White high-performance cement-based 3d printing material and method for preparing the same

Abstract

The application discloses a kind of white high-performance cement-based 3D printing materials and preparation method thereof, including 100 weight parts of C50 white Portland cement, 40~50 weight parts of white calcium carbonate, 180~200 weight parts of white quartz sand, 25~30 weight parts of water, 2~4 weight parts of polyvinyl alcohol fiber, 0.5~1.2 weight parts of superplasticizer, 0.1~0.15 weight parts of hydroxypropyl methyl cellulose, 1~3 weight parts of white nanoscale SiO2.The application solves the problem that existing 3D printing concrete components are affected by natural weathering, the paint surface is stripped and damaged quickly, and the aesthetic appearance is easily lost.

Description

Technical Field

[0001] This invention relates to the field of 3D printing technology, specifically to a white high-performance cement-based 3D printing material and its preparation method. Background Technology

[0002] The advantages of 3D printing concrete materials lie in saving on disposable template materials, reducing labor costs, and enabling the printing of highly artistic irregular structures. However, the innovation of these irregular structures is often limited by the material's strength. Low-strength printing materials can lead to an increase in the cross-sectional area under stress, resulting in bulky and heavy components that severely diminish the artistic appeal of 3D printed concrete parts. Therefore, enhancing the mechanical properties of 3D printing materials has become a pressing issue.

[0003] Meanwhile, 3D printing materials are often used in outdoor architectural features or creative design components with high artistic value. Their surface color is often enhanced by applying colored paint to improve the decorative effect, but 3D printed components exposed to the environment are subject to natural weathering (solar radiation, water, gases and organisms), causing the paint to peel off and deteriorate quickly, easily losing their aesthetic appeal. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, a white high-performance cement-based 3D printing material and its preparation method are provided to solve the problem that existing 3D printed concrete components are subject to natural weathering, resulting in rapid paint peeling and damage, and easy loss of aesthetics.

[0005] To achieve the above objectives, a white high-performance cement-based 3D printing material is provided, comprising 100 parts by weight of C50 white silicate cement, 40-50 parts by weight of white calcium carbonate, 180-200 parts by weight of white quartz sand, 25-30 parts by weight of water, 2-4 parts by weight of polyvinyl alcohol fiber, 0.5-1.2 parts by weight of superplasticizer, 0.1-0.15 parts by weight of hydroxypropyl methylcellulose, and 1-3 parts by weight of white nano-sized SiO2.

[0006] Furthermore, it also includes white polyacrylamide fibers.

[0007] Furthermore, the volume content of the white polyacryl alcohol fiber is less than 3%.

[0008] Furthermore, the white quartz sand has a particle size of less than 1 mm.

[0009] This invention provides a method for preparing a white, high-performance cement-based 3D printing material, characterized by comprising the following steps:

[0010] White calcium carbonate, white quartz sand, hydroxypropyl methylcellulose, and white nano-sized SiO2 are added to C50 white silicate cement and stirred evenly to obtain powder.

[0011] Add water, polyvinyl alcohol fiber, superplasticizer in the powder, stir evenly to obtain white high-performance cement-based 3D printing material.

[0012] The white high-performance cement-based 3D printing material of the present application is reinforced by adding millimeter-level white quartz sand, micron-level white ultra-fine calcium carbonate, nanometer-level white SiO2 and white PVA fiber, realizes multi-scale synergistic strengthening of white system ultra-high performance concrete, and further breaks through the problems of poor weather resistance and low structural color artistic value of traditional 3D printing concrete. DETAILED DESCRIPTION

[0013] The present application will be further described in detail below in conjunction with examples. It can be understood that the specific examples described herein are only used to explain the related application, and not to limit the application.

[0014] It should be noted that the examples in the present application and the features in the examples can be combined with each other without conflict. The present application will be described in detail below in conjunction with examples.

[0015] The present application provides a white high-performance cement-based 3D printing material, comprising 100 parts by weight of C50 white Portland cement, 40-50 parts by weight of white calcium carbonate, 180-200 parts by weight of white quartz sand, 25-30 parts by weight of water, 2-4 parts by weight of polyvinyl alcohol fiber, 0.5-1.2 parts by weight of superplasticizer, 0.1-0.15 parts by weight of hydroxypropyl methylcellulose, and 1-3 parts by weight of white nanometer-level SiO2.

[0016] The C50 white Portland cement is P.W.52.5 cement.

[0017] The white calcium carbonate is micron-level white ultra-fine calcium carbonate.

[0018] The polyvinyl alcohol fiber is white polyvinyl alcohol fiber (PVA fiber).

[0019] In the present embodiment, the superplasticizer is SiKa ViscoCrete-530P high-performance superplasticizer of Sika or PCA-I series polycarboxylic acid high-performance superplasticizer of Suobote.

[0020] In the embodiment, the white nanoscale SiO2 is measured in the form of a hydrosol, and the unit of water quantity needs to deduct the water content of the hydrosol. By adding the nanoscale SiO2 in the white high-performance cement-based 3D printing material, the mechanical properties and durability of the material are improved.

[0021] In the embodiment, the white high-performance cement-based 3D printing material of the application further comprises white polypropylene alcohol fibers. By adding the white polypropylene alcohol fibers, the hardening tensile strength and toughness of the component are improved.

[0022] Specifically, the volume content of the white polypropylene alcohol fibers is less than 3%.

[0023] As a preferred embodiment, the particle size of the white quartz sand is less than 1 mm. The maximum particle size of the white quartz sand should be less than 1 mm, and the structural density can be improved by improving the grading of the quartz sand.

[0024] The application provides a preparation method of a white high-performance cement-based 3D printing material, comprising the following steps:

[0025] S1, adding white calcium carbonate, white quartz sand, hydroxypropyl methyl cellulose and white nanoscale SiO2 into C50 white Portland cement and stirring uniformly to obtain a powder;

[0026] S2, adding water, polyvinyl alcohol fibers and superplasticizer into the powder and stirring uniformly to obtain the white high-performance cement-based 3D printing material.

[0027] In the embodiment, by adding millimeter-level white quartz sand, micron-level white ultra-fine calcium carbonate, nanoscale white SiO2, white polypropylene alcohol fibers, hydroxypropyl methyl cellulose and superplasticizer into C50 white Portland cement (P.W. 52.5 cement), a high-strength white 3D printing concrete component with no need for painting and high weather resistance is prepared.

[0028] The white high-performance cement-based 3D printing material of the application presents the effect of the inside and outside of the 3D printing component being white from the structural color; meanwhile, the compactness of the 3D printing component is increased by the design of the ratio according to the closest packing theory, and the durability is improved by reducing the water and air entering the inside of the concrete.

[0029] The white high-performance cement-based 3D printing material of the application starts from the pure white raw material, and takes the rheological property, workability, setting time and interlayer adhesion as the key parameters. Specifically, the PVA fiber for concrete is used as the structural reinforcing body, the white cement system is used as the cementitious material, the glue powder and the thixotropic agent are added, the setting time is controllable, the thixotropy is controllable, and the strength is controllable, so that the printing process requirements of the large-size white building component can be met.

[0030] The white high-performance cement-based 3D printing material of the present application is reinforced by adding millimeter-level white quartz sand, micron-level white ultra-fine calcium carbonate, nanometer-level white SiO2 and white PVA fiber, realizes the multi-scale synergistic strengthening of the white system ultra-high performance concrete, and further breaks through the problems of poor weather resistance and low structural color artistic value of traditional 3D printing concrete.

[0031] The white topcoat on the conventional 3D printing component needs to be brushed and dried twice, which takes two days. The white high-performance cement-based 3D printing material of the present application has high turnover efficiency for preparing concrete components.

[0032] The concrete component prepared by the white high-performance cement-based 3D printing material of the present application has good weather resistance of structural color, white inside and outside, dense structure and strong resistance to natural weathering.

[0033] The concrete component prepared by the white high-performance cement-based 3D printing material of the present application can reach C60 grade in 7 days and C80 in 28 days, greatly improving the strength of the 3D printing component, making the minimum design cross-sectional area smaller, and further saving materials and improving the freedom of component artistic design.

[0034] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. It should be understood by those skilled in the art that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by replacing the above features with the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. A white, high-performance cement-based 3D printing material, characterized in that, It includes 100 parts by weight of C50 white silicate cement, 40-50 parts by weight of white calcium carbonate, 180-200 parts by weight of white quartz sand, 25-30 parts by weight of water, 2-4 parts by weight of polyvinyl alcohol fiber, 0.5-1.2 parts by weight of superplasticizer, 0.1-0.15 parts by weight of hydroxypropyl methylcellulose, and 1-3 parts by weight of white nano-sized SiO2; The white quartz sand has a particle size of less than 1 mm; The white calcium carbonate is micron-sized white ultrafine calcium carbonate.

2. The white high-performance cement-based 3D printing material according to claim 1, characterized in that, It also includes white polyacryl alcohol fibers.

3. The white high-performance cement-based 3D printing material according to claim 2, characterized in that, The volume fraction of the white polyacryl alcohol fiber is less than 3%.

4. A method for preparing a white, high-performance cement-based 3D printing material as described in any one of claims 1 to 3, characterized in that, Includes the following steps: White calcium carbonate, white quartz sand, hydroxypropyl methylcellulose, and white nano-sized SiO2 are added to C50 white silicate cement and stirred evenly to obtain powder. Water, polyvinyl alcohol fiber, and superplasticizer are added to the powder and stirred evenly to obtain a white high-performance cement-based 3D printing material.