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Prepolymer method used for preparing modified nano carbon black water-based color paste

A technology of nano-carbon black and water-based color paste, which is applied in pigment paste, textiles and papermaking, fiber treatment, etc., and can solve the problems of incomplete coating on the surface of carbon black particles and difficulty in adjusting the hydrophilic/hydrophobic properties of the coating layer. Achieve the effect of outstanding wet rub resistance, low cost, and outstanding black brightness

Inactive Publication Date: 2015-09-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The limitation of this method is that the surface coating of carbon black particles is not complete enough, and the hydrophilicity / hydrophobicity of the coating layer is difficult to adjust

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of prepolymer

[0026] Put 30-120 g of polyethylene glycol (400) in a three-necked flask equipped with a stirrer, thermometer and condensing device, dehydrate in vacuum at 120 °C for 2-4 h, cool down to 50 °C, add 10-40 g aromatic toluene diisocyanate, heat up to 60 °C for 0.5~1 h, then add 0.05~1.05 g dibutyltin dilaurate catalyst, react for 1~2 h, then add 1~5% dimethylol propionic acid for Chain extension, and then continue to react for 2~4 h, until the isocyanate content reaches the theoretical value (determined by di-n-butylamine titration), and the prepolymer is obtained.

[0027] Preparation of carbon black aqueous dispersion

[0028] Dissolve 15 g of hyperdispersant in 50 g of deionized water, then add 10 g of carbon black at a stirring speed of 6000 r / min, and disperse at high speed for 1 h to obtain a stable carbon black aqueous dispersion.

[0029] Preparation of modified nano-carbon black water-based color paste

[0030] The prepared 60 g carb...

Embodiment 2

[0032] Preparation of prepolymer

[0033] Put 30-120 g of polyethylene glycol (4000) in a three-necked flask equipped with a stirrer, thermometer and condensing device, dehydrate in vacuum at 120 °C for 2-4 h, cool down to 50 °C, add 10-40 g aromatic toluene diisocyanate, heat up to 60 °C for 0.5~1.0 h, then add 0.05~1.05 g organotin catalyst, react for 1~2 h, then add 1~5% dimethylol propionic acid for chain extension , and then continue to react for 2~4 h until the isocyanate content reaches the theoretical value (determined by di-n-butylamine titration method) to obtain a prepolymer.

[0034] Preparation of carbon black dispersion

[0035] Dissolve 15 g of hyperdispersant in 50 g of deionized water, then add 10 g of carbon black at a stirring speed of 6000 r / min, and disperse at high speed for 1 h to obtain a stable carbon black aqueous dispersion.

[0036] Preparation of modified nano-carbon black water-based color paste

[0037] The prepared 60 g carbon black water dis...

Embodiment 3

[0039] Preparation of prepolymer

[0040]Put 30-120 g of polyethylene glycol (400) in a three-necked flask equipped with a stirrer, thermometer and condensing device, dehydrate in vacuum at 120 °C for 2-4 h, cool down to 55 °C, add 10-40 g aliphatic diisocyanate, heat up to 70 °C for 0.5-1 h, then add 0.05-1.05 g organotin catalyst, react for 1-2 h, then add 1-5% dimethylol propionic acid for chain extension, Continue to react for another 2-4 h until the isocyanate content reaches the theoretical value (determined by di-n-butylamine titration) to obtain a prepolymer.

[0041] Preparation of carbon black dispersion

[0042] Dissolve 15 g of hyperdispersant in 50 g of deionized water, then add 10 g of carbon black at a stirring speed of 6000 r / min, and disperse at high speed for 1 h to obtain a stable carbon black aqueous dispersion.

[0043] Preparation of modified nano-carbon black water-based color paste

[0044] The prepared 60 g carbon black aqueous dispersion was mixed ...

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Abstract

The invention relates to a prepolymer method used for preparing modified nano carbon black water-based color paste. Carbon black possesses excellent stainability and stability, and is widely applied to the industrial fields such as rubber, paint, and plastic. Particle size of carbon black is small; specific surface area is large; surface function group content is low; particle clustering is easily caused, and is difficult to eliminate; so that further application of carbon black is limited to a great extent. The prepolymer method comprises following steps: (1) a polyurethane prepolymer is synthesized from polyethylene glycol and diisocyanate; (2) a carbon black aqueous dispersion is prepared with a hyperdispersant; (3) the polyurethane prepolymer is subjected to chain extension and dispersion in the carbon black aqueous dispersion so that the surfaces of carbon black particles are coated with polyurethane layers, and the steadily dispersed modified nano carbon black water-based color paste is obtained. The odified nano carbon black water-based color paste can be used for coloring of coating of leather, plastic, and woodenware, and especially can be used for leather coating as a novel black pigment paste; obtained coating layers are high in black brightness, and possesses dry and wet rubbing resistance, wear resistance, excellent flexicity, and high warping strength.

Description

technical field [0001] The invention relates to a method for preparing a modified nano-carbon black water-based color paste by a prepolymer method, in particular to a preparation method for a modified nano-carbon black water-based color paste that can be used for leather finishing agents. Background technique [0002] With the improvement of living standards, people's demand for high-grade leather products such as car seat leather and furniture leather is also increasing, and these leather products usually need to have high water resistance, abrasion resistance, wet rub resistance and high blackness Equal physical properties. [0003] The black pigment pastes currently used in leather finishing mainly include casein-containing pigment pastes with casein as the bonding component and casein-free pigment pastes dispersed with polymer hyperdispersants, which can meet the requirements of conventional coating performance, but are difficult to meet Some high-grade leather products...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D17/00C08G18/66C08G18/48C08G18/34C08G18/12C08G18/32D06M15/568D06M11/74
Inventor 李正军杜卫宁王健
Owner SICHUAN UNIV
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