Synthetic Resin Research Articles

Resistance of Untreated and Torrefied Medium-Density Fiberboard (MDF) Residues to Xylophage Fungi

The manufacture of wood panels generates a large amount of waste. This material can be an option for renewable energy generation. However, long-term storage, exposure to moisture and contact of these panels with the soil facilitate colonization by xylophagous organisms. Torrefaction, a heat treatment between 200 and 300 °C in an oxygen-free atmosphere, is a process that decreases hygroscopicity while increasing carbon content, energy efficiency and resistance to fungal attack. This work aimed to evaluate the resistance of MDF panel residues. The MDF panels were produced using eucalyptus wood and bonded with thermosetting synthetic resin, under high temperature and pressure, torrefied at 300 °C for 20, 30 and 40 min and exposed to the xylophagous fungi of the white rot, Irpex lacteus (Fr.) Fr. (1828) and Trametes versicolor, and that of the brown rot, Postia placenta. After the 12-week evaluation period under fungal exposure, the mass loss of the samples attacked by T. versicolor and P. placenta was similar between treatments, except the MDF untreated, which had greater mass losses from the fungus Irpex lacteus. The torrefaction process increased the material resistance to deterioration by fungi, with an inverse correlation between the torrefaction period and the mass losses by fungal attack of the MDF panel residues.

Revealing the roles of biomass components in the biosorption of heavy metals in wastewater by various chemically treated hemp stalks

BackgroundLead is a typical heavy metal contaminant that can result in severe health problems even at ultralow concentrations. Current state-of-the-art technology relies on expensive synthetic ion-exchange resins, but hemp can be an economical and ecological sustainable alternative to synthetic sorbents. In addition, the roles of various components in biomass are not clear in the biosorption process. MethodsThe various roles of biomass components in the biosorption of heavy metals were determined by investigating removing aqueous lead(II) ions by biosorbents derived from raw and chemically treated hemp stalks, such as delignification and mercerization. Various biosorbents were characterized by FTIR, SEM, and XRD to rationalize the biosorption process. Significant findingsLead(II) biosorption exhibited pseudo-second-order kinetics with intraparticle diffusion as the rate-limiting step, and the biosorption process was exothermic and favorable. Based on the biosorption capacities of various chemical-treated biosorbents, the capacities for cellulose, hemicellulose, and lignin were 277.39, 878.46, and 17.96 mg/g. Due to its hydrophilic nature and multi-functional groups, hemicellulose exhibited superior performance to commercial ion-exchange resins. Lignin is not suitable as biosorbents for removing aqueous heavy metals because of its hydrophobic property. The obtained results demonstrate the feasibility of using biosorbents derived from hemp stalks as sustainable and economical materials for wastewater treatment.

Characterization of single-mode multimode single-mode fiber optic sensors for steel rebar corrosion monitoring in NaCl and simulated concrete pore solutions

Single-mode multimode single-mode (SMS) fiber optic sensors are characterized for corrosion monitoring of steel rebars in NaCl and simulated concrete pore solutions. Three diameters of the multimode fiber (MMF) are considered including 125 µm, 90 µm, and 60 µm. Steel rebar specimens were first cast in epoxy resin and then polished to expose a rectangular section. The SMS fiber optic sensors are directly attached on the polished surface of the steel rebar and then immersed in solutions for corrosion monitoring. Two types of solution are prepared, including 3.5 wt.% NaCl solution and simulated concrete pore solutions. During the immersion tests, the corrosion evolution of the steel rebar was measured with open circuit potential and linear polarization resistance. The change of the transmission spectrum of the SMS fiber optic sensors is recorded with an optical spectra analyzer. The change of the characteristic wavelength is correlated with the corrosion-induced mass loss of the steel rebars. Results show that linear relationships are present between the corrosion-induced mass loss of the steel rebars and the shift of the characteristic wavelength of the SMS fiber optic sensors. The corrosion monitoring sensitivity of SMS fiber optic sensors increases with a decrease of the diameter of the MMF.

Comparison of migration and cumulative risk assessment of antioxidants, antioxidant degradation products, and other non-intentionally added substances from plastic food contact materials

Antioxidants are used in the production of synthetic resins to prevent oxidative degradation. However, non-intentionally added substances (NIAS) and the degradation products of antioxidants may contaminate food contact materials (FCM) and migrate into food. Herein, NIAS and antioxidant degradation products in synthetic resins and their migration into food simulants under various conditions were evaluated. Risk assessment was performed based on the toxicity reference values or with threshold of toxicological concern (TTC) approach. The antioxidant degradation products migrated mainly to fatty-food simulants, with the highest migration in isooctane, followed by n-heptane (similar to or lower than isooctane) and 95 % ethanol. Especially, the migration of 2,4-di-tert-butylphenol was high when the FCM was used for the first time under daily use conditions such as ultraviolet sterilization or heating in a pot, oven, or microwave. In addition, 36 target substances were monitored in 142 products of 18 synthetic resins. Of these, 2,4-di-tert-butylphenol was most sensitively detected. Risk assessment demonstrated that all the investigated substances were below the toxicity reference values. However, the risk associated with polyethylene was relatively high compared to other synthetic resins. The cumulative risks of oxidizing Irgafos 168, (z)−9-octadecenamide, tri-o-tolyl phosphite, tri-p-tolyl phosphite, and 7,9-di-tert-butyl-1-oxaspiro(4,5)deca-6,9-diene-2,8-dione using the TTC approach were calculated to range from 34.81 % to 73.74 %, suggesting that the TTC is a more conservative risk assessment.

Comparison of Pd- and Ru-Containing Composites in the Process of Selective Reduction of Furfural

A wide range of important chemicals derived from biomass, including furfural, 5-hydroxymethylfurfural, levulinic acid, glycerin, etc., are obtained in large quantities from agricultural waste (cellulose and hemicellulose). Among them, furfural derived from C5or C6 sugars is considered one of the top 30 platform chemicals derived from biomass. The reduction of furfural to furfuryl alcohol can be used to produce a variety of chemicals, including synthetic fibers, resins, foundry binders, binders, and other important platform molecules. Obtaining furfuryl alcohol using the selective reduction of furfural is a complex multi-stage process. The hydrogenation reaction of furfural has recently been carried out on composites based on Group VIII metals (Ru, Rh, Pd, Os, Ir, Pt). Therefore, a comparison was made of the catalytic properties of the 3%Pd/Al2O3and 3%Ru/Al2O3 composites using the selective reduction of furfural to furfuryl alcohol. For a better understanding of the catalytic properties of both composites, the surface and porosity of the catalysts synthesized on its basis were determined by the BET method. For a qualitative analysis of isotherms, the Brunauer classification of isotherms is used, which is based on the relationship between the isotherm shape and the adsorption mechanism. Therefore, comparison of the experimentally obtained data with the shape of the isotherm of this classification allows us to make an assumption about the adsorption mechanism and the pore size in the material under study.

Effects of styrene monomer on a mouse model of atopic dermatitis

Aim: Styrene monomer (SM) is a basic chemical used as a raw material for polystyrene and unsaturated polyester resins and in the production of synthetic resins, synthetic rubbers, paints, and adhesives. To date, it is unclear whether SM is associated with the aggravation of atopic dermatitis. The aim was to investigate the effects of SM on atopic dermatitis-like skin lesions induced by mite allergen in NC/Nga mice. Methods: Male mice were injected intradermally with mite allergen on their right ears. In the presence of an allergen, SM (3.5 or 350 μg/animal/week) was administered by intraperitoneal injection. We evaluated clinical scores, ear thickening, histologic findings, and the protein expressions of cytokines and chemokines. Results: Macroscopic and microscopic examinations demonstrated that exposure to SM at a dose of 3.5 μg caused an exacerbation of atopic dermatitis-like skin lesions related to mite allergen. These changes were consistent with the level of histamine in the ear tissue as an overall trend. In contrast, 350-μg SM did not show significant enhancement effects. Conclusion: These results indicate that SM exacerbated atopic dermatitis-like skin lesions at hundred-fold lower levels than the level that causes no observed adverse effects as determined by histologic changes in rodent livers. SM could be at least partly responsible for the recent increase in atopic dermatitis. Impact statement Styrene monomer (SM) is classified as an International Agency for Research on Cancer group 2B carcinogen and includes neurotoxicity and respiratory disorders. However, the effects of SM as a chemical substance on existing allergic pathophysiology have not been elucidated yet. This study demonstrated that SM exacerbated murine atopic dermatitis-like skin lesions at hundred-fold lower levels than the level that causes no observed adverse effects as determined by histologic changes in rodent livers, which was concomitant with the local level of histamine. These data hasten a need for comprehensive research to clarify the chemical pollutants’ effects of doses much lower than NOAEL on vulnerable pathophysiologies such as allergy/atopy.

Life Cycle Environmental Impact Assessment and Applicability of Synthetic Resin Formwork.

In this study, the environmental impacts of the production and field application of synthetic resin formwork were quantitatively compared to the Euro form. The noise test results showed an average of 107.3 dB (A) for the Euro form and 99.7 dB (A) for the synthetic resin formwork. Additionally, when the number of uses was considered, the CO2 emissions from the synthetic resin formwork were approximately 32% lower than the Euro form. Based on these results, it is expected that the use of synthetic resin formwork will reduce material production by half and reduce CO2 emissions compared to channel formwork.

Alkyd resins produced from bio-based resources for more sustainable and environmentally friendly coating applications.

Recently, due to the depletion of natural resources and raising environmental and economic concerns regarding petroleum derivatives, the creation of novel ecologically friendly and sustainable materials made from bio-based and renewable resources is gaining popularity. Alkyd resins are synthetic resins in which both renewable (fatty acids, glycerol, oil, etc.) and nonrenewable (maleic anhydride, pentaerythritol, phthalic anhydride, etc.) raw materials are used in their production. Due to their superior performance (good aging, greater weather resistance and high heat resistance, outstanding gloss, etc.) over other resins, easy application, low cost, and varied use, in the coating and paint industries, they are commonly used. This review covers the studies on bio-based monomers used instead of nonrenewable ones in the production of alkyds. The effects of substituted bio-based monomers on the final properties (adhesiveness, drying times, hardness, tackiness, etc.) of produced alkyds and coatings are also discussed in detail.

ПЕРСПЕКТИВНЫЕ СОРБЕНТЫ ДЛЯ ИЗВЛЕЧЕНИЯ НИКЕЛЯ И КОБАЛЬТА В ГИДРОМЕТАЛЛУРГИЧЕСКОЙ ПЕРЕРАБОТКЕ НИКЕЛЕВЫХ РУД

The paper provides a critical analysis of the sources, a generalization of the factual and theoretical material on the properties, the use of natural and synthetic sorbents for the extraction of nickel and cobalt from productive solutions after the leaching of nickel ores. Comparison of promising sorbents in terms of efficiency of their use with sorbents used in industry has been carried out. Sorption processes using natural substances or synthetic resins contribute to the selective extraction of nickel and cobalt from aqueous solutions. Zeolites modified with various functional groups are very promising materials for selective recovery. The ability to selectively extract metal cations and the possibility of regeneration makes ion-exchange polymer resins one of the leading sorbents in the modern world. The polymer resin sorption process avoids wastage of reagents, costly filtration, and poor selectivity for nickel and cobalt over other metal ions associated with solvent extraction processes. A comparison of the values of the sorption capacities of natural sorbents shows the promise of using silicate minerals - montmorillonite and palygorskite in industry, as well as the development of technological processes using them. Analysis of the recovery rates of synthetic polymer resins proves the frequent use of Amberlite, Dowex and Ionac in the industry. However, Dowex M4195 has the highest nickel selectivity due to the presence of a bis-picolylamine functional group, unlike other resins with an iminodiacetate group. In addition, the disadvantage of foreign-made chelate resins is their high cost, which cannot be said about the cation exchanger grade KU 2-8 of a Russian manufacturer.

Research Progress of Tung Oil/UV Photocomposite Curing Material

Tung oil (TO)/ultraviolet (UV) photo-composite curing material possesses the characteristics of low curing temperature, low material shrinkage and low environmental pollution. Accordingly, this material must be developed and utilized with the conjugated double bonds contained in the long chain of the main structure (α-tung acid) molecules in the refined TO. The aforementioned material can be chemically modified using a variety of chemical methods to develop a new TO-based UV photocurable material due to its unique chemical properties. This work reviews the research progress of TO/UV photo-composite curing materials in recent years. Firstly, the chemical structure and application of TO and UV Photocatalysis Technology were briefly introduced. Secondly, the research status of novel TO/UV photo-composite curing materials developed by the Diels-Alder reaction was discussed. The method and curing effect of the UV curing system constructed by other chemically modified TO were also discussed. Thereafter, the application of TO in industrial production is introduced from four directions: the application of TO in biodiesel, the application in synthetic resin, the application in self-healing coating and microcapsules and other applications. Finally, the research and application prospects of TO/UV photo-composite curing materials were presented.

Application of amino-hypophosphite polyampholyte for purification of wastewater containing Ni(ii) ions.

This study investigated the sorption of Ni(ii) ions from an aqueous solution using novel, synthetic amino-hypophosphite polyampholyte resin (AHP) in a batch adsorption system. The removal of Ni(ii) ions was determined as a function of pH (2.0-8.0), initial concentration of Ni(ii) ions (2.0-20.0 mM), resin dosage (1.0-10.0 g dm-3), contact time (0.04-24 h), and temperature (298-318 K). Moreover, continuous fixed-bed column sorption was also studied using model solutions and actual wastewater from the galvanising plant. The batch sorption experimental data showed that the maximum pH for efficient Ni(ii) ion removal was about 5.0. An equilibrium was reached after about 24 hours. The kinetics results were fitted using pseudo-first-order (PFO), pseudo-second-order (PSO), liquid film (LFD), and intraparticle diffusion (IPD) models. Freundlich and Langmuir isotherm models were applied for sorption equilibrium data. The maximum sorption capacity was obtained from the Langmuir equation to be 2.39, 2.52, and 2.62 mmol g-1 at 298, 308, and 318 K, respectively. The thermodynamic parameters for the sorption of Ni(ii) ions on AHP imply the endothermic and spontaneous character of the process. The experimental results demonstrated that amino-hypophosphite polyampholyte resin could be used to effectively remove Ni(ii) ions from model solutions and real wastewater.

Электропроводящие нанокомпозиционные битумные вяжущие, содержащие углеродные нанотрубки и многослойный графен

In the modern literature, there are practically no data on the electrical characteristics of bituminous binders modified with carbon nanotubes and graphene nanoplates, while they are necessary for the design and development of innovative asphalt pavement compositions sensitive to the super-high-frequency microwave radiation. Contemporary bituminous binders are multi-component systems that may contain polymers, rubbers, synthetic or natural resins, inorganic salts, and even fragrances. As a result of application of modifying additives, bitumen acquires high performance characteristics. A special class of modifiers are micro- and nano-sized electrically conductive fibers and particles (steel wool, carbon fibers, carbon black, carbon nanotubes, graphene nanoplates), the use of which makes it possible to ensure the sensibility of bituminous binders to super-high-frequency microwave radiation and the implementation of the process of healing cracks in an asphalt pavement with its subsequent regeneration. As part of the study, the authors developed an original technique to produce bituminous binders modified with carbon nanotubes and multilayer graphene. Modified bituminous compositions in the concentration range from 0.2 to 6 and from 0.2 to 11 wt. % for multi-walled carbon nanotubes (MWCNT) and multilayer graphene nanoplates (MG), respectively were experimentally obtained. For the first time, the dependence of the specific volume electrical conductivity of bitumen-based nanocomposites on the concentration of nanostructured carbon filler (MWCNT and MG) was researched. The maximum values of electrical conductivity were 4.76×10−4 S/cm and 3.5×10−4 S/cm for nanocomposites containing 6 wt. % MWCNT and 11 wt. % MG, respectively. The study determined the filler volume fractions at the percolation threshold for nanocomposites containing MWCNT and MG. They amounted to 0.22 and 2.18, respectively. The formation of a percolation contour in nanocomposites containing MWCNT occurs at significantly lower filler concentrations compared to bituminous compositions containing MG.

Evaluation of trueness and precision of removable partial denture metal frameworks manufactured with digital technology and different materials.

The aim of this study is to evaluate the accuracy of removable partial denture (RPD) frameworks produced using different digital protocols. 80 frameworks for RPDs were produced using CAD-CAM technology and divided into four groups of twenty (n = 20): Group 1, Titanium frameworks manufactured by digital metal laser sintering (DMLS); Group 2, Co-Cr frameworks manufactured by DMLS; Group 3, Polyamide PA12 castable resin manufactured by multi-jet fusion (MJF); and Group 4, Metal (Co-Cr) casting by using lost-wax technique. After the digital acquisition, eight specific areas were selected in order to measure the Δ-error value at the intaglio surface of RPD. The minimum value required for point sampling density (0.4 mm) was derived from the sensitivity analysis. The obtained Δ-error mean value was used for comparisons: 1. between different manufacturing processes; 2. between different manufacturing techniques in the same area of interest (AOI); and 3. between different AOI of the same group. The Δ-error mean value of each group ranged between -0.002 (Ti) and 0.041 (Co-Cr) mm. The Pearson's Chi-squared test revealed significant differences considering all groups paired two by two, except for group 3 and 4. The multiple comparison test documented a significant difference for each AOI among group 1, 3, and 4. The multiple comparison test showed significant differences among almost all different AOIs of each group. All Δ-mean error values of all digital protocols for manufacturing RPD frameworks optimally fit within the clinical tolerance limit of trueness and precision.

Hydrophobized clay gypsum

Clay-gypsum binder is the main component for products and plaster coverings used in premises with dry climates. The raw material for producing clay-gypsum binder is sedimentary rock containing gypsum dihydrate and clay in an amount from5 to 30%. In order to expand the range and possibility of using clay-gypsum binder, it is hydrophobized by introducing synthetic resins. The purpose of the research presented in the article is to study the possibilities of increasing the softening coefficient of clay-gypsum binder by introducing thermosetting resins. As a result of the experiment, based on the methods of mathematical planning and statistical processing, a methodology for selecting the composition of the clay-gypsum binder was developed and the optimal content of thehydrophobing agentin the binder was determined.

A 90-day dose toxicity study of 2-(2H-benzotriazol-2-yl)-6-dodecyl-4-methylphenol in rats

2-(2H-benzotriazol-2-yl)-6-dodecyl-4-methylphenol (BTMLP, CAS No. 125304-04-3) is widely used as a liquid ultraviolet absorber that prevents deterioration of synthetic resins and so on. To investigate its toxicological properties and determine the no-observed-adverse-effect level (NOAEL), a 90-day repeated oral toxicological study of BTMLP was conducted in Crl:CD (SD) rats at doses of 0 (vehicle control, corn oil), 100, 300, and 1000 mg/kg/day. There was no observed mortality or abnormal clinical signs related to the treatment of any group. Body weight and food consumption were not affected by BTMLP treatment. In males, significant prolongations of prothrombin time and activated partial thrombin time were observed in the BTMLP-treated groups. Histopathological examination revealed a slight increase of the eosinophilic bodies and hyaline droplets in the renal cortical tubules in the 1000 mg/kg group in males. As mentioned above, the toxic effect of the BTMLP was noted in the blood coagulation system and kidneys only in males. Based on these findings, the NOAEL was judged to be less than 100 mg/kg/day in males and 1000 mg/kg/day in females under this study’s condition.

THE EMERGENCE AND DEVELOPMENT OF A CRACK IN THE CONCRETE OF THE ABUTMENT OF THE LOWER HEAD OF LOCK № 2 OF THE VOLGA-BALTIC WATERWAY

An analysis of the concrete structures state of the lower head of lock № 2 of the Belousovsky hydroelectric complex of the Volga-Baltic waterway is presented. In 1985, a crack was discovered in the concrete of the left abutment of the lock lower head. Observations for the dynamics of its development have showed that the crack size increases with time. To explain the causes of the crack occurrence and development, an analysis of concrete quality of the lower head structures is made according to the data of previous studies. Taking into account the technology of concreting during the construction process, as well as studies carried out during operation, the low quality of concrete and its heterogeneous structure have been stated. The analysis of the soils structure at the base of the lower head is carried out; the filtration regime of groundwater movement is considered. It is noted that the base soils are represented by fine-grained sands with an interlayer of loams. The presence of several aquifers in the basement soils, as well as the formation of the pressure front of the hydroelectric complex, led to significant gradients of the filtration flow. This contributed to the development of suffusion processes in the soils of the lower head base, which led to the formation of a decompacted layer in the roof of the rocks of the lower head base. The data of modern surveys of soil characteristics confirm that suffusion processes continue at the present time. This led to the occurrence of multidirectional settlement of the right and left abutments of the lower head, which, in turn, led to the development of the crack in the concrete mass. The measures taken to eliminate or stabilize the development of the crack, namely, pumping a cement-sand mixture into the soil, grouting the abutment concrete, anchoring the structure, injecting the concrete mass with a two-component synthetic resin, have not stopped the crack opening, because the main reasons such as the poor quality of concrete and the weak bearing capacity of the underlying soils of the base had not been eliminated.

Sustainable and Bio-Based Coatings as Actual or Potential Treatments to Protect and Preserve Concrete

The durability of reinforced concrete strongly depends on the environment in which it is located; in any case, the concrete and the reinforcing bars it contains are constantly subject to slow deterioration processes. The protection of concrete structures is, therefore, essential to increase their service life, reducing the costs for their repair and maintenance. The commercial widely used coatings are mainly based on petroleum derivatives (i.e., resins, solvents): increased sensitivity and attention to human health and the protection of the environment pressed research to find alternatives to synthetic products, identifying safer materials with a low environmental impact to employ as protective coatings. In this review, new sustainable products already used or potentially suitable to act as protective treatments for concrete were analyzed and presented. These are natural (bio-based) or waste materials, in which the use of synthetic resins and hazardous solvents, for humans and the environment, are minimized, exploiting waste materials or by-products of other processes, if possible. The main properties and characteristics of these new products are illustrated, highlighting the potential advantages over commercial products also in terms of performance.

Evaluation of the interactions of typical wood extracts on the bonding performance of soybean-based adhesives

The substitution of environmentally friendly, renewable soybean-based adhesives (SBAs) for formaldehyde-based synthetic resins to produce formaldehyde-free wood composites is of great significance for resource recycling and environmental protection. However, SBA-bonded wood composites often exhibit great variations in bonding properties, due to the diverse interactions of the extractive components in wood. In this study, the extracts of four typical commercial fast-growing timbers were isolated, and their effects on the structures and properties of the SBAs were systematically investigated using FTIR, NMR, TGA, contact angle, buffer capacity, sol–gel test, and plywood evaluation. The analytical data indicated that some of the wood extracts could cause important effects on the bonding properties of the SBAs by impacting the PAE cross-linking capacity and unfolding degree of the globular soybean proteins. Fast-growing hardwood extracts from poplar and eucalyptus timbers containing active groups resulted in increased cross-linking density and improved water resistance of the SBAs. Meanwhile, fast-growing softwood extracts from Chinese fir and Scotch pine containing inert hydrophobic components had slight impacts on PAE cross-linking, but resulted in the agglomeration of unfolded soybean proteins. This formed a weak boundary layer on the wood surface, causing a significant decrease in the water resistance of the SBAs by >35%. These findings presented available analytic approaches of wood extract–SBA interactions and useful guidance for the proper applications of SBAs in the commercial production of wood composites.

Renewable Furan-Based Epoxy Resins Derived from 5-Hydroxymethylfurfural and Furfural

The rapid depletion of oil reserves has intensified interest in research on the preparation of biobased polymers derived from renewable resources. Among biomass-based platform chemicals, furan-based compounds are a suitable replacement for petro-sourced chemicals because of their aromatic characteristics and sustainability. In this work, we report a mild and scalable synthesis of two types of furan-based diepoxide monomers from readily available 5-hydroxymethylfurfural (HMF) and furfural. Various diamines were employed as the curing agents, and a series of biobased epoxy/amine systems was subsequently prepared. Evaluation of thermal and mechanical performance of the cured epoxy resins demonstrated that synthetic furan-based epoxy resins have the potential to complement current phenyl-based polymer materials.

Fully Bio-Based Adhesive from Tannin and Sucrose for Plywood Manufacturing with High Performances.

Fully bio-based adhesives are beneficial to reduce the dependence of the wood adhesive industry on synthetic resins based on petrochemical resources and enhance the market competitiveness of adhesives. A fully bio-based wood adhesive composed of tannin and sucrose was developed and successfully used in the preparation of plywood. Effects of the preparation technology on the bonding strength and water resistance of plywood were investigated, and the properties of the adhesive were analyzed by Fourier transform infrared spectroscopy (FT-IR), thermogravimetry (TG) and X-ray diffraction (XRD) in this study. The results showed that: (1) Compared with other biomass adhesives, tannin-sucrose adhesive had the characteristics of high-solid content and low viscosity, which had the potential to prepare particleboard and fiberboard. (2) A proper mass ratio of tannin to sucrose was key to obtaining a tannin-sucrose adhesive with better properties. (3) The optimum preparation process of tannin-sucrose adhesive for plywood was as follows: hot-pressing temperature of 210 °C, hot-pressing time of 1.2 min/mm, m(tannin):m(sucrose) of 60:40 and adhesive loading of 160 g/m2. Under these conditions, the water-resistant bonding strength of the plywood was 0.89 MPa, which met the strength requirements of the Type II standard of plywood in GB/T 17657-2013. (4) The hot-pressing temperature played a decisive role in the tannin-sucrose adhesive, and the good performance of the plywood was maintained when the temperature was 210 °C or above. Thus, the prepared tannin-sucrose adhesive had high-bonding strength, good water resistance and thermal stability.