CN111018405B - Steel-polypropylene fiber artificial granite composite material added with foam particles and preparation method thereof - Google Patents

Abstract

The invention discloses a steel-polypropylene fiber reinforced artificial granite composite material added with foam particles and a preparation method thereof. Weighing the composite binder and the filler according to the proportion requirement, and mixing the filler and the composite binder to obtain a mixture 2. And uniformly stirring the mixture 1 and the mixture 2 by using a stirrer, injecting the mixture into a steel mold coated with a release agent, fixing the steel mold on a vibration table, vibrating and compacting for molding, and curing at room temperature after demolding to obtain a finished product. The multi-phase interface of the composite material can be increased by adding the foam particles, and the intrinsic property of the foam particles has high damping, so that the energy generated by vibration can be effectively consumed, and the vibration resistance of the material is improved; the mechanical property and the vibration resistance of the material can be simultaneously improved by adding the steel fiber and the polypropylene fiber.

Description

Steel-polypropylene fiber artificial granite composite material with foam particles and its preparation preparation method

technical field

The invention belongs to the technical field of composite materials, and in particular relates to a steel-polypropylene fiber reinforced artificial granite composite material added with foam particles and a preparation method thereof.

Background technique

The manufacturing industry is a country's basic industry, which reflects the country's comprehensive strength. The world's cutting-edge technology manufacturing industry is inseparable from precision and ultra-precision machine tools, and the performance of the machine tool bed, the core basic part of the machine tool, determines the machining accuracy of the machine tool. The anti-vibration performance of the traditional cast iron material as an ultra-precision machine tool bed is insufficient, and the cast iron bed produces a large amount of exhaust gas and waste slag during the casting process, and the energy consumption is serious. In response to this problem, experts explored the use of natural granite as the bed of ultra-precision machine tools, but natural granite deforms when it is wet, which affects the processing accuracy, and the country has imposed certain restrictions on the mining of natural granite.

In recent years, artificial granite has been recognized by experts as the bed of ultra-precision machine tools. Kobaisi M A et al. studied the application of resin concrete with different aggregates in machine tools and tested its performance. The experimental results showed that the thermal expansion coefficient of resin concrete was low; Yu Yinghua et al. After analyzing the factors and heat sources of thermal deformation, the thermal deformation coefficient of the steel fiber polymer concrete machine tool foundation was tested, and compared with the cast iron machine tool foundation, the results showed that the thermal deformation of the steel fiber polymer concrete material was higher than that of the cast iron material Half of that; Ding Jiangmin and others used the temperature test system developed by LabVIEW to measure the temperature distribution of the concrete bed, and compared it with the prototype cast iron bed, and found that the resin concrete bed has more stable thermal performance; Sun Jie et al. The amplitude attenuation curve of the resin concrete material was tested by free vibration to determine the damping characteristics of the material, and compared with the vibration attenuation curve of gray cast iron, the results showed that the logarithmic attenuation rate of resin concrete was much greater than that of gray cast iron; Chen Kun et al. The bed of two different materials, granite and cast iron, is used as the research object on the high-speed lathe. The dynamic modes of the bed during cutting are compared and analyzed: the mode frequency of the artificial granite bed is much higher than that of the cast iron bed, and the artificial granite The density is only equivalent to 1/3 of the cast iron material. It can be concluded that the mass stiffness and seismic performance of the artificial granite bed are much higher than that of the cast iron bed. Resin concrete as an ultra-precision machine bed not only improves the vibration resistance and corrosion resistance of the machine tool, but also reduces casting energy consumption and environmental pollution. Well-known artificial granite bed manufacturers at home and abroad, such as Stuter in Switzerland, Hardinge in the United States, Emag in Germany, Jinan Nano Precision Machinery Co., Ltd., etc., but the mechanical properties of the bed made of artificial granite materials are insufficient. The anti-vibration performance can still be further improved.

The addition of steel-polypropylene fibers can greatly enhance the mechanical properties of artificial granite. Steel fibers and polypropylene fibers effectively inhibit the cracking of the artificial granite matrix and increase the threshold of matrix cracks. In order to increase material damping, it is creative to add foam particles to resin concrete. The cost of foam particles is low, and the damping effect is obvious. It has a good application prospect when added to resin concrete ultra-precision machine bed materials. The mechanism of damping increase It is because part of the energy generated by vibration is consumed when it passes through the resin foam particle interface, resin aggregate interface, and resin fiber interface, and part of the energy can be consumed by the foam particles themselves. Adding foam particles effectively increases the steel-polypropylene fiber reinforced artificial granite material. anti-vibration performance. Under the general background of the development of the manufacturing industry, the present invention aims to design a high-vibration-resistant, high-strength ultra-precision machine tool new composite material bed, which is of great help to the machining accuracy of the ultra-precision machine tool.

Contents of the invention

In view of the deficiencies of the above background technology, the present invention provides a steel-polypropylene fiber reinforced artificial granite composite material with added foam particles and its preparation method, by adding hybrid fibers (steel fibers and polypropylene fibers) and foam particles to solve the problem. At present, the lack of mechanical properties and anti-vibration performance of the ultra-precision machine tool bed improves the machining performance of ultra-precision machine tools.

In order to solve the above problems, the present invention adopts the following technical solutions:

A steel-polypropylene fiber-reinforced artificial granite composite material with added foam particles, including aggregates, composite binders, steel-polypropylene fibers, fillers, and foam particles; wherein the aggregates account for 80% of the total mass of the composite material, and the composite The binder accounts for 13.2% of the total mass of the composite material, the steel-polypropylene fiber accounts for 1.1%-1.3% of the total mass of the composite material, the filler accounts for 5.5% of the total mass of the composite material, and the foam particles account for 0.07%- 0.13%.

The aggregates are Jinan blue granite aggregates of different sizes, and the aggregates are divided into 5 grades according to the particle size of the aggregates. The grading of the aggregates of the 5 grades is as follows: Accounting for 13.75% of the total mass of the aggregate system; aggregates with a particle size of 0.11mm to 0.52mm accounted for 13.48% of the total mass of the aggregate system; aggregates with a particle size of 0.52mm to 2.36mm accounted for 25.75% of the total mass of the aggregate system %; aggregates with a particle size of 2.36mm to 4.75mm accounted for 19.09% of the total mass of the aggregate system; aggregates with a particle size of 4.75mm to 10.00mm accounted for 27.93% of the total mass of the aggregate system.

The composite binder is a mixture of binder, curing agent and diluent, wherein the binder is epoxy resin E44, accounting for 57.69% of the total mass of the composite binder; the curing agent is 650 polyamide resin, accounting for 26.92% of the total mass of the binder; the diluent is C12-14 alkyl glycidyl ether, accounting for 15.39% of the total mass of the binder.

The steel-polypropylene fiber is a mixture of steel fiber and polypropylene fiber, wherein the steel fiber is copper-coated steel fiber with a diameter of 500 μm and an aspect ratio of 50-70; the polypropylene fiber has a diameter of 35 μm and a length of 12mm or 19mm, the ratio of steel fiber to polypropylene fiber content is (26-32):1.

The filler is a mixture of magnesium sulfate and mica powder, wherein the magnesium sulfate has a particle size of 60 mesh and a content greater than 99%; the mica powder has a particle size of 1250 mesh and a moisture content of less than 0.1%, and the content ratio of magnesium sulfate to mica powder is 1:2.

The particle size of the foam particles is 2 mm.

The preparation method of the steel-polypropylene fiber artificial granite composite material added with foam particles, the steps are as follows:

① Wash the aggregates, crush and dry them, screen the dried aggregates according to the particle size, and weigh the aggregate content of the required particle size according to the aggregate gradation requirements;

② Carry out surface pretreatment to steel fiber, weigh the content of steel fiber and polypropylene fiber according to the mix ratio of mixed fiber;

③Weigh the foam particles according to the proportion;

④ Mix ①②③ and stir evenly;

⑤ Weigh the epoxy resin binder, curing agent and diluent according to the proportion, mix and stir evenly;

⑥ Weigh the filler according to the ratio requirements;

⑦ Mix ⑤ ⑥ and stir evenly;

⑧Mix ④⑦ and stir evenly;

⑨The stirred composite material is cast into a mold coated with a release agent, and vibrated by a vibrating table;

⑩After demoulding, curing at room temperature, and curing, the test piece was obtained.

The pretreatment method in the step ② is: mix KH-550 and ethanol in proportion, the mass fraction of KH-550 after mixing is 5%, adjust the pH value of the mixed solution to 4 with acetic acid solution, wash and dry The finished steel fibers were put into a mixed solution with a pH value of 4, heated to 60° C. in a water bath, kept at a constant temperature and stirred for 1 hour. Wash with distilled water and ethanol and dry.

In the step ⑨, the rotation speed of the mixer is 45r/min, the stirring time is 5min, the vibration frequency of the vibration table is 100HZ-125HZ, the amplitude is 0.25mm-0.8mm, and the vibration time is 1h.

Beneficial effects of the present invention: the anti-vibration performance of the artificial granite composite material without adding foam particles is low, the mechanical properties of artificial granite without adding fibers are low, and the anti-vibration performance of the artificial granite composite material with foam particles and steel-polypropylene fibers is as good as The mechanical properties are significantly enhanced. For example, adding foam particles can increase the multiphase interface of the composite material. The foam particles have high damping intrinsically, which can effectively consume the energy generated by vibration and improve the vibration resistance of the material; adding steel fibers can improve the compression and bending resistance of the material. Strength and modulus of elasticity; adding polypropylene fibers can improve the splitting tensile properties of the material and increase the cracking threshold of the material; adding a single fiber can also improve the mechanical properties of the material, but it is not obvious. Therefore, combining the advantages of the two fibers and adding foam particles can simultaneously improve the mechanical properties and anti-vibration properties of the material.

Compared with the artificial granite composite material without adding steel-polypropylene fiber, the preparation method of the present invention adopts the steel-polypropylene fiber reinforced artificial granite composite material with added foam particles, the compressive strength of the material increases by 19% to 33%, and the bending resistance Strength increased by 21% to 43%. The prepared steel-polypropylene fiber-reinforced artificial granite composite material with added foam particles increased the compressive strength by 10%-23% and the flexural strength increased by 13%-33% compared with the artificial granite composite material added with single steel fiber; The steel-polypropylene fiber-reinforced artificial granite composite material added with foam particles increased the compressive strength by 14%-28% and the flexural strength increased by 10%-29% compared with the artificial granite composite material added single polypropylene fiber; Compared with the steel-polypropylene fiber reinforced artificial granite composite without foam particles, the damping of the steel-polypropylene fiber reinforced artificial granite composite material with foam particles increased by 8% to 21%.

detailed description

The present invention will be further described below in conjunction with specific embodiments. It should be understood that the following examples are only used to illustrate the present invention rather than limit the scope of the present invention, and those skilled in the art may make some non-essential improvements and adjustments based on the content of the above invention.

Example 1

The preparation method of the steel-polypropylene fiber reinforced artificial granite composite material added with foam particles in this embodiment is as follows:

(1) Clean the aggregate, crush it, and dry it. Sieve the dried aggregate according to the particle size, weigh the aggregate content of the required particle size according to the aggregate gradation requirements and stir evenly; 10kg of Jinan blue granite aggregate, of which:

The aggregate of 0.00mm～0.11mm is 1375g, accounting for 13.75% of the total mass of the aggregate;

The aggregate of 0.11mm to 0.52mm is 1348g, accounting for 13.48% of the total mass of the aggregate;

The aggregate of 0.52mm-2.36mm is 2575g, accounting for 25.75% of the total mass of the aggregate;

The aggregate of 2.36mm-4.75mm is 1909g, accounting for 19.09% of the total aggregate mass;

The aggregate of 4.75mm to 10.00mm is 2793g, accounting for 27.93% of the total mass of the aggregate.

(2) Weigh 145g of steel fiber, soak and clean the dried steel fiber with KH-550 solution with PH value of 4 mass fraction and 5%, heat it in water bath to 60°C, keep constant temperature and stir for 1 hour, then wash with distilled water and ethanol and dry.

Weigh 5 g of polypropylene fiber.

(3) Weigh 1650g of the binder system according to the ratio requirements, of which:

Epoxy resin E44 is 952g, accounting for 57.69% of the total mass of the binder system;

650 polyamide resin is 444g, accounting for 26.92% of the total mass of the binder system;

C12-14 alkyl glycidyl ether is 254g, accounting for 15.39% of the total mass of the binder system.

(4) Weigh 687.5g of filler according to the ratio requirements, including: 229g of magnesium sulfate and 458.5g of mica powder.

(5) Weigh 9g of foam particles according to the ratio requirements.

(6) Mix the filler and the composite binder evenly and add it to the mixture of the aggregate system, the steel-polypropylene fiber and the foam particles, pour it into the mixer and stir evenly, the speed of the mixer is 45r/min, and stir The time is 5 minutes. Inject the uniformly stirred composite material into a mold coated with a release agent, fix the mold on a vibrating table and vibrate compactly. The vibration frequency of the vibrating table is 100Hz-125Hz, the amplitude is 0.25mm-0.8mm, and the vibration time is 1h.

(7) Curing at room temperature for 24 hours after demoulding, and curing for 10 days to form a finished product.

Through the above preparation method and aggregate ratio, the steel-polypropylene fiber-reinforced artificial granite with added foam particles has a maximum compressive strength of 159.2MPa, a maximum flexural strength of 39.5MPa, and a damping coefficient of 1.08%.

Example 2

The preparation method of the steel-polypropylene fiber reinforced artificial granite composite material added with foam particles in this embodiment is as follows:

(1) Clean the aggregate, crush it, and dry it. Sieve the dried aggregate according to the particle size, weigh the aggregate content of the required particle size according to the aggregate gradation requirements and stir evenly; 10kg of Jinan blue granite aggregate, of which:

The aggregate of 0.00mm～0.11mm is 1375g, accounting for 13.75% of the total mass of the aggregate;

The aggregate of 0.11mm to 0.52mm is 1348g, accounting for 13.48% of the total mass of the aggregate;

The aggregate of 0.52mm-2.36mm is 2575g, accounting for 25.75% of the total mass of the aggregate;

The aggregate of 2.36mm-4.75mm is 1909g, accounting for 19.09% of the total aggregate mass;

The aggregate of 4.75mm to 10.00mm is 2793g, accounting for 27.93% of the total mass of the aggregate.

(2) Weigh 145g of steel fiber, soak and clean the dried steel fiber with KH-550 solution with PH value of 4 mass fraction and 5%, heat it in water bath to 60°C, keep constant temperature and stir for 1 hour, then wash with distilled water and ethanol and dry.

Weigh 5 g of polypropylene fiber.

(3) Weigh 1650g of composite binder according to the ratio requirements, of which:

Epoxy resin E44 is 952g, accounting for 57.69% of the total mass of the composite binder;

650 polyamide resin is 444g, accounting for 26.92% of the total mass of the composite binder;

C12-14 alkyl glycidyl ether is 254g, accounting for 15.39% of the total mass of the composite binder.

(4) Weigh 687.5g of filler according to the ratio requirements, including: 229g of magnesium sulfate and 458.5g of mica powder.

(5) Weigh 12.5g of foam particles according to the ratio requirements.

(6) Mix the filler and the composite binder evenly and add it to the mixture of the aggregate system, the steel-polypropylene fiber and the foam particles, pour it into the mixer and stir evenly, the speed of the mixer is 45r/min, and stir The time is 5 minutes. Inject the uniformly stirred composite material into a mold coated with a release agent, fix the mold on a vibrating table and vibrate compactly. The vibration frequency of the vibrating table is 100Hz-125Hz, the amplitude is 0.25mm-0.8mm, and the vibration time is 1h.

(7) Curing at room temperature for 24 hours after demoulding, and curing for 10 days to form a finished product.

Through the above preparation method and aggregate ratio, the steel-polypropylene fiber reinforced artificial granite with added foam particles has a compressive strength of up to 160MPa, a flexural strength of up to 40MPa, and a damping coefficient of 1.19%.

Example 3

The preparation method of the steel-polypropylene fiber reinforced artificial granite composite material added with foam particles in this embodiment is as follows:

(1) Clean the aggregate, crush it, and dry it. Sieve the dried aggregate according to the particle size, weigh the aggregate content of the required particle size according to the aggregate gradation requirements and stir evenly; 10kg of Jinan blue granite aggregate, of which:

The aggregate of 0.00mm～0.11mm is 1375g, accounting for 13.75% of the total mass of the aggregate;

The aggregate of 0.11mm to 0.52mm is 1348g, accounting for 13.48% of the total mass of the aggregate;

The aggregate of 0.52mm-2.36mm is 2575g, accounting for 25.75% of the total mass of the aggregate;

The aggregate of 2.36mm-4.75mm is 1909g, accounting for 19.09% of the total aggregate mass;

The aggregate of 4.75mm to 10.00mm is 2793g, accounting for 27.93% of the total mass of the aggregate.

(2) Weigh 145g of steel fiber, soak and clean the dried steel fiber with KH-550 solution with PH value of 4 mass fraction and 5%, heat it in water bath to 60°C, keep constant temperature and stir for 1 hour, then wash with distilled water and ethanol and dry.

Weigh 5 g of polypropylene fiber.

(3) Weigh 1650g of composite binder according to the ratio requirements, of which:

Epoxy resin E44 is 952g, accounting for 57.69% of the total mass of the composite binder;

650 polyamide resin is 444g, accounting for 26.92% of the total mass of the composite binder;

C12-14 alkyl glycidyl ether is 254g, accounting for 15.39% of the total mass of the composite binder.

(4) Weigh 687.5g of filler according to the ratio requirements, including: 229g of magnesium sulfate and 458.5g of mica powder.

(5) Weigh 16g of foam particles according to the ratio requirements.

(6) Mix the filler and the composite binder evenly and add it to the mixture of the aggregate system, the steel-polypropylene fiber and the foam particles, pour it into the mixer and stir evenly, the speed of the mixer is 45r/min, and stir The time is 5 minutes. Inject the uniformly stirred composite material into a mold coated with a release agent, fix the mold on a vibrating table and vibrate compactly. The vibration frequency of the vibrating table is 100Hz-125Hz, the amplitude is 0.25mm-0.8mm, and the vibration time is 1h.

(7) Curing at room temperature for 24 hours after demoulding, and curing for 10 days to form a finished product.

Through the above preparation method and aggregate ratio, the steel-polypropylene fiber-reinforced artificial granite with added foam particles has a maximum compressive strength of 158.8MPa, a maximum flexural strength of 39.8MPa, and a damping coefficient of 1.21%.

Comparative example 1

(1) Clean the aggregate, crush it, and dry it. Sieve the dried aggregate according to the particle size, weigh the aggregate content of the required particle size according to the aggregate gradation requirements and stir evenly; 10kg of Jinan blue granite aggregate, of which:

The aggregate of 0.00mm～0.11mm is 1375g, accounting for 13.75% of the total mass of the aggregate;

The aggregate of 0.11mm to 0.52mm is 1348g, accounting for 13.48% of the total mass of the aggregate;

The aggregate of 0.52mm-2.36mm is 2575g, accounting for 25.75% of the total mass of the aggregate;

The aggregate of 2.36mm-4.75mm is 1909g, accounting for 19.09% of the total aggregate mass;

The aggregate of 4.75mm to 10.00mm is 2793g, accounting for 27.93% of the total mass of the aggregate.

(2) Weigh 145g of steel fiber according to the ratio requirements, soak and clean the dried steel fiber with KH-550 solution with a pH value of 4 and 5% by mass fraction, heat it in a water bath to 60°C, keep constant temperature and stir for 1 hour before use Wash with distilled water and ethanol and dry.

(3) Weigh 1650g of composite binder according to the ratio requirements, of which:

Epoxy resin E44 is 952g, accounting for 57.69% of the total mass of the composite binder;

650 polyamide resin is 444g, accounting for 26.92% of the total mass of the composite binder;

C12-14 alkyl glycidyl ether is 254g, accounting for 15.39% of the total mass of the composite binder.

(4) Weigh 687.5g of filler according to the ratio requirements, including: 229g of magnesium sulfate and 458.5g of mica powder.

(5) Weigh 12.5g of foam particles according to the ratio requirements.

(6) Mix the filler and the composite binder evenly and add it to the mixture of the aggregate system, steel fiber and foam particles, pour it into the mixer and stir evenly, the speed of the mixer is 45r/min, and the mixing time is 5min . Inject the uniformly stirred composite material into a mold coated with a release agent, fix the mold on a vibrating table and vibrate compactly. The vibration frequency of the vibrating table is 100Hz-125Hz, the amplitude is 0.25mm-0.8mm, and the vibration time is 1h.

(7) Curing at room temperature for 24 hours after demoulding, and curing for 10 days to form a finished product.

Through the above preparation method and aggregate ratio, the steel fiber reinforced artificial granite with added foam particles has a maximum compressive strength of 130MPa, a maximum flexural strength of 30MPa, and a damping coefficient of 1.185%.

Comparing Comparative Example 1 with Example 2 without adding polypropylene fibers, the results show that the compressive strength is reduced by 30 MPa, the flexural strength is reduced by 10 MPa, and the damping coefficient is basically unchanged.

Comparative example 2

(1) Clean the aggregate, crush it, and dry it. Sieve the dried aggregate according to the particle size, weigh the aggregate content of the required particle size according to the aggregate gradation requirements and stir evenly; 10kg of Jinan blue granite aggregate, of which:

The aggregate of 0.00mm～0.11mm is 1375g, accounting for 13.75% of the total mass of the aggregate;

The aggregate of 0.11mm to 0.52mm is 1348g, accounting for 13.48% of the total mass of the aggregate;

The aggregate of 0.52mm-2.36mm is 2575g, accounting for 25.75% of the total mass of the aggregate;

The aggregate of 2.36mm-4.75mm is 1909g, accounting for 19.09% of the total aggregate mass;

The aggregate of 4.75mm to 10.00mm is 2793g, accounting for 27.93% of the total mass of the aggregate.

(2) Weigh 5g of polypropylene fiber according to the ratio requirements;

(3) Weigh 1650g of composite binder according to the ratio requirements, of which:

Epoxy resin E44 is 952g, accounting for 57.69% of the total mass of the composite binder;

650 polyamide resin is 444g, accounting for 26.92% of the total mass of the composite binder;

C12-14 alkyl glycidyl ether is 254g, accounting for 15.39% of the total mass of the composite binder.

(4) Weigh 687.5g of filler according to the ratio requirements, including: 229g of magnesium sulfate and 458.5g of mica powder.

(5) Weigh 12.5g of foam particles according to the ratio requirements.

(6) Mix the filler and the composite binder evenly and add it to the mixture of the aggregate system, polypropylene fiber and foam particles, pour it into the mixer and stir evenly, the speed of the mixer is 45r/min, and the mixing time is 5min. Inject the uniformly stirred composite material into a mold coated with a release agent, fix the mold on a vibrating table and vibrate compactly. The vibration frequency of the vibrating table is 100Hz-125Hz, the amplitude is 0.25mm-0.8mm, and the vibration time is 1h.

(7) Curing at room temperature for 24 hours after demoulding, and curing for 10 days to form a finished product.

Through the above preparation method and aggregate ratio, the polypropylene fiber reinforced artificial granite with added foam particles has a maximum compressive strength of 125MPa, a maximum flexural strength of 31MPa, and a damping coefficient of 1.182%.

Comparing Comparative Example 2 with Example 2 without adding steel fibers, the results show that the compressive strength is reduced by 35 MPa, the flexural strength is reduced by 9 MPa, and the damping coefficient is basically unchanged.

Comparative example 3

(1) Clean the aggregate, crush it, and dry it. Sieve the dried aggregate according to the particle size, weigh the aggregate content of the required particle size according to the aggregate gradation requirements and stir evenly; 10kg of Jinan blue granite aggregate, of which:

The aggregate of 0.00mm～0.11mm is 1375g, accounting for 13.75% of the total mass of the aggregate system;

The aggregate of 0.11mm to 0.52mm is 1348g, accounting for 13.48% of the total mass of the aggregate system;

The aggregate of 0.52mm-2.36mm is 2575g, accounting for 25.75% of the total mass of the aggregate system;

The aggregate of 2.36mm-4.75mm is 1909g, accounting for 19.09% of the total mass of the aggregate system;

The aggregate of 4.75mm to 10.00mm is 2793g, accounting for 27.93% of the total mass of the aggregate system.

(2) Weigh 1650g of the binder system according to the ratio requirements, of which:

Epoxy resin E44 is 952g, accounting for 57.69% of the total mass of the binder system;

650 polyamide resin is 444g, accounting for 26.92% of the total mass of the binder system;

C12-14 alkyl glycidyl ether is 254g, accounting for 15.39% of the total mass of the binder system.

(3) Weigh 687.5g of filler according to the ratio requirements, including: 229g of magnesium sulfate and 458.5g of mica powder.

(4) Weigh 12.5g of foam particles according to the ratio requirements.

(5) Mix the filler system and the binder system evenly, add them to the mixture of the aggregate system and foam particles, pour into the mixer and stir evenly. The speed of the mixer is 45r/min, and the mixing time is 5min. Inject the uniformly stirred composite material into a mold coated with a release agent, fix the mold on a vibrating table and vibrate compactly. The vibration frequency of the vibrating table is 100Hz-125Hz, the amplitude is 0.25mm-0.8mm, and the vibration time is 1h.

(6) Curing at room temperature for 24 hours after demoulding, and curing for 10 days to form a finished product.

Through the above-mentioned preparation method and aggregate proportioning, the compressive strength of the composite material can reach up to 120MPa, the flexural strength can reach up to 28MPa, and the damping coefficient can reach 1.178%.

Comparative Example 3 is compared with Example 2 without adding steel fiber and polypropylene fiber, and the result is that the compressive strength is reduced by 40 MPa, the bending strength is reduced by 12 MPa, and the damping coefficient is basically unchanged.

Comparative example 4

(1) Clean the aggregate, crush it, and dry it. Sieve the dried aggregate according to the particle size, weigh the aggregate content of the required particle size according to the aggregate gradation requirements and stir evenly; 10kg of Jinan blue granite aggregate, of which:

The aggregate of 0.00mm～0.11mm is 1375g, accounting for 13.75% of the total mass of the aggregate system;

The aggregate of 0.11mm to 0.52mm is 1348g, accounting for 13.48% of the total mass of the aggregate system;

The aggregate of 0.52mm-2.36mm is 2575g, accounting for 25.75% of the total mass of the aggregate system;

The aggregate of 2.36mm-4.75mm is 1909g, accounting for 19.09% of the total mass of the aggregate system;

The aggregate of 4.75mm to 10.00mm is 2793g, accounting for 27.93% of the total mass of the aggregate system.

(2) Weigh 130g of steel fiber according to the ratio requirements, soak and clean the dried steel fiber with KH-550 solution with a pH value of 4 and 5% by mass fraction, heat it in a water bath to 60°C, keep constant temperature and stir for 1 hour before use Wash with distilled water and ethanol and dry.

(3) Weigh 5g of polypropylene fiber according to the ratio requirement.

(4) Weigh 1650g of the binder system according to the ratio requirements, of which:

Epoxy resin E44 is 952g, accounting for 57.69% of the total mass of the binder system;

650 polyamide resin is 444g, accounting for 26.92% of the total mass of the binder system;

C12-14 alkyl glycidyl ether is 254g, accounting for 15.39% of the total mass of the binder system.

(5) Weigh 687.5g of filler according to the ratio requirements, including: 229g of magnesium sulfate and 458.5g of mica powder.

(6) Weigh 12.5g of foam particles according to the ratio requirements.

(7) Mix the filler system and the binder system evenly and then add it to the mixture of the aggregate system, steel-polypropylene fiber and foam particles, and pour it into the mixer and stir evenly. The speed of the mixer is 45r/min. Stirring time is 5min. Inject the uniformly stirred composite material into a mold coated with a release agent, fix the mold on a vibrating table and vibrate compactly. The vibration frequency of the vibrating table is 100Hz-125Hz, the amplitude is 0.25mm-0.8mm, and the vibration time is 1h.

(7) Curing at room temperature for 24 hours after demoulding, and curing for 10 days to form a finished product.

The steel-polypropylene fiber-reinforced artificial granite obtained through the above preparation method and aggregate ratio has a maximum compressive strength of 143MPa, a maximum flexural strength of 34MPa, and a damping coefficient of 1.188%.

Compared with Example 2, the steel fiber added in Comparative Example 4 was reduced from 145g to 130g. As a result, the compressive strength was reduced by 17Mpa, the bending strength was reduced by 6MPa, and the damping coefficient was basically unchanged.

Comparative example 5

(1) Clean the aggregate, crush it, and dry it. Sieve the dried aggregate according to the particle size, weigh the aggregate content of the required particle size according to the aggregate gradation requirements and stir evenly; 10kg of Jinan blue granite aggregate, of which:

The aggregate of 0.00mm～0.11mm is 1375g, accounting for 13.75% of the total mass of the aggregate system;

The aggregate of 0.11mm to 0.52mm is 1348g, accounting for 13.48% of the total mass of the aggregate system;

The aggregate of 0.52mm-2.36mm is 2575g, accounting for 25.75% of the total mass of the aggregate system;

The aggregate of 2.36mm-4.75mm is 1909g, accounting for 19.09% of the total mass of the aggregate system;

The aggregate of 4.75mm to 10.00mm is 2793g, accounting for 27.93% of the total mass of the aggregate system.

(3) Weigh 160g of steel fiber according to the ratio requirements, soak and clean the dried steel fiber with KH-550 solution with a pH value of 4 and 5% by mass fraction, heat it in a water bath to 60°C, keep constant temperature and stir for 1 hour before use Wash with distilled water and ethanol and dry.

(3) Weigh 5g of polypropylene fiber according to the ratio requirements.

(4) Weigh 1650g of the binder system according to the ratio requirements, of which:

Epoxy resin E44 is 952g, accounting for 57.69% of the total mass of the binder system;

650 polyamide resin is 444g, accounting for 26.92% of the total mass of the binder system;

C12-14 alkyl glycidyl ether is 254g, accounting for 15.39% of the total mass of the binder system.

(5) Weigh 687.5g of filler according to the ratio requirements, including: 229g of magnesium sulfate and 458.5g of mica powder.

(6) Weigh 12.5g of foam particles according to the ratio requirements.

(7) Mix the filler system and the binder system evenly and then add it to the mixture of the aggregate system, steel-polypropylene fiber and foam particles, and pour it into the mixer and stir evenly. The speed of the mixer is 45r/min. Stirring time is 5min. Inject the uniformly stirred composite material into a mold coated with a release agent, fix the mold on a vibrating table and vibrate compactly. The vibration frequency of the vibrating table is 100Hz-125Hz, the amplitude is 0.25mm-0.8mm, and the vibration time is 1h.

(7) Curing at room temperature for 24 hours after demoulding, and curing for 10 days to form a finished product.

The compressive strength of the steel-polypropylene fiber reinforced artificial granite obtained through the above preparation method and aggregate ratio can reach up to 151MPa, the flexural strength can reach up to 38MPa, and the damping coefficient can reach 1.189%.

Comparing Example 5 and Example 2, the added steel fiber was increased from 145g to 160g, and other conditions were unchanged, the compressive strength was reduced by 9Mpa, the flexural strength was reduced by 2MPa, and the damping coefficient was basically unchanged.

Comparative example 6

(1) Clean the aggregate, crush it, and dry it. Sieve the dried aggregate according to the particle size, weigh the aggregate content of the required particle size according to the aggregate gradation requirements and stir evenly; 10kg of Jinan blue granite aggregate, of which:

The aggregate of 0.00mm～0.11mm is 1375g, accounting for 13.75% of the total mass of the aggregate;

The aggregate of 0.11mm to 0.52mm is 1348g, accounting for 13.48% of the total mass of the aggregate;

The aggregate of 0.52mm-2.36mm is 2575g, accounting for 25.75% of the total mass of the aggregate;

The aggregate of 2.36mm-4.75mm is 1909g, accounting for 19.09% of the total aggregate mass;

The aggregate of 4.75mm to 10.00mm is 2793g, accounting for 27.93% of the total mass of the aggregate.

(2) Weigh 145g of steel fiber, soak and clean the dried steel fiber with KH-550 solution with PH value of 4 mass fraction and 5%, heat it in water bath to 60°C, keep constant temperature and stir for 1 hour, then wash with distilled water and ethanol and dry.

Weigh 5 g of polypropylene fiber.

(3) Weigh 1650g of composite binder according to the ratio requirements, of which:

Epoxy resin E44 is 952g, accounting for 57.69% of the total mass of the composite binder;

650 polyamide resin is 444g, accounting for 26.92% of the total mass of the composite binder;

C12-14 alkyl glycidyl ether is 254g, accounting for 15.39% of the total mass of the composite binder.

(4) Weigh 687.5g of filler according to the ratio requirements, including: 229g of magnesium sulfate and 458.5g of mica powder.

(5) Mix the filler and the composite binder evenly and add it to the mixture of the aggregate system and the steel-polypropylene fiber, pour it into the mixer and stir evenly, the speed of the mixer is 45r/min, and the mixing time is 5min . Inject the uniformly stirred composite material into a mold coated with a release agent, fix the mold on a vibrating table and vibrate compactly. The vibration frequency of the vibrating table is 100Hz-125Hz, the amplitude is 0.25mm-0.8mm, and the vibration time is 1h.

(6) Curing at room temperature for 24 hours after demoulding, and curing for 10 days to form a finished product.

Through the above preparation method and aggregate ratio, the steel-polypropylene fiber-reinforced artificial granite with added foam particles has a maximum compressive strength of 158.6MPa, a maximum flexural strength of 39MPa, and a damping coefficient of 0.1%.

Comparing Comparative Example 6 with Example 2 without adding foam particles, the results show that the compressive strength and flexural strength are basically unchanged, and the damping coefficient is reduced by 16%.

The above comparative examples are all compared with Example 2. Comparative Example 1 does not add polypropylene fibers, and the composite material compressive and flexural properties decrease; Comparative Example 2 does not add steel fibers, and the composite material compressive and flexural properties decrease; Comparative Example 3 Both kinds of fibers are not added, and the composite material's compressive and flexural properties are reduced; the content of steel fiber added in comparative example 4 is reduced from 145g to 130g, and the composite material's compressive and flexural properties are reduced; the content of steel fiber added in comparative example 5 is reduced by 145g increased to 160g, the compressive and bending properties of the composite material decreased; in Comparative Example 6, no foam particles were added, and the damping properties decreased.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and what are described in the above-mentioned embodiments and description are only the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention also has various All changes and improvements fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (5)

1. A steel-polypropylene fiber artificial granite composite material that adds foam particles is characterized in that: it is made up of aggregate, composite binder, steel-polypropylene fiber, filler, foam particles; wherein aggregate accounts for the total amount of composite material 80% of the mass of the composite material, the composite binder accounts for 13.2% of the total mass of the composite material, the steel-polypropylene fiber accounts for 1.1% to 1.3% of the total mass of the composite material, the filler accounts for 5.5% of the total mass of the composite material, and the foam particles account for 0.07% to 0.13% of the total mass; the particle size of the foam particles is 2mm; The aggregates are Jinan blue granite aggregates of different sizes, and the aggregates are divided into 5 grades according to the particle size of the aggregates. The grading of the aggregates of the 5 grades is as follows: Accounting for 13.75% of the total mass of aggregates; aggregates with a particle size of 0.11mm to 0.52mm accounted for 13.48% of the total mass of aggregates; aggregates with a particle size of 0.52mm to 2.36mm accounted for 25.75% of the total mass of aggregates; Aggregate with a diameter of 2.36mm to 4.75mm accounted for 19.09% of the total aggregate mass; aggregates with a particle diameter of 4.75mm to 10.00mm accounted for 27.93% of the total aggregate mass; The composite binder is a mixture of binder, curing agent and diluent, wherein the binder is epoxy resin E44, the curing agent is 650 polyamide resin, and the diluent is C12-14 alkyl glycidyl ether; The epoxy resin E44 accounts for 57.69% of the total mass of the adhesive system, and the 650 polyamide resin accounts for 26.92% of the total mass of the adhesive system; C12-14 alkyl glycidyl ether accounts for 15.39% of the total mass of the adhesive system; The steel fiber is pretreated as follows: mix KH-550 and ethanol in proportion, the mass fraction of KH-550 after mixing is 5%, adjust the pH value of the mixed solution to 4 with acetic acid solution, wash and dry the The steel fibers were put into a mixed solution with a pH value of 4, heated in a water bath to 60°C, kept at a constant temperature and stirred for 1 hour, washed with distilled water and ethanol and dried. 2. The steel-polypropylene fiber artificial granite composite material adding foam particles according to claim 1, characterized in that: the steel-polypropylene fiber is a mixture of steel fiber and polypropylene fiber, wherein the steel fiber is the surface Copper-coated steel fibers have a diameter of 500 μm and an aspect ratio of 50-70; polypropylene fibers have a diameter of 35 μm and a length of 12 mm or 19 mm, and the content ratio of steel fibers to polypropylene fibers is (26-32):1. 3. The steel-polypropylene fiber artificial granite composite material with foam particles added according to claim 1, characterized in that: the filler is a mixture of magnesium sulfate and mica powder, wherein the magnesium sulfate has a particle size of 60 mesh and a content greater than 99 %; the particle size of mica powder is 1250 mesh, the moisture content is less than 0.1%, and the ratio of magnesium sulfate to mica powder content is 1:2. 4. according to the preparation method of the steel-polypropylene fiber artificial granite composite material that adds foam particles according to any one of claims 1 to 3, it is characterized in that the steps are as follows: ① Wash the aggregates, crush and dry them, screen the dried aggregates according to the particle size, and weigh the aggregate content of the required particle size according to the aggregate gradation requirements; ②Weigh the steel-polypropylene fiber according to the proportion, the steel-polypropylene fiber is a mixture of steel fiber and polypropylene fiber, carry out surface pretreatment to the steel fiber, weigh the steel fiber and polypropylene fiber according to the mixture ratio of the mixed fiber content; ③Weigh the foam particles according to the proportion; ④ Mix ①②③ and stir evenly; ⑤ Weigh the composite binder according to the proportion, mix and stir evenly; ⑥ Weigh the filler according to the ratio requirements; ⑦ Mix ⑤ ⑥ and stir evenly; ⑧Mix ④⑦ and stir evenly; ⑨The stirred composite material is cast into a mold coated with a release agent, and vibrated by a vibrating table; ⑩After demoulding, curing at room temperature, and curing, the test piece was obtained. 5. the preparation method of the steel-polypropylene fiber artificial granite composite material that adds foam particles according to claim 4, is characterized in that: the rotating speed of agitator is 45r/min in the described step ⑨, and stirring time is 5min, and vibrating table The vibration frequency is 100HZ～125HZ, the amplitude is 0.25mm～0.8mm, and the vibration time is 1h.