US 12,473,423 B2
Organic phosphorous compound flame retardant, preparation method and applications thereof
Fanxu Meng, Shandong (CN); Renchun Tian, Shandong (CN); Huanyang Du, Shandong (CN); Haoliang Xu, Shandong (CN); and Jun Zheng, Shandong (CN)
Assigned to WEIHAI HELEN NEW-MATERIAL TECH CO., LTD., Shandong (CN)
Filed by WEIHAI HELEN NEW-MATERIAL TECH CO., LTD., Shandong (CN)
Filed on Jun. 17, 2022, as Appl. No. 17/842,808.
Application 17/842,808 is a continuation of application No. PCT/CN2020/092876, filed on May 28, 2020.
Claims priority of application No. 202010014139.7 (CN), filed on Jan. 7, 2020.
Prior Publication US 2022/0325074 A1, Oct. 13, 2022
Int. Cl. C08K 5/5313 (2006.01); C07F 9/30 (2006.01); C08K 7/14 (2006.01)
CPC C08K 5/5313 (2013.01) [C07F 9/301 (2013.01); C08K 2201/005 (2013.01)] 3 Claims
 
1. A preparation method for organic phosphorus compound flame retardant, wherein the preparation method for organic phosphorus compound flame retardant comprises the following steps:
first drop-wise adding at least one from the water-soluble salts of alkyl phosphorous acid or water-soluble salts of phosphorous acid into a solution of water-soluble non-halogen II˜IV valent metal salt to react and obtain a clear aqueous solution, then continuing to drop-wise at least one from the water-soluble salts of di-alkyl hypophosphorous acid or water-soluble salts of mono-alkyl hypophosphorous acid into the obtained clear aqueous solution, the adding ratios of various substances are as follows: the molar mass ratio between the total di-alkyl hypophosphite or mono-alkyl hypophosphite versus the total alkyl phosphite or phosphite is 1˜10, the molar mass ratio between the total metal ions versus the total di-alkyl hypophosphite or mono-alkyl hypophosphite and alkyl phosphite or phosphite is 0.01˜0.5, reaction temperature controlled to 0° C.˜90° C., then continuing to agitate them 0˜10 hours after the adding ended, finally filtering, washing, drying and comminuting the yielded turbid solution to obtain compound salt particles having a grain size of 0.001 μm to 100 μm, that is, the organic phosphorus compound flame retardant described above, wherein
the structural formula (3) of the organic phosphorous compound flame retardants described above is:

OG Complex Work Unit Chemistry
wherein: in the structural formula (3), the R1 and R2 are the same or not, and both at least one selected from hydrogen, saturated alkyl groups of C1˜C6, aralkyl groups of C7˜C18 or alkaryl groups of C7˜C18, one or more rings between them; the R3 is at least one selected from hydrogen, saturated alkyl groups of C1˜C6, alkyl naphthenic group of C3˜C18, aralkyl groups of C7˜C18 or alkaryl groups of C7˜C18; M is a II˜IV valent metal element, m is 2˜4, x and y are both positive numbers of no less than 0.01 but no more than 10, including but not limited to a positive integer.