CN205152590U - Photocatalyst nano-TiO2 fabric production unit - Google Patents

Abstract

The utility model discloses a photocatalyst nano TiO₂An integrated plant for the production of textiles, comprising the preparation of a photocatalystNano TiO 2₂A hydrosol preparation device and a fabric consolidation device; the hydrosol preparation device comprises a pre-preparation groove, a dropwise adding reaction kettle and an aging reaction kettle; the fabric consolidation device comprises a fabric conveying roller way and a nano TiO photocatalyst₂A soaking and rolling tank, a rolling and pressing roller, a cloth guiding device and a shaping and drying device for hydrosol; the aging reaction kettle is communicated with the padding groove. The production line has reasonable configuration and meets the requirements of photocatalyst nano TiO₂Industrialized production of fabric to prepare photocatalyst nano TiO on the surface of photocatalyst fabric₂The solid content is more than or equal to 80 percent, and the production efficiency is high.

Description

Photocatalyst nano-TiO2 fabric production unit

technical field

The utility model relates to the production field of photocatalyst products, in particular to a photocatalyst nano _TiO2 fabric production combined device.

Background technique

Photocatalyst is a general term for photo-semiconductor materials with photocatalytic function represented by nano-scale _TiO2 . It is an ideal material for controlling indoor environmental pollution in the world. Effectively degrade toxic and harmful gases such as formaldehyde in the air, can effectively kill a variety of bacteria, the antibacterial rate is as high as 99.99%, and can decompose and harmlessly treat the toxins released by bacteria or fungi. Dirt and other functions.

In recent years, due to the emergence of "decoration pollution syndrome", the problem of indoor environmental pollution has become a hot spot of concern. According to authoritative reports, more than 70% of household decoration pollution in my country exceeds the standard, and the pollution seriously exceeds the standard by more than 30%. It will not only cause pneumonia, bronchitis, leukemia, cerebral thrombosis and other diseases, but also may cause a series of diseases such as miscarriage of pregnant women and malformation of newborns.

Finish nano TiO ₂ on the surface of the fabric to form a photocatalyst product to meet the "safety needs" of consumers, and the market prospect is extremely broad. As mentioned above, under the irradiation of light, the photocatalyst will produce a photocatalytic reaction similar to photosynthesis, produce free hydroxyl groups and active oxygen with strong oxidation ability, and have a strong photoredox function, so the unit volume of the photocatalyst The larger the surface area of the photocatalyst, the stronger the effect of the photocatalytic reaction, and the more free hydroxyl groups and active oxygen are produced. It can be said that the particle size is a key indicator of the quality of the photocatalyst, which requires the photocatalyst to be prepared and subsequently stored and used. In the process, not only the particle size of _TiO2 should be small enough, but also TiO2 should not be agglomerated, which will affect the photoreactive area. However, the current preparation method of hydrosol is to pour butyl titanate into acid solution and mix it. Defects in the following two areas:

One is that TiO ₂ higher than 30 nanometers can only be used as a raw material. If TiO 2 is used as a raw material lower than 30 nanometers, _{TiO 2} must be agglomerated during the preparation, which not only wastes resources, but also cannot prepare high-content TiO ₂ Hydrosols, while agglomeration continues to occur during subsequent storage and use (although liquid-solid separation of precipitated agglomerates is done during the preparation process, small agglomerates that do not form precipitates still remain in the hydrosol, during storage These small aggregates will continue to agglomerate), making the TiO ₂ in the obtained hydrosol extremely unstable, and the TiO ₂ content in the hydrosol will gradually decrease with the storage time.

The second is TiO ₂ above 30 nanometers, the bandgap energy between its energy band and conduction band is 5.127×10 ^-19 J, and its energy is equivalent to ultraviolet light with a wavelength of 387.5nm, which can only be irradiated by ultraviolet light below 388nm The photocatalytic reaction has specific requirements for light, which limits the use environment of the carrier, that is, in an environment without ultraviolet light, it will not have the effect of degrading toxic and harmful gases such as formaldehyde in the air, and killing various bacteria.

When the size of the particle is in the range of 1-10 nanometers, there will be a quantum effect, and it will become a quantized particle, and the band gap will obviously be widened. The electron-hole has a stronger redox ability, and the catalytic activity will increase with the degree of size quantization. And increase, so that the ideal effect can also be achieved under normal light. Preparation of photocatalyst TiO ₂ hydrosol with 1-10 nanometer TiO ₂ , so that the carrier can undergo photocatalytic reaction under normal light, and benefit consumers is a technical problem urgently needed to be solved by scientific and technological workers in this industry.

At the same time, how to attach nano-scale TiO ₂ to the fabric carrier and obtain photocatalyst fabric with high solid content, so it is particularly important to design a reasonable photocatalyst TiO ₂ fabric production line to realize industrial production.

Utility model content

The technical problem to be solved by the utility model is to provide a photocatalyst nano- _TiO2 fabric production combined device, the production line configuration is reasonable, the photocatalyst nano- _TiO2 hydrosol system produced is stable, the content is high, it is arranged on the fabric carrier, and the nano-TiO2 on the photocatalyst fabric ₂ The solid content of the particles is over 80%, and the production efficiency is greatly improved.

The utility model is realized through the following technical solutions:

Photocatalyst nano- _TiO2 fabric production unit, including hydrosol preparation unit and fabric consolidation unit;

The hydrosol preparation device includes a pre-allocation tank, a dripping reactor and an aging reactor;

The fabric consolidating device includes a fabric conveying roller table arranged in sequence, a padding tank filled with hydrosol, a pressing roller, a cloth guiding device, and a shaping and drying device;

The aging reactor is communicated with the padding tank, or the aging reactor is communicated with the storage tank, and the padding tank is communicated with the storage tank.

The pre-mixing tank is provided with a stirring device for preparing a homogeneous solution of butyl titanate;

The dripping reactor is equipped with a stirring device for preparing the inorganic acid solution; and is provided with a dropping device or a mist spraying device for dripping or misting the butyl titanate homogeneous solution prepared in the pre-mixed tank Into the constantly stirring inorganic acid solution to participate in the system reaction;

The aging reaction kettle is used to seal the dispersion liquid that has been dripped into the reaction kettle and leave it to stand for an aging reaction to obtain photocatalyst nano TiO ₂ water sol;

The fabric is conveyed to the padding tank equipped with photocatalyst nano- _TiO2 hydrosol through the conveying roller table, and passes through the photocatalyst nano- _TiO2 hydrosol in the padding tank. The padding tank is equipped with a heat preservation device, and the temperature of the hydrosol is maintained at 20 ~60°C, the fabric walking speed is 20-40 m/min; after the fabric comes out of the padding tank, it is rolled by rolling rollers, cloth-drawing device is used to guide the cloth, and the shaping drying device is dried to obtain the photocatalyst fabric. The drying temperature of the shaping is 160～180℃.

The further improvement scheme of the utility model is that, according to the size of the liquid surface, at least one dripper is set for every 50-80 square centimeters in the dripping reactor.

The further improvement of the utility model is that the pre-dispensing tank and the dripping device or the mist spraying device of the dripping reactor, and the dripping reactor and the aging reactor are connected through pumps respectively. The material is conveyed by the pump to improve work efficiency.

A further improvement of the utility model is that the aging reaction kettle is connected to a decompression device and communicated with a tubular heat exchanger outside the kettle.

Compared with the prior art, the utility model has the following obvious advantages:

1. As stated in the background technology, the particle size and content of TiO2 in the hydrosol are the key indicators of the quality of the photocatalyst, but the nanoscale TiO2 hydrosol is extremely unstable in the production reaction system, and it is easy to agglomerate and precipitate. As a result, the photoreactive surface area and content of TiO2 are reduced, which ultimately affects the photocatalytic performance of photocatalyst products. After long-term experiments, the research and development personnel concluded that it is particularly important to dissolve the homogeneous solution of butyl titanate in the production of photocatalyst TiO2 aqueous sol in the inorganic acid solution under stirring by dripping and spraying. Equipment that can realize the production process.

2. Negative pressure distillation of the aged hydrosol can not only remove the peculiar smell caused by ethanol and negative reactant butanol, but also increase the pH value of the hydrosol to 2-3, making it stable during storage. Add distilled water to adjust the PH value to 3~4 in the later use. After adding to the surface of the fabric, the PH value will be close to 7 through ventilation, drying and other processes, so as to achieve the effect of no peculiar smell and no corrosion. The utility model is connected with a decompression device in the aging reaction kettle, and communicates with the tubular heat exchanger outside the kettle, and satisfies the negative pressure distillation process after the aging reaction.

Description of drawings

Fig. 1 is the schematic diagram of the utility model production line.

detailed description

As shown in Figure 1, the utility model includes hydrosol preparation device and fabric consolidation device;

The hydrosol preparation device comprises a pre-allocation tank 11, a dropping reactor 12 and an aging reactor 15;

The fabric consolidating device comprises a fabric conveying roller table 22 arranged in sequence, a padding tank 23 equipped with a photocatalyst _TiO hydrosol, a pressing roller 24, a cloth guiding device 25, and a shaping drying device 26;

The aging reactor 15 communicates with the padding tank 23 through a storage tank 19 .

The pre-mixing tank 11 is provided with a stirring device 17 for preparing a homogeneous solution of butyl titanate;

The dripping reactor 12 is provided with a stirring device 17 for preparing an inorganic acid solution; and is provided with a dripping device 13 (or a mist spray device) for dissolving the butyl titanate homogeneous solution prepared in the pre-mixed tank Add dropwise or spray mist into the continuously stirring inorganic acid solution to participate in the system reaction; set a dropper for at least every 50-80 square centimeters according to the size of the liquid level in the dripping reactor.

Described aging reaction kettle 15, is used for the dispersion liquid that reaction is completed in dripping reaction kettle is carried out sealing and leaving standstill aging reaction to obtain photocatalyst nanometer TiO ₂ water sol;

The aging reaction kettle 15 is connected to the decompression device 14, and is connected to the tubular heat exchanger 16 outside the kettle, and is used to carry out negative pressure distillation on the aged hydrosol to remove ethanol and negative reactants such as butanol. At the same time, it can increase the pH value of the hydrosol to 2.0-3.0.

Fabric 21 is sent to the padding tank 23 that photocatalyst _TiO2hydrosol is housed through conveying roller table 22, and passes through from the photocatalyst _TiO2hydrosol in the padding tank, is provided with insulation device 28 in the padding tank 23, water The temperature of the sol is maintained at 20-60°C, and the fabric walking speed is 20-40 m/min; after the fabric 21 leaves the padding tank, it is rolled and pressed by the rolling roller 24, the fabric is drawn by the fabric introduction device 25, and the shaping drying device 26 is shaped and dried. The photocatalyst fabric is obtained, and the setting drying temperature is 160-180°C.

The pre-allocation tank 11 is communicated with the dripping device 13 (or mist spraying device) of the dripping reactor, and the dripping reactor 12 and the aging reactor 15 are communicated through pumps 18 respectively.

The particle size of TiO ₂ in the photocatalyst nano-TiO ₂ hydrosol in the padding tank 23 is 1-10 nanometers, the pH value of the photocatalyst nano-TiO ₂ hydrosol is 3.0-4.0, and the TiO ₂ content is above 2.8%.

The fabric is fiber cloth.

Photocatalyst nano TiO ₂ fabric production process:

(1) Take butyl titanate and organic solvent in parts by weight of 0.9-1:1, dissolve butyl titanate in the organic solvent at room temperature to form a homogeneous butyl titanate solution, stir well and set aside;

(2) Mix inorganic acid and water at room temperature to obtain a PH=1.5-3.5 inorganic acid solution, stir well and set aside;

(3) Add the butyl titanate homogeneous solution into the stirred inorganic acid solution by dropping or spraying at 20°C to 60°C to obtain a milky white dispersion. The dropping rate is not faster than 2 drops/s. The volume of dripping titanate ethanol solution is 0.04-0.07ml; the weight ratio of butyl titanate homogeneous solution to inorganic acid solution is 1:3-5; according to the liquid level of the inorganic acid solution, at least one is set every 50-80 square centimeters dripper.

(4) Continue to stir for more than 1 hour after the dropwise addition to obtain a milky white dispersion;

(5) Pump the water dispersion in the dripping reaction kettle into the aging reaction kettle through a chemical centrifugal pump, seal the dispersion and let it stand for more than 120 hours to form a light yellow translucent nano-TiO ₂ hydrosol;

(6) After aging, reduce the pressure in the aging reactor to a negative pressure of 0.07-0.15 MPa through a decompression device, and distill the nano-TiO ₂ hydrosol to remove ethanol and negative reactants such as butanol. To avoid odor, control the pH value of TiO ₂ hydrosol to 2.0-3.0.

When finishing the fabric, add distilled water to the hydrosol to adjust the pH value to 3.0-4.0, and transfer it to the padding tank.

The fabric is transported to the padding tank filled with photocatalyst TiO ₂ hydrosol through the conveying roller, and passes through the photocatalyst nano-TiO ₂ hydrosol in the padding tank. 40 m/min; after the fabric leaves the leaching tank, it is rolled and pressed, introduced, and shaped and dried to obtain a photocatalyst fabric. The shaped drying temperature is 160-180°C.

The photocatalyst nano TiO ₂ solid content on the surface of the prepared photocatalyst fabric is ≥80%.

Claims (6)

1. Photocatalyst nano-TiO ₂ fabric production combined device, characterized in that: it includes a hydrosol preparation device and a fabric consolidation device; The hydrosol preparation device includes a pre-mixing tank (11), a dropping reactor (12) and an aging reactor (15); The fabric consolidating device includes a fabric conveying roller table (22), a padding tank (23) filled with hydrosol, a calendering roller (24), a cloth guiding device (25), a shaping drying device (26) arranged in sequence. ); The aging reactor (15) communicates with the padding tank (23), or the aging reactor (15) communicates with the storage tank (19), and the padding tank (23) communicates with the storage tank (19). 2. photocatalyst nanometer TiO according to claim ₁ fabric production combined device, it is characterized in that: The pre-mixing tank (11) is provided with a stirring device (17); The dripping reactor (12) is provided with a stirring device (17); and a dripping device (13) or a mist spraying device. 3. photocatalyst nanometer TiO according to claim ₁ fabric production combined device, it is characterized in that: The fabric (21) is transported to the padding tank (23) equipped with photocatalyst nano-TiO ₂ hydrosol through the conveying roller table (22), and passes through the photocatalyst nano-TiO ₂ hydrosol in the padding tank. A thermal insulation device (28) is provided, and after the fabric leaves the padding tank, it is rolled by a rolling roller (24), a cloth guiding device (26) is used to guide the cloth, and a shaping drying device (26) is dried to obtain a photocatalyst fabric. 4. The integrated device for producing photocatalyst nano-TiO ₂ fabric according to claim 1, characterized in that: according to the size of the liquid level in the dripping reactor (12), at least one dripper is set for every 50-80 square centimeters. 5. The photocatalyst nano- _TiO2 fabric production combined device according to claim 1, characterized in that: between the pre-configured tank (11) and the dripping device (13) or mist spraying device of the dripping reactor, dripping The feeding reaction kettle (12) and the aging reaction kettle (15) are connected through pumps (18). 6. The photocatalyst nano- _TiO2 fabric production combined device according to claim 1, characterized in that: the aging reaction kettle (15) communicates with the decompression device (14), and is connected with the tubular heat exchanger outside the kettle ( 16) Connectivity.