阅读说明：本技术 一种高效持久除甲醛硅藻泥及其制备方法 (Diatom ooze capable of efficiently and durably removing formaldehyde and preparation method thereof ) 是由 魏春光 王静霞 谷星星 梁燕 洪碧玙 于 2019-10-08 设计创作，主要内容包括：本发明公开了一种高效持久除甲醛硅藻泥及其制备方法,本发明制备的硅藻泥,具有安全性高、除甲醛效果优异且对环境条件依赖性小、除甲醛性能稳定持久的优点。本发明高效持久除甲醛硅藻泥的制备方法为先进行硅藻土改性,在硅藻土表面均匀原位地负载锰氧化物,为硅藻泥提供丰富的高效持久除甲醛反应位点,然后通过添加钙质材料、矿物纤维、增稠剂等进一步增加硅藻泥的强度、粘度和防护性能,该制备方法简易环保,适合大规模使用和产业化生产。(The diatom ooze prepared by the invention has the advantages of high safety, excellent formaldehyde removing effect, small dependence on environmental conditions and stable and durable formaldehyde removing performance. The preparation method of the diatom ooze capable of efficiently and durably removing formaldehyde comprises the steps of modifying the diatomite, uniformly loading manganese oxide on the surface of the diatomite in situ, providing abundant efficient and durably formaldehyde-removing reaction sites for the diatom ooze, and then further increasing the strength, viscosity and protective performance of the diatom ooze by adding calcium materials, mineral fibers, thickening agents and the like.)

1. The diatom ooze capable of efficiently and durably removing formaldehyde is prepared from the following raw materials in percentage by weight: 25-60 parts of manganese-based modified diatomite, 20-40 parts of calcium material, 10-40 parts of mineral fiber, 0.5-5 parts of thickening agent and 1-10 parts of redispersible latex powder.

2. The diatom ooze capable of removing formaldehyde efficiently and durably according to claim 1, wherein the manganese-based modified diatomite is a composite of manganese oxide and diatomite, and the manganese oxide accounts for 1 ~ 30% of the manganese-based modified diatomite.

3. The diatom ooze capable of removing formaldehyde efficiently and durably according to claim 1, wherein said calcareous material is one or a combination of two or more of calcium silicate, gray calcium, calcium oxide, calcium phosphate, calcium carbonate, calcium sulfate and calcium aluminate.

4. The diatom ooze capable of removing formaldehyde efficiently and durably according to claim 1, wherein the mineral fibers are one or a combination of more than two of wollastonite fibers, aluminum silicate fibers, basalt fibers, sepiolite fibers and attapulgite fibers.

5. The diatom ooze capable of removing formaldehyde efficiently and durably according to claim 1, wherein said thickener is one or a combination of two or more of sodium carboxymethylcellulose, hydroxypropyl methylcellulose, bentonite, hydroxyethyl cellulose and polyvinyl alcohol.

6. The diatom ooze capable of removing formaldehyde efficiently and durably according to claim 2, wherein the particle size of the diatom ooze is 400 ~ 2000 mesh, the particle size of the calcareous material is 400 ~ 1250 mesh, and the particle size of the mineral fiber is 400 ~ 1250 mesh.

7. The diatom ooze capable of removing formaldehyde efficiently and durably according to claim 1, wherein the diatom ooze capable of removing formaldehyde efficiently and durably has a pH of 6-10 in water.

8. The preparation method of the diatom ooze capable of efficiently and durably removing formaldehyde as claimed in claim 1, which is characterized by comprising the following steps:

s01, preparing a potassium permanganate solution with the mass fraction of 0.1 ~ 5%, adding diatomite into the potassium permanganate solution according to the proportion that the solid content is 20-60wt%, and uniformly stirring to obtain diatomite slurry;

s02, adding manganese salt into the diatomite slurry according to the proportion, wherein the molar ratio of the manganese salt to the potassium permanganate is 1.25 ~ 1.75.75: 1;

s03, adding manganese salt, stirring for 3-12h, dewatering and drying to obtain manganese-based modified diatomite;

s04, mixing the manganese-based modified diatomite, the calcareous material, the mineral fiber, the thickening agent and the redispersible latex powder in proportion to obtain the diatom ooze capable of efficiently and durably removing formaldehyde.

9. The method for preparing diatom ooze removing formaldehyde efficiently and durably according to claim 8, wherein in step S01, adding acid to adjust the pH of potassium permanganate solution to be less than 3.

10. The method for preparing the diatom ooze capable of removing formaldehyde efficiently and durably according to claim 8, wherein the manganese salt is at least one of manganese acetate, manganese sulfate, manganese chloride, manganese nitrate and manganese bromide.

Technical Field

The invention relates to the field of building decoration materials, in particular to diatom ooze capable of efficiently and durably removing formaldehyde and a preparation method thereof.

Background

Along with the development of society and the improvement of economic level, people pay more attention to self health and also put forward higher requirements on building decoration materials. In the existing building decoration, formaldehyde is one of the main chronic diseases disturbing the health of people, and seriously harms the health of newly decorated families, especially children, pregnant women and old people.

The diatom ooze is a novel wall material taking diatomite as a main raw material, is a water-soluble powdery decorative coating, has the main functional material of diatomite formed by depositing diatom plants in oceans or lakes under the action of natural environment, has the physical properties of fineness, looseness, light weight, porosity, strong water absorption, strong permeability and the like, can effectively adsorb free formaldehyde, benzene, ammonia and other harmful substances in the air, can purify peculiar smell generated by pets, smoking, garbage and the like in the air, is easy to construct, and is suitable for wall and shed roof decoration. Therefore, the diatom ooze is combined with the traditional interior wall decoration material to prepare a decoration building material product with both decoration effect and environmental protection and health function, which becomes a new favorite in the decoration building material market and is deeply favored by the market.

In the traditional technology, most diatom ooze wall materials take nano titanium dioxide as a photocatalyst, and catalytically desorb harmful substances in the diatom ooze wall materials under the illumination condition, most diatom ooze wall materials can only adsorb the harmful substances, have weak capability of decomposing the harmful substances, can purify air only under sufficient light, and are difficult to meet the urgent requirements of people on efficiently and permanently adsorbing and decomposing the harmful substances such as formaldehyde.

Disclosure of Invention

The invention aims to provide diatom ooze capable of efficiently and durably removing formaldehyde, aiming at the defects in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

the diatom ooze capable of efficiently and durably removing formaldehyde is prepared from the following raw materials in percentage by weight: 25-60 parts of manganese-based modified diatomite, 20-40 parts of calcium material, 10-40 parts of mineral fiber, 0.5-5 parts of thickening agent and 1-10 parts of redispersible latex powder.

As an improvement of the diatom ooze for efficiently and durably removing formaldehyde, the manganese-based modified diatomite is compounded by manganese oxide and diatomite, and the proportion of the manganese oxide in the manganese-based modified diatomite is 1 ~ 30%.

As an improvement of the diatom ooze for efficiently and durably removing formaldehyde, the calcareous material is one or a combination of more than two of calcium silicate, ash calcium, calcium oxide, calcium phosphate, calcium carbonate, calcium sulfate or calcium aluminate.

As an improvement of the diatom ooze for efficiently and durably removing formaldehyde, the mineral fibers are one or a combination of more than two of wollastonite fibers, aluminum silicate fibers, basalt fibers, sepiolite fibers and attapulgite fibers.

As an improvement of the diatom ooze for efficiently and durably removing formaldehyde, the thickening agent is one or a combination of more than two of sodium carboxymethyl cellulose, hydroxypropyl methyl cellulose, bentonite, hydroxyethyl cellulose and polyvinyl alcohol.

As an improvement of the diatom ooze for efficiently and durably removing formaldehyde, the particle size of the diatomite is 400 ~ 2000 meshes, the particle size of the calcareous material is 400 ~ 1250 meshes, and the mineral fiber is 400 ~ 1250 meshes.

As an improvement of the diatom ooze capable of efficiently and durably removing formaldehyde, the diatom ooze capable of efficiently and durably removing formaldehyde has a pH value of 6-10 in water.

The invention also aims to provide a preparation method of the diatom ooze capable of efficiently and durably removing formaldehyde, which comprises the following steps:

s01, preparing a potassium permanganate solution with the mass fraction of 0.1 ~ 5%, adding diatomite into the potassium permanganate solution according to the proportion that the solid content is 20-60wt%, and uniformly stirring to obtain diatomite slurry;

s02, adding manganese salt into the diatomite slurry according to the proportion, wherein the molar ratio of the manganese salt to the potassium permanganate is 1.25 ~ 1.75.75: 1;

s03, adding manganese salt, stirring for 3-12h, dewatering and drying to obtain manganese-based modified diatomite;

s04, mixing the manganese-based modified diatomite, the calcareous material, the mineral fiber, the thickening agent and the redispersible latex powder in proportion to obtain the diatom ooze capable of efficiently and durably removing formaldehyde.

As an improvement of the preparation method of the diatom ooze capable of efficiently and durably removing formaldehyde, in step S01, acid is added to adjust the PH of the potassium permanganate solution to be less than 3.

As an improvement of the preparation method of the diatom ooze capable of efficiently and durably removing formaldehyde, the manganese salt is at least one of manganese acetate, manganese sulfate, manganese chloride, manganese nitrate and manganese bromide.

As an improvement of the preparation method of the diatom ooze capable of efficiently and durably removing formaldehyde, in the step S03, after the manganese salt is added, heating and ultrasonic stirring are carried out for 3-12 hours.

Compared with the prior art, the invention at least has the following beneficial effects:

(1) the preparation method of the diatom ooze capable of efficiently and durably removing formaldehyde, disclosed by the invention, has the advantages that the diatomite is used as a base material, manganese oxide is loaded in situ to obtain manganese-based modified diatomite, the excellent moisture absorption and desorption performance of the diatomite is kept, the diatomite has an ultrahigh specific surface area and a rich and developed pore structure, more manganese-based oxide microspheres can be accommodated, the contact area and the contact time between manganese-based oxide particles and formaldehyde molecules can be increased, the formaldehyde is decomposed more uniformly, efficiently and thoroughly, and the formaldehyde decomposition efficiency is greatly improved.

(2) The invention utilizes non-photocatalytic manganese-based oxide to continuously and efficiently decompose formaldehyde in the air. The manganese-based oxide is a deep oxidation catalyst, has a mixed-valence polyhedral molecular sieve structure, has high oxygen reactivity, does not generate acid when reacting with aldehyde, and can be adsorbed to a small extent to supplement oxygen vacancies when adsorbing oxygen or other oxidizing gases; the water produced will dissociate again to produce OH, which will continue to decompose formaldehyde. Through the chemical decomposition mode, the manganese-based oxide can efficiently and directly decompose formaldehyde into pollution-free carbon dioxide and water, the phenomenon that the formaldehyde is released again due to the fact that thermal movement is separated from desorption after the formaldehyde is adsorbed by a physical adsorbent is avoided, and meanwhile, the manganese-based oxide realizes cyclic utilization of decomposition products in the decomposition process.

(3) By adding the calcium material, the strength of the diatom ooze can be adjusted, the oil absorption of the coating and the ink can be reduced, and the alkalescence of the coating can be kept, so that the coating has good uniform coating property, adhesiveness and ageing resistance. In addition, the addition of the mineral fibers relieves cracks and deformation generated during drying and shrinkage of the material, and further increases the strength of the diatom ooze, so that the service life of the diatom ooze for efficiently and durably removing formaldehyde is prolonged.

(4) The diatom ooze prepared by the invention has the advantages of high safety, excellent formaldehyde removal effect, small dependence on environmental conditions and stable and durable formaldehyde removal performance. The preparation method of the diatom ooze capable of efficiently and durably removing formaldehyde comprises the steps of modifying the diatomite, uniformly loading manganese oxide on the surface of the diatomite in situ, providing abundant efficient and durably formaldehyde-removing reaction sites for the diatom ooze, and then further increasing the strength, viscosity and protective performance of the diatom ooze by adding calcium materials, mineral fibers, thickening agents and the like.

Detailed Description

The present invention will be further described below with reference to specific examples, but the embodiments of the present invention are not limited thereto.