CN112706500A - Method for improving strength of auro-mica plate - Google Patents
Method for improving strength of auro-mica plate Download PDFInfo
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- CN112706500A CN112706500A CN202011586116.XA CN202011586116A CN112706500A CN 112706500 A CN112706500 A CN 112706500A CN 202011586116 A CN202011586116 A CN 202011586116A CN 112706500 A CN112706500 A CN 112706500A
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- 239000010445 mica Substances 0.000 title claims abstract description 31
- 229910052618 mica group Inorganic materials 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 23
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims abstract description 53
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000003292 glue Substances 0.000 claims abstract description 18
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 15
- 239000010703 silicon Substances 0.000 claims abstract description 15
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 230000014759 maintenance of location Effects 0.000 claims description 24
- 229910052628 phlogopite Inorganic materials 0.000 claims description 13
- 238000005520 cutting process Methods 0.000 claims description 8
- 239000004744 fabric Substances 0.000 claims description 6
- 239000003365 glass fiber Substances 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 abstract description 5
- 239000004594 Masterbatch (MB) Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 abstract description 2
- 239000010931 gold Substances 0.000 abstract description 2
- 229910052737 gold Inorganic materials 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000005452 bending Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 239000000741 silica gel Substances 0.000 description 6
- 229910002027 silica gel Inorganic materials 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000009835 boiling Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/16—Drying; Softening; Cleaning
- B32B38/164—Drying
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
- C09J183/04—Polysiloxanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
Abstract
The invention belongs to the field of mica plate preparation, and provides a method for improving the strength of a gold mica plate, wherein a cloud master batch and organic silicon glue are used as main materials for preparation, and residual toluene and methanol in gummed paper are completely volatilized by controlling the temperature, pressure, exhaust frequency and other processes in the pressing process, so that the raw gum and the mica paper are completely cured, and the good strength of a finished product is ensured; the prepared mica plate has excellent temperature resistance level, high strength performance, good processing performance and good use performance.
Description
Technical Field
The invention belongs to the field of mica plate preparation, and particularly relates to a method for improving the strength of a phlogopite plate.
Background
The phlogopite is mainly formed by combining mica paper and organic silicon resin, along with the high-speed development of electric appliance products, the requirements on temperature resistance level, voltage resistance level and strength are higher and higher, but the strength of the conventional phlogopite cannot exceed 180N/mm, and the conventional phlogopite is obviously not suitable for the development requirements of high-end electric appliance products. At present, a method for improving the strength of the phlogopite is needed to meet the use requirement of the product.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for improving the strength of a phlogopite, wherein the mica plate prepared by using the cloud master batch and the organic silicon glue as main materials has excellent temperature resistance level and high strength performance and also has good processability and usability.
The purpose of the invention is realized by the following technical scheme.
A method for improving the strength of a phlogopite plate comprises the following steps:
(1) the organic silicon glue is uniformly permeated into the mica paper by applying glue;
(2) baking the volatilized toluene and methanol in the gummed paper to ensure that the gummed mica paper is dry and the raw glue is uniformly permeated;
(3) cutting the gummed paper, checking whether the gummed paper contains impurities in the paper cutting process, and removing the gummed paper with the impurities to ensure the quality of the gummed paper;
(4) calculating the density to obtain the weight of the counterweight, stacking 7 pieces of glass fiber cloth on the bottom plate during stacking, stacking according to each blank plate, and stacking one piece of glass fiber cloth on each blank plate during stacking;
(5) in the pressing process, residual toluene and methanol in the gummed paper are completely volatilized at the high temperature of 50-280 ℃ and the high pressure of 0.5-15Mpa, so that the crude gum and the mica paper are completely cured, and the good strength of a finished product is ensured; the specific technological parameters of the pressing process are as follows
Section 1, initial temperature: 0 ℃, termination temperature: 120 ℃, pressure: 0.5-15Mpa, retention time: 10-30min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 2, initial temperature: 120 ℃, termination temperature: 160 ℃, pressure magnitude: 0.5-15Mpa, retention time: 10-30min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 3, initial temperature: 160 ℃, termination temperature: 180 ℃, pressure: 0.5-15Mpa, retention time: 10-30min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 4, initial temperature: 180 ℃, termination temperature: 200 ℃, pressure: 0.5-15Mpa, retention time: 10-30min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 5, initial temperature: 200 ℃, termination temperature: 220 ℃, pressure: 0.5-15Mpa, retention time: 10-30min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 6, initial temperature: 220 ℃, termination temperature: 240 ℃, pressure magnitude: 0.5-15Mpa, retention time: 10-30min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 7, initial temperature: 240 ℃, termination temperature: 260 ℃, pressure magnitude: 0.5-15Mpa, retention time: 30-50min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 8, initial temperature: 260 ℃, termination temperature: 280 ℃, pressure: 0.5-15Mpa, retention time: 30-50min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 9, initial temperature: 260 ℃, termination temperature: 280 ℃, pressure: 0.5-15Mpa, retention time: 30-50min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 10, initial temperature: 260 ℃, termination temperature: 280 ℃, pressure: 15Mpa, retention time: 2-4h, exhaust frequency: 1, reduced pressure type: contact pressure;
section 11, initial temperature: and (6) naturally cooling at 280 ℃, and stopping temperature: 150 ℃, pressure: 15Mpa, retention time: 0.5-1h, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 12, initial temperature: forced cooling at 150 ℃, termination temperature: 60 ℃, pressure: 15Mpa, retention time: v, number of air exhausts: 1, reduced pressure type: and (7) contact pressure.
In the technical scheme, the organic silicon glue in the step (1) comprises organic silicon resin virgin glue, toluene and methanol.
The preparation method of the organic silicon glue specifically comprises the following steps:
s1, hydrolyzing one or more monohydroxyorganosiloxanes M or organosilicon chlorides which can be hydrolyzed to form monohydroxyorganosiloxanes and one or more not less than trihydroxyorganosiloxane or organopolysiloxane T, Q or not less than trihydroxyorganosiloxane or organopolysiloxane in a water bath under the action of a catalyst; heating and refluxing for a period of time, and then evaporating to remove byproducts; neutralizing to neutrality, adding toluene as solvent, and regulating solid content to obtain crude rubber;
s2, adding the synthesized organic silicon resin crude rubber into a reaction kettle, preparing the concentration according to a certain proportion, adding a solvent toluene, a coupling agent, a catalyst and methanol into the reaction kettle, stirring uniformly, adjusting the gelling time and the solid content, and synthesizing the mica plate by using the organic silicon glue.
In the technical scheme, the baking oven is used for baking in the step (2), the toluene and the methanol in the organic silica gel water are primarily volatilized at the temperature of 20-60 ℃ at the front section of the baking oven, the toluene and the methanol in the organic silica gel water are further volatilized at the temperature of 60-100 ℃ at the middle section of the baking oven, and the residual toluene and the methanol in the organic silica gel water are volatilized at the temperature of 100-140 ℃ at the tail section of the baking oven.
According to the method for improving the strength of the phlogopite, the cloud master batch and the organic silicon glue are used as main materials for preparation, and the prepared mica plate has excellent temperature resistance level and high strength performance and also has good processability and usability.
Detailed Description
The present invention is further described in detail below with reference to examples, so that those skilled in the art can implement the invention with reference to the description.
The invention provides a method for improving the strength of a phlogopite plate, which comprises the following steps:
(1) the organic silicon glue (organic silicon resin crude glue, methylbenzene and methanol) is uniformly permeated into the mica paper by gluing, and the mica paper is the gold mica paper;
(2) the method comprises the steps of roasting and volatilizing partial toluene and methanol in the gummed paper, primarily volatilizing the toluene and the methanol in the organic silica gel water at the temperature of 20-60 ℃ at the front section of an oven, further volatilizing the toluene and the methanol in the organic silica gel water at the temperature of 60-100 ℃ at the middle section of the oven, and volatilizing the residual toluene and the methanol in the organic silica gel water at the temperature of 100-140 ℃ at the tail section of the oven, so that the gummed mica paper is dry and the raw glue is uniformly permeated;
(3) cutting the gummed paper, checking whether the gummed paper contains impurities in the paper cutting process, and removing the gummed paper with the impurities to ensure the quality of the gummed paper;
(4) calculating the density to obtain the weight of the counterweight, stacking 7 pieces of glass fiber cloth on the bottom plate during stacking, stacking according to each blank plate, and stacking one piece of glass fiber cloth on each blank plate during stacking;
(5) in the pressing process, residual toluene and methanol in the gummed paper are completely volatilized at the high temperature of 50-280 ℃ and the high pressure of 0.5-15Mpa, so that the crude gum and the mica paper are completely cured, and the good strength of a finished product is ensured; the specific process parameters of the pressing process are as follows
Finished product test results (mica plate performance):
1. the tolerance of the length and the width is within +/-1mm, and the parallelism of the length and the width is less than or equal to 1;
2. water absorption, respectively taking 50 × 50mm samples from the periphery and the middle of the mica plate, weighing the samples according to the respective weights M1, soaking the samples in cold water (the temperature is 24 +/-2 ℃) for 12 hours, taking out the samples, wiping off water stains on the surfaces by using filter paper, and weighing the samples according to the respective weights M2; (four digits after reading to decimal point accuracy), the calculation is: h ═ 100% of (M2-M1)/M1, test result < 1.5%;
3. machining performance, namely cutting a sample into small strips with the length of 200mm and the width of 10mm by using a plate shearing machine, and visually observing whether the layering phenomenon exists or not;
4. moisture resistance, cutting a sample into 200 x 300mm, vertically immersing the sample in normal temperature water, standing for 24 hours, taking out the sample, bending four corners by hands, observing whether a soft corner layer phenomenon exists or not, and detecting whether a soft corner layering phenomenon exists or not;
5. bending strength
5.1 normality detection: sampling 25 × 25mm at least 5 mica plates, placing the samples in a tensile machine to test the bending resistance load, wherein the constant speed is 200mm/min, namely the load (taking an average value), and the test result shows that the normal bending resistance strength is more than or equal to 140N/mm;
5.2 boiling detection: sampling 25 x 25mm at least 5 mica plates, putting the mica plates into boiling water for boiling for 30 minutes, taking the mica plates out, putting the mica plates into a tensile machine for testing the bending resistance load, wherein the constant speed is 200mm/min, namely the load (taking an average value), and the boiling bending resistance strength of the test result is more than or equal to 40N/mm;
6. burning performance, taking 150 × 150mm samples in the middle of the mica plate; electrifying a 1000W and 220V electric furnace for 3 minutes, placing a mica plate sample on the electric furnace, burning for 5 minutes, observing and smelling the smoke, the taste and the foaming condition, and detecting that the result is smokeless and non-foaming;
7. and (3) breakdown strength, slowly rotating a voltage regulating switch along a clock, gradually increasing the output measurement voltage until the buzzer buzzes, immediately reading and recording the reading of the display, wherein the detection result is more than 20 kV/mm.
From the detection results, the high-strength phlogopite board prepared by the method has the characteristics of high temperature resistance, moisture absorption resistance and high strength.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (3)
1. A method for improving the strength of a phlogopite plate is characterized by comprising the following steps:
(1) the organic silicon glue is uniformly permeated into the mica paper by applying glue;
(2) baking the volatilized toluene and methanol in the gummed paper to ensure that the gummed mica paper is dry and the raw glue is uniformly permeated;
(3) cutting the gummed paper, checking whether the gummed paper contains impurities in the paper cutting process, and removing the gummed paper with the impurities to ensure the quality of the gummed paper;
(4) calculating the density to obtain the weight of the counterweight, stacking 7 pieces of glass fiber cloth on the bottom plate during stacking, stacking according to each blank plate, and stacking one piece of glass fiber cloth on each blank plate during stacking;
(5) in the pressing process, residual toluene and methanol in the gummed paper are completely volatilized at the high temperature of 50-280 ℃ and the high pressure of 0.5-15Mpa, so that the crude gum and the mica paper are completely cured, and the good strength of a finished product is ensured; the specific technological parameters of the pressing process are as follows
Section 1, initial temperature: 0 ℃, termination temperature: 120 ℃, pressure: 0.5-15Mpa, retention time: 10-30min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 2, initial temperature: 120 ℃, termination temperature: 160 ℃, pressure magnitude: 0.5-15Mpa, retention time: 10-30min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 3, initial temperature: 160 ℃, termination temperature: 180 ℃, pressure: 0.5-15Mpa, retention time: 10-30min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 4, initial temperature: 180 ℃, termination temperature: 200 ℃, pressure: 0.5-15Mpa, retention time: 10-30min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 5, initial temperature: 200 ℃, termination temperature: 220 ℃, pressure: 0.5-15Mpa, retention time: 10-30min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 6, initial temperature: 220 ℃, termination temperature: 240 ℃, pressure magnitude: 0.5-15Mpa, retention time: 10-30min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 7, initial temperature: 240 ℃, termination temperature: 260 ℃, pressure magnitude: 0.5-15Mpa, retention time: 30-50min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 8, initial temperature: 260 ℃, termination temperature: 280 ℃, pressure: 0.5-15Mpa, retention time: 30-50min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 9, initial temperature: 260 ℃, termination temperature: 280 ℃, pressure: 0.5-15Mpa, retention time: 30-50min, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 10, initial temperature: 260 ℃, termination temperature: 280 ℃, pressure: 15Mpa, retention time: 2-4h, exhaust frequency: 1, reduced pressure type: contact pressure;
section 11, initial temperature: and (6) naturally cooling at 280 ℃, and stopping temperature: 150 ℃, pressure: 15Mpa, retention time: 0.5-1h, air exhaust frequency: 1, reduced pressure type: contact pressure;
section 12, initial temperature: forced cooling at 150 ℃, termination temperature: 60 ℃, pressure: 15Mpa, retention time: v, number of air exhausts: 1, reduced pressure type: and (7) contact pressure.
2. The method for improving the strength of the phlogopite plate according to claim 1, wherein: the organic silicon glue in the step (1) comprises organic silicon resin virgin glue, toluene and methanol.
3. The method for improving the strength of the phlogopite plate according to claim 1, wherein: and (2) baking by using an oven, wherein the temperature of the front section of the oven is 20-60 ℃, the temperature of the middle section of the oven is 60-100 ℃, and the temperature of the tail section of the oven is 100-.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011586116.XA CN112706500A (en) | 2020-12-29 | 2020-12-29 | Method for improving strength of auro-mica plate |
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| CN202011586116.XA CN112706500A (en) | 2020-12-29 | 2020-12-29 | Method for improving strength of auro-mica plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114267503A (en) * | 2021-12-01 | 2022-04-01 | 湖北平安电工科技股份公司 | Preparation method of glass fiber cloth sandwiched epoxy board |
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| CN114267503A (en) * | 2021-12-01 | 2022-04-01 | 湖北平安电工科技股份公司 | Preparation method of glass fiber cloth sandwiched epoxy board |
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