Preparation and construction method of micro-cement composite material based on coffee residue modification

Abstract

The invention discloses a preparation and construction method of a micro-cement composite material based on coffee residue modification, and belongs to the technical field of building materials. The micro-cement composite material based on coffee residue modification comprises a component A and a component B, and the component A and the component B are matched according to the weight ratio of 4: 1; the component A is prepared from the following raw materials in parts by weight: 15 parts of coffee residue modified filler, 30 parts of a cement-based cementing material, 10 parts of 20-40-mesh quartz sand, 15 parts of 40-80-mesh quartz sand, 20 parts of 80-120-mesh quartz sand, 10 parts of 400-mesh heavy calcium carbonate powder, 0.2 part of a polycarboxylic acid water reducing agent, 0.2 part of a dry powder defoaming agent and 0.1 part of polypropylene fiber; the component B is water-based resin emulsion and comprises epoxy resin or acrylic resin; the carbon footprint of the material can be reduced; the device is suitable for humid environment; natural granular sensation and pigments form unique textures, artificial pigment addition is reduced, and the decoration effect is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of building materials, and particularly relates to a microcement composite material with coffee grounds as a functional filler, which is applicable to building decoration, home design, and industrial surface coatings. Background Art

[0002] Status of microcement: Traditional microcement is composed of cement, resin, mineral fillers, and additives, and has high strength, waterproofness, and decorative properties. However, it has the following problems: relying on non-renewable mineral fillers (such as quartz sand); high carbon emissions during the production process; single decorative effect and lack of ecological attributes.

[0003] Approximately 6 million tons of coffee grounds are generated globally every year, and most of them are landfilled or incinerated, causing waste of resources and environmental pollution. Coffee grounds contain a porous structure, organic matter, and natural pigments, and have the potential for moisture absorption, antibacterial, and decorative properties, but have not been effectively applied in building materials.

[0004] Based on the above, this case specifically proposes a microcement composite material with coffee grounds as a functional filler. Summary of the Invention

[0005] The purpose of the present invention is to provide a preparation and construction method of a microcement composite material modified based on coffee grounds, which can reduce the usage amount of non-renewable mineral fillers and artificial pigments, save energy and protect the environment, and have good decorative effects.

[0006] The technical solution of the present invention is as follows: The microcement composite material modified based on coffee grounds includes two components, A and B, and the components A and B are proportioned according to a weight ratio of 4:1; Among them, component A includes, by weight parts: 15 parts of coffee grounds modified filler, 30 parts of cement-based gelling material, 10 parts of 20-40 mesh quartz sand, 15 parts of 40-80 mesh quartz sand, 20 parts of 80-120 mesh quartz sand, 10 parts of 400 mesh heavy calcium powder, 0.2 part of polycarboxylate water reducer, 0.2 part of dry powder defoamer, and 0.1 part of polypropylene fiber; Component B is an aqueous resin emulsion, including epoxy resin or acrylic resin.

[0007] Further, the cement-based gelling material is selected as 425 Portland white cement.

[0008] Preferably, component A includes, by weight parts: 10 parts of coffee grounds modified filler, 25 parts of cement-based gelling material, 5 parts of 20-40 mesh quartz sand, 10 parts of 40-80 mesh quartz sand, 15 parts of 80-120 mesh quartz sand, 10 parts of 400 mesh heavy calcium powder, 0.1 part of polycarboxylate water reducer, 0.1 part of dry powder defoamer, and 0.1 part of polypropylene fiber.

[0009] Preferably, component A includes, by weight parts: 23 parts of coffee residue modified filler, 35 parts of cement-based cementitious material, 10 parts of 20-40 mesh quartz sand, 18 parts of 40-80 mesh quartz sand, 23 parts of 80-120 mesh quartz sand, 18 parts of 400 mesh heavy calcium powder, 0.35 parts of polycarboxylate water reducer, 0.2 parts of dry powder defoamer, and 0.2 parts of polypropylene fiber.

[0010] Preferably, component A includes, by weight parts: 25 parts of coffee residue modified filler, 45 parts of cement-based cementitious material, 15 parts of 20-40 mesh quartz sand, 25 parts of 40-80 mesh quartz sand, 30 parts of 80-120 mesh quartz sand, 25 parts of 400 mesh heavy calcium powder, 0.6 parts of polycarboxylate water reducer, 0.3 parts of dry powder defoamer, and 0.3 parts of polypropylene fiber.

[0011] The microcement composite material based on coffee residue modification, the preparation method of the coffee residue modified filler includes: Pretreatment: drying the coffee residue at 80-120 °C until the moisture content < 5%, and pulverizing it to 80-200 mesh; Carbonization treatment: calcining for 1-2 hours in an inert gas environment, and the calcination temperature is 300-500 °C to form porous carbonized coffee residue; Surface modification: coating the porous carbonized coffee residue with a silane coupling agent or nano-SiO2 to enhance its interfacial bonding force with the cement matrix.

[0012] The construction method of the microcement composite material based on coffee residue modification includes the following steps: Step 1: Estimate the dosage of component A according to the construction site, configure component A according to the estimated dosage, and stir it with a dry powder mortar mixer for 35 minutes and then fill it; Step 2: Add resin emulsion of component B according to the estimated dosage of component A in proportion, and stir at high speed for 5 minutes to form a homogeneous slurry; Step 3: Apply it to the surface of the substrate in 3-5 coats, with an interval of 8-12 hours between each coat, and cure at room temperature for 4-12 hours.

[0013] The present invention can bring the following beneficial effects: Using coffee residue modified filler instead of traditional filler can reduce the material carbon footprint; the coffee residue modified filler itself has a porous structure, which improves the moisture absorption and air permeability of the microcement and is suitable for humid environments; the natural granularity and pigment of the coffee residue modified filler form a unique texture, reducing the addition of artificial pigments and improving the decorative effect. Specific embodiments

[0014] The microcement composite material based on coffee residue modification includes two components A and B, and components A and B are proportioned according to a weight ratio of 4:1; Component A includes, by weight parts ratio: 15 parts of coffee residue modified filler, 30 parts of cement-based cementitious material, 10 parts of 20-40 mesh quartz sand, 15 parts of 40-80 mesh quartz sand, 20 parts of 80-120 mesh quartz sand, 10 parts of 400 mesh heavy calcium powder, 0.2 parts of polycarboxylate water reducer, 0.2 parts of dry powder defoamer, and 0.1 parts of polypropylene fiber; Component B is a water-based resin emulsion, including epoxy resin or acrylic resin.

[0015] Furthermore, the cement-based cementitious material is selected as 425 Portland white cement.

[0016] Preferably, Component A includes, by weight parts ratio: 10 parts of coffee residue modified filler, 25 parts of cement-based cementitious material, 5 parts of 20-40 mesh quartz sand, 10 parts of 40-80 mesh quartz sand, 15 parts of 80-120 mesh quartz sand, 10 parts of 400 mesh heavy calcium powder, 0.1 parts of polycarboxylate water reducer, 0.1 parts of dry powder defoamer, and 0.1 parts of polypropylene fiber.

[0017] Preferably, Component A includes, by weight parts ratio: 23 parts of coffee residue modified filler, 35 parts of cement-based cementitious material, 10 parts of 20-40 mesh quartz sand, 18 parts of 40-80 mesh quartz sand, 23 parts of 80-120 mesh quartz sand, 18 parts of 400 mesh heavy calcium powder, 0.35 parts of polycarboxylate water reducer, 0.2 parts of dry powder defoamer, and 0.2 parts of polypropylene fiber.

[0018] Preferably, Component A includes, by weight parts ratio: 25 parts of coffee residue modified filler, 45 parts of cement-based cementitious material, 15 parts of 20-40 mesh quartz sand, 25 parts of 40-80 mesh quartz sand, 30 parts of 80-120 mesh quartz sand, 25 parts of 400 mesh heavy calcium powder, 0.6 parts of polycarboxylate water reducer, 0.3 parts of dry powder defoamer, and 0.3 parts of polypropylene fiber.

[0019] For the microcement composite material based on coffee residue modification, the preparation method of the coffee residue modified filler includes Pretreatment: drying the coffee residue at 80-120 °C until the moisture content < 5%, and pulverizing it to 80-200 mesh; Carbonization treatment: calcining for 1-2 hours in an inert gas environment at a calcination temperature of 300-500 °C to form porous carbonized coffee residue; Surface modification: coating the porous carbonized coffee residue with a silane coupling agent or nano-SiO2 to improve its interfacial bonding force with the cement matrix.

[0020] For the microcement composite material based on coffee residue modification, it is characterized in that its construction method includes the following steps: Step 1: Estimate the amount of Component A based on the construction site, prepare Component A according to the estimated amount, and stir it with a dry powder mortar mixer for 35 minutes before filling; Step 2: Add Component B resin emulsion in proportion according to the estimated amount of Component A, and stir at high speed for 5 minutes to form a homogeneous slurry; Step 3: Apply it to the surface of the substrate in 3 - 5 coats, with an interval of 8 - 12 hours between each coat, and cure at room temperature for 4 - 12 hours.

[0021] Taking a certain construction site as an example, it is estimated that 20 kg of Component A is used. According to the weight ratio of Component A to Component B of 4:1, 5 kg of Component B needs to be added; Example 1: Prepare 20 kg of Component A according to the ratio of 10 parts of coffee - residue modified filler, 25 parts of cement - based cementitious material, 5 parts of 20 - 40 - mesh quartz sand, 10 parts of 40 - 80 - mesh quartz sand, 15 parts of 80 - 120 - mesh quartz sand, 10 parts of 400 - mesh heavy calcium powder, 0.1 part of polycarboxylate water - reducing agent, 0.1 part of dry - powder defoamer, and 0.1 part of polypropylene fiber. Stir it with a dry powder mortar mixer for 35 minutes before filling; Add 5 kg of Component B water - based resin emulsion and stir at high speed for 5 minutes to form a homogeneous slurry; Apply it to the surface of the substrate in 5 coats, with an interval of 12 hours between each coat, and cure the last coat at room temperature for 12 hours.

[0022] Example 2: Prepare 20 kg of Component A according to the ratio of 23 parts of coffee - residue modified filler, 35 parts of cement - based cementitious material, 10 parts of 20 - 40 - mesh quartz sand, 18 parts of 40 - 80 - mesh quartz sand, 23 parts of 80 - 120 - mesh quartz sand, 18 parts of 400 - mesh heavy calcium powder, 0.35 part of polycarboxylate water - reducing agent, 0.2 part of dry - powder defoamer, and 0.2 part of polypropylene fiber. Stir it with a dry powder mortar mixer for 35 minutes before filling; Add 5 kg of Component B water - based resin emulsion and stir at high speed for 5 minutes to form a homogeneous slurry; Apply it to the surface of the substrate in 5 coats, with an interval of 12 hours between each coat, and cure the last coat at room temperature for 12 hours.

[0023] Example 3: Prepare 20 kg of Component A according to the ratio of 25 parts of coffee - residue modified filler, 45 parts of cement - based cementitious material, 15 parts of 20 - 40 - mesh quartz sand, 25 parts of 40 - 80 - mesh quartz sand, 30 parts of 80 - 120 - mesh quartz sand, 25 parts of 400 - mesh heavy calcium powder, 0.6 part of polycarboxylate water - reducing agent, 0.3 part of dry - powder defoamer, and 0.3 part of polypropylene fiber. Stir it with a dry powder mortar mixer for 35 minutes before filling; Add 5 kg of Component B water - based resin emulsion and stir at high speed for 5 minutes to form a homogeneous slurry; Apply it to the substrate surface in 5 coats, with a 12-hour interval between each coat, and cure the last coat at room temperature for 12 hours.

[0024] Samples of Examples 1-3 were taken for analysis. In terms of strength, it is basically on a par with existing microcement decorative materials. In terms of sensory experience, since Examples 1-3 used modified coffee grounds containing natural pigments, it has a more textured feel compared to chemically synthesized artificial pigments, and the decorative effect has been improved. In addition, using modified coffee grounds containing natural pigments also has the advantages of energy conservation and environmental protection compared to chemically synthesized artificial pigments.

[0025] The microcement composite material based on coffee ground modification provided by the present invention has a wide range of application scenarios, including applications in indoor and outdoor walls, floors, ceilings, countertops, sculptures, etc. as building decorations; it can also be applied to home design, such as custom furniture, art ornaments, etc.; it can also be used in public facilities such as environmental protection-themed spaces like libraries, museums, cafes, exhibition halls, etc. Each ton of the microcement composite material product based on coffee ground modification consumes about 200 kg of coffee grounds and reduces 0.5 tons of CO2 emissions, meeting the requirements of circular economy and green building certification.

[0026] The above is only the preferred specific implementation manner of the present invention and is not a limitation to the present invention. Any equivalent replacement and modification made by any person skilled in the art without departing from the guidance of the present invention shall be regarded as falling within the protection scope of the present invention.

Claims

1. Microcement composite material based on coffee grounds modification, characterized in that It includes two components, namely Component A and Component B, and Component A and Component B are proportioned according to a weight ratio of 4:

1. Among them, Component A includes, by weight parts ratio: 10 - 25 parts of coffee residue modified filler, 25 - 45 parts of cement-based gelling material, 5 - 15 parts of 20 - 40 mesh quartz sand, 10 - 25 parts of 40 - 80 mesh quartz sand, 15 - 30 parts of 80 - 120 mesh quartz sand, 10 - 25 parts of 400 mesh heavy calcium powder, 0.1 - 0.6 parts of polycarboxylate water reducer, 0.1 - 0.3 parts of dry powder defoamer, and 0.1 - 0.3 parts of polypropylene fiber; Component B is an aqueous resin emulsion, including epoxy resin or acrylic resin.

2. The microcement composite material based on coffee grounds modification according to claim 1, characterized in that, The cement-based gelling material selected is 425 Portland white cement.

3. The microcement composite material based on coffee grounds modification according to claim 1, characterized in that, Component A includes, by weight parts ratio: 10 parts of coffee residue modified filler, 25 parts of cement-based gelling material, 5 parts of 20 - 40 mesh quartz sand, 10 parts of 40 - 80 mesh quartz sand, 15 parts of 80 - 120 mesh quartz sand, 10 parts of 400 mesh heavy calcium powder, 0.1 parts of polycarboxylate water reducer, 0.1 parts of dry powder defoamer, and 0.1 parts of polypropylene fiber.

4. The microcement composite material based on coffee grounds modification according to claim 1, characterized in that, Component A includes, by weight parts ratio: 23 parts of coffee residue modified filler, 35 parts of cement-based gelling material, 10 parts of 20 - 40 mesh quartz sand, 18 parts of 40 - 80 mesh quartz sand, 23 parts of 80 - 120 mesh quartz sand, 18 parts of 400 mesh heavy calcium powder, 0.35 parts of polycarboxylate water reducer, 0.2 parts of dry powder defoamer, and 0.2 parts of polypropylene fiber.

5. The microcement composite material based on coffee grounds modification according to claim 1, characterized in that, Component A includes, by weight parts ratio: 25 parts of coffee residue modified filler, 45 parts of cement-based gelling material, 15 parts of 20 - 40 mesh quartz sand, 25 parts of 40 - 80 mesh quartz sand, 30 parts of 80 - 120 mesh quartz sand, 25 parts of 400 mesh heavy calcium powder, 0.6 parts of polycarboxylate water reducer, 0.3 parts of dry powder defoamer, and 0.3 parts of polypropylene fiber.

6. The microcement composite material based on coffee grounds modification according to claim 1, characterized in that, The preparation method of the coffee residue modified filler includes: Pretreatment: The coffee residue is dried at 80 - 120 °C until the moisture content < 5%, and then crushed to 80 - 200 mesh; Carbonization treatment: Under an inert gas environment, it is calcined for 1 - 2 hours, and the calcination temperature is 300 - 500 °C to form porous carbonized coffee residue; Surface modification: The porous carbonized coffee residue is coated with silane coupling agent or nano-SiO2 to enhance its interfacial bonding force with the cement matrix.

7. The microcement composite material based on coffee grounds modification according to claim 1, characterized in that, Its construction method includes the following steps: Step 1: Estimate the dosage of Component A according to the construction site, configure Component A according to the estimated dosage, and stir with a dry powder mortar mixer for 35 minutes and then fill; Step 2: Add Component B resin emulsion in proportion according to the estimated dosage of Component A, and stir at high speed for 5 minutes to form a homogeneous slurry; Step 3: Apply it to the substrate surface in 3 - 5 coats, with an interval of 8 - 12 hours between each coat, and cure at room temperature for 4 - 12 hours.