Polyurethane cold vulcanization belt repair adhesive and preparation and application method thereof

Abstract

The application discloses a kind of mine polyurethane cold vulcanization conveying belt quick repair adhesive and its preparation method and application, belong to conveying belt normal temperature normal pressure repair technical field.The adhesive includes primer glue solution and two-component surface coating glue solution.Primer glue solution includes castor oil, diisocyanate, hydroxyethyl methacrylate etc., surface coating glue solution A component contains active hydrogen compound, polyether polyol, carbon fiber etc., B component contains polytetrahydrofuran ether diol, liquefied MDI etc.When preparing, respectively prepare primer, A component and B component, when using, first brush primer, then A, B component are mixed according to volume ratio 1:1 after coating and pouring.The application is by -NCO and active hydrogen reaction and vinyl double bond and rubber surface double bond radical polymerization, realize adhesive and conveying belt chemical bonding, significantly improve bonding strength, peel strength is greater than or equal to 126N / cm.The adhesive solidification is fast, strength is high, construction is simple, suitable for coal mine underground conveying belt on-site quick repair, with environmental protection, flame retardant, antistatic and other advantages.

Description

Technical Field

[0001] This invention belongs to the technical field of fast repair adhesives for conveyor belts at room temperature and pressure, and particularly relates to a fast repair adhesive for cold vulcanized polyurethane conveyor belts used in mining, its preparation method, and its application. Background Technology

[0002] Conveyor belts, as a modern means of transportation in mining, are widely used in coal mining and other fields. However, due to various factors such as operating environment, vulcanization process, and daily maintenance level, the rubber base of conveyor belts often suffers damage. Therefore, timely on-site repair of damaged conveyor belts is of great significance for improving production efficiency and the efficient utilization of equipment.

[0003] When conveyor belts are damaged, they are typically repaired using mechanical clamping or patching methods. Mechanical clamping reduces the strength of the joint, shortening the overall lifespan of the conveyor belt, and the belt often breaks at the clamping point, causing the conveyor to malfunction. Patching requires peeling and smoothing the damaged or torn areas, inevitably cutting away portions of the conveyor belt's rubber layer and core, further reducing its lifespan, and the process is more complex.

[0004] Furthermore, some existing chemical repair materials also have significant limitations. For example, the epoxy resin-based repair adhesive disclosed in patent CN117402578A has a long curing time and insufficient mechanical properties, making it difficult to meet the needs of rapid downhole repairs. Patent CN113201114A relates to a two-component polyurethane cold patch adhesive, which is convenient to use and cures quickly, but its adhesion mainly relies on the reaction of the polyurethane's own groups, failing to form chemical bonds with the rubber substrate, resulting in low final peel strength. Similarly, the repair adhesive described in patent CN105802571A also fails to achieve chemical bonding with the rubber substrate, and its bond-peel strength is also unsatisfactory.

[0005] In summary, existing repair technologies generally suffer from insufficient repair strength, complex processes that damage the substrate, slow curing speed, and, in particular, a lack of strong chemical bonding between the repair material and the rubber conveyor belt. There is an urgent need to develop a special adhesive that can achieve rapid, high-strength, and on-site repair. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing conveyor belt repair technologies: mechanical snap-fit ​​methods reduce joint strength and cause the conveyor belt to easily break at the snap-fit ​​point; patching methods require the removal of part of the adhesive layer and belt core, damaging the conveyor belt body and involving complex processes; and existing cold repair adhesives generally have long curing times and insufficient mechanical properties, especially lacking chemical bonding with the rubber conveyor belt substrate, resulting in unsatisfactory bond-peel strength, making it difficult to meet the requirements of efficient, high-strength, and rapid repair in coal mines. Therefore, this invention proposes a rapid repair adhesive for mine-use polyurethane cold vulcanized conveyor belts, its preparation method, and its application.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A quick-repair adhesive for cold-vulcanized polyurethane conveyor belts used in mining includes a base coat and a top coat composed of component A and component B; both the base coat and the top coat are measured in parts by weight.

[0009] The primer adhesive comprises the following components:

[0010] Castor oil 107-111 parts, 4,4'-diphenylmethane diisocyanate 95-100 parts, hydroxyethyl methacrylate 13-15 parts, solvent oil 47-50 parts, latent curing agent 0.6-1.0 parts, defoamer 0.4-0.7 parts;

[0011] Component A of the surface coating liquid includes the following components:

[0012] 11-12 parts of 3,3'-dichloro-4,4'-diaminodiphenylmethane, 1-2 parts of trimethylolpropane, 4-5 parts of diethyltoluenediamine, 29-31 parts of N210 type polyether polyol, 16-18 parts of N220 type polyether polyol, 3-5 parts of N305 type polyether polyol, 31-33 parts of flame retardant, 0.6-0.9 parts of black paste, 2-3 parts of antistatic agent, 0.8-1.0 parts of defoamer, 0.1-0.2 parts of T15 type catalyst, 0.9-1.0 parts of carbon fiber short filament, 0.3-0.5 parts of N,N-dimethylaniline, and 0.2-0.3 parts of tetramethylethylenediamine;

[0013] Component B of the surface coating liquid includes the following components:

[0014] 46-48 parts of polytetrahydrofuran ether diol, 53-55 parts of liquefied MDI-100L, 4-5 parts of flame retardant, 0.8-1.0 parts of benzoyl peroxide, and 0.6-0.9 parts of black paste;

[0015] The castor oil mentioned is Grade A castor oil, a commercially available industrial product.

[0016] The 4,4'-diphenylmethane diisocyanate is an industrial product with a -NCO content of 33.6% by mass, produced by Shandong Yantai Wanhua Chemical Group.

[0017] The hydroxyethyl methacrylate is a commercially available industrial product.

[0018] The solvent oil is a mixture of tris(2-chloroethyl) phosphate, aromatic oil, and naphthenic oil in a mass ratio of 1:2:1; the aromatic oil is produced by Pengchen New Material Technology Co., Ltd.

[0019] The naphthenic oil is KN4016 type naphthenic oil, a commercially available industrial product.

[0020] The latent curing agent is YRLH-1106 type latent curing agent, produced by Guangzhou Yourun Synthetic Materials Co., Ltd.

[0021] The 3,3'-dichloro-4,4'-diaminodiphenylmethane is a commercially available ordinary grade II.

[0022] The trimethylolpropane is a commercially available industrial grade.

[0023] The diethyltoluenediamine is a commercially available industrial grade.

[0024] The N210 type polyether polyol, N220 type polyether polyol, and N305 type polyether polyol are all commercially available industrial products.

[0025] The flame retardant is one of dimethyl methylphosphonate or tris(2-chloroethyl) phosphate, a commercially available industrial product;

[0026] The black paste is an oil-based conductive carbon black paste, produced by Suzhou Aolaixin Building Materials Co., Ltd.

[0027] The antistatic agent is selected from CUCE-W type antistatic agent, JLWT-1 type antistatic agent or E-6019AR antistatic agent, and is produced by Guangzhou Yourun Synthetic Materials Co., Ltd., Shandong Juli Antistatic Technology Co., Ltd. or Dongguan Fiat Antistatic Technology Co., Ltd., respectively.

[0028] The defoamer is selected from YPXP-07A type defoamer, BYK-1790 type defoamer or BYK-1799 type defoamer, and is distributed by Guangzhou Yourun Synthetic Materials Co., Ltd. or BYK S.A. of Germany, respectively.

[0029] The T15 catalyst is a delayed catalyst, produced by Shandong Lanyue New Material Technology Co., Ltd.

[0030] The carbon fiber short filaments have a length of 0.3mm to 0.5mm, and the precursor fiber is T800 type produced by Shanxi Coal Chemistry Research Institute;

[0031] The N,N-dimethylaniline and tetramethylethylenediamine mentioned are commercially available industrial products;

[0032] The polytetrahydrofuran ether diol is a commercially available industrial product with a relative molecular mass of 1000.

[0033] The liquefied MDI-100L has an -NCO content of 28% to 30% and is produced by Yantai Wanhua Chemical Group.

[0034] The benzoyl peroxide is chemically pure and a commercially available product.

[0035] The preparation method of the quick-repair adhesive for mining polyurethane cold vulcanized conveyor belts includes the following steps:

[0036] Step 1: Preparation of primer adhesive

[0037] 107-111 parts of castor oil were added to a reactor equipped with a vacuum system and dehydrated for 2 hours at 120°C and 0.09 MPa vacuum. After dehydration, 95-100 parts of 4,4'-diphenylmethane diisocyanate were added, and the reaction was carried out at 80°C ± 2°C for 2 hours. Then, 13-15 parts of hydroxyethyl methacrylate were added dropwise to the reactor, and the reaction was continued for 1 hour. After the reaction was completed, the mixture was defoamed at 0.09 MPa until it was clear, and then cooled to room temperature. Subsequently, 47-50 parts of solvent oil, 0.6-1.0 parts of latent curing agent, and 0.4-0.7 parts of defoamer were added and mixed evenly to obtain a primer. The primer was then filled and stored under high-purity nitrogen. The molar content of -NCO groups in the primer was approximately 0.13 mol / 100 parts, and the molar content of vinyl double bond groups was approximately 0.04 mol / 100 parts.

[0038] Step 2: Preparation of Component A of the Topcoat Adhesive

[0039] First, 11-12 parts of 3,3'-dichloro-4,4'-diaminodiphenylmethane and 1-2 parts of trimethylolpropane are added to 4-5 parts of diethyltoluenediamine and heated to 100-120°C to melt. Then, 29-31 parts of N210 type polyether polyol, 16-18 parts of N220 type polyether polyol, 3-5 parts of N305 type polyether polyol, and 31-33 parts of flame retardant are added to a mixer equipped with a vacuum system and heated to 100°C. Next, the molten mixture and 0.6-0.9 parts of black paste are added to the mixer, and the vacuum pump is turned on at 0°C. Dehydrate the material at 0.09 MPa and 110℃~120℃ for 2 hours; after dehydration, cool the material to below 25℃; finally, add 2 to 3 parts of antistatic agent, 0.8 to 1.0 parts of defoamer, 0.1 to 0.2 parts of T15 catalyst, 0.9 to 1.0 parts of carbon fiber short filaments, 0.3 to 0.5 parts of N,N-dimethylaniline and 0.2 to 0.3 parts of tetramethylethylenediamine, continue stirring and degassing for 5 to 10 minutes, dispense into galvanized metal cans, seal and store under high-purity nitrogen, to obtain component A; the active hydrogen molar content is approximately 0.25 mol / 100g;

[0040] Step 3: Preparation of Component B of the Topcoat Adhesive

[0041] Add 46-48 parts of polytetrahydrofuran ether glycol to a reactor with a vacuum system, heat to 110-120°C, and dehydrate for 2 hours at a pressure above 0.09 MPa using a vacuum pump. After dehydration, cool the material to below 50°C. Add 53-55 parts of liquefied MDI-100L, control the reaction temperature at 60±2°C and react for 40 minutes, then raise the temperature to 80±2°C and react for 2 hours. Subsequently, cool to below 25°C, add 0.6-0.9 parts of black slurry, and degas at a pressure above 0.09 MPa until no bubbles remain. Add 4-5 parts of flame retardant and 0.8-1.0 parts of benzoyl peroxide to the system, mix thoroughly to obtain component B, and store in a sealed container under nitrogen. The molar content of -NCO groups is approximately 0.26 mol / 100 parts.

[0042] Step 4: Preparation of rapid repair adhesive for mining polyurethane cold vulcanized conveyor belts

[0043] The A component obtained in the second step and the B component obtained in the third step are mixed evenly at a volume ratio of 1:1 to obtain the top coating adhesive; the top coating adhesive and the bottom coating adhesive obtained in the first step together constitute the mining polyurethane cold vulcanized conveyor belt repair adhesive.

[0044] The method for rapid repair of mining conveyor belts using the aforementioned adhesive includes the following steps:

[0045] Clean the damaged area of ​​the conveyor belt by grinding, removing contaminants and debris. Apply the primer to the damaged area with a brush, applying 5-6 coats and letting it dry for 6-9 minutes. The coated area should be larger than the damaged area.

[0046] Step 2: Quickly mix components A and B of the topcoat liquid at a volume ratio of 1:1 until evenly mixed. Use a brush to apply the mixed topcoat liquid to the area where the base coat has been applied 5 to 6 times.

[0047] The third step is to pour the remaining adhesive liquid onto the surface that has already been coated with adhesive and level it. The mixed liquid reacts and generates heat after pouring, reaching a temperature of 45℃~55℃. The adhesive liquid will solidify after 30~40 minutes, and the repair is complete.

[0048] The principle of conveyor belt repair adhesive molding in this invention

[0049] This invention relates to a rapid repair adhesive for cold-vulcanized polyurethane conveyor belts used in mining, primarily targeting the repair of conveyor belts made of chloroprene rubber, styrene-butadiene rubber, and cis-butadiene rubber used in underground coal mines. The primer contains terminal isocyanate-NCO groups and vinyl double bond groups. The topcoat primarily consists of component A, containing active hydrogen, and component B, a polyurethane prepolymer containing isocyanate-NCO groups. Components A and B also contain oxidizing agents and reducing agents / initiators, respectively. In use, the primer is first applied multiple times to the damaged rubber belt. Then, components A and B of the topcoat are mixed, and the mixed adhesive is first applied multiple times to the primer layer with a brush. Finally, the remaining A and B mixed adhesive is poured onto the primer and leveled. The mixed topcoat adhesive reacts and generates heat, reaching temperatures of 45°C to 55°C. The -NCO groups in the primer react with the active hydrogen in the topcoat, and the redox initiator in the topcoat decomposes upon heating, releasing free radicals. This initiates free radical polymerization of the vinyl double bonds in the primer and the double bonds on the surface of the chloroprene rubber, styrene-butadiene rubber, and cis-butadiene rubber substrates. After curing, the repair adhesive forms a chemical bond structure with the surface layer of the rubber conveyor belt, enhancing the repair effect. The tri(2-chloroethyl) phosphate:aromatic oil:cycloalkane oil mixture in the primer (1:2:1 ratio) improves the swelling, penetration, group reactivity, and reaction rate of the adhesive on the conveyor belt surface, enhancing the repair bonding effect. The latent curing agent in the primer prevents the isocyanate groups from reacting with moisture in the air, preventing the adhesive layer from generating CO2 gas and affecting the bonding effect. The carbon fiber short filaments in the topcoat enhance the mechanical properties of the repair adhesive layer.

[0050] Compared with the prior art, the present invention has the following advantages:

[0051] First, by utilizing the reaction of -NCO groups with active hydrogen and the valence reaction of vinyl double bonds with double bonds on the surface of rubber substrate, the present invention significantly improves the bonding strength of the adhesive to the damaged parts of the conveyor belt, so that the rubber layer and the adhesive form an integral structure with a peel strength of more than 126 N / cm.

[0052] Secondly, this invention innovatively selects N,N-dimethylaniline and tetramethylethylenediamine, giving them the dual functions of catalyzing the -NCO / active hydrogen reaction and acting as highly active reducing agents for vinyl double bonds. Under the exothermic excitation of the reactions of components A and B, they react with benzoyl peroxide to form an oxidation-oxidation-reduction initiator, generating free radicals, which initiate free radical polymerization of the double bonds in the rubber substrate and the vinyl double bonds in the primer. Simultaneously, the -NCO groups in the primer undergo hydrogen transfer polymerization with the active hydrogen in the topcoat. The synergistic effect of these two polymerization mechanisms in the same system significantly enhances the adhesive strength of the repair layer.

[0053] Third, the carbon fiber short filaments added to the topcoat effectively improve the mechanical properties of the repair adhesive layer; the specific solvent oil mixture used in the primer enhances the penetration, swelling effect and functional group reactivity of the adhesive into the conveyor belt rubber layer, thereby further improving the repair strength.

[0054] Fourth, this product does not contain small-molecule volatile organic solvents, making it environmentally friendly and green. It is also easy to apply and harmless to the health of operators.

[0055] Fifth, the rapid repair adhesive for cold-vulcanized conveyor belts in mining provided by this invention consists of a primer and a two-component polyurethane topcoat, enabling rapid cold repair. This material cures at room temperature by pouring or applying, and is suitable for on-site repair of various damages on rubber conveyor belts, such as holes, surface wear, edge wear, potholes, perforations, or tears. It cures quickly and has high bonding strength, significantly shortening repair time, ensuring continuous production, and saving maintenance costs. Especially in underground coal mine environments, this technology is simple to operate, easy to master, and does not pollute the environment, making it a promising green and rapid repair method. Detailed Implementation

[0056] Example 1

[0057] The mining polyurethane cold vulcanized conveyor belt repair adhesive described in this embodiment includes a base coat adhesive and a top coat adhesive composed of component A and component B. The base coat adhesive, component A, and component B are all measured in parts by weight. The technical solution also includes the preparation of each adhesive and the repair process of the conveyor belt.

[0058] Composition of the primer adhesive:

[0059] 107 parts castor oil, 95 parts 4,4'-diphenylmethane diisocyanate, 13 parts hydroxyethyl methacrylate, 47 parts solvent oil, 0.6 parts latent curing agent, and 0.4 parts defoamer.

[0060] Composition of component A of the topcoat liquid

[0061] 11 parts of 3,3'-dichloro-4,4'-diaminodiphenylmethane (MOCA), 1 part of trimethylolpropane, 4 parts of diethyltoluenediamine (E-100), 29 parts of N210 type polyether polyol, 16 parts of N220 type polyether polyol, 3 parts of N305 type polyether polyol, 31 parts of flame retardant, 0.6 parts of black paste, 2 parts of antistatic agent, 0.8 parts of defoamer, 0.1 parts of T15 type catalyst, 0.9 parts of carbon fiber short filament, 0.3 parts of N,N-dimethylaniline, and 0.2 parts of tetramethylethylenediamine.

[0062] Composition of component B of the topcoat liquid

[0063] 46 parts of polytetrahydrofuran ether diol, 53 parts of liquefied MDI-100L, 4 parts of flame retardant, 0.8 parts of benzoyl peroxide, and 0.6 parts of black paste.

[0064] The castor oil mentioned is Grade A castor oil, a commercially available industrial product.

[0065] The 4,4'-diphenylmethane diisocyanate is an industrial product with a -NCO content of 33.6% by mass, produced by Shandong Yantai Wanhua Chemical Group.

[0066] The hydroxyethyl methacrylate is a commercially available industrial product.

[0067] The solvent oil is a mixture of tris(2-chloroethyl) phosphate, aromatic oil, and naphthenic oil in a mass ratio of 1:2:1;

[0068] The aromatic oil was produced by Pengchen New Material Technology Co., Ltd.

[0069] The naphthenic oil is KN4016 type naphthenic oil, a commercially available industrial product.

[0070] The latent curing agent is YRLH-1106 type latent curing agent, produced by Guangzhou Yourun Synthetic Materials Co., Ltd.

[0071] The 3,3'-dichloro-4,4'-diaminodiphenylmethane is a commercially available ordinary type II.

[0072] The trimethylolpropane is a commercially available industrial grade.

[0073] The diethyltoluenediamine is a commercially available industrial grade.

[0074] The N210 type polyether polyol, N220 type polyether polyol, and N305 type polyether polyol are all commercially available industrial products.

[0075] The flame retardant is one of dimethyl methylphosphonate or tris(2-chloroethyl) phosphate flame retardants, a commercially available industrial product;

[0076] The black paste is an oil-based conductive carbon black paste, produced by Suzhou Aolaixin Building Materials Co., Ltd.

[0077] The antistatic agent is CUCE-W type antistatic agent, produced by Guangzhou Yourun Synthetic Materials Co., Ltd., or JLWT-1 type antistatic agent, produced by Shandong Juli Antistatic Technology Co., Ltd., or E-6019AR antistatic agent, produced by Dongguan Fiat Antistatic Technology Co., Ltd.

[0078] The defoamer is YPXP-07A type defoamer, produced by Guangzhou Yourun Synthetic Materials Co., Ltd., or BYK-1790 and BYK-1799 type defoamers are distributed by BYK-1790 and BYK-1799 AG of Germany.

[0079] The T15 catalyst is a delayed catalyst, produced by Shandong Lanyue New Material Technology Co., Ltd.

[0080] The carbon fiber short filaments are self-made with a length of 0.3mm to 0.5mm, and the precursor fiber is T800 produced by Shanxi Coal Chemistry Research Institute;

[0081] The N,N-dimethylaniline and tetramethylethylenediamine mentioned are commercially available industrial products;

[0082] The polytetrahydrofuran ether diol is a commercially available industrial product with a relative molecular mass of 1000.

[0083] The liquefied MDI-100L has an -NCO content of 28% to 30% and is produced by Yantai Wanhua Chemical Group.

[0084] The benzoyl peroxide is chemically pure and a commercially available product.

[0085] The specific preparation method of the mining polyurethane cold vulcanized conveyor belt repair adhesive includes the following steps:

[0086] Step 1: Preparation of primer adhesive

[0087] 107 parts of castor oil were added to a reactor equipped with a vacuum system and dehydrated at 120°C under a vacuum of 0.09 MPa for 2 hours. After dehydration, 95 parts of 4,4'-diphenylmethane diisocyanate were added to the reactor and reacted at 80°C ± 2°C for 2 hours. Then, 13 parts of hydroxyethyl methacrylate were added dropwise to the reactor and reacted for another hour. After the reaction was completed, the mixture was defoamed at 0.09 MPa until it was clear. Then, it was cooled to room temperature, and 47 parts of solvent oil, 0.6 parts of latent curing agent, and 0.4 parts of defoamer were added to the reactor. The mixture was further mixed evenly to obtain the primer, which was then filled and stored under high-purity nitrogen.

[0088] Step 2: Preparation of Component A of the Topcoat Adhesive

[0089] First, 11 parts of 3,3'-dichloro-4,4'-diaminodiphenylmethane, 1 part of trimethylolpropane, and 4 parts of diethyltoluenediamine are added and heated to 100°C–120°C to melt. Then, 29 parts of N210 type polyether polyol, 16 parts of N220 type polyether polyol, 3 parts of N305 type polyether polyol, and 31 parts of flame retardant are added to a mixer equipped with a vacuum system and heated to 100°C. Then, the molten 3,3'-dichloro-4,4'-diaminodiphenylmethane, trimethylolpropane, and diethyltoluenediamine are mixed... Add 0.6 parts of black slurry to the mixer, turn on the vacuum pump and dehydrate at 0.09 MPa and 110℃~120℃ for 2 hours. After dehydration, cool the material in the mixer to below 25℃. Finally, add 2 parts of antistatic agent, 0.8 parts of defoamer, 0.1 parts of T15 catalyst, 0.9 parts of carbon fiber short filament, 0.3 parts of N,N-dimethylaniline, and 0.2 parts of tetramethylethylenediamine to the mixer, continue stirring and degassing for 5~10 minutes, and then dispense into galvanized metal cans, seal and store with high-purity nitrogen to obtain component A.

[0090] Step 3: Preparation of Component B of the Topcoat Liquid

[0091] Add 46 parts of polytetrahydrofuran ether glycol to a reactor equipped with a vacuum system. Heat to 110–120°C and dehydrate for 2 hours at a pressure above 0.09 MPa using a vacuum pump. After dehydration, cool the material to below 50°C. Then add 53 parts of liquefied MDI-100L and react at 60±2°C for 40 minutes. Then heat to 80±2°C and react for 2 hours. Cool to below 25°C and add 0.6 parts of black paste. Degas at a pressure above 0.09 MPa using a vacuum pump. Degassing is complete when no bubbles remain in the material. Add 4 parts of flame retardant and 0.8 parts of benzoyl peroxide to the system and mix thoroughly to obtain component B. Then, seal and store the mixture under nitrogen.

[0092] Step 4: Preparation of rapid repair adhesive for mining polyurethane cold vulcanized conveyor belts

[0093] The adhesive includes a base coat and a top coat composed of components A and B. Components A and B are mixed evenly in a volume ratio of 1:1 to obtain the top coat. The top coat and the base coat together constitute the quick repair adhesive for mining polyurethane cold vulcanized conveyor belts.

[0094] The method for rapid repair of mining conveyor belts using the aforementioned adhesive

[0095] Step 1: First, clean the damaged belt area by sanding it clean, removing contaminants and debris. Then, use a brush to apply the primer to the damaged area, applying 5 to 6 coats and letting it dry for 6 to 9 minutes. The area to be coated should be larger than the damaged area.

[0096] The second step is to quickly mix components A and B of the topcoat adhesive in a 1:1 volume ratio until homogeneous, and then use...

[0097] Apply the top coat of adhesive to the base coat of adhesive using a brush and quickly brush it 5-6 times.

[0098] Step 3: Pour the remaining adhesive onto the surface that has already been coated with adhesive and level it. At this time, pour A.

[0099] When the mixed liquid is applied to side B, it will react and generate heat, reaching a temperature of 45℃~55℃. The adhesive will cure and the repair will be completed in about 30~40 minutes.

[0100] Example 2

[0101] This invention discloses a polyurethane cold vulcanized conveyor belt repair adhesive for mining, comprising a base coat adhesive and a top coat adhesive composed of component A and component B. The base coat adhesive, component A, and component B are all measured in parts by weight. The technical solution also includes the preparation of each adhesive and the repair process of the conveyor belt.

[0102] Composition of the primer adhesive:

[0103] 111 parts castor oil, 100 parts 4,4'-diphenylmethane diisocyanate, 15 parts hydroxyethyl methacrylate, 50 parts solvent oil, 1.0 part latent curing agent, and 0.7 parts defoamer.

[0104] Composition of component A of the topcoat liquid

[0105] 12 parts of 3,3'-dichloro-4,4'-diaminodiphenylmethane (MOCA), 2 parts of trimethylolpropane, 5 parts of diethyltoluenediamine (E-100), 31 parts of N210 type polyether polyol, 18 parts of N220 type polyether polyol, 5 parts of N305 type polyether polyol, 33 parts of flame retardant, 0.9 parts of black paste, 3 parts of antistatic agent, 1.0 part of defoamer, 0.2 parts of T15 type catalyst, 1.0 part of carbon fiber short filament, 0.5 parts of N,N-dimethylaniline, and 0.3 parts of tetramethylethylenediamine.

[0106] Composition of component B of the topcoat liquid

[0107] 48 parts of polytetrahydrofuran ether diol, 55 parts of liquefied MDI-100L, 5 parts of flame retardant, 1.0 part of benzoyl peroxide, and 0.9 parts of black paste.

[0108] The castor oil mentioned is Grade A castor oil, a commercially available industrial product.

[0109] The 4,4'-diphenylmethane diisocyanate is an industrial product with a -NCO content of 33.6% by mass, produced by Shandong Yantai Wanhua Chemical Group.

[0110] The hydroxyethyl methacrylate is a commercially available industrial product.

[0111] The solvent oil is a mixture of tris(2-chloroethyl) phosphate, aromatic oil, and naphthenic oil in a mass ratio of 1:2:1;

[0112] The aromatic oil was produced by Pengchen New Material Technology Co., Ltd.

[0113] The naphthenic oil is KN4016 type naphthenic oil, a commercially available industrial product.

[0114] The latent curing agent is YRLH-1106 type latent curing agent, produced by Guangzhou Yourun Synthetic Materials Co., Ltd.

[0115] The 3,3'-dichloro-4,4'-diaminodiphenylmethane is a commercially available ordinary type II.

[0116] The trimethylolpropane is a commercially available industrial grade.

[0117] The diethyltoluenediamine is a commercially available industrial grade.

[0118] The N210 type polyether polyol, N220 type polyether polyol, and N305 type polyether polyol are all commercially available industrial products.

[0119] The flame retardant is one of dimethyl methylphosphonate or tris(2-chloroethyl) phosphate flame retardants, a commercially available industrial product;

[0120] The black paste is an oil-based conductive carbon black paste, produced by Suzhou Aolaixin Building Materials Co., Ltd.

[0121] The antistatic agent is CUCE-W type antistatic agent, produced by Guangzhou Yourun Synthetic Materials Co., Ltd., or JLWT-1 type antistatic agent, produced by Shandong Juli Antistatic Technology Co., Ltd., or E-6019AR antistatic agent, produced by Dongguan Fiat Antistatic Technology Co., Ltd.

[0122] The defoamer is YPXP-07A type defoamer, produced by Guangzhou Yourun Synthetic Materials Co., Ltd., or BYK-1790 and BYK-1799 type defoamers are distributed by BYK-1790 and BYK-1799 AG of Germany.

[0123] The T15 catalyst is a delayed catalyst, produced by Shandong Lanyue New Material Technology Co., Ltd.

[0124] The carbon fiber short filaments are self-made with a length of 0.3mm to 0.5mm, and the precursor fiber is T800 produced by Shanxi Coal Chemistry Research Institute;

[0125] The N,N-dimethylaniline and tetramethylethylenediamine mentioned are commercially available industrial products;

[0126] The polytetrahydrofuran ether diol is a commercially available industrial product with a relative molecular mass of 1000.

[0127] The liquefied MDI-100L has an -NCO content of 28% to 30% and is produced by Yantai Wanhua Chemical Group.

[0128] The benzoyl peroxide is chemically pure and a commercially available product.

[0129] The specific preparation method of the mining polyurethane cold vulcanized conveyor belt repair adhesive includes the following steps:

[0130] Step 1: Preparation of primer adhesive

[0131] 111 parts of castor oil were added to a reactor equipped with a vacuum system and dehydrated at 120°C under a vacuum of 0.09 MPa for 2 hours. After dehydration, 100 parts of 4,4'-diphenylmethane diisocyanate were added to the reactor and reacted at 80°C ± 2°C for 2 hours. Then, 15 parts of hydroxyethyl methacrylate were added dropwise to the reactor and reacted for another hour. After the reaction was completed, the mixture was defoamed at 0.09 MPa until it was clear. Then, it was cooled to room temperature, and 50 parts of solvent oil, 1.0 part of latent curing agent, and 0.7 parts of defoamer were added to the reactor and mixed evenly to obtain the primer. The mixture was then filled and stored under high-purity nitrogen.

[0132] Step 2: Preparation of Component A of the Topcoat Adhesive

[0133] First, 12 parts of 3,3'-dichloro-4,4'-diaminodiphenylmethane, 2 parts of trimethylolpropane, and 5 parts of diethyltoluenediamine are added and heated to 100°C–120°C to melt. Then, 31 parts of N210 type polyether polyol, 18 parts of N220 type polyether polyol, 5 parts of N305 type polyether polyol, and 33 parts of flame retardant are added to a mixer equipped with a vacuum system and heated to 100°C. Then, the molten 3,3'-dichloro-4,4'-diaminodiphenylmethane, trimethylolpropane, and diethyltoluenediamine are mixed... Add 0.9 parts of the compound and black slurry to the mixer, turn on the vacuum pump and dehydrate at 0.09 MPa and 110℃~120℃ for 2 hours. After dehydration, cool the material in the mixer to below 25℃. Finally, add 3 parts of antistatic agent, 1.0 part of defoamer, 0.2 parts of T15 catalyst, 1.0 part of carbon fiber short filament, 0.5 parts of N,N-dimethylaniline, and 0.3 parts of tetramethylethylenediamine to the mixer, continue stirring and degassing for 5~10 minutes, and then dispense into galvanized metal cans, fill with high-purity nitrogen and seal for storage to obtain component A.

[0134] Step 3: Preparation of Component B of the Topcoat Liquid

[0135] Add 48 parts of polytetrahydrofuran ether glycol to a reactor equipped with a vacuum system. Heat to 110–120°C and dehydrate for 2 hours at a pressure above 0.09 MPa using a vacuum pump. After dehydration, cool the material to below 50°C. Then add 55 parts of liquefied MDI-100L and react at 60 ± 2°C for 40 minutes. Then heat to 80 ± 2°C and react for 2 hours. Cool to below 25°C and add 0.9 parts of black paste. Degas at a pressure above 0.09 MPa using a vacuum pump. Degassing is complete when the material becomes clear and free of bubbles. Add 5 parts of flame retardant and 1.0 part of benzoyl peroxide to the system and mix thoroughly to obtain component B. Then, seal and store the mixture under nitrogen.

[0136] Step 4: Preparation of rapid repair adhesive for mining polyurethane cold vulcanized conveyor belts

[0137] The adhesive includes a base coat and a top coat composed of components A and B. Components A and B are mixed evenly in a volume ratio of 1:1 to obtain the top coat. The top coat and the base coat together constitute the quick repair adhesive for mining polyurethane cold vulcanized conveyor belts.

[0138] The method for rapid repair of mining conveyor belts using the aforementioned adhesive

[0139] Step 1: First, clean the damaged belt area by sanding it clean, removing contaminants and debris. Then, use a brush to apply the base coat adhesive.

[0140] Apply the liquid to the damaged area, apply 5 to 6 times, and let it dry for 6 to 9 minutes. The area covered by the liquid should be larger than the damaged area.

[0141] The second step is to quickly mix components A and B of the topcoat adhesive in a 1:1 volume ratio until homogeneous, and then use...

[0142] Apply the top coat of adhesive to the base coat of adhesive using a brush and quickly brush it 5-6 times.

[0143] Step 3: Pour the remaining adhesive onto the surface that has already been coated with adhesive and level it. At this time, pour A.

[0144] When the mixed liquid is applied to side B, it will react and generate heat, reaching a temperature of 45℃~55℃. The adhesive will cure and the repair will be completed in about 30~40 minutes.

[0145] Example 3

[0146] This invention discloses a polyurethane cold vulcanized conveyor belt repair adhesive for mining, comprising a base coat adhesive and a top coat adhesive composed of component A and component B. The base coat adhesive, component A, and component B are all measured in parts by weight. The technical solution also includes the preparation of each adhesive and the repair process of the conveyor belt.

[0147] Composition of the primer adhesive:

[0148] 109 parts castor oil, 98 parts 4,4'-diphenylmethane diisocyanate, 14 parts hydroxyethyl methacrylate, 49 parts solvent oil, 0.8 parts latent curing agent, and 0.6 parts defoamer.

[0149] Composition of component A of the topcoat liquid

[0150] 11 parts of 3,3'-dichloro-4,4'-diaminodiphenylmethane, 2 parts of trimethylolpropane, 5 parts of diethyltoluenediamine, 30 parts of N210 type polyether polyol, 17 parts of N220 type polyether polyol, 4 parts of N305 type polyether polyol, 32 parts of flame retardant, 0.8 parts of black paste, 3 parts of antistatic agent, 0.9 parts of defoamer, 0.1 parts of T15 type catalyst, 0.9 parts of carbon fiber short filament, 0.4 parts of N,N-dimethylaniline, and 0.3 parts of tetramethylethylenediamine.

[0151] Composition of component B of the topcoat liquid

[0152] 47 parts of polytetrahydrofuran ether diol, 54 parts of liquefied MDI-100L, 5 parts of flame retardant, 0.9 parts of benzoyl peroxide, and 0.8 parts of black paste.

[0153] The castor oil mentioned is Grade A castor oil, a commercially available industrial product.

[0154] The 4,4'-diphenylmethane diisocyanate is an industrial product with a -NCO content of 33.6% by mass, produced by Shandong Yantai Wanhua Chemical Group.

[0155] The hydroxyethyl methacrylate is a commercially available industrial product.

[0156] The solvent oil is a mixture of tris(2-chloroethyl) phosphate, aromatic oil, and naphthenic oil in a mass ratio of 1:2:1;

[0157] The aromatic oil was produced by Pengchen New Material Technology Co., Ltd.

[0158] The naphthenic oil is KN4016 type naphthenic oil, a commercially available industrial product.

[0159] The latent curing agent is YRLH-1106 type latent curing agent, produced by Guangzhou Yourun Synthetic Materials Co., Ltd.

[0160] The 3,3'-dichloro-4,4'-diaminodiphenylmethane is a commercially available ordinary type II.

[0161] The trimethylolpropane is a commercially available industrial grade.

[0162] The diethyltoluenediamine is a commercially available industrial grade.

[0163] The N210 type polyether polyol, N220 type polyether polyol, and N305 type polyether polyol are all commercially available industrial products.

[0164] The flame retardant is one of dimethyl methylphosphonate or tris(2-chloroethyl) phosphate flame retardants, a commercially available industrial product;

[0165] The black paste is an oil-based conductive carbon black paste, produced by Suzhou Aolaixin Building Materials Co., Ltd.

[0166] The antistatic agent is CUCE-W type antistatic agent, produced by Guangzhou Yourun Synthetic Materials Co., Ltd., or JLWT-1 type antistatic agent, produced by Shandong Juli Antistatic Technology Co., Ltd., or E-6019AR antistatic agent, produced by Dongguan Fiat Antistatic Technology Co., Ltd.

[0167] The defoamer is YPXP-07A type defoamer, produced by Guangzhou Yourun Synthetic Materials Co., Ltd., or BYK-1790 and BYK-1799 type defoamers are distributed by BYK-1790 and BYK-1799 AG of Germany.

[0168] The T15 catalyst is a delayed catalyst, produced by Shandong Lanyue New Material Technology Co., Ltd.

[0169] The carbon fiber short filaments are self-made with a length of 0.3mm to 0.5mm, and the precursor fiber is T800 produced by Shanxi Coal Chemistry Research Institute;

[0170] The N,N-dimethylaniline and tetramethylethylenediamine mentioned are commercially available industrial products;

[0171] The polytetrahydrofuran ether diol is a commercially available industrial product with a relative molecular mass of 1000.

[0172] The liquefied MDI-100L has an -NCO content of 28% to 30% and is produced by Yantai Wanhua Chemical Group.

[0173] The benzoyl peroxide is chemically pure and a commercially available product.

[0174] The specific preparation method of the mining polyurethane cold vulcanized conveyor belt repair adhesive includes the following steps:

[0175] Step 1: Preparation of primer adhesive

[0176] 109 parts of castor oil were added to a reactor equipped with a vacuum system and dehydrated at 120°C under a vacuum of 0.09 MPa for 2 hours. After dehydration, 98 parts of 4,4'-diphenylmethane diisocyanate were added to the reactor and reacted at 80°C ± 2°C for 2 hours. Then, 14 parts of hydroxyethyl methacrylate were added dropwise to the reactor and reacted for another hour. After the reaction was completed, the mixture was defoamed at 0.09 MPa until it was clear. Then, it was cooled to room temperature, and 49 parts of solvent oil, 0.8 parts of latent curing agent, and 0.6 parts of defoamer were added to the reactor and mixed evenly to obtain a primer. The primer was then filled and sealed with high-purity nitrogen for storage.

[0177] Step 2: Preparation of Component A of the Topcoat Adhesive

[0178] First, 11 parts of 3,3'-dichloro-4,4'-diaminodiphenylmethane and 2 parts of trimethylolpropane are added to 5 parts of diethyltoluenediamine and heated to 100℃~120℃ to melt. Then, 30 parts of N210 type polyether polyol, 17 parts of N220 type polyether polyol, 4 parts of N305 type polyether polyol, and 32 parts of flame retardant are added to a mixer equipped with a vacuum system and heated to 100℃. Then, the molten 3,3'-dichloro-4,4'-diaminodiphenylmethane, trimethylolpropane, and diethyltoluenediamine are mixed... Add 0.8 parts of black slurry to a mixer, turn on the vacuum pump and dehydrate at 0.09 MPa and 110℃~120℃ for 2 hours. After dehydration, cool the material in the mixer to below 25℃. Finally, add 3 parts of antistatic agent, 0.9 parts of defoamer, 0.1 parts of T15 catalyst, 0.9 parts of carbon fiber short filament, 0.4 parts of N,N-dimethylaniline, and 0.3 parts of tetramethylethylenediamine to the mixer, continue stirring and degassing for 5~10 minutes, and then dispense into galvanized metal cans, seal and store with high-purity nitrogen to obtain component A.

[0179] Step 3: Preparation of Component B of the Topcoat Liquid

[0180] Add 47 parts of polytetrahydrofuran ether glycol to a reactor equipped with a vacuum system. Heat to 110–120°C and dehydrate for 2 hours at a pressure above 0.09 MPa using a vacuum pump. After dehydration, cool the material to below 50°C. Then add 54 parts of liquefied MDI-100L and react at 60 ± 2°C for 40 minutes. Then heat to 80 ± 2°C and react for 2 hours. Cool to below 25°C and add 0.8 parts of black paste. Degas at a pressure above 0.09 MPa using a vacuum pump. Degassing is complete when the material becomes clear and free of bubbles. Add 5 parts of flame retardant and 0.9 parts of benzoyl peroxide to the system and mix thoroughly to obtain component B. Then, seal and store the mixture under nitrogen.

[0181] Step 4: Preparation of rapid repair adhesive for mining polyurethane cold vulcanized conveyor belts

[0182] The adhesive includes a base coat and a top coat composed of components A and B. Components A and B are mixed evenly in a volume ratio of 1:1 to obtain the top coat. The top coat and the base coat together constitute the quick repair adhesive for mining polyurethane cold vulcanized conveyor belts.

[0183] Quick Repair Methods for Mining Conveyor Belts

[0184] Step 1: First, clean the damaged belt area by sanding it clean, removing contaminants and debris. Then, use a brush to apply the primer to the damaged area, applying 5 to 6 coats and letting it dry for 6 to 9 minutes. The area to be coated should be larger than the damaged area.

[0185] The second step is to quickly mix the topcoat adhesive components A and B in a 1:1 volume ratio, and then use a brush to apply the topcoat adhesive to the base coat 5-6 times.

[0186] Step 3: Pour the remaining adhesive onto the surface that has already been coated with adhesive and level it. At this time, pour A.

[0187] When the mixed liquid is applied to side B, it will react and generate heat, reaching a temperature of 45℃~55℃. The adhesive will cure and the repair will be completed in about 30~40 minutes.

[0188] Referring to relevant national standards such as GB / 4472-2001 Method for Determination of Relative Density of Chemical Products, GB / T Shear Impact Strength Test Method for Adhesives, GB / T528-2009 Test of Tensile Stress-Strain Properties of Vulcanized Rubber or Thermoplastic Rubber, GB / T529-2008 Test of Tear Strength of Vulcanized Rubber or Thermoplastic Rubber, GB / T39693.7-2022 Test of Hardness of Vulcanized Rubber or Thermoplastic Rubber, GB / T2792-2014 Test Method for Peel Strength of Adhesives, and MT113-1995 General Test Method and Judgment Rules for Flame Retardancy and Antistatic Properties of Polymer Products Used in Coal Mines, the properties of the rapid repair adhesive and cured product of the polyurethane cold vulcanized conveyor belt for mining of this invention were determined and are shown in Table 1. The test data of Examples 1 to 3 all conform to the properties shown in Table 1.

[0189] Table 1. Performance of a quick-repair adhesive and product for a mining polyurethane cold-vulcanized conveyor belt

[0190]

Claims

1. A quick-repair adhesive for cold-vulcanized polyurethane conveyor belts used in mining, characterized in that: It includes a base coat adhesive and a top coat adhesive composed of component A and component B; both the base coat adhesive and the top coat adhesive are measured in parts by weight. The primer adhesive comprises the following components: Castor oil 107-111 parts, 4,4'-diphenylmethane diisocyanate 95-100 parts, hydroxyethyl methacrylate 13-15 parts, solvent oil 47-50 parts, latent curing agent 0.6-1.0 parts, defoamer 0.4-0.7 parts; Component A of the surface coating liquid includes the following components: 11-12 parts of 3,3'-dichloro-4,4'-diaminodiphenylmethane, 1-2 parts of trimethylolpropane, 4-5 parts of diethyltoluenediamine, 29-31 parts of N210 type polyether polyol, 16-18 parts of N220 type polyether polyol, 3-5 parts of N305 type polyether polyol, 31-33 parts of flame retardant, 0.6-0.9 parts of black paste, 2-3 parts of antistatic agent, 0.8-1.0 parts of defoamer, 0.1-0.2 parts of T15 type catalyst, 0.9-1.0 parts of carbon fiber short filament, 0.3-0.5 parts of N,N-dimethylaniline, and 0.2-0.3 parts of tetramethylethylenediamine; Component B of the surface coating liquid includes the following components: 46-48 parts of polytetrahydrofuran ether diol, 53-55 parts of liquefied MDI-100L, 4-5 parts of flame retardant, 0.8-1.0 parts of benzoyl peroxide, and 0.6-0.9 parts of black paste.

2. The rapid repair adhesive for mining polyurethane cold vulcanized conveyor belts according to claim 1, characterized in that: The castor oil mentioned is Grade A castor oil, a commercially available industrial product. The 4,4'-diphenylmethane diisocyanate is an industrial product with a -NCO content of 33.6% by mass, produced by Shandong Yantai Wanhua Chemical Group. The hydroxyethyl methacrylate is a commercially available industrial product. The solvent oil is a mixture of tris(2-chloroethyl) phosphate, aromatic oil, and naphthenic oil in a mass ratio of 1:2:1; the aromatic oil is produced by Pengchen New Material Technology Co., Ltd. The naphthenic oil is KN4016 type naphthenic oil, a commercially available industrial product. The latent curing agent is YRLH-1106 type latent curing agent, produced by Guangzhou Yourun Synthetic Materials Co., Ltd.

3. The rapid repair adhesive for mining polyurethane cold vulcanized conveyor belts according to claim 1, characterized in that: The 3,3'-dichloro-4,4'-diaminodiphenylmethane is a commercially available ordinary grade II. The trimethylolpropane is a commercially available industrial grade. The diethyltoluenediamine is a commercially available industrial grade. The N210 type polyether polyol, N220 type polyether polyol, and N305 type polyether polyol are all commercially available industrial products. The flame retardant is one of dimethyl methylphosphonate or tris(2-chloroethyl) phosphate, a commercially available industrial product; The black paste is an oil-based conductive carbon black paste, produced by Suzhou Aolaixin Building Materials Co., Ltd.

4. The rapid repair adhesive for mining polyurethane cold vulcanized conveyor belts according to claim 1, characterized in that: The antistatic agent is selected from CUCE-W type antistatic agent, JLWT-1 type antistatic agent or E-6019AR antistatic agent, and is produced by Guangzhou Yourun Synthetic Materials Co., Ltd., Shandong Juli Antistatic Technology Co., Ltd. or Dongguan Fiat Antistatic Technology Co., Ltd., respectively. The defoamer is selected from YPXP-07A type defoamer, BYK-1790 type defoamer or BYK-1799 type defoamer, and is distributed by Guangzhou Yourun Synthetic Materials Co., Ltd. or BYK S.A. of Germany, respectively. The T15 catalyst is a delayed catalyst, produced by Shandong Lanyue New Material Technology Co., Ltd.

5. The rapid repair adhesive for mining polyurethane cold vulcanized conveyor belts according to claim 1, characterized in that: The carbon fiber short filaments have a length of 0.3mm to 0.5mm, and the precursor fiber is T800 type produced by Shanxi Coal Chemistry Research Institute; The N,N-dimethylaniline and tetramethylethylenediamine mentioned are commercially available industrial products; The polytetrahydrofuran ether diol is a commercially available industrial product with a relative molecular mass of 1000. The liquefied MDI-100L has an -NCO content of 28% to 30% and is produced by Yantai Wanhua Chemical Group. The benzoyl peroxide is chemically pure and a commercially available product.

6. A method for preparing a rapid repair adhesive for mining polyurethane cold vulcanized conveyor belts as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Step 1: Preparation of primer adhesive 107-111 parts of castor oil were added to a reactor equipped with a vacuum system and dehydrated for 2 hours at 120°C and 0.09 MPa vacuum. After dehydration, 95-100 parts of 4,4'-diphenylmethane diisocyanate were added and reacted at 80°C ± 2°C for 2 hours. Then, 13-15 parts of hydroxyethyl methacrylate were added dropwise to the reactor and the reaction continued for 1 hour. After the reaction was completed, the mixture was degassed until clear at 0.09 MPa and cooled to room temperature. Subsequently, 47-50 parts of solvent oil, 0.6-1.0 parts of latent curing agent, and 0.4-0.7 parts of defoamer were added and mixed evenly to obtain the primer liquid. The mixture was then filled and stored under high-purity nitrogen. Step 2: Preparation of Component A of the Topcoat Adhesive First, 11-12 parts of 3,3'-dichloro-4,4'-diaminodiphenylmethane and 1-2 parts of trimethylolpropane are added to 4-5 parts of diethyltoluenediamine and heated to 100-120°C to melt. Then, 29-31 parts of N210 type polyether polyol, 16-18 parts of N220 type polyether polyol, 3-5 parts of N305 type polyether polyol, and 31-33 parts of flame retardant are added to a mixer equipped with a vacuum system and heated to 100°C. Finally, the molten mixture and 0.6-0.9 parts of black paste are added to the mixer. In the separator, the vacuum pump is turned on to dehydrate the material at 0.09 MPa and 110℃~120℃ for 2 hours; after dehydration, the material is cooled to below 25℃; finally, 2 to 3 parts of antistatic agent, 0.8 to 1.0 parts of defoamer, 0.1 to 0.2 parts of T15 catalyst, 0.9 to 1.0 parts of carbon fiber short filaments, 0.3 to 0.5 parts of N,N-dimethylaniline and 0.2 to 0.3 parts of tetramethylethylenediamine are added, and stirring and degassing are continued for 5 to 10 minutes. The mixture is then dispensed into galvanized metal cans, sealed and stored under high-purity nitrogen to obtain component A. Step 3: Preparation of Component B of the Topcoat Adhesive Add 46-48 parts of polytetrahydrofuran ether diol to a reactor equipped with a vacuum system, heat to 110-120°C, and dehydrate for 2 hours at a pressure above 0.09 MPa using a vacuum pump. After dehydration, cool the material to below 50°C. Add 53-55 parts of liquefied MDI-100L, control the reaction temperature at 60±2°C and react for 40 minutes, then raise the temperature to 80±2°C and react for 2 hours. Subsequently, cool to below 25°C, add 0.6-0.9 parts of black slurry, and degas at a pressure above 0.09 MPa until no bubbles remain. Add 4-5 parts of flame retardant and 0.8-1.0 parts of benzoyl peroxide to the system, mix thoroughly to obtain component B, and store in a sealed container under nitrogen. Step 4: Preparation of rapid repair adhesive for mining polyurethane cold vulcanized conveyor belts The A component obtained in the second step and the B component obtained in the third step are mixed evenly at a volume ratio of 1:1 to obtain the top coating adhesive; the top coating adhesive and the bottom coating adhesive obtained in the first step together constitute the mining polyurethane cold vulcanized conveyor belt repair adhesive.

7. A method for using the rapid repair adhesive for mining polyurethane cold vulcanized conveyor belts as described in any one of claims 1-5, characterized in that, Includes the following steps: Clean the damaged area of ​​the conveyor belt by grinding, removing contaminants and debris. Apply the primer to the damaged area with a brush, applying 5-6 coats and letting it dry for 6-9 minutes. The coated area should be larger than the damaged area. Step 2: Quickly mix components A and B of the topcoat liquid at a volume ratio of 1:1 until evenly mixed. Use a brush to apply the mixed topcoat liquid to the area where the base coat has been applied 5 to 6 times. The third step is to pour the remaining adhesive liquid onto the surface that has already been coated with adhesive and level it. The mixed liquid reacts and generates heat after pouring, reaching a temperature of 45℃~55℃. The adhesive liquid will solidify after 30~40 minutes, and the repair is complete.

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