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Polysiloxane-polyether copolymer modified aqueous polyurethane preparation method

A polyether copolymer and water-based polyurethane technology, which is applied in the manufacture of polysiloxane-polyether copolymer-modified water-based polyurethane, can solve the problem of high price of terminal hydroxyalkyl siloxane, affecting the mechanical strength of the coating, and industrialization. Promote low value and other problems, to achieve the effect of improving moisture permeability, improving heat resistance, and excellent storage stability

Inactive Publication Date: 2008-07-16
山东圣光化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the siloxane group is at the end of the molecular chain, which is easily hydrolyzed and the stability of the emulsion is not good
The introduction of siloxanes with ether chains in their side chains into polyurethane will also lead to excessive crosslinking, which will affect the mechanical strength of the coating.
From an economic point of view, the price of terminal hydroxyalkyl siloxane is higher, and the value of industrialization promotion is lower

Method used

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  • Polysiloxane-polyether copolymer modified aqueous polyurethane preparation method
  • Polysiloxane-polyether copolymer modified aqueous polyurethane preparation method
  • Polysiloxane-polyether copolymer modified aqueous polyurethane preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] α.ω dihydroxy polydimethylsiloxane liquid: 3.5 kg, TDI: 0.6 kg into the reactor, react at 98°C for 1 hour, add polyether polyol: 9 kg, react at 105°C for 2- After 4 hours (NCO is 0), after the polysiloxane-polyether copolymer is prepared, add TDI: 11.8 kg, react for 2-3 hours at 85°C (NCO% is 9.8%), add dimethylolpropane Acid: 2.5 kg, react at 82°C for 1-2 hours (NCO% is 5.1%), add 1,4-butanediol: 2 kg and acetone: 16 kg of blended dispersion, at 65°C Reaction 2-4 hour, (NCO% is 0.81%) obtains polyurethane resin, and its structural formula is I, and polyurethane resin is added mixing tank, and the rotating speed is controlled at 900 rev / min, adds triethylamine under the condition of room temperature 3 ℃: 1.8 kilograms , distilled water: 51.6 kg, isophorone diamine: 1.2 kg, stir and disperse for 2-30 minutes to obtain a polyurethane emulsion, its structural formula is II, add the polyurethane emulsion to the precipitation kettle, and remove it under the condition of 55°C...

Embodiment 2

[0050] Polyether polyol: add 16 kg to the reaction kettle, heat up to 68°C, dehydrate for 0.6 hours under the condition of vacuum degree 0.09Mpa, add IPDI: 2.3 kg, α.ω dihydroxy polydimethylsiloxane liquid: 8.5 kg The blended dispersion liquid was reacted at 98°C for 2-4 hours (NCO is 0) to obtain polysiloxane-polyether copolymer, adding IPDI: 23 kg, and reacted at 82°C for 2-3 hours (NCO % is 11.1%), add dimethylolpropionic acid: 3.1 kg, react at 82°C for 1-2 hours (NCO% is 4.9%), add ethylene glycol: 2.6 kg and acetone: 31 kg of blend Dispersion, react at 65°C for 2-4 hours (NCO% is 0.75%) to obtain polyurethane resin, its structural formula is I, add polyurethane resin to the mixing tank, rotate at 1000 rpm, stir and disperse at room temperature at 15°C , add triethylamine: 2.9 kg, distilled water: 108.8 kg, isophorone diamine: 1.8 kg, stir and disperse for 2-30 minutes to obtain a polyurethane emulsion, its structural formula is II, add the polyurethane emulsion to the sol...

Embodiment 3

[0053] Hydroxyl-terminated polydimethylsiloxane liquid: 6.5 kg, TDI: 1.2 kg into the reactor, react at 98°C for 1 hour, add polyether polyol: 13.5 kg, react at 105°C for 2-4 hours (NCO is 0), polysiloxane-polyether copolymer is obtained, add MDI: 18.2 kilograms, react 2-3 hours under the condition of 83 ℃ (NCO% is 11.6%), add dimethylolpropionic acid: 3.4 kg, react at 83°C for 1-2 hours (NCO% is 6.3%), add 1,4-butanediol: 2.8 kg and acetone: 23 kg of blended dispersion, and react at 63°C for 2- 4 hours (NCO% is 0.69%), obtained polyurethane resin, and its structural formula is 1, and polyurethane resin is added mixing barrel, and rotating speed is controlled at 1200 revs / min, adds triethylamine under the condition of 20 ℃ of room temperature: 2.5 kilograms, distilled water: 77.3 kg, diethylenetriamine: 1.6 kg, stirring and dispersing for 2-30 minutes to obtain a polyurethane emulsion, its structural formula is II, adding the polyurethane emulsion to the solvent removal kettle,...

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Abstract

The invention relates to a method for preparing aqueous polyurethane. It comprises following steps: employing polyisocyanates bridging agent, proceeding copolymerization with excess aqueous polyether, liquid ploydimethyl oxosilane ternary block and getting ployoxosilane-polyether polymer, introducing polyurethane and organic silicon when generating carbamate with carbamate to main chain, adding chain propagation agent for chain propagation reaction and getting preploymer containing hydrophilic group; adding mixture of polyhydroxy compound and dissolvent into reaction system for second chain propagation reaction; neutralizing by adding neutralization agent, adding water for emulsification, adding polyamine for chain propagation; distilling to remove dissolvent after reaction and getting aqueous polyurethane modified with aqueous polyurethane-polyether polymer. The product possesses characteristics of polyurethane and polysiloxane, the storage stability, mechanics property and comprehensive performance is increased and it mainly is used as pigmentum and aqueous industrial coating material.

Description

technical field [0001] The invention relates to a method for producing waterborne polyurethane, in particular to a method for producing polysiloxane-polyether copolymer modified waterborne polyurethane. Background technique [0002] Water-based polyurethane has the advantages of non-combustibility, non-toxicity, no pollution to the environment, energy saving, etc., and has excellent properties such as high strength, wear resistance, and safety in use. Therefore, it has been widely used and will become an important development direction at home and abroad. However, so far, my country's industrialized water-based polyurethane has few varieties and low output. It is basically some aromatic pure polyurethane emulsion. General performance leather finishing and fabric treatment. By closely monitoring the NCO content of the pre-polymer of water-based polyurethane before and after dispersing into water or adopting the post-chain extension process, the water resistance and solvent re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/77C08G18/48C08G18/83C08G18/08D06M15/653C09D175/08B05D7/12
Inventor 崔新荣
Owner 山东圣光化工集团有限公司
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