Multifunctional β-amino alcohols as bio-based amine curing agents for the isocyanate- and phosgene-free synthesis of 100% bio-based polyhydroxyurethane thermosets

2016 ◽  
Vol 18 (8) ◽  
pp. 2406-2415 ◽  
Author(s):  
H. Blattmann ◽  
R. Mülhaupt
Keyword(s):  
Epoxy Resin ◽  
Amino Alcohols ◽  
Cyclic Carbonate ◽  
Raw Material ◽  
Curing Agents ◽  
Amine Curing

Novel 100% bio-based NIPU thermosets by employing bio-based epoxy resin feedstocks as raw material for cyclic carbonate monomers and amine curing agents.

scholarly journals Tailoring Epoxy Resin Foams by Pre-Curing with Neat Amine Hardeners and Its Derived Carbamates

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1348
Author(s):  
Christian Bethke ◽  
Sebastian Manfred Goller ◽  
Uy Lan Du Ngoc ◽  
Simon Tino Kaysser ◽  
Volker Altstädt ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
High Performance ◽  
Cell Structure ◽  
Dual Function ◽  
Curing Time ◽  
Blend Ratio ◽  
Homogeneous Cell ◽  
Curing Agents ◽  
Amine Curing ◽  
Blend Ratios

The use of amine-based carbamates with their dual function, acting as amine curing agents and CO2 blowing agents after their decomposition without by-products, are promising for ecofriendly epoxy foams as high-performance materials. However, controlling cell morphology requires a proper adjustment of the viscosity at the foaming step. The viscosity is altered not only by blending neat amine and its derived carbamate at a fixed pre-curing time, but also by changing the pre-curing time at a fixed blend ratio. Within this study, diglycidylether of bisphenol A (DGEBA) epoxy resin is mixed with different blend ratios of isophorone diamine (IPDA) and its derived carbamate (B-IPDA). The systems are characterized by DSC and rheology experiments to identify the pre-curing effects on the derived epoxy foams. Epoxy foams at a blend ratio of 30/70w IPDA/B-IPDA showed the best foam morphology and an optimum Tg compared to other blend ratios. Furthermore, it was found that both pre-curing times, 2 h and 3 h, for the 30/70w IPDA/B-IPDA system reveal a more homogeneous cell structure. The study proves that the blending of neat amine and carbamate is beneficial for the foaming performance of carbamate systems.

scholarly journals Influence of epoxy resin curing systems and aluminium surface modification on selected properties of adhesive joints

2018 ◽  
Vol 20 (4) ◽  
pp. 26-31
Author(s):  
Małgorzata Szymiczek ◽  
Błażej Chmielnicki
Keyword(s):  
Surface Modification ◽  
Epoxy Resin ◽  
Adhesive Joints ◽  
Matrix Composites ◽  
Cycle Number ◽  
Lap Shear ◽  
Curing Agents ◽  
Amine Curing ◽  
Resin Curing ◽  
Composite Samples

Abstract The aim of the present study was to investigate the effect of epoxy resin curing agents and aluminium surface modification on the properties of adhesive joints which were subjected to aging under thermal shock conditions. Composites containing reinforced aramid and carbon fibres with aluminium flat profiles (alloy Al 5754) were tested under shear conditions. Epoxy resin (Araldite LY 1564) with amine curing agents (Aradur 3486, Aradur 3487 and Aradur 3405) was used as a matrix. Composites were made using vacuum-assisted contact lamination. The degree of degradation was assessed on the basis of lap shear strength of adhesive joints in accordance with EN ISO 1465:2009. The research showed that epoxy composite samples based on Aradur 3405 (accelerated aliphatic polyamine) and sanded surface of aluminium presented the best lap shear adhesive strength, because this composite has the largest roughness. The hardness of the used adhesive is slightly increased with the cycle number.

Epoxy Resin Based Polyamides as Epoxy Curing Agents

1997 ◽  
Vol 36 (3-4) ◽  
pp. 189-196 ◽  
Author(s):  
Rajesh Baraiya ◽  
Jatin R. Thakkar
Keyword(s):  
Epoxy Resin ◽  
Epoxy Curing ◽  
Curing Agents

Critical transition of epoxy resin from brittleness to toughness by incorporating CO2-sourced cyclic carbonate

2018 ◽  
Vol 26 ◽  
pp. 302-313 ◽  
Author(s):  
Jiexi Ke ◽  
Xiaoyun Li ◽  
Shuai Jiang ◽  
Junwei Wang ◽  
Maoqing Kang ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Cyclic Carbonate ◽  
Critical Transition

scholarly journals The application of a phosphorus nitrogen flame retardant curing agent in epoxy resin

e-Polymers ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 545-554 ◽  
Author(s):  
Anxin Li ◽  
Pingli Mao ◽  
Bing Liang
Keyword(s):  
Flame Retardant ◽  
Epoxy Resin ◽  
Adhesive Strength ◽  
Chemical Structure ◽  
Phosphorus Content ◽  
Raw Material ◽  
Curing Agent ◽  
Thermal Degradation Behavior ◽  
Overall Performance ◽  
The Impact

AbstractIn order to improve the compatibility of flame retardant and epoxy resin, a phosphorus nitrogen flame retardant curing agent poly(p-xylylenediamine spirocyclic pentaerythritol bisphosphonate) (PPXSPB) was synthesized. FTIR, 1HNMR, and mass spectroscopy were used to identify the chemical structure of PPXSPB. Epoxy resin (E-44) and PPXSPB as the raw material, a series of thermosetting systems were prepared. The effects of PPXSPB on flame retardancy, water resistance, thermal degradation behavior, mechanical properties and the adhesive strength of EP/PPXSPB thermosets were investigated. The results show that with the increase of phosphorus content, the oxygen index and carbon residue of the system both increased significantly, and the heat release rate gradually decreased, which is of great significance in delaying the occurrence of fire. When the phosphorus content is 3.24% in EP/PPXSPB thermosets, EP-2 can successfully pass the UL94 V-0 flammability rating, the LOI value of EP-2 can reach 31.4%, the impact strength and tensile strength was 6.58 kJ/m2 and 47.10 MPa respectively, and the adhesive strength was 13.79 MPa, the system presents a good overall performance.

scholarly journals Epoxy resin filled with primary and secondary raw material – useable in agriculture

2014 ◽  
Vol 60 (No. 4) ◽  
pp. 165-171 ◽  
Author(s):  
P. Valášek ◽  
J. Kejval ◽  
M. Müller
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Epoxy Resin ◽  
Filler Particle ◽  
Polymeric Materials ◽  
Raw Material ◽  
Nano Particles ◽  
Inorganic Particles ◽  
Increase Wear Resistance ◽  
Secondary Raw Material

Hard inorganic particles in the interaction with polymeric materials increase wear resistance. Also reactoplastics are suitable for filling with micro- and nano-particles for a purpose of some mechanical properties optimization. The paper compares chosen mechanical properties – hardness, wear resistance and tensile characteristics of epoxy resin filled with artificial corundum with various middle particles sizes and their ratio combination. Mentioned systems can be used in a sphere of the agricultural production at renovation of machine parts, they can serve for creating resistant layers on machines, floors and grillages at the same time. The aim of the carried out experiment is to compare the properties of reactoplastics filled with a primary and secondary raw material and to define an optimum ratio of the filler particle size relating to a given mechanical quality. The artificial corundum was chosen as the primary material, the waste corundum from the process of material mechanical treatment was chosen as the secondary one.    

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