Cement-based composite material for powder-bonding three-dimensional (3D) printing, and powder-bonding 3D printing method applying cement-based composite material

Abstract

The invention provides a cement-based composite material for powder-bonding three-dimensional (3D) printing. The material is prepared from the following components in parts by weight: 1 part of cement, 0-5 parts of sand, 0-5 parts of a mineral admixture, 0-0.2 part of an expanding agent, 0-0.2 part of a toughening agent, 0-0.2 part of mineral pigment, 0.1-0.5 part of water, 0-0.25 part of polymer emulsion, 0.001-0.05 part of an additive and 0-0.03 part of fibers, wherein the cement is selected from one or a mixture of more in silicate cements, sulphoaluminate cement, high belite sulphoaluminate cement, aluminate cement, fluoroaluminate cement, aluminosilicate cement, phosphate cement or magnesium oxide cement; the additive is selected from one or a mixture of more in a water reducing agent, an early strength agent or a coagulating regulating agent. After being contacted with water, the cement-based composite material can be hardened, thus not needing a great deal of polymer adhesive; the cement-based composite material is rapid and controllable in hardening speed; the cement-based composite material is small in deformation in the hardening process, thus being suitable for a powder-bonding 3D printing technology. The invention also provides a method for carrying out powder-bonding 3D printing by using the cement-based composite material.

Description

technical field

[0001] The invention belongs to the field of inorganic materials, and in particular relates to a cement-based composite material that can be used in a powder bonding 3D printing process, and a powder bonding 3D printing method using the material. Background technique

[0002] Additive Manufacturing (Additive Manufacturing) technology is a technology that uses the method of gradually accumulating materials to manufacture solid parts, also known as Rapid Prototyping or Rapid Manufacturing technology. Since the rise of the 1980s, additive manufacturing has developed rapidly and has been hailed as a major innovation and progress in the field of material manufacturing, and is also considered "one of the important symbols of the third industrial revolution".

[0003] Additive manufacturing can be realized through a variety of processes and different materials, among which powder bonded 3D printing technology (threedimensional printing or powder bed and inkjet 3D pr...

Examples

Embodiment 1

[0060] The weight ratio of Portland cement, silica fume, calcium sulfoaluminate expansion agent, water, calcium formate early strength agent, and polycarboxylate superplasticizer is 1:0.07:0.05:0.26:0.02:0.03. This material is suitable for printing objects with high precision and high strength.

[0061] Add the weighed Portland cement, silica fume, calcium sulfoaluminate expansion agent, and calcium formate early strength agent into the ball mill, and mix for 15 minutes to make a uniform powder material. Using a 3D printer, first spread a layer of 0.5mm thick powder material evenly, and then spray water in the preset area of ​​the powder material layer in proportion; repeat the above process to carry out molding.

[0062]At a room temperature of 15°C to 30°C, the printed object can be hardened within 0.5 hours after printing, and has sufficient strength for powder removal. Sealed and cured at 20°C, the compressive strengths at 3 days and 28 days were 58MPa and 127MPa, and the...

Embodiment 2

[0066] The weight ratio of high belite sulfoaluminate cement, limestone powder, water, lithium carbonate and citric acid is 1:0.25:0.5:0.002:0.001. This material is suitable for printing objects with high precision and fast forming.

[0067] Add the weighed high belite sulfoaluminate cement, limestone powder, lithium carbonate, and citric acid into the ball mill, and mix for 15 minutes to make a uniform powder material. Using a 3D printer, first spread a layer of 0.5mm thick powder material evenly, and then spray water in the preset area of ​​the powder material layer in proportion; repeat the above process to carry out molding.

[0068] At a room temperature of 15°C to 30°C, the printed object can be hardened within 20 minutes after printing, and has enough strength to remove powder. Sealed and cured at 20°C, the 1-day and 3-day compressive strengths were 29MPa and 51MPa, respectively, and the 3-day and 28-day flexural strengths were 4.9MPa and 7.1MPa, respectively.

Embodiment 3

[0072] The weight ratio of Portland cement, sulfoaluminate cement, granulated blast furnace slag powder, water, styrene-butadiene latex, and polycarboxylate superplasticizer is 1:0.05:0.45:0.26:0.22:0.01, and the weight ratio of styrene-butadiene latex The solid content is 50%. This material is suitable for objects with high printing accuracy and high deformation requirements.

[0073] Add the weighed portland cement, sulphoaluminate cement, and granulated blast furnace slag powder into the ball mill, and mix for 15 minutes to make a uniform powder material. Add the weighed styrene-butadiene latex into water and stir for 5 minutes to make a uniform liquid phase material. Using a 3D printer, first spread a layer of 0.5mm thick powder material evenly, and then spray the liquid phase material in the preset area of ​​the powder material layer in proportion; repeat the above process to carry out molding.

[0074] After printing, it was sealed and cured at 20°C. The compressive st...

technical field

[0001] The invention belongs to the field of inorganic materials, and in particular relates to a cement-based composite material that can be used in a powder bonding 3D printing process, and a powder bonding 3D printing method using the material. Background technique

[0002] Additive Manufacturing (Additive Manufacturing) technology is a technology that uses the method of gradually accumulating materials to manufacture solid parts, also known as Rapid Prototyping or Rapid Manufacturing technology. Since the rise of the 1980s, additive manufacturing has developed rapidly and has been hailed as a major innovation and progress in the field of material manufacturing, and is also considered "one of the important symbols of the third industrial revolution".

[0003] Additive manufacturing can be realized through a variety of processes and different materials, among which powder bonded 3D printing technology (threedimensional printing or powder bed and inkjet 3D pr...

Examples

Embodiment 1

[0060] The weight ratio of Portland cement, silica fume, calcium sulfoaluminate expansion agent, water, calcium formate early strength agent, and polycarboxylate superplasticizer is 1:0.07:0.05:0.26:0.02:0.03. This material is suitable for printing objects with high precision and high strength.

[0061] Add the weighed Portland cement, silica fume, calcium sulfoaluminate expansion agent, and calcium formate early strength agent into the ball mill, and mix for 15 minutes to make a uniform powder material. Using a 3D printer, first spread a layer of 0.5mm thick powder material evenly, and then spray water in the preset area of ​​the powder material layer in proportion; repeat the above process to carry out molding.

[0062]At a room temperature of 15°C to 30°C, the printed object can be hardened within 0.5 hours after printing, and has sufficient strength for powder removal. Sealed and cured at 20°C, the compressive strengths at 3 days and 28 days were 58MPa and 127MPa, and the...

Embodiment 2

[0066] The weight ratio of high belite sulfoaluminate cement, limestone powder, water, lithium carbonate and citric acid is 1:0.25:0.5:0.002:0.001. This material is suitable for printing objects with high precision and fast forming.

[0067] Add the weighed high belite sulfoaluminate cement, limestone powder, lithium carbonate, and citric acid into the ball mill, and mix for 15 minutes to make a uniform powder material. Using a 3D printer, first spread a layer of 0.5mm thick powder material evenly, and then spray water in the preset area of ​​the powder material layer in proportion; repeat the above process to carry out molding.

[0068] At a room temperature of 15°C to 30°C, the printed object can be hardened within 20 minutes after printing, and has enough strength to remove powder. Sealed and cured at 20°C, the 1-day and 3-day compressive strengths were 29MPa and 51MPa, respectively, and the 3-day and 28-day flexural strengths were 4.9MPa and 7.1MPa, respectively.

Embodiment 3

[0072] The weight ratio of Portland cement, sulfoaluminate cement, granulated blast furnace slag powder, water, styrene-butadiene latex, and polycarboxylate superplasticizer is 1:0.05:0.45:0.26:0.22:0.01, and the weight ratio of styrene-butadiene latex The solid content is 50%. This material is suitable for objects with high printing accuracy and high deformation requirements.

[0073] Add the weighed portland cement, sulphoaluminate cement, and granulated blast furnace slag powder into the ball mill, and mix for 15 minutes to make a uniform powder material. Add the weighed styrene-butadiene latex into water and stir for 5 minutes to make a uniform liquid phase material. Using a 3D printer, first spread a layer of 0.5mm thick powder material evenly, and then spray the liquid phase material in the preset area of ​​the powder material layer in proportion; repeat the above process to carry out molding.

[0074] After printing, it was sealed and cured at 20°C. The compressive st...

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