Multifunctional water-absorbent resin based on traditional Chinese medicine residue components as well as preparation method and application of multifunctional water-absorbent resin

Abstract

The invention belongs to the field of water-absorbent resin materials, and particularly relates to multifunctional water-absorbent resin based on traditional Chinese medicine residue components, a preparation method and application. The preparation method comprises the following steps: S1, cleaning, drying and crushing traditional Chinese medicine residues, and sieving to obtain traditional Chinese medicine residue powder; s2, soaking the traditional Chinese medicine residue powder by using a NaOH solution; heating in a water bath, adding a NaOH solution with the concentration of 15%, stirring and mixing, and carrying out alkalization reaction to obtain an alkalized solution; s3, heating the alkalized solution, then rapidly dropwise adding a sodium chloroacetate aqueous solution, carrying out etherification reaction to obtain an etherified solution, drying the etherified solution, and extracting fiber wood components in the medicine residues; s4, mixing the fiber wood component, an acrylic monomer, a cross-linking agent and an initiator, and carrying out polymerization reaction to generate super absorbent resin with a hydrophilic group; s5, extracting aroma components from the traditional Chinese medicine residues to prepare essential oil for later use; and S6, compounding the essential oil and the super absorbent resin to prepare the multifunctional water-absorbent resin based on the traditional Chinese medicine residue components.

Description

Technical Field

[0001] The present invention belongs to the technical field of water-absorbing resin materials, and particularly relates to a multifunctional water-absorbing resin based on Chinese medicine residue components, a preparation method and an application thereof. Background Art

[0002] Superabsorbent resin is a functional polymer material that can absorb and retain a large amount of water, and is widely used in sanitary products, agriculture, construction and other fields. However, traditional superabsorbent resins are mainly made from petrochemical products, which have problems such as high resource consumption and serious environmental pollution. At the same time, the functions of traditional superabsorbent resins are relatively single and difficult to meet diverse application requirements. Chinese medicine residues contain rich fiber lignin components and natural aroma components, and have high development and utilization value. Traditional treatment methods for Chinese medicine residues include incineration, landfill and simple fertilization, but there are problems such as low efficiency, high cost, possible secondary pollution and resource waste. The existing technology cannot efficiently treat the increasing amount of Chinese medicine residues, and cannot meet the environmental protection and diverse needs in the preparation of superabsorbent resins.

[0003] Therefore, the present invention provides a multifunctional water-absorbing resin based on Chinese medicine residue components, a preparation method and an application thereof. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the present invention aims to achieve the efficient utilization of Chinese medicine residue resources, environmental protection and emission reduction, create economic benefits and optimize material properties. Specifically, activated carbon is made from Chinese medicine residues through a simple process, and the moisture absorption capacity is greatly improved. The components of Chinese medicine can also play the role of aromatherapy and body conditioning. Applying Chinese herbal medicine to dehumidification products can combine the concepts and effects of traditional Chinese medicine and better meet people's needs for traditional culture. The dehumidification products prepared from Chinese medicine residues not only have unique Chinese herbal medicine curative effects, but also can reduce production costs, improve product competitiveness and bring considerable economic benefits to enterprises.

[0005] The object of the present invention can be achieved by the following technical solutions:

[0006] A preparation method of a multifunctional water-absorbing resin based on Chinese medicine residue components, the preparation method comprising the following steps:

[0007] S1. Wash, dry, crush and sieve Chinese medicine residues to obtain Chinese medicine residue powder;

[0008] S2. Soak the Chinese medicine residue powder with NaOH solution; then heat in a water bath and add 15% NaOH solution to stir and mix for alkalization reaction to obtain an alkalized solution;

[0009] S3. Heat the alkalized solution, then quickly drop in an aqueous solution of sodium chloroacetate for an etherification reaction to obtain an etherified solution, and then dry the etherified solution to extract the fibrous lignin component in the medicinal residues.

[0010] S4. Mix the fibrous lignin component, acrylic monomer, crosslinking agent, and initiator for a polymerization reaction to generate a highly water-absorbent resin with hydrophilic groups.

[0011] S5. Extract the aroma components from the Chinese medicine residues to prepare essential oils for standby.

[0012] S6. Compound the essential oils with the highly water-absorbent resin to prepare a multifunctional water-absorbent resin based on the components of Chinese medicine residues.

[0013] Further, the powdered Chinese medicine residues after crushing in step S1 need to pass through 40 meshes.

[0014] Further, in step S2, the concentration of the NaOH solution for soaking is 0.15 mol / L; the temperature for water bath heating is 30 - 40 °C; the alkalization reaction time is 2 - 3 h.

[0015] Further, in step S3, the temperature for heating the alkalized solution is 65 - 75 °C; the concentration of the aqueous solution of sodium chloroacetate is 0.19 mol / L; the dropping rate of the aqueous solution of sodium chloroacetate is 10 - 15 drops / second; the etherification reaction time is 2 - 3 h.

[0016] Further, in step S4, the mass ratio of the fibrous lignin component, acrylic monomer, crosslinking agent, and initiator is 1:9:0.0015:0.25.

[0017] Further, the crosslinking agent is an N,N'-methylenebisacrylamide solution; the initiator is K2S2O8.

[0018] Further, the specific preparation steps of the essential oils in step S5 are: first, adopt the distillation technology to extract the aroma components in the Chinese medicine residues by steam distillation; the temperature during distillation is 100 °C; then purify the extracted aroma components by vacuum distillation to obtain high-concentration Chinese medicine essential oils.

[0019] Further, the specific operation steps of step S6 are: mix the highly water-absorbent resin with the purified Chinese medicine essential oils at a mass ratio of 1:0.15, and make the Chinese medicine essential oils evenly distributed in the highly water-absorbent resin by the impregnation method.

[0020] A multifunctional water-absorbent resin based on the components of Chinese medicine residues is prepared by the preparation method of a multifunctional water-absorbent resin based on the components of Chinese medicine residues described above.

[0021] The multifunctional water-absorbent resin based on the components of Chinese medicine residues described above is used as a substrate for preparing an air purification device.

[0022] Advantages of the present invention:

[0023] 1. Achieve efficient resource utilization. During the decoction process of traditional Chinese medicine, although most of the medicinal effects have been extracted, there are still some cellulose and other utilizable components remaining in the medicinal residues. By converting these medicinal residues into water-absorbing resins, we can realize the reuse of these resources, thus significantly reducing the generation of traditional Chinese medicine waste and avoiding waste of resources. In addition, using traditional Chinese medicine residues as raw materials to produce water-absorbing resins has significant cost advantages compared with traditional petroleum-based water-absorbing resins. Most traditional methods of recycling traditional Chinese medicine residues are not environmentally friendly and will waste the remaining utilizable resources in the residues. Making water-absorbing resins from residues not only has a lower cost but also can make full use of this effective resource and reduce waste. This low-cost raw material selection helps to reduce the overall production cost and makes the final product more competitive in the market.

[0024] 2. Implement the environmental protection concept and achieve sustainable development. As a biomass resource, traditional Chinese medicine residues have natural degradability. By converting them into water-absorbing resins, we not only realize the reuse of resources but also ensure that these resins can be degraded relatively quickly after being discarded, thus avoiding long-term environmental pollution. Through the reuse of traditional Chinese medicine residues, we effectively reduce the environmental pollution problems caused by the treatment of traditional Chinese medicine waste. Traditional treatment methods, such as incineration or landfill, may cause air pollution and soil pollution. Through this method, we can significantly reduce the occurrence of these environmental problems. The resin itself can also be reused. After absorbing water and being dried, it can absorb water again to achieve recycling.

[0025] 3. Have excellent water absorption performance. Appropriately treated and optimized traditional Chinese medicine residues can be used to prepare resins with excellent water absorption performance. We measure the water absorption effect of the resin in an environment with constant humidity. First, take a certain amount of dried resin and put it into a bottle. After fully absorbing water, take it out and measure the weight to calculate the final mass. It is obtained that in an environment with an air humidity of 100%, the saturated water absorption rate of the resin is between 105.6% - 131.7%, which is much higher than the water absorption rate of 97.3% of traditional calcium chloride. This resin can absorb and retain a large amount of water, making it suitable for a variety of scenarios that require high water absorption performance, such as hygiene products, agricultural irrigation, and other fields. The water-absorbing resin not only has a strong water absorption capacity but also has good water retention performance. In the fields of agriculture and horticulture, this resin can be used as a water-retaining agent, significantly improving the water retention capacity of the soil, thereby reducing the frequency and amount of irrigation and further saving resources. Moreover, the water-absorbing resin can be reused. After appropriate drying, the absorbed water can be removed, enabling the resin to regain its water absorption function.

[0026] 4. It can be widely applied. As a water-retaining agent and plant growth regulator, the water-absorbent resin made from traditional Chinese medicine residues can improve soil structure, increase crop yield and quality. In the fields of sanitary products, industrial packaging, etc., this resin also has wide applications. For example, it can be used as the water-absorbing material for products such as diapers and sanitary napkins. In aspects such as wastewater treatment and oil stain adsorption, the water-absorbent resin made from traditional Chinese medicine residues can also show potential application value.

[0027] 5. Promote circular economy. Converting traditional Chinese medicine residues into high-value water-absorbent resin increases the added value of traditional Chinese medicine waste and brings more economic benefits to enterprises. This conversion process also conforms to the concept of circular economy and helps to promote the traditional Chinese medicine industry to develop in a more environmentally friendly and sustainable direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is the preparation flow chart of the preparation method in the present invention. Figure 2 It is the preparation flow chart of the preparation of high water-absorbent resin using Phellodendron amurense residues in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0031] Example 1 Preparation of Multifunctional High Water-Absorbent Resin Based on Traditional Chinese Medicine Residues

[0032] S1. Put the washed and dried traditional Chinese medicine residues (Phellodendron amurense residues) into a pulverizer for pulverization, and pass through a 40-mesh sieve to obtain traditional Chinese medicine residue powder;

[0033] S2. Put the processed powder into a 100 ml beaker, and soak the traditional Chinese medicine residue powder with NaOH solution; then put it into a water bath at 35 °C to heat and fully dissolve the traditional Chinese medicine residue powder; then add 15% NaOH solution and stir and mix for an alkalization reaction for 2.5 hours to obtain an alkalized solution;

[0034] S3. Place the alkalized solution in a water bath at 70 °C and heat it. Then, quickly drop it into the aqueous solution of sodium chloroacetate at a dropping rate of 15 drops per second for etherification reaction. After 2 hours of reaction, an etherified solution is obtained. Then, dry the etherified solution in an oven at 70 °C for 72 h to obtain phellodendron carboxymethyl cellulose CMC;

[0035] S4. Mix the fibrous lignin component, acrylic monomer, crosslinking agent and initiator for polymerization reaction to generate a superabsorbent resin with hydrophilic groups;

[0036] S5. Extract the aroma components from the Chinese medicine residues and prepare essential oils for later use;

[0037] S6. Compound the essential oil with the superabsorbent resin to prepare a multifunctional absorbent resin based on Chinese medicine residue components.

[0038] Molding process: Make the composite resin into a sheet product, which is suitable for indoor dehumidification and air purification applications.

[0039] Example 2 Preparation of Multifunctional Superabsorbent Resin Based on Chinese Medicine Residues

[0040] Step S1: Pretreatment

[0041] Drying of Chinese medicine residues: Dry at 70 °C for 6 hours to thoroughly remove moisture and impurities and ensure the effect of subsequent treatment.

[0042] Crushing: Use a grinder to crush the dried Chinese medicine residues into particles with a particle size of 0.8 mm to increase the specific surface area and extraction efficiency.

[0043] Step S2: Extraction of fibrous lignin component

[0044] Soaking extraction: Put the crushed Chinese medicine residues into acetone solution, soak at 50 °C for 3 hours according to the solid-liquid ratio of 1:10, and continuously stir to promote the dissolution of fibrous lignin components.

[0045] Filtration and drying: Filter through a vacuum filtration device, collect the filtrate, rinse the filter residue with acetone again, and then dry the fibrous lignin component at 50 °C to constant weight.

[0046] Step S3: Polymerization reaction

[0047] Mixing reaction: In a reaction kettle, add the fibrous lignin component (10 g), acrylic monomer (20 g), divinylbenzene (0.5 g) and potassium persulfate (0.2 g) to 200 ml of deionized water, and stir well until uniformly dissolved.

[0048] Step S4: Extraction of aroma components

[0049] Adopt distillation technology: The operating temperature is 100 °C, and extract the aroma components by steam distillation.

[0050] Preparation of essential oil: The extracted aroma components are purified by vacuum distillation to obtain high-concentration Chinese herbal medicine essential oil.

[0051] Step S5: Resin compounding

[0052] Essential oil compounding: The superabsorbent resin and the purified essential oil are mixed at a mass ratio of 1:0.15, and the essential oil is evenly distributed in the resin by the impregnation method.

[0053] Molding process: The composite resin is made into sheet products, which are suitable for indoor dehumidification and air purification applications.

[0054] Summary of the example: This example uses acetone as a solvent to extract fiber lignin components and adopts supercritical CO2 technology to extract aroma components. The finally prepared resin not only has strong water absorption, but also shows excellent performance in air purification and dehumidification, and has a good aroma diffusion effect.

[0055] Comparative example 1 Preparation of multifunctional superabsorbent resin based on Chinese herbal medicine residues

[0056] Step S1: Pretreatment

[0057] Drying of Chinese herbal medicine residues: Dry at 90 °C for 4 hours to remove moisture and impurities to ensure the effect of subsequent treatment.

[0058] Crushing: Use a knife mill to crush the dried Chinese herbal medicine residues into particles with a particle size of 0.3 mm to increase the specific surface area.

[0059] Step S2: Extraction of fiber lignin components

[0060] Extraction with mixed solvent: Put the crushed Chinese herbal medicine residues into a mixed solvent of ethanol and acetone (1:1), soak at a solid-liquid ratio of 1:10 at 60 °C for 2 hours, and stir continuously to promote the dissolution of fiber lignin components.

[0061] Filtration and drying: Filter through a filtration device, collect the filtrate, rinse the filter residue with the mixed solvent again, and then dry the fiber lignin components at 50 °C to constant weight.

[0062] Step S3: Polymerization reaction

[0063] Mixing reaction: In a reactor, add the fiber lignin components (8 g), acrylic acid monomer (15 g), divinylbenzene (0.3 g) and potassium persulfate (0.15 g) to 150 ml of deionized water, and stir well until evenly dissolved.

[0064] Step S4: Extraction of aroma components

[0065] Distillation extraction: Place the Chinese medicine residue into a distillation device at an operating temperature of 100°C and extract the aroma components through steam distillation.

[0066] Essential oil preparation: The aroma components extracted by distillation are purified by vacuum distillation to obtain high-concentration Chinese herbal essential oils.

[0067] Step S5: Resin compounding

[0068] Essential oil compounding: Mix the highly absorbent resin with the purified essential oil in a mass ratio of 1:0.2, and evenly cover the resin surface by spraying to give it a lasting aroma diffusion function.

[0069] Molding process: The composite resin is made into block products, which are suitable for large-area environmental dehumidification and air purification.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0071] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for preparing a multifunctional water-absorbent resin based on traditional Chinese medicine residue components, characterized in that: The preparation method comprises the following steps: S1, washing, drying, crushing and sieving the Chinese medicine residue to obtain Chinese medicine residue powder; S2, soaking the Chinese medicine residue powder in NaOH solution; then heating in a water bath and adding 15% NaOH solution, stirring and mixing to perform an alkalization reaction to obtain an alkalized solution; S3, heating the alkalized solution, then quickly dropping a sodium chloroacetate aqueous solution into it to perform an etherification reaction to obtain an etherified solution, and then drying the etherified solution to extract the fiber wood components in the medicinal residue; S4, mixing the fiber wood component, acrylic monomer, crosslinking agent and initiator to perform polymerization reaction to generate a highly water-absorbent resin having a hydrophilic group; S5, extracting aroma components from the Chinese medicine residues to make essential oil for later use; S6. Compounding the essential oil with a highly absorbent resin to prepare a multifunctional absorbent resin based on components of traditional Chinese medicine residues.

2. The method for preparing a multifunctional water-absorbent resin based on traditional Chinese medicine residue components according to claim 1, characterized in that: The Chinese medicinal residue powder after being crushed in step S1 needs to pass through 40 mesh.

3. The method for preparing a multifunctional water-absorbent resin based on traditional Chinese medicine residue components according to claim 1, characterized in that: The concentration of the NaOH solution used for soaking in step S2 is 0.15 mol / L; the temperature of the water bath heating is 30-40° C.; and the alkalization reaction time is 2-3 h.

4. The method for preparing a multifunctional water-absorbent resin based on traditional Chinese medicine residue components according to claim 1, characterized in that: The temperature of heating the alkalized solution in step S3 is 65-75° C.; the concentration of the sodium chloroacetate aqueous solution is 0.19 mol / L; the dropping speed of the sodium chloroacetate aqueous solution is 10-15 drops / second; and the etherification reaction time is 2-3 hours.

5. The method for preparing a multifunctional water-absorbent resin based on traditional Chinese medicine residue components according to claim 1, characterized in that: In step S4, the mass ratio of the fiber wood component, the acrylic monomer, the crosslinking agent and the initiator is 1:9:0.0015:0.

25.

6. The method for preparing a multifunctional water-absorbent resin based on traditional Chinese medicine residue components according to claim 1, characterized in that: The cross-linking agent is N,N'-methylenebisacrylamide solution; the initiator is K2S2O8.

7. The method for preparing a multifunctional water-absorbent resin based on traditional Chinese medicine residue components according to claim 1, characterized in that: The specific preparation steps of the essential oil in step S5 are: firstly adopting distillation technology to extract the aroma components in the Chinese medicine residue by steam distillation; the temperature during distillation is 100° C.; and then purifying the extracted aroma components by vacuum distillation to obtain a high-concentration Chinese medicine essential oil.

8. The method for preparing a multifunctional water-absorbent resin based on traditional Chinese medicine residue components according to claim 1, characterized in that: The specific operation steps of step S6 are: mixing the highly absorbent resin and the purified Chinese herbal essential oil in a mass ratio of 1:0.15, and evenly distributing the Chinese herbal essential oil in the highly absorbent resin by an impregnation method.

9. A multifunctional water-absorbent resin based on Chinese medicine residue components is prepared by the preparation method of a multifunctional water-absorbent resin based on Chinese medicine residue components according to any one of claims 1 to 8.

10. The multifunctional water-absorbent resin based on traditional Chinese medicine residues as claimed in claim 9 is used as a substrate for preparing an air purification device.

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