US 11,926,757 B2
Quick-drying solvent-free sag-resistant polyurethane waterproof coating and preparation method therefor
Xiaogang He, Suzhou (CN); and Zhongren Li, Suzhou (CN)
Assigned to JIANGSU CANLON BUILDING MATERIALS CO., LTD., Suzhou (CN)
Appl. No. 17/271,959
Filed by JIANGSU CANLON BUILDING MATERIALS CO., LTD., Suzhou (CN)
PCT Filed Aug. 6, 2019, PCT No. PCT/CN2019/099409
§ 371(c)(1), (2) Date Feb. 26, 2021,
PCT Pub. No. WO2020/042877, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 201810994164.9 (CN), filed on Aug. 29, 2018.
Prior Publication US 2021/0324231 A1, Oct. 21, 2021
Int. Cl. C09D 175/08 (2006.01); C08G 18/10 (2006.01); C08G 18/12 (2006.01); C08G 18/18 (2006.01); C08G 18/48 (2006.01); C09D 7/20 (2018.01); C09D 7/61 (2018.01); C09D 7/63 (2018.01)
CPC C09D 175/08 (2013.01) [C08G 18/10 (2013.01); C08G 18/12 (2013.01); C08G 18/1808 (2013.01); C08G 18/4808 (2013.01); C08G 18/4812 (2013.01); C09D 7/20 (2018.01); C09D 7/61 (2018.01); C09D 7/63 (2018.01)] 11 Claims
 
1. A quick-drying solvent-free sag-resistant polyurethane waterproof coating, wherein its raw materials comprises a polyurethane prepolymer, a plasticizer, a dispersing agent, a filler, a dehydrating agent, a catalyst and a defoaming agent, the raw materials further comprise an oxazolidine reactive diluent that accounts for 1-10% by mass of the raw materials, the catalyst is composed of pentamethyl dipropylidene triamine, tetramethylethylenediamine, and 1,8-diazacyclo[5,4,0]undecene, and a feed mass ratio of pentamethyl dipropylidene triamine, tetramethylethylenediamine, and 1,1,8-diazabicyclo[5,4,0]undecane is (0.5-5):(0.5-3): 1; wherein, raw materials of the polyurethane prepolymer comprise a polyether diol, a polyether triol, an isocyanate, and a chain extender, and the prepolymer is prepared by the following method:
(1) taking the raw materials of the polyurethane prepolymer, and reacting the polyether diol with the isocyanate until reaction completion;
(2) adding the polyether triol to reacted materials in Step (1), and reacting until reaction completion; and
(3) adding the chain extender to reacted materials in Step (2) and reacting, to prepare the polyurethane prepolymer.