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Preparation method of solvent-free water-based polyurethane resin

A water-based polyurethane and solvent-free technology, applied in the field of polymer materials, can solve problems such as unfavorable environments, achieve the effects of improving compatibility and adhesion, avoiding excessive viscosity of materials, and improving strength

Inactive Publication Date: 2015-02-11
JIANGSU HUAXIA PAINT MAKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention: In the traditional polyurethane preparation process, a solvent needs to be added to adjust the viscosity, which is not conducive to the environment. A method for preparing a solvent-free water-based polyurethane resin is proposed

Method used

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  • Preparation method of solvent-free water-based polyurethane resin
  • Preparation method of solvent-free water-based polyurethane resin
  • Preparation method of solvent-free water-based polyurethane resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0043] The raw materials and proportioning ratios used in the following examples are shown in Table 1.

[0044] Table 1 embodiment 1~5 and comparative example 1~3 reaction condition and parameter (unit: g)

[0045]

[0046]

[0047] Preparation:

[0048] After mixing polyisocyanate, amino-type cage silsesquioxane, polyol, ethoxy-terminated polymer diol, hydrophilic monomer, and catalyst di-n-butyltin dilaurate, proceed at 50-110°C The prepolymerization reaction takes 2 to 4 hours to obtain a polyurethane prepolymer. Add neutralizer and water to the polyurethane prepolymer at room temperature for forced dispersion, then add chain extender at 30-50°C for chain extension reaction for 2-4 hours, then cool down to room temperature to obtain water-based polyurethane.

[0049] Performance tests were carried out on the water-based polyurethanes prepared in the above examples and comparative examples, and the specific results are shown in Table 2.

[0050] The performance test...

Embodiment 6

[0054] The amount of ethoxy-terminated polymer diol was varied in this example.

[0055] A kind of preparation method of solvent-free aqueous polyurethane resin, comprises the steps:

[0056] Step 1, 200g of toluene diisocyanate, 10g of aminopropyl cage silsesquioxane T8, 50g of ethylene glycol, 2,2-dimethylol butoxyethylene glycol (20EO) methyl ether, two 40g of methylolpropionic acid and 1g of catalyst were mixed evenly, and the temperature was raised to 100°C for prepolymerization / 2h to obtain a polyurethane prepolymer;

[0057] Step 2: Add 1g of ammonia water and 550g of water to the polyurethane prepolymer, disperse evenly, then add 20g of 1,4-butanediamine to carry out chain extension reaction, temperature is 50°C, time is 3h, and it is lowered to room temperature to obtain waterborne polyurethane .

[0058] The performance data of the waterborne polyurethane prepared in this embodiment are shown in Table 3.

[0059] The performance data of different ethoxy-terminated...

Embodiment 7

[0063] In this example, alkyd resin-modified polyisocyanate is used. The modification method is: mix 30 g of cottonseed oil and 4 g of glycerin evenly, heat up to 120 ° C, add 0.1 g of KOH catalyst, react at 200 ° C for 2 hours, and cool down Finally, add 3g of benzoic acid and react at 180°C for 2h. When the temperature is lowered to 40°C, add 30g of toluene diisocyanate and 20g of xylene, raise the temperature to 65°C and keep it for 2h. After cooling down to room temperature, filter to obtain the modified alkyd resin non-toxic polyisocyanate. It is used in the preparation of waterborne polyurethane.

[0064] The 1st step, with alkyd resin modified toluene diisocyanate 200g, aminopropyl cage type silsesquioxane T8 10g, ethylene glycol 50g part, 2,2-dimethylol butoxyethylene glycol ( 20EO) 60g of methyl ether, 40g of dimethylolpropionic acid, and 1g of catalyst were mixed evenly, and the temperature was raised to 100°C for prepolymerization / 2h to obtain a polyurethane prepol...

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Abstract

The invention belongs to the field of high polymer materials, and particularly relates to a preparation method of a solvent-free water-based polyurethane resin. The method comprises the following steps: uniformly mixing polyisocyanate, amino cage-type silsesquioxane, polyalcohol, ethoxy terminated polymer diol, hydrophilic functional monomer and a catalyst di-n-butyltin dilaurate, and carrying out prepolymerization reaction at 50-110 DEG C for 2-4 hours to obtain a polyurethane prepolymer; adding a neutralizer and water into the polyurethane prepolymer at room temperature, carrying out forced dispersion, adding a chain extender at 30-50 DEG C to carry out chain extension reaction for 2-4 hours, and cooling to room temperature to obtain the water-based polyurethane. The water-based polyurethane resin is solvent-free, and has the characteristic of zero VOC (volatile organic compound) discharge. The performance determination proves that the binding strength is 6.2 MPa above and optimally 6.5 MPa, the wear resistance is 0.87% below and optimally 0.65%, and the number of freezing times can be more than 10.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a preparation method of a solvent-free waterborne polyurethane resin. Background technique [0002] Waterborne polyurethane is an emerging polymer material developed from water as a dispersant instead of organic solvents. Its special molecular structure and aggregation state make it have excellent properties such as abrasion resistance, flexibility, adhesion and chemical resistance. The coating film formed by it has good mechanical properties, good wear resistance, high hardness, water resistance, chemical resistance, aging resistance and other excellent properties, and can be widely used in textiles, printing and dyeing, leather processing, coatings, adhesives, wood processing, fields such as construction and papermaking. [0003] Water-based polyurethane combines the advantages of polyurethane with the low volatile organic compound (VOC) content of water-based itse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/38C08G18/32C08G18/12
CPCC08G18/12C08G18/3275C08G18/348C08G18/3893C08G18/4833C08G18/6692C08G18/3228
Inventor 程齐利徐艳
Owner JIANGSU HUAXIA PAINT MAKING
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