Bi-component polyurethane rubber repair adhesive as well as preparation method and application thereof

Abstract

The invention provides a two-component polyurethane rubber repair adhesive as well as a preparation method and application thereof, and belongs to the technical field of adhesives. The bi-component polyurethane rubber repair adhesive has stronger adhesive force, can firmly combine a repaired part with a repaired rubber material, is not easy to crack, fall off and the like, and enhances the repair effect. And the curing time is short, the accidental shutdown time of equipment can be effectively shortened, the requirement for rapid recovery of operation of the equipment in industrial production is met, and the production efficiency is improved. After curing, the strength is high, the tear resistance is good, tension and stress changes in the using process can be borne, damage is prevented from being further expanded, and the service life of a repaired material is prolonged. The method is particularly suitable for quickly and temporarily repairing light damage of a conveying belt in a belt type material conveying system, is high in pertinence, and overcomes the defects of an existing repairing method in the field.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, and particularly relates to a two-component polyurethane rubber repair adhesive and its preparation method and application. Background Art

[0002] In modern industrial production, belt material conveying systems are widely used in many fields such as mines, ports, power plants, and chemical industries, and are key equipment for continuous material conveying. As the core component of the belt material conveying system, the conveyor belt will inevitably be damaged by various factors during long-term operation. For example, in mine transportation, the sharp edges and corners of ores, large lumps, and frequent friction and impacts are likely to cause mild damages such as wear, scratches, and local tears on the surface of the conveyor belt; in port loading and unloading operations, improper loading and unloading operations of goods may also cause a certain degree of damage to the conveyor belt.

[0003] Currently, for the repair of mild damages to conveyor belts in belt material conveying systems, there are mainly the following technologies and products: Some traditional repair methods use ordinary rubber adhesives for repair. However, these ordinary adhesives have many deficiencies. On the one hand, their adhesive force is relatively weak, and it is difficult to firmly bond the repaired part to the conveyor belt body in a short time. During the continuous operation of the conveyor belt, the repaired part is prone to problems such as cracking and falling off again, resulting in poor repair effects and the need for frequent secondary repairs, increasing the maintenance cost and downtime.

[0004] On the other hand, the curing time of some existing rubber repair adhesives is relatively long. In industrial production, the downtime of conveyor belts is often strictly limited. The long curing time makes the equipment unable to resume operation in time, greatly affecting production efficiency, increasing the accidental downtime, and bringing greater economic losses to enterprises. In addition, some adhesives have insufficient strength after curing and poor tear resistance, and cannot withstand the tension and stress changes during the operation of the conveyor belt, easily causing the damage to further expand.

[0005] With the continuous development of industrial production, higher requirements are put forward for the reliability and operation efficiency of belt material conveying systems. Therefore, there is an urgent need for a product that can quickly and effectively repair mild damages to conveyor belts. This product should have the characteristics of strong adhesive force, short curing time, high curing strength, and good tear resistance, so as to reduce accidental downtime, improve production efficiency, and enhance the repair effect.

[0006] The present invention aims to provide a two-component polyurethane rubber repair adhesive and its preparation method and application. This repair adhesive has the advantages of stronger adhesive force, short curing time, and high curing strength, and can meet the requirements for rapid temporary repair of mild damages to conveyor belts in belt material conveying systems, effectively solving the problems existing in the prior art. Summary of the Invention

[0007] The object of the present invention is to provide a two-component polyurethane rubber repair adhesive, its preparation method and application, which have the advantages of stronger adhesion, short curing time and high curing strength.

[0008] In order to achieve the above object of the invention, the present invention provides the following technical solutions:

[0009] The present invention provides a two-component polyurethane rubber repair adhesive, which contains component A and component B:

[0010] The raw materials of component A include MDI, polyether polyol and dioctyl phthalate;

[0011] The raw materials of component B include castor oil, organotin and MOCA.

[0012] Preferably, the mass ratio of component A to component B is 1:1.

[0013] Preferably, in component A, the weight ratio of MDI-100, polypropylene glycol ether and dioctyl phthalate is 78:9:14.

[0014] Preferably, in component B, the weight ratio of castor oil, organotin and MOCA is 50:0.5-2:40-60.

[0015] Preferably, the raw materials of the two-component polyurethane rubber repair adhesive further include a toughening agent, a filler, an antioxidant, a light stabilizer, a leveling agent or a color modifier.

[0016] Preferably, the toughening agent includes carboxyl-terminated nitrile rubber, liquid polybutadiene rubber or styrene-butadiene-styrene block copolymer;

[0017] The filler includes white carbon black, calcium carbonate or talc powder;

[0018] The antioxidant includes 2,6-di-tert-butyl-p-cresol, antioxidant or triphenyl phosphite;

[0019] The light stabilizer includes bis(1,2,2,6,6-pentamethylpiperidyl) sebacate, 2-hydroxy-4-methoxybenzophenone or nickel complex;

[0020] The leveling agent includes polydimethylsiloxane, acrylate leveling agent or organosilicon-modified acrylate leveling agent.

[0021] The present invention also provides a preparation method of the above two-component polyurethane rubber repair adhesive, which includes the following steps:

[0022] The polyether polyol is subjected to vacuum dehydration treatment at 100 - 120 °C, cooled to 50 - 70 °C, MDI is added, and the temperature is raised to 60 - 80 °C for reaction for 2 - 4 h. Then it is cooled to 20 - 40 °C and dioctyl phthalate is added to obtain Component A;

[0023] All the raw materials of Component B are mixed and subjected to vacuum dehydration treatment at 100 - 120 °C to obtain Component B.

[0024] Preferably, the time of the vacuum dehydration treatment is 1 - 3 h.

[0025] Preferably, Component B also includes cooling to 20 - 40 °C after the vacuum dehydration treatment.

[0026] The present invention also provides the application of the above-mentioned two-component polyurethane rubber repair adhesive or the two-component polyurethane rubber repair adhesive prepared by the above preparation method in the repair of conveyor belts.

[0027] The technical effects and advantages of the present invention:

[0028] In the present invention, the two-component polyurethane rubber repair adhesive has stronger adhesion, can firmly bond the repaired part with the rubber material to be repaired (such as the conveyor belt in the belt material conveying system), and is not prone to problems such as cracking and peeling, enhancing the repair effect. The curing time is short, which can effectively reduce the accidental shutdown time of the equipment, meet the demand for the rapid resumption of equipment operation in industrial production, and improve production efficiency. After curing, it has high strength and good tear resistance, can withstand the tension and stress changes during use (such as when the conveyor belt is running), prevent further expansion of damage, and extend the service life of the repaired material. Under different environmental conditions (such as temperature and humidity changes), it can still maintain good performance stability, adapt to a variety of working scenarios, and reduce the repair failure cases caused by environmental factors. It is particularly suitable for the rapid temporary repair of minor damage to the conveyor belt in the belt material conveying system, with strong pertinence, and solves the deficiencies of the existing repair methods in this field. Specific Embodiments

[0029] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they cannot be understood as limiting the protection scope of the present invention.

[0030] Example 1

[0031] This example provides a two-component polyurethane rubber repair adhesive, containing Component A and Component B:

[0032] The raw materials of Component A include 78 parts of MDI-100, 9 parts of polypropylene glycol ether, and 14 parts of dioctyl phthalate;

[0033] The raw materials of Component B include 50 parts of castor oil, 1 part of organotin, and 49 parts of MOCA;

[0034] In this embodiment, the raw materials further include toner.

[0035] The mass ratio of component A to component B is 1:1.

[0036] Preparation method:

[0037] First step: Dehydrate polypropylene glycol ether under reduced pressure at 110°C and 0.1 Mpa negative pressure for 2 hours. Cool down to 60°C and add the formulated amount of MDI -100 , heat up to 70°C and react for 3 hours. After cooling to room temperature, add the formulated amount of dioctyl phthalate to obtain component A;

[0038] Second step: Stir castor oil, dibutyltin dilaurate, MOCA and toner evenly at 45°C, then heat to 110°C and dehydrate under reduced pressure for 2 hours. After dehydration is completed, cool down to room temperature to obtain component B.

[0039] Usage method: Pack components A and B separately in a mixing rubber tube. Use a special glue gun to mix components A and B evenly and squeeze them into the damaged part of the conveyor belt, and scrape and level with a scraper. After the glue cures, the conveyor can be started and run.

[0040] Performance result: After this product is scraped and coated on the surface of the steel wire conveyor belt in the coal mine, there is no peeling, obvious wear or aging after running for 12 months, and the running effect is good.

[0041] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A two-component polyurethane rubber repair adhesive, characterized in that: Contains component A and component B: The raw materials of component A include MDI, polyether polyol and dioctyl phthalate; The B component raw materials include castor oil, organotin and MOCA.

2. The two-component polyurethane rubber repair adhesive according to claim 1, characterized in that: The mass ratio of component A to component B is 1:

1.

3. The two-component polyurethane rubber repair adhesive according to claim 1, characterized in that: In the component A, the weight ratio of MDI-100, polypropylene glycol ether and dioctyl phthalate is 78:9:

14.

4. The two-component polyurethane rubber repair adhesive according to claim 1, characterized in that: In the B component, the weight ratio of castor oil, organotin and MOCA is 50:0.5-2:40-60.

5. The two-component polyurethane rubber repair adhesive according to claim 1, characterized in that: The raw materials of the two-component polyurethane rubber repair adhesive also include a toughening agent, a filler, an antioxidant, a light stabilizer, a leveling agent or a color-changing agent.

6. The two-component polyurethane rubber repair adhesive according to claim 5, characterized in that: The toughening agent includes carboxyl-terminated nitrile rubber, liquid polybutadiene rubber or styrene-butadiene-styrene block copolymer; The filler includes white carbon black, calcium carbonate or talc; The antioxidant includes 2,6-di-tert-butyl-p-cresol, an antioxidant or triphenyl phosphite; The light stabilizer includes bis(1,2,2,6,6-pentamethylpiperidinyl) sebacate, 2-hydroxy-4-methoxybenzophenone or a nickel complex; The leveling agent includes polydimethylsiloxane, acrylate leveling agent or silicone-modified acrylate leveling agent.

7. The method for preparing the two-component polyurethane rubber repair adhesive according to any one of claims 1 to 6, characterized in that: The following steps are involved: The polyether polyol is subjected to a reduced pressure dehydration treatment at 100-120° C., the temperature is lowered to 50-70° C., MDI is added, the temperature is raised to 60-80° C., the reaction is performed for 2-4 hours, the temperature is lowered to 20-40° C., dioctyl phthalate is added, and component A is obtained; All raw materials of component B are mixed, and subjected to reduced pressure dehydration treatment at 100-120° C. to obtain component B.

8. The method for preparing the two-component polyurethane rubber repair adhesive according to claim 7, characterized in that: The time of the reduced pressure dehydration treatment is 1 to 3 hours.

9. The method for preparing a two-component polyurethane rubber repair adhesive according to claim 7, characterized in that: Component B also includes a reduced pressure dehydration treatment followed by cooling to 20-40°C.

10. Use of the two-component polyurethane rubber repair adhesive according to any one of claims 1 to 6 or the two-component polyurethane rubber repair adhesive prepared by the preparation method according to any one of claims 7 to 9 in repairing conveyor belts.