Steel cord conveyor belt and processing technology thereof

Abstract

The invention relates to the technical field of rubber materials and discloses a steel cord core conveyor belt and a processing technology thereof. Graphene modified by grafting of siloxane-containing polyimide is blended with silicone rubber. The polysiloxane structure grafted on the surface of the graphene has good compatibility with methyl vinyl silicone rubber, thereby improving the compatibility of the graphene in the silicone rubber and promoting the dispersion of graphene nanoparticles. The evenly dispersed graphene and the rigid polyimide grafted on the surface of the graphene have a synergistic modification effect on the silicone rubber, thereby improving the comprehensive properties of the silicone rubber, such as wear resistance and mechanical strength. The wear-resistant modified silicone rubber is used as the load surface and transmission surface, the steel wire rope is used as the skeleton layer, and the stainless steel mesh is used as the reinforcement layer to obtain a steel cord core conveyor belt with excellent mechanical strength and high wear resistance.

Description

Technical Field

[0001] The invention relates to the technical field of rubber materials, in particular to a steel cord conveyor belt and a processing technology thereof. Background Art

[0002] Conveyor belts are widely used in agriculture, industry, mining, and transportation to transport a variety of solid, bulk, and powdered materials, as well as finished goods. They enable continuous, efficient, and high-angle transport. They are safe to operate, easy to use, and maintain, offering low freight costs. They can also shorten transport distances, reduce project costs, and save manpower and material resources. Currently, conveyor belts are primarily made of materials such as rubber. These belts offer excellent oil and acid resistance, as well as heat and cold resistance. They are widely used in steel, coal mining, and solid material transportation. However, traditional rubber conveyor belts are weak and prone to breakage. Furthermore, their smooth surface can cause slippage, impacting conveyor efficiency. Therefore, there is a need to improve conveyor belts' surface friction resistance and mechanical strength. The conveyor belt of the present invention includes a skeleton layer, the upper end surface of the skeleton layer is provided with an upper covering wear-resistant modified silicone rubber as a load-bearing surface, the surface is provided with anti-slip protrusions, and a reinforcement layer is provided between the skeleton layer and the upper covering rubber layer; the present invention uses steel wire rope as the skeleton layer, stainless steel mesh as the reinforcement layer, and wear-resistant modified silicone rubber as the load-bearing surface and transmission surface to obtain a high-strength and highly wear-resistant steel wire rope core conveyor belt. Summary of the Invention

[0003] (1) Technical problems solved

[0004] In view of the shortcomings of the prior art, the present invention provides a wear-resistant modified silicone rubber as the load surface and conveying surface of the conveyor belt, thereby improving the wear resistance and anti-slip properties of the conveyor belt surface.

[0005] (2) Technical solution

[0006] A steel cord conveyor belt and a processing technology thereof, wherein the steel cord conveyor belt comprises a skeleton layer, the upper end surface of the skeleton layer is provided with an upper covering wear-resistant modified silicone rubber as a load-bearing surface, the surface is provided with anti-slip protrusions, a reinforcement layer is provided between the skeleton layer and the upper covering rubber layer; the lower end surface of the skeleton layer is provided with a lower wear-resistant modified silicone rubber as a transmission surface.

[0007] Preferably, the skeleton layer is made of polyester, nylon or steel wire rope.

[0008] Preferably, the reinforcement layer is a stainless steel mesh, a copper mesh, a carbon steel mesh, an iron mesh or an aluminum alloy mesh.

[0009] Preferably, the anti-slip protrusions are strip-shaped protrusions, herringbone-shaped protrusions, granular protrusions or fan-shaped protrusions.

[0010] Preferably, the preparation method of the wear-resistant modified silicone rubber is:

[0011] (1) Graphene oxide and N,N-dimethylformamide are added to thionyl chloride, stirred and refluxed to obtain acyl chloride-modified graphene; then 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and catalyst triethylamine are added and dissolved in tetrahydrofuran, and then acyl chloride-modified graphene is added and reacted at 35-60 °C for 24-48 h. After the reaction, the mixture is centrifuged and washed with ethanol to obtain aminosiloxane-modified graphene;

[0012] (2) 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and dianhydride polymerization monomers were dissolved in N,N-dimethylacetamide, and then aminosiloxane-modified graphite was added. After uniform dispersion, the mixture was stirred and reacted at room temperature for 6-12 h. Finally, the solution was subjected to step-by-step thermal imidization at the following temperatures: 100 ℃ / 1 h, 150 ℃ / 2 h, 200 ℃ / 2 h, 240 ℃ / 2 h, and 300 ℃ / 1 h, to obtain siloxane-containing polyimide-modified graphene.

[0013] (3) Methyl vinyl silicone rubber and silicone-containing polyimide-modified graphene are plasticized in an open mill, and then diisopropylbenzene peroxide, zinc oxide, sulfur, stearic acid, and antioxidant D are added and mixed. Finally, the material is vulcanized in a flat vulcanizer to obtain wear-resistant modified silicone rubber.

[0014] Preferably, the ratio of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, triethylamine and acyl chloride-modified graphene in (1) is 15-80:3-15:1.

[0015] Preferably, the (2) dianhydride polymerizable monomer includes pyromellitic anhydride, 4,4′-biphenyl ether dianhydride or 3,3′,4,4′-biphenyltetracarboxylic anhydride.

[0016] Preferably, the usage ratio of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, dianhydride polymerization monomer, and aminosiloxane-modified graphite in (2) is 20-60:12-40:1.

[0017] Preferably, the usage ratio of the methyl vinyl silicone rubber and the silicone-containing polyimide-modified graphene in (2) is 1:0.05-0.3.

[0018] (3) Beneficial technical effects

[0019] An amino group of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane is used to undergo amidation reaction with the acyl chloride group of acyl chloride-modified graphene to obtain aminosiloxane-modified graphene. Then, using the amino group as the polymerization site, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and dianhydride polymerization monomer are in situ grafted and polymerized on the graphene surface to generate siloxane-containing polyimide grafted graphene. Further blending with silicone rubber, the polysiloxane structure grafted on the surface of graphene has good compatibility with methyl vinyl silicone rubber, which improves the compatibility of graphene in silicone rubber and promotes the dispersion of graphene nanoparticles. The evenly dispersed graphene and the rigid polyimide grafted on its surface have a synergistic modification effect on the silicone rubber, improving the comprehensive properties of silicone rubber such as wear resistance and mechanical strength. With wear-resistant modified silicone rubber as the load surface and transmission surface, steel wire rope as the skeleton layer, and stainless steel mesh as the reinforcement layer, a steel wire rope core conveyor belt with excellent mechanical strength and high wear resistance is obtained. DETAILED DESCRIPTION Example 1

[0020] (1) 0.2 g of graphene oxide and 2 mL of N,N-dimethylformamide were added to 30 mL of thionyl chloride, stirred and refluxed for 18 h, filtered, and washed with acetone to obtain acyl chloride-modified graphene; then 3 g of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and 0.6 g of catalyst triethylamine were added and dissolved in tetrahydrofuran, and 0.2 g of acyl chloride-modified graphene was added and reacted at 60 °C for 24 h. After the reaction, the mixture was centrifuged and washed with ethanol to obtain aminosiloxane-modified graphene;

[0021] (2) 4 g of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and 2.4 g of pyromellitic anhydride were dissolved in N,N-dimethylacetamide, and then 0.2 g of aminosiloxane-modified graphite was added. After uniform dispersion, the mixture was stirred and reacted at room temperature for 12 h. Finally, the solution was subjected to step-by-step thermal imidization at the following temperatures: 100 ℃ / 1 h, 150 ℃ / 2 h, 200 ℃ / 2 h, 240 ℃ / 2 h, and 300 ℃ / 1 h to obtain siloxane-containing polyimide-modified graphene.

[0022] (3) 100 g of methyl vinyl silicone rubber and 5 g of silicone-containing polyimide-modified graphene were plasticized in an open mill, and then 2 g of diisopropylbenzene peroxide, 3 g of zinc oxide, 1.5 g of sulfur, 2 g of stearic acid, and 1 g of antioxidant D were added and mixed. Finally, the material was vulcanized in a flat vulcanizer to obtain wear-resistant modified silicone rubber.

[0023] (4) The conveyor belt uses steel wire rope as the skeleton layer. The upper end surface of the skeleton layer is provided with an upper covering wear-resistant modified silicone rubber as the load-bearing surface, and the surface has granular protrusions; a copper mesh reinforcement layer is provided between the skeleton layer and the upper covering rubber layer; the lower end surface of the skeleton layer is provided with a lower wear-resistant modified silicone rubber as the transmission surface. Example 2

[0024] (1) 0.2 g of graphene oxide and 2 mL of N,N-dimethylformamide were added to 30 mL of thionyl chloride, stirred and refluxed for 18 h, filtered, and washed with acetone to obtain acyl chloride-modified graphene; then 8 g of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and 2 g of catalyst triethylamine were added and dissolved in tetrahydrofuran, and 0.2 g of acyl chloride-modified graphene was added and reacted at 40 °C for 48 h. After the reaction, the mixture was centrifuged and washed with ethanol to obtain aminosiloxane-modified graphene;

[0025] (2) 8 g of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and 5 g of 4,4′-biphenyl ether dianhydride were dissolved in N,N-dimethylacetamide, and then 0.2 g of aminosiloxane-modified graphite was added. After uniform dispersion, the mixture was stirred and reacted at room temperature for 12 h. Finally, the solution was subjected to step-by-step thermal imidization at the following temperatures: 100 ℃ / 1 h, 150 ℃ / 2 h, 200 ℃ / 2 h, 240 ℃ / 2 h, and 300 ℃ / 1 h to obtain siloxane-containing polyimide-modified graphene.

[0026] (3) 100 g of methyl vinyl silicone rubber and 15 g of silicone-containing polyimide-modified graphene were plasticized in an open mill, and then 3 g of diisopropylbenzene peroxide, 2.5 g of zinc oxide, 1.5 g of sulfur, 1 g of stearic acid, and 1 g of antioxidant D were added and mixed. Finally, the material was vulcanized in a flat vulcanizer to obtain wear-resistant modified silicone rubber.

[0027] (4) The conveyor belt uses steel wire rope as the skeleton layer. The upper end surface of the skeleton layer is provided with an upper covering wear-resistant modified silicone rubber as the load-bearing surface, and the surface has granular protrusions; a copper mesh reinforcement layer is provided between the skeleton layer and the upper covering rubber layer; the lower end surface of the skeleton layer is provided with a lower wear-resistant modified silicone rubber as the transmission surface. Example 3

[0028] (1) 0.2 g of graphene oxide and 2 mL of N,N-dimethylformamide were added to 30 mL of thionyl chloride, stirred and refluxed for 18 h, filtered, and washed with acetone to obtain acyl chloride-modified graphene; then 16 g of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and 3 g of catalyst triethylamine were added and dissolved in tetrahydrofuran, and 0.2 g of acyl chloride-modified graphene was added and reacted at 40 °C for 48 h. After the reaction, the mixture was centrifuged and washed with ethanol to obtain aminosiloxane-modified graphene;

[0029] (2) 12 g of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and 8 g of pyromellitic anhydride were dissolved in N,N-dimethylacetamide, and then 0.2 g of aminosiloxane-modified graphite was added. After uniform dispersion, the mixture was stirred and reacted at room temperature for 10 h. Finally, the solution was subjected to step-by-step thermal imidization at the following temperatures: 100 °C / 1 h, 150 °C / 2 h, 200 °C / 2 h, 240 °C / 2 h, and 300 °C / 1 h to obtain siloxane-containing polyimide-modified graphene.

[0030] (3) 100 g of methyl vinyl silicone rubber and 30 g of silicone-containing polyimide-modified graphene were plasticized in an open mill, and then 2.5 g of diisopropylbenzene peroxide, 3 g of zinc oxide, 0.8 g of sulfur, 1 g of stearic acid, and 1.5 g of antioxidant D were added and mixed. Finally, the material was vulcanized in a flat vulcanizer to obtain wear-resistant modified silicone rubber.

[0031] (4) The conveyor belt uses steel wire rope as the skeleton layer. The upper end surface of the skeleton layer is provided with an upper covering wear-resistant modified silicone rubber as the load-bearing surface, and the surface has granular protrusions; a copper mesh reinforcement layer is provided between the skeleton layer and the upper covering rubber layer; the lower end surface of the skeleton layer is provided with a lower wear-resistant modified silicone rubber as the transmission surface.

[0032] Comparative Example 1

[0033] (1) 100 g of methyl vinyl silicone rubber and 5 g of graphene were plasticized in an open mill, and then 2 g of diisopropylbenzene peroxide, 2 g of zinc oxide, 1.5 g of sulfur, 1 g of stearic acid, and 2 g of antioxidant D were added and mixed. Finally, the material was vulcanized in a flat vulcanizer to obtain graphene-modified silicone rubber.

[0034] (2) The steel wire rope is used as the skeleton layer, and the upper end surface of the skeleton layer is provided with an upper covering graphene modified silicone rubber as the load surface, and the surface has granular protrusions; a copper mesh reinforcement layer is provided between the skeleton layer and the upper covering rubber layer; and the lower end surface of the skeleton layer is provided with a lower wear-resistant modified silicone rubber as the transmission surface.

[0035] Comparative Example 2

[0036] (1) 8 g of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and 4 g of 3,3',4,4'-biphenyltetracarboxylic dianhydride were dissolved in N,N-dimethylacetamide and stirred at room temperature for 12 h. Finally, the solution was subjected to step-by-step thermal imidization at the following temperatures: 100 °C / 1 h, 150 °C / 2 h, 200 °C / 2 h, 240 °C / 2 h, and 300 °C / 1 h to obtain a siloxane-containing polyimide.

[0037] (2) 100 g of methyl vinyl silicone rubber and 5 g of silicone-containing polyimide were plasticized in an open mill, and then 2.5 g of diisopropylbenzene peroxide, 3 g of zinc oxide, 1 g of sulfur, 2 g of stearic acid, and 2 g of antioxidant D were added and mixed. Finally, the material was vulcanized in a flat vulcanizer to obtain silicone-containing polyimide-modified silicone rubber.

[0038] (3) The steel wire rope is used as the skeleton layer, and the upper end surface of the skeleton layer is provided with an upper covering silicone rubber containing siloxane polyimide as the load-bearing surface, and granular protrusions are provided on the surface of the silicone rubber; a copper mesh reinforcement layer is provided between the skeleton layer and the upper covering rubber layer; and the lower end surface of the skeleton layer is provided with a lower wear-resistant modified silicone rubber as the transmission surface.

[0039] A universal testing machine is used to test the tensile and flexural strength of conveyor belts. The test methods are based on GB / T1040.1-2018 and GB / T 9341-2008 standards.

[0040] The Shore A hardness of the conveyor belt was tested using a Shore durometer. The test method was in accordance with GB / T 531.1-2008.

[0041] A rubber abrasion tester was used to test the conveyor belt wear. The weight load was 2.5 N. The test method was based on GB / T9867-2008.

[0042]

[0043] The conveyor belt of Example 3 has the best wear resistance, with a wear loss of only 0.0192 cm 3 km -1 The Shore A hardness of the conveyor belt of Example 2 reaches 86, and the maximum tensile strength and bending strength reach 80.8 MPa and 96.7 MPa, which are much higher than those of the conveyor belts of Comparative Examples 1 and 2.

Claims

1. A steel cord conveyor belt, characterized by: The steel cord conveyor belt comprises a skeleton layer, wherein the upper end surface of the skeleton layer is provided with an upper covering wear-resistant modified silicone rubber as a load-bearing surface, and the surface is provided with anti-slip protrusions, and a reinforcement layer is provided between the skeleton layer and the upper covering rubber layer; the lower end surface of the skeleton layer is provided with a lower wear-resistant modified silicone rubber as a transmission surface; The preparation method of the wear-resistant modified silicone rubber is: (1) adding graphene oxide and N,N-dimethylformamide to thionyl chloride, stirring and refluxing to obtain acyl chloride-modified graphene; then adding 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and catalyst triethylamine to dissolve in tetrahydrofuran, and then adding acyl chloride-modified graphene, reacting at 35-60° C. for 24-48 hours, centrifuging after the reaction, and washing with ethanol to obtain aminosiloxane-modified graphene; (2) dissolving 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and dianhydride polymerization monomers in N,N-dimethylacetamide, then adding aminosiloxane-modified graphene, stirring and reacting at room temperature for 6-12 hours after uniform dispersion, and finally subjecting the solution to stepwise thermal imidization at a temperature of 100°C / 1 hour, 150°C / 2 hours, 200°C / 2 hours, 240°C / 2 hours, and 300°C / 1 hour, to obtain siloxane-containing polyimide-modified graphene; (3) Methyl vinyl silicone rubber and silicone-containing polyimide-modified graphene are plasticized in an open mill, and then diisopropylbenzene peroxide, zinc oxide, sulfur, stearic acid, and antioxidant D are added and mixed. Finally, the material is vulcanized in a flat vulcanizer to obtain wear-resistant modified silicone rubber.

2. The steel cord conveyor belt according to claim 1, characterized in that: The skeleton layer is made of polyester, nylon or steel wire rope.

3. The steel cord conveyor belt according to claim 1, characterized in that: The reinforcement layer is a stainless steel mesh, a copper mesh, a carbon steel mesh, an iron mesh or an aluminum alloy mesh.

4. The steel cord conveyor belt according to claim 1, characterized in that: The anti-slip protrusions are strip-shaped protrusions, herringbone-shaped protrusions, granular protrusions or fan-shaped protrusions.

5. The steel cord conveyor belt according to claim 1, characterized in that: In step (1), the ratio of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, triethylamine and acyl chloride-modified graphene is 15-80:3-15:

1.

6. The steel cord conveyor belt according to claim 1, characterized in that: The dianhydride polymerization monomer in step (2) includes pyromellitic anhydride, 4,4'-biphenyl ether dianhydride or 3,3',4,4'-biphenyltetracarboxylic anhydride.

7. The steel cord conveyor belt according to claim 1, characterized in that: In step (2), the usage ratio of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, dianhydride polymerization monomer, and aminosiloxane-modified graphene is 20-60:12-40:

1.

8. The steel cord conveyor belt according to claim 1, characterized in that: In step (2), the usage ratio of methyl vinyl silicone rubber and siloxane-containing polyimide-modified graphene is 1:0.05-0.3.

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