Rigid polyisocyanurate–waterglass foam composite: Preparation, mechanism, and thermal and flame‐retardant properties

Feng, Guodong; Hu, Lihong; Ma, Yufeng; Zhang, Meng; Liu, Cheng‐Guo; Zhou, Yonghong

doi:10.1002/app.46182

Cited by 4 publications

(3 citation statements)

References 33 publications

(37 reference statements)

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“…Feng et al used water glass to prepare polyisocyanurate-WG materials; the strength increased up to 0.16 MPa and the reaction temperature was lower than pure PU [15]. Zhang et al composed a novel PU modified with epoxy resin via copolymerization between polyurethane prepolymer (PUP) trimer and epoxy resin (E-44) [16]. However, these studies mainly focused on improving the performance of grouting materials, and no reports have focused on reducing heat release.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance Enhancements of Low-Heat-Releasing Polyurethane Grouting Materials with Epoxy Resin and Water Glass

et al. 2022

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Polyurethane (PU) grouting materials possess excellent fluidity and strong injectability. However, the high heat release during the reaction process restricts its application. In this study, with the addition of water glass (WG), a prepolymer was prepared by epoxy resin reacted with isocyanate to form modified polyurethane. The effects of epoxy resin and water glass on the compressive properties, expansion rate, structure of the cell, and maximum reaction temperature of the grouting materials were also investigated. The results showed that the cell size of modified PU was smaller and more regular, the maximum reaction temperature of the modified PU was reduced to 89 °C, and the compressive strength and expansion rate went up to 0.27 MPa and 57, respectively. This investigation will expand the application of PU grouting materials in underground engineering.

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Section: Introductionmentioning

confidence: 99%

Preparation and Performance Enhancements of Low-Heat-Releasing Polyurethane Grouting Materials with Epoxy Resin and Water Glass

et al. 2022

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“…Due to its non-toxicity and high stability, WG has been used for producing glasses, ceramics, corrosion inhibitors, cleaning agents, molds, cement, and so on. 20,21 Traditionally, WG was prepared by melting the mixture of Na 2 CO 3 and SiO 2 at about 1674 K, followed by dissolving the liquid melt in water. 22,23 This traditional method has two drawbacks.…”

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confidence: 99%

Water glass derived catalyst for the synthesis of glycerol carbonate via the transesterification reaction between glycerol and dimethyl carbonate

Wang

Okoye

et al. 2019

JSCS

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Water glasses with different modulus (mole ratio of SiO 2 to Na 2 O) were applied as a raw material to prepare five solid base catalysts for the synthesis of glycerol carbonate (GC) by the transesterification reaction between glycerol and dimethyl carbonate (DMC). The structure and properties of the five water glass-derived catalysts were investigated by XRD, FT-IR, FESEM, BET and acid-base titration methods. The catalysts with relatively low modulus, including 1.0, 1.5 and 2.0, presented good catalytic abilities, among which the catalyst derived from water glass with 2.0 modulus (WG-2.0) was chosen as the optimal catalyst in the synthesis of GC. This was because WG--2.0 showed the highest BET surface area, relatively high total basicity, and needed a less amount of NaOH during the preparation process. In the optimization experiments, this catalyst exhibited good catalytic ability with the glycerol conversion of 96.3 % and GC yield of 94.1 % under the condition of glycerol to DMC mole ratio of 1:4, WG-2.0 amount of 4 wt. %, reaction temperature of 348 K and reaction time of 90 min. Furthermore, the reusability experiment of WG-2.0 was also conducted and the results indicated that WG--2.0 could be reused five times without significant reduction in its catalytic ability.

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“…In 2018, Feng and coworkers [26] studied rigid polyisocyanurate-waterglass foam (PIWGRF) which was blown by water and used 2,4,6-tris(dimethylaminomethyl)phenol as catalyst and without polyol. PIWGRF was prepared by polyaryl poly(methyene isocyanate) and waterglass (WG).…”

Section: Literature Reviewsmentioning

confidence: 99%

Polyisocyanurate foams preparation catalyzed by mixtures of copper-amine complexes/potassium 2-ethylhexanoate

Suwannawet

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In this research, a new catalyst system for the preparation of polyisocyanurate (PIR) foam was developed. The mixture of copper-amine complex:potassium 2-ethylhexanoate (K-15) and metal-ethanolamine complex:K-15 were used as catalysts. Two copper-amine complexes and two metal-ethanolamine complexes, namely Cu(OAc)2(en)2, Cu(OAc)2(trien), Cu(OAc)2(EA)2 and Zn(OAc)2(EA)2, respectively; where en = ethylene diamine, trien = triethylenetetramine and EA = ethanolamine, were used as catalyst for blowing and gelling reactions. K-15 was used as a catalyst for trimerization reaction. These catalysts could be further used in the preparation of PIR forms without purification. Characterization of catalysts were done by using UV-visible spectroscopy. The factors investigated in the preparation of PIR foams were reaction times, foam density, NCO conversion, rise profile, temperature profile, compressive strength and morphology. PIR foams catalyzed by copper-amine complex:K-15 and metal-ethanolamine complex:K-15 were compared with those prepared from a commercial catalyst system, N,N?-dimethylcyclohexylamine (DMCHA):K-15. The experimental results showed that Cu(OAc)2(en)2:K-15, Cu(OAc)2(trien):K-15, Cu(OAc)2(EA)2:K-15 and Zn(OAc)2(EA)2:K-15 had better gelling catalytic activity than DMCHA:K-15. The ratio of catalyst:K-15 = 0.5:3 and the amount of water = 5 pbw are suitable for preparation of PIR foam.

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Rigid polyisocyanurate–waterglass foam composite: Preparation, mechanism, and thermal and flame‐retardant properties

Cited by 4 publications

References 33 publications

Preparation and Performance Enhancements of Low-Heat-Releasing Polyurethane Grouting Materials with Epoxy Resin and Water Glass

Preparation and Performance Enhancements of Low-Heat-Releasing Polyurethane Grouting Materials with Epoxy Resin and Water Glass

Water glass derived catalyst for the synthesis of glycerol carbonate via the transesterification reaction between glycerol and dimethyl carbonate

Polyisocyanurate foams preparation catalyzed by mixtures of copper-amine complexes/potassium 2-ethylhexanoate

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