Environment-friendly hose based on steel slag source calcium carbonate and preparation method thereof

Abstract

The invention discloses an environment-friendly hose based on steel slag source calcium carbonate and a preparation method thereof, and belongs to the technical field of new materials. Steel slag solid waste is used as a raw material to extract calcium carbonate to replace traditional mineral filler, and the hose comprises the following components in parts by weight: 80-100 parts of a thermoplastic polymer matrix, 20-50 parts of steel slag source calcium carbonate, 5-15 parts of a plasticizer, 1-3 parts of a stabilizer and 0.5-2 parts of a lubricant. The preparation method comprises the following steps: crushing steel slag, calcining and activating at 850 DEG C, extracting with a 5% citric acid solution to remove impurities, and carrying out carbonization reaction to generate nano calcium carbonate; and mixing the modified calcium carbonate and the polymer matrix in an internal mixer at 160-180 DEG C, and carrying out extrusion molding through double screws. The tensile strength of the hose is greater than or equal to 18MPa, and the elongation at break is gt; the utilization rate of calcium carbonate is gt; 95%. High-valued utilization of the steel slag solid waste is achieved, compared with a traditional hose, the cost is reduced by 22%, the degradation rate is increased by 40%, and the hose is suitable for the fields of agricultural irrigation and industrial fluid conveying.

Description

Technical Field

[0001] The present invention belongs to the technical field of new materials, and in particular relates to an environmentally friendly hose based on steel slag-derived calcium carbonate and a preparation method thereof. Background Art

[0002] Traditional hoses are widely manufactured using a composite of petroleum-based polymers (such as PVC and PE) and the mineral calcium carbonate. Statistics show that each ton of hose consumes approximately 300 kg of heavy calcium carbonate, with annual global mining exceeding 200 million tons. Large-scale mining of calcium carbonate leads to mountain destruction, dust pollution, and ecological imbalance, which is inconsistent with the concept of green manufacturing.

[0003] The steelmaking process generates a significant amount of steel slag solid waste, with my country's annual production exceeding 100 million tons, yet its comprehensive utilization rate is less than 30%. Steel slag contains 40-60% by weight of calcium components (free CaO, dicalcium silicate, etc.). Natural stockpiling of this waste can lead to soil alkalinization and the risk of heavy metal precipitation. Existing technologies often use steel slag as roadbed filler or cement admixture, resulting in low added value and a failure to fully utilize the calcium resource.

[0004] While attempts to produce calcium carbonate from steel slag have emerged in recent years, traditional solutions present a dilemma. While using high-purity calcium carbonate (purity >99%) can guarantee performance, the raw material cost accounts for 32% of the total cost of the hose. Using cheaper calcium carbonate from steel slag results in a permanent compression set of >25% (the national standard requires <15%). Existing technologies are unable to simultaneously meet the three requirements of resource recycling, performance compliance, and cost control, becoming a key bottleneck hindering the high-value utilization of solid waste. Summary of the Invention

[0005] To solve the problem in existing technologies that it is difficult to balance resource recycling, performance compliance and cost control.

[0006] In order to solve the above problems, the present invention provides the following technical solutions:

[0007] The preparation method of the environmentally friendly hose based on steel slag-derived calcium carbonate is characterized by comprising the following steps:

[0008] S1: Steel slag calcium carbonate is dried at 110℃ until the moisture content is less than 0.5%;

[0009] S2: Add calcium carbonate and polymer matrix into internal mixer and mix at 160-180℃ for 8 minutes;

[0010] S3: Twin-screw extruder five-stage temperature control: 170℃-175℃-180℃-175℃-170℃;

[0011] S4: After cooling and shaping, the hose is wound and packaged.

[0012] Preferably, 1.5 parts of silane coupling agent KH-550 is added during the mixing process in S2.

[0013] Preferably, the tensile strength of the hose in S4 is ≥18 MPa, and the elongation at break is ≥250%.

[0014] Preferably, the hose in S4 has a permanent deformation of less than 15% after 1000 cycles of compression at 30% strain.

[0015] Effects and advantages of the environmentally friendly hose based on steel slag-derived calcium carbonate and its preparation method of the present invention:

[0016] 1. This patent is to convert solid waste into high value, using steel slag to replace limestone ore. Each ton of hose can absorb 150kg of steel slag solid waste, with a utilization rate of >95%.

[0017] 2. According to this patent, the cost of steel slag raw materials is 1 / 3 of that of mineral calcium carbonate, and the overall production cost is reduced by 15-20%.

[0018] 3. This patent uses acid-activated carbonization of steel slag to produce nano-calcium carbonate (D50=80nm), which forms an "island structure" with the polymer, increasing the tensile strength of the hose to 18-22MPa.

[0019] 4. This patent has a heavy metal leaching concentration of <0.1mg / L (national standard limit 1mg / L), and a 60-day soil degradation rate of >30%. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a flow chart of the environmentally friendly hose based on steel slag-derived calcium carbonate and its preparation method in the present invention. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0022] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus. In the absence of further restrictions, the elements defined by the sentence "include..." do not exclude the presence of other identical elements in the process, method, article or apparatus that includes the elements.

[0023] Example 1

[0024] refer to Figure 1 This embodiment provides an environmentally friendly hose based on steel slag-derived calcium carbonate and a preparation method thereof, which is applicable to the field of new material technology and includes the following implementation contents:

[0025] Purpose of the experiment:

[0026] An environmentally friendly hose based on steel slag-derived calcium carbonate and its preparation method are used to verify the mechanical properties of the hose filled with steel slag calcium carbonate.

[0027] Experimental materials:

[0028] 85 parts of PVC resin (K=67), 30 parts of steel slag calcium carbonate, 12 parts of DOP plasticizer, and 2 parts of calcium zinc stabilizer.

[0029] Experimental equipment:

[0030] Internal mixer (SX-300), twin-screw extruder (SJZS-10), blast drying oven (DHG-9030A), high-speed mixer (SHR-50A, speed 1200rpm), cooling water tank (constant temperature control ±1℃).

[0031] Experimental steps:

[0032] S1: Raw material pretreatment: Place the steel slag-derived calcium carbonate filler in a forced air drying oven at 110°C and dry continuously for 3 hours until the moisture content is less than 0.5% (measured value 0.32%). At the same time, pass the PVC resin through a 100-mesh sieve for later use;

[0033] S2: Start the internal mixer and preheat the mixing chamber to 170°C. Then, add 85 parts of PVC resin, 12 parts of dioctyl phthalate (DOP) plasticizer, and 2 parts of calcium-zinc composite stabilizer (containing antioxidant BHT) in sequence. Start the mixing process and mix at 30 r / min for 5 minutes until a uniform molten gel mass is formed.

[0034] S3: 30 parts (300 g) of pretreated steel slag calcium carbonate were added to the mixing chamber in three portions: 50% was added initially and mixed for 2 minutes; 30% was added and mixed for 3 minutes; and the remaining 20% ​​was added and mixed for 3 minutes. The temperature was maintained at 170°C throughout the process, and the rotor speed was increased to 45 rpm for a total mixing time of 8 minutes.

[0035] S4: The mixed material was transferred to a twin-screw extruder with an extrusion rate of 2.5 m / min. Five temperature zones were set: zone 1 (feeding) 170°C, zone 2 (melting) 175°C, zone 3 (mixing) 180°C, zone 4 (homogenization) 175°C, and zone 5 (die) 170°C. The die was equipped with an annular die (inner diameter 10 mm, wall thickness 1.5 mm).

[0036] S5: The extrudate is cooled and shaped in a water tank (25°C) and then pulled and rolled.

[0037] Experimental results: See Table 1 for details.

[0038] Table 1: Test results of Example 1

[0039]

[0040] Example 1: Environmentally friendly hose based on steel slag source calcium carbonate and its preparation method, with a tensile strength of 19.3 MPa. After the steel slag is leached and impurities are removed, the specific surface area of ​​the calcium carbonate generated by carbonization reaches 35m 2 / g (far exceeding the 5-10m 2 / g), the nano-calcium carbonate reinforcement phase forms a "core-shell island structure" with the matrix. The elongation at break is 278%. The DOP plasticizer molecules are embedded between the PVC molecular chains, lowering the glass transition temperature. Nano-calcium carbonate forms micron-sized "islands" in the matrix. The plasticizer is preferentially enriched at the island interface to form a low-viscosity layer. During tensile deformation, the calcium carbonate particles slide and rotate with the matrix. The elongation at break is 278%. This is because the steel slag-derived calcium carbonate is processed (calcination + acid leaching + carbonization) to form spherical nanoparticles. The nanoparticles form an "island structure" in the PVC matrix. The matrix continuous phase (sea phase) covers the dispersed calcium carbonate particles (island phase), which triggers a silver shear band effect when subjected to force. The nanoparticles hinder crack propagation, forcing the crack path to become tortuous and absorbing more fracture energy. The reasons for the 91% strength retention rate after heat aging at 60℃ for 168h are as follows: the impurities were thoroughly removed, and the citric acid extraction effectively removed the heavy metal ions such as iron and manganese in the steel slag (content ≤ 0.01%), eliminating their role in catalyzing the breakage of PVC molecular chains; the surface was passivated and dense, and nano calcium carbonate (BET 38m 2 / g) is modified by silane coupling to form an organic coating layer, which blocks the corrosion of the substrate by thermal oxygen; the crystal core stabilizes the structure, and the "rigid island" structure (particle size 80nm) formed by the uniform dispersion of calcium carbonate anchors the polymer molecular chain and inhibits the molecular chain slip at high temperature.

[0041] Example 2

[0042] This example provides an environmentally friendly hose based on steel slag-derived calcium carbonate and a preparation method thereof, and explores the effect of coupling agent modification on improving the dynamic fatigue performance of composite materials, including the following implementation contents:

[0043] Purpose of the experiment:

[0044] An environmentally friendly hose based on steel slag-derived calcium carbonate and its preparation method were used to verify the effect of high-proportion steel slag calcium carbonate filling (45 parts) on the flexibility of thermoplastic elastomer (TPE) hose.

[0045] Experimental materials:

[0046] 90 parts of SEBS (YH-503) matrix, 45 parts of steel slag source calcium carbonate, 25 parts of cycloparaffin white oil (KN4010), 1.8 parts of titanate coupling agent (NDZ-105), and 0.5 parts of antioxidant (1010).

[0047] Experimental steps:

[0048] S1: Calcium carbonate pretreatment: steel slag calcium carbonate is placed in a high-speed mixer, heated to 80°C, and then sprayed with titanate coupling agent three times (with a 2-minute interval between each time), mixed at 3000 rpm for 15 minutes, and discharged after forming a surface coating layer;

[0049] S2: Start the internal mixer and preheat the mixing chamber to 170°C. Add SEBS, white oil, and antioxidant in sequence and mix for 3 minutes until completely melted. Add pretreated calcium carbonate and mix at 45 rpm for 10 minutes. Discharge the material when the torque value stabilizes at 28 N·m (indicating uniform dispersion).

[0050] S3: The mixed material was transferred to a twin-screw extruder with an extrusion rate of 2.5 m / min. Five temperature zones were set: zone 1 (feeding) 170°C, zone 2 (melting) 175°C, zone 3 (mixing) 180°C, zone 4 (homogenization) 175°C, and zone 5 (die) 170°C. The die was equipped with an annular die (inner diameter 10 mm, wall thickness 1.5 mm).

[0051] S4: The extrudate is cooled and shaped in a water tank (25°C) and then pulled and rolled.

[0052] Experimental results: See Table 2 for details.

[0053] Table 2: Test results of Example 2

[0054]

[0055] Example 2 An environmentally friendly hose based on steel slag-derived calcium carbonate and its preparation method has a bending modulus of 320 MPa (pure SEBS hose is about 390 MPa). The titanate coupling agent forms organic long chains on the surface of the calcium carbonate, reducing the interface energy between the filler and the matrix. The white oil molecules are inserted between the SEBS molecular chains, and the "ball effect" of nano-calcium carbonate is combined to reduce the deformation resistance of the material by 18%. It does not break at -30°C, and its low-temperature brittleness resistance is broken through. Nano-calcium carbonate (particle size 85nm) acts as a nucleating agent to induce SEBS to form a smaller crystalline region (grain size <50nm), avoiding stress concentration caused by large-sized crystals at low temperatures. The flexible interface layer formed by the coupling agent can effectively transmit and dissipate impact energy (the impact section shows a tough tearing morphology). There is no crack in 500,000 dynamic bendings, the filler is evenly dispersed, the crack propagation path under cyclic stress is blocked by the bent SEBS molecular chains and calcium carbonate particles, the organic layer on the surface of calcium carbonate hinders the slippage of the molecular chain, and the cross-linked network has better resilience.

[0056] Example 3

[0057] This embodiment provides an environmentally friendly hose based on steel slag-derived calcium carbonate and a preparation method thereof, analyzes the synergistic effect of steel slag-derived calcium carbonate and biodegradable polyester, and includes the following implementation contents:

[0058] Purpose of the experiment:

[0059] An environmentally friendly hose based on steel slag-derived calcium carbonate and its preparation method were developed to verify the synergistic effect of steel slag-derived calcium carbonate and biodegradable polyester, and to quantify the degradation efficiency of the hose in the soil environment.

[0060] Experimental materials:

[0061] 70 parts of polyvinyl chloride (PVC, SG-5), 15 parts of polylactic acid (PLA, 4032D), 35 parts of steel slag source calcium carbonate, 8 parts of epoxy soybean oil (plasticizer), 2 parts of calcium zinc stabilizer (RY-Zn302), and 5 parts of polybutylene adipate (PBAT, degradation rate regulator).

[0062] Experimental steps:

[0063] S1: Raw material pretreatment: Calcium carbonate filler derived from steel slag was placed in a forced air drying oven at 110°C for 3 hours until the moisture content was less than 0.5% (measured value 0.32%). It was then sprayed with a 2 wt% silane coupling agent (KH-550) ethanol solution and activated at 60°C for 30 minutes.

[0064] S2: Start the internal mixer and preheat the mixing chamber to 170°C. Add 70 parts of PVC resin, 15 parts of polylactic acid, and 5 parts of polybutylene adipate in sequence. Start the mixing process and mix at 30 r / min for 5 minutes. Add plasticizer and stabilizer and mix for 3 minutes. Add modified calcium carbonate three times for a total mixing time of 12 minutes. Discharge the material when the melt torque stabilizes at 28 N·m±1.

[0065] S3: The mixed material was transferred to a twin-screw extruder with an extrusion rate of 2.5 m / min. Five temperature zones were set: zone 1 (feeding) 170°C, zone 2 (melting) 175°C, zone 3 (mixing) 180°C, zone 4 (homogenization) 175°C, and zone 5 (die) 170°C. The die was equipped with an annular die (inner diameter 10 mm, wall thickness 1.5 mm).

[0066] S4: Cool in a water bath (15±1°C) and then pelletize;

[0067] S5: Sample preparation and testing: Standard dumbbell-shaped specimens (ISO 527-2) were injection molded. Composting degradation was performed according to ISO 14855. The composting matrix was a mixture of animal manure and straw (C / N = 25:1). The temperature and humidity of the chamber were controlled at 58 ± 2°C and 60% respectively. The specimens were buried at a depth of 10 cm.

[0068] Experimental results: See Table 3 for details.

[0069] Table 3: Test results of Example 3

[0070]

[0071] Example 3 Environmentally friendly hose based on steel slag source calcium carbonate and its preparation method, the degradation weight loss rate (60 days) reaches 32.5%, the calcium ions (Ca 2+ ) acts as a Lewis acid to catalyze the hydrolysis of the ester bond of the PLA molecular chain, and the slightly alkaline environment of calcium carbonate (pH ≈ 8.2) promotes the proliferation of actinomycetes, and the secreted lipase accelerates the depolymerization of PLA. The CO2 release (60 days) is 285 mg / g, and the Ca provided by calcium carbonate is 2. 2+Activating the tricarboxylic acid cycle of soil microorganisms increases bacterial abundance, and these strains completely mineralize PLA degradation products into CO2. The tensile strength retention rate (60 days) is 63%, and the elongation at break retention rate (60 days) is 58%. Although PLA degradation reduces strength, the steel slag calcium carbonate, due to its small particle size and large specific surface area, maintains a load-bearing capacity of more than 70% as a rigid skeleton. The supporting role of the calcium carbonate skeleton delays overall collapse. In heavy metal leaching, Pb <0.01mg / L, Cr <0.03mg / L. After being modified with a silane coupling agent, the steel slag calcium carbonate forms an island-network structure with PVC, extending the diffusion path of heavy metal ions. Furthermore, the steel slag is pretreated with a 5% citric acid solution for extraction, and the carboxyl functional groups of citric acid form stable water-soluble complexes with heavy metal ions.

[0072] Comparative Example 1

[0073] A method for preparing a hose directly filled with unactivated steel slag is provided, which is applicable to the field of new material technology and includes the following implementation contents:

[0074] Purpose of the experiment:

[0075] A preparation method for directly filling hoses with unactivated steel slag was developed to verify the effect of directly using unactivated steel slag powder as filler on hose performance and to clarify the necessity of "calcination activation + leaching and impurity removal" in the process.

[0076] Experimental materials:

[0077] Hot rolled steel slag powder (mechanically crushed to 100 mesh, untreated), 85 parts of PVC resin (S-70 type), 12 parts of DOP plasticizer, and 2 parts of calcium zinc stabilizer.

[0078] Experimental steps:

[0079] S1: The steel slag powder was placed in a forced air drying oven at 110°C for 3 hours without calcination or acid leaching. Meanwhile, the PVC resin and plasticizer were pre-mixed at 80°C for 10 minutes.

[0080] S2: Start the internal mixer, preheat the mixing chamber to 170°C, add the PVC premix, add the steel slag powder and stabilizer after 2 minutes, mix at 180°C for 8 minutes (speed 40 rpm), and control the discharge temperature at 175°C;

[0081] S3: The mixed material was transferred to a twin-screw extruder with an extrusion rate of 2.5 m / min. Five temperature zones were set: zone 1 (feeding) 170°C, zone 2 (melting) 175°C, zone 3 (mixing) 180°C, zone 4 (homogenization) 175°C, and zone 5 (die) 170°C. The die was equipped with an annular die (inner diameter 10 mm, wall thickness 1.5 mm).

[0082] S5: The extrudate is cooled and shaped in a water tank (25°C) and then pulled and wound up.

[0083] Experimental results: see Table 4 for details.

[0084] Table 4: Test results of Comparative Example 1

[0085]

[0086]

[0087] Comparative Example 1 provides a method for preparing a soft tube filled with unactivated steel slag, with a tensile strength of only 9.2 MPa. The effective calcium component (CaO) in the unactivated steel slag is wrapped by silicates and cannot participate in the formation of the reinforcing phase. Coarse particles form stress concentration points in the matrix. The elongation at break is only 89% (much lower than the 278% of Example 1), and the fundamental reason is that there are serious interface defects and stress concentration effects between the unactivated steel slag filler and the polymer matrix. The diameter expands by 8.3% after 7 days of water immersion. The residual free CaO in the steel slag reacts with water, and the product volume increases, leading to the destruction of the pipe structure. The Pb precipitation concentration reaches 0.38 mg / L (7.6 times that of the patented product), and the steel slag contains lead and zinc smelting by-products. Without acid leaching treatment, heavy metal oxides such as PbO are directly dissolved out. The surface particles are raised, and coarse steel slag powder (maximum particle size > 80 μm) cannot be melted and dispersed during extrusion, and the interface bonding with the polymer is poor.

[0088] Example 1 mainly explores the environmentally friendly soft tube based on steel slag-derived calcium carbonate and its preparation method, and verifies its mechanical properties. The experimental results show that the tensile strength of the prepared environmentally friendly soft tube reaches 19.3 MPa, showing good mechanical strength. The elongation at break is as high as 278%, indicating that the soft tube has excellent flexibility and ductility. After 60°C x 168h heat aging test, the strength retention rate is still as high as 91%, which is due to the complete removal of impurities, surface passivation and dense structure of steel slag calcium carbonate, and stable crystal nucleus structure. Steel slag calcium carbonate forms spherical nanoparticles after process treatment, forming an "island structure" in the PVC matrix, effectively improving the mechanical properties of the material. In addition, the "core-shell island structure" formed by the nanometer calcium carbonate reinforcing phase and the matrix also enhances the toughness of the material. These results fully demonstrate the superiority of the environmentally friendly soft tube based on steel slag-derived calcium carbonate in terms of mechanical properties.

[0089] Example 2 focuses on the effect of coupling agent modification on the improvement of the dynamic fatigue performance of composite materials. The experiment found that the bending modulus reached 320MPa by filling a high proportion of steel slag calcium carbonate into a thermoplastic elastomer (TPE) hose, which is close to the performance of a pure SEBS hose (about 390MPa). In the low-temperature impact test at -30°C, the hose was crack-free and did not break, showing excellent low-temperature brittleness resistance. After 500,000 dynamic bending fatigue tests, there was still no cracking on the surface of the hose. These excellent properties are due to the fact that the titanate coupling agent forms long organic chains on the surface of calcium carbonate, which reduces the interfacial energy between the filler and the matrix. At the same time, the "ball effect" of white oil molecules and nano-calcium carbonate jointly reduces the deformation resistance of the material. In addition, the flexible interface layer formed by the coupling agent can also effectively transmit and dissipate impact energy, further improving the dynamic fatigue performance of the hose.

[0090] Example 3 mainly analyzes the synergistic effect of steel slag-derived calcium carbonate and biodegradable polyester, and quantifies the degradation efficiency of the hose in a soil environment. The experimental results show that the prepared environmentally friendly hose has a degradation weight loss rate of 32.5% and a CO2 release of 285 mg / g in a 60-day composting degradation experiment. Although the tensile strength retention rate and the elongation at break retention rate have decreased to 65% and 58% respectively, the steel slag calcium carbonate maintains a high load-bearing capacity as a rigid skeleton. In addition, the heavy metal leaching test results show that Pb <0.01 mg / L and Cr <0.03 mg / L, which are far below the safety standards. These results show that the synergistic effect of steel slag-derived calcium carbonate and biodegradable polyester not only promotes the degradation efficiency of the hose, but also ensures the environmental friendliness and safety of the product.

[0091] Comparative Example 1 provides a preparation method for directly filling a hose with unactivated steel slag, and verifies its effect on the performance of the hose. The experimental results show that the tensile strength of the prepared hose is only 9.2 MPa, which is much lower than the 19.3 MPa of Example 1. The elongation at break is also only 89%, which is much lower than the 278% of Example 1, showing poor flexibility and ductility. In addition, the volume expansion rate of the hose reached 8.3% in a 7-day water immersion test, and the Pb precipitation concentration was as high as 0.38 mg / L, far exceeding the safety standard. Obvious particle protrusions and gray color also appeared on the surface of the pipe. These results fully demonstrate that the direct use of unactivated steel slag powder as a filler will seriously damage the performance of the hose, and clarify the necessity of "calcination activation + leaching and impurity removal" in the process.

[0092] Those skilled in the art can understand that the modules and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0093] In addition, each functional module in each embodiment of the present application can be integrated in one processing module, or each module can exist physically alone, or two or more modules can be integrated in one module.

[0094] The above is merely specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any modification or replacement within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0095] Finally: the above is merely preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection of the present application.

Claims

1. Environmentally friendly hose based on steel slag source calcium carbonate, characterized by: Includes the following components: 80-100 parts of thermoplastic polymer matrix, 20-50 parts of steel slag source calcium carbonate, 5-15 parts of plasticizer, 1-3 parts of stabilizer, and 0.5-2 parts of lubricant.

2. The environmentally friendly hose based on steel slag-derived calcium carbonate according to claim 1, characterized in that: The thermoplastic polymer is selected from at least one of PVC, TPE, and POE.

3. The environmentally friendly hose based on steel slag-derived calcium carbonate according to claim 1, characterized in that: The steel slag-derived calcium carbonate is prepared by the following method: crushing the steel slag into 100 mesh, calcining at 850° C. for 2 h to activate the calcium component, leaching and removing impurities with 5 wt % citric acid solution at a solid-liquid ratio of 1:5, introducing CO2 gas for carbonization reaction, and the end point pH = 8.

0.

4. The environmentally friendly hose based on steel slag-derived calcium carbonate according to claim 3, characterized in that: The steel slag source calcium carbonate has a BET specific surface area of ​​≥35m 2 / g, CaCO3 purity>98%.

5. The environmentally friendly hose based on steel slag-derived calcium carbonate as claimed in claim 3, characterized in that: The steel slag-derived calcium carbonate has a flake structure, an aspect ratio of 5-10, and a thickness of 50-200 nm.

6. The environmentally friendly hose based on steel slag-derived calcium carbonate as claimed in claim 3, characterized in that: The extraction and impurity removal uses a 5wt% citric acid solution, the solid-liquid ratio is controlled at 1:5, and the extraction is carried out with stirring at a constant temperature of 65°C for 90 minutes. The heavy metal ion concentration of the end point filtrate is ≤0.1ppm.

7. A method for preparing an environmentally friendly hose based on steel slag-derived calcium carbonate, characterized in that: The following steps are involved: S1: Steel slag calcium carbonate is dried at 110℃ until the moisture content is less than 0.5%; S2: Add calcium carbonate and polymer matrix into internal mixer and mix at 160-180℃ for 8 minutes; S3: Twin-screw extruder five-stage temperature control: 170℃-175℃-180℃-175℃-170℃; S4: After cooling and shaping, the hose is wound and packaged.

8. The method for preparing an environmentally friendly hose based on steel slag-derived calcium carbonate according to claim 7, characterized in that: In the mixing process of S2, 1.5 parts of silane coupling agent KH-550 are added.

9. The method for preparing an environmentally friendly hose based on steel slag-derived calcium carbonate according to claim 7, characterized in that: The tensile strength of the hose in S4 is ≥18 MPa, and the elongation at break is ≥250%.

10. The method for preparing an environmentally friendly hose based on steel slag-derived calcium carbonate according to claim 7, characterized in that: The S4 hose has a permanent deformation of <15% after 1000 cycles of compression at 30% strain.

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