Post-chain extending flame-retardant waterborne polyurethane modified by hyperbranched blended hard segment

A technology of water-based polyurethane and post-chain extension, which is applied in the field of flame-retardant materials, can solve the problems of reduced flame-retardant performance and limited practical applications, and achieves stable flame-retardant effects, improved mechanical properties, and increased stability

Inactive Publication Date: 2017-07-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN104047176A discloses a preparation method of hyperbranched waterborne polyurethane / compounded flame retardant waterborne polyurethane blend emulsion. By blending hyperbranched waterborne polyurethane with terminal hydroxyl blocked and flame retardant waterborne polyurethane, the mechanical properties of waterborne polyurethane coating are improved ; But when the content of hyperbranched water-based polyurethane is high, its flame retardant performance decreases significantly, which limits the practical application of this product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 33.45g of PPG1000 to a 250mL three-necked flask with a stirring device, vacuumize and stir at 110°C for 1 hour to remove moisture, cool down to 80°C, add 5.25g of DMPA, then add 24.82g of TDI, connect the condenser, and then Raise the temperature to 85°C for 2 hours until the -NCO content does not change, then add 7.50g of Fyrol-6 and 20g butanone to continue the reaction for 3h, until the -NCO content does not change, after cooling down to 40°C, add 3.98g of TEA Add 135 mL of deionized water at 0°C to the prepolymer under vigorous stirring with an emulsifier at a speed of 2400 rpm for emulsification, and add BPPO immediately after adding water The acetone solution, wherein, the quality of BPPO is 8.25g, post-chain extension is carried out while emulsifying, emulsifying for 15min to obtain an emulsion; then add the AWHBPU aqueous solution neutralized with salt-forming agent B into the emulsion, continue stirring for 5min to mix evenly, Then it was left standing for ...

Embodiment 2

[0043] Add 44.6g of PPG1000 to a 250mL three-necked flask with a stirring device, vacuumize and stir at 110°C for 2h to remove moisture, cool down to 80°C, add 7.00g of DMPA, then add 33.01g of TDI, connect the condenser, and then Raise the temperature to 85°C for 2 hours until the -NCO content does not change, then add 10.0g of Fyrol-6 and 20g of butanone to continue the reaction for 3h, after cooling down to 40°C, add 5.31g of TEA into the three-necked flask for neutralization for 10 minutes , to obtain a prepolymer; add 135mL of deionized water at 10°C to the prepolymer under vigorous stirring with an emulsifier at a speed of 2400 rpm for emulsification, and immediately add the N-methylpyrrolidone solution of BPPA after adding water, Among them, the mass of BPPA is 13.91g, and post-chain extension is carried out while emulsifying, and the emulsion is obtained by emulsifying for 15 minutes; then the AWHBPU aqueous solution neutralized with salt-forming agent B is added to the...

Embodiment 3

[0050] Add 53.52g of PTMG2000 to a 250mL three-necked flask with a stirring device, vacuumize and stir at 110°C for 2h to remove moisture, cool down to 80°C, add 4.20g of DMPA and 19.86g of TDI, connect a condenser, and then raise the temperature to 85°C ℃ for 2 hours, until the -NCO content does not change, then add 6.00g of Fyrol-6 and 20g butanone to continue the reaction for 3 hours, until the -NCO content does not change, after cooling down to 40 ℃, add 3.18g of TEA into the three-necked flask Neutralize and react for 10 minutes to obtain a prepolymer; add 165mL of deionized water at 5°C to the prepolymer under vigorous stirring with an emulsifier at a speed of 2400 rpm for emulsification, and immediately add the acetone solution of BPPO after adding water , where the mass of BPPO is 6.6g, post-chain extension is carried out while emulsifying, emulsifying for 15min to obtain an emulsion; then add the AWHBPU aqueous solution neutralized with salt-forming agent B into the em...

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Abstract

The invention relates to a post-chain extending flame-retardant waterborne polyurethane modified by a hyperbranched blended hard segment, and belongs to the field of flame-retardant materials. The waterborne polyurethane is prepared by a method with the following steps of dewatering macromolecular polyols, adding a hydrophilic chain extender and diisocyanate, and reacting until the content of -NCO is not changed; adding phosphor-containing polyol micromolecules until the content of -NCO is not changed; adding a salt forming agent A, so as to obtain a prepolymer; adding water into the prepolymer, and then adding an acetone/butanone/N-methyl pyrrolidone solution of a phosphorus-containing diamine chain extender, so as to obtain an emulsion; adding the emsulion into an AWHBPU water solution neutralized by a salt forming agent B to emulsify, and performing rotary evaporation to remove the solvent, so as to obtain the waterborne polyurethane. The waterborne polyurethane has the advantages that by modifying flame retardance via the hard segment, the flame-retardant property is improved, and the halogen-free and environment-friendly effects are realized; by modifying via post-chain extending, the flame-retardant property is improved, the mechanical property is improved, and the stability is improved; by blending the AWHBPU and the post-chain extending flame-retardant waterborne polyurethane, the mechanical property and stability are further improved.

Description

technical field [0001] The invention relates to a hyperbranched blended hard segment modified chain-extended flame-retardant water-based polyurethane, which belongs to the field of flame-retardant materials. [0002] technical background [0003] Water-based polyurethane is non-toxic, non-polluting, and has strong designability, but it also has disadvantages such as poor flame retardancy, insufficient mechanical properties, and poor emulsion stability. [0004] For the modification of the flame retardant performance of waterborne polyurethane, there are mainly two methods: physical blending modification and intrinsic flame retardant modification. It is divided into soft segment flame retardant modification, hard segment flame retardant modification and soft and hard segment co-modification. The flame retardant modification of the hard segment is realized by introducing small molecules of phosphorus-containing polyols with flame retardant properties into the polyurethane hard...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/34C08G18/76C08G18/38C08G18/66C08G18/12C08L75/08C08L75/04C08J5/18
CPCC08G18/0823C08G18/12C08G18/348C08G18/4825C08G18/4854C08G18/6692C08G18/7614C08J5/18C08J2375/08C08J2475/04C08L75/08C08L2201/02C08L2205/02C08G18/3889C08L75/04
Inventor 罗运军董承昊柴春鹏张博文
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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