High-load type transmission rubber belt primer and preparation method thereof

Abstract

The invention relates to the field of transmission belt primer, in particular to high-load transmission belt primer and a preparation method thereof. The chloroprene rubber composite material is prepared from the following components in parts by weight: 100 parts of chloroprene rubber, 10 to 15 parts of polyvinyl alcohol fiber, 5 to 8 parts of reinforced fiber, 30 to 50 parts of composite filler, 2.5 to 4.0 parts of silane coupling agent, 4 to 9 parts of metal oxide, 7 to 10 parts of functional additive and 5 to 8 parts of tear-resistant resin. Through collaborative design of a fiber-filler-aid system and a controllable process, balanced improvement of the strength, wear resistance and fatigue resistance of the primer of the adhesive tape is realized, and a reliable material solution is provided for a high-load transmission system.

Description

Technical Field

[0001] This invention relates to the field of transmission belt base adhesives, and more particularly to a high-load transmission belt base adhesive and its preparation method. Background Technology

[0002] As a core component for mechanical power transmission and material conveying, the performance of transmission belts directly determines the reliability, efficiency, and service life of the transmission system. The belt backing, as a crucial structure between the load-bearing layer and the cover layer, not only needs excellent elasticity and adhesion but also must withstand major tensile stresses, resist fatigue damage caused by frequent flexing, and withstand frictional wear from pulleys or materials. In harsh working conditions such as mining, port logistics, and heavy engineering machinery, high-load, high-impact environments place extreme demands on the mechanical strength, wear resistance, and fatigue resistance of the backing. Therefore, developing a transmission belt backing that simultaneously meets the requirements of high strength, high wear resistance, and long fatigue life has significant engineering application value for improving equipment operating safety, reducing maintenance costs, and extending replacement cycles.

[0003] However, traditional formulations commonly used in transmission belt underlays often focus on optimizing single properties, making it difficult to achieve balanced improvements across multiple key indicators. For example, simply increasing the amount of short fibers or fillers can improve modulus and hardness to some extent, but it can easily lead to decreased toughness and increased internal stress, making the rubber more prone to early cracking under dynamic flexural stress. Poor interfacial bonding between fibers and the rubber matrix results in low stress transmission efficiency, limiting its reinforcing effect. Conventional mixing processes may also cause fiber damage or uneven filler dispersion, affecting the uniformity and stability of the final product's performance. Furthermore, the overall performance level of existing products is insufficient to meet the ever-increasing demands for high-power and high-torque transmissions, exhibiting problems such as abnormal elongation or fracture due to insufficient strength, early failure due to excessive wear, and shortened overall lifespan due to fatigue cracking. Therefore, there is an urgent need for a high-performance transmission belt underlay that requires systematic innovation from formulation to manufacturing process, capable of synergistically improving mechanical strength, wear resistance, and fatigue life. Summary of the Invention

[0004] To address the problems existing in the background technology, a high-load transmission belt base adhesive and its preparation method are proposed. Through the synergistic design of the fiber-filler-additive system and controllable process, the strength, wear resistance and fatigue resistance of the belt base adhesive are balanced and improved, providing a reliable material solution for high-load transmission systems.

[0005] This invention proposes a high-load transmission belt base adhesive, comprising, by weight ratio, 100 parts of chloroprene rubber, 10-15 parts of polyvinyl alcohol fiber, 5-8 parts of reinforcing fiber, 30-50 parts of composite filler, 2.5-4.0 parts of silane coupling agent, 4-9 parts of metal oxide, 7-10 parts of functional additives, and 5-8 parts of tear-resistant resin.

[0006] Preferably, the polyvinyl alcohol fiber is of type MM-1 with a diameter of 2-3 mm.

[0007] Preferably, the reinforcing fiber is selected from at least one of nylon fiber and aramid fiber, with an elastic modulus of 100-200 GPa. Preferably, the composite filler is a mixture of EDS type silica and N330 type carbon black in a weight ratio of 1:2.

[0008] Preferably, the silane coupling agent is of type SI69.

[0009] Preferably, the metal oxide is a mixture of magnesium oxide and zinc oxide in a weight ratio of 1:1.5.

[0010] Preferably, each part of the adjuvant includes 3 parts of antioxidant 1010 and 4 parts of anti-aging agent RD.

[0011] Preferably, the tear-resistant resin is type E5051.

[0012] This invention proposes a method for preparing the base adhesive of the above-mentioned high-load transmission belt, the steps of which are as follows: S1. Preparation of masterbatch: Add 1 / 3 part by weight of chloroprene rubber, all polyvinyl alcohol fiber, reinforcing fiber and tear-resistant resin to a mixer and mix for 40-60 seconds at a temperature of 60-100℃ and a speed of 30r / min. After sheeting, the masterbatch is obtained. S2. Preparation of premix: The metal oxide and functional additive are placed in a mixer and stirred at 80-100℃ for 20-30 minutes to obtain mixture A; the silane coupling agent and composite filler are mixed and stirred at room temperature for 15-20 minutes to obtain mixture B. S3. Secondary mixing: Add the remaining chloroprene rubber, mixing masterbatch, and mixture B to the internal mixer and mix for 30-50 seconds at 80-115℃ and 30-50r / min. Then add mixture A and continue secondary mixing for 40-60 seconds. S4. Mixing and Cooling: The rubber compound after secondary internal mixing is fed into a two-roll mill and rough-mixed at 50-80℃ for 40-80 seconds. After sheeting, it is linearly cooled to room temperature at a rate of 1-10℃ / min to obtain the high-load transmission belt base rubber.

[0013] This invention further proposes the application of the aforementioned high-load transmission belt base adhesive in high-load transmission scenarios.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: 1. Significantly Improved Mechanical Strength and Load-Bearing Capacity: Using neoprene rubber as the base, combined with specific specifications of MM-1 type polyvinyl alcohol fiber and high-modulus reinforcing fibers (nylon / aramid), a composite reinforcement system with both toughness, rigidity, and interfacial bonding strength is formed. Test data from Examples 1 to 3 show that the tensile strength gradually increased from 23.5 MPa to 27.6 MPa, all significantly higher than the standard example (≥18 MPa). This is mainly due to the effective stress transfer between the fiber and the rubber matrix, and the reinforcing network formed by the composite fillers (silica and carbon black) under the action of coupling agent SI69, which together support the mechanical performance requirements under high load conditions. 2. Excellent wear resistance and durability: Through a rationally proportioned composite filler system and functional additives (such as antioxidant 1010 and anti-aging agent RD), the wear resistance of the rubber compound is significantly optimized. The wear-resistant volumes of Examples 1 to 3 are 12.3 mm³, 10.1 mm³, and 8.5 mm³, respectively, all lower than the upper limit of the standard example (15 mm³). Furthermore, the wear resistance further improves with increasing reinforcing fiber content and filler ratio. This indicates that the formulation can effectively resist wear and aging during transmission, extending the service life of the conveyor belt under high-speed, high-load operation. 3. Outstanding fatigue resistance: In the Democia flexure test, the fatigue lives of Examples 1 to 3 were 35,000, 42,000, and 48,000 cycles, respectively, all exceeding the requirements of the standard example (≥30,000 cycles). This is attributed to the good compatibility between the reinforcing fiber and the rubber matrix, and the stepwise mixing process which promotes uniform dispersion of the components, reduces internal stress concentration, thereby inhibiting crack initiation and propagation, and adapting to long-term dynamic flexure conditions; 4. Process Rationality and Controllability: The preparation method employs a staged mixing and temperature control process: first, the fibers and a portion of the rubber are pre-bonded through intensive mixing; then, the activated filler and additive system are introduced sequentially, effectively avoiding fiber damage and promoting interfacial bonding; finally, linear cooling reduces internal stress. This process can adapt to adjustments in different formulation ratios (such as the incremental increase of fibers and fillers in Examples 1-3), achieving gradient optimization of performance and meeting diverse load requirements. 5. Comprehensive performance suitable for high-power transmission scenarios: Compared with traditional formulations, this invention achieves simultaneous improvements in three key indicators: tensile strength, wear resistance, and fatigue life, solving the problems of insufficient strength, easy wear, and easy cracking commonly faced by high-load transmission belts. It is especially suitable for harsh working conditions such as mining machinery, heavy-duty conveying systems, and high-torque industrial transmissions, and has high engineering application value. Detailed Implementation

[0015] Example 1: This invention proposes a high-load transmission belt base adhesive. By weight, the core components include 100 parts of chloroprene rubber as the base material, combined with 10 parts of MM-1 type polyvinyl alcohol fiber (2-3 mm thick), and 5 parts of nylon fiber with an elastic modulus of 100-200 GPa. It also contains 2.5 parts of SI69 type silane coupling agent, a filler composed of 10 parts of EDS type silica and 20 parts of N330 type carbon black in a specific ratio, a metal oxide composed of 1.6 parts of magnesium oxide and 2.4 parts of zinc oxide, 3 parts of antioxidant 1010, 4 parts of antioxidant RD, and 5 parts of E5051 type tear-resistant resin as needed.

[0016] Example 2: This invention proposes a high-load transmission belt base adhesive. By weight, the core component contains 100 parts of chloroprene rubber as the base material, combined with 12 parts of MM-1 type polyvinyl alcohol fiber (2-3 mm thick), and 6.5 parts of aramid fiber with an elastic modulus of 100-200 GPa. It also contains 3.2 parts of SI69 type silane coupling agent, a filler composed of 13.3 parts of EDS type silica and 26.7 parts of N330 type carbon black in a specific ratio, a metal oxide composed of 2.4 parts of magnesium oxide and 3.6 parts of zinc oxide, 3 parts of antioxidant 1010, 4 parts of antioxidant RD, and 8 parts of E5051 type tear-resistant resin as needed.

[0017] Example 3: This invention proposes a high-load transmission belt base adhesive. By weight, the core component contains 100 parts of chloroprene rubber as the base material, combined with 15 parts of MM-1 type polyvinyl alcohol fiber (2-3 mm thick), and 8 parts of aramid fiber with an elastic modulus of 100-200 GPa. It also contains 4 parts of SI69 type silane coupling agent, a filler composed of 16.7 parts of EDS type silica and 33.3 parts of N330 type carbon black in a specific ratio, a metal oxide composed of 3.6 parts of magnesium oxide and 5.4 parts of zinc oxide, 3 parts of antioxidant 1010, 4 parts of antioxidant RD, and 6.5 parts of E5051 type tear-resistant resin as needed.

[0018] Example 4: Based on the above examples, the present invention proposes a method for preparing a high-load transmission belt base adhesive, the steps of which are as follows: S1. Preparation of masterbatch: Add 1 / 3 part by weight of chloroprene rubber, all polyvinyl alcohol fiber, reinforcing fiber and tear-resistant resin to a mixer and mix for 40-60 seconds at a temperature of 60-100℃ and a speed of 30r / min. After sheeting, the masterbatch is obtained. S2. Preparation of premix: The metal oxide and functional additive are placed in a mixer and stirred at 80-100℃ for 20-30 minutes to obtain mixture A; the silane coupling agent and composite filler are mixed and stirred at room temperature for 15-20 minutes to obtain mixture B. S3. Secondary mixing: Add the remaining chloroprene rubber, mixing masterbatch, and mixture B to the internal mixer and mix for 30-50 seconds at 80-115℃ and 30-50r / min. Then add mixture A and continue secondary mixing for 40-60 seconds. S4. Mixing and Cooling: The rubber compound after secondary internal mixing is fed into a two-roll mill and rough-mixed at 50-80℃ for 40-80 seconds. After sheeting, it is linearly cooled to room temperature at a rate of 1-10℃ / min to obtain the high-load transmission belt base rubber.

[0019] This test example is based on the high-load transmission belt base rubber from the above embodiments, and related performance tests are conducted. The formulations of the embodiments and standard examples are shown in Table 1: Table 1 1. Tensile strength test Experimental method: According to the national standard GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber", the specimen was prepared into dumbbell-shaped type I specimens and tested at a tensile rate of 500 mm / min at room temperature. The maximum tensile stress at the time of specimen fracture was recorded as the tensile strength. Experimental equipment: Electronic universal testing machine.

[0020] 2. Wear resistance volume test Experimental method: According to the national standard GB / T 1689-2014 "Determination of abrasion resistance of vulcanized rubber or thermoplastic rubber - Akron abrasion method", the sample is in contact with the grinding wheel at a 15° angle and a load of 26.7N is applied. After the sample is rotated and worn to the set mileage, the mass difference before and after wear is weighed and converted into wear-resistant volume by combining the rubber density. Experimental equipment: Akron abrasion tester.

[0021] 3. Fatigue life test Experimental method: According to the national standard GB / T 13934-2006 "Determination of flexural cracking and crack growth of vulcanized rubber or thermoplastic rubber (Demosia type)", the Demosia flexural tester was used to place the specimen under repeated flexural conditions and record the number of flexural cycles when the specimen cracked, which was then converted into fatigue life (ten thousand cycles). Experimental equipment: Demosia flexure testing machine.

[0022] The test results are shown in Table 2: Table 2 The test results above show that the high-load transmission belt base rubber prepared by the present invention, through the combination of various reinforcing fibers and fillers, has better performance than commonly used materials in terms of tensile strength, wear resistance and fatigue life. It can meet the requirements of high-power transmission belts for strength, wear resistance and fatigue resistance, and fully meet the usage requirements of high-load transmission scenarios.

[0023] The embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A high-load transmission belt base adhesive, characterized in that, According to the weight ratio, its components include 100 parts of chloroprene rubber, 10-15 parts of polyvinyl alcohol fiber, 5-8 parts of reinforcing fiber, 30-50 parts of composite filler, 2.5-4.0 parts of silane coupling agent, 4-9 parts of metal oxide, 7-10 parts of functional additives, and 5-8 parts of tear-resistant resin.

2. The high-load transmission belt base adhesive according to claim 1, characterized in that, The polyvinyl alcohol fiber is of type MM-1 and has a diameter of 2-3 mm.

3. The high-load transmission belt base adhesive according to claim 1, characterized in that, The reinforcing fiber is selected from at least one of nylon fiber and aramid fiber, with an elastic modulus of 100-200 GPa.

4. The high-load transmission belt base adhesive according to claim 1, characterized in that, The composite filler is made by mixing EDS type silica and N330 type carbon black in a weight ratio of 1:

2.

5. The high-load transmission belt base adhesive according to claim 1, characterized in that, The silane coupling agent is type SI69.

6. The high-load transmission belt base adhesive according to claim 1, characterized in that, The metal oxide is a mixture of magnesium oxide and zinc oxide in a weight ratio of 1:1.

5.

7. The high-load transmission belt base adhesive according to claim 1, characterized in that, Each dose of the energy supplement includes 3 parts antioxidant 1010 and 4 parts anti-aging agent RD.

8. The high-load transmission belt base adhesive according to claim 1, characterized in that, The tear-resistant resin is type E5051.

9. The method for preparing the high-load transmission belt base adhesive according to claim 1, characterized in that, The steps are as follows: S1. Preparation of masterbatch: Add 1 / 3 part by weight of chloroprene rubber, all polyvinyl alcohol fiber, reinforcing fiber and tear-resistant resin to a mixer and mix for 40-60 seconds at a temperature of 60-100℃ and a speed of 30r / min. After sheeting, the masterbatch is obtained. S2. Preparation of premix: The metal oxide and functional additive are placed in a mixer and stirred at 80-100℃ for 20-30 minutes to obtain mixture A; the silane coupling agent and composite filler are mixed and stirred at room temperature for 15-20 minutes to obtain mixture B. S3. Secondary mixing: Add the remaining chloroprene rubber, mixing masterbatch, and mixture B to the internal mixer and mix for 30-50 seconds at 80-115℃ and 30-50r / min. Then add mixture A and continue secondary mixing for 40-60 seconds. S4. Mixing and Cooling: The rubber compound after secondary internal mixing is fed into a two-roll mill and rough-mixed at 50-80℃ for 40-80 seconds. After sheeting, it is linearly cooled to room temperature at a rate of 1-10℃ / min to obtain the high-load transmission belt base rubber.

10. The high-load transmission belt base adhesive according to claim 1, characterized in that, This product is used in high-load transmission scenarios.

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