High-flame-retardant waterborne polyurethane and preparation method thereof

A water-based polyurethane, high flame retardant technology, applied in the field of organic polymers, can solve the problems of easy migration of liquid flame retardants, affecting the performance of polyurethane, and unstable water dispersion.

Inactive Publication Date: 2020-10-27
SHANGHAI DIMU NEW MATERIAL TECH
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of additive flame retardant water-based polyurethane has a simple process, but the addition of flame retardant ingredients in the blend can easily reduce the stability of the water-based polyurethane emulsion and even lead to demulsification. At the same time, these flame retardants are difficult to stably disperse in the water-based polyurethane and easily form precipitation.
Although the liquid flame retardant will not produce precipitation, it will affect the film-forming properties of water-based polyurethane and the properties of the film formed after film formation, such as sticky film and insufficient bonding performance, etc. At the same time, the liquid flame retardant is easy to migrate out
Inorganic substances (such as magnesium hydroxide, aluminum hydroxide, etc.) filling modification generally need to add a large amount to achieve the flame retardant effect, but adding a large amount of inorganic substances will affect other properties of polyurethane
At present, the additive flame-retardant water-based polyurethane used for flame-retardant finishing of fabrics on the market has the disadvantages of opaque coating, large amount of flame retardants, poor washing resistance, and easy migration, which affects the appearance of fabrics.
In addition, the introduction of flame retardant components into the molecular structure of polyurethane can also improve the flame retardant performance, but when the flame retardant components increase, polyurethane is difficult to emulsify, and the formed aqueous dispersion is unstable, that is, waterborne polyurethane cannot be formed or has poor stability. Problems in construction and application, and affect the performance of performance (such as flame retardancy, adhesion, etc.)

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-flame-retardant waterborne polyurethane and preparation method thereof
  • High-flame-retardant waterborne polyurethane and preparation method thereof
  • High-flame-retardant waterborne polyurethane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0043] The invention provides a kind of preparation method of highly flame-retardant water-based polyurethane, comprising the following steps:

[0044] a) Prepolymerizing polyols, stabilizers and polyisocyanates to obtain prepolymers;

[0045] b) emulsifying the prepolymer to obtain an emulsion;

[0046] c) mixing and reacting the emulsion with a phosphorus-containing chain extender to form water-based polyurethane;

[0047] The polyols include polypolyols;

[0048] Described polypolyol is non-phosphorus polyol and polyphosphate polyol;

[0049] Described polyphosphate polyol has structure shown in formula (1):

[0050]

[0051] In formula (1): R is a substituted or unsubstituted alkyl group, a substituted or unsubstituted phenyl group; the degree of polymerization n is 1-20;

[0052] The stabilizer includes a phosphonate-based stabilizer; the phosphonate-based stabilizer has a structure shown in formula (2):

[0053]

[0054] In formula (2): R is -COOH or -SO 3 Na...

Embodiment 1

[0098] S1. Polyester polyol (PCL1000, molecular weight 1000) 100g, formula 1 polyphosphate polyol (R is phenyl, hydroxyl value 60mgKOH / g) 100g, formula 2 phosphonate-based stabilizer (R is -SO 3 Na, hydroxyl value 210mgKOH / g) 4.9g, mixed and added to a reaction kettle equipped with a condenser and a mechanical stirrer; heated to 85°C, while stirring under vacuum for 2.5h to remove water, and dry the mixture.

[0099] S2. Cool the mixture below 50°C, add 6.3g of isophorone diisocyanate, 8.7g of hexamethylene diisocyanate, and 5.5mg of dibutyltin dilaurate, heat to 80°C, stir for 4 hours, and cool down to 60°C °C to continue the reaction, measure the NCO content until it reaches the target value range, then lower the temperature to stop the reaction and obtain a prepolymer.

[0100] S3. Add 120 g of acetone to dissolve the prepolymer to form a homogeneous solution, then add 0.5 g of triethylamine and mix well to form a neutralized prepolymer solution.

[0101] S4. Mix the neutr...

Embodiment 2

[0104] S1, polyether polyol (model 2000LM, molecular weight 2000) 80g, formula 1 polyphosphate polyol (R is methyl, hydroxyl value 55mgKOH / g) 120g, formula 2 phosphonate-based stabilizer (R is -SO 3 Na, hydroxyl value 205mgKOH / g) 6.3g, mixed and added to a reaction kettle equipped with a condenser and a mechanical stirrer; heated to 85°C, while stirring under vacuum for 2.5h to remove water, and dry the mixture.

[0105] S2. Cool the mixture below 50°C, add 13.4g of isophorone diisocyanate and 5.5mg of dibutyltin dilaurate, heat to 80°C, stir for 4 hours, cool down to 60°C to continue the reaction, measure the NCO content until it reaches When the target value is within the range, the temperature is lowered to stop the reaction to obtain a prepolymer.

[0106] S3. Add 120 g of acetone to dissolve the prepolymer to form a homogeneous solution, then add 0.5 g of triethylamine and mix well to form a neutralized prepolymer solution.

[0107] S4. Mix the neutralized prepolymer sol...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Number average molecular weightaaaaaaaaaa
Number average molecular weightaaaaaaaaaa
Login to view more

Abstract

The invention provides waterborne polyurethane and a preparation method thereof. The preparation method comprises the following steps: letting phosphorus-free polyol react with specific phosphorus-containing polyol as shown in a formula (1), a phosphorus-containing stabilizer as shown in a formula (2) and polyisocyanate to form a prepolymer, emulsifying, and reacting with a phosphorus-containing chain extender to form the waterborne polyurethane. Phosphorus-containing groups are introduced into a soft segment of a polyurethane molecular chain by adopting phosphorus-containing polyol shown as the formula (1) to form a part of a waterborne polyurethane structure unit, so that the waterborne polyurethane structure unit has flame retardance under the condition that a flame retardant is not added; by adopting the phosphorus-containing stabilizer as shown in the formula (2), emulsification of phosphorus-containing waterborne polyurethane can be promoted, and the problem that emulsion is unstable after chain extension is solved, so that the problems that when a phosphorus-containing group is introduced into a polyurethane molecular structure, emulsification is difficult, and a waterbornedispersion liquid is difficult to form are solved. Moreover, phosphine-containing groups are introduced into the soft segment, the stabilizer and the chain extender of the waterborne polyurethane, sothat the flame retardance is greatly improved; and meanwhile, the binding power of the waterborne polyurethane is also enhanced by introducing a specific phosphorus-containing structure.

Description

technical field [0001] The invention relates to the field of organic polymers, in particular to a high flame-retardant waterborne polyurethane and a preparation method thereof. Background technique [0002] Water-based polyurethane is a block-type polymer green environmental protection material formed by alternating soft segments (polyester / polyether polyol) and rigid segments (isocyanate, small molecule chain extender). Waterborne polyurethane not only has the unique flexibility, friction resistance, low temperature resistance and good film-forming ability of polyurethane, but also uses water as a dispersant, has extremely low VOC emissions, reduces environmental pollution, and is widely used in adhesives, coatings , fabric finishing agent, leather finishing agent, paper and fiber surface treatment agent, water-based ink, papermaking and other fields. In the past few decades, waterborne polyurethane has received a lot of attention, so a lot of research has been done on it....

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C08G18/66C08G18/42C08G18/48C08G18/64C08G18/32C08G18/12
CPCC08G18/12C08G18/3885C08G18/4081C08G18/42C08G18/4277C08G18/4283C08G18/48C08G18/6461C08G18/6651C08G18/6685C08G18/3889
Inventor 张义张俊学
Owner SHANGHAI DIMU NEW MATERIAL TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap