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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：US12098253B2
公开(公告)日：2024-09-24
申请号：US17831092
申请日：2022-06-02
Inventor： Yaqing Liu , Yang Xiang , Guizhe Zhao
CPC classification number: C08J3/18 , C08J3/005 , C08J2303/02 , C08J2467/02 , C08J2467/04
Abstract: A method of producing a thermoplastic starch by an in-situ reactive extrusion plasticization process and a method for preparing a starch/polymer blend by an in-situ reactive extrusion plasticization and compatibilization process. In the method, a plasticizer reaction precursor (or a plasticizing compatibilizer reaction precursor) is mixed with starch to adhere to the surface of the starch or enter the starch to break the intermolecular and intramolecular hydrogen bonds of the starch. Then a mixture of the plasticizer reaction precursor (or the plasticizing compatibilizer reaction precursor) and starch is subjected to extrusion to produce the thermoplastic starch (or the starch/polymer blend), where the reaction precursor undergoes an in-situ reaction on the surfaces of the starch and in the starch to form a macro-molecular plasticizer (or a plasticizing compatibilizer) to plasticize starch or provide plasticizing and compatibilizing effect on the starch/polymer blend.
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Patent Agency Ranking
公开(公告)号：US11732112B1
公开(公告)日：2023-08-22
申请号：US18062877
申请日：2022-12-07
Inventor： Yaqing Liu , Guizhe Zhao , Mingshan Gong
CPC classification number: C08L7/00 , C08K3/042 , C08K3/36 , C08L2310/00
Abstract: This application relates to natural rubber (NR) composites, and more specifically to a method of preparing a graphene/natural rubber composite. In the method provided herein, nano-silica loaded graphene oxide (SiO2-GO) is formed by electrostatic interaction between silica and graphene oxide (GO), and then the SiO2-GO is added to natural rubber (NR) latex to obtain a SiO2-GO/NR masterbatch by aqueous phase synergistic aggregation-precipitation process. The SiO2-GO/NR masterbatch is subjected to mechanical blending and vulcanization to obtain the graphene/NR composite.
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公开(公告)号：US11622483B2
公开(公告)日：2023-04-04
申请号：US17540584
申请日：2021-12-02
Inventor： Yaqing Liu , Hongji Duan , Guizhe Zhao
IPC: H05K9/00 , C08K3/04 , C08K3/38 , B29C39/00 , C08K9/00 , C08L75/04 , C08L83/06 , B29K75/00 , B29K83/00 , B82Y30/00 , B82Y40/00
Abstract: A gradient electrically conductive-uniform thermally conductive dual network structure-based electromagnetic shielding polymer composite with low reflection and high absorption and a preparation method thereof. The electromagnetic shielding polymer composite includes a gradient conductive carbon nanotube network with a vertically oriented cell structure and a uniformly thermally conductive hexagonal boron nitride/carbon nanotube network constructed by the hexagonal boron nitride dispersed uniformly in the carbon nanotube network and the gradient carbon nanotube network. The gradient electrically conductive carbon nanotube network and the uniformly thermally conductive hexagonal boron nitride/carbon nanotube network form a composite synergistic dual function network structure so as to make the electromagnetic shielding polymer composite have a low reflection and high absorption and excellent thermal conductivity.
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公开(公告)号：US20190031574A1
公开(公告)日：2019-01-31
申请号：US15910887
申请日：2018-03-02
Applicant: NORTH UNIVERSITY OF CHINA
Inventor： Yaqing Liu , Yang Xiang , Guizhe Zhao
IPC: C05G3/00 , C05B7/00 , C05G3/04 , C09K17/28 , C09K17/22 , C05B19/00 , C08F251/02 , C08F292/00
Abstract: This disclosure relates to water-absorbing and slow/controlled release fertilizer, in particular to a water-absorbing and water-retaining multi-nutrient biodegradable polymeric slow/controlled release fertilizer having a semi-interpenetrating network structure, and preparation methods thereof. The method can comprises the steps of: reacting formaldehyde with urea to obtain a hydroxymethyl urea solution; adding acrylic acid and acrylamide monomers into another reactor, and adding a KOH solution to adjust the neutralization degree of acrylic acid, then adding one of inorganic clay, pretreated crop straw or cellulose, then adding initiator, monopotassium phosphate and the prepared hydroxymethyl urea solution sequentially; allowing to react at temperature after being mixed uniformly to obtain a viscous product; and granulating the viscous product and oven drying the same to obtain the fertilizer. The fertilizer prepared according to the present invention has strong water-absorbing and water-retaining capacity, and an excellent slow release performance for nitrogen, phosphorus and potassium contained as nutrients.
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公开(公告)号：US12180125B2
公开(公告)日：2024-12-31
申请号：US18431971
申请日：2024-02-03
Inventor： Yaqing Liu , Yingfang Tong , Peng Gao , Guizhe Zhao
Abstract: A method for preparing a weathered coal-derived humic acid/urea-formaldehyde slow-release fertilizer granule by reactive extrusion process with depolymerization-activation-polycondensation trinity is provided. In an alkaline environment, paraformaldehyde is depolymerized into formaldehyde small molecules, which react with urea to form monohydroxymethylurea and dihydroxymethylurea. Under the strong shearing action of screws of the twin-screw reactive extruder, the macromolecular weathered coal-derived humic acid is depolymerized into relatively small molecule weathered coal-derived humic acid, and abundant active carboxyl groups are exposed, some of which immediately undergo dehydration condensation with —NH2 on the urea-formaldehyde molecule produced by the polycondensation of hydroxymethylurea during the reactive extrusion process to generate weathered coal-derived humic acid/urea-formaldehyde and its granules.
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10.发明申请公开(公告)号：US20220388923A1
公开(公告)日：2022-12-08
申请号：US17564008
申请日：2021-12-28
Applicant: North University of China
Inventor： Yaqing Liu , Taian Chen , Yunhui Guo , Guizhe Zhao , Yang Xiang
Abstract: The present invention relates to biodegradable polymers, particularly to a method for converting biodegradable polymers into humus with a low release amount of CO2 and use thereof. A composite material system is formed from the biodegradable polymers and the materials that can slowly release nutrient nitrogen or nutrients nitrogen and phosphorus, in which the mass ratio of carbon to nitrogen in the composite material system is (1-35):1. The materials of the present invention can promote the biodegradable polymers to be converted into soil humus or compost humus, rather than to be converted into greenhouse gas CO2, which is to be emitted into the atmosphere. Therefore, the method is of great significance for energy conservation and emission reduction, green and efficient utilization of biodegradable polymers and efficient and green utilization of biodegradable polymers wastes.
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