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CN-121992680-A - Pulp molding slurry, pulp molded product and preparation method thereof

CN121992680ACN 121992680 ACN121992680 ACN 121992680ACN-121992680-A

Abstract

The application provides pulp for pulp molding, a pulp molding product and a preparation method thereof, and relates to the technical field of pulp molding. The pulp molding slurry comprises activated coffee grounds and fiber pulp, wherein the activated coffee grounds are obtained by degreasing, pyrolyzing and activating with alkali solution of coffee grounds raw materials, and the mass percentage of the activated coffee grounds is 100%, and the activated coffee grounds comprise 5% -10% of first coffee grounds with the particle size of more than 150 mu m, 80% -90% of second coffee grounds with the particle size of 75-150 mu m and 5% -10% of third coffee grounds with the particle size of less than 75 mu m. The pulp molding slurry and the pulp molding product realize the recycling of the solid waste of the coffee grounds, simultaneously endow the product with natural color development, original textures and good buffering performance, do not need to add synthetic dye or use complex dies, and have the environmental protection, aesthetic value and practical performance.

Inventors

  • LI MENGXIAO
  • CHANG GUI
  • CHEN CHENG
  • Ruan Renzhi

Assignees

  • 联宝(合肥)电子科技有限公司

Dates

Publication Date
20260508
Application Date
20260324

Claims (10)

  1. 1. A pulp molding slurry, characterized in that the pulp molding slurry comprises activated coffee grounds and fiber pulp, wherein, The activated coffee grounds are obtained by degreasing, pyrolyzing and activating the coffee grounds raw materials with alkali solution, Taking the mass percentage of the activated coffee grounds as 100 percent, the activated coffee grounds comprise: 5% -10% of first coffee grounds with particle diameters larger than 150 mu m; 80% -90% of second coffee grounds with particle diameters of 75-150 mu m; and 5% -10% of third coffee grounds with particle diameters smaller than 75 microns.
  2. 2. The pulp molding slurry according to claim 1, wherein, The pulp molding slurry comprises, by mass, 100% of the pulp molding slurry: 5% -10% of activated coffee grounds; 40% -45% of first fiber pulp; And 40% -45% of second fiber pulp, wherein the fiber length of the first fiber pulp is greater than the fiber length of the second fiber pulp.
  3. 3. The pulp molding slurry according to claim 2, wherein, The first fiber pulp comprises at least one of needle wood pulp and hemp pulp; the second fiber pulp comprises at least one of hardwood pulp, bamboo pulp and sugarcane pulp.
  4. 4. The pulp molding slurry according to claim 1, wherein, The coffee grounds raw materials include: Shallow-roasted coffee grounds having a roasting temperature of 150-180 ℃, and/or, And deep-dried coffee grounds with a baking temperature of 220-280 ℃.
  5. 5. The pulp molding slurry according to claim 1 or 2, further comprising an in-situ color development regulator; the in-situ color development regulator comprises the following components in percentage by mass as 100% of the pulp molding slurry: 1-3% of calcium carbonate or 0.1-0.3% of ferric sulfate.
  6. 6. The pulp molding slurry according to claim 1, wherein, The porosity of the activated coffee grounds is 50-60%, and the specific surface area is 500-600 m 2 /g.
  7. 7. The pulp molding slurry according to claim 1, wherein the activated coffee grounds are prepared by a process comprising: extracting the coffee grounds raw materials by using an alcohol solution, and degreasing the coffee grounds raw materials to obtain pretreated coffee grounds; Pyrolyzing the pretreated coffee grounds in a vacuum environment at 290-310 ℃ to form microporous coffee grounds; and activating the microporous coffee grounds by using an alkaline solution at 230-260 ℃ to obtain the activated coffee grounds, wherein the mass ratio of the microporous coffee grounds to the alkaline solution is 1:1-2.
  8. 8. A method of making a pulp molded article, the method comprising: molding the pulp molding slurry according to any one of claims 1 to 7 by a vacuum molding method to obtain a wet blank; and drying and hot-pressing the wet blank to obtain the pulp molding product.
  9. 9. The method according to claim 8, wherein, The drying mode is gradient drying, and the gradient drying comprises the following steps: Drying for 20-30 minutes at 30-50 ℃ until the moisture content of the wet blank is reduced to 40-50%; Drying at 60-80 ℃ for 10-20 minutes until the moisture content of the wet blank is reduced to 10-15%; drying at 30-40 ℃ until the wet blank is absolute dry; the temperature of the hot pressing treatment is 120-150 ℃, the pressure is 3-5 MPa, and the time is 3-5 min.
  10. 10. A pulp molding product is characterized by comprising a fiber raw material and activated coffee grounds, wherein the activated coffee grounds are obtained by degreasing, pyrolyzing and activating the coffee grounds raw material with alkali solution, Taking the mass percentage of the activated coffee grounds as 100 percent, the activated coffee grounds comprise: 5% -10% of first coffee grounds with particle diameters larger than 150 mu m; 80% -90% of second coffee grounds with particle diameters of 75-150 mu m; and 5% -10% of third coffee grounds with particle diameters smaller than 75 microns.

Description

Pulp molding slurry, pulp molded product and preparation method thereof Technical Field The application relates to the technical field of pulp molding, in particular to pulp molding slurry, a pulp molding product and a preparation method thereof. Background The pulp molding products are widely applied in the packaging field by virtue of the advantages of degradability, environmental protection and the like. However, there are still many technical problems to be solved in terms of appearance characteristics and material properties of the current pulp molding products, which limit further popularization and application. The color of the paper pulp molding product at present is dependent on synthetic dye, especially fluorine-containing oil-proof agent, heavy metal dye and the like, so that the degradation risk is increased, the environment-friendly requirement is not met, the surface texture of the product is generally realized by depending on embossing of a die or surface post-treatment, the cost of the die is high, the process is complex, the mechanical feel of the formed texture is strong, the natural original ecological texture is lacking, in addition, the buffering protection performance of the paper pulp molding product is mainly dependent on the geometric structure design of the product, the development cost of the die is increased, the energy absorption efficiency of a fiber substrate used by the traditional product is limited, and the packaging buffering requirement of fragile and high-precision products is difficult to meet. Disclosure of Invention Accordingly, it is a primary object of the present application to provide a pulp molding slurry, a pulp molded product and a method for preparing the same, which aim to at least partially solve at least one of the above-mentioned technical problems. In order to achieve the above purpose, the technical scheme of the application is as follows: in one aspect of the present application, there is provided a pulp molding slurry comprising activated coffee grounds and fiber pulp, wherein the activated coffee grounds are obtained by degreasing, pyrolyzing, and activating with an alkali solution a coffee grounds raw material; the mass percentage of the activated coffee grounds is 100%, and the activated coffee grounds comprise 5% -10% of first coffee grounds with the particle size larger than 150 mu m, 80% -90% of second coffee grounds with the particle size of 75-150 mu m and 5% -10% of third coffee grounds with the particle size smaller than 75 mu m. In some embodiments, the pulp molding slurry comprises 5% -10% of activated coffee grounds, 40% -45% of first fiber pulp and 40% -45% of second fiber pulp, wherein the fiber length of the first fiber pulp is greater than the fiber length of the second fiber pulp, and the mass percentage of the pulp molding slurry is 100%. In some embodiments, the first fiber pulp comprises at least one of softwood pulp and hemp pulp, and the second fiber pulp comprises at least one of hardwood pulp, bamboo pulp and sugarcane pulp. In some embodiments, the coffee grounds material includes shallow roasted coffee grounds having a roasting temperature of 150-180 ℃ and/or deep roasted coffee grounds having a roasting temperature of 220-280 ℃. In some embodiments, the pulp molding slurry further comprises an in-situ color development regulator, wherein the in-situ color development regulator comprises 1-3% of calcium carbonate or 0.1-0.3% of ferric sulfate by weight percent of the pulp molding slurry being 100%. In some embodiments, the activated coffee grounds have a porosity of 50-60% and a specific surface area of 500-600 m 2/g. In some embodiments, a method of preparing activated coffee grounds includes: Extracting a coffee grounds raw material by using an alcohol solution, degreasing the coffee grounds raw material to obtain pretreated coffee grounds; pyrolyzing the pretreated coffee grounds in a vacuum environment at 290-310 ℃ to form microporous coffee grounds; and activating the microporous coffee grounds by using an alkaline solution at 230-260 ℃ to obtain activated coffee grounds, wherein the mass ratio of the microporous coffee grounds to the alkaline solution is 1:1-2. In one aspect of the present application, there is provided a method of making a pulp molded article comprising: molding the pulp molding slurry by a vacuum molding method to obtain a wet blank; and drying and hot-pressing the wet blank to obtain the pulp molding product. In some embodiments, the drying is by gradient drying, the gradient drying comprising: drying at 30-50 ℃ for 20-30 minutes until the water content of the semi-finished product is reduced to 40-50%; Drying at 60-80 ℃ for 10-20 minutes until the water content of the semi-finished product is reduced to 10-15%; Drying at 30-40 ℃ until the semi-finished product is absolute dry; In some embodiments, the autoclave is at a temperature of 120-150 ℃, a pressure of 3-5 mpa, and a time of 3-5 minutes. In on