Coffee residue deodorizing and decontaminating material and preparation method thereof

Abstract

The invention relates to a coffee residue deodorizing and decontaminating material and a preparation method thereof. The preparation method of the material comprises the following steps: arranging a fiber aggregate consisting of nanoscale functional fibers (200 nanometers to 1 micrometer) loaded with coffee grounds and micron-sized structural fibers (5 micrometers to 20 micrometers) to form the deodorizing and decontaminating material containing coffee grounds. According to the invention, the coffee residue nanofibers provide deodorization and decontamination functions, and the micron-sized fibers provide more dirt holding space and have higher strength, so that the coffee residue fibers can be effectively protected, the efficacy utilization rate of coffee residues is improved, and the service life of the coffee residues is effectively prolonged; according to the deodorizing and decontaminating material, the proportion of the functional fibers to the structural fibers can be adjusted according to expected cost and use occasions so as to meet different application requirements. The method is high in production efficiency, short in process and convenient to operate, efficient utilization of the coffee grounds is achieved, materials are degradable and environmentally friendly, and the method can be applied to packaging, wiping cloth, facial masks, hygienic materials and the like.

Description

Technical Field

[0001] The invention relates to the technical field of functional materials, and in particular to a coffee grounds deodorizing and decontamination material and a preparation method thereof. Background Art

[0002] Coffee is one of the most popular drinks in the world. According to statistics from the International Coffee Organization (ICO), about 8 million tons of coffee grounds are produced each year. However, coffee grounds cannot be directly landfilled or incinerated. Coffee grounds contain a high content of organic matter (about 50% cellulose and hemicellulose, about 20% lignin and protein). Direct landfilling will produce a large amount of methane, a greenhouse gas that is 25-86 times more harmful to the environment than carbon dioxide. The global emission of coffee waste is equivalent to the emission of 10 million cars per year. In addition, there are minerals, caffeine, tannins and phenolic compounds in coffee grounds, and their incineration process will produce a large amount of carbon dioxide and other harmful substances. However, most of the coffee grounds on the market still cannot escape the fate of garbage incineration and landfill, which is related to the very limited ways to make money from coffee grounds. The true value of coffee grounds has not been effectively utilized. Therefore, recycling coffee grounds is of great significance to saving resources and protecting the environment.

[0003] Travel cups, notebooks, tables, chairs, and other daily necessities made from recycled and environmentally friendly materials from coffee grounds (the content of coffee grounds exceeds 30%). In addition, coffee grounds contain nitrogen compounds (1.4-1.56%), phosphides (2.6-3.7%), and potassium (0.32-0.37%), which are similar to the composition of organic fertilizers. Therefore, researchers' recycling of coffee grounds is mostly focused on composting, producing animal feed, and biogas. In addition, coffee grounds are used to produce coffee oil as a biofuel, and as natural fillers for the production of plastics, chemical fibers, cat litter, etc. Although these methods can recycle waste coffee grounds, they are costly or underutilized, and with the annual increase in the amount of unused coffee grounds, it is necessary to develop new methods for utilizing coffee grounds.

[0004] Due to the effect of baking, coffee grounds have a porous nanostructure and a large specific surface area, and have great application value in adsorbing debris, inhibiting bacteria, deodorizing, and dehumidifying. CN110523390A discloses a hydrophobic coffee grounds adsorbent and a preparation method thereof. This technology modifies the coffee grounds to extend their service life and absorption efficiency. CN114345112A discloses a deodorant and a preparation method thereof. This technology mixes coffee grounds with other materials to prepare a deodorant with a long-lasting deodorizing function. Although these technical solutions have good effects, they have a single function and cannot fully utilize the multiple functions of coffee grounds; at the same time, the granular materials often cluster and compact as the use time increases, and are prone to clogging the surface pores after adsorption, resulting in the inability to fully utilize the interior, causing waste.

[0005] In view of this, it is of great significance to develop a functional material of coffee grounds that can fully utilize the multiple functions of coffee grounds, improve their utilization rate, increase their usage methods and can be quickly degraded. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a coffee grounds deodorizing and decontamination material and a preparation method thereof. The present invention well solves the problems of the prior art of single utilization function, low utilization rate and single use of coffee grounds.

[0007] To achieve the above object, the solution of the present invention is: A coffee grounds deodorizing and decontamination material and a preparation method thereof, the coffee grounds deodorizing and decontamination material comprising: a fiber assembly, the fiber assembly consisting of staggered functional fibers and structural fibers; Preferably, the functional fiber is a nano-scale fiber loaded with coffee grounds, and the coffee grounds material includes: coffee grounds, coffee grounds carbonized, modified coffee grounds, etc.; Preferably, the functional fiber raw material loaded with coffee grounds includes: one or a combination of two or more of starch, cellulose and its derivatives, regenerated silk fibroin and PBAT, etc., and the fiber diameter thereof is 200 to 1000 nanometers; Preferably, the amount of coffee grounds in the functional fiber is 1 to 15 parts, and the amount of functional fiber raw material is 85 to 99 parts; Preferably, the structural fiber is a micron-grade fiber with a fiber diameter of 10 to 20 microns, and the raw material is polylactic acid with a molecular weight of 80,000 to 200,000; Preferably, the deodorizing and decontamination material has a gram weight of 1 gram per square meter to 100 grams per square meter and a thickness of 0.01 mm to 0.5 mm; Preferably, the deodorizing and decontamination material has a breaking strength of 1 MPa to 10 MPa; Preferably, the method for preparing the deodorizing and decontamination material comprises the following steps: Step 1: Mix coffee grounds into spinning solution A containing functional fiber raw materials, and stir evenly at room temperature to form spinning solution A containing coffee grounds, wherein the solute accounts for 10% to 30% of the spinning solution A; Step 2: Select a solvent to dissolve the polylactic acid particles and stir evenly at room temperature to form a spinning solution B, in which the solute accounts for 8% to 14%; Step 3: Add spinning solution A and spinning solution B into two sealed chambers of the centrifugal chamber spinneret respectively, turn on the motor, and the nanofibers loaded with coffee grounds and polylactic acid microfibers are respectively thrown out from the two spinneret holes and fall on the collecting curtain. Spin continuously for 10 minutes to 10 hours to obtain the deodorizing and decontamination material.

[0008] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention uses nanofibers to load coffee grounds, and utilizes the large specific surface area and large spreading area of ​​the nanofiber membrane and the spacing effect of the micron fibers to achieve full contact between the coffee grounds and the air, which helps to improve the deodorization efficiency and utilization rate; (2) The micron-sized fibers of the present invention can not only provide higher strength to effectively protect the coffee grounds fibers, but also their staggered distribution structure can provide more dirt-receiving space, making it more convenient and economical to clean oil stains; (3) The coffee grounds deodorizing and decontamination material of the present invention can be used as a variety of functional materials such as deodorizing materials, wiping materials, packaging materials and sanitary materials, thereby realizing the diversified utilization of coffee grounds; (4) The coffee grounds deodorizing and decontamination material of the present invention can continue to be used as a fertilizer after use, and the fiber-loaded coffee grounds can achieve rapid degradation, thereby reducing the environmental carrying pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a 100x electron microscope image of the coffee grounds deodorizing and decontamination material; Figure 2 This is a 500x electron microscope image of the coffee grounds deodorizing and decontamination material; Figure 3 Diagram of the preparation process of deodorizing and cleaning materials for coffee grounds. DETAILED DESCRIPTION

[0010] The present invention is further described below in conjunction with specific embodiments. It should be noted that these examples are only used to illustrate the present invention, so that those skilled in the art can further understand the technical concept and features of the present invention, but are not used to limit the scope of the present invention. It should be noted that for those skilled in the art, various changes or modifications are made to the present invention without departing from the concept of the present invention, and these equivalent forms also belong to the scope defined by the claims attached to the present invention.

[0011] Embodiment 1: refer to Figure 3. Mix 1 part of coffee grounds and 99 parts of starch into a sodium hydroxide aqueous solution, stir evenly at room temperature to form a spinning solution A containing coffee grounds, with a solute concentration of 10%; add polylactic acid particles with a molecular weight of 80,000 to a dichloromethane solution, stir evenly at room temperature to form a polylactic acid spinning solution B with a concentration of 8%; add the coffee grounds / starch spinning solution (A) and the polylactic acid spinning solution (B) into two sealed chambers of a centrifugal split-chamber spinneret, respectively; turn on the motor at a speed of 3000 rpm and spin for 10 minutes to obtain a coffee ground deodorizing and decontamination material; the diameter of the coffee ground functional fiber in the material is 800 nanometers, the diameter of the polylactic acid fiber is 5 microns, the gram weight is 1 gram per square meter, the thickness is 0.01 mm, and the breaking strength is 1 MPa. See the 100x electron microscope image of the coffee ground deodorizing and decontamination material. Figure 1 ; 500 times electron microscope image of coffee grounds deodorizing and decontamination material Figure 2 .

[0012] Embodiment 2: refer to Figure 3 . Mix 5 parts of coffee grounds and 95 parts of ethyl cellulose into an ethanol / water mixed solution, stir evenly at room temperature to form a spinning solution A containing coffee grounds, with a solute concentration of 15%; add polylactic acid particles with a molecular weight of 100,000 to a dichloromethane solution, stir evenly at room temperature to form a polylactic acid spinning solution B with a concentration of 10%; add the coffee grounds / ethyl cellulose spinning solution (A) and the polylactic acid spinning solution (B) into two sealed chambers of a centrifugal split-chamber spinneret respectively; turn on the motor at a speed of 2000 rpm and spin for 1 hour to obtain a coffee ground deodorizing and decontamination material; the diameter of the coffee ground functional fiber in the material is 900 nanometers, the diameter of the polylactic acid fiber is 10 microns, the gram weight is 5 grams per square meter, the thickness is 0.1 mm, and the breaking strength is 5 MPa. See the 100x electron microscope image of the coffee ground deodorizing and decontamination material. Figure 1 ; 500 times electron microscope image of coffee grounds deodorizing and decontamination material Figure 2 .

[0013] Embodiment 3: refer to Figure 3. 15 parts of coffee grounds, 45 parts of regenerated silk fibroin and 45 parts of ethyl cellulose are mixed into a formic acid / ethanol mixed solution, and stirred evenly at room temperature to form a spinning solution A containing coffee grounds, with a solute concentration of 22%; polylactic acid particles with a molecular weight of 150,000 are added to a dichloromethane solution, and stirred evenly at room temperature to form a polylactic acid spinning solution B with a concentration of 12%; the coffee grounds / silk fibroin / ethyl cellulose spinning solution (A) and the polylactic acid spinning solution (B) are respectively added into the two sealed chambers of the centrifugal chamber spinneret; the motor is turned on at a speed of 1500 rpm and spun for 2 hours to obtain a coffee ground deodorizing and decontamination material; the diameter of the coffee ground functional fiber in the material is 1000 nanometers, the diameter of the polylactic acid fiber is 12 microns, the gram weight is 15 grams per square meter, the thickness is 0.2 mm, and the breaking strength is 6 MPa. 100x electron microscope image of the coffee ground deodorizing and decontamination material is shown in Figure 1 ; 500 times electron microscope image of coffee grounds deodorizing and decontamination material Figure 2 .

[0014] Embodiment 4: refer to Figure 3 . Mix 2 parts of coffee grounds and 98 parts of PBAT into DMF solution, stir evenly at room temperature to form spinning solution A containing coffee grounds, with a solute concentration of 30%; add polylactic acid particles with a molecular weight of 200,000 into dichloromethane solution, stir evenly at room temperature to form polylactic acid spinning solution B with a concentration of 14%; add coffee grounds / PBAT spinning solution (A) and polylactic acid spinning solution (B) into two sealed chambers of a centrifugal spinneret respectively; turn on the motor at a speed of 2500 rpm and spin for 10 hours to obtain a coffee ground deodorizing and decontamination material; the diameter of the coffee ground functional fiber in the material is 200 nanometers, the diameter of the polylactic acid fiber is 20 microns, the gram weight is 100 grams per square meter, the thickness is 0.5 mm, and the breaking strength is 10 MPa. See the 100x electron microscope image of the coffee ground deodorizing and decontamination material. Figure 1 ; 500 times electron microscope image of coffee grounds deodorizing and decontamination material Figure 2 .

[0015] Embodiment 5: refer to Figure 3. 10 parts of coffee grounds carbonization, 50 parts of starch and 40 parts of hydroxypropyl methylcellulose are mixed into a sodium hydroxide aqueous solution, and stirred at room temperature to form a spinning solution A containing coffee grounds carbonization, with a solute concentration of 15%; polylactic acid particles with a molecular weight of 80,000 are added to a dichloromethane solution, and stirred at room temperature to form a polylactic acid spinning solution B with a concentration of 11%; the coffee grounds carbonization / starch / hydroxypropyl methylcellulose spinning solution (A) and the polylactic acid spinning solution (B) are respectively added into two sealed chambers of a centrifugal split-chamber spinneret; the motor is turned on at a speed of 2000 rpm and spun for 30 minutes to obtain a coffee grounds deodorizing and decontamination material; the diameter of the coffee grounds carbonization functional fiber in the material is 600 nanometers, the diameter of the polylactic acid fiber is 10 microns, the gram weight is 4 grams per square meter, the thickness is 0.05 mm, and the breaking strength is 7 MPa. The 100x electron microscope image of the coffee grounds deodorizing and decontamination material is shown in Figure 1 ; 500 times electron microscope image of coffee grounds deodorizing and decontamination material Figure 2 .

[0016] Embodiment 6: refer to Figure 3 . 10 parts of modified coffee grounds, 10 parts of regenerated silk fibroin and 80 parts of ethyl cellulose were mixed into an ethanol / water mixed solution, and stirred evenly at room temperature to form a spinning solution A containing modified coffee grounds, with a solute concentration of 24%; polylactic acid particles with a molecular weight of 100,000 were added to a dichloromethane solution, and stirred evenly at room temperature to form a polylactic acid spinning solution B with a concentration of 12%; the modified coffee grounds / regenerated silk fibroin / ethyl cellulose spinning solution (A) and the polylactic acid spinning solution (B) were added into two sealed chambers of a centrifugal split-chamber spinneret respectively; the motor was turned on at a speed of 3000 rpm and spun for 6 hours to obtain a coffee ground deodorizing and decontamination material; the diameter of the coffee grounds carbonized functional fiber in the material was 900 nanometers, the diameter of the polylactic acid fiber was 16 microns, the gram weight was 50 grams per square meter, the thickness was 0.4 mm, and the breaking strength was 8 MPa. The 100x electron microscope image of the coffee grounds deodorizing and decontamination material is shown in Figure 1 ; 500 times electron microscope image of coffee grounds deodorizing and decontamination material Figure 2 .

Claims

1. A coffee ground deodorizing and decontamination material, characterized in that: The coffee grounds deodorizing and decontamination material includes: a fiber assembly, which is composed of functional fibers and structural fibers arranged in an interlaced manner; the functional fibers are nano-scale fibers loaded with coffee grounds, and the coffee grounds materials include: coffee grounds, coffee grounds carbonized, modified coffee grounds, etc.; the functional fiber raw materials loaded with coffee grounds include: one or a combination of two or more of starch, cellulose and its derivatives, regenerated silk fibroin and PBAT, etc., and the fiber diameter thereof is 200 nanometers to 1000 nanometers; the proportion of coffee grounds in the functional fibers is 1 to 15 parts, and the proportion of functional fiber raw materials is 85 to 99 parts; the structural fibers are micron-scale fibers, with a fiber diameter of 5 to 20 micrometers, and the raw material is polylactic acid with a molecular weight of 80,000 to 200,000.

2. The coffee grounds deodorizing and decontamination material according to claim 1, characterized in that: The deodorizing and decontamination removing material has a gram weight of 1 gram per square meter to 100 grams per square meter and a thickness of 0.01 millimeters to 0.5 millimeters.

3. The coffee grounds deodorizing and decontamination material according to claim 1, characterized in that: The deodorizing and decontamination removing material has a breaking strength of 1 MPa to 10 MPa.

4. A method for preparing the coffee grounds deodorizing and decontamination material according to any one of claims 1 to 3, comprising the following steps: Step 1: Mix coffee grounds into spinning solution A containing functional fiber raw materials, and stir evenly at room temperature to form spinning solution A containing coffee grounds, wherein the solute accounts for 10% to 30% of the spinning solution A; Step 2: Use an appropriate solvent to dissolve the polylactic acid particles, and stir evenly at room temperature to form a spinning solution B, in which the solute accounts for 8% to 14%; Step 3: Add spinning solution A and spinning solution B into two sealed chambers of the centrifugal chamber spinneret respectively, turn on the motor, and the nanofibers loaded with coffee grounds and polylactic acid microfibers are respectively thrown out from the two spinneret holes and fall on the collecting curtain. Spin continuously for 10 minutes to 10 hours to obtain the deodorizing and decontamination material.

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