High-performance water-based polyurethane and its preparation method

A water-based polyurethane, hydrophilic technology, applied in the field of polyurethane, can solve the problem of reducing the effective chain extension, and achieve the effect of excellent properties

Inactive Publication Date: 2003-03-26
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a water-based PU and its preparation method to overcome the problem that the isocyanate functional group reacts with water in large quantities to reduce the effective chain extension when the prepolymer whose terminal group is aromatic isocyanate is dispersed into water; Pre-polymerization of aliphatic isocyanate without adding aliphatic or cycloaliphatic diisocyanate or other reactants; the resulting water-based PU has excellent storage stability and excellent mechanical properties, and can be applied to industrial coatings and synthetic leather or fabrics surface treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 14.07g of dimethylolpropionic acid (DMPA) and 33.33g of N-methylpyrrolidone (NMP) were stirred evenly in a reaction tank with nitrogen protection, and when the above-mentioned raw materials were in a homogeneous phase, 67.15g of Add 2,4- and 2,6-toluene diisocyanate (TDI) in a mixing ratio of 80:20 into the reaction tank, and after reacting for 1.5 hours at 60°C, add 218.78g of butanediol-adipic acid copolymer (PBA) (Mn=2000), after continuing the reaction at 60° C. for 4 hours, the temperature of the reaction tank was lowered to 50° C. and 10.6 g of triethylamine (TEA) was added to carry out neutralization reaction for 20 minutes. 270g of the pre-polymer that has been neutralized and has hydrophilicity is quickly added to 560g of deionized water with a stirring rate of 500rpm for water dispersion, and before the NCO value drops to 1.47wt%, add water-diluted ethylenediamine (EDA) 3.04g for chain extension reaction. The chain extension reaction was continued at room tem...

Embodiment 2

[0038] Stir 14.07g of DMPA and 33.33g of NMP evenly in a reaction tank protected by nitrogen gas. When the above raw materials are in a homogeneous phase, mix 71.62g of 2,4- and 2,6-TDI in a mixing ratio of 80:20 Add in the reaction tank, after reacting at 60°C for 1.5 hours, add 233.37g of polytetramethylene glycol (PTMEG) (Mn=1000), after continuing the reaction for 4 hours, reduce the temperature of the reaction tank to 50°C and add 10.6g TEA, for 20 minutes of neutralization reaction. 270g of the pre-polymer that has been neutralized and has hydrophilicity is quickly added into 450g of deionized water with a stirring rate of 500rpm for water dispersion. Before the NCO value drops to 2.03wt%, add 3.10g of EDA diluted with water to Perform chain extension reactions. The chain extension reaction was continued at room temperature for 2 hours to obtain an aqueous PU dispersion with a solid content of 33 wt%. The obtained dry film is insoluble in MEK and toluene, and its tolue...

Embodiment 3

[0040] Stir 12.19g of DMPA and 28.9g of NMP evenly in a reaction tank protected by nitrogen gas. When the above raw materials are in a homogeneous phase, mix 28.19g of 2,4- and 2,6-TDI with a mixing ratio of 80:20 Add to the reaction tank, after reacting at 60°C for 1.5 hours, add 189.61g of hexanediol-adipic acid [PHA] (Mn=2000), and react at 60°C for 4 hours, then lower the temperature of the reaction tank to 50°C Furthermore, 9.29 g of TEA was added, and neutralization reaction was performed for 20 minutes. 270g of the pre-polymer that has been neutralized and has hydrophilicity is quickly added to 400g of deionized water with a stirring rate of 500rpm for water dispersion. Before the NCO value drops to 1.47wt%, add 2.63g of EDA diluted with water to carry out chain extension reaction. The bond extension reaction was continued at room temperature for 2 hours to obtain an aqueous PU dispersion with a solid content of 35 wt%. The obtained dry film is insoluble in MEK and to...

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Abstract

A kind of high performance water polyurethane and its preparation method is disclosed in this invention. The polyurethane of the water polyurethane is made by listed components (a)-(c) mixing reaction of polymer to be polymerized. (a) 10-40 wt% acromatics cyanate; (b) 30-80 wt% polyols; (c) 1-15 wt% compound forming water functional group and having active hydrogen; and then (d) 0.1-5 wt% having active hydrogen chain continuation is extended. The invention recurs to strictly detect NCO content after the advance polymer spreading around the water to overcome the question of cyanate functional group reacting greatly with water acromatics and reducing valid chain extension at the time of terminal group acting as advance polymer of acromatics cyanate separating into the water.

Description

technical field [0001] The invention relates to a polyurethane (polyurethane; PU) and a preparation method thereof, in particular to a high-performance water-based polyurethane and a preparation method thereof. Background technique [0002] Polyurethane is a high-functional resin, but more than 90% of it contains a large amount of organic solvents, such as dimethylformamide (DMF), toluene, etc., which will cause environmental pollution and affect on-site operations when processed in downstream industries. threat to human health. However, as countries around the world are increasingly concerned about environmental protection and related pollution prevention and control regulations are becoming increasingly stringent, the PU resin industry has undergone revolutionary changes in recent years, that is, the original highly polluting solvent-based PU resin has been transformed into a low-pollution non-toxic water-based resin. [0003] The traditional method of preparing water-ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/06C08G18/32C08G18/76
Inventor 罗蕙蕙陈菀湘
Owner IND TECH RES INST
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