Silicate modified polyurethane material for coal and rock mass reinforcement and preparation device

Abstract

The invention discloses a silicate modified polyurethane material for coal and rock mass reinforcement and a preparation device, and relates to the technical field of silicate modified polyurethane materials.A component A based on silicate is matched with a component B based on polymerized MD I to generate the polyurethane material, the stability of an inorganic material and the flexibility of an organic material are both considered, and the performance of the material is improved; the reinforcing agent can be attached to the rough porous surface of the coal and rock mass to achieve sufficient permeation and can also adapt to subsequent tiny deformation of the coal and rock mass, the reinforcing effect is more reliable, and the strength and integrity of the coal and rock mass are greatly enhanced. In the preparation process, a silicate modified polyurethane material preparation device is used, it can be guaranteed that the temperature in a whole heat dissipation cavity is uniform, in the lifting process of a mixing barrel, solid impurities generated by premixing can be intercepted in the mixing barrel and prevented from being mixed with follow-up prepared materials, and successive adding and liquid flow disturbance are matched with each other, so that the mixing efficiency is improved. The mixing effect is enhanced, agglomeration is avoided, and quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of silicate modified polyurethane material preparation, in particular to a silicate modified polyurethane material for coal rock mass reinforcement and a preparation device. Background Art

[0002] Silicate modified polyurethane materials for coal rock reinforcement in coal mines are mainly used for grouting reinforcement of broken coal rock in underground mines. They can quickly and effectively improve the bearing capacity of coal rock and ensure the safety of mining. They are mainly used for broken roof and side wall reinforcement of tunnels; advance treatment of coal wall fragments and roof collapse in mining working faces; advance reinforcement of roofs, faults, broken zones and collapse columns in soft coal seams; reinforcement of stone gate coal uncovering, frame removal passages and thin coal pillars, etc.

[0003] The prior art publication number is CN101220203B. The invention proposes a polyurethane chemical grouting material and a preparation method. First, prepare a terminal hydroxyl polyurethane prepolymer: mix, stir, heat, and keep warm at room temperature with a hydrophilic polyol or a small molecule polyether and an isocyanate. When the -NCO% is basically detected by the central control, the reaction is stopped to obtain a terminal hydroxyl polyurethane prepolymer. Then prepare a hydrophilic polyurethane prepolymer: in a reactor equipped with a condenser and stirring, stir the macromolecular polyether and the terminal hydroxyl prepolymer prepared by the reaction. At room temperature, add isocyanate, stir, heat, and keep warm, and detect the -NCO% therein. When the -NCO% is 5.6% to 6.0%, the reaction is stopped. Prepare a polyurethane grouting material again: add a diluent to the prepared polyurethane prepolymer, start stirring, and add a foam stabilizer, a special catalyst for polyurethane, and a plasticizer at the same time. The polyurethane chemical grouting material of the invention has the advantages of single-liquid grouting, simple construction and convenient operation; the gel is non-toxic and can be used for water blocking of tap water pipes, etc.

[0004] At the same time, CN116285311 B in the prior art provides a new type of polyurethane water plugging grouting material and its preparation method, which belongs to the technical field of polyurethane materials and is composed of isocyanate, polymer polyol, epoxy resin, modifier, graphene oxide, catalyst, curing agent, and foam stabilizer. First, a modified graphene oxide epoxy resin mixed liquid is prepared, and then the polymer polyol, catalyst, curing agent and other additives are put into the modified graphene oxide epoxy resin mixed liquid prepared in the second step according to the mass ratio, stirred, and then the isocyanate and foam stabilizer are put into the mixed liquid, stirred, and the final product can be obtained. The novel polyurethane water plugging grouting material of the invention has the characteristics of adjustable reaction speed, low viscosity, high strength of the solid body, low cost, etc. The novel polyurethane water plugging grouting material of the invention has a simple preparation process, little harm to construction personnel, and convenient construction. It is suitable for fine seam water plugging treatment and waterproofing treatment of tunnels, house roofs and walls and other projects.

[0005] In the preparation process of the existing silicate-modified polyurethane materials used for coal rock reinforcement, there is a component whose main component is polymerized MDI, which has a high viscosity. When it is mixed with a component whose main component is silicate to prepare the polyurethane material, the polymerized MDI component does not have time to quickly wrap and disperse the silicate component, thereby causing silicate agglomeration. In addition, heat is generated during the reaction process. If this heat is not dissipated in time, it is easy to cause the silicate-modified polyurethane material to solidify, and the solidified material is mixed inside the overall material, which will affect its quality.

[0006] Therefore, there is a need for a silicate-modified polyurethane material, a preparation device and a preparation method for coal rock reinforcement. Summary of the invention

[0007] In order to solve all or part of the above problems, the purpose of the present invention is to provide a silicate-modified polyurethane material and a preparation device for coal rock reinforcement, so as to solve the problem of uneven mixing between different components causing agglomeration and the solid matter produced being mixed therein and affecting its quality.

[0008] To achieve the above object, the present invention provides the following technical solution: a silicate-modified polyurethane material for coal rock reinforcement, comprising the following components in parts by mass:

[0009] 40-60 parts of silicate salts;

[0010] 10-15 parts of organic plasticizer;

[0011] 2-5 parts of surfactant;

[0012] 5-10 parts of active hydroxyl organic small molecules;

[0013] 10-30 parts of deionized water;

[0014] Polymerization MDI 70-85 parts;

[0015] 2-5 parts of antioxidants;

[0016] Catalyst 0.5-2 parts;

[0017] 10-20 parts of diluent;

[0018] The preparation method of silicate modified polyurethane material for coal rock reinforcement comprises the following steps:

[0019] S1: first pour the calculated amount of silicate salt into a reaction kettle filled with an appropriate amount of deionized water, start stirring, set the speed to 300-500 rpm, and continue stirring for 20-30 minutes until the salt is completely dissolved to form a clear solution;

[0020] S2: Under continuous stirring, slowly dropwise add organic plasticizer for 5-10 minutes, then add surfactant for 3-5 minutes, and finally add active hydroxyl organic small molecules for 3-5 minutes, keeping the stirring speed unchanged throughout the process;

[0021] S3: After the addition of the additive, continue stirring for 30-45 minutes to allow the components to fully mix and react to form a uniform and stable solution, and filter with a filter with a mesh size of 100-200 mesh to remove undissolved impurities to obtain a standby component A;

[0022] S4: In a nitrogen-purged, light-protected reactor, first add polymerized MDI, then slowly add antioxidant, catalyst and diluent in sequence, with an interval of 3-5 minutes between each addition. After the addition is completed, start stirring at a speed of 200-400 rpm, while maintaining the temperature in the reactor at 25-35° C., and stir for 30-45 minutes until the ingredients are evenly mixed to obtain component B;

[0023] S5: extracting component A and component B in a volume ratio of 1:1, and putting them into a silicate-modified polyurethane material preparation device for mixing and preparation;

[0024] The steps for mixing component A and component B in S5 are as follows:

[0025] S51: Component B is fed into the interior of the bendable shrinkable cylinder through the feed pipe. The outer cylinder of the bendable shrinkable cylinder is sleeved with the outer cylinder of the preparation device, and the bottom end of the bendable shrinkable cylinder is fixedly connected to the interior of the outer cylinder of the preparation device. A hydraulic push rod is installed on the inner wall of the outer cylinder of the preparation device. The output end of the hydraulic push rod drives the annular pressing plate to move up and down, drives the top end of the bendable shrinkable cylinder to move up and down, and compresses or stretches the bendable shrinkable cylinder.

[0026] S52: When the bendable shrinkable tube is in a compressed state, the compression of the bendable shrinkable tube drives the mixing preparation component to move upward, the mixing preparation component includes a mixing barrel, the bendable shrinkable tube is in contact with the mixing barrel, and the mixing barrel is sleeved on the outer surface of the guide support column. When the mixing barrel rises upward along the guide support column, the feeding component fixed on the top of the guide support column is triggered, and component A is added into the mixing barrel;

[0027] S53: When the bendable shrinkable tube is in a stretched state, the mixing barrel and the bendable shrinkable tube are separated, and the mixing barrel descends under the action of gravity. The component B inside the bendable shrinkable tube is injected into the mixing barrel through the mixing through hole provided on the outer wall of the mixing barrel, and the component A and the component B are mixed. Then the mixing barrel rises, and the mixed component A and the component B flow into the bendable shrinkable tube through the perforated filter plate provided at the bottom of the mixing barrel;

[0028] S54: At the same time, the condensed water outside the bendable shrink tube can bring out the heat generated by the mixing reaction of component A and component B.

[0029] Preferably, in S54, when the bendable shrink tube is stretched, the volume of the interlayer cavity increases, and the condensed water enters the interlayer cavity through the coolant inlet hose, and exchanges heat with the mixed liquid of component A and component B inside the bendable shrink tube. When the bendable shrink tube is compressed, the volume of the interlayer cavity decreases, and the condensed water inside the interlayer cavity that has absorbed heat flows outward through the outlet hose to the connected chiller, and after being cooled by the chiller, it flows into the interlayer cavity through the coolant inlet hose to form a cycle.

[0030] Preferably, the silicate salt is a mixture of sodium silicate and potassium silicate in a ratio of 1:1.

[0031] Preferably, the organic plasticizer is dibutyl phthalate, the surfactant is sodium dodecylbenzene sulfonate, the active hydroxyl organic small molecule is propylene glycol, the antioxidant is a hindered phenol antioxidant, the catalyst is dibutyltin dilaurate, and the diluent is acetone.

[0032] Preferably, a preparation device for a silicate-modified polyurethane material for coal rock reinforcement comprises an outer cylinder of the preparation device, a temperature control component is installed inside the outer cylinder of the preparation device, the temperature control component comprises a bendable shrink cylinder, an annular pressure plate is fixedly connected to the top end of the bendable shrink cylinder, the annular pressure plate is slidably connected to the inner wall of the outer cylinder of the preparation device, and the gap between the bendable shrink cylinder and the outer cylinder of the preparation device is less than 50 microns, a hydraulic push rod is installed on the inner wall of the outer cylinder of the preparation device, and the output end of the hydraulic push rod is fixedly connected to the annular pressure plate, a guide telescopic rod is fixedly connected to the side of the annular pressure plate away from the hydraulic push rod, and the top end of the guide telescopic rod is fixed to the inner wall of the outer cylinder of the preparation device.

[0033] Preferably, a coolant inlet hose is fixedly connected to the top of the annular pressure plate, and the bottom end of the coolant inlet hose is communicated with the interlayer cavity between the bendable shrink cylinder and the outer cylinder of the preparation device.

[0034] Preferably, a mixing preparation component is provided inside the bendable shrinkable cylinder, the mixing holes are arranged in a circular array with respect to the outer wall of the mixing barrel, the bottom of the mixing barrel is evenly provided with feeding holes, and a lifting shaft passes through the feeding holes, the top end of the lifting shaft is fixedly connected to a porous filter plate, and the bottom end of the lifting shaft is fixedly connected to a floating block.

[0035] Preferably, a guide support column is provided inside the outer cylinder of the preparation device, and the bottom end of the guide support column is fixedly connected to the outer cylinder of the preparation device, a feeding assembly is installed on the top of the guide support column, a feed pipe is fixedly connected to the bottom of the outer cylinder of the preparation device, and the feed pipe is communicated with the flexible shrink cylinder.

[0036] Preferably, the feeding assembly includes a first magnetic block, and the first magnetic block is fixedly connected to the top of the mixing barrel, and the first magnetic block is slidably mounted on the outside of the guide support column. The feeding assembly also includes a spring mounted on the outside of the guide support column, the top end of the spring is fixedly connected to the guide support column, and the bottom end of the spring is fixedly connected to the second magnetic block, and the second magnetic block is slidably mounted on the outside of the guide support column, and the first magnetic block and the second magnetic block are magnetically repelling.

[0037] Preferably, the outside of the second magnetic block is fixedly connected to a lifting ring, and the top of the lifting ring is fixedly connected to a spherical blocking block, the outside of the guide support column is also fixedly connected to a storage barrel, and a delivery through hole is opened at the bottom of the storage barrel, and the spherical blocking block corresponds one-to-one to the delivery through hole.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. The silicate-modified polyurethane material for coal rock reinforcement proposed in the present invention is a polyurethane material generated by the silicate base of component A and the polymerized MDI of component B. It takes into account the stability of inorganic materials and the flexibility of organic materials, can not only fit the rough and porous surface of the coal rock to achieve full penetration, but also can adapt to the subsequent slight deformation of the coal rock. The reinforcement effect is more reliable, and the loose and broken coal rock can be cemented into a continuous and complete consolidated body, which greatly enhances the strength and integrity of the coal rock itself, so that it can better resist the stress changes caused by underground mining operations, prevent catastrophic accidents such as roof breakage and roof collapse caused by rock instability, and create a safer working environment for miners. The material fills the cracks in the coal rock, readjusts the internal stress distribution of the coal rock, disperses the concentrated stress, reduces the risk of sudden rock collapse caused by excessive local stress, and maintains the long-term stability of engineering structures such as underground tunnels and mining sites.

[0040] 2. In the silicate modified polyurethane material preparation device for coal rock reinforcement proposed by the present invention, the coolant is not fed in and discharged at the same time, so as to ensure the uniform temperature in the entire heat dissipation cavity and prevent uneven heat dissipation caused by heat absorption by the flow of the coolant. In addition, the solid impurities generated by the premix can be trapped inside the mixing barrel during the lifting process to prevent them from mixing with the subsequently prepared materials, so as to ensure the quality of the prepared materials. The successive additions cooperate with the liquid flow disturbance to enhance the mixing effect, promote more complete contact and fusion of the A and B components at the microscopic level, ensure the uniformity of the final material, avoid agglomeration, integrate the heat dissipation, mixing, feeding and other functions into one, make full use of limited space, reduce the equipment footprint, and are suitable for relatively cramped working environments such as underground coal mines, and are conducive to rapid on-site construction and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic cross-sectional structure diagram of the overall mixing preparation component of the preparation device of the present invention in a lowered state;

[0042] Figure 2 It is a schematic cross-sectional structure diagram of the overall mixing preparation component of the preparation device of the present invention in a raised state;

[0043] Figure 3 It is a schematic diagram of the overall three-dimensional structure of the preparation device of the present invention;

[0044] Figure 4 It is a schematic cross-sectional structure diagram of the temperature control component part of the preparation device of the present invention;

[0045] Figure 5 It is a schematic cross-sectional structure diagram of the mixing preparation component part of the preparation device of the present invention;

[0046] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at A in the middle;

[0047] Figure 7 It is a schematic diagram of the cross-sectional structure of the feeding component part of the preparation device of the present invention.

[0048] In the figure: 1. outer cylinder of the preparation device; 2. temperature control component; 3. mixing preparation component; 4. feeding component; 5. feeding pipe; 6. guide support column; 201. bendable shrink cylinder; 202. annular pressure plate; 203. hydraulic push rod; 204. guide telescopic rod; 205. coolant inlet hose; 206. outlet hose; 301. mixing barrel; 302. mixing through hole; 303. unloading through hole; 304. lifting shaft; 305. hole filter plate; 306. floating block; 401. first magnetic block; 402. storage barrel; 403. spring; 404. second magnetic block; 405. lifting ring; 406. spherical block; 407. feeding through hole. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Embodiment 1

[0051] The silicate modified polyurethane material for coal rock reinforcement comprises the following components in parts by weight:

[0052] 40 parts of silicate salts;

[0053] 15 parts of organic plasticizer;

[0054] 5 parts of surfactant;

[0055] 10 parts of active hydroxyl organic small molecules;

[0056] 30 parts of deionized water;

[0057] PolyMDI 80 parts;

[0058] 5 parts of antioxidants;

[0059] 1 part of catalyst;

[0060] 14 parts of diluent;

[0061] The preparation method of silicate modified polyurethane material for coal rock reinforcement comprises the following steps:

[0062] S1: First, pour the calculated amount of silicate salt into a reaction kettle filled with an appropriate amount of deionized water, start stirring, set the speed at 400 rpm, and continue stirring for 25 minutes until the salt is completely dissolved to form a clear solution;

[0063] S2: Under continuous stirring, slowly add the organic plasticizer dropwise for 10 minutes, then add the surfactant for 5 minutes, and finally add the active hydroxyl organic small molecule for 5 minutes, keeping the stirring speed unchanged throughout the process;

[0064] S3: After the addition of the additive, continue stirring for 40 minutes to allow the components to fully mix and react to form a uniform and stable solution, and filter with a filter with a pore size of 180 mesh to remove undissolved impurities to obtain a standby component A;

[0065] S4: In a nitrogen-purged, light-protected reactor, first add polymerized MDI, then slowly add antioxidant, catalyst and diluent in sequence, with an interval of 3 minutes between each addition. After the addition is completed, start stirring at a speed of 300 rpm, while maintaining the temperature in the reactor at 30° C., and stir for 40 minutes until all ingredients are evenly mixed to obtain component B;

[0066] S5: extracting component A and component B in a volume ratio of 1:1, and putting them into a silicate-modified polyurethane material preparation device for mixing and preparation;

[0067] The steps for mixing component A and component B in S5 are as follows:

[0068] S51: Component B is fed into the interior of the bendable shrinkable cylinder 201 through the feed pipe 5. The outer sleeve of the bendable shrinkable cylinder 201 is provided with the outer cylinder 1 of the preparation device, and the bottom end of the bendable shrinkable cylinder 201 is fixedly connected to the interior of the outer cylinder 1 of the preparation device. A hydraulic push rod 203 is installed on the inner wall of the outer cylinder 1 of the preparation device. The output end of the hydraulic push rod 203 drives the annular pressing plate 202 to move up and down, and drives the top end of the bendable shrinkable cylinder 201 to move up and down, so as to compress or stretch the bendable shrinkable cylinder 201.

[0069] S52: When the bendable shrinkable tube 201 is in a compressed state, the compression of the bendable shrinkable tube 201 drives the mixing preparation component 3 to move upward, the mixing preparation component 3 includes a mixing barrel 301, the bendable shrinkable tube 201 is in contact with the mixing barrel 301, and the mixing barrel 301 is sleeved on the outer surface of the guide support column 6. When the mixing barrel 301 rises upward along the guide support column 6, the feeding component 4 fixed on the top of the guide support column 6 is triggered, and the A component is added into the mixing barrel 301;

[0070] S53: When the bendable shrinkable tube 201 is in a stretched state, the mixing barrel 301 and the bendable shrinkable tube 201 are separated, and the mixing barrel 301 descends under the action of gravity, and the component B inside the bendable shrinkable tube 201 is poured into the mixing barrel 301 through the mixing through hole 302 opened on the outer wall of the mixing barrel 301, and the component A and the component B are mixed. Then the mixing barrel 301 rises, and the mixed component A and component B flow from the perforated filter plate 305 set at the bottom of the mixing barrel 301 to the inside of the bendable shrinkable tube 201;

[0071] S54: At the same time, the condensed water on the outside of the bendable shrink tube 201 can bring out the heat generated by the mixing reaction of component A and component B.

[0072] In S54, when the bendable shrink tube 201 is stretched, the volume of the interlayer cavity increases, and the condensed water enters the interlayer cavity through the coolant inlet hose 205, and exchanges heat with the mixed liquid of component A and component B inside the bendable shrink tube 201. When the bendable shrink tube 201 is compressed, the volume of the interlayer cavity decreases, and the condensed water inside it that has absorbed heat flows outward through the liquid outlet hose 206 to the connected chiller, and after being cooled by the chiller, it flows into the interlayer cavity through the coolant inlet hose 205, forming a cycle.

[0073] Silicate salts are a mixture of sodium silicate and potassium silicate in a ratio of 1:1.

[0074] The organic plasticizer is dibutyl phthalate, the surfactant is sodium dodecylbenzene sulfonate, the active hydroxyl organic small molecule is propylene glycol, the antioxidant is a hindered phenol antioxidant, the catalyst is dibutyltin dilaurate, and the diluent is acetone.

[0075] In this embodiment, the polymerized MDI content is high, the cross-linking network is dense, the material strength and rigidity are excellent, it can withstand high stress, the curing speed is moderate, and it is conducive to the steady progress of the complex construction process. Deionized water accounts for a large proportion, and the system is thin. Under the action of surfactants, it is easier to penetrate into tiny cracks, which is suitable for deep coal mining. This type of scene often faces high stress, and has extremely high requirements on material strength. In addition, the construction scale is large and the steps are complicated. The moderate curing speed facilitates the construction personnel to operate finely, and is also suitable for coal rock masses with finely developed cracks and the need for deep penetration reinforcement, as well as reinforcement projects with conventional storage and use cycles.

[0076] Embodiment 2

[0077] The silicate modified polyurethane material for coal rock reinforcement comprises the following components in parts by weight:

[0078] Silicate salts 55 parts;

[0079] 15 parts of organic plasticizer;

[0080] 5 parts of surfactant;

[0081] 5 parts of active hydroxyl organic small molecules;

[0082] 20 parts of deionized water;

[0083] PolyMDI 73 parts;

[0084] 5 parts of antioxidants;

[0085] 2 parts of catalyst;

[0086] 20 parts of diluent;

[0087] The preparation method of silicate modified polyurethane material for coal rock reinforcement comprises the following steps:

[0088] S1: First, pour the calculated amount of silicate salt into a reaction kettle filled with an appropriate amount of deionized water, start stirring, set the speed at 400 rpm, and continue stirring for 25 minutes until the salt is completely dissolved to form a clear solution;

[0089] S2: Under continuous stirring, slowly add the organic plasticizer dropwise for 10 minutes, then add the surfactant for 5 minutes, and finally add the active hydroxyl organic small molecule for 5 minutes, keeping the stirring speed unchanged throughout the process;

[0090] S3: After the addition of the additive, continue stirring for 40 minutes to allow the components to fully mix and react to form a uniform and stable solution, and filter with a filter with a pore size of 180 mesh to remove undissolved impurities to obtain a standby component A;

[0091] S4: In a nitrogen-purged, light-protected reactor, first add polymerized MDI, then slowly add antioxidant, catalyst and diluent in sequence, with an interval of 3 minutes between each addition. After the addition is completed, start stirring at a speed of 300 rpm, while maintaining the temperature in the reactor at 30° C., and stir for 40 minutes until all ingredients are evenly mixed to obtain component B;

[0092] S5: extracting component A and component B in a volume ratio of 1:1, and putting them into a silicate-modified polyurethane material preparation device for mixing and preparation;

[0093] The steps for mixing component A and component B in S5 are as follows:

[0094] S51: Component B is fed into the interior of the bendable shrinkable cylinder 201 through the feed pipe 5. The outer sleeve of the bendable shrinkable cylinder 201 is provided with the outer cylinder 1 of the preparation device, and the bottom end of the bendable shrinkable cylinder 201 is fixedly connected to the interior of the outer cylinder 1 of the preparation device. A hydraulic push rod 203 is installed on the inner wall of the outer cylinder 1 of the preparation device. The output end of the hydraulic push rod 203 drives the annular pressing plate 202 to move up and down, and drives the top end of the bendable shrinkable cylinder 201 to move up and down, so as to compress or stretch the bendable shrinkable cylinder 201.

[0095] S52: When the bendable shrinkable tube 201 is in a compressed state, the compression of the bendable shrinkable tube 201 drives the mixing preparation component 3 to move upward, the mixing preparation component 3 includes a mixing barrel 301, the bendable shrinkable tube 201 is in contact with the mixing barrel 301, and the mixing barrel 301 is sleeved on the outer surface of the guide support column 6. When the mixing barrel 301 rises upward along the guide support column 6, the feeding component 4 fixed on the top of the guide support column 6 is triggered, and the A component is added into the mixing barrel 301;

[0096] S53: When the bendable shrinkable tube 201 is in a stretched state, the mixing barrel 301 and the bendable shrinkable tube 201 are separated, and the mixing barrel 301 descends under the action of gravity, and the component B inside the bendable shrinkable tube 201 is poured into the mixing barrel 301 through the mixing through hole 302 opened on the outer wall of the mixing barrel 301, and the component A and the component B are mixed. Then the mixing barrel 301 rises, and the mixed component A and component B flow from the perforated filter plate 305 set at the bottom of the mixing barrel 301 to the inside of the bendable shrinkable tube 201;

[0097] S54: At the same time, the condensed water on the outside of the bendable shrink tube 201 can bring out the heat generated by the mixing reaction of component A and component B.

[0098] In S54, when the bendable shrink tube 201 is stretched, the volume of the interlayer cavity increases, and the condensed water enters the interlayer cavity through the coolant inlet hose 205, and exchanges heat with the mixed liquid of component A and component B inside the bendable shrink tube 201. When the bendable shrink tube 201 is compressed, the volume of the interlayer cavity decreases, and the condensed water inside it that has absorbed heat flows outward through the liquid outlet hose 206 to the connected chiller, and after being cooled by the chiller, it flows into the interlayer cavity through the coolant inlet hose 205, forming a cycle.

[0099] Silicate salts are a mixture of sodium silicate and potassium silicate in a ratio of 1:1.

[0100] The organic plasticizer is dibutyl phthalate, the surfactant is sodium dodecylbenzene sulfonate, the active hydroxyl organic small molecule is propylene glycol, the antioxidant is a hindered phenol antioxidant, the catalyst is dibutyltin dilaurate, and the diluent is acetone.

[0101] In this embodiment, due to the slightly lower amount of polymerized MDI and the high proportion of silicate salts, the strength is slightly weaker, but the toughness is better, it is more suitable for the micro-expansion and contraction of coal rock, and the catalyst content is relatively high, it solidifies quickly, and can quickly form a stable structure. There is less deionized water and the system is thick, which is suitable for coal rock with larger pores. It tends to form a thick reinforcement layer on the surface, which is more suitable for rapid rescue operations to cope with sudden coal rock crushing and collapse. It can quickly stabilize the rock mass by virtue of its rapid solidification characteristics. It is also suitable for coal rock with frequent micro-vibrations and deformations in daily life, and its better flexibility is used to maintain the reinforcement effect. At the same time, it is more effective in reinforcing coal rock with slightly larger pores. In the long run, it has a slight advantage in anti-oxidation and can reduce the frequency of replacement of reinforcement materials due to aging.

[0102] Embodiment 3

[0103] like Figures 1 to 7As shown, a preparation device for a silicate-modified polyurethane material for coal rock reinforcement comprises an outer cylinder 1 of the preparation device, a temperature control component 2 is installed inside the outer cylinder 1 of the preparation device, and the temperature control component 2 comprises a bendable shrinkable cylinder 201, and an annular pressing plate 202 is fixedly connected to the top of the bendable shrinkable cylinder 201, and the annular pressing plate 202 is slidably connected to the inner wall of the outer cylinder 1 of the preparation device, and the gap between the bendable shrinkable cylinder 201 and the outer cylinder 1 of the preparation device is less than 50 microns, and the inner wall of the outer cylinder 1 of the preparation device is installed There is a hydraulic push rod 203, and the output end of the hydraulic push rod 203 is fixedly connected to the annular pressure plate 202. The side of the annular pressure plate 202 away from the hydraulic push rod 203 is fixedly connected with a guide telescopic rod 204, and the top of the guide telescopic rod 204 is fixed to the inner wall of the outer cylinder 1 of the preparation device. The top of the annular pressure plate 202 is fixedly connected with a coolant inlet hose 205, and the bottom end of the coolant inlet hose 205 is connected to the interlayer cavity between the bendable shrink cylinder 201 and the outer cylinder 1 of the preparation device.

[0104] The output end of the hydraulic push rod 203 carries the annular pressing plate 202 to perform an up-and-down lifting movement, and then carries the annular pressing plate 202 to perform a stretching or compressing movement. The annular pressing plate 202 on the other side is used to limit the annular pressing plate 202 to prevent the annular pressing plate 202 from being deflected when only one side is subjected to force during the up-and-down movement. When the annular pressing plate 202 moves upward and the bendable shrink tube 201 is in a stretched state, the volume of the interlayer cavity between the bendable shrink tube 201 and the outer tube 1 of the preparation device becomes larger, and the coolant is transported into the interlayer cavity through the coolant inlet hose 205, so as to prepare the inner part of the bendable shrink tube 201. The material is cooled, and the bendable shrink tube 201 with a wavy bending design can effectively increase the heat dissipation area. When the annular pressure plate 202 moves downward and the bendable shrink tube 201 is in a compressed state, most of the coolant inside the interlayer cavity is discharged outward through the liquid outlet hose 206. During the next stretching, the coolant enters again to form a cycle. The liquid inlet and liquid outlet processes are not carried out at the same time. The coolant enters together and is discharged together, so as to ensure the uniformity of the temperature in the entire heat dissipation cavity as much as possible and prevent the coolant from gradually absorbing heat in the process of flowing from the liquid inlet to the liquid outlet, resulting in uneven heat dissipation.

[0105] A feed pipe 5 is fixedly connected to the bottom of the outer cylinder 1 of the preparation device, and the feed pipe 5 is in communication with the bendable shrinkable cylinder 201 . The feed pipe 5 is used to transport the B component solution into the interior of the bendable shrinkable cylinder 201 .

[0106] A mixing preparation component 3 is arranged inside the bendable shrinkable cylinder 201, and mixing holes 302 are arranged in a circular array with respect to the outer wall of the mixing barrel 301. Feeding holes 303 are evenly opened at the bottom of the mixing barrel 301, and a lifting shaft 304 passes through the feeding holes 303. A perforated filter plate 305 is fixedly connected to the top end of the lifting shaft 304, and a floating block 306 is fixedly connected to the bottom end of the lifting shaft 304.

[0107] When the bendable shrink tube 201 is stretched, the mixing barrel 301 is in a descending state without contact with the bendable shrink tube 201, and is immersed in the component B solution inside the bendable shrink tube 201. The component B solution flows into the mixing barrel 301 through the mixing through hole 302. When the bendable shrink tube 201 is contracted, the inner wall of the bendable shrink tube 201 protrudes inward to squeeze the mixing barrel 301, and the mixing barrel 301 is lifted up along the inclined outer wall of the mixing barrel 301. At the same time, the top of the mixing barrel 301 triggers the feeding component 4, and the component A inside the feeding component 4 is added into the mixing barrel 301, and mixed with the component A inside the mixing barrel 301. Component B is premixed and then sprinkled downward into the interior of the flexible shrink tube 201 through the holes in the porous filter plate 305. The porous filter plate 305 has a filtering function, which can intercept the solid impurities generated by the premix and add the A component into the mixing barrel 301 to continue mixing with the remaining B component solution inside it. The lifting and lowering process is repeated, and a certain amount of A component solution is gradually added each time the lifting and lowering is performed until all the A component solution and the B component solution are completely added and mixed. Each time the mixing barrel 301 is lifted and lowered, a liquid flow disturbance can be formed inside the flexible shrink tube 201, thereby further improving the mixing efficiency.

[0108] A guide support column 6 is provided inside the outer cylinder 1 of the preparation device, and the bottom end of the guide support column 6 is fixedly connected to the outer cylinder 1 of the preparation device, and a feeding assembly 4 is installed on the top of the guide support column 6, and the feeding assembly 4 includes a first magnetic block 401, and the first magnetic block 401 is fixedly connected to the top of the mixing barrel 301, and the first magnetic block 401 is slidably sleeved on the outside of the guide support column 6, and the feeding assembly 4 also includes a spring 403 sleeved on the outside of the guide support column 6, and the top end of the spring 403 is fixedly connected to the guide support column 6, and The bottom end of the spring 403 is fixedly connected to the second magnetic block 404, and the second magnetic block 404 is slidably mounted on the outside of the guide support column 6. The first magnetic block 401 and the second magnetic block 404 are magnetically repelling. The outside of the second magnetic block 404 is fixedly connected to a lifting ring 405, and the top of the lifting ring 405 is fixedly connected to a spherical blocking block 406. The outside of the guide support column 6 is also fixedly connected to a storage barrel 402, and a delivery through hole 407 is opened at the bottom of the storage barrel 402, and the spherical blocking block 406 corresponds one-to-one to the delivery through hole 407.

[0109] Under the action of spring 403, second magnetic block 404 and lifting ring 405 are pressed downward, so that spherical block 406 is inserted into the inside of delivery hole 407 to seal it. When mixing barrel 301 moves upward with first magnetic block 401 and first magnetic block 401 approaches second magnetic block 404, due to the magnetic repulsion between the two, second magnetic block 404 will move upward, and at the same time, lifting ring 405 will move spherical block 406 upward, so that spherical block 406 is separated from delivery hole 407, and component A solution in storage barrel 402 can drip downward through delivery hole 407 to the inside of mixing barrel 301 for premixing.

[0110] It should be noted that, in the description of the present application, it should be understood that the terms "length", "thickness", "inside", "outside", "axial", "radial", etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0111] In addition, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises", 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.

[0112] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A silicate-modified polyurethane material for coal rock reinforcement, characterized in that: The composition includes the following components in parts by weight: 40-60 parts of silicate salts; 10-15 parts of organic plasticizer; 2-5 parts of surfactant; 5-10 parts of active hydroxyl organic small molecules; 10-30 parts of deionized water; Polymeric MDI 70-85 parts; 2-5 parts of antioxidants; Catalyst 0.5-2 parts; 10-20 parts of diluent; The preparation method of silicate modified polyurethane material for coal rock reinforcement comprises the following steps: S1: first pour the calculated amount of silicate salt into a reaction kettle filled with an appropriate amount of deionized water, start stirring, set the speed to 300-500 rpm, and continue stirring for 20-30 minutes until the salt is completely dissolved to form a clear solution; S2: Under continuous stirring, slowly dropwise add organic plasticizer for 5-10 minutes, then add surfactant for 3-5 minutes, and finally add active hydroxyl organic small molecules for 3-5 minutes, keeping the stirring speed unchanged throughout the process; S3: After the addition of the additive, continue stirring for 30-45 minutes to allow the components to fully mix and react to form a uniform and stable solution, and filter with a filter with a mesh size of 100-200 mesh to remove undissolved impurities to obtain a standby component A; S4: In a nitrogen-purged, light-protected reactor, first add polymeric MDI, then slowly add antioxidant, catalyst and diluent in sequence, with an interval of 3-5 minutes between each addition. After the addition is completed, start stirring at a speed of 200-400 rpm, while maintaining the temperature in the reactor at 25-35° C., and stir for 30-45 minutes until the ingredients are evenly mixed to obtain component B; S5: extracting component A and component B in a volume ratio of 1:1, and putting them into a silicate-modified polyurethane material preparation device for mixing and preparation; The steps for mixing component A and component B in S5 are as follows: S51: Component B is fed into the interior of the bendable shrinkable cylinder (201) through the feed pipe (5); the outer sleeve of the bendable shrinkable cylinder (201) is provided with an outer cylinder (1) of the preparation device, and the bottom end of the bendable shrinkable cylinder (201) is fixedly connected to the interior of the outer cylinder (1) of the preparation device; a hydraulic push rod (203) is installed on the inner wall of the outer cylinder (1) of the preparation device; the output end of the hydraulic push rod (203) drives the annular pressing plate (202) to move up and down, drives the top end of the bendable shrinkable cylinder (201) to move up and down, and compresses or stretches the bendable shrinkable cylinder (201); S52: When the bendable shrinkable tube (201) is in a compressed state, the compression of the bendable shrinkable tube (201) drives the mixing preparation component (3) to move upward, the mixing preparation component (3) includes a mixing barrel (301), the bendable shrinkable tube (201) and the mixing barrel (301) are in contact, and the mixing barrel (301) is sleeved on the outer surface of the guide support column (6). When the mixing barrel (301) rises upward along the guide support column (6), the feeding component (4) fixed on the top of the guide support column (6) is triggered, and component A is added into the mixing barrel (301); S53: When the bendable shrinkable tube (201) is in a stretched state, the mixing barrel (301) and the bendable shrinkable tube (201) are separated, and the mixing barrel (301) descends under the action of gravity. The component B inside the bendable shrinkable tube (201) is poured into the mixing barrel (301) through the mixing through hole (302) provided on the outer wall of the mixing barrel (301), and the component A and the component B are mixed. Then, the mixing barrel (301) rises, and the mixed component A and component B flow from the perforated filter plate (305) provided at the bottom of the mixing barrel (301) into the bendable shrinkable tube (201); S54: At the same time, the condensed water outside the bendable shrink tube (201) can bring out the heat generated by the mixing reaction of component A and component B.

2. The silicate-modified polyurethane material for coal rock reinforcement according to claim 1, characterized in that: In S54, when the bendable shrink tube (201) is stretched, the volume of the interlayer cavity increases, and condensed water enters the interlayer cavity through the coolant inlet hose (205), and performs heat exchange with the mixed liquid of component A and component B inside the bendable shrink tube (201). When the bendable shrink tube (201) is compressed, the volume of the interlayer cavity decreases, and the condensed water inside the interlayer cavity that has absorbed heat flows outward through the liquid outlet hose (206) to the connected chiller, and after being cooled by the chiller, it flows into the interlayer cavity through the coolant inlet hose (205), forming a cycle.

3. The silicate-modified polyurethane material for coal rock reinforcement according to claim 1, characterized in that: The silicate salts are prepared by mixing sodium silicate and potassium silicate in a ratio of 1:

1.

4. The silicate-modified polyurethane material for coal rock reinforcement according to claim 1, characterized in that: The organic plasticizer is dibutyl phthalate, the surfactant is sodium dodecylbenzene sulfonate, the active hydroxyl organic small molecule is propylene glycol, the antioxidant is a hindered phenol antioxidant, the catalyst is dibutyltin dilaurate, and the diluent is acetone.

5. The device for preparing the silicate-modified polyurethane material for coal and rock reinforcement according to any one of claims 1 to 4, characterized in that: The invention comprises an outer cylinder (1) of a preparation device, wherein a temperature control component (2) is installed inside the outer cylinder (1) of the preparation device, wherein the temperature control component (2) comprises a bendable shrinkable cylinder (201), wherein the top end of the bendable shrinkable cylinder (201) is fixedly connected to an annular pressing plate (202), wherein the annular pressing plate (202) and the inner wall of the outer cylinder (1) of the preparation device are slidably connected, and the gap between the bendable shrinkable cylinder (201) and the outer cylinder (1) of the preparation device is less than 50 microns, wherein a hydraulic push rod (203) is installed on the inner wall of the outer cylinder (1) of the preparation device, and the output end of the hydraulic push rod (203) and the annular pressing plate (202) are fixedly connected, and a guide telescopic rod (204) is fixedly connected to the side of the annular pressing plate (202) away from the hydraulic push rod (203), and the top end of the guide telescopic rod (204) is fixed to the inner wall of the outer cylinder (1) of the preparation device.

6. The device for preparing silicate-modified polyurethane material for coal rock reinforcement according to claim 5, characterized in that: A coolant inlet hose (205) is fixedly connected to the top of the annular pressure plate (202), and the bottom end of the coolant inlet hose (205) is communicated with the interlayer cavity between the bendable shrink tube (201) and the outer tube (1) of the preparation device.

7. The device for preparing silicate-modified polyurethane material for coal rock reinforcement according to claim 5, characterized in that: The interior of the bendable shrinkable cylinder (201) is provided with a mixing preparation component (3), the mixing through holes (302) are arranged in a ring array with respect to the outer wall of the mixing barrel (301), the bottom of the mixing barrel (301) is evenly provided with material discharge through holes (303), and a lifting shaft (304) passes through the interior of the material discharge through holes (303), the top end of the lifting shaft (304) is fixedly connected to a perforated filter plate (305), and the bottom end of the lifting shaft (304) is fixedly connected to a floating block (306).

8. The device for preparing silicate-modified polyurethane material for coal rock reinforcement according to claim 5, characterized in that: A guide support column (6) is arranged inside the outer cylinder (1) of the preparation device, and the bottom end of the guide support column (6) is fixedly connected to the outer cylinder (1) of the preparation device, a feeding assembly (4) is installed at the top end of the guide support column (6), and a feed pipe (5) is fixedly connected to the bottom of the outer cylinder (1) of the preparation device, and the feed pipe (5) is connected to the bendable shrink cylinder (201).

9. The device for preparing silicate-modified polyurethane material for coal and rock reinforcement according to claim 5, characterized in that: The feeding assembly (4) comprises a first magnetic block (401), and the first magnetic block (401) is fixedly connected to the top of the mixing barrel (301), and the first magnetic block (401) is slidably mounted on the outside of the guide support column (6). The feeding assembly (4) also comprises a spring (403) mounted on the outside of the guide support column (6), the top end of the spring (403) is fixedly connected to the guide support column (6), and the bottom end of the spring (403) is fixedly connected to the second magnetic block (404), and the second magnetic block (404) is slidably mounted on the outside of the guide support column (6), and the first magnetic block (401) and the second magnetic block (404) are magnetically repelling.

10. The device for preparing silicate-modified polyurethane material for coal and rock reinforcement according to claim 9, characterized in that: The outside of the second magnetic block (404) is fixedly connected to a lifting ring (405), and the top of the lifting ring (405) is fixedly connected to a spherical blocking block (406). The outside of the guide support column (6) is also fixedly connected to a material storage barrel (402), and a delivery through hole (407) is provided at the bottom of the material storage barrel (402), and the spherical blocking block (406) corresponds one-to-one to the delivery through hole (407).

Images