Crosslinkable polyvinyl acetal porous powder, method for producing the same, and use of the same
A polyvinyl acetal and porous technology, applied in powder coatings, polyurea/polyurethane coatings, epoxy resin coatings, etc., to achieve excellent cleaning performance and excellent solvent solubility
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[0061] According to the preparation 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 resulting cross-linkable polyvinyl acetal porous powder, the raw material polyvinyl acetal is hardly changed. The average particle size and bulk density of the porous powder can be cross-linked polyvinyl acetal porous powder.
[0062] Therefore, it is preferable to use a polyvinyl acetal porous powder having an average particle diameter of 30 to 10,000 μm and a bulk density of 0.12 to 0.50 g / ml as the raw material. The average particle size of the raw material 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, and more preferably 0.12 to 0.30 g / ml.
[0063] The raw material polyvinyl acetal porous powder (polyvinyl alcohol) preferably has ...
Embodiment 1
[0129] (Preparation of porous polyvinyl butyral powder)
[0130] Into a 5L (liter) glass container with a reflux cooler, a thermometer, and an anchor-type stirring blade, add 4050g of ion-exchanged water, polyvinyl alcohol (PVA-1) (polymerization degree 1700, saponification degree 98mol%) 330g (PVA Concentration 7.5%), the contents are heated to 95°C to completely dissolve. Then, after slowly cooling to 10°C over about 30 minutes under stirring at 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, it heated up to 50 degreeC over 60 minutes, after maintaining at 50 degreeC for 120 minutes, it 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 polyvinyl butyral porous powder (PVB-1). The degree of butyralization of the obtained PVB-1 was 69 mol%, the con...
Embodiment 2
[0175] Use polyvinyl alcohol (PVA-2) (polymerization degree 500, saponification degree 98 mol%) instead of polyvinyl alcohol (PVA-1) in Example 1, and change the temperature during cooling to 3°C. The operation was carried out in the same manner as in Example 1 to obtain polyvinyl butyral porous powder (PVB-2).
[0176] PVB-2 was used instead of PVB-1, 950 g of hexane, 50 g of MEK, and 14.7 g (4.8 mol%) of maleic anhydride were used, except that the operation was performed in the same manner as in Example 1 to obtain a crosslinkable polymer. Vinyl butyral porous powder 2.
[0177] Then, the crosslinkable polyvinyl butyral porous powder 2 was used in the same manner as in Example 1 to produce a cured film.
[0178] The results of the measurement and evaluation of the cross-linkable polyvinyl butyral porous powder 2 and the results of the evaluation of the cured film by the same method as in Example 1 are shown in Tables 1 and 2 .
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