Improved water resistance in undecylenic acid (UA)-modified soy protein isolate (SPI)-based adhesives

2015 ◽  
Vol 74 ◽  
pp. 577-584 ◽  
Author(s):  
Haijing Liu ◽  
Cong Li ◽  
Xiuzhi Susan Sun
Keyword(s):  
Soy Protein ◽  
Water Resistance ◽  
Soy Protein Isolate ◽  
Protein Isolate ◽  
Undecylenic Acid

Preparation and its Properties of the Urea Modified Soy Protein Isolate Adhesives

2012 ◽  
Vol 580 ◽  
pp. 481-484 ◽  
Author(s):  
Jian Jun Xie ◽  
Na Li ◽  
Nian Zeng
Keyword(s):  
Soy Protein ◽  
Water Resistance ◽  
Guanidine Hydrochloride ◽  
Soy Protein Isolate ◽  
Environmentally Friendly ◽  
Protein Isolate ◽  
Resource Scarcity ◽  
Molecular Chain ◽  
Hydrophobic Group ◽  
Optimum Formula

Soy proteins have shown great potential for use as renewable and environmentally friendly adhesives. The orthogonal experiments are designed for the urea-modified soy protein isolate(SPI) adhesives and the optimum formula is obtained. The mass concentrations of SPI and urea are 14% and 8%(relative to the total mass of SPI and water), the reaction temperature and time are 35°C and 60 min, respectively. Some basic and adhesion properties and its structure of the modified SPI adhesive for the optimum formula are measured. The viscosity is 43Pa.s, and the dry- and wet-state adhesion strengths of the urea-modified SPI optimum formula are 0.96MPa and 0.78MPa(>0.72MPa), respectively according to GB/T10724-2006, which satisfied with the requirement of the II-type plywood. Its surface hydrophobicity is improved and the thermal properties is slightly improved after 200°C. Recently, some concerns about environmental pollution, resource scarcity, and related health issues have pushed scientists to replace the petrochemicals-based synthetic polymers, which are used extensively in construction, packaging, glue and plywood industries, with the bio-based adhesives. SPI adhesives have shown great potential for use as environmentally friendly adhesives in plywood since 1930s when it’s first be developed. And it has been modified by chemical alkali[1], sodium dodecyl sulfate(SDS)[2,3], and urea[2], guanidine hydrochloride[4], etc. However, most of these modifications can not very well improve the water resistance and the bonding strength separately. Poor water resistance is a fatal weakness which seriously restricts the application in the industry. Many studies[5~8] have shown that the adhesives with some enhanced performances, for example, adhesion strength and water-resistant, can be obtained by unloading SPI molecular chain with the hydrophobic group using urea, SDS, other surfactant and guanidine hydrochloride, etc. And the unloading mechanism of the SPI molecular chain with the hydrophobic group is proclaimed. The optimum concentration of urea is 1mol/L for the water-resistant. The aim of this research was to improve the tacky strength and the water resistance[9] by using urea to modify SPI and evaluate the resulting adhesive’s potential for use in the plywood.

Bio-based films with improved water resistance derived from soy protein isolate and stearic acid via bioconjugation

2019 ◽  
Vol 214 ◽  
pp. 125-131 ◽  
Author(s):  
Qianqian Ye ◽  
Yufei Han ◽  
Jizhi Zhang ◽  
Wei Zhang ◽  
Changlei Xia ◽  
...  
Keyword(s):  
Stearic Acid ◽  
Soy Protein ◽  
Water Resistance ◽  
Soy Protein Isolate ◽  
Protein Isolate

Properties of the Soy Protein Isolate/PVAc Latex Blend Adhesives

2012 ◽  
Vol 550-553 ◽  
pp. 1103-1107 ◽  
Author(s):  
Nian Zeng ◽  
Jian Jun Xie ◽  
Chu Ding
Keyword(s):  
Soy Protein ◽  
Total Mass ◽  
Mass Concentration ◽  
Water Resistance ◽  
Soy Protein Isolate ◽  
Influence Factors ◽  
Protein Isolate ◽  
Infrared Spectrometry ◽  
Fourier Transform Infrared Spectrometry ◽  
Soybean Proteins

Soybean proteins have shown great potential for use as renewable, environmentally friendly adhesives. In this research, poly(vinyl acetate)(PVAc) latex and some auxiliary agent were used to modify soy protein isolate(SPI). The chemical microstructure of the adhesives was obtained by means of Fourier transform infrared spectrometry (FTIR). The influence factors of the bonding strength and the water resistance of SPI adhesive were studied by different mass ratios of the SPI and PVAc latex, the blending time and the crosslink time. A better synthesis condition is as follow, the mass concentration of SPI is 13%; the mass concentrations of urea, PVAc latex and the crosslinker is 6%, 11.1% and 1.5%, respectively(relative to the total mass of SPI and water), and the crosslink time is 1.5h. The thermal properties are studied and the mechanism is discussed.

scholarly journals High-Performance Soy Protein Isolate-Based Film Synergistically Enhanced by Waterborne Epoxy and Mussel-Inspired Poly(dopamine)-Decorated Silk Fiber

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1536
Author(s):  
Pang ◽  
Zhao ◽  
Qin ◽  
Zhang ◽  
Li
Keyword(s):  
Soy Protein ◽  
High Performance ◽  
Food Packaging ◽  
Water Resistance ◽  
Soy Protein Isolate ◽  
Protein Isolate ◽  
Food Preservation ◽  
Silk Fiber ◽  
13C Nuclear Magnetic Resonance ◽  
Waterborne Epoxy

It remains a great challenge to fabricate bio-based soy protein isolate (SPI) composite film with both favorable water resistance and excellent mechanical performance. In this study, waterborne epoxy emulsions (WEU), which are low-cost epoxy crosslinkers, together with mussel-inspired dopamine-decorated silk fiber (PSF), were used to synergistically improve the water resistance and mechanical properties of SPI-based film. A stable crosslinking network was generated in SPI-based films via multiple physical and chemical combinations of WEU, PSF, and soy protein matrixes, and was confirmed by attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy, X-ray diffraction (XRD), and solid state 13C nuclear magnetic resonance (13C NMR). As expected, remarkable improvement in both water resistance and Young’s modulus (up to 370%) was simultaneously achieved in SPI-based film. The fabricated SPI-based film also exhibited favorable thermostability. This study could provide a simple and environmentally friendly approach to fabricate high-performance SPI-based film composites in food packaging, food preservation, and additive carrier fields.

Effect of Salicylic Acid on the Mechanical Properties and Water Resistance of Soy Protein Isolate Films

2010 ◽  
Vol 18 (4) ◽  
pp. 197-203 ◽  
Author(s):  
Huiyu Bai ◽  
Rakesh Kumar ◽  
Cheng Yang ◽  
Xiaoya Liu ◽  
Lina Zhang
Keyword(s):  
Mechanical Properties ◽  
Salicylic Acid ◽  
Soy Protein ◽  
Water Resistance ◽  
Soy Protein Isolate ◽  
Protein Isolate

scholarly journals Rheology and Water Absorption Properties of Alginate–Soy Protein Composites

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1807
Author(s):  
Estefanía Álvarez-Castillo ◽  
José Manuel Aguilar ◽  
Carlos Bengoechea ◽  
María Luisa López-Castejón ◽  
Antonio Guerrero
Keyword(s):  
Soy Protein ◽  
Water Solubility ◽  
Divalent Cations ◽  
Low Cost ◽  
Soy Protein Isolate ◽  
Protein Isolate ◽  
Guluronic Acid ◽  
Wide Range ◽  
Anionic Polysaccharides ◽  
Porous Matrices

Composite materials based on proteins and carbohydrates normally offer improved water solubility, biodegradability, and biocompatibility, which make them attractive for a wide range of applications. Soy protein isolate (SPI) has shown superabsorbent properties that are useful in fields such as agriculture. Alginate salts (ALG) are linear anionic polysaccharides obtained at a low cost from brown algae, displaying a good enough biocompatibility to be considered for medical applications. As alginates are quite hydrophilic, the exchange of ions from guluronic acid present in its molecular structure with divalent cations, particularly Ca2+, may induce its gelation, which would inhibit its solubilization in water. Both biopolymers SPI and ALG were used to produce composites through injection moulding using glycerol (Gly) as a plasticizer. Different biopolymer/plasticizer ratios were employed, and the SPI/ALG ratio within the biopolymer fraction was also varied. Furthermore, composites were immersed in different CaCl2 solutions to inhibit the amount of soluble matter loss and to enhance the mechanical properties of the resulting porous matrices. The main goal of the present work was the development and characterization of green porous matrices with inhibited solubility thanks to the gelation of alginate.

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