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Hydrolysis resistant waterborne polyurethane dispersoid and preparation methd thereof

A technology of water-based polyurethane and dispersion, applied in the field of water-based polyurethane, can solve the problems of poor water resistance, achieve the effects of improving lipophilicity, good hydrolysis resistance, and simple preparation method

Active Publication Date: 2018-06-12
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a hydrolysis-resistant waterborne polyurethane dispersion and its preparation method, aiming to overcome the deficiencies of poor water resistance of polyurethane dispersions in the prior art

Method used

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  • Hydrolysis resistant waterborne polyurethane dispersoid and preparation methd thereof
  • Hydrolysis resistant waterborne polyurethane dispersoid and preparation methd thereof
  • Hydrolysis resistant waterborne polyurethane dispersoid and preparation methd thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A kind of hydrolysis-resistant aqueous polyurethane dispersion, it is prepared by following method:

[0028] S1. In a 100mL three-neck flask, blow nitrogen, take 0.5227g monolinolenic acid glyceride (LMG) and dissolve it in 15mL methyl ethyl ketone solvent, and adjust the solution to weak alkaline (pH=8) with ammonia water, stir at 60°C for one hour, Then, 0.0528g tetraethyl orthosilicate (TEOS) was dissolved in 5mL methyl ethyl ketone solvent and added dropwise to a three-necked flask, and reacted for 3h to obtain a compound containing glycerol monolinolenate and tetraethyl orthosilicate.

[0029] (LMG-TEOS nanocomposite) mixed solution, the specific reaction equation of S1 is as figure 1 shown;

[0030] S2. In a 250mL four-neck bottle equipped with a reflux device and a mechanical stirrer and protected by nitrogen, add 3g of polytetrahydrofuran (PTMG2000), 25mL of acetone and 0.3g of dibutyltin dilaurate (DBTDL) after drying , add and then heat up to 80°C, after the...

Embodiment 2

[0032] A kind of hydrolysis-resistant aqueous polyurethane dispersion, it is prepared by following method:

[0033] S1. In a 100mL three-neck flask, blow nitrogen, take 0.60g of monolinolenic acid glyceride (LMG) and dissolve it in 15mL of methyl ethyl ketone solvent, and adjust the solution to weak alkaline (pH=9) with ammonia water, and stir at 40°C for one hour. Then 0.06g tetraethyl orthosilicate (TEOS) was dissolved in 5mL methyl ethyl ketone solvent and added dropwise to a three-necked flask, and reacted for 4h to obtain a complex containing glycerol monolinolenate and tetraethyl orthosilicate.

[0034] (LMG-TEOS nanocomposite material) mixed solution;

[0035] S2. Add 3g (0.0015mol) of dried polytetrahydrofuran (PTMG2000), 30mL of acetone and 0.4g of dilauric acid di Add butyltin (DBTDL) and heat up to 75°C. After the system becomes a uniform and stable solution, add 0.0082mol of isophorone diisocyanate (IPDI), react at 75°C for 1 hour, add 0.0018mol of 2,2-dimethylol ...

Embodiment 3

[0037] A kind of hydrolysis-resistant aqueous polyurethane dispersion, it is prepared by following method:

[0038]S1. In a 100mL three-neck flask, blow nitrogen, take 0.50g of monolinolenic acid glyceride (LMG) and dissolve it in 15mL of methyl ethyl ketone solvent, and adjust the solution to weak alkaline (pH=7) with ammonia water, and stir at 40°C for one hour. Then 0.05g tetraethyl orthosilicate (TEOS) was dissolved in 5mL of methyl ethyl ketone solvent and added dropwise to a three-necked flask, and reacted for 3 hours to obtain a complex containing glycerol monolinolenate and tetraethyl orthosilicate (LMG-TEOS nanocomposite material) mixture;

[0039] S2. Add 3g (0.0015mol) of dried polytetrahydrofuran (PTMG2000), 28mL of acetone and 0.6g of dilauric acid di Add butyltin (DBTDL) and heat up to 85°C. After the system becomes a uniform and stable solution, add 0.0098mol of isophorone diisocyanate (IPDI), react at 85°C for 1 hour, add 0.0023mol of 2,2-dimethylol Propionic...

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Abstract

The invention relates to a preparation method of a hydrolysis resistant waterborne polyurethane dispersoid. The preparation method comprises the following steps that S1, a methyl ethyl ketone solutionof glycerol monolinolenic acidlinolenate is adjusted to be alkalescent by using ammonium hydroxide, then a methyl ethyl ketone solution of tetraethoxysilane is dripped in the methyl ethyl ketone solution of glycerol monolinolenatelinolenic acid and stirred to be reacted for 3-4 hours, and mixed liquid containing a compound of glycerol monolinolenic acidlinolenate and tetraethoxysilane is obtained; S2, under protection of nitrogen, dry polytetrahydrofuran, a catalyst and acetone are mixed and heated to obtain a homogenous solution, isophorone diisocyanate is added into the homogenous solution,and reactedion is conducted for 1-2 hours, then a N-methyl pyrrolidinone solution of 2,2-dimethylolpropionic acid is added, in and reaction is conducted reacted for 3-4 hours, the mixed liquid obtained in the S1 is added in after the temperature is decreased to be at the room temperature, then the temperature is increased and a reaction is conducted for 2-4 hours, triethylamine is added to neutralize the mixture, water is added to perform emulsification, acetone and methyl ethyl ketone are removed through rotary evaporation, and the hydrolysis resistant waterborne polyurethane dispersoid is obtained. The hydrolysis resistant waterborne polyurethane dispersoid has the beneficial effects that a composite nanomter material of glycerol monolinolenic acidlinolenate and tetraethoxysilane modifies waterborne polyurethane, and the hydrolytic resistance of waterborne polyurethane is improved obviously.

Description

technical field [0001] The invention belongs to the field of water-based polyurethane, and in particular relates to a hydrolysis-resistant water-based polyurethane dispersion and a preparation method thereof. Background technique [0002] Waterborne polyurethane dispersions (PUDs) have attracted a lot of attention due to their zero or very low volatile organic compound (VOC) content. Waterborne polyurethane (WPU) has many excellent properties, such as adhesion, flexibility, gloss and weather resistance, etc.; therefore, WPU is one of the fastest growing fields in the field of polyurethane chemistry and is widely used as adhesives, coatings and printing inks. However, the inherent disadvantage of WPU is poor water resistance, which limits their applications, which may be attributed to the insertion of hydrophilic ionic groups into the structure, thus exhibiting high hydrophilicity compared with solvent-borne polyurethanes. At the same time, due to the insertion of hydrophil...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/34C08G18/08C08K5/103C08K3/36C08J5/18
CPCC08G18/0823C08G18/348C08G18/4854C08G18/6692C08J5/18C08J2375/08C08K3/36C08K5/103
Inventor 易昌凤程朝李全涛邱少稳喻一鸣严正庞秋虎刘宇桅王晶
Owner HUBEI UNIV
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