Study on the NCO index and base knitted fabric substrates on the thermal, chemical, and mechanical properties of solvent-less formulations polyurethane artificial leather

Eun, Jong Hyun; Lee, Joon Seok

doi:10.1177/1558925020916458

Cited by 5 publications

(8 citation statements)

References 22 publications

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“…PU materials can be successfully synthesized into artificial leather materials after weaving and knitting by different weaving mode in figure 2. Eun et al [10] prepared and do a research on the thermal, chemical and mechanical properties of PU artificial leather with different NCO index ratios. The results showed that with the increase of NCO index, the functional groups and crosslinking degree of unreacted NCO increased.…”

Section: Application Of Functional Polyurethane In Artificial Leathermentioning

confidence: 99%

Study on Modification and Application of Functional Polyurethane in Leather Finishing

Qin

Liu²,

Kuang³

et al. 2023

J. Phys.: Conf. Ser.

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Over last few years, polyurethane (PU) has been applied in many fields by virtue of its mechanical strength, wear resistance, toughness, low temperature flexibility and other characteristics recently. To be more precise, PU materials can be screened through raw materials, improved formulas and so on to obtain the corresponding “customized” products. This gives the product “customizability” and further broadens the use of functional PUs. PU is one of the important coating materials in leather manufacture. This paper explores the academic research status of functional PU and its modification and application in leather production and leather finishing.

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Section: Application Of Functional Polyurethane In Artificial Leathermentioning

confidence: 99%

Study on Modification and Application of Functional Polyurethane in Leather Finishing

Qin

Liu²,

Kuang³

et al. 2023

J. Phys.: Conf. Ser.

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“…The whole glass was placed in the water bath at a constant speed and a fixed angle. According to some coagulation processes of WPL, 8,9,27,28 the process in this study is as follows: the film was first immersed in a water bath at 25 C for 10 minutes, then immersed in a water bath at 60 C for 30 min, and finally the washed film was dried at 80 C for 1 h to obtain WPL.…”

Section: Preparation Of Wet-type Polyurethane Leathermentioning

confidence: 99%

“…[5][6][7] Wet-type polyurethane artificial leather (WPL) is prepared by coating polyurethane solution (PUS) on non-woven, knitted fabric and other substrate, and then replacing organic solvents with water. 8,9 WPL is widely used in clothing, footwear, automobile decoration, office furniture and other fields. [10][11][12][13] PPCD synthesized from CO 2 and propylene oxide is a low molecular weight diol with the hydroxyl groups at the ends of its chains, which is one of the most widely used CO 2 -based oligomer.…”

Section: Introductionmentioning

confidence: 99%

Preparation of modified CO₂‐based polyurethane for wet‐type artificial leather with excellent alkali resistance

He,

Huang,

Chen

et al. 2023

J of Applied Polymer Sci

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Poly (propylene carbonate) diol (PPCD) is one of the most attractive CO2 copolymers. PPCD‐based polyurethane has excellent mechanical properties and hydrophilicity, and is widely used in various fields. However, poor alkali resistance limits the application of PPCD‐based polyurethane in wet‐type artificial leather (WPL). In order to solve this problem, polyurethane solution (PUS) for wet‐type artificial leather was prepared by using PPCD and polytetramethylene ether glycol (PTMG) as soft segments. The chemical structure, viscosity, molecular weight and distribution, physical and mechanical properties, thermal properties and dynamic mechanical thermal properties of PUS were characterized. The changes of the physical and mechanical properties of PUS films and surface morphology of WPLs after soaking in 10 wt% NaOH solution at room temperature for 24 h were studied, so as to evaluate the alkali resistance of polyurethane. The retention of tensile strength and tearing strength of PUS films modified by PTMG increased from 80% to 96% and from 89% to 100%, respectively. The scanning electron microscopy results showed that appropriate PTMG was beneficial to the formation of microporous structure for CO2‐based polyurethane leather. The leather without PTMG showed agglomeration phenomenon, the micropores were not obvious, and the changes were obvious after soaking in alkali solution. After being modified by PTMG, the morphology of leather after soaking in alkali solution was basically unchanged. Polyurethane leather prepared with PTMG and PPCD as soft segments has excellent alkali resistance. These results suggest that PPCD could be a potential artificial leather material.

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“…The aging of MPFs will induce further fragmentation and subsequent formation of much smaller debris. Synthetic fabrics are always considered a major source of MPFs, among which polyester (PET) occupies the most global textile fibers market, given the production and consumption, contributing to MP pollution in the environment. , In addition to the exclusive application in apparel and home fabrics, the PET knitted fabric is also one of the common raw materials of polyurethane synthetic leather (PU leather) as the base cloth . PU synthetic leather has complex plastic compositions, including upper PU resin and PET base fabric, which could generate MP particles (MPPs, L/W ratio <3), MPFs, and even NPs simultaneously.…”

Section: Introductionmentioning

confidence: 99%

“…2,5 In addition to the exclusive application in apparel and home fabrics, the PET knitted fabric is also one of the common raw materials of polyurethane synthetic leather (PU leather) as the base cloth. 6 PU synthetic leather has complex plastic compositions, including upper PU resin and PET base fabric, which could generate MP particles (MPPs, L/ W ratio <3), MPFs, and even NPs simultaneously. Moreover, PET and PU are the main plastic polymers based on production volumes, which result in the small particles and fiber composition found in the environment.…”

Section: Introductionmentioning

confidence: 99%

Formation of Nano- and Microplastics and Dissolved Chemicals During Photodegradation of Polyester Base Fabrics with Polyurethane Coating

Shi

Zheng

Huang

et al. 2023

Environ. Sci. Technol.

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Polyurethane (PU) synthetic leathers possess an intricate plastic composition, including polyester (PET) base fabrics and upper PU resin, but the release of fragments from the complexes is unclear. Therefore, we investigated the photodegradation trends of PET base fabrics with PU coating (PET-U) as a representative of composite plastics. Attention was paid to the comparison of the photoaging process of PET-U with that of pure PET base fabric (PET-P). To reveal the potential for chain scission, physical and chemical changes (e.g., surface morphology, molecular weight, and crystallinity) of the two fabrics were explored. The generation of microplastic fibers (MPFs) and microplastic particles (MPPs) was distinguished. Compared with PET-P, PET-U showed a similar but delayed trend in various characteristics and debris release rate as the photoaging time prolonged. Even so, after 360 h of illumination, the generated number of MPs (including MPFs and MPPs) rose considerably to 9.32 × 10 7 MPs/g, and the amount of released nanoplastics (NPs) increased to 2.70 × 10 11 NPs/g from PET-U. The suppression of MP formation from PET-U was potentially directed by the physical shielding of the upper PU layer and the dropped MPs, which resisted the photochemical radical effect. The components of dissolved organic matter derived from plastics (P-DOM) were separated by molecular weight using a size-exclusion chromatography−diode array detector−organic carbon detector/organic nitrogen detector (SEC-DAD-OCD/ OND), and the results showed that a larger amount of carbon-and nitrogen-containing chemical substances were generated in PET-U, accompanied by more aromatic and fluorescent compounds. The results provided theoretical bases and insights for future research on the risks of plastic debris from PU synthetic leathers on aquatic organisms and indicated feasible directions for exploring combined pollution studies of plastics.

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Study on the NCO index and base knitted fabric substrates on the thermal, chemical, and mechanical properties of solvent-less formulations polyurethane artificial leather

Cited by 5 publications

References 22 publications

Study on Modification and Application of Functional Polyurethane in Leather Finishing

Study on Modification and Application of Functional Polyurethane in Leather Finishing

Preparation of modified CO₂‐based polyurethane for wet‐type artificial leather with excellent alkali resistance

Formation of Nano- and Microplastics and Dissolved Chemicals During Photodegradation of Polyester Base Fabrics with Polyurethane Coating

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Study on the NCO index and base knitted fabric substrates on the thermal, chemical, and mechanical properties of solvent-less formulations polyurethane artificial leather

Cited by 5 publications

References 22 publications

Study on Modification and Application of Functional Polyurethane in Leather Finishing

Study on Modification and Application of Functional Polyurethane in Leather Finishing

Preparation of modified CO2‐based polyurethane for wet‐type artificial leather with excellent alkali resistance

Formation of Nano- and Microplastics and Dissolved Chemicals During Photodegradation of Polyester Base Fabrics with Polyurethane Coating

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Preparation of modified CO₂‐based polyurethane for wet‐type artificial leather with excellent alkali resistance