Chinese Academy of Sciences

Jinyong Dong

Jian Xu

Xuechun Lin

Wenhua Sun

Chuncheng Li

Wenxin Fu

Yongmei Ma

Yawei Qin

Ning Zhao

Kun Zheng

Jing Guo

Zhiyan Zhang

Xinyu Cao

Haijuan Yu

Dujin Wang

Heng Shen

Jingnan Zhang

Fusong Wang

Tang Zhu

Wenting Wang

Shusen Zhao

Jiguang Liu

Hui Niu

Zhichao Han

This invention relates to a high molecular weight nylon powder composition for 3D printing, its preparation method and use. The composition comprises: 100 parts by weight of high-viscosity nylon powder, 1-5 parts by weight of a flow agent, and 0.1-1 parts by weight of an antioxidant; the high-viscosity nylon powder is one or more selected from nylon 6, nylon 66, nylon 11, nylon 12, nylon 612 and nylon 610; or the powder composition is obtained via polymerization reaction of the raw materials comprising the following components, based on the weight parts of lactam monomers or amide monomers: 100 parts by weight of lactam monomers or amide monomers, 0.005-1 parts by weight of a catalyst, and 0.1-1 parts by weight of an antioxidant. The high molecular weight nylon powder composition prepared in the present invention has a particle diameter in the range of 20-100 micrometers, good powder spreading performance, and is suitable for the 3D printing process, and the product of the high molecular weight nylon powder composition has good mechanical properties, good dimensional stability and low manufacturing cost.

Nylon powder composition for 3D printing, and preparation method and application thereof

The present invention provides a composition for 3D printing, a process for preparing the same and an article thereof. By the solidifying method of UV irradiation, 3D printing is implemented. During said implementation, there is no need of high temperature heating, thus energy consumption is reduced, and there is no need for special solvent, thus harm to the environment is reduced. Meanwhile, the present invention uses micro-nano powder as the main material and polymer resin as adhesive, and at the same time, adds irradiation sensitizer. After electron beam irradiation, the polymer resin forms three-dimensional crosslinked network, thereby the strength, heat resistance and chemical resistance are improved after resin adhesion. Additionally, the present invention, by the addition of UV crosslinking agent, and by UV irradiation, cross-links the unsaturated resin after extrusion in 3D printing to form three-dimensional network structure, thus greatly improves the heat resistance, chemical resistance and mechanical strength of the shaping material, and makes the unsaturated resin have broader application prospects in 3D printing material.

Material for 3D printing, process for preparing the same and article thereof

Provided are use of organosilane, and polyolefin resin and preparation method thereof. The method of preparing the polyolefin resin comprises: conducting olefin polymerization of olefin monomers in the presence of a catalyst, and adding organosilane to a polymerization system before the olefin polymerization and/or during the olefin polymerization, wherein the organosilane is represented by a general formula of RSiX(OR), wherein Ris a C-Calkyl, and a terminal of Rhas an &#x3b1;-olefin double bond, a norbornene group, a cycloalkene group, or a dicyclopentadiene group; X is a halogen element; Ris a C-Cstraight chain, a C-Cbranched chain, or an isomerized alkyl group; m is an integer from 1-3; n is an integer from 1-3; k is an integer from 0-2; and m, n, and k satisfy the following condition: m+n+k=4. The polyolefin resin obtained by the above method has higher melt strength and mechanical strength.

Use of organosilane, and polyolefin resin and preparation method thereof

The present invention provides modified olefin polymerization catalyst, preparation method thereof, olefin polymerization catalyst system, use thereof and method of preparing polyolefin resin. The catalyst comprises an olefin polymerization catalyst and an organosilane, which is represented by a general formula RSiX(OR), where Ris a C-Calkyl group and a terminal of Rhas an &#x3b1;-olefin double bond, a norbornene group, a cycloolefin group or a dicyclopentadiene group, X is a halogen element, Ris a C-Clinear chain, branched chain or isomerized alkyl group, m is an integer from 1-3, n is an integer from 1-3, k is an integer within a range of 0-2, and m+n+k=4. High-performance polyolefin resins, including homopolymerized polyolefin resin with high melt and mechanical strength, polyolefin elastomer with high rubber phase content, and polyolefin elastomer with a rubber phase in a crosslinked structure, etc., can be obtained through polymerization with the catalyst.

Olefin polymerization catalyst, preparation method thereof, olefin polymerization catalyst system, use thereof, and method of preparing polyolefin resin

Provided are use of organosilane, in-reactor polyolefin alloy and preparation method thereof. The method of preparing an in-reactor polyolefin alloy comprises: conducting the first polymerization reaction of the first olefin monomer in the presence of a catalyst, and then charging the second olefin monomer into the polymerization reaction system to perform the second polymerization reaction, wherein the first olefin monomer is different from the second olefin monomer, wherein the first polymerization reaction and/or the second polymerization reaction are/is executed in the presence of organosilane represented by a general formula RSiX(OR), wherein Ris a C-Calkyl; a terminal of Rhas an &#x3b1;-olefin double bond, a norbornene group, a cycloalkene group, or a dicyclopentadiene group; X is a halogen element; Ris a C-Cstraight chain, a C-Cbranched chain, or an isomerized alkyl group; m is an integer from 1-3; n is an integer from 1-3; k is an integer from 0-2; and m, n, and k satisfy the following condition: m+n+k=4. The in-reactor polyolefin alloy obtained by the above method has a high degree of crosslinking in a rubber phase, high impact resistance, and low tensile strength at break.

Use of organosilane, in-reactor polyolefin alloy and preparation method thereof

An ultraviolet laser 3D printing device includes a thermostat, a laser head, a non-contact type temperature monitoring device, a scanning galvanometer, a processing platform, a powder laying device, a material to be processed, a computer control system. The device is configured to perform the following functions: presetting a processing temperature by the control system; during the processing procedure, the temperature rise condition of the processed object is monitored by the non-contact type temperature monitoring device and fed back in real time to the control system; and by recording the rise value of the temperature within a certain period, the system can obtain the absorption capability of the laser and the temperature rise degree of the processed material, so that the laser output power can be calculated according to the preset processing temperature value, and the laser power can be adjusted in real time to precisely control the processing temperature.

Ultraviolet laser 3D printing method for precise temperature control of polymer material and device thereof

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Beijing, China

Jinyong Dong