A mixture material and its application in preparing dumbbells

Abstract

This application relates to the technical field of fitness equipment, specifically to a mixture material and its application in the preparation of dumbbells, including raw materials: 20-40 parts of high-strength portland cement, 10-20 parts of ore, 10-20 parts of ore sand, 5-10 parts of mixed fiber, 2-3 parts of epoxy resin adhesive, 5-15 parts of wood particles, 5-15 parts of composite aerogel particles, 5-10 parts of steel shot, 3-8 parts of iron powder, 5-15 parts of perlite, and 20-40 parts of water; wherein, the mixed fiber includes graphene fiber and basalt fiber with a mass ratio of (2-3):(1-2); through the combination of specific raw materials, the prepared mixture material has a large specific gravity while improving the impact resistance of concrete and can be applied to the production of dumbbells.

Description

Technical Field

[0001] This application relates to the technical field of fitness equipment, and particularly to a mixture material and its application in the preparation of dumbbells. Background Art

[0002] A dumbbell is a commonly used sports equipment for enhancing muscle strength training. A dumbbell includes a middle pole and spherical balls at both ends. Most dumbbells are made of cast iron. Due to the large weight of cast iron, when performing dumbbell training, the sound of the dumbbell falling is relatively loud, causing a great impact on the dumbbell itself and also easily damaging the ground.

[0003] In order to prevent the dumbbell from damaging the floor during the falling process, a fully rubber dumbbell made of rubber has become a better choice. However, due to the relatively light specific gravity and insufficient mechanical properties of rubber, during the use of the product, deformation and fracture are likely to occur.

[0004] Putting a rubber sleeve outside the metal can reduce the impact when the dumbbell falls, but the integrity is not strong and the rubber sleeve is prone to moving and falling off. Filling inorganic fillers in the rubber outer layer can improve the integrity of the dumbbell. Because of its relatively large specific gravity and good mechanical strength, concrete has the prospect of being used as a filler in dumbbells. However, the general concrete has a low tensile strength and is brittle. When subjected to tensile forces such as being dropped, it is prone to cracking and even breaking under external impact, affecting the structural stability. Summary of the Invention

[0005] This application aims to at least overcome one of the defects of the prior art, and provides a mixture material and its application in the preparation of dumbbells. Through the combination of specific raw materials, the prepared mixture material has a large specific gravity while improving the drop resistance of concrete, and can be applied to the production of dumbbells.

[0006] In the first aspect, the embodiments of this application provide a mixture material, which is realized through the following technical solutions:

[0007] A mixture material, comprising the following raw materials in parts by weight for preparation:

[0008] 20 - 40 parts of high-strength portland cement, 10 - 20 parts of ore, 10 - 20 parts of ore sand, 5 - 10 parts of mixed fiber, 2 - 3 parts of epoxy resin adhesive, 5 - 15 parts of wood particles, 5 - 15 parts of composite aerogel particles, 5 - 10 parts of steel shot, 3 - 8 parts of iron powder, 5 - 15 parts of perlite, 20 - 40 parts of water;

[0009] Among them, the mixed fiber includes graphene fiber and basalt fiber with a mass ratio of (2 - 3):(1 - 2);

[0010] The preparation method of the composite aerogel particles includes the following steps:

[0011] S1. Dissolve 50 - 70 g of polytetrahydrofuran, 30 - 40 g of tolylene diisocyanate, and 1 - 2 g of dibutyltin dilaurate in 4 - 5 L of N,N - dimethylformamide, mix evenly, react at a temperature of 70 - 90 °C for 5 - 8 h, and add 3 - 4 g of cross - linker to obtain a polyurethane oligomer solution;

[0012] S2. Add 90 - 120 g of graphene fibers, and then disperse them using a variable - frequency high - speed disperser at a rotation speed of 6000 rpm / min for a dispersion duration of 25 - 35 min to disperse the graphene fibers using strong shear force; add 8 - 12 g of silica aerogel and 8 - 12 g of gel catalyst solution, continue stirring for 10 min, and ultrasonically disperse to make the mixture uniform to obtain a mixed solution;

[0013] S3. Pour the mixed solution obtained in step S2 into a mold and wait for gelation, and age it in a sealed container for 24 h to enable the gel to continue reacting and the network structure to continue to coarsen and grow, enhancing the strength of the gel's skeleton structure; take out the wet gel and place it in an acetone solution for replacement for 24 h, then soak it in 10 times the amount of tert - butanol for solvent exchange, and repeat the exchange three times;

[0014] S4. Directly place the wet gel obtained above in a freeze - dryer and freeze it at - 30 °C for 4 h, then take it out and place it in the upper layer for vacuum freeze - drying, and crush it to obtain composite aerogel particles.

[0015] A mixture material according to an embodiment of the present application has at least the following beneficial effects:

[0016] The mixture material of the present application selects different raw materials for combination. The graphene fibers in the mixed fibers have good mechanical strength, and the strength can reach 200 times that of ordinary steel. The graphene fibers have strong resistance to chemical corrosion and oxidation and can withstand the corrosion of various strong acids and alkalis. The basalt fibers in the mixed fibers have good corrosion resistance, high temperature and thermal shock stability, high elastic modulus and tensile strength. Blending high - strength Portland cement with the mixed fibers enables the mixed fibers to effectively fill the voids of particles such as ores, ore sands, wood particles, and perlite in the cement paste. At the same time, an epoxy resin adhesive is added for bonding. The epoxy resin adhesive can penetrate into the micro - pores of the concrete matrix and form mechanical interlocking and chemical bonding with the concrete, thereby enhancing the bonding force between the fibers and the concrete, promoting the combination of the fibers and the cement, and enhancing the strength and stability of the mixture material; when the mixture material is subjected to external forces, the fibers can bear part of the tensile stress, thereby reducing the stress on the cement matrix. This mechanical effect forms a dynamic equilibrium state between the fibers and the cement matrix, which is beneficial to the stable combination of the two.

[0017] The high-strength portland cement of the present application has high impermeability and corrosion resistance, can effectively resist the penetration and erosion of moisture and harmful substances, helps to reduce the formation of pores and defects inside the mixture material, protects the stability and durability of the structure of the mixture material. In addition, the high-strength portland cement has high wear resistance, can withstand large mechanical wear and impact force, and can improve the drop resistance of the mixture material.

[0018] The ores, ore sands, steel shot, iron powder, and perlite of the present application can improve the mechanical strength of the mixture material and increase the specific gravity of the mixture material. The wood particles and elastic resin particles of the present application can improve the elasticity and impact resistance of the mixture material. Through the mixing of the above raw materials, the mixture material is suitable for use as a filler for fitness equipment.

[0019] The composite aerogel of the present application is composed of graphene fiber, polyurethane, and silica. Ordinary silica aerogel is brittle and has poor mechanical strength and cannot be directly applied. After being compounded with graphene fiber and polyurethane, the prepared composite aerogel has enhanced mechanical properties and good corrosion resistance at the same time. Due to the porous structure inside the composite aerogel, the composite aerogel has good elasticity, can resist strong impact force, is not easy to break while ensuring drop resistance, and improves the impact resistance of the mixture material.

[0020] According to some embodiments of the present application, the cross-linking agent in step S1 is 1,3,5-tris(4-aminophenoxy)benzene.

[0021] According to some embodiments of the present application, the strength grade of the high-strength portland cement is P.O52.5.

[0022] According to some embodiments of the present application, the diameter of the mixed fiber is 10μm - 1000μm.

[0023] According to some embodiments of the present application, the length of the mixed fiber is 0.5cm - 2cm.

[0024] The blending of fibers with small diameter and short length can more effectively fill the voids between the particles in the cement paste, further improving the strength and stability of the mixture material.

[0025] According to some embodiments of the present application, the wood particles are selected from at least one of Manchurian ash, beech, camphorwood, walnut, oak, birch, fir, elm, and mahogany.

[0026] According to some embodiments of the present application, the average particle size of the wood particles is 3 - 6mm. The wood particles within this particle size range are convenient for combining with the cement paste, taking into account the elasticity of the wood particles and the strength of the mixture material, and enhancing the impact resistance of the mixture material.

[0027] According to some embodiments of the present application, the average particle size of the ore is 5 - 15 mm.

[0028] According to some embodiments of the present application, the average particle size of the perlite is 5 - 15 mm.

[0029] If the particle size of aggregates such as ore and perlite is too large, it will be difficult for the cement slurry to fill the voids between large particles, affecting the strength of the mixture material. On the contrary, if the particle size of aggregates such as ore and perlite is too small, the mixed raw material is mainly composed of cement slurry, and the friction between particles is too small, resulting in a decrease in the bonding performance between the mixed raw materials, which will also affect the strength of the mixture material.

[0030] According to some embodiments of the present application, the preparation method of the mixture material is as follows:

[0031] A1. Mix high-strength portland cement, ore, ore sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, steel shot, iron powder, perlite and water by weight, and stir for 10 min to obtain a mixed raw material;

[0032] A2. Vibrate the mixed raw material with a vibrating rod at a frequency of 200 - 300 Hz for 2 - 4 min, and cure for 21 days, watering 3 times a day, to obtain the mixture material.

[0033] In a second aspect, an embodiment of the present application provides a dumbbell comprising the mixture material.

[0034] A dumbbell comprising the mixture material according to an embodiment of the present application has at least the following beneficial effects:

[0035] The dumbbell of the present application has good mechanical properties, is not easy to deform, and also has good drop resistance, is not easy to break when subjected to external impact, and has a long service life.

[0036] According to some embodiments of the present application, the dumbbell includes a skeleton and a rubber coating layer.

[0037] Further, the material of the skeleton is steel bar. The expansion coefficient of the steel bar is close to that of the mixture material, which can be better fused, and there will be no gaps easily during subsequent use, improving the bonding strength.

[0038] Further, the skeleton includes two spherical frames and a connecting rod connecting the two spherical frames.

[0039] Furthermore, the two spherical frames are of the same size and are respectively arranged at both ends of the connecting rod. Through such a setting method, the weights of the two spherical frames are consistent, which is convenient for the balance of both ends of the dumbbell during use. When the spherical frame falls, it is convenient to disperse the impact force received, thereby improving the stability of the dumbbell.

[0040] Further, the material of the rubber coating layer is selected from one of synthetic rubber, rubber particles and rubber-plastic. Materials such as rubber, rubber particles and rubber-plastic can further enhance the elasticity of the dumbbell, and the floor is not easily damaged when the dumbbell falls.

[0041] In the third aspect, an embodiment of the present application provides a preparation method of the dumbbell, which is realized through the following technical solutions:

[0042] A preparation method of a dumbbell includes the following steps:

[0043] (1) Connect the two spherical frames and the connecting rod to make a skeleton;

[0044] (2) Mix high-strength portland cement, ore, ore sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, steel shot, iron powder, perlite and water according to parts by weight, and stir for 10 minutes to obtain a mixed raw material;

[0045] (3) Fill the skeleton and the mixed raw material into a dumbbell mold, use a vibrating rod to vibrate at a frequency of 200 - 300 Hz for 2 - 4 minutes, and cure for 21 days, watering 3 times a day, to obtain a dumbbell inner core;

[0046] (4) Use a rubber coating mold to coat the outer layer of the dumbbell

[0047] inner core by heat vulcanization, wherein the temperature of the upper mold is 145 °C and the temperature of the lower mold is 145 °C, to obtain a dumbbell.

[0048] According to the preparation method of the dumbbell in the embodiment of the present application, it has at least the following beneficial effects:

[0049] The present application uses a method of first filling and solidifying and then rubber coating to prepare the dumbbell, which can take into account the drop resistance while ensuring the mechanical strength of the dumbbell inner core. The dumbbell has good integrity, and it is not easy for the dumbbell inner core and the rubber coating layer to fall off during use, and the dumbbell is not easy to deform or break. The preparation method of the present application has simple steps, does not require complex production equipment, has a low cost, and is suitable for industrial production.

[0050] By solidifying the skeleton inside the mixture material, the present application further improves the mechanical strength of the dumbbell, and it is not easy to break or deform when subjected to external force impact.

[0051] In this application, the vibration of the vibrating rod makes the mixed raw materials evenly distributed in the mold, while facilitating the discharge of air bubbles in the mixed raw materials, making the mixed raw materials fully compact, and the formed mixture material is more solid and not easy to break. Specific embodiments

[0052] To make the purpose, technical solutions and advantages of this application clearer, the following will be further described in detail in combination with specific embodiments. The embodiments described herein are only a part of the embodiments of this application and should not be construed as a limitation on the protection scope of this application.

[0053] Preparation example 1 of composite aerogel particles

[0054] Preparation of composite aerogel particles:

[0055] S1. Dissolve 60 g of polytetrahydrofuran, 35 g of toluene diisocyanate, and 2 g of dibutyltin dilaurate in 4 L of N,N-dimethylformamide, mix evenly, react at 80 °C for 6 h, and add 3 g of 1,3,5-tris(4-aminophenoxy)benzene to obtain a polyurethane oligomer solution;

[0056] S2. Add 100 g of graphene fibers, and then disperse them using a variable-frequency high-speed disperser at a rotation speed of 6000 rpm / min for a dispersion duration of 30 min to disperse the graphene fibers using strong shear force; add 10 g of silica aerogel and 10 g of ammonia water solution, continue stirring for 10 min, and ultrasonically disperse to make them evenly mixed to obtain a mixed solution;

[0057] S3. Pour the mixed solution obtained in step S2 into a mold and wait for gelation, and age it in a sealed container for 24 h to enable the gel to continue reacting and the network structure to continue to coarsen and grow, enhancing the strength of the gel's skeleton structure; take out the wet gel and place it in an acetone solution for replacement for 24 h, and then soak it in 10 times the amount of tert-butanol for solvent exchange, repeating the exchange three times;

[0058] S4. Directly place the wet gel obtained above in a freeze dryer and freeze it at -30 °C for 4 h, then take it out and place it in the upper layer for vacuum freeze drying, and crush it to obtain composite aerogel particles.

[0059] Preparation example 2 of composite aerogel particles

[0060] Preparation of composite aerogel particles:

[0061] S1. Dissolve 70 g of polytetrahydrofuran, 30 g of toluene diisocyanate, and 1 g of dibutyltin dilaurate in 5 L of N,N-dimethylformamide, mix evenly, react at 70 °C for 8 h, and add 4 g of 1,3,5-tris(4-aminophenoxy)benzene to obtain a polyurethane oligomer solution;

[0062] S2. Add 100 g of graphene fibers, and then disperse them using a variable-frequency high-speed disperser at a rotation speed of 6000 rpm / min for 25 min to disperse the graphene fibers by means of strong shear force; add 8 g of silica aerogel and 12 g of ammonia water solution, continue stirring for 10 min, and ultrasonically disperse to make them evenly mixed to obtain a mixed solution;

[0063] S3. Pour the mixed solution obtained in step S2 into a mold and wait for gelation, and age it in a sealed container for 24 h to enable the gel to continue reacting and the network structure to continue to coarsen and grow, enhancing the strength of the gel's skeleton structure; take out the wet gel and place it in an acetone solution for replacement for 24 h, and then soak it in 10 times the amount of tert-butanol for solvent exchange, repeating the exchange three times;

[0064] S4. Directly place the obtained wet gel in a freeze dryer and freeze it at -30 °C for 4 h, then take it out and put it in the upper layer for vacuum freeze drying, and crush it to obtain composite aerogel particles.

[0065] Composite aerogel particles Comparative Example 1

[0066] Preparation of composite aerogel particles:

[0067] S1. Dissolve 60 g of polytetrahydrofuran, 35 g of toluene diisocyanate, and 2 g of dibutyltin dilaurate in 4 L of N,N-dimethylformamide, mix evenly, react at 80 °C for 6 h, and add 3 g of 1,3,5-tris(4-aminophenoxy)benzene to obtain a polyurethane oligomer solution;

[0068] S2. Add 10 g of silica aerogel and 10 g of ammonia water solution, continue stirring for 10 min, and ultrasonically disperse to make them evenly mixed to obtain a mixed solution;

[0069] S3. Pour the mixed solution obtained in step S2 into a mold and wait for gelation, and age it in a sealed container for 24 h to enable the gel to continue reacting and the network structure to continue to coarsen and grow, enhancing the strength of the gel's skeleton structure; take out the wet gel and place it in an acetone solution for replacement for 24 h, and then soak it in 10 times the amount of tert-butanol for solvent exchange, repeating the exchange three times;

[0070] S4. Directly place the obtained wet gel in a freeze dryer and freeze it at -30 °C for 4 h, then take it out and put it in the upper layer for vacuum freeze drying, and crush it to obtain composite aerogel particles.

[0071] Example 1

[0072] Preparation of the mixture material: Select raw materials by weight parts: 30 parts of high-strength portland cement, 15 parts of ore, 18 parts of ore sand, 8 parts of mixed fiber, 2 parts of epoxy resin adhesive, 10 parts of wood particles, 10 parts of composite aerogel particles prepared in Preparation Example 1, 7 parts of steel shot, 6 parts of iron powder, 9 parts of perlite, and 28 parts of water; wherein, the mixed fiber is composed of graphene fiber and basalt fiber mixed according to a mass ratio of 3:2; the diameter of the mixed fiber is 10 μm - 1000 μm; the length of the mixed fiber is 0.5 cm - 2 cm; the wood particles are composed of camphorwood and oak mixed according to a weight ratio of 1:1; the average particle size of the wood particles is 5 mm; the strength grade of the high-strength portland cement is P.O52.5; the average particle size of the ore is 10 mm; the average particle size of the perlite is 10 mm;

[0073] A1. Mix high-strength portland cement, ore, ore sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, steel shot, iron powder, perlite and water by weight parts, and stir for 10 min to obtain a mixed raw material;

[0074] A2. Vibrate the mixed raw material with a vibrating rod at a frequency of 250 Hz for 3 min, and cure for 21 days, watering 3 times a day, to obtain the mixture material.

[0075] Example 2

[0076] Preparation of the mixture material: Select raw materials by weight parts: 20 parts of high-strength portland cement, 10 parts of ore, 20 parts of ore sand, 10 parts of mixed fiber, 2 parts of epoxy resin adhesive, 15 parts of wood particles, 5 parts of composite aerogel particles prepared in Preparation Example 1, 5 parts of steel shot, 8 parts of iron powder, 5 parts of perlite, and 20 parts of water; wherein, the mixed fiber is composed of graphene fiber and basalt fiber mixed according to a mass ratio of 3:1; the diameter of the mixed fiber is 10 μm - 1000 μm; the length of the mixed fiber is 0.5 cm - 2 cm; the wood particles are selected from elm; the average particle size of the wood particles is 6 mm; the strength grade of the high-strength portland cement is P.O52.5; the average particle size of the ore is 5 mm; the average particle size of the perlite is 15 mm;

[0077] A1. Mix high-strength portland cement, ore, ore sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, steel shot, iron powder, perlite and water by weight parts, and stir for 10 min to obtain a mixed raw material;

[0078] A2. Vibrate the mixed raw material with a vibrating rod at a frequency of 200 Hz for 4 min, and cure for 21 days, watering 3 times a day, to obtain the mixture material.

[0079] Example 3

[0080] Preparation of the mixture material: Raw materials were selected by weight parts: 40 parts of high-strength portland cement, 20 parts of ore, 10 parts of ore sand, 5 parts of mixed fiber, 3 parts of epoxy resin adhesive, 5 parts of wood particles, 15 parts of composite aerogel particles prepared in Preparation Example 1, 10 parts of steel shot, 3 parts of iron powder, 15 parts of perlite, and 40 parts of water; wherein, the mixed fiber was composed of graphene fiber and basalt fiber mixed in a mass ratio of 2:2; the diameter of the mixed fiber was 10 μm - 1000 μm; the length of the mixed fiber was 0.5 cm - 2 cm; the wood particles were selected from walnut wood; the average particle size of the wood particles was 3 mm; the strength grade of the high-strength portland cement was P.O52.5; the average particle size of the ore was 15 mm; the average particle size of the perlite was 5 mm;

[0081] A1. Mix high-strength portland cement, ore, ore sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, steel shot, iron powder, perlite and water by weight parts, and stir for 10 min to obtain a mixed raw material;

[0082] A2. Vibrate the mixed raw material with a vibrating rod at a frequency of 300 Hz for 2 min, and cure for 21 days, watering 3 times a day, to obtain the mixture material.

[0083] Comparative Example 1

[0084] Preparation of the mixture material: Raw materials were selected by weight parts: 30 parts of high-strength portland cement, 15 parts of ore, 18 parts of ore sand, 8 parts of mixed fiber, 2 parts of epoxy resin adhesive, 10 parts of wood particles, 7 parts of steel shot, 6 parts of iron powder, 9 parts of perlite, and 28 parts of water; wherein, the mixed fiber was composed of graphene fiber and basalt fiber mixed in a mass ratio of 3:2; the diameter of the mixed fiber was 10 μm - 1000 μm; the length of the mixed fiber was 0.5 cm - 2 cm; the wood particles were composed of camphor wood and oak wood mixed in a weight ratio of 1:1; the average particle size of the wood particles was 5 mm; the strength grade of the high-strength portland cement was P.O52.5; the average particle size of the ore was 10 mm; the average particle size of the perlite was 10 mm;

[0085] A1. Mix high-strength portland cement, ore, ore sand, mixed fiber, epoxy resin adhesive, wood particles, steel shot, iron powder, perlite and water by weight parts, and stir for 10 min to obtain a mixed raw material;

[0086] A2. Vibrate the mixed raw material with a vibrating rod at a frequency of 250 Hz for 3 min, and cure for 21 days, watering 3 times a day, to obtain the mixture material.

[0087] Comparative Example 2

[0088] Preparation of the mixture material: Select raw materials by weight parts: 30 parts of high-strength Portland cement, 15 parts of ore, 18 parts of ore sand, 8 parts of mixed fiber, 2 parts of epoxy resin adhesive, 10 parts of wood particles, 10 parts of composite aerogel particles prepared in Comparative Example 1, 7 parts of steel shot, 6 parts of iron powder, 9 parts of perlite, and 28 parts of water; wherein, the mixed fiber is composed of graphene fiber and basalt fiber mixed according to a mass ratio of 3:2; the diameter of the mixed fiber is 10 μm - 1000 μm; the length of the mixed fiber is 0.5 cm - 2 cm; the wood particles are composed of camphor wood and oak wood mixed according to a weight ratio of 1:1; the average particle size of the wood particles is 5 mm; the strength grade of the high-strength Portland cement is P.O52.5; the average particle size of the ore is 10 mm; the average particle size of the perlite is 10 mm;

[0089] A1. Mix high-strength Portland cement, ore, ore sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, steel shot, iron powder, perlite and water by weight parts, and stir for 10 min to obtain a mixed raw material;

[0090] A2. Vibrate the mixed raw material with a vibrating rod at a frequency of 250 Hz for 3 min, and cure for 21 days, watering 3 times a day, to obtain the mixture material.

[0091] Comparative Example 3

[0092] Preparation of the mixture material: Select raw materials by weight parts: 30 parts of high-strength Portland cement, 15 parts of ore, 18 parts of ore sand, 2 parts of epoxy resin adhesive, 10 parts of wood particles, 10 parts of composite aerogel particles prepared in Preparation Example 1, 7 parts of steel shot, 6 parts of iron powder, 9 parts of perlite, and 28 parts of water; wherein, the wood particles are composed of camphor wood and oak wood mixed according to a weight ratio of 1:1; the average particle size of the wood particles is 5 mm; the strength grade of the high-strength Portland cement is P.O52.5; the average particle size of the ore is 10 mm; the average particle size of the perlite is 10 mm;

[0093] A1. Mix high-strength Portland cement, ore, ore sand, epoxy resin adhesive, wood particles, composite aerogel particles, steel shot, iron powder, perlite and water by weight parts, and stir for 10 min to obtain a mixed raw material;

[0094] A2. Vibrate the mixed raw material with a vibrating rod at a frequency of 250 Hz for 3 min, and cure for 21 days, watering 3 times a day, to obtain the mixture material.

[0095] Comparative Example 4

[0096] Preparation of the mixture material: The raw materials were selected by weight: 30 parts of high-strength portland cement, 15 parts of ore, 18 parts of sand, 8 parts of mixed fiber, 2 parts of epoxy resin adhesive, 10 parts of wood particles, 10 parts of the composite aerogel particles prepared in Preparation Example 1, 7 parts of steel shot, 6 parts of iron powder, 9 parts of perlite, and 28 parts of water; wherein, the mixed fiber was a mixture of graphene fiber and basalt fiber in a mass ratio of 3:2; the diameter of the mixed fiber was 10 μm - 1000 μm; the length of the mixed fiber was 0.5 cm - 2 cm; the wood particles were composed of camphorwood and oak in a weight ratio of 1:1; the average particle size of the wood particles was 5 mm; the strength grade of the high-strength portland cement was P.O52.5; the average particle size of the ore was 30 mm; the average particle size of the perlite was 30 mm;

[0097] A1. Mix the high-strength portland cement, ore, sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, steel shot, iron powder, perlite and water by weight, and stir for 10 min to obtain a mixed raw material;

[0098] A2. Vibrate the mixed raw material with a vibrating rod at a frequency of 250 Hz for 3 min, and cure for 21 days, watering 3 times a day, to obtain the mixture material.

[0099] Experimental Example

[0100] Take the mixture materials prepared in Examples 1 - 3 and Comparative Examples 1 - 4, and test the compressive strength, flexural strength, splitting tensile strength and impact resistance respectively. The test methods are as follows:

[0101] The compressive strength was tested according to the standard of GB / T 50081 - 2019;

[0102] The flexural strength was tested according to the standard of GB / T 50081 - 2019;

[0103] The splitting tensile strength was tested according to the standard of GB / T 50081 - 2019;

[0104] The test method for the impact resistance is as follows: Make the mixture material specimen into a cube with a side length of 10 cm. In this experiment, the drop hammer method was used for testing. The weight of the hammer was 3 kg, the lower end of the hammer was spherical, and the drop height was 0.53 m. The impact resistance of the concrete was expressed by the energy consumed per unit volume when the first visible crack appeared on the surface of the specimen under the repeated impact of the drop hammer, which was called the impact resistance and was expressed by the following formula: R 冲 = 9.8GHn / V; where, R 冲- Impact strength (J / cm 3 ), G - mass of impact hammer (kg), H - drop height of hammer (m), n - number of impacts (times), V - volume of specimen (cm 3 ).

[0105] The test data are shown in Table 1 below:

[0106] Table 1

[0107]

[0108] As can be seen from Table 1, the mixture materials prepared in Examples 1 - 3 of this application have excellent compressive strength, flexural strength, splitting tensile strength, and impact strength, improving the drop resistance while enhancing the mechanical properties of concrete.

[0109] The preparation raw materials of Comparative Example 1 do not contain composite aerogel particles, and the rest are the same as those of Example 1. The flexural strength, splitting tensile strength, impact strength, etc. of the mixture material prepared in Comparative Example 1 are significantly inferior to those of Example 1 of this application, indicating that the composite aerogel particles prepared in this application are very important for improving the performance of the mixture material. They not only have good elasticity but also can further improve the flexural and drop resistance of the mixture when combined with other components.

[0110] The composite aerogel particles used in the preparation raw materials of Comparative Example 2 are the composite aerogel particles prepared in Comparative Example 1. The preparation raw materials of the composite aerogel do not contain graphene fibers, and the rest are the same as those of Example 1. The flexural strength, splitting tensile strength, impact strength, etc. of the mixture material prepared in Comparative Example 2 are significantly inferior to those of Example 1 of this application, indicating that the specific combination of components in the composite aerogel particles in this application is very important for improving the performance of the mixture material. The aerogel compounded with graphene, polyurethane, and silica not only has good elasticity but also can further improve the flexural and drop resistance of the mixture when combined with other components.

[0111] The preparation raw materials of Comparative Example 3 do not contain mixed fibers, and the rest are the same as those of Example 1. The compressive strength, flexural strength, splitting tensile strength, and impact strength of the mixture material prepared in Comparative Example 3 are all poor, indicating that the mixed fibers in this application are filled into the voids in the cement paste, and at the same time, epoxy resin adhesive is added for bonding. The epoxy resin adhesive can penetrate into the tiny pores of the concrete matrix, form mechanical interlocking and chemical bonding with the concrete, thereby enhancing the bonding force between the fiber and the concrete, promoting the combination of the fiber and the cement, and enhancing the strength and stability of the mixture material.

[0112] The average particle size of the ore in the preparation raw materials of Comparative Example 4 was 30 mm, and the average particle size of the perlite was 30 mm. The rest were the same as those in Example 1. The compressive strength, flexural strength, splitting tensile strength, and impact strength of the mixture material prepared in Comparative Example 4 were all poor, indicating that an appropriate particle size is essential for preparing the mixture material of the present application. If the particle sizes of aggregates such as ore and perlite are too large, it will be difficult for the voids between large particles to be filled with cement slurry, affecting the strength and other properties of the mixture material.

[0113] Dumbbell Preparation Example 1

[0114] Preparation of the dumbbell:

[0115] (1) Weld two spherical frames and a connecting rod to make a skeleton; the material of the skeleton is steel bar, and the two spherical frames are of the same size and are respectively arranged at both ends of the connecting rod;

[0116] (2) Using the preparation raw materials selected in Example 1, mix high-strength portland cement, ore, ore sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, steel shot, iron powder, perlite and water according to parts by weight, and stir for 10 min to obtain a mixed raw material;

[0117] (3) Fill the skeleton and the mixed raw material into a dumbbell mold, and use a vibrating rod to vibrate at a frequency of 250 Hz for 3 min. After 21 days of curing, water is sprayed 3 times a day to obtain a dumbbell inner core;

[0118] (4) Use a rubber coating mold to coat the outer layer of the dumbbell inner core by heat vulcanization, where the temperature of the upper mold is 145 °C and the temperature of the lower mold is 145 °C to obtain a dumbbell; the material of the rubber coating layer is rubber particles.

[0119] The prepared dumbbell was tested, and the number of times it could withstand dropping reached 20,000 times. It has high strength, is strong and durable, has good damping effect, and will not damage the ground.

[0120] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, or variations can be made to these embodiments without departing from the principles and purposes of the present application, and the technical solutions after these changes, modifications, substitutions, or variations will all fall within the protection scope of the present application.

Claims

1. A mixture material for dumbbell filling, characterized in that, The preparation raw materials include the following parts by weight: 20 - 40 parts of high-strength Portland cement, 10 - 20 parts of ore, 10 - 20 parts of ore sand, 5 - 10 parts of mixed fiber, 2 - 3 parts of epoxy resin adhesive, 5 - 15 parts of wood particles, 5 - 15 parts of composite aerogel particles, 5 - 10 parts of steel shot, 3 - 8 parts of iron powder, 5 - 15 parts of perlite, 20 - 40 parts of water; Among them, the mixed fiber includes graphene fiber and basalt fiber with a mass ratio of (2 - 3):(1 - 2); The preparation method of the composite aerogel particles includes the following steps: S1. Dissolve 50 - 70 g of polytetrahydrofuran, 30 - 40 g of toluene diisocyanate and 1 - 2 g of dibutyltin dilaurate in 4 - 5 L of N,N - dimethylformamide, mix evenly, react at a temperature of 70 - 90 °C for 5 - 8 h, and add 3 - 4 g of crosslinking agent to obtain a polyurethane oligomer solution; S2. Add 90 - 120 g of graphene fiber, and then disperse it using a variable-frequency high-speed disperser at a rotation speed of 6000 rpm / min for a dispersion duration of 25 - 35 min to disperse the graphene fiber using strong shear force; add 8 - 12 g of silica aerogel and 8 - 12 g of gel catalyst solution, continue stirring for 10 min, and ultrasonically disperse to make it mix evenly to obtain a mixed solution; S3. Pour the mixed solution obtained in step S2 into a mold and wait for gelation, and age it in a sealed container for 24 h to enable the gel to continue reacting and the network structure to continue to coarsen and grow, enhancing the skeleton structure strength of the gel; take out the wet gel and place it in acetone solution for replacement for 24 h, and then soak it in 10 times of tert-butanol for solvent exchange, repeating the exchange three times; S4. Directly place the wet gel obtained above in a freeze dryer and freeze it at -30 °C for 4 h, then take it out and place it in the upper layer for vacuum freeze drying, and crush it to obtain composite aerogel particles; The crosslinking agent described in step S1 is 1,3,5 - tris(4 - aminophenoxy)benzene; The diameter of the mixed fiber is 10 μm - 1000 μm, and the length of the mixed fiber is 0.5 cm - 2 cm; The average particle size of the ore is 5 - 15 mm, and the average particle size of the perlite is 5 - 15 mm.

2. The mixture material for dumbbell filling according to claim 1, characterized in that, The wood particles are selected from at least one of Manchurian ash, beech, camphorwood, walnut, oak, birch, fir, elm, and mahogany, and / or the average particle size of the wood particles is 3 - 6 mm.

3. A mixture material for dumbbell filling according to claim 1, characterized in that, The preparation method of the mixture material includes the following steps: A1. Mix high-strength Portland cement, ore, ore sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, steel shot, iron powder, perlite and water according to parts by weight, and stir for 10 min to obtain a mixed raw material; A2. Vibrate the mixed raw material using a vibrating rod at a frequency of 200 - 300 Hz for 2 - 4 min, and cure it for 21 days, watering 3 times a day to obtain the mixture material.

4. A dumbbell comprising the mixture material according to any one of claims 1 to 3, characterized in that, The dumbbell includes a skeleton and a rubber coating layer.

5. The dumbbell according to claim 4, wherein The material of the frame is steel bars; the frame comprises two spherical frames and a connecting rod connecting the two spherical frames; the two spherical frames are of the same size and are respectively arranged at two ends of the connecting rod.

6. The dumbbell according to claim 5, characterized in that, The material of the rubber coating is selected from one of synthetic rubber, rubber particles and rubber plastic.

7. A method for preparing a dumbbell as described in claim 6, characterized in that, The following steps are involved: (1) Connecting the two spherical frames and the connecting rod to make a skeleton; (2) mixing high-strength silicate cement, ore, mineral sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, cut wire shot, iron powder, perlite and water according to weight parts, and stirring for 10 minutes to obtain a mixed raw material; (3) Fill the skeleton and the mixed raw materials into a dumbbell mold, vibrate the mold at a frequency of 200-300 Hz for 2-4 minutes using a vibrating rod, and after 21 days of curing and watering 3 times a day, obtain the dumbbell core; (4) Using a rubber-coated mold, the outer layer of the dumbbell inner core is coated with rubber by heating and vulcanization, wherein the upper mold temperature is 145° C. and the lower mold temperature is 145° C. to obtain a dumbbell.

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