Preparation method of organosiloxane modified WPU/PVA (waterborne polyurethane/polyvinyl alcohol) film

A technology of organosiloxane modification, applied in the field of preparation of organosiloxane modified WPU/PVA film, to achieve the effect of maintaining sports activity, good effect, high anti-sticking and cracking resistance

Inactive Publication Date: 2013-06-12
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at providing a kind of preparation method of organosiloxane modified WPU / PVA film, to overcome the defect of PVA modification method at present

Method used

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  • Preparation method of organosiloxane modified WPU/PVA (waterborne polyurethane/polyvinyl alcohol) film
  • Preparation method of organosiloxane modified WPU/PVA (waterborne polyurethane/polyvinyl alcohol) film
  • Preparation method of organosiloxane modified WPU/PVA (waterborne polyurethane/polyvinyl alcohol) film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 7.4 grams of isophorone diisocyanate (IPDI), 11.7 grams of polypropylene glycol PPG-220, 0.6 grams of 1,4-butanediol (1,4-BD), 0.17 grams of trimethylolpropane (TMP), butyl Add 10 grams of ketone and 0.05 grams of dibutyltin dilaurate (DBTDL) into a 250 mL three-necked flask, stir at a speed of 100 rpm, react at 80 ° C for 1.5 hours, and then add 1.1 grams of dimethylol propionic acid (DMPA), React at 80°C for 5 hours at a stirring speed of 100 rev / min, cool down to 40°C, add 0.37 g of γ-aminopropyltriethoxysilane, react at a stirring speed of 100 rev / min for 20 minutes, then dropwise add 0.95 gram of triethylamine, and reacted at 30-40°C for 30 minutes at a stirring speed of 100 rev / min. Stir the deionized water at a speed of 500 rpm, and continue to stir for 15 minutes after the dropwise addition is completed, then add dropwise an aqueous solution of ethylenediamine, which is prepared by using 0.25 grams of ethylenediamine and 10 grams of water, and add dropwise Duri...

Embodiment 2

[0074] The preparation method of this example is the same as that of Example 1, except that 20 g of polyvinyl alcohol (PVA) aqueous solution with a mass percentage concentration of 5% and 10 g of organosiloxane modified WPU emulsion are mixed to form a film, and the obtained organosiloxane modified The water swelling rate, solvent swelling rate, tensile strength and elongation at break of the permanent WPU / PVA film are tested by the same method at 40°C, and thermal analysis test is carried out.

[0075] The test results are as follows:

[0076]The water swelling rate of the membrane is 62.7%, the solvent swelling rate is 50.3%, the tensile strength is 33.5MPa, and the elongation at break is 55.3%. Comparing these values ​​with the corresponding values ​​of M0, it can be seen that the membrane obtained in this embodiment has higher resistance to solvent swelling, higher strength and flexibility.

[0077] Thermal analysis spectrum such as image 3 shown.

[0078] Depend on ...

Embodiment 3

[0081] The preparation method of this example is the same as that of Example 1, except that 20 g of polyvinyl alcohol (PVA) aqueous solution with a mass percentage concentration of 5% and 5 g of organosiloxane modified WPU emulsion are mixed to form a film, and the obtained organosiloxane modified The water swelling rate, solvent swelling rate, tensile strength and elongation at break of the permanent WPU / PVA film are tested by the same method at 40°C, and thermal analysis test is carried out.

[0082] The test results are as follows:

[0083] The water swelling rate of the film is 106.4%; the solvent swelling rate is 71.7%; the tensile strength is 38.4MPa; the elongation at break is 30.9%. The Td value was 230.4°C. Comparing these values ​​with the corresponding values ​​of M0, it can be seen that the membrane obtained in this embodiment has higher resistance to solvent swelling, higher strength and flexibility.

[0084] The membrane is subjected to pervaporation test, the ...

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Abstract

The invention discloses a preparation method of an organosiloxane modified WPU / PVA (waterborne polyurethane / polyvinyl alcohol) film. The method comprises the following steps: synthesizing a polyurethane prepolymer by using diisocyanate, oligomer diol, carboxyl-containing micromolecular polyol and micromolecular diol as polymerization monomers; modifying the polyurethane prepolymer with organosiloxane and then carrying out quaterisation and polyamine chain extension to obtain an organosiloxane modified WPU emulsion; and mixing the organosiloxane modified WPU emulsion with a PVA aqueous solution, and then successively carrying out film coating, drying and thermal treatment to obtain the organosiloxane modified WPU / PVA film; or carrying out quaterisation and polyamine chain extension on the polyurethane prepolymer to obtain an organosiloxane modified WPU emulsion, mixing the organosiloxane modified WPU emulsion with a PVA aqueous solution, modifying with organosiloxane, and than successively carrying out film coating, drying and thermal treatment to obtain the organosiloxane modified WPU / PVA film. In the preparation process of the organosiloxane modified WPU / PVA film, the amount of organic solvents is little, thus the preparation process is clean and environmentally-friendly; and the prepared film has the characteristics of compact structure and good flexibility.

Description

1. Technical field [0001] The invention belongs to the technical field of membranes, in particular to a method for preparing organosiloxane-modified waterborne polyurethane (WPU) / polyvinyl alcohol (PVA) membranes. 2. Background technology [0002] Polyvinyl alcohol (PVA) is cheap and easy to obtain, and has good flexibility, film-forming properties, hydrophilicity, oil resistance and solvent resistance, and good physical and chemical stability. Therefore, PVA membranes are widely used in pervaporation, reverse osmosis, ultrafiltration and other aspects. However, since PVA is easily soluble in water, it generally needs to be properly modified or cross-linked before or after film formation, and researchers have made many attempts. [0003] "Journal of East China University of Science and Technology (Natural Science Edition)" 2006, Volume 32, No. 2, Page 235-240, reviewed the research progress of PVA pervaporation separation membranes, which mentioned the modification of PVA b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L75/04C08L75/08C08J5/18C08G18/32C08G18/38C08G18/12C08G18/48C08G18/83
Inventor 吴翠明姚路路崔鹏顾晶晶
Owner HEFEI UNIV OF TECH
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