US 12,252,581 B2
Preparation method of cardanol-modified polyamine curing agent with high corrosion resistance
Qiuwei Wang, Zhejiang (CN); Qi Gu, Zhejiang (CN); Xufeng Li, Zhejiang (CN); Jian Chen, Zhejiang (CN); and Yunxing Lv, Zhejiang (CN)
Assigned to Zhejiang Wansheng Co., Ltd, Zhejiang (CN)
Filed by Zhejiang Wansheng Co., Ltd, Zhejiang (CN)
Filed on Nov. 10, 2021, as Appl. No. 17/523,886.
Application 17/523,886 is a continuation of application No. PCT/CN2021/096201, filed on May 27, 2021.
Claims priority of application No. 202010602702.2 (CN), filed on Jun. 29, 2020.
Prior Publication US 2022/0064368 A1, Mar. 3, 2022
Int. Cl. C09D 5/08 (2006.01); C07C 39/19 (2006.01); C08G 59/50 (2006.01); C09D 163/00 (2006.01)
CPC C08G 59/5033 (2013.01) [C07C 39/19 (2013.01); C09D 5/08 (2013.01); C09D 163/00 (2013.01)] 7 Claims
 
1. A preparation method of a cardanol-modified polyamine curing agent with high corrosion resistance, characterized in that the method comprises the following steps: subjecting cardanol, paraformaldehyde and an amine compound to Mannich reaction, after the Mannich reaction, adding a water-soluble initiator to initiate olefin polymerization reaction, and evaporating water and excessive amine compound under reduced pressure after the olefin polymerization reaction, thus obtaining a cardanol-modified polyamine curing agent with high corrosion resistance, wherein a temperature for the olefin polymerization reaction is 70-100° C. and a time for the olefin polymerization reaction is 3-5 h;
wherein the water-soluble initiator is an azobisisobutryamide hydrochloride, an azobisisobutryimidazoline hydrochloride, or an azoisobutyronitrile formamide, and a feed amount of the water-soluble initiator is 1-5% mass of the cardanol;
wherein, the cardanol has the following structural formula:

OG Complex Work Unit Chemistry