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Water-based polyurethane dispersoid and preparation method thereof

A water-based polyurethane and prepolymer technology, applied in the field of polymer materials, can solve problems such as corneal irritation, odor, and health damage to construction workers, and achieve the effect of low VOC

Inactive Publication Date: 2015-12-30
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the prepolymer mixing method, dimethylol acid is usually used to prepare water-based polyurethane dispersion. Correspondingly, triethylamine or ammonia is used as a dispersant in aqueous solution. These chemicals have odor and are harmful to human cornea. It has a strong stimulating effect and causes great harm to the health of construction workers

Method used

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  • Water-based polyurethane dispersoid and preparation method thereof
  • Water-based polyurethane dispersoid and preparation method thereof
  • Water-based polyurethane dispersoid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] (1) Preparation of prepolymer: 100.04g of isophorone diisocyanate was added to 100g of polytetrahydrofuran ether glycol (Mn=2000) and 50.5g (Mn=232) of dihydroxy compounds containing tertiary amines (as shown in formula 17 Shown) in the mixed system, react at 80°C for 120 minutes;

[0055](2) Neutralization, chain extension and emulsification: under one atmospheric pressure, add the prepolymer and 13.04g diethanolamine to 660g saturated carbonic acid aqueous solution and emulsify and disperse at a high speed in the reaction kettle, and at the same time, pass in carbon dioxide and heat up to 80°C for reaction After 180 minutes, an aqueous polyurethane dispersion with a solid content of 30% was obtained.

[0056]

[0057] Formula 17.

Embodiment 2

[0059] (1) Preparation of prepolymer: Add 16.82g of 1,6-hexamethylene diisocyanate to 100g of polytetrahydrofuran ether diol (Mn=2000) and 50.5g (Mn=232) of dihydroxy compounds containing tertiary amines (such as In the mixed system shown in formula 17), react at 85°C for 60 minutes, then cool down to 50°C; add 68.91g of isophorone diisocyanate to the above system, and react at 80°C for 90 minutes;

[0060] (2) Neutralization, chain extension and emulsification: under one atmospheric pressure, add the prepolymer and 12.50g N-methyldiethanolamine to 660g saturated carbonic acid aqueous solution and emulsify and disperse at a high speed in the reactor, and at the same time pass in carbon dioxide, and raise the temperature to After reacting at 80°C for 180 minutes, an aqueous polyurethane dispersion with a solid content of 30% was obtained.

Embodiment 3

[0062] (1) Preparation of prepolymer: Add 100.04g of isophorone diisocyanate to 100g of polytetrahydrofuran ether glycol (Mn=2000), 25g of methyl methacrylate, 10g of butyl methacrylate and 50.5g of (Mn= 232) In the mixed system of dihydroxy compounds containing tertiary amines (as shown in formula 17), react at 80°C for 120 minutes;

[0063] (2) Neutralization, chain extension and emulsification: under one atmospheric pressure, add the prepolymer and 13.04g diethanolamine to 660g saturated carbonic acid aqueous solution and emulsify and disperse at a high speed in the reactor, and at the same time introduce carbon dioxide, heat up to 80°C for reaction After 180 minutes, a waterborne polyurethane and acrylate mixed dispersion with a solid content of 37% was obtained.

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Abstract

The invention provides a preparation method of water-based polyurethane. The method comprises the steps of (1) reacting polyisocyanates with polyether glycol and a tertiary amine-containing dyhydroxy compound (or / and a tertiary amine-containing di-primary amine compound) to obtain a prepolymer; (2) neutralizing by using carbonic acid aqueous solution, adding water for dispersion and emulsion, and enabling the prepolymer and a hydrophilic chain extender to perform chain extension reaction, so as to obtain water-based polyurethane dispersion liquid. The invention also provides water-based polyurethane resin prepared by the method. The water-based polyurethane has all advantages of other water-based polyurethanes, taking triethylamine or ammonia as a disperser is avoided, and the problems of bad smell and high VOC of the ordinary water-based polyurethanes are solved.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a water-based polyurethane dispersion material and a preparation method thereof. Background technique [0002] Polyurethane resin is widely used in coatings and bonding due to its excellent adhesive properties, good chemical resistance, water resistance and solvent resistance, outstanding wear resistance and flexible operation. Traditional polyurethane resins usually contain a certain proportion of organic solvents, which can no longer meet the needs of today's increasingly serious environmental protection problems. For the polyurethane resin industry, in recent years, it has changed from the original highly polluting solvent-based polyurethane resin to low-pollution or non-polluting water-based resin; on the other hand, the energy crisis is also one of the main problems facing the world today. However, the curing of traditional thermosetting coatings consu...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/12C09D175/08
CPCC08G18/6688C08G18/12C08G18/3275C08G18/4854C09D175/08
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