US 11,806,892 B2
No-added formaldehyde binder for composite wood product and the composite wood product manufactured by the same
Song Tu, Shandong (CN); Wangshun Qi, Shandong (CN); Houyi Li, Shandong (CN); Weihua Sun, Shandong (CN); Zijun Zhang, Shandong (CN); and Bing Lv, Shandong (CN)
Assigned to Wanhua Chemical Group Co., Ltd.
Appl. No. 16/612,847
Filed by Wanhua Chemical Group Co., Ltd., Shandong (CN)
PCT Filed Jun. 20, 2017, PCT No. PCT/CN2017/089126
§ 371(c)(1), (2) Date Nov. 12, 2019,
PCT Pub. No. WO2018/227645, PCT Pub. Date Dec. 20, 2018.
Claims priority of application No. 201710447741.8 (CN), filed on Jun. 14, 2017.
Prior Publication US 2020/0198176 A1, Jun. 25, 2020
Int. Cl. C08G 18/32 (2006.01); B27N 3/00 (2006.01); C08G 18/34 (2006.01); C08G 18/42 (2006.01); C08G 18/67 (2006.01); C08G 18/73 (2006.01); C08G 18/75 (2006.01); C08L 75/06 (2006.01); C09J 175/06 (2006.01)
CPC B27N 3/002 (2013.01) [C08G 18/3206 (2013.01); C08G 18/348 (2013.01); C08G 18/4277 (2013.01); C08G 18/672 (2013.01); C08G 18/73 (2013.01); C08G 18/755 (2013.01); C08G 18/758 (2013.01); C08L 75/06 (2013.01); C09J 175/06 (2013.01); C08L 2201/54 (2013.01)] 18 Claims
 
1. A no-added formaldehyde composite wood product binder, comprising agent A and agent B, wherein the agent A is an isocyanate binder, and the agent B is an aqueous dispersion of a polyester-based aliphatic polyurethane and/or a modified polyester-based aliphatic polyurethane;
wherein the modified polyester-based aliphatic polyurethane is the polyester-based aliphatic polyurethane modified with a polymerizable vinyl monomer based polymer, which is obtained by chemically bonding of the polyester-based aliphatic polyurethane with a polymer of polymerizable vinyl monomers;
wherein the isocyanate binder as agent A is a polymethylene polyphenyl polyisocyanate and/or a derivative thereof, and has a NCO value of 20-33%, a functionality of 2.1-3.3, and a viscosity of 50-2000 cp (25° C.); the derivative of the polymethylene polyphenyl polyisocyanate is obtained by reacting a polymethylene polyphenyl polyisocyanate with a polyol;
wherein the polyester-based aliphatic polyurethane in the aqueous dispersion of a polyester-based aliphatic polyurethane as agent B has a number average molecular weight of 50000 to 500000 Dalton, and a glass transition temperature of −30° C.-5° C.;
wherein the weight ratio of agent A to agent B is 1-5:1;
wherein the aqueous dispersion of a polyester-based aliphatic polyurethane and/or a modified polyester-based aliphatic polyurethane as agent B has a solid content of 20 to 60 wt %.