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Method for preparing fire-retarding aqueous polyurethane

A water-based polyurethane and flame-retardant technology, applied in polyurea/polyurethane coatings, coatings, fire-resistant coatings, etc., can solve problems such as high cost, easy-to-corrosion equipment, and a large amount of smoke, and achieve good compatibility, low price, The effect of raising costs

Active Publication Date: 2013-01-30
ZHEJIANG XINLI NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when polyurethane modified by brominated flame retardants burns, it produces a lot of smoke and is easy to corrode equipment, so it is subject to certain restrictions.
However, the flame-retardant water-based polyurethane currently on the market in my country is mainly of the blended compound type, and the flame-retardant effect is achieved by adding a large amount of flame retardant. This method is costly and has a great impact on the performance of polyurethane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] (1), in a 500ml four-necked flask equipped with a stirring blade, a thermometer, and a condenser tube, 10.2 g of tetrakis hydroxymethyl phosphorus sulfate is mixed with 33.6 g of hexamethylene diisocyanate, and the dibutyltin dilaurate catalyst is mixed with 0.13 In the presence of g, react at 80°C for 1 h to obtain 43.9 g of polyurethane prepolymer;

[0018] (2) Add 1.97g of hydrophilic chain extender dimethylol propionic acid and 4.39g of butanone solvent to the polyurethane prepolymer, react at 60°C for 2 h, add 2.12g of triethylamine for neutralization reaction 20 min, add water 150g and carry out emulsification to form solid content and be 202.4g of polyurethane 24% hydrophilic, transfer to the 500ml beaker for subsequent use;

[0019] (3), add 6g of sodium bentonite, 24g of water bentonite and 0.45g of sodium lauryl sulfate to a 50ml beaker, and at a temperature of 30°C and a pH of 7, ultrasonically pulverize for 20min to obtain a bentonite dispersion for subseque...

example 2

[0022] (1), in the 500ml four-neck flask that stirrer blade, thermometer, condensation pipe are housed, tetrakis hydroxymethyl phosphorus chloride 4.75g is mixed with hexamethylene diisocyanate 42g, dibutyltin dilaurate catalyst 0.28 In the presence of g, react at 100°C for 3 h to obtain 47.0 g of polyurethane prepolymer;

[0023] (2), add 4.64g of hydrophilic chain extender dimethylol butyric acid and 9.4g of butanone solvent to the polyurethane prepolymer, react at 80°C for 3 h, add 2.44g of triethylamine to carry out neutralization reaction For 40 min, add 160g of water to emulsify to form 223.5g of water-based polyurethane with a solid content of 24.2%, and transfer it to a 500ml beaker for subsequent use;

[0024] (3), add 6g of calcium-based bentonite, 24g of water bentonite and 0.54g of sodium dodecylbenzenesulfonate to a 50ml beaker, and ultrasonically pulverize for 20min at a temperature of 30°C and a pH of 7 to obtain a bentonite dispersion spare;

[0025] (4) Add ...

example 3

[0027] (1), in a 500ml four-neck flask equipped with a stirring blade, a thermometer, and a condenser tube, 10.2 g of tetrakis hydroxymethyl phosphorus sulfate is mixed with 58.8 g of hexamethylene diisocyanate, and the dibutyltin dilaurate catalyst is mixed with 0.31 In the presence of g, react at 90°C for 2 h to obtain 69.3 g of polyurethane prepolymer;

[0028] (2), add 4.7g of hydrophilic chain extender dimethylolpropionic acid and 10.4g of butanone solvent to the polyurethane prepolymer, react at 70°C for 2.5 h, add 3.5g of triethylamine to carry out neutralization reaction 30 min, add 160g of water for emulsification, and form 247.9g of water-based polyurethane with a solid content of 31.3%, transfer it to a 500ml beaker for subsequent use;

[0029] (3), add 6g of sodium bentonite, 24g of water bentonite and 0.5g of sodium polyacrylate to a 50ml beaker, and ultrasonically pulverize for 20min at a temperature of 30°C and a pH of 7 to obtain a bentonite dispersion for subs...

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PUM

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Abstract

The invention discloses a method for preparing fire-retarding aqueous polyurethane, which comprises the following steps of: reacting a polyhydroxyl phosphorus compound and hexamethylene diisocyanate in the presence of a dibutyltin dilaurate catalyst for 1 to 3h to obtain a polyurethane prepolymer; adding hydrophilic chain extender containing 1.5 to 3 percent by total weight of polyurethane prepolymer of carboxyl and a butanone solvent which is 10 to 20 percent by the total weight of polyurethane prepolymer into the polyurethane prepolymer, reacting for 2 to 3h, adding triethylamine, neutralizing the reaction solution for 20 to 40min, and adding water for emulsification to form hydrophilic polyurethane; and adding bentonite dispersion liquid and phospholipid into the hydrophilic polyurethane, and shearing and stirring for 30 to 80 minutes under a condition of a pH value of 7 to obtain the fire-retarding aqueous polyurethane. The polyurethane has greatly improved fire retardance and mechanical property.

Description

technical field [0001] The invention relates to a preparation method of a water-based polyurethane finishing agent used in a tanning process, in particular to a preparation method of a flame-retardant water-based polyurethane finishing agent. Background technique [0002] Water-based polyurethane (also known as water-based polyurethane) is a polyurethane resin containing hydrophilic groups in the molecular chain of polyurethane, which has a strong affinity with water. It can be dispersed in water and formed by using a specific process. stable system. Water-based polyurethane is mainly used in leather finishing, textile printing and dyeing, papermaking, architectural coatings, adhesives, etc. Almost all of the materials involved are flammable materials. If these materials are not treated with flame retardant, they will inevitably become a fire hazard. . The flame retardancy of waterborne polyurethane is one of the important directions of functionalization of waterborne poly...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D5/18C08G18/38C08G18/34C08G18/32C08G18/10
Inventor 段宝荣
Owner ZHEJIANG XINLI NEW MATERIAL CO LTD
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