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Organic Li-based bentonite-WPU (waterborne polyurethane) leather finishing agent and preparation method thereof

A water-based polyurethane and leather finishing agent technology, which is applied in the treatment of dyed organosilicon compounds, dyed low-molecular-weight organic compounds, and fibrous fillers. and other problems, to achieve the effect of smooth surface, improved wetting effect, and improved water vapor permeability

Inactive Publication Date: 2013-02-27
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the large specific surface area of ​​lithium bentonite nanoparticles and insufficient coordination of surface atoms, the activation of active atoms on the surface of nanoclay increases, and it is easy to combine with other atoms around or itself, resulting in "deactivation" and "agglomeration". Strong water, poor dispersion in organic phase, and poor compatibility with organic polymers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] First use silane coupling agent to modify lithium bentonite, the specific operation method is as follows: weigh 10.0g lithium bentonite, make it into an aqueous dispersion with a mass fraction of 10%, swell in water for 2 hours, and stir at a stirring speed of 1000rpm for 1.5 h, ultrasonically disperse for 1 h, add 0.3 g of silane coupling agent into the reaction vessel, and stir and react at a temperature of 60° C. for 3 h. After the reaction is completed, cool, filter, wash with distilled water and 80% isopropanol solution three times, filter, dry at 100°C for 48 hours to constant weight, cool in a desiccator, and grind into powder to obtain organolithium bentonite.

[0034] Add 5g of organolithium bentonite and 100g of polybutylene adipate (Mn=1000) to the reactor at the same time, stir and disperse at 90°C for 2h, mix well, cool to room temperature, add 34g of toluene diisocyanate, at 85 After reacting at ℃ for 1 hour, add 8g of dimethylol propionic acid, stir and r...

Embodiment 2

[0036] First use a quaternary ammonium salt-hexadecyltrimethylammonium bromide to modify lithium bentonite, the specific operation method is as follows: weigh 10.0g of lithium bentonite, and make a water-dispersed solution with a mass fraction of 5%. liquid, swell in water for 2 hours, vigorously stir for 2 hours, ultrasonically disperse for 1 hour, add to the reaction vessel, and at the same time configure 10 g of cetyltrimethylammonium bromide aqueous solution with a mass concentration of 20%, and add it to lithium soap by dropping In the soil dispersion liquid, the dropping time was controlled at 0.5h, and the reaction was stirred at a temperature of 75°C for 3h. After the reaction was completed, cool, filter, wash with distilled water and 50% ethanol solution, and wash with 1% AgNO 3 The solution was titrated to check that there was no Br in the filtrate - Dry at 90-120°C for 24h-48h to constant weight, cool in a desiccator, and grind into powder to obtain organolithium b...

Embodiment 3

[0041] First use ethylenediamine to modify lithium bentonite. The specific operation method is as follows: Weigh 10.0g lithium bentonite to prepare an aqueous dispersion with a mass fraction of 10%, swell in water for 1 hour, vigorously stir for 2 hours, and ultrasonically disperse for 1.5 hours , into the reaction vessel, add 20 g of dihexadecyldimethyl ammonium chloride solution with a mass fraction of 10%, and stir and react at a temperature of 75° C. for 2 h. After the reaction is completed, cool, filter, wash with distilled water and 75% isopropanol solution three times, filter, dry at 100°C for 48 hours to constant weight, cool in a desiccator, and grind into powder to obtain organolithium bentonite.

[0042] Add 5g of organolithium bentonite and 100g of polyoxypropylene diol to the reactor at the same time, stir and disperse at 90°C for 2h, mix well, cool to room temperature, and add 50.5g of diphenyl-4,4'-diisocyanate to the reaction In the container, after reacting at...

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Abstract

The invention discloses an organic Li-based bentonite-WPU (waterborne polyurethane) leather finishing agent and a preparation method thereof. The method comprises the following steps: firstly, carrying out organic modification on Li-based bentonite so as to prepare organic Li-based bentonite; and then, dispersing the organic Li-based bentonite into a WPU matrix in nano scale by using a latex commixing or in-situ polymerization method so as to obtain the organic Li-based bentonite-WPU leather finishing agent. In the invention, because quaternary ammonium salts, organic amines, a coupling agentand polyisocyanates are selected to carry out organic modification on Li-based bentonite, the surface microenvironment of a chain-connected silicate layer of the Li-based bentonite and the wetting action (on polymers) of the Li-based bentonite are improved, thereby enhancing the dispersibility of the Li-based bentonite in organic polymers and the compatibility of the Li-based bentonite and the organic polymers, and better facilitating the expression of nano effects; and because the Li-based bentonite with a two-dimensional nanostructure is introduced into the WPU matrix by using a latex commixing or in-situ polymerization method, therefore, due to the unique structure and properties of a nano-clay, while the transparency of a finishing material is not affected, the thermal stability, friction-resistant strength and water vapor permeability of the finishing material can be improved markedly, and the mechanical properties of the finishing material are also enhanced and toughened.

Description

technical field [0001] The invention relates to the field of nanoclay research and the development of water-based polyurethane leather finishing materials, in particular to an organolithium bentonite-water-based polyurethane leather finishing agent and a preparation method thereof. Background technique [0002] Nanomaterials refer to materials with at least one dimension in the nanoscale range (1-100nm) in three-dimensional space. In recent years, with the continuous advancement of nanotechnology, the types of nanomaterials are increasing day by day. Nanotechnology and nanomaterials have become a hot spot in scientific research and material development, and have penetrated into various fields of material science research. In 1986, Toyota Corporation of Japan prepared the first polymer / layered silicate nanocomposite material, which achieved strong inorganic / organic interfacial bonding and self-assembly, and the prepared composite material has advantages that conventional mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/572D06M15/568D06M15/564D06M11/79C08G18/42C08G18/48C08K9/04C08K9/06C08K3/34C09C1/42C09C3/12C09C3/08
Inventor 林炜王春华穆畅道李德富
Owner SICHUAN UNIV
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