Antistatic PVC conveying belt surface layer material and light conveying belt

Abstract

The invention discloses an antistatic PVC conveying belt surface layer material and a light conveying belt, and belongs to the technical field of conveying belts. The antistatic PVC conveyor belt surface layer material provided by the invention is prepared from the following raw materials in parts by weight: 100 parts of PVC paste resin, 6 to 8 parts of antistatic component, 2 to 6 parts of flame retardant, 30 to 40 parts of plasticizer, 2 to 4 parts of stabilizer and 1 to 5 parts of wear-resistant filler. The preparation method comprises the following steps: firstly, mixing PVC paste resin with a plasticizer, fully dispersing, cooling, adding an antistatic component, a flame retardant, a stabilizer and a wear-resistant filler, dispersing, and carrying out vacuum defoaming, so as to obtain antistatic PVC conveyor belt surface layer material paste; carrying out heat setting treatment on the polyester fabric for preparing the light conveying belt; and finally, blade-coating the surface of the shaped polyester fabric with the antistatic PVC conveyor belt surface layer material paste, and carrying out plasticizing treatment to obtain the antistatic PVC conveyor belt. According to the antistatic PVC conveyor belt surface layer material provided by the invention, through a unique molecular synergistic migration mechanism, the antistatic agent is directionally enriched towards the surface, and the antistatic performance of the conveyor belt is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of conveyor belt technology, specifically relating to an antistatic PVC conveyor belt surface material and a lightweight conveyor belt. Background Technology

[0002] PVC conveyor belts are widely used in many industries, such as electronics, food, coal mining, and mining, due to their advantages of light weight, long lifespan, good flame retardancy, and low friction. However, because PVC material itself has high insulation and low water absorption, static electricity generated by friction during transportation is difficult to dissipate. This not only affects the normal transportation of products but may also cause safety accidents in certain environments. For example, in flammable and explosive locations such as coal mines, the accumulation of static electricity may lead to serious consequences such as fires or gas explosions.

[0003] Currently, existing technologies typically improve the antistatic properties of PVC conveyor belts by adding conductive carbon black. However, this method has certain limitations: on the one hand, as the amount of conductive carbon black added increases, the mechanical properties of the PVC conveyor belt, such as tensile strength, impact strength, and elongation, decrease significantly, while the hardness increases, affecting the service life and performance of the conveyor belt; on the other hand, due to the addition of conductive carbon black, the color of the conveyor belt is usually limited to black or light black, restricting its application in some fields where color is important. Furthermore, the addition of solid materials such as conductive carbon black makes PVC paste preparation difficult, directly affecting the manufacturing process of the conveyor belt and the performance of the final product. Therefore, it is essential to develop a new antistatic PVC conveyor belt surface material. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an antistatic PVC conveyor belt surface material and a lightweight conveyor belt.

[0005] The first aspect of this invention is to provide an antistatic PVC conveyor belt surface material, which, by weight, comprises the following raw materials: 100 parts PVC paste resin and 6-8 parts antistatic components; The antistatic component is prepared by the following steps: S1: Quaternary ammonium salt antistatic agent and perfluorooctyl quaternary ammonium iodide are dispersed in a dispersant to form a dispersion; S2: Remove the dispersant from the dispersion to obtain the antistatic component.

[0006] It should be noted that this invention creatively prepares antistatic components using quaternary ammonium salt antistatic agents and perfluorooctyl quaternary ammonium iodide. The quaternary ammonium salt antistatic agent contains a quaternary ammonium group, which is well compatible with perfluorooctyl quaternary ammonium iodide. The two can form a relatively stable perfluorooctyl quaternary ammonium iodide@quaternary ammonium salt antistatic agent complex. As a fluorocarbon surfactant, perfluorooctyl quaternary ammonium iodide, with its inherent self-migration function, facilitates the migration and enrichment of the quaternary ammonium salt antistatic agent towards the coating surface after the perfluorooctyl quaternary ammonium iodide@quaternary ammonium salt antistatic agent complex is formed. This results in as many quaternary ammonium salt antistatic agents as possible being distributed closer to the outside environment, increasing the likelihood of the quaternary ammonium salt antistatic agent being exposed to air, thereby improving the antistatic properties.

[0007] In some embodiments, the mass ratio of quaternary ammonium salt antistatic agent to perfluorooctyl quaternary ammonium iodide is 7-9:3-5.

[0008] It should be noted that quaternary ammonium salt antistatic agents include, but are not limited to, stearamide ethyl-hydroxyethyl dimethyl ammonium nitrate, dimethyl ethyl octadecyl quaternary ammonium sulfate ethyl ester, diethyl benzyl ammonium chloride, dodecyl trimethyl ammonium chloride, and hexadecyl trimethyl ammonium bromide.

[0009] In some implementations, the dispersion stirring speed in S1 is 300-400 rpm.

[0010] In some embodiments, S2 specifically involves drying the dispersion at 60-80°C for 2-3 hours, and the resulting solid substance is the antistatic component.

[0011] It should be noted that quaternary ammonium salt antistatic agents have poor heat resistance and usually decompose at 150℃, so the drying temperature must be limited.

[0012] In some embodiments, the dispersant is selected from at least one of C1-4 alcohols and DMF.

[0013] In some embodiments, the antistatic PVC conveyor belt surface material, by weight, also includes 2-6 parts flame retardant, 30-40 parts plasticizer, 2-4 parts stabilizer, and 1-5 parts wear-resistant filler.

[0014] In some embodiments, the flame retardant is selected from at least one of triisopropylphenyl phosphate and trichloroethyl phosphate; the plasticizer is dioctyl phthalate; the stabilizer is calcium zinc stabilizer; and the wear-resistant filler is selected from at least one of polytetrafluoroethylene wax, silicon carbide, and molybdenum disulfide.

[0015] A second aspect of the present invention is to provide a lightweight conveyor belt comprising an antistatic PVC conveyor belt surface material.

[0016] In some embodiments, the lightweight conveyor belt is prepared by the following steps: (1) Mix PVC paste resin with plasticizer, disperse it fully and cool it, add antistatic components, flame retardant, stabilizer and wear-resistant filler, disperse it and degas it under vacuum to obtain antistatic PVC conveyor belt surface material paste. (2) The polyester fabric used to prepare the lightweight conveyor belt is subjected to heat setting treatment; (3) Apply the antistatic PVC conveyor belt surface material paste to the surface of the polyester fabric after the shaping in step (2), and then plasticize it to obtain a lightweight conveyor belt.

[0017] In some embodiments, the mixing temperature of PVC paste resin and plasticizer in step (1) is 40-50°C, and the cooling temperature is 20-30°C.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention creatively prepares an antistatic component, a perfluorooctyl quaternary ammonium iodide@quaternary ammonium salt antistatic agent complex, which can be enriched on the coating surface through self-migration function, increasing the possibility of quaternary ammonium salt antistatic agent exposure in air, improving ion dissociation, forming a continuous conductive structure, reducing the surface resistance of the coating, and greatly improving the antistatic properties of the coating.

[0019] The lightweight conveyor belt containing antistatic PVC conveyor belt surface material provided by this invention achieves the directional enrichment of antistatic agent on the surface through a unique molecular cooperative migration mechanism, which greatly improves the conductivity efficiency and further enhances the wear resistance and environmental corrosion resistance, and can be applied in flammable and explosive scenarios. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the embodiments.

[0021] Example 1 An antistatic PVC conveyor belt surface material, by weight, comprises the following raw materials: 100 parts PVC paste resin, 7 parts antistatic component, 4 parts flame retardant, 35 parts plasticizer, 3 parts stabilizer, and 3 parts wear-resistant filler.

[0022] The antistatic component is prepared by the following steps: S1: Dodecyltrimethylammonium chloride and perfluorooctyl quaternary ammonium iodide (CAS No.: 1652-63-7) were dispersed in methanol at a mass ratio of 8:4 and stirred at 350 rpm to form a dispersion. S2: Dry the dispersion at 70℃ for 2.5h to obtain the solid substance, which is the antistatic component.

[0023] A lightweight conveyor belt comprising the above-mentioned antistatic PVC conveyor belt surface material is prepared by the following steps: (1) Mix PVC paste resin with dioctyl phthalate at 45°C, disperse it fully, cool it to 25°C, add antistatic component triisopropylphenyl phosphate, calcium zinc stabilizer and polytetrafluoroethylene wax, disperse it and degas it under vacuum to obtain antistatic PVC conveyor belt surface material paste. (2) The polyester fabric used to prepare the lightweight conveyor belt is subjected to heat setting treatment; (3) Apply the antistatic PVC conveyor belt surface material paste to the surface of the polyester fabric after the shaping in step (2), and then plasticize it to obtain a lightweight conveyor belt.

[0024] Example 2 It is basically the same as Example 1, except that: The antistatic PVC conveyor belt surface material provided in this embodiment 2 contains the following raw materials by weight: 100 parts PVC paste resin, 8 parts antistatic component, 6 parts flame retardant, 40 parts plasticizer, 4 parts stabilizer, and 5 parts wear-resistant filler.

[0025] Example 3 It is basically the same as Example 1, except that: The antistatic PVC conveyor belt surface material provided in this embodiment 3 contains the following raw materials by weight: 100 parts PVC paste resin, 6 parts antistatic component, 2 parts flame retardant, 30 parts plasticizer, 2 parts stabilizer, and 1 part wear-resistant filler.

[0026] Example 4 It is basically the same as Example 1, except that the mass ratio of stearamide ethyl-hydroxyethyl dimethyl ammonium nitrate to perfluorooctyl quaternary ammonium iodide is 7:3.

[0027] Example 5 It is basically the same as Example 1, except that the mass ratio of dimethyl ethyl octadecyl quaternary ammonium sulfate ethyl ester salt to perfluorooctyl quaternary ammonium iodide is 9:5.

[0028] Comparative Example 1 It is basically the same as Example 1, except that the perfluorooctyl quaternary ammonium iodide is replaced with the same amount of fluorosilane.

[0029] Comparative Example 2 It is basically the same as Example 1, except that perfluorooctyl quaternary ammonium iodide is replaced with the same amount of dodecyltrimethylammonium bromide.

[0030] To demonstrate the excellent antistatic properties of the PVC conveyor belt surface material provided by this invention, performance tests were conducted on the lightweight conveyor belts prepared in Examples 1-5 and Comparative Examples 1-2. The test results are shown in Table 1.

[0031] Antistatic performance test method: The conveyor belts obtained in Examples 1-5 and Comparative Examples 1-2 were used as test samples, with a specification of 300mm*300mm. The surface resistance of the samples was measured under the conditions of 25℃ and 65% relative humidity.

[0032] Mechanical property testing methods: Tensile strength is tested according to GB / T 3690 standard; abrasion resistance is tested according to GB / T 9867 standard.

[0033] Table 1 As can be seen from the test results in Table 1, the present invention can effectively improve the antistatic properties of the conveyor belt by forming a perfluorooctyl quaternary ammonium iodide@quaternary ammonium salt antistatic agent complex, thereby enhancing the mechanical properties of the conveyor belt.

[0034] In Comparative Example 1, fluorosilane was used to replace perfluorooctyl quaternary ammonium iodide. Although fluorosilane contains fluorine and has self-migratory properties, it does not contain quaternary ammonium groups and has poor compatibility with quaternary ammonium salt antistatic agents, resulting in a poor final antistatic composition. In Comparative Example 2, dodecyltrimethylammonium bromide was added to replace perfluorooctyl quaternary ammonium iodide. Since dodecyltrimethylammonium bromide does not contain fluorine and does not have self-migratory properties, the antistatic component is less effective, which greatly reduces the antistatic properties of the lightweight conveyor belt and also reduces its mechanical properties.

[0035] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. An antistatic PVC conveyor belt surface material, characterized in that, By weight, it contains the following raw materials: 100 parts PVC paste resin, 6-8 parts antistatic component; The antistatic component is prepared by the following steps: S1: Quaternary ammonium salt antistatic agent and perfluorooctyl quaternary ammonium iodide are dispersed in a dispersant to form a dispersion; S2: Remove the dispersant from the dispersion to obtain the antistatic component.

2. The antistatic PVC conveyor belt surface material according to claim 1, characterized in that, The mass ratio of the quaternary ammonium salt antistatic agent to the perfluorooctyl quaternary ammonium iodide is 7-9:3-5.

3. The antistatic PVC conveyor belt surface material according to claim 1, characterized in that, In S1, the dispersion and stirring speed is 300-400 rpm.

4. The antistatic PVC conveyor belt surface material according to claim 1, characterized in that, S2 specifically involves drying the dispersion at 60-80°C for 2-3 hours, and the resulting solid substance is the antistatic component.

5. The antistatic PVC conveyor belt surface material according to claim 1, characterized in that, The dispersant is selected from C. 1-4 At least one of alcohols and DMF.

6. The antistatic PVC conveyor belt surface material according to any one of claims 1-5, characterized in that, The antistatic PVC conveyor belt surface material, by weight, also includes 2-6 parts flame retardant, 30-40 parts plasticizer, 2-4 parts stabilizer, and 1-5 parts wear-resistant filler.

7. The antistatic PVC conveyor belt surface material according to claim 6, characterized in that, The flame retardant is selected from at least one of triisopropylphenyl phosphate and trichloroethyl phosphate; the plasticizer is dioctyl phthalate; the stabilizer is calcium zinc stabilizer; and the wear-resistant filler is selected from at least one of polytetrafluoroethylene wax, silicon carbide, and molybdenum disulfide.

8. A lightweight conveyor belt, characterized in that, It includes the antistatic PVC conveyor belt surface material as described in claim 7.

9. The lightweight conveyor belt according to claim 8, characterized in that, It is prepared by the following steps: (1) Mix the PVC paste resin with the plasticizer, disperse it fully and cool it, add the antistatic component, the flame retardant, the stabilizer and the wear-resistant filler, disperse it and degas it under vacuum to obtain the antistatic PVC conveyor belt surface material paste. (2) The polyester fabric used to prepare the lightweight conveyor belt is subjected to heat setting treatment; (3) The antistatic PVC conveyor belt surface material is applied to the surface of the polyester fabric after the shaping in step (2), and the lightweight conveyor belt is obtained by plasticizing.

10. The lightweight conveyor belt according to claim 9, characterized in that, In step (1), the mixing temperature of PVC paste resin and plasticizer is 40-50℃, and the cooling temperature is 20-30℃.

Images