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1.发明申请公开(公告)号：US20190218152A1
公开(公告)日：2019-07-18
申请号：US16180889
申请日：2018-11-05
Applicant: North University of China
Inventor： Guizhe Zhao , Yang Xiang , Yaqing Liu
CPC classification number: C05B7/00 , A01C21/00 , A01G22/00 , A01G22/20 , A01G22/22 , C05B13/00 , C05B19/00 , C05C9/02 , C05G3/0058
Abstract: The invention relates to the field of slow/controlled release fertilizer, in particular to a urea-formaldehyde-based multi-nutrient slow/controlled release fertilizer and a preparation method thereof. The urea-formaldehyde-based multi-nutrient slow/controlled release fertilizer comprises ammonium polyphosphate, inorganic silica gel and urea-formaldehyde, wherein the phosphorus-oxygen double bond of ammonium polyphosphate can at least form hydrogen bond linkage with a urea-formaldehyde molecule chain, the hydroxyl group of the inorganic silica gel can at least form hydrogen bond linkage with the urea-formaldehyde molecular chain, and ammonium polyphosphate, inorganic silica gel and urea-formaldehyde together form a hydrogen bond associated polymer network structure. The invention can prepare a urea-formaldehyde-based multi-nutrient slow/controlled release fertilizer comprising a strong hydrogen bond network structure by using a conventional aqueous solution polymerization in combination with a normal temperature extrusion granulation process, avoiding the coating process in the latter stage of the preparation of a coated fertilizer, achieving a simple and effective preparation process, and saving a lot of manpower and material resources. The urea-formaldehyde-based multi-nutrient slow/controlled release fertilizer provided by the invention can stably and continuously release nitrogen nutrient throughout the release period, thereby making up for the shortcoming of excessively long nutrient release period of the existing urea-formaldehyde fertilizers.
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公开(公告)号：US12110230B2
公开(公告)日：2024-10-08
申请号：US18430993
申请日：2024-02-02
Applicant: NORTH UNIVERSITY OF CHINA
Inventor： Yaqing Liu , Yanan Liu , Chaoyang Wu , Guizhe Zhao
IPC: C01B32/198 , C01B32/184
CPC classification number: C01B32/198 , C01B32/184 , C01P2002/01 , C01P2002/08 , C01P2002/72 , C01P2004/04 , C01P2006/40 , C01P2006/42
Abstract: An efficient microwave-assisted preparation method with one-step simultaneous reduction/embedding of a metal monatomic-doped reduced graphene oxide dielectric material. A metal salt aqueous solution is added to a graphene oxide aqueous dispersion to obtain a mixed dispersion. The mixed dispersion is mechanically stirred, such that the metal salt fully interacts with the graphene oxide, and the metal ions are uniformly loaded on a surface of the graphene oxide sheets through the interaction between metal ions and the oxygen-containing functional groups of the graphene oxide. The mixed dispersion is freeze-dried to obtain a metal salt/graphene oxide complex, which is subjected to a microwave treatment in the presence of an initiator in a microwave oven to allow reduction to obtain the metal monatomic-doped reduced graphene oxide dielectric material. An application of the metal monatomic-doped reduced graphene oxide dielectric material is also provided.
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公开(公告)号：US11745402B2
公开(公告)日：2023-09-05
申请号：US18164581
申请日：2023-02-04
Inventor： Yaqing Liu , Ruikui Du , Guizhe Zhao , Kai Wen
CPC classification number: B29C45/2606 , B29C45/1635 , B29C45/2669 , B29C45/7312 , B29L2009/00
Abstract: An injection mold for a high-aspect-ratio double-layer cylindrical plastic part and a molding method using the same. The injection mold includes a support base plate. A movable mold fixing frame and a movable mold base plate are arranged at the middle of a lower surface of the support base plate through positioning screws. A lower core mold is matchingly provided at a center of an upper surface of the support base plate, and is provided with a lower semicircular cavity for accommodating an outer die barrel. One side of the lower semicircular cavity is open, and the other side is provided with a first end wall which is provided with a lower semicircular notch for an inner die rod to pass through. An upper surface of the lower core mold is provided with a positioning protrusion, a lower feeding groove, and a remaining groove.
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4.发明授权公开(公告)号：US11597810B2
公开(公告)日：2023-03-07
申请号：US17970444
申请日：2022-10-20
Inventor： Yaqing Liu , Guizhe Zhao , Mingshan Gong , Yang Xiang
IPC: C08K3/04 , C08F120/14 , C08J3/12 , C08J3/205
Abstract: A method for continuously preparing graphene powder directly dispersed in an organic system, including: mixing an aqueous graphene oxide dispersion, an emulsifier and an oil-soluble monomer followed by pH adjustment and dispersing to obtain a pre-emulsified dispersion; subjecting the pre-emulsified dispersion to an emulsion polymerization reaction in the presence of an initiator; introducing a reducing agent to reduce graphene oxide; and subjecting the reaction mixture after emulsion polymerization to spray drying to obtain the graphene powder. Equipment used in the preparation method is also provided herein.
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公开(公告)号：US11970427B2
公开(公告)日：2024-04-30
申请号：US18499910
申请日：2023-11-01
Inventor： Yaqing Liu , Chaoyang Wu , Guizhe Zhao
Abstract: This disclosure relates to slow- and controlled-release fertilizers (S-CRF), and more particularly to a microelement amino acid chelate-urea formaldehyde (UF) slow-release fertilizer and a method for preparing the same by reactive extrusion. The microelement amino acid chelate-UF slow-release fertilizer includes a biodegradable UF polymer and a microelement amino acid chelate. The macromolecular chains of the biodegradable UF polymer interpenetrate in the cross-linked network structure of the chelate, so as to form a polymer composite with a semi-interpenetrating network structure.
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Patent Agency Ranking
公开(公告)号：US11789005B2
公开(公告)日：2023-10-17
申请号：US17581918
申请日：2022-01-22
Inventor： Yaqing Liu , Taian Chen , Yang Xiang , Guizhe Zhao
CPC classification number: G01N33/442 , C12M1/00 , C12M1/02 , C12M1/04 , C12M1/12 , G01N1/24 , G01N1/38
Abstract: A device for determining degradation rate of biodegradable polymers in soil, including a micro compressed air pump, a first CO2 absorption vessel filled with dry soda lime or an aqueous strong alkali solution, a CO2 indicator vessel filled with a barium hydroxide solution, a hollow leaching device, a second CO2 absorption vessel and a third CO2 absorption vessel connected in sequence through connecting pipes. A top of the hollow leaching device is provided with an end cover. An external water distributor filled with a leaching solution and a mechanical stirring device is arranged above the end cover. The external water distributor is in communication with an inner cavity of the hollow leaching device through a pipeline. A stirring shaft of the mechanical stirring device extends into the inner cavity. A stirring shaft is provided with a stirring paddle.
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公开(公告)号：US11732078B2
公开(公告)日：2023-08-22
申请号：US16936242
申请日：2020-07-22
Applicant: North University of China
Inventor： Yaqing Liu , Guizhe Zhao , Wei Zhang , Yang Xiang
IPC: C08F283/02 , C08G71/02
CPC classification number: C08F283/02 , C08G71/02
Abstract: The invention relates to the field of preparing biodegradable polymer slow/controlled release composite, in particular to a biodegradable polymer slow/controlled release binary composite urea-formaldehyde/poly(butylene succinate) and a biodegradable polymer slow/controlled release ternary nanocomposite urea-formaldehyde/poly(butylene succinate)/potassium dihydrogen phosphate. The following steps are included: uniformly mixing two components poly(butylene succinate) and methylol-urea or three components poly(butylene succinate), methylol-urea and potassium dihydrogen phosphate, and then extruding the resulting mixture by an extruder, and the biodegradable polymer slow/controlled release composite urea-formaldehyde/poly(butylene succinate) containing nutrient N and the biodegradable polymer slow/controlled release nanocomposite urea-formaldehyde/poly(butylene succinate)/potassium dihydrogen phosphate containing nutrients of N, P and K are obtained respectively. As one of the raw materials, methylol-urea, the precursor of urea-formaldehyde, can react by way of melt polycondensation to form urea-formaldehyde macromolecular chains with different polymerization degrees at high temperature in the extruder, which are dispersed among the PBS macromolecular chains, thereby obtaining the composite UF/PBS of the present invention; and the hindering effect of the molecular segments of urea-formaldehyde and poly(butylene succinate) and the hydrogen bond interaction between the components result in that potassium dihydrogen phosphate crystals dissolved in the water produced by the polycondensation reaction are restricted to nanoscale during their precipitation process, so as to prepare nanocomposite UF/PBS/MKP. The prepared composites all have excellent mechanical properties, and can be directly used as a biodegradable polymer slow/controlled release fertilizer, or as a matrix polymer to prepare other types of slow release fertilizers, and the formulae with high PBS contents can also replace PBS to prepare other agricultural implements, such as agricultural films, nursery pots and vegetation nets.
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公开(公告)号：US20210261709A1
公开(公告)日：2021-08-26
申请号：US16936242
申请日：2020-07-22
Applicant: North University of China
Inventor： Yaqing Liu , Guizhe Zhao , Wei Zhang , Yang Xiang
IPC: C08F283/02 , C08G71/02
Abstract: The invention relates to the field of preparing biodegradable polymer slow/controlled release composite, in particular to a biodegradable polymer slow/controlled release binary composite urea-formaldehyde/poly(butylene succinate) and a biodegradable polymer slow/controlled release ternary nanocomposite urea-formaldehyde/poly(butylene succinate)/potassium dihydrogen phosphate. The following steps are included: uniformly mixing two components poly(butylene succinate) and methylol-urea or three components poly(butylene succinate), methylol-urea and potassium dihydrogen phosphate, and then extruding the resulting mixture by an extruder, and the biodegradable polymer slow/controlled release composite urea-formaldehyde/poly(butylene succinate) containing nutrient N and the biodegradable polymer slow/controlled release nanocomposite urea-formaldehyde/poly(butylene succinate)/potassium dihydrogen phosphate containing nutrients of N, P and K are obtained respectively. As one of the raw materials, methylol-urea, the precursor of urea-formaldehyde, can react by way of melt polycondensation to form urea-formaldehyde macromolecular chains with different polymerization degrees at high temperature in the extruder, which are dispersed among the PBS macromolecular chains, thereby obtaining the composite UF/PBS of the present invention; and the hindering effect of the molecular segments of urea-formaldehyde and poly(butylene succinate) and the hydrogen bond interaction between the components result in that potassium dihydrogen phosphate crystals dissolved in the water produced by the polycondensation reaction are restricted to nanoscale during their precipitation process, so as to prepare nanocomposite UF/PBS/MKP. The prepared composites all have excellent mechanical properties, and can be directly used as a biodegradable polymer slow/controlled release fertilizer, or as a matrix polymer to prepare other types of slow release fertilizers, and the formulae with high PBS contents can also replace PBS to prepare other agricultural implements, such as agricultural films, nursery pots and vegetation nets.
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公开(公告)号：US10906843B2
公开(公告)日：2021-02-02
申请号：US16180889
申请日：2018-11-05
Applicant: North University of China
Inventor： Guizhe Zhao , Yang Xiang , Yaqing Liu
IPC: C05B7/00 , C05B13/00 , C05C9/02 , C05B19/00 , A01C21/00 , C05G5/12 , A01G22/20 , A01G22/22 , A01G22/00
Abstract: The invention relates to the field of slow/controlled release fertilizer, in particular to a urea-formaldehyde-based multi-nutrient slow/controlled release fertilizer and a preparation method thereof. The urea-formaldehyde-based multi-nutrient slow/controlled release fertilizer comprises ammonium polyphosphate, inorganic silica gel and urea-formaldehyde, wherein the phosphorus-oxygen double bond of ammonium polyphosphate can at least form hydrogen bond linkage with a urea-formaldehyde molecule chain, the hydroxyl group of the inorganic silica gel can at least form hydrogen bond linkage with the urea-formaldehyde molecular chain, and ammonium polyphosphate, inorganic silica gel and urea-formaldehyde together form a hydrogen bond associated polymer network structure. The invention can prepare a urea-formaldehyde-based multi-nutrient slow/controlled release fertilizer comprising a strong hydrogen bond network structure by using a conventional aqueous solution polymerization in combination with a normal temperature extrusion granulation process, avoiding the coating process in the latter stage of the preparation of a coated fertilizer, achieving a simple and effective preparation process, and saving a lot of manpower and material resources. The urea-formaldehyde-based multi-nutrient slow/controlled release fertilizer provided by the invention can stably and continuously release nitrogen nutrient throughout the release period, thereby making up for the shortcoming of excessively long nutrient release period of the existing urea-formaldehyde fertilizers.
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10.发明授权公开(公告)号：US09051222B1
公开(公告)日：2015-06-09
申请号：US14520107
申请日：2014-10-21
Applicant: North University of China
Inventor： Yaqing Liu , Guizhe Zhao , Dongdong Cheng , Lifeng Zhou , Denghui Wu
CPC classification number: C05B17/00
Abstract: The present invention provides a slow and controlled release polymeric sulfur fertilizer containing multiple nutrient elements. The slow and controlled release polymeric sulfur fertilizer is represented by the following formula, in which m=1-4, and n=100-210. The element sulfur in the slow and controlled release polymeric sulfur fertilizer according to embodiments of the present invention has very high utilization rate.
Abstract translation: 本发明提供了含有多种营养元素的缓释和控制释放聚合硫肥。 缓释和控释聚合硫肥由下式表示，其中m = 1-4，n = 100-210。 根据本发明实施方案的缓释和控释聚合硫肥中的元素硫具有非常高的利用率。
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