A stone pressurized strengthening process based on silicon-based reinforcer

Abstract

The application discloses a kind of stone pressurized strengthening processes based on silicon-based reinforcing agent, it is related to stone processing technical field, comprising the following steps: step one, reinforcing agent preparation: the modulus of 3.2 sodium silicate is mixed with 0.4%JFC solution, stirring is carried out under the speed of 500r / min 10min;Step two, pressurized injection: the stone is placed in pressure vessel, inject the above-mentioned reinforcing agent, and pressure is applied to keep pressure;Step three, subsection drying: including low-temperature first-stage drying and high-temperature second-stage drying.The process is through subsection drying process, especially the rapid solidification of high-temperature section, so that silicon-based reinforcing agent forms dense network structure in the stone, and the compression strength increases by more than 100%, completely meets and far exceeds national standard.

Description

Technical Field

[0001] This invention relates to the field of stone processing technology, specifically to a stone pressure strengthening process based on silicon-based reinforcing agents, which is suitable for stones with coarse grains and low inter-grain bonding density. Background Technology

[0002] As the building decoration industry continues to raise its requirements for stone quality, some stones, although of excellent color, have a loose internal structure and poor intergranular bonding, which cannot meet the requirements of national standards (such as compressive strength and wear resistance) due to insufficient strength, resulting in a large number of high-quality raw blocks not being effectively utilized.

[0003] Currently, common stone strengthening methods on the market mainly include surface spraying and atmospheric pressure impregnation. These methods primarily rely on the natural penetration of the strengthening agent and have the following significant drawbacks: Limited penetration depth: The reinforcing agent can only penetrate a few millimeters into the surface layer of the stone, and cannot effectively reinforce the internal structure of the stone. After the reinforced stone is cut or ground, the cross-section is still loose.

[0004] Incomplete strengthening effect: For stone with coarse grains and high porosity, the strengthening agent under normal pressure has difficulty overcoming capillary resistance to enter deep micro-cracks, resulting in a small increase in overall strength, and sometimes still failing to meet national standards.

[0005] Therefore, there is an urgent need for a strengthening process that can achieve deep penetration of the strengthening agent and significantly improve the overall physical properties of the stone. Summary of the Invention

[0006] The purpose of this invention is to provide a stone pressure strengthening process based on silicon-based reinforcing agents to solve the problem of low strength of stone currently on the market, as mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a stone pressure strengthening process based on silicon-based reinforcing agents, comprising the following steps: Step 1, Preparation of reinforcing agent: Mix water glass with a modulus of 3.2 with 0.4% JFC solution and stir at 500 r / min for 10 min; Step 2, pressurized injection: Place the stone in a pressure vessel, inject the above-mentioned reinforcing agent, and apply pressure to maintain the pressure; Step 3, segmented drying: including low-temperature first-stage drying and high-temperature second-stage drying.

[0008] Preferably, the pressure parameters in the pressurization injection step are: a pressurization intensity of 10 MPa; and the optimal pressure is 80% of the fracturing value.

[0009] Preferably, the segmented drying step specifically includes: First stage of drying: The temperature is controlled below 95℃, and the drying time is 4-10 hours; Two-stage drying: The temperature is controlled above 200℃, and the drying time is 0.5 hours.

[0010] Preferably, the drying temperature of the first stage is adjusted according to the initial strength of the stone, specifically including: When the strength of the stone is less than 10MPa, the drying temperature for one stage is 40℃. When the strength of the stone is 10~20MPa, the drying temperature for one stage is 40~50℃; When the strength of the stone is 20~30MPa, the drying temperature for one stage is 50~60℃. When the strength of the stone is 30~40MPa, the drying temperature for one stage is 60~70℃; When the strength of the stone is 40~50MPa, the drying temperature for one stage is 70~80℃; When the stone strength is 50~60MPa, the first drying temperature is 80~90℃; The formula for calculating the initial strength of stone is:

[0011] In the formula: p is the initial strength of the stone; r , r 0 represents the density of water at room temperature under the first drying temperature.

[0012] In the preparation of the reinforcing agent, the concentration of sodium silicate is 70-85%.

[0013] Preferably, in the pressurization injection step, after the pressure reaches the selected value, as the permeation pressure of the reinforcing agent gradually decreases, the time when the pressure reaches a stable value is recorded as the final pressurization time.

[0014] Compared with the prior art, the beneficial effects of the present invention are: Deep penetration: The pressure method overcomes the resistance of the pores inside the stone, allowing the reinforcing agent to penetrate to a depth of several centimeters or even deeper, achieving overall reinforcement from the inside out, and solving the problem that traditional methods can only "treat the symptoms but not the root cause".

[0015] High strength enhancement: Through segmented drying process, especially the rapid curing at high temperature, the silicon-based reinforcing agent forms a dense network structure inside the stone, increasing the compressive strength by more than 100%, fully meeting and far exceeding national standards.

[0016] High applicability: This process is particularly suitable for the modification of marble, sandstone and other stone materials with coarse grains, high porosity and loose structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the JFC viscosity and water viscosity curves as a function of temperature according to the present invention; Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Taking Muwang marble from Zhen'an County as an example, the specific steps are as follows: Preparation of strengthening agent: Add 40 mL of 0.4% JFC solution to 100 mL of water glass with a modulus of 3.2, and stir at 500 r / min for 10 min to obtain silicon-based stone strengthening agent.

[0020] Pressure injection treatment: Place a 5cm cube of Zhen'an County Muwang marble into a pressure vessel, then fill the pressure vessel with the silicon-based reinforcing agent prepared in step 1, seal the pressure vessel, pressurize to 10MPa (approximately 80% of the stone's fracturing value), maintain the pressure for 24 hours, and after depressurization, adjust the pressure back to the selected pressure value. Segmented drying and curing: After the pressurization process is completed, the pressure is adjusted back to normal pressure, the marble specimen is taken out, the surface of the marble specimen is rinsed and then placed at 80℃ for 6 h (first stage drying), and then dried at 210℃ for 0.5 h (second stage drying).

[0021] Test Results The original compressive strength of the Muwang marble from Zhen'an County was 25.59±5.43 MPa, while the compressive strength of the sample processed with conventional strengthening technology was 45.86±0.67 MPa. The strength of all tested samples was lower than the national standard value. The compressive strength of the sample processed with pressure-distribution drying technology was 61.2±1.81 MPa, and all four tested samples met the national standard value.

[0022] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stone pressure strengthening process based on silicon-based reinforcing agents, characterized in that, Includes the following steps: Step 1, Preparation of reinforcing agent: Mix water glass with a modulus of 3.2 with 0.4% JFC solution and stir at 500 r / min for 10 min; Step 2, pressurized injection: Place the stone in a pressure vessel, inject the above-mentioned reinforcing agent, and apply pressure to maintain the pressure; Step 3, segmented drying: including low-temperature first-stage drying and high-temperature second-stage drying.

2. The stone pressure strengthening process based on silicon-based reinforcing agents according to claim 1, characterized in that, The pressure parameters in the pressurized injection step are: pressurization intensity of 10 MPa; the optimal pressure should be 80% of the fracturing value.

3. The stone pressure strengthening process based on silicon-based reinforcing agents according to claim 1, characterized in that, The segmented drying step is specifically as follows: First stage of drying: The temperature is controlled below 95℃, and the drying time is 4-10 hours; Two-stage drying: The temperature is controlled above 200℃, and the drying time is 0.5 hours.

4. The stone pressure strengthening process based on silicon-based reinforcing agents according to claim 3, characterized in that, The drying temperature of the aforementioned section is adjusted according to the initial strength of the stone, specifically including: When the strength of the stone is less than 10MPa, the drying temperature for one stage is 40℃. When the strength of the stone is 10~20MPa, the drying temperature for one stage is 40~50℃; When the strength of the stone is 20~30MPa, the drying temperature for one stage is 50~60℃. When the strength of the stone is 30~40MPa, the drying temperature for one stage is 60~70℃; When the strength of the stone is 40~50MPa, the drying temperature for one stage is 70~80℃; When the stone strength is 50~60MPa, the first drying temperature is 80~90℃; The formula for calculating the initial strength of stone is: ； In the formula: p is the initial strength of the stone; ρ , ρ 0 represents the density of water at room temperature under the first drying temperature.

5. The stone pressure strengthening process based on silicon-based reinforcing agents according to claim 1, characterized in that, In the preparation of the reinforcing agent, the concentration of sodium silicate is 70-85%.

6. The stone pressure strengthening process based on silicon-based reinforcing agents according to claim 1, characterized in that, In the pressurization injection step, after the pressure reaches the selected value, as the permeation pressure of the reinforcing agent gradually decreases, the time when the pressure reaches a stable value is recorded as the final pressurization time.

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