TDI-IPDI Waterborne Polyurethane Emulsions: Properties and Application

2011 ◽  
Vol 233-235 ◽  
pp. 1700-1703
Author(s):  
Yu Hua Guo ◽  
Shu Cai Li ◽  
Gao Sheng Wang
Keyword(s):  
Water Resistance ◽  
Waterborne Polyurethane ◽  
Molar Ratio ◽  
Resistance Surface ◽  
Surface Sizing ◽  
Folding Endurance ◽  
End Capping ◽  
Sizing Agents ◽  
Tearing Resistance ◽  
Surface Gloss

TDI as main isocyanate, IPDI as end-capping reagent, waterborne polyurethane emulsions (WPUs) surface-sizing agent have been obtained. The properties of WPUs and papers sized by WPUs with different DMPA content, different NCO/OH molar ratio and nNCOTDI/nNCOIPDI are systematically examined. The results show that WPUs are new kinds of surface sizing agents with good properties. The water resistance, surface gloss and smoothness of papers sized by WPUs have dramatically increased. The folding endurance, tearing resistance and tensile strength of WPU sized papers are observed to increase obviously.

scholarly journals Synthesis of highly branched water-soluble polyester and its surface sizing agent strengthening mechanism

e-Polymers ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 027-037
Author(s):  
Wangwang Duan ◽  
Xiaorui Li ◽  
Yiding Shen ◽  
Kai Yang ◽  
Hua Zhang
Keyword(s):  
Mechanical Properties ◽  
Water Resistance ◽  
Cellulose Fiber ◽  
Gel Permeation Chromatography ◽  
Strengthening Mechanism ◽  
Water Soluble ◽  
Molar Ratio ◽  
Hydroxyl Groups ◽  
Surface Sizing ◽  
Sizing Agents

Abstract Solvent-free and highly branched water-soluble polyester (WPET) is prepared through self-emulsification methodology, using dimethyl terephthalate (DMT), sodium dimethyl isophthalate-5-sulfonate (SIPM), trimethylolpropane (TMP), and ethylene glycol (EG) by the transesterification and polycondensation. The WPET were first utilized as surface-sizing agents for cellulose fiber paper. The structure, average molecular weights, and physical properties of the water-soluble polyester were characterized by FTIR, 1H NMR, gel permeation chromatography (GPC), dynamic light scattering (DLS), X-ray diffraction (XRD), and dynamic rheometer. The effects of polymer structure and properties, as well as the surface sizing of the paper, were investigated. WPET displayed better surface sizing properties when it was prepared under the following conditions: –COO/–OH molar ratio of 1:2, the SIPM content of 17.98%, and TMP content of 11.10%. The relationships between the WPET structure and sized paper were clearly illustrated. The mechanical properties and water resistance of sized paper did not only depend on multi-branched hydroxyl groups of the WPET chains but also relied on the interactions among polymers and fibers, as well as the high toughness of surface sizing agent. The sizing paper possesses excellent mechanical properties as well as water resistance.

Properties and Application of Waterborne Polyurethane/starch Composite Surface Sizing Agent

2011 ◽  
Vol 317-319 ◽  
pp. 15-18 ◽  
Author(s):  
Yu Hua Guo ◽  
Shu Cai Li ◽  
Gao Sheng Wang
Keyword(s):  
Mechanical Properties ◽  
Water Resistance ◽  
Waterborne Polyurethane ◽  
Polymerization Process ◽  
Composite Surface ◽  
Surface Sizing ◽  
End Capping ◽  
Development Prospects

TDI as main isocyanate, IPDI as end-capping reagent, waterborne polyurethane (WPU) surface-sizing agent have been obtained by a pre–polymerization process. WPU were mixed with starch SSA in different proportion and a composite sizing agent obtained. It is indicated the water resistance, gloss and folding resistance of WPU/starch sized papers are much higher than starch sized papers. The ink absorption obviously decreases and the mechanical properties wholly increase. WPU/starch composite emulsions is a new kind of surface sizing agent having broad development prospects.

Synthesis and characterization of alicyclic two-component waterborne polyurethane

2018 ◽  
Vol 47 (4) ◽  
pp. 315-322 ◽  
Author(s):  
Jizhi Zhang ◽  
Xiankai Jiang
Keyword(s):  
Thermal Stability ◽  
Water Resistance ◽  
Aqueous Dispersion ◽  
Waterborne Polyurethane ◽  
Molar Ratio ◽  
Mechanical And Thermal Properties ◽  
Content Type ◽  
Two Component ◽  
Practical Implications

Purpose The purpose of this paper is to synthesize and characterize a series of alicyclic two-component waterborne polyurethane (2K-WPU) which is composed of non-ionic polyisocyanate aqueous dispersion and hydroxyl aqueous dispersion. Design/methodology/approach The appearances of aqueous dispersions and 2K-WPU films were observed by photographs. The micromorphology of alicyclic polyisocyanate aqueous dispersion was examined by scanning electron microscopy (SEM). The molecule structures of WPU were studied by Fourier transform infrared (FTIR). The effect of NCO:OH molar ratio of two components and trimethylolpropane (TMP) content on the thermal stability, mechanical and water resistance properties of 2K-WPU films was studied. Findings It was found by SEM that alicyclic polyisocyanate particles in aqueous dispersion showed a kind of spherical particle appearance, in which hydrophobic polyisocyanate was encapsulated by hydrophilic ether linkages segment. FTIR showed that WPU was polymerized through mixture of polyisocyanate component and hydroxyl component and increasing NCO:OH molar ratio of two components from 1.1:1 to 1.5:1 had increased the content of urea, urethane and allophanate of 2K-WPU films. Increasing NCO:OH molar ratio had improved the mechanical and thermal properties of the 2K-WPU film, but the water resistance of the 2K-WPU film increased first and then weakened. Increasing TMP contents from 1 to 0.75 mol for 1:5 system had improved the mechanical, thermal and water resistance properties of the 2K-WPU film. Practical implications The investigation established a method to prepare alicyclic 2K-WPU which is composed of non-ionic polyisocyanate aqueous dispersion and hydroxyl aqueous dispersion. The prepared 2K-WPU film could be applied in the field of waterborne surface coating, e.g. textile, wood and synthetic leather surfaces (Hasan et al., 2017; Akindoyo et al., 2016). Originality/value The paper established a method to synthesize alicyclic two-component 2K-WPU. The effect of NCO:OH molar ratio and TMP content on the thermal stability, mechanical and water resistance properties of 2K-WPU films were studied.

scholarly journals Polyurethane Impregnation for Improving the Mechanical and the Water Resistance of Polypropylene-Based Textiles

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1951
Author(s):  
Antonella Patti ◽  
Francesco Costa ◽  
Marta Perrotti ◽  
Domenico Barbarino ◽  
Domenico Acierno
Keyword(s):  
Abrasion Resistance ◽  
Water Resistance ◽  
Waterborne Polyurethane ◽  
Woven Fabric ◽  
Resistance Surface ◽  
Technical Textiles ◽  
Potential Applicability ◽  
Incremental Improvement ◽  
Temperature And Pressure ◽  
Drying Conditions

Commercial waterborne polyurethane (PU) dispersions, different in chemistry and selected on the basis of eco-friendly components, have been applied to a common polypropylene (PP)-based woven fabric. Impregnation has been chosen as a textile treatment for improving the features of basic technical textiles in light of potential applicability in luggage and bag production. The effect of drying method, performed under conditions achieved by varying the process temperature and pressure, on the features of the treated textiles, has been verified. The prepared specimens were characterized in terms of mechanical behavior (tensile, tear and abrasion resistance) and water resistance (surface wettability and hydrostatic pressure throughout the treated textiles). The experimental results suggest an incremental improvement of the tensile features for all the investigated specimens. For tear strength, no augmentation compared to that of the neat textile, could be verified as a consequence of polyurethane treatment. Remarkable improvements of abrasion resistance were displayed for all the impregnated PP textiles. Benefits in water resistance could be attributed to the presence of hydrophobic PU in the textile weaving of the PP samples. The ultimate improvement in water resistance was dependent on drying conditions.

Influence of Polymer Charge, Temperature, and Surfactants on Surface Sizing of Liner and Greaseproof Paper With Hydrophobically Modified Starch

TAPPI Journal ◽  
2009 ◽  
Vol 8 (2) ◽  
pp. 33-38 ◽  
Author(s):  
ANNA JONHED ◽  
LARS JÄRNSTRÖM
Keyword(s):  
Phase Separation ◽  
Contact Angles ◽  
Low Ph ◽  
Hydrophobically Modified ◽  
Paper Sizing ◽  
Surface Sizing ◽  
Separation Temperature ◽  
Hydrophobic Nature ◽  
Sizing Agents ◽  
Charge Temperature

The aim of this study was to investigate the properties of hydrophobically modified (HM) quaterna-ry ammonium starch ethers for paper sizing. These starches possess temperature-responsive properties; that is, gelation or phase separation occurs at a certain temperature upon cooling. This insolubility of the HM starches in water at room temperature improved their performance as sizing agents. The contact angles for water on sized liner were substantially larger than on unsized liner. When the application temperature was well above the critical phase-separation temperature, larger contact angles were obtained for liner independently of pH compared with those at the lower application temperature. Cobb60 values for liner decreased upon surface sizing, with a low pH and high application temperature giving lower water penetration. Contact angles on greaseproof paper decreased upon sur-face sizing as compared to unsized greaseproof paper, independently of pH and temperature. Greaseproof paper showed no great difference between unsized substrates and substrates sized with HM starch at different pH. This is probably due to the already hydrophobic nature of greaseproof paper. However, the Cobb60 values increased at low pH and low application temperature. Surfactants were added to investigate how they affect the sized surface. Addition of surfactant reduces the contact angles, in spite of indications of complex formation.

Effect of crystalline structure on water resistance of waterborne polyurethane

2021 ◽  
pp. 110647
Author(s):  
Zhengkai Wei ◽  
Zhimeng Liu ◽  
Xiaowei Fu ◽  
Yuechuan Wang ◽  
Anqian Yuan ◽  
...  
Keyword(s):  
Crystalline Structure ◽  
Water Resistance ◽  
Waterborne Polyurethane

Study on Surface Sizing of Cationic Polyacrylate Emulsion to Improve Mechanical Properties of Paper

2012 ◽  
Vol 200 ◽  
pp. 287-291 ◽  
Author(s):  
Quan Xiao Liu ◽  
Wen Cai Xu ◽  
Yan Na Yin
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Positive Charge ◽  
Solid Content ◽  
Drying Methods ◽  
Machine Direction ◽  
Surface Sizing ◽  
Emulsion Layer ◽  
Folding Endurance ◽  
Tearing Strength

Cationic polyacrylate emulsion was used as surface sizing agent and the effects of emulsion properties on paper mechanical properties were studied. The mechanical properties of sized paper gradually increased with the increase of solid content, viscosity and positive charge density of emulsion and decreased with the increase of particle size of emulsion. Tensile strength, folding endurance and tearing strength on machine direction were increased 33.62%, 11.99%, 6.79% respectively when the paper with single emulsion layer was used oven drying methods.

Preparation and Properties of Waterborne Varnish for On-Demand Inkjet Printing

2021 ◽  
Author(s):  
Jilei Chao ◽  
Ruizhi Shi ◽  
Fuqiang Chu ◽  
Yanling Guo ◽  
Qian Deng
Keyword(s):  
Inkjet Printing ◽  
Ring Opening ◽  
Water Resistance ◽  
Epoxy Group ◽  
Molar Ratio ◽  
Esterification Reaction ◽  
Trimellitic Anhydride ◽  
Friction Resistance ◽  
Ring Opening Reaction ◽  
Film Forming

A kind of waterborne varnish for inkjet printing was synthesized, and properties of the waterborne varnish were characterized to make it suitable for the glazing requirements of inkjet printing and other printability requirements. The waterborne varnish was synthesized from epoxy resin (E-51), epoxy diluent (ED), acrylic acid, trimellitic anhydride, maleic anhydride and organic amine by three steps of ring opening reaction, esterification reaction, neutralization reaction. The viscosity, film-forming property, water absorption of waterborne varnish and the water resistance, lightness, wear resistance and bonding strength of coated paper were tested. The effects of the ratio of E-51 and ED in the polymerization system on the properties of waterborne varnish were studied. In the test of printability of self-made waterborne varnish, the absorption of digital inkjet paper to varnish and the influence of varnish on color reproduction of printed image were discussed and studied. The results show that when the molar ratio of epoxy group in E-51 and ED is about 1:1, the prepared varnish is suitable for inkjet printing, and its film-forming property, such as water resistance, adhesion and friction resistance are better. At the same time, its printability is also better.

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