Polyisocyanate curing agent, aqueous coating composition, coating film, and coated article
A technology of polyisocyanate and diisocyanate, which is applied in the field of water-based coating composition, polyisocyanate curing agent, coating film and coatings, can solve the problems such as polyisocyanate is difficult to disperse, and achieve good water dispersibility and good elongation Effect
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[0131] Hereinafter, specific examples and comparative examples are given to describe this embodiment in more detail, but this embodiment is not limited to the following examples and comparative examples unless the gist is exceeded. The physical properties of the polyisocyanate curing agents in Examples and Comparative Examples were measured as follows. In addition, unless otherwise specified, "part" and "%" mean "part by mass" and "% by mass".
[0132]
[0133] The polyisocyanate curing agent was used as a sample, and the measurement of the isocyanate group content was carried out in accordance with the method described in JIS K7301-1995 (Testing methods for toluene diisocyanate prepolymers for thermosetting polyurethane elastomers). Hereinafter, a more specific measuring method of the isocyanate group content rate will be shown.
[0134] (1) Take 1 g of a sample in a 200 mL Erlenmeyer flask, and add 20 mL of toluene to this flask to dissolve the sample.
[0135](2) Next, ...
manufacture example 1
[0188] [Production example 1] Production of raw material polyisocyanate A-1
[0189] The interior of the four-necked flask equipped with a stirrer, a thermometer, a reflux condenser, a nitrogen blowing tube, and a dropping funnel was replaced with nitrogen, and 792.4 g of hexamethylene diisocyanate and Placcel 305 (polycaprolactone polyol, manufactured by Daicel) were added. , number average molecular weight 550, hydroxyl value 305 mgKOH / g, described as "305" in the following Table 1) 115.3 g, reacted at 100 degreeC under stirring for 1 hour.
[0190] The obtained reaction solution was filtered with a PTFE filter (trade name: T300A090C, manufactured by Advantec Corporation) having a pore diameter of 3 μm. Using a thin-film evaporator, it was purified twice under the conditions of 160° C. and 0.2 Torr to remove unreacted hexamethylene diisocyanate to obtain raw material polyisocyanate A-1. The isocyanate group content rate of the obtained raw material polyisocyanate A-1 was 11...
manufacture example 2～5、7、8
[0191] [Manufacture examples 2-5, 7, 8] Production of raw material polyisocyanate A-2-A-5, A-7, A-8
[0192] It manufactured by the method similar to the manufacture example 1 except having mixed and reacted various polyester polyols and hexamethylene diisocyanate which differ in number average molecular value as shown in Table 1. The obtained raw material polyisocyanates A-2 to A-5 and A-7 to A-8 had the isocyanate group content and viscosity described in Table 1.
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