Carbon black, sealant containing same and application thereof
By using characteristic modification of carbon black, the problem that the insulation of the sealant is limited by the resin is solved, and the preparation of high-insulating sealant is achieved, which improves its application performance.
Patent Information
- Application Number
- CN202311143167.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-08-29
- Filing Date
- 2023-09-05
- Publication Date
- 2025-02-28
AI Technical Summary
The insulation of existing sealant is limited by the resin itself, which is difficult to further improve, limiting its application.
It is provided that a carbon black has a nitrogen adsorption specific surface area and oil absorption value within a specific range, and the particle size and aggregate particle size meet specific conditions, for the preparation of high insulating sealants.
By using modified carbon black, the insulation of the sealant is significantly improved and its application performance in electronic products is improved.
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Abstract
Description
Technical Field
[0001] The invention relates to carbon black, in particular to high-insulation modified carbon black. Background Art
[0002] Today's electronic products are developing towards being lighter, thinner, shorter and smaller. As the size of electronic products continues to decrease, the distance between components becomes closer, making the insulation of the sealant used to protect the components more important.
[0003] Known sealants are mainly composed of resin and curing agent, and carbon black can be further added as needed to give the sealant color and further improve the mechanical properties of the sealant. In the known technology, the research on the insulation properties of sealants focuses on the resin used therein, but does not study other components, so that the insulation of the sealant is limited to the insulation of the resin itself, and it is difficult to make further breakthroughs, which in turn limits the application of the sealant. Summary of the invention
[0004] In view of the above problems, an object of the present invention is to provide a sealant with high insulation properties.
[0005] In order to achieve the above object, the present invention provides a carbon black which satisfies the following conditions (a) and (b): (a) a nitrogen adsorption specific surface area (NSA) of greater than 0 m 2 / g, and 130m 2 / g or less; and (b) an oil absorption number (OAN) of greater than 0cc / 100g and less than 95cc / 100g.
[0006] Furthermore, the nitrogen adsorption specific surface area is greater than 0m 2 / g, and 65m 2 / g or less. Furthermore, the nitrogen adsorption specific surface area is greater than 0m 2 / g, and 36m 2 / g or less. Furthermore, the nitrogen adsorption specific surface area is greater than 0m 2 / g, and 32m 2 / g or less.
[0007] Furthermore, the oil absorption value is greater than 0cc / 100g and is not more than 92cc / 100g. Furthermore, the oil absorption value is greater than 0cc / 100g and is not more than 80cc / 100g.
[0008] Furthermore, the carbon black satisfies the following condition (c): (c) the primary particle size is 45 to 70 nanometers. Furthermore, the primary particle size is 50 to 70 nanometers.
[0009] Further, the carbon black satisfies the following condition (d): (d) the particle size of the aggregate is 120 to 550 nanometers. Further, the particle size of the aggregate is 120 to 400 nanometers.
[0010] Furthermore, the carbon black satisfies the following condition (e): (e) the volatile matter content is 1 wt % to 5 wt %.
[0011] Furthermore, the carbon black satisfies the following condition (f): (f) the resistivity is 0.020Ω*cm or more.
[0012] The present invention further provides a sealant comprising: a resin; a hardener; and the aforementioned carbon black.
[0013] Furthermore, the sealant contains a defoaming agent.
[0014] Furthermore, the sealant is electronic potting glue.
[0015] The present invention further provides a use of the carbon black, which is used in sealant.
[0016] Furthermore, the sealant is electronic potting glue.
[0017] The inventors of this case unexpectedly discovered that when carbon black meets certain conditions, not only can the insulation of the carbon black powder itself be improved, but applying it to sealants can also make the sealants have high insulation properties. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1A , Figure 1B , Figure 1C and Figure 1D This is a transmission electron microscope (TEM) photograph of the carbon black of Production Example 1.
[0019] Figure 2A , Figure 2B and Figure 2C This is a transmission electron microscope (TEM) photograph of the carbon black of Production Example 2.
[0020] Figure 3A , Figure 3B and Figure 3C This is a transmission electron microscope (TEM) photograph of the carbon black of Comparative Example 1.
[0021] Figure 4A , Figure 4B and Figure 4C This is a transmission electron microscope (TEM) photograph of the carbon black of Production Example 1.
[0022] Figure 5A , Figure 5B , Figure 5C , Figure 5D , Figure 5E and Fig. 5F This is a transmission electron microscope (TEM) photograph of the carbon black of Production Example 2.
[0023] Fig. 6A and Figure 6B This is a transmission electron microscope (TEM) photograph of the carbon black of Comparative Example 1. DETAILED DESCRIPTION
[0024] In the present invention, “between X and Y” is equivalent to “X to Y”, including the end values X and Y.
[0025] The carbon black provided by the present invention satisfies the following conditions (a) and (b).
[0026] Condition (a): Nitrogen adsorption specific surface area (NSA) is greater than 0 m 2 / g, and 130m 2 In certain embodiments, the nitrogen adsorption specific surface area is greater than 0 m 2 / g, and 65m 2 In certain embodiments, the nitrogen adsorption specific surface area is greater than 0 m 2 / g, and 40m 2 In certain embodiments, the nitrogen adsorption specific surface area is greater than 0 m 2 / g, and 36m 2 In certain embodiments, the nitrogen adsorption specific surface area is greater than 0 m 2 / g, and 32m 2 In certain embodiments, the nitrogen adsorption specific surface area is between any two of the following values: 5, 10, 15, 20, 25 and 30 m 2 / g.
[0027] Condition (b): The oil absorption value (OAN) is greater than 0cc / 100g and is less than 95cc / 100g. In certain embodiments, the oil absorption value is greater than 0cc / 100g and is less than 92cc / 100g. In certain embodiments, the oil absorption value is greater than 0cc / 100g and is less than 80cc / 100g. In certain embodiments, the oil absorption value is between any two of the following values: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70 and 77cc / 100g.
[0028] The carbon black may further satisfy the following condition (c).
[0029] Condition (c): The primary particle size is 45 to 70 nanometers. In certain embodiments, the primary particle size is 50 to 70 nanometers.
[0030] The carbon black may further satisfy the following condition (d).
[0031] Condition (d): The particle size of the aggregate is 120 to 550 nanometers. In certain embodiments, the particle size of the aggregate is 120 to 400 nanometers.
[0032] In certain embodiments, the carbon black satisfies the following conditions: NSA is 32 to 40 m 2 / g; OAN is 85-95cc / 100g; the primary particle size is 45-65nm; and the particle size of the aggregate is 200-550nm.
[0033] In certain embodiments, the carbon black satisfies the following conditions: NSA is 20 to 32 m 2 / g; OAN is 70-85cc / 100g; the primary particle size is 50-70nm; and the particle size of the aggregate is 120-400nm.
[0034] The carbon black may further satisfy the following condition (e).
[0035] Condition (e): The volatile content is 1 wt% to 5 wt%. In certain embodiments, the volatile content is between any two of the following values: 1.2 wt%, 1.4 wt%, 1.6 wt%, 1.8 wt%, 2 wt%, 2.2 wt%, 2.4 wt%, 2.6 wt%, 2.8 wt%, 3.5 wt%, 4.0 wt% and 4.5 wt%. In certain embodiments, the volatile content is 1.3 wt% to 3 wt%.
[0036] The carbon black may further satisfy the following condition (f).
[0037] Condition (f): The resistivity is greater than 0.020 Ω*cm, for example, 0.020 to 0.060 Ω*cm. In some embodiments, the resistivity is greater than 0.022 Ω*cm. In some embodiments, the resistivity is greater than 0.024 Ω*cm.
[0038] The present invention further provides a sealant, which comprises: a resin; a hardener; and the aforementioned carbon black. The resin may be well known to those with ordinary knowledge in the technical field to which the invention belongs, including but not limited to: epoxy resin (e.g., bisphenol A epoxy resin, bisphenol F epoxy resin), polyurethane, and silicone. Examples of the hardener are well known to those with ordinary knowledge in the technical field to which the invention belongs, and will not be described in detail here.
[0039] The sealant may further include a defoamer. The defoamer includes, but is not limited to, BYK 1760, BYK A530, and BASF SI 2008. The defoamer may be used alone or in combination.
[0040] The present invention also provides a use of the carbon black, which is used for sealant.
[0041] In some embodiments, the sealant is an electronic potting compound.
[0042] Production Example: Production of Carbon Black
[0043] The carbon blacks of Examples 1 and 2 were obtained by modifying N774 carbon black and N660 carbon black respectively using the carbon material post-modification treatment system disclosed in Taiwan Patent No. 1796678B, and the manufacturing conditions are shown in Table 1. The contents of Taiwan Patent No. 1796678B are incorporated herein by reference in their entirety.
[0044] Table 1
[0045]
[0046] Table 2 shows the nitrogen adsorption specific surface area (NSA), carbon black oil absorption value (OAN), resistivity and volatile content of the carbon black powders of Preparation Example 1, Preparation Example 2 and Comparative Example 1. Comparative Example 1 in Table 2 is a commercially available carbon black. The measurement items listed in Table 2 were performed in the following manner:
[0047] [NSA]
[0048] The specific surface area of carbon black is measured according to ASTM D6556. The gas pressure of carbon black adsorbed and desorbed on the surface and pore size at a constant temperature is measured, and the total surface area of the external surface area and the internal surface area is measured according to the BET theoretical formula using the nitrogen surface area. The specific surface area is calculated using the gas molecular cross-sectional area, gas molecular volume, and sample weight.
[0049]
[0050] P is pressure, P0 is saturation pressure, V a Total absorption volume, C is the BET constant, V m The volume of gas required to form a monolayer.
[0051] [OAN]
[0052] Measure carbon black OAN according to ASTM D2414. Weigh a certain amount of carbon black with a density of 1.042 to 1.047 g / cm 3 Titrate white mineral oil to the endpoint, calculate the absorption value based on the weight of the carbon black sample and the titration amount, and substitute it into the following formula to obtain the OAN value.
[0053]
[0054] D: White mineral oil (petroleum) absorption value of carbon smoke
[0055] V: Volume of white mineral oil (petroleum) consumed
[0056] M: Sample weight
[0057] [Resistivity]
[0058] Use PRCD2100 (manufactured by IEST) powder impedance measuring instrument, weigh a certain amount of carbon black, continuously apply 10-200 MPa pressure, maintain the pressure for 10 seconds, and measure the powder impedance.
[0059] [Volatile matter]
[0060] Measure the organic compounds emitted by carbon black baked at 950℃ for 7 minutes, including residual oil, adhesives, and surface functional groups. Measure the weight of the crucible before and after the carbon black is burned, and calculate the loss percentage.
[0061] Table 2
[0062] Production Example 1 Production Example 2 Comparative Example 1 <![CDATA[NSA(m 2 / g)]]> 30 35 35 OAN(cc / 100g) 75 91 100 Resistivity(Ω*cm) 0.025 0.023 0.015 Volatile matter (%) 1.60 1.60 1.60
[0063] From the results in Table 2, it can be seen that the carbon blacks of Production Examples 1 and 2 have NSA set at 130 m 2 / g or less, and OAN is set below 95cc / 100g, excellent resistivity can be obtained, and if better resistivity is to be obtained, NSA and OAN can be further reduced.
[0064] Figure 1A , Figure 1B , Figure 1C and Figure 1D These are transmission electron microscope (TEM) photos taken at different locations of the carbon black in Manufacturing Example 1. Figure 1A , Figure 1B , Figure 1C and Figure 1D As shown, the primary particle sizes of the carbon black in Production Example 1 are 65, 68, 58, 59 and 61 nm, ranging from 50 to 70 nm.
[0065] Figure 2A , Figure 2B and Figure 2C These are transmission electron microscope (TEM) photos taken at different locations of the carbon black in Manufacturing Example 2. Figure 2A , Figure 2B and Figure 2C As shown, the primary particle sizes of the carbon black in Production Example 2 are 56.9, 50.8, 56.3, 49.0, 50.6, 60.6, 48.8, 63.1, 61.3 and 55.2 nm, ranging from 45 to 65 nm.
[0066] Figure 3A, Figure 3B and Figure 3C : These are transmission electron microscope (TEM) photos taken at different positions of the carbon black in Comparative Example 1. Figure 3A , Figure 3B and Figure 3C As shown, the primary particle sizes of the carbon black of Comparative Example 1 are 55, 42 and 54 nm.
[0067] Figure 4A , Figure 4B and Figure 4C These are transmission electron microscope (TEM) photos taken at different locations of the carbon black in Manufacturing Example 1. Figure 4A , Figure 4B and Figure 4C As shown, the particle sizes of the aggregates of the carbon black of Production Example 1 are 248, 264, and 196.7 nm, ranging from 120 to 400 nm.
[0068] Figure 5A , Figure 5B , Figure 5C , Figure 5D , Figure 5E and Fig. 5F These are transmission electron microscope (TEM) photos taken at different locations of the carbon black in Manufacturing Example 2. Figure 5A , Figure 5B , Figure 5C , Figure 5D , Figure 5E and Fig. 5F As shown, the particle sizes of the aggregates of carbon black in Production Example 2 are 251.3, 504.8, 244.3, 434.5, 443.5, and 525.4 nm, ranging from 200 to 550 nm.
[0069] Fig. 6A and Figure 6B : These are transmission electron microscope (TEM) photos taken at different positions of the carbon black in Comparative Example 1. Fig. 6A and Figure 6B As shown, the particle size of the carbon black aggregates in Comparative Example 1 is 333 and 371 nm, which is between 300 and 550 nm.
[0070] Example: Manufacturing of electronic potting glue
[0071] The carbon blacks of Manufacturing Example 1, Manufacturing Example 2 and Comparative Example 1 were mixed according to the components and proportions listed in Table 3 to prepare electronic potting adhesives of Example 1, Example 2 and Comparative Example 2, respectively.
[0072] Table 3
[0073] Element Weight(g) Epoxy resin (Nan Ya's NPEL-128E) 20 Hardener (Huntsman JEFFAMINE D-230) 6.6 Carbon Black 0.83 Defoamer (BASF SI2008) 0.13 Total weight 27.56 Carbon black content (%) 3.0 (i.e. 0.83 / 27.56*100%)
[0074] The electronic potting glue of Example 1, Example 2 and Comparative Example 2 was poured into a mold and placed in an oven at 80°C for heating for 1 hour to obtain a sample sheet to be tested. After cooling, the film thickness was measured with a film thickness meter (Covina C2401A01), and the volume resistance was measured with a high insulation resistance meter (HIOKI SM7120), and the volume resistivity was calculated using the following formula. The results are shown in Table 4. Volume resistivity (Ω*cm) = resistance value (measured value, unit is Ω) × 19.6 ÷ film thickness (cm)
[0075] Table 4
[0076] Example 1 Example 2 Comparative Example 2 Carbon black content (%) 3 3 3 Film thickness(mm) 1.44 1.75 1.58 Volume resistivity (Ω*cm) 5.09E+17 2.08E+17 7.74E+16
[0077] As shown in Table 4, the hardened film formed by the electronic potting adhesive of the present invention has excellent volume resistivity, that is, the hardened film has excellent insulation properties.
[0078] In summary, the present invention limits carbon black to specific conditions, so as to obtain high-insulation carbon black, and applies the carbon black to sealant, which can also make the sealant have high insulation properties.
[0079] The above are merely preferred embodiments of the present invention, and should not be used to limit the scope of implementation of the present invention. That is, simple equivalent changes and modifications made in accordance with the scope of the patent application and the content of the invention description of the present invention are still within the scope of the patent of the present invention.
Claims
1. A carbon black which satisfies the following conditions (a) and (b): (a) Nitrogen adsorption specific surface area (NSA) is greater than 0 m 2 / g, and 130m 2 / g or less; and (b) The oil absorption number (OAN) is greater than 0 cc / 100 g and is not more than 95 cc / 100 g.
2. The carbon black as claimed in claim 1, wherein the nitrogen adsorption specific surface area is greater than 0 m 2 / g, and 65m 2 / g or less.
3. The carbon black as claimed in claim 2, wherein the nitrogen adsorption specific surface area is greater than 0 m 2 / g, and 36m 2 / g or less.
4. The carbon black as claimed in claim 3, wherein the nitrogen adsorption specific surface area is greater than 0 m 2 / g, and 32m 2 / g or less.
5. The carbon black as claimed in claim 1, wherein the oil absorption value is greater than 0cc / 100g and is less than 92cc / 100g.
6. The carbon black as claimed in claim 5, wherein the oil absorption value is greater than 0cc / 100g and is less than 80cc / 100g.
7. The carbon black according to claim 1, further satisfying the following condition (c), (c) The primary particle size is 45 to 70 nanometers.
8. The carbon black as claimed in claim 7, wherein the primary particle size is 50 to 70 nanometers.
9. The carbon black according to claim 1, further satisfying the following condition (d), (d) The particle size of the aggregates is 120 to 550 nanometers.
10. The carbon black as claimed in claim 9, wherein the particle size of the aggregate is 120 to 400 nanometers.
11. The carbon black according to claim 1, further satisfying the following condition (e), (e) The volatile matter content is 1 wt% to 5 wt%.
12. The carbon black according to claim 1, further satisfying the following condition (f), (f) The resistivity is 0.020Ω*cm or more.
13. A sealant comprising: a resin; a hardener; and the carbon black according to any one of claims 1 to 12.
14. The sealant of claim 13, further comprising a defoaming agent. The sealant according to claim 13 , which is an electronic potting sealant.
16. Use of the carbon black as claimed in claim 1 for sealant.
17. The use according to claim 16, wherein the sealant is an electronic potting glue.