Image forming method and ink set
An image forming method includes: applying an ink containing a pigment and resin particles onto a fabric by an inkjet method; and applying a post-treatment liquid containing a lubricant onto the ink applied to the fabric in a wet-on-wet manner, wherein when a solubility parameter of a resin constituting the resin particles is represented by SP 1 (cal/cm 3 ) 1/2 and a solubility parameter of the lubricant is represented by SP 2 (cal/cm 3 ) 1/2 , 0.3≤SP 1 −SP 2 ≤0.8 is satisfied.
1. An image forming method comprising:
applying an ink containing a pigment and resin particles onto a fabric by an inkjet method; and
applying a post-treatment liquid containing a lubricant onto the ink applied to the fabric in a wet-on-wet manner, wherein
when a solubility parameter of a resin constituting the resin particles is represented by SP 1 (cal/cm 3 ) 1/2 and a solubility parameter of the lubricant is represented by SP 2 (cal/cm 3 ) 1/2 , 0.3≤SP 1 −SP 2 ≤0.8 is satisfied.
2. The image forming method according to claim 1 , wherein
the resin particles contain a (meth)acrylic resin.
3. The image forming method according to claim 2 , wherein
the (meth)acrylic resin further has a crosslinkable group, and
at least one of the ink and the post-treatment liquid contains a crosslinking agent that reacts with the crosslinkable group.
4. The image forming method according to claim 3 , wherein
a content mass of the crosslinking agent in the ink is larger than a content mass of the crosslinking agent in the post-treatment liquid.
5. The image forming method according to claim 1 , wherein
the lubricant contains a silicone-based resin.
6. The image forming method according to claim 5 , wherein
the silicone-based resin is a silicone acrylic copolymer.
7. The image forming method according to claim 1 , wherein
a surface tension of each of the ink and the post-treatment liquid at 25° C. is 36 to 50 mN/m.
8. The image forming method according to claim 1 , wherein
in a state where a surface temperature of the fabric is 40° C. or lower, a time from application of the ink to start of application of the post-treatment liquid is 0.1 to five seconds.
9. The image forming method according to claim 1 , wherein
the fabric contains a hydrophobic fiber and a hydrophilic fiber.
10. An ink set for inkjet textile printing, comprising:
an ink containing a pigment and resin particles; and
a post-treatment liquid containing a lubricant, wherein
when a solubility parameter of a resin constituting the resin particles is represented by SP 1 (cal/cm 3 ) 1/2 and a solubility parameter of the lubricant is represented by SP 2 (cal/cm 3 ) 1/2 , 0.3≤SP 1 −SP 2 ≤0.8 is satisfied, and
a surface tension of each of the ink and the post-treatment liquid at 25° C. is 36 to 50 mN/m.
11. The ink set according to claim 10 , wherein
the resin particles contain a (meth)acrylic resin, and
the lubricant contains a silicone acrylic copolymer.
12. The image forming method according to claim 1 , wherein the step of applying a post-treatment liquid containing a lubricant onto the ink applied to the fabric in a wet-on-wet manner includes applying the post-treatment liquid when the following is satisfied:
(an amount of liquid ink remaining without being dried when the post-treatment liquid is applied)/(the adhesion amount of the ink) is 0.4 to 1.0.
13. The image forming method according to claim 1 , wherein the lubricant of the post treatment liquid contains a silicone-based resin, and the post-treatment liquid further includes an acrylic resin.