Preparation method of a taste-suppression functional nano-composite sol

Abstract

The present application relates to environmental purification material preparation technology, aiming at providing a preparation method of a smell-inhibiting functional nanocomposite sol. The method comprises the following steps: dissolving butyl titanate into an appropriate amount of alcohol solvent, then adding an acidic hydroalcoholic solvent dropwise to perform a reaction; adjusting the product to be alkaline, continuously adding organosiloxane and stirring to perform a reaction, to obtain a silicon-titanium sol; adding concentrated ammonia water to a silver / zinc ion mixed aqueous solution to perform a reaction, then adding the silicon-titanium sol into the solution to stir and age, to obtain a smell-inhibiting functional nanocomposite sol. In actual application, the nanocomposite sol can utilize the excellent permeability and film-forming property of the nanosol, uniformly form a film along the inner wall of the micrometer-level pore of the fiberboard and firmly load, so as to realize the inhibition of the release of volatile organic compounds, the photocatalytic degradation of aldehyde / aromatic hydrocarbon organic pollutants and the chemical adsorption of aromatic hydrocarbon / olefin, thereby finally realizing the release control and efficient capture and removal of the odor compound molecules of the fiberboard.

Description

TECHNICAL FIELD

[0001] The present application relates to the preparation technology of environmental purification materials, in particular to a preparation method of a flavor-inhibiting functional nanocomposite sol. BACKGROUND

[0002] Fiberboard is an important kind of man-made board, which is widely used in the fields of building and home, commodity packaging, automotive interior, electronic circuit board processing, etc. Fiberboard is mainly prepared by mixing fibers made of branch wood, wood processing residues and other wood resources with adhesives and other additives, and then forming and hot pressing. Wood is rich in extracts and volatile oils, and the contents of acidification, organic additives and other residues can release volatile organic compounds (VOCs), produce irritating odor, and the types and sources of VOCs released by ultra-thin fiberboard are complex, among which aldehydes, aromatic hydrocarbons and alkanes are the main components of irritating odor, which accounts for nearly 90%, which poses a great challenge to the odor control of ultra-thin fiberboard.

[0003] At present, researchers have proposed a series of control methods for the release of VOCs, mainly including adhesive process and production process control, adding adsorbents, oxidizing agents, antioxidants, physical finishing and surface chemical finishing. For example, Tsinghua University studied the influence of temperature on the emission of formaldehyde and VOCs from board, and confirmed that heat treatment is an effective method to reduce the odor emission of board. Research by Northeast Forestry University shows that PVC covering surface can effectively prevent the release of volatile organic compounds and odor to some extent. Columbia University research shows that adding some nanoparticles in water-based paint can reduce the emission of volatile pollutants, and as a photocatalyst and adsorbent, it can effectively remove odor and formaldehyde.

[0004] Based on the characteristics of various treatment technologies, nano-titanium dioxide photocatalytic purification technology is considered 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 the problems of easy agglomeration and low photocatalytic reaction efficiency, which limits the application of titanium dioxide photocatalytic technology in the degradation of VOCs in fiberboard.

[0005] Therefore, it is necessary to propose a new scheme to solve the above problems. SUMMARY

[0006] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a preparation method of a flavor-inhibiting functional nanocomposite sol.

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

[0008] The application provides a preparation method of a taste-reducing functional nano composite sol, which comprises the following steps.

[0009] (1) Dissolve tetrabutyl titanate into a proper amount of alcohol solvent, then drop the mixture into an acidic water-alcohol solvent, and reflux the mixture at 80 DEG C for 6-24 hours in a water bath; adjust the pH value of the product to alkaline, continuously add organosiloxane and stir for 6-12 hours to obtain a silicon-titanium sol;

[0010] Control the amount of each component, so that the mass ratio of tetrabutyl titanate: acidic water-alcohol solvent: organosiloxane is 1:20-50:1-5;

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

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

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

[0014] As a preferred scheme of the application, in step (1), the dropping rate of the mixture is controlled at 2 ml / min.

[0015] As a preferred scheme of the application, in step (1), the pH value of the previous reaction product is adjusted to 8-10 by ammonia water.

[0016] As a preferred scheme of the application, in step (1), the organosiloxane is at least one of gamma-aminopropyl triethoxysilane, N-(beta-aminoethyl)-gamma-aminopropyl trimethoxysilane and gamma-aminopropyl trimethoxysilane.

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

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

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

[0020] As a preferred scheme of the application, the fiberboard is soaked in the nanocomposite sol for 15-90 minutes, and then dried after being taken out.

[0021] The implementation principle of the application is as follows:

[0022] In the actual application process of the nanocomposite sol, the nanocomposite sol can be uniformly formed along the inner wall of the micrometer-sized pores of the fiberboard and firmly loaded by using the excellent permeability and film-forming property of the nanosol, so as to realize the following functions: inhibition of volatile organic compounds by the film layer, photocatalytic degradation of aldehydes / aromatic hydrocarbons and other organic pollutants by the titanium dioxide nanoparticles, and chemical adsorption of aromatic hydrocarbons / olefins by silver / zinc ions, thereby finally realizing the release control and efficient capture and removal of odor compound molecules of the fiberboard.

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

[0024] 1. The nanoscale titanium dioxide sol modified by organosilicon is prepared by the sol-gel method, and the odor-inhibiting ability of the material to VOCs of the fiberboard can be synergistically improved by the combination with silver / zinc complex ions.

[0025] 2. The odor-inhibiting functional nanocomposite sol prepared by the application overcomes the agglomeration problem of the traditional nanoscale titanium dioxide powder when directly applied to the coating purification material.

[0026] 3. The odor-inhibiting functional nanocomposite sol prepared by the application has excellent permeability, can penetrate into the micrometer-sized pores of the fiberboard, and is formed along the inner wall of the pores to realize uniform and firm loading of the functional components, thereby avoiding the significant influence of the traditional coating purification material on the appearance of the fiberboard.

[0027] 4. The application organically combines the inhibition of volatile organic compounds by the gel film layer, the photocatalytic degradation of titanium dioxide, and the chemical adsorption of silver / zinc ions, thereby making up for the low photocatalytic reaction efficiency of single titanium dioxide, and realizing the release control and efficient capture and removal of different odor compound molecules of the fiberboard. DETAILED DESCRIPTION

[0028] The application will be further described in detail below in combination with specific embodiments, and the embodiments can enable the skilled in the art to more comprehensively understand the application, but do not limit the application in any way.

[0029] The preparation method of the odor-inhibiting functional nanocomposite sol provided by the application includes the following steps:

[0030] (1) First, butyl titanate is dissolved in an alcohol solvent, the mass ratio of butyl titanate: 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 into an acidic water-alcohol solvent at a rate of 2 ml / min, and refluxed at 80°C water bath for 6-24h; the pH value of the reaction product is adjusted to 8-10 by using ammonia water, and then organosiloxane is continuously added and stirred for 6-12h to obtain a silicon-titanium sol;

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

[0032] (2) Take 1 mass part of a silver / zinc ion mixed aqueous solution with a mass percentage concentration of 5-20%, and the silver / zinc ion mixed aqueous solution is an aqueous solution prepared by mixing silver nitrate and zinc nitrate at a mass ratio of 1:4-1:1. 0.5-1.5 mass parts of concentrated ammonia water with a mass fraction of 28% is added thereto, and stirred for 0.5-5h; the reaction product is added to the silicon-titanium sol prepared in step (1) at a mass ratio of 1:200-1:20, stirred for 1h, and aged for 12h to obtain a deodorant functional nanocomposite sol.

[0033] The deodorant functional nanocomposite sol obtained is used as a soaking solution for VOCs degradation of fiberboard in application. Specifically, the fiberboard is soaked in the nanocomposite sol for 15-90min, and then taken out and dried.

[0034] The following describes the preparation method of the deodorant functional nanocomposite sol prepared in eight examples, and the test data of each example is shown in Table 1.

[0035] In each example, 1 mass part of butyl titanate and 1 mass part of silver / zinc ion mixed aqueous solution are used. Each reaction raw material or reagent used is a commercially available product, and the reagent used can be configured by using a commercially available product.

[0036] Table 1 Example Data Table

[0037]

[0038] Application and verification method examples:

[0039] (1) Test materials and devices

[0040] Fiber plates with the size of 15cm x 15cm x 0.1cm, 64 pieces in total; a glove box with the size of 60cm x 60cm x 80cm, the glove box is provided with a fan blowing downward and a 24W LED white light source on the top; a Japan Riken GX-6000 gas detector.

[0041] (2) 8 pieces of fiber plates as a group (8 pieces in the same group are to reduce errors), each group is tested according to the following operation steps:

[0042] a, 8 pieces of fiber plates are placed in the glove box and placed directly below the light source. The glove box is closed, the light source is turned on, after 24 hours of sealing at 30℃, the VOCs concentration in the glove box is tested by the gas detector, and is recorded as a0.

[0043] b, 8 pieces of fiber plates are taken out and soaked in the odor suppression functional nanocomposite sol prepared in the embodiment. After soaking for 15min, the fiber plates are vertically placed for 5min to drain the excess sol on the surface, and then baked at 80℃ for 1h to obtain the odor suppression treated fiber plates.

[0044] c, 8 pieces of odor suppression treated fiber plates are placed in the glove box and placed directly below the light source. The glove box is closed, the light source is turned on, after 24 hours of sealing at 30℃, the VOCs concentration in the glove box is tested by the gas detector, and 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 the embodiment.

[0046]

[0047] Technical effect verification:

[0048] As can be seen from Table 1, the odor suppression performance of the nanocomposite sol obtained by the present application is between 78-95%, which is generally higher than the odor suppression performance of 60-80% 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 enumeration is only a specific embodiment of the present application. Obviously, the present application is not limited to the above embodiment, but can have many variations. All variations that can be directly derived or inferred by those skilled in the art from the disclosed content of the present application should be considered as the protection scope of the present application.

Claims

1. A method for preparing a nano-composite sol with odor suppression function, characterized in that, The method comprises the following steps: (1) dissolving butyl titanate into a proper amount of alcohol solvent, then dropping the mixture into an acidic water-alcohol solvent, refluxing the mixture at 80℃ for 6-24 hours, adjusting the pH value of the product to alkaline, adding organosiloxane and stirring for 6-12 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: organosiloxane is 1:20-50:1-5; (2) adding 0.5-1.5 parts by mass of concentrated ammonia water to 1 part by mass of a silver / zinc ion mixed aqueous solution with a mass percentage concentration of 5-20%, and stirring and reacting for 0.5-5 hours; adding the reaction product to the silicon-titanium sol obtained in step (1) at a mass ratio of 1:200-1:20, stirring for 1 hour, and aging for 12 hours to obtain a nano-composite sol with odor control function.

2. The method of claim 1, wherein, In 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.

3. The method of claim 1, wherein, In step (1), the acidic water-alcohol solvent is a mixed solvent of water and at least one of ethanol and isopropanol, and the pH value is adjusted to 2-5 by nitric acid, and the mass of water accounts for 10-20% of the total mass of the mixed solvent.

4. The method of claim 1, wherein, In step (1), the dropping rate of the mixture is controlled at 2 ml / min.

5. The method of claim 1, wherein, In step (1), the pH value of the previous reaction product is adjusted to 8-10 by ammonia water.

6. The method of claim 1, wherein, In step (1), the organosiloxane is at least one of γ-aminopropyl triethoxysilane, N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane, and γ-aminopropyl trimethoxysilane.

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

1.

8. The method of claim 1, wherein, In step (2), the mass fraction of the concentrated ammonia water is 28%.

9. The application method of the odor control functional nanocomposite sol prepared by the method of any one of claims 1 to 8, characterized in that, The nano-composite sol is used as a soaking liquid for fiberboard VOCs degradation.

10. The method of claim 9, wherein, The fiberboard is soaked in the nano-composite sol as a whole for 15-90 minutes, and then dried after being taken out.

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