Polypropylene composite powder for selective laser sintering and preparation method thereof

A laser sintering and composite powder technology, which is applied in the field of polymer materials, can solve the problems of easy extrusion and crushing, affecting flame retardancy and heat resistance, and achieves the effects of improving bonding force, improving mechanical properties, and improving production efficiency

CN111995819APending Publication Date: 2020-11-27OECHSLER PLASTIC PROD TAICANG +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-11-27

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Abstract

The invention provides polypropylene composite powder for selective laser sintering and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing an ionicliquid modified hollow glass bead material, and then mechanically blending the modified hollow glass beads with SLS polypropylene raw material powder to obtain the composite powder. According to the hollow glass beads modified by ionic liquid, binding force with the PP matrix and the dispersity in the PP matrix are obviously improved, the ionic liquid plays a heterogeneous nucleation role in the PP composite powder, the PP crystallization process can be accelerated, PP spherocrystals are smaller in size and more uniform, and therefore, buckling deformation of PP in the SLS sintering process isimproved. The SLS polypropylene composite powder obtained by mechanically blending the modified hollow glass beads with commercially available PP raw material powder for SLS molding has good SLS molding process performance, and the product has good mechanical properties, heat resistance and flame retardancy. The composite powder is simple and efficient in production process, low in cost and suitable for large-scale production.
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Description

technical field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polypropylene composite powder used for selective laser sintering. Background technique

[0002] Selective laser sintering (SLS) is a kind of additive manufacturing 3D printing technology. It mainly uses powder materials as the base material, and can prepare composite material functional parts or investment casting parts with complex structures. It has fast molding speed and high precision. Advanced features, widely used in aerospace, biomedical, automobile manufacturing and other fields.

[0003] SLS raw materials come from a wide range of sources, including metal powders, ceramic-based powders, and polymer material powders. Among them, polymer material powders have relatively low requirements for additive manufacturing equipment due to their relatively low price, and are easy to modify and process. And other advantages have become the main raw material ...

Examples

Embodiment 1

[0035] (1) 60 parts by mass of hollow glass microspheres not modified by ionic liquid, 100 parts by mass of PP powder, 4 parts by mass of flow aid, and 2 parts by mass of antioxidant are added to a high-speed mixer and heated at 1200r / min Mix for 15 minutes to obtain PP composite powder.

[0036] (2) SLS forming standard splines, set SLS process parameters, preheating temperature 150°C, scanning distance 0.15mm, laser power 20W, powder coating thickness 0.12mm, scanning speed 10000mm / s.

[0037](3) Carry out relevant test performance on the standard sample bar formed by SLS, among which, the tensile test is carried out according to GB / T1040.3-2006, the bending test is carried out according to GB / T9341-2008, and the Charpy impact test is carried out according to GB / T1043. 1-2008, heat distortion temperature according to GB / T1634-2004, limiting oxygen index test according to GB / T2406.2-2009, horizontal and vertical combustion test according to GB / T2408-2008.

Embodiment 2

[0039] (1) 20 parts by mass of hollow glass microspheres modified by 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid, 100 parts by mass of PP powder, 4 parts by mass of flow aid, 2 parts by mass of antioxidant The parts by mass were added into a high-speed mixer, and mixed at 1200r / min for 15min to obtain PP composite powder.

[0040] (2) SLS forming standard splines, set SLS process parameters, preheating temperature 150°C, scanning distance 0.15mm, laser power 20W, powder coating thickness 0.12mm, scanning speed 10000mm / s.

[0041] (3) Carry out relevant test performance on the standard sample bar formed by SLS, among which, the tensile test is carried out according to GB / T1040.3-2006, the bending test is carried out according to GB / T9341-2008, and the Charpy impact test is carried out according to GB / T1043. 1-2008, heat distortion temperature according to GB / T1634-2004, limiting oxygen index test according to GB / T2406.2-2009, horizontal and vertical combustion ...

Embodiment 3

[0043] (1) 40 parts by mass of hollow glass microspheres modified by 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid, 100 parts by mass of PP powder, 4 parts by mass of flow aid, 2 parts by mass of antioxidant The parts by mass were added into a high-speed mixer, and mixed at 1200r / min for 15min to obtain PP composite powder.

[0044] (2) SLS forming standard splines, set SLS process parameters, preheating temperature 150°C, scanning distance 0.15mm, laser power 20W, powder coating thickness 0.12mm, scanning speed 10000mm / s.

[0045] (3) Carry out relevant test performance on the standard sample bar formed by SLS, among which, the tensile test is carried out according to GB / T1040.3-2006, the bending test is carried out according to GB / T9341-2008, and the Charpy impact test is carried out according to GB / T1043. 1-2008, heat distortion temperature according to GB / T1634-2004, limiting oxygen index test according to GB / T2406.2-2009, horizontal and vertical combustion ...