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Preparation method for waterborne polyurethane with improved fire resistance by virtue of nano materials

A technology of water-based polyurethane and nano-materials, which is applied in the field of preparation of nano-materials to improve the flame retardancy of water-based polyurethanes, can solve the problems of limiting the use range of inorganic nano-materials, poor compatibility and dispersion, and decreased mechanical properties of materials to achieve good synergy effect, improved flame retardancy, low price effect

Active Publication Date: 2013-02-13
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of inorganic nanomaterials is relatively large (see: Yuan Shaoyan, Xu Hong, Gu Hongchen. Research on flame-retardant polymer-based nanocomposites [J]. Functional Materials, 2005, 36 (6): 817-820) , and its surface is hydrophilic and oleophobic, highly polar, and easy to agglomerate, which makes its compatibility and dispersion in organic materials poor, which directly leads to the decline of the mechanical properties of the material (see: Zhang Ying, Hou Wensheng, Wei Liqiao , et al. Surface modification of nano-SiO2 and its application in polyurethane elastomers [J]. Functional Materials, 2006, 37(8): 1286-1288), which greatly limited the The scope of use of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] (1), in the 500ml four-neck flask that stirrer blade, thermometer, condenser tube are housed, polytetrahydrofuran ether glycol 100g is mixed with isophorone diisocyanate 33.3g, in the presence of dibutyltin dilaurate catalyst 0.27g Under the condition of 75°C for 1.5h, 133.5g of polyurethane prepolymer A was obtained;

[0019] (2) Add 4.77g of dimethylolpropionic acid and 16g of acetone solvent to A, react at 65°C for 1.5h, add 5.99g of triethylamine for neutralization reaction for 30min, add 20g of water for emulsification, and form 180g of Polyurethane B spare;

[0020] (3), 10 g of sodium lauryl sulfate is dissolved in 50 g of water, add nano-magnesium oxide 1 g, vinyltriethoxysilane 2 g, dimethyl methylphosphonate 1 g, and use a shear emulsification speed of 300 r / min , and the emulsification time was 20 minutes to obtain nanomaterial emulsion C for later use;

[0021] (4) Add 9g of nanomaterial emulsion C to B, and under the condition of pH 7, the shear stirring...

example 2

[0023] (1), in the 500ml four-neck flask that stirrer blade, thermometer, condensation pipe are housed, polytetrahydrofuran ether glycol 100g is mixed with isophorone diisocyanate 99.9g, in the presence of dibutyltin dilaurate catalyst 1.0g Under the condition of 95°C for 3.5 h, 200.9 g of polyurethane prepolymer A was obtained;

[0024] (2) Add 21.1g of dimethylolbutyric acid and 50.2g of acetone solvent to A, react at 85°C for 3.5h, add 12.1g of triethylamine for neutralization reaction for 50min, add 20g of water for emulsification, and form 304g The polyurethane emulsion B is spare;

[0025] (3), sodium polyacrylate 10g is dissolved in water 50g, adds nano magnesium hydroxide 5g, vinyl trimethoxysilane 4g, ethylene diamine tetramethylene phosphonic acid 3g, emulsifies with shearing at 1100r / min, emulsified for 40 min to obtain nanomaterial emulsion C for subsequent use;

[0026] (4) 30.4 g of nanomaterial emulsion C was added to B, under the condition of pH 7, the shear...

example 3

[0028] (1), in the 500ml four-neck flask that stirrer blade, thermometer, condensation tube are housed, polytetrahydrofuran ether glycol 100g is mixed with isophorone diisocyanate 66.6g, in the presence of dibutyltin dilaurate catalyst 0.58g Under the condition of 85°C for 2.5 h, 167.2 g of polyurethane prepolymer A was obtained;

[0029] (2) Add 10.5g of dimethylolbutyric acid and 29.3g of acetone solvent to A, react at 75°C for 2.5h, add 8.78g of triethylamine for neutralization reaction for 40min, add 20g of water for emulsification, and form 235g Polyurethane B spare;

[0030] (3), polyvinyl alcohol 10g is dissolved in water 50g, adds nano-silica 3g, γ-methacryloyloxypropyltrimethoxysilane 3g, dimethyl methylphosphonate 2g, with shearing Emulsify at 700r / min, emulsify for 30min, get nanomaterial emulsion C for later use;

[0031] (4) Add 17.6g of nanomaterial emulsion C to B, and under the condition of pH 7, the shear stirring speed is 850 rpm, and the stirring time is 3...

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PUM

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Abstract

The invention discloses a preparation method for waterborne polyurethane with improved fire resistance by virtue of nano materials. Under the condition that a dibutyltin dilaurate catalyst exists, PTMG and IPDI (isophorone diisocyanate) are mixed for reaction at the temperature of 75-95 DEG C for 1.5-3.5 hours, so that polyurethane prepolymer can be obtained; a hydrophilic chain extender, of which the weight of carboxyl groups is 1.2-3.2 % of that of the polyurethane prepolymer, and an acetone solvent, of which the weight is 12-25% of that of the polyurethane prepolymer, are added into the polyurethane prepolymer for reaction at 65-85 DEG C for 1.5-3.5 hours, then, triethylamine is added for neutralization reaction for 30-50 minutes, and water is added for emulsification, so that polyurethane emulsion A can be formed; nano material emulsion, with the weight being 5-10% of that of the polyurethane emulsion A, is added into the polyurethane emulsion A, and the mixture of the nano material emulsion and the polyurethane emulsion A is subject to shear agitation for 20-50 minutes under the condition that the pH value is 7, as a result, the fire resistance waterborne polyurethane can be obtained. The prepared fire resistance polyurethane is environment-friendly and low is price, and can meet the low cost requirement on fire resistance leather products by the market.

Description

technical field [0001] The invention relates to a preparation method of polyurethane used in a tanning process, in particular to a preparation method of nanomaterials for improving the flame retardancy of water-based polyurethane. Background technique [0002] Waterborne 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 form a stable system by using a specific process. 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 polyurethane. [0003] Nanomaterials that can improve the f...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08K9/06C08K9/04C08K3/22C08K3/36C08K5/5333C08K5/5353C08G18/66C08G18/48C08G18/10
Inventor 段宝荣
Owner STATE GRID CORP OF CHINA
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