A kind of high oxygen barrier waterborne polyurethane/montmorillonite nanocomposite emulsion and its preparation method
A water-based polyurethane and nano-composite technology, applied in the direction of polyurea/polyurethane coatings, coatings, fire-retardant coatings, etc., can solve the problems of insignificant increase of MMT interlayer spacing, limited dispersion of modified MMT, etc., and achieve mechanical properties. The effect of improving, enhancing barrier properties and improving compatibility
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0052] The preparation of polyethylenimine (Mw=25000) modified montmorillonite dispersion liquid is as follows:
[0053] Weigh 1.0 g of montmorillonite MMT, add 200 mL of distilled water to make 0.5 wt % montmorillonite dispersion, stir at room temperature (stirring speed: 300 rpm) for 24 h, and ultrasonically (power: 300 W) disperse for 30 min. Weigh 2.16g polyethyleneimine, configure 25g aqueous solution in a beaker at normal temperature and stir (stirring speed is 150rpm) for 2h; The dropping time is controlled at 30 minutes, and the reaction is 12 hours. After the reaction is completed, naturally cool to room temperature and centrifuge at 8000-12000rpm at high speed; then wash and centrifuge with deionized water for 2-3 times, and redisperse the centrifuged modified montmorillonite MMT In water and dimethylformamide (DMF) (the ratio of water and DMF is 10:90), the ratio of modified montmorillonite and mixed solvent is 1:100, then adopt cell disruptor to process 1h under ic...
Embodiment 2
[0055] A kind of preparation of aqueous polyurethane nanocomposite emulsion and film, concrete operation is as follows:
[0056] Add 43.5g of 4,4'-dicyclohexylmethane diisocyanate (HMDI) and 46.5g of polytetramethylene glycol (PTMG) into a 250mL four-necked flask equipped with a stirrer, a thermometer and a spherical condenser, and add 0.15g of di Dibutyltin laurate (DBTDL) catalyst and 20g of acetone were reacted at 80°C for 2h, and the temperature was controlled at 85°C; then the temperature was lowered to 60°C, and 6g (2g+2g+2g) of dimethylol propionic acid (DMPA) was added in three times, Add 20g of acetone each time, and react for 1h, 1h, and 4h respectively; finally cool down to 50°C, add 4g of 1,4-butanediol (BDO) and 20g of acetone to react for 2h; measure by toluene-di-n-butylamine back titration Reaction degree until the determined NCO group content reaches the theoretical value to obtain a polyurethane prepolymer; then lower the temperature to 15°C in an ice-water b...
Embodiment 3
[0066] A kind of preparation of aqueous polyurethane / polyethyleneimine modified montmorillonite nanocomposite emulsion and membrane, concrete operation is as follows:
[0067] Get the polyethyleneimine modified montmorillonite dispersion of Example 1 and pour it into a 250mL three-necked flask, and add the neutralized polyurethane prepolymer (polyurethane prepolymer prepared in Example 2) dropwise, wherein the modified The mass ratio of montmorillonite and prepolymer is shown in Table 2. The reaction temperature is 15°C, and it is stirred at a high speed at 1000 rpm; Polyurethane / polyethyleneimine modified montmorillonite nanocomposite emulsion; move the emulsion into a glass mold to dry, and finally prepare a waterborne polyurethane / polyethyleneimine modified montmorillonite nanocomposite film.
[0068] Different (the amount of montmorillonite in montmorillonite solution) modified montmorillonite (PEI-MMT) and (the amount of pure polyurethane in prepolymer) the mass ratio of ...
PUM
| Property | Measurement | Unit |
|---|---|---|
| specific surface area | aaaaa | aaaaa |
| pore size | aaaaa | aaaaa |
| cation exchange capacity (equivalent) | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More