CN-121974648-A - Decorative cement with formaldehyde adsorption and catalytic decomposition functions and preparation and construction methods thereof

CN121974648ACN 121974648 ACN121974648 ACN 121974648ACN-121974648-A

Abstract

The invention discloses formaldehyde adsorption catalytic decomposition functional decorative cement and a preparation and construction method thereof, and belongs to the technical field of building materials. The decorative cement comprises, by weight, 78-83 parts of an inorganic powdery cementing material, 4-6 parts of a formaldehyde adsorption catalytic decomposition component A, 9-13 parts of a formaldehyde adsorption catalytic decomposition component B and 2-3 parts of an additive. The invention can realize the efficient adsorption, catalytic oxidation and thorough decomposition of formaldehyde under the conditions of normal temperature and pressure and natural light by compounding multiple components, and has the comprehensive functions of long-acting formaldehyde removal, moisture resistance, bacteria resistance and the like. The material has simple preparation process, good construction performance, and can be used as indoor wall decoration material to replace traditional plastering gypsum, and has environmental protection, high efficiency and durability.

Inventors

Yi Feiyang
WANG NING
YANG LI
Qing ting
ZHU MENG
XIONG QIAN
ZHANG XUAN

Assignees

嘉华特种水泥股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260129

Claims (10)

1. The formaldehyde adsorption catalytic decomposition functional decorative cement is characterized by comprising the following raw materials in parts by weight: 78-83 parts of inorganic powdery cementing material; 4-6 parts of formaldehyde adsorption catalytic decomposition component A; 9-13 parts of formaldehyde adsorption catalytic decomposition component B; 2-3 parts of an additive; The decorative cement according to claim 1, wherein the inorganic powdery cementing material comprises 95-97% cement clinker and 3-5% gypsum by mass.
2. The decorative cement according to claim 2, wherein the cement clinker is white cement clinker with whiteness not less than 89, the white cement clinker is prepared by firing raw materials including, by mass, 72% -78% of low-iron limestone, 18% -22% of kaolin, 0% -3% of quartz powder and 0% -2% of high-purity bauxite, and the gypsum is natural dihydrate gypsum.
3. The decorative cement according to claim 1, wherein the formaldehyde adsorption catalytic decomposition component a comprises, in parts by weight: 40-55 parts of activated carbon particles; 15-25 parts of nano manganese dioxide; 18-30 parts of first deionized water; 2-5 parts of a dispersing agent a; preferably, the formaldehyde adsorption catalytic decomposition component a is prepared as follows: dissolving a dispersing agent a in first deionized water, adding nano manganese dioxide, dispersing uniformly, adding active carbon particles, soaking for 2-4 hours at 40-50 ℃, and filtering to obtain a load solid; drying the loaded solid at 60-100 ℃, and then roasting at 150-200 ℃ for 2 hours; grinding the roasted material to 325-400 meshes to obtain the formaldehyde adsorption catalytic decomposition component A.
4. The decorative cement according to claim 3, wherein the activated carbon particles are acid-washed coconut activated carbon or bamboo charcoal with the particle size of 1-20mm, the nano manganese dioxide is delta-type manganese dioxide with the particle size of 5-50nm, the dispersing agent a is one or two of sodium acrylate-polyoxyethylene ether ester copolymer, sodium methacrylate-polyoxyethylene ether ester copolymer, sodium hexametaphosphate, sodium pyrophosphate, polyvinylpyrrolidone, polyethylene glycol and polypropylene glycol, and the drying of the loaded solid is sectional heating drying, namely, firstly, drying the loaded solid at 60 ℃ for 2 hours, and then heating to 100 ℃ and drying to constant weight.
5. The decorative cement according to claim 1, wherein the formaldehyde adsorption-catalytic decomposition component B comprises, in parts by weight: 15-30 parts of modified zeolite powder; 5-10 parts of modified nano titanium dioxide; 0.5-1 part of dispersant b; 100-200 parts of second deionized water; preferably, the formaldehyde adsorption catalytic decomposition component B is prepared as follows: adding the modified nano titanium dioxide and the dispersing agent b into second deionized water to be uniformly dispersed to form a dispersion liquid; Adding modified zeolite powder into the dispersion, stirring for 2 hours, and filtering to obtain a filter cake; Drying the filter cake, and grinding the filter cake to powder with the specific surface area of 380-420m 2 /kg and the screen residue of 45 mu m of less than or equal to 8% to obtain the formaldehyde adsorption catalytic decomposition component B; Preferably, the dispersant b is polyoxyethylene sorbitan monooleate.
6. The decorative cement according to claim 5, wherein the modified zeolite powder is hydrophobic formaldehyde-selective molecular sieve zeolite powder, prepared as follows: ultrasonically cleaning 20-40 parts by mass of natural zeolite powder by 200-400 parts by mass of third deionized water, and then drying at 100-110 ℃ for 1-3 hours; dissolving 2-4 parts of methyltrimethoxysilane in 100-200 parts of absolute ethyl alcohol, adding dried zeolite powder, and stirring at room temperature to carry out hydrophobic modification reaction; After the reaction is finished, separating a solid product, washing, drying and grinding to obtain the hydrophobic formaldehyde selective molecular sieve zeolite powder.
7. The decorative cement of claim 5, wherein the modified nano titanium dioxide is nitrogen doped-citric acid sensitized modified nano titanium dioxide prepared as follows: adding 10-20 parts of nano titanium dioxide powder, 2-4 parts of urea and 1-2 parts of citric acid into 100-200 parts of fourth deionized water according to parts by weight, and stirring to form a uniform suspension; Continuously stirring the suspension at 55-65 ℃ for reaction for 1.5-3 hours; after the reaction is finished, filtering, washing and drying the product, roasting for 1-3 hours at 280-320 ℃ and grinding into powder to obtain the nitrogen doped-citric acid sensitized modified nano titanium dioxide.
8. The decorative cement according to claim 1, wherein the admixture is composed of the following components in mass ratio: defoamer, degerming agent and emulsion powder = (4-4.5): (0.8-1.0): (2.0-2.5): (2.5-3.0); Preferably, the water reducer is a polycarboxylic acid high-performance water reducer, the defoamer is a polyether modified organic silicon defoamer, the degerming agent is one or two of nanometer silver powder and nanometer zinc oxide powder, and the latex powder is one or two of vinyl acetate-ethylene copolymer powder and vinyl acetate-tertiary ethylene carbonate copolymer powder.
9. A method of preparing the decorative cement of claim 8, comprising the steps of: S1, premixing a water reducing agent and a defoaming agent to form a premix; S2, sequentially adding the premix, the inorganic powdery cementing material, the formaldehyde adsorption catalytic decomposition component A, the formaldehyde adsorption catalytic decomposition component B and the emulsion powder into stirring equipment, and stirring for 3-6 minutes; S3, adding the degerming agent while stirring, and continuously stirring for 2 minutes to obtain the decorative cement.
10. A method of constructing a decorative cement according to any one of claims 1 to 8, comprising the steps of: Mixing the decorative cement with mixing water, controlling the water-cement ratio to be 0.42-0.55, uniformly stirring to form slurry, and performing painting or spraying construction; wherein the water-cement ratio is the ratio of the weight of mixing water to the weight of dry powder of inorganic powdery cementing material in the decorative cement; Preferably, the water-gel ratio is 0.42-0.45 when the painting construction is carried out, and is 0.50-0.55 when the spraying construction is carried out.

Description

Decorative cement with formaldehyde adsorption and catalytic decomposition functions and preparation and construction methods thereof Technical Field The invention relates to the technical field of building materials, in particular to formaldehyde adsorption catalytic decomposition functional decorative cement and a preparation and construction method thereof. Background The indoor formaldehyde pollution becomes an important environmental problem which is harmful to human health, and the release source is wide and the period is long, and especially the formaldehyde is easy to accumulate and exceeds standard in the closed space after decoration. The existing formaldehyde treatment technology is mainly divided into two types, namely physical adsorption and chemical decomposition. Physical adsorption materials such as active carbon, zeolite and other porous materials can adsorb formaldehyde in a short period of time, but are easy to saturate, and desorption can occur when the temperature and the humidity change, so that secondary pollution is caused. In chemical decomposition technology, photocatalyst materials (such as nano titanium dioxide) are usually excited by ultraviolet rays and have low efficiency under indoor visible light conditions, and other catalytic materials such as manganese dioxide can work under a dark condition but are easy to deactivate in a high-humidity environment. In addition, the prior art focuses on single functions, and is difficult to realize synergic and long-acting effects of adsorption, catalysis and decomposition. The formaldehyde treatment function is combined with the building decoration material, so that the pollution control and long-acting purification of the source are realized, and the formaldehyde treatment function is an important development direction in the field of current green building materials. Therefore, the building material which can efficiently, permanently and safely remove formaldehyde under indoor environment conditions and has the decoration function is developed, and the building material has important practical application value. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide decorative cement with formaldehyde adsorption, catalysis and decomposition functions and a preparation and construction method thereof. The material can be used as a wall decoration base layer, can efficiently and long-effectively remove indoor formaldehyde under the conditions of normal temperature and pressure and natural light by the synergistic effect of physical adsorption and chemical catalysis, and has an antibacterial function. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: In a first aspect, a formaldehyde adsorption catalytic decomposition functional decorative cement is provided, which comprises the following raw materials in parts by weight: 78-83 parts of inorganic powdery cementing material; 4-6 parts of formaldehyde adsorption catalytic decomposition component A; 9-13 parts of formaldehyde adsorption catalytic decomposition component B; 2-3 parts of an additive. Further, the inorganic powdery cementing material comprises 95-97% of cement clinker and 3-5% of gypsum by mass percent. The cement clinker is white cement clinker with whiteness not less than 89, the white cement clinker is prepared by firing raw materials including, by mass, 72% -78% of low-iron limestone, 18% -22% of kaolin, 0% -3% of quartz powder and 0% -2% of high-purity bauxite, and the gypsum is natural dihydrate gypsum. The gypsum is natural dihydrate gypsum (CaSO 4・2H2 O), the content of crystal water is high, the water absorption and dissolution rate are matched with the hydration process of the white cement clinker, and the formation of an ettringite retarding layer by C 3 A is facilitated, so that the effects of adjusting the setting time and internal maintenance are achieved. Further, the formaldehyde adsorption catalytic decomposition component A comprises the following components in parts by weight: 40-55 parts of activated carbon particles; 15-25 parts of nano manganese dioxide; 18-30 parts of first deionized water; 2-5 parts of a dispersing agent a; preferably, the formaldehyde adsorption catalytic decomposition component a is prepared as follows: dissolving a dispersing agent a in first deionized water, adding nano manganese dioxide, dispersing uniformly, adding active carbon particles, soaking for 2-4 hours at 40-50 ℃, and filtering to obtain a load solid; drying the loaded solid at 60-100 ℃, and then roasting at 150-200 ℃ for 2 hours; grinding the roasted material to 325-400 meshes to obtain the formaldehyde adsorption catalytic decomposition component A. Further, the activated carbon particles are acid-washed coconut shell activated carbon or bamboo charcoal with the particle size of 1-20mm, the nano manganese dioxide is delta-type manganese dioxide with the particle size of 5-50nm, the