PVC conductive film and calendering preparation method thereof
By adding conductive carbon black and other auxiliary materials to the PVC film, optimizing the proportion and preparation process, the shortcomings of the existing conductive films in terms of conductivity and processing performance are solved, and a PVC conductive film with high conductivity and good processing performance are achieved. .
Patent Information
- Application Number
- CN202411504818.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-27
- Publication Date
- 2025-02-14
AI Technical Summary
The existing conductive films have shortcomings in their conductivity and processing properties, and are difficult to meet the needs of large-scale applications.
By adding conductive carbon black and other auxiliary materials to the PVC film, the ratio and preparation process are optimized, the dispersion and conductivity of conductive carbon black are improved and the resistance value is reduced.
It achieves a conductive plastic film with a higher conductivity at a lower conductive carbon black content, improves processing performance and mechanical properties, and is suitable for technical requirements such as modern electronic packaging.
Smart Images
Figure CN119431968A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to plastic processing technology, in particular to a PVC conductive film and a calendering preparation method thereof. Background Art
[0002] In the field of plastic processing, the research and application of conductive plastics are increasingly gaining attention. Conductive plastics have good electrical conductivity and are widely used in electromagnetic shielding, antistatic and other fields. Currently, most of the conductive films on the market are made of metal materials or metal oxide materials. Although these materials have excellent electrical conductivity, they have problems such as weight, cost and environmental pollution. Therefore, it is an urgent need to study a conductive film that is lightweight, environmentally friendly, has a large output and is low in cost. However, traditional conductive plastics have poor processing performance and are difficult to form films, which limits their application. Therefore, it is imperative to seek a conductive plastic with excellent electrical conductivity and processing performance. The present invention relates to the field of conductive plastic technology, and in particular to a PVC conductive plastic film, a preparation method and a processing and manufacturing method.
[0003] Calendered PVC conductive film has good conductivity and is an important conductive material. It has stable conductivity and mechanical properties, as well as large production capacity, low cost, lightness, and softness, which provides the possibility for large-scale application of conductive materials. It has superior performance in many occasions. PVC conductive film has broad application prospects in electromagnetic shielding, wireless charging, sensors, new energy vehicles and other fields.
[0004] Conductive carbon black is actually a kind of carbon nanotube. Carbon nanotube is a one-dimensional nanomaterial, a tubular structure formed by carbon atoms arranged in a specific way. The conductivity of carbon nanotube mainly depends on the chemical bonds and conjugation between carbon atoms. The σ bond and π bond between carbon atoms are the main reasons for the conductivity of carbon nanotube. Specifically, the σ bond is formed by the covalent bond between carbon atoms and can provide a certain electronic conductivity. The π bond is formed by the p orbitals arranged in the same plane, which has a high degree of electron sharing and can form a π electron cloud area, further enhancing the conductivity of carbon nanotube. Carbon nanotube is the best known plastic conductive filler. Summary of the invention
[0005] The purpose of the present invention is to overcome the insufficient conductivity of existing products and provide a low-resistance PVC film and a method for manufacturing the same.
[0006] The present invention is achieved through the following technical solutions: A PVC conductive film, comprising, by weight: 100 parts of polymer matrix; Conductive carbon black 15-25 parts; 45-55 parts of plasticizer; 4-5 parts of stabilizer; 1 to 2 parts of other additives.
[0007] Preferably, the polymer matrix fat is one or more PVC resins with different polymerization degrees.
[0008] Preferably, the degree of polymerization of the PVC resin is in the range of 800-1000.
[0009] Preferably, the plasticizer is one or more of DOTP, TOTM, TCPP, and epoxidized soybean oil.
[0010] Preferably, the stabilizer is one or more of a tin-containing stabilizer, a calcium-zinc composite stabilizer, and a barium-zinc composite stabilizer.
[0011] Preferably, the stabilizer is a calcium-zinc composite stabilizer or a barium-zinc composite stabilizer.
[0012] Preferably, the conductive carbon black is selected from single-layer carbon nanotubes.
[0013] Preferably, the other auxiliary agent is selected from at least one of methacrylates or chlorinated polyethylene.
[0014] Preferably, the other auxiliary agent is selected from methacrylates.
[0015] The present invention also provides a method for preparing the PVC conductive film, which is characterized by comprising the following steps: Step 1: Weigh the conductive carbon black according to weight for mixing and pre-dispersion; Step 2: Preparation of conductive material mixture: Weigh 1-2 parts of polymer matrix, plasticizer, stabilizer and other additives by weight and mix them evenly with a high-speed machine; Step 3: Mix the mixtures prepared in step 1 and step 2 together in a mixer; Step 4: The uniformly mixed mixture is passed through an internal mixer, an open mixer or the like to form a conductive mixture into a plasticized conductive sol; Step 5: The conductive sol is extruded at 190 degrees by an extruder and fed to a calender for calendering. The film is embossed, cooled, and cut into films of required specifications.
[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention improves the dispersibility of conductive carbon black in the resin matrix and reduces the occurrence of carbon black agglomeration by selecting suitable polymer materials and auxiliary materials. The basic structure of carbon nanotubes is not significantly damaged, and a good initial conductivity is maintained. A conductive plastic film with a higher conductivity can be obtained at a lower conductive carbon black content. In the above preparation process, the basic mechanical properties and processing properties of the material are slightly affected, and the technical requirements of modern electronic packaging can be well met. The resistance value test result of the PVC conductive film (thickness 0.3-0.4mm) prepared by the present invention is: ≤100 ohms.
[0017] The PVC conductive film preparation method provided by the present invention can produce a conductive film with good conductive properties and mechanical properties through a specific ratio and a suitable production process. At the same time, the raw materials used in the present invention have good compatibility, so that the processing performance of the conductive film is significantly improved, and the film is easy to form, and the PVC conductive film with stable performance and controllable resistance value can be smoothly and in large quantities. Therefore, the present invention has broad application prospects and market potential. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings: Figure 1 A PVC conductive film prepared by the present invention; Figure 2 This is the measurement of resistance in the present invention. DETAILED DESCRIPTION
[0019] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.
[0020] Example 1, a PVC conductive film, comprising, by weight, 100 parts of PVC (800), 3 parts of epoxidized soybean oil, 2 parts of Ba / Zn composite stabilizer, 2 parts of Ca / Zn composite stabilizer, 55 parts of plasticizer TOTM, 18 parts of single-layer nanocarbon tubes, and 2 parts of methacrylate.
[0021] The preparation method of the PVC conductive film comprises the following steps: Step 1: Weigh 18 parts of single-walled carbon nanotubes and 18 parts of plasticizer by weight for mixing and pre-dispersion; Step 2: Preparation of conductive material mixture: 100 parts of PVC powder resin with a polymerization degree of 800, 37 parts of plasticizer, 4 parts of stabilizer, 3 parts of epoxy soybean oil, and 2 parts of methacrylate were weighed by weight and mixed evenly by high-speed machine (140 seconds); Step 3: Mix the mixtures prepared in step 1 and step 2 together in a mixer (rpm 500, 40 seconds); Step 4: The uniformly mixed mixture is passed through an internal mixer (215 seconds) and an open mixer (165 degrees) to make the conductive mixture into a plasticized conductive sol.
[0022] Step 5: The conductive sol is extruded at 190 degrees by an extruder and fed to a calender for calendering. The film is embossed, cooled, and cut into films of required specifications.
[0023] Example 2, a PVC conductive film, comprising, by weight, 100 parts of PVC (1000), 3 parts of epoxidized soybean oil, 2 parts of Ba / Zn composite stabilizer, 2 parts of Ca / Zn composite stabilizer, 55 parts of plasticizer TOTM, 18 parts of single-layer nanocarbon tubes, and 2 parts of methacrylate.
[0024] The preparation method of the PVC conductive film comprises the following steps: Step 1: Weigh 18 parts of single-walled carbon nanotubes and 18 parts of plasticizer by weight for mixing and pre-dispersion; Step 2: Preparation of conductive material mixture: 100 parts of PVC powder resin with a degree of polymerization of 1000, 37 parts of plasticizer, 4 parts of stabilizer, 3 parts of epoxy soybean oil, and 2 parts of methacrylate were weighed by weight and mixed evenly by high-speed machine (140 seconds); Step 3: Mix the mixtures prepared in step 1 and step 2 together in a mixer (rpm 500, 40 seconds); Step 4: The uniformly mixed mixture is passed through an internal mixer (215 seconds) and an open mixer (165 degrees) to make the conductive mixture into a plasticized conductive sol.
[0025] Step 5: The conductive sol is extruded at 190 degrees by an extruder and fed to a calender for calendering. The film is embossed, cooled, and cut into films of required specifications.
[0026] Example 3, a PVC conductive film, comprising, by weight, 50 parts of PVC (700), 50 parts of PVC (800), 3 parts of epoxidized soybean oil, 2 parts of Ba / Zn composite stabilizer, 2 parts of Ca / Zn composite stabilizer, 55 parts of plasticizer TOTM, 18 parts of single-layer nanocarbon tubes, and 2 parts of methacrylate.
[0027] The preparation method of the PVC conductive film comprises the following steps: Step 1: Weigh 18 parts of single-walled carbon nanotubes and 18 parts of plasticizer by weight for mixing and pre-dispersion; Step 2: Preparation of conductive material mixture: Weigh 50 parts of PVC powder resin with a polymerization degree of 700, 50 parts of PVC powder resin with a polymerization degree of 7800, 37 parts of plasticizer, 4 parts of stabilizer, 3 parts of epoxy soybean oil, and 2 parts of methacrylate by weight and mix them evenly with a high-speed machine (140 seconds); Step 3: Mix the mixtures prepared in step 1 and step 2 together in a mixer (rpm 500, 40 seconds); Step 4: The uniformly mixed mixture is passed through an internal mixer (215 seconds) and an open mixer (165 degrees) to make the conductive mixture into a plasticized conductive sol.
[0028] Step 5: The conductive sol is extruded at 190 degrees by an extruder and fed to a calender for calendering. The film is embossed, cooled, and cut into films of required specifications.
[0029] Comparative Example 1, a PVC conductive film, comprising, by weight, 100 parts of PVC (1000), 3 parts of epoxidized soybean oil, 2 parts of Ba / Zn composite stabilizer, 2 parts of Ca / Zn composite stabilizer, 55 parts of plasticizer TOTM, 18 parts of single-layer nanocarbon tubes, and 2 parts of methacrylate.
[0030] The preparation method of the PVC conductive film comprises the following steps: Step 1: Weigh 18 parts of single-walled carbon nanotubes and 18 parts of plasticizer by weight for mixing and pre-dispersion; Step 2: Preparation of conductive material mixture: 100 parts of PVC powder resin with a degree of polymerization of 1000, 37 parts of plasticizer, 4 parts of stabilizer, 3 parts of epoxy soybean oil, and 2 parts of methacrylate were weighed by weight and mixed evenly by high-speed machine (140 seconds); Step 3: Mix the mixtures prepared in step 1 and step 2 together in a mixer (rpm 500, 40 seconds); Step 4: The uniformly mixed mixture is passed through an internal mixer (215 seconds) and an open mixer (165 degrees) to make the conductive mixture into a plasticized conductive sol.
[0031] Step 5: The conductive sol is extruded at 190 degrees by an extruder and fed to a calender for calendering. The film is embossed, cooled, and cut into films of required specifications.
[0032] Comparative Example 2, a PVC conductive film, includes, by weight, 100 parts of PVC (1300), 3 parts of epoxidized soybean oil, 2 parts of Ba / Zn composite stabilizer, 2 parts of Ca / Zn composite stabilizer, 55 parts of plasticizer TOTM, 18 parts of single-layer nanocarbon tubes, and 2 parts of methacrylate.
[0033] The preparation method of the PVC conductive film comprises the following steps: Step 1: Weigh 18 parts of single-walled carbon nanotubes and 18 parts of plasticizer by weight for mixing and pre-dispersion; Step 2: Preparation of conductive material mixture: 100 parts of PVC powder resin with a degree of polymerization of 1300, 37 parts of plasticizer, 4 parts of stabilizer, 3 parts of epoxy soybean oil, and 2 parts of methacrylate were weighed by weight and mixed evenly by high-speed machine (140 seconds); Step 3: Mix the mixtures prepared in step 1 and step 2 together in a mixer (rpm 500, 40 seconds); Step 4: The uniformly mixed mixture is passed through an internal mixer (215 seconds) and an open mixer (165 degrees) to make the conductive mixture into a plasticized conductive sol.
[0034] Step 5: The conductive sol is extruded at 190 degrees by an extruder and fed to a calender for calendering. The film is embossed, cooled, and cut into films of required specifications.
[0035] Due to poor material fluidity, step 5 could not be achieved during actual production.
[0036] Test Example 1 The resistance value test uses an M-3 portable digital four-probe resistance detector.
[0037] The test methods for breaking strength and breaking elongation are: Film-forming property refers to: Processability refers to:
[0038] The processing properties and resistance values of the high molecular PVC conductive plastic films prepared according to Comparative Examples 1-2 and Examples 1-3 are shown in Table 1. As can be seen from Table 1, although the resistance value of the conductive film prepared in the laboratory of Comparative Examples 1-2 is not much different from that of Example 1, it is too difficult to produce in large quantities, and the resistance value is extremely unstable and has no practical value. It can be seen that when the same formula and preparation method are used, using PVC powder with a polymerization degree of 700-800, a conductive PVC film with stable conductive properties, good processing properties and balanced physical properties can be successfully produced.
Claims
1. A PVC conductive film, characterized in that: In parts by weight: 100 parts of polymer matrix; Conductive carbon black 15-25 parts; 45-55 parts of plasticizer; 4-5 parts of stabilizer; 1 to 2 parts of other additives.
2. The PVC conductive film according to claim 1, characterized in that: The polymer matrix fat is one or more PVC resins with different polymerization degrees.
3. The PVC conductive film according to claim 2, characterized in that: The degree of polymerization of the PVC resin ranges from 800 to 1000.
4. The PVC conductive film according to claim 1, characterized in that: The plasticizer is one or more of DOTP, TOTM, TCPP and epoxidized soybean oil.
5. The PVC conductive film according to claim 1, characterized in that: The stabilizer is one or more of a tin-containing stabilizer, a calcium-zinc composite stabilizer, and a barium-zinc composite stabilizer.
6. The PVC conductive film according to claim 5, characterized in that: The stabilizer is a calcium-zinc composite stabilizer and a barium-zinc composite stabilizer.
7. The PVC conductive film according to claim 1, characterized in that: The conductive carbon black is selected from single-layer carbon nanotubes.
8. The PVC conductive film according to claim 1, characterized in that: The other auxiliary agent is selected from at least one of methacrylates or CPE.
9. The PVC conductive film according to claim 7, characterized in that: The other auxiliary agents are selected from methacrylates.
10. The calendering preparation method of PVC conductive film according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Weigh the conductive carbon black according to weight for mixing and pre-dispersion; Step 2: Preparation of conductive material mixture: Weigh 1-2 parts of polymer matrix, plasticizer, stabilizer and other additives by weight and mix them evenly with a high-speed machine; Step 3: Mix the mixtures prepared in step 1 and step 2 together in a mixer; Step 4: The uniformly mixed mixture is passed through an internal mixer, an open mixer or the like to form a conductive mixture into a plasticized conductive sol; Step 5: The conductive sol is extruded at 190 degrees by an extruder and fed to a calender for calendering. The film is embossed, cooled, and cut into films of required specifications.