A coffee residue PC composite material, its preparation method and application

Abstract

The present invention discloses a coffee ground PC composite material, a preparation method, and an application thereof. The coffee ground PC composite material is used to make a luggage shell and / or accessories, and comprises the following components in parts by weight: 90-95 parts of PC resin, 3-5 parts of modified coffee grounds, 0.1-1 parts of a coupling agent, and 1-5 parts of a toughening agent. The modified coffee grounds are prepared by the following steps: a. washing the coffee grounds and soaking them for 1.5 hours to remove floating impurities; b. sieving the precipitate to remove large particles; c. boiling and drying them at 90°C for 10 hours; d. grinding and sieving to obtain 1000-mesh coffee grounds; e. boiling and drying them at 90°C for 10 hours; and f. spraying bisphenol A emulsion on the dried coffee grounds to mix them into 800-mesh powder to obtain the modified coffee grounds.

Description

Technical Field

[0001] The present invention relates to the field of new materials, and in particular to a coffee grounds PC composite material and a preparation method and application thereof. Background Art

[0002] Currently, some composite materials made from coffee grounds are used in coffee cups and straws. However, these materials are relatively simple and have limited applications. Plant fibers such as wheat straw are used in luggage handles, but these materials lack structural strength and are only used in limited areas, making them inapplicable. They also lack practical properties like fragrance and antibacterial properties.

[0003] The existing technology has the following disadvantages:

[0004] 1. Existing coffee grounds composite materials have a narrow application range, such as coffee cups, straws, etc., and have not been used in travel luggage products;

[0005] 2. The current application of plant fibers in luggage is limited to handles, which only differentiates the appearance;

[0006] 3. The structural strength is relatively low;

[0007] 4. Does not contain other enhancement functions, such as fragrance, antibacterial, etc.

[0008] Studies have shown that coffee grounds contain natural substances, such as caffeine, which have antibacterial properties. The caffeic acid in coffee grounds can eliminate inflammation, scavenge free radicals, and inhibit fungal growth. The use of coffee ground PC composite materials in the interior and exterior of suitcases imparts antibacterial properties to the luggage body, interior (lining fabrics and clothing), exterior (hand contact areas), and accessories, while also infusing them with a natural coffee aroma. Summary of the Invention

[0009] To overcome the deficiencies in the prior art, the present invention provides a coffee grounds-PC composite material, a preparation method, and applications thereof. The resulting coffee grounds-PC composite material has the characteristics of a novel material appearance, a light coffee aroma, heat resistance, oil resistance, antibacterial properties, environmental protection, and biodegradability. While improving functional applications, it also increases its tensile strength, ensuring smooth operation of the blister process during suitcase manufacturing.

[0010] In order to achieve the above-mentioned purpose of the invention, the technical solutions adopted to solve the technical problems are as follows:

[0011] A first aspect of the present invention provides a coffee grounds PC composite material, which is used to make luggage shells and / or accessories. The coffee grounds PC composite material comprises the following components in parts by weight: 90-95 parts of PC resin, 3-5 parts of modified coffee grounds, 0.1-1 part of a coupling agent, and 1-5 parts of a toughening agent;

[0012] The modified coffee grounds are prepared by the following steps:

[0013] a. After cleaning the coffee grounds, soak them for 1.5 hours to remove floating impurities;

[0014] b. Screen the sediment to remove large particles;

[0015] c. Boiling drying, drying at 90℃ for 10 hours;

[0016] d. Grind and sieve to obtain 1000 mesh coffee grounds;

[0017] e. Boiling drying, drying at 90℃ for 10 hours;

[0018] f. Spraying a modification agent onto the dried coffee grounds and spray-mixing them into a powder of 800 mesh to obtain the modified coffee grounds; wherein the modification agent is a bisphenol A emulsion.

[0019] In one embodiment of the present invention, the toughening agent is a copolymer of acrylate and methyl methacrylate.

[0020] In one embodiment of the present invention, the coupling agent is KH570.

[0021] In one embodiment of the present invention, in step f, the modification aid is bisphenol A emulsion, and the mass ratio of the dried coffee grounds to the bisphenol A emulsion is (5-10):1.

[0022] A second aspect of the present invention provides a method for preparing the coffee grounds PC composite material, comprising the following steps:

[0023] Step 1: weigh the formulated amount of PC resin, modified coffee grounds, coupling agent, and toughening agent;

[0024] Step 2: Dry the PC resin at 100-120°C for 4-6 hours;

[0025] Step 3: Mix and stir the dried PC resin with the toughening agent and coupling agent for 20-60 minutes;

[0026] Step 4: Clean the granulator screw;

[0027] Step 5: Discharge the mixture of PC resin, coupling agent and toughening agent at a uniform speed from the front discharge port;

[0028] Step 6: Add modified coffee grounds at a uniform speed to the rear section of the granulator; wherein the temperatures from the feeding section to the discharging section are: 180°C-200°C, 220°C-230°C, 250°C-270°C, and 250°C-220°C respectively;

[0029] Step seven: granulation to obtain coffee grounds PC composite material.

[0030] A third aspect of the present invention provides use of the coffee grounds PC composite material in the preparation of luggage.

[0031] In one embodiment of the present invention, the suitcase includes a case shell and accessories, and the case shell and / or the accessories are made of the above-mentioned coffee grounds PC composite material.

[0032] In one embodiment of the present invention, the box shell includes a box shell surface layer, a middle layer and an inner composite material layer, and at least one of the box shell surface layer, the middle layer and the inner composite material layer is made of the above-mentioned coffee grounds PC composite material.

[0033] In one embodiment of the present invention, the inner composite material layer is made of the above-mentioned coffee grounds PC composite material.

[0034] In one embodiment of the present invention, the case shell is made from coffee grounds PC composite sheet material using a thermoforming process. After thermoforming, the semi-finished case shell material is trimmed and punched. Hardware and plastic components such as pull rods, wheels, handles, and a combination lock are then assembled, completing the application of the coffee grounds PC composite material in luggage.

[0035] In one embodiment of the present invention, the plate material of the box shell before vacuum forming is a coffee ground PC composite plate material with a thickness of 1.0-4.5 mm formed by rolling and compounding the composite material layers of the box shell surface layer, middle layer and inner layer through a plate drawing machine.

[0036] In one embodiment of the present invention, in the process of preparing coffee grounds PC composite particles, in the process of rolling and compounding the surface layer, middle layer and inner layer of the box shell composite material into a board through a pumping machine, and in the process of hot-blistering the coffee grounds PC composite board into a box shell, the adapted process parameters are similar to the molding process parameters of conventional PC polycarbonate. The coffee grounds PC composite material exhibits excellent physical property enhancement and good processing performance.

[0037] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0038] 1. Recycled coffee grounds and PC are used to make a new environmentally friendly composite material, which is first used in travel luggage products. This expands the application scope of recycling coffee grounds, reduces the use of plastic, and achieves the environmental protection goals of environmental protection, plastic reduction, and carbon reduction;

[0039] 2. The application of coffee grounds PC composite material inside the suitcase can utilize the aroma of coffee grounds themselves to slowly release the natural plant coffee aroma inside the suitcase, so that the fragrance inside the suitcase can be maintained for a long time, giving users a pleasant experience.

[0040] 3. The coffee grounds PC composite material of the present invention has natural antibacterial properties. It can play an antibacterial role inside the suitcase to prevent odor after long-term use. It can also play an antibacterial role on the outside of the suitcase where it comes into contact with the handle for a long time.

[0041] 4. Due to the addition of coffee grounds, the coffee grounds PC composite material of the present invention has a certain biodegradability, which helps to reduce the impact of plastic waste on the environment.

[0042] 5. The coffee grounds PC composite material provided by the present invention has the characteristics of novel material appearance, light coffee aroma, heat resistance, oil resistance, antibacterial properties, environmental protection and biodegradability. It improves its tensile strength while improving its functional application, ensuring the smooth implementation of the blister process in the suitcase manufacturing process.

[0043] 6. The preparation method of the coffee grounds PC composite material provided by the present invention is simple, the raw material price cost is low, and it is easy to realize industrial production.

[0044] 7. The pretreatment process of coffee grounds in the present invention makes the coffee ground plant fiber less likely to foam and degenerate, and can also withstand a short-term high-temperature environment of 180°C-270°C without being easily carbonized, which is beneficial to the granulation and rolling forming process of the coffee ground PC composite material. After the coffee ground PC composite material is granulated and rolled, it can still emit a light natural plant coffee aroma with sustained release; and it exhibits efficient natural antibacterial efficacy. SGS laboratory tests show an inhibition rate of 99.9% against Staphylococcus aureus. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0046] Figure 1 This is a schematic diagram of a conventional box shell plate structure with a double-layer structure in an application example of the present invention;

[0047] Figure 2 This is a schematic diagram of a conventional box shell plate structure with a three-layer structure in an application example of the present invention;

[0048] Figure 3 This is a schematic diagram of the structure of the luggage case shell after molding when the new composite material of coffee grounds is applied to the inner layer in an application example of the present invention.

[0049] The correspondence between each mark and the component name is as follows: box shell surface layer 1, inner composite material layer 2, middle layer 3. DETAILED DESCRIPTION

[0050] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0051] Example 1

[0052] This embodiment provides a modified coffee grounds, which is prepared by the following steps:

[0053] First, wash the coffee grounds with clean water and soak them for 1.5 hours to remove floating impurities;

[0054] The sediment is screened to remove large particles;

[0055] Boiling drying, drying at 90℃ for 10 hours;

[0056] Grind and sieve to obtain 1000 mesh coffee grounds;

[0057] Boiling drying, drying at 90℃ for 10 hours;

[0058] The dried coffee grounds were sprayed with a modification agent, wherein the modification agent was a bisphenol A emulsion, with a mass ratio of 8:1 between the coffee grounds and the bisphenol A emulsion. The mixture was sprayed to form an 800-mesh powder, which was the modified coffee grounds. In this embodiment, the bisphenol A emulsion was Dow Chemical DER331.

[0059] Example 2

[0060] This embodiment provides a coffee grounds PC composite material, which is used to make luggage shells and / or accessories. The coffee grounds PC composite material exhibits highly effective natural antibacterial properties, with an inhibition rate against Staphylococcus aureus reaching 99.9% according to SGS laboratory testing (Table 4).

[0061] The coffee grounds PC composite material in this embodiment includes the following components: PC resin, modified coffee grounds, a coupling agent, and a toughening agent, wherein the mass ratio of PC resin, modified coffee grounds, coupling agent, and toughening agent is 90:5:1:4.

[0062] The modified coffee grounds in this example are the modified coffee grounds prepared in Example 1.

[0063] In order to improve the toughness and impact resistance of the material, the toughening agent in this embodiment is a copolymer of acrylate and methyl methacrylate (the mass ratio of the copolymer of acrylate and methyl methacrylate is 1:1).

[0064] The coupling agent in this embodiment is KH570.

[0065] The polycarbonate (PC, also known as PC plastic) selected in this embodiment has good impact resistance, high refractive index, good processing performance, and has UL94 V-2 flame retardancy without the need for additives.

[0066] Specifically, the brand of the polycarbonate in this embodiment is Covestro ET3113.

[0067] The method for preparing the coffee grounds PC composite material in this embodiment includes the following steps:

[0068] Step 1: weigh the formulated amount of PC resin, modified coffee grounds, coupling agent, and toughening agent;

[0069] Step 2: Dry the PC resin at 100-120°C for 4-6 hours;

[0070] Step 3: Mix and stir the dried PC resin with the toughening agent and coupling agent for 20-60 minutes;

[0071] Step 4: Clean the granulator screw;

[0072] Step 5: Discharge the mixture of PC resin, coupling agent and toughening agent at a uniform speed from the front discharge port;

[0073] Step 6: Add modified coffee grounds at a uniform speed to the rear section of the granulator; wherein the temperatures from the feeding section to the discharging section are: 180°C-200°C, 220°C-230°C, 250°C-270°C, and 250°C-220°C respectively;

[0074] Step seven: granulation to obtain coffee grounds PC composite material.

[0075] Example 3

[0076] This embodiment provides a coffee grounds PC composite material, which is used to make a luggage shell and / or accessories. The coffee grounds PC composite material exhibits highly effective natural antibacterial properties, with an SGS laboratory test showing an inhibition rate of 99.9% against Staphylococcus aureus.

[0077] The coffee grounds PC composite material in this embodiment includes the following components: PC resin, modified coffee grounds, a coupling agent, and a toughening agent, wherein the mass ratio of PC resin, modified coffee grounds, coupling agent, and toughening agent is 92:4:0.75:3.25.

[0078] The modified coffee grounds in this example are the modified coffee grounds prepared in Example 1.

[0079] In order to improve the toughness and impact resistance of the material, the toughening agent in this embodiment is a copolymer of acrylate and methyl methacrylate (the mass ratio of the copolymer of acrylate and methyl methacrylate is 1:1).

[0080] The coupling agent in this embodiment is KH570.

[0081] The polycarbonate (PC, also known as PC plastic) selected in this embodiment has good impact resistance, high refractive index, good processing performance, and has UL94 V-2 flame retardancy without the need for additives.

[0082] Specifically, the brand of the polycarbonate in this embodiment is Covestro ET3113.

[0083] The method for preparing the coffee grounds PC composite material in this embodiment includes the following steps:

[0084] Step 1: weigh the formulated amount of PC resin, modified coffee grounds, coupling agent, and toughening agent;

[0085] Step 2: Dry the PC resin at 100-120°C for 4-6 hours;

[0086] Step 3: Mix and stir the dried PC resin with the toughening agent and coupling agent for 20-60 minutes;

[0087] Step 4: Clean the granulator screw;

[0088] Step 5: Discharge the mixture of PC resin, coupling agent and toughening agent at a uniform speed from the front discharge port;

[0089] Step 6: Add modified coffee grounds at a uniform speed to the rear section of the granulator; wherein the temperatures from the feeding section to the discharging section are: 180°C-200°C, 220°C-230°C, 250°C-270°C, and 250°C-220°C respectively;

[0090] Step seven: granulation to obtain coffee grounds PC composite material.

[0091] Example 4

[0092] This embodiment provides a coffee grounds PC composite material, which is used to make a luggage shell and / or accessories. The coffee grounds PC composite material exhibits highly effective natural antibacterial properties, with an SGS laboratory test showing an inhibition rate of 99.9% against Staphylococcus aureus.

[0093] The coffee grounds PC composite material in this embodiment includes the following components: PC resin, modified coffee grounds, a coupling agent, and a toughening agent, wherein the mass ratio of PC resin, modified coffee grounds, coupling agent, and toughening agent is 95:3:0.5:1.5.

[0094] The modified coffee grounds in this example are the modified coffee grounds prepared in Example 1.

[0095] In order to improve the toughness and impact resistance of the material, the toughening agent in this embodiment is a copolymer of acrylate and methyl methacrylate (the mass ratio of the copolymer of acrylate and methyl methacrylate is 1:1).

[0096] The coupling agent in this embodiment is KH570.

[0097] The polycarbonate (PC, also known as PC plastic) selected in this embodiment has good impact resistance, high refractive index, good processing performance, and has UL94 V-2 flame retardancy without the need for additives.

[0098] Specifically, the brand of the polycarbonate in this embodiment is Covestro ET3113.

[0099] Step 1: weigh the formulated amount of PC resin, modified coffee grounds, coupling agent, and toughening agent;

[0100] Step 2: Dry the PC resin at 100-120°C for 4-6 hours;

[0101] Step 3: Mix and stir the dried PC resin with the toughening agent and coupling agent for 20-60 minutes;

[0102] Step 4: Clean the granulator screw;

[0103] Step 5: Discharge the mixture of PC resin, coupling agent and toughening agent at a uniform speed from the front discharge port;

[0104] Step 6: Add modified coffee grounds at a uniform speed to the rear section of the granulator; wherein the temperatures from the feeding section to the discharging section are: 180°C-200°C, 220°C-230°C, 250°C-270°C, and 250°C-220°C respectively;

[0105] Step seven: granulation to obtain coffee grounds PC composite material.

[0106] Example 5

[0107] This embodiment provides a coffee grounds PC composite material, which is used to make a suitcase shell and / or accessories.

[0108] The composition of the coffee grounds PC composite material in this embodiment differs from that in Example 2 only in that the mass ratio of PC resin, modified coffee grounds, coupling agent, and toughening agent in this embodiment is 84:10:1.5:4.5.

[0109] Example 6

[0110] This embodiment provides a coffee grounds PC composite material, which is used to make a suitcase shell and / or accessories.

[0111] The composition of the coffee grounds PC composite material in this embodiment differs from that in Example 2 only in that the mass ratio of PC resin, modified coffee grounds, coupling agent, and toughening agent in this embodiment is 72:20:2:6.

[0112] Example 7

[0113] This embodiment provides a coffee grounds PC composite material, which is used to make a suitcase shell and / or accessories.

[0114] The composition of the coffee grounds PC composite material in this embodiment differs from that in Example 2 only in that the mass ratio of PC resin, modified coffee grounds, coupling agent, and toughening agent in this embodiment is 60:30:2.5:7.5.

[0115] Example 8

[0116] This embodiment provides a coffee grounds PC composite material, which is used to make a suitcase shell and / or accessories.

[0117] The composition of the coffee grounds PC composite material in this embodiment differs from that in Example 2 only in that the mass ratio of PC resin, modified coffee grounds, coupling agent, and toughening agent in this embodiment is 48:40:3:9.

[0118] Comparative Example 1

[0119] This embodiment provides a coffee grounds PC composite material, which is used to make a suitcase shell and / or accessories.

[0120] The composition of the coffee grounds PC composite material in this embodiment differs from that in Example 2 only in that the coffee grounds in this embodiment are unmodified coffee grounds.

[0121] The problem with unmodified coffee grounds is that they are easily carbonized during the granulation and extrusion processes, sticking to the inner wall of the barrel and the extrusion die, and are not resistant to high temperatures.

[0122] Comparative Example 2

[0123] The material provided in this comparative example is a typical PC material for suitcases (Covestro ET3113).

[0124] Experimental example

[0125] In this experimental example, the properties of the coffee grounds PC composite material provided in Example 4 and the material provided in Comparative Example 2 were tested. The test results are shown in Table 1:

[0126] Table 1

[0127] Physical properties\Material name Comparative Example 2 (Covestro ET3113) Example 4 Coffee grounds PC composite new material Test standards Performance Comparison tensile strength 70Mpa 75Mpa ASTM D638 Enhanced Elongation at break 130% 110% ASTM D638 - Yield stress 65Mpa 65Mpa ASTM D638 Flat Bending strength 96Mpa 86Mpa ASTM D790 - flexural modulus 2350Mpa 2200Mpa ASTM D790 - Izod notched impact strength 800J / m 620J / m ASTM D256 - odor Tasteless and odorless Coffee plant aroma - Increased fragrance characteristics Melting temperature 215-230℃ 220℃-240℃ - Improved temperature resistance Carbonization temperature none 270℃+ - Easy to carbonize above 270℃

[0128] In this experimental example, the performance parameters of the composite material formed by PC material (Covestro ET3113) and different percentages of coffee grounds are shown in Table 2:

[0129] Table 2

[0130] Example Tensile strength MPa Elongation at break % Bending strength MPa Flexural modulus MPa 23℃ notched impact strength kJ / ㎡ -30℃ notched impact strength kJ / ㎡ Density g / cm³ Test standards ISO527 ISO527 ISO178 ISO178 ISO179 ISO179 ISO1183 Example 4 (PC + 3% coffee grounds) 75 110 86 2200 62.00 10.18 1.192 Example 3 (PC + 4% coffee grounds) 73.8 105.5 86.5 2218 62.82 10.13 1.189 Example 2 (PC + 5% coffee grounds) 72.2 95 87.2 2235 63.44 10.23 1.185 Example 5 (PC + 10% coffee grounds) 60.44 62.02 90.60 2267.00 64.48 10.21 1.18 Example 6 (PC + 20% coffee grounds) 56.96 58 86.86 2211.67 66.55 10.01 1.179 Example 7 (PC + 30% coffee grounds) 56.67 10.06 90.36 2283.67 68.09 10.32 1.181 Example 8 (PC + 40% coffee grounds) 57.47 14.38 88.62 2272.00 69.95 9.9 1.178

[0131] From the test data of the physical properties of the above high-proportion coffee grounds composite PC material embodiment, it can be seen that: with the increase of the proportion of coffee grounds, the tensile strength of the material decreases significantly, the elongation at break drops drastically, and the 23°C notched impact strength increases slightly linearly; because the tensile strength and elongation at break of the material play a dominant role in the plate drawing and blister forming process of suitcase products, the high-proportion coffee grounds composite PC material is not suitable for use in suitcase products.

[0132] In this experimental example, the heat-resistant carbonization performance of the coffee grounds PC composite material provided in Example 1 and the coffee grounds PC composite material in Example 2 was tested. The test results are shown in Table 3.

[0133] Table 3

[0134] Material Type Carbonization temperature unit Test Method Example 2 (Coffee Grounds PC Composite Material) 260—270 ℃ TGA thermogravimetric analysis Comparative Example 1 (PC composite non-modified coffee grounds) 220—230 ℃ TGA thermogravimetric analysis

[0135] In this experimental example, the antibacterial effect of the coffee grounds PC composite material provided in Example 2 was tested using the test method: ISO 22196:2011 Measurement of the antibacterial activity of plastics and other non-porous surfaces. The test results are shown in Table 4.

[0136] Table 4

[0137] Detection of bacterial species Staphylococcus aureus ATCC6538P Inoculum concentration (CFU / ml) <![CDATA[7.0×10 5 ]]> Inoculation volume (ml) 0.4 <![CDATA[U0]]> 4.23 <![CDATA[U t ]]> 6.34 <![CDATA[A t ]]> 2.82 <![CDATA[B(CFU / cm 2 )]]> <![CDATA[2.2×10 6 ]]> <![CDATA[C(CFU / cm 2 )]]> <![CDATA[6.5×10 2 ]]> Antimicrobial activity value R 3.5 Antibacterial rate (%) >99.9

[0138] In the antibacterial effect experiment, the untreated control sample was a plastic film without antibacterial properties, provided by SGS laboratory. In Table 4, U0 is the number of bacteria obtained after elution of the untreated control sample at 0h contact time (CFU / cm 2 ), U t is the number of bacteria obtained after elution of the untreated control sample after 24 h of contact time (CFU / cm 2 ), A t The number of bacteria obtained after elution of the sample after 24 h of contact time (CFU / cm 2 ) logarithm of the antibacterial rate (%), the calculation formula is [(BC) × B] × 100%, where B is the average bacterial count of the untreated control sample 24 hours after inoculation (CFU / cm2 ), C is the average bacterial count 24 hours after sample inoculation (CFU / cm 2 Before the antibacterial effect test, the samples were pretreated as follows: wiping the sample surface with 70% alcohol, rinsing with sterile water, and air-drying.

[0139] Application Examples

[0140] This application discloses a suitcase containing a new coffee grounds PC composite material, including suitcase accessories and a suitcase shell made of the above-mentioned new coffee grounds PC composite material.

[0141] Furthermore, the luggage accessories include a drawbar, wheels, handles, combination locks, footpegs, or cup holders. Preferably, the coffee grounds composite material is used on larger interior components such as the drawbars, wheels, and handles, meeting the luggage industry testing standard QB / T 2155-2018 and providing a continuous, light coffee aroma within the suitcase. However, this embodiment does not impose specific usage limitations; the coffee grounds composite material can be used on interior fabrics, the inner walls of the case, the drawbar support, wheel support, handle support, combination lock support, and footpeg support, providing both decorative and antibacterial properties.

[0142] like Figure 3 The suitcase shell includes a shell surface layer 1, an intermediate layer 3 and an inner composite material layer 2. The inner composite material layer 2 and / or the shell surface layer 1 are made of coffee grounds PC composite new material.

[0143] In the existing technology, the surface material of the luggage box shell is generally pure PC material, or PC + ABS alloy material, which is extruded into a plate, then formed by vacuum forming through a box body mold, and then trimmed and punched by cutting equipment to remove excess scraps to form a semi-finished box shell that is ready for installation. Figure 1 and Figure 2 As shown, the box shell plate is generally divided into a double-layer structure (box shell surface layer 1 + inner layer composite material layer 2) ( Figure 1 ) or three-layer structure (shell surface layer 1 + middle layer 3 + inner composite material layer 2) ( Figure 2 ); the surface layer 1 of the box shell is the outer layer, which is a masterbatch layer that can be colored; the inner composite material layer 2 or the intermediate layer 3 + inner composite material layer 2 is the inner layer, which is formed by crushing and melting the scraps in the above-mentioned trimming process and then adding a certain proportion of new materials, usually appearing gray; the box shell surface layer 1 + intermediate layer 3 + inner composite material layer 2 structure is less used, and the intermediate layer 3 is usually a colored layer the same as the box shell surface layer 1.

[0144] In this embodiment, the coffee grounds composite material is applied to the outer shell for coloring and antibacterial properties. Its application to the inner composite material layer allows for the slow release of coffee aroma within the box after molding and also provides antibacterial properties. Due to the board structure, the grounds in the middle layer naturally contain a small amount of coffee grounds. Preferably, the coffee grounds composite material is applied to the inner composite material layer.

[0145] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A coffee grounds PC composite material, characterized in that: The coffee grounds PC composite material is used to make luggage shells and / or accessories. The coffee grounds PC composite material comprises the following components in parts by weight: 90-95 parts of PC resin, 3-5 parts of modified coffee grounds, 0.1-1 parts of coupling agent, and 1-5 parts of toughening agent. The modified coffee grounds are prepared by the following steps: a. After cleaning the coffee grounds, soak them for 1.5 hours to remove floating impurities; b. Screen the sediment to remove large particles; c. Boiling drying, drying at 90℃ for 10 hours; d. Grind and sieve to obtain 1000 mesh coffee grounds; e. Boiling drying, drying at 90℃ for 10 hours; f. Spraying bisphenol A emulsion onto the dried coffee grounds and spray-mixing them into a powder of 800 mesh to obtain the modified coffee grounds.

2. The coffee grounds PC composite material according to claim 1, characterized in that The toughening agent is a copolymer of acrylate and methyl methacrylate.

3. The coffee grounds PC composite material according to claim 1, characterized in that The coupling agent is KH570.

4. The coffee grounds PC composite material according to claim 1, characterized in that In step f, the modification aid is bisphenol A emulsion, and the mass ratio of the dried coffee grounds to the bisphenol A emulsion is (5-10):

1.

5. The method for preparing the coffee grounds PC composite material according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: weigh the formulated amount of PC resin, modified coffee grounds, coupling agent, and toughening agent; Step 2: Dry the PC resin at 100-120°C for 4-6 hours; Step 3: Mix and stir the dried PC resin with the toughening agent and coupling agent for 20-60 minutes; Step 4: Clean the granulator screw; Step 5: Discharge the mixture of PC resin, coupling agent and toughening agent at a uniform speed from the front discharge port; Step 6: Add modified coffee grounds at a uniform speed to the rear section of the granulator; wherein the temperatures from the feeding section to the discharging section are: 180°C-200°C, 220°C-230°C, 250°C-270°C, and 250°C-220°C respectively; Step seven: granulation to obtain coffee grounds PC composite material.

6. Use of the coffee grounds PC composite material according to any one of claims 1 to 4 in the preparation of luggage.

7. The use according to claim 6, characterized in that The suitcase comprises a case shell and accessories, and the case shell and / or the accessories are made of the coffee grounds PC composite material according to any one of claims 1 to 4.

8. The use according to claim 7, characterized in that The box shell comprises a box shell surface layer, a middle layer and an inner composite material layer, and at least one of the box shell surface layer, the middle layer and the inner composite material layer is made of the coffee grounds PC composite material according to any one of claims 1-4.

9. The use according to claim 8, characterized in that The inner composite material layer is made of the coffee grounds PC composite material according to any one of claims 1 to 4.

10. The use according to claim 8, characterized in that The box shell is made of coffee grounds PC composite board through a hot plastic forming process, and after the plastic forming, the edges are trimmed and punched to form a semi-finished box shell material.

11. The use according to claim 10, characterized in that The plate material of the box shell before vacuum forming is a coffee ground PC composite plate material with a thickness of 1.0-4.5 mm formed by compounding the composite material layers of the box shell surface layer, the middle layer and the inner layer through a plate drawing machine.

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