Hyperbranched poly-blend soft-segment modified chain extension anti-flaming waterborne polyurethane

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: 2017-08-29
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

[0035] Add 37.42g of PPG1000 to a 250mL three-necked flask with a stirring device, vacuum and stir at 110°C for 1 hour to remove water, cool to 80°C, add 5.25g of DMPA, and then add 20.85g of TDI, connect the condenser, and then The temperature was raised to 85°C for 2h, until the -NCO content no longer changed, then 7.50g OP550 and 20g methyl ethyl ketone were added and the reaction continued for 3h until the -NCO content no longer changed. After cooling to 40°C, 3.98g TEA was added to three mouths Neutralize the reaction in the bottle for 10 minutes to obtain the prepolymer; add 135mL of 0℃ deionized water to the prepolymer which is vigorously stirred with an emulsifier at a speed of 2400 rpm for emulsification, and immediately add BPPO acetone after adding water The solution, in which the mass of BPPO is 6.97g, carries out post-chain extension while emulsifying, and emulsifies for 15 minutes to obtain an emulsion; then add the AWHBPU aqueous solution neutralized with the salt...

Embodiment 2

[0042] Add 49.89g of PPG1000 to a 250mL three-necked flask with a stirring device, vacuum and stir at 110℃ for 2h to remove water, cool to 80℃, add 7.00g of DMPA, then add 27.80g of TDI, connect the condenser, and then The temperature was raised to 85°C and reacted for 2h until the -NCO content no longer changed. Then 10.0g OP550 and 20g methyl ethyl ketone were added to continue the reaction for 3h. After cooling to 30°C, 5.31g TEA was added to the three-necked flask to neutralize the reaction for 20 minutes, and Prepolymer: Add 135mL of 10°C deionized water to the prepolymer that is vigorously stirred with an emulsifier at a speed of 2400 rpm for emulsification. After the water is added, immediately add the N-methylpyrrolidone solution of BPPA, where, The quality of BPPA is 10.32g, and it is emulsified while extending the chain and emulsifying for 15 minutes to obtain an emulsion; then add the AWHBPU aqueous solution neutralized with the salt-forming agent B to the emulsion, c...

Embodiment 3

[0049] Add 59.84g of PTMG2000 into a 250mL three-necked flask with a stirring device, vacuum and stir for 3 hours at 110°C to remove water, cool to 80°C, add 4.20g of DMPA and 16.68g TDI, connect the condenser, and then heat to React at 84°C for 2h until the -NCO content no longer changes, then add 6.00g OP550 and 20g methyl ethyl ketone and continue to react for 3h until the -NCO content no longer changes. After cooling to 20°C, add 3.18g TEA into the three-necked flask Neutralize for 30 minutes to obtain a prepolymer; add 165mL of deionized water at 5°C to emulsify the prepolymer that is vigorously stirred with an emulsifier at a speed of 2400 rpm, and add BPPO acetone solution immediately after adding water. Among them, the mass of BPPO is 5.576g, and the 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 emulsion, and stirring is c...

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Abstract

The invention relates to hyperbranched poly-blend soft-segment modified chain extension anti-flaming waterborne polyurethane, which belongs to the field of flame retardant materials. The waterborne polyurethane is prepared by the following steps of after dehydrating macromolecule polyhydric alcohol, adding a hydrophilic chain extender and diisocyanate, reacting until -NCO content is constant, adding a phosphorus containing polyhydric alcohol macromolecule until -NCO content is constant, and adding a salt-forming agent A to obtain a prepolymer; adding water into the prepolymer, adding an acetone / butanone / N-methyl pyrrolidone solution of a phosphorus-containing diamine chain extender after adding water, and obtaining an emulsion; adding the emulsion into an AWHBPU water solution neutralized by a salt-forming agent B for emulsifying, spin-evaporating to remove a solvent, and obtaining the waterborne polyurethane. The waterborne polyurethane is subjected to soft-segment anti-flaming modification, so that a flame retardant property is improved, and the waterborne polyurethane is halogen-free and environmentally-friendly; through chain extension modification, a flame retardant property is improved, a mechanical property is improved, and the stability is improved; through blending the AWHBPU and the chain extension anti-flaming waterborne polyurethane, a mechanical property and the stability are further improved.

Description

Technical field [0001] The invention relates to a chain-extended flame-retardant waterborne polyurethane after modification of a hyperbranched blended soft segment, which belongs to the field of flame-retardant materials. technical background [0002] Waterborne polyurethane is non-toxic, non-polluting, and highly designable, but it also has disadvantages such as poor flame retardancy, insufficient mechanical properties, and poor emulsion stability. [0003] For the modification of the flame-retardant properties of waterborne polyurethane, there are mainly two methods: physical blending modification and intrinsic flame-retardant modification. The latter has the advantages of better durability and the flame retardant components are not easy to migrate out. It is divided into soft section flame-retardant modification, hard section flame-retardant modification and co-modification of soft and hard section. The flame-retardant modification of the soft segment is realized by introducing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/08C08L75/04C08G18/66C08G18/48C08G18/34C08G18/32C08G18/12
CPCC08G18/0823C08G18/12C08G18/6666C08G18/6692C08L75/08C08L2201/02C08L2205/02C08L75/04C08G18/3889
Inventor 罗运军董承昊柴春鹏张博文
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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