Mixture material and application thereof in preparation of dumbbell

Abstract

The invention relates to the technical field of fitness equipment, in particular to a mixture material and application thereof in dumbbell preparation, and the mixture material comprises the following 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 wire cut shots and 3-8 parts of iron powder. 5 to 15 parts of perlite and 20 to 40 parts of water; wherein the mixed fiber comprises graphene fiber and basalt fiber in a mass ratio of (2-3): (1-2); through matching of specific raw materials, the prepared mixture material has large specific gravity while improving the falling resistance of concrete, and can be applied to manufacturing of dumbbells.

Description

Technical Field

[0001] The present application relates to the technical field of fitness equipment, and in particular to a mixture material and its application in preparing dumbbells. Background Art

[0002] Dumbbells are a common piece of sports equipment used to enhance muscle strength training. Dumbbells include a middle support rod and balls at both ends. Dumbbells are mostly made of cast iron. Due to the heavy weight of cast iron, when doing dumbbell training, the dumbbells make a loud noise when falling, which causes a great impact on the dumbbells themselves and is also easy to cause damage to the ground.

[0003] In order to prevent the dumbbells from damaging the floor when falling, all-rubber dumbbells made of rubber become a better choice. However, due to the light specific gravity and insufficient mechanical properties of rubber, they are prone to deformation and breakage during use.

[0004] Putting a rubber sleeve on the outside of the metal can reduce the impact when the dumbbell falls, but the integrity is not strong and the rubber sleeve is easy to move and fall off. Filling the outer layer of the rubber with inorganic fillers can improve the integrity of the dumbbell. Concrete has the prospect of being used as a filler in dumbbells because of its large specific gravity and good mechanical strength. However, the tensile strength of general concrete is low and the material is brittle. When subjected to tensile forces such as being thrown, it is easy to crack or even break under the impact of external forces, affecting the stability of the structure. Summary of the invention

[0005] The present application aims to overcome at least one of the defects of the prior art and provide a mixture material and its application in the preparation of dumbbells. By matching specific raw materials, the prepared mixture material has a larger specific gravity while improving the drop resistance of concrete, and can be used to make dumbbells.

[0006] In a first aspect, the present invention provides a mixture material, which is realized by the following technical solutions:

[0007] A mixture material comprises the following raw materials in parts by weight:

[0008] 20-40 parts of high-strength Portland cement, 10-20 parts of ore, 10-20 parts of mineral 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 cut wire shot, 3-8 parts of iron powder, 5-15 parts of perlite, and 20-40 parts of water;

[0009] Wherein, the hybrid fiber comprises graphene fiber and basalt fiber in a mass ratio of (2-3):(1-2);

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

[0011] S1. 50-70 g of polytetrahydrofuran, 30-40 g of toluene diisocyanate and 1-2 g of dibutyltin dilaurate are dissolved in 4-5 L of N, N-dimethylformamide, mixed evenly, reacted at a temperature of 70-90 ° C for 5-8 h, and 3-4 g of a crosslinking agent is added to obtain a polyurethane oligomer solution;

[0012] S2. 90-120 g of graphene fiber was added, and then dispersed using a variable frequency high-speed disperser at a speed of 6000 rpm / min, and the dispersion time was 25-35 min, and the graphene fiber was dispersed by strong shear force; 8-12 g of silica aerogel and 8-12 g of gel catalyst solution were added, stirring was continued for 10 min, and ultrasonic dispersion was performed to mix them evenly 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 hours to allow the gel to continue to react, the network structure to continue to coarsen and grow, and enhance the skeleton structure strength of the gel; take out the wet gel and place it in an acetone solution for replacement for 24 hours, and then immerse it in 10 times tert-butanol for solvent exchange, and repeat the exchange three times;

[0014] S4. The wet gel obtained above was directly frozen in a freeze dryer at -30°C for 4 hours, then taken out and placed in the upper layer for vacuum freeze drying, and crushed 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 mixed material of the present application is matched with different raw materials. The graphene fiber in the mixed fiber has good mechanical strength, which can be 200 times that of ordinary steel. The graphene fiber has strong resistance to chemical corrosion and oxidation, and can withstand corrosion from various strong acids and strong alkalis. The basalt fiber in the mixed fiber has good corrosion resistance, high temperature resistance and thermal shock stability, high elastic modulus and tensile strength. High-strength silicate cement is blended with the mixed fiber so that the mixed fiber can be effectively filled into the gaps of particles such as ore, mineral sand, wood particles, perlite, etc. in the cement slurry. 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 and form mechanical bite 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 mixed material. When the mixed material is subjected to external force, the fiber can bear part of the tensile stress, thereby reducing the stress of the cement matrix. This mechanical action forms a dynamic equilibrium state between the fiber and the cement matrix, which is conducive to the stable combination of the two.

[0017] The high-strength silicate cement of the present application has high impermeability and erosion 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, and protects the stability and durability of the mixture material structure. In addition, the high-strength silicate cement has high wear resistance, can withstand greater mechanical wear and impact, and can improve the drop resistance of the mixture material.

[0018] The ore, mineral sand, wire cut 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. By matching and mixing 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 composited with graphene fiber, polyurethane and silica. Ordinary silica aerogel is relatively brittle and has poor mechanical strength and cannot be directly used. After being composited with graphene fiber and polyurethane, the prepared composite aerogel has enhanced mechanical properties and good corrosion resistance. Since the composite aerogel has a porous structure inside, the composite aerogel has good elasticity and can resist strong impact force. It is not easy to break while ensuring drop resistance, thereby improving the impact resistance of the mixed 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 silicate cement is P.O52.5.

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

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

[0024] Blending of small diameter and short length fibers can more effectively fill the gaps between 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 ash, beech, camphor, walnut, oak, birch, fir, elm, and redwood.

[0026] According to some embodiments of the present application, the average particle size of the wood particles is 3-6 mm. Wood particles within this particle size range are easy to combine with cement slurry, taking into account the elasticity of the wood particles and the strength of the mixed material, thereby enhancing the impact resistance of the mixed 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, the gaps between the large particles will be difficult to be filled with cement slurry, affecting the strength of the mixed material. Conversely, if the particle size of aggregates such as ore and perlite is too small, the mixed raw materials are mainly cement slurry, and the friction between the particles is too small, resulting in reduced bonding performance between the mixed raw materials, which will also affect the strength of the mixed material.

[0030] According to some embodiments of the present application, the method for preparing the mixture material is:

[0031] A1. According to parts by weight, high-strength Portland cement, ore, ore sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, cut wire shot, iron powder, perlite and water were mixed and stirred for 10 minutes to obtain a mixed raw material;

[0032] A2. The mixed raw materials were vibrated 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, a mixture material was obtained.

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

[0034] A dumbbell containing 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. It is not easy to break when impacted by external forces 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] Furthermore, the material of the skeleton is steel bars. The expansion coefficients of the steel bars and the mixture material are similar, so they can be better integrated, and gaps are less likely to appear during subsequent use, thereby improving the bonding strength.

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

[0039] Furthermore, the two spherical racks are of the same size and are respectively arranged at the two ends of the connecting rod. With such an arrangement, the weight of the two spherical racks is consistent, which facilitates the balance of the two ends of the dumbbell during use, and when the spherical racks fall, it is convenient to disperse the impact force received, thereby improving the stability of the dumbbell.

[0040] Furthermore, the material of the rubber coating is selected from one of synthetic rubber, rubber particles and rubber plastic. Rubber, rubber particles and rubber plastic can further enhance the elasticity of the dumbbell, and the dumbbell is not easy to damage the floor when it falls.

[0041] In a third aspect, the present application provides a method for preparing the dumbbell, which is achieved through the following technical solutions:

[0042] A method for preparing a dumbbell comprises the following steps:

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

[0044] (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;

[0045] (3) filling the skeleton and the mixed raw materials into a dumbbell mold, vibrating the mold at a frequency of 200-300 Hz for 2-4 minutes using a vibrating rod, curing the mold for 21 days, watering the mold 3 times a day, and obtaining a dumbbell core;

[0046] (4) Use the rubber mold to heat and vulcanize the dumbbell

[0047] The outer layer of the inner core is covered with rubber, wherein the upper mold temperature is 145° C., and the lower mold temperature is 145° C., to obtain a dumbbell.

[0048] The method for preparing a dumbbell according to the embodiment of the present application has at least the following beneficial effects:

[0049] The present application adopts a method of solidifying the filler first and then coating with rubber to prepare the dumbbell, which can ensure the mechanical strength of the dumbbell inner core while taking into account the drop resistance. The dumbbell has good integrity, and the dumbbell inner core and the rubber coating layer are not easy 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 the use of complex production equipment, has low cost, and is suitable for industrial production.

[0050] The present application further improves the mechanical strength of the dumbbell by solidifying the skeleton inside the mixture material, so that the dumbbell is not prone to cracking or deformation when subjected to external force impact.

[0051] In the present application, the mixed raw materials are evenly distributed in the mold through the vibration of the vibrating rod, and at the same time, bubbles in the mixed raw materials are easily discharged, so that the mixed raw materials are fully dense, and the molded mixed material is more solid and not easy to break. DETAILED DESCRIPTION

[0052] To make the purpose, technical solution and advantages of the present application clearer, the following will be further described in detail in conjunction with specific embodiments. The embodiments described here are only part of the embodiments of the present application and cannot be understood as limiting the scope of protection of the present application.

[0053] Composite aerogel particle preparation example 1

[0054] Preparation of composite aerogel particles:

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

[0056] S2. 100 g of graphene fiber was added, and then dispersed using a variable frequency high-speed disperser at a speed of 6000 rpm / min, and the dispersion time was 30 min, and the graphene fiber was dispersed by strong shear force; 10 g of silica aerogel and 10 g of ammonia solution were added, and stirring was continued for 10 min, and ultrasonic dispersion was performed to mix them evenly 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 hours to allow the gel to continue to react, the network structure to continue to coarsen and grow, and enhance the skeleton structure strength of the gel; take out the wet gel and place it in an acetone solution for replacement for 24 hours, and then immerse it in 10 times tert-butanol for solvent exchange, and repeat the exchange three times;

[0058] S4. The wet gel obtained above was directly frozen in a freeze dryer at -30°C for 4 hours, then taken out and placed in the upper layer for vacuum freeze drying, and crushed to obtain composite aerogel particles.

[0059] Composite aerogel particle preparation example 2

[0060] Preparation of composite aerogel particles:

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

[0062] S2. 100 g of graphene fiber was added, and then dispersed using a variable frequency high-speed disperser at a speed of 6000 rpm / min, and the dispersion time was 25 min, and the graphene fiber was dispersed by strong shear force; 8 g of silica aerogel and 12 g of ammonia solution were added, and stirring was continued for 10 min, and ultrasonic dispersion was performed to mix them evenly 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 hours to allow the gel to continue to react, the network structure to continue to coarsen and grow, and enhance the skeleton structure strength of the gel; take out the wet gel and place it in an acetone solution for replacement for 24 hours, and then immerse it in 10 times tert-butanol for solvent exchange, and repeat the exchange three times;

[0064] S4. The wet gel obtained above was directly frozen in a freeze dryer at -30°C for 4 hours, then taken out and placed in the upper layer for vacuum freeze drying, and crushed to obtain composite aerogel particles.

[0065] Composite aerogel particle comparative example 1

[0066] Preparation of composite aerogel particles:

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

[0068] S2. Add 10 g of silica aerogel and 10 g of ammonia solution, continue stirring for 10 min, and mix them evenly by ultrasonic dispersion 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 hours to allow the gel to continue to react, the network structure to continue to coarsen and grow, and enhance the skeleton structure strength of the gel; take out the wet gel and place it in an acetone solution for replacement for 24 hours, and then immerse it in 10 times tert-butanol for solvent exchange, and repeat the exchange three times;

[0070] S4. The wet gel obtained above was directly frozen in a freeze dryer at -30°C for 4 hours, then taken out and placed in the upper layer for vacuum freeze drying, and crushed to obtain composite aerogel particles.

[0071] Example 1

[0072] Preparation of mixed materials: Select the raw materials by weight: 30 parts of high-strength silicate cement, 15 parts of ore, 18 parts of mineral 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 Example 1, 7 parts of cut wire shot, 6 parts of iron powder, 9 parts of perlite, and 28 parts of water; wherein the mixed fiber is a mixture of graphene fiber and basalt fiber in a mass ratio of 3:2; the diameter of the mixed fiber is 10μm-1000μm; the length of the mixed fiber is 0.5cm-2cm; the wood particles are a mixture of camphor wood and oak in a weight ratio of 1:1; the average particle size of the wood particles is 5mm; the strength grade of the high-strength silicate cement is P.O52.5; the average particle size of the ore is 10mm; the average particle size of the perlite is 10mm;

[0073] A1. According to parts by weight, high-strength Portland cement, ore, ore sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, cut wire shot, iron powder, perlite and water were mixed and stirred for 10 minutes to obtain a mixed raw material;

[0074] A2. The mixed raw materials were vibrated at a frequency of 250 Hz for 3 minutes using a vibrating rod, and after 21 days of curing and watering 3 times a day, a mixed material was obtained.

[0075] Example 2

[0076] Preparation of mixed materials: Select the raw materials by weight: 20 parts of high-strength silicate cement, 10 parts of ore, 20 parts of mineral 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 Example 1, 5 parts of cut wire shot, 8 parts of iron powder, 5 parts of perlite, and 20 parts of water; wherein the mixed fiber is a mixture of graphene fiber and basalt fiber in a mass ratio of 3:1; the diameter of the mixed fiber is 10μm-1000μm; the length of the mixed fiber is 0.5cm-2cm; the wood particles are selected from elm; the average particle size of the wood particles is 6mm; the strength grade of the high-strength silicate cement is P.O52.5; the average particle size of the ore is 5mm; the average particle size of the perlite is 15mm;

[0077] A1. According to parts by weight, high-strength Portland cement, ore, ore sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, cut wire shot, iron powder, perlite and water were mixed and stirred for 10 minutes to obtain a mixed raw material;

[0078] A2. The mixed raw materials were vibrated at a frequency of 200 Hz for 4 minutes using a vibrating rod, and after 21 days of curing and watering 3 times a day, a mixed material was obtained.

[0079] Example 3

[0080] Preparation of mixed materials: Select the raw materials by weight: 40 parts of high-strength silicate cement, 20 parts of ore, 10 parts of mineral 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 Example 1 of Composite Aerogel Particle Preparation, 10 parts of cut wire shot, 3 parts of iron powder, 15 parts of perlite, and 40 parts of water; wherein the mixed fiber is a mixture of graphene fiber and basalt fiber in a mass ratio of 2:2; the diameter of the mixed fiber is 10μm-1000μm; the length of the mixed fiber is 0.5cm-2cm; the wood particles are selected from walnut wood; the average particle size of the wood particles is 3mm; the strength grade of the high-strength silicate cement is P.O52.5; the average particle size of the ore is 15mm; the average particle size of the perlite is 5mm;

[0081] A1. According to parts by weight, high-strength Portland cement, ore, ore sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, cut wire shot, iron powder, perlite and water were mixed and stirred for 10 minutes to obtain a mixed raw material;

[0082] A2. The mixed raw materials were vibrated at a frequency of 300 Hz for 2 minutes using a vibrating rod, and after 21 days of curing and watering 3 times a day, a mixture material was obtained.

[0083] Comparative Example 1

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

[0085] A1. According to parts by weight, high-strength Portland cement, ore, ore, mixed fiber, epoxy resin adhesive, wood particles, cut wire shot, iron powder, perlite and water were mixed and stirred for 10 minutes to obtain a mixed raw material;

[0086] A2. The mixed raw materials were vibrated at a frequency of 250 Hz for 3 minutes using a vibrating rod, and after 21 days of curing and watering 3 times a day, a mixed material was obtained.

[0087] Comparative Example 2

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

[0089] A1. According to parts by weight, high-strength Portland cement, ore, ore sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, cut wire shot, iron powder, perlite and water were mixed and stirred for 10 minutes to obtain a mixed raw material;

[0090] A2. The mixed raw materials were vibrated at a frequency of 250 Hz for 3 minutes using a vibrating rod, and after 21 days of curing and watering 3 times a day, a mixed material was obtained.

[0091] Comparative Example 3

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

[0094] A2. The mixed raw materials were vibrated at a frequency of 250 Hz for 3 minutes using a vibrating rod, and after 21 days of curing and watering 3 times a day, a mixed material was obtained.

[0095] Comparative Example 4

[0096] Preparation of mixed materials: Select the raw materials by weight: 30 parts of high-strength silicate cement, 15 parts of ore, 18 parts of mineral 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 Example 1, 7 parts of cut wire shot, 6 parts of iron powder, 9 parts of perlite, and 28 parts of water; wherein the mixed fiber is a mixture of graphene fiber and basalt fiber in a mass ratio of 3:2; the diameter of the mixed fiber is 10μm-1000μm; the length of the mixed fiber is 0.5cm-2cm; the wood particles are a mixture of camphor wood and oak in a weight ratio of 1:1; the average particle size of the wood particles is 5mm; the strength grade of the high-strength silicate cement is P.O52.5; the average particle size of the ore is 30mm; the average particle size of the perlite is 30mm;

[0097] A1. According to parts by weight, high-strength Portland cement, ore, ore sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, cut wire shot, iron powder, perlite and water were mixed and stirred for 10 minutes to obtain a mixed raw material;

[0098] A2. The mixed raw materials were vibrated at a frequency of 250 Hz for 3 minutes using a vibrating rod, and after 21 days of curing and watering 3 times a day, a mixed material was obtained.

[0099] Experimental example

[0100] The mixed materials prepared in Examples 1-3 and Comparative Examples 1-4 were tested for compressive strength, flexural strength, splitting tensile strength, and impact strength, respectively, and the test methods were as follows:

[0101] The compressive strength is tested according to GB / T 50081-2019;

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

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

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

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

[0106] Table 1

[0107]

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

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

[0110] The raw materials for preparing the comparative example 2 are the composite aerogel particles prepared in the comparative example 1. The raw materials for preparing the composite aerogel do not contain graphene fibers, and the rest are the same as in Example 1. The flexural strength, splitting tensile strength, impact strength and other properties of the mixture material prepared in the comparative example 2 are obviously inferior to those in Example 1 of the present application, indicating that the specific combination of the components in the composite aerogel particles in the present application is very important for improving the performance of the mixture material. The composite aerogel prepared by combining graphene, polyurethane and silica not only has good elasticity, but also can be combined with other components to further improve the folding and drop resistance of the mixture.

[0111] The raw materials for the preparation of Comparative Example 3 do not contain mixed fibers, and the rest are the same as 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 of the present application are filled into the voids in the cement slurry, and epoxy resin adhesive is added for bonding. The epoxy resin adhesive can penetrate into the tiny pores of the concrete matrix, forming mechanical bite 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 is 30 mm, the average particle size of the perlite is 30 mm, and the rest are the same as Example 1. The compressive strength, flexural strength, splitting tensile strength and impact strength of the mixture material prepared in Comparative Example 4 are all poor, indicating that a suitable particle size is essential for preparing the mixture material of the present application. If the particle size of aggregates such as ore and perlite is too large, the gaps between the large particles will be difficult to be filled with cement slurry, affecting the strength and other properties of the mixture material.

[0113] Dumbbell Preparation Example 1

[0114] Preparation of dumbbells:

[0115] (1) Welding two spherical frames and a connecting rod to make a frame; wherein the frame is made of steel bars, 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 raw materials selected in Example 1, 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 were mixed according to weight parts, and stirred for 10 minutes to obtain a mixed raw material;

[0117] (3) filling the skeleton and the mixed raw materials into a dumbbell mold, vibrating the mold at a frequency of 250 Hz for 3 minutes using a vibrating rod, curing the mold for 21 days and watering the mold 3 times a day to obtain a dumbbell core;

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

[0119] The prepared dumbbells were tested and found to be able to withstand 20,000 drops. They are strong, durable, and have good vibration reduction effects, and will not cause damage to the ground.

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

Claims

1. A mixture material, It is characterized in that The preparation comprises the following raw materials in parts by weight: 20-40 parts of high-strength Portland cement, 10-20 parts of ore, 10-20 parts of mineral 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 cut wire shot, 3-8 parts of iron powder, 5-15 parts of perlite, and 20-40 parts of water; Wherein, the hybrid fiber comprises graphene fiber and basalt fiber in a mass ratio of (2-3):(1-2); The preparation method of the composite aerogel particles comprises the following steps: S1. 50-70 g of polytetrahydrofuran, 30-40 g of toluene diisocyanate and 1-2 g of dibutyltin dilaurate are dissolved in 4-5 L of N, N-dimethylformamide, mixed evenly, reacted at a temperature of 70-90 ° C for 5-8 h, and 3-4 g of a crosslinking agent is added to obtain a polyurethane oligomer solution; S2. 90-120 g of graphene fiber was added, and then dispersed using a variable frequency high-speed disperser at a speed of 6000 rpm / min, and the dispersion time was 25-35 min, and the graphene fiber was dispersed by strong shear force; 8-12 g of silica aerogel and 8-12 g of gel catalyst solution were added, stirring was continued for 10 min, and ultrasonic dispersion was performed to mix them 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 hours to allow the gel to continue to react, the network structure to continue to coarsen and grow, and enhance the skeleton structure strength of the gel; take out the wet gel and place it in an acetone solution for replacement for 24 hours, and then immerse it in 10 times tert-butanol for solvent exchange, and repeat the exchange three times; S4. The wet gel obtained above was directly frozen in a freeze dryer at -30°C for 4 hours, then taken out and placed in the upper layer for vacuum freeze drying, and crushed to obtain composite aerogel particles.

2. A mixture material according to claim 1, It is characterized in that The cross-linking agent in step S1 is 1,3,5-tris(4-aminophenoxy)benzene.

3. A mixture material according to claim 1, It is characterized in that The diameter of the mixed fiber is 10 μm-1000 μm, and / or the length of the mixed fiber is 0.5 cm-2 cm.

4. A mixture material according to claim 1, It is characterized in that The wood particles are selected from at least one of ash, beech, camphor, walnut, oak, birch, fir, elm and red wood, and / or the average particle size of the wood particles is 3-6 mm.

5. A mixture material according to claim 1, It is characterized in that The average particle size of the ore is 5-15 mm, and / or the average particle size of the perlite is 5-15 mm.

6. A mixture material according to claim 1, It is characterized in that The preparation method of the mixture material comprises the following steps: A1. According to parts by weight, high-strength Portland cement, ore, ore sand, mixed fiber, epoxy resin adhesive, wood particles, composite aerogel particles, cut wire shot, iron powder, perlite and water were mixed and stirred for 10 minutes to obtain a mixed raw material; A2. The mixed raw materials were vibrated 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, a mixture material was obtained.

7. A dumbbell comprising the mixture material according to any one of claims 1 to 6, It is characterized in that The dumbbell comprises a frame and a rubber coating layer.

8. The dumbbell according to claim 6, It is characterized in that 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.

9. The dumbbell according to claim 8, It is characterized in that The material of the rubber coating is selected from one of synthetic rubber, rubber particles and rubber plastic.

10. A method for preparing a dumbbell as claimed in claim 9, It is characterized in that The following steps are involved: (1) connecting the two spherical frames and the connecting rod to form 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) filling the skeleton and the mixed raw materials into a dumbbell mold, vibrating the mold at a frequency of 200-300 Hz for 2-4 minutes using a vibrating rod, curing the mold for 21 days, watering the mold 3 times a day, and obtaining a dumbbell core; (4) Using a rubber coating 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.

Images