain extenders. The effects of LL and the kind of chain extender on the properties of the WPU suspensions and dried films were studied. WPU suspensions prepared with PTMG/LL as the polyol had higher viscosity and larger average particle dimension than those with PTMG alone. WPU films prepared with EDA as the chain extender had higher tensile strength with less tensile deformation. LL can enhance the stiffness of WPU films, but the breaking deformation decreases. Dynamic mechanical analyzer (DMA) results showed that the main effect of LL was reduced thermal activity of the soft segment. Thermogravimetric analyzer (TGA) results showed WPU films prepared with EDA as the chain extender had better heat-resistance than those with 1,4-BD.

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“…Castor oil and PMDI were used directly in the experiments. The acid and hydroxyl value of castor oil and PMDI of NCO% were measured by standard methods [19]. Moisture content of castor oil was measured by Metrohm 703 Ti Stand.…”

Section: Properties Of Castor Oil and Pmdimentioning

confidence: 99%

“…The methods of water absorption and water retention of PU foams followed a previous study [19]. PU foam specimens with of 2 × 2 × 2 cm 3 were used for density and water immersion testing.…”

Section: Density Water Absorption and Water Retentionmentioning

confidence: 99%

Castor Oil-Based Polyurethane Resin for Low-Density Composites with Bamboo Charcoal

Chen¹,

Tai²

2018

Preprint

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Polyurethane (PU) foam adhesives were prepared from castor oil as a polyol with isocyanate poly (4,4′-methylene diphenyl isocyanate) (PMDI) using a solvent-free process. The NCO/OH molar ratio used for the preparation of PU foams was 1.5. Water, organosiloxane and dibutyltin dilaurate were blowing agent, surfactant and catalyst, respectively. Effects of the ratio of blowing agent and catalyst were adjusted to optimize the properties. The results show that 4 wt% of castor oil of catalyst and blowing agent minimizes water absorption and maximizes volume expansion in the PU foams. FT-IR analysis shows that urethane bond was formed by hydroxyl group of castor oil and –NCO group of isocyanate PMDI. More blowing agent and catalyst could improve the volume expansion ratio and reduce water retention of PU foams. It was found that Moso bamboo charcoal (Phyllostachys pubescens) or/and China fir wood particle (Cunninghamia lanceolate) composites with setting densities of 500 and 600 kg/m3 can be prepared from optimized castor oil-based PU foam adhesive at 100 °C for 5 min under a pressure of 1.5 MPa. Increasing the amount of bamboo charcoal decreases the equilibrium moisture content, water absorption and internal bonding strength of the composite. Notably, bamboo charcoal composite exhibits excellent dimensional stability. The optimized density and bamboo charcoal percentages of the composite were 500 kg/m3 and 50 to 100%. The castor oil-based PU composites containing bamboo charcoal fulfilled the CNS 2215 standards for particleboard. This dimensionally stable, low-density bamboo charcoal composite has high potential to replace current indoor building materials.

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Preparation and characteristics of polyurethane made with polyhydric alcohol‐liquefied rice husk

Cited by 18 publications

References 41 publications

Castor Oil-Based Polyurethane Resin for Low-Density Composites with Bamboo Charcoal

Castor Oil-Based Polyurethane Resin for Low-Density Composites with Bamboo Charcoal

Influences of liquefied lignin content on the properties of waterborne polyurethane prepared with different chain extenders

Castor Oil-Based Polyurethane Resin for Low-Density Composites with Bamboo Charcoal

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