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A dust-proof and stain-resistant fiber-reinforced cement product and its preparation method

A fiber-reinforced cement and stain-resistant technology, which is applied in the field of building exterior wall decoration products, can solve the problems of carbon nanotubes' crack resistance, impermeability and water resistance are not obvious enough, cement substrates have poor grip and dispersion, and other problems. Achieve the effect of enhancing antistatic and antifouling performance, improving grip strength and high tensile strength

Inactive Publication Date: 2020-09-22
NANJING BEILIDA NEW MATERIAL SYST ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, whether carbon nanotubes are used as cement substrates for anti-cracking or anti-seepage and waterproofing, the effect is not obvious enough. The main reason is that carbon nanotubes are easy to agglomerate and difficult to disperse in concrete materials. The problem of poor grip of composite materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Soak the commercially available carbon nanotubes in an alkaline solution with a pH value of 9 for 24 hours, perform alkalization treatment to increase the defects of the carbon nanotubes, and then dry them in an oven.

[0029] (2) Disperse the dried carbon nanotubes in a methanol solution with a mass ratio of 3wt% aluminate coupling agent, and stir at 60°C to modify the surface of the carbon nanotubes to enhance the bond between the carbon nanotubes and the cement base. Bonding force between materials.

[0030] (3) Mix 0.01 parts of modified carbon nanotubes, 10 parts of cement, and 0.5 parts of sodium hexametaphosphate for 15 minutes for pre-dispersion to obtain a pre-dispersed powder.

[0031] (4) Prepare by mixing 30 parts of cement, 30 parts of sand, 0.5 part of naphthalenesulfonate formaldehyde condensation product water reducer, 0.5 part of siloxane water repellent, 1 part of toner, and 0.5 part of redispersible latex powder for 15 minutes Fiber-reinforced ce...

Embodiment 2

[0036] (1) Soak the commercially available carbon nanotubes in an alkaline solution with a pH value of 10 for 10 hours, perform alkalization treatment to increase the defects of the carbon nanotubes, and then dry them in an oven.

[0037] (2) Disperse the dried carbon nanotubes in an ethanol solution with a mass ratio of 5wt% titanate coupling agent, and stir at 80°C to modify the surface of the carbon nanotubes to enhance the bond between the carbon nanotubes and the cement base. bonding force between materials

[0038] (3) Mix 0.5 parts of modified carbon nanotubes, 15 parts of cement, and 2 parts of polyethylene glycol dispersant for 30 minutes for pre-dispersion to obtain a pre-dispersed powder.

[0039] (4) Mix 50 parts of cement, 50 parts of sand, 3 parts of sulfonated melamine formaldehyde condensation product water reducer, 3 parts of acrylic polymer water repellent, 5 parts of toner, and 3 parts of polypropylene emulsion for 30 minutes to prepare fiber reinforcement ...

Embodiment 3

[0044] (1) Soak the commercially available carbon nanotubes in a weakly alkaline solution with a pH value close to 7 for 48 hours, perform alkalization treatment to increase the defects of the carbon nanotubes, and then dry them in an oven.

[0045] (2) Disperse the dried carbon nanotubes in a 4wt% silane coupling agent propanol solution by mass ratio, stir at 70°C, modify the surface of the carbon nanotubes with hydrophilicity, and strengthen the carbon nanotubes and cement-based materials the bonding force between them.

[0046] (3) Mix 0.1 part of modified carbon nanotubes, 12 parts of cement, and 1 part of polyvinyl alcohol dispersant for 20 minutes for pre-dispersion to obtain a pre-dispersed powder.

[0047] (4) Mix 40 parts of cement, 40 parts of sand, 2 parts of polycarboxylate superplasticizer, 2 parts of vinyl acetate polymer water repellent, 2 parts of toner, and 2 parts of styrene-acrylic emulsion for 20 minutes to prepare fiber-reinforced cement Surface dry powder ...

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Abstract

The invention relates to a dustproof and staining-resisting fiber reinforced cement product and a preparation method. The dustproof and staining-resisting fiber reinforced cement product comprises a carbon nanotube doped fiber reinforced cement decoration surface layer and a fiber reinforced cement structure layer. According to the dustproof and staining-resisting fiber reinforced cement product,carbon nanotubes are subjected to alkali corrosion and coupling agent hydrophilic modification, so that the dispersion performance and the gripping performance of the product in a cement substrate areenhanced; then a fiber reinforced cement decoration surface layer is doped so that the risk that the surface of a cement-based material is cracked is effectively reduced, the clean degree of a decorative cement-based surface is increased and the decoration performance of the product is enhanced; the dustproof and staining-resisting fiber reinforced cement product has dustproof and anti-cracking performance.

Description

technical field [0001] The invention relates to a building exterior wall decoration product, which has the functions of anti-crack and dust-proof. Background technique [0002] With the transformation and upgrading of the construction industry, the application market of fiber-reinforced cement products continues to expand, and fiber cement products used in the field of architectural decoration require good durability, but also need to maintain the decorativeness of the surface color and cleanliness for a long time. Traditional decorative fiber-reinforced cement achieves surface anti-pollution and self-cleaning properties by coating the surface with a layer of paint with good anti-fouling properties or photocatalytic self-cleaning materials. However, due to the aging of the paint, it is easy to fall off from the substrate, and the chemical bond Fracture aging causes the unique groups of the paint to fall off or be decomposed, making the later decorative cement-based materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00
CPCC04B28/00C04B2111/20C04B2111/90C04B2201/50C04B14/06C04B24/226C04B22/16C04B24/26C04B14/026C04B24/42C04B2103/54C04B14/42C04B22/124C04B16/0641C04B24/223C04B14/48C04B16/0683C04B22/10C04B22/142C04B24/38C04B24/2623C04B2103/302C04B14/386C04B16/0633C04B24/383C04B24/18
Inventor 熊吉如王猛
Owner NANJING BEILIDA NEW MATERIAL SYST ENG
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