Oil-resistant PVC conveying belt surface layer material and light conveying belt
By combining modified alumina and modified silicone oil with polyvinyl chloride resin, a stable dispersion system is formed, which solves the problem of poor oil resistance of PVC conveyor belt surface material and improves the material's wear resistance, mechanical properties, and thermal stability.
Patent Information
- Application Number
- CN202511439781.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-10
- Publication Date
- 2025-12-19
AI Technical Summary
Existing PVC conveyor belt surface materials have poor oil resistance and are easily corroded and swollen by chemical reagents and oily substances, leading to material hardening, cracking and failure.
Modified silicone oil was prepared by combining modified alumina and modified silicone oil with polyvinyl chloride resin, plasticizer, antistatic agent, etc., through hydrosilylation reaction. The modified silicone oil was then loaded with zirconium-based metal-organic framework UiO-66 to enhance the compatibility and dispersibility of the material and form a stable dispersion system.
It improves the oil resistance, wear resistance, mechanical properties and thermal stability of PVC conveyor belt surface material, enhances the material's flexibility and lubricity, and strengthens the material's overall performance.
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of conveyor belt technology, specifically relating to oil-resistant PVC conveyor belt surface material and lightweight conveyor belts. Background Technology
[0002] Lightweight conveyor belts are characterized by their thin and light body, good dimensional stability, high tension, bright colors, and safety and non-toxicity. They are widely used in industries such as food, pharmaceuticals, tobacco, postal services, and logistics, serving as conveyors for goods, factory production lines, and agricultural and sideline product processing. Therefore, they are also known as process belts.
[0003] The advent and development of lightweight conveyor belts has spurred the rubber belt industry, which primarily uses rubber, to move towards composite plastics. Composite conveyor belts, made with PVC plastic, PU elastomer, polyamide, or SBS thermoplastic elastomer as the cover rubber and polyester, polyamide, aramid fabrics or sheets, or non-woven fabrics as the core, not only reduce raw material consumption but also save on power consumption during conveyor belt operation. They are undoubtedly high-quality conveyor belt products that align with energy conservation and emission reduction policies.
[0004] PVC lightweight conveyor belts use a cover rubber as the surface material and polyester, polyamide, or other synthetic fiber canvas as the skeleton material. They are mainly used to transport light and medium-weight materials and are widely popular due to their lightweight, easy processing, durability, and acid and alkali resistance. However, lightweight conveyor belts using PVC resin as the surface material are often susceptible to corrosion and swelling from chemical reagents and oily substances. In particular, plasticizers used in the PVC resin processing are easily extracted and precipitated by solvents, causing the PVC coating material to harden, crack, and fail. Therefore, providing an oil-resistant PVC conveyor belt surface material and a lightweight conveyor belt is a technical problem that needs to be solved. Summary of the Invention
[0005] This invention provides an oil-resistant PVC conveyor belt surface material and a lightweight conveyor belt, which can solve the problem of poor oil resistance in existing PVC conveyor belt surface materials.
[0006] The objective of this invention can be achieved through the following technical solutions: Oil-resistant PVC conveyor belt surface material comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin; Stabilizer 5 parts; Plasticizer 25-30 parts; 10-20 parts of modified alumina; 3-5 parts modified silicone oil; 2-4 parts antistatic agent; Antioxidant 0.5-1 part.
[0007] Furthermore, the modified alumina is an alumina-supported zirconium-based metal-organic framework.
[0008] Furthermore, the modified silicone oil is obtained by hydrosilylation reaction of hydrogen-containing silicone oil, allyl glycidyl ether, and N-(3-dimethylaminopropyl)methacrylamide.
[0009] Furthermore, the plasticizer is a polyester plasticizer, which has the characteristics of large molecular weight, resistance to extraction and non-migration, and is specifically at least one of polyester plasticizer UN610, polyester plasticizer UN615, polyester plasticizer UN620 and polyester plasticizer UN630, preferably polyester plasticizer UN615.
[0010] Furthermore, the method for preparing the modified alumina includes the following steps: Terephthalic acid was dissolved in N,N-dimethylformamide and stirred for 20-30 min. Zirconium tetrachloride was then added and stirred for another 30 min. Alumina was then added and stirred for another 30 min. Acetic acid was then added and stirred for another 1 h. The mixture was then transferred to a reaction vessel and reacted at 120 °C for 24 h. After the reaction was completed, the mixture was filtered, and the filter cake was washed with methanol and dried to obtain modified alumina.
[0011] Alumina has a high Mohs hardness and strong wear resistance, but it is prone to agglomeration. Based on this, the present invention loads zirconium-based metal-organic framework UiO-66 onto the surface of alumina. UiO-66 has certain organic properties and good compatibility with polyvinyl chloride (PVC). The nano-alumina loaded with UiO-66 can better interact with PVC to form a more stable and uniform dispersion system, which is like building a bridge between PVC and alumina, enhancing their compatibility and binding force, and thus improving the dispersibility of nano-alumina in PVC.
[0012] Furthermore, in the preparation process of the modified alumina, the ratio of terephthalic acid, N,N-dimethylformamide, zirconium tetrachloride, alumina and acetic acid is 0.38g:45-65mL:0.53g:4.5-9.0g:6mL.
[0013] Furthermore, the alumina is nano-alumina.
[0014] Furthermore, the method for preparing the modified silicone oil includes the following steps: Hydrogen-containing silicone oil and chloroplatinic acid catalyst were added to a flask, a condenser was connected, and the temperature was raised to 80°C under nitrogen protection. A toluene solution of allyl glycidyl ether was added dropwise. After the addition was complete, the temperature was raised to 120°C and the reaction was carried out for 4-6 hours. Then, a toluene solution of N-(3-dimethylaminopropyl)methacrylamide was added dropwise. After the addition was complete, the temperature was raised to 120°C and the reaction was carried out for 10-12 hours. After the reaction was completed, toluene was removed by vacuum distillation. The distillation product was added to n-hexane, stirred evenly, centrifuged, and the precipitate was removed. The n-hexane was removed by vacuum distillation to obtain modified silicone oil.
[0015] Furthermore, in the preparation process of the modified silicone oil, the molar ratio of Si-H groups, allyl glycidyl ether, and N-(3-dimethylaminopropyl)methacrylamide in the hydrogen-containing silicone oil is 1-1.1:0.5-0.7:0.3-0.5. Under the action of chloroplatinic acid catalyst, allyl glycidyl ether and N-(3-dimethylaminopropyl)methacrylamide are grafted onto the side face of the hydrogen-containing silicon oxide via hydrosilylation reaction to obtain a modified silicone oil carrying a tertiary amine structure and epoxy groups.
[0016] Furthermore, the active hydrogen mass fraction in the hydrogen-containing silicone oil is 0.5-1.6%.
[0017] Furthermore, the amount of the chloroplatinic acid catalyst is 3-6% of the mass of the hydrogen-containing silicone oil.
[0018] Furthermore, the chloroplatinic acid catalyst is a chloroplatinic acid isopropanol solution with a mass fraction of 1-5%.
[0019] Furthermore, the stabilizer is a calcium-zinc stabilizer, model CZX-683, purchased from Sendeli Environmental New Materials Technology Co., Ltd.
[0020] Furthermore, the antistatic agent is KJ-100.
[0021] Furthermore, the antioxidant is one or more of antioxidant 1010, antioxidant 1076, antioxidant 1024 and antioxidant 1035.
[0022] Furthermore, the polyvinyl chloride resin is PVC, S-1000, purchased from Qilu Petrochemical Chlor-Alkali Plant.
[0023] Furthermore, the oil-resistant PVC conveyor belt surface material is made through the following steps: S1. Add polyvinyl chloride resin, stabilizer, plasticizer, modified alumina, modified silicone oil and antistatic agent to a mixer, at a temperature of 90-100℃ and a speed of 1000-1500r / min, stir and mix for 10min to obtain a mixture; S2. Place the mixture on a two-roll open mill for processing at a roll temperature of 150-170℃ for 7-10 minutes. Then, cut the mixture into sheets and vulcanize them using a flat vulcanizing machine at a vulcanizing temperature of 170-180℃, a vulcanizing pressure of 8-10MPa, and a vulcanizing time of 7-10 minutes. Remove the sheets and cool them to room temperature to obtain an oil-resistant PVC conveyor belt surface material.
[0024] A lightweight conveyor belt includes a belt core and a cover rubber, wherein the cover rubber is the aforementioned oil-resistant PVC conveyor belt surface material.
[0025] The beneficial effects of this invention are: 1. This invention provides an oil-resistant PVC conveyor belt surface material, which is made of polyvinyl chloride resin, stabilizer, plasticizer, modified alumina, modified silicone oil and antistatic agent. The plasticizer is a polyester plasticizer with a large molecular weight, which is resistant to extraction and does not easily migrate, and can improve the flexibility of PVC material. The main function of modified alumina is to improve the hardness of the surface material. The modified silicone oil gives the surface material good lubricity. Thanks to the synergistic effect between the above components, the PVC conveyor belt surface material provided by this invention has good oil resistance, wear resistance, mechanical properties and thermal stability.
[0026] 2. The modified silicone oil in this invention contains abundant Si-O-Si segments, tertiary amine structures, and epoxy groups. The Si-O-Si segments of the modified silicone oil form strong hydrogen bonds with the α-H on the polyvinyl chloride resin backbone and the C=O in the polyester plasticizer, improving the entanglement between the polyvinyl chloride resin, the modified silicone oil, and the plasticizer, further enhancing the stability of the plasticizer, and thus giving the surface material excellent oil resistance. The epoxy groups effectively adsorb HCl generated by the poor thermal stability of polyvinyl chloride molecules, thereby inhibiting the thermal degradation of polyvinyl chloride molecules. The tertiary amine is a basic group and easily combines with acidic gas HCl, further improving the thermal stability of polyvinyl chloride molecules. In addition, the Si-O-Si segments have good flexibility and can synergistically exert a toughening effect with the plasticizer. Therefore, the modified silicone oil significantly improves the thermal stability and oil resistance of the surface material through multiple mechanisms.
[0027] 3. In this invention, the modified alumina is a zirconium-based metal-organic framework UiO-66 supported on alumina, which has good dispersion properties in the matrix. The hydrogen bonding between the carboxyl groups in UiO-66 and the polyvinyl chloride resin significantly improves the compatibility between alumina and polyvinyl chloride resin, enabling the modified alumina to effectively play a reinforcing role and improve the mechanical properties of the surface layer material. In addition, UiO-66 has good adsorption properties for gases and can adsorb HCl generated by polyvinyl chloride molecules due to poor thermal stability. It works synergistically with the aforementioned modified silicone oil to jointly improve the thermal stability of the surface layer material. Detailed Implementation
[0028] To make the technical problems, technical solutions, and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0029] It should be understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the implementation regulations of this application.
[0030] The weights of the relevant components mentioned in the embodiments of this application can refer not only to the specific content of each component, but also to the proportional relationship between the weights of the components. Therefore, any scaling up or down of the content of the relevant components according to the embodiments of this application is within the scope disclosed in the embodiments of this application. Specifically, the mass described in the embodiments of this application can be a mass unit known in the chemical industry, such as μg, mg, g, or kg.
[0031] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.
[0032] In this application, the polyvinyl chloride resin is PVC S-1000, purchased from Qilu Petrochemical Chlor-Alkali Plant; the stabilizer is calcium-zinc stabilizer, model CZX-683, purchased from Sendeli Environmental New Material Technology Co., Ltd.; the hydrogen-containing silicone oil is 0.5% hydroxyl-containing silicone oil (0.5% PHMS, of which the mass fraction of H is 0.5%). All other raw materials, reagents, instruments and equipment used can be purchased from the market or prepared by existing methods.
[0033] The technical solution of this application will be illustrated below through specific embodiments and comparative examples.
[0034] Preparation Example 1 This preparation example provides a modified alumina, and the preparation steps are as follows: 0.38 g of terephthalic acid was dissolved in 45 mL of N,N-dimethylformamide. After stirring for 20 min, 0.53 g of zirconium tetrachloride was added, and stirring was continued for 30 min. Then, 4.5 g of nano-alumina was added, and stirring was continued for 30 min. Then, 6 mL of acetic acid was added, and stirring was continued for 1 h. The mixture was then transferred to a reaction vessel and reacted at 120 °C for 24 h. After the reaction was completed, the mixture was filtered, and the filter cake was washed with methanol and dried to obtain modified alumina.
[0035] Preparation Example 2 This preparation example provides a modified alumina, and the preparation steps are as follows: 0.38 g of terephthalic acid was dissolved in 50 mL of N,N-dimethylformamide. After stirring for 25 min, 0.53 g of zirconium tetrachloride was added. After stirring for another 30 min, 7.0 g of nano-alumina was added. After stirring for another 30 min, 6 mL of acetic acid was added. After stirring for another 1 h, the mixture was transferred to a reaction vessel and reacted at 120 °C for 24 h. After the reaction was completed, the mixture was filtered, and the filter cake was washed with methanol and dried to obtain modified alumina.
[0036] Preparation Example 3 This preparation example provides a modified alumina, and the preparation steps are as follows: 0.38 g of terephthalic acid was dissolved in 65 mL of N,N-dimethylformamide. After stirring for 30 min, 0.53 g of zirconium tetrachloride was added, and stirring was continued for another 30 min. Then, 9.0 g of nano-alumina was added, and stirring was continued for another 30 min. After that, 6 mL of acetic acid was added, and stirring was continued for another 1 h. The mixture was then transferred to a reaction vessel and reacted at 120 °C for 24 h. After the reaction was completed, the mixture was filtered, and the filter cake was washed with methanol and dried to obtain modified alumina.
[0037] Compare with Example 1 This comparative example provides a blend of nano-alumina and metal-organic framework UiO-66, and the specific preparation process is as follows: Add nano-alumina and metal-organic framework UiO-66 to a mixer at a mass ratio of 4.5:3.7 and mix at 200 rpm for 30 minutes.
[0038] Compare with Example 2 This comparative example is nano-alumina.
[0039] Example 1 Oil-resistant PVC conveyor belt surface material comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin; Stabilizer 5 parts; Polyester plasticizer UN615 25 parts; Ten parts of the modified alumina of Preparation Example 1 were prepared. 3 parts modified silicone oil; The antistatic agent is 2 parts of KJ-100; Antioxidant 1010 0.5 parts.
[0040] The modified silicone oil preparation steps are as follows: 100g of hydrogen-containing silicone oil and 3g of chloroplatinic acid catalyst (a 5% isopropanol chloroplatinic acid solution) were added to a flask. A condenser was connected, and the mixture was heated to 80°C under nitrogen protection. A solution consisting of 0.25 mol allyl glycidyl ether and 30 mL toluene was added dropwise. After the addition was complete, the temperature was raised to 120°C and the reaction was carried out for 4 hours. Then, a solution consisting of 0.25 mol N-(3-dimethylaminopropyl)methacrylamide and 80 mL toluene was added dropwise. After the addition was complete, the temperature was raised to 120°C and the reaction was carried out for 10 hours. After the reaction was completed, toluene was removed by vacuum distillation. The distillation product was added to n-hexane, stirred evenly, centrifuged, and the precipitate was removed. The n-hexane was then removed by vacuum distillation to obtain the modified silicone oil.
[0041] The above-mentioned oil-resistant PVC conveyor belt surface material is made through the following steps: S1. Add polyvinyl chloride resin, stabilizer, plasticizer, modified alumina, modified silicone oil and antistatic agent to a mixer, at a temperature of 90℃ and a speed of 1000r / min, stir and mix for 10min to obtain a mixture; S2. The mixture is placed on a two-roll open mill for processing at a roll temperature of 150°C for 10 minutes. After processing, the mixture is sheeted and vulcanized using a flat vulcanizing machine at a vulcanization temperature of 170°C, a vulcanization pressure of 8MPa, and a vulcanization time of 7 minutes. The sheet is then removed and cooled to room temperature to obtain an oil-resistant PVC conveyor belt surface material.
[0042] Example 2 Oil-resistant PVC conveyor belt surface material comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin; Stabilizer 5 parts; Polyester plasticizer UN615, 28 parts; 15 parts of the modified alumina of Preparation Example 1 were prepared; 4 parts modified silicone oil; The antistatic agent is 3 parts of KJ-100; Antioxidant 1010 0.5 parts.
[0043] The preparation steps for the modified silicone oil are the same as in Example 1.
[0044] The above-mentioned oil-resistant PVC conveyor belt surface material is made through the following steps: S1. Add polyvinyl chloride resin, stabilizer, plasticizer, modified alumina, modified silicone oil and antistatic agent to a mixer, at a temperature of 95℃ and a speed of 1200r / min, stir and mix for 10min to obtain a mixture; S2. The mixture is placed on a two-roll open mill for processing at a roll temperature of 160℃ for 9 minutes. After processing, the mixture is sheeted and vulcanized using a flat vulcanizing machine at a vulcanization temperature of 175℃, a vulcanization pressure of 9MPa, and a vulcanization time of 8 minutes. The sheet is then removed and cooled to room temperature to obtain an oil-resistant PVC conveyor belt surface material.
[0045] Example 3 Oil-resistant PVC conveyor belt surface material comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin; Stabilizer 5 parts; Polyester plasticizer UN615 30 parts; 20 parts of the modified alumina of Preparation Example 1 were prepared; 5 parts modified silicone oil; The antistatic agent is 4 parts of KJ-100; Antioxidant 1010 0.5 parts.
[0046] The preparation steps for the modified silicone oil are the same as in Example 1.
[0047] The above-mentioned oil-resistant PVC conveyor belt surface material is made through the following steps: S1. Add polyvinyl chloride resin, stabilizer, plasticizer, modified alumina, modified silicone oil and antistatic agent to a mixer, at a temperature of 100℃ and a speed of 1500r / min, and stir for 10min to obtain a mixture; S2. Place the mixture on a two-roll open mill for processing at a roll temperature of 170℃ for 10 minutes. Then, cut the mixture into sheets and vulcanize them using a flat vulcanizing machine at a vulcanizing temperature of 180℃, a vulcanizing pressure of 8-10MPa, and a vulcanizing time of 10 minutes. Remove the sheets and cool them to room temperature to obtain an oil-resistant PVC conveyor belt surface material.
[0048] Example 4 The oil-resistant PVC conveyor belt surface material differs from Example 2 only in that the modified alumina in Example 2 is replaced with the product obtained in Preparation Example 2.
[0049] Example 5 The oil-resistant PVC conveyor belt surface material differs from Example 2 only in that the modified alumina in Example 2 is replaced with the product obtained in Preparation Example 3.
[0050] Example 6 The oil-resistant PVC conveyor belt surface material differs from that in Example 2 only in the preparation steps of the modified silicone oil. The preparation steps of the modified silicone oil in this example are as follows: 100g of hydrogen-containing silicone oil and 4g of chloroplatinic acid catalyst (3% by mass) were added to a flask. The chloroplatinic acid catalyst was a chloroplatinic acid isopropanol solution. A condenser was connected, and under nitrogen protection, the temperature was raised to 80℃. A solution consisting of 0.3mol allyl glycidyl ether and 40mL toluene was added dropwise. After the addition was complete, the temperature was raised to 120℃ and the reaction was carried out for 5 hours. Then, a solution consisting of 0.2mol N-(3-dimethylaminopropyl)methacrylamide and 70mL toluene was added dropwise. After the addition was complete, the temperature was raised to 120℃ and the reaction was carried out for 11 hours. After the reaction was completed, toluene was removed by vacuum distillation. The distillation product was added to n-hexane, stirred evenly, centrifuged, and the precipitate was removed. The n-hexane was removed by vacuum distillation to obtain the modified silicone oil.
[0051] Example 7 The oil-resistant PVC conveyor belt surface material differs from that in Example 2 only in the preparation steps of the modified silicone oil. The preparation steps of the modified silicone oil in this example are as follows: 100g of hydrogen-containing silicone oil and 6g of chloroplatinic acid catalyst (1% by mass) were added to a flask. The chloroplatinic acid catalyst was a 1% isopropanol solution of chloroplatinic acid. A condenser was connected, and the mixture was heated to 80°C under nitrogen protection. A solution consisting of 0.35 mol allyl glycidyl ether and 50 mL toluene was added dropwise. After the addition was complete, the temperature was raised to 120°C and the reaction was carried out for 6 hours. Then, a solution consisting of 0.15 mol N-(3-dimethylaminopropyl)methacrylamide and 80 mL toluene was added dropwise. After the addition was complete, the temperature was raised to 120°C and the reaction was carried out for 12 hours. After the reaction was completed, the toluene was removed by vacuum distillation. The distillation product was added to n-hexane, stirred evenly, centrifuged, and the precipitate was removed. The n-hexane was then removed by vacuum distillation to obtain the modified silicone oil.
[0052] Example 8 The oil-resistant PVC conveyor belt surface material differs from that in Example 4 only in the preparation steps of the modified silicone oil. The preparation steps of the modified silicone oil in this example are as follows: 100g of hydrogen-containing silicone oil and 6g of chloroplatinic acid catalyst (a 5% isopropanol chloroplatinic acid solution) were added to a flask. A condenser was connected, and the mixture was heated to 80°C under nitrogen protection. A solution consisting of 0.35mol allyl glycidyl ether and 50mL toluene was added dropwise. After the addition was complete, the temperature was raised to 120°C and the reaction was carried out for 6 hours. Then, a solution consisting of 0.25mol N-(3-dimethylaminopropyl)methacrylamide and 80mL toluene was added dropwise. After the addition was complete, the temperature was raised to 120°C and the reaction was carried out for 12 hours. After the reaction was completed, toluene was removed by vacuum distillation. The distillation product was added to n-hexane, stirred evenly, centrifuged, and the precipitate was removed. The n-hexane was then removed by vacuum distillation to obtain the modified silicone oil.
[0053] Comparative Example 1 The oil-resistant PVC conveyor belt surface material differs from Example 1 only in that the modified alumina in Example 1 is replaced with the product prepared in Control Example 1 by an equal mass.
[0054] Comparative Example 2 The oil-resistant PVC conveyor belt surface material differs from Example 1 only in that the modified alumina in Example 1 is replaced with the same mass of the substance in Control Example 2.
[0055] Comparative Example 3 The oil-resistant PVC conveyor belt surface material differs from Example 1 only in that allyl glycidyl ether in Example 1 is replaced with an equimolar amount of N-(3-dimethylaminopropyl)methacrylamide.
[0056] Comparative Example 4 The oil-resistant PVC conveyor belt surface material differs from that in Example 1 only in that N-(3-dimethylaminopropyl)methacrylamide in Example 1 is replaced with an equimolar amount of allyl glycidyl ether.
[0057] Comparative Example 5 The oil-resistant PVC conveyor belt surface material differs from Example 1 only in that the modified silicone oil in Example 1 is replaced with an equivalent amount of polyester plasticizer UN615.
[0058] The performance of the oil-resistant PVC conveyor belt surface materials obtained in Examples 1-8 and Comparative Examples 1-5 was tested. The test items are as follows: (1) Tensile strength: Tested according to GB / T 528-1998, tensile rate 50 mm / min; (2) Impact strength: Tested according to GB / T 1043-1993; (3) Oil resistance: The test was conducted at 25°C. The test piece was immersed in n-hexane for 48 hours, then removed, washed with distilled water, dried, weighed, and the mass loss rate was calculated. (4) Wear resistance: The wear test sample was cut into a circular piece with a thickness of 30 mm and a diameter of 100 mm. The circular piece was dry-rubbed with a 200# sand belt for 1 hour under the conditions of a rotation speed of 100 r / min and a load of 10 N, and the mass loss was tested. (5) Static hot air aging performance test: The test sample was placed in the GT-7035-UA aging test chamber with environmental parameters of 120℃ and 168h; the change rate of tensile strength before and after aging was tested. The test results are shown in Table 1: Table 1 As can be seen from the data recorded in Table 1, the tensile strength of the PVC conveyor belt surface material obtained in Examples 1-3 is 17.8-18.6 MPa, and the impact strength is 15.4-16.5 kJ / m. 2 The mass loss rate in n-hexane is ≤0.15% over 48 hours, the wear is ≤1.6mg, and the tensile strength change rate at 120℃ for 168 hours is ≤1.53%. It has good mechanical properties, oil resistance, wear resistance, and heat oxidation resistance. Among them, Example 2 has the best overall performance. As can be seen from the test results of Examples 2, 4, and 5, the performance of the PVC conveyor belt surface material finally prepared in Examples 2 and 3 is improved compared with the modified alumina obtained by Preparation Example 1. Based on the test results of Examples 2, 6, and 7, as well as Examples 4 and 8, it can be seen that the modified silicone oils obtained by different preparation methods produce PVC conveyor belt surface material with different properties. Based on the test results of Example 1 and Comparative Examples 1 and 2, it can be seen that neither physically mixing nano-alumina and UiO-66 nor using nano-alumina alone can achieve the technical effect of Example 1. The test results of Example 1 and Comparative Examples 3 and 4 show that allyl glycidyl ether and N-(3-dimethylaminopropyl)methacrylamide are indispensable in the preparation of modified silicone oil; otherwise, the final PVC conveyor belt surface material will have poor performance. The test results of Example 1 and Comparative Example 5 show that when the modified silicone oil is replaced with an equal mass of plasticizer, all properties except impact strength deteriorate. This indicates that the application of modified silicone oil in this invention is beneficial to improving the mechanical properties, oil resistance, wear resistance and heat oxidation resistance of the PVC conveyor belt surface material.
[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An oil resistant PVC conveyor belt coverstock material characterized in that, The components include the following weight parts: Polyvinyl chloride resin 100 parts; Stabilizer 5 parts; Plasticizer 25-30 parts; Modified alumina 10-20 parts; Modified silicone oil 3-5 parts; Antistatic agent 2-4 parts; Antioxidant 0.5-1 part; The modified alumina is alumina loaded with zirconium-based metal organic framework; The modified silicone oil is obtained by hydrosilylation reaction of hydrogen-containing silicone oil, allyl glycidyl ether and N-(3-dimethylaminopropyl) methacrylamide.
2. The oil resistant PVC conveyor belt cover material according to claim 1, characterized in that, The plasticizer is at least one of polyester plasticizer UN610, polyester plasticizer UN615, polyester plasticizer UN620 and polyester plasticizer UN630.
3. The oil resistant PVC conveyor belt cover material of claim 1, wherein, The preparation method of the modified alumina comprises the following steps: Dissolve terephthalic acid in N,N-dimethylformamide, after stirring for 20-30 min, add zirconium tetrachloride, continue to stir for 30 min, then add alumina, stir for 30 min, then add acetic acid, continue to stir for 1 h, then transfer to a reaction kettle, react at 120℃ for 24 h, after the reaction is completed, filter, wash the filter cake with methanol, and then dry to obtain the modified alumina.
4. The oil resistant PVC conveyor belt cover material of claim 3, wherein, The amount ratio of terephthalic acid, N,N-dimethylformamide, zirconium tetrachloride, alumina and acetic acid is 0.38 g: 45-65 mL: 0.53 g: 4.5-9.0 g: 6 mL.
5. The oil resistant PVC conveyor belt cover material of claim 3, wherein, The alumina is nano alumina.
6. The oil resistant PVC conveyor belt cover material of claim 1, wherein, The preparation method of the modified silicone oil comprises the following steps: Put hydrogen-containing silicone oil and chloroplatinic acid catalyst into a flask, connect a condenser tube, under nitrogen protection, heat to 80℃, drop allyl glycidyl ether toluene solution, after dropping is completed, heat to 120℃ and react for 4-6 h, then drop N-(3-dimethylaminopropyl) methacrylamide toluene solution, after dropping is completed, heat to 120℃ and react for 10-12 h, after the reaction is completed, remove toluene by reduced pressure distillation, stir the distillation product in n-hexane until uniform, centrifugalize, remove the precipitate, remove n-hexane by reduced pressure distillation, and obtain the modified silicone oil.
7. The oil resistant PVC conveyor belt cover material of claim 6, wherein, The molar ratio of Si-H groups in the hydrogen-containing silicone oil, allyl glycidyl ether and N-(3-dimethylaminopropyl) methacrylamide is 1-1.1: 0.5-0.7: 0.3-0.
5.
8. The oil resistant PVC conveyor belt cover material of claim 6, wherein, The active hydrogen mass fraction in the hydrogen-containing silicone oil is 0.5-1.6%, the amount of chloroplatinic acid catalyst is 3-6% of the mass of hydrogen-containing silicone oil, and the chloroplatinic acid catalyst is 1-5% chloroplatinic acid isopropyl alcohol solution.
9. The oil resistant PVC conveyor belt cover material of claim 1, wherein, The stabilizer is calcium-zinc stabilizer.
10. A light weight conveyor belt comprising a belt core and a cover compound, characterized in that, The cover rubber is made of the oil-resistant PVC conveyor belt surface layer material according to any one of claims 1-9.