Slow-release snow-melting and deicing material and preparation method thereof

Abstract

The invention relates to the technical field of snow-melting and deicing materials, and particularly discloses a slow-release snow-melting and deicing material and a preparation method thereof. The slow-release snow-melting and deicing material comprises a snow-melting core material and a reinforced shell layer wrapping the surface of the snow-melting core material, the snow-melting core material is coffee residue porous carbon powder loaded with snow-melting components, and the reinforced shell layer is prepared from, by weight, 10-20 parts of polyurethane prepolymer, 10-20 parts of styrene-butadiene latex, 0.5-2 parts of cross-linking agent, 10-20 parts of rubber powder and 5-10 parts of reinforced fibers. 0.5-1 part of a wetting dispersant and 1-2 parts of a hydrophobic agent. According to the invention, the snow-melting and deicing speed of the slow-release snow-melting and deicing material can be maintained, the compression resistance and wear resistance of the slow-release snow-melting and deicing material can be improved, and crushing or pulverization of the snow-melting and deicing material in the storage or carrying process can be reduced.

Description

Technical Field

[0001] This invention relates to the technical field of snow-melting agent materials, and in particular to a slow-release snow-melting and de-icing material and its preparation method. Background Technology

[0002] Winter snow and ice accumulation severely impact traffic safety and efficiency. Currently, common snow and ice melting methods mainly include mechanical removal or manual application of de-icing agents. While salt-based de-icing agents such as sodium chloride are inexpensive and fast-acting, their melting effect is short-lived, requiring multiple applications and increasing manpower and resource consumption. Therefore, there is a need to develop a de-icing agent with a longer-lasting melting effect.

[0003] In related technologies, a method for preparing a slow-release porous carbon material from coffee grounds for snow melting and ice removal is disclosed. The method comprises the following steps: S1, coffee grounds pretreatment: coffee grounds are washed, dried, and ground, then mixed with ferric chloride in water, dried, and then carbonized at high temperature to obtain coffee grounds carbides; S2, activation treatment: the coffee grounds carbides are mixed and ground evenly with a chemical activator, then activated at high temperature, cooled to room temperature, and then washed clean with dilute hydrochloric acid and deionized water sequentially to obtain the porous carbon material from coffee grounds; S3, preparation of the snow melting and ice removal material: the porous carbon material from coffee grounds is ground and sieved, then mixed with a supersaturated inorganic salt solution, dried, and then mixed with a hydrophobic surface modifier, and then dried to obtain the slow-release porous carbon material from coffee grounds for snow melting and ice removal.

[0004] However, the porous carbon matrix of coffee grounds is brittle and is prone to breakage or pulverization during storage or transportation. Summary of the Invention

[0005] In order to improve the compressive strength and wear resistance of snow melting and ice-melting materials based on coffee grounds, and to reduce the breakage or pulverization of snow melting and ice-melting materials during storage or transportation, this application provides a slow-release snow melting and ice-melting material and its preparation method.

[0006] Firstly, this application provides a slow-release snow-melting and ice-de-de-icing material, which adopts the following technical solution: A slow-release snow-melting and ice-de-de-icing material includes a snow-melting core material and a reinforcing shell layer wrapped around the surface of the snow-melting core material. The snow-melting core material is porous coffee grounds carbon powder loaded with snow-melting components. The reinforcing shell layer comprises the following raw materials in parts by weight: 10-20 parts polyurethane prepolymer, 10-20 parts styrene-butadiene latex, 0.5-2 parts crosslinking agent, 10-20 parts rubber powder, 5-10 parts reinforcing fiber, 0.5-1 part wetting and dispersing agent, and 1-2 parts hydrophobic agent.

[0007] In one specific implementation, the solid content of both the polyurethane prepolymer and the styrene-butadiene latex is 40-50%.

[0008] In one specific implementation, the adhesive powder is waste tire powder with a particle size of 40-80 mesh.

[0009] In one specific implementation, the reinforcing fiber is aramid pulp.

[0010] In one specific implementation, the porous carbon powder made from coffee grounds has a particle size of 100-200 mesh.

[0011] Secondly, this application provides a method for preparing a slow-release snow-melting and ice-de-de-icing material, which adopts the following technical solution: A method for preparing a slow-release snow-melting and ice-de-de-icing material includes the following steps: The polyurethane prepolymer, styrene-butadiene latex, wetting and dispersing agent, and hydrophobic agent are mixed evenly to obtain the treatment solution; Mix the adhesive powder, reinforcing fiber, and snow melting core material evenly to obtain a dry mixture; Under stirring, the treatment liquid is sprayed into the dry mixture, then the crosslinking agent is sprayed in, and after stirring evenly, it is heat-treated at 80-110℃ for 30-60 minutes to obtain a slow-release snow melting and de-icing material.

[0012] In one specific feasible implementation, the snow melting core material comprises 100 parts of porous carbon powder made from coffee grounds, 30-50 parts of composite inorganic salt, and 1-3 parts of organic corrosion inhibitor.

[0013] In one specific feasible implementation, the snow melting core material is prepared by the following steps: dissolving the composite inorganic salt and organic corrosion inhibitor in water under a water bath at 40-60℃, and obtaining an aqueous solution after complete dissolution; Under vacuum, porous carbon powder made from coffee grounds is immersed in an aqueous solution to obtain a suspension. The suspension is then dried at 80-90°C until the water content is 2-4 wt% to obtain the snow melting core material.

[0014] In summary, this application has the following beneficial effects: 1. This application can form a core-shell structured slow-release snow melting and de-icing material by using a snow melting core material and a reinforcing shell layer wrapped around the surface of the snow melting core material. By limiting the raw material ratio and preparation method of the snow melting core material and the reinforcing shell layer, the compressive strength and wear resistance of the slow-release snow melting and de-icing material can be improved while maintaining the snow melting and de-icing speed, which helps to reduce the breakage or pulverization of the snow melting and de-icing material during storage or transportation.

[0015] 2. In this application, aramid pulp is preferably used, which can further improve the compressive strength and wear resistance of the slow-release snow melting and de-icing material.

[0016] 3. This application uses waste tire powder with a particle size of 40-80 mesh, polyurethane prepolymer and styrene-butadiene latex with a solid content of 40-50%, and porous carbon powder made from coffee grounds with a particle size of 100-200 mesh. This can also obtain a slow-release snow melting and ice-melting material with a relatively balanced snow melting and ice-melting speed, compressive strength and wear resistance. Detailed Implementation

[0017] Unless otherwise specified, all raw materials used in this application were commercially available. Coffee grounds, moisture content <5%, particle size 100 mesh. Sodium tungstate, potassium formate, calcium acetate, and sodium lactate, all AR grade. Polymethylene polyphenyl polyisocyanate, CAS number 9016-87-9, 99% purity. Wetting and dispersing agent, model BYK-110. Hydrophobic agent: Kh-560 silane coupling agent. Aramid pulp, length 1.8±0.4 mm. Polyurethane prepolymer, CAS number 103837-45-2. Styrene-butadiene latex, CAS number 25085-39-6. Polyester fiber, length 1.8±0.4 mm. Chopped basalt fiber, length 1.8±0.4 mm.

[0018] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0019] Example Example 1 This embodiment provides a slow-release snow-melting and de-icing material, including a snow-melting core material and a reinforcing shell layer wrapped around the surface of the snow-melting core material.

[0020] This embodiment also provides a method for preparing a slow-release snow-melting and ice-de-de-icing material, including the following steps: The snow melting core material comprises the following raw materials: 100 kg of porous coffee grounds with a particle size between 100-200 mesh, 40 kg of composite inorganic salts, and 2 kg of sodium tungstate. The composite inorganic salts consist of potassium formate, calcium acetate, and sodium lactate in a weight ratio of 1:1:1.

[0021] Porous coffee grounds carbon powder was prepared as follows: Coffee grounds were dried to constant weight in an oven at 105℃, then pulverized to obtain coffee grounds powder. The coffee grounds powder was evenly spread in a ceramic boat, with a thickness not exceeding 1 cm. The ceramic boat was placed in the constant temperature zone of a tube furnace, and nitrogen gas was introduced at a flow rate of 3 L / min as a protective gas for 30 minutes to purge the air from the furnace. The temperature was increased from room temperature to 350℃ at a rate of 5℃ / min and held for 40 minutes. The temperature was then increased to 750℃ at the same rate and held at this temperature for 1 hour. Under continuous nitrogen purging, the furnace was allowed to cool naturally to below room temperature, yielding porous coffee grounds carbon powder. After sieving, porous coffee grounds carbon powder with a particle size between 100-200 mesh was obtained.

[0022] The reinforcing shell layer comprises the following raw materials: 15 kg of polyurethane prepolymer with a solid content of 45%, 15 kg of styrene-butadiene latex with a solid content of 45%, 1.2 kg of polymethylene polyphenyl polyisocyanate, 15 kg of waste tire powder with a particle size between 40-80 mesh, 7.5 kg of aramid pulp, 0.8 kg of wetting and dispersing agent, and 1.5 kg of hydrophobic agent.

[0023] The composite inorganic salt and organic corrosion inhibitor were dissolved in water under a 50°C water bath condition and stirred until completely dissolved to obtain an aqueous solution.

[0024] Under vacuum, porous carbon powder made from coffee grounds is immersed in an aqueous solution and stirred until homogeneous to obtain a suspension. The suspension is then transferred to a vacuum drying apparatus and dried at 85°C until the moisture content is 3 wt%, yielding the snow-melting core material.

[0025] According to the formula, the polyurethane prepolymer, styrene-butadiene latex, wetting and dispersing agent, and hydrophobic agent are mixed evenly to obtain the treatment solution.

[0026] Waste tire powder, aramid pulp, and snow melting core material are mixed evenly to obtain a dry mixture.

[0027] Under stirring, the treatment liquid is sprayed into the dry mixture, followed by the spraying of polymethylene polyphenyl polyisocyanate. After stirring evenly, the mixture is heat-treated at 95°C for 45 minutes to obtain a slow-release snow-melting and ice-de-de-icing material.

[0028] Example 2 The only difference between this embodiment and Embodiment 1 is that the snow melting core material includes the following raw materials: 100 kg of porous carbon powder made from coffee grounds, 30 kg of composite inorganic salts, and 1 kg of sodium tungstate.

[0029] Example 3 The only difference between this embodiment and Embodiment 1 is that the snow melting core material includes the following raw materials: 100 kg of porous carbon powder made from coffee grounds, 50 kg of composite inorganic salts, and 3 kg of sodium tungstate.

[0030] Example 4 The only difference between this embodiment and Embodiment 1 is that the reinforcing shell layer includes the following raw materials: 10 kg of polyurethane prepolymer with a solid content of 45%, 10 kg of styrene-butadiene latex with a solid content of 45%, 0.5 kg of polymethylene polyphenyl polyisocyanate, 10 g of waste tire powder with a particle size between 40-80 mesh, 5 kg of aramid pulp, 0.5 kg of wetting and dispersing agent, and 1 kg of hydrophobic agent.

[0031] Example 5 The only difference between this embodiment and Embodiment 1 is that the reinforcing shell layer includes the following raw materials: 20 kg of polyurethane prepolymer with a solid content of 45%, 20 kg of styrene-butadiene latex with a solid content of 45%, 2 kg of polymethylene polyphenyl polyisocyanate, 20 g of waste tire powder with a particle size between 40-80 mesh, 10 kg of aramid pulp, 1 kg of wetting and dispersing agent, and 2 kg of hydrophobic agent.

[0032] Example 6 The only difference between this embodiment and Embodiment 1 is that an equal amount of polyurethane prepolymer with a solid content of 40% is used to replace the polyurethane prepolymer with a solid content of 45%, and an equal amount of styrene-butadiene latex with a solid content of 40% is used to replace the styrene-butadiene latex with a solid content of 45%.

[0033] Example 7 The only difference between this embodiment and Embodiment 1 is that an equal amount of polyurethane prepolymer with a solid content of 50% is used to replace the polyurethane prepolymer with a solid content of 45%, and an equal amount of styrene-butadiene latex with a solid content of 50% is used to replace the styrene-butadiene latex with a solid content of 45%.

[0034] Example 8 The only difference between this embodiment and Embodiment 1 is that an equal amount of porous coffee grounds with a particle size between 10-90 mesh is used to replace porous coffee grounds with a particle size between 10-200 mesh.

[0035] Example 9 The only difference between this embodiment and Embodiment 1 is that an equal amount of porous coffee grounds with a particle size between 100 and 200 mesh is used instead of porous coffee grounds with a particle size between 210 and 300 mesh.

[0036] Example 10 The only difference between this embodiment and Embodiment 1 is that an equal amount of waste tire powder with a particle size between 10 and 30 mesh is used to replace waste tire powder with a particle size between 40 and 80 mesh.

[0037] Example 11 The only difference between this embodiment and Embodiment 1 is that an equal amount of waste tire powder with a particle size between 40 and 80 mesh is replaced with waste tire powder with a particle size between 90 and 120 mesh.

[0038] Example 12 The only difference between this embodiment and Embodiment 1 is that an equal amount of polyester fiber is used to replace the aramid pulp.

[0039] Example 13 The only difference between this embodiment and Embodiment 1 is that an equal amount of chopped basalt fiber is used to replace the aramid pulp.

[0040] Example 14 The only difference between this embodiment and Embodiment 1 is that, in the preparation method of the slow-release snow-melting and ice-de-de-icing material, the polyurethane prepolymer, styrene-butadiene latex, wetting and dispersing agent, and hydrophobic agent are mixed evenly according to the formula to obtain the treatment liquid.

[0041] Waste tire powder, aramid pulp, and snow melting core material are mixed evenly to obtain a dry mixture.

[0042] Under stirring, the treatment liquid is sprayed into the dry mixture, followed by the spraying of polymethylene polyphenyl polyisocyanate. After stirring evenly, the mixture is heat-treated at 80°C for 60 minutes to obtain a slow-release snow-melting and ice-de-de-icing material.

[0043] Example 15 The only difference between this embodiment and Embodiment 1 is that, in the preparation method of the slow-release snow-melting and ice-de-de-icing material, the polyurethane prepolymer, styrene-butadiene latex, wetting and dispersing agent, and hydrophobic agent are mixed evenly according to the formula to obtain the treatment liquid.

[0044] Waste tire powder, aramid pulp, and snow melting core material are mixed evenly to obtain a dry mixture.

[0045] Under stirring, the treatment liquid is sprayed into the dry mixture, followed by the spraying of polymethylene polyphenyl polyisocyanate. After stirring evenly, the mixture is heat-treated at 110°C for 30 minutes to obtain a slow-release snow-melting and ice-de-de-icing material.

[0046] Example 16 The only difference between this embodiment and Embodiment 1 is that, in the preparation method of the slow-release snow-melting and ice-de-de-icing material, the composite inorganic salt and organic corrosion inhibitor are dissolved in water under a 40°C water bath condition, and stirred until completely dissolved to obtain an aqueous solution.

[0047] Under vacuum, porous coffee grounds are immersed in an aqueous solution and stirred until homogeneous to obtain a suspension. The suspension is then transferred to a vacuum drying apparatus and dried at 80°C until the moisture content is 4 wt%, yielding the snow-melting core material.

[0048] Example 17 The only difference between this embodiment and Embodiment 1 is that, in the preparation method of the slow-release snow-melting and ice-de-de-icing material, the composite inorganic salt and organic corrosion inhibitor are dissolved in water under a 50°C water bath condition, and stirred until completely dissolved to obtain an aqueous solution.

[0049] Under vacuum, porous coffee grounds are immersed in an aqueous solution and stirred until homogeneous to obtain a suspension. The suspension is then transferred to a vacuum drying apparatus and dried at 90°C until the moisture content is 4 wt%, yielding the snow-melting core material.

[0050] Comparative Example Comparative Example 1 The only difference between this comparative example and Example 1 is that, in the raw materials and preparation method of the slow-release snow-melting and ice-de-de-icing material, an equal amount of porous carbon powder made from coffee grounds is used to replace sodium tungstate.

[0051] Comparative Example 2 The only difference between this comparative example and Example 1 is that, in the raw materials and preparation method of the slow-release snow-melting and ice-de-de-icing material, an equal amount of polyurethane prepolymer is used to replace styrene-butadiene latex.

[0052] Comparative Example 3 The only difference between this comparative example and Example 1 is that, in the raw materials and preparation method of the slow-release snow-melting and ice-de-de-icing material, an equal amount of polyurethane prepolymer is used to replace polymethylene polyphenyl polyisocyanate.

[0053] Comparative Example 4 The only difference between this comparative example and Example 1 is that, in the raw materials and preparation method of the slow-release snow-melting and de-icing material, an equal amount of polyurethane prepolymer is used to replace the waste tire powder.

[0054] Comparative Example 5 The only difference between this comparative example and Example 1 is that, in the raw materials and preparation method of the slow-release snow-melting and ice-de-de-icing material, an equal amount of polyurethane prepolymer is used to replace the aramid pulp.

[0055] Performance testing The following performance tests were conducted on Examples 1-17 and Comparative Examples 1-5: Compressive strength test: According to ASTM D4179 / ISO 12900-2 "Standard test method for compressive strength of catalyst particles", the compressive strength of single particles of slow-release snow melting and de-icing materials prepared in each example and comparative example was tested, as shown in Table 1.

[0056] Abrasion resistance testing: According to ASTM C131 / C535, a reciprocating abrasion tester was used. The slow-release de-icing material was pre-mounted with resin, cured, and then a smooth test surface was polished to obtain the sample. A wear test piece was pressed onto the sample surface with a normal load of 10N. The reciprocating stroke was set to 10mm, the frequency to 1Hz, and the total number of cycles to 100. The sample mass was accurately weighed before and after the test. The volumetric wear rate was calculated using the formula: Volumetric wear rate = (sample mass before test - sample mass after test) / (ρ × sliding distance), in mm. 3 / N·m. The volumetric wear rate of the slow-release snow-melting and de-icing materials prepared in each embodiment and comparative example was tested, and is shown in Table 1.

[0057] Snow melting and ice de-icing speed test: A 30mm thick ice layer was placed in a test chamber at a temperature of -30℃. Slow-release snow melting and ice de-icing material was sprinkled on the surface of the ice layer at a dosage of 30g / m². 2The ice melting process was observed, and the time required for the ice to completely melt was recorded. Based on the formula: snow melting rate (mm / min) = ice thickness / time for complete ice melting, the snow melting rate of the slow-release snow melting materials prepared in each embodiment and comparative example was calculated.

[0058] The test results are shown in Table 1.

[0059] Table 1 Combining Example 1 and Comparative Examples 1-5 with Table 1, it can be seen that compared to Example 1, the compressive strength of individual particles in Comparative Examples 2-5 is significantly reduced, the volumetric wear rate is significantly increased, and the snow-melting and ice-de-reducing rate changes little. Example 1 shows a significantly reduced snow-melting and ice-de-reducing rate, with little change in individual particle compressive strength and volumetric wear rate. This indicates that using the raw material ratio and preparation method of Example 1 can improve the compressive strength and wear resistance of the slow-release snow-melting and ice-de-reducing material while maintaining its snow-melting and ice-de-reducing rate, helping to reduce breakage or pulverization of the material during storage or transportation.

[0060] As can be seen from Examples 1-17 and Table 1, the single-particle compressive strength of Examples 1-17 is greater than 4 MPa, and the volumetric wear rate is less than 4.5 mm. 3 The melting and de-icing rates were all greater than 1.2 mm / min. This indicates that by using the raw material ratios and preparation methods within the range of Examples 1-17, it is possible to improve the compressive strength and wear resistance of the slow-release snow-melting and de-icing material while maintaining its melting and de-icing rate.

[0061] A comparison of the various embodiments and Table 1 shows that, compared to other fibers, using aramid pulp can further improve the compressive strength and abrasion resistance of the slow-release snow-melting and ice-removing material. Using waste tire powder with a particle size of 40-80 mesh, polyurethane prepolymer and styrene-butadiene latex with a solid content of 40-50%, and porous coffee grounds carbon powder with a particle size of 100-200 mesh, a slow-release snow-melting and ice-removing material with a relatively balanced snow-melting and ice-removing speed, compressive strength, and abrasion resistance can also be obtained.

[0062] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A slow-release snow-melting and ice-de-de-icing material, characterized in that, The product includes a snow-melting core material and a reinforcing shell layer wrapped around the surface of the snow-melting core material. The snow-melting core material is porous coffee grounds carbon powder loaded with snow-melting components. The reinforcing shell layer comprises the following raw materials in parts by weight: 10-20 parts polyurethane prepolymer, 10-20 parts styrene-butadiene latex, 0.5-2 parts crosslinking agent, 10-20 parts rubber powder, 5-10 parts reinforcing fiber, 0.5-1 part wetting and dispersing agent, and 1-2 parts hydrophobic agent.

2. The slow-release snow-melting and ice-de-de-icing material according to claim 1, characterized in that, The solid content of both the polyurethane prepolymer and the styrene-butadiene latex is 40-50%.

3. The slow-release snow-melting and ice-de-de-icing material according to claim 1, characterized in that, The rubber powder is waste tire powder with a particle size of 40-80 mesh.

4. The slow-release snow-melting and de-icing material according to claim 1, characterized in that, The reinforcing fiber is aramid pulp.

5. The slow-release snow-melting and ice-de-de-icing material according to claim 1, characterized in that, The porous carbon powder made from coffee grounds has a particle size of 100-200 mesh.

6. A method for preparing a slow-release snow-melting and de-icing material as described in any one of claims 1-5, characterized in that, Includes the following steps: The polyurethane prepolymer, styrene-butadiene latex, wetting and dispersing agent, and hydrophobic agent are mixed evenly to obtain the treatment solution; Mix the adhesive powder, reinforcing fiber, and snow melting core material evenly to obtain a dry mixture; Under stirring, the treatment liquid is sprayed into the dry mixture, then the crosslinking agent is sprayed in, and after stirring evenly, it is heat-treated at 80-110℃ for 30-60 minutes to obtain a slow-release snow melting and de-icing material.

7. The method for preparing the slow-release snow-melting and de-icing material according to claim 6, characterized in that, The snow melting core material comprises 100 parts of porous carbon powder made from coffee grounds, 30-50 parts of composite inorganic salt, and 1-3 parts of organic corrosion inhibitor.

8. The method for preparing the slow-release snow-melting and ice-de-de-icing material according to claim 7, characterized in that, The snow melting core material is prepared according to the following steps: The composite inorganic salt and organic corrosion inhibitor were dissolved in water under a water bath at 40-60℃. After complete dissolution, an aqueous solution was obtained. Under vacuum, porous carbon powder made from coffee grounds is immersed in an aqueous solution to obtain a suspension. The suspension is then dried at 80-90°C until the water content is 2-4 wt% to obtain the snow melting core material.

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