Preparation method of odor-inhibiting functional nano-composite sol

Abstract

The invention relates to an environment purification material preparation technology, and aims to provide a preparation method of odor-inhibiting functional nano-composite sol. Comprising the following steps: dissolving butyl titanate into a proper amount of alcohol solvent, and dropwise adding into an acidic water-alcohol solvent for reaction; adjusting the product to be alkaline, continuously adding organosiloxane, and stirring for reaction to obtain silicon-titanium sol; stronger ammonia water is added into the silver / zinc ion mixed aqueous solution for reaction, then the silver / zinc ion mixed aqueous solution is added into the silicon-titanium sol for stirring and aging, and the odor-inhibiting functional nano-composite sol is obtained. In the practical application process, the nano-composite sol can uniformly form a film along the inner walls of micron-sized pores of the fiberboard and is firmly loaded by utilizing the excellent permeability and film-forming property of the nano-sol, so that the inhibition on the release of volatile organic compounds, the photocatalytic degradation on organic pollutants such as aldehydes / aromatic hydrocarbons and the like and the chemical adsorption effect on aromatic hydrocarbons / olefins are realized; therefore, release control and efficient capture and removal of odor compound molecules of the fiberboard are finally realized.

Description

Technical Field

[0001] The invention relates to a preparation technology of an environmental purification material, and in particular to a preparation method of an odor-inhibiting functional nano composite sol. Background Art

[0002] Fiberboard is an important man-made board material, which is widely used in building and home furnishing, commodity packaging, automobile interior, electronic circuit board processing and other fields. Fiberboard is mainly made of fibers prepared from wood resources such as branches and wood processing residues, mixed with additives such as adhesives, and then molded and hot-pressed. Wood is rich in extracts and volatile oils. The rancidity and decay of the contents and the residues of organic additives will release volatile organic compounds (VOCs) and produce a pungent odor. Affected by the different wood fibers, adhesives and hot pressing processes of ultra-thin fiberboards, the types and sources of VOCs released are complex. Among them, aldehydes, aromatics, alkanes, etc. are the main components of pungent odors, accounting for nearly 90% of the content, which poses a huge challenge to the odor control of ultra-thin fiberboards.

[0003] At present, researchers have proposed a series of control methods to address the issue of VOCs release, mainly including adhesive process and production process control, adding adsorbents, oxidants, antioxidants, physical finishing treatments and surface chemical coatings. For example, Tsinghua University studied the effect of temperature on formaldehyde and VOCs emissions from panels, and confirmed that heat treatment is an effective way to reduce odor emissions from panels. A study by Northeast Forestry University showed that PVC-covered surfaces can effectively prevent the release of volatile organic compounds and odors to a certain extent. A study by Columbia University showed that adding some nanoparticles to water-based paints can reduce the emission of volatile pollutants, and can effectively remove odors and formaldehyde as photocatalysts and adsorbents.

[0004] Taking into account the characteristics of various treatment technologies, nano-titanium dioxide photocatalytic purification technology is considered to be one of the most promising technologies for treating low-concentration VOCs due to its mild reaction conditions, good chemical stability, green environmental protection and high permeability. However, from the actual application effect, nano-titanium dioxide has problems such as easy agglomeration and low photocatalytic reaction efficiency, which limits the application of titanium dioxide photocatalytic technology in the degradation of fiberboard VOCs.

[0005] Therefore, it is necessary to propose new solutions to solve the above problems. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method for preparing a taste-inhibiting functional nanocomposite sol.

[0007] To solve the above technical problems, the solution of the present invention is:

[0008] Provided is a method for preparing a taste-inhibiting functional nanocomposite sol, comprising the following steps:

[0009] (1) Firstly dissolve butyl titanate in an appropriate amount of alcohol solvent, then dropwise add the mixed solution into an acidic water-alcohol solvent, and reflux for 6 to 24 hours in a water bath at 80° C.; adjust the pH value of the product to alkaline, continue to add organosiloxane and stir for 6 to 12 hours to obtain a silicon-titanium sol;

[0010] The amount of each component is controlled so that the mass ratio of butyl titanate: acidic water-alcohol solvent: organic siloxane is 1:20-50:1-5;

[0011] (2) Take 1 part by mass of a mixed aqueous solution of silver / zinc ions with a mass percentage concentration of 5-20%, add 0.5-1.5 parts by mass of concentrated ammonia water thereto, and react for 0.5-5 hours under stirring; add the reaction product to the silicon-titanium sol prepared in step (1) at a mass ratio of 1:200-1:20, stir for 1 hour, and then age for 12 hours to obtain a functional nano-composite sol with odor suppression function.

[0012] As a preferred embodiment of the present invention, in the step (1), the mass ratio of butyl titanate:alcohol solvent is 1:10-20, and the alcohol solvent is at least one of ethanol and isopropanol.

[0013] As a preferred embodiment of the present invention, in step (1), the acidic hydroalcoholic solvent is a mixed solvent formed by water and at least one of ethanol and isopropanol, and the pH value is adjusted to between 2 and 5 with nitric acid, and the mass of water accounts for 10 to 20% of the total mass of the mixed solvent.

[0014] As a preferred embodiment of the present invention, in the step (1), the dripping rate of the mixed solution is controlled at 2 ml / min.

[0015] As a preferred embodiment of the present invention, in step (1), the pH value of the previous reaction product is adjusted to between 8 and 10 using ammonia water.

[0016] As a preferred embodiment of the present invention, in step (1), the organosiloxane is at least one of γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane and γ-aminopropyltrimethoxysilane.

[0017] As a preferred embodiment of the present invention, in step (2), the silver / zinc ion mixed aqueous solution is an aqueous solution prepared by mixing silver nitrate and zinc nitrate in a mass ratio of 1:4 to 1:1.

[0018] As a preferred embodiment of the present invention, in step (2), the mass fraction of the concentrated ammonia water is 28%.

[0019] The present invention further provides an application method of the odor-inhibiting functional nanocomposite sol prepared by the aforementioned method, which is to use the nanocomposite sol as a soaking liquid for VOCs degradation of fiberboard.

[0020] As a preferred solution of the present invention, the fiberboard is immersed in the nanocomposite sol for 15 to 90 minutes, taken out and dried.

[0021] The implementation principle of the present invention:

[0022] In actual application, the nanocomposite sol of the present invention can utilize the excellent permeability and film-forming property of the nanosol, and uniformly form a film and firmly load the nanosol along the inner wall of the micron-sized pores of the fiberboard to achieve the following functions: the inhibitory effect of the film layer on the release of volatile organic compounds, the photocatalytic degradation effect of titanium dioxide nanoparticles on organic pollutants such as aldehydes / aromatics, and the chemical adsorption effect of silver / zinc ions on aromatics / olefins, thereby ultimately achieving the release control, efficient capture and removal of odor compound molecules on the fiberboard.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention adopts a sol-gel method to prepare a nano-titanium dioxide sol modified with organic silicon, and through compounding with silver / zinc complex ions, it can synergistically enhance the material's ability to remove VOCs from fiberboard.

[0025] 2. The odor-suppressing functional nanocomposite sol prepared by the present invention overcomes the agglomeration problem that is easily generated when conventional nano-titanium dioxide powder is directly used for coating purification materials.

[0026] 3. The odor-suppressing functional nanocomposite sol prepared by the present invention has excellent penetration ability, can penetrate into the micron-sized pores of the fiberboard, and form a film along the inner wall of the pores, thereby achieving uniform and firm loading of the functional components, avoiding the significant impact of traditional coating purification materials on the appearance of the fiberboard.

[0027] 4. The present invention organically combines the inhibitory effect of the gel film layer on the release of volatile organic compounds, the photocatalytic degradation effect of titanium dioxide and the chemical adsorption effect of silver / zinc ions, which makes up for the low efficiency of the single titanium dioxide photocatalytic reaction and realizes the release control, efficient capture and removal of different odor compound molecules of fiberboard. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with specific implementation methods. The embodiments can enable professionals in this field to understand the present invention more comprehensively, but do not limit the present invention in any way.

[0029] The method for preparing the taste-inhibiting functional nanocomposite sol provided by the present invention comprises the following steps:

[0030] (1) First, dissolve butyl titanate in an alcohol solvent, the mass ratio of butyl titanate to alcohol solvent is 1:10-20, and the alcohol solvent is at least one of ethanol and isopropanol. Then, the mixed solution is added dropwise to the acidic water-alcohol solvent at a rate of 2 ml / min, and refluxed in a water bath at 80°C for 6-24 hours; the pH value of the reaction product is adjusted to between 8 and 10 with ammonia water, and the organic siloxane is continuously added and stirred for 6-12 hours to obtain a silicon-titanium sol;

[0031] The acidic hydroalcoholic solvent is a mixed solvent formed by water and at least one of ethanol and isopropanol, and the pH value is adjusted to between 2 and 5 with nitric acid, and the mass of water accounts for 10 to 20% of the total mass of the mixed solvent. The organosiloxane is at least one of γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, and γ-aminopropyltrimethoxysilane. The amount of each component is controlled so that the mass ratio of butyl titanate: acidic hydroalcoholic solvent: organosiloxane is 1:20 to 50:1 to 5.

[0032] (2) Take 1 mass part of a silver / zinc ion mixed aqueous solution with a mass percentage concentration of 5-20%, wherein the silver / zinc ion mixed aqueous solution is an aqueous solution prepared by mixing silver nitrate and zinc nitrate at a mass ratio of 1:4 to 1:1. Add 0.5-1.5 mass parts of 28% concentrated ammonia water thereto, and react for 0.5-5 hours under stirring; add the reaction product to the silicon-titanium sol prepared in step (1) at a mass ratio of 1:200 to 1:20, stir for 1 hour, and then age for 12 hours to obtain a functional nanocomposite sol with taste inhibition.

[0033] The prepared odor-inhibiting functional nanocomposite sol is used as a soaking liquid for VOCs degradation of fiberboards, which specifically includes soaking the fiberboard in the nanocomposite sol for 15 to 90 minutes, taking it out and drying it.

[0034] The following are eight examples of successful preparation methods for odor-inhibiting functional nanocomposite sols. The test data in each example is shown in Table 1 below.

[0035] In each example, 1 part by mass of butyl titanate and 1 part by mass of a mixed aqueous solution of silver / zinc ions are used. All reaction raw materials or reagents used are commercially available products, and the reagents used can be prepared using commercially available reagents.

[0036] Table 1 Example data table

[0037]

[0038] Examples of applications and verification methods:

[0039] (1) Test materials and equipment

[0040] Fiberboard with dimensions of 15cm×15cm×0.1cm in length×width×thickness, totaling 64 pieces; a glove box with dimensions of 60cm×60cm×80cm, with a downward-blowing fan and a 24W LED white light source installed on the top of the glove box; Japan Riken GX-6000 gas detector.

[0041] (2) Each group of 8 fiberboards is made into a group (8 pieces are made in the same group to reduce the error). Each group is tested according to the following operating steps:

[0042] a. Put 8 fiberboards into the glove box and place it directly under the light source. Seal the glove box, turn on the light source, and after sealing at 30℃ for 24 hours, use a gas detector to test the VOCs concentration in the glove box, which is recorded as a 0 .

[0043] b. Take out 8 fiberboards and soak them in the odor-inhibiting functional nanocomposite sol prepared in a certain embodiment. After soaking for 15 minutes, take out the fiberboards and stand them vertically for 5 minutes to drain the excess sol on the surface, and then bake them at 80°C for 1 hour to obtain fiberboards treated with odor-inhibiting treatment.

[0044] c. Put the 8 fiberboards treated with odor suppression into the glove box and place them directly under the light source. Seal the glove box, turn on the light source, and after sealing at 30°C for 24 hours, use a gas detector to test the VOCs concentration in the glove box, which is recorded as a t .

[0045] d. The VOCs removal rate P can be calculated by the following formula to characterize the odor suppression performance of the nanocomposite sol prepared in this embodiment.

[0046]

[0047] Technical effect verification:

[0048] As can be seen from Table 1, the odor suppression performance of the nanocomposite sol obtained in the present invention is between 78% and 95%, which is generally higher than the odor suppression performance of 60% to 80% of the existing typical modified titanium dioxide coating, which is sufficient to show its technical superiority.

[0049] Finally, it should be noted that the above examples are only specific implementation examples of the present invention. Obviously, the present invention is not limited to the above examples, and there are many variations. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A method for preparing a taste-inhibiting functional nanocomposite sol, characterized in that: The steps include: (1) Firstly dissolve butyl titanate in an appropriate amount of alcohol solvent, then dropwise add the mixed solution into an acidic water-alcohol solvent, and reflux for 6 to 24 hours in a water bath at 80° C.; adjust the pH value of the product to alkaline, continue to add organosiloxane and stir for 6 to 12 hours to obtain a silicon-titanium sol; The amount of each component is controlled so that the mass ratio of butyl titanate: acidic water-alcohol solvent: organic siloxane is 1:20-50:1-5; (2) Take 1 part by mass of a mixed aqueous solution of silver / zinc ions with a mass percentage concentration of 5-20%, add 0.5-1.5 parts by mass of concentrated ammonia water thereto, and react for 0.5-5 hours under stirring; add the reaction product to the silicon-titanium sol prepared in step (1) at a mass ratio of 1:200-1:20, stir for 1 hour, and then age for 12 hours to obtain a functional nano-composite sol with odor suppression function.

2. The method according to claim 1, characterized in that In the step (1), the mass ratio of butyl titanate to alcohol solvent is 1:10-20, and the alcohol solvent is at least one of ethanol and isopropanol.

3. The method according to claim 1, characterized in that In the step (1), the acidic hydroalcoholic solvent is a mixed solvent formed by water and at least one of ethanol and isopropanol, and the pH value is adjusted to between 2 and 5 with nitric acid, and the mass of water accounts for 10 to 20% of the total mass of the mixed solvent.

4. The method according to claim 1, characterized in that: In the step (1), the rate of adding the mixed solution dropwise is controlled at 2 ml / min.

5. The method according to claim 1, characterized in that In the step (1), the pH value of the previous reaction product is adjusted to between 8 and 10 using aqueous ammonia.

6. The method according to claim 1, characterized in that In the step (1), the organosiloxane is at least one of γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane and γ-aminopropyltrimethoxysilane.

7. The method according to claim 1, characterized in that In the step (2), the silver / zinc ion mixed aqueous solution is an aqueous solution prepared by mixing silver nitrate and zinc nitrate in a mass ratio of 1:4 to 1:

1.

8. The method according to claim 1, characterized in that In the step (2), the mass fraction of the concentrated ammonia water is 28%.

9. The method for applying the odor-inhibiting functional nanocomposite sol prepared by the method according to any one of claims 1 to 8, characterized in that: It is used as a soaking liquid for VOCs degradation of fiberboard.

10. The method according to claim 9, characterized in that The fiberboard is immersed in the nanocomposite sol for 15 to 90 minutes, taken out and dried.

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