Crosslinkable polyvinyl acetal porous powder, method for producing the same, and use of the same
A polyvinyl acetal and cross-linking technology, applied in powder coatings, polyurea/polyurethane coatings, epoxy resin coatings, etc., to achieve excellent solvent solubility and excellent cleaning performance
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[0061] According to the production method of the present invention, since the reaction is carried out in a solvent that does not dissolve the raw material polyvinyl acetal porous powder and the generated cross-linkable polyvinyl acetal porous powder, the raw material cross-linkable polyvinyl acetal powder is hardly changed. The average particle size and bulk density of the porous polyvinyl acetal powder can be used to obtain the porous polyvinyl acetal powder.
[0062] Therefore, it is preferable to use polyvinyl acetal porous powder having an average particle diameter of 30 to 10000 μm and a bulk density of 0.12 to 0.50 g / ml as the raw material polyvinyl acetal porous powder. The average particle diameter of the raw polyvinyl acetal porous powder is preferably 30 to 1000 μm, more preferably 30 to 300 μm. In addition, the bulk density of the raw material polyvinyl acetal porous powder is preferably 0.12 to 0.40 g / ml, more preferably 0.12 to 0.30 g / ml.
[0063] The degree of p...
Embodiment 1
[0129] (Preparation of polyvinyl butyral porous powder)
[0130] In a 5L (liter) glass container with a reflux cooler, a thermometer, and an anchor type stirring blade, add 4050 g of ion-exchanged water, 330 g of polyvinyl alcohol (PVA-1) (1700 degree of polymerization, 98 mol % of saponification degree) (PVA Concentration 7.5%), the content was heated to 95 ° C to completely dissolve. Then, after cooling slowly to 10 degreeC over about 30 minutes with stirring of 120 rpm, 192 g of butyraldehyde and 270 mL of 20% hydrochloric acid were added, and the butyralization reaction was performed for 150 minutes. Then, the temperature was raised to 50° C. over 60 minutes, and it was kept at 50° C. for 120 minutes, and then cooled to room temperature. After the precipitated resin was washed with ion-exchanged water, an excess sodium hydroxide aqueous solution was added, washed again, and dried to obtain a polyvinyl butyral porous powder (PVB-1). The obtained PVB-1 had a butyralization...
Embodiment 2
[0175] Use polyvinyl alcohol (PVA-2) (polymerization degree 500, saponification degree 98 mol%) instead of polyvinyl alcohol (PVA-1) in Example 1, change the temperature during cooling to 3 ° C, in addition It carried out similarly to Example 1, and obtained the polyvinyl butyral porous powder (PVB-2).
[0176] Use PVB-2 instead of PVB-1, use 950 g of hexane, 50 g of MEK, and use 14.7 g (4.8 mol %) of maleic anhydride, and perform the same operation as in Example 1 to obtain a cross-linkable polymer. Vinyl butyral porous powder 2.
[0177] Then, using the crosslinkable polyvinyl butyral porous powder 2, it carried out similarly to Example 1, and produced the cured film.
[0178] Table 1 and Table 2 show the results of measurement and evaluation of the crosslinkable polyvinyl butyral porous powder 2 and the results of evaluation of the cured film by the same method as in Example 1. .
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